Commit | Line | Data |
---|---|---|
d2876d08 DB |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
ff77c352 | 3 | #include <linux/interrupt.h> |
d2876d08 DB |
4 | #include <linux/irq.h> |
5 | #include <linux/spinlock.h> | |
1a989d0f | 6 | #include <linux/list.h> |
d8f388d8 DB |
7 | #include <linux/device.h> |
8 | #include <linux/err.h> | |
9 | #include <linux/debugfs.h> | |
10 | #include <linux/seq_file.h> | |
11 | #include <linux/gpio.h> | |
391c970c | 12 | #include <linux/of_gpio.h> |
ff77c352 | 13 | #include <linux/idr.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
7b199811 | 15 | #include <linux/acpi.h> |
53e7cac3 | 16 | #include <linux/gpio/driver.h> |
0a6d3158 | 17 | #include <linux/gpio/machine.h> |
c771c2f4 | 18 | #include <linux/pinctrl/consumer.h> |
3c702e99 LW |
19 | #include <linux/cdev.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/uaccess.h> | |
8b92e17e | 22 | #include <linux/compat.h> |
d7c51b47 | 23 | #include <linux/anon_inodes.h> |
61f922db LW |
24 | #include <linux/kfifo.h> |
25 | #include <linux/poll.h> | |
26 | #include <linux/timekeeping.h> | |
3c702e99 | 27 | #include <uapi/linux/gpio.h> |
d2876d08 | 28 | |
664e3e5a MW |
29 | #include "gpiolib.h" |
30 | ||
3f397c21 UKK |
31 | #define CREATE_TRACE_POINTS |
32 | #include <trace/events/gpio.h> | |
d2876d08 | 33 | |
79a9becd | 34 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 35 | * |
79a9becd AC |
36 | * The GPIO programming interface allows for inlining speed-critical |
37 | * get/set operations for common cases, so that access to SOC-integrated | |
38 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
39 | */ |
40 | ||
41 | ||
42 | /* When debugging, extend minimal trust to callers and platform code. | |
43 | * Also emit diagnostic messages that may help initial bringup, when | |
44 | * board setup or driver bugs are most common. | |
45 | * | |
46 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
47 | */ | |
48 | #ifdef DEBUG | |
49 | #define extra_checks 1 | |
50 | #else | |
51 | #define extra_checks 0 | |
52 | #endif | |
53 | ||
ff2b1359 LW |
54 | /* Device and char device-related information */ |
55 | static DEFINE_IDA(gpio_ida); | |
3c702e99 LW |
56 | static dev_t gpio_devt; |
57 | #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ | |
58 | static struct bus_type gpio_bus_type = { | |
59 | .name = "gpio", | |
60 | }; | |
ff2b1359 | 61 | |
d2876d08 DB |
62 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
63 | * While any GPIO is requested, its gpio_chip is not removable; | |
64 | * each GPIO's "requested" flag serves as a lock and refcount. | |
65 | */ | |
0eb4c6c2 | 66 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 67 | |
bae48da2 AC |
68 | static DEFINE_MUTEX(gpio_lookup_lock); |
69 | static LIST_HEAD(gpio_lookup_list); | |
ff2b1359 | 70 | LIST_HEAD(gpio_devices); |
6d86750c JH |
71 | |
72 | static void gpiochip_free_hogs(struct gpio_chip *chip); | |
73 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); | |
74 | ||
159f3cd9 | 75 | static bool gpiolib_initialized; |
6d86750c | 76 | |
d2876d08 DB |
77 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
78 | { | |
d2876d08 | 79 | d->label = label; |
d2876d08 DB |
80 | } |
81 | ||
372e722e AC |
82 | /** |
83 | * Convert a GPIO number to its descriptor | |
84 | */ | |
79a9becd | 85 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 86 | { |
ff2b1359 | 87 | struct gpio_device *gdev; |
14e85c0e AC |
88 | unsigned long flags; |
89 | ||
90 | spin_lock_irqsave(&gpio_lock, flags); | |
91 | ||
ff2b1359 | 92 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
93 | if (gdev->base <= gpio && |
94 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 95 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 96 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
97 | } |
98 | } | |
99 | ||
100 | spin_unlock_irqrestore(&gpio_lock, flags); | |
101 | ||
0e9a5edf AC |
102 | if (!gpio_is_valid(gpio)) |
103 | WARN(1, "invalid GPIO %d\n", gpio); | |
104 | ||
14e85c0e | 105 | return NULL; |
372e722e | 106 | } |
79a9becd | 107 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 108 | |
d468bf9e | 109 | /** |
bb1e88cc | 110 | * Get the GPIO descriptor corresponding to the given hw number for this chip. |
d468bf9e | 111 | */ |
bb1e88cc AC |
112 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
113 | u16 hwnum) | |
d468bf9e | 114 | { |
fdeb8e15 LW |
115 | struct gpio_device *gdev = chip->gpiodev; |
116 | ||
117 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 118 | return ERR_PTR(-EINVAL); |
d468bf9e | 119 | |
fdeb8e15 | 120 | return &gdev->descs[hwnum]; |
d468bf9e | 121 | } |
372e722e AC |
122 | |
123 | /** | |
124 | * Convert a GPIO descriptor to the integer namespace. | |
125 | * This should disappear in the future but is needed since we still | |
126 | * use GPIO numbers for error messages and sysfs nodes | |
127 | */ | |
79a9becd | 128 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 129 | { |
fdeb8e15 | 130 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 131 | } |
79a9becd | 132 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
133 | |
134 | ||
79a9becd AC |
135 | /** |
136 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
137 | * @desc: descriptor to return the chip of | |
138 | */ | |
139 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 140 | { |
fdeb8e15 LW |
141 | if (!desc || !desc->gdev || !desc->gdev->chip) |
142 | return NULL; | |
143 | return desc->gdev->chip; | |
372e722e | 144 | } |
79a9becd | 145 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 146 | |
8d0aab2f AV |
147 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
148 | static int gpiochip_find_base(int ngpio) | |
149 | { | |
ff2b1359 | 150 | struct gpio_device *gdev; |
83cabe33 | 151 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 152 | |
ff2b1359 | 153 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 154 | /* found a free space? */ |
fdeb8e15 | 155 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
156 | break; |
157 | else | |
158 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 159 | base = gdev->base - ngpio; |
8d0aab2f AV |
160 | } |
161 | ||
83cabe33 | 162 | if (gpio_is_valid(base)) { |
8d0aab2f | 163 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
164 | return base; |
165 | } else { | |
166 | pr_err("%s: cannot find free range\n", __func__); | |
167 | return -ENOSPC; | |
169b6a7a | 168 | } |
169b6a7a AV |
169 | } |
170 | ||
79a9becd AC |
171 | /** |
172 | * gpiod_get_direction - return the current direction of a GPIO | |
173 | * @desc: GPIO to get the direction of | |
174 | * | |
175 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
176 | * | |
177 | * This function may sleep if gpiod_cansleep() is true. | |
178 | */ | |
8e53b0f1 | 179 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
180 | { |
181 | struct gpio_chip *chip; | |
372e722e | 182 | unsigned offset; |
80b0a602 MN |
183 | int status = -EINVAL; |
184 | ||
372e722e AC |
185 | chip = gpiod_to_chip(desc); |
186 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
187 | |
188 | if (!chip->get_direction) | |
189 | return status; | |
190 | ||
372e722e | 191 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
192 | if (status > 0) { |
193 | /* GPIOF_DIR_IN, or other positive */ | |
194 | status = 1; | |
8e53b0f1 | 195 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
196 | } |
197 | if (status == 0) { | |
198 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 199 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
200 | } |
201 | return status; | |
202 | } | |
79a9becd | 203 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 204 | |
1a989d0f AC |
205 | /* |
206 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 207 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
208 | * |
209 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
210 | * space. | |
211 | */ | |
ff2b1359 | 212 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 213 | { |
a961f9b4 | 214 | struct gpio_device *prev, *next; |
1a989d0f | 215 | |
ff2b1359 | 216 | if (list_empty(&gpio_devices)) { |
a961f9b4 | 217 | /* initial entry in list */ |
ff2b1359 | 218 | list_add_tail(&gdev->list, &gpio_devices); |
e28ecca6 | 219 | return 0; |
1a989d0f AC |
220 | } |
221 | ||
a961f9b4 BJZ |
222 | next = list_entry(gpio_devices.next, struct gpio_device, list); |
223 | if (gdev->base + gdev->ngpio <= next->base) { | |
224 | /* add before first entry */ | |
225 | list_add(&gdev->list, &gpio_devices); | |
226 | return 0; | |
1a989d0f AC |
227 | } |
228 | ||
a961f9b4 BJZ |
229 | prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
230 | if (prev->base + prev->ngpio <= gdev->base) { | |
231 | /* add behind last entry */ | |
232 | list_add_tail(&gdev->list, &gpio_devices); | |
96098df1 | 233 | return 0; |
1a989d0f AC |
234 | } |
235 | ||
a961f9b4 BJZ |
236 | list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
237 | /* at the end of the list */ | |
238 | if (&next->list == &gpio_devices) | |
239 | break; | |
1a989d0f | 240 | |
a961f9b4 BJZ |
241 | /* add between prev and next */ |
242 | if (prev->base + prev->ngpio <= gdev->base | |
243 | && gdev->base + gdev->ngpio <= next->base) { | |
244 | list_add(&gdev->list, &prev->list); | |
245 | return 0; | |
246 | } | |
247 | } | |
248 | ||
249 | dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); | |
250 | return -EBUSY; | |
1a989d0f AC |
251 | } |
252 | ||
f881bab0 LW |
253 | /** |
254 | * Convert a GPIO name to its descriptor | |
255 | */ | |
256 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
257 | { | |
ff2b1359 | 258 | struct gpio_device *gdev; |
f881bab0 LW |
259 | unsigned long flags; |
260 | ||
261 | spin_lock_irqsave(&gpio_lock, flags); | |
262 | ||
ff2b1359 | 263 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
264 | int i; |
265 | ||
fdeb8e15 LW |
266 | for (i = 0; i != gdev->ngpio; ++i) { |
267 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 268 | |
fdeb8e15 | 269 | if (!desc->name || !name) |
f881bab0 LW |
270 | continue; |
271 | ||
fdeb8e15 | 272 | if (!strcmp(desc->name, name)) { |
f881bab0 | 273 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 274 | return desc; |
f881bab0 LW |
275 | } |
276 | } | |
277 | } | |
278 | ||
279 | spin_unlock_irqrestore(&gpio_lock, flags); | |
280 | ||
281 | return NULL; | |
282 | } | |
283 | ||
5f3ca732 MP |
284 | /* |
285 | * Takes the names from gc->names and checks if they are all unique. If they | |
286 | * are, they are assigned to their gpio descriptors. | |
287 | * | |
ed37915c | 288 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
289 | */ |
290 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
291 | { | |
fdeb8e15 | 292 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
293 | int i; |
294 | ||
295 | if (!gc->names) | |
296 | return 0; | |
297 | ||
298 | /* First check all names if they are unique */ | |
299 | for (i = 0; i != gc->ngpio; ++i) { | |
300 | struct gpio_desc *gpio; | |
301 | ||
302 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 303 | if (gpio) |
fdeb8e15 | 304 | dev_warn(&gdev->dev, |
34ffd85d | 305 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 306 | gc->names[i]); |
5f3ca732 MP |
307 | } |
308 | ||
309 | /* Then add all names to the GPIO descriptors */ | |
310 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 311 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
312 | |
313 | return 0; | |
314 | } | |
315 | ||
d7c51b47 LW |
316 | /* |
317 | * GPIO line handle management | |
318 | */ | |
319 | ||
320 | /** | |
321 | * struct linehandle_state - contains the state of a userspace handle | |
322 | * @gdev: the GPIO device the handle pertains to | |
323 | * @label: consumer label used to tag descriptors | |
324 | * @descs: the GPIO descriptors held by this handle | |
325 | * @numdescs: the number of descriptors held in the descs array | |
326 | */ | |
327 | struct linehandle_state { | |
328 | struct gpio_device *gdev; | |
329 | const char *label; | |
330 | struct gpio_desc *descs[GPIOHANDLES_MAX]; | |
331 | u32 numdescs; | |
332 | }; | |
333 | ||
334 | static long linehandle_ioctl(struct file *filep, unsigned int cmd, | |
335 | unsigned long arg) | |
336 | { | |
337 | struct linehandle_state *lh = filep->private_data; | |
338 | void __user *ip = (void __user *)arg; | |
339 | struct gpiohandle_data ghd; | |
340 | int i; | |
341 | ||
342 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
343 | int val; | |
344 | ||
345 | /* TODO: check if descriptors are really input */ | |
346 | for (i = 0; i < lh->numdescs; i++) { | |
347 | val = gpiod_get_value_cansleep(lh->descs[i]); | |
348 | if (val < 0) | |
349 | return val; | |
350 | ghd.values[i] = val; | |
351 | } | |
352 | ||
353 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
354 | return -EFAULT; | |
355 | ||
356 | return 0; | |
357 | } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) { | |
358 | int vals[GPIOHANDLES_MAX]; | |
359 | ||
360 | /* TODO: check if descriptors are really output */ | |
361 | if (copy_from_user(&ghd, ip, sizeof(ghd))) | |
362 | return -EFAULT; | |
363 | ||
364 | /* Clamp all values to [0,1] */ | |
365 | for (i = 0; i < lh->numdescs; i++) | |
366 | vals[i] = !!ghd.values[i]; | |
367 | ||
368 | /* Reuse the array setting function */ | |
369 | gpiod_set_array_value_complex(false, | |
370 | true, | |
371 | lh->numdescs, | |
372 | lh->descs, | |
373 | vals); | |
374 | return 0; | |
375 | } | |
376 | return -EINVAL; | |
377 | } | |
378 | ||
379 | #ifdef CONFIG_COMPAT | |
380 | static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd, | |
381 | unsigned long arg) | |
382 | { | |
383 | return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
384 | } | |
385 | #endif | |
386 | ||
387 | static int linehandle_release(struct inode *inode, struct file *filep) | |
388 | { | |
389 | struct linehandle_state *lh = filep->private_data; | |
390 | struct gpio_device *gdev = lh->gdev; | |
391 | int i; | |
392 | ||
393 | for (i = 0; i < lh->numdescs; i++) | |
394 | gpiod_free(lh->descs[i]); | |
395 | kfree(lh->label); | |
396 | kfree(lh); | |
397 | put_device(&gdev->dev); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | static const struct file_operations linehandle_fileops = { | |
402 | .release = linehandle_release, | |
403 | .owner = THIS_MODULE, | |
404 | .llseek = noop_llseek, | |
405 | .unlocked_ioctl = linehandle_ioctl, | |
406 | #ifdef CONFIG_COMPAT | |
407 | .compat_ioctl = linehandle_ioctl_compat, | |
408 | #endif | |
409 | }; | |
410 | ||
411 | static int linehandle_create(struct gpio_device *gdev, void __user *ip) | |
412 | { | |
413 | struct gpiohandle_request handlereq; | |
414 | struct linehandle_state *lh; | |
415 | int fd, i, ret; | |
416 | ||
417 | if (copy_from_user(&handlereq, ip, sizeof(handlereq))) | |
418 | return -EFAULT; | |
419 | if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX)) | |
420 | return -EINVAL; | |
421 | ||
422 | lh = kzalloc(sizeof(*lh), GFP_KERNEL); | |
423 | if (!lh) | |
424 | return -ENOMEM; | |
425 | lh->gdev = gdev; | |
426 | get_device(&gdev->dev); | |
427 | ||
428 | /* Make sure this is terminated */ | |
429 | handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0'; | |
430 | if (strlen(handlereq.consumer_label)) { | |
431 | lh->label = kstrdup(handlereq.consumer_label, | |
432 | GFP_KERNEL); | |
433 | if (!lh->label) { | |
434 | ret = -ENOMEM; | |
435 | goto out_free_lh; | |
436 | } | |
437 | } | |
438 | ||
439 | /* Request each GPIO */ | |
440 | for (i = 0; i < handlereq.lines; i++) { | |
441 | u32 offset = handlereq.lineoffsets[i]; | |
442 | u32 lflags = handlereq.flags; | |
443 | struct gpio_desc *desc; | |
444 | ||
445 | desc = &gdev->descs[offset]; | |
446 | ret = gpiod_request(desc, lh->label); | |
447 | if (ret) | |
448 | goto out_free_descs; | |
449 | lh->descs[i] = desc; | |
450 | ||
451 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
452 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
453 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
454 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
455 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
456 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
457 | ||
458 | /* | |
459 | * Lines have to be requested explicitly for input | |
460 | * or output, else the line will be treated "as is". | |
461 | */ | |
462 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
463 | int val = !!handlereq.default_values[i]; | |
464 | ||
465 | ret = gpiod_direction_output(desc, val); | |
466 | if (ret) | |
467 | goto out_free_descs; | |
468 | } else if (lflags & GPIOHANDLE_REQUEST_INPUT) { | |
469 | ret = gpiod_direction_input(desc); | |
470 | if (ret) | |
471 | goto out_free_descs; | |
472 | } | |
473 | dev_dbg(&gdev->dev, "registered chardev handle for line %d\n", | |
474 | offset); | |
475 | } | |
e2f608be LW |
476 | /* Let i point at the last handle */ |
477 | i--; | |
d7c51b47 LW |
478 | lh->numdescs = handlereq.lines; |
479 | ||
480 | fd = anon_inode_getfd("gpio-linehandle", | |
481 | &linehandle_fileops, | |
482 | lh, | |
483 | O_RDONLY | O_CLOEXEC); | |
484 | if (fd < 0) { | |
485 | ret = fd; | |
486 | goto out_free_descs; | |
487 | } | |
488 | ||
489 | handlereq.fd = fd; | |
d932cd49 LW |
490 | if (copy_to_user(ip, &handlereq, sizeof(handlereq))) { |
491 | ret = -EFAULT; | |
492 | goto out_free_descs; | |
493 | } | |
d7c51b47 LW |
494 | |
495 | dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n", | |
496 | lh->numdescs); | |
497 | ||
498 | return 0; | |
499 | ||
500 | out_free_descs: | |
501 | for (; i >= 0; i--) | |
502 | gpiod_free(lh->descs[i]); | |
503 | kfree(lh->label); | |
504 | out_free_lh: | |
505 | kfree(lh); | |
506 | put_device(&gdev->dev); | |
507 | return ret; | |
508 | } | |
509 | ||
61f922db LW |
510 | /* |
511 | * GPIO line event management | |
512 | */ | |
513 | ||
514 | /** | |
515 | * struct lineevent_state - contains the state of a userspace event | |
516 | * @gdev: the GPIO device the event pertains to | |
517 | * @label: consumer label used to tag descriptors | |
518 | * @desc: the GPIO descriptor held by this event | |
519 | * @eflags: the event flags this line was requested with | |
520 | * @irq: the interrupt that trigger in response to events on this GPIO | |
521 | * @wait: wait queue that handles blocking reads of events | |
522 | * @events: KFIFO for the GPIO events | |
523 | * @read_lock: mutex lock to protect reads from colliding with adding | |
524 | * new events to the FIFO | |
525 | */ | |
526 | struct lineevent_state { | |
527 | struct gpio_device *gdev; | |
528 | const char *label; | |
529 | struct gpio_desc *desc; | |
530 | u32 eflags; | |
531 | int irq; | |
532 | wait_queue_head_t wait; | |
533 | DECLARE_KFIFO(events, struct gpioevent_data, 16); | |
534 | struct mutex read_lock; | |
535 | }; | |
536 | ||
537 | static unsigned int lineevent_poll(struct file *filep, | |
538 | struct poll_table_struct *wait) | |
539 | { | |
540 | struct lineevent_state *le = filep->private_data; | |
541 | unsigned int events = 0; | |
542 | ||
543 | poll_wait(filep, &le->wait, wait); | |
544 | ||
545 | if (!kfifo_is_empty(&le->events)) | |
546 | events = POLLIN | POLLRDNORM; | |
547 | ||
548 | return events; | |
549 | } | |
550 | ||
551 | ||
552 | static ssize_t lineevent_read(struct file *filep, | |
553 | char __user *buf, | |
554 | size_t count, | |
555 | loff_t *f_ps) | |
556 | { | |
557 | struct lineevent_state *le = filep->private_data; | |
558 | unsigned int copied; | |
559 | int ret; | |
560 | ||
561 | if (count < sizeof(struct gpioevent_data)) | |
562 | return -EINVAL; | |
563 | ||
564 | do { | |
565 | if (kfifo_is_empty(&le->events)) { | |
566 | if (filep->f_flags & O_NONBLOCK) | |
567 | return -EAGAIN; | |
568 | ||
569 | ret = wait_event_interruptible(le->wait, | |
570 | !kfifo_is_empty(&le->events)); | |
571 | if (ret) | |
572 | return ret; | |
573 | } | |
574 | ||
575 | if (mutex_lock_interruptible(&le->read_lock)) | |
576 | return -ERESTARTSYS; | |
577 | ret = kfifo_to_user(&le->events, buf, count, &copied); | |
578 | mutex_unlock(&le->read_lock); | |
579 | ||
580 | if (ret) | |
581 | return ret; | |
582 | ||
583 | /* | |
584 | * If we couldn't read anything from the fifo (a different | |
585 | * thread might have been faster) we either return -EAGAIN if | |
586 | * the file descriptor is non-blocking, otherwise we go back to | |
587 | * sleep and wait for more data to arrive. | |
588 | */ | |
589 | if (copied == 0 && (filep->f_flags & O_NONBLOCK)) | |
590 | return -EAGAIN; | |
591 | ||
592 | } while (copied == 0); | |
593 | ||
594 | return copied; | |
595 | } | |
596 | ||
597 | static int lineevent_release(struct inode *inode, struct file *filep) | |
598 | { | |
599 | struct lineevent_state *le = filep->private_data; | |
600 | struct gpio_device *gdev = le->gdev; | |
601 | ||
602 | free_irq(le->irq, le); | |
603 | gpiod_free(le->desc); | |
604 | kfree(le->label); | |
605 | kfree(le); | |
606 | put_device(&gdev->dev); | |
607 | return 0; | |
608 | } | |
609 | ||
610 | static long lineevent_ioctl(struct file *filep, unsigned int cmd, | |
611 | unsigned long arg) | |
612 | { | |
613 | struct lineevent_state *le = filep->private_data; | |
614 | void __user *ip = (void __user *)arg; | |
615 | struct gpiohandle_data ghd; | |
616 | ||
617 | /* | |
618 | * We can get the value for an event line but not set it, | |
619 | * because it is input by definition. | |
620 | */ | |
621 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
622 | int val; | |
623 | ||
624 | val = gpiod_get_value_cansleep(le->desc); | |
625 | if (val < 0) | |
626 | return val; | |
627 | ghd.values[0] = val; | |
628 | ||
629 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
630 | return -EFAULT; | |
631 | ||
632 | return 0; | |
633 | } | |
634 | return -EINVAL; | |
635 | } | |
636 | ||
637 | #ifdef CONFIG_COMPAT | |
638 | static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd, | |
639 | unsigned long arg) | |
640 | { | |
641 | return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
642 | } | |
643 | #endif | |
644 | ||
645 | static const struct file_operations lineevent_fileops = { | |
646 | .release = lineevent_release, | |
647 | .read = lineevent_read, | |
648 | .poll = lineevent_poll, | |
649 | .owner = THIS_MODULE, | |
650 | .llseek = noop_llseek, | |
651 | .unlocked_ioctl = lineevent_ioctl, | |
652 | #ifdef CONFIG_COMPAT | |
653 | .compat_ioctl = lineevent_ioctl_compat, | |
654 | #endif | |
655 | }; | |
656 | ||
33265b17 | 657 | static irqreturn_t lineevent_irq_thread(int irq, void *p) |
61f922db LW |
658 | { |
659 | struct lineevent_state *le = p; | |
660 | struct gpioevent_data ge; | |
661 | int ret; | |
662 | ||
663 | ge.timestamp = ktime_get_real_ns(); | |
664 | ||
665 | if (le->eflags & GPIOEVENT_REQUEST_BOTH_EDGES) { | |
666 | int level = gpiod_get_value_cansleep(le->desc); | |
667 | ||
668 | if (level) | |
669 | /* Emit low-to-high event */ | |
670 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
671 | else | |
672 | /* Emit high-to-low event */ | |
673 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
674 | } else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE) { | |
675 | /* Emit low-to-high event */ | |
676 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
677 | } else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) { | |
678 | /* Emit high-to-low event */ | |
679 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
bc0207a5 AB |
680 | } else { |
681 | return IRQ_NONE; | |
61f922db LW |
682 | } |
683 | ||
684 | ret = kfifo_put(&le->events, ge); | |
685 | if (ret != 0) | |
686 | wake_up_poll(&le->wait, POLLIN); | |
687 | ||
688 | return IRQ_HANDLED; | |
689 | } | |
690 | ||
691 | static int lineevent_create(struct gpio_device *gdev, void __user *ip) | |
692 | { | |
693 | struct gpioevent_request eventreq; | |
694 | struct lineevent_state *le; | |
695 | struct gpio_desc *desc; | |
696 | u32 offset; | |
697 | u32 lflags; | |
698 | u32 eflags; | |
699 | int fd; | |
700 | int ret; | |
701 | int irqflags = 0; | |
702 | ||
703 | if (copy_from_user(&eventreq, ip, sizeof(eventreq))) | |
704 | return -EFAULT; | |
705 | ||
706 | le = kzalloc(sizeof(*le), GFP_KERNEL); | |
707 | if (!le) | |
708 | return -ENOMEM; | |
709 | le->gdev = gdev; | |
710 | get_device(&gdev->dev); | |
711 | ||
712 | /* Make sure this is terminated */ | |
713 | eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0'; | |
714 | if (strlen(eventreq.consumer_label)) { | |
715 | le->label = kstrdup(eventreq.consumer_label, | |
716 | GFP_KERNEL); | |
717 | if (!le->label) { | |
718 | ret = -ENOMEM; | |
719 | goto out_free_le; | |
720 | } | |
721 | } | |
722 | ||
723 | offset = eventreq.lineoffset; | |
724 | lflags = eventreq.handleflags; | |
725 | eflags = eventreq.eventflags; | |
726 | ||
727 | /* This is just wrong: we don't look for events on output lines */ | |
728 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
729 | ret = -EINVAL; | |
730 | goto out_free_label; | |
731 | } | |
732 | ||
733 | desc = &gdev->descs[offset]; | |
734 | ret = gpiod_request(desc, le->label); | |
735 | if (ret) | |
736 | goto out_free_desc; | |
737 | le->desc = desc; | |
738 | le->eflags = eflags; | |
739 | ||
740 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
741 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
742 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
743 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
744 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
745 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
746 | ||
747 | ret = gpiod_direction_input(desc); | |
748 | if (ret) | |
749 | goto out_free_desc; | |
750 | ||
751 | le->irq = gpiod_to_irq(desc); | |
752 | if (le->irq <= 0) { | |
753 | ret = -ENODEV; | |
754 | goto out_free_desc; | |
755 | } | |
756 | ||
757 | if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) | |
758 | irqflags |= IRQF_TRIGGER_RISING; | |
759 | if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) | |
760 | irqflags |= IRQF_TRIGGER_FALLING; | |
761 | irqflags |= IRQF_ONESHOT; | |
762 | irqflags |= IRQF_SHARED; | |
763 | ||
764 | INIT_KFIFO(le->events); | |
765 | init_waitqueue_head(&le->wait); | |
766 | mutex_init(&le->read_lock); | |
767 | ||
768 | /* Request a thread to read the events */ | |
769 | ret = request_threaded_irq(le->irq, | |
770 | NULL, | |
771 | lineevent_irq_thread, | |
772 | irqflags, | |
773 | le->label, | |
774 | le); | |
775 | if (ret) | |
776 | goto out_free_desc; | |
777 | ||
778 | fd = anon_inode_getfd("gpio-event", | |
779 | &lineevent_fileops, | |
780 | le, | |
781 | O_RDONLY | O_CLOEXEC); | |
782 | if (fd < 0) { | |
783 | ret = fd; | |
784 | goto out_free_irq; | |
785 | } | |
786 | ||
787 | eventreq.fd = fd; | |
d932cd49 LW |
788 | if (copy_to_user(ip, &eventreq, sizeof(eventreq))) { |
789 | ret = -EFAULT; | |
790 | goto out_free_irq; | |
791 | } | |
61f922db LW |
792 | |
793 | return 0; | |
794 | ||
795 | out_free_irq: | |
796 | free_irq(le->irq, le); | |
797 | out_free_desc: | |
798 | gpiod_free(le->desc); | |
799 | out_free_label: | |
800 | kfree(le->label); | |
801 | out_free_le: | |
802 | kfree(le); | |
803 | put_device(&gdev->dev); | |
804 | return ret; | |
805 | } | |
806 | ||
3c702e99 LW |
807 | /** |
808 | * gpio_ioctl() - ioctl handler for the GPIO chardev | |
809 | */ | |
810 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
811 | { | |
812 | struct gpio_device *gdev = filp->private_data; | |
813 | struct gpio_chip *chip = gdev->chip; | |
8b92e17e | 814 | void __user *ip = (void __user *)arg; |
3c702e99 LW |
815 | |
816 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
817 | if (!chip) | |
818 | return -ENODEV; | |
819 | ||
521a2ad6 | 820 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 821 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
822 | struct gpiochip_info chipinfo; |
823 | ||
3c702e99 LW |
824 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
825 | sizeof(chipinfo.name)); | |
826 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
827 | strncpy(chipinfo.label, gdev->label, |
828 | sizeof(chipinfo.label)); | |
829 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 830 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
831 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
832 | return -EFAULT; | |
833 | return 0; | |
521a2ad6 LW |
834 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
835 | struct gpioline_info lineinfo; | |
836 | struct gpio_desc *desc; | |
837 | ||
838 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
839 | return -EFAULT; | |
840 | if (lineinfo.line_offset > gdev->ngpio) | |
841 | return -EINVAL; | |
842 | ||
843 | desc = &gdev->descs[lineinfo.line_offset]; | |
844 | if (desc->name) { | |
845 | strncpy(lineinfo.name, desc->name, | |
846 | sizeof(lineinfo.name)); | |
847 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
848 | } else { | |
849 | lineinfo.name[0] = '\0'; | |
850 | } | |
851 | if (desc->label) { | |
214338e3 LW |
852 | strncpy(lineinfo.consumer, desc->label, |
853 | sizeof(lineinfo.consumer)); | |
854 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 855 | } else { |
214338e3 | 856 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
857 | } |
858 | ||
859 | /* | |
860 | * Userspace only need to know that the kernel is using | |
861 | * this GPIO so it can't use it. | |
862 | */ | |
863 | lineinfo.flags = 0; | |
9d8cc89c LW |
864 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
865 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
866 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
867 | test_bit(FLAG_EXPORT, &desc->flags) || | |
868 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 869 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 870 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 871 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 872 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 873 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 874 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
521a2ad6 | 875 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
9d8cc89c | 876 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
521a2ad6 LW |
877 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
878 | ||
879 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
880 | return -EFAULT; | |
881 | return 0; | |
d7c51b47 LW |
882 | } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { |
883 | return linehandle_create(gdev, ip); | |
61f922db LW |
884 | } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { |
885 | return lineevent_create(gdev, ip); | |
3c702e99 LW |
886 | } |
887 | return -EINVAL; | |
888 | } | |
889 | ||
8b92e17e LW |
890 | #ifdef CONFIG_COMPAT |
891 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, | |
892 | unsigned long arg) | |
893 | { | |
894 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
895 | } | |
896 | #endif | |
897 | ||
3c702e99 LW |
898 | /** |
899 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
900 | * @inode: inode for this chardev | |
901 | * @filp: file struct for storing private data | |
902 | * Returns 0 on success | |
903 | */ | |
904 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
905 | { | |
906 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
907 | struct gpio_device, chrdev); | |
908 | ||
909 | /* Fail on open if the backing gpiochip is gone */ | |
910 | if (!gdev || !gdev->chip) | |
911 | return -ENODEV; | |
912 | get_device(&gdev->dev); | |
913 | filp->private_data = gdev; | |
914 | return 0; | |
915 | } | |
916 | ||
917 | /** | |
918 | * gpio_chrdev_release() - close chardev after ioctl operations | |
919 | * @inode: inode for this chardev | |
920 | * @filp: file struct for storing private data | |
921 | * Returns 0 on success | |
922 | */ | |
923 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
924 | { | |
925 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
926 | struct gpio_device, chrdev); | |
927 | ||
928 | if (!gdev) | |
929 | return -ENODEV; | |
930 | put_device(&gdev->dev); | |
931 | return 0; | |
932 | } | |
933 | ||
934 | ||
935 | static const struct file_operations gpio_fileops = { | |
936 | .release = gpio_chrdev_release, | |
937 | .open = gpio_chrdev_open, | |
938 | .owner = THIS_MODULE, | |
939 | .llseek = noop_llseek, | |
940 | .unlocked_ioctl = gpio_ioctl, | |
8b92e17e LW |
941 | #ifdef CONFIG_COMPAT |
942 | .compat_ioctl = gpio_ioctl_compat, | |
943 | #endif | |
3c702e99 LW |
944 | }; |
945 | ||
ff2b1359 LW |
946 | static void gpiodevice_release(struct device *dev) |
947 | { | |
948 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
949 | ||
950 | list_del(&gdev->list); | |
951 | ida_simple_remove(&gpio_ida, gdev->id); | |
476e2fc5 GR |
952 | kfree(gdev->label); |
953 | kfree(gdev->descs); | |
9efd9e69 | 954 | kfree(gdev); |
ff2b1359 LW |
955 | } |
956 | ||
159f3cd9 GR |
957 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
958 | { | |
959 | int status; | |
960 | ||
961 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
962 | gdev->chrdev.owner = THIS_MODULE; | |
963 | gdev->chrdev.kobj.parent = &gdev->dev.kobj; | |
964 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); | |
965 | status = cdev_add(&gdev->chrdev, gdev->dev.devt, 1); | |
966 | if (status < 0) | |
967 | chip_warn(gdev->chip, "failed to add char device %d:%d\n", | |
968 | MAJOR(gpio_devt), gdev->id); | |
969 | else | |
970 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
971 | MAJOR(gpio_devt), gdev->id); | |
972 | status = device_add(&gdev->dev); | |
973 | if (status) | |
974 | goto err_remove_chardev; | |
975 | ||
976 | status = gpiochip_sysfs_register(gdev); | |
977 | if (status) | |
978 | goto err_remove_device; | |
979 | ||
980 | /* From this point, the .release() function cleans up gpio_device */ | |
981 | gdev->dev.release = gpiodevice_release; | |
159f3cd9 GR |
982 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
983 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
984 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
985 | ||
986 | return 0; | |
987 | ||
988 | err_remove_device: | |
989 | device_del(&gdev->dev); | |
990 | err_remove_chardev: | |
991 | cdev_del(&gdev->chrdev); | |
992 | return status; | |
993 | } | |
994 | ||
995 | static void gpiochip_setup_devs(void) | |
996 | { | |
997 | struct gpio_device *gdev; | |
998 | int err; | |
999 | ||
1000 | list_for_each_entry(gdev, &gpio_devices, list) { | |
1001 | err = gpiochip_setup_dev(gdev); | |
1002 | if (err) | |
1003 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
1004 | dev_name(&gdev->dev), err); | |
1005 | } | |
1006 | } | |
1007 | ||
d2876d08 | 1008 | /** |
b08ea35a | 1009 | * gpiochip_add_data() - register a gpio_chip |
d2876d08 | 1010 | * @chip: the chip to register, with chip->base initialized |
14e85c0e | 1011 | * Context: potentially before irqs will work |
d2876d08 DB |
1012 | * |
1013 | * Returns a negative errno if the chip can't be registered, such as | |
1014 | * because the chip->base is invalid or already associated with a | |
1015 | * different chip. Otherwise it returns zero as a success code. | |
8d0aab2f | 1016 | * |
b08ea35a | 1017 | * When gpiochip_add_data() is called very early during boot, so that GPIOs |
c88402c2 | 1018 | * can be freely used, the chip->parent device must be registered before |
d8f388d8 DB |
1019 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization |
1020 | * for GPIOs will fail rudely. | |
1021 | * | |
159f3cd9 GR |
1022 | * gpiochip_add_data() must only be called after gpiolib initialization, |
1023 | * ie after core_initcall(). | |
1024 | * | |
8d0aab2f AV |
1025 | * If chip->base is negative, this requests dynamic assignment of |
1026 | * a range of valid GPIOs. | |
d2876d08 | 1027 | */ |
b08ea35a | 1028 | int gpiochip_add_data(struct gpio_chip *chip, void *data) |
d2876d08 DB |
1029 | { |
1030 | unsigned long flags; | |
1031 | int status = 0; | |
ff2b1359 | 1032 | unsigned i; |
8d0aab2f | 1033 | int base = chip->base; |
ff2b1359 | 1034 | struct gpio_device *gdev; |
d2876d08 | 1035 | |
ff2b1359 LW |
1036 | /* |
1037 | * First: allocate and populate the internal stat container, and | |
1038 | * set up the struct device. | |
1039 | */ | |
969f07b4 | 1040 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 1041 | if (!gdev) |
14e85c0e | 1042 | return -ENOMEM; |
3c702e99 | 1043 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
1044 | gdev->chip = chip; |
1045 | chip->gpiodev = gdev; | |
1046 | if (chip->parent) { | |
1047 | gdev->dev.parent = chip->parent; | |
1048 | gdev->dev.of_node = chip->parent->of_node; | |
acc6e331 TR |
1049 | } |
1050 | ||
ff2b1359 LW |
1051 | #ifdef CONFIG_OF_GPIO |
1052 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
acc6e331 TR |
1053 | if (chip->of_node) |
1054 | gdev->dev.of_node = chip->of_node; | |
ff2b1359 | 1055 | #endif |
acc6e331 | 1056 | |
ff2b1359 LW |
1057 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); |
1058 | if (gdev->id < 0) { | |
1059 | status = gdev->id; | |
1060 | goto err_free_gdev; | |
1061 | } | |
1062 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
1063 | device_initialize(&gdev->dev); | |
1064 | dev_set_drvdata(&gdev->dev, gdev); | |
1065 | if (chip->parent && chip->parent->driver) | |
1066 | gdev->owner = chip->parent->driver->owner; | |
1067 | else if (chip->owner) | |
1068 | /* TODO: remove chip->owner */ | |
1069 | gdev->owner = chip->owner; | |
1070 | else | |
1071 | gdev->owner = THIS_MODULE; | |
d2876d08 | 1072 | |
476e2fc5 | 1073 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 1074 | if (!gdev->descs) { |
ff2b1359 LW |
1075 | status = -ENOMEM; |
1076 | goto err_free_gdev; | |
1077 | } | |
1078 | ||
5ed41cc4 BJZ |
1079 | if (chip->ngpio == 0) { |
1080 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 1081 | status = -EINVAL; |
159f3cd9 | 1082 | goto err_free_descs; |
5ed41cc4 | 1083 | } |
df4878e9 LW |
1084 | |
1085 | if (chip->label) | |
476e2fc5 | 1086 | gdev->label = kstrdup(chip->label, GFP_KERNEL); |
df4878e9 | 1087 | else |
476e2fc5 | 1088 | gdev->label = kstrdup("unknown", GFP_KERNEL); |
df4878e9 LW |
1089 | if (!gdev->label) { |
1090 | status = -ENOMEM; | |
476e2fc5 | 1091 | goto err_free_descs; |
df4878e9 LW |
1092 | } |
1093 | ||
fdeb8e15 | 1094 | gdev->ngpio = chip->ngpio; |
43c54eca | 1095 | gdev->data = data; |
5ed41cc4 | 1096 | |
d2876d08 DB |
1097 | spin_lock_irqsave(&gpio_lock, flags); |
1098 | ||
fdeb8e15 LW |
1099 | /* |
1100 | * TODO: this allocates a Linux GPIO number base in the global | |
1101 | * GPIO numberspace for this chip. In the long run we want to | |
1102 | * get *rid* of this numberspace and use only descriptors, but | |
1103 | * it may be a pipe dream. It will not happen before we get rid | |
1104 | * of the sysfs interface anyways. | |
1105 | */ | |
8d0aab2f AV |
1106 | if (base < 0) { |
1107 | base = gpiochip_find_base(chip->ngpio); | |
1108 | if (base < 0) { | |
1109 | status = base; | |
225fce83 | 1110 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1111 | goto err_free_label; |
8d0aab2f | 1112 | } |
fdeb8e15 LW |
1113 | /* |
1114 | * TODO: it should not be necessary to reflect the assigned | |
1115 | * base outside of the GPIO subsystem. Go over drivers and | |
1116 | * see if anyone makes use of this, else drop this and assign | |
1117 | * a poison instead. | |
1118 | */ | |
8d0aab2f AV |
1119 | chip->base = base; |
1120 | } | |
fdeb8e15 | 1121 | gdev->base = base; |
8d0aab2f | 1122 | |
ff2b1359 | 1123 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
1124 | if (status) { |
1125 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 1126 | goto err_free_label; |
05aa5203 | 1127 | } |
1a989d0f | 1128 | |
545ebd9a LW |
1129 | spin_unlock_irqrestore(&gpio_lock, flags); |
1130 | ||
ff2b1359 | 1131 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 1132 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 1133 | |
fdeb8e15 | 1134 | desc->gdev = gdev; |
72d32000 LW |
1135 | /* |
1136 | * REVISIT: most hardware initializes GPIOs as inputs | |
1137 | * (often with pullups enabled) so power usage is | |
1138 | * minimized. Linux code should set the gpio direction | |
1139 | * first thing; but until it does, and in case | |
1140 | * chip->get_direction is not set, we may expose the | |
1141 | * wrong direction in sysfs. | |
05aa5203 | 1142 | */ |
72d32000 LW |
1143 | |
1144 | if (chip->get_direction) { | |
1145 | /* | |
1146 | * If we have .get_direction, set up the initial | |
1147 | * direction flag from the hardware. | |
1148 | */ | |
1149 | int dir = chip->get_direction(chip, i); | |
1150 | ||
1151 | if (!dir) | |
1152 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1153 | } else if (!chip->direction_input) { | |
1154 | /* | |
1155 | * If the chip lacks the .direction_input callback | |
1156 | * we logically assume all lines are outputs. | |
1157 | */ | |
1158 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1159 | } | |
d2876d08 | 1160 | } |
14e85c0e | 1161 | |
f23f1516 | 1162 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 1163 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
1164 | #endif |
1165 | ||
5f3ca732 MP |
1166 | status = gpiochip_set_desc_names(chip); |
1167 | if (status) | |
1168 | goto err_remove_from_list; | |
1169 | ||
28355f81 TV |
1170 | status = of_gpiochip_add(chip); |
1171 | if (status) | |
1172 | goto err_remove_chip; | |
1173 | ||
664e3e5a | 1174 | acpi_gpiochip_add(chip); |
391c970c | 1175 | |
3c702e99 LW |
1176 | /* |
1177 | * By first adding the chardev, and then adding the device, | |
1178 | * we get a device node entry in sysfs under | |
1179 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
1180 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
1181 | * We can do this only if gpiolib has been initialized. |
1182 | * Otherwise, defer until later. | |
3c702e99 | 1183 | */ |
159f3cd9 GR |
1184 | if (gpiolib_initialized) { |
1185 | status = gpiochip_setup_dev(gdev); | |
1186 | if (status) | |
1187 | goto err_remove_chip; | |
1188 | } | |
cedb1881 | 1189 | return 0; |
3bae4811 | 1190 | |
225fce83 JH |
1191 | err_remove_chip: |
1192 | acpi_gpiochip_remove(chip); | |
6d86750c | 1193 | gpiochip_free_hogs(chip); |
225fce83 | 1194 | of_gpiochip_remove(chip); |
5f3ca732 | 1195 | err_remove_from_list: |
225fce83 | 1196 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 1197 | list_del(&gdev->list); |
3bae4811 | 1198 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 GR |
1199 | err_free_label: |
1200 | kfree(gdev->label); | |
1201 | err_free_descs: | |
1202 | kfree(gdev->descs); | |
ff2b1359 LW |
1203 | err_free_gdev: |
1204 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 1205 | /* failures here can mean systems won't boot... */ |
7589e59f | 1206 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
fdeb8e15 LW |
1207 | gdev->base, gdev->base + gdev->ngpio - 1, |
1208 | chip->label ? : "generic"); | |
1209 | kfree(gdev); | |
d2876d08 DB |
1210 | return status; |
1211 | } | |
b08ea35a | 1212 | EXPORT_SYMBOL_GPL(gpiochip_add_data); |
d2876d08 | 1213 | |
43c54eca LW |
1214 | /** |
1215 | * gpiochip_get_data() - get per-subdriver data for the chip | |
1216 | */ | |
1217 | void *gpiochip_get_data(struct gpio_chip *chip) | |
1218 | { | |
1219 | return chip->gpiodev->data; | |
1220 | } | |
1221 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
1222 | ||
d2876d08 DB |
1223 | /** |
1224 | * gpiochip_remove() - unregister a gpio_chip | |
1225 | * @chip: the chip to unregister | |
1226 | * | |
1227 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1228 | */ | |
e1db1706 | 1229 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 1230 | { |
ff2b1359 | 1231 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 1232 | struct gpio_desc *desc; |
d2876d08 | 1233 | unsigned long flags; |
1c3cdb18 | 1234 | unsigned i; |
fab28b89 | 1235 | bool requested = false; |
d2876d08 | 1236 | |
ff2b1359 | 1237 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 1238 | gpiochip_sysfs_unregister(gdev); |
bd203bd5 BJZ |
1239 | /* Numb the device, cancelling all outstanding operations */ |
1240 | gdev->chip = NULL; | |
00acc3dc | 1241 | gpiochip_irqchip_remove(chip); |
6072b9dc | 1242 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 1243 | gpiochip_remove_pin_ranges(chip); |
f625d460 | 1244 | gpiochip_free_hogs(chip); |
391c970c | 1245 | of_gpiochip_remove(chip); |
43c54eca LW |
1246 | /* |
1247 | * We accept no more calls into the driver from this point, so | |
1248 | * NULL the driver data pointer | |
1249 | */ | |
1250 | gdev->data = NULL; | |
391c970c | 1251 | |
6798acaa | 1252 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 1253 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 1254 | desc = &gdev->descs[i]; |
fab28b89 JH |
1255 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
1256 | requested = true; | |
d2876d08 | 1257 | } |
d2876d08 | 1258 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 1259 | |
fab28b89 | 1260 | if (requested) |
fdeb8e15 | 1261 | dev_crit(&gdev->dev, |
58383c78 | 1262 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 1263 | |
ff2b1359 LW |
1264 | /* |
1265 | * The gpiochip side puts its use of the device to rest here: | |
1266 | * if there are no userspace clients, the chardev and device will | |
1267 | * be removed, else it will be dangling until the last user is | |
1268 | * gone. | |
1269 | */ | |
f4833b8c RRD |
1270 | cdev_del(&gdev->chrdev); |
1271 | device_del(&gdev->dev); | |
ff2b1359 | 1272 | put_device(&gdev->dev); |
d2876d08 DB |
1273 | } |
1274 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
1275 | ||
0cf3292c LD |
1276 | static void devm_gpio_chip_release(struct device *dev, void *res) |
1277 | { | |
1278 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
1279 | ||
1280 | gpiochip_remove(chip); | |
1281 | } | |
1282 | ||
1283 | static int devm_gpio_chip_match(struct device *dev, void *res, void *data) | |
1284 | ||
1285 | { | |
1286 | struct gpio_chip **r = res; | |
1287 | ||
1288 | if (!r || !*r) { | |
1289 | WARN_ON(!r || !*r); | |
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | return *r == data; | |
1294 | } | |
1295 | ||
1296 | /** | |
1297 | * devm_gpiochip_add_data() - Resource manager piochip_add_data() | |
1298 | * @dev: the device pointer on which irq_chip belongs to. | |
1299 | * @chip: the chip to register, with chip->base initialized | |
1300 | * Context: potentially before irqs will work | |
1301 | * | |
1302 | * Returns a negative errno if the chip can't be registered, such as | |
1303 | * because the chip->base is invalid or already associated with a | |
1304 | * different chip. Otherwise it returns zero as a success code. | |
1305 | * | |
1306 | * The gpio chip automatically be released when the device is unbound. | |
1307 | */ | |
1308 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
1309 | void *data) | |
1310 | { | |
1311 | struct gpio_chip **ptr; | |
1312 | int ret; | |
1313 | ||
1314 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
1315 | GFP_KERNEL); | |
1316 | if (!ptr) | |
1317 | return -ENOMEM; | |
1318 | ||
1319 | ret = gpiochip_add_data(chip, data); | |
1320 | if (ret < 0) { | |
1321 | devres_free(ptr); | |
1322 | return ret; | |
1323 | } | |
1324 | ||
1325 | *ptr = chip; | |
1326 | devres_add(dev, ptr); | |
1327 | ||
1328 | return 0; | |
1329 | } | |
1330 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
1331 | ||
1332 | /** | |
1333 | * devm_gpiochip_remove() - Resource manager of gpiochip_remove() | |
1334 | * @dev: device for which which resource was allocated | |
1335 | * @chip: the chip to remove | |
1336 | * | |
1337 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1338 | */ | |
1339 | void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) | |
1340 | { | |
1341 | int ret; | |
1342 | ||
1343 | ret = devres_release(dev, devm_gpio_chip_release, | |
1344 | devm_gpio_chip_match, chip); | |
1345 | if (!ret) | |
1346 | WARN_ON(ret); | |
1347 | } | |
1348 | EXPORT_SYMBOL_GPL(devm_gpiochip_remove); | |
1349 | ||
594fa265 GL |
1350 | /** |
1351 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
1352 | * @data: data to pass to match function | |
1353 | * @callback: Callback function to check gpio_chip | |
1354 | * | |
1355 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
1356 | * determined by a user supplied @match callback. The callback should return | |
1357 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
1358 | * non-zero, this function will return to the caller and not iterate over any | |
1359 | * more gpio_chips. | |
1360 | */ | |
07ce8ec7 | 1361 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 1362 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 1363 | void *data)) |
594fa265 | 1364 | { |
ff2b1359 | 1365 | struct gpio_device *gdev; |
acf06ff7 | 1366 | struct gpio_chip *chip = NULL; |
594fa265 | 1367 | unsigned long flags; |
594fa265 GL |
1368 | |
1369 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 | 1370 | list_for_each_entry(gdev, &gpio_devices, list) |
acf06ff7 MY |
1371 | if (gdev->chip && match(gdev->chip, data)) { |
1372 | chip = gdev->chip; | |
594fa265 | 1373 | break; |
acf06ff7 | 1374 | } |
ff2b1359 | 1375 | |
594fa265 GL |
1376 | spin_unlock_irqrestore(&gpio_lock, flags); |
1377 | ||
1378 | return chip; | |
1379 | } | |
8fa0c9bf | 1380 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 1381 | |
79697ef9 AC |
1382 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
1383 | { | |
1384 | const char *name = data; | |
1385 | ||
1386 | return !strcmp(chip->label, name); | |
1387 | } | |
1388 | ||
1389 | static struct gpio_chip *find_chip_by_name(const char *name) | |
1390 | { | |
1391 | return gpiochip_find((void *)name, gpiochip_match_name); | |
1392 | } | |
1393 | ||
14250520 LW |
1394 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
1395 | ||
1396 | /* | |
1397 | * The following is irqchip helper code for gpiochips. | |
1398 | */ | |
1399 | ||
1400 | /** | |
3f97d5fc LW |
1401 | * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip |
1402 | * @gpiochip: the gpiochip to set the irqchip chain to | |
1403 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
1404 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
1405 | * chained irqchip | |
1406 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
1407 | * coming out of the gpiochip. If the interrupt is nested rather than |
1408 | * cascaded, pass NULL in this handler argument | |
14250520 LW |
1409 | */ |
1410 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
1411 | struct irq_chip *irqchip, | |
1412 | int parent_irq, | |
1413 | irq_flow_handler_t parent_handler) | |
1414 | { | |
83141a77 LW |
1415 | unsigned int offset; |
1416 | ||
83141a77 LW |
1417 | if (!gpiochip->irqdomain) { |
1418 | chip_err(gpiochip, "called %s before setting up irqchip\n", | |
1419 | __func__); | |
1c8732bb LW |
1420 | return; |
1421 | } | |
1422 | ||
3f97d5fc LW |
1423 | if (parent_handler) { |
1424 | if (gpiochip->can_sleep) { | |
1425 | chip_err(gpiochip, | |
1426 | "you cannot have chained interrupts on a " | |
1427 | "chip that may sleep\n"); | |
1428 | return; | |
1429 | } | |
3f97d5fc LW |
1430 | /* |
1431 | * The parent irqchip is already using the chip_data for this | |
1432 | * irqchip, so our callbacks simply use the handler_data. | |
1433 | */ | |
f7f87753 TG |
1434 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
1435 | gpiochip); | |
25e4fe92 DES |
1436 | |
1437 | gpiochip->irq_parent = parent_irq; | |
3f97d5fc | 1438 | } |
83141a77 LW |
1439 | |
1440 | /* Set the parent IRQ for all affected IRQs */ | |
1441 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
1442 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), | |
1443 | parent_irq); | |
14250520 LW |
1444 | } |
1445 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); | |
1446 | ||
1447 | /** | |
1448 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
1449 | * @d: the irqdomain used by this irqchip | |
1450 | * @irq: the global irq number used by this GPIO irqchip irq | |
1451 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
1452 | * | |
1453 | * This function will set up the mapping for a certain IRQ line on a | |
1454 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
1455 | * stored inside the gpiochip. | |
1456 | */ | |
1457 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, | |
1458 | irq_hw_number_t hwirq) | |
1459 | { | |
1460 | struct gpio_chip *chip = d->host_data; | |
1461 | ||
14250520 | 1462 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
1463 | /* |
1464 | * This lock class tells lockdep that GPIO irqs are in a different | |
1465 | * category than their parents, so it won't report false recursion. | |
1466 | */ | |
1467 | irq_set_lockdep_class(irq, chip->lock_key); | |
7633fb95 | 1468 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
1c8732bb | 1469 | /* Chips that can sleep need nested thread handlers */ |
295494af | 1470 | if (chip->can_sleep && !chip->irq_not_threaded) |
1c8732bb | 1471 | irq_set_nested_thread(irq, 1); |
14250520 | 1472 | irq_set_noprobe(irq); |
23393d49 | 1473 | |
1333b90f LW |
1474 | /* |
1475 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
1476 | * is passed as default type. | |
1477 | */ | |
1478 | if (chip->irq_default_type != IRQ_TYPE_NONE) | |
1479 | irq_set_irq_type(irq, chip->irq_default_type); | |
14250520 LW |
1480 | |
1481 | return 0; | |
1482 | } | |
1483 | ||
c3626fde LW |
1484 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
1485 | { | |
1c8732bb LW |
1486 | struct gpio_chip *chip = d->host_data; |
1487 | ||
1c8732bb LW |
1488 | if (chip->can_sleep) |
1489 | irq_set_nested_thread(irq, 0); | |
c3626fde LW |
1490 | irq_set_chip_and_handler(irq, NULL, NULL); |
1491 | irq_set_chip_data(irq, NULL); | |
1492 | } | |
1493 | ||
14250520 LW |
1494 | static const struct irq_domain_ops gpiochip_domain_ops = { |
1495 | .map = gpiochip_irq_map, | |
c3626fde | 1496 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
1497 | /* Virtually all GPIO irqchips are twocell:ed */ |
1498 | .xlate = irq_domain_xlate_twocell, | |
1499 | }; | |
1500 | ||
1501 | static int gpiochip_irq_reqres(struct irq_data *d) | |
1502 | { | |
1503 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1504 | ||
ff2b1359 | 1505 | if (!try_module_get(chip->gpiodev->owner)) |
5b76e79c GS |
1506 | return -ENODEV; |
1507 | ||
e3a2e878 | 1508 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
1509 | chip_err(chip, |
1510 | "unable to lock HW IRQ %lu for IRQ\n", | |
1511 | d->hwirq); | |
ff2b1359 | 1512 | module_put(chip->gpiodev->owner); |
14250520 LW |
1513 | return -EINVAL; |
1514 | } | |
1515 | return 0; | |
1516 | } | |
1517 | ||
1518 | static void gpiochip_irq_relres(struct irq_data *d) | |
1519 | { | |
1520 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1521 | ||
e3a2e878 | 1522 | gpiochip_unlock_as_irq(chip, d->hwirq); |
ff2b1359 | 1523 | module_put(chip->gpiodev->owner); |
14250520 LW |
1524 | } |
1525 | ||
1526 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
1527 | { | |
1528 | return irq_find_mapping(chip->irqdomain, offset); | |
1529 | } | |
1530 | ||
1531 | /** | |
1532 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1533 | * @gpiochip: the gpiochip to remove the irqchip from | |
1534 | * | |
1535 | * This is called only from gpiochip_remove() | |
1536 | */ | |
1537 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
1538 | { | |
c3626fde LW |
1539 | unsigned int offset; |
1540 | ||
afa82fab MW |
1541 | acpi_gpiochip_free_interrupts(gpiochip); |
1542 | ||
25e4fe92 DES |
1543 | if (gpiochip->irq_parent) { |
1544 | irq_set_chained_handler(gpiochip->irq_parent, NULL); | |
1545 | irq_set_handler_data(gpiochip->irq_parent, NULL); | |
1546 | } | |
1547 | ||
c3626fde LW |
1548 | /* Remove all IRQ mappings and delete the domain */ |
1549 | if (gpiochip->irqdomain) { | |
1550 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
e3893386 GS |
1551 | irq_dispose_mapping( |
1552 | irq_find_mapping(gpiochip->irqdomain, offset)); | |
14250520 | 1553 | irq_domain_remove(gpiochip->irqdomain); |
c3626fde | 1554 | } |
14250520 LW |
1555 | |
1556 | if (gpiochip->irqchip) { | |
1557 | gpiochip->irqchip->irq_request_resources = NULL; | |
1558 | gpiochip->irqchip->irq_release_resources = NULL; | |
1559 | gpiochip->irqchip = NULL; | |
1560 | } | |
1561 | } | |
1562 | ||
1563 | /** | |
1564 | * gpiochip_irqchip_add() - adds an irqchip to a gpiochip | |
1565 | * @gpiochip: the gpiochip to add the irqchip to | |
1566 | * @irqchip: the irqchip to add to the gpiochip | |
1567 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
1568 | * allocate gpiochip irqs from | |
1569 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
1570 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
1571 | * to have the core avoid setting up any default type in the hardware. | |
a0a8bcf4 | 1572 | * @lock_key: lockdep class |
14250520 LW |
1573 | * |
1574 | * This function closely associates a certain irqchip with a certain | |
1575 | * gpiochip, providing an irq domain to translate the local IRQs to | |
1576 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
1577 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 1578 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
1579 | * from the gpiochip passed as chip data. An irqdomain will be stored |
1580 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
1581 | * translation. The gpiochip will need to be initialized and registered | |
1582 | * before calling this function. | |
1583 | * | |
c3626fde LW |
1584 | * This function will handle two cell:ed simple IRQs and assumes all |
1585 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
1586 | * need to be open coded. |
1587 | */ | |
a0a8bcf4 GS |
1588 | int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, |
1589 | struct irq_chip *irqchip, | |
1590 | unsigned int first_irq, | |
1591 | irq_flow_handler_t handler, | |
1592 | unsigned int type, | |
1593 | struct lock_class_key *lock_key) | |
14250520 LW |
1594 | { |
1595 | struct device_node *of_node; | |
1596 | unsigned int offset; | |
c3626fde | 1597 | unsigned irq_base = 0; |
14250520 LW |
1598 | |
1599 | if (!gpiochip || !irqchip) | |
1600 | return -EINVAL; | |
1601 | ||
58383c78 | 1602 | if (!gpiochip->parent) { |
14250520 LW |
1603 | pr_err("missing gpiochip .dev parent pointer\n"); |
1604 | return -EINVAL; | |
1605 | } | |
58383c78 | 1606 | of_node = gpiochip->parent->of_node; |
14250520 LW |
1607 | #ifdef CONFIG_OF_GPIO |
1608 | /* | |
20a8a968 | 1609 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
1610 | * FIXME: get rid of this and use gpiochip->parent->of_node |
1611 | * everywhere | |
14250520 LW |
1612 | */ |
1613 | if (gpiochip->of_node) | |
1614 | of_node = gpiochip->of_node; | |
1615 | #endif | |
332e99d5 MZ |
1616 | /* |
1617 | * Specifying a default trigger is a terrible idea if DT is | |
1618 | * used to configure the interrupts, as you may end-up with | |
1619 | * conflicting triggers. Tell the user, and reset to NONE. | |
1620 | */ | |
1621 | if (WARN(of_node && type != IRQ_TYPE_NONE, | |
1622 | "%s: Ignoring %d default trigger\n", of_node->full_name, type)) | |
1623 | type = IRQ_TYPE_NONE; | |
1624 | ||
14250520 LW |
1625 | gpiochip->irqchip = irqchip; |
1626 | gpiochip->irq_handler = handler; | |
1627 | gpiochip->irq_default_type = type; | |
1628 | gpiochip->to_irq = gpiochip_to_irq; | |
a0a8bcf4 | 1629 | gpiochip->lock_key = lock_key; |
14250520 LW |
1630 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
1631 | gpiochip->ngpio, first_irq, | |
1632 | &gpiochip_domain_ops, gpiochip); | |
1633 | if (!gpiochip->irqdomain) { | |
1634 | gpiochip->irqchip = NULL; | |
1635 | return -EINVAL; | |
1636 | } | |
8b67a1f0 RV |
1637 | |
1638 | /* | |
1639 | * It is possible for a driver to override this, but only if the | |
1640 | * alternative functions are both implemented. | |
1641 | */ | |
1642 | if (!irqchip->irq_request_resources && | |
1643 | !irqchip->irq_release_resources) { | |
1644 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1645 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1646 | } | |
14250520 LW |
1647 | |
1648 | /* | |
1649 | * Prepare the mapping since the irqchip shall be orthogonal to | |
1650 | * any gpiochip calls. If the first_irq was zero, this is | |
1651 | * necessary to allocate descriptors for all IRQs. | |
1652 | */ | |
c3626fde LW |
1653 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1654 | irq_base = irq_create_mapping(gpiochip->irqdomain, offset); | |
1655 | if (offset == 0) | |
1656 | /* | |
1657 | * Store the base into the gpiochip to be used when | |
1658 | * unmapping the irqs. | |
1659 | */ | |
1660 | gpiochip->irq_base = irq_base; | |
1661 | } | |
14250520 | 1662 | |
afa82fab MW |
1663 | acpi_gpiochip_request_interrupts(gpiochip); |
1664 | ||
14250520 LW |
1665 | return 0; |
1666 | } | |
a0a8bcf4 | 1667 | EXPORT_SYMBOL_GPL(_gpiochip_irqchip_add); |
14250520 LW |
1668 | |
1669 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
1670 | ||
1671 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} | |
1672 | ||
1673 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
1674 | ||
c771c2f4 JG |
1675 | /** |
1676 | * gpiochip_generic_request() - request the gpio function for a pin | |
1677 | * @chip: the gpiochip owning the GPIO | |
1678 | * @offset: the offset of the GPIO to request for GPIO function | |
1679 | */ | |
1680 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
1681 | { | |
fdeb8e15 | 1682 | return pinctrl_request_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1683 | } |
1684 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
1685 | ||
1686 | /** | |
1687 | * gpiochip_generic_free() - free the gpio function from a pin | |
1688 | * @chip: the gpiochip to request the gpio function for | |
1689 | * @offset: the offset of the GPIO to free from GPIO function | |
1690 | */ | |
1691 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
1692 | { | |
fdeb8e15 | 1693 | pinctrl_free_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1694 | } |
1695 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
1696 | ||
f23f1516 | 1697 | #ifdef CONFIG_PINCTRL |
165adc9c | 1698 | |
586a87e6 CR |
1699 | /** |
1700 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
1701 | * @chip: the gpiochip to add the range for | |
d32651f6 | 1702 | * @pctldev: the pin controller to map to |
586a87e6 CR |
1703 | * @gpio_offset: the start offset in the current gpio_chip number space |
1704 | * @pin_group: name of the pin group inside the pin controller | |
1705 | */ | |
1706 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
1707 | struct pinctrl_dev *pctldev, | |
1708 | unsigned int gpio_offset, const char *pin_group) | |
1709 | { | |
1710 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1711 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
1712 | int ret; |
1713 | ||
1714 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
1715 | if (!pin_range) { | |
1a2a99c6 | 1716 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
1717 | return -ENOMEM; |
1718 | } | |
1719 | ||
1720 | /* Use local offset as range ID */ | |
1721 | pin_range->range.id = gpio_offset; | |
1722 | pin_range->range.gc = chip; | |
1723 | pin_range->range.name = chip->label; | |
fdeb8e15 | 1724 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
1725 | pin_range->pctldev = pctldev; |
1726 | ||
1727 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
1728 | &pin_range->range.pins, | |
1729 | &pin_range->range.npins); | |
61c6375d MN |
1730 | if (ret < 0) { |
1731 | kfree(pin_range); | |
586a87e6 | 1732 | return ret; |
61c6375d | 1733 | } |
586a87e6 CR |
1734 | |
1735 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
1736 | ||
1a2a99c6 AS |
1737 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
1738 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
1739 | pinctrl_dev_get_devname(pctldev), pin_group); |
1740 | ||
20ec3e39 | 1741 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
1742 | |
1743 | return 0; | |
1744 | } | |
1745 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
1746 | ||
3f0f8670 LW |
1747 | /** |
1748 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
1749 | * @chip: the gpiochip to add the range for | |
1750 | * @pinctrl_name: the dev_name() of the pin controller to map to | |
316511c0 LW |
1751 | * @gpio_offset: the start offset in the current gpio_chip number space |
1752 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
1753 | * @npins: the number of pins from the offset of each pin space (GPIO and |
1754 | * pin controller) to accumulate in this range | |
1755 | */ | |
1e63d7b9 | 1756 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 1757 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 1758 | unsigned int npins) |
f23f1516 SH |
1759 | { |
1760 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1761 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 1762 | int ret; |
f23f1516 | 1763 | |
3f0f8670 | 1764 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 1765 | if (!pin_range) { |
1a2a99c6 | 1766 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 1767 | return -ENOMEM; |
f23f1516 SH |
1768 | } |
1769 | ||
3f0f8670 | 1770 | /* Use local offset as range ID */ |
316511c0 | 1771 | pin_range->range.id = gpio_offset; |
3f0f8670 | 1772 | pin_range->range.gc = chip; |
f23f1516 | 1773 | pin_range->range.name = chip->label; |
fdeb8e15 | 1774 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 1775 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 1776 | pin_range->range.npins = npins; |
192c369c | 1777 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 1778 | &pin_range->range); |
8f23ca1a | 1779 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 1780 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 1781 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 1782 | kfree(pin_range); |
b4d4b1f0 | 1783 | return ret; |
3f0f8670 | 1784 | } |
1a2a99c6 AS |
1785 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
1786 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
1787 | pinctl_name, |
1788 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 1789 | |
20ec3e39 | 1790 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
1791 | |
1792 | return 0; | |
f23f1516 | 1793 | } |
165adc9c | 1794 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 1795 | |
3f0f8670 LW |
1796 | /** |
1797 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
1798 | * @chip: the chip to remove all the mappings for | |
1799 | */ | |
f23f1516 SH |
1800 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
1801 | { | |
1802 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 1803 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 1804 | |
20ec3e39 | 1805 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
1806 | list_del(&pin_range->node); |
1807 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
1808 | &pin_range->range); | |
3f0f8670 | 1809 | kfree(pin_range); |
f23f1516 SH |
1810 | } |
1811 | } | |
165adc9c LW |
1812 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
1813 | ||
1814 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 1815 | |
d2876d08 DB |
1816 | /* These "optional" allocation calls help prevent drivers from stomping |
1817 | * on each other, and help provide better diagnostics in debugfs. | |
1818 | * They're called even less than the "set direction" calls. | |
1819 | */ | |
77c2d792 | 1820 | static int __gpiod_request(struct gpio_desc *desc, const char *label) |
d2876d08 | 1821 | { |
fdeb8e15 | 1822 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 1823 | int status; |
d2876d08 DB |
1824 | unsigned long flags; |
1825 | ||
bcabdef1 AC |
1826 | spin_lock_irqsave(&gpio_lock, flags); |
1827 | ||
d2876d08 | 1828 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 1829 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
1830 | */ |
1831 | ||
1832 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
1833 | desc_set_label(desc, label ? : "?"); | |
1834 | status = 0; | |
438d8908 | 1835 | } else { |
d2876d08 | 1836 | status = -EBUSY; |
7460db56 | 1837 | goto done; |
35e8bb51 DB |
1838 | } |
1839 | ||
1840 | if (chip->request) { | |
1841 | /* chip->request may sleep */ | |
1842 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1843 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1844 | spin_lock_irqsave(&gpio_lock, flags); |
1845 | ||
1846 | if (status < 0) { | |
1847 | desc_set_label(desc, NULL); | |
35e8bb51 | 1848 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 1849 | goto done; |
35e8bb51 | 1850 | } |
438d8908 | 1851 | } |
80b0a602 MN |
1852 | if (chip->get_direction) { |
1853 | /* chip->get_direction may sleep */ | |
1854 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1855 | gpiod_get_direction(desc); |
80b0a602 MN |
1856 | spin_lock_irqsave(&gpio_lock, flags); |
1857 | } | |
77c2d792 MW |
1858 | done: |
1859 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1860 | return status; | |
1861 | } | |
1862 | ||
fdeb8e15 LW |
1863 | /* |
1864 | * This descriptor validation needs to be inserted verbatim into each | |
1865 | * function taking a descriptor, so we need to use a preprocessor | |
54d77198 LW |
1866 | * macro to avoid endless duplication. If the desc is NULL it is an |
1867 | * optional GPIO and calls should just bail out. | |
fdeb8e15 LW |
1868 | */ |
1869 | #define VALIDATE_DESC(desc) do { \ | |
54d77198 LW |
1870 | if (!desc) \ |
1871 | return 0; \ | |
bfbbe44d LW |
1872 | if (IS_ERR(desc)) { \ |
1873 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
1874 | return PTR_ERR(desc); \ | |
1875 | } \ | |
54d77198 | 1876 | if (!desc->gdev) { \ |
bfbbe44d | 1877 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
1878 | return -EINVAL; \ |
1879 | } \ | |
1880 | if ( !desc->gdev->chip ) { \ | |
1881 | dev_warn(&desc->gdev->dev, \ | |
1882 | "%s: backing chip is gone\n", __func__); \ | |
1883 | return 0; \ | |
1884 | } } while (0) | |
1885 | ||
1886 | #define VALIDATE_DESC_VOID(desc) do { \ | |
54d77198 LW |
1887 | if (!desc) \ |
1888 | return; \ | |
bfbbe44d LW |
1889 | if (IS_ERR(desc)) { \ |
1890 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
1891 | return; \ | |
1892 | } \ | |
54d77198 | 1893 | if (!desc->gdev) { \ |
bfbbe44d | 1894 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
1895 | return; \ |
1896 | } \ | |
1897 | if (!desc->gdev->chip) { \ | |
1898 | dev_warn(&desc->gdev->dev, \ | |
1899 | "%s: backing chip is gone\n", __func__); \ | |
1900 | return; \ | |
1901 | } } while (0) | |
1902 | ||
1903 | ||
0eb4c6c2 | 1904 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
1905 | { |
1906 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 1907 | struct gpio_device *gdev; |
77c2d792 | 1908 | |
fdeb8e15 LW |
1909 | VALIDATE_DESC(desc); |
1910 | gdev = desc->gdev; | |
77c2d792 | 1911 | |
fdeb8e15 | 1912 | if (try_module_get(gdev->owner)) { |
77c2d792 MW |
1913 | status = __gpiod_request(desc, label); |
1914 | if (status < 0) | |
fdeb8e15 | 1915 | module_put(gdev->owner); |
33a68e86 LW |
1916 | else |
1917 | get_device(&gdev->dev); | |
77c2d792 MW |
1918 | } |
1919 | ||
d2876d08 | 1920 | if (status) |
7589e59f | 1921 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 1922 | |
d2876d08 DB |
1923 | return status; |
1924 | } | |
372e722e | 1925 | |
77c2d792 | 1926 | static bool __gpiod_free(struct gpio_desc *desc) |
d2876d08 | 1927 | { |
77c2d792 | 1928 | bool ret = false; |
d2876d08 | 1929 | unsigned long flags; |
35e8bb51 | 1930 | struct gpio_chip *chip; |
d2876d08 | 1931 | |
3d599d1c UKK |
1932 | might_sleep(); |
1933 | ||
372e722e | 1934 | gpiod_unexport(desc); |
d8f388d8 | 1935 | |
d2876d08 DB |
1936 | spin_lock_irqsave(&gpio_lock, flags); |
1937 | ||
fdeb8e15 | 1938 | chip = desc->gdev->chip; |
35e8bb51 DB |
1939 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
1940 | if (chip->free) { | |
1941 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 1942 | might_sleep_if(chip->can_sleep); |
372e722e | 1943 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1944 | spin_lock_irqsave(&gpio_lock, flags); |
1945 | } | |
d2876d08 | 1946 | desc_set_label(desc, NULL); |
07697461 | 1947 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 1948 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 1949 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 1950 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 1951 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
1952 | ret = true; |
1953 | } | |
d2876d08 DB |
1954 | |
1955 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
1956 | return ret; |
1957 | } | |
1958 | ||
0eb4c6c2 | 1959 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 1960 | { |
33a68e86 | 1961 | if (desc && desc->gdev && __gpiod_free(desc)) { |
fdeb8e15 | 1962 | module_put(desc->gdev->owner); |
33a68e86 LW |
1963 | put_device(&desc->gdev->dev); |
1964 | } else { | |
77c2d792 | 1965 | WARN_ON(extra_checks); |
33a68e86 | 1966 | } |
d2876d08 | 1967 | } |
372e722e | 1968 | |
d2876d08 DB |
1969 | /** |
1970 | * gpiochip_is_requested - return string iff signal was requested | |
1971 | * @chip: controller managing the signal | |
1972 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
1973 | * | |
1974 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
1975 | * The string returned is the label passed to gpio_request(); if none has been |
1976 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
1977 | * |
1978 | * This function is for use by GPIO controller drivers. The label can | |
1979 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
1980 | * can help avoid accidentally multiplexing it to another controller. | |
1981 | */ | |
1982 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
1983 | { | |
6c0b4e6c | 1984 | struct gpio_desc *desc; |
d2876d08 | 1985 | |
48b5953e | 1986 | if (offset >= chip->ngpio) |
d2876d08 | 1987 | return NULL; |
6c0b4e6c | 1988 | |
1c3cdb18 | 1989 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 1990 | |
372e722e | 1991 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 1992 | return NULL; |
372e722e | 1993 | return desc->label; |
d2876d08 DB |
1994 | } |
1995 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
1996 | ||
77c2d792 MW |
1997 | /** |
1998 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
1999 | * @desc: GPIO descriptor to request | |
2000 | * @label: label for the GPIO | |
2001 | * | |
2002 | * Function allows GPIO chip drivers to request and use their own GPIO | |
2003 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
2004 | * function will not increase reference count of the GPIO chip module. This | |
2005 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
2006 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
2007 | */ | |
abdc08a3 AC |
2008 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
2009 | const char *label) | |
77c2d792 | 2010 | { |
abdc08a3 AC |
2011 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
2012 | int err; | |
77c2d792 | 2013 | |
abdc08a3 AC |
2014 | if (IS_ERR(desc)) { |
2015 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
2016 | return desc; | |
2017 | } | |
2018 | ||
2019 | err = __gpiod_request(desc, label); | |
2020 | if (err < 0) | |
2021 | return ERR_PTR(err); | |
77c2d792 | 2022 | |
abdc08a3 | 2023 | return desc; |
77c2d792 | 2024 | } |
f7d4ad98 | 2025 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
2026 | |
2027 | /** | |
2028 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
2029 | * @desc: GPIO descriptor to free | |
2030 | * | |
2031 | * Function frees the given GPIO requested previously with | |
2032 | * gpiochip_request_own_desc(). | |
2033 | */ | |
2034 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
2035 | { | |
2036 | if (desc) | |
2037 | __gpiod_free(desc); | |
2038 | } | |
f7d4ad98 | 2039 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 2040 | |
fdeb8e15 LW |
2041 | /* |
2042 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
2043 | * some cases this is done in early boot, before IRQs are enabled. |
2044 | * | |
2045 | * As a rule these aren't called more than once (except for drivers | |
2046 | * using the open-drain emulation idiom) so these are natural places | |
2047 | * to accumulate extra debugging checks. Note that we can't (yet) | |
2048 | * rely on gpio_request() having been called beforehand. | |
2049 | */ | |
2050 | ||
79a9becd AC |
2051 | /** |
2052 | * gpiod_direction_input - set the GPIO direction to input | |
2053 | * @desc: GPIO to set to input | |
2054 | * | |
2055 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
2056 | * be called safely on it. | |
2057 | * | |
2058 | * Return 0 in case of success, else an error code. | |
2059 | */ | |
2060 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 2061 | { |
d2876d08 | 2062 | struct gpio_chip *chip; |
d2876d08 DB |
2063 | int status = -EINVAL; |
2064 | ||
fdeb8e15 LW |
2065 | VALIDATE_DESC(desc); |
2066 | chip = desc->gdev->chip; | |
bcabdef1 | 2067 | |
be1a4b13 | 2068 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
2069 | gpiod_warn(desc, |
2070 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 2071 | __func__); |
be1a4b13 LW |
2072 | return -EIO; |
2073 | } | |
2074 | ||
d82da797 | 2075 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
2076 | if (status == 0) |
2077 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 2078 | |
372e722e | 2079 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 2080 | |
d2876d08 DB |
2081 | return status; |
2082 | } | |
79a9becd | 2083 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 2084 | |
ef70bbe1 | 2085 | static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
d2876d08 | 2086 | { |
c663e5f5 LW |
2087 | struct gpio_chip *gc = desc->gdev->chip; |
2088 | int ret; | |
d2876d08 | 2089 | |
d468bf9e LW |
2090 | /* GPIOs used for IRQs shall not be set as output */ |
2091 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
2092 | gpiod_err(desc, | |
2093 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
2094 | __func__); | |
2095 | return -EIO; | |
2096 | } | |
2097 | ||
c663e5f5 LW |
2098 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
2099 | /* First see if we can enable open drain in hardware */ | |
2100 | if (gc->set_single_ended) { | |
2101 | ret = gc->set_single_ended(gc, gpio_chip_hwgpio(desc), | |
2102 | LINE_MODE_OPEN_DRAIN); | |
2103 | if (!ret) | |
2104 | goto set_output_value; | |
2105 | } | |
2106 | /* Emulate open drain by not actively driving the line high */ | |
2107 | if (value) | |
2108 | return gpiod_direction_input(desc); | |
2109 | } | |
2110 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
2111 | if (gc->set_single_ended) { | |
2112 | ret = gc->set_single_ended(gc, gpio_chip_hwgpio(desc), | |
2113 | LINE_MODE_OPEN_SOURCE); | |
2114 | if (!ret) | |
2115 | goto set_output_value; | |
2116 | } | |
2117 | /* Emulate open source by not actively driving the line low */ | |
2118 | if (!value) | |
2119 | return gpiod_direction_input(desc); | |
2120 | } else { | |
2121 | /* Make sure to disable open drain/source hardware, if any */ | |
2122 | if (gc->set_single_ended) | |
2123 | gc->set_single_ended(gc, | |
2124 | gpio_chip_hwgpio(desc), | |
2125 | LINE_MODE_PUSH_PULL); | |
2126 | } | |
25553ff0 | 2127 | |
c663e5f5 LW |
2128 | set_output_value: |
2129 | if (!gc->set || !gc->direction_output) { | |
6424de5a MB |
2130 | gpiod_warn(desc, |
2131 | "%s: missing set() or direction_output() operations\n", | |
2132 | __func__); | |
be1a4b13 LW |
2133 | return -EIO; |
2134 | } | |
2135 | ||
c663e5f5 LW |
2136 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), value); |
2137 | if (!ret) | |
d2876d08 | 2138 | set_bit(FLAG_IS_OUT, &desc->flags); |
372e722e | 2139 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
c663e5f5 LW |
2140 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
2141 | return ret; | |
d2876d08 | 2142 | } |
ef70bbe1 PZ |
2143 | |
2144 | /** | |
2145 | * gpiod_direction_output_raw - set the GPIO direction to output | |
2146 | * @desc: GPIO to set to output | |
2147 | * @value: initial output value of the GPIO | |
2148 | * | |
2149 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2150 | * be called safely on it. The initial value of the output must be specified | |
2151 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
2152 | * | |
2153 | * Return 0 in case of success, else an error code. | |
2154 | */ | |
2155 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
2156 | { | |
fdeb8e15 | 2157 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2158 | return _gpiod_direction_output_raw(desc, value); |
2159 | } | |
2160 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
2161 | ||
2162 | /** | |
90df4fe0 | 2163 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
2164 | * @desc: GPIO to set to output |
2165 | * @value: initial output value of the GPIO | |
2166 | * | |
2167 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2168 | * be called safely on it. The initial value of the output must be specified | |
2169 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2170 | * account. | |
2171 | * | |
2172 | * Return 0 in case of success, else an error code. | |
2173 | */ | |
2174 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
2175 | { | |
fdeb8e15 | 2176 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2177 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2178 | value = !value; | |
2179 | return _gpiod_direction_output_raw(desc, value); | |
2180 | } | |
79a9becd | 2181 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 2182 | |
c4b5be98 | 2183 | /** |
79a9becd | 2184 | * gpiod_set_debounce - sets @debounce time for a @gpio |
c4b5be98 FB |
2185 | * @gpio: the gpio to set debounce time |
2186 | * @debounce: debounce time is microseconds | |
65d87656 LW |
2187 | * |
2188 | * returns -ENOTSUPP if the controller does not support setting | |
2189 | * debounce. | |
c4b5be98 | 2190 | */ |
79a9becd | 2191 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 2192 | { |
c4b5be98 | 2193 | struct gpio_chip *chip; |
c4b5be98 | 2194 | |
fdeb8e15 LW |
2195 | VALIDATE_DESC(desc); |
2196 | chip = desc->gdev->chip; | |
be1a4b13 | 2197 | if (!chip->set || !chip->set_debounce) { |
6424de5a MB |
2198 | gpiod_dbg(desc, |
2199 | "%s: missing set() or set_debounce() operations\n", | |
2200 | __func__); | |
65d87656 | 2201 | return -ENOTSUPP; |
be1a4b13 LW |
2202 | } |
2203 | ||
d82da797 | 2204 | return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce); |
c4b5be98 | 2205 | } |
79a9becd | 2206 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 2207 | |
79a9becd AC |
2208 | /** |
2209 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
2210 | * @desc: the gpio descriptor to test | |
2211 | * | |
2212 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
2213 | */ | |
2214 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 2215 | { |
fdeb8e15 | 2216 | VALIDATE_DESC(desc); |
79a9becd | 2217 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 2218 | } |
79a9becd | 2219 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
2220 | |
2221 | /* I/O calls are only valid after configuration completed; the relevant | |
2222 | * "is this a valid GPIO" error checks should already have been done. | |
2223 | * | |
2224 | * "Get" operations are often inlinable as reading a pin value register, | |
2225 | * and masking the relevant bit in that register. | |
2226 | * | |
2227 | * When "set" operations are inlinable, they involve writing that mask to | |
2228 | * one register to set a low value, or a different register to set it high. | |
2229 | * Otherwise locking is needed, so there may be little value to inlining. | |
2230 | * | |
2231 | *------------------------------------------------------------------------ | |
2232 | * | |
2233 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
2234 | * have requested the GPIO. That can include implicit requesting by | |
2235 | * a direction setting call. Marking a gpio as requested locks its chip | |
2236 | * in memory, guaranteeing that these table lookups need no more locking | |
2237 | * and that gpiochip_remove() will fail. | |
2238 | * | |
2239 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
2240 | * that the GPIO was actually requested. | |
2241 | */ | |
2242 | ||
e20538b8 | 2243 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 DB |
2244 | { |
2245 | struct gpio_chip *chip; | |
372e722e | 2246 | int offset; |
e20538b8 | 2247 | int value; |
d2876d08 | 2248 | |
fdeb8e15 | 2249 | chip = desc->gdev->chip; |
372e722e | 2250 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 2251 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 2252 | value = value < 0 ? value : !!value; |
372e722e | 2253 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 2254 | return value; |
d2876d08 | 2255 | } |
372e722e | 2256 | |
d2876d08 | 2257 | /** |
79a9becd AC |
2258 | * gpiod_get_raw_value() - return a gpio's raw value |
2259 | * @desc: gpio whose value will be returned | |
d2876d08 | 2260 | * |
79a9becd | 2261 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 2262 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2263 | * |
2264 | * This function should be called from contexts where we cannot sleep, and will | |
2265 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2266 | */ |
79a9becd | 2267 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 2268 | { |
fdeb8e15 | 2269 | VALIDATE_DESC(desc); |
e4e449e8 | 2270 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2271 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 2272 | return _gpiod_get_raw_value(desc); |
d2876d08 | 2273 | } |
79a9becd | 2274 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 2275 | |
79a9becd AC |
2276 | /** |
2277 | * gpiod_get_value() - return a gpio's value | |
2278 | * @desc: gpio whose value will be returned | |
2279 | * | |
2280 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2281 | * account, or negative errno on failure. |
79a9becd AC |
2282 | * |
2283 | * This function should be called from contexts where we cannot sleep, and will | |
2284 | * complain if the GPIO chip functions potentially sleep. | |
2285 | */ | |
2286 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 2287 | { |
79a9becd | 2288 | int value; |
fdeb8e15 LW |
2289 | |
2290 | VALIDATE_DESC(desc); | |
79a9becd | 2291 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2292 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
2293 | |
2294 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
2295 | if (value < 0) |
2296 | return value; | |
2297 | ||
79a9becd AC |
2298 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2299 | value = !value; | |
2300 | ||
2301 | return value; | |
372e722e | 2302 | } |
79a9becd | 2303 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 2304 | |
aca5ce14 LD |
2305 | /* |
2306 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. | |
79a9becd | 2307 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 2308 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 2309 | */ |
23600969 | 2310 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
2311 | { |
2312 | int err = 0; | |
fdeb8e15 | 2313 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2314 | int offset = gpio_chip_hwgpio(desc); |
2315 | ||
aca5ce14 | 2316 | if (value) { |
372e722e | 2317 | err = chip->direction_input(chip, offset); |
aca5ce14 | 2318 | if (!err) |
372e722e | 2319 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2320 | } else { |
372e722e | 2321 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 2322 | if (!err) |
372e722e | 2323 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2324 | } |
372e722e | 2325 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 2326 | if (err < 0) |
6424de5a MB |
2327 | gpiod_err(desc, |
2328 | "%s: Error in set_value for open drain err %d\n", | |
2329 | __func__, err); | |
aca5ce14 LD |
2330 | } |
2331 | ||
25553ff0 | 2332 | /* |
79a9becd AC |
2333 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
2334 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 2335 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 2336 | */ |
23600969 | 2337 | static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value) |
25553ff0 LD |
2338 | { |
2339 | int err = 0; | |
fdeb8e15 | 2340 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2341 | int offset = gpio_chip_hwgpio(desc); |
2342 | ||
25553ff0 | 2343 | if (value) { |
372e722e | 2344 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 2345 | if (!err) |
372e722e | 2346 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2347 | } else { |
372e722e | 2348 | err = chip->direction_input(chip, offset); |
25553ff0 | 2349 | if (!err) |
372e722e | 2350 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2351 | } |
372e722e | 2352 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 2353 | if (err < 0) |
6424de5a MB |
2354 | gpiod_err(desc, |
2355 | "%s: Error in set_value for open source err %d\n", | |
2356 | __func__, err); | |
25553ff0 LD |
2357 | } |
2358 | ||
23600969 | 2359 | static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value) |
d2876d08 DB |
2360 | { |
2361 | struct gpio_chip *chip; | |
2362 | ||
fdeb8e15 | 2363 | chip = desc->gdev->chip; |
372e722e AC |
2364 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
2365 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
2366 | _gpio_set_open_drain_value(desc, value); | |
2367 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
2368 | _gpio_set_open_source_value(desc, value); | |
aca5ce14 | 2369 | else |
372e722e AC |
2370 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
2371 | } | |
2372 | ||
5f424243 RI |
2373 | /* |
2374 | * set multiple outputs on the same chip; | |
2375 | * use the chip's set_multiple function if available; | |
2376 | * otherwise set the outputs sequentially; | |
2377 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
2378 | * defines which outputs are to be changed | |
2379 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
2380 | * defines the values the outputs specified by mask are to be set to | |
2381 | */ | |
2382 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
2383 | unsigned long *mask, unsigned long *bits) | |
2384 | { | |
2385 | if (chip->set_multiple) { | |
2386 | chip->set_multiple(chip, mask, bits); | |
2387 | } else { | |
2388 | int i; | |
2389 | for (i = 0; i < chip->ngpio; i++) { | |
2390 | if (mask[BIT_WORD(i)] == 0) { | |
2391 | /* no more set bits in this mask word; | |
2392 | * skip ahead to the next word */ | |
2393 | i = (BIT_WORD(i) + 1) * BITS_PER_LONG - 1; | |
2394 | continue; | |
2395 | } | |
2396 | /* set outputs if the corresponding mask bit is set */ | |
38e003f4 | 2397 | if (__test_and_clear_bit(i, mask)) |
5f424243 | 2398 | chip->set(chip, i, test_bit(i, bits)); |
5f424243 RI |
2399 | } |
2400 | } | |
2401 | } | |
2402 | ||
44c7288f LW |
2403 | void gpiod_set_array_value_complex(bool raw, bool can_sleep, |
2404 | unsigned int array_size, | |
2405 | struct gpio_desc **desc_array, | |
2406 | int *value_array) | |
5f424243 RI |
2407 | { |
2408 | int i = 0; | |
2409 | ||
2410 | while (i < array_size) { | |
fdeb8e15 | 2411 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
5f424243 RI |
2412 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; |
2413 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
2414 | int count = 0; | |
2415 | ||
38e003f4 | 2416 | if (!can_sleep) |
5f424243 | 2417 | WARN_ON(chip->can_sleep); |
38e003f4 | 2418 | |
5f424243 RI |
2419 | memset(mask, 0, sizeof(mask)); |
2420 | do { | |
2421 | struct gpio_desc *desc = desc_array[i]; | |
2422 | int hwgpio = gpio_chip_hwgpio(desc); | |
2423 | int value = value_array[i]; | |
2424 | ||
2425 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2426 | value = !value; | |
2427 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
2428 | /* | |
2429 | * collect all normal outputs belonging to the same chip | |
2430 | * open drain and open source outputs are set individually | |
2431 | */ | |
2432 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
38e003f4 | 2433 | _gpio_set_open_drain_value(desc, value); |
5f424243 RI |
2434 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
2435 | _gpio_set_open_source_value(desc, value); | |
2436 | } else { | |
2437 | __set_bit(hwgpio, mask); | |
38e003f4 | 2438 | if (value) |
5f424243 | 2439 | __set_bit(hwgpio, bits); |
38e003f4 | 2440 | else |
5f424243 | 2441 | __clear_bit(hwgpio, bits); |
5f424243 RI |
2442 | count++; |
2443 | } | |
2444 | i++; | |
fdeb8e15 LW |
2445 | } while ((i < array_size) && |
2446 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 2447 | /* push collected bits to outputs */ |
38e003f4 | 2448 | if (count != 0) |
5f424243 | 2449 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
2450 | } |
2451 | } | |
2452 | ||
d2876d08 | 2453 | /** |
79a9becd AC |
2454 | * gpiod_set_raw_value() - assign a gpio's raw value |
2455 | * @desc: gpio whose value will be assigned | |
d2876d08 | 2456 | * @value: value to assign |
d2876d08 | 2457 | * |
79a9becd AC |
2458 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
2459 | * regard for its ACTIVE_LOW status. | |
2460 | * | |
2461 | * This function should be called from contexts where we cannot sleep, and will | |
2462 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2463 | */ |
79a9becd | 2464 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 2465 | { |
fdeb8e15 | 2466 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 2467 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 2468 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 2469 | _gpiod_set_raw_value(desc, value); |
d2876d08 | 2470 | } |
79a9becd | 2471 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
2472 | |
2473 | /** | |
79a9becd AC |
2474 | * gpiod_set_value() - assign a gpio's value |
2475 | * @desc: gpio whose value will be assigned | |
2476 | * @value: value to assign | |
2477 | * | |
2478 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2479 | * account | |
d2876d08 | 2480 | * |
79a9becd AC |
2481 | * This function should be called from contexts where we cannot sleep, and will |
2482 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2483 | */ |
79a9becd | 2484 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 2485 | { |
fdeb8e15 | 2486 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 2487 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 2488 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
2489 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2490 | value = !value; | |
2491 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2492 | } |
79a9becd | 2493 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 2494 | |
5f424243 | 2495 | /** |
3fff99bc | 2496 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2497 | * @array_size: number of elements in the descriptor / value arrays |
2498 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2499 | * @value_array: array of values to assign | |
2500 | * | |
2501 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2502 | * without regard for their ACTIVE_LOW status. | |
2503 | * | |
2504 | * This function should be called from contexts where we cannot sleep, and will | |
2505 | * complain if the GPIO chip functions potentially sleep. | |
2506 | */ | |
3fff99bc | 2507 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
2508 | struct gpio_desc **desc_array, int *value_array) |
2509 | { | |
2510 | if (!desc_array) | |
2511 | return; | |
44c7288f LW |
2512 | gpiod_set_array_value_complex(true, false, array_size, desc_array, |
2513 | value_array); | |
5f424243 | 2514 | } |
3fff99bc | 2515 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
2516 | |
2517 | /** | |
3fff99bc | 2518 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2519 | * @array_size: number of elements in the descriptor / value arrays |
2520 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2521 | * @value_array: array of values to assign | |
2522 | * | |
2523 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2524 | * into account. | |
2525 | * | |
2526 | * This function should be called from contexts where we cannot sleep, and will | |
2527 | * complain if the GPIO chip functions potentially sleep. | |
2528 | */ | |
3fff99bc RI |
2529 | void gpiod_set_array_value(unsigned int array_size, |
2530 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
2531 | { |
2532 | if (!desc_array) | |
2533 | return; | |
44c7288f LW |
2534 | gpiod_set_array_value_complex(false, false, array_size, desc_array, |
2535 | value_array); | |
5f424243 | 2536 | } |
3fff99bc | 2537 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 2538 | |
d2876d08 | 2539 | /** |
79a9becd AC |
2540 | * gpiod_cansleep() - report whether gpio value access may sleep |
2541 | * @desc: gpio to check | |
d2876d08 | 2542 | * |
d2876d08 | 2543 | */ |
79a9becd | 2544 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 2545 | { |
fdeb8e15 LW |
2546 | VALIDATE_DESC(desc); |
2547 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 2548 | } |
79a9becd | 2549 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 2550 | |
0f6d504e | 2551 | /** |
79a9becd AC |
2552 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
2553 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 2554 | * |
79a9becd AC |
2555 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
2556 | * error. | |
0f6d504e | 2557 | */ |
79a9becd | 2558 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 2559 | { |
4c37ce86 LW |
2560 | struct gpio_chip *chip; |
2561 | int offset; | |
0f6d504e | 2562 | |
79bb71bd LW |
2563 | /* |
2564 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics | |
2565 | * requires this function to not return zero on an invalid descriptor | |
2566 | * but rather a negative error number. | |
2567 | */ | |
bfbbe44d | 2568 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
79bb71bd LW |
2569 | return -EINVAL; |
2570 | ||
fdeb8e15 | 2571 | chip = desc->gdev->chip; |
372e722e | 2572 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
2573 | if (chip->to_irq) { |
2574 | int retirq = chip->to_irq(chip, offset); | |
2575 | ||
2576 | /* Zero means NO_IRQ */ | |
2577 | if (!retirq) | |
2578 | return -ENXIO; | |
2579 | ||
2580 | return retirq; | |
2581 | } | |
2582 | return -ENXIO; | |
0f6d504e | 2583 | } |
79a9becd | 2584 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 2585 | |
d468bf9e | 2586 | /** |
e3a2e878 | 2587 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
2588 | * @chip: the chip the GPIO to lock belongs to |
2589 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2590 | * |
2591 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 2592 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 2593 | */ |
e3a2e878 | 2594 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 2595 | { |
9c10280d LW |
2596 | struct gpio_desc *desc; |
2597 | ||
2598 | desc = gpiochip_get_desc(chip, offset); | |
2599 | if (IS_ERR(desc)) | |
2600 | return PTR_ERR(desc); | |
2601 | ||
2602 | /* Flush direction if something changed behind our back */ | |
2603 | if (chip->get_direction) { | |
2604 | int dir = chip->get_direction(chip, offset); | |
2605 | ||
2606 | if (dir) | |
2607 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
2608 | else | |
2609 | set_bit(FLAG_IS_OUT, &desc->flags); | |
2610 | } | |
d468bf9e | 2611 | |
9c10280d | 2612 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
d74be6df | 2613 | chip_err(chip, |
d468bf9e LW |
2614 | "%s: tried to flag a GPIO set as output for IRQ\n", |
2615 | __func__); | |
2616 | return -EIO; | |
2617 | } | |
2618 | ||
9c10280d | 2619 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
d468bf9e | 2620 | return 0; |
372e722e | 2621 | } |
e3a2e878 | 2622 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 2623 | |
d468bf9e | 2624 | /** |
e3a2e878 | 2625 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
2626 | * @chip: the chip the GPIO to lock belongs to |
2627 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2628 | * |
2629 | * This is used directly by GPIO drivers that want to indicate | |
2630 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 2631 | */ |
e3a2e878 | 2632 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 2633 | { |
d74be6df | 2634 | if (offset >= chip->ngpio) |
d468bf9e | 2635 | return; |
d2876d08 | 2636 | |
1c3cdb18 | 2637 | clear_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
d468bf9e | 2638 | } |
e3a2e878 | 2639 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 2640 | |
6cee3821 LW |
2641 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
2642 | { | |
2643 | if (offset >= chip->ngpio) | |
2644 | return false; | |
2645 | ||
2646 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
2647 | } | |
2648 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
2649 | ||
143b65d6 LW |
2650 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
2651 | { | |
2652 | if (offset >= chip->ngpio) | |
2653 | return false; | |
2654 | ||
2655 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
2656 | } | |
2657 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
2658 | ||
2659 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
2660 | { | |
2661 | if (offset >= chip->ngpio) | |
2662 | return false; | |
2663 | ||
2664 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
2665 | } | |
2666 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
2667 | ||
79a9becd AC |
2668 | /** |
2669 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
2670 | * @desc: gpio whose value will be returned | |
2671 | * | |
2672 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 2673 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2674 | * |
2675 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 2676 | */ |
79a9becd | 2677 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 2678 | { |
d2876d08 | 2679 | might_sleep_if(extra_checks); |
fdeb8e15 | 2680 | VALIDATE_DESC(desc); |
79a9becd | 2681 | return _gpiod_get_raw_value(desc); |
d2876d08 | 2682 | } |
79a9becd | 2683 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 2684 | |
79a9becd AC |
2685 | /** |
2686 | * gpiod_get_value_cansleep() - return a gpio's value | |
2687 | * @desc: gpio whose value will be returned | |
2688 | * | |
2689 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2690 | * account, or negative errno on failure. |
79a9becd AC |
2691 | * |
2692 | * This function is to be called from contexts that can sleep. | |
2693 | */ | |
2694 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 2695 | { |
3f397c21 | 2696 | int value; |
d2876d08 DB |
2697 | |
2698 | might_sleep_if(extra_checks); | |
fdeb8e15 | 2699 | VALIDATE_DESC(desc); |
79a9becd | 2700 | value = _gpiod_get_raw_value(desc); |
e20538b8 BA |
2701 | if (value < 0) |
2702 | return value; | |
2703 | ||
79a9becd AC |
2704 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2705 | value = !value; | |
2706 | ||
3f397c21 | 2707 | return value; |
d2876d08 | 2708 | } |
79a9becd | 2709 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 2710 | |
79a9becd AC |
2711 | /** |
2712 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
2713 | * @desc: gpio whose value will be assigned | |
2714 | * @value: value to assign | |
2715 | * | |
2716 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
2717 | * regard for its ACTIVE_LOW status. | |
2718 | * | |
2719 | * This function is to be called from contexts that can sleep. | |
2720 | */ | |
2721 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 2722 | { |
d2876d08 | 2723 | might_sleep_if(extra_checks); |
fdeb8e15 | 2724 | VALIDATE_DESC_VOID(desc); |
79a9becd | 2725 | _gpiod_set_raw_value(desc, value); |
372e722e | 2726 | } |
79a9becd | 2727 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 2728 | |
79a9becd AC |
2729 | /** |
2730 | * gpiod_set_value_cansleep() - assign a gpio's value | |
2731 | * @desc: gpio whose value will be assigned | |
2732 | * @value: value to assign | |
2733 | * | |
2734 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2735 | * account | |
2736 | * | |
2737 | * This function is to be called from contexts that can sleep. | |
2738 | */ | |
2739 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 2740 | { |
d2876d08 | 2741 | might_sleep_if(extra_checks); |
fdeb8e15 | 2742 | VALIDATE_DESC_VOID(desc); |
79a9becd AC |
2743 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2744 | value = !value; | |
2745 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2746 | } |
79a9becd | 2747 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 2748 | |
5f424243 | 2749 | /** |
3fff99bc | 2750 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2751 | * @array_size: number of elements in the descriptor / value arrays |
2752 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2753 | * @value_array: array of values to assign | |
2754 | * | |
2755 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2756 | * without regard for their ACTIVE_LOW status. | |
2757 | * | |
2758 | * This function is to be called from contexts that can sleep. | |
2759 | */ | |
3fff99bc RI |
2760 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
2761 | struct gpio_desc **desc_array, | |
2762 | int *value_array) | |
5f424243 RI |
2763 | { |
2764 | might_sleep_if(extra_checks); | |
2765 | if (!desc_array) | |
2766 | return; | |
44c7288f LW |
2767 | gpiod_set_array_value_complex(true, true, array_size, desc_array, |
2768 | value_array); | |
5f424243 | 2769 | } |
3fff99bc | 2770 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 RI |
2771 | |
2772 | /** | |
3fff99bc | 2773 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2774 | * @array_size: number of elements in the descriptor / value arrays |
2775 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2776 | * @value_array: array of values to assign | |
2777 | * | |
2778 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2779 | * into account. | |
2780 | * | |
2781 | * This function is to be called from contexts that can sleep. | |
2782 | */ | |
3fff99bc RI |
2783 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
2784 | struct gpio_desc **desc_array, | |
2785 | int *value_array) | |
5f424243 RI |
2786 | { |
2787 | might_sleep_if(extra_checks); | |
2788 | if (!desc_array) | |
2789 | return; | |
44c7288f LW |
2790 | gpiod_set_array_value_complex(false, true, array_size, desc_array, |
2791 | value_array); | |
5f424243 | 2792 | } |
3fff99bc | 2793 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 2794 | |
bae48da2 | 2795 | /** |
ad824783 AC |
2796 | * gpiod_add_lookup_table() - register GPIO device consumers |
2797 | * @table: table of consumers to register | |
bae48da2 | 2798 | */ |
ad824783 | 2799 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
2800 | { |
2801 | mutex_lock(&gpio_lookup_lock); | |
2802 | ||
ad824783 | 2803 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
2804 | |
2805 | mutex_unlock(&gpio_lookup_lock); | |
2806 | } | |
2807 | ||
be9015ab SK |
2808 | /** |
2809 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
2810 | * @table: table of consumers to unregister | |
2811 | */ | |
2812 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
2813 | { | |
2814 | mutex_lock(&gpio_lookup_lock); | |
2815 | ||
2816 | list_del(&table->list); | |
2817 | ||
2818 | mutex_unlock(&gpio_lookup_lock); | |
2819 | } | |
2820 | ||
bae48da2 | 2821 | static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
2822 | unsigned int idx, |
2823 | enum gpio_lookup_flags *flags) | |
bae48da2 AC |
2824 | { |
2825 | char prop_name[32]; /* 32 is max size of property name */ | |
2826 | enum of_gpio_flags of_flags; | |
2827 | struct gpio_desc *desc; | |
dd34c37a | 2828 | unsigned int i; |
bae48da2 | 2829 | |
7f2e553a | 2830 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
dd34c37a | 2831 | if (con_id) |
9e089246 | 2832 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, |
7f2e553a | 2833 | gpio_suffixes[i]); |
dd34c37a | 2834 | else |
9e089246 | 2835 | snprintf(prop_name, sizeof(prop_name), "%s", |
7f2e553a | 2836 | gpio_suffixes[i]); |
bae48da2 | 2837 | |
dd34c37a TR |
2838 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, |
2839 | &of_flags); | |
da17f8a1 | 2840 | if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT)) |
dd34c37a TR |
2841 | break; |
2842 | } | |
bae48da2 AC |
2843 | |
2844 | if (IS_ERR(desc)) | |
2845 | return desc; | |
2846 | ||
2847 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
53e7cac3 | 2848 | *flags |= GPIO_ACTIVE_LOW; |
bae48da2 | 2849 | |
90b665f6 LP |
2850 | if (of_flags & OF_GPIO_SINGLE_ENDED) { |
2851 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
2852 | *flags |= GPIO_OPEN_DRAIN; | |
2853 | else | |
2854 | *flags |= GPIO_OPEN_SOURCE; | |
2855 | } | |
2856 | ||
bae48da2 AC |
2857 | return desc; |
2858 | } | |
d2876d08 | 2859 | |
25487533 DT |
2860 | static struct gpio_desc *acpi_find_gpio(struct device *dev, |
2861 | const char *con_id, | |
53e7cac3 | 2862 | unsigned int idx, |
25487533 DT |
2863 | enum gpiod_flags flags, |
2864 | enum gpio_lookup_flags *lookupflags) | |
372e722e | 2865 | { |
0d9a693c | 2866 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e01f440a MW |
2867 | struct acpi_gpio_info info; |
2868 | struct gpio_desc *desc; | |
0d9a693c MW |
2869 | char propname[32]; |
2870 | int i; | |
e01f440a | 2871 | |
0d9a693c | 2872 | /* Try first from _DSD */ |
7f2e553a | 2873 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
0d9a693c MW |
2874 | if (con_id && strcmp(con_id, "gpios")) { |
2875 | snprintf(propname, sizeof(propname), "%s-%s", | |
7f2e553a | 2876 | con_id, gpio_suffixes[i]); |
0d9a693c MW |
2877 | } else { |
2878 | snprintf(propname, sizeof(propname), "%s", | |
7f2e553a | 2879 | gpio_suffixes[i]); |
0d9a693c MW |
2880 | } |
2881 | ||
2882 | desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); | |
2883 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) | |
2884 | break; | |
2885 | } | |
2886 | ||
2887 | /* Then from plain _CRS GPIOs */ | |
2888 | if (IS_ERR(desc)) { | |
10cf4899 DT |
2889 | if (!acpi_can_fallback_to_crs(adev, con_id)) |
2890 | return ERR_PTR(-ENOENT); | |
2891 | ||
0d9a693c MW |
2892 | desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); |
2893 | if (IS_ERR(desc)) | |
2894 | return desc; | |
25487533 DT |
2895 | |
2896 | if ((flags == GPIOD_OUT_LOW || flags == GPIOD_OUT_HIGH) && | |
2897 | info.gpioint) { | |
2898 | dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n"); | |
2899 | return ERR_PTR(-ENOENT); | |
2900 | } | |
0d9a693c | 2901 | } |
e01f440a | 2902 | |
52044723 | 2903 | if (info.polarity == GPIO_ACTIVE_LOW) |
25487533 | 2904 | *lookupflags |= GPIO_ACTIVE_LOW; |
e01f440a MW |
2905 | |
2906 | return desc; | |
81f59e9d MW |
2907 | } |
2908 | ||
ad824783 | 2909 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
2910 | { |
2911 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 2912 | struct gpiod_lookup_table *table; |
bae48da2 AC |
2913 | |
2914 | mutex_lock(&gpio_lookup_lock); | |
2915 | ||
ad824783 AC |
2916 | list_for_each_entry(table, &gpio_lookup_list, list) { |
2917 | if (table->dev_id && dev_id) { | |
2918 | /* | |
2919 | * Valid strings on both ends, must be identical to have | |
2920 | * a match | |
2921 | */ | |
2922 | if (!strcmp(table->dev_id, dev_id)) | |
2923 | goto found; | |
2924 | } else { | |
2925 | /* | |
2926 | * One of the pointers is NULL, so both must be to have | |
2927 | * a match | |
2928 | */ | |
2929 | if (dev_id == table->dev_id) | |
2930 | goto found; | |
2931 | } | |
2932 | } | |
2933 | table = NULL; | |
bae48da2 | 2934 | |
ad824783 AC |
2935 | found: |
2936 | mutex_unlock(&gpio_lookup_lock); | |
2937 | return table; | |
2938 | } | |
bae48da2 | 2939 | |
ad824783 AC |
2940 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
2941 | unsigned int idx, | |
2942 | enum gpio_lookup_flags *flags) | |
2943 | { | |
2a3cf6a3 | 2944 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
2945 | struct gpiod_lookup_table *table; |
2946 | struct gpiod_lookup *p; | |
bae48da2 | 2947 | |
ad824783 AC |
2948 | table = gpiod_find_lookup_table(dev); |
2949 | if (!table) | |
2950 | return desc; | |
bae48da2 | 2951 | |
ad824783 AC |
2952 | for (p = &table->table[0]; p->chip_label; p++) { |
2953 | struct gpio_chip *chip; | |
bae48da2 | 2954 | |
ad824783 | 2955 | /* idx must always match exactly */ |
bae48da2 AC |
2956 | if (p->idx != idx) |
2957 | continue; | |
2958 | ||
ad824783 AC |
2959 | /* If the lookup entry has a con_id, require exact match */ |
2960 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
2961 | continue; | |
bae48da2 | 2962 | |
ad824783 | 2963 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 2964 | |
ad824783 | 2965 | if (!chip) { |
2a3cf6a3 AC |
2966 | dev_err(dev, "cannot find GPIO chip %s\n", |
2967 | p->chip_label); | |
2968 | return ERR_PTR(-ENODEV); | |
ad824783 | 2969 | } |
bae48da2 | 2970 | |
ad824783 | 2971 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
2972 | dev_err(dev, |
2973 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
2974 | idx, chip->ngpio, chip->label); | |
2975 | return ERR_PTR(-EINVAL); | |
bae48da2 | 2976 | } |
bae48da2 | 2977 | |
bb1e88cc | 2978 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 2979 | *flags = p->flags; |
bae48da2 | 2980 | |
2a3cf6a3 | 2981 | return desc; |
bae48da2 AC |
2982 | } |
2983 | ||
bae48da2 AC |
2984 | return desc; |
2985 | } | |
2986 | ||
66858527 RI |
2987 | static int dt_gpio_count(struct device *dev, const char *con_id) |
2988 | { | |
2989 | int ret; | |
2990 | char propname[32]; | |
2991 | unsigned int i; | |
2992 | ||
2993 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
2994 | if (con_id) | |
2995 | snprintf(propname, sizeof(propname), "%s-%s", | |
2996 | con_id, gpio_suffixes[i]); | |
2997 | else | |
2998 | snprintf(propname, sizeof(propname), "%s", | |
2999 | gpio_suffixes[i]); | |
3000 | ||
3001 | ret = of_gpio_named_count(dev->of_node, propname); | |
3002 | if (ret >= 0) | |
3003 | break; | |
3004 | } | |
3005 | return ret; | |
3006 | } | |
3007 | ||
3008 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
3009 | { | |
3010 | struct gpiod_lookup_table *table; | |
3011 | struct gpiod_lookup *p; | |
3012 | unsigned int count = 0; | |
3013 | ||
3014 | table = gpiod_find_lookup_table(dev); | |
3015 | if (!table) | |
3016 | return -ENOENT; | |
3017 | ||
3018 | for (p = &table->table[0]; p->chip_label; p++) { | |
3019 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
3020 | (!con_id && !p->con_id)) | |
3021 | count++; | |
3022 | } | |
3023 | if (!count) | |
3024 | return -ENOENT; | |
3025 | ||
3026 | return count; | |
3027 | } | |
3028 | ||
3029 | /** | |
3030 | * gpiod_count - return the number of GPIOs associated with a device / function | |
3031 | * or -ENOENT if no GPIO has been assigned to the requested function | |
3032 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3033 | * @con_id: function within the GPIO consumer | |
3034 | */ | |
3035 | int gpiod_count(struct device *dev, const char *con_id) | |
3036 | { | |
3037 | int count = -ENOENT; | |
3038 | ||
3039 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
3040 | count = dt_gpio_count(dev, con_id); | |
3041 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
3042 | count = acpi_gpio_count(dev, con_id); | |
3043 | ||
3044 | if (count < 0) | |
3045 | count = platform_gpio_count(dev, con_id); | |
3046 | ||
3047 | return count; | |
3048 | } | |
3049 | EXPORT_SYMBOL_GPL(gpiod_count); | |
3050 | ||
bae48da2 | 3051 | /** |
0879162f | 3052 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 3053 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 3054 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 3055 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3056 | * |
3057 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 3058 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 3059 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 3060 | */ |
b17d1bf1 | 3061 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 3062 | enum gpiod_flags flags) |
bae48da2 | 3063 | { |
39b2bbe3 | 3064 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 3065 | } |
b17d1bf1 | 3066 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 3067 | |
29a1f233 TR |
3068 | /** |
3069 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
3070 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3071 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 3072 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3073 | * |
3074 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
3075 | * the requested function it will return NULL. This is convenient for drivers | |
3076 | * that need to handle optional GPIOs. | |
3077 | */ | |
b17d1bf1 | 3078 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
3079 | const char *con_id, |
3080 | enum gpiod_flags flags) | |
29a1f233 | 3081 | { |
39b2bbe3 | 3082 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 3083 | } |
b17d1bf1 | 3084 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 3085 | |
f625d460 BP |
3086 | |
3087 | /** | |
3088 | * gpiod_configure_flags - helper function to configure a given GPIO | |
3089 | * @desc: gpio whose value will be assigned | |
3090 | * @con_id: function within the GPIO consumer | |
85b03b30 JH |
3091 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
3092 | * of_get_gpio_hog() | |
f625d460 BP |
3093 | * @dflags: gpiod_flags - optional GPIO initialization flags |
3094 | * | |
3095 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
3096 | * requested function and/or index, or another IS_ERR() code if an error | |
3097 | * occurred while trying to acquire the GPIO. | |
3098 | */ | |
3099 | static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, | |
85b03b30 | 3100 | unsigned long lflags, enum gpiod_flags dflags) |
f625d460 BP |
3101 | { |
3102 | int status; | |
3103 | ||
85b03b30 JH |
3104 | if (lflags & GPIO_ACTIVE_LOW) |
3105 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
3106 | if (lflags & GPIO_OPEN_DRAIN) | |
3107 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
3108 | if (lflags & GPIO_OPEN_SOURCE) | |
3109 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
3110 | ||
f625d460 BP |
3111 | /* No particular flag request, return here... */ |
3112 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
3113 | pr_debug("no flags found for %s\n", con_id); | |
3114 | return 0; | |
3115 | } | |
3116 | ||
3117 | /* Process flags */ | |
3118 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
3119 | status = gpiod_direction_output(desc, | |
3120 | dflags & GPIOD_FLAGS_BIT_DIR_VAL); | |
3121 | else | |
3122 | status = gpiod_direction_input(desc); | |
3123 | ||
3124 | return status; | |
3125 | } | |
3126 | ||
bae48da2 AC |
3127 | /** |
3128 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 3129 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
3130 | * @con_id: function within the GPIO consumer |
3131 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3132 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3133 | * |
3134 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
3135 | * defined one for functions that define several GPIOs. | |
3136 | * | |
2a3cf6a3 AC |
3137 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
3138 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 3139 | * occurred while trying to acquire the GPIO. |
bae48da2 | 3140 | */ |
b17d1bf1 | 3141 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 3142 | const char *con_id, |
39b2bbe3 AC |
3143 | unsigned int idx, |
3144 | enum gpiod_flags flags) | |
bae48da2 | 3145 | { |
35c5d7fd | 3146 | struct gpio_desc *desc = NULL; |
bae48da2 | 3147 | int status; |
39b2bbe3 | 3148 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
3149 | |
3150 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
3151 | ||
4d8440b9 RW |
3152 | if (dev) { |
3153 | /* Using device tree? */ | |
3154 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
3155 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
3156 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
3157 | } else if (ACPI_COMPANION(dev)) { | |
3158 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
25487533 | 3159 | desc = acpi_find_gpio(dev, con_id, idx, flags, &lookupflags); |
4d8440b9 | 3160 | } |
35c5d7fd AC |
3161 | } |
3162 | ||
3163 | /* | |
3164 | * Either we are not using DT or ACPI, or their lookup did not return | |
3165 | * a result. In that case, use platform lookup as a fallback. | |
3166 | */ | |
2a3cf6a3 | 3167 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 3168 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 3169 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
3170 | } |
3171 | ||
3172 | if (IS_ERR(desc)) { | |
351cfe0f | 3173 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
3174 | return desc; |
3175 | } | |
3176 | ||
3177 | status = gpiod_request(desc, con_id); | |
bae48da2 AC |
3178 | if (status < 0) |
3179 | return ERR_PTR(status); | |
3180 | ||
85b03b30 | 3181 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
3182 | if (status < 0) { |
3183 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
3184 | gpiod_put(desc); | |
3185 | return ERR_PTR(status); | |
3186 | } | |
3187 | ||
bae48da2 AC |
3188 | return desc; |
3189 | } | |
b17d1bf1 | 3190 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 3191 | |
40b73183 MW |
3192 | /** |
3193 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
3194 | * @fwnode: handle of the firmware node | |
3195 | * @propname: name of the firmware property representing the GPIO | |
3196 | * | |
3197 | * This function can be used for drivers that get their configuration | |
3198 | * from firmware. | |
3199 | * | |
3200 | * Function properly finds the corresponding GPIO using whatever is the | |
3201 | * underlying firmware interface and then makes sure that the GPIO | |
3202 | * descriptor is requested before it is returned to the caller. | |
3203 | * | |
3204 | * In case of error an ERR_PTR() is returned. | |
3205 | */ | |
3206 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
3207 | const char *propname) | |
3208 | { | |
3209 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
3210 | bool active_low = false; | |
90b665f6 | 3211 | bool single_ended = false; |
40b73183 MW |
3212 | int ret; |
3213 | ||
3214 | if (!fwnode) | |
3215 | return ERR_PTR(-EINVAL); | |
3216 | ||
3217 | if (is_of_node(fwnode)) { | |
3218 | enum of_gpio_flags flags; | |
3219 | ||
c181fb3e | 3220 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0, |
40b73183 | 3221 | &flags); |
90b665f6 | 3222 | if (!IS_ERR(desc)) { |
40b73183 | 3223 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
90b665f6 LP |
3224 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
3225 | } | |
40b73183 MW |
3226 | } else if (is_acpi_node(fwnode)) { |
3227 | struct acpi_gpio_info info; | |
3228 | ||
504a3374 | 3229 | desc = acpi_node_get_gpiod(fwnode, propname, 0, &info); |
40b73183 | 3230 | if (!IS_ERR(desc)) |
52044723 | 3231 | active_low = info.polarity == GPIO_ACTIVE_LOW; |
40b73183 MW |
3232 | } |
3233 | ||
3234 | if (IS_ERR(desc)) | |
3235 | return desc; | |
3236 | ||
85b03b30 JH |
3237 | ret = gpiod_request(desc, NULL); |
3238 | if (ret) | |
3239 | return ERR_PTR(ret); | |
3240 | ||
40b73183 MW |
3241 | if (active_low) |
3242 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
3243 | ||
90b665f6 LP |
3244 | if (single_ended) { |
3245 | if (active_low) | |
3246 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
3247 | else | |
3248 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
3249 | } | |
3250 | ||
40b73183 MW |
3251 | return desc; |
3252 | } | |
3253 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
3254 | ||
29a1f233 TR |
3255 | /** |
3256 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
3257 | * function | |
3258 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3259 | * @con_id: function within the GPIO consumer | |
3260 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3261 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3262 | * |
3263 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
3264 | * specified index was assigned to the requested function it will return NULL. | |
3265 | * This is convenient for drivers that need to handle optional GPIOs. | |
3266 | */ | |
b17d1bf1 | 3267 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 3268 | const char *con_id, |
39b2bbe3 AC |
3269 | unsigned int index, |
3270 | enum gpiod_flags flags) | |
29a1f233 TR |
3271 | { |
3272 | struct gpio_desc *desc; | |
3273 | ||
39b2bbe3 | 3274 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
3275 | if (IS_ERR(desc)) { |
3276 | if (PTR_ERR(desc) == -ENOENT) | |
3277 | return NULL; | |
3278 | } | |
3279 | ||
3280 | return desc; | |
3281 | } | |
b17d1bf1 | 3282 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 3283 | |
f625d460 BP |
3284 | /** |
3285 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
3286 | * @desc: gpio whose value will be assigned | |
3287 | * @name: gpio line name | |
3288 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
3289 | * of_get_gpio_hog() | |
3290 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
3291 | */ | |
3292 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
3293 | unsigned long lflags, enum gpiod_flags dflags) | |
3294 | { | |
3295 | struct gpio_chip *chip; | |
3296 | struct gpio_desc *local_desc; | |
3297 | int hwnum; | |
3298 | int status; | |
3299 | ||
3300 | chip = gpiod_to_chip(desc); | |
3301 | hwnum = gpio_chip_hwgpio(desc); | |
3302 | ||
3303 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); | |
3304 | if (IS_ERR(local_desc)) { | |
c31a571d LD |
3305 | status = PTR_ERR(local_desc); |
3306 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
3307 | name, chip->label, hwnum, status); | |
3308 | return status; | |
f625d460 BP |
3309 | } |
3310 | ||
85b03b30 | 3311 | status = gpiod_configure_flags(desc, name, lflags, dflags); |
f625d460 | 3312 | if (status < 0) { |
c31a571d LD |
3313 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
3314 | name, chip->label, hwnum, status); | |
f625d460 BP |
3315 | gpiochip_free_own_desc(desc); |
3316 | return status; | |
3317 | } | |
3318 | ||
3319 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
3320 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
3321 | ||
3322 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
3323 | desc_to_gpio(desc), name, | |
3324 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
3325 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
3326 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
3327 | ||
3328 | return 0; | |
3329 | } | |
3330 | ||
3331 | /** | |
3332 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
3333 | * @chip: gpio chip to act on | |
3334 | * | |
3335 | * This is only used by of_gpiochip_remove to free hogged gpios | |
3336 | */ | |
3337 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
3338 | { | |
3339 | int id; | |
3340 | ||
3341 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
3342 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
3343 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
3344 | } |
3345 | } | |
3346 | ||
66858527 RI |
3347 | /** |
3348 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
3349 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3350 | * @con_id: function within the GPIO consumer | |
3351 | * @flags: optional GPIO initialization flags | |
3352 | * | |
3353 | * This function acquires all the GPIOs defined under a given function. | |
3354 | * | |
3355 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
3356 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
3357 | * code if an error occurred while trying to acquire the GPIOs. | |
3358 | */ | |
3359 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
3360 | const char *con_id, | |
3361 | enum gpiod_flags flags) | |
3362 | { | |
3363 | struct gpio_desc *desc; | |
3364 | struct gpio_descs *descs; | |
3365 | int count; | |
3366 | ||
3367 | count = gpiod_count(dev, con_id); | |
3368 | if (count < 0) | |
3369 | return ERR_PTR(count); | |
3370 | ||
3371 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
3372 | GFP_KERNEL); | |
3373 | if (!descs) | |
3374 | return ERR_PTR(-ENOMEM); | |
3375 | ||
3376 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
3377 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
3378 | if (IS_ERR(desc)) { | |
3379 | gpiod_put_array(descs); | |
3380 | return ERR_CAST(desc); | |
3381 | } | |
3382 | descs->desc[descs->ndescs] = desc; | |
3383 | descs->ndescs++; | |
3384 | } | |
3385 | return descs; | |
3386 | } | |
3387 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
3388 | ||
3389 | /** | |
3390 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
3391 | * function | |
3392 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3393 | * @con_id: function within the GPIO consumer | |
3394 | * @flags: optional GPIO initialization flags | |
3395 | * | |
3396 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
3397 | * assigned to the requested function it will return NULL. | |
3398 | */ | |
3399 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
3400 | const char *con_id, | |
3401 | enum gpiod_flags flags) | |
3402 | { | |
3403 | struct gpio_descs *descs; | |
3404 | ||
3405 | descs = gpiod_get_array(dev, con_id, flags); | |
3406 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
3407 | return NULL; | |
3408 | ||
3409 | return descs; | |
3410 | } | |
3411 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
3412 | ||
bae48da2 AC |
3413 | /** |
3414 | * gpiod_put - dispose of a GPIO descriptor | |
3415 | * @desc: GPIO descriptor to dispose of | |
3416 | * | |
3417 | * No descriptor can be used after gpiod_put() has been called on it. | |
3418 | */ | |
3419 | void gpiod_put(struct gpio_desc *desc) | |
3420 | { | |
3421 | gpiod_free(desc); | |
372e722e | 3422 | } |
bae48da2 | 3423 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 3424 | |
66858527 RI |
3425 | /** |
3426 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
3427 | * @descs: struct gpio_descs containing an array of descriptors | |
3428 | */ | |
3429 | void gpiod_put_array(struct gpio_descs *descs) | |
3430 | { | |
3431 | unsigned int i; | |
3432 | ||
3433 | for (i = 0; i < descs->ndescs; i++) | |
3434 | gpiod_put(descs->desc[i]); | |
3435 | ||
3436 | kfree(descs); | |
3437 | } | |
3438 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
3439 | ||
3c702e99 LW |
3440 | static int __init gpiolib_dev_init(void) |
3441 | { | |
3442 | int ret; | |
3443 | ||
3444 | /* Register GPIO sysfs bus */ | |
3445 | ret = bus_register(&gpio_bus_type); | |
3446 | if (ret < 0) { | |
3447 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
3448 | return ret; | |
3449 | } | |
3450 | ||
3451 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
3452 | if (ret < 0) { | |
3453 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
3454 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
3455 | } else { |
3456 | gpiolib_initialized = true; | |
3457 | gpiochip_setup_devs(); | |
3c702e99 LW |
3458 | } |
3459 | return ret; | |
3460 | } | |
3461 | core_initcall(gpiolib_dev_init); | |
3462 | ||
d2876d08 DB |
3463 | #ifdef CONFIG_DEBUG_FS |
3464 | ||
fdeb8e15 | 3465 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
3466 | { |
3467 | unsigned i; | |
fdeb8e15 LW |
3468 | struct gpio_chip *chip = gdev->chip; |
3469 | unsigned gpio = gdev->base; | |
3470 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 3471 | int is_out; |
d468bf9e | 3472 | int is_irq; |
d2876d08 | 3473 | |
fdeb8e15 | 3474 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
3475 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
3476 | if (gdesc->name) { | |
3477 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
3478 | gpio, gdesc->name); | |
3479 | } | |
d2876d08 | 3480 | continue; |
ced433e2 | 3481 | } |
d2876d08 | 3482 | |
372e722e | 3483 | gpiod_get_direction(gdesc); |
d2876d08 | 3484 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 3485 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
3486 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
3487 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
3488 | is_out ? "out" : "in ", |
3489 | chip->get | |
3490 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
3491 | : "? ", |
3492 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
3493 | seq_printf(s, "\n"); |
3494 | } | |
3495 | } | |
3496 | ||
f9c4a31f | 3497 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 3498 | { |
362432ae | 3499 | unsigned long flags; |
ff2b1359 | 3500 | struct gpio_device *gdev = NULL; |
cb1650d4 | 3501 | loff_t index = *pos; |
d2876d08 | 3502 | |
f9c4a31f | 3503 | s->private = ""; |
d2876d08 | 3504 | |
362432ae | 3505 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3506 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
3507 | if (index-- == 0) { |
3508 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 3509 | return gdev; |
f9c4a31f | 3510 | } |
362432ae | 3511 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 3512 | |
cb1650d4 | 3513 | return NULL; |
f9c4a31f TR |
3514 | } |
3515 | ||
3516 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
3517 | { | |
362432ae | 3518 | unsigned long flags; |
ff2b1359 | 3519 | struct gpio_device *gdev = v; |
f9c4a31f TR |
3520 | void *ret = NULL; |
3521 | ||
362432ae | 3522 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3523 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
3524 | ret = NULL; |
3525 | else | |
ff2b1359 | 3526 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 3527 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
3528 | |
3529 | s->private = "\n"; | |
3530 | ++*pos; | |
3531 | ||
3532 | return ret; | |
3533 | } | |
3534 | ||
3535 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
3536 | { | |
3537 | } | |
3538 | ||
3539 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
3540 | { | |
ff2b1359 LW |
3541 | struct gpio_device *gdev = v; |
3542 | struct gpio_chip *chip = gdev->chip; | |
3543 | struct device *parent; | |
3544 | ||
3545 | if (!chip) { | |
3546 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
3547 | dev_name(&gdev->dev)); | |
3548 | return 0; | |
3549 | } | |
f9c4a31f | 3550 | |
ff2b1359 LW |
3551 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
3552 | dev_name(&gdev->dev), | |
fdeb8e15 | 3553 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
3554 | parent = chip->parent; |
3555 | if (parent) | |
3556 | seq_printf(s, ", parent: %s/%s", | |
3557 | parent->bus ? parent->bus->name : "no-bus", | |
3558 | dev_name(parent)); | |
f9c4a31f TR |
3559 | if (chip->label) |
3560 | seq_printf(s, ", %s", chip->label); | |
3561 | if (chip->can_sleep) | |
3562 | seq_printf(s, ", can sleep"); | |
3563 | seq_printf(s, ":\n"); | |
3564 | ||
3565 | if (chip->dbg_show) | |
3566 | chip->dbg_show(s, chip); | |
3567 | else | |
fdeb8e15 | 3568 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 3569 | |
d2876d08 DB |
3570 | return 0; |
3571 | } | |
3572 | ||
f9c4a31f TR |
3573 | static const struct seq_operations gpiolib_seq_ops = { |
3574 | .start = gpiolib_seq_start, | |
3575 | .next = gpiolib_seq_next, | |
3576 | .stop = gpiolib_seq_stop, | |
3577 | .show = gpiolib_seq_show, | |
3578 | }; | |
3579 | ||
d2876d08 DB |
3580 | static int gpiolib_open(struct inode *inode, struct file *file) |
3581 | { | |
f9c4a31f | 3582 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
3583 | } |
3584 | ||
828c0950 | 3585 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 3586 | .owner = THIS_MODULE, |
d2876d08 DB |
3587 | .open = gpiolib_open, |
3588 | .read = seq_read, | |
3589 | .llseek = seq_lseek, | |
f9c4a31f | 3590 | .release = seq_release, |
d2876d08 DB |
3591 | }; |
3592 | ||
3593 | static int __init gpiolib_debugfs_init(void) | |
3594 | { | |
3595 | /* /sys/kernel/debug/gpio */ | |
3596 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
3597 | NULL, NULL, &gpiolib_operations); | |
3598 | return 0; | |
3599 | } | |
3600 | subsys_initcall(gpiolib_debugfs_init); | |
3601 | ||
3602 | #endif /* DEBUG_FS */ |