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> |
ff2b1359 | 19 | #include <linux/idr.h> |
3c702e99 LW |
20 | #include <linux/cdev.h> |
21 | #include <linux/fs.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <uapi/linux/gpio.h> | |
d2876d08 | 24 | |
664e3e5a MW |
25 | #include "gpiolib.h" |
26 | ||
3f397c21 UKK |
27 | #define CREATE_TRACE_POINTS |
28 | #include <trace/events/gpio.h> | |
d2876d08 | 29 | |
79a9becd | 30 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 31 | * |
79a9becd AC |
32 | * The GPIO programming interface allows for inlining speed-critical |
33 | * get/set operations for common cases, so that access to SOC-integrated | |
34 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
35 | */ |
36 | ||
37 | ||
38 | /* When debugging, extend minimal trust to callers and platform code. | |
39 | * Also emit diagnostic messages that may help initial bringup, when | |
40 | * board setup or driver bugs are most common. | |
41 | * | |
42 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
43 | */ | |
44 | #ifdef DEBUG | |
45 | #define extra_checks 1 | |
46 | #else | |
47 | #define extra_checks 0 | |
48 | #endif | |
49 | ||
ff2b1359 LW |
50 | /* Device and char device-related information */ |
51 | static DEFINE_IDA(gpio_ida); | |
3c702e99 LW |
52 | static dev_t gpio_devt; |
53 | #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ | |
54 | static struct bus_type gpio_bus_type = { | |
55 | .name = "gpio", | |
56 | }; | |
ff2b1359 | 57 | |
d2876d08 DB |
58 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
59 | * While any GPIO is requested, its gpio_chip is not removable; | |
60 | * each GPIO's "requested" flag serves as a lock and refcount. | |
61 | */ | |
0eb4c6c2 | 62 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 63 | |
bae48da2 AC |
64 | static DEFINE_MUTEX(gpio_lookup_lock); |
65 | static LIST_HEAD(gpio_lookup_list); | |
ff2b1359 | 66 | LIST_HEAD(gpio_devices); |
6d86750c JH |
67 | |
68 | static void gpiochip_free_hogs(struct gpio_chip *chip); | |
69 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); | |
70 | ||
71 | ||
d2876d08 DB |
72 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
73 | { | |
d2876d08 | 74 | d->label = label; |
d2876d08 DB |
75 | } |
76 | ||
372e722e AC |
77 | /** |
78 | * Convert a GPIO number to its descriptor | |
79 | */ | |
79a9becd | 80 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 81 | { |
ff2b1359 | 82 | struct gpio_device *gdev; |
14e85c0e AC |
83 | unsigned long flags; |
84 | ||
85 | spin_lock_irqsave(&gpio_lock, flags); | |
86 | ||
ff2b1359 | 87 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
88 | if (gdev->base <= gpio && |
89 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 90 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 91 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
92 | } |
93 | } | |
94 | ||
95 | spin_unlock_irqrestore(&gpio_lock, flags); | |
96 | ||
0e9a5edf AC |
97 | if (!gpio_is_valid(gpio)) |
98 | WARN(1, "invalid GPIO %d\n", gpio); | |
99 | ||
14e85c0e | 100 | return NULL; |
372e722e | 101 | } |
79a9becd | 102 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 103 | |
d468bf9e | 104 | /** |
bb1e88cc | 105 | * Get the GPIO descriptor corresponding to the given hw number for this chip. |
d468bf9e | 106 | */ |
bb1e88cc AC |
107 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
108 | u16 hwnum) | |
d468bf9e | 109 | { |
fdeb8e15 LW |
110 | struct gpio_device *gdev = chip->gpiodev; |
111 | ||
112 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 113 | return ERR_PTR(-EINVAL); |
d468bf9e | 114 | |
fdeb8e15 | 115 | return &gdev->descs[hwnum]; |
d468bf9e | 116 | } |
372e722e AC |
117 | |
118 | /** | |
119 | * Convert a GPIO descriptor to the integer namespace. | |
120 | * This should disappear in the future but is needed since we still | |
121 | * use GPIO numbers for error messages and sysfs nodes | |
122 | */ | |
79a9becd | 123 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 124 | { |
fdeb8e15 | 125 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 126 | } |
79a9becd | 127 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
128 | |
129 | ||
79a9becd AC |
130 | /** |
131 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
132 | * @desc: descriptor to return the chip of | |
133 | */ | |
134 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 135 | { |
fdeb8e15 LW |
136 | if (!desc || !desc->gdev || !desc->gdev->chip) |
137 | return NULL; | |
138 | return desc->gdev->chip; | |
372e722e | 139 | } |
79a9becd | 140 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 141 | |
8d0aab2f AV |
142 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
143 | static int gpiochip_find_base(int ngpio) | |
144 | { | |
ff2b1359 | 145 | struct gpio_device *gdev; |
83cabe33 | 146 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 147 | |
ff2b1359 | 148 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 149 | /* found a free space? */ |
fdeb8e15 | 150 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
151 | break; |
152 | else | |
153 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 154 | base = gdev->base - ngpio; |
8d0aab2f AV |
155 | } |
156 | ||
83cabe33 | 157 | if (gpio_is_valid(base)) { |
8d0aab2f | 158 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
159 | return base; |
160 | } else { | |
161 | pr_err("%s: cannot find free range\n", __func__); | |
162 | return -ENOSPC; | |
169b6a7a | 163 | } |
169b6a7a AV |
164 | } |
165 | ||
79a9becd AC |
166 | /** |
167 | * gpiod_get_direction - return the current direction of a GPIO | |
168 | * @desc: GPIO to get the direction of | |
169 | * | |
170 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
171 | * | |
172 | * This function may sleep if gpiod_cansleep() is true. | |
173 | */ | |
8e53b0f1 | 174 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
175 | { |
176 | struct gpio_chip *chip; | |
372e722e | 177 | unsigned offset; |
80b0a602 MN |
178 | int status = -EINVAL; |
179 | ||
372e722e AC |
180 | chip = gpiod_to_chip(desc); |
181 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
182 | |
183 | if (!chip->get_direction) | |
184 | return status; | |
185 | ||
372e722e | 186 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
187 | if (status > 0) { |
188 | /* GPIOF_DIR_IN, or other positive */ | |
189 | status = 1; | |
8e53b0f1 | 190 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
191 | } |
192 | if (status == 0) { | |
193 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 194 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
195 | } |
196 | return status; | |
197 | } | |
79a9becd | 198 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 199 | |
1a989d0f AC |
200 | /* |
201 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 202 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
203 | * |
204 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
205 | * space. | |
206 | */ | |
ff2b1359 | 207 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 208 | { |
ff2b1359 LW |
209 | struct gpio_device *iterator; |
210 | struct gpio_device *previous = NULL; | |
211 | ||
212 | if (!gdev->chip) | |
213 | return -EINVAL; | |
1a989d0f | 214 | |
ff2b1359 LW |
215 | if (list_empty(&gpio_devices)) { |
216 | list_add_tail(&gdev->list, &gpio_devices); | |
e28ecca6 | 217 | return 0; |
1a989d0f AC |
218 | } |
219 | ||
ff2b1359 | 220 | list_for_each_entry(iterator, &gpio_devices, list) { |
fdeb8e15 | 221 | if (iterator->base >= gdev->base + gdev->ngpio) { |
ef7c7553 BJZ |
222 | /* |
223 | * Iterator is the first GPIO chip so there is no | |
224 | * previous one | |
225 | */ | |
e28ecca6 | 226 | if (!previous) { |
ef7c7553 BJZ |
227 | goto found; |
228 | } else { | |
229 | /* | |
230 | * We found a valid range(means | |
231 | * [base, base + ngpio - 1]) between previous | |
232 | * and iterator chip. | |
233 | */ | |
fdeb8e15 LW |
234 | if (previous->base + previous->ngpio |
235 | <= gdev->base) | |
ef7c7553 BJZ |
236 | goto found; |
237 | } | |
1a989d0f | 238 | } |
ef7c7553 | 239 | previous = iterator; |
1a989d0f AC |
240 | } |
241 | ||
e28ecca6 SM |
242 | /* |
243 | * We are beyond the last chip in the list and iterator now | |
244 | * points to the head. | |
245 | * Let iterator point to the last chip in the list. | |
246 | */ | |
247 | ||
ff2b1359 | 248 | iterator = list_last_entry(&gpio_devices, struct gpio_device, list); |
fdeb8e15 | 249 | if (iterator->base + iterator->ngpio <= gdev->base) { |
ff2b1359 | 250 | list_add(&gdev->list, &iterator->list); |
96098df1 | 251 | return 0; |
1a989d0f AC |
252 | } |
253 | ||
ff2b1359 | 254 | dev_err(&gdev->dev, |
ef7c7553 BJZ |
255 | "GPIO integer space overlap, cannot add chip\n"); |
256 | return -EBUSY; | |
1a989d0f | 257 | |
ef7c7553 | 258 | found: |
ff2b1359 | 259 | list_add_tail(&gdev->list, &iterator->list); |
ef7c7553 | 260 | return 0; |
1a989d0f AC |
261 | } |
262 | ||
f881bab0 LW |
263 | /** |
264 | * Convert a GPIO name to its descriptor | |
265 | */ | |
266 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
267 | { | |
ff2b1359 | 268 | struct gpio_device *gdev; |
f881bab0 LW |
269 | unsigned long flags; |
270 | ||
271 | spin_lock_irqsave(&gpio_lock, flags); | |
272 | ||
ff2b1359 | 273 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
274 | int i; |
275 | ||
fdeb8e15 LW |
276 | for (i = 0; i != gdev->ngpio; ++i) { |
277 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 278 | |
fdeb8e15 | 279 | if (!desc->name || !name) |
f881bab0 LW |
280 | continue; |
281 | ||
fdeb8e15 | 282 | if (!strcmp(desc->name, name)) { |
f881bab0 | 283 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 284 | return desc; |
f881bab0 LW |
285 | } |
286 | } | |
287 | } | |
288 | ||
289 | spin_unlock_irqrestore(&gpio_lock, flags); | |
290 | ||
291 | return NULL; | |
292 | } | |
293 | ||
5f3ca732 MP |
294 | /* |
295 | * Takes the names from gc->names and checks if they are all unique. If they | |
296 | * are, they are assigned to their gpio descriptors. | |
297 | * | |
ed37915c | 298 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
299 | */ |
300 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
301 | { | |
fdeb8e15 | 302 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
303 | int i; |
304 | ||
305 | if (!gc->names) | |
306 | return 0; | |
307 | ||
308 | /* First check all names if they are unique */ | |
309 | for (i = 0; i != gc->ngpio; ++i) { | |
310 | struct gpio_desc *gpio; | |
311 | ||
312 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 313 | if (gpio) |
fdeb8e15 | 314 | dev_warn(&gdev->dev, |
34ffd85d | 315 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 316 | gc->names[i]); |
5f3ca732 MP |
317 | } |
318 | ||
319 | /* Then add all names to the GPIO descriptors */ | |
320 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 321 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
322 | |
323 | return 0; | |
324 | } | |
325 | ||
3c702e99 LW |
326 | /** |
327 | * gpio_ioctl() - ioctl handler for the GPIO chardev | |
328 | */ | |
329 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
330 | { | |
331 | struct gpio_device *gdev = filp->private_data; | |
332 | struct gpio_chip *chip = gdev->chip; | |
333 | int __user *ip = (int __user *)arg; | |
334 | struct gpiochip_info chipinfo; | |
335 | ||
336 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
337 | if (!chip) | |
338 | return -ENODEV; | |
339 | ||
340 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { | |
341 | /* Fill in the struct and pass to userspace */ | |
342 | strncpy(chipinfo.name, dev_name(&gdev->dev), | |
343 | sizeof(chipinfo.name)); | |
344 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
345 | strncpy(chipinfo.label, gdev->label, |
346 | sizeof(chipinfo.label)); | |
347 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 348 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
349 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
350 | return -EFAULT; | |
351 | return 0; | |
352 | } | |
353 | return -EINVAL; | |
354 | } | |
355 | ||
356 | /** | |
357 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
358 | * @inode: inode for this chardev | |
359 | * @filp: file struct for storing private data | |
360 | * Returns 0 on success | |
361 | */ | |
362 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
363 | { | |
364 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
365 | struct gpio_device, chrdev); | |
366 | ||
367 | /* Fail on open if the backing gpiochip is gone */ | |
368 | if (!gdev || !gdev->chip) | |
369 | return -ENODEV; | |
370 | get_device(&gdev->dev); | |
371 | filp->private_data = gdev; | |
372 | return 0; | |
373 | } | |
374 | ||
375 | /** | |
376 | * gpio_chrdev_release() - close chardev after ioctl operations | |
377 | * @inode: inode for this chardev | |
378 | * @filp: file struct for storing private data | |
379 | * Returns 0 on success | |
380 | */ | |
381 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
382 | { | |
383 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
384 | struct gpio_device, chrdev); | |
385 | ||
386 | if (!gdev) | |
387 | return -ENODEV; | |
388 | put_device(&gdev->dev); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | ||
393 | static const struct file_operations gpio_fileops = { | |
394 | .release = gpio_chrdev_release, | |
395 | .open = gpio_chrdev_open, | |
396 | .owner = THIS_MODULE, | |
397 | .llseek = noop_llseek, | |
398 | .unlocked_ioctl = gpio_ioctl, | |
399 | .compat_ioctl = gpio_ioctl, | |
400 | }; | |
401 | ||
ff2b1359 LW |
402 | static void gpiodevice_release(struct device *dev) |
403 | { | |
404 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
405 | ||
3c702e99 | 406 | cdev_del(&gdev->chrdev); |
ff2b1359 LW |
407 | list_del(&gdev->list); |
408 | ida_simple_remove(&gpio_ida, gdev->id); | |
9efd9e69 | 409 | kfree(gdev); |
ff2b1359 LW |
410 | } |
411 | ||
d2876d08 | 412 | /** |
b08ea35a | 413 | * gpiochip_add_data() - register a gpio_chip |
d2876d08 | 414 | * @chip: the chip to register, with chip->base initialized |
14e85c0e | 415 | * Context: potentially before irqs will work |
d2876d08 DB |
416 | * |
417 | * Returns a negative errno if the chip can't be registered, such as | |
418 | * because the chip->base is invalid or already associated with a | |
419 | * different chip. Otherwise it returns zero as a success code. | |
8d0aab2f | 420 | * |
b08ea35a | 421 | * When gpiochip_add_data() is called very early during boot, so that GPIOs |
c88402c2 | 422 | * can be freely used, the chip->parent device must be registered before |
d8f388d8 DB |
423 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization |
424 | * for GPIOs will fail rudely. | |
425 | * | |
8d0aab2f AV |
426 | * If chip->base is negative, this requests dynamic assignment of |
427 | * a range of valid GPIOs. | |
d2876d08 | 428 | */ |
b08ea35a | 429 | int gpiochip_add_data(struct gpio_chip *chip, void *data) |
d2876d08 DB |
430 | { |
431 | unsigned long flags; | |
432 | int status = 0; | |
ff2b1359 | 433 | unsigned i; |
8d0aab2f | 434 | int base = chip->base; |
ff2b1359 | 435 | struct gpio_device *gdev; |
d2876d08 | 436 | |
ff2b1359 LW |
437 | /* |
438 | * First: allocate and populate the internal stat container, and | |
439 | * set up the struct device. | |
440 | */ | |
969f07b4 | 441 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 442 | if (!gdev) |
14e85c0e | 443 | return -ENOMEM; |
3c702e99 | 444 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
445 | gdev->chip = chip; |
446 | chip->gpiodev = gdev; | |
447 | if (chip->parent) { | |
448 | gdev->dev.parent = chip->parent; | |
449 | gdev->dev.of_node = chip->parent->of_node; | |
450 | } else { | |
451 | #ifdef CONFIG_OF_GPIO | |
452 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
453 | if (chip->of_node) | |
454 | gdev->dev.of_node = chip->of_node; | |
455 | #endif | |
456 | } | |
457 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); | |
458 | if (gdev->id < 0) { | |
459 | status = gdev->id; | |
460 | goto err_free_gdev; | |
461 | } | |
462 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
463 | device_initialize(&gdev->dev); | |
464 | dev_set_drvdata(&gdev->dev, gdev); | |
465 | if (chip->parent && chip->parent->driver) | |
466 | gdev->owner = chip->parent->driver->owner; | |
467 | else if (chip->owner) | |
468 | /* TODO: remove chip->owner */ | |
469 | gdev->owner = chip->owner; | |
470 | else | |
471 | gdev->owner = THIS_MODULE; | |
d2876d08 | 472 | |
1c3cdb18 LW |
473 | gdev->descs = devm_kcalloc(&gdev->dev, chip->ngpio, |
474 | sizeof(gdev->descs[0]), GFP_KERNEL); | |
475 | if (!gdev->descs) { | |
ff2b1359 LW |
476 | status = -ENOMEM; |
477 | goto err_free_gdev; | |
478 | } | |
479 | ||
5ed41cc4 BJZ |
480 | if (chip->ngpio == 0) { |
481 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 482 | status = -EINVAL; |
1c3cdb18 | 483 | goto err_free_gdev; |
5ed41cc4 | 484 | } |
df4878e9 LW |
485 | |
486 | if (chip->label) | |
487 | gdev->label = devm_kstrdup(&gdev->dev, chip->label, GFP_KERNEL); | |
488 | else | |
489 | gdev->label = devm_kstrdup(&gdev->dev, "unknown", GFP_KERNEL); | |
490 | if (!gdev->label) { | |
491 | status = -ENOMEM; | |
492 | goto err_free_gdev; | |
493 | } | |
494 | ||
fdeb8e15 | 495 | gdev->ngpio = chip->ngpio; |
43c54eca | 496 | gdev->data = data; |
5ed41cc4 | 497 | |
d2876d08 DB |
498 | spin_lock_irqsave(&gpio_lock, flags); |
499 | ||
fdeb8e15 LW |
500 | /* |
501 | * TODO: this allocates a Linux GPIO number base in the global | |
502 | * GPIO numberspace for this chip. In the long run we want to | |
503 | * get *rid* of this numberspace and use only descriptors, but | |
504 | * it may be a pipe dream. It will not happen before we get rid | |
505 | * of the sysfs interface anyways. | |
506 | */ | |
8d0aab2f AV |
507 | if (base < 0) { |
508 | base = gpiochip_find_base(chip->ngpio); | |
509 | if (base < 0) { | |
510 | status = base; | |
225fce83 | 511 | spin_unlock_irqrestore(&gpio_lock, flags); |
1c3cdb18 | 512 | goto err_free_gdev; |
8d0aab2f | 513 | } |
fdeb8e15 LW |
514 | /* |
515 | * TODO: it should not be necessary to reflect the assigned | |
516 | * base outside of the GPIO subsystem. Go over drivers and | |
517 | * see if anyone makes use of this, else drop this and assign | |
518 | * a poison instead. | |
519 | */ | |
8d0aab2f AV |
520 | chip->base = base; |
521 | } | |
fdeb8e15 | 522 | gdev->base = base; |
8d0aab2f | 523 | |
ff2b1359 | 524 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
525 | if (status) { |
526 | spin_unlock_irqrestore(&gpio_lock, flags); | |
1c3cdb18 | 527 | goto err_free_gdev; |
05aa5203 | 528 | } |
1a989d0f | 529 | |
ff2b1359 | 530 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 531 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 532 | |
fdeb8e15 | 533 | desc->gdev = gdev; |
05aa5203 JH |
534 | |
535 | /* REVISIT: most hardware initializes GPIOs as inputs (often | |
536 | * with pullups enabled) so power usage is minimized. Linux | |
537 | * code should set the gpio direction first thing; but until | |
538 | * it does, and in case chip->get_direction is not set, we may | |
539 | * expose the wrong direction in sysfs. | |
540 | */ | |
541 | desc->flags = !chip->direction_input ? (1 << FLAG_IS_OUT) : 0; | |
d2876d08 | 542 | } |
14e85c0e | 543 | |
3bae4811 ZG |
544 | spin_unlock_irqrestore(&gpio_lock, flags); |
545 | ||
f23f1516 | 546 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 547 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
548 | #endif |
549 | ||
5f3ca732 MP |
550 | status = gpiochip_set_desc_names(chip); |
551 | if (status) | |
552 | goto err_remove_from_list; | |
553 | ||
28355f81 TV |
554 | status = of_gpiochip_add(chip); |
555 | if (status) | |
556 | goto err_remove_chip; | |
557 | ||
664e3e5a | 558 | acpi_gpiochip_add(chip); |
391c970c | 559 | |
3c702e99 LW |
560 | /* |
561 | * By first adding the chardev, and then adding the device, | |
562 | * we get a device node entry in sysfs under | |
563 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
564 | * coldplug of device nodes and other udev business. | |
565 | */ | |
566 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
567 | gdev->chrdev.owner = THIS_MODULE; | |
568 | gdev->chrdev.kobj.parent = &gdev->dev.kobj; | |
569 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); | |
570 | status = cdev_add(&gdev->chrdev, gdev->dev.devt, 1); | |
571 | if (status < 0) | |
572 | chip_warn(chip, "failed to add char device %d:%d\n", | |
573 | MAJOR(gpio_devt), gdev->id); | |
574 | else | |
575 | chip_dbg(chip, "added GPIO chardev (%d:%d)\n", | |
576 | MAJOR(gpio_devt), gdev->id); | |
ff2b1359 | 577 | status = device_add(&gdev->dev); |
225fce83 | 578 | if (status) |
3c702e99 | 579 | goto err_remove_chardev; |
cedb1881 | 580 | |
afbc4f31 | 581 | status = gpiochip_sysfs_register(gdev); |
ff2b1359 LW |
582 | if (status) |
583 | goto err_remove_device; | |
584 | ||
585 | /* From this point, the .release() function cleans up gpio_device */ | |
586 | gdev->dev.release = gpiodevice_release; | |
587 | get_device(&gdev->dev); | |
fdeb8e15 LW |
588 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
589 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
590 | dev_name(&gdev->dev), chip->label ? : "generic"); | |
64842aad | 591 | |
cedb1881 | 592 | return 0; |
3bae4811 | 593 | |
ff2b1359 LW |
594 | err_remove_device: |
595 | device_del(&gdev->dev); | |
3c702e99 LW |
596 | err_remove_chardev: |
597 | cdev_del(&gdev->chrdev); | |
225fce83 JH |
598 | err_remove_chip: |
599 | acpi_gpiochip_remove(chip); | |
6d86750c | 600 | gpiochip_free_hogs(chip); |
225fce83 | 601 | of_gpiochip_remove(chip); |
5f3ca732 | 602 | err_remove_from_list: |
225fce83 | 603 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 604 | list_del(&gdev->list); |
3bae4811 | 605 | spin_unlock_irqrestore(&gpio_lock, flags); |
ff2b1359 LW |
606 | err_free_gdev: |
607 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 608 | /* failures here can mean systems won't boot... */ |
7589e59f | 609 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
fdeb8e15 LW |
610 | gdev->base, gdev->base + gdev->ngpio - 1, |
611 | chip->label ? : "generic"); | |
612 | kfree(gdev); | |
d2876d08 DB |
613 | return status; |
614 | } | |
b08ea35a | 615 | EXPORT_SYMBOL_GPL(gpiochip_add_data); |
d2876d08 | 616 | |
43c54eca LW |
617 | /** |
618 | * gpiochip_get_data() - get per-subdriver data for the chip | |
619 | */ | |
620 | void *gpiochip_get_data(struct gpio_chip *chip) | |
621 | { | |
622 | return chip->gpiodev->data; | |
623 | } | |
624 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
625 | ||
d2876d08 DB |
626 | /** |
627 | * gpiochip_remove() - unregister a gpio_chip | |
628 | * @chip: the chip to unregister | |
629 | * | |
630 | * A gpio_chip with any GPIOs still requested may not be removed. | |
631 | */ | |
e1db1706 | 632 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 633 | { |
ff2b1359 | 634 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 635 | struct gpio_desc *desc; |
d2876d08 | 636 | unsigned long flags; |
1c3cdb18 | 637 | unsigned i; |
fab28b89 | 638 | bool requested = false; |
d2876d08 | 639 | |
ff2b1359 LW |
640 | /* Numb the device, cancelling all outstanding operations */ |
641 | gdev->chip = NULL; | |
01cca93a | 642 | |
ff2b1359 | 643 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 644 | gpiochip_sysfs_unregister(gdev); |
00acc3dc | 645 | gpiochip_irqchip_remove(chip); |
6072b9dc | 646 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 647 | gpiochip_remove_pin_ranges(chip); |
f625d460 | 648 | gpiochip_free_hogs(chip); |
391c970c | 649 | of_gpiochip_remove(chip); |
43c54eca LW |
650 | /* |
651 | * We accept no more calls into the driver from this point, so | |
652 | * NULL the driver data pointer | |
653 | */ | |
654 | gdev->data = NULL; | |
391c970c | 655 | |
6798acaa | 656 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 657 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 658 | desc = &gdev->descs[i]; |
fab28b89 JH |
659 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
660 | requested = true; | |
d2876d08 | 661 | } |
d2876d08 | 662 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 663 | |
fab28b89 | 664 | if (requested) |
fdeb8e15 | 665 | dev_crit(&gdev->dev, |
58383c78 | 666 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 667 | |
ff2b1359 LW |
668 | /* |
669 | * The gpiochip side puts its use of the device to rest here: | |
670 | * if there are no userspace clients, the chardev and device will | |
671 | * be removed, else it will be dangling until the last user is | |
672 | * gone. | |
673 | */ | |
674 | put_device(&gdev->dev); | |
d2876d08 DB |
675 | } |
676 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
677 | ||
594fa265 GL |
678 | /** |
679 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
680 | * @data: data to pass to match function | |
681 | * @callback: Callback function to check gpio_chip | |
682 | * | |
683 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
684 | * determined by a user supplied @match callback. The callback should return | |
685 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
686 | * non-zero, this function will return to the caller and not iterate over any | |
687 | * more gpio_chips. | |
688 | */ | |
07ce8ec7 | 689 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 690 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 691 | void *data)) |
594fa265 | 692 | { |
ff2b1359 | 693 | struct gpio_device *gdev; |
125eef96 | 694 | struct gpio_chip *chip; |
594fa265 | 695 | unsigned long flags; |
594fa265 GL |
696 | |
697 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 LW |
698 | list_for_each_entry(gdev, &gpio_devices, list) |
699 | if (match(gdev->chip, data)) | |
594fa265 | 700 | break; |
125eef96 AC |
701 | |
702 | /* No match? */ | |
ff2b1359 | 703 | if (&gdev->list == &gpio_devices) |
125eef96 | 704 | chip = NULL; |
ff2b1359 LW |
705 | else |
706 | chip = gdev->chip; | |
707 | ||
594fa265 GL |
708 | spin_unlock_irqrestore(&gpio_lock, flags); |
709 | ||
710 | return chip; | |
711 | } | |
8fa0c9bf | 712 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 713 | |
79697ef9 AC |
714 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
715 | { | |
716 | const char *name = data; | |
717 | ||
718 | return !strcmp(chip->label, name); | |
719 | } | |
720 | ||
721 | static struct gpio_chip *find_chip_by_name(const char *name) | |
722 | { | |
723 | return gpiochip_find((void *)name, gpiochip_match_name); | |
724 | } | |
725 | ||
14250520 LW |
726 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
727 | ||
728 | /* | |
729 | * The following is irqchip helper code for gpiochips. | |
730 | */ | |
731 | ||
732 | /** | |
3f97d5fc LW |
733 | * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip |
734 | * @gpiochip: the gpiochip to set the irqchip chain to | |
735 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
736 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
737 | * chained irqchip | |
738 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
739 | * coming out of the gpiochip. If the interrupt is nested rather than |
740 | * cascaded, pass NULL in this handler argument | |
14250520 LW |
741 | */ |
742 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
743 | struct irq_chip *irqchip, | |
744 | int parent_irq, | |
745 | irq_flow_handler_t parent_handler) | |
746 | { | |
83141a77 LW |
747 | unsigned int offset; |
748 | ||
83141a77 LW |
749 | if (!gpiochip->irqdomain) { |
750 | chip_err(gpiochip, "called %s before setting up irqchip\n", | |
751 | __func__); | |
1c8732bb LW |
752 | return; |
753 | } | |
754 | ||
3f97d5fc LW |
755 | if (parent_handler) { |
756 | if (gpiochip->can_sleep) { | |
757 | chip_err(gpiochip, | |
758 | "you cannot have chained interrupts on a " | |
759 | "chip that may sleep\n"); | |
760 | return; | |
761 | } | |
3f97d5fc LW |
762 | /* |
763 | * The parent irqchip is already using the chip_data for this | |
764 | * irqchip, so our callbacks simply use the handler_data. | |
765 | */ | |
f7f87753 TG |
766 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
767 | gpiochip); | |
25e4fe92 DES |
768 | |
769 | gpiochip->irq_parent = parent_irq; | |
3f97d5fc | 770 | } |
83141a77 LW |
771 | |
772 | /* Set the parent IRQ for all affected IRQs */ | |
773 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
774 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), | |
775 | parent_irq); | |
14250520 LW |
776 | } |
777 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); | |
778 | ||
779 | /** | |
780 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
781 | * @d: the irqdomain used by this irqchip | |
782 | * @irq: the global irq number used by this GPIO irqchip irq | |
783 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
784 | * | |
785 | * This function will set up the mapping for a certain IRQ line on a | |
786 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
787 | * stored inside the gpiochip. | |
788 | */ | |
789 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, | |
790 | irq_hw_number_t hwirq) | |
791 | { | |
792 | struct gpio_chip *chip = d->host_data; | |
793 | ||
14250520 | 794 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
795 | /* |
796 | * This lock class tells lockdep that GPIO irqs are in a different | |
797 | * category than their parents, so it won't report false recursion. | |
798 | */ | |
799 | irq_set_lockdep_class(irq, chip->lock_key); | |
7633fb95 | 800 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
1c8732bb | 801 | /* Chips that can sleep need nested thread handlers */ |
295494af | 802 | if (chip->can_sleep && !chip->irq_not_threaded) |
1c8732bb | 803 | irq_set_nested_thread(irq, 1); |
14250520 | 804 | irq_set_noprobe(irq); |
23393d49 | 805 | |
1333b90f LW |
806 | /* |
807 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
808 | * is passed as default type. | |
809 | */ | |
810 | if (chip->irq_default_type != IRQ_TYPE_NONE) | |
811 | irq_set_irq_type(irq, chip->irq_default_type); | |
14250520 LW |
812 | |
813 | return 0; | |
814 | } | |
815 | ||
c3626fde LW |
816 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
817 | { | |
1c8732bb LW |
818 | struct gpio_chip *chip = d->host_data; |
819 | ||
1c8732bb LW |
820 | if (chip->can_sleep) |
821 | irq_set_nested_thread(irq, 0); | |
c3626fde LW |
822 | irq_set_chip_and_handler(irq, NULL, NULL); |
823 | irq_set_chip_data(irq, NULL); | |
824 | } | |
825 | ||
14250520 LW |
826 | static const struct irq_domain_ops gpiochip_domain_ops = { |
827 | .map = gpiochip_irq_map, | |
c3626fde | 828 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
829 | /* Virtually all GPIO irqchips are twocell:ed */ |
830 | .xlate = irq_domain_xlate_twocell, | |
831 | }; | |
832 | ||
833 | static int gpiochip_irq_reqres(struct irq_data *d) | |
834 | { | |
835 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
836 | ||
ff2b1359 | 837 | if (!try_module_get(chip->gpiodev->owner)) |
5b76e79c GS |
838 | return -ENODEV; |
839 | ||
e3a2e878 | 840 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
841 | chip_err(chip, |
842 | "unable to lock HW IRQ %lu for IRQ\n", | |
843 | d->hwirq); | |
ff2b1359 | 844 | module_put(chip->gpiodev->owner); |
14250520 LW |
845 | return -EINVAL; |
846 | } | |
847 | return 0; | |
848 | } | |
849 | ||
850 | static void gpiochip_irq_relres(struct irq_data *d) | |
851 | { | |
852 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
853 | ||
e3a2e878 | 854 | gpiochip_unlock_as_irq(chip, d->hwirq); |
ff2b1359 | 855 | module_put(chip->gpiodev->owner); |
14250520 LW |
856 | } |
857 | ||
858 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
859 | { | |
860 | return irq_find_mapping(chip->irqdomain, offset); | |
861 | } | |
862 | ||
863 | /** | |
864 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
865 | * @gpiochip: the gpiochip to remove the irqchip from | |
866 | * | |
867 | * This is called only from gpiochip_remove() | |
868 | */ | |
869 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
870 | { | |
c3626fde LW |
871 | unsigned int offset; |
872 | ||
afa82fab MW |
873 | acpi_gpiochip_free_interrupts(gpiochip); |
874 | ||
25e4fe92 DES |
875 | if (gpiochip->irq_parent) { |
876 | irq_set_chained_handler(gpiochip->irq_parent, NULL); | |
877 | irq_set_handler_data(gpiochip->irq_parent, NULL); | |
878 | } | |
879 | ||
c3626fde LW |
880 | /* Remove all IRQ mappings and delete the domain */ |
881 | if (gpiochip->irqdomain) { | |
882 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
e3893386 GS |
883 | irq_dispose_mapping( |
884 | irq_find_mapping(gpiochip->irqdomain, offset)); | |
14250520 | 885 | irq_domain_remove(gpiochip->irqdomain); |
c3626fde | 886 | } |
14250520 LW |
887 | |
888 | if (gpiochip->irqchip) { | |
889 | gpiochip->irqchip->irq_request_resources = NULL; | |
890 | gpiochip->irqchip->irq_release_resources = NULL; | |
891 | gpiochip->irqchip = NULL; | |
892 | } | |
893 | } | |
894 | ||
895 | /** | |
896 | * gpiochip_irqchip_add() - adds an irqchip to a gpiochip | |
897 | * @gpiochip: the gpiochip to add the irqchip to | |
898 | * @irqchip: the irqchip to add to the gpiochip | |
899 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
900 | * allocate gpiochip irqs from | |
901 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
902 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
903 | * to have the core avoid setting up any default type in the hardware. | |
a0a8bcf4 | 904 | * @lock_key: lockdep class |
14250520 LW |
905 | * |
906 | * This function closely associates a certain irqchip with a certain | |
907 | * gpiochip, providing an irq domain to translate the local IRQs to | |
908 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
909 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 910 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
911 | * from the gpiochip passed as chip data. An irqdomain will be stored |
912 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
913 | * translation. The gpiochip will need to be initialized and registered | |
914 | * before calling this function. | |
915 | * | |
c3626fde LW |
916 | * This function will handle two cell:ed simple IRQs and assumes all |
917 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
918 | * need to be open coded. |
919 | */ | |
a0a8bcf4 GS |
920 | int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, |
921 | struct irq_chip *irqchip, | |
922 | unsigned int first_irq, | |
923 | irq_flow_handler_t handler, | |
924 | unsigned int type, | |
925 | struct lock_class_key *lock_key) | |
14250520 LW |
926 | { |
927 | struct device_node *of_node; | |
928 | unsigned int offset; | |
c3626fde | 929 | unsigned irq_base = 0; |
14250520 LW |
930 | |
931 | if (!gpiochip || !irqchip) | |
932 | return -EINVAL; | |
933 | ||
58383c78 | 934 | if (!gpiochip->parent) { |
14250520 LW |
935 | pr_err("missing gpiochip .dev parent pointer\n"); |
936 | return -EINVAL; | |
937 | } | |
58383c78 | 938 | of_node = gpiochip->parent->of_node; |
14250520 LW |
939 | #ifdef CONFIG_OF_GPIO |
940 | /* | |
20a8a968 | 941 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
942 | * FIXME: get rid of this and use gpiochip->parent->of_node |
943 | * everywhere | |
14250520 LW |
944 | */ |
945 | if (gpiochip->of_node) | |
946 | of_node = gpiochip->of_node; | |
947 | #endif | |
948 | gpiochip->irqchip = irqchip; | |
949 | gpiochip->irq_handler = handler; | |
950 | gpiochip->irq_default_type = type; | |
951 | gpiochip->to_irq = gpiochip_to_irq; | |
a0a8bcf4 | 952 | gpiochip->lock_key = lock_key; |
14250520 LW |
953 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
954 | gpiochip->ngpio, first_irq, | |
955 | &gpiochip_domain_ops, gpiochip); | |
956 | if (!gpiochip->irqdomain) { | |
957 | gpiochip->irqchip = NULL; | |
958 | return -EINVAL; | |
959 | } | |
8b67a1f0 RV |
960 | |
961 | /* | |
962 | * It is possible for a driver to override this, but only if the | |
963 | * alternative functions are both implemented. | |
964 | */ | |
965 | if (!irqchip->irq_request_resources && | |
966 | !irqchip->irq_release_resources) { | |
967 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
968 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
969 | } | |
14250520 LW |
970 | |
971 | /* | |
972 | * Prepare the mapping since the irqchip shall be orthogonal to | |
973 | * any gpiochip calls. If the first_irq was zero, this is | |
974 | * necessary to allocate descriptors for all IRQs. | |
975 | */ | |
c3626fde LW |
976 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
977 | irq_base = irq_create_mapping(gpiochip->irqdomain, offset); | |
978 | if (offset == 0) | |
979 | /* | |
980 | * Store the base into the gpiochip to be used when | |
981 | * unmapping the irqs. | |
982 | */ | |
983 | gpiochip->irq_base = irq_base; | |
984 | } | |
14250520 | 985 | |
afa82fab MW |
986 | acpi_gpiochip_request_interrupts(gpiochip); |
987 | ||
14250520 LW |
988 | return 0; |
989 | } | |
a0a8bcf4 | 990 | EXPORT_SYMBOL_GPL(_gpiochip_irqchip_add); |
14250520 LW |
991 | |
992 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
993 | ||
994 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} | |
995 | ||
996 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
997 | ||
c771c2f4 JG |
998 | /** |
999 | * gpiochip_generic_request() - request the gpio function for a pin | |
1000 | * @chip: the gpiochip owning the GPIO | |
1001 | * @offset: the offset of the GPIO to request for GPIO function | |
1002 | */ | |
1003 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
1004 | { | |
fdeb8e15 | 1005 | return pinctrl_request_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1006 | } |
1007 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
1008 | ||
1009 | /** | |
1010 | * gpiochip_generic_free() - free the gpio function from a pin | |
1011 | * @chip: the gpiochip to request the gpio function for | |
1012 | * @offset: the offset of the GPIO to free from GPIO function | |
1013 | */ | |
1014 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
1015 | { | |
fdeb8e15 | 1016 | pinctrl_free_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1017 | } |
1018 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
1019 | ||
f23f1516 | 1020 | #ifdef CONFIG_PINCTRL |
165adc9c | 1021 | |
586a87e6 CR |
1022 | /** |
1023 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
1024 | * @chip: the gpiochip to add the range for | |
d32651f6 | 1025 | * @pctldev: the pin controller to map to |
586a87e6 CR |
1026 | * @gpio_offset: the start offset in the current gpio_chip number space |
1027 | * @pin_group: name of the pin group inside the pin controller | |
1028 | */ | |
1029 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
1030 | struct pinctrl_dev *pctldev, | |
1031 | unsigned int gpio_offset, const char *pin_group) | |
1032 | { | |
1033 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1034 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
1035 | int ret; |
1036 | ||
1037 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
1038 | if (!pin_range) { | |
1a2a99c6 | 1039 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
1040 | return -ENOMEM; |
1041 | } | |
1042 | ||
1043 | /* Use local offset as range ID */ | |
1044 | pin_range->range.id = gpio_offset; | |
1045 | pin_range->range.gc = chip; | |
1046 | pin_range->range.name = chip->label; | |
fdeb8e15 | 1047 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
1048 | pin_range->pctldev = pctldev; |
1049 | ||
1050 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
1051 | &pin_range->range.pins, | |
1052 | &pin_range->range.npins); | |
61c6375d MN |
1053 | if (ret < 0) { |
1054 | kfree(pin_range); | |
586a87e6 | 1055 | return ret; |
61c6375d | 1056 | } |
586a87e6 CR |
1057 | |
1058 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
1059 | ||
1a2a99c6 AS |
1060 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
1061 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
1062 | pinctrl_dev_get_devname(pctldev), pin_group); |
1063 | ||
20ec3e39 | 1064 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
1065 | |
1066 | return 0; | |
1067 | } | |
1068 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
1069 | ||
3f0f8670 LW |
1070 | /** |
1071 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
1072 | * @chip: the gpiochip to add the range for | |
1073 | * @pinctrl_name: the dev_name() of the pin controller to map to | |
316511c0 LW |
1074 | * @gpio_offset: the start offset in the current gpio_chip number space |
1075 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
1076 | * @npins: the number of pins from the offset of each pin space (GPIO and |
1077 | * pin controller) to accumulate in this range | |
1078 | */ | |
1e63d7b9 | 1079 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 1080 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 1081 | unsigned int npins) |
f23f1516 SH |
1082 | { |
1083 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1084 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 1085 | int ret; |
f23f1516 | 1086 | |
3f0f8670 | 1087 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 1088 | if (!pin_range) { |
1a2a99c6 | 1089 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 1090 | return -ENOMEM; |
f23f1516 SH |
1091 | } |
1092 | ||
3f0f8670 | 1093 | /* Use local offset as range ID */ |
316511c0 | 1094 | pin_range->range.id = gpio_offset; |
3f0f8670 | 1095 | pin_range->range.gc = chip; |
f23f1516 | 1096 | pin_range->range.name = chip->label; |
fdeb8e15 | 1097 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 1098 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 1099 | pin_range->range.npins = npins; |
192c369c | 1100 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 1101 | &pin_range->range); |
8f23ca1a | 1102 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 1103 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 1104 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 1105 | kfree(pin_range); |
b4d4b1f0 | 1106 | return ret; |
3f0f8670 | 1107 | } |
1a2a99c6 AS |
1108 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
1109 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
1110 | pinctl_name, |
1111 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 1112 | |
20ec3e39 | 1113 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
1114 | |
1115 | return 0; | |
f23f1516 | 1116 | } |
165adc9c | 1117 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 1118 | |
3f0f8670 LW |
1119 | /** |
1120 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
1121 | * @chip: the chip to remove all the mappings for | |
1122 | */ | |
f23f1516 SH |
1123 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
1124 | { | |
1125 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 1126 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 1127 | |
20ec3e39 | 1128 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
1129 | list_del(&pin_range->node); |
1130 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
1131 | &pin_range->range); | |
3f0f8670 | 1132 | kfree(pin_range); |
f23f1516 SH |
1133 | } |
1134 | } | |
165adc9c LW |
1135 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
1136 | ||
1137 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 1138 | |
d2876d08 DB |
1139 | /* These "optional" allocation calls help prevent drivers from stomping |
1140 | * on each other, and help provide better diagnostics in debugfs. | |
1141 | * They're called even less than the "set direction" calls. | |
1142 | */ | |
77c2d792 | 1143 | static int __gpiod_request(struct gpio_desc *desc, const char *label) |
d2876d08 | 1144 | { |
fdeb8e15 | 1145 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 1146 | int status; |
d2876d08 DB |
1147 | unsigned long flags; |
1148 | ||
bcabdef1 AC |
1149 | spin_lock_irqsave(&gpio_lock, flags); |
1150 | ||
d2876d08 | 1151 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 1152 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
1153 | */ |
1154 | ||
1155 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
1156 | desc_set_label(desc, label ? : "?"); | |
1157 | status = 0; | |
438d8908 | 1158 | } else { |
d2876d08 | 1159 | status = -EBUSY; |
7460db56 | 1160 | goto done; |
35e8bb51 DB |
1161 | } |
1162 | ||
1163 | if (chip->request) { | |
1164 | /* chip->request may sleep */ | |
1165 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1166 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1167 | spin_lock_irqsave(&gpio_lock, flags); |
1168 | ||
1169 | if (status < 0) { | |
1170 | desc_set_label(desc, NULL); | |
35e8bb51 | 1171 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 1172 | goto done; |
35e8bb51 | 1173 | } |
438d8908 | 1174 | } |
80b0a602 MN |
1175 | if (chip->get_direction) { |
1176 | /* chip->get_direction may sleep */ | |
1177 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 1178 | gpiod_get_direction(desc); |
80b0a602 MN |
1179 | spin_lock_irqsave(&gpio_lock, flags); |
1180 | } | |
77c2d792 | 1181 | done: |
923b93e4 LP |
1182 | if (status < 0) { |
1183 | /* Clear flags that might have been set by the caller before | |
1184 | * requesting the GPIO. | |
1185 | */ | |
1186 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
1187 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
1188 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
1189 | } | |
77c2d792 MW |
1190 | spin_unlock_irqrestore(&gpio_lock, flags); |
1191 | return status; | |
1192 | } | |
1193 | ||
fdeb8e15 LW |
1194 | /* |
1195 | * This descriptor validation needs to be inserted verbatim into each | |
1196 | * function taking a descriptor, so we need to use a preprocessor | |
1197 | * macro to avoid endless duplication. | |
1198 | */ | |
1199 | #define VALIDATE_DESC(desc) do { \ | |
1200 | if (!desc || !desc->gdev) { \ | |
1201 | pr_warn("%s: invalid GPIO\n", __func__); \ | |
1202 | return -EINVAL; \ | |
1203 | } \ | |
1204 | if ( !desc->gdev->chip ) { \ | |
1205 | dev_warn(&desc->gdev->dev, \ | |
1206 | "%s: backing chip is gone\n", __func__); \ | |
1207 | return 0; \ | |
1208 | } } while (0) | |
1209 | ||
1210 | #define VALIDATE_DESC_VOID(desc) do { \ | |
1211 | if (!desc || !desc->gdev) { \ | |
1212 | pr_warn("%s: invalid GPIO\n", __func__); \ | |
1213 | return; \ | |
1214 | } \ | |
1215 | if (!desc->gdev->chip) { \ | |
1216 | dev_warn(&desc->gdev->dev, \ | |
1217 | "%s: backing chip is gone\n", __func__); \ | |
1218 | return; \ | |
1219 | } } while (0) | |
1220 | ||
1221 | ||
0eb4c6c2 | 1222 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
1223 | { |
1224 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 1225 | struct gpio_device *gdev; |
77c2d792 | 1226 | |
fdeb8e15 LW |
1227 | VALIDATE_DESC(desc); |
1228 | gdev = desc->gdev; | |
77c2d792 | 1229 | |
fdeb8e15 | 1230 | if (try_module_get(gdev->owner)) { |
77c2d792 MW |
1231 | status = __gpiod_request(desc, label); |
1232 | if (status < 0) | |
fdeb8e15 | 1233 | module_put(gdev->owner); |
33a68e86 LW |
1234 | else |
1235 | get_device(&gdev->dev); | |
77c2d792 MW |
1236 | } |
1237 | ||
d2876d08 | 1238 | if (status) |
7589e59f | 1239 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 1240 | |
d2876d08 DB |
1241 | return status; |
1242 | } | |
372e722e | 1243 | |
77c2d792 | 1244 | static bool __gpiod_free(struct gpio_desc *desc) |
d2876d08 | 1245 | { |
77c2d792 | 1246 | bool ret = false; |
d2876d08 | 1247 | unsigned long flags; |
35e8bb51 | 1248 | struct gpio_chip *chip; |
d2876d08 | 1249 | |
3d599d1c UKK |
1250 | might_sleep(); |
1251 | ||
372e722e | 1252 | gpiod_unexport(desc); |
d8f388d8 | 1253 | |
d2876d08 DB |
1254 | spin_lock_irqsave(&gpio_lock, flags); |
1255 | ||
fdeb8e15 | 1256 | chip = desc->gdev->chip; |
35e8bb51 DB |
1257 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
1258 | if (chip->free) { | |
1259 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 1260 | might_sleep_if(chip->can_sleep); |
372e722e | 1261 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
1262 | spin_lock_irqsave(&gpio_lock, flags); |
1263 | } | |
d2876d08 | 1264 | desc_set_label(desc, NULL); |
07697461 | 1265 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 1266 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 1267 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 1268 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 1269 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
1270 | ret = true; |
1271 | } | |
d2876d08 DB |
1272 | |
1273 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
1274 | return ret; |
1275 | } | |
1276 | ||
0eb4c6c2 | 1277 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 1278 | { |
33a68e86 | 1279 | if (desc && desc->gdev && __gpiod_free(desc)) { |
fdeb8e15 | 1280 | module_put(desc->gdev->owner); |
33a68e86 LW |
1281 | put_device(&desc->gdev->dev); |
1282 | } else { | |
77c2d792 | 1283 | WARN_ON(extra_checks); |
33a68e86 | 1284 | } |
d2876d08 | 1285 | } |
372e722e | 1286 | |
d2876d08 DB |
1287 | /** |
1288 | * gpiochip_is_requested - return string iff signal was requested | |
1289 | * @chip: controller managing the signal | |
1290 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
1291 | * | |
1292 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
1293 | * The string returned is the label passed to gpio_request(); if none has been |
1294 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
1295 | * |
1296 | * This function is for use by GPIO controller drivers. The label can | |
1297 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
1298 | * can help avoid accidentally multiplexing it to another controller. | |
1299 | */ | |
1300 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
1301 | { | |
6c0b4e6c | 1302 | struct gpio_desc *desc; |
d2876d08 | 1303 | |
48b5953e | 1304 | if (offset >= chip->ngpio) |
d2876d08 | 1305 | return NULL; |
6c0b4e6c | 1306 | |
1c3cdb18 | 1307 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 1308 | |
372e722e | 1309 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 1310 | return NULL; |
372e722e | 1311 | return desc->label; |
d2876d08 DB |
1312 | } |
1313 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
1314 | ||
77c2d792 MW |
1315 | /** |
1316 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
1317 | * @desc: GPIO descriptor to request | |
1318 | * @label: label for the GPIO | |
1319 | * | |
1320 | * Function allows GPIO chip drivers to request and use their own GPIO | |
1321 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
1322 | * function will not increase reference count of the GPIO chip module. This | |
1323 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
1324 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
1325 | */ | |
abdc08a3 AC |
1326 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
1327 | const char *label) | |
77c2d792 | 1328 | { |
abdc08a3 AC |
1329 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
1330 | int err; | |
77c2d792 | 1331 | |
abdc08a3 AC |
1332 | if (IS_ERR(desc)) { |
1333 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
1334 | return desc; | |
1335 | } | |
1336 | ||
1337 | err = __gpiod_request(desc, label); | |
1338 | if (err < 0) | |
1339 | return ERR_PTR(err); | |
77c2d792 | 1340 | |
abdc08a3 | 1341 | return desc; |
77c2d792 | 1342 | } |
f7d4ad98 | 1343 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
1344 | |
1345 | /** | |
1346 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
1347 | * @desc: GPIO descriptor to free | |
1348 | * | |
1349 | * Function frees the given GPIO requested previously with | |
1350 | * gpiochip_request_own_desc(). | |
1351 | */ | |
1352 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
1353 | { | |
1354 | if (desc) | |
1355 | __gpiod_free(desc); | |
1356 | } | |
f7d4ad98 | 1357 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 1358 | |
fdeb8e15 LW |
1359 | /* |
1360 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
1361 | * some cases this is done in early boot, before IRQs are enabled. |
1362 | * | |
1363 | * As a rule these aren't called more than once (except for drivers | |
1364 | * using the open-drain emulation idiom) so these are natural places | |
1365 | * to accumulate extra debugging checks. Note that we can't (yet) | |
1366 | * rely on gpio_request() having been called beforehand. | |
1367 | */ | |
1368 | ||
79a9becd AC |
1369 | /** |
1370 | * gpiod_direction_input - set the GPIO direction to input | |
1371 | * @desc: GPIO to set to input | |
1372 | * | |
1373 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
1374 | * be called safely on it. | |
1375 | * | |
1376 | * Return 0 in case of success, else an error code. | |
1377 | */ | |
1378 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 1379 | { |
d2876d08 | 1380 | struct gpio_chip *chip; |
d2876d08 DB |
1381 | int status = -EINVAL; |
1382 | ||
fdeb8e15 LW |
1383 | VALIDATE_DESC(desc); |
1384 | chip = desc->gdev->chip; | |
bcabdef1 | 1385 | |
be1a4b13 | 1386 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
1387 | gpiod_warn(desc, |
1388 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 1389 | __func__); |
be1a4b13 LW |
1390 | return -EIO; |
1391 | } | |
1392 | ||
d82da797 | 1393 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
1394 | if (status == 0) |
1395 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 1396 | |
372e722e | 1397 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 1398 | |
d2876d08 DB |
1399 | return status; |
1400 | } | |
79a9becd | 1401 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 1402 | |
ef70bbe1 | 1403 | static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
d2876d08 | 1404 | { |
d2876d08 | 1405 | struct gpio_chip *chip; |
d2876d08 DB |
1406 | int status = -EINVAL; |
1407 | ||
d468bf9e LW |
1408 | /* GPIOs used for IRQs shall not be set as output */ |
1409 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
1410 | gpiod_err(desc, | |
1411 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
1412 | __func__); | |
1413 | return -EIO; | |
1414 | } | |
1415 | ||
aca5ce14 LD |
1416 | /* Open drain pin should not be driven to 1 */ |
1417 | if (value && test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
372e722e | 1418 | return gpiod_direction_input(desc); |
aca5ce14 | 1419 | |
25553ff0 LD |
1420 | /* Open source pin should not be driven to 0 */ |
1421 | if (!value && test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
372e722e | 1422 | return gpiod_direction_input(desc); |
25553ff0 | 1423 | |
fdeb8e15 | 1424 | chip = desc->gdev->chip; |
be1a4b13 | 1425 | if (!chip->set || !chip->direction_output) { |
6424de5a MB |
1426 | gpiod_warn(desc, |
1427 | "%s: missing set() or direction_output() operations\n", | |
1428 | __func__); | |
be1a4b13 LW |
1429 | return -EIO; |
1430 | } | |
1431 | ||
d82da797 | 1432 | status = chip->direction_output(chip, gpio_chip_hwgpio(desc), value); |
d2876d08 DB |
1433 | if (status == 0) |
1434 | set_bit(FLAG_IS_OUT, &desc->flags); | |
372e722e AC |
1435 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1436 | trace_gpio_direction(desc_to_gpio(desc), 0, status); | |
d2876d08 DB |
1437 | return status; |
1438 | } | |
ef70bbe1 PZ |
1439 | |
1440 | /** | |
1441 | * gpiod_direction_output_raw - set the GPIO direction to output | |
1442 | * @desc: GPIO to set to output | |
1443 | * @value: initial output value of the GPIO | |
1444 | * | |
1445 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1446 | * be called safely on it. The initial value of the output must be specified | |
1447 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
1448 | * | |
1449 | * Return 0 in case of success, else an error code. | |
1450 | */ | |
1451 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
1452 | { | |
fdeb8e15 | 1453 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
1454 | return _gpiod_direction_output_raw(desc, value); |
1455 | } | |
1456 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
1457 | ||
1458 | /** | |
90df4fe0 | 1459 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
1460 | * @desc: GPIO to set to output |
1461 | * @value: initial output value of the GPIO | |
1462 | * | |
1463 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1464 | * be called safely on it. The initial value of the output must be specified | |
1465 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1466 | * account. | |
1467 | * | |
1468 | * Return 0 in case of success, else an error code. | |
1469 | */ | |
1470 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
1471 | { | |
fdeb8e15 | 1472 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
1473 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1474 | value = !value; | |
1475 | return _gpiod_direction_output_raw(desc, value); | |
1476 | } | |
79a9becd | 1477 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 1478 | |
c4b5be98 | 1479 | /** |
79a9becd | 1480 | * gpiod_set_debounce - sets @debounce time for a @gpio |
c4b5be98 FB |
1481 | * @gpio: the gpio to set debounce time |
1482 | * @debounce: debounce time is microseconds | |
65d87656 LW |
1483 | * |
1484 | * returns -ENOTSUPP if the controller does not support setting | |
1485 | * debounce. | |
c4b5be98 | 1486 | */ |
79a9becd | 1487 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 1488 | { |
c4b5be98 | 1489 | struct gpio_chip *chip; |
c4b5be98 | 1490 | |
fdeb8e15 LW |
1491 | VALIDATE_DESC(desc); |
1492 | chip = desc->gdev->chip; | |
be1a4b13 | 1493 | if (!chip->set || !chip->set_debounce) { |
6424de5a MB |
1494 | gpiod_dbg(desc, |
1495 | "%s: missing set() or set_debounce() operations\n", | |
1496 | __func__); | |
65d87656 | 1497 | return -ENOTSUPP; |
be1a4b13 LW |
1498 | } |
1499 | ||
d82da797 | 1500 | return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce); |
c4b5be98 | 1501 | } |
79a9becd | 1502 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 1503 | |
79a9becd AC |
1504 | /** |
1505 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
1506 | * @desc: the gpio descriptor to test | |
1507 | * | |
1508 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
1509 | */ | |
1510 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 1511 | { |
fdeb8e15 | 1512 | VALIDATE_DESC(desc); |
79a9becd | 1513 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 1514 | } |
79a9becd | 1515 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
1516 | |
1517 | /* I/O calls are only valid after configuration completed; the relevant | |
1518 | * "is this a valid GPIO" error checks should already have been done. | |
1519 | * | |
1520 | * "Get" operations are often inlinable as reading a pin value register, | |
1521 | * and masking the relevant bit in that register. | |
1522 | * | |
1523 | * When "set" operations are inlinable, they involve writing that mask to | |
1524 | * one register to set a low value, or a different register to set it high. | |
1525 | * Otherwise locking is needed, so there may be little value to inlining. | |
1526 | * | |
1527 | *------------------------------------------------------------------------ | |
1528 | * | |
1529 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
1530 | * have requested the GPIO. That can include implicit requesting by | |
1531 | * a direction setting call. Marking a gpio as requested locks its chip | |
1532 | * in memory, guaranteeing that these table lookups need no more locking | |
1533 | * and that gpiochip_remove() will fail. | |
1534 | * | |
1535 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
1536 | * that the GPIO was actually requested. | |
1537 | */ | |
1538 | ||
e20538b8 | 1539 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 DB |
1540 | { |
1541 | struct gpio_chip *chip; | |
372e722e | 1542 | int offset; |
e20538b8 | 1543 | int value; |
d2876d08 | 1544 | |
fdeb8e15 | 1545 | chip = desc->gdev->chip; |
372e722e | 1546 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 1547 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 1548 | value = value < 0 ? value : !!value; |
372e722e | 1549 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 1550 | return value; |
d2876d08 | 1551 | } |
372e722e | 1552 | |
d2876d08 | 1553 | /** |
79a9becd AC |
1554 | * gpiod_get_raw_value() - return a gpio's raw value |
1555 | * @desc: gpio whose value will be returned | |
d2876d08 | 1556 | * |
79a9becd | 1557 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 1558 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
1559 | * |
1560 | * This function should be called from contexts where we cannot sleep, and will | |
1561 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1562 | */ |
79a9becd | 1563 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 1564 | { |
fdeb8e15 | 1565 | VALIDATE_DESC(desc); |
e4e449e8 | 1566 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 1567 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 1568 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1569 | } |
79a9becd | 1570 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 1571 | |
79a9becd AC |
1572 | /** |
1573 | * gpiod_get_value() - return a gpio's value | |
1574 | * @desc: gpio whose value will be returned | |
1575 | * | |
1576 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 1577 | * account, or negative errno on failure. |
79a9becd AC |
1578 | * |
1579 | * This function should be called from contexts where we cannot sleep, and will | |
1580 | * complain if the GPIO chip functions potentially sleep. | |
1581 | */ | |
1582 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 1583 | { |
79a9becd | 1584 | int value; |
fdeb8e15 LW |
1585 | |
1586 | VALIDATE_DESC(desc); | |
79a9becd | 1587 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 1588 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
1589 | |
1590 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
1591 | if (value < 0) |
1592 | return value; | |
1593 | ||
79a9becd AC |
1594 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1595 | value = !value; | |
1596 | ||
1597 | return value; | |
372e722e | 1598 | } |
79a9becd | 1599 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 1600 | |
aca5ce14 LD |
1601 | /* |
1602 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. | |
79a9becd | 1603 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 1604 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 1605 | */ |
23600969 | 1606 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
1607 | { |
1608 | int err = 0; | |
fdeb8e15 | 1609 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
1610 | int offset = gpio_chip_hwgpio(desc); |
1611 | ||
aca5ce14 | 1612 | if (value) { |
372e722e | 1613 | err = chip->direction_input(chip, offset); |
aca5ce14 | 1614 | if (!err) |
372e722e | 1615 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1616 | } else { |
372e722e | 1617 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 1618 | if (!err) |
372e722e | 1619 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1620 | } |
372e722e | 1621 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 1622 | if (err < 0) |
6424de5a MB |
1623 | gpiod_err(desc, |
1624 | "%s: Error in set_value for open drain err %d\n", | |
1625 | __func__, err); | |
aca5ce14 LD |
1626 | } |
1627 | ||
25553ff0 | 1628 | /* |
79a9becd AC |
1629 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
1630 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 1631 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 1632 | */ |
23600969 | 1633 | static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value) |
25553ff0 LD |
1634 | { |
1635 | int err = 0; | |
fdeb8e15 | 1636 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
1637 | int offset = gpio_chip_hwgpio(desc); |
1638 | ||
25553ff0 | 1639 | if (value) { |
372e722e | 1640 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 1641 | if (!err) |
372e722e | 1642 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1643 | } else { |
372e722e | 1644 | err = chip->direction_input(chip, offset); |
25553ff0 | 1645 | if (!err) |
372e722e | 1646 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1647 | } |
372e722e | 1648 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 1649 | if (err < 0) |
6424de5a MB |
1650 | gpiod_err(desc, |
1651 | "%s: Error in set_value for open source err %d\n", | |
1652 | __func__, err); | |
25553ff0 LD |
1653 | } |
1654 | ||
23600969 | 1655 | static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value) |
d2876d08 DB |
1656 | { |
1657 | struct gpio_chip *chip; | |
1658 | ||
fdeb8e15 | 1659 | chip = desc->gdev->chip; |
372e722e AC |
1660 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1661 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
1662 | _gpio_set_open_drain_value(desc, value); | |
1663 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
1664 | _gpio_set_open_source_value(desc, value); | |
aca5ce14 | 1665 | else |
372e722e AC |
1666 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
1667 | } | |
1668 | ||
5f424243 RI |
1669 | /* |
1670 | * set multiple outputs on the same chip; | |
1671 | * use the chip's set_multiple function if available; | |
1672 | * otherwise set the outputs sequentially; | |
1673 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
1674 | * defines which outputs are to be changed | |
1675 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
1676 | * defines the values the outputs specified by mask are to be set to | |
1677 | */ | |
1678 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
1679 | unsigned long *mask, unsigned long *bits) | |
1680 | { | |
1681 | if (chip->set_multiple) { | |
1682 | chip->set_multiple(chip, mask, bits); | |
1683 | } else { | |
1684 | int i; | |
1685 | for (i = 0; i < chip->ngpio; i++) { | |
1686 | if (mask[BIT_WORD(i)] == 0) { | |
1687 | /* no more set bits in this mask word; | |
1688 | * skip ahead to the next word */ | |
1689 | i = (BIT_WORD(i) + 1) * BITS_PER_LONG - 1; | |
1690 | continue; | |
1691 | } | |
1692 | /* set outputs if the corresponding mask bit is set */ | |
38e003f4 | 1693 | if (__test_and_clear_bit(i, mask)) |
5f424243 | 1694 | chip->set(chip, i, test_bit(i, bits)); |
5f424243 RI |
1695 | } |
1696 | } | |
1697 | } | |
1698 | ||
3fff99bc RI |
1699 | static void gpiod_set_array_value_priv(bool raw, bool can_sleep, |
1700 | unsigned int array_size, | |
1701 | struct gpio_desc **desc_array, | |
1702 | int *value_array) | |
5f424243 RI |
1703 | { |
1704 | int i = 0; | |
1705 | ||
1706 | while (i < array_size) { | |
fdeb8e15 | 1707 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
5f424243 RI |
1708 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; |
1709 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
1710 | int count = 0; | |
1711 | ||
38e003f4 | 1712 | if (!can_sleep) |
5f424243 | 1713 | WARN_ON(chip->can_sleep); |
38e003f4 | 1714 | |
5f424243 RI |
1715 | memset(mask, 0, sizeof(mask)); |
1716 | do { | |
1717 | struct gpio_desc *desc = desc_array[i]; | |
1718 | int hwgpio = gpio_chip_hwgpio(desc); | |
1719 | int value = value_array[i]; | |
1720 | ||
1721 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1722 | value = !value; | |
1723 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
1724 | /* | |
1725 | * collect all normal outputs belonging to the same chip | |
1726 | * open drain and open source outputs are set individually | |
1727 | */ | |
1728 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
38e003f4 | 1729 | _gpio_set_open_drain_value(desc, value); |
5f424243 RI |
1730 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
1731 | _gpio_set_open_source_value(desc, value); | |
1732 | } else { | |
1733 | __set_bit(hwgpio, mask); | |
38e003f4 | 1734 | if (value) |
5f424243 | 1735 | __set_bit(hwgpio, bits); |
38e003f4 | 1736 | else |
5f424243 | 1737 | __clear_bit(hwgpio, bits); |
5f424243 RI |
1738 | count++; |
1739 | } | |
1740 | i++; | |
fdeb8e15 LW |
1741 | } while ((i < array_size) && |
1742 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 1743 | /* push collected bits to outputs */ |
38e003f4 | 1744 | if (count != 0) |
5f424243 | 1745 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
1746 | } |
1747 | } | |
1748 | ||
d2876d08 | 1749 | /** |
79a9becd AC |
1750 | * gpiod_set_raw_value() - assign a gpio's raw value |
1751 | * @desc: gpio whose value will be assigned | |
d2876d08 | 1752 | * @value: value to assign |
d2876d08 | 1753 | * |
79a9becd AC |
1754 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
1755 | * regard for its ACTIVE_LOW status. | |
1756 | * | |
1757 | * This function should be called from contexts where we cannot sleep, and will | |
1758 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1759 | */ |
79a9becd | 1760 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 1761 | { |
fdeb8e15 | 1762 | VALIDATE_DESC_VOID(desc); |
e4e449e8 | 1763 | /* Should be using gpio_set_value_cansleep() */ |
fdeb8e15 | 1764 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 1765 | _gpiod_set_raw_value(desc, value); |
d2876d08 | 1766 | } |
79a9becd | 1767 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
1768 | |
1769 | /** | |
79a9becd AC |
1770 | * gpiod_set_value() - assign a gpio's value |
1771 | * @desc: gpio whose value will be assigned | |
1772 | * @value: value to assign | |
1773 | * | |
1774 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1775 | * account | |
d2876d08 | 1776 | * |
79a9becd AC |
1777 | * This function should be called from contexts where we cannot sleep, and will |
1778 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1779 | */ |
79a9becd | 1780 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 1781 | { |
fdeb8e15 | 1782 | VALIDATE_DESC_VOID(desc); |
79a9becd | 1783 | /* Should be using gpio_set_value_cansleep() */ |
fdeb8e15 | 1784 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
1785 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1786 | value = !value; | |
1787 | _gpiod_set_raw_value(desc, value); | |
372e722e | 1788 | } |
79a9becd | 1789 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 1790 | |
5f424243 | 1791 | /** |
3fff99bc | 1792 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1793 | * @array_size: number of elements in the descriptor / value arrays |
1794 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1795 | * @value_array: array of values to assign | |
1796 | * | |
1797 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
1798 | * without regard for their ACTIVE_LOW status. | |
1799 | * | |
1800 | * This function should be called from contexts where we cannot sleep, and will | |
1801 | * complain if the GPIO chip functions potentially sleep. | |
1802 | */ | |
3fff99bc | 1803 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
1804 | struct gpio_desc **desc_array, int *value_array) |
1805 | { | |
1806 | if (!desc_array) | |
1807 | return; | |
3fff99bc RI |
1808 | gpiod_set_array_value_priv(true, false, array_size, desc_array, |
1809 | value_array); | |
5f424243 | 1810 | } |
3fff99bc | 1811 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
1812 | |
1813 | /** | |
3fff99bc | 1814 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1815 | * @array_size: number of elements in the descriptor / value arrays |
1816 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1817 | * @value_array: array of values to assign | |
1818 | * | |
1819 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
1820 | * into account. | |
1821 | * | |
1822 | * This function should be called from contexts where we cannot sleep, and will | |
1823 | * complain if the GPIO chip functions potentially sleep. | |
1824 | */ | |
3fff99bc RI |
1825 | void gpiod_set_array_value(unsigned int array_size, |
1826 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
1827 | { |
1828 | if (!desc_array) | |
1829 | return; | |
3fff99bc RI |
1830 | gpiod_set_array_value_priv(false, false, array_size, desc_array, |
1831 | value_array); | |
5f424243 | 1832 | } |
3fff99bc | 1833 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 1834 | |
d2876d08 | 1835 | /** |
79a9becd AC |
1836 | * gpiod_cansleep() - report whether gpio value access may sleep |
1837 | * @desc: gpio to check | |
d2876d08 | 1838 | * |
d2876d08 | 1839 | */ |
79a9becd | 1840 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 1841 | { |
fdeb8e15 LW |
1842 | VALIDATE_DESC(desc); |
1843 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 1844 | } |
79a9becd | 1845 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 1846 | |
0f6d504e | 1847 | /** |
79a9becd AC |
1848 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
1849 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 1850 | * |
79a9becd AC |
1851 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
1852 | * error. | |
0f6d504e | 1853 | */ |
79a9becd | 1854 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e DB |
1855 | { |
1856 | struct gpio_chip *chip; | |
372e722e | 1857 | int offset; |
0f6d504e | 1858 | |
fdeb8e15 LW |
1859 | VALIDATE_DESC(desc); |
1860 | chip = desc->gdev->chip; | |
372e722e AC |
1861 | offset = gpio_chip_hwgpio(desc); |
1862 | return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO; | |
0f6d504e | 1863 | } |
79a9becd | 1864 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 1865 | |
d468bf9e | 1866 | /** |
e3a2e878 | 1867 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
1868 | * @chip: the chip the GPIO to lock belongs to |
1869 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
1870 | * |
1871 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 1872 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 1873 | */ |
e3a2e878 | 1874 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 1875 | { |
d74be6df | 1876 | if (offset >= chip->ngpio) |
d468bf9e LW |
1877 | return -EINVAL; |
1878 | ||
1c3cdb18 | 1879 | if (test_bit(FLAG_IS_OUT, &chip->gpiodev->descs[offset].flags)) { |
d74be6df | 1880 | chip_err(chip, |
d468bf9e LW |
1881 | "%s: tried to flag a GPIO set as output for IRQ\n", |
1882 | __func__); | |
1883 | return -EIO; | |
1884 | } | |
1885 | ||
1c3cdb18 | 1886 | set_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
d468bf9e | 1887 | return 0; |
372e722e | 1888 | } |
e3a2e878 | 1889 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 1890 | |
d468bf9e | 1891 | /** |
e3a2e878 | 1892 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
1893 | * @chip: the chip the GPIO to lock belongs to |
1894 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
1895 | * |
1896 | * This is used directly by GPIO drivers that want to indicate | |
1897 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 1898 | */ |
e3a2e878 | 1899 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 1900 | { |
d74be6df | 1901 | if (offset >= chip->ngpio) |
d468bf9e | 1902 | return; |
d2876d08 | 1903 | |
1c3cdb18 | 1904 | clear_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
d468bf9e | 1905 | } |
e3a2e878 | 1906 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 1907 | |
6cee3821 LW |
1908 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
1909 | { | |
1910 | if (offset >= chip->ngpio) | |
1911 | return false; | |
1912 | ||
1913 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
1914 | } | |
1915 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
1916 | ||
143b65d6 LW |
1917 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
1918 | { | |
1919 | if (offset >= chip->ngpio) | |
1920 | return false; | |
1921 | ||
1922 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
1923 | } | |
1924 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
1925 | ||
1926 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
1927 | { | |
1928 | if (offset >= chip->ngpio) | |
1929 | return false; | |
1930 | ||
1931 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
1932 | } | |
1933 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
1934 | ||
79a9becd AC |
1935 | /** |
1936 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
1937 | * @desc: gpio whose value will be returned | |
1938 | * | |
1939 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 1940 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
1941 | * |
1942 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 1943 | */ |
79a9becd | 1944 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 1945 | { |
d2876d08 | 1946 | might_sleep_if(extra_checks); |
fdeb8e15 | 1947 | VALIDATE_DESC(desc); |
79a9becd | 1948 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1949 | } |
79a9becd | 1950 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 1951 | |
79a9becd AC |
1952 | /** |
1953 | * gpiod_get_value_cansleep() - return a gpio's value | |
1954 | * @desc: gpio whose value will be returned | |
1955 | * | |
1956 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 1957 | * account, or negative errno on failure. |
79a9becd AC |
1958 | * |
1959 | * This function is to be called from contexts that can sleep. | |
1960 | */ | |
1961 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 1962 | { |
3f397c21 | 1963 | int value; |
d2876d08 DB |
1964 | |
1965 | might_sleep_if(extra_checks); | |
fdeb8e15 | 1966 | VALIDATE_DESC(desc); |
79a9becd | 1967 | value = _gpiod_get_raw_value(desc); |
e20538b8 BA |
1968 | if (value < 0) |
1969 | return value; | |
1970 | ||
79a9becd AC |
1971 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1972 | value = !value; | |
1973 | ||
3f397c21 | 1974 | return value; |
d2876d08 | 1975 | } |
79a9becd | 1976 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 1977 | |
79a9becd AC |
1978 | /** |
1979 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
1980 | * @desc: gpio whose value will be assigned | |
1981 | * @value: value to assign | |
1982 | * | |
1983 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
1984 | * regard for its ACTIVE_LOW status. | |
1985 | * | |
1986 | * This function is to be called from contexts that can sleep. | |
1987 | */ | |
1988 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 1989 | { |
d2876d08 | 1990 | might_sleep_if(extra_checks); |
fdeb8e15 | 1991 | VALIDATE_DESC_VOID(desc); |
79a9becd | 1992 | _gpiod_set_raw_value(desc, value); |
372e722e | 1993 | } |
79a9becd | 1994 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 1995 | |
79a9becd AC |
1996 | /** |
1997 | * gpiod_set_value_cansleep() - assign a gpio's value | |
1998 | * @desc: gpio whose value will be assigned | |
1999 | * @value: value to assign | |
2000 | * | |
2001 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2002 | * account | |
2003 | * | |
2004 | * This function is to be called from contexts that can sleep. | |
2005 | */ | |
2006 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 2007 | { |
d2876d08 | 2008 | might_sleep_if(extra_checks); |
fdeb8e15 | 2009 | VALIDATE_DESC_VOID(desc); |
79a9becd AC |
2010 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2011 | value = !value; | |
2012 | _gpiod_set_raw_value(desc, value); | |
372e722e | 2013 | } |
79a9becd | 2014 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 2015 | |
5f424243 | 2016 | /** |
3fff99bc | 2017 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2018 | * @array_size: number of elements in the descriptor / value arrays |
2019 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2020 | * @value_array: array of values to assign | |
2021 | * | |
2022 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2023 | * without regard for their ACTIVE_LOW status. | |
2024 | * | |
2025 | * This function is to be called from contexts that can sleep. | |
2026 | */ | |
3fff99bc RI |
2027 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
2028 | struct gpio_desc **desc_array, | |
2029 | int *value_array) | |
5f424243 RI |
2030 | { |
2031 | might_sleep_if(extra_checks); | |
2032 | if (!desc_array) | |
2033 | return; | |
3fff99bc RI |
2034 | gpiod_set_array_value_priv(true, true, array_size, desc_array, |
2035 | value_array); | |
5f424243 | 2036 | } |
3fff99bc | 2037 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 RI |
2038 | |
2039 | /** | |
3fff99bc | 2040 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2041 | * @array_size: number of elements in the descriptor / value arrays |
2042 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2043 | * @value_array: array of values to assign | |
2044 | * | |
2045 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2046 | * into account. | |
2047 | * | |
2048 | * This function is to be called from contexts that can sleep. | |
2049 | */ | |
3fff99bc RI |
2050 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
2051 | struct gpio_desc **desc_array, | |
2052 | int *value_array) | |
5f424243 RI |
2053 | { |
2054 | might_sleep_if(extra_checks); | |
2055 | if (!desc_array) | |
2056 | return; | |
3fff99bc RI |
2057 | gpiod_set_array_value_priv(false, true, array_size, desc_array, |
2058 | value_array); | |
5f424243 | 2059 | } |
3fff99bc | 2060 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 2061 | |
bae48da2 | 2062 | /** |
ad824783 AC |
2063 | * gpiod_add_lookup_table() - register GPIO device consumers |
2064 | * @table: table of consumers to register | |
bae48da2 | 2065 | */ |
ad824783 | 2066 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
2067 | { |
2068 | mutex_lock(&gpio_lookup_lock); | |
2069 | ||
ad824783 | 2070 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
2071 | |
2072 | mutex_unlock(&gpio_lookup_lock); | |
2073 | } | |
2074 | ||
be9015ab SK |
2075 | /** |
2076 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
2077 | * @table: table of consumers to unregister | |
2078 | */ | |
2079 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
2080 | { | |
2081 | mutex_lock(&gpio_lookup_lock); | |
2082 | ||
2083 | list_del(&table->list); | |
2084 | ||
2085 | mutex_unlock(&gpio_lookup_lock); | |
2086 | } | |
2087 | ||
bae48da2 | 2088 | static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
2089 | unsigned int idx, |
2090 | enum gpio_lookup_flags *flags) | |
bae48da2 AC |
2091 | { |
2092 | char prop_name[32]; /* 32 is max size of property name */ | |
2093 | enum of_gpio_flags of_flags; | |
2094 | struct gpio_desc *desc; | |
dd34c37a | 2095 | unsigned int i; |
bae48da2 | 2096 | |
7f2e553a | 2097 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
dd34c37a | 2098 | if (con_id) |
9e089246 | 2099 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, |
7f2e553a | 2100 | gpio_suffixes[i]); |
dd34c37a | 2101 | else |
9e089246 | 2102 | snprintf(prop_name, sizeof(prop_name), "%s", |
7f2e553a | 2103 | gpio_suffixes[i]); |
bae48da2 | 2104 | |
dd34c37a TR |
2105 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, |
2106 | &of_flags); | |
06fc3b70 | 2107 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) |
dd34c37a TR |
2108 | break; |
2109 | } | |
bae48da2 AC |
2110 | |
2111 | if (IS_ERR(desc)) | |
2112 | return desc; | |
2113 | ||
2114 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
53e7cac3 | 2115 | *flags |= GPIO_ACTIVE_LOW; |
bae48da2 | 2116 | |
90b665f6 LP |
2117 | if (of_flags & OF_GPIO_SINGLE_ENDED) { |
2118 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
2119 | *flags |= GPIO_OPEN_DRAIN; | |
2120 | else | |
2121 | *flags |= GPIO_OPEN_SOURCE; | |
2122 | } | |
2123 | ||
bae48da2 AC |
2124 | return desc; |
2125 | } | |
d2876d08 | 2126 | |
81f59e9d | 2127 | static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
2128 | unsigned int idx, |
2129 | enum gpio_lookup_flags *flags) | |
372e722e | 2130 | { |
0d9a693c | 2131 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e01f440a MW |
2132 | struct acpi_gpio_info info; |
2133 | struct gpio_desc *desc; | |
0d9a693c MW |
2134 | char propname[32]; |
2135 | int i; | |
e01f440a | 2136 | |
0d9a693c | 2137 | /* Try first from _DSD */ |
7f2e553a | 2138 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
0d9a693c MW |
2139 | if (con_id && strcmp(con_id, "gpios")) { |
2140 | snprintf(propname, sizeof(propname), "%s-%s", | |
7f2e553a | 2141 | con_id, gpio_suffixes[i]); |
0d9a693c MW |
2142 | } else { |
2143 | snprintf(propname, sizeof(propname), "%s", | |
7f2e553a | 2144 | gpio_suffixes[i]); |
0d9a693c MW |
2145 | } |
2146 | ||
2147 | desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); | |
2148 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) | |
2149 | break; | |
2150 | } | |
2151 | ||
2152 | /* Then from plain _CRS GPIOs */ | |
2153 | if (IS_ERR(desc)) { | |
10cf4899 DT |
2154 | if (!acpi_can_fallback_to_crs(adev, con_id)) |
2155 | return ERR_PTR(-ENOENT); | |
2156 | ||
0d9a693c MW |
2157 | desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); |
2158 | if (IS_ERR(desc)) | |
2159 | return desc; | |
2160 | } | |
e01f440a | 2161 | |
52044723 | 2162 | if (info.polarity == GPIO_ACTIVE_LOW) |
53e7cac3 | 2163 | *flags |= GPIO_ACTIVE_LOW; |
e01f440a MW |
2164 | |
2165 | return desc; | |
81f59e9d MW |
2166 | } |
2167 | ||
ad824783 | 2168 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
2169 | { |
2170 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 2171 | struct gpiod_lookup_table *table; |
bae48da2 AC |
2172 | |
2173 | mutex_lock(&gpio_lookup_lock); | |
2174 | ||
ad824783 AC |
2175 | list_for_each_entry(table, &gpio_lookup_list, list) { |
2176 | if (table->dev_id && dev_id) { | |
2177 | /* | |
2178 | * Valid strings on both ends, must be identical to have | |
2179 | * a match | |
2180 | */ | |
2181 | if (!strcmp(table->dev_id, dev_id)) | |
2182 | goto found; | |
2183 | } else { | |
2184 | /* | |
2185 | * One of the pointers is NULL, so both must be to have | |
2186 | * a match | |
2187 | */ | |
2188 | if (dev_id == table->dev_id) | |
2189 | goto found; | |
2190 | } | |
2191 | } | |
2192 | table = NULL; | |
bae48da2 | 2193 | |
ad824783 AC |
2194 | found: |
2195 | mutex_unlock(&gpio_lookup_lock); | |
2196 | return table; | |
2197 | } | |
bae48da2 | 2198 | |
ad824783 AC |
2199 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
2200 | unsigned int idx, | |
2201 | enum gpio_lookup_flags *flags) | |
2202 | { | |
2a3cf6a3 | 2203 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
2204 | struct gpiod_lookup_table *table; |
2205 | struct gpiod_lookup *p; | |
bae48da2 | 2206 | |
ad824783 AC |
2207 | table = gpiod_find_lookup_table(dev); |
2208 | if (!table) | |
2209 | return desc; | |
bae48da2 | 2210 | |
ad824783 AC |
2211 | for (p = &table->table[0]; p->chip_label; p++) { |
2212 | struct gpio_chip *chip; | |
bae48da2 | 2213 | |
ad824783 | 2214 | /* idx must always match exactly */ |
bae48da2 AC |
2215 | if (p->idx != idx) |
2216 | continue; | |
2217 | ||
ad824783 AC |
2218 | /* If the lookup entry has a con_id, require exact match */ |
2219 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
2220 | continue; | |
bae48da2 | 2221 | |
ad824783 | 2222 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 2223 | |
ad824783 | 2224 | if (!chip) { |
2a3cf6a3 AC |
2225 | dev_err(dev, "cannot find GPIO chip %s\n", |
2226 | p->chip_label); | |
2227 | return ERR_PTR(-ENODEV); | |
ad824783 | 2228 | } |
bae48da2 | 2229 | |
ad824783 | 2230 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
2231 | dev_err(dev, |
2232 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
2233 | idx, chip->ngpio, chip->label); | |
2234 | return ERR_PTR(-EINVAL); | |
bae48da2 | 2235 | } |
bae48da2 | 2236 | |
bb1e88cc | 2237 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 2238 | *flags = p->flags; |
bae48da2 | 2239 | |
2a3cf6a3 | 2240 | return desc; |
bae48da2 AC |
2241 | } |
2242 | ||
bae48da2 AC |
2243 | return desc; |
2244 | } | |
2245 | ||
66858527 RI |
2246 | static int dt_gpio_count(struct device *dev, const char *con_id) |
2247 | { | |
2248 | int ret; | |
2249 | char propname[32]; | |
2250 | unsigned int i; | |
2251 | ||
2252 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
2253 | if (con_id) | |
2254 | snprintf(propname, sizeof(propname), "%s-%s", | |
2255 | con_id, gpio_suffixes[i]); | |
2256 | else | |
2257 | snprintf(propname, sizeof(propname), "%s", | |
2258 | gpio_suffixes[i]); | |
2259 | ||
2260 | ret = of_gpio_named_count(dev->of_node, propname); | |
2261 | if (ret >= 0) | |
2262 | break; | |
2263 | } | |
2264 | return ret; | |
2265 | } | |
2266 | ||
2267 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
2268 | { | |
2269 | struct gpiod_lookup_table *table; | |
2270 | struct gpiod_lookup *p; | |
2271 | unsigned int count = 0; | |
2272 | ||
2273 | table = gpiod_find_lookup_table(dev); | |
2274 | if (!table) | |
2275 | return -ENOENT; | |
2276 | ||
2277 | for (p = &table->table[0]; p->chip_label; p++) { | |
2278 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
2279 | (!con_id && !p->con_id)) | |
2280 | count++; | |
2281 | } | |
2282 | if (!count) | |
2283 | return -ENOENT; | |
2284 | ||
2285 | return count; | |
2286 | } | |
2287 | ||
2288 | /** | |
2289 | * gpiod_count - return the number of GPIOs associated with a device / function | |
2290 | * or -ENOENT if no GPIO has been assigned to the requested function | |
2291 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2292 | * @con_id: function within the GPIO consumer | |
2293 | */ | |
2294 | int gpiod_count(struct device *dev, const char *con_id) | |
2295 | { | |
2296 | int count = -ENOENT; | |
2297 | ||
2298 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
2299 | count = dt_gpio_count(dev, con_id); | |
2300 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
2301 | count = acpi_gpio_count(dev, con_id); | |
2302 | ||
2303 | if (count < 0) | |
2304 | count = platform_gpio_count(dev, con_id); | |
2305 | ||
2306 | return count; | |
2307 | } | |
2308 | EXPORT_SYMBOL_GPL(gpiod_count); | |
2309 | ||
bae48da2 | 2310 | /** |
0879162f | 2311 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 2312 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 2313 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 2314 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2315 | * |
2316 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 2317 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 2318 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 2319 | */ |
b17d1bf1 | 2320 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 2321 | enum gpiod_flags flags) |
bae48da2 | 2322 | { |
39b2bbe3 | 2323 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 2324 | } |
b17d1bf1 | 2325 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 2326 | |
29a1f233 TR |
2327 | /** |
2328 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
2329 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2330 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 2331 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2332 | * |
2333 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
2334 | * the requested function it will return NULL. This is convenient for drivers | |
2335 | * that need to handle optional GPIOs. | |
2336 | */ | |
b17d1bf1 | 2337 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
2338 | const char *con_id, |
2339 | enum gpiod_flags flags) | |
29a1f233 | 2340 | { |
39b2bbe3 | 2341 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 2342 | } |
b17d1bf1 | 2343 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 2344 | |
923b93e4 LP |
2345 | /** |
2346 | * gpiod_parse_flags - helper function to parse GPIO lookup flags | |
2347 | * @desc: gpio to be setup | |
2348 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2349 | * of_get_gpio_hog() | |
2350 | * | |
2351 | * Set the GPIO descriptor flags based on the given GPIO lookup flags. | |
2352 | */ | |
2353 | static void gpiod_parse_flags(struct gpio_desc *desc, unsigned long lflags) | |
2354 | { | |
2355 | if (lflags & GPIO_ACTIVE_LOW) | |
2356 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2357 | if (lflags & GPIO_OPEN_DRAIN) | |
2358 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2359 | if (lflags & GPIO_OPEN_SOURCE) | |
2360 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2361 | } | |
f625d460 BP |
2362 | |
2363 | /** | |
2364 | * gpiod_configure_flags - helper function to configure a given GPIO | |
2365 | * @desc: gpio whose value will be assigned | |
2366 | * @con_id: function within the GPIO consumer | |
f625d460 BP |
2367 | * @dflags: gpiod_flags - optional GPIO initialization flags |
2368 | * | |
2369 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
2370 | * requested function and/or index, or another IS_ERR() code if an error | |
2371 | * occurred while trying to acquire the GPIO. | |
2372 | */ | |
2373 | static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, | |
923b93e4 | 2374 | enum gpiod_flags dflags) |
f625d460 BP |
2375 | { |
2376 | int status; | |
2377 | ||
f625d460 BP |
2378 | /* No particular flag request, return here... */ |
2379 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
2380 | pr_debug("no flags found for %s\n", con_id); | |
2381 | return 0; | |
2382 | } | |
2383 | ||
2384 | /* Process flags */ | |
2385 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
2386 | status = gpiod_direction_output(desc, | |
2387 | dflags & GPIOD_FLAGS_BIT_DIR_VAL); | |
2388 | else | |
2389 | status = gpiod_direction_input(desc); | |
2390 | ||
2391 | return status; | |
2392 | } | |
2393 | ||
bae48da2 AC |
2394 | /** |
2395 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 2396 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
2397 | * @con_id: function within the GPIO consumer |
2398 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2399 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2400 | * |
2401 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
2402 | * defined one for functions that define several GPIOs. | |
2403 | * | |
2a3cf6a3 AC |
2404 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
2405 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 2406 | * occurred while trying to acquire the GPIO. |
bae48da2 | 2407 | */ |
b17d1bf1 | 2408 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 2409 | const char *con_id, |
39b2bbe3 AC |
2410 | unsigned int idx, |
2411 | enum gpiod_flags flags) | |
bae48da2 | 2412 | { |
35c5d7fd | 2413 | struct gpio_desc *desc = NULL; |
bae48da2 | 2414 | int status; |
39b2bbe3 | 2415 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
2416 | |
2417 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
2418 | ||
4d8440b9 RW |
2419 | if (dev) { |
2420 | /* Using device tree? */ | |
2421 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
2422 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
2423 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
2424 | } else if (ACPI_COMPANION(dev)) { | |
2425 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
2426 | desc = acpi_find_gpio(dev, con_id, idx, &lookupflags); | |
2427 | } | |
35c5d7fd AC |
2428 | } |
2429 | ||
2430 | /* | |
2431 | * Either we are not using DT or ACPI, or their lookup did not return | |
2432 | * a result. In that case, use platform lookup as a fallback. | |
2433 | */ | |
2a3cf6a3 | 2434 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 2435 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 2436 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
2437 | } |
2438 | ||
2439 | if (IS_ERR(desc)) { | |
351cfe0f | 2440 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
2441 | return desc; |
2442 | } | |
2443 | ||
923b93e4 LP |
2444 | gpiod_parse_flags(desc, lookupflags); |
2445 | ||
bae48da2 | 2446 | status = gpiod_request(desc, con_id); |
bae48da2 AC |
2447 | if (status < 0) |
2448 | return ERR_PTR(status); | |
2449 | ||
923b93e4 | 2450 | status = gpiod_configure_flags(desc, con_id, flags); |
39b2bbe3 AC |
2451 | if (status < 0) { |
2452 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
2453 | gpiod_put(desc); | |
2454 | return ERR_PTR(status); | |
2455 | } | |
2456 | ||
bae48da2 AC |
2457 | return desc; |
2458 | } | |
b17d1bf1 | 2459 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 2460 | |
40b73183 MW |
2461 | /** |
2462 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
2463 | * @fwnode: handle of the firmware node | |
2464 | * @propname: name of the firmware property representing the GPIO | |
2465 | * | |
2466 | * This function can be used for drivers that get their configuration | |
2467 | * from firmware. | |
2468 | * | |
2469 | * Function properly finds the corresponding GPIO using whatever is the | |
2470 | * underlying firmware interface and then makes sure that the GPIO | |
2471 | * descriptor is requested before it is returned to the caller. | |
2472 | * | |
2473 | * In case of error an ERR_PTR() is returned. | |
2474 | */ | |
2475 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
2476 | const char *propname) | |
2477 | { | |
2478 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
2479 | bool active_low = false; | |
90b665f6 | 2480 | bool single_ended = false; |
40b73183 MW |
2481 | int ret; |
2482 | ||
2483 | if (!fwnode) | |
2484 | return ERR_PTR(-EINVAL); | |
2485 | ||
2486 | if (is_of_node(fwnode)) { | |
2487 | enum of_gpio_flags flags; | |
2488 | ||
c181fb3e | 2489 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0, |
40b73183 | 2490 | &flags); |
90b665f6 | 2491 | if (!IS_ERR(desc)) { |
40b73183 | 2492 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
90b665f6 LP |
2493 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
2494 | } | |
40b73183 MW |
2495 | } else if (is_acpi_node(fwnode)) { |
2496 | struct acpi_gpio_info info; | |
2497 | ||
504a3374 | 2498 | desc = acpi_node_get_gpiod(fwnode, propname, 0, &info); |
40b73183 | 2499 | if (!IS_ERR(desc)) |
52044723 | 2500 | active_low = info.polarity == GPIO_ACTIVE_LOW; |
40b73183 MW |
2501 | } |
2502 | ||
2503 | if (IS_ERR(desc)) | |
2504 | return desc; | |
2505 | ||
40b73183 MW |
2506 | if (active_low) |
2507 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2508 | ||
90b665f6 LP |
2509 | if (single_ended) { |
2510 | if (active_low) | |
2511 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2512 | else | |
2513 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2514 | } | |
2515 | ||
923b93e4 LP |
2516 | ret = gpiod_request(desc, NULL); |
2517 | if (ret) | |
2518 | return ERR_PTR(ret); | |
2519 | ||
40b73183 MW |
2520 | return desc; |
2521 | } | |
2522 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
2523 | ||
29a1f233 TR |
2524 | /** |
2525 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
2526 | * function | |
2527 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2528 | * @con_id: function within the GPIO consumer | |
2529 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2530 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2531 | * |
2532 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
2533 | * specified index was assigned to the requested function it will return NULL. | |
2534 | * This is convenient for drivers that need to handle optional GPIOs. | |
2535 | */ | |
b17d1bf1 | 2536 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 2537 | const char *con_id, |
39b2bbe3 AC |
2538 | unsigned int index, |
2539 | enum gpiod_flags flags) | |
29a1f233 TR |
2540 | { |
2541 | struct gpio_desc *desc; | |
2542 | ||
39b2bbe3 | 2543 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
2544 | if (IS_ERR(desc)) { |
2545 | if (PTR_ERR(desc) == -ENOENT) | |
2546 | return NULL; | |
2547 | } | |
2548 | ||
2549 | return desc; | |
2550 | } | |
b17d1bf1 | 2551 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 2552 | |
f625d460 BP |
2553 | /** |
2554 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
2555 | * @desc: gpio whose value will be assigned | |
2556 | * @name: gpio line name | |
2557 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2558 | * of_get_gpio_hog() | |
2559 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
2560 | */ | |
2561 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
2562 | unsigned long lflags, enum gpiod_flags dflags) | |
2563 | { | |
2564 | struct gpio_chip *chip; | |
2565 | struct gpio_desc *local_desc; | |
2566 | int hwnum; | |
2567 | int status; | |
2568 | ||
2569 | chip = gpiod_to_chip(desc); | |
2570 | hwnum = gpio_chip_hwgpio(desc); | |
2571 | ||
923b93e4 LP |
2572 | gpiod_parse_flags(desc, lflags); |
2573 | ||
f625d460 BP |
2574 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); |
2575 | if (IS_ERR(local_desc)) { | |
a713890d LW |
2576 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed\n", |
2577 | name, chip->label, hwnum); | |
f625d460 BP |
2578 | return PTR_ERR(local_desc); |
2579 | } | |
2580 | ||
923b93e4 | 2581 | status = gpiod_configure_flags(desc, name, dflags); |
f625d460 | 2582 | if (status < 0) { |
a713890d LW |
2583 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed\n", |
2584 | name, chip->label, hwnum); | |
f625d460 BP |
2585 | gpiochip_free_own_desc(desc); |
2586 | return status; | |
2587 | } | |
2588 | ||
2589 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
2590 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
2591 | ||
2592 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
2593 | desc_to_gpio(desc), name, | |
2594 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
2595 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
2596 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
2597 | ||
2598 | return 0; | |
2599 | } | |
2600 | ||
2601 | /** | |
2602 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
2603 | * @chip: gpio chip to act on | |
2604 | * | |
2605 | * This is only used by of_gpiochip_remove to free hogged gpios | |
2606 | */ | |
2607 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
2608 | { | |
2609 | int id; | |
2610 | ||
2611 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
2612 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
2613 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
2614 | } |
2615 | } | |
2616 | ||
66858527 RI |
2617 | /** |
2618 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
2619 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2620 | * @con_id: function within the GPIO consumer | |
2621 | * @flags: optional GPIO initialization flags | |
2622 | * | |
2623 | * This function acquires all the GPIOs defined under a given function. | |
2624 | * | |
2625 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
2626 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
2627 | * code if an error occurred while trying to acquire the GPIOs. | |
2628 | */ | |
2629 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
2630 | const char *con_id, | |
2631 | enum gpiod_flags flags) | |
2632 | { | |
2633 | struct gpio_desc *desc; | |
2634 | struct gpio_descs *descs; | |
2635 | int count; | |
2636 | ||
2637 | count = gpiod_count(dev, con_id); | |
2638 | if (count < 0) | |
2639 | return ERR_PTR(count); | |
2640 | ||
2641 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
2642 | GFP_KERNEL); | |
2643 | if (!descs) | |
2644 | return ERR_PTR(-ENOMEM); | |
2645 | ||
2646 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
2647 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
2648 | if (IS_ERR(desc)) { | |
2649 | gpiod_put_array(descs); | |
2650 | return ERR_CAST(desc); | |
2651 | } | |
2652 | descs->desc[descs->ndescs] = desc; | |
2653 | descs->ndescs++; | |
2654 | } | |
2655 | return descs; | |
2656 | } | |
2657 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
2658 | ||
2659 | /** | |
2660 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
2661 | * function | |
2662 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2663 | * @con_id: function within the GPIO consumer | |
2664 | * @flags: optional GPIO initialization flags | |
2665 | * | |
2666 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
2667 | * assigned to the requested function it will return NULL. | |
2668 | */ | |
2669 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
2670 | const char *con_id, | |
2671 | enum gpiod_flags flags) | |
2672 | { | |
2673 | struct gpio_descs *descs; | |
2674 | ||
2675 | descs = gpiod_get_array(dev, con_id, flags); | |
2676 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
2677 | return NULL; | |
2678 | ||
2679 | return descs; | |
2680 | } | |
2681 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
2682 | ||
bae48da2 AC |
2683 | /** |
2684 | * gpiod_put - dispose of a GPIO descriptor | |
2685 | * @desc: GPIO descriptor to dispose of | |
2686 | * | |
2687 | * No descriptor can be used after gpiod_put() has been called on it. | |
2688 | */ | |
2689 | void gpiod_put(struct gpio_desc *desc) | |
2690 | { | |
2691 | gpiod_free(desc); | |
372e722e | 2692 | } |
bae48da2 | 2693 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 2694 | |
66858527 RI |
2695 | /** |
2696 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
2697 | * @descs: struct gpio_descs containing an array of descriptors | |
2698 | */ | |
2699 | void gpiod_put_array(struct gpio_descs *descs) | |
2700 | { | |
2701 | unsigned int i; | |
2702 | ||
2703 | for (i = 0; i < descs->ndescs; i++) | |
2704 | gpiod_put(descs->desc[i]); | |
2705 | ||
2706 | kfree(descs); | |
2707 | } | |
2708 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
2709 | ||
3c702e99 LW |
2710 | static int __init gpiolib_dev_init(void) |
2711 | { | |
2712 | int ret; | |
2713 | ||
2714 | /* Register GPIO sysfs bus */ | |
2715 | ret = bus_register(&gpio_bus_type); | |
2716 | if (ret < 0) { | |
2717 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
2718 | return ret; | |
2719 | } | |
2720 | ||
2721 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
2722 | if (ret < 0) { | |
2723 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
2724 | bus_unregister(&gpio_bus_type); | |
2725 | } | |
2726 | return ret; | |
2727 | } | |
2728 | core_initcall(gpiolib_dev_init); | |
2729 | ||
d2876d08 DB |
2730 | #ifdef CONFIG_DEBUG_FS |
2731 | ||
fdeb8e15 | 2732 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
2733 | { |
2734 | unsigned i; | |
fdeb8e15 LW |
2735 | struct gpio_chip *chip = gdev->chip; |
2736 | unsigned gpio = gdev->base; | |
2737 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 2738 | int is_out; |
d468bf9e | 2739 | int is_irq; |
d2876d08 | 2740 | |
fdeb8e15 | 2741 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
2742 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
2743 | if (gdesc->name) { | |
2744 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
2745 | gpio, gdesc->name); | |
2746 | } | |
d2876d08 | 2747 | continue; |
ced433e2 | 2748 | } |
d2876d08 | 2749 | |
372e722e | 2750 | gpiod_get_direction(gdesc); |
d2876d08 | 2751 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 2752 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
2753 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
2754 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
2755 | is_out ? "out" : "in ", |
2756 | chip->get | |
2757 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
2758 | : "? ", |
2759 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
2760 | seq_printf(s, "\n"); |
2761 | } | |
2762 | } | |
2763 | ||
f9c4a31f | 2764 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 2765 | { |
362432ae | 2766 | unsigned long flags; |
ff2b1359 | 2767 | struct gpio_device *gdev = NULL; |
cb1650d4 | 2768 | loff_t index = *pos; |
d2876d08 | 2769 | |
f9c4a31f | 2770 | s->private = ""; |
d2876d08 | 2771 | |
362432ae | 2772 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 2773 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
2774 | if (index-- == 0) { |
2775 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 2776 | return gdev; |
f9c4a31f | 2777 | } |
362432ae | 2778 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 2779 | |
cb1650d4 | 2780 | return NULL; |
f9c4a31f TR |
2781 | } |
2782 | ||
2783 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2784 | { | |
362432ae | 2785 | unsigned long flags; |
ff2b1359 | 2786 | struct gpio_device *gdev = v; |
f9c4a31f TR |
2787 | void *ret = NULL; |
2788 | ||
362432ae | 2789 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 2790 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
2791 | ret = NULL; |
2792 | else | |
ff2b1359 | 2793 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 2794 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
2795 | |
2796 | s->private = "\n"; | |
2797 | ++*pos; | |
2798 | ||
2799 | return ret; | |
2800 | } | |
2801 | ||
2802 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
2803 | { | |
2804 | } | |
2805 | ||
2806 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
2807 | { | |
ff2b1359 LW |
2808 | struct gpio_device *gdev = v; |
2809 | struct gpio_chip *chip = gdev->chip; | |
2810 | struct device *parent; | |
2811 | ||
2812 | if (!chip) { | |
2813 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
2814 | dev_name(&gdev->dev)); | |
2815 | return 0; | |
2816 | } | |
f9c4a31f | 2817 | |
ff2b1359 LW |
2818 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
2819 | dev_name(&gdev->dev), | |
fdeb8e15 | 2820 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
2821 | parent = chip->parent; |
2822 | if (parent) | |
2823 | seq_printf(s, ", parent: %s/%s", | |
2824 | parent->bus ? parent->bus->name : "no-bus", | |
2825 | dev_name(parent)); | |
f9c4a31f TR |
2826 | if (chip->label) |
2827 | seq_printf(s, ", %s", chip->label); | |
2828 | if (chip->can_sleep) | |
2829 | seq_printf(s, ", can sleep"); | |
2830 | seq_printf(s, ":\n"); | |
2831 | ||
2832 | if (chip->dbg_show) | |
2833 | chip->dbg_show(s, chip); | |
2834 | else | |
fdeb8e15 | 2835 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 2836 | |
d2876d08 DB |
2837 | return 0; |
2838 | } | |
2839 | ||
f9c4a31f TR |
2840 | static const struct seq_operations gpiolib_seq_ops = { |
2841 | .start = gpiolib_seq_start, | |
2842 | .next = gpiolib_seq_next, | |
2843 | .stop = gpiolib_seq_stop, | |
2844 | .show = gpiolib_seq_show, | |
2845 | }; | |
2846 | ||
d2876d08 DB |
2847 | static int gpiolib_open(struct inode *inode, struct file *file) |
2848 | { | |
f9c4a31f | 2849 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
2850 | } |
2851 | ||
828c0950 | 2852 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 2853 | .owner = THIS_MODULE, |
d2876d08 DB |
2854 | .open = gpiolib_open, |
2855 | .read = seq_read, | |
2856 | .llseek = seq_lseek, | |
f9c4a31f | 2857 | .release = seq_release, |
d2876d08 DB |
2858 | }; |
2859 | ||
2860 | static int __init gpiolib_debugfs_init(void) | |
2861 | { | |
2862 | /* /sys/kernel/debug/gpio */ | |
2863 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
2864 | NULL, NULL, &gpiolib_operations); | |
2865 | return 0; | |
2866 | } | |
2867 | subsys_initcall(gpiolib_debugfs_init); | |
2868 | ||
2869 | #endif /* DEBUG_FS */ |