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6048a3dd CM |
1 | /* |
2 | * htc-i2cpld.c | |
3 | * Chip driver for an unknown CPLD chip found on omap850 HTC devices like | |
4 | * the HTC Wizard and HTC Herald. | |
5 | * The cpld is located on the i2c bus and acts as an input/output GPIO | |
6 | * extender. | |
7 | * | |
8 | * Copyright (C) 2009 Cory Maccarrone <darkstar6262@gmail.com> | |
9 | * | |
10 | * Based on work done in the linwizard project | |
11 | * Copyright (C) 2008-2009 Angelo Arrifano <miknix@gmail.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | */ | |
27 | ||
28 | #include <linux/kernel.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/platform_device.h> | |
33 | #include <linux/i2c.h> | |
34 | #include <linux/irq.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/htcpld.h> | |
37 | #include <linux/gpio.h> | |
5a0e3ad6 | 38 | #include <linux/slab.h> |
6048a3dd CM |
39 | |
40 | struct htcpld_chip { | |
41 | spinlock_t lock; | |
42 | ||
43 | /* chip info */ | |
44 | u8 reset; | |
45 | u8 addr; | |
46 | struct device *dev; | |
47 | struct i2c_client *client; | |
48 | ||
49 | /* Output details */ | |
50 | u8 cache_out; | |
51 | struct gpio_chip chip_out; | |
52 | ||
53 | /* Input details */ | |
54 | u8 cache_in; | |
55 | struct gpio_chip chip_in; | |
56 | ||
57 | u16 irqs_enabled; | |
58 | uint irq_start; | |
59 | int nirqs; | |
60 | ||
9eaee99e | 61 | unsigned int flow_type; |
6048a3dd CM |
62 | /* |
63 | * Work structure to allow for setting values outside of any | |
64 | * possible interrupt context | |
65 | */ | |
66 | struct work_struct set_val_work; | |
67 | }; | |
68 | ||
69 | struct htcpld_data { | |
70 | /* irq info */ | |
71 | u16 irqs_enabled; | |
72 | uint irq_start; | |
73 | int nirqs; | |
74 | uint chained_irq; | |
75 | unsigned int int_reset_gpio_hi; | |
76 | unsigned int int_reset_gpio_lo; | |
77 | ||
78 | /* htcpld info */ | |
79 | struct htcpld_chip *chip; | |
80 | unsigned int nchips; | |
81 | }; | |
82 | ||
83 | /* There does not appear to be a way to proactively mask interrupts | |
84 | * on the htcpld chip itself. So, we simply ignore interrupts that | |
85 | * aren't desired. */ | |
e6a4c4a4 | 86 | static void htcpld_mask(struct irq_data *data) |
6048a3dd | 87 | { |
e6a4c4a4 MB |
88 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
89 | chip->irqs_enabled &= ~(1 << (data->irq - chip->irq_start)); | |
90 | pr_debug("HTCPLD mask %d %04x\n", data->irq, chip->irqs_enabled); | |
6048a3dd | 91 | } |
e6a4c4a4 | 92 | static void htcpld_unmask(struct irq_data *data) |
6048a3dd | 93 | { |
e6a4c4a4 MB |
94 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
95 | chip->irqs_enabled |= 1 << (data->irq - chip->irq_start); | |
96 | pr_debug("HTCPLD unmask %d %04x\n", data->irq, chip->irqs_enabled); | |
6048a3dd CM |
97 | } |
98 | ||
e6a4c4a4 | 99 | static int htcpld_set_type(struct irq_data *data, unsigned int flags) |
6048a3dd | 100 | { |
9eaee99e | 101 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
6048a3dd CM |
102 | |
103 | if (flags & ~IRQ_TYPE_SENSE_MASK) | |
104 | return -EINVAL; | |
105 | ||
106 | /* We only allow edge triggering */ | |
107 | if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)) | |
108 | return -EINVAL; | |
109 | ||
9eaee99e | 110 | chip->flow_type = flags; |
6048a3dd CM |
111 | return 0; |
112 | } | |
113 | ||
114 | static struct irq_chip htcpld_muxed_chip = { | |
e6a4c4a4 MB |
115 | .name = "htcpld", |
116 | .irq_mask = htcpld_mask, | |
117 | .irq_unmask = htcpld_unmask, | |
118 | .irq_set_type = htcpld_set_type, | |
6048a3dd CM |
119 | }; |
120 | ||
121 | /* To properly dispatch IRQ events, we need to read from the | |
122 | * chip. This is an I2C action that could possibly sleep | |
123 | * (which is bad in interrupt context) -- so we use a threaded | |
124 | * interrupt handler to get around that. | |
125 | */ | |
126 | static irqreturn_t htcpld_handler(int irq, void *dev) | |
127 | { | |
128 | struct htcpld_data *htcpld = dev; | |
129 | unsigned int i; | |
130 | unsigned long flags; | |
131 | int irqpin; | |
6048a3dd CM |
132 | |
133 | if (!htcpld) { | |
134 | pr_debug("htcpld is null in ISR\n"); | |
135 | return IRQ_HANDLED; | |
136 | } | |
137 | ||
138 | /* | |
139 | * For each chip, do a read of the chip and trigger any interrupts | |
140 | * desired. The interrupts will be triggered from LSB to MSB (i.e. | |
141 | * bit 0 first, then bit 1, etc.) | |
142 | * | |
143 | * For chips that have no interrupt range specified, just skip 'em. | |
144 | */ | |
145 | for (i = 0; i < htcpld->nchips; i++) { | |
146 | struct htcpld_chip *chip = &htcpld->chip[i]; | |
147 | struct i2c_client *client; | |
148 | int val; | |
149 | unsigned long uval, old_val; | |
150 | ||
151 | if (!chip) { | |
152 | pr_debug("chip %d is null in ISR\n", i); | |
153 | continue; | |
154 | } | |
155 | ||
156 | if (chip->nirqs == 0) | |
157 | continue; | |
158 | ||
159 | client = chip->client; | |
160 | if (!client) { | |
161 | pr_debug("client %d is null in ISR\n", i); | |
162 | continue; | |
163 | } | |
164 | ||
165 | /* Scan the chip */ | |
166 | val = i2c_smbus_read_byte_data(client, chip->cache_out); | |
167 | if (val < 0) { | |
168 | /* Throw a warning and skip this chip */ | |
169 | dev_warn(chip->dev, "Unable to read from chip: %d\n", | |
170 | val); | |
171 | continue; | |
172 | } | |
173 | ||
174 | uval = (unsigned long)val; | |
175 | ||
176 | spin_lock_irqsave(&chip->lock, flags); | |
177 | ||
178 | /* Save away the old value so we can compare it */ | |
179 | old_val = chip->cache_in; | |
180 | ||
181 | /* Write the new value */ | |
182 | chip->cache_in = uval; | |
183 | ||
184 | spin_unlock_irqrestore(&chip->lock, flags); | |
185 | ||
186 | /* | |
187 | * For each bit in the data (starting at bit 0), trigger | |
188 | * associated interrupts. | |
189 | */ | |
190 | for (irqpin = 0; irqpin < chip->nirqs; irqpin++) { | |
9eaee99e | 191 | unsigned oldb, newb, type = chip->flow_type; |
6048a3dd CM |
192 | |
193 | irq = chip->irq_start + irqpin; | |
6048a3dd CM |
194 | |
195 | /* Run the IRQ handler, but only if the bit value | |
196 | * changed, and the proper flags are set */ | |
197 | oldb = (old_val >> irqpin) & 1; | |
198 | newb = (uval >> irqpin) & 1; | |
199 | ||
9eaee99e TG |
200 | if ((!oldb && newb && (type & IRQ_TYPE_EDGE_RISING)) || |
201 | (oldb && !newb && (type & IRQ_TYPE_EDGE_FALLING))) { | |
6048a3dd | 202 | pr_debug("fire IRQ %d\n", irqpin); |
9eaee99e | 203 | generic_handle_irq(irq); |
6048a3dd CM |
204 | } |
205 | } | |
206 | } | |
207 | ||
208 | /* | |
209 | * In order to continue receiving interrupts, the int_reset_gpio must | |
210 | * be asserted. | |
211 | */ | |
212 | if (htcpld->int_reset_gpio_hi) | |
213 | gpio_set_value(htcpld->int_reset_gpio_hi, 1); | |
214 | if (htcpld->int_reset_gpio_lo) | |
215 | gpio_set_value(htcpld->int_reset_gpio_lo, 0); | |
216 | ||
217 | return IRQ_HANDLED; | |
218 | } | |
219 | ||
220 | /* | |
221 | * The GPIO set routines can be called from interrupt context, especially if, | |
222 | * for example they're attached to the led-gpio framework and a trigger is | |
223 | * enabled. As such, we declared work above in the htcpld_chip structure, | |
224 | * and that work is scheduled in the set routine. The kernel can then run | |
225 | * the I2C functions, which will sleep, in process context. | |
226 | */ | |
8d2d3a3a | 227 | static void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val) |
6048a3dd CM |
228 | { |
229 | struct i2c_client *client; | |
230 | struct htcpld_chip *chip_data; | |
231 | unsigned long flags; | |
232 | ||
233 | chip_data = container_of(chip, struct htcpld_chip, chip_out); | |
234 | if (!chip_data) | |
235 | return; | |
236 | ||
237 | client = chip_data->client; | |
238 | if (client == NULL) | |
239 | return; | |
240 | ||
241 | spin_lock_irqsave(&chip_data->lock, flags); | |
242 | if (val) | |
243 | chip_data->cache_out |= (1 << offset); | |
244 | else | |
245 | chip_data->cache_out &= ~(1 << offset); | |
246 | spin_unlock_irqrestore(&chip_data->lock, flags); | |
247 | ||
248 | schedule_work(&(chip_data->set_val_work)); | |
249 | } | |
250 | ||
8d2d3a3a | 251 | static void htcpld_chip_set_ni(struct work_struct *work) |
6048a3dd CM |
252 | { |
253 | struct htcpld_chip *chip_data; | |
254 | struct i2c_client *client; | |
255 | ||
256 | chip_data = container_of(work, struct htcpld_chip, set_val_work); | |
257 | client = chip_data->client; | |
258 | i2c_smbus_read_byte_data(client, chip_data->cache_out); | |
259 | } | |
260 | ||
8d2d3a3a | 261 | static int htcpld_chip_get(struct gpio_chip *chip, unsigned offset) |
6048a3dd CM |
262 | { |
263 | struct htcpld_chip *chip_data; | |
264 | int val = 0; | |
265 | int is_input = 0; | |
266 | ||
267 | /* Try out first */ | |
268 | chip_data = container_of(chip, struct htcpld_chip, chip_out); | |
269 | if (!chip_data) { | |
270 | /* Try in */ | |
271 | is_input = 1; | |
272 | chip_data = container_of(chip, struct htcpld_chip, chip_in); | |
273 | if (!chip_data) | |
274 | return -EINVAL; | |
275 | } | |
276 | ||
277 | /* Determine if this is an input or output GPIO */ | |
278 | if (!is_input) | |
279 | /* Use the output cache */ | |
280 | val = (chip_data->cache_out >> offset) & 1; | |
281 | else | |
282 | /* Use the input cache */ | |
283 | val = (chip_data->cache_in >> offset) & 1; | |
284 | ||
285 | if (val) | |
286 | return 1; | |
287 | else | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static int htcpld_direction_output(struct gpio_chip *chip, | |
292 | unsigned offset, int value) | |
293 | { | |
294 | htcpld_chip_set(chip, offset, value); | |
295 | return 0; | |
296 | } | |
297 | ||
298 | static int htcpld_direction_input(struct gpio_chip *chip, | |
299 | unsigned offset) | |
300 | { | |
301 | /* | |
302 | * No-op: this function can only be called on the input chip. | |
303 | * We do however make sure the offset is within range. | |
304 | */ | |
305 | return (offset < chip->ngpio) ? 0 : -EINVAL; | |
306 | } | |
307 | ||
8d2d3a3a | 308 | static int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset) |
6048a3dd CM |
309 | { |
310 | struct htcpld_chip *chip_data; | |
311 | ||
312 | chip_data = container_of(chip, struct htcpld_chip, chip_in); | |
313 | ||
314 | if (offset < chip_data->nirqs) | |
315 | return chip_data->irq_start + offset; | |
316 | else | |
317 | return -EINVAL; | |
318 | } | |
319 | ||
8d2d3a3a | 320 | static void htcpld_chip_reset(struct i2c_client *client) |
6048a3dd CM |
321 | { |
322 | struct htcpld_chip *chip_data = i2c_get_clientdata(client); | |
323 | if (!chip_data) | |
324 | return; | |
325 | ||
326 | i2c_smbus_read_byte_data( | |
327 | client, (chip_data->cache_out = chip_data->reset)); | |
328 | } | |
329 | ||
330 | static int __devinit htcpld_setup_chip_irq( | |
331 | struct platform_device *pdev, | |
332 | int chip_index) | |
333 | { | |
334 | struct htcpld_data *htcpld; | |
335 | struct device *dev = &pdev->dev; | |
336 | struct htcpld_core_platform_data *pdata; | |
337 | struct htcpld_chip *chip; | |
338 | struct htcpld_chip_platform_data *plat_chip_data; | |
339 | unsigned int irq, irq_end; | |
340 | int ret = 0; | |
341 | ||
342 | /* Get the platform and driver data */ | |
343 | pdata = dev->platform_data; | |
344 | htcpld = platform_get_drvdata(pdev); | |
345 | chip = &htcpld->chip[chip_index]; | |
346 | plat_chip_data = &pdata->chip[chip_index]; | |
347 | ||
348 | /* Setup irq handlers */ | |
349 | irq_end = chip->irq_start + chip->nirqs; | |
350 | for (irq = chip->irq_start; irq < irq_end; irq++) { | |
d6f7ce9f TG |
351 | irq_set_chip_and_handler(irq, &htcpld_muxed_chip, |
352 | handle_simple_irq); | |
d5bb1221 | 353 | irq_set_chip_data(irq, chip); |
6048a3dd CM |
354 | #ifdef CONFIG_ARM |
355 | set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); | |
356 | #else | |
d5bb1221 | 357 | irq_set_probe(irq); |
6048a3dd CM |
358 | #endif |
359 | } | |
360 | ||
361 | return ret; | |
362 | } | |
363 | ||
364 | static int __devinit htcpld_register_chip_i2c( | |
365 | struct platform_device *pdev, | |
366 | int chip_index) | |
367 | { | |
368 | struct htcpld_data *htcpld; | |
369 | struct device *dev = &pdev->dev; | |
370 | struct htcpld_core_platform_data *pdata; | |
371 | struct htcpld_chip *chip; | |
372 | struct htcpld_chip_platform_data *plat_chip_data; | |
373 | struct i2c_adapter *adapter; | |
374 | struct i2c_client *client; | |
375 | struct i2c_board_info info; | |
376 | ||
377 | /* Get the platform and driver data */ | |
378 | pdata = dev->platform_data; | |
379 | htcpld = platform_get_drvdata(pdev); | |
380 | chip = &htcpld->chip[chip_index]; | |
381 | plat_chip_data = &pdata->chip[chip_index]; | |
382 | ||
383 | adapter = i2c_get_adapter(pdata->i2c_adapter_id); | |
384 | if (adapter == NULL) { | |
385 | /* Eek, no such I2C adapter! Bail out. */ | |
386 | dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n", | |
387 | plat_chip_data->addr, pdata->i2c_adapter_id); | |
388 | return -ENODEV; | |
389 | } | |
390 | ||
391 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) { | |
392 | dev_warn(dev, "i2c adapter %d non-functional\n", | |
393 | pdata->i2c_adapter_id); | |
394 | return -EINVAL; | |
395 | } | |
396 | ||
397 | memset(&info, 0, sizeof(struct i2c_board_info)); | |
398 | info.addr = plat_chip_data->addr; | |
399 | strlcpy(info.type, "htcpld-chip", I2C_NAME_SIZE); | |
400 | info.platform_data = chip; | |
401 | ||
402 | /* Add the I2C device. This calls the probe() function. */ | |
403 | client = i2c_new_device(adapter, &info); | |
404 | if (!client) { | |
405 | /* I2C device registration failed, contineu with the next */ | |
406 | dev_warn(dev, "Unable to add I2C device for 0x%x\n", | |
407 | plat_chip_data->addr); | |
408 | return -ENODEV; | |
409 | } | |
410 | ||
411 | i2c_set_clientdata(client, chip); | |
412 | snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%d", client->addr); | |
413 | chip->client = client; | |
414 | ||
415 | /* Reset the chip */ | |
416 | htcpld_chip_reset(client); | |
417 | chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out); | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | static void __devinit htcpld_unregister_chip_i2c( | |
423 | struct platform_device *pdev, | |
424 | int chip_index) | |
425 | { | |
426 | struct htcpld_data *htcpld; | |
427 | struct htcpld_chip *chip; | |
428 | ||
429 | /* Get the platform and driver data */ | |
430 | htcpld = platform_get_drvdata(pdev); | |
431 | chip = &htcpld->chip[chip_index]; | |
432 | ||
433 | if (chip->client) | |
434 | i2c_unregister_device(chip->client); | |
435 | } | |
436 | ||
437 | static int __devinit htcpld_register_chip_gpio( | |
438 | struct platform_device *pdev, | |
439 | int chip_index) | |
440 | { | |
441 | struct htcpld_data *htcpld; | |
442 | struct device *dev = &pdev->dev; | |
443 | struct htcpld_core_platform_data *pdata; | |
444 | struct htcpld_chip *chip; | |
445 | struct htcpld_chip_platform_data *plat_chip_data; | |
446 | struct gpio_chip *gpio_chip; | |
447 | int ret = 0; | |
448 | ||
449 | /* Get the platform and driver data */ | |
450 | pdata = dev->platform_data; | |
451 | htcpld = platform_get_drvdata(pdev); | |
452 | chip = &htcpld->chip[chip_index]; | |
453 | plat_chip_data = &pdata->chip[chip_index]; | |
454 | ||
455 | /* Setup the GPIO chips */ | |
456 | gpio_chip = &(chip->chip_out); | |
457 | gpio_chip->label = "htcpld-out"; | |
458 | gpio_chip->dev = dev; | |
459 | gpio_chip->owner = THIS_MODULE; | |
460 | gpio_chip->get = htcpld_chip_get; | |
461 | gpio_chip->set = htcpld_chip_set; | |
462 | gpio_chip->direction_input = NULL; | |
463 | gpio_chip->direction_output = htcpld_direction_output; | |
464 | gpio_chip->base = plat_chip_data->gpio_out_base; | |
465 | gpio_chip->ngpio = plat_chip_data->num_gpios; | |
466 | ||
467 | gpio_chip = &(chip->chip_in); | |
468 | gpio_chip->label = "htcpld-in"; | |
469 | gpio_chip->dev = dev; | |
470 | gpio_chip->owner = THIS_MODULE; | |
471 | gpio_chip->get = htcpld_chip_get; | |
472 | gpio_chip->set = NULL; | |
473 | gpio_chip->direction_input = htcpld_direction_input; | |
474 | gpio_chip->direction_output = NULL; | |
475 | gpio_chip->to_irq = htcpld_chip_to_irq; | |
476 | gpio_chip->base = plat_chip_data->gpio_in_base; | |
477 | gpio_chip->ngpio = plat_chip_data->num_gpios; | |
478 | ||
479 | /* Add the GPIO chips */ | |
480 | ret = gpiochip_add(&(chip->chip_out)); | |
481 | if (ret) { | |
482 | dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n", | |
483 | plat_chip_data->addr, ret); | |
484 | return ret; | |
485 | } | |
486 | ||
487 | ret = gpiochip_add(&(chip->chip_in)); | |
488 | if (ret) { | |
489 | int error; | |
490 | ||
491 | dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n", | |
492 | plat_chip_data->addr, ret); | |
493 | ||
494 | error = gpiochip_remove(&(chip->chip_out)); | |
495 | if (error) | |
496 | dev_warn(dev, "Error while trying to unregister gpio chip: %d\n", error); | |
497 | ||
498 | return ret; | |
499 | } | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
504 | static int __devinit htcpld_setup_chips(struct platform_device *pdev) | |
505 | { | |
506 | struct htcpld_data *htcpld; | |
507 | struct device *dev = &pdev->dev; | |
508 | struct htcpld_core_platform_data *pdata; | |
509 | int i; | |
510 | ||
511 | /* Get the platform and driver data */ | |
512 | pdata = dev->platform_data; | |
513 | htcpld = platform_get_drvdata(pdev); | |
514 | ||
515 | /* Setup each chip's output GPIOs */ | |
516 | htcpld->nchips = pdata->num_chip; | |
517 | htcpld->chip = kzalloc(sizeof(struct htcpld_chip) * htcpld->nchips, | |
518 | GFP_KERNEL); | |
519 | if (!htcpld->chip) { | |
520 | dev_warn(dev, "Unable to allocate memory for chips\n"); | |
521 | return -ENOMEM; | |
522 | } | |
523 | ||
524 | /* Add the chips as best we can */ | |
525 | for (i = 0; i < htcpld->nchips; i++) { | |
526 | int ret; | |
527 | ||
528 | /* Setup the HTCPLD chips */ | |
529 | htcpld->chip[i].reset = pdata->chip[i].reset; | |
530 | htcpld->chip[i].cache_out = pdata->chip[i].reset; | |
531 | htcpld->chip[i].cache_in = 0; | |
532 | htcpld->chip[i].dev = dev; | |
533 | htcpld->chip[i].irq_start = pdata->chip[i].irq_base; | |
534 | htcpld->chip[i].nirqs = pdata->chip[i].num_irqs; | |
535 | ||
536 | INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni); | |
537 | spin_lock_init(&(htcpld->chip[i].lock)); | |
538 | ||
539 | /* Setup the interrupts for the chip */ | |
540 | if (htcpld->chained_irq) { | |
541 | ret = htcpld_setup_chip_irq(pdev, i); | |
542 | if (ret) | |
543 | continue; | |
544 | } | |
545 | ||
546 | /* Register the chip with I2C */ | |
547 | ret = htcpld_register_chip_i2c(pdev, i); | |
548 | if (ret) | |
549 | continue; | |
550 | ||
551 | ||
552 | /* Register the chips with the GPIO subsystem */ | |
553 | ret = htcpld_register_chip_gpio(pdev, i); | |
554 | if (ret) { | |
555 | /* Unregister the chip from i2c and continue */ | |
556 | htcpld_unregister_chip_i2c(pdev, i); | |
557 | continue; | |
558 | } | |
559 | ||
560 | dev_info(dev, "Registered chip at 0x%x\n", pdata->chip[i].addr); | |
561 | } | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | static int __devinit htcpld_core_probe(struct platform_device *pdev) | |
567 | { | |
568 | struct htcpld_data *htcpld; | |
569 | struct device *dev = &pdev->dev; | |
570 | struct htcpld_core_platform_data *pdata; | |
571 | struct resource *res; | |
572 | int ret = 0; | |
573 | ||
574 | if (!dev) | |
575 | return -ENODEV; | |
576 | ||
577 | pdata = dev->platform_data; | |
578 | if (!pdata) { | |
579 | dev_warn(dev, "Platform data not found for htcpld core!\n"); | |
580 | return -ENXIO; | |
581 | } | |
582 | ||
583 | htcpld = kzalloc(sizeof(struct htcpld_data), GFP_KERNEL); | |
584 | if (!htcpld) | |
585 | return -ENOMEM; | |
586 | ||
587 | /* Find chained irq */ | |
588 | ret = -EINVAL; | |
589 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
590 | if (res) { | |
591 | int flags; | |
592 | htcpld->chained_irq = res->start; | |
593 | ||
594 | /* Setup the chained interrupt handler */ | |
595 | flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING; | |
596 | ret = request_threaded_irq(htcpld->chained_irq, | |
597 | NULL, htcpld_handler, | |
598 | flags, pdev->name, htcpld); | |
599 | if (ret) { | |
600 | dev_warn(dev, "Unable to setup chained irq handler: %d\n", ret); | |
601 | goto fail; | |
602 | } else | |
603 | device_init_wakeup(dev, 0); | |
604 | } | |
605 | ||
606 | /* Set the driver data */ | |
607 | platform_set_drvdata(pdev, htcpld); | |
608 | ||
609 | /* Setup the htcpld chips */ | |
610 | ret = htcpld_setup_chips(pdev); | |
611 | if (ret) | |
612 | goto fail; | |
613 | ||
614 | /* Request the GPIO(s) for the int reset and set them up */ | |
615 | if (pdata->int_reset_gpio_hi) { | |
616 | ret = gpio_request(pdata->int_reset_gpio_hi, "htcpld-core"); | |
617 | if (ret) { | |
618 | /* | |
619 | * If it failed, that sucks, but we can probably | |
620 | * continue on without it. | |
621 | */ | |
622 | dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n"); | |
623 | htcpld->int_reset_gpio_hi = 0; | |
624 | } else { | |
625 | htcpld->int_reset_gpio_hi = pdata->int_reset_gpio_hi; | |
626 | gpio_set_value(htcpld->int_reset_gpio_hi, 1); | |
627 | } | |
628 | } | |
629 | ||
630 | if (pdata->int_reset_gpio_lo) { | |
631 | ret = gpio_request(pdata->int_reset_gpio_lo, "htcpld-core"); | |
632 | if (ret) { | |
633 | /* | |
634 | * If it failed, that sucks, but we can probably | |
635 | * continue on without it. | |
636 | */ | |
637 | dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n"); | |
638 | htcpld->int_reset_gpio_lo = 0; | |
639 | } else { | |
640 | htcpld->int_reset_gpio_lo = pdata->int_reset_gpio_lo; | |
641 | gpio_set_value(htcpld->int_reset_gpio_lo, 0); | |
642 | } | |
643 | } | |
644 | ||
645 | dev_info(dev, "Initialized successfully\n"); | |
646 | return 0; | |
647 | ||
648 | fail: | |
649 | kfree(htcpld); | |
650 | return ret; | |
651 | } | |
652 | ||
653 | /* The I2C Driver -- used internally */ | |
654 | static const struct i2c_device_id htcpld_chip_id[] = { | |
655 | { "htcpld-chip", 0 }, | |
656 | { } | |
657 | }; | |
658 | MODULE_DEVICE_TABLE(i2c, htcpld_chip_id); | |
659 | ||
660 | ||
661 | static struct i2c_driver htcpld_chip_driver = { | |
662 | .driver = { | |
663 | .name = "htcpld-chip", | |
664 | }, | |
665 | .id_table = htcpld_chip_id, | |
666 | }; | |
667 | ||
668 | /* The Core Driver */ | |
669 | static struct platform_driver htcpld_core_driver = { | |
670 | .driver = { | |
671 | .name = "i2c-htcpld", | |
672 | }, | |
673 | }; | |
674 | ||
675 | static int __init htcpld_core_init(void) | |
676 | { | |
677 | int ret; | |
678 | ||
679 | /* Register the I2C Chip driver */ | |
680 | ret = i2c_add_driver(&htcpld_chip_driver); | |
681 | if (ret) | |
682 | return ret; | |
683 | ||
684 | /* Probe for our chips */ | |
685 | return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe); | |
686 | } | |
687 | ||
688 | static void __exit htcpld_core_exit(void) | |
689 | { | |
690 | i2c_del_driver(&htcpld_chip_driver); | |
691 | platform_driver_unregister(&htcpld_core_driver); | |
692 | } | |
693 | ||
694 | module_init(htcpld_core_init); | |
695 | module_exit(htcpld_core_exit); | |
696 | ||
697 | MODULE_AUTHOR("Cory Maccarrone <darkstar6262@gmail.com>"); | |
698 | MODULE_DESCRIPTION("I2C HTC PLD Driver"); | |
699 | MODULE_LICENSE("GPL"); | |
700 |