]>
Commit | Line | Data |
---|---|---|
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> | |
38 | ||
39 | struct htcpld_chip { | |
40 | spinlock_t lock; | |
41 | ||
42 | /* chip info */ | |
43 | u8 reset; | |
44 | u8 addr; | |
45 | struct device *dev; | |
46 | struct i2c_client *client; | |
47 | ||
48 | /* Output details */ | |
49 | u8 cache_out; | |
50 | struct gpio_chip chip_out; | |
51 | ||
52 | /* Input details */ | |
53 | u8 cache_in; | |
54 | struct gpio_chip chip_in; | |
55 | ||
56 | u16 irqs_enabled; | |
57 | uint irq_start; | |
58 | int nirqs; | |
59 | ||
60 | /* | |
61 | * Work structure to allow for setting values outside of any | |
62 | * possible interrupt context | |
63 | */ | |
64 | struct work_struct set_val_work; | |
65 | }; | |
66 | ||
67 | struct htcpld_data { | |
68 | /* irq info */ | |
69 | u16 irqs_enabled; | |
70 | uint irq_start; | |
71 | int nirqs; | |
72 | uint chained_irq; | |
73 | unsigned int int_reset_gpio_hi; | |
74 | unsigned int int_reset_gpio_lo; | |
75 | ||
76 | /* htcpld info */ | |
77 | struct htcpld_chip *chip; | |
78 | unsigned int nchips; | |
79 | }; | |
80 | ||
81 | /* There does not appear to be a way to proactively mask interrupts | |
82 | * on the htcpld chip itself. So, we simply ignore interrupts that | |
83 | * aren't desired. */ | |
84 | static void htcpld_mask(unsigned int irq) | |
85 | { | |
86 | struct htcpld_chip *chip = get_irq_chip_data(irq); | |
87 | chip->irqs_enabled &= ~(1 << (irq - chip->irq_start)); | |
88 | pr_debug("HTCPLD mask %d %04x\n", irq, chip->irqs_enabled); | |
89 | } | |
90 | static void htcpld_unmask(unsigned int irq) | |
91 | { | |
92 | struct htcpld_chip *chip = get_irq_chip_data(irq); | |
93 | chip->irqs_enabled |= 1 << (irq - chip->irq_start); | |
94 | pr_debug("HTCPLD unmask %d %04x\n", irq, chip->irqs_enabled); | |
95 | } | |
96 | ||
97 | static int htcpld_set_type(unsigned int irq, unsigned int flags) | |
98 | { | |
99 | struct irq_desc *d = irq_to_desc(irq); | |
100 | ||
101 | if (!d) { | |
102 | pr_err("HTCPLD invalid IRQ: %d\n", irq); | |
103 | return -EINVAL; | |
104 | } | |
105 | ||
106 | if (flags & ~IRQ_TYPE_SENSE_MASK) | |
107 | return -EINVAL; | |
108 | ||
109 | /* We only allow edge triggering */ | |
110 | if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)) | |
111 | return -EINVAL; | |
112 | ||
113 | d->status &= ~IRQ_TYPE_SENSE_MASK; | |
114 | d->status |= flags; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | static struct irq_chip htcpld_muxed_chip = { | |
120 | .name = "htcpld", | |
121 | .mask = htcpld_mask, | |
122 | .unmask = htcpld_unmask, | |
123 | .set_type = htcpld_set_type, | |
124 | }; | |
125 | ||
126 | /* To properly dispatch IRQ events, we need to read from the | |
127 | * chip. This is an I2C action that could possibly sleep | |
128 | * (which is bad in interrupt context) -- so we use a threaded | |
129 | * interrupt handler to get around that. | |
130 | */ | |
131 | static irqreturn_t htcpld_handler(int irq, void *dev) | |
132 | { | |
133 | struct htcpld_data *htcpld = dev; | |
134 | unsigned int i; | |
135 | unsigned long flags; | |
136 | int irqpin; | |
137 | struct irq_desc *desc; | |
138 | ||
139 | if (!htcpld) { | |
140 | pr_debug("htcpld is null in ISR\n"); | |
141 | return IRQ_HANDLED; | |
142 | } | |
143 | ||
144 | /* | |
145 | * For each chip, do a read of the chip and trigger any interrupts | |
146 | * desired. The interrupts will be triggered from LSB to MSB (i.e. | |
147 | * bit 0 first, then bit 1, etc.) | |
148 | * | |
149 | * For chips that have no interrupt range specified, just skip 'em. | |
150 | */ | |
151 | for (i = 0; i < htcpld->nchips; i++) { | |
152 | struct htcpld_chip *chip = &htcpld->chip[i]; | |
153 | struct i2c_client *client; | |
154 | int val; | |
155 | unsigned long uval, old_val; | |
156 | ||
157 | if (!chip) { | |
158 | pr_debug("chip %d is null in ISR\n", i); | |
159 | continue; | |
160 | } | |
161 | ||
162 | if (chip->nirqs == 0) | |
163 | continue; | |
164 | ||
165 | client = chip->client; | |
166 | if (!client) { | |
167 | pr_debug("client %d is null in ISR\n", i); | |
168 | continue; | |
169 | } | |
170 | ||
171 | /* Scan the chip */ | |
172 | val = i2c_smbus_read_byte_data(client, chip->cache_out); | |
173 | if (val < 0) { | |
174 | /* Throw a warning and skip this chip */ | |
175 | dev_warn(chip->dev, "Unable to read from chip: %d\n", | |
176 | val); | |
177 | continue; | |
178 | } | |
179 | ||
180 | uval = (unsigned long)val; | |
181 | ||
182 | spin_lock_irqsave(&chip->lock, flags); | |
183 | ||
184 | /* Save away the old value so we can compare it */ | |
185 | old_val = chip->cache_in; | |
186 | ||
187 | /* Write the new value */ | |
188 | chip->cache_in = uval; | |
189 | ||
190 | spin_unlock_irqrestore(&chip->lock, flags); | |
191 | ||
192 | /* | |
193 | * For each bit in the data (starting at bit 0), trigger | |
194 | * associated interrupts. | |
195 | */ | |
196 | for (irqpin = 0; irqpin < chip->nirqs; irqpin++) { | |
197 | unsigned oldb, newb; | |
198 | int flags; | |
199 | ||
200 | irq = chip->irq_start + irqpin; | |
201 | desc = irq_to_desc(irq); | |
202 | flags = desc->status; | |
203 | ||
204 | /* Run the IRQ handler, but only if the bit value | |
205 | * changed, and the proper flags are set */ | |
206 | oldb = (old_val >> irqpin) & 1; | |
207 | newb = (uval >> irqpin) & 1; | |
208 | ||
209 | if ((!oldb && newb && (flags & IRQ_TYPE_EDGE_RISING)) || | |
210 | (oldb && !newb && | |
211 | (flags & IRQ_TYPE_EDGE_FALLING))) { | |
212 | pr_debug("fire IRQ %d\n", irqpin); | |
213 | desc->handle_irq(irq, desc); | |
214 | } | |
215 | } | |
216 | } | |
217 | ||
218 | /* | |
219 | * In order to continue receiving interrupts, the int_reset_gpio must | |
220 | * be asserted. | |
221 | */ | |
222 | if (htcpld->int_reset_gpio_hi) | |
223 | gpio_set_value(htcpld->int_reset_gpio_hi, 1); | |
224 | if (htcpld->int_reset_gpio_lo) | |
225 | gpio_set_value(htcpld->int_reset_gpio_lo, 0); | |
226 | ||
227 | return IRQ_HANDLED; | |
228 | } | |
229 | ||
230 | /* | |
231 | * The GPIO set routines can be called from interrupt context, especially if, | |
232 | * for example they're attached to the led-gpio framework and a trigger is | |
233 | * enabled. As such, we declared work above in the htcpld_chip structure, | |
234 | * and that work is scheduled in the set routine. The kernel can then run | |
235 | * the I2C functions, which will sleep, in process context. | |
236 | */ | |
237 | void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val) | |
238 | { | |
239 | struct i2c_client *client; | |
240 | struct htcpld_chip *chip_data; | |
241 | unsigned long flags; | |
242 | ||
243 | chip_data = container_of(chip, struct htcpld_chip, chip_out); | |
244 | if (!chip_data) | |
245 | return; | |
246 | ||
247 | client = chip_data->client; | |
248 | if (client == NULL) | |
249 | return; | |
250 | ||
251 | spin_lock_irqsave(&chip_data->lock, flags); | |
252 | if (val) | |
253 | chip_data->cache_out |= (1 << offset); | |
254 | else | |
255 | chip_data->cache_out &= ~(1 << offset); | |
256 | spin_unlock_irqrestore(&chip_data->lock, flags); | |
257 | ||
258 | schedule_work(&(chip_data->set_val_work)); | |
259 | } | |
260 | ||
261 | void htcpld_chip_set_ni(struct work_struct *work) | |
262 | { | |
263 | struct htcpld_chip *chip_data; | |
264 | struct i2c_client *client; | |
265 | ||
266 | chip_data = container_of(work, struct htcpld_chip, set_val_work); | |
267 | client = chip_data->client; | |
268 | i2c_smbus_read_byte_data(client, chip_data->cache_out); | |
269 | } | |
270 | ||
271 | int htcpld_chip_get(struct gpio_chip *chip, unsigned offset) | |
272 | { | |
273 | struct htcpld_chip *chip_data; | |
274 | int val = 0; | |
275 | int is_input = 0; | |
276 | ||
277 | /* Try out first */ | |
278 | chip_data = container_of(chip, struct htcpld_chip, chip_out); | |
279 | if (!chip_data) { | |
280 | /* Try in */ | |
281 | is_input = 1; | |
282 | chip_data = container_of(chip, struct htcpld_chip, chip_in); | |
283 | if (!chip_data) | |
284 | return -EINVAL; | |
285 | } | |
286 | ||
287 | /* Determine if this is an input or output GPIO */ | |
288 | if (!is_input) | |
289 | /* Use the output cache */ | |
290 | val = (chip_data->cache_out >> offset) & 1; | |
291 | else | |
292 | /* Use the input cache */ | |
293 | val = (chip_data->cache_in >> offset) & 1; | |
294 | ||
295 | if (val) | |
296 | return 1; | |
297 | else | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static int htcpld_direction_output(struct gpio_chip *chip, | |
302 | unsigned offset, int value) | |
303 | { | |
304 | htcpld_chip_set(chip, offset, value); | |
305 | return 0; | |
306 | } | |
307 | ||
308 | static int htcpld_direction_input(struct gpio_chip *chip, | |
309 | unsigned offset) | |
310 | { | |
311 | /* | |
312 | * No-op: this function can only be called on the input chip. | |
313 | * We do however make sure the offset is within range. | |
314 | */ | |
315 | return (offset < chip->ngpio) ? 0 : -EINVAL; | |
316 | } | |
317 | ||
318 | int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset) | |
319 | { | |
320 | struct htcpld_chip *chip_data; | |
321 | ||
322 | chip_data = container_of(chip, struct htcpld_chip, chip_in); | |
323 | ||
324 | if (offset < chip_data->nirqs) | |
325 | return chip_data->irq_start + offset; | |
326 | else | |
327 | return -EINVAL; | |
328 | } | |
329 | ||
330 | void htcpld_chip_reset(struct i2c_client *client) | |
331 | { | |
332 | struct htcpld_chip *chip_data = i2c_get_clientdata(client); | |
333 | if (!chip_data) | |
334 | return; | |
335 | ||
336 | i2c_smbus_read_byte_data( | |
337 | client, (chip_data->cache_out = chip_data->reset)); | |
338 | } | |
339 | ||
340 | static int __devinit htcpld_setup_chip_irq( | |
341 | struct platform_device *pdev, | |
342 | int chip_index) | |
343 | { | |
344 | struct htcpld_data *htcpld; | |
345 | struct device *dev = &pdev->dev; | |
346 | struct htcpld_core_platform_data *pdata; | |
347 | struct htcpld_chip *chip; | |
348 | struct htcpld_chip_platform_data *plat_chip_data; | |
349 | unsigned int irq, irq_end; | |
350 | int ret = 0; | |
351 | ||
352 | /* Get the platform and driver data */ | |
353 | pdata = dev->platform_data; | |
354 | htcpld = platform_get_drvdata(pdev); | |
355 | chip = &htcpld->chip[chip_index]; | |
356 | plat_chip_data = &pdata->chip[chip_index]; | |
357 | ||
358 | /* Setup irq handlers */ | |
359 | irq_end = chip->irq_start + chip->nirqs; | |
360 | for (irq = chip->irq_start; irq < irq_end; irq++) { | |
361 | set_irq_chip(irq, &htcpld_muxed_chip); | |
362 | set_irq_chip_data(irq, chip); | |
363 | set_irq_handler(irq, handle_simple_irq); | |
364 | #ifdef CONFIG_ARM | |
365 | set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); | |
366 | #else | |
367 | set_irq_probe(irq); | |
368 | #endif | |
369 | } | |
370 | ||
371 | return ret; | |
372 | } | |
373 | ||
374 | static int __devinit htcpld_register_chip_i2c( | |
375 | struct platform_device *pdev, | |
376 | int chip_index) | |
377 | { | |
378 | struct htcpld_data *htcpld; | |
379 | struct device *dev = &pdev->dev; | |
380 | struct htcpld_core_platform_data *pdata; | |
381 | struct htcpld_chip *chip; | |
382 | struct htcpld_chip_platform_data *plat_chip_data; | |
383 | struct i2c_adapter *adapter; | |
384 | struct i2c_client *client; | |
385 | struct i2c_board_info info; | |
386 | ||
387 | /* Get the platform and driver data */ | |
388 | pdata = dev->platform_data; | |
389 | htcpld = platform_get_drvdata(pdev); | |
390 | chip = &htcpld->chip[chip_index]; | |
391 | plat_chip_data = &pdata->chip[chip_index]; | |
392 | ||
393 | adapter = i2c_get_adapter(pdata->i2c_adapter_id); | |
394 | if (adapter == NULL) { | |
395 | /* Eek, no such I2C adapter! Bail out. */ | |
396 | dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n", | |
397 | plat_chip_data->addr, pdata->i2c_adapter_id); | |
398 | return -ENODEV; | |
399 | } | |
400 | ||
401 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) { | |
402 | dev_warn(dev, "i2c adapter %d non-functional\n", | |
403 | pdata->i2c_adapter_id); | |
404 | return -EINVAL; | |
405 | } | |
406 | ||
407 | memset(&info, 0, sizeof(struct i2c_board_info)); | |
408 | info.addr = plat_chip_data->addr; | |
409 | strlcpy(info.type, "htcpld-chip", I2C_NAME_SIZE); | |
410 | info.platform_data = chip; | |
411 | ||
412 | /* Add the I2C device. This calls the probe() function. */ | |
413 | client = i2c_new_device(adapter, &info); | |
414 | if (!client) { | |
415 | /* I2C device registration failed, contineu with the next */ | |
416 | dev_warn(dev, "Unable to add I2C device for 0x%x\n", | |
417 | plat_chip_data->addr); | |
418 | return -ENODEV; | |
419 | } | |
420 | ||
421 | i2c_set_clientdata(client, chip); | |
422 | snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%d", client->addr); | |
423 | chip->client = client; | |
424 | ||
425 | /* Reset the chip */ | |
426 | htcpld_chip_reset(client); | |
427 | chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out); | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | static void __devinit htcpld_unregister_chip_i2c( | |
433 | struct platform_device *pdev, | |
434 | int chip_index) | |
435 | { | |
436 | struct htcpld_data *htcpld; | |
437 | struct htcpld_chip *chip; | |
438 | ||
439 | /* Get the platform and driver data */ | |
440 | htcpld = platform_get_drvdata(pdev); | |
441 | chip = &htcpld->chip[chip_index]; | |
442 | ||
443 | if (chip->client) | |
444 | i2c_unregister_device(chip->client); | |
445 | } | |
446 | ||
447 | static int __devinit htcpld_register_chip_gpio( | |
448 | struct platform_device *pdev, | |
449 | int chip_index) | |
450 | { | |
451 | struct htcpld_data *htcpld; | |
452 | struct device *dev = &pdev->dev; | |
453 | struct htcpld_core_platform_data *pdata; | |
454 | struct htcpld_chip *chip; | |
455 | struct htcpld_chip_platform_data *plat_chip_data; | |
456 | struct gpio_chip *gpio_chip; | |
457 | int ret = 0; | |
458 | ||
459 | /* Get the platform and driver data */ | |
460 | pdata = dev->platform_data; | |
461 | htcpld = platform_get_drvdata(pdev); | |
462 | chip = &htcpld->chip[chip_index]; | |
463 | plat_chip_data = &pdata->chip[chip_index]; | |
464 | ||
465 | /* Setup the GPIO chips */ | |
466 | gpio_chip = &(chip->chip_out); | |
467 | gpio_chip->label = "htcpld-out"; | |
468 | gpio_chip->dev = dev; | |
469 | gpio_chip->owner = THIS_MODULE; | |
470 | gpio_chip->get = htcpld_chip_get; | |
471 | gpio_chip->set = htcpld_chip_set; | |
472 | gpio_chip->direction_input = NULL; | |
473 | gpio_chip->direction_output = htcpld_direction_output; | |
474 | gpio_chip->base = plat_chip_data->gpio_out_base; | |
475 | gpio_chip->ngpio = plat_chip_data->num_gpios; | |
476 | ||
477 | gpio_chip = &(chip->chip_in); | |
478 | gpio_chip->label = "htcpld-in"; | |
479 | gpio_chip->dev = dev; | |
480 | gpio_chip->owner = THIS_MODULE; | |
481 | gpio_chip->get = htcpld_chip_get; | |
482 | gpio_chip->set = NULL; | |
483 | gpio_chip->direction_input = htcpld_direction_input; | |
484 | gpio_chip->direction_output = NULL; | |
485 | gpio_chip->to_irq = htcpld_chip_to_irq; | |
486 | gpio_chip->base = plat_chip_data->gpio_in_base; | |
487 | gpio_chip->ngpio = plat_chip_data->num_gpios; | |
488 | ||
489 | /* Add the GPIO chips */ | |
490 | ret = gpiochip_add(&(chip->chip_out)); | |
491 | if (ret) { | |
492 | dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n", | |
493 | plat_chip_data->addr, ret); | |
494 | return ret; | |
495 | } | |
496 | ||
497 | ret = gpiochip_add(&(chip->chip_in)); | |
498 | if (ret) { | |
499 | int error; | |
500 | ||
501 | dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n", | |
502 | plat_chip_data->addr, ret); | |
503 | ||
504 | error = gpiochip_remove(&(chip->chip_out)); | |
505 | if (error) | |
506 | dev_warn(dev, "Error while trying to unregister gpio chip: %d\n", error); | |
507 | ||
508 | return ret; | |
509 | } | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | static int __devinit htcpld_setup_chips(struct platform_device *pdev) | |
515 | { | |
516 | struct htcpld_data *htcpld; | |
517 | struct device *dev = &pdev->dev; | |
518 | struct htcpld_core_platform_data *pdata; | |
519 | int i; | |
520 | ||
521 | /* Get the platform and driver data */ | |
522 | pdata = dev->platform_data; | |
523 | htcpld = platform_get_drvdata(pdev); | |
524 | ||
525 | /* Setup each chip's output GPIOs */ | |
526 | htcpld->nchips = pdata->num_chip; | |
527 | htcpld->chip = kzalloc(sizeof(struct htcpld_chip) * htcpld->nchips, | |
528 | GFP_KERNEL); | |
529 | if (!htcpld->chip) { | |
530 | dev_warn(dev, "Unable to allocate memory for chips\n"); | |
531 | return -ENOMEM; | |
532 | } | |
533 | ||
534 | /* Add the chips as best we can */ | |
535 | for (i = 0; i < htcpld->nchips; i++) { | |
536 | int ret; | |
537 | ||
538 | /* Setup the HTCPLD chips */ | |
539 | htcpld->chip[i].reset = pdata->chip[i].reset; | |
540 | htcpld->chip[i].cache_out = pdata->chip[i].reset; | |
541 | htcpld->chip[i].cache_in = 0; | |
542 | htcpld->chip[i].dev = dev; | |
543 | htcpld->chip[i].irq_start = pdata->chip[i].irq_base; | |
544 | htcpld->chip[i].nirqs = pdata->chip[i].num_irqs; | |
545 | ||
546 | INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni); | |
547 | spin_lock_init(&(htcpld->chip[i].lock)); | |
548 | ||
549 | /* Setup the interrupts for the chip */ | |
550 | if (htcpld->chained_irq) { | |
551 | ret = htcpld_setup_chip_irq(pdev, i); | |
552 | if (ret) | |
553 | continue; | |
554 | } | |
555 | ||
556 | /* Register the chip with I2C */ | |
557 | ret = htcpld_register_chip_i2c(pdev, i); | |
558 | if (ret) | |
559 | continue; | |
560 | ||
561 | ||
562 | /* Register the chips with the GPIO subsystem */ | |
563 | ret = htcpld_register_chip_gpio(pdev, i); | |
564 | if (ret) { | |
565 | /* Unregister the chip from i2c and continue */ | |
566 | htcpld_unregister_chip_i2c(pdev, i); | |
567 | continue; | |
568 | } | |
569 | ||
570 | dev_info(dev, "Registered chip at 0x%x\n", pdata->chip[i].addr); | |
571 | } | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | static int __devinit htcpld_core_probe(struct platform_device *pdev) | |
577 | { | |
578 | struct htcpld_data *htcpld; | |
579 | struct device *dev = &pdev->dev; | |
580 | struct htcpld_core_platform_data *pdata; | |
581 | struct resource *res; | |
582 | int ret = 0; | |
583 | ||
584 | if (!dev) | |
585 | return -ENODEV; | |
586 | ||
587 | pdata = dev->platform_data; | |
588 | if (!pdata) { | |
589 | dev_warn(dev, "Platform data not found for htcpld core!\n"); | |
590 | return -ENXIO; | |
591 | } | |
592 | ||
593 | htcpld = kzalloc(sizeof(struct htcpld_data), GFP_KERNEL); | |
594 | if (!htcpld) | |
595 | return -ENOMEM; | |
596 | ||
597 | /* Find chained irq */ | |
598 | ret = -EINVAL; | |
599 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
600 | if (res) { | |
601 | int flags; | |
602 | htcpld->chained_irq = res->start; | |
603 | ||
604 | /* Setup the chained interrupt handler */ | |
605 | flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING; | |
606 | ret = request_threaded_irq(htcpld->chained_irq, | |
607 | NULL, htcpld_handler, | |
608 | flags, pdev->name, htcpld); | |
609 | if (ret) { | |
610 | dev_warn(dev, "Unable to setup chained irq handler: %d\n", ret); | |
611 | goto fail; | |
612 | } else | |
613 | device_init_wakeup(dev, 0); | |
614 | } | |
615 | ||
616 | /* Set the driver data */ | |
617 | platform_set_drvdata(pdev, htcpld); | |
618 | ||
619 | /* Setup the htcpld chips */ | |
620 | ret = htcpld_setup_chips(pdev); | |
621 | if (ret) | |
622 | goto fail; | |
623 | ||
624 | /* Request the GPIO(s) for the int reset and set them up */ | |
625 | if (pdata->int_reset_gpio_hi) { | |
626 | ret = gpio_request(pdata->int_reset_gpio_hi, "htcpld-core"); | |
627 | if (ret) { | |
628 | /* | |
629 | * If it failed, that sucks, but we can probably | |
630 | * continue on without it. | |
631 | */ | |
632 | dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n"); | |
633 | htcpld->int_reset_gpio_hi = 0; | |
634 | } else { | |
635 | htcpld->int_reset_gpio_hi = pdata->int_reset_gpio_hi; | |
636 | gpio_set_value(htcpld->int_reset_gpio_hi, 1); | |
637 | } | |
638 | } | |
639 | ||
640 | if (pdata->int_reset_gpio_lo) { | |
641 | ret = gpio_request(pdata->int_reset_gpio_lo, "htcpld-core"); | |
642 | if (ret) { | |
643 | /* | |
644 | * If it failed, that sucks, but we can probably | |
645 | * continue on without it. | |
646 | */ | |
647 | dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n"); | |
648 | htcpld->int_reset_gpio_lo = 0; | |
649 | } else { | |
650 | htcpld->int_reset_gpio_lo = pdata->int_reset_gpio_lo; | |
651 | gpio_set_value(htcpld->int_reset_gpio_lo, 0); | |
652 | } | |
653 | } | |
654 | ||
655 | dev_info(dev, "Initialized successfully\n"); | |
656 | return 0; | |
657 | ||
658 | fail: | |
659 | kfree(htcpld); | |
660 | return ret; | |
661 | } | |
662 | ||
663 | /* The I2C Driver -- used internally */ | |
664 | static const struct i2c_device_id htcpld_chip_id[] = { | |
665 | { "htcpld-chip", 0 }, | |
666 | { } | |
667 | }; | |
668 | MODULE_DEVICE_TABLE(i2c, htcpld_chip_id); | |
669 | ||
670 | ||
671 | static struct i2c_driver htcpld_chip_driver = { | |
672 | .driver = { | |
673 | .name = "htcpld-chip", | |
674 | }, | |
675 | .id_table = htcpld_chip_id, | |
676 | }; | |
677 | ||
678 | /* The Core Driver */ | |
679 | static struct platform_driver htcpld_core_driver = { | |
680 | .driver = { | |
681 | .name = "i2c-htcpld", | |
682 | }, | |
683 | }; | |
684 | ||
685 | static int __init htcpld_core_init(void) | |
686 | { | |
687 | int ret; | |
688 | ||
689 | /* Register the I2C Chip driver */ | |
690 | ret = i2c_add_driver(&htcpld_chip_driver); | |
691 | if (ret) | |
692 | return ret; | |
693 | ||
694 | /* Probe for our chips */ | |
695 | return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe); | |
696 | } | |
697 | ||
698 | static void __exit htcpld_core_exit(void) | |
699 | { | |
700 | i2c_del_driver(&htcpld_chip_driver); | |
701 | platform_driver_unregister(&htcpld_core_driver); | |
702 | } | |
703 | ||
704 | module_init(htcpld_core_init); | |
705 | module_exit(htcpld_core_exit); | |
706 | ||
707 | MODULE_AUTHOR("Cory Maccarrone <darkstar6262@gmail.com>"); | |
708 | MODULE_DESCRIPTION("I2C HTC PLD Driver"); | |
709 | MODULE_LICENSE("GPL"); | |
710 |