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/interrupt.h> |
31 | #include <linux/platform_device.h> |
32 | #include <linux/i2c.h> |
33 | #include <linux/irq.h> |
34 | #include <linux/spinlock.h> |
35 | #include <linux/htcpld.h> |
36 | #include <linux/gpio.h> |
37 | #include <linux/slab.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 | unsigned int flow_type; |
61 | /* |
62 | * Work structure to allow for setting values outside of any |
63 | * possible interrupt context |
64 | */ |
65 | struct work_struct set_val_work; |
66 | }; |
67 | |
68 | struct htcpld_data { |
69 | /* irq info */ |
70 | u16 irqs_enabled; |
71 | uint irq_start; |
72 | int nirqs; |
73 | uint chained_irq; |
74 | unsigned int int_reset_gpio_hi; |
75 | unsigned int int_reset_gpio_lo; |
76 | |
77 | /* htcpld info */ |
78 | struct htcpld_chip *chip; |
79 | unsigned int nchips; |
80 | }; |
81 | |
82 | /* There does not appear to be a way to proactively mask interrupts |
83 | * on the htcpld chip itself. So, we simply ignore interrupts that |
84 | * aren't desired. */ |
85 | static void htcpld_mask(struct irq_data *data) |
86 | { |
87 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
88 | chip->irqs_enabled &= ~(1 << (data->irq - chip->irq_start)); |
89 | pr_debug("HTCPLD mask %d %04x\n" , data->irq, chip->irqs_enabled); |
90 | } |
91 | static void htcpld_unmask(struct irq_data *data) |
92 | { |
93 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
94 | chip->irqs_enabled |= 1 << (data->irq - chip->irq_start); |
95 | pr_debug("HTCPLD unmask %d %04x\n" , data->irq, chip->irqs_enabled); |
96 | } |
97 | |
98 | static int htcpld_set_type(struct irq_data *data, unsigned int flags) |
99 | { |
100 | struct htcpld_chip *chip = irq_data_get_irq_chip_data(data); |
101 | |
102 | if (flags & ~IRQ_TYPE_SENSE_MASK) |
103 | return -EINVAL; |
104 | |
105 | /* We only allow edge triggering */ |
106 | if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)) |
107 | return -EINVAL; |
108 | |
109 | chip->flow_type = flags; |
110 | return 0; |
111 | } |
112 | |
113 | static struct irq_chip htcpld_muxed_chip = { |
114 | .name = "htcpld" , |
115 | .irq_mask = htcpld_mask, |
116 | .irq_unmask = htcpld_unmask, |
117 | .irq_set_type = htcpld_set_type, |
118 | }; |
119 | |
120 | /* To properly dispatch IRQ events, we need to read from the |
121 | * chip. This is an I2C action that could possibly sleep |
122 | * (which is bad in interrupt context) -- so we use a threaded |
123 | * interrupt handler to get around that. |
124 | */ |
125 | static irqreturn_t htcpld_handler(int irq, void *dev) |
126 | { |
127 | struct htcpld_data *htcpld = dev; |
128 | unsigned int i; |
129 | unsigned long flags; |
130 | int irqpin; |
131 | |
132 | if (!htcpld) { |
133 | pr_debug("htcpld is null in ISR\n" ); |
134 | return IRQ_HANDLED; |
135 | } |
136 | |
137 | /* |
138 | * For each chip, do a read of the chip and trigger any interrupts |
139 | * desired. The interrupts will be triggered from LSB to MSB (i.e. |
140 | * bit 0 first, then bit 1, etc.) |
141 | * |
142 | * For chips that have no interrupt range specified, just skip 'em. |
143 | */ |
144 | for (i = 0; i < htcpld->nchips; i++) { |
145 | struct htcpld_chip *chip = &htcpld->chip[i]; |
146 | struct i2c_client *client; |
147 | int val; |
148 | unsigned long uval, old_val; |
149 | |
150 | if (!chip) { |
151 | pr_debug("chip %d is null in ISR\n" , i); |
152 | continue; |
153 | } |
154 | |
155 | if (chip->nirqs == 0) |
156 | continue; |
157 | |
158 | client = chip->client; |
159 | if (!client) { |
160 | pr_debug("client %d is null in ISR\n" , i); |
161 | continue; |
162 | } |
163 | |
164 | /* Scan the chip */ |
165 | val = i2c_smbus_read_byte_data(client, chip->cache_out); |
166 | if (val < 0) { |
167 | /* Throw a warning and skip this chip */ |
168 | dev_warn(chip->dev, "Unable to read from chip: %d\n" , |
169 | val); |
170 | continue; |
171 | } |
172 | |
173 | uval = (unsigned long)val; |
174 | |
175 | spin_lock_irqsave(&chip->lock, flags); |
176 | |
177 | /* Save away the old value so we can compare it */ |
178 | old_val = chip->cache_in; |
179 | |
180 | /* Write the new value */ |
181 | chip->cache_in = uval; |
182 | |
183 | spin_unlock_irqrestore(&chip->lock, flags); |
184 | |
185 | /* |
186 | * For each bit in the data (starting at bit 0), trigger |
187 | * associated interrupts. |
188 | */ |
189 | for (irqpin = 0; irqpin < chip->nirqs; irqpin++) { |
190 | unsigned oldb, newb, type = chip->flow_type; |
191 | |
192 | irq = chip->irq_start + irqpin; |
193 | |
194 | /* Run the IRQ handler, but only if the bit value |
195 | * changed, and the proper flags are set */ |
196 | oldb = (old_val >> irqpin) & 1; |
197 | newb = (uval >> irqpin) & 1; |
198 | |
199 | if ((!oldb && newb && (type & IRQ_TYPE_EDGE_RISING)) || |
200 | (oldb && !newb && (type & IRQ_TYPE_EDGE_FALLING))) { |
201 | pr_debug("fire IRQ %d\n" , irqpin); |
202 | generic_handle_irq(irq); |
203 | } |
204 | } |
205 | } |
206 | |
207 | /* |
208 | * In order to continue receiving interrupts, the int_reset_gpio must |
209 | * be asserted. |
210 | */ |
211 | if (htcpld->int_reset_gpio_hi) |
212 | gpio_set_value(htcpld->int_reset_gpio_hi, 1); |
213 | if (htcpld->int_reset_gpio_lo) |
214 | gpio_set_value(htcpld->int_reset_gpio_lo, 0); |
215 | |
216 | return IRQ_HANDLED; |
217 | } |
218 | |
219 | /* |
220 | * The GPIO set routines can be called from interrupt context, especially if, |
221 | * for example they're attached to the led-gpio framework and a trigger is |
222 | * enabled. As such, we declared work above in the htcpld_chip structure, |
223 | * and that work is scheduled in the set routine. The kernel can then run |
224 | * the I2C functions, which will sleep, in process context. |
225 | */ |
226 | static void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val) |
227 | { |
228 | struct i2c_client *client; |
229 | struct htcpld_chip *chip_data = gpiochip_get_data(chip); |
230 | unsigned long flags; |
231 | |
232 | client = chip_data->client; |
233 | if (!client) |
234 | return; |
235 | |
236 | spin_lock_irqsave(&chip_data->lock, flags); |
237 | if (val) |
238 | chip_data->cache_out |= (1 << offset); |
239 | else |
240 | chip_data->cache_out &= ~(1 << offset); |
241 | spin_unlock_irqrestore(&chip_data->lock, flags); |
242 | |
243 | schedule_work(&(chip_data->set_val_work)); |
244 | } |
245 | |
246 | static void htcpld_chip_set_ni(struct work_struct *work) |
247 | { |
248 | struct htcpld_chip *chip_data; |
249 | struct i2c_client *client; |
250 | |
251 | chip_data = container_of(work, struct htcpld_chip, set_val_work); |
252 | client = chip_data->client; |
253 | i2c_smbus_read_byte_data(client, chip_data->cache_out); |
254 | } |
255 | |
256 | static int htcpld_chip_get(struct gpio_chip *chip, unsigned offset) |
257 | { |
258 | struct htcpld_chip *chip_data = gpiochip_get_data(chip); |
259 | u8 cache; |
260 | |
261 | if (!strncmp(chip->label, "htcpld-out" , 10)) { |
262 | cache = chip_data->cache_out; |
263 | } else if (!strncmp(chip->label, "htcpld-in" , 9)) { |
264 | cache = chip_data->cache_in; |
265 | } else |
266 | return -EINVAL; |
267 | |
268 | return (cache >> offset) & 1; |
269 | } |
270 | |
271 | static int htcpld_direction_output(struct gpio_chip *chip, |
272 | unsigned offset, int value) |
273 | { |
274 | htcpld_chip_set(chip, offset, value); |
275 | return 0; |
276 | } |
277 | |
278 | static int htcpld_direction_input(struct gpio_chip *chip, |
279 | unsigned offset) |
280 | { |
281 | /* |
282 | * No-op: this function can only be called on the input chip. |
283 | * We do however make sure the offset is within range. |
284 | */ |
285 | return (offset < chip->ngpio) ? 0 : -EINVAL; |
286 | } |
287 | |
288 | static int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset) |
289 | { |
290 | struct htcpld_chip *chip_data = gpiochip_get_data(chip); |
291 | |
292 | if (offset < chip_data->nirqs) |
293 | return chip_data->irq_start + offset; |
294 | else |
295 | return -EINVAL; |
296 | } |
297 | |
298 | static void htcpld_chip_reset(struct i2c_client *client) |
299 | { |
300 | struct htcpld_chip *chip_data = i2c_get_clientdata(client); |
301 | if (!chip_data) |
302 | return; |
303 | |
304 | i2c_smbus_read_byte_data( |
305 | client, (chip_data->cache_out = chip_data->reset)); |
306 | } |
307 | |
308 | static int htcpld_setup_chip_irq( |
309 | struct platform_device *pdev, |
310 | int chip_index) |
311 | { |
312 | struct htcpld_data *htcpld; |
313 | struct htcpld_chip *chip; |
314 | unsigned int irq, irq_end; |
315 | |
316 | /* Get the platform and driver data */ |
317 | htcpld = platform_get_drvdata(pdev); |
318 | chip = &htcpld->chip[chip_index]; |
319 | |
320 | /* Setup irq handlers */ |
321 | irq_end = chip->irq_start + chip->nirqs; |
322 | for (irq = chip->irq_start; irq < irq_end; irq++) { |
323 | irq_set_chip_and_handler(irq, &htcpld_muxed_chip, |
324 | handle_simple_irq); |
325 | irq_set_chip_data(irq, chip); |
326 | irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); |
327 | } |
328 | |
329 | return 0; |
330 | } |
331 | |
332 | static int htcpld_register_chip_i2c( |
333 | struct platform_device *pdev, |
334 | int chip_index) |
335 | { |
336 | struct htcpld_data *htcpld; |
337 | struct device *dev = &pdev->dev; |
338 | struct htcpld_core_platform_data *pdata; |
339 | struct htcpld_chip *chip; |
340 | struct htcpld_chip_platform_data *plat_chip_data; |
341 | struct i2c_adapter *adapter; |
342 | struct i2c_client *client; |
343 | struct i2c_board_info info; |
344 | |
345 | /* Get the platform and driver data */ |
346 | pdata = dev_get_platdata(dev); |
347 | htcpld = platform_get_drvdata(pdev); |
348 | chip = &htcpld->chip[chip_index]; |
349 | plat_chip_data = &pdata->chip[chip_index]; |
350 | |
351 | adapter = i2c_get_adapter(pdata->i2c_adapter_id); |
352 | if (!adapter) { |
353 | /* Eek, no such I2C adapter! Bail out. */ |
354 | dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n" , |
355 | plat_chip_data->addr, pdata->i2c_adapter_id); |
356 | return -ENODEV; |
357 | } |
358 | |
359 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) { |
360 | dev_warn(dev, "i2c adapter %d non-functional\n" , |
361 | pdata->i2c_adapter_id); |
362 | return -EINVAL; |
363 | } |
364 | |
365 | memset(&info, 0, sizeof(struct i2c_board_info)); |
366 | info.addr = plat_chip_data->addr; |
367 | strlcpy(info.type, "htcpld-chip" , I2C_NAME_SIZE); |
368 | info.platform_data = chip; |
369 | |
370 | /* Add the I2C device. This calls the probe() function. */ |
371 | client = i2c_new_device(adapter, &info); |
372 | if (!client) { |
373 | /* I2C device registration failed, contineu with the next */ |
374 | dev_warn(dev, "Unable to add I2C device for 0x%x\n" , |
375 | plat_chip_data->addr); |
376 | return -ENODEV; |
377 | } |
378 | |
379 | i2c_set_clientdata(client, chip); |
380 | snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%x" , client->addr); |
381 | chip->client = client; |
382 | |
383 | /* Reset the chip */ |
384 | htcpld_chip_reset(client); |
385 | chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out); |
386 | |
387 | return 0; |
388 | } |
389 | |
390 | static void htcpld_unregister_chip_i2c( |
391 | struct platform_device *pdev, |
392 | int chip_index) |
393 | { |
394 | struct htcpld_data *htcpld; |
395 | struct htcpld_chip *chip; |
396 | |
397 | /* Get the platform and driver data */ |
398 | htcpld = platform_get_drvdata(pdev); |
399 | chip = &htcpld->chip[chip_index]; |
400 | |
401 | if (chip->client) |
402 | i2c_unregister_device(chip->client); |
403 | } |
404 | |
405 | static int htcpld_register_chip_gpio( |
406 | struct platform_device *pdev, |
407 | int chip_index) |
408 | { |
409 | struct htcpld_data *htcpld; |
410 | struct device *dev = &pdev->dev; |
411 | struct htcpld_core_platform_data *pdata; |
412 | struct htcpld_chip *chip; |
413 | struct htcpld_chip_platform_data *plat_chip_data; |
414 | struct gpio_chip *gpio_chip; |
415 | int ret = 0; |
416 | |
417 | /* Get the platform and driver data */ |
418 | pdata = dev_get_platdata(dev); |
419 | htcpld = platform_get_drvdata(pdev); |
420 | chip = &htcpld->chip[chip_index]; |
421 | plat_chip_data = &pdata->chip[chip_index]; |
422 | |
423 | /* Setup the GPIO chips */ |
424 | gpio_chip = &(chip->chip_out); |
425 | gpio_chip->label = "htcpld-out" ; |
426 | gpio_chip->parent = dev; |
427 | gpio_chip->owner = THIS_MODULE; |
428 | gpio_chip->get = htcpld_chip_get; |
429 | gpio_chip->set = htcpld_chip_set; |
430 | gpio_chip->direction_input = NULL; |
431 | gpio_chip->direction_output = htcpld_direction_output; |
432 | gpio_chip->base = plat_chip_data->gpio_out_base; |
433 | gpio_chip->ngpio = plat_chip_data->num_gpios; |
434 | |
435 | gpio_chip = &(chip->chip_in); |
436 | gpio_chip->label = "htcpld-in" ; |
437 | gpio_chip->parent = dev; |
438 | gpio_chip->owner = THIS_MODULE; |
439 | gpio_chip->get = htcpld_chip_get; |
440 | gpio_chip->set = NULL; |
441 | gpio_chip->direction_input = htcpld_direction_input; |
442 | gpio_chip->direction_output = NULL; |
443 | gpio_chip->to_irq = htcpld_chip_to_irq; |
444 | gpio_chip->base = plat_chip_data->gpio_in_base; |
445 | gpio_chip->ngpio = plat_chip_data->num_gpios; |
446 | |
447 | /* Add the GPIO chips */ |
448 | ret = gpiochip_add_data(&(chip->chip_out), chip); |
449 | if (ret) { |
450 | dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n" , |
451 | plat_chip_data->addr, ret); |
452 | return ret; |
453 | } |
454 | |
455 | ret = gpiochip_add_data(&(chip->chip_in), chip); |
456 | if (ret) { |
457 | dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n" , |
458 | plat_chip_data->addr, ret); |
459 | gpiochip_remove(&(chip->chip_out)); |
460 | return ret; |
461 | } |
462 | |
463 | return 0; |
464 | } |
465 | |
466 | static int htcpld_setup_chips(struct platform_device *pdev) |
467 | { |
468 | struct htcpld_data *htcpld; |
469 | struct device *dev = &pdev->dev; |
470 | struct htcpld_core_platform_data *pdata; |
471 | int i; |
472 | |
473 | /* Get the platform and driver data */ |
474 | pdata = dev_get_platdata(dev); |
475 | htcpld = platform_get_drvdata(pdev); |
476 | |
477 | /* Setup each chip's output GPIOs */ |
478 | htcpld->nchips = pdata->num_chip; |
479 | htcpld->chip = devm_kcalloc(dev, |
480 | htcpld->nchips, |
481 | sizeof(struct htcpld_chip), |
482 | GFP_KERNEL); |
483 | if (!htcpld->chip) |
484 | return -ENOMEM; |
485 | |
486 | /* Add the chips as best we can */ |
487 | for (i = 0; i < htcpld->nchips; i++) { |
488 | int ret; |
489 | |
490 | /* Setup the HTCPLD chips */ |
491 | htcpld->chip[i].reset = pdata->chip[i].reset; |
492 | htcpld->chip[i].cache_out = pdata->chip[i].reset; |
493 | htcpld->chip[i].cache_in = 0; |
494 | htcpld->chip[i].dev = dev; |
495 | htcpld->chip[i].irq_start = pdata->chip[i].irq_base; |
496 | htcpld->chip[i].nirqs = pdata->chip[i].num_irqs; |
497 | |
498 | INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni); |
499 | spin_lock_init(&(htcpld->chip[i].lock)); |
500 | |
501 | /* Setup the interrupts for the chip */ |
502 | if (htcpld->chained_irq) { |
503 | ret = htcpld_setup_chip_irq(pdev, i); |
504 | if (ret) |
505 | continue; |
506 | } |
507 | |
508 | /* Register the chip with I2C */ |
509 | ret = htcpld_register_chip_i2c(pdev, i); |
510 | if (ret) |
511 | continue; |
512 | |
513 | |
514 | /* Register the chips with the GPIO subsystem */ |
515 | ret = htcpld_register_chip_gpio(pdev, i); |
516 | if (ret) { |
517 | /* Unregister the chip from i2c and continue */ |
518 | htcpld_unregister_chip_i2c(pdev, i); |
519 | continue; |
520 | } |
521 | |
522 | dev_info(dev, "Registered chip at 0x%x\n" , pdata->chip[i].addr); |
523 | } |
524 | |
525 | return 0; |
526 | } |
527 | |
528 | static int htcpld_core_probe(struct platform_device *pdev) |
529 | { |
530 | struct htcpld_data *htcpld; |
531 | struct device *dev = &pdev->dev; |
532 | struct htcpld_core_platform_data *pdata; |
533 | struct resource *res; |
534 | int ret = 0; |
535 | |
536 | if (!dev) |
537 | return -ENODEV; |
538 | |
539 | pdata = dev_get_platdata(dev); |
540 | if (!pdata) { |
541 | dev_warn(dev, "Platform data not found for htcpld core!\n" ); |
542 | return -ENXIO; |
543 | } |
544 | |
545 | htcpld = devm_kzalloc(dev, sizeof(struct htcpld_data), GFP_KERNEL); |
546 | if (!htcpld) |
547 | return -ENOMEM; |
548 | |
549 | /* Find chained irq */ |
550 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
551 | if (res) { |
552 | int flags; |
553 | htcpld->chained_irq = res->start; |
554 | |
555 | /* Setup the chained interrupt handler */ |
556 | flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | |
557 | IRQF_ONESHOT; |
558 | ret = request_threaded_irq(htcpld->chained_irq, |
559 | NULL, htcpld_handler, |
560 | flags, pdev->name, htcpld); |
561 | if (ret) { |
562 | dev_warn(dev, "Unable to setup chained irq handler: %d\n" , ret); |
563 | return ret; |
564 | } else |
565 | device_init_wakeup(dev, 0); |
566 | } |
567 | |
568 | /* Set the driver data */ |
569 | platform_set_drvdata(pdev, htcpld); |
570 | |
571 | /* Setup the htcpld chips */ |
572 | ret = htcpld_setup_chips(pdev); |
573 | if (ret) |
574 | return ret; |
575 | |
576 | /* Request the GPIO(s) for the int reset and set them up */ |
577 | if (pdata->int_reset_gpio_hi) { |
578 | ret = gpio_request(pdata->int_reset_gpio_hi, "htcpld-core" ); |
579 | if (ret) { |
580 | /* |
581 | * If it failed, that sucks, but we can probably |
582 | * continue on without it. |
583 | */ |
584 | dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n" ); |
585 | htcpld->int_reset_gpio_hi = 0; |
586 | } else { |
587 | htcpld->int_reset_gpio_hi = pdata->int_reset_gpio_hi; |
588 | gpio_set_value(htcpld->int_reset_gpio_hi, 1); |
589 | } |
590 | } |
591 | |
592 | if (pdata->int_reset_gpio_lo) { |
593 | ret = gpio_request(pdata->int_reset_gpio_lo, "htcpld-core" ); |
594 | if (ret) { |
595 | /* |
596 | * If it failed, that sucks, but we can probably |
597 | * continue on without it. |
598 | */ |
599 | dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n" ); |
600 | htcpld->int_reset_gpio_lo = 0; |
601 | } else { |
602 | htcpld->int_reset_gpio_lo = pdata->int_reset_gpio_lo; |
603 | gpio_set_value(htcpld->int_reset_gpio_lo, 0); |
604 | } |
605 | } |
606 | |
607 | dev_info(dev, "Initialized successfully\n" ); |
608 | return 0; |
609 | } |
610 | |
611 | /* The I2C Driver -- used internally */ |
612 | static const struct i2c_device_id htcpld_chip_id[] = { |
613 | { "htcpld-chip" , 0 }, |
614 | { } |
615 | }; |
616 | |
617 | static struct i2c_driver htcpld_chip_driver = { |
618 | .driver = { |
619 | .name = "htcpld-chip" , |
620 | }, |
621 | .id_table = htcpld_chip_id, |
622 | }; |
623 | |
624 | /* The Core Driver */ |
625 | static struct platform_driver htcpld_core_driver = { |
626 | .driver = { |
627 | .name = "i2c-htcpld" , |
628 | }, |
629 | }; |
630 | |
631 | static int __init htcpld_core_init(void) |
632 | { |
633 | int ret; |
634 | |
635 | /* Register the I2C Chip driver */ |
636 | ret = i2c_add_driver(&htcpld_chip_driver); |
637 | if (ret) |
638 | return ret; |
639 | |
640 | /* Probe for our chips */ |
641 | return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe); |
642 | } |
643 | device_initcall(htcpld_core_init); |
644 | |