Commit | Line | Data |
---|---|---|
9e60fdcf | 1 | /* |
f5e8ff48 | 2 | * pca953x.c - 4/8/16 bit I/O ports |
9e60fdcf | 3 | * |
4 | * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com> | |
5 | * Copyright (C) 2007 Marvell International Ltd. | |
6 | * | |
7 | * Derived from drivers/i2c/chips/pca9539.c | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; version 2 of the License. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
d120c17f | 16 | #include <linux/gpio.h> |
89ea8bbe MZ |
17 | #include <linux/interrupt.h> |
18 | #include <linux/irq.h> | |
9e60fdcf | 19 | #include <linux/i2c.h> |
d1c057e3 | 20 | #include <linux/i2c/pca953x.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
1965d303 NC |
22 | #ifdef CONFIG_OF_GPIO |
23 | #include <linux/of_platform.h> | |
24 | #include <linux/of_gpio.h> | |
25 | #endif | |
9e60fdcf | 26 | |
f5e8ff48 GL |
27 | #define PCA953X_INPUT 0 |
28 | #define PCA953X_OUTPUT 1 | |
29 | #define PCA953X_INVERT 2 | |
30 | #define PCA953X_DIRECTION 3 | |
9e60fdcf | 31 | |
89ea8bbe MZ |
32 | #define PCA953X_GPIOS 0x00FF |
33 | #define PCA953X_INT 0x0100 | |
34 | ||
3760f736 | 35 | static const struct i2c_device_id pca953x_id[] = { |
89ea8bbe MZ |
36 | { "pca9534", 8 | PCA953X_INT, }, |
37 | { "pca9535", 16 | PCA953X_INT, }, | |
f5e8ff48 | 38 | { "pca9536", 4, }, |
89ea8bbe MZ |
39 | { "pca9537", 4 | PCA953X_INT, }, |
40 | { "pca9538", 8 | PCA953X_INT, }, | |
41 | { "pca9539", 16 | PCA953X_INT, }, | |
42 | { "pca9554", 8 | PCA953X_INT, }, | |
43 | { "pca9555", 16 | PCA953X_INT, }, | |
10dfb54c | 44 | { "pca9556", 8, }, |
f39e5781 | 45 | { "pca9557", 8, }, |
ab5dc372 | 46 | |
7059d4b0 | 47 | { "max7310", 8, }, |
89ea8bbe MZ |
48 | { "max7312", 16 | PCA953X_INT, }, |
49 | { "max7313", 16 | PCA953X_INT, }, | |
50 | { "max7315", 8 | PCA953X_INT, }, | |
51 | { "pca6107", 8 | PCA953X_INT, }, | |
52 | { "tca6408", 8 | PCA953X_INT, }, | |
53 | { "tca6416", 16 | PCA953X_INT, }, | |
ab5dc372 | 54 | /* NYET: { "tca6424", 24, }, */ |
3760f736 | 55 | { } |
f5e8ff48 | 56 | }; |
3760f736 | 57 | MODULE_DEVICE_TABLE(i2c, pca953x_id); |
9e60fdcf | 58 | |
f3dc3630 | 59 | struct pca953x_chip { |
9e60fdcf | 60 | unsigned gpio_start; |
61 | uint16_t reg_output; | |
62 | uint16_t reg_direction; | |
63 | ||
89ea8bbe MZ |
64 | #ifdef CONFIG_GPIO_PCA953X_IRQ |
65 | struct mutex irq_lock; | |
66 | uint16_t irq_mask; | |
67 | uint16_t irq_stat; | |
68 | uint16_t irq_trig_raise; | |
69 | uint16_t irq_trig_fall; | |
70 | int irq_base; | |
71 | #endif | |
72 | ||
9e60fdcf | 73 | struct i2c_client *client; |
1965d303 | 74 | struct pca953x_platform_data *dyn_pdata; |
9e60fdcf | 75 | struct gpio_chip gpio_chip; |
77906a54 | 76 | char **names; |
9e60fdcf | 77 | }; |
78 | ||
f3dc3630 | 79 | static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val) |
9e60fdcf | 80 | { |
f5e8ff48 GL |
81 | int ret; |
82 | ||
83 | if (chip->gpio_chip.ngpio <= 8) | |
84 | ret = i2c_smbus_write_byte_data(chip->client, reg, val); | |
9e60fdcf | 85 | else |
f5e8ff48 GL |
86 | ret = i2c_smbus_write_word_data(chip->client, reg << 1, val); |
87 | ||
88 | if (ret < 0) { | |
89 | dev_err(&chip->client->dev, "failed writing register\n"); | |
ab5dc372 | 90 | return ret; |
f5e8ff48 GL |
91 | } |
92 | ||
93 | return 0; | |
9e60fdcf | 94 | } |
95 | ||
f3dc3630 | 96 | static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val) |
9e60fdcf | 97 | { |
98 | int ret; | |
99 | ||
f5e8ff48 GL |
100 | if (chip->gpio_chip.ngpio <= 8) |
101 | ret = i2c_smbus_read_byte_data(chip->client, reg); | |
102 | else | |
103 | ret = i2c_smbus_read_word_data(chip->client, reg << 1); | |
104 | ||
9e60fdcf | 105 | if (ret < 0) { |
106 | dev_err(&chip->client->dev, "failed reading register\n"); | |
ab5dc372 | 107 | return ret; |
9e60fdcf | 108 | } |
109 | ||
110 | *val = (uint16_t)ret; | |
111 | return 0; | |
112 | } | |
113 | ||
f3dc3630 | 114 | static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off) |
9e60fdcf | 115 | { |
f3dc3630 | 116 | struct pca953x_chip *chip; |
9e60fdcf | 117 | uint16_t reg_val; |
118 | int ret; | |
119 | ||
f3dc3630 | 120 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
9e60fdcf | 121 | |
122 | reg_val = chip->reg_direction | (1u << off); | |
f3dc3630 | 123 | ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val); |
9e60fdcf | 124 | if (ret) |
125 | return ret; | |
126 | ||
127 | chip->reg_direction = reg_val; | |
128 | return 0; | |
129 | } | |
130 | ||
f3dc3630 | 131 | static int pca953x_gpio_direction_output(struct gpio_chip *gc, |
9e60fdcf | 132 | unsigned off, int val) |
133 | { | |
f3dc3630 | 134 | struct pca953x_chip *chip; |
9e60fdcf | 135 | uint16_t reg_val; |
136 | int ret; | |
137 | ||
f3dc3630 | 138 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
9e60fdcf | 139 | |
140 | /* set output level */ | |
141 | if (val) | |
142 | reg_val = chip->reg_output | (1u << off); | |
143 | else | |
144 | reg_val = chip->reg_output & ~(1u << off); | |
145 | ||
f3dc3630 | 146 | ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val); |
9e60fdcf | 147 | if (ret) |
148 | return ret; | |
149 | ||
150 | chip->reg_output = reg_val; | |
151 | ||
152 | /* then direction */ | |
153 | reg_val = chip->reg_direction & ~(1u << off); | |
f3dc3630 | 154 | ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val); |
9e60fdcf | 155 | if (ret) |
156 | return ret; | |
157 | ||
158 | chip->reg_direction = reg_val; | |
159 | return 0; | |
160 | } | |
161 | ||
f3dc3630 | 162 | static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off) |
9e60fdcf | 163 | { |
f3dc3630 | 164 | struct pca953x_chip *chip; |
9e60fdcf | 165 | uint16_t reg_val; |
166 | int ret; | |
167 | ||
f3dc3630 | 168 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
9e60fdcf | 169 | |
f3dc3630 | 170 | ret = pca953x_read_reg(chip, PCA953X_INPUT, ®_val); |
9e60fdcf | 171 | if (ret < 0) { |
172 | /* NOTE: diagnostic already emitted; that's all we should | |
173 | * do unless gpio_*_value_cansleep() calls become different | |
174 | * from their nonsleeping siblings (and report faults). | |
175 | */ | |
176 | return 0; | |
177 | } | |
178 | ||
179 | return (reg_val & (1u << off)) ? 1 : 0; | |
180 | } | |
181 | ||
f3dc3630 | 182 | static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val) |
9e60fdcf | 183 | { |
f3dc3630 | 184 | struct pca953x_chip *chip; |
9e60fdcf | 185 | uint16_t reg_val; |
186 | int ret; | |
187 | ||
f3dc3630 | 188 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
9e60fdcf | 189 | |
190 | if (val) | |
191 | reg_val = chip->reg_output | (1u << off); | |
192 | else | |
193 | reg_val = chip->reg_output & ~(1u << off); | |
194 | ||
f3dc3630 | 195 | ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val); |
9e60fdcf | 196 | if (ret) |
197 | return; | |
198 | ||
199 | chip->reg_output = reg_val; | |
200 | } | |
201 | ||
f5e8ff48 | 202 | static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios) |
9e60fdcf | 203 | { |
204 | struct gpio_chip *gc; | |
205 | ||
206 | gc = &chip->gpio_chip; | |
207 | ||
f3dc3630 GL |
208 | gc->direction_input = pca953x_gpio_direction_input; |
209 | gc->direction_output = pca953x_gpio_direction_output; | |
210 | gc->get = pca953x_gpio_get_value; | |
211 | gc->set = pca953x_gpio_set_value; | |
84207805 | 212 | gc->can_sleep = 1; |
9e60fdcf | 213 | |
214 | gc->base = chip->gpio_start; | |
f5e8ff48 GL |
215 | gc->ngpio = gpios; |
216 | gc->label = chip->client->name; | |
d8f388d8 | 217 | gc->dev = &chip->client->dev; |
d72cbed0 | 218 | gc->owner = THIS_MODULE; |
77906a54 | 219 | gc->names = chip->names; |
9e60fdcf | 220 | } |
221 | ||
89ea8bbe MZ |
222 | #ifdef CONFIG_GPIO_PCA953X_IRQ |
223 | static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off) | |
224 | { | |
225 | struct pca953x_chip *chip; | |
226 | ||
227 | chip = container_of(gc, struct pca953x_chip, gpio_chip); | |
228 | return chip->irq_base + off; | |
229 | } | |
230 | ||
231 | static void pca953x_irq_mask(unsigned int irq) | |
232 | { | |
233 | struct pca953x_chip *chip = get_irq_chip_data(irq); | |
234 | ||
235 | chip->irq_mask &= ~(1 << (irq - chip->irq_base)); | |
236 | } | |
237 | ||
238 | static void pca953x_irq_unmask(unsigned int irq) | |
239 | { | |
240 | struct pca953x_chip *chip = get_irq_chip_data(irq); | |
241 | ||
242 | chip->irq_mask |= 1 << (irq - chip->irq_base); | |
243 | } | |
244 | ||
245 | static void pca953x_irq_bus_lock(unsigned int irq) | |
246 | { | |
247 | struct pca953x_chip *chip = get_irq_chip_data(irq); | |
248 | ||
249 | mutex_lock(&chip->irq_lock); | |
250 | } | |
251 | ||
252 | static void pca953x_irq_bus_sync_unlock(unsigned int irq) | |
253 | { | |
254 | struct pca953x_chip *chip = get_irq_chip_data(irq); | |
a2cb9aeb MZ |
255 | uint16_t new_irqs; |
256 | uint16_t level; | |
257 | ||
258 | /* Look for any newly setup interrupt */ | |
259 | new_irqs = chip->irq_trig_fall | chip->irq_trig_raise; | |
260 | new_irqs &= ~chip->reg_direction; | |
261 | ||
262 | while (new_irqs) { | |
263 | level = __ffs(new_irqs); | |
264 | pca953x_gpio_direction_input(&chip->gpio_chip, level); | |
265 | new_irqs &= ~(1 << level); | |
266 | } | |
89ea8bbe MZ |
267 | |
268 | mutex_unlock(&chip->irq_lock); | |
269 | } | |
270 | ||
271 | static int pca953x_irq_set_type(unsigned int irq, unsigned int type) | |
272 | { | |
273 | struct pca953x_chip *chip = get_irq_chip_data(irq); | |
274 | uint16_t level = irq - chip->irq_base; | |
275 | uint16_t mask = 1 << level; | |
276 | ||
277 | if (!(type & IRQ_TYPE_EDGE_BOTH)) { | |
278 | dev_err(&chip->client->dev, "irq %d: unsupported type %d\n", | |
279 | irq, type); | |
280 | return -EINVAL; | |
281 | } | |
282 | ||
283 | if (type & IRQ_TYPE_EDGE_FALLING) | |
284 | chip->irq_trig_fall |= mask; | |
285 | else | |
286 | chip->irq_trig_fall &= ~mask; | |
287 | ||
288 | if (type & IRQ_TYPE_EDGE_RISING) | |
289 | chip->irq_trig_raise |= mask; | |
290 | else | |
291 | chip->irq_trig_raise &= ~mask; | |
292 | ||
a2cb9aeb | 293 | return 0; |
89ea8bbe MZ |
294 | } |
295 | ||
296 | static struct irq_chip pca953x_irq_chip = { | |
297 | .name = "pca953x", | |
298 | .mask = pca953x_irq_mask, | |
299 | .unmask = pca953x_irq_unmask, | |
300 | .bus_lock = pca953x_irq_bus_lock, | |
301 | .bus_sync_unlock = pca953x_irq_bus_sync_unlock, | |
302 | .set_type = pca953x_irq_set_type, | |
303 | }; | |
304 | ||
305 | static uint16_t pca953x_irq_pending(struct pca953x_chip *chip) | |
306 | { | |
307 | uint16_t cur_stat; | |
308 | uint16_t old_stat; | |
309 | uint16_t pending; | |
310 | uint16_t trigger; | |
311 | int ret; | |
312 | ||
313 | ret = pca953x_read_reg(chip, PCA953X_INPUT, &cur_stat); | |
314 | if (ret) | |
315 | return 0; | |
316 | ||
317 | /* Remove output pins from the equation */ | |
318 | cur_stat &= chip->reg_direction; | |
319 | ||
320 | old_stat = chip->irq_stat; | |
321 | trigger = (cur_stat ^ old_stat) & chip->irq_mask; | |
322 | ||
323 | if (!trigger) | |
324 | return 0; | |
325 | ||
326 | chip->irq_stat = cur_stat; | |
327 | ||
328 | pending = (old_stat & chip->irq_trig_fall) | | |
329 | (cur_stat & chip->irq_trig_raise); | |
330 | pending &= trigger; | |
331 | ||
332 | return pending; | |
333 | } | |
334 | ||
335 | static irqreturn_t pca953x_irq_handler(int irq, void *devid) | |
336 | { | |
337 | struct pca953x_chip *chip = devid; | |
338 | uint16_t pending; | |
339 | uint16_t level; | |
340 | ||
341 | pending = pca953x_irq_pending(chip); | |
342 | ||
343 | if (!pending) | |
344 | return IRQ_HANDLED; | |
345 | ||
346 | do { | |
347 | level = __ffs(pending); | |
348 | handle_nested_irq(level + chip->irq_base); | |
349 | ||
350 | pending &= ~(1 << level); | |
351 | } while (pending); | |
352 | ||
353 | return IRQ_HANDLED; | |
354 | } | |
355 | ||
356 | static int pca953x_irq_setup(struct pca953x_chip *chip, | |
357 | const struct i2c_device_id *id) | |
358 | { | |
359 | struct i2c_client *client = chip->client; | |
360 | struct pca953x_platform_data *pdata = client->dev.platform_data; | |
361 | int ret; | |
362 | ||
363 | if (pdata->irq_base && (id->driver_data & PCA953X_INT)) { | |
364 | int lvl; | |
365 | ||
366 | ret = pca953x_read_reg(chip, PCA953X_INPUT, | |
367 | &chip->irq_stat); | |
368 | if (ret) | |
369 | goto out_failed; | |
370 | ||
371 | /* | |
372 | * There is no way to know which GPIO line generated the | |
373 | * interrupt. We have to rely on the previous read for | |
374 | * this purpose. | |
375 | */ | |
376 | chip->irq_stat &= chip->reg_direction; | |
377 | chip->irq_base = pdata->irq_base; | |
378 | mutex_init(&chip->irq_lock); | |
379 | ||
380 | for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) { | |
381 | int irq = lvl + chip->irq_base; | |
382 | ||
383 | set_irq_chip_data(irq, chip); | |
384 | set_irq_chip_and_handler(irq, &pca953x_irq_chip, | |
385 | handle_edge_irq); | |
386 | set_irq_nested_thread(irq, 1); | |
387 | #ifdef CONFIG_ARM | |
388 | set_irq_flags(irq, IRQF_VALID); | |
389 | #else | |
390 | set_irq_noprobe(irq); | |
391 | #endif | |
392 | } | |
393 | ||
394 | ret = request_threaded_irq(client->irq, | |
395 | NULL, | |
396 | pca953x_irq_handler, | |
397 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
398 | dev_name(&client->dev), chip); | |
399 | if (ret) { | |
400 | dev_err(&client->dev, "failed to request irq %d\n", | |
401 | client->irq); | |
402 | goto out_failed; | |
403 | } | |
404 | ||
405 | chip->gpio_chip.to_irq = pca953x_gpio_to_irq; | |
406 | } | |
407 | ||
408 | return 0; | |
409 | ||
410 | out_failed: | |
411 | chip->irq_base = 0; | |
412 | return ret; | |
413 | } | |
414 | ||
415 | static void pca953x_irq_teardown(struct pca953x_chip *chip) | |
416 | { | |
417 | if (chip->irq_base) | |
418 | free_irq(chip->client->irq, chip); | |
419 | } | |
420 | #else /* CONFIG_GPIO_PCA953X_IRQ */ | |
421 | static int pca953x_irq_setup(struct pca953x_chip *chip, | |
422 | const struct i2c_device_id *id) | |
423 | { | |
424 | struct i2c_client *client = chip->client; | |
425 | struct pca953x_platform_data *pdata = client->dev.platform_data; | |
426 | ||
427 | if (pdata->irq_base && (id->driver_data & PCA953X_INT)) | |
428 | dev_warn(&client->dev, "interrupt support not compiled in\n"); | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | static void pca953x_irq_teardown(struct pca953x_chip *chip) | |
434 | { | |
435 | } | |
436 | #endif | |
437 | ||
1965d303 NC |
438 | /* |
439 | * Handlers for alternative sources of platform_data | |
440 | */ | |
441 | #ifdef CONFIG_OF_GPIO | |
442 | /* | |
443 | * Translate OpenFirmware node properties into platform_data | |
444 | */ | |
445 | static struct pca953x_platform_data * | |
446 | pca953x_get_alt_pdata(struct i2c_client *client) | |
447 | { | |
448 | struct pca953x_platform_data *pdata; | |
449 | struct device_node *node; | |
450 | const uint16_t *val; | |
451 | ||
452 | node = dev_archdata_get_node(&client->dev.archdata); | |
453 | if (node == NULL) | |
454 | return NULL; | |
455 | ||
456 | pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL); | |
457 | if (pdata == NULL) { | |
458 | dev_err(&client->dev, "Unable to allocate platform_data\n"); | |
459 | return NULL; | |
460 | } | |
461 | ||
462 | pdata->gpio_base = -1; | |
463 | val = of_get_property(node, "linux,gpio-base", NULL); | |
464 | if (val) { | |
465 | if (*val < 0) | |
466 | dev_warn(&client->dev, | |
467 | "invalid gpio-base in device tree\n"); | |
468 | else | |
469 | pdata->gpio_base = *val; | |
470 | } | |
471 | ||
472 | val = of_get_property(node, "polarity", NULL); | |
473 | if (val) | |
474 | pdata->invert = *val; | |
475 | ||
476 | return pdata; | |
477 | } | |
478 | #else | |
479 | static struct pca953x_platform_data * | |
480 | pca953x_get_alt_pdata(struct i2c_client *client) | |
481 | { | |
482 | return NULL; | |
483 | } | |
484 | #endif | |
485 | ||
d2653e92 | 486 | static int __devinit pca953x_probe(struct i2c_client *client, |
3760f736 | 487 | const struct i2c_device_id *id) |
9e60fdcf | 488 | { |
f3dc3630 GL |
489 | struct pca953x_platform_data *pdata; |
490 | struct pca953x_chip *chip; | |
f39e5781 | 491 | int ret; |
9e60fdcf | 492 | |
1965d303 NC |
493 | chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL); |
494 | if (chip == NULL) | |
495 | return -ENOMEM; | |
496 | ||
9e60fdcf | 497 | pdata = client->dev.platform_data; |
a342d215 | 498 | if (pdata == NULL) { |
1965d303 NC |
499 | pdata = pca953x_get_alt_pdata(client); |
500 | /* | |
501 | * Unlike normal platform_data, this is allocated | |
502 | * dynamically and must be freed in the driver | |
503 | */ | |
504 | chip->dyn_pdata = pdata; | |
a342d215 | 505 | } |
9e60fdcf | 506 | |
1965d303 NC |
507 | if (pdata == NULL) { |
508 | dev_dbg(&client->dev, "no platform data\n"); | |
509 | ret = -EINVAL; | |
510 | goto out_failed; | |
511 | } | |
9e60fdcf | 512 | |
513 | chip->client = client; | |
514 | ||
515 | chip->gpio_start = pdata->gpio_base; | |
516 | ||
77906a54 DS |
517 | chip->names = pdata->names; |
518 | ||
9e60fdcf | 519 | /* initialize cached registers from their original values. |
520 | * we can't share this chip with another i2c master. | |
521 | */ | |
89ea8bbe | 522 | pca953x_setup_gpio(chip, id->driver_data & PCA953X_GPIOS); |
f5e8ff48 | 523 | |
f3dc3630 | 524 | ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output); |
9e60fdcf | 525 | if (ret) |
526 | goto out_failed; | |
527 | ||
f3dc3630 | 528 | ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction); |
9e60fdcf | 529 | if (ret) |
530 | goto out_failed; | |
531 | ||
532 | /* set platform specific polarity inversion */ | |
f3dc3630 | 533 | ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert); |
9e60fdcf | 534 | if (ret) |
535 | goto out_failed; | |
536 | ||
89ea8bbe MZ |
537 | ret = pca953x_irq_setup(chip, id); |
538 | if (ret) | |
539 | goto out_failed; | |
f5e8ff48 GL |
540 | |
541 | ret = gpiochip_add(&chip->gpio_chip); | |
9e60fdcf | 542 | if (ret) |
543 | goto out_failed; | |
544 | ||
545 | if (pdata->setup) { | |
546 | ret = pdata->setup(client, chip->gpio_chip.base, | |
547 | chip->gpio_chip.ngpio, pdata->context); | |
548 | if (ret < 0) | |
549 | dev_warn(&client->dev, "setup failed, %d\n", ret); | |
550 | } | |
551 | ||
552 | i2c_set_clientdata(client, chip); | |
553 | return 0; | |
554 | ||
555 | out_failed: | |
89ea8bbe | 556 | pca953x_irq_teardown(chip); |
1965d303 | 557 | kfree(chip->dyn_pdata); |
9e60fdcf | 558 | kfree(chip); |
559 | return ret; | |
560 | } | |
561 | ||
f3dc3630 | 562 | static int pca953x_remove(struct i2c_client *client) |
9e60fdcf | 563 | { |
f3dc3630 GL |
564 | struct pca953x_platform_data *pdata = client->dev.platform_data; |
565 | struct pca953x_chip *chip = i2c_get_clientdata(client); | |
9e60fdcf | 566 | int ret = 0; |
567 | ||
568 | if (pdata->teardown) { | |
569 | ret = pdata->teardown(client, chip->gpio_chip.base, | |
570 | chip->gpio_chip.ngpio, pdata->context); | |
571 | if (ret < 0) { | |
572 | dev_err(&client->dev, "%s failed, %d\n", | |
573 | "teardown", ret); | |
574 | return ret; | |
575 | } | |
576 | } | |
577 | ||
578 | ret = gpiochip_remove(&chip->gpio_chip); | |
579 | if (ret) { | |
580 | dev_err(&client->dev, "%s failed, %d\n", | |
581 | "gpiochip_remove()", ret); | |
582 | return ret; | |
583 | } | |
584 | ||
89ea8bbe | 585 | pca953x_irq_teardown(chip); |
1965d303 | 586 | kfree(chip->dyn_pdata); |
9e60fdcf | 587 | kfree(chip); |
588 | return 0; | |
589 | } | |
590 | ||
f3dc3630 | 591 | static struct i2c_driver pca953x_driver = { |
9e60fdcf | 592 | .driver = { |
f3dc3630 | 593 | .name = "pca953x", |
9e60fdcf | 594 | }, |
f3dc3630 GL |
595 | .probe = pca953x_probe, |
596 | .remove = pca953x_remove, | |
3760f736 | 597 | .id_table = pca953x_id, |
9e60fdcf | 598 | }; |
599 | ||
f3dc3630 | 600 | static int __init pca953x_init(void) |
9e60fdcf | 601 | { |
f3dc3630 | 602 | return i2c_add_driver(&pca953x_driver); |
9e60fdcf | 603 | } |
2f8d1197 DB |
604 | /* register after i2c postcore initcall and before |
605 | * subsys initcalls that may rely on these GPIOs | |
606 | */ | |
607 | subsys_initcall(pca953x_init); | |
9e60fdcf | 608 | |
f3dc3630 | 609 | static void __exit pca953x_exit(void) |
9e60fdcf | 610 | { |
f3dc3630 | 611 | i2c_del_driver(&pca953x_driver); |
9e60fdcf | 612 | } |
f3dc3630 | 613 | module_exit(pca953x_exit); |
9e60fdcf | 614 | |
615 | MODULE_AUTHOR("eric miao <eric.miao@marvell.com>"); | |
f3dc3630 | 616 | MODULE_DESCRIPTION("GPIO expander driver for PCA953x"); |
9e60fdcf | 617 | MODULE_LICENSE("GPL"); |