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