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; |
62154991 | 76 | const char *const *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 | ||
6f5cfc0e | 231 | static void pca953x_irq_mask(struct irq_data *d) |
89ea8bbe | 232 | { |
6f5cfc0e | 233 | struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); |
89ea8bbe | 234 | |
6f5cfc0e | 235 | chip->irq_mask &= ~(1 << (d->irq - chip->irq_base)); |
89ea8bbe MZ |
236 | } |
237 | ||
6f5cfc0e | 238 | static void pca953x_irq_unmask(struct irq_data *d) |
89ea8bbe | 239 | { |
6f5cfc0e | 240 | struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); |
89ea8bbe | 241 | |
6f5cfc0e | 242 | chip->irq_mask |= 1 << (d->irq - chip->irq_base); |
89ea8bbe MZ |
243 | } |
244 | ||
6f5cfc0e | 245 | static void pca953x_irq_bus_lock(struct irq_data *d) |
89ea8bbe | 246 | { |
6f5cfc0e | 247 | struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); |
89ea8bbe MZ |
248 | |
249 | mutex_lock(&chip->irq_lock); | |
250 | } | |
251 | ||
6f5cfc0e | 252 | static void pca953x_irq_bus_sync_unlock(struct irq_data *d) |
89ea8bbe | 253 | { |
6f5cfc0e | 254 | struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); |
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 | ||
6f5cfc0e | 271 | static int pca953x_irq_set_type(struct irq_data *d, unsigned int type) |
89ea8bbe | 272 | { |
6f5cfc0e LB |
273 | struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); |
274 | uint16_t level = d->irq - chip->irq_base; | |
89ea8bbe MZ |
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", | |
6f5cfc0e | 279 | d->irq, type); |
89ea8bbe MZ |
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", | |
6f5cfc0e LB |
298 | .irq_mask = pca953x_irq_mask, |
299 | .irq_unmask = pca953x_irq_unmask, | |
300 | .irq_bus_lock = pca953x_irq_bus_lock, | |
301 | .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock, | |
302 | .irq_set_type = pca953x_irq_set_type, | |
89ea8bbe MZ |
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); | |
8a233f01 | 348 | generic_handle_irq(level + chip->irq_base); |
89ea8bbe MZ |
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 | ||
8a233f01 AD |
363 | if (pdata->irq_base != -1 |
364 | && (id->driver_data & PCA953X_INT)) { | |
89ea8bbe MZ |
365 | int lvl; |
366 | ||
367 | ret = pca953x_read_reg(chip, PCA953X_INPUT, | |
368 | &chip->irq_stat); | |
369 | if (ret) | |
370 | goto out_failed; | |
371 | ||
372 | /* | |
373 | * There is no way to know which GPIO line generated the | |
374 | * interrupt. We have to rely on the previous read for | |
375 | * this purpose. | |
376 | */ | |
377 | chip->irq_stat &= chip->reg_direction; | |
378 | chip->irq_base = pdata->irq_base; | |
379 | mutex_init(&chip->irq_lock); | |
380 | ||
381 | for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) { | |
382 | int irq = lvl + chip->irq_base; | |
383 | ||
384 | set_irq_chip_data(irq, chip); | |
385 | set_irq_chip_and_handler(irq, &pca953x_irq_chip, | |
386 | handle_edge_irq); | |
89ea8bbe MZ |
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, | |
8a233f01 | 397 | IRQF_TRIGGER_RISING | |
89ea8bbe MZ |
398 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
399 | dev_name(&client->dev), chip); | |
400 | if (ret) { | |
401 | dev_err(&client->dev, "failed to request irq %d\n", | |
402 | client->irq); | |
403 | goto out_failed; | |
404 | } | |
405 | ||
406 | chip->gpio_chip.to_irq = pca953x_gpio_to_irq; | |
407 | } | |
408 | ||
409 | return 0; | |
410 | ||
411 | out_failed: | |
8a233f01 | 412 | chip->irq_base = -1; |
89ea8bbe MZ |
413 | return ret; |
414 | } | |
415 | ||
416 | static void pca953x_irq_teardown(struct pca953x_chip *chip) | |
417 | { | |
8a233f01 | 418 | if (chip->irq_base != -1) |
89ea8bbe MZ |
419 | free_irq(chip->client->irq, chip); |
420 | } | |
421 | #else /* CONFIG_GPIO_PCA953X_IRQ */ | |
422 | static int pca953x_irq_setup(struct pca953x_chip *chip, | |
423 | const struct i2c_device_id *id) | |
424 | { | |
425 | struct i2c_client *client = chip->client; | |
426 | struct pca953x_platform_data *pdata = client->dev.platform_data; | |
427 | ||
8a233f01 | 428 | if (pdata->irq_base != -1 && (id->driver_data & PCA953X_INT)) |
89ea8bbe MZ |
429 | dev_warn(&client->dev, "interrupt support not compiled in\n"); |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | static void pca953x_irq_teardown(struct pca953x_chip *chip) | |
435 | { | |
436 | } | |
437 | #endif | |
438 | ||
1965d303 NC |
439 | /* |
440 | * Handlers for alternative sources of platform_data | |
441 | */ | |
442 | #ifdef CONFIG_OF_GPIO | |
443 | /* | |
444 | * Translate OpenFirmware node properties into platform_data | |
445 | */ | |
446 | static struct pca953x_platform_data * | |
447 | pca953x_get_alt_pdata(struct i2c_client *client) | |
448 | { | |
449 | struct pca953x_platform_data *pdata; | |
450 | struct device_node *node; | |
451 | const uint16_t *val; | |
452 | ||
61c7a080 | 453 | node = client->dev.of_node; |
1965d303 NC |
454 | if (node == NULL) |
455 | return NULL; | |
456 | ||
457 | pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL); | |
458 | if (pdata == NULL) { | |
459 | dev_err(&client->dev, "Unable to allocate platform_data\n"); | |
460 | return NULL; | |
461 | } | |
462 | ||
463 | pdata->gpio_base = -1; | |
464 | val = of_get_property(node, "linux,gpio-base", NULL); | |
465 | if (val) { | |
466 | if (*val < 0) | |
467 | dev_warn(&client->dev, | |
468 | "invalid gpio-base in device tree\n"); | |
469 | else | |
470 | pdata->gpio_base = *val; | |
471 | } | |
472 | ||
473 | val = of_get_property(node, "polarity", NULL); | |
474 | if (val) | |
475 | pdata->invert = *val; | |
476 | ||
477 | return pdata; | |
478 | } | |
479 | #else | |
480 | static struct pca953x_platform_data * | |
481 | pca953x_get_alt_pdata(struct i2c_client *client) | |
482 | { | |
483 | return NULL; | |
484 | } | |
485 | #endif | |
486 | ||
d2653e92 | 487 | static int __devinit pca953x_probe(struct i2c_client *client, |
3760f736 | 488 | const struct i2c_device_id *id) |
9e60fdcf | 489 | { |
f3dc3630 GL |
490 | struct pca953x_platform_data *pdata; |
491 | struct pca953x_chip *chip; | |
f39e5781 | 492 | int ret; |
9e60fdcf | 493 | |
1965d303 NC |
494 | chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL); |
495 | if (chip == NULL) | |
496 | return -ENOMEM; | |
497 | ||
9e60fdcf | 498 | pdata = client->dev.platform_data; |
a342d215 | 499 | if (pdata == NULL) { |
1965d303 NC |
500 | pdata = pca953x_get_alt_pdata(client); |
501 | /* | |
502 | * Unlike normal platform_data, this is allocated | |
503 | * dynamically and must be freed in the driver | |
504 | */ | |
505 | chip->dyn_pdata = pdata; | |
a342d215 | 506 | } |
9e60fdcf | 507 | |
1965d303 NC |
508 | if (pdata == NULL) { |
509 | dev_dbg(&client->dev, "no platform data\n"); | |
510 | ret = -EINVAL; | |
511 | goto out_failed; | |
512 | } | |
9e60fdcf | 513 | |
514 | chip->client = client; | |
515 | ||
516 | chip->gpio_start = pdata->gpio_base; | |
517 | ||
77906a54 DS |
518 | chip->names = pdata->names; |
519 | ||
9e60fdcf | 520 | /* initialize cached registers from their original values. |
521 | * we can't share this chip with another i2c master. | |
522 | */ | |
89ea8bbe | 523 | pca953x_setup_gpio(chip, id->driver_data & PCA953X_GPIOS); |
f5e8ff48 | 524 | |
f3dc3630 | 525 | ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output); |
9e60fdcf | 526 | if (ret) |
527 | goto out_failed; | |
528 | ||
f3dc3630 | 529 | ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction); |
9e60fdcf | 530 | if (ret) |
531 | goto out_failed; | |
532 | ||
533 | /* set platform specific polarity inversion */ | |
f3dc3630 | 534 | ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert); |
9e60fdcf | 535 | if (ret) |
536 | goto out_failed; | |
537 | ||
89ea8bbe MZ |
538 | ret = pca953x_irq_setup(chip, id); |
539 | if (ret) | |
540 | goto out_failed; | |
f5e8ff48 GL |
541 | |
542 | ret = gpiochip_add(&chip->gpio_chip); | |
9e60fdcf | 543 | if (ret) |
544 | goto out_failed; | |
545 | ||
546 | if (pdata->setup) { | |
547 | ret = pdata->setup(client, chip->gpio_chip.base, | |
548 | chip->gpio_chip.ngpio, pdata->context); | |
549 | if (ret < 0) | |
550 | dev_warn(&client->dev, "setup failed, %d\n", ret); | |
551 | } | |
552 | ||
553 | i2c_set_clientdata(client, chip); | |
554 | return 0; | |
555 | ||
556 | out_failed: | |
89ea8bbe | 557 | pca953x_irq_teardown(chip); |
1965d303 | 558 | kfree(chip->dyn_pdata); |
9e60fdcf | 559 | kfree(chip); |
560 | return ret; | |
561 | } | |
562 | ||
f3dc3630 | 563 | static int pca953x_remove(struct i2c_client *client) |
9e60fdcf | 564 | { |
f3dc3630 GL |
565 | struct pca953x_platform_data *pdata = client->dev.platform_data; |
566 | struct pca953x_chip *chip = i2c_get_clientdata(client); | |
9e60fdcf | 567 | int ret = 0; |
568 | ||
569 | if (pdata->teardown) { | |
570 | ret = pdata->teardown(client, chip->gpio_chip.base, | |
571 | chip->gpio_chip.ngpio, pdata->context); | |
572 | if (ret < 0) { | |
573 | dev_err(&client->dev, "%s failed, %d\n", | |
574 | "teardown", ret); | |
575 | return ret; | |
576 | } | |
577 | } | |
578 | ||
579 | ret = gpiochip_remove(&chip->gpio_chip); | |
580 | if (ret) { | |
581 | dev_err(&client->dev, "%s failed, %d\n", | |
582 | "gpiochip_remove()", ret); | |
583 | return ret; | |
584 | } | |
585 | ||
89ea8bbe | 586 | pca953x_irq_teardown(chip); |
1965d303 | 587 | kfree(chip->dyn_pdata); |
9e60fdcf | 588 | kfree(chip); |
589 | return 0; | |
590 | } | |
591 | ||
f3dc3630 | 592 | static struct i2c_driver pca953x_driver = { |
9e60fdcf | 593 | .driver = { |
f3dc3630 | 594 | .name = "pca953x", |
9e60fdcf | 595 | }, |
f3dc3630 GL |
596 | .probe = pca953x_probe, |
597 | .remove = pca953x_remove, | |
3760f736 | 598 | .id_table = pca953x_id, |
9e60fdcf | 599 | }; |
600 | ||
f3dc3630 | 601 | static int __init pca953x_init(void) |
9e60fdcf | 602 | { |
f3dc3630 | 603 | return i2c_add_driver(&pca953x_driver); |
9e60fdcf | 604 | } |
2f8d1197 DB |
605 | /* register after i2c postcore initcall and before |
606 | * subsys initcalls that may rely on these GPIOs | |
607 | */ | |
608 | subsys_initcall(pca953x_init); | |
9e60fdcf | 609 | |
f3dc3630 | 610 | static void __exit pca953x_exit(void) |
9e60fdcf | 611 | { |
f3dc3630 | 612 | i2c_del_driver(&pca953x_driver); |
9e60fdcf | 613 | } |
f3dc3630 | 614 | module_exit(pca953x_exit); |
9e60fdcf | 615 | |
616 | MODULE_AUTHOR("eric miao <eric.miao@marvell.com>"); | |
f3dc3630 | 617 | MODULE_DESCRIPTION("GPIO expander driver for PCA953x"); |
9e60fdcf | 618 | MODULE_LICENSE("GPL"); |