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Merge tag 'backlight-for-linus-3.17' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / drivers / gpio / gpio-pca953x.c
1 /*
2 * PCA953x 4/8/16/24/40 bit I/O ports
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>
16 #include <linux/gpio.h>
17 #include <linux/interrupt.h>
18 #include <linux/i2c.h>
19 #include <linux/platform_data/pca953x.h>
20 #include <linux/slab.h>
21 #ifdef CONFIG_OF_GPIO
22 #include <linux/of_platform.h>
23 #endif
24
25 #define PCA953X_INPUT 0
26 #define PCA953X_OUTPUT 1
27 #define PCA953X_INVERT 2
28 #define PCA953X_DIRECTION 3
29
30 #define REG_ADDR_AI 0x80
31
32 #define PCA957X_IN 0
33 #define PCA957X_INVRT 1
34 #define PCA957X_BKEN 2
35 #define PCA957X_PUPD 3
36 #define PCA957X_CFG 4
37 #define PCA957X_OUT 5
38 #define PCA957X_MSK 6
39 #define PCA957X_INTS 7
40
41 #define PCA_GPIO_MASK 0x00FF
42 #define PCA_INT 0x0100
43 #define PCA953X_TYPE 0x1000
44 #define PCA957X_TYPE 0x2000
45
46 static const struct i2c_device_id pca953x_id[] = {
47 { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
48 { "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
49 { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
50 { "pca9536", 4 | PCA953X_TYPE, },
51 { "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
52 { "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
53 { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
54 { "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
55 { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
56 { "pca9556", 8 | PCA953X_TYPE, },
57 { "pca9557", 8 | PCA953X_TYPE, },
58 { "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
59 { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
60 { "pca9698", 40 | PCA953X_TYPE, },
61
62 { "max7310", 8 | PCA953X_TYPE, },
63 { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
64 { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
65 { "max7315", 8 | PCA953X_TYPE | PCA_INT, },
66 { "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
67 { "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
68 { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
69 { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
70 { "xra1202", 8 | PCA953X_TYPE },
71 { }
72 };
73 MODULE_DEVICE_TABLE(i2c, pca953x_id);
74
75 #define MAX_BANK 5
76 #define BANK_SZ 8
77
78 #define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
79
80 struct pca953x_chip {
81 unsigned gpio_start;
82 u8 reg_output[MAX_BANK];
83 u8 reg_direction[MAX_BANK];
84 struct mutex i2c_lock;
85
86 #ifdef CONFIG_GPIO_PCA953X_IRQ
87 struct mutex irq_lock;
88 u8 irq_mask[MAX_BANK];
89 u8 irq_stat[MAX_BANK];
90 u8 irq_trig_raise[MAX_BANK];
91 u8 irq_trig_fall[MAX_BANK];
92 #endif
93
94 struct i2c_client *client;
95 struct gpio_chip gpio_chip;
96 const char *const *names;
97 int chip_type;
98 };
99
100 static inline struct pca953x_chip *to_pca(struct gpio_chip *gc)
101 {
102 return container_of(gc, struct pca953x_chip, gpio_chip);
103 }
104
105 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
106 int off)
107 {
108 int ret;
109 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
110 int offset = off / BANK_SZ;
111
112 ret = i2c_smbus_read_byte_data(chip->client,
113 (reg << bank_shift) + offset);
114 *val = ret;
115
116 if (ret < 0) {
117 dev_err(&chip->client->dev, "failed reading register\n");
118 return ret;
119 }
120
121 return 0;
122 }
123
124 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
125 int off)
126 {
127 int ret = 0;
128 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
129 int offset = off / BANK_SZ;
130
131 ret = i2c_smbus_write_byte_data(chip->client,
132 (reg << bank_shift) + offset, val);
133
134 if (ret < 0) {
135 dev_err(&chip->client->dev, "failed writing register\n");
136 return ret;
137 }
138
139 return 0;
140 }
141
142 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
143 {
144 int ret = 0;
145
146 if (chip->gpio_chip.ngpio <= 8)
147 ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
148 else if (chip->gpio_chip.ngpio >= 24) {
149 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
150 ret = i2c_smbus_write_i2c_block_data(chip->client,
151 (reg << bank_shift) | REG_ADDR_AI,
152 NBANK(chip), val);
153 } else {
154 switch (chip->chip_type) {
155 case PCA953X_TYPE:
156 ret = i2c_smbus_write_word_data(chip->client,
157 reg << 1, (u16) *val);
158 break;
159 case PCA957X_TYPE:
160 ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
161 val[0]);
162 if (ret < 0)
163 break;
164 ret = i2c_smbus_write_byte_data(chip->client,
165 (reg << 1) + 1,
166 val[1]);
167 break;
168 }
169 }
170
171 if (ret < 0) {
172 dev_err(&chip->client->dev, "failed writing register\n");
173 return ret;
174 }
175
176 return 0;
177 }
178
179 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
180 {
181 int ret;
182
183 if (chip->gpio_chip.ngpio <= 8) {
184 ret = i2c_smbus_read_byte_data(chip->client, reg);
185 *val = ret;
186 } else if (chip->gpio_chip.ngpio >= 24) {
187 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
188
189 ret = i2c_smbus_read_i2c_block_data(chip->client,
190 (reg << bank_shift) | REG_ADDR_AI,
191 NBANK(chip), val);
192 } else {
193 ret = i2c_smbus_read_word_data(chip->client, reg << 1);
194 val[0] = (u16)ret & 0xFF;
195 val[1] = (u16)ret >> 8;
196 }
197 if (ret < 0) {
198 dev_err(&chip->client->dev, "failed reading register\n");
199 return ret;
200 }
201
202 return 0;
203 }
204
205 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
206 {
207 struct pca953x_chip *chip = to_pca(gc);
208 u8 reg_val;
209 int ret, offset = 0;
210
211 mutex_lock(&chip->i2c_lock);
212 reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
213
214 switch (chip->chip_type) {
215 case PCA953X_TYPE:
216 offset = PCA953X_DIRECTION;
217 break;
218 case PCA957X_TYPE:
219 offset = PCA957X_CFG;
220 break;
221 }
222 ret = pca953x_write_single(chip, offset, reg_val, off);
223 if (ret)
224 goto exit;
225
226 chip->reg_direction[off / BANK_SZ] = reg_val;
227 ret = 0;
228 exit:
229 mutex_unlock(&chip->i2c_lock);
230 return ret;
231 }
232
233 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
234 unsigned off, int val)
235 {
236 struct pca953x_chip *chip = to_pca(gc);
237 u8 reg_val;
238 int ret, offset = 0;
239
240 mutex_lock(&chip->i2c_lock);
241 /* set output level */
242 if (val)
243 reg_val = chip->reg_output[off / BANK_SZ]
244 | (1u << (off % BANK_SZ));
245 else
246 reg_val = chip->reg_output[off / BANK_SZ]
247 & ~(1u << (off % BANK_SZ));
248
249 switch (chip->chip_type) {
250 case PCA953X_TYPE:
251 offset = PCA953X_OUTPUT;
252 break;
253 case PCA957X_TYPE:
254 offset = PCA957X_OUT;
255 break;
256 }
257 ret = pca953x_write_single(chip, offset, reg_val, off);
258 if (ret)
259 goto exit;
260
261 chip->reg_output[off / BANK_SZ] = reg_val;
262
263 /* then direction */
264 reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
265 switch (chip->chip_type) {
266 case PCA953X_TYPE:
267 offset = PCA953X_DIRECTION;
268 break;
269 case PCA957X_TYPE:
270 offset = PCA957X_CFG;
271 break;
272 }
273 ret = pca953x_write_single(chip, offset, reg_val, off);
274 if (ret)
275 goto exit;
276
277 chip->reg_direction[off / BANK_SZ] = reg_val;
278 ret = 0;
279 exit:
280 mutex_unlock(&chip->i2c_lock);
281 return ret;
282 }
283
284 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
285 {
286 struct pca953x_chip *chip = to_pca(gc);
287 u32 reg_val;
288 int ret, offset = 0;
289
290 mutex_lock(&chip->i2c_lock);
291 switch (chip->chip_type) {
292 case PCA953X_TYPE:
293 offset = PCA953X_INPUT;
294 break;
295 case PCA957X_TYPE:
296 offset = PCA957X_IN;
297 break;
298 }
299 ret = pca953x_read_single(chip, offset, &reg_val, off);
300 mutex_unlock(&chip->i2c_lock);
301 if (ret < 0) {
302 /* NOTE: diagnostic already emitted; that's all we should
303 * do unless gpio_*_value_cansleep() calls become different
304 * from their nonsleeping siblings (and report faults).
305 */
306 return 0;
307 }
308
309 return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
310 }
311
312 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
313 {
314 struct pca953x_chip *chip = to_pca(gc);
315 u8 reg_val;
316 int ret, offset = 0;
317
318 mutex_lock(&chip->i2c_lock);
319 if (val)
320 reg_val = chip->reg_output[off / BANK_SZ]
321 | (1u << (off % BANK_SZ));
322 else
323 reg_val = chip->reg_output[off / BANK_SZ]
324 & ~(1u << (off % BANK_SZ));
325
326 switch (chip->chip_type) {
327 case PCA953X_TYPE:
328 offset = PCA953X_OUTPUT;
329 break;
330 case PCA957X_TYPE:
331 offset = PCA957X_OUT;
332 break;
333 }
334 ret = pca953x_write_single(chip, offset, reg_val, off);
335 if (ret)
336 goto exit;
337
338 chip->reg_output[off / BANK_SZ] = reg_val;
339 exit:
340 mutex_unlock(&chip->i2c_lock);
341 }
342
343 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
344 {
345 struct gpio_chip *gc;
346
347 gc = &chip->gpio_chip;
348
349 gc->direction_input = pca953x_gpio_direction_input;
350 gc->direction_output = pca953x_gpio_direction_output;
351 gc->get = pca953x_gpio_get_value;
352 gc->set = pca953x_gpio_set_value;
353 gc->can_sleep = true;
354
355 gc->base = chip->gpio_start;
356 gc->ngpio = gpios;
357 gc->label = chip->client->name;
358 gc->dev = &chip->client->dev;
359 gc->owner = THIS_MODULE;
360 gc->names = chip->names;
361 }
362
363 #ifdef CONFIG_GPIO_PCA953X_IRQ
364 static void pca953x_irq_mask(struct irq_data *d)
365 {
366 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
367 struct pca953x_chip *chip = to_pca(gc);
368
369 chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
370 }
371
372 static void pca953x_irq_unmask(struct irq_data *d)
373 {
374 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
375 struct pca953x_chip *chip = to_pca(gc);
376
377 chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
378 }
379
380 static void pca953x_irq_bus_lock(struct irq_data *d)
381 {
382 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
383 struct pca953x_chip *chip = to_pca(gc);
384
385 mutex_lock(&chip->irq_lock);
386 }
387
388 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
389 {
390 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
391 struct pca953x_chip *chip = to_pca(gc);
392 u8 new_irqs;
393 int level, i;
394
395 /* Look for any newly setup interrupt */
396 for (i = 0; i < NBANK(chip); i++) {
397 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
398 new_irqs &= ~chip->reg_direction[i];
399
400 while (new_irqs) {
401 level = __ffs(new_irqs);
402 pca953x_gpio_direction_input(&chip->gpio_chip,
403 level + (BANK_SZ * i));
404 new_irqs &= ~(1 << level);
405 }
406 }
407
408 mutex_unlock(&chip->irq_lock);
409 }
410
411 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
412 {
413 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
414 struct pca953x_chip *chip = to_pca(gc);
415 int bank_nb = d->hwirq / BANK_SZ;
416 u8 mask = 1 << (d->hwirq % BANK_SZ);
417
418 if (!(type & IRQ_TYPE_EDGE_BOTH)) {
419 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
420 d->irq, type);
421 return -EINVAL;
422 }
423
424 if (type & IRQ_TYPE_EDGE_FALLING)
425 chip->irq_trig_fall[bank_nb] |= mask;
426 else
427 chip->irq_trig_fall[bank_nb] &= ~mask;
428
429 if (type & IRQ_TYPE_EDGE_RISING)
430 chip->irq_trig_raise[bank_nb] |= mask;
431 else
432 chip->irq_trig_raise[bank_nb] &= ~mask;
433
434 return 0;
435 }
436
437 static struct irq_chip pca953x_irq_chip = {
438 .name = "pca953x",
439 .irq_mask = pca953x_irq_mask,
440 .irq_unmask = pca953x_irq_unmask,
441 .irq_bus_lock = pca953x_irq_bus_lock,
442 .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
443 .irq_set_type = pca953x_irq_set_type,
444 };
445
446 static u8 pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
447 {
448 u8 cur_stat[MAX_BANK];
449 u8 old_stat[MAX_BANK];
450 u8 pendings = 0;
451 u8 trigger[MAX_BANK], triggers = 0;
452 int ret, i, offset = 0;
453
454 switch (chip->chip_type) {
455 case PCA953X_TYPE:
456 offset = PCA953X_INPUT;
457 break;
458 case PCA957X_TYPE:
459 offset = PCA957X_IN;
460 break;
461 }
462 ret = pca953x_read_regs(chip, offset, cur_stat);
463 if (ret)
464 return 0;
465
466 /* Remove output pins from the equation */
467 for (i = 0; i < NBANK(chip); i++)
468 cur_stat[i] &= chip->reg_direction[i];
469
470 memcpy(old_stat, chip->irq_stat, NBANK(chip));
471
472 for (i = 0; i < NBANK(chip); i++) {
473 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
474 triggers += trigger[i];
475 }
476
477 if (!triggers)
478 return 0;
479
480 memcpy(chip->irq_stat, cur_stat, NBANK(chip));
481
482 for (i = 0; i < NBANK(chip); i++) {
483 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
484 (cur_stat[i] & chip->irq_trig_raise[i]);
485 pending[i] &= trigger[i];
486 pendings += pending[i];
487 }
488
489 return pendings;
490 }
491
492 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
493 {
494 struct pca953x_chip *chip = devid;
495 u8 pending[MAX_BANK];
496 u8 level;
497 unsigned nhandled = 0;
498 int i;
499
500 if (!pca953x_irq_pending(chip, pending))
501 return IRQ_NONE;
502
503 for (i = 0; i < NBANK(chip); i++) {
504 while (pending[i]) {
505 level = __ffs(pending[i]);
506 handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
507 level + (BANK_SZ * i)));
508 pending[i] &= ~(1 << level);
509 nhandled++;
510 }
511 }
512
513 return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
514 }
515
516 static int pca953x_irq_setup(struct pca953x_chip *chip,
517 const struct i2c_device_id *id,
518 int irq_base)
519 {
520 struct i2c_client *client = chip->client;
521 int ret, i, offset = 0;
522
523 if (irq_base != -1
524 && (id->driver_data & PCA_INT)) {
525
526 switch (chip->chip_type) {
527 case PCA953X_TYPE:
528 offset = PCA953X_INPUT;
529 break;
530 case PCA957X_TYPE:
531 offset = PCA957X_IN;
532 break;
533 }
534 ret = pca953x_read_regs(chip, offset, chip->irq_stat);
535 if (ret)
536 return ret;
537
538 /*
539 * There is no way to know which GPIO line generated the
540 * interrupt. We have to rely on the previous read for
541 * this purpose.
542 */
543 for (i = 0; i < NBANK(chip); i++)
544 chip->irq_stat[i] &= chip->reg_direction[i];
545 mutex_init(&chip->irq_lock);
546
547 ret = devm_request_threaded_irq(&client->dev,
548 client->irq,
549 NULL,
550 pca953x_irq_handler,
551 IRQF_TRIGGER_LOW | IRQF_ONESHOT |
552 IRQF_SHARED,
553 dev_name(&client->dev), chip);
554 if (ret) {
555 dev_err(&client->dev, "failed to request irq %d\n",
556 client->irq);
557 return ret;
558 }
559
560 ret = gpiochip_irqchip_add(&chip->gpio_chip,
561 &pca953x_irq_chip,
562 irq_base,
563 handle_simple_irq,
564 IRQ_TYPE_NONE);
565 if (ret) {
566 dev_err(&client->dev,
567 "could not connect irqchip to gpiochip\n");
568 return ret;
569 }
570 }
571
572 return 0;
573 }
574
575 #else /* CONFIG_GPIO_PCA953X_IRQ */
576 static int pca953x_irq_setup(struct pca953x_chip *chip,
577 const struct i2c_device_id *id,
578 int irq_base)
579 {
580 struct i2c_client *client = chip->client;
581
582 if (irq_base != -1 && (id->driver_data & PCA_INT))
583 dev_warn(&client->dev, "interrupt support not compiled in\n");
584
585 return 0;
586 }
587 #endif
588
589 /*
590 * Handlers for alternative sources of platform_data
591 */
592 #ifdef CONFIG_OF_GPIO
593 /*
594 * Translate OpenFirmware node properties into platform_data
595 * WARNING: This is DEPRECATED and will be removed eventually!
596 */
597 static void
598 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
599 {
600 struct device_node *node;
601 const __be32 *val;
602 int size;
603
604 *gpio_base = -1;
605
606 node = client->dev.of_node;
607 if (node == NULL)
608 return;
609
610 val = of_get_property(node, "linux,gpio-base", &size);
611 WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__);
612 if (val) {
613 if (size != sizeof(*val))
614 dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
615 node->full_name);
616 else
617 *gpio_base = be32_to_cpup(val);
618 }
619
620 val = of_get_property(node, "polarity", NULL);
621 WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__);
622 if (val)
623 *invert = *val;
624 }
625 #else
626 static void
627 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
628 {
629 *gpio_base = -1;
630 }
631 #endif
632
633 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
634 {
635 int ret;
636 u8 val[MAX_BANK];
637
638 ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
639 if (ret)
640 goto out;
641
642 ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
643 chip->reg_direction);
644 if (ret)
645 goto out;
646
647 /* set platform specific polarity inversion */
648 if (invert)
649 memset(val, 0xFF, NBANK(chip));
650 else
651 memset(val, 0, NBANK(chip));
652
653 ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
654 out:
655 return ret;
656 }
657
658 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
659 {
660 int ret;
661 u8 val[MAX_BANK];
662
663 ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
664 if (ret)
665 goto out;
666 ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
667 if (ret)
668 goto out;
669
670 /* set platform specific polarity inversion */
671 if (invert)
672 memset(val, 0xFF, NBANK(chip));
673 else
674 memset(val, 0, NBANK(chip));
675 pca953x_write_regs(chip, PCA957X_INVRT, val);
676
677 /* To enable register 6, 7 to controll pull up and pull down */
678 memset(val, 0x02, NBANK(chip));
679 pca953x_write_regs(chip, PCA957X_BKEN, val);
680
681 return 0;
682 out:
683 return ret;
684 }
685
686 static int pca953x_probe(struct i2c_client *client,
687 const struct i2c_device_id *id)
688 {
689 struct pca953x_platform_data *pdata;
690 struct pca953x_chip *chip;
691 int irq_base = 0;
692 int ret;
693 u32 invert = 0;
694
695 chip = devm_kzalloc(&client->dev,
696 sizeof(struct pca953x_chip), GFP_KERNEL);
697 if (chip == NULL)
698 return -ENOMEM;
699
700 pdata = dev_get_platdata(&client->dev);
701 if (pdata) {
702 irq_base = pdata->irq_base;
703 chip->gpio_start = pdata->gpio_base;
704 invert = pdata->invert;
705 chip->names = pdata->names;
706 } else {
707 pca953x_get_alt_pdata(client, &chip->gpio_start, &invert);
708 #ifdef CONFIG_OF_GPIO
709 /* If I2C node has no interrupts property, disable GPIO interrupts */
710 if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL)
711 irq_base = -1;
712 #endif
713 }
714
715 chip->client = client;
716
717 chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
718
719 mutex_init(&chip->i2c_lock);
720
721 /* initialize cached registers from their original values.
722 * we can't share this chip with another i2c master.
723 */
724 pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
725
726 if (chip->chip_type == PCA953X_TYPE)
727 ret = device_pca953x_init(chip, invert);
728 else
729 ret = device_pca957x_init(chip, invert);
730 if (ret)
731 return ret;
732
733 ret = gpiochip_add(&chip->gpio_chip);
734 if (ret)
735 return ret;
736
737 ret = pca953x_irq_setup(chip, id, irq_base);
738 if (ret)
739 return ret;
740
741 if (pdata && pdata->setup) {
742 ret = pdata->setup(client, chip->gpio_chip.base,
743 chip->gpio_chip.ngpio, pdata->context);
744 if (ret < 0)
745 dev_warn(&client->dev, "setup failed, %d\n", ret);
746 }
747
748 i2c_set_clientdata(client, chip);
749 return 0;
750 }
751
752 static int pca953x_remove(struct i2c_client *client)
753 {
754 struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
755 struct pca953x_chip *chip = i2c_get_clientdata(client);
756 int ret = 0;
757
758 if (pdata && pdata->teardown) {
759 ret = pdata->teardown(client, chip->gpio_chip.base,
760 chip->gpio_chip.ngpio, pdata->context);
761 if (ret < 0) {
762 dev_err(&client->dev, "%s failed, %d\n",
763 "teardown", ret);
764 return ret;
765 }
766 }
767
768 ret = gpiochip_remove(&chip->gpio_chip);
769 if (ret) {
770 dev_err(&client->dev, "%s failed, %d\n",
771 "gpiochip_remove()", ret);
772 return ret;
773 }
774
775 return 0;
776 }
777
778 static const struct of_device_id pca953x_dt_ids[] = {
779 { .compatible = "nxp,pca9505", },
780 { .compatible = "nxp,pca9534", },
781 { .compatible = "nxp,pca9535", },
782 { .compatible = "nxp,pca9536", },
783 { .compatible = "nxp,pca9537", },
784 { .compatible = "nxp,pca9538", },
785 { .compatible = "nxp,pca9539", },
786 { .compatible = "nxp,pca9554", },
787 { .compatible = "nxp,pca9555", },
788 { .compatible = "nxp,pca9556", },
789 { .compatible = "nxp,pca9557", },
790 { .compatible = "nxp,pca9574", },
791 { .compatible = "nxp,pca9575", },
792 { .compatible = "nxp,pca9698", },
793
794 { .compatible = "maxim,max7310", },
795 { .compatible = "maxim,max7312", },
796 { .compatible = "maxim,max7313", },
797 { .compatible = "maxim,max7315", },
798
799 { .compatible = "ti,pca6107", },
800 { .compatible = "ti,tca6408", },
801 { .compatible = "ti,tca6416", },
802 { .compatible = "ti,tca6424", },
803
804 { .compatible = "exar,xra1202", },
805 { }
806 };
807
808 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
809
810 static struct i2c_driver pca953x_driver = {
811 .driver = {
812 .name = "pca953x",
813 .of_match_table = pca953x_dt_ids,
814 },
815 .probe = pca953x_probe,
816 .remove = pca953x_remove,
817 .id_table = pca953x_id,
818 };
819
820 static int __init pca953x_init(void)
821 {
822 return i2c_add_driver(&pca953x_driver);
823 }
824 /* register after i2c postcore initcall and before
825 * subsys initcalls that may rely on these GPIOs
826 */
827 subsys_initcall(pca953x_init);
828
829 static void __exit pca953x_exit(void)
830 {
831 i2c_del_driver(&pca953x_driver);
832 }
833 module_exit(pca953x_exit);
834
835 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
836 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
837 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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