Merge tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux
[~shefty/rdma-dev.git] / drivers / gpio / gpio-pca953x.c
1 /*
2  *  PCA953x 4/8/16 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/irq.h>
19 #include <linux/irqdomain.h>
20 #include <linux/i2c.h>
21 #include <linux/i2c/pca953x.h>
22 #include <linux/slab.h>
23 #ifdef CONFIG_OF_GPIO
24 #include <linux/of_platform.h>
25 #endif
26
27 #define PCA953X_INPUT           0
28 #define PCA953X_OUTPUT          1
29 #define PCA953X_INVERT          2
30 #define PCA953X_DIRECTION       3
31
32 #define REG_ADDR_AI             0x80
33
34 #define PCA957X_IN              0
35 #define PCA957X_INVRT           1
36 #define PCA957X_BKEN            2
37 #define PCA957X_PUPD            3
38 #define PCA957X_CFG             4
39 #define PCA957X_OUT             5
40 #define PCA957X_MSK             6
41 #define PCA957X_INTS            7
42
43 #define PCA_GPIO_MASK           0x00FF
44 #define PCA_INT                 0x0100
45 #define PCA953X_TYPE            0x1000
46 #define PCA957X_TYPE            0x2000
47
48 static const struct i2c_device_id pca953x_id[] = {
49         { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
50         { "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
51         { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
52         { "pca9536", 4  | PCA953X_TYPE, },
53         { "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
54         { "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
55         { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
56         { "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
57         { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
58         { "pca9556", 8  | PCA953X_TYPE, },
59         { "pca9557", 8  | PCA953X_TYPE, },
60         { "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
61         { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
62
63         { "max7310", 8  | PCA953X_TYPE, },
64         { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
65         { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
66         { "max7315", 8  | PCA953X_TYPE | PCA_INT, },
67         { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
68         { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
69         { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
70         { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
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         struct irq_domain *domain;
93 #endif
94
95         struct i2c_client *client;
96         struct gpio_chip gpio_chip;
97         const char *const *names;
98         int     chip_type;
99 };
100
101 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
102                                 int off)
103 {
104         int ret;
105         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
106         int offset = off / BANK_SZ;
107
108         ret = i2c_smbus_read_byte_data(chip->client,
109                                 (reg << bank_shift) + offset);
110         *val = ret;
111
112         if (ret < 0) {
113                 dev_err(&chip->client->dev, "failed reading register\n");
114                 return ret;
115         }
116
117         return 0;
118 }
119
120 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
121                                 int off)
122 {
123         int ret = 0;
124         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
125         int offset = off / BANK_SZ;
126
127         ret = i2c_smbus_write_byte_data(chip->client,
128                                         (reg << bank_shift) + offset, val);
129
130         if (ret < 0) {
131                 dev_err(&chip->client->dev, "failed writing register\n");
132                 return ret;
133         }
134
135         return 0;
136 }
137
138 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
139 {
140         int ret = 0;
141
142         if (chip->gpio_chip.ngpio <= 8)
143                 ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
144         else if (chip->gpio_chip.ngpio >= 24) {
145                 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
146                 ret = i2c_smbus_write_i2c_block_data(chip->client,
147                                         (reg << bank_shift) | REG_ADDR_AI,
148                                         NBANK(chip), val);
149         }
150         else {
151                 switch (chip->chip_type) {
152                 case PCA953X_TYPE:
153                         ret = i2c_smbus_write_word_data(chip->client,
154                                                         reg << 1, (u16) *val);
155                         break;
156                 case PCA957X_TYPE:
157                         ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
158                                                         val[0]);
159                         if (ret < 0)
160                                 break;
161                         ret = i2c_smbus_write_byte_data(chip->client,
162                                                         (reg << 1) + 1,
163                                                         val[1]);
164                         break;
165                 }
166         }
167
168         if (ret < 0) {
169                 dev_err(&chip->client->dev, "failed writing register\n");
170                 return ret;
171         }
172
173         return 0;
174 }
175
176 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
177 {
178         int ret;
179
180         if (chip->gpio_chip.ngpio <= 8) {
181                 ret = i2c_smbus_read_byte_data(chip->client, reg);
182                 *val = ret;
183         } else if (chip->gpio_chip.ngpio >= 24) {
184                 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
185
186                 ret = i2c_smbus_read_i2c_block_data(chip->client,
187                                         (reg << bank_shift) | REG_ADDR_AI,
188                                         NBANK(chip), val);
189         } else {
190                 ret = i2c_smbus_read_word_data(chip->client, reg << 1);
191                 val[0] = (u16)ret & 0xFF;
192                 val[1] = (u16)ret >> 8;
193         }
194         if (ret < 0) {
195                 dev_err(&chip->client->dev, "failed reading register\n");
196                 return ret;
197         }
198
199         return 0;
200 }
201
202 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
203 {
204         struct pca953x_chip *chip;
205         u8 reg_val;
206         int ret, offset = 0;
207
208         chip = container_of(gc, struct pca953x_chip, gpio_chip);
209
210         mutex_lock(&chip->i2c_lock);
211         reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
212
213         switch (chip->chip_type) {
214         case PCA953X_TYPE:
215                 offset = PCA953X_DIRECTION;
216                 break;
217         case PCA957X_TYPE:
218                 offset = PCA957X_CFG;
219                 break;
220         }
221         ret = pca953x_write_single(chip, offset, reg_val, off);
222         if (ret)
223                 goto exit;
224
225         chip->reg_direction[off / BANK_SZ] = reg_val;
226         ret = 0;
227 exit:
228         mutex_unlock(&chip->i2c_lock);
229         return ret;
230 }
231
232 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
233                 unsigned off, int val)
234 {
235         struct pca953x_chip *chip;
236         u8 reg_val;
237         int ret, offset = 0;
238
239         chip = container_of(gc, struct pca953x_chip, gpio_chip);
240
241         mutex_lock(&chip->i2c_lock);
242         /* set output level */
243         if (val)
244                 reg_val = chip->reg_output[off / BANK_SZ]
245                         | (1u << (off % BANK_SZ));
246         else
247                 reg_val = chip->reg_output[off / BANK_SZ]
248                         & ~(1u << (off % BANK_SZ));
249
250         switch (chip->chip_type) {
251         case PCA953X_TYPE:
252                 offset = PCA953X_OUTPUT;
253                 break;
254         case PCA957X_TYPE:
255                 offset = PCA957X_OUT;
256                 break;
257         }
258         ret = pca953x_write_single(chip, offset, reg_val, off);
259         if (ret)
260                 goto exit;
261
262         chip->reg_output[off / BANK_SZ] = reg_val;
263
264         /* then direction */
265         reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
266         switch (chip->chip_type) {
267         case PCA953X_TYPE:
268                 offset = PCA953X_DIRECTION;
269                 break;
270         case PCA957X_TYPE:
271                 offset = PCA957X_CFG;
272                 break;
273         }
274         ret = pca953x_write_single(chip, offset, reg_val, off);
275         if (ret)
276                 goto exit;
277
278         chip->reg_direction[off / BANK_SZ] = reg_val;
279         ret = 0;
280 exit:
281         mutex_unlock(&chip->i2c_lock);
282         return ret;
283 }
284
285 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
286 {
287         struct pca953x_chip *chip;
288         u32 reg_val;
289         int ret, offset = 0;
290
291         chip = container_of(gc, struct pca953x_chip, gpio_chip);
292
293         mutex_lock(&chip->i2c_lock);
294         switch (chip->chip_type) {
295         case PCA953X_TYPE:
296                 offset = PCA953X_INPUT;
297                 break;
298         case PCA957X_TYPE:
299                 offset = PCA957X_IN;
300                 break;
301         }
302         ret = pca953x_read_single(chip, offset, &reg_val, off);
303         mutex_unlock(&chip->i2c_lock);
304         if (ret < 0) {
305                 /* NOTE:  diagnostic already emitted; that's all we should
306                  * do unless gpio_*_value_cansleep() calls become different
307                  * from their nonsleeping siblings (and report faults).
308                  */
309                 return 0;
310         }
311
312         return (reg_val & (1u << off)) ? 1 : 0;
313 }
314
315 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
316 {
317         struct pca953x_chip *chip;
318         u8 reg_val;
319         int ret, offset = 0;
320
321         chip = container_of(gc, struct pca953x_chip, gpio_chip);
322
323         mutex_lock(&chip->i2c_lock);
324         if (val)
325                 reg_val = chip->reg_output[off / BANK_SZ]
326                         | (1u << (off % BANK_SZ));
327         else
328                 reg_val = chip->reg_output[off / BANK_SZ]
329                         & ~(1u << (off % BANK_SZ));
330
331         switch (chip->chip_type) {
332         case PCA953X_TYPE:
333                 offset = PCA953X_OUTPUT;
334                 break;
335         case PCA957X_TYPE:
336                 offset = PCA957X_OUT;
337                 break;
338         }
339         ret = pca953x_write_single(chip, offset, reg_val, off);
340         if (ret)
341                 goto exit;
342
343         chip->reg_output[off / BANK_SZ] = reg_val;
344 exit:
345         mutex_unlock(&chip->i2c_lock);
346 }
347
348 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
349 {
350         struct gpio_chip *gc;
351
352         gc = &chip->gpio_chip;
353
354         gc->direction_input  = pca953x_gpio_direction_input;
355         gc->direction_output = pca953x_gpio_direction_output;
356         gc->get = pca953x_gpio_get_value;
357         gc->set = pca953x_gpio_set_value;
358         gc->can_sleep = 1;
359
360         gc->base = chip->gpio_start;
361         gc->ngpio = gpios;
362         gc->label = chip->client->name;
363         gc->dev = &chip->client->dev;
364         gc->owner = THIS_MODULE;
365         gc->names = chip->names;
366 }
367
368 #ifdef CONFIG_GPIO_PCA953X_IRQ
369 static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off)
370 {
371         struct pca953x_chip *chip;
372
373         chip = container_of(gc, struct pca953x_chip, gpio_chip);
374         return irq_create_mapping(chip->domain, off);
375 }
376
377 static void pca953x_irq_mask(struct irq_data *d)
378 {
379         struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
380
381         chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
382 }
383
384 static void pca953x_irq_unmask(struct irq_data *d)
385 {
386         struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
387
388         chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
389 }
390
391 static void pca953x_irq_bus_lock(struct irq_data *d)
392 {
393         struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
394
395         mutex_lock(&chip->irq_lock);
396 }
397
398 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
399 {
400         struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
401         u8 new_irqs;
402         int level, i;
403
404         /* Look for any newly setup interrupt */
405         for (i = 0; i < NBANK(chip); i++) {
406                 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
407                 new_irqs &= ~chip->reg_direction[i];
408
409                 while (new_irqs) {
410                         level = __ffs(new_irqs);
411                         pca953x_gpio_direction_input(&chip->gpio_chip,
412                                                         level + (BANK_SZ * i));
413                         new_irqs &= ~(1 << level);
414                 }
415         }
416
417         mutex_unlock(&chip->irq_lock);
418 }
419
420 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
421 {
422         struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
423         int bank_nb = d->hwirq / BANK_SZ;
424         u8 mask = 1 << (d->hwirq % BANK_SZ);
425
426         if (!(type & IRQ_TYPE_EDGE_BOTH)) {
427                 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
428                         d->irq, type);
429                 return -EINVAL;
430         }
431
432         if (type & IRQ_TYPE_EDGE_FALLING)
433                 chip->irq_trig_fall[bank_nb] |= mask;
434         else
435                 chip->irq_trig_fall[bank_nb] &= ~mask;
436
437         if (type & IRQ_TYPE_EDGE_RISING)
438                 chip->irq_trig_raise[bank_nb] |= mask;
439         else
440                 chip->irq_trig_raise[bank_nb] &= ~mask;
441
442         return 0;
443 }
444
445 static struct irq_chip pca953x_irq_chip = {
446         .name                   = "pca953x",
447         .irq_mask               = pca953x_irq_mask,
448         .irq_unmask             = pca953x_irq_unmask,
449         .irq_bus_lock           = pca953x_irq_bus_lock,
450         .irq_bus_sync_unlock    = pca953x_irq_bus_sync_unlock,
451         .irq_set_type           = pca953x_irq_set_type,
452 };
453
454 static u8 pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
455 {
456         u8 cur_stat[MAX_BANK];
457         u8 old_stat[MAX_BANK];
458         u8 pendings = 0;
459         u8 trigger[MAX_BANK], triggers = 0;
460         int ret, i, offset = 0;
461
462         switch (chip->chip_type) {
463         case PCA953X_TYPE:
464                 offset = PCA953X_INPUT;
465                 break;
466         case PCA957X_TYPE:
467                 offset = PCA957X_IN;
468                 break;
469         }
470         ret = pca953x_read_regs(chip, offset, cur_stat);
471         if (ret)
472                 return 0;
473
474         /* Remove output pins from the equation */
475         for (i = 0; i < NBANK(chip); i++)
476                 cur_stat[i] &= chip->reg_direction[i];
477
478         memcpy(old_stat, chip->irq_stat, NBANK(chip));
479
480         for (i = 0; i < NBANK(chip); i++) {
481                 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
482                 triggers += trigger[i];
483         }
484
485         if (!triggers)
486                 return 0;
487
488         memcpy(chip->irq_stat, cur_stat, NBANK(chip));
489
490         for (i = 0; i < NBANK(chip); i++) {
491                 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
492                         (cur_stat[i] & chip->irq_trig_raise[i]);
493                 pending[i] &= trigger[i];
494                 pendings += pending[i];
495         }
496
497         return pendings;
498 }
499
500 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
501 {
502         struct pca953x_chip *chip = devid;
503         u8 pending[MAX_BANK];
504         u8 level;
505         int i;
506
507         if (!pca953x_irq_pending(chip, pending))
508                 return IRQ_HANDLED;
509
510         for (i = 0; i < NBANK(chip); i++) {
511                 while (pending[i]) {
512                         level = __ffs(pending[i]);
513                         handle_nested_irq(irq_find_mapping(chip->domain,
514                                                         level + (BANK_SZ * i)));
515                         pending[i] &= ~(1 << level);
516                 }
517         }
518
519         return IRQ_HANDLED;
520 }
521
522 static int pca953x_gpio_irq_map(struct irq_domain *d, unsigned int irq,
523                        irq_hw_number_t hwirq)
524 {
525         irq_clear_status_flags(irq, IRQ_NOREQUEST);
526         irq_set_chip_data(irq, d->host_data);
527         irq_set_chip(irq, &pca953x_irq_chip);
528         irq_set_nested_thread(irq, true);
529 #ifdef CONFIG_ARM
530         set_irq_flags(irq, IRQF_VALID);
531 #else
532         irq_set_noprobe(irq);
533 #endif
534
535         return 0;
536 }
537
538 static const struct irq_domain_ops pca953x_irq_simple_ops = {
539         .map = pca953x_gpio_irq_map,
540         .xlate = irq_domain_xlate_twocell,
541 };
542
543 static int pca953x_irq_setup(struct pca953x_chip *chip,
544                              const struct i2c_device_id *id,
545                              int irq_base)
546 {
547         struct i2c_client *client = chip->client;
548         int ret, i, offset = 0;
549
550         if (irq_base != -1
551                         && (id->driver_data & PCA_INT)) {
552
553                 switch (chip->chip_type) {
554                 case PCA953X_TYPE:
555                         offset = PCA953X_INPUT;
556                         break;
557                 case PCA957X_TYPE:
558                         offset = PCA957X_IN;
559                         break;
560                 }
561                 ret = pca953x_read_regs(chip, offset, chip->irq_stat);
562                 if (ret)
563                         return ret;
564
565                 /*
566                  * There is no way to know which GPIO line generated the
567                  * interrupt.  We have to rely on the previous read for
568                  * this purpose.
569                  */
570                 for (i = 0; i < NBANK(chip); i++)
571                         chip->irq_stat[i] &= chip->reg_direction[i];
572                 mutex_init(&chip->irq_lock);
573
574                 chip->domain = irq_domain_add_simple(client->dev.of_node,
575                                                 chip->gpio_chip.ngpio,
576                                                 irq_base,
577                                                 &pca953x_irq_simple_ops,
578                                                 NULL);
579                 if (!chip->domain)
580                         return -ENODEV;
581
582                 ret = devm_request_threaded_irq(&client->dev,
583                                         client->irq,
584                                            NULL,
585                                            pca953x_irq_handler,
586                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT,
587                                            dev_name(&client->dev), chip);
588                 if (ret) {
589                         dev_err(&client->dev, "failed to request irq %d\n",
590                                 client->irq);
591                         return ret;
592                 }
593
594                 chip->gpio_chip.to_irq = pca953x_gpio_to_irq;
595         }
596
597         return 0;
598 }
599
600 #else /* CONFIG_GPIO_PCA953X_IRQ */
601 static int pca953x_irq_setup(struct pca953x_chip *chip,
602                              const struct i2c_device_id *id,
603                              int irq_base)
604 {
605         struct i2c_client *client = chip->client;
606
607         if (irq_base != -1 && (id->driver_data & PCA_INT))
608                 dev_warn(&client->dev, "interrupt support not compiled in\n");
609
610         return 0;
611 }
612 #endif
613
614 /*
615  * Handlers for alternative sources of platform_data
616  */
617 #ifdef CONFIG_OF_GPIO
618 /*
619  * Translate OpenFirmware node properties into platform_data
620  * WARNING: This is DEPRECATED and will be removed eventually!
621  */
622 static void
623 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
624 {
625         struct device_node *node;
626         const __be32 *val;
627         int size;
628
629         node = client->dev.of_node;
630         if (node == NULL)
631                 return;
632
633         *gpio_base = -1;
634         val = of_get_property(node, "linux,gpio-base", &size);
635         WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__);
636         if (val) {
637                 if (size != sizeof(*val))
638                         dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
639                                  node->full_name);
640                 else
641                         *gpio_base = be32_to_cpup(val);
642         }
643
644         val = of_get_property(node, "polarity", NULL);
645         WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__);
646         if (val)
647                 *invert = *val;
648 }
649 #else
650 static void
651 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
652 {
653         *gpio_base = -1;
654 }
655 #endif
656
657 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
658 {
659         int ret;
660         u8 val[MAX_BANK];
661
662         ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
663         if (ret)
664                 goto out;
665
666         ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
667                                chip->reg_direction);
668         if (ret)
669                 goto out;
670
671         /* set platform specific polarity inversion */
672         if (invert)
673                 memset(val, 0xFF, NBANK(chip));
674         else
675                 memset(val, 0, NBANK(chip));
676
677         ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
678 out:
679         return ret;
680 }
681
682 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
683 {
684         int ret;
685         u8 val[MAX_BANK];
686
687         /* Let every port in proper state, that could save power */
688         memset(val, 0, NBANK(chip));
689         pca953x_write_regs(chip, PCA957X_PUPD, val);
690         memset(val, 0xFF, NBANK(chip));
691         pca953x_write_regs(chip, PCA957X_CFG, val);
692         memset(val, 0, NBANK(chip));
693         pca953x_write_regs(chip, PCA957X_OUT, val);
694
695         ret = pca953x_read_regs(chip, PCA957X_IN, val);
696         if (ret)
697                 goto out;
698         ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
699         if (ret)
700                 goto out;
701         ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
702         if (ret)
703                 goto out;
704
705         /* set platform specific polarity inversion */
706         if (invert)
707                 memset(val, 0xFF, NBANK(chip));
708         else
709                 memset(val, 0, NBANK(chip));
710         pca953x_write_regs(chip, PCA957X_INVRT, val);
711
712         /* To enable register 6, 7 to controll pull up and pull down */
713         memset(val, 0x02, NBANK(chip));
714         pca953x_write_regs(chip, PCA957X_BKEN, val);
715
716         return 0;
717 out:
718         return ret;
719 }
720
721 static int pca953x_probe(struct i2c_client *client,
722                                    const struct i2c_device_id *id)
723 {
724         struct pca953x_platform_data *pdata;
725         struct pca953x_chip *chip;
726         int irq_base = 0;
727         int ret;
728         u32 invert = 0;
729
730         chip = devm_kzalloc(&client->dev,
731                         sizeof(struct pca953x_chip), GFP_KERNEL);
732         if (chip == NULL)
733                 return -ENOMEM;
734
735         pdata = client->dev.platform_data;
736         if (pdata) {
737                 irq_base = pdata->irq_base;
738                 chip->gpio_start = pdata->gpio_base;
739                 invert = pdata->invert;
740                 chip->names = pdata->names;
741         } else {
742                 pca953x_get_alt_pdata(client, &chip->gpio_start, &invert);
743 #ifdef CONFIG_OF_GPIO
744                 /* If I2C node has no interrupts property, disable GPIO interrupts */
745                 if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL)
746                         irq_base = -1;
747 #endif
748         }
749
750         chip->client = client;
751
752         chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
753
754         mutex_init(&chip->i2c_lock);
755
756         /* initialize cached registers from their original values.
757          * we can't share this chip with another i2c master.
758          */
759         pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
760
761         if (chip->chip_type == PCA953X_TYPE)
762                 ret = device_pca953x_init(chip, invert);
763         else
764                 ret = device_pca957x_init(chip, invert);
765         if (ret)
766                 return ret;
767
768         ret = pca953x_irq_setup(chip, id, irq_base);
769         if (ret)
770                 return ret;
771
772         ret = gpiochip_add(&chip->gpio_chip);
773         if (ret)
774                 return ret;
775
776         if (pdata && pdata->setup) {
777                 ret = pdata->setup(client, chip->gpio_chip.base,
778                                 chip->gpio_chip.ngpio, pdata->context);
779                 if (ret < 0)
780                         dev_warn(&client->dev, "setup failed, %d\n", ret);
781         }
782
783         i2c_set_clientdata(client, chip);
784         return 0;
785 }
786
787 static int pca953x_remove(struct i2c_client *client)
788 {
789         struct pca953x_platform_data *pdata = client->dev.platform_data;
790         struct pca953x_chip *chip = i2c_get_clientdata(client);
791         int ret = 0;
792
793         if (pdata && pdata->teardown) {
794                 ret = pdata->teardown(client, chip->gpio_chip.base,
795                                 chip->gpio_chip.ngpio, pdata->context);
796                 if (ret < 0) {
797                         dev_err(&client->dev, "%s failed, %d\n",
798                                         "teardown", ret);
799                         return ret;
800                 }
801         }
802
803         ret = gpiochip_remove(&chip->gpio_chip);
804         if (ret) {
805                 dev_err(&client->dev, "%s failed, %d\n",
806                                 "gpiochip_remove()", ret);
807                 return ret;
808         }
809
810         return 0;
811 }
812
813 static const struct of_device_id pca953x_dt_ids[] = {
814         { .compatible = "nxp,pca9505", },
815         { .compatible = "nxp,pca9534", },
816         { .compatible = "nxp,pca9535", },
817         { .compatible = "nxp,pca9536", },
818         { .compatible = "nxp,pca9537", },
819         { .compatible = "nxp,pca9538", },
820         { .compatible = "nxp,pca9539", },
821         { .compatible = "nxp,pca9554", },
822         { .compatible = "nxp,pca9555", },
823         { .compatible = "nxp,pca9556", },
824         { .compatible = "nxp,pca9557", },
825         { .compatible = "nxp,pca9574", },
826         { .compatible = "nxp,pca9575", },
827
828         { .compatible = "maxim,max7310", },
829         { .compatible = "maxim,max7312", },
830         { .compatible = "maxim,max7313", },
831         { .compatible = "maxim,max7315", },
832
833         { .compatible = "ti,pca6107", },
834         { .compatible = "ti,tca6408", },
835         { .compatible = "ti,tca6416", },
836         { .compatible = "ti,tca6424", },
837         { }
838 };
839
840 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
841
842 static struct i2c_driver pca953x_driver = {
843         .driver = {
844                 .name   = "pca953x",
845                 .of_match_table = pca953x_dt_ids,
846         },
847         .probe          = pca953x_probe,
848         .remove         = pca953x_remove,
849         .id_table       = pca953x_id,
850 };
851
852 static int __init pca953x_init(void)
853 {
854         return i2c_add_driver(&pca953x_driver);
855 }
856 /* register after i2c postcore initcall and before
857  * subsys initcalls that may rely on these GPIOs
858  */
859 subsys_initcall(pca953x_init);
860
861 static void __exit pca953x_exit(void)
862 {
863         i2c_del_driver(&pca953x_driver);
864 }
865 module_exit(pca953x_exit);
866
867 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
868 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
869 MODULE_LICENSE("GPL");