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staging: comedi: dt9812: use CR_CHAN() for channel number
[deliverable/linux.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");
Linux kernel - Deliverables
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