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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/irq.h>
19#include <linux/irqdomain.h>
20#include <linux/i2c.h>
21#include <linux/platform_data/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
48static 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 { "pca9698", 40 | PCA953X_TYPE, },
63
64 { "max7310", 8 | PCA953X_TYPE, },
65 { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
66 { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
67 { "max7315", 8 | PCA953X_TYPE | PCA_INT, },
68 { "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
69 { "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
70 { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
71 { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
72 { "xra1202", 8 | PCA953X_TYPE },
73 { }
74};
75MODULE_DEVICE_TABLE(i2c, pca953x_id);
76
77#define MAX_BANK 5
78#define BANK_SZ 8
79
80#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
81
82struct pca953x_chip {
83 unsigned gpio_start;
84 u8 reg_output[MAX_BANK];
85 u8 reg_direction[MAX_BANK];
86 struct mutex i2c_lock;
87
88#ifdef CONFIG_GPIO_PCA953X_IRQ
89 struct mutex irq_lock;
90 u8 irq_mask[MAX_BANK];
91 u8 irq_stat[MAX_BANK];
92 u8 irq_trig_raise[MAX_BANK];
93 u8 irq_trig_fall[MAX_BANK];
94 struct irq_domain *domain;
95#endif
96
97 struct i2c_client *client;
98 struct gpio_chip gpio_chip;
99 const char *const *names;
100 int chip_type;
101};
102
103static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
104 int off)
105{
106 int ret;
107 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
108 int offset = off / BANK_SZ;
109
110 ret = i2c_smbus_read_byte_data(chip->client,
111 (reg << bank_shift) + offset);
112 *val = ret;
113
114 if (ret < 0) {
115 dev_err(&chip->client->dev, "failed reading register\n");
116 return ret;
117 }
118
119 return 0;
120}
121
122static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
123 int off)
124{
125 int ret = 0;
126 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
127 int offset = off / BANK_SZ;
128
129 ret = i2c_smbus_write_byte_data(chip->client,
130 (reg << bank_shift) + offset, val);
131
132 if (ret < 0) {
133 dev_err(&chip->client->dev, "failed writing register\n");
134 return ret;
135 }
136
137 return 0;
138}
139
140static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
141{
142 int ret = 0;
143
144 if (chip->gpio_chip.ngpio <= 8)
145 ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
146 else if (chip->gpio_chip.ngpio >= 24) {
147 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
148 ret = i2c_smbus_write_i2c_block_data(chip->client,
149 (reg << bank_shift) | REG_ADDR_AI,
150 NBANK(chip), val);
151 } else {
152 switch (chip->chip_type) {
153 case PCA953X_TYPE:
154 ret = i2c_smbus_write_word_data(chip->client,
155 reg << 1, (u16) *val);
156 break;
157 case PCA957X_TYPE:
158 ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
159 val[0]);
160 if (ret < 0)
161 break;
162 ret = i2c_smbus_write_byte_data(chip->client,
163 (reg << 1) + 1,
164 val[1]);
165 break;
166 }
167 }
168
169 if (ret < 0) {
170 dev_err(&chip->client->dev, "failed writing register\n");
171 return ret;
172 }
173
174 return 0;
175}
176
177static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
178{
179 int ret;
180
181 if (chip->gpio_chip.ngpio <= 8) {
182 ret = i2c_smbus_read_byte_data(chip->client, reg);
183 *val = ret;
184 } else if (chip->gpio_chip.ngpio >= 24) {
185 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
186
187 ret = i2c_smbus_read_i2c_block_data(chip->client,
188 (reg << bank_shift) | REG_ADDR_AI,
189 NBANK(chip), val);
190 } else {
191 ret = i2c_smbus_read_word_data(chip->client, reg << 1);
192 val[0] = (u16)ret & 0xFF;
193 val[1] = (u16)ret >> 8;
194 }
195 if (ret < 0) {
196 dev_err(&chip->client->dev, "failed reading register\n");
197 return ret;
198 }
199
200 return 0;
201}
202
203static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
204{
205 struct pca953x_chip *chip;
206 u8 reg_val;
207 int ret, offset = 0;
208
209 chip = container_of(gc, struct pca953x_chip, gpio_chip);
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;
228exit:
229 mutex_unlock(&chip->i2c_lock);
230 return ret;
231}
232
233static int pca953x_gpio_direction_output(struct gpio_chip *gc,
234 unsigned off, int val)
235{
236 struct pca953x_chip *chip;
237 u8 reg_val;
238 int ret, offset = 0;
239
240 chip = container_of(gc, struct pca953x_chip, gpio_chip);
241
242 mutex_lock(&chip->i2c_lock);
243 /* set output level */
244 if (val)
245 reg_val = chip->reg_output[off / BANK_SZ]
246 | (1u << (off % BANK_SZ));
247 else
248 reg_val = chip->reg_output[off / BANK_SZ]
249 & ~(1u << (off % BANK_SZ));
250
251 switch (chip->chip_type) {
252 case PCA953X_TYPE:
253 offset = PCA953X_OUTPUT;
254 break;
255 case PCA957X_TYPE:
256 offset = PCA957X_OUT;
257 break;
258 }
259 ret = pca953x_write_single(chip, offset, reg_val, off);
260 if (ret)
261 goto exit;
262
263 chip->reg_output[off / BANK_SZ] = reg_val;
264
265 /* then direction */
266 reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
267 switch (chip->chip_type) {
268 case PCA953X_TYPE:
269 offset = PCA953X_DIRECTION;
270 break;
271 case PCA957X_TYPE:
272 offset = PCA957X_CFG;
273 break;
274 }
275 ret = pca953x_write_single(chip, offset, reg_val, off);
276 if (ret)
277 goto exit;
278
279 chip->reg_direction[off / BANK_SZ] = reg_val;
280 ret = 0;
281exit:
282 mutex_unlock(&chip->i2c_lock);
283 return ret;
284}
285
286static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
287{
288 struct pca953x_chip *chip;
289 u32 reg_val;
290 int ret, offset = 0;
291
292 chip = container_of(gc, struct pca953x_chip, gpio_chip);
293
294 mutex_lock(&chip->i2c_lock);
295 switch (chip->chip_type) {
296 case PCA953X_TYPE:
297 offset = PCA953X_INPUT;
298 break;
299 case PCA957X_TYPE:
300 offset = PCA957X_IN;
301 break;
302 }
303 ret = pca953x_read_single(chip, offset, ®_val, off);
304 mutex_unlock(&chip->i2c_lock);
305 if (ret < 0) {
306 /* NOTE: diagnostic already emitted; that's all we should
307 * do unless gpio_*_value_cansleep() calls become different
308 * from their nonsleeping siblings (and report faults).
309 */
310 return 0;
311 }
312
313 return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
314}
315
316static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
317{
318 struct pca953x_chip *chip;
319 u8 reg_val;
320 int ret, offset = 0;
321
322 chip = container_of(gc, struct pca953x_chip, gpio_chip);
323
324 mutex_lock(&chip->i2c_lock);
325 if (val)
326 reg_val = chip->reg_output[off / BANK_SZ]
327 | (1u << (off % BANK_SZ));
328 else
329 reg_val = chip->reg_output[off / BANK_SZ]
330 & ~(1u << (off % BANK_SZ));
331
332 switch (chip->chip_type) {
333 case PCA953X_TYPE:
334 offset = PCA953X_OUTPUT;
335 break;
336 case PCA957X_TYPE:
337 offset = PCA957X_OUT;
338 break;
339 }
340 ret = pca953x_write_single(chip, offset, reg_val, off);
341 if (ret)
342 goto exit;
343
344 chip->reg_output[off / BANK_SZ] = reg_val;
345exit:
346 mutex_unlock(&chip->i2c_lock);
347}
348
349static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
350{
351 struct gpio_chip *gc;
352
353 gc = &chip->gpio_chip;
354
355 gc->direction_input = pca953x_gpio_direction_input;
356 gc->direction_output = pca953x_gpio_direction_output;
357 gc->get = pca953x_gpio_get_value;
358 gc->set = pca953x_gpio_set_value;
359 gc->can_sleep = true;
360
361 gc->base = chip->gpio_start;
362 gc->ngpio = gpios;
363 gc->label = chip->client->name;
364 gc->dev = &chip->client->dev;
365 gc->owner = THIS_MODULE;
366 gc->names = chip->names;
367}
368
369#ifdef CONFIG_GPIO_PCA953X_IRQ
370static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off)
371{
372 struct pca953x_chip *chip;
373
374 chip = container_of(gc, struct pca953x_chip, gpio_chip);
375 return irq_create_mapping(chip->domain, off);
376}
377
378static void pca953x_irq_mask(struct irq_data *d)
379{
380 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
381
382 chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
383}
384
385static void pca953x_irq_unmask(struct irq_data *d)
386{
387 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
388
389 chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
390}
391
392static void pca953x_irq_bus_lock(struct irq_data *d)
393{
394 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
395
396 mutex_lock(&chip->irq_lock);
397}
398
399static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
400{
401 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
402 u8 new_irqs;
403 int level, i;
404
405 /* Look for any newly setup interrupt */
406 for (i = 0; i < NBANK(chip); i++) {
407 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
408 new_irqs &= ~chip->reg_direction[i];
409
410 while (new_irqs) {
411 level = __ffs(new_irqs);
412 pca953x_gpio_direction_input(&chip->gpio_chip,
413 level + (BANK_SZ * i));
414 new_irqs &= ~(1 << level);
415 }
416 }
417
418 mutex_unlock(&chip->irq_lock);
419}
420
421static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
422{
423 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
424 int bank_nb = d->hwirq / BANK_SZ;
425 u8 mask = 1 << (d->hwirq % BANK_SZ);
426
427 if (!(type & IRQ_TYPE_EDGE_BOTH)) {
428 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
429 d->irq, type);
430 return -EINVAL;
431 }
432
433 if (type & IRQ_TYPE_EDGE_FALLING)
434 chip->irq_trig_fall[bank_nb] |= mask;
435 else
436 chip->irq_trig_fall[bank_nb] &= ~mask;
437
438 if (type & IRQ_TYPE_EDGE_RISING)
439 chip->irq_trig_raise[bank_nb] |= mask;
440 else
441 chip->irq_trig_raise[bank_nb] &= ~mask;
442
443 return 0;
444}
445
446static struct irq_chip pca953x_irq_chip = {
447 .name = "pca953x",
448 .irq_mask = pca953x_irq_mask,
449 .irq_unmask = pca953x_irq_unmask,
450 .irq_bus_lock = pca953x_irq_bus_lock,
451 .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
452 .irq_set_type = pca953x_irq_set_type,
453};
454
455static u8 pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
456{
457 u8 cur_stat[MAX_BANK];
458 u8 old_stat[MAX_BANK];
459 u8 pendings = 0;
460 u8 trigger[MAX_BANK], triggers = 0;
461 int ret, i, offset = 0;
462
463 switch (chip->chip_type) {
464 case PCA953X_TYPE:
465 offset = PCA953X_INPUT;
466 break;
467 case PCA957X_TYPE:
468 offset = PCA957X_IN;
469 break;
470 }
471 ret = pca953x_read_regs(chip, offset, cur_stat);
472 if (ret)
473 return 0;
474
475 /* Remove output pins from the equation */
476 for (i = 0; i < NBANK(chip); i++)
477 cur_stat[i] &= chip->reg_direction[i];
478
479 memcpy(old_stat, chip->irq_stat, NBANK(chip));
480
481 for (i = 0; i < NBANK(chip); i++) {
482 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
483 triggers += trigger[i];
484 }
485
486 if (!triggers)
487 return 0;
488
489 memcpy(chip->irq_stat, cur_stat, NBANK(chip));
490
491 for (i = 0; i < NBANK(chip); i++) {
492 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
493 (cur_stat[i] & chip->irq_trig_raise[i]);
494 pending[i] &= trigger[i];
495 pendings += pending[i];
496 }
497
498 return pendings;
499}
500
501static irqreturn_t pca953x_irq_handler(int irq, void *devid)
502{
503 struct pca953x_chip *chip = devid;
504 u8 pending[MAX_BANK];
505 u8 level;
506 int i;
507
508 if (!pca953x_irq_pending(chip, pending))
509 return IRQ_HANDLED;
510
511 for (i = 0; i < NBANK(chip); i++) {
512 while (pending[i]) {
513 level = __ffs(pending[i]);
514 handle_nested_irq(irq_find_mapping(chip->domain,
515 level + (BANK_SZ * i)));
516 pending[i] &= ~(1 << level);
517 }
518 }
519
520 return IRQ_HANDLED;
521}
522
523static int pca953x_gpio_irq_map(struct irq_domain *d, unsigned int irq,
524 irq_hw_number_t hwirq)
525{
526 irq_clear_status_flags(irq, IRQ_NOREQUEST);
527 irq_set_chip_data(irq, d->host_data);
528 irq_set_chip(irq, &pca953x_irq_chip);
529 irq_set_nested_thread(irq, true);
530#ifdef CONFIG_ARM
531 set_irq_flags(irq, IRQF_VALID);
532#else
533 irq_set_noprobe(irq);
534#endif
535
536 return 0;
537}
538
539static const struct irq_domain_ops pca953x_irq_simple_ops = {
540 .map = pca953x_gpio_irq_map,
541 .xlate = irq_domain_xlate_twocell,
542};
543
544static int pca953x_irq_setup(struct pca953x_chip *chip,
545 const struct i2c_device_id *id,
546 int irq_base)
547{
548 struct i2c_client *client = chip->client;
549 int ret, i, offset = 0;
550
551 if (irq_base != -1
552 && (id->driver_data & PCA_INT)) {
553
554 switch (chip->chip_type) {
555 case PCA953X_TYPE:
556 offset = PCA953X_INPUT;
557 break;
558 case PCA957X_TYPE:
559 offset = PCA957X_IN;
560 break;
561 }
562 ret = pca953x_read_regs(chip, offset, chip->irq_stat);
563 if (ret)
564 return ret;
565
566 /*
567 * There is no way to know which GPIO line generated the
568 * interrupt. We have to rely on the previous read for
569 * this purpose.
570 */
571 for (i = 0; i < NBANK(chip); i++)
572 chip->irq_stat[i] &= chip->reg_direction[i];
573 mutex_init(&chip->irq_lock);
574
575 chip->domain = irq_domain_add_simple(client->dev.of_node,
576 chip->gpio_chip.ngpio,
577 irq_base,
578 &pca953x_irq_simple_ops,
579 chip);
580 if (!chip->domain)
581 return -ENODEV;
582
583 ret = devm_request_threaded_irq(&client->dev,
584 client->irq,
585 NULL,
586 pca953x_irq_handler,
587 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
588 dev_name(&client->dev), chip);
589 if (ret) {
590 dev_err(&client->dev, "failed to request irq %d\n",
591 client->irq);
592 return ret;
593 }
594
595 chip->gpio_chip.to_irq = pca953x_gpio_to_irq;
596 }
597
598 return 0;
599}
600
601#else /* CONFIG_GPIO_PCA953X_IRQ */
602static int pca953x_irq_setup(struct pca953x_chip *chip,
603 const struct i2c_device_id *id,
604 int irq_base)
605{
606 struct i2c_client *client = chip->client;
607
608 if (irq_base != -1 && (id->driver_data & PCA_INT))
609 dev_warn(&client->dev, "interrupt support not compiled in\n");
610
611 return 0;
612}
613#endif
614
615/*
616 * Handlers for alternative sources of platform_data
617 */
618#ifdef CONFIG_OF_GPIO
619/*
620 * Translate OpenFirmware node properties into platform_data
621 * WARNING: This is DEPRECATED and will be removed eventually!
622 */
623static void
624pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
625{
626 struct device_node *node;
627 const __be32 *val;
628 int size;
629
630 *gpio_base = -1;
631
632 node = client->dev.of_node;
633 if (node == NULL)
634 return;
635
636 val = of_get_property(node, "linux,gpio-base", &size);
637 WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__);
638 if (val) {
639 if (size != sizeof(*val))
640 dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
641 node->full_name);
642 else
643 *gpio_base = be32_to_cpup(val);
644 }
645
646 val = of_get_property(node, "polarity", NULL);
647 WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__);
648 if (val)
649 *invert = *val;
650}
651#else
652static void
653pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
654{
655 *gpio_base = -1;
656}
657#endif
658
659static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
660{
661 int ret;
662 u8 val[MAX_BANK];
663
664 ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
665 if (ret)
666 goto out;
667
668 ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
669 chip->reg_direction);
670 if (ret)
671 goto out;
672
673 /* set platform specific polarity inversion */
674 if (invert)
675 memset(val, 0xFF, NBANK(chip));
676 else
677 memset(val, 0, NBANK(chip));
678
679 ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
680out:
681 return ret;
682}
683
684static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
685{
686 int ret;
687 u8 val[MAX_BANK];
688
689 ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
690 if (ret)
691 goto out;
692 ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
693 if (ret)
694 goto out;
695
696 /* set platform specific polarity inversion */
697 if (invert)
698 memset(val, 0xFF, NBANK(chip));
699 else
700 memset(val, 0, NBANK(chip));
701 pca953x_write_regs(chip, PCA957X_INVRT, val);
702
703 /* To enable register 6, 7 to controll pull up and pull down */
704 memset(val, 0x02, NBANK(chip));
705 pca953x_write_regs(chip, PCA957X_BKEN, val);
706
707 return 0;
708out:
709 return ret;
710}
711
712static int pca953x_probe(struct i2c_client *client,
713 const struct i2c_device_id *id)
714{
715 struct pca953x_platform_data *pdata;
716 struct pca953x_chip *chip;
717 int irq_base = 0;
718 int ret;
719 u32 invert = 0;
720
721 chip = devm_kzalloc(&client->dev,
722 sizeof(struct pca953x_chip), GFP_KERNEL);
723 if (chip == NULL)
724 return -ENOMEM;
725
726 pdata = dev_get_platdata(&client->dev);
727 if (pdata) {
728 irq_base = pdata->irq_base;
729 chip->gpio_start = pdata->gpio_base;
730 invert = pdata->invert;
731 chip->names = pdata->names;
732 } else {
733 pca953x_get_alt_pdata(client, &chip->gpio_start, &invert);
734#ifdef CONFIG_OF_GPIO
735 /* If I2C node has no interrupts property, disable GPIO interrupts */
736 if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL)
737 irq_base = -1;
738#endif
739 }
740
741 chip->client = client;
742
743 chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
744
745 mutex_init(&chip->i2c_lock);
746
747 /* initialize cached registers from their original values.
748 * we can't share this chip with another i2c master.
749 */
750 pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
751
752 if (chip->chip_type == PCA953X_TYPE)
753 ret = device_pca953x_init(chip, invert);
754 else
755 ret = device_pca957x_init(chip, invert);
756 if (ret)
757 return ret;
758
759 ret = pca953x_irq_setup(chip, id, irq_base);
760 if (ret)
761 return ret;
762
763 ret = gpiochip_add(&chip->gpio_chip);
764 if (ret)
765 return ret;
766
767 if (pdata && pdata->setup) {
768 ret = pdata->setup(client, chip->gpio_chip.base,
769 chip->gpio_chip.ngpio, pdata->context);
770 if (ret < 0)
771 dev_warn(&client->dev, "setup failed, %d\n", ret);
772 }
773
774 i2c_set_clientdata(client, chip);
775 return 0;
776}
777
778static int pca953x_remove(struct i2c_client *client)
779{
780 struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
781 struct pca953x_chip *chip = i2c_get_clientdata(client);
782 int ret = 0;
783
784 if (pdata && pdata->teardown) {
785 ret = pdata->teardown(client, chip->gpio_chip.base,
786 chip->gpio_chip.ngpio, pdata->context);
787 if (ret < 0) {
788 dev_err(&client->dev, "%s failed, %d\n",
789 "teardown", ret);
790 return ret;
791 }
792 }
793
794 ret = gpiochip_remove(&chip->gpio_chip);
795 if (ret) {
796 dev_err(&client->dev, "%s failed, %d\n",
797 "gpiochip_remove()", ret);
798 return ret;
799 }
800
801 return 0;
802}
803
804static const struct of_device_id pca953x_dt_ids[] = {
805 { .compatible = "nxp,pca9505", },
806 { .compatible = "nxp,pca9534", },
807 { .compatible = "nxp,pca9535", },
808 { .compatible = "nxp,pca9536", },
809 { .compatible = "nxp,pca9537", },
810 { .compatible = "nxp,pca9538", },
811 { .compatible = "nxp,pca9539", },
812 { .compatible = "nxp,pca9554", },
813 { .compatible = "nxp,pca9555", },
814 { .compatible = "nxp,pca9556", },
815 { .compatible = "nxp,pca9557", },
816 { .compatible = "nxp,pca9574", },
817 { .compatible = "nxp,pca9575", },
818 { .compatible = "nxp,pca9698", },
819
820 { .compatible = "maxim,max7310", },
821 { .compatible = "maxim,max7312", },
822 { .compatible = "maxim,max7313", },
823 { .compatible = "maxim,max7315", },
824
825 { .compatible = "ti,pca6107", },
826 { .compatible = "ti,tca6408", },
827 { .compatible = "ti,tca6416", },
828 { .compatible = "ti,tca6424", },
829
830 { .compatible = "exar,xra1202", },
831 { }
832};
833
834MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
835
836static struct i2c_driver pca953x_driver = {
837 .driver = {
838 .name = "pca953x",
839 .of_match_table = pca953x_dt_ids,
840 },
841 .probe = pca953x_probe,
842 .remove = pca953x_remove,
843 .id_table = pca953x_id,
844};
845
846static int __init pca953x_init(void)
847{
848 return i2c_add_driver(&pca953x_driver);
849}
850/* register after i2c postcore initcall and before
851 * subsys initcalls that may rely on these GPIOs
852 */
853subsys_initcall(pca953x_init);
854
855static void __exit pca953x_exit(void)
856{
857 i2c_del_driver(&pca953x_driver);
858}
859module_exit(pca953x_exit);
860
861MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
862MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
863MODULE_LICENSE("GPL");
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/i2c.h>
20#include <linux/i2c/pca953x.h>
21#include <linux/slab.h>
22#ifdef CONFIG_OF_GPIO
23#include <linux/of_platform.h>
24#endif
25
26#define PCA953X_INPUT 0
27#define PCA953X_OUTPUT 1
28#define PCA953X_INVERT 2
29#define PCA953X_DIRECTION 3
30
31#define PCA957X_IN 0
32#define PCA957X_INVRT 1
33#define PCA957X_BKEN 2
34#define PCA957X_PUPD 3
35#define PCA957X_CFG 4
36#define PCA957X_OUT 5
37#define PCA957X_MSK 6
38#define PCA957X_INTS 7
39
40#define PCA_GPIO_MASK 0x00FF
41#define PCA_INT 0x0100
42#define PCA953X_TYPE 0x1000
43#define PCA957X_TYPE 0x2000
44
45static const struct i2c_device_id pca953x_id[] = {
46 { "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
47 { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
48 { "pca9536", 4 | PCA953X_TYPE, },
49 { "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
50 { "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
51 { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
52 { "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
53 { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
54 { "pca9556", 8 | PCA953X_TYPE, },
55 { "pca9557", 8 | PCA953X_TYPE, },
56 { "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
57 { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
58
59 { "max7310", 8 | PCA953X_TYPE, },
60 { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
61 { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
62 { "max7315", 8 | PCA953X_TYPE | PCA_INT, },
63 { "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
64 { "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
65 { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
66 /* NYET: { "tca6424", 24, }, */
67 { }
68};
69MODULE_DEVICE_TABLE(i2c, pca953x_id);
70
71struct pca953x_chip {
72 unsigned gpio_start;
73 uint16_t reg_output;
74 uint16_t reg_direction;
75 struct mutex i2c_lock;
76
77#ifdef CONFIG_GPIO_PCA953X_IRQ
78 struct mutex irq_lock;
79 uint16_t irq_mask;
80 uint16_t irq_stat;
81 uint16_t irq_trig_raise;
82 uint16_t irq_trig_fall;
83 int irq_base;
84#endif
85
86 struct i2c_client *client;
87 struct gpio_chip gpio_chip;
88 const char *const *names;
89 int chip_type;
90};
91
92static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
93{
94 int ret = 0;
95
96 if (chip->gpio_chip.ngpio <= 8)
97 ret = i2c_smbus_write_byte_data(chip->client, reg, val);
98 else {
99 switch (chip->chip_type) {
100 case PCA953X_TYPE:
101 ret = i2c_smbus_write_word_data(chip->client,
102 reg << 1, val);
103 break;
104 case PCA957X_TYPE:
105 ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
106 val & 0xff);
107 if (ret < 0)
108 break;
109 ret = i2c_smbus_write_byte_data(chip->client,
110 (reg << 1) + 1,
111 (val & 0xff00) >> 8);
112 break;
113 }
114 }
115
116 if (ret < 0) {
117 dev_err(&chip->client->dev, "failed writing register\n");
118 return ret;
119 }
120
121 return 0;
122}
123
124static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val)
125{
126 int ret;
127
128 if (chip->gpio_chip.ngpio <= 8)
129 ret = i2c_smbus_read_byte_data(chip->client, reg);
130 else
131 ret = i2c_smbus_read_word_data(chip->client, reg << 1);
132
133 if (ret < 0) {
134 dev_err(&chip->client->dev, "failed reading register\n");
135 return ret;
136 }
137
138 *val = (uint16_t)ret;
139 return 0;
140}
141
142static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
143{
144 struct pca953x_chip *chip;
145 uint16_t reg_val;
146 int ret, offset = 0;
147
148 chip = container_of(gc, struct pca953x_chip, gpio_chip);
149
150 mutex_lock(&chip->i2c_lock);
151 reg_val = chip->reg_direction | (1u << off);
152
153 switch (chip->chip_type) {
154 case PCA953X_TYPE:
155 offset = PCA953X_DIRECTION;
156 break;
157 case PCA957X_TYPE:
158 offset = PCA957X_CFG;
159 break;
160 }
161 ret = pca953x_write_reg(chip, offset, reg_val);
162 if (ret)
163 goto exit;
164
165 chip->reg_direction = reg_val;
166 ret = 0;
167exit:
168 mutex_unlock(&chip->i2c_lock);
169 return ret;
170}
171
172static int pca953x_gpio_direction_output(struct gpio_chip *gc,
173 unsigned off, int val)
174{
175 struct pca953x_chip *chip;
176 uint16_t reg_val;
177 int ret, offset = 0;
178
179 chip = container_of(gc, struct pca953x_chip, gpio_chip);
180
181 mutex_lock(&chip->i2c_lock);
182 /* set output level */
183 if (val)
184 reg_val = chip->reg_output | (1u << off);
185 else
186 reg_val = chip->reg_output & ~(1u << off);
187
188 switch (chip->chip_type) {
189 case PCA953X_TYPE:
190 offset = PCA953X_OUTPUT;
191 break;
192 case PCA957X_TYPE:
193 offset = PCA957X_OUT;
194 break;
195 }
196 ret = pca953x_write_reg(chip, offset, reg_val);
197 if (ret)
198 goto exit;
199
200 chip->reg_output = reg_val;
201
202 /* then direction */
203 reg_val = chip->reg_direction & ~(1u << off);
204 switch (chip->chip_type) {
205 case PCA953X_TYPE:
206 offset = PCA953X_DIRECTION;
207 break;
208 case PCA957X_TYPE:
209 offset = PCA957X_CFG;
210 break;
211 }
212 ret = pca953x_write_reg(chip, offset, reg_val);
213 if (ret)
214 goto exit;
215
216 chip->reg_direction = reg_val;
217 ret = 0;
218exit:
219 mutex_unlock(&chip->i2c_lock);
220 return ret;
221}
222
223static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
224{
225 struct pca953x_chip *chip;
226 uint16_t reg_val;
227 int ret, offset = 0;
228
229 chip = container_of(gc, struct pca953x_chip, gpio_chip);
230
231 mutex_lock(&chip->i2c_lock);
232 switch (chip->chip_type) {
233 case PCA953X_TYPE:
234 offset = PCA953X_INPUT;
235 break;
236 case PCA957X_TYPE:
237 offset = PCA957X_IN;
238 break;
239 }
240 ret = pca953x_read_reg(chip, offset, ®_val);
241 mutex_unlock(&chip->i2c_lock);
242 if (ret < 0) {
243 /* NOTE: diagnostic already emitted; that's all we should
244 * do unless gpio_*_value_cansleep() calls become different
245 * from their nonsleeping siblings (and report faults).
246 */
247 return 0;
248 }
249
250 return (reg_val & (1u << off)) ? 1 : 0;
251}
252
253static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
254{
255 struct pca953x_chip *chip;
256 uint16_t reg_val;
257 int ret, offset = 0;
258
259 chip = container_of(gc, struct pca953x_chip, gpio_chip);
260
261 mutex_lock(&chip->i2c_lock);
262 if (val)
263 reg_val = chip->reg_output | (1u << off);
264 else
265 reg_val = chip->reg_output & ~(1u << off);
266
267 switch (chip->chip_type) {
268 case PCA953X_TYPE:
269 offset = PCA953X_OUTPUT;
270 break;
271 case PCA957X_TYPE:
272 offset = PCA957X_OUT;
273 break;
274 }
275 ret = pca953x_write_reg(chip, offset, reg_val);
276 if (ret)
277 goto exit;
278
279 chip->reg_output = reg_val;
280exit:
281 mutex_unlock(&chip->i2c_lock);
282}
283
284static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
285{
286 struct gpio_chip *gc;
287
288 gc = &chip->gpio_chip;
289
290 gc->direction_input = pca953x_gpio_direction_input;
291 gc->direction_output = pca953x_gpio_direction_output;
292 gc->get = pca953x_gpio_get_value;
293 gc->set = pca953x_gpio_set_value;
294 gc->can_sleep = 1;
295
296 gc->base = chip->gpio_start;
297 gc->ngpio = gpios;
298 gc->label = chip->client->name;
299 gc->dev = &chip->client->dev;
300 gc->owner = THIS_MODULE;
301 gc->names = chip->names;
302}
303
304#ifdef CONFIG_GPIO_PCA953X_IRQ
305static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off)
306{
307 struct pca953x_chip *chip;
308
309 chip = container_of(gc, struct pca953x_chip, gpio_chip);
310 return chip->irq_base + off;
311}
312
313static void pca953x_irq_mask(struct irq_data *d)
314{
315 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
316
317 chip->irq_mask &= ~(1 << (d->irq - chip->irq_base));
318}
319
320static void pca953x_irq_unmask(struct irq_data *d)
321{
322 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
323
324 chip->irq_mask |= 1 << (d->irq - chip->irq_base);
325}
326
327static void pca953x_irq_bus_lock(struct irq_data *d)
328{
329 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
330
331 mutex_lock(&chip->irq_lock);
332}
333
334static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
335{
336 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
337 uint16_t new_irqs;
338 uint16_t level;
339
340 /* Look for any newly setup interrupt */
341 new_irqs = chip->irq_trig_fall | chip->irq_trig_raise;
342 new_irqs &= ~chip->reg_direction;
343
344 while (new_irqs) {
345 level = __ffs(new_irqs);
346 pca953x_gpio_direction_input(&chip->gpio_chip, level);
347 new_irqs &= ~(1 << level);
348 }
349
350 mutex_unlock(&chip->irq_lock);
351}
352
353static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
354{
355 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
356 uint16_t level = d->irq - chip->irq_base;
357 uint16_t mask = 1 << level;
358
359 if (!(type & IRQ_TYPE_EDGE_BOTH)) {
360 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
361 d->irq, type);
362 return -EINVAL;
363 }
364
365 if (type & IRQ_TYPE_EDGE_FALLING)
366 chip->irq_trig_fall |= mask;
367 else
368 chip->irq_trig_fall &= ~mask;
369
370 if (type & IRQ_TYPE_EDGE_RISING)
371 chip->irq_trig_raise |= mask;
372 else
373 chip->irq_trig_raise &= ~mask;
374
375 return 0;
376}
377
378static struct irq_chip pca953x_irq_chip = {
379 .name = "pca953x",
380 .irq_mask = pca953x_irq_mask,
381 .irq_unmask = pca953x_irq_unmask,
382 .irq_bus_lock = pca953x_irq_bus_lock,
383 .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
384 .irq_set_type = pca953x_irq_set_type,
385};
386
387static uint16_t pca953x_irq_pending(struct pca953x_chip *chip)
388{
389 uint16_t cur_stat;
390 uint16_t old_stat;
391 uint16_t pending;
392 uint16_t trigger;
393 int ret, offset = 0;
394
395 switch (chip->chip_type) {
396 case PCA953X_TYPE:
397 offset = PCA953X_INPUT;
398 break;
399 case PCA957X_TYPE:
400 offset = PCA957X_IN;
401 break;
402 }
403 ret = pca953x_read_reg(chip, offset, &cur_stat);
404 if (ret)
405 return 0;
406
407 /* Remove output pins from the equation */
408 cur_stat &= chip->reg_direction;
409
410 old_stat = chip->irq_stat;
411 trigger = (cur_stat ^ old_stat) & chip->irq_mask;
412
413 if (!trigger)
414 return 0;
415
416 chip->irq_stat = cur_stat;
417
418 pending = (old_stat & chip->irq_trig_fall) |
419 (cur_stat & chip->irq_trig_raise);
420 pending &= trigger;
421
422 return pending;
423}
424
425static irqreturn_t pca953x_irq_handler(int irq, void *devid)
426{
427 struct pca953x_chip *chip = devid;
428 uint16_t pending;
429 uint16_t level;
430
431 pending = pca953x_irq_pending(chip);
432
433 if (!pending)
434 return IRQ_HANDLED;
435
436 do {
437 level = __ffs(pending);
438 handle_nested_irq(level + chip->irq_base);
439
440 pending &= ~(1 << level);
441 } while (pending);
442
443 return IRQ_HANDLED;
444}
445
446static int pca953x_irq_setup(struct pca953x_chip *chip,
447 const struct i2c_device_id *id,
448 int irq_base)
449{
450 struct i2c_client *client = chip->client;
451 int ret, offset = 0;
452
453 if (irq_base != -1
454 && (id->driver_data & PCA_INT)) {
455 int lvl;
456
457 switch (chip->chip_type) {
458 case PCA953X_TYPE:
459 offset = PCA953X_INPUT;
460 break;
461 case PCA957X_TYPE:
462 offset = PCA957X_IN;
463 break;
464 }
465 ret = pca953x_read_reg(chip, offset, &chip->irq_stat);
466 if (ret)
467 goto out_failed;
468
469 /*
470 * There is no way to know which GPIO line generated the
471 * interrupt. We have to rely on the previous read for
472 * this purpose.
473 */
474 chip->irq_stat &= chip->reg_direction;
475 mutex_init(&chip->irq_lock);
476
477 chip->irq_base = irq_alloc_descs(-1, irq_base, chip->gpio_chip.ngpio, -1);
478 if (chip->irq_base < 0)
479 goto out_failed;
480
481 for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) {
482 int irq = lvl + chip->irq_base;
483
484 irq_clear_status_flags(irq, IRQ_NOREQUEST);
485 irq_set_chip_data(irq, chip);
486 irq_set_chip(irq, &pca953x_irq_chip);
487 irq_set_nested_thread(irq, true);
488#ifdef CONFIG_ARM
489 set_irq_flags(irq, IRQF_VALID);
490#else
491 irq_set_noprobe(irq);
492#endif
493 }
494
495 ret = request_threaded_irq(client->irq,
496 NULL,
497 pca953x_irq_handler,
498 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
499 dev_name(&client->dev), chip);
500 if (ret) {
501 dev_err(&client->dev, "failed to request irq %d\n",
502 client->irq);
503 goto out_failed;
504 }
505
506 chip->gpio_chip.to_irq = pca953x_gpio_to_irq;
507 }
508
509 return 0;
510
511out_failed:
512 chip->irq_base = -1;
513 return ret;
514}
515
516static void pca953x_irq_teardown(struct pca953x_chip *chip)
517{
518 if (chip->irq_base != -1) {
519 irq_free_descs(chip->irq_base, chip->gpio_chip.ngpio);
520 free_irq(chip->client->irq, chip);
521 }
522}
523#else /* CONFIG_GPIO_PCA953X_IRQ */
524static int pca953x_irq_setup(struct pca953x_chip *chip,
525 const struct i2c_device_id *id,
526 int irq_base)
527{
528 struct i2c_client *client = chip->client;
529
530 if (irq_base != -1 && (id->driver_data & PCA_INT))
531 dev_warn(&client->dev, "interrupt support not compiled in\n");
532
533 return 0;
534}
535
536static void pca953x_irq_teardown(struct pca953x_chip *chip)
537{
538}
539#endif
540
541/*
542 * Handlers for alternative sources of platform_data
543 */
544#ifdef CONFIG_OF_GPIO
545/*
546 * Translate OpenFirmware node properties into platform_data
547 * WARNING: This is DEPRECATED and will be removed eventually!
548 */
549void
550pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, int *invert)
551{
552 struct device_node *node;
553 const __be32 *val;
554 int size;
555
556 node = client->dev.of_node;
557 if (node == NULL)
558 return;
559
560 *gpio_base = -1;
561 val = of_get_property(node, "linux,gpio-base", &size);
562 WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__);
563 if (val) {
564 if (size != sizeof(*val))
565 dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
566 node->full_name);
567 else
568 *gpio_base = be32_to_cpup(val);
569 }
570
571 val = of_get_property(node, "polarity", NULL);
572 WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__);
573 if (val)
574 *invert = *val;
575}
576#else
577void
578pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, int *invert)
579{
580 *gpio_base = -1;
581}
582#endif
583
584static int __devinit device_pca953x_init(struct pca953x_chip *chip, int invert)
585{
586 int ret;
587
588 ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
589 if (ret)
590 goto out;
591
592 ret = pca953x_read_reg(chip, PCA953X_DIRECTION,
593 &chip->reg_direction);
594 if (ret)
595 goto out;
596
597 /* set platform specific polarity inversion */
598 ret = pca953x_write_reg(chip, PCA953X_INVERT, invert);
599 if (ret)
600 goto out;
601 return 0;
602out:
603 return ret;
604}
605
606static int __devinit device_pca957x_init(struct pca953x_chip *chip, int invert)
607{
608 int ret;
609 uint16_t val = 0;
610
611 /* Let every port in proper state, that could save power */
612 pca953x_write_reg(chip, PCA957X_PUPD, 0x0);
613 pca953x_write_reg(chip, PCA957X_CFG, 0xffff);
614 pca953x_write_reg(chip, PCA957X_OUT, 0x0);
615
616 ret = pca953x_read_reg(chip, PCA957X_IN, &val);
617 if (ret)
618 goto out;
619 ret = pca953x_read_reg(chip, PCA957X_OUT, &chip->reg_output);
620 if (ret)
621 goto out;
622 ret = pca953x_read_reg(chip, PCA957X_CFG, &chip->reg_direction);
623 if (ret)
624 goto out;
625
626 /* set platform specific polarity inversion */
627 pca953x_write_reg(chip, PCA957X_INVRT, invert);
628
629 /* To enable register 6, 7 to controll pull up and pull down */
630 pca953x_write_reg(chip, PCA957X_BKEN, 0x202);
631
632 return 0;
633out:
634 return ret;
635}
636
637static int __devinit pca953x_probe(struct i2c_client *client,
638 const struct i2c_device_id *id)
639{
640 struct pca953x_platform_data *pdata;
641 struct pca953x_chip *chip;
642 int irq_base=0, invert=0;
643 int ret = 0;
644
645 chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
646 if (chip == NULL)
647 return -ENOMEM;
648
649 pdata = client->dev.platform_data;
650 if (pdata) {
651 irq_base = pdata->irq_base;
652 chip->gpio_start = pdata->gpio_base;
653 invert = pdata->invert;
654 chip->names = pdata->names;
655 } else {
656 pca953x_get_alt_pdata(client, &chip->gpio_start, &invert);
657#ifdef CONFIG_OF_GPIO
658 /* If I2C node has no interrupts property, disable GPIO interrupts */
659 if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL)
660 irq_base = -1;
661#endif
662 }
663
664 chip->client = client;
665
666 chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
667
668 mutex_init(&chip->i2c_lock);
669
670 /* initialize cached registers from their original values.
671 * we can't share this chip with another i2c master.
672 */
673 pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
674
675 if (chip->chip_type == PCA953X_TYPE)
676 device_pca953x_init(chip, invert);
677 else if (chip->chip_type == PCA957X_TYPE)
678 device_pca957x_init(chip, invert);
679 else
680 goto out_failed;
681
682 ret = pca953x_irq_setup(chip, id, irq_base);
683 if (ret)
684 goto out_failed;
685
686 ret = gpiochip_add(&chip->gpio_chip);
687 if (ret)
688 goto out_failed_irq;
689
690 if (pdata && pdata->setup) {
691 ret = pdata->setup(client, chip->gpio_chip.base,
692 chip->gpio_chip.ngpio, pdata->context);
693 if (ret < 0)
694 dev_warn(&client->dev, "setup failed, %d\n", ret);
695 }
696
697 i2c_set_clientdata(client, chip);
698 return 0;
699
700out_failed_irq:
701 pca953x_irq_teardown(chip);
702out_failed:
703 kfree(chip);
704 return ret;
705}
706
707static int pca953x_remove(struct i2c_client *client)
708{
709 struct pca953x_platform_data *pdata = client->dev.platform_data;
710 struct pca953x_chip *chip = i2c_get_clientdata(client);
711 int ret = 0;
712
713 if (pdata && pdata->teardown) {
714 ret = pdata->teardown(client, chip->gpio_chip.base,
715 chip->gpio_chip.ngpio, pdata->context);
716 if (ret < 0) {
717 dev_err(&client->dev, "%s failed, %d\n",
718 "teardown", ret);
719 return ret;
720 }
721 }
722
723 ret = gpiochip_remove(&chip->gpio_chip);
724 if (ret) {
725 dev_err(&client->dev, "%s failed, %d\n",
726 "gpiochip_remove()", ret);
727 return ret;
728 }
729
730 pca953x_irq_teardown(chip);
731 kfree(chip);
732 return 0;
733}
734
735static struct i2c_driver pca953x_driver = {
736 .driver = {
737 .name = "pca953x",
738 },
739 .probe = pca953x_probe,
740 .remove = pca953x_remove,
741 .id_table = pca953x_id,
742};
743
744static int __init pca953x_init(void)
745{
746 return i2c_add_driver(&pca953x_driver);
747}
748/* register after i2c postcore initcall and before
749 * subsys initcalls that may rely on these GPIOs
750 */
751subsys_initcall(pca953x_init);
752
753static void __exit pca953x_exit(void)
754{
755 i2c_del_driver(&pca953x_driver);
756}
757module_exit(pca953x_exit);
758
759MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
760MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
761MODULE_LICENSE("GPL");