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xen-netback: Handle guests with too many frags
[linux-2.6/btrfs-unstable.git] / drivers / gpio / gpio-pca953x.c
blob019b23b955a2884c6f2b63233819cdd4d3beee73
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/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
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 } else {
150 switch (chip->chip_type) {
151 case PCA953X_TYPE:
152 ret = i2c_smbus_write_word_data(chip->client,
153 reg << 1, (u16) *val);
154 break;
155 case PCA957X_TYPE:
156 ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
157 val[0]);
158 if (ret < 0)
159 break;
160 ret = i2c_smbus_write_byte_data(chip->client,
161 (reg << 1) + 1,
162 val[1]);
163 break;
164 }
165 }
166
167 if (ret < 0) {
168 dev_err(&chip->client->dev, "failed writing register\n");
169 return ret;
170 }
171
172 return 0;
173 }
174
175 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
176 {
177 int ret;
178
179 if (chip->gpio_chip.ngpio <= 8) {
180 ret = i2c_smbus_read_byte_data(chip->client, reg);
181 *val = ret;
182 } else if (chip->gpio_chip.ngpio >= 24) {
183 int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
184
185 ret = i2c_smbus_read_i2c_block_data(chip->client,
186 (reg << bank_shift) | REG_ADDR_AI,
187 NBANK(chip), val);
188 } else {
189 ret = i2c_smbus_read_word_data(chip->client, reg << 1);
190 val[0] = (u16)ret & 0xFF;
191 val[1] = (u16)ret >> 8;
192 }
193 if (ret < 0) {
194 dev_err(&chip->client->dev, "failed reading register\n");
195 return ret;
196 }
197
198 return 0;
199 }
200
201 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
202 {
203 struct pca953x_chip *chip;
204 u8 reg_val;
205 int ret, offset = 0;
206
207 chip = container_of(gc, struct pca953x_chip, gpio_chip);
208
209 mutex_lock(&chip->i2c_lock);
210 reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
211
212 switch (chip->chip_type) {
213 case PCA953X_TYPE:
214 offset = PCA953X_DIRECTION;
215 break;
216 case PCA957X_TYPE:
217 offset = PCA957X_CFG;
218 break;
219 }
220 ret = pca953x_write_single(chip, offset, reg_val, off);
221 if (ret)
222 goto exit;
223
224 chip->reg_direction[off / BANK_SZ] = reg_val;
225 ret = 0;
226 exit:
227 mutex_unlock(&chip->i2c_lock);
228 return ret;
229 }
230
231 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
232 unsigned off, int val)
233 {
234 struct pca953x_chip *chip;
235 u8 reg_val;
236 int ret, offset = 0;
237
238 chip = container_of(gc, struct pca953x_chip, gpio_chip);
239
240 mutex_lock(&chip->i2c_lock);
241 /* set output level */
242 if (val)
243 reg_val = chip->reg_output[off / BANK_SZ]
244 | (1u << (off % BANK_SZ));
245 else
246 reg_val = chip->reg_output[off / BANK_SZ]
247 & ~(1u << (off % BANK_SZ));
248
249 switch (chip->chip_type) {
250 case PCA953X_TYPE:
251 offset = PCA953X_OUTPUT;
252 break;
253 case PCA957X_TYPE:
254 offset = PCA957X_OUT;
255 break;
256 }
257 ret = pca953x_write_single(chip, offset, reg_val, off);
258 if (ret)
259 goto exit;
260
261 chip->reg_output[off / BANK_SZ] = reg_val;
262
263 /* then direction */
264 reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
265 switch (chip->chip_type) {
266 case PCA953X_TYPE:
267 offset = PCA953X_DIRECTION;
268 break;
269 case PCA957X_TYPE:
270 offset = PCA957X_CFG;
271 break;
272 }
273 ret = pca953x_write_single(chip, offset, reg_val, off);
274 if (ret)
275 goto exit;
276
277 chip->reg_direction[off / BANK_SZ] = reg_val;
278 ret = 0;
279 exit:
280 mutex_unlock(&chip->i2c_lock);
281 return ret;
282 }
283
284 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
285 {
286 struct pca953x_chip *chip;
287 u32 reg_val;
288 int ret, offset = 0;
289
290 chip = container_of(gc, struct pca953x_chip, gpio_chip);
291
292 mutex_lock(&chip->i2c_lock);
293 switch (chip->chip_type) {
294 case PCA953X_TYPE:
295 offset = PCA953X_INPUT;
296 break;
297 case PCA957X_TYPE:
298 offset = PCA957X_IN;
299 break;
300 }
301 ret = pca953x_read_single(chip, offset, &reg_val, off);
302 mutex_unlock(&chip->i2c_lock);
303 if (ret < 0) {
304 /* NOTE: diagnostic already emitted; that's all we should
305 * do unless gpio_*_value_cansleep() calls become different
306 * from their nonsleeping siblings (and report faults).
307 */
308 return 0;
309 }
310
311 return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
312 }
313
314 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
315 {
316 struct pca953x_chip *chip;
317 u8 reg_val;
318 int ret, offset = 0;
319
320 chip = container_of(gc, struct pca953x_chip, gpio_chip);
321
322 mutex_lock(&chip->i2c_lock);
323 if (val)
324 reg_val = chip->reg_output[off / BANK_SZ]
325 | (1u << (off % BANK_SZ));
326 else
327 reg_val = chip->reg_output[off / BANK_SZ]
328 & ~(1u << (off % BANK_SZ));
329
330 switch (chip->chip_type) {
331 case PCA953X_TYPE:
332 offset = PCA953X_OUTPUT;
333 break;
334 case PCA957X_TYPE:
335 offset = PCA957X_OUT;
336 break;
337 }
338 ret = pca953x_write_single(chip, offset, reg_val, off);
339 if (ret)
340 goto exit;
341
342 chip->reg_output[off / BANK_SZ] = reg_val;
343 exit:
344 mutex_unlock(&chip->i2c_lock);
345 }
346
347 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
348 {
349 struct gpio_chip *gc;
350
351 gc = &chip->gpio_chip;
352
353 gc->direction_input = pca953x_gpio_direction_input;
354 gc->direction_output = pca953x_gpio_direction_output;
355 gc->get = pca953x_gpio_get_value;
356 gc->set = pca953x_gpio_set_value;
357 gc->can_sleep = true;
358
359 gc->base = chip->gpio_start;
360 gc->ngpio = gpios;
361 gc->label = chip->client->name;
362 gc->dev = &chip->client->dev;
363 gc->owner = THIS_MODULE;
364 gc->names = chip->names;
365 }
366
367 #ifdef CONFIG_GPIO_PCA953X_IRQ
368 static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off)
369 {
370 struct pca953x_chip *chip;
371
372 chip = container_of(gc, struct pca953x_chip, gpio_chip);
373 return irq_create_mapping(chip->domain, off);
374 }
375
376 static void pca953x_irq_mask(struct irq_data *d)
377 {
378 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
379
380 chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
381 }
382
383 static void pca953x_irq_unmask(struct irq_data *d)
384 {
385 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
386
387 chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
388 }
389
390 static void pca953x_irq_bus_lock(struct irq_data *d)
391 {
392 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
393
394 mutex_lock(&chip->irq_lock);
395 }
396
397 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
398 {
399 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
400 u8 new_irqs;
401 int level, i;
402
403 /* Look for any newly setup interrupt */
404 for (i = 0; i < NBANK(chip); i++) {
405 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
406 new_irqs &= ~chip->reg_direction[i];
407
408 while (new_irqs) {
409 level = __ffs(new_irqs);
410 pca953x_gpio_direction_input(&chip->gpio_chip,
411 level + (BANK_SZ * i));
412 new_irqs &= ~(1 << level);
413 }
414 }
415
416 mutex_unlock(&chip->irq_lock);
417 }
418
419 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
420 {
421 struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
422 int bank_nb = d->hwirq / BANK_SZ;
423 u8 mask = 1 << (d->hwirq % BANK_SZ);
424
425 if (!(type & IRQ_TYPE_EDGE_BOTH)) {
426 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
427 d->irq, type);
428 return -EINVAL;
429 }
430
431 if (type & IRQ_TYPE_EDGE_FALLING)
432 chip->irq_trig_fall[bank_nb] |= mask;
433 else
434 chip->irq_trig_fall[bank_nb] &= ~mask;
435
436 if (type & IRQ_TYPE_EDGE_RISING)
437 chip->irq_trig_raise[bank_nb] |= mask;
438 else
439 chip->irq_trig_raise[bank_nb] &= ~mask;
440
441 return 0;
442 }
443
444 static struct irq_chip pca953x_irq_chip = {
445 .name = "pca953x",
446 .irq_mask = pca953x_irq_mask,
447 .irq_unmask = pca953x_irq_unmask,
448 .irq_bus_lock = pca953x_irq_bus_lock,
449 .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
450 .irq_set_type = pca953x_irq_set_type,
451 };
452
453 static u8 pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
454 {
455 u8 cur_stat[MAX_BANK];
456 u8 old_stat[MAX_BANK];
457 u8 pendings = 0;
458 u8 trigger[MAX_BANK], triggers = 0;
459 int ret, i, offset = 0;
460
461 switch (chip->chip_type) {
462 case PCA953X_TYPE:
463 offset = PCA953X_INPUT;
464 break;
465 case PCA957X_TYPE:
466 offset = PCA957X_IN;
467 break;
468 }
469 ret = pca953x_read_regs(chip, offset, cur_stat);
470 if (ret)
471 return 0;
472
473 /* Remove output pins from the equation */
474 for (i = 0; i < NBANK(chip); i++)
475 cur_stat[i] &= chip->reg_direction[i];
476
477 memcpy(old_stat, chip->irq_stat, NBANK(chip));
478
479 for (i = 0; i < NBANK(chip); i++) {
480 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
481 triggers += trigger[i];
482 }
483
484 if (!triggers)
485 return 0;
486
487 memcpy(chip->irq_stat, cur_stat, NBANK(chip));
488
489 for (i = 0; i < NBANK(chip); i++) {
490 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
491 (cur_stat[i] & chip->irq_trig_raise[i]);
492 pending[i] &= trigger[i];
493 pendings += pending[i];
494 }
495
496 return pendings;
497 }
498
499 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
500 {
501 struct pca953x_chip *chip = devid;
502 u8 pending[MAX_BANK];
503 u8 level;
504 int i;
505
506 if (!pca953x_irq_pending(chip, pending))
507 return IRQ_HANDLED;
508
509 for (i = 0; i < NBANK(chip); i++) {
510 while (pending[i]) {
511 level = __ffs(pending[i]);
512 handle_nested_irq(irq_find_mapping(chip->domain,
513 level + (BANK_SZ * i)));
514 pending[i] &= ~(1 << level);
515 }
516 }
517
518 return IRQ_HANDLED;
519 }
520
521 static int pca953x_gpio_irq_map(struct irq_domain *d, unsigned int irq,
522 irq_hw_number_t hwirq)
523 {
524 irq_clear_status_flags(irq, IRQ_NOREQUEST);
525 irq_set_chip_data(irq, d->host_data);
526 irq_set_chip(irq, &pca953x_irq_chip);
527 irq_set_nested_thread(irq, true);
528 #ifdef CONFIG_ARM
529 set_irq_flags(irq, IRQF_VALID);
530 #else
531 irq_set_noprobe(irq);
532 #endif
533
534 return 0;
535 }
536
537 static const struct irq_domain_ops pca953x_irq_simple_ops = {
538 .map = pca953x_gpio_irq_map,
539 .xlate = irq_domain_xlate_twocell,
540 };
541
542 static int pca953x_irq_setup(struct pca953x_chip *chip,
543 const struct i2c_device_id *id,
544 int irq_base)
545 {
546 struct i2c_client *client = chip->client;
547 int ret, i, offset = 0;
548
549 if (irq_base != -1
550 && (id->driver_data & PCA_INT)) {
551
552 switch (chip->chip_type) {
553 case PCA953X_TYPE:
554 offset = PCA953X_INPUT;
555 break;
556 case PCA957X_TYPE:
557 offset = PCA957X_IN;
558 break;
559 }
560 ret = pca953x_read_regs(chip, offset, chip->irq_stat);
561 if (ret)
562 return ret;
563
564 /*
565 * There is no way to know which GPIO line generated the
566 * interrupt. We have to rely on the previous read for
567 * this purpose.
568 */
569 for (i = 0; i < NBANK(chip); i++)
570 chip->irq_stat[i] &= chip->reg_direction[i];
571 mutex_init(&chip->irq_lock);
572
573 chip->domain = irq_domain_add_simple(client->dev.of_node,
574 chip->gpio_chip.ngpio,
575 irq_base,
576 &pca953x_irq_simple_ops,
577 chip);
578 if (!chip->domain)
579 return -ENODEV;
580
581 ret = devm_request_threaded_irq(&client->dev,
582 client->irq,
583 NULL,
584 pca953x_irq_handler,
585 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
586 dev_name(&client->dev), chip);
587 if (ret) {
588 dev_err(&client->dev, "failed to request irq %d\n",
589 client->irq);
590 return ret;
591 }
592
593 chip->gpio_chip.to_irq = pca953x_gpio_to_irq;
594 }
595
596 return 0;
597 }
598
599 #else /* CONFIG_GPIO_PCA953X_IRQ */
600 static int pca953x_irq_setup(struct pca953x_chip *chip,
601 const struct i2c_device_id *id,
602 int irq_base)
603 {
604 struct i2c_client *client = chip->client;
605
606 if (irq_base != -1 && (id->driver_data & PCA_INT))
607 dev_warn(&client->dev, "interrupt support not compiled in\n");
608
609 return 0;
610 }
611 #endif
612
613 /*
614 * Handlers for alternative sources of platform_data
615 */
616 #ifdef CONFIG_OF_GPIO
617 /*
618 * Translate OpenFirmware node properties into platform_data
619 * WARNING: This is DEPRECATED and will be removed eventually!
620 */
621 static void
622 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
623 {
624 struct device_node *node;
625 const __be32 *val;
626 int size;
627
628 node = client->dev.of_node;
629 if (node == NULL)
630 return;
631
632 *gpio_base = -1;
633 val = of_get_property(node, "linux,gpio-base", &size);
634 WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__);
635 if (val) {
636 if (size != sizeof(*val))
637 dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
638 node->full_name);
639 else
640 *gpio_base = be32_to_cpup(val);
641 }
642
643 val = of_get_property(node, "polarity", NULL);
644 WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__);
645 if (val)
646 *invert = *val;
647 }
648 #else
649 static void
650 pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
651 {
652 *gpio_base = -1;
653 }
654 #endif
655
656 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
657 {
658 int ret;
659 u8 val[MAX_BANK];
660
661 ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
662 if (ret)
663 goto out;
664
665 ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
666 chip->reg_direction);
667 if (ret)
668 goto out;
669
670 /* set platform specific polarity inversion */
671 if (invert)
672 memset(val, 0xFF, NBANK(chip));
673 else
674 memset(val, 0, NBANK(chip));
675
676 ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
677 out:
678 return ret;
679 }
680
681 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
682 {
683 int ret;
684 u8 val[MAX_BANK];
685
686 ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
687 if (ret)
688 goto out;
689 ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
690 if (ret)
691 goto out;
692
693 /* set platform specific polarity inversion */
694 if (invert)
695 memset(val, 0xFF, NBANK(chip));
696 else
697 memset(val, 0, NBANK(chip));
698 pca953x_write_regs(chip, PCA957X_INVRT, val);
699
700 /* To enable register 6, 7 to controll pull up and pull down */
701 memset(val, 0x02, NBANK(chip));
702 pca953x_write_regs(chip, PCA957X_BKEN, val);
703
704 return 0;
705 out:
706 return ret;
707 }
708
709 static int pca953x_probe(struct i2c_client *client,
710 const struct i2c_device_id *id)
711 {
712 struct pca953x_platform_data *pdata;
713 struct pca953x_chip *chip;
714 int irq_base = 0;
715 int ret;
716 u32 invert = 0;
717
718 chip = devm_kzalloc(&client->dev,
719 sizeof(struct pca953x_chip), GFP_KERNEL);
720 if (chip == NULL)
721 return -ENOMEM;
722
723 pdata = dev_get_platdata(&client->dev);
724 if (pdata) {
725 irq_base = pdata->irq_base;
726 chip->gpio_start = pdata->gpio_base;
727 invert = pdata->invert;
728 chip->names = pdata->names;
729 } else {
730 pca953x_get_alt_pdata(client, &chip->gpio_start, &invert);
731 #ifdef CONFIG_OF_GPIO
732 /* If I2C node has no interrupts property, disable GPIO interrupts */
733 if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL)
734 irq_base = -1;
735 #endif
736 }
737
738 chip->client = client;
739
740 chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
741
742 mutex_init(&chip->i2c_lock);
743
744 /* initialize cached registers from their original values.
745 * we can't share this chip with another i2c master.
746 */
747 pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
748
749 if (chip->chip_type == PCA953X_TYPE)
750 ret = device_pca953x_init(chip, invert);
751 else
752 ret = device_pca957x_init(chip, invert);
753 if (ret)
754 return ret;
755
756 ret = pca953x_irq_setup(chip, id, irq_base);
757 if (ret)
758 return ret;
759
760 ret = gpiochip_add(&chip->gpio_chip);
761 if (ret)
762 return ret;
763
764 if (pdata && pdata->setup) {
765 ret = pdata->setup(client, chip->gpio_chip.base,
766 chip->gpio_chip.ngpio, pdata->context);
767 if (ret < 0)
768 dev_warn(&client->dev, "setup failed, %d\n", ret);
769 }
770
771 i2c_set_clientdata(client, chip);
772 return 0;
773 }
774
775 static int pca953x_remove(struct i2c_client *client)
776 {
777 struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
778 struct pca953x_chip *chip = i2c_get_clientdata(client);
779 int ret = 0;
780
781 if (pdata && pdata->teardown) {
782 ret = pdata->teardown(client, chip->gpio_chip.base,
783 chip->gpio_chip.ngpio, pdata->context);
784 if (ret < 0) {
785 dev_err(&client->dev, "%s failed, %d\n",
786 "teardown", ret);
787 return ret;
788 }
789 }
790
791 ret = gpiochip_remove(&chip->gpio_chip);
792 if (ret) {
793 dev_err(&client->dev, "%s failed, %d\n",
794 "gpiochip_remove()", ret);
795 return ret;
796 }
797
798 return 0;
799 }
800
801 static const struct of_device_id pca953x_dt_ids[] = {
802 { .compatible = "nxp,pca9505", },
803 { .compatible = "nxp,pca9534", },
804 { .compatible = "nxp,pca9535", },
805 { .compatible = "nxp,pca9536", },
806 { .compatible = "nxp,pca9537", },
807 { .compatible = "nxp,pca9538", },
808 { .compatible = "nxp,pca9539", },
809 { .compatible = "nxp,pca9554", },
810 { .compatible = "nxp,pca9555", },
811 { .compatible = "nxp,pca9556", },
812 { .compatible = "nxp,pca9557", },
813 { .compatible = "nxp,pca9574", },
814 { .compatible = "nxp,pca9575", },
815
816 { .compatible = "maxim,max7310", },
817 { .compatible = "maxim,max7312", },
818 { .compatible = "maxim,max7313", },
819 { .compatible = "maxim,max7315", },
820
821 { .compatible = "ti,pca6107", },
822 { .compatible = "ti,tca6408", },
823 { .compatible = "ti,tca6416", },
824 { .compatible = "ti,tca6424", },
825 { }
826 };
827
828 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
829
830 static struct i2c_driver pca953x_driver = {
831 .driver = {
832 .name = "pca953x",
833 .of_match_table = pca953x_dt_ids,
834 },
835 .probe = pca953x_probe,
836 .remove = pca953x_remove,
837 .id_table = pca953x_id,
838 };
839
840 static int __init pca953x_init(void)
841 {
842 return i2c_add_driver(&pca953x_driver);
843 }
844 /* register after i2c postcore initcall and before
845 * subsys initcalls that may rely on these GPIOs
846 */
847 subsys_initcall(pca953x_init);
848
849 static void __exit pca953x_exit(void)
850 {
851 i2c_del_driver(&pca953x_driver);
852 }
853 module_exit(pca953x_exit);
854
855 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
856 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
857 MODULE_LICENSE("GPL");
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