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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / gpio / max732x.c
blob7ae00547b03063407b050dfac5c75c5b724a5769
1 /*
2 * max732x.c - I2C Port Expander with 8/16 I/O
3 *
4 * Copyright (C) 2007 Marvell International Ltd.
5 * Copyright (C) 2008 Jack Ren <jack.ren@marvell.com>
6 * Copyright (C) 2008 Eric Miao <eric.miao@marvell.com>
7 *
8 * Derived from drivers/gpio/pca953x.c
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
13 */
14
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/gpio.h>
20 #include <linux/interrupt.h>
21 #include <linux/irq.h>
22 #include <linux/i2c.h>
23 #include <linux/i2c/max732x.h>
24
25
26
27 #define PORT_NONE 0x0 /* '/' No Port */
28 #define PORT_OUTPUT 0x1 /* 'O' Push-Pull, Output Only */
29 #define PORT_INPUT 0x2 /* 'I' Input Only */
30 #define PORT_OPENDRAIN 0x3 /* 'P' Open-Drain, I/O */
31
32 #define IO_4I4O 0x5AA5 /* O7 O6 I5 I4 I3 I2 O1 O0 */
33 #define IO_4P4O 0x5FF5 /* O7 O6 P5 P4 P3 P2 O1 O0 */
34 #define IO_8I 0xAAAA /* I7 I6 I5 I4 I3 I2 I1 I0 */
35 #define IO_8P 0xFFFF /* P7 P6 P5 P4 P3 P2 P1 P0 */
36 #define IO_8O 0x5555 /* O7 O6 O5 O4 O3 O2 O1 O0 */
37
38 #define GROUP_A(x) ((x) & 0xffff) /* I2C Addr: 0b'110xxxx */
39 #define GROUP_B(x) ((x) << 16) /* I2C Addr: 0b'101xxxx */
40
41 #define INT_NONE 0x0 /* No interrupt capability */
42 #define INT_NO_MASK 0x1 /* Has interrupts, no mask */
43 #define INT_INDEP_MASK 0x2 /* Has interrupts, independent mask */
44 #define INT_MERGED_MASK 0x3 /* Has interrupts, merged mask */
45
46 #define INT_CAPS(x) (((uint64_t)(x)) << 32)
47
48 enum {
49 MAX7319,
50 MAX7320,
51 MAX7321,
52 MAX7322,
53 MAX7323,
54 MAX7324,
55 MAX7325,
56 MAX7326,
57 MAX7327,
58 };
59
60 static uint64_t max732x_features[] = {
61 [MAX7319] = GROUP_A(IO_8I) | INT_CAPS(INT_MERGED_MASK),
62 [MAX7320] = GROUP_B(IO_8O),
63 [MAX7321] = GROUP_A(IO_8P) | INT_CAPS(INT_NO_MASK),
64 [MAX7322] = GROUP_A(IO_4I4O) | INT_CAPS(INT_MERGED_MASK),
65 [MAX7323] = GROUP_A(IO_4P4O) | INT_CAPS(INT_INDEP_MASK),
66 [MAX7324] = GROUP_A(IO_8I) | GROUP_B(IO_8O) | INT_CAPS(INT_MERGED_MASK),
67 [MAX7325] = GROUP_A(IO_8P) | GROUP_B(IO_8O) | INT_CAPS(INT_NO_MASK),
68 [MAX7326] = GROUP_A(IO_4I4O) | GROUP_B(IO_8O) | INT_CAPS(INT_MERGED_MASK),
69 [MAX7327] = GROUP_A(IO_4P4O) | GROUP_B(IO_8O) | INT_CAPS(INT_NO_MASK),
70 };
71
72 static const struct i2c_device_id max732x_id[] = {
73 { "max7319", MAX7319 },
74 { "max7320", MAX7320 },
75 { "max7321", MAX7321 },
76 { "max7322", MAX7322 },
77 { "max7323", MAX7323 },
78 { "max7324", MAX7324 },
79 { "max7325", MAX7325 },
80 { "max7326", MAX7326 },
81 { "max7327", MAX7327 },
82 { },
83 };
84 MODULE_DEVICE_TABLE(i2c, max732x_id);
85
86 struct max732x_chip {
87 struct gpio_chip gpio_chip;
88
89 struct i2c_client *client; /* "main" client */
90 struct i2c_client *client_dummy;
91 struct i2c_client *client_group_a;
92 struct i2c_client *client_group_b;
93
94 unsigned int mask_group_a;
95 unsigned int dir_input;
96 unsigned int dir_output;
97
98 struct mutex lock;
99 uint8_t reg_out[2];
100
101 #ifdef CONFIG_GPIO_MAX732X_IRQ
102 struct mutex irq_lock;
103 int irq_base;
104 uint8_t irq_mask;
105 uint8_t irq_mask_cur;
106 uint8_t irq_trig_raise;
107 uint8_t irq_trig_fall;
108 uint8_t irq_features;
109 #endif
110 };
111
112 static int max732x_writeb(struct max732x_chip *chip, int group_a, uint8_t val)
113 {
114 struct i2c_client *client;
115 int ret;
116
117 client = group_a ? chip->client_group_a : chip->client_group_b;
118 ret = i2c_smbus_write_byte(client, val);
119 if (ret < 0) {
120 dev_err(&client->dev, "failed writing\n");
121 return ret;
122 }
123
124 return 0;
125 }
126
127 static int max732x_readb(struct max732x_chip *chip, int group_a, uint8_t *val)
128 {
129 struct i2c_client *client;
130 int ret;
131
132 client = group_a ? chip->client_group_a : chip->client_group_b;
133 ret = i2c_smbus_read_byte(client);
134 if (ret < 0) {
135 dev_err(&client->dev, "failed reading\n");
136 return ret;
137 }
138
139 *val = (uint8_t)ret;
140 return 0;
141 }
142
143 static inline int is_group_a(struct max732x_chip *chip, unsigned off)
144 {
145 return (1u << off) & chip->mask_group_a;
146 }
147
148 static int max732x_gpio_get_value(struct gpio_chip *gc, unsigned off)
149 {
150 struct max732x_chip *chip;
151 uint8_t reg_val;
152 int ret;
153
154 chip = container_of(gc, struct max732x_chip, gpio_chip);
155
156 ret = max732x_readb(chip, is_group_a(chip, off), &reg_val);
157 if (ret < 0)
158 return 0;
159
160 return reg_val & (1u << (off & 0x7));
161 }
162
163 static void max732x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
164 {
165 struct max732x_chip *chip;
166 uint8_t reg_out, mask = 1u << (off & 0x7);
167 int ret;
168
169 chip = container_of(gc, struct max732x_chip, gpio_chip);
170
171 mutex_lock(&chip->lock);
172
173 reg_out = (off > 7) ? chip->reg_out[1] : chip->reg_out[0];
174 reg_out = (val) ? reg_out | mask : reg_out & ~mask;
175
176 ret = max732x_writeb(chip, is_group_a(chip, off), reg_out);
177 if (ret < 0)
178 goto out;
179
180 /* update the shadow register then */
181 if (off > 7)
182 chip->reg_out[1] = reg_out;
183 else
184 chip->reg_out[0] = reg_out;
185 out:
186 mutex_unlock(&chip->lock);
187 }
188
189 static int max732x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
190 {
191 struct max732x_chip *chip;
192 unsigned int mask = 1u << off;
193
194 chip = container_of(gc, struct max732x_chip, gpio_chip);
195
196 if ((mask & chip->dir_input) == 0) {
197 dev_dbg(&chip->client->dev, "%s port %d is output only\n",
198 chip->client->name, off);
199 return -EACCES;
200 }
201
202 /*
203 * Open-drain pins must be set to high impedance (which is
204 * equivalent to output-high) to be turned into an input.
205 */
206 if ((mask & chip->dir_output))
207 max732x_gpio_set_value(gc, off, 1);
208
209 return 0;
210 }
211
212 static int max732x_gpio_direction_output(struct gpio_chip *gc,
213 unsigned off, int val)
214 {
215 struct max732x_chip *chip;
216 unsigned int mask = 1u << off;
217
218 chip = container_of(gc, struct max732x_chip, gpio_chip);
219
220 if ((mask & chip->dir_output) == 0) {
221 dev_dbg(&chip->client->dev, "%s port %d is input only\n",
222 chip->client->name, off);
223 return -EACCES;
224 }
225
226 max732x_gpio_set_value(gc, off, val);
227 return 0;
228 }
229
230 #ifdef CONFIG_GPIO_MAX732X_IRQ
231 static int max732x_writew(struct max732x_chip *chip, uint16_t val)
232 {
233 int ret;
234
235 val = cpu_to_le16(val);
236
237 ret = i2c_master_send(chip->client_group_a, (char *)&val, 2);
238 if (ret < 0) {
239 dev_err(&chip->client_group_a->dev, "failed writing\n");
240 return ret;
241 }
242
243 return 0;
244 }
245
246 static int max732x_readw(struct max732x_chip *chip, uint16_t *val)
247 {
248 int ret;
249
250 ret = i2c_master_recv(chip->client_group_a, (char *)val, 2);
251 if (ret < 0) {
252 dev_err(&chip->client_group_a->dev, "failed reading\n");
253 return ret;
254 }
255
256 *val = le16_to_cpu(*val);
257 return 0;
258 }
259
260 static void max732x_irq_update_mask(struct max732x_chip *chip)
261 {
262 uint16_t msg;
263
264 if (chip->irq_mask == chip->irq_mask_cur)
265 return;
266
267 chip->irq_mask = chip->irq_mask_cur;
268
269 if (chip->irq_features == INT_NO_MASK)
270 return;
271
272 mutex_lock(&chip->lock);
273
274 switch (chip->irq_features) {
275 case INT_INDEP_MASK:
276 msg = (chip->irq_mask << 8) | chip->reg_out[0];
277 max732x_writew(chip, msg);
278 break;
279
280 case INT_MERGED_MASK:
281 msg = chip->irq_mask | chip->reg_out[0];
282 max732x_writeb(chip, 1, (uint8_t)msg);
283 break;
284 }
285
286 mutex_unlock(&chip->lock);
287 }
288
289 static int max732x_gpio_to_irq(struct gpio_chip *gc, unsigned off)
290 {
291 struct max732x_chip *chip;
292
293 chip = container_of(gc, struct max732x_chip, gpio_chip);
294 return chip->irq_base + off;
295 }
296
297 static void max732x_irq_mask(unsigned int irq)
298 {
299 struct max732x_chip *chip = get_irq_chip_data(irq);
300
301 chip->irq_mask_cur &= ~(1 << (irq - chip->irq_base));
302 }
303
304 static void max732x_irq_unmask(unsigned int irq)
305 {
306 struct max732x_chip *chip = get_irq_chip_data(irq);
307
308 chip->irq_mask_cur |= 1 << (irq - chip->irq_base);
309 }
310
311 static void max732x_irq_bus_lock(unsigned int irq)
312 {
313 struct max732x_chip *chip = get_irq_chip_data(irq);
314
315 mutex_lock(&chip->irq_lock);
316 chip->irq_mask_cur = chip->irq_mask;
317 }
318
319 static void max732x_irq_bus_sync_unlock(unsigned int irq)
320 {
321 struct max732x_chip *chip = get_irq_chip_data(irq);
322
323 max732x_irq_update_mask(chip);
324 mutex_unlock(&chip->irq_lock);
325 }
326
327 static int max732x_irq_set_type(unsigned int irq, unsigned int type)
328 {
329 struct max732x_chip *chip = get_irq_chip_data(irq);
330 uint16_t off = irq - chip->irq_base;
331 uint16_t mask = 1 << off;
332
333 if (!(mask & chip->dir_input)) {
334 dev_dbg(&chip->client->dev, "%s port %d is output only\n",
335 chip->client->name, off);
336 return -EACCES;
337 }
338
339 if (!(type & IRQ_TYPE_EDGE_BOTH)) {
340 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
341 irq, type);
342 return -EINVAL;
343 }
344
345 if (type & IRQ_TYPE_EDGE_FALLING)
346 chip->irq_trig_fall |= mask;
347 else
348 chip->irq_trig_fall &= ~mask;
349
350 if (type & IRQ_TYPE_EDGE_RISING)
351 chip->irq_trig_raise |= mask;
352 else
353 chip->irq_trig_raise &= ~mask;
354
355 return max732x_gpio_direction_input(&chip->gpio_chip, off);
356 }
357
358 static struct irq_chip max732x_irq_chip = {
359 .name = "max732x",
360 .mask = max732x_irq_mask,
361 .unmask = max732x_irq_unmask,
362 .bus_lock = max732x_irq_bus_lock,
363 .bus_sync_unlock = max732x_irq_bus_sync_unlock,
364 .set_type = max732x_irq_set_type,
365 };
366
367 static uint8_t max732x_irq_pending(struct max732x_chip *chip)
368 {
369 uint8_t cur_stat;
370 uint8_t old_stat;
371 uint8_t trigger;
372 uint8_t pending;
373 uint16_t status;
374 int ret;
375
376 ret = max732x_readw(chip, &status);
377 if (ret)
378 return 0;
379
380 trigger = status >> 8;
381 trigger &= chip->irq_mask;
382
383 if (!trigger)
384 return 0;
385
386 cur_stat = status & 0xFF;
387 cur_stat &= chip->irq_mask;
388
389 old_stat = cur_stat ^ trigger;
390
391 pending = (old_stat & chip->irq_trig_fall) |
392 (cur_stat & chip->irq_trig_raise);
393 pending &= trigger;
394
395 return pending;
396 }
397
398 static irqreturn_t max732x_irq_handler(int irq, void *devid)
399 {
400 struct max732x_chip *chip = devid;
401 uint8_t pending;
402 uint8_t level;
403
404 pending = max732x_irq_pending(chip);
405
406 if (!pending)
407 return IRQ_HANDLED;
408
409 do {
410 level = __ffs(pending);
411 handle_nested_irq(level + chip->irq_base);
412
413 pending &= ~(1 << level);
414 } while (pending);
415
416 return IRQ_HANDLED;
417 }
418
419 static int max732x_irq_setup(struct max732x_chip *chip,
420 const struct i2c_device_id *id)
421 {
422 struct i2c_client *client = chip->client;
423 struct max732x_platform_data *pdata = client->dev.platform_data;
424 int has_irq = max732x_features[id->driver_data] >> 32;
425 int ret;
426
427 if (pdata->irq_base && has_irq != INT_NONE) {
428 int lvl;
429
430 chip->irq_base = pdata->irq_base;
431 chip->irq_features = has_irq;
432 mutex_init(&chip->irq_lock);
433
434 for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) {
435 int irq = lvl + chip->irq_base;
436
437 if (!(chip->dir_input & (1 << lvl)))
438 continue;
439
440 set_irq_chip_data(irq, chip);
441 set_irq_chip_and_handler(irq, &max732x_irq_chip,
442 handle_edge_irq);
443 set_irq_nested_thread(irq, 1);
444 #ifdef CONFIG_ARM
445 set_irq_flags(irq, IRQF_VALID);
446 #else
447 set_irq_noprobe(irq);
448 #endif
449 }
450
451 ret = request_threaded_irq(client->irq,
452 NULL,
453 max732x_irq_handler,
454 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
455 dev_name(&client->dev), chip);
456 if (ret) {
457 dev_err(&client->dev, "failed to request irq %d\n",
458 client->irq);
459 goto out_failed;
460 }
461
462 chip->gpio_chip.to_irq = max732x_gpio_to_irq;
463 }
464
465 return 0;
466
467 out_failed:
468 chip->irq_base = 0;
469 return ret;
470 }
471
472 static void max732x_irq_teardown(struct max732x_chip *chip)
473 {
474 if (chip->irq_base)
475 free_irq(chip->client->irq, chip);
476 }
477 #else /* CONFIG_GPIO_MAX732X_IRQ */
478 static int max732x_irq_setup(struct max732x_chip *chip,
479 const struct i2c_device_id *id)
480 {
481 struct i2c_client *client = chip->client;
482 struct max732x_platform_data *pdata = client->dev.platform_data;
483 int has_irq = max732x_features[id->driver_data] >> 32;
484
485 if (pdata->irq_base && has_irq != INT_NONE)
486 dev_warn(&client->dev, "interrupt support not compiled in\n");
487
488 return 0;
489 }
490
491 static void max732x_irq_teardown(struct max732x_chip *chip)
492 {
493 }
494 #endif
495
496 static int __devinit max732x_setup_gpio(struct max732x_chip *chip,
497 const struct i2c_device_id *id,
498 unsigned gpio_start)
499 {
500 struct gpio_chip *gc = &chip->gpio_chip;
501 uint32_t id_data = (uint32_t)max732x_features[id->driver_data];
502 int i, port = 0;
503
504 for (i = 0; i < 16; i++, id_data >>= 2) {
505 unsigned int mask = 1 << port;
506
507 switch (id_data & 0x3) {
508 case PORT_OUTPUT:
509 chip->dir_output |= mask;
510 break;
511 case PORT_INPUT:
512 chip->dir_input |= mask;
513 break;
514 case PORT_OPENDRAIN:
515 chip->dir_output |= mask;
516 chip->dir_input |= mask;
517 break;
518 default:
519 continue;
520 }
521
522 if (i < 8)
523 chip->mask_group_a |= mask;
524 port++;
525 }
526
527 if (chip->dir_input)
528 gc->direction_input = max732x_gpio_direction_input;
529 if (chip->dir_output) {
530 gc->direction_output = max732x_gpio_direction_output;
531 gc->set = max732x_gpio_set_value;
532 }
533 gc->get = max732x_gpio_get_value;
534 gc->can_sleep = 1;
535
536 gc->base = gpio_start;
537 gc->ngpio = port;
538 gc->label = chip->client->name;
539 gc->owner = THIS_MODULE;
540
541 return port;
542 }
543
544 static int __devinit max732x_probe(struct i2c_client *client,
545 const struct i2c_device_id *id)
546 {
547 struct max732x_platform_data *pdata;
548 struct max732x_chip *chip;
549 struct i2c_client *c;
550 uint16_t addr_a, addr_b;
551 int ret, nr_port;
552
553 pdata = client->dev.platform_data;
554 if (pdata == NULL) {
555 dev_dbg(&client->dev, "no platform data\n");
556 return -EINVAL;
557 }
558
559 chip = kzalloc(sizeof(struct max732x_chip), GFP_KERNEL);
560 if (chip == NULL)
561 return -ENOMEM;
562 chip->client = client;
563
564 nr_port = max732x_setup_gpio(chip, id, pdata->gpio_base);
565
566 addr_a = (client->addr & 0x0f) | 0x60;
567 addr_b = (client->addr & 0x0f) | 0x50;
568
569 switch (client->addr & 0x70) {
570 case 0x60:
571 chip->client_group_a = client;
572 if (nr_port > 8) {
573 c = i2c_new_dummy(client->adapter, addr_b);
574 chip->client_group_b = chip->client_dummy = c;
575 }
576 break;
577 case 0x50:
578 chip->client_group_b = client;
579 if (nr_port > 8) {
580 c = i2c_new_dummy(client->adapter, addr_a);
581 chip->client_group_a = chip->client_dummy = c;
582 }
583 break;
584 default:
585 dev_err(&client->dev, "invalid I2C address specified %02x\n",
586 client->addr);
587 ret = -EINVAL;
588 goto out_failed;
589 }
590
591 mutex_init(&chip->lock);
592
593 max732x_readb(chip, is_group_a(chip, 0), &chip->reg_out[0]);
594 if (nr_port > 8)
595 max732x_readb(chip, is_group_a(chip, 8), &chip->reg_out[1]);
596
597 ret = max732x_irq_setup(chip, id);
598 if (ret)
599 goto out_failed;
600
601 ret = gpiochip_add(&chip->gpio_chip);
602 if (ret)
603 goto out_failed;
604
605 if (pdata->setup) {
606 ret = pdata->setup(client, chip->gpio_chip.base,
607 chip->gpio_chip.ngpio, pdata->context);
608 if (ret < 0)
609 dev_warn(&client->dev, "setup failed, %d\n", ret);
610 }
611
612 i2c_set_clientdata(client, chip);
613 return 0;
614
615 out_failed:
616 max732x_irq_teardown(chip);
617 kfree(chip);
618 return ret;
619 }
620
621 static int __devexit max732x_remove(struct i2c_client *client)
622 {
623 struct max732x_platform_data *pdata = client->dev.platform_data;
624 struct max732x_chip *chip = i2c_get_clientdata(client);
625 int ret;
626
627 if (pdata->teardown) {
628 ret = pdata->teardown(client, chip->gpio_chip.base,
629 chip->gpio_chip.ngpio, pdata->context);
630 if (ret < 0) {
631 dev_err(&client->dev, "%s failed, %d\n",
632 "teardown", ret);
633 return ret;
634 }
635 }
636
637 ret = gpiochip_remove(&chip->gpio_chip);
638 if (ret) {
639 dev_err(&client->dev, "%s failed, %d\n",
640 "gpiochip_remove()", ret);
641 return ret;
642 }
643
644 max732x_irq_teardown(chip);
645
646 /* unregister any dummy i2c_client */
647 if (chip->client_dummy)
648 i2c_unregister_device(chip->client_dummy);
649
650 kfree(chip);
651 return 0;
652 }
653
654 static struct i2c_driver max732x_driver = {
655 .driver = {
656 .name = "max732x",
657 .owner = THIS_MODULE,
658 },
659 .probe = max732x_probe,
660 .remove = __devexit_p(max732x_remove),
661 .id_table = max732x_id,
662 };
663
664 static int __init max732x_init(void)
665 {
666 return i2c_add_driver(&max732x_driver);
667 }
668 /* register after i2c postcore initcall and before
669 * subsys initcalls that may rely on these GPIOs
670 */
671 subsys_initcall(max732x_init);
672
673 static void __exit max732x_exit(void)
674 {
675 i2c_del_driver(&max732x_driver);
676 }
677 module_exit(max732x_exit);
678
679 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
680 MODULE_DESCRIPTION("GPIO expander driver for MAX732X");
681 MODULE_LICENSE("GPL");
Tomato firmware and modifications.