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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / mfd / tps6586x.c
bloba5ddf31b60ca89d3f228997f7da526b126449d94
1 /*
2 * Core driver for TI TPS6586x PMIC family
3 *
4 * Copyright (c) 2010 CompuLab Ltd.
5 * Mike Rapoport <mike@compulab.co.il>
6 *
7 * Based on da903x.c.
8 * Copyright (C) 2008 Compulab, Ltd.
9 * Mike Rapoport <mike@compulab.co.il>
10 * Copyright (C) 2006-2008 Marvell International Ltd.
11 * Eric Miao <eric.miao@marvell.com>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/interrupt.h>
19 #include <linux/irq.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/mutex.h>
23 #include <linux/slab.h>
24 #include <linux/gpio.h>
25 #include <linux/i2c.h>
26
27 #include <linux/mfd/core.h>
28 #include <linux/mfd/tps6586x.h>
29
30 /* GPIO control registers */
31 #define TPS6586X_GPIOSET1 0x5d
32 #define TPS6586X_GPIOSET2 0x5e
33
34 /* interrupt control registers */
35 #define TPS6586X_INT_ACK1 0xb5
36 #define TPS6586X_INT_ACK2 0xb6
37 #define TPS6586X_INT_ACK3 0xb7
38 #define TPS6586X_INT_ACK4 0xb8
39
40 /* interrupt mask registers */
41 #define TPS6586X_INT_MASK1 0xb0
42 #define TPS6586X_INT_MASK2 0xb1
43 #define TPS6586X_INT_MASK3 0xb2
44 #define TPS6586X_INT_MASK4 0xb3
45 #define TPS6586X_INT_MASK5 0xb4
46
47 /* device id */
48 #define TPS6586X_VERSIONCRC 0xcd
49
50 struct tps6586x_irq_data {
51 u8 mask_reg;
52 u8 mask_mask;
53 };
54
55 #define TPS6586X_IRQ(_reg, _mask) \
56 { \
57 .mask_reg = (_reg) - TPS6586X_INT_MASK1, \
58 .mask_mask = (_mask), \
59 }
60
61 static const struct tps6586x_irq_data tps6586x_irqs[] = {
62 [TPS6586X_INT_PLDO_0] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 0),
63 [TPS6586X_INT_PLDO_1] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 1),
64 [TPS6586X_INT_PLDO_2] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 2),
65 [TPS6586X_INT_PLDO_3] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 3),
66 [TPS6586X_INT_PLDO_4] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 4),
67 [TPS6586X_INT_PLDO_5] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 5),
68 [TPS6586X_INT_PLDO_6] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 6),
69 [TPS6586X_INT_PLDO_7] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 7),
70 [TPS6586X_INT_COMP_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 0),
71 [TPS6586X_INT_ADC] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 1),
72 [TPS6586X_INT_PLDO_8] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 2),
73 [TPS6586X_INT_PLDO_9] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 3),
74 [TPS6586X_INT_PSM_0] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 4),
75 [TPS6586X_INT_PSM_1] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 5),
76 [TPS6586X_INT_PSM_2] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 6),
77 [TPS6586X_INT_PSM_3] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 7),
78 [TPS6586X_INT_RTC_ALM1] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 4),
79 [TPS6586X_INT_ACUSB_OVP] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 0x03),
80 [TPS6586X_INT_USB_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 2),
81 [TPS6586X_INT_AC_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 3),
82 [TPS6586X_INT_BAT_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 1 << 0),
83 [TPS6586X_INT_CHG_STAT] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 0xfc),
84 [TPS6586X_INT_CHG_TEMP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0x06),
85 [TPS6586X_INT_PP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0xf0),
86 [TPS6586X_INT_RESUME] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 5),
87 [TPS6586X_INT_LOW_SYS] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 6),
88 [TPS6586X_INT_RTC_ALM2] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 1),
89 };
90
91 struct tps6586x {
92 struct mutex lock;
93 struct device *dev;
94 struct i2c_client *client;
95
96 struct gpio_chip gpio;
97 struct irq_chip irq_chip;
98 struct mutex irq_lock;
99 int irq_base;
100 u32 irq_en;
101 u8 mask_cache[5];
102 u8 mask_reg[5];
103 };
104
105 static inline int __tps6586x_read(struct i2c_client *client,
106 int reg, uint8_t *val)
107 {
108 int ret;
109
110 ret = i2c_smbus_read_byte_data(client, reg);
111 if (ret < 0) {
112 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
113 return ret;
114 }
115
116 *val = (uint8_t)ret;
117
118 return 0;
119 }
120
121 static inline int __tps6586x_reads(struct i2c_client *client, int reg,
122 int len, uint8_t *val)
123 {
124 int ret;
125
126 ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
127 if (ret < 0) {
128 dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
129 return ret;
130 }
131
132 return 0;
133 }
134
135 static inline int __tps6586x_write(struct i2c_client *client,
136 int reg, uint8_t val)
137 {
138 int ret;
139
140 ret = i2c_smbus_write_byte_data(client, reg, val);
141 if (ret < 0) {
142 dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
143 val, reg);
144 return ret;
145 }
146
147 return 0;
148 }
149
150 static inline int __tps6586x_writes(struct i2c_client *client, int reg,
151 int len, uint8_t *val)
152 {
153 int ret, i;
154
155 for (i = 0; i < len; i++) {
156 ret = __tps6586x_write(client, reg + i, *(val + i));
157 if (ret < 0)
158 return ret;
159 }
160
161 return 0;
162 }
163
164 int tps6586x_write(struct device *dev, int reg, uint8_t val)
165 {
166 return __tps6586x_write(to_i2c_client(dev), reg, val);
167 }
168 EXPORT_SYMBOL_GPL(tps6586x_write);
169
170 int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
171 {
172 return __tps6586x_writes(to_i2c_client(dev), reg, len, val);
173 }
174 EXPORT_SYMBOL_GPL(tps6586x_writes);
175
176 int tps6586x_read(struct device *dev, int reg, uint8_t *val)
177 {
178 return __tps6586x_read(to_i2c_client(dev), reg, val);
179 }
180 EXPORT_SYMBOL_GPL(tps6586x_read);
181
182 int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
183 {
184 return __tps6586x_reads(to_i2c_client(dev), reg, len, val);
185 }
186 EXPORT_SYMBOL_GPL(tps6586x_reads);
187
188 int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
189 {
190 struct tps6586x *tps6586x = dev_get_drvdata(dev);
191 uint8_t reg_val;
192 int ret = 0;
193
194 mutex_lock(&tps6586x->lock);
195
196 ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
197 if (ret)
198 goto out;
199
200 if ((reg_val & bit_mask) != bit_mask) {
201 reg_val |= bit_mask;
202 ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
203 }
204 out:
205 mutex_unlock(&tps6586x->lock);
206 return ret;
207 }
208 EXPORT_SYMBOL_GPL(tps6586x_set_bits);
209
210 int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
211 {
212 struct tps6586x *tps6586x = dev_get_drvdata(dev);
213 uint8_t reg_val;
214 int ret = 0;
215
216 mutex_lock(&tps6586x->lock);
217
218 ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
219 if (ret)
220 goto out;
221
222 if (reg_val & bit_mask) {
223 reg_val &= ~bit_mask;
224 ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
225 }
226 out:
227 mutex_unlock(&tps6586x->lock);
228 return ret;
229 }
230 EXPORT_SYMBOL_GPL(tps6586x_clr_bits);
231
232 int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
233 {
234 struct tps6586x *tps6586x = dev_get_drvdata(dev);
235 uint8_t reg_val;
236 int ret = 0;
237
238 mutex_lock(&tps6586x->lock);
239
240 ret = __tps6586x_read(tps6586x->client, reg, &reg_val);
241 if (ret)
242 goto out;
243
244 if ((reg_val & mask) != val) {
245 reg_val = (reg_val & ~mask) | val;
246 ret = __tps6586x_write(tps6586x->client, reg, reg_val);
247 }
248 out:
249 mutex_unlock(&tps6586x->lock);
250 return ret;
251 }
252 EXPORT_SYMBOL_GPL(tps6586x_update);
253
254 static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
255 {
256 struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
257 uint8_t val;
258 int ret;
259
260 ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val);
261 if (ret)
262 return ret;
263
264 return !!(val & (1 << offset));
265 }
266
267
268 static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset,
269 int value)
270 {
271 struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio);
272
273 tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET2,
274 value << offset, 1 << offset);
275 }
276
277 static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
278 int value)
279 {
280 struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
281 uint8_t val, mask;
282
283 tps6586x_gpio_set(gc, offset, value);
284
285 val = 0x1 << (offset * 2);
286 mask = 0x3 << (offset * 2);
287
288 return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask);
289 }
290
291 static int tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base)
292 {
293 if (!gpio_base)
294 return 0;
295
296 tps6586x->gpio.owner = THIS_MODULE;
297 tps6586x->gpio.label = tps6586x->client->name;
298 tps6586x->gpio.dev = tps6586x->dev;
299 tps6586x->gpio.base = gpio_base;
300 tps6586x->gpio.ngpio = 4;
301 tps6586x->gpio.can_sleep = 1;
302
303 /* FIXME: add handling of GPIOs as dedicated inputs */
304 tps6586x->gpio.direction_output = tps6586x_gpio_output;
305 tps6586x->gpio.set = tps6586x_gpio_set;
306 tps6586x->gpio.get = tps6586x_gpio_get;
307
308 return gpiochip_add(&tps6586x->gpio);
309 }
310
311 static int __remove_subdev(struct device *dev, void *unused)
312 {
313 platform_device_unregister(to_platform_device(dev));
314 return 0;
315 }
316
317 static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
318 {
319 return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
320 }
321
322 static void tps6586x_irq_lock(struct irq_data *data)
323 {
324 struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
325
326 mutex_lock(&tps6586x->irq_lock);
327 }
328
329 static void tps6586x_irq_enable(struct irq_data *irq_data)
330 {
331 struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
332 unsigned int __irq = irq_data->irq - tps6586x->irq_base;
333 const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
334
335 tps6586x->mask_reg[data->mask_reg] &= ~data->mask_mask;
336 tps6586x->irq_en |= (1 << __irq);
337 }
338
339 static void tps6586x_irq_disable(struct irq_data *irq_data)
340 {
341 struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
342
343 unsigned int __irq = irq_data->irq - tps6586x->irq_base;
344 const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
345
346 tps6586x->mask_reg[data->mask_reg] |= data->mask_mask;
347 tps6586x->irq_en &= ~(1 << __irq);
348 }
349
350 static void tps6586x_irq_sync_unlock(struct irq_data *data)
351 {
352 struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
353 int i;
354
355 for (i = 0; i < ARRAY_SIZE(tps6586x->mask_reg); i++) {
356 if (tps6586x->mask_reg[i] != tps6586x->mask_cache[i]) {
357 if (!WARN_ON(tps6586x_write(tps6586x->dev,
358 TPS6586X_INT_MASK1 + i,
359 tps6586x->mask_reg[i])))
360 tps6586x->mask_cache[i] = tps6586x->mask_reg[i];
361 }
362 }
363
364 mutex_unlock(&tps6586x->irq_lock);
365 }
366
367 static irqreturn_t tps6586x_irq(int irq, void *data)
368 {
369 struct tps6586x *tps6586x = data;
370 u32 acks;
371 int ret = 0;
372
373 ret = tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1,
374 sizeof(acks), (uint8_t *)&acks);
375
376 if (ret < 0) {
377 dev_err(tps6586x->dev, "failed to read interrupt status\n");
378 return IRQ_NONE;
379 }
380
381 acks = le32_to_cpu(acks);
382
383 while (acks) {
384 int i = __ffs(acks);
385
386 if (tps6586x->irq_en & (1 << i))
387 handle_nested_irq(tps6586x->irq_base + i);
388
389 acks &= ~(1 << i);
390 }
391
392 return IRQ_HANDLED;
393 }
394
395 static int __devinit tps6586x_irq_init(struct tps6586x *tps6586x, int irq,
396 int irq_base)
397 {
398 int i, ret;
399 u8 tmp[4];
400
401 if (!irq_base) {
402 dev_warn(tps6586x->dev, "No interrupt support on IRQ base\n");
403 return -EINVAL;
404 }
405
406 mutex_init(&tps6586x->irq_lock);
407 for (i = 0; i < 5; i++) {
408 tps6586x->mask_cache[i] = 0xff;
409 tps6586x->mask_reg[i] = 0xff;
410 tps6586x_write(tps6586x->dev, TPS6586X_INT_MASK1 + i, 0xff);
411 }
412
413 tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1, sizeof(tmp), tmp);
414
415 tps6586x->irq_base = irq_base;
416
417 tps6586x->irq_chip.name = "tps6586x";
418 tps6586x->irq_chip.irq_enable = tps6586x_irq_enable;
419 tps6586x->irq_chip.irq_disable = tps6586x_irq_disable;
420 tps6586x->irq_chip.irq_bus_lock = tps6586x_irq_lock;
421 tps6586x->irq_chip.irq_bus_sync_unlock = tps6586x_irq_sync_unlock;
422
423 for (i = 0; i < ARRAY_SIZE(tps6586x_irqs); i++) {
424 int __irq = i + tps6586x->irq_base;
425 irq_set_chip_data(__irq, tps6586x);
426 irq_set_chip_and_handler(__irq, &tps6586x->irq_chip,
427 handle_simple_irq);
428 irq_set_nested_thread(__irq, 1);
429 #ifdef CONFIG_ARM
430 set_irq_flags(__irq, IRQF_VALID);
431 #endif
432 }
433
434 ret = request_threaded_irq(irq, NULL, tps6586x_irq, IRQF_ONESHOT,
435 "tps6586x", tps6586x);
436
437 if (!ret) {
438 device_init_wakeup(tps6586x->dev, 1);
439 enable_irq_wake(irq);
440 }
441
442 return ret;
443 }
444
445 static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
446 struct tps6586x_platform_data *pdata)
447 {
448 struct tps6586x_subdev_info *subdev;
449 struct platform_device *pdev;
450 int i, ret = 0;
451
452 for (i = 0; i < pdata->num_subdevs; i++) {
453 subdev = &pdata->subdevs[i];
454
455 pdev = platform_device_alloc(subdev->name, subdev->id);
456 if (!pdev) {
457 ret = -ENOMEM;
458 goto failed;
459 }
460
461 pdev->dev.parent = tps6586x->dev;
462 pdev->dev.platform_data = subdev->platform_data;
463
464 ret = platform_device_add(pdev);
465 if (ret) {
466 platform_device_put(pdev);
467 goto failed;
468 }
469 }
470 return 0;
471
472 failed:
473 tps6586x_remove_subdevs(tps6586x);
474 return ret;
475 }
476
477 static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
478 const struct i2c_device_id *id)
479 {
480 struct tps6586x_platform_data *pdata = client->dev.platform_data;
481 struct tps6586x *tps6586x;
482 int ret;
483
484 if (!pdata) {
485 dev_err(&client->dev, "tps6586x requires platform data\n");
486 return -ENOTSUPP;
487 }
488
489 ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
490 if (ret < 0) {
491 dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
492 return -EIO;
493 }
494
495 dev_info(&client->dev, "VERSIONCRC is %02x\n", ret);
496
497 tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL);
498 if (tps6586x == NULL)
499 return -ENOMEM;
500
501 tps6586x->client = client;
502 tps6586x->dev = &client->dev;
503 i2c_set_clientdata(client, tps6586x);
504
505 mutex_init(&tps6586x->lock);
506
507 if (client->irq) {
508 ret = tps6586x_irq_init(tps6586x, client->irq,
509 pdata->irq_base);
510 if (ret) {
511 dev_err(&client->dev, "IRQ init failed: %d\n", ret);
512 goto err_irq_init;
513 }
514 }
515
516 ret = tps6586x_gpio_init(tps6586x, pdata->gpio_base);
517 if (ret) {
518 dev_err(&client->dev, "GPIO registration failed: %d\n", ret);
519 goto err_gpio_init;
520 }
521
522 ret = tps6586x_add_subdevs(tps6586x, pdata);
523 if (ret) {
524 dev_err(&client->dev, "add devices failed: %d\n", ret);
525 goto err_add_devs;
526 }
527
528 return 0;
529
530 err_add_devs:
531 if (pdata->gpio_base) {
532 ret = gpiochip_remove(&tps6586x->gpio);
533 if (ret)
534 dev_err(&client->dev, "Can't remove gpio chip: %d\n",
535 ret);
536 }
537 err_gpio_init:
538 if (client->irq)
539 free_irq(client->irq, tps6586x);
540 err_irq_init:
541 kfree(tps6586x);
542 return ret;
543 }
544
545 static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
546 {
547 struct tps6586x *tps6586x = i2c_get_clientdata(client);
548 struct tps6586x_platform_data *pdata = client->dev.platform_data;
549 int ret;
550
551 if (client->irq)
552 free_irq(client->irq, tps6586x);
553
554 if (pdata->gpio_base) {
555 ret = gpiochip_remove(&tps6586x->gpio);
556 if (ret)
557 dev_err(&client->dev, "Can't remove gpio chip: %d\n",
558 ret);
559 }
560
561 tps6586x_remove_subdevs(tps6586x);
562 kfree(tps6586x);
563 return 0;
564 }
565
566 static const struct i2c_device_id tps6586x_id_table[] = {
567 { "tps6586x", 0 },
568 { },
569 };
570 MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);
571
572 static struct i2c_driver tps6586x_driver = {
573 .driver = {
574 .name = "tps6586x",
575 .owner = THIS_MODULE,
576 },
577 .probe = tps6586x_i2c_probe,
578 .remove = __devexit_p(tps6586x_i2c_remove),
579 .id_table = tps6586x_id_table,
580 };
581
582 static int __init tps6586x_init(void)
583 {
584 return i2c_add_driver(&tps6586x_driver);
585 }
586 subsys_initcall(tps6586x_init);
587
588 static void __exit tps6586x_exit(void)
589 {
590 i2c_del_driver(&tps6586x_driver);
591 }
592 module_exit(tps6586x_exit);
593
594 MODULE_DESCRIPTION("TPS6586X core driver");
595 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
596 MODULE_LICENSE("GPL");