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Merge tag 'regulator-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[linux-2.6/btrfs-unstable.git] / drivers / mfd / tps6586x.c
blob87ba7ada3bbc8a72392745cdc3400fb541e8056c
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/err.h>
25 #include <linux/i2c.h>
26 #include <linux/regmap.h>
27
28 #include <linux/mfd/core.h>
29 #include <linux/mfd/tps6586x.h>
30
31 #define TPS6586X_SUPPLYENE 0x14
32 #define EXITSLREQ_BIT BIT(1)
33 #define SLEEP_MODE_BIT BIT(3)
34
35 /* interrupt control registers */
36 #define TPS6586X_INT_ACK1 0xb5
37 #define TPS6586X_INT_ACK2 0xb6
38 #define TPS6586X_INT_ACK3 0xb7
39 #define TPS6586X_INT_ACK4 0xb8
40
41 /* interrupt mask registers */
42 #define TPS6586X_INT_MASK1 0xb0
43 #define TPS6586X_INT_MASK2 0xb1
44 #define TPS6586X_INT_MASK3 0xb2
45 #define TPS6586X_INT_MASK4 0xb3
46 #define TPS6586X_INT_MASK5 0xb4
47
48 /* device id */
49 #define TPS6586X_VERSIONCRC 0xcd
50
51 /* Maximum register */
52 #define TPS6586X_MAX_REGISTER (TPS6586X_VERSIONCRC + 1)
53
54 struct tps6586x_irq_data {
55 u8 mask_reg;
56 u8 mask_mask;
57 };
58
59 #define TPS6586X_IRQ(_reg, _mask) \
60 { \
61 .mask_reg = (_reg) - TPS6586X_INT_MASK1, \
62 .mask_mask = (_mask), \
63 }
64
65 static const struct tps6586x_irq_data tps6586x_irqs[] = {
66 [TPS6586X_INT_PLDO_0] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 0),
67 [TPS6586X_INT_PLDO_1] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 1),
68 [TPS6586X_INT_PLDO_2] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 2),
69 [TPS6586X_INT_PLDO_3] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 3),
70 [TPS6586X_INT_PLDO_4] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 4),
71 [TPS6586X_INT_PLDO_5] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 5),
72 [TPS6586X_INT_PLDO_6] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 6),
73 [TPS6586X_INT_PLDO_7] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 7),
74 [TPS6586X_INT_COMP_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 0),
75 [TPS6586X_INT_ADC] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 1),
76 [TPS6586X_INT_PLDO_8] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 2),
77 [TPS6586X_INT_PLDO_9] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 3),
78 [TPS6586X_INT_PSM_0] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 4),
79 [TPS6586X_INT_PSM_1] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 5),
80 [TPS6586X_INT_PSM_2] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 6),
81 [TPS6586X_INT_PSM_3] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 7),
82 [TPS6586X_INT_RTC_ALM1] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 4),
83 [TPS6586X_INT_ACUSB_OVP] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 0x03),
84 [TPS6586X_INT_USB_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 2),
85 [TPS6586X_INT_AC_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 3),
86 [TPS6586X_INT_BAT_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 1 << 0),
87 [TPS6586X_INT_CHG_STAT] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 0xfc),
88 [TPS6586X_INT_CHG_TEMP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0x06),
89 [TPS6586X_INT_PP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0xf0),
90 [TPS6586X_INT_RESUME] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 5),
91 [TPS6586X_INT_LOW_SYS] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 6),
92 [TPS6586X_INT_RTC_ALM2] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 1),
93 };
94
95 static struct mfd_cell tps6586x_cell[] = {
96 {
97 .name = "tps6586x-gpio",
98 },
99 {
100 .name = "tps6586x-pmic",
101 },
102 {
103 .name = "tps6586x-rtc",
104 },
105 {
106 .name = "tps6586x-onkey",
107 },
108 };
109
110 struct tps6586x {
111 struct device *dev;
112 struct i2c_client *client;
113 struct regmap *regmap;
114
115 struct irq_chip irq_chip;
116 struct mutex irq_lock;
117 int irq_base;
118 u32 irq_en;
119 u8 mask_reg[5];
120 };
121
122 static inline struct tps6586x *dev_to_tps6586x(struct device *dev)
123 {
124 return i2c_get_clientdata(to_i2c_client(dev));
125 }
126
127 int tps6586x_write(struct device *dev, int reg, uint8_t val)
128 {
129 struct tps6586x *tps6586x = dev_to_tps6586x(dev);
130
131 return regmap_write(tps6586x->regmap, reg, val);
132 }
133 EXPORT_SYMBOL_GPL(tps6586x_write);
134
135 int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
136 {
137 struct tps6586x *tps6586x = dev_to_tps6586x(dev);
138
139 return regmap_bulk_write(tps6586x->regmap, reg, val, len);
140 }
141 EXPORT_SYMBOL_GPL(tps6586x_writes);
142
143 int tps6586x_read(struct device *dev, int reg, uint8_t *val)
144 {
145 struct tps6586x *tps6586x = dev_to_tps6586x(dev);
146 unsigned int rval;
147 int ret;
148
149 ret = regmap_read(tps6586x->regmap, reg, &rval);
150 if (!ret)
151 *val = rval;
152 return ret;
153 }
154 EXPORT_SYMBOL_GPL(tps6586x_read);
155
156 int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
157 {
158 struct tps6586x *tps6586x = dev_to_tps6586x(dev);
159
160 return regmap_bulk_read(tps6586x->regmap, reg, val, len);
161 }
162 EXPORT_SYMBOL_GPL(tps6586x_reads);
163
164 int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
165 {
166 struct tps6586x *tps6586x = dev_to_tps6586x(dev);
167
168 return regmap_update_bits(tps6586x->regmap, reg, bit_mask, bit_mask);
169 }
170 EXPORT_SYMBOL_GPL(tps6586x_set_bits);
171
172 int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
173 {
174 struct tps6586x *tps6586x = dev_to_tps6586x(dev);
175
176 return regmap_update_bits(tps6586x->regmap, reg, bit_mask, 0);
177 }
178 EXPORT_SYMBOL_GPL(tps6586x_clr_bits);
179
180 int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
181 {
182 struct tps6586x *tps6586x = dev_to_tps6586x(dev);
183
184 return regmap_update_bits(tps6586x->regmap, reg, mask, val);
185 }
186 EXPORT_SYMBOL_GPL(tps6586x_update);
187
188 static int __remove_subdev(struct device *dev, void *unused)
189 {
190 platform_device_unregister(to_platform_device(dev));
191 return 0;
192 }
193
194 static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
195 {
196 return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
197 }
198
199 static void tps6586x_irq_lock(struct irq_data *data)
200 {
201 struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
202
203 mutex_lock(&tps6586x->irq_lock);
204 }
205
206 static void tps6586x_irq_enable(struct irq_data *irq_data)
207 {
208 struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
209 unsigned int __irq = irq_data->irq - tps6586x->irq_base;
210 const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
211
212 tps6586x->mask_reg[data->mask_reg] &= ~data->mask_mask;
213 tps6586x->irq_en |= (1 << __irq);
214 }
215
216 static void tps6586x_irq_disable(struct irq_data *irq_data)
217 {
218 struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
219
220 unsigned int __irq = irq_data->irq - tps6586x->irq_base;
221 const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
222
223 tps6586x->mask_reg[data->mask_reg] |= data->mask_mask;
224 tps6586x->irq_en &= ~(1 << __irq);
225 }
226
227 static void tps6586x_irq_sync_unlock(struct irq_data *data)
228 {
229 struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
230 int i;
231
232 for (i = 0; i < ARRAY_SIZE(tps6586x->mask_reg); i++) {
233 int ret;
234 ret = tps6586x_write(tps6586x->dev,
235 TPS6586X_INT_MASK1 + i,
236 tps6586x->mask_reg[i]);
237 WARN_ON(ret);
238 }
239
240 mutex_unlock(&tps6586x->irq_lock);
241 }
242
243 static irqreturn_t tps6586x_irq(int irq, void *data)
244 {
245 struct tps6586x *tps6586x = data;
246 u32 acks;
247 int ret = 0;
248
249 ret = tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1,
250 sizeof(acks), (uint8_t *)&acks);
251
252 if (ret < 0) {
253 dev_err(tps6586x->dev, "failed to read interrupt status\n");
254 return IRQ_NONE;
255 }
256
257 acks = le32_to_cpu(acks);
258
259 while (acks) {
260 int i = __ffs(acks);
261
262 if (tps6586x->irq_en & (1 << i))
263 handle_nested_irq(tps6586x->irq_base + i);
264
265 acks &= ~(1 << i);
266 }
267
268 return IRQ_HANDLED;
269 }
270
271 static int tps6586x_irq_init(struct tps6586x *tps6586x, int irq,
272 int irq_base)
273 {
274 int i, ret;
275 u8 tmp[4];
276
277 if (!irq_base) {
278 dev_warn(tps6586x->dev, "No interrupt support on IRQ base\n");
279 return -EINVAL;
280 }
281
282 mutex_init(&tps6586x->irq_lock);
283 for (i = 0; i < 5; i++) {
284 tps6586x->mask_reg[i] = 0xff;
285 tps6586x_write(tps6586x->dev, TPS6586X_INT_MASK1 + i, 0xff);
286 }
287
288 tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1, sizeof(tmp), tmp);
289
290 tps6586x->irq_base = irq_base;
291
292 tps6586x->irq_chip.name = "tps6586x";
293 tps6586x->irq_chip.irq_enable = tps6586x_irq_enable;
294 tps6586x->irq_chip.irq_disable = tps6586x_irq_disable;
295 tps6586x->irq_chip.irq_bus_lock = tps6586x_irq_lock;
296 tps6586x->irq_chip.irq_bus_sync_unlock = tps6586x_irq_sync_unlock;
297
298 for (i = 0; i < ARRAY_SIZE(tps6586x_irqs); i++) {
299 int __irq = i + tps6586x->irq_base;
300 irq_set_chip_data(__irq, tps6586x);
301 irq_set_chip_and_handler(__irq, &tps6586x->irq_chip,
302 handle_simple_irq);
303 irq_set_nested_thread(__irq, 1);
304 #ifdef CONFIG_ARM
305 set_irq_flags(__irq, IRQF_VALID);
306 #endif
307 }
308
309 ret = request_threaded_irq(irq, NULL, tps6586x_irq, IRQF_ONESHOT,
310 "tps6586x", tps6586x);
311
312 if (!ret) {
313 device_init_wakeup(tps6586x->dev, 1);
314 enable_irq_wake(irq);
315 }
316
317 return ret;
318 }
319
320 static int tps6586x_add_subdevs(struct tps6586x *tps6586x,
321 struct tps6586x_platform_data *pdata)
322 {
323 struct tps6586x_subdev_info *subdev;
324 struct platform_device *pdev;
325 int i, ret = 0;
326
327 for (i = 0; i < pdata->num_subdevs; i++) {
328 subdev = &pdata->subdevs[i];
329
330 pdev = platform_device_alloc(subdev->name, subdev->id);
331 if (!pdev) {
332 ret = -ENOMEM;
333 goto failed;
334 }
335
336 pdev->dev.parent = tps6586x->dev;
337 pdev->dev.platform_data = subdev->platform_data;
338 pdev->dev.of_node = subdev->of_node;
339
340 ret = platform_device_add(pdev);
341 if (ret) {
342 platform_device_put(pdev);
343 goto failed;
344 }
345 }
346 return 0;
347
348 failed:
349 tps6586x_remove_subdevs(tps6586x);
350 return ret;
351 }
352
353 #ifdef CONFIG_OF
354 static struct tps6586x_platform_data *tps6586x_parse_dt(struct i2c_client *client)
355 {
356 struct device_node *np = client->dev.of_node;
357 struct tps6586x_platform_data *pdata;
358
359 pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
360 if (!pdata) {
361 dev_err(&client->dev, "Memory allocation failed\n");
362 return NULL;
363 }
364
365 pdata->num_subdevs = 0;
366 pdata->subdevs = NULL;
367 pdata->gpio_base = -1;
368 pdata->irq_base = -1;
369 pdata->pm_off = of_property_read_bool(np, "ti,system-power-controller");
370
371 return pdata;
372 }
373
374 static struct of_device_id tps6586x_of_match[] = {
375 { .compatible = "ti,tps6586x", },
376 { },
377 };
378 #else
379 static struct tps6586x_platform_data *tps6586x_parse_dt(struct i2c_client *client)
380 {
381 return NULL;
382 }
383 #endif
384
385 static bool is_volatile_reg(struct device *dev, unsigned int reg)
386 {
387 /* Cache all interrupt mask register */
388 if ((reg >= TPS6586X_INT_MASK1) && (reg <= TPS6586X_INT_MASK5))
389 return false;
390
391 return true;
392 }
393
394 static const struct regmap_config tps6586x_regmap_config = {
395 .reg_bits = 8,
396 .val_bits = 8,
397 .max_register = TPS6586X_MAX_REGISTER - 1,
398 .volatile_reg = is_volatile_reg,
399 .cache_type = REGCACHE_RBTREE,
400 };
401
402 static struct device *tps6586x_dev;
403 static void tps6586x_power_off(void)
404 {
405 if (tps6586x_clr_bits(tps6586x_dev, TPS6586X_SUPPLYENE, EXITSLREQ_BIT))
406 return;
407
408 tps6586x_set_bits(tps6586x_dev, TPS6586X_SUPPLYENE, SLEEP_MODE_BIT);
409 }
410
411 static int tps6586x_i2c_probe(struct i2c_client *client,
412 const struct i2c_device_id *id)
413 {
414 struct tps6586x_platform_data *pdata = client->dev.platform_data;
415 struct tps6586x *tps6586x;
416 int ret;
417
418 if (!pdata && client->dev.of_node)
419 pdata = tps6586x_parse_dt(client);
420
421 if (!pdata) {
422 dev_err(&client->dev, "tps6586x requires platform data\n");
423 return -ENOTSUPP;
424 }
425
426 ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
427 if (ret < 0) {
428 dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
429 return -EIO;
430 }
431
432 dev_info(&client->dev, "VERSIONCRC is %02x\n", ret);
433
434 tps6586x = devm_kzalloc(&client->dev, sizeof(*tps6586x), GFP_KERNEL);
435 if (tps6586x == NULL) {
436 dev_err(&client->dev, "memory for tps6586x alloc failed\n");
437 return -ENOMEM;
438 }
439
440 tps6586x->client = client;
441 tps6586x->dev = &client->dev;
442 i2c_set_clientdata(client, tps6586x);
443
444 tps6586x->regmap = devm_regmap_init_i2c(client,
445 &tps6586x_regmap_config);
446 if (IS_ERR(tps6586x->regmap)) {
447 ret = PTR_ERR(tps6586x->regmap);
448 dev_err(&client->dev, "regmap init failed: %d\n", ret);
449 return ret;
450 }
451
452
453 if (client->irq) {
454 ret = tps6586x_irq_init(tps6586x, client->irq,
455 pdata->irq_base);
456 if (ret) {
457 dev_err(&client->dev, "IRQ init failed: %d\n", ret);
458 return ret;
459 }
460 }
461
462 ret = mfd_add_devices(tps6586x->dev, -1,
463 tps6586x_cell, ARRAY_SIZE(tps6586x_cell),
464 NULL, 0, NULL);
465 if (ret < 0) {
466 dev_err(&client->dev, "mfd_add_devices failed: %d\n", ret);
467 goto err_mfd_add;
468 }
469
470 ret = tps6586x_add_subdevs(tps6586x, pdata);
471 if (ret) {
472 dev_err(&client->dev, "add devices failed: %d\n", ret);
473 goto err_add_devs;
474 }
475
476 if (pdata->pm_off && !pm_power_off) {
477 tps6586x_dev = &client->dev;
478 pm_power_off = tps6586x_power_off;
479 }
480
481 return 0;
482
483 err_add_devs:
484 mfd_remove_devices(tps6586x->dev);
485 err_mfd_add:
486 if (client->irq)
487 free_irq(client->irq, tps6586x);
488 return ret;
489 }
490
491 static int tps6586x_i2c_remove(struct i2c_client *client)
492 {
493 struct tps6586x *tps6586x = i2c_get_clientdata(client);
494
495 tps6586x_remove_subdevs(tps6586x);
496 mfd_remove_devices(tps6586x->dev);
497 if (client->irq)
498 free_irq(client->irq, tps6586x);
499 return 0;
500 }
501
502 static const struct i2c_device_id tps6586x_id_table[] = {
503 { "tps6586x", 0 },
504 { },
505 };
506 MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);
507
508 static struct i2c_driver tps6586x_driver = {
509 .driver = {
510 .name = "tps6586x",
511 .owner = THIS_MODULE,
512 .of_match_table = of_match_ptr(tps6586x_of_match),
513 },
514 .probe = tps6586x_i2c_probe,
515 .remove = tps6586x_i2c_remove,
516 .id_table = tps6586x_id_table,
517 };
518
519 static int __init tps6586x_init(void)
520 {
521 return i2c_add_driver(&tps6586x_driver);
522 }
523 subsys_initcall(tps6586x_init);
524
525 static void __exit tps6586x_exit(void)
526 {
527 i2c_del_driver(&tps6586x_driver);
528 }
529 module_exit(tps6586x_exit);
530
531 MODULE_DESCRIPTION("TPS6586X core driver");
532 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
533 MODULE_LICENSE("GPL");
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