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[karo-tx-linux.git] / drivers / mfd / tps6586x.c
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 #include <linux/regulator/of_regulator.h>
28
29 #include <linux/mfd/core.h>
30 #include <linux/mfd/tps6586x.h>
31
32 /* interrupt control registers */
33 #define TPS6586X_INT_ACK1       0xb5
34 #define TPS6586X_INT_ACK2       0xb6
35 #define TPS6586X_INT_ACK3       0xb7
36 #define TPS6586X_INT_ACK4       0xb8
37
38 /* interrupt mask registers */
39 #define TPS6586X_INT_MASK1      0xb0
40 #define TPS6586X_INT_MASK2      0xb1
41 #define TPS6586X_INT_MASK3      0xb2
42 #define TPS6586X_INT_MASK4      0xb3
43 #define TPS6586X_INT_MASK5      0xb4
44
45 /* device id */
46 #define TPS6586X_VERSIONCRC     0xcd
47
48 /* Maximum register */
49 #define TPS6586X_MAX_REGISTER   (TPS6586X_VERSIONCRC + 1)
50
51 struct tps6586x_irq_data {
52         u8      mask_reg;
53         u8      mask_mask;
54 };
55
56 #define TPS6586X_IRQ(_reg, _mask)                               \
57         {                                                       \
58                 .mask_reg = (_reg) - TPS6586X_INT_MASK1,        \
59                 .mask_mask = (_mask),                           \
60         }
61
62 static const struct tps6586x_irq_data tps6586x_irqs[] = {
63         [TPS6586X_INT_PLDO_0]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 0),
64         [TPS6586X_INT_PLDO_1]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 1),
65         [TPS6586X_INT_PLDO_2]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 2),
66         [TPS6586X_INT_PLDO_3]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 3),
67         [TPS6586X_INT_PLDO_4]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 4),
68         [TPS6586X_INT_PLDO_5]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 5),
69         [TPS6586X_INT_PLDO_6]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 6),
70         [TPS6586X_INT_PLDO_7]   = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 7),
71         [TPS6586X_INT_COMP_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 0),
72         [TPS6586X_INT_ADC]      = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 1),
73         [TPS6586X_INT_PLDO_8]   = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 2),
74         [TPS6586X_INT_PLDO_9]   = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 3),
75         [TPS6586X_INT_PSM_0]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 4),
76         [TPS6586X_INT_PSM_1]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 5),
77         [TPS6586X_INT_PSM_2]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 6),
78         [TPS6586X_INT_PSM_3]    = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 7),
79         [TPS6586X_INT_RTC_ALM1] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 4),
80         [TPS6586X_INT_ACUSB_OVP] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 0x03),
81         [TPS6586X_INT_USB_DET]  = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 2),
82         [TPS6586X_INT_AC_DET]   = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 3),
83         [TPS6586X_INT_BAT_DET]  = TPS6586X_IRQ(TPS6586X_INT_MASK3, 1 << 0),
84         [TPS6586X_INT_CHG_STAT] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 0xfc),
85         [TPS6586X_INT_CHG_TEMP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0x06),
86         [TPS6586X_INT_PP]       = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0xf0),
87         [TPS6586X_INT_RESUME]   = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 5),
88         [TPS6586X_INT_LOW_SYS]  = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 6),
89         [TPS6586X_INT_RTC_ALM2] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 1),
90 };
91
92 static struct mfd_cell tps6586x_cell[] = {
93         {
94                 .name = "tps6586x-gpio",
95         },
96         {
97                 .name = "tps6586x-rtc",
98         },
99         {
100                 .name = "tps6586x-onkey",
101         },
102 };
103
104 struct tps6586x {
105         struct device           *dev;
106         struct i2c_client       *client;
107         struct regmap           *regmap;
108
109         struct irq_chip         irq_chip;
110         struct mutex            irq_lock;
111         int                     irq_base;
112         u32                     irq_en;
113         u8                      mask_reg[5];
114 };
115
116 static inline struct tps6586x *dev_to_tps6586x(struct device *dev)
117 {
118         return i2c_get_clientdata(to_i2c_client(dev));
119 }
120
121 int tps6586x_write(struct device *dev, int reg, uint8_t val)
122 {
123         struct tps6586x *tps6586x = dev_to_tps6586x(dev);
124
125         return regmap_write(tps6586x->regmap, reg, val);
126 }
127 EXPORT_SYMBOL_GPL(tps6586x_write);
128
129 int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
130 {
131         struct tps6586x *tps6586x = dev_to_tps6586x(dev);
132
133         return regmap_bulk_write(tps6586x->regmap, reg, val, len);
134 }
135 EXPORT_SYMBOL_GPL(tps6586x_writes);
136
137 int tps6586x_read(struct device *dev, int reg, uint8_t *val)
138 {
139         struct tps6586x *tps6586x = dev_to_tps6586x(dev);
140         unsigned int rval;
141         int ret;
142
143         ret = regmap_read(tps6586x->regmap, reg, &rval);
144         if (!ret)
145                 *val = rval;
146         return ret;
147 }
148 EXPORT_SYMBOL_GPL(tps6586x_read);
149
150 int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
151 {
152         struct tps6586x *tps6586x = dev_to_tps6586x(dev);
153
154         return regmap_bulk_read(tps6586x->regmap, reg, val, len);
155 }
156 EXPORT_SYMBOL_GPL(tps6586x_reads);
157
158 int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
159 {
160         struct tps6586x *tps6586x = dev_to_tps6586x(dev);
161
162         return regmap_update_bits(tps6586x->regmap, reg, bit_mask, bit_mask);
163 }
164 EXPORT_SYMBOL_GPL(tps6586x_set_bits);
165
166 int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
167 {
168         struct tps6586x *tps6586x = dev_to_tps6586x(dev);
169
170         return regmap_update_bits(tps6586x->regmap, reg, bit_mask, 0);
171 }
172 EXPORT_SYMBOL_GPL(tps6586x_clr_bits);
173
174 int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
175 {
176         struct tps6586x *tps6586x = dev_to_tps6586x(dev);
177
178         return regmap_update_bits(tps6586x->regmap, reg, mask, val);
179 }
180 EXPORT_SYMBOL_GPL(tps6586x_update);
181
182 static int __remove_subdev(struct device *dev, void *unused)
183 {
184         platform_device_unregister(to_platform_device(dev));
185         return 0;
186 }
187
188 static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
189 {
190         return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
191 }
192
193 static void tps6586x_irq_lock(struct irq_data *data)
194 {
195         struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
196
197         mutex_lock(&tps6586x->irq_lock);
198 }
199
200 static void tps6586x_irq_enable(struct irq_data *irq_data)
201 {
202         struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
203         unsigned int __irq = irq_data->irq - tps6586x->irq_base;
204         const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
205
206         tps6586x->mask_reg[data->mask_reg] &= ~data->mask_mask;
207         tps6586x->irq_en |= (1 << __irq);
208 }
209
210 static void tps6586x_irq_disable(struct irq_data *irq_data)
211 {
212         struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
213
214         unsigned int __irq = irq_data->irq - tps6586x->irq_base;
215         const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
216
217         tps6586x->mask_reg[data->mask_reg] |= data->mask_mask;
218         tps6586x->irq_en &= ~(1 << __irq);
219 }
220
221 static void tps6586x_irq_sync_unlock(struct irq_data *data)
222 {
223         struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
224         int i;
225
226         for (i = 0; i < ARRAY_SIZE(tps6586x->mask_reg); i++) {
227                 int ret;
228                 ret = tps6586x_write(tps6586x->dev,
229                                             TPS6586X_INT_MASK1 + i,
230                                             tps6586x->mask_reg[i]);
231                 WARN_ON(ret);
232         }
233
234         mutex_unlock(&tps6586x->irq_lock);
235 }
236
237 static irqreturn_t tps6586x_irq(int irq, void *data)
238 {
239         struct tps6586x *tps6586x = data;
240         u32 acks;
241         int ret = 0;
242
243         ret = tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1,
244                              sizeof(acks), (uint8_t *)&acks);
245
246         if (ret < 0) {
247                 dev_err(tps6586x->dev, "failed to read interrupt status\n");
248                 return IRQ_NONE;
249         }
250
251         acks = le32_to_cpu(acks);
252
253         while (acks) {
254                 int i = __ffs(acks);
255
256                 if (tps6586x->irq_en & (1 << i))
257                         handle_nested_irq(tps6586x->irq_base + i);
258
259                 acks &= ~(1 << i);
260         }
261
262         return IRQ_HANDLED;
263 }
264
265 static int __devinit tps6586x_irq_init(struct tps6586x *tps6586x, int irq,
266                                        int irq_base)
267 {
268         int i, ret;
269         u8 tmp[4];
270
271         if (!irq_base) {
272                 dev_warn(tps6586x->dev, "No interrupt support on IRQ base\n");
273                 return -EINVAL;
274         }
275
276         mutex_init(&tps6586x->irq_lock);
277         for (i = 0; i < 5; i++) {
278                 tps6586x->mask_reg[i] = 0xff;
279                 tps6586x_write(tps6586x->dev, TPS6586X_INT_MASK1 + i, 0xff);
280         }
281
282         tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1, sizeof(tmp), tmp);
283
284         tps6586x->irq_base = irq_base;
285
286         tps6586x->irq_chip.name = "tps6586x";
287         tps6586x->irq_chip.irq_enable = tps6586x_irq_enable;
288         tps6586x->irq_chip.irq_disable = tps6586x_irq_disable;
289         tps6586x->irq_chip.irq_bus_lock = tps6586x_irq_lock;
290         tps6586x->irq_chip.irq_bus_sync_unlock = tps6586x_irq_sync_unlock;
291
292         for (i = 0; i < ARRAY_SIZE(tps6586x_irqs); i++) {
293                 int __irq = i + tps6586x->irq_base;
294                 irq_set_chip_data(__irq, tps6586x);
295                 irq_set_chip_and_handler(__irq, &tps6586x->irq_chip,
296                                          handle_simple_irq);
297                 irq_set_nested_thread(__irq, 1);
298 #ifdef CONFIG_ARM
299                 set_irq_flags(__irq, IRQF_VALID);
300 #endif
301         }
302
303         ret = request_threaded_irq(irq, NULL, tps6586x_irq, IRQF_ONESHOT,
304                                    "tps6586x", tps6586x);
305
306         if (!ret) {
307                 device_init_wakeup(tps6586x->dev, 1);
308                 enable_irq_wake(irq);
309         }
310
311         return ret;
312 }
313
314 static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
315                                           struct tps6586x_platform_data *pdata)
316 {
317         struct tps6586x_subdev_info *subdev;
318         struct platform_device *pdev;
319         int i, ret = 0;
320
321         for (i = 0; i < pdata->num_subdevs; i++) {
322                 subdev = &pdata->subdevs[i];
323
324                 pdev = platform_device_alloc(subdev->name, subdev->id);
325                 if (!pdev) {
326                         ret = -ENOMEM;
327                         goto failed;
328                 }
329
330                 pdev->dev.parent = tps6586x->dev;
331                 pdev->dev.platform_data = subdev->platform_data;
332                 pdev->dev.of_node = subdev->of_node;
333
334                 ret = platform_device_add(pdev);
335                 if (ret) {
336                         platform_device_put(pdev);
337                         goto failed;
338                 }
339         }
340         return 0;
341
342 failed:
343         tps6586x_remove_subdevs(tps6586x);
344         return ret;
345 }
346
347 #ifdef CONFIG_OF
348 static struct of_regulator_match tps6586x_matches[] = {
349         { .name = "sm0",     .driver_data = (void *)TPS6586X_ID_SM_0    },
350         { .name = "sm1",     .driver_data = (void *)TPS6586X_ID_SM_1    },
351         { .name = "sm2",     .driver_data = (void *)TPS6586X_ID_SM_2    },
352         { .name = "ldo0",    .driver_data = (void *)TPS6586X_ID_LDO_0   },
353         { .name = "ldo1",    .driver_data = (void *)TPS6586X_ID_LDO_1   },
354         { .name = "ldo2",    .driver_data = (void *)TPS6586X_ID_LDO_2   },
355         { .name = "ldo3",    .driver_data = (void *)TPS6586X_ID_LDO_3   },
356         { .name = "ldo4",    .driver_data = (void *)TPS6586X_ID_LDO_4   },
357         { .name = "ldo5",    .driver_data = (void *)TPS6586X_ID_LDO_5   },
358         { .name = "ldo6",    .driver_data = (void *)TPS6586X_ID_LDO_6   },
359         { .name = "ldo7",    .driver_data = (void *)TPS6586X_ID_LDO_7   },
360         { .name = "ldo8",    .driver_data = (void *)TPS6586X_ID_LDO_8   },
361         { .name = "ldo9",    .driver_data = (void *)TPS6586X_ID_LDO_9   },
362         { .name = "ldo_rtc", .driver_data = (void *)TPS6586X_ID_LDO_RTC },
363 };
364
365 static struct tps6586x_platform_data *tps6586x_parse_dt(struct i2c_client *client)
366 {
367         const unsigned int num = ARRAY_SIZE(tps6586x_matches);
368         struct device_node *np = client->dev.of_node;
369         struct tps6586x_platform_data *pdata;
370         struct tps6586x_subdev_info *devs;
371         struct device_node *regs;
372         unsigned int count;
373         unsigned int i, j;
374         int err;
375
376         regs = of_find_node_by_name(np, "regulators");
377         if (!regs)
378                 return NULL;
379
380         err = of_regulator_match(&client->dev, regs, tps6586x_matches, num);
381         if (err < 0) {
382                 of_node_put(regs);
383                 return NULL;
384         }
385
386         of_node_put(regs);
387         count = err;
388
389         devs = devm_kzalloc(&client->dev, count * sizeof(*devs), GFP_KERNEL);
390         if (!devs)
391                 return NULL;
392
393         for (i = 0, j = 0; i < num && j < count; i++) {
394                 if (!tps6586x_matches[i].init_data)
395                         continue;
396
397                 devs[j].name = "tps6586x-regulator";
398                 devs[j].platform_data = tps6586x_matches[i].init_data;
399                 devs[j].id = (int)tps6586x_matches[i].driver_data;
400                 devs[j].of_node = tps6586x_matches[i].of_node;
401                 j++;
402         }
403
404         pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
405         if (!pdata)
406                 return NULL;
407
408         pdata->num_subdevs = count;
409         pdata->subdevs = devs;
410         pdata->gpio_base = -1;
411         pdata->irq_base = -1;
412
413         return pdata;
414 }
415
416 static struct of_device_id tps6586x_of_match[] = {
417         { .compatible = "ti,tps6586x", },
418         { },
419 };
420 #else
421 static struct tps6586x_platform_data *tps6586x_parse_dt(struct i2c_client *client)
422 {
423         return NULL;
424 }
425 #endif
426
427 static bool is_volatile_reg(struct device *dev, unsigned int reg)
428 {
429         /* Cache all interrupt mask register */
430         if ((reg >= TPS6586X_INT_MASK1) && (reg <= TPS6586X_INT_MASK5))
431                 return false;
432
433         return true;
434 }
435
436 static const struct regmap_config tps6586x_regmap_config = {
437         .reg_bits = 8,
438         .val_bits = 8,
439         .max_register = TPS6586X_MAX_REGISTER - 1,
440         .volatile_reg = is_volatile_reg,
441         .cache_type = REGCACHE_RBTREE,
442 };
443
444 static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
445                                         const struct i2c_device_id *id)
446 {
447         struct tps6586x_platform_data *pdata = client->dev.platform_data;
448         struct tps6586x *tps6586x;
449         int ret;
450
451         if (!pdata && client->dev.of_node)
452                 pdata = tps6586x_parse_dt(client);
453
454         if (!pdata) {
455                 dev_err(&client->dev, "tps6586x requires platform data\n");
456                 return -ENOTSUPP;
457         }
458
459         ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
460         if (ret < 0) {
461                 dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
462                 return -EIO;
463         }
464
465         dev_info(&client->dev, "VERSIONCRC is %02x\n", ret);
466
467         tps6586x = devm_kzalloc(&client->dev, sizeof(*tps6586x), GFP_KERNEL);
468         if (tps6586x == NULL) {
469                 dev_err(&client->dev, "memory for tps6586x alloc failed\n");
470                 return -ENOMEM;
471         }
472
473         tps6586x->client = client;
474         tps6586x->dev = &client->dev;
475         i2c_set_clientdata(client, tps6586x);
476
477         tps6586x->regmap = devm_regmap_init_i2c(client,
478                                         &tps6586x_regmap_config);
479         if (IS_ERR(tps6586x->regmap)) {
480                 ret = PTR_ERR(tps6586x->regmap);
481                 dev_err(&client->dev, "regmap init failed: %d\n", ret);
482                 return ret;
483         }
484
485
486         if (client->irq) {
487                 ret = tps6586x_irq_init(tps6586x, client->irq,
488                                         pdata->irq_base);
489                 if (ret) {
490                         dev_err(&client->dev, "IRQ init failed: %d\n", ret);
491                         return ret;
492                 }
493         }
494
495         ret = mfd_add_devices(tps6586x->dev, -1,
496                               tps6586x_cell, ARRAY_SIZE(tps6586x_cell),
497                               NULL, 0, NULL);
498         if (ret < 0) {
499                 dev_err(&client->dev, "mfd_add_devices failed: %d\n", ret);
500                 goto err_mfd_add;
501         }
502
503         ret = tps6586x_add_subdevs(tps6586x, pdata);
504         if (ret) {
505                 dev_err(&client->dev, "add devices failed: %d\n", ret);
506                 goto err_add_devs;
507         }
508
509         return 0;
510
511 err_add_devs:
512         mfd_remove_devices(tps6586x->dev);
513 err_mfd_add:
514         if (client->irq)
515                 free_irq(client->irq, tps6586x);
516         return ret;
517 }
518
519 static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
520 {
521         struct tps6586x *tps6586x = i2c_get_clientdata(client);
522
523         tps6586x_remove_subdevs(tps6586x);
524         mfd_remove_devices(tps6586x->dev);
525         if (client->irq)
526                 free_irq(client->irq, tps6586x);
527         return 0;
528 }
529
530 static const struct i2c_device_id tps6586x_id_table[] = {
531         { "tps6586x", 0 },
532         { },
533 };
534 MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);
535
536 static struct i2c_driver tps6586x_driver = {
537         .driver = {
538                 .name   = "tps6586x",
539                 .owner  = THIS_MODULE,
540                 .of_match_table = of_match_ptr(tps6586x_of_match),
541         },
542         .probe          = tps6586x_i2c_probe,
543         .remove         = __devexit_p(tps6586x_i2c_remove),
544         .id_table       = tps6586x_id_table,
545 };
546
547 static int __init tps6586x_init(void)
548 {
549         return i2c_add_driver(&tps6586x_driver);
550 }
551 subsys_initcall(tps6586x_init);
552
553 static void __exit tps6586x_exit(void)
554 {
555         i2c_del_driver(&tps6586x_driver);
556 }
557 module_exit(tps6586x_exit);
558
559 MODULE_DESCRIPTION("TPS6586X core driver");
560 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
561 MODULE_LICENSE("GPL");