60a7ca5409e9766bfe829c0d581d4dca910acc98
[linux-2.6.git] / drivers / regulator / tps65023-regulator.c
1 /*
2  * tps65023-regulator.c
3  *
4  * Supports TPS65023 Regulator
5  *
6  * Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.com/
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation version 2.
11  *
12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
13  * whether express or implied; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/err.h>
22 #include <linux/platform_device.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/machine.h>
25 #include <linux/i2c.h>
26 #include <linux/delay.h>
27 #include <linux/slab.h>
28
29 /* Register definitions */
30 #define TPS65023_REG_VERSION            0
31 #define TPS65023_REG_PGOODZ             1
32 #define TPS65023_REG_MASK               2
33 #define TPS65023_REG_REG_CTRL           3
34 #define TPS65023_REG_CON_CTRL           4
35 #define TPS65023_REG_CON_CTRL2          5
36 #define TPS65023_REG_DEF_CORE           6
37 #define TPS65023_REG_DEFSLEW            7
38 #define TPS65023_REG_LDO_CTRL           8
39
40 /* PGOODZ bitfields */
41 #define TPS65023_PGOODZ_PWRFAILZ        BIT(7)
42 #define TPS65023_PGOODZ_LOWBATTZ        BIT(6)
43 #define TPS65023_PGOODZ_VDCDC1          BIT(5)
44 #define TPS65023_PGOODZ_VDCDC2          BIT(4)
45 #define TPS65023_PGOODZ_VDCDC3          BIT(3)
46 #define TPS65023_PGOODZ_LDO2            BIT(2)
47 #define TPS65023_PGOODZ_LDO1            BIT(1)
48
49 /* MASK bitfields */
50 #define TPS65023_MASK_PWRFAILZ          BIT(7)
51 #define TPS65023_MASK_LOWBATTZ          BIT(6)
52 #define TPS65023_MASK_VDCDC1            BIT(5)
53 #define TPS65023_MASK_VDCDC2            BIT(4)
54 #define TPS65023_MASK_VDCDC3            BIT(3)
55 #define TPS65023_MASK_LDO2              BIT(2)
56 #define TPS65023_MASK_LDO1              BIT(1)
57
58 /* REG_CTRL bitfields */
59 #define TPS65023_REG_CTRL_VDCDC1_EN     BIT(5)
60 #define TPS65023_REG_CTRL_VDCDC2_EN     BIT(4)
61 #define TPS65023_REG_CTRL_VDCDC3_EN     BIT(3)
62 #define TPS65023_REG_CTRL_LDO2_EN       BIT(2)
63 #define TPS65023_REG_CTRL_LDO1_EN       BIT(1)
64
65 /* LDO_CTRL bitfields */
66 #define TPS65023_LDO_CTRL_LDOx_SHIFT(ldo_id)    ((ldo_id)*4)
67 #define TPS65023_LDO_CTRL_LDOx_MASK(ldo_id)     (0xF0 >> ((ldo_id)*4))
68
69 /* Number of step-down converters available */
70 #define TPS65023_NUM_DCDC               3
71 /* Number of LDO voltage regulators  available */
72 #define TPS65023_NUM_LDO                2
73 /* Number of total regulators available */
74 #define TPS65023_NUM_REGULATOR  (TPS65023_NUM_DCDC + TPS65023_NUM_LDO)
75
76 /* DCDCs */
77 #define TPS65023_DCDC_1                 0
78 #define TPS65023_DCDC_2                 1
79 #define TPS65023_DCDC_3                 2
80 /* LDOs */
81 #define TPS65023_LDO_1                  3
82 #define TPS65023_LDO_2                  4
83
84 #define TPS65023_MAX_REG_ID             TPS65023_LDO_2
85
86 /* Supported voltage values for regulators */
87 static const u16 VDCDC1_VSEL_table[] = {
88         800, 825, 850, 875,
89         900, 925, 950, 975,
90         1000, 1025, 1050, 1075,
91         1100, 1125, 1150, 1175,
92         1200, 1225, 1250, 1275,
93         1300, 1325, 1350, 1375,
94         1400, 1425, 1450, 1475,
95         1500, 1525, 1550, 1600,
96 };
97
98 static const u16 LDO1_VSEL_table[] = {
99         1000, 1100, 1300, 1800,
100         2200, 2600, 2800, 3150,
101 };
102
103 static const u16 LDO2_VSEL_table[] = {
104         1050, 1200, 1300, 1800,
105         2500, 2800, 3000, 3300,
106 };
107
108 static unsigned int num_voltages[] = {ARRAY_SIZE(VDCDC1_VSEL_table),
109                                 0, 0, ARRAY_SIZE(LDO1_VSEL_table),
110                                 ARRAY_SIZE(LDO2_VSEL_table)};
111
112 /* Regulator specific details */
113 struct tps_info {
114         const char *name;
115         unsigned min_uV;
116         unsigned max_uV;
117         bool fixed;
118         u8 table_len;
119         const u16 *table;
120 };
121
122 /* PMIC details */
123 struct tps_pmic {
124         struct regulator_desc desc[TPS65023_NUM_REGULATOR];
125         struct i2c_client *client;
126         struct regulator_dev *rdev[TPS65023_NUM_REGULATOR];
127         const struct tps_info *info[TPS65023_NUM_REGULATOR];
128         struct mutex io_lock;
129 };
130
131 static inline int tps_65023_read(struct tps_pmic *tps, u8 reg)
132 {
133         return i2c_smbus_read_byte_data(tps->client, reg);
134 }
135
136 static inline int tps_65023_write(struct tps_pmic *tps, u8 reg, u8 val)
137 {
138         return i2c_smbus_write_byte_data(tps->client, reg, val);
139 }
140
141 static int tps_65023_set_bits(struct tps_pmic *tps, u8 reg, u8 mask)
142 {
143         int err, data;
144
145         mutex_lock(&tps->io_lock);
146
147         data = tps_65023_read(tps, reg);
148         if (data < 0) {
149                 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
150                 err = data;
151                 goto out;
152         }
153
154         data |= mask;
155         err = tps_65023_write(tps, reg, data);
156         if (err)
157                 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
158
159 out:
160         mutex_unlock(&tps->io_lock);
161         return err;
162 }
163
164 static int tps_65023_clear_bits(struct tps_pmic *tps, u8 reg, u8 mask)
165 {
166         int err, data;
167
168         mutex_lock(&tps->io_lock);
169
170         data = tps_65023_read(tps, reg);
171         if (data < 0) {
172                 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
173                 err = data;
174                 goto out;
175         }
176
177         data &= ~mask;
178
179         err = tps_65023_write(tps, reg, data);
180         if (err)
181                 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
182
183 out:
184         mutex_unlock(&tps->io_lock);
185         return err;
186
187 }
188
189 static int tps_65023_reg_read(struct tps_pmic *tps, u8 reg)
190 {
191         int data;
192
193         mutex_lock(&tps->io_lock);
194
195         data = tps_65023_read(tps, reg);
196         if (data < 0)
197                 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
198
199         mutex_unlock(&tps->io_lock);
200         return data;
201 }
202
203 static int tps_65023_reg_write(struct tps_pmic *tps, u8 reg, u8 val)
204 {
205         int err;
206
207         mutex_lock(&tps->io_lock);
208
209         err = tps_65023_write(tps, reg, val);
210         if (err < 0)
211                 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
212
213         mutex_unlock(&tps->io_lock);
214         return err;
215 }
216
217 static int tps65023_dcdc_is_enabled(struct regulator_dev *dev)
218 {
219         struct tps_pmic *tps = rdev_get_drvdata(dev);
220         int data, dcdc = rdev_get_id(dev);
221         u8 shift;
222
223         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
224                 return -EINVAL;
225
226         shift = TPS65023_NUM_REGULATOR - dcdc;
227         data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
228
229         if (data < 0)
230                 return data;
231         else
232                 return (data & 1<<shift) ? 1 : 0;
233 }
234
235 static int tps65023_ldo_is_enabled(struct regulator_dev *dev)
236 {
237         struct tps_pmic *tps = rdev_get_drvdata(dev);
238         int data, ldo = rdev_get_id(dev);
239         u8 shift;
240
241         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
242                 return -EINVAL;
243
244         shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
245         data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
246
247         if (data < 0)
248                 return data;
249         else
250                 return (data & 1<<shift) ? 1 : 0;
251 }
252
253 static int tps65023_dcdc_enable(struct regulator_dev *dev)
254 {
255         struct tps_pmic *tps = rdev_get_drvdata(dev);
256         int dcdc = rdev_get_id(dev);
257         u8 shift;
258
259         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
260                 return -EINVAL;
261
262         shift = TPS65023_NUM_REGULATOR - dcdc;
263         return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
264 }
265
266 static int tps65023_dcdc_disable(struct regulator_dev *dev)
267 {
268         struct tps_pmic *tps = rdev_get_drvdata(dev);
269         int dcdc = rdev_get_id(dev);
270         u8 shift;
271
272         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
273                 return -EINVAL;
274
275         shift = TPS65023_NUM_REGULATOR - dcdc;
276         return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
277 }
278
279 static int tps65023_ldo_enable(struct regulator_dev *dev)
280 {
281         struct tps_pmic *tps = rdev_get_drvdata(dev);
282         int ldo = rdev_get_id(dev);
283         u8 shift;
284
285         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
286                 return -EINVAL;
287
288         shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
289         return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
290 }
291
292 static int tps65023_ldo_disable(struct regulator_dev *dev)
293 {
294         struct tps_pmic *tps = rdev_get_drvdata(dev);
295         int ldo = rdev_get_id(dev);
296         u8 shift;
297
298         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
299                 return -EINVAL;
300
301         shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
302         return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
303 }
304
305 static int tps65023_dcdc_get_voltage(struct regulator_dev *dev)
306 {
307         struct tps_pmic *tps = rdev_get_drvdata(dev);
308         int data, dcdc = rdev_get_id(dev);
309
310         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
311                 return -EINVAL;
312
313         if (dcdc == TPS65023_DCDC_1) {
314                 data = tps_65023_reg_read(tps, TPS65023_REG_DEF_CORE);
315                 if (data < 0)
316                         return data;
317                 data &= (tps->info[dcdc]->table_len - 1);
318                 return tps->info[dcdc]->table[data] * 1000;
319         } else
320                 return tps->info[dcdc]->min_uV;
321 }
322
323 static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
324                                      int min_uV, int max_uV,
325                                      unsigned *selector)
326 {
327         struct tps_pmic *tps = rdev_get_drvdata(dev);
328         int dcdc = rdev_get_id(dev);
329         int vsel;
330
331         if (dcdc != TPS65023_DCDC_1)
332                 return -EINVAL;
333
334         if (min_uV < tps->info[dcdc]->min_uV
335                         || min_uV > tps->info[dcdc]->max_uV)
336                 return -EINVAL;
337         if (max_uV < tps->info[dcdc]->min_uV
338                         || max_uV > tps->info[dcdc]->max_uV)
339                 return -EINVAL;
340
341         for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
342                 int mV = tps->info[dcdc]->table[vsel];
343                 int uV = mV * 1000;
344
345                 /* Break at the first in-range value */
346                 if (min_uV <= uV && uV <= max_uV)
347                         break;
348         }
349
350         *selector = vsel;
351
352         /* write to the register in case we found a match */
353         if (vsel == tps->info[dcdc]->table_len)
354                 return -EINVAL;
355         else
356                 return tps_65023_reg_write(tps, TPS65023_REG_DEF_CORE, vsel);
357 }
358
359 static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
360 {
361         struct tps_pmic *tps = rdev_get_drvdata(dev);
362         int data, ldo = rdev_get_id(dev);
363
364         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
365                 return -EINVAL;
366
367         data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
368         if (data < 0)
369                 return data;
370
371         data >>= (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1));
372         data &= (tps->info[ldo]->table_len - 1);
373         return tps->info[ldo]->table[data] * 1000;
374 }
375
376 static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
377                                     int min_uV, int max_uV, unsigned *selector)
378 {
379         struct tps_pmic *tps = rdev_get_drvdata(dev);
380         int data, vsel, ldo = rdev_get_id(dev);
381
382         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
383                 return -EINVAL;
384
385         if (min_uV < tps->info[ldo]->min_uV || min_uV > tps->info[ldo]->max_uV)
386                 return -EINVAL;
387         if (max_uV < tps->info[ldo]->min_uV || max_uV > tps->info[ldo]->max_uV)
388                 return -EINVAL;
389
390         for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
391                 int mV = tps->info[ldo]->table[vsel];
392                 int uV = mV * 1000;
393
394                 /* Break at the first in-range value */
395                 if (min_uV <= uV && uV <= max_uV)
396                         break;
397         }
398
399         if (vsel == tps->info[ldo]->table_len)
400                 return -EINVAL;
401
402         *selector = vsel;
403
404         data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
405         if (data < 0)
406                 return data;
407
408         data &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
409         data |= (vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
410         return tps_65023_reg_write(tps, TPS65023_REG_LDO_CTRL, data);
411 }
412
413 static int tps65023_dcdc_list_voltage(struct regulator_dev *dev,
414                                         unsigned selector)
415 {
416         struct tps_pmic *tps = rdev_get_drvdata(dev);
417         int dcdc = rdev_get_id(dev);
418
419         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
420                 return -EINVAL;
421
422         if (dcdc == TPS65023_DCDC_1) {
423                 if (selector >= tps->info[dcdc]->table_len)
424                         return -EINVAL;
425                 else
426                         return tps->info[dcdc]->table[selector] * 1000;
427         } else
428                 return tps->info[dcdc]->min_uV;
429 }
430
431 static int tps65023_ldo_list_voltage(struct regulator_dev *dev,
432                                         unsigned selector)
433 {
434         struct tps_pmic *tps = rdev_get_drvdata(dev);
435         int ldo = rdev_get_id(dev);
436
437         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
438                 return -EINVAL;
439
440         if (selector >= tps->info[ldo]->table_len)
441                 return -EINVAL;
442         else
443                 return tps->info[ldo]->table[selector] * 1000;
444 }
445
446 /* Operations permitted on VDCDCx */
447 static struct regulator_ops tps65023_dcdc_ops = {
448         .is_enabled = tps65023_dcdc_is_enabled,
449         .enable = tps65023_dcdc_enable,
450         .disable = tps65023_dcdc_disable,
451         .get_voltage = tps65023_dcdc_get_voltage,
452         .set_voltage = tps65023_dcdc_set_voltage,
453         .list_voltage = tps65023_dcdc_list_voltage,
454 };
455
456 /* Operations permitted on LDOx */
457 static struct regulator_ops tps65023_ldo_ops = {
458         .is_enabled = tps65023_ldo_is_enabled,
459         .enable = tps65023_ldo_enable,
460         .disable = tps65023_ldo_disable,
461         .get_voltage = tps65023_ldo_get_voltage,
462         .set_voltage = tps65023_ldo_set_voltage,
463         .list_voltage = tps65023_ldo_list_voltage,
464 };
465
466 static int __devinit tps_65023_probe(struct i2c_client *client,
467                                      const struct i2c_device_id *id)
468 {
469         static int desc_id;
470         const struct tps_info *info = (void *)id->driver_data;
471         struct regulator_init_data *init_data;
472         struct regulator_dev *rdev;
473         struct tps_pmic *tps;
474         int i;
475         int error;
476
477         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
478                 return -EIO;
479
480         /**
481          * init_data points to array of regulator_init structures
482          * coming from the board-evm file.
483          */
484         init_data = client->dev.platform_data;
485         if (!init_data)
486                 return -EIO;
487
488         tps = kzalloc(sizeof(*tps), GFP_KERNEL);
489         if (!tps)
490                 return -ENOMEM;
491
492         mutex_init(&tps->io_lock);
493
494         /* common for all regulators */
495         tps->client = client;
496
497         for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
498                 /* Store regulator specific information */
499                 tps->info[i] = info;
500
501                 tps->desc[i].name = info->name;
502                 tps->desc[i].id = desc_id++;
503                 tps->desc[i].n_voltages = num_voltages[i];
504                 tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
505                                         &tps65023_ldo_ops : &tps65023_dcdc_ops);
506                 tps->desc[i].type = REGULATOR_VOLTAGE;
507                 tps->desc[i].owner = THIS_MODULE;
508
509                 /* Register the regulators */
510                 rdev = regulator_register(&tps->desc[i], &client->dev,
511                                           init_data, tps);
512                 if (IS_ERR(rdev)) {
513                         dev_err(&client->dev, "failed to register %s\n",
514                                 id->name);
515                         error = PTR_ERR(rdev);
516                         goto fail;
517                 }
518
519                 /* Save regulator for cleanup */
520                 tps->rdev[i] = rdev;
521         }
522
523         i2c_set_clientdata(client, tps);
524
525         return 0;
526
527  fail:
528         while (--i >= 0)
529                 regulator_unregister(tps->rdev[i]);
530
531         kfree(tps);
532         return error;
533 }
534
535 /**
536  * tps_65023_remove - TPS65023 driver i2c remove handler
537  * @client: i2c driver client device structure
538  *
539  * Unregister TPS driver as an i2c client device driver
540  */
541 static int __devexit tps_65023_remove(struct i2c_client *client)
542 {
543         struct tps_pmic *tps = i2c_get_clientdata(client);
544         int i;
545
546         for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
547                 regulator_unregister(tps->rdev[i]);
548
549         kfree(tps);
550
551         return 0;
552 }
553
554 static const struct tps_info tps65023_regs[] = {
555         {
556                 .name = "VDCDC1",
557                 .min_uV =  800000,
558                 .max_uV = 1600000,
559                 .table_len = ARRAY_SIZE(VDCDC1_VSEL_table),
560                 .table = VDCDC1_VSEL_table,
561         },
562         {
563                 .name = "VDCDC2",
564                 .min_uV =  3300000,
565                 .max_uV = 3300000,
566                 .fixed = 1,
567         },
568         {
569                 .name = "VDCDC3",
570                 .min_uV =  1800000,
571                 .max_uV = 1800000,
572                 .fixed = 1,
573         },
574         {
575                 .name = "LDO1",
576                 .min_uV = 1000000,
577                 .max_uV = 3150000,
578                 .table_len = ARRAY_SIZE(LDO1_VSEL_table),
579                 .table = LDO1_VSEL_table,
580         },
581         {
582                 .name = "LDO2",
583                 .min_uV = 1050000,
584                 .max_uV = 3300000,
585                 .table_len = ARRAY_SIZE(LDO2_VSEL_table),
586                 .table = LDO2_VSEL_table,
587         },
588 };
589
590 static const struct i2c_device_id tps_65023_id[] = {
591         {.name = "tps65023",
592         .driver_data = (unsigned long) tps65023_regs,},
593         {.name = "tps65021",
594         .driver_data = (unsigned long) tps65023_regs,},
595         { },
596 };
597
598 MODULE_DEVICE_TABLE(i2c, tps_65023_id);
599
600 static struct i2c_driver tps_65023_i2c_driver = {
601         .driver = {
602                 .name = "tps65023",
603                 .owner = THIS_MODULE,
604         },
605         .probe = tps_65023_probe,
606         .remove = __devexit_p(tps_65023_remove),
607         .id_table = tps_65023_id,
608 };
609
610 /**
611  * tps_65023_init
612  *
613  * Module init function
614  */
615 static int __init tps_65023_init(void)
616 {
617         return i2c_add_driver(&tps_65023_i2c_driver);
618 }
619 subsys_initcall(tps_65023_init);
620
621 /**
622  * tps_65023_cleanup
623  *
624  * Module exit function
625  */
626 static void __exit tps_65023_cleanup(void)
627 {
628         i2c_del_driver(&tps_65023_i2c_driver);
629 }
630 module_exit(tps_65023_cleanup);
631
632 MODULE_AUTHOR("Texas Instruments");
633 MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
634 MODULE_LICENSE("GPL v2");