regulator: tps80031: adjust tolerance if req minuV > dev minuV
[linux-2.6.git] / drivers / regulator / tps6507x-regulator.c
1 /*
2  * tps6507x-regulator.c
3  *
4  * Regulator driver for TPS65073 PMIC
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/regulator/tps6507x.h>
26 #include <linux/delay.h>
27 #include <linux/slab.h>
28 #include <linux/mfd/tps6507x.h>
29
30 /* DCDC's */
31 #define TPS6507X_DCDC_1                         0
32 #define TPS6507X_DCDC_2                         1
33 #define TPS6507X_DCDC_3                         2
34 /* LDOs */
35 #define TPS6507X_LDO_1                          3
36 #define TPS6507X_LDO_2                          4
37
38 #define TPS6507X_MAX_REG_ID                     TPS6507X_LDO_2
39
40 /* Number of step-down converters available */
41 #define TPS6507X_NUM_DCDC                       3
42 /* Number of LDO voltage regulators  available */
43 #define TPS6507X_NUM_LDO                        2
44 /* Number of total regulators available */
45 #define TPS6507X_NUM_REGULATOR          (TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)
46
47 /* Supported voltage values for regulators (in milliVolts) */
48 static const u16 VDCDCx_VSEL_table[] = {
49         725, 750, 775, 800,
50         825, 850, 875, 900,
51         925, 950, 975, 1000,
52         1025, 1050, 1075, 1100,
53         1125, 1150, 1175, 1200,
54         1225, 1250, 1275, 1300,
55         1325, 1350, 1375, 1400,
56         1425, 1450, 1475, 1500,
57         1550, 1600, 1650, 1700,
58         1750, 1800, 1850, 1900,
59         1950, 2000, 2050, 2100,
60         2150, 2200, 2250, 2300,
61         2350, 2400, 2450, 2500,
62         2550, 2600, 2650, 2700,
63         2750, 2800, 2850, 2900,
64         3000, 3100, 3200, 3300,
65 };
66
67 static const u16 LDO1_VSEL_table[] = {
68         1000, 1100, 1200, 1250,
69         1300, 1350, 1400, 1500,
70         1600, 1800, 2500, 2750,
71         2800, 3000, 3100, 3300,
72 };
73
74 static const u16 LDO2_VSEL_table[] = {
75         725, 750, 775, 800,
76         825, 850, 875, 900,
77         925, 950, 975, 1000,
78         1025, 1050, 1075, 1100,
79         1125, 1150, 1175, 1200,
80         1225, 1250, 1275, 1300,
81         1325, 1350, 1375, 1400,
82         1425, 1450, 1475, 1500,
83         1550, 1600, 1650, 1700,
84         1750, 1800, 1850, 1900,
85         1950, 2000, 2050, 2100,
86         2150, 2200, 2250, 2300,
87         2350, 2400, 2450, 2500,
88         2550, 2600, 2650, 2700,
89         2750, 2800, 2850, 2900,
90         3000, 3100, 3200, 3300,
91 };
92
93 struct tps_info {
94         const char *name;
95         unsigned min_uV;
96         unsigned max_uV;
97         u8 table_len;
98         const u16 *table;
99
100         /* Does DCDC high or the low register defines output voltage? */
101         bool defdcdc_default;
102 };
103
104 static struct tps_info tps6507x_pmic_regs[] = {
105         {
106                 .name = "VDCDC1",
107                 .min_uV = 725000,
108                 .max_uV = 3300000,
109                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
110                 .table = VDCDCx_VSEL_table,
111         },
112         {
113                 .name = "VDCDC2",
114                 .min_uV = 725000,
115                 .max_uV = 3300000,
116                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
117                 .table = VDCDCx_VSEL_table,
118         },
119         {
120                 .name = "VDCDC3",
121                 .min_uV = 725000,
122                 .max_uV = 3300000,
123                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
124                 .table = VDCDCx_VSEL_table,
125         },
126         {
127                 .name = "LDO1",
128                 .min_uV = 1000000,
129                 .max_uV = 3300000,
130                 .table_len = ARRAY_SIZE(LDO1_VSEL_table),
131                 .table = LDO1_VSEL_table,
132         },
133         {
134                 .name = "LDO2",
135                 .min_uV = 725000,
136                 .max_uV = 3300000,
137                 .table_len = ARRAY_SIZE(LDO2_VSEL_table),
138                 .table = LDO2_VSEL_table,
139         },
140 };
141
142 struct tps6507x_pmic {
143         struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
144         struct tps6507x_dev *mfd;
145         struct regulator_dev *rdev[TPS6507X_NUM_REGULATOR];
146         struct tps_info *info[TPS6507X_NUM_REGULATOR];
147         struct mutex io_lock;
148 };
149 static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
150 {
151         u8 val;
152         int err;
153
154         err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
155
156         if (err)
157                 return err;
158
159         return val;
160 }
161
162 static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
163 {
164         return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
165 }
166
167 static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
168 {
169         int err, data;
170
171         mutex_lock(&tps->io_lock);
172
173         data = tps6507x_pmic_read(tps, reg);
174         if (data < 0) {
175                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
176                 err = data;
177                 goto out;
178         }
179
180         data |= mask;
181         err = tps6507x_pmic_write(tps, reg, data);
182         if (err)
183                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
184
185 out:
186         mutex_unlock(&tps->io_lock);
187         return err;
188 }
189
190 static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
191 {
192         int err, data;
193
194         mutex_lock(&tps->io_lock);
195
196         data = tps6507x_pmic_read(tps, reg);
197         if (data < 0) {
198                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
199                 err = data;
200                 goto out;
201         }
202
203         data &= ~mask;
204         err = tps6507x_pmic_write(tps, reg, data);
205         if (err)
206                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
207
208 out:
209         mutex_unlock(&tps->io_lock);
210         return err;
211 }
212
213 static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
214 {
215         int data;
216
217         mutex_lock(&tps->io_lock);
218
219         data = tps6507x_pmic_read(tps, reg);
220         if (data < 0)
221                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
222
223         mutex_unlock(&tps->io_lock);
224         return data;
225 }
226
227 static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
228 {
229         int err;
230
231         mutex_lock(&tps->io_lock);
232
233         err = tps6507x_pmic_write(tps, reg, val);
234         if (err < 0)
235                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
236
237         mutex_unlock(&tps->io_lock);
238         return err;
239 }
240
241 static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
242 {
243         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
244         int data, rid = rdev_get_id(dev);
245         u8 shift;
246
247         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
248                 return -EINVAL;
249
250         shift = TPS6507X_MAX_REG_ID - rid;
251         data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
252
253         if (data < 0)
254                 return data;
255         else
256                 return (data & 1<<shift) ? 1 : 0;
257 }
258
259 static int tps6507x_pmic_enable(struct regulator_dev *dev)
260 {
261         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
262         int rid = rdev_get_id(dev);
263         u8 shift;
264
265         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
266                 return -EINVAL;
267
268         shift = TPS6507X_MAX_REG_ID - rid;
269         return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
270 }
271
272 static int tps6507x_pmic_disable(struct regulator_dev *dev)
273 {
274         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
275         int rid = rdev_get_id(dev);
276         u8 shift;
277
278         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
279                 return -EINVAL;
280
281         shift = TPS6507X_MAX_REG_ID - rid;
282         return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
283                                         1 << shift);
284 }
285
286 static int tps6507x_pmic_get_voltage(struct regulator_dev *dev)
287 {
288         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
289         int data, rid = rdev_get_id(dev);
290         u8 reg, mask;
291
292         switch (rid) {
293         case TPS6507X_DCDC_1:
294                 reg = TPS6507X_REG_DEFDCDC1;
295                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
296                 break;
297         case TPS6507X_DCDC_2:
298                 if (tps->info[rid]->defdcdc_default)
299                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
300                 else
301                         reg = TPS6507X_REG_DEFDCDC2_LOW;
302                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
303                 break;
304         case TPS6507X_DCDC_3:
305                 if (tps->info[rid]->defdcdc_default)
306                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
307                 else
308                         reg = TPS6507X_REG_DEFDCDC3_LOW;
309                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
310                 break;
311         case TPS6507X_LDO_1:
312                 reg = TPS6507X_REG_LDO_CTRL1;
313                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
314                 break;
315         case TPS6507X_LDO_2:
316                 reg = TPS6507X_REG_DEFLDO2;
317                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
318                 break;
319         default:
320                 return -EINVAL;
321         }
322
323         data = tps6507x_pmic_reg_read(tps, reg);
324         if (data < 0)
325                 return data;
326
327         data &= mask;
328         return tps->info[rid]->table[data] * 1000;
329 }
330
331 static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
332                                           unsigned selector)
333 {
334         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
335         int data, rid = rdev_get_id(dev);
336         u8 reg, mask;
337
338         switch (rid) {
339         case TPS6507X_DCDC_1:
340                 reg = TPS6507X_REG_DEFDCDC1;
341                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
342                 break;
343         case TPS6507X_DCDC_2:
344                 if (tps->info[rid]->defdcdc_default)
345                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
346                 else
347                         reg = TPS6507X_REG_DEFDCDC2_LOW;
348                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
349                 break;
350         case TPS6507X_DCDC_3:
351                 if (tps->info[rid]->defdcdc_default)
352                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
353                 else
354                         reg = TPS6507X_REG_DEFDCDC3_LOW;
355                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
356                 break;
357         case TPS6507X_LDO_1:
358                 reg = TPS6507X_REG_LDO_CTRL1;
359                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
360                 break;
361         case TPS6507X_LDO_2:
362                 reg = TPS6507X_REG_DEFLDO2;
363                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
364                 break;
365         default:
366                 return -EINVAL;
367         }
368
369         data = tps6507x_pmic_reg_read(tps, reg);
370         if (data < 0)
371                 return data;
372
373         data &= ~mask;
374         data |= selector;
375
376         return tps6507x_pmic_reg_write(tps, reg, data);
377 }
378
379 static int tps6507x_pmic_list_voltage(struct regulator_dev *dev,
380                                         unsigned selector)
381 {
382         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
383         int rid = rdev_get_id(dev);
384
385         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
386                 return -EINVAL;
387
388         if (selector >= tps->info[rid]->table_len)
389                 return -EINVAL;
390         else
391                 return tps->info[rid]->table[selector] * 1000;
392 }
393
394 static struct regulator_ops tps6507x_pmic_ops = {
395         .is_enabled = tps6507x_pmic_is_enabled,
396         .enable = tps6507x_pmic_enable,
397         .disable = tps6507x_pmic_disable,
398         .get_voltage = tps6507x_pmic_get_voltage,
399         .set_voltage_sel = tps6507x_pmic_set_voltage_sel,
400         .list_voltage = tps6507x_pmic_list_voltage,
401 };
402
403 static __devinit int tps6507x_pmic_probe(struct platform_device *pdev)
404 {
405         struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
406         struct tps_info *info = &tps6507x_pmic_regs[0];
407         struct regulator_init_data *init_data;
408         struct regulator_dev *rdev;
409         struct tps6507x_pmic *tps;
410         struct tps6507x_board *tps_board;
411         int i;
412         int error;
413
414         /**
415          * tps_board points to pmic related constants
416          * coming from the board-evm file.
417          */
418
419         tps_board = dev_get_platdata(tps6507x_dev->dev);
420         if (!tps_board)
421                 return -EINVAL;
422
423         /**
424          * init_data points to array of regulator_init structures
425          * coming from the board-evm file.
426          */
427         init_data = tps_board->tps6507x_pmic_init_data;
428         if (!init_data)
429                 return -EINVAL;
430
431         tps = kzalloc(sizeof(*tps), GFP_KERNEL);
432         if (!tps)
433                 return -ENOMEM;
434
435         mutex_init(&tps->io_lock);
436
437         /* common for all regulators */
438         tps->mfd = tps6507x_dev;
439
440         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
441                 /* Register the regulators */
442                 tps->info[i] = info;
443                 if (init_data->driver_data) {
444                         struct tps6507x_reg_platform_data *data =
445                                                         init_data->driver_data;
446                         tps->info[i]->defdcdc_default = data->defdcdc_default;
447                 }
448
449                 tps->desc[i].name = info->name;
450                 tps->desc[i].id = i;
451                 tps->desc[i].n_voltages = info->table_len;
452                 tps->desc[i].ops = &tps6507x_pmic_ops;
453                 tps->desc[i].type = REGULATOR_VOLTAGE;
454                 tps->desc[i].owner = THIS_MODULE;
455
456                 rdev = regulator_register(&tps->desc[i],
457                                         tps6507x_dev->dev, init_data, tps, NULL);
458                 if (IS_ERR(rdev)) {
459                         dev_err(tps6507x_dev->dev,
460                                 "failed to register %s regulator\n",
461                                 pdev->name);
462                         error = PTR_ERR(rdev);
463                         goto fail;
464                 }
465
466                 /* Save regulator for cleanup */
467                 tps->rdev[i] = rdev;
468         }
469
470         tps6507x_dev->pmic = tps;
471         platform_set_drvdata(pdev, tps6507x_dev);
472
473         return 0;
474
475 fail:
476         while (--i >= 0)
477                 regulator_unregister(tps->rdev[i]);
478
479         kfree(tps);
480         return error;
481 }
482
483 static int __devexit tps6507x_pmic_remove(struct platform_device *pdev)
484 {
485         struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
486         struct tps6507x_pmic *tps = tps6507x_dev->pmic;
487         int i;
488
489         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++)
490                 regulator_unregister(tps->rdev[i]);
491
492         kfree(tps);
493
494         return 0;
495 }
496
497 static struct platform_driver tps6507x_pmic_driver = {
498         .driver = {
499                 .name = "tps6507x-pmic",
500                 .owner = THIS_MODULE,
501         },
502         .probe = tps6507x_pmic_probe,
503         .remove = __devexit_p(tps6507x_pmic_remove),
504 };
505
506 static int __init tps6507x_pmic_init(void)
507 {
508         return platform_driver_register(&tps6507x_pmic_driver);
509 }
510 subsys_initcall(tps6507x_pmic_init);
511
512 static void __exit tps6507x_pmic_cleanup(void)
513 {
514         platform_driver_unregister(&tps6507x_pmic_driver);
515 }
516 module_exit(tps6507x_pmic_cleanup);
517
518 MODULE_AUTHOR("Texas Instruments");
519 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
520 MODULE_LICENSE("GPL v2");
521 MODULE_ALIAS("platform:tps6507x-pmic");