regulator: twl: add clk32kg to twl-regulator
[linux-3.10.git] / drivers / regulator / twl-regulator.c
1 /*
2  * twl-regulator.c -- support regulators in twl4030/twl6030 family chips
3  *
4  * Copyright (C) 2008 David Brownell
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/err.h>
15 #include <linux/delay.h>
16 #include <linux/platform_device.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/regulator/machine.h>
19 #include <linux/i2c/twl.h>
20
21
22 /*
23  * The TWL4030/TW5030/TPS659x0/TWL6030 family chips include power management, a
24  * USB OTG transceiver, an RTC, ADC, PWM, and lots more.  Some versions
25  * include an audio codec, battery charger, and more voltage regulators.
26  * These chips are often used in OMAP-based systems.
27  *
28  * This driver implements software-based resource control for various
29  * voltage regulators.  This is usually augmented with state machine
30  * based control.
31  */
32
33 struct twlreg_info {
34         /* start of regulator's PM_RECEIVER control register bank */
35         u8                      base;
36
37         /* twl resource ID, for resource control state machine */
38         u8                      id;
39
40         /* voltage in mV = table[VSEL]; table_len must be a power-of-two */
41         u8                      table_len;
42         const u16               *table;
43
44         /* regulator specific turn-on delay */
45         u16                     delay;
46
47         /* State REMAP default configuration */
48         u8                      remap;
49
50         /* chip constraints on regulator behavior */
51         u16                     min_mV;
52         u16                     max_mV;
53
54         /* used by regulator core */
55         struct regulator_desc   desc;
56 };
57
58
59 /* LDO control registers ... offset is from the base of its register bank.
60  * The first three registers of all power resource banks help hardware to
61  * manage the various resource groups.
62  */
63 /* Common offset in TWL4030/6030 */
64 #define VREG_GRP                0
65 /* TWL4030 register offsets */
66 #define VREG_TYPE               1
67 #define VREG_REMAP              2
68 #define VREG_DEDICATED          3       /* LDO control */
69 /* TWL6030 register offsets */
70 #define VREG_TRANS              1
71 #define VREG_STATE              2
72 #define VREG_VOLTAGE            3
73 /* TWL6030 Misc register offsets */
74 #define VREG_BC_ALL             1
75 #define VREG_BC_REF             2
76 #define VREG_BC_PROC            3
77 #define VREG_BC_CLK_RST         4
78
79 static inline int
80 twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
81 {
82         u8 value;
83         int status;
84
85         status = twl_i2c_read_u8(slave_subgp,
86                         &value, info->base + offset);
87         return (status < 0) ? status : value;
88 }
89
90 static inline int
91 twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
92                                                  u8 value)
93 {
94         return twl_i2c_write_u8(slave_subgp,
95                         value, info->base + offset);
96 }
97
98 /*----------------------------------------------------------------------*/
99
100 /* generic power resource operations, which work on all regulators */
101
102 static int twlreg_grp(struct regulator_dev *rdev)
103 {
104         return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
105                                                                  VREG_GRP);
106 }
107
108 /*
109  * Enable/disable regulators by joining/leaving the P1 (processor) group.
110  * We assume nobody else is updating the DEV_GRP registers.
111  */
112 /* definition for 4030 family */
113 #define P3_GRP_4030     BIT(7)          /* "peripherals" */
114 #define P2_GRP_4030     BIT(6)          /* secondary processor, modem, etc */
115 #define P1_GRP_4030     BIT(5)          /* CPU/Linux */
116 /* definition for 6030 family */
117 #define P3_GRP_6030     BIT(2)          /* secondary processor, modem, etc */
118 #define P2_GRP_6030     BIT(1)          /* "peripherals" */
119 #define P1_GRP_6030     BIT(0)          /* CPU/Linux */
120
121 static int twlreg_is_enabled(struct regulator_dev *rdev)
122 {
123         int     state = twlreg_grp(rdev);
124
125         if (state < 0)
126                 return state;
127
128         if (twl_class_is_4030())
129                 state &= P1_GRP_4030;
130         else
131                 state &= P1_GRP_6030;
132         return state;
133 }
134
135 static int twlreg_enable(struct regulator_dev *rdev)
136 {
137         struct twlreg_info      *info = rdev_get_drvdata(rdev);
138         int                     grp;
139         int                     ret;
140
141         grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
142         if (grp < 0)
143                 return grp;
144
145         if (twl_class_is_4030())
146                 grp |= P1_GRP_4030;
147         else
148                 grp |= P1_GRP_6030;
149
150         ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
151
152         udelay(info->delay);
153
154         return ret;
155 }
156
157 static int twlreg_disable(struct regulator_dev *rdev)
158 {
159         struct twlreg_info      *info = rdev_get_drvdata(rdev);
160         int                     grp;
161
162         grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
163         if (grp < 0)
164                 return grp;
165
166         if (twl_class_is_4030())
167                 grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
168         else
169                 grp &= ~(P1_GRP_6030 | P2_GRP_6030 | P3_GRP_6030);
170
171         return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
172 }
173
174 static int twlreg_get_status(struct regulator_dev *rdev)
175 {
176         int     state = twlreg_grp(rdev);
177
178         if (twl_class_is_6030())
179                 return 0; /* FIXME return for 6030 regulator */
180
181         if (state < 0)
182                 return state;
183         state &= 0x0f;
184
185         /* assume state != WARM_RESET; we'd not be running...  */
186         if (!state)
187                 return REGULATOR_STATUS_OFF;
188         return (state & BIT(3))
189                 ? REGULATOR_STATUS_NORMAL
190                 : REGULATOR_STATUS_STANDBY;
191 }
192
193 static int twlreg_set_mode(struct regulator_dev *rdev, unsigned mode)
194 {
195         struct twlreg_info      *info = rdev_get_drvdata(rdev);
196         unsigned                message;
197         int                     status;
198
199         if (twl_class_is_6030())
200                 return 0; /* FIXME return for 6030 regulator */
201
202         /* We can only set the mode through state machine commands... */
203         switch (mode) {
204         case REGULATOR_MODE_NORMAL:
205                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
206                 break;
207         case REGULATOR_MODE_STANDBY:
208                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
209                 break;
210         default:
211                 return -EINVAL;
212         }
213
214         /* Ensure the resource is associated with some group */
215         status = twlreg_grp(rdev);
216         if (status < 0)
217                 return status;
218         if (!(status & (P3_GRP_4030 | P2_GRP_4030 | P1_GRP_4030)))
219                 return -EACCES;
220
221         status = twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
222                         message >> 8, TWL4030_PM_MASTER_PB_WORD_MSB);
223         if (status < 0)
224                 return status;
225
226         return twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
227                         message & 0xff, TWL4030_PM_MASTER_PB_WORD_LSB);
228 }
229
230 /*----------------------------------------------------------------------*/
231
232 /*
233  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
234  * select field in its control register.   We use tables indexed by VSEL
235  * to record voltages in milliVolts.  (Accuracy is about three percent.)
236  *
237  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
238  * currently handled by listing two slightly different VAUX2 regulators,
239  * only one of which will be configured.
240  *
241  * VSEL values documented as "TI cannot support these values" are flagged
242  * in these tables as UNSUP() values; we normally won't assign them.
243  *
244  * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
245  * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
246  */
247 #ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED
248 #define UNSUP_MASK      0x0000
249 #else
250 #define UNSUP_MASK      0x8000
251 #endif
252
253 #define UNSUP(x)        (UNSUP_MASK | (x))
254 #define IS_UNSUP(x)     (UNSUP_MASK & (x))
255 #define LDO_MV(x)       (~UNSUP_MASK & (x))
256
257
258 static const u16 VAUX1_VSEL_table[] = {
259         UNSUP(1500), UNSUP(1800), 2500, 2800,
260         3000, 3000, 3000, 3000,
261 };
262 static const u16 VAUX2_4030_VSEL_table[] = {
263         UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
264         1500, 1800, UNSUP(1850), 2500,
265         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
266         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
267 };
268 static const u16 VAUX2_VSEL_table[] = {
269         1700, 1700, 1900, 1300,
270         1500, 1800, 2000, 2500,
271         2100, 2800, 2200, 2300,
272         2400, 2400, 2400, 2400,
273 };
274 static const u16 VAUX3_VSEL_table[] = {
275         1500, 1800, 2500, 2800,
276         3000, 3000, 3000, 3000,
277 };
278 static const u16 VAUX4_VSEL_table[] = {
279         700, 1000, 1200, UNSUP(1300),
280         1500, 1800, UNSUP(1850), 2500,
281         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
282         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
283 };
284 static const u16 VMMC1_VSEL_table[] = {
285         1850, 2850, 3000, 3150,
286 };
287 static const u16 VMMC2_VSEL_table[] = {
288         UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
289         UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
290         2600, 2800, 2850, 3000,
291         3150, 3150, 3150, 3150,
292 };
293 static const u16 VPLL1_VSEL_table[] = {
294         1000, 1200, 1300, 1800,
295         UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
296 };
297 static const u16 VPLL2_VSEL_table[] = {
298         700, 1000, 1200, 1300,
299         UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
300         UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
301         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
302 };
303 static const u16 VSIM_VSEL_table[] = {
304         UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
305         2800, 3000, 3000, 3000,
306 };
307 static const u16 VDAC_VSEL_table[] = {
308         1200, 1300, 1800, 1800,
309 };
310 static const u16 VDD1_VSEL_table[] = {
311         800, 1450,
312 };
313 static const u16 VDD2_VSEL_table[] = {
314         800, 1450, 1500,
315 };
316 static const u16 VIO_VSEL_table[] = {
317         1800, 1850,
318 };
319 static const u16 VINTANA2_VSEL_table[] = {
320         2500, 2750,
321 };
322
323 static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
324 {
325         struct twlreg_info      *info = rdev_get_drvdata(rdev);
326         int                     mV = info->table[index];
327
328         return IS_UNSUP(mV) ? 0 : (LDO_MV(mV) * 1000);
329 }
330
331 static int
332 twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
333                        unsigned *selector)
334 {
335         struct twlreg_info      *info = rdev_get_drvdata(rdev);
336         int                     vsel;
337
338         for (vsel = 0; vsel < info->table_len; vsel++) {
339                 int mV = info->table[vsel];
340                 int uV;
341
342                 if (IS_UNSUP(mV))
343                         continue;
344                 uV = LDO_MV(mV) * 1000;
345
346                 /* REVISIT for VAUX2, first match may not be best/lowest */
347
348                 /* use the first in-range value */
349                 if (min_uV <= uV && uV <= max_uV) {
350                         *selector = vsel;
351                         return twlreg_write(info, TWL_MODULE_PM_RECEIVER,
352                                                         VREG_VOLTAGE, vsel);
353                 }
354         }
355
356         return -EDOM;
357 }
358
359 static int twl4030ldo_get_voltage(struct regulator_dev *rdev)
360 {
361         struct twlreg_info      *info = rdev_get_drvdata(rdev);
362         int             vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
363                                                                 VREG_VOLTAGE);
364
365         if (vsel < 0)
366                 return vsel;
367
368         vsel &= info->table_len - 1;
369         return LDO_MV(info->table[vsel]) * 1000;
370 }
371
372 static struct regulator_ops twl4030ldo_ops = {
373         .list_voltage   = twl4030ldo_list_voltage,
374
375         .set_voltage    = twl4030ldo_set_voltage,
376         .get_voltage    = twl4030ldo_get_voltage,
377
378         .enable         = twlreg_enable,
379         .disable        = twlreg_disable,
380         .is_enabled     = twlreg_is_enabled,
381
382         .set_mode       = twlreg_set_mode,
383
384         .get_status     = twlreg_get_status,
385 };
386
387 static int twl6030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
388 {
389         struct twlreg_info      *info = rdev_get_drvdata(rdev);
390
391         return ((info->min_mV + (index * 100)) * 1000);
392 }
393
394 static int
395 twl6030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
396                        unsigned *selector)
397 {
398         struct twlreg_info      *info = rdev_get_drvdata(rdev);
399         int                     vsel;
400
401         if ((min_uV/1000 < info->min_mV) || (max_uV/1000 > info->max_mV))
402                 return -EDOM;
403
404         /*
405          * Use the below formula to calculate vsel
406          * mV = 1000mv + 100mv * (vsel - 1)
407          */
408         vsel = (min_uV/1000 - 1000)/100 + 1;
409         *selector = vsel;
410         return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE, vsel);
411
412 }
413
414 static int twl6030ldo_get_voltage(struct regulator_dev *rdev)
415 {
416         struct twlreg_info      *info = rdev_get_drvdata(rdev);
417         int             vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
418                                                                 VREG_VOLTAGE);
419
420         if (vsel < 0)
421                 return vsel;
422
423         /*
424          * Use the below formula to calculate vsel
425          * mV = 1000mv + 100mv * (vsel - 1)
426          */
427         return (1000 + (100 * (vsel - 1))) * 1000;
428 }
429
430 static struct regulator_ops twl6030ldo_ops = {
431         .list_voltage   = twl6030ldo_list_voltage,
432
433         .set_voltage    = twl6030ldo_set_voltage,
434         .get_voltage    = twl6030ldo_get_voltage,
435
436         .enable         = twlreg_enable,
437         .disable        = twlreg_disable,
438         .is_enabled     = twlreg_is_enabled,
439
440         .set_mode       = twlreg_set_mode,
441
442         .get_status     = twlreg_get_status,
443 };
444
445 /*----------------------------------------------------------------------*/
446
447 /*
448  * Fixed voltage LDOs don't have a VSEL field to update.
449  */
450 static int twlfixed_list_voltage(struct regulator_dev *rdev, unsigned index)
451 {
452         struct twlreg_info      *info = rdev_get_drvdata(rdev);
453
454         return info->min_mV * 1000;
455 }
456
457 static int twlfixed_get_voltage(struct regulator_dev *rdev)
458 {
459         struct twlreg_info      *info = rdev_get_drvdata(rdev);
460
461         return info->min_mV * 1000;
462 }
463
464 static struct regulator_ops twlfixed_ops = {
465         .list_voltage   = twlfixed_list_voltage,
466
467         .get_voltage    = twlfixed_get_voltage,
468
469         .enable         = twlreg_enable,
470         .disable        = twlreg_disable,
471         .is_enabled     = twlreg_is_enabled,
472
473         .set_mode       = twlreg_set_mode,
474
475         .get_status     = twlreg_get_status,
476 };
477
478 static struct regulator_ops twl6030_fixed_resource = {
479         .enable         = twlreg_enable,
480         .disable        = twlreg_disable,
481         .is_enabled     = twlreg_is_enabled,
482         .get_status     = twlreg_get_status,
483 };
484
485 /*----------------------------------------------------------------------*/
486
487 #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
488                         remap_conf) \
489                 TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
490                         remap_conf, TWL4030)
491 #define TWL6030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
492                         remap_conf) \
493                 TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
494                         remap_conf, TWL6030)
495
496 #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) { \
497         .base = offset, \
498         .id = num, \
499         .table_len = ARRAY_SIZE(label##_VSEL_table), \
500         .table = label##_VSEL_table, \
501         .delay = turnon_delay, \
502         .remap = remap_conf, \
503         .desc = { \
504                 .name = #label, \
505                 .id = TWL4030_REG_##label, \
506                 .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
507                 .ops = &twl4030ldo_ops, \
508                 .type = REGULATOR_VOLTAGE, \
509                 .owner = THIS_MODULE, \
510                 }, \
511         }
512
513 #define TWL6030_ADJUSTABLE_LDO(label, offset, min_mVolts, max_mVolts, num, \
514                 remap_conf) { \
515         .base = offset, \
516         .id = num, \
517         .min_mV = min_mVolts, \
518         .max_mV = max_mVolts, \
519         .remap = remap_conf, \
520         .desc = { \
521                 .name = #label, \
522                 .id = TWL6030_REG_##label, \
523                 .n_voltages = (max_mVolts - min_mVolts)/100, \
524                 .ops = &twl6030ldo_ops, \
525                 .type = REGULATOR_VOLTAGE, \
526                 .owner = THIS_MODULE, \
527                 }, \
528         }
529
530
531 #define TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, remap_conf, \
532                 family) { \
533         .base = offset, \
534         .id = num, \
535         .min_mV = mVolts, \
536         .delay = turnon_delay, \
537         .remap = remap_conf, \
538         .desc = { \
539                 .name = #label, \
540                 .id = family##_REG_##label, \
541                 .n_voltages = 1, \
542                 .ops = &twlfixed_ops, \
543                 .type = REGULATOR_VOLTAGE, \
544                 .owner = THIS_MODULE, \
545                 }, \
546         }
547
548 #define TWL6030_FIXED_RESOURCE(label, offset, num, turnon_delay, remap_conf) { \
549         .base = offset, \
550         .id = num, \
551         .delay = turnon_delay, \
552         .remap = remap_conf, \
553         .desc = { \
554                 .name = #label, \
555                 .id = TWL6030_REG_##label, \
556                 .ops = &twl6030_fixed_resource, \
557                 .type = REGULATOR_VOLTAGE, \
558                 .owner = THIS_MODULE, \
559                 }, \
560         }
561
562 /*
563  * We list regulators here if systems need some level of
564  * software control over them after boot.
565  */
566 static struct twlreg_info twl_regs[] = {
567         TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08),
568         TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08),
569         TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08),
570         TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08),
571         TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08),
572         TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08),
573         TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08),
574         TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00),
575         TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08),
576         TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00),
577         TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08),
578         TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08),
579         TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08),
580         TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08),
581         TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08),
582         TWL4030_ADJUSTABLE_LDO(VDD1, 0x55, 15, 1000, 0x08),
583         TWL4030_ADJUSTABLE_LDO(VDD2, 0x63, 16, 1000, 0x08),
584         TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08),
585         TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08),
586         TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08),
587         /* VUSBCP is managed *only* by the USB subchip */
588
589         /* 6030 REG with base as PMC Slave Misc : 0x0030 */
590         /* Turnon-delay and remap configuration values for 6030 are not
591            verified since the specification is not public */
592         TWL6030_ADJUSTABLE_LDO(VAUX1_6030, 0x54, 1000, 3300, 1, 0x21),
593         TWL6030_ADJUSTABLE_LDO(VAUX2_6030, 0x58, 1000, 3300, 2, 0x21),
594         TWL6030_ADJUSTABLE_LDO(VAUX3_6030, 0x5c, 1000, 3300, 3, 0x21),
595         TWL6030_ADJUSTABLE_LDO(VMMC, 0x68, 1000, 3300, 4, 0x21),
596         TWL6030_ADJUSTABLE_LDO(VPP, 0x6c, 1000, 3300, 5, 0x21),
597         TWL6030_ADJUSTABLE_LDO(VUSIM, 0x74, 1000, 3300, 7, 0x21),
598         TWL6030_FIXED_LDO(VANA, 0x50, 2100, 15, 0, 0x21),
599         TWL6030_FIXED_LDO(VCXIO, 0x60, 1800, 16, 0, 0x21),
600         TWL6030_FIXED_LDO(VDAC, 0x64, 1800, 17, 0, 0x21),
601         TWL6030_FIXED_LDO(VUSB, 0x70, 3300, 18, 0, 0x21),
602         TWL6030_FIXED_RESOURCE(CLK32KG, 0x8C, 48, 0, 0x21),
603 };
604
605 static int __devinit twlreg_probe(struct platform_device *pdev)
606 {
607         int                             i;
608         struct twlreg_info              *info;
609         struct regulator_init_data      *initdata;
610         struct regulation_constraints   *c;
611         struct regulator_dev            *rdev;
612
613         for (i = 0, info = NULL; i < ARRAY_SIZE(twl_regs); i++) {
614                 if (twl_regs[i].desc.id != pdev->id)
615                         continue;
616                 info = twl_regs + i;
617                 break;
618         }
619         if (!info)
620                 return -ENODEV;
621
622         initdata = pdev->dev.platform_data;
623         if (!initdata)
624                 return -EINVAL;
625
626         /* Constrain board-specific capabilities according to what
627          * this driver and the chip itself can actually do.
628          */
629         c = &initdata->constraints;
630         c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
631         c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
632                                 | REGULATOR_CHANGE_MODE
633                                 | REGULATOR_CHANGE_STATUS;
634         switch (pdev->id) {
635         case TWL4030_REG_VIO:
636         case TWL4030_REG_VDD1:
637         case TWL4030_REG_VDD2:
638         case TWL4030_REG_VPLL1:
639         case TWL4030_REG_VINTANA1:
640         case TWL4030_REG_VINTANA2:
641         case TWL4030_REG_VINTDIG:
642                 c->always_on = true;
643                 break;
644         default:
645                 break;
646         }
647
648         rdev = regulator_register(&info->desc, &pdev->dev, initdata, info);
649         if (IS_ERR(rdev)) {
650                 dev_err(&pdev->dev, "can't register %s, %ld\n",
651                                 info->desc.name, PTR_ERR(rdev));
652                 return PTR_ERR(rdev);
653         }
654         platform_set_drvdata(pdev, rdev);
655
656         twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP,
657                                                 info->remap);
658
659         /* NOTE:  many regulators support short-circuit IRQs (presentable
660          * as REGULATOR_OVER_CURRENT notifications?) configured via:
661          *  - SC_CONFIG
662          *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
663          *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
664          *  - IT_CONFIG
665          */
666
667         return 0;
668 }
669
670 static int __devexit twlreg_remove(struct platform_device *pdev)
671 {
672         regulator_unregister(platform_get_drvdata(pdev));
673         return 0;
674 }
675
676 MODULE_ALIAS("platform:twl_reg");
677
678 static struct platform_driver twlreg_driver = {
679         .probe          = twlreg_probe,
680         .remove         = __devexit_p(twlreg_remove),
681         /* NOTE: short name, to work around driver model truncation of
682          * "twl_regulator.12" (and friends) to "twl_regulator.1".
683          */
684         .driver.name    = "twl_reg",
685         .driver.owner   = THIS_MODULE,
686 };
687
688 static int __init twlreg_init(void)
689 {
690         return platform_driver_register(&twlreg_driver);
691 }
692 subsys_initcall(twlreg_init);
693
694 static void __exit twlreg_exit(void)
695 {
696         platform_driver_unregister(&twlreg_driver);
697 }
698 module_exit(twlreg_exit)
699
700 MODULE_DESCRIPTION("TWL regulator driver");
701 MODULE_LICENSE("GPL");