Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/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/string.h>
 14 #include <linux/slab.h>
 15 #include <linux/init.h>
 16 #include <linux/err.h>
 17 #include <linux/platform_device.h>
 18 #include <linux/of.h>
 19 #include <linux/of_device.h>
 20 #include <linux/regulator/driver.h>
 21 #include <linux/regulator/machine.h>
 22 #include <linux/regulator/of_regulator.h>
 23 #include <linux/i2c/twl.h>
 24 #include <linux/delay.h>
 25 
 26 /*
 27  * The TWL4030/TW5030/TPS659x0 family chips include power management, a
 28  * USB OTG transceiver, an RTC, ADC, PWM, and lots more.  Some versions
 29  * include an audio codec, battery charger, and more voltage regulators.
 30  * These chips are often used in OMAP-based systems.
 31  *
 32  * This driver implements software-based resource control for various
 33  * voltage regulators.  This is usually augmented with state machine
 34  * based control.
 35  */
 36 
 37 struct twlreg_info {
 38         /* start of regulator's PM_RECEIVER control register bank */
 39         u8                      base;
 40 
 41         /* twl resource ID, for resource control state machine */
 42         u8                      id;
 43 
 44         /* voltage in mV = table[VSEL]; table_len must be a power-of-two */
 45         u8                      table_len;
 46         const u16               *table;
 47 
 48         /* State REMAP default configuration */
 49         u8                      remap;
 50 
 51         /* used by regulator core */
 52         struct regulator_desc   desc;
 53 
 54         /* chip specific features */
 55         unsigned long           features;
 56 
 57         /* data passed from board for external get/set voltage */
 58         void                    *data;
 59 };
 60 
 61 
 62 /* LDO control registers ... offset is from the base of its register bank.
 63  * The first three registers of all power resource banks help hardware to
 64  * manage the various resource groups.
 65  */
 66 /* Common offset in TWL4030/6030 */
 67 #define VREG_GRP                0
 68 /* TWL4030 register offsets */
 69 #define VREG_TYPE               1
 70 #define VREG_REMAP              2
 71 #define VREG_DEDICATED          3       /* LDO control */
 72 #define VREG_VOLTAGE_SMPS_4030  9
 73 /* TWL6030 register offsets */
 74 #define VREG_TRANS              1
 75 #define VREG_STATE              2
 76 #define VREG_VOLTAGE            3
 77 #define VREG_VOLTAGE_SMPS       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 twl4030reg_is_enabled(struct regulator_dev *rdev)
122 {
123         int     state = twlreg_grp(rdev);
124 
125         if (state < 0)
126                 return state;
127 
128         return state & P1_GRP_4030;
129 }
130 
131 #define PB_I2C_BUSY     BIT(0)
132 #define PB_I2C_BWEN     BIT(1)
133 
134 /* Wait until buffer empty/ready to send a word on power bus. */
135 static int twl4030_wait_pb_ready(void)
136 {
137 
138         int     ret;
139         int     timeout = 10;
140         u8      val;
141 
142         do {
143                 ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
144                                       TWL4030_PM_MASTER_PB_CFG);
145                 if (ret < 0)
146                         return ret;
147 
148                 if (!(val & PB_I2C_BUSY))
149                         return 0;
150 
151                 mdelay(1);
152                 timeout--;
153         } while (timeout);
154 
155         return -ETIMEDOUT;
156 }
157 
158 /* Send a word over the powerbus */
159 static int twl4030_send_pb_msg(unsigned msg)
160 {
161         u8      val;
162         int     ret;
163 
164         /* save powerbus configuration */
165         ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
166                               TWL4030_PM_MASTER_PB_CFG);
167         if (ret < 0)
168                 return ret;
169 
170         /* Enable i2c access to powerbus */
171         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val | PB_I2C_BWEN,
172                                TWL4030_PM_MASTER_PB_CFG);
173         if (ret < 0)
174                 return ret;
175 
176         ret = twl4030_wait_pb_ready();
177         if (ret < 0)
178                 return ret;
179 
180         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg >> 8,
181                                TWL4030_PM_MASTER_PB_WORD_MSB);
182         if (ret < 0)
183                 return ret;
184 
185         ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg & 0xff,
186                                TWL4030_PM_MASTER_PB_WORD_LSB);
187         if (ret < 0)
188                 return ret;
189 
190         ret = twl4030_wait_pb_ready();
191         if (ret < 0)
192                 return ret;
193 
194         /* Restore powerbus configuration */
195         return twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val,
196                                 TWL4030_PM_MASTER_PB_CFG);
197 }
198 
199 static int twl4030reg_enable(struct regulator_dev *rdev)
200 {
201         struct twlreg_info      *info = rdev_get_drvdata(rdev);
202         int                     grp;
203         int                     ret;
204 
205         grp = twlreg_grp(rdev);
206         if (grp < 0)
207                 return grp;
208 
209         grp |= P1_GRP_4030;
210 
211         ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
212 
213         return ret;
214 }
215 
216 static int twl4030reg_disable(struct regulator_dev *rdev)
217 {
218         struct twlreg_info      *info = rdev_get_drvdata(rdev);
219         int                     grp;
220         int                     ret;
221 
222         grp = twlreg_grp(rdev);
223         if (grp < 0)
224                 return grp;
225 
226         grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
227 
228         ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
229 
230         return ret;
231 }
232 
233 static int twl4030reg_get_status(struct regulator_dev *rdev)
234 {
235         int     state = twlreg_grp(rdev);
236 
237         if (state < 0)
238                 return state;
239         state &= 0x0f;
240 
241         /* assume state != WARM_RESET; we'd not be running...  */
242         if (!state)
243                 return REGULATOR_STATUS_OFF;
244         return (state & BIT(3))
245                 ? REGULATOR_STATUS_NORMAL
246                 : REGULATOR_STATUS_STANDBY;
247 }
248 
249 static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
250 {
251         struct twlreg_info      *info = rdev_get_drvdata(rdev);
252         unsigned                message;
253 
254         /* We can only set the mode through state machine commands... */
255         switch (mode) {
256         case REGULATOR_MODE_NORMAL:
257                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
258                 break;
259         case REGULATOR_MODE_STANDBY:
260                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
261                 break;
262         default:
263                 return -EINVAL;
264         }
265 
266         return twl4030_send_pb_msg(message);
267 }
268 
269 static inline unsigned int twl4030reg_map_mode(unsigned int mode)
270 {
271         switch (mode) {
272         case RES_STATE_ACTIVE:
273                 return REGULATOR_MODE_NORMAL;
274         case RES_STATE_SLEEP:
275                 return REGULATOR_MODE_STANDBY;
276         default:
277                 return -EINVAL;
278         }
279 }
280 
281 /*----------------------------------------------------------------------*/
282 
283 /*
284  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
285  * select field in its control register.   We use tables indexed by VSEL
286  * to record voltages in milliVolts.  (Accuracy is about three percent.)
287  *
288  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
289  * currently handled by listing two slightly different VAUX2 regulators,
290  * only one of which will be configured.
291  *
292  * VSEL values documented as "TI cannot support these values" are flagged
293  * in these tables as UNSUP() values; we normally won't assign them.
294  *
295  * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
296  * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
297  */
298 #define UNSUP_MASK      0x8000
299 
300 #define UNSUP(x)        (UNSUP_MASK | (x))
301 #define IS_UNSUP(info, x)                       \
302         ((UNSUP_MASK & (x)) &&                  \
303          !((info)->features & TWL4030_ALLOW_UNSUPPORTED))
304 #define LDO_MV(x)       (~UNSUP_MASK & (x))
305 
306 
307 static const u16 VAUX1_VSEL_table[] = {
308         UNSUP(1500), UNSUP(1800), 2500, 2800,
309         3000, 3000, 3000, 3000,
310 };
311 static const u16 VAUX2_4030_VSEL_table[] = {
312         UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
313         1500, 1800, UNSUP(1850), 2500,
314         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
315         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
316 };
317 static const u16 VAUX2_VSEL_table[] = {
318         1700, 1700, 1900, 1300,
319         1500, 1800, 2000, 2500,
320         2100, 2800, 2200, 2300,
321         2400, 2400, 2400, 2400,
322 };
323 static const u16 VAUX3_VSEL_table[] = {
324         1500, 1800, 2500, 2800,
325         3000, 3000, 3000, 3000,
326 };
327 static const u16 VAUX4_VSEL_table[] = {
328         700, 1000, 1200, UNSUP(1300),
329         1500, 1800, UNSUP(1850), 2500,
330         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
331         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
332 };
333 static const u16 VMMC1_VSEL_table[] = {
334         1850, 2850, 3000, 3150,
335 };
336 static const u16 VMMC2_VSEL_table[] = {
337         UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
338         UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
339         2600, 2800, 2850, 3000,
340         3150, 3150, 3150, 3150,
341 };
342 static const u16 VPLL1_VSEL_table[] = {
343         1000, 1200, 1300, 1800,
344         UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
345 };
346 static const u16 VPLL2_VSEL_table[] = {
347         700, 1000, 1200, 1300,
348         UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
349         UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
350         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
351 };
352 static const u16 VSIM_VSEL_table[] = {
353         UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
354         2800, 3000, 3000, 3000,
355 };
356 static const u16 VDAC_VSEL_table[] = {
357         1200, 1300, 1800, 1800,
358 };
359 static const u16 VIO_VSEL_table[] = {
360         1800, 1850,
361 };
362 static const u16 VINTANA2_VSEL_table[] = {
363         2500, 2750,
364 };
365 
366 static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
367 {
368         struct twlreg_info      *info = rdev_get_drvdata(rdev);
369         int                     mV = info->table[index];
370 
371         return IS_UNSUP(info, mV) ? 0 : (LDO_MV(mV) * 1000);
372 }
373 
374 static int
375 twl4030ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
376 {
377         struct twlreg_info      *info = rdev_get_drvdata(rdev);
378 
379         return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE,
380                             selector);
381 }
382 
383 static int twl4030ldo_get_voltage_sel(struct regulator_dev *rdev)
384 {
385         struct twlreg_info      *info = rdev_get_drvdata(rdev);
386         int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE);
387 
388         if (vsel < 0)
389                 return vsel;
390 
391         vsel &= info->table_len - 1;
392         return vsel;
393 }
394 
395 static struct regulator_ops twl4030ldo_ops = {
396         .list_voltage   = twl4030ldo_list_voltage,
397 
398         .set_voltage_sel = twl4030ldo_set_voltage_sel,
399         .get_voltage_sel = twl4030ldo_get_voltage_sel,
400 
401         .enable         = twl4030reg_enable,
402         .disable        = twl4030reg_disable,
403         .is_enabled     = twl4030reg_is_enabled,
404 
405         .set_mode       = twl4030reg_set_mode,
406 
407         .get_status     = twl4030reg_get_status,
408 };
409 
410 static int
411 twl4030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
412                         unsigned *selector)
413 {
414         struct twlreg_info *info = rdev_get_drvdata(rdev);
415         int vsel = DIV_ROUND_UP(min_uV - 600000, 12500);
416 
417         twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS_4030, vsel);
418 
419         return 0;
420 }
421 
422 static int twl4030smps_get_voltage(struct regulator_dev *rdev)
423 {
424         struct twlreg_info *info = rdev_get_drvdata(rdev);
425         int vsel;
426 
427         vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
428                 VREG_VOLTAGE_SMPS_4030);
429 
430         return vsel * 12500 + 600000;
431 }
432 
433 static struct regulator_ops twl4030smps_ops = {
434         .set_voltage    = twl4030smps_set_voltage,
435         .get_voltage    = twl4030smps_get_voltage,
436 };
437 
438 /*----------------------------------------------------------------------*/
439 
440 static struct regulator_ops twl4030fixed_ops = {
441         .list_voltage   = regulator_list_voltage_linear,
442 
443         .enable         = twl4030reg_enable,
444         .disable        = twl4030reg_disable,
445         .is_enabled     = twl4030reg_is_enabled,
446 
447         .set_mode       = twl4030reg_set_mode,
448 
449         .get_status     = twl4030reg_get_status,
450 };
451 
452 /*----------------------------------------------------------------------*/
453 
454 #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) \
455 static const struct twlreg_info TWL4030_INFO_##label = { \
456         .base = offset, \
457         .id = num, \
458         .table_len = ARRAY_SIZE(label##_VSEL_table), \
459         .table = label##_VSEL_table, \
460         .remap = remap_conf, \
461         .desc = { \
462                 .name = #label, \
463                 .id = TWL4030_REG_##label, \
464                 .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
465                 .ops = &twl4030ldo_ops, \
466                 .type = REGULATOR_VOLTAGE, \
467                 .owner = THIS_MODULE, \
468                 .enable_time = turnon_delay, \
469                 .of_map_mode = twl4030reg_map_mode, \
470                 }, \
471         }
472 
473 #define TWL4030_ADJUSTABLE_SMPS(label, offset, num, turnon_delay, remap_conf) \
474 static const struct twlreg_info TWL4030_INFO_##label = { \
475         .base = offset, \
476         .id = num, \
477         .remap = remap_conf, \
478         .desc = { \
479                 .name = #label, \
480                 .id = TWL4030_REG_##label, \
481                 .ops = &twl4030smps_ops, \
482                 .type = REGULATOR_VOLTAGE, \
483                 .owner = THIS_MODULE, \
484                 .enable_time = turnon_delay, \
485                 .of_map_mode = twl4030reg_map_mode, \
486                 }, \
487         }
488 
489 #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
490                         remap_conf) \
491 static const struct twlreg_info TWLFIXED_INFO_##label = { \
492         .base = offset, \
493         .id = num, \
494         .remap = remap_conf, \
495         .desc = { \
496                 .name = #label, \
497                 .id = TWL4030##_REG_##label, \
498                 .n_voltages = 1, \
499                 .ops = &twl4030fixed_ops, \
500                 .type = REGULATOR_VOLTAGE, \
501                 .owner = THIS_MODULE, \
502                 .min_uV = mVolts * 1000, \
503                 .enable_time = turnon_delay, \
504                 .of_map_mode = twl4030reg_map_mode, \
505                 }, \
506         }
507 
508 /*
509  * We list regulators here if systems need some level of
510  * software control over them after boot.
511  */
512 TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08);
513 TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08);
514 TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08);
515 TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08);
516 TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08);
517 TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08);
518 TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08);
519 TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00);
520 TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08);
521 TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00);
522 TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08);
523 TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08);
524 TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08);
525 TWL4030_ADJUSTABLE_SMPS(VDD1, 0x55, 15, 1000, 0x08);
526 TWL4030_ADJUSTABLE_SMPS(VDD2, 0x63, 16, 1000, 0x08);
527 /* VUSBCP is managed *only* by the USB subchip */
528 TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08);
529 TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08);
530 TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08);
531 TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08);
532 TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08);
533 
534 #define TWL_OF_MATCH(comp, family, label) \
535         { \
536                 .compatible = comp, \
537                 .data = &family##_INFO_##label, \
538         }
539 
540 #define TWL4030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL4030, label)
541 #define TWL6030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6030, label)
542 #define TWL6032_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6032, label)
543 #define TWLFIXED_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLFIXED, label)
544 #define TWLSMPS_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLSMPS, label)
545 
546 static const struct of_device_id twl_of_match[] = {
547         TWL4030_OF_MATCH("ti,twl4030-vaux1", VAUX1),
548         TWL4030_OF_MATCH("ti,twl4030-vaux2", VAUX2_4030),
549         TWL4030_OF_MATCH("ti,twl5030-vaux2", VAUX2),
550         TWL4030_OF_MATCH("ti,twl4030-vaux3", VAUX3),
551         TWL4030_OF_MATCH("ti,twl4030-vaux4", VAUX4),
552         TWL4030_OF_MATCH("ti,twl4030-vmmc1", VMMC1),
553         TWL4030_OF_MATCH("ti,twl4030-vmmc2", VMMC2),
554         TWL4030_OF_MATCH("ti,twl4030-vpll1", VPLL1),
555         TWL4030_OF_MATCH("ti,twl4030-vpll2", VPLL2),
556         TWL4030_OF_MATCH("ti,twl4030-vsim", VSIM),
557         TWL4030_OF_MATCH("ti,twl4030-vdac", VDAC),
558         TWL4030_OF_MATCH("ti,twl4030-vintana2", VINTANA2),
559         TWL4030_OF_MATCH("ti,twl4030-vio", VIO),
560         TWL4030_OF_MATCH("ti,twl4030-vdd1", VDD1),
561         TWL4030_OF_MATCH("ti,twl4030-vdd2", VDD2),
562         TWLFIXED_OF_MATCH("ti,twl4030-vintana1", VINTANA1),
563         TWLFIXED_OF_MATCH("ti,twl4030-vintdig", VINTDIG),
564         TWLFIXED_OF_MATCH("ti,twl4030-vusb1v5", VUSB1V5),
565         TWLFIXED_OF_MATCH("ti,twl4030-vusb1v8", VUSB1V8),
566         TWLFIXED_OF_MATCH("ti,twl4030-vusb3v1", VUSB3V1),
567         {},
568 };
569 MODULE_DEVICE_TABLE(of, twl_of_match);
570 
571 static int twlreg_probe(struct platform_device *pdev)
572 {
573         int id;
574         struct twlreg_info              *info;
575         const struct twlreg_info        *template;
576         struct regulator_init_data      *initdata;
577         struct regulation_constraints   *c;
578         struct regulator_dev            *rdev;
579         const struct of_device_id       *match;
580         struct regulator_config         config = { };
581 
582         match = of_match_device(twl_of_match, &pdev->dev);
583         if (!match)
584                 return -ENODEV;
585 
586         template = match->data;
587         if (!template)
588                 return -ENODEV;
589 
590         id = template->desc.id;
591         initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
592                                                 &template->desc);
593         if (!initdata)
594                 return -EINVAL;
595 
596         info = devm_kmemdup(&pdev->dev, template, sizeof(*info), GFP_KERNEL);
597         if (!info)
598                 return -ENOMEM;
599 
600         /* Constrain board-specific capabilities according to what
601          * this driver and the chip itself can actually do.
602          */
603         c = &initdata->constraints;
604         c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
605         c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
606                                 | REGULATOR_CHANGE_MODE
607                                 | REGULATOR_CHANGE_STATUS;
608         switch (id) {
609         case TWL4030_REG_VIO:
610         case TWL4030_REG_VDD1:
611         case TWL4030_REG_VDD2:
612         case TWL4030_REG_VPLL1:
613         case TWL4030_REG_VINTANA1:
614         case TWL4030_REG_VINTANA2:
615         case TWL4030_REG_VINTDIG:
616                 c->always_on = true;
617                 break;
618         default:
619                 break;
620         }
621 
622         config.dev = &pdev->dev;
623         config.init_data = initdata;
624         config.driver_data = info;
625         config.of_node = pdev->dev.of_node;
626 
627         rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
628         if (IS_ERR(rdev)) {
629                 dev_err(&pdev->dev, "can't register %s, %ld\n",
630                                 info->desc.name, PTR_ERR(rdev));
631                 return PTR_ERR(rdev);
632         }
633         platform_set_drvdata(pdev, rdev);
634 
635         twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP, info->remap);
636 
637         /* NOTE:  many regulators support short-circuit IRQs (presentable
638          * as REGULATOR_OVER_CURRENT notifications?) configured via:
639          *  - SC_CONFIG
640          *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
641          *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
642          *  - IT_CONFIG
643          */
644 
645         return 0;
646 }
647 
648 MODULE_ALIAS("platform:twl4030_reg");
649 
650 static struct platform_driver twlreg_driver = {
651         .probe          = twlreg_probe,
652         /* NOTE: short name, to work around driver model truncation of
653          * "twl_regulator.12" (and friends) to "twl_regulator.1".
654          */
655         .driver  = {
656                 .name  = "twl4030_reg",
657                 .of_match_table = of_match_ptr(twl_of_match),
658         },
659 };
660 
661 static int __init twlreg_init(void)
662 {
663         return platform_driver_register(&twlreg_driver);
664 }
665 subsys_initcall(twlreg_init);
666 
667 static void __exit twlreg_exit(void)
668 {
669         platform_driver_unregister(&twlreg_driver);
670 }
671 module_exit(twlreg_exit)
672 
673 MODULE_DESCRIPTION("TWL4030 regulator driver");
674 MODULE_LICENSE("GPL");
675 

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