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
  53         /* used by regulator core */
  54         struct regulator_desc   desc;
  55 };
  56
  57
  58 /* LDO control registers ... offset is from the base of its register bank.
  59  * The first three registers of all power resource banks help hardware to
  60  * manage the various resource groups.
  61  */
  62 /* Common offset in TWL4030/6030 */
  63 #define VREG_GRP                0
  64 /* TWL4030 register offsets */
  65 #define VREG_TYPE               1
  66 #define VREG_REMAP              2
  67 #define VREG_DEDICATED          3       /* LDO control */
  68 /* TWL6030 register offsets */
  69 #define VREG_TRANS              1
  70 #define VREG_STATE              2
  71 #define VREG_VOLTAGE            3
  72 /* TWL6030 Misc register offsets */
  73 #define VREG_BC_ALL             1
  74 #define VREG_BC_REF             2
  75 #define VREG_BC_PROC            3
  76 #define VREG_BC_CLK_RST         4
  77
  78 static inline int
  79 twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
  80 {
  81         u8 value;
  82         int status;
  83
  84         status = twl_i2c_read_u8(slave_subgp,
  85                         &value, info->base + offset);
  86         return (status < 0) ? status : value;
  87 }
  88
  89 static inline int
  90 twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset,
  91                                                  u8 value)
  92 {
  93         return twl_i2c_write_u8(slave_subgp,
  94                         value, info->base + offset);
  95 }
  96
  97 /*----------------------------------------------------------------------*/
  98
  99 /* generic power resource operations, which work on all regulators */
 100
 101 static int twlreg_grp(struct regulator_dev *rdev)
 102 {
 103         return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER,
 104                                                                  VREG_GRP);
 105 }
 106
 107 /*
 108  * Enable/disable regulators by joining/leaving the P1 (processor) group.
 109  * We assume nobody else is updating the DEV_GRP registers.
 110  */
 111 /* definition for 4030 family */
 112 #define P3_GRP_4030     BIT(7)          /* "peripherals" */
 113 #define P2_GRP_4030     BIT(6)          /* secondary processor, modem, etc */
 114 #define P1_GRP_4030     BIT(5)          /* CPU/Linux */
 115 /* definition for 6030 family */
 116 #define P3_GRP_6030     BIT(2)          /* secondary processor, modem, etc */
 117 #define P2_GRP_6030     BIT(1)          /* "peripherals" */
 118 #define P1_GRP_6030     BIT(0)          /* CPU/Linux */
 119
 120 static int twlreg_is_enabled(struct regulator_dev *rdev)
 121 {
 122         int     state = twlreg_grp(rdev);
 123
 124         if (state < 0)
 125                 return state;
 126
 127         if (twl_class_is_4030())
 128                 state &= P1_GRP_4030;
 129         else
 130                 state &= P1_GRP_6030;
 131         return state;
 132 }
 133
 134 static int twlreg_enable(struct regulator_dev *rdev)
 135 {
 136         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 137         int                     grp;
 138         int                     ret;
 139
 140         grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
 141         if (grp < 0)
 142                 return grp;
 143
 144         if (twl_class_is_4030())
 145                 grp |= P1_GRP_4030;
 146         else
 147                 grp |= P1_GRP_6030;
 148
 149         ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
 150
 151         udelay(info->delay);
 152
 153         return ret;
 154 }
 155
 156 static int twlreg_disable(struct regulator_dev *rdev)
 157 {
 158         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 159         int                     grp;
 160
 161         grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
 162         if (grp < 0)
 163                 return grp;
 164
 165         if (twl_class_is_4030())
 166                 grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
 167         else
 168                 grp &= ~(P1_GRP_6030 | P2_GRP_6030 | P3_GRP_6030);
 169
 170         return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
 171 }
 172
 173 static int twlreg_get_status(struct regulator_dev *rdev)
 174 {
 175         int     state = twlreg_grp(rdev);
 176
 177         if (twl_class_is_6030())
 178                 return 0; /* FIXME return for 6030 regulator */
 179
 180         if (state < 0)
 181                 return state;
 182         state &= 0x0f;
 183
 184         /* assume state != WARM_RESET; we'd not be running...  */
 185         if (!state)
 186                 return REGULATOR_STATUS_OFF;
 187         return (state & BIT(3))
 188                 ? REGULATOR_STATUS_NORMAL
 189                 : REGULATOR_STATUS_STANDBY;
 190 }
 191
 192 static int twlreg_set_mode(struct regulator_dev *rdev, unsigned mode)
 193 {
 194         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 195         unsigned                message;
 196         int                     status;
 197
 198         if (twl_class_is_6030())
 199                 return 0; /* FIXME return for 6030 regulator */
 200
 201         /* We can only set the mode through state machine commands... */
 202         switch (mode) {
 203         case REGULATOR_MODE_NORMAL:
 204                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
 205                 break;
 206         case REGULATOR_MODE_STANDBY:
 207                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
 208                 break;
 209         default:
 210                 return -EINVAL;
 211         }
 212
 213         /* Ensure the resource is associated with some group */
 214         status = twlreg_grp(rdev);
 215         if (status < 0)
 216                 return status;
 217         if (!(status & (P3_GRP_4030 | P2_GRP_4030 | P1_GRP_4030)))
 218                 return -EACCES;
 219
 220         status = twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
 221                         message >> 8, 0x15 /* PB_WORD_MSB */ );
 222         if (status >= 0)
 223                 return status;
 224
 225         return twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
 226                         message, 0x16 /* PB_WORD_LSB */ );
 227 }
 228
 229 /*----------------------------------------------------------------------*/
 230
 231 /*
 232  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
 233  * select field in its control register.   We use tables indexed by VSEL
 234  * to record voltages in milliVolts.  (Accuracy is about three percent.)
 235  *
 236  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
 237  * currently handled by listing two slightly different VAUX2 regulators,
 238  * only one of which will be configured.
 239  *
 240  * VSEL values documented as "TI cannot support these values" are flagged
 241  * in these tables as UNSUP() values; we normally won't assign them.
 242  *
 243  * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
 244  * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
 245  */
 246 #ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED
 247 #define UNSUP_MASK      0x0000
 248 #else
 249 #define UNSUP_MASK      0x8000
 250 #endif
 251
 252 #define UNSUP(x)        (UNSUP_MASK | (x))
 253 #define IS_UNSUP(x)     (UNSUP_MASK & (x))
 254 #define LDO_MV(x)       (~UNSUP_MASK & (x))
 255
 256
 257 static const u16 VAUX1_VSEL_table[] = {
 258         UNSUP(1500), UNSUP(1800), 2500, 2800,
 259         3000, 3000, 3000, 3000,
 260 };
 261 static const u16 VAUX2_4030_VSEL_table[] = {
 262         UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
 263         1500, 1800, UNSUP(1850), 2500,
 264         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 265         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 266 };
 267 static const u16 VAUX2_VSEL_table[] = {
 268         1700, 1700, 1900, 1300,
 269         1500, 1800, 2000, 2500,
 270         2100, 2800, 2200, 2300,
 271         2400, 2400, 2400, 2400,
 272 };
 273 static const u16 VAUX3_VSEL_table[] = {
 274         1500, 1800, 2500, 2800,
 275         3000, 3000, 3000, 3000,
 276 };
 277 static const u16 VAUX4_VSEL_table[] = {
 278         700, 1000, 1200, UNSUP(1300),
 279         1500, 1800, UNSUP(1850), 2500,
 280         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 281         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 282 };
 283 static const u16 VMMC1_VSEL_table[] = {
 284         1850, 2850, 3000, 3150,
 285 };
 286 static const u16 VMMC2_VSEL_table[] = {
 287         UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
 288         UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
 289         2600, 2800, 2850, 3000,
 290         3150, 3150, 3150, 3150,
 291 };
 292 static const u16 VPLL1_VSEL_table[] = {
 293         1000, 1200, 1300, 1800,
 294         UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
 295 };
 296 static const u16 VPLL2_VSEL_table[] = {
 297         700, 1000, 1200, 1300,
 298         UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
 299         UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
 300         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 301 };
 302 static const u16 VSIM_VSEL_table[] = {
 303         UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
 304         2800, 3000, 3000, 3000,
 305 };
 306 static const u16 VDAC_VSEL_table[] = {
 307         1200, 1300, 1800, 1800,
 308 };
 309 static const u16 VDD1_VSEL_table[] = {
 310         800, 1450,
 311 };
 312 static const u16 VDD2_VSEL_table[] = {
 313         800, 1450, 1500,
 314 };
 315 static const u16 VIO_VSEL_table[] = {
 316         1800, 1850,
 317 };
 318 static const u16 VINTANA2_VSEL_table[] = {
 319         2500, 2750,
 320 };
 321 static const u16 VAUX1_6030_VSEL_table[] = {
 322         1000, 1300, 1800, 2500,
 323         2800, 2900, 3000, 3000,
 324 };
 325 static const u16 VAUX2_6030_VSEL_table[] = {
 326         1200, 1800, 2500, 2750,
 327         2800, 2800, 2800, 2800,
 328 };
 329 static const u16 VAUX3_6030_VSEL_table[] = {
 330         1000, 1200, 1300, 1800,
 331         2500, 2800, 3000, 3000,
 332 };
 333 static const u16 VMMC_VSEL_table[] = {
 334         1200, 1800, 2800, 2900,
 335         3000, 3000, 3000, 3000,
 336 };
 337 static const u16 VPP_VSEL_table[] = {
 338         1800, 1900, 2000, 2100,
 339         2200, 2300, 2400, 2500,
 340 };
 341 static const u16 VUSIM_VSEL_table[] = {
 342         1200, 1800, 2500, 2900,
 343 };
 344
 345 static int twlldo_list_voltage(struct regulator_dev *rdev, unsigned index)
 346 {
 347         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 348         int                     mV = info->table[index];
 349
 350         return IS_UNSUP(mV) ? 0 : (LDO_MV(mV) * 1000);
 351 }
 352
 353 static int
 354 twlldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
 355 {
 356         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 357         int                     vsel;
 358
 359         for (vsel = 0; vsel < info->table_len; vsel++) {
 360                 int mV = info->table[vsel];
 361                 int uV;
 362
 363                 if (IS_UNSUP(mV))
 364                         continue;
 365                 uV = LDO_MV(mV) * 1000;
 366
 367                 /* REVISIT for VAUX2, first match may not be best/lowest */
 368
 369                 /* use the first in-range value */
 370                 if (min_uV <= uV && uV <= max_uV)
 371                         return twlreg_write(info, TWL_MODULE_PM_RECEIVER,
 372                                                         VREG_VOLTAGE, vsel);
 373         }
 374
 375         return -EDOM;
 376 }
 377
 378 static int twlldo_get_voltage(struct regulator_dev *rdev)
 379 {
 380         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 381         int             vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
 382                                                                 VREG_VOLTAGE);
 383
 384         if (vsel < 0)
 385                 return vsel;
 386
 387         vsel &= info->table_len - 1;
 388         return LDO_MV(info->table[vsel]) * 1000;
 389 }
 390
 391 static struct regulator_ops twlldo_ops = {
 392         .list_voltage   = twlldo_list_voltage,
 393
 394         .set_voltage    = twlldo_set_voltage,
 395         .get_voltage    = twlldo_get_voltage,
 396
 397         .enable         = twlreg_enable,
 398         .disable        = twlreg_disable,
 399         .is_enabled     = twlreg_is_enabled,
 400
 401         .set_mode       = twlreg_set_mode,
 402
 403         .get_status     = twlreg_get_status,
 404 };
 405
 406 /*----------------------------------------------------------------------*/
 407
 408 /*
 409  * Fixed voltage LDOs don't have a VSEL field to update.
 410  */
 411 static int twlfixed_list_voltage(struct regulator_dev *rdev, unsigned index)
 412 {
 413         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 414
 415         return info->min_mV * 1000;
 416 }
 417
 418 static int twlfixed_get_voltage(struct regulator_dev *rdev)
 419 {
 420         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 421
 422         return info->min_mV * 1000;
 423 }
 424
 425 static struct regulator_ops twlfixed_ops = {
 426         .list_voltage   = twlfixed_list_voltage,
 427
 428         .get_voltage    = twlfixed_get_voltage,
 429
 430         .enable         = twlreg_enable,
 431         .disable        = twlreg_disable,
 432         .is_enabled     = twlreg_is_enabled,
 433
 434         .set_mode       = twlreg_set_mode,
 435
 436         .get_status     = twlreg_get_status,
 437 };
 438
 439 /*----------------------------------------------------------------------*/
 440
 441 #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) \
 442                 TWL_ADJUSTABLE_LDO(label, offset, num, turnon_delay, \
 443                         remap_conf, TWL4030)
 444 #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 445                         remap_conf) \
 446                 TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 447                         remap_conf, TWL4030)
 448 #define TWL6030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, \
 449                         remap_conf) \
 450                 TWL_ADJUSTABLE_LDO(label, offset, num, turnon_delay, \
 451                         remap_conf, TWL6030)
 452 #define TWL6030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 453                         remap_conf) \
 454                 TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 455                         remap_conf, TWL6030)
 456
 457 #define TWL_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf, \
 458                 family) { \
 459         .base = offset, \
 460         .id = num, \
 461         .table_len = ARRAY_SIZE(label##_VSEL_table), \
 462         .table = label##_VSEL_table, \
 463         .delay = turnon_delay, \
 464         .remap = remap_conf, \
 465         .desc = { \
 466                 .name = #label, \
 467                 .id = family##_REG_##label, \
 468                 .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
 469                 .ops = &twlldo_ops, \
 470                 .type = REGULATOR_VOLTAGE, \
 471                 .owner = THIS_MODULE, \
 472                 }, \
 473         }
 474
 475 #define TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, remap_conf, \
 476                 family) { \
 477         .base = offset, \
 478         .id = num, \
 479         .min_mV = mVolts, \
 480         .delay = turnon_delay, \
 481         .remap = remap_conf, \
 482         .desc = { \
 483                 .name = #label, \
 484                 .id = family##_REG_##label, \
 485                 .n_voltages = 1, \
 486                 .ops = &twlfixed_ops, \
 487                 .type = REGULATOR_VOLTAGE, \
 488                 .owner = THIS_MODULE, \
 489                 }, \
 490         }
 491
 492 /*
 493  * We list regulators here if systems need some level of
 494  * software control over them after boot.
 495  */
 496 static struct twlreg_info twl_regs[] = {
 497         TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08),
 498         TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08),
 499         TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08),
 500         TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08),
 501         TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08),
 502         TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08),
 503         TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08),
 504         TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00),
 505         TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08),
 506         TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00),
 507         TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08),
 508         TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08),
 509         TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08),
 510         TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08),
 511         TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08),
 512         TWL4030_ADJUSTABLE_LDO(VDD1, 0x55, 15, 1000, 0x08),
 513         TWL4030_ADJUSTABLE_LDO(VDD2, 0x63, 16, 1000, 0x08),
 514         TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08),
 515         TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08),
 516         TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08),
 517         /* VUSBCP is managed *only* by the USB subchip */
 518
 519         /* 6030 REG with base as PMC Slave Misc : 0x0030 */
 520         /* Turnon-delay and remap configuration values for 6030 are not
 521            verified since the specification is not public */
 522         TWL6030_ADJUSTABLE_LDO(VAUX1_6030, 0x54, 1, 0, 0x08),
 523         TWL6030_ADJUSTABLE_LDO(VAUX2_6030, 0x58, 2, 0, 0x08),
 524         TWL6030_ADJUSTABLE_LDO(VAUX3_6030, 0x5c, 3, 0, 0x08),
 525         TWL6030_ADJUSTABLE_LDO(VMMC, 0x68, 4, 0, 0x08),
 526         TWL6030_ADJUSTABLE_LDO(VPP, 0x6c, 5, 0, 0x08),
 527         TWL6030_ADJUSTABLE_LDO(VUSIM, 0x74, 7, 0, 0x08),
 528         TWL6030_FIXED_LDO(VANA, 0x50, 2100, 15, 0, 0x08),
 529         TWL6030_FIXED_LDO(VCXIO, 0x60, 1800, 16, 0, 0x08),
 530         TWL6030_FIXED_LDO(VDAC, 0x64, 1800, 17, 0, 0x08),
 531         TWL6030_FIXED_LDO(VUSB, 0x70, 3300, 18, 0, 0x08)
 532 };
 533
 534 static int twlreg_probe(struct platform_device *pdev)
 535 {
 536         int                             i;
 537         struct twlreg_info              *info;
 538         struct regulator_init_data      *initdata;
 539         struct regulation_constraints   *c;
 540         struct regulator_dev            *rdev;
 541
 542         for (i = 0, info = NULL; i < ARRAY_SIZE(twl_regs); i++) {
 543                 if (twl_regs[i].desc.id != pdev->id)
 544                         continue;
 545                 info = twl_regs + i;
 546                 break;
 547         }
 548         if (!info)
 549                 return -ENODEV;
 550
 551         initdata = pdev->dev.platform_data;
 552         if (!initdata)
 553                 return -EINVAL;
 554
 555         /* Constrain board-specific capabilities according to what
 556          * this driver and the chip itself can actually do.
 557          */
 558         c = &initdata->constraints;
 559         c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
 560         c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
 561                                 | REGULATOR_CHANGE_MODE
 562                                 | REGULATOR_CHANGE_STATUS;
 563         switch (pdev->id) {
 564         case TWL4030_REG_VIO:
 565         case TWL4030_REG_VDD1:
 566         case TWL4030_REG_VDD2:
 567         case TWL4030_REG_VPLL1:
 568         case TWL4030_REG_VINTANA1:
 569         case TWL4030_REG_VINTANA2:
 570         case TWL4030_REG_VINTDIG:
 571                 c->always_on = true;
 572                 break;
 573         default:
 574                 break;
 575         }
 576
 577         rdev = regulator_register(&info->desc, &pdev->dev, initdata, info);
 578         if (IS_ERR(rdev)) {
 579                 dev_err(&pdev->dev, "can't register %s, %ld\n",
 580                                 info->desc.name, PTR_ERR(rdev));
 581                 return PTR_ERR(rdev);
 582         }
 583         platform_set_drvdata(pdev, rdev);
 584
 585         twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP,
 586                                                 info->remap);
 587
 588         /* NOTE:  many regulators support short-circuit IRQs (presentable
 589          * as REGULATOR_OVER_CURRENT notifications?) configured via:
 590          *  - SC_CONFIG
 591          *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
 592          *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
 593          *  - IT_CONFIG
 594          */
 595
 596         return 0;
 597 }
 598
 599 static int __devexit twlreg_remove(struct platform_device *pdev)
 600 {
 601         regulator_unregister(platform_get_drvdata(pdev));
 602         return 0;
 603 }
 604
 605 MODULE_ALIAS("platform:twl_reg");
 606
 607 static struct platform_driver twlreg_driver = {
 608         .probe          = twlreg_probe,
 609         .remove         = __devexit_p(twlreg_remove),
 610         /* NOTE: short name, to work around driver model truncation of
 611          * "twl_regulator.12" (and friends) to "twl_regulator.1".
 612          */
 613         .driver.name    = "twl_reg",
 614         .driver.owner   = THIS_MODULE,
 615 };
 616
 617 static int __init twlreg_init(void)
 618 {
 619         return platform_driver_register(&twlreg_driver);
 620 }
 621 subsys_initcall(twlreg_init);
 622
 623 static void __exit twlreg_exit(void)
 624 {
 625         platform_driver_unregister(&twlreg_driver);
 626 }
 627 module_exit(twlreg_exit)
 628
 629 MODULE_DESCRIPTION("TWL regulator driver");
 630 MODULE_LICENSE("GPL");