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, 0x15 /* PB_WORD_MSB */ );
 223         if (status >= 0)
 224                 return status;
 225
 226         return twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
 227                         message, 0x16 /* 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 {
 334         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 335         int                     vsel;
 336
 337         for (vsel = 0; vsel < info->table_len; vsel++) {
 338                 int mV = info->table[vsel];
 339                 int uV;
 340
 341                 if (IS_UNSUP(mV))
 342                         continue;
 343                 uV = LDO_MV(mV) * 1000;
 344
 345                 /* REVISIT for VAUX2, first match may not be best/lowest */
 346
 347                 /* use the first in-range value */
 348                 if (min_uV <= uV && uV <= max_uV)
 349                         return twlreg_write(info, TWL_MODULE_PM_RECEIVER,
 350                                                         VREG_VOLTAGE, vsel);
 351         }
 352
 353         return -EDOM;
 354 }
 355
 356 static int twl4030ldo_get_voltage(struct regulator_dev *rdev)
 357 {
 358         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 359         int             vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
 360                                                                 VREG_VOLTAGE);
 361
 362         if (vsel < 0)
 363                 return vsel;
 364
 365         vsel &= info->table_len - 1;
 366         return LDO_MV(info->table[vsel]) * 1000;
 367 }
 368
 369 static struct regulator_ops twl4030ldo_ops = {
 370         .list_voltage   = twl4030ldo_list_voltage,
 371
 372         .set_voltage    = twl4030ldo_set_voltage,
 373         .get_voltage    = twl4030ldo_get_voltage,
 374
 375         .enable         = twlreg_enable,
 376         .disable        = twlreg_disable,
 377         .is_enabled     = twlreg_is_enabled,
 378
 379         .set_mode       = twlreg_set_mode,
 380
 381         .get_status     = twlreg_get_status,
 382 };
 383
 384 static int twl6030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
 385 {
 386         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 387
 388         return ((info->min_mV + (index * 100)) * 1000);
 389 }
 390
 391 static int
 392 twl6030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
 393 {
 394         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 395         int                     vsel;
 396
 397         if ((min_uV/1000 < info->min_mV) || (max_uV/1000 > info->max_mV))
 398                 return -EDOM;
 399
 400         /*
 401          * Use the below formula to calculate vsel
 402          * mV = 1000mv + 100mv * (vsel - 1)
 403          */
 404         vsel = (min_uV/1000 - 1000)/100 + 1;
 405         return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE, vsel);
 406
 407 }
 408
 409 static int twl6030ldo_get_voltage(struct regulator_dev *rdev)
 410 {
 411         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 412         int             vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
 413                                                                 VREG_VOLTAGE);
 414
 415         if (vsel < 0)
 416                 return vsel;
 417
 418         /*
 419          * Use the below formula to calculate vsel
 420          * mV = 1000mv + 100mv * (vsel - 1)
 421          */
 422         return (1000 + (100 * (vsel - 1))) * 1000;
 423 }
 424
 425 static struct regulator_ops twl6030ldo_ops = {
 426         .list_voltage   = twl6030ldo_list_voltage,
 427
 428         .set_voltage    = twl6030ldo_set_voltage,
 429         .get_voltage    = twl6030ldo_get_voltage,
 430
 431         .enable         = twlreg_enable,
 432         .disable        = twlreg_disable,
 433         .is_enabled     = twlreg_is_enabled,
 434
 435         .set_mode       = twlreg_set_mode,
 436
 437         .get_status     = twlreg_get_status,
 438 };
 439
 440 /*----------------------------------------------------------------------*/
 441
 442 /*
 443  * Fixed voltage LDOs don't have a VSEL field to update.
 444  */
 445 static int twlfixed_list_voltage(struct regulator_dev *rdev, unsigned index)
 446 {
 447         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 448
 449         return info->min_mV * 1000;
 450 }
 451
 452 static int twlfixed_get_voltage(struct regulator_dev *rdev)
 453 {
 454         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 455
 456         return info->min_mV * 1000;
 457 }
 458
 459 static struct regulator_ops twlfixed_ops = {
 460         .list_voltage   = twlfixed_list_voltage,
 461
 462         .get_voltage    = twlfixed_get_voltage,
 463
 464         .enable         = twlreg_enable,
 465         .disable        = twlreg_disable,
 466         .is_enabled     = twlreg_is_enabled,
 467
 468         .set_mode       = twlreg_set_mode,
 469
 470         .get_status     = twlreg_get_status,
 471 };
 472
 473 /*----------------------------------------------------------------------*/
 474
 475 #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 476                         remap_conf) \
 477                 TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 478                         remap_conf, TWL4030)
 479 #define TWL6030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 480                         remap_conf) \
 481                 TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
 482                         remap_conf, TWL6030)
 483
 484 #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) { \
 485         .base = offset, \
 486         .id = num, \
 487         .table_len = ARRAY_SIZE(label##_VSEL_table), \
 488         .table = label##_VSEL_table, \
 489         .delay = turnon_delay, \
 490         .remap = remap_conf, \
 491         .desc = { \
 492                 .name = #label, \
 493                 .id = TWL4030_REG_##label, \
 494                 .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
 495                 .ops = &twl4030ldo_ops, \
 496                 .type = REGULATOR_VOLTAGE, \
 497                 .owner = THIS_MODULE, \
 498                 }, \
 499         }
 500
 501 #define TWL6030_ADJUSTABLE_LDO(label, offset, min_mVolts, max_mVolts, num, \
 502                 remap_conf) { \
 503         .base = offset, \
 504         .id = num, \
 505         .min_mV = min_mVolts, \
 506         .max_mV = max_mVolts, \
 507         .remap = remap_conf, \
 508         .desc = { \
 509                 .name = #label, \
 510                 .id = TWL6030_REG_##label, \
 511                 .n_voltages = (max_mVolts - min_mVolts)/100, \
 512                 .ops = &twl6030ldo_ops, \
 513                 .type = REGULATOR_VOLTAGE, \
 514                 .owner = THIS_MODULE, \
 515                 }, \
 516         }
 517
 518
 519 #define TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, remap_conf, \
 520                 family) { \
 521         .base = offset, \
 522         .id = num, \
 523         .min_mV = mVolts, \
 524         .delay = turnon_delay, \
 525         .remap = remap_conf, \
 526         .desc = { \
 527                 .name = #label, \
 528                 .id = family##_REG_##label, \
 529                 .n_voltages = 1, \
 530                 .ops = &twlfixed_ops, \
 531                 .type = REGULATOR_VOLTAGE, \
 532                 .owner = THIS_MODULE, \
 533                 }, \
 534         }
 535
 536 /*
 537  * We list regulators here if systems need some level of
 538  * software control over them after boot.
 539  */
 540 static struct twlreg_info twl_regs[] = {
 541         TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08),
 542         TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08),
 543         TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08),
 544         TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08),
 545         TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08),
 546         TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08),
 547         TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08),
 548         TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00),
 549         TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08),
 550         TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00),
 551         TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08),
 552         TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08),
 553         TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08),
 554         TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08),
 555         TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08),
 556         TWL4030_ADJUSTABLE_LDO(VDD1, 0x55, 15, 1000, 0x08),
 557         TWL4030_ADJUSTABLE_LDO(VDD2, 0x63, 16, 1000, 0x08),
 558         TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08),
 559         TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08),
 560         TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08),
 561         /* VUSBCP is managed *only* by the USB subchip */
 562
 563         /* 6030 REG with base as PMC Slave Misc : 0x0030 */
 564         /* Turnon-delay and remap configuration values for 6030 are not
 565            verified since the specification is not public */
 566         TWL6030_ADJUSTABLE_LDO(VAUX1_6030, 0x54, 1000, 3300, 1, 0x21),
 567         TWL6030_ADJUSTABLE_LDO(VAUX2_6030, 0x58, 1000, 3300, 2, 0x21),
 568         TWL6030_ADJUSTABLE_LDO(VAUX3_6030, 0x5c, 1000, 3300, 3, 0x21),
 569         TWL6030_ADJUSTABLE_LDO(VMMC, 0x68, 1000, 3300, 4, 0x21),
 570         TWL6030_ADJUSTABLE_LDO(VPP, 0x6c, 1000, 3300, 5, 0x21),
 571         TWL6030_ADJUSTABLE_LDO(VUSIM, 0x74, 1000, 3300, 7, 0x21),
 572         TWL6030_FIXED_LDO(VANA, 0x50, 2100, 15, 0, 0x21),
 573         TWL6030_FIXED_LDO(VCXIO, 0x60, 1800, 16, 0, 0x21),
 574         TWL6030_FIXED_LDO(VDAC, 0x64, 1800, 17, 0, 0x21),
 575         TWL6030_FIXED_LDO(VUSB, 0x70, 3300, 18, 0, 0x21)
 576 };
 577
 578 static int __devinit twlreg_probe(struct platform_device *pdev)
 579 {
 580         int                             i;
 581         struct twlreg_info              *info;
 582         struct regulator_init_data      *initdata;
 583         struct regulation_constraints   *c;
 584         struct regulator_dev            *rdev;
 585
 586         for (i = 0, info = NULL; i < ARRAY_SIZE(twl_regs); i++) {
 587                 if (twl_regs[i].desc.id != pdev->id)
 588                         continue;
 589                 info = twl_regs + i;
 590                 break;
 591         }
 592         if (!info)
 593                 return -ENODEV;
 594
 595         initdata = pdev->dev.platform_data;
 596         if (!initdata)
 597                 return -EINVAL;
 598
 599         /* Constrain board-specific capabilities according to what
 600          * this driver and the chip itself can actually do.
 601          */
 602         c = &initdata->constraints;
 603         c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
 604         c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
 605                                 | REGULATOR_CHANGE_MODE
 606                                 | REGULATOR_CHANGE_STATUS;
 607         switch (pdev->id) {
 608         case TWL4030_REG_VIO:
 609         case TWL4030_REG_VDD1:
 610         case TWL4030_REG_VDD2:
 611         case TWL4030_REG_VPLL1:
 612         case TWL4030_REG_VINTANA1:
 613         case TWL4030_REG_VINTANA2:
 614         case TWL4030_REG_VINTDIG:
 615                 c->always_on = true;
 616                 break;
 617         default:
 618                 break;
 619         }
 620
 621         rdev = regulator_register(&info->desc, &pdev->dev, initdata, info);
 622         if (IS_ERR(rdev)) {
 623                 dev_err(&pdev->dev, "can't register %s, %ld\n",
 624                                 info->desc.name, PTR_ERR(rdev));
 625                 return PTR_ERR(rdev);
 626         }
 627         platform_set_drvdata(pdev, rdev);
 628
 629         twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP,
 630                                                 info->remap);
 631
 632         /* NOTE:  many regulators support short-circuit IRQs (presentable
 633          * as REGULATOR_OVER_CURRENT notifications?) configured via:
 634          *  - SC_CONFIG
 635          *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
 636          *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
 637          *  - IT_CONFIG
 638          */
 639
 640         return 0;
 641 }
 642
 643 static int __devexit twlreg_remove(struct platform_device *pdev)
 644 {
 645         regulator_unregister(platform_get_drvdata(pdev));
 646         return 0;
 647 }
 648
 649 MODULE_ALIAS("platform:twl_reg");
 650
 651 static struct platform_driver twlreg_driver = {
 652         .probe          = twlreg_probe,
 653         .remove         = __devexit_p(twlreg_remove),
 654         /* NOTE: short name, to work around driver model truncation of
 655          * "twl_regulator.12" (and friends) to "twl_regulator.1".
 656          */
 657         .driver.name    = "twl_reg",
 658         .driver.owner   = THIS_MODULE,
 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("TWL regulator driver");
 674 MODULE_LICENSE("GPL");