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"); 631