1/* 2 * wm831x-ldo.c -- LDO driver for the WM831x series 3 * 4 * Copyright 2009 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14#include <linux/module.h> 15#include <linux/moduleparam.h> 16#include <linux/init.h> 17#include <linux/bitops.h> 18#include <linux/err.h> 19#include <linux/i2c.h> 20#include <linux/platform_device.h> 21#include <linux/regulator/driver.h> 22#include <linux/slab.h> 23 24#include <linux/mfd/wm831x/core.h> 25#include <linux/mfd/wm831x/regulator.h> 26#include <linux/mfd/wm831x/pdata.h> 27 28#define WM831X_LDO_MAX_NAME 9 29 30#define WM831X_LDO_CONTROL 0 31#define WM831X_LDO_ON_CONTROL 1 32#define WM831X_LDO_SLEEP_CONTROL 2 33 34#define WM831X_ALIVE_LDO_ON_CONTROL 0 35#define WM831X_ALIVE_LDO_SLEEP_CONTROL 1 36 37struct wm831x_ldo { 38 char name[WM831X_LDO_MAX_NAME]; 39 char supply_name[WM831X_LDO_MAX_NAME]; 40 struct regulator_desc desc; 41 int base; 42 struct wm831x *wm831x; 43 struct regulator_dev *regulator; 44}; 45 46/* 47 * Shared 48 */ 49 50static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data) 51{ 52 struct wm831x_ldo *ldo = data; 53 54 regulator_notifier_call_chain(ldo->regulator, 55 REGULATOR_EVENT_UNDER_VOLTAGE, 56 NULL); 57 58 return IRQ_HANDLED; 59} 60 61/* 62 * General purpose LDOs 63 */ 64 65static const struct regulator_linear_range wm831x_gp_ldo_ranges[] = { 66 REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000), 67 REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000), 68}; 69 70static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev, 71 int uV) 72{ 73 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 74 struct wm831x *wm831x = ldo->wm831x; 75 int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL; 76 77 sel = regulator_map_voltage_linear_range(rdev, uV, uV); 78 if (sel < 0) 79 return sel; 80 81 return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, sel); 82} 83 84static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev) 85{ 86 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 87 struct wm831x *wm831x = ldo->wm831x; 88 int ctrl_reg = ldo->base + WM831X_LDO_CONTROL; 89 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; 90 int ret; 91 92 ret = wm831x_reg_read(wm831x, on_reg); 93 if (ret < 0) 94 return ret; 95 96 if (!(ret & WM831X_LDO1_ON_MODE)) 97 return REGULATOR_MODE_NORMAL; 98 99 ret = wm831x_reg_read(wm831x, ctrl_reg); 100 if (ret < 0) 101 return ret; 102 103 if (ret & WM831X_LDO1_LP_MODE) 104 return REGULATOR_MODE_STANDBY; 105 else 106 return REGULATOR_MODE_IDLE; 107} 108 109static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev, 110 unsigned int mode) 111{ 112 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 113 struct wm831x *wm831x = ldo->wm831x; 114 int ctrl_reg = ldo->base + WM831X_LDO_CONTROL; 115 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; 116 int ret; 117 118 119 switch (mode) { 120 case REGULATOR_MODE_NORMAL: 121 ret = wm831x_set_bits(wm831x, on_reg, 122 WM831X_LDO1_ON_MODE, 0); 123 if (ret < 0) 124 return ret; 125 break; 126 127 case REGULATOR_MODE_IDLE: 128 ret = wm831x_set_bits(wm831x, ctrl_reg, 129 WM831X_LDO1_LP_MODE, 0); 130 if (ret < 0) 131 return ret; 132 133 ret = wm831x_set_bits(wm831x, on_reg, 134 WM831X_LDO1_ON_MODE, 135 WM831X_LDO1_ON_MODE); 136 if (ret < 0) 137 return ret; 138 break; 139 140 case REGULATOR_MODE_STANDBY: 141 ret = wm831x_set_bits(wm831x, ctrl_reg, 142 WM831X_LDO1_LP_MODE, 143 WM831X_LDO1_LP_MODE); 144 if (ret < 0) 145 return ret; 146 147 ret = wm831x_set_bits(wm831x, on_reg, 148 WM831X_LDO1_ON_MODE, 149 WM831X_LDO1_ON_MODE); 150 if (ret < 0) 151 return ret; 152 break; 153 154 default: 155 return -EINVAL; 156 } 157 158 return 0; 159} 160 161static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev) 162{ 163 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 164 struct wm831x *wm831x = ldo->wm831x; 165 int mask = 1 << rdev_get_id(rdev); 166 int ret; 167 168 /* Is the regulator on? */ 169 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS); 170 if (ret < 0) 171 return ret; 172 if (!(ret & mask)) 173 return REGULATOR_STATUS_OFF; 174 175 /* Is it reporting under voltage? */ 176 ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS); 177 if (ret < 0) 178 return ret; 179 if (ret & mask) 180 return REGULATOR_STATUS_ERROR; 181 182 ret = wm831x_gp_ldo_get_mode(rdev); 183 if (ret < 0) 184 return ret; 185 else 186 return regulator_mode_to_status(ret); 187} 188 189static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev, 190 int input_uV, 191 int output_uV, int load_uA) 192{ 193 if (load_uA < 20000) 194 return REGULATOR_MODE_STANDBY; 195 if (load_uA < 50000) 196 return REGULATOR_MODE_IDLE; 197 return REGULATOR_MODE_NORMAL; 198} 199 200 201static struct regulator_ops wm831x_gp_ldo_ops = { 202 .list_voltage = regulator_list_voltage_linear_range, 203 .map_voltage = regulator_map_voltage_linear_range, 204 .get_voltage_sel = regulator_get_voltage_sel_regmap, 205 .set_voltage_sel = regulator_set_voltage_sel_regmap, 206 .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage, 207 .get_mode = wm831x_gp_ldo_get_mode, 208 .set_mode = wm831x_gp_ldo_set_mode, 209 .get_status = wm831x_gp_ldo_get_status, 210 .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode, 211 .get_bypass = regulator_get_bypass_regmap, 212 .set_bypass = regulator_set_bypass_regmap, 213 214 .is_enabled = regulator_is_enabled_regmap, 215 .enable = regulator_enable_regmap, 216 .disable = regulator_disable_regmap, 217}; 218 219static int wm831x_gp_ldo_probe(struct platform_device *pdev) 220{ 221 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 222 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 223 struct regulator_config config = { }; 224 int id; 225 struct wm831x_ldo *ldo; 226 struct resource *res; 227 int ret, irq; 228 229 if (pdata && pdata->wm831x_num) 230 id = (pdata->wm831x_num * 10) + 1; 231 else 232 id = 0; 233 id = pdev->id - id; 234 235 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 236 237 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL); 238 if (!ldo) 239 return -ENOMEM; 240 241 ldo->wm831x = wm831x; 242 243 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 244 if (res == NULL) { 245 dev_err(&pdev->dev, "No REG resource\n"); 246 ret = -EINVAL; 247 goto err; 248 } 249 ldo->base = res->start; 250 251 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); 252 ldo->desc.name = ldo->name; 253 254 snprintf(ldo->supply_name, sizeof(ldo->supply_name), 255 "LDO%dVDD", id + 1); 256 ldo->desc.supply_name = ldo->supply_name; 257 258 ldo->desc.id = id; 259 ldo->desc.type = REGULATOR_VOLTAGE; 260 ldo->desc.n_voltages = 32; 261 ldo->desc.ops = &wm831x_gp_ldo_ops; 262 ldo->desc.owner = THIS_MODULE; 263 ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL; 264 ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK; 265 ldo->desc.enable_reg = WM831X_LDO_ENABLE; 266 ldo->desc.enable_mask = 1 << id; 267 ldo->desc.bypass_reg = ldo->base; 268 ldo->desc.bypass_mask = WM831X_LDO1_SWI; 269 ldo->desc.linear_ranges = wm831x_gp_ldo_ranges; 270 ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_gp_ldo_ranges); 271 272 config.dev = pdev->dev.parent; 273 if (pdata) 274 config.init_data = pdata->ldo[id]; 275 config.driver_data = ldo; 276 config.regmap = wm831x->regmap; 277 278 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc, 279 &config); 280 if (IS_ERR(ldo->regulator)) { 281 ret = PTR_ERR(ldo->regulator); 282 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", 283 id + 1, ret); 284 goto err; 285 } 286 287 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 288 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 289 wm831x_ldo_uv_irq, 290 IRQF_TRIGGER_RISING, ldo->name, 291 ldo); 292 if (ret != 0) { 293 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 294 irq, ret); 295 goto err; 296 } 297 298 platform_set_drvdata(pdev, ldo); 299 300 return 0; 301 302err: 303 return ret; 304} 305 306static struct platform_driver wm831x_gp_ldo_driver = { 307 .probe = wm831x_gp_ldo_probe, 308 .driver = { 309 .name = "wm831x-ldo", 310 .owner = THIS_MODULE, 311 }, 312}; 313 314/* 315 * Analogue LDOs 316 */ 317 318static const struct regulator_linear_range wm831x_aldo_ranges[] = { 319 REGULATOR_LINEAR_RANGE(1000000, 0, 12, 50000), 320 REGULATOR_LINEAR_RANGE(1700000, 13, 31, 100000), 321}; 322 323static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev, 324 int uV) 325{ 326 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 327 struct wm831x *wm831x = ldo->wm831x; 328 int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL; 329 330 sel = regulator_map_voltage_linear_range(rdev, uV, uV); 331 if (sel < 0) 332 return sel; 333 334 return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel); 335} 336 337static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev) 338{ 339 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 340 struct wm831x *wm831x = ldo->wm831x; 341 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; 342 int ret; 343 344 ret = wm831x_reg_read(wm831x, on_reg); 345 if (ret < 0) 346 return 0; 347 348 if (ret & WM831X_LDO7_ON_MODE) 349 return REGULATOR_MODE_IDLE; 350 else 351 return REGULATOR_MODE_NORMAL; 352} 353 354static int wm831x_aldo_set_mode(struct regulator_dev *rdev, 355 unsigned int mode) 356{ 357 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 358 struct wm831x *wm831x = ldo->wm831x; 359 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; 360 int ret; 361 362 363 switch (mode) { 364 case REGULATOR_MODE_NORMAL: 365 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0); 366 if (ret < 0) 367 return ret; 368 break; 369 370 case REGULATOR_MODE_IDLE: 371 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 372 WM831X_LDO7_ON_MODE); 373 if (ret < 0) 374 return ret; 375 break; 376 377 default: 378 return -EINVAL; 379 } 380 381 return 0; 382} 383 384static int wm831x_aldo_get_status(struct regulator_dev *rdev) 385{ 386 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 387 struct wm831x *wm831x = ldo->wm831x; 388 int mask = 1 << rdev_get_id(rdev); 389 int ret; 390 391 /* Is the regulator on? */ 392 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS); 393 if (ret < 0) 394 return ret; 395 if (!(ret & mask)) 396 return REGULATOR_STATUS_OFF; 397 398 /* Is it reporting under voltage? */ 399 ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS); 400 if (ret < 0) 401 return ret; 402 if (ret & mask) 403 return REGULATOR_STATUS_ERROR; 404 405 ret = wm831x_aldo_get_mode(rdev); 406 if (ret < 0) 407 return ret; 408 else 409 return regulator_mode_to_status(ret); 410} 411 412static struct regulator_ops wm831x_aldo_ops = { 413 .list_voltage = regulator_list_voltage_linear_range, 414 .map_voltage = regulator_map_voltage_linear_range, 415 .get_voltage_sel = regulator_get_voltage_sel_regmap, 416 .set_voltage_sel = regulator_set_voltage_sel_regmap, 417 .set_suspend_voltage = wm831x_aldo_set_suspend_voltage, 418 .get_mode = wm831x_aldo_get_mode, 419 .set_mode = wm831x_aldo_set_mode, 420 .get_status = wm831x_aldo_get_status, 421 .set_bypass = regulator_set_bypass_regmap, 422 .get_bypass = regulator_get_bypass_regmap, 423 424 .is_enabled = regulator_is_enabled_regmap, 425 .enable = regulator_enable_regmap, 426 .disable = regulator_disable_regmap, 427}; 428 429static int wm831x_aldo_probe(struct platform_device *pdev) 430{ 431 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 432 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 433 struct regulator_config config = { }; 434 int id; 435 struct wm831x_ldo *ldo; 436 struct resource *res; 437 int ret, irq; 438 439 if (pdata && pdata->wm831x_num) 440 id = (pdata->wm831x_num * 10) + 1; 441 else 442 id = 0; 443 id = pdev->id - id; 444 445 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 446 447 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL); 448 if (!ldo) 449 return -ENOMEM; 450 451 ldo->wm831x = wm831x; 452 453 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 454 if (res == NULL) { 455 dev_err(&pdev->dev, "No REG resource\n"); 456 ret = -EINVAL; 457 goto err; 458 } 459 ldo->base = res->start; 460 461 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); 462 ldo->desc.name = ldo->name; 463 464 snprintf(ldo->supply_name, sizeof(ldo->supply_name), 465 "LDO%dVDD", id + 1); 466 ldo->desc.supply_name = ldo->supply_name; 467 468 ldo->desc.id = id; 469 ldo->desc.type = REGULATOR_VOLTAGE; 470 ldo->desc.n_voltages = 32; 471 ldo->desc.linear_ranges = wm831x_aldo_ranges; 472 ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges); 473 ldo->desc.ops = &wm831x_aldo_ops; 474 ldo->desc.owner = THIS_MODULE; 475 ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL; 476 ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK; 477 ldo->desc.enable_reg = WM831X_LDO_ENABLE; 478 ldo->desc.enable_mask = 1 << id; 479 ldo->desc.bypass_reg = ldo->base; 480 ldo->desc.bypass_mask = WM831X_LDO7_SWI; 481 482 config.dev = pdev->dev.parent; 483 if (pdata) 484 config.init_data = pdata->ldo[id]; 485 config.driver_data = ldo; 486 config.regmap = wm831x->regmap; 487 488 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc, 489 &config); 490 if (IS_ERR(ldo->regulator)) { 491 ret = PTR_ERR(ldo->regulator); 492 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", 493 id + 1, ret); 494 goto err; 495 } 496 497 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 498 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 499 wm831x_ldo_uv_irq, 500 IRQF_TRIGGER_RISING, ldo->name, ldo); 501 if (ret != 0) { 502 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 503 irq, ret); 504 goto err; 505 } 506 507 platform_set_drvdata(pdev, ldo); 508 509 return 0; 510 511err: 512 return ret; 513} 514 515static struct platform_driver wm831x_aldo_driver = { 516 .probe = wm831x_aldo_probe, 517 .driver = { 518 .name = "wm831x-aldo", 519 .owner = THIS_MODULE, 520 }, 521}; 522 523/* 524 * Alive LDO 525 */ 526 527#define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf 528 529static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev, 530 int uV) 531{ 532 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 533 struct wm831x *wm831x = ldo->wm831x; 534 int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL; 535 536 sel = regulator_map_voltage_linear(rdev, uV, uV); 537 if (sel < 0) 538 return sel; 539 540 return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel); 541} 542 543static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev) 544{ 545 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 546 struct wm831x *wm831x = ldo->wm831x; 547 int mask = 1 << rdev_get_id(rdev); 548 int ret; 549 550 /* Is the regulator on? */ 551 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS); 552 if (ret < 0) 553 return ret; 554 if (ret & mask) 555 return REGULATOR_STATUS_ON; 556 else 557 return REGULATOR_STATUS_OFF; 558} 559 560static struct regulator_ops wm831x_alive_ldo_ops = { 561 .list_voltage = regulator_list_voltage_linear, 562 .map_voltage = regulator_map_voltage_linear, 563 .get_voltage_sel = regulator_get_voltage_sel_regmap, 564 .set_voltage_sel = regulator_set_voltage_sel_regmap, 565 .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage, 566 .get_status = wm831x_alive_ldo_get_status, 567 568 .is_enabled = regulator_is_enabled_regmap, 569 .enable = regulator_enable_regmap, 570 .disable = regulator_disable_regmap, 571}; 572 573static int wm831x_alive_ldo_probe(struct platform_device *pdev) 574{ 575 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 576 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 577 struct regulator_config config = { }; 578 int id; 579 struct wm831x_ldo *ldo; 580 struct resource *res; 581 int ret; 582 583 if (pdata && pdata->wm831x_num) 584 id = (pdata->wm831x_num * 10) + 1; 585 else 586 id = 0; 587 id = pdev->id - id; 588 589 590 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 591 592 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL); 593 if (!ldo) 594 return -ENOMEM; 595 596 ldo->wm831x = wm831x; 597 598 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 599 if (res == NULL) { 600 dev_err(&pdev->dev, "No REG resource\n"); 601 ret = -EINVAL; 602 goto err; 603 } 604 ldo->base = res->start; 605 606 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); 607 ldo->desc.name = ldo->name; 608 609 snprintf(ldo->supply_name, sizeof(ldo->supply_name), 610 "LDO%dVDD", id + 1); 611 ldo->desc.supply_name = ldo->supply_name; 612 613 ldo->desc.id = id; 614 ldo->desc.type = REGULATOR_VOLTAGE; 615 ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1; 616 ldo->desc.ops = &wm831x_alive_ldo_ops; 617 ldo->desc.owner = THIS_MODULE; 618 ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL; 619 ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK; 620 ldo->desc.enable_reg = WM831X_LDO_ENABLE; 621 ldo->desc.enable_mask = 1 << id; 622 ldo->desc.min_uV = 800000; 623 ldo->desc.uV_step = 50000; 624 ldo->desc.enable_time = 1000; 625 626 config.dev = pdev->dev.parent; 627 if (pdata) 628 config.init_data = pdata->ldo[id]; 629 config.driver_data = ldo; 630 config.regmap = wm831x->regmap; 631 632 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc, 633 &config); 634 if (IS_ERR(ldo->regulator)) { 635 ret = PTR_ERR(ldo->regulator); 636 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", 637 id + 1, ret); 638 goto err; 639 } 640 641 platform_set_drvdata(pdev, ldo); 642 643 return 0; 644 645err: 646 return ret; 647} 648 649static struct platform_driver wm831x_alive_ldo_driver = { 650 .probe = wm831x_alive_ldo_probe, 651 .driver = { 652 .name = "wm831x-alive-ldo", 653 .owner = THIS_MODULE, 654 }, 655}; 656 657static int __init wm831x_ldo_init(void) 658{ 659 int ret; 660 661 ret = platform_driver_register(&wm831x_gp_ldo_driver); 662 if (ret != 0) 663 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret); 664 665 ret = platform_driver_register(&wm831x_aldo_driver); 666 if (ret != 0) 667 pr_err("Failed to register WM831x ALDO driver: %d\n", ret); 668 669 ret = platform_driver_register(&wm831x_alive_ldo_driver); 670 if (ret != 0) 671 pr_err("Failed to register WM831x alive LDO driver: %d\n", 672 ret); 673 674 return 0; 675} 676subsys_initcall(wm831x_ldo_init); 677 678static void __exit wm831x_ldo_exit(void) 679{ 680 platform_driver_unregister(&wm831x_alive_ldo_driver); 681 platform_driver_unregister(&wm831x_aldo_driver); 682 platform_driver_unregister(&wm831x_gp_ldo_driver); 683} 684module_exit(wm831x_ldo_exit); 685 686/* Module information */ 687MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 688MODULE_DESCRIPTION("WM831x LDO driver"); 689MODULE_LICENSE("GPL"); 690MODULE_ALIAS("platform:wm831x-ldo"); 691MODULE_ALIAS("platform:wm831x-aldo"); 692MODULE_ALIAS("platform:wm831x-aliveldo"); 693