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 }, 311}; 312 313/* 314 * Analogue LDOs 315 */ 316 317static const struct regulator_linear_range wm831x_aldo_ranges[] = { 318 REGULATOR_LINEAR_RANGE(1000000, 0, 12, 50000), 319 REGULATOR_LINEAR_RANGE(1700000, 13, 31, 100000), 320}; 321 322static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev, 323 int uV) 324{ 325 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 326 struct wm831x *wm831x = ldo->wm831x; 327 int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL; 328 329 sel = regulator_map_voltage_linear_range(rdev, uV, uV); 330 if (sel < 0) 331 return sel; 332 333 return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel); 334} 335 336static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev) 337{ 338 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 339 struct wm831x *wm831x = ldo->wm831x; 340 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; 341 int ret; 342 343 ret = wm831x_reg_read(wm831x, on_reg); 344 if (ret < 0) 345 return 0; 346 347 if (ret & WM831X_LDO7_ON_MODE) 348 return REGULATOR_MODE_IDLE; 349 else 350 return REGULATOR_MODE_NORMAL; 351} 352 353static int wm831x_aldo_set_mode(struct regulator_dev *rdev, 354 unsigned int mode) 355{ 356 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 357 struct wm831x *wm831x = ldo->wm831x; 358 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; 359 int ret; 360 361 362 switch (mode) { 363 case REGULATOR_MODE_NORMAL: 364 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0); 365 if (ret < 0) 366 return ret; 367 break; 368 369 case REGULATOR_MODE_IDLE: 370 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 371 WM831X_LDO7_ON_MODE); 372 if (ret < 0) 373 return ret; 374 break; 375 376 default: 377 return -EINVAL; 378 } 379 380 return 0; 381} 382 383static int wm831x_aldo_get_status(struct regulator_dev *rdev) 384{ 385 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 386 struct wm831x *wm831x = ldo->wm831x; 387 int mask = 1 << rdev_get_id(rdev); 388 int ret; 389 390 /* Is the regulator on? */ 391 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS); 392 if (ret < 0) 393 return ret; 394 if (!(ret & mask)) 395 return REGULATOR_STATUS_OFF; 396 397 /* Is it reporting under voltage? */ 398 ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS); 399 if (ret < 0) 400 return ret; 401 if (ret & mask) 402 return REGULATOR_STATUS_ERROR; 403 404 ret = wm831x_aldo_get_mode(rdev); 405 if (ret < 0) 406 return ret; 407 else 408 return regulator_mode_to_status(ret); 409} 410 411static struct regulator_ops wm831x_aldo_ops = { 412 .list_voltage = regulator_list_voltage_linear_range, 413 .map_voltage = regulator_map_voltage_linear_range, 414 .get_voltage_sel = regulator_get_voltage_sel_regmap, 415 .set_voltage_sel = regulator_set_voltage_sel_regmap, 416 .set_suspend_voltage = wm831x_aldo_set_suspend_voltage, 417 .get_mode = wm831x_aldo_get_mode, 418 .set_mode = wm831x_aldo_set_mode, 419 .get_status = wm831x_aldo_get_status, 420 .set_bypass = regulator_set_bypass_regmap, 421 .get_bypass = regulator_get_bypass_regmap, 422 423 .is_enabled = regulator_is_enabled_regmap, 424 .enable = regulator_enable_regmap, 425 .disable = regulator_disable_regmap, 426}; 427 428static int wm831x_aldo_probe(struct platform_device *pdev) 429{ 430 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 431 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 432 struct regulator_config config = { }; 433 int id; 434 struct wm831x_ldo *ldo; 435 struct resource *res; 436 int ret, irq; 437 438 if (pdata && pdata->wm831x_num) 439 id = (pdata->wm831x_num * 10) + 1; 440 else 441 id = 0; 442 id = pdev->id - id; 443 444 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 445 446 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL); 447 if (!ldo) 448 return -ENOMEM; 449 450 ldo->wm831x = wm831x; 451 452 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 453 if (res == NULL) { 454 dev_err(&pdev->dev, "No REG resource\n"); 455 ret = -EINVAL; 456 goto err; 457 } 458 ldo->base = res->start; 459 460 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); 461 ldo->desc.name = ldo->name; 462 463 snprintf(ldo->supply_name, sizeof(ldo->supply_name), 464 "LDO%dVDD", id + 1); 465 ldo->desc.supply_name = ldo->supply_name; 466 467 ldo->desc.id = id; 468 ldo->desc.type = REGULATOR_VOLTAGE; 469 ldo->desc.n_voltages = 32; 470 ldo->desc.linear_ranges = wm831x_aldo_ranges; 471 ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges); 472 ldo->desc.ops = &wm831x_aldo_ops; 473 ldo->desc.owner = THIS_MODULE; 474 ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL; 475 ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK; 476 ldo->desc.enable_reg = WM831X_LDO_ENABLE; 477 ldo->desc.enable_mask = 1 << id; 478 ldo->desc.bypass_reg = ldo->base; 479 ldo->desc.bypass_mask = WM831X_LDO7_SWI; 480 481 config.dev = pdev->dev.parent; 482 if (pdata) 483 config.init_data = pdata->ldo[id]; 484 config.driver_data = ldo; 485 config.regmap = wm831x->regmap; 486 487 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc, 488 &config); 489 if (IS_ERR(ldo->regulator)) { 490 ret = PTR_ERR(ldo->regulator); 491 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", 492 id + 1, ret); 493 goto err; 494 } 495 496 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 497 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 498 wm831x_ldo_uv_irq, 499 IRQF_TRIGGER_RISING, ldo->name, ldo); 500 if (ret != 0) { 501 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 502 irq, ret); 503 goto err; 504 } 505 506 platform_set_drvdata(pdev, ldo); 507 508 return 0; 509 510err: 511 return ret; 512} 513 514static struct platform_driver wm831x_aldo_driver = { 515 .probe = wm831x_aldo_probe, 516 .driver = { 517 .name = "wm831x-aldo", 518 }, 519}; 520 521/* 522 * Alive LDO 523 */ 524 525#define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf 526 527static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev, 528 int uV) 529{ 530 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 531 struct wm831x *wm831x = ldo->wm831x; 532 int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL; 533 534 sel = regulator_map_voltage_linear(rdev, uV, uV); 535 if (sel < 0) 536 return sel; 537 538 return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel); 539} 540 541static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev) 542{ 543 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 544 struct wm831x *wm831x = ldo->wm831x; 545 int mask = 1 << rdev_get_id(rdev); 546 int ret; 547 548 /* Is the regulator on? */ 549 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS); 550 if (ret < 0) 551 return ret; 552 if (ret & mask) 553 return REGULATOR_STATUS_ON; 554 else 555 return REGULATOR_STATUS_OFF; 556} 557 558static struct regulator_ops wm831x_alive_ldo_ops = { 559 .list_voltage = regulator_list_voltage_linear, 560 .map_voltage = regulator_map_voltage_linear, 561 .get_voltage_sel = regulator_get_voltage_sel_regmap, 562 .set_voltage_sel = regulator_set_voltage_sel_regmap, 563 .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage, 564 .get_status = wm831x_alive_ldo_get_status, 565 566 .is_enabled = regulator_is_enabled_regmap, 567 .enable = regulator_enable_regmap, 568 .disable = regulator_disable_regmap, 569}; 570 571static int wm831x_alive_ldo_probe(struct platform_device *pdev) 572{ 573 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 574 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 575 struct regulator_config config = { }; 576 int id; 577 struct wm831x_ldo *ldo; 578 struct resource *res; 579 int ret; 580 581 if (pdata && pdata->wm831x_num) 582 id = (pdata->wm831x_num * 10) + 1; 583 else 584 id = 0; 585 id = pdev->id - id; 586 587 588 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 589 590 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL); 591 if (!ldo) 592 return -ENOMEM; 593 594 ldo->wm831x = wm831x; 595 596 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 597 if (res == NULL) { 598 dev_err(&pdev->dev, "No REG resource\n"); 599 ret = -EINVAL; 600 goto err; 601 } 602 ldo->base = res->start; 603 604 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); 605 ldo->desc.name = ldo->name; 606 607 snprintf(ldo->supply_name, sizeof(ldo->supply_name), 608 "LDO%dVDD", id + 1); 609 ldo->desc.supply_name = ldo->supply_name; 610 611 ldo->desc.id = id; 612 ldo->desc.type = REGULATOR_VOLTAGE; 613 ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1; 614 ldo->desc.ops = &wm831x_alive_ldo_ops; 615 ldo->desc.owner = THIS_MODULE; 616 ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL; 617 ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK; 618 ldo->desc.enable_reg = WM831X_LDO_ENABLE; 619 ldo->desc.enable_mask = 1 << id; 620 ldo->desc.min_uV = 800000; 621 ldo->desc.uV_step = 50000; 622 ldo->desc.enable_time = 1000; 623 624 config.dev = pdev->dev.parent; 625 if (pdata) 626 config.init_data = pdata->ldo[id]; 627 config.driver_data = ldo; 628 config.regmap = wm831x->regmap; 629 630 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc, 631 &config); 632 if (IS_ERR(ldo->regulator)) { 633 ret = PTR_ERR(ldo->regulator); 634 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", 635 id + 1, ret); 636 goto err; 637 } 638 639 platform_set_drvdata(pdev, ldo); 640 641 return 0; 642 643err: 644 return ret; 645} 646 647static struct platform_driver wm831x_alive_ldo_driver = { 648 .probe = wm831x_alive_ldo_probe, 649 .driver = { 650 .name = "wm831x-alive-ldo", 651 }, 652}; 653 654static int __init wm831x_ldo_init(void) 655{ 656 int ret; 657 658 ret = platform_driver_register(&wm831x_gp_ldo_driver); 659 if (ret != 0) 660 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret); 661 662 ret = platform_driver_register(&wm831x_aldo_driver); 663 if (ret != 0) 664 pr_err("Failed to register WM831x ALDO driver: %d\n", ret); 665 666 ret = platform_driver_register(&wm831x_alive_ldo_driver); 667 if (ret != 0) 668 pr_err("Failed to register WM831x alive LDO driver: %d\n", 669 ret); 670 671 return 0; 672} 673subsys_initcall(wm831x_ldo_init); 674 675static void __exit wm831x_ldo_exit(void) 676{ 677 platform_driver_unregister(&wm831x_alive_ldo_driver); 678 platform_driver_unregister(&wm831x_aldo_driver); 679 platform_driver_unregister(&wm831x_gp_ldo_driver); 680} 681module_exit(wm831x_ldo_exit); 682 683/* Module information */ 684MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 685MODULE_DESCRIPTION("WM831x LDO driver"); 686MODULE_LICENSE("GPL"); 687MODULE_ALIAS("platform:wm831x-ldo"); 688MODULE_ALIAS("platform:wm831x-aldo"); 689MODULE_ALIAS("platform:wm831x-aliveldo"); 690