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 37 struct 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 50 static 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 65 static 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 70 static 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 84 static 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 } 108 109 static 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 } 160 161 static 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 } 188 189 static 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 } 199 200 201 static 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 }; 218 219 static 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 == NULL) { 239 dev_err(&pdev->dev, "Unable to allocate private data\n"); 240 return -ENOMEM; 241 } 242 243 ldo->wm831x = wm831x; 244 245 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 246 if (res == NULL) { 247 dev_err(&pdev->dev, "No REG resource\n"); 248 ret = -EINVAL; 249 goto err; 250 } 251 ldo->base = res->start; 252 253 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); 254 ldo->desc.name = ldo->name; 255 256 snprintf(ldo->supply_name, sizeof(ldo->supply_name), 257 "LDO%dVDD", id + 1); 258 ldo->desc.supply_name = ldo->supply_name; 259 260 ldo->desc.id = id; 261 ldo->desc.type = REGULATOR_VOLTAGE; 262 ldo->desc.n_voltages = 32; 263 ldo->desc.ops = &wm831x_gp_ldo_ops; 264 ldo->desc.owner = THIS_MODULE; 265 ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL; 266 ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK; 267 ldo->desc.enable_reg = WM831X_LDO_ENABLE; 268 ldo->desc.enable_mask = 1 << id; 269 ldo->desc.bypass_reg = ldo->base; 270 ldo->desc.bypass_mask = WM831X_LDO1_SWI; 271 ldo->desc.linear_ranges = wm831x_gp_ldo_ranges; 272 ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_gp_ldo_ranges); 273 274 config.dev = pdev->dev.parent; 275 if (pdata) 276 config.init_data = pdata->ldo[id]; 277 config.driver_data = ldo; 278 config.regmap = wm831x->regmap; 279 280 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc, 281 &config); 282 if (IS_ERR(ldo->regulator)) { 283 ret = PTR_ERR(ldo->regulator); 284 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", 285 id + 1, ret); 286 goto err; 287 } 288 289 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 290 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 291 wm831x_ldo_uv_irq, 292 IRQF_TRIGGER_RISING, ldo->name, 293 ldo); 294 if (ret != 0) { 295 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 296 irq, ret); 297 goto err; 298 } 299 300 platform_set_drvdata(pdev, ldo); 301 302 return 0; 303 304 err: 305 return ret; 306 } 307 308 static struct platform_driver wm831x_gp_ldo_driver = { 309 .probe = wm831x_gp_ldo_probe, 310 .driver = { 311 .name = "wm831x-ldo", 312 .owner = THIS_MODULE, 313 }, 314 }; 315 316 /* 317 * Analogue LDOs 318 */ 319 320 static const struct regulator_linear_range wm831x_aldo_ranges[] = { 321 REGULATOR_LINEAR_RANGE(1000000, 0, 12, 50000), 322 REGULATOR_LINEAR_RANGE(1700000, 13, 31, 100000), 323 }; 324 325 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev, 326 int uV) 327 { 328 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 329 struct wm831x *wm831x = ldo->wm831x; 330 int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL; 331 332 sel = regulator_map_voltage_linear_range(rdev, uV, uV); 333 if (sel < 0) 334 return sel; 335 336 return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel); 337 } 338 339 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev) 340 { 341 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 342 struct wm831x *wm831x = ldo->wm831x; 343 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; 344 int ret; 345 346 ret = wm831x_reg_read(wm831x, on_reg); 347 if (ret < 0) 348 return 0; 349 350 if (ret & WM831X_LDO7_ON_MODE) 351 return REGULATOR_MODE_IDLE; 352 else 353 return REGULATOR_MODE_NORMAL; 354 } 355 356 static int wm831x_aldo_set_mode(struct regulator_dev *rdev, 357 unsigned int mode) 358 { 359 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 360 struct wm831x *wm831x = ldo->wm831x; 361 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; 362 int ret; 363 364 365 switch (mode) { 366 case REGULATOR_MODE_NORMAL: 367 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0); 368 if (ret < 0) 369 return ret; 370 break; 371 372 case REGULATOR_MODE_IDLE: 373 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 374 WM831X_LDO7_ON_MODE); 375 if (ret < 0) 376 return ret; 377 break; 378 379 default: 380 return -EINVAL; 381 } 382 383 return 0; 384 } 385 386 static int wm831x_aldo_get_status(struct regulator_dev *rdev) 387 { 388 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 389 struct wm831x *wm831x = ldo->wm831x; 390 int mask = 1 << rdev_get_id(rdev); 391 int ret; 392 393 /* Is the regulator on? */ 394 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS); 395 if (ret < 0) 396 return ret; 397 if (!(ret & mask)) 398 return REGULATOR_STATUS_OFF; 399 400 /* Is it reporting under voltage? */ 401 ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS); 402 if (ret < 0) 403 return ret; 404 if (ret & mask) 405 return REGULATOR_STATUS_ERROR; 406 407 ret = wm831x_aldo_get_mode(rdev); 408 if (ret < 0) 409 return ret; 410 else 411 return regulator_mode_to_status(ret); 412 } 413 414 static struct regulator_ops wm831x_aldo_ops = { 415 .list_voltage = regulator_list_voltage_linear_range, 416 .map_voltage = regulator_map_voltage_linear_range, 417 .get_voltage_sel = regulator_get_voltage_sel_regmap, 418 .set_voltage_sel = regulator_set_voltage_sel_regmap, 419 .set_suspend_voltage = wm831x_aldo_set_suspend_voltage, 420 .get_mode = wm831x_aldo_get_mode, 421 .set_mode = wm831x_aldo_set_mode, 422 .get_status = wm831x_aldo_get_status, 423 .set_bypass = regulator_set_bypass_regmap, 424 .get_bypass = regulator_get_bypass_regmap, 425 426 .is_enabled = regulator_is_enabled_regmap, 427 .enable = regulator_enable_regmap, 428 .disable = regulator_disable_regmap, 429 }; 430 431 static int wm831x_aldo_probe(struct platform_device *pdev) 432 { 433 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 434 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 435 struct regulator_config config = { }; 436 int id; 437 struct wm831x_ldo *ldo; 438 struct resource *res; 439 int ret, irq; 440 441 if (pdata && pdata->wm831x_num) 442 id = (pdata->wm831x_num * 10) + 1; 443 else 444 id = 0; 445 id = pdev->id - id; 446 447 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 448 449 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL); 450 if (ldo == NULL) { 451 dev_err(&pdev->dev, "Unable to allocate private data\n"); 452 return -ENOMEM; 453 } 454 455 ldo->wm831x = wm831x; 456 457 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 458 if (res == NULL) { 459 dev_err(&pdev->dev, "No REG resource\n"); 460 ret = -EINVAL; 461 goto err; 462 } 463 ldo->base = res->start; 464 465 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); 466 ldo->desc.name = ldo->name; 467 468 snprintf(ldo->supply_name, sizeof(ldo->supply_name), 469 "LDO%dVDD", id + 1); 470 ldo->desc.supply_name = ldo->supply_name; 471 472 ldo->desc.id = id; 473 ldo->desc.type = REGULATOR_VOLTAGE; 474 ldo->desc.n_voltages = 32; 475 ldo->desc.linear_ranges = wm831x_aldo_ranges; 476 ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges); 477 ldo->desc.ops = &wm831x_aldo_ops; 478 ldo->desc.owner = THIS_MODULE; 479 ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL; 480 ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK; 481 ldo->desc.enable_reg = WM831X_LDO_ENABLE; 482 ldo->desc.enable_mask = 1 << id; 483 ldo->desc.bypass_reg = ldo->base; 484 ldo->desc.bypass_mask = WM831X_LDO7_SWI; 485 486 config.dev = pdev->dev.parent; 487 if (pdata) 488 config.init_data = pdata->ldo[id]; 489 config.driver_data = ldo; 490 config.regmap = wm831x->regmap; 491 492 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc, 493 &config); 494 if (IS_ERR(ldo->regulator)) { 495 ret = PTR_ERR(ldo->regulator); 496 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", 497 id + 1, ret); 498 goto err; 499 } 500 501 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 502 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 503 wm831x_ldo_uv_irq, 504 IRQF_TRIGGER_RISING, ldo->name, ldo); 505 if (ret != 0) { 506 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 507 irq, ret); 508 goto err; 509 } 510 511 platform_set_drvdata(pdev, ldo); 512 513 return 0; 514 515 err: 516 return ret; 517 } 518 519 static struct platform_driver wm831x_aldo_driver = { 520 .probe = wm831x_aldo_probe, 521 .driver = { 522 .name = "wm831x-aldo", 523 .owner = THIS_MODULE, 524 }, 525 }; 526 527 /* 528 * Alive LDO 529 */ 530 531 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf 532 533 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev, 534 int uV) 535 { 536 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 537 struct wm831x *wm831x = ldo->wm831x; 538 int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL; 539 540 sel = regulator_map_voltage_linear(rdev, uV, uV); 541 if (sel < 0) 542 return sel; 543 544 return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel); 545 } 546 547 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev) 548 { 549 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); 550 struct wm831x *wm831x = ldo->wm831x; 551 int mask = 1 << rdev_get_id(rdev); 552 int ret; 553 554 /* Is the regulator on? */ 555 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS); 556 if (ret < 0) 557 return ret; 558 if (ret & mask) 559 return REGULATOR_STATUS_ON; 560 else 561 return REGULATOR_STATUS_OFF; 562 } 563 564 static struct regulator_ops wm831x_alive_ldo_ops = { 565 .list_voltage = regulator_list_voltage_linear, 566 .map_voltage = regulator_map_voltage_linear, 567 .get_voltage_sel = regulator_get_voltage_sel_regmap, 568 .set_voltage_sel = regulator_set_voltage_sel_regmap, 569 .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage, 570 .get_status = wm831x_alive_ldo_get_status, 571 572 .is_enabled = regulator_is_enabled_regmap, 573 .enable = regulator_enable_regmap, 574 .disable = regulator_disable_regmap, 575 }; 576 577 static int wm831x_alive_ldo_probe(struct platform_device *pdev) 578 { 579 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 580 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 581 struct regulator_config config = { }; 582 int id; 583 struct wm831x_ldo *ldo; 584 struct resource *res; 585 int ret; 586 587 if (pdata && pdata->wm831x_num) 588 id = (pdata->wm831x_num * 10) + 1; 589 else 590 id = 0; 591 id = pdev->id - id; 592 593 594 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 595 596 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL); 597 if (ldo == NULL) { 598 dev_err(&pdev->dev, "Unable to allocate private data\n"); 599 return -ENOMEM; 600 } 601 602 ldo->wm831x = wm831x; 603 604 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 605 if (res == NULL) { 606 dev_err(&pdev->dev, "No REG resource\n"); 607 ret = -EINVAL; 608 goto err; 609 } 610 ldo->base = res->start; 611 612 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); 613 ldo->desc.name = ldo->name; 614 615 snprintf(ldo->supply_name, sizeof(ldo->supply_name), 616 "LDO%dVDD", id + 1); 617 ldo->desc.supply_name = ldo->supply_name; 618 619 ldo->desc.id = id; 620 ldo->desc.type = REGULATOR_VOLTAGE; 621 ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1; 622 ldo->desc.ops = &wm831x_alive_ldo_ops; 623 ldo->desc.owner = THIS_MODULE; 624 ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL; 625 ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK; 626 ldo->desc.enable_reg = WM831X_LDO_ENABLE; 627 ldo->desc.enable_mask = 1 << id; 628 ldo->desc.min_uV = 800000; 629 ldo->desc.uV_step = 50000; 630 ldo->desc.enable_time = 1000; 631 632 config.dev = pdev->dev.parent; 633 if (pdata) 634 config.init_data = pdata->ldo[id]; 635 config.driver_data = ldo; 636 config.regmap = wm831x->regmap; 637 638 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc, 639 &config); 640 if (IS_ERR(ldo->regulator)) { 641 ret = PTR_ERR(ldo->regulator); 642 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", 643 id + 1, ret); 644 goto err; 645 } 646 647 platform_set_drvdata(pdev, ldo); 648 649 return 0; 650 651 err: 652 return ret; 653 } 654 655 static struct platform_driver wm831x_alive_ldo_driver = { 656 .probe = wm831x_alive_ldo_probe, 657 .driver = { 658 .name = "wm831x-alive-ldo", 659 .owner = THIS_MODULE, 660 }, 661 }; 662 663 static int __init wm831x_ldo_init(void) 664 { 665 int ret; 666 667 ret = platform_driver_register(&wm831x_gp_ldo_driver); 668 if (ret != 0) 669 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret); 670 671 ret = platform_driver_register(&wm831x_aldo_driver); 672 if (ret != 0) 673 pr_err("Failed to register WM831x ALDO driver: %d\n", ret); 674 675 ret = platform_driver_register(&wm831x_alive_ldo_driver); 676 if (ret != 0) 677 pr_err("Failed to register WM831x alive LDO driver: %d\n", 678 ret); 679 680 return 0; 681 } 682 subsys_initcall(wm831x_ldo_init); 683 684 static void __exit wm831x_ldo_exit(void) 685 { 686 platform_driver_unregister(&wm831x_alive_ldo_driver); 687 platform_driver_unregister(&wm831x_aldo_driver); 688 platform_driver_unregister(&wm831x_gp_ldo_driver); 689 } 690 module_exit(wm831x_ldo_exit); 691 692 /* Module information */ 693 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 694 MODULE_DESCRIPTION("WM831x LDO driver"); 695 MODULE_LICENSE("GPL"); 696 MODULE_ALIAS("platform:wm831x-ldo"); 697 MODULE_ALIAS("platform:wm831x-aldo"); 698 MODULE_ALIAS("platform:wm831x-aliveldo"); 699