1 /* 2 * wm831x-dcdc.c -- DC-DC buck convertor 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 23 #include <linux/mfd/wm831x/core.h> 24 #include <linux/mfd/wm831x/regulator.h> 25 #include <linux/mfd/wm831x/pdata.h> 26 27 #define WM831X_BUCKV_MAX_SELECTOR 0x68 28 #define WM831X_BUCKP_MAX_SELECTOR 0x66 29 30 #define WM831X_DCDC_MODE_FAST 0 31 #define WM831X_DCDC_MODE_NORMAL 1 32 #define WM831X_DCDC_MODE_IDLE 2 33 #define WM831X_DCDC_MODE_STANDBY 3 34 35 #define WM831X_DCDC_MAX_NAME 6 36 37 /* Register offsets in control block */ 38 #define WM831X_DCDC_CONTROL_1 0 39 #define WM831X_DCDC_CONTROL_2 1 40 #define WM831X_DCDC_ON_CONFIG 2 41 #define WM831X_DCDC_SLEEP_CONTROL 3 42 43 /* 44 * Shared 45 */ 46 47 struct wm831x_dcdc { 48 char name[WM831X_DCDC_MAX_NAME]; 49 struct regulator_desc desc; 50 int base; 51 struct wm831x *wm831x; 52 struct regulator_dev *regulator; 53 }; 54 55 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev) 56 { 57 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 58 struct wm831x *wm831x = dcdc->wm831x; 59 int mask = 1 << rdev_get_id(rdev); 60 int reg; 61 62 reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE); 63 if (reg < 0) 64 return reg; 65 66 if (reg & mask) 67 return 1; 68 else 69 return 0; 70 } 71 72 static int wm831x_dcdc_enable(struct regulator_dev *rdev) 73 { 74 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 75 struct wm831x *wm831x = dcdc->wm831x; 76 int mask = 1 << rdev_get_id(rdev); 77 78 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask); 79 } 80 81 static int wm831x_dcdc_disable(struct regulator_dev *rdev) 82 { 83 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 84 struct wm831x *wm831x = dcdc->wm831x; 85 int mask = 1 << rdev_get_id(rdev); 86 87 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0); 88 } 89 90 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev) 91 92 { 93 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 94 struct wm831x *wm831x = dcdc->wm831x; 95 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 96 int val; 97 98 val = wm831x_reg_read(wm831x, reg); 99 if (val < 0) 100 return val; 101 102 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT; 103 104 switch (val) { 105 case WM831X_DCDC_MODE_FAST: 106 return REGULATOR_MODE_FAST; 107 case WM831X_DCDC_MODE_NORMAL: 108 return REGULATOR_MODE_NORMAL; 109 case WM831X_DCDC_MODE_STANDBY: 110 return REGULATOR_MODE_STANDBY; 111 case WM831X_DCDC_MODE_IDLE: 112 return REGULATOR_MODE_IDLE; 113 default: 114 BUG(); 115 } 116 } 117 118 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg, 119 unsigned int mode) 120 { 121 int val; 122 123 switch (mode) { 124 case REGULATOR_MODE_FAST: 125 val = WM831X_DCDC_MODE_FAST; 126 break; 127 case REGULATOR_MODE_NORMAL: 128 val = WM831X_DCDC_MODE_NORMAL; 129 break; 130 case REGULATOR_MODE_STANDBY: 131 val = WM831X_DCDC_MODE_STANDBY; 132 break; 133 case REGULATOR_MODE_IDLE: 134 val = WM831X_DCDC_MODE_IDLE; 135 break; 136 default: 137 return -EINVAL; 138 } 139 140 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK, 141 val << WM831X_DC1_ON_MODE_SHIFT); 142 } 143 144 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 145 { 146 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 147 struct wm831x *wm831x = dcdc->wm831x; 148 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 149 150 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 151 } 152 153 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev, 154 unsigned int mode) 155 { 156 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 157 struct wm831x *wm831x = dcdc->wm831x; 158 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 159 160 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 161 } 162 163 static int wm831x_dcdc_get_status(struct regulator_dev *rdev) 164 { 165 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 166 struct wm831x *wm831x = dcdc->wm831x; 167 int ret; 168 169 /* First, check for errors */ 170 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 171 if (ret < 0) 172 return ret; 173 174 if (ret & (1 << rdev_get_id(rdev))) { 175 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 176 rdev_get_id(rdev) + 1); 177 return REGULATOR_STATUS_ERROR; 178 } 179 180 /* DCDC1 and DCDC2 can additionally detect high voltage/current */ 181 if (rdev_get_id(rdev) < 2) { 182 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) { 183 dev_dbg(wm831x->dev, "DCDC%d over voltage\n", 184 rdev_get_id(rdev) + 1); 185 return REGULATOR_STATUS_ERROR; 186 } 187 188 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) { 189 dev_dbg(wm831x->dev, "DCDC%d over current\n", 190 rdev_get_id(rdev) + 1); 191 return REGULATOR_STATUS_ERROR; 192 } 193 } 194 195 /* Is the regulator on? */ 196 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 197 if (ret < 0) 198 return ret; 199 if (!(ret & (1 << rdev_get_id(rdev)))) 200 return REGULATOR_STATUS_OFF; 201 202 /* TODO: When we handle hardware control modes so we can report the 203 * current mode. */ 204 return REGULATOR_STATUS_ON; 205 } 206 207 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data) 208 { 209 struct wm831x_dcdc *dcdc = data; 210 211 regulator_notifier_call_chain(dcdc->regulator, 212 REGULATOR_EVENT_UNDER_VOLTAGE, 213 NULL); 214 215 return IRQ_HANDLED; 216 } 217 218 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data) 219 { 220 struct wm831x_dcdc *dcdc = data; 221 222 regulator_notifier_call_chain(dcdc->regulator, 223 REGULATOR_EVENT_OVER_CURRENT, 224 NULL); 225 226 return IRQ_HANDLED; 227 } 228 229 /* 230 * BUCKV specifics 231 */ 232 233 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev, 234 unsigned selector) 235 { 236 if (selector <= 0x8) 237 return 600000; 238 if (selector <= WM831X_BUCKV_MAX_SELECTOR) 239 return 600000 + ((selector - 0x8) * 12500); 240 return -EINVAL; 241 } 242 243 static int wm831x_buckv_set_voltage_int(struct regulator_dev *rdev, int reg, 244 int min_uV, int max_uV) 245 { 246 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 247 struct wm831x *wm831x = dcdc->wm831x; 248 u16 vsel; 249 250 if (min_uV < 600000) 251 vsel = 0; 252 else if (min_uV <= 1800000) 253 vsel = ((min_uV - 600000) / 12500) + 8; 254 else 255 return -EINVAL; 256 257 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV) 258 return -EINVAL; 259 260 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_VSEL_MASK, vsel); 261 } 262 263 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev, 264 int min_uV, int max_uV) 265 { 266 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 267 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 268 269 return wm831x_buckv_set_voltage_int(rdev, reg, min_uV, max_uV); 270 } 271 272 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 273 int uV) 274 { 275 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 276 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 277 278 return wm831x_buckv_set_voltage_int(rdev, reg, uV, uV); 279 } 280 281 static int wm831x_buckv_get_voltage(struct regulator_dev *rdev) 282 { 283 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 284 struct wm831x *wm831x = dcdc->wm831x; 285 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 286 int val; 287 288 val = wm831x_reg_read(wm831x, reg); 289 if (val < 0) 290 return val; 291 292 return wm831x_buckv_list_voltage(rdev, val & WM831X_DC1_ON_VSEL_MASK); 293 } 294 295 /* Current limit options */ 296 static u16 wm831x_dcdc_ilim[] = { 297 125, 250, 375, 500, 625, 750, 875, 1000 298 }; 299 300 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, 301 int min_uA, int max_uA) 302 { 303 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 304 struct wm831x *wm831x = dcdc->wm831x; 305 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 306 int i; 307 308 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) { 309 if (max_uA <= wm831x_dcdc_ilim[i]) 310 break; 311 } 312 if (i == ARRAY_SIZE(wm831x_dcdc_ilim)) 313 return -EINVAL; 314 315 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i); 316 } 317 318 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 319 { 320 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 321 struct wm831x *wm831x = dcdc->wm831x; 322 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 323 int val; 324 325 val = wm831x_reg_read(wm831x, reg); 326 if (val < 0) 327 return val; 328 329 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK]; 330 } 331 332 static struct regulator_ops wm831x_buckv_ops = { 333 .set_voltage = wm831x_buckv_set_voltage, 334 .get_voltage = wm831x_buckv_get_voltage, 335 .list_voltage = wm831x_buckv_list_voltage, 336 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 337 .set_current_limit = wm831x_buckv_set_current_limit, 338 .get_current_limit = wm831x_buckv_get_current_limit, 339 340 .is_enabled = wm831x_dcdc_is_enabled, 341 .enable = wm831x_dcdc_enable, 342 .disable = wm831x_dcdc_disable, 343 .get_status = wm831x_dcdc_get_status, 344 .get_mode = wm831x_dcdc_get_mode, 345 .set_mode = wm831x_dcdc_set_mode, 346 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 347 }; 348 349 static __devinit int wm831x_buckv_probe(struct platform_device *pdev) 350 { 351 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 352 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 353 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 354 struct wm831x_dcdc *dcdc; 355 struct resource *res; 356 int ret, irq; 357 358 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 359 360 if (pdata == NULL || pdata->dcdc[id] == NULL) 361 return -ENODEV; 362 363 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 364 if (dcdc == NULL) { 365 dev_err(&pdev->dev, "Unable to allocate private data\n"); 366 return -ENOMEM; 367 } 368 369 dcdc->wm831x = wm831x; 370 371 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 372 if (res == NULL) { 373 dev_err(&pdev->dev, "No I/O resource\n"); 374 ret = -EINVAL; 375 goto err; 376 } 377 dcdc->base = res->start; 378 379 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 380 dcdc->desc.name = dcdc->name; 381 dcdc->desc.id = id; 382 dcdc->desc.type = REGULATOR_VOLTAGE; 383 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 384 dcdc->desc.ops = &wm831x_buckv_ops; 385 dcdc->desc.owner = THIS_MODULE; 386 387 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 388 pdata->dcdc[id], dcdc); 389 if (IS_ERR(dcdc->regulator)) { 390 ret = PTR_ERR(dcdc->regulator); 391 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 392 id + 1, ret); 393 goto err; 394 } 395 396 irq = platform_get_irq_byname(pdev, "UV"); 397 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 398 IRQF_TRIGGER_RISING, dcdc->name, 399 dcdc); 400 if (ret != 0) { 401 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 402 irq, ret); 403 goto err_regulator; 404 } 405 406 irq = platform_get_irq_byname(pdev, "HC"); 407 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq, 408 IRQF_TRIGGER_RISING, dcdc->name, 409 dcdc); 410 if (ret != 0) { 411 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 412 irq, ret); 413 goto err_uv; 414 } 415 416 platform_set_drvdata(pdev, dcdc); 417 418 return 0; 419 420 err_uv: 421 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 422 err_regulator: 423 regulator_unregister(dcdc->regulator); 424 err: 425 kfree(dcdc); 426 return ret; 427 } 428 429 static __devexit int wm831x_buckv_remove(struct platform_device *pdev) 430 { 431 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 432 struct wm831x *wm831x = dcdc->wm831x; 433 434 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc); 435 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 436 regulator_unregister(dcdc->regulator); 437 kfree(dcdc); 438 439 return 0; 440 } 441 442 static struct platform_driver wm831x_buckv_driver = { 443 .probe = wm831x_buckv_probe, 444 .remove = __devexit_p(wm831x_buckv_remove), 445 .driver = { 446 .name = "wm831x-buckv", 447 }, 448 }; 449 450 /* 451 * BUCKP specifics 452 */ 453 454 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev, 455 unsigned selector) 456 { 457 if (selector <= WM831X_BUCKP_MAX_SELECTOR) 458 return 850000 + (selector * 25000); 459 else 460 return -EINVAL; 461 } 462 463 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg, 464 int min_uV, int max_uV) 465 { 466 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 467 struct wm831x *wm831x = dcdc->wm831x; 468 u16 vsel; 469 470 if (min_uV <= 34000000) 471 vsel = (min_uV - 850000) / 25000; 472 else 473 return -EINVAL; 474 475 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV) 476 return -EINVAL; 477 478 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel); 479 } 480 481 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev, 482 int min_uV, int max_uV) 483 { 484 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 485 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 486 487 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV); 488 } 489 490 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, 491 int uV) 492 { 493 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 494 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 495 496 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV); 497 } 498 499 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev) 500 { 501 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 502 struct wm831x *wm831x = dcdc->wm831x; 503 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 504 int val; 505 506 val = wm831x_reg_read(wm831x, reg); 507 if (val < 0) 508 return val; 509 510 return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK); 511 } 512 513 static struct regulator_ops wm831x_buckp_ops = { 514 .set_voltage = wm831x_buckp_set_voltage, 515 .get_voltage = wm831x_buckp_get_voltage, 516 .list_voltage = wm831x_buckp_list_voltage, 517 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 518 519 .is_enabled = wm831x_dcdc_is_enabled, 520 .enable = wm831x_dcdc_enable, 521 .disable = wm831x_dcdc_disable, 522 .get_status = wm831x_dcdc_get_status, 523 .get_mode = wm831x_dcdc_get_mode, 524 .set_mode = wm831x_dcdc_set_mode, 525 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 526 }; 527 528 static __devinit int wm831x_buckp_probe(struct platform_device *pdev) 529 { 530 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 531 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 532 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 533 struct wm831x_dcdc *dcdc; 534 struct resource *res; 535 int ret, irq; 536 537 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 538 539 if (pdata == NULL || pdata->dcdc[id] == NULL) 540 return -ENODEV; 541 542 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 543 if (dcdc == NULL) { 544 dev_err(&pdev->dev, "Unable to allocate private data\n"); 545 return -ENOMEM; 546 } 547 548 dcdc->wm831x = wm831x; 549 550 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 551 if (res == NULL) { 552 dev_err(&pdev->dev, "No I/O resource\n"); 553 ret = -EINVAL; 554 goto err; 555 } 556 dcdc->base = res->start; 557 558 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 559 dcdc->desc.name = dcdc->name; 560 dcdc->desc.id = id; 561 dcdc->desc.type = REGULATOR_VOLTAGE; 562 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 563 dcdc->desc.ops = &wm831x_buckp_ops; 564 dcdc->desc.owner = THIS_MODULE; 565 566 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 567 pdata->dcdc[id], dcdc); 568 if (IS_ERR(dcdc->regulator)) { 569 ret = PTR_ERR(dcdc->regulator); 570 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 571 id + 1, ret); 572 goto err; 573 } 574 575 irq = platform_get_irq_byname(pdev, "UV"); 576 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 577 IRQF_TRIGGER_RISING, dcdc->name, 578 dcdc); 579 if (ret != 0) { 580 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 581 irq, ret); 582 goto err_regulator; 583 } 584 585 platform_set_drvdata(pdev, dcdc); 586 587 return 0; 588 589 err_regulator: 590 regulator_unregister(dcdc->regulator); 591 err: 592 kfree(dcdc); 593 return ret; 594 } 595 596 static __devexit int wm831x_buckp_remove(struct platform_device *pdev) 597 { 598 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 599 struct wm831x *wm831x = dcdc->wm831x; 600 601 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 602 regulator_unregister(dcdc->regulator); 603 kfree(dcdc); 604 605 return 0; 606 } 607 608 static struct platform_driver wm831x_buckp_driver = { 609 .probe = wm831x_buckp_probe, 610 .remove = __devexit_p(wm831x_buckp_remove), 611 .driver = { 612 .name = "wm831x-buckp", 613 }, 614 }; 615 616 static int __init wm831x_dcdc_init(void) 617 { 618 int ret; 619 ret = platform_driver_register(&wm831x_buckv_driver); 620 if (ret != 0) 621 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 622 623 ret = platform_driver_register(&wm831x_buckp_driver); 624 if (ret != 0) 625 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 626 627 return 0; 628 } 629 subsys_initcall(wm831x_dcdc_init); 630 631 static void __exit wm831x_dcdc_exit(void) 632 { 633 platform_driver_unregister(&wm831x_buckp_driver); 634 platform_driver_unregister(&wm831x_buckv_driver); 635 } 636 module_exit(wm831x_dcdc_exit); 637 638 /* Module information */ 639 MODULE_AUTHOR("Mark Brown"); 640 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 641 MODULE_LICENSE("GPL"); 642 MODULE_ALIAS("platform:wm831x-buckv"); 643 MODULE_ALIAS("platform:wm831x-buckp"); 644