2 * wm831x-ldo.c -- LDO driver for the WM831x series
4 * Copyright 2009 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
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>
24 #include <linux/mfd/wm831x/core.h>
25 #include <linux/mfd/wm831x/regulator.h>
26 #include <linux/mfd/wm831x/pdata.h>
28 #define WM831X_LDO_MAX_NAME 9
30 #define WM831X_LDO_CONTROL 0
31 #define WM831X_LDO_ON_CONTROL 1
32 #define WM831X_LDO_SLEEP_CONTROL 2
34 #define WM831X_ALIVE_LDO_ON_CONTROL 0
35 #define WM831X_ALIVE_LDO_SLEEP_CONTROL 1
38 char name[WM831X_LDO_MAX_NAME];
39 char supply_name[WM831X_LDO_MAX_NAME];
40 struct regulator_desc desc;
42 struct wm831x *wm831x;
43 struct regulator_dev *regulator;
50 static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
52 struct wm831x_ldo *ldo = data;
54 regulator_notifier_call_chain(ldo->regulator,
55 REGULATOR_EVENT_UNDER_VOLTAGE,
62 * General purpose LDOs
65 #define WM831X_GP_LDO_SELECTOR_LOW 0xe
66 #define WM831X_GP_LDO_MAX_SELECTOR 0x1f
68 static int wm831x_gp_ldo_list_voltage(struct regulator_dev *rdev,
69 unsigned int selector)
71 /* 0.9-1.6V in 50mV steps */
72 if (selector <= WM831X_GP_LDO_SELECTOR_LOW)
73 return 900000 + (selector * 50000);
74 /* 1.7-3.3V in 100mV steps */
75 if (selector <= WM831X_GP_LDO_MAX_SELECTOR)
76 return 1600000 + ((selector - WM831X_GP_LDO_SELECTOR_LOW)
81 static int wm831x_gp_ldo_set_voltage_int(struct regulator_dev *rdev, int reg,
82 int min_uV, int max_uV,
85 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
86 struct wm831x *wm831x = ldo->wm831x;
91 else if (min_uV < 1700000)
92 vsel = ((min_uV - 900000) / 50000);
94 vsel = ((min_uV - 1700000) / 100000)
95 + WM831X_GP_LDO_SELECTOR_LOW + 1;
97 ret = wm831x_gp_ldo_list_voltage(rdev, vsel);
100 if (ret < min_uV || ret > max_uV)
105 return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, vsel);
108 static int wm831x_gp_ldo_set_voltage(struct regulator_dev *rdev,
109 int min_uV, int max_uV,
112 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
113 int reg = ldo->base + WM831X_LDO_ON_CONTROL;
115 return wm831x_gp_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
119 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
122 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
123 int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
124 unsigned int selector;
126 return wm831x_gp_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
129 static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
131 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
132 struct wm831x *wm831x = ldo->wm831x;
133 int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
134 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
137 ret = wm831x_reg_read(wm831x, on_reg);
141 if (!(ret & WM831X_LDO1_ON_MODE))
142 return REGULATOR_MODE_NORMAL;
144 ret = wm831x_reg_read(wm831x, ctrl_reg);
148 if (ret & WM831X_LDO1_LP_MODE)
149 return REGULATOR_MODE_STANDBY;
151 return REGULATOR_MODE_IDLE;
154 static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
157 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
158 struct wm831x *wm831x = ldo->wm831x;
159 int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
160 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
165 case REGULATOR_MODE_NORMAL:
166 ret = wm831x_set_bits(wm831x, on_reg,
167 WM831X_LDO1_ON_MODE, 0);
172 case REGULATOR_MODE_IDLE:
173 ret = wm831x_set_bits(wm831x, ctrl_reg,
174 WM831X_LDO1_LP_MODE, 0);
178 ret = wm831x_set_bits(wm831x, on_reg,
180 WM831X_LDO1_ON_MODE);
185 case REGULATOR_MODE_STANDBY:
186 ret = wm831x_set_bits(wm831x, ctrl_reg,
188 WM831X_LDO1_LP_MODE);
192 ret = wm831x_set_bits(wm831x, on_reg,
194 WM831X_LDO1_ON_MODE);
206 static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
208 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
209 struct wm831x *wm831x = ldo->wm831x;
210 int mask = 1 << rdev_get_id(rdev);
213 /* Is the regulator on? */
214 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
218 return REGULATOR_STATUS_OFF;
220 /* Is it reporting under voltage? */
221 ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
223 return REGULATOR_STATUS_ERROR;
225 ret = wm831x_gp_ldo_get_mode(rdev);
229 return regulator_mode_to_status(ret);
232 static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
234 int output_uV, int load_uA)
237 return REGULATOR_MODE_STANDBY;
239 return REGULATOR_MODE_IDLE;
240 return REGULATOR_MODE_NORMAL;
244 static struct regulator_ops wm831x_gp_ldo_ops = {
245 .list_voltage = wm831x_gp_ldo_list_voltage,
246 .get_voltage_sel = regulator_get_voltage_sel_regmap,
247 .set_voltage = wm831x_gp_ldo_set_voltage,
248 .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
249 .get_mode = wm831x_gp_ldo_get_mode,
250 .set_mode = wm831x_gp_ldo_set_mode,
251 .get_status = wm831x_gp_ldo_get_status,
252 .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
254 .is_enabled = regulator_is_enabled_regmap,
255 .enable = regulator_enable_regmap,
256 .disable = regulator_disable_regmap,
259 static __devinit int wm831x_gp_ldo_probe(struct platform_device *pdev)
261 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
262 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
263 struct regulator_config config = { };
265 struct wm831x_ldo *ldo;
266 struct resource *res;
269 if (pdata && pdata->wm831x_num)
270 id = (pdata->wm831x_num * 10) + 1;
275 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
277 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
279 dev_err(&pdev->dev, "Unable to allocate private data\n");
283 ldo->wm831x = wm831x;
285 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
287 dev_err(&pdev->dev, "No I/O resource\n");
291 ldo->base = res->start;
293 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
294 ldo->desc.name = ldo->name;
296 snprintf(ldo->supply_name, sizeof(ldo->supply_name),
298 ldo->desc.supply_name = ldo->supply_name;
301 ldo->desc.type = REGULATOR_VOLTAGE;
302 ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1;
303 ldo->desc.ops = &wm831x_gp_ldo_ops;
304 ldo->desc.owner = THIS_MODULE;
305 ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
306 ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
307 ldo->desc.enable_reg = WM831X_LDO_ENABLE;
308 ldo->desc.enable_mask = 1 << id;
310 config.dev = pdev->dev.parent;
312 config.init_data = pdata->ldo[id];
313 config.driver_data = ldo;
314 config.regmap = wm831x->regmap;
316 ldo->regulator = regulator_register(&ldo->desc, &config);
317 if (IS_ERR(ldo->regulator)) {
318 ret = PTR_ERR(ldo->regulator);
319 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
324 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
325 ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
326 IRQF_TRIGGER_RISING, ldo->name,
329 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
334 platform_set_drvdata(pdev, ldo);
339 regulator_unregister(ldo->regulator);
344 static __devexit int wm831x_gp_ldo_remove(struct platform_device *pdev)
346 struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
348 platform_set_drvdata(pdev, NULL);
350 free_irq(wm831x_irq(ldo->wm831x,
351 platform_get_irq_byname(pdev, "UV")), ldo);
352 regulator_unregister(ldo->regulator);
357 static struct platform_driver wm831x_gp_ldo_driver = {
358 .probe = wm831x_gp_ldo_probe,
359 .remove = __devexit_p(wm831x_gp_ldo_remove),
361 .name = "wm831x-ldo",
362 .owner = THIS_MODULE,
371 #define WM831X_ALDO_SELECTOR_LOW 0xc
372 #define WM831X_ALDO_MAX_SELECTOR 0x1f
374 static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
375 unsigned int selector)
377 /* 1-1.6V in 50mV steps */
378 if (selector <= WM831X_ALDO_SELECTOR_LOW)
379 return 1000000 + (selector * 50000);
380 /* 1.7-3.5V in 100mV steps */
381 if (selector <= WM831X_ALDO_MAX_SELECTOR)
382 return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
387 static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,
388 int min_uV, int max_uV,
391 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
392 struct wm831x *wm831x = ldo->wm831x;
395 if (min_uV < 1000000)
397 else if (min_uV < 1700000)
398 vsel = ((min_uV - 1000000) / 50000);
400 vsel = ((min_uV - 1700000) / 100000)
401 + WM831X_ALDO_SELECTOR_LOW + 1;
403 ret = wm831x_aldo_list_voltage(rdev, vsel);
406 if (ret < min_uV || ret > max_uV)
411 return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel);
414 static int wm831x_aldo_set_voltage(struct regulator_dev *rdev,
415 int min_uV, int max_uV, unsigned *selector)
417 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
418 int reg = ldo->base + WM831X_LDO_ON_CONTROL;
420 return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV,
424 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
427 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
428 int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
429 unsigned int selector;
431 return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV, &selector);
434 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
436 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
437 struct wm831x *wm831x = ldo->wm831x;
438 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
441 ret = wm831x_reg_read(wm831x, on_reg);
445 if (ret & WM831X_LDO7_ON_MODE)
446 return REGULATOR_MODE_IDLE;
448 return REGULATOR_MODE_NORMAL;
451 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
454 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
455 struct wm831x *wm831x = ldo->wm831x;
456 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
461 case REGULATOR_MODE_NORMAL:
462 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
467 case REGULATOR_MODE_IDLE:
468 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
469 WM831X_LDO7_ON_MODE);
481 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
483 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
484 struct wm831x *wm831x = ldo->wm831x;
485 int mask = 1 << rdev_get_id(rdev);
488 /* Is the regulator on? */
489 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
493 return REGULATOR_STATUS_OFF;
495 /* Is it reporting under voltage? */
496 ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
498 return REGULATOR_STATUS_ERROR;
500 ret = wm831x_aldo_get_mode(rdev);
504 return regulator_mode_to_status(ret);
507 static struct regulator_ops wm831x_aldo_ops = {
508 .list_voltage = wm831x_aldo_list_voltage,
509 .get_voltage_sel = regulator_get_voltage_sel_regmap,
510 .set_voltage = wm831x_aldo_set_voltage,
511 .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
512 .get_mode = wm831x_aldo_get_mode,
513 .set_mode = wm831x_aldo_set_mode,
514 .get_status = wm831x_aldo_get_status,
516 .is_enabled = regulator_is_enabled_regmap,
517 .enable = regulator_enable_regmap,
518 .disable = regulator_disable_regmap,
521 static __devinit int wm831x_aldo_probe(struct platform_device *pdev)
523 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
524 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
525 struct regulator_config config = { };
527 struct wm831x_ldo *ldo;
528 struct resource *res;
531 if (pdata && pdata->wm831x_num)
532 id = (pdata->wm831x_num * 10) + 1;
537 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
539 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
541 dev_err(&pdev->dev, "Unable to allocate private data\n");
545 ldo->wm831x = wm831x;
547 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
549 dev_err(&pdev->dev, "No I/O resource\n");
553 ldo->base = res->start;
555 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
556 ldo->desc.name = ldo->name;
558 snprintf(ldo->supply_name, sizeof(ldo->supply_name),
560 ldo->desc.supply_name = ldo->supply_name;
563 ldo->desc.type = REGULATOR_VOLTAGE;
564 ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
565 ldo->desc.ops = &wm831x_aldo_ops;
566 ldo->desc.owner = THIS_MODULE;
567 ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
568 ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
569 ldo->desc.enable_reg = WM831X_LDO_ENABLE;
570 ldo->desc.enable_mask = 1 << id;
572 config.dev = pdev->dev.parent;
574 config.init_data = pdata->ldo[id];
575 config.driver_data = ldo;
576 config.regmap = wm831x->regmap;
578 ldo->regulator = regulator_register(&ldo->desc, &config);
579 if (IS_ERR(ldo->regulator)) {
580 ret = PTR_ERR(ldo->regulator);
581 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
586 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
587 ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
588 IRQF_TRIGGER_RISING, ldo->name, ldo);
590 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
595 platform_set_drvdata(pdev, ldo);
600 regulator_unregister(ldo->regulator);
605 static __devexit int wm831x_aldo_remove(struct platform_device *pdev)
607 struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
609 free_irq(wm831x_irq(ldo->wm831x, platform_get_irq_byname(pdev, "UV")),
611 regulator_unregister(ldo->regulator);
616 static struct platform_driver wm831x_aldo_driver = {
617 .probe = wm831x_aldo_probe,
618 .remove = __devexit_p(wm831x_aldo_remove),
620 .name = "wm831x-aldo",
621 .owner = THIS_MODULE,
629 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
631 static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
633 int min_uV, int max_uV,
636 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
637 struct wm831x *wm831x = ldo->wm831x;
640 vsel = (min_uV - 800000) / 50000;
642 ret = regulator_list_voltage_linear(rdev, vsel);
645 if (ret < min_uV || ret > max_uV)
650 return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel);
653 static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev,
654 int min_uV, int max_uV,
657 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
658 int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
660 return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
664 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
667 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
668 int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
671 return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
674 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
676 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
677 struct wm831x *wm831x = ldo->wm831x;
678 int mask = 1 << rdev_get_id(rdev);
681 /* Is the regulator on? */
682 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
686 return REGULATOR_STATUS_ON;
688 return REGULATOR_STATUS_OFF;
691 static struct regulator_ops wm831x_alive_ldo_ops = {
692 .list_voltage = regulator_list_voltage_linear,
693 .get_voltage_sel = regulator_get_voltage_sel_regmap,
694 .set_voltage = wm831x_alive_ldo_set_voltage,
695 .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
696 .get_status = wm831x_alive_ldo_get_status,
698 .is_enabled = regulator_is_enabled_regmap,
699 .enable = regulator_enable_regmap,
700 .disable = regulator_disable_regmap,
703 static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev)
705 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
706 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
707 struct regulator_config config = { };
709 struct wm831x_ldo *ldo;
710 struct resource *res;
713 if (pdata && pdata->wm831x_num)
714 id = (pdata->wm831x_num * 10) + 1;
720 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
722 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
724 dev_err(&pdev->dev, "Unable to allocate private data\n");
728 ldo->wm831x = wm831x;
730 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
732 dev_err(&pdev->dev, "No I/O resource\n");
736 ldo->base = res->start;
738 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
739 ldo->desc.name = ldo->name;
741 snprintf(ldo->supply_name, sizeof(ldo->supply_name),
743 ldo->desc.supply_name = ldo->supply_name;
746 ldo->desc.type = REGULATOR_VOLTAGE;
747 ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
748 ldo->desc.ops = &wm831x_alive_ldo_ops;
749 ldo->desc.owner = THIS_MODULE;
750 ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
751 ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
752 ldo->desc.enable_reg = WM831X_LDO_ENABLE;
753 ldo->desc.enable_mask = 1 << id;
754 ldo->desc.min_uV = 800000;
755 ldo->desc.uV_step = 50000;
757 config.dev = pdev->dev.parent;
759 config.init_data = pdata->ldo[id];
760 config.driver_data = ldo;
761 config.regmap = wm831x->regmap;
763 ldo->regulator = regulator_register(&ldo->desc, &config);
764 if (IS_ERR(ldo->regulator)) {
765 ret = PTR_ERR(ldo->regulator);
766 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
771 platform_set_drvdata(pdev, ldo);
779 static __devexit int wm831x_alive_ldo_remove(struct platform_device *pdev)
781 struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
783 regulator_unregister(ldo->regulator);
788 static struct platform_driver wm831x_alive_ldo_driver = {
789 .probe = wm831x_alive_ldo_probe,
790 .remove = __devexit_p(wm831x_alive_ldo_remove),
792 .name = "wm831x-alive-ldo",
793 .owner = THIS_MODULE,
797 static int __init wm831x_ldo_init(void)
801 ret = platform_driver_register(&wm831x_gp_ldo_driver);
803 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);
805 ret = platform_driver_register(&wm831x_aldo_driver);
807 pr_err("Failed to register WM831x ALDO driver: %d\n", ret);
809 ret = platform_driver_register(&wm831x_alive_ldo_driver);
811 pr_err("Failed to register WM831x alive LDO driver: %d\n",
816 subsys_initcall(wm831x_ldo_init);
818 static void __exit wm831x_ldo_exit(void)
820 platform_driver_unregister(&wm831x_alive_ldo_driver);
821 platform_driver_unregister(&wm831x_aldo_driver);
822 platform_driver_unregister(&wm831x_gp_ldo_driver);
824 module_exit(wm831x_ldo_exit);
826 /* Module information */
827 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
828 MODULE_DESCRIPTION("WM831x LDO driver");
829 MODULE_LICENSE("GPL");
830 MODULE_ALIAS("platform:wm831x-ldo");
831 MODULE_ALIAS("platform:wm831x-aldo");
832 MODULE_ALIAS("platform:wm831x-aliveldo");