/* * wm831x-ldo.c -- LDO driver for the WM831x series * * Copyright 2009 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/bitops.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/platform_device.h> #include <linux/regulator/driver.h> #include <linux/mfd/wm831x/core.h> #include <linux/mfd/wm831x/regulator.h> #include <linux/mfd/wm831x/pdata.h> #define WM831X_LDO_MAX_NAME 6 #define WM831X_LDO_CONTROL 0 #define WM831X_LDO_ON_CONTROL 1 #define WM831X_LDO_SLEEP_CONTROL 2 #define WM831X_ALIVE_LDO_ON_CONTROL 0 #define WM831X_ALIVE_LDO_SLEEP_CONTROL 1 struct wm831x_ldo { char name[WM831X_LDO_MAX_NAME]; struct regulator_desc desc; int base; struct wm831x *wm831x; struct regulator_dev *regulator; }; /* * Shared */ static int wm831x_ldo_is_enabled(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int mask = 1 << rdev_get_id(rdev); int reg; reg = wm831x_reg_read(wm831x, WM831X_LDO_ENABLE); if (reg < 0) return reg; if (reg & mask) return 1; else return 0; } static int wm831x_ldo_enable(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int mask = 1 << rdev_get_id(rdev); return wm831x_set_bits(wm831x, WM831X_LDO_ENABLE, mask, mask); } static int wm831x_ldo_disable(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int mask = 1 << rdev_get_id(rdev); return wm831x_set_bits(wm831x, WM831X_LDO_ENABLE, mask, 0); } static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data) { struct wm831x_ldo *ldo = data; regulator_notifier_call_chain(ldo->regulator, REGULATOR_EVENT_UNDER_VOLTAGE, NULL); return IRQ_HANDLED; } /* * General purpose LDOs */ #define WM831X_GP_LDO_SELECTOR_LOW 0xe #define WM831X_GP_LDO_MAX_SELECTOR 0x1f static int wm831x_gp_ldo_list_voltage(struct regulator_dev *rdev, unsigned int selector) { /* 0.9-1.6V in 50mV steps */ if (selector <= WM831X_GP_LDO_SELECTOR_LOW) return 900000 + (selector * 50000); /* 1.7-3.3V in 50mV steps */ if (selector <= WM831X_GP_LDO_MAX_SELECTOR) return 1600000 + ((selector - WM831X_GP_LDO_SELECTOR_LOW) * 100000); return -EINVAL; } static int wm831x_gp_ldo_set_voltage_int(struct regulator_dev *rdev, int reg, int min_uV, int max_uV) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int vsel, ret; if (min_uV < 900000) vsel = 0; else if (min_uV < 1700000) vsel = ((min_uV - 900000) / 50000); else vsel = ((min_uV - 1700000) / 100000) + WM831X_GP_LDO_SELECTOR_LOW + 1; ret = wm831x_gp_ldo_list_voltage(rdev, vsel); if (ret < 0) return ret; if (ret < min_uV || ret > max_uV) return -EINVAL; return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, vsel); } static int wm831x_gp_ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); int reg = ldo->base + WM831X_LDO_ON_CONTROL; return wm831x_gp_ldo_set_voltage_int(rdev, reg, min_uV, max_uV); } static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev, int uV) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL; return wm831x_gp_ldo_set_voltage_int(rdev, reg, uV, uV); } static int wm831x_gp_ldo_get_voltage(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int reg = ldo->base + WM831X_LDO_ON_CONTROL; int ret; ret = wm831x_reg_read(wm831x, reg); if (ret < 0) return ret; ret &= WM831X_LDO1_ON_VSEL_MASK; return wm831x_gp_ldo_list_voltage(rdev, ret); } static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int ctrl_reg = ldo->base + WM831X_LDO_CONTROL; int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; int ret; ret = wm831x_reg_read(wm831x, on_reg); if (ret < 0) return ret; if (!(ret & WM831X_LDO1_ON_MODE)) return REGULATOR_MODE_NORMAL; ret = wm831x_reg_read(wm831x, ctrl_reg); if (ret < 0) return ret; if (ret & WM831X_LDO1_LP_MODE) return REGULATOR_MODE_STANDBY; else return REGULATOR_MODE_IDLE; } static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int ctrl_reg = ldo->base + WM831X_LDO_CONTROL; int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; int ret; switch (mode) { case REGULATOR_MODE_NORMAL: ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO1_ON_MODE, 0); if (ret < 0) return ret; break; case REGULATOR_MODE_IDLE: ret = wm831x_set_bits(wm831x, ctrl_reg, WM831X_LDO1_LP_MODE, WM831X_LDO1_LP_MODE); if (ret < 0) return ret; ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO1_ON_MODE, WM831X_LDO1_ON_MODE); if (ret < 0) return ret; case REGULATOR_MODE_STANDBY: ret = wm831x_set_bits(wm831x, ctrl_reg, WM831X_LDO1_LP_MODE, 0); if (ret < 0) return ret; ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO1_ON_MODE, WM831X_LDO1_ON_MODE); if (ret < 0) return ret; break; default: return -EINVAL; } return 0; } static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int mask = 1 << rdev_get_id(rdev); int ret; /* Is the regulator on? */ ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS); if (ret < 0) return ret; if (!(ret & mask)) return REGULATOR_STATUS_OFF; /* Is it reporting under voltage? */ ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS); if (ret & mask) return REGULATOR_STATUS_ERROR; ret = wm831x_gp_ldo_get_mode(rdev); if (ret < 0) return ret; else return regulator_mode_to_status(ret); } static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev, int input_uV, int output_uV, int load_uA) { if (load_uA < 20000) return REGULATOR_MODE_STANDBY; if (load_uA < 50000) return REGULATOR_MODE_IDLE; return REGULATOR_MODE_NORMAL; } static struct regulator_ops wm831x_gp_ldo_ops = { .list_voltage = wm831x_gp_ldo_list_voltage, .get_voltage = wm831x_gp_ldo_get_voltage, .set_voltage = wm831x_gp_ldo_set_voltage, .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage, .get_mode = wm831x_gp_ldo_get_mode, .set_mode = wm831x_gp_ldo_set_mode, .get_status = wm831x_gp_ldo_get_status, .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode, .is_enabled = wm831x_ldo_is_enabled, .enable = wm831x_ldo_enable, .disable = wm831x_ldo_disable, }; static __devinit int wm831x_gp_ldo_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct wm831x_pdata *pdata = wm831x->dev->platform_data; int id = pdev->id % ARRAY_SIZE(pdata->ldo); struct wm831x_ldo *ldo; struct resource *res; int ret, irq; dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); if (pdata == NULL || pdata->ldo[id] == NULL) return -ENODEV; ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL); if (ldo == NULL) { dev_err(&pdev->dev, "Unable to allocate private data\n"); return -ENOMEM; } ldo->wm831x = wm831x; res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (res == NULL) { dev_err(&pdev->dev, "No I/O resource\n"); ret = -EINVAL; goto err; } ldo->base = res->start; snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); ldo->desc.name = ldo->name; ldo->desc.id = id; ldo->desc.type = REGULATOR_VOLTAGE; ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1; ldo->desc.ops = &wm831x_gp_ldo_ops; ldo->desc.owner = THIS_MODULE; ldo->regulator = regulator_register(&ldo->desc, &pdev->dev, pdata->ldo[id], ldo); if (IS_ERR(ldo->regulator)) { ret = PTR_ERR(ldo->regulator); dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", id + 1, ret); goto err; } irq = platform_get_irq_byname(pdev, "UV"); ret = wm831x_request_irq(wm831x, irq, wm831x_ldo_uv_irq, IRQF_TRIGGER_RISING, ldo->name, ldo); if (ret != 0) { dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", irq, ret); goto err_regulator; } platform_set_drvdata(pdev, ldo); return 0; err_regulator: regulator_unregister(ldo->regulator); err: kfree(ldo); return ret; } static __devexit int wm831x_gp_ldo_remove(struct platform_device *pdev) { struct wm831x_ldo *ldo = platform_get_drvdata(pdev); struct wm831x *wm831x = ldo->wm831x; wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), ldo); regulator_unregister(ldo->regulator); kfree(ldo); return 0; } static struct platform_driver wm831x_gp_ldo_driver = { .probe = wm831x_gp_ldo_probe, .remove = __devexit_p(wm831x_gp_ldo_remove), .driver = { .name = "wm831x-ldo", }, }; /* * Analogue LDOs */ #define WM831X_ALDO_SELECTOR_LOW 0xc #define WM831X_ALDO_MAX_SELECTOR 0x1f static int wm831x_aldo_list_voltage(struct regulator_dev *rdev, unsigned int selector) { /* 1-1.6V in 50mV steps */ if (selector <= WM831X_ALDO_SELECTOR_LOW) return 1000000 + (selector * 50000); /* 1.7-3.5V in 50mV steps */ if (selector <= WM831X_ALDO_MAX_SELECTOR) return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW) * 100000); return -EINVAL; } static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg, int min_uV, int max_uV) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int vsel, ret; if (min_uV < 1000000) vsel = 0; else if (min_uV < 1700000) vsel = ((min_uV - 1000000) / 50000); else vsel = ((min_uV - 1700000) / 100000) + WM831X_ALDO_SELECTOR_LOW + 1; ret = wm831x_aldo_list_voltage(rdev, vsel); if (ret < 0) return ret; if (ret < min_uV || ret > max_uV) return -EINVAL; return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel); } static int wm831x_aldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); int reg = ldo->base + WM831X_LDO_ON_CONTROL; return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV); } static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev, int uV) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL; return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV); } static int wm831x_aldo_get_voltage(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int reg = ldo->base + WM831X_LDO_ON_CONTROL; int ret; ret = wm831x_reg_read(wm831x, reg); if (ret < 0) return ret; ret &= WM831X_LDO7_ON_VSEL_MASK; return wm831x_aldo_list_voltage(rdev, ret); } static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; int ret; ret = wm831x_reg_read(wm831x, on_reg); if (ret < 0) return 0; if (ret & WM831X_LDO7_ON_MODE) return REGULATOR_MODE_IDLE; else return REGULATOR_MODE_NORMAL; } static int wm831x_aldo_set_mode(struct regulator_dev *rdev, unsigned int mode) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int ctrl_reg = ldo->base + WM831X_LDO_CONTROL; int on_reg = ldo->base + WM831X_LDO_ON_CONTROL; int ret; switch (mode) { case REGULATOR_MODE_NORMAL: ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0); if (ret < 0) return ret; break; case REGULATOR_MODE_IDLE: ret = wm831x_set_bits(wm831x, ctrl_reg, WM831X_LDO7_ON_MODE, WM831X_LDO7_ON_MODE); if (ret < 0) return ret; break; default: return -EINVAL; } return 0; } static int wm831x_aldo_get_status(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int mask = 1 << rdev_get_id(rdev); int ret; /* Is the regulator on? */ ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS); if (ret < 0) return ret; if (!(ret & mask)) return REGULATOR_STATUS_OFF; /* Is it reporting under voltage? */ ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS); if (ret & mask) return REGULATOR_STATUS_ERROR; ret = wm831x_aldo_get_mode(rdev); if (ret < 0) return ret; else return regulator_mode_to_status(ret); } static struct regulator_ops wm831x_aldo_ops = { .list_voltage = wm831x_aldo_list_voltage, .get_voltage = wm831x_aldo_get_voltage, .set_voltage = wm831x_aldo_set_voltage, .set_suspend_voltage = wm831x_aldo_set_suspend_voltage, .get_mode = wm831x_aldo_get_mode, .set_mode = wm831x_aldo_set_mode, .get_status = wm831x_aldo_get_status, .is_enabled = wm831x_ldo_is_enabled, .enable = wm831x_ldo_enable, .disable = wm831x_ldo_disable, }; static __devinit int wm831x_aldo_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct wm831x_pdata *pdata = wm831x->dev->platform_data; int id = pdev->id % ARRAY_SIZE(pdata->ldo); struct wm831x_ldo *ldo; struct resource *res; int ret, irq; dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); if (pdata == NULL || pdata->ldo[id] == NULL) return -ENODEV; ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL); if (ldo == NULL) { dev_err(&pdev->dev, "Unable to allocate private data\n"); return -ENOMEM; } ldo->wm831x = wm831x; res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (res == NULL) { dev_err(&pdev->dev, "No I/O resource\n"); ret = -EINVAL; goto err; } ldo->base = res->start; snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); ldo->desc.name = ldo->name; ldo->desc.id = id; ldo->desc.type = REGULATOR_VOLTAGE; ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1; ldo->desc.ops = &wm831x_aldo_ops; ldo->desc.owner = THIS_MODULE; ldo->regulator = regulator_register(&ldo->desc, &pdev->dev, pdata->ldo[id], ldo); if (IS_ERR(ldo->regulator)) { ret = PTR_ERR(ldo->regulator); dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", id + 1, ret); goto err; } irq = platform_get_irq_byname(pdev, "UV"); ret = wm831x_request_irq(wm831x, irq, wm831x_ldo_uv_irq, IRQF_TRIGGER_RISING, ldo->name, ldo); if (ret != 0) { dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", irq, ret); goto err_regulator; } platform_set_drvdata(pdev, ldo); return 0; err_regulator: regulator_unregister(ldo->regulator); err: kfree(ldo); return ret; } static __devexit int wm831x_aldo_remove(struct platform_device *pdev) { struct wm831x_ldo *ldo = platform_get_drvdata(pdev); struct wm831x *wm831x = ldo->wm831x; wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), ldo); regulator_unregister(ldo->regulator); kfree(ldo); return 0; } static struct platform_driver wm831x_aldo_driver = { .probe = wm831x_aldo_probe, .remove = __devexit_p(wm831x_aldo_remove), .driver = { .name = "wm831x-aldo", }, }; /* * Alive LDO */ #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf static int wm831x_alive_ldo_list_voltage(struct regulator_dev *rdev, unsigned int selector) { /* 0.8-1.55V in 50mV steps */ if (selector <= WM831X_ALIVE_LDO_MAX_SELECTOR) return 800000 + (selector * 50000); return -EINVAL; } static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev, int reg, int min_uV, int max_uV) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int vsel, ret; vsel = (min_uV - 800000) / 50000; ret = wm831x_alive_ldo_list_voltage(rdev, vsel); if (ret < 0) return ret; if (ret < min_uV || ret > max_uV) return -EINVAL; return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel); } static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL; return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV); } static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev, int uV) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL; return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV); } static int wm831x_alive_ldo_get_voltage(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL; int ret; ret = wm831x_reg_read(wm831x, reg); if (ret < 0) return ret; ret &= WM831X_LDO11_ON_VSEL_MASK; return wm831x_alive_ldo_list_voltage(rdev, ret); } static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev) { struct wm831x_ldo *ldo = rdev_get_drvdata(rdev); struct wm831x *wm831x = ldo->wm831x; int mask = 1 << rdev_get_id(rdev); int ret; /* Is the regulator on? */ ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS); if (ret < 0) return ret; if (ret & mask) return REGULATOR_STATUS_ON; else return REGULATOR_STATUS_OFF; } static struct regulator_ops wm831x_alive_ldo_ops = { .list_voltage = wm831x_alive_ldo_list_voltage, .get_voltage = wm831x_alive_ldo_get_voltage, .set_voltage = wm831x_alive_ldo_set_voltage, .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage, .get_status = wm831x_alive_ldo_get_status, .is_enabled = wm831x_ldo_is_enabled, .enable = wm831x_ldo_enable, .disable = wm831x_ldo_disable, }; static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct wm831x_pdata *pdata = wm831x->dev->platform_data; int id = pdev->id % ARRAY_SIZE(pdata->ldo); struct wm831x_ldo *ldo; struct resource *res; int ret; dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); if (pdata == NULL || pdata->ldo[id] == NULL) return -ENODEV; ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL); if (ldo == NULL) { dev_err(&pdev->dev, "Unable to allocate private data\n"); return -ENOMEM; } ldo->wm831x = wm831x; res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (res == NULL) { dev_err(&pdev->dev, "No I/O resource\n"); ret = -EINVAL; goto err; } ldo->base = res->start; snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1); ldo->desc.name = ldo->name; ldo->desc.id = id; ldo->desc.type = REGULATOR_VOLTAGE; ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1; ldo->desc.ops = &wm831x_alive_ldo_ops; ldo->desc.owner = THIS_MODULE; ldo->regulator = regulator_register(&ldo->desc, &pdev->dev, pdata->ldo[id], ldo); if (IS_ERR(ldo->regulator)) { ret = PTR_ERR(ldo->regulator); dev_err(wm831x->dev, "Failed to register LDO%d: %d\n", id + 1, ret); goto err; } platform_set_drvdata(pdev, ldo); return 0; err: kfree(ldo); return ret; } static __devexit int wm831x_alive_ldo_remove(struct platform_device *pdev) { struct wm831x_ldo *ldo = platform_get_drvdata(pdev); regulator_unregister(ldo->regulator); kfree(ldo); return 0; } static struct platform_driver wm831x_alive_ldo_driver = { .probe = wm831x_alive_ldo_probe, .remove = __devexit_p(wm831x_alive_ldo_remove), .driver = { .name = "wm831x-alive-ldo", }, }; static int __init wm831x_ldo_init(void) { int ret; ret = platform_driver_register(&wm831x_gp_ldo_driver); if (ret != 0) pr_err("Failed to register WM831x GP LDO driver: %d\n", ret); ret = platform_driver_register(&wm831x_aldo_driver); if (ret != 0) pr_err("Failed to register WM831x ALDO driver: %d\n", ret); ret = platform_driver_register(&wm831x_alive_ldo_driver); if (ret != 0) pr_err("Failed to register WM831x alive LDO driver: %d\n", ret); return 0; } subsys_initcall(wm831x_ldo_init); static void __exit wm831x_ldo_exit(void) { platform_driver_unregister(&wm831x_alive_ldo_driver); platform_driver_unregister(&wm831x_aldo_driver); platform_driver_unregister(&wm831x_gp_ldo_driver); } module_exit(wm831x_ldo_exit); /* Module information */ MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); MODULE_DESCRIPTION("WM831x LDO driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm831x-ldo"); MODULE_ALIAS("platform:wm831x-aldo"); MODULE_ALIAS("platform:wm831x-aliveldo");