/* * Regulator support for WM8400 * * Copyright 2008 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/bug.h> #include <linux/err.h> #include <linux/kernel.h> #include <linux/regulator/driver.h> #include <linux/mfd/wm8400-private.h> static int wm8400_ldo_is_enabled(struct regulator_dev *dev) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); u16 val; val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); return (val & WM8400_LDO1_ENA) != 0; } static int wm8400_ldo_enable(struct regulator_dev *dev) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), WM8400_LDO1_ENA, WM8400_LDO1_ENA); } static int wm8400_ldo_disable(struct regulator_dev *dev) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), WM8400_LDO1_ENA, 0); } static int wm8400_ldo_get_voltage(struct regulator_dev *dev) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); u16 val; val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); val &= WM8400_LDO1_VSEL_MASK; if (val < 15) return 900000 + (val * 50000); else return 1600000 + ((val - 14) * 100000); } static int wm8400_ldo_set_voltage(struct regulator_dev *dev, int min_uV, int max_uV) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); u16 val; if (min_uV < 900000 || min_uV > 3300000) return -EINVAL; if (min_uV < 1700000) { /* Steps of 50mV from 900mV; */ val = (min_uV - 850001) / 50000; if ((val * 50000) + 900000 > max_uV) return -EINVAL; BUG_ON((val * 50000) + 900000 < min_uV); } else { /* Steps of 100mV from 1700mV */ val = ((min_uV - 1600001) / 100000); if ((val * 100000) + 1700000 > max_uV) return -EINVAL; BUG_ON((val * 100000) + 1700000 < min_uV); val += 0xf; } return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), WM8400_LDO1_VSEL_MASK, val); } static struct regulator_ops wm8400_ldo_ops = { .is_enabled = wm8400_ldo_is_enabled, .enable = wm8400_ldo_enable, .disable = wm8400_ldo_disable, .get_voltage = wm8400_ldo_get_voltage, .set_voltage = wm8400_ldo_set_voltage, }; static int wm8400_dcdc_is_enabled(struct regulator_dev *dev) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; u16 val; val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); return (val & WM8400_DC1_ENA) != 0; } static int wm8400_dcdc_enable(struct regulator_dev *dev) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, WM8400_DC1_ENA, WM8400_DC1_ENA); } static int wm8400_dcdc_disable(struct regulator_dev *dev) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, WM8400_DC1_ENA, 0); } static int wm8400_dcdc_get_voltage(struct regulator_dev *dev) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); u16 val; int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); val &= WM8400_DC1_VSEL_MASK; return 850000 + (25000 * val); } static int wm8400_dcdc_set_voltage(struct regulator_dev *dev, int min_uV, int max_uV) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); u16 val; int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; if (min_uV < 850000) return -EINVAL; val = (min_uV - 825001) / 25000; if (850000 + (25000 * val) > max_uV) return -EINVAL; BUG_ON(850000 + (25000 * val) < min_uV); return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, WM8400_DC1_VSEL_MASK, val); } static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; u16 data[2]; int ret; ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, data); if (ret != 0) return 0; /* Datasheet: hibernate */ if (data[0] & WM8400_DC1_SLEEP) return REGULATOR_MODE_STANDBY; /* Datasheet: standby */ if (!(data[0] & WM8400_DC1_ACTIVE)) return REGULATOR_MODE_IDLE; /* Datasheet: active with or without force PWM */ if (data[1] & WM8400_DC1_FRC_PWM) return REGULATOR_MODE_FAST; else return REGULATOR_MODE_NORMAL; } static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) { struct wm8400 *wm8400 = rdev_get_drvdata(dev); int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; int ret; switch (mode) { case REGULATOR_MODE_FAST: /* Datasheet: active with force PWM */ ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); if (ret != 0) return ret; return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, WM8400_DC1_ACTIVE); case REGULATOR_MODE_NORMAL: /* Datasheet: active */ ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, WM8400_DC1_FRC_PWM, 0); if (ret != 0) return ret; return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, WM8400_DC1_ACTIVE); case REGULATOR_MODE_IDLE: /* Datasheet: standby */ ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, WM8400_DC1_ACTIVE, 0); if (ret != 0) return ret; return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, WM8400_DC1_SLEEP, 0); default: return -EINVAL; } } static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, int input_uV, int output_uV, int load_uA) { return REGULATOR_MODE_NORMAL; } static struct regulator_ops wm8400_dcdc_ops = { .is_enabled = wm8400_dcdc_is_enabled, .enable = wm8400_dcdc_enable, .disable = wm8400_dcdc_disable, .get_voltage = wm8400_dcdc_get_voltage, .set_voltage = wm8400_dcdc_set_voltage, .get_mode = wm8400_dcdc_get_mode, .set_mode = wm8400_dcdc_set_mode, .get_optimum_mode = wm8400_dcdc_get_optimum_mode, }; static struct regulator_desc regulators[] = { { .name = "LDO1", .id = WM8400_LDO1, .ops = &wm8400_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO2", .id = WM8400_LDO2, .ops = &wm8400_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO3", .id = WM8400_LDO3, .ops = &wm8400_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "LDO4", .id = WM8400_LDO4, .ops = &wm8400_ldo_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "DCDC1", .id = WM8400_DCDC1, .ops = &wm8400_dcdc_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "DCDC2", .id = WM8400_DCDC2, .ops = &wm8400_dcdc_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }; static int __init wm8400_regulator_probe(struct platform_device *pdev) { struct regulator_dev *rdev; rdev = regulator_register(®ulators[pdev->id], &pdev->dev, pdev->dev.driver_data); if (IS_ERR(rdev)) return PTR_ERR(rdev); return 0; } static int __devexit wm8400_regulator_remove(struct platform_device *pdev) { struct regulator_dev *rdev = platform_get_drvdata(pdev); regulator_unregister(rdev); return 0; } static struct platform_driver wm8400_regulator_driver = { .driver = { .name = "wm8400-regulator", }, .probe = wm8400_regulator_probe, .remove = __devexit_p(wm8400_regulator_remove), }; /** * wm8400_register_regulator - enable software control of a WM8400 regulator * * This function enables software control of a WM8400 regulator via * the regulator API. It is intended to be called from the * platform_init() callback of the WM8400 MFD driver. * * @param dev The WM8400 device to operate on. * @param reg The regulator to control. * @param initdata Regulator initdata for the regulator. */ int wm8400_register_regulator(struct device *dev, int reg, struct regulator_init_data *initdata) { struct wm8400 *wm8400 = dev->driver_data; if (wm8400->regulators[reg].name) return -EBUSY; initdata->driver_data = wm8400; wm8400->regulators[reg].name = "wm8400-regulator"; wm8400->regulators[reg].id = reg; wm8400->regulators[reg].dev.parent = dev; wm8400->regulators[reg].dev.driver_data = wm8400; wm8400->regulators[reg].dev.platform_data = initdata; return platform_device_register(&wm8400->regulators[reg]); } EXPORT_SYMBOL_GPL(wm8400_register_regulator); static int __init wm8400_regulator_init(void) { return platform_driver_register(&wm8400_regulator_driver); } module_init(wm8400_regulator_init); static void __exit wm8400_regulator_exit(void) { platform_driver_unregister(&wm8400_regulator_driver); } module_exit(wm8400_regulator_exit); MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); MODULE_DESCRIPTION("WM8400 regulator driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm8400-regulator");