| /* |
| * 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/module.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/mfd/wm8400-private.h> |
| |
| static int wm8400_ldo_list_voltage(struct regulator_dev *dev, |
| unsigned selector) |
| { |
| if (selector > WM8400_LDO1_VSEL_MASK) |
| return -EINVAL; |
| |
| if (selector < 15) |
| return 900000 + (selector * 50000); |
| else |
| return 1700000 + ((selector - 15) * 100000); |
| } |
| |
| static int wm8400_ldo_map_voltage(struct regulator_dev *dev, |
| int min_uV, int max_uV) |
| { |
| u16 val; |
| int volt; |
| |
| if (min_uV < 900000 || min_uV > 3300000) |
| return -EINVAL; |
| |
| if (min_uV < 1700000) /* Steps of 50mV from 900mV; */ |
| val = DIV_ROUND_UP(min_uV - 900000, 50000); |
| else /* Steps of 100mV from 1700mV */ |
| val = DIV_ROUND_UP(min_uV - 1700000, 100000) + 15; |
| |
| volt = wm8400_ldo_list_voltage(dev, val); |
| if (volt < min_uV || volt > max_uV) |
| return -EINVAL; |
| |
| return val; |
| } |
| |
| static struct regulator_ops wm8400_ldo_ops = { |
| .is_enabled = regulator_is_enabled_regmap, |
| .enable = regulator_enable_regmap, |
| .disable = regulator_disable_regmap, |
| .list_voltage = wm8400_ldo_list_voltage, |
| .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| .map_voltage = wm8400_ldo_map_voltage, |
| }; |
| |
| 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 */ |
| return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, |
| WM8400_DC1_ACTIVE | 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 = regulator_is_enabled_regmap, |
| .enable = regulator_enable_regmap, |
| .disable = regulator_disable_regmap, |
| .list_voltage = regulator_list_voltage_linear, |
| .map_voltage = regulator_map_voltage_linear, |
| .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| .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, |
| .enable_reg = WM8400_LDO1_CONTROL, |
| .enable_mask = WM8400_LDO1_ENA, |
| .n_voltages = WM8400_LDO1_VSEL_MASK + 1, |
| .vsel_reg = WM8400_LDO1_CONTROL, |
| .vsel_mask = WM8400_LDO1_VSEL_MASK, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| }, |
| { |
| .name = "LDO2", |
| .id = WM8400_LDO2, |
| .ops = &wm8400_ldo_ops, |
| .enable_reg = WM8400_LDO2_CONTROL, |
| .enable_mask = WM8400_LDO2_ENA, |
| .n_voltages = WM8400_LDO2_VSEL_MASK + 1, |
| .type = REGULATOR_VOLTAGE, |
| .vsel_reg = WM8400_LDO2_CONTROL, |
| .vsel_mask = WM8400_LDO2_VSEL_MASK, |
| .owner = THIS_MODULE, |
| }, |
| { |
| .name = "LDO3", |
| .id = WM8400_LDO3, |
| .ops = &wm8400_ldo_ops, |
| .enable_reg = WM8400_LDO3_CONTROL, |
| .enable_mask = WM8400_LDO3_ENA, |
| .n_voltages = WM8400_LDO3_VSEL_MASK + 1, |
| .vsel_reg = WM8400_LDO3_CONTROL, |
| .vsel_mask = WM8400_LDO3_VSEL_MASK, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| }, |
| { |
| .name = "LDO4", |
| .id = WM8400_LDO4, |
| .ops = &wm8400_ldo_ops, |
| .enable_reg = WM8400_LDO4_CONTROL, |
| .enable_mask = WM8400_LDO4_ENA, |
| .n_voltages = WM8400_LDO4_VSEL_MASK + 1, |
| .vsel_reg = WM8400_LDO4_CONTROL, |
| .vsel_mask = WM8400_LDO4_VSEL_MASK, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| }, |
| { |
| .name = "DCDC1", |
| .id = WM8400_DCDC1, |
| .ops = &wm8400_dcdc_ops, |
| .enable_reg = WM8400_DCDC1_CONTROL_1, |
| .enable_mask = WM8400_DC1_ENA_MASK, |
| .n_voltages = WM8400_DC1_VSEL_MASK + 1, |
| .vsel_reg = WM8400_DCDC1_CONTROL_1, |
| .vsel_mask = WM8400_DC1_VSEL_MASK, |
| .min_uV = 850000, |
| .uV_step = 25000, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| }, |
| { |
| .name = "DCDC2", |
| .id = WM8400_DCDC2, |
| .ops = &wm8400_dcdc_ops, |
| .enable_reg = WM8400_DCDC2_CONTROL_1, |
| .enable_mask = WM8400_DC1_ENA_MASK, |
| .n_voltages = WM8400_DC2_VSEL_MASK + 1, |
| .vsel_reg = WM8400_DCDC2_CONTROL_1, |
| .vsel_mask = WM8400_DC2_VSEL_MASK, |
| .min_uV = 850000, |
| .uV_step = 25000, |
| .type = REGULATOR_VOLTAGE, |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| static int __devinit wm8400_regulator_probe(struct platform_device *pdev) |
| { |
| struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); |
| struct regulator_config config = { }; |
| struct regulator_dev *rdev; |
| |
| config.dev = &pdev->dev; |
| config.init_data = pdev->dev.platform_data; |
| config.driver_data = wm8400; |
| config.regmap = wm8400->regmap; |
| |
| rdev = regulator_register(®ulators[pdev->id], &config); |
| if (IS_ERR(rdev)) |
| return PTR_ERR(rdev); |
| |
| platform_set_drvdata(pdev, rdev); |
| |
| return 0; |
| } |
| |
| static int __devexit wm8400_regulator_remove(struct platform_device *pdev) |
| { |
| struct regulator_dev *rdev = platform_get_drvdata(pdev); |
| |
| platform_set_drvdata(pdev, NULL); |
| regulator_unregister(rdev); |
| |
| return 0; |
| } |
| |
| static struct platform_driver wm8400_regulator_driver = { |
| .driver = { |
| .name = "wm8400-regulator", |
| }, |
| .probe = wm8400_regulator_probe, |
| .remove = 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_get_drvdata(dev); |
| |
| 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.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); |
| } |
| subsys_initcall(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"); |