diff options
Diffstat (limited to 'drivers/regulator/wm8400-regulator.c')
| -rw-r--r-- | drivers/regulator/wm8400-regulator.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/drivers/regulator/wm8400-regulator.c b/drivers/regulator/wm8400-regulator.c new file mode 100644 index 0000000000..c4a229f66d --- /dev/null +++ b/drivers/regulator/wm8400-regulator.c @@ -0,0 +1,276 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Regulator support for WM8400 +// +// Copyright 2008 Wolfson Microelectronics PLC. +// +// Author: Mark Brown <broonie@opensource.wolfsonmicro.com> + +#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 const struct linear_range wm8400_ldo_ranges[] = { + REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000), + REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000), +}; + +static const struct regulator_ops wm8400_ldo_ops = { + .is_enabled = regulator_is_enabled_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .list_voltage = regulator_list_voltage_linear_range, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .map_voltage = regulator_map_voltage_linear_range, +}; + +static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) +{ + struct regmap *rmap = rdev_get_regmap(dev); + int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; + u16 data[2]; + int ret; + + ret = regmap_bulk_read(rmap, WM8400_DCDC1_CONTROL_1 + offset, data, 2); + 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 regmap *rmap = rdev_get_regmap(dev); + int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; + int ret; + + switch (mode) { + case REGULATOR_MODE_FAST: + /* Datasheet: active with force PWM */ + ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset, + WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); + if (ret != 0) + return ret; + + return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset, + WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, + WM8400_DC1_ACTIVE); + + case REGULATOR_MODE_NORMAL: + /* Datasheet: active */ + ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset, + WM8400_DC1_FRC_PWM, 0); + if (ret != 0) + return ret; + + return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset, + WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, + WM8400_DC1_ACTIVE); + + case REGULATOR_MODE_IDLE: + /* Datasheet: standby */ + return regmap_update_bits(rmap, 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 const 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, + .linear_ranges = wm8400_ldo_ranges, + .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), + .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, + .linear_ranges = wm8400_ldo_ranges, + .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), + .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, + .linear_ranges = wm8400_ldo_ranges, + .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), + .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, + .linear_ranges = wm8400_ldo_ranges, + .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), + .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_DC2_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 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 = dev_get_platdata(&pdev->dev); + config.driver_data = wm8400; + config.regmap = wm8400->regmap; + + rdev = devm_regulator_register(&pdev->dev, ®ulators[pdev->id], + &config); + if (IS_ERR(rdev)) + return PTR_ERR(rdev); + + platform_set_drvdata(pdev, rdev); + + return 0; +} + +static struct platform_driver wm8400_regulator_driver = { + .driver = { + .name = "wm8400-regulator", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .probe = wm8400_regulator_probe, +}; + +/** + * 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. + * + * @dev: The WM8400 device to operate on. + * @reg: The regulator to control. + * @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"); |