/*
* 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 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 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");
