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/*
* wm8994-regulator.c -- Regulator driver for the WM8994
*
* 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/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/mfd/wm8994/core.h>
#include <linux/mfd/wm8994/registers.h>
#include <linux/mfd/wm8994/pdata.h>
struct wm8994_ldo {
struct regulator_dev *regulator;
struct wm8994 *wm8994;
};
#define WM8994_LDO1_MAX_SELECTOR 0x7
#define WM8994_LDO2_MAX_SELECTOR 0x3
static struct regulator_ops wm8994_ldo1_ops = {
.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,
};
static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
unsigned int selector)
{
struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
if (selector > WM8994_LDO2_MAX_SELECTOR)
return -EINVAL;
switch (ldo->wm8994->type) {
case WM8994:
return (selector * 100000) + 900000;
case WM8958:
return (selector * 100000) + 1000000;
case WM1811:
switch (selector) {
case 0:
return -EINVAL;
default:
return (selector * 100000) + 950000;
}
break;
default:
return -EINVAL;
}
}
static struct regulator_ops wm8994_ldo2_ops = {
.list_voltage = wm8994_ldo2_list_voltage,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
};
static const struct regulator_desc wm8994_ldo_desc[] = {
{
.name = "LDO1",
.id = 1,
.type = REGULATOR_VOLTAGE,
.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
.vsel_reg = WM8994_LDO_1,
.vsel_mask = WM8994_LDO1_VSEL_MASK,
.ops = &wm8994_ldo1_ops,
.min_uV = 2400000,
.uV_step = 100000,
.enable_time = 3000,
.owner = THIS_MODULE,
},
{
.name = "LDO2",
.id = 2,
.type = REGULATOR_VOLTAGE,
.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
.vsel_reg = WM8994_LDO_2,
.vsel_mask = WM8994_LDO2_VSEL_MASK,
.ops = &wm8994_ldo2_ops,
.enable_time = 3000,
.owner = THIS_MODULE,
},
};
static int wm8994_ldo_probe(struct platform_device *pdev)
{
struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
struct wm8994_pdata *pdata = wm8994->dev->platform_data;
int id = pdev->id % ARRAY_SIZE(pdata->ldo);
struct regulator_config config = { };
struct wm8994_ldo *ldo;
int ret;
dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
if (ldo == NULL) {
dev_err(&pdev->dev, "Unable to allocate private data\n");
return -ENOMEM;
}
ldo->wm8994 = wm8994;
config.dev = wm8994->dev;
config.driver_data = ldo;
config.regmap = wm8994->regmap;
if (pdata) {
config.init_data = pdata->ldo[id].init_data;
config.ena_gpio = pdata->ldo[id].enable;
}
ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config);
if (IS_ERR(ldo->regulator)) {
ret = PTR_ERR(ldo->regulator);
dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
id + 1, ret);
goto err;
}
platform_set_drvdata(pdev, ldo);
return 0;
err:
return ret;
}
static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
{
struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
regulator_unregister(ldo->regulator);
return 0;
}
static struct platform_driver wm8994_ldo_driver = {
.probe = wm8994_ldo_probe,
.remove = wm8994_ldo_remove,
.driver = {
.name = "wm8994-ldo",
.owner = THIS_MODULE,
},
};
static int __init wm8994_ldo_init(void)
{
int ret;
ret = platform_driver_register(&wm8994_ldo_driver);
if (ret != 0)
pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
return ret;
}
subsys_initcall(wm8994_ldo_init);
static void __exit wm8994_ldo_exit(void)
{
platform_driver_unregister(&wm8994_ldo_driver);
}
module_exit(wm8994_ldo_exit);
/* Module information */
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM8994 LDO driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8994-ldo");
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