forked from Minki/linux
261 lines
6.1 KiB
C
261 lines
6.1 KiB
C
/*
|
|
* 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 {
|
|
int enable;
|
|
bool is_enabled;
|
|
struct regulator_dev *regulator;
|
|
struct wm8994 *wm8994;
|
|
};
|
|
|
|
#define WM8994_LDO1_MAX_SELECTOR 0x7
|
|
#define WM8994_LDO2_MAX_SELECTOR 0x3
|
|
|
|
static int wm8994_ldo_enable(struct regulator_dev *rdev)
|
|
{
|
|
struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
|
|
|
|
/* If we have no soft control assume that the LDO is always enabled. */
|
|
if (!ldo->enable)
|
|
return 0;
|
|
|
|
gpio_set_value_cansleep(ldo->enable, 1);
|
|
ldo->is_enabled = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wm8994_ldo_disable(struct regulator_dev *rdev)
|
|
{
|
|
struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
|
|
|
|
/* If we have no soft control assume that the LDO is always enabled. */
|
|
if (!ldo->enable)
|
|
return -EINVAL;
|
|
|
|
gpio_set_value_cansleep(ldo->enable, 0);
|
|
ldo->is_enabled = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wm8994_ldo_is_enabled(struct regulator_dev *rdev)
|
|
{
|
|
struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
|
|
|
|
return ldo->is_enabled;
|
|
}
|
|
|
|
static int wm8994_ldo_enable_time(struct regulator_dev *rdev)
|
|
{
|
|
/* 3ms is fairly conservative but this shouldn't be too performance
|
|
* critical; can be tweaked per-system if required. */
|
|
return 3000;
|
|
}
|
|
|
|
static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev,
|
|
unsigned int selector)
|
|
{
|
|
if (selector > WM8994_LDO1_MAX_SELECTOR)
|
|
return -EINVAL;
|
|
|
|
return (selector * 100000) + 2400000;
|
|
}
|
|
|
|
static struct regulator_ops wm8994_ldo1_ops = {
|
|
.enable = wm8994_ldo_enable,
|
|
.disable = wm8994_ldo_disable,
|
|
.is_enabled = wm8994_ldo_is_enabled,
|
|
.enable_time = wm8994_ldo_enable_time,
|
|
|
|
.list_voltage = wm8994_ldo1_list_voltage,
|
|
.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 = {
|
|
.enable = wm8994_ldo_enable,
|
|
.disable = wm8994_ldo_disable,
|
|
.is_enabled = wm8994_ldo_is_enabled,
|
|
.enable_time = wm8994_ldo_enable_time,
|
|
|
|
.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,
|
|
.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,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static __devinit 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;
|
|
|
|
if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
|
|
ldo->enable = pdata->ldo[id].enable;
|
|
|
|
ret = gpio_request_one(ldo->enable, 0, "WM8994 LDO enable");
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
|
|
ret);
|
|
goto err;
|
|
}
|
|
} else
|
|
ldo->is_enabled = true;
|
|
|
|
config.dev = wm8994->dev;
|
|
config.driver_data = ldo;
|
|
config.regmap = wm8994->regmap;
|
|
if (pdata)
|
|
config.init_data = pdata->ldo[id].init_data;
|
|
|
|
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_gpio;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, ldo);
|
|
|
|
return 0;
|
|
|
|
err_gpio:
|
|
if (gpio_is_valid(ldo->enable))
|
|
gpio_free(ldo->enable);
|
|
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);
|
|
if (gpio_is_valid(ldo->enable))
|
|
gpio_free(ldo->enable);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver wm8994_ldo_driver = {
|
|
.probe = wm8994_ldo_probe,
|
|
.remove = __devexit_p(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");
|