/*
* linux/drivers/regulator/aat2870-regulator.c
*
* Copyright (c) 2011, NVIDIA Corporation.
* Author: Jin Park <jinyoungp@nvidia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/aat2870.h>
struct aat2870_regulator {
struct platform_device *pdev;
struct regulator_desc desc;
const int *voltages; /* uV */
int min_uV;
int max_uV;
u8 enable_addr;
u8 enable_shift;
u8 enable_mask;
u8 voltage_addr;
u8 voltage_shift;
u8 voltage_mask;
};
static int aat2870_ldo_list_voltage(struct regulator_dev *rdev,
unsigned selector)
{
struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
return ri->voltages[selector];
}
static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
unsigned selector)
{
struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
(selector << ri->voltage_shift) & ri->voltage_mask);
}
static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
{
struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
u8 val;
int ret;
ret = aat2870->read(aat2870, ri->voltage_addr, &val);
if (ret)
return ret;
return (val & ri->voltage_mask) >> ri->voltage_shift;
}
static int aat2870_ldo_enable(struct regulator_dev *rdev)
{
struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
ri->enable_mask);
}
static int aat2870_ldo_disable(struct regulator_dev *rdev)
{
struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
}
static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
{
struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
u8 val;
int ret;
ret = aat2870->read(aat2870, ri->enable_addr, &val);
if (ret)
return ret;
return val & ri->enable_mask ? 1 : 0;
}
static struct regulator_ops aat2870_ldo_ops = {
.list_voltage = aat2870_ldo_list_voltage,
.set_voltage_sel = aat2870_ldo_set_voltage_sel,
.get_voltage_sel = aat2870_ldo_get_voltage_sel,
.enable = aat2870_ldo_enable,
.disable = aat2870_ldo_disable,
.is_enabled = aat2870_ldo_is_enabled,
};
static const int aat2870_ldo_voltages[] = {
1200000, 1300000, 1500000, 1600000,
1800000, 2000000, 2200000, 2500000,
2600000, 2700000, 2800000, 2900000,
3000000, 3100000, 3200000, 3300000,
};
#define AAT2870_LDO(ids) \
{ \
.desc = { \
.name = #ids, \
.id = AAT2870_ID_##ids, \
.n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \
.ops = &aat2870_ldo_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
}, \
.voltages = aat2870_ldo_voltages, \
.min_uV = 1200000, \
.max_uV = 3300000, \
}
static struct aat2870_regulator aat2870_regulators[] = {
AAT2870_LDO(LDOA),
AAT2870_LDO(LDOB),
AAT2870_LDO(LDOC),
AAT2870_LDO(LDOD),
};
static struct aat2870_regulator *aat2870_get_regulator(int id)
{
struct aat2870_regulator *ri = NULL;
int i;
for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
ri = &aat2870_regulators[i];
if (ri->desc.id == id)
break;
}
if (i == ARRAY_SIZE(aat2870_regulators))
return NULL;
ri->enable_addr = AAT2870_LDO_EN;
ri->enable_shift = id - AAT2870_ID_LDOA;
ri->enable_mask = 0x1 << ri->enable_shift;
ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
AAT2870_LDO_CD : AAT2870_LDO_AB;
ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
ri->voltage_mask = 0xF << ri->voltage_shift;
return ri;
}
static int aat2870_regulator_probe(struct platform_device *pdev)
{
struct aat2870_regulator *ri;
struct regulator_dev *rdev;
ri = aat2870_get_regulator(pdev->id);
if (!ri) {
dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
return -EINVAL;
}
ri->pdev = pdev;
rdev = regulator_register(&ri->desc, &pdev->dev,
pdev->dev.platform_data, ri);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "Failed to register regulator %s\n",
ri->desc.name);
return PTR_ERR(rdev);
}
platform_set_drvdata(pdev, rdev);
return 0;
}
static int __devexit aat2870_regulator_remove(struct platform_device *pdev)
{
struct regulator_dev *rdev = platform_get_drvdata(pdev);
regulator_unregister(rdev);
return 0;
}
static struct platform_driver aat2870_regulator_driver = {
.driver = {
.name = "aat2870-regulator",
.owner = THIS_MODULE,
},
.probe = aat2870_regulator_probe,
.remove = __devexit_p(aat2870_regulator_remove),
};
static int __init aat2870_regulator_init(void)
{
return platform_driver_register(&aat2870_regulator_driver);
}
subsys_initcall(aat2870_regulator_init);
static void __exit aat2870_regulator_exit(void)
{
platform_driver_unregister(&aat2870_regulator_driver);
}
module_exit(aat2870_regulator_exit);
MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
