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/*
* Regulator driver for tps65090 power management chip.
*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/tps65090.h>
#include <linux/regulator/tps65090-regulator.h>
struct tps65090_regulator_info {
int id;
/* Regulator register address.*/
u8 reg_en_reg;
u8 en_bit;
/* used by regulator core */
struct regulator_desc desc;
};
struct tps65090_regulator {
struct tps65090_regulator_info *rinfo;
struct device *dev;
struct regulator_dev *rdev;
};
static inline struct device *to_tps65090_dev(struct regulator_dev *rdev)
{
return rdev_get_dev(rdev)->parent->parent;
}
static int tps65090_reg_is_enabled(struct regulator_dev *rdev)
{
struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps65090_dev(rdev);
uint8_t control;
int ret;
ret = tps65090_read(parent, ri->rinfo->reg_en_reg, &control);
if (ret < 0) {
dev_err(&rdev->dev, "Error in reading reg 0x%x\n",
ri->rinfo->reg_en_reg);
return ret;
}
return (((control >> ri->rinfo->en_bit) & 1) == 1);
}
static int tps65090_reg_enable(struct regulator_dev *rdev)
{
struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps65090_dev(rdev);
int ret;
ret = tps65090_set_bits(parent, ri->rinfo->reg_en_reg,
ri->rinfo->en_bit);
if (ret < 0)
dev_err(&rdev->dev, "Error in updating reg 0x%x\n",
ri->rinfo->reg_en_reg);
return ret;
}
static int tps65090_reg_disable(struct regulator_dev *rdev)
{
struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
struct device *parent = to_tps65090_dev(rdev);
int ret;
ret = tps65090_clr_bits(parent, ri->rinfo->reg_en_reg,
ri->rinfo->en_bit);
if (ret < 0)
dev_err(&rdev->dev, "Error in updating reg 0x%x\n",
ri->rinfo->reg_en_reg);
return ret;
}
static struct regulator_ops tps65090_ops = {
.enable = tps65090_reg_enable,
.disable = tps65090_reg_disable,
.is_enabled = tps65090_reg_is_enabled,
};
#define tps65090_REG(_id, _en_reg, _en_bit, _ops) \
{ \
.reg_en_reg = _en_reg, \
.en_bit = _en_bit, \
.id = TPS65090_REGULATOR_##_id, \
.desc = { \
.name = tps65090_rails(_id), \
.id = TPS65090_REGULATOR_##_id, \
.ops = &_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
}, \
}
static struct tps65090_regulator_info TPS65090_regulator_info[] = {
tps65090_REG(DCDC1, 12, 0, tps65090_ops),
tps65090_REG(DCDC2, 13, 0, tps65090_ops),
tps65090_REG(DCDC3, 14, 0, tps65090_ops),
tps65090_REG(FET1, 15, 0, tps65090_ops),
tps65090_REG(FET2, 16, 0, tps65090_ops),
tps65090_REG(FET3, 17, 0, tps65090_ops),
tps65090_REG(FET4, 18, 0, tps65090_ops),
tps65090_REG(FET5, 19, 0, tps65090_ops),
tps65090_REG(FET6, 20, 0, tps65090_ops),
tps65090_REG(FET7, 21, 0, tps65090_ops),
};
static inline struct tps65090_regulator_info *find_regulator_info(int id)
{
struct tps65090_regulator_info *rinfo;
int i;
for (i = 0; i < ARRAY_SIZE(TPS65090_regulator_info); i++) {
rinfo = &TPS65090_regulator_info[i];
if (rinfo->desc.id == id)
return rinfo;
}
return NULL;
}
static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
{
struct tps65090_regulator_info *rinfo = NULL;
struct tps65090_regulator *ri;
struct tps65090_regulator *pmic;
struct regulator_dev *rdev;
struct tps65090_regulator_platform_data *tps_pdata;
struct tps65090_platform_data *tps65090_pdata;
int id;
int num;
int ret;
dev_dbg(&pdev->dev, "Probing regulator\n");
tps65090_pdata = dev_get_platdata(pdev->dev.parent);
if (!tps65090_pdata || !tps65090_pdata->num_reg_pdata) {
dev_err(&pdev->dev, "Proper platform data missing\n");
return -EINVAL;
}
pmic = devm_kzalloc(&pdev->dev,
tps65090_pdata->num_reg_pdata * sizeof(*pmic),
GFP_KERNEL);
if (!pmic) {
dev_err(&pdev->dev, "mem alloc for pmic failed\n");
return -ENOMEM;
}
for (num = 0; num < tps65090_pdata->num_reg_pdata; ++num) {
tps_pdata = tps65090_pdata->reg_pdata[num];
if (!tps_pdata || !tps_pdata->reg_init_data) {
dev_err(&pdev->dev,
"Null platform data for regultor %d\n", num);
ret = -EINVAL;
goto scrub;
}
id = tps_pdata->id;
rinfo = find_regulator_info(id);
if (!rinfo) {
dev_err(&pdev->dev,
"invalid regulator ID %d specified\n", id);
ret = -EINVAL;
goto scrub;
}
ri = &pmic[num];
ri->dev = &pdev->dev;
ri->rinfo = rinfo;
rdev = regulator_register(&ri->rinfo->desc, &pdev->dev,
tps_pdata->reg_init_data, ri);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
ri->rinfo->desc.name);
ret = PTR_ERR(rdev);
goto scrub;
}
ri->rdev = rdev;
}
platform_set_drvdata(pdev, pmic);
return 0;
scrub:
while (--num >= 0) {
ri = &pmic[num];
regulator_unregister(ri->rdev);
}
return ret;
}
static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
{
struct tps65090_regulator *pmic = platform_get_drvdata(pdev);
struct tps65090_platform_data *tps65090_pdata;
struct tps65090_regulator *ri;
int num;
tps65090_pdata = dev_get_platdata(pdev->dev.parent);
if (!tps65090_pdata || !tps65090_pdata->num_reg_pdata)
return 0;
for (num = 0; num < tps65090_pdata->num_reg_pdata; ++num) {
ri = &pmic[num];
regulator_unregister(ri->rdev);
}
return 0;
}
static struct platform_driver tps65090_regulator_driver = {
.driver = {
.name = "tps65090-regulator",
.owner = THIS_MODULE,
},
.probe = tps65090_regulator_probe,
.remove = __devexit_p(tps65090_regulator_remove),
};
static int __init tps65090_regulator_init(void)
{
return platform_driver_register(&tps65090_regulator_driver);
}
subsys_initcall(tps65090_regulator_init);
static void __exit tps65090_regulator_exit(void)
{
platform_driver_unregister(&tps65090_regulator_driver);
}
module_exit(tps65090_regulator_exit);
MODULE_DESCRIPTION("tps65090 regulator driver");
MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
MODULE_LICENSE("GPL v2");
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