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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/init.h>
#include <linux/gpio.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>
struct tps65090_regulator {
struct device *dev;
struct regulator_desc *desc;
struct regulator_dev *rdev;
};
static struct regulator_ops tps65090_ext_control_ops = {
};
static struct regulator_ops tps65090_reg_contol_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
};
static struct regulator_ops tps65090_ldo_ops = {
};
#define tps65090_REG_DESC(_id, _sname, _en_reg, _ops) \
{ \
.name = "TPS65090_RAILS"#_id, \
.supply_name = _sname, \
.id = TPS65090_REGULATOR_##_id, \
.ops = &_ops, \
.enable_reg = _en_reg, \
.enable_mask = BIT(0), \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
}
static struct regulator_desc tps65090_regulator_desc[] = {
tps65090_REG_DESC(DCDC1, "vsys1", 0x0C, tps65090_reg_contol_ops),
tps65090_REG_DESC(DCDC2, "vsys2", 0x0D, tps65090_reg_contol_ops),
tps65090_REG_DESC(DCDC3, "vsys3", 0x0E, tps65090_reg_contol_ops),
tps65090_REG_DESC(FET1, "infet1", 0x0F, tps65090_reg_contol_ops),
tps65090_REG_DESC(FET2, "infet2", 0x10, tps65090_reg_contol_ops),
tps65090_REG_DESC(FET3, "infet3", 0x11, tps65090_reg_contol_ops),
tps65090_REG_DESC(FET4, "infet4", 0x12, tps65090_reg_contol_ops),
tps65090_REG_DESC(FET5, "infet5", 0x13, tps65090_reg_contol_ops),
tps65090_REG_DESC(FET6, "infet6", 0x14, tps65090_reg_contol_ops),
tps65090_REG_DESC(FET7, "infet7", 0x15, tps65090_reg_contol_ops),
tps65090_REG_DESC(LDO1, "vsys_l1", 0, tps65090_ldo_ops),
tps65090_REG_DESC(LDO2, "vsys_l2", 0, tps65090_ldo_ops),
};
static inline bool is_dcdc(int id)
{
switch (id) {
case TPS65090_REGULATOR_DCDC1:
case TPS65090_REGULATOR_DCDC2:
case TPS65090_REGULATOR_DCDC3:
return true;
default:
return false;
}
}
static int tps65090_config_ext_control(
struct tps65090_regulator *ri, bool enable)
{
int ret;
struct device *parent = ri->dev->parent;
unsigned int reg_en_reg = ri->desc->enable_reg;
if (enable)
ret = tps65090_set_bits(parent, reg_en_reg, 1);
else
ret = tps65090_clr_bits(parent, reg_en_reg, 1);
if (ret < 0)
dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
return ret;
}
static int tps65090_regulator_disable_ext_control(
struct tps65090_regulator *ri,
struct tps65090_regulator_plat_data *tps_pdata)
{
int ret = 0;
struct device *parent = ri->dev->parent;
unsigned int reg_en_reg = ri->desc->enable_reg;
/*
* First enable output for internal control if require.
* And then disable external control.
*/
if (tps_pdata->reg_init_data->constraints.always_on ||
tps_pdata->reg_init_data->constraints.boot_on) {
ret = tps65090_set_bits(parent, reg_en_reg, 0);
if (ret < 0) {
dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
return ret;
}
}
return tps65090_config_ext_control(ri, false);
}
static void tps65090_configure_regulator_config(
struct tps65090_regulator_plat_data *tps_pdata,
struct regulator_config *config)
{
if (gpio_is_valid(tps_pdata->gpio)) {
int gpio_flag = GPIOF_OUT_INIT_LOW;
if (tps_pdata->reg_init_data->constraints.always_on ||
tps_pdata->reg_init_data->constraints.boot_on)
gpio_flag = GPIOF_OUT_INIT_HIGH;
config->ena_gpio = tps_pdata->gpio;
config->ena_gpio_flags = gpio_flag;
}
}
static int tps65090_regulator_probe(struct platform_device *pdev)
{
struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
struct tps65090_regulator *ri = NULL;
struct regulator_config config = { };
struct regulator_dev *rdev;
struct tps65090_regulator_plat_data *tps_pdata;
struct tps65090_regulator *pmic;
struct tps65090_platform_data *tps65090_pdata;
int num;
int ret;
dev_dbg(&pdev->dev, "Probing regulator\n");
tps65090_pdata = dev_get_platdata(pdev->dev.parent);
if (!tps65090_pdata) {
dev_err(&pdev->dev, "Platform data missing\n");
return -EINVAL;
}
pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic),
GFP_KERNEL);
if (!pmic) {
dev_err(&pdev->dev, "mem alloc for pmic failed\n");
return -ENOMEM;
}
for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
tps_pdata = tps65090_pdata->reg_pdata[num];
ri = &pmic[num];
ri->dev = &pdev->dev;
ri->desc = &tps65090_regulator_desc[num];
/*
* TPS5090 DCDC support the control from external digital input.
* Configure it as per platform data.
*/
if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
if (tps_pdata->enable_ext_control) {
tps65090_configure_regulator_config(
tps_pdata, &config);
ri->desc->ops = &tps65090_ext_control_ops;
} else {
ret = tps65090_regulator_disable_ext_control(
ri, tps_pdata);
if (ret < 0) {
dev_err(&pdev->dev,
"failed disable ext control\n");
goto scrub;
}
}
}
config.dev = &pdev->dev;
config.driver_data = ri;
config.regmap = tps65090_mfd->rmap;
if (tps_pdata)
config.init_data = tps_pdata->reg_init_data;
else
config.init_data = NULL;
rdev = regulator_register(ri->desc, &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
ri->desc->name);
ret = PTR_ERR(rdev);
goto scrub;
}
ri->rdev = rdev;
/* Enable external control if it is require */
if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
tps_pdata->enable_ext_control) {
ret = tps65090_config_ext_control(ri, true);
if (ret < 0) {
/* Increment num to get unregister rdev */
num++;
goto scrub;
}
}
}
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_regulator *ri;
int num;
for (num = 0; num < TPS65090_REGULATOR_MAX; ++num) {
ri = &pmic[num];
regulator_unregister(ri->rdev);
}
return 0;
}
static struct platform_driver tps65090_regulator_driver = {
.driver = {
.name = "tps65090-pmic",
.owner = THIS_MODULE,
},
.probe = tps65090_regulator_probe,
.remove = 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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