/*
* Regulator driver for RICOH RC5T583 power management chip.
*
* Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
* Author: Laxman dewangan <ldewangan@nvidia.com>
*
* based on code
* Copyright (C) 2011 RICOH COMPANY,LTD
*
*
* 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/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/gpio.h>
#include <linux/mfd/rc5t583.h>
struct rc5t583_regulator_info {
int deepsleep_id;
/* Regulator register address.*/
uint8_t reg_disc_reg;
uint8_t disc_bit;
uint8_t deepsleep_reg;
/* Regulator specific turn-on delay and voltage settling time*/
int enable_uv_per_us;
int change_uv_per_us;
/* Used by regulator core */
struct regulator_desc desc;
};
struct rc5t583_regulator {
struct rc5t583_regulator_info *reg_info;
/* Devices */
struct device *dev;
struct rc5t583 *mfd;
struct regulator_dev *rdev;
};
static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
{
struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
int vsel = regulator_get_voltage_sel_regmap(rdev);
int curr_uV = regulator_list_voltage_linear(rdev, vsel);
return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
}
static int rc5t583_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_selector, unsigned int new_selector)
{
struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
int old_uV, new_uV;
old_uV = regulator_list_voltage_linear(rdev, old_selector);
if (old_uV < 0)
return old_uV;
new_uV = regulator_list_voltage_linear(rdev, new_selector);
if (new_uV < 0)
return new_uV;
return DIV_ROUND_UP(abs(old_uV - new_uV),
reg->reg_info->change_uv_per_us);
}
static struct regulator_ops rc5t583_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.enable_time = rc5t583_regulator_enable_time,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.set_voltage_time_sel = rc5t583_set_voltage_time_sel,
};
#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
_vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
{ \
.reg_disc_reg = RC5T583_REG_##_disc_reg, \
.disc_bit = _disc_bit, \
.deepsleep_reg = RC5T583_REG_##_id##DAC_DS, \
.enable_uv_per_us = _enable_mv * 1000, \
.change_uv_per_us = 40 * 1000, \
.deepsleep_id = RC5T583_DS_##_id, \
.desc = { \
.name = "rc5t583-regulator-"#_id, \
.id = RC5T583_REGULATOR_##_id, \
.n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
.ops = &rc5t583_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.vsel_reg = RC5T583_REG_##_id##DAC, \
.vsel_mask = _vout_mask, \
.enable_reg = RC5T583_REG_##_en_reg, \
.enable_mask = BIT(_en_bit), \
.min_uV = _min_mv * 1000, \
.uV_step = _step_uV, \
}, \
}
static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
};
static int __devinit rc5t583_regulator_probe(struct platform_device *pdev)
{
struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
struct regulator_init_data *reg_data;
struct regulator_config config = { };
struct rc5t583_regulator *reg = NULL;
struct rc5t583_regulator *regs;
struct regulator_dev *rdev;
struct rc5t583_regulator_info *ri;
int ret;
int id;
if (!pdata) {
dev_err(&pdev->dev, "No platform data, exiting...\n");
return -ENODEV;
}
regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
sizeof(struct rc5t583_regulator), GFP_KERNEL);
if (!regs) {
dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
return -ENOMEM;
}
for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
reg_data = pdata->reg_init_data[id];
/* No need to register if there is no regulator data */
if (!reg_data)
continue;
reg = ®s[id];
ri = &rc5t583_reg_info[id];
reg->reg_info = ri;
reg->mfd = rc5t583;
reg->dev = &pdev->dev;
if (ri->deepsleep_id == RC5T583_DS_NONE)
goto skip_ext_pwr_config;
ret = rc5t583_ext_power_req_config(rc5t583->dev,
ri->deepsleep_id,
pdata->regulator_ext_pwr_control[id],
pdata->regulator_deepsleep_slot[id]);
/*
* Configuring external control is not a major issue,
* just give warning.
*/
if (ret < 0)
dev_warn(&pdev->dev,
"Failed to configure ext control %d\n", id);
skip_ext_pwr_config:
config.dev = &pdev->dev;
config.init_data = reg_data;
config.driver_data = reg;
config.regmap = rc5t583->regmap;
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 clean_exit;
}
reg->rdev = rdev;
}
platform_set_drvdata(pdev, regs);
return 0;
clean_exit:
while (--id >= 0)
regulator_unregister(regs[id].rdev);
return ret;
}
static int __devexit rc5t583_regulator_remove(struct platform_device *pdev)
{
struct rc5t583_regulator *regs = platform_get_drvdata(pdev);
int id;
for (id = 0; id < RC5T583_REGULATOR_MAX; ++id)
regulator_unregister(regs[id].rdev);
return 0;
}
static struct platform_driver rc5t583_regulator_driver = {
.driver = {
.name = "rc5t583-regulator",
.owner = THIS_MODULE,
},
.probe = rc5t583_regulator_probe,
.remove = __devexit_p(rc5t583_regulator_remove),
};
static int __init rc5t583_regulator_init(void)
{
return platform_driver_register(&rc5t583_regulator_driver);
}
subsys_initcall(rc5t583_regulator_init);
static void __exit rc5t583_regulator_exit(void)
{
platform_driver_unregister(&rc5t583_regulator_driver);
}
module_exit(rc5t583_regulator_exit);
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_DESCRIPTION("RC5T583 regulator driver");
MODULE_ALIAS("platform:rc5t583-regulator");
MODULE_LICENSE("GPL v2");
