/*
* max77686.c - Regulator driver for the Maxim 77686
*
* Copyright (C) 2012 Samsung Electronics
* Chiwoong Byun <woong.byun@smasung.com>
* Jonghwa Lee <jonghwa3.lee@samsung.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.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This driver is based on max8997.c
*/
#include <linux/kernel.h>
#include <linux/bug.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max77686.h>
#include <linux/mfd/max77686-private.h>
#define MAX77686_LDO_MINUV 800000
#define MAX77686_LDO_UVSTEP 50000
#define MAX77686_LDO_LOW_MINUV 800000
#define MAX77686_LDO_LOW_UVSTEP 25000
#define MAX77686_BUCK_MINUV 750000
#define MAX77686_BUCK_UVSTEP 50000
#define MAX77686_DVS_MINUV 600000
#define MAX77686_DVS_UVSTEP 12500
#define MAX77686_OPMODE_SHIFT 6
#define MAX77686_OPMODE_BUCK234_SHIFT 4
#define MAX77686_OPMODE_MASK 0x3
#define MAX77686_VSEL_MASK 0x3F
#define MAX77686_DVS_VSEL_MASK 0xFF
#define MAX77686_RAMP_RATE_MASK 0xC0
#define MAX77686_REGULATORS MAX77686_REG_MAX
#define MAX77686_LDOS 26
enum max77686_ramp_rate {
RAMP_RATE_13P75MV,
RAMP_RATE_27P5MV,
RAMP_RATE_55MV,
RAMP_RATE_NO_CTRL, /* 100mV/us */
};
struct max77686_data {
struct device *dev;
struct max77686_dev *iodev;
int num_regulators;
struct regulator_dev **rdev;
int ramp_delay; /* in mV/us */
};
static int max77686_set_dvs_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_selector, unsigned int new_selector)
{
struct max77686_data *max77686 = rdev_get_drvdata(rdev);
int ramp_rate[] = {13, 27, 55, 100};
return (DIV_ROUND_UP(rdev->desc->uV_step
* abs(new_selector - old_selector),
ramp_rate[max77686->ramp_delay]));
}
static int max77686_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_selector, unsigned int new_selector)
{
/* Unconditionally 100 mV/us */
return (DIV_ROUND_UP(rdev->desc->uV_step
* abs(new_selector - old_selector), 100));
}
static struct regulator_ops max77686_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = max77686_set_voltage_time_sel,
};
static struct regulator_ops max77686_buck_dvs_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = max77686_set_dvs_voltage_time_sel,
};
#define regulator_desc_ldo(num) { \
.name = "LDO"#num, \
.id = MAX77686_LDO##num, \
.ops = &max77686_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MAX77686_LDO_MINUV, \
.uV_step = MAX77686_LDO_UVSTEP, \
.n_voltages = MAX77686_VSEL_MASK + 1, \
.vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
.vsel_mask = MAX77686_VSEL_MASK, \
.enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
.enable_mask = MAX77686_OPMODE_MASK \
<< MAX77686_OPMODE_SHIFT, \
}
#define regulator_desc_ldo_low(num) { \
.name = "LDO"#num, \
.id = MAX77686_LDO##num, \
.ops = &max77686_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MAX77686_LDO_LOW_MINUV, \
.uV_step = MAX77686_LDO_LOW_UVSTEP, \
.n_voltages = MAX77686_VSEL_MASK + 1, \
.vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
.vsel_mask = MAX77686_VSEL_MASK, \
.enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
.enable_mask = MAX77686_OPMODE_MASK \
<< MAX77686_OPMODE_SHIFT, \
}
#define regulator_desc_buck(num) { \
.name = "BUCK"#num, \
.id = MAX77686_BUCK##num, \
.ops = &max77686_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MAX77686_BUCK_MINUV, \
.uV_step = MAX77686_BUCK_UVSTEP, \
.n_voltages = MAX77686_VSEL_MASK + 1, \
.vsel_reg = MAX77686_REG_BUCK5OUT + (num - 5) * 2, \
.vsel_mask = MAX77686_VSEL_MASK, \
.enable_reg = MAX77686_REG_BUCK5CTRL + (num - 5) * 2, \
.enable_mask = MAX77686_OPMODE_MASK, \
}
#define regulator_desc_buck1(num) { \
.name = "BUCK"#num, \
.id = MAX77686_BUCK##num, \
.ops = &max77686_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MAX77686_BUCK_MINUV, \
.uV_step = MAX77686_BUCK_UVSTEP, \
.n_voltages = MAX77686_VSEL_MASK + 1, \
.vsel_reg = MAX77686_REG_BUCK1OUT, \
.vsel_mask = MAX77686_VSEL_MASK, \
.enable_reg = MAX77686_REG_BUCK1CTRL, \
.enable_mask = MAX77686_OPMODE_MASK, \
}
#define regulator_desc_buck_dvs(num) { \
.name = "BUCK"#num, \
.id = MAX77686_BUCK##num, \
.ops = &max77686_buck_dvs_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MAX77686_DVS_MINUV, \
.uV_step = MAX77686_DVS_UVSTEP, \
.n_voltages = MAX77686_DVS_VSEL_MASK + 1, \
.vsel_reg = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10, \
.vsel_mask = MAX77686_DVS_VSEL_MASK, \
.enable_reg = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10, \
.enable_mask = MAX77686_OPMODE_MASK \
<< MAX77686_OPMODE_BUCK234_SHIFT, \
}
static struct regulator_desc regulators[] = {
regulator_desc_ldo_low(1),
regulator_desc_ldo_low(2),
regulator_desc_ldo(3),
regulator_desc_ldo(4),
regulator_desc_ldo(5),
regulator_desc_ldo_low(6),
regulator_desc_ldo_low(7),
regulator_desc_ldo_low(8),
regulator_desc_ldo(9),
regulator_desc_ldo(10),
regulator_desc_ldo(11),
regulator_desc_ldo(12),
regulator_desc_ldo(13),
regulator_desc_ldo(14),
regulator_desc_ldo_low(15),
regulator_desc_ldo(16),
regulator_desc_ldo(17),
regulator_desc_ldo(18),
regulator_desc_ldo(19),
regulator_desc_ldo(20),
regulator_desc_ldo(21),
regulator_desc_ldo(22),
regulator_desc_ldo(23),
regulator_desc_ldo(24),
regulator_desc_ldo(25),
regulator_desc_ldo(26),
regulator_desc_buck1(1),
regulator_desc_buck_dvs(2),
regulator_desc_buck_dvs(3),
regulator_desc_buck_dvs(4),
regulator_desc_buck(5),
regulator_desc_buck(6),
regulator_desc_buck(7),
regulator_desc_buck(8),
regulator_desc_buck(9),
};
static __devinit int max77686_pmic_probe(struct platform_device *pdev)
{
struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
struct regulator_dev **rdev;
struct max77686_data *max77686;
int i, size;
int ret = 0;
struct regulator_config config;
dev_dbg(&pdev->dev, "%s\n", __func__);
max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
GFP_KERNEL);
if (!max77686)
return -ENOMEM;
size = sizeof(struct regulator_dev *) * MAX77686_REGULATORS;
max77686->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
if (!max77686->rdev)
return -ENOMEM;
rdev = max77686->rdev;
max77686->dev = &pdev->dev;
max77686->iodev = iodev;
if (pdata)
max77686->num_regulators = pdata->num_regulators;
platform_set_drvdata(pdev, max77686);
max77686->ramp_delay = RAMP_RATE_NO_CTRL; /* Set 0x3 for RAMP */
regmap_update_bits(max77686->iodev->regmap,
MAX77686_REG_BUCK2CTRL1, MAX77686_RAMP_RATE_MASK,
max77686->ramp_delay << 6);
regmap_update_bits(max77686->iodev->regmap,
MAX77686_REG_BUCK3CTRL1, MAX77686_RAMP_RATE_MASK,
max77686->ramp_delay << 6);
regmap_update_bits(max77686->iodev->regmap,
MAX77686_REG_BUCK4CTRL1, MAX77686_RAMP_RATE_MASK,
max77686->ramp_delay << 6);
if (pdata->num_regulators == MAX77686_REGULATORS) {
for (i = 0; i < MAX77686_REGULATORS; i++) {
config.dev = max77686->dev;
config.regmap = iodev->regmap;
config.driver_data = max77686;
config.init_data = pdata->regulators[i].initdata;
rdev[i] = regulator_register(®ulators[i], &config);
if (IS_ERR(rdev[i])) {
ret = PTR_ERR(rdev[i]);
dev_err(max77686->dev,
"regulator init failed for %d\n", i);
rdev[i] = NULL;
goto err;
}
}
} else {
dev_err(max77686->dev,
"Lack of initial data for regulator's initialiation\n");
return -EINVAL;
}
return 0;
err:
for (i = 0; i < MAX77686_REGULATORS; i++) {
if (rdev[i])
regulator_unregister(rdev[i]);
}
return ret;
}
static int __devexit max77686_pmic_remove(struct platform_device *pdev)
{
struct max77686_data *max77686 = platform_get_drvdata(pdev);
struct regulator_dev **rdev = max77686->rdev;
int i;
for (i = 0; i < MAX77686_REGULATORS; i++)
if (rdev[i])
regulator_unregister(rdev[i]);
return 0;
}
static const struct platform_device_id max77686_pmic_id[] = {
{"max77686-pmic", 0},
{ },
};
MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
static struct platform_driver max77686_pmic_driver = {
.driver = {
.name = "max77686-pmic",
.owner = THIS_MODULE,
},
.probe = max77686_pmic_probe,
.remove = __devexit_p(max77686_pmic_remove),
.id_table = max77686_pmic_id,
};
static int __init max77686_pmic_init(void)
{
return platform_driver_register(&max77686_pmic_driver);
}
subsys_initcall(max77686_pmic_init);
static void __exit max77686_pmic_cleanup(void)
{
platform_driver_unregister(&max77686_pmic_driver);
}
module_exit(max77686_pmic_cleanup);
MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
MODULE_LICENSE("GPL");
