/*
* max77686.c - Regulator driver for the Maxim 77686
*
* Copyright (C) 2012 Samsung Electronics
* Chiwoong Byun <woong.byun@samsung.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/err.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.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_RAMP_DELAY 100000 /* uV/us */
#define MAX77686_DVS_RAMP_DELAY 27500 /* uV/us */
#define MAX77686_DVS_MINUV 600000
#define MAX77686_DVS_UVSTEP 12500
/*
* Value for configuring buck[89] and LDO{20,21,22} as GPIO control.
* It is the same as 'off' for other regulators.
*/
#define MAX77686_GPIO_CONTROL 0x0
/*
* Values used for configuring LDOs and bucks.
* Forcing low power mode: LDO1, 3-5, 9, 13, 17-26
*/
#define MAX77686_LDO_LOWPOWER 0x1
/*
* On/off controlled by PWRREQ:
* - LDO2, 6-8, 10-12, 14-16
* - buck[1234]
*/
#define MAX77686_OFF_PWRREQ 0x1
/* Low power mode controlled by PWRREQ: All LDOs */
#define MAX77686_LDO_LOWPOWER_PWRREQ 0x2
/* Forcing low power mode: buck[234] */
#define MAX77686_BUCK_LOWPOWER 0x2
#define MAX77686_NORMAL 0x3
#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 {
DECLARE_BITMAP(gpio_enabled, MAX77686_REGULATORS);
/* Array indexed by regulator id */
unsigned int opmode[MAX77686_REGULATORS];
};
static unsigned int max77686_get_opmode_shift(int id)
{
switch (id) {
case MAX77686_BUCK1:
case MAX77686_BUCK5 ... MAX77686_BUCK9:
return 0;
case MAX77686_BUCK2 ... MAX77686_BUCK4:
return MAX77686_OPMODE_BUCK234_SHIFT;
default:
/* all LDOs */
return MAX77686_OPMODE_SHIFT;
}
}
/*
* When regulator is configured for GPIO control then it
* replaces "normal" mode. Any change from low power mode to normal
* should actually change to GPIO control.
* Map normal mode to proper value for such regulators.
*/
static unsigned int max77686_map_normal_mode(struct max77686_data *max77686,
int id)
{
switch (id) {
case MAX77686_BUCK8:
case MAX77686_BUCK9:
case MAX77686_LDO20 ... MAX77686_LDO22:
if (test_bit(id, max77686->gpio_enabled))
return MAX77686_GPIO_CONTROL;
}
return MAX77686_NORMAL;
}
/* Some BUCKs and LDOs supports Normal[ON/OFF] mode during suspend */
static int max77686_set_suspend_disable(struct regulator_dev *rdev)
{
unsigned int val, shift;
struct max77686_data *max77686 = rdev_get_drvdata(rdev);
int ret, id = rdev_get_id(rdev);
shift = max77686_get_opmode_shift(id);
val = MAX77686_OFF_PWRREQ;
ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask, val << shift);
if (ret)
return ret;
max77686->opmode[id] = val;
return 0;
}
/* Some LDOs supports [LPM/Normal]ON mode during suspend state */
static int max77686_set_suspend_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct max77686_data *max77686 = rdev_get_drvdata(rdev);
unsigned int val;
int ret, id = rdev_get_id(rdev);
/* BUCK[5-9] doesn't support this feature */
if (id >= MAX77686_BUCK5)
return 0;
switch (mode) {
case REGULATOR_MODE_IDLE: /* ON in LP Mode */
val = MAX77686_LDO_LOWPOWER_PWRREQ;
break;
case REGULATOR_MODE_NORMAL: /* ON in Normal Mode */
val = max77686_map_normal_mode(max77686, id);
break;
default:
pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
rdev->desc->name, mode);
return -EINVAL;
}
ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask,
val << MAX77686_OPMODE_SHIFT);
if (ret)
return ret;
max77686->opmode[id] = val;
return 0;
}
/* Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state */
static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
unsigned int mode)
{
unsigned int val;
struct max77686_data *max77686 = rdev_get_drvdata(rdev);
int ret, id = rdev_get_id(rdev);
switch (mode) {
case REGULATOR_MODE_STANDBY: /* switch off */
val = MAX77686_OFF_PWRREQ;
break;
case REGULATOR_MODE_IDLE: /* ON in LP Mode */
val = MAX77686_LDO_LOWPOWER_PWRREQ;
break;
case REGULATOR_MODE_NORMAL: /* ON in Normal Mode */
val = max77686_map_normal_mode(max77686, id);
break;
default:
pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
rdev->desc->name, mode);
return -EINVAL;
}
ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask,
val << MAX77686_OPMODE_SHIFT);
if (ret)
return ret;
max77686->opmode[id] = val;
return 0;
}
static int max77686_enable(struct regulator_dev *rdev)
{
struct max77686_data *max77686 = rdev_get_drvdata(rdev);
unsigned int shift;
int id = rdev_get_id(rdev);
shift = max77686_get_opmode_shift(id);
if (max77686->opmode[id] == MAX77686_OFF_PWRREQ)
max77686->opmode[id] = max77686_map_normal_mode(max77686, id);
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask,
max77686->opmode[id] << shift);
}
static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
unsigned int ramp_value = RAMP_RATE_NO_CTRL;
switch (ramp_delay) {
case 1 ... 13750:
ramp_value = RAMP_RATE_13P75MV;
break;
case 13751 ... 27500:
ramp_value = RAMP_RATE_27P5MV;
break;
case 27501 ... 55000:
ramp_value = RAMP_RATE_55MV;
break;
case 55001 ... 100000:
break;
default:
pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
rdev->desc->name, ramp_delay);
}
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
MAX77686_RAMP_RATE_MASK, ramp_value << 6);
}
static int max77686_of_parse_cb(struct device_node *np,
const struct regulator_desc *desc,
struct regulator_config *config)
{
struct max77686_data *max77686 = config->driver_data;
switch (desc->id) {
case MAX77686_BUCK8:
case MAX77686_BUCK9:
case MAX77686_LDO20 ... MAX77686_LDO22:
config->ena_gpio = of_get_named_gpio(np,
"maxim,ena-gpios", 0);
config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
config->ena_gpio_initialized = true;
break;
default:
return 0;
}
if (gpio_is_valid(config->ena_gpio)) {
set_bit(desc->id, max77686->gpio_enabled);
return regmap_update_bits(config->regmap, desc->enable_reg,
desc->enable_mask,
MAX77686_GPIO_CONTROL);
}
return 0;
}
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 = max77686_enable,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_suspend_mode = max77686_set_suspend_mode,
};
static struct regulator_ops max77686_ldo_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = max77686_enable,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_suspend_mode = max77686_ldo_set_suspend_mode,
.set_suspend_disable = max77686_set_suspend_disable,
};
static struct regulator_ops max77686_buck1_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = max77686_enable,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_suspend_disable = max77686_set_suspend_disable,
};
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 = max77686_enable,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_ramp_delay = max77686_set_ramp_delay,
.set_suspend_disable = max77686_set_suspend_disable,
};
#define regulator_desc_ldo(num) { \
.name = "LDO"#num, \
.of_match = of_match_ptr("LDO"#num), \
.regulators_node = of_match_ptr("voltage-regulators"), \
.of_parse_cb = max77686_of_parse_cb, \
.id = MAX77686_LDO##num, \
.ops = &max77686_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MAX77686_LDO_MINUV, \
.uV_step = MAX77686_LDO_UVSTEP, \
.ramp_delay = MAX77686_RAMP_DELAY, \
.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_lpm_ldo(num) { \
.name = "LDO"#num, \
.of_match = of_match_ptr("LDO"#num), \
.regulators_node = of_match_ptr("voltage-regulators"), \
.id = MAX77686_LDO##num, \
.ops = &max77686_ldo_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MAX77686_LDO_MINUV, \
.uV_step = MAX77686_LDO_UVSTEP, \
.ramp_delay = MAX77686_RAMP_DELAY, \
.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, \
.of_match = of_match_ptr("LDO"#num), \
.regulators_node = of_match_ptr("voltage-regulators"), \
.id = MAX77686_LDO##num, \
.ops = &max77686_ldo_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MAX77686_LDO_LOW_MINUV, \
.uV_step = MAX77686_LDO_LOW_UVSTEP, \
.ramp_delay = MAX77686_RAMP_DELAY, \
.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_ldo1_low(num) { \
.name = "LDO"#num, \
.of_match = of_match_ptr("LDO"#num), \
.regulators_node = of_match_ptr("voltage-regulators"), \
.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, \
.ramp_delay = MAX77686_RAMP_DELAY, \
.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, \
.of_match = of_match_ptr("BUCK"#num), \
.regulators_node = of_match_ptr("voltage-regulators"), \
.of_parse_cb = max77686_of_parse_cb, \
.id = MAX77686_BUCK##num, \
.ops = &max77686_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MAX77686_BUCK_MINUV, \
.uV_step = MAX77686_BUCK_UVSTEP, \
.ramp_delay = MAX77686_RAMP_DELAY, \
.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, \
.of_match = of_match_ptr("BUCK"#num), \
.regulators_node = of_match_ptr("voltage-regulators"), \
.id = MAX77686_BUCK##num, \
.ops = &max77686_buck1_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MAX77686_BUCK_MINUV, \
.uV_step = MAX77686_BUCK_UVSTEP, \
.ramp_delay = MAX77686_RAMP_DELAY, \
.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, \
.of_match = of_match_ptr("BUCK"#num), \
.regulators_node = of_match_ptr("voltage-regulators"), \
.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, \
.ramp_delay = MAX77686_DVS_RAMP_DELAY, \
.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 const struct regulator_desc regulators[] = {
regulator_desc_ldo1_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_lpm_ldo(10),
regulator_desc_lpm_ldo(11),
regulator_desc_lpm_ldo(12),
regulator_desc_ldo(13),
regulator_desc_lpm_ldo(14),
regulator_desc_ldo_low(15),
regulator_desc_lpm_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 int max77686_pmic_probe(struct platform_device *pdev)
{
struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max77686_data *max77686;
int i;
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;
config.dev = iodev->dev;
config.regmap = iodev->regmap;
config.driver_data = max77686;
platform_set_drvdata(pdev, max77686);
for (i = 0; i < MAX77686_REGULATORS; i++) {
struct regulator_dev *rdev;
int id = regulators[i].id;
max77686->opmode[id] = MAX77686_NORMAL;
rdev = devm_regulator_register(&pdev->dev,
®ulators[i], &config);
if (IS_ERR(rdev)) {
int ret = PTR_ERR(rdev);
dev_err(&pdev->dev,
"regulator init failed for %d: %d\n", i, ret);
return ret;
}
}
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",
},
.probe = max77686_pmic_probe,
.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");
