/*
* max14577.c - Regulator driver for the Maxim 14577
*
* Copyright (C) 2013 Samsung Electronics
* Krzysztof Kozlowski <k.kozlowski@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.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/max14577.h>
#include <linux/mfd/max14577-private.h>
#include <linux/regulator/of_regulator.h>
struct max14577_regulator {
struct device *dev;
struct max14577 *max14577;
struct regulator_dev **regulators;
};
static int max14577_reg_is_enabled(struct regulator_dev *rdev)
{
int rid = rdev_get_id(rdev);
struct regmap *rmap = rdev->regmap;
u8 reg_data;
switch (rid) {
case MAX14577_CHARGER:
max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data);
if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
return 0;
max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data);
if ((reg_data & STATUS3_CGMBC_MASK) == 0)
return 0;
/* MBCHOSTEN and CGMBC are on */
return 1;
default:
return -EINVAL;
}
}
static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
{
u8 reg_data;
struct regmap *rmap = rdev->regmap;
if (rdev_get_id(rdev) != MAX14577_CHARGER)
return -EINVAL;
max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data);
if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
return MAX14577_REGULATOR_CURRENT_LIMIT_MIN;
reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
CHGCTRL4_MBCICHWRCH_SHIFT);
return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP;
}
static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
int i, current_bits = 0xf;
u8 reg_data;
if (rdev_get_id(rdev) != MAX14577_CHARGER)
return -EINVAL;
if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX ||
max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN)
return -EINVAL;
if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) {
/* Less than 200 mA, so set 90mA (turn only Low Bit off) */
u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT;
return max14577_update_reg(rdev->regmap,
MAX14577_CHG_REG_CHG_CTRL4,
CHGCTRL4_MBCICHWRCL_MASK, reg_data);
}
/* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for
* valid current starting from LIMIT_MAX. */
for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX;
i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START;
i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) {
if (i <= max_uA)
break;
current_bits--;
}
BUG_ON(current_bits < 0); /* Cannot happen */
/* Turn Low Bit on (use range 200mA-950 mA) */
reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
/* and set proper High Bits */
reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;
return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
reg_data);
}
static struct regulator_ops max14577_safeout_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.list_voltage = regulator_list_voltage_linear,
};
static struct regulator_ops max14577_charger_ops = {
.is_enabled = max14577_reg_is_enabled,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_current_limit = max14577_reg_get_current_limit,
.set_current_limit = max14577_reg_set_current_limit,
};
static const struct regulator_desc supported_regulators[] = {
[MAX14577_SAFEOUT] = {
.name = "SAFEOUT",
.id = MAX14577_SAFEOUT,
.ops = &max14577_safeout_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.n_voltages = 1,
.min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
.enable_reg = MAX14577_REG_CONTROL2,
.enable_mask = CTRL2_SFOUTORD_MASK,
},
[MAX14577_CHARGER] = {
.name = "CHARGER",
.id = MAX14577_CHARGER,
.ops = &max14577_charger_ops,
.type = REGULATOR_CURRENT,
.owner = THIS_MODULE,
.enable_reg = MAX14577_CHG_REG_CHG_CTRL2,
.enable_mask = CHGCTRL2_MBCHOSTEN_MASK,
},
};
#ifdef CONFIG_OF
static struct of_regulator_match max14577_regulator_matches[] = {
{ .name = "SAFEOUT", },
{ .name = "CHARGER", },
};
static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
{
int ret;
struct device_node *np;
np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
if (!np) {
dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
return -EINVAL;
}
ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches,
MAX14577_REG_MAX);
if (ret < 0) {
dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
return ret;
}
return 0;
}
static inline struct regulator_init_data *match_init_data(int index)
{
return max14577_regulator_matches[index].init_data;
}
static inline struct device_node *match_of_node(int index)
{
return max14577_regulator_matches[index].of_node;
}
#else /* CONFIG_OF */
static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
{
return 0;
}
static inline struct regulator_init_data *match_init_data(int index)
{
return NULL;
}
static inline struct device_node *match_of_node(int index)
{
return NULL;
}
#endif /* CONFIG_OF */
static int max14577_regulator_probe(struct platform_device *pdev)
{
struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
int i, ret;
struct regulator_config config = {};
ret = max14577_regulator_dt_parse_pdata(pdev);
if (ret)
return ret;
config.dev = &pdev->dev;
config.regmap = max14577->regmap;
for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) {
struct regulator_dev *regulator;
/*
* Index of supported_regulators[] is also the id and must
* match index of pdata->regulators[].
*/
if (pdata && pdata->regulators) {
config.init_data = pdata->regulators[i].initdata;
config.of_node = pdata->regulators[i].of_node;
} else {
config.init_data = match_init_data(i);
config.of_node = match_of_node(i);
}
regulator = devm_regulator_register(&pdev->dev,
&supported_regulators[i], &config);
if (IS_ERR(regulator)) {
ret = PTR_ERR(regulator);
dev_err(&pdev->dev,
"Regulator init failed for ID %d with error: %d\n",
i, ret);
return ret;
}
}
return ret;
}
static struct platform_driver max14577_regulator_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "max14577-regulator",
},
.probe = max14577_regulator_probe,
};
static int __init max14577_regulator_init(void)
{
BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
MAX14577_REGULATOR_CURRENT_LIMIT_MAX);
BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX);
return platform_driver_register(&max14577_regulator_driver);
}
subsys_initcall(max14577_regulator_init);
static void __exit max14577_regulator_exit(void)
{
platform_driver_unregister(&max14577_regulator_driver);
}
module_exit(max14577_regulator_exit);
MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
MODULE_DESCRIPTION("MAXIM 14577 regulator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:max14577-regulator");
