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linux/drivers/regulator/max77693.c
Axel Lin 8c7e7ddf31 regulator: max77693: Remove NULL test for rmatch[i].init_data 
The implementation in of_regulator_match() already ensures match->init_data is
not NULL for all matched cases if the return value of of_regulator_match() > 0.

Thus remove NULL test for rmatch[i].init_data.

This patch also fixes the condition for loop iteration.
The for loop should iterate "matched" times rather than ARRAY_SIZE(regulators)
because we only allocate "matched" number of entries for rdata.
Though in most cases, "matched" == ARRAY_SIZE(regulators).

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-01 11:16:15 +01:00

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/*
* max77693.c - Regulator driver for the Maxim 77693
*
* Copyright (C) 2013 Samsung Electronics
* 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 max77686.c
*/
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-private.h>
#include <linux/regulator/of_regulator.h>
#define CHGIN_ILIM_STEP_20mA 20000
struct max77693_pmic_dev {
struct device *dev;
struct max77693_dev *iodev;
int num_regulators;
struct regulator_dev **rdev;
};
/* CHARGER regulator ops */
/* CHARGER regulator uses two bits for enabling */
static int max77693_chg_is_enabled(struct regulator_dev *rdev)
{
int ret;
u8 val;
ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val);
if (ret)
return ret;
return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
}
/*
* CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
* 0x00, 0x01, 0x2, 0x03 = 60 mA
* 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA
*/
static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
{
unsigned int chg_min_uA = rdev->constraints->min_uA;
unsigned int chg_max_uA = rdev->constraints->max_uA;
u8 reg, sel;
unsigned int val;
int ret;
ret = max77693_read_reg(rdev->regmap,
MAX77693_CHG_REG_CHG_CNFG_09, &reg);
if (ret < 0)
return ret;
sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
/* the first four codes for charger current are all 60mA */
if (sel <= 3)
sel = 0;
else
sel -= 3;
val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
if (val > chg_max_uA)
return -EINVAL;
return val;
}
static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
unsigned int chg_min_uA = rdev->constraints->min_uA;
int sel = 0;
while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
sel++;
if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
return -EINVAL;
/* the first four codes for charger current are all 60mA */
sel += 3;
return max77693_write_reg(rdev->regmap,
MAX77693_CHG_REG_CHG_CNFG_09, sel);
}
/* end of CHARGER regulator ops */
static const unsigned int max77693_safeout_table[] = {
4850000,
4900000,
4950000,
3300000,
};
static struct regulator_ops max77693_safeout_ops = {
.list_voltage = regulator_list_voltage_table,
.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,
};
static struct regulator_ops max77693_charger_ops = {
.is_enabled = max77693_chg_is_enabled,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_current_limit = max77693_chg_get_current_limit,
.set_current_limit = max77693_chg_set_current_limit,
};
#define regulator_desc_esafeout(_num) { \
.name = "ESAFEOUT"#_num, \
.id = MAX77693_ESAFEOUT##_num, \
.n_voltages = 4, \
.ops = &max77693_safeout_ops, \
.type = REGULATOR_VOLTAGE, \
.volt_table = max77693_safeout_table, \
.vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
.vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \
.enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
.enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
}
static struct regulator_desc regulators[] = {
regulator_desc_esafeout(1),
regulator_desc_esafeout(2),
{
.name = "CHARGER",
.id = MAX77693_CHARGER,
.ops = &max77693_charger_ops,
.type = REGULATOR_CURRENT,
.owner = THIS_MODULE,
.enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
.enable_mask = CHG_CNFG_00_CHG_MASK |
CHG_CNFG_00_BUCK_MASK,
},
};
#ifdef CONFIG_OF
static int max77693_pmic_dt_parse_rdata(struct device *dev,
struct max77693_regulator_data **rdata)
{
struct device_node *np;
struct of_regulator_match *rmatch;
struct max77693_regulator_data *tmp;
int i, matched = 0;
np = of_find_node_by_name(dev->parent->of_node, "regulators");
if (!np)
return -EINVAL;
rmatch = devm_kzalloc(dev,
sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL);
if (!rmatch)
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(regulators); i++)
rmatch[i].name = regulators[i].name;
matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
if (matched <= 0)
return matched;
*rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL);
if (!(*rdata))
return -ENOMEM;
tmp = *rdata;
for (i = 0; i < matched; i++) {
tmp->initdata = rmatch[i].init_data;
tmp->of_node = rmatch[i].of_node;
tmp->id = regulators[i].id;
tmp++;
}
return matched;
}
#else
static int max77693_pmic_dt_parse_rdata(struct device *dev,
struct max77693_regulator_data **rdata)
{
return 0;
}
#endif /* CONFIG_OF */
static int max77693_pmic_init_rdata(struct device *dev,
struct max77693_regulator_data **rdata)
{
struct max77693_platform_data *pdata;
int num_regulators = 0;
pdata = dev_get_platdata(dev->parent);
if (pdata) {
*rdata = pdata->regulators;
num_regulators = pdata->num_regulators;
}
if (!(*rdata) && dev->parent->of_node)
num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);
return num_regulators;
}
static int max77693_pmic_probe(struct platform_device *pdev)
{
struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max77693_pmic_dev *max77693_pmic;
struct max77693_regulator_data *rdata = NULL;
int num_rdata, i, ret;
struct regulator_config config;
num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
if (!rdata || num_rdata <= 0) {
dev_err(&pdev->dev, "No init data supplied.\n");
return -ENODEV;
}
max77693_pmic = devm_kzalloc(&pdev->dev,
sizeof(struct max77693_pmic_dev),
GFP_KERNEL);
if (!max77693_pmic)
return -ENOMEM;
max77693_pmic->rdev = devm_kzalloc(&pdev->dev,
sizeof(struct regulator_dev *) * num_rdata,
GFP_KERNEL);
if (!max77693_pmic->rdev)
return -ENOMEM;
max77693_pmic->dev = &pdev->dev;
max77693_pmic->iodev = iodev;
max77693_pmic->num_regulators = num_rdata;
config.dev = &pdev->dev;
config.regmap = iodev->regmap;
config.driver_data = max77693_pmic;
platform_set_drvdata(pdev, max77693_pmic);
for (i = 0; i < max77693_pmic->num_regulators; i++) {
int id = rdata[i].id;
config.init_data = rdata[i].initdata;
config.of_node = rdata[i].of_node;
max77693_pmic->rdev[i] = regulator_register(&regulators[id],
&config);
if (IS_ERR(max77693_pmic->rdev[i])) {
ret = PTR_ERR(max77693_pmic->rdev[i]);
dev_err(max77693_pmic->dev,
"Failed to initialize regulator-%d\n", id);
max77693_pmic->rdev[i] = NULL;
goto err;
}
}
return 0;
err:
while (--i >= 0)
regulator_unregister(max77693_pmic->rdev[i]);
return ret;
}
static int max77693_pmic_remove(struct platform_device *pdev)
{
struct max77693_pmic_dev *max77693_pmic = platform_get_drvdata(pdev);
struct regulator_dev **rdev = max77693_pmic->rdev;
int i;
for (i = 0; i < max77693_pmic->num_regulators; i++)
if (rdev[i])
regulator_unregister(rdev[i]);
return 0;
}
static const struct platform_device_id max77693_pmic_id[] = {
{"max77693-pmic", 0},
{},
};
MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
static struct platform_driver max77693_pmic_driver = {
.driver = {
.name = "max77693-pmic",
.owner = THIS_MODULE,
},
.probe = max77693_pmic_probe,
.remove = max77693_pmic_remove,
.id_table = max77693_pmic_id,
};
module_platform_driver(max77693_pmic_driver);
MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
MODULE_LICENSE("GPL");
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