mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
1d7c4c115f
Fixes coccicheck warning: drivers/regulator/vexpress-regulator.c:78:1-3: WARNING: PTR_ERR_OR_ZERO can be used Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: zhengbin <zhengbin13@huawei.com> Link: https://lore.kernel.org/r/1574074762-34629-1-git-send-email-zhengbin13@huawei.com Signed-off-by: Mark Brown <broonie@kernel.org>
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// Copyright (C) 2012 ARM Limited
|
|
|
|
#define DRVNAME "vexpress-regulator"
|
|
#define pr_fmt(fmt) DRVNAME ": " fmt
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/regulator/driver.h>
|
|
#include <linux/regulator/machine.h>
|
|
#include <linux/regulator/of_regulator.h>
|
|
#include <linux/vexpress.h>
|
|
|
|
static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
|
|
{
|
|
unsigned int uV;
|
|
int err = regmap_read(regdev->regmap, 0, &uV);
|
|
|
|
return err ? err : uV;
|
|
}
|
|
|
|
static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
|
|
int min_uV, int max_uV, unsigned *selector)
|
|
{
|
|
return regmap_write(regdev->regmap, 0, min_uV);
|
|
}
|
|
|
|
static const struct regulator_ops vexpress_regulator_ops_ro = {
|
|
.get_voltage = vexpress_regulator_get_voltage,
|
|
};
|
|
|
|
static const struct regulator_ops vexpress_regulator_ops = {
|
|
.get_voltage = vexpress_regulator_get_voltage,
|
|
.set_voltage = vexpress_regulator_set_voltage,
|
|
};
|
|
|
|
static int vexpress_regulator_probe(struct platform_device *pdev)
|
|
{
|
|
struct regulator_desc *desc;
|
|
struct regulator_init_data *init_data;
|
|
struct regulator_config config = { };
|
|
struct regulator_dev *rdev;
|
|
struct regmap *regmap;
|
|
|
|
desc = devm_kzalloc(&pdev->dev, sizeof(*desc), GFP_KERNEL);
|
|
if (!desc)
|
|
return -ENOMEM;
|
|
|
|
regmap = devm_regmap_init_vexpress_config(&pdev->dev);
|
|
if (IS_ERR(regmap))
|
|
return PTR_ERR(regmap);
|
|
|
|
desc->name = dev_name(&pdev->dev);
|
|
desc->type = REGULATOR_VOLTAGE;
|
|
desc->owner = THIS_MODULE;
|
|
desc->continuous_voltage_range = true;
|
|
|
|
init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
|
|
desc);
|
|
if (!init_data)
|
|
return -EINVAL;
|
|
|
|
init_data->constraints.apply_uV = 0;
|
|
if (init_data->constraints.min_uV && init_data->constraints.max_uV)
|
|
desc->ops = &vexpress_regulator_ops;
|
|
else
|
|
desc->ops = &vexpress_regulator_ops_ro;
|
|
|
|
config.regmap = regmap;
|
|
config.dev = &pdev->dev;
|
|
config.init_data = init_data;
|
|
config.of_node = pdev->dev.of_node;
|
|
|
|
rdev = devm_regulator_register(&pdev->dev, desc, &config);
|
|
return PTR_ERR_OR_ZERO(rdev);
|
|
}
|
|
|
|
static const struct of_device_id vexpress_regulator_of_match[] = {
|
|
{ .compatible = "arm,vexpress-volt", },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, vexpress_regulator_of_match);
|
|
|
|
static struct platform_driver vexpress_regulator_driver = {
|
|
.probe = vexpress_regulator_probe,
|
|
.driver = {
|
|
.name = DRVNAME,
|
|
.of_match_table = vexpress_regulator_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(vexpress_regulator_driver);
|
|
|
|
MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
|
|
MODULE_DESCRIPTION("Versatile Express regulator");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:vexpress-regulator");
|