mirror of
https://github.com/torvalds/linux.git
synced 2024-12-07 11:31:41 +00:00
ba499a50ce
Use DEVICE_ATTR_RO/RW macro helper instead of plain DEVICE_ATTR, which makes the code a bit shorter and easier to read. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Link: https://lore.kernel.org/r/20210602080526.11117-1-thunder.leizhen@huawei.com Signed-off-by: Mark Brown <broonie@kernel.org>
182 lines
4.2 KiB
C
182 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* userspace-consumer.c
|
|
*
|
|
* Copyright 2009 CompuLab, Ltd.
|
|
*
|
|
* Author: Mike Rapoport <mike@compulab.co.il>
|
|
*
|
|
* Based of virtual consumer driver:
|
|
* Copyright 2008 Wolfson Microelectronics PLC.
|
|
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/regulator/userspace-consumer.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct userspace_consumer_data {
|
|
const char *name;
|
|
|
|
struct mutex lock;
|
|
bool enabled;
|
|
|
|
int num_supplies;
|
|
struct regulator_bulk_data *supplies;
|
|
};
|
|
|
|
static ssize_t name_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct userspace_consumer_data *data = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%s\n", data->name);
|
|
}
|
|
|
|
static ssize_t state_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct userspace_consumer_data *data = dev_get_drvdata(dev);
|
|
|
|
if (data->enabled)
|
|
return sprintf(buf, "enabled\n");
|
|
|
|
return sprintf(buf, "disabled\n");
|
|
}
|
|
|
|
static ssize_t state_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct userspace_consumer_data *data = dev_get_drvdata(dev);
|
|
bool enabled;
|
|
int ret;
|
|
|
|
/*
|
|
* sysfs_streq() doesn't need the \n's, but we add them so the strings
|
|
* will be shared with show_state(), above.
|
|
*/
|
|
if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1"))
|
|
enabled = true;
|
|
else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0"))
|
|
enabled = false;
|
|
else {
|
|
dev_err(dev, "Configuring invalid mode\n");
|
|
return count;
|
|
}
|
|
|
|
mutex_lock(&data->lock);
|
|
if (enabled != data->enabled) {
|
|
if (enabled)
|
|
ret = regulator_bulk_enable(data->num_supplies,
|
|
data->supplies);
|
|
else
|
|
ret = regulator_bulk_disable(data->num_supplies,
|
|
data->supplies);
|
|
|
|
if (ret == 0)
|
|
data->enabled = enabled;
|
|
else
|
|
dev_err(dev, "Failed to configure state: %d\n", ret);
|
|
}
|
|
mutex_unlock(&data->lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(name);
|
|
static DEVICE_ATTR_RW(state);
|
|
|
|
static struct attribute *attributes[] = {
|
|
&dev_attr_name.attr,
|
|
&dev_attr_state.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group attr_group = {
|
|
.attrs = attributes,
|
|
};
|
|
|
|
static int regulator_userspace_consumer_probe(struct platform_device *pdev)
|
|
{
|
|
struct regulator_userspace_consumer_data *pdata;
|
|
struct userspace_consumer_data *drvdata;
|
|
int ret;
|
|
|
|
pdata = dev_get_platdata(&pdev->dev);
|
|
if (!pdata)
|
|
return -EINVAL;
|
|
|
|
drvdata = devm_kzalloc(&pdev->dev,
|
|
sizeof(struct userspace_consumer_data),
|
|
GFP_KERNEL);
|
|
if (drvdata == NULL)
|
|
return -ENOMEM;
|
|
|
|
drvdata->name = pdata->name;
|
|
drvdata->num_supplies = pdata->num_supplies;
|
|
drvdata->supplies = pdata->supplies;
|
|
|
|
mutex_init(&drvdata->lock);
|
|
|
|
ret = devm_regulator_bulk_get(&pdev->dev, drvdata->num_supplies,
|
|
drvdata->supplies);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = sysfs_create_group(&pdev->dev.kobj, &attr_group);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
if (pdata->init_on) {
|
|
ret = regulator_bulk_enable(drvdata->num_supplies,
|
|
drvdata->supplies);
|
|
if (ret) {
|
|
dev_err(&pdev->dev,
|
|
"Failed to set initial state: %d\n", ret);
|
|
goto err_enable;
|
|
}
|
|
}
|
|
|
|
drvdata->enabled = pdata->init_on;
|
|
platform_set_drvdata(pdev, drvdata);
|
|
|
|
return 0;
|
|
|
|
err_enable:
|
|
sysfs_remove_group(&pdev->dev.kobj, &attr_group);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int regulator_userspace_consumer_remove(struct platform_device *pdev)
|
|
{
|
|
struct userspace_consumer_data *data = platform_get_drvdata(pdev);
|
|
|
|
sysfs_remove_group(&pdev->dev.kobj, &attr_group);
|
|
|
|
if (data->enabled)
|
|
regulator_bulk_disable(data->num_supplies, data->supplies);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver regulator_userspace_consumer_driver = {
|
|
.probe = regulator_userspace_consumer_probe,
|
|
.remove = regulator_userspace_consumer_remove,
|
|
.driver = {
|
|
.name = "reg-userspace-consumer",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(regulator_userspace_consumer_driver);
|
|
|
|
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
|
|
MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators");
|
|
MODULE_LICENSE("GPL");
|