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