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181 lines
4.3 KiB
181 lines
4.3 KiB
// 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 <[email protected]> |
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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 <[email protected]> |
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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 reg_show_name(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 reg_show_state(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 reg_set_state(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(name, 0444, reg_show_name, NULL); |
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static DEVICE_ATTR(state, 0644, reg_show_state, reg_set_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 <[email protected]>"); |
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MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators"); |
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MODULE_LICENSE("GPL");
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