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drivers/regulator/userspace-consumer.c
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81f7e3824 Initial Release, ... |
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/* * 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> * * 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. * */ #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/of.h> #include <linux/regulator/of_regulator.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 reg_show_name(struct device *dev, struct device_attribute *attr, char *buf) { struct userspace_consumer_data *data = dev_get_drvdata(dev); return sprintf(buf, "%s ", data->name); } static ssize_t reg_show_state(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 "); return sprintf(buf, "disabled "); } static ssize_t reg_set_state(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 's, but we add them so the strings * will be shared with show_state(), above. */ if (sysfs_streq(buf, "enabled ") || sysfs_streq(buf, "1")) enabled = true; else if (sysfs_streq(buf, "disabled ") || sysfs_streq(buf, "0")) enabled = false; else { dev_err(dev, "Configuring invalid mode "); 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 ", ret); } mutex_unlock(&data->lock); return count; } static DEVICE_ATTR(name, 0444, reg_show_name, NULL); static DEVICE_ATTR(state, 0644, reg_show_state, reg_set_state); static struct attribute *attributes[] = { &dev_attr_name.attr, &dev_attr_state.attr, NULL, }; static const struct attribute_group attr_group = { .attrs = attributes, }; #if defined(CONFIG_OF) static struct regulator_userspace_consumer_data* of_get_uc_config(struct device *dev, struct device_node *np) { struct regulator_userspace_consumer_data *ucd; int r; ucd = devm_kzalloc(dev, sizeof(struct regulator_userspace_consumer_data) + sizeof(struct regulator_bulk_data), GFP_KERNEL); if (ucd == NULL) return NULL; r = of_property_read_string(np, "uc-name", &ucd->name); if (r) { goto err; } ucd->num_supplies = 1; ucd->supplies = (struct regulator_bulk_data *)&ucd[1]; r = of_property_read_string(np, "suck-supply", &ucd->supplies->supply); if (r) { goto err; } return ucd; err: devm_kfree(dev, ucd); return NULL; } #endif 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 defined(CONFIG_OF) if (!pdata && pdev->dev.of_node) { pdata = of_get_uc_config(&pdev->dev, pdev->dev.of_node); } #endif 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 ", 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 ", ret); goto err_enable; } } drvdata->enabled = pdata->init_on; platform_set_drvdata(pdev, drvdata); dev_info(&pdev->dev, "attached: %s ", drvdata->name); 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; } #if defined(CONFIG_OF) static const struct of_device_id uc_of_match[] = { { .compatible = "userspace_consumer", }, {}, }; #endif static struct platform_driver regulator_userspace_consumer_driver = { .probe = regulator_userspace_consumer_probe, .remove = regulator_userspace_consumer_remove, .driver = { .name = "reg-userspace-consumer", .owner = THIS_MODULE, #if defined(CONFIG_OF) .of_match_table = of_match_ptr(uc_of_match), #endif }, }; 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"); |