/* * reg-virtual-consumer.c * * Copyright 2008 Wolfson Microelectronics PLC. * * Author: Mark Brown * * 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 #include #include #include #include #include struct virtual_consumer_data { struct mutex lock; struct regulator *regulator; bool enabled; int min_uV; int max_uV; int min_uA; int max_uA; unsigned int mode; }; static void update_voltage_constraints(struct device *dev, struct virtual_consumer_data *data) { int ret; if (data->min_uV && data->max_uV && data->min_uV <= data->max_uV) { dev_dbg(dev, "Requesting %d-%duV\n", data->min_uV, data->max_uV); ret = regulator_set_voltage(data->regulator, data->min_uV, data->max_uV); if (ret != 0) { dev_err(dev, "regulator_set_voltage() failed: %d\n", ret); return; } } if (data->min_uV && data->max_uV && !data->enabled) { dev_dbg(dev, "Enabling regulator\n"); ret = regulator_enable(data->regulator); if (ret == 0) data->enabled = true; else dev_err(dev, "regulator_enable() failed: %d\n", ret); } if (!(data->min_uV && data->max_uV) && data->enabled) { dev_dbg(dev, "Disabling regulator\n"); ret = regulator_disable(data->regulator); if (ret == 0) data->enabled = false; else dev_err(dev, "regulator_disable() failed: %d\n", ret); } } static void update_current_limit_constraints(struct device *dev, struct virtual_consumer_data *data) { int ret; if (data->max_uA && data->min_uA <= data->max_uA) { dev_dbg(dev, "Requesting %d-%duA\n", data->min_uA, data->max_uA); ret = regulator_set_current_limit(data->regulator, data->min_uA, data->max_uA); if (ret != 0) { dev_err(dev, "regulator_set_current_limit() failed: %d\n", ret); return; } } if (data->max_uA && !data->enabled) { dev_dbg(dev, "Enabling regulator\n"); ret = regulator_enable(data->regulator); if (ret == 0) data->enabled = true; else dev_err(dev, "regulator_enable() failed: %d\n", ret); } if (!(data->min_uA && data->max_uA) && data->enabled) { dev_dbg(dev, "Disabling regulator\n"); ret = regulator_disable(data->regulator); if (ret == 0) data->enabled = false; else dev_err(dev, "regulator_disable() failed: %d\n", ret); } } static ssize_t show_min_uV(struct device *dev, struct device_attribute *attr, char *buf) { struct virtual_consumer_data *data = dev_get_drvdata(dev); return sprintf(buf, "%d\n", data->min_uV); } static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct virtual_consumer_data *data = dev_get_drvdata(dev); long val; if (kstrtol(buf, 10, &val) != 0) return count; mutex_lock(&data->lock); data->min_uV = val; update_voltage_constraints(dev, data); mutex_unlock(&data->lock); return count; } static ssize_t show_max_uV(struct device *dev, struct device_attribute *attr, char *buf) { struct virtual_consumer_data *data = dev_get_drvdata(dev); return sprintf(buf, "%d\n", data->max_uV); } static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct virtual_consumer_data *data = dev_get_drvdata(dev); long val; if (kstrtol(buf, 10, &val) != 0) return count; mutex_lock(&data->lock); data->max_uV = val; update_voltage_constraints(dev, data); mutex_unlock(&data->lock); return count; } static ssize_t show_min_uA(struct device *dev, struct device_attribute *attr, char *buf) { struct virtual_consumer_data *data = dev_get_drvdata(dev); return sprintf(buf, "%d\n", data->min_uA); } static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct virtual_consumer_data *data = dev_get_drvdata(dev); long val; if (kstrtol(buf, 10, &val) != 0) return count; mutex_lock(&data->lock); data->min_uA = val; update_current_limit_constraints(dev, data); mutex_unlock(&data->lock