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345 lines
8.2 KiB
345 lines
8.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* reg-virtual-consumer.c |
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* |
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* Copyright 2008 Wolfson Microelectronics PLC. |
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* |
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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/platform_device.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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struct virtual_consumer_data { |
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struct mutex lock; |
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struct regulator *regulator; |
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bool enabled; |
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int min_uV; |
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int max_uV; |
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int min_uA; |
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int max_uA; |
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unsigned int mode; |
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}; |
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static void update_voltage_constraints(struct device *dev, |
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struct virtual_consumer_data *data) |
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{ |
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int ret; |
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if (data->min_uV && data->max_uV |
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&& data->min_uV <= data->max_uV) { |
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dev_dbg(dev, "Requesting %d-%duV\n", |
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data->min_uV, data->max_uV); |
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ret = regulator_set_voltage(data->regulator, |
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data->min_uV, data->max_uV); |
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if (ret != 0) { |
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dev_err(dev, |
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"regulator_set_voltage() failed: %d\n", ret); |
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return; |
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} |
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} |
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if (data->min_uV && data->max_uV && !data->enabled) { |
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dev_dbg(dev, "Enabling regulator\n"); |
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ret = regulator_enable(data->regulator); |
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if (ret == 0) |
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data->enabled = true; |
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else |
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dev_err(dev, "regulator_enable() failed: %d\n", |
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ret); |
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} |
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if (!(data->min_uV && data->max_uV) && data->enabled) { |
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dev_dbg(dev, "Disabling regulator\n"); |
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ret = regulator_disable(data->regulator); |
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if (ret == 0) |
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data->enabled = false; |
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else |
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dev_err(dev, "regulator_disable() failed: %d\n", |
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ret); |
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} |
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} |
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static void update_current_limit_constraints(struct device *dev, |
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struct virtual_consumer_data *data) |
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{ |
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int ret; |
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if (data->max_uA |
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&& data->min_uA <= data->max_uA) { |
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dev_dbg(dev, "Requesting %d-%duA\n", |
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data->min_uA, data->max_uA); |
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ret = regulator_set_current_limit(data->regulator, |
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data->min_uA, data->max_uA); |
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if (ret != 0) { |
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dev_err(dev, |
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"regulator_set_current_limit() failed: %d\n", |
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ret); |
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return; |
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} |
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} |
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if (data->max_uA && !data->enabled) { |
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dev_dbg(dev, "Enabling regulator\n"); |
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ret = regulator_enable(data->regulator); |
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if (ret == 0) |
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data->enabled = true; |
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else |
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dev_err(dev, "regulator_enable() failed: %d\n", |
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ret); |
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} |
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if (!(data->min_uA && data->max_uA) && data->enabled) { |
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dev_dbg(dev, "Disabling regulator\n"); |
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ret = regulator_disable(data->regulator); |
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if (ret == 0) |
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data->enabled = false; |
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else |
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dev_err(dev, "regulator_disable() failed: %d\n", |
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ret); |
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} |
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} |
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static ssize_t show_min_uV(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct virtual_consumer_data *data = dev_get_drvdata(dev); |
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return sprintf(buf, "%d\n", data->min_uV); |
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} |
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static ssize_t set_min_uV(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 virtual_consumer_data *data = dev_get_drvdata(dev); |
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long val; |
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if (kstrtol(buf, 10, &val) != 0) |
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return count; |
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mutex_lock(&data->lock); |
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data->min_uV = val; |
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update_voltage_constraints(dev, data); |
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mutex_unlock(&data->lock); |
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return count; |
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} |
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static ssize_t show_max_uV(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct virtual_consumer_data *data = dev_get_drvdata(dev); |
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return sprintf(buf, "%d\n", data->max_uV); |
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} |
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static ssize_t set_max_uV(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 virtual_consumer_data *data = dev_get_drvdata(dev); |
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long val; |
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if (kstrtol(buf, 10, &val) != 0) |
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return count; |
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mutex_lock(&data->lock); |
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data->max_uV = val; |
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update_voltage_constraints(dev, data); |
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mutex_unlock(&data->lock); |
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return count; |
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} |
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static ssize_t show_min_uA(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct virtual_consumer_data *data = dev_get_drvdata(dev); |
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return sprintf(buf, "%d\n", data->min_uA); |
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} |
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static ssize_t set_min_uA(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 virtual_consumer_data *data = dev_get_drvdata(dev); |
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long val; |
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if (kstrtol(buf, 10, &val) != 0) |
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return count; |
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mutex_lock(&data->lock); |
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data->min_uA = val; |
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update_current_limit_constraints(dev, data); |
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mutex_unlock(&data->lock); |
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return count; |
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} |
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static ssize_t show_max_uA(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct virtual_consumer_data *data = dev_get_drvdata(dev); |
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return sprintf(buf, "%d\n", data->max_uA); |
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} |
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static ssize_t set_max_uA(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 virtual_consumer_data *data = dev_get_drvdata(dev); |
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long val; |
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if (kstrtol(buf, 10, &val) != 0) |
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return count; |
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mutex_lock(&data->lock); |
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data->max_uA = val; |
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update_current_limit_constraints(dev, data); |
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mutex_unlock(&data->lock); |
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return count; |
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} |
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static ssize_t show_mode(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct virtual_consumer_data *data = dev_get_drvdata(dev); |
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switch (data->mode) { |
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case REGULATOR_MODE_FAST: |
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return sprintf(buf, "fast\n"); |
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case REGULATOR_MODE_NORMAL: |
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return sprintf(buf, "normal\n"); |
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case REGULATOR_MODE_IDLE: |
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return sprintf(buf, "idle\n"); |
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case REGULATOR_MODE_STANDBY: |
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return sprintf(buf, "standby\n"); |
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default: |
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return sprintf(buf, "unknown\n"); |
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} |
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} |
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static ssize_t set_mode(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 virtual_consumer_data *data = dev_get_drvdata(dev); |
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unsigned int mode; |
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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_mode(), above. |
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*/ |
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if (sysfs_streq(buf, "fast\n")) |
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mode = REGULATOR_MODE_FAST; |
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else if (sysfs_streq(buf, "normal\n")) |
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mode = REGULATOR_MODE_NORMAL; |
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else if (sysfs_streq(buf, "idle\n")) |
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mode = REGULATOR_MODE_IDLE; |
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else if (sysfs_streq(buf, "standby\n")) |
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mode = REGULATOR_MODE_STANDBY; |
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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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ret = regulator_set_mode(data->regulator, mode); |
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if (ret == 0) |
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data->mode = mode; |
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else |
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dev_err(dev, "Failed to configure mode: %d\n", ret); |
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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(min_microvolts, 0664, show_min_uV, set_min_uV); |
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static DEVICE_ATTR(max_microvolts, 0664, show_max_uV, set_max_uV); |
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static DEVICE_ATTR(min_microamps, 0664, show_min_uA, set_min_uA); |
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static DEVICE_ATTR(max_microamps, 0664, show_max_uA, set_max_uA); |
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static DEVICE_ATTR(mode, 0664, show_mode, set_mode); |
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static struct attribute *regulator_virtual_attributes[] = { |
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&dev_attr_min_microvolts.attr, |
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&dev_attr_max_microvolts.attr, |
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&dev_attr_min_microamps.attr, |
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&dev_attr_max_microamps.attr, |
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&dev_attr_mode.attr, |
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NULL |
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}; |
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static const struct attribute_group regulator_virtual_attr_group = { |
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.attrs = regulator_virtual_attributes, |
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}; |
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static int regulator_virtual_probe(struct platform_device *pdev) |
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{ |
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char *reg_id = dev_get_platdata(&pdev->dev); |
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struct virtual_consumer_data *drvdata; |
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int ret; |
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drvdata = devm_kzalloc(&pdev->dev, sizeof(struct virtual_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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mutex_init(&drvdata->lock); |
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drvdata->regulator = devm_regulator_get(&pdev->dev, reg_id); |
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if (IS_ERR(drvdata->regulator)) { |
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ret = PTR_ERR(drvdata->regulator); |
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dev_err(&pdev->dev, "Failed to obtain supply '%s': %d\n", |
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reg_id, ret); |
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return ret; |
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} |
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ret = sysfs_create_group(&pdev->dev.kobj, |
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®ulator_virtual_attr_group); |
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if (ret != 0) { |
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dev_err(&pdev->dev, |
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"Failed to create attribute group: %d\n", ret); |
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return ret; |
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} |
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drvdata->mode = regulator_get_mode(drvdata->regulator); |
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platform_set_drvdata(pdev, drvdata); |
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return 0; |
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} |
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static int regulator_virtual_remove(struct platform_device *pdev) |
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{ |
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struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev); |
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sysfs_remove_group(&pdev->dev.kobj, ®ulator_virtual_attr_group); |
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if (drvdata->enabled) |
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regulator_disable(drvdata->regulator); |
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return 0; |
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} |
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static struct platform_driver regulator_virtual_consumer_driver = { |
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.probe = regulator_virtual_probe, |
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.remove = regulator_virtual_remove, |
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.driver = { |
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.name = "reg-virt-consumer", |
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}, |
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}; |
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module_platform_driver(regulator_virtual_consumer_driver); |
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MODULE_AUTHOR("Mark Brown <[email protected]>"); |
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MODULE_DESCRIPTION("Virtual regulator consumer"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:reg-virt-consumer");
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