273 lines
6.3 KiB
C
Executable File
273 lines
6.3 KiB
C
Executable File
#ifndef _LINUX_AXP_VIRTUAL_H_
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#define _LINUX_AXP_VIRTUAL_H_
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#include <linux/regulator/of_regulator.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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/*
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* struct regulator
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*
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* One for each consumer device.
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*/
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struct regulator {
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struct device *dev;
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struct list_head list;
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unsigned int always_on:1;
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unsigned int bypass:1;
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int uA_load;
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int min_uV;
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int max_uV;
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char *supply_name;
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struct device_attribute dev_attr;
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struct regulator_dev *rdev;
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struct dentry *debugfs;
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};
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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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int 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 virtual_consumer_data *data)
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{
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int ret = 0;
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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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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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printk(KERN_ERR "regulator_set_voltage() 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->min_uV && data->max_uV ) {
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ret = data->regulator->rdev->desc->ops->enable(data->regulator->rdev);
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if (ret != 0)
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printk(KERN_ERR "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)) {
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ret = data->regulator->rdev->desc->ops->disable(data->regulator->rdev);
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if (ret != 0)
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printk(KERN_ERR "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 virtual_consumer_data
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*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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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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pr_err("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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ret = regulator_enable(data->regulator);
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if (ret == 0)
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data->enabled = 1;
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else
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printk(KERN_ERR "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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ret = regulator_disable(data->regulator);
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if (ret == 0)
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data->enabled = 0;
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else
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printk(KERN_ERR "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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data->min_uV = regulator_get_voltage(data->regulator);
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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 (strict_strtol(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(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 (strict_strtol(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 = regulator_get_voltage(data->regulator);
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data->max_uV = val;
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update_voltage_constraints(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 (strict_strtol(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(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 (strict_strtol(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(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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if (strncmp(buf, "fast", strlen("fast")) == 0)
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mode = REGULATOR_MODE_FAST;
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else if (strncmp(buf, "normal", strlen("normal")) == 0)
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mode = REGULATOR_MODE_NORMAL;
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else if (strncmp(buf, "idle", strlen("idle")) == 0)
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mode = REGULATOR_MODE_IDLE;
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else if (strncmp(buf, "standby", strlen("standby")) == 0)
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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, 0644, show_min_uV, set_min_uV);
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static DEVICE_ATTR(max_microvolts, 0644, show_max_uV, set_max_uV);
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static DEVICE_ATTR(min_microamps, 0644, show_min_uA, set_min_uA);
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static DEVICE_ATTR(max_microamps, 0644, show_max_uA, set_max_uA);
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static DEVICE_ATTR(mode, 0644, show_mode, set_mode);
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static struct device_attribute *attributes_virtual[] = {
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&dev_attr_min_microvolts,
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&dev_attr_max_microvolts,
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&dev_attr_min_microamps,
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&dev_attr_max_microamps,
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&dev_attr_mode,
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};
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#endif
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