oleavr-rgl-a500-mini-linux-3.10/drivers/power/axp_power/virtual.h

#ifndef _LINUX_AXP_VIRTUAL_H_
#define _LINUX_AXP_VIRTUAL_H_
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include "axp-core.h"

/*
 * struct regulator
 *
 * One for each consumer device.
 */
struct regulator {
	struct device *dev;
	struct list_head list;
	unsigned int always_on:1;
	unsigned int bypass:1;
	int ua_load;
	int min_uv;
	int max_uv;
	char *supply_name;
	struct device_attribute dev_attr;
	struct regulator_dev *rdev;
	struct dentry *debugfs;
};

struct virtual_consumer_data {
	struct mutex lock;
	int enabled;
	int min_uv;
	int max_uv;
	int min_ua;
	int max_ua;
	char regu_name[16];
};

static void update_voltage_constraints(struct virtual_consumer_data *data)
{
	int ret = 0;
	struct regulator *regu;

	regu = regulator_get(NULL, data->regu_name);
	if (IS_ERR(regu)) {
		pr_err("%s: regulator get %s failed\n",
				__func__, data->regu_name);
		return;
	}

	if (data->min_uv && data->max_uv && data->min_uv <= data->max_uv) {
		ret = regulator_set_voltage(regu, data->min_uv, data->max_uv);
		if (ret != 0) {
			pr_err("regulator_set_voltage() failed: %d\n", ret);
			return;
		}
	}

	if (data->min_uv && data->max_uv) {
		ret = regu->rdev->desc->ops->enable(regu->rdev);
		if (ret != 0)
			pr_err("regulator_enable() failed: %d\n", ret);
	}

	if (!(data->min_uv && data->max_uv)) {
		ret = regu->rdev->desc->ops->disable(regu->rdev);
		if (ret != 0)
			pr_err("regulator_disable() failed: %d\n", ret);
	}

	regulator_put(regu);
}

static void update_current_limit_constraints(struct virtual_consumer_data *data)
{
	int ret;
	struct regulator *regu;

	regu = regulator_get(NULL, data->regu_name);
	if (IS_ERR(regu)) {
		pr_err("%s: regulator get %s failed\n",
				__func__, data->regu_name);
		return;
	}

	if (data->max_ua && data->min_ua <= data->max_ua) {
		ret = regulator_set_current_limit(regu,
				data->min_ua, data->max_ua);
		if (ret != 0) {
			pr_err("regulator_set_current_limit failed\n");
			return;
		}
	}

	if (data->max_ua && !data->enabled) {
		ret = regulator_enable(regu);
		if (ret == 0)
			data->enabled = 1;
		else
			pr_err("regulator_enable() failed: %d\n", ret);
	}

	if (!(data->min_ua && data->max_ua) && data->enabled) {
		ret = regulator_disable(regu);
		if (ret == 0)
			data->enabled = 0;
		else
			pr_err("regulator_disable() failed: %d\n", ret);
	}

	regulator_put(regu);
}

static ssize_t show_min_uv(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	struct regulator *regu;

	regu = regulator_get(NULL, data->regu_name);
	if (IS_ERR(regu))
		return sprintf(buf, "%s: failed\n", __func__);

	data->min_uv = regulator_get_voltage(regu);
	regulator_put(regu);

	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 (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);
	data->min_uv = val;
	update_voltage_constraints(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 (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);
	data->max_uv = val;
	update_voltage_constraints(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 (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);
	data->min_ua = val;
	update_current_limit_constraints(data);
	mutex_unlock(&data->lock);

	return count;
}

static ssize_t show_max_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->max_ua);
}

static ssize_t set_max_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 (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);
	data->max_ua = val;
	update_current_limit_constraints(data);
	mutex_unlock(&data->lock);

	return count;
}

static DEVICE_ATTR(min_microvolts, 0644, show_min_uv, set_min_uv);
static DEVICE_ATTR(max_microvolts, 0644, show_max_uv, set_max_uv);
static DEVICE_ATTR(min_microamps,  0644, show_min_ua, set_min_ua);
static DEVICE_ATTR(max_microamps,  0644, show_max_ua, set_max_ua);

static struct device_attribute *attributes_virtual[] = {
	&dev_attr_min_microvolts,
	&dev_attr_max_microvolts,
	&dev_attr_min_microamps,
	&dev_attr_max_microamps,
};
#endif