353 lines
8.4 KiB
C
353 lines
8.4 KiB
C
/*
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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 <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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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, 0666, show_min_uV, set_min_uV);
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static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV);
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static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA);
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static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
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static DEVICE_ATTR(mode, 0666, 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 = pdev->dev.platform_data;
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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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platform_set_drvdata(pdev, NULL);
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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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.owner = THIS_MODULE,
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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 <broonie@opensource.wolfsonmicro.com>");
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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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