--- /dev/null
+/*
+ * core.c -- Voltage/Current Regulator framework.
+ *
+ * Copyright 2007, 2008 Wolfson Microelectronics PLC.
+ *
+ * Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
+ *
+ * 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 <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/suspend.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+
+#define REGULATOR_VERSION "0.5"
+
+static DEFINE_MUTEX(regulator_list_mutex);
+static LIST_HEAD(regulator_list);
+static LIST_HEAD(regulator_map_list);
+
+/**
+ * struct regulator_dev
+ *
+ * Voltage / Current regulator class device. One for each regulator.
+ */
+struct regulator_dev {
+ struct regulator_desc *desc;
+ int use_count;
+
+ /* lists we belong to */
+ struct list_head list; /* list of all regulators */
+ struct list_head slist; /* list of supplied regulators */
+
+ /* lists we own */
+ struct list_head consumer_list; /* consumers we supply */
+ struct list_head supply_list; /* regulators we supply */
+
+ struct blocking_notifier_head notifier;
+ struct mutex mutex; /* consumer lock */
+ struct module *owner;
+ struct device dev;
+ struct regulation_constraints *constraints;
+ struct regulator_dev *supply; /* for tree */
+
+ void *reg_data; /* regulator_dev data */
+};
+
+/**
+ * struct regulator_map
+ *
+ * Used to provide symbolic supply names to devices.
+ */
+struct regulator_map {
+ struct list_head list;
+ struct device *dev;
+ const char *supply;
+ const char *regulator;
+};
+
+static inline struct regulator_dev *to_rdev(struct device *d)
+{
+ return container_of(d, struct regulator_dev, dev);
+}
+
+/*
+ * struct regulator
+ *
+ * One for each consumer device.
+ */
+struct regulator {
+ struct device *dev;
+ struct list_head list;
+ int uA_load;
+ int min_uV;
+ int max_uV;
+ int enabled; /* client has called enabled */
+ char *supply_name;
+ struct device_attribute dev_attr;
+ struct regulator_dev *rdev;
+};
+
+static int _regulator_is_enabled(struct regulator_dev *rdev);
+static int _regulator_disable(struct regulator_dev *rdev);
+static int _regulator_get_voltage(struct regulator_dev *rdev);
+static int _regulator_get_current_limit(struct regulator_dev *rdev);
+static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
+static void _notifier_call_chain(struct regulator_dev *rdev,
+ unsigned long event, void *data);
+
+/* gets the regulator for a given consumer device */
+static struct regulator *get_device_regulator(struct device *dev)
+{
+ struct regulator *regulator = NULL;
+ struct regulator_dev *rdev;
+
+ mutex_lock(®ulator_list_mutex);
+ list_for_each_entry(rdev, ®ulator_list, list) {
+ mutex_lock(&rdev->mutex);
+ list_for_each_entry(regulator, &rdev->consumer_list, list) {
+ if (regulator->dev == dev) {
+ mutex_unlock(&rdev->mutex);
+ mutex_unlock(®ulator_list_mutex);
+ return regulator;
+ }
+ }
+ mutex_unlock(&rdev->mutex);
+ }
+ mutex_unlock(®ulator_list_mutex);
+ return NULL;
+}
+
+/* Platform voltage constraint check */
+static int regulator_check_voltage(struct regulator_dev *rdev,
+ int *min_uV, int *max_uV)
+{
+ BUG_ON(*min_uV > *max_uV);
+
+ if (!rdev->constraints) {
+ printk(KERN_ERR "%s: no constraints for %s\n", __func__,
+ rdev->desc->name);
+ return -ENODEV;
+ }
+ if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
+ printk(KERN_ERR "%s: operation not allowed for %s\n",
+ __func__, rdev->desc->name);
+ return -EPERM;
+ }
+
+ if (*max_uV > rdev->constraints->max_uV)
+ *max_uV = rdev->constraints->max_uV;
+ if (*min_uV < rdev->constraints->min_uV)
+ *min_uV = rdev->constraints->min_uV;
+
+ if (*min_uV > *max_uV)
+ return -EINVAL;
+
+ return 0;
+}
+
+/* current constraint check */
+static int regulator_check_current_limit(struct regulator_dev *rdev,
+ int *min_uA, int *max_uA)
+{
+ BUG_ON(*min_uA > *max_uA);
+
+ if (!rdev->constraints) {
+ printk(KERN_ERR "%s: no constraints for %s\n", __func__,
+ rdev->desc->name);
+ return -ENODEV;
+ }
+ if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
+ printk(KERN_ERR "%s: operation not allowed for %s\n",
+ __func__, rdev->desc->name);
+ return -EPERM;
+ }
+
+ if (*max_uA > rdev->constraints->max_uA)
+ *max_uA = rdev->constraints->max_uA;
+ if (*min_uA < rdev->constraints->min_uA)
+ *min_uA = rdev->constraints->min_uA;
+
+ if (*min_uA > *max_uA)
+ return -EINVAL;
+
+ return 0;
+}
+
+/* operating mode constraint check */
+static int regulator_check_mode(struct regulator_dev *rdev, int mode)
+{
+ if (!rdev->constraints) {
+ printk(KERN_ERR "%s: no constraints for %s\n", __func__,
+ rdev->desc->name);
+ return -ENODEV;
+ }
+ if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
+ printk(KERN_ERR "%s: operation not allowed for %s\n",
+ __func__, rdev->desc->name);
+ return -EPERM;
+ }
+ if (!(rdev->constraints->valid_modes_mask & mode)) {
+ printk(KERN_ERR "%s: invalid mode %x for %s\n",
+ __func__, mode, rdev->desc->name);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/* dynamic regulator mode switching constraint check */
+static int regulator_check_drms(struct regulator_dev *rdev)
+{
+ if (!rdev->constraints) {
+ printk(KERN_ERR "%s: no constraints for %s\n", __func__,
+ rdev->desc->name);
+ return -ENODEV;
+ }
+ if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
+ printk(KERN_ERR "%s: operation not allowed for %s\n",
+ __func__, rdev->desc->name);
+ return -EPERM;
+ }
+ return 0;
+}
+
+static ssize_t device_requested_uA_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator *regulator;
+
+ regulator = get_device_regulator(dev);
+ if (regulator == NULL)
+ return 0;
+
+ return sprintf(buf, "%d\n", regulator->uA_load);
+}
+
+static ssize_t regulator_uV_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+ ssize_t ret;
+
+ mutex_lock(&rdev->mutex);
+ ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
+ mutex_unlock(&rdev->mutex);
+
+ return ret;
+}
+
+static ssize_t regulator_uA_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
+}
+
+static ssize_t regulator_opmode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+ int mode = _regulator_get_mode(rdev);
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ return sprintf(buf, "fast\n");
+ case REGULATOR_MODE_NORMAL:
+ return sprintf(buf, "normal\n");
+ case REGULATOR_MODE_IDLE:
+ return sprintf(buf, "idle\n");
+ case REGULATOR_MODE_STANDBY:
+ return sprintf(buf, "standby\n");
+ }
+ return sprintf(buf, "unknown\n");
+}
+
+static ssize_t regulator_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+ int state = _regulator_is_enabled(rdev);
+
+ if (state > 0)
+ return sprintf(buf, "enabled\n");
+ else if (state == 0)
+ return sprintf(buf, "disabled\n");
+ else
+ return sprintf(buf, "unknown\n");
+}
+
+static ssize_t regulator_min_uA_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "constraint not defined\n");
+
+ return sprintf(buf, "%d\n", rdev->constraints->min_uA);
+}
+
+static ssize_t regulator_max_uA_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "constraint not defined\n");
+
+ return sprintf(buf, "%d\n", rdev->constraints->max_uA);
+}
+
+static ssize_t regulator_min_uV_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "constraint not defined\n");
+
+ return sprintf(buf, "%d\n", rdev->constraints->min_uV);
+}
+
+static ssize_t regulator_max_uV_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "constraint not defined\n");
+
+ return sprintf(buf, "%d\n", rdev->constraints->max_uV);
+}
+
+static ssize_t regulator_total_uA_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+ struct regulator *regulator;
+ int uA = 0;
+
+ mutex_lock(&rdev->mutex);
+ list_for_each_entry(regulator, &rdev->consumer_list, list)
+ uA += regulator->uA_load;
+ mutex_unlock(&rdev->mutex);
+ return sprintf(buf, "%d\n", uA);
+}
+
+static ssize_t regulator_num_users_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+ return sprintf(buf, "%d\n", rdev->use_count);
+}
+
+static ssize_t regulator_type_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ switch (rdev->desc->type) {
+ case REGULATOR_VOLTAGE:
+ return sprintf(buf, "voltage\n");
+ case REGULATOR_CURRENT:
+ return sprintf(buf, "current\n");
+ }
+ return sprintf(buf, "unknown\n");
+}
+
+static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "not defined\n");
+ return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
+}
+
+static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "not defined\n");
+ return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
+}
+
+static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "not defined\n");
+ return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
+}
+
+static ssize_t suspend_opmode_show(struct regulator_dev *rdev,
+ unsigned int mode, char *buf)
+{
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ return sprintf(buf, "fast\n");
+ case REGULATOR_MODE_NORMAL:
+ return sprintf(buf, "normal\n");
+ case REGULATOR_MODE_IDLE:
+ return sprintf(buf, "idle\n");
+ case REGULATOR_MODE_STANDBY:
+ return sprintf(buf, "standby\n");
+ }
+ return sprintf(buf, "unknown\n");
+}
+
+static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "not defined\n");
+ return suspend_opmode_show(rdev,
+ rdev->constraints->state_mem.mode, buf);
+}
+
+static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "not defined\n");
+ return suspend_opmode_show(rdev,
+ rdev->constraints->state_disk.mode, buf);
+}
+
+static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "not defined\n");
+ return suspend_opmode_show(rdev,
+ rdev->constraints->state_standby.mode, buf);
+}
+
+static ssize_t regulator_suspend_mem_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "not defined\n");
+
+ if (rdev->constraints->state_mem.enabled)
+ return sprintf(buf, "enabled\n");
+ else
+ return sprintf(buf, "disabled\n");
+}
+
+static ssize_t regulator_suspend_disk_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "not defined\n");
+
+ if (rdev->constraints->state_disk.enabled)
+ return sprintf(buf, "enabled\n");
+ else
+ return sprintf(buf, "disabled\n");
+}
+
+static ssize_t regulator_suspend_standby_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+
+ if (!rdev->constraints)
+ return sprintf(buf, "not defined\n");
+
+ if (rdev->constraints->state_standby.enabled)
+ return sprintf(buf, "enabled\n");
+ else
+ return sprintf(buf, "disabled\n");
+}
+static struct device_attribute regulator_dev_attrs[] = {
+ __ATTR(microvolts, 0444, regulator_uV_show, NULL),
+ __ATTR(microamps, 0444, regulator_uA_show, NULL),
+ __ATTR(opmode, 0444, regulator_opmode_show, NULL),
+ __ATTR(state, 0444, regulator_state_show, NULL),
+ __ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL),
+ __ATTR(min_microamps, 0444, regulator_min_uA_show, NULL),
+ __ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL),
+ __ATTR(max_microamps, 0444, regulator_max_uA_show, NULL),
+ __ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL),
+ __ATTR(num_users, 0444, regulator_num_users_show, NULL),
+ __ATTR(type, 0444, regulator_type_show, NULL),
+ __ATTR(suspend_mem_microvolts, 0444,
+ regulator_suspend_mem_uV_show, NULL),
+ __ATTR(suspend_disk_microvolts, 0444,
+ regulator_suspend_disk_uV_show, NULL),
+ __ATTR(suspend_standby_microvolts, 0444,
+ regulator_suspend_standby_uV_show, NULL),
+ __ATTR(suspend_mem_mode, 0444,
+ regulator_suspend_mem_mode_show, NULL),
+ __ATTR(suspend_disk_mode, 0444,
+ regulator_suspend_disk_mode_show, NULL),
+ __ATTR(suspend_standby_mode, 0444,
+ regulator_suspend_standby_mode_show, NULL),
+ __ATTR(suspend_mem_state, 0444,
+ regulator_suspend_mem_state_show, NULL),
+ __ATTR(suspend_disk_state, 0444,
+ regulator_suspend_disk_state_show, NULL),
+ __ATTR(suspend_standby_state, 0444,
+ regulator_suspend_standby_state_show, NULL),
+ __ATTR_NULL,
+};
+
+static void regulator_dev_release(struct device *dev)
+{
+ struct regulator_dev *rdev = to_rdev(dev);
+ kfree(rdev);
+}
+
+static struct class regulator_class = {
+ .name = "regulator",
+ .dev_release = regulator_dev_release,
+ .dev_attrs = regulator_dev_attrs,
+};
+
+/* Calculate the new optimum regulator operating mode based on the new total
+ * consumer load. All locks held by caller */
+static void drms_uA_update(struct regulator_dev *rdev)
+{
+ struct regulator *sibling;
+ int current_uA = 0, output_uV, input_uV, err;
+ unsigned int mode;
+
+ err = regulator_check_drms(rdev);
+ if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
+ !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode);
+ return;
+
+ /* get output voltage */
+ output_uV = rdev->desc->ops->get_voltage(rdev);
+ if (output_uV <= 0)
+ return;
+
+ /* get input voltage */
+ if (rdev->supply && rdev->supply->desc->ops->get_voltage)
+ input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
+ else
+ input_uV = rdev->constraints->input_uV;
+ if (input_uV <= 0)
+ return;
+
+ /* calc total requested load */
+ list_for_each_entry(sibling, &rdev->consumer_list, list)
+ current_uA += sibling->uA_load;
+
+ /* now get the optimum mode for our new total regulator load */
+ mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
+ output_uV, current_uA);
+
+ /* check the new mode is allowed */
+ err = regulator_check_mode(rdev, mode);
+ if (err == 0)
+ rdev->desc->ops->set_mode(rdev, mode);
+}
+
+static int suspend_set_state(struct regulator_dev *rdev,
+ struct regulator_state *rstate)
+{
+ int ret = 0;
+
+ /* enable & disable are mandatory for suspend control */
+ if (!rdev->desc->ops->set_suspend_enable ||
+ !rdev->desc->ops->set_suspend_disable)
+ return -EINVAL;
+
+ if (rstate->enabled)
+ ret = rdev->desc->ops->set_suspend_enable(rdev);
+ else
+ ret = rdev->desc->ops->set_suspend_disable(rdev);
+ if (ret < 0) {
+ printk(KERN_ERR "%s: failed to enabled/disable\n", __func__);
+ return ret;
+ }
+
+ if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
+ ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
+ if (ret < 0) {
+ printk(KERN_ERR "%s: failed to set voltage\n",
+ __func__);
+ return ret;
+ }
+ }
+
+ if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
+ ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
+ if (ret < 0) {
+ printk(KERN_ERR "%s: failed to set mode\n", __func__);
+ return ret;
+ }
+ }
+ return ret;
+}
+
+/* locks held by caller */
+static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
+{
+ if (!rdev->constraints)
+ return -EINVAL;
+
+ switch (state) {
+ case PM_SUSPEND_STANDBY:
+ return suspend_set_state(rdev,
+ &rdev->constraints->state_standby);
+ case PM_SUSPEND_MEM:
+ return suspend_set_state(rdev,
+ &rdev->constraints->state_mem);
+ case PM_SUSPEND_MAX:
+ return suspend_set_state(rdev,
+ &rdev->constraints->state_disk);
+ default:
+ return -EINVAL;
+ }
+}
+
+static void print_constraints(struct regulator_dev *rdev)
+{
+ struct regulation_constraints *constraints = rdev->constraints;
+ char buf[80];
+ int count;
+
+ if (rdev->desc->type == REGULATOR_VOLTAGE) {
+ if (constraints->min_uV == constraints->max_uV)
+ count = sprintf(buf, "%d mV ",
+ constraints->min_uV / 1000);
+ else
+ count = sprintf(buf, "%d <--> %d mV ",
+ constraints->min_uV / 1000,
+ constraints->max_uV / 1000);
+ } else {
+ if (constraints->min_uA == constraints->max_uA)
+ count = sprintf(buf, "%d mA ",
+ constraints->min_uA / 1000);
+ else
+ count = sprintf(buf, "%d <--> %d mA ",
+ constraints->min_uA / 1000,
+ constraints->max_uA / 1000);
+ }
+ if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
+ count += sprintf(buf + count, "fast ");
+ if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
+ count += sprintf(buf + count, "normal ");
+ if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
+ count += sprintf(buf + count, "idle ");
+ if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
+ count += sprintf(buf + count, "standby");
+
+ printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf);
+}
+
+#define REG_STR_SIZE 32
+
+static struct regulator *create_regulator(struct regulator_dev *rdev,
+ struct device *dev,
+ const char *supply_name)
+{
+ struct regulator *regulator;
+ char buf[REG_STR_SIZE];
+ int err, size;
+
+ regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
+ if (regulator == NULL)
+ return NULL;
+
+ mutex_lock(&rdev->mutex);
+ regulator->rdev = rdev;
+ list_add(®ulator->list, &rdev->consumer_list);
+
+ if (dev) {
+ /* create a 'requested_microamps_name' sysfs entry */
+ size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
+ supply_name);
+ if (size >= REG_STR_SIZE)
+ goto overflow_err;
+
+ regulator->dev = dev;
+ regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
+ if (regulator->dev_attr.attr.name == NULL)
+ goto attr_name_err;
+
+ regulator->dev_attr.attr.owner = THIS_MODULE;
+ regulator->dev_attr.attr.mode = 0444;
+ regulator->dev_attr.show = device_requested_uA_show;
+ err = device_create_file(dev, ®ulator->dev_attr);
+ if (err < 0) {
+ printk(KERN_WARNING "%s: could not add regulator_dev"
+ " load sysfs\n", __func__);
+ goto attr_name_err;
+ }
+
+ /* also add a link to the device sysfs entry */
+ size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
+ dev->kobj.name, supply_name);
+ if (size >= REG_STR_SIZE)
+ goto attr_err;
+
+ regulator->supply_name = kstrdup(buf, GFP_KERNEL);
+ if (regulator->supply_name == NULL)
+ goto attr_err;
+
+ err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
+ buf);
+ if (err) {
+ printk(KERN_WARNING
+ "%s: could not add device link %s err %d\n",
+ __func__, dev->kobj.name, err);
+ device_remove_file(dev, ®ulator->dev_attr);
+ goto link_name_err;
+ }
+ }
+ mutex_unlock(&rdev->mutex);
+ return regulator;
+link_name_err:
+ kfree(regulator->supply_name);
+attr_err:
+ device_remove_file(regulator->dev, ®ulator->dev_attr);
+attr_name_err:
+ kfree(regulator->dev_attr.attr.name);
+overflow_err:
+ list_del(®ulator->list);
+ kfree(regulator);
+ mutex_unlock(&rdev->mutex);
+ return NULL;
+}
+
+/**
+ * regulator_get - lookup and obtain a reference to a regulator.
+ * @dev: device for regulator "consumer"
+ * @id: Supply name or regulator ID.
+ *
+ * Returns a struct regulator corresponding to the regulator producer,
+ * or IS_ERR() condition containing errno. Use of supply names
+ * configured via regulator_set_device_supply() is strongly
+ * encouraged.
+ */
+struct regulator *regulator_get(struct device *dev, const char *id)
+{
+ struct regulator_dev *rdev;
+ struct regulator_map *map;
+ struct regulator *regulator = ERR_PTR(-ENODEV);
+ const char *supply = id;
+
+ if (id == NULL) {
+ printk(KERN_ERR "regulator: get() with no identifier\n");
+ return regulator;
+ }
+
+ mutex_lock(®ulator_list_mutex);
+
+ list_for_each_entry(map, ®ulator_map_list, list) {
+ if (dev == map->dev &&
+ strcmp(map->supply, id) == 0) {
+ supply = map->regulator;
+ break;
+ }
+ }
+
+ list_for_each_entry(rdev, ®ulator_list, list) {
+ if (strcmp(supply, rdev->desc->name) == 0 &&
+ try_module_get(rdev->owner))
+ goto found;
+ }
+ printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n",
+ id);
+ mutex_unlock(®ulator_list_mutex);
+ return regulator;
+
+found:
+ regulator = create_regulator(rdev, dev, id);
+ if (regulator == NULL) {
+ regulator = ERR_PTR(-ENOMEM);
+ module_put(rdev->owner);
+ }
+
+ mutex_unlock(®ulator_list_mutex);
+ return regulator;
+}
+EXPORT_SYMBOL_GPL(regulator_get);
+
+/**
+ * regulator_put - "free" the regulator source
+ * @regulator: regulator source
+ *
+ * Note: drivers must ensure that all regulator_enable calls made on this
+ * regulator source are balanced by regulator_disable calls prior to calling
+ * this function.
+ */
+void regulator_put(struct regulator *regulator)
+{
+ struct regulator_dev *rdev;
+
+ if (regulator == NULL || IS_ERR(regulator))
+ return;
+
+ if (regulator->enabled) {
+ printk(KERN_WARNING "Releasing supply %s while enabled\n",
+ regulator->supply_name);
+ WARN_ON(regulator->enabled);
+ regulator_disable(regulator);
+ }
+
+ mutex_lock(®ulator_list_mutex);
+ rdev = regulator->rdev;
+
+ /* remove any sysfs entries */
+ if (regulator->dev) {
+ sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
+ kfree(regulator->supply_name);
+ device_remove_file(regulator->dev, ®ulator->dev_attr);
+ kfree(regulator->dev_attr.attr.name);
+ }
+ list_del(®ulator->list);
+ kfree(regulator);
+
+ module_put(rdev->owner);
+ mutex_unlock(®ulator_list_mutex);
+}
+EXPORT_SYMBOL_GPL(regulator_put);
+
+/* locks held by regulator_enable() */
+static int _regulator_enable(struct regulator_dev *rdev)
+{
+ int ret = -EINVAL;
+
+ if (!rdev->constraints) {
+ printk(KERN_ERR "%s: %s has no constraints\n",
+ __func__, rdev->desc->name);
+ return ret;
+ }
+
+ /* do we need to enable the supply regulator first */
+ if (rdev->supply) {
+ ret = _regulator_enable(rdev->supply);
+ if (ret < 0) {
+ printk(KERN_ERR "%s: failed to enable %s: %d\n",
+ __func__, rdev->desc->name, ret);
+ return ret;
+ }
+ }
+
+ /* check voltage and requested load before enabling */
+ if (rdev->desc->ops->enable) {
+
+ if (rdev->constraints &&
+ (rdev->constraints->valid_ops_mask &
+ REGULATOR_CHANGE_DRMS))
+ drms_uA_update(rdev);
+
+ ret = rdev->desc->ops->enable(rdev);
+ if (ret < 0) {
+ printk(KERN_ERR "%s: failed to enable %s: %d\n",
+ __func__, rdev->desc->name, ret);
+ return ret;
+ }
+ rdev->use_count++;
+ return ret;
+ }
+
+ return ret;
+}
+
+/**
+ * regulator_enable - enable regulator output
+ * @regulator: regulator source
+ *
+ * Enable the regulator output at the predefined voltage or current value.
+ * NOTE: the output value can be set by other drivers, boot loader or may be
+ * hardwired in the regulator.
+ * NOTE: calls to regulator_enable() must be balanced with calls to
+ * regulator_disable().
+ */
+int regulator_enable(struct regulator *regulator)
+{
+ int ret;
+
+ if (regulator->enabled) {
+ printk(KERN_CRIT "Regulator %s already enabled\n",
+ regulator->supply_name);
+ WARN_ON(regulator->enabled);
+ return 0;
+ }
+
+ mutex_lock(®ulator->rdev->mutex);
+ regulator->enabled = 1;
+ ret = _regulator_enable(regulator->rdev);
+ if (ret != 0)
+ regulator->enabled = 0;
+ mutex_unlock(®ulator->rdev->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_enable);
+
+/* locks held by regulator_disable() */
+static int _regulator_disable(struct regulator_dev *rdev)
+{
+ int ret = 0;
+
+ /* are we the last user and permitted to disable ? */
+ if (rdev->use_count == 1 && !rdev->constraints->always_on) {
+
+ /* we are last user */
+ if (rdev->desc->ops->disable) {
+ ret = rdev->desc->ops->disable(rdev);
+ if (ret < 0) {
+ printk(KERN_ERR "%s: failed to disable %s\n",
+ __func__, rdev->desc->name);
+ return ret;
+ }
+ }
+
+ /* decrease our supplies ref count and disable if required */
+ if (rdev->supply)
+ _regulator_disable(rdev->supply);
+
+ rdev->use_count = 0;
+ } else if (rdev->use_count > 1) {
+
+ if (rdev->constraints &&
+ (rdev->constraints->valid_ops_mask &
+ REGULATOR_CHANGE_DRMS))
+ drms_uA_update(rdev);
+
+ rdev->use_count--;
+ }
+ return ret;
+}
+
+/**
+ * regulator_disable - disable regulator output
+ * @regulator: regulator source
+ *
+ * Disable the regulator output voltage or current.
+ * NOTE: this will only disable the regulator output if no other consumer
+ * devices have it enabled.
+ * NOTE: calls to regulator_enable() must be balanced with calls to
+ * regulator_disable().
+ */
+int regulator_disable(struct regulator *regulator)
+{
+ int ret;
+
+ if (!regulator->enabled) {
+ printk(KERN_ERR "%s: not in use by this consumer\n",
+ __func__);
+ return 0;
+ }
+
+ mutex_lock(®ulator->rdev->mutex);
+ regulator->enabled = 0;
+ regulator->uA_load = 0;
+ ret = _regulator_disable(regulator->rdev);
+ mutex_unlock(®ulator->rdev->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_disable);
+
+/* locks held by regulator_force_disable() */
+static int _regulator_force_disable(struct regulator_dev *rdev)
+{
+ int ret = 0;
+
+ /* force disable */
+ if (rdev->desc->ops->disable) {
+ /* ah well, who wants to live forever... */
+ ret = rdev->desc->ops->disable(rdev);
+ if (ret < 0) {
+ printk(KERN_ERR "%s: failed to force disable %s\n",
+ __func__, rdev->desc->name);
+ return ret;
+ }
+ /* notify other consumers that power has been forced off */
+ _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE,
+ NULL);
+ }
+
+ /* decrease our supplies ref count and disable if required */
+ if (rdev->supply)
+ _regulator_disable(rdev->supply);
+
+ rdev->use_count = 0;
+ return ret;
+}
+
+/**
+ * regulator_force_disable - force disable regulator output
+ * @regulator: regulator source
+ *
+ * Forcibly disable the regulator output voltage or current.
+ * NOTE: this *will* disable the regulator output even if other consumer
+ * devices have it enabled. This should be used for situations when device
+ * damage will likely occur if the regulator is not disabled (e.g. over temp).
+ */
+int regulator_force_disable(struct regulator *regulator)
+{
+ int ret;
+
+ mutex_lock(®ulator->rdev->mutex);
+ regulator->enabled = 0;
+ regulator->uA_load = 0;
+ ret = _regulator_force_disable(regulator->rdev);
+ mutex_unlock(®ulator->rdev->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_force_disable);
+
+static int _regulator_is_enabled(struct regulator_dev *rdev)
+{
+ int ret;
+
+ mutex_lock(&rdev->mutex);
+
+ /* sanity check */
+ if (!rdev->desc->ops->is_enabled) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = rdev->desc->ops->is_enabled(rdev);
+out:
+ mutex_unlock(&rdev->mutex);
+ return ret;
+}
+
+/**
+ * regulator_is_enabled - is the regulator output enabled
+ * @regulator: regulator source
+ *
+ * Returns zero for disabled otherwise return number of enable requests.
+ */
+int regulator_is_enabled(struct regulator *regulator)
+{
+ return _regulator_is_enabled(regulator->rdev);
+}
+EXPORT_SYMBOL_GPL(regulator_is_enabled);
+
+/**
+ * regulator_set_voltage - set regulator output voltage
+ * @regulator: regulator source
+ * @min_uV: Minimum required voltage in uV
+ * @max_uV: Maximum acceptable voltage in uV
+ *
+ * Sets a voltage regulator to the desired output voltage. This can be set
+ * during any regulator state. IOW, regulator can be disabled or enabled.
+ *
+ * If the regulator is enabled then the voltage will change to the new value
+ * immediately otherwise if the regulator is disabled the regulator will
+ * output at the new voltage when enabled.
+ *
+ * NOTE: If the regulator is shared between several devices then the lowest
+ * request voltage that meets the system constraints will be used.
+ * NOTE: Regulator system constraints must be set for this regulator before
+ * calling this function otherwise this call will fail.
+ */
+int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
+{
+ struct regulator_dev *rdev = regulator->rdev;
+ int ret;
+
+ mutex_lock(&rdev->mutex);
+
+ /* sanity check */
+ if (!rdev->desc->ops->set_voltage) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* constraints check */
+ ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
+ if (ret < 0)
+ goto out;
+ regulator->min_uV = min_uV;
+ regulator->max_uV = max_uV;
+ ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
+
+out:
+ mutex_unlock(&rdev->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_set_voltage);
+
+static int _regulator_get_voltage(struct regulator_dev *rdev)
+{
+ /* sanity check */
+ if (rdev->desc->ops->get_voltage)
+ return rdev->desc->ops->get_voltage(rdev);
+ else
+ return -EINVAL;
+}
+
+/**
+ * regulator_get_voltage - get regulator output voltage
+ * @regulator: regulator source
+ *
+ * This returns the current regulator voltage in uV.
+ *
+ * NOTE: If the regulator is disabled it will return the voltage value. This
+ * function should not be used to determine regulator state.
+ */
+int regulator_get_voltage(struct regulator *regulator)
+{
+ int ret;
+
+ mutex_lock(®ulator->rdev->mutex);
+
+ ret = _regulator_get_voltage(regulator->rdev);
+
+ mutex_unlock(®ulator->rdev->mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_get_voltage);
+
+/**
+ * regulator_set_current_limit - set regulator output current limit
+ * @regulator: regulator source
+ * @min_uA: Minimuum supported current in uA
+ * @max_uA: Maximum supported current in uA
+ *
+ * Sets current sink to the desired output current. This can be set during
+ * any regulator state. IOW, regulator can be disabled or enabled.
+ *
+ * If the regulator is enabled then the current will change to the new value
+ * immediately otherwise if the regulator is disabled the regulator will
+ * output at the new current when enabled.
+ *
+ * NOTE: Regulator system constraints must be set for this regulator before
+ * calling this function otherwise this call will fail.
+ */
+int regulator_set_current_limit(struct regulator *regulator,
+ int min_uA, int max_uA)
+{
+ struct regulator_dev *rdev = regulator->rdev;
+ int ret;
+
+ mutex_lock(&rdev->mutex);
+
+ /* sanity check */
+ if (!rdev->desc->ops->set_current_limit) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* constraints check */
+ ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
+ if (ret < 0)
+ goto out;
+
+ ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
+out:
+ mutex_unlock(&rdev->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_set_current_limit);
+
+static int _regulator_get_current_limit(struct regulator_dev *rdev)
+{
+ int ret;
+
+ mutex_lock(&rdev->mutex);
+
+ /* sanity check */
+ if (!rdev->desc->ops->get_current_limit) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = rdev->desc->ops->get_current_limit(rdev);
+out:
+ mutex_unlock(&rdev->mutex);
+ return ret;
+}
+
+/**
+ * regulator_get_current_limit - get regulator output current
+ * @regulator: regulator source
+ *
+ * This returns the current supplied by the specified current sink in uA.
+ *
+ * NOTE: If the regulator is disabled it will return the current value. This
+ * function should not be used to determine regulator state.
+ */
+int regulator_get_current_limit(struct regulator *regulator)
+{
+ return _regulator_get_current_limit(regulator->rdev);
+}
+EXPORT_SYMBOL_GPL(regulator_get_current_limit);
+
+/**
+ * regulator_set_mode - set regulator operating mode
+ * @regulator: regulator source
+ * @mode: operating mode - one of the REGULATOR_MODE constants
+ *
+ * Set regulator operating mode to increase regulator efficiency or improve
+ * regulation performance.
+ *
+ * NOTE: Regulator system constraints must be set for this regulator before
+ * calling this function otherwise this call will fail.
+ */
+int regulator_set_mode(struct regulator *regulator, unsigned int mode)
+{
+ struct regulator_dev *rdev = regulator->rdev;
+ int ret;
+
+ mutex_lock(&rdev->mutex);
+
+ /* sanity check */
+ if (!rdev->desc->ops->set_mode) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* constraints check */
+ ret = regulator_check_mode(rdev, mode);
+ if (ret < 0)
+ goto out;
+
+ ret = rdev->desc->ops->set_mode(rdev, mode);
+out:
+ mutex_unlock(&rdev->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_set_mode);
+
+static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
+{
+ int ret;
+
+ mutex_lock(&rdev->mutex);
+
+ /* sanity check */
+ if (!rdev->desc->ops->get_mode) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = rdev->desc->ops->get_mode(rdev);
+out:
+ mutex_unlock(&rdev->mutex);
+ return ret;
+}
+
+/**
+ * regulator_get_mode - get regulator operating mode
+ * @regulator: regulator source
+ *
+ * Get the current regulator operating mode.
+ */
+unsigned int regulator_get_mode(struct regulator *regulator)
+{
+ return _regulator_get_mode(regulator->rdev);
+}
+EXPORT_SYMBOL_GPL(regulator_get_mode);
+
+/**
+ * regulator_set_optimum_mode - set regulator optimum operating mode
+ * @regulator: regulator source
+ * @uA_load: load current
+ *
+ * Notifies the regulator core of a new device load. This is then used by
+ * DRMS (if enabled by constraints) to set the most efficient regulator
+ * operating mode for the new regulator loading.
+ *
+ * Consumer devices notify their supply regulator of the maximum power
+ * they will require (can be taken from device datasheet in the power
+ * consumption tables) when they change operational status and hence power
+ * state. Examples of operational state changes that can affect power
+ * consumption are :-
+ *
+ * o Device is opened / closed.
+ * o Device I/O is about to begin or has just finished.
+ * o Device is idling in between work.
+ *
+ * This information is also exported via sysfs to userspace.
+ *
+ * DRMS will sum the total requested load on the regulator and change
+ * to the most efficient operating mode if platform constraints allow.
+ *
+ * Returns the new regulator mode or error.
+ */
+int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
+{
+ struct regulator_dev *rdev = regulator->rdev;
+ struct regulator *consumer;
+ int ret, output_uV, input_uV, total_uA_load = 0;
+ unsigned int mode;
+
+ mutex_lock(&rdev->mutex);
+
+ regulator->uA_load = uA_load;
+ ret = regulator_check_drms(rdev);
+ if (ret < 0)
+ goto out;
+ ret = -EINVAL;
+
+ /* sanity check */
+ if (!rdev->desc->ops->get_optimum_mode)
+ goto out;
+
+ /* get output voltage */
+ output_uV = rdev->desc->ops->get_voltage(rdev);
+ if (output_uV <= 0) {
+ printk(KERN_ERR "%s: invalid output voltage found for %s\n",
+ __func__, rdev->desc->name);
+ goto out;
+ }
+
+ /* get input voltage */
+ if (rdev->supply && rdev->supply->desc->ops->get_voltage)
+ input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
+ else
+ input_uV = rdev->constraints->input_uV;
+ if (input_uV <= 0) {
+ printk(KERN_ERR "%s: invalid input voltage found for %s\n",
+ __func__, rdev->desc->name);
+ goto out;
+ }
+
+ /* calc total requested load for this regulator */
+ list_for_each_entry(consumer, &rdev->consumer_list, list)
+ total_uA_load += consumer->uA_load;
+
+ mode = rdev->desc->ops->get_optimum_mode(rdev,
+ input_uV, output_uV,
+ total_uA_load);
+ if (ret <= 0) {
+ printk(KERN_ERR "%s: failed to get optimum mode for %s @"
+ " %d uA %d -> %d uV\n", __func__, rdev->desc->name,
+ total_uA_load, input_uV, output_uV);
+ goto out;
+ }
+
+ ret = rdev->desc->ops->set_mode(rdev, mode);
+ if (ret <= 0) {
+ printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
+ __func__, mode, rdev->desc->name);
+ goto out;
+ }
+ ret = mode;
+out:
+ mutex_unlock(&rdev->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
+
+/**
+ * regulator_register_notifier - register regulator event notifier
+ * @regulator: regulator source
+ * @notifier_block: notifier block
+ *
+ * Register notifier block to receive regulator events.
+ */
+int regulator_register_notifier(struct regulator *regulator,
+ struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(®ulator->rdev->notifier,
+ nb);
+}
+EXPORT_SYMBOL_GPL(regulator_register_notifier);
+
+/**
+ * regulator_unregister_notifier - unregister regulator event notifier
+ * @regulator: regulator source
+ * @notifier_block: notifier block
+ *
+ * Unregister regulator event notifier block.
+ */
+int regulator_unregister_notifier(struct regulator *regulator,
+ struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
+ nb);
+}
+EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
+
+/* notify regulator consumers and downstream regulator consumers */
+static void _notifier_call_chain(struct regulator_dev *rdev,
+ unsigned long event, void *data)
+{
+ struct regulator_dev *_rdev;
+
+ /* call rdev chain first */
+ mutex_lock(&rdev->mutex);
+ blocking_notifier_call_chain(&rdev->notifier, event, NULL);
+ mutex_unlock(&rdev->mutex);
+
+ /* now notify regulator we supply */
+ list_for_each_entry(_rdev, &rdev->supply_list, slist)
+ _notifier_call_chain(_rdev, event, data);
+}
+
+/**
+ * regulator_bulk_get - get multiple regulator consumers
+ *
+ * @dev: Device to supply
+ * @num_consumers: Number of consumers to register
+ * @consumers: Configuration of consumers; clients are stored here.
+ *
+ * @return 0 on success, an errno on failure.
+ *
+ * This helper function allows drivers to get several regulator
+ * consumers in one operation. If any of the regulators cannot be
+ * acquired then any regulators that were allocated will be freed
+ * before returning to the caller.
+ */
+int regulator_bulk_get(struct device *dev, int num_consumers,
+ struct regulator_bulk_data *consumers)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < num_consumers; i++)
+ consumers[i].consumer = NULL;
+
+ for (i = 0; i < num_consumers; i++) {
+ consumers[i].consumer = regulator_get(dev,
+ consumers[i].supply);
+ if (IS_ERR(consumers[i].consumer)) {
+ dev_err(dev, "Failed to get supply '%s'\n",
+ consumers[i].supply);
+ ret = PTR_ERR(consumers[i].consumer);
+ consumers[i].consumer = NULL;
+ goto err;
+ }
+ }
+
+ return 0;
+
+err:
+ for (i = 0; i < num_consumers && consumers[i].consumer; i++)
+ regulator_put(consumers[i].consumer);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_bulk_get);
+
+/**
+ * regulator_bulk_enable - enable multiple regulator consumers
+ *
+ * @num_consumers: Number of consumers
+ * @consumers: Consumer data; clients are stored here.
+ * @return 0 on success, an errno on failure
+ *
+ * This convenience API allows consumers to enable multiple regulator
+ * clients in a single API call. If any consumers cannot be enabled
+ * then any others that were enabled will be disabled again prior to
+ * return.
+ */
+int regulator_bulk_enable(int num_consumers,
+ struct regulator_bulk_data *consumers)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < num_consumers; i++) {
+ ret = regulator_enable(consumers[i].consumer);
+ if (ret != 0)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply);
+ for (i = 0; i < num_consumers; i++)
+ regulator_disable(consumers[i].consumer);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_bulk_enable);
+
+/**
+ * regulator_bulk_disable - disable multiple regulator consumers
+ *
+ * @num_consumers: Number of consumers
+ * @consumers: Consumer data; clients are stored here.
+ * @return 0 on success, an errno on failure
+ *
+ * This convenience API allows consumers to disable multiple regulator
+ * clients in a single API call. If any consumers cannot be enabled
+ * then any others that were disabled will be disabled again prior to
+ * return.
+ */
+int regulator_bulk_disable(int num_consumers,
+ struct regulator_bulk_data *consumers)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < num_consumers; i++) {
+ ret = regulator_disable(consumers[i].consumer);
+ if (ret != 0)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply);
+ for (i = 0; i < num_consumers; i++)
+ regulator_enable(consumers[i].consumer);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_bulk_disable);
+
+/**
+ * regulator_bulk_free - free multiple regulator consumers
+ *
+ * @num_consumers: Number of consumers
+ * @consumers: Consumer data; clients are stored here.
+ *
+ * This convenience API allows consumers to free multiple regulator
+ * clients in a single API call.
+ */
+void regulator_bulk_free(int num_consumers,
+ struct regulator_bulk_data *consumers)
+{
+ int i;
+
+ for (i = 0; i < num_consumers; i++) {
+ regulator_put(consumers[i].consumer);
+ consumers[i].consumer = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(regulator_bulk_free);
+
+/**
+ * regulator_notifier_call_chain - call regulator event notifier
+ * @regulator: regulator source
+ * @event: notifier block
+ * @data:
+ *
+ * Called by regulator drivers to notify clients a regulator event has
+ * occurred. We also notify regulator clients downstream.
+ */
+int regulator_notifier_call_chain(struct regulator_dev *rdev,
+ unsigned long event, void *data)
+{
+ _notifier_call_chain(rdev, event, data);
+ return NOTIFY_DONE;
+
+}
+EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
+
+/**
+ * regulator_register - register regulator
+ * @regulator: regulator source
+ * @reg_data: private regulator data
+ *
+ * Called by regulator drivers to register a regulator.
+ * Returns 0 on success.
+ */
+struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
+ void *reg_data)
+{
+ static atomic_t regulator_no = ATOMIC_INIT(0);
+ struct regulator_dev *rdev;
+ int ret;
+
+ if (regulator_desc == NULL)
+ return ERR_PTR(-EINVAL);
+
+ if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
+ return ERR_PTR(-EINVAL);
+
+ if (!regulator_desc->type == REGULATOR_VOLTAGE &&
+ !regulator_desc->type == REGULATOR_CURRENT)
+ return ERR_PTR(-EINVAL);
+
+ rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
+ if (rdev == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_lock(®ulator_list_mutex);
+
+ mutex_init(&rdev->mutex);
+ rdev->reg_data = reg_data;
+ rdev->owner = regulator_desc->owner;
+ rdev->desc = regulator_desc;
+ INIT_LIST_HEAD(&rdev->consumer_list);
+ INIT_LIST_HEAD(&rdev->supply_list);
+ INIT_LIST_HEAD(&rdev->list);
+ INIT_LIST_HEAD(&rdev->slist);
+ BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
+
+ rdev->dev.class = ®ulator_class;
+ device_initialize(&rdev->dev);
+ snprintf(rdev->dev.bus_id, sizeof(rdev->dev.bus_id),
+ "regulator_%ld_%s",
+ (unsigned long)atomic_inc_return(®ulator_no) - 1,
+ regulator_desc->name);
+
+ ret = device_add(&rdev->dev);
+ if (ret == 0)
+ list_add(&rdev->list, ®ulator_list);
+ else {
+ kfree(rdev);
+ rdev = ERR_PTR(ret);
+ }
+ mutex_unlock(®ulator_list_mutex);
+ return rdev;
+}
+EXPORT_SYMBOL_GPL(regulator_register);
+
+/**
+ * regulator_unregister - unregister regulator
+ * @regulator: regulator source
+ *
+ * Called by regulator drivers to unregister a regulator.
+ */
+void regulator_unregister(struct regulator_dev *rdev)
+{
+ if (rdev == NULL)
+ return;
+
+ mutex_lock(®ulator_list_mutex);
+ list_del(&rdev->list);
+ if (rdev->supply)
+ sysfs_remove_link(&rdev->dev.kobj, "supply");
+ device_unregister(&rdev->dev);
+ mutex_unlock(®ulator_list_mutex);
+}
+EXPORT_SYMBOL_GPL(regulator_unregister);
+
+/**
+ * regulator_set_supply - set regulator supply regulator
+ * @regulator: regulator name
+ * @supply: supply regulator name
+ *
+ * Called by platform initialisation code to set the supply regulator for this
+ * regulator. This ensures that a regulators supply will also be enabled by the
+ * core if it's child is enabled.
+ */
+int regulator_set_supply(const char *regulator, const char *supply)
+{
+ struct regulator_dev *rdev, *supply_rdev;
+ int err;
+
+ if (regulator == NULL || supply == NULL)
+ return -EINVAL;
+
+ mutex_lock(®ulator_list_mutex);
+
+ list_for_each_entry(rdev, ®ulator_list, list) {
+ if (!strcmp(rdev->desc->name, regulator))
+ goto found_regulator;
+ }
+ mutex_unlock(®ulator_list_mutex);
+ return -ENODEV;
+
+found_regulator:
+ list_for_each_entry(supply_rdev, ®ulator_list, list) {
+ if (!strcmp(supply_rdev->desc->name, supply))
+ goto found_supply;
+ }
+ mutex_unlock(®ulator_list_mutex);
+ return -ENODEV;
+
+found_supply:
+ err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
+ "supply");
+ if (err) {
+ printk(KERN_ERR
+ "%s: could not add device link %s err %d\n",
+ __func__, supply_rdev->dev.kobj.name, err);
+ goto out;
+ }
+ rdev->supply = supply_rdev;
+ list_add(&rdev->slist, &supply_rdev->supply_list);
+out:
+ mutex_unlock(®ulator_list_mutex);
+ return err;
+}
+EXPORT_SYMBOL_GPL(regulator_set_supply);
+
+/**
+ * regulator_get_supply - get regulator supply regulator
+ * @regulator: regulator name
+ *
+ * Returns the supply supply regulator name or NULL if no supply regulator
+ * exists (i.e the regulator is supplied directly from USB, Line, Battery, etc)
+ */
+const char *regulator_get_supply(const char *regulator)
+{
+ struct regulator_dev *rdev;
+
+ if (regulator == NULL)
+ return NULL;
+
+ mutex_lock(®ulator_list_mutex);
+ list_for_each_entry(rdev, ®ulator_list, list) {
+ if (!strcmp(rdev->desc->name, regulator))
+ goto found;
+ }
+ mutex_unlock(®ulator_list_mutex);
+ return NULL;
+
+found:
+ mutex_unlock(®ulator_list_mutex);
+ if (rdev->supply)
+ return rdev->supply->desc->name;
+ else
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(regulator_get_supply);
+
+/**
+ * regulator_set_machine_constraints - sets regulator constraints
+ * @regulator: regulator source
+ *
+ * Allows platform initialisation code to define and constrain
+ * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
+ * Constraints *must* be set by platform code in order for some
+ * regulator operations to proceed i.e. set_voltage, set_current_limit,
+ * set_mode.
+ */
+int regulator_set_machine_constraints(const char *regulator_name,
+ struct regulation_constraints *constraints)
+{
+ struct regulator_dev *rdev;
+ int ret = 0;
+
+ if (regulator_name == NULL)
+ return -EINVAL;
+
+ mutex_lock(®ulator_list_mutex);
+
+ list_for_each_entry(rdev, ®ulator_list, list) {
+ if (!strcmp(regulator_name, rdev->desc->name))
+ goto found;
+ }
+ ret = -ENODEV;
+ goto out;
+
+found:
+ mutex_lock(&rdev->mutex);
+ rdev->constraints = constraints;
+
+ /* do we need to apply the constraint voltage */
+ if (rdev->constraints->apply_uV &&
+ rdev->constraints->min_uV == rdev->constraints->max_uV &&
+ rdev->desc->ops->set_voltage) {
+ ret = rdev->desc->ops->set_voltage(rdev,
+ rdev->constraints->min_uV, rdev->constraints->max_uV);
+ if (ret < 0) {
+ printk(KERN_ERR "%s: failed to apply %duV"
+ " constraint\n", __func__,
+ rdev->constraints->min_uV);
+ rdev->constraints = NULL;
+ goto out;
+ }
+ }
+
+ /* are we enabled at boot time by firmware / bootloader */
+ if (rdev->constraints->boot_on)
+ rdev->use_count = 1;
+
+ /* do we need to setup our suspend state */
+ if (constraints->initial_state)
+ ret = suspend_prepare(rdev, constraints->initial_state);
+
+ print_constraints(rdev);
+ mutex_unlock(&rdev->mutex);
+
+out:
+ mutex_unlock(®ulator_list_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_set_machine_constraints);
+
+
+/**
+ * regulator_set_device_supply: Bind a regulator to a symbolic supply
+ * @regulator: regulator source
+ * @dev: device the supply applies to
+ * @supply: symbolic name for supply
+ *
+ * Allows platform initialisation code to map physical regulator
+ * sources to symbolic names for supplies for use by devices. Devices
+ * should use these symbolic names to request regulators, avoiding the
+ * need to provide board-specific regulator names as platform data.
+ */
+int regulator_set_device_supply(const char *regulator, struct device *dev,
+ const char *supply)
+{
+ struct regulator_map *node;
+
+ if (regulator == NULL || supply == NULL)
+ return -EINVAL;
+
+ node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL);
+ if (node == NULL)
+ return -ENOMEM;
+
+ node->regulator = regulator;
+ node->dev = dev;
+ node->supply = supply;
+
+ mutex_lock(®ulator_list_mutex);
+ list_add(&node->list, ®ulator_map_list);
+ mutex_unlock(®ulator_list_mutex);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(regulator_set_device_supply);
+
+/**
+ * regulator_suspend_prepare: prepare regulators for system wide suspend
+ * @state: system suspend state
+ *
+ * Configure each regulator with it's suspend operating parameters for state.
+ * This will usually be called by machine suspend code prior to supending.
+ */
+int regulator_suspend_prepare(suspend_state_t state)
+{
+ struct regulator_dev *rdev;
+ int ret = 0;
+
+ /* ON is handled by regulator active state */
+ if (state == PM_SUSPEND_ON)
+ return -EINVAL;
+
+ mutex_lock(®ulator_list_mutex);
+ list_for_each_entry(rdev, ®ulator_list, list) {
+
+ mutex_lock(&rdev->mutex);
+ ret = suspend_prepare(rdev, state);
+ mutex_unlock(&rdev->mutex);
+
+ if (ret < 0) {
+ printk(KERN_ERR "%s: failed to prepare %s\n",
+ __func__, rdev->desc->name);
+ goto out;
+ }
+ }
+out:
+ mutex_unlock(®ulator_list_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
+
+/**
+ * rdev_get_drvdata - get rdev regulator driver data
+ * @regulator: regulator
+ *
+ * Get rdev regulator driver private data. This call can be used in the
+ * regulator driver context.
+ */
+void *rdev_get_drvdata(struct regulator_dev *rdev)
+{
+ return rdev->reg_data;
+}
+EXPORT_SYMBOL_GPL(rdev_get_drvdata);
+
+/**
+ * regulator_get_drvdata - get regulator driver data
+ * @regulator: regulator
+ *
+ * Get regulator driver private data. This call can be used in the consumer
+ * driver context when non API regulator specific functions need to be called.
+ */
+void *regulator_get_drvdata(struct regulator *regulator)
+{
+ return regulator->rdev->reg_data;
+}
+EXPORT_SYMBOL_GPL(regulator_get_drvdata);
+
+/**
+ * regulator_set_drvdata - set regulator driver data
+ * @regulator: regulator
+ * @data: data
+ */
+void regulator_set_drvdata(struct regulator *regulator, void *data)
+{
+ regulator->rdev->reg_data = data;
+}
+EXPORT_SYMBOL_GPL(regulator_set_drvdata);
+
+/**
+ * regulator_get_id - get regulator ID
+ * @regulator: regulator
+ */
+int rdev_get_id(struct regulator_dev *rdev)
+{
+ return rdev->desc->id;
+}
+EXPORT_SYMBOL_GPL(rdev_get_id);
+
+static int __init regulator_init(void)
+{
+ printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
+ return class_register(®ulator_class);
+}
+
+/* init early to allow our consumers to complete system booting */
+core_initcall(regulator_init);
projects / openwrt / staging / blogic.git / commitdiff