*
*/
-#define pr_fmt(fmt) "%s: " fmt, __func__
-
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/slab.h>
+#include <linux/async.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/suspend.h>
#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/regulator/of_regulator.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
+#include <linux/module.h>
#define CREATE_TRACE_POINTS
#include <trace/events/regulator.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
#include "dummy.h"
+#define rdev_crit(rdev, fmt, ...) \
+ pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
#define rdev_err(rdev, fmt, ...) \
pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
#define rdev_warn(rdev, fmt, ...) \
static bool has_full_constraints;
static bool board_wants_dummy_regulator;
-#ifdef CONFIG_DEBUG_FS
static struct dentry *debugfs_root;
-#endif
/*
* struct regulator_map
char *supply_name;
struct device_attribute dev_attr;
struct regulator_dev *rdev;
+ struct dentry *debugfs;
};
static int _regulator_is_enabled(struct regulator_dev *rdev);
-static int _regulator_disable(struct regulator_dev *rdev,
- struct regulator_dev **supply_rdev_ptr);
+static int _regulator_disable(struct regulator_dev *rdev);
+static int _regulator_enable(struct regulator_dev *rdev);
+static int _regulator_get_enable_time(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);
unsigned long event, void *data);
static int _regulator_do_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV);
+static struct regulator *create_regulator(struct regulator_dev *rdev,
+ struct device *dev,
+ const char *supply_name);
static const char *rdev_get_name(struct regulator_dev *rdev)
{
return NULL;
}
+/**
+ * of_get_regulator - get a regulator device node based on supply name
+ * @dev: Device pointer for the consumer (of regulator) device
+ * @supply: regulator supply name
+ *
+ * Extract the regulator device node corresponding to the supply name.
+ * retruns the device node corresponding to the regulator if found, else
+ * returns NULL.
+ */
+static struct device_node *of_get_regulator(struct device *dev, const char *supply)
+{
+ struct device_node *regnode = NULL;
+ char prop_name[32]; /* 32 is max size of property name */
+
+ dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
+
+ snprintf(prop_name, 32, "%s-supply", supply);
+ regnode = of_parse_phandle(dev->of_node, prop_name, 0);
+
+ if (!regnode) {
+ dev_dbg(dev, "Looking up %s property in node %s failed",
+ prop_name, dev->of_node->full_name);
+ return NULL;
+ }
+ return regnode;
+}
+
/* Platform voltage constraint check */
static int regulator_check_voltage(struct regulator_dev *rdev,
int *min_uV, int *max_uV)
if (*min_uV < rdev->constraints->min_uV)
*min_uV = rdev->constraints->min_uV;
- if (*min_uV > *max_uV)
+ if (*min_uV > *max_uV) {
+ rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
+ *min_uV, *max_uV);
return -EINVAL;
+ }
return 0;
}
struct regulator *regulator;
list_for_each_entry(regulator, &rdev->consumer_list, list) {
+ /*
+ * Assume consumers that didn't say anything are OK
+ * with anything in the constraint range.
+ */
+ if (!regulator->min_uV && !regulator->max_uV)
+ continue;
+
if (*max_uV > regulator->max_uV)
*max_uV = regulator->max_uV;
if (*min_uV < regulator->min_uV)
if (*min_uA < rdev->constraints->min_uA)
*min_uA = rdev->constraints->min_uA;
- if (*min_uA > *max_uA)
+ if (*min_uA > *max_uA) {
+ rdev_err(rdev, "unsupportable current range: %d-%duA\n",
+ *min_uA, *max_uA);
return -EINVAL;
+ }
return 0;
}
/* operating mode constraint check */
-static int regulator_check_mode(struct regulator_dev *rdev, int mode)
+static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
{
- switch (mode) {
+ switch (*mode) {
case REGULATOR_MODE_FAST:
case REGULATOR_MODE_NORMAL:
case REGULATOR_MODE_IDLE:
case REGULATOR_MODE_STANDBY:
break;
default:
+ rdev_err(rdev, "invalid mode %x specified\n", *mode);
return -EINVAL;
}
rdev_err(rdev, "operation not allowed\n");
return -EPERM;
}
- if (!(rdev->constraints->valid_modes_mask & mode)) {
- rdev_err(rdev, "invalid mode %x\n", mode);
- return -EINVAL;
+
+ /* The modes are bitmasks, the most power hungry modes having
+ * the lowest values. If the requested mode isn't supported
+ * try higher modes. */
+ while (*mode) {
+ if (rdev->constraints->valid_modes_mask & *mode)
+ return 0;
+ *mode /= 2;
}
- return 0;
+
+ return -EINVAL;
}
/* dynamic regulator mode switching constraint check */
return sprintf(buf, "%d\n", regulator->uA_load);
}
+static ssize_t regulator_uV_set(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct regulator_dev *rdev = dev_get_drvdata(dev);
+ int ret;
+ int min_uV;
+ int max_uV = rdev->constraints->max_uV;
+ char *p = (char *)buf;
+
+ min_uV = memparse(p, &p);
+ mutex_lock(&rdev->mutex);
+
+ /* sanity check */
+ if (!rdev->desc->ops->set_voltage &&
+ !rdev->desc->ops->set_voltage_sel) {
+ rdev_err(rdev, "The operation is not supported\n");
+ goto out;
+ }
+
+ /* constraints check */
+ ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
+ if (ret < 0) {
+ rdev_err(rdev, "Voltage is out of range min:max= %d:%d\n",
+ rdev->constraints->min_uV, rdev->constraints->max_uV);
+ goto out;
+ }
+
+ /* Consumer check */
+ ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
+ if (ret < 0) {
+ rdev_warn(rdev, "new voltage is out-range for some consumer\n");
+ rdev_warn(rdev, "min: max = %d:%d\n", min_uV, max_uV);
+ }
+
+ rdev_info(rdev, "Setting voltage min:max = %d:%d\n", min_uV, max_uV);
+ ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
+ if (ret < 0)
+ rdev_warn(rdev, "Can not set voltage %d:%d\n", min_uV, max_uV);
+
+out:
+ mutex_unlock(&rdev->mutex);
+ return count;
+}
+
static ssize_t regulator_uV_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return ret;
}
-static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
+static DEVICE_ATTR(microvolts, 0644, regulator_uV_show, regulator_uV_set);
static ssize_t regulator_uA_show(struct device *dev,
struct device_attribute *attr, char *buf)
return ret;
}
-static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
+
+static ssize_t regulator_state_set(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct regulator_dev *rdev = dev_get_drvdata(dev);
+ int ret;
+ bool enabled;
+
+ if ((*buf == 'E') || (*buf == 'e'))
+ enabled = true;
+ else if ((*buf == 'D') || (*buf == 'd'))
+ enabled = false;
+ else
+ return -EINVAL;
+
+ if ((_regulator_is_enabled(rdev) && enabled) ||
+ (!_regulator_is_enabled(rdev) && !enabled))
+ return count;
+
+ mutex_lock(&rdev->mutex);
+ if (enabled) {
+ int delay = 0;
+ if (!rdev->desc->ops->enable) {
+ ret = -EINVAL;
+ goto end;
+ }
+ ret = _regulator_get_enable_time(rdev);
+ if (ret >= 0)
+ delay = ret;
+ ret = rdev->desc->ops->enable(rdev);
+ if (ret < 0) {
+ rdev_warn(rdev, "enable() failed: %d\n", ret);
+ goto end;
+ }
+ if (delay >= 1000) {
+ mdelay(delay / 1000);
+ udelay(delay % 1000);
+ } else if (delay) {
+ udelay(delay);
+ }
+ } else {
+ if (!rdev->desc->ops->disable) {
+ ret = -EINVAL;
+ goto end;
+ }
+ ret = rdev->desc->ops->disable(rdev);
+ if (ret < 0) {
+ rdev_warn(rdev, "disable() failed: %d\n", ret);
+ goto end;
+ }
+ }
+
+end:
+ mutex_unlock(&rdev->mutex);
+ if (ret < 0)
+ return ret;
+ return count;
+}
+static DEVICE_ATTR(state, 0644, regulator_state_show, regulator_state_set);
static ssize_t regulator_status_show(struct device *dev,
struct device_attribute *attr, char *buf)
output_uV, current_uA);
/* check the new mode is allowed */
- err = regulator_check_mode(rdev, mode);
+ err = regulator_mode_constrain(rdev, &mode);
if (err == 0)
rdev->desc->ops->set_mode(rdev, mode);
}
count += sprintf(buf + count, "at %d mV ", ret / 1000);
}
+ if (constraints->uV_offset)
+ count += sprintf(buf, "%dmV offset ",
+ constraints->uV_offset / 1000);
+
if (constraints->min_uA && constraints->max_uA) {
if (constraints->min_uA == constraints->max_uA)
count += sprintf(buf + count, "%d mA ",
count += sprintf(buf + count, "standby");
rdev_info(rdev, "%s\n", buf);
+
+ if ((constraints->min_uV != constraints->max_uV) &&
+ !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
+ rdev_warn(rdev,
+ "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
}
static int machine_constraints_voltage(struct regulator_dev *rdev,
if (ret < 0) {
rdev_err(rdev, "failed to apply %duV constraint\n",
rdev->constraints->min_uV);
- rdev->constraints = NULL;
return ret;
}
}
int ret = 0;
struct regulator_ops *ops = rdev->desc->ops;
- rdev->constraints = kmemdup(constraints, sizeof(*constraints),
- GFP_KERNEL);
+ if (constraints)
+ rdev->constraints = kmemdup(constraints, sizeof(*constraints),
+ GFP_KERNEL);
+ else
+ rdev->constraints = kzalloc(sizeof(*constraints),
+ GFP_KERNEL);
if (!rdev->constraints)
return -ENOMEM;
goto out;
/* do we need to setup our suspend state */
- if (constraints->initial_state) {
+ if (rdev->constraints->initial_state) {
ret = suspend_prepare(rdev, rdev->constraints->initial_state);
if (ret < 0) {
rdev_err(rdev, "failed to set suspend state\n");
- rdev->constraints = NULL;
goto out;
}
}
- if (constraints->initial_mode) {
+ if (rdev->constraints->initial_mode) {
if (!ops->set_mode) {
rdev_err(rdev, "no set_mode operation\n");
ret = -EINVAL;
ret = ops->enable(rdev);
if (ret < 0) {
rdev_err(rdev, "failed to enable\n");
- rdev->constraints = NULL;
goto out;
}
}
print_constraints(rdev);
+ return 0;
out:
+ kfree(rdev->constraints);
+ rdev->constraints = NULL;
return ret;
}
* core if it's child is enabled.
*/
static int set_supply(struct regulator_dev *rdev,
- struct regulator_dev *supply_rdev)
+ struct regulator_dev *supply_rdev)
{
int err;
- err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
- "supply");
- if (err) {
- rdev_err(rdev, "could not add device link %s err %d\n",
- supply_rdev->dev.kobj.name, err);
- goto out;
+ rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
+
+ rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
+ if (rdev->supply == NULL) {
+ err = -ENOMEM;
+ return err;
}
- rdev->supply = supply_rdev;
- list_add(&rdev->slist, &supply_rdev->supply_list);
-out:
- return err;
+
+ return 0;
}
/**
* set_consumer_device_supply - Bind a regulator to a symbolic supply
* @rdev: regulator source
- * @consumer_dev: device the supply applies to
* @consumer_dev_name: dev_name() string for device supply applies to
* @supply: symbolic name for supply
*
* 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.
- *
- * Only one of consumer_dev and consumer_dev_name may be specified.
*/
static int set_consumer_device_supply(struct regulator_dev *rdev,
- struct device *consumer_dev, const char *consumer_dev_name,
- const char *supply)
+ const char *consumer_dev_name,
+ const char *supply)
{
struct regulator_map *node;
int has_dev;
- if (consumer_dev && consumer_dev_name)
- return -EINVAL;
-
- if (!consumer_dev_name && consumer_dev)
- consumer_dev_name = dev_name(consumer_dev);
-
if (supply == NULL)
return -EINVAL;
if (strcmp(node->supply, supply) != 0)
continue;
- dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
- dev_name(&node->regulator->dev),
- node->regulator->desc->name,
- supply,
- dev_name(&rdev->dev), rdev_get_name(rdev));
+ pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
+ consumer_dev_name,
+ dev_name(&node->regulator->dev),
+ node->regulator->desc->name,
+ supply,
+ dev_name(&rdev->dev), rdev_get_name(rdev));
return -EBUSY;
}
}
}
-#define REG_STR_SIZE 32
+#define REG_STR_SIZE 64
static struct regulator *create_regulator(struct regulator_dev *rdev,
struct device *dev,
if (dev) {
/* create a 'requested_microamps_name' sysfs entry */
- size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
- supply_name);
+ size = scnprintf(buf, REG_STR_SIZE,
+ "microamps_requested_%s-%s",
+ dev_name(dev), supply_name);
if (size >= REG_STR_SIZE)
goto overflow_err;
dev->kobj.name, err);
goto link_name_err;
}
+ } else {
+ regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
+ if (regulator->supply_name == NULL)
+ goto attr_err;
+ }
+
+ regulator->debugfs = debugfs_create_dir(regulator->supply_name,
+ rdev->debugfs);
+ if (!regulator->debugfs) {
+ rdev_warn(rdev, "Failed to create debugfs directory\n");
+ } else {
+ debugfs_create_u32("uA_load", 0444, regulator->debugfs,
+ ®ulator->uA_load);
+ debugfs_create_u32("min_uV", 0444, regulator->debugfs,
+ ®ulator->min_uV);
+ debugfs_create_u32("max_uV", 0444, regulator->debugfs,
+ ®ulator->max_uV);
}
+
mutex_unlock(&rdev->mutex);
return regulator;
link_name_err:
return rdev->desc->ops->enable_time(rdev);
}
+static struct regulator_dev *regulator_dev_lookup(struct device *dev,
+ const char *supply)
+{
+ struct regulator_dev *r;
+ struct device_node *node;
+
+ /* first do a dt based lookup */
+ if (dev && dev->of_node) {
+ node = of_get_regulator(dev, supply);
+ if (node)
+ list_for_each_entry(r, ®ulator_list, list)
+ if (r->dev.parent &&
+ node == r->dev.of_node)
+ return r;
+ }
+
+ /* if not found, try doing it non-dt way */
+ list_for_each_entry(r, ®ulator_list, list)
+ if (strcmp(rdev_get_name(r), supply) == 0)
+ return r;
+
+ return NULL;
+}
+
/* Internal regulator request function */
static struct regulator *_regulator_get(struct device *dev, const char *id,
int exclusive)
{
struct regulator_dev *rdev;
struct regulator_map *map;
- struct regulator *regulator = ERR_PTR(-ENODEV);
+ struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
const char *devname = NULL;
int ret;
mutex_lock(®ulator_list_mutex);
+ rdev = regulator_dev_lookup(dev, id);
+ if (rdev)
+ goto found;
+
list_for_each_entry(map, ®ulator_map_list, list) {
/* If the mapping has a device set up it must match */
if (map->dev_name &&
if (regulator == NULL) {
regulator = ERR_PTR(-ENOMEM);
module_put(rdev->owner);
+ goto out;
}
rdev->open_count++;
}
EXPORT_SYMBOL_GPL(regulator_get);
+static void devm_regulator_release(struct device *dev, void *res)
+{
+ regulator_put(*(struct regulator **)res);
+}
+
+/**
+ * devm_regulator_get - Resource managed regulator_get()
+ * @dev: device for regulator "consumer"
+ * @id: Supply name or regulator ID.
+ *
+ * Managed regulator_get(). Regulators returned from this function are
+ * automatically regulator_put() on driver detach. See regulator_get() for more
+ * information.
+ */
+struct regulator *devm_regulator_get(struct device *dev, const char *id)
+{
+ struct regulator **ptr, *regulator;
+
+ ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ regulator = regulator_get(dev, id);
+ if (!IS_ERR(regulator)) {
+ *ptr = regulator;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return regulator;
+}
+EXPORT_SYMBOL_GPL(devm_regulator_get);
+
/**
* regulator_get_exclusive - obtain exclusive access to a regulator.
* @dev: device for regulator "consumer"
mutex_lock(®ulator_list_mutex);
rdev = regulator->rdev;
+ debugfs_remove_recursive(regulator->debugfs);
+
/* 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);
}
+ kfree(regulator->supply_name);
list_del(®ulator->list);
kfree(regulator);
}
EXPORT_SYMBOL_GPL(regulator_put);
+static int devm_regulator_match(struct device *dev, void *res, void *data)
+{
+ struct regulator **r = res;
+ if (!r || !*r) {
+ WARN_ON(!r || !*r);
+ return 0;
+ }
+ return *r == data;
+}
+
+/**
+ * devm_regulator_put - Resource managed regulator_put()
+ * @regulator: regulator to free
+ *
+ * Deallocate a regulator allocated with devm_regulator_get(). Normally
+ * this function will not need to be called and the resource management
+ * code will ensure that the resource is freed.
+ */
+void devm_regulator_put(struct regulator *regulator)
+{
+ int rc;
+
+ rc = devres_destroy(regulator->dev, devm_regulator_release,
+ devm_regulator_match, regulator);
+ if (rc == 0)
+ regulator_put(regulator);
+ else
+ WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_put);
+
static int _regulator_can_change_status(struct regulator_dev *rdev)
{
if (!rdev->constraints)
{
int ret, delay;
- if (rdev->use_count == 0) {
- /* do we need to enable the supply regulator first */
- if (rdev->supply) {
- mutex_lock(&rdev->supply->mutex);
- ret = _regulator_enable(rdev->supply);
- mutex_unlock(&rdev->supply->mutex);
- if (ret < 0) {
- rdev_err(rdev, "failed to enable: %d\n", ret);
- return ret;
- }
- }
- }
-
/* check voltage and requested load before enabling */
if (rdev->constraints &&
(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
return -EINVAL;
/* Query before enabling in case configuration
- * dependant. */
+ * dependent. */
ret = _regulator_get_enable_time(rdev);
if (ret >= 0) {
delay = ret;
}
trace_regulator_enable(rdev_get_name(rdev));
+ _notifier_call_chain(
+ rdev, REGULATOR_EVENT_PRE_ENABLE, NULL);
/* Allow the regulator to ramp; it would be useful
* to extend this for bulk operations so that the
udelay(delay);
}
+ _notifier_call_chain(
+ rdev, REGULATOR_EVENT_POST_ENABLE, NULL);
trace_regulator_enable_complete(rdev_get_name(rdev));
} else if (ret < 0) {
struct regulator_dev *rdev = regulator->rdev;
int ret = 0;
+ if (rdev->supply) {
+ ret = regulator_enable(rdev->supply);
+ if (ret != 0)
+ return ret;
+ }
+
mutex_lock(&rdev->mutex);
ret = _regulator_enable(rdev);
mutex_unlock(&rdev->mutex);
+
+ if (ret != 0 && rdev->supply)
+ regulator_disable(rdev->supply);
+
return ret;
}
EXPORT_SYMBOL_GPL(regulator_enable);
/* locks held by regulator_disable() */
-static int _regulator_disable(struct regulator_dev *rdev,
- struct regulator_dev **supply_rdev_ptr)
+static int _regulator_disable(struct regulator_dev *rdev)
{
int ret = 0;
- *supply_rdev_ptr = NULL;
if (WARN(rdev->use_count <= 0,
"unbalanced disables for %s\n", rdev_get_name(rdev)))
NULL);
}
- /* decrease our supplies ref count and disable if required */
- *supply_rdev_ptr = rdev->supply;
-
rdev->use_count = 0;
} else if (rdev->use_count > 1) {
rdev->use_count--;
}
+
return ret;
}
int regulator_disable(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
- struct regulator_dev *supply_rdev = NULL;
int ret = 0;
mutex_lock(&rdev->mutex);
- ret = _regulator_disable(rdev, &supply_rdev);
+ ret = _regulator_disable(rdev);
mutex_unlock(&rdev->mutex);
- /* decrease our supplies ref count and disable if required */
- while (supply_rdev != NULL) {
- rdev = supply_rdev;
-
- mutex_lock(&rdev->mutex);
- _regulator_disable(rdev, &supply_rdev);
- mutex_unlock(&rdev->mutex);
- }
+ if (ret == 0 && rdev->supply)
+ regulator_disable(rdev->supply);
return ret;
}
EXPORT_SYMBOL_GPL(regulator_disable);
/* locks held by regulator_force_disable() */
-static int _regulator_force_disable(struct regulator_dev *rdev,
- struct regulator_dev **supply_rdev_ptr)
+static int _regulator_force_disable(struct regulator_dev *rdev)
{
int ret = 0;
REGULATOR_EVENT_DISABLE, NULL);
}
- /* decrease our supplies ref count and disable if required */
- *supply_rdev_ptr = rdev->supply;
-
- rdev->use_count = 0;
return ret;
}
*/
int regulator_force_disable(struct regulator *regulator)
{
- struct regulator_dev *supply_rdev = NULL;
+ struct regulator_dev *rdev = regulator->rdev;
int ret;
- mutex_lock(®ulator->rdev->mutex);
+ mutex_lock(&rdev->mutex);
regulator->uA_load = 0;
- ret = _regulator_force_disable(regulator->rdev, &supply_rdev);
- mutex_unlock(®ulator->rdev->mutex);
+ ret = _regulator_force_disable(regulator->rdev);
+ mutex_unlock(&rdev->mutex);
- if (supply_rdev)
- regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev)));
+ if (rdev->supply)
+ while (rdev->open_count--)
+ regulator_disable(rdev->supply);
return ret;
}
EXPORT_SYMBOL_GPL(regulator_force_disable);
+static void regulator_disable_work(struct work_struct *work)
+{
+ struct regulator_dev *rdev = container_of(work, struct regulator_dev,
+ disable_work.work);
+ int count, i, ret;
+
+ mutex_lock(&rdev->mutex);
+
+ BUG_ON(!rdev->deferred_disables);
+
+ count = rdev->deferred_disables;
+ rdev->deferred_disables = 0;
+
+ for (i = 0; i < count; i++) {
+ ret = _regulator_disable(rdev);
+ if (ret != 0)
+ rdev_err(rdev, "Deferred disable failed: %d\n", ret);
+ }
+
+ mutex_unlock(&rdev->mutex);
+
+ if (rdev->supply) {
+ for (i = 0; i < count; i++) {
+ ret = regulator_disable(rdev->supply);
+ if (ret != 0) {
+ rdev_err(rdev,
+ "Supply disable failed: %d\n", ret);
+ }
+ }
+ }
+}
+
+/**
+ * regulator_disable_deferred - disable regulator output with delay
+ * @regulator: regulator source
+ * @ms: miliseconds until the regulator is disabled
+ *
+ * Execute regulator_disable() on the regulator after a delay. This
+ * is intended for use with devices that require some time to quiesce.
+ *
+ * NOTE: this will only disable the regulator output if no other consumer
+ * devices have it enabled, the regulator device supports disabling and
+ * machine constraints permit this operation.
+ */
+int regulator_disable_deferred(struct regulator *regulator, int ms)
+{
+ struct regulator_dev *rdev = regulator->rdev;
+ int ret;
+
+ mutex_lock(&rdev->mutex);
+ rdev->deferred_disables++;
+ mutex_unlock(&rdev->mutex);
+
+ ret = schedule_delayed_work(&rdev->disable_work,
+ msecs_to_jiffies(ms));
+ if (ret < 0)
+ return ret;
+ else
+ return 0;
+}
+EXPORT_SYMBOL_GPL(regulator_disable_deferred);
+
static int _regulator_is_enabled(struct regulator_dev *rdev)
{
/* If we don't know then assume that the regulator is always on */
return 0;
}
+EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
static int _regulator_do_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
int ret;
+ int delay = 0;
unsigned int selector;
trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
+ min_uV += rdev->constraints->uV_offset;
+ max_uV += rdev->constraints->uV_offset;
+
if (rdev->desc->ops->set_voltage) {
+ if (_regulator_is_enabled(rdev))
+ _notifier_call_chain(rdev,
+ REGULATOR_EVENT_OUT_PRECHANGE, (void *)min_uV);
+
ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
&selector);
}
}
+ /*
+ * If we can't obtain the old selector there is not enough
+ * info to call set_voltage_time_sel().
+ */
+ if (rdev->desc->ops->set_voltage_time_sel &&
+ rdev->desc->ops->get_voltage_sel) {
+ unsigned int old_selector = 0;
+
+ ret = rdev->desc->ops->get_voltage_sel(rdev);
+ if (ret < 0)
+ return ret;
+ old_selector = ret;
+ ret = rdev->desc->ops->set_voltage_time_sel(rdev,
+ old_selector, selector);
+ if (ret < 0)
+ rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", ret);
+ else
+ delay = ret;
+ }
+
if (best_val != INT_MAX) {
+ if (_regulator_is_enabled(rdev))
+ _notifier_call_chain(rdev,
+ REGULATOR_EVENT_OUT_PRECHANGE, (void *)best_val);
+
ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
selector = best_val;
} else {
ret = -EINVAL;
}
+ /* Insert any necessary delays */
+ if (delay >= 1000) {
+ mdelay(delay / 1000);
+ udelay(delay % 1000);
+ } else if (delay) {
+ udelay(delay);
+ }
+
if (ret == 0)
_notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
NULL);
+ if (_regulator_is_enabled(rdev)) {
+ if (selector != -1)
+ min_uV = selector;
+ _notifier_call_chain(rdev, REGULATOR_EVENT_OUT_POSTCHANGE,
+ (void *)min_uV);
+ }
+
trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector);
return ret;
}
EXPORT_SYMBOL_GPL(regulator_set_voltage);
+/**
+ * regulator_set_voltage_time - get raise/fall time
+ * @regulator: regulator source
+ * @old_uV: starting voltage in microvolts
+ * @new_uV: target voltage in microvolts
+ *
+ * Provided with the starting and ending voltage, this function attempts to
+ * calculate the time in microseconds required to rise or fall to this new
+ * voltage.
+ */
+int regulator_set_voltage_time(struct regulator *regulator,
+ int old_uV, int new_uV)
+{
+ struct regulator_dev *rdev = regulator->rdev;
+ struct regulator_ops *ops = rdev->desc->ops;
+ int old_sel = -1;
+ int new_sel = -1;
+ int voltage;
+ int i;
+
+ /* Currently requires operations to do this */
+ if (!ops->list_voltage || !ops->set_voltage_time_sel
+ || !rdev->desc->n_voltages)
+ return -EINVAL;
+
+ for (i = 0; i < rdev->desc->n_voltages; i++) {
+ /* We only look for exact voltage matches here */
+ voltage = regulator_list_voltage(regulator, i);
+ if (voltage < 0)
+ return -EINVAL;
+ if (voltage == 0)
+ continue;
+ if (voltage == old_uV)
+ old_sel = i;
+ if (voltage == new_uV)
+ new_sel = i;
+ }
+
+ if (old_sel < 0 || new_sel < 0)
+ return -EINVAL;
+
+ return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
+}
+EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
+
/**
* regulator_sync_voltage - re-apply last regulator output voltage
* @regulator: regulator source
static int _regulator_get_voltage(struct regulator_dev *rdev)
{
- int sel;
+ int sel, ret;
if (rdev->desc->ops->get_voltage_sel) {
sel = rdev->desc->ops->get_voltage_sel(rdev);
if (sel < 0)
return sel;
- return rdev->desc->ops->list_voltage(rdev, sel);
- }
- if (rdev->desc->ops->get_voltage)
- return rdev->desc->ops->get_voltage(rdev);
- else
+ ret = rdev->desc->ops->list_voltage(rdev, sel);
+ } else if (rdev->desc->ops->get_voltage) {
+ ret = rdev->desc->ops->get_voltage(rdev);
+ } else {
return -EINVAL;
+ }
+
+ if (ret < 0)
+ return ret;
+ return ret - rdev->constraints->uV_offset;
}
/**
}
/* constraints check */
- ret = regulator_check_mode(rdev, mode);
+ ret = regulator_mode_constrain(rdev, &mode);
if (ret < 0)
goto out;
mutex_lock(&rdev->mutex);
+ /*
+ * first check to see if we can set modes at all, otherwise just
+ * tell the consumer everything is OK.
+ */
regulator->uA_load = uA_load;
ret = regulator_check_drms(rdev);
- if (ret < 0)
+ if (ret < 0) {
+ ret = 0;
goto out;
- ret = -EINVAL;
+ }
- /* sanity check */
if (!rdev->desc->ops->get_optimum_mode)
goto out;
+ /*
+ * we can actually do this so any errors are indicators of
+ * potential real failure.
+ */
+ ret = -EINVAL;
+
/* get output voltage */
output_uV = _regulator_get_voltage(rdev);
if (output_uV <= 0) {
/* get input voltage */
input_uV = 0;
if (rdev->supply)
- input_uV = _regulator_get_voltage(rdev->supply);
+ input_uV = regulator_get_voltage(rdev->supply);
if (input_uV <= 0)
input_uV = rdev->constraints->input_uV;
if (input_uV <= 0) {
mode = rdev->desc->ops->get_optimum_mode(rdev,
input_uV, output_uV,
total_uA_load);
- ret = regulator_check_mode(rdev, mode);
+ ret = regulator_mode_constrain(rdev, &mode);
if (ret < 0) {
rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
total_uA_load, input_uV, output_uV);
static void _notifier_call_chain(struct regulator_dev *rdev,
unsigned long event, void *data)
{
- struct regulator_dev *_rdev;
-
/* call rdev chain first */
- blocking_notifier_call_chain(&rdev->notifier, event, NULL);
-
- /* now notify regulator we supply */
- list_for_each_entry(_rdev, &rdev->supply_list, slist) {
- mutex_lock(&_rdev->mutex);
- _notifier_call_chain(_rdev, event, data);
- mutex_unlock(&_rdev->mutex);
- }
+ blocking_notifier_call_chain(&rdev->notifier, event, data);
}
/**
return 0;
err:
- for (i = 0; i < num_consumers && consumers[i].consumer; i++)
+ while (--i >= 0)
regulator_put(consumers[i].consumer);
return ret;
}
EXPORT_SYMBOL_GPL(regulator_bulk_get);
+/**
+ * devm_regulator_bulk_get - managed 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 with management, the regulators will
+ * automatically be freed when the device is unbound. If any of the
+ * regulators cannot be acquired then any regulators that were
+ * allocated will be freed before returning to the caller.
+ */
+int devm_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 = devm_regulator_get(dev,
+ consumers[i].supply);
+ if (IS_ERR(consumers[i].consumer)) {
+ ret = PTR_ERR(consumers[i].consumer);
+ dev_err(dev, "Failed to get supply '%s': %d\n",
+ consumers[i].supply, ret);
+ consumers[i].consumer = NULL;
+ goto err;
+ }
+ }
+
+ return 0;
+
+err:
+ for (i = 0; i < num_consumers && consumers[i].consumer; i++)
+ devm_regulator_put(consumers[i].consumer);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
+
+static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
+{
+ struct regulator_bulk_data *bulk = data;
+
+ bulk->ret = regulator_enable(bulk->consumer);
+}
+
/**
* regulator_bulk_enable - enable multiple regulator consumers
*
int regulator_bulk_enable(int num_consumers,
struct regulator_bulk_data *consumers)
{
+ LIST_HEAD(async_domain);
int i;
- int ret;
+ int ret = 0;
+
+ for (i = 0; i < num_consumers; i++)
+ async_schedule_domain(regulator_bulk_enable_async,
+ &consumers[i], &async_domain);
+ async_synchronize_full_domain(&async_domain);
+
+ /* If any consumer failed we need to unwind any that succeeded */
for (i = 0; i < num_consumers; i++) {
- ret = regulator_enable(consumers[i].consumer);
- if (ret != 0)
+ if (consumers[i].ret != 0) {
+ ret = consumers[i].ret;
goto err;
+ }
}
return 0;
err:
pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
- for (--i; i >= 0; --i)
+ while (--i >= 0)
regulator_disable(consumers[i].consumer);
return ret;
* @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
+ * clients in a single API call. If any consumers cannot be disabled
+ * then any others that were disabled will be enabled again prior to
* return.
*/
int regulator_bulk_disable(int num_consumers,
int i;
int ret;
- for (i = 0; i < num_consumers; i++) {
+ for (i = num_consumers - 1; i >= 0; --i) {
ret = regulator_disable(consumers[i].consumer);
if (ret != 0)
goto err;
err:
pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
- for (--i; i >= 0; --i)
+ for (++i; i < num_consumers; ++i)
regulator_enable(consumers[i].consumer);
return ret;
}
EXPORT_SYMBOL_GPL(regulator_bulk_disable);
+/**
+ * regulator_bulk_force_disable - force 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 forcibly disable multiple regulator
+ * clients in a single API call.
+ * NOTE: This should be used for situations when device damage will
+ * likely occur if the regulators are not disabled (e.g. over temp).
+ * Although regulator_force_disable function call for some consumers can
+ * return error numbers, the function is called for all consumers.
+ */
+int regulator_bulk_force_disable(int num_consumers,
+ struct regulator_bulk_data *consumers)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < num_consumers; i++)
+ consumers[i].ret =
+ regulator_force_disable(consumers[i].consumer);
+
+ for (i = 0; i < num_consumers; i++) {
+ if (consumers[i].ret != 0) {
+ ret = consumers[i].ret;
+ goto out;
+ }
+ }
+
+ return 0;
+out:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
+
/**
* regulator_bulk_free - free multiple regulator consumers
*
int status = 0;
/* some attributes need specific methods to be displayed */
- if (ops->get_voltage || ops->get_voltage_sel) {
+ if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
+ (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
status = device_create_file(dev, &dev_attr_microvolts);
if (status < 0)
return status;
static void rdev_init_debugfs(struct regulator_dev *rdev)
{
-#ifdef CONFIG_DEBUG_FS
rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
- if (IS_ERR(rdev->debugfs) || !rdev->debugfs) {
+ if (!rdev->debugfs) {
rdev_warn(rdev, "Failed to create debugfs directory\n");
- rdev->debugfs = NULL;
return;
}
&rdev->use_count);
debugfs_create_u32("open_count", 0444, rdev->debugfs,
&rdev->open_count);
-#endif
}
/**
* @dev: struct device for the regulator
* @init_data: platform provided init data, passed through by driver
* @driver_data: private regulator data
+ * @of_node: OpenFirmware node to parse for device tree bindings (may be
+ * NULL).
*
* Called by regulator drivers to register a regulator.
* Returns 0 on success.
*/
struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
struct device *dev, const struct regulator_init_data *init_data,
- void *driver_data)
+ void *driver_data, struct device_node *of_node)
{
+ const struct regulation_constraints *constraints = NULL;
static atomic_t regulator_no = ATOMIC_INIT(0);
struct regulator_dev *rdev;
int ret, i;
+ const char *supply = NULL;
if (regulator_desc == NULL)
return ERR_PTR(-EINVAL);
regulator_desc->type != REGULATOR_CURRENT)
return ERR_PTR(-EINVAL);
- if (!init_data)
- return ERR_PTR(-EINVAL);
-
/* Only one of each should be implemented */
WARN_ON(regulator_desc->ops->get_voltage &&
regulator_desc->ops->get_voltage_sel);
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);
+ INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
/* preform any regulator specific init */
- if (init_data->regulator_init) {
+ if (init_data && init_data->regulator_init) {
ret = init_data->regulator_init(rdev->reg_data);
if (ret < 0)
goto clean;
/* register with sysfs */
rdev->dev.class = ®ulator_class;
+ rdev->dev.of_node = of_node;
rdev->dev.parent = dev;
dev_set_name(&rdev->dev, "regulator.%d",
atomic_inc_return(®ulator_no) - 1);
dev_set_drvdata(&rdev->dev, rdev);
/* set regulator constraints */
- ret = set_machine_constraints(rdev, &init_data->constraints);
+ if (init_data)
+ constraints = &init_data->constraints;
+
+ ret = set_machine_constraints(rdev, constraints);
if (ret < 0)
goto scrub;
if (ret < 0)
goto scrub;
- /* set supply regulator if it exists */
- if (init_data->supply_regulator && init_data->supply_regulator_dev) {
- dev_err(dev,
- "Supply regulator specified by both name and dev\n");
- ret = -EINVAL;
- goto scrub;
- }
+ if (init_data && init_data->supply_regulator)
+ supply = init_data->supply_regulator;
+#if 0 /* Reenable when EPROBE_DEFER is pulled. */
+ else if (regulator_desc->supply_name)
+ supply = regulator_desc->supply_name;
+#endif
- if (init_data->supply_regulator) {
+ if (supply) {
struct regulator_dev *r;
- int found = 0;
-
- list_for_each_entry(r, ®ulator_list, list) {
- if (strcmp(rdev_get_name(r),
- init_data->supply_regulator) == 0) {
- found = 1;
- break;
- }
- }
- if (!found) {
- dev_err(dev, "Failed to find supply %s\n",
- init_data->supply_regulator);
- ret = -ENODEV;
+ r = regulator_dev_lookup(dev, supply);
+ if (!r) {
+ dev_err(dev, "Failed to find supply %s\n", supply);
+ ret = -EPROBE_DEFER;
goto scrub;
}
ret = set_supply(rdev, r);
if (ret < 0)
goto scrub;
- }
- if (init_data->supply_regulator_dev) {
- dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n");
- ret = set_supply(rdev,
- dev_get_drvdata(init_data->supply_regulator_dev));
- if (ret < 0)
- goto scrub;
+ /* Enable supply if rail is enabled */
+ if (rdev->desc->ops->is_enabled &&
+ rdev->desc->ops->is_enabled(rdev)) {
+ ret = regulator_enable(rdev->supply);
+ if (ret < 0)
+ goto scrub;
+ }
}
/* add consumers devices */
- for (i = 0; i < init_data->num_consumer_supplies; i++) {
- ret = set_consumer_device_supply(rdev,
- init_data->consumer_supplies[i].dev,
- init_data->consumer_supplies[i].dev_name,
- init_data->consumer_supplies[i].supply);
- if (ret < 0)
- goto unset_supplies;
+ if (init_data) {
+ for (i = 0; i < init_data->num_consumer_supplies; i++) {
+ ret = set_consumer_device_supply(rdev,
+ init_data->consumer_supplies[i].dev_name,
+ init_data->consumer_supplies[i].supply);
+ if (ret < 0) {
+ dev_err(dev, "Failed to set supply %s\n",
+ init_data->consumer_supplies[i].supply);
+ goto unset_supplies;
+ }
+ }
}
list_add(&rdev->list, ®ulator_list);
unset_regulator_supplies(rdev);
scrub:
+ if (rdev->supply)
+ regulator_put(rdev->supply);
+ kfree(rdev->constraints);
device_unregister(&rdev->dev);
/* device core frees rdev */
rdev = ERR_PTR(ret);
if (rdev == NULL)
return;
+ if (rdev->supply)
+ regulator_put(rdev->supply);
mutex_lock(®ulator_list_mutex);
-#ifdef CONFIG_DEBUG_FS
debugfs_remove_recursive(rdev->debugfs);
-#endif
+ flush_work_sync(&rdev->disable_work.work);
WARN_ON(rdev->open_count);
unset_regulator_supplies(rdev);
list_del(&rdev->list);
- if (rdev->supply)
- sysfs_remove_link(&rdev->dev.kobj, "supply");
- device_unregister(&rdev->dev);
kfree(rdev->constraints);
+ device_unregister(&rdev->dev);
mutex_unlock(®ulator_list_mutex);
}
EXPORT_SYMBOL_GPL(regulator_unregister);
}
EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
+/**
+ * regulator_suspend_finish - resume regulators from system wide suspend
+ *
+ * Turn on regulators that might be turned off by regulator_suspend_prepare
+ * and that should be turned on according to the regulators properties.
+ */
+int regulator_suspend_finish(void)
+{
+ struct regulator_dev *rdev;
+ int ret = 0, error;
+
+ mutex_lock(®ulator_list_mutex);
+ list_for_each_entry(rdev, ®ulator_list, list) {
+ struct regulator_ops *ops = rdev->desc->ops;
+
+ mutex_lock(&rdev->mutex);
+ if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
+ ops->enable) {
+ error = ops->enable(rdev);
+ if (error)
+ ret = error;
+ } else {
+ if (!has_full_constraints)
+ goto unlock;
+ if (!ops->disable)
+ goto unlock;
+ if (ops->is_enabled && !ops->is_enabled(rdev))
+ goto unlock;
+
+ error = ops->disable(rdev);
+ if (error)
+ ret = error;
+ }
+unlock:
+ mutex_unlock(&rdev->mutex);
+ }
+ mutex_unlock(®ulator_list_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_suspend_finish);
+
/**
* regulator_has_full_constraints - the system has fully specified constraints
*
}
EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
+#ifdef CONFIG_DEBUG_FS
+static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ ssize_t len, ret = 0;
+ struct regulator_map *map;
+
+ if (!buf)
+ return -ENOMEM;
+
+ list_for_each_entry(map, ®ulator_map_list, list) {
+ len = snprintf(buf + ret, PAGE_SIZE - ret,
+ "%s -> %s.%s\n",
+ rdev_get_name(map->regulator), map->dev_name,
+ map->supply);
+ if (len >= 0)
+ ret += len;
+ if (ret > PAGE_SIZE) {
+ ret = PAGE_SIZE;
+ break;
+ }
+ }
+
+ ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+
+ kfree(buf);
+
+ return ret;
+}
+#endif
+
+static const struct file_operations supply_map_fops = {
+#ifdef CONFIG_DEBUG_FS
+ .read = supply_map_read_file,
+ .llseek = default_llseek,
+#endif
+};
+
static int __init regulator_init(void)
{
int ret;
ret = class_register(®ulator_class);
-#ifdef CONFIG_DEBUG_FS
debugfs_root = debugfs_create_dir("regulator", NULL);
- if (IS_ERR(debugfs_root) || !debugfs_root) {
+ if (!debugfs_root)
pr_warn("regulator: Failed to create debugfs directory\n");
- debugfs_root = NULL;
- }
-#endif
+
+ debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
+ &supply_map_fops);
regulator_dummy_init();
return 0;
}
+
+#ifdef CONFIG_DEBUG_FS
+static int regulator_syncevent(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct regulator_dev *rdev;
+ char buffer[40];
+ int buf_size;
+
+ memset(buffer, 0, sizeof(buffer));
+ buf_size = min(count, (sizeof(buffer)-1));
+
+ if (copy_from_user(buffer, user_buf, buf_size))
+ return -EFAULT;
+
+ if (!strnicmp("all", buffer, 3)) {
+
+ mutex_lock(®ulator_list_mutex);
+
+ list_for_each_entry(rdev, ®ulator_list, list) {
+ mutex_lock(&rdev->mutex);
+
+ if (_regulator_is_enabled(rdev))
+ trace_regulator_enable(rdev_get_name(rdev));
+ else
+ trace_regulator_disable(rdev_get_name(rdev));
+
+ trace_regulator_set_voltage(rdev_get_name(rdev),
+ _regulator_get_voltage(rdev),
+ _regulator_get_voltage(rdev));
+
+ mutex_unlock(&rdev->mutex);
+ }
+ }
+
+ mutex_unlock(®ulator_list_mutex);
+
+ return count;
+}
+
+static const struct file_operations regulator_syncevent_fops = {
+ .write = regulator_syncevent,
+};
+
+static int __init regulator_init_debugfs(void)
+{
+ debugfs_create_file("syncevent_regulators", S_IWUSR, NULL, NULL,
+ ®ulator_syncevent_fops);
+
+ return 0;
+}
+
+late_initcall(regulator_init_debugfs);
+#endif
+
late_initcall(regulator_init_complete);