#include <linux/kernel.h>
#include <linux/init.h>
+#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/err.h>
static DEFINE_MUTEX(regulator_list_mutex);
static LIST_HEAD(regulator_list);
static LIST_HEAD(regulator_map_list);
-static int has_full_constraints;
+static bool has_full_constraints;
static bool board_wants_dummy_regulator;
+#ifdef CONFIG_DEBUG_FS
+static struct dentry *debugfs_root;
+#endif
+
/*
* struct regulator_map
*
static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
static void _notifier_call_chain(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 const char *rdev_get_name(struct regulator_dev *rdev)
{
err = regulator_check_drms(rdev);
if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
- !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode)
+ (!rdev->desc->ops->get_voltage &&
+ !rdev->desc->ops->get_voltage_sel) ||
+ !rdev->desc->ops->set_mode)
return;
/* get output voltage */
if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
count += sprintf(buf + count, "standby");
- rdev_info(rdev, "regulator: %s\n", buf);
+ rdev_info(rdev, "%s\n", buf);
}
static int machine_constraints_voltage(struct regulator_dev *rdev,
{
struct regulator_ops *ops = rdev->desc->ops;
int ret;
- unsigned selector;
/* do we need to apply the constraint voltage */
if (rdev->constraints->apply_uV &&
- rdev->constraints->min_uV == rdev->constraints->max_uV &&
- ops->set_voltage) {
- ret = ops->set_voltage(rdev,
- rdev->constraints->min_uV,
- rdev->constraints->max_uV,
- &selector);
- if (ret < 0) {
- rdev_err(rdev, "failed to apply %duV constraint\n",
- rdev->constraints->min_uV);
- rdev->constraints = NULL;
- return ret;
- }
+ rdev->constraints->min_uV == rdev->constraints->max_uV) {
+ ret = _regulator_do_set_voltage(rdev,
+ rdev->constraints->min_uV,
+ rdev->constraints->max_uV);
+ if (ret < 0) {
+ rdev_err(rdev, "failed to apply %duV constraint\n",
+ rdev->constraints->min_uV);
+ rdev->constraints = NULL;
+ return ret;
+ }
}
/* constrain machine-level voltage specs to fit
return 0;
}
+static int _regulator_do_set_voltage(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ int ret;
+ unsigned int selector;
+
+ trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
+
+ if (rdev->desc->ops->set_voltage) {
+ ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
+ &selector);
+
+ if (rdev->desc->ops->list_voltage)
+ selector = rdev->desc->ops->list_voltage(rdev,
+ selector);
+ else
+ selector = -1;
+ } else if (rdev->desc->ops->set_voltage_sel) {
+ int best_val = INT_MAX;
+ int i;
+
+ selector = 0;
+
+ /* Find the smallest voltage that falls within the specified
+ * range.
+ */
+ for (i = 0; i < rdev->desc->n_voltages; i++) {
+ ret = rdev->desc->ops->list_voltage(rdev, i);
+ if (ret < 0)
+ continue;
+
+ if (ret < best_val && ret >= min_uV && ret <= max_uV) {
+ best_val = ret;
+ selector = i;
+ }
+ }
+
+ if (best_val != INT_MAX) {
+ ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
+ selector = best_val;
+ } else {
+ ret = -EINVAL;
+ }
+ } else {
+ ret = -EINVAL;
+ }
+
+ if (ret == 0)
+ _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
+ NULL);
+
+ trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector);
+
+ return ret;
+}
+
/**
* regulator_set_voltage - set regulator output voltage
* @regulator: regulator source
int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
{
struct regulator_dev *rdev = regulator->rdev;
- int ret;
- unsigned selector;
+ int ret = 0;
mutex_lock(&rdev->mutex);
+ /* If we're setting the same range as last time the change
+ * should be a noop (some cpufreq implementations use the same
+ * voltage for multiple frequencies, for example).
+ */
+ if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
+ goto out;
+
/* sanity check */
- if (!rdev->desc->ops->set_voltage) {
+ if (!rdev->desc->ops->set_voltage &&
+ !rdev->desc->ops->set_voltage_sel) {
ret = -EINVAL;
goto out;
}
if (ret < 0)
goto out;
- trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
+ ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
- ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, &selector);
+out:
+ mutex_unlock(&rdev->mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_set_voltage);
- if (rdev->desc->ops->list_voltage)
- selector = rdev->desc->ops->list_voltage(rdev, selector);
- else
- selector = -1;
+/**
+ * regulator_sync_voltage - re-apply last regulator output voltage
+ * @regulator: regulator source
+ *
+ * Re-apply the last configured voltage. This is intended to be used
+ * where some external control source the consumer is cooperating with
+ * has caused the configured voltage to change.
+ */
+int regulator_sync_voltage(struct regulator *regulator)
+{
+ struct regulator_dev *rdev = regulator->rdev;
+ int ret, min_uV, max_uV;
- trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector);
+ mutex_lock(&rdev->mutex);
+
+ if (!rdev->desc->ops->set_voltage &&
+ !rdev->desc->ops->set_voltage_sel) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* This is only going to work if we've had a voltage configured. */
+ if (!regulator->min_uV && !regulator->max_uV) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ min_uV = regulator->min_uV;
+ max_uV = regulator->max_uV;
+
+ /* This should be a paranoia check... */
+ ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
+ if (ret < 0)
+ goto out;
+
+ ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
+ if (ret < 0)
+ goto out;
+
+ ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
out:
- _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
mutex_unlock(&rdev->mutex);
return ret;
}
-EXPORT_SYMBOL_GPL(regulator_set_voltage);
+EXPORT_SYMBOL_GPL(regulator_sync_voltage);
static int _regulator_get_voltage(struct regulator_dev *rdev)
{
- /* sanity check */
+ int sel;
+
+ 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
int status = 0;
/* some attributes need specific methods to be displayed */
- if (ops->get_voltage) {
+ if (ops->get_voltage || ops->get_voltage_sel) {
status = device_create_file(dev, &dev_attr_microvolts);
if (status < 0)
return status;
return status;
/* constraints need specific supporting methods */
- if (ops->set_voltage) {
+ if (ops->set_voltage || ops->set_voltage_sel) {
status = device_create_file(dev, &dev_attr_min_microvolts);
if (status < 0)
return status;
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) {
+ rdev_warn(rdev, "Failed to create debugfs directory\n");
+ rdev->debugfs = NULL;
+ return;
+ }
+
+ debugfs_create_u32("use_count", 0444, rdev->debugfs,
+ &rdev->use_count);
+ debugfs_create_u32("open_count", 0444, rdev->debugfs,
+ &rdev->open_count);
+#endif
+}
+
/**
* regulator_register - register regulator
* @regulator_desc: regulator to register
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);
+ WARN_ON(regulator_desc->ops->set_voltage &&
+ regulator_desc->ops->set_voltage_sel);
+
+ /* If we're using selectors we must implement list_voltage. */
+ if (regulator_desc->ops->get_voltage_sel &&
+ !regulator_desc->ops->list_voltage) {
+ return ERR_PTR(-EINVAL);
+ }
+ if (regulator_desc->ops->set_voltage_sel &&
+ !regulator_desc->ops->list_voltage) {
+ return ERR_PTR(-EINVAL);
+ }
+
rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
if (rdev == NULL)
return ERR_PTR(-ENOMEM);
}
list_add(&rdev->list, ®ulator_list);
+
+ rdev_init_debugfs(rdev);
out:
mutex_unlock(®ulator_list_mutex);
return rdev;
return;
mutex_lock(®ulator_list_mutex);
+#ifdef CONFIG_DEBUG_FS
+ debugfs_remove_recursive(rdev->debugfs);
+#endif
WARN_ON(rdev->open_count);
unset_regulator_supplies(rdev);
list_del(&rdev->list);
ret = class_register(®ulator_class);
+#ifdef CONFIG_DEBUG_FS
+ debugfs_root = debugfs_create_dir("regulator", NULL);
+ if (IS_ERR(debugfs_root) || !debugfs_root) {
+ pr_warn("regulator: Failed to create debugfs directory\n");
+ debugfs_root = NULL;
+ }
+#endif
+
regulator_dummy_init();
return ret;
git.openpandora.org / pandora-kernel.git / blobdiff