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Merge remote-tracking branch 'regulator/topic/list' into regulator-next

This commit is contained in:
Mark Brown 2015-11-04 11:19:36 +00:00
parent ce3c059731 85f3b43116
commit 5408dd8f09
1 changed files with 167 additions and 94 deletions
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261
drivers/regulator/core.c
View File

@ -51,7 +51,6 @@
pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
static DEFINE_MUTEX(regulator_list_mutex);
static LIST_HEAD(regulator_list);
static LIST_HEAD(regulator_map_list);
static LIST_HEAD(regulator_ena_gpio_list);
static LIST_HEAD(regulator_supply_alias_list);
@ -59,6 +58,8 @@ static bool has_full_constraints;
static struct dentry *debugfs_root;
static struct class regulator_class;
/*
* struct regulator_map
*
@ -1325,6 +1326,47 @@ static void regulator_supply_alias(struct device **dev, const char **supply)
}
}
static int of_node_match(struct device *dev, const void *data)
{
return dev->of_node == data;
}
static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
{
struct device *dev;
dev = class_find_device(&regulator_class, NULL, np, of_node_match);
return dev ? dev_to_rdev(dev) : NULL;
}
static int regulator_match(struct device *dev, const void *data)
{
struct regulator_dev *r = dev_to_rdev(dev);
return strcmp(rdev_get_name(r), data) == 0;
}
static struct regulator_dev *regulator_lookup_by_name(const char *name)
{
struct device *dev;
dev = class_find_device(&regulator_class, NULL, name, regulator_match);
return dev ? dev_to_rdev(dev) : NULL;
}
/**
* regulator_dev_lookup - lookup a regulator device.
* @dev: device for regulator "consumer".
* @supply: Supply name or regulator ID.
* @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
* lookup could succeed in the future.
*
* If successful, returns a struct regulator_dev that corresponds to the name
* @supply and with the embedded struct device refcount incremented by one,
* or NULL on failure. The refcount must be dropped by calling put_device().
*/
static struct regulator_dev *regulator_dev_lookup(struct device *dev,
const char *supply,
int *ret)
@ -1340,10 +1382,9 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
if (dev && dev->of_node) {
node = of_get_regulator(dev, supply);
if (node) {
list_for_each_entry(r, &regulator_list, list)
if (r->dev.parent &&
node == r->dev.of_node)
return r;
r = of_find_regulator_by_node(node);
if (r)
return r;
*ret = -EPROBE_DEFER;
return NULL;
} else {
@ -1361,20 +1402,24 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
if (dev)
devname = dev_name(dev);
list_for_each_entry(r, &regulator_list, list)
if (strcmp(rdev_get_name(r), supply) == 0)
return r;
r = regulator_lookup_by_name(supply);
if (r)
return r;
mutex_lock(&regulator_list_mutex);
list_for_each_entry(map, &regulator_map_list, list) {
/* If the mapping has a device set up it must match */
if (map->dev_name &&
(!devname || strcmp(map->dev_name, devname)))
continue;
if (strcmp(map->supply, supply) == 0)
if (strcmp(map->supply, supply) == 0 &&
get_device(&map->regulator->dev)) {
mutex_unlock(&regulator_list_mutex);
return map->regulator;
}
}
mutex_unlock(&regulator_list_mutex);
return NULL;
}
@ -1409,6 +1454,7 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
if (have_full_constraints()) {
r = dummy_regulator_rdev;
get_device(&r->dev);
} else {
dev_err(dev, "Failed to resolve %s-supply for %s\n",
rdev->supply_name, rdev->desc->name);
@ -1418,12 +1464,16 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
/* Recursively resolve the supply of the supply */
ret = regulator_resolve_supply(r);
if (ret < 0)
if (ret < 0) {
put_device(&r->dev);
return ret;
}
ret = set_supply(rdev, r);
if (ret < 0)
if (ret < 0) {
put_device(&r->dev);
return ret;
}
/* Cascade always-on state to supply */
if (_regulator_is_enabled(rdev) && rdev->supply) {
@ -1459,8 +1509,6 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
else
ret = -EPROBE_DEFER;
mutex_lock(&regulator_list_mutex);
rdev = regulator_dev_lookup(dev, id, &ret);
if (rdev)
goto found;
@ -1472,7 +1520,7 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
* succeed, so, quit with appropriate error value
*/
if (ret && ret != -ENODEV)
goto out;
return regulator;
if (!devname)
devname = "deviceless";
@ -1486,40 +1534,46 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
devname, id);
rdev = dummy_regulator_rdev;
get_device(&rdev->dev);
goto found;
/* Don't log an error when called from regulator_get_optional() */
} else if (!have_full_constraints() || exclusive) {
dev_warn(dev, "dummy supplies not allowed\n");
}
mutex_unlock(&regulator_list_mutex);
return regulator;
found:
if (rdev->exclusive) {
regulator = ERR_PTR(-EPERM);
goto out;
put_device(&rdev->dev);
return regulator;
}
if (exclusive && rdev->open_count) {
regulator = ERR_PTR(-EBUSY);
goto out;
put_device(&rdev->dev);
return regulator;
}
ret = regulator_resolve_supply(rdev);
if (ret < 0) {
regulator = ERR_PTR(ret);
goto out;
put_device(&rdev->dev);
return regulator;
}
if (!try_module_get(rdev->owner))
goto out;
if (!try_module_get(rdev->owner)) {
put_device(&rdev->dev);
return regulator;
}
regulator = create_regulator(rdev, dev, id);
if (regulator == NULL) {
regulator = ERR_PTR(-ENOMEM);
put_device(&rdev->dev);
module_put(rdev->owner);
goto out;
return regulator;
}
rdev->open_count++;
@ -1533,9 +1587,6 @@ found:
rdev->use_count = 0;
}
out:
mutex_unlock(&regulator_list_mutex);
return regulator;
}
@ -1633,6 +1684,7 @@ static void _regulator_put(struct regulator *regulator)
rdev->open_count--;
rdev->exclusive = 0;
put_device(&rdev->dev);
mutex_unlock(&rdev->mutex);
kfree(regulator->supply_name);
@ -3810,8 +3862,6 @@ regulator_register(const struct regulator_desc *regulator_desc,
}
}
list_add(&rdev->list, &regulator_list);
rdev_init_debugfs(rdev);
out:
mutex_unlock(&regulator_list_mutex);
@ -3865,6 +3915,19 @@ void regulator_unregister(struct regulator_dev *rdev)
}
EXPORT_SYMBOL_GPL(regulator_unregister);
static int _regulator_suspend_prepare(struct device *dev, void *data)
{
struct regulator_dev *rdev = dev_to_rdev(dev);
const suspend_state_t *state = data;
int ret;
mutex_lock(&rdev->mutex);
ret = suspend_prepare(rdev, *state);
mutex_unlock(&rdev->mutex);
return ret;
}
/**
* regulator_suspend_prepare - prepare regulators for system wide suspend
* @state: system suspend state
@ -3874,31 +3937,46 @@ EXPORT_SYMBOL_GPL(regulator_unregister);
*/
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(&regulator_list_mutex);
list_for_each_entry(rdev, &regulator_list, list) {
mutex_lock(&rdev->mutex);
ret = suspend_prepare(rdev, state);
mutex_unlock(&rdev->mutex);
if (ret < 0) {
rdev_err(rdev, "failed to prepare\n");
goto out;
}
}
out:
mutex_unlock(&regulator_list_mutex);
return ret;
return class_for_each_device(&regulator_class, NULL, &state,
_regulator_suspend_prepare);
}
EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
static int _regulator_suspend_finish(struct device *dev, void *data)
{
struct regulator_dev *rdev = dev_to_rdev(dev);
int ret;
mutex_lock(&rdev->mutex);
if (rdev->use_count > 0 || rdev->constraints->always_on) {
if (!_regulator_is_enabled(rdev)) {
ret = _regulator_do_enable(rdev);
if (ret)
dev_err(dev,
"Failed to resume regulator %d\n",
ret);
}
} else {
if (!have_full_constraints())
goto unlock;
if (!_regulator_is_enabled(rdev))
goto unlock;
ret = _regulator_do_disable(rdev);
if (ret)
dev_err(dev, "Failed to suspend regulator %d\n", ret);
}
unlock:
mutex_unlock(&rdev->mutex);
/* Keep processing regulators in spite of any errors */
return 0;
}
/**
* regulator_suspend_finish - resume regulators from system wide suspend
*
@ -3907,33 +3985,8 @@ EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
*/
int regulator_suspend_finish(void)
{
struct regulator_dev *rdev;
int ret = 0, error;
mutex_lock(&regulator_list_mutex);
list_for_each_entry(rdev, &regulator_list, list) {
mutex_lock(&rdev->mutex);
if (rdev->use_count > 0 || rdev->constraints->always_on) {
if (!_regulator_is_enabled(rdev)) {
error = _regulator_do_enable(rdev);
if (error)
ret = error;
}
} else {
if (!have_full_constraints())
goto unlock;
if (!_regulator_is_enabled(rdev))
goto unlock;
error = _regulator_do_disable(rdev);
if (error)
ret = error;
}
unlock:
mutex_unlock(&rdev->mutex);
}
mutex_unlock(&regulator_list_mutex);
return ret;
return class_for_each_device(&regulator_class, NULL, NULL,
_regulator_suspend_finish);
}
EXPORT_SYMBOL_GPL(regulator_suspend_finish);
@ -4053,14 +4106,35 @@ static const struct file_operations supply_map_fops = {
};
#ifdef CONFIG_DEBUG_FS
struct summary_data {
struct seq_file *s;
struct regulator_dev *parent;
int level;
};
static void regulator_summary_show_subtree(struct seq_file *s,
struct regulator_dev *rdev,
int level);
static int regulator_summary_show_children(struct device *dev, void *data)
{
struct regulator_dev *rdev = dev_to_rdev(dev);
struct summary_data *summary_data = data;
if (rdev->supply && rdev->supply->rdev == summary_data->parent)
regulator_summary_show_subtree(summary_data->s, rdev,
summary_data->level + 1);
return 0;
}
static void regulator_summary_show_subtree(struct seq_file *s,
struct regulator_dev *rdev,
int level)
{
struct list_head *list = s->private;
struct regulator_dev *child;
struct regulation_constraints *c;
struct regulator *consumer;
struct summary_data summary_data;
if (!rdev)
return;
@ -4110,33 +4184,32 @@ static void regulator_summary_show_subtree(struct seq_file *s,
seq_puts(s, "\n");
}
list_for_each_entry(child, list, list) {
/* handle only non-root regulators supplied by current rdev */
if (!child->supply || child->supply->rdev != rdev)
continue;
summary_data.s = s;
summary_data.level = level;
summary_data.parent = rdev;
regulator_summary_show_subtree(s, child, level + 1);
}
class_for_each_device(&regulator_class, NULL, &summary_data,
regulator_summary_show_children);
}
static int regulator_summary_show_roots(struct device *dev, void *data)
{
struct regulator_dev *rdev = dev_to_rdev(dev);
struct seq_file *s = data;
if (!rdev->supply)
regulator_summary_show_subtree(s, rdev, 0);
return 0;
}
static int regulator_summary_show(struct seq_file *s, void *data)
{
struct list_head *list = s->private;
struct regulator_dev *rdev;
seq_puts(s, " regulator use open bypass voltage current min max\n");
seq_puts(s, "-------------------------------------------------------------------------------\n");
mutex_lock(&regulator_list_mutex);
list_for_each_entry(rdev, list, list) {
if (rdev->supply)
continue;
regulator_summary_show_subtree(s, rdev, 0);
}
mutex_unlock(&regulator_list_mutex);
class_for_each_device(&regulator_class, NULL, s,
regulator_summary_show_roots);
return 0;
}
@ -4170,7 +4243,7 @@ static int __init regulator_init(void)
&supply_map_fops);
debugfs_create_file("regulator_summary", 0444, debugfs_root,
&regulator_list, &regulator_summary_fops);
NULL, &regulator_summary_fops);
regulator_dummy_init();