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path: root/drivers/extcon/extcon-class.c
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Diffstat (limited to 'drivers/extcon/extcon-class.c')
-rw-r--r--drivers/extcon/extcon-class.c140
1 files changed, 80 insertions, 60 deletions
diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
index 946a3188b2b7..d398821097f3 100644
--- a/drivers/extcon/extcon-class.c
+++ b/drivers/extcon/extcon-class.c
@@ -41,7 +41,7 @@
* every single port-type of the following cable names. Please choose cable
* names that are actually used in your extcon device.
*/
-const char *extcon_cable_name[] = {
+const char extcon_cable_name[][CABLE_NAME_MAX + 1] = {
[EXTCON_USB] = "USB",
[EXTCON_USB_HOST] = "USB-Host",
[EXTCON_TA] = "TA",
@@ -62,8 +62,6 @@ const char *extcon_cable_name[] = {
[EXTCON_VIDEO_IN] = "Video-in",
[EXTCON_VIDEO_OUT] = "Video-out",
[EXTCON_MECHANICAL] = "Mechanical",
-
- NULL,
};
static struct class *extcon_class;
@@ -91,17 +89,13 @@ static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
return 0;
for (i = 0; edev->mutually_exclusive[i]; i++) {
- int count = 0, j;
+ int weight;
u32 correspondants = new_state & edev->mutually_exclusive[i];
- u32 exp = 1;
- for (j = 0; j < 32; j++) {
- if (exp & correspondants)
- count++;
- if (count > 1)
- return i + 1;
- exp <<= 1;
- }
+ /* calculate the total number of bits set */
+ weight = hweight32(correspondants);
+ if (weight > 1)
+ return i + 1;
}
return 0;
@@ -362,7 +356,7 @@ int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
EXPORT_SYMBOL_GPL(extcon_get_cable_state);
/**
- * extcon_get_cable_state_() - Set the status of a specific cable.
+ * extcon_set_cable_state_() - Set the status of a specific cable.
* @edev: the extcon device that has the cable.
* @index: cable index that can be retrieved by extcon_find_cable_index().
* @cable_state: the new cable status. The default semantics is
@@ -382,7 +376,7 @@ int extcon_set_cable_state_(struct extcon_dev *edev,
EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
/**
- * extcon_get_cable_state() - Set the status of a specific cable.
+ * extcon_set_cable_state() - Set the status of a specific cable.
* @edev: the extcon device that has the cable.
* @cable_name: cable name.
* @cable_state: the new cable status. The default semantics is
@@ -447,6 +441,8 @@ static int _call_per_cable(struct notifier_block *nb, unsigned long val,
* extcon device.
* @obj: an empty extcon_specific_cable_nb object to be returned.
* @extcon_name: the name of extcon device.
+ * if NULL, extcon_register_interest will register
+ * every cable with the target cable_name given.
* @cable_name: the target cable name.
* @nb: the notifier block to get notified.
*
@@ -466,22 +462,44 @@ int extcon_register_interest(struct extcon_specific_cable_nb *obj,
const char *extcon_name, const char *cable_name,
struct notifier_block *nb)
{
- if (!obj || !extcon_name || !cable_name || !nb)
+ if (!obj || !cable_name || !nb)
return -EINVAL;
- obj->edev = extcon_get_extcon_dev(extcon_name);
- if (!obj->edev)
- return -ENODEV;
+ if (extcon_name) {
+ obj->edev = extcon_get_extcon_dev(extcon_name);
+ if (!obj->edev)
+ return -ENODEV;
- obj->cable_index = extcon_find_cable_index(obj->edev, cable_name);
- if (obj->cable_index < 0)
- return -ENODEV;
+ obj->cable_index = extcon_find_cable_index(obj->edev, cable_name);
+ if (obj->cable_index < 0)
+ return -ENODEV;
+
+ obj->user_nb = nb;
+
+ obj->internal_nb.notifier_call = _call_per_cable;
+
+ return raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb);
+ } else {
+ struct class_dev_iter iter;
+ struct extcon_dev *extd;
+ struct device *dev;
+
+ if (!extcon_class)
+ return -ENODEV;
+ class_dev_iter_init(&iter, extcon_class, NULL, NULL);
+ while ((dev = class_dev_iter_next(&iter))) {
+ extd = (struct extcon_dev *)dev_get_drvdata(dev);
- obj->user_nb = nb;
+ if (extcon_find_cable_index(extd, cable_name) < 0)
+ continue;
- obj->internal_nb.notifier_call = _call_per_cable;
+ class_dev_iter_exit(&iter);
+ return extcon_register_interest(obj, extd->name,
+ cable_name, nb);
+ }
- return raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb);
+ return -ENODEV;
+ }
}
/**
@@ -551,43 +569,9 @@ static int create_extcon_class(void)
return 0;
}
-static void extcon_cleanup(struct extcon_dev *edev, bool skip)
-{
- mutex_lock(&extcon_dev_list_lock);
- list_del(&edev->entry);
- mutex_unlock(&extcon_dev_list_lock);
-
- if (!skip && get_device(edev->dev)) {
- int index;
-
- if (edev->mutually_exclusive && edev->max_supported) {
- for (index = 0; edev->mutually_exclusive[index];
- index++)
- kfree(edev->d_attrs_muex[index].attr.name);
- kfree(edev->d_attrs_muex);
- kfree(edev->attrs_muex);
- }
-
- for (index = 0; index < edev->max_supported; index++)
- kfree(edev->cables[index].attr_g.name);
-
- if (edev->max_supported) {
- kfree(edev->extcon_dev_type.groups);
- kfree(edev->cables);
- }
-
- device_unregister(edev->dev);
- put_device(edev->dev);
- }
-
- kfree(edev->dev);
-}
-
static void extcon_dev_release(struct device *dev)
{
- struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev);
-
- extcon_cleanup(edev, true);
+ kfree(dev);
}
static const char *muex_name = "mutually_exclusive";
@@ -813,7 +797,40 @@ EXPORT_SYMBOL_GPL(extcon_dev_register);
*/
void extcon_dev_unregister(struct extcon_dev *edev)
{
- extcon_cleanup(edev, false);
+ int index;
+
+ mutex_lock(&extcon_dev_list_lock);
+ list_del(&edev->entry);
+ mutex_unlock(&extcon_dev_list_lock);
+
+ if (IS_ERR_OR_NULL(get_device(edev->dev))) {
+ dev_err(edev->dev, "Failed to unregister extcon_dev (%s)\n",
+ dev_name(edev->dev));
+ return;
+ }
+
+ if (edev->mutually_exclusive && edev->max_supported) {
+ for (index = 0; edev->mutually_exclusive[index];
+ index++)
+ kfree(edev->d_attrs_muex[index].attr.name);
+ kfree(edev->d_attrs_muex);
+ kfree(edev->attrs_muex);
+ }
+
+ for (index = 0; index < edev->max_supported; index++)
+ kfree(edev->cables[index].attr_g.name);
+
+ if (edev->max_supported) {
+ kfree(edev->extcon_dev_type.groups);
+ kfree(edev->cables);
+ }
+
+#if defined(CONFIG_ANDROID)
+ if (switch_class)
+ class_compat_remove_link(switch_class, edev->dev, NULL);
+#endif
+ device_unregister(edev->dev);
+ put_device(edev->dev);
}
EXPORT_SYMBOL_GPL(extcon_dev_unregister);
@@ -825,6 +842,9 @@ module_init(extcon_class_init);
static void __exit extcon_class_exit(void)
{
+#if defined(CONFIG_ANDROID)
+ class_compat_unregister(switch_class);
+#endif
class_destroy(extcon_class);
}
module_exit(extcon_class_exit);
generated by cgit v1.2.3-70-g09d2 (git 2.51.1) at 2025-11-04 14:46:21 +0000