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path: root/drivers/extcon
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Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 37fa4b51c5a1..599fc377a965 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -201,6 +201,11 @@ struct extcon_cable {
union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
+
+ unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)];
+ unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)];
+ unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)];
+ unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)];
};
static struct class *extcon_class;
@@ -297,6 +302,39 @@ static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
return !!(extcon_info[id].type & type);
}
+static int is_extcon_property_capability(struct extcon_dev *edev,
+ unsigned int id, int index,unsigned int prop)
+{
+ struct extcon_cable *cable;
+ int type, ret;
+
+ /* Check whether the property is supported or not. */
+ type = get_extcon_type(prop);
+ if (type < 0)
+ return type;
+
+ cable = &edev->cables[index];
+
+ switch (type) {
+ case EXTCON_TYPE_USB:
+ ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
+ break;
+ case EXTCON_TYPE_CHG:
+ ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
+ break;
+ case EXTCON_TYPE_JACK:
+ ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
+ break;
+ case EXTCON_TYPE_DISP:
+ ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
static void init_property(struct extcon_dev *edev, unsigned int id, int index)
{
unsigned int type = extcon_info[id].type;
@@ -554,6 +592,12 @@ int extcon_get_property(struct extcon_dev *edev, unsigned int id,
spin_lock_irqsave(&edev->lock, flags);
+ /* Check whether the property is available or not. */
+ if (!is_extcon_property_capability(edev, id, index, prop)) {
+ spin_unlock_irqrestore(&edev->lock, flags);
+ return -EPERM;
+ }
+
/*
* Check whether the external connector is attached.
* If external connector is detached, the user can not
@@ -626,6 +670,12 @@ int extcon_set_property(struct extcon_dev *edev, unsigned int id,
spin_lock_irqsave(&edev->lock, flags);
+ /* Check whether the property is available or not. */
+ if (!is_extcon_property_capability(edev, id, index, prop)) {
+ spin_unlock_irqrestore(&edev->lock, flags);
+ return -EPERM;
+ }
+
cable = &edev->cables[index];
/* Set the property value according to extcon type */
@@ -654,6 +704,96 @@ int extcon_set_property(struct extcon_dev *edev, unsigned int id,
EXPORT_SYMBOL_GPL(extcon_set_property);
/**
+ * extcon_get_property_capability() - Get the capability of property
+ * of an external connector.
+ * @edev: the extcon device that has the cable.
+ * @id: the unique id of each external connector
+ * in extcon enumeration.
+ * @prop: the property id among enum extcon_property.
+ *
+ * Returns 1 if the property is available or 0 if not available.
+ */
+int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
+ unsigned int prop)
+{
+ int index;
+
+ if (!edev)
+ return -EINVAL;
+
+ /* Check whether the property is supported or not */
+ if (!is_extcon_property_supported(id, prop))
+ return -EINVAL;
+
+ /* Find the cable index of external connector by using id */
+ index = find_cable_index_by_id(edev, id);
+ if (index < 0)
+ return index;
+
+ return is_extcon_property_capability(edev, id, index, prop);
+}
+EXPORT_SYMBOL_GPL(extcon_get_property_capability);
+
+/**
+ * extcon_set_property_capability() - Set the capability of a property
+ * of an external connector.
+ * @edev: the extcon device that has the cable.
+ * @id: the unique id of each external connector
+ * in extcon enumeration.
+ * @prop: the property id among enum extcon_property.
+ *
+ * This function set the capability of a property for an external connector
+ * to mark the bit in capability bitmap which mean the available state of
+ * a property.
+ *
+ * Returns 0 if success or error number if fail
+ */
+int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
+ unsigned int prop)
+{
+ struct extcon_cable *cable;
+ int index, type, ret = 0;
+
+ if (!edev)
+ return -EINVAL;
+
+ /* Check whether the property is supported or not. */
+ if (!is_extcon_property_supported(id, prop))
+ return -EINVAL;
+
+ /* Find the cable index of external connector by using id. */
+ index = find_cable_index_by_id(edev, id);
+ if (index < 0)
+ return index;
+
+ type = get_extcon_type(prop);
+ if (type < 0)
+ return type;
+
+ cable = &edev->cables[index];
+
+ switch (type) {
+ case EXTCON_TYPE_USB:
+ __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
+ break;
+ case EXTCON_TYPE_CHG:
+ __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
+ break;
+ case EXTCON_TYPE_JACK:
+ __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
+ break;
+ case EXTCON_TYPE_DISP:
+ __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(extcon_set_property_capability);
+
+/**
* extcon_get_extcon_dev() - Get the extcon device instance from the name
* @extcon_name: The extcon name provided with extcon_dev_register()
*/