@@ -490,6 +490,32 @@ int usb_interface_id(struct usb_configuration *config,
}
EXPORT_SYMBOL_GPL(usb_interface_id);
+int usb_func_wakeup(struct usb_function *func)
+{
+ int ret, id;
+
+ if (!func->func_rw_armed) {
+ ERROR(func->config->cdev, "func remote wakeup not enabled\n");
+ return -EINVAL;
+ }
+
+ DBG(func->config->cdev, "%s function wakeup\n", func->name);
+
+ for (id = 0; id < MAX_CONFIG_INTERFACES; id++)
+ if (func->config->interface[id] == func)
+ break;
+
+ if (id == MAX_CONFIG_INTERFACES) {
+ ERROR(func->config->cdev, "Invalid function id:%d\n", id);
+ return -EINVAL;
+ }
+
+ ret = usb_gadget_func_wakeup(func->config->cdev->gadget, id);
+
+ return ret;
+}
+EXPORT_SYMBOL(usb_func_wakeup);
+
static u8 encode_bMaxPower(enum usb_device_speed speed,
struct usb_configuration *c)
{
@@ -819,6 +819,25 @@ int usb_gadget_activate(struct usb_gadget *gadget)
}
EXPORT_SYMBOL_GPL(usb_gadget_activate);
+/**
+ * usb_gadget_func_wakeup - sends function wake notification to the host.
+ * If the link is in low power state, first brings the link to active state.
+ * @gadget: controller used to wake up the host
+ * @interface_id: interface on which function wake notification is sent.
+ *
+ * Returns zero on success, else negative error code if the hardware
+ * doesn't support such attempts. Drivers must return device descriptors that
+ * report their ability to support this, or hosts won't enable it.
+ */
+int usb_gadget_func_wakeup(struct usb_gadget *gadget, int interface_id)
+{
+ if (!gadget->ops->func_wakeup)
+ return -EOPNOTSUPP;
+
+ return gadget->ops->func_wakeup(gadget, interface_id);
+}
+EXPORT_SYMBOL_GPL(usb_gadget_func_wakeup);
+
/* ------------------------------------------------------------------------- */
#ifdef CONFIG_HAS_DMA
@@ -149,6 +149,9 @@ struct usb_os_desc_table {
* GetStatus() request when the recipient is Interface.
* @func_suspend: callback to be called when
* SetFeature(FUNCTION_SUSPEND) is reseived
+ * @func_suspended: Indicates whether the function is in function suspend state.
+ * @func_rw_armed: Indicates whether the function is armed by the host for
+ * wakeup signaling.
*
* A single USB function uses one or more interfaces, and should in most
* cases support operation at both full and high speeds. Each function is
@@ -219,6 +222,8 @@ struct usb_function {
int (*get_status)(struct usb_function *);
int (*func_suspend)(struct usb_function *,
u8 suspend_opt);
+ bool func_suspended;
+ bool func_rw_armed;
/* private: */
/* internals */
struct list_head list;
@@ -240,6 +245,7 @@ int config_ep_by_speed_and_alt(struct usb_gadget *g, struct usb_function *f,
int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f,
struct usb_ep *_ep);
+int usb_func_wakeup(struct usb_function *func);
#define MAX_CONFIG_INTERFACES 16 /* arbitrary; max 255 */
@@ -309,6 +309,7 @@ struct usb_udc;
struct usb_gadget_ops {
int (*get_frame)(struct usb_gadget *);
int (*wakeup)(struct usb_gadget *);
+ int (*func_wakeup)(struct usb_gadget *gadget, int interface_id);
int (*set_selfpowered) (struct usb_gadget *, int is_selfpowered);
int (*vbus_session) (struct usb_gadget *, int is_active);
int (*vbus_draw) (struct usb_gadget *, unsigned mA);
@@ -612,6 +613,7 @@ int usb_gadget_disconnect(struct usb_gadget *gadget);
int usb_gadget_deactivate(struct usb_gadget *gadget);
int usb_gadget_activate(struct usb_gadget *gadget);
int usb_gadget_check_config(struct usb_gadget *gadget);
+int usb_gadget_func_wakeup(struct usb_gadget *gadget, int interface_id);
#else
static inline int usb_gadget_frame_number(struct usb_gadget *gadget)
{ return 0; }
A function which is in function suspend state has to send a function wake notification to the host in case it needs to exit from this state and resume data transfer. Add support to handle such requests by exposing a new gadget op. Signed-off-by: Elson Roy Serrao <quic_eserrao@quicinc.com> --- drivers/usb/gadget/composite.c | 26 ++++++++++++++++++++++++++ drivers/usb/gadget/udc/core.c | 19 +++++++++++++++++++ include/linux/usb/composite.h | 6 ++++++ include/linux/usb/gadget.h | 2 ++ 4 files changed, 53 insertions(+)