On Mon, Feb 13, 2023, Elson Roy Serrao wrote:
> 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@xxxxxxxxxxx>
> ---
> drivers/usb/gadget/composite.c | 24 ++++++++++++++++++++++++
> drivers/usb/gadget/udc/core.c | 21 +++++++++++++++++++++
> include/linux/usb/composite.h | 6 ++++++
> include/linux/usb/gadget.h | 4 ++++
> 4 files changed, 55 insertions(+)
>
> diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
> index a37a8f4..51d6ee9 100644
> --- a/drivers/usb/gadget/composite.c
> +++ b/drivers/usb/gadget/composite.c
> @@ -492,6 +492,30 @@ 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_wakeup_armed) {
> + ERROR(func->config->cdev, "not armed for func remote wakeup\n");
> + return -EINVAL;
> + }
> +
> + 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);
The print of id here is always MAX_CONFIG_INTERFACES right?
Thanks,
Thinh
> + return -EINVAL;
> + }
> +
> + ret = usb_gadget_func_wakeup(func->config->cdev->gadget, id);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(usb_func_wakeup);
> +
