From 02ded1b0d8e73dad7d2626c960ef20fb7dc30753 Mon Sep 17 00:00:00 2001 From: Robert Baldyga Date: Tue, 28 Jul 2015 07:19:59 +0200 Subject: [PATCH] usb: gadget: add 'quirk_stall_not_supp' to usb_gadget Due to some UDC controllers may not support stalling, usb gadget layer needs to provide a generic way to inform gadget functions about non-standard hardware limitations. This patch adds 'quirk_stall_not_supp' field to struct usb_gadget and helper function gadget_is_stall_supported(). It also sets 'quirk_stall_not_supp' to 1 in at91_udc driver, which has such limitation. Signed-off-by: Robert Baldyga Signed-off-by: Felipe Balbi --- drivers/usb/gadget/udc/at91_udc.c | 1 + include/linux/usb/gadget.h | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/drivers/usb/gadget/udc/at91_udc.c b/drivers/usb/gadget/udc/at91_udc.c index fc4226462f8f..32f50a7944dd 100644 --- a/drivers/usb/gadget/udc/at91_udc.c +++ b/drivers/usb/gadget/udc/at91_udc.c @@ -825,6 +825,7 @@ static void udc_reinit(struct at91_udc *udc) INIT_LIST_HEAD(&udc->gadget.ep_list); INIT_LIST_HEAD(&udc->gadget.ep0->ep_list); + udc->gadget.quirk_stall_not_supp = 1; for (i = 0; i < NUM_ENDPOINTS; i++) { struct at91_ep *ep = &udc->ep[i]; diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 31be84b7e645..f195a76548f6 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -573,6 +573,7 @@ struct usb_gadget { unsigned a_alt_hnp_support:1; unsigned quirk_ep_out_aligned_size:1; unsigned quirk_altset_not_supp:1; + unsigned quirk_stall_not_supp:1; unsigned is_selfpowered:1; unsigned deactivated:1; unsigned connected:1; @@ -620,6 +621,15 @@ static inline int gadget_is_altset_supported(struct usb_gadget *g) return !g->quirk_altset_not_supp; } +/** + * gadget_is_stall_supported - return true iff the hardware supports stalling + * @g: controller to check for quirk + */ +static inline int gadget_is_stall_supported(struct usb_gadget *g) +{ + return !g->quirk_stall_not_supp; +} + /** * gadget_is_dualspeed - return true iff the hardware handles high speed * @g: controller that might support both high and full speeds -- 2.20.1