usb: gadget: add streams support to the gadget framework

This patch defines necessary fields to support
streaming for USB3.0.

It implements a new function, called
usb_ep_autoconfig_ss(), to be used instead of the
existing usb_ep_autoconfig() when working in
SuperSpeed mode and there is a need to search for
an endpoint according to the number of required
streams.

[ balbi@ti.com : slight changes to commit log ]

Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index d22b4a4936cb..625971292c20 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -28,6 +28,7 @@ struct usb_ep;
  *      field, and the usb controller needs one, it is responsible
  *      for mapping and unmapping the buffer.
  * @length: Length of that data
+ * @stream_id: The stream id, when USB3.0 bulk streams are being used
  * @no_interrupt: If true, hints that no completion irq is needed.
  *      Helpful sometimes with deep request queues that are handled
  *      directly by DMA controllers.
@@ -82,6 +83,7 @@ struct usb_request {
         unsigned                length;
         dma_addr_t              dma;
 
+        unsigned                stream_id:16;
         unsigned                no_interrupt:1;
         unsigned                zero:1;
         unsigned                short_not_ok:1;
@@ -132,11 +134,15 @@ struct usb_ep_ops {
  * @maxpacket:The maximum packet size used on this endpoint.  The initial
  *      value can sometimes be reduced (hardware allowing), according to
  *      the endpoint descriptor used to configure the endpoint.
+ * @max_streams: The maximum number of streams supported
+ *      by this EP (0 - 16, actual number is 2^n)
  * @driver_data:for use by the gadget driver.
  * @address: used to identify the endpoint when finding descriptor that
  *      matches connection speed
  * @desc: endpoint descriptor.  This pointer is set before the endpoint is
  *      enabled and remains valid until the endpoint is disabled.
+ * @comp_desc: In case of SuperSpeed support, this is the endpoint companion
+ *      descriptor that is used to configure the endpoint
  *
  * the bus controller driver lists all the general purpose endpoints in
  * gadget->ep_list.  the control endpoint (gadget->ep0) is not in that list,
@@ -149,8 +155,10 @@ struct usb_ep {
         const struct usb_ep_ops *ops;
         struct list_head        ep_list;
         unsigned                maxpacket:16;
+        unsigned                max_streams:16;
         u8                      address;
         const struct usb_endpoint_descriptor    *desc;
+        const struct usb_ss_ep_comp_descriptor  *comp_desc;
 };
 
 /*-------------------------------------------------------------------------*/
@@ -895,6 +903,11 @@ static inline void usb_free_descriptors(struct usb_descriptor_header **v)
 extern struct usb_ep *usb_ep_autoconfig(struct usb_gadget *,
                         struct usb_endpoint_descriptor *);
 
+
+extern struct usb_ep *usb_ep_autoconfig_ss(struct usb_gadget *,
+                        struct usb_endpoint_descriptor *,
+                        struct usb_ss_ep_comp_descriptor *);
+
 extern void usb_ep_autoconfig_reset(struct usb_gadget *);
 
 #endif /* __LINUX_USB_GADGET_H */