Some controllers support scatter/gather transfers
and that might be very useful for some gadget drivers.
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
---
include/linux/usb/gadget.h | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 317d892..3171a38 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -20,6 +20,7 @@
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
+#include <linux/scatterlist.h>
#include <linux/types.h>
#include <linux/usb/ch9.h>
@@ -32,6 +33,8 @@ struct usb_ep;
* @dma: DMA address corresponding to 'buf'. If you don't set this
* field, and the usb controller needs one, it is responsible
* for mapping and unmapping the buffer.
+ * @sg: a scatterlist for SG-capable controllers.
+ * @num_sgs: number of SG entries
* @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.
@@ -88,6 +91,9 @@ struct usb_request {
unsigned length;
dma_addr_t dma;
+ struct scatterlist *sg;
+ unsigned num_sgs;
+
unsigned stream_id:16;
unsigned no_interrupt:1;
unsigned zero:1;
@@ -479,6 +485,7 @@ struct usb_gadget_ops {
* @speed: Speed of current connection to USB host.
* @max_speed: Maximal speed the UDC can handle. UDC must support this
* and all slower speeds.
+ * @sg_tablesize: largest number of sg list entries or 0.
* @is_otg: True if the USB device port uses a Mini-AB jack, so that the
* gadget driver must provide a USB OTG descriptor.
* @is_a_peripheral: False unless is_otg, the "A" end of a USB cable
@@ -519,6 +526,7 @@ struct usb_gadget {
struct list_head ep_list; /* of usb_ep */
enum usb_device_speed speed;
enum usb_device_speed max_speed;
+ unsigned sg_tablesize;
unsigned is_otg:1;
unsigned is_a_peripheral:1;
unsigned b_hnp_enable:1;
--
1.7.8.rc3
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