[PATCH v2 03/12] usb: gadget: Expose sublink speed attributes

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The USB 3.2 specification supports dual-lane and different transfer
rates for super-speed-plus. Devices operating in super-speed-plus can
be gen2x1, gen1x2, or gen2x2.

A gadget driver may need to know the gadget's sublink speeds to properly
setup its transfer requests and describe its capability in its
descriptors. To describe the transfer rate in super-speed-plus fully,
let's expose the lane count and sublink speed attributes when operating
in super-speed-plus.

Signed-off-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
---
 Changes in v2:
 - None

 include/linux/usb/gadget.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 6a178177e4c9..2ab929eed928 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -338,6 +338,15 @@ 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.
+ * @num_lanes: Number of lanes in use.
+ * @max_num_lanes: Maximum number of lanes the UDC supports.
+ * @ssac: Sublink speed attribute count. The number of sublink speed
+ *	attributes is ssac + 1.
+ * @sublink_speed: Array of sublink speed attributes the UDC supports. Sublink
+ *	speed attributes are paired, and an RX followed by a TX attribute.
+ * @speed_ssid: Current sublink speed attribute ID in use.
+ * @min_speed_ssid: Sublink speed attribute ID with the minimum speed.
+ * @max_speed_ssid: Sublink speed attribute ID with the maximum speed.
  * @state: the state we are now (attached, suspended, configured, etc)
  * @name: Identifies the controller hardware type.  Used in diagnostics
  *	and sometimes configuration.
@@ -405,6 +414,17 @@ struct usb_gadget {
 	struct list_head		ep_list;	/* of usb_ep */
 	enum usb_device_speed		speed;
 	enum usb_device_speed		max_speed;
+
+	/* SSP only */
+	unsigned			num_lanes;
+	unsigned			max_num_lanes;
+	unsigned			ssac;
+#define USB_GADGET_MAX_SSAC 3
+	struct usb_sublink_speed	sublink_speed[USB_GADGET_MAX_SSAC + 1];
+	unsigned			speed_ssid;
+	unsigned			min_speed_ssid;
+	unsigned			max_speed_ssid;
+
 	enum usb_device_state		state;
 	const char			*name;
 	struct device			dev;
-- 
2.11.0





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