greybus: es2.c: create dedicated struct for cport_in and cport_out

Instead of keep cport buffers, urbs and endpoints in es1_ap_dev,
move them in two dedicated struct (es1_cport_in and es1_cport_out),
in order to ease the migration to es2 (increase the number of endpoint).
Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/es2.c

@@ -52,6 +52,24 @@ static DEFINE_KFIFO(apb1_log_fifo, char, APB1_LOG_SIZE);
 /* vendor request APB1 log */
 #define REQUEST_LOG		0x02
 
+/*
+ * @endpoint: bulk in endpoint for CPort data
+ * @urb: array of urbs for the CPort in messages
+ * @buffer: array of buffers for the @cport_in_urb urbs
+ */
+struct es1_cport_in {
+	__u8 endpoint;
+	struct urb *urb[NUM_CPORT_IN_URB];
+	u8 *buffer[NUM_CPORT_IN_URB];
+};
+
+/*
+ * @endpoint: bulk out endpoint for CPort data
+ */
+struct es1_cport_out {
+	__u8 endpoint;
+};
+
 /**
  * es1_ap_dev - ES1 USB Bridge to AP structure
  * @usb_dev: pointer to the USB device we are.
@@ -59,12 +77,11 @@ static DEFINE_KFIFO(apb1_log_fifo, char, APB1_LOG_SIZE);
  * @hd: pointer to our greybus_host_device structure
  * @control_endpoint: endpoint to send data to SVC
  * @svc_endpoint: endpoint for SVC data in
- * @cport_in_endpoint: bulk in endpoint for CPort data
- * @cport-out_endpoint: bulk out endpoint for CPort data
+
  * @svc_buffer: buffer for SVC messages coming in on @svc_endpoint
  * @svc_urb: urb for SVC messages coming in on @svc_endpoint
- * @cport_in_urb: array of urbs for the CPort in messages
- * @cport_in_buffer: array of buffers for the @cport_in_urb urbs
+ * @cport_in: endpoint, urbs and buffer for cport in messages
+ * @cport_out: endpoint for for cport out messages
  * @cport_out_urb: array of urbs for the CPort out messages
  * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
  *			not.
@@ -77,14 +94,12 @@ struct es1_ap_dev {
 
 	__u8 control_endpoint;
 	__u8 svc_endpoint;
-	__u8 cport_in_endpoint;
-	__u8 cport_out_endpoint;
 
 	u8 *svc_buffer;
 	struct urb *svc_urb;
 
-	struct urb *cport_in_urb[NUM_CPORT_IN_URB];
-	u8 *cport_in_buffer[NUM_CPORT_IN_URB];
+	struct es1_cport_in cport_in;
+	struct es1_cport_out cport_out;
 	struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
 	bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
 	spinlock_t cport_out_urb_lock;
@@ -212,7 +227,7 @@ static void *message_send(struct greybus_host_device *hd, u16 cport_id,
 	put_unaligned_le16(cport_id, message->header->pad);
 
 	usb_fill_bulk_urb(urb, udev,
-			  usb_sndbulkpipe(udev, es1->cport_out_endpoint),
+			  usb_sndbulkpipe(udev, es1->cport_out.endpoint),
 			  buffer, buffer_size,
 			  cport_out_callback, message);
 	retval = usb_submit_urb(urb, gfp_mask);
@@ -302,14 +317,14 @@ static void ap_disconnect(struct usb_interface *interface)
 	}
 
 	for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
-		struct urb *urb = es1->cport_in_urb[i];
+		struct urb *urb = es1->cport_in.urb[i];
 
 		if (!urb)
 			break;
 		usb_kill_urb(urb);
 		usb_free_urb(urb);
-		kfree(es1->cport_in_buffer[i]);
-		es1->cport_in_buffer[i] = NULL;
+		kfree(es1->cport_in.buffer[i]);
+		es1->cport_in.buffer[i] = NULL;
 	}
 
 	usb_kill_urb(es1->svc_urb);
@@ -585,10 +600,10 @@ static int ap_probe(struct usb_interface *interface,
 			svc_interval = endpoint->bInterval;
 			int_in_found = true;
 		} else if (usb_endpoint_is_bulk_in(endpoint)) {
-			es1->cport_in_endpoint = endpoint->bEndpointAddress;
+			es1->cport_in.endpoint = endpoint->bEndpointAddress;
 			bulk_in_found = true;
 		} else if (usb_endpoint_is_bulk_out(endpoint)) {
-			es1->cport_out_endpoint = endpoint->bEndpointAddress;
+			es1->cport_out.endpoint = endpoint->bEndpointAddress;
 			bulk_out_found = true;
 		} else {
 			dev_err(&udev->dev,
@@ -630,11 +645,11 @@ static int ap_probe(struct usb_interface *interface,
 			goto error;
 
 		usb_fill_bulk_urb(urb, udev,
-				  usb_rcvbulkpipe(udev, es1->cport_in_endpoint),
+				  usb_rcvbulkpipe(udev, es1->cport_in.endpoint),
 				  buffer, ES1_GBUF_MSG_SIZE_MAX,
 				  cport_in_callback, hd);
-		es1->cport_in_urb[i] = urb;
-		es1->cport_in_buffer[i] = buffer;
+		es1->cport_in.urb[i] = urb;
+		es1->cport_in.buffer[i] = buffer;
 		retval = usb_submit_urb(urb, GFP_KERNEL);
 		if (retval)
 			goto error;