Commit e5acf736 authored by Alexandre Bailon's avatar Alexandre Bailon Committed by Greg Kroah-Hartman
Browse files

greybus: es2: add some documentation about endpoints mapping 



Signed-off-by: default avatarAlexandre Bailon <abailon@baylibre.com>
Reviewed-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
parent 64c9cabc

drivers/staging/greybus/es2.c

+10 −0
Original line number Diff line number Diff line
@@ -108,6 +108,12 @@ struct es1_ap_dev { 
	int *cport_to_ep;

};



/**

 * cport_to_ep - information about cport to endpoints mapping

 * @cport_id: the id of cport to map to endpoints

 * @endpoint_in: the endpoint number to use for in transfer

 * @endpoint_out: he endpoint number to use for out transfer

 */

struct cport_to_ep {

	__le16 cport_id;

	__u8 endpoint_in;
@@ -123,6 +129,7 @@ static void cport_out_callback(struct urb *urb); 
static void usb_log_enable(struct es1_ap_dev *es1);

static void usb_log_disable(struct es1_ap_dev *es1);



/* Get the endpoints pair mapped to the cport */

static int cport_to_ep_pair(struct es1_ap_dev *es1, u16 cport_id)

{

	if (cport_id >= es1->hd->num_cports)
@@ -132,6 +139,7 @@ static int cport_to_ep_pair(struct es1_ap_dev *es1, u16 cport_id) 


#define ES1_TIMEOUT	500	/* 500 ms for the SVC to do something */



/* Test if the endpoints pair is already mapped to a cport */

static int ep_pair_in_use(struct es1_ap_dev *es1, int ep_pair)

{

	int i;
@@ -143,6 +151,7 @@ static int ep_pair_in_use(struct es1_ap_dev *es1, int ep_pair) 
	return 0;

}



/* Configure the endpoint mapping and send the request to APBridge */

static int map_cport_to_ep(struct es1_ap_dev *es1,

				u16 cport_id, int ep_pair)

{
@@ -180,6 +189,7 @@ static int map_cport_to_ep(struct es1_ap_dev *es1, 
	return retval;

}



/* Unmap a cport: use the muxed endpoints pair */

static int unmap_cport(struct es1_ap_dev *es1, u16 cport_id)

{

	return map_cport_to_ep(es1, cport_id, 0);