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greybus: es2: add some documentation about endpoints mapping

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Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Alexandre Bailon 2015-09-14 18:20:44 +02:00 committed by Greg Kroah-Hartman
parent 64c9cabcac
commit e5acf736ca
1 changed files with 10 additions and 0 deletions
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10
drivers/staging/greybus/es2.c
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@ -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);