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| author | Alexandre Bailon <abailon@baylibre.com> | 2015-09-14 18:20:44 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@google.com> | 2015-09-14 22:09:32 -0700 |
| commit | e5acf736caac014de39f618f7725164b75176fea (patch) | |
| tree | 63659e8ad6714634946bd88a6209044798bd13a4 /drivers/staging/greybus/es2.c | |
| parent | 64c9cabcac57904b8a6d6ae9e8a90c258762c86b (diff) | |
greybus: es2: add some documentation about endpoints mapping
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>
Diffstat (limited to 'drivers/staging/greybus/es2.c')
| -rw-r--r-- | drivers/staging/greybus/es2.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/staging/greybus/es2.c b/drivers/staging/greybus/es2.c index ec06dc65f98d..834ccd4e23b8 100644 --- a/drivers/staging/greybus/es2.c +++ b/drivers/staging/greybus/es2.c @@ -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); |