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authorDaniel Mack <zonque@gmail.com>2012-04-24 21:31:24 +0400
committerTakashi Iwai <tiwai@suse.de>2012-04-24 22:16:18 +0400
commit07a5e9d4fd0218e9243875c87f85287a2a3b38c0 (patch)
tree9e929a0663e0d72801b22f3f9c2a24c42016b97a /sound/usb
parente9f66d9b9ce03f74a52894cebedf12b67f65dd24 (diff)
downloadlinux-07a5e9d4fd0218e9243875c87f85287a2a3b38c0.tar.xz
ALSA: snd-usb: fix some typos in endpoint.c documentation
Also be more specific about some details while at it. Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/endpoint.c58
1 files changed, 33 insertions, 25 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 83a36d0d2a2d..e6906901debb 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -40,25 +40,26 @@
* USB endpoint and its streaming.
*
* There are functions to activate and deactivate the streaming URBs and
- * optinal callbacks to let the pcm logic handle the actual content of the
+ * optional callbacks to let the pcm logic handle the actual content of the
* packets for playback and record. Thus, the bus streaming and the audio
* handlers are fully decoupled.
*
- * There are two different types of endpoints in for audio applications.
+ * There are two different types of endpoints in audio applications.
*
* SND_USB_ENDPOINT_TYPE_DATA handles full audio data payload for both
* inbound and outbound traffic.
*
- * SND_USB_ENDPOINT_TYPE_SYNC are for inbound traffic only and expect the
- * payload to carry Q16.16 formatted sync information (3 or 4 bytes).
+ * SND_USB_ENDPOINT_TYPE_SYNC endpoints are for inbound traffic only and
+ * expect the payload to carry Q10.14 / Q16.16 formatted sync information
+ * (3 or 4 bytes).
*
- * Each endpoint has to be configured (by calling
- * snd_usb_endpoint_set_params()) before it can be used.
+ * Each endpoint has to be configured prior to being used by calling
+ * snd_usb_endpoint_set_params().
*
* The model incorporates a reference counting, so that multiple users
* can call snd_usb_endpoint_start() and snd_usb_endpoint_stop(), and
* only the first user will effectively start the URBs, and only the last
- * one will tear them down again.
+ * one to stop it will tear the URBs down again.
*/
/*
@@ -120,7 +121,7 @@ static const char *usb_error_string(int err)
/**
* snd_usb_endpoint_implicit_feedback_sink: Report endpoint usage type
*
- * @ep: The endpoint
+ * @ep: The snd_usb_endpoint
*
* Determine whether an endpoint is driven by an implicit feedback
* data endpoint source.
@@ -278,17 +279,18 @@ static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep,
}
/*
- * Send output urbs that have been prepared previously. Urbs are dequeued
+ * Send output urbs that have been prepared previously. URBs are dequeued
* from ep->ready_playback_urbs and in case there there aren't any available
* or there are no packets that have been prepared, this function does
* nothing.
*
- * The reason why the functionality of sending and preparing urbs is separated
- * is that host controllers don't guarantee an ordering in returing inbound
- * and outbound packets to their submitters.
+ * The reason why the functionality of sending and preparing URBs is separated
+ * is that host controllers don't guarantee the order in which they return
+ * inbound and outbound packets to their submitters.
*
* This function is only used for implicit feedback endpoints. For endpoints
- * driven by sync endpoints, urbs are submitted from their completion handler.
+ * driven by dedicated sync endpoints, URBs are immediately re-submitted
+ * from their completion handler.
*/
static void queue_pending_output_urbs(struct snd_usb_endpoint *ep)
{
@@ -391,7 +393,7 @@ exit_clear:
}
/**
- * snd_usb_add_endpoint: Add an endpoint to an audio chip
+ * snd_usb_add_endpoint: Add an endpoint to an USB audio chip
*
* @chip: The chip
* @alts: The USB host interface
@@ -745,11 +747,14 @@ out_of_memory:
}
/**
- * snd_usb_endpoint_set_params: configure an snd_endpoint
+ * snd_usb_endpoint_set_params: configure an snd_usb_endpoint
*
- * @ep: the endpoint to configure
+ * @ep: the snd_usb_endpoint to configure
+ * @hw_params: the hardware parameters
+ * @fmt: the USB audio format information
+ * @sync_ep: the sync endpoint to use, if any
*
- * Determine the number of of URBs to be used on this endpoint.
+ * Determine the number of URBs to be used on this endpoint.
* An endpoint must be configured before it can be started.
* An endpoint that is already running can not be reconfigured.
*/
@@ -807,7 +812,7 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
* @ep: the endpoint to start
*
* A call to this function will increment the use count of the endpoint.
- * In case this not already running, the URBs for this endpoint will be
+ * In case it is not already running, the URBs for this endpoint will be
* submitted. Otherwise, this function does nothing.
*
* Must be balanced to calls of snd_usb_endpoint_stop().
@@ -840,7 +845,8 @@ int snd_usb_endpoint_start(struct snd_usb_endpoint *ep)
/*
* If this endpoint has a data endpoint as implicit feedback source,
* don't start the urbs here. Instead, mark them all as available,
- * wait for the record urbs to arrive and queue from that context.
+ * wait for the record urbs to return and queue the playback urbs
+ * from that context.
*/
set_bit(EP_FLAG_RUNNING, &ep->flags);
@@ -892,7 +898,7 @@ __error:
*
* A call to this function will decrement the use count of the endpoint.
* In case the last user has requested the endpoint stop, the URBs will
- * actually deactivated.
+ * actually be deactivated.
*
* Must be balanced to calls of snd_usb_endpoint_start().
*/
@@ -994,7 +1000,8 @@ int snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep)
return -EBUSY;
}
-/** snd_usb_endpoint_free: Free the resources of an snd_usb_endpoint
+/**
+ * snd_usb_endpoint_free: Free the resources of an snd_usb_endpoint
*
* @ep: the list header of the endpoint to free
*
@@ -1032,8 +1039,9 @@ void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
/*
* In case the endpoint is operating in implicit feedback mode, prepare
- * and a new outbound URB that has the same layout as the received
- * packet and add it to the list of pending urbs.
+ * a new outbound URB that has the same layout as the received packet
+ * and add it to the list of pending urbs. queue_pending_output_urbs()
+ * will take care of them later.
*/
if (snd_usb_endpoint_implict_feedback_sink(ep) &&
ep->use_count != 0) {
@@ -1063,8 +1071,8 @@ void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
/*
* Iterate through the inbound packet and prepare the lengths
* for the output packet. The OUT packet we are about to send
- * will have the same amount of payload than the IN packet we
- * just received.
+ * will have the same amount of payload bytes than the IN
+ * packet we just received.
*/
out_packet->packets = in_ctx->packets;