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ALSA: usb-audio: rename alt_idx to altsetting

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As Clemens Ladisch kindly explained:
 "Please note that there are two methods to identify alternate settings:
  the number, which is the value in bAlternateSetting, and the index,
  which is the index in the descriptor array.  There might be some wording
  in the USB spec that these two values must be the same, but in reality,
  [insert standard rant about firmware writers], bAlternateSetting
  must be treated as a random ID value."

This patch changes the name to express the correct usage semantics.
No functional change.

Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Eldad Zack 2013-10-06 22:31:13 +02:00 committed by Takashi Iwai
parent 06613f547a
commit df23a2466a
3 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sound/usb/card.h
View File

@ -96,7 +96,7 @@ struct snd_usb_endpoint {
unsigned int syncinterval; /* P for adaptive mode, 0 otherwise */
unsigned char silence_value;
unsigned int stride;
int iface, alt_idx;
int iface, altsetting;
int skip_packets; /* quirks for devices to ignore the first n packets
in a stream */

6
sound/usb/endpoint.c
View File

@ -426,9 +426,9 @@ struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
list_for_each_entry(ep, &chip->ep_list, list) {
if (ep->ep_num == ep_num &&
ep->iface == alts->desc.bInterfaceNumber &&
ep->alt_idx == alts->desc.bAlternateSetting) {
ep->altsetting == alts->desc.bAlternateSetting) {
snd_printdd(KERN_DEBUG "Re-using EP %x in iface %d,%d @%p\n",
ep_num, ep->iface, ep->alt_idx, ep);
ep_num, ep->iface, ep->altsetting, ep);
goto __exit_unlock;
}
}
@ -447,7 +447,7 @@ struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
ep->type = type;
ep->ep_num = ep_num;
ep->iface = alts->desc.bInterfaceNumber;
ep->alt_idx = alts->desc.bAlternateSetting;
ep->altsetting = alts->desc.bAlternateSetting;
INIT_LIST_HEAD(&ep->ready_playback_urbs);
ep_num &= USB_ENDPOINT_NUMBER_MASK;

6
sound/usb/pcm.c
View File

@ -241,17 +241,17 @@ static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
struct snd_usb_endpoint *ep = subs->sync_endpoint;
if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
err = usb_set_interface(subs->dev,
subs->sync_endpoint->iface,
subs->sync_endpoint->alt_idx);
subs->sync_endpoint->altsetting);
if (err < 0) {
clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
snd_printk(KERN_ERR
"%d:%d:%d: cannot set interface (%d)\n",
subs->dev->devnum,
subs->sync_endpoint->iface,
subs->sync_endpoint->alt_idx, err);
subs->sync_endpoint->altsetting, err);
return -EIO;
}
}