On Thu, Jun 07, 2007 at 01:14:45PM +0200, Clemens Ladisch wrote:
> Try the attached patch.
It seems to work well, at least in my limited tests. I've been using it
together with this patch to make usbaudio.c understand low-speed devices:
diff -ur linux-2.6.22-rc4/sound/usb/usbaudio.c
linux-2.6.22-rc4.patched/sound/usb/usbaudio.c
--- linux-2.6.22-rc4/sound/usb/usbaudio.c 2007-06-05 02:57:25.000000000
+0200
+++ linux-2.6.22-rc4.patched/sound/usb/usbaudio.c 2007-06-07
13:56:08.000000000 +0200
@@ -1012,10 +1012,10 @@
unsigned int npacks[MAX_URBS], urb_packs, total_packs, packs_per_ms;
/* calculate the frequency in 16.16 format */
- if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
- subs->freqn = get_usb_full_speed_rate(rate);
- else
+ if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH)
subs->freqn = get_usb_high_speed_rate(rate);
+ else
+ subs->freqn = get_usb_full_speed_rate(rate);
subs->freqm = subs->freqn;
/* calculate max. frequency */
if (subs->maxpacksize) {
@@ -1379,7 +1379,7 @@
get_endpoint(alts, 1)->bRefresh >= 1 &&
get_endpoint(alts, 1)->bRefresh <= 9)
subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
- else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
+ else if (snd_usb_get_speed(subs->dev) != USB_SPEED_HIGH)
subs->syncinterval = 1;
else if (get_endpoint(alts, 1)->bInterval >= 1 &&
get_endpoint(alts, 1)->bInterval <= 16)
@@ -2207,10 +2207,10 @@
subs->stream = as;
subs->direction = stream;
subs->dev = as->chip->dev;
- if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
- subs->ops = audio_urb_ops[stream];
- else
+ if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH)
subs->ops = audio_urb_ops_high_speed[stream];
+ else
+ subs->ops = audio_urb_ops[stream];
snd_pcm_set_ops(as->pcm, stream,
stream == SNDRV_PCM_STREAM_PLAYBACK ?
&snd_usb_playback_ops : &snd_usb_capture_ops);
@@ -3381,7 +3381,8 @@
*rchip = NULL;
- if (snd_usb_get_speed(dev) != USB_SPEED_FULL &&
+ if (snd_usb_get_speed(dev) != USB_SPEED_LOW &&
+ snd_usb_get_speed(dev) != USB_SPEED_FULL &&
snd_usb_get_speed(dev) != USB_SPEED_HIGH) {
snd_printk(KERN_ERR "unknown device speed %d\n",
snd_usb_get_speed(dev));
return -ENXIO;
Is this reasonably sane, or is a more thorough fix (differentiating better
between low- and full-speed devices) needed for a final patch?
/* Steinar */
--
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