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sound: usb-audio: remove check_hw_params_convention() 

This removes the check_hw_params_convention() function because
1) it is not necessary, as the hw_rule_* functions also work correctly
   (i.e., as no-ops) when the device supports all combinations of the
   audio format parameters; and
2) it would become too complex when adding a fourth altsetting-dependent
   hardware parameter, as this would require another three loops to
   check dependecies with rate/channels/format.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2009-04-03 09:42:42 +02:00 committed by Takashi Iwai
parent 488fe1665f
commit 4608eb089b
1 changed files with 19 additions and 116 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

135
sound/usb/usbaudio.c
View File

@ -1736,97 +1736,6 @@ static int hw_rule_format(struct snd_pcm_hw_params *params,
return changed;
}
#define MAX_MASK 64
/*
* check whether the registered audio formats need special hw-constraints
*/
static int check_hw_params_convention(struct snd_usb_substream *subs)
{
int i;
u32 *channels;
u32 *rates;
u32 cmaster, rmaster;
u32 rate_min = 0, rate_max = 0;
struct list_head *p;
int err = 1;
channels = kcalloc(MAX_MASK, sizeof(u32), GFP_KERNEL);
rates = kcalloc(MAX_MASK, sizeof(u32), GFP_KERNEL);
if (!channels || !rates) {
err = -ENOMEM;
goto __out;
}
list_for_each(p, &subs->fmt_list) {
struct audioformat *f;
f = list_entry(p, struct audioformat, list);
/* unconventional channels? */
if (f->channels > 32)
goto __out;
/* continuous rate min/max matches? */
if (f->rates & SNDRV_PCM_RATE_CONTINUOUS) {
if (rate_min && f->rate_min != rate_min)
goto __out;
if (rate_max && f->rate_max != rate_max)
goto __out;
rate_min = f->rate_min;
rate_max = f->rate_max;
}
/* combination of continuous rates and fixed rates? */
if (rates[f->format] & SNDRV_PCM_RATE_CONTINUOUS) {
if (f->rates != rates[f->format])
goto __out;
}
if (f->rates & SNDRV_PCM_RATE_CONTINUOUS) {
if (rates[f->format] && rates[f->format] != f->rates)
goto __out;
}
channels[f->format] |= 1 << (f->channels - 1);
rates[f->format] |= f->rates;
/* needs knot? */
if (f->rates & SNDRV_PCM_RATE_KNOT)
goto __out;
}
/* check whether channels and rates match for all formats */
cmaster = rmaster = 0;
for (i = 0; i < MAX_MASK; i++) {
if (cmaster != channels[i] && cmaster && channels[i])
goto __out;
if (rmaster != rates[i] && rmaster && rates[i])
goto __out;
if (channels[i])
cmaster = channels[i];
if (rates[i])
rmaster = rates[i];
}
/* check whether channels match for all distinct rates */
memset(channels, 0, MAX_MASK * sizeof(u32));
list_for_each(p, &subs->fmt_list) {
struct audioformat *f;
f = list_entry(p, struct audioformat, list);
if (f->rates & SNDRV_PCM_RATE_CONTINUOUS)
continue;
for (i = 0; i < 32; i++) {
if (f->rates & (1 << i))
channels[i] |= 1 << (f->channels - 1);
}
}
cmaster = 0;
for (i = 0; i < 32; i++) {
if (cmaster != channels[i] && cmaster && channels[i])
goto __out;
if (channels[i])
cmaster = channels[i];
}
err = 0;
__out:
kfree(channels);
kfree(rates);
return err;
}
/*
* If the device supports unusual bit rates, does the request meet these?
*/
@ -1909,32 +1818,26 @@ static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substre
1000,
/*(nrpacks * MAX_URBS) * 1000*/ UINT_MAX);
err = check_hw_params_convention(subs);
if (err < 0)
if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
hw_rule_rate, subs,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_CHANNELS,
-1)) < 0)
return err;
if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
hw_rule_channels, subs,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_RATE,
-1)) < 0)
return err;
if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
hw_rule_format, subs,
SNDRV_PCM_HW_PARAM_RATE,
SNDRV_PCM_HW_PARAM_CHANNELS,
-1)) < 0)
return err;
if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
return err;
else if (err) {
hwc_debug("setting extra hw constraints...\n");
if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
hw_rule_rate, subs,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_CHANNELS,
-1)) < 0)
return err;
if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
hw_rule_channels, subs,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_RATE,
-1)) < 0)
return err;
if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
hw_rule_format, subs,
SNDRV_PCM_HW_PARAM_RATE,
SNDRV_PCM_HW_PARAM_CHANNELS,
-1)) < 0)
return err;
if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
return err;
}
return 0;
}