Hans-Christian Egtvedt wrote:
> Hello
>
> I'm strugling a bit with getting my AC97 driver to be full duplex. The
> hardware supports it, but I can't seem to enable it correctly in the driver.
>
> Is there anything I've missed other than this?
> err = snd_pcm_new(chip->card, "Atmel AC97", 0, 1, 1, &pcm);
This is actually correct I see, I have both a substream for capture and
a substream for playback:
~ # aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: AC97 [Atmel AVR32 AC97], device 0: Atmel AC97 [Atmel AC97]
Subdevices: 1/1
Subdevice #0: subdevice #0
~ # arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: AC97 [Atmel AVR32 AC97], device 0: Atmel AC97 [Atmel AC97]
Subdevices: 1/1
Subdevice #0: subdevice #0
I assume this is a "good" output from the utils.
> AFAIK this should give me two substreams, one for capture and one for
> playback. Do I have to take some care with other calls?
>
> When I try to playback and record simultaneously I get the following error:
> ALSA lib pcm_params.c:2152:(snd_pcm_hw_refine_slave) Slave PCM not usable
> aplay: set_params:879: Broken configuration for this PCM: no
> configurations available
This problem is due to the following open call, and was solved by
commenting it out, which is not an option for the final driver.
Open call:
static int
snd_atmel_ac97_playback_open(snd_pcm_substream_t *substream)
{
atmel_ac97_t *chip = snd_pcm_substream_chip(substream);
snd_pcm_runtime_t *runtime = substream->runtime;
chip->playback_active = 1;
printk(KERN_INFO "atmel-ac97: entering playback open\n");
runtime->hw = snd_atmel_ac97_playback_hw;
/* Setup hardware to match capture settings */
#if 0
if (chip->capture_active) {
int err = 0;
snd_pcm_runtime_t *capture_runtime =
chip->capture_substream->runtime;
hw_rates[0] = (unsigned int)capture_runtime->rate;
hw_constraint_rates.count = ARRAY_SIZE(hw_rates);
hw_constraint_rates.list = hw_rates;
hw_constraint_rates.mask = 0;
hw_formats[0] = (unsigned int)capture_runtime->format;
hw_constraint_formats.count = ARRAY_SIZE(hw_formats);
hw_constraint_formats.list = hw_formats;
hw_constraint_formats.mask = 0;
printk(KERN_INFO "atmel_ac97: capture active, set limits to playback\n");
err = snd_pcm_hw_constraint_list(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
&hw_constraint_rates);
err = snd_pcm_hw_constraint_list(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_FORMAT,
&hw_constraint_formats);
printk(KERN_INFO "atmel-ac97: limiting playback rate to %d\n",
capture_runtime->rate);
if (err < 0)
return err;
}
#endif
chip->playback_substream = substream;
chip->period = 0;
return 0;
}
Seems like this open call (without #if 0) clear the configuration for
the PCM, basicly leaving it unusable.
Any comments?
--
With kind regards,
Med vennlig hilsen,
Hans-Christian Egtvedt
Applications Engineer - AVR Applications Lab
Atmel Norway
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