linux-kernel - Re: [alsa-devel] [PATCH] ASoC: atmel_ssc_dai: Track playback and capture CMR dividers separately.

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Message-ID: <544707F3.1020505@atmel.com>
Date:	Wed, 22 Oct 2014 09:27:15 +0800
From:	Bo Shen <voice.shen@...el.com>
To:	Peter Rosin <peda@...ntia.se>
CC:	"'alsa-devel@...a-project.org'" <alsa-devel@...a-project.org>,
	"Takashi Iwai" <tiwai@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	"Mark Brown" <broonie@...nel.org>
Subject: Re: [alsa-devel] [PATCH] ASoC: atmel_ssc_dai: Track playback and
 capture CMR dividers separately.

Hi Peter,

On 10/21/2014 09:05 PM, Peter Rosin wrote:
> I did some further tests, and the following program fails without the patch:

With the patch, it is OK?

> #include <sys/ioctl.h>
> #include <unistd.h>
> #include <fcntl.h>
> #include <sys/soundcard.h>
>
> int
> main(void)
> {
> 	int fd;
> 	int format;
> 	int channels;
>
> 	if ((fd = open("/dev/dsp", O_WRONLY, 0)) == -1) {
> 		perror("open");
> 		return 1;
> 	}
> 	format = AFMT_S16_LE;
> 	if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) == -1) {
> 		perror("SNDCTL_DSP_SETFMT");
> 		return 1;
> 	}
> 	channels = 2;
> 	if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) == -1) {
> 		perror("SNDCTL_DSP_CHANNELS");
> 		return 1;
> 	}
> 	return 0;
> }
>
> Output:
> SNDCTL_DSP_CHANNELS: Device or resource busy

This return from codec or from atmel_ssc_dai?

> (I admin to having edited the above code slightly in this mail, so I might have
> introduced some silly bug, but you get what I mean, just open the device
> and request some parameters, and boom: -EBUSY)
>
> Cheers,
> Peter
>

Best Regards,
Bo Shen
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