Problems with a PCM driver

[Adrian McMenamin <adrian@mcmen.demon.co.uk>]

I am writing a PCM driver for the AICA device on the Sega Dreamcast for a 
2.6.0-testX kernel.

The driver is far from complete, but I am having various problems when I test 
bits of it...

A simple write of a file gives me this...

/dev/snd # cat /test.txt > pcmC0D0p
ALSA sound/sh/aica.c:165: In snd_aica_playback_open
ALSA sound/sh/aica.c:80: Disabling AICA device
ALSA sound/sh/aica.c:66: Enabling AICA device
cat: write: File descriptor in bad state

The three snd_printk messages are just what I would expect but I am not sure 
why I get the message about the file descriptor.

Here is the open function...

static int snd_aica_playback_open(snd_pcm_substream_t *subs)
{
	snd_printk("In snd_aica_playback_open \n");
	snd_aica_pcm_t *aica_chip = snd_pcm_substream_chip(subs);
	snd_pcm_runtime_t *runtime = subs->runtime;
	runtime->hw = snd_aica_playback_hw;


	/*setup the aica spu*/
	
	spu_disable();
	spu_memset(0, 0, 0x31000);
	spu_memload(0, bin_arm7, sizeof(bin_arm7));
	spu_enable();

	
	return 0;
}


The device doesn't support dma (or rather nobody has yet successful reversed 
the DMA mechanism) and so I am using the methods that worked when I wrote the 
OSS driver for the 2.4 kernels.

snd_aica_playback_hw is...

static snd_pcm_hardware_t snd_aica_playback_hw = {
	.info = SNDRV_PCM_INFO_INTERLEAVED|SNDRV_PCM_INFO_NONINTERLEAVED,
	.formats = SNDRV_PCM_FORMAT_S8 | SNDRV_PCM_FORMAT_U8 | 
SNDRV_PCM_FORMAT_S16_LE | SNDRV_PCM_FORMAT_IMA_ADPCM,
	.rates = SNDRV_PCM_RATE_8000_44100,
	.rate_min = 8000,
	.rate_max = 44100,
	.channels_min = 1,
	.channels_max = 2,
	.buffer_bytes_max = 32768,
	.period_bytes_min = 8192,
	.period_bytes_max = 32768,
	.periods_min = 1,
	.periods_max = 4
};

Anybody able to give me a few pointers as to what is going wrong?

Thanks

Adrian


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