Support for platform bus

Support for platform bus

[Adrian McMenamin]

I am attempting to write an ALSA driver for the sound card on the
Dreamcast.

I have this in the code:

	snd_card_set_dev(dreamcastcard, &platform_bus);

No errors are reported but the card doesn't show up in sysfs as a device
registered to the platform bus - is this because I need to do more to
force the device to appear there? (it doesn't appear under any bus but
it does show up as a module in sysfs):

sh-3.00# cd module
sh-3.00# ls -l
drwxr-xr-x    3 root     root            0 Aug 31 18:23 lockd
drwxr-xr-x    3 root     root            0 Aug 31 18:23 psmouse
drwxr-xr-x    3 root     root            0 Aug 31 18:26 snd
drwxr-xr-x    2 root     root            0 Aug 31 18:26 snd_card_aica
drwxr-xr-x    2 root     root            0 Aug 31 18:26 soundcore
sh-3.00# ls -l snd_card_aica/
-r--r--r--    1 root     root         4096 Aug 31 18:29 refcnt


Please cc me into any replies as I am not (yet - mailman seems slow)
subscribed to the list.

Thanks

Adrian



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Re: Support for platform bus

[Lee Revell]

On Thu, 2005-09-01 at 00:42 +0100, Adrian McMenamin wrote:
> I am attempting to write an ALSA driver for the sound card on the
> Dreamcast.

Please post your driver source code.

Lee



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Re: Support for platform bus

[Adrian McMenamin]

On Thu, 2005-09-01 at 00:12 -0400, Lee Revell wrote:
> On Thu, 2005-09-01 at 00:42 +0100, Adrian McMenamin wrote:
> > I am attempting to write an ALSA driver for the sound card on the
> > Dreamcast.
> 
> Please post your driver source code.
> 
> Lee

Anybody who wants to see all of it can look at
http://newgolddream.dyndns.info/repos but here's the relevant bit
(obviously this is a work in progress so be gentle with me):

static int __init aica_pcm_init(void)
{

	
	int err;
	int idx;
	struct snd_aicapcmchip *chip;
	snd_printk("Probing for AICA device\n");

	
	/* Are we in a Dreamcast at all? */
	if (!mach_is_dreamcast()) return -ENODEV;
	dreamcastcard = NULL;
	/* Can only be one real device on a Dreamcast
	   but we might have the dummy or some other driver loaded */
	for (idx = 0; idx < SNDRV_CARDS; idx++)
	{	
		dreamcastcard = snd_card_new(idx, "AICA", THIS_MODULE, 0);
		if (dreamcastcard) break;
	}
	if (!dreamcastcard) return -ENODEV;
	strcpy(dreamcastcard->shortname, "AICA ");
	strcpy(dreamcastcard->longname, "Dreamcast AICA PCM Sound device ");

	/* Load the PCM 'chip' */
	if ((err = snd_aicapcmchip(dreamcastcard, &chip)) < 0) {
		snd_card_free(dreamcastcard);
		snd_printk("Could not initialise AICA PCM device\n");
		return err;
	}

	/* Set up the ALSA PCM subsystem */


	/* register with sysfs etc - this is not on a 'proper' bus so just use
the generic */
	snd_card_set_dev(dreamcastcard, &platform_bus);

	/* Register the card with ALSA subsystem */
	if ((err = snd_card_register(dreamcastcard)) < 0) {
		snd_card_free(dreamcastcard);
		return err;
	}
	snd_printk("Dreamcast AICA device registered on slot %d\n", idx);



	return 0; 



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Re: Support for platform bus

[Takashi Iwai]

At Thu, 01 Sep 2005 00:42:36 +0100,
Adrian McMenamin wrote:
> 
> I am attempting to write an ALSA driver for the sound card on the
> Dreamcast.
> 
> I have this in the code:
> 
> 	snd_card_set_dev(dreamcastcard, &platform_bus);

The second argument is the pointer to struct device.
You should have got a compiler warning about pointer cast.


Takashi


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