usbusx2yaudio.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,028 行 · 第 1/2 页

 * that.
 */
static struct s_c2
{
	char c1, c2;
}
	SetRate44100[] =
{
	{ 0x14, 0x08},	// this line sets 44100, well actually a little less
	{ 0x18, 0x40},	// only tascam / frontier design knows the further lines .......
	{ 0x18, 0x42},
	{ 0x18, 0x45},
	{ 0x18, 0x46},
	{ 0x18, 0x48},
	{ 0x18, 0x4A},
	{ 0x18, 0x4C},
	{ 0x18, 0x4E},
	{ 0x18, 0x50},
	{ 0x18, 0x52},
	{ 0x18, 0x54},
	{ 0x18, 0x56},
	{ 0x18, 0x58},
	{ 0x18, 0x5A},
	{ 0x18, 0x5C},
	{ 0x18, 0x5E},
	{ 0x18, 0x60},
	{ 0x18, 0x62},
	{ 0x18, 0x64},
	{ 0x18, 0x66},
	{ 0x18, 0x68},
	{ 0x18, 0x6A},
	{ 0x18, 0x6C},
	{ 0x18, 0x6E},
	{ 0x18, 0x70},
	{ 0x18, 0x72},
	{ 0x18, 0x74},
	{ 0x18, 0x76},
	{ 0x18, 0x78},
	{ 0x18, 0x7A},
	{ 0x18, 0x7C},
	{ 0x18, 0x7E}
};
static struct s_c2 SetRate48000[] =
{
	{ 0x14, 0x09},	// this line sets 48000, well actually a little less
	{ 0x18, 0x40},	// only tascam / frontier design knows the further lines .......
	{ 0x18, 0x42},
	{ 0x18, 0x45},
	{ 0x18, 0x46},
	{ 0x18, 0x48},
	{ 0x18, 0x4A},
	{ 0x18, 0x4C},
	{ 0x18, 0x4E},
	{ 0x18, 0x50},
	{ 0x18, 0x52},
	{ 0x18, 0x54},
	{ 0x18, 0x56},
	{ 0x18, 0x58},
	{ 0x18, 0x5A},
	{ 0x18, 0x5C},
	{ 0x18, 0x5E},
	{ 0x18, 0x60},
	{ 0x18, 0x62},
	{ 0x18, 0x64},
	{ 0x18, 0x66},
	{ 0x18, 0x68},
	{ 0x18, 0x6A},
	{ 0x18, 0x6C},
	{ 0x18, 0x6E},
	{ 0x18, 0x70},
	{ 0x18, 0x73},
	{ 0x18, 0x74},
	{ 0x18, 0x76},
	{ 0x18, 0x78},
	{ 0x18, 0x7A},
	{ 0x18, 0x7C},
	{ 0x18, 0x7E}
};
#define NOOF_SETRATE_URBS ARRAY_SIZE(SetRate48000)

static int usX2Y_rate_set(usX2Ydev_t *usX2Y, int rate)
{
	int			err = 0, i;
	snd_usX2Y_urbSeq_t	*us = NULL;
	int			*usbdata = NULL;
	DECLARE_WAITQUEUE(wait, current);
	struct s_c2		*ra = rate == 48000 ? SetRate48000 : SetRate44100;

	if (usX2Y->rate != rate) {
		do {
			us = kmalloc(sizeof(*us) + sizeof(struct urb*) * NOOF_SETRATE_URBS, GFP_KERNEL);
			if (NULL == us) {
				err = -ENOMEM;
				break;
			}
			memset(us, 0, sizeof(*us) + sizeof(struct urb*) * NOOF_SETRATE_URBS); 
			usbdata = kmalloc(sizeof(int)*NOOF_SETRATE_URBS, GFP_KERNEL);
			if (NULL == usbdata) {
				err = -ENOMEM;
				break;
			}
			for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
				if (NULL == (us->urb[i] = usb_alloc_urb(0, GFP_KERNEL))) {
					err = -ENOMEM;
					break;
				}
				((char*)(usbdata + i))[0] = ra[i].c1;
				((char*)(usbdata + i))[1] = ra[i].c2;
				usb_fill_bulk_urb(us->urb[i], usX2Y->chip.dev, usb_sndbulkpipe(usX2Y->chip.dev, 4),
						  usbdata + i, 2, i_usX2Y_04Int, usX2Y);
#ifdef OLD_USB
				us->urb[i]->transfer_flags = USB_QUEUE_BULK;
#endif
			}
			if (err)
				break;

			add_wait_queue(&usX2Y->In04WaitQueue, &wait);
			set_current_state(TASK_INTERRUPTIBLE);
			us->submitted =	0;
			us->len =	NOOF_SETRATE_URBS;
			usX2Y->US04 =	us;
		
			do {
				signed long	timeout = schedule_timeout(HZ/2);
                	
				if (signal_pending(current)) {
					err = -ERESTARTSYS;
					break;
				}
				if (0 == timeout) {
					err = -ENODEV;
					break;
				}
				usX2Y->rate = rate;
				usX2Y->refframes = rate == 48000 ? 47 : 44;
			} while (0);
		
			remove_wait_queue(&usX2Y->In04WaitQueue, &wait);
		} while (0);

		if (us) {
			us->submitted =	2*NOOF_SETRATE_URBS;
			for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
				usb_unlink_urb(us->urb[i]);
				usb_free_urb(us->urb[i]);
			}
			usX2Y->US04 = NULL;
			kfree(usbdata);
			kfree(us);
		}
	}

	return err;
}


static int usX2Y_format_set(usX2Ydev_t *usX2Y, snd_pcm_format_t format)
{
	int alternate, unlink_err, err;
	struct list_head* p;
	if (format == SNDRV_PCM_FORMAT_S24_3LE) {
		alternate = 2;
		usX2Y->stride = 6;
	} else {
		alternate = 1;
		usX2Y->stride = 4;
	}
	list_for_each(p, &usX2Y->chip.midi_list) {
		snd_usbmidi_input_stop(p);
	}
	unlink_err = usb_unlink_urb(usX2Y->In04urb);
	if ((err = usb_set_interface(usX2Y->chip.dev, 0, alternate))) {
		snd_printk("usb_set_interface error \n");
		return err;
	}
	if (0 == unlink_err) {
		usX2Y->In04urb->dev = usX2Y->chip.dev;
		err = usb_submit_urb(usX2Y->In04urb, GFP_KERNEL);
	}
	list_for_each(p, &usX2Y->chip.midi_list) {
		snd_usbmidi_input_start(p);
	}
	usX2Y->format = format;
	usX2Y->rate = 0;
	return err;
}


static int snd_usX2Y_pcm_hw_params(snd_pcm_substream_t *substream,
				   snd_pcm_hw_params_t *hw_params)
{
	int			err = 0;
	unsigned int		rate = params_rate(hw_params);
	snd_pcm_format_t	format = params_format(hw_params);
	snd_printdd("snd_usX2Y_hw_params(%p, %p)\n", substream, hw_params);

	{	// all pcm substreams off one usX2Y have to operate at the same rate & format
		snd_card_t *card = substream->pstr->pcm->card;
		struct list_head *list;
		list_for_each(list, &card->devices) {
			snd_device_t *dev;
			snd_pcm_t *pcm;
			int s;
			dev = snd_device(list);
			if (dev->type != SNDRV_DEV_PCM)
				continue;
			pcm = dev->device_data;
			for (s = 0; s < 2; ++s) {
				snd_pcm_substream_t *test_substream;
				test_substream = pcm->streams[s].substream;
				if (test_substream && test_substream != substream  &&
				    test_substream->runtime &&
				    ((test_substream->runtime->format &&
				      test_substream->runtime->format != format) ||
				     (test_substream->runtime->rate &&
				      test_substream->runtime->rate != rate)))
					return -EINVAL;
			}
		}
	}
	if (0 > (err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)))) {
		snd_printk("snd_pcm_lib_malloc_pages(%p, %i) returned %i\n", substream, params_buffer_bytes(hw_params), err);
		return err;
	}
	return 0;
}

/*
 * free the buffer
 */
static int snd_usX2Y_pcm_hw_free(snd_pcm_substream_t *substream)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_usX2Y_substream_t *subs = (snd_usX2Y_substream_t *)runtime->private_data;
	snd_printdd("snd_usX2Y_hw_free(%p)\n", substream);

	if (SNDRV_PCM_STREAM_PLAYBACK == substream->stream) {
		snd_usX2Y_substream_t *cap_subs = subs->usX2Y->substream[SNDRV_PCM_STREAM_CAPTURE];
		subs->prepared = 0;
		usX2Y_urbs_release(subs);
		if (!cap_subs->pcm_substream ||
		    !cap_subs->pcm_substream->runtime ||
		    !cap_subs->pcm_substream->runtime->status ||
		    cap_subs->pcm_substream->runtime->status->state < SNDRV_PCM_STATE_PREPARED) {
			cap_subs->prepared = 0;
			usX2Y_urbs_release(cap_subs);
		}
	} else {
		snd_usX2Y_substream_t *playback_subs = subs->usX2Y->substream[SNDRV_PCM_STREAM_PLAYBACK];
		if (!playback_subs->prepared) {
			subs->prepared = 0;
			usX2Y_urbs_release(subs);
		}
	}

	return snd_pcm_lib_free_pages(substream);
}
/*
 * prepare callback
 *
 * set format and initialize urbs
 */
static int snd_usX2Y_pcm_prepare(snd_pcm_substream_t *substream)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_usX2Y_substream_t *subs = (snd_usX2Y_substream_t *)runtime->private_data;
	snd_usX2Y_substream_t *capsubs = subs->usX2Y->substream[SNDRV_PCM_STREAM_CAPTURE];
	int err = 0;
	snd_printdd("snd_usX2Y_pcm_prepare(%p)\n", substream);

// Start hardware streams
// SyncStream first....
	if (! capsubs->prepared) {
		if (subs->usX2Y->format != runtime->format)
			if ((err = usX2Y_format_set(subs->usX2Y, runtime->format)) < 0)
				return err;
		if (subs->usX2Y->rate != runtime->rate)
			if ((err = usX2Y_rate_set(subs->usX2Y, runtime->rate)) < 0)
				return err;
		snd_printdd("starting capture pipe for playpipe\n");
		usX2Y_urbs_allocate(capsubs);
		capsubs->completed_urb = NULL;
		{
			DECLARE_WAITQUEUE(wait, current);
			add_wait_queue(&capsubs->wait_queue, &wait);
			if (0 <= (err = usX2Y_urbs_capt_start(capsubs))) {
				signed long timeout;
				set_current_state(TASK_INTERRUPTIBLE);
				timeout = schedule_timeout(HZ/4);
				if (signal_pending(current))
					err = -ERESTARTSYS;
				else {
					snd_printdd("%li\n", HZ/4 - timeout);
					if (0 == timeout)
						err = -EPIPE;
				}
			}
			remove_wait_queue(&capsubs->wait_queue, &wait);
			if (0 > err)
				return err;
		}
	}

	if (subs != capsubs) {
		int u;
		if (!subs->prepared) {
			if ((err = usX2Y_urbs_allocate(subs)) < 0)
				return err;
			subs->prepared = 1;
		}
		while (subs->submitted_urbs)
		for (u = 0; u < NRURBS; u++) {
			snd_printdd("%i\n", subs->urb[u]->status);
			while(subs->urb[u]->status  ||  NULL != subs->urb[u]->hcpriv) {
				signed long timeout;
				snd_printdd("ep=%i waiting for urb=%p status=%i hcpriv=%p\n",
					   subs->endpoint, subs->urb[u],
					   subs->urb[u]->status, subs->urb[u]->hcpriv);
				set_current_state(TASK_INTERRUPTIBLE);
				timeout = schedule_timeout(HZ/10);
				if (signal_pending(current)) {
					return -ERESTARTSYS;
				}
			}
		}
		subs->completed_urb = NULL;
		subs->next_urb_complete = -1;
		subs->stalled = 0;
	}

	usX2Y_substream_prepare(subs);
	return err;
}

static snd_pcm_hardware_t snd_usX2Y_2c =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE,
	.rates =                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
	.rate_min =                44100,
	.rate_max =                48000,
	.channels_min =            2,
	.channels_max =            2,
	.buffer_bytes_max =	(2*128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		2,
	.periods_max =		1024,
	.fifo_size =              0
};



static int snd_usX2Y_pcm_open(snd_pcm_substream_t *substream)
{
	snd_usX2Y_substream_t	*subs = ((snd_usX2Y_substream_t **)
					 snd_pcm_substream_chip(substream))[substream->stream];
	snd_pcm_runtime_t	*runtime = substream->runtime;

	runtime->hw = snd_usX2Y_2c;
	runtime->private_data = subs;
	subs->pcm_substream = substream;
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1000, 200000);
	return 0;
}



static int snd_usX2Y_pcm_close(snd_pcm_substream_t *substream)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_usX2Y_substream_t *subs = (snd_usX2Y_substream_t *)runtime->private_data;
	int err = 0;

	subs->pcm_substream = NULL;

	return err;
}


static snd_pcm_ops_t snd_usX2Y_pcm_ops = 
{
	.open =		snd_usX2Y_pcm_open,
	.close =	snd_usX2Y_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_usX2Y_pcm_hw_params,
	.hw_free =	snd_usX2Y_pcm_hw_free,
	.prepare =	snd_usX2Y_pcm_prepare,
	.trigger =	snd_usX2Y_pcm_trigger,
	.pointer =	snd_usX2Y_pcm_pointer,
};


/*
 * free a usb stream instance
 */
static void usX2Y_audio_stream_free(snd_usX2Y_substream_t **usX2Y_substream)
{
	if (NULL != usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]) {
		kfree(usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]);
		usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK] = NULL;
	}
	kfree(usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE]);
	usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE] = NULL;
}

static void snd_usX2Y_pcm_private_free(snd_pcm_t *pcm)
{
	snd_usX2Y_substream_t **usX2Y_stream = pcm->private_data;
	if (usX2Y_stream) {
		snd_pcm_lib_preallocate_free_for_all(pcm);
		usX2Y_audio_stream_free(usX2Y_stream);
	}
}

static int usX2Y_audio_stream_new(snd_card_t *card, int playback_endpoint, int capture_endpoint)
{
	snd_pcm_t *pcm;
	int err, i;
	snd_usX2Y_substream_t **usX2Y_substream =
		usX2Y(card)->substream + 2 * usX2Y(card)->chip.pcm_devs;

	for (i = playback_endpoint ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
	     i <= SNDRV_PCM_STREAM_CAPTURE; ++i) {
		usX2Y_substream[i] = kcalloc(1, sizeof(snd_usX2Y_substream_t), GFP_KERNEL);
		if (NULL == usX2Y_substream[i]) {
			snd_printk(KERN_ERR "cannot malloc\n");
			return -ENOMEM;
		}
		init_waitqueue_head(&usX2Y_substream[i]->wait_queue);
		usX2Y_substream[i]->usX2Y = usX2Y(card);
	}

	if (playback_endpoint)
		usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]->endpoint = playback_endpoint;
	usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE]->endpoint = capture_endpoint;

	err = snd_pcm_new(card, NAME_ALLCAPS" Audio", usX2Y(card)->chip.pcm_devs,
			  playback_endpoint ? 1 : 0, 1,
			  &pcm);
	if (err < 0) {
		usX2Y_audio_stream_free(usX2Y_substream);
		return err;
	}

	if (playback_endpoint)
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_usX2Y_pcm_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usX2Y_pcm_ops);

	pcm->private_data = usX2Y_substream;
	pcm->private_free = snd_usX2Y_pcm_private_free;
	pcm->info_flags = 0;

	sprintf(pcm->name, NAME_ALLCAPS" Audio #%d", usX2Y(card)->chip.pcm_devs);

	if ((playback_endpoint &&
	     0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
						     SNDRV_DMA_TYPE_CONTINUOUS,
						     snd_dma_continuous_data(GFP_KERNEL),
						     64*1024, 128*1024))) ||
	    0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
	    					     SNDRV_DMA_TYPE_CONTINUOUS,
	    					     snd_dma_continuous_data(GFP_KERNEL),
						     64*1024, 128*1024))) {
		snd_usX2Y_pcm_private_free(pcm);
		return err;
	}
	usX2Y(card)->chip.pcm_devs++;

	return 0;
}

/*
 * free the chip instance
 *
 * here we have to do not much, since pcm and controls are already freed
 *
 */
static int snd_usX2Y_device_dev_free(snd_device_t *device)
{
	return 0;
}


/*
 * create a chip instance and set its names.
 */
int usX2Y_audio_create(snd_card_t* card)
{
	int err = 0;
	static snd_device_ops_t ops = {
		.dev_free = snd_usX2Y_device_dev_free,
	};
	
	INIT_LIST_HEAD(&usX2Y(card)->chip.pcm_list);

	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, usX2Y(card), &ops)) < 0) {
//		snd_usX2Y_audio_free(usX2Y(card));
		return err;
	}

	if (0 > (err = usX2Y_audio_stream_new(card, 0xA, 0x8)))
		return err;
	if (usX2Y(card)->chip.dev->descriptor.idProduct == USB_ID_US428)
	     if (0 > (err = usX2Y_audio_stream_new(card, 0, 0xA)))
		     return err;
	if (usX2Y(card)->chip.dev->descriptor.idProduct != USB_ID_US122)
		err = usX2Y_rate_set(usX2Y(card), 44100);	// Lets us428 recognize output-volume settings, disturbs us122.
	return err;
}