[net-next-2.6.git] / drivers / media / video / em28xx / em28xx-audio.c

/*
 *  Empiatech em28x1 audio extension
 *
 *  Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
 *
 *  Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
 *	- Port to work with the in-kernel driver
 *	- Several cleanups
 *
 *  This driver is based on my previous au600 usb pstn audio driver
 *  and inherits all the copyrights
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/init.h>
#include <linux/sound.h>
#include <linux/spinlock.h>
#include <linux/soundcard.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/proc_fs.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/info.h>
#include <sound/initval.h>
#include <sound/control.h>
#include <media/v4l2-common.h>
#include "em28xx.h"

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "activates debug info");

#define dprintk(fmt, arg...) do {					\
	    if (debug)							\
		printk(KERN_INFO "em28xx-audio %s: " fmt,		\
				  __func__, ##arg); 		\
	} while (0)

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;

static int em28xx_deinit_isoc_audio(struct em28xx *dev)
{
	int i;

	dprintk("Stopping isoc\n");
	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
		if (!irqs_disabled())
			usb_kill_urb(dev->adev.urb[i]);
		else
			usb_unlink_urb(dev->adev.urb[i]);

		usb_free_urb(dev->adev.urb[i]);
		dev->adev.urb[i] = NULL;

		kfree(dev->adev.transfer_buffer[i]);
		dev->adev.transfer_buffer[i] = NULL;
	}

	return 0;
}

static void em28xx_audio_isocirq(struct urb *urb)
{
	struct em28xx            *dev = urb->context;
	int                      i;
	unsigned int             oldptr;
	int                      period_elapsed = 0;
	int                      status;
	unsigned char            *cp;
	unsigned int             stride;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime   *runtime;

	switch (urb->status) {
	case 0:             /* success */
	case -ETIMEDOUT:    /* NAK */
		break;
	case -ECONNRESET:   /* kill */
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	default:            /* error */
		dprintk("urb completition error %d.\n", urb->status);
		break;
	}

	if (atomic_read(&dev->stream_started) == 0)
		return;

	if (dev->adev.capture_pcm_substream) {
		substream = dev->adev.capture_pcm_substream;
		runtime = substream->runtime;
		stride = runtime->frame_bits >> 3;

		for (i = 0; i < urb->number_of_packets; i++) {
			int length =
			    urb->iso_frame_desc[i].actual_length / stride;
			cp = (unsigned char *)urb->transfer_buffer +
			    urb->iso_frame_desc[i].offset;

			if (!length)
				continue;

			oldptr = dev->adev.hwptr_done_capture;
			if (oldptr + length >= runtime->buffer_size) {
				unsigned int cnt =
				    runtime->buffer_size - oldptr;
				memcpy(runtime->dma_area + oldptr * stride, cp,
				       cnt * stride);
				memcpy(runtime->dma_area, cp + cnt * stride,
				       length * stride - cnt * stride);
			} else {
				memcpy(runtime->dma_area + oldptr * stride, cp,
				       length * stride);
			}

			snd_pcm_stream_lock(substream);

			dev->adev.hwptr_done_capture += length;
			if (dev->adev.hwptr_done_capture >=
			    runtime->buffer_size)
				dev->adev.hwptr_done_capture -=
				    runtime->buffer_size;

			dev->adev.capture_transfer_done += length;
			if (dev->adev.capture_transfer_done >=
			    runtime->period_size) {
				dev->adev.capture_transfer_done -=
				    runtime->period_size;
				period_elapsed = 1;
			}

			snd_pcm_stream_unlock(substream);
		}
		if (period_elapsed)
			snd_pcm_period_elapsed(substream);
	}
	urb->status = 0;

	status = usb_submit_urb(urb, GFP_ATOMIC);
	if (status < 0) {
		em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
			      status);
	}
	return;
}

static int em28xx_init_audio_isoc(struct em28xx *dev)
{
	int       i, errCode;
	const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
			    EM28XX_AUDIO_MAX_PACKET_SIZE;

	dprintk("Starting isoc transfers\n");

	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
		struct urb *urb;
		int j, k;

		dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
		if (!dev->adev.transfer_buffer[i])
			return -ENOMEM;

		memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
		urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
		if (!urb) {
			em28xx_errdev("usb_alloc_urb failed!\n");
			for (j = 0; j < i; j++) {
				usb_free_urb(dev->adev.urb[j]);
				kfree(dev->adev.transfer_buffer[j]);
			}
			return -ENOMEM;
		}

		urb->dev = dev->udev;
		urb->context = dev;
		urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
		urb->transfer_flags = URB_ISO_ASAP;
		urb->transfer_buffer = dev->adev.transfer_buffer[i];
		urb->interval = 1;
		urb->complete = em28xx_audio_isocirq;
		urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
		urb->transfer_buffer_length = sb_size;

		for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
			     j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
			urb->iso_frame_desc[j].offset = k;
			urb->iso_frame_desc[j].length =
			    EM28XX_AUDIO_MAX_PACKET_SIZE;
		}
		dev->adev.urb[i] = urb;
	}

	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
		errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
		if (errCode) {
			em28xx_deinit_isoc_audio(dev);
			return errCode;
		}
	}

	return 0;
}

static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
					size_t size)
{
	struct snd_pcm_runtime *runtime = subs->runtime;

	dprintk("Allocating vbuffer\n");
	if (runtime->dma_area) {
		if (runtime->dma_bytes > size)
			return 0;

		vfree(runtime->dma_area);
	}
	runtime->dma_area = vmalloc(size);
	if (!runtime->dma_area)
		return -ENOMEM;

	runtime->dma_bytes = size;

	return 0;
}

static struct snd_pcm_hardware snd_em28xx_hw_capture = {
	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_MMAP           |
		SNDRV_PCM_INFO_INTERLEAVED    |
		SNDRV_PCM_INFO_MMAP_VALID,

	.formats = SNDRV_PCM_FMTBIT_S16_LE,

	.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,

	.rate_min = 48000,
	.rate_max = 48000,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = 62720 * 8,	/* just about the value in usbaudio.c */
	.period_bytes_min = 64,		/* 12544/2, */
	.period_bytes_max = 12544,
	.periods_min = 2,
	.periods_max = 98,		/* 12544, */
};

static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
{
	struct em28xx *dev = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int ret = 0;

	dprintk("opening device and trying to acquire exclusive lock\n");

	if (!dev) {
		em28xx_err("BUG: em28xx can't find device struct."
				" Can't proceed with open\n");
		return -ENODEV;
	}

	/* Sets volume, mute, etc */

	dev->mute = 0;
	mutex_lock(&dev->lock);
	ret = em28xx_audio_analog_set(dev);
	if (ret < 0)
		goto err;

	runtime->hw = snd_em28xx_hw_capture;
	if (dev->alt == 0 && dev->adev.users == 0) {
		int errCode;
		dev->alt = 7;
		dprintk("changing alternate number to 7\n");
		errCode = usb_set_interface(dev->udev, 0, 7);
	}

	dev->adev.users++;
	mutex_unlock(&dev->lock);

	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	dev->adev.capture_pcm_substream = substream;
	runtime->private_data = dev;

	return 0;
err:
	mutex_unlock(&dev->lock);

	em28xx_err("Error while configuring em28xx mixer\n");
	return ret;
}

static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
{
	struct em28xx *dev = snd_pcm_substream_chip(substream);

	dprintk("closing device\n");

	dev->mute = 1;
	mutex_lock(&dev->lock);
	dev->adev.users--;
	if (atomic_read(&dev->stream_started) > 0) {
		atomic_set(&dev->stream_started, 0);
		schedule_work(&dev->wq_trigger);
	}

	em28xx_audio_analog_set(dev);
	if (substream->runtime->dma_area) {
		dprintk("freeing\n");
		vfree(substream->runtime->dma_area);
		substream->runtime->dma_area = NULL;
	}
	mutex_unlock(&dev->lock);

	return 0;
}

static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
					struct snd_pcm_hw_params *hw_params)
{
	unsigned int channels, rate, format;
	int ret;

	dprintk("Setting capture parameters\n");

	ret = snd_pcm_alloc_vmalloc_buffer(substream,
				params_buffer_bytes(hw_params));
	format = params_format(hw_params);
	rate = params_rate(hw_params);
	channels = params_channels(hw_params);

	/* TODO: set up em28xx audio chip to deliver the correct audio format,
	   current default is 48000hz multiplexed => 96000hz mono
	   which shouldn't matter since analogue TV only supports mono */
	return 0;
}

static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
{
	struct em28xx *dev = snd_pcm_substream_chip(substream);

	dprintk("Stop capture, if needed\n");

	if (atomic_read(&dev->stream_started) > 0) {
		atomic_set(&dev->stream_started, 0);
		schedule_work(&dev->wq_trigger);
	}

	return 0;
}

static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
{
	struct em28xx *dev = snd_pcm_substream_chip(substream);

	dev->adev.hwptr_done_capture = 0;
	dev->adev.capture_transfer_done = 0;

	return 0;
}

static void audio_trigger(struct work_struct *work)
{
	struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);

	if (atomic_read(&dev->stream_started)) {
		dprintk("starting capture");
		em28xx_init_audio_isoc(dev);
	} else {
		dprintk("stopping capture");
		em28xx_deinit_isoc_audio(dev);
	}
}

static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
				      int cmd)
{
	struct em28xx *dev = snd_pcm_substream_chip(substream);
	int retval;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		atomic_set(&dev->stream_started, 1);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		atomic_set(&dev->stream_started, 1);
		break;
	default:
		retval = -EINVAL;
	}
	schedule_work(&dev->wq_trigger);
	return 0;
}

static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
						    *substream)
{
	unsigned long flags;
	struct em28xx *dev;
	snd_pcm_uframes_t hwptr_done;

	dev = snd_pcm_substream_chip(substream);
	spin_lock_irqsave(&dev->adev.slock, flags);
	hwptr_done = dev->adev.hwptr_done_capture;
	spin_unlock_irqrestore(&dev->adev.slock, flags);

	return hwptr_done;
}

static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
					     unsigned long offset)
{
	void *pageptr = subs->runtime->dma_area + offset;

	return vmalloc_to_page(pageptr);
}

static struct snd_pcm_ops snd_em28xx_pcm_capture = {
	.open      = snd_em28xx_capture_open,
	.close     = snd_em28xx_pcm_close,
	.ioctl     = snd_pcm_lib_ioctl,
	.hw_params = snd_em28xx_hw_capture_params,
	.hw_free   = snd_em28xx_hw_capture_free,
	.prepare   = snd_em28xx_prepare,
	.trigger   = snd_em28xx_capture_trigger,
	.pointer   = snd_em28xx_capture_pointer,
	.page      = snd_pcm_get_vmalloc_page,
};

static int em28xx_audio_init(struct em28xx *dev)
{
	struct em28xx_audio *adev = &dev->adev;
	struct snd_pcm      *pcm;
	struct snd_card     *card;
	static int          devnr;
	int                 err;

	if (dev->has_alsa_audio != 1) {
		/* This device does not support the extension (in this case
		   the device is expecting the snd-usb-audio module or
		   doesn't have analog audio support at all) */
		return 0;
	}

	printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
			 "non standard usbaudio\n");
	printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
			 "Rechberger\n");

	err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
			      &card);
	if (err < 0)
		return err;

	spin_lock_init(&adev->slock);
	err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
	if (err < 0) {
		snd_card_free(card);
		return err;
	}

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
	pcm->info_flags = 0;
	pcm->private_data = dev;
	strcpy(pcm->name, "Empia 28xx Capture");

	snd_card_set_dev(card, &dev->udev->dev);
	strcpy(card->driver, "Em28xx-Audio");
	strcpy(card->shortname, "Em28xx Audio");
	strcpy(card->longname, "Empia Em28xx Audio");

	INIT_WORK(&dev->wq_trigger, audio_trigger);

	err = snd_card_register(card);
	if (err < 0) {
		snd_card_free(card);
		return err;
	}
	adev->sndcard = card;
	adev->udev = dev->udev;

	return 0;
}

static int em28xx_audio_fini(struct em28xx *dev)
{
	if (dev == NULL)
		return 0;

	if (dev->has_alsa_audio != 1) {
		/* This device does not support the extension (in this case
		   the device is expecting the snd-usb-audio module or
		   doesn't have analog audio support at all) */
		return 0;
	}

	if (dev->adev.sndcard) {
		snd_card_free(dev->adev.sndcard);
		dev->adev.sndcard = NULL;
	}

	return 0;
}

static struct em28xx_ops audio_ops = {
	.id   = EM28XX_AUDIO,
	.name = "Em28xx Audio Extension",
	.init = em28xx_audio_init,
	.fini = em28xx_audio_fini,
};

static int __init em28xx_alsa_register(void)
{
	return em28xx_register_extension(&audio_ops);
}

static void __exit em28xx_alsa_unregister(void)
{
	em28xx_unregister_extension(&audio_ops);
}

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
MODULE_DESCRIPTION("Em28xx Audio driver");

module_init(em28xx_alsa_register);
module_exit(em28xx_alsa_unregister);
Commit	Line	Data
a52932b4 MR	1	/*
	2	* Empiatech em28x1 audio extension
	3	*
	4	* Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
	5	*
6d79468d MCC	6	* Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
	7	* - Port to work with the in-kernel driver
	8	* - Several cleanups
	9	*
a52932b4 MR	10	* This driver is based on my previous au600 usb pstn audio driver
	11	* and inherits all the copyrights
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, write to the Free Software
	25	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	26	*/
	27
	28	#include <linux/kernel.h>
	29	#include <linux/usb.h>
	30	#include <linux/init.h>
	31	#include <linux/sound.h>
	32	#include <linux/spinlock.h>
	33	#include <linux/soundcard.h>
	34	#include <linux/slab.h>
	35	#include <linux/vmalloc.h>
	36	#include <linux/proc_fs.h>
6d79468d	37	#include <linux/module.h>
a52932b4 MR	38	#include <sound/core.h>
	39	#include <sound/pcm.h>
	40	#include <sound/pcm_params.h>
	41	#include <sound/info.h>
	42	#include <sound/initval.h>
	43	#include <sound/control.h>
a52932b4 MR	44	#include <media/v4l2-common.h>
	45	#include "em28xx.h"
	46
6d79468d MCC	47	static int debug;
	48	module_param(debug, int, 0644);
	49	MODULE_PARM_DESC(debug, "activates debug info");
a52932b4	50
6d79468d MCC	51	#define dprintk(fmt, arg...) do { \
	52	if (debug) \
	53	printk(KERN_INFO "em28xx-audio %s: " fmt, \
d80e134d	54	__func__, ##arg); \
6d79468d	55	} while (0)
a52932b4	56
6d79468d	57	static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
a52932b4	58
aa5a1821	59	static int em28xx_deinit_isoc_audio(struct em28xx *dev)
a52932b4	60	{
6d79468d	61	int i;
a52932b4	62
6d79468d	63	dprintk("Stopping isoc\n");
3e099baf	64	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
9c06210b RK	65	if (!irqs_disabled())
	66	usb_kill_urb(dev->adev.urb[i]);
	67	else
	68	usb_unlink_urb(dev->adev.urb[i]);
aa5a1821	69
9baed99e MCC	70	usb_free_urb(dev->adev.urb[i]);
9baed99e MCC	71	dev->adev.urb[i] = NULL;
53d12e5a	72
9c06210b RK	73	kfree(dev->adev.transfer_buffer[i]);
9c06210b RK	74	dev->adev.transfer_buffer[i] = NULL;
a52932b4	75	}
a52932b4	76
a52932b4 MR	77	return 0;
	78	}
	79
a52932b4 MR	80	static void em28xx_audio_isocirq(struct urb *urb)
a52932b4 MR	81	{
6d79468d MCC	82	struct em28xx *dev = urb->context;
	83	int i;
	84	unsigned int oldptr;
6d79468d MCC	85	int period_elapsed = 0;
	86	int status;
	87	unsigned char *cp;
	88	unsigned int stride;
a52932b4	89	struct snd_pcm_substream *substream;
6d79468d	90	struct snd_pcm_runtime *runtime;
aa5a1821 RK	91
	92	switch (urb->status) {
	93	case 0: /* success */
	94	case -ETIMEDOUT: /* NAK */
	95	break;
	96	case -ECONNRESET: /* kill */
	97	case -ENOENT:
	98	case -ESHUTDOWN:
	99	return;
	100	default: /* error */
	101	dprintk("urb completition error %d.\n", urb->status);
	102	break;
	103	}
	104
39a96b4c MCC	105	if (atomic_read(&dev->stream_started) == 0)
	106	return;
	107
9baed99e MCC	108	if (dev->adev.capture_pcm_substream) {
9baed99e MCC	109	substream = dev->adev.capture_pcm_substream;
1a6f11e0	110	runtime = substream->runtime;
a52932b4	111	stride = runtime->frame_bits >> 3;
6d79468d	112
1a6f11e0 MCC	113	for (i = 0; i < urb->number_of_packets; i++) {
	114	int length =
	115	urb->iso_frame_desc[i].actual_length / stride;
	116	cp = (unsigned char *)urb->transfer_buffer +
	117	urb->iso_frame_desc[i].offset;
a52932b4	118
1a6f11e0	119	if (!length)
a52932b4 MR	120	continue;
a52932b4 MR	121
9baed99e	122	oldptr = dev->adev.hwptr_done_capture;
50f3beb5 MCC	123	if (oldptr + length >= runtime->buffer_size) {
	124	unsigned int cnt =
	125	runtime->buffer_size - oldptr;
	126	memcpy(runtime->dma_area + oldptr * stride, cp,
	127	cnt * stride);
	128	memcpy(runtime->dma_area, cp + cnt * stride,
	129	length * stride - cnt * stride);
	130	} else {
	131	memcpy(runtime->dma_area + oldptr * stride, cp,
	132	length * stride);
	133	}
	134
50f3beb5	135	snd_pcm_stream_lock(substream);
50f3beb5	136
9baed99e MCC	137	dev->adev.hwptr_done_capture += length;
9baed99e MCC	138	if (dev->adev.hwptr_done_capture >=
1a6f11e0	139	runtime->buffer_size)
9baed99e	140	dev->adev.hwptr_done_capture -=
1a6f11e0	141	runtime->buffer_size;
a52932b4	142
9baed99e MCC	143	dev->adev.capture_transfer_done += length;
9baed99e MCC	144	if (dev->adev.capture_transfer_done >=
1a6f11e0	145	runtime->period_size) {
9baed99e	146	dev->adev.capture_transfer_done -=
1a6f11e0 MCC	147	runtime->period_size;
1a6f11e0 MCC	148	period_elapsed = 1;
a52932b4	149	}
6d79468d	150
50f3beb5	151	snd_pcm_stream_unlock(substream);
a52932b4	152	}
6d79468d	153	if (period_elapsed)
a52932b4	154	snd_pcm_period_elapsed(substream);
a52932b4 MR	155	}
a52932b4 MR	156	urb->status = 0;
1a6f11e0	157
6d79468d MCC	158	status = usb_submit_urb(urb, GFP_ATOMIC);
6d79468d MCC	159	if (status < 0) {
1a6f11e0 MCC	160	em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
1a6f11e0 MCC	161	status);
a52932b4 MR	162	}
	163	return;
	164	}
	165
a52932b4 MR	166	static int em28xx_init_audio_isoc(struct em28xx *dev)
a52932b4 MR	167	{
6d79468d MCC	168	int i, errCode;
	169	const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
	170	EM28XX_AUDIO_MAX_PACKET_SIZE;
	171
	172	dprintk("Starting isoc transfers\n");
a52932b4	173
1a6f11e0	174	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
a52932b4	175	struct urb *urb;
1a6f11e0	176	int j, k;
6d79468d	177
9baed99e MCC	178	dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
9baed99e MCC	179	if (!dev->adev.transfer_buffer[i])
a52932b4	180	return -ENOMEM;
6d79468d	181
9baed99e	182	memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
1a6f11e0	183	urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
ff9b3e43 DSL	184	if (!urb) {
	185	em28xx_errdev("usb_alloc_urb failed!\n");
	186	for (j = 0; j < i; j++) {
9baed99e MCC	187	usb_free_urb(dev->adev.urb[j]);
9baed99e MCC	188	kfree(dev->adev.transfer_buffer[j]);
ff9b3e43	189	}
a52932b4	190	return -ENOMEM;
ff9b3e43	191	}
6d79468d MCC	192
	193	urb->dev = dev->udev;
	194	urb->context = dev;
	195	urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
	196	urb->transfer_flags = URB_ISO_ASAP;
9baed99e	197	urb->transfer_buffer = dev->adev.transfer_buffer[i];
6d79468d MCC	198	urb->interval = 1;
	199	urb->complete = em28xx_audio_isocirq;
	200	urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
	201	urb->transfer_buffer_length = sb_size;
	202
	203	for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
	204	j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
	205	urb->iso_frame_desc[j].offset = k;
	206	urb->iso_frame_desc[j].length =
	207	EM28XX_AUDIO_MAX_PACKET_SIZE;
a52932b4	208	}
9baed99e	209	dev->adev.urb[i] = urb;
a52932b4	210	}
6d79468d	211
1a6f11e0	212	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
9baed99e	213	errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
1a6f11e0	214	if (errCode) {
aa5a1821	215	em28xx_deinit_isoc_audio(dev);
a52932b4 MR	216	return errCode;
	217	}
	218	}
6d79468d	219
a52932b4 MR	220	return 0;
	221	}
	222
6d79468d MCC	223	static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
	224	size_t size)
	225	{
	226	struct snd_pcm_runtime *runtime = subs->runtime;
	227
a1a6ee74	228	dprintk("Allocating vbuffer\n");
6d79468d MCC	229	if (runtime->dma_area) {
	230	if (runtime->dma_bytes > size)
	231	return 0;
	232
	233	vfree(runtime->dma_area);
	234	}
	235	runtime->dma_area = vmalloc(size);
	236	if (!runtime->dma_area)
	237	return -ENOMEM;
	238
	239	runtime->dma_bytes = size;
	240
	241	return 0;
	242	}
	243
	244	static struct snd_pcm_hardware snd_em28xx_hw_capture = {
	245	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	246	SNDRV_PCM_INFO_MMAP \|
	247	SNDRV_PCM_INFO_INTERLEAVED \|
	248	SNDRV_PCM_INFO_MMAP_VALID,
	249
	250	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	251
	252	.rates = SNDRV_PCM_RATE_CONTINUOUS \| SNDRV_PCM_RATE_KNOT,
	253
	254	.rate_min = 48000,
	255	.rate_max = 48000,
	256	.channels_min = 2,
	257	.channels_max = 2,
	258	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
	259	.period_bytes_min = 64, /* 12544/2, */
	260	.period_bytes_max = 12544,
	261	.periods_min = 2,
	262	.periods_max = 98, /* 12544, */
	263	};
	264
	265	static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
	266	{
	267	struct em28xx *dev = snd_pcm_substream_chip(substream);
	268	struct snd_pcm_runtime *runtime = substream->runtime;
	269	int ret = 0;
	270
	271	dprintk("opening device and trying to acquire exclusive lock\n");
	272
83ee87a3	273	if (!dev) {
0bc23083	274	em28xx_err("BUG: em28xx can't find device struct."
83ee87a3 MCC	275	" Can't proceed with open\n");
	276	return -ENODEV;
	277	}
	278
6d79468d	279	/* Sets volume, mute, etc */
92ea42f4	280
6d79468d	281	dev->mute = 0;
92ea42f4	282	mutex_lock(&dev->lock);
6d79468d MCC	283	ret = em28xx_audio_analog_set(dev);
	284	if (ret < 0)
	285	goto err;
	286
	287	runtime->hw = snd_em28xx_hw_capture;
9baed99e	288	if (dev->alt == 0 && dev->adev.users == 0) {
6d79468d MCC	289	int errCode;
6d79468d MCC	290	dev->alt = 7;
6d79468d	291	dprintk("changing alternate number to 7\n");
39a96b4c	292	errCode = usb_set_interface(dev->udev, 0, 7);
6d79468d MCC	293	}
6d79468d MCC	294
9baed99e	295	dev->adev.users++;
bf510ac3	296	mutex_unlock(&dev->lock);
6d79468d MCC	297
6d79468d MCC	298	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
9baed99e	299	dev->adev.capture_pcm_substream = substream;
6d79468d MCC	300	runtime->private_data = dev;
	301
	302	return 0;
	303	err:
39a96b4c MCC	304	mutex_unlock(&dev->lock);
39a96b4c MCC	305
0bc23083	306	em28xx_err("Error while configuring em28xx mixer\n");
6d79468d MCC	307	return ret;
	308	}
	309
	310	static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
	311	{
	312	struct em28xx *dev = snd_pcm_substream_chip(substream);
6d79468d MCC	313
	314	dprintk("closing device\n");
	315
	316	dev->mute = 1;
92ea42f4	317	mutex_lock(&dev->lock);
bf510ac3	318	dev->adev.users--;
39a96b4c MCC	319	if (atomic_read(&dev->stream_started) > 0) {
	320	atomic_set(&dev->stream_started, 0);
	321	schedule_work(&dev->wq_trigger);
	322	}
	323
6d79468d	324	em28xx_audio_analog_set(dev);
75c74d1c RK	325	if (substream->runtime->dma_area) {
	326	dprintk("freeing\n");
	327	vfree(substream->runtime->dma_area);
	328	substream->runtime->dma_area = NULL;
	329	}
92ea42f4	330	mutex_unlock(&dev->lock);
6d79468d	331
6d79468d MCC	332	return 0;
	333	}
	334
	335	static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
	336	struct snd_pcm_hw_params *hw_params)
	337	{
	338	unsigned int channels, rate, format;
	339	int ret;
	340
	341	dprintk("Setting capture parameters\n");
	342
	343	ret = snd_pcm_alloc_vmalloc_buffer(substream,
	344	params_buffer_bytes(hw_params));
	345	format = params_format(hw_params);
	346	rate = params_rate(hw_params);
	347	channels = params_channels(hw_params);
	348
	349	/* TODO: set up em28xx audio chip to deliver the correct audio format,
	350	current default is 48000hz multiplexed => 96000hz mono
	351	which shouldn't matter since analogue TV only supports mono */
	352	return 0;
	353	}
	354
	355	static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
	356	{
	357	struct em28xx *dev = snd_pcm_substream_chip(substream);
	358
	359	dprintk("Stop capture, if needed\n");
	360
39a96b4c MCC	361	if (atomic_read(&dev->stream_started) > 0) {
	362	atomic_set(&dev->stream_started, 0);
	363	schedule_work(&dev->wq_trigger);
	364	}
6d79468d MCC	365
	366	return 0;
	367	}
	368
	369	static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
	370	{
96fbf771 DH	371	struct em28xx *dev = snd_pcm_substream_chip(substream);
	372
	373	dev->adev.hwptr_done_capture = 0;
	374	dev->adev.capture_transfer_done = 0;
	375
6d79468d MCC	376	return 0;
	377	}
	378
39a96b4c MCC	379	static void audio_trigger(struct work_struct *work)
	380	{
	381	struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
	382
	383	if (atomic_read(&dev->stream_started)) {
	384	dprintk("starting capture");
	385	em28xx_init_audio_isoc(dev);
	386	} else {
	387	dprintk("stopping capture");
	388	em28xx_deinit_isoc_audio(dev);
	389	}
	390	}
	391
6d79468d MCC	392	static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
	393	int cmd)
	394	{
	395	struct em28xx *dev = snd_pcm_substream_chip(substream);
df39ca64	396	int retval;
6d79468d	397
6d79468d MCC	398	switch (cmd) {
6d79468d MCC	399	case SNDRV_PCM_TRIGGER_START:
39a96b4c	400	atomic_set(&dev->stream_started, 1);
df39ca64	401	break;
6d79468d	402	case SNDRV_PCM_TRIGGER_STOP:
39a96b4c	403	atomic_set(&dev->stream_started, 1);
df39ca64	404	break;
6d79468d	405	default:
df39ca64	406	retval = -EINVAL;
6d79468d	407	}
39a96b4c MCC	408	schedule_work(&dev->wq_trigger);
39a96b4c MCC	409	return 0;
6d79468d MCC	410	}
6d79468d MCC	411
1a6f11e0 MCC	412	static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
1a6f11e0 MCC	413	*substream)
a52932b4	414	{
a1a6ee74	415	unsigned long flags;
53d12e5a	416	struct em28xx *dev;
a52932b4	417	snd_pcm_uframes_t hwptr_done;
53d12e5a	418
a52932b4	419	dev = snd_pcm_substream_chip(substream);
00bc0645	420	spin_lock_irqsave(&dev->adev.slock, flags);
9baed99e	421	hwptr_done = dev->adev.hwptr_done_capture;
00bc0645	422	spin_unlock_irqrestore(&dev->adev.slock, flags);
6d79468d	423
a52932b4 MR	424	return hwptr_done;
	425	}
	426
	427	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
	428	unsigned long offset)
	429	{
	430	void *pageptr = subs->runtime->dma_area + offset;
6d79468d	431
a52932b4 MR	432	return vmalloc_to_page(pageptr);
	433	}
	434
	435	static struct snd_pcm_ops snd_em28xx_pcm_capture = {
6d79468d MCC	436	.open = snd_em28xx_capture_open,
	437	.close = snd_em28xx_pcm_close,
	438	.ioctl = snd_pcm_lib_ioctl,
a52932b4	439	.hw_params = snd_em28xx_hw_capture_params,
6d79468d MCC	440	.hw_free = snd_em28xx_hw_capture_free,
	441	.prepare = snd_em28xx_prepare,
	442	.trigger = snd_em28xx_capture_trigger,
	443	.pointer = snd_em28xx_capture_pointer,
	444	.page = snd_pcm_get_vmalloc_page,
a52932b4 MR	445	};
a52932b4 MR	446
a52932b4 MR	447	static int em28xx_audio_init(struct em28xx *dev)
a52932b4 MR	448	{
9baed99e	449	struct em28xx_audio *adev = &dev->adev;
6d79468d MCC	450	struct snd_pcm *pcm;
	451	struct snd_card *card;
	452	static int devnr;
65c9fd46	453	int err;
6d79468d	454
24a613e4	455	if (dev->has_alsa_audio != 1) {
df619181	456	/* This device does not support the extension (in this case
24a613e4 DH	457	the device is expecting the snd-usb-audio module or
24a613e4 DH	458	doesn't have analog audio support at all) */
df619181 DH	459	return 0;
	460	}
	461
6d79468d MCC	462	printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
	463	"non standard usbaudio\n");
	464	printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
	465	"Rechberger\n");
	466
758021bf TI	467	err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
	468	&card);
	469	if (err < 0)
	470	return err;
a52932b4 MR	471
a52932b4 MR	472	spin_lock_init(&adev->slock);
1f6340bd MCC	473	err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
	474	if (err < 0) {
	475	snd_card_free(card);
	476	return err;
	477	}
	478
a52932b4 MR	479	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
	480	pcm->info_flags = 0;
	481	pcm->private_data = dev;
1a6f11e0	482	strcpy(pcm->name, "Empia 28xx Capture");
7662b00c NS	483
7662b00c NS	484	snd_card_set_dev(card, &dev->udev->dev);
4a3eaee4	485	strcpy(card->driver, "Em28xx-Audio");
a52932b4	486	strcpy(card->shortname, "Em28xx Audio");
1a6f11e0	487	strcpy(card->longname, "Empia Em28xx Audio");
a52932b4	488
39a96b4c MCC	489	INIT_WORK(&dev->wq_trigger, audio_trigger);
39a96b4c MCC	490
6d79468d MCC	491	err = snd_card_register(card);
6d79468d MCC	492	if (err < 0) {
a52932b4	493	snd_card_free(card);
1f6340bd	494	return err;
a52932b4	495	}
1a6f11e0 MCC	496	adev->sndcard = card;
1a6f11e0 MCC	497	adev->udev = dev->udev;
6d79468d	498
a52932b4 MR	499	return 0;
	500	}
	501
	502	static int em28xx_audio_fini(struct em28xx *dev)
	503	{
1a6f11e0	504	if (dev == NULL)
a52932b4	505	return 0;
6d79468d	506
24a613e4	507	if (dev->has_alsa_audio != 1) {
df619181	508	/* This device does not support the extension (in this case
24a613e4 DH	509	the device is expecting the snd-usb-audio module or
24a613e4 DH	510	doesn't have analog audio support at all) */
df619181 DH	511	return 0;
	512	}
	513
9baed99e MCC	514	if (dev->adev.sndcard) {
	515	snd_card_free(dev->adev.sndcard);
	516	dev->adev.sndcard = NULL;
a52932b4	517	}
6d79468d	518
a52932b4 MR	519	return 0;
	520	}
	521
	522	static struct em28xx_ops audio_ops = {
6d79468d	523	.id = EM28XX_AUDIO,
1a6f11e0 MCC	524	.name = "Em28xx Audio Extension",
	525	.init = em28xx_audio_init,
	526	.fini = em28xx_audio_fini,
a52932b4 MR	527	};
	528
	529	static int __init em28xx_alsa_register(void)
	530	{
a52932b4 MR	531	return em28xx_register_extension(&audio_ops);
	532	}
	533
	534	static void __exit em28xx_alsa_unregister(void)
	535	{
	536	em28xx_unregister_extension(&audio_ops);
	537	}
	538
	539	MODULE_LICENSE("GPL");
	540	MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
6d79468d	541	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
a52932b4 MR	542	MODULE_DESCRIPTION("Em28xx Audio driver");
	543
	544	module_init(em28xx_alsa_register);
	545	module_exit(em28xx_alsa_unregister);