[linux-block.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_isoc_audio_deinit(struct em28xx *dev)
{
	int i;

	dprintk("Stopping isoc\n");
	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
		usb_kill_urb(dev->adev->urb[i]);
		usb_free_urb(dev->adev->urb[i]);
		dev->adev->urb[i] = NULL;
	}

	return 0;
}

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

			spin_lock_irqsave(&dev->adev->slock, flags);

			oldptr = dev->adev->hwptr_done_capture;
			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;
			}

			spin_unlock_irqrestore(&dev->adev->slock, flags);

			if (oldptr + length >= runtime->buffer_size) {
				unsigned int cnt =
				    runtime->buffer_size - oldptr - 1;
				memcpy(runtime->dma_area + oldptr * stride, cp,
				       cnt * stride);
				memcpy(runtime->dma_area, cp + cnt,
				       length * stride - cnt * stride);
			} else {
				memcpy(runtime->dma_area + oldptr * stride, cp,
				       length * stride);
			}
		}
		if (period_elapsed)
			snd_pcm_period_elapsed(substream);
	}
	urb->status = 0;

	if (dev->adev->shutdown)
		return;

	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)
			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_isoc_audio_deinit(dev);

			return errCode;
		}
	}

	return 0;
}

static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
{
	dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
				 "stop" : "start");

	switch (cmd) {
	case EM28XX_CAPTURE_STREAM_EN:
		if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
			dev->adev->capture_stream = STREAM_ON;
			em28xx_init_audio_isoc(dev);
		} else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
			dev->adev->capture_stream = STREAM_OFF;
			em28xx_isoc_audio_deinit(dev);
		} else {
			printk(KERN_ERR "An underrun very likely occurred. "
					"Ignoring it.\n");
		}
		return 0;
	default:
		return -EINVAL;
	}
}

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

	dprintk("Alocating 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) {
		printk(KERN_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);
	mutex_unlock(&dev->lock);
	if (ret < 0)
		goto err;

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

	dev->adev->users++;

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

	return 0;
err:
	printk(KERN_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);
	dev->adev->users--;

	dprintk("closing device\n");

	dev->mute = 1;
	mutex_lock(&dev->lock);
	em28xx_audio_analog_set(dev);
	mutex_unlock(&dev->lock);

	if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
		dprintk("audio users: %d\n", dev->adev->users);
		dprintk("disabling audio stream!\n");
		dev->adev->shutdown = 0;
		dprintk("released lock\n");
		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
	}
	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 (dev->adev->capture_stream == STREAM_ON)
		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);

	return 0;
}

static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
{
	return 0;
}

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

	dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
				       "start": "stop");
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
		return 0;
	case SNDRV_PCM_TRIGGER_STOP:
		dev->adev->shutdown = 1;
		return 0;
	default:
		return -EINVAL;
	}
}

static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
						    *substream)
{
	struct em28xx *dev;

	snd_pcm_uframes_t hwptr_done;
	dev = snd_pcm_substream_chip(substream);
	hwptr_done = dev->adev->hwptr_done_capture;

	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;
	struct snd_pcm      *pcm;
	struct snd_card     *card;
	static int          devnr;
	int                 ret, err;

	if (dev->has_audio_class) {
		/* This device does not support the extension (in this case
		   the device is expecting the snd-usb-audio module */
		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");

	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
	if (!adev) {
		printk(KERN_ERR "em28xx-audio.c: out of memory\n");
		return -1;
	}
	card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
	if (card == NULL) {
		kfree(adev);
		return -ENOMEM;
	}

	spin_lock_init(&adev->slock);
	ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
	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");
	strcpy(card->driver, "Empia Em28xx Audio");
	strcpy(card->shortname, "Em28xx Audio");
	strcpy(card->longname, "Empia Em28xx Audio");

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

	return 0;
}

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

	if (dev->has_audio_class) {
		/* This device does not support the extension (in this case
		   the device is expecting the snd-usb-audio module */
		return 0;
	}

	if (dev->adev) {
		snd_card_free(dev->adev->sndcard);
		kfree(dev->adev);
		dev->adev = 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
6d79468d	59	static int em28xx_isoc_audio_deinit(struct em28xx *dev)
a52932b4	60	{
6d79468d	61	int i;
a52932b4	62
6d79468d MCC	63	dprintk("Stopping isoc\n");
	64	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
	65	usb_kill_urb(dev->adev->urb[i]);
	66	usb_free_urb(dev->adev->urb[i]);
	67	dev->adev->urb[i] = NULL;
a52932b4	68	}
a52932b4	69
a52932b4 MR	70	return 0;
	71	}
	72
a52932b4 MR	73	static void em28xx_audio_isocirq(struct urb *urb)
a52932b4 MR	74	{
6d79468d MCC	75	struct em28xx *dev = urb->context;
	76	int i;
	77	unsigned int oldptr;
	78	unsigned long flags;
	79	int period_elapsed = 0;
	80	int status;
	81	unsigned char *cp;
	82	unsigned int stride;
a52932b4	83	struct snd_pcm_substream *substream;
6d79468d	84	struct snd_pcm_runtime *runtime;
1a6f11e0 MCC	85	if (dev->adev->capture_pcm_substream) {
	86	substream = dev->adev->capture_pcm_substream;
	87	runtime = substream->runtime;
a52932b4	88	stride = runtime->frame_bits >> 3;
6d79468d	89
1a6f11e0 MCC	90	for (i = 0; i < urb->number_of_packets; i++) {
	91	int length =
	92	urb->iso_frame_desc[i].actual_length / stride;
	93	cp = (unsigned char *)urb->transfer_buffer +
	94	urb->iso_frame_desc[i].offset;
a52932b4	95
1a6f11e0	96	if (!length)
a52932b4 MR	97	continue;
	98
	99	spin_lock_irqsave(&dev->adev->slock, flags);
6d79468d	100
a52932b4	101	oldptr = dev->adev->hwptr_done_capture;
1a6f11e0 MCC	102	dev->adev->hwptr_done_capture += length;
	103	if (dev->adev->hwptr_done_capture >=
	104	runtime->buffer_size)
	105	dev->adev->hwptr_done_capture -=
	106	runtime->buffer_size;
a52932b4 MR	107
a52932b4 MR	108	dev->adev->capture_transfer_done += length;
1a6f11e0 MCC	109	if (dev->adev->capture_transfer_done >=
	110	runtime->period_size) {
	111	dev->adev->capture_transfer_done -=
	112	runtime->period_size;
	113	period_elapsed = 1;
a52932b4	114	}
6d79468d	115
a52932b4 MR	116	spin_unlock_irqrestore(&dev->adev->slock, flags);
a52932b4 MR	117
1a6f11e0 MCC	118	if (oldptr + length >= runtime->buffer_size) {
	119	unsigned int cnt =
	120	runtime->buffer_size - oldptr - 1;
	121	memcpy(runtime->dma_area + oldptr * stride, cp,
	122	cnt * stride);
	123	memcpy(runtime->dma_area, cp + cnt,
	124	length * stride - cnt * stride);
a52932b4	125	} else {
1a6f11e0 MCC	126	memcpy(runtime->dma_area + oldptr * stride, cp,
1a6f11e0 MCC	127	length * stride);
a52932b4 MR	128	}
a52932b4 MR	129	}
6d79468d	130	if (period_elapsed)
a52932b4	131	snd_pcm_period_elapsed(substream);
a52932b4 MR	132	}
a52932b4 MR	133	urb->status = 0;
1a6f11e0 MCC	134
1a6f11e0 MCC	135	if (dev->adev->shutdown)
a52932b4 MR	136	return;
a52932b4 MR	137
6d79468d MCC	138	status = usb_submit_urb(urb, GFP_ATOMIC);
6d79468d MCC	139	if (status < 0) {
1a6f11e0 MCC	140	em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
1a6f11e0 MCC	141	status);
a52932b4 MR	142	}
	143	return;
	144	}
	145
a52932b4 MR	146	static int em28xx_init_audio_isoc(struct em28xx *dev)
a52932b4 MR	147	{
6d79468d MCC	148	int i, errCode;
	149	const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
	150	EM28XX_AUDIO_MAX_PACKET_SIZE;
	151
	152	dprintk("Starting isoc transfers\n");
a52932b4	153
1a6f11e0	154	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
a52932b4	155	struct urb *urb;
1a6f11e0	156	int j, k;
6d79468d	157
1a6f11e0	158	dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
6d79468d	159	if (!dev->adev->transfer_buffer[i])
a52932b4	160	return -ENOMEM;
6d79468d	161
1a6f11e0 MCC	162	memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
1a6f11e0 MCC	163	urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
6d79468d	164	if (!urb)
a52932b4	165	return -ENOMEM;
6d79468d MCC	166
	167	urb->dev = dev->udev;
	168	urb->context = dev;
	169	urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
	170	urb->transfer_flags = URB_ISO_ASAP;
	171	urb->transfer_buffer = dev->adev->transfer_buffer[i];
	172	urb->interval = 1;
	173	urb->complete = em28xx_audio_isocirq;
	174	urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
	175	urb->transfer_buffer_length = sb_size;
	176
	177	for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
	178	j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
	179	urb->iso_frame_desc[j].offset = k;
	180	urb->iso_frame_desc[j].length =
	181	EM28XX_AUDIO_MAX_PACKET_SIZE;
a52932b4	182	}
6d79468d	183	dev->adev->urb[i] = urb;
a52932b4	184	}
6d79468d	185
1a6f11e0	186	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
a52932b4	187	errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
1a6f11e0	188	if (errCode) {
a52932b4	189	em28xx_isoc_audio_deinit(dev);
6d79468d	190
a52932b4 MR	191	return errCode;
	192	}
	193	}
6d79468d	194
a52932b4 MR	195	return 0;
	196	}
	197
1a6f11e0	198	static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
a52932b4	199	{
6d79468d MCC	200	dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
	201	"stop" : "start");
	202
1a6f11e0 MCC	203	switch (cmd) {
	204	case EM28XX_CAPTURE_STREAM_EN:
	205	if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
	206	dev->adev->capture_stream = STREAM_ON;
	207	em28xx_init_audio_isoc(dev);
	208	} else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
	209	dev->adev->capture_stream = STREAM_OFF;
	210	em28xx_isoc_audio_deinit(dev);
	211	} else {
6d79468d MCC	212	printk(KERN_ERR "An underrun very likely occurred. "
6d79468d MCC	213	"Ignoring it.\n");
1a6f11e0 MCC	214	}
	215	return 0;
	216	default:
	217	return -EINVAL;
a52932b4 MR	218	}
	219	}
	220
6d79468d MCC	221	static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
	222	size_t size)
	223	{
	224	struct snd_pcm_runtime *runtime = subs->runtime;
	225
	226	dprintk("Alocating vbuffer\n");
	227	if (runtime->dma_area) {
	228	if (runtime->dma_bytes > size)
	229	return 0;
	230
	231	vfree(runtime->dma_area);
	232	}
	233	runtime->dma_area = vmalloc(size);
	234	if (!runtime->dma_area)
	235	return -ENOMEM;
	236
	237	runtime->dma_bytes = size;
	238
	239	return 0;
	240	}
	241
	242	static struct snd_pcm_hardware snd_em28xx_hw_capture = {
	243	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	244	SNDRV_PCM_INFO_MMAP \|
	245	SNDRV_PCM_INFO_INTERLEAVED \|
	246	SNDRV_PCM_INFO_MMAP_VALID,
	247
	248	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	249
	250	.rates = SNDRV_PCM_RATE_CONTINUOUS \| SNDRV_PCM_RATE_KNOT,
	251
	252	.rate_min = 48000,
	253	.rate_max = 48000,
	254	.channels_min = 2,
	255	.channels_max = 2,
	256	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
	257	.period_bytes_min = 64, /* 12544/2, */
	258	.period_bytes_max = 12544,
	259	.periods_min = 2,
	260	.periods_max = 98, /* 12544, */
	261	};
	262
	263	static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
	264	{
	265	struct em28xx *dev = snd_pcm_substream_chip(substream);
	266	struct snd_pcm_runtime *runtime = substream->runtime;
	267	int ret = 0;
	268
	269	dprintk("opening device and trying to acquire exclusive lock\n");
	270
83ee87a3 MCC	271	if (!dev) {
	272	printk(KERN_ERR "BUG: em28xx can't find device struct."
	273	" Can't proceed with open\n");
	274	return -ENODEV;
	275	}
	276
6d79468d	277	/* Sets volume, mute, etc */
92ea42f4	278
6d79468d	279	dev->mute = 0;
92ea42f4	280	mutex_lock(&dev->lock);
6d79468d	281	ret = em28xx_audio_analog_set(dev);
92ea42f4	282	mutex_unlock(&dev->lock);
6d79468d MCC	283	if (ret < 0)
	284	goto err;
	285
	286	runtime->hw = snd_em28xx_hw_capture;
	287	if (dev->alt == 0 && dev->adev->users == 0) {
	288	int errCode;
	289	dev->alt = 7;
	290	errCode = usb_set_interface(dev->udev, 0, 7);
	291	dprintk("changing alternate number to 7\n");
	292	}
	293
	294	dev->adev->users++;
	295
	296	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	297	dev->adev->capture_pcm_substream = substream;
	298	runtime->private_data = dev;
	299
	300	return 0;
	301	err:
	302	printk(KERN_ERR "Error while configuring em28xx mixer\n");
	303	return ret;
	304	}
	305
	306	static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
	307	{
	308	struct em28xx *dev = snd_pcm_substream_chip(substream);
	309	dev->adev->users--;
	310
	311	dprintk("closing device\n");
	312
	313	dev->mute = 1;
92ea42f4	314	mutex_lock(&dev->lock);
6d79468d	315	em28xx_audio_analog_set(dev);
92ea42f4	316	mutex_unlock(&dev->lock);
6d79468d MCC	317
	318	if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
	319	dprintk("audio users: %d\n", dev->adev->users);
	320	dprintk("disabling audio stream!\n");
	321	dev->adev->shutdown = 0;
	322	dprintk("released lock\n");
	323	em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
	324	}
	325	return 0;
	326	}
	327
	328	static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
	329	struct snd_pcm_hw_params *hw_params)
	330	{
	331	unsigned int channels, rate, format;
	332	int ret;
	333
	334	dprintk("Setting capture parameters\n");
	335
	336	ret = snd_pcm_alloc_vmalloc_buffer(substream,
	337	params_buffer_bytes(hw_params));
	338	format = params_format(hw_params);
	339	rate = params_rate(hw_params);
	340	channels = params_channels(hw_params);
	341
	342	/* TODO: set up em28xx audio chip to deliver the correct audio format,
	343	current default is 48000hz multiplexed => 96000hz mono
	344	which shouldn't matter since analogue TV only supports mono */
	345	return 0;
	346	}
	347
	348	static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
	349	{
	350	struct em28xx *dev = snd_pcm_substream_chip(substream);
	351
	352	dprintk("Stop capture, if needed\n");
	353
	354	if (dev->adev->capture_stream == STREAM_ON)
	355	em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
	356
	357	return 0;
	358	}
	359
	360	static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
	361	{
	362	return 0;
	363	}
	364
	365	static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
	366	int cmd)
	367	{
	368	struct em28xx *dev = snd_pcm_substream_chip(substream);
	369
	370	dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
	371	"start": "stop");
	372	switch (cmd) {
	373	case SNDRV_PCM_TRIGGER_START:
	374	em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
	375	return 0;
	376	case SNDRV_PCM_TRIGGER_STOP:
	377	dev->adev->shutdown = 1;
	378	return 0;
	379	default:
	380	return -EINVAL;
381	}
382	}
383
1a6f11e0 MCC	384	static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
1a6f11e0 MCC	385	*substream)
a52932b4 MR	386	{
a52932b4 MR	387	struct em28xx *dev;
6d79468d	388
a52932b4 MR	389	snd_pcm_uframes_t hwptr_done;
	390	dev = snd_pcm_substream_chip(substream);
	391	hwptr_done = dev->adev->hwptr_done_capture;
6d79468d	392
a52932b4 MR	393	return hwptr_done;
	394	}
	395
	396	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
	397	unsigned long offset)
	398	{
	399	void *pageptr = subs->runtime->dma_area + offset;
6d79468d	400
a52932b4 MR	401	return vmalloc_to_page(pageptr);
	402	}
	403
	404	static struct snd_pcm_ops snd_em28xx_pcm_capture = {
6d79468d MCC	405	.open = snd_em28xx_capture_open,
	406	.close = snd_em28xx_pcm_close,
	407	.ioctl = snd_pcm_lib_ioctl,
a52932b4	408	.hw_params = snd_em28xx_hw_capture_params,
6d79468d MCC	409	.hw_free = snd_em28xx_hw_capture_free,
	410	.prepare = snd_em28xx_prepare,
	411	.trigger = snd_em28xx_capture_trigger,
	412	.pointer = snd_em28xx_capture_pointer,
	413	.page = snd_pcm_get_vmalloc_page,
a52932b4 MR	414	};
a52932b4 MR	415
a52932b4 MR	416	static int em28xx_audio_init(struct em28xx *dev)
	417	{
	418	struct em28xx_audio *adev;
6d79468d MCC	419	struct snd_pcm *pcm;
	420	struct snd_card *card;
	421	static int devnr;
	422	int ret, err;
	423
df619181 DH	424	if (dev->has_audio_class) {
	425	/* This device does not support the extension (in this case
	426	the device is expecting the snd-usb-audio module */
	427	return 0;
	428	}
	429
6d79468d MCC	430	printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
	431	"non standard usbaudio\n");
	432	printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
	433	"Rechberger\n");
	434
1a6f11e0 MCC	435	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
1a6f11e0 MCC	436	if (!adev) {
6d79468d	437	printk(KERN_ERR "em28xx-audio.c: out of memory\n");
a52932b4 MR	438	return -1;
a52932b4 MR	439	}
1a6f11e0 MCC	440	card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
1a6f11e0 MCC	441	if (card == NULL) {
a52932b4 MR	442	kfree(adev);
	443	return -ENOMEM;
	444	}
	445
	446	spin_lock_init(&adev->slock);
1a6f11e0	447	ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
a52932b4 MR	448	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
	449	pcm->info_flags = 0;
	450	pcm->private_data = dev;
1a6f11e0	451	strcpy(pcm->name, "Empia 28xx Capture");
a52932b4 MR	452	strcpy(card->driver, "Empia Em28xx Audio");
a52932b4 MR	453	strcpy(card->shortname, "Em28xx Audio");
1a6f11e0	454	strcpy(card->longname, "Empia Em28xx Audio");
a52932b4	455
6d79468d MCC	456	err = snd_card_register(card);
6d79468d MCC	457	if (err < 0) {
a52932b4 MR	458	snd_card_free(card);
	459	return -ENOMEM;
	460	}
1a6f11e0 MCC	461	adev->sndcard = card;
	462	adev->udev = dev->udev;
	463	dev->adev = adev;
6d79468d	464
a52932b4 MR	465	return 0;
	466	}
	467
	468	static int em28xx_audio_fini(struct em28xx *dev)
	469	{
1a6f11e0	470	if (dev == NULL)
a52932b4	471	return 0;
6d79468d	472
df619181 DH	473	if (dev->has_audio_class) {
	474	/* This device does not support the extension (in this case
	475	the device is expecting the snd-usb-audio module */
	476	return 0;
	477	}
	478
1a6f11e0	479	if (dev->adev) {
a52932b4 MR	480	snd_card_free(dev->adev->sndcard);
a52932b4 MR	481	kfree(dev->adev);
1a6f11e0	482	dev->adev = NULL;
a52932b4	483	}
6d79468d	484
a52932b4 MR	485	return 0;
	486	}
	487
	488	static struct em28xx_ops audio_ops = {
6d79468d	489	.id = EM28XX_AUDIO,
1a6f11e0 MCC	490	.name = "Em28xx Audio Extension",
	491	.init = em28xx_audio_init,
	492	.fini = em28xx_audio_fini,
a52932b4 MR	493	};
	494
	495	static int __init em28xx_alsa_register(void)
	496	{
a52932b4 MR	497	return em28xx_register_extension(&audio_ops);
	498	}
	499
	500	static void __exit em28xx_alsa_unregister(void)
	501	{
	502	em28xx_unregister_extension(&audio_ops);
	503	}
	504
	505	MODULE_LICENSE("GPL");
	506	MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
6d79468d	507	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
a52932b4 MR	508	MODULE_DESCRIPTION("Em28xx Audio driver");
	509
	510	module_init(em28xx_alsa_register);
	511	module_exit(em28xx_alsa_unregister);