[deliverable/linux.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_unlink_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;
	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;

			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;

	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) {
			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_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");
6d79468d MCC	64	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
faa3bd2e	65	usb_unlink_urb(dev->adev->urb[i]);
6d79468d MCC	66	usb_free_urb(dev->adev->urb[i]);
6d79468d MCC	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;
6d79468d MCC	78	int period_elapsed = 0;
	79	int status;
	80	unsigned char *cp;
	81	unsigned int stride;
a52932b4	82	struct snd_pcm_substream *substream;
6d79468d	83	struct snd_pcm_runtime *runtime;
1a6f11e0 MCC	84	if (dev->adev->capture_pcm_substream) {
	85	substream = dev->adev->capture_pcm_substream;
	86	runtime = substream->runtime;
a52932b4	87	stride = runtime->frame_bits >> 3;
6d79468d	88
1a6f11e0 MCC	89	for (i = 0; i < urb->number_of_packets; i++) {
	90	int length =
	91	urb->iso_frame_desc[i].actual_length / stride;
	92	cp = (unsigned char *)urb->transfer_buffer +
	93	urb->iso_frame_desc[i].offset;
a52932b4	94
1a6f11e0	95	if (!length)
a52932b4 MR	96	continue;
a52932b4 MR	97
a52932b4	98	oldptr = dev->adev->hwptr_done_capture;
50f3beb5 MCC	99	if (oldptr + length >= runtime->buffer_size) {
	100	unsigned int cnt =
	101	runtime->buffer_size - oldptr;
	102	memcpy(runtime->dma_area + oldptr * stride, cp,
	103	cnt * stride);
	104	memcpy(runtime->dma_area, cp + cnt * stride,
	105	length * stride - cnt * stride);
	106	} else {
	107	memcpy(runtime->dma_area + oldptr * stride, cp,
	108	length * stride);
	109	}
	110
50f3beb5	111	snd_pcm_stream_lock(substream);
50f3beb5	112
1a6f11e0 MCC	113	dev->adev->hwptr_done_capture += length;
	114	if (dev->adev->hwptr_done_capture >=
	115	runtime->buffer_size)
	116	dev->adev->hwptr_done_capture -=
	117	runtime->buffer_size;
a52932b4 MR	118
a52932b4 MR	119	dev->adev->capture_transfer_done += length;
1a6f11e0 MCC	120	if (dev->adev->capture_transfer_done >=
	121	runtime->period_size) {
	122	dev->adev->capture_transfer_done -=
	123	runtime->period_size;
	124	period_elapsed = 1;
a52932b4	125	}
6d79468d	126
50f3beb5	127	snd_pcm_stream_unlock(substream);
a52932b4	128	}
6d79468d	129	if (period_elapsed)
a52932b4	130	snd_pcm_period_elapsed(substream);
a52932b4 MR	131	}
a52932b4 MR	132	urb->status = 0;
1a6f11e0 MCC	133
1a6f11e0 MCC	134	if (dev->adev->shutdown)
a52932b4 MR	135	return;
a52932b4 MR	136
6d79468d MCC	137	status = usb_submit_urb(urb, GFP_ATOMIC);
6d79468d MCC	138	if (status < 0) {
1a6f11e0 MCC	139	em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
1a6f11e0 MCC	140	status);
a52932b4 MR	141	}
	142	return;
	143	}
	144
a52932b4 MR	145	static int em28xx_init_audio_isoc(struct em28xx *dev)
a52932b4 MR	146	{
6d79468d MCC	147	int i, errCode;
	148	const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
	149	EM28XX_AUDIO_MAX_PACKET_SIZE;
	150
	151	dprintk("Starting isoc transfers\n");
a52932b4	152
1a6f11e0	153	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
a52932b4	154	struct urb *urb;
1a6f11e0	155	int j, k;
6d79468d	156
1a6f11e0	157	dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
6d79468d	158	if (!dev->adev->transfer_buffer[i])
a52932b4	159	return -ENOMEM;
6d79468d	160
1a6f11e0 MCC	161	memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
1a6f11e0 MCC	162	urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
ff9b3e43 DSL	163	if (!urb) {
	164	em28xx_errdev("usb_alloc_urb failed!\n");
	165	for (j = 0; j < i; j++) {
	166	usb_free_urb(dev->adev->urb[j]);
	167	kfree(dev->adev->transfer_buffer[j]);
	168	}
a52932b4	169	return -ENOMEM;
ff9b3e43	170	}
6d79468d MCC	171
	172	urb->dev = dev->udev;
	173	urb->context = dev;
	174	urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
	175	urb->transfer_flags = URB_ISO_ASAP;
	176	urb->transfer_buffer = dev->adev->transfer_buffer[i];
	177	urb->interval = 1;
	178	urb->complete = em28xx_audio_isocirq;
	179	urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
	180	urb->transfer_buffer_length = sb_size;
	181
	182	for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
	183	j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
	184	urb->iso_frame_desc[j].offset = k;
	185	urb->iso_frame_desc[j].length =
	186	EM28XX_AUDIO_MAX_PACKET_SIZE;
a52932b4	187	}
6d79468d	188	dev->adev->urb[i] = urb;
a52932b4	189	}
6d79468d	190
1a6f11e0	191	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
a52932b4	192	errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
1a6f11e0	193	if (errCode) {
a52932b4	194	em28xx_isoc_audio_deinit(dev);
6d79468d	195
a52932b4 MR	196	return errCode;
	197	}
	198	}
6d79468d	199
a52932b4 MR	200	return 0;
	201	}
	202
1a6f11e0	203	static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
a52932b4	204	{
6d79468d MCC	205	dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
	206	"stop" : "start");
	207
1a6f11e0 MCC	208	switch (cmd) {
	209	case EM28XX_CAPTURE_STREAM_EN:
	210	if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
	211	dev->adev->capture_stream = STREAM_ON;
	212	em28xx_init_audio_isoc(dev);
	213	} else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
	214	dev->adev->capture_stream = STREAM_OFF;
	215	em28xx_isoc_audio_deinit(dev);
	216	} else {
6d79468d MCC	217	printk(KERN_ERR "An underrun very likely occurred. "
6d79468d MCC	218	"Ignoring it.\n");
1a6f11e0 MCC	219	}
	220	return 0;
	221	default:
	222	return -EINVAL;
a52932b4 MR	223	}
	224	}
	225
6d79468d MCC	226	static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
	227	size_t size)
	228	{
	229	struct snd_pcm_runtime *runtime = subs->runtime;
	230
	231	dprintk("Alocating vbuffer\n");
	232	if (runtime->dma_area) {
	233	if (runtime->dma_bytes > size)
	234	return 0;
	235
	236	vfree(runtime->dma_area);
	237	}
	238	runtime->dma_area = vmalloc(size);
	239	if (!runtime->dma_area)
	240	return -ENOMEM;
	241
	242	runtime->dma_bytes = size;
	243
	244	return 0;
	245	}
	246
	247	static struct snd_pcm_hardware snd_em28xx_hw_capture = {
	248	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	249	SNDRV_PCM_INFO_MMAP \|
	250	SNDRV_PCM_INFO_INTERLEAVED \|
	251	SNDRV_PCM_INFO_MMAP_VALID,
	252
	253	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	254
	255	.rates = SNDRV_PCM_RATE_CONTINUOUS \| SNDRV_PCM_RATE_KNOT,
	256
	257	.rate_min = 48000,
	258	.rate_max = 48000,
	259	.channels_min = 2,
	260	.channels_max = 2,
	261	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
	262	.period_bytes_min = 64, /* 12544/2, */
	263	.period_bytes_max = 12544,
	264	.periods_min = 2,
	265	.periods_max = 98, /* 12544, */
	266	};
	267
	268	static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
	269	{
	270	struct em28xx *dev = snd_pcm_substream_chip(substream);
	271	struct snd_pcm_runtime *runtime = substream->runtime;
	272	int ret = 0;
	273
	274	dprintk("opening device and trying to acquire exclusive lock\n");
	275
83ee87a3 MCC	276	if (!dev) {
	277	printk(KERN_ERR "BUG: em28xx can't find device struct."
	278	" Can't proceed with open\n");
	279	return -ENODEV;
	280	}
	281
6d79468d	282	/* Sets volume, mute, etc */
92ea42f4	283
6d79468d	284	dev->mute = 0;
92ea42f4	285	mutex_lock(&dev->lock);
6d79468d	286	ret = em28xx_audio_analog_set(dev);
92ea42f4	287	mutex_unlock(&dev->lock);
6d79468d MCC	288	if (ret < 0)
	289	goto err;
	290
	291	runtime->hw = snd_em28xx_hw_capture;
	292	if (dev->alt == 0 && dev->adev->users == 0) {
	293	int errCode;
	294	dev->alt = 7;
	295	errCode = usb_set_interface(dev->udev, 0, 7);
	296	dprintk("changing alternate number to 7\n");
	297	}
	298
	299	dev->adev->users++;
	300
	301	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	302	dev->adev->capture_pcm_substream = substream;
	303	runtime->private_data = dev;
	304
	305	return 0;
	306	err:
	307	printk(KERN_ERR "Error while configuring em28xx mixer\n");
	308	return ret;
	309	}
	310
	311	static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
	312	{
	313	struct em28xx *dev = snd_pcm_substream_chip(substream);
	314	dev->adev->users--;
	315
	316	dprintk("closing device\n");
	317
	318	dev->mute = 1;
92ea42f4	319	mutex_lock(&dev->lock);
6d79468d	320	em28xx_audio_analog_set(dev);
92ea42f4	321	mutex_unlock(&dev->lock);
6d79468d MCC	322
	323	if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
	324	dprintk("audio users: %d\n", dev->adev->users);
	325	dprintk("disabling audio stream!\n");
	326	dev->adev->shutdown = 0;
	327	dprintk("released lock\n");
	328	em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
	329	}
	330	return 0;
	331	}
	332
	333	static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
	334	struct snd_pcm_hw_params *hw_params)
	335	{
	336	unsigned int channels, rate, format;
	337	int ret;
	338
	339	dprintk("Setting capture parameters\n");
	340
	341	ret = snd_pcm_alloc_vmalloc_buffer(substream,
	342	params_buffer_bytes(hw_params));
	343	format = params_format(hw_params);
	344	rate = params_rate(hw_params);
	345	channels = params_channels(hw_params);
	346
	347	/* TODO: set up em28xx audio chip to deliver the correct audio format,
	348	current default is 48000hz multiplexed => 96000hz mono
	349	which shouldn't matter since analogue TV only supports mono */
	350	return 0;
	351	}
	352
	353	static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
	354	{
	355	struct em28xx *dev = snd_pcm_substream_chip(substream);
	356
	357	dprintk("Stop capture, if needed\n");
	358
	359	if (dev->adev->capture_stream == STREAM_ON)
	360	em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
	361
	362	return 0;
	363	}
	364
	365	static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
	366	{
	367	return 0;
	368	}
	369
	370	static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
	371	int cmd)
	372	{
	373	struct em28xx *dev = snd_pcm_substream_chip(substream);
	374
	375	dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
	376	"start": "stop");
	377	switch (cmd) {
	378	case SNDRV_PCM_TRIGGER_START:
	379	em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
	380	return 0;
	381	case SNDRV_PCM_TRIGGER_STOP:
	382	dev->adev->shutdown = 1;
	383	return 0;
	384	default:
	385	return -EINVAL;
386	}
387	}
388
1a6f11e0 MCC	389	static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
1a6f11e0 MCC	390	*substream)
a52932b4 MR	391	{
a52932b4 MR	392	struct em28xx *dev;
6d79468d	393
a52932b4 MR	394	snd_pcm_uframes_t hwptr_done;
	395	dev = snd_pcm_substream_chip(substream);
	396	hwptr_done = dev->adev->hwptr_done_capture;
6d79468d	397
a52932b4 MR	398	return hwptr_done;
	399	}
	400
	401	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
	402	unsigned long offset)
	403	{
	404	void *pageptr = subs->runtime->dma_area + offset;
6d79468d	405
a52932b4 MR	406	return vmalloc_to_page(pageptr);
	407	}
	408
	409	static struct snd_pcm_ops snd_em28xx_pcm_capture = {
6d79468d MCC	410	.open = snd_em28xx_capture_open,
	411	.close = snd_em28xx_pcm_close,
	412	.ioctl = snd_pcm_lib_ioctl,
a52932b4	413	.hw_params = snd_em28xx_hw_capture_params,
6d79468d MCC	414	.hw_free = snd_em28xx_hw_capture_free,
	415	.prepare = snd_em28xx_prepare,
	416	.trigger = snd_em28xx_capture_trigger,
	417	.pointer = snd_em28xx_capture_pointer,
	418	.page = snd_pcm_get_vmalloc_page,
a52932b4 MR	419	};
a52932b4 MR	420
a52932b4 MR	421	static int em28xx_audio_init(struct em28xx *dev)
	422	{
	423	struct em28xx_audio *adev;
6d79468d MCC	424	struct snd_pcm *pcm;
	425	struct snd_card *card;
	426	static int devnr;
	427	int ret, err;
	428
df619181 DH	429	if (dev->has_audio_class) {
	430	/* This device does not support the extension (in this case
	431	the device is expecting the snd-usb-audio module */
	432	return 0;
	433	}
	434
6d79468d MCC	435	printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
	436	"non standard usbaudio\n");
	437	printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
	438	"Rechberger\n");
	439
1a6f11e0 MCC	440	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
1a6f11e0 MCC	441	if (!adev) {
6d79468d	442	printk(KERN_ERR "em28xx-audio.c: out of memory\n");
a52932b4 MR	443	return -1;
a52932b4 MR	444	}
1a6f11e0 MCC	445	card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
1a6f11e0 MCC	446	if (card == NULL) {
a52932b4 MR	447	kfree(adev);
	448	return -ENOMEM;
	449	}
	450
	451	spin_lock_init(&adev->slock);
1a6f11e0	452	ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
a52932b4 MR	453	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
	454	pcm->info_flags = 0;
	455	pcm->private_data = dev;
1a6f11e0	456	strcpy(pcm->name, "Empia 28xx Capture");
a52932b4 MR	457	strcpy(card->driver, "Empia Em28xx Audio");
a52932b4 MR	458	strcpy(card->shortname, "Em28xx Audio");
1a6f11e0	459	strcpy(card->longname, "Empia Em28xx Audio");
a52932b4	460
6d79468d MCC	461	err = snd_card_register(card);
6d79468d MCC	462	if (err < 0) {
a52932b4 MR	463	snd_card_free(card);
	464	return -ENOMEM;
	465	}
1a6f11e0 MCC	466	adev->sndcard = card;
	467	adev->udev = dev->udev;
	468	dev->adev = adev;
6d79468d	469
a52932b4 MR	470	return 0;
	471	}
	472
	473	static int em28xx_audio_fini(struct em28xx *dev)
	474	{
1a6f11e0	475	if (dev == NULL)
a52932b4	476	return 0;
6d79468d	477
df619181 DH	478	if (dev->has_audio_class) {
	479	/* This device does not support the extension (in this case
	480	the device is expecting the snd-usb-audio module */
	481	return 0;
	482	}
	483
1a6f11e0	484	if (dev->adev) {
a52932b4 MR	485	snd_card_free(dev->adev->sndcard);
a52932b4 MR	486	kfree(dev->adev);
1a6f11e0	487	dev->adev = NULL;
a52932b4	488	}
6d79468d	489
a52932b4 MR	490	return 0;
	491	}
	492
	493	static struct em28xx_ops audio_ops = {
6d79468d	494	.id = EM28XX_AUDIO,
1a6f11e0 MCC	495	.name = "Em28xx Audio Extension",
	496	.init = em28xx_audio_init,
	497	.fini = em28xx_audio_fini,
a52932b4 MR	498	};
	499
	500	static int __init em28xx_alsa_register(void)
	501	{
a52932b4 MR	502	return em28xx_register_extension(&audio_ops);
	503	}
	504
	505	static void __exit em28xx_alsa_unregister(void)
	506	{
	507	em28xx_unregister_extension(&audio_ops);
	508	}
	509
	510	MODULE_LICENSE("GPL");
	511	MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
6d79468d	512	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
a52932b4 MR	513	MODULE_DESCRIPTION("Em28xx Audio driver");
	514
	515	module_init(em28xx_alsa_register);
	516	module_exit(em28xx_alsa_unregister);