[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_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 (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 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 == EM28XX_START_AUDIO) {
			dev->adev.capture_stream = STREAM_ON;
			em28xx_init_audio_isoc(dev);
		} else if (dev->adev.capture_stream == STREAM_ON && arg == EM28XX_STOP_AUDIO) {
			dev->adev.capture_stream = STREAM_OFF;
			em28xx_deinit_isoc_audio(dev);
		} else {
			em28xx_errdev("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("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) {
		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");
	}

	mutex_lock(&dev->lock);
	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:
	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);

	dprintk("closing device\n");

	dev->mute = 1;
	mutex_lock(&dev->lock);
	dev->adev.users--;
	em28xx_audio_analog_set(dev);
	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 (dev->adev.capture_stream == STREAM_ON)
		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_STOP_AUDIO);

	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);
	int retval;

	dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
				       "start": "stop");

	spin_lock(&dev->adev.slock);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_START_AUDIO);
		retval = 0;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_STOP_AUDIO);
		retval = 0;
		break;
	default:
		retval = -EINVAL;
	}

	spin_unlock(&dev->adev.slock);
	return retval;
}

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, "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 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
9baed99e MCC	105	if (dev->adev.capture_pcm_substream) {
9baed99e MCC	106	substream = dev->adev.capture_pcm_substream;
1a6f11e0	107	runtime = substream->runtime;
a52932b4	108	stride = runtime->frame_bits >> 3;
6d79468d	109
1a6f11e0 MCC	110	for (i = 0; i < urb->number_of_packets; i++) {
	111	int length =
	112	urb->iso_frame_desc[i].actual_length / stride;
	113	cp = (unsigned char *)urb->transfer_buffer +
	114	urb->iso_frame_desc[i].offset;
a52932b4	115
1a6f11e0	116	if (!length)
a52932b4 MR	117	continue;
a52932b4 MR	118
9baed99e	119	oldptr = dev->adev.hwptr_done_capture;
50f3beb5 MCC	120	if (oldptr + length >= runtime->buffer_size) {
	121	unsigned int cnt =
	122	runtime->buffer_size - oldptr;
	123	memcpy(runtime->dma_area + oldptr * stride, cp,
	124	cnt * stride);
	125	memcpy(runtime->dma_area, cp + cnt * stride,
	126	length * stride - cnt * stride);
	127	} else {
	128	memcpy(runtime->dma_area + oldptr * stride, cp,
	129	length * stride);
	130	}
	131
50f3beb5	132	snd_pcm_stream_lock(substream);
50f3beb5	133
9baed99e MCC	134	dev->adev.hwptr_done_capture += length;
9baed99e MCC	135	if (dev->adev.hwptr_done_capture >=
1a6f11e0	136	runtime->buffer_size)
9baed99e	137	dev->adev.hwptr_done_capture -=
1a6f11e0	138	runtime->buffer_size;
a52932b4	139
9baed99e MCC	140	dev->adev.capture_transfer_done += length;
9baed99e MCC	141	if (dev->adev.capture_transfer_done >=
1a6f11e0	142	runtime->period_size) {
9baed99e	143	dev->adev.capture_transfer_done -=
1a6f11e0 MCC	144	runtime->period_size;
1a6f11e0 MCC	145	period_elapsed = 1;
a52932b4	146	}
6d79468d	147
50f3beb5	148	snd_pcm_stream_unlock(substream);
a52932b4	149	}
6d79468d	150	if (period_elapsed)
a52932b4	151	snd_pcm_period_elapsed(substream);
a52932b4 MR	152	}
a52932b4 MR	153	urb->status = 0;
1a6f11e0	154
6d79468d MCC	155	status = usb_submit_urb(urb, GFP_ATOMIC);
6d79468d MCC	156	if (status < 0) {
1a6f11e0 MCC	157	em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
1a6f11e0 MCC	158	status);
a52932b4 MR	159	}
	160	return;
	161	}
	162
a52932b4 MR	163	static int em28xx_init_audio_isoc(struct em28xx *dev)
a52932b4 MR	164	{
6d79468d MCC	165	int i, errCode;
	166	const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
	167	EM28XX_AUDIO_MAX_PACKET_SIZE;
	168
	169	dprintk("Starting isoc transfers\n");
a52932b4	170
1a6f11e0	171	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
a52932b4	172	struct urb *urb;
1a6f11e0	173	int j, k;
6d79468d	174
9baed99e MCC	175	dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
9baed99e MCC	176	if (!dev->adev.transfer_buffer[i])
a52932b4	177	return -ENOMEM;
6d79468d	178
9baed99e	179	memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
1a6f11e0	180	urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
ff9b3e43 DSL	181	if (!urb) {
	182	em28xx_errdev("usb_alloc_urb failed!\n");
	183	for (j = 0; j < i; j++) {
9baed99e MCC	184	usb_free_urb(dev->adev.urb[j]);
9baed99e MCC	185	kfree(dev->adev.transfer_buffer[j]);
ff9b3e43	186	}
a52932b4	187	return -ENOMEM;
ff9b3e43	188	}
6d79468d MCC	189
	190	urb->dev = dev->udev;
	191	urb->context = dev;
	192	urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
	193	urb->transfer_flags = URB_ISO_ASAP;
9baed99e	194	urb->transfer_buffer = dev->adev.transfer_buffer[i];
6d79468d MCC	195	urb->interval = 1;
	196	urb->complete = em28xx_audio_isocirq;
	197	urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
	198	urb->transfer_buffer_length = sb_size;
	199
	200	for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
	201	j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
	202	urb->iso_frame_desc[j].offset = k;
	203	urb->iso_frame_desc[j].length =
	204	EM28XX_AUDIO_MAX_PACKET_SIZE;
a52932b4	205	}
9baed99e	206	dev->adev.urb[i] = urb;
a52932b4	207	}
6d79468d	208
1a6f11e0	209	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
9baed99e	210	errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
1a6f11e0	211	if (errCode) {
aa5a1821	212	em28xx_deinit_isoc_audio(dev);
a52932b4 MR	213	return errCode;
	214	}
	215	}
6d79468d	216
a52932b4 MR	217	return 0;
	218	}
	219
1a6f11e0	220	static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
a52932b4	221	{
9baed99e	222	dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
6d79468d MCC	223	"stop" : "start");
6d79468d MCC	224
1a6f11e0 MCC	225	switch (cmd) {
1a6f11e0 MCC	226	case EM28XX_CAPTURE_STREAM_EN:
22cff7b3	227	if (dev->adev.capture_stream == STREAM_OFF && arg == EM28XX_START_AUDIO) {
9baed99e	228	dev->adev.capture_stream = STREAM_ON;
1a6f11e0	229	em28xx_init_audio_isoc(dev);
22cff7b3	230	} else if (dev->adev.capture_stream == STREAM_ON && arg == EM28XX_STOP_AUDIO) {
9baed99e	231	dev->adev.capture_stream = STREAM_OFF;
aa5a1821	232	em28xx_deinit_isoc_audio(dev);
1a6f11e0	233	} else {
5c030de4	234	em28xx_errdev("An underrun very likely occurred. "
6d79468d	235	"Ignoring it.\n");
1a6f11e0 MCC	236	}
	237	return 0;
	238	default:
	239	return -EINVAL;
a52932b4 MR	240	}
	241	}
	242
6d79468d MCC	243	static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
	244	size_t size)
	245	{
	246	struct snd_pcm_runtime *runtime = subs->runtime;
	247
a1a6ee74	248	dprintk("Allocating vbuffer\n");
6d79468d MCC	249	if (runtime->dma_area) {
	250	if (runtime->dma_bytes > size)
	251	return 0;
	252
	253	vfree(runtime->dma_area);
	254	}
	255	runtime->dma_area = vmalloc(size);
	256	if (!runtime->dma_area)
	257	return -ENOMEM;
	258
	259	runtime->dma_bytes = size;
	260
	261	return 0;
	262	}
	263
	264	static struct snd_pcm_hardware snd_em28xx_hw_capture = {
	265	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	266	SNDRV_PCM_INFO_MMAP \|
	267	SNDRV_PCM_INFO_INTERLEAVED \|
	268	SNDRV_PCM_INFO_MMAP_VALID,
	269
	270	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	271
	272	.rates = SNDRV_PCM_RATE_CONTINUOUS \| SNDRV_PCM_RATE_KNOT,
	273
	274	.rate_min = 48000,
	275	.rate_max = 48000,
	276	.channels_min = 2,
	277	.channels_max = 2,
	278	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
	279	.period_bytes_min = 64, /* 12544/2, */
	280	.period_bytes_max = 12544,
	281	.periods_min = 2,
	282	.periods_max = 98, /* 12544, */
	283	};
	284
	285	static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
	286	{
	287	struct em28xx *dev = snd_pcm_substream_chip(substream);
	288	struct snd_pcm_runtime *runtime = substream->runtime;
	289	int ret = 0;
	290
	291	dprintk("opening device and trying to acquire exclusive lock\n");
	292
83ee87a3 MCC	293	if (!dev) {
	294	printk(KERN_ERR "BUG: em28xx can't find device struct."
	295	" Can't proceed with open\n");
	296	return -ENODEV;
	297	}
	298
6d79468d	299	/* Sets volume, mute, etc */
92ea42f4	300
6d79468d	301	dev->mute = 0;
92ea42f4	302	mutex_lock(&dev->lock);
6d79468d	303	ret = em28xx_audio_analog_set(dev);
92ea42f4	304	mutex_unlock(&dev->lock);
6d79468d MCC	305	if (ret < 0)
	306	goto err;
	307
	308	runtime->hw = snd_em28xx_hw_capture;
9baed99e	309	if (dev->alt == 0 && dev->adev.users == 0) {
6d79468d MCC	310	int errCode;
	311	dev->alt = 7;
	312	errCode = usb_set_interface(dev->udev, 0, 7);
	313	dprintk("changing alternate number to 7\n");
	314	}
	315
bf510ac3	316	mutex_lock(&dev->lock);
9baed99e	317	dev->adev.users++;
bf510ac3	318	mutex_unlock(&dev->lock);
6d79468d MCC	319
6d79468d MCC	320	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
9baed99e	321	dev->adev.capture_pcm_substream = substream;
6d79468d MCC	322	runtime->private_data = dev;
	323
	324	return 0;
	325	err:
	326	printk(KERN_ERR "Error while configuring em28xx mixer\n");
	327	return ret;
	328	}
	329
	330	static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
	331	{
	332	struct em28xx *dev = snd_pcm_substream_chip(substream);
6d79468d MCC	333
	334	dprintk("closing device\n");
	335
	336	dev->mute = 1;
92ea42f4	337	mutex_lock(&dev->lock);
bf510ac3	338	dev->adev.users--;
6d79468d	339	em28xx_audio_analog_set(dev);
92ea42f4	340	mutex_unlock(&dev->lock);
6d79468d	341
6d79468d MCC	342	return 0;
	343	}
	344
	345	static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
	346	struct snd_pcm_hw_params *hw_params)
	347	{
	348	unsigned int channels, rate, format;
	349	int ret;
	350
	351	dprintk("Setting capture parameters\n");
	352
	353	ret = snd_pcm_alloc_vmalloc_buffer(substream,
	354	params_buffer_bytes(hw_params));
	355	format = params_format(hw_params);
	356	rate = params_rate(hw_params);
	357	channels = params_channels(hw_params);
	358
	359	/* TODO: set up em28xx audio chip to deliver the correct audio format,
	360	current default is 48000hz multiplexed => 96000hz mono
	361	which shouldn't matter since analogue TV only supports mono */
	362	return 0;
	363	}
	364
	365	static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
	366	{
	367	struct em28xx *dev = snd_pcm_substream_chip(substream);
	368
	369	dprintk("Stop capture, if needed\n");
	370
9baed99e	371	if (dev->adev.capture_stream == STREAM_ON)
22cff7b3	372	em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_STOP_AUDIO);
6d79468d MCC	373
	374	return 0;
	375	}
	376
	377	static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
	378	{
	379	return 0;
	380	}
	381
	382	static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
	383	int cmd)
	384	{
	385	struct em28xx *dev = snd_pcm_substream_chip(substream);
df39ca64	386	int retval;
6d79468d MCC	387
	388	dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
	389	"start": "stop");
df39ca64 DSL	390
df39ca64 DSL	391	spin_lock(&dev->adev.slock);
6d79468d MCC	392	switch (cmd) {
6d79468d MCC	393	case SNDRV_PCM_TRIGGER_START:
22cff7b3	394	em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_START_AUDIO);
df39ca64 DSL	395	retval = 0;
df39ca64 DSL	396	break;
6d79468d	397	case SNDRV_PCM_TRIGGER_STOP:
22cff7b3	398	em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_STOP_AUDIO);
df39ca64 DSL	399	retval = 0;
df39ca64 DSL	400	break;
6d79468d	401	default:
df39ca64	402	retval = -EINVAL;
6d79468d	403	}
df39ca64 DSL	404
	405	spin_unlock(&dev->adev.slock);
	406	return retval;
6d79468d MCC	407	}
6d79468d MCC	408
1a6f11e0 MCC	409	static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
1a6f11e0 MCC	410	*substream)
a52932b4	411	{
a1a6ee74	412	unsigned long flags;
53d12e5a	413	struct em28xx *dev;
a52932b4	414	snd_pcm_uframes_t hwptr_done;
53d12e5a	415
a52932b4	416	dev = snd_pcm_substream_chip(substream);
00bc0645	417	spin_lock_irqsave(&dev->adev.slock, flags);
9baed99e	418	hwptr_done = dev->adev.hwptr_done_capture;
00bc0645	419	spin_unlock_irqrestore(&dev->adev.slock, flags);
6d79468d	420
a52932b4 MR	421	return hwptr_done;
	422	}
	423
	424	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
	425	unsigned long offset)
	426	{
	427	void *pageptr = subs->runtime->dma_area + offset;
6d79468d	428
a52932b4 MR	429	return vmalloc_to_page(pageptr);
	430	}
	431
	432	static struct snd_pcm_ops snd_em28xx_pcm_capture = {
6d79468d MCC	433	.open = snd_em28xx_capture_open,
	434	.close = snd_em28xx_pcm_close,
	435	.ioctl = snd_pcm_lib_ioctl,
a52932b4	436	.hw_params = snd_em28xx_hw_capture_params,
6d79468d MCC	437	.hw_free = snd_em28xx_hw_capture_free,
	438	.prepare = snd_em28xx_prepare,
	439	.trigger = snd_em28xx_capture_trigger,
	440	.pointer = snd_em28xx_capture_pointer,
	441	.page = snd_pcm_get_vmalloc_page,
a52932b4 MR	442	};
a52932b4 MR	443
a52932b4 MR	444	static int em28xx_audio_init(struct em28xx *dev)
a52932b4 MR	445	{
9baed99e	446	struct em28xx_audio *adev = &dev->adev;
6d79468d MCC	447	struct snd_pcm *pcm;
	448	struct snd_card *card;
	449	static int devnr;
65c9fd46	450	int err;
6d79468d	451
24a613e4	452	if (dev->has_alsa_audio != 1) {
df619181	453	/* This device does not support the extension (in this case
24a613e4 DH	454	the device is expecting the snd-usb-audio module or
24a613e4 DH	455	doesn't have analog audio support at all) */
df619181 DH	456	return 0;
	457	}
	458
6d79468d MCC	459	printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
	460	"non standard usbaudio\n");
	461	printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
	462	"Rechberger\n");
	463
758021bf TI	464	err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
	465	&card);
	466	if (err < 0)
	467	return err;
a52932b4 MR	468
a52932b4 MR	469	spin_lock_init(&adev->slock);
1f6340bd MCC	470	err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
	471	if (err < 0) {
	472	snd_card_free(card);
	473	return err;
	474	}
	475
a52932b4 MR	476	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
	477	pcm->info_flags = 0;
	478	pcm->private_data = dev;
1a6f11e0	479	strcpy(pcm->name, "Empia 28xx Capture");
7662b00c NS	480
7662b00c NS	481	snd_card_set_dev(card, &dev->udev->dev);
a52932b4 MR	482	strcpy(card->driver, "Empia Em28xx Audio");
a52932b4 MR	483	strcpy(card->shortname, "Em28xx Audio");
1a6f11e0	484	strcpy(card->longname, "Empia Em28xx Audio");
a52932b4	485
6d79468d MCC	486	err = snd_card_register(card);
6d79468d MCC	487	if (err < 0) {
a52932b4	488	snd_card_free(card);
1f6340bd	489	return err;
a52932b4	490	}
1a6f11e0 MCC	491	adev->sndcard = card;
1a6f11e0 MCC	492	adev->udev = dev->udev;
6d79468d	493
a52932b4 MR	494	return 0;
	495	}
	496
	497	static int em28xx_audio_fini(struct em28xx *dev)
	498	{
1a6f11e0	499	if (dev == NULL)
a52932b4	500	return 0;
6d79468d	501
24a613e4	502	if (dev->has_alsa_audio != 1) {
df619181	503	/* This device does not support the extension (in this case
24a613e4 DH	504	the device is expecting the snd-usb-audio module or
24a613e4 DH	505	doesn't have analog audio support at all) */
df619181 DH	506	return 0;
	507	}
	508
9baed99e MCC	509	if (dev->adev.sndcard) {
	510	snd_card_free(dev->adev.sndcard);
	511	dev->adev.sndcard = NULL;
a52932b4	512	}
6d79468d	513
a52932b4 MR	514	return 0;
	515	}
	516
	517	static struct em28xx_ops audio_ops = {
6d79468d	518	.id = EM28XX_AUDIO,
1a6f11e0 MCC	519	.name = "Em28xx Audio Extension",
	520	.init = em28xx_audio_init,
	521	.fini = em28xx_audio_fini,
a52932b4 MR	522	};
	523
	524	static int __init em28xx_alsa_register(void)
	525	{
a52932b4 MR	526	return em28xx_register_extension(&audio_ops);
	527	}
	528
	529	static void __exit em28xx_alsa_unregister(void)
	530	{
	531	em28xx_unregister_extension(&audio_ops);
	532	}
	533
	534	MODULE_LICENSE("GPL");
	535	MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
6d79468d	536	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
a52932b4 MR	537	MODULE_DESCRIPTION("Em28xx Audio driver");
	538
	539	module_init(em28xx_alsa_register);
	540	module_exit(em28xx_alsa_unregister);