[deliverable/linux.git] / drivers / media / video / cx231xx / cx231xx-audio.c

/*
 *  Conexant Cx231xx audio extension
 *
 *  Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
 *       Based on em28xx driver
 *
 *
 *  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 "cx231xx.h"
#include "cx231xx-pcb-config.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 "cx231xx-audio %s: " fmt,		\
				  __func__, ##arg); 		\
	} while (0)

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;

static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
{
	int i;

	dprintk("Stopping isoc\n");

	for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
		if (dev->adev.urb[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 cx231xx_audio_isocirq(struct urb *urb)
{
	struct cx231xx *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;

				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) {
		cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
			       status);
	}
	return;
}

static int cx231xx_init_audio_isoc(struct cx231xx *dev)
{
	int i, errCode;
	int sb_size;

	cx231xx_info("%s: Starting AUDIO transfers\n", __func__);

	sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;

	for (i = 0; i < CX231XX_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(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
		if (!urb) {
			cx231xx_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, dev->adev.end_point_addr);
		urb->transfer_flags = URB_ISO_ASAP;
		urb->transfer_buffer = dev->adev.transfer_buffer[i];
		urb->interval = 1;
		urb->complete = cx231xx_audio_isocirq;
		urb->number_of_packets = CX231XX_NUM_AUDIO_PACKETS;
		urb->transfer_buffer_length = sb_size;

		for (j = k = 0; j < CX231XX_NUM_AUDIO_PACKETS; j++, k += dev->adev.max_pkt_size) {
			urb->iso_frame_desc[j].offset = k;
			urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
		}
		dev->adev.urb[i] = urb;
	}

	for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
		errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
		if (errCode < 0) {
			cx231xx_isoc_audio_deinit(dev);
			return errCode;
		}
	}

	return errCode;
}

static int cx231xx_cmd(struct cx231xx *dev, int cmd, int arg)
{
	dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
		"stop" : "start");

	switch (cmd) {
	case CX231XX_CAPTURE_STREAM_EN:
		if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
			dev->adev.capture_stream = STREAM_ON;
			cx231xx_init_audio_isoc(dev);
		} else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
			dev->adev.capture_stream = STREAM_OFF;
			cx231xx_isoc_audio_deinit(dev);
		} else {
			cx231xx_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_cx231xx_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_cx231xx_capture_open(struct snd_pcm_substream *substream)
{
	struct cx231xx *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) {
		cx231xx_errdev("BUG: cx231xx can't find device struct."
			       " Can't proceed with open\n");
		return -ENODEV;
	}

	/* Sets volume, mute, etc */
	dev->mute = 0;

	/* set alternate setting for audio interface */
	ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);	/* 1 - 48000 samples per sec */
	if (ret < 0) {
		cx231xx_errdev("failed to set alternate setting !\n");

		return ret;
	}

	/* inform hardware to start streaming */
	ret = cx231xx_capture_start(dev, 1, Audio);

	runtime->hw = snd_cx231xx_hw_capture;

	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;
}

static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
{
	int ret;
	struct cx231xx *dev = snd_pcm_substream_chip(substream);

	dprintk("closing device\n");

	/* set alternate setting for audio interface */
	ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);	/* 1 - 48000 samples per sec */
	if (ret < 0) {
		cx231xx_errdev("failed to set alternate setting !\n");

		return ret;
	}

	/* inform hardware to start streaming */
	ret = cx231xx_capture_start(dev, 0, Audio);

	dev->mute = 1;
	mutex_lock(&dev->lock);
	dev->adev.users--;
	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");
		cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, 0);
	}
	return 0;
}

static int snd_cx231xx_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 cx231xx 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_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
{
	struct cx231xx *dev = snd_pcm_substream_chip(substream);

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

	if (dev->adev.capture_stream == STREAM_ON)
		cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);

	return 0;
}

static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
{
	return 0;
}

static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
				       int cmd)
{
	struct cx231xx *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:
		cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN,
			    CX231XX_START_AUDIO);
		retval = 0;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
		retval = 0;
		break;
	default:
		retval = -EINVAL;
	}

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

static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
						     *substream)
{
	struct cx231xx *dev;
	unsigned long flags;
	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_cx231xx_pcm_capture = {
	.open = snd_cx231xx_capture_open,
	.close = snd_cx231xx_pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_cx231xx_hw_capture_params,
	.hw_free = snd_cx231xx_hw_capture_free,
	.prepare = snd_cx231xx_prepare,
	.trigger = snd_cx231xx_capture_trigger,
	.pointer = snd_cx231xx_capture_pointer,
	.page = snd_pcm_get_vmalloc_page,
};

static int cx231xx_audio_init(struct cx231xx *dev)
{
	struct cx231xx_audio *adev = &dev->adev;
	struct snd_pcm *pcm;
	struct snd_card *card;
	static int devnr;
	int err;
	struct usb_interface *uif;
	int i, isoc_pipe = 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;
	}

	cx231xx_info("cx231xx-audio.c: probing for cx231xx "
		     "non standard usbaudio\n");

	card = snd_card_new(index[devnr], "Cx231xx Audio", THIS_MODULE, 0);
	if (card == NULL)
		return -ENOMEM;

	spin_lock_init(&adev->slock);
	err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
	if (err < 0) {
		snd_card_free(card);
		return err;
	}

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
			&snd_cx231xx_pcm_capture);
	pcm->info_flags = 0;
	pcm->private_data = dev;
	strcpy(pcm->name, "Conexant cx231xx Capture");
	strcpy(card->driver, "Conexant cx231xx Audio");
	strcpy(card->shortname, "Cx231xx Audio");
	strcpy(card->longname, "Conexant cx231xx Audio");

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

	/* compute alternate max packet sizes for Audio */
	uif =
	    dev->udev->actconfig->interface[dev->current_pcb_config.
					    hs_config_info[0].interface_info.
					    audio_index + 1];

	adev->end_point_addr =
	    le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
			bEndpointAddress);

	adev->num_alt = uif->num_altsetting;
	cx231xx_info(": EndPoint Addr 0x%x, Alternate settings: %i\n",
		     adev->end_point_addr, adev->num_alt);
	adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);

	if (adev->alt_max_pkt_size == NULL) {
		cx231xx_errdev("out of memory!\n");
		return -ENOMEM;
	}

	for (i = 0; i < adev->num_alt; i++) {
		u16 tmp =
		    le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
				wMaxPacketSize);
		adev->alt_max_pkt_size[i] =
		    (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
		cx231xx_info("Alternate setting %i, max size= %i\n", i,
			     adev->alt_max_pkt_size[i]);
	}

	return 0;
}

static int cx231xx_audio_fini(struct cx231xx *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);
		kfree(dev->adev.alt_max_pkt_size);
		dev->adev.sndcard = NULL;
	}

	return 0;
}

static struct cx231xx_ops audio_ops = {
	.id = CX231XX_AUDIO,
	.name = "Cx231xx Audio Extension",
	.init = cx231xx_audio_init,
	.fini = cx231xx_audio_fini,
};

static int __init cx231xx_alsa_register(void)
{
	return cx231xx_register_extension(&audio_ops);
}

static void __exit cx231xx_alsa_unregister(void)
{
	cx231xx_unregister_extension(&audio_ops);
}

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
MODULE_DESCRIPTION("Cx231xx Audio driver");

module_init(cx231xx_alsa_register);
module_exit(cx231xx_alsa_unregister);
Commit	Line	Data
e0d3bafd SD	1	/*
	2	* Conexant Cx231xx audio extension
	3	*
	4	* Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
	5	* Based on em28xx driver
	6	*
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*/
	22
	23	#include <linux/kernel.h>
	24	#include <linux/usb.h>
	25	#include <linux/init.h>
	26	#include <linux/sound.h>
	27	#include <linux/spinlock.h>
	28	#include <linux/soundcard.h>
	29	#include <linux/slab.h>
	30	#include <linux/vmalloc.h>
	31	#include <linux/proc_fs.h>
	32	#include <linux/module.h>
	33	#include <sound/core.h>
	34	#include <sound/pcm.h>
	35	#include <sound/pcm_params.h>
	36	#include <sound/info.h>
	37	#include <sound/initval.h>
	38	#include <sound/control.h>
	39	#include <media/v4l2-common.h>
	40	#include "cx231xx.h"
	41	#include "cx231xx-pcb-config.h"
	42
	43	static int debug;
	44	module_param(debug, int, 0644);
	45	MODULE_PARM_DESC(debug, "activates debug info");
	46
	47	#define dprintk(fmt, arg...) do { \
	48	if (debug) \
	49	printk(KERN_INFO "cx231xx-audio %s: " fmt, \
	50	__func__, ##arg); \
	51	} while (0)
	52
	53	static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
	54
	55	static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
	56	{
	57	int i;
	58
	59	dprintk("Stopping isoc\n");
	60
e0d3bafd	61	for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
84b5dbf3 MCC	62	if (dev->adev.urb[i]) {
	63	if (!irqs_disabled())
	64	usb_kill_urb(dev->adev.urb[i]);
	65	else
	66	usb_unlink_urb(dev->adev.urb[i]);
e0d3bafd	67
84b5dbf3 MCC	68	usb_free_urb(dev->adev.urb[i]);
84b5dbf3 MCC	69	dev->adev.urb[i] = NULL;
e0d3bafd	70
84b5dbf3 MCC	71	kfree(dev->adev.transfer_buffer[i]);
84b5dbf3 MCC	72	dev->adev.transfer_buffer[i] = NULL;
84b5dbf3	73	}
e0d3bafd SD	74	}
	75
	76	return 0;
	77	}
	78
	79	static void cx231xx_audio_isocirq(struct urb *urb)
	80	{
84b5dbf3 MCC	81	struct cx231xx *dev = urb->context;
	82	int i;
	83	unsigned int oldptr;
	84	int period_elapsed = 0;
	85	int status;
	86	unsigned char *cp;
	87	unsigned int stride;
e0d3bafd	88	struct snd_pcm_substream *substream;
84b5dbf3 MCC	89	struct snd_pcm_runtime *runtime;
	90
	91	switch (urb->status) {
	92	case 0: /* success */
	93	case -ETIMEDOUT: /* NAK */
	94	break;
	95	case -ECONNRESET: /* kill */
	96	case -ENOENT:
	97	case -ESHUTDOWN:
	98	return;
	99	default: /* error */
	100	dprintk("urb completition error %d.\n", urb->status);
	101	break;
e0d3bafd SD	102	}
	103
	104	if (dev->adev.capture_pcm_substream) {
	105	substream = dev->adev.capture_pcm_substream;
	106	runtime = substream->runtime;
	107	stride = runtime->frame_bits >> 3;
	108
	109	for (i = 0; i < urb->number_of_packets; i++) {
cde4362f MCC	110	int length = urb->iso_frame_desc[i].actual_length /
cde4362f MCC	111	stride;
e0d3bafd	112	cp = (unsigned char *)urb->transfer_buffer +
cde4362f	113	urb->iso_frame_desc[i].offset;
e0d3bafd SD	114
	115	if (!length)
	116	continue;
	117
	118	oldptr = dev->adev.hwptr_done_capture;
	119	if (oldptr + length >= runtime->buffer_size) {
cde4362f MCC	120	unsigned int cnt;
	121
	122	cnt = runtime->buffer_size - oldptr;
e0d3bafd SD	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
	132	snd_pcm_stream_lock(substream);
	133
	134	dev->adev.hwptr_done_capture += length;
cde4362f MCC	135	if (dev->adev.hwptr_done_capture >= runtime->buffer_size)
cde4362f MCC	136	dev->adev.hwptr_done_capture -= runtime->buffer_size;
e0d3bafd SD	137
e0d3bafd SD	138	dev->adev.capture_transfer_done += length;
cde4362f MCC	139	if (dev->adev.capture_transfer_done >= runtime->period_size) {
cde4362f MCC	140	dev->adev.capture_transfer_done -= runtime->period_size;
e0d3bafd SD	141	period_elapsed = 1;
e0d3bafd SD	142	}
e0d3bafd SD	143	snd_pcm_stream_unlock(substream);
	144	}
	145	if (period_elapsed)
	146	snd_pcm_period_elapsed(substream);
	147	}
	148	urb->status = 0;
	149
	150	status = usb_submit_urb(urb, GFP_ATOMIC);
	151	if (status < 0) {
	152	cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
84b5dbf3	153	status);
e0d3bafd SD	154	}
	155	return;
	156	}
	157
	158	static int cx231xx_init_audio_isoc(struct cx231xx *dev)
	159	{
84b5dbf3 MCC	160	int i, errCode;
84b5dbf3 MCC	161	int sb_size;
e0d3bafd	162
84b5dbf3	163	cx231xx_info("%s: Starting AUDIO transfers\n", __func__);
e0d3bafd	164
84b5dbf3	165	sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
e0d3bafd SD	166
	167	for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
	168	struct urb *urb;
	169	int j, k;
	170
	171	dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
	172	if (!dev->adev.transfer_buffer[i])
	173	return -ENOMEM;
	174
	175	memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
	176	urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
	177	if (!urb) {
	178	cx231xx_errdev("usb_alloc_urb failed!\n");
	179	for (j = 0; j < i; j++) {
	180	usb_free_urb(dev->adev.urb[j]);
	181	kfree(dev->adev.transfer_buffer[j]);
	182	}
	183	return -ENOMEM;
	184	}
	185
	186	urb->dev = dev->udev;
	187	urb->context = dev;
cde4362f	188	urb->pipe = usb_rcvisocpipe(dev->udev, dev->adev.end_point_addr);
e0d3bafd SD	189	urb->transfer_flags = URB_ISO_ASAP;
	190	urb->transfer_buffer = dev->adev.transfer_buffer[i];
	191	urb->interval = 1;
	192	urb->complete = cx231xx_audio_isocirq;
	193	urb->number_of_packets = CX231XX_NUM_AUDIO_PACKETS;
	194	urb->transfer_buffer_length = sb_size;
	195
cde4362f	196	for (j = k = 0; j < CX231XX_NUM_AUDIO_PACKETS; j++, k += dev->adev.max_pkt_size) {
e0d3bafd	197	urb->iso_frame_desc[j].offset = k;
84b5dbf3	198	urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
e0d3bafd SD	199	}
	200	dev->adev.urb[i] = urb;
	201	}
	202
	203	for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
	204	errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
	205	if (errCode < 0) {
	206	cx231xx_isoc_audio_deinit(dev);
	207	return errCode;
	208	}
	209	}
	210
	211	return errCode;
	212	}
	213
	214	static int cx231xx_cmd(struct cx231xx *dev, int cmd, int arg)
	215	{
84b5dbf3 MCC	216	dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
84b5dbf3 MCC	217	"stop" : "start");
e0d3bafd SD	218
e0d3bafd SD	219	switch (cmd) {
84b5dbf3	220	case CX231XX_CAPTURE_STREAM_EN:
e0d3bafd SD	221	if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
	222	dev->adev.capture_stream = STREAM_ON;
	223	cx231xx_init_audio_isoc(dev);
	224	} else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
	225	dev->adev.capture_stream = STREAM_OFF;
	226	cx231xx_isoc_audio_deinit(dev);
	227	} else {
84b5dbf3 MCC	228	cx231xx_errdev("An underrun very likely occurred. "
84b5dbf3 MCC	229	"Ignoring it.\n");
e0d3bafd SD	230	}
	231	return 0;
	232	default:
	233	return -EINVAL;
	234	}
	235	}
	236
	237	static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
	238	size_t size)
	239	{
	240	struct snd_pcm_runtime *runtime = subs->runtime;
	241
	242	dprintk("Allocating vbuffer\n");
	243	if (runtime->dma_area) {
	244	if (runtime->dma_bytes > size)
	245	return 0;
	246
	247	vfree(runtime->dma_area);
	248	}
	249	runtime->dma_area = vmalloc(size);
	250	if (!runtime->dma_area)
	251	return -ENOMEM;
	252
	253	runtime->dma_bytes = size;
	254
	255	return 0;
	256	}
	257
	258	static struct snd_pcm_hardware snd_cx231xx_hw_capture = {
	259	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER \|
84b5dbf3 MCC	260	SNDRV_PCM_INFO_MMAP \|
84b5dbf3 MCC	261	SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_MMAP_VALID,
e0d3bafd SD	262
	263	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	264
	265	.rates = SNDRV_PCM_RATE_CONTINUOUS \| SNDRV_PCM_RATE_KNOT,
	266
	267	.rate_min = 48000,
	268	.rate_max = 48000,
	269	.channels_min = 2,
	270	.channels_max = 2,
	271	.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
cde4362f	272	.period_bytes_min = 64, /* 12544/2, */
e0d3bafd SD	273	.period_bytes_max = 12544,
e0d3bafd SD	274	.periods_min = 2,
cde4362f	275	.periods_max = 98, /* 12544, */
e0d3bafd SD	276	};
	277
	278	static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
	279	{
	280	struct cx231xx *dev = snd_pcm_substream_chip(substream);
	281	struct snd_pcm_runtime *runtime = substream->runtime;
	282	int ret = 0;
	283
	284	dprintk("opening device and trying to acquire exclusive lock\n");
	285
	286	if (!dev) {
	287	cx231xx_errdev("BUG: cx231xx can't find device struct."
84b5dbf3	288	" Can't proceed with open\n");
e0d3bafd SD	289	return -ENODEV;
	290	}
	291
	292	/* Sets volume, mute, etc */
	293	dev->mute = 0;
	294
84b5dbf3 MCC	295	/* set alternate setting for audio interface */
	296	ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1); /* 1 - 48000 samples per sec */
	297	if (ret < 0) {
	298	cx231xx_errdev("failed to set alternate setting !\n");
e0d3bafd	299
84b5dbf3 MCC	300	return ret;
84b5dbf3 MCC	301	}
e0d3bafd	302
84b5dbf3 MCC	303	/* inform hardware to start streaming */
84b5dbf3 MCC	304	ret = cx231xx_capture_start(dev, 1, Audio);
e0d3bafd SD	305
	306	runtime->hw = snd_cx231xx_hw_capture;
	307
84b5dbf3	308	mutex_lock(&dev->lock);
e0d3bafd	309	dev->adev.users++;
84b5dbf3	310	mutex_unlock(&dev->lock);
e0d3bafd SD	311
	312	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	313	dev->adev.capture_pcm_substream = substream;
	314	runtime->private_data = dev;
	315
	316	return 0;
	317	}
	318
	319	static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
	320	{
84b5dbf3	321	int ret;
e0d3bafd SD	322	struct cx231xx *dev = snd_pcm_substream_chip(substream);
e0d3bafd SD	323
e0d3bafd SD	324	dprintk("closing device\n");
e0d3bafd SD	325
84b5dbf3 MCC	326	/* set alternate setting for audio interface */
	327	ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); /* 1 - 48000 samples per sec */
	328	if (ret < 0) {
	329	cx231xx_errdev("failed to set alternate setting !\n");
e0d3bafd	330
84b5dbf3 MCC	331	return ret;
84b5dbf3 MCC	332	}
e0d3bafd	333
84b5dbf3 MCC	334	/* inform hardware to start streaming */
84b5dbf3 MCC	335	ret = cx231xx_capture_start(dev, 0, Audio);
e0d3bafd SD	336
	337	dev->mute = 1;
	338	mutex_lock(&dev->lock);
84b5dbf3	339	dev->adev.users--;
e0d3bafd SD	340	mutex_unlock(&dev->lock);
	341
	342	if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
	343	dprintk("audio users: %d\n", dev->adev.users);
	344	dprintk("disabling audio stream!\n");
	345	dev->adev.shutdown = 0;
	346	dprintk("released lock\n");
	347	cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, 0);
	348	}
	349	return 0;
	350	}
	351
	352	static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
84b5dbf3	353	struct snd_pcm_hw_params *hw_params)
e0d3bafd SD	354	{
	355	unsigned int channels, rate, format;
	356	int ret;
	357
	358	dprintk("Setting capture parameters\n");
	359
	360	ret = snd_pcm_alloc_vmalloc_buffer(substream,
84b5dbf3	361	params_buffer_bytes(hw_params));
e0d3bafd SD	362	format = params_format(hw_params);
	363	rate = params_rate(hw_params);
	364	channels = params_channels(hw_params);
	365
	366	/* TODO: set up cx231xx audio chip to deliver the correct audio format,
	367	current default is 48000hz multiplexed => 96000hz mono
	368	which shouldn't matter since analogue TV only supports mono */
	369	return 0;
	370	}
	371
	372	static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
	373	{
	374	struct cx231xx *dev = snd_pcm_substream_chip(substream);
	375
	376	dprintk("Stop capture, if needed\n");
	377
	378	if (dev->adev.capture_stream == STREAM_ON)
	379	cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
	380
	381	return 0;
	382	}
	383
	384	static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
	385	{
	386	return 0;
	387	}
	388
	389	static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
84b5dbf3	390	int cmd)
e0d3bafd SD	391	{
e0d3bafd SD	392	struct cx231xx *dev = snd_pcm_substream_chip(substream);
84b5dbf3	393	int retval;
e0d3bafd	394
84b5dbf3 MCC	395	dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START) ?
84b5dbf3 MCC	396	"start" : "stop");
e0d3bafd	397
84b5dbf3	398	spin_lock(&dev->adev.slock);
e0d3bafd SD	399	switch (cmd) {
e0d3bafd SD	400	case SNDRV_PCM_TRIGGER_START:
84b5dbf3 MCC	401	cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN,
84b5dbf3 MCC	402	CX231XX_START_AUDIO);
e0d3bafd SD	403	retval = 0;
	404	break;
	405	case SNDRV_PCM_TRIGGER_STOP:
84b5dbf3	406	cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
e0d3bafd	407	retval = 0;
84b5dbf3	408	break;
e0d3bafd SD	409	default:
	410	retval = -EINVAL;
	411	}
	412
84b5dbf3	413	spin_unlock(&dev->adev.slock);
e0d3bafd SD	414	return retval;
	415	}
	416
	417	static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
84b5dbf3	418	*substream)
e0d3bafd SD	419	{
e0d3bafd SD	420	struct cx231xx *dev;
84b5dbf3	421	unsigned long flags;
e0d3bafd SD	422	snd_pcm_uframes_t hwptr_done;
	423
	424	dev = snd_pcm_substream_chip(substream);
	425
84b5dbf3	426	spin_lock_irqsave(&dev->adev.slock, flags);
e0d3bafd	427	hwptr_done = dev->adev.hwptr_done_capture;
84b5dbf3	428	spin_unlock_irqrestore(&dev->adev.slock, flags);
e0d3bafd SD	429
	430	return hwptr_done;
	431	}
	432
	433	static struct page snd_pcm_get_vmalloc_page(struct snd_pcm_substream subs,
	434	unsigned long offset)
	435	{
	436	void *pageptr = subs->runtime->dma_area + offset;
	437
	438	return vmalloc_to_page(pageptr);
	439	}
	440
	441	static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
84b5dbf3 MCC	442	.open = snd_cx231xx_capture_open,
	443	.close = snd_cx231xx_pcm_close,
	444	.ioctl = snd_pcm_lib_ioctl,
e0d3bafd	445	.hw_params = snd_cx231xx_hw_capture_params,
84b5dbf3 MCC	446	.hw_free = snd_cx231xx_hw_capture_free,
	447	.prepare = snd_cx231xx_prepare,
	448	.trigger = snd_cx231xx_capture_trigger,
	449	.pointer = snd_cx231xx_capture_pointer,
	450	.page = snd_pcm_get_vmalloc_page,
e0d3bafd SD	451	};
	452
	453	static int cx231xx_audio_init(struct cx231xx *dev)
	454	{
	455	struct cx231xx_audio *adev = &dev->adev;
84b5dbf3 MCC	456	struct snd_pcm *pcm;
	457	struct snd_card *card;
	458	static int devnr;
	459	int err;
	460	struct usb_interface *uif;
	461	int i, isoc_pipe = 0;
e0d3bafd SD	462
	463	if (dev->has_alsa_audio != 1) {
	464	/* This device does not support the extension (in this case
	465	the device is expecting the snd-usb-audio module or
	466	doesn't have analog audio support at all) */
	467	return 0;
	468	}
	469
	470	cx231xx_info("cx231xx-audio.c: probing for cx231xx "
84b5dbf3	471	"non standard usbaudio\n");
e0d3bafd SD	472
e0d3bafd SD	473	card = snd_card_new(index[devnr], "Cx231xx Audio", THIS_MODULE, 0);
cde4362f	474	if (card == NULL)
e0d3bafd	475	return -ENOMEM;
e0d3bafd SD	476
	477	spin_lock_init(&adev->slock);
	478	err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
	479	if (err < 0) {
	480	snd_card_free(card);
	481	return err;
	482	}
	483
84b5dbf3 MCC	484	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
84b5dbf3 MCC	485	&snd_cx231xx_pcm_capture);
e0d3bafd SD	486	pcm->info_flags = 0;
	487	pcm->private_data = dev;
	488	strcpy(pcm->name, "Conexant cx231xx Capture");
	489	strcpy(card->driver, "Conexant cx231xx Audio");
	490	strcpy(card->shortname, "Cx231xx Audio");
	491	strcpy(card->longname, "Conexant cx231xx Audio");
	492
	493	err = snd_card_register(card);
	494	if (err < 0) {
	495	snd_card_free(card);
	496	return err;
	497	}
	498	adev->sndcard = card;
	499	adev->udev = dev->udev;
	500
84b5dbf3 MCC	501	/* compute alternate max packet sizes for Audio */
	502	uif =
	503	dev->udev->actconfig->interface[dev->current_pcb_config.
	504	hs_config_info[0].interface_info.
	505	audio_index + 1];
e0d3bafd	506
84b5dbf3 MCC	507	adev->end_point_addr =
	508	le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
	509	bEndpointAddress);
e0d3bafd	510
84b5dbf3 MCC	511	adev->num_alt = uif->num_altsetting;
	512	cx231xx_info(": EndPoint Addr 0x%x, Alternate settings: %i\n",
	513	adev->end_point_addr, adev->num_alt);
	514	adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
e0d3bafd	515
84b5dbf3 MCC	516	if (adev->alt_max_pkt_size == NULL) {
	517	cx231xx_errdev("out of memory!\n");
	518	return -ENOMEM;
	519	}
e0d3bafd	520
84b5dbf3 MCC	521	for (i = 0; i < adev->num_alt; i++) {
	522	u16 tmp =
	523	le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
	524	wMaxPacketSize);
	525	adev->alt_max_pkt_size[i] =
	526	(tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
	527	cx231xx_info("Alternate setting %i, max size= %i\n", i,
	528	adev->alt_max_pkt_size[i]);
	529	}
e0d3bafd SD	530
	531	return 0;
	532	}
	533
	534	static int cx231xx_audio_fini(struct cx231xx *dev)
	535	{
	536	if (dev == NULL)
	537	return 0;
	538
	539	if (dev->has_alsa_audio != 1) {
	540	/* This device does not support the extension (in this case
	541	the device is expecting the snd-usb-audio module or
	542	doesn't have analog audio support at all) */
	543	return 0;
	544	}
	545
	546	if (dev->adev.sndcard) {
	547	snd_card_free(dev->adev.sndcard);
84b5dbf3	548	kfree(dev->adev.alt_max_pkt_size);
e0d3bafd SD	549	dev->adev.sndcard = NULL;
	550	}
	551
	552	return 0;
	553	}
	554
	555	static struct cx231xx_ops audio_ops = {
84b5dbf3	556	.id = CX231XX_AUDIO,
e0d3bafd SD	557	.name = "Cx231xx Audio Extension",
	558	.init = cx231xx_audio_init,
	559	.fini = cx231xx_audio_fini,
	560	};
	561
	562	static int __init cx231xx_alsa_register(void)
	563	{
	564	return cx231xx_register_extension(&audio_ops);
	565	}
	566
	567	static void __exit cx231xx_alsa_unregister(void)
	568	{
	569	cx231xx_unregister_extension(&audio_ops);
	570	}
	571
	572	MODULE_LICENSE("GPL");
	573	MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
	574	MODULE_DESCRIPTION("Cx231xx Audio driver");
	575
	576	module_init(cx231xx_alsa_register);
	577	module_exit(cx231xx_alsa_unregister);