V4L/DVB (10954): Add cx231xx USB driver

obj-$(CONFIG_VIDEO_SAA7134) += saa7134/

obj-$(CONFIG_VIDEO_CX88) += cx88/

obj-$(CONFIG_VIDEO_EM28XX) += em28xx/

obj-$(CONFIG_VIDEO_CX231XX) += cx231xx/

obj-$(CONFIG_VIDEO_USBVISION) += usbvision/

obj-$(CONFIG_VIDEO_TVP5150) += tvp5150.o

obj-$(CONFIG_VIDEO_TVP514X) += tvp514x.o

config VIDEO_CX231XX

	tristate "Conexant cx231xx USB video capture support"

	depends on VIDEO_DEV && I2C && INPUT

	select VIDEO_TUNER

	select VIDEO_TVEEPROM

	select VIDEO_IR

	select VIDEOBUF_VMALLOC

	select VIDEO_CX25840

	select VIDEO_CX231XX_ALSA

	---help---

	  This is a video4linux driver for Conexant 231xx USB based TV cards.

	  To compile this driver as a module, choose M here: the

	  module will be called cx231xx

config VIDEO_CX231XX_ALSA

    tristate "Conexant Cx231xx ALSA audio module"

	depends on VIDEO_CX231XX && SND

	select SND_PCM

	---help---

	  This is an ALSA driver for Cx231xx USB based TV cards.

	  To compile this driver as a module, choose M here: the

	  module will be called cx231xx-alsa

config VIDEO_CX231XX_DVB

	tristate "DVB/ATSC Support for Cx231xx based TV cards"

	depends on VIDEO_CX231XX && DVB_CORE

	select VIDEOBUF_DVB

	select MEDIA_TUNER_XC5000 if !DVB_FE_CUSTOMIZE

	---help---

	  This adds support for DVB cards based on the

	  Conexant cx231xx chips.

cx231xx-objs     := cx231xx-video.o cx231xx-i2c.o cx231xx-cards.o cx231xx-core.o \

                    cx231xx-avcore.o cx231xx-pcb-config.o cx231xx-vbi.o

cx231xx-alsa-objs := cx231xx-audio.o

obj-$(CONFIG_VIDEO_CX231XX) += cx231xx.o

obj-$(CONFIG_VIDEO_CX231XX_ALSA) += cx231xx-alsa.o

obj-$(CONFIG_VIDEO_CX231XX_DVB) += cx231xx-dvb.o

EXTRA_CFLAGS += -Idrivers/media/video

EXTRA_CFLAGS += -Idrivers/media/common/tuners

EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core

EXTRA_CFLAGS += -Idrivers/media/dvb/frontends

/*

 *  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 =

				    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);