em28xx-video.c

/*
   em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB video capture devices

   Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
		      Markus Rechberger <mrechberger@gmail.com>
		      Mauro Carvalho Chehab <mchehab@brturbo.com.br>
		      Sascha Sommer <saschasommer@freenet.de>

	Some parts based on SN9C10x PC Camera Controllers GPL driver made
		by Luca Risolia <luca.risolia@studio.unibo.it>

   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/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bitmap.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#include <linux/version.h>
#include <linux/video_decoder.h>
#include <linux/mutex.h>

#include "em28xx.h"
#include <media/tuner.h>
#include <media/v4l2-common.h>

#define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
		      "Markus Rechberger <mrechberger@gmail.com>, " \
		      "Mauro Carvalho Chehab <mchehab@brturbo.com.br>, " \
		      "Sascha Sommer <saschasommer@freenet.de>"

#define DRIVER_NAME         "em28xx"
#define DRIVER_DESC         "Empia em28xx based USB video device driver"
#define EM28XX_VERSION_CODE  KERNEL_VERSION(0, 0, 1)

#define em28xx_videodbg(fmt, arg...) do {\
	if (video_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __FUNCTION__ , ##arg); } while (0)

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

static LIST_HEAD(em28xx_devlist);

static unsigned int card[]     = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
static unsigned int vbi_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
module_param_array(card,  int, NULL, 0444);
module_param_array(video_nr, int, NULL, 0444);
module_param_array(vbi_nr, int, NULL, 0444);
MODULE_PARM_DESC(card,"card type");
MODULE_PARM_DESC(video_nr,"video device numbers");
MODULE_PARM_DESC(vbi_nr,"vbi device numbers");

static int tuner = -1;
module_param(tuner, int, 0444);
MODULE_PARM_DESC(tuner, "tuner type");

static unsigned int video_debug = 0;
module_param(video_debug,int,0644);
MODULE_PARM_DESC(video_debug,"enable debug messages [video]");

/* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
static unsigned long em28xx_devused;

/* supported tv norms */
static struct em28xx_tvnorm tvnorms[] = {
	{
		.name = "PAL",
		.id = V4L2_STD_PAL,
		.mode = VIDEO_MODE_PAL,
	 }, {
		.name = "NTSC",
		.id = V4L2_STD_NTSC,
		.mode = VIDEO_MODE_NTSC,
	}, {
		 .name = "SECAM",
		 .id = V4L2_STD_SECAM,
		 .mode = VIDEO_MODE_SECAM,
	}, {
		.name = "PAL-M",
		.id = V4L2_STD_PAL_M,
		.mode = VIDEO_MODE_PAL,
	}
};

static const unsigned char saa7114_i2c_init[] = {
	0x00,0x00,0x01,0x08,0x02,0xc4,0x03,0x30,0x04,0x90,0x05,0x90,0x06,0xeb,0x07,0xe0,
	0x08,0x88,0x09,0x40,0x0a,0x80,0x0b,0x44,0x0c,0x40,0x0d,0x00,0x0e,0x81,0x0f,0x2a,
	0x10,0x06,0x11,0x00,0x12,0xc8,0x13,0x80,0x14,0x00,0x15,0x11,0x16,0x01,0x17,0x42,
	0x18,0x40,0x19,0x80,0x40,0x00,0x41,0xff,0x42,0xff,0x43,0xff,0x44,0xff,0x45,0xff,
	0x46,0xff,0x47,0xff,0x48,0xff,0x49,0xff,0x4a,0xff,0x4b,0xff,0x4c,0xff,0x4d,0xff,
	0x4e,0xff,0x4f,0xff,0x50,0xff,0x51,0xff,0x52,0xff,0x53,0xff,0x54,0x5f,0x55,0xff,
	0x56,0xff,0x57,0xff,0x58,0x00,0x59,0x47,0x5a,0x03,0x5b,0x03,0x5d,0x3e,0x5e,0x00,
	0x80,0x1c,0x83,0x01,0x84,0xa5,0x85,0x10,0x86,0x45,0x87,0x41,0x88,0xf0,0x88,0x00,
	0x88,0xf0,0x90,0x00,0x91,0x08,0x92,0x00,0x93,0x80,0x94,0x08,0x95,0x00,0x96,0xc0,
	0x97,0x02,0x98,0x13,0x99,0x00,0x9a,0x38,0x9b,0x01,0x9c,0x80,0x9d,0x02,0x9e,0x06,
	0x9f,0x01,0xa0,0x01,0xa1,0x00,0xa2,0x00,0xa4,0x80,0xa5,0x36,0xa6,0x36,0xa8,0x67,
	0xa9,0x04,0xaa,0x00,0xac,0x33,0xad,0x02,0xae,0x00,0xb0,0xcd,0xb1,0x04,0xb2,0xcd,
	0xb3,0x04,0xb4,0x01,0xb8,0x00,0xb9,0x00,0xba,0x00,0xbb,0x00,0xbc,0x00,0xbd,0x00,
	0xbe,0x00,0xbf,0x00
};

#define TVNORMS ARRAY_SIZE(tvnorms)

/* supported controls */
/* Common to all boards */
static struct v4l2_queryctrl em28xx_qctrl[] = {
	{
		.id = V4L2_CID_AUDIO_VOLUME,
		.type = V4L2_CTRL_TYPE_INTEGER,
		.name = "Volume",
		.minimum = 0x0,
		.maximum = 0x1f,
		.step = 0x1,
		.default_value = 0x1f,
		.flags = 0,
	},{
		.id = V4L2_CID_AUDIO_MUTE,
		.type = V4L2_CTRL_TYPE_BOOLEAN,
		.name = "Mute",
		.minimum = 0,
		.maximum = 1,
		.step = 1,
		.default_value = 1,
		.flags = 0,
	}
};

/* FIXME: These are specific to saa711x - should be moved to its code */
static struct v4l2_queryctrl saa711x_qctrl[] = {
	{
		.id = V4L2_CID_BRIGHTNESS,
		.type = V4L2_CTRL_TYPE_INTEGER,
		.name = "Brightness",
		.minimum = -128,
		.maximum = 127,
		.step = 1,
		.default_value = 0,
		.flags = 0,
	},{
		.id = V4L2_CID_CONTRAST,
		.type = V4L2_CTRL_TYPE_INTEGER,
		.name = "Contrast",
		.minimum = 0x0,
		.maximum = 0x1f,
		.step = 0x1,
		.default_value = 0x10,
		.flags = 0,
	},{
		.id = V4L2_CID_SATURATION,
		.type = V4L2_CTRL_TYPE_INTEGER,
		.name = "Saturation",
		.minimum = 0x0,
		.maximum = 0x1f,
		.step = 0x1,
		.default_value = 0x10,
		.flags = 0,
	},{
		.id = V4L2_CID_RED_BALANCE,
		.type = V4L2_CTRL_TYPE_INTEGER,
		.name = "Red chroma balance",
		.minimum = -128,
		.maximum = 127,
		.step = 1,
		.default_value = 0,
		.flags = 0,
	},{
		.id = V4L2_CID_BLUE_BALANCE,
		.type = V4L2_CTRL_TYPE_INTEGER,
		.name = "Blue chroma balance",
		.minimum = -128,
		.maximum = 127,
		.step = 1,
		.default_value = 0,
		.flags = 0,
	},{
		.id = V4L2_CID_GAMMA,
		.type = V4L2_CTRL_TYPE_INTEGER,
		.name = "Gamma",
		.minimum = 0x0,
		.maximum = 0x3f,
		.step = 0x1,
		.default_value = 0x20,
		.flags = 0,
	}
};

static struct usb_driver em28xx_usb_driver;

static DEFINE_MUTEX(em28xx_sysfs_lock);
static DECLARE_RWSEM(em28xx_disconnect);

/*********************  v4l2 interface  ******************************************/

/*
 * em28xx_config()
 * inits registers with sane defaults
 */
static int em28xx_config(struct em28xx *dev)
{

	/* Sets I2C speed to 100 KHz */
	em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);

	/* enable vbi capturing */

/*	em28xx_write_regs_req(dev,0x00,0x0e,"\xC0",1); audio register */
/*	em28xx_write_regs_req(dev,0x00,0x0f,"\x80",1); clk register */
	em28xx_write_regs_req(dev,0x00,0x11,"\x51",1);

	em28xx_audio_usb_mute(dev, 1);
	dev->mute = 1;		/* maybe not the right place... */
	dev->volume = 0x1f;
	em28xx_audio_analog_set(dev);
	em28xx_audio_analog_setup(dev);
	em28xx_outfmt_set_yuv422(dev);
	em28xx_colorlevels_set_default(dev);
	em28xx_compression_disable(dev);

	return 0;
}

/*
 * em28xx_config_i2c()
 * configure i2c attached devices
 */
static void em28xx_config_i2c(struct em28xx *dev)
{
	struct v4l2_frequency f;
	struct video_decoder_init em28xx_vdi = {.data = NULL };


	/* configure decoder */
	if(dev->model == EM2820_BOARD_MSI_VOX_USB_2){
		em28xx_vdi.data=saa7114_i2c_init;
		em28xx_vdi.len=sizeof(saa7114_i2c_init);
	}


	em28xx_i2c_call_clients(dev, DECODER_INIT, &em28xx_vdi);
	em28xx_i2c_call_clients(dev, DECODER_SET_INPUT, &dev->ctl_input);
/*	em28xx_i2c_call_clients(dev,DECODER_SET_PICTURE, &dev->vpic); */
/*	em28xx_i2c_call_clients(dev,DECODER_SET_NORM,&dev->tvnorm->id); */
/*	em28xx_i2c_call_clients(dev,DECODER_ENABLE_OUTPUT,&output); */
/*	em28xx_i2c_call_clients(dev,DECODER_DUMP, NULL); */

	/* configure tuner */
	f.tuner = 0;
	f.type = V4L2_TUNER_ANALOG_TV;
	f.frequency = 9076;	/* FIXME:remove magic number */
	dev->ctl_freq = f.frequency;
	em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);

	/* configure tda9887 */


/*	em28xx_i2c_call_clients(dev,VIDIOC_S_STD,&dev->tvnorm->id); */
}

/*
 * em28xx_empty_framequeues()
 * prepare queues for incoming and outgoing frames
 */
static void em28xx_empty_framequeues(struct em28xx *dev)
{
	u32 i;

	INIT_LIST_HEAD(&dev->inqueue);
	INIT_LIST_HEAD(&dev->outqueue);

	for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
		dev->frame[i].state = F_UNUSED;
		dev->frame[i].buf.bytesused = 0;
	}
}

static void video_mux(struct em28xx *dev, int index)
{
	int input, ainput;

	input = INPUT(index)->vmux;
	dev->ctl_input = index;
	dev->ctl_ainput = INPUT(index)->amux;

	em28xx_i2c_call_clients(dev, DECODER_SET_INPUT, &input);


	em28xx_videodbg("Setting input index=%d, vmux=%d, amux=%d\n",index,input,dev->ctl_ainput);

	if (dev->has_msp34xx) {
		if (dev->i2s_speed)
			em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ, &dev->i2s_speed);
		em28xx_i2c_call_clients(dev, VIDIOC_S_AUDIO, &dev->ctl_ainput);
		ainput = EM28XX_AUDIO_SRC_TUNER;
		em28xx_audio_source(dev, ainput);
	} else {
		switch (dev->ctl_ainput) {
			case 0:
				ainput = EM28XX_AUDIO_SRC_TUNER;
				break;
			default:
				ainput = EM28XX_AUDIO_SRC_LINE;
		}
		em28xx_audio_source(dev, ainput);
	}
}

/*
 * em28xx_v4l2_open()
 * inits the device and starts isoc transfer
 */
static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
{
	int minor = iminor(inode);
	int errCode = 0;
	struct em28xx *h,*dev = NULL;
	struct list_head *list;

	list_for_each(list,&em28xx_devlist) {
		h = list_entry(list, struct em28xx, devlist);
		if (h->vdev->minor == minor) {
			dev  = h;
			dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
		}
		if (h->vbi_dev->minor == minor) {
			dev  = h;
			dev->type = V4L2_BUF_TYPE_VBI_CAPTURE;
		}
	}
	if (NULL == dev)
		return -ENODEV;

	filp->private_data=dev;

	em28xx_videodbg("open minor=%d type=%s users=%d\n",
				minor,v4l2_type_names[dev->type],dev->users);

	if (!down_read_trylock(&em28xx_disconnect))
		return -ERESTARTSYS;

	if (dev->users) {
		em28xx_warn("this driver can be opened only once\n");
		up_read(&em28xx_disconnect);
		return -EBUSY;
	}

	mutex_init(&dev->fileop_lock);	/* to 1 == available */
	spin_lock_init(&dev->queue_lock);
	init_waitqueue_head(&dev->wait_frame);
	init_waitqueue_head(&dev->wait_stream);

	mutex_lock(&dev->lock);

	if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
		em28xx_set_alternate(dev);

		dev->width = norm_maxw(dev);
		dev->height = norm_maxh(dev);
		dev->frame_size = dev->width * dev->height * 2;
		dev->field_size = dev->frame_size >> 1;	/*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
		dev->bytesperline = dev->width * 2;
		dev->hscale = 0;
		dev->vscale = 0;

		em28xx_capture_start(dev, 1);
		em28xx_resolution_set(dev);

		/* device needs to be initialized before isoc transfer */
		video_mux(dev, 0);

		/* start the transfer */
		errCode = em28xx_init_isoc(dev);
		if (errCode)
			goto err;

	}

	dev->users++;
	filp->private_data = dev;
	dev->io = IO_NONE;
	dev->stream = STREAM_OFF;
	dev->num_frames = 0;

	/* prepare queues */
	em28xx_empty_framequeues(dev);

	dev->state |= DEV_INITIALIZED;

err:
	mutex_unlock(&dev->lock);
	up_read(&em28xx_disconnect);
	return errCode;
}

/*
 * em28xx_realease_resources()
 * unregisters the v4l2,i2c and usb devices
 * called when the device gets disconected or at module unload
*/
static void em28xx_release_resources(struct em28xx *dev)
{
	mutex_lock(&em28xx_sysfs_lock);

	/*FIXME: I2C IR should be disconnected */

	em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
				dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
				dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
	list_del(&dev->devlist);
	video_unregister_device(dev->vdev);
	video_unregister_device(dev->vbi_dev);
	em28xx_i2c_unregister(dev);
	usb_put_dev(dev->udev);
	mutex_unlock(&em28xx_sysfs_lock);


	/* Mark device as unused */
	em28xx_devused&=~(1<<dev->devno);
}

/*
 * em28xx_v4l2_close()
 * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
 */
static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
{
	int errCode;
	struct em28xx *dev=filp->private_data;

	em28xx_videodbg("users=%d\n", dev->users);

	mutex_lock(&dev->lock);

	em28xx_uninit_isoc(dev);

	em28xx_release_buffers(dev);

	/* the device is already disconnect, free the remaining resources */
	if (dev->state & DEV_DISCONNECTED) {
		em28xx_release_resources(dev);
		mutex_unlock(&dev->lock);
		kfree(dev);
		return 0;
	}

	/* set alternate 0 */
	dev->alt = 0;
	em28xx_videodbg("setting alternate 0\n");
	errCode = usb_set_interface(dev->udev, 0, 0);
	if (errCode < 0) {
		em28xx_errdev ("cannot change alternate number to 0 (error=%i)\n",
		     errCode);
	}

	dev->users--;
	wake_up_interruptible_nr(&dev->open, 1);
	mutex_unlock(&dev->lock);
	return 0;
}

/*
 * em28xx_v4l2_read()
 * will allocate buffers when called for the first time
 */
static ssize_t
em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
		 loff_t * f_pos)
{
	struct em28xx_frame_t *f, *i;
	unsigned long lock_flags;
	int ret = 0;
	struct em28xx *dev = filp->private_data;

	if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
		em28xx_videodbg("V4l2_Buf_type_videocapture is set\n");
	}
	if (dev->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
		em28xx_videodbg("V4L2_BUF_TYPE_VBI_CAPTURE is set\n");
		em28xx_videodbg("not supported yet! ...\n");
		if (copy_to_user(buf, "", 1)) {
			mutex_unlock(&dev->fileop_lock);
			return -EFAULT;
		}
		return (1);
	}
	if (dev->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
		em28xx_videodbg("V4L2_BUF_TYPE_SLICED_VBI_CAPTURE is set\n");
		em28xx_videodbg("not supported yet! ...\n");
		if (copy_to_user(buf, "", 1)) {
			mutex_unlock(&dev->fileop_lock);
			return -EFAULT;
		}
		return (1);
	}

	if (mutex_lock_interruptible(&dev->fileop_lock))
		return -ERESTARTSYS;

	if (dev->state & DEV_DISCONNECTED) {
		em28xx_videodbg("device not present\n");
		mutex_unlock(&dev->fileop_lock);
		return -ENODEV;
	}

	if (dev->state & DEV_MISCONFIGURED) {
		em28xx_videodbg("device misconfigured; close and open it again\n");
		mutex_unlock(&dev->fileop_lock);
		return -EIO;
	}

	if (dev->io == IO_MMAP) {
		em28xx_videodbg ("IO method is set to mmap; close and open"
				" the device again to choose the read method\n");
		mutex_unlock(&dev->fileop_lock);
		return -EINVAL;
	}

	if (dev->io == IO_NONE) {
		if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
			em28xx_errdev("read failed, not enough memory\n");
			mutex_unlock(&dev->fileop_lock);
			return -ENOMEM;
		}
		dev->io = IO_READ;
		dev->stream = STREAM_ON;
		em28xx_queue_unusedframes(dev);
	}

	if (!count) {
		mutex_unlock(&dev->fileop_lock);
		return 0;
	}

	if (list_empty(&dev->outqueue)) {
		if (filp->f_flags & O_NONBLOCK) {
			mutex_unlock(&dev->fileop_lock);
			return -EAGAIN;
		}
		ret = wait_event_interruptible
		    (dev->wait_frame,
		     (!list_empty(&dev->outqueue)) ||
		     (dev->state & DEV_DISCONNECTED));
		if (ret) {
			mutex_unlock(&dev->fileop_lock);
			return ret;
		}
		if (dev->state & DEV_DISCONNECTED) {
			mutex_unlock(&dev->fileop_lock);
			return -ENODEV;
		}
	}

	f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);

	spin_lock_irqsave(&dev->queue_lock, lock_flags);
	list_for_each_entry(i, &dev->outqueue, frame)
	    i->state = F_UNUSED;
	INIT_LIST_HEAD(&dev->outqueue);
	spin_unlock_irqrestore(&dev->queue_lock, lock_flags);

	em28xx_queue_unusedframes(dev);

	if (count > f->buf.length)
		count = f->buf.length;

	if (copy_to_user(buf, f->bufmem, count)) {
		mutex_unlock(&dev->fileop_lock);
		return -EFAULT;
	}
	*f_pos += count;

	mutex_unlock(&dev->fileop_lock);

	return count;
}

/*
 * em28xx_v4l2_poll()
 * will allocate buffers when called for the first time
 */
static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
{
	unsigned int mask = 0;
	struct em28xx *dev = filp->private_data;

	if (mutex_lock_interruptible(&dev->fileop_lock))
		return POLLERR;

	if (dev->state & DEV_DISCONNECTED) {
		em28xx_videodbg("device not present\n");
	} else if (dev->state & DEV_MISCONFIGURED) {
		em28xx_videodbg("device is misconfigured; close and open it again\n");
	} else {
		if (dev->io == IO_NONE) {
			if (!em28xx_request_buffers
			    (dev, EM28XX_NUM_READ_FRAMES)) {
				em28xx_warn
				    ("poll() failed, not enough memory\n");
			} else {
				dev->io = IO_READ;
				dev->stream = STREAM_ON;
			}
		}

		if (dev->io == IO_READ) {
			em28xx_queue_unusedframes(dev);
			poll_wait(filp, &dev->wait_frame, wait);

			if (!list_empty(&dev->outqueue))
				mask |= POLLIN | POLLRDNORM;

			mutex_unlock(&dev->fileop_lock);

			return mask;
		}
	}

	mutex_unlock(&dev->fileop_lock);
	return POLLERR;
}

/*
 * em28xx_vm_open()
 */
static void em28xx_vm_open(struct vm_area_struct *vma)
{
	struct em28xx_frame_t *f = vma->vm_private_data;
	f->vma_use_count++;
}

/*
 * em28xx_vm_close()
 */
static void em28xx_vm_close(struct vm_area_struct *vma)
{
	/* NOTE: buffers are not freed here */
	struct em28xx_frame_t *f = vma->vm_private_data;
	f->vma_use_count--;
}

static struct vm_operations_struct em28xx_vm_ops = {
	.open = em28xx_vm_open,
	.close = em28xx_vm_close,
};

/*
 * em28xx_v4l2_mmap()
 */
static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
{
	unsigned long size = vma->vm_end - vma->vm_start,
	    start = vma->vm_start;
	void *pos;
	u32 i;

	struct em28xx *dev = filp->private_data;

	if (mutex_lock_interruptible(&dev->fileop_lock))
		return -ERESTARTSYS;

	if (dev->state & DEV_DISCONNECTED) {
		em28xx_videodbg("mmap: device not present\n");
		mutex_unlock(&dev->fileop_lock);
		return -ENODEV;
	}

	if (dev->state & DEV_MISCONFIGURED) {
		em28xx_videodbg ("mmap: Device is misconfigured; close and "
						"open it again\n");
		mutex_unlock(&dev->fileop_lock);
		return -EIO;
	}

	if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
	    size != PAGE_ALIGN(dev->frame[0].buf.length)) {
		mutex_unlock(&dev->fileop_lock);
		return -EINVAL;
	}

	for (i = 0; i < dev->num_frames; i++) {
		if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
			break;
	}
	if (i == dev->num_frames) {
		em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
		mutex_unlock(&dev->fileop_lock);
		return -EINVAL;
	}

	/* VM_IO is eventually going to replace PageReserved altogether */
	vma->vm_flags |= VM_IO;
	vma->vm_flags |= VM_RESERVED;	/* avoid to swap out this VMA */

	pos = dev->frame[i].bufmem;
	while (size > 0) {	/* size is page-aligned */
		if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
			em28xx_videodbg("mmap: vm_insert_page failed\n");
			mutex_unlock(&dev->fileop_lock);
			return -EAGAIN;
		}
		start += PAGE_SIZE;
		pos += PAGE_SIZE;
		size -= PAGE_SIZE;
	}

	vma->vm_ops = &em28xx_vm_ops;
	vma->vm_private_data = &dev->frame[i];

	em28xx_vm_open(vma);
	mutex_unlock(&dev->fileop_lock);
	return 0;
}

/*
 * em28xx_get_ctrl()
 * return the current saturation, brightness or contrast, mute state
 */
static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
{
	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		ctrl->value = dev->mute;
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		ctrl->value = dev->volume;
		return 0;
	default:
		return -EINVAL;
	}
}

/*FIXME: should be moved to saa711x */
static int saa711x_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
{
	s32 tmp;
	switch (ctrl->id) {
	case V4L2_CID_BRIGHTNESS:
		if ((tmp = em28xx_brightness_get(dev)) < 0)
			return -EIO;
		ctrl->value = (s32) ((s8) tmp);	/* FIXME: clenaer way to extend sign? */
		return 0;
	case V4L2_CID_CONTRAST:
		if ((ctrl->value = em28xx_contrast_get(dev)) < 0)
			return -EIO;
		return 0;
	case V4L2_CID_SATURATION:
		if ((ctrl->value = em28xx_saturation_get(dev)) < 0)
			return -EIO;
		return 0;
	case V4L2_CID_RED_BALANCE:
		if ((tmp = em28xx_v_balance_get(dev)) < 0)
			return -EIO;
		ctrl->value = (s32) ((s8) tmp);	/* FIXME: clenaer way to extend sign? */
		return 0;
	case V4L2_CID_BLUE_BALANCE:
		if ((tmp = em28xx_u_balance_get(dev)) < 0)
			return -EIO;
		ctrl->value = (s32) ((s8) tmp);	/* FIXME: clenaer way to extend sign? */
		return 0;
	case V4L2_CID_GAMMA:
		if ((ctrl->value = em28xx_gamma_get(dev)) < 0)
			return -EIO;
		return 0;
	default:
		return -EINVAL;
	}
}

/*
 * em28xx_set_ctrl()
 * mute or set new saturation, brightness or contrast
 */
static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
{
	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		if (ctrl->value != dev->mute) {
			dev->mute = ctrl->value;
			em28xx_audio_usb_mute(dev, ctrl->value);
			return em28xx_audio_analog_set(dev);
		}
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		dev->volume = ctrl->value;
		return em28xx_audio_analog_set(dev);
	default:
		return -EINVAL;
	}
}

/*FIXME: should be moved to saa711x */
static int saa711x_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
{
	switch (ctrl->id) {
	case V4L2_CID_BRIGHTNESS:
		return em28xx_brightness_set(dev, ctrl->value);
	case V4L2_CID_CONTRAST:
		return em28xx_contrast_set(dev, ctrl->value);
	case V4L2_CID_SATURATION:
		return em28xx_saturation_set(dev, ctrl->value);
	case V4L2_CID_RED_BALANCE:
		return em28xx_v_balance_set(dev, ctrl->value);
	case V4L2_CID_BLUE_BALANCE:
		return em28xx_u_balance_set(dev, ctrl->value);
	case V4L2_CID_GAMMA:
		return em28xx_gamma_set(dev, ctrl->value);
	default:
		return -EINVAL;
	}
}

/*
 * em28xx_stream_interrupt()
 * stops streaming
 */
static int em28xx_stream_interrupt(struct em28xx *dev)
{
	int ret = 0;

	/* stop reading from the device */

	dev->stream = STREAM_INTERRUPT;
	ret = wait_event_timeout(dev->wait_stream,
				 (dev->stream == STREAM_OFF) ||
				 (dev->state & DEV_DISCONNECTED),
				 EM28XX_URB_TIMEOUT);
	if (dev->state & DEV_DISCONNECTED)
		return -ENODEV;
	else if (ret) {
		dev->state |= DEV_MISCONFIGURED;
		em28xx_videodbg("device is misconfigured; close and "
			"open /dev/video%d again\n",
				dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
		return ret;
	}

	return 0;
}

static int em28xx_set_norm(struct em28xx *dev, int width, int height)
{
	unsigned int hscale, vscale;
	unsigned int maxh, maxw;

	maxw = norm_maxw(dev);
	maxh = norm_maxh(dev);

	/* width must even because of the YUYV format */
	/* height must be even because of interlacing */
	height &= 0xfffe;
	width &= 0xfffe;

	if (height < 32)
		height = 32;
	if (height > maxh)
		height = maxh;
	if (width < 48)
		width = 48;
	if (width > maxw)
		width = maxw;

	if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
		hscale = 0x3fff;
	width = (((unsigned long)maxw) << 12) / (hscale + 4096L);

	if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
		vscale = 0x3fff;
	height = (((unsigned long)maxh) << 12) / (vscale + 4096L);

	/* set new image size */
	dev->width = width;
	dev->height = height;
	dev->frame_size = dev->width * dev->height * 2;
	dev->field_size = dev->frame_size >> 1;	/*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
	dev->bytesperline = dev->width * 2;
	dev->hscale = hscale;
	dev->vscale = vscale;

	em28xx_resolution_set(dev);

	return 0;
}

static int em28xx_get_fmt(struct em28xx *dev, struct v4l2_format *format)
{
	em28xx_videodbg("VIDIOC_G_FMT: type=%s\n",
		(format->type ==V4L2_BUF_TYPE_VIDEO_CAPTURE) ?
		"V4L2_BUF_TYPE_VIDEO_CAPTURE" :
		(format->type ==V4L2_BUF_TYPE_VBI_CAPTURE) ?
		"V4L2_BUF_TYPE_VBI_CAPTURE" :
		(format->type ==V4L2_CAP_SLICED_VBI_CAPTURE) ?
		"V4L2_BUF_TYPE_SLICED_VBI_CAPTURE " :
		"not supported");

	switch (format->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
	{
		format->fmt.pix.width = dev->width;
		format->fmt.pix.height = dev->height;
		format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
		format->fmt.pix.bytesperline = dev->bytesperline;
		format->fmt.pix.sizeimage = dev->frame_size;
		format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
		format->fmt.pix.field = dev->interlaced ? V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;	/* FIXME: TOP? NONE? BOTTOM? ALTENATE? */

		em28xx_videodbg("VIDIOC_G_FMT: %dx%d\n", dev->width,
			dev->height);
		break;
	}

	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
	{
		format->fmt.sliced.service_set=0;

		em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);

		if (format->fmt.sliced.service_set==0)
			return -EINVAL;

		break;
	}

	default:
		return -EINVAL;
	}
	return (0);
}

static int em28xx_set_fmt(struct em28xx *dev, unsigned int cmd, struct v4l2_format *format)
{
	u32 i;
	int ret = 0;
	int width = format->fmt.pix.width;
	int height = format->fmt.pix.height;
	unsigned int hscale, vscale;
	unsigned int maxh, maxw;

	maxw = norm_maxw(dev);
	maxh = norm_maxh(dev);

	em28xx_videodbg("%s: type=%s\n",
			cmd == VIDIOC_TRY_FMT ?
			"VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
			format->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ?
			"V4L2_BUF_TYPE_VIDEO_CAPTURE" :
			format->type == V4L2_BUF_TYPE_VBI_CAPTURE ?
			"V4L2_BUF_TYPE_VBI_CAPTURE " :
			"not supported");

	if (format->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
		em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);

		if (format->fmt.sliced.service_set==0)
			return -EINVAL;

		return 0;
	}


	if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	em28xx_videodbg("%s: requested %dx%d\n",
		cmd == VIDIOC_TRY_FMT ?
		"VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
		format->fmt.pix.width, format->fmt.pix.height);

	/* FIXME: Move some code away from here */
	/* width must even because of the YUYV format */
	/* height must be even because of interlacing */
	height &= 0xfffe;
	width &= 0xfffe;

	if (height < 32)
		height = 32;
	if (height > maxh)
		height = maxh;
	if (width < 48)
		width = 48;
	if (width > maxw)
		width = maxw;

	if(dev->is_em2800){
		/* the em2800 can only scale down to 50% */
		if(height % (maxh / 2))
			height=maxh;
		if(width % (maxw / 2))
			width=maxw;
		/* according to empiatech support */
		/* the MaxPacketSize is to small to support */
		/* framesizes larger than 640x480 @ 30 fps */
		/* or 640x576 @ 25 fps. As this would cut */
		/* of a part of the image we prefer */
		/* 360x576 or 360x480 for now */
		if(width == maxw && height == maxh)
			width /= 2;
	}

	if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
		hscale = 0x3fff;

	width = (((unsigned long)maxw) << 12) / (hscale + 4096L);

	if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
		vscale = 0x3fff;

	height = (((unsigned long)maxh) << 12) / (vscale + 4096L);

	format->fmt.pix.width = width;
	format->fmt.pix.height = height;
	format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
	format->fmt.pix.bytesperline = width * 2;
	format->fmt.pix.sizeimage = width * 2 * height;
	format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
	format->fmt.pix.field = V4L2_FIELD_INTERLACED;

	em28xx_videodbg("%s: returned %dx%d (%d, %d)\n",
		cmd == VIDIOC_TRY_FMT ?
		"VIDIOC_TRY_FMT" :"VIDIOC_S_FMT",
		format->fmt.pix.width, format->fmt.pix.height, hscale, vscale);

	if (cmd == VIDIOC_TRY_FMT)
		return 0;

	for (i = 0; i < dev->num_frames; i++)
		if (dev->frame[i].vma_use_count) {
			em28xx_videodbg("VIDIOC_S_FMT failed. "
				"Unmap the buffers first.\n");
			return -EINVAL;
		}

	/* stop io in case it is already in progress */
	if (dev->stream == STREAM_ON) {
		em28xx_videodbg("VIDIOC_SET_FMT: interupting stream\n");
		if ((ret = em28xx_stream_interrupt(dev)))
			return ret;
	}

	em28xx_release_buffers(dev);
	dev->io = IO_NONE;

	/* set new image size */
	dev->width = width;
	dev->height = height;
	dev->frame_size = dev->width * dev->height * 2;
	dev->field_size = dev->frame_size >> 1;
	dev->bytesperline = dev->width * 2;
	dev->hscale = hscale;
	dev->vscale = vscale;
	em28xx_uninit_isoc(dev);
	em28xx_set_alternate(dev);
	em28xx_capture_start(dev, 1);
	em28xx_resolution_set(dev);
	em28xx_init_isoc(dev);

	return 0;
}

/*
 * em28xx_v4l2_do_ioctl()
 * This function is _not_ called directly, but from
 * em28xx_v4l2_ioctl. Userspace
 * copying is done already, arg is a kernel pointer.
 */
static int em28xx_do_ioctl(struct inode *inode, struct file *filp,
			   struct em28xx *dev, unsigned int cmd, void *arg,
			   v4l2_kioctl driver_ioctl)
{
	int ret;

	switch (cmd) {
		/* ---------- tv norms ---------- */
	case VIDIOC_ENUMSTD:
	{
		struct v4l2_standard *e = arg;
		unsigned int i;

		i = e->index;
		if (i >= TVNORMS)
			return -EINVAL;
		ret = v4l2_video_std_construct(e, tvnorms[e->index].id,
						tvnorms[e->index].name);
		e->index = i;
		if (ret < 0)
			return ret;
		return 0;
	}
	case VIDIOC_G_STD:
	{
		v4l2_std_id *id = arg;

		*id = dev->tvnorm->id;
		return 0;
	}
	case VIDIOC_S_STD:
	{
		v4l2_std_id *id = arg;
		unsigned int i;

		for (i = 0; i < TVNORMS; i++)
			if (*id == tvnorms[i].id)
				break;
		if (i == TVNORMS)
			for (i = 0; i < TVNORMS; i++)
				if (*id & tvnorms[i].id)
					break;
		if (i == TVNORMS)
			return -EINVAL;

		mutex_lock(&dev->lock);
		dev->tvnorm = &tvnorms[i];

		em28xx_set_norm(dev, dev->width, dev->height);

		em28xx_i2c_call_clients(dev, DECODER_SET_NORM,
					&tvnorms[i].mode);
		em28xx_i2c_call_clients(dev, VIDIOC_S_STD,
					&dev->tvnorm->id);

		mutex_unlock(&dev->lock);

		return 0;
	}

	/* ------ input switching ---------- */
	case VIDIOC_ENUMINPUT:
	{
		struct v4l2_input *i = arg;
		unsigned int n;
		static const char *iname[] = {
			[EM28XX_VMUX_COMPOSITE1] = "Composite1",
			[EM28XX_VMUX_COMPOSITE2] = "Composite2",
			[EM28XX_VMUX_COMPOSITE3] = "Composite3",
			[EM28XX_VMUX_COMPOSITE4] = "Composite4",
			[EM28XX_VMUX_SVIDEO] = "S-Video",
			[EM28XX_VMUX_TELEVISION] = "Television",
			[EM28XX_VMUX_CABLE] = "Cable TV",
			[EM28XX_VMUX_DVB] = "DVB",
			[EM28XX_VMUX_DEBUG] = "for debug only",
		};

		n = i->index;
		if (n >= MAX_EM28XX_INPUT)
			return -EINVAL;
		if (0 == INPUT(n)->type)
			return -EINVAL;
		memset(i, 0, sizeof(*i));
		i->index = n;
		i->type = V4L2_INPUT_TYPE_CAMERA;
		strcpy(i->name, iname[INPUT(n)->type]);
		if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
			(EM28XX_VMUX_CABLE == INPUT(n)->type))
			i->type = V4L2_INPUT_TYPE_TUNER;
		for (n = 0; n < ARRAY_SIZE(tvnorms); n++)
			i->std |= tvnorms[n].id;
		return 0;
	}
	case VIDIOC_G_INPUT:
	{
		int *i = arg;
		*i = dev->ctl_input;

		return 0;
	}
	case VIDIOC_S_INPUT:
	{
		int *index = arg;

		if (*index >= MAX_EM28XX_INPUT)
			return -EINVAL;
		if (0 == INPUT(*index)->type)
			return -EINVAL;

		mutex_lock(&dev->lock);