V4L/DVB (3376): Add cpia2 camera support

There has been a CPIA2 driver out of kernel for a long time and it has
been pretty clean for some time too. This is an import of the
sourceforge driver which has been stripped of
- 2.4 back compatibility
- 2.4 old style MJPEG ioctls
A couple of functions have been made static and the docs have been
repackaged into Documentation/video4linux.  The rvmalloc/free functions now
match the cpia driver again.  Other than that this is the code as is.
Tested on x86-64 with a QX5 microscope.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 2104 insertions, 0 deletions

diff --git a/drivers/media/video/cpia2/cpia2_v4l.c b/drivers/media/video/cpia2/cpia2_v4l.c
new file mode 100644
index 000000000000..3480a2ca7cdc
--- /dev/null
+++ b/drivers/media/video/cpia2/cpia2_v4l.c
@@ -0,0 +1,2104 @@
+/****************************************************************************
+ *
+ *  Filename: cpia2_v4l.c
+ *
+ *  Copyright 2001, STMicrolectronics, Inc.
+ *      Contact:  steve.miller@st.com
+ *  Copyright 2001,2005, Scott J. Bertin <scottbertin@yahoo.com>
+ *
+ *  Description:
+ *     This is a USB driver for CPia2 based video cameras.
+ *     The infrastructure of this driver is based on the cpia usb driver by
+ *     Jochen Scharrlach and Johannes Erdfeldt.
+ *
+ *  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.
+ *
+ *  Stripped of 2.4 stuff ready for main kernel submit by
+ *		Alan Cox <alan@redhat.com>
+ ****************************************************************************/
+
+#include <linux/version.h>
+
+#include <linux/config.h>
+
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+
+#include "cpia2.h"
+#include "cpia2dev.h"
+
+
+//#define _CPIA2_DEBUG_
+
+#define MAKE_STRING_1(x)	#x
+#define MAKE_STRING(x)	MAKE_STRING_1(x)
+
+static int video_nr = -1;
+module_param(video_nr, int, 0);
+MODULE_PARM_DESC(video_nr,"video device to register (0=/dev/video0, etc)");
+
+static int buffer_size = 68*1024;
+module_param(buffer_size, int, 0);
+MODULE_PARM_DESC(buffer_size, "Size for each frame buffer in bytes (default 68k)");
+
+static int num_buffers = 3;
+module_param(num_buffers, int, 0);
+MODULE_PARM_DESC(num_buffers, "Number of frame buffers (1-"
+		 MAKE_STRING(VIDEO_MAX_FRAME) ", default 3)");
+
+static int alternate = DEFAULT_ALT;
+module_param(alternate, int, 0);
+MODULE_PARM_DESC(alternate, "USB Alternate (" MAKE_STRING(USBIF_ISO_1) "-"
+		 MAKE_STRING(USBIF_ISO_6) ", default "
+		 MAKE_STRING(DEFAULT_ALT) ")");
+
+static int flicker_freq = 60;
+module_param(flicker_freq, int, 0);
+MODULE_PARM_DESC(flicker_freq, "Flicker frequency (" MAKE_STRING(50) "or"
+		 MAKE_STRING(60) ", default "
+		 MAKE_STRING(60) ")");
+
+static int flicker_mode = NEVER_FLICKER;
+module_param(flicker_mode, int, 0);
+MODULE_PARM_DESC(flicker_mode,
+		 "Flicker supression (" MAKE_STRING(NEVER_FLICKER) "or"
+		 MAKE_STRING(ANTI_FLICKER_ON) ", default "
+		 MAKE_STRING(NEVER_FLICKER) ")");
+
+MODULE_AUTHOR("Steve Miller (STMicroelectronics) <steve.miller@st.com>");
+MODULE_DESCRIPTION("V4L-driver for STMicroelectronics CPiA2 based cameras");
+MODULE_SUPPORTED_DEVICE("video");
+MODULE_LICENSE("GPL");
+
+#define ABOUT "V4L-Driver for Vision CPiA2 based cameras"
+
+#ifndef VID_HARDWARE_CPIA2
+#error "VID_HARDWARE_CPIA2 should have been defined in linux/videodev.h"
+#endif
+
+struct control_menu_info {
+	int value;
+	char name[32];
+};
+
+static struct control_menu_info framerate_controls[] =
+{
+	{ CPIA2_VP_FRAMERATE_6_25, "6.25 fps" },
+	{ CPIA2_VP_FRAMERATE_7_5,  "7.5 fps"  },
+	{ CPIA2_VP_FRAMERATE_12_5, "12.5 fps" },
+	{ CPIA2_VP_FRAMERATE_15,   "15 fps"   },
+	{ CPIA2_VP_FRAMERATE_25,   "25 fps"   },
+	{ CPIA2_VP_FRAMERATE_30,   "30 fps"   },
+};
+#define NUM_FRAMERATE_CONTROLS (sizeof(framerate_controls)/sizeof(framerate_controls[0]))
+
+static struct control_menu_info flicker_controls[] =
+{
+	{ NEVER_FLICKER, "Off" },
+	{ FLICKER_50,    "50 Hz" },
+	{ FLICKER_60,    "60 Hz"  },
+};
+#define NUM_FLICKER_CONTROLS (sizeof(flicker_controls)/sizeof(flicker_controls[0]))
+
+static struct control_menu_info lights_controls[] =
+{
+	{ 0,   "Off" },
+	{ 64,  "Top" },
+	{ 128, "Bottom"  },
+	{ 192, "Both"  },
+};
+#define NUM_LIGHTS_CONTROLS (sizeof(lights_controls)/sizeof(lights_controls[0]))
+#define GPIO_LIGHTS_MASK 192
+
+static struct v4l2_queryctrl controls[] = {
+	{
+		.id            = V4L2_CID_BRIGHTNESS,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+		.name          = "Brightness",
+		.minimum       = 0,
+		.maximum       = 255,
+		.step          = 1,
+		.default_value = DEFAULT_BRIGHTNESS,
+	},
+	{
+		.id            = V4L2_CID_CONTRAST,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+		.name          = "Contrast",
+		.minimum       = 0,
+		.maximum       = 255,
+		.step          = 1,
+		.default_value = DEFAULT_CONTRAST,
+	},
+	{
+		.id            = V4L2_CID_SATURATION,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+		.name          = "Saturation",
+		.minimum       = 0,
+		.maximum       = 255,
+		.step          = 1,
+		.default_value = DEFAULT_SATURATION,
+	},
+	{
+		.id            = V4L2_CID_HFLIP,
+		.type          = V4L2_CTRL_TYPE_BOOLEAN,
+		.name          = "Mirror Horizontally",
+		.minimum       = 0,
+		.maximum       = 1,
+		.step          = 1,
+		.default_value = 0,
+	},
+	{
+		.id            = V4L2_CID_VFLIP,
+		.type          = V4L2_CTRL_TYPE_BOOLEAN,
+		.name          = "Flip Vertically",
+		.minimum       = 0,
+		.maximum       = 1,
+		.step          = 1,
+		.default_value = 0,
+	},
+	{
+		.id            = CPIA2_CID_TARGET_KB,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+		.name          = "Target KB",
+		.minimum       = 0,
+		.maximum       = 255,
+		.step          = 1,
+		.default_value = DEFAULT_TARGET_KB,
+	},
+	{
+		.id            = CPIA2_CID_GPIO,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+		.name          = "GPIO",
+		.minimum       = 0,
+		.maximum       = 255,
+		.step          = 1,
+		.default_value = 0,
+	},
+	{
+		.id            = CPIA2_CID_FLICKER_MODE,
+		.type          = V4L2_CTRL_TYPE_MENU,
+		.name          = "Flicker Reduction",
+		.minimum       = 0,
+		.maximum       = NUM_FLICKER_CONTROLS-1,
+		.step          = 1,
+		.default_value = 0,
+	},
+	{
+		.id            = CPIA2_CID_FRAMERATE,
+		.type          = V4L2_CTRL_TYPE_MENU,
+		.name          = "Framerate",
+		.minimum       = 0,
+		.maximum       = NUM_FRAMERATE_CONTROLS-1,
+		.step          = 1,
+		.default_value = NUM_FRAMERATE_CONTROLS-1,
+	},
+	{
+		.id            = CPIA2_CID_USB_ALT,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+		.name          = "USB Alternate",
+		.minimum       = USBIF_ISO_1,
+		.maximum       = USBIF_ISO_6,
+		.step          = 1,
+		.default_value = DEFAULT_ALT,
+	},
+	{
+		.id            = CPIA2_CID_LIGHTS,
+		.type          = V4L2_CTRL_TYPE_MENU,
+		.name          = "Lights",
+		.minimum       = 0,
+		.maximum       = NUM_LIGHTS_CONTROLS-1,
+		.step          = 1,
+		.default_value = 0,
+	},
+	{
+		.id            = CPIA2_CID_RESET_CAMERA,
+		.type          = V4L2_CTRL_TYPE_BUTTON,
+		.name          = "Reset Camera",
+		.minimum       = 0,
+		.maximum       = 0,
+		.step          = 0,
+		.default_value = 0,
+	},
+};
+#define NUM_CONTROLS (sizeof(controls)/sizeof(controls[0]))
+
+
+/******************************************************************************
+ *
+ *  cpia2_open
+ *
+ *****************************************************************************/
+static int cpia2_open(struct inode *inode, struct file *file)
+{
+	struct video_device *dev = video_devdata(file);
+	struct camera_data *cam = video_get_drvdata(dev);
+	int retval = 0;
+
+	if (!cam) {
+		ERR("Internal error, camera_data not found!\n");
+		return -ENODEV;
+	}
+
+	if(down_interruptible(&cam->busy_lock))
+		return -ERESTARTSYS;
+
+	if(!cam->present) {
+		retval = -ENODEV;
+		goto err_return;
+	}
+
+	if (cam->open_count > 0) {
+		goto skip_init;
+	}
+
+	if (cpia2_allocate_buffers(cam)) {
+		retval = -ENOMEM;
+		goto err_return;
+	}
+
+	/* reset the camera */
+	if (cpia2_reset_camera(cam) < 0) {
+		retval = -EIO;
+		goto err_return;
+	}
+
+	cam->APP_len = 0;
+	cam->COM_len = 0;
+
+skip_init:
+	{
+		struct cpia2_fh *fh = kmalloc(sizeof(*fh),GFP_KERNEL);
+		if(!fh) {
+			retval = -ENOMEM;
+			goto err_return;
+		}
+		file->private_data = fh;
+		fh->prio = V4L2_PRIORITY_UNSET;
+		v4l2_prio_open(&cam->prio, &fh->prio);
+		fh->mmapped = 0;
+	}
+
+	++cam->open_count;
+
+	cpia2_dbg_dump_registers(cam);
+
+err_return:
+	up(&cam->busy_lock);
+	return retval;
+}
+
+/******************************************************************************
+ *
+ *  cpia2_close
+ *
+ *****************************************************************************/
+static int cpia2_close(struct inode *inode, struct file *file)
+{
+	struct video_device *dev = video_devdata(file);
+	struct camera_data *cam = video_get_drvdata(dev);
+	struct cpia2_fh *fh = file->private_data;
+
+	down(&cam->busy_lock);
+
+	if (cam->present &&
+	    (cam->open_count == 1
+	     || fh->prio == V4L2_PRIORITY_RECORD
+	    )) {
+		cpia2_usb_stream_stop(cam);
+
+		if(cam->open_count == 1) {
+			/* save camera state for later open */
+			cpia2_save_camera_state(cam);
+
+			cpia2_set_low_power(cam);
+			cpia2_free_buffers(cam);
+		}
+	}
+
+	{
+		if(fh->mmapped)
+			cam->mmapped = 0;
+		v4l2_prio_close(&cam->prio,&fh->prio);
+		file->private_data = NULL;
+		kfree(fh);
+	}
+
+	if (--cam->open_count == 0) {
+		cpia2_free_buffers(cam);
+		if (!cam->present) {
+			video_unregister_device(dev);
+			kfree(cam);
+		}
+	}
+
+	up(&cam->busy_lock);
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  cpia2_v4l_read
+ *
+ *****************************************************************************/
+static ssize_t cpia2_v4l_read(struct file *file, char __user *buf, size_t count,
+			      loff_t *off)
+{
+	struct video_device *dev = video_devdata(file);
+	struct camera_data *cam = video_get_drvdata(dev);
+	int noblock = file->f_flags&O_NONBLOCK;
+
+	struct cpia2_fh *fh = file->private_data;
+
+	if(!cam)
+		return -EINVAL;
+
+	/* Priority check */
+	if(fh->prio != V4L2_PRIORITY_RECORD) {
+		return -EBUSY;
+	}
+
+	return cpia2_read(cam, buf, count, noblock);
+}
+
+
+/******************************************************************************
+ *
+ *  cpia2_v4l_poll
+ *
+ *****************************************************************************/
+static unsigned int cpia2_v4l_poll(struct file *filp, struct poll_table_struct *wait)
+{
+	struct video_device *dev = video_devdata(filp);
+	struct camera_data *cam = video_get_drvdata(dev);
+
+	struct cpia2_fh *fh = filp->private_data;
+
+	if(!cam)
+		return POLLERR;
+
+	/* Priority check */
+	if(fh->prio != V4L2_PRIORITY_RECORD) {
+		return POLLERR;
+	}
+
+	return cpia2_poll(cam, filp, wait);
+}
+
+
+/******************************************************************************
+ *
+ *  ioctl_cap_query
+ *
+ *****************************************************************************/
+static int ioctl_cap_query(void *arg, struct camera_data *cam)
+{
+	struct video_capability *vc;
+	int retval = 0;
+	vc = arg;
+
+	if (cam->params.pnp_id.product == 0x151)
+		strcpy(vc->name, "QX5 Microscope");
+	else
+		strcpy(vc->name, "CPiA2 Camera");
+
+	vc->type = VID_TYPE_CAPTURE | VID_TYPE_MJPEG_ENCODER;
+	vc->channels = 1;
+	vc->audios = 0;
+	vc->minwidth = 176;	/* VIDEOSIZE_QCIF */
+	vc->minheight = 144;
+	switch (cam->params.version.sensor_flags) {
+	case CPIA2_VP_SENSOR_FLAGS_500:
+		vc->maxwidth = STV_IMAGE_VGA_COLS;
+		vc->maxheight = STV_IMAGE_VGA_ROWS;
+		break;
+	case CPIA2_VP_SENSOR_FLAGS_410:
+		vc->maxwidth = STV_IMAGE_CIF_COLS;
+		vc->maxheight = STV_IMAGE_CIF_ROWS;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return retval;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_get_channel
+ *
+ *****************************************************************************/
+static int ioctl_get_channel(void *arg)
+{
+	int retval = 0;
+	struct video_channel *v;
+	v = arg;
+
+	if (v->channel != 0)
+		return -EINVAL;
+
+	v->channel = 0;
+	strcpy(v->name, "Camera");
+	v->tuners = 0;
+	v->flags = 0;
+	v->type = VIDEO_TYPE_CAMERA;
+	v->norm = 0;
+
+	return retval;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_set_channel
+ *
+ *****************************************************************************/
+static int ioctl_set_channel(void *arg)
+{
+	struct video_channel *v;
+	int retval = 0;
+	v = arg;
+
+	if (retval == 0 && v->channel != 0)
+		retval = -EINVAL;
+
+	return retval;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_set_image_prop
+ *
+ *****************************************************************************/
+static int ioctl_set_image_prop(void *arg, struct camera_data *cam)
+{
+	struct video_picture *vp;
+	int retval = 0;
+	vp = arg;
+
+	/* brightness, color, contrast need no check 0-65535 */
+	memcpy(&cam->vp, vp, sizeof(*vp));
+
+	/* update cam->params.colorParams */
+	cam->params.color_params.brightness = vp->brightness / 256;
+	cam->params.color_params.saturation = vp->colour / 256;
+	cam->params.color_params.contrast = vp->contrast / 256;
+
+	DBG("Requested params: bright 0x%X, sat 0x%X, contrast 0x%X\n",
+	    cam->params.color_params.brightness,
+	    cam->params.color_params.saturation,
+	    cam->params.color_params.contrast);
+
+	cpia2_set_color_params(cam);
+
+	return retval;
+}
+
+static int sync(struct camera_data *cam, int frame_nr)
+{
+	struct framebuf *frame = &cam->buffers[frame_nr];
+
+	while (1) {
+		if (frame->status == FRAME_READY)
+			return 0;
+
+		if (!cam->streaming) {
+			frame->status = FRAME_READY;
+			frame->length = 0;
+			return 0;
+		}
+
+		up(&cam->busy_lock);
+		wait_event_interruptible(cam->wq_stream,
+					 !cam->streaming ||
+					 frame->status == FRAME_READY);
+		down(&cam->busy_lock);
+		if (signal_pending(current))
+			return -ERESTARTSYS;
+		if(!cam->present)
+			return -ENOTTY;
+	}
+}
+
+/******************************************************************************
+ *
+ *  ioctl_set_window_size
+ *
+ *****************************************************************************/
+static int ioctl_set_window_size(void *arg, struct camera_data *cam,
+				 struct cpia2_fh *fh)
+{
+	/* copy_from_user, check validity, copy to internal structure */
+	struct video_window *vw;
+	int frame, err;
+	vw = arg;
+
+	if (vw->clipcount != 0)	/* clipping not supported */
+		return -EINVAL;
+
+	if (vw->clips != NULL)	/* clipping not supported */
+		return -EINVAL;
+
+	/* Ensure that only this process can change the format. */
+	err = v4l2_prio_change(&cam->prio, &fh->prio, V4L2_PRIORITY_RECORD);
+	if(err != 0)
+		return err;
+
+	cam->pixelformat = V4L2_PIX_FMT_JPEG;
+
+	/* Be sure to supply the Huffman tables, this isn't MJPEG */
+	cam->params.compression.inhibit_htables = 0;
+
+	/* we set the video window to something smaller or equal to what
+	 * is requested by the user???
+	 */
+	DBG("Requested width = %d, height = %d\n", vw->width, vw->height);
+	if (vw->width != cam->vw.width || vw->height != cam->vw.height) {
+		cam->vw.width = vw->width;
+		cam->vw.height = vw->height;
+		cam->params.roi.width = vw->width;
+		cam->params.roi.height = vw->height;
+		cpia2_set_format(cam);
+	}
+
+	for (frame = 0; frame < cam->num_frames; ++frame) {
+		if (cam->buffers[frame].status == FRAME_READING)
+			if ((err = sync(cam, frame)) < 0)
+				return err;
+
+		cam->buffers[frame].status = FRAME_EMPTY;
+	}
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_get_mbuf
+ *
+ *****************************************************************************/
+static int ioctl_get_mbuf(void *arg, struct camera_data *cam)
+{
+	struct video_mbuf *vm;
+	int i;
+	vm = arg;
+
+	memset(vm, 0, sizeof(*vm));
+	vm->size = cam->frame_size*cam->num_frames;
+	vm->frames = cam->num_frames;
+	for (i = 0; i < cam->num_frames; i++)
+		vm->offsets[i] = cam->frame_size * i;
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_mcapture
+ *
+ *****************************************************************************/
+static int ioctl_mcapture(void *arg, struct camera_data *cam,
+			  struct cpia2_fh *fh)
+{
+	struct video_mmap *vm;
+	int video_size, err;
+	vm = arg;
+
+	if (vm->frame < 0 || vm->frame >= cam->num_frames)
+		return -EINVAL;
+
+	/* set video size */
+	video_size = cpia2_match_video_size(vm->width, vm->height);
+	if (cam->video_size < 0) {
+		return -EINVAL;
+	}
+
+	/* Ensure that only this process can change the format. */
+	err = v4l2_prio_change(&cam->prio, &fh->prio, V4L2_PRIORITY_RECORD);
+	if(err != 0)
+		return err;
+
+	if (video_size != cam->video_size) {
+		cam->video_size = video_size;
+		cam->params.roi.width = vm->width;
+		cam->params.roi.height = vm->height;
+		cpia2_set_format(cam);
+	}
+
+	if (cam->buffers[vm->frame].status == FRAME_READING)
+		if ((err=sync(cam, vm->frame)) < 0)
+			return err;
+
+	cam->buffers[vm->frame].status = FRAME_EMPTY;
+
+	return cpia2_usb_stream_start(cam,cam->params.camera_state.stream_mode);
+}
+
+/******************************************************************************
+ *
+ *  ioctl_sync
+ *
+ *****************************************************************************/
+static int ioctl_sync(void *arg, struct camera_data *cam)
+{
+	int frame;
+
+	frame = *(int*)arg;
+
+	if (frame < 0 || frame >= cam->num_frames)
+		return -EINVAL;
+
+	return sync(cam, frame);
+}
+
+
+/******************************************************************************
+ *
+ *  ioctl_set_gpio
+ *
+ *****************************************************************************/
+
+static int ioctl_set_gpio(void *arg, struct camera_data *cam)
+{
+	__u32 gpio_val;
+
+	gpio_val = *(__u32*) arg;
+
+	if (gpio_val &~ 0xFFU)
+		return -EINVAL;
+
+	return cpia2_set_gpio(cam, (unsigned char)gpio_val);
+}
+
+/******************************************************************************
+ *
+ *  ioctl_querycap
+ *
+ *  V4L2 device capabilities
+ *
+ *****************************************************************************/
+
+static int ioctl_querycap(void *arg, struct camera_data *cam)
+{
+	struct v4l2_capability *vc = arg;
+
+	memset(vc, 0, sizeof(*vc));
+	strcpy(vc->driver, "cpia2");
+
+	if (cam->params.pnp_id.product == 0x151)
+		strcpy(vc->card, "QX5 Microscope");
+	else
+		strcpy(vc->card, "CPiA2 Camera");
+	switch (cam->params.pnp_id.device_type) {
+	case DEVICE_STV_672:
+		strcat(vc->card, " (672/");
+		break;
+	case DEVICE_STV_676:
+		strcat(vc->card, " (676/");
+		break;
+	default:
+		strcat(vc->card, " (???/");
+		break;
+	}
+	switch (cam->params.version.sensor_flags) {
+	case CPIA2_VP_SENSOR_FLAGS_404:
+		strcat(vc->card, "404)");
+		break;
+	case CPIA2_VP_SENSOR_FLAGS_407:
+		strcat(vc->card, "407)");
+		break;
+	case CPIA2_VP_SENSOR_FLAGS_409:
+		strcat(vc->card, "409)");
+		break;
+	case CPIA2_VP_SENSOR_FLAGS_410:
+		strcat(vc->card, "410)");
+		break;
+	case CPIA2_VP_SENSOR_FLAGS_500:
+		strcat(vc->card, "500)");
+		break;
+	default:
+		strcat(vc->card, "???)");
+		break;
+	}
+
+	if (usb_make_path(cam->dev, vc->bus_info, sizeof(vc->bus_info)) <0)
+		memset(vc->bus_info,0, sizeof(vc->bus_info));
+
+	vc->version = KERNEL_VERSION(CPIA2_MAJ_VER, CPIA2_MIN_VER,
+				     CPIA2_PATCH_VER);
+
+	vc->capabilities = V4L2_CAP_VIDEO_CAPTURE |
+			   V4L2_CAP_READWRITE |
+			   V4L2_CAP_STREAMING;
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_input
+ *
+ *  V4L2 input get/set/enumerate
+ *
+ *****************************************************************************/
+
+static int ioctl_input(unsigned int ioclt_nr,void *arg,struct camera_data *cam)
+{
+	struct v4l2_input *i = arg;
+
+	if(ioclt_nr  != VIDIOC_G_INPUT) {
+		if (i->index != 0)
+		       return -EINVAL;
+	}
+
+	memset(i, 0, sizeof(*i));
+	strcpy(i->name, "Camera");
+	i->type = V4L2_INPUT_TYPE_CAMERA;
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_enum_fmt
+ *
+ *  V4L2 format enumerate
+ *
+ *****************************************************************************/
+
+static int ioctl_enum_fmt(void *arg,struct camera_data *cam)
+{
+	struct v4l2_fmtdesc *f = arg;
+	int index = f->index;
+
+	if (index < 0 || index > 1)
+	       return -EINVAL;
+
+	memset(f, 0, sizeof(*f));
+	f->index = index;
+	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	f->flags = V4L2_FMT_FLAG_COMPRESSED;
+	switch(index) {
+	case 0:
+		strcpy(f->description, "MJPEG");
+		f->pixelformat = V4L2_PIX_FMT_MJPEG;
+		break;
+	case 1:
+		strcpy(f->description, "JPEG");
+		f->pixelformat = V4L2_PIX_FMT_JPEG;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_try_fmt
+ *
+ *  V4L2 format try
+ *
+ *****************************************************************************/
+
+static int ioctl_try_fmt(void *arg,struct camera_data *cam)
+{
+	struct v4l2_format *f = arg;
+
+	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+	       return -EINVAL;
+
+	if (f->fmt.pix.pixelformat != V4L2_PIX_FMT_MJPEG &&
+	    f->fmt.pix.pixelformat != V4L2_PIX_FMT_JPEG)
+	       return -EINVAL;
+
+	f->fmt.pix.field = V4L2_FIELD_NONE;
+	f->fmt.pix.bytesperline = 0;
+	f->fmt.pix.sizeimage = cam->frame_size;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_JPEG;
+	f->fmt.pix.priv = 0;
+
+	switch (cpia2_match_video_size(f->fmt.pix.width, f->fmt.pix.height)) {
+	case VIDEOSIZE_VGA:
+		f->fmt.pix.width = 640;
+		f->fmt.pix.height = 480;
+		break;
+	case VIDEOSIZE_CIF:
+		f->fmt.pix.width = 352;
+		f->fmt.pix.height = 288;
+		break;
+	case VIDEOSIZE_QVGA:
+		f->fmt.pix.width = 320;
+		f->fmt.pix.height = 240;
+		break;
+	case VIDEOSIZE_288_216:
+		f->fmt.pix.width = 288;
+		f->fmt.pix.height = 216;
+		break;
+	case VIDEOSIZE_256_192:
+		f->fmt.pix.width = 256;
+		f->fmt.pix.height = 192;
+		break;
+	case VIDEOSIZE_224_168:
+		f->fmt.pix.width = 224;
+		f->fmt.pix.height = 168;
+		break;
+	case VIDEOSIZE_192_144:
+		f->fmt.pix.width = 192;
+		f->fmt.pix.height = 144;
+		break;
+	case VIDEOSIZE_QCIF:
+	default:
+		f->fmt.pix.width = 176;
+		f->fmt.pix.height = 144;
+		break;
+	}
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_set_fmt
+ *
+ *  V4L2 format set
+ *
+ *****************************************************************************/
+
+static int ioctl_set_fmt(void *arg,struct camera_data *cam, struct cpia2_fh *fh)
+{
+	struct v4l2_format *f = arg;
+	int err, frame;
+
+	err = ioctl_try_fmt(arg, cam);
+	if(err != 0)
+		return err;
+
+	/* Ensure that only this process can change the format. */
+	err = v4l2_prio_change(&cam->prio, &fh->prio, V4L2_PRIORITY_RECORD);
+	if(err != 0) {
+		return err;
+	}
+
+	cam->pixelformat = f->fmt.pix.pixelformat;
+
+	/* NOTE: This should be set to 1 for MJPEG, but some apps don't handle
+	 * the missing Huffman table properly. */
+	cam->params.compression.inhibit_htables = 0;
+		/*f->fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG;*/
+
+	/* we set the video window to something smaller or equal to what
+	 * is requested by the user???
+	 */
+	DBG("Requested width = %d, height = %d\n",
+	    f->fmt.pix.width, f->fmt.pix.height);
+	if (f->fmt.pix.width != cam->vw.width ||
+	    f->fmt.pix.height != cam->vw.height) {
+		cam->vw.width = f->fmt.pix.width;
+		cam->vw.height = f->fmt.pix.height;
+		cam->params.roi.width = f->fmt.pix.width;
+		cam->params.roi.height = f->fmt.pix.height;
+		cpia2_set_format(cam);
+	}
+
+	for (frame = 0; frame < cam->num_frames; ++frame) {
+		if (cam->buffers[frame].status == FRAME_READING)
+			if ((err = sync(cam, frame)) < 0)
+				return err;
+
+		cam->buffers[frame].status = FRAME_EMPTY;
+	}
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_get_fmt
+ *
+ *  V4L2 format get
+ *
+ *****************************************************************************/
+
+static int ioctl_get_fmt(void *arg,struct camera_data *cam)
+{
+	struct v4l2_format *f = arg;
+
+	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+	       return -EINVAL;
+
+	f->fmt.pix.width = cam->vw.width;
+	f->fmt.pix.height = cam->vw.height;
+	f->fmt.pix.pixelformat = cam->pixelformat;
+	f->fmt.pix.field = V4L2_FIELD_NONE;
+	f->fmt.pix.bytesperline = 0;
+	f->fmt.pix.sizeimage = cam->frame_size;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_JPEG;
+	f->fmt.pix.priv = 0;
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_cropcap
+ *
+ *  V4L2 query cropping capabilities
+ *  NOTE: cropping is currently disabled
+ *
+ *****************************************************************************/
+
+static int ioctl_cropcap(void *arg,struct camera_data *cam)
+{
+	struct v4l2_cropcap *c = arg;
+
+	if (c->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+	       return -EINVAL;
+
+	c->bounds.left = 0;
+	c->bounds.top = 0;
+	c->bounds.width = cam->vw.width;
+	c->bounds.height = cam->vw.height;
+	c->defrect.left = 0;
+	c->defrect.top = 0;
+	c->defrect.width = cam->vw.width;
+	c->defrect.height = cam->vw.height;
+	c->pixelaspect.numerator = 1;
+	c->pixelaspect.denominator = 1;
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_queryctrl
+ *
+ *  V4L2 query possible control variables
+ *
+ *****************************************************************************/
+
+static int ioctl_queryctrl(void *arg,struct camera_data *cam)
+{
+	struct v4l2_queryctrl *c = arg;
+	int i;
+
+	for(i=0; i<NUM_CONTROLS; ++i) {
+		if(c->id == controls[i].id) {
+			memcpy(c, controls+i, sizeof(*c));
+			break;
+		}
+	}
+
+	if(i == NUM_CONTROLS)
+		return -EINVAL;
+
+	/* Some devices have additional limitations */
+	switch(c->id) {
+	case V4L2_CID_BRIGHTNESS:
+		/***
+		 * Don't let the register be set to zero - bug in VP4
+		 * flash of full brightness
+		 ***/
+		if (cam->params.pnp_id.device_type == DEVICE_STV_672)
+			c->minimum = 1;
+		break;
+	case V4L2_CID_VFLIP:
+		// VP5 Only
+		if(cam->params.pnp_id.device_type == DEVICE_STV_672)
+			c->flags |= V4L2_CTRL_FLAG_DISABLED;
+		break;
+	case CPIA2_CID_FRAMERATE:
+		if(cam->params.pnp_id.device_type == DEVICE_STV_672 &&
+		   cam->params.version.sensor_flags==CPIA2_VP_SENSOR_FLAGS_500){
+			// Maximum 15fps
+			int i;
+			for(i=0; i<c->maximum; ++i) {
+				if(framerate_controls[i].value ==
+				   CPIA2_VP_FRAMERATE_15) {
+					c->maximum = i;
+					c->default_value = i;
+				}
+			}
+		}
+		break;
+	case CPIA2_CID_FLICKER_MODE:
+		// Flicker control only valid for 672.
+		if(cam->params.pnp_id.device_type != DEVICE_STV_672)
+			c->flags |= V4L2_CTRL_FLAG_DISABLED;
+		break;
+	case CPIA2_CID_LIGHTS:
+		// Light control only valid for the QX5 Microscope.
+		if(cam->params.pnp_id.product != 0x151)
+			c->flags |= V4L2_CTRL_FLAG_DISABLED;
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_querymenu
+ *
+ *  V4L2 query possible control variables
+ *
+ *****************************************************************************/
+
+static int ioctl_querymenu(void *arg,struct camera_data *cam)
+{
+	struct v4l2_querymenu *m = arg;
+
+	memset(m->name, 0, sizeof(m->name));
+	m->reserved = 0;
+
+	switch(m->id) {
+	case CPIA2_CID_FLICKER_MODE:
+		if(m->index < 0 || m->index >= NUM_FLICKER_CONTROLS)
+			return -EINVAL;
+
+		strcpy(m->name, flicker_controls[m->index].name);
+		break;
+	case CPIA2_CID_FRAMERATE:
+	    {
+		int maximum = NUM_FRAMERATE_CONTROLS - 1;
+		if(cam->params.pnp_id.device_type == DEVICE_STV_672 &&
+		   cam->params.version.sensor_flags==CPIA2_VP_SENSOR_FLAGS_500){
+			// Maximum 15fps
+			int i;
+			for(i=0; i<maximum; ++i) {
+				if(framerate_controls[i].value ==
+				   CPIA2_VP_FRAMERATE_15)
+					maximum = i;
+			}
+		}
+		if(m->index < 0 || m->index > maximum)
+			return -EINVAL;
+
+		strcpy(m->name, framerate_controls[m->index].name);
+		break;
+	    }
+	case CPIA2_CID_LIGHTS:
+		if(m->index < 0 || m->index >= NUM_LIGHTS_CONTROLS)
+			return -EINVAL;
+
+		strcpy(m->name, lights_controls[m->index].name);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_g_ctrl
+ *
+ *  V4L2 get the value of a control variable
+ *
+ *****************************************************************************/
+
+static int ioctl_g_ctrl(void *arg,struct camera_data *cam)
+{
+	struct v4l2_control *c = arg;
+
+	switch(c->id) {
+	case V4L2_CID_BRIGHTNESS:
+		cpia2_do_command(cam, CPIA2_CMD_GET_VP_BRIGHTNESS,
+				 TRANSFER_READ, 0);
+		c->value = cam->params.color_params.brightness;
+		break;
+	case V4L2_CID_CONTRAST:
+		cpia2_do_command(cam, CPIA2_CMD_GET_CONTRAST,
+				 TRANSFER_READ, 0);
+		c->value = cam->params.color_params.contrast;
+		break;
+	case V4L2_CID_SATURATION:
+		cpia2_do_command(cam, CPIA2_CMD_GET_VP_SATURATION,
+				 TRANSFER_READ, 0);
+		c->value = cam->params.color_params.saturation;
+		break;
+	case V4L2_CID_HFLIP:
+		cpia2_do_command(cam, CPIA2_CMD_GET_USER_EFFECTS,
+				 TRANSFER_READ, 0);
+		c->value = (cam->params.vp_params.user_effects &
+			    CPIA2_VP_USER_EFFECTS_MIRROR) != 0;
+		break;
+	case V4L2_CID_VFLIP:
+		cpia2_do_command(cam, CPIA2_CMD_GET_USER_EFFECTS,
+				 TRANSFER_READ, 0);
+		c->value = (cam->params.vp_params.user_effects &
+			    CPIA2_VP_USER_EFFECTS_FLIP) != 0;
+		break;
+	case CPIA2_CID_TARGET_KB:
+		c->value = cam->params.vc_params.target_kb;
+		break;
+	case CPIA2_CID_GPIO:
+		cpia2_do_command(cam, CPIA2_CMD_GET_VP_GPIO_DATA,
+				 TRANSFER_READ, 0);
+		c->value = cam->params.vp_params.gpio_data;
+		break;
+	case CPIA2_CID_FLICKER_MODE:
+	{
+		int i, mode;
+		cpia2_do_command(cam, CPIA2_CMD_GET_FLICKER_MODES,
+				 TRANSFER_READ, 0);
+		if(cam->params.flicker_control.cam_register &
+		   CPIA2_VP_FLICKER_MODES_NEVER_FLICKER) {
+			mode = NEVER_FLICKER;
+		} else {
+		    if(cam->params.flicker_control.cam_register &
+		       CPIA2_VP_FLICKER_MODES_50HZ) {
+		    	mode = FLICKER_50;
+		    } else {
+		    	mode = FLICKER_60;
+		    }
+		}
+		for(i=0; i<NUM_FLICKER_CONTROLS; i++) {
+			if(flicker_controls[i].value == mode) {
+				c->value = i;
+				break;
+			}
+		}
+		if(i == NUM_FLICKER_CONTROLS)
+			return -EINVAL;
+		break;
+	}
+	case CPIA2_CID_FRAMERATE:
+	{
+		int maximum = NUM_FRAMERATE_CONTROLS - 1;
+		int i;
+		for(i=0; i<= maximum; i++) {
+			if(cam->params.vp_params.frame_rate ==
+			   framerate_controls[i].value)
+				break;
+		}
+		if(i > maximum)
+			return -EINVAL;
+		c->value = i;
+		break;
+	}
+	case CPIA2_CID_USB_ALT:
+		c->value = cam->params.camera_state.stream_mode;
+		break;
+	case CPIA2_CID_LIGHTS:
+	{
+		int i;
+		cpia2_do_command(cam, CPIA2_CMD_GET_VP_GPIO_DATA,
+				 TRANSFER_READ, 0);
+		for(i=0; i<NUM_LIGHTS_CONTROLS; i++) {
+			if((cam->params.vp_params.gpio_data&GPIO_LIGHTS_MASK) ==
+			   lights_controls[i].value) {
+				break;
+			}
+		}
+		if(i == NUM_LIGHTS_CONTROLS)
+			return -EINVAL;
+		c->value = i;
+		break;
+	}
+	case CPIA2_CID_RESET_CAMERA:
+		return -EINVAL;
+	default:
+		return -EINVAL;
+	}
+
+	DBG("Get control id:%d, value:%d\n", c->id, c->value);
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_s_ctrl
+ *
+ *  V4L2 set the value of a control variable
+ *
+ *****************************************************************************/
+
+static int ioctl_s_ctrl(void *arg,struct camera_data *cam)
+{
+	struct v4l2_control *c = arg;
+	int i;
+	int retval = 0;
+
+	DBG("Set control id:%d, value:%d\n", c->id, c->value);
+
+	/* Check that the value is in range */
+	for(i=0; i<NUM_CONTROLS; i++) {
+		if(c->id == controls[i].id) {
+			if(c->value < controls[i].minimum ||
+			   c->value > controls[i].maximum) {
+				return -EINVAL;
+			}
+			break;
+		}
+	}
+	if(i == NUM_CONTROLS)
+		return -EINVAL;
+
+	switch(c->id) {
+	case V4L2_CID_BRIGHTNESS:
+		cpia2_set_brightness(cam, c->value);
+		break;
+	case V4L2_CID_CONTRAST:
+		cpia2_set_contrast(cam, c->value);
+		break;
+	case V4L2_CID_SATURATION:
+		cpia2_set_saturation(cam, c->value);
+		break;
+	case V4L2_CID_HFLIP:
+		cpia2_set_property_mirror(cam, c->value);
+		break;
+	case V4L2_CID_VFLIP:
+		cpia2_set_property_flip(cam, c->value);
+		break;
+	case CPIA2_CID_TARGET_KB:
+		retval = cpia2_set_target_kb(cam, c->value);
+		break;
+	case CPIA2_CID_GPIO:
+		retval = cpia2_set_gpio(cam, c->value);
+		break;
+	case CPIA2_CID_FLICKER_MODE:
+		retval = cpia2_set_flicker_mode(cam,
+					      flicker_controls[c->value].value);
+		break;
+	case CPIA2_CID_FRAMERATE:
+		retval = cpia2_set_fps(cam, framerate_controls[c->value].value);
+		break;
+	case CPIA2_CID_USB_ALT:
+		retval = cpia2_usb_change_streaming_alternate(cam, c->value);
+		break;
+	case CPIA2_CID_LIGHTS:
+		retval = cpia2_set_gpio(cam, lights_controls[c->value].value);
+		break;
+	case CPIA2_CID_RESET_CAMERA:
+		cpia2_usb_stream_pause(cam);
+		cpia2_reset_camera(cam);
+		cpia2_usb_stream_resume(cam);
+		break;
+	default:
+		retval = -EINVAL;
+	}
+
+	return retval;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_g_jpegcomp
+ *
+ *  V4L2 get the JPEG compression parameters
+ *
+ *****************************************************************************/
+
+static int ioctl_g_jpegcomp(void *arg,struct camera_data *cam)
+{
+	struct v4l2_jpegcompression *parms = arg;
+
+	memset(parms, 0, sizeof(*parms));
+
+	parms->quality = 80; // TODO: Can this be made meaningful?
+
+	parms->jpeg_markers = V4L2_JPEG_MARKER_DQT | V4L2_JPEG_MARKER_DRI;
+	if(!cam->params.compression.inhibit_htables) {
+		parms->jpeg_markers |= V4L2_JPEG_MARKER_DHT;
+	}
+
+	parms->APPn = cam->APPn;
+	parms->APP_len = cam->APP_len;
+	if(cam->APP_len > 0) {
+		memcpy(parms->APP_data, cam->APP_data, cam->APP_len);
+		parms->jpeg_markers |= V4L2_JPEG_MARKER_APP;
+	}
+
+	parms->COM_len = cam->COM_len;
+	if(cam->COM_len > 0) {
+		memcpy(parms->COM_data, cam->COM_data, cam->COM_len);
+		parms->jpeg_markers |= JPEG_MARKER_COM;
+	}
+
+	DBG("G_JPEGCOMP APP_len:%d COM_len:%d\n",
+	    parms->APP_len, parms->COM_len);
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_s_jpegcomp
+ *
+ *  V4L2 set the JPEG compression parameters
+ *  NOTE: quality and some jpeg_markers are ignored.
+ *
+ *****************************************************************************/
+
+static int ioctl_s_jpegcomp(void *arg,struct camera_data *cam)
+{
+	struct v4l2_jpegcompression *parms = arg;
+
+	DBG("S_JPEGCOMP APP_len:%d COM_len:%d\n",
+	    parms->APP_len, parms->COM_len);
+
+	cam->params.compression.inhibit_htables =
+		!(parms->jpeg_markers & V4L2_JPEG_MARKER_DHT);
+
+	if(parms->APP_len != 0) {
+		if(parms->APP_len > 0 &&
+		   parms->APP_len <= sizeof(cam->APP_data) &&
+		   parms->APPn >= 0 && parms->APPn <= 15) {
+			cam->APPn = parms->APPn;
+			cam->APP_len = parms->APP_len;
+			memcpy(cam->APP_data, parms->APP_data, parms->APP_len);
+		} else {
+			LOG("Bad APPn Params n=%d len=%d\n",
+			    parms->APPn, parms->APP_len);
+			return -EINVAL;
+		}
+	} else {
+		cam->APP_len = 0;
+	}
+
+	if(parms->COM_len != 0) {
+		if(parms->COM_len > 0 &&
+		   parms->COM_len <= sizeof(cam->COM_data)) {
+			cam->COM_len = parms->COM_len;
+			memcpy(cam->COM_data, parms->COM_data, parms->COM_len);
+		} else {
+			LOG("Bad COM_len=%d\n", parms->COM_len);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_reqbufs
+ *
+ *  V4L2 Initiate memory mapping.
+ *  NOTE: The user's request is ignored. For now the buffers are fixed.
+ *
+ *****************************************************************************/
+
+static int ioctl_reqbufs(void *arg,struct camera_data *cam)
+{
+	struct v4l2_requestbuffers *req = arg;
+
+	if(req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+	   req->memory != V4L2_MEMORY_MMAP)
+		return -EINVAL;
+
+	DBG("REQBUFS requested:%d returning:%d\n", req->count, cam->num_frames);
+	req->count = cam->num_frames;
+	memset(&req->reserved, 0, sizeof(req->reserved));
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_querybuf
+ *
+ *  V4L2 Query memory buffer status.
+ *
+ *****************************************************************************/
+
+static int ioctl_querybuf(void *arg,struct camera_data *cam)
+{
+	struct v4l2_buffer *buf = arg;
+
+	if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+	   buf->index > cam->num_frames)
+		return -EINVAL;
+
+	buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
+	buf->length = cam->frame_size;
+
+	buf->memory = V4L2_MEMORY_MMAP;
+
+	if(cam->mmapped)
+		buf->flags = V4L2_BUF_FLAG_MAPPED;
+	else
+		buf->flags = 0;
+
+	switch (cam->buffers[buf->index].status) {
+	case FRAME_EMPTY:
+	case FRAME_ERROR:
+	case FRAME_READING:
+		buf->bytesused = 0;
+		buf->flags = V4L2_BUF_FLAG_QUEUED;
+		break;
+	case FRAME_READY:
+		buf->bytesused = cam->buffers[buf->index].length;
+		buf->timestamp = cam->buffers[buf->index].timestamp;
+		buf->sequence = cam->buffers[buf->index].seq;
+		buf->flags = V4L2_BUF_FLAG_DONE;
+		break;
+	}
+
+	DBG("QUERYBUF index:%d offset:%d flags:%d seq:%d bytesused:%d\n",
+	     buf->index, buf->m.offset, buf->flags, buf->sequence,
+	     buf->bytesused);
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_qbuf
+ *
+ *  V4L2 User is freeing buffer
+ *
+ *****************************************************************************/
+
+static int ioctl_qbuf(void *arg,struct camera_data *cam)
+{
+	struct v4l2_buffer *buf = arg;
+
+	if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+	   buf->memory != V4L2_MEMORY_MMAP ||
+	   buf->index > cam->num_frames)
+		return -EINVAL;
+
+	DBG("QBUF #%d\n", buf->index);
+
+	if(cam->buffers[buf->index].status == FRAME_READY)
+		cam->buffers[buf->index].status = FRAME_EMPTY;
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  find_earliest_filled_buffer
+ *
+ *  Helper for ioctl_dqbuf. Find the next ready buffer.
+ *
+ *****************************************************************************/
+
+static int find_earliest_filled_buffer(struct camera_data *cam)
+{
+	int i;
+	int found = -1;
+	for (i=0; i<cam->num_frames; i++) {
+		if(cam->buffers[i].status == FRAME_READY) {
+			if(found < 0) {
+				found = i;
+			} else {
+				/* find which buffer is earlier */
+				struct timeval *tv1, *tv2;
+				tv1 = &cam->buffers[i].timestamp;
+				tv2 = &cam->buffers[found].timestamp;
+				if(tv1->tv_sec < tv2->tv_sec ||
+				   (tv1->tv_sec == tv2->tv_sec &&
+				    tv1->tv_usec < tv2->tv_usec))
+					found = i;
+			}
+		}
+	}
+	return found;
+}
+
+/******************************************************************************
+ *
+ *  ioctl_dqbuf
+ *
+ *  V4L2 User is asking for a filled buffer.
+ *
+ *****************************************************************************/
+
+static int ioctl_dqbuf(void *arg,struct camera_data *cam, struct file *file)
+{
+	struct v4l2_buffer *buf = arg;
+	int frame;
+
+	if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+	   buf->memory != V4L2_MEMORY_MMAP)
+		return -EINVAL;
+
+	frame = find_earliest_filled_buffer(cam);
+
+	if(frame < 0 && file->f_flags&O_NONBLOCK)
+		return -EAGAIN;
+
+	if(frame < 0) {
+		/* Wait for a frame to become available */
+		struct framebuf *cb=cam->curbuff;
+		up(&cam->busy_lock);
+		wait_event_interruptible(cam->wq_stream,
+					 !cam->present ||
+					 (cb=cam->curbuff)->status == FRAME_READY);
+		down(&cam->busy_lock);
+		if (signal_pending(current))
+			return -ERESTARTSYS;
+		if(!cam->present)
+			return -ENOTTY;
+		frame = cb->num;
+	}
+
+
+	buf->index = frame;
+	buf->bytesused = cam->buffers[buf->index].length;
+	buf->flags = V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_DONE;
+	buf->field = V4L2_FIELD_NONE;
+	buf->timestamp = cam->buffers[buf->index].timestamp;
+	buf->sequence = cam->buffers[buf->index].seq;
+	buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
+	buf->length = cam->frame_size;
+	buf->input = 0;
+	buf->reserved = 0;
+	memset(&buf->timecode, 0, sizeof(buf->timecode));
+
+	DBG("DQBUF #%d status:%d seq:%d length:%d\n", buf->index,
+	    cam->buffers[buf->index].status, buf->sequence, buf->bytesused);
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  cpia2_ioctl
+ *
+ *****************************************************************************/
+static int cpia2_do_ioctl(struct inode *inode, struct file *file,
+			  unsigned int ioctl_nr, void *arg)
+{
+	struct video_device *dev = video_devdata(file);
+	struct camera_data *cam = video_get_drvdata(dev);
+	int retval = 0;
+
+	if (!cam)
+		return -ENOTTY;
+
+	/* make this _really_ smp-safe */
+	if (down_interruptible(&cam->busy_lock))
+		return -ERESTARTSYS;
+
+	if (!cam->present) {
+		up(&cam->busy_lock);
+		return -ENODEV;
+	}
+
+	/* Priority check */
+	switch (ioctl_nr) {
+	case VIDIOCSWIN:
+	case VIDIOCMCAPTURE:
+	case VIDIOC_S_FMT:
+	{
+		struct cpia2_fh *fh = file->private_data;
+		retval = v4l2_prio_check(&cam->prio, &fh->prio);
+		if(retval) {
+			up(&cam->busy_lock);
+			return retval;
+		}
+		break;
+	}
+	case VIDIOCGMBUF:
+	case VIDIOCSYNC:
+	{
+		struct cpia2_fh *fh = file->private_data;
+		if(fh->prio != V4L2_PRIORITY_RECORD) {
+			up(&cam->busy_lock);
+			return -EBUSY;
+		}
+		break;
+	}
+	default:
+		break;
+	}
+
+	switch (ioctl_nr) {
+	case VIDIOCGCAP:	/* query capabilites */
+		retval = ioctl_cap_query(arg, cam);
+		break;
+
+	case VIDIOCGCHAN:	/* get video source - we are a camera, nothing else */
+		retval = ioctl_get_channel(arg);
+		break;
+	case VIDIOCSCHAN:	/* set video source - we are a camera, nothing else */
+		retval = ioctl_set_channel(arg);
+		break;
+	case VIDIOCGPICT:	/* image properties */
+		memcpy(arg, &cam->vp, sizeof(struct video_picture));
+		break;
+	case VIDIOCSPICT:
+		retval = ioctl_set_image_prop(arg, cam);
+		break;
+	case VIDIOCGWIN:	/* get/set capture window */
+		memcpy(arg, &cam->vw, sizeof(struct video_window));
+		break;
+	case VIDIOCSWIN:
+		retval = ioctl_set_window_size(arg, cam, file->private_data);
+		break;
+	case VIDIOCGMBUF:	/* mmap interface */
+		retval = ioctl_get_mbuf(arg, cam);
+		break;
+	case VIDIOCMCAPTURE:
+		retval = ioctl_mcapture(arg, cam, file->private_data);
+		break;
+	case VIDIOCSYNC:
+		retval = ioctl_sync(arg, cam);
+		break;
+		/* pointless to implement overlay with this camera */
+	case VIDIOCCAPTURE:
+	case VIDIOCGFBUF:
+	case VIDIOCSFBUF:
+	case VIDIOCKEY:
+		retval = -EINVAL;
+		break;
+
+		/* tuner interface - we have none */
+	case VIDIOCGTUNER:
+	case VIDIOCSTUNER:
+	case VIDIOCGFREQ:
+	case VIDIOCSFREQ:
+		retval = -EINVAL;
+		break;
+
+		/* audio interface - we have none */
+	case VIDIOCGAUDIO:
+	case VIDIOCSAUDIO:
+		retval = -EINVAL;
+		break;
+
+	/* CPIA2 extension to Video4Linux API */
+	case CPIA2_IOC_SET_GPIO:
+		retval = ioctl_set_gpio(arg, cam);
+		break;
+	case VIDIOC_QUERYCAP:
+		retval = ioctl_querycap(arg,cam);
+		break;
+
+	case VIDIOC_ENUMINPUT:
+	case VIDIOC_G_INPUT:
+	case VIDIOC_S_INPUT:
+		retval = ioctl_input(ioctl_nr, arg,cam);
+		break;
+
+	case VIDIOC_ENUM_FMT:
+		retval = ioctl_enum_fmt(arg,cam);
+		break;
+	case VIDIOC_TRY_FMT:
+		retval = ioctl_try_fmt(arg,cam);
+		break;
+	case VIDIOC_G_FMT:
+		retval = ioctl_get_fmt(arg,cam);
+		break;
+	case VIDIOC_S_FMT:
+		retval = ioctl_set_fmt(arg,cam,file->private_data);
+		break;
+
+	case VIDIOC_CROPCAP:
+		retval = ioctl_cropcap(arg,cam);
+		break;
+	case VIDIOC_G_CROP:
+	case VIDIOC_S_CROP:
+		// TODO: I think cropping can be implemented - SJB
+		retval = -EINVAL;
+		break;
+
+	case VIDIOC_QUERYCTRL:
+		retval = ioctl_queryctrl(arg,cam);
+		break;
+	case VIDIOC_QUERYMENU:
+		retval = ioctl_querymenu(arg,cam);
+		break;
+	case VIDIOC_G_CTRL:
+		retval = ioctl_g_ctrl(arg,cam);
+		break;
+	case VIDIOC_S_CTRL:
+		retval = ioctl_s_ctrl(arg,cam);
+		break;
+
+	case VIDIOC_G_JPEGCOMP:
+		retval = ioctl_g_jpegcomp(arg,cam);
+		break;
+	case VIDIOC_S_JPEGCOMP:
+		retval = ioctl_s_jpegcomp(arg,cam);
+		break;
+
+	case VIDIOC_G_PRIORITY:
+	{
+		struct cpia2_fh *fh = file->private_data;
+		*(enum v4l2_priority*)arg = fh->prio;
+		break;
+	}
+	case VIDIOC_S_PRIORITY:
+	{
+		struct cpia2_fh *fh = file->private_data;
+		enum v4l2_priority prio;
+		prio = *(enum v4l2_priority*)arg;
+		if(cam->streaming &&
+		   prio != fh->prio &&
+		   fh->prio == V4L2_PRIORITY_RECORD) {
+			/* Can't drop record priority while streaming */
+			retval = -EBUSY;
+		} else if(prio == V4L2_PRIORITY_RECORD &&
+		   prio != fh->prio &&
+		   v4l2_prio_max(&cam->prio) == V4L2_PRIORITY_RECORD) {
+			/* Only one program can record at a time */
+			retval = -EBUSY;
+		} else {
+			retval = v4l2_prio_change(&cam->prio, &fh->prio, prio);
+		}
+		break;
+	}
+
+	case VIDIOC_REQBUFS:
+		retval = ioctl_reqbufs(arg,cam);
+		break;
+	case VIDIOC_QUERYBUF:
+		retval = ioctl_querybuf(arg,cam);
+		break;
+	case VIDIOC_QBUF:
+		retval = ioctl_qbuf(arg,cam);
+		break;
+	case VIDIOC_DQBUF:
+		retval = ioctl_dqbuf(arg,cam,file);
+		break;
+	case VIDIOC_STREAMON:
+	{
+		int type;
+		DBG("VIDIOC_STREAMON, streaming=%d\n", cam->streaming);
+		type = *(int*)arg;
+		if(!cam->mmapped || type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			retval = -EINVAL;
+
+		if(!cam->streaming) {
+			retval = cpia2_usb_stream_start(cam,
+					  cam->params.camera_state.stream_mode);
+		} else {
+			retval = -EINVAL;
+		}
+
+		break;
+	}
+	case VIDIOC_STREAMOFF:
+	{
+		int type;
+		DBG("VIDIOC_STREAMOFF, streaming=%d\n", cam->streaming);
+		type = *(int*)arg;
+		if(!cam->mmapped || type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			retval = -EINVAL;
+
+		if(cam->streaming) {
+			retval = cpia2_usb_stream_stop(cam);
+		} else {
+			retval = -EINVAL;
+		}
+
+		break;
+	}
+
+	case VIDIOC_ENUMOUTPUT:
+	case VIDIOC_G_OUTPUT:
+	case VIDIOC_S_OUTPUT:
+	case VIDIOC_G_MODULATOR:
+	case VIDIOC_S_MODULATOR:
+
+	case VIDIOC_ENUMAUDIO:
+	case VIDIOC_G_AUDIO:
+	case VIDIOC_S_AUDIO:
+
+	case VIDIOC_ENUMAUDOUT:
+	case VIDIOC_G_AUDOUT:
+	case VIDIOC_S_AUDOUT:
+
+	case VIDIOC_ENUMSTD:
+	case VIDIOC_QUERYSTD:
+	case VIDIOC_G_STD:
+	case VIDIOC_S_STD:
+
+	case VIDIOC_G_TUNER:
+	case VIDIOC_S_TUNER:
+	case VIDIOC_G_FREQUENCY:
+	case VIDIOC_S_FREQUENCY:
+
+	case VIDIOC_OVERLAY:
+	case VIDIOC_G_FBUF:
+	case VIDIOC_S_FBUF:
+
+	case VIDIOC_G_PARM:
+	case VIDIOC_S_PARM:
+		retval = -EINVAL;
+		break;
+	default:
+		retval = -ENOIOCTLCMD;
+		break;
+	}
+
+	up(&cam->busy_lock);
+	return retval;
+}
+
+static int cpia2_ioctl(struct inode *inode, struct file *file,
+		       unsigned int ioctl_nr, unsigned long iarg)
+{
+	return video_usercopy(inode, file, ioctl_nr, iarg, cpia2_do_ioctl);
+}
+
+/******************************************************************************
+ *
+ *  cpia2_mmap
+ *
+ *****************************************************************************/
+static int cpia2_mmap(struct file *file, struct vm_area_struct *area)
+{
+	int retval;
+	struct video_device *dev = video_devdata(file);
+	struct camera_data *cam = video_get_drvdata(dev);
+
+	/* Priority check */
+	struct cpia2_fh *fh = file->private_data;
+	if(fh->prio != V4L2_PRIORITY_RECORD) {
+		return -EBUSY;
+	}
+
+	retval = cpia2_remap_buffer(cam, area);
+
+	if(!retval)
+		fh->mmapped = 1;
+	return retval;
+}
+
+/******************************************************************************
+ *
+ *  reset_camera_struct_v4l
+ *
+ *  Sets all values to the defaults
+ *****************************************************************************/
+static void reset_camera_struct_v4l(struct camera_data *cam)
+{
+	/***
+	 * Fill in the v4l structures.  video_cap is filled in inside the VIDIOCCAP
+	 * Ioctl.  Here, just do the window and picture stucts.
+	 ***/
+	cam->vp.palette = (u16) VIDEO_PALETTE_RGB24;	/* Is this right? */
+	cam->vp.brightness = (u16) cam->params.color_params.brightness * 256;
+	cam->vp.colour = (u16) cam->params.color_params.saturation * 256;
+	cam->vp.contrast = (u16) cam->params.color_params.contrast * 256;
+
+	cam->vw.x = 0;
+	cam->vw.y = 0;
+	cam->vw.width = cam->params.roi.width;
+	cam->vw.height = cam->params.roi.height;
+	cam->vw.flags = 0;
+	cam->vw.clipcount = 0;
+
+	cam->frame_size = buffer_size;
+	cam->num_frames = num_buffers;
+
+	/* FlickerModes */
+	cam->params.flicker_control.flicker_mode_req = flicker_mode;
+	cam->params.flicker_control.mains_frequency = flicker_freq;
+
+	/* streamMode */
+	cam->params.camera_state.stream_mode = alternate;
+
+	cam->pixelformat = V4L2_PIX_FMT_JPEG;
+	v4l2_prio_init(&cam->prio);
+	return;
+}
+
+/***
+ * The v4l video device structure initialized for this device
+ ***/
+static struct file_operations fops_template = {
+	.owner=      THIS_MODULE,
+	.open=       cpia2_open,
+	.release=    cpia2_close,
+	.read=       cpia2_v4l_read,
+	.poll=       cpia2_v4l_poll,
+	.ioctl=      cpia2_ioctl,
+	.llseek=     no_llseek,
+	.mmap=       cpia2_mmap,
+};
+
+static struct video_device cpia2_template = {
+	/* I could not find any place for the old .initialize initializer?? */
+	.owner=		THIS_MODULE,
+	.name=		"CPiA2 Camera",
+	.type=		VID_TYPE_CAPTURE,
+	.type2 = 	V4L2_CAP_VIDEO_CAPTURE |
+			V4L2_CAP_STREAMING,
+	.hardware=	VID_HARDWARE_CPIA2,
+	.minor=		-1,
+	.fops=		&fops_template,
+	.release=	video_device_release,
+};
+
+/******************************************************************************
+ *
+ *  cpia2_register_camera
+ *
+ *****************************************************************************/
+int cpia2_register_camera(struct camera_data *cam)
+{
+	cam->vdev = video_device_alloc();
+	if(!cam->vdev)
+		return -ENOMEM;
+
+	memcpy(cam->vdev, &cpia2_template, sizeof(cpia2_template));
+	video_set_drvdata(cam->vdev, cam);
+
+	reset_camera_struct_v4l(cam);
+
+	/* register v4l device */
+	if (video_register_device
+	    (cam->vdev, VFL_TYPE_GRABBER, video_nr) == -1) {
+		ERR("video_register_device failed\n");
+		video_device_release(cam->vdev);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/******************************************************************************
+ *
+ *  cpia2_unregister_camera
+ *
+ *****************************************************************************/
+void cpia2_unregister_camera(struct camera_data *cam)
+{
+	if (!cam->open_count) {
+		video_unregister_device(cam->vdev);
+	} else {
+		LOG("/dev/video%d removed while open, "
+		    "deferring video_unregister_device\n",
+		    cam->vdev->minor);
+	}
+}
+
+/******************************************************************************
+ *
+ *  check_parameters
+ *
+ *  Make sure that all user-supplied parameters are sensible
+ *****************************************************************************/
+static void __init check_parameters(void)
+{
+	if(buffer_size < PAGE_SIZE) {
+		buffer_size = PAGE_SIZE;
+		LOG("buffer_size too small, setting to %d\n", buffer_size);
+	} else if(buffer_size > 1024*1024) {
+		/* arbitrary upper limiit */
+		buffer_size = 1024*1024;
+		LOG("buffer_size ridiculously large, setting to %d\n",
+		    buffer_size);
+	} else {
+		buffer_size += PAGE_SIZE-1;
+		buffer_size &= ~(PAGE_SIZE-1);
+	}
+
+	if(num_buffers < 1) {
+		num_buffers = 1;
+		LOG("num_buffers too small, setting to %d\n", num_buffers);
+	} else if(num_buffers > VIDEO_MAX_FRAME) {
+		num_buffers = VIDEO_MAX_FRAME;
+		LOG("num_buffers too large, setting to %d\n", num_buffers);
+	}
+
+	if(alternate < USBIF_ISO_1 || alternate > USBIF_ISO_6) {
+		alternate = DEFAULT_ALT;
+		LOG("alternate specified is invalid, using %d\n", alternate);
+	}
+
+	if (flicker_mode != NEVER_FLICKER && flicker_mode != ANTI_FLICKER_ON) {
+		flicker_mode = NEVER_FLICKER;
+		LOG("Flicker mode specified is invalid, using %d\n",
+		    flicker_mode);
+	}
+
+	if (flicker_freq != FLICKER_50 && flicker_freq != FLICKER_60) {
+		flicker_freq = FLICKER_60;
+		LOG("Flicker mode specified is invalid, using %d\n",
+		    flicker_freq);
+	}
+
+	if(video_nr < -1 || video_nr > 64) {
+		video_nr = -1;
+		LOG("invalid video_nr specified, must be -1 to 64\n");
+	}
+
+	DBG("Using %d buffers, each %d bytes, alternate=%d\n",
+	    num_buffers, buffer_size, alternate);
+}
+
+/************   Module Stuff ***************/
+
+
+/******************************************************************************
+ *
+ * cpia2_init/module_init
+ *
+ *****************************************************************************/
+int __init cpia2_init(void)
+{
+	LOG("%s v%d.%d.%d\n",
+	    ABOUT, CPIA2_MAJ_VER, CPIA2_MIN_VER, CPIA2_PATCH_VER);
+	check_parameters();
+	cpia2_usb_init();
+	return 0;
+}
+
+
+/******************************************************************************
+ *
+ * cpia2_exit/module_exit
+ *
+ *****************************************************************************/
+void __exit cpia2_exit(void)
+{
+	cpia2_usb_cleanup();
+	schedule_timeout(2 * HZ);
+}
+
+
+int __init cpia2_setup(char *str)
+{
+	while(str) {
+		if(!strncmp(str, "buffer_size:", 12)) {
+			buffer_size = simple_strtoul(str + 13, &str, 10);
+		} else if(!strncmp(str, "num_buffers:", 12)) {
+			num_buffers = simple_strtoul(str + 13, &str, 10);
+		} else if(!strncmp(str, "alternate:", 10)) {
+			alternate = simple_strtoul(str + 11, &str, 10);
+		} else if(!strncmp(str, "video_nr:", 9)) {
+			video_nr = simple_strtoul(str + 10, &str, 10);
+		} else if(!strncmp(str, "flicker_freq:",13)) {
+		   flicker_freq = simple_strtoul(str + 14, &str, 10);
+		} else if(!strncmp(str, "flicker_mode:",13)) {
+		   flicker_mode = simple_strtoul(str + 14, &str, 10);
+		} else {
+			++str;
+		}
+	}
+	return 1;
+}
+
+__setup("cpia2=", cpia2_setup);
+
+module_init(cpia2_init);
+module_exit(cpia2_exit);
+