[media] move the remaining USB drivers to drivers/media/usb

Move the 3 remaining usb drivers to their proper space.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 2700 insertions, 0 deletions

diff --git a/drivers/media/usb/s2255/Kconfig b/drivers/media/usb/s2255/Kconfig
new file mode 100644
index 000000000000..7e8ee1f864ab
--- /dev/null
+++ b/drivers/media/usb/s2255/Kconfig
@@ -0,0 +1,9 @@
+config USB_S2255
+	tristate "USB Sensoray 2255 video capture device"
+	depends on VIDEO_V4L2
+	select VIDEOBUF_VMALLOC
+	default n
+	help
+	  Say Y here if you want support for the Sensoray 2255 USB device.
+	  This driver can be compiled as a module, called s2255drv.
+
diff --git a/drivers/media/usb/s2255/Makefile b/drivers/media/usb/s2255/Makefile
new file mode 100644
index 000000000000..197d0bb2adfd
--- /dev/null
+++ b/drivers/media/usb/s2255/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_USB_S2255)		+= s2255drv.o
+
diff --git a/drivers/media/usb/s2255/s2255drv.c b/drivers/media/usb/s2255/s2255drv.c
new file mode 100644
index 000000000000..6c7960cc7506
--- /dev/null
+++ b/drivers/media/usb/s2255/s2255drv.c
@@ -0,0 +1,2689 @@
+/*
+ *  s2255drv.c - a driver for the Sensoray 2255 USB video capture device
+ *
+ *   Copyright (C) 2007-2010 by Sensoray Company Inc.
+ *                              Dean Anderson
+ *
+ * Some video buffer code based on vivi driver:
+ *
+ * Sensoray 2255 device supports 4 simultaneous channels.
+ * The channels are not "crossbar" inputs, they are physically
+ * attached to separate video decoders.
+ *
+ * Because of USB2.0 bandwidth limitations. There is only a
+ * certain amount of data which may be transferred at one time.
+ *
+ * Example maximum bandwidth utilization:
+ *
+ * -full size, color mode YUYV or YUV422P: 2 channels at once
+ * -full or half size Grey scale: all 4 channels at once
+ * -half size, color mode YUYV or YUV422P: all 4 channels at once
+ * -full size, color mode YUYV or YUV422P 1/2 frame rate: all 4 channels
+ *  at once.
+ *
+ * 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/module.h>
+#include <linux/firmware.h>
+#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+#include <linux/mm.h>
+#include <media/videobuf-vmalloc.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <linux/vmalloc.h>
+#include <linux/usb.h>
+
+#define S2255_VERSION		"1.22.1"
+#define FIRMWARE_FILE_NAME "f2255usb.bin"
+
+/* default JPEG quality */
+#define S2255_DEF_JPEG_QUAL     50
+/* vendor request in */
+#define S2255_VR_IN		0
+/* vendor request out */
+#define S2255_VR_OUT		1
+/* firmware query */
+#define S2255_VR_FW		0x30
+/* USB endpoint number for configuring the device */
+#define S2255_CONFIG_EP         2
+/* maximum time for DSP to start responding after last FW word loaded(ms) */
+#define S2255_DSP_BOOTTIME      800
+/* maximum time to wait for firmware to load (ms) */
+#define S2255_LOAD_TIMEOUT      (5000 + S2255_DSP_BOOTTIME)
+#define S2255_DEF_BUFS          16
+#define S2255_SETMODE_TIMEOUT   500
+#define S2255_VIDSTATUS_TIMEOUT 350
+#define S2255_MARKER_FRAME	cpu_to_le32(0x2255DA4AL)
+#define S2255_MARKER_RESPONSE	cpu_to_le32(0x2255ACACL)
+#define S2255_RESPONSE_SETMODE  cpu_to_le32(0x01)
+#define S2255_RESPONSE_FW       cpu_to_le32(0x10)
+#define S2255_RESPONSE_STATUS   cpu_to_le32(0x20)
+#define S2255_USB_XFER_SIZE	(16 * 1024)
+#define MAX_CHANNELS		4
+#define SYS_FRAMES		4
+/* maximum size is PAL full size plus room for the marker header(s) */
+#define SYS_FRAMES_MAXSIZE	(720*288*2*2 + 4096)
+#define DEF_USB_BLOCK		S2255_USB_XFER_SIZE
+#define LINE_SZ_4CIFS_NTSC	640
+#define LINE_SZ_2CIFS_NTSC	640
+#define LINE_SZ_1CIFS_NTSC	320
+#define LINE_SZ_4CIFS_PAL	704
+#define LINE_SZ_2CIFS_PAL	704
+#define LINE_SZ_1CIFS_PAL	352
+#define NUM_LINES_4CIFS_NTSC	240
+#define NUM_LINES_2CIFS_NTSC	240
+#define NUM_LINES_1CIFS_NTSC	240
+#define NUM_LINES_4CIFS_PAL	288
+#define NUM_LINES_2CIFS_PAL	288
+#define NUM_LINES_1CIFS_PAL	288
+#define LINE_SZ_DEF		640
+#define NUM_LINES_DEF		240
+
+
+/* predefined settings */
+#define FORMAT_NTSC	1
+#define FORMAT_PAL	2
+
+#define SCALE_4CIFS	1	/* 640x480(NTSC) or 704x576(PAL) */
+#define SCALE_2CIFS	2	/* 640x240(NTSC) or 704x288(PAL) */
+#define SCALE_1CIFS	3	/* 320x240(NTSC) or 352x288(PAL) */
+/* SCALE_4CIFSI is the 2 fields interpolated into one */
+#define SCALE_4CIFSI	4	/* 640x480(NTSC) or 704x576(PAL) high quality */
+
+#define COLOR_YUVPL	1	/* YUV planar */
+#define COLOR_YUVPK	2	/* YUV packed */
+#define COLOR_Y8	4	/* monochrome */
+#define COLOR_JPG       5       /* JPEG */
+
+#define MASK_COLOR       0x000000ff
+#define MASK_JPG_QUALITY 0x0000ff00
+#define MASK_INPUT_TYPE  0x000f0000
+/* frame decimation. */
+#define FDEC_1		1	/* capture every frame. default */
+#define FDEC_2		2	/* capture every 2nd frame */
+#define FDEC_3		3	/* capture every 3rd frame */
+#define FDEC_5		5	/* capture every 5th frame */
+
+/*-------------------------------------------------------
+ * Default mode parameters.
+ *-------------------------------------------------------*/
+#define DEF_SCALE	SCALE_4CIFS
+#define DEF_COLOR	COLOR_YUVPL
+#define DEF_FDEC	FDEC_1
+#define DEF_BRIGHT	0
+#define DEF_CONTRAST	0x5c
+#define DEF_SATURATION	0x80
+#define DEF_HUE		0
+
+/* usb config commands */
+#define IN_DATA_TOKEN	cpu_to_le32(0x2255c0de)
+#define CMD_2255	0xc2255000
+#define CMD_SET_MODE	cpu_to_le32((CMD_2255 | 0x10))
+#define CMD_START	cpu_to_le32((CMD_2255 | 0x20))
+#define CMD_STOP	cpu_to_le32((CMD_2255 | 0x30))
+#define CMD_STATUS	cpu_to_le32((CMD_2255 | 0x40))
+
+struct s2255_mode {
+	u32 format;	/* input video format (NTSC, PAL) */
+	u32 scale;	/* output video scale */
+	u32 color;	/* output video color format */
+	u32 fdec;	/* frame decimation */
+	u32 bright;	/* brightness */
+	u32 contrast;	/* contrast */
+	u32 saturation;	/* saturation */
+	u32 hue;	/* hue (NTSC only)*/
+	u32 single;	/* capture 1 frame at a time (!=0), continuously (==0)*/
+	u32 usb_block;	/* block size. should be 4096 of DEF_USB_BLOCK */
+	u32 restart;	/* if DSP requires restart */
+};
+
+
+#define S2255_READ_IDLE		0
+#define S2255_READ_FRAME	1
+
+/* frame structure */
+struct s2255_framei {
+	unsigned long size;
+	unsigned long ulState;	/* ulState:S2255_READ_IDLE, S2255_READ_FRAME*/
+	void *lpvbits;		/* image data */
+	unsigned long cur_size;	/* current data copied to it */
+};
+
+/* image buffer structure */
+struct s2255_bufferi {
+	unsigned long dwFrames;			/* number of frames in buffer */
+	struct s2255_framei frame[SYS_FRAMES];	/* array of FRAME structures */
+};
+
+#define DEF_MODEI_NTSC_CONT	{FORMAT_NTSC, DEF_SCALE, DEF_COLOR,	\
+			DEF_FDEC, DEF_BRIGHT, DEF_CONTRAST, DEF_SATURATION, \
+			DEF_HUE, 0, DEF_USB_BLOCK, 0}
+
+struct s2255_dmaqueue {
+	struct list_head	active;
+	struct s2255_dev	*dev;
+};
+
+/* for firmware loading, fw_state */
+#define S2255_FW_NOTLOADED	0
+#define S2255_FW_LOADED_DSPWAIT	1
+#define S2255_FW_SUCCESS	2
+#define S2255_FW_FAILED		3
+#define S2255_FW_DISCONNECTING  4
+#define S2255_FW_MARKER		cpu_to_le32(0x22552f2f)
+/* 2255 read states */
+#define S2255_READ_IDLE         0
+#define S2255_READ_FRAME        1
+struct s2255_fw {
+	int		      fw_loaded;
+	int		      fw_size;
+	struct urb	      *fw_urb;
+	atomic_t	      fw_state;
+	void		      *pfw_data;
+	wait_queue_head_t     wait_fw;
+	const struct firmware *fw;
+};
+
+struct s2255_pipeinfo {
+	u32 max_transfer_size;
+	u32 cur_transfer_size;
+	u8 *transfer_buffer;
+	u32 state;
+	void *stream_urb;
+	void *dev;	/* back pointer to s2255_dev struct*/
+	u32 err_count;
+	u32 idx;
+};
+
+struct s2255_fmt; /*forward declaration */
+struct s2255_dev;
+
+struct s2255_channel {
+	struct video_device	vdev;
+	int			resources;
+	struct s2255_dmaqueue	vidq;
+	struct s2255_bufferi	buffer;
+	struct s2255_mode	mode;
+	/* jpeg compression */
+	struct v4l2_jpegcompression jc;
+	/* capture parameters (for high quality mode full size) */
+	struct v4l2_captureparm cap_parm;
+	int			cur_frame;
+	int			last_frame;
+
+	int			b_acquire;
+	/* allocated image size */
+	unsigned long		req_image_size;
+	/* received packet size */
+	unsigned long		pkt_size;
+	int			bad_payload;
+	unsigned long		frame_count;
+	/* if JPEG image */
+	int                     jpg_size;
+	/* if channel configured to default state */
+	int                     configured;
+	wait_queue_head_t       wait_setmode;
+	int                     setmode_ready;
+	/* video status items */
+	int                     vidstatus;
+	wait_queue_head_t       wait_vidstatus;
+	int                     vidstatus_ready;
+	unsigned int		width;
+	unsigned int		height;
+	const struct s2255_fmt	*fmt;
+	int idx; /* channel number on device, 0-3 */
+};
+
+
+struct s2255_dev {
+	struct s2255_channel    channel[MAX_CHANNELS];
+	struct v4l2_device 	v4l2_dev;
+	atomic_t                num_channels;
+	int			frames;
+	struct mutex		lock;	/* channels[].vdev.lock */
+	struct usb_device	*udev;
+	struct usb_interface	*interface;
+	u8			read_endpoint;
+	struct timer_list	timer;
+	struct s2255_fw	*fw_data;
+	struct s2255_pipeinfo	pipe;
+	u32			cc;	/* current channel */
+	int			frame_ready;
+	int                     chn_ready;
+	spinlock_t              slock;
+	/* dsp firmware version (f2255usb.bin) */
+	int                     dsp_fw_ver;
+	u16                     pid; /* product id */
+};
+
+static inline struct s2255_dev *to_s2255_dev(struct v4l2_device *v4l2_dev)
+{
+	return container_of(v4l2_dev, struct s2255_dev, v4l2_dev);
+}
+
+struct s2255_fmt {
+	char *name;
+	u32 fourcc;
+	int depth;
+};
+
+/* buffer for one video frame */
+struct s2255_buffer {
+	/* common v4l buffer stuff -- must be first */
+	struct videobuf_buffer vb;
+	const struct s2255_fmt *fmt;
+};
+
+struct s2255_fh {
+	struct s2255_dev	*dev;
+	struct videobuf_queue	vb_vidq;
+	enum v4l2_buf_type	type;
+	struct s2255_channel	*channel;
+	int			resources;
+};
+
+/* current cypress EEPROM firmware version */
+#define S2255_CUR_USB_FWVER	((3 << 8) | 12)
+/* current DSP FW version */
+#define S2255_CUR_DSP_FWVER     10104
+/* Need DSP version 5+ for video status feature */
+#define S2255_MIN_DSP_STATUS      5
+#define S2255_MIN_DSP_COLORFILTER 8
+#define S2255_NORMS		(V4L2_STD_PAL | V4L2_STD_NTSC)
+
+/* private V4L2 controls */
+
+/*
+ * The following chart displays how COLORFILTER should be set
+ *  =========================================================
+ *  =     fourcc              =     COLORFILTER             =
+ *  =                         ===============================
+ *  =                         =   0             =    1      =
+ *  =========================================================
+ *  =  V4L2_PIX_FMT_GREY(Y8)  = monochrome from = monochrome=
+ *  =                         = s-video or      = composite =
+ *  =                         = B/W camera      = input     =
+ *  =========================================================
+ *  =    other                = color, svideo   = color,    =
+ *  =                         =                 = composite =
+ *  =========================================================
+ *
+ * Notes:
+ *   channels 0-3 on 2255 are composite
+ *   channels 0-1 on 2257 are composite, 2-3 are s-video
+ * If COLORFILTER is 0 with a composite color camera connected,
+ * the output will appear monochrome but hatching
+ * will occur.
+ * COLORFILTER is different from "color killer" and "color effects"
+ * for reasons above.
+ */
+#define S2255_V4L2_YC_ON  1
+#define S2255_V4L2_YC_OFF 0
+#define V4L2_CID_PRIVATE_COLORFILTER (V4L2_CID_PRIVATE_BASE + 0)
+
+/* frame prefix size (sent once every frame) */
+#define PREFIX_SIZE		512
+
+/* Channels on box are in reverse order */
+static unsigned long G_chnmap[MAX_CHANNELS] = {3, 2, 1, 0};
+
+static int debug;
+static int *s2255_debug = &debug;
+
+static int s2255_start_readpipe(struct s2255_dev *dev);
+static void s2255_stop_readpipe(struct s2255_dev *dev);
+static int s2255_start_acquire(struct s2255_channel *channel);
+static int s2255_stop_acquire(struct s2255_channel *channel);
+static void s2255_fillbuff(struct s2255_channel *chn, struct s2255_buffer *buf,
+			   int jpgsize);
+static int s2255_set_mode(struct s2255_channel *chan, struct s2255_mode *mode);
+static int s2255_board_shutdown(struct s2255_dev *dev);
+static void s2255_fwload_start(struct s2255_dev *dev, int reset);
+static void s2255_destroy(struct s2255_dev *dev);
+static long s2255_vendor_req(struct s2255_dev *dev, unsigned char req,
+			     u16 index, u16 value, void *buf,
+			     s32 buf_len, int bOut);
+
+/* dev_err macro with driver name */
+#define S2255_DRIVER_NAME "s2255"
+#define s2255_dev_err(dev, fmt, arg...)					\
+		dev_err(dev, S2255_DRIVER_NAME " - " fmt, ##arg)
+
+#define dprintk(level, fmt, arg...)					\
+	do {								\
+		if (*s2255_debug >= (level)) {				\
+			printk(KERN_DEBUG S2255_DRIVER_NAME		\
+				": " fmt, ##arg);			\
+		}							\
+	} while (0)
+
+static struct usb_driver s2255_driver;
+
+/* Declare static vars that will be used as parameters */
+static unsigned int vid_limit = 16;	/* Video memory limit, in Mb */
+
+/* start video number */
+static int video_nr = -1;	/* /dev/videoN, -1 for autodetect */
+
+/* Enable jpeg capture. */
+static int jpeg_enable = 1;
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Debug level(0-100) default 0");
+module_param(vid_limit, int, 0644);
+MODULE_PARM_DESC(vid_limit, "video memory limit(Mb)");
+module_param(video_nr, int, 0644);
+MODULE_PARM_DESC(video_nr, "start video minor(-1 default autodetect)");
+module_param(jpeg_enable, int, 0644);
+MODULE_PARM_DESC(jpeg_enable, "Jpeg enable(1-on 0-off) default 1");
+
+/* USB device table */
+#define USB_SENSORAY_VID	0x1943
+static struct usb_device_id s2255_table[] = {
+	{USB_DEVICE(USB_SENSORAY_VID, 0x2255)},
+	{USB_DEVICE(USB_SENSORAY_VID, 0x2257)}, /*same family as 2255*/
+	{ }			/* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, s2255_table);
+
+#define BUFFER_TIMEOUT msecs_to_jiffies(400)
+
+/* image formats.  */
+/* JPEG formats must be defined last to support jpeg_enable parameter */
+static const struct s2255_fmt formats[] = {
+	{
+		.name = "4:2:2, planar, YUV422P",
+		.fourcc = V4L2_PIX_FMT_YUV422P,
+		.depth = 16
+
+	}, {
+		.name = "4:2:2, packed, YUYV",
+		.fourcc = V4L2_PIX_FMT_YUYV,
+		.depth = 16
+
+	}, {
+		.name = "4:2:2, packed, UYVY",
+		.fourcc = V4L2_PIX_FMT_UYVY,
+		.depth = 16
+	}, {
+		.name = "8bpp GREY",
+		.fourcc = V4L2_PIX_FMT_GREY,
+		.depth = 8
+	}, {
+		.name = "JPG",
+		.fourcc = V4L2_PIX_FMT_JPEG,
+		.depth = 24
+	}, {
+		.name = "MJPG",
+		.fourcc = V4L2_PIX_FMT_MJPEG,
+		.depth = 24
+	}
+};
+
+static int norm_maxw(struct video_device *vdev)
+{
+	return (vdev->current_norm & V4L2_STD_NTSC) ?
+	    LINE_SZ_4CIFS_NTSC : LINE_SZ_4CIFS_PAL;
+}
+
+static int norm_maxh(struct video_device *vdev)
+{
+	return (vdev->current_norm & V4L2_STD_NTSC) ?
+	    (NUM_LINES_1CIFS_NTSC * 2) : (NUM_LINES_1CIFS_PAL * 2);
+}
+
+static int norm_minw(struct video_device *vdev)
+{
+	return (vdev->current_norm & V4L2_STD_NTSC) ?
+	    LINE_SZ_1CIFS_NTSC : LINE_SZ_1CIFS_PAL;
+}
+
+static int norm_minh(struct video_device *vdev)
+{
+	return (vdev->current_norm & V4L2_STD_NTSC) ?
+	    (NUM_LINES_1CIFS_NTSC) : (NUM_LINES_1CIFS_PAL);
+}
+
+
+/*
+ * TODO: fixme: move YUV reordering to hardware
+ * converts 2255 planar format to yuyv or uyvy
+ */
+static void planar422p_to_yuv_packed(const unsigned char *in,
+				     unsigned char *out,
+				     int width, int height,
+				     int fmt)
+{
+	unsigned char *pY;
+	unsigned char *pCb;
+	unsigned char *pCr;
+	unsigned long size = height * width;
+	unsigned int i;
+	pY = (unsigned char *)in;
+	pCr = (unsigned char *)in + height * width;
+	pCb = (unsigned char *)in + height * width + (height * width / 2);
+	for (i = 0; i < size * 2; i += 4) {
+		out[i] = (fmt == V4L2_PIX_FMT_YUYV) ? *pY++ : *pCr++;
+		out[i + 1] = (fmt == V4L2_PIX_FMT_YUYV) ? *pCr++ : *pY++;
+		out[i + 2] = (fmt == V4L2_PIX_FMT_YUYV) ? *pY++ : *pCb++;
+		out[i + 3] = (fmt == V4L2_PIX_FMT_YUYV) ? *pCb++ : *pY++;
+	}
+	return;
+}
+
+static void s2255_reset_dsppower(struct s2255_dev *dev)
+{
+	s2255_vendor_req(dev, 0x40, 0x0000, 0x0001, NULL, 0, 1);
+	msleep(10);
+	s2255_vendor_req(dev, 0x50, 0x0000, 0x0000, NULL, 0, 1);
+	msleep(600);
+	s2255_vendor_req(dev, 0x10, 0x0000, 0x0000, NULL, 0, 1);
+	return;
+}
+
+/* kickstarts the firmware loading. from probe
+ */
+static void s2255_timer(unsigned long user_data)
+{
+	struct s2255_fw *data = (struct s2255_fw *)user_data;
+	dprintk(100, "%s\n", __func__);
+	if (usb_submit_urb(data->fw_urb, GFP_ATOMIC) < 0) {
+		printk(KERN_ERR "s2255: can't submit urb\n");
+		atomic_set(&data->fw_state, S2255_FW_FAILED);
+		/* wake up anything waiting for the firmware */
+		wake_up(&data->wait_fw);
+		return;
+	}
+}
+
+
+/* this loads the firmware asynchronously.
+   Originally this was done synchroously in probe.
+   But it is better to load it asynchronously here than block
+   inside the probe function. Blocking inside probe affects boot time.
+   FW loading is triggered by the timer in the probe function
+*/
+static void s2255_fwchunk_complete(struct urb *urb)
+{
+	struct s2255_fw *data = urb->context;
+	struct usb_device *udev = urb->dev;
+	int len;
+	dprintk(100, "%s: udev %p urb %p", __func__, udev, urb);
+	if (urb->status) {
+		dev_err(&udev->dev, "URB failed with status %d\n", urb->status);
+		atomic_set(&data->fw_state, S2255_FW_FAILED);
+		/* wake up anything waiting for the firmware */
+		wake_up(&data->wait_fw);
+		return;
+	}
+	if (data->fw_urb == NULL) {
+		s2255_dev_err(&udev->dev, "disconnected\n");
+		atomic_set(&data->fw_state, S2255_FW_FAILED);
+		/* wake up anything waiting for the firmware */
+		wake_up(&data->wait_fw);
+		return;
+	}
+#define CHUNK_SIZE 512
+	/* all USB transfers must be done with continuous kernel memory.
+	   can't allocate more than 128k in current linux kernel, so
+	   upload the firmware in chunks
+	 */
+	if (data->fw_loaded < data->fw_size) {
+		len = (data->fw_loaded + CHUNK_SIZE) > data->fw_size ?
+		    data->fw_size % CHUNK_SIZE : CHUNK_SIZE;
+
+		if (len < CHUNK_SIZE)
+			memset(data->pfw_data, 0, CHUNK_SIZE);
+
+		dprintk(100, "completed len %d, loaded %d \n", len,
+			data->fw_loaded);
+
+		memcpy(data->pfw_data,
+		       (char *) data->fw->data + data->fw_loaded, len);
+
+		usb_fill_bulk_urb(data->fw_urb, udev, usb_sndbulkpipe(udev, 2),
+				  data->pfw_data, CHUNK_SIZE,
+				  s2255_fwchunk_complete, data);
+		if (usb_submit_urb(data->fw_urb, GFP_ATOMIC) < 0) {
+			dev_err(&udev->dev, "failed submit URB\n");
+			atomic_set(&data->fw_state, S2255_FW_FAILED);
+			/* wake up anything waiting for the firmware */
+			wake_up(&data->wait_fw);
+			return;
+		}
+		data->fw_loaded += len;
+	} else {
+		atomic_set(&data->fw_state, S2255_FW_LOADED_DSPWAIT);
+		dprintk(100, "%s: firmware upload complete\n", __func__);
+	}
+	return;
+
+}
+
+static int s2255_got_frame(struct s2255_channel *channel, int jpgsize)
+{
+	struct s2255_dmaqueue *dma_q = &channel->vidq;
+	struct s2255_buffer *buf;
+	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
+	unsigned long flags = 0;
+	int rc = 0;
+	spin_lock_irqsave(&dev->slock, flags);
+	if (list_empty(&dma_q->active)) {
+		dprintk(1, "No active queue to serve\n");
+		rc = -1;
+		goto unlock;
+	}
+	buf = list_entry(dma_q->active.next,
+			 struct s2255_buffer, vb.queue);
+	list_del(&buf->vb.queue);
+	do_gettimeofday(&buf->vb.ts);
+	s2255_fillbuff(channel, buf, jpgsize);
+	wake_up(&buf->vb.done);
+	dprintk(2, "%s: [buf/i] [%p/%d]\n", __func__, buf, buf->vb.i);
+unlock:
+	spin_unlock_irqrestore(&dev->slock, flags);
+	return rc;
+}
+
+static const struct s2255_fmt *format_by_fourcc(int fourcc)
+{
+	unsigned int i;
+	for (i = 0; i < ARRAY_SIZE(formats); i++) {
+		if (-1 == formats[i].fourcc)
+			continue;
+	if (!jpeg_enable && ((formats[i].fourcc == V4L2_PIX_FMT_JPEG) ||
+			     (formats[i].fourcc == V4L2_PIX_FMT_MJPEG)))
+	    continue;
+		if (formats[i].fourcc == fourcc)
+			return formats + i;
+	}
+	return NULL;
+}
+
+/* video buffer vmalloc implementation based partly on VIVI driver which is
+ *          Copyright (c) 2006 by
+ *                  Mauro Carvalho Chehab <mchehab--a.t--infradead.org>
+ *                  Ted Walther <ted--a.t--enumera.com>
+ *                  John Sokol <sokol--a.t--videotechnology.com>
+ *                  http://v4l.videotechnology.com/
+ *
+ */
+static void s2255_fillbuff(struct s2255_channel *channel,
+			   struct s2255_buffer *buf, int jpgsize)
+{
+	int pos = 0;
+	struct timeval ts;
+	const char *tmpbuf;
+	char *vbuf = videobuf_to_vmalloc(&buf->vb);
+	unsigned long last_frame;
+
+	if (!vbuf)
+		return;
+	last_frame = channel->last_frame;
+	if (last_frame != -1) {
+		tmpbuf =
+		    (const char *)channel->buffer.frame[last_frame].lpvbits;
+		switch (buf->fmt->fourcc) {
+		case V4L2_PIX_FMT_YUYV:
+		case V4L2_PIX_FMT_UYVY:
+			planar422p_to_yuv_packed((const unsigned char *)tmpbuf,
+						 vbuf, buf->vb.width,
+						 buf->vb.height,
+						 buf->fmt->fourcc);
+			break;
+		case V4L2_PIX_FMT_GREY:
+			memcpy(vbuf, tmpbuf, buf->vb.width * buf->vb.height);
+			break;
+		case V4L2_PIX_FMT_JPEG:
+		case V4L2_PIX_FMT_MJPEG:
+			buf->vb.size = jpgsize;
+			memcpy(vbuf, tmpbuf, buf->vb.size);
+			break;
+		case V4L2_PIX_FMT_YUV422P:
+			memcpy(vbuf, tmpbuf,
+			       buf->vb.width * buf->vb.height * 2);
+			break;
+		default:
+			printk(KERN_DEBUG "s2255: unknown format?\n");
+		}
+		channel->last_frame = -1;
+	} else {
+		printk(KERN_ERR "s2255: =======no frame\n");
+		return;
+
+	}
+	dprintk(2, "s2255fill at : Buffer 0x%08lx size= %d\n",
+		(unsigned long)vbuf, pos);
+	/* tell v4l buffer was filled */
+
+	buf->vb.field_count = channel->frame_count * 2;
+	do_gettimeofday(&ts);
+	buf->vb.ts = ts;
+	buf->vb.state = VIDEOBUF_DONE;
+}
+
+
+/* ------------------------------------------------------------------
+   Videobuf operations
+   ------------------------------------------------------------------*/
+
+static int buffer_setup(struct videobuf_queue *vq, unsigned int *count,
+			unsigned int *size)
+{
+	struct s2255_fh *fh = vq->priv_data;
+	struct s2255_channel *channel = fh->channel;
+	*size = channel->width * channel->height * (channel->fmt->depth >> 3);
+
+	if (0 == *count)
+		*count = S2255_DEF_BUFS;
+
+	if (*size * *count > vid_limit * 1024 * 1024)
+		*count = (vid_limit * 1024 * 1024) / *size;
+
+	return 0;
+}
+
+static void free_buffer(struct videobuf_queue *vq, struct s2255_buffer *buf)
+{
+	dprintk(4, "%s\n", __func__);
+
+	videobuf_vmalloc_free(&buf->vb);
+	buf->vb.state = VIDEOBUF_NEEDS_INIT;
+}
+
+static int buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
+			  enum v4l2_field field)
+{
+	struct s2255_fh *fh = vq->priv_data;
+	struct s2255_channel *channel = fh->channel;
+	struct s2255_buffer *buf = container_of(vb, struct s2255_buffer, vb);
+	int rc;
+	int w = channel->width;
+	int h = channel->height;
+	dprintk(4, "%s, field=%d\n", __func__, field);
+	if (channel->fmt == NULL)
+		return -EINVAL;
+
+	if ((w < norm_minw(&channel->vdev)) ||
+	    (w > norm_maxw(&channel->vdev)) ||
+	    (h < norm_minh(&channel->vdev)) ||
+	    (h > norm_maxh(&channel->vdev))) {
+		dprintk(4, "invalid buffer prepare\n");
+		return -EINVAL;
+	}
+	buf->vb.size = w * h * (channel->fmt->depth >> 3);
+	if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) {
+		dprintk(4, "invalid buffer prepare\n");
+		return -EINVAL;
+	}
+
+	buf->fmt = channel->fmt;
+	buf->vb.width = w;
+	buf->vb.height = h;
+	buf->vb.field = field;
+
+	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
+		rc = videobuf_iolock(vq, &buf->vb, NULL);
+		if (rc < 0)
+			goto fail;
+	}
+
+	buf->vb.state = VIDEOBUF_PREPARED;
+	return 0;
+fail:
+	free_buffer(vq, buf);
+	return rc;
+}
+
+static void buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
+{
+	struct s2255_buffer *buf = container_of(vb, struct s2255_buffer, vb);
+	struct s2255_fh *fh = vq->priv_data;
+	struct s2255_channel *channel = fh->channel;
+	struct s2255_dmaqueue *vidq = &channel->vidq;
+	dprintk(1, "%s\n", __func__);
+	buf->vb.state = VIDEOBUF_QUEUED;
+	list_add_tail(&buf->vb.queue, &vidq->active);
+}
+
+static void buffer_release(struct videobuf_queue *vq,
+			   struct videobuf_buffer *vb)
+{
+	struct s2255_buffer *buf = container_of(vb, struct s2255_buffer, vb);
+	struct s2255_fh *fh = vq->priv_data;
+	dprintk(4, "%s %d\n", __func__, fh->channel->idx);
+	free_buffer(vq, buf);
+}
+
+static struct videobuf_queue_ops s2255_video_qops = {
+	.buf_setup = buffer_setup,
+	.buf_prepare = buffer_prepare,
+	.buf_queue = buffer_queue,
+	.buf_release = buffer_release,
+};
+
+
+static int res_get(struct s2255_fh *fh)
+{
+	struct s2255_channel *channel = fh->channel;
+	/* is it free? */
+	if (channel->resources)
+		return 0; /* no, someone else uses it */
+	/* it's free, grab it */
+	channel->resources = 1;
+	fh->resources = 1;
+	dprintk(1, "s2255: res: get\n");
+	return 1;
+}
+
+static int res_locked(struct s2255_fh *fh)
+{
+	return fh->channel->resources;
+}
+
+static int res_check(struct s2255_fh *fh)
+{
+	return fh->resources;
+}
+
+
+static void res_free(struct s2255_fh *fh)
+{
+	struct s2255_channel *channel = fh->channel;
+	channel->resources = 0;
+	fh->resources = 0;
+	dprintk(1, "res: put\n");
+}
+
+static int vidioc_querymenu(struct file *file, void *priv,
+			    struct v4l2_querymenu *qmenu)
+{
+	static const char *colorfilter[] = {
+		"Off",
+		"On",
+		NULL
+	};
+	if (qmenu->id == V4L2_CID_PRIVATE_COLORFILTER) {
+		int i;
+		const char **menu_items = colorfilter;
+		for (i = 0; i < qmenu->index && menu_items[i]; i++)
+			; /* do nothing (from v4l2-common.c) */
+		if (menu_items[i] == NULL || menu_items[i][0] == '\0')
+			return -EINVAL;
+		strlcpy(qmenu->name, menu_items[qmenu->index],
+			sizeof(qmenu->name));
+		return 0;
+	}
+	return v4l2_ctrl_query_menu(qmenu, NULL, NULL);
+}
+
+static int vidioc_querycap(struct file *file, void *priv,
+			   struct v4l2_capability *cap)
+{
+	struct s2255_fh *fh = file->private_data;
+	struct s2255_dev *dev = fh->dev;
+	strlcpy(cap->driver, "s2255", sizeof(cap->driver));
+	strlcpy(cap->card, "s2255", sizeof(cap->card));
+	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
+	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+	return 0;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
+			       struct v4l2_fmtdesc *f)
+{
+	int index = f->index;
+
+	if (index >= ARRAY_SIZE(formats))
+		return -EINVAL;
+	if (!jpeg_enable && ((formats[index].fourcc == V4L2_PIX_FMT_JPEG) ||
+			(formats[index].fourcc == V4L2_PIX_FMT_MJPEG)))
+		return -EINVAL;
+	dprintk(4, "name %s\n", formats[index].name);
+	strlcpy(f->description, formats[index].name, sizeof(f->description));
+	f->pixelformat = formats[index].fourcc;
+	return 0;
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+			    struct v4l2_format *f)
+{
+	struct s2255_fh *fh = priv;
+	struct s2255_channel *channel = fh->channel;
+
+	f->fmt.pix.width = channel->width;
+	f->fmt.pix.height = channel->height;
+	f->fmt.pix.field = fh->vb_vidq.field;
+	f->fmt.pix.pixelformat = channel->fmt->fourcc;
+	f->fmt.pix.bytesperline = f->fmt.pix.width * (channel->fmt->depth >> 3);
+	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
+	return 0;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+			      struct v4l2_format *f)
+{
+	const struct s2255_fmt *fmt;
+	enum v4l2_field field;
+	int  b_any_field = 0;
+	struct s2255_fh *fh = priv;
+	struct s2255_channel *channel = fh->channel;
+	int is_ntsc;
+	is_ntsc =
+		(channel->vdev.current_norm & V4L2_STD_NTSC) ? 1 : 0;
+
+	fmt = format_by_fourcc(f->fmt.pix.pixelformat);
+
+	if (fmt == NULL)
+		return -EINVAL;
+
+	field = f->fmt.pix.field;
+	if (field == V4L2_FIELD_ANY)
+		b_any_field = 1;
+
+	dprintk(50, "%s NTSC: %d suggested width: %d, height: %d\n",
+		__func__, is_ntsc, f->fmt.pix.width, f->fmt.pix.height);
+	if (is_ntsc) {
+		/* NTSC */
+		if (f->fmt.pix.height >= NUM_LINES_1CIFS_NTSC * 2) {
+			f->fmt.pix.height = NUM_LINES_1CIFS_NTSC * 2;
+			if (b_any_field) {
+				field = V4L2_FIELD_SEQ_TB;
+			} else if (!((field == V4L2_FIELD_INTERLACED) ||
+				      (field == V4L2_FIELD_SEQ_TB) ||
+				      (field == V4L2_FIELD_INTERLACED_TB))) {
+				dprintk(1, "unsupported field setting\n");
+				return -EINVAL;
+			}
+		} else {
+			f->fmt.pix.height = NUM_LINES_1CIFS_NTSC;
+			if (b_any_field) {
+				field = V4L2_FIELD_TOP;
+			} else if (!((field == V4L2_FIELD_TOP) ||
+				      (field == V4L2_FIELD_BOTTOM))) {
+				dprintk(1, "unsupported field setting\n");
+				return -EINVAL;
+			}
+
+		}
+		if (f->fmt.pix.width >= LINE_SZ_4CIFS_NTSC)
+			f->fmt.pix.width = LINE_SZ_4CIFS_NTSC;
+		else if (f->fmt.pix.width >= LINE_SZ_2CIFS_NTSC)
+			f->fmt.pix.width = LINE_SZ_2CIFS_NTSC;
+		else if (f->fmt.pix.width >= LINE_SZ_1CIFS_NTSC)
+			f->fmt.pix.width = LINE_SZ_1CIFS_NTSC;
+		else
+			f->fmt.pix.width = LINE_SZ_1CIFS_NTSC;
+	} else {
+		/* PAL */
+		if (f->fmt.pix.height >= NUM_LINES_1CIFS_PAL * 2) {
+			f->fmt.pix.height = NUM_LINES_1CIFS_PAL * 2;
+			if (b_any_field) {
+				field = V4L2_FIELD_SEQ_TB;
+			} else if (!((field == V4L2_FIELD_INTERLACED) ||
+				      (field == V4L2_FIELD_SEQ_TB) ||
+				      (field == V4L2_FIELD_INTERLACED_TB))) {
+				dprintk(1, "unsupported field setting\n");
+				return -EINVAL;
+			}
+		} else {
+			f->fmt.pix.height = NUM_LINES_1CIFS_PAL;
+			if (b_any_field) {
+				field = V4L2_FIELD_TOP;
+			} else if (!((field == V4L2_FIELD_TOP) ||
+				     (field == V4L2_FIELD_BOTTOM))) {
+				dprintk(1, "unsupported field setting\n");
+				return -EINVAL;
+			}
+		}
+		if (f->fmt.pix.width >= LINE_SZ_4CIFS_PAL) {
+			f->fmt.pix.width = LINE_SZ_4CIFS_PAL;
+			field = V4L2_FIELD_SEQ_TB;
+		} else if (f->fmt.pix.width >= LINE_SZ_2CIFS_PAL) {
+			f->fmt.pix.width = LINE_SZ_2CIFS_PAL;
+			field = V4L2_FIELD_TOP;
+		} else if (f->fmt.pix.width >= LINE_SZ_1CIFS_PAL) {
+			f->fmt.pix.width = LINE_SZ_1CIFS_PAL;
+			field = V4L2_FIELD_TOP;
+		} else {
+			f->fmt.pix.width = LINE_SZ_1CIFS_PAL;
+			field = V4L2_FIELD_TOP;
+		}
+	}
+	f->fmt.pix.field = field;
+	f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
+	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
+	dprintk(50, "%s: set width %d height %d field %d\n", __func__,
+		f->fmt.pix.width, f->fmt.pix.height, f->fmt.pix.field);
+	return 0;
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+			    struct v4l2_format *f)
+{
+	struct s2255_fh *fh = priv;
+	struct s2255_channel *channel = fh->channel;
+	const struct s2255_fmt *fmt;
+	struct videobuf_queue *q = &fh->vb_vidq;
+	struct s2255_mode mode;
+	int ret;
+
+	ret = vidioc_try_fmt_vid_cap(file, fh, f);
+
+	if (ret < 0)
+		return ret;
+
+	fmt = format_by_fourcc(f->fmt.pix.pixelformat);
+
+	if (fmt == NULL)
+		return -EINVAL;
+
+	mutex_lock(&q->vb_lock);
+
+	if (videobuf_queue_is_busy(&fh->vb_vidq)) {
+		dprintk(1, "queue busy\n");
+		ret = -EBUSY;
+		goto out_s_fmt;
+	}
+
+	if (res_locked(fh)) {
+		dprintk(1, "%s: channel busy\n", __func__);
+		ret = -EBUSY;
+		goto out_s_fmt;
+	}
+	mode = channel->mode;
+	channel->fmt = fmt;
+	channel->width = f->fmt.pix.width;
+	channel->height = f->fmt.pix.height;
+	fh->vb_vidq.field = f->fmt.pix.field;
+	fh->type = f->type;
+	if (channel->width > norm_minw(&channel->vdev)) {
+		if (channel->height > norm_minh(&channel->vdev)) {
+			if (channel->cap_parm.capturemode &
+			    V4L2_MODE_HIGHQUALITY)
+				mode.scale = SCALE_4CIFSI;
+			else
+				mode.scale = SCALE_4CIFS;
+		} else
+			mode.scale = SCALE_2CIFS;
+
+	} else {
+		mode.scale = SCALE_1CIFS;
+	}
+	/* color mode */
+	switch (channel->fmt->fourcc) {
+	case V4L2_PIX_FMT_GREY:
+		mode.color &= ~MASK_COLOR;
+		mode.color |= COLOR_Y8;
+		break;
+	case V4L2_PIX_FMT_JPEG:
+	case V4L2_PIX_FMT_MJPEG:
+		mode.color &= ~MASK_COLOR;
+		mode.color |= COLOR_JPG;
+		mode.color |= (channel->jc.quality << 8);
+		break;
+	case V4L2_PIX_FMT_YUV422P:
+		mode.color &= ~MASK_COLOR;
+		mode.color |= COLOR_YUVPL;
+		break;
+	case V4L2_PIX_FMT_YUYV:
+	case V4L2_PIX_FMT_UYVY:
+	default:
+		mode.color &= ~MASK_COLOR;
+		mode.color |= COLOR_YUVPK;
+		break;
+	}
+	if ((mode.color & MASK_COLOR) != (channel->mode.color & MASK_COLOR))
+		mode.restart = 1;
+	else if (mode.scale != channel->mode.scale)
+		mode.restart = 1;
+	else if (mode.format != channel->mode.format)
+		mode.restart = 1;
+	channel->mode = mode;
+	(void) s2255_set_mode(channel, &mode);
+	ret = 0;
+out_s_fmt:
+	mutex_unlock(&q->vb_lock);
+	return ret;
+}
+
+static int vidioc_reqbufs(struct file *file, void *priv,
+			  struct v4l2_requestbuffers *p)
+{
+	int rc;
+	struct s2255_fh *fh = priv;
+	rc = videobuf_reqbufs(&fh->vb_vidq, p);
+	return rc;
+}
+
+static int vidioc_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
+{
+	int rc;
+	struct s2255_fh *fh = priv;
+	rc = videobuf_querybuf(&fh->vb_vidq, p);
+	return rc;
+}
+
+static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
+{
+	int rc;
+	struct s2255_fh *fh = priv;
+	rc = videobuf_qbuf(&fh->vb_vidq, p);
+	return rc;
+}
+
+static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
+{
+	int rc;
+	struct s2255_fh *fh = priv;
+	rc = videobuf_dqbuf(&fh->vb_vidq, p, file->f_flags & O_NONBLOCK);
+	return rc;
+}
+
+/* write to the configuration pipe, synchronously */
+static int s2255_write_config(struct usb_device *udev, unsigned char *pbuf,
+			      int size)
+{
+	int pipe;
+	int done;
+	long retval = -1;
+	if (udev) {
+		pipe = usb_sndbulkpipe(udev, S2255_CONFIG_EP);
+		retval = usb_bulk_msg(udev, pipe, pbuf, size, &done, 500);
+	}
+	return retval;
+}
+
+static u32 get_transfer_size(struct s2255_mode *mode)
+{
+	int linesPerFrame = LINE_SZ_DEF;
+	int pixelsPerLine = NUM_LINES_DEF;
+	u32 outImageSize;
+	u32 usbInSize;
+	unsigned int mask_mult;
+
+	if (mode == NULL)
+		return 0;
+
+	if (mode->format == FORMAT_NTSC) {
+		switch (mode->scale) {
+		case SCALE_4CIFS:
+		case SCALE_4CIFSI:
+			linesPerFrame = NUM_LINES_4CIFS_NTSC * 2;
+			pixelsPerLine = LINE_SZ_4CIFS_NTSC;
+			break;
+		case SCALE_2CIFS:
+			linesPerFrame = NUM_LINES_2CIFS_NTSC;
+			pixelsPerLine = LINE_SZ_2CIFS_NTSC;
+			break;
+		case SCALE_1CIFS:
+			linesPerFrame = NUM_LINES_1CIFS_NTSC;
+			pixelsPerLine = LINE_SZ_1CIFS_NTSC;
+			break;
+		default:
+			break;
+		}
+	} else if (mode->format == FORMAT_PAL) {
+		switch (mode->scale) {
+		case SCALE_4CIFS:
+		case SCALE_4CIFSI:
+			linesPerFrame = NUM_LINES_4CIFS_PAL * 2;
+			pixelsPerLine = LINE_SZ_4CIFS_PAL;
+			break;
+		case SCALE_2CIFS:
+			linesPerFrame = NUM_LINES_2CIFS_PAL;
+			pixelsPerLine = LINE_SZ_2CIFS_PAL;
+			break;
+		case SCALE_1CIFS:
+			linesPerFrame = NUM_LINES_1CIFS_PAL;
+			pixelsPerLine = LINE_SZ_1CIFS_PAL;
+			break;
+		default:
+			break;
+		}
+	}
+	outImageSize = linesPerFrame * pixelsPerLine;
+	if ((mode->color & MASK_COLOR) != COLOR_Y8) {
+		/* 2 bytes/pixel if not monochrome */
+		outImageSize *= 2;
+	}
+
+	/* total bytes to send including prefix and 4K padding;
+	   must be a multiple of USB_READ_SIZE */
+	usbInSize = outImageSize + PREFIX_SIZE;	/* always send prefix */
+	mask_mult = 0xffffffffUL - DEF_USB_BLOCK + 1;
+	/* if size not a multiple of USB_READ_SIZE */
+	if (usbInSize & ~mask_mult)
+		usbInSize = (usbInSize & mask_mult) + (DEF_USB_BLOCK);
+	return usbInSize;
+}
+
+static void s2255_print_cfg(struct s2255_dev *sdev, struct s2255_mode *mode)
+{
+	struct device *dev = &sdev->udev->dev;
+	dev_info(dev, "------------------------------------------------\n");
+	dev_info(dev, "format: %d\nscale %d\n", mode->format, mode->scale);
+	dev_info(dev, "fdec: %d\ncolor %d\n", mode->fdec, mode->color);
+	dev_info(dev, "bright: 0x%x\n", mode->bright);
+	dev_info(dev, "------------------------------------------------\n");
+}
+
+/*
+ * set mode is the function which controls the DSP.
+ * the restart parameter in struct s2255_mode should be set whenever
+ * the image size could change via color format, video system or image
+ * size.
+ * When the restart parameter is set, we sleep for ONE frame to allow the
+ * DSP time to get the new frame
+ */
+static int s2255_set_mode(struct s2255_channel *channel,
+			  struct s2255_mode *mode)
+{
+	int res;
+	__le32 *buffer;
+	unsigned long chn_rev;
+	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
+	chn_rev = G_chnmap[channel->idx];
+	dprintk(3, "%s channel: %d\n", __func__, channel->idx);
+	/* if JPEG, set the quality */
+	if ((mode->color & MASK_COLOR) == COLOR_JPG) {
+		mode->color &= ~MASK_COLOR;
+		mode->color |= COLOR_JPG;
+		mode->color &= ~MASK_JPG_QUALITY;
+		mode->color |= (channel->jc.quality << 8);
+	}
+	/* save the mode */
+	channel->mode = *mode;
+	channel->req_image_size = get_transfer_size(mode);
+	dprintk(1, "%s: reqsize %ld\n", __func__, channel->req_image_size);
+	buffer = kzalloc(512, GFP_KERNEL);
+	if (buffer == NULL) {
+		dev_err(&dev->udev->dev, "out of mem\n");
+		return -ENOMEM;
+	}
+	/* set the mode */
+	buffer[0] = IN_DATA_TOKEN;
+	buffer[1] = (__le32) cpu_to_le32(chn_rev);
+	buffer[2] = CMD_SET_MODE;
+	memcpy(&buffer[3], &channel->mode, sizeof(struct s2255_mode));
+	channel->setmode_ready = 0;
+	res = s2255_write_config(dev->udev, (unsigned char *)buffer, 512);
+	if (debug)
+		s2255_print_cfg(dev, mode);
+	kfree(buffer);
+	/* wait at least 3 frames before continuing */
+	if (mode->restart) {
+		wait_event_timeout(channel->wait_setmode,
+				   (channel->setmode_ready != 0),
+				   msecs_to_jiffies(S2255_SETMODE_TIMEOUT));
+		if (channel->setmode_ready != 1) {
+			printk(KERN_DEBUG "s2255: no set mode response\n");
+			res = -EFAULT;
+		}
+	}
+	/* clear the restart flag */
+	channel->mode.restart = 0;
+	dprintk(1, "%s chn %d, result: %d\n", __func__, channel->idx, res);
+	return res;
+}
+
+static int s2255_cmd_status(struct s2255_channel *channel, u32 *pstatus)
+{
+	int res;
+	__le32 *buffer;
+	u32 chn_rev;
+	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
+	chn_rev = G_chnmap[channel->idx];
+	dprintk(4, "%s chan %d\n", __func__, channel->idx);
+	buffer = kzalloc(512, GFP_KERNEL);
+	if (buffer == NULL) {
+		dev_err(&dev->udev->dev, "out of mem\n");
+		return -ENOMEM;
+	}
+	/* form the get vid status command */
+	buffer[0] = IN_DATA_TOKEN;
+	buffer[1] = (__le32) cpu_to_le32(chn_rev);
+	buffer[2] = CMD_STATUS;
+	*pstatus = 0;
+	channel->vidstatus_ready = 0;
+	res = s2255_write_config(dev->udev, (unsigned char *)buffer, 512);
+	kfree(buffer);
+	wait_event_timeout(channel->wait_vidstatus,
+			   (channel->vidstatus_ready != 0),
+			   msecs_to_jiffies(S2255_VIDSTATUS_TIMEOUT));
+	if (channel->vidstatus_ready != 1) {
+		printk(KERN_DEBUG "s2255: no vidstatus response\n");
+		res = -EFAULT;
+	}
+	*pstatus = channel->vidstatus;
+	dprintk(4, "%s, vid status %d\n", __func__, *pstatus);
+	return res;
+}
+
+static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
+{
+	int res;
+	struct s2255_fh *fh = priv;
+	struct s2255_dev *dev = fh->dev;
+	struct s2255_channel *channel = fh->channel;
+	int j;
+	dprintk(4, "%s\n", __func__);
+	if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+		dev_err(&dev->udev->dev, "invalid fh type0\n");
+		return -EINVAL;
+	}
+	if (i != fh->type) {
+		dev_err(&dev->udev->dev, "invalid fh type1\n");
+		return -EINVAL;
+	}
+
+	if (!res_get(fh)) {
+		s2255_dev_err(&dev->udev->dev, "stream busy\n");
+		return -EBUSY;
+	}
+	channel->last_frame = -1;
+	channel->bad_payload = 0;
+	channel->cur_frame = 0;
+	channel->frame_count = 0;
+	for (j = 0; j < SYS_FRAMES; j++) {
+		channel->buffer.frame[j].ulState = S2255_READ_IDLE;
+		channel->buffer.frame[j].cur_size = 0;
+	}
+	res = videobuf_streamon(&fh->vb_vidq);
+	if (res == 0) {
+		s2255_start_acquire(channel);
+		channel->b_acquire = 1;
+	} else
+		res_free(fh);
+
+	return res;
+}
+
+static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
+{
+	struct s2255_fh *fh = priv;
+	dprintk(4, "%s\n, channel: %d", __func__, fh->channel->idx);
+	if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+		printk(KERN_ERR "invalid fh type0\n");
+		return -EINVAL;
+	}
+	if (i != fh->type) {
+		printk(KERN_ERR "invalid type i\n");
+		return -EINVAL;
+	}
+	s2255_stop_acquire(fh->channel);
+	videobuf_streamoff(&fh->vb_vidq);
+	res_free(fh);
+	return 0;
+}
+
+static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *i)
+{
+	struct s2255_fh *fh = priv;
+	struct s2255_mode mode;
+	struct videobuf_queue *q = &fh->vb_vidq;
+	int ret = 0;
+	mutex_lock(&q->vb_lock);
+	if (videobuf_queue_is_busy(q)) {
+		dprintk(1, "queue busy\n");
+		ret = -EBUSY;
+		goto out_s_std;
+	}
+	if (res_locked(fh)) {
+		dprintk(1, "can't change standard after started\n");
+		ret = -EBUSY;
+		goto out_s_std;
+	}
+	mode = fh->channel->mode;
+	if (*i & V4L2_STD_NTSC) {
+		dprintk(4, "%s NTSC\n", __func__);
+		/* if changing format, reset frame decimation/intervals */
+		if (mode.format != FORMAT_NTSC) {
+			mode.restart = 1;
+			mode.format = FORMAT_NTSC;
+			mode.fdec = FDEC_1;
+		}
+	} else if (*i & V4L2_STD_PAL) {
+		dprintk(4, "%s PAL\n", __func__);
+		if (mode.format != FORMAT_PAL) {
+			mode.restart = 1;
+			mode.format = FORMAT_PAL;
+			mode.fdec = FDEC_1;
+		}
+	} else {
+		ret = -EINVAL;
+	}
+	if (mode.restart)
+		s2255_set_mode(fh->channel, &mode);
+out_s_std:
+	mutex_unlock(&q->vb_lock);
+	return ret;
+}
+
+/* Sensoray 2255 is a multiple channel capture device.
+   It does not have a "crossbar" of inputs.
+   We use one V4L device per channel. The user must
+   be aware that certain combinations are not allowed.
+   For instance, you cannot do full FPS on more than 2 channels(2 videodevs)
+   at once in color(you can do full fps on 4 channels with greyscale.
+*/
+static int vidioc_enum_input(struct file *file, void *priv,
+			     struct v4l2_input *inp)
+{
+	struct s2255_fh *fh = priv;
+	struct s2255_dev *dev = fh->dev;
+	struct s2255_channel *channel = fh->channel;
+	u32 status = 0;
+	if (inp->index != 0)
+		return -EINVAL;
+	inp->type = V4L2_INPUT_TYPE_CAMERA;
+	inp->std = S2255_NORMS;
+	inp->status = 0;
+	if (dev->dsp_fw_ver >= S2255_MIN_DSP_STATUS) {
+		int rc;
+		rc = s2255_cmd_status(fh->channel, &status);
+		dprintk(4, "s2255_cmd_status rc: %d status %x\n", rc, status);
+		if (rc == 0)
+			inp->status =  (status & 0x01) ? 0
+				: V4L2_IN_ST_NO_SIGNAL;
+	}
+	switch (dev->pid) {
+	case 0x2255:
+	default:
+		strlcpy(inp->name, "Composite", sizeof(inp->name));
+		break;
+	case 0x2257:
+		strlcpy(inp->name, (channel->idx < 2) ? "Composite" : "S-Video",
+			sizeof(inp->name));
+		break;
+	}
+	return 0;
+}
+
+static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	*i = 0;
+	return 0;
+}
+static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
+{
+	if (i > 0)
+		return -EINVAL;
+	return 0;
+}
+
+/* --- controls ---------------------------------------------- */
+static int vidioc_queryctrl(struct file *file, void *priv,
+			    struct v4l2_queryctrl *qc)
+{
+	struct s2255_fh *fh = priv;
+	struct s2255_channel *channel = fh->channel;
+	struct s2255_dev *dev = fh->dev;
+	switch (qc->id) {
+	case V4L2_CID_BRIGHTNESS:
+		v4l2_ctrl_query_fill(qc, -127, 127, 1, DEF_BRIGHT);
+		break;
+	case V4L2_CID_CONTRAST:
+		v4l2_ctrl_query_fill(qc, 0, 255, 1, DEF_CONTRAST);
+		break;
+	case V4L2_CID_SATURATION:
+		v4l2_ctrl_query_fill(qc, 0, 255, 1, DEF_SATURATION);
+		break;
+	case V4L2_CID_HUE:
+		v4l2_ctrl_query_fill(qc, 0, 255, 1, DEF_HUE);
+		break;
+	case V4L2_CID_PRIVATE_COLORFILTER:
+		if (dev->dsp_fw_ver < S2255_MIN_DSP_COLORFILTER)
+			return -EINVAL;
+		if ((dev->pid == 0x2257) && (channel->idx > 1))
+			return -EINVAL;
+		strlcpy(qc->name, "Color Filter", sizeof(qc->name));
+		qc->type = V4L2_CTRL_TYPE_MENU;
+		qc->minimum = 0;
+		qc->maximum = 1;
+		qc->step = 1;
+		qc->default_value = 1;
+		qc->flags = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+	dprintk(4, "%s, id %d\n", __func__, qc->id);
+	return 0;
+}
+
+static int vidioc_g_ctrl(struct file *file, void *priv,
+			 struct v4l2_control *ctrl)
+{
+	struct s2255_fh *fh = priv;
+	struct s2255_dev *dev = fh->dev;
+	struct s2255_channel *channel = fh->channel;
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		ctrl->value = channel->mode.bright;
+		break;
+	case V4L2_CID_CONTRAST:
+		ctrl->value = channel->mode.contrast;
+		break;
+	case V4L2_CID_SATURATION:
+		ctrl->value = channel->mode.saturation;
+		break;
+	case V4L2_CID_HUE:
+		ctrl->value = channel->mode.hue;
+		break;
+	case V4L2_CID_PRIVATE_COLORFILTER:
+		if (dev->dsp_fw_ver < S2255_MIN_DSP_COLORFILTER)
+			return -EINVAL;
+		if ((dev->pid == 0x2257) && (channel->idx > 1))
+			return -EINVAL;
+		ctrl->value = !((channel->mode.color & MASK_INPUT_TYPE) >> 16);
+		break;
+	default:
+		return -EINVAL;
+	}
+	dprintk(4, "%s, id %d val %d\n", __func__, ctrl->id, ctrl->value);
+	return 0;
+}
+
+static int vidioc_s_ctrl(struct file *file, void *priv,
+			 struct v4l2_control *ctrl)
+{
+	struct s2255_fh *fh = priv;
+	struct s2255_channel *channel = fh->channel;
+	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
+	struct s2255_mode mode;
+	mode = channel->mode;
+	dprintk(4, "%s\n", __func__);
+	/* update the mode to the corresponding value */
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		mode.bright = ctrl->value;
+		break;
+	case V4L2_CID_CONTRAST:
+		mode.contrast = ctrl->value;
+		break;
+	case V4L2_CID_HUE:
+		mode.hue = ctrl->value;
+		break;
+	case V4L2_CID_SATURATION:
+		mode.saturation = ctrl->value;
+		break;
+	case V4L2_CID_PRIVATE_COLORFILTER:
+		if (dev->dsp_fw_ver < S2255_MIN_DSP_COLORFILTER)
+			return -EINVAL;
+		if ((dev->pid == 0x2257) && (channel->idx > 1))
+			return -EINVAL;
+		mode.color &= ~MASK_INPUT_TYPE;
+		mode.color |= ((ctrl->value ? 0 : 1) << 16);
+		break;
+	default:
+		return -EINVAL;
+	}
+	mode.restart = 0;
+	/* set mode here.  Note: stream does not need restarted.
+	   some V4L programs restart stream unnecessarily
+	   after a s_crtl.
+	*/
+	s2255_set_mode(fh->channel, &mode);
+	return 0;
+}
+
+static int vidioc_g_jpegcomp(struct file *file, void *priv,
+			 struct v4l2_jpegcompression *jc)
+{
+	struct s2255_fh *fh = priv;
+	struct s2255_channel *channel = fh->channel;
+	*jc = channel->jc;
+	dprintk(2, "%s: quality %d\n", __func__, jc->quality);
+	return 0;
+}
+
+static int vidioc_s_jpegcomp(struct file *file, void *priv,
+			 struct v4l2_jpegcompression *jc)
+{
+	struct s2255_fh *fh = priv;
+	struct s2255_channel *channel = fh->channel;
+	if (jc->quality < 0 || jc->quality > 100)
+		return -EINVAL;
+	channel->jc.quality = jc->quality;
+	dprintk(2, "%s: quality %d\n", __func__, jc->quality);
+	return 0;
+}
+
+static int vidioc_g_parm(struct file *file, void *priv,
+			 struct v4l2_streamparm *sp)
+{
+	struct s2255_fh *fh = priv;
+	__u32 def_num, def_dem;
+	struct s2255_channel *channel = fh->channel;
+	if (sp->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+	memset(sp, 0, sizeof(struct v4l2_streamparm));
+	sp->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+	sp->parm.capture.capturemode = channel->cap_parm.capturemode;
+	def_num = (channel->mode.format == FORMAT_NTSC) ? 1001 : 1000;
+	def_dem = (channel->mode.format == FORMAT_NTSC) ? 30000 : 25000;
+	sp->parm.capture.timeperframe.denominator = def_dem;
+	switch (channel->mode.fdec) {
+	default:
+	case FDEC_1:
+		sp->parm.capture.timeperframe.numerator = def_num;
+		break;
+	case FDEC_2:
+		sp->parm.capture.timeperframe.numerator = def_num * 2;
+		break;
+	case FDEC_3:
+		sp->parm.capture.timeperframe.numerator = def_num * 3;
+		break;
+	case FDEC_5:
+		sp->parm.capture.timeperframe.numerator = def_num * 5;
+		break;
+	}
+	dprintk(4, "%s capture mode, %d timeperframe %d/%d\n", __func__,
+		sp->parm.capture.capturemode,
+		sp->parm.capture.timeperframe.numerator,
+		sp->parm.capture.timeperframe.denominator);
+	return 0;
+}
+
+static int vidioc_s_parm(struct file *file, void *priv,
+			 struct v4l2_streamparm *sp)
+{
+	struct s2255_fh *fh = priv;
+	struct s2255_channel *channel = fh->channel;
+	struct s2255_mode mode;
+	int fdec = FDEC_1;
+	__u32 def_num, def_dem;
+	if (sp->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+	mode = channel->mode;
+	/* high quality capture mode requires a stream restart */
+	if (channel->cap_parm.capturemode
+	    != sp->parm.capture.capturemode && res_locked(fh))
+		return -EBUSY;
+	def_num = (mode.format == FORMAT_NTSC) ? 1001 : 1000;
+	def_dem = (mode.format == FORMAT_NTSC) ? 30000 : 25000;
+	if (def_dem != sp->parm.capture.timeperframe.denominator)
+		sp->parm.capture.timeperframe.numerator = def_num;
+	else if (sp->parm.capture.timeperframe.numerator <= def_num)
+		sp->parm.capture.timeperframe.numerator = def_num;
+	else if (sp->parm.capture.timeperframe.numerator <= (def_num * 2)) {
+		sp->parm.capture.timeperframe.numerator = def_num * 2;
+		fdec = FDEC_2;
+	} else if (sp->parm.capture.timeperframe.numerator <= (def_num * 3)) {
+		sp->parm.capture.timeperframe.numerator = def_num * 3;
+		fdec = FDEC_3;
+	} else {
+		sp->parm.capture.timeperframe.numerator = def_num * 5;
+		fdec = FDEC_5;
+	}
+	mode.fdec = fdec;
+	sp->parm.capture.timeperframe.denominator = def_dem;
+	s2255_set_mode(channel, &mode);
+	dprintk(4, "%s capture mode, %d timeperframe %d/%d, fdec %d\n",
+		__func__,
+		sp->parm.capture.capturemode,
+		sp->parm.capture.timeperframe.numerator,
+		sp->parm.capture.timeperframe.denominator, fdec);
+	return 0;
+}
+
+static int vidioc_enum_frameintervals(struct file *file, void *priv,
+			    struct v4l2_frmivalenum *fe)
+{
+	int is_ntsc = 0;
+#define NUM_FRAME_ENUMS 4
+	int frm_dec[NUM_FRAME_ENUMS] = {1, 2, 3, 5};
+	if (fe->index < 0 || fe->index >= NUM_FRAME_ENUMS)
+		return -EINVAL;
+	switch (fe->width) {
+	case 640:
+		if (fe->height != 240 && fe->height != 480)
+			return -EINVAL;
+		is_ntsc = 1;
+		break;
+	case 320:
+		if (fe->height != 240)
+			return -EINVAL;
+		is_ntsc = 1;
+		break;
+	case 704:
+		if (fe->height != 288 && fe->height != 576)
+			return -EINVAL;
+		break;
+	case 352:
+		if (fe->height != 288)
+			return -EINVAL;
+		break;
+	default:
+		return -EINVAL;
+	}
+	fe->type = V4L2_FRMIVAL_TYPE_DISCRETE;
+	fe->discrete.denominator = is_ntsc ? 30000 : 25000;
+	fe->discrete.numerator = (is_ntsc ? 1001 : 1000) * frm_dec[fe->index];
+	dprintk(4, "%s discrete %d/%d\n", __func__, fe->discrete.numerator,
+		fe->discrete.denominator);
+	return 0;
+}
+
+static int __s2255_open(struct file *file)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct s2255_channel *channel = video_drvdata(file);
+	struct s2255_dev *dev = to_s2255_dev(vdev->v4l2_dev);
+	struct s2255_fh *fh;
+	enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	int state;
+	dprintk(1, "s2255: open called (dev=%s)\n",
+		video_device_node_name(vdev));
+	state = atomic_read(&dev->fw_data->fw_state);
+	switch (state) {
+	case S2255_FW_DISCONNECTING:
+		return -ENODEV;
+	case S2255_FW_FAILED:
+		s2255_dev_err(&dev->udev->dev,
+			"firmware load failed. retrying.\n");
+		s2255_fwload_start(dev, 1);
+		wait_event_timeout(dev->fw_data->wait_fw,
+				   ((atomic_read(&dev->fw_data->fw_state)
+				     == S2255_FW_SUCCESS) ||
+				    (atomic_read(&dev->fw_data->fw_state)
+				     == S2255_FW_DISCONNECTING)),
+				   msecs_to_jiffies(S2255_LOAD_TIMEOUT));
+		/* state may have changed, re-read */
+		state = atomic_read(&dev->fw_data->fw_state);
+		break;
+	case S2255_FW_NOTLOADED:
+	case S2255_FW_LOADED_DSPWAIT:
+		/* give S2255_LOAD_TIMEOUT time for firmware to load in case
+		   driver loaded and then device immediately opened */
+		printk(KERN_INFO "%s waiting for firmware load\n", __func__);
+		wait_event_timeout(dev->fw_data->wait_fw,
+				   ((atomic_read(&dev->fw_data->fw_state)
+				     == S2255_FW_SUCCESS) ||
+				    (atomic_read(&dev->fw_data->fw_state)
+				     == S2255_FW_DISCONNECTING)),
+				   msecs_to_jiffies(S2255_LOAD_TIMEOUT));
+		/* state may have changed, re-read */
+		state = atomic_read(&dev->fw_data->fw_state);
+		break;
+	case S2255_FW_SUCCESS:
+	default:
+		break;
+	}
+	/* state may have changed in above switch statement */
+	switch (state) {
+	case S2255_FW_SUCCESS:
+		break;
+	case S2255_FW_FAILED:
+		printk(KERN_INFO "2255 firmware load failed.\n");
+		return -ENODEV;
+	case S2255_FW_DISCONNECTING:
+		printk(KERN_INFO "%s: disconnecting\n", __func__);
+		return -ENODEV;
+	case S2255_FW_LOADED_DSPWAIT:
+	case S2255_FW_NOTLOADED:
+		printk(KERN_INFO "%s: firmware not loaded yet"
+		       "please try again later\n",
+		       __func__);
+		/*
+		 * Timeout on firmware load means device unusable.
+		 * Set firmware failure state.
+		 * On next s2255_open the firmware will be reloaded.
+		 */
+		atomic_set(&dev->fw_data->fw_state,
+			   S2255_FW_FAILED);
+		return -EAGAIN;
+	default:
+		printk(KERN_INFO "%s: unknown state\n", __func__);
+		return -EFAULT;
+	}
+	/* allocate + initialize per filehandle data */
+	fh = kzalloc(sizeof(*fh), GFP_KERNEL);
+	if (NULL == fh)
+		return -ENOMEM;
+	file->private_data = fh;
+	fh->dev = dev;
+	fh->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	fh->channel = channel;
+	if (!channel->configured) {
+		/* configure channel to default state */
+		channel->fmt = &formats[0];
+		s2255_set_mode(channel, &channel->mode);
+		channel->configured = 1;
+	}
+	dprintk(1, "%s: dev=%s type=%s\n", __func__,
+		video_device_node_name(vdev), v4l2_type_names[type]);
+	dprintk(2, "%s: fh=0x%08lx, dev=0x%08lx, vidq=0x%08lx\n", __func__,
+		(unsigned long)fh, (unsigned long)dev,
+		(unsigned long)&channel->vidq);
+	dprintk(4, "%s: list_empty active=%d\n", __func__,
+		list_empty(&channel->vidq.active));
+	videobuf_queue_vmalloc_init(&fh->vb_vidq, &s2255_video_qops,
+				    NULL, &dev->slock,
+				    fh->type,
+				    V4L2_FIELD_INTERLACED,
+				    sizeof(struct s2255_buffer),
+				    fh, vdev->lock);
+	return 0;
+}
+
+static int s2255_open(struct file *file)
+{
+	struct video_device *vdev = video_devdata(file);
+	int ret;
+
+	if (mutex_lock_interruptible(vdev->lock))
+		return -ERESTARTSYS;
+	ret = __s2255_open(file);
+	mutex_unlock(vdev->lock);
+	return ret;
+}
+
+static unsigned int s2255_poll(struct file *file,
+			       struct poll_table_struct *wait)
+{
+	struct s2255_fh *fh = file->private_data;
+	struct s2255_dev *dev = fh->dev;
+	int rc;
+	dprintk(100, "%s\n", __func__);
+	if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
+		return POLLERR;
+	mutex_lock(&dev->lock);
+	rc = videobuf_poll_stream(file, &fh->vb_vidq, wait);
+	mutex_unlock(&dev->lock);
+	return rc;
+}
+
+static void s2255_destroy(struct s2255_dev *dev)
+{
+	/* board shutdown stops the read pipe if it is running */
+	s2255_board_shutdown(dev);
+	/* make sure firmware still not trying to load */
+	del_timer(&dev->timer);  /* only started in .probe and .open */
+	if (dev->fw_data->fw_urb) {
+		usb_kill_urb(dev->fw_data->fw_urb);
+		usb_free_urb(dev->fw_data->fw_urb);
+		dev->fw_data->fw_urb = NULL;
+	}
+	release_firmware(dev->fw_data->fw);
+	kfree(dev->fw_data->pfw_data);
+	kfree(dev->fw_data);
+	/* reset the DSP so firmware can be reloaded next time */
+	s2255_reset_dsppower(dev);
+	mutex_destroy(&dev->lock);
+	usb_put_dev(dev->udev);
+	v4l2_device_unregister(&dev->v4l2_dev);
+	dprintk(1, "%s", __func__);
+	kfree(dev);
+}
+
+static int s2255_release(struct file *file)
+{
+	struct s2255_fh *fh = file->private_data;
+	struct s2255_dev *dev = fh->dev;
+	struct video_device *vdev = video_devdata(file);
+	struct s2255_channel *channel = fh->channel;
+	if (!dev)
+		return -ENODEV;
+	mutex_lock(&dev->lock);
+	/* turn off stream */
+	if (res_check(fh)) {
+		if (channel->b_acquire)
+			s2255_stop_acquire(fh->channel);
+		videobuf_streamoff(&fh->vb_vidq);
+		res_free(fh);
+	}
+	videobuf_mmap_free(&fh->vb_vidq);
+	mutex_unlock(&dev->lock);
+	dprintk(1, "%s (dev=%s)\n", __func__, video_device_node_name(vdev));
+	kfree(fh);
+	return 0;
+}
+
+static int s2255_mmap_v4l(struct file *file, struct vm_area_struct *vma)
+{
+	struct s2255_fh *fh = file->private_data;
+	struct s2255_dev *dev = fh->dev;
+	int ret;
+
+	if (!fh)
+		return -ENODEV;
+	dprintk(4, "%s, vma=0x%08lx\n", __func__, (unsigned long)vma);
+	if (mutex_lock_interruptible(&dev->lock))
+		return -ERESTARTSYS;
+	ret = videobuf_mmap_mapper(&fh->vb_vidq, vma);
+	mutex_unlock(&dev->lock);
+	dprintk(4, "%s vma start=0x%08lx, size=%ld, ret=%d\n", __func__,
+		(unsigned long)vma->vm_start,
+		(unsigned long)vma->vm_end - (unsigned long)vma->vm_start, ret);
+	return ret;
+}
+
+static const struct v4l2_file_operations s2255_fops_v4l = {
+	.owner = THIS_MODULE,
+	.open = s2255_open,
+	.release = s2255_release,
+	.poll = s2255_poll,
+	.unlocked_ioctl = video_ioctl2,	/* V4L2 ioctl handler */
+	.mmap = s2255_mmap_v4l,
+};
+
+static const struct v4l2_ioctl_ops s2255_ioctl_ops = {
+	.vidioc_querymenu = vidioc_querymenu,
+	.vidioc_querycap = vidioc_querycap,
+	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
+	.vidioc_reqbufs = vidioc_reqbufs,
+	.vidioc_querybuf = vidioc_querybuf,
+	.vidioc_qbuf = vidioc_qbuf,
+	.vidioc_dqbuf = vidioc_dqbuf,
+	.vidioc_s_std = vidioc_s_std,
+	.vidioc_enum_input = vidioc_enum_input,
+	.vidioc_g_input = vidioc_g_input,
+	.vidioc_s_input = vidioc_s_input,
+	.vidioc_queryctrl = vidioc_queryctrl,
+	.vidioc_g_ctrl = vidioc_g_ctrl,
+	.vidioc_s_ctrl = vidioc_s_ctrl,
+	.vidioc_streamon = vidioc_streamon,
+	.vidioc_streamoff = vidioc_streamoff,
+	.vidioc_s_jpegcomp = vidioc_s_jpegcomp,
+	.vidioc_g_jpegcomp = vidioc_g_jpegcomp,
+	.vidioc_s_parm = vidioc_s_parm,
+	.vidioc_g_parm = vidioc_g_parm,
+	.vidioc_enum_frameintervals = vidioc_enum_frameintervals,
+};
+
+static void s2255_video_device_release(struct video_device *vdev)
+{
+	struct s2255_dev *dev = to_s2255_dev(vdev->v4l2_dev);
+	dprintk(4, "%s, chnls: %d \n", __func__,
+		atomic_read(&dev->num_channels));
+	if (atomic_dec_and_test(&dev->num_channels))
+		s2255_destroy(dev);
+	return;
+}
+
+static struct video_device template = {
+	.name = "s2255v",
+	.fops = &s2255_fops_v4l,
+	.ioctl_ops = &s2255_ioctl_ops,
+	.release = s2255_video_device_release,
+	.tvnorms = S2255_NORMS,
+	.current_norm = V4L2_STD_NTSC_M,
+};
+
+static int s2255_probe_v4l(struct s2255_dev *dev)
+{
+	int ret;
+	int i;
+	int cur_nr = video_nr;
+	struct s2255_channel *channel;
+	ret = v4l2_device_register(&dev->interface->dev, &dev->v4l2_dev);
+	if (ret)
+		return ret;
+	/* initialize all video 4 linux */
+	/* register 4 video devices */
+	for (i = 0; i < MAX_CHANNELS; i++) {
+		channel = &dev->channel[i];
+		INIT_LIST_HEAD(&channel->vidq.active);
+		channel->vidq.dev = dev;
+		/* register 4 video devices */
+		channel->vdev = template;
+		channel->vdev.lock = &dev->lock;
+		channel->vdev.v4l2_dev = &dev->v4l2_dev;
+		video_set_drvdata(&channel->vdev, channel);
+		if (video_nr == -1)
+			ret = video_register_device(&channel->vdev,
+						    VFL_TYPE_GRABBER,
+						    video_nr);
+		else
+			ret = video_register_device(&channel->vdev,
+						    VFL_TYPE_GRABBER,
+						    cur_nr + i);
+
+		if (ret) {
+			dev_err(&dev->udev->dev,
+				"failed to register video device!\n");
+			break;
+		}
+		atomic_inc(&dev->num_channels);
+		v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
+			  video_device_node_name(&channel->vdev));
+
+	}
+	printk(KERN_INFO "Sensoray 2255 V4L driver Revision: %s\n",
+	       S2255_VERSION);
+	/* if no channels registered, return error and probe will fail*/
+	if (atomic_read(&dev->num_channels) == 0) {
+		v4l2_device_unregister(&dev->v4l2_dev);
+		return ret;
+	}
+	if (atomic_read(&dev->num_channels) != MAX_CHANNELS)
+		printk(KERN_WARNING "s2255: Not all channels available.\n");
+	return 0;
+}
+
+/* this function moves the usb stream read pipe data
+ * into the system buffers.
+ * returns 0 on success, EAGAIN if more data to process( call this
+ * function again).
+ *
+ * Received frame structure:
+ * bytes 0-3:  marker : 0x2255DA4AL (S2255_MARKER_FRAME)
+ * bytes 4-7:  channel: 0-3
+ * bytes 8-11: payload size:  size of the frame
+ * bytes 12-payloadsize+12:  frame data
+ */
+static int save_frame(struct s2255_dev *dev, struct s2255_pipeinfo *pipe_info)
+{
+	char *pdest;
+	u32 offset = 0;
+	int bframe = 0;
+	char *psrc;
+	unsigned long copy_size;
+	unsigned long size;
+	s32 idx = -1;
+	struct s2255_framei *frm;
+	unsigned char *pdata;
+	struct s2255_channel *channel;
+	dprintk(100, "buffer to user\n");
+	channel = &dev->channel[dev->cc];
+	idx = channel->cur_frame;
+	frm = &channel->buffer.frame[idx];
+	if (frm->ulState == S2255_READ_IDLE) {
+		int jj;
+		unsigned int cc;
+		__le32 *pdword; /*data from dsp is little endian */
+		int payload;
+		/* search for marker codes */
+		pdata = (unsigned char *)pipe_info->transfer_buffer;
+		pdword = (__le32 *)pdata;
+		for (jj = 0; jj < (pipe_info->cur_transfer_size - 12); jj++) {
+			switch (*pdword) {
+			case S2255_MARKER_FRAME:
+				dprintk(4, "found frame marker at offset:"
+					" %d [%x %x]\n", jj, pdata[0],
+					pdata[1]);
+				offset = jj + PREFIX_SIZE;
+				bframe = 1;
+				cc = le32_to_cpu(pdword[1]);
+				if (cc >= MAX_CHANNELS) {
+					printk(KERN_ERR
+					       "bad channel\n");
+					return -EINVAL;
+				}
+				/* reverse it */
+				dev->cc = G_chnmap[cc];
+				channel = &dev->channel[dev->cc];
+				payload =  le32_to_cpu(pdword[3]);
+				if (payload > channel->req_image_size) {
+					channel->bad_payload++;
+					/* discard the bad frame */
+					return -EINVAL;
+				}
+				channel->pkt_size = payload;
+				channel->jpg_size = le32_to_cpu(pdword[4]);
+				break;
+			case S2255_MARKER_RESPONSE:
+
+				pdata += DEF_USB_BLOCK;
+				jj += DEF_USB_BLOCK;
+				if (le32_to_cpu(pdword[1]) >= MAX_CHANNELS)
+					break;
+				cc = G_chnmap[le32_to_cpu(pdword[1])];
+				if (cc >= MAX_CHANNELS)
+					break;
+				channel = &dev->channel[cc];
+				switch (pdword[2]) {
+				case S2255_RESPONSE_SETMODE:
+					/* check if channel valid */
+					/* set mode ready */
+					channel->setmode_ready = 1;
+					wake_up(&channel->wait_setmode);
+					dprintk(5, "setmode ready %d\n", cc);
+					break;
+				case S2255_RESPONSE_FW:
+					dev->chn_ready |= (1 << cc);
+					if ((dev->chn_ready & 0x0f) != 0x0f)
+						break;
+					/* all channels ready */
+					printk(KERN_INFO "s2255: fw loaded\n");
+					atomic_set(&dev->fw_data->fw_state,
+						   S2255_FW_SUCCESS);
+					wake_up(&dev->fw_data->wait_fw);
+					break;
+				case S2255_RESPONSE_STATUS:
+					channel->vidstatus = le32_to_cpu(pdword[3]);
+					channel->vidstatus_ready = 1;
+					wake_up(&channel->wait_vidstatus);
+					dprintk(5, "got vidstatus %x chan %d\n",
+						le32_to_cpu(pdword[3]), cc);
+					break;
+				default:
+					printk(KERN_INFO "s2255 unknown resp\n");
+				}
+			default:
+				pdata++;
+				break;
+			}
+			if (bframe)
+				break;
+		} /* for */
+		if (!bframe)
+			return -EINVAL;
+	}
+	channel = &dev->channel[dev->cc];
+	idx = channel->cur_frame;
+	frm = &channel->buffer.frame[idx];
+	/* search done.  now find out if should be acquiring on this channel */
+	if (!channel->b_acquire) {
+		/* we found a frame, but this channel is turned off */
+		frm->ulState = S2255_READ_IDLE;
+		return -EINVAL;
+	}
+
+	if (frm->ulState == S2255_READ_IDLE) {
+		frm->ulState = S2255_READ_FRAME;
+		frm->cur_size = 0;
+	}
+
+	/* skip the marker 512 bytes (and offset if out of sync) */
+	psrc = (u8 *)pipe_info->transfer_buffer + offset;
+
+
+	if (frm->lpvbits == NULL) {
+		dprintk(1, "s2255 frame buffer == NULL.%p %p %d %d",
+			frm, dev, dev->cc, idx);
+		return -ENOMEM;
+	}
+
+	pdest = frm->lpvbits + frm->cur_size;
+
+	copy_size = (pipe_info->cur_transfer_size - offset);
+
+	size = channel->pkt_size - PREFIX_SIZE;
+
+	/* sanity check on pdest */
+	if ((copy_size + frm->cur_size) < channel->req_image_size)
+		memcpy(pdest, psrc, copy_size);
+
+	frm->cur_size += copy_size;
+	dprintk(4, "cur_size size %lu size %lu \n", frm->cur_size, size);
+
+	if (frm->cur_size >= size) {
+		dprintk(2, "****************[%d]Buffer[%d]full*************\n",
+			dev->cc, idx);
+		channel->last_frame = channel->cur_frame;
+		channel->cur_frame++;
+		/* end of system frame ring buffer, start at zero */
+		if ((channel->cur_frame == SYS_FRAMES) ||
+		    (channel->cur_frame == channel->buffer.dwFrames))
+			channel->cur_frame = 0;
+		/* frame ready */
+		if (channel->b_acquire)
+			s2255_got_frame(channel, channel->jpg_size);
+		channel->frame_count++;
+		frm->ulState = S2255_READ_IDLE;
+		frm->cur_size = 0;
+
+	}
+	/* done successfully */
+	return 0;
+}
+
+static void s2255_read_video_callback(struct s2255_dev *dev,
+				      struct s2255_pipeinfo *pipe_info)
+{
+	int res;
+	dprintk(50, "callback read video \n");
+
+	if (dev->cc >= MAX_CHANNELS) {
+		dev->cc = 0;
+		dev_err(&dev->udev->dev, "invalid channel\n");
+		return;
+	}
+	/* otherwise copy to the system buffers */
+	res = save_frame(dev, pipe_info);
+	if (res != 0)
+		dprintk(4, "s2255: read callback failed\n");
+
+	dprintk(50, "callback read video done\n");
+	return;
+}
+
+static long s2255_vendor_req(struct s2255_dev *dev, unsigned char Request,
+			     u16 Index, u16 Value, void *TransferBuffer,
+			     s32 TransferBufferLength, int bOut)
+{
+	int r;
+	if (!bOut) {
+		r = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
+				    Request,
+				    USB_TYPE_VENDOR | USB_RECIP_DEVICE |
+				    USB_DIR_IN,
+				    Value, Index, TransferBuffer,
+				    TransferBufferLength, HZ * 5);
+	} else {
+		r = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
+				    Request, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+				    Value, Index, TransferBuffer,
+				    TransferBufferLength, HZ * 5);
+	}
+	return r;
+}
+
+/*
+ * retrieve FX2 firmware version. future use.
+ * @param dev pointer to device extension
+ * @return -1 for fail, else returns firmware version as an int(16 bits)
+ */
+static int s2255_get_fx2fw(struct s2255_dev *dev)
+{
+	int fw;
+	int ret;
+	unsigned char transBuffer[64];
+	ret = s2255_vendor_req(dev, S2255_VR_FW, 0, 0, transBuffer, 2,
+			       S2255_VR_IN);
+	if (ret < 0)
+		dprintk(2, "get fw error: %x\n", ret);
+	fw = transBuffer[0] + (transBuffer[1] << 8);
+	dprintk(2, "Get FW %x %x\n", transBuffer[0], transBuffer[1]);
+	return fw;
+}
+
+/*
+ * Create the system ring buffer to copy frames into from the
+ * usb read pipe.
+ */
+static int s2255_create_sys_buffers(struct s2255_channel *channel)
+{
+	unsigned long i;
+	unsigned long reqsize;
+	dprintk(1, "create sys buffers\n");
+	channel->buffer.dwFrames = SYS_FRAMES;
+	/* always allocate maximum size(PAL) for system buffers */
+	reqsize = SYS_FRAMES_MAXSIZE;
+
+	if (reqsize > SYS_FRAMES_MAXSIZE)
+		reqsize = SYS_FRAMES_MAXSIZE;
+
+	for (i = 0; i < SYS_FRAMES; i++) {
+		/* allocate the frames */
+		channel->buffer.frame[i].lpvbits = vmalloc(reqsize);
+		dprintk(1, "valloc %p chan %d, idx %lu, pdata %p\n",
+			&channel->buffer.frame[i], channel->idx, i,
+			channel->buffer.frame[i].lpvbits);
+		channel->buffer.frame[i].size = reqsize;
+		if (channel->buffer.frame[i].lpvbits == NULL) {
+			printk(KERN_INFO "out of memory.  using less frames\n");
+			channel->buffer.dwFrames = i;
+			break;
+		}
+	}
+
+	/* make sure internal states are set */
+	for (i = 0; i < SYS_FRAMES; i++) {
+		channel->buffer.frame[i].ulState = 0;
+		channel->buffer.frame[i].cur_size = 0;
+	}
+
+	channel->cur_frame = 0;
+	channel->last_frame = -1;
+	return 0;
+}
+
+static int s2255_release_sys_buffers(struct s2255_channel *channel)
+{
+	unsigned long i;
+	dprintk(1, "release sys buffers\n");
+	for (i = 0; i < SYS_FRAMES; i++) {
+		if (channel->buffer.frame[i].lpvbits) {
+			dprintk(1, "vfree %p\n",
+				channel->buffer.frame[i].lpvbits);
+			vfree(channel->buffer.frame[i].lpvbits);
+		}
+		channel->buffer.frame[i].lpvbits = NULL;
+	}
+	return 0;
+}
+
+static int s2255_board_init(struct s2255_dev *dev)
+{
+	struct s2255_mode mode_def = DEF_MODEI_NTSC_CONT;
+	int fw_ver;
+	int j;
+	struct s2255_pipeinfo *pipe = &dev->pipe;
+	dprintk(4, "board init: %p", dev);
+	memset(pipe, 0, sizeof(*pipe));
+	pipe->dev = dev;
+	pipe->cur_transfer_size = S2255_USB_XFER_SIZE;
+	pipe->max_transfer_size = S2255_USB_XFER_SIZE;
+
+	pipe->transfer_buffer = kzalloc(pipe->max_transfer_size,
+					GFP_KERNEL);
+	if (pipe->transfer_buffer == NULL) {
+		dprintk(1, "out of memory!\n");
+		return -ENOMEM;
+	}
+	/* query the firmware */
+	fw_ver = s2255_get_fx2fw(dev);
+
+	printk(KERN_INFO "s2255: usb firmware version %d.%d\n",
+	       (fw_ver >> 8) & 0xff,
+	       fw_ver & 0xff);
+
+	if (fw_ver < S2255_CUR_USB_FWVER)
+		printk(KERN_INFO "s2255: newer USB firmware available\n");
+
+	for (j = 0; j < MAX_CHANNELS; j++) {
+		struct s2255_channel *channel = &dev->channel[j];
+		channel->b_acquire = 0;
+		channel->mode = mode_def;
+		if (dev->pid == 0x2257 && j > 1)
+			channel->mode.color |= (1 << 16);
+		channel->jc.quality = S2255_DEF_JPEG_QUAL;
+		channel->width = LINE_SZ_4CIFS_NTSC;
+		channel->height = NUM_LINES_4CIFS_NTSC * 2;
+		channel->fmt = &formats[0];
+		channel->mode.restart = 1;
+		channel->req_image_size = get_transfer_size(&mode_def);
+		channel->frame_count = 0;
+		/* create the system buffers */
+		s2255_create_sys_buffers(channel);
+	}
+	/* start read pipe */
+	s2255_start_readpipe(dev);
+	dprintk(1, "%s: success\n", __func__);
+	return 0;
+}
+
+static int s2255_board_shutdown(struct s2255_dev *dev)
+{
+	u32 i;
+	dprintk(1, "%s: dev: %p", __func__,  dev);
+
+	for (i = 0; i < MAX_CHANNELS; i++) {
+		if (dev->channel[i].b_acquire)
+			s2255_stop_acquire(&dev->channel[i]);
+	}
+	s2255_stop_readpipe(dev);
+	for (i = 0; i < MAX_CHANNELS; i++)
+		s2255_release_sys_buffers(&dev->channel[i]);
+	/* release transfer buffer */
+	kfree(dev->pipe.transfer_buffer);
+	return 0;
+}
+
+static void read_pipe_completion(struct urb *purb)
+{
+	struct s2255_pipeinfo *pipe_info;
+	struct s2255_dev *dev;
+	int status;
+	int pipe;
+	pipe_info = purb->context;
+	dprintk(100, "%s: urb:%p, status %d\n", __func__, purb,
+		purb->status);
+	if (pipe_info == NULL) {
+		dev_err(&purb->dev->dev, "no context!\n");
+		return;
+	}
+
+	dev = pipe_info->dev;
+	if (dev == NULL) {
+		dev_err(&purb->dev->dev, "no context!\n");
+		return;
+	}
+	status = purb->status;
+	/* if shutting down, do not resubmit, exit immediately */
+	if (status == -ESHUTDOWN) {
+		dprintk(2, "%s: err shutdown\n", __func__);
+		pipe_info->err_count++;
+		return;
+	}
+
+	if (pipe_info->state == 0) {
+		dprintk(2, "%s: exiting USB pipe", __func__);
+		return;
+	}
+
+	if (status == 0)
+		s2255_read_video_callback(dev, pipe_info);
+	else {
+		pipe_info->err_count++;
+		dprintk(1, "%s: failed URB %d\n", __func__, status);
+	}
+
+	pipe = usb_rcvbulkpipe(dev->udev, dev->read_endpoint);
+	/* reuse urb */
+	usb_fill_bulk_urb(pipe_info->stream_urb, dev->udev,
+			  pipe,
+			  pipe_info->transfer_buffer,
+			  pipe_info->cur_transfer_size,
+			  read_pipe_completion, pipe_info);
+
+	if (pipe_info->state != 0) {
+		if (usb_submit_urb(pipe_info->stream_urb, GFP_ATOMIC)) {
+			dev_err(&dev->udev->dev, "error submitting urb\n");
+		}
+	} else {
+		dprintk(2, "%s :complete state 0\n", __func__);
+	}
+	return;
+}
+
+static int s2255_start_readpipe(struct s2255_dev *dev)
+{
+	int pipe;
+	int retval;
+	struct s2255_pipeinfo *pipe_info = &dev->pipe;
+	pipe = usb_rcvbulkpipe(dev->udev, dev->read_endpoint);
+	dprintk(2, "%s: IN %d\n", __func__, dev->read_endpoint);
+	pipe_info->state = 1;
+	pipe_info->err_count = 0;
+	pipe_info->stream_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!pipe_info->stream_urb) {
+		dev_err(&dev->udev->dev,
+			"ReadStream: Unable to alloc URB\n");
+		return -ENOMEM;
+	}
+	/* transfer buffer allocated in board_init */
+	usb_fill_bulk_urb(pipe_info->stream_urb, dev->udev,
+			  pipe,
+			  pipe_info->transfer_buffer,
+			  pipe_info->cur_transfer_size,
+			  read_pipe_completion, pipe_info);
+	retval = usb_submit_urb(pipe_info->stream_urb, GFP_KERNEL);
+	if (retval) {
+		printk(KERN_ERR "s2255: start read pipe failed\n");
+		return retval;
+	}
+	return 0;
+}
+
+/* starts acquisition process */
+static int s2255_start_acquire(struct s2255_channel *channel)
+{
+	unsigned char *buffer;
+	int res;
+	unsigned long chn_rev;
+	int j;
+	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
+	chn_rev = G_chnmap[channel->idx];
+	buffer = kzalloc(512, GFP_KERNEL);
+	if (buffer == NULL) {
+		dev_err(&dev->udev->dev, "out of mem\n");
+		return -ENOMEM;
+	}
+
+	channel->last_frame = -1;
+	channel->bad_payload = 0;
+	channel->cur_frame = 0;
+	for (j = 0; j < SYS_FRAMES; j++) {
+		channel->buffer.frame[j].ulState = 0;
+		channel->buffer.frame[j].cur_size = 0;
+	}
+
+	/* send the start command */
+	*(__le32 *) buffer = IN_DATA_TOKEN;
+	*((__le32 *) buffer + 1) = (__le32) cpu_to_le32(chn_rev);
+	*((__le32 *) buffer + 2) = CMD_START;
+	res = s2255_write_config(dev->udev, (unsigned char *)buffer, 512);
+	if (res != 0)
+		dev_err(&dev->udev->dev, "CMD_START error\n");
+
+	dprintk(2, "start acquire exit[%d] %d \n", channel->idx, res);
+	kfree(buffer);
+	return 0;
+}
+
+static int s2255_stop_acquire(struct s2255_channel *channel)
+{
+	unsigned char *buffer;
+	int res;
+	unsigned long chn_rev;
+	struct s2255_dev *dev = to_s2255_dev(channel->vdev.v4l2_dev);
+	chn_rev = G_chnmap[channel->idx];
+	buffer = kzalloc(512, GFP_KERNEL);
+	if (buffer == NULL) {
+		dev_err(&dev->udev->dev, "out of mem\n");
+		return -ENOMEM;
+	}
+	/* send the stop command */
+	*(__le32 *) buffer = IN_DATA_TOKEN;
+	*((__le32 *) buffer + 1) = (__le32) cpu_to_le32(chn_rev);
+	*((__le32 *) buffer + 2) = CMD_STOP;
+	res = s2255_write_config(dev->udev, (unsigned char *)buffer, 512);
+	if (res != 0)
+		dev_err(&dev->udev->dev, "CMD_STOP error\n");
+	kfree(buffer);
+	channel->b_acquire = 0;
+	dprintk(4, "%s: chn %d, res %d\n", __func__, channel->idx, res);
+	return res;
+}
+
+static void s2255_stop_readpipe(struct s2255_dev *dev)
+{
+	struct s2255_pipeinfo *pipe = &dev->pipe;
+
+	pipe->state = 0;
+	if (pipe->stream_urb) {
+		/* cancel urb */
+		usb_kill_urb(pipe->stream_urb);
+		usb_free_urb(pipe->stream_urb);
+		pipe->stream_urb = NULL;
+	}
+	dprintk(4, "%s", __func__);
+	return;
+}
+
+static void s2255_fwload_start(struct s2255_dev *dev, int reset)
+{
+	if (reset)
+		s2255_reset_dsppower(dev);
+	dev->fw_data->fw_size = dev->fw_data->fw->size;
+	atomic_set(&dev->fw_data->fw_state, S2255_FW_NOTLOADED);
+	memcpy(dev->fw_data->pfw_data,
+	       dev->fw_data->fw->data, CHUNK_SIZE);
+	dev->fw_data->fw_loaded = CHUNK_SIZE;
+	usb_fill_bulk_urb(dev->fw_data->fw_urb, dev->udev,
+			  usb_sndbulkpipe(dev->udev, 2),
+			  dev->fw_data->pfw_data,
+			  CHUNK_SIZE, s2255_fwchunk_complete,
+			  dev->fw_data);
+	mod_timer(&dev->timer, jiffies + HZ);
+}
+
+/* standard usb probe function */
+static int s2255_probe(struct usb_interface *interface,
+		       const struct usb_device_id *id)
+{
+	struct s2255_dev *dev = NULL;
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	int i;
+	int retval = -ENOMEM;
+	__le32 *pdata;
+	int fw_size;
+	dprintk(2, "%s\n", __func__);
+	/* allocate memory for our device state and initialize it to zero */
+	dev = kzalloc(sizeof(struct s2255_dev), GFP_KERNEL);
+	if (dev == NULL) {
+		s2255_dev_err(&interface->dev, "out of memory\n");
+		return -ENOMEM;
+	}
+	atomic_set(&dev->num_channels, 0);
+	dev->pid = id->idProduct;
+	dev->fw_data = kzalloc(sizeof(struct s2255_fw), GFP_KERNEL);
+	if (!dev->fw_data)
+		goto errorFWDATA1;
+	mutex_init(&dev->lock);
+	/* grab usb_device and save it */
+	dev->udev = usb_get_dev(interface_to_usbdev(interface));
+	if (dev->udev == NULL) {
+		dev_err(&interface->dev, "null usb device\n");
+		retval = -ENODEV;
+		goto errorUDEV;
+	}
+	dprintk(1, "dev: %p, udev %p interface %p\n", dev,
+		dev->udev, interface);
+	dev->interface = interface;
+	/* set up the endpoint information  */
+	iface_desc = interface->cur_altsetting;
+	dprintk(1, "num endpoints %d\n", iface_desc->desc.bNumEndpoints);
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		endpoint = &iface_desc->endpoint[i].desc;
+		if (!dev->read_endpoint && usb_endpoint_is_bulk_in(endpoint)) {
+			/* we found the bulk in endpoint */
+			dev->read_endpoint = endpoint->bEndpointAddress;
+		}
+	}
+
+	if (!dev->read_endpoint) {
+		dev_err(&interface->dev, "Could not find bulk-in endpoint\n");
+		goto errorEP;
+	}
+	init_timer(&dev->timer);
+	dev->timer.function = s2255_timer;
+	dev->timer.data = (unsigned long)dev->fw_data;
+	init_waitqueue_head(&dev->fw_data->wait_fw);
+	for (i = 0; i < MAX_CHANNELS; i++) {
+		struct s2255_channel *channel = &dev->channel[i];
+		dev->channel[i].idx = i;
+		init_waitqueue_head(&channel->wait_setmode);
+		init_waitqueue_head(&channel->wait_vidstatus);
+	}
+
+	dev->fw_data->fw_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!dev->fw_data->fw_urb) {
+		dev_err(&interface->dev, "out of memory!\n");
+		goto errorFWURB;
+	}
+
+	dev->fw_data->pfw_data = kzalloc(CHUNK_SIZE, GFP_KERNEL);
+	if (!dev->fw_data->pfw_data) {
+		dev_err(&interface->dev, "out of memory!\n");
+		goto errorFWDATA2;
+	}
+	/* load the first chunk */
+	if (request_firmware(&dev->fw_data->fw,
+			     FIRMWARE_FILE_NAME, &dev->udev->dev)) {
+		printk(KERN_ERR "sensoray 2255 failed to get firmware\n");
+		goto errorREQFW;
+	}
+	/* check the firmware is valid */
+	fw_size = dev->fw_data->fw->size;
+	pdata = (__le32 *) &dev->fw_data->fw->data[fw_size - 8];
+
+	if (*pdata != S2255_FW_MARKER) {
+		printk(KERN_INFO "Firmware invalid.\n");
+		retval = -ENODEV;
+		goto errorFWMARKER;
+	} else {
+		/* make sure firmware is the latest */
+		__le32 *pRel;
+		pRel = (__le32 *) &dev->fw_data->fw->data[fw_size - 4];
+		printk(KERN_INFO "s2255 dsp fw version %x\n", *pRel);
+		dev->dsp_fw_ver = le32_to_cpu(*pRel);
+		if (dev->dsp_fw_ver < S2255_CUR_DSP_FWVER)
+			printk(KERN_INFO "s2255: f2255usb.bin out of date.\n");
+		if (dev->pid == 0x2257 &&
+				dev->dsp_fw_ver < S2255_MIN_DSP_COLORFILTER)
+			printk(KERN_WARNING "s2255: 2257 requires firmware %d"
+			       " or above.\n", S2255_MIN_DSP_COLORFILTER);
+	}
+	usb_reset_device(dev->udev);
+	/* load 2255 board specific */
+	retval = s2255_board_init(dev);
+	if (retval)
+		goto errorBOARDINIT;
+	spin_lock_init(&dev->slock);
+	s2255_fwload_start(dev, 0);
+	/* loads v4l specific */
+	retval = s2255_probe_v4l(dev);
+	if (retval)
+		goto errorBOARDINIT;
+	dev_info(&interface->dev, "Sensoray 2255 detected\n");
+	return 0;
+errorBOARDINIT:
+	s2255_board_shutdown(dev);
+errorFWMARKER:
+	release_firmware(dev->fw_data->fw);
+errorREQFW:
+	kfree(dev->fw_data->pfw_data);
+errorFWDATA2:
+	usb_free_urb(dev->fw_data->fw_urb);
+errorFWURB:
+	del_timer(&dev->timer);
+errorEP:
+	usb_put_dev(dev->udev);
+errorUDEV:
+	kfree(dev->fw_data);
+	mutex_destroy(&dev->lock);
+errorFWDATA1:
+	kfree(dev);
+	printk(KERN_WARNING "Sensoray 2255 driver load failed: 0x%x\n", retval);
+	return retval;
+}
+
+/* disconnect routine. when board is removed physically or with rmmod */
+static void s2255_disconnect(struct usb_interface *interface)
+{
+	struct s2255_dev *dev = to_s2255_dev(usb_get_intfdata(interface));
+	int i;
+	int channels = atomic_read(&dev->num_channels);
+	mutex_lock(&dev->lock);
+	v4l2_device_disconnect(&dev->v4l2_dev);
+	mutex_unlock(&dev->lock);
+	/*see comments in the uvc_driver.c usb disconnect function */
+	atomic_inc(&dev->num_channels);
+	/* unregister each video device. */
+	for (i = 0; i < channels; i++)
+		video_unregister_device(&dev->channel[i].vdev);
+	/* wake up any of our timers */
+	atomic_set(&dev->fw_data->fw_state, S2255_FW_DISCONNECTING);
+	wake_up(&dev->fw_data->wait_fw);
+	for (i = 0; i < MAX_CHANNELS; i++) {
+		dev->channel[i].setmode_ready = 1;
+		wake_up(&dev->channel[i].wait_setmode);
+		dev->channel[i].vidstatus_ready = 1;
+		wake_up(&dev->channel[i].wait_vidstatus);
+	}
+	if (atomic_dec_and_test(&dev->num_channels))
+		s2255_destroy(dev);
+	dev_info(&interface->dev, "%s\n", __func__);
+}
+
+static struct usb_driver s2255_driver = {
+	.name = S2255_DRIVER_NAME,
+	.probe = s2255_probe,
+	.disconnect = s2255_disconnect,
+	.id_table = s2255_table,
+};
+
+module_usb_driver(s2255_driver);
+
+MODULE_DESCRIPTION("Sensoray 2255 Video for Linux driver");
+MODULE_AUTHOR("Dean Anderson (Sensoray Company Inc.)");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(S2255_VERSION);
+MODULE_FIRMWARE(FIRMWARE_FILE_NAME);