cx231xx-core.c

/*
   cx231xx-core.c - driver for Conexant Cx23100/101/102 USB video capture devices

   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
        Based on em28xx driver

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>
#include <media/v4l2-common.h>

#include "cx231xx.h"
#include "cx231xx-reg.h"

/* #define ENABLE_DEBUG_ISOC_FRAMES */

static unsigned int core_debug;
module_param(core_debug,int,0644);
MODULE_PARM_DESC(core_debug,"enable debug messages [core]");

#define cx231xx_coredbg(fmt, arg...) do {\
	if (core_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __func__ , ##arg); } while (0)

static unsigned int reg_debug;
module_param(reg_debug,int,0644);
MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");

#define cx231xx_regdbg(fmt, arg...) do {\
	if (reg_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __func__ , ##arg); } while (0)

static int alt = CX231XX_PINOUT;
module_param(alt, int, 0644);
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");

/* FIXME */
#define cx231xx_isocdbg(fmt, arg...) do {\
	if (core_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __func__ , ##arg); } while (0)



/************************************************************************************
*                              Device control list functions                        *
*************************************************************************************/

static LIST_HEAD(cx231xx_devlist);
static DEFINE_MUTEX(cx231xx_devlist_mutex);

struct cx231xx *cx231xx_get_device(int minor,
				 enum v4l2_buf_type *fh_type,
				 int *has_radio)
{
	struct cx231xx *h, *dev = NULL;

	*fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	*has_radio = 0;

	mutex_lock(&cx231xx_devlist_mutex);
	list_for_each_entry(h, &cx231xx_devlist, devlist) {
		if (h->vdev->minor == minor)
			dev = h;
		if (h->vbi_dev->minor == minor) {
			dev = h;
			*fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
		}
		if (h->radio_dev &&
		    h->radio_dev->minor == minor) {
			dev = h;
			*has_radio = 1;
		}
	}
	mutex_unlock(&cx231xx_devlist_mutex);

	return dev;
}

/*
 * cx231xx_realease_resources()
 * unregisters the v4l2,i2c and usb devices
 * called when the device gets disconected or at module unload
*/
void cx231xx_remove_from_devlist(struct cx231xx *dev)
{
	mutex_lock(&cx231xx_devlist_mutex);
	list_del(&dev->devlist);
	mutex_unlock(&cx231xx_devlist_mutex);
};

void cx231xx_add_into_devlist(struct cx231xx *dev)
{
	mutex_lock(&cx231xx_devlist_mutex);
	list_add_tail(&dev->devlist, &cx231xx_devlist);
	mutex_unlock(&cx231xx_devlist_mutex);
};




static LIST_HEAD(cx231xx_extension_devlist);
static DEFINE_MUTEX(cx231xx_extension_devlist_lock);

int cx231xx_register_extension(struct cx231xx_ops *ops)
{
	struct cx231xx *dev = NULL;

	mutex_lock(&cx231xx_devlist_mutex);
	mutex_lock(&cx231xx_extension_devlist_lock);
	list_add_tail(&ops->next, &cx231xx_extension_devlist);
	list_for_each_entry(dev, &cx231xx_devlist, devlist) {
		if (dev)
			ops->init(dev);
	}
	cx231xx_info("Cx231xx: Initialized (%s) extension\n", ops->name);
	mutex_unlock(&cx231xx_extension_devlist_lock);
	mutex_unlock(&cx231xx_devlist_mutex);
	return 0;
}
EXPORT_SYMBOL(cx231xx_register_extension);

void cx231xx_unregister_extension(struct cx231xx_ops *ops)
{
	struct cx231xx *dev = NULL;

	mutex_lock(&cx231xx_devlist_mutex);
	list_for_each_entry(dev, &cx231xx_devlist, devlist) {
		if (dev)
			ops->fini(dev);
	}

	mutex_lock(&cx231xx_extension_devlist_lock);
	cx231xx_info("Cx231xx: Removed (%s) extension\n", ops->name);
	list_del(&ops->next);
	mutex_unlock(&cx231xx_extension_devlist_lock);
	mutex_unlock(&cx231xx_devlist_mutex);
}
EXPORT_SYMBOL(cx231xx_unregister_extension);


void cx231xx_init_extension(struct cx231xx *dev)
{
	struct cx231xx_ops *ops = NULL;

	mutex_lock(&cx231xx_extension_devlist_lock);
	if (!list_empty(&cx231xx_extension_devlist)) {
		list_for_each_entry(ops, &cx231xx_extension_devlist, next) {
			if (ops->init)
				ops->init(dev);
		}
	}
	mutex_unlock(&cx231xx_extension_devlist_lock);
}

void cx231xx_close_extension(struct cx231xx *dev)
{
	struct cx231xx_ops *ops = NULL;

	mutex_lock(&cx231xx_extension_devlist_lock);
	if (!list_empty(&cx231xx_extension_devlist)) {
		list_for_each_entry(ops, &cx231xx_extension_devlist, next) {
			if (ops->fini)
				ops->fini(dev);
		}
	}
	mutex_unlock(&cx231xx_extension_devlist_lock);
}

/************************************************************************************
*                              U S B related functions                              *
*************************************************************************************/
int cx231xx_send_usb_command(struct cx231xx_i2c *i2c_bus,
                   struct cx231xx_i2c_xfer_data *req_data)
{
    int status = 0;
    struct cx231xx *dev = i2c_bus->dev;
    VENDOR_REQUEST_IN ven_req;

    u8 saddr_len    = 0;
    u8 _i2c_period  = 0;
    u8 _i2c_nostop  = 0;
    u8 _i2c_reserve = 0;

    /* Get the I2C period, nostop and reserve parameters */
    _i2c_period  = i2c_bus->i2c_period;
    _i2c_nostop  = i2c_bus->i2c_nostop;
    _i2c_reserve = i2c_bus->i2c_reserve;

    saddr_len = req_data->saddr_len;

    /* Set wValue */
    if(saddr_len == 1)                          /* need check saddr_len == 0  */
        ven_req.wValue = req_data->dev_addr<<9|_i2c_period<<4|saddr_len<<2|
                        _i2c_nostop<<1|I2C_SYNC|_i2c_reserve<<6;
    else
        ven_req.wValue = req_data->dev_addr<<9|_i2c_period<<4|saddr_len<<2|
                        _i2c_nostop<<1|I2C_SYNC|_i2c_reserve<<6;

    /* set channel number */
    if(req_data->direction & I2C_M_RD)
        ven_req.bRequest = i2c_bus->nr + 4;   /* channel number, for read,
                                                 spec required channel_num +4 */
    else
        ven_req.bRequest = i2c_bus->nr;       /* channel number,  */

    /* set index value */
    switch(saddr_len){
        case 0:
            ven_req.wIndex = 0;               /* need check */
            break;
        case 1:
            ven_req.wIndex = (req_data->saddr_dat & 0xff);
            break;
        case 2:
            ven_req.wIndex = req_data->saddr_dat;
            break;
    }

    /* set wLength value */
    ven_req.wLength = req_data->buf_size;

    /* set bData value */
    ven_req.bData = 0;

    /* set the direction */
    if(req_data->direction){
        ven_req.direction = USB_DIR_IN;
        memset(req_data->p_buffer, 0x00, ven_req.wLength);
    }
    else
        ven_req.direction = USB_DIR_OUT;

    /* set the buffer for read / write */
    ven_req.pBuff = req_data->p_buffer;



    /* call common vendor command request */
    status = cx231xx_send_vendor_cmd(dev, &ven_req);
    if (status < 0) {
        cx231xx_info("UsbInterface::sendCommand, output buffer failed with status -%d\n", status);
    }

    return status;
}

EXPORT_SYMBOL_GPL(cx231xx_send_usb_command);
/*
 * cx231xx_read_ctrl_reg()
 * reads data from the usb device specifying bRequest and wValue
 */
int cx231xx_read_ctrl_reg(struct cx231xx *dev, u8 req, u16 reg,
			    char *buf, int len)
{
     u8 val = 0;
	int ret;
	int pipe = usb_rcvctrlpipe(dev->udev, 0);

	if (dev->state & DEV_DISCONNECTED)
		return -ENODEV;

	if (len > URB_MAX_CTRL_SIZE)
		return -EINVAL;

    switch(len)
    {
        case 1:
            val = ENABLE_ONE_BYTE;
            break;
        case 2:
            val = ENABLE_TWE_BYTE;
            break;
        case 3:
            val = ENABLE_THREE_BYTE;
            break;
        case 4:
            val = ENABLE_FOUR_BYTE;
            break;
        default:
            val = 0xFF; /* invalid option */
    }

    if(val == 0xFF)
        return -EINVAL;

	if (reg_debug) {
		cx231xx_isocdbg("(pipe 0x%08x): "
			"IN:  %02x %02x %02x %02x %02x %02x %02x %02x ",
			pipe,
			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			req, 0, val,
			reg & 0xff, reg >> 8,
			len & 0xff, len >> 8);
	}

	/* mutex_lock(&dev->ctrl_urb_lock);  */
	ret = usb_control_msg(dev->udev, pipe, req,
			      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      val, reg, dev->urb_buf, len, HZ);
	if (ret < 0) {
		cx231xx_isocdbg(" failed!\n");
		/* mutex_unlock(&dev->ctrl_urb_lock); */
		return ret;
	}

	if (len)
		memcpy(buf, dev->urb_buf, len);

	/* mutex_unlock(&dev->ctrl_urb_lock); */

	if (reg_debug) {
		int byte;

		cx231xx_isocdbg("<<<");
		for (byte = 0; byte < len; byte++)
			cx231xx_isocdbg(" %02x", (unsigned char)buf[byte]);
		cx231xx_isocdbg("\n");
	}

	return ret;
}


int cx231xx_send_vendor_cmd(struct cx231xx *dev, VENDOR_REQUEST_IN *ven_req)
{
    int ret;
	int pipe = 0;

	if (dev->state & DEV_DISCONNECTED)
		return -ENODEV;

	if ((ven_req->wLength > URB_MAX_CTRL_SIZE))
		return -EINVAL;

    if(ven_req->direction)
        pipe = usb_rcvctrlpipe(dev->udev, 0);
    else
        pipe = usb_sndctrlpipe(dev->udev, 0);


	if (reg_debug) {
		int byte;

		cx231xx_isocdbg("(pipe 0x%08x): "
			"OUT: %02x %02x %02x %04x %04x %04x >>>",
			pipe,
			ven_req->direction | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			ven_req->bRequest, 0, ven_req->wValue,
			ven_req->wIndex,
			ven_req->wLength);

		for (byte = 0; byte < ven_req->wLength; byte++)
			cx231xx_isocdbg(" %02x", (unsigned char)ven_req->pBuff[byte]);
		cx231xx_isocdbg("\n");
	}

	/* mutex_lock(&dev->ctrl_urb_lock); */
	ret = usb_control_msg(dev->udev, pipe, ven_req->bRequest,
			      ven_req->direction | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      ven_req->wValue, ven_req->wIndex, ven_req->pBuff, ven_req->wLength, HZ);
	/* mutex_unlock(&dev->ctrl_urb_lock); */

	return ret;
}

/*
 * cx231xx_write_ctrl_reg()
 * sends data to the usb device, specifying bRequest
 */
int cx231xx_write_ctrl_reg(struct cx231xx *dev, u8 req, u16 reg, char *buf,
				 int len)
{
    u8 val = 0;
	int ret;
	int pipe = usb_sndctrlpipe(dev->udev, 0);

	if (dev->state & DEV_DISCONNECTED)
		return -ENODEV;

	if ((len < 1) || (len > URB_MAX_CTRL_SIZE))
		return -EINVAL;

    switch(len)
    {
        case 1:
            val = ENABLE_ONE_BYTE;
            break;
        case 2:
            val = ENABLE_TWE_BYTE;
            break;
        case 3:
            val = ENABLE_THREE_BYTE;
            break;
        case 4:
            val = ENABLE_FOUR_BYTE;
            break;
        default:
            val = 0xFF; /* invalid option */
    }

    if(val == 0xFF)
        return -EINVAL;

	if (reg_debug) {
		int byte;

		cx231xx_isocdbg("(pipe 0x%08x): "
			"OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>>",
			pipe,
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			req, 0, val,
			reg & 0xff, reg >> 8,
			len & 0xff, len >> 8);

		for (byte = 0; byte < len; byte++)
			cx231xx_isocdbg(" %02x", (unsigned char)buf[byte]);
		cx231xx_isocdbg("\n");
	}

	/* mutex_lock(&dev->ctrl_urb_lock); */
	memcpy(dev->urb_buf, buf, len);
	ret = usb_control_msg(dev->udev, pipe, req,
			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      val, reg, dev->urb_buf, len, HZ);
	/* mutex_unlock(&dev->ctrl_urb_lock); */

	return ret;
}


/************************************************************************************
*                         USB Alternate Setting functions                           *
*************************************************************************************/

int cx231xx_set_video_alternate(struct cx231xx *dev)
{
	int errCode, prev_alt = dev->video_mode.alt;
	unsigned int min_pkt_size = dev->width * 2 + 4;
    u32 usb_interface_index = 0;

	/* When image size is bigger than a certain value,
	   the frame size should be increased, otherwise, only
	   green screen will be received.
	 */
	if (dev->width * 2 * dev->height > 720 * 240 * 2)
		min_pkt_size *= 2;

    if(dev->width > 360) {
        /* resolutions: 720,704,640 */
        dev->video_mode.alt = 3;
    } else if(dev->width > 180) {
        /* resolutions: 360,352,320,240 */
        dev->video_mode.alt = 2;
    } else if(dev->width > 0) {
        /* resolutions: 180,176,160,128,88 */
        dev->video_mode.alt = 1;
    } else {
        /* Change to alt0 BULK to release USB bandwidth */
        dev->video_mode.alt = 0;
    }

    /* Get the correct video interface Index */
    usb_interface_index = dev->current_pcb_config.hs_config_info[0].interface_info.video_index+1;

	if (dev->video_mode.alt != prev_alt) {
		cx231xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
				min_pkt_size, dev->video_mode.alt);
		dev->video_mode.max_pkt_size = dev->video_mode.alt_max_pkt_size[dev->video_mode.alt];
		cx231xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n",
			       dev->video_mode.alt, dev->video_mode.max_pkt_size);
        cx231xx_info(" setting alternate %d with wMaxPacketSize=%u , Interface = %d\n",
			       dev->video_mode.alt, dev->video_mode.max_pkt_size, usb_interface_index);
		errCode = usb_set_interface(dev->udev, usb_interface_index, dev->video_mode.alt);
		if (errCode < 0) {
			cx231xx_errdev("cannot change alternate number to %d (error=%i)\n",
					dev->video_mode.alt, errCode);
			return errCode;
		}
	}
	return 0;
}

int cx231xx_set_alt_setting(struct cx231xx *dev, u8 index, u8 alt)
{
    int status = 0;
    u32 usb_interface_index = 0;
    u32 max_pkt_size = 0;

    switch(index) {
        case INDEX_TS1:
            usb_interface_index = dev->current_pcb_config.hs_config_info[0].interface_info.ts1_index+1;
            dev->video_mode.alt = alt;
            if(dev->ts1_mode.alt_max_pkt_size != NULL)
                max_pkt_size = dev->ts1_mode.max_pkt_size = dev->ts1_mode.alt_max_pkt_size[dev->ts1_mode.alt];
            break;
        case INDEX_TS2:
            usb_interface_index = dev->current_pcb_config.hs_config_info[0].interface_info.ts2_index+1;
            break;
        case INDEX_AUDIO:
            usb_interface_index = dev->current_pcb_config.hs_config_info[0].interface_info.audio_index+1;
            dev->adev.alt = alt;
            if( dev->adev.alt_max_pkt_size != NULL)
                max_pkt_size = dev->adev.max_pkt_size = dev->adev.alt_max_pkt_size[dev->adev.alt];
            break;
        case INDEX_VIDEO:
            usb_interface_index = dev->current_pcb_config.hs_config_info[0].interface_info.video_index+1;
            dev->video_mode.alt = alt;
            if(dev->video_mode.alt_max_pkt_size != NULL)
                max_pkt_size = dev->video_mode.max_pkt_size = dev->video_mode.alt_max_pkt_size[dev->video_mode.alt];
            break;
        case INDEX_VANC:
            usb_interface_index = dev->current_pcb_config.hs_config_info[0].interface_info.vanc_index+1;
            dev->vbi_mode.alt = alt;
            if(dev->vbi_mode.alt_max_pkt_size != NULL)
                max_pkt_size = dev->vbi_mode.max_pkt_size = dev->vbi_mode.alt_max_pkt_size[dev->vbi_mode.alt];
            break;
        case INDEX_HANC:
            usb_interface_index = dev->current_pcb_config.hs_config_info[0].interface_info.hanc_index+1;
            dev->sliced_cc_mode.alt = alt;
            if(dev->sliced_cc_mode.alt_max_pkt_size != NULL)
                max_pkt_size = dev->sliced_cc_mode.max_pkt_size = dev->sliced_cc_mode.alt_max_pkt_size[dev->sliced_cc_mode.alt];
            break;
        default:
            break;
    }

    if(alt > 0 && max_pkt_size == 0 ) {
        cx231xx_errdev("cannot change interface %d alternate number to %d : Max. Pkt size is ZERO\n",
					usb_interface_index, alt);
        return -1;
    }

    cx231xx_info(" setting alternate %d with wMaxPacketSize=%u , Interface = %d\n",
			       alt, max_pkt_size, usb_interface_index);

    if(usb_interface_index > 0 ) {
        status = usb_set_interface(dev->udev, usb_interface_index, alt);
		if (status < 0) {
			cx231xx_errdev("cannot change interface %d alternate number to %d (error=%i)\n",
					usb_interface_index, alt, status);
			return status;
		}
    }

    return status;
}
EXPORT_SYMBOL_GPL(cx231xx_set_alt_setting);

int cx231xx_gpio_set(struct cx231xx *dev, struct cx231xx_reg_seq *gpio)
{
	int rc = 0;

	if (!gpio)
		return rc;

	/* Send GPIO reset sequences specified at board entry */
	while (gpio->sleep >= 0) {
        rc = cx231xx_set_gpio_value(dev, gpio->bit,
						   gpio->val);
			if (rc < 0)
				return rc;

		if (gpio->sleep > 0)
			msleep(gpio->sleep);

		gpio++;
	}
	return rc;
}

int cx231xx_set_mode(struct cx231xx *dev, enum cx231xx_mode set_mode)
{
	if (dev->mode == set_mode)
		return 0;

	if (set_mode == CX231XX_SUSPEND) {
        /* Set the chip in power saving mode */
		dev->mode = set_mode;
	}

	/* Resource is locked */
	if (dev->mode != CX231XX_SUSPEND)
		return -EINVAL;

	dev->mode = set_mode;

    if (dev->mode == CX231XX_DIGITAL_MODE) {
        /* Set Digital power mode */
    } else {
        /* Set Analog Power mode*/
    }
    return 0;
}
EXPORT_SYMBOL_GPL(cx231xx_set_mode);

/************************************************************************************
*                               URB Streaming functions                             *
*************************************************************************************/

/*
 * IRQ callback, called by URB callback
 */
static void cx231xx_irq_callback(struct urb *urb)
{
	struct cx231xx_dmaqueue  *dma_q = urb->context;
    struct cx231xx_video_mode *vmode = container_of(dma_q, struct cx231xx_video_mode, vidq);
    struct cx231xx *dev = container_of(vmode, struct cx231xx, video_mode);
	int rc, i;


    switch (urb->status) {
	    case 0:             /* success */
	    case -ETIMEDOUT:    /* NAK */
		    break;
	    case -ECONNRESET:   /* kill */
	    case -ENOENT:
	    case -ESHUTDOWN:
		    return;
	    default:            /* error */
		    cx231xx_isocdbg("urb completition error %d.\n", urb->status);
		    break;
	}

	/* Copy data from URB */
	spin_lock(&dev->video_mode.slock);
	rc = dev->video_mode.isoc_ctl.isoc_copy(dev, urb);
	spin_unlock(&dev->video_mode.slock);

	/* Reset urb buffers */
	for (i = 0; i < urb->number_of_packets; i++) {
		urb->iso_frame_desc[i].status = 0;
		urb->iso_frame_desc[i].actual_length = 0;
	}
	urb->status = 0;

	urb->status = usb_submit_urb(urb, GFP_ATOMIC);
	if (urb->status) {
		cx231xx_isocdbg("urb resubmit failed (error=%i)\n",
			       urb->status);
	}
}

/*
 * Stop and Deallocate URBs
 */
void cx231xx_uninit_isoc(struct cx231xx *dev)
{
	struct urb *urb;
	int i;

	cx231xx_isocdbg("cx231xx: called cx231xx_uninit_isoc\n");

	dev->video_mode.isoc_ctl.nfields = -1;
	for (i = 0; i < dev->video_mode.isoc_ctl.num_bufs; i++) {
		urb = dev->video_mode.isoc_ctl.urb[i];
		if (urb) {
            if (!irqs_disabled())
			    usb_kill_urb(urb);
            else
			    usb_unlink_urb(urb);

			if (dev->video_mode.isoc_ctl.transfer_buffer[i]) {
				usb_buffer_free(dev->udev,
					urb->transfer_buffer_length,
					dev->video_mode.isoc_ctl.transfer_buffer[i],
					urb->transfer_dma);
			}
			usb_free_urb(urb);
			dev->video_mode.isoc_ctl.urb[i] = NULL;
		}
		dev->video_mode.isoc_ctl.transfer_buffer[i] = NULL;
	}

	kfree(dev->video_mode.isoc_ctl.urb);
	kfree(dev->video_mode.isoc_ctl.transfer_buffer);

	dev->video_mode.isoc_ctl.urb = NULL;
	dev->video_mode.isoc_ctl.transfer_buffer = NULL;
	dev->video_mode.isoc_ctl.num_bufs = 0;

	cx231xx_capture_start(dev, 0, Raw_Video);
}
EXPORT_SYMBOL_GPL(cx231xx_uninit_isoc);

/*
 * Allocate URBs and start IRQ
 */
int cx231xx_init_isoc(struct cx231xx *dev, int max_packets,
		     int num_bufs, int max_pkt_size,
		     int (*isoc_copy) (struct cx231xx *dev, struct urb *urb))
{
	struct cx231xx_dmaqueue *dma_q = &dev->video_mode.vidq;
	int i;
	int sb_size, pipe;
	struct urb *urb;
	int j, k;
	int rc;

	cx231xx_isocdbg("cx231xx: called cx231xx_prepare_isoc\n");

    dev->video_input = dev->video_input > 2?2:dev->video_input;

    cx231xx_info("Setting Video mux to %d\n",dev->video_input);
    video_mux(dev, dev->video_input);


	/* De-allocates all pending stuff */
	cx231xx_uninit_isoc(dev);

	dev->video_mode.isoc_ctl.isoc_copy = isoc_copy;
	dev->video_mode.isoc_ctl.num_bufs = num_bufs;
    dma_q->pos = 0;
    dma_q->is_partial_line = 0;
    dma_q->last_sav = 0;
    dma_q->current_field = -1;
    dma_q->field1_done = 0;
    dma_q->lines_per_field = dev->height/2;
    dma_q->bytes_left_in_line = dev->width << 1;
    dma_q->lines_completed = 0;
    for(i = 0; i < 8 ; i++)
        dma_q->partial_buf[i] = 0;

	dev->video_mode.isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs,  GFP_KERNEL);
	if (!dev->video_mode.isoc_ctl.urb) {
		cx231xx_errdev("cannot alloc memory for usb buffers\n");
		return -ENOMEM;
	}

	dev->video_mode.isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
					      GFP_KERNEL);
	if (!dev->video_mode.isoc_ctl.transfer_buffer) {
		cx231xx_errdev("cannot allocate memory for usbtransfer\n");
		kfree(dev->video_mode.isoc_ctl.urb);
		return -ENOMEM;
	}

	dev->video_mode.isoc_ctl.max_pkt_size = max_pkt_size;
	dev->video_mode.isoc_ctl.buf = NULL;

	sb_size = max_packets * dev->video_mode.isoc_ctl.max_pkt_size;

	/* allocate urbs and transfer buffers */
	for (i = 0; i < dev->video_mode.isoc_ctl.num_bufs; i++) {
		urb = usb_alloc_urb(max_packets, GFP_KERNEL);
		if (!urb) {
			cx231xx_err("cannot alloc isoc_ctl.urb %i\n", i);
			cx231xx_uninit_isoc(dev);
			return -ENOMEM;
		}
		dev->video_mode.isoc_ctl.urb[i] = urb;

		dev->video_mode.isoc_ctl.transfer_buffer[i] = usb_buffer_alloc(dev->udev,
			sb_size, GFP_KERNEL, &urb->transfer_dma);
		if (!dev->video_mode.isoc_ctl.transfer_buffer[i]) {
			cx231xx_err("unable to allocate %i bytes for transfer"
					" buffer %i%s\n",
					sb_size, i,
					in_interrupt()?" while in int":"");
			cx231xx_uninit_isoc(dev);
			return -ENOMEM;
		}
		memset(dev->video_mode.isoc_ctl.transfer_buffer[i], 0, sb_size);

		pipe = usb_rcvisocpipe(dev->udev, dev->video_mode.end_point_addr);

		usb_fill_int_urb(urb, dev->udev, pipe,
				 dev->video_mode.isoc_ctl.transfer_buffer[i], sb_size,
				 cx231xx_irq_callback, dma_q, 1);

		urb->number_of_packets = max_packets;
		urb->transfer_flags = URB_ISO_ASAP;

		k = 0;
		for (j = 0; j < max_packets; j++) {
			urb->iso_frame_desc[j].offset = k;
			urb->iso_frame_desc[j].length =
						dev->video_mode.isoc_ctl.max_pkt_size;
			k += dev->video_mode.isoc_ctl.max_pkt_size;
		}
	}

	init_waitqueue_head(&dma_q->wq);


	/* submit urbs and enables IRQ */
	for (i = 0; i < dev->video_mode.isoc_ctl.num_bufs; i++) {
		rc = usb_submit_urb(dev->video_mode.isoc_ctl.urb[i], GFP_ATOMIC);
		if (rc) {
			cx231xx_err("submit of urb %i failed (error=%i)\n", i,
				   rc);
			cx231xx_uninit_isoc(dev);
			return rc;
		}
	}

    cx231xx_capture_start(dev, 1, Raw_Video);

	return 0;
}
EXPORT_SYMBOL_GPL(cx231xx_init_isoc);

/************************************************************************************
*                          Device Init/UnInit functions                             *
*************************************************************************************/
int cx231xx_dev_init(struct cx231xx *dev)
{
    int errCode = 0;

    /* Initialize I2C bus */

	/* External Master 1 Bus */
	dev->i2c_bus[0].nr = 0;
	dev->i2c_bus[0].dev = dev;
	dev->i2c_bus[0].i2c_period = I2C_SPEED_1M;  /* 1MHz */
    dev->i2c_bus[0].i2c_nostop = 0;
    dev->i2c_bus[0].i2c_reserve = 0;

	/* External Master 2 Bus */
	dev->i2c_bus[1].nr = 1;
	dev->i2c_bus[1].dev = dev;
	dev->i2c_bus[1].i2c_period =  I2C_SPEED_1M;  /* 1MHz */
    dev->i2c_bus[1].i2c_nostop = 0;
    dev->i2c_bus[1].i2c_reserve = 0;

	/* Internal Master 3 Bus */
	dev->i2c_bus[2].nr = 2;
	dev->i2c_bus[2].dev = dev;
	dev->i2c_bus[2].i2c_period = I2C_SPEED_400K; /* 400kHz */
    dev->i2c_bus[2].i2c_nostop = 0;
    dev->i2c_bus[2].i2c_reserve = 0;

    /* register I2C buses */
	cx231xx_i2c_register(&dev->i2c_bus[0]);
	cx231xx_i2c_register(&dev->i2c_bus[1]);
	cx231xx_i2c_register(&dev->i2c_bus[2]);

    /* init hardware */
    /* Note : with out calling set power mode function, colibri can not be set up correctly */
    errCode = cx231xx_set_power_mode(dev, POLARIS_AVMODE_ANALOGT_TV);
    if (errCode < 0) {
        cx231xx_errdev("%s: cx231xx_set_power_mode : Failed to set Power - errCode [%d]!\n",
			__func__, errCode);
		return errCode;
	}

    /* initialize Colibri block */
    errCode = cx231xx_colibri_init_super_block(dev, 0x23c);
	if (errCode < 0) {
		cx231xx_errdev("%s: cx231xx_colibri init super block - errCode [%d]!\n",
			__func__, errCode);
		return errCode;
	}
    errCode = cx231xx_colibri_init_channels(dev);
    if (errCode < 0) {
		cx231xx_errdev("%s: cx231xx_colibri init channels - errCode [%d]!\n",
			__func__, errCode);
		return errCode;
	}

    /* Set DIF in By pass mode */
    errCode = cx231xx_dif_set_standard(dev, DIF_USE_BASEBAND);
    if (errCode < 0) {
		cx231xx_errdev("%s: cx231xx_dif set to By pass mode - errCode [%d]!\n",
			__func__, errCode);
		return errCode;
	}

    /* flatiron related functions */
    errCode = cx231xx_flatiron_initialize(dev);
    if (errCode < 0) {
		cx231xx_errdev("%s: cx231xx_flatiron initialize - errCode [%d]!\n",
			__func__, errCode);
		return errCode;
	}

    /* init control pins */
    errCode = cx231xx_init_ctrl_pin_status(dev);
    if (errCode < 0) {
		cx231xx_errdev("%s: cx231xx_init ctrl pins - errCode [%d]!\n",
			__func__, errCode);
		return errCode;
	}

    /* set AGC mode to Analog */
    errCode = cx231xx_set_agc_analog_digital_mux_select(dev, 1);
    if (errCode < 0) {
		cx231xx_errdev("%s: cx231xx_AGC mode to Analog - errCode [%d]!\n",
			__func__, errCode);
		return errCode;
	}

    /* set all alternate settings to zero initially */
    cx231xx_set_alt_setting(dev, INDEX_VIDEO, 0);
    cx231xx_set_alt_setting(dev, INDEX_VANC, 0);
    cx231xx_set_alt_setting(dev, INDEX_HANC, 0);
    if(dev->board.has_dvb)
        cx231xx_set_alt_setting(dev, INDEX_TS1, 0);

    /* set the I2C master port to 3 on channel 1 */
    errCode = cx231xx_enable_i2c_for_tuner(dev, I2C_3);

	return errCode;
}
EXPORT_SYMBOL_GPL(cx231xx_dev_init);

void cx231xx_dev_uninit(struct cx231xx *dev)
{
    /* Un Initialize I2C bus */
	cx231xx_i2c_unregister(&dev->i2c_bus[2]);
	cx231xx_i2c_unregister(&dev->i2c_bus[1]);
	cx231xx_i2c_unregister(&dev->i2c_bus[0]);
}
EXPORT_SYMBOL_GPL(cx231xx_dev_uninit);


/************************************************************************************
*                              G P I O related functions                            *
*************************************************************************************/
int cx231xx_send_gpio_cmd(struct cx231xx *dev, u32 gpio_bit, u8* gpio_val,
                          u8 len, u8 request, u8 direction)
{
    int status = 0;
    VENDOR_REQUEST_IN ven_req;

    /* Set wValue */
    ven_req.wValue = (u16)(gpio_bit>>16 & 0xffff);

    /* set request */
    if(!request){
        if(direction)
            ven_req.bRequest = VRT_GET_GPIO; /* 0x8 gpio */
        else
            ven_req.bRequest = VRT_SET_GPIO; /* 0x9 gpio */
    }
    else {
        if(direction)
            ven_req.bRequest = VRT_GET_GPIE; /* 0xa gpie */
        else
            ven_req.bRequest = VRT_SET_GPIE; /* 0xb gpie */
    }

    /* set index value */
    ven_req.wIndex = (u16)(gpio_bit & 0xffff);

    /* set wLength value */
    ven_req.wLength = len;

    /* set bData value */
    ven_req.bData = 0;

	/* set the buffer for read / write */
    ven_req.pBuff = gpio_val;

    /* set the direction */
    if(direction){
        ven_req.direction = USB_DIR_IN;
        memset(ven_req.pBuff, 0x00, ven_req.wLength);
    }
    else
        ven_req.direction = USB_DIR_OUT;



    /* call common vendor command request */
    status = cx231xx_send_vendor_cmd(dev, &ven_req);
    if (status < 0)
    {
        cx231xx_info("UsbInterface::sendCommand, output buffer failed with status -%d\n", status);
    }

    return status;
}

EXPORT_SYMBOL_GPL(cx231xx_send_gpio_cmd);

/*************************************************************************************
 *               C O N T R O L - Register R E A D / W R I T E functions              *
 *************************************************************************************/
int cx231xx_mode_register(struct cx231xx *dev, u16 address, u32 mode)
{
    u8  value[4] = {0x0, 0x0, 0x0, 0x0};
    u32 tmp =0;
    int status = 0;

    status = cx231xx_read_ctrl_reg(dev,VRT_GET_REGISTER, address,value,4);
    if(status < 0)
        return status;

    tmp = *((u32 *)value);
    tmp |= mode;

    value[0]=(u8) tmp;
    value[1]=(u8)(tmp>>8);
    value[2]=(u8)(tmp>>16);
    value[3]=(u8)(tmp>>24);

    status = cx231xx_write_ctrl_reg(dev,VRT_SET_REGISTER, address,value,4);

    return status;
}

/*************************************************************************************
 *                      I 2 C Internal C O N T R O L   functions                     *
 *************************************************************************************/
int cx231xx_read_i2c_data(struct cx231xx *dev, u8 dev_addr, u16 saddr,
                           u8 saddr_len, u32 *data, u8 data_len)
{
    int status = 0;
    struct cx231xx_i2c_xfer_data req_data;
    u8 value[4] ={0,0,0,0};

    if(saddr_len == 0)
        saddr = 0;
    else if(saddr_len == 0)
        saddr &= 0xff;

    /* prepare xfer_data struct */
    req_data.dev_addr = dev_addr >> 1;
    req_data.direction = I2C_M_RD;
    req_data.saddr_len = saddr_len;
    req_data.saddr_dat = saddr;
    req_data.buf_size = data_len;
    req_data.p_buffer = (u8*)value;

    /* usb send command */
    status = dev->cx231xx_send_usb_command(&dev->i2c_bus[0], &req_data);

    if(status >= 0)
    {
        /* Copy the data read back to main buffer */
        if(data_len == 1)
            *data = value[0];
        else
            *data = value[0] | value[1] << 8 | value[2] << 16 | value[3] << 24;
    }

    return status;
}

int cx231xx_write_i2c_data(struct cx231xx *dev, u8 dev_addr, u16 saddr,
                           u8 saddr_len, u32 data, u8 data_len)
{
    int status = 0;
    u8 value[4] ={0,0,0,0};
    struct cx231xx_i2c_xfer_data req_data;

    value[0]=(u8)data;
    value[1]=(u8)(data>>8);
    value[2]=(u8)(data>>16);
    value[3]=(u8)(data>>24);

    if(saddr_len == 0)
        saddr = 0;
    else if(saddr_len == 0)
        saddr &= 0xff;

    /* prepare xfer_data struct */
    req_data.dev_addr = dev_addr >> 1;
    req_data.direction = 0;
    req_data.saddr_len = saddr_len;
    req_data.saddr_dat = saddr;
    req_data.buf_size = data_len;
    req_data.p_buffer = value;

    /* usb send command */
    status = dev->cx231xx_send_usb_command(&dev->i2c_bus[0], &req_data);

    return status;
}

int cx231xx_reg_mask_write(struct cx231xx *dev, u8 dev_addr, u8 size, u16 register_address,
                           u8 bit_start,u8 bit_end, u32 value)
{
    int status = 0;
    u32 tmp;
    u32 mask = 0;
    int i;

    if (bit_start>(size-1) || bit_end>(size-1)) {
        return -1;
    }

    if (size==8){
        status = cx231xx_read_i2c_data(dev, dev_addr, register_address, 2, &tmp, 1);
    } else {
        status = cx231xx_read_i2c_data(dev, dev_addr, register_address, 2, &tmp, 4);
    }

    if (status < 0) {
        return status;
    }

    mask = 1<<bit_end;
    for (i=bit_end; i>bit_start&&i>0; i--) {
        mask = mask + (1<<(i-1));
    }

    value <<= bit_start;

    if (size==8)
    {
        tmp &=  ~mask;
        tmp |=  value;
        tmp &= 0xff;
        status = cx231xx_write_i2c_data(dev, dev_addr, register_address, 2, tmp, 1);
    }
    else
    {
        tmp &=  ~mask;
        tmp |=  value;
        status = cx231xx_write_i2c_data(dev, dev_addr, register_address, 2, tmp, 4);
    }

    return status;
}



int cx231xx_read_modify_write_i2c_dword(struct cx231xx *dev, u8 dev_addr,
                                       u16 saddr, u32 mask, u32 value)
{
    u32   temp;
    int status = 0;

    status = cx231xx_read_i2c_data(dev, dev_addr, saddr, 2, &temp, 4);

    if(status < 0)
        return status;

    temp &= ~mask;
    temp |= value;

    status = cx231xx_write_i2c_data(dev, dev_addr, saddr, 2, temp, 4);

    return status;
}

u32 cx231xx_set_field(u32 field_mask, u32 data)
{
   u32 temp;

   for (temp = field_mask; (temp & 1) == 0; temp >>= 1) {
      data <<= 1;
   }

   return data;
}