drivers/media/video/gspca/finepix.c - kernel/msm-4.19 - Gitiles

 /*
  * Fujifilm Finepix subdriver
  *
  * Copyright (C) 2008 Frank Zago
  *
  * 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
  * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */

 #define MODULE_NAME "finepix"

 #include "gspca.h"

 MODULE_AUTHOR("Frank Zago <frank@zago.net>");
 MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
 MODULE_LICENSE("GPL");

 /* Default timeout, in ms */
 #define FPIX_TIMEOUT (HZ / 10)

 /* Maximum transfer size to use. The windows driver reads by chunks of
  * 0x2000 bytes, so do the same. Note: reading more seems to work
  * too. */
 #define FPIX_MAX_TRANSFER 0x2000

 /* Structure to hold all of our device specific stuff */
 struct usb_fpix {
 	struct gspca_dev gspca_dev;	/* !! must be the first item */

 	/*
 	 * USB stuff
 	 */
 	struct usb_ctrlrequest ctrlreq;
 	struct urb *control_urb;
 	struct timer_list bulk_timer;

 	enum {
 		FPIX_NOP,	/* inactive, else streaming */
 		FPIX_RESET,	/* must reset */
 		FPIX_REQ_FRAME,	/* requesting a frame */
 		FPIX_READ_FRAME,	/* reading frame */
 	} state;

 	/*
 	 * Driver stuff
 	 */
 	struct delayed_work wqe;
 	struct completion can_close;
 	int streaming;
 };

 /* Delay after which claim the next frame. If the delay is too small,
  * the camera will return old frames. On the 4800Z, 20ms is bad, 25ms
  * will fail every 4 or 5 frames, but 30ms is perfect. */
 #define NEXT_FRAME_DELAY  (((HZ * 30) + 999) / 1000)

 #define dev_new_state(new_state) {				\
 		PDEBUG(D_STREAM, "new state from %d to %d at %s:%d",	\
 			dev->state, new_state, __func__, __LINE__);	\
 		dev->state = new_state;					\
 }

 /* These cameras only support 320x200. */
 static struct v4l2_pix_format fpix_mode[1] = {
 	{ 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
 		.bytesperline = 320,
 		.sizeimage = 320 * 240 * 3 / 8 + 590,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0}
 };

 /* Reads part of a frame */
 static void read_frame_part(struct usb_fpix *dev)
 {
 	int ret;

 	PDEBUG(D_STREAM, "read_frame_part");

 	/* Reads part of a frame */
 	ret = usb_submit_urb(dev->gspca_dev.urb[0], GFP_ATOMIC);
 	if (ret) {
 		dev_new_state(FPIX_RESET);
 		schedule_delayed_work(&dev->wqe, 1);
 		PDEBUG(D_STREAM, "usb_submit_urb failed with %d",
 			ret);
 	} else {
 		/* Sometimes we never get a callback, so use a timer.
 		 * Is this masking a bug somewhere else? */
 		dev->bulk_timer.expires = jiffies + msecs_to_jiffies(150);
 		add_timer(&dev->bulk_timer);
 	}
 }

 /* Callback for URBs. */
 static void urb_callback(struct urb *urb)
 {
 	struct gspca_dev *gspca_dev = urb->context;
 	struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;

 	PDEBUG(D_PACK,
 		"enter urb_callback - status=%d, length=%d",
 		urb->status, urb->actual_length);

 	if (dev->state == FPIX_READ_FRAME)
 		del_timer(&dev->bulk_timer);

 	if (urb->status != 0) {
 		/* We kill a stuck urb every 50 frames on average, so don't
 		 * display a log message for that. */
 		if (urb->status != -ECONNRESET)
 			PDEBUG(D_STREAM, "bad URB status %d", urb->status);
 		dev_new_state(FPIX_RESET);
 		schedule_delayed_work(&dev->wqe, 1);
 	}

 	switch (dev->state) {
 	case FPIX_REQ_FRAME:
 		dev_new_state(FPIX_READ_FRAME);
 		read_frame_part(dev);
 		break;

 	case FPIX_READ_FRAME: {
 		unsigned char *data = urb->transfer_buffer;
 		struct gspca_frame *frame;

 		frame = gspca_get_i_frame(&dev->gspca_dev);
 		if (frame == NULL)
 			gspca_dev->last_packet_type = DISCARD_PACKET;
 		if (urb->actual_length < FPIX_MAX_TRANSFER ||
 			(data[urb->actual_length-2] == 0xff &&
 				data[urb->actual_length-1] == 0xd9)) {

 			/* If the result is less than what was asked
 			 * for, then it's the end of the
 			 * frame. Sometime the jpeg is not complete,
 			 * but there's nothing we can do. We also end
 			 * here if the the jpeg ends right at the end
 			 * of the frame. */
 			if (frame)
 				gspca_frame_add(gspca_dev, LAST_PACKET,
 						frame,
 						data, urb->actual_length);
 			dev_new_state(FPIX_REQ_FRAME);
 			schedule_delayed_work(&dev->wqe, NEXT_FRAME_DELAY);
 		} else {

 			/* got a partial image */
 			if (frame)
 				gspca_frame_add(gspca_dev,
 						gspca_dev->last_packet_type
 								== LAST_PACKET
 						? FIRST_PACKET : INTER_PACKET,
 						frame,
 					data, urb->actual_length);
 			read_frame_part(dev);
 		}
 		break;
 	    }

 	case FPIX_NOP:
 	case FPIX_RESET:
 		PDEBUG(D_STREAM, "invalid state %d", dev->state);
 		break;
 	}
 }

 /* Request a new frame */
 static void request_frame(struct usb_fpix *dev)
 {
 	int ret;
 	struct gspca_dev *gspca_dev = &dev->gspca_dev;

 	/* Setup command packet */
 	memset(gspca_dev->usb_buf, 0, 12);
 	gspca_dev->usb_buf[0] = 0xd3;
 	gspca_dev->usb_buf[7] = 0x01;

 	/* Request a frame */
 	dev->ctrlreq.bRequestType =
 		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
 	dev->ctrlreq.bRequest = USB_REQ_GET_STATUS;
 	dev->ctrlreq.wValue = 0;
 	dev->ctrlreq.wIndex = 0;
 	dev->ctrlreq.wLength = cpu_to_le16(12);

 	usb_fill_control_urb(dev->control_urb,
 			     gspca_dev->dev,
 			     usb_sndctrlpipe(gspca_dev->dev, 0),
 			     (unsigned char *) &dev->ctrlreq,
 			     gspca_dev->usb_buf,
 			     12, urb_callback, gspca_dev);

 	ret = usb_submit_urb(dev->control_urb, GFP_ATOMIC);
 	if (ret) {
 		dev_new_state(FPIX_RESET);
 		schedule_delayed_work(&dev->wqe, 1);
 		PDEBUG(D_STREAM, "usb_submit_urb failed with %d", ret);
 	}
 }

 /*--------------------------------------------------------------------------*/

 /* State machine. */
 static void fpix_sm(struct work_struct *work)
 {
 	struct usb_fpix *dev = container_of(work, struct usb_fpix, wqe.work);

 	PDEBUG(D_STREAM, "fpix_sm state %d", dev->state);

 	/* verify that the device wasn't unplugged */
 	if (!dev->gspca_dev.present) {
 		PDEBUG(D_STREAM, "device is gone");
 		dev_new_state(FPIX_NOP);
 		complete(&dev->can_close);
 		return;
 	}

 	if (!dev->streaming) {
 		PDEBUG(D_STREAM, "stopping state machine");
 		dev_new_state(FPIX_NOP);
 		complete(&dev->can_close);
 		return;
 	}

 	switch (dev->state) {
 	case FPIX_RESET:
 		dev_new_state(FPIX_REQ_FRAME);
 		schedule_delayed_work(&dev->wqe, HZ / 10);
 		break;

 	case FPIX_REQ_FRAME:
 		/* get an image */
 		request_frame(dev);
 		break;

 	case FPIX_NOP:
 	case FPIX_READ_FRAME:
 		PDEBUG(D_STREAM, "invalid state %d", dev->state);
 		break;
 	}
 }

 /* this function is called at probe time */
 static int sd_config(struct gspca_dev *gspca_dev,
 		const struct usb_device_id *id)
 {
 	struct cam *cam = &gspca_dev->cam;

 	cam->cam_mode = fpix_mode;
 	cam->nmodes = 1;
 	cam->epaddr = 0x01;	/* todo: correct for all cams? */
 	cam->bulk_size = FPIX_MAX_TRANSFER;

 /*	gspca_dev->nbalt = 1;	 * use bulk transfer */
 	return 0;
 }

 /* Stop streaming and free the ressources allocated by sd_start. */
 static void sd_stopN(struct gspca_dev *gspca_dev)
 {
 	struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;

 	dev->streaming = 0;

 	/* Stop the state machine */
 	if (dev->state != FPIX_NOP)
 		wait_for_completion(&dev->can_close);
 }

 /* called on streamoff with alt 0 and disconnect */
 static void sd_stop0(struct gspca_dev *gspca_dev)
 {
 	struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;

 	usb_free_urb(dev->control_urb);
 	dev->control_urb = NULL;
 }

 /* Kill an URB that hasn't completed. */
 static void timeout_kill(unsigned long data)
 {
 	struct urb *urb = (struct urb *) data;

 	usb_unlink_urb(urb);
 }

 /* this function is called at probe and resume time */
 static int sd_init(struct gspca_dev *gspca_dev)
 {
 	struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;

 	INIT_DELAYED_WORK(&dev->wqe, fpix_sm);

 	init_timer(&dev->bulk_timer);
 	dev->bulk_timer.function = timeout_kill;

 	return 0;
 }

 static int sd_start(struct gspca_dev *gspca_dev)
 {
 	struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 	int ret;
 	int size_ret;

 	/* Reset bulk in endpoint */
 	usb_clear_halt(gspca_dev->dev, gspca_dev->cam.epaddr);

 	/* Init the device */
 	memset(gspca_dev->usb_buf, 0, 12);
 	gspca_dev->usb_buf[0] = 0xc6;
 	gspca_dev->usb_buf[8] = 0x20;

 	ret = usb_control_msg(gspca_dev->dev,
 			usb_sndctrlpipe(gspca_dev->dev, 0),
 			USB_REQ_GET_STATUS,
 			USB_DIR_OUT | USB_TYPE_CLASS |
 			USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
 			12, FPIX_TIMEOUT);

 	if (ret != 12) {
 		PDEBUG(D_STREAM, "usb_control_msg failed (%d)", ret);
 		ret = -EIO;
 		goto error;
 	}

 	/* Read the result of the command. Ignore the result, for it
 	 * varies with the device. */
 	ret = usb_bulk_msg(gspca_dev->dev,
 			usb_rcvbulkpipe(gspca_dev->dev,
 					gspca_dev->cam.epaddr),
 			gspca_dev->usb_buf, FPIX_MAX_TRANSFER, &size_ret,
 			FPIX_TIMEOUT);
 	if (ret != 0) {
 		PDEBUG(D_STREAM, "usb_bulk_msg failed (%d)", ret);
 		ret = -EIO;
 		goto error;
 	}

 	/* Request a frame, but don't read it */
 	memset(gspca_dev->usb_buf, 0, 12);
 	gspca_dev->usb_buf[0] = 0xd3;
 	gspca_dev->usb_buf[7] = 0x01;

 	ret = usb_control_msg(gspca_dev->dev,
 			usb_sndctrlpipe(gspca_dev->dev, 0),
 			USB_REQ_GET_STATUS,
 			USB_DIR_OUT | USB_TYPE_CLASS |
 			USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
 			12, FPIX_TIMEOUT);
 	if (ret != 12) {
 		PDEBUG(D_STREAM, "usb_control_msg failed (%d)", ret);
 		ret = -EIO;
 		goto error;
 	}

 	/* Again, reset bulk in endpoint */
 	usb_clear_halt(gspca_dev->dev, gspca_dev->cam.epaddr);

 	/* Allocate a control URB */
 	dev->control_urb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!dev->control_urb) {
 		PDEBUG(D_STREAM, "No free urbs available");
 		ret = -EIO;
 		goto error;
 	}

 	/* Various initializations. */
 	init_completion(&dev->can_close);
 	dev->bulk_timer.data = (unsigned long)dev->gspca_dev.urb[0];
 	dev->gspca_dev.urb[0]->complete = urb_callback;
 	dev->streaming = 1;

 	/* Schedule a frame request. */
 	dev_new_state(FPIX_REQ_FRAME);
 	schedule_delayed_work(&dev->wqe, 1);

 	return 0;

 error:
 	/* Free the ressources */
 	sd_stopN(gspca_dev);
 	sd_stop0(gspca_dev);
 	return ret;
 }

 /* Table of supported USB devices */
 static const __devinitdata struct usb_device_id device_table[] = {
 	{USB_DEVICE(0x04cb, 0x0104)},
 	{USB_DEVICE(0x04cb, 0x0109)},
 	{USB_DEVICE(0x04cb, 0x010b)},
 	{USB_DEVICE(0x04cb, 0x010f)},
 	{USB_DEVICE(0x04cb, 0x0111)},
 	{USB_DEVICE(0x04cb, 0x0113)},
 	{USB_DEVICE(0x04cb, 0x0115)},
 	{USB_DEVICE(0x04cb, 0x0117)},
 	{USB_DEVICE(0x04cb, 0x0119)},
 	{USB_DEVICE(0x04cb, 0x011b)},
 	{USB_DEVICE(0x04cb, 0x011d)},
 	{USB_DEVICE(0x04cb, 0x0121)},
 	{USB_DEVICE(0x04cb, 0x0123)},
 	{USB_DEVICE(0x04cb, 0x0125)},
 	{USB_DEVICE(0x04cb, 0x0127)},
 	{USB_DEVICE(0x04cb, 0x0129)},
 	{USB_DEVICE(0x04cb, 0x012b)},
 	{USB_DEVICE(0x04cb, 0x012d)},
 	{USB_DEVICE(0x04cb, 0x012f)},
 	{USB_DEVICE(0x04cb, 0x0131)},
 	{USB_DEVICE(0x04cb, 0x013b)},
 	{USB_DEVICE(0x04cb, 0x013d)},
 	{USB_DEVICE(0x04cb, 0x013f)},
 	{}
 };

 MODULE_DEVICE_TABLE(usb, device_table);

 /* sub-driver description */
 static const struct sd_desc sd_desc = {
 	.name = MODULE_NAME,
 	.config = sd_config,
 	.init = sd_init,
 	.start = sd_start,
 	.stopN = sd_stopN,
 	.stop0 = sd_stop0,
 };

 /* -- device connect -- */
 static int sd_probe(struct usb_interface *intf,
 		const struct usb_device_id *id)
 {
 	return gspca_dev_probe(intf, id,
 			&sd_desc,
 			sizeof(struct usb_fpix),
 			THIS_MODULE);
 }

 static struct usb_driver sd_driver = {
 	.name = MODULE_NAME,
 	.id_table = device_table,
 	.probe = sd_probe,
 	.disconnect = gspca_disconnect,
 #ifdef CONFIG_PM
 	.suspend = gspca_suspend,
 	.resume = gspca_resume,
 #endif
 };

 /* -- module insert / remove -- */
 static int __init sd_mod_init(void)
 {
 	if (usb_register(&sd_driver) < 0)
 		return -1;
 	PDEBUG(D_PROBE, "registered");
 	return 0;
 }
 static void __exit sd_mod_exit(void)
 {
 	usb_deregister(&sd_driver);
 	PDEBUG(D_PROBE, "deregistered");
 }

 module_init(sd_mod_init);
 module_exit(sd_mod_exit);
	/*
	* Fujifilm Finepix subdriver
	*
	* Copyright (C) 2008 Frank Zago
	*
	* 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
	* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#define MODULE_NAME "finepix"

	#include "gspca.h"

	MODULE_AUTHOR("Frank Zago <frank@zago.net>");
	MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
	MODULE_LICENSE("GPL");

	/* Default timeout, in ms */
	#define FPIX_TIMEOUT (HZ / 10)

	/* Maximum transfer size to use. The windows driver reads by chunks of
	* 0x2000 bytes, so do the same. Note: reading more seems to work
	* too. */
	#define FPIX_MAX_TRANSFER 0x2000

	/* Structure to hold all of our device specific stuff */
	struct usb_fpix {
	struct gspca_dev gspca_dev; /* !! must be the first item */

	/*
	* USB stuff
	*/
	struct usb_ctrlrequest ctrlreq;
	struct urb *control_urb;
	struct timer_list bulk_timer;

	enum {
	FPIX_NOP, /* inactive, else streaming */
	FPIX_RESET, /* must reset */
	FPIX_REQ_FRAME, /* requesting a frame */
	FPIX_READ_FRAME, /* reading frame */
	} state;

	/*
	* Driver stuff
	*/
	struct delayed_work wqe;
	struct completion can_close;
	int streaming;
	};

	/* Delay after which claim the next frame. If the delay is too small,
	* the camera will return old frames. On the 4800Z, 20ms is bad, 25ms
	* will fail every 4 or 5 frames, but 30ms is perfect. */
	#define NEXT_FRAME_DELAY (((HZ * 30) + 999) / 1000)

	#define dev_new_state(new_state) { \
	PDEBUG(D_STREAM, "new state from %d to %d at %s:%d", \
	dev->state, new_state, __func__, __LINE__); \
	dev->state = new_state; \
	}

	/* These cameras only support 320x200. */
	static struct v4l2_pix_format fpix_mode[1] = {
	{ 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
	.bytesperline = 320,
	.sizeimage = 320 * 240 * 3 / 8 + 590,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0}
	};

	/* Reads part of a frame */
	static void read_frame_part(struct usb_fpix *dev)
	{
	int ret;

	PDEBUG(D_STREAM, "read_frame_part");

	/* Reads part of a frame */
	ret = usb_submit_urb(dev->gspca_dev.urb[0], GFP_ATOMIC);
	if (ret) {
	dev_new_state(FPIX_RESET);
	schedule_delayed_work(&dev->wqe, 1);
	PDEBUG(D_STREAM, "usb_submit_urb failed with %d",
	ret);
	} else {
	/* Sometimes we never get a callback, so use a timer.
	* Is this masking a bug somewhere else? */
	dev->bulk_timer.expires = jiffies + msecs_to_jiffies(150);
	add_timer(&dev->bulk_timer);
	}
	}

	/* Callback for URBs. */
	static void urb_callback(struct urb *urb)
	{
	struct gspca_dev *gspca_dev = urb->context;
	struct usb_fpix dev = (struct usb_fpix ) gspca_dev;

	PDEBUG(D_PACK,
	"enter urb_callback - status=%d, length=%d",
	urb->status, urb->actual_length);

	if (dev->state == FPIX_READ_FRAME)
	del_timer(&dev->bulk_timer);

	if (urb->status != 0) {
	/* We kill a stuck urb every 50 frames on average, so don't
	* display a log message for that. */
	if (urb->status != -ECONNRESET)
	PDEBUG(D_STREAM, "bad URB status %d", urb->status);
	dev_new_state(FPIX_RESET);
	schedule_delayed_work(&dev->wqe, 1);
	}

	switch (dev->state) {
	case FPIX_REQ_FRAME:
	dev_new_state(FPIX_READ_FRAME);
	read_frame_part(dev);
	break;

	case FPIX_READ_FRAME: {
	unsigned char *data = urb->transfer_buffer;
	struct gspca_frame *frame;

	frame = gspca_get_i_frame(&dev->gspca_dev);
	if (frame == NULL)
	gspca_dev->last_packet_type = DISCARD_PACKET;
	if (urb->actual_length < FPIX_MAX_TRANSFER \|\|
	(data[urb->actual_length-2] == 0xff &&
	data[urb->actual_length-1] == 0xd9)) {

	/* If the result is less than what was asked
	* for, then it's the end of the
	* frame. Sometime the jpeg is not complete,
	* but there's nothing we can do. We also end
	* here if the the jpeg ends right at the end
	* of the frame. */
	if (frame)
	gspca_frame_add(gspca_dev, LAST_PACKET,
	frame,
	data, urb->actual_length);
	dev_new_state(FPIX_REQ_FRAME);
	schedule_delayed_work(&dev->wqe, NEXT_FRAME_DELAY);
	} else {

	/* got a partial image */
	if (frame)
	gspca_frame_add(gspca_dev,
	gspca_dev->last_packet_type
	== LAST_PACKET
	? FIRST_PACKET : INTER_PACKET,
	frame,
	data, urb->actual_length);
	read_frame_part(dev);
	}
	break;
	}

	case FPIX_NOP:
	case FPIX_RESET:
	PDEBUG(D_STREAM, "invalid state %d", dev->state);
	break;
	}
	}

	/* Request a new frame */
	static void request_frame(struct usb_fpix *dev)
	{
	int ret;
	struct gspca_dev *gspca_dev = &dev->gspca_dev;

	/* Setup command packet */
	memset(gspca_dev->usb_buf, 0, 12);
	gspca_dev->usb_buf[0] = 0xd3;
	gspca_dev->usb_buf[7] = 0x01;

	/* Request a frame */
	dev->ctrlreq.bRequestType =
	USB_DIR_OUT \| USB_TYPE_CLASS \| USB_RECIP_INTERFACE;
	dev->ctrlreq.bRequest = USB_REQ_GET_STATUS;
	dev->ctrlreq.wValue = 0;
	dev->ctrlreq.wIndex = 0;
	dev->ctrlreq.wLength = cpu_to_le16(12);

	usb_fill_control_urb(dev->control_urb,
	gspca_dev->dev,
	usb_sndctrlpipe(gspca_dev->dev, 0),
	(unsigned char *) &dev->ctrlreq,
	gspca_dev->usb_buf,
	12, urb_callback, gspca_dev);

	ret = usb_submit_urb(dev->control_urb, GFP_ATOMIC);
	if (ret) {
	dev_new_state(FPIX_RESET);
	schedule_delayed_work(&dev->wqe, 1);
	PDEBUG(D_STREAM, "usb_submit_urb failed with %d", ret);
	}
	}

	/--------------------------------------------------------------------------/

	/* State machine. */
	static void fpix_sm(struct work_struct *work)
	{
	struct usb_fpix *dev = container_of(work, struct usb_fpix, wqe.work);

	PDEBUG(D_STREAM, "fpix_sm state %d", dev->state);

	/* verify that the device wasn't unplugged */
	if (!dev->gspca_dev.present) {
	PDEBUG(D_STREAM, "device is gone");
	dev_new_state(FPIX_NOP);
	complete(&dev->can_close);
	return;
	}

	if (!dev->streaming) {
	PDEBUG(D_STREAM, "stopping state machine");
	dev_new_state(FPIX_NOP);
	complete(&dev->can_close);
	return;
	}

	switch (dev->state) {
	case FPIX_RESET:
	dev_new_state(FPIX_REQ_FRAME);
	schedule_delayed_work(&dev->wqe, HZ / 10);
	break;

	case FPIX_REQ_FRAME:
	/* get an image */
	request_frame(dev);
	break;

	case FPIX_NOP:
	case FPIX_READ_FRAME:
	PDEBUG(D_STREAM, "invalid state %d", dev->state);
	break;
	}
	}

	/* this function is called at probe time */
	static int sd_config(struct gspca_dev *gspca_dev,
	const struct usb_device_id *id)
	{
	struct cam *cam = &gspca_dev->cam;

	cam->cam_mode = fpix_mode;
	cam->nmodes = 1;
	cam->epaddr = 0x01; /* todo: correct for all cams? */
	cam->bulk_size = FPIX_MAX_TRANSFER;

	/* gspca_dev->nbalt = 1; * use bulk transfer */
	return 0;
	}

	/* Stop streaming and free the ressources allocated by sd_start. */
	static void sd_stopN(struct gspca_dev *gspca_dev)
	{
	struct usb_fpix dev = (struct usb_fpix ) gspca_dev;

	dev->streaming = 0;

	/* Stop the state machine */
	if (dev->state != FPIX_NOP)
	wait_for_completion(&dev->can_close);
	}

	/* called on streamoff with alt 0 and disconnect */
	static void sd_stop0(struct gspca_dev *gspca_dev)
	{
	struct usb_fpix dev = (struct usb_fpix ) gspca_dev;

	usb_free_urb(dev->control_urb);
	dev->control_urb = NULL;
	}

	/* Kill an URB that hasn't completed. */
	static void timeout_kill(unsigned long data)
	{
	struct urb urb = (struct urb ) data;

	usb_unlink_urb(urb);
	}

	/* this function is called at probe and resume time */
	static int sd_init(struct gspca_dev *gspca_dev)
	{
	struct usb_fpix dev = (struct usb_fpix ) gspca_dev;

	INIT_DELAYED_WORK(&dev->wqe, fpix_sm);

	init_timer(&dev->bulk_timer);
	dev->bulk_timer.function = timeout_kill;

	return 0;
	}

	static int sd_start(struct gspca_dev *gspca_dev)
	{
	struct usb_fpix dev = (struct usb_fpix ) gspca_dev;
	int ret;
	int size_ret;

	/* Reset bulk in endpoint */
	usb_clear_halt(gspca_dev->dev, gspca_dev->cam.epaddr);

	/* Init the device */
	memset(gspca_dev->usb_buf, 0, 12);
	gspca_dev->usb_buf[0] = 0xc6;
	gspca_dev->usb_buf[8] = 0x20;

	ret = usb_control_msg(gspca_dev->dev,
	usb_sndctrlpipe(gspca_dev->dev, 0),
	USB_REQ_GET_STATUS,
	USB_DIR_OUT \| USB_TYPE_CLASS \|
	USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
	12, FPIX_TIMEOUT);

	if (ret != 12) {
	PDEBUG(D_STREAM, "usb_control_msg failed (%d)", ret);
	ret = -EIO;
	goto error;
	}

	/* Read the result of the command. Ignore the result, for it
	* varies with the device. */
	ret = usb_bulk_msg(gspca_dev->dev,
	usb_rcvbulkpipe(gspca_dev->dev,
	gspca_dev->cam.epaddr),
	gspca_dev->usb_buf, FPIX_MAX_TRANSFER, &size_ret,
	FPIX_TIMEOUT);
	if (ret != 0) {
	PDEBUG(D_STREAM, "usb_bulk_msg failed (%d)", ret);
	ret = -EIO;
	goto error;
	}

	/* Request a frame, but don't read it */
	memset(gspca_dev->usb_buf, 0, 12);
	gspca_dev->usb_buf[0] = 0xd3;
	gspca_dev->usb_buf[7] = 0x01;

	ret = usb_control_msg(gspca_dev->dev,
	usb_sndctrlpipe(gspca_dev->dev, 0),
	USB_REQ_GET_STATUS,
	USB_DIR_OUT \| USB_TYPE_CLASS \|
	USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
	12, FPIX_TIMEOUT);
	if (ret != 12) {
	PDEBUG(D_STREAM, "usb_control_msg failed (%d)", ret);
	ret = -EIO;
	goto error;
	}

	/* Again, reset bulk in endpoint */
	usb_clear_halt(gspca_dev->dev, gspca_dev->cam.epaddr);

	/* Allocate a control URB */
	dev->control_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->control_urb) {
	PDEBUG(D_STREAM, "No free urbs available");
	ret = -EIO;
	goto error;
	}

	/* Various initializations. */
	init_completion(&dev->can_close);
	dev->bulk_timer.data = (unsigned long)dev->gspca_dev.urb[0];
	dev->gspca_dev.urb[0]->complete = urb_callback;
	dev->streaming = 1;

	/* Schedule a frame request. */
	dev_new_state(FPIX_REQ_FRAME);
	schedule_delayed_work(&dev->wqe, 1);

	return 0;

	error:
	/* Free the ressources */
	sd_stopN(gspca_dev);
	sd_stop0(gspca_dev);
	return ret;
	}

	/* Table of supported USB devices */
	static const __devinitdata struct usb_device_id device_table[] = {
	{USB_DEVICE(0x04cb, 0x0104)},
	{USB_DEVICE(0x04cb, 0x0109)},
	{USB_DEVICE(0x04cb, 0x010b)},
	{USB_DEVICE(0x04cb, 0x010f)},
	{USB_DEVICE(0x04cb, 0x0111)},
	{USB_DEVICE(0x04cb, 0x0113)},
	{USB_DEVICE(0x04cb, 0x0115)},
	{USB_DEVICE(0x04cb, 0x0117)},
	{USB_DEVICE(0x04cb, 0x0119)},
	{USB_DEVICE(0x04cb, 0x011b)},
	{USB_DEVICE(0x04cb, 0x011d)},
	{USB_DEVICE(0x04cb, 0x0121)},
	{USB_DEVICE(0x04cb, 0x0123)},
	{USB_DEVICE(0x04cb, 0x0125)},
	{USB_DEVICE(0x04cb, 0x0127)},
	{USB_DEVICE(0x04cb, 0x0129)},
	{USB_DEVICE(0x04cb, 0x012b)},
	{USB_DEVICE(0x04cb, 0x012d)},
	{USB_DEVICE(0x04cb, 0x012f)},
	{USB_DEVICE(0x04cb, 0x0131)},
	{USB_DEVICE(0x04cb, 0x013b)},
	{USB_DEVICE(0x04cb, 0x013d)},
	{USB_DEVICE(0x04cb, 0x013f)},
	{}
	};

	MODULE_DEVICE_TABLE(usb, device_table);

	/* sub-driver description */
	static const struct sd_desc sd_desc = {
	.name = MODULE_NAME,
	.config = sd_config,
	.init = sd_init,
	.start = sd_start,
	.stopN = sd_stopN,
	.stop0 = sd_stop0,
	};

	/* -- device connect -- */
	static int sd_probe(struct usb_interface *intf,
	const struct usb_device_id *id)
	{
	return gspca_dev_probe(intf, id,
	&sd_desc,
	sizeof(struct usb_fpix),
	THIS_MODULE);
	}

	static struct usb_driver sd_driver = {
	.name = MODULE_NAME,
	.id_table = device_table,
	.probe = sd_probe,
	.disconnect = gspca_disconnect,
	#ifdef CONFIG_PM
	.suspend = gspca_suspend,
	.resume = gspca_resume,
	#endif
	};

	/* -- module insert / remove -- */
	static int __init sd_mod_init(void)
	{
	if (usb_register(&sd_driver) < 0)
	return -1;
	PDEBUG(D_PROBE, "registered");
	return 0;
	}
	static void __exit sd_mod_exit(void)
	{
	usb_deregister(&sd_driver);
	PDEBUG(D_PROBE, "deregistered");
	}

	module_init(sd_mod_init);
	module_exit(sd_mod_exit);