drivers/media/usb/gspca/jl2005bcd.c - kernel/msm-4.9 - Gitiles

 /*
  * Jeilin JL2005B/C/D library
  *
  * Copyright (C) 2011 Theodore Kilgore <kilgota@auburn.edu>
  *
  * 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 "jl2005bcd"

 #include <linux/workqueue.h>
 #include <linux/slab.h>
 #include "gspca.h"


 MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
 MODULE_DESCRIPTION("JL2005B/C/D USB Camera Driver");
 MODULE_LICENSE("GPL");

 /* Default timeouts, in ms */
 #define JL2005C_CMD_TIMEOUT 500
 #define JL2005C_DATA_TIMEOUT 1000

 /* Maximum transfer size to use. */
 #define JL2005C_MAX_TRANSFER 0x200
 #define FRAME_HEADER_LEN 16


 /* specific webcam descriptor */
 struct sd {
 	struct gspca_dev gspca_dev;  /* !! must be the first item */
 	unsigned char firmware_id[6];
 	const struct v4l2_pix_format *cap_mode;
 	/* Driver stuff */
 	struct work_struct work_struct;
 	struct workqueue_struct *work_thread;
 	u8 frame_brightness;
 	int block_size;	/* block size of camera */
 	int vga;	/* 1 if vga cam, 0 if cif cam */
 };


 /* Camera has two resolution settings. What they are depends on model. */
 static const struct v4l2_pix_format cif_mode[] = {
 	{176, 144, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
 		.bytesperline = 176,
 		.sizeimage = 176 * 144,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0},
 	{352, 288, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
 		.bytesperline = 352,
 		.sizeimage = 352 * 288,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0},
 };

 static const struct v4l2_pix_format vga_mode[] = {
 	{320, 240, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
 		.bytesperline = 320,
 		.sizeimage = 320 * 240,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0},
 	{640, 480, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
 		.bytesperline = 640,
 		.sizeimage = 640 * 480,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0},
 };

 /*
  * cam uses endpoint 0x03 to send commands, 0x84 for read commands,
  * and 0x82 for bulk data transfer.
  */

 /* All commands are two bytes only */
 static int jl2005c_write2(struct gspca_dev *gspca_dev, unsigned char *command)
 {
 	int retval;

 	memcpy(gspca_dev->usb_buf, command, 2);
 	retval = usb_bulk_msg(gspca_dev->dev,
 			usb_sndbulkpipe(gspca_dev->dev, 3),
 			gspca_dev->usb_buf, 2, NULL, 500);
 	if (retval < 0)
 		pr_err("command write [%02x] error %d\n",
 		       gspca_dev->usb_buf[0], retval);
 	return retval;
 }

 /* Response to a command is one byte in usb_buf[0], only if requested. */
 static int jl2005c_read1(struct gspca_dev *gspca_dev)
 {
 	int retval;

 	retval = usb_bulk_msg(gspca_dev->dev,
 				usb_rcvbulkpipe(gspca_dev->dev, 0x84),
 				gspca_dev->usb_buf, 1, NULL, 500);
 	if (retval < 0)
 		pr_err("read command [0x%02x] error %d\n",
 		       gspca_dev->usb_buf[0], retval);
 	return retval;
 }

 /* Response appears in gspca_dev->usb_buf[0] */
 static int jl2005c_read_reg(struct gspca_dev *gspca_dev, unsigned char reg)
 {
 	int retval;

 	static u8 instruction[2] = {0x95, 0x00};
 	/* put register to read in byte 1 */
 	instruction[1] = reg;
 	/* Send the read request */
 	retval = jl2005c_write2(gspca_dev, instruction);
 	if (retval < 0)
 		return retval;
 	retval = jl2005c_read1(gspca_dev);

 	return retval;
 }

 static int jl2005c_start_new_frame(struct gspca_dev *gspca_dev)
 {
 	int i;
 	int retval;
 	int frame_brightness = 0;

 	static u8 instruction[2] = {0x7f, 0x01};

 	retval = jl2005c_write2(gspca_dev, instruction);
 	if (retval < 0)
 		return retval;

 	i = 0;
 	while (i < 20 && !frame_brightness) {
 		/* If we tried 20 times, give up. */
 		retval = jl2005c_read_reg(gspca_dev, 0x7e);
 		if (retval < 0)
 			return retval;
 		frame_brightness = gspca_dev->usb_buf[0];
 		retval = jl2005c_read_reg(gspca_dev, 0x7d);
 		if (retval < 0)
 			return retval;
 		i++;
 	}
 	PDEBUG(D_FRAM, "frame_brightness is 0x%02x", gspca_dev->usb_buf[0]);
 	return retval;
 }

 static int jl2005c_write_reg(struct gspca_dev *gspca_dev, unsigned char reg,
 						    unsigned char value)
 {
 	int retval;
 	u8 instruction[2];

 	instruction[0] = reg;
 	instruction[1] = value;

 	retval = jl2005c_write2(gspca_dev, instruction);
 	if (retval < 0)
 			return retval;

 	return retval;
 }

 static int jl2005c_get_firmware_id(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *)gspca_dev;
 	int i = 0;
 	int retval = -1;
 	unsigned char regs_to_read[] = {0x57, 0x02, 0x03, 0x5d, 0x5e, 0x5f};

 	PDEBUG(D_PROBE, "Running jl2005c_get_firmware_id");
 	/* Read the first ID byte once for warmup */
 	retval = jl2005c_read_reg(gspca_dev, regs_to_read[0]);
 	PDEBUG(D_PROBE, "response is %02x", gspca_dev->usb_buf[0]);
 	if (retval < 0)
 		return retval;
 	/* Now actually get the ID string */
 	for (i = 0; i < 6; i++) {
 		retval = jl2005c_read_reg(gspca_dev, regs_to_read[i]);
 		if (retval < 0)
 			return retval;
 		sd->firmware_id[i] = gspca_dev->usb_buf[0];
 	}
 	PDEBUG(D_PROBE, "firmware ID is %02x%02x%02x%02x%02x%02x",
 						sd->firmware_id[0],
 						sd->firmware_id[1],
 						sd->firmware_id[2],
 						sd->firmware_id[3],
 						sd->firmware_id[4],
 						sd->firmware_id[5]);
 	return 0;
 }

 static int jl2005c_stream_start_vga_lg
 		    (struct gspca_dev *gspca_dev)
 {
 	int i;
 	int retval = -1;
 	static u8 instruction[][2] = {
 		{0x05, 0x00},
 		{0x7c, 0x00},
 		{0x7d, 0x18},
 		{0x02, 0x00},
 		{0x01, 0x00},
 		{0x04, 0x52},
 	};

 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 		msleep(60);
 		retval = jl2005c_write2(gspca_dev, instruction[i]);
 		if (retval < 0)
 			return retval;
 	}
 	msleep(60);
 	return retval;
 }

 static int jl2005c_stream_start_vga_small(struct gspca_dev *gspca_dev)
 {
 	int i;
 	int retval = -1;
 	static u8 instruction[][2] = {
 		{0x06, 0x00},
 		{0x7c, 0x00},
 		{0x7d, 0x1a},
 		{0x02, 0x00},
 		{0x01, 0x00},
 		{0x04, 0x52},
 	};

 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 		msleep(60);
 		retval = jl2005c_write2(gspca_dev, instruction[i]);
 		if (retval < 0)
 			return retval;
 	}
 	msleep(60);
 	return retval;
 }

 static int jl2005c_stream_start_cif_lg(struct gspca_dev *gspca_dev)
 {
 	int i;
 	int retval = -1;
 	static u8 instruction[][2] = {
 		{0x05, 0x00},
 		{0x7c, 0x00},
 		{0x7d, 0x30},
 		{0x02, 0x00},
 		{0x01, 0x00},
 		{0x04, 0x42},
 	};

 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 		msleep(60);
 		retval = jl2005c_write2(gspca_dev, instruction[i]);
 		if (retval < 0)
 			return retval;
 	}
 	msleep(60);
 	return retval;
 }

 static int jl2005c_stream_start_cif_small(struct gspca_dev *gspca_dev)
 {
 	int i;
 	int retval = -1;
 	static u8 instruction[][2] = {
 		{0x06, 0x00},
 		{0x7c, 0x00},
 		{0x7d, 0x32},
 		{0x02, 0x00},
 		{0x01, 0x00},
 		{0x04, 0x42},
 	};

 	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 		msleep(60);
 		retval = jl2005c_write2(gspca_dev, instruction[i]);
 		if (retval < 0)
 			return retval;
 	}
 	msleep(60);
 	return retval;
 }


 static int jl2005c_stop(struct gspca_dev *gspca_dev)
 {
 	int retval;

 	retval = jl2005c_write_reg(gspca_dev, 0x07, 0x00);
 	return retval;
 }

 /*
  * This function is called as a workqueue function and runs whenever the camera
  * is streaming data. Because it is a workqueue function it is allowed to sleep
  * so we can use synchronous USB calls. To avoid possible collisions with other
  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
  * performing USB operations using it. In practice we don't really need this
  * as the camera doesn't provide any controls.
  */
 static void jl2005c_dostream(struct work_struct *work)
 {
 	struct sd *dev = container_of(work, struct sd, work_struct);
 	struct gspca_dev *gspca_dev = &dev->gspca_dev;
 	int bytes_left = 0; /* bytes remaining in current frame. */
 	int data_len;   /* size to use for the next read. */
 	int header_read = 0;
 	unsigned char header_sig[2] = {0x4a, 0x4c};
 	int act_len;
 	int packet_type;
 	int ret;
 	u8 *buffer;

 	buffer = kmalloc(JL2005C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
 	if (!buffer) {
 		pr_err("Couldn't allocate USB buffer\n");
 		goto quit_stream;
 	}

 	while (gspca_dev->present && gspca_dev->streaming) {
 #ifdef CONFIG_PM
 		if (gspca_dev->frozen)
 			break;
 #endif
 		/* Check if this is a new frame. If so, start the frame first */
 		if (!header_read) {
 			mutex_lock(&gspca_dev->usb_lock);
 			ret = jl2005c_start_new_frame(gspca_dev);
 			mutex_unlock(&gspca_dev->usb_lock);
 			if (ret < 0)
 				goto quit_stream;
 			ret = usb_bulk_msg(gspca_dev->dev,
 				usb_rcvbulkpipe(gspca_dev->dev, 0x82),
 				buffer, JL2005C_MAX_TRANSFER, &act_len,
 				JL2005C_DATA_TIMEOUT);
 			PDEBUG(D_PACK,
 				"Got %d bytes out of %d for header",
 					act_len, JL2005C_MAX_TRANSFER);
 			if (ret < 0 || act_len < JL2005C_MAX_TRANSFER)
 				goto quit_stream;
 			/* Check whether we actually got the first blodk */
 			if (memcmp(header_sig, buffer, 2) != 0) {
 				pr_err("First block is not the first block\n");
 				goto quit_stream;
 			}
 			/* total size to fetch is byte 7, times blocksize
 			 * of which we already got act_len */
 			bytes_left = buffer[0x07] * dev->block_size - act_len;
 			PDEBUG(D_PACK, "bytes_left = 0x%x", bytes_left);
 			/* We keep the header. It has other information, too.*/
 			packet_type = FIRST_PACKET;
 			gspca_frame_add(gspca_dev, packet_type,
 					buffer, act_len);
 			header_read = 1;
 		}
 		while (bytes_left > 0 && gspca_dev->present) {
 			data_len = bytes_left > JL2005C_MAX_TRANSFER ?
 				JL2005C_MAX_TRANSFER : bytes_left;
 			ret = usb_bulk_msg(gspca_dev->dev,
 				usb_rcvbulkpipe(gspca_dev->dev, 0x82),
 				buffer, data_len, &act_len,
 				JL2005C_DATA_TIMEOUT);
 			if (ret < 0 || act_len < data_len)
 				goto quit_stream;
 			PDEBUG(D_PACK,
 				"Got %d bytes out of %d for frame",
 						data_len, bytes_left);
 			bytes_left -= data_len;
 			if (bytes_left == 0) {
 				packet_type = LAST_PACKET;
 				header_read = 0;
 			} else
 				packet_type = INTER_PACKET;
 			gspca_frame_add(gspca_dev, packet_type,
 					buffer, data_len);
 		}
 	}
 quit_stream:
 	if (gspca_dev->present) {
 		mutex_lock(&gspca_dev->usb_lock);
 		jl2005c_stop(gspca_dev);
 		mutex_unlock(&gspca_dev->usb_lock);
 	}
 	kfree(buffer);
 }


 /* 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;
 	struct sd *sd = (struct sd *) gspca_dev;

 	cam = &gspca_dev->cam;
 	/* We don't use the buffer gspca allocates so make it small. */
 	cam->bulk_size = 64;
 	cam->bulk = 1;
 	/* For the rest, the camera needs to be detected */
 	jl2005c_get_firmware_id(gspca_dev);
 	/* Here are some known firmware IDs
 	 * First some JL2005B cameras
 	 * {0x41, 0x07, 0x04, 0x2c, 0xe8, 0xf2}	Sakar KidzCam
 	 * {0x45, 0x02, 0x08, 0xb9, 0x00, 0xd2}	No-name JL2005B
 	 * JL2005C cameras
 	 * {0x01, 0x0c, 0x16, 0x10, 0xf8, 0xc8}	Argus DC-1512
 	 * {0x12, 0x04, 0x03, 0xc0, 0x00, 0xd8}	ICarly
 	 * {0x86, 0x08, 0x05, 0x02, 0x00, 0xd4}	Jazz
 	 *
 	 * Based upon this scanty evidence, we can detect a CIF camera by
 	 * testing byte 0 for 0x4x.
 	 */
 	if ((sd->firmware_id[0] & 0xf0) == 0x40) {
 		cam->cam_mode	= cif_mode;
 		cam->nmodes	= ARRAY_SIZE(cif_mode);
 		sd->block_size	= 0x80;
 	} else {
 		cam->cam_mode	= vga_mode;
 		cam->nmodes	= ARRAY_SIZE(vga_mode);
 		sd->block_size	= 0x200;
 	}

 	INIT_WORK(&sd->work_struct, jl2005c_dostream);

 	return 0;
 }

 /* this function is called at probe and resume time */
 static int sd_init(struct gspca_dev *gspca_dev)
 {
 	return 0;
 }

 static int sd_start(struct gspca_dev *gspca_dev)
 {

 	struct sd *sd = (struct sd *) gspca_dev;
 	sd->cap_mode = gspca_dev->cam.cam_mode;

 	switch (gspca_dev->width) {
 	case 640:
 		PDEBUG(D_STREAM, "Start streaming at vga resolution");
 		jl2005c_stream_start_vga_lg(gspca_dev);
 		break;
 	case 320:
 		PDEBUG(D_STREAM, "Start streaming at qvga resolution");
 		jl2005c_stream_start_vga_small(gspca_dev);
 		break;
 	case 352:
 		PDEBUG(D_STREAM, "Start streaming at cif resolution");
 		jl2005c_stream_start_cif_lg(gspca_dev);
 		break;
 	case 176:
 		PDEBUG(D_STREAM, "Start streaming at qcif resolution");
 		jl2005c_stream_start_cif_small(gspca_dev);
 		break;
 	default:
 		pr_err("Unknown resolution specified\n");
 		return -1;
 	}

 	/* Start the workqueue function to do the streaming */
 	sd->work_thread = create_singlethread_workqueue(MODULE_NAME);
 	queue_work(sd->work_thread, &sd->work_struct);

 	return 0;
 }

 /* called on streamoff with alt==0 and on disconnect */
 /* the usb_lock is held at entry - restore on exit */
 static void sd_stop0(struct gspca_dev *gspca_dev)
 {
 	struct sd *dev = (struct sd *) gspca_dev;

 	/* wait for the work queue to terminate */
 	mutex_unlock(&gspca_dev->usb_lock);
 	/* This waits for sq905c_dostream to finish */
 	destroy_workqueue(dev->work_thread);
 	dev->work_thread = NULL;
 	mutex_lock(&gspca_dev->usb_lock);
 }


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

 /* -- module initialisation -- */
 static const struct usb_device_id device_table[] = {
 	{USB_DEVICE(0x0979, 0x0227)},
 	{}
 };
 MODULE_DEVICE_TABLE(usb, device_table);

 /* -- 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 sd),
 				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,
 	.reset_resume = gspca_resume,
 #endif
 };

 /* -- module insert / remove -- */
 static int __init sd_mod_init(void)
 {
 	int ret;

 	ret = usb_register(&sd_driver);
 	if (ret < 0)
 		return ret;
 	return 0;
 }
 static void __exit sd_mod_exit(void)
 {
 	usb_deregister(&sd_driver);
 }

 module_init(sd_mod_init);
 module_exit(sd_mod_exit);
	/*
	* Jeilin JL2005B/C/D library
	*
	* Copyright (C) 2011 Theodore Kilgore <kilgota@auburn.edu>
	*
	* 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 "jl2005bcd"

	#include <linux/workqueue.h>
	#include <linux/slab.h>
	#include "gspca.h"


	MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
	MODULE_DESCRIPTION("JL2005B/C/D USB Camera Driver");
	MODULE_LICENSE("GPL");

	/* Default timeouts, in ms */
	#define JL2005C_CMD_TIMEOUT 500
	#define JL2005C_DATA_TIMEOUT 1000

	/* Maximum transfer size to use. */
	#define JL2005C_MAX_TRANSFER 0x200
	#define FRAME_HEADER_LEN 16


	/* specific webcam descriptor */
	struct sd {
	struct gspca_dev gspca_dev; /* !! must be the first item */
	unsigned char firmware_id[6];
	const struct v4l2_pix_format *cap_mode;
	/* Driver stuff */
	struct work_struct work_struct;
	struct workqueue_struct *work_thread;
	u8 frame_brightness;
	int block_size; /* block size of camera */
	int vga; /* 1 if vga cam, 0 if cif cam */
	};


	/* Camera has two resolution settings. What they are depends on model. */
	static const struct v4l2_pix_format cif_mode[] = {
	{176, 144, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
	.bytesperline = 176,
	.sizeimage = 176 * 144,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0},
	{352, 288, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
	.bytesperline = 352,
	.sizeimage = 352 * 288,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0},
	};

	static const struct v4l2_pix_format vga_mode[] = {
	{320, 240, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
	.bytesperline = 320,
	.sizeimage = 320 * 240,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0},
	{640, 480, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
	.bytesperline = 640,
	.sizeimage = 640 * 480,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0},
	};

	/*
	* cam uses endpoint 0x03 to send commands, 0x84 for read commands,
	* and 0x82 for bulk data transfer.
	*/

	/* All commands are two bytes only */
	static int jl2005c_write2(struct gspca_dev gspca_dev, unsigned char command)
	{
	int retval;

	memcpy(gspca_dev->usb_buf, command, 2);
	retval = usb_bulk_msg(gspca_dev->dev,
	usb_sndbulkpipe(gspca_dev->dev, 3),
	gspca_dev->usb_buf, 2, NULL, 500);
	if (retval < 0)
	pr_err("command write [%02x] error %d\n",
	gspca_dev->usb_buf[0], retval);
	return retval;
	}

	/* Response to a command is one byte in usb_buf[0], only if requested. */
	static int jl2005c_read1(struct gspca_dev *gspca_dev)
	{
	int retval;

	retval = usb_bulk_msg(gspca_dev->dev,
	usb_rcvbulkpipe(gspca_dev->dev, 0x84),
	gspca_dev->usb_buf, 1, NULL, 500);
	if (retval < 0)
	pr_err("read command [0x%02x] error %d\n",
	gspca_dev->usb_buf[0], retval);
	return retval;
	}

	/* Response appears in gspca_dev->usb_buf[0] */
	static int jl2005c_read_reg(struct gspca_dev *gspca_dev, unsigned char reg)
	{
	int retval;

	static u8 instruction[2] = {0x95, 0x00};
	/* put register to read in byte 1 */
	instruction[1] = reg;
	/* Send the read request */
	retval = jl2005c_write2(gspca_dev, instruction);
	if (retval < 0)
	return retval;
	retval = jl2005c_read1(gspca_dev);

	return retval;
	}

	static int jl2005c_start_new_frame(struct gspca_dev *gspca_dev)
	{
	int i;
	int retval;
	int frame_brightness = 0;

	static u8 instruction[2] = {0x7f, 0x01};

	retval = jl2005c_write2(gspca_dev, instruction);
	if (retval < 0)
	return retval;

	i = 0;
	while (i < 20 && !frame_brightness) {
	/* If we tried 20 times, give up. */
	retval = jl2005c_read_reg(gspca_dev, 0x7e);
	if (retval < 0)
	return retval;
	frame_brightness = gspca_dev->usb_buf[0];
	retval = jl2005c_read_reg(gspca_dev, 0x7d);
	if (retval < 0)
	return retval;
	i++;
	}
	PDEBUG(D_FRAM, "frame_brightness is 0x%02x", gspca_dev->usb_buf[0]);
	return retval;
	}

	static int jl2005c_write_reg(struct gspca_dev *gspca_dev, unsigned char reg,
	unsigned char value)
	{
	int retval;
	u8 instruction[2];

	instruction[0] = reg;
	instruction[1] = value;

	retval = jl2005c_write2(gspca_dev, instruction);
	if (retval < 0)
	return retval;

	return retval;
	}

	static int jl2005c_get_firmware_id(struct gspca_dev *gspca_dev)
	{
	struct sd sd = (struct sd )gspca_dev;
	int i = 0;
	int retval = -1;
	unsigned char regs_to_read[] = {0x57, 0x02, 0x03, 0x5d, 0x5e, 0x5f};

	PDEBUG(D_PROBE, "Running jl2005c_get_firmware_id");
	/* Read the first ID byte once for warmup */
	retval = jl2005c_read_reg(gspca_dev, regs_to_read[0]);
	PDEBUG(D_PROBE, "response is %02x", gspca_dev->usb_buf[0]);
	if (retval < 0)
	return retval;
	/* Now actually get the ID string */
	for (i = 0; i < 6; i++) {
	retval = jl2005c_read_reg(gspca_dev, regs_to_read[i]);
	if (retval < 0)
	return retval;
	sd->firmware_id[i] = gspca_dev->usb_buf[0];
	}
	PDEBUG(D_PROBE, "firmware ID is %02x%02x%02x%02x%02x%02x",
	sd->firmware_id[0],
	sd->firmware_id[1],
	sd->firmware_id[2],
	sd->firmware_id[3],
	sd->firmware_id[4],
	sd->firmware_id[5]);
	return 0;
	}

	static int jl2005c_stream_start_vga_lg
	(struct gspca_dev *gspca_dev)
	{
	int i;
	int retval = -1;
	static u8 instruction[][2] = {
	{0x05, 0x00},
	{0x7c, 0x00},
	{0x7d, 0x18},
	{0x02, 0x00},
	{0x01, 0x00},
	{0x04, 0x52},
	};

	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
	msleep(60);
	retval = jl2005c_write2(gspca_dev, instruction[i]);
	if (retval < 0)
	return retval;
	}
	msleep(60);
	return retval;
	}

	static int jl2005c_stream_start_vga_small(struct gspca_dev *gspca_dev)
	{
	int i;
	int retval = -1;
	static u8 instruction[][2] = {
	{0x06, 0x00},
	{0x7c, 0x00},
	{0x7d, 0x1a},
	{0x02, 0x00},
	{0x01, 0x00},
	{0x04, 0x52},
	};

	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
	msleep(60);
	retval = jl2005c_write2(gspca_dev, instruction[i]);
	if (retval < 0)
	return retval;
	}
	msleep(60);
	return retval;
	}

	static int jl2005c_stream_start_cif_lg(struct gspca_dev *gspca_dev)
	{
	int i;
	int retval = -1;
	static u8 instruction[][2] = {
	{0x05, 0x00},
	{0x7c, 0x00},
	{0x7d, 0x30},
	{0x02, 0x00},
	{0x01, 0x00},
	{0x04, 0x42},
	};

	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
	msleep(60);
	retval = jl2005c_write2(gspca_dev, instruction[i]);
	if (retval < 0)
	return retval;
	}
	msleep(60);
	return retval;
	}

	static int jl2005c_stream_start_cif_small(struct gspca_dev *gspca_dev)
	{
	int i;
	int retval = -1;
	static u8 instruction[][2] = {
	{0x06, 0x00},
	{0x7c, 0x00},
	{0x7d, 0x32},
	{0x02, 0x00},
	{0x01, 0x00},
	{0x04, 0x42},
	};

	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
	msleep(60);
	retval = jl2005c_write2(gspca_dev, instruction[i]);
	if (retval < 0)
	return retval;
	}
	msleep(60);
	return retval;
	}


	static int jl2005c_stop(struct gspca_dev *gspca_dev)
	{
	int retval;

	retval = jl2005c_write_reg(gspca_dev, 0x07, 0x00);
	return retval;
	}

	/*
	* This function is called as a workqueue function and runs whenever the camera
	* is streaming data. Because it is a workqueue function it is allowed to sleep
	* so we can use synchronous USB calls. To avoid possible collisions with other
	* threads attempting to use gspca_dev->usb_buf we take the usb_lock when
	* performing USB operations using it. In practice we don't really need this
	* as the camera doesn't provide any controls.
	*/
	static void jl2005c_dostream(struct work_struct *work)
	{
	struct sd *dev = container_of(work, struct sd, work_struct);
	struct gspca_dev *gspca_dev = &dev->gspca_dev;
	int bytes_left = 0; /* bytes remaining in current frame. */
	int data_len; /* size to use for the next read. */
	int header_read = 0;
	unsigned char header_sig[2] = {0x4a, 0x4c};
	int act_len;
	int packet_type;
	int ret;
	u8 *buffer;

	buffer = kmalloc(JL2005C_MAX_TRANSFER, GFP_KERNEL \| GFP_DMA);
	if (!buffer) {
	pr_err("Couldn't allocate USB buffer\n");
	goto quit_stream;
	}

	while (gspca_dev->present && gspca_dev->streaming) {
	#ifdef CONFIG_PM
	if (gspca_dev->frozen)
	break;
	#endif
	/* Check if this is a new frame. If so, start the frame first */
	if (!header_read) {
	mutex_lock(&gspca_dev->usb_lock);
	ret = jl2005c_start_new_frame(gspca_dev);
	mutex_unlock(&gspca_dev->usb_lock);
	if (ret < 0)
	goto quit_stream;
	ret = usb_bulk_msg(gspca_dev->dev,
	usb_rcvbulkpipe(gspca_dev->dev, 0x82),
	buffer, JL2005C_MAX_TRANSFER, &act_len,
	JL2005C_DATA_TIMEOUT);
	PDEBUG(D_PACK,
	"Got %d bytes out of %d for header",
	act_len, JL2005C_MAX_TRANSFER);
	if (ret < 0 \|\| act_len < JL2005C_MAX_TRANSFER)
	goto quit_stream;
	/* Check whether we actually got the first blodk */
	if (memcmp(header_sig, buffer, 2) != 0) {
	pr_err("First block is not the first block\n");
	goto quit_stream;
	}
	/* total size to fetch is byte 7, times blocksize
	* of which we already got act_len */
	bytes_left = buffer[0x07] * dev->block_size - act_len;
	PDEBUG(D_PACK, "bytes_left = 0x%x", bytes_left);
	/* We keep the header. It has other information, too.*/
	packet_type = FIRST_PACKET;
	gspca_frame_add(gspca_dev, packet_type,
	buffer, act_len);
	header_read = 1;
	}
	while (bytes_left > 0 && gspca_dev->present) {
	data_len = bytes_left > JL2005C_MAX_TRANSFER ?
	JL2005C_MAX_TRANSFER : bytes_left;
	ret = usb_bulk_msg(gspca_dev->dev,
	usb_rcvbulkpipe(gspca_dev->dev, 0x82),
	buffer, data_len, &act_len,
	JL2005C_DATA_TIMEOUT);
	if (ret < 0 \|\| act_len < data_len)
	goto quit_stream;
	PDEBUG(D_PACK,
	"Got %d bytes out of %d for frame",
	data_len, bytes_left);
	bytes_left -= data_len;
	if (bytes_left == 0) {
	packet_type = LAST_PACKET;
	header_read = 0;
	} else
	packet_type = INTER_PACKET;
	gspca_frame_add(gspca_dev, packet_type,
	buffer, data_len);
	}
	}
	quit_stream:
	if (gspca_dev->present) {
	mutex_lock(&gspca_dev->usb_lock);
	jl2005c_stop(gspca_dev);
	mutex_unlock(&gspca_dev->usb_lock);
	}
	kfree(buffer);
	}




	/* 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;
	struct sd sd = (struct sd ) gspca_dev;

	cam = &gspca_dev->cam;
	/* We don't use the buffer gspca allocates so make it small. */
	cam->bulk_size = 64;
	cam->bulk = 1;
	/* For the rest, the camera needs to be detected */
	jl2005c_get_firmware_id(gspca_dev);
	/* Here are some known firmware IDs
	* First some JL2005B cameras
	* {0x41, 0x07, 0x04, 0x2c, 0xe8, 0xf2} Sakar KidzCam
	* {0x45, 0x02, 0x08, 0xb9, 0x00, 0xd2} No-name JL2005B
	* JL2005C cameras
	* {0x01, 0x0c, 0x16, 0x10, 0xf8, 0xc8} Argus DC-1512
	* {0x12, 0x04, 0x03, 0xc0, 0x00, 0xd8} ICarly
	* {0x86, 0x08, 0x05, 0x02, 0x00, 0xd4} Jazz
	*
	* Based upon this scanty evidence, we can detect a CIF camera by
	* testing byte 0 for 0x4x.
	*/
	if ((sd->firmware_id[0] & 0xf0) == 0x40) {
	cam->cam_mode = cif_mode;
	cam->nmodes = ARRAY_SIZE(cif_mode);
	sd->block_size = 0x80;
	} else {
	cam->cam_mode = vga_mode;
	cam->nmodes = ARRAY_SIZE(vga_mode);
	sd->block_size = 0x200;
	}

	INIT_WORK(&sd->work_struct, jl2005c_dostream);

	return 0;
	}

	/* this function is called at probe and resume time */
	static int sd_init(struct gspca_dev *gspca_dev)
	{
	return 0;
	}

	static int sd_start(struct gspca_dev *gspca_dev)
	{

	struct sd sd = (struct sd ) gspca_dev;
	sd->cap_mode = gspca_dev->cam.cam_mode;

	switch (gspca_dev->width) {
	case 640:
	PDEBUG(D_STREAM, "Start streaming at vga resolution");
	jl2005c_stream_start_vga_lg(gspca_dev);
	break;
	case 320:
	PDEBUG(D_STREAM, "Start streaming at qvga resolution");
	jl2005c_stream_start_vga_small(gspca_dev);
	break;
	case 352:
	PDEBUG(D_STREAM, "Start streaming at cif resolution");
	jl2005c_stream_start_cif_lg(gspca_dev);
	break;
	case 176:
	PDEBUG(D_STREAM, "Start streaming at qcif resolution");
	jl2005c_stream_start_cif_small(gspca_dev);
	break;
	default:
	pr_err("Unknown resolution specified\n");
	return -1;
	}

	/* Start the workqueue function to do the streaming */
	sd->work_thread = create_singlethread_workqueue(MODULE_NAME);
	queue_work(sd->work_thread, &sd->work_struct);

	return 0;
	}

	/* called on streamoff with alt==0 and on disconnect */
	/* the usb_lock is held at entry - restore on exit */
	static void sd_stop0(struct gspca_dev *gspca_dev)
	{
	struct sd dev = (struct sd ) gspca_dev;

	/* wait for the work queue to terminate */
	mutex_unlock(&gspca_dev->usb_lock);
	/* This waits for sq905c_dostream to finish */
	destroy_workqueue(dev->work_thread);
	dev->work_thread = NULL;
	mutex_lock(&gspca_dev->usb_lock);
	}



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

	/* -- module initialisation -- */
	static const struct usb_device_id device_table[] = {
	{USB_DEVICE(0x0979, 0x0227)},
	{}
	};
	MODULE_DEVICE_TABLE(usb, device_table);

	/* -- 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 sd),
	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,
	.reset_resume = gspca_resume,
	#endif
	};

	/* -- module insert / remove -- */
	static int __init sd_mod_init(void)
	{
	int ret;

	ret = usb_register(&sd_driver);
	if (ret < 0)
	return ret;
	return 0;
	}
	static void __exit sd_mod_exit(void)
	{
	usb_deregister(&sd_driver);
	}

	module_init(sd_mod_init);
	module_exit(sd_mod_exit);