[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / video / gspca / jeilinj.c

/*
 * Jeilinj subdriver
 *
 * Supports some Jeilin dual-mode cameras which use bulk transport and
 * download raw JPEG data.
 *
 * Copyright (C) 2009 Theodore Kilgore
 *
 * 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 "jeilinj"

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

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

/* Default timeouts, in ms */
#define JEILINJ_CMD_TIMEOUT 500
#define JEILINJ_DATA_TIMEOUT 1000

/* Maximum transfer size to use. */
#define JEILINJ_MAX_TRANSFER 0x200

#define FRAME_HEADER_LEN 0x10

/* Structure to hold all of our device specific stuff */
struct sd {
	struct gspca_dev gspca_dev;	/* !! must be the first item */
	const struct v4l2_pix_format *cap_mode;
	/* Driver stuff */
	struct work_struct work_struct;
	struct workqueue_struct *work_thread;
	u8 quality;				 /* image quality */
	u8 jpegqual;				/* webcam quality */
	u8 *jpeg_hdr;
};

	struct jlj_command {
		unsigned char instruction[2];
		unsigned char ack_wanted;
	};

/* AFAICT these cameras will only do 320x240. */
static struct v4l2_pix_format jlj_mode[] = {
	{ 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
		.bytesperline = 320,
		.sizeimage = 320 * 240,
		.colorspace = V4L2_COLORSPACE_JPEG,
		.priv = 0}
};

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

/* All commands are two bytes only */
static int jlj_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)
		PDEBUG(D_ERR, "command write [%02x] error %d",
				gspca_dev->usb_buf[0], retval);
	return retval;
}

/* Responses are one byte only */
static int jlj_read1(struct gspca_dev *gspca_dev, unsigned char response)
{
	int retval;

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

static int jlj_start(struct gspca_dev *gspca_dev)
{
	int i;
	int retval = -1;
	u8 response = 0xff;
	struct jlj_command start_commands[] = {
		{{0x71, 0x81}, 0},
		{{0x70, 0x05}, 0},
		{{0x95, 0x70}, 1},
		{{0x71, 0x81}, 0},
		{{0x70, 0x04}, 0},
		{{0x95, 0x70}, 1},
		{{0x71, 0x00}, 0},
		{{0x70, 0x08}, 0},
		{{0x95, 0x70}, 1},
		{{0x94, 0x02}, 0},
		{{0xde, 0x24}, 0},
		{{0x94, 0x02}, 0},
		{{0xdd, 0xf0}, 0},
		{{0x94, 0x02}, 0},
		{{0xe3, 0x2c}, 0},
		{{0x94, 0x02}, 0},
		{{0xe4, 0x00}, 0},
		{{0x94, 0x02}, 0},
		{{0xe5, 0x00}, 0},
		{{0x94, 0x02}, 0},
		{{0xe6, 0x2c}, 0},
		{{0x94, 0x03}, 0},
		{{0xaa, 0x00}, 0},
		{{0x71, 0x1e}, 0},
		{{0x70, 0x06}, 0},
		{{0x71, 0x80}, 0},
		{{0x70, 0x07}, 0}
	};
	for (i = 0; i < ARRAY_SIZE(start_commands); i++) {
		retval = jlj_write2(gspca_dev, start_commands[i].instruction);
		if (retval < 0)
			return retval;
		if (start_commands[i].ack_wanted)
			retval = jlj_read1(gspca_dev, response);
		if (retval < 0)
			return retval;
	}
	PDEBUG(D_ERR, "jlj_start retval is %d", retval);
	return retval;
}

static int jlj_stop(struct gspca_dev *gspca_dev)
{
	int i;
	int retval;
	struct jlj_command stop_commands[] = {
		{{0x71, 0x00}, 0},
		{{0x70, 0x09}, 0},
		{{0x71, 0x80}, 0},
		{{0x70, 0x05}, 0}
	};
	for (i = 0; i < ARRAY_SIZE(stop_commands); i++) {
		retval = jlj_write2(gspca_dev, stop_commands[i].instruction);
		if (retval < 0)
			return retval;
	}
	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 the camera's USB interface the gspca usb_lock is
 * used when performing the one USB control operation inside the workqueue,
 * which tells the camera to close the stream. In practice the only thing
 * which needs to be protected against is the usb_set_interface call that
 * gspca makes during stream_off. Otherwise the camera doesn't provide any
 * controls that the user could try to change.
 */

static void jlj_dostream(struct work_struct *work)
{
	struct sd *dev = container_of(work, struct sd, work_struct);
	struct gspca_dev *gspca_dev = &dev->gspca_dev;
	int blocks_left; /* 0x200-sized blocks remaining in current frame. */
	int size_in_blocks;
	int act_len;
	int packet_type;
	int ret;
	u8 *buffer;

	buffer = kmalloc(JEILINJ_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
	if (!buffer) {
		PDEBUG(D_ERR, "Couldn't allocate USB buffer");
		goto quit_stream;
	}
	while (gspca_dev->present && gspca_dev->streaming) {
		/*
		 * Now request data block 0. Line 0 reports the size
		 * to download, in blocks of size 0x200, and also tells the
		 * "actual" data size, in bytes, which seems best to ignore.
		 */
		ret = usb_bulk_msg(gspca_dev->dev,
				usb_rcvbulkpipe(gspca_dev->dev, 0x82),
				buffer, JEILINJ_MAX_TRANSFER, &act_len,
				JEILINJ_DATA_TIMEOUT);
		PDEBUG(D_STREAM,
			"Got %d bytes out of %d for Block 0",
			act_len, JEILINJ_MAX_TRANSFER);
		if (ret < 0 || act_len < FRAME_HEADER_LEN)
			goto quit_stream;
		size_in_blocks = buffer[0x0a];
		blocks_left = buffer[0x0a] - 1;
		PDEBUG(D_STREAM, "blocks_left = 0x%x", blocks_left);

		/* Start a new frame, and add the JPEG header, first thing */
		gspca_frame_add(gspca_dev, FIRST_PACKET,
				dev->jpeg_hdr, JPEG_HDR_SZ);
		/* Toss line 0 of data block 0, keep the rest. */
		gspca_frame_add(gspca_dev, INTER_PACKET,
				buffer + FRAME_HEADER_LEN,
				JEILINJ_MAX_TRANSFER - FRAME_HEADER_LEN);

		while (blocks_left > 0) {
			if (!gspca_dev->present)
				goto quit_stream;
			ret = usb_bulk_msg(gspca_dev->dev,
				usb_rcvbulkpipe(gspca_dev->dev, 0x82),
				buffer, JEILINJ_MAX_TRANSFER, &act_len,
				JEILINJ_DATA_TIMEOUT);
			if (ret < 0 || act_len < JEILINJ_MAX_TRANSFER)
				goto quit_stream;
			PDEBUG(D_STREAM,
				"%d blocks remaining for frame", blocks_left);
			blocks_left -= 1;
			if (blocks_left == 0)
				packet_type = LAST_PACKET;
			else
				packet_type = INTER_PACKET;
			gspca_frame_add(gspca_dev, packet_type,
					buffer, JEILINJ_MAX_TRANSFER);
		}
	}
quit_stream:
	mutex_lock(&gspca_dev->usb_lock);
	if (gspca_dev->present)
		jlj_stop(gspca_dev);
	mutex_unlock(&gspca_dev->usb_lock);
	kfree(buffer);
}

/* This function is called at probe time just before sd_init */
static int sd_config(struct gspca_dev *gspca_dev,
		const struct usb_device_id *id)
{
	struct cam *cam = &gspca_dev->cam;
	struct sd *dev  = (struct sd *) gspca_dev;

	dev->quality  = 85;
	dev->jpegqual = 85;
	PDEBUG(D_PROBE,
		"JEILINJ camera detected"
		" (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
	cam->cam_mode = jlj_mode;
	cam->nmodes = 1;
	cam->bulk = 1;
	/* We don't use the buffer gspca allocates so make it small. */
	cam->bulk_size = 32;
	INIT_WORK(&dev->work_struct, jlj_dostream);
	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 jlj_dostream to finish */
	destroy_workqueue(dev->work_thread);
	dev->work_thread = NULL;
	mutex_lock(&gspca_dev->usb_lock);
	kfree(dev->jpeg_hdr);
}

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

/* Set up for getting frames. */
static int sd_start(struct gspca_dev *gspca_dev)
{
	struct sd *dev = (struct sd *) gspca_dev;
	int ret;

	/* create the JPEG header */
	dev->jpeg_hdr = kmalloc(JPEG_HDR_SZ, GFP_KERNEL);
	if (dev->jpeg_hdr == NULL)
		return -ENOMEM;
	jpeg_define(dev->jpeg_hdr, gspca_dev->height, gspca_dev->width,
			0x21);          /* JPEG 422 */
	jpeg_set_qual(dev->jpeg_hdr, dev->quality);
	PDEBUG(D_STREAM, "Start streaming at 320x240");
	ret = jlj_start(gspca_dev);
	if (ret < 0) {
		PDEBUG(D_ERR, "Start streaming command failed");
		return ret;
	}
	/* Start the workqueue function to do the streaming */
	dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
	queue_work(dev->work_thread, &dev->work_struct);

	return 0;
}

/* Table of supported USB devices */
static const __devinitdata struct usb_device_id device_table[] = {
	{USB_DEVICE(0x0979, 0x0280)},
	{}
};

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,
	.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 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,
#endif
};

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

	ret = usb_register(&sd_driver);
	if (ret < 0)
		return ret;
	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);
Commit	Line	Data
3040b043 TK	1	/*
	2	* Jeilinj subdriver
	3	*
	4	* Supports some Jeilin dual-mode cameras which use bulk transport and
	5	* download raw JPEG data.
	6	*
	7	* Copyright (C) 2009 Theodore Kilgore
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	22	*/
	23
	24	#define MODULE_NAME "jeilinj"
	25
	26	#include <linux/workqueue.h>
5a0e3ad6	27	#include <linux/slab.h>
3040b043 TK	28	#include "gspca.h"
	29	#include "jpeg.h"
	30
	31	MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
	32	MODULE_DESCRIPTION("GSPCA/JEILINJ USB Camera Driver");
	33	MODULE_LICENSE("GPL");
	34
	35	/* Default timeouts, in ms */
	36	#define JEILINJ_CMD_TIMEOUT 500
	37	#define JEILINJ_DATA_TIMEOUT 1000
	38
	39	/* Maximum transfer size to use. */
	40	#define JEILINJ_MAX_TRANSFER 0x200
	41
	42	#define FRAME_HEADER_LEN 0x10
	43
	44	/* Structure to hold all of our device specific stuff */
	45	struct sd {
	46	struct gspca_dev gspca_dev; /* !! must be the first item */
	47	const struct v4l2_pix_format *cap_mode;
	48	/* Driver stuff */
	49	struct work_struct work_struct;
	50	struct workqueue_struct *work_thread;
	51	u8 quality; /* image quality */
	52	u8 jpegqual; /* webcam quality */
	53	u8 *jpeg_hdr;
	54	};
	55
	56	struct jlj_command {
	57	unsigned char instruction[2];
	58	unsigned char ack_wanted;
	59	};
	60
	61	/* AFAICT these cameras will only do 320x240. */
	62	static struct v4l2_pix_format jlj_mode[] = {
	63	{ 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
	64	.bytesperline = 320,
	65	.sizeimage = 320 * 240,
	66	.colorspace = V4L2_COLORSPACE_JPEG,
	67	.priv = 0}
	68	};
	69
	70	/*
	71	* cam uses endpoint 0x03 to send commands, 0x84 for read commands,
	72	* and 0x82 for bulk transfer.
	73	*/
	74
	75	/* All commands are two bytes only */
	76	static int jlj_write2(struct gspca_dev gspca_dev, unsigned char command)
	77	{
	78	int retval;
	79
	80	memcpy(gspca_dev->usb_buf, command, 2);
	81	retval = usb_bulk_msg(gspca_dev->dev,
	82	usb_sndbulkpipe(gspca_dev->dev, 3),
	83	gspca_dev->usb_buf, 2, NULL, 500);
	84	if (retval < 0)
	85	PDEBUG(D_ERR, "command write [%02x] error %d",
	86	gspca_dev->usb_buf[0], retval);
	87	return retval;
	88	}
	89
	90	/* Responses are one byte only */
	91	static int jlj_read1(struct gspca_dev *gspca_dev, unsigned char response)
92	{
93	int retval;
94
95	retval = usb_bulk_msg(gspca_dev->dev,
96	usb_rcvbulkpipe(gspca_dev->dev, 0x84),
97	gspca_dev->usb_buf, 1, NULL, 500);
98	response = gspca_dev->usb_buf[0];
99	if (retval < 0)
100	PDEBUG(D_ERR, "read command [%02x] error %d",
101	gspca_dev->usb_buf[0], retval);
102	return retval;
103	}
104
105	static int jlj_start(struct gspca_dev *gspca_dev)
106	{
107	int i;
108	int retval = -1;
109	u8 response = 0xff;
110	struct jlj_command start_commands[] = {
111	{{0x71, 0x81}, 0},
112	{{0x70, 0x05}, 0},
113	{{0x95, 0x70}, 1},
114	{{0x71, 0x81}, 0},
115	{{0x70, 0x04}, 0},
116	{{0x95, 0x70}, 1},
117	{{0x71, 0x00}, 0},
118	{{0x70, 0x08}, 0},
119	{{0x95, 0x70}, 1},
120	{{0x94, 0x02}, 0},
121	{{0xde, 0x24}, 0},
122	{{0x94, 0x02}, 0},
123	{{0xdd, 0xf0}, 0},
124	{{0x94, 0x02}, 0},
125	{{0xe3, 0x2c}, 0},
126	{{0x94, 0x02}, 0},
127	{{0xe4, 0x00}, 0},
128	{{0x94, 0x02}, 0},
129	{{0xe5, 0x00}, 0},
130	{{0x94, 0x02}, 0},
131	{{0xe6, 0x2c}, 0},
132	{{0x94, 0x03}, 0},
133	{{0xaa, 0x00}, 0},
134	{{0x71, 0x1e}, 0},
135	{{0x70, 0x06}, 0},
136	{{0x71, 0x80}, 0},
137	{{0x70, 0x07}, 0}
138	};
139	for (i = 0; i < ARRAY_SIZE(start_commands); i++) {
140	retval = jlj_write2(gspca_dev, start_commands[i].instruction);
141	if (retval < 0)
142	return retval;
143	if (start_commands[i].ack_wanted)
144	retval = jlj_read1(gspca_dev, response);
145	if (retval < 0)
146	return retval;
147	}
148	PDEBUG(D_ERR, "jlj_start retval is %d", retval);
149	return retval;
150	}
151
152	static int jlj_stop(struct gspca_dev *gspca_dev)
153	{
154	int i;
155	int retval;
156	struct jlj_command stop_commands[] = {
157	{{0x71, 0x00}, 0},
158	{{0x70, 0x09}, 0},
159	{{0x71, 0x80}, 0},
160	{{0x70, 0x05}, 0}
161	};
162	for (i = 0; i < ARRAY_SIZE(stop_commands); i++) {
163	retval = jlj_write2(gspca_dev, stop_commands[i].instruction);
164	if (retval < 0)
165	return retval;
166	}
167	return retval;
168	}
169
170	/* This function is called as a workqueue function and runs whenever the camera
171	* is streaming data. Because it is a workqueue function it is allowed to sleep
172	* so we can use synchronous USB calls. To avoid possible collisions with other
173	* threads attempting to use the camera's USB interface the gspca usb_lock is
174	* used when performing the one USB control operation inside the workqueue,
175	* which tells the camera to close the stream. In practice the only thing
176	* which needs to be protected against is the usb_set_interface call that
177	* gspca makes during stream_off. Otherwise the camera doesn't provide any
178	* controls that the user could try to change.
179	*/
180
181	static void jlj_dostream(struct work_struct *work)
182	{
183	struct sd *dev = container_of(work, struct sd, work_struct);
184	struct gspca_dev *gspca_dev = &dev->gspca_dev;
3040b043 TK	185	int blocks_left; /* 0x200-sized blocks remaining in current frame. */
	186	int size_in_blocks;
	187	int act_len;
3040b043 TK	188	int packet_type;
	189	int ret;
	190	u8 *buffer;
	191
	192	buffer = kmalloc(JEILINJ_MAX_TRANSFER, GFP_KERNEL \| GFP_DMA);
	193	if (!buffer) {
	194	PDEBUG(D_ERR, "Couldn't allocate USB buffer");
	195	goto quit_stream;
	196	}
	197	while (gspca_dev->present && gspca_dev->streaming) {
3040b043 TK	198	/*
	199	* Now request data block 0. Line 0 reports the size
	200	* to download, in blocks of size 0x200, and also tells the
	201	* "actual" data size, in bytes, which seems best to ignore.
	202	*/
	203	ret = usb_bulk_msg(gspca_dev->dev,
	204	usb_rcvbulkpipe(gspca_dev->dev, 0x82),
	205	buffer, JEILINJ_MAX_TRANSFER, &act_len,
	206	JEILINJ_DATA_TIMEOUT);
	207	PDEBUG(D_STREAM,
	208	"Got %d bytes out of %d for Block 0",
	209	act_len, JEILINJ_MAX_TRANSFER);
	210	if (ret < 0 \|\| act_len < FRAME_HEADER_LEN)
	211	goto quit_stream;
	212	size_in_blocks = buffer[0x0a];
	213	blocks_left = buffer[0x0a] - 1;
	214	PDEBUG(D_STREAM, "blocks_left = 0x%x", blocks_left);
6ca3f255 HG	215
6ca3f255 HG	216	/* Start a new frame, and add the JPEG header, first thing */
76dd272b JFM	217	gspca_frame_add(gspca_dev, FIRST_PACKET,
	218	dev->jpeg_hdr, JPEG_HDR_SZ);
	219	/* Toss line 0 of data block 0, keep the rest. */
	220	gspca_frame_add(gspca_dev, INTER_PACKET,
	221	buffer + FRAME_HEADER_LEN,
3040b043	222	JEILINJ_MAX_TRANSFER - FRAME_HEADER_LEN);
76dd272b	223
3040b043 TK	224	while (blocks_left > 0) {
	225	if (!gspca_dev->present)
	226	goto quit_stream;
	227	ret = usb_bulk_msg(gspca_dev->dev,
	228	usb_rcvbulkpipe(gspca_dev->dev, 0x82),
	229	buffer, JEILINJ_MAX_TRANSFER, &act_len,
	230	JEILINJ_DATA_TIMEOUT);
	231	if (ret < 0 \|\| act_len < JEILINJ_MAX_TRANSFER)
	232	goto quit_stream;
	233	PDEBUG(D_STREAM,
	234	"%d blocks remaining for frame", blocks_left);
	235	blocks_left -= 1;
	236	if (blocks_left == 0)
	237	packet_type = LAST_PACKET;
	238	else
	239	packet_type = INTER_PACKET;
76dd272b JFM	240	gspca_frame_add(gspca_dev, packet_type,
76dd272b JFM	241	buffer, JEILINJ_MAX_TRANSFER);
3040b043 TK	242	}
	243	}
	244	quit_stream:
	245	mutex_lock(&gspca_dev->usb_lock);
	246	if (gspca_dev->present)
	247	jlj_stop(gspca_dev);
	248	mutex_unlock(&gspca_dev->usb_lock);
	249	kfree(buffer);
	250	}
	251
	252	/* This function is called at probe time just before sd_init */
	253	static int sd_config(struct gspca_dev *gspca_dev,
	254	const struct usb_device_id *id)
	255	{
	256	struct cam *cam = &gspca_dev->cam;
	257	struct sd dev = (struct sd ) gspca_dev;
	258
	259	dev->quality = 85;
	260	dev->jpegqual = 85;
	261	PDEBUG(D_PROBE,
	262	"JEILINJ camera detected"
	263	" (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
	264	cam->cam_mode = jlj_mode;
	265	cam->nmodes = 1;
	266	cam->bulk = 1;
	267	/* We don't use the buffer gspca allocates so make it small. */
	268	cam->bulk_size = 32;
	269	INIT_WORK(&dev->work_struct, jlj_dostream);
	270	return 0;
	271	}
	272
	273	/* called on streamoff with alt==0 and on disconnect */
	274	/* the usb_lock is held at entry - restore on exit */
	275	static void sd_stop0(struct gspca_dev *gspca_dev)
	276	{
	277	struct sd dev = (struct sd ) gspca_dev;
	278
	279	/* wait for the work queue to terminate */
	280	mutex_unlock(&gspca_dev->usb_lock);
	281	/* This waits for jlj_dostream to finish */
	282	destroy_workqueue(dev->work_thread);
	283	dev->work_thread = NULL;
	284	mutex_lock(&gspca_dev->usb_lock);
	285	kfree(dev->jpeg_hdr);
	286	}
	287
	288	/* this function is called at probe and resume time */
	289	static int sd_init(struct gspca_dev *gspca_dev)
	290	{
	291	return 0;
	292	}
	293
	294	/* Set up for getting frames. */
	295	static int sd_start(struct gspca_dev *gspca_dev)
	296	{
	297	struct sd dev = (struct sd ) gspca_dev;
	298	int ret;
	299
	300	/* create the JPEG header */
	301	dev->jpeg_hdr = kmalloc(JPEG_HDR_SZ, GFP_KERNEL);
d8370f7e RK	302	if (dev->jpeg_hdr == NULL)
d8370f7e RK	303	return -ENOMEM;
3040b043 TK	304	jpeg_define(dev->jpeg_hdr, gspca_dev->height, gspca_dev->width,
	305	0x21); /* JPEG 422 */
	306	jpeg_set_qual(dev->jpeg_hdr, dev->quality);
	307	PDEBUG(D_STREAM, "Start streaming at 320x240");
	308	ret = jlj_start(gspca_dev);
	309	if (ret < 0) {
	310	PDEBUG(D_ERR, "Start streaming command failed");
	311	return ret;
	312	}
	313	/* Start the workqueue function to do the streaming */
	314	dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
	315	queue_work(dev->work_thread, &dev->work_struct);
	316
	317	return 0;
	318	}
	319
	320	/* Table of supported USB devices */
	321	static const __devinitdata struct usb_device_id device_table[] = {
	322	{USB_DEVICE(0x0979, 0x0280)},
	323	{}
	324	};
	325
	326	MODULE_DEVICE_TABLE(usb, device_table);
	327
	328	/* sub-driver description */
	329	static const struct sd_desc sd_desc = {
	330	.name = MODULE_NAME,
	331	.config = sd_config,
	332	.init = sd_init,
	333	.start = sd_start,
	334	.stop0 = sd_stop0,
	335	};
	336
	337	/* -- device connect -- */
	338	static int sd_probe(struct usb_interface *intf,
	339	const struct usb_device_id *id)
	340	{
	341	return gspca_dev_probe(intf, id,
	342	&sd_desc,
	343	sizeof(struct sd),
	344	THIS_MODULE);
	345	}
	346
	347	static struct usb_driver sd_driver = {
	348	.name = MODULE_NAME,
	349	.id_table = device_table,
	350	.probe = sd_probe,
	351	.disconnect = gspca_disconnect,
	352	#ifdef CONFIG_PM
	353	.suspend = gspca_suspend,
	354	.resume = gspca_resume,
	355	#endif
	356	};
	357
	358	/* -- module insert / remove -- */
	359	static int __init sd_mod_init(void)
	360	{
	361	int ret;
	362
	363	ret = usb_register(&sd_driver);
	364	if (ret < 0)
	365	return ret;
	366	PDEBUG(D_PROBE, "registered");
	367	return 0;
368	}
369
370	static void __exit sd_mod_exit(void)
371	{
372	usb_deregister(&sd_driver);
373	PDEBUG(D_PROBE, "deregistered");
374	}
375
376	module_init(sd_mod_init);
377	module_exit(sd_mod_exit);