/*
* 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);
