377 lines
10 KiB
C
377 lines
10 KiB
C
/*
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* Jeilinj subdriver
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*
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* Supports some Jeilin dual-mode cameras which use bulk transport and
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* download raw JPEG data.
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*
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* Copyright (C) 2009 Theodore Kilgore
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define MODULE_NAME "jeilinj"
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#include <linux/workqueue.h>
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#include "gspca.h"
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#include "jpeg.h"
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MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
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MODULE_DESCRIPTION("GSPCA/JEILINJ USB Camera Driver");
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MODULE_LICENSE("GPL");
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/* Default timeouts, in ms */
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#define JEILINJ_CMD_TIMEOUT 500
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#define JEILINJ_DATA_TIMEOUT 1000
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/* Maximum transfer size to use. */
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#define JEILINJ_MAX_TRANSFER 0x200
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#define FRAME_HEADER_LEN 0x10
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/* Structure to hold all of our device specific stuff */
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struct sd {
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struct gspca_dev gspca_dev; /* !! must be the first item */
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const struct v4l2_pix_format *cap_mode;
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/* Driver stuff */
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struct work_struct work_struct;
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struct workqueue_struct *work_thread;
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u8 quality; /* image quality */
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u8 jpegqual; /* webcam quality */
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u8 *jpeg_hdr;
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};
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struct jlj_command {
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unsigned char instruction[2];
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unsigned char ack_wanted;
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};
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/* AFAICT these cameras will only do 320x240. */
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static struct v4l2_pix_format jlj_mode[] = {
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{ 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
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.bytesperline = 320,
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.sizeimage = 320 * 240,
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.colorspace = V4L2_COLORSPACE_JPEG,
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.priv = 0}
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};
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/*
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* cam uses endpoint 0x03 to send commands, 0x84 for read commands,
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* and 0x82 for bulk transfer.
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*/
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/* All commands are two bytes only */
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static int jlj_write2(struct gspca_dev *gspca_dev, unsigned char *command)
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{
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int retval;
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memcpy(gspca_dev->usb_buf, command, 2);
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retval = usb_bulk_msg(gspca_dev->dev,
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usb_sndbulkpipe(gspca_dev->dev, 3),
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gspca_dev->usb_buf, 2, NULL, 500);
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if (retval < 0)
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PDEBUG(D_ERR, "command write [%02x] error %d",
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gspca_dev->usb_buf[0], retval);
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return retval;
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}
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/* Responses are one byte only */
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static int jlj_read1(struct gspca_dev *gspca_dev, unsigned char response)
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{
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int retval;
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retval = usb_bulk_msg(gspca_dev->dev,
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usb_rcvbulkpipe(gspca_dev->dev, 0x84),
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gspca_dev->usb_buf, 1, NULL, 500);
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response = gspca_dev->usb_buf[0];
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if (retval < 0)
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PDEBUG(D_ERR, "read command [%02x] error %d",
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gspca_dev->usb_buf[0], retval);
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return retval;
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}
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static int jlj_start(struct gspca_dev *gspca_dev)
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{
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int i;
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int retval = -1;
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u8 response = 0xff;
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struct jlj_command start_commands[] = {
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{{0x71, 0x81}, 0},
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{{0x70, 0x05}, 0},
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{{0x95, 0x70}, 1},
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{{0x71, 0x81}, 0},
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{{0x70, 0x04}, 0},
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{{0x95, 0x70}, 1},
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{{0x71, 0x00}, 0},
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{{0x70, 0x08}, 0},
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{{0x95, 0x70}, 1},
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{{0x94, 0x02}, 0},
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{{0xde, 0x24}, 0},
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{{0x94, 0x02}, 0},
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{{0xdd, 0xf0}, 0},
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{{0x94, 0x02}, 0},
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{{0xe3, 0x2c}, 0},
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{{0x94, 0x02}, 0},
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{{0xe4, 0x00}, 0},
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{{0x94, 0x02}, 0},
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{{0xe5, 0x00}, 0},
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{{0x94, 0x02}, 0},
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{{0xe6, 0x2c}, 0},
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{{0x94, 0x03}, 0},
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{{0xaa, 0x00}, 0},
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{{0x71, 0x1e}, 0},
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{{0x70, 0x06}, 0},
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{{0x71, 0x80}, 0},
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{{0x70, 0x07}, 0}
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};
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for (i = 0; i < ARRAY_SIZE(start_commands); i++) {
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retval = jlj_write2(gspca_dev, start_commands[i].instruction);
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if (retval < 0)
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return retval;
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if (start_commands[i].ack_wanted)
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retval = jlj_read1(gspca_dev, response);
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if (retval < 0)
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return retval;
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}
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PDEBUG(D_ERR, "jlj_start retval is %d", retval);
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return retval;
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}
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static int jlj_stop(struct gspca_dev *gspca_dev)
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{
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int i;
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int retval;
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struct jlj_command stop_commands[] = {
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{{0x71, 0x00}, 0},
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{{0x70, 0x09}, 0},
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{{0x71, 0x80}, 0},
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{{0x70, 0x05}, 0}
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};
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for (i = 0; i < ARRAY_SIZE(stop_commands); i++) {
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retval = jlj_write2(gspca_dev, stop_commands[i].instruction);
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if (retval < 0)
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return retval;
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}
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return retval;
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}
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/* This function is called as a workqueue function and runs whenever the camera
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* is streaming data. Because it is a workqueue function it is allowed to sleep
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* so we can use synchronous USB calls. To avoid possible collisions with other
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* threads attempting to use the camera's USB interface the gspca usb_lock is
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* used when performing the one USB control operation inside the workqueue,
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* which tells the camera to close the stream. In practice the only thing
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* which needs to be protected against is the usb_set_interface call that
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* gspca makes during stream_off. Otherwise the camera doesn't provide any
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* controls that the user could try to change.
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*/
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static void jlj_dostream(struct work_struct *work)
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{
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struct sd *dev = container_of(work, struct sd, work_struct);
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struct gspca_dev *gspca_dev = &dev->gspca_dev;
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int blocks_left; /* 0x200-sized blocks remaining in current frame. */
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int size_in_blocks;
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int act_len;
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int packet_type;
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int ret;
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u8 *buffer;
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buffer = kmalloc(JEILINJ_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
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if (!buffer) {
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PDEBUG(D_ERR, "Couldn't allocate USB buffer");
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goto quit_stream;
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}
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while (gspca_dev->present && gspca_dev->streaming) {
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/*
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* Now request data block 0. Line 0 reports the size
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* to download, in blocks of size 0x200, and also tells the
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* "actual" data size, in bytes, which seems best to ignore.
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*/
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ret = usb_bulk_msg(gspca_dev->dev,
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usb_rcvbulkpipe(gspca_dev->dev, 0x82),
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buffer, JEILINJ_MAX_TRANSFER, &act_len,
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JEILINJ_DATA_TIMEOUT);
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PDEBUG(D_STREAM,
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"Got %d bytes out of %d for Block 0",
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act_len, JEILINJ_MAX_TRANSFER);
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if (ret < 0 || act_len < FRAME_HEADER_LEN)
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goto quit_stream;
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size_in_blocks = buffer[0x0a];
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blocks_left = buffer[0x0a] - 1;
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PDEBUG(D_STREAM, "blocks_left = 0x%x", blocks_left);
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/* Start a new frame, and add the JPEG header, first thing */
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gspca_frame_add(gspca_dev, FIRST_PACKET,
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dev->jpeg_hdr, JPEG_HDR_SZ);
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/* Toss line 0 of data block 0, keep the rest. */
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gspca_frame_add(gspca_dev, INTER_PACKET,
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buffer + FRAME_HEADER_LEN,
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JEILINJ_MAX_TRANSFER - FRAME_HEADER_LEN);
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while (blocks_left > 0) {
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if (!gspca_dev->present)
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goto quit_stream;
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ret = usb_bulk_msg(gspca_dev->dev,
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usb_rcvbulkpipe(gspca_dev->dev, 0x82),
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buffer, JEILINJ_MAX_TRANSFER, &act_len,
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JEILINJ_DATA_TIMEOUT);
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if (ret < 0 || act_len < JEILINJ_MAX_TRANSFER)
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goto quit_stream;
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PDEBUG(D_STREAM,
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"%d blocks remaining for frame", blocks_left);
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blocks_left -= 1;
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if (blocks_left == 0)
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packet_type = LAST_PACKET;
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else
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packet_type = INTER_PACKET;
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gspca_frame_add(gspca_dev, packet_type,
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buffer, JEILINJ_MAX_TRANSFER);
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}
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}
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quit_stream:
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mutex_lock(&gspca_dev->usb_lock);
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if (gspca_dev->present)
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jlj_stop(gspca_dev);
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mutex_unlock(&gspca_dev->usb_lock);
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kfree(buffer);
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}
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/* This function is called at probe time just before sd_init */
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static int sd_config(struct gspca_dev *gspca_dev,
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const struct usb_device_id *id)
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{
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struct cam *cam = &gspca_dev->cam;
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struct sd *dev = (struct sd *) gspca_dev;
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dev->quality = 85;
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dev->jpegqual = 85;
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PDEBUG(D_PROBE,
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"JEILINJ camera detected"
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" (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
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cam->cam_mode = jlj_mode;
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cam->nmodes = 1;
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cam->bulk = 1;
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/* We don't use the buffer gspca allocates so make it small. */
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cam->bulk_size = 32;
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INIT_WORK(&dev->work_struct, jlj_dostream);
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return 0;
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}
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/* called on streamoff with alt==0 and on disconnect */
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/* the usb_lock is held at entry - restore on exit */
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static void sd_stop0(struct gspca_dev *gspca_dev)
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{
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struct sd *dev = (struct sd *) gspca_dev;
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/* wait for the work queue to terminate */
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mutex_unlock(&gspca_dev->usb_lock);
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/* This waits for jlj_dostream to finish */
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destroy_workqueue(dev->work_thread);
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dev->work_thread = NULL;
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mutex_lock(&gspca_dev->usb_lock);
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kfree(dev->jpeg_hdr);
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}
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/* this function is called at probe and resume time */
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static int sd_init(struct gspca_dev *gspca_dev)
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{
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return 0;
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}
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/* Set up for getting frames. */
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static int sd_start(struct gspca_dev *gspca_dev)
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{
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struct sd *dev = (struct sd *) gspca_dev;
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int ret;
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/* create the JPEG header */
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dev->jpeg_hdr = kmalloc(JPEG_HDR_SZ, GFP_KERNEL);
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if (dev->jpeg_hdr == NULL)
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return -ENOMEM;
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jpeg_define(dev->jpeg_hdr, gspca_dev->height, gspca_dev->width,
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0x21); /* JPEG 422 */
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jpeg_set_qual(dev->jpeg_hdr, dev->quality);
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PDEBUG(D_STREAM, "Start streaming at 320x240");
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ret = jlj_start(gspca_dev);
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if (ret < 0) {
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PDEBUG(D_ERR, "Start streaming command failed");
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return ret;
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}
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/* Start the workqueue function to do the streaming */
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dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
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queue_work(dev->work_thread, &dev->work_struct);
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return 0;
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}
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/* Table of supported USB devices */
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static const __devinitdata struct usb_device_id device_table[] = {
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{USB_DEVICE(0x0979, 0x0280)},
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{}
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};
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MODULE_DEVICE_TABLE(usb, device_table);
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/* sub-driver description */
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static const struct sd_desc sd_desc = {
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.name = MODULE_NAME,
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.config = sd_config,
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.init = sd_init,
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.start = sd_start,
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.stop0 = sd_stop0,
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};
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/* -- device connect -- */
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static int sd_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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return gspca_dev_probe(intf, id,
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&sd_desc,
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sizeof(struct sd),
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THIS_MODULE);
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}
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static struct usb_driver sd_driver = {
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.name = MODULE_NAME,
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.id_table = device_table,
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.probe = sd_probe,
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.disconnect = gspca_disconnect,
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#ifdef CONFIG_PM
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.suspend = gspca_suspend,
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.resume = gspca_resume,
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#endif
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};
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/* -- module insert / remove -- */
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static int __init sd_mod_init(void)
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{
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int ret;
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ret = usb_register(&sd_driver);
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if (ret < 0)
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return ret;
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PDEBUG(D_PROBE, "registered");
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return 0;
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}
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static void __exit sd_mod_exit(void)
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{
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usb_deregister(&sd_driver);
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PDEBUG(D_PROBE, "deregistered");
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}
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module_init(sd_mod_init);
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module_exit(sd_mod_exit);
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