--- /dev/null
+/*
+ * 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 "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;
+ struct gspca_frame *frame;
+ int blocks_left; /* 0x200-sized blocks remaining in current frame. */
+ int size_in_blocks;
+ int act_len;
+ int discarding = 0; /* true if we failed to get space for frame. */
+ 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) {
+ if (!gspca_dev->present)
+ goto quit_stream;
+ /* Start a new frame, and add the JPEG header, first thing */
+ frame = gspca_get_i_frame(gspca_dev);
+ if (frame && !discarding)
+ gspca_frame_add(gspca_dev, FIRST_PACKET, frame,
+ dev->jpeg_hdr, JPEG_HDR_SZ);
+ else
+ discarding = 1;
+ /*
+ * 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);
+ packet_type = INTER_PACKET;
+ if (frame && !discarding)
+ /* Toss line 0 of data block 0, keep the rest. */
+ gspca_frame_add(gspca_dev, packet_type,
+ frame, buffer + FRAME_HEADER_LEN,
+ JEILINJ_MAX_TRANSFER - FRAME_HEADER_LEN);
+ else
+ discarding = 1;
+ 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;
+ if (frame && !discarding)
+ gspca_frame_add(gspca_dev, packet_type,
+ frame, buffer,
+ JEILINJ_MAX_TRANSFER);
+ else
+ discarding = 1;
+ }
+ }
+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);
+ 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);
projects / platform / kernel / linux-stable.git / commitdiff