drivers/media/video/gspca/jeilinj.c

   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>
  27 #include <linux/slab.h>
  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[JPEG_HDR_SZ];
  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                 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                 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;
 185         int blocks_left; /* 0x200-sized blocks remaining in current frame. */
 186         int act_len;
 187         int packet_type;
 188         int ret;
 189         u8 *buffer;
 190
 191         buffer = kmalloc(JEILINJ_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
 192         if (!buffer) {
 193                 err("Couldn't allocate USB buffer");
 194                 goto quit_stream;
 195         }
 196         while (gspca_dev->present && gspca_dev->streaming) {
 197                 /*
 198                  * Now request data block 0. Line 0 reports the size
 199                  * to download, in blocks of size 0x200, and also tells the
 200                  * "actual" data size, in bytes, which seems best to ignore.
 201                  */
 202                 ret = usb_bulk_msg(gspca_dev->dev,
 203                                 usb_rcvbulkpipe(gspca_dev->dev, 0x82),
 204                                 buffer, JEILINJ_MAX_TRANSFER, &act_len,
 205                                 JEILINJ_DATA_TIMEOUT);
 206                 PDEBUG(D_STREAM,
 207                         "Got %d bytes out of %d for Block 0",
 208                         act_len, JEILINJ_MAX_TRANSFER);
 209                 if (ret < 0 || act_len < FRAME_HEADER_LEN)
 210                         goto quit_stream;
 211                 blocks_left = buffer[0x0a] - 1;
 212                 PDEBUG(D_STREAM, "blocks_left = 0x%x", blocks_left);
 213
 214                 /* Start a new frame, and add the JPEG header, first thing */
 215                 gspca_frame_add(gspca_dev, FIRST_PACKET,
 216                                 dev->jpeg_hdr, JPEG_HDR_SZ);
 217                 /* Toss line 0 of data block 0, keep the rest. */
 218                 gspca_frame_add(gspca_dev, INTER_PACKET,
 219                                 buffer + FRAME_HEADER_LEN,
 220                                 JEILINJ_MAX_TRANSFER - FRAME_HEADER_LEN);
 221
 222                 while (blocks_left > 0) {
 223                         if (!gspca_dev->present)
 224                                 goto quit_stream;
 225                         ret = usb_bulk_msg(gspca_dev->dev,
 226                                 usb_rcvbulkpipe(gspca_dev->dev, 0x82),
 227                                 buffer, JEILINJ_MAX_TRANSFER, &act_len,
 228                                 JEILINJ_DATA_TIMEOUT);
 229                         if (ret < 0 || act_len < JEILINJ_MAX_TRANSFER)
 230                                 goto quit_stream;
 231                         PDEBUG(D_STREAM,
 232                                 "%d blocks remaining for frame", blocks_left);
 233                         blocks_left -= 1;
 234                         if (blocks_left == 0)
 235                                 packet_type = LAST_PACKET;
 236                         else
 237                                 packet_type = INTER_PACKET;
 238                         gspca_frame_add(gspca_dev, packet_type,
 239                                         buffer, JEILINJ_MAX_TRANSFER);
 240                 }
 241         }
 242 quit_stream:
 243         mutex_lock(&gspca_dev->usb_lock);
 244         if (gspca_dev->present)
 245                 jlj_stop(gspca_dev);
 246         mutex_unlock(&gspca_dev->usb_lock);
 247         kfree(buffer);
 248 }
 249
 250 /* This function is called at probe time just before sd_init */
 251 static int sd_config(struct gspca_dev *gspca_dev,
 252                 const struct usb_device_id *id)
 253 {
 254         struct cam *cam = &gspca_dev->cam;
 255         struct sd *dev  = (struct sd *) gspca_dev;
 256
 257         dev->quality  = 85;
 258         dev->jpegqual = 85;
 259         PDEBUG(D_PROBE,
 260                 "JEILINJ camera detected"
 261                 " (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
 262         cam->cam_mode = jlj_mode;
 263         cam->nmodes = 1;
 264         cam->bulk = 1;
 265         /* We don't use the buffer gspca allocates so make it small. */
 266         cam->bulk_size = 32;
 267         INIT_WORK(&dev->work_struct, jlj_dostream);
 268         return 0;
 269 }
 270
 271 /* called on streamoff with alt==0 and on disconnect */
 272 /* the usb_lock is held at entry - restore on exit */
 273 static void sd_stop0(struct gspca_dev *gspca_dev)
 274 {
 275         struct sd *dev = (struct sd *) gspca_dev;
 276
 277         /* wait for the work queue to terminate */
 278         mutex_unlock(&gspca_dev->usb_lock);
 279         /* This waits for jlj_dostream to finish */
 280         destroy_workqueue(dev->work_thread);
 281         dev->work_thread = NULL;
 282         mutex_lock(&gspca_dev->usb_lock);
 283 }
 284
 285 /* this function is called at probe and resume time */
 286 static int sd_init(struct gspca_dev *gspca_dev)
 287 {
 288         return 0;
 289 }
 290
 291 /* Set up for getting frames. */
 292 static int sd_start(struct gspca_dev *gspca_dev)
 293 {
 294         struct sd *dev = (struct sd *) gspca_dev;
 295         int ret;
 296
 297         /* create the JPEG header */
 298         jpeg_define(dev->jpeg_hdr, gspca_dev->height, gspca_dev->width,
 299                         0x21);          /* JPEG 422 */
 300         jpeg_set_qual(dev->jpeg_hdr, dev->quality);
 301         PDEBUG(D_STREAM, "Start streaming at 320x240");
 302         ret = jlj_start(gspca_dev);
 303         if (ret < 0) {
 304                 PDEBUG(D_ERR, "Start streaming command failed");
 305                 return ret;
 306         }
 307         /* Start the workqueue function to do the streaming */
 308         dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
 309         queue_work(dev->work_thread, &dev->work_struct);
 310
 311         return 0;
 312 }
 313
 314 /* Table of supported USB devices */
 315 static const struct usb_device_id device_table[] = {
 316         {USB_DEVICE(0x0979, 0x0280)},
 317         {}
 318 };
 319
 320 MODULE_DEVICE_TABLE(usb, device_table);
 321
 322 /* sub-driver description */
 323 static const struct sd_desc sd_desc = {
 324         .name   = MODULE_NAME,
 325         .config = sd_config,
 326         .init   = sd_init,
 327         .start  = sd_start,
 328         .stop0  = sd_stop0,
 329 };
 330
 331 /* -- device connect -- */
 332 static int sd_probe(struct usb_interface *intf,
 333                 const struct usb_device_id *id)
 334 {
 335         return gspca_dev_probe(intf, id,
 336                         &sd_desc,
 337                         sizeof(struct sd),
 338                         THIS_MODULE);
 339 }
 340
 341 static struct usb_driver sd_driver = {
 342         .name       = MODULE_NAME,
 343         .id_table   = device_table,
 344         .probe      = sd_probe,
 345         .disconnect = gspca_disconnect,
 346 #ifdef CONFIG_PM
 347         .suspend = gspca_suspend,
 348         .resume  = gspca_resume,
 349 #endif
 350 };
 351
 352 /* -- module insert / remove -- */
 353 static int __init sd_mod_init(void)
 354 {
 355         return usb_register(&sd_driver);
 356 }
 357
 358 static void __exit sd_mod_exit(void)
 359 {
 360         usb_deregister(&sd_driver);
 361 }
 362
 363 module_init(sd_mod_init);
 364 module_exit(sd_mod_exit);