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