drivers/media/video/gspca/vicam.c

   1 /*
   2  * gspca ViCam subdriver
   3  *
   4  * Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
   5  *
   6  * Based on the usbvideo vicam driver, which is:
   7  *
   8  * Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
   9  *                    Christopher L Cheney (ccheney@cheney.cx),
  10  *                    Pavel Machek (pavel@ucw.cz),
  11  *                    John Tyner (jtyner@cs.ucr.edu),
  12  *                    Monroe Williams (monroe@pobox.com)
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  27  */
  28
  29 #define MODULE_NAME "vicam"
  30 #define HEADER_SIZE 64
  31
  32 #include <linux/workqueue.h>
  33 #include <linux/slab.h>
  34 #include <linux/firmware.h>
  35 #include <linux/ihex.h>
  36 #include "gspca.h"
  37
  38 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
  39 MODULE_DESCRIPTION("GSPCA ViCam USB Camera Driver");
  40 MODULE_LICENSE("GPL");
  41
  42 enum e_ctrl {
  43         GAIN,
  44         EXPOSURE,
  45         NCTRL           /* number of controls */
  46 };
  47
  48 struct sd {
  49         struct gspca_dev gspca_dev;     /* !! must be the first item */
  50         struct work_struct work_struct;
  51         struct workqueue_struct *work_thread;
  52         struct gspca_ctrl ctrls[NCTRL];
  53 };
  54
  55 /* The vicam sensor has a resolution of 512 x 244, with I believe square
  56    pixels, but this is forced to a 4:3 ratio by optics. So it has
  57    non square pixels :( */
  58 static struct v4l2_pix_format vicam_mode[] = {
  59         { 256, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  60                 .bytesperline = 256,
  61                 .sizeimage = 256 * 122,
  62                 .colorspace = V4L2_COLORSPACE_SRGB,},
  63         /* 2 modes with somewhat more square pixels */
  64         { 256, 200, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  65                 .bytesperline = 256,
  66                 .sizeimage = 256 * 200,
  67                 .colorspace = V4L2_COLORSPACE_SRGB,},
  68         { 256, 240, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  69                 .bytesperline = 256,
  70                 .sizeimage = 256 * 240,
  71                 .colorspace = V4L2_COLORSPACE_SRGB,},
  72 #if 0   /* This mode has extremely non square pixels, testing use only */
  73         { 512, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  74                 .bytesperline = 512,
  75                 .sizeimage = 512 * 122,
  76                 .colorspace = V4L2_COLORSPACE_SRGB,},
  77 #endif
  78         { 512, 244, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
  79                 .bytesperline = 512,
  80                 .sizeimage = 512 * 244,
  81                 .colorspace = V4L2_COLORSPACE_SRGB,},
  82 };
  83
  84 static const struct ctrl sd_ctrls[] = {
  85 [GAIN] = {
  86             {
  87                 .id      = V4L2_CID_GAIN,
  88                 .type    = V4L2_CTRL_TYPE_INTEGER,
  89                 .name    = "Gain",
  90                 .minimum = 0,
  91                 .maximum = 255,
  92                 .step    = 1,
  93                 .default_value = 200,
  94             },
  95         },
  96 [EXPOSURE] = {
  97             {
  98                 .id      = V4L2_CID_EXPOSURE,
  99                 .type    = V4L2_CTRL_TYPE_INTEGER,
 100                 .name    = "Exposure",
 101                 .minimum = 0,
 102                 .maximum = 2047,
 103                 .step    = 1,
 104                 .default_value = 256,
 105             },
 106         },
 107 };
 108
 109 static int vicam_control_msg(struct gspca_dev *gspca_dev, u8 request,
 110         u16 value, u16 index, u8 *data, u16 len)
 111 {
 112         int ret;
 113
 114         ret = usb_control_msg(gspca_dev->dev,
 115                               usb_sndctrlpipe(gspca_dev->dev, 0),
 116                               request,
 117                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 118                               value, index, data, len, 1000);
 119         if (ret < 0)
 120                 err("control msg req %02X error %d", request, ret);
 121
 122         return ret;
 123 }
 124
 125 static int vicam_set_camera_power(struct gspca_dev *gspca_dev, int state)
 126 {
 127         int ret;
 128
 129         ret = vicam_control_msg(gspca_dev, 0x50, state, 0, NULL, 0);
 130         if (ret < 0)
 131                 return ret;
 132
 133         if (state)
 134                 ret = vicam_control_msg(gspca_dev, 0x55, 1, 0, NULL, 0);
 135
 136         return ret;
 137 }
 138
 139 /*
 140  *  request and read a block of data - see warning on vicam_command.
 141  */
 142 static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
 143 {
 144         struct sd *sd = (struct sd *)gspca_dev;
 145         int ret, unscaled_height, act_len = 0;
 146         u8 *req_data = gspca_dev->usb_buf;
 147
 148         memset(req_data, 0, 16);
 149         req_data[0] = sd->ctrls[GAIN].val;
 150         if (gspca_dev->width == 256)
 151                 req_data[1] |= 0x01; /* low nibble x-scale */
 152         if (gspca_dev->height <= 122) {
 153                 req_data[1] |= 0x10; /* high nibble y-scale */
 154                 unscaled_height = gspca_dev->height * 2;
 155         } else
 156                 unscaled_height = gspca_dev->height;
 157         req_data[2] = 0x90; /* unknown, does not seem to do anything */
 158         if (unscaled_height <= 200)
 159                 req_data[3] = 0x06; /* vend? */
 160         else if (unscaled_height <= 242) /* Yes 242 not 240 */
 161                 req_data[3] = 0x07; /* vend? */
 162         else /* Up to 244 lines with req_data[3] == 0x08 */
 163                 req_data[3] = 0x08; /* vend? */
 164
 165         if (sd->ctrls[EXPOSURE].val < 256) {
 166                 /* Frame rate maxed out, use partial frame expo time */
 167                 req_data[4] = 255 - sd->ctrls[EXPOSURE].val;
 168                 req_data[5] = 0x00;
 169                 req_data[6] = 0x00;
 170                 req_data[7] = 0x01;
 171         } else {
 172                 /* Modify frame rate */
 173                 req_data[4] = 0x00;
 174                 req_data[5] = 0x00;
 175                 req_data[6] = sd->ctrls[EXPOSURE].val & 0xFF;
 176                 req_data[7] = sd->ctrls[EXPOSURE].val >> 8;
 177         }
 178         req_data[8] = ((244 - unscaled_height) / 2) & ~0x01; /* vstart */
 179         /* bytes 9-15 do not seem to affect exposure or image quality */
 180
 181         mutex_lock(&gspca_dev->usb_lock);
 182         ret = vicam_control_msg(gspca_dev, 0x51, 0x80, 0, req_data, 16);
 183         mutex_unlock(&gspca_dev->usb_lock);
 184         if (ret < 0)
 185                 return ret;
 186
 187         ret = usb_bulk_msg(gspca_dev->dev,
 188                            usb_rcvbulkpipe(gspca_dev->dev, 0x81),
 189                            data, size, &act_len, 10000);
 190         /* successful, it returns 0, otherwise  negative */
 191         if (ret < 0 || act_len != size) {
 192                 err("bulk read fail (%d) len %d/%d",
 193                         ret, act_len, size);
 194                 return -EIO;
 195         }
 196         return 0;
 197 }
 198
 199 /* This function is called as a workqueue function and runs whenever the camera
 200  * is streaming data. Because it is a workqueue function it is allowed to sleep
 201  * so we can use synchronous USB calls. To avoid possible collisions with other
 202  * threads attempting to use the camera's USB interface we take the gspca
 203  * usb_lock when performing USB operations. In practice the only thing we need
 204  * to protect against is the usb_set_interface call that gspca makes during
 205  * stream_off as the camera doesn't provide any controls that the user could try
 206  * to change.
 207  */
 208 static void vicam_dostream(struct work_struct *work)
 209 {
 210         struct sd *sd = container_of(work, struct sd, work_struct);
 211         struct gspca_dev *gspca_dev = &sd->gspca_dev;
 212         int ret, frame_sz;
 213         u8 *buffer;
 214
 215         frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage +
 216                    HEADER_SIZE;
 217         buffer = kmalloc(frame_sz, GFP_KERNEL | GFP_DMA);
 218         if (!buffer) {
 219                 err("Couldn't allocate USB buffer");
 220                 goto exit;
 221         }
 222
 223         while (gspca_dev->present && gspca_dev->streaming) {
 224                 ret = vicam_read_frame(gspca_dev, buffer, frame_sz);
 225                 if (ret < 0)
 226                         break;
 227
 228                 /* Note the frame header contents seem to be completely
 229                    constant, they do not change with either image, or
 230                    settings. So we simply discard it. The frames have
 231                    a very similar 64 byte footer, which we don't even
 232                    bother reading from the cam */
 233                 gspca_frame_add(gspca_dev, FIRST_PACKET,
 234                                 buffer + HEADER_SIZE,
 235                                 frame_sz - HEADER_SIZE);
 236                 gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
 237         }
 238 exit:
 239         kfree(buffer);
 240 }
 241
 242 /* This function is called at probe time just before sd_init */
 243 static int sd_config(struct gspca_dev *gspca_dev,
 244                 const struct usb_device_id *id)
 245 {
 246         struct cam *cam = &gspca_dev->cam;
 247         struct sd *sd = (struct sd *)gspca_dev;
 248
 249         /* We don't use the buffer gspca allocates so make it small. */
 250         cam->bulk = 1;
 251         cam->bulk_size = 64;
 252         cam->cam_mode = vicam_mode;
 253         cam->nmodes = ARRAY_SIZE(vicam_mode);
 254         cam->ctrls = sd->ctrls;
 255
 256         INIT_WORK(&sd->work_struct, vicam_dostream);
 257
 258         return 0;
 259 }
 260
 261 /* this function is called at probe and resume time */
 262 static int sd_init(struct gspca_dev *gspca_dev)
 263 {
 264         int ret;
 265         const struct ihex_binrec *rec;
 266         const struct firmware *uninitialized_var(fw);
 267         u8 *firmware_buf;
 268
 269         ret = request_ihex_firmware(&fw, "vicam/firmware.fw",
 270                                     &gspca_dev->dev->dev);
 271         if (ret) {
 272                 err("Failed to load \"vicam/firmware.fw\": %d\n", ret);
 273                 return ret;
 274         }
 275
 276         firmware_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 277         if (!firmware_buf) {
 278                 ret = -ENOMEM;
 279                 goto exit;
 280         }
 281         for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
 282                 memcpy(firmware_buf, rec->data, be16_to_cpu(rec->len));
 283                 ret = vicam_control_msg(gspca_dev, 0xff, 0, 0, firmware_buf,
 284                                         be16_to_cpu(rec->len));
 285                 if (ret < 0)
 286                         break;
 287         }
 288
 289         kfree(firmware_buf);
 290 exit:
 291         release_firmware(fw);
 292         return ret;
 293 }
 294
 295 /* Set up for getting frames. */
 296 static int sd_start(struct gspca_dev *gspca_dev)
 297 {
 298         struct sd *sd = (struct sd *)gspca_dev;
 299         int ret;
 300
 301         ret = vicam_set_camera_power(gspca_dev, 1);
 302         if (ret < 0)
 303                 return ret;
 304
 305         /* Start the workqueue function to do the streaming */
 306         sd->work_thread = create_singlethread_workqueue(MODULE_NAME);
 307         queue_work(sd->work_thread, &sd->work_struct);
 308
 309         return 0;
 310 }
 311
 312 /* called on streamoff with alt==0 and on disconnect */
 313 /* the usb_lock is held at entry - restore on exit */
 314 static void sd_stop0(struct gspca_dev *gspca_dev)
 315 {
 316         struct sd *dev = (struct sd *)gspca_dev;
 317
 318         /* wait for the work queue to terminate */
 319         mutex_unlock(&gspca_dev->usb_lock);
 320         /* This waits for vicam_dostream to finish */
 321         destroy_workqueue(dev->work_thread);
 322         dev->work_thread = NULL;
 323         mutex_lock(&gspca_dev->usb_lock);
 324
 325         vicam_set_camera_power(gspca_dev, 0);
 326 }
 327
 328 /* Table of supported USB devices */
 329 static const struct usb_device_id device_table[] = {
 330         {USB_DEVICE(0x04c1, 0x009d)},
 331         {USB_DEVICE(0x0602, 0x1001)},
 332         {}
 333 };
 334
 335 MODULE_DEVICE_TABLE(usb, device_table);
 336
 337 /* sub-driver description */
 338 static const struct sd_desc sd_desc = {
 339         .name   = MODULE_NAME,
 340         .ctrls  = sd_ctrls,
 341         .nctrls = ARRAY_SIZE(sd_ctrls),
 342         .config = sd_config,
 343         .init   = sd_init,
 344         .start  = sd_start,
 345         .stop0  = sd_stop0,
 346 };
 347
 348 /* -- device connect -- */
 349 static int sd_probe(struct usb_interface *intf,
 350                 const struct usb_device_id *id)
 351 {
 352         return gspca_dev_probe(intf, id,
 353                         &sd_desc,
 354                         sizeof(struct sd),
 355                         THIS_MODULE);
 356 }
 357
 358 static struct usb_driver sd_driver = {
 359         .name       = MODULE_NAME,
 360         .id_table   = device_table,
 361         .probe      = sd_probe,
 362         .disconnect = gspca_disconnect,
 363 #ifdef CONFIG_PM
 364         .suspend = gspca_suspend,
 365         .resume  = gspca_resume,
 366 #endif
 367 };
 368
 369 /* -- module insert / remove -- */
 370 static int __init sd_mod_init(void)
 371 {
 372         return usb_register(&sd_driver);
 373 }
 374
 375 static void __exit sd_mod_exit(void)
 376 {
 377         usb_deregister(&sd_driver);
 378 }
 379
 380 module_init(sd_mod_init);
 381 module_exit(sd_mod_exit);