drivers/media/usb/gspca/se401.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * GSPCA Endpoints (formerly known as AOX) se401 USB Camera sub Driver
   4  *
   5  * Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
   6  *
   7  * Based on the v4l1 se401 driver which is:
   8  *
   9  * Copyright (c) 2000 Jeroen B. Vreeken (pe1rxq@amsat.org)
  10  */
  11
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #define MODULE_NAME "se401"
  15
  16 #define BULK_SIZE 4096
  17 #define PACKET_SIZE 1024
  18 #define READ_REQ_SIZE 64
  19 #define MAX_MODES ((READ_REQ_SIZE - 6) / 4)
  20 /* The se401 compression algorithm uses a fixed quant factor, which
  21    can be configured by setting the high nibble of the SE401_OPERATINGMODE
  22    feature. This needs to exactly match what is in libv4l! */
  23 #define SE401_QUANT_FACT 8
  24
  25 #include <linux/input.h>
  26 #include <linux/slab.h>
  27 #include "gspca.h"
  28 #include "se401.h"
  29
  30 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
  31 MODULE_DESCRIPTION("Endpoints se401");
  32 MODULE_LICENSE("GPL");
  33
  34 /* exposure change state machine states */
  35 enum {
  36         EXPO_CHANGED,
  37         EXPO_DROP_FRAME,
  38         EXPO_NO_CHANGE,
  39 };
  40
  41 /* specific webcam descriptor */
  42 struct sd {
  43         struct gspca_dev gspca_dev;     /* !! must be the first item */
  44         struct { /* exposure/freq control cluster */
  45                 struct v4l2_ctrl *exposure;
  46                 struct v4l2_ctrl *freq;
  47         };
  48         bool has_brightness;
  49         struct v4l2_pix_format fmts[MAX_MODES];
  50         int pixels_read;
  51         int packet_read;
  52         u8 packet[PACKET_SIZE];
  53         u8 restart_stream;
  54         u8 button_state;
  55         u8 resetlevel;
  56         u8 resetlevel_frame_count;
  57         int resetlevel_adjust_dir;
  58         int expo_change_state;
  59 };
  60
  61
  62 static void se401_write_req(struct gspca_dev *gspca_dev, u16 req, u16 value,
  63                             int silent)
  64 {
  65         int err;
  66
  67         if (gspca_dev->usb_err < 0)
  68                 return;
  69
  70         err = usb_control_msg(gspca_dev->dev,
  71                               usb_sndctrlpipe(gspca_dev->dev, 0), req,
  72                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  73                               value, 0, NULL, 0, 1000);
  74         if (err < 0) {
  75                 if (!silent)
  76                         pr_err("write req failed req %#04x val %#04x error %d\n",
  77                                req, value, err);
  78                 gspca_dev->usb_err = err;
  79         }
  80 }
  81
  82 static void se401_read_req(struct gspca_dev *gspca_dev, u16 req, int silent)
  83 {
  84         int err;
  85
  86         if (gspca_dev->usb_err < 0)
  87                 return;
  88
  89         if (USB_BUF_SZ < READ_REQ_SIZE) {
  90                 pr_err("USB_BUF_SZ too small!!\n");
  91                 gspca_dev->usb_err = -ENOBUFS;
  92                 return;
  93         }
  94
  95         err = usb_control_msg(gspca_dev->dev,
  96                               usb_rcvctrlpipe(gspca_dev->dev, 0), req,
  97                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  98                               0, 0, gspca_dev->usb_buf, READ_REQ_SIZE, 1000);
  99         if (err < 0) {
 100                 if (!silent)
 101                         pr_err("read req failed req %#04x error %d\n",
 102                                req, err);
 103                 gspca_dev->usb_err = err;
 104         }
 105 }
 106
 107 static void se401_set_feature(struct gspca_dev *gspca_dev,
 108                               u16 selector, u16 param)
 109 {
 110         int err;
 111
 112         if (gspca_dev->usb_err < 0)
 113                 return;
 114
 115         err = usb_control_msg(gspca_dev->dev,
 116                               usb_sndctrlpipe(gspca_dev->dev, 0),
 117                               SE401_REQ_SET_EXT_FEATURE,
 118                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 119                               param, selector, NULL, 0, 1000);
 120         if (err < 0) {
 121                 pr_err("set feature failed sel %#04x param %#04x error %d\n",
 122                        selector, param, err);
 123                 gspca_dev->usb_err = err;
 124         }
 125 }
 126
 127 static int se401_get_feature(struct gspca_dev *gspca_dev, u16 selector)
 128 {
 129         int err;
 130
 131         if (gspca_dev->usb_err < 0)
 132                 return gspca_dev->usb_err;
 133
 134         if (USB_BUF_SZ < 2) {
 135                 pr_err("USB_BUF_SZ too small!!\n");
 136                 gspca_dev->usb_err = -ENOBUFS;
 137                 return gspca_dev->usb_err;
 138         }
 139
 140         err = usb_control_msg(gspca_dev->dev,
 141                               usb_rcvctrlpipe(gspca_dev->dev, 0),
 142                               SE401_REQ_GET_EXT_FEATURE,
 143                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 144                               0, selector, gspca_dev->usb_buf, 2, 1000);
 145         if (err < 0) {
 146                 pr_err("get feature failed sel %#04x error %d\n",
 147                        selector, err);
 148                 gspca_dev->usb_err = err;
 149                 return err;
 150         }
 151         return gspca_dev->usb_buf[0] | (gspca_dev->usb_buf[1] << 8);
 152 }
 153
 154 static void setbrightness(struct gspca_dev *gspca_dev, s32 val)
 155 {
 156         /* HDG: this does not seem to do anything on my cam */
 157         se401_write_req(gspca_dev, SE401_REQ_SET_BRT, val, 0);
 158 }
 159
 160 static void setgain(struct gspca_dev *gspca_dev, s32 val)
 161 {
 162         u16 gain = 63 - val;
 163
 164         /* red color gain */
 165         se401_set_feature(gspca_dev, HV7131_REG_ARCG, gain);
 166         /* green color gain */
 167         se401_set_feature(gspca_dev, HV7131_REG_AGCG, gain);
 168         /* blue color gain */
 169         se401_set_feature(gspca_dev, HV7131_REG_ABCG, gain);
 170 }
 171
 172 static void setexposure(struct gspca_dev *gspca_dev, s32 val, s32 freq)
 173 {
 174         struct sd *sd = (struct sd *) gspca_dev;
 175         int integration = val << 6;
 176         u8 expose_h, expose_m, expose_l;
 177
 178         /* Do this before the set_feature calls, for proper timing wrt
 179            the interrupt driven pkt_scan. Note we may still race but that
 180            is not a big issue, the expo change state machine is merely for
 181            avoiding underexposed frames getting send out, if one sneaks
 182            through so be it */
 183         sd->expo_change_state = EXPO_CHANGED;
 184
 185         if (freq == V4L2_CID_POWER_LINE_FREQUENCY_50HZ)
 186                 integration = integration - integration % 106667;
 187         if (freq == V4L2_CID_POWER_LINE_FREQUENCY_60HZ)
 188                 integration = integration - integration % 88889;
 189
 190         expose_h = (integration >> 16);
 191         expose_m = (integration >> 8);
 192         expose_l = integration;
 193
 194         /* integration time low */
 195         se401_set_feature(gspca_dev, HV7131_REG_TITL, expose_l);
 196         /* integration time mid */
 197         se401_set_feature(gspca_dev, HV7131_REG_TITM, expose_m);
 198         /* integration time high */
 199         se401_set_feature(gspca_dev, HV7131_REG_TITU, expose_h);
 200 }
 201
 202 static int sd_config(struct gspca_dev *gspca_dev,
 203                         const struct usb_device_id *id)
 204 {
 205         struct sd *sd = (struct sd *)gspca_dev;
 206         struct cam *cam = &gspca_dev->cam;
 207         u8 *cd = gspca_dev->usb_buf;
 208         int i, j, n;
 209         int widths[MAX_MODES], heights[MAX_MODES];
 210
 211         /* Read the camera descriptor */
 212         se401_read_req(gspca_dev, SE401_REQ_GET_CAMERA_DESCRIPTOR, 1);
 213         if (gspca_dev->usb_err) {
 214                 /* Sometimes after being idle for a while the se401 won't
 215                    respond and needs a good kicking  */
 216                 usb_reset_device(gspca_dev->dev);
 217                 gspca_dev->usb_err = 0;
 218                 se401_read_req(gspca_dev, SE401_REQ_GET_CAMERA_DESCRIPTOR, 0);
 219         }
 220
 221         /* Some cameras start with their LED on */
 222         se401_write_req(gspca_dev, SE401_REQ_LED_CONTROL, 0, 0);
 223         if (gspca_dev->usb_err)
 224                 return gspca_dev->usb_err;
 225
 226         if (cd[1] != 0x41) {
 227                 pr_err("Wrong descriptor type\n");
 228                 return -ENODEV;
 229         }
 230
 231         if (!(cd[2] & SE401_FORMAT_BAYER)) {
 232                 pr_err("Bayer format not supported!\n");
 233                 return -ENODEV;
 234         }
 235
 236         if (cd[3])
 237                 pr_info("ExtraFeatures: %d\n", cd[3]);
 238
 239         n = cd[4] | (cd[5] << 8);
 240         if (n > MAX_MODES) {
 241                 pr_err("Too many frame sizes\n");
 242                 return -ENODEV;
 243         }
 244
 245         for (i = 0; i < n ; i++) {
 246                 widths[i] = cd[6 + i * 4 + 0] | (cd[6 + i * 4 + 1] << 8);
 247                 heights[i] = cd[6 + i * 4 + 2] | (cd[6 + i * 4 + 3] << 8);
 248         }
 249
 250         for (i = 0; i < n ; i++) {
 251                 sd->fmts[i].width = widths[i];
 252                 sd->fmts[i].height = heights[i];
 253                 sd->fmts[i].field = V4L2_FIELD_NONE;
 254                 sd->fmts[i].colorspace = V4L2_COLORSPACE_SRGB;
 255                 sd->fmts[i].priv = 1;
 256
 257                 /* janggu compression only works for 1/4th or 1/16th res */
 258                 for (j = 0; j < n; j++) {
 259                         if (widths[j] / 2 == widths[i] &&
 260                             heights[j] / 2 == heights[i]) {
 261                                 sd->fmts[i].priv = 2;
 262                                 break;
 263                         }
 264                 }
 265                 /* 1/16th if available too is better then 1/4th, because
 266                    we then use a larger area of the sensor */
 267                 for (j = 0; j < n; j++) {
 268                         if (widths[j] / 4 == widths[i] &&
 269                             heights[j] / 4 == heights[i]) {
 270                                 sd->fmts[i].priv = 4;
 271                                 break;
 272                         }
 273                 }
 274
 275                 if (sd->fmts[i].priv == 1) {
 276                         /* Not a 1/4th or 1/16th res, use bayer */
 277                         sd->fmts[i].pixelformat = V4L2_PIX_FMT_SBGGR8;
 278                         sd->fmts[i].bytesperline = widths[i];
 279                         sd->fmts[i].sizeimage = widths[i] * heights[i];
 280                         pr_info("Frame size: %dx%d bayer\n",
 281                                 widths[i], heights[i]);
 282                 } else {
 283                         /* Found a match use janggu compression */
 284                         sd->fmts[i].pixelformat = V4L2_PIX_FMT_SE401;
 285                         sd->fmts[i].bytesperline = 0;
 286                         sd->fmts[i].sizeimage = widths[i] * heights[i] * 3;
 287                         pr_info("Frame size: %dx%d 1/%dth janggu\n",
 288                                 widths[i], heights[i],
 289                                 sd->fmts[i].priv * sd->fmts[i].priv);
 290                 }
 291         }
 292
 293         cam->cam_mode = sd->fmts;
 294         cam->nmodes = n;
 295         cam->bulk = 1;
 296         cam->bulk_size = BULK_SIZE;
 297         cam->bulk_nurbs = 4;
 298         sd->resetlevel = 0x2d; /* Set initial resetlevel */
 299
 300         /* See if the camera supports brightness */
 301         se401_read_req(gspca_dev, SE401_REQ_GET_BRT, 1);
 302         sd->has_brightness = !!gspca_dev->usb_err;
 303         gspca_dev->usb_err = 0;
 304
 305         return 0;
 306 }
 307
 308 /* this function is called at probe and resume time */
 309 static int sd_init(struct gspca_dev *gspca_dev)
 310 {
 311         return 0;
 312 }
 313
 314 /* function called at start time before URB creation */
 315 static int sd_isoc_init(struct gspca_dev *gspca_dev)
 316 {
 317         gspca_dev->alt = 1;     /* Ignore the bogus isoc alt settings */
 318
 319         return gspca_dev->usb_err;
 320 }
 321
 322 /* -- start the camera -- */
 323 static int sd_start(struct gspca_dev *gspca_dev)
 324 {
 325         struct sd *sd = (struct sd *)gspca_dev;
 326         int mult = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].priv;
 327         int mode = 0;
 328
 329         se401_write_req(gspca_dev, SE401_REQ_CAMERA_POWER, 1, 1);
 330         if (gspca_dev->usb_err) {
 331                 /* Sometimes after being idle for a while the se401 won't
 332                    respond and needs a good kicking  */
 333                 usb_reset_device(gspca_dev->dev);
 334                 gspca_dev->usb_err = 0;
 335                 se401_write_req(gspca_dev, SE401_REQ_CAMERA_POWER, 1, 0);
 336         }
 337         se401_write_req(gspca_dev, SE401_REQ_LED_CONTROL, 1, 0);
 338
 339         se401_set_feature(gspca_dev, HV7131_REG_MODE_B, 0x05);
 340
 341         /* set size + mode */
 342         se401_write_req(gspca_dev, SE401_REQ_SET_WIDTH,
 343                         gspca_dev->pixfmt.width * mult, 0);
 344         se401_write_req(gspca_dev, SE401_REQ_SET_HEIGHT,
 345                         gspca_dev->pixfmt.height * mult, 0);
 346         /*
 347          * HDG: disabled this as it does not seem to do anything
 348          * se401_write_req(gspca_dev, SE401_REQ_SET_OUTPUT_MODE,
 349          *                 SE401_FORMAT_BAYER, 0);
 350          */
 351
 352         switch (mult) {
 353         case 1: /* Raw bayer */
 354                 mode = 0x03; break;
 355         case 2: /* 1/4th janggu */
 356                 mode = SE401_QUANT_FACT << 4; break;
 357         case 4: /* 1/16th janggu */
 358                 mode = (SE401_QUANT_FACT << 4) | 0x02; break;
 359         }
 360         se401_set_feature(gspca_dev, SE401_OPERATINGMODE, mode);
 361
 362         se401_set_feature(gspca_dev, HV7131_REG_ARLV, sd->resetlevel);
 363
 364         sd->packet_read = 0;
 365         sd->pixels_read = 0;
 366         sd->restart_stream = 0;
 367         sd->resetlevel_frame_count = 0;
 368         sd->resetlevel_adjust_dir = 0;
 369         sd->expo_change_state = EXPO_NO_CHANGE;
 370
 371         se401_write_req(gspca_dev, SE401_REQ_START_CONTINUOUS_CAPTURE, 0, 0);
 372
 373         return gspca_dev->usb_err;
 374 }
 375
 376 static void sd_stopN(struct gspca_dev *gspca_dev)
 377 {
 378         se401_write_req(gspca_dev, SE401_REQ_STOP_CONTINUOUS_CAPTURE, 0, 0);
 379         se401_write_req(gspca_dev, SE401_REQ_LED_CONTROL, 0, 0);
 380         se401_write_req(gspca_dev, SE401_REQ_CAMERA_POWER, 0, 0);
 381 }
 382
 383 static void sd_dq_callback(struct gspca_dev *gspca_dev)
 384 {
 385         struct sd *sd = (struct sd *)gspca_dev;
 386         unsigned int ahrc, alrc;
 387         int oldreset, adjust_dir;
 388
 389         /* Restart the stream if requested do so by pkt_scan */
 390         if (sd->restart_stream) {
 391                 sd_stopN(gspca_dev);
 392                 sd_start(gspca_dev);
 393                 sd->restart_stream = 0;
 394         }
 395
 396         /* Automatically adjust sensor reset level
 397            Hyundai have some really nice docs about this and other sensor
 398            related stuff on their homepage: www.hei.co.kr */
 399         sd->resetlevel_frame_count++;
 400         if (sd->resetlevel_frame_count < 20)
 401                 return;
 402
 403         /* For some reason this normally read-only register doesn't get reset
 404            to zero after reading them just once... */
 405         se401_get_feature(gspca_dev, HV7131_REG_HIREFNOH);
 406         se401_get_feature(gspca_dev, HV7131_REG_HIREFNOL);
 407         se401_get_feature(gspca_dev, HV7131_REG_LOREFNOH);
 408         se401_get_feature(gspca_dev, HV7131_REG_LOREFNOL);
 409         ahrc = 256*se401_get_feature(gspca_dev, HV7131_REG_HIREFNOH) +
 410             se401_get_feature(gspca_dev, HV7131_REG_HIREFNOL);
 411         alrc = 256*se401_get_feature(gspca_dev, HV7131_REG_LOREFNOH) +
 412             se401_get_feature(gspca_dev, HV7131_REG_LOREFNOL);
 413
 414         /* Not an exact science, but it seems to work pretty well... */
 415         oldreset = sd->resetlevel;
 416         if (alrc > 10) {
 417                 while (alrc >= 10 && sd->resetlevel < 63) {
 418                         sd->resetlevel++;
 419                         alrc /= 2;
 420                 }
 421         } else if (ahrc > 20) {
 422                 while (ahrc >= 20 && sd->resetlevel > 0) {
 423                         sd->resetlevel--;
 424                         ahrc /= 2;
 425                 }
 426         }
 427         /* Detect ping-pong-ing and halve adjustment to avoid overshoot */
 428         if (sd->resetlevel > oldreset)
 429                 adjust_dir = 1;
 430         else
 431                 adjust_dir = -1;
 432         if (sd->resetlevel_adjust_dir &&
 433             sd->resetlevel_adjust_dir != adjust_dir)
 434                 sd->resetlevel = oldreset + (sd->resetlevel - oldreset) / 2;
 435
 436         if (sd->resetlevel != oldreset) {
 437                 sd->resetlevel_adjust_dir = adjust_dir;
 438                 se401_set_feature(gspca_dev, HV7131_REG_ARLV, sd->resetlevel);
 439         }
 440
 441         sd->resetlevel_frame_count = 0;
 442 }
 443
 444 static void sd_complete_frame(struct gspca_dev *gspca_dev, u8 *data, int len)
 445 {
 446         struct sd *sd = (struct sd *)gspca_dev;
 447
 448         switch (sd->expo_change_state) {
 449         case EXPO_CHANGED:
 450                 /* The exposure was changed while this frame
 451                    was being send, so this frame is ok */
 452                 sd->expo_change_state = EXPO_DROP_FRAME;
 453                 break;
 454         case EXPO_DROP_FRAME:
 455                 /* The exposure was changed while this frame
 456                    was being captured, drop it! */
 457                 gspca_dev->last_packet_type = DISCARD_PACKET;
 458                 sd->expo_change_state = EXPO_NO_CHANGE;
 459                 break;
 460         case EXPO_NO_CHANGE:
 461                 break;
 462         }
 463         gspca_frame_add(gspca_dev, LAST_PACKET, data, len);
 464 }
 465
 466 static void sd_pkt_scan_janggu(struct gspca_dev *gspca_dev, u8 *data, int len)
 467 {
 468         struct sd *sd = (struct sd *)gspca_dev;
 469         int imagesize = gspca_dev->pixfmt.width * gspca_dev->pixfmt.height;
 470         int i, plen, bits, pixels, info, count;
 471
 472         if (sd->restart_stream)
 473                 return;
 474
 475         /* Sometimes a 1024 bytes garbage bulk packet is send between frames */
 476         if (gspca_dev->last_packet_type == LAST_PACKET && len == 1024) {
 477                 gspca_dev->last_packet_type = DISCARD_PACKET;
 478                 return;
 479         }
 480
 481         i = 0;
 482         while (i < len) {
 483                 /* Read header if not already be present from prev bulk pkt */
 484                 if (sd->packet_read < 4) {
 485                         count = 4 - sd->packet_read;
 486                         if (count > len - i)
 487                                 count = len - i;
 488                         memcpy(&sd->packet[sd->packet_read], &data[i], count);
 489                         sd->packet_read += count;
 490                         i += count;
 491                         if (sd->packet_read < 4)
 492                                 break;
 493                 }
 494                 bits   = sd->packet[3] + (sd->packet[2] << 8);
 495                 pixels = sd->packet[1] + ((sd->packet[0] & 0x3f) << 8);
 496                 info   = (sd->packet[0] & 0xc0) >> 6;
 497                 plen   = ((bits + 47) >> 4) << 1;
 498                 /* Sanity checks */
 499                 if (plen > 1024) {
 500                         pr_err("invalid packet len %d restarting stream\n",
 501                                plen);
 502                         goto error;
 503                 }
 504                 if (info == 3) {
 505                         pr_err("unknown frame info value restarting stream\n");
 506                         goto error;
 507                 }
 508
 509                 /* Read (remainder of) packet contents */
 510                 count = plen - sd->packet_read;
 511                 if (count > len - i)
 512                         count = len - i;
 513                 memcpy(&sd->packet[sd->packet_read], &data[i], count);
 514                 sd->packet_read += count;
 515                 i += count;
 516                 if (sd->packet_read < plen)
 517                         break;
 518
 519                 sd->pixels_read += pixels;
 520                 sd->packet_read = 0;
 521
 522                 switch (info) {
 523                 case 0: /* Frame data */
 524                         gspca_frame_add(gspca_dev, INTER_PACKET, sd->packet,
 525                                         plen);
 526                         break;
 527                 case 1: /* EOF */
 528                         if (sd->pixels_read != imagesize) {
 529                                 pr_err("frame size %d expected %d\n",
 530                                        sd->pixels_read, imagesize);
 531                                 goto error;
 532                         }
 533                         sd_complete_frame(gspca_dev, sd->packet, plen);
 534                         return; /* Discard the rest of the bulk packet !! */
 535                 case 2: /* SOF */
 536                         gspca_frame_add(gspca_dev, FIRST_PACKET, sd->packet,
 537                                         plen);
 538                         sd->pixels_read = pixels;
 539                         break;
 540                 }
 541         }
 542         return;
 543
 544 error:
 545         sd->restart_stream = 1;
 546         /* Give userspace a 0 bytes frame, so our dq callback gets
 547            called and it can restart the stream */
 548         gspca_frame_add(gspca_dev, FIRST_PACKET, NULL, 0);
 549         gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
 550 }
 551
 552 static void sd_pkt_scan_bayer(struct gspca_dev *gspca_dev, u8 *data, int len)
 553 {
 554         struct cam *cam = &gspca_dev->cam;
 555         int imagesize = cam->cam_mode[gspca_dev->curr_mode].sizeimage;
 556
 557         if (gspca_dev->image_len == 0) {
 558                 gspca_frame_add(gspca_dev, FIRST_PACKET, data, len);
 559                 return;
 560         }
 561
 562         if (gspca_dev->image_len + len >= imagesize) {
 563                 sd_complete_frame(gspca_dev, data, len);
 564                 return;
 565         }
 566
 567         gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
 568 }
 569
 570 static void sd_pkt_scan(struct gspca_dev *gspca_dev, u8 *data, int len)
 571 {
 572         int mult = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].priv;
 573
 574         if (len == 0)
 575                 return;
 576
 577         if (mult == 1) /* mult == 1 means raw bayer */
 578                 sd_pkt_scan_bayer(gspca_dev, data, len);
 579         else
 580                 sd_pkt_scan_janggu(gspca_dev, data, len);
 581 }
 582
 583 #if IS_ENABLED(CONFIG_INPUT)
 584 static int sd_int_pkt_scan(struct gspca_dev *gspca_dev, u8 *data, int len)
 585 {
 586         struct sd *sd = (struct sd *)gspca_dev;
 587         u8 state;
 588
 589         if (len != 2)
 590                 return -EINVAL;
 591
 592         switch (data[0]) {
 593         case 0:
 594         case 1:
 595                 state = data[0];
 596                 break;
 597         default:
 598                 return -EINVAL;
 599         }
 600         if (sd->button_state != state) {
 601                 input_report_key(gspca_dev->input_dev, KEY_CAMERA, state);
 602                 input_sync(gspca_dev->input_dev);
 603                 sd->button_state = state;
 604         }
 605
 606         return 0;
 607 }
 608 #endif
 609
 610 static int sd_s_ctrl(struct v4l2_ctrl *ctrl)
 611 {
 612         struct gspca_dev *gspca_dev =
 613                 container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
 614         struct sd *sd = (struct sd *)gspca_dev;
 615
 616         gspca_dev->usb_err = 0;
 617
 618         if (!gspca_dev->streaming)
 619                 return 0;
 620
 621         switch (ctrl->id) {
 622         case V4L2_CID_BRIGHTNESS:
 623                 setbrightness(gspca_dev, ctrl->val);
 624                 break;
 625         case V4L2_CID_GAIN:
 626                 setgain(gspca_dev, ctrl->val);
 627                 break;
 628         case V4L2_CID_EXPOSURE:
 629                 setexposure(gspca_dev, ctrl->val, sd->freq->val);
 630                 break;
 631         }
 632         return gspca_dev->usb_err;
 633 }
 634
 635 static const struct v4l2_ctrl_ops sd_ctrl_ops = {
 636         .s_ctrl = sd_s_ctrl,
 637 };
 638
 639 static int sd_init_controls(struct gspca_dev *gspca_dev)
 640 {
 641         struct sd *sd = (struct sd *)gspca_dev;
 642         struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;
 643
 644         gspca_dev->vdev.ctrl_handler = hdl;
 645         v4l2_ctrl_handler_init(hdl, 4);
 646         if (sd->has_brightness)
 647                 v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 648                         V4L2_CID_BRIGHTNESS, 0, 255, 1, 15);
 649         /* max is really 63 but > 50 is not pretty */
 650         v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 651                         V4L2_CID_GAIN, 0, 50, 1, 25);
 652         sd->exposure = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 653                         V4L2_CID_EXPOSURE, 0, 32767, 1, 15000);
 654         sd->freq = v4l2_ctrl_new_std_menu(hdl, &sd_ctrl_ops,
 655                         V4L2_CID_POWER_LINE_FREQUENCY,
 656                         V4L2_CID_POWER_LINE_FREQUENCY_60HZ, 0, 0);
 657
 658         if (hdl->error) {
 659                 pr_err("Could not initialize controls\n");
 660                 return hdl->error;
 661         }
 662         v4l2_ctrl_cluster(2, &sd->exposure);
 663         return 0;
 664 }
 665
 666 /* sub-driver description */
 667 static const struct sd_desc sd_desc = {
 668         .name = MODULE_NAME,
 669         .config = sd_config,
 670         .init = sd_init,
 671         .init_controls = sd_init_controls,
 672         .isoc_init = sd_isoc_init,
 673         .start = sd_start,
 674         .stopN = sd_stopN,
 675         .dq_callback = sd_dq_callback,
 676         .pkt_scan = sd_pkt_scan,
 677 #if IS_ENABLED(CONFIG_INPUT)
 678         .int_pkt_scan = sd_int_pkt_scan,
 679 #endif
 680 };
 681
 682 /* -- module initialisation -- */
 683 static const struct usb_device_id device_table[] = {
 684         {USB_DEVICE(0x03e8, 0x0004)}, /* Endpoints/Aox SE401 */
 685         {USB_DEVICE(0x0471, 0x030b)}, /* Philips PCVC665K */
 686         {USB_DEVICE(0x047d, 0x5001)}, /* Kensington 67014 */
 687         {USB_DEVICE(0x047d, 0x5002)}, /* Kensington 6701(5/7) */
 688         {USB_DEVICE(0x047d, 0x5003)}, /* Kensington 67016 */
 689         {}
 690 };
 691 MODULE_DEVICE_TABLE(usb, device_table);
 692
 693 /* -- device connect -- */
 694 static int sd_probe(struct usb_interface *intf,
 695                         const struct usb_device_id *id)
 696 {
 697         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 698                                 THIS_MODULE);
 699 }
 700
 701 static int sd_pre_reset(struct usb_interface *intf)
 702 {
 703         return 0;
 704 }
 705
 706 static int sd_post_reset(struct usb_interface *intf)
 707 {
 708         return 0;
 709 }
 710
 711 static struct usb_driver sd_driver = {
 712         .name = MODULE_NAME,
 713         .id_table = device_table,
 714         .probe = sd_probe,
 715         .disconnect = gspca_disconnect,
 716 #ifdef CONFIG_PM
 717         .suspend = gspca_suspend,
 718         .resume = gspca_resume,
 719         .reset_resume = gspca_resume,
 720 #endif
 721         .pre_reset = sd_pre_reset,
 722         .post_reset = sd_post_reset,
 723 };
 724
 725 module_usb_driver(sd_driver);