drivers/input/touchscreen/sur40.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Surface2.0/SUR40/PixelSense input driver
   4  *
   5  * Copyright (c) 2014 by Florian 'floe' Echtler <floe@butterbrot.org>
   6  *
   7  * Derived from the USB Skeleton driver 1.1,
   8  * Copyright (c) 2003 Greg Kroah-Hartman (greg@kroah.com)
   9  *
  10  * and from the Apple USB BCM5974 multitouch driver,
  11  * Copyright (c) 2008 Henrik Rydberg (rydberg@euromail.se)
  12  *
  13  * and from the generic hid-multitouch driver,
  14  * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
  15  *
  16  * and from the v4l2-pci-skeleton driver,
  17  * Copyright (c) Copyright 2014 Cisco Systems, Inc.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/delay.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/module.h>
  26 #include <linux/completion.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/usb.h>
  29 #include <linux/printk.h>
  30 #include <linux/input.h>
  31 #include <linux/input/mt.h>
  32 #include <linux/usb/input.h>
  33 #include <linux/videodev2.h>
  34 #include <media/v4l2-device.h>
  35 #include <media/v4l2-dev.h>
  36 #include <media/v4l2-ioctl.h>
  37 #include <media/v4l2-ctrls.h>
  38 #include <media/videobuf2-v4l2.h>
  39 #include <media/videobuf2-dma-sg.h>
  40
  41 /* read 512 bytes from endpoint 0x86 -> get header + blobs */
  42 struct sur40_header {
  43
  44         __le16 type;       /* always 0x0001 */
  45         __le16 count;      /* count of blobs (if 0: continue prev. packet) */
  46
  47         __le32 packet_id;  /* unique ID for all packets in one frame */
  48
  49         __le32 timestamp;  /* milliseconds (inc. by 16 or 17 each frame) */
  50         __le32 unknown;    /* "epoch?" always 02/03 00 00 00 */
  51
  52 } __packed;
  53
  54 struct sur40_blob {
  55
  56         __le16 blob_id;
  57
  58         u8 action;         /* 0x02 = enter/exit, 0x03 = update (?) */
  59         u8 type;           /* bitmask (0x01 blob,  0x02 touch, 0x04 tag) */
  60
  61         __le16 bb_pos_x;   /* upper left corner of bounding box */
  62         __le16 bb_pos_y;
  63
  64         __le16 bb_size_x;  /* size of bounding box */
  65         __le16 bb_size_y;
  66
  67         __le16 pos_x;      /* finger tip position */
  68         __le16 pos_y;
  69
  70         __le16 ctr_x;      /* centroid position */
  71         __le16 ctr_y;
  72
  73         __le16 axis_x;     /* somehow related to major/minor axis, mostly: */
  74         __le16 axis_y;     /* axis_x == bb_size_y && axis_y == bb_size_x */
  75
  76         __le32 angle;      /* orientation in radians relative to x axis -
  77                               actually an IEEE754 float, don't use in kernel */
  78
  79         __le32 area;       /* size in pixels/pressure (?) */
  80
  81         u8 padding[24];
  82
  83         __le32 tag_id;     /* valid when type == 0x04 (SUR40_TAG) */
  84         __le32 unknown;
  85
  86 } __packed;
  87
  88 /* combined header/blob data */
  89 struct sur40_data {
  90         struct sur40_header header;
  91         struct sur40_blob   blobs[];
  92 } __packed;
  93
  94 /* read 512 bytes from endpoint 0x82 -> get header below
  95  * continue reading 16k blocks until header.size bytes read */
  96 struct sur40_image_header {
  97         __le32 magic;     /* "SUBF" */
  98         __le32 packet_id;
  99         __le32 size;      /* always 0x0007e900 = 960x540 */
 100         __le32 timestamp; /* milliseconds (increases by 16 or 17 each frame) */
 101         __le32 unknown;   /* "epoch?" always 02/03 00 00 00 */
 102 } __packed;
 103
 104 /* version information */
 105 #define DRIVER_SHORT   "sur40"
 106 #define DRIVER_LONG    "Samsung SUR40"
 107 #define DRIVER_AUTHOR  "Florian 'floe' Echtler <floe@butterbrot.org>"
 108 #define DRIVER_DESC    "Surface2.0/SUR40/PixelSense input driver"
 109
 110 /* vendor and device IDs */
 111 #define ID_MICROSOFT 0x045e
 112 #define ID_SUR40     0x0775
 113
 114 /* sensor resolution */
 115 #define SENSOR_RES_X 1920
 116 #define SENSOR_RES_Y 1080
 117
 118 /* touch data endpoint */
 119 #define TOUCH_ENDPOINT 0x86
 120
 121 /* video data endpoint */
 122 #define VIDEO_ENDPOINT 0x82
 123
 124 /* video header fields */
 125 #define VIDEO_HEADER_MAGIC 0x46425553
 126 #define VIDEO_PACKET_SIZE  16384
 127
 128 /* polling interval (ms) */
 129 #define POLL_INTERVAL 1
 130
 131 /* maximum number of contacts FIXME: this is a guess? */
 132 #define MAX_CONTACTS 64
 133
 134 /* control commands */
 135 #define SUR40_GET_VERSION 0xb0 /* 12 bytes string    */
 136 #define SUR40_ACCEL_CAPS  0xb3 /*  5 bytes           */
 137 #define SUR40_SENSOR_CAPS 0xc1 /* 24 bytes           */
 138
 139 #define SUR40_POKE        0xc5 /* poke register byte */
 140 #define SUR40_PEEK        0xc4 /* 48 bytes registers */
 141
 142 #define SUR40_GET_STATE   0xc5 /*  4 bytes state (?) */
 143 #define SUR40_GET_SENSORS 0xb1 /*  8 bytes sensors   */
 144
 145 #define SUR40_BLOB      0x01
 146 #define SUR40_TOUCH     0x02
 147 #define SUR40_TAG       0x04
 148
 149 /* video controls */
 150 #define SUR40_BRIGHTNESS_MAX 0xff
 151 #define SUR40_BRIGHTNESS_MIN 0x00
 152 #define SUR40_BRIGHTNESS_DEF 0xff
 153
 154 #define SUR40_CONTRAST_MAX 0x0f
 155 #define SUR40_CONTRAST_MIN 0x00
 156 #define SUR40_CONTRAST_DEF 0x0a
 157
 158 #define SUR40_GAIN_MAX 0x09
 159 #define SUR40_GAIN_MIN 0x00
 160 #define SUR40_GAIN_DEF 0x08
 161
 162 #define SUR40_BACKLIGHT_MAX 0x01
 163 #define SUR40_BACKLIGHT_MIN 0x00
 164 #define SUR40_BACKLIGHT_DEF 0x01
 165
 166 #define sur40_str(s) #s
 167 #define SUR40_PARAM_RANGE(lo, hi) " (range " sur40_str(lo) "-" sur40_str(hi) ")"
 168
 169 /* module parameters */
 170 static uint brightness = SUR40_BRIGHTNESS_DEF;
 171 module_param(brightness, uint, 0644);
 172 MODULE_PARM_DESC(brightness, "set initial brightness"
 173         SUR40_PARAM_RANGE(SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX));
 174 static uint contrast = SUR40_CONTRAST_DEF;
 175 module_param(contrast, uint, 0644);
 176 MODULE_PARM_DESC(contrast, "set initial contrast"
 177         SUR40_PARAM_RANGE(SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX));
 178 static uint gain = SUR40_GAIN_DEF;
 179 module_param(gain, uint, 0644);
 180 MODULE_PARM_DESC(gain, "set initial gain"
 181         SUR40_PARAM_RANGE(SUR40_GAIN_MIN, SUR40_GAIN_MAX));
 182
 183 static const struct v4l2_pix_format sur40_pix_format[] = {
 184         {
 185                 .pixelformat = V4L2_TCH_FMT_TU08,
 186                 .width  = SENSOR_RES_X / 2,
 187                 .height = SENSOR_RES_Y / 2,
 188                 .field = V4L2_FIELD_NONE,
 189                 .colorspace = V4L2_COLORSPACE_RAW,
 190                 .bytesperline = SENSOR_RES_X / 2,
 191                 .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
 192         },
 193         {
 194                 .pixelformat = V4L2_PIX_FMT_GREY,
 195                 .width  = SENSOR_RES_X / 2,
 196                 .height = SENSOR_RES_Y / 2,
 197                 .field = V4L2_FIELD_NONE,
 198                 .colorspace = V4L2_COLORSPACE_RAW,
 199                 .bytesperline = SENSOR_RES_X / 2,
 200                 .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
 201         }
 202 };
 203
 204 /* master device state */
 205 struct sur40_state {
 206
 207         struct usb_device *usbdev;
 208         struct device *dev;
 209         struct input_dev *input;
 210
 211         struct v4l2_device v4l2;
 212         struct video_device vdev;
 213         struct mutex lock;
 214         struct v4l2_pix_format pix_fmt;
 215         struct v4l2_ctrl_handler hdl;
 216
 217         struct vb2_queue queue;
 218         struct list_head buf_list;
 219         spinlock_t qlock;
 220         int sequence;
 221
 222         struct sur40_data *bulk_in_buffer;
 223         size_t bulk_in_size;
 224         u8 bulk_in_epaddr;
 225         u8 vsvideo;
 226
 227         char phys[64];
 228 };
 229
 230 struct sur40_buffer {
 231         struct vb2_v4l2_buffer vb;
 232         struct list_head list;
 233 };
 234
 235 /* forward declarations */
 236 static const struct video_device sur40_video_device;
 237 static const struct vb2_queue sur40_queue;
 238 static void sur40_process_video(struct sur40_state *sur40);
 239 static int sur40_s_ctrl(struct v4l2_ctrl *ctrl);
 240
 241 static const struct v4l2_ctrl_ops sur40_ctrl_ops = {
 242         .s_ctrl = sur40_s_ctrl,
 243 };
 244
 245 /*
 246  * Note: an earlier, non-public version of this driver used USB_RECIP_ENDPOINT
 247  * here by mistake which is very likely to have corrupted the firmware EEPROM
 248  * on two separate SUR40 devices. Thanks to Alan Stern who spotted this bug.
 249  * Should you ever run into a similar problem, the background story to this
 250  * incident and instructions on how to fix the corrupted EEPROM are available
 251  * at https://floe.butterbrot.org/matrix/hacking/surface/brick.html
 252 */
 253
 254 /* command wrapper */
 255 static int sur40_command(struct sur40_state *dev,
 256                          u8 command, u16 index, void *buffer, u16 size)
 257 {
 258         return usb_control_msg(dev->usbdev, usb_rcvctrlpipe(dev->usbdev, 0),
 259                                command,
 260                                USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 261                                0x00, index, buffer, size, 1000);
 262 }
 263
 264 /* poke a byte in the panel register space */
 265 static int sur40_poke(struct sur40_state *dev, u8 offset, u8 value)
 266 {
 267         int result;
 268         u8 index = 0x96; // 0xae for permanent write
 269
 270         result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
 271                 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 272                 0x32, index, NULL, 0, 1000);
 273         if (result < 0)
 274                 goto error;
 275         msleep(5);
 276
 277         result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
 278                 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 279                 0x72, offset, NULL, 0, 1000);
 280         if (result < 0)
 281                 goto error;
 282         msleep(5);
 283
 284         result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
 285                 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 286                 0xb2, value, NULL, 0, 1000);
 287         if (result < 0)
 288                 goto error;
 289         msleep(5);
 290
 291 error:
 292         return result;
 293 }
 294
 295 static int sur40_set_preprocessor(struct sur40_state *dev, u8 value)
 296 {
 297         u8 setting_07[2] = { 0x01, 0x00 };
 298         u8 setting_17[2] = { 0x85, 0x80 };
 299         int result;
 300
 301         if (value > 1)
 302                 return -ERANGE;
 303
 304         result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
 305                 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 306                 0x07, setting_07[value], NULL, 0, 1000);
 307         if (result < 0)
 308                 goto error;
 309         msleep(5);
 310
 311         result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
 312                 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 313                 0x17, setting_17[value], NULL, 0, 1000);
 314         if (result < 0)
 315                 goto error;
 316         msleep(5);
 317
 318 error:
 319         return result;
 320 }
 321
 322 static void sur40_set_vsvideo(struct sur40_state *handle, u8 value)
 323 {
 324         int i;
 325
 326         for (i = 0; i < 4; i++)
 327                 sur40_poke(handle, 0x1c+i, value);
 328         handle->vsvideo = value;
 329 }
 330
 331 static void sur40_set_irlevel(struct sur40_state *handle, u8 value)
 332 {
 333         int i;
 334
 335         for (i = 0; i < 8; i++)
 336                 sur40_poke(handle, 0x08+(2*i), value);
 337 }
 338
 339 /* Initialization routine, called from sur40_open */
 340 static int sur40_init(struct sur40_state *dev)
 341 {
 342         int result;
 343         u8 *buffer;
 344
 345         buffer = kmalloc(24, GFP_KERNEL);
 346         if (!buffer) {
 347                 result = -ENOMEM;
 348                 goto error;
 349         }
 350
 351         /* stupidly replay the original MS driver init sequence */
 352         result = sur40_command(dev, SUR40_GET_VERSION, 0x00, buffer, 12);
 353         if (result < 0)
 354                 goto error;
 355
 356         result = sur40_command(dev, SUR40_GET_VERSION, 0x01, buffer, 12);
 357         if (result < 0)
 358                 goto error;
 359
 360         result = sur40_command(dev, SUR40_GET_VERSION, 0x02, buffer, 12);
 361         if (result < 0)
 362                 goto error;
 363
 364         result = sur40_command(dev, SUR40_SENSOR_CAPS, 0x00, buffer, 24);
 365         if (result < 0)
 366                 goto error;
 367
 368         result = sur40_command(dev, SUR40_ACCEL_CAPS, 0x00, buffer, 5);
 369         if (result < 0)
 370                 goto error;
 371
 372         result = sur40_command(dev, SUR40_GET_VERSION, 0x03, buffer, 12);
 373         if (result < 0)
 374                 goto error;
 375
 376         result = 0;
 377
 378         /*
 379          * Discard the result buffer - no known data inside except
 380          * some version strings, maybe extract these sometime...
 381          */
 382 error:
 383         kfree(buffer);
 384         return result;
 385 }
 386
 387 /*
 388  * Callback routines from input_dev
 389  */
 390
 391 /* Enable the device, polling will now start. */
 392 static int sur40_open(struct input_dev *input)
 393 {
 394         struct sur40_state *sur40 = input_get_drvdata(input);
 395
 396         dev_dbg(sur40->dev, "open\n");
 397         return sur40_init(sur40);
 398 }
 399
 400 /* Disable device, polling has stopped. */
 401 static void sur40_close(struct input_dev *input)
 402 {
 403         struct sur40_state *sur40 = input_get_drvdata(input);
 404
 405         dev_dbg(sur40->dev, "close\n");
 406         /*
 407          * There is no known way to stop the device, so we simply
 408          * stop polling.
 409          */
 410 }
 411
 412 /*
 413  * This function is called when a whole contact has been processed,
 414  * so that it can assign it to a slot and store the data there.
 415  */
 416 static void sur40_report_blob(struct sur40_blob *blob, struct input_dev *input)
 417 {
 418         int wide, major, minor;
 419         int bb_size_x, bb_size_y, pos_x, pos_y, ctr_x, ctr_y, slotnum;
 420
 421         if (blob->type != SUR40_TOUCH)
 422                 return;
 423
 424         slotnum = input_mt_get_slot_by_key(input, blob->blob_id);
 425         if (slotnum < 0 || slotnum >= MAX_CONTACTS)
 426                 return;
 427
 428         bb_size_x = le16_to_cpu(blob->bb_size_x);
 429         bb_size_y = le16_to_cpu(blob->bb_size_y);
 430
 431         pos_x = le16_to_cpu(blob->pos_x);
 432         pos_y = le16_to_cpu(blob->pos_y);
 433
 434         ctr_x = le16_to_cpu(blob->ctr_x);
 435         ctr_y = le16_to_cpu(blob->ctr_y);
 436
 437         input_mt_slot(input, slotnum);
 438         input_mt_report_slot_state(input, MT_TOOL_FINGER, 1);
 439         wide = (bb_size_x > bb_size_y);
 440         major = max(bb_size_x, bb_size_y);
 441         minor = min(bb_size_x, bb_size_y);
 442
 443         input_report_abs(input, ABS_MT_POSITION_X, pos_x);
 444         input_report_abs(input, ABS_MT_POSITION_Y, pos_y);
 445         input_report_abs(input, ABS_MT_TOOL_X, ctr_x);
 446         input_report_abs(input, ABS_MT_TOOL_Y, ctr_y);
 447
 448         /* TODO: use a better orientation measure */
 449         input_report_abs(input, ABS_MT_ORIENTATION, wide);
 450         input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
 451         input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
 452 }
 453
 454 /* core function: poll for new input data */
 455 static void sur40_poll(struct input_dev *input)
 456 {
 457         struct sur40_state *sur40 = input_get_drvdata(input);
 458         int result, bulk_read, need_blobs, packet_blobs, i;
 459         u32 uninitialized_var(packet_id);
 460
 461         struct sur40_header *header = &sur40->bulk_in_buffer->header;
 462         struct sur40_blob *inblob = &sur40->bulk_in_buffer->blobs[0];
 463
 464         dev_dbg(sur40->dev, "poll\n");
 465
 466         need_blobs = -1;
 467
 468         do {
 469
 470                 /* perform a blocking bulk read to get data from the device */
 471                 result = usb_bulk_msg(sur40->usbdev,
 472                         usb_rcvbulkpipe(sur40->usbdev, sur40->bulk_in_epaddr),
 473                         sur40->bulk_in_buffer, sur40->bulk_in_size,
 474                         &bulk_read, 1000);
 475
 476                 dev_dbg(sur40->dev, "received %d bytes\n", bulk_read);
 477
 478                 if (result < 0) {
 479                         dev_err(sur40->dev, "error in usb_bulk_read\n");
 480                         return;
 481                 }
 482
 483                 result = bulk_read - sizeof(struct sur40_header);
 484
 485                 if (result % sizeof(struct sur40_blob) != 0) {
 486                         dev_err(sur40->dev, "transfer size mismatch\n");
 487                         return;
 488                 }
 489
 490                 /* first packet? */
 491                 if (need_blobs == -1) {
 492                         need_blobs = le16_to_cpu(header->count);
 493                         dev_dbg(sur40->dev, "need %d blobs\n", need_blobs);
 494                         packet_id = le32_to_cpu(header->packet_id);
 495                 }
 496
 497                 /*
 498                  * Sanity check. when video data is also being retrieved, the
 499                  * packet ID will usually increase in the middle of a series
 500                  * instead of at the end. However, the data is still consistent,
 501                  * so the packet ID is probably just valid for the first packet
 502                  * in a series.
 503
 504                 if (packet_id != le32_to_cpu(header->packet_id))
 505                         dev_dbg(sur40->dev, "packet ID mismatch\n");
 506                  */
 507
 508                 packet_blobs = result / sizeof(struct sur40_blob);
 509                 dev_dbg(sur40->dev, "received %d blobs\n", packet_blobs);
 510
 511                 /* packets always contain at least 4 blobs, even if empty */
 512                 if (packet_blobs > need_blobs)
 513                         packet_blobs = need_blobs;
 514
 515                 for (i = 0; i < packet_blobs; i++) {
 516                         need_blobs--;
 517                         dev_dbg(sur40->dev, "processing blob\n");
 518                         sur40_report_blob(&(inblob[i]), input);
 519                 }
 520
 521         } while (need_blobs > 0);
 522
 523         input_mt_sync_frame(input);
 524         input_sync(input);
 525
 526         sur40_process_video(sur40);
 527 }
 528
 529 /* deal with video data */
 530 static void sur40_process_video(struct sur40_state *sur40)
 531 {
 532
 533         struct sur40_image_header *img = (void *)(sur40->bulk_in_buffer);
 534         struct sur40_buffer *new_buf;
 535         struct usb_sg_request sgr;
 536         struct sg_table *sgt;
 537         int result, bulk_read;
 538
 539         if (!vb2_start_streaming_called(&sur40->queue))
 540                 return;
 541
 542         /* get a new buffer from the list */
 543         spin_lock(&sur40->qlock);
 544         if (list_empty(&sur40->buf_list)) {
 545                 dev_dbg(sur40->dev, "buffer queue empty\n");
 546                 spin_unlock(&sur40->qlock);
 547                 return;
 548         }
 549         new_buf = list_entry(sur40->buf_list.next, struct sur40_buffer, list);
 550         list_del(&new_buf->list);
 551         spin_unlock(&sur40->qlock);
 552
 553         dev_dbg(sur40->dev, "buffer acquired\n");
 554
 555         /* retrieve data via bulk read */
 556         result = usb_bulk_msg(sur40->usbdev,
 557                         usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
 558                         sur40->bulk_in_buffer, sur40->bulk_in_size,
 559                         &bulk_read, 1000);
 560
 561         if (result < 0) {
 562                 dev_err(sur40->dev, "error in usb_bulk_read\n");
 563                 goto err_poll;
 564         }
 565
 566         if (bulk_read != sizeof(struct sur40_image_header)) {
 567                 dev_err(sur40->dev, "received %d bytes (%zd expected)\n",
 568                         bulk_read, sizeof(struct sur40_image_header));
 569                 goto err_poll;
 570         }
 571
 572         if (le32_to_cpu(img->magic) != VIDEO_HEADER_MAGIC) {
 573                 dev_err(sur40->dev, "image magic mismatch\n");
 574                 goto err_poll;
 575         }
 576
 577         if (le32_to_cpu(img->size) != sur40->pix_fmt.sizeimage) {
 578                 dev_err(sur40->dev, "image size mismatch\n");
 579                 goto err_poll;
 580         }
 581
 582         dev_dbg(sur40->dev, "header acquired\n");
 583
 584         sgt = vb2_dma_sg_plane_desc(&new_buf->vb.vb2_buf, 0);
 585
 586         result = usb_sg_init(&sgr, sur40->usbdev,
 587                 usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0,
 588                 sgt->sgl, sgt->nents, sur40->pix_fmt.sizeimage, 0);
 589         if (result < 0) {
 590                 dev_err(sur40->dev, "error %d in usb_sg_init\n", result);
 591                 goto err_poll;
 592         }
 593
 594         usb_sg_wait(&sgr);
 595         if (sgr.status < 0) {
 596                 dev_err(sur40->dev, "error %d in usb_sg_wait\n", sgr.status);
 597                 goto err_poll;
 598         }
 599
 600         dev_dbg(sur40->dev, "image acquired\n");
 601
 602         /* return error if streaming was stopped in the meantime */
 603         if (sur40->sequence == -1)
 604                 return;
 605
 606         /* mark as finished */
 607         new_buf->vb.vb2_buf.timestamp = ktime_get_ns();
 608         new_buf->vb.sequence = sur40->sequence++;
 609         new_buf->vb.field = V4L2_FIELD_NONE;
 610         vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 611         dev_dbg(sur40->dev, "buffer marked done\n");
 612         return;
 613
 614 err_poll:
 615         vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 616 }
 617
 618 /* Initialize input device parameters. */
 619 static int sur40_input_setup_events(struct input_dev *input_dev)
 620 {
 621         int error;
 622
 623         input_set_abs_params(input_dev, ABS_MT_POSITION_X,
 624                              0, SENSOR_RES_X, 0, 0);
 625         input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
 626                              0, SENSOR_RES_Y, 0, 0);
 627
 628         input_set_abs_params(input_dev, ABS_MT_TOOL_X,
 629                              0, SENSOR_RES_X, 0, 0);
 630         input_set_abs_params(input_dev, ABS_MT_TOOL_Y,
 631                              0, SENSOR_RES_Y, 0, 0);
 632
 633         /* max value unknown, but major/minor axis
 634          * can never be larger than screen */
 635         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
 636                              0, SENSOR_RES_X, 0, 0);
 637         input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR,
 638                              0, SENSOR_RES_Y, 0, 0);
 639
 640         input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
 641
 642         error = input_mt_init_slots(input_dev, MAX_CONTACTS,
 643                                     INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
 644         if (error) {
 645                 dev_err(input_dev->dev.parent, "failed to set up slots\n");
 646                 return error;
 647         }
 648
 649         return 0;
 650 }
 651
 652 /* Check candidate USB interface. */
 653 static int sur40_probe(struct usb_interface *interface,
 654                        const struct usb_device_id *id)
 655 {
 656         struct usb_device *usbdev = interface_to_usbdev(interface);
 657         struct sur40_state *sur40;
 658         struct usb_host_interface *iface_desc;
 659         struct usb_endpoint_descriptor *endpoint;
 660         struct input_dev *input;
 661         int error;
 662
 663         /* Check if we really have the right interface. */
 664         iface_desc = interface->cur_altsetting;
 665         if (iface_desc->desc.bInterfaceClass != 0xFF)
 666                 return -ENODEV;
 667
 668         if (iface_desc->desc.bNumEndpoints < 5)
 669                 return -ENODEV;
 670
 671         /* Use endpoint #4 (0x86). */
 672         endpoint = &iface_desc->endpoint[4].desc;
 673         if (endpoint->bEndpointAddress != TOUCH_ENDPOINT)
 674                 return -ENODEV;
 675
 676         /* Allocate memory for our device state and initialize it. */
 677         sur40 = kzalloc(sizeof(struct sur40_state), GFP_KERNEL);
 678         if (!sur40)
 679                 return -ENOMEM;
 680
 681         input = input_allocate_device();
 682         if (!input) {
 683                 error = -ENOMEM;
 684                 goto err_free_dev;
 685         }
 686
 687         /* initialize locks/lists */
 688         INIT_LIST_HEAD(&sur40->buf_list);
 689         spin_lock_init(&sur40->qlock);
 690         mutex_init(&sur40->lock);
 691
 692         /* Set up regular input device structure */
 693         input->name = DRIVER_LONG;
 694         usb_to_input_id(usbdev, &input->id);
 695         usb_make_path(usbdev, sur40->phys, sizeof(sur40->phys));
 696         strlcat(sur40->phys, "/input0", sizeof(sur40->phys));
 697         input->phys = sur40->phys;
 698         input->dev.parent = &interface->dev;
 699
 700         input->open = sur40_open;
 701         input->close = sur40_close;
 702
 703         error = sur40_input_setup_events(input);
 704         if (error)
 705                 goto err_free_input;
 706
 707         input_set_drvdata(input, sur40);
 708         error = input_setup_polling(input, sur40_poll);
 709         if (error) {
 710                 dev_err(&interface->dev, "failed to set up polling");
 711                 goto err_free_input;
 712         }
 713
 714         input_set_poll_interval(input, POLL_INTERVAL);
 715
 716         sur40->usbdev = usbdev;
 717         sur40->dev = &interface->dev;
 718         sur40->input = input;
 719
 720         /* use the bulk-in endpoint tested above */
 721         sur40->bulk_in_size = usb_endpoint_maxp(endpoint);
 722         sur40->bulk_in_epaddr = endpoint->bEndpointAddress;
 723         sur40->bulk_in_buffer = kmalloc(sur40->bulk_in_size, GFP_KERNEL);
 724         if (!sur40->bulk_in_buffer) {
 725                 dev_err(&interface->dev, "Unable to allocate input buffer.");
 726                 error = -ENOMEM;
 727                 goto err_free_input;
 728         }
 729
 730         /* register the polled input device */
 731         error = input_register_device(input);
 732         if (error) {
 733                 dev_err(&interface->dev,
 734                         "Unable to register polled input device.");
 735                 goto err_free_buffer;
 736         }
 737
 738         /* register the video master device */
 739         snprintf(sur40->v4l2.name, sizeof(sur40->v4l2.name), "%s", DRIVER_LONG);
 740         error = v4l2_device_register(sur40->dev, &sur40->v4l2);
 741         if (error) {
 742                 dev_err(&interface->dev,
 743                         "Unable to register video master device.");
 744                 goto err_unreg_v4l2;
 745         }
 746
 747         /* initialize the lock and subdevice */
 748         sur40->queue = sur40_queue;
 749         sur40->queue.drv_priv = sur40;
 750         sur40->queue.lock = &sur40->lock;
 751         sur40->queue.dev = sur40->dev;
 752
 753         /* initialize the queue */
 754         error = vb2_queue_init(&sur40->queue);
 755         if (error)
 756                 goto err_unreg_v4l2;
 757
 758         sur40->pix_fmt = sur40_pix_format[0];
 759         sur40->vdev = sur40_video_device;
 760         sur40->vdev.v4l2_dev = &sur40->v4l2;
 761         sur40->vdev.lock = &sur40->lock;
 762         sur40->vdev.queue = &sur40->queue;
 763         video_set_drvdata(&sur40->vdev, sur40);
 764
 765         /* initialize the control handler for 4 controls */
 766         v4l2_ctrl_handler_init(&sur40->hdl, 4);
 767         sur40->v4l2.ctrl_handler = &sur40->hdl;
 768         sur40->vsvideo = (SUR40_CONTRAST_DEF << 4) | SUR40_GAIN_DEF;
 769
 770         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_BRIGHTNESS,
 771           SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX, 1, clamp(brightness,
 772           (uint)SUR40_BRIGHTNESS_MIN, (uint)SUR40_BRIGHTNESS_MAX));
 773
 774         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_CONTRAST,
 775           SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX, 1, clamp(contrast,
 776           (uint)SUR40_CONTRAST_MIN, (uint)SUR40_CONTRAST_MAX));
 777
 778         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_GAIN,
 779           SUR40_GAIN_MIN, SUR40_GAIN_MAX, 1, clamp(gain,
 780           (uint)SUR40_GAIN_MIN, (uint)SUR40_GAIN_MAX));
 781
 782         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops,
 783           V4L2_CID_BACKLIGHT_COMPENSATION, SUR40_BACKLIGHT_MIN,
 784           SUR40_BACKLIGHT_MAX, 1, SUR40_BACKLIGHT_DEF);
 785
 786         v4l2_ctrl_handler_setup(&sur40->hdl);
 787
 788         if (sur40->hdl.error) {
 789                 dev_err(&interface->dev,
 790                         "Unable to register video controls.");
 791                 v4l2_ctrl_handler_free(&sur40->hdl);
 792                 goto err_unreg_v4l2;
 793         }
 794
 795         error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1);
 796         if (error) {
 797                 dev_err(&interface->dev,
 798                         "Unable to register video subdevice.");
 799                 goto err_unreg_video;
 800         }
 801
 802         /* we can register the device now, as it is ready */
 803         usb_set_intfdata(interface, sur40);
 804         dev_dbg(&interface->dev, "%s is now attached\n", DRIVER_DESC);
 805
 806         return 0;
 807
 808 err_unreg_video:
 809         video_unregister_device(&sur40->vdev);
 810 err_unreg_v4l2:
 811         v4l2_device_unregister(&sur40->v4l2);
 812 err_free_buffer:
 813         kfree(sur40->bulk_in_buffer);
 814 err_free_input:
 815         input_free_device(input);
 816 err_free_dev:
 817         kfree(sur40);
 818
 819         return error;
 820 }
 821
 822 /* Unregister device & clean up. */
 823 static void sur40_disconnect(struct usb_interface *interface)
 824 {
 825         struct sur40_state *sur40 = usb_get_intfdata(interface);
 826
 827         v4l2_ctrl_handler_free(&sur40->hdl);
 828         video_unregister_device(&sur40->vdev);
 829         v4l2_device_unregister(&sur40->v4l2);
 830
 831         input_unregister_device(sur40->input);
 832         kfree(sur40->bulk_in_buffer);
 833         kfree(sur40);
 834
 835         usb_set_intfdata(interface, NULL);
 836         dev_dbg(&interface->dev, "%s is now disconnected\n", DRIVER_DESC);
 837 }
 838
 839 /*
 840  * Setup the constraints of the queue: besides setting the number of planes
 841  * per buffer and the size and allocation context of each plane, it also
 842  * checks if sufficient buffers have been allocated. Usually 3 is a good
 843  * minimum number: many DMA engines need a minimum of 2 buffers in the
 844  * queue and you need to have another available for userspace processing.
 845  */
 846 static int sur40_queue_setup(struct vb2_queue *q,
 847                        unsigned int *nbuffers, unsigned int *nplanes,
 848                        unsigned int sizes[], struct device *alloc_devs[])
 849 {
 850         struct sur40_state *sur40 = vb2_get_drv_priv(q);
 851
 852         if (q->num_buffers + *nbuffers < 3)
 853                 *nbuffers = 3 - q->num_buffers;
 854
 855         if (*nplanes)
 856                 return sizes[0] < sur40->pix_fmt.sizeimage ? -EINVAL : 0;
 857
 858         *nplanes = 1;
 859         sizes[0] = sur40->pix_fmt.sizeimage;
 860
 861         return 0;
 862 }
 863
 864 /*
 865  * Prepare the buffer for queueing to the DMA engine: check and set the
 866  * payload size.
 867  */
 868 static int sur40_buffer_prepare(struct vb2_buffer *vb)
 869 {
 870         struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
 871         unsigned long size = sur40->pix_fmt.sizeimage;
 872
 873         if (vb2_plane_size(vb, 0) < size) {
 874                 dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n",
 875                          vb2_plane_size(vb, 0), size);
 876                 return -EINVAL;
 877         }
 878
 879         vb2_set_plane_payload(vb, 0, size);
 880         return 0;
 881 }
 882
 883 /*
 884  * Queue this buffer to the DMA engine.
 885  */
 886 static void sur40_buffer_queue(struct vb2_buffer *vb)
 887 {
 888         struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
 889         struct sur40_buffer *buf = (struct sur40_buffer *)vb;
 890
 891         spin_lock(&sur40->qlock);
 892         list_add_tail(&buf->list, &sur40->buf_list);
 893         spin_unlock(&sur40->qlock);
 894 }
 895
 896 static void return_all_buffers(struct sur40_state *sur40,
 897                                enum vb2_buffer_state state)
 898 {
 899         struct sur40_buffer *buf, *node;
 900
 901         spin_lock(&sur40->qlock);
 902         list_for_each_entry_safe(buf, node, &sur40->buf_list, list) {
 903                 vb2_buffer_done(&buf->vb.vb2_buf, state);
 904                 list_del(&buf->list);
 905         }
 906         spin_unlock(&sur40->qlock);
 907 }
 908
 909 /*
 910  * Start streaming. First check if the minimum number of buffers have been
 911  * queued. If not, then return -ENOBUFS and the vb2 framework will call
 912  * this function again the next time a buffer has been queued until enough
 913  * buffers are available to actually start the DMA engine.
 914  */
 915 static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count)
 916 {
 917         struct sur40_state *sur40 = vb2_get_drv_priv(vq);
 918
 919         sur40->sequence = 0;
 920         return 0;
 921 }
 922
 923 /*
 924  * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
 925  * and passed on to the vb2 framework marked as STATE_ERROR.
 926  */
 927 static void sur40_stop_streaming(struct vb2_queue *vq)
 928 {
 929         struct sur40_state *sur40 = vb2_get_drv_priv(vq);
 930         vb2_wait_for_all_buffers(vq);
 931         sur40->sequence = -1;
 932
 933         /* Release all active buffers */
 934         return_all_buffers(sur40, VB2_BUF_STATE_ERROR);
 935 }
 936
 937 /* V4L ioctl */
 938 static int sur40_vidioc_querycap(struct file *file, void *priv,
 939                                  struct v4l2_capability *cap)
 940 {
 941         struct sur40_state *sur40 = video_drvdata(file);
 942
 943         strlcpy(cap->driver, DRIVER_SHORT, sizeof(cap->driver));
 944         strlcpy(cap->card, DRIVER_LONG, sizeof(cap->card));
 945         usb_make_path(sur40->usbdev, cap->bus_info, sizeof(cap->bus_info));
 946         return 0;
 947 }
 948
 949 static int sur40_vidioc_enum_input(struct file *file, void *priv,
 950                                    struct v4l2_input *i)
 951 {
 952         if (i->index != 0)
 953                 return -EINVAL;
 954         i->type = V4L2_INPUT_TYPE_TOUCH;
 955         i->std = V4L2_STD_UNKNOWN;
 956         strlcpy(i->name, "In-Cell Sensor", sizeof(i->name));
 957         i->capabilities = 0;
 958         return 0;
 959 }
 960
 961 static int sur40_vidioc_s_input(struct file *file, void *priv, unsigned int i)
 962 {
 963         return (i == 0) ? 0 : -EINVAL;
 964 }
 965
 966 static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 967 {
 968         *i = 0;
 969         return 0;
 970 }
 971
 972 static int sur40_vidioc_try_fmt(struct file *file, void *priv,
 973                             struct v4l2_format *f)
 974 {
 975         switch (f->fmt.pix.pixelformat) {
 976         case V4L2_PIX_FMT_GREY:
 977                 f->fmt.pix = sur40_pix_format[1];
 978                 break;
 979
 980         default:
 981                 f->fmt.pix = sur40_pix_format[0];
 982                 break;
 983         }
 984
 985         return 0;
 986 }
 987
 988 static int sur40_vidioc_s_fmt(struct file *file, void *priv,
 989                             struct v4l2_format *f)
 990 {
 991         struct sur40_state *sur40 = video_drvdata(file);
 992
 993         switch (f->fmt.pix.pixelformat) {
 994         case V4L2_PIX_FMT_GREY:
 995                 sur40->pix_fmt = sur40_pix_format[1];
 996                 break;
 997
 998         default:
 999                 sur40->pix_fmt = sur40_pix_format[0];
1000                 break;
1001         }
1002
1003         f->fmt.pix = sur40->pix_fmt;
1004         return 0;
1005 }
1006
1007 static int sur40_vidioc_g_fmt(struct file *file, void *priv,
1008                             struct v4l2_format *f)
1009 {
1010         struct sur40_state *sur40 = video_drvdata(file);
1011
1012         f->fmt.pix = sur40->pix_fmt;
1013         return 0;
1014 }
1015
1016 static int sur40_s_ctrl(struct v4l2_ctrl *ctrl)
1017 {
1018         struct sur40_state *sur40  = container_of(ctrl->handler,
1019           struct sur40_state, hdl);
1020         u8 value = sur40->vsvideo;
1021
1022         switch (ctrl->id) {
1023         case V4L2_CID_BRIGHTNESS:
1024                 sur40_set_irlevel(sur40, ctrl->val);
1025                 break;
1026         case V4L2_CID_CONTRAST:
1027                 value = (value & 0x0f) | (ctrl->val << 4);
1028                 sur40_set_vsvideo(sur40, value);
1029                 break;
1030         case V4L2_CID_GAIN:
1031                 value = (value & 0xf0) | (ctrl->val);
1032                 sur40_set_vsvideo(sur40, value);
1033                 break;
1034         case V4L2_CID_BACKLIGHT_COMPENSATION:
1035                 sur40_set_preprocessor(sur40, ctrl->val);
1036                 break;
1037         }
1038         return 0;
1039 }
1040
1041 static int sur40_ioctl_parm(struct file *file, void *priv,
1042                             struct v4l2_streamparm *p)
1043 {
1044         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1045                 return -EINVAL;
1046
1047         p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1048         p->parm.capture.timeperframe.numerator = 1;
1049         p->parm.capture.timeperframe.denominator = 60;
1050         p->parm.capture.readbuffers = 3;
1051         return 0;
1052 }
1053
1054 static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
1055                                  struct v4l2_fmtdesc *f)
1056 {
1057         if (f->index >= ARRAY_SIZE(sur40_pix_format))
1058                 return -EINVAL;
1059
1060         f->pixelformat = sur40_pix_format[f->index].pixelformat;
1061         f->flags = 0;
1062         return 0;
1063 }
1064
1065 static int sur40_vidioc_enum_framesizes(struct file *file, void *priv,
1066                                         struct v4l2_frmsizeenum *f)
1067 {
1068         struct sur40_state *sur40 = video_drvdata(file);
1069
1070         if ((f->index != 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
1071                 && (f->pixel_format != V4L2_PIX_FMT_GREY)))
1072                 return -EINVAL;
1073
1074         f->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1075         f->discrete.width  = sur40->pix_fmt.width;
1076         f->discrete.height = sur40->pix_fmt.height;
1077         return 0;
1078 }
1079
1080 static int sur40_vidioc_enum_frameintervals(struct file *file, void *priv,
1081                                             struct v4l2_frmivalenum *f)
1082 {
1083         struct sur40_state *sur40 = video_drvdata(file);
1084
1085         if ((f->index > 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
1086                 && (f->pixel_format != V4L2_PIX_FMT_GREY))
1087                 || (f->width  != sur40->pix_fmt.width)
1088                 || (f->height != sur40->pix_fmt.height))
1089                 return -EINVAL;
1090
1091         f->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1092         f->discrete.denominator  = 60;
1093         f->discrete.numerator = 1;
1094         return 0;
1095 }
1096
1097
1098 static const struct usb_device_id sur40_table[] = {
1099         { USB_DEVICE(ID_MICROSOFT, ID_SUR40) },  /* Samsung SUR40 */
1100         { }                                      /* terminating null entry */
1101 };
1102 MODULE_DEVICE_TABLE(usb, sur40_table);
1103
1104 /* V4L2 structures */
1105 static const struct vb2_ops sur40_queue_ops = {
1106         .queue_setup            = sur40_queue_setup,
1107         .buf_prepare            = sur40_buffer_prepare,
1108         .buf_queue              = sur40_buffer_queue,
1109         .start_streaming        = sur40_start_streaming,
1110         .stop_streaming         = sur40_stop_streaming,
1111         .wait_prepare           = vb2_ops_wait_prepare,
1112         .wait_finish            = vb2_ops_wait_finish,
1113 };
1114
1115 static const struct vb2_queue sur40_queue = {
1116         .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1117         /*
1118          * VB2_USERPTR in currently not enabled: passing a user pointer to
1119          * dma-sg will result in segment sizes that are not a multiple of
1120          * 512 bytes, which is required by the host controller.
1121         */
1122         .io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF,
1123         .buf_struct_size = sizeof(struct sur40_buffer),
1124         .ops = &sur40_queue_ops,
1125         .mem_ops = &vb2_dma_sg_memops,
1126         .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
1127         .min_buffers_needed = 3,
1128 };
1129
1130 static const struct v4l2_file_operations sur40_video_fops = {
1131         .owner = THIS_MODULE,
1132         .open = v4l2_fh_open,
1133         .release = vb2_fop_release,
1134         .unlocked_ioctl = video_ioctl2,
1135         .read = vb2_fop_read,
1136         .mmap = vb2_fop_mmap,
1137         .poll = vb2_fop_poll,
1138 };
1139
1140 static const struct v4l2_ioctl_ops sur40_video_ioctl_ops = {
1141
1142         .vidioc_querycap        = sur40_vidioc_querycap,
1143
1144         .vidioc_enum_fmt_vid_cap = sur40_vidioc_enum_fmt,
1145         .vidioc_try_fmt_vid_cap = sur40_vidioc_try_fmt,
1146         .vidioc_s_fmt_vid_cap   = sur40_vidioc_s_fmt,
1147         .vidioc_g_fmt_vid_cap   = sur40_vidioc_g_fmt,
1148
1149         .vidioc_enum_framesizes = sur40_vidioc_enum_framesizes,
1150         .vidioc_enum_frameintervals = sur40_vidioc_enum_frameintervals,
1151
1152         .vidioc_g_parm = sur40_ioctl_parm,
1153         .vidioc_s_parm = sur40_ioctl_parm,
1154
1155         .vidioc_enum_input      = sur40_vidioc_enum_input,
1156         .vidioc_g_input         = sur40_vidioc_g_input,
1157         .vidioc_s_input         = sur40_vidioc_s_input,
1158
1159         .vidioc_reqbufs         = vb2_ioctl_reqbufs,
1160         .vidioc_create_bufs     = vb2_ioctl_create_bufs,
1161         .vidioc_querybuf        = vb2_ioctl_querybuf,
1162         .vidioc_qbuf            = vb2_ioctl_qbuf,
1163         .vidioc_dqbuf           = vb2_ioctl_dqbuf,
1164         .vidioc_expbuf          = vb2_ioctl_expbuf,
1165
1166         .vidioc_streamon        = vb2_ioctl_streamon,
1167         .vidioc_streamoff       = vb2_ioctl_streamoff,
1168 };
1169
1170 static const struct video_device sur40_video_device = {
1171         .name = DRIVER_LONG,
1172         .fops = &sur40_video_fops,
1173         .ioctl_ops = &sur40_video_ioctl_ops,
1174         .release = video_device_release_empty,
1175         .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
1176                        V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
1177 };
1178
1179 /* USB-specific object needed to register this driver with the USB subsystem. */
1180 static struct usb_driver sur40_driver = {
1181         .name = DRIVER_SHORT,
1182         .probe = sur40_probe,
1183         .disconnect = sur40_disconnect,
1184         .id_table = sur40_table,
1185 };
1186
1187 module_usb_driver(sur40_driver);
1188
1189 MODULE_AUTHOR(DRIVER_AUTHOR);
1190 MODULE_DESCRIPTION(DRIVER_DESC);
1191 MODULE_LICENSE("GPL");