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-polldev.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_SRGB,
 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_SRGB,
 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_polled_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
 374         /*
 375          * Discard the result buffer - no known data inside except
 376          * some version strings, maybe extract these sometime...
 377          */
 378 error:
 379         kfree(buffer);
 380         return result;
 381 }
 382
 383 /*
 384  * Callback routines from input_polled_dev
 385  */
 386
 387 /* Enable the device, polling will now start. */
 388 static void sur40_open(struct input_polled_dev *polldev)
 389 {
 390         struct sur40_state *sur40 = polldev->private;
 391
 392         dev_dbg(sur40->dev, "open\n");
 393         sur40_init(sur40);
 394 }
 395
 396 /* Disable device, polling has stopped. */
 397 static void sur40_close(struct input_polled_dev *polldev)
 398 {
 399         struct sur40_state *sur40 = polldev->private;
 400
 401         dev_dbg(sur40->dev, "close\n");
 402         /*
 403          * There is no known way to stop the device, so we simply
 404          * stop polling.
 405          */
 406 }
 407
 408 /*
 409  * This function is called when a whole contact has been processed,
 410  * so that it can assign it to a slot and store the data there.
 411  */
 412 static void sur40_report_blob(struct sur40_blob *blob, struct input_dev *input)
 413 {
 414         int wide, major, minor;
 415         int bb_size_x, bb_size_y, pos_x, pos_y, ctr_x, ctr_y, slotnum;
 416
 417         if (blob->type != SUR40_TOUCH)
 418                 return;
 419
 420         slotnum = input_mt_get_slot_by_key(input, blob->blob_id);
 421         if (slotnum < 0 || slotnum >= MAX_CONTACTS)
 422                 return;
 423
 424         bb_size_x = le16_to_cpu(blob->bb_size_x);
 425         bb_size_y = le16_to_cpu(blob->bb_size_y);
 426
 427         pos_x = le16_to_cpu(blob->pos_x);
 428         pos_y = le16_to_cpu(blob->pos_y);
 429
 430         ctr_x = le16_to_cpu(blob->ctr_x);
 431         ctr_y = le16_to_cpu(blob->ctr_y);
 432
 433         input_mt_slot(input, slotnum);
 434         input_mt_report_slot_state(input, MT_TOOL_FINGER, 1);
 435         wide = (bb_size_x > bb_size_y);
 436         major = max(bb_size_x, bb_size_y);
 437         minor = min(bb_size_x, bb_size_y);
 438
 439         input_report_abs(input, ABS_MT_POSITION_X, pos_x);
 440         input_report_abs(input, ABS_MT_POSITION_Y, pos_y);
 441         input_report_abs(input, ABS_MT_TOOL_X, ctr_x);
 442         input_report_abs(input, ABS_MT_TOOL_Y, ctr_y);
 443
 444         /* TODO: use a better orientation measure */
 445         input_report_abs(input, ABS_MT_ORIENTATION, wide);
 446         input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
 447         input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
 448 }
 449
 450 /* core function: poll for new input data */
 451 static void sur40_poll(struct input_polled_dev *polldev)
 452 {
 453         struct sur40_state *sur40 = polldev->private;
 454         struct input_dev *input = polldev->input;
 455         int result, bulk_read, need_blobs, packet_blobs, i;
 456         u32 uninitialized_var(packet_id);
 457
 458         struct sur40_header *header = &sur40->bulk_in_buffer->header;
 459         struct sur40_blob *inblob = &sur40->bulk_in_buffer->blobs[0];
 460
 461         dev_dbg(sur40->dev, "poll\n");
 462
 463         need_blobs = -1;
 464
 465         do {
 466
 467                 /* perform a blocking bulk read to get data from the device */
 468                 result = usb_bulk_msg(sur40->usbdev,
 469                         usb_rcvbulkpipe(sur40->usbdev, sur40->bulk_in_epaddr),
 470                         sur40->bulk_in_buffer, sur40->bulk_in_size,
 471                         &bulk_read, 1000);
 472
 473                 dev_dbg(sur40->dev, "received %d bytes\n", bulk_read);
 474
 475                 if (result < 0) {
 476                         dev_err(sur40->dev, "error in usb_bulk_read\n");
 477                         return;
 478                 }
 479
 480                 result = bulk_read - sizeof(struct sur40_header);
 481
 482                 if (result % sizeof(struct sur40_blob) != 0) {
 483                         dev_err(sur40->dev, "transfer size mismatch\n");
 484                         return;
 485                 }
 486
 487                 /* first packet? */
 488                 if (need_blobs == -1) {
 489                         need_blobs = le16_to_cpu(header->count);
 490                         dev_dbg(sur40->dev, "need %d blobs\n", need_blobs);
 491                         packet_id = le32_to_cpu(header->packet_id);
 492                 }
 493
 494                 /*
 495                  * Sanity check. when video data is also being retrieved, the
 496                  * packet ID will usually increase in the middle of a series
 497                  * instead of at the end. However, the data is still consistent,
 498                  * so the packet ID is probably just valid for the first packet
 499                  * in a series.
 500
 501                 if (packet_id != le32_to_cpu(header->packet_id))
 502                         dev_dbg(sur40->dev, "packet ID mismatch\n");
 503                  */
 504
 505                 packet_blobs = result / sizeof(struct sur40_blob);
 506                 dev_dbg(sur40->dev, "received %d blobs\n", packet_blobs);
 507
 508                 /* packets always contain at least 4 blobs, even if empty */
 509                 if (packet_blobs > need_blobs)
 510                         packet_blobs = need_blobs;
 511
 512                 for (i = 0; i < packet_blobs; i++) {
 513                         need_blobs--;
 514                         dev_dbg(sur40->dev, "processing blob\n");
 515                         sur40_report_blob(&(inblob[i]), input);
 516                 }
 517
 518         } while (need_blobs > 0);
 519
 520         input_mt_sync_frame(input);
 521         input_sync(input);
 522
 523         sur40_process_video(sur40);
 524 }
 525
 526 /* deal with video data */
 527 static void sur40_process_video(struct sur40_state *sur40)
 528 {
 529
 530         struct sur40_image_header *img = (void *)(sur40->bulk_in_buffer);
 531         struct sur40_buffer *new_buf;
 532         struct usb_sg_request sgr;
 533         struct sg_table *sgt;
 534         int result, bulk_read;
 535
 536         if (!vb2_start_streaming_called(&sur40->queue))
 537                 return;
 538
 539         /* get a new buffer from the list */
 540         spin_lock(&sur40->qlock);
 541         if (list_empty(&sur40->buf_list)) {
 542                 dev_dbg(sur40->dev, "buffer queue empty\n");
 543                 spin_unlock(&sur40->qlock);
 544                 return;
 545         }
 546         new_buf = list_entry(sur40->buf_list.next, struct sur40_buffer, list);
 547         list_del(&new_buf->list);
 548         spin_unlock(&sur40->qlock);
 549
 550         dev_dbg(sur40->dev, "buffer acquired\n");
 551
 552         /* retrieve data via bulk read */
 553         result = usb_bulk_msg(sur40->usbdev,
 554                         usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
 555                         sur40->bulk_in_buffer, sur40->bulk_in_size,
 556                         &bulk_read, 1000);
 557
 558         if (result < 0) {
 559                 dev_err(sur40->dev, "error in usb_bulk_read\n");
 560                 goto err_poll;
 561         }
 562
 563         if (bulk_read != sizeof(struct sur40_image_header)) {
 564                 dev_err(sur40->dev, "received %d bytes (%zd expected)\n",
 565                         bulk_read, sizeof(struct sur40_image_header));
 566                 goto err_poll;
 567         }
 568
 569         if (le32_to_cpu(img->magic) != VIDEO_HEADER_MAGIC) {
 570                 dev_err(sur40->dev, "image magic mismatch\n");
 571                 goto err_poll;
 572         }
 573
 574         if (le32_to_cpu(img->size) != sur40->pix_fmt.sizeimage) {
 575                 dev_err(sur40->dev, "image size mismatch\n");
 576                 goto err_poll;
 577         }
 578
 579         dev_dbg(sur40->dev, "header acquired\n");
 580
 581         sgt = vb2_dma_sg_plane_desc(&new_buf->vb.vb2_buf, 0);
 582
 583         result = usb_sg_init(&sgr, sur40->usbdev,
 584                 usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0,
 585                 sgt->sgl, sgt->nents, sur40->pix_fmt.sizeimage, 0);
 586         if (result < 0) {
 587                 dev_err(sur40->dev, "error %d in usb_sg_init\n", result);
 588                 goto err_poll;
 589         }
 590
 591         usb_sg_wait(&sgr);
 592         if (sgr.status < 0) {
 593                 dev_err(sur40->dev, "error %d in usb_sg_wait\n", sgr.status);
 594                 goto err_poll;
 595         }
 596
 597         dev_dbg(sur40->dev, "image acquired\n");
 598
 599         /* return error if streaming was stopped in the meantime */
 600         if (sur40->sequence == -1)
 601                 return;
 602
 603         /* mark as finished */
 604         new_buf->vb.vb2_buf.timestamp = ktime_get_ns();
 605         new_buf->vb.sequence = sur40->sequence++;
 606         new_buf->vb.field = V4L2_FIELD_NONE;
 607         vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 608         dev_dbg(sur40->dev, "buffer marked done\n");
 609         return;
 610
 611 err_poll:
 612         vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 613 }
 614
 615 /* Initialize input device parameters. */
 616 static void sur40_input_setup(struct input_dev *input_dev)
 617 {
 618         __set_bit(EV_KEY, input_dev->evbit);
 619         __set_bit(EV_ABS, input_dev->evbit);
 620
 621         input_set_abs_params(input_dev, ABS_MT_POSITION_X,
 622                              0, SENSOR_RES_X, 0, 0);
 623         input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
 624                              0, SENSOR_RES_Y, 0, 0);
 625
 626         input_set_abs_params(input_dev, ABS_MT_TOOL_X,
 627                              0, SENSOR_RES_X, 0, 0);
 628         input_set_abs_params(input_dev, ABS_MT_TOOL_Y,
 629                              0, SENSOR_RES_Y, 0, 0);
 630
 631         /* max value unknown, but major/minor axis
 632          * can never be larger than screen */
 633         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
 634                              0, SENSOR_RES_X, 0, 0);
 635         input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR,
 636                              0, SENSOR_RES_Y, 0, 0);
 637
 638         input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
 639
 640         input_mt_init_slots(input_dev, MAX_CONTACTS,
 641                             INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
 642 }
 643
 644 /* Check candidate USB interface. */
 645 static int sur40_probe(struct usb_interface *interface,
 646                        const struct usb_device_id *id)
 647 {
 648         struct usb_device *usbdev = interface_to_usbdev(interface);
 649         struct sur40_state *sur40;
 650         struct usb_host_interface *iface_desc;
 651         struct usb_endpoint_descriptor *endpoint;
 652         struct input_polled_dev *poll_dev;
 653         int error;
 654
 655         /* Check if we really have the right interface. */
 656         iface_desc = &interface->altsetting[0];
 657         if (iface_desc->desc.bInterfaceClass != 0xFF)
 658                 return -ENODEV;
 659
 660         if (iface_desc->desc.bNumEndpoints < 5)
 661                 return -ENODEV;
 662
 663         /* Use endpoint #4 (0x86). */
 664         endpoint = &iface_desc->endpoint[4].desc;
 665         if (endpoint->bEndpointAddress != TOUCH_ENDPOINT)
 666                 return -ENODEV;
 667
 668         /* Allocate memory for our device state and initialize it. */
 669         sur40 = kzalloc(sizeof(struct sur40_state), GFP_KERNEL);
 670         if (!sur40)
 671                 return -ENOMEM;
 672
 673         poll_dev = input_allocate_polled_device();
 674         if (!poll_dev) {
 675                 error = -ENOMEM;
 676                 goto err_free_dev;
 677         }
 678
 679         /* initialize locks/lists */
 680         INIT_LIST_HEAD(&sur40->buf_list);
 681         spin_lock_init(&sur40->qlock);
 682         mutex_init(&sur40->lock);
 683
 684         /* Set up polled input device control structure */
 685         poll_dev->private = sur40;
 686         poll_dev->poll_interval = POLL_INTERVAL;
 687         poll_dev->open = sur40_open;
 688         poll_dev->poll = sur40_poll;
 689         poll_dev->close = sur40_close;
 690
 691         /* Set up regular input device structure */
 692         sur40_input_setup(poll_dev->input);
 693
 694         poll_dev->input->name = DRIVER_LONG;
 695         usb_to_input_id(usbdev, &poll_dev->input->id);
 696         usb_make_path(usbdev, sur40->phys, sizeof(sur40->phys));
 697         strlcat(sur40->phys, "/input0", sizeof(sur40->phys));
 698         poll_dev->input->phys = sur40->phys;
 699         poll_dev->input->dev.parent = &interface->dev;
 700
 701         sur40->usbdev = usbdev;
 702         sur40->dev = &interface->dev;
 703         sur40->input = poll_dev;
 704
 705         /* use the bulk-in endpoint tested above */
 706         sur40->bulk_in_size = usb_endpoint_maxp(endpoint);
 707         sur40->bulk_in_epaddr = endpoint->bEndpointAddress;
 708         sur40->bulk_in_buffer = kmalloc(sur40->bulk_in_size, GFP_KERNEL);
 709         if (!sur40->bulk_in_buffer) {
 710                 dev_err(&interface->dev, "Unable to allocate input buffer.");
 711                 error = -ENOMEM;
 712                 goto err_free_polldev;
 713         }
 714
 715         /* register the polled input device */
 716         error = input_register_polled_device(poll_dev);
 717         if (error) {
 718                 dev_err(&interface->dev,
 719                         "Unable to register polled input device.");
 720                 goto err_free_buffer;
 721         }
 722
 723         /* register the video master device */
 724         snprintf(sur40->v4l2.name, sizeof(sur40->v4l2.name), "%s", DRIVER_LONG);
 725         error = v4l2_device_register(sur40->dev, &sur40->v4l2);
 726         if (error) {
 727                 dev_err(&interface->dev,
 728                         "Unable to register video master device.");
 729                 goto err_unreg_v4l2;
 730         }
 731
 732         /* initialize the lock and subdevice */
 733         sur40->queue = sur40_queue;
 734         sur40->queue.drv_priv = sur40;
 735         sur40->queue.lock = &sur40->lock;
 736         sur40->queue.dev = sur40->dev;
 737
 738         /* initialize the queue */
 739         error = vb2_queue_init(&sur40->queue);
 740         if (error)
 741                 goto err_unreg_v4l2;
 742
 743         sur40->pix_fmt = sur40_pix_format[0];
 744         sur40->vdev = sur40_video_device;
 745         sur40->vdev.v4l2_dev = &sur40->v4l2;
 746         sur40->vdev.lock = &sur40->lock;
 747         sur40->vdev.queue = &sur40->queue;
 748         video_set_drvdata(&sur40->vdev, sur40);
 749
 750         /* initialize the control handler for 4 controls */
 751         v4l2_ctrl_handler_init(&sur40->hdl, 4);
 752         sur40->v4l2.ctrl_handler = &sur40->hdl;
 753         sur40->vsvideo = (SUR40_CONTRAST_DEF << 4) | SUR40_GAIN_DEF;
 754
 755         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_BRIGHTNESS,
 756           SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX, 1, clamp(brightness,
 757           (uint)SUR40_BRIGHTNESS_MIN, (uint)SUR40_BRIGHTNESS_MAX));
 758
 759         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_CONTRAST,
 760           SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX, 1, clamp(contrast,
 761           (uint)SUR40_CONTRAST_MIN, (uint)SUR40_CONTRAST_MAX));
 762
 763         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_GAIN,
 764           SUR40_GAIN_MIN, SUR40_GAIN_MAX, 1, clamp(gain,
 765           (uint)SUR40_GAIN_MIN, (uint)SUR40_GAIN_MAX));
 766
 767         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops,
 768           V4L2_CID_BACKLIGHT_COMPENSATION, SUR40_BACKLIGHT_MIN,
 769           SUR40_BACKLIGHT_MAX, 1, SUR40_BACKLIGHT_DEF);
 770
 771         v4l2_ctrl_handler_setup(&sur40->hdl);
 772
 773         if (sur40->hdl.error) {
 774                 dev_err(&interface->dev,
 775                         "Unable to register video controls.");
 776                 v4l2_ctrl_handler_free(&sur40->hdl);
 777                 goto err_unreg_v4l2;
 778         }
 779
 780         error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1);
 781         if (error) {
 782                 dev_err(&interface->dev,
 783                         "Unable to register video subdevice.");
 784                 goto err_unreg_video;
 785         }
 786
 787         /* we can register the device now, as it is ready */
 788         usb_set_intfdata(interface, sur40);
 789         dev_dbg(&interface->dev, "%s is now attached\n", DRIVER_DESC);
 790
 791         return 0;
 792
 793 err_unreg_video:
 794         video_unregister_device(&sur40->vdev);
 795 err_unreg_v4l2:
 796         v4l2_device_unregister(&sur40->v4l2);
 797 err_free_buffer:
 798         kfree(sur40->bulk_in_buffer);
 799 err_free_polldev:
 800         input_free_polled_device(sur40->input);
 801 err_free_dev:
 802         kfree(sur40);
 803
 804         return error;
 805 }
 806
 807 /* Unregister device & clean up. */
 808 static void sur40_disconnect(struct usb_interface *interface)
 809 {
 810         struct sur40_state *sur40 = usb_get_intfdata(interface);
 811
 812         v4l2_ctrl_handler_free(&sur40->hdl);
 813         video_unregister_device(&sur40->vdev);
 814         v4l2_device_unregister(&sur40->v4l2);
 815
 816         input_unregister_polled_device(sur40->input);
 817         input_free_polled_device(sur40->input);
 818         kfree(sur40->bulk_in_buffer);
 819         kfree(sur40);
 820
 821         usb_set_intfdata(interface, NULL);
 822         dev_dbg(&interface->dev, "%s is now disconnected\n", DRIVER_DESC);
 823 }
 824
 825 /*
 826  * Setup the constraints of the queue: besides setting the number of planes
 827  * per buffer and the size and allocation context of each plane, it also
 828  * checks if sufficient buffers have been allocated. Usually 3 is a good
 829  * minimum number: many DMA engines need a minimum of 2 buffers in the
 830  * queue and you need to have another available for userspace processing.
 831  */
 832 static int sur40_queue_setup(struct vb2_queue *q,
 833                        unsigned int *nbuffers, unsigned int *nplanes,
 834                        unsigned int sizes[], struct device *alloc_devs[])
 835 {
 836         struct sur40_state *sur40 = vb2_get_drv_priv(q);
 837
 838         if (q->num_buffers + *nbuffers < 3)
 839                 *nbuffers = 3 - q->num_buffers;
 840
 841         if (*nplanes)
 842                 return sizes[0] < sur40->pix_fmt.sizeimage ? -EINVAL : 0;
 843
 844         *nplanes = 1;
 845         sizes[0] = sur40->pix_fmt.sizeimage;
 846
 847         return 0;
 848 }
 849
 850 /*
 851  * Prepare the buffer for queueing to the DMA engine: check and set the
 852  * payload size.
 853  */
 854 static int sur40_buffer_prepare(struct vb2_buffer *vb)
 855 {
 856         struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
 857         unsigned long size = sur40->pix_fmt.sizeimage;
 858
 859         if (vb2_plane_size(vb, 0) < size) {
 860                 dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n",
 861                          vb2_plane_size(vb, 0), size);
 862                 return -EINVAL;
 863         }
 864
 865         vb2_set_plane_payload(vb, 0, size);
 866         return 0;
 867 }
 868
 869 /*
 870  * Queue this buffer to the DMA engine.
 871  */
 872 static void sur40_buffer_queue(struct vb2_buffer *vb)
 873 {
 874         struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
 875         struct sur40_buffer *buf = (struct sur40_buffer *)vb;
 876
 877         spin_lock(&sur40->qlock);
 878         list_add_tail(&buf->list, &sur40->buf_list);
 879         spin_unlock(&sur40->qlock);
 880 }
 881
 882 static void return_all_buffers(struct sur40_state *sur40,
 883                                enum vb2_buffer_state state)
 884 {
 885         struct sur40_buffer *buf, *node;
 886
 887         spin_lock(&sur40->qlock);
 888         list_for_each_entry_safe(buf, node, &sur40->buf_list, list) {
 889                 vb2_buffer_done(&buf->vb.vb2_buf, state);
 890                 list_del(&buf->list);
 891         }
 892         spin_unlock(&sur40->qlock);
 893 }
 894
 895 /*
 896  * Start streaming. First check if the minimum number of buffers have been
 897  * queued. If not, then return -ENOBUFS and the vb2 framework will call
 898  * this function again the next time a buffer has been queued until enough
 899  * buffers are available to actually start the DMA engine.
 900  */
 901 static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count)
 902 {
 903         struct sur40_state *sur40 = vb2_get_drv_priv(vq);
 904
 905         sur40->sequence = 0;
 906         return 0;
 907 }
 908
 909 /*
 910  * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
 911  * and passed on to the vb2 framework marked as STATE_ERROR.
 912  */
 913 static void sur40_stop_streaming(struct vb2_queue *vq)
 914 {
 915         struct sur40_state *sur40 = vb2_get_drv_priv(vq);
 916         vb2_wait_for_all_buffers(vq);
 917         sur40->sequence = -1;
 918
 919         /* Release all active buffers */
 920         return_all_buffers(sur40, VB2_BUF_STATE_ERROR);
 921 }
 922
 923 /* V4L ioctl */
 924 static int sur40_vidioc_querycap(struct file *file, void *priv,
 925                                  struct v4l2_capability *cap)
 926 {
 927         struct sur40_state *sur40 = video_drvdata(file);
 928
 929         strlcpy(cap->driver, DRIVER_SHORT, sizeof(cap->driver));
 930         strlcpy(cap->card, DRIVER_LONG, sizeof(cap->card));
 931         usb_make_path(sur40->usbdev, cap->bus_info, sizeof(cap->bus_info));
 932         return 0;
 933 }
 934
 935 static int sur40_vidioc_enum_input(struct file *file, void *priv,
 936                                    struct v4l2_input *i)
 937 {
 938         if (i->index != 0)
 939                 return -EINVAL;
 940         i->type = V4L2_INPUT_TYPE_TOUCH;
 941         i->std = V4L2_STD_UNKNOWN;
 942         strlcpy(i->name, "In-Cell Sensor", sizeof(i->name));
 943         i->capabilities = 0;
 944         return 0;
 945 }
 946
 947 static int sur40_vidioc_s_input(struct file *file, void *priv, unsigned int i)
 948 {
 949         return (i == 0) ? 0 : -EINVAL;
 950 }
 951
 952 static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 953 {
 954         *i = 0;
 955         return 0;
 956 }
 957
 958 static int sur40_vidioc_try_fmt(struct file *file, void *priv,
 959                             struct v4l2_format *f)
 960 {
 961         switch (f->fmt.pix.pixelformat) {
 962         case V4L2_PIX_FMT_GREY:
 963                 f->fmt.pix = sur40_pix_format[1];
 964                 break;
 965
 966         default:
 967                 f->fmt.pix = sur40_pix_format[0];
 968                 break;
 969         }
 970
 971         return 0;
 972 }
 973
 974 static int sur40_vidioc_s_fmt(struct file *file, void *priv,
 975                             struct v4l2_format *f)
 976 {
 977         struct sur40_state *sur40 = video_drvdata(file);
 978
 979         switch (f->fmt.pix.pixelformat) {
 980         case V4L2_PIX_FMT_GREY:
 981                 sur40->pix_fmt = sur40_pix_format[1];
 982                 break;
 983
 984         default:
 985                 sur40->pix_fmt = sur40_pix_format[0];
 986                 break;
 987         }
 988
 989         f->fmt.pix = sur40->pix_fmt;
 990         return 0;
 991 }
 992
 993 static int sur40_vidioc_g_fmt(struct file *file, void *priv,
 994                             struct v4l2_format *f)
 995 {
 996         struct sur40_state *sur40 = video_drvdata(file);
 997
 998         f->fmt.pix = sur40->pix_fmt;
 999         return 0;
1000 }
1001
1002 static int sur40_s_ctrl(struct v4l2_ctrl *ctrl)
1003 {
1004         struct sur40_state *sur40  = container_of(ctrl->handler,
1005           struct sur40_state, hdl);
1006         u8 value = sur40->vsvideo;
1007
1008         switch (ctrl->id) {
1009         case V4L2_CID_BRIGHTNESS:
1010                 sur40_set_irlevel(sur40, ctrl->val);
1011                 break;
1012         case V4L2_CID_CONTRAST:
1013                 value = (value & 0x0f) | (ctrl->val << 4);
1014                 sur40_set_vsvideo(sur40, value);
1015                 break;
1016         case V4L2_CID_GAIN:
1017                 value = (value & 0xf0) | (ctrl->val);
1018                 sur40_set_vsvideo(sur40, value);
1019                 break;
1020         case V4L2_CID_BACKLIGHT_COMPENSATION:
1021                 sur40_set_preprocessor(sur40, ctrl->val);
1022                 break;
1023         }
1024         return 0;
1025 }
1026
1027 static int sur40_ioctl_parm(struct file *file, void *priv,
1028                             struct v4l2_streamparm *p)
1029 {
1030         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1031                 return -EINVAL;
1032
1033         p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1034         p->parm.capture.timeperframe.numerator = 1;
1035         p->parm.capture.timeperframe.denominator = 60;
1036         p->parm.capture.readbuffers = 3;
1037         return 0;
1038 }
1039
1040 static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
1041                                  struct v4l2_fmtdesc *f)
1042 {
1043         if (f->index >= ARRAY_SIZE(sur40_pix_format))
1044                 return -EINVAL;
1045
1046         f->pixelformat = sur40_pix_format[f->index].pixelformat;
1047         f->flags = 0;
1048         return 0;
1049 }
1050
1051 static int sur40_vidioc_enum_framesizes(struct file *file, void *priv,
1052                                         struct v4l2_frmsizeenum *f)
1053 {
1054         struct sur40_state *sur40 = video_drvdata(file);
1055
1056         if ((f->index != 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
1057                 && (f->pixel_format != V4L2_PIX_FMT_GREY)))
1058                 return -EINVAL;
1059
1060         f->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1061         f->discrete.width  = sur40->pix_fmt.width;
1062         f->discrete.height = sur40->pix_fmt.height;
1063         return 0;
1064 }
1065
1066 static int sur40_vidioc_enum_frameintervals(struct file *file, void *priv,
1067                                             struct v4l2_frmivalenum *f)
1068 {
1069         struct sur40_state *sur40 = video_drvdata(file);
1070
1071         if ((f->index > 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
1072                 && (f->pixel_format != V4L2_PIX_FMT_GREY))
1073                 || (f->width  != sur40->pix_fmt.width)
1074                 || (f->height != sur40->pix_fmt.height))
1075                 return -EINVAL;
1076
1077         f->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1078         f->discrete.denominator  = 60;
1079         f->discrete.numerator = 1;
1080         return 0;
1081 }
1082
1083
1084 static const struct usb_device_id sur40_table[] = {
1085         { USB_DEVICE(ID_MICROSOFT, ID_SUR40) },  /* Samsung SUR40 */
1086         { }                                      /* terminating null entry */
1087 };
1088 MODULE_DEVICE_TABLE(usb, sur40_table);
1089
1090 /* V4L2 structures */
1091 static const struct vb2_ops sur40_queue_ops = {
1092         .queue_setup            = sur40_queue_setup,
1093         .buf_prepare            = sur40_buffer_prepare,
1094         .buf_queue              = sur40_buffer_queue,
1095         .start_streaming        = sur40_start_streaming,
1096         .stop_streaming         = sur40_stop_streaming,
1097         .wait_prepare           = vb2_ops_wait_prepare,
1098         .wait_finish            = vb2_ops_wait_finish,
1099 };
1100
1101 static const struct vb2_queue sur40_queue = {
1102         .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1103         /*
1104          * VB2_USERPTR in currently not enabled: passing a user pointer to
1105          * dma-sg will result in segment sizes that are not a multiple of
1106          * 512 bytes, which is required by the host controller.
1107         */
1108         .io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF,
1109         .buf_struct_size = sizeof(struct sur40_buffer),
1110         .ops = &sur40_queue_ops,
1111         .mem_ops = &vb2_dma_sg_memops,
1112         .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
1113         .min_buffers_needed = 3,
1114 };
1115
1116 static const struct v4l2_file_operations sur40_video_fops = {
1117         .owner = THIS_MODULE,
1118         .open = v4l2_fh_open,
1119         .release = vb2_fop_release,
1120         .unlocked_ioctl = video_ioctl2,
1121         .read = vb2_fop_read,
1122         .mmap = vb2_fop_mmap,
1123         .poll = vb2_fop_poll,
1124 };
1125
1126 static const struct v4l2_ioctl_ops sur40_video_ioctl_ops = {
1127
1128         .vidioc_querycap        = sur40_vidioc_querycap,
1129
1130         .vidioc_enum_fmt_vid_cap = sur40_vidioc_enum_fmt,
1131         .vidioc_try_fmt_vid_cap = sur40_vidioc_try_fmt,
1132         .vidioc_s_fmt_vid_cap   = sur40_vidioc_s_fmt,
1133         .vidioc_g_fmt_vid_cap   = sur40_vidioc_g_fmt,
1134
1135         .vidioc_enum_framesizes = sur40_vidioc_enum_framesizes,
1136         .vidioc_enum_frameintervals = sur40_vidioc_enum_frameintervals,
1137
1138         .vidioc_g_parm = sur40_ioctl_parm,
1139         .vidioc_s_parm = sur40_ioctl_parm,
1140
1141         .vidioc_enum_input      = sur40_vidioc_enum_input,
1142         .vidioc_g_input         = sur40_vidioc_g_input,
1143         .vidioc_s_input         = sur40_vidioc_s_input,
1144
1145         .vidioc_reqbufs         = vb2_ioctl_reqbufs,
1146         .vidioc_create_bufs     = vb2_ioctl_create_bufs,
1147         .vidioc_querybuf        = vb2_ioctl_querybuf,
1148         .vidioc_qbuf            = vb2_ioctl_qbuf,
1149         .vidioc_dqbuf           = vb2_ioctl_dqbuf,
1150         .vidioc_expbuf          = vb2_ioctl_expbuf,
1151
1152         .vidioc_streamon        = vb2_ioctl_streamon,
1153         .vidioc_streamoff       = vb2_ioctl_streamoff,
1154 };
1155
1156 static const struct video_device sur40_video_device = {
1157         .name = DRIVER_LONG,
1158         .fops = &sur40_video_fops,
1159         .ioctl_ops = &sur40_video_ioctl_ops,
1160         .release = video_device_release_empty,
1161         .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
1162                        V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
1163 };
1164
1165 /* USB-specific object needed to register this driver with the USB subsystem. */
1166 static struct usb_driver sur40_driver = {
1167         .name = DRIVER_SHORT,
1168         .probe = sur40_probe,
1169         .disconnect = sur40_disconnect,
1170         .id_table = sur40_table,
1171 };
1172
1173 module_usb_driver(sur40_driver);
1174
1175 MODULE_AUTHOR(DRIVER_AUTHOR);
1176 MODULE_DESCRIPTION(DRIVER_DESC);
1177 MODULE_LICENSE("GPL");