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         struct sur40_header *header = &sur40->bulk_in_buffer->header;
 460         struct sur40_blob *inblob = &sur40->bulk_in_buffer->blobs[0];
 461
 462         dev_dbg(sur40->dev, "poll\n");
 463
 464         need_blobs = -1;
 465
 466         do {
 467
 468                 /* perform a blocking bulk read to get data from the device */
 469                 result = usb_bulk_msg(sur40->usbdev,
 470                         usb_rcvbulkpipe(sur40->usbdev, sur40->bulk_in_epaddr),
 471                         sur40->bulk_in_buffer, sur40->bulk_in_size,
 472                         &bulk_read, 1000);
 473
 474                 dev_dbg(sur40->dev, "received %d bytes\n", bulk_read);
 475
 476                 if (result < 0) {
 477                         dev_err(sur40->dev, "error in usb_bulk_read\n");
 478                         return;
 479                 }
 480
 481                 result = bulk_read - sizeof(struct sur40_header);
 482
 483                 if (result % sizeof(struct sur40_blob) != 0) {
 484                         dev_err(sur40->dev, "transfer size mismatch\n");
 485                         return;
 486                 }
 487
 488                 /* first packet? */
 489                 if (need_blobs == -1) {
 490                         need_blobs = le16_to_cpu(header->count);
 491                         dev_dbg(sur40->dev, "need %d blobs\n", need_blobs);
 492                         /* packet_id = le32_to_cpu(header->packet_id); */
 493                 }
 494
 495                 /*
 496                  * Sanity check. when video data is also being retrieved, the
 497                  * packet ID will usually increase in the middle of a series
 498                  * instead of at the end. However, the data is still consistent,
 499                  * so the packet ID is probably just valid for the first packet
 500                  * in a series.
 501
 502                 if (packet_id != le32_to_cpu(header->packet_id))
 503                         dev_dbg(sur40->dev, "packet ID mismatch\n");
 504                  */
 505
 506                 packet_blobs = result / sizeof(struct sur40_blob);
 507                 dev_dbg(sur40->dev, "received %d blobs\n", packet_blobs);
 508
 509                 /* packets always contain at least 4 blobs, even if empty */
 510                 if (packet_blobs > need_blobs)
 511                         packet_blobs = need_blobs;
 512
 513                 for (i = 0; i < packet_blobs; i++) {
 514                         need_blobs--;
 515                         dev_dbg(sur40->dev, "processing blob\n");
 516                         sur40_report_blob(&(inblob[i]), input);
 517                 }
 518
 519         } while (need_blobs > 0);
 520
 521         input_mt_sync_frame(input);
 522         input_sync(input);
 523
 524         sur40_process_video(sur40);
 525 }
 526
 527 /* deal with video data */
 528 static void sur40_process_video(struct sur40_state *sur40)
 529 {
 530
 531         struct sur40_image_header *img = (void *)(sur40->bulk_in_buffer);
 532         struct sur40_buffer *new_buf;
 533         struct usb_sg_request sgr;
 534         struct sg_table *sgt;
 535         int result, bulk_read;
 536
 537         if (!vb2_start_streaming_called(&sur40->queue))
 538                 return;
 539
 540         /* get a new buffer from the list */
 541         spin_lock(&sur40->qlock);
 542         if (list_empty(&sur40->buf_list)) {
 543                 dev_dbg(sur40->dev, "buffer queue empty\n");
 544                 spin_unlock(&sur40->qlock);
 545                 return;
 546         }
 547         new_buf = list_entry(sur40->buf_list.next, struct sur40_buffer, list);
 548         list_del(&new_buf->list);
 549         spin_unlock(&sur40->qlock);
 550
 551         dev_dbg(sur40->dev, "buffer acquired\n");
 552
 553         /* retrieve data via bulk read */
 554         result = usb_bulk_msg(sur40->usbdev,
 555                         usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
 556                         sur40->bulk_in_buffer, sur40->bulk_in_size,
 557                         &bulk_read, 1000);
 558
 559         if (result < 0) {
 560                 dev_err(sur40->dev, "error in usb_bulk_read\n");
 561                 goto err_poll;
 562         }
 563
 564         if (bulk_read != sizeof(struct sur40_image_header)) {
 565                 dev_err(sur40->dev, "received %d bytes (%zd expected)\n",
 566                         bulk_read, sizeof(struct sur40_image_header));
 567                 goto err_poll;
 568         }
 569
 570         if (le32_to_cpu(img->magic) != VIDEO_HEADER_MAGIC) {
 571                 dev_err(sur40->dev, "image magic mismatch\n");
 572                 goto err_poll;
 573         }
 574
 575         if (le32_to_cpu(img->size) != sur40->pix_fmt.sizeimage) {
 576                 dev_err(sur40->dev, "image size mismatch\n");
 577                 goto err_poll;
 578         }
 579
 580         dev_dbg(sur40->dev, "header acquired\n");
 581
 582         sgt = vb2_dma_sg_plane_desc(&new_buf->vb.vb2_buf, 0);
 583
 584         result = usb_sg_init(&sgr, sur40->usbdev,
 585                 usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0,
 586                 sgt->sgl, sgt->nents, sur40->pix_fmt.sizeimage, 0);
 587         if (result < 0) {
 588                 dev_err(sur40->dev, "error %d in usb_sg_init\n", result);
 589                 goto err_poll;
 590         }
 591
 592         usb_sg_wait(&sgr);
 593         if (sgr.status < 0) {
 594                 dev_err(sur40->dev, "error %d in usb_sg_wait\n", sgr.status);
 595                 goto err_poll;
 596         }
 597
 598         dev_dbg(sur40->dev, "image acquired\n");
 599
 600         /* return error if streaming was stopped in the meantime */
 601         if (sur40->sequence == -1)
 602                 return;
 603
 604         /* mark as finished */
 605         new_buf->vb.vb2_buf.timestamp = ktime_get_ns();
 606         new_buf->vb.sequence = sur40->sequence++;
 607         new_buf->vb.field = V4L2_FIELD_NONE;
 608         vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 609         dev_dbg(sur40->dev, "buffer marked done\n");
 610         return;
 611
 612 err_poll:
 613         vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 614 }
 615
 616 /* Initialize input device parameters. */
 617 static int sur40_input_setup_events(struct input_dev *input_dev)
 618 {
 619         int error;
 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         error = input_mt_init_slots(input_dev, MAX_CONTACTS,
 641                                     INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
 642         if (error) {
 643                 dev_err(input_dev->dev.parent, "failed to set up slots\n");
 644                 return error;
 645         }
 646
 647         return 0;
 648 }
 649
 650 /* Check candidate USB interface. */
 651 static int sur40_probe(struct usb_interface *interface,
 652                        const struct usb_device_id *id)
 653 {
 654         struct usb_device *usbdev = interface_to_usbdev(interface);
 655         struct sur40_state *sur40;
 656         struct usb_host_interface *iface_desc;
 657         struct usb_endpoint_descriptor *endpoint;
 658         struct input_dev *input;
 659         int error;
 660
 661         /* Check if we really have the right interface. */
 662         iface_desc = interface->cur_altsetting;
 663         if (iface_desc->desc.bInterfaceClass != 0xFF)
 664                 return -ENODEV;
 665
 666         if (iface_desc->desc.bNumEndpoints < 5)
 667                 return -ENODEV;
 668
 669         /* Use endpoint #4 (0x86). */
 670         endpoint = &iface_desc->endpoint[4].desc;
 671         if (endpoint->bEndpointAddress != TOUCH_ENDPOINT)
 672                 return -ENODEV;
 673
 674         /* Allocate memory for our device state and initialize it. */
 675         sur40 = kzalloc(sizeof(struct sur40_state), GFP_KERNEL);
 676         if (!sur40)
 677                 return -ENOMEM;
 678
 679         input = input_allocate_device();
 680         if (!input) {
 681                 error = -ENOMEM;
 682                 goto err_free_dev;
 683         }
 684
 685         /* initialize locks/lists */
 686         INIT_LIST_HEAD(&sur40->buf_list);
 687         spin_lock_init(&sur40->qlock);
 688         mutex_init(&sur40->lock);
 689
 690         /* Set up regular input device structure */
 691         input->name = DRIVER_LONG;
 692         usb_to_input_id(usbdev, &input->id);
 693         usb_make_path(usbdev, sur40->phys, sizeof(sur40->phys));
 694         strlcat(sur40->phys, "/input0", sizeof(sur40->phys));
 695         input->phys = sur40->phys;
 696         input->dev.parent = &interface->dev;
 697
 698         input->open = sur40_open;
 699         input->close = sur40_close;
 700
 701         error = sur40_input_setup_events(input);
 702         if (error)
 703                 goto err_free_input;
 704
 705         input_set_drvdata(input, sur40);
 706         error = input_setup_polling(input, sur40_poll);
 707         if (error) {
 708                 dev_err(&interface->dev, "failed to set up polling");
 709                 goto err_free_input;
 710         }
 711
 712         input_set_poll_interval(input, POLL_INTERVAL);
 713
 714         sur40->usbdev = usbdev;
 715         sur40->dev = &interface->dev;
 716         sur40->input = input;
 717
 718         /* use the bulk-in endpoint tested above */
 719         sur40->bulk_in_size = usb_endpoint_maxp(endpoint);
 720         sur40->bulk_in_epaddr = endpoint->bEndpointAddress;
 721         sur40->bulk_in_buffer = kmalloc(sur40->bulk_in_size, GFP_KERNEL);
 722         if (!sur40->bulk_in_buffer) {
 723                 dev_err(&interface->dev, "Unable to allocate input buffer.");
 724                 error = -ENOMEM;
 725                 goto err_free_input;
 726         }
 727
 728         /* register the polled input device */
 729         error = input_register_device(input);
 730         if (error) {
 731                 dev_err(&interface->dev,
 732                         "Unable to register polled input device.");
 733                 goto err_free_buffer;
 734         }
 735
 736         /* register the video master device */
 737         snprintf(sur40->v4l2.name, sizeof(sur40->v4l2.name), "%s", DRIVER_LONG);
 738         error = v4l2_device_register(sur40->dev, &sur40->v4l2);
 739         if (error) {
 740                 dev_err(&interface->dev,
 741                         "Unable to register video master device.");
 742                 goto err_unreg_v4l2;
 743         }
 744
 745         /* initialize the lock and subdevice */
 746         sur40->queue = sur40_queue;
 747         sur40->queue.drv_priv = sur40;
 748         sur40->queue.lock = &sur40->lock;
 749         sur40->queue.dev = sur40->dev;
 750
 751         /* initialize the queue */
 752         error = vb2_queue_init(&sur40->queue);
 753         if (error)
 754                 goto err_unreg_v4l2;
 755
 756         sur40->pix_fmt = sur40_pix_format[0];
 757         sur40->vdev = sur40_video_device;
 758         sur40->vdev.v4l2_dev = &sur40->v4l2;
 759         sur40->vdev.lock = &sur40->lock;
 760         sur40->vdev.queue = &sur40->queue;
 761         video_set_drvdata(&sur40->vdev, sur40);
 762
 763         /* initialize the control handler for 4 controls */
 764         v4l2_ctrl_handler_init(&sur40->hdl, 4);
 765         sur40->v4l2.ctrl_handler = &sur40->hdl;
 766         sur40->vsvideo = (SUR40_CONTRAST_DEF << 4) | SUR40_GAIN_DEF;
 767
 768         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_BRIGHTNESS,
 769           SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX, 1, clamp(brightness,
 770           (uint)SUR40_BRIGHTNESS_MIN, (uint)SUR40_BRIGHTNESS_MAX));
 771
 772         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_CONTRAST,
 773           SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX, 1, clamp(contrast,
 774           (uint)SUR40_CONTRAST_MIN, (uint)SUR40_CONTRAST_MAX));
 775
 776         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_GAIN,
 777           SUR40_GAIN_MIN, SUR40_GAIN_MAX, 1, clamp(gain,
 778           (uint)SUR40_GAIN_MIN, (uint)SUR40_GAIN_MAX));
 779
 780         v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops,
 781           V4L2_CID_BACKLIGHT_COMPENSATION, SUR40_BACKLIGHT_MIN,
 782           SUR40_BACKLIGHT_MAX, 1, SUR40_BACKLIGHT_DEF);
 783
 784         v4l2_ctrl_handler_setup(&sur40->hdl);
 785
 786         if (sur40->hdl.error) {
 787                 dev_err(&interface->dev,
 788                         "Unable to register video controls.");
 789                 v4l2_ctrl_handler_free(&sur40->hdl);
 790                 error = sur40->hdl.error;
 791                 goto err_unreg_v4l2;
 792         }
 793
 794         error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1);
 795         if (error) {
 796                 dev_err(&interface->dev,
 797                         "Unable to register video subdevice.");
 798                 goto err_unreg_video;
 799         }
 800
 801         /* we can register the device now, as it is ready */
 802         usb_set_intfdata(interface, sur40);
 803         dev_dbg(&interface->dev, "%s is now attached\n", DRIVER_DESC);
 804
 805         return 0;
 806
 807 err_unreg_video:
 808         video_unregister_device(&sur40->vdev);
 809 err_unreg_v4l2:
 810         v4l2_device_unregister(&sur40->v4l2);
 811 err_free_buffer:
 812         kfree(sur40->bulk_in_buffer);
 813 err_free_input:
 814         input_free_device(input);
 815 err_free_dev:
 816         kfree(sur40);
 817
 818         return error;
 819 }
 820
 821 /* Unregister device & clean up. */
 822 static void sur40_disconnect(struct usb_interface *interface)
 823 {
 824         struct sur40_state *sur40 = usb_get_intfdata(interface);
 825
 826         v4l2_ctrl_handler_free(&sur40->hdl);
 827         video_unregister_device(&sur40->vdev);
 828         v4l2_device_unregister(&sur40->v4l2);
 829
 830         input_unregister_device(sur40->input);
 831         kfree(sur40->bulk_in_buffer);
 832         kfree(sur40);
 833
 834         usb_set_intfdata(interface, NULL);
 835         dev_dbg(&interface->dev, "%s is now disconnected\n", DRIVER_DESC);
 836 }
 837
 838 /*
 839  * Setup the constraints of the queue: besides setting the number of planes
 840  * per buffer and the size and allocation context of each plane, it also
 841  * checks if sufficient buffers have been allocated. Usually 3 is a good
 842  * minimum number: many DMA engines need a minimum of 2 buffers in the
 843  * queue and you need to have another available for userspace processing.
 844  */
 845 static int sur40_queue_setup(struct vb2_queue *q,
 846                        unsigned int *nbuffers, unsigned int *nplanes,
 847                        unsigned int sizes[], struct device *alloc_devs[])
 848 {
 849         struct sur40_state *sur40 = vb2_get_drv_priv(q);
 850
 851         if (q->num_buffers + *nbuffers < 3)
 852                 *nbuffers = 3 - q->num_buffers;
 853
 854         if (*nplanes)
 855                 return sizes[0] < sur40->pix_fmt.sizeimage ? -EINVAL : 0;
 856
 857         *nplanes = 1;
 858         sizes[0] = sur40->pix_fmt.sizeimage;
 859
 860         return 0;
 861 }
 862
 863 /*
 864  * Prepare the buffer for queueing to the DMA engine: check and set the
 865  * payload size.
 866  */
 867 static int sur40_buffer_prepare(struct vb2_buffer *vb)
 868 {
 869         struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
 870         unsigned long size = sur40->pix_fmt.sizeimage;
 871
 872         if (vb2_plane_size(vb, 0) < size) {
 873                 dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n",
 874                          vb2_plane_size(vb, 0), size);
 875                 return -EINVAL;
 876         }
 877
 878         vb2_set_plane_payload(vb, 0, size);
 879         return 0;
 880 }
 881
 882 /*
 883  * Queue this buffer to the DMA engine.
 884  */
 885 static void sur40_buffer_queue(struct vb2_buffer *vb)
 886 {
 887         struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
 888         struct sur40_buffer *buf = (struct sur40_buffer *)vb;
 889
 890         spin_lock(&sur40->qlock);
 891         list_add_tail(&buf->list, &sur40->buf_list);
 892         spin_unlock(&sur40->qlock);
 893 }
 894
 895 static void return_all_buffers(struct sur40_state *sur40,
 896                                enum vb2_buffer_state state)
 897 {
 898         struct sur40_buffer *buf, *node;
 899
 900         spin_lock(&sur40->qlock);
 901         list_for_each_entry_safe(buf, node, &sur40->buf_list, list) {
 902                 vb2_buffer_done(&buf->vb.vb2_buf, state);
 903                 list_del(&buf->list);
 904         }
 905         spin_unlock(&sur40->qlock);
 906 }
 907
 908 /*
 909  * Start streaming. First check if the minimum number of buffers have been
 910  * queued. If not, then return -ENOBUFS and the vb2 framework will call
 911  * this function again the next time a buffer has been queued until enough
 912  * buffers are available to actually start the DMA engine.
 913  */
 914 static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count)
 915 {
 916         struct sur40_state *sur40 = vb2_get_drv_priv(vq);
 917
 918         sur40->sequence = 0;
 919         return 0;
 920 }
 921
 922 /*
 923  * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
 924  * and passed on to the vb2 framework marked as STATE_ERROR.
 925  */
 926 static void sur40_stop_streaming(struct vb2_queue *vq)
 927 {
 928         struct sur40_state *sur40 = vb2_get_drv_priv(vq);
 929         vb2_wait_for_all_buffers(vq);
 930         sur40->sequence = -1;
 931
 932         /* Release all active buffers */
 933         return_all_buffers(sur40, VB2_BUF_STATE_ERROR);
 934 }
 935
 936 /* V4L ioctl */
 937 static int sur40_vidioc_querycap(struct file *file, void *priv,
 938                                  struct v4l2_capability *cap)
 939 {
 940         struct sur40_state *sur40 = video_drvdata(file);
 941
 942         strlcpy(cap->driver, DRIVER_SHORT, sizeof(cap->driver));
 943         strlcpy(cap->card, DRIVER_LONG, sizeof(cap->card));
 944         usb_make_path(sur40->usbdev, cap->bus_info, sizeof(cap->bus_info));
 945         return 0;
 946 }
 947
 948 static int sur40_vidioc_enum_input(struct file *file, void *priv,
 949                                    struct v4l2_input *i)
 950 {
 951         if (i->index != 0)
 952                 return -EINVAL;
 953         i->type = V4L2_INPUT_TYPE_TOUCH;
 954         i->std = V4L2_STD_UNKNOWN;
 955         strlcpy(i->name, "In-Cell Sensor", sizeof(i->name));
 956         i->capabilities = 0;
 957         return 0;
 958 }
 959
 960 static int sur40_vidioc_s_input(struct file *file, void *priv, unsigned int i)
 961 {
 962         return (i == 0) ? 0 : -EINVAL;
 963 }
 964
 965 static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 966 {
 967         *i = 0;
 968         return 0;
 969 }
 970
 971 static int sur40_vidioc_try_fmt(struct file *file, void *priv,
 972                             struct v4l2_format *f)
 973 {
 974         switch (f->fmt.pix.pixelformat) {
 975         case V4L2_PIX_FMT_GREY:
 976                 f->fmt.pix = sur40_pix_format[1];
 977                 break;
 978
 979         default:
 980                 f->fmt.pix = sur40_pix_format[0];
 981                 break;
 982         }
 983
 984         return 0;
 985 }
 986
 987 static int sur40_vidioc_s_fmt(struct file *file, void *priv,
 988                             struct v4l2_format *f)
 989 {
 990         struct sur40_state *sur40 = video_drvdata(file);
 991
 992         switch (f->fmt.pix.pixelformat) {
 993         case V4L2_PIX_FMT_GREY:
 994                 sur40->pix_fmt = sur40_pix_format[1];
 995                 break;
 996
 997         default:
 998                 sur40->pix_fmt = sur40_pix_format[0];
 999                 break;
1000         }
1001
1002         f->fmt.pix = sur40->pix_fmt;
1003         return 0;
1004 }
1005
1006 static int sur40_vidioc_g_fmt(struct file *file, void *priv,
1007                             struct v4l2_format *f)
1008 {
1009         struct sur40_state *sur40 = video_drvdata(file);
1010
1011         f->fmt.pix = sur40->pix_fmt;
1012         return 0;
1013 }
1014
1015 static int sur40_s_ctrl(struct v4l2_ctrl *ctrl)
1016 {
1017         struct sur40_state *sur40  = container_of(ctrl->handler,
1018           struct sur40_state, hdl);
1019         u8 value = sur40->vsvideo;
1020
1021         switch (ctrl->id) {
1022         case V4L2_CID_BRIGHTNESS:
1023                 sur40_set_irlevel(sur40, ctrl->val);
1024                 break;
1025         case V4L2_CID_CONTRAST:
1026                 value = (value & 0x0f) | (ctrl->val << 4);
1027                 sur40_set_vsvideo(sur40, value);
1028                 break;
1029         case V4L2_CID_GAIN:
1030                 value = (value & 0xf0) | (ctrl->val);
1031                 sur40_set_vsvideo(sur40, value);
1032                 break;
1033         case V4L2_CID_BACKLIGHT_COMPENSATION:
1034                 sur40_set_preprocessor(sur40, ctrl->val);
1035                 break;
1036         }
1037         return 0;
1038 }
1039
1040 static int sur40_ioctl_parm(struct file *file, void *priv,
1041                             struct v4l2_streamparm *p)
1042 {
1043         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1044                 return -EINVAL;
1045
1046         p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1047         p->parm.capture.timeperframe.numerator = 1;
1048         p->parm.capture.timeperframe.denominator = 60;
1049         p->parm.capture.readbuffers = 3;
1050         return 0;
1051 }
1052
1053 static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
1054                                  struct v4l2_fmtdesc *f)
1055 {
1056         if (f->index >= ARRAY_SIZE(sur40_pix_format))
1057                 return -EINVAL;
1058
1059         f->pixelformat = sur40_pix_format[f->index].pixelformat;
1060         f->flags = 0;
1061         return 0;
1062 }
1063
1064 static int sur40_vidioc_enum_framesizes(struct file *file, void *priv,
1065                                         struct v4l2_frmsizeenum *f)
1066 {
1067         struct sur40_state *sur40 = video_drvdata(file);
1068
1069         if ((f->index != 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
1070                 && (f->pixel_format != V4L2_PIX_FMT_GREY)))
1071                 return -EINVAL;
1072
1073         f->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1074         f->discrete.width  = sur40->pix_fmt.width;
1075         f->discrete.height = sur40->pix_fmt.height;
1076         return 0;
1077 }
1078
1079 static int sur40_vidioc_enum_frameintervals(struct file *file, void *priv,
1080                                             struct v4l2_frmivalenum *f)
1081 {
1082         struct sur40_state *sur40 = video_drvdata(file);
1083
1084         if ((f->index > 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
1085                 && (f->pixel_format != V4L2_PIX_FMT_GREY))
1086                 || (f->width  != sur40->pix_fmt.width)
1087                 || (f->height != sur40->pix_fmt.height))
1088                 return -EINVAL;
1089
1090         f->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1091         f->discrete.denominator  = 60;
1092         f->discrete.numerator = 1;
1093         return 0;
1094 }
1095
1096
1097 static const struct usb_device_id sur40_table[] = {
1098         { USB_DEVICE(ID_MICROSOFT, ID_SUR40) },  /* Samsung SUR40 */
1099         { }                                      /* terminating null entry */
1100 };
1101 MODULE_DEVICE_TABLE(usb, sur40_table);
1102
1103 /* V4L2 structures */
1104 static const struct vb2_ops sur40_queue_ops = {
1105         .queue_setup            = sur40_queue_setup,
1106         .buf_prepare            = sur40_buffer_prepare,
1107         .buf_queue              = sur40_buffer_queue,
1108         .start_streaming        = sur40_start_streaming,
1109         .stop_streaming         = sur40_stop_streaming,
1110         .wait_prepare           = vb2_ops_wait_prepare,
1111         .wait_finish            = vb2_ops_wait_finish,
1112 };
1113
1114 static const struct vb2_queue sur40_queue = {
1115         .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1116         /*
1117          * VB2_USERPTR in currently not enabled: passing a user pointer to
1118          * dma-sg will result in segment sizes that are not a multiple of
1119          * 512 bytes, which is required by the host controller.
1120         */
1121         .io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF,
1122         .buf_struct_size = sizeof(struct sur40_buffer),
1123         .ops = &sur40_queue_ops,
1124         .mem_ops = &vb2_dma_sg_memops,
1125         .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
1126         .min_buffers_needed = 3,
1127 };
1128
1129 static const struct v4l2_file_operations sur40_video_fops = {
1130         .owner = THIS_MODULE,
1131         .open = v4l2_fh_open,
1132         .release = vb2_fop_release,
1133         .unlocked_ioctl = video_ioctl2,
1134         .read = vb2_fop_read,
1135         .mmap = vb2_fop_mmap,
1136         .poll = vb2_fop_poll,
1137 };
1138
1139 static const struct v4l2_ioctl_ops sur40_video_ioctl_ops = {
1140
1141         .vidioc_querycap        = sur40_vidioc_querycap,
1142
1143         .vidioc_enum_fmt_vid_cap = sur40_vidioc_enum_fmt,
1144         .vidioc_try_fmt_vid_cap = sur40_vidioc_try_fmt,
1145         .vidioc_s_fmt_vid_cap   = sur40_vidioc_s_fmt,
1146         .vidioc_g_fmt_vid_cap   = sur40_vidioc_g_fmt,
1147
1148         .vidioc_enum_framesizes = sur40_vidioc_enum_framesizes,
1149         .vidioc_enum_frameintervals = sur40_vidioc_enum_frameintervals,
1150
1151         .vidioc_g_parm = sur40_ioctl_parm,
1152         .vidioc_s_parm = sur40_ioctl_parm,
1153
1154         .vidioc_enum_input      = sur40_vidioc_enum_input,
1155         .vidioc_g_input         = sur40_vidioc_g_input,
1156         .vidioc_s_input         = sur40_vidioc_s_input,
1157
1158         .vidioc_reqbufs         = vb2_ioctl_reqbufs,
1159         .vidioc_create_bufs     = vb2_ioctl_create_bufs,
1160         .vidioc_querybuf        = vb2_ioctl_querybuf,
1161         .vidioc_qbuf            = vb2_ioctl_qbuf,
1162         .vidioc_dqbuf           = vb2_ioctl_dqbuf,
1163         .vidioc_expbuf          = vb2_ioctl_expbuf,
1164
1165         .vidioc_streamon        = vb2_ioctl_streamon,
1166         .vidioc_streamoff       = vb2_ioctl_streamoff,
1167 };
1168
1169 static const struct video_device sur40_video_device = {
1170         .name = DRIVER_LONG,
1171         .fops = &sur40_video_fops,
1172         .ioctl_ops = &sur40_video_ioctl_ops,
1173         .release = video_device_release_empty,
1174         .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
1175                        V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
1176 };
1177
1178 /* USB-specific object needed to register this driver with the USB subsystem. */
1179 static struct usb_driver sur40_driver = {
1180         .name = DRIVER_SHORT,
1181         .probe = sur40_probe,
1182         .disconnect = sur40_disconnect,
1183         .id_table = sur40_table,
1184 };
1185
1186 module_usb_driver(sur40_driver);
1187
1188 MODULE_AUTHOR(DRIVER_AUTHOR);
1189 MODULE_DESCRIPTION(DRIVER_DESC);
1190 MODULE_LICENSE("GPL");