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"); 1178