1 /* 2 * Surface2.0/SUR40/PixelSense input driver 3 * 4 * Copyright (c) 2014 by Florian 'floe' Echtler <floe@butterbrot.org> 5 * 6 * Derived from the USB Skeleton driver 1.1, 7 * Copyright (c) 2003 Greg Kroah-Hartman (greg@kroah.com) 8 * 9 * and from the Apple USB BCM5974 multitouch driver, 10 * Copyright (c) 2008 Henrik Rydberg (rydberg@euromail.se) 11 * 12 * and from the generic hid-multitouch driver, 13 * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr> 14 * 15 * and from the v4l2-pci-skeleton driver, 16 * Copyright (c) Copyright 2014 Cisco Systems, Inc. 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License as 20 * published by the Free Software Foundation; either version 2 of 21 * the License, or (at your option) any later version. 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/errno.h> 26 #include <linux/delay.h> 27 #include <linux/init.h> 28 #include <linux/slab.h> 29 #include <linux/module.h> 30 #include <linux/completion.h> 31 #include <linux/uaccess.h> 32 #include <linux/usb.h> 33 #include <linux/printk.h> 34 #include <linux/input-polldev.h> 35 #include <linux/input/mt.h> 36 #include <linux/usb/input.h> 37 #include <linux/videodev2.h> 38 #include <media/v4l2-device.h> 39 #include <media/v4l2-dev.h> 40 #include <media/v4l2-ioctl.h> 41 #include <media/videobuf2-v4l2.h> 42 #include <media/videobuf2-dma-sg.h> 43 44 /* read 512 bytes from endpoint 0x86 -> get header + blobs */ 45 struct sur40_header { 46 47 __le16 type; /* always 0x0001 */ 48 __le16 count; /* count of blobs (if 0: continue prev. packet) */ 49 50 __le32 packet_id; /* unique ID for all packets in one frame */ 51 52 __le32 timestamp; /* milliseconds (inc. by 16 or 17 each frame) */ 53 __le32 unknown; /* "epoch?" always 02/03 00 00 00 */ 54 55 } __packed; 56 57 struct sur40_blob { 58 59 __le16 blob_id; 60 61 u8 action; /* 0x02 = enter/exit, 0x03 = update (?) */ 62 u8 unknown; /* always 0x01 or 0x02 (no idea what this is?) */ 63 64 __le16 bb_pos_x; /* upper left corner of bounding box */ 65 __le16 bb_pos_y; 66 67 __le16 bb_size_x; /* size of bounding box */ 68 __le16 bb_size_y; 69 70 __le16 pos_x; /* finger tip position */ 71 __le16 pos_y; 72 73 __le16 ctr_x; /* centroid position */ 74 __le16 ctr_y; 75 76 __le16 axis_x; /* somehow related to major/minor axis, mostly: */ 77 __le16 axis_y; /* axis_x == bb_size_y && axis_y == bb_size_x */ 78 79 __le32 angle; /* orientation in radians relative to x axis - 80 actually an IEEE754 float, don't use in kernel */ 81 82 __le32 area; /* size in pixels/pressure (?) */ 83 84 u8 padding[32]; 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_UNKNOWN1 0xb3 /* 5 bytes */ 137 #define SUR40_UNKNOWN2 0xc1 /* 24 bytes */ 138 139 #define SUR40_GET_STATE 0xc5 /* 4 bytes state (?) */ 140 #define SUR40_GET_SENSORS 0xb1 /* 8 bytes sensors */ 141 142 static const struct v4l2_pix_format sur40_pix_format[] = { 143 { 144 .pixelformat = V4L2_TCH_FMT_TU08, 145 .width = SENSOR_RES_X / 2, 146 .height = SENSOR_RES_Y / 2, 147 .field = V4L2_FIELD_NONE, 148 .colorspace = V4L2_COLORSPACE_SRGB, 149 .bytesperline = SENSOR_RES_X / 2, 150 .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2), 151 }, 152 { 153 .pixelformat = V4L2_PIX_FMT_GREY, 154 .width = SENSOR_RES_X / 2, 155 .height = SENSOR_RES_Y / 2, 156 .field = V4L2_FIELD_NONE, 157 .colorspace = V4L2_COLORSPACE_SRGB, 158 .bytesperline = SENSOR_RES_X / 2, 159 .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2), 160 } 161 }; 162 163 /* master device state */ 164 struct sur40_state { 165 166 struct usb_device *usbdev; 167 struct device *dev; 168 struct input_polled_dev *input; 169 170 struct v4l2_device v4l2; 171 struct video_device vdev; 172 struct mutex lock; 173 struct v4l2_pix_format pix_fmt; 174 175 struct vb2_queue queue; 176 struct list_head buf_list; 177 spinlock_t qlock; 178 int sequence; 179 180 struct sur40_data *bulk_in_buffer; 181 size_t bulk_in_size; 182 u8 bulk_in_epaddr; 183 184 char phys[64]; 185 }; 186 187 struct sur40_buffer { 188 struct vb2_v4l2_buffer vb; 189 struct list_head list; 190 }; 191 192 /* forward declarations */ 193 static const struct video_device sur40_video_device; 194 static const struct vb2_queue sur40_queue; 195 static void sur40_process_video(struct sur40_state *sur40); 196 197 /* 198 * Note: an earlier, non-public version of this driver used USB_RECIP_ENDPOINT 199 * here by mistake which is very likely to have corrupted the firmware EEPROM 200 * on two separate SUR40 devices. Thanks to Alan Stern who spotted this bug. 201 * Should you ever run into a similar problem, the background story to this 202 * incident and instructions on how to fix the corrupted EEPROM are available 203 * at https://floe.butterbrot.org/matrix/hacking/surface/brick.html 204 */ 205 206 /* command wrapper */ 207 static int sur40_command(struct sur40_state *dev, 208 u8 command, u16 index, void *buffer, u16 size) 209 { 210 return usb_control_msg(dev->usbdev, usb_rcvctrlpipe(dev->usbdev, 0), 211 command, 212 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, 213 0x00, index, buffer, size, 1000); 214 } 215 216 /* Initialization routine, called from sur40_open */ 217 static int sur40_init(struct sur40_state *dev) 218 { 219 int result; 220 u8 *buffer; 221 222 buffer = kmalloc(24, GFP_KERNEL); 223 if (!buffer) { 224 result = -ENOMEM; 225 goto error; 226 } 227 228 /* stupidly replay the original MS driver init sequence */ 229 result = sur40_command(dev, SUR40_GET_VERSION, 0x00, buffer, 12); 230 if (result < 0) 231 goto error; 232 233 result = sur40_command(dev, SUR40_GET_VERSION, 0x01, buffer, 12); 234 if (result < 0) 235 goto error; 236 237 result = sur40_command(dev, SUR40_GET_VERSION, 0x02, buffer, 12); 238 if (result < 0) 239 goto error; 240 241 result = sur40_command(dev, SUR40_UNKNOWN2, 0x00, buffer, 24); 242 if (result < 0) 243 goto error; 244 245 result = sur40_command(dev, SUR40_UNKNOWN1, 0x00, buffer, 5); 246 if (result < 0) 247 goto error; 248 249 result = sur40_command(dev, SUR40_GET_VERSION, 0x03, buffer, 12); 250 251 /* 252 * Discard the result buffer - no known data inside except 253 * some version strings, maybe extract these sometime... 254 */ 255 error: 256 kfree(buffer); 257 return result; 258 } 259 260 /* 261 * Callback routines from input_polled_dev 262 */ 263 264 /* Enable the device, polling will now start. */ 265 static void sur40_open(struct input_polled_dev *polldev) 266 { 267 struct sur40_state *sur40 = polldev->private; 268 269 dev_dbg(sur40->dev, "open\n"); 270 sur40_init(sur40); 271 } 272 273 /* Disable device, polling has stopped. */ 274 static void sur40_close(struct input_polled_dev *polldev) 275 { 276 struct sur40_state *sur40 = polldev->private; 277 278 dev_dbg(sur40->dev, "close\n"); 279 /* 280 * There is no known way to stop the device, so we simply 281 * stop polling. 282 */ 283 } 284 285 /* 286 * This function is called when a whole contact has been processed, 287 * so that it can assign it to a slot and store the data there. 288 */ 289 static void sur40_report_blob(struct sur40_blob *blob, struct input_dev *input) 290 { 291 int wide, major, minor; 292 293 int bb_size_x = le16_to_cpu(blob->bb_size_x); 294 int bb_size_y = le16_to_cpu(blob->bb_size_y); 295 296 int pos_x = le16_to_cpu(blob->pos_x); 297 int pos_y = le16_to_cpu(blob->pos_y); 298 299 int ctr_x = le16_to_cpu(blob->ctr_x); 300 int ctr_y = le16_to_cpu(blob->ctr_y); 301 302 int slotnum = input_mt_get_slot_by_key(input, blob->blob_id); 303 if (slotnum < 0 || slotnum >= MAX_CONTACTS) 304 return; 305 306 input_mt_slot(input, slotnum); 307 input_mt_report_slot_state(input, MT_TOOL_FINGER, 1); 308 wide = (bb_size_x > bb_size_y); 309 major = max(bb_size_x, bb_size_y); 310 minor = min(bb_size_x, bb_size_y); 311 312 input_report_abs(input, ABS_MT_POSITION_X, pos_x); 313 input_report_abs(input, ABS_MT_POSITION_Y, pos_y); 314 input_report_abs(input, ABS_MT_TOOL_X, ctr_x); 315 input_report_abs(input, ABS_MT_TOOL_Y, ctr_y); 316 317 /* TODO: use a better orientation measure */ 318 input_report_abs(input, ABS_MT_ORIENTATION, wide); 319 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major); 320 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor); 321 } 322 323 /* core function: poll for new input data */ 324 static void sur40_poll(struct input_polled_dev *polldev) 325 { 326 struct sur40_state *sur40 = polldev->private; 327 struct input_dev *input = polldev->input; 328 int result, bulk_read, need_blobs, packet_blobs, i; 329 u32 uninitialized_var(packet_id); 330 331 struct sur40_header *header = &sur40->bulk_in_buffer->header; 332 struct sur40_blob *inblob = &sur40->bulk_in_buffer->blobs[0]; 333 334 dev_dbg(sur40->dev, "poll\n"); 335 336 need_blobs = -1; 337 338 do { 339 340 /* perform a blocking bulk read to get data from the device */ 341 result = usb_bulk_msg(sur40->usbdev, 342 usb_rcvbulkpipe(sur40->usbdev, sur40->bulk_in_epaddr), 343 sur40->bulk_in_buffer, sur40->bulk_in_size, 344 &bulk_read, 1000); 345 346 dev_dbg(sur40->dev, "received %d bytes\n", bulk_read); 347 348 if (result < 0) { 349 dev_err(sur40->dev, "error in usb_bulk_read\n"); 350 return; 351 } 352 353 result = bulk_read - sizeof(struct sur40_header); 354 355 if (result % sizeof(struct sur40_blob) != 0) { 356 dev_err(sur40->dev, "transfer size mismatch\n"); 357 return; 358 } 359 360 /* first packet? */ 361 if (need_blobs == -1) { 362 need_blobs = le16_to_cpu(header->count); 363 dev_dbg(sur40->dev, "need %d blobs\n", need_blobs); 364 packet_id = le32_to_cpu(header->packet_id); 365 } 366 367 /* 368 * Sanity check. when video data is also being retrieved, the 369 * packet ID will usually increase in the middle of a series 370 * instead of at the end. 371 */ 372 if (packet_id != header->packet_id) 373 dev_dbg(sur40->dev, "packet ID mismatch\n"); 374 375 packet_blobs = result / sizeof(struct sur40_blob); 376 dev_dbg(sur40->dev, "received %d blobs\n", packet_blobs); 377 378 /* packets always contain at least 4 blobs, even if empty */ 379 if (packet_blobs > need_blobs) 380 packet_blobs = need_blobs; 381 382 for (i = 0; i < packet_blobs; i++) { 383 need_blobs--; 384 dev_dbg(sur40->dev, "processing blob\n"); 385 sur40_report_blob(&(inblob[i]), input); 386 } 387 388 } while (need_blobs > 0); 389 390 input_mt_sync_frame(input); 391 input_sync(input); 392 393 sur40_process_video(sur40); 394 } 395 396 /* deal with video data */ 397 static void sur40_process_video(struct sur40_state *sur40) 398 { 399 400 struct sur40_image_header *img = (void *)(sur40->bulk_in_buffer); 401 struct sur40_buffer *new_buf; 402 struct usb_sg_request sgr; 403 struct sg_table *sgt; 404 int result, bulk_read; 405 406 if (!vb2_start_streaming_called(&sur40->queue)) 407 return; 408 409 /* get a new buffer from the list */ 410 spin_lock(&sur40->qlock); 411 if (list_empty(&sur40->buf_list)) { 412 dev_dbg(sur40->dev, "buffer queue empty\n"); 413 spin_unlock(&sur40->qlock); 414 return; 415 } 416 new_buf = list_entry(sur40->buf_list.next, struct sur40_buffer, list); 417 list_del(&new_buf->list); 418 spin_unlock(&sur40->qlock); 419 420 dev_dbg(sur40->dev, "buffer acquired\n"); 421 422 /* retrieve data via bulk read */ 423 result = usb_bulk_msg(sur40->usbdev, 424 usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 425 sur40->bulk_in_buffer, sur40->bulk_in_size, 426 &bulk_read, 1000); 427 428 if (result < 0) { 429 dev_err(sur40->dev, "error in usb_bulk_read\n"); 430 goto err_poll; 431 } 432 433 if (bulk_read != sizeof(struct sur40_image_header)) { 434 dev_err(sur40->dev, "received %d bytes (%zd expected)\n", 435 bulk_read, sizeof(struct sur40_image_header)); 436 goto err_poll; 437 } 438 439 if (le32_to_cpu(img->magic) != VIDEO_HEADER_MAGIC) { 440 dev_err(sur40->dev, "image magic mismatch\n"); 441 goto err_poll; 442 } 443 444 if (le32_to_cpu(img->size) != sur40->pix_fmt.sizeimage) { 445 dev_err(sur40->dev, "image size mismatch\n"); 446 goto err_poll; 447 } 448 449 dev_dbg(sur40->dev, "header acquired\n"); 450 451 sgt = vb2_dma_sg_plane_desc(&new_buf->vb.vb2_buf, 0); 452 453 result = usb_sg_init(&sgr, sur40->usbdev, 454 usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0, 455 sgt->sgl, sgt->nents, sur40->pix_fmt.sizeimage, 0); 456 if (result < 0) { 457 dev_err(sur40->dev, "error %d in usb_sg_init\n", result); 458 goto err_poll; 459 } 460 461 usb_sg_wait(&sgr); 462 if (sgr.status < 0) { 463 dev_err(sur40->dev, "error %d in usb_sg_wait\n", sgr.status); 464 goto err_poll; 465 } 466 467 dev_dbg(sur40->dev, "image acquired\n"); 468 469 /* return error if streaming was stopped in the meantime */ 470 if (sur40->sequence == -1) 471 return; 472 473 /* mark as finished */ 474 new_buf->vb.vb2_buf.timestamp = ktime_get_ns(); 475 new_buf->vb.sequence = sur40->sequence++; 476 new_buf->vb.field = V4L2_FIELD_NONE; 477 vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_DONE); 478 dev_dbg(sur40->dev, "buffer marked done\n"); 479 return; 480 481 err_poll: 482 vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 483 } 484 485 /* Initialize input device parameters. */ 486 static void sur40_input_setup(struct input_dev *input_dev) 487 { 488 __set_bit(EV_KEY, input_dev->evbit); 489 __set_bit(EV_ABS, input_dev->evbit); 490 491 input_set_abs_params(input_dev, ABS_MT_POSITION_X, 492 0, SENSOR_RES_X, 0, 0); 493 input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 494 0, SENSOR_RES_Y, 0, 0); 495 496 input_set_abs_params(input_dev, ABS_MT_TOOL_X, 497 0, SENSOR_RES_X, 0, 0); 498 input_set_abs_params(input_dev, ABS_MT_TOOL_Y, 499 0, SENSOR_RES_Y, 0, 0); 500 501 /* max value unknown, but major/minor axis 502 * can never be larger than screen */ 503 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 504 0, SENSOR_RES_X, 0, 0); 505 input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 506 0, SENSOR_RES_Y, 0, 0); 507 508 input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0); 509 510 input_mt_init_slots(input_dev, MAX_CONTACTS, 511 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); 512 } 513 514 /* Check candidate USB interface. */ 515 static int sur40_probe(struct usb_interface *interface, 516 const struct usb_device_id *id) 517 { 518 struct usb_device *usbdev = interface_to_usbdev(interface); 519 struct sur40_state *sur40; 520 struct usb_host_interface *iface_desc; 521 struct usb_endpoint_descriptor *endpoint; 522 struct input_polled_dev *poll_dev; 523 int error; 524 525 /* Check if we really have the right interface. */ 526 iface_desc = &interface->altsetting[0]; 527 if (iface_desc->desc.bInterfaceClass != 0xFF) 528 return -ENODEV; 529 530 /* Use endpoint #4 (0x86). */ 531 endpoint = &iface_desc->endpoint[4].desc; 532 if (endpoint->bEndpointAddress != TOUCH_ENDPOINT) 533 return -ENODEV; 534 535 /* Allocate memory for our device state and initialize it. */ 536 sur40 = kzalloc(sizeof(struct sur40_state), GFP_KERNEL); 537 if (!sur40) 538 return -ENOMEM; 539 540 poll_dev = input_allocate_polled_device(); 541 if (!poll_dev) { 542 error = -ENOMEM; 543 goto err_free_dev; 544 } 545 546 /* initialize locks/lists */ 547 INIT_LIST_HEAD(&sur40->buf_list); 548 spin_lock_init(&sur40->qlock); 549 mutex_init(&sur40->lock); 550 551 /* Set up polled input device control structure */ 552 poll_dev->private = sur40; 553 poll_dev->poll_interval = POLL_INTERVAL; 554 poll_dev->open = sur40_open; 555 poll_dev->poll = sur40_poll; 556 poll_dev->close = sur40_close; 557 558 /* Set up regular input device structure */ 559 sur40_input_setup(poll_dev->input); 560 561 poll_dev->input->name = DRIVER_LONG; 562 usb_to_input_id(usbdev, &poll_dev->input->id); 563 usb_make_path(usbdev, sur40->phys, sizeof(sur40->phys)); 564 strlcat(sur40->phys, "/input0", sizeof(sur40->phys)); 565 poll_dev->input->phys = sur40->phys; 566 poll_dev->input->dev.parent = &interface->dev; 567 568 sur40->usbdev = usbdev; 569 sur40->dev = &interface->dev; 570 sur40->input = poll_dev; 571 572 /* use the bulk-in endpoint tested above */ 573 sur40->bulk_in_size = usb_endpoint_maxp(endpoint); 574 sur40->bulk_in_epaddr = endpoint->bEndpointAddress; 575 sur40->bulk_in_buffer = kmalloc(sur40->bulk_in_size, GFP_KERNEL); 576 if (!sur40->bulk_in_buffer) { 577 dev_err(&interface->dev, "Unable to allocate input buffer."); 578 error = -ENOMEM; 579 goto err_free_polldev; 580 } 581 582 /* register the polled input device */ 583 error = input_register_polled_device(poll_dev); 584 if (error) { 585 dev_err(&interface->dev, 586 "Unable to register polled input device."); 587 goto err_free_buffer; 588 } 589 590 /* register the video master device */ 591 snprintf(sur40->v4l2.name, sizeof(sur40->v4l2.name), "%s", DRIVER_LONG); 592 error = v4l2_device_register(sur40->dev, &sur40->v4l2); 593 if (error) { 594 dev_err(&interface->dev, 595 "Unable to register video master device."); 596 goto err_unreg_v4l2; 597 } 598 599 /* initialize the lock and subdevice */ 600 sur40->queue = sur40_queue; 601 sur40->queue.drv_priv = sur40; 602 sur40->queue.lock = &sur40->lock; 603 sur40->queue.dev = sur40->dev; 604 605 /* initialize the queue */ 606 error = vb2_queue_init(&sur40->queue); 607 if (error) 608 goto err_unreg_v4l2; 609 610 sur40->pix_fmt = sur40_pix_format[0]; 611 sur40->vdev = sur40_video_device; 612 sur40->vdev.v4l2_dev = &sur40->v4l2; 613 sur40->vdev.lock = &sur40->lock; 614 sur40->vdev.queue = &sur40->queue; 615 video_set_drvdata(&sur40->vdev, sur40); 616 617 error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1); 618 if (error) { 619 dev_err(&interface->dev, 620 "Unable to register video subdevice."); 621 goto err_unreg_video; 622 } 623 624 /* we can register the device now, as it is ready */ 625 usb_set_intfdata(interface, sur40); 626 dev_dbg(&interface->dev, "%s is now attached\n", DRIVER_DESC); 627 628 return 0; 629 630 err_unreg_video: 631 video_unregister_device(&sur40->vdev); 632 err_unreg_v4l2: 633 v4l2_device_unregister(&sur40->v4l2); 634 err_free_buffer: 635 kfree(sur40->bulk_in_buffer); 636 err_free_polldev: 637 input_free_polled_device(sur40->input); 638 err_free_dev: 639 kfree(sur40); 640 641 return error; 642 } 643 644 /* Unregister device & clean up. */ 645 static void sur40_disconnect(struct usb_interface *interface) 646 { 647 struct sur40_state *sur40 = usb_get_intfdata(interface); 648 649 video_unregister_device(&sur40->vdev); 650 v4l2_device_unregister(&sur40->v4l2); 651 652 input_unregister_polled_device(sur40->input); 653 input_free_polled_device(sur40->input); 654 kfree(sur40->bulk_in_buffer); 655 kfree(sur40); 656 657 usb_set_intfdata(interface, NULL); 658 dev_dbg(&interface->dev, "%s is now disconnected\n", DRIVER_DESC); 659 } 660 661 /* 662 * Setup the constraints of the queue: besides setting the number of planes 663 * per buffer and the size and allocation context of each plane, it also 664 * checks if sufficient buffers have been allocated. Usually 3 is a good 665 * minimum number: many DMA engines need a minimum of 2 buffers in the 666 * queue and you need to have another available for userspace processing. 667 */ 668 static int sur40_queue_setup(struct vb2_queue *q, 669 unsigned int *nbuffers, unsigned int *nplanes, 670 unsigned int sizes[], struct device *alloc_devs[]) 671 { 672 struct sur40_state *sur40 = vb2_get_drv_priv(q); 673 674 if (q->num_buffers + *nbuffers < 3) 675 *nbuffers = 3 - q->num_buffers; 676 677 if (*nplanes) 678 return sizes[0] < sur40->pix_fmt.sizeimage ? -EINVAL : 0; 679 680 *nplanes = 1; 681 sizes[0] = sur40->pix_fmt.sizeimage; 682 683 return 0; 684 } 685 686 /* 687 * Prepare the buffer for queueing to the DMA engine: check and set the 688 * payload size. 689 */ 690 static int sur40_buffer_prepare(struct vb2_buffer *vb) 691 { 692 struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue); 693 unsigned long size = sur40->pix_fmt.sizeimage; 694 695 if (vb2_plane_size(vb, 0) < size) { 696 dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n", 697 vb2_plane_size(vb, 0), size); 698 return -EINVAL; 699 } 700 701 vb2_set_plane_payload(vb, 0, size); 702 return 0; 703 } 704 705 /* 706 * Queue this buffer to the DMA engine. 707 */ 708 static void sur40_buffer_queue(struct vb2_buffer *vb) 709 { 710 struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue); 711 struct sur40_buffer *buf = (struct sur40_buffer *)vb; 712 713 spin_lock(&sur40->qlock); 714 list_add_tail(&buf->list, &sur40->buf_list); 715 spin_unlock(&sur40->qlock); 716 } 717 718 static void return_all_buffers(struct sur40_state *sur40, 719 enum vb2_buffer_state state) 720 { 721 struct sur40_buffer *buf, *node; 722 723 spin_lock(&sur40->qlock); 724 list_for_each_entry_safe(buf, node, &sur40->buf_list, list) { 725 vb2_buffer_done(&buf->vb.vb2_buf, state); 726 list_del(&buf->list); 727 } 728 spin_unlock(&sur40->qlock); 729 } 730 731 /* 732 * Start streaming. First check if the minimum number of buffers have been 733 * queued. If not, then return -ENOBUFS and the vb2 framework will call 734 * this function again the next time a buffer has been queued until enough 735 * buffers are available to actually start the DMA engine. 736 */ 737 static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count) 738 { 739 struct sur40_state *sur40 = vb2_get_drv_priv(vq); 740 741 sur40->sequence = 0; 742 return 0; 743 } 744 745 /* 746 * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued 747 * and passed on to the vb2 framework marked as STATE_ERROR. 748 */ 749 static void sur40_stop_streaming(struct vb2_queue *vq) 750 { 751 struct sur40_state *sur40 = vb2_get_drv_priv(vq); 752 vb2_wait_for_all_buffers(vq); 753 sur40->sequence = -1; 754 755 /* Release all active buffers */ 756 return_all_buffers(sur40, VB2_BUF_STATE_ERROR); 757 } 758 759 /* V4L ioctl */ 760 static int sur40_vidioc_querycap(struct file *file, void *priv, 761 struct v4l2_capability *cap) 762 { 763 struct sur40_state *sur40 = video_drvdata(file); 764 765 strlcpy(cap->driver, DRIVER_SHORT, sizeof(cap->driver)); 766 strlcpy(cap->card, DRIVER_LONG, sizeof(cap->card)); 767 usb_make_path(sur40->usbdev, cap->bus_info, sizeof(cap->bus_info)); 768 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH | 769 V4L2_CAP_READWRITE | 770 V4L2_CAP_STREAMING; 771 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 772 return 0; 773 } 774 775 static int sur40_vidioc_enum_input(struct file *file, void *priv, 776 struct v4l2_input *i) 777 { 778 if (i->index != 0) 779 return -EINVAL; 780 i->type = V4L2_INPUT_TYPE_TOUCH; 781 i->std = V4L2_STD_UNKNOWN; 782 strlcpy(i->name, "In-Cell Sensor", sizeof(i->name)); 783 i->capabilities = 0; 784 return 0; 785 } 786 787 static int sur40_vidioc_s_input(struct file *file, void *priv, unsigned int i) 788 { 789 return (i == 0) ? 0 : -EINVAL; 790 } 791 792 static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i) 793 { 794 *i = 0; 795 return 0; 796 } 797 798 static int sur40_vidioc_try_fmt(struct file *file, void *priv, 799 struct v4l2_format *f) 800 { 801 switch (f->fmt.pix.pixelformat) { 802 case V4L2_PIX_FMT_GREY: 803 f->fmt.pix = sur40_pix_format[1]; 804 break; 805 806 default: 807 f->fmt.pix = sur40_pix_format[0]; 808 break; 809 } 810 811 return 0; 812 } 813 814 static int sur40_vidioc_s_fmt(struct file *file, void *priv, 815 struct v4l2_format *f) 816 { 817 struct sur40_state *sur40 = video_drvdata(file); 818 819 switch (f->fmt.pix.pixelformat) { 820 case V4L2_PIX_FMT_GREY: 821 sur40->pix_fmt = sur40_pix_format[1]; 822 break; 823 824 default: 825 sur40->pix_fmt = sur40_pix_format[0]; 826 break; 827 } 828 829 f->fmt.pix = sur40->pix_fmt; 830 return 0; 831 } 832 833 static int sur40_vidioc_g_fmt(struct file *file, void *priv, 834 struct v4l2_format *f) 835 { 836 struct sur40_state *sur40 = video_drvdata(file); 837 838 f->fmt.pix = sur40->pix_fmt; 839 return 0; 840 } 841 842 static int sur40_ioctl_parm(struct file *file, void *priv, 843 struct v4l2_streamparm *p) 844 { 845 if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 846 return -EINVAL; 847 848 p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; 849 p->parm.capture.timeperframe.numerator = 1; 850 p->parm.capture.timeperframe.denominator = 60; 851 p->parm.capture.readbuffers = 3; 852 return 0; 853 } 854 855 static int sur40_vidioc_enum_fmt(struct file *file, void *priv, 856 struct v4l2_fmtdesc *f) 857 { 858 if (f->index >= ARRAY_SIZE(sur40_pix_format)) 859 return -EINVAL; 860 861 f->pixelformat = sur40_pix_format[f->index].pixelformat; 862 f->flags = 0; 863 return 0; 864 } 865 866 static int sur40_vidioc_enum_framesizes(struct file *file, void *priv, 867 struct v4l2_frmsizeenum *f) 868 { 869 struct sur40_state *sur40 = video_drvdata(file); 870 871 if ((f->index != 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08) 872 && (f->pixel_format != V4L2_PIX_FMT_GREY))) 873 return -EINVAL; 874 875 f->type = V4L2_FRMSIZE_TYPE_DISCRETE; 876 f->discrete.width = sur40->pix_fmt.width; 877 f->discrete.height = sur40->pix_fmt.height; 878 return 0; 879 } 880 881 static int sur40_vidioc_enum_frameintervals(struct file *file, void *priv, 882 struct v4l2_frmivalenum *f) 883 { 884 struct sur40_state *sur40 = video_drvdata(file); 885 886 if ((f->index > 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08) 887 && (f->pixel_format != V4L2_PIX_FMT_GREY)) 888 || (f->width != sur40->pix_fmt.width) 889 || (f->height != sur40->pix_fmt.height)) 890 return -EINVAL; 891 892 f->type = V4L2_FRMIVAL_TYPE_DISCRETE; 893 f->discrete.denominator = 60; 894 f->discrete.numerator = 1; 895 return 0; 896 } 897 898 899 static const struct usb_device_id sur40_table[] = { 900 { USB_DEVICE(ID_MICROSOFT, ID_SUR40) }, /* Samsung SUR40 */ 901 { } /* terminating null entry */ 902 }; 903 MODULE_DEVICE_TABLE(usb, sur40_table); 904 905 /* V4L2 structures */ 906 static const struct vb2_ops sur40_queue_ops = { 907 .queue_setup = sur40_queue_setup, 908 .buf_prepare = sur40_buffer_prepare, 909 .buf_queue = sur40_buffer_queue, 910 .start_streaming = sur40_start_streaming, 911 .stop_streaming = sur40_stop_streaming, 912 .wait_prepare = vb2_ops_wait_prepare, 913 .wait_finish = vb2_ops_wait_finish, 914 }; 915 916 static const struct vb2_queue sur40_queue = { 917 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, 918 /* 919 * VB2_USERPTR in currently not enabled: passing a user pointer to 920 * dma-sg will result in segment sizes that are not a multiple of 921 * 512 bytes, which is required by the host controller. 922 */ 923 .io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF, 924 .buf_struct_size = sizeof(struct sur40_buffer), 925 .ops = &sur40_queue_ops, 926 .mem_ops = &vb2_dma_sg_memops, 927 .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC, 928 .min_buffers_needed = 3, 929 }; 930 931 static const struct v4l2_file_operations sur40_video_fops = { 932 .owner = THIS_MODULE, 933 .open = v4l2_fh_open, 934 .release = vb2_fop_release, 935 .unlocked_ioctl = video_ioctl2, 936 .read = vb2_fop_read, 937 .mmap = vb2_fop_mmap, 938 .poll = vb2_fop_poll, 939 }; 940 941 static const struct v4l2_ioctl_ops sur40_video_ioctl_ops = { 942 943 .vidioc_querycap = sur40_vidioc_querycap, 944 945 .vidioc_enum_fmt_vid_cap = sur40_vidioc_enum_fmt, 946 .vidioc_try_fmt_vid_cap = sur40_vidioc_try_fmt, 947 .vidioc_s_fmt_vid_cap = sur40_vidioc_s_fmt, 948 .vidioc_g_fmt_vid_cap = sur40_vidioc_g_fmt, 949 950 .vidioc_enum_framesizes = sur40_vidioc_enum_framesizes, 951 .vidioc_enum_frameintervals = sur40_vidioc_enum_frameintervals, 952 953 .vidioc_g_parm = sur40_ioctl_parm, 954 .vidioc_s_parm = sur40_ioctl_parm, 955 956 .vidioc_enum_input = sur40_vidioc_enum_input, 957 .vidioc_g_input = sur40_vidioc_g_input, 958 .vidioc_s_input = sur40_vidioc_s_input, 959 960 .vidioc_reqbufs = vb2_ioctl_reqbufs, 961 .vidioc_create_bufs = vb2_ioctl_create_bufs, 962 .vidioc_querybuf = vb2_ioctl_querybuf, 963 .vidioc_qbuf = vb2_ioctl_qbuf, 964 .vidioc_dqbuf = vb2_ioctl_dqbuf, 965 .vidioc_expbuf = vb2_ioctl_expbuf, 966 967 .vidioc_streamon = vb2_ioctl_streamon, 968 .vidioc_streamoff = vb2_ioctl_streamoff, 969 }; 970 971 static const struct video_device sur40_video_device = { 972 .name = DRIVER_LONG, 973 .fops = &sur40_video_fops, 974 .ioctl_ops = &sur40_video_ioctl_ops, 975 .release = video_device_release_empty, 976 }; 977 978 /* USB-specific object needed to register this driver with the USB subsystem. */ 979 static struct usb_driver sur40_driver = { 980 .name = DRIVER_SHORT, 981 .probe = sur40_probe, 982 .disconnect = sur40_disconnect, 983 .id_table = sur40_table, 984 }; 985 986 module_usb_driver(sur40_driver); 987 988 MODULE_AUTHOR(DRIVER_AUTHOR); 989 MODULE_DESCRIPTION(DRIVER_DESC); 990 MODULE_LICENSE("GPL"); 991