1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Apple USB Touchpad (for post-February 2005 PowerBooks and MacBooks) driver 4 * 5 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com) 6 * Copyright (C) 2005-2008 Johannes Berg (johannes@sipsolutions.net) 7 * Copyright (C) 2005-2008 Stelian Pop (stelian@popies.net) 8 * Copyright (C) 2005 Frank Arnold (frank@scirocco-5v-turbo.de) 9 * Copyright (C) 2005 Peter Osterlund (petero2@telia.com) 10 * Copyright (C) 2005 Michael Hanselmann (linux-kernel@hansmi.ch) 11 * Copyright (C) 2006 Nicolas Boichat (nicolas@boichat.ch) 12 * Copyright (C) 2007-2008 Sven Anders (anders@anduras.de) 13 * 14 * Thanks to Alex Harper <basilisk@foobox.net> for his inputs. 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/errno.h> 19 #include <linux/slab.h> 20 #include <linux/module.h> 21 #include <linux/usb/input.h> 22 23 /* 24 * Note: We try to keep the touchpad aspect ratio while still doing only 25 * simple arithmetics: 26 * 0 <= x <= (xsensors - 1) * xfact 27 * 0 <= y <= (ysensors - 1) * yfact 28 */ 29 struct atp_info { 30 int xsensors; /* number of X sensors */ 31 int xsensors_17; /* 17" models have more sensors */ 32 int ysensors; /* number of Y sensors */ 33 int xfact; /* X multiplication factor */ 34 int yfact; /* Y multiplication factor */ 35 int datalen; /* size of USB transfers */ 36 void (*callback)(struct urb *); /* callback function */ 37 int fuzz; /* fuzz touchpad generates */ 38 }; 39 40 static void atp_complete_geyser_1_2(struct urb *urb); 41 static void atp_complete_geyser_3_4(struct urb *urb); 42 43 static const struct atp_info fountain_info = { 44 .xsensors = 16, 45 .xsensors_17 = 26, 46 .ysensors = 16, 47 .xfact = 64, 48 .yfact = 43, 49 .datalen = 81, 50 .callback = atp_complete_geyser_1_2, 51 .fuzz = 16, 52 }; 53 54 static const struct atp_info geyser1_info = { 55 .xsensors = 16, 56 .xsensors_17 = 26, 57 .ysensors = 16, 58 .xfact = 64, 59 .yfact = 43, 60 .datalen = 81, 61 .callback = atp_complete_geyser_1_2, 62 .fuzz = 16, 63 }; 64 65 static const struct atp_info geyser2_info = { 66 .xsensors = 15, 67 .xsensors_17 = 20, 68 .ysensors = 9, 69 .xfact = 64, 70 .yfact = 43, 71 .datalen = 64, 72 .callback = atp_complete_geyser_1_2, 73 .fuzz = 0, 74 }; 75 76 static const struct atp_info geyser3_info = { 77 .xsensors = 20, 78 .ysensors = 10, 79 .xfact = 64, 80 .yfact = 64, 81 .datalen = 64, 82 .callback = atp_complete_geyser_3_4, 83 .fuzz = 0, 84 }; 85 86 static const struct atp_info geyser4_info = { 87 .xsensors = 20, 88 .ysensors = 10, 89 .xfact = 64, 90 .yfact = 64, 91 .datalen = 64, 92 .callback = atp_complete_geyser_3_4, 93 .fuzz = 0, 94 }; 95 96 #define ATP_DEVICE(prod, info) \ 97 { \ 98 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ 99 USB_DEVICE_ID_MATCH_INT_CLASS | \ 100 USB_DEVICE_ID_MATCH_INT_PROTOCOL, \ 101 .idVendor = 0x05ac, /* Apple */ \ 102 .idProduct = (prod), \ 103 .bInterfaceClass = 0x03, \ 104 .bInterfaceProtocol = 0x02, \ 105 .driver_info = (unsigned long) &info, \ 106 } 107 108 /* 109 * Table of devices (Product IDs) that work with this driver. 110 * (The names come from Info.plist in AppleUSBTrackpad.kext, 111 * According to Info.plist Geyser IV is the same as Geyser III.) 112 */ 113 114 static const struct usb_device_id atp_table[] = { 115 /* PowerBooks Feb 2005, iBooks G4 */ 116 ATP_DEVICE(0x020e, fountain_info), /* FOUNTAIN ANSI */ 117 ATP_DEVICE(0x020f, fountain_info), /* FOUNTAIN ISO */ 118 ATP_DEVICE(0x030a, fountain_info), /* FOUNTAIN TP ONLY */ 119 ATP_DEVICE(0x030b, geyser1_info), /* GEYSER 1 TP ONLY */ 120 121 /* PowerBooks Oct 2005 */ 122 ATP_DEVICE(0x0214, geyser2_info), /* GEYSER 2 ANSI */ 123 ATP_DEVICE(0x0215, geyser2_info), /* GEYSER 2 ISO */ 124 ATP_DEVICE(0x0216, geyser2_info), /* GEYSER 2 JIS */ 125 126 /* Core Duo MacBook & MacBook Pro */ 127 ATP_DEVICE(0x0217, geyser3_info), /* GEYSER 3 ANSI */ 128 ATP_DEVICE(0x0218, geyser3_info), /* GEYSER 3 ISO */ 129 ATP_DEVICE(0x0219, geyser3_info), /* GEYSER 3 JIS */ 130 131 /* Core2 Duo MacBook & MacBook Pro */ 132 ATP_DEVICE(0x021a, geyser4_info), /* GEYSER 4 ANSI */ 133 ATP_DEVICE(0x021b, geyser4_info), /* GEYSER 4 ISO */ 134 ATP_DEVICE(0x021c, geyser4_info), /* GEYSER 4 JIS */ 135 136 /* Core2 Duo MacBook3,1 */ 137 ATP_DEVICE(0x0229, geyser4_info), /* GEYSER 4 HF ANSI */ 138 ATP_DEVICE(0x022a, geyser4_info), /* GEYSER 4 HF ISO */ 139 ATP_DEVICE(0x022b, geyser4_info), /* GEYSER 4 HF JIS */ 140 141 /* Terminating entry */ 142 { } 143 }; 144 MODULE_DEVICE_TABLE(usb, atp_table); 145 146 /* maximum number of sensors */ 147 #define ATP_XSENSORS 26 148 #define ATP_YSENSORS 16 149 150 /* 151 * The largest possible bank of sensors with additional buffer of 4 extra values 152 * on either side, for an array of smoothed sensor values. 153 */ 154 #define ATP_SMOOTHSIZE 34 155 156 /* maximum pressure this driver will report */ 157 #define ATP_PRESSURE 300 158 159 /* 160 * Threshold for the touchpad sensors. Any change less than ATP_THRESHOLD is 161 * ignored. 162 */ 163 #define ATP_THRESHOLD 5 164 165 /* 166 * How far we'll bitshift our sensor values before averaging them. Mitigates 167 * rounding errors. 168 */ 169 #define ATP_SCALE 12 170 171 /* Geyser initialization constants */ 172 #define ATP_GEYSER_MODE_READ_REQUEST_ID 1 173 #define ATP_GEYSER_MODE_WRITE_REQUEST_ID 9 174 #define ATP_GEYSER_MODE_REQUEST_VALUE 0x300 175 #define ATP_GEYSER_MODE_REQUEST_INDEX 0 176 #define ATP_GEYSER_MODE_VENDOR_VALUE 0x04 177 178 /** 179 * enum atp_status_bits - status bit meanings 180 * 181 * These constants represent the meaning of the status bits. 182 * (only Geyser 3/4) 183 * 184 * @ATP_STATUS_BUTTON: The button was pressed 185 * @ATP_STATUS_BASE_UPDATE: Update of the base values (untouched pad) 186 * @ATP_STATUS_FROM_RESET: Reset previously performed 187 */ 188 enum atp_status_bits { 189 ATP_STATUS_BUTTON = BIT(0), 190 ATP_STATUS_BASE_UPDATE = BIT(2), 191 ATP_STATUS_FROM_RESET = BIT(4), 192 }; 193 194 /* Structure to hold all of our device specific stuff */ 195 struct atp { 196 char phys[64]; 197 struct usb_device *udev; /* usb device */ 198 struct usb_interface *intf; /* usb interface */ 199 struct urb *urb; /* usb request block */ 200 u8 *data; /* transferred data */ 201 struct input_dev *input; /* input dev */ 202 const struct atp_info *info; /* touchpad model */ 203 bool open; 204 bool valid; /* are the samples valid? */ 205 bool size_detect_done; 206 bool overflow_warned; 207 int fingers_old; /* last reported finger count */ 208 int x_old; /* last reported x/y, */ 209 int y_old; /* used for smoothing */ 210 signed char xy_cur[ATP_XSENSORS + ATP_YSENSORS]; 211 signed char xy_old[ATP_XSENSORS + ATP_YSENSORS]; 212 int xy_acc[ATP_XSENSORS + ATP_YSENSORS]; 213 int smooth[ATP_SMOOTHSIZE]; 214 int smooth_tmp[ATP_SMOOTHSIZE]; 215 int idlecount; /* number of empty packets */ 216 struct work_struct work; 217 }; 218 219 #define dbg_dump(msg, tab) \ 220 if (debug > 1) { \ 221 int __i; \ 222 printk(KERN_DEBUG "appletouch: %s", msg); \ 223 for (__i = 0; __i < ATP_XSENSORS + ATP_YSENSORS; __i++) \ 224 printk(" %02x", tab[__i]); \ 225 printk("\n"); \ 226 } 227 228 #define dprintk(format, a...) \ 229 do { \ 230 if (debug) \ 231 printk(KERN_DEBUG format, ##a); \ 232 } while (0) 233 234 MODULE_AUTHOR("Johannes Berg"); 235 MODULE_AUTHOR("Stelian Pop"); 236 MODULE_AUTHOR("Frank Arnold"); 237 MODULE_AUTHOR("Michael Hanselmann"); 238 MODULE_AUTHOR("Sven Anders"); 239 MODULE_DESCRIPTION("Apple PowerBook and MacBook USB touchpad driver"); 240 MODULE_LICENSE("GPL"); 241 242 /* 243 * Make the threshold a module parameter 244 */ 245 static int threshold = ATP_THRESHOLD; 246 module_param(threshold, int, 0644); 247 MODULE_PARM_DESC(threshold, "Discard any change in data from a sensor" 248 " (the trackpad has many of these sensors)" 249 " less than this value."); 250 251 static int debug; 252 module_param(debug, int, 0644); 253 MODULE_PARM_DESC(debug, "Activate debugging output"); 254 255 /* 256 * By default newer Geyser devices send standard USB HID mouse 257 * packets (Report ID 2). This code changes device mode, so it 258 * sends raw sensor reports (Report ID 5). 259 */ 260 static int atp_geyser_init(struct atp *dev) 261 { 262 struct usb_device *udev = dev->udev; 263 char *data; 264 int size; 265 int i; 266 int ret; 267 268 data = kmalloc(8, GFP_KERNEL); 269 if (!data) { 270 dev_err(&dev->intf->dev, "Out of memory\n"); 271 return -ENOMEM; 272 } 273 274 size = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 275 ATP_GEYSER_MODE_READ_REQUEST_ID, 276 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 277 ATP_GEYSER_MODE_REQUEST_VALUE, 278 ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000); 279 280 if (size != 8) { 281 dprintk("atp_geyser_init: read error\n"); 282 for (i = 0; i < 8; i++) 283 dprintk("appletouch[%d]: %d\n", i, data[i]); 284 285 dev_err(&dev->intf->dev, "Failed to read mode from device.\n"); 286 ret = -EIO; 287 goto out_free; 288 } 289 290 /* Apply the mode switch */ 291 data[0] = ATP_GEYSER_MODE_VENDOR_VALUE; 292 293 size = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 294 ATP_GEYSER_MODE_WRITE_REQUEST_ID, 295 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 296 ATP_GEYSER_MODE_REQUEST_VALUE, 297 ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000); 298 299 if (size != 8) { 300 dprintk("atp_geyser_init: write error\n"); 301 for (i = 0; i < 8; i++) 302 dprintk("appletouch[%d]: %d\n", i, data[i]); 303 304 dev_err(&dev->intf->dev, "Failed to request geyser raw mode\n"); 305 ret = -EIO; 306 goto out_free; 307 } 308 ret = 0; 309 out_free: 310 kfree(data); 311 return ret; 312 } 313 314 /* 315 * Reinitialise the device. This usually stops stream of empty packets 316 * coming from it. 317 */ 318 static void atp_reinit(struct work_struct *work) 319 { 320 struct atp *dev = container_of(work, struct atp, work); 321 int retval; 322 323 dprintk("appletouch: putting appletouch to sleep (reinit)\n"); 324 atp_geyser_init(dev); 325 326 retval = usb_submit_urb(dev->urb, GFP_ATOMIC); 327 if (retval) 328 dev_err(&dev->intf->dev, 329 "atp_reinit: usb_submit_urb failed with error %d\n", 330 retval); 331 } 332 333 static int atp_calculate_abs(struct atp *dev, int offset, int nb_sensors, 334 int fact, int *z, int *fingers) 335 { 336 int i, pass; 337 338 /* 339 * Use offset to point xy_sensors at the first value in dev->xy_acc 340 * for whichever dimension we're looking at this particular go-round. 341 */ 342 int *xy_sensors = dev->xy_acc + offset; 343 344 /* values to calculate mean */ 345 int pcum = 0, psum = 0; 346 int is_increasing = 0; 347 348 *fingers = 0; 349 350 for (i = 0; i < nb_sensors; i++) { 351 if (xy_sensors[i] < threshold) { 352 if (is_increasing) 353 is_increasing = 0; 354 355 /* 356 * Makes the finger detection more versatile. For example, 357 * two fingers with no gap will be detected. Also, my 358 * tests show it less likely to have intermittent loss 359 * of multiple finger readings while moving around (scrolling). 360 * 361 * Changes the multiple finger detection to counting humps on 362 * sensors (transitions from nonincreasing to increasing) 363 * instead of counting transitions from low sensors (no 364 * finger reading) to high sensors (finger above 365 * sensor) 366 * 367 * - Jason Parekh <jasonparekh@gmail.com> 368 */ 369 370 } else if (i < 1 || 371 (!is_increasing && xy_sensors[i - 1] < xy_sensors[i])) { 372 (*fingers)++; 373 is_increasing = 1; 374 } else if (i > 0 && (xy_sensors[i - 1] - xy_sensors[i] > threshold)) { 375 is_increasing = 0; 376 } 377 } 378 379 if (*fingers < 1) /* No need to continue if no fingers are found. */ 380 return 0; 381 382 /* 383 * Use a smoothed version of sensor data for movement calculations, to 384 * combat noise without needing to rely so heavily on a threshold. 385 * This improves tracking. 386 * 387 * The smoothed array is bigger than the original so that the smoothing 388 * doesn't result in edge values being truncated. 389 */ 390 391 memset(dev->smooth, 0, 4 * sizeof(dev->smooth[0])); 392 /* Pull base values, scaled up to help avoid truncation errors. */ 393 for (i = 0; i < nb_sensors; i++) 394 dev->smooth[i + 4] = xy_sensors[i] << ATP_SCALE; 395 memset(&dev->smooth[nb_sensors + 4], 0, 4 * sizeof(dev->smooth[0])); 396 397 for (pass = 0; pass < 4; pass++) { 398 /* Handle edge. */ 399 dev->smooth_tmp[0] = (dev->smooth[0] + dev->smooth[1]) / 2; 400 401 /* Average values with neighbors. */ 402 for (i = 1; i < nb_sensors + 7; i++) 403 dev->smooth_tmp[i] = (dev->smooth[i - 1] + 404 dev->smooth[i] * 2 + 405 dev->smooth[i + 1]) / 4; 406 407 /* Handle other edge. */ 408 dev->smooth_tmp[i] = (dev->smooth[i - 1] + dev->smooth[i]) / 2; 409 410 memcpy(dev->smooth, dev->smooth_tmp, sizeof(dev->smooth)); 411 } 412 413 for (i = 0; i < nb_sensors + 8; i++) { 414 /* 415 * Skip values if they're small enough to be truncated to 0 416 * by scale. Mostly noise. 417 */ 418 if ((dev->smooth[i] >> ATP_SCALE) > 0) { 419 pcum += dev->smooth[i] * i; 420 psum += dev->smooth[i]; 421 } 422 } 423 424 if (psum > 0) { 425 *z = psum >> ATP_SCALE; /* Scale down pressure output. */ 426 return pcum * fact / psum; 427 } 428 429 return 0; 430 } 431 432 static inline void atp_report_fingers(struct input_dev *input, int fingers) 433 { 434 input_report_key(input, BTN_TOOL_FINGER, fingers == 1); 435 input_report_key(input, BTN_TOOL_DOUBLETAP, fingers == 2); 436 input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2); 437 } 438 439 /* Check URB status and for correct length of data package */ 440 441 #define ATP_URB_STATUS_SUCCESS 0 442 #define ATP_URB_STATUS_ERROR 1 443 #define ATP_URB_STATUS_ERROR_FATAL 2 444 445 static int atp_status_check(struct urb *urb) 446 { 447 struct atp *dev = urb->context; 448 struct usb_interface *intf = dev->intf; 449 450 switch (urb->status) { 451 case 0: 452 /* success */ 453 break; 454 case -EOVERFLOW: 455 if (!dev->overflow_warned) { 456 dev_warn(&intf->dev, 457 "appletouch: OVERFLOW with data length %d, actual length is %d\n", 458 dev->info->datalen, dev->urb->actual_length); 459 dev->overflow_warned = true; 460 } 461 fallthrough; 462 case -ECONNRESET: 463 case -ENOENT: 464 case -ESHUTDOWN: 465 /* This urb is terminated, clean up */ 466 dev_dbg(&intf->dev, 467 "atp_complete: urb shutting down with status: %d\n", 468 urb->status); 469 return ATP_URB_STATUS_ERROR_FATAL; 470 471 default: 472 dev_dbg(&intf->dev, 473 "atp_complete: nonzero urb status received: %d\n", 474 urb->status); 475 return ATP_URB_STATUS_ERROR; 476 } 477 478 /* drop incomplete datasets */ 479 if (dev->urb->actual_length != dev->info->datalen) { 480 dprintk("appletouch: incomplete data package" 481 " (first byte: %d, length: %d).\n", 482 dev->data[0], dev->urb->actual_length); 483 return ATP_URB_STATUS_ERROR; 484 } 485 486 return ATP_URB_STATUS_SUCCESS; 487 } 488 489 static void atp_detect_size(struct atp *dev) 490 { 491 int i; 492 493 /* 17" Powerbooks have extra X sensors */ 494 for (i = dev->info->xsensors; i < ATP_XSENSORS; i++) { 495 if (dev->xy_cur[i]) { 496 497 dev_info(&dev->intf->dev, 498 "appletouch: 17\" model detected.\n"); 499 500 input_set_abs_params(dev->input, ABS_X, 0, 501 (dev->info->xsensors_17 - 1) * 502 dev->info->xfact - 1, 503 dev->info->fuzz, 0); 504 break; 505 } 506 } 507 } 508 509 /* 510 * USB interrupt callback functions 511 */ 512 513 /* Interrupt function for older touchpads: FOUNTAIN/GEYSER1/GEYSER2 */ 514 515 static void atp_complete_geyser_1_2(struct urb *urb) 516 { 517 int x, y, x_z, y_z, x_f, y_f; 518 int retval, i, j; 519 int key, fingers; 520 struct atp *dev = urb->context; 521 int status = atp_status_check(urb); 522 523 if (status == ATP_URB_STATUS_ERROR_FATAL) 524 return; 525 else if (status == ATP_URB_STATUS_ERROR) 526 goto exit; 527 528 /* reorder the sensors values */ 529 if (dev->info == &geyser2_info) { 530 memset(dev->xy_cur, 0, sizeof(dev->xy_cur)); 531 532 /* 533 * The values are laid out like this: 534 * Y1, Y2, -, Y3, Y4, -, ..., X1, X2, -, X3, X4, -, ... 535 * '-' is an unused value. 536 */ 537 538 /* read X values */ 539 for (i = 0, j = 19; i < 20; i += 2, j += 3) { 540 dev->xy_cur[i] = dev->data[j]; 541 dev->xy_cur[i + 1] = dev->data[j + 1]; 542 } 543 544 /* read Y values */ 545 for (i = 0, j = 1; i < 9; i += 2, j += 3) { 546 dev->xy_cur[ATP_XSENSORS + i] = dev->data[j]; 547 dev->xy_cur[ATP_XSENSORS + i + 1] = dev->data[j + 1]; 548 } 549 } else { 550 for (i = 0; i < 8; i++) { 551 /* X values */ 552 dev->xy_cur[i + 0] = dev->data[5 * i + 2]; 553 dev->xy_cur[i + 8] = dev->data[5 * i + 4]; 554 dev->xy_cur[i + 16] = dev->data[5 * i + 42]; 555 if (i < 2) 556 dev->xy_cur[i + 24] = dev->data[5 * i + 44]; 557 558 /* Y values */ 559 dev->xy_cur[ATP_XSENSORS + i] = dev->data[5 * i + 1]; 560 dev->xy_cur[ATP_XSENSORS + i + 8] = dev->data[5 * i + 3]; 561 } 562 } 563 564 dbg_dump("sample", dev->xy_cur); 565 566 if (!dev->valid) { 567 /* first sample */ 568 dev->valid = true; 569 dev->x_old = dev->y_old = -1; 570 571 /* Store first sample */ 572 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old)); 573 574 /* Perform size detection, if not done already */ 575 if (unlikely(!dev->size_detect_done)) { 576 atp_detect_size(dev); 577 dev->size_detect_done = true; 578 goto exit; 579 } 580 } 581 582 for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) { 583 /* accumulate the change */ 584 signed char change = dev->xy_old[i] - dev->xy_cur[i]; 585 dev->xy_acc[i] -= change; 586 587 /* prevent down drifting */ 588 if (dev->xy_acc[i] < 0) 589 dev->xy_acc[i] = 0; 590 } 591 592 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old)); 593 594 dbg_dump("accumulator", dev->xy_acc); 595 596 x = atp_calculate_abs(dev, 0, ATP_XSENSORS, 597 dev->info->xfact, &x_z, &x_f); 598 y = atp_calculate_abs(dev, ATP_XSENSORS, ATP_YSENSORS, 599 dev->info->yfact, &y_z, &y_f); 600 key = dev->data[dev->info->datalen - 1] & ATP_STATUS_BUTTON; 601 602 fingers = max(x_f, y_f); 603 604 if (x && y && fingers == dev->fingers_old) { 605 if (dev->x_old != -1) { 606 x = (dev->x_old * 7 + x) >> 3; 607 y = (dev->y_old * 7 + y) >> 3; 608 dev->x_old = x; 609 dev->y_old = y; 610 611 if (debug > 1) 612 printk(KERN_DEBUG "appletouch: " 613 "X: %3d Y: %3d Xz: %3d Yz: %3d\n", 614 x, y, x_z, y_z); 615 616 input_report_key(dev->input, BTN_TOUCH, 1); 617 input_report_abs(dev->input, ABS_X, x); 618 input_report_abs(dev->input, ABS_Y, y); 619 input_report_abs(dev->input, ABS_PRESSURE, 620 min(ATP_PRESSURE, x_z + y_z)); 621 atp_report_fingers(dev->input, fingers); 622 } 623 dev->x_old = x; 624 dev->y_old = y; 625 626 } else if (!x && !y) { 627 628 dev->x_old = dev->y_old = -1; 629 dev->fingers_old = 0; 630 input_report_key(dev->input, BTN_TOUCH, 0); 631 input_report_abs(dev->input, ABS_PRESSURE, 0); 632 atp_report_fingers(dev->input, 0); 633 634 /* reset the accumulator on release */ 635 memset(dev->xy_acc, 0, sizeof(dev->xy_acc)); 636 } 637 638 if (fingers != dev->fingers_old) 639 dev->x_old = dev->y_old = -1; 640 dev->fingers_old = fingers; 641 642 input_report_key(dev->input, BTN_LEFT, key); 643 input_sync(dev->input); 644 645 exit: 646 retval = usb_submit_urb(dev->urb, GFP_ATOMIC); 647 if (retval) 648 dev_err(&dev->intf->dev, 649 "atp_complete: usb_submit_urb failed with result %d\n", 650 retval); 651 } 652 653 /* Interrupt function for older touchpads: GEYSER3/GEYSER4 */ 654 655 static void atp_complete_geyser_3_4(struct urb *urb) 656 { 657 int x, y, x_z, y_z, x_f, y_f; 658 int retval, i, j; 659 int key, fingers; 660 struct atp *dev = urb->context; 661 int status = atp_status_check(urb); 662 663 if (status == ATP_URB_STATUS_ERROR_FATAL) 664 return; 665 else if (status == ATP_URB_STATUS_ERROR) 666 goto exit; 667 668 /* Reorder the sensors values: 669 * 670 * The values are laid out like this: 671 * -, Y1, Y2, -, Y3, Y4, -, ..., -, X1, X2, -, X3, X4, ... 672 * '-' is an unused value. 673 */ 674 675 /* read X values */ 676 for (i = 0, j = 19; i < 20; i += 2, j += 3) { 677 dev->xy_cur[i] = dev->data[j + 1]; 678 dev->xy_cur[i + 1] = dev->data[j + 2]; 679 } 680 /* read Y values */ 681 for (i = 0, j = 1; i < 9; i += 2, j += 3) { 682 dev->xy_cur[ATP_XSENSORS + i] = dev->data[j + 1]; 683 dev->xy_cur[ATP_XSENSORS + i + 1] = dev->data[j + 2]; 684 } 685 686 dbg_dump("sample", dev->xy_cur); 687 688 /* Just update the base values (i.e. touchpad in untouched state) */ 689 if (dev->data[dev->info->datalen - 1] & ATP_STATUS_BASE_UPDATE) { 690 691 dprintk("appletouch: updated base values\n"); 692 693 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old)); 694 goto exit; 695 } 696 697 for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) { 698 /* calculate the change */ 699 dev->xy_acc[i] = dev->xy_cur[i] - dev->xy_old[i]; 700 701 /* this is a round-robin value, so couple with that */ 702 if (dev->xy_acc[i] > 127) 703 dev->xy_acc[i] -= 256; 704 705 if (dev->xy_acc[i] < -127) 706 dev->xy_acc[i] += 256; 707 708 /* prevent down drifting */ 709 if (dev->xy_acc[i] < 0) 710 dev->xy_acc[i] = 0; 711 } 712 713 dbg_dump("accumulator", dev->xy_acc); 714 715 x = atp_calculate_abs(dev, 0, ATP_XSENSORS, 716 dev->info->xfact, &x_z, &x_f); 717 y = atp_calculate_abs(dev, ATP_XSENSORS, ATP_YSENSORS, 718 dev->info->yfact, &y_z, &y_f); 719 720 key = dev->data[dev->info->datalen - 1] & ATP_STATUS_BUTTON; 721 722 fingers = max(x_f, y_f); 723 724 if (x && y && fingers == dev->fingers_old) { 725 if (dev->x_old != -1) { 726 x = (dev->x_old * 7 + x) >> 3; 727 y = (dev->y_old * 7 + y) >> 3; 728 dev->x_old = x; 729 dev->y_old = y; 730 731 if (debug > 1) 732 printk(KERN_DEBUG "appletouch: X: %3d Y: %3d " 733 "Xz: %3d Yz: %3d\n", 734 x, y, x_z, y_z); 735 736 input_report_key(dev->input, BTN_TOUCH, 1); 737 input_report_abs(dev->input, ABS_X, x); 738 input_report_abs(dev->input, ABS_Y, y); 739 input_report_abs(dev->input, ABS_PRESSURE, 740 min(ATP_PRESSURE, x_z + y_z)); 741 atp_report_fingers(dev->input, fingers); 742 } 743 dev->x_old = x; 744 dev->y_old = y; 745 746 } else if (!x && !y) { 747 748 dev->x_old = dev->y_old = -1; 749 dev->fingers_old = 0; 750 input_report_key(dev->input, BTN_TOUCH, 0); 751 input_report_abs(dev->input, ABS_PRESSURE, 0); 752 atp_report_fingers(dev->input, 0); 753 754 /* reset the accumulator on release */ 755 memset(dev->xy_acc, 0, sizeof(dev->xy_acc)); 756 } 757 758 if (fingers != dev->fingers_old) 759 dev->x_old = dev->y_old = -1; 760 dev->fingers_old = fingers; 761 762 input_report_key(dev->input, BTN_LEFT, key); 763 input_sync(dev->input); 764 765 /* 766 * Geysers 3/4 will continue to send packets continually after 767 * the first touch unless reinitialised. Do so if it's been 768 * idle for a while in order to avoid waking the kernel up 769 * several hundred times a second. 770 */ 771 772 /* 773 * Button must not be pressed when entering suspend, 774 * otherwise we will never release the button. 775 */ 776 if (!x && !y && !key) { 777 dev->idlecount++; 778 if (dev->idlecount == 10) { 779 dev->x_old = dev->y_old = -1; 780 dev->idlecount = 0; 781 schedule_work(&dev->work); 782 /* Don't resubmit urb here, wait for reinit */ 783 return; 784 } 785 } else 786 dev->idlecount = 0; 787 788 exit: 789 retval = usb_submit_urb(dev->urb, GFP_ATOMIC); 790 if (retval) 791 dev_err(&dev->intf->dev, 792 "atp_complete: usb_submit_urb failed with result %d\n", 793 retval); 794 } 795 796 static int atp_open(struct input_dev *input) 797 { 798 struct atp *dev = input_get_drvdata(input); 799 800 if (usb_submit_urb(dev->urb, GFP_KERNEL)) 801 return -EIO; 802 803 dev->open = true; 804 return 0; 805 } 806 807 static void atp_close(struct input_dev *input) 808 { 809 struct atp *dev = input_get_drvdata(input); 810 811 usb_kill_urb(dev->urb); 812 cancel_work_sync(&dev->work); 813 dev->open = false; 814 } 815 816 static int atp_handle_geyser(struct atp *dev) 817 { 818 if (dev->info != &fountain_info) { 819 /* switch to raw sensor mode */ 820 if (atp_geyser_init(dev)) 821 return -EIO; 822 823 dev_info(&dev->intf->dev, "Geyser mode initialized.\n"); 824 } 825 826 return 0; 827 } 828 829 static int atp_probe(struct usb_interface *iface, 830 const struct usb_device_id *id) 831 { 832 struct atp *dev; 833 struct input_dev *input_dev; 834 struct usb_device *udev = interface_to_usbdev(iface); 835 struct usb_host_interface *iface_desc; 836 struct usb_endpoint_descriptor *endpoint; 837 int int_in_endpointAddr = 0; 838 int i, error = -ENOMEM; 839 const struct atp_info *info = (const struct atp_info *)id->driver_info; 840 841 /* set up the endpoint information */ 842 /* use only the first interrupt-in endpoint */ 843 iface_desc = iface->cur_altsetting; 844 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) { 845 endpoint = &iface_desc->endpoint[i].desc; 846 if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) { 847 /* we found an interrupt in endpoint */ 848 int_in_endpointAddr = endpoint->bEndpointAddress; 849 break; 850 } 851 } 852 if (!int_in_endpointAddr) { 853 dev_err(&iface->dev, "Could not find int-in endpoint\n"); 854 return -EIO; 855 } 856 857 /* allocate memory for our device state and initialize it */ 858 dev = kzalloc(sizeof(struct atp), GFP_KERNEL); 859 input_dev = input_allocate_device(); 860 if (!dev || !input_dev) { 861 dev_err(&iface->dev, "Out of memory\n"); 862 goto err_free_devs; 863 } 864 865 dev->udev = udev; 866 dev->intf = iface; 867 dev->input = input_dev; 868 dev->info = info; 869 dev->overflow_warned = false; 870 871 dev->urb = usb_alloc_urb(0, GFP_KERNEL); 872 if (!dev->urb) 873 goto err_free_devs; 874 875 dev->data = usb_alloc_coherent(dev->udev, dev->info->datalen, GFP_KERNEL, 876 &dev->urb->transfer_dma); 877 if (!dev->data) 878 goto err_free_urb; 879 880 usb_fill_int_urb(dev->urb, udev, 881 usb_rcvintpipe(udev, int_in_endpointAddr), 882 dev->data, dev->info->datalen, 883 dev->info->callback, dev, 1); 884 885 error = atp_handle_geyser(dev); 886 if (error) 887 goto err_free_buffer; 888 889 usb_make_path(udev, dev->phys, sizeof(dev->phys)); 890 strlcat(dev->phys, "/input0", sizeof(dev->phys)); 891 892 input_dev->name = "appletouch"; 893 input_dev->phys = dev->phys; 894 usb_to_input_id(dev->udev, &input_dev->id); 895 input_dev->dev.parent = &iface->dev; 896 897 input_set_drvdata(input_dev, dev); 898 899 input_dev->open = atp_open; 900 input_dev->close = atp_close; 901 902 set_bit(EV_ABS, input_dev->evbit); 903 904 input_set_abs_params(input_dev, ABS_X, 0, 905 (dev->info->xsensors - 1) * dev->info->xfact - 1, 906 dev->info->fuzz, 0); 907 input_set_abs_params(input_dev, ABS_Y, 0, 908 (dev->info->ysensors - 1) * dev->info->yfact - 1, 909 dev->info->fuzz, 0); 910 input_set_abs_params(input_dev, ABS_PRESSURE, 0, ATP_PRESSURE, 0, 0); 911 912 set_bit(EV_KEY, input_dev->evbit); 913 set_bit(BTN_TOUCH, input_dev->keybit); 914 set_bit(BTN_TOOL_FINGER, input_dev->keybit); 915 set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit); 916 set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit); 917 set_bit(BTN_LEFT, input_dev->keybit); 918 919 INIT_WORK(&dev->work, atp_reinit); 920 921 error = input_register_device(dev->input); 922 if (error) 923 goto err_free_buffer; 924 925 /* save our data pointer in this interface device */ 926 usb_set_intfdata(iface, dev); 927 928 return 0; 929 930 err_free_buffer: 931 usb_free_coherent(dev->udev, dev->info->datalen, 932 dev->data, dev->urb->transfer_dma); 933 err_free_urb: 934 usb_free_urb(dev->urb); 935 err_free_devs: 936 usb_set_intfdata(iface, NULL); 937 kfree(dev); 938 input_free_device(input_dev); 939 return error; 940 } 941 942 static void atp_disconnect(struct usb_interface *iface) 943 { 944 struct atp *dev = usb_get_intfdata(iface); 945 946 usb_set_intfdata(iface, NULL); 947 if (dev) { 948 usb_kill_urb(dev->urb); 949 input_unregister_device(dev->input); 950 usb_free_coherent(dev->udev, dev->info->datalen, 951 dev->data, dev->urb->transfer_dma); 952 usb_free_urb(dev->urb); 953 kfree(dev); 954 } 955 dev_info(&iface->dev, "input: appletouch disconnected\n"); 956 } 957 958 static int atp_recover(struct atp *dev) 959 { 960 int error; 961 962 error = atp_handle_geyser(dev); 963 if (error) 964 return error; 965 966 if (dev->open && usb_submit_urb(dev->urb, GFP_KERNEL)) 967 return -EIO; 968 969 return 0; 970 } 971 972 static int atp_suspend(struct usb_interface *iface, pm_message_t message) 973 { 974 struct atp *dev = usb_get_intfdata(iface); 975 976 usb_kill_urb(dev->urb); 977 return 0; 978 } 979 980 static int atp_resume(struct usb_interface *iface) 981 { 982 struct atp *dev = usb_get_intfdata(iface); 983 984 if (dev->open && usb_submit_urb(dev->urb, GFP_KERNEL)) 985 return -EIO; 986 987 return 0; 988 } 989 990 static int atp_reset_resume(struct usb_interface *iface) 991 { 992 struct atp *dev = usb_get_intfdata(iface); 993 994 return atp_recover(dev); 995 } 996 997 static struct usb_driver atp_driver = { 998 .name = "appletouch", 999 .probe = atp_probe, 1000 .disconnect = atp_disconnect, 1001 .suspend = atp_suspend, 1002 .resume = atp_resume, 1003 .reset_resume = atp_reset_resume, 1004 .id_table = atp_table, 1005 }; 1006 1007 module_usb_driver(atp_driver); 1008