1/* 2 * Apple USB Touchpad (for post-February 2005 PowerBooks and MacBooks) driver 3 * 4 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com) 5 * Copyright (C) 2005-2008 Johannes Berg (johannes@sipsolutions.net) 6 * Copyright (C) 2005-2008 Stelian Pop (stelian@popies.net) 7 * Copyright (C) 2005 Frank Arnold (frank@scirocco-5v-turbo.de) 8 * Copyright (C) 2005 Peter Osterlund (petero2@telia.com) 9 * Copyright (C) 2005 Michael Hanselmann (linux-kernel@hansmi.ch) 10 * Copyright (C) 2006 Nicolas Boichat (nicolas@boichat.ch) 11 * Copyright (C) 2007-2008 Sven Anders (anders@anduras.de) 12 * 13 * Thanks to Alex Harper <basilisk@foobox.net> for his inputs. 14 * 15 * This program is free software; you can redistribute it and/or modify 16 * it under the terms of the GNU General Public License as published by 17 * the Free Software Foundation; either version 2 of the License, or 18 * (at your option) any later version. 19 * 20 * This program is distributed in the hope that it will be useful, 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 23 * GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 28 * 29 */ 30 31#include <linux/kernel.h> 32#include <linux/errno.h> 33#include <linux/slab.h> 34#include <linux/module.h> 35#include <linux/usb/input.h> 36 37/* 38 * Note: We try to keep the touchpad aspect ratio while still doing only 39 * simple arithmetics: 40 * 0 <= x <= (xsensors - 1) * xfact 41 * 0 <= y <= (ysensors - 1) * yfact 42 */ 43struct atp_info { 44 int xsensors; /* number of X sensors */ 45 int xsensors_17; /* 17" models have more sensors */ 46 int ysensors; /* number of Y sensors */ 47 int xfact; /* X multiplication factor */ 48 int yfact; /* Y multiplication factor */ 49 int datalen; /* size of USB transfers */ 50 void (*callback)(struct urb *); /* callback function */ 51 int fuzz; /* fuzz touchpad generates */ 52}; 53 54static void atp_complete_geyser_1_2(struct urb *urb); 55static void atp_complete_geyser_3_4(struct urb *urb); 56 57static const struct atp_info fountain_info = { 58 .xsensors = 16, 59 .xsensors_17 = 26, 60 .ysensors = 16, 61 .xfact = 64, 62 .yfact = 43, 63 .datalen = 81, 64 .callback = atp_complete_geyser_1_2, 65 .fuzz = 16, 66}; 67 68static const struct atp_info geyser1_info = { 69 .xsensors = 16, 70 .xsensors_17 = 26, 71 .ysensors = 16, 72 .xfact = 64, 73 .yfact = 43, 74 .datalen = 81, 75 .callback = atp_complete_geyser_1_2, 76 .fuzz = 16, 77}; 78 79static const struct atp_info geyser2_info = { 80 .xsensors = 15, 81 .xsensors_17 = 20, 82 .ysensors = 9, 83 .xfact = 64, 84 .yfact = 43, 85 .datalen = 64, 86 .callback = atp_complete_geyser_1_2, 87 .fuzz = 0, 88}; 89 90static const struct atp_info geyser3_info = { 91 .xsensors = 20, 92 .ysensors = 10, 93 .xfact = 64, 94 .yfact = 64, 95 .datalen = 64, 96 .callback = atp_complete_geyser_3_4, 97 .fuzz = 0, 98}; 99 100static const struct atp_info geyser4_info = { 101 .xsensors = 20, 102 .ysensors = 10, 103 .xfact = 64, 104 .yfact = 64, 105 .datalen = 64, 106 .callback = atp_complete_geyser_3_4, 107 .fuzz = 0, 108}; 109 110#define ATP_DEVICE(prod, info) \ 111{ \ 112 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ 113 USB_DEVICE_ID_MATCH_INT_CLASS | \ 114 USB_DEVICE_ID_MATCH_INT_PROTOCOL, \ 115 .idVendor = 0x05ac, /* Apple */ \ 116 .idProduct = (prod), \ 117 .bInterfaceClass = 0x03, \ 118 .bInterfaceProtocol = 0x02, \ 119 .driver_info = (unsigned long) &info, \ 120} 121 122/* 123 * Table of devices (Product IDs) that work with this driver. 124 * (The names come from Info.plist in AppleUSBTrackpad.kext, 125 * According to Info.plist Geyser IV is the same as Geyser III.) 126 */ 127 128static struct usb_device_id atp_table[] = { 129 /* PowerBooks Feb 2005, iBooks G4 */ 130 ATP_DEVICE(0x020e, fountain_info), /* FOUNTAIN ANSI */ 131 ATP_DEVICE(0x020f, fountain_info), /* FOUNTAIN ISO */ 132 ATP_DEVICE(0x030a, fountain_info), /* FOUNTAIN TP ONLY */ 133 ATP_DEVICE(0x030b, geyser1_info), /* GEYSER 1 TP ONLY */ 134 135 /* PowerBooks Oct 2005 */ 136 ATP_DEVICE(0x0214, geyser2_info), /* GEYSER 2 ANSI */ 137 ATP_DEVICE(0x0215, geyser2_info), /* GEYSER 2 ISO */ 138 ATP_DEVICE(0x0216, geyser2_info), /* GEYSER 2 JIS */ 139 140 /* Core Duo MacBook & MacBook Pro */ 141 ATP_DEVICE(0x0217, geyser3_info), /* GEYSER 3 ANSI */ 142 ATP_DEVICE(0x0218, geyser3_info), /* GEYSER 3 ISO */ 143 ATP_DEVICE(0x0219, geyser3_info), /* GEYSER 3 JIS */ 144 145 /* Core2 Duo MacBook & MacBook Pro */ 146 ATP_DEVICE(0x021a, geyser4_info), /* GEYSER 4 ANSI */ 147 ATP_DEVICE(0x021b, geyser4_info), /* GEYSER 4 ISO */ 148 ATP_DEVICE(0x021c, geyser4_info), /* GEYSER 4 JIS */ 149 150 /* Core2 Duo MacBook3,1 */ 151 ATP_DEVICE(0x0229, geyser4_info), /* GEYSER 4 HF ANSI */ 152 ATP_DEVICE(0x022a, geyser4_info), /* GEYSER 4 HF ISO */ 153 ATP_DEVICE(0x022b, geyser4_info), /* GEYSER 4 HF JIS */ 154 155 /* Terminating entry */ 156 { } 157}; 158MODULE_DEVICE_TABLE(usb, atp_table); 159 160/* maximum number of sensors */ 161#define ATP_XSENSORS 26 162#define ATP_YSENSORS 16 163 164/* 165 * The largest possible bank of sensors with additional buffer of 4 extra values 166 * on either side, for an array of smoothed sensor values. 167 */ 168#define ATP_SMOOTHSIZE 34 169 170/* maximum pressure this driver will report */ 171#define ATP_PRESSURE 300 172 173/* 174 * Threshold for the touchpad sensors. Any change less than ATP_THRESHOLD is 175 * ignored. 176 */ 177#define ATP_THRESHOLD 5 178 179/* 180 * How far we'll bitshift our sensor values before averaging them. Mitigates 181 * rounding errors. 182 */ 183#define ATP_SCALE 12 184 185/* Geyser initialization constants */ 186#define ATP_GEYSER_MODE_READ_REQUEST_ID 1 187#define ATP_GEYSER_MODE_WRITE_REQUEST_ID 9 188#define ATP_GEYSER_MODE_REQUEST_VALUE 0x300 189#define ATP_GEYSER_MODE_REQUEST_INDEX 0 190#define ATP_GEYSER_MODE_VENDOR_VALUE 0x04 191 192/** 193 * enum atp_status_bits - status bit meanings 194 * 195 * These constants represent the meaning of the status bits. 196 * (only Geyser 3/4) 197 * 198 * @ATP_STATUS_BUTTON: The button was pressed 199 * @ATP_STATUS_BASE_UPDATE: Update of the base values (untouched pad) 200 * @ATP_STATUS_FROM_RESET: Reset previously performed 201 */ 202enum atp_status_bits { 203 ATP_STATUS_BUTTON = BIT(0), 204 ATP_STATUS_BASE_UPDATE = BIT(2), 205 ATP_STATUS_FROM_RESET = BIT(4), 206}; 207 208/* Structure to hold all of our device specific stuff */ 209struct atp { 210 char phys[64]; 211 struct usb_device *udev; /* usb device */ 212 struct usb_interface *intf; /* usb interface */ 213 struct urb *urb; /* usb request block */ 214 u8 *data; /* transferred data */ 215 struct input_dev *input; /* input dev */ 216 const struct atp_info *info; /* touchpad model */ 217 bool open; 218 bool valid; /* are the samples valid? */ 219 bool size_detect_done; 220 bool overflow_warned; 221 int fingers_old; /* last reported finger count */ 222 int x_old; /* last reported x/y, */ 223 int y_old; /* used for smoothing */ 224 signed char xy_cur[ATP_XSENSORS + ATP_YSENSORS]; 225 signed char xy_old[ATP_XSENSORS + ATP_YSENSORS]; 226 int xy_acc[ATP_XSENSORS + ATP_YSENSORS]; 227 int smooth[ATP_SMOOTHSIZE]; 228 int smooth_tmp[ATP_SMOOTHSIZE]; 229 int idlecount; /* number of empty packets */ 230 struct work_struct work; 231}; 232 233#define dbg_dump(msg, tab) \ 234 if (debug > 1) { \ 235 int __i; \ 236 printk(KERN_DEBUG "appletouch: %s", msg); \ 237 for (__i = 0; __i < ATP_XSENSORS + ATP_YSENSORS; __i++) \ 238 printk(" %02x", tab[__i]); \ 239 printk("\n"); \ 240 } 241 242#define dprintk(format, a...) \ 243 do { \ 244 if (debug) \ 245 printk(KERN_DEBUG format, ##a); \ 246 } while (0) 247 248MODULE_AUTHOR("Johannes Berg"); 249MODULE_AUTHOR("Stelian Pop"); 250MODULE_AUTHOR("Frank Arnold"); 251MODULE_AUTHOR("Michael Hanselmann"); 252MODULE_AUTHOR("Sven Anders"); 253MODULE_DESCRIPTION("Apple PowerBook and MacBook USB touchpad driver"); 254MODULE_LICENSE("GPL"); 255 256/* 257 * Make the threshold a module parameter 258 */ 259static int threshold = ATP_THRESHOLD; 260module_param(threshold, int, 0644); 261MODULE_PARM_DESC(threshold, "Discard any change in data from a sensor" 262 " (the trackpad has many of these sensors)" 263 " less than this value."); 264 265static int debug; 266module_param(debug, int, 0644); 267MODULE_PARM_DESC(debug, "Activate debugging output"); 268 269/* 270 * By default newer Geyser devices send standard USB HID mouse 271 * packets (Report ID 2). This code changes device mode, so it 272 * sends raw sensor reports (Report ID 5). 273 */ 274static int atp_geyser_init(struct atp *dev) 275{ 276 struct usb_device *udev = dev->udev; 277 char *data; 278 int size; 279 int i; 280 int ret; 281 282 data = kmalloc(8, GFP_KERNEL); 283 if (!data) { 284 dev_err(&dev->intf->dev, "Out of memory\n"); 285 return -ENOMEM; 286 } 287 288 size = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 289 ATP_GEYSER_MODE_READ_REQUEST_ID, 290 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 291 ATP_GEYSER_MODE_REQUEST_VALUE, 292 ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000); 293 294 if (size != 8) { 295 dprintk("atp_geyser_init: read error\n"); 296 for (i = 0; i < 8; i++) 297 dprintk("appletouch[%d]: %d\n", i, data[i]); 298 299 dev_err(&dev->intf->dev, "Failed to read mode from device.\n"); 300 ret = -EIO; 301 goto out_free; 302 } 303 304 /* Apply the mode switch */ 305 data[0] = ATP_GEYSER_MODE_VENDOR_VALUE; 306 307 size = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 308 ATP_GEYSER_MODE_WRITE_REQUEST_ID, 309 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 310 ATP_GEYSER_MODE_REQUEST_VALUE, 311 ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000); 312 313 if (size != 8) { 314 dprintk("atp_geyser_init: write error\n"); 315 for (i = 0; i < 8; i++) 316 dprintk("appletouch[%d]: %d\n", i, data[i]); 317 318 dev_err(&dev->intf->dev, "Failed to request geyser raw mode\n"); 319 ret = -EIO; 320 goto out_free; 321 } 322 ret = 0; 323out_free: 324 kfree(data); 325 return ret; 326} 327 328/* 329 * Reinitialise the device. This usually stops stream of empty packets 330 * coming from it. 331 */ 332static void atp_reinit(struct work_struct *work) 333{ 334 struct atp *dev = container_of(work, struct atp, work); 335 int retval; 336 337 dprintk("appletouch: putting appletouch to sleep (reinit)\n"); 338 atp_geyser_init(dev); 339 340 retval = usb_submit_urb(dev->urb, GFP_ATOMIC); 341 if (retval) 342 dev_err(&dev->intf->dev, 343 "atp_reinit: usb_submit_urb failed with error %d\n", 344 retval); 345} 346 347static int atp_calculate_abs(struct atp *dev, int offset, int nb_sensors, 348 int fact, int *z, int *fingers) 349{ 350 int i, pass; 351 352 /* 353 * Use offset to point xy_sensors at the first value in dev->xy_acc 354 * for whichever dimension we're looking at this particular go-round. 355 */ 356 int *xy_sensors = dev->xy_acc + offset; 357 358 /* values to calculate mean */ 359 int pcum = 0, psum = 0; 360 int is_increasing = 0; 361 362 *fingers = 0; 363 364 for (i = 0; i < nb_sensors; i++) { 365 if (xy_sensors[i] < threshold) { 366 if (is_increasing) 367 is_increasing = 0; 368 369 /* 370 * Makes the finger detection more versatile. For example, 371 * two fingers with no gap will be detected. Also, my 372 * tests show it less likely to have intermittent loss 373 * of multiple finger readings while moving around (scrolling). 374 * 375 * Changes the multiple finger detection to counting humps on 376 * sensors (transitions from nonincreasing to increasing) 377 * instead of counting transitions from low sensors (no 378 * finger reading) to high sensors (finger above 379 * sensor) 380 * 381 * - Jason Parekh <jasonparekh@gmail.com> 382 */ 383 384 } else if (i < 1 || 385 (!is_increasing && xy_sensors[i - 1] < xy_sensors[i])) { 386 (*fingers)++; 387 is_increasing = 1; 388 } else if (i > 0 && (xy_sensors[i - 1] - xy_sensors[i] > threshold)) { 389 is_increasing = 0; 390 } 391 } 392 393 if (*fingers < 1) /* No need to continue if no fingers are found. */ 394 return 0; 395 396 /* 397 * Use a smoothed version of sensor data for movement calculations, to 398 * combat noise without needing to rely so heavily on a threshold. 399 * This improves tracking. 400 * 401 * The smoothed array is bigger than the original so that the smoothing 402 * doesn't result in edge values being truncated. 403 */ 404 405 memset(dev->smooth, 0, 4 * sizeof(dev->smooth[0])); 406 /* Pull base values, scaled up to help avoid truncation errors. */ 407 for (i = 0; i < nb_sensors; i++) 408 dev->smooth[i + 4] = xy_sensors[i] << ATP_SCALE; 409 memset(&dev->smooth[nb_sensors + 4], 0, 4 * sizeof(dev->smooth[0])); 410 411 for (pass = 0; pass < 4; pass++) { 412 /* Handle edge. */ 413 dev->smooth_tmp[0] = (dev->smooth[0] + dev->smooth[1]) / 2; 414 415 /* Average values with neighbors. */ 416 for (i = 1; i < nb_sensors + 7; i++) 417 dev->smooth_tmp[i] = (dev->smooth[i - 1] + 418 dev->smooth[i] * 2 + 419 dev->smooth[i + 1]) / 4; 420 421 /* Handle other edge. */ 422 dev->smooth_tmp[i] = (dev->smooth[i - 1] + dev->smooth[i]) / 2; 423 424 memcpy(dev->smooth, dev->smooth_tmp, sizeof(dev->smooth)); 425 } 426 427 for (i = 0; i < nb_sensors + 8; i++) { 428 /* 429 * Skip values if they're small enough to be truncated to 0 430 * by scale. Mostly noise. 431 */ 432 if ((dev->smooth[i] >> ATP_SCALE) > 0) { 433 pcum += dev->smooth[i] * i; 434 psum += dev->smooth[i]; 435 } 436 } 437 438 if (psum > 0) { 439 *z = psum >> ATP_SCALE; /* Scale down pressure output. */ 440 return pcum * fact / psum; 441 } 442 443 return 0; 444} 445 446static inline void atp_report_fingers(struct input_dev *input, int fingers) 447{ 448 input_report_key(input, BTN_TOOL_FINGER, fingers == 1); 449 input_report_key(input, BTN_TOOL_DOUBLETAP, fingers == 2); 450 input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2); 451} 452 453/* Check URB status and for correct length of data package */ 454 455#define ATP_URB_STATUS_SUCCESS 0 456#define ATP_URB_STATUS_ERROR 1 457#define ATP_URB_STATUS_ERROR_FATAL 2 458 459static int atp_status_check(struct urb *urb) 460{ 461 struct atp *dev = urb->context; 462 struct usb_interface *intf = dev->intf; 463 464 switch (urb->status) { 465 case 0: 466 /* success */ 467 break; 468 case -EOVERFLOW: 469 if (!dev->overflow_warned) { 470 dev_warn(&intf->dev, 471 "appletouch: OVERFLOW with data length %d, actual length is %d\n", 472 dev->info->datalen, dev->urb->actual_length); 473 dev->overflow_warned = true; 474 } 475 case -ECONNRESET: 476 case -ENOENT: 477 case -ESHUTDOWN: 478 /* This urb is terminated, clean up */ 479 dev_dbg(&intf->dev, 480 "atp_complete: urb shutting down with status: %d\n", 481 urb->status); 482 return ATP_URB_STATUS_ERROR_FATAL; 483 484 default: 485 dev_dbg(&intf->dev, 486 "atp_complete: nonzero urb status received: %d\n", 487 urb->status); 488 return ATP_URB_STATUS_ERROR; 489 } 490 491 /* drop incomplete datasets */ 492 if (dev->urb->actual_length != dev->info->datalen) { 493 dprintk("appletouch: incomplete data package" 494 " (first byte: %d, length: %d).\n", 495 dev->data[0], dev->urb->actual_length); 496 return ATP_URB_STATUS_ERROR; 497 } 498 499 return ATP_URB_STATUS_SUCCESS; 500} 501 502static void atp_detect_size(struct atp *dev) 503{ 504 int i; 505 506 /* 17" Powerbooks have extra X sensors */ 507 for (i = dev->info->xsensors; i < ATP_XSENSORS; i++) { 508 if (dev->xy_cur[i]) { 509 510 dev_info(&dev->intf->dev, 511 "appletouch: 17\" model detected.\n"); 512 513 input_set_abs_params(dev->input, ABS_X, 0, 514 (dev->info->xsensors_17 - 1) * 515 dev->info->xfact - 1, 516 dev->info->fuzz, 0); 517 break; 518 } 519 } 520} 521 522/* 523 * USB interrupt callback functions 524 */ 525 526/* Interrupt function for older touchpads: FOUNTAIN/GEYSER1/GEYSER2 */ 527 528static void atp_complete_geyser_1_2(struct urb *urb) 529{ 530 int x, y, x_z, y_z, x_f, y_f; 531 int retval, i, j; 532 int key, fingers; 533 struct atp *dev = urb->context; 534 int status = atp_status_check(urb); 535 536 if (status == ATP_URB_STATUS_ERROR_FATAL) 537 return; 538 else if (status == ATP_URB_STATUS_ERROR) 539 goto exit; 540 541 /* reorder the sensors values */ 542 if (dev->info == &geyser2_info) { 543 memset(dev->xy_cur, 0, sizeof(dev->xy_cur)); 544 545 /* 546 * The values are laid out like this: 547 * Y1, Y2, -, Y3, Y4, -, ..., X1, X2, -, X3, X4, -, ... 548 * '-' is an unused value. 549 */ 550 551 /* read X values */ 552 for (i = 0, j = 19; i < 20; i += 2, j += 3) { 553 dev->xy_cur[i] = dev->data[j]; 554 dev->xy_cur[i + 1] = dev->data[j + 1]; 555 } 556 557 /* read Y values */ 558 for (i = 0, j = 1; i < 9; i += 2, j += 3) { 559 dev->xy_cur[ATP_XSENSORS + i] = dev->data[j]; 560 dev->xy_cur[ATP_XSENSORS + i + 1] = dev->data[j + 1]; 561 } 562 } else { 563 for (i = 0; i < 8; i++) { 564 /* X values */ 565 dev->xy_cur[i + 0] = dev->data[5 * i + 2]; 566 dev->xy_cur[i + 8] = dev->data[5 * i + 4]; 567 dev->xy_cur[i + 16] = dev->data[5 * i + 42]; 568 if (i < 2) 569 dev->xy_cur[i + 24] = dev->data[5 * i + 44]; 570 571 /* Y values */ 572 dev->xy_cur[ATP_XSENSORS + i] = dev->data[5 * i + 1]; 573 dev->xy_cur[ATP_XSENSORS + i + 8] = dev->data[5 * i + 3]; 574 } 575 } 576 577 dbg_dump("sample", dev->xy_cur); 578 579 if (!dev->valid) { 580 /* first sample */ 581 dev->valid = true; 582 dev->x_old = dev->y_old = -1; 583 584 /* Store first sample */ 585 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old)); 586 587 /* Perform size detection, if not done already */ 588 if (unlikely(!dev->size_detect_done)) { 589 atp_detect_size(dev); 590 dev->size_detect_done = 1; 591 goto exit; 592 } 593 } 594 595 for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) { 596 /* accumulate the change */ 597 signed char change = dev->xy_old[i] - dev->xy_cur[i]; 598 dev->xy_acc[i] -= change; 599 600 /* prevent down drifting */ 601 if (dev->xy_acc[i] < 0) 602 dev->xy_acc[i] = 0; 603 } 604 605 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old)); 606 607 dbg_dump("accumulator", dev->xy_acc); 608 609 x = atp_calculate_abs(dev, 0, ATP_XSENSORS, 610 dev->info->xfact, &x_z, &x_f); 611 y = atp_calculate_abs(dev, ATP_XSENSORS, ATP_YSENSORS, 612 dev->info->yfact, &y_z, &y_f); 613 key = dev->data[dev->info->datalen - 1] & ATP_STATUS_BUTTON; 614 615 fingers = max(x_f, y_f); 616 617 if (x && y && fingers == dev->fingers_old) { 618 if (dev->x_old != -1) { 619 x = (dev->x_old * 7 + x) >> 3; 620 y = (dev->y_old * 7 + y) >> 3; 621 dev->x_old = x; 622 dev->y_old = y; 623 624 if (debug > 1) 625 printk(KERN_DEBUG "appletouch: " 626 "X: %3d Y: %3d Xz: %3d Yz: %3d\n", 627 x, y, x_z, y_z); 628 629 input_report_key(dev->input, BTN_TOUCH, 1); 630 input_report_abs(dev->input, ABS_X, x); 631 input_report_abs(dev->input, ABS_Y, y); 632 input_report_abs(dev->input, ABS_PRESSURE, 633 min(ATP_PRESSURE, x_z + y_z)); 634 atp_report_fingers(dev->input, fingers); 635 } 636 dev->x_old = x; 637 dev->y_old = y; 638 639 } else if (!x && !y) { 640 641 dev->x_old = dev->y_old = -1; 642 dev->fingers_old = 0; 643 input_report_key(dev->input, BTN_TOUCH, 0); 644 input_report_abs(dev->input, ABS_PRESSURE, 0); 645 atp_report_fingers(dev->input, 0); 646 647 /* reset the accumulator on release */ 648 memset(dev->xy_acc, 0, sizeof(dev->xy_acc)); 649 } 650 651 if (fingers != dev->fingers_old) 652 dev->x_old = dev->y_old = -1; 653 dev->fingers_old = fingers; 654 655 input_report_key(dev->input, BTN_LEFT, key); 656 input_sync(dev->input); 657 658 exit: 659 retval = usb_submit_urb(dev->urb, GFP_ATOMIC); 660 if (retval) 661 dev_err(&dev->intf->dev, 662 "atp_complete: usb_submit_urb failed with result %d\n", 663 retval); 664} 665 666/* Interrupt function for older touchpads: GEYSER3/GEYSER4 */ 667 668static void atp_complete_geyser_3_4(struct urb *urb) 669{ 670 int x, y, x_z, y_z, x_f, y_f; 671 int retval, i, j; 672 int key, fingers; 673 struct atp *dev = urb->context; 674 int status = atp_status_check(urb); 675 676 if (status == ATP_URB_STATUS_ERROR_FATAL) 677 return; 678 else if (status == ATP_URB_STATUS_ERROR) 679 goto exit; 680 681 /* Reorder the sensors values: 682 * 683 * The values are laid out like this: 684 * -, Y1, Y2, -, Y3, Y4, -, ..., -, X1, X2, -, X3, X4, ... 685 * '-' is an unused value. 686 */ 687 688 /* read X values */ 689 for (i = 0, j = 19; i < 20; i += 2, j += 3) { 690 dev->xy_cur[i] = dev->data[j + 1]; 691 dev->xy_cur[i + 1] = dev->data[j + 2]; 692 } 693 /* read Y values */ 694 for (i = 0, j = 1; i < 9; i += 2, j += 3) { 695 dev->xy_cur[ATP_XSENSORS + i] = dev->data[j + 1]; 696 dev->xy_cur[ATP_XSENSORS + i + 1] = dev->data[j + 2]; 697 } 698 699 dbg_dump("sample", dev->xy_cur); 700 701 /* Just update the base values (i.e. touchpad in untouched state) */ 702 if (dev->data[dev->info->datalen - 1] & ATP_STATUS_BASE_UPDATE) { 703 704 dprintk("appletouch: updated base values\n"); 705 706 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old)); 707 goto exit; 708 } 709 710 for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) { 711 /* calculate the change */ 712 dev->xy_acc[i] = dev->xy_cur[i] - dev->xy_old[i]; 713 714 /* this is a round-robin value, so couple with that */ 715 if (dev->xy_acc[i] > 127) 716 dev->xy_acc[i] -= 256; 717 718 if (dev->xy_acc[i] < -127) 719 dev->xy_acc[i] += 256; 720 721 /* prevent down drifting */ 722 if (dev->xy_acc[i] < 0) 723 dev->xy_acc[i] = 0; 724 } 725 726 dbg_dump("accumulator", dev->xy_acc); 727 728 x = atp_calculate_abs(dev, 0, ATP_XSENSORS, 729 dev->info->xfact, &x_z, &x_f); 730 y = atp_calculate_abs(dev, ATP_XSENSORS, ATP_YSENSORS, 731 dev->info->yfact, &y_z, &y_f); 732 733 key = dev->data[dev->info->datalen - 1] & ATP_STATUS_BUTTON; 734 735 fingers = max(x_f, y_f); 736 737 if (x && y && fingers == dev->fingers_old) { 738 if (dev->x_old != -1) { 739 x = (dev->x_old * 7 + x) >> 3; 740 y = (dev->y_old * 7 + y) >> 3; 741 dev->x_old = x; 742 dev->y_old = y; 743 744 if (debug > 1) 745 printk(KERN_DEBUG "appletouch: X: %3d Y: %3d " 746 "Xz: %3d Yz: %3d\n", 747 x, y, x_z, y_z); 748 749 input_report_key(dev->input, BTN_TOUCH, 1); 750 input_report_abs(dev->input, ABS_X, x); 751 input_report_abs(dev->input, ABS_Y, y); 752 input_report_abs(dev->input, ABS_PRESSURE, 753 min(ATP_PRESSURE, x_z + y_z)); 754 atp_report_fingers(dev->input, fingers); 755 } 756 dev->x_old = x; 757 dev->y_old = y; 758 759 } else if (!x && !y) { 760 761 dev->x_old = dev->y_old = -1; 762 dev->fingers_old = 0; 763 input_report_key(dev->input, BTN_TOUCH, 0); 764 input_report_abs(dev->input, ABS_PRESSURE, 0); 765 atp_report_fingers(dev->input, 0); 766 767 /* reset the accumulator on release */ 768 memset(dev->xy_acc, 0, sizeof(dev->xy_acc)); 769 } 770 771 if (fingers != dev->fingers_old) 772 dev->x_old = dev->y_old = -1; 773 dev->fingers_old = fingers; 774 775 input_report_key(dev->input, BTN_LEFT, key); 776 input_sync(dev->input); 777 778 /* 779 * Geysers 3/4 will continue to send packets continually after 780 * the first touch unless reinitialised. Do so if it's been 781 * idle for a while in order to avoid waking the kernel up 782 * several hundred times a second. 783 */ 784 785 /* 786 * Button must not be pressed when entering suspend, 787 * otherwise we will never release the button. 788 */ 789 if (!x && !y && !key) { 790 dev->idlecount++; 791 if (dev->idlecount == 10) { 792 dev->x_old = dev->y_old = -1; 793 dev->idlecount = 0; 794 schedule_work(&dev->work); 795 /* Don't resubmit urb here, wait for reinit */ 796 return; 797 } 798 } else 799 dev->idlecount = 0; 800 801 exit: 802 retval = usb_submit_urb(dev->urb, GFP_ATOMIC); 803 if (retval) 804 dev_err(&dev->intf->dev, 805 "atp_complete: usb_submit_urb failed with result %d\n", 806 retval); 807} 808 809static int atp_open(struct input_dev *input) 810{ 811 struct atp *dev = input_get_drvdata(input); 812 813 if (usb_submit_urb(dev->urb, GFP_ATOMIC)) 814 return -EIO; 815 816 dev->open = 1; 817 return 0; 818} 819 820static void atp_close(struct input_dev *input) 821{ 822 struct atp *dev = input_get_drvdata(input); 823 824 usb_kill_urb(dev->urb); 825 cancel_work_sync(&dev->work); 826 dev->open = 0; 827} 828 829static int atp_handle_geyser(struct atp *dev) 830{ 831 if (dev->info != &fountain_info) { 832 /* switch to raw sensor mode */ 833 if (atp_geyser_init(dev)) 834 return -EIO; 835 836 dev_info(&dev->intf->dev, "Geyser mode initialized.\n"); 837 } 838 839 return 0; 840} 841 842static int atp_probe(struct usb_interface *iface, 843 const struct usb_device_id *id) 844{ 845 struct atp *dev; 846 struct input_dev *input_dev; 847 struct usb_device *udev = interface_to_usbdev(iface); 848 struct usb_host_interface *iface_desc; 849 struct usb_endpoint_descriptor *endpoint; 850 int int_in_endpointAddr = 0; 851 int i, error = -ENOMEM; 852 const struct atp_info *info = (const struct atp_info *)id->driver_info; 853 854 /* set up the endpoint information */ 855 /* use only the first interrupt-in endpoint */ 856 iface_desc = iface->cur_altsetting; 857 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) { 858 endpoint = &iface_desc->endpoint[i].desc; 859 if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) { 860 /* we found an interrupt in endpoint */ 861 int_in_endpointAddr = endpoint->bEndpointAddress; 862 break; 863 } 864 } 865 if (!int_in_endpointAddr) { 866 dev_err(&iface->dev, "Could not find int-in endpoint\n"); 867 return -EIO; 868 } 869 870 /* allocate memory for our device state and initialize it */ 871 dev = kzalloc(sizeof(struct atp), GFP_KERNEL); 872 input_dev = input_allocate_device(); 873 if (!dev || !input_dev) { 874 dev_err(&iface->dev, "Out of memory\n"); 875 goto err_free_devs; 876 } 877 878 dev->udev = udev; 879 dev->intf = iface; 880 dev->input = input_dev; 881 dev->info = info; 882 dev->overflow_warned = false; 883 884 dev->urb = usb_alloc_urb(0, GFP_KERNEL); 885 if (!dev->urb) 886 goto err_free_devs; 887 888 dev->data = usb_alloc_coherent(dev->udev, dev->info->datalen, GFP_KERNEL, 889 &dev->urb->transfer_dma); 890 if (!dev->data) 891 goto err_free_urb; 892 893 usb_fill_int_urb(dev->urb, udev, 894 usb_rcvintpipe(udev, int_in_endpointAddr), 895 dev->data, dev->info->datalen, 896 dev->info->callback, dev, 1); 897 898 error = atp_handle_geyser(dev); 899 if (error) 900 goto err_free_buffer; 901 902 usb_make_path(udev, dev->phys, sizeof(dev->phys)); 903 strlcat(dev->phys, "/input0", sizeof(dev->phys)); 904 905 input_dev->name = "appletouch"; 906 input_dev->phys = dev->phys; 907 usb_to_input_id(dev->udev, &input_dev->id); 908 input_dev->dev.parent = &iface->dev; 909 910 input_set_drvdata(input_dev, dev); 911 912 input_dev->open = atp_open; 913 input_dev->close = atp_close; 914 915 set_bit(EV_ABS, input_dev->evbit); 916 917 input_set_abs_params(input_dev, ABS_X, 0, 918 (dev->info->xsensors - 1) * dev->info->xfact - 1, 919 dev->info->fuzz, 0); 920 input_set_abs_params(input_dev, ABS_Y, 0, 921 (dev->info->ysensors - 1) * dev->info->yfact - 1, 922 dev->info->fuzz, 0); 923 input_set_abs_params(input_dev, ABS_PRESSURE, 0, ATP_PRESSURE, 0, 0); 924 925 set_bit(EV_KEY, input_dev->evbit); 926 set_bit(BTN_TOUCH, input_dev->keybit); 927 set_bit(BTN_TOOL_FINGER, input_dev->keybit); 928 set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit); 929 set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit); 930 set_bit(BTN_LEFT, input_dev->keybit); 931 932 error = input_register_device(dev->input); 933 if (error) 934 goto err_free_buffer; 935 936 /* save our data pointer in this interface device */ 937 usb_set_intfdata(iface, dev); 938 939 INIT_WORK(&dev->work, atp_reinit); 940 941 return 0; 942 943 err_free_buffer: 944 usb_free_coherent(dev->udev, dev->info->datalen, 945 dev->data, dev->urb->transfer_dma); 946 err_free_urb: 947 usb_free_urb(dev->urb); 948 err_free_devs: 949 usb_set_intfdata(iface, NULL); 950 kfree(dev); 951 input_free_device(input_dev); 952 return error; 953} 954 955static void atp_disconnect(struct usb_interface *iface) 956{ 957 struct atp *dev = usb_get_intfdata(iface); 958 959 usb_set_intfdata(iface, NULL); 960 if (dev) { 961 usb_kill_urb(dev->urb); 962 input_unregister_device(dev->input); 963 usb_free_coherent(dev->udev, dev->info->datalen, 964 dev->data, dev->urb->transfer_dma); 965 usb_free_urb(dev->urb); 966 kfree(dev); 967 } 968 dev_info(&iface->dev, "input: appletouch disconnected\n"); 969} 970 971static int atp_recover(struct atp *dev) 972{ 973 int error; 974 975 error = atp_handle_geyser(dev); 976 if (error) 977 return error; 978 979 if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC)) 980 return -EIO; 981 982 return 0; 983} 984 985static int atp_suspend(struct usb_interface *iface, pm_message_t message) 986{ 987 struct atp *dev = usb_get_intfdata(iface); 988 989 usb_kill_urb(dev->urb); 990 return 0; 991} 992 993static int atp_resume(struct usb_interface *iface) 994{ 995 struct atp *dev = usb_get_intfdata(iface); 996 997 if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC)) 998 return -EIO; 999 1000 return 0; 1001} 1002 1003static int atp_reset_resume(struct usb_interface *iface) 1004{ 1005 struct atp *dev = usb_get_intfdata(iface); 1006 1007 return atp_recover(dev); 1008} 1009 1010static struct usb_driver atp_driver = { 1011 .name = "appletouch", 1012 .probe = atp_probe, 1013 .disconnect = atp_disconnect, 1014 .suspend = atp_suspend, 1015 .resume = atp_resume, 1016 .reset_resume = atp_reset_resume, 1017 .id_table = atp_table, 1018}; 1019 1020module_usb_driver(atp_driver); 1021