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