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uwb: Use kcalloc instead of kzalloc to allocate array
[zen-stable.git] / drivers / input / mouse / appletouch.c
blobb77f9991278e791557e47638ce078b157cf52993
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/init.h>
34 #include <linux/slab.h>
35 #include <linux/module.h>
36 #include <linux/usb/input.h>
37
38 /*
39 * Note: We try to keep the touchpad aspect ratio while still doing only
40 * simple arithmetics:
41 * 0 <= x <= (xsensors - 1) * xfact
42 * 0 <= y <= (ysensors - 1) * yfact
43 */
44 struct atp_info {
45 int xsensors; /* number of X sensors */
46 int xsensors_17; /* 17" models have more sensors */
47 int ysensors; /* number of Y sensors */
48 int xfact; /* X multiplication factor */
49 int yfact; /* Y multiplication factor */
50 int datalen; /* size of USB transfers */
51 void (*callback)(struct urb *); /* callback function */
52 };
53
54 static void atp_complete_geyser_1_2(struct urb *urb);
55 static void atp_complete_geyser_3_4(struct urb *urb);
56
57 static 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 };
66
67 static const struct atp_info geyser1_info = {
68 .xsensors = 16,
69 .xsensors_17 = 26,
70 .ysensors = 16,
71 .xfact = 64,
72 .yfact = 43,
73 .datalen = 81,
74 .callback = atp_complete_geyser_1_2,
75 };
76
77 static const struct atp_info geyser2_info = {
78 .xsensors = 15,
79 .xsensors_17 = 20,
80 .ysensors = 9,
81 .xfact = 64,
82 .yfact = 43,
83 .datalen = 64,
84 .callback = atp_complete_geyser_1_2,
85 };
86
87 static const struct atp_info geyser3_info = {
88 .xsensors = 20,
89 .ysensors = 10,
90 .xfact = 64,
91 .yfact = 64,
92 .datalen = 64,
93 .callback = atp_complete_geyser_3_4,
94 };
95
96 static const struct atp_info geyser4_info = {
97 .xsensors = 20,
98 .ysensors = 10,
99 .xfact = 64,
100 .yfact = 64,
101 .datalen = 64,
102 .callback = atp_complete_geyser_3_4,
103 };
104
105 #define ATP_DEVICE(prod, info) \
106 { \
107 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
108 USB_DEVICE_ID_MATCH_INT_CLASS | \
109 USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
110 .idVendor = 0x05ac, /* Apple */ \
111 .idProduct = (prod), \
112 .bInterfaceClass = 0x03, \
113 .bInterfaceProtocol = 0x02, \
114 .driver_info = (unsigned long) &info, \
115 }
116
117 /*
118 * Table of devices (Product IDs) that work with this driver.
119 * (The names come from Info.plist in AppleUSBTrackpad.kext,
120 * According to Info.plist Geyser IV is the same as Geyser III.)
121 */
122
123 static struct usb_device_id atp_table[] = {
124 /* PowerBooks Feb 2005, iBooks G4 */
125 ATP_DEVICE(0x020e, fountain_info), /* FOUNTAIN ANSI */
126 ATP_DEVICE(0x020f, fountain_info), /* FOUNTAIN ISO */
127 ATP_DEVICE(0x030a, fountain_info), /* FOUNTAIN TP ONLY */
128 ATP_DEVICE(0x030b, geyser1_info), /* GEYSER 1 TP ONLY */
129
130 /* PowerBooks Oct 2005 */
131 ATP_DEVICE(0x0214, geyser2_info), /* GEYSER 2 ANSI */
132 ATP_DEVICE(0x0215, geyser2_info), /* GEYSER 2 ISO */
133 ATP_DEVICE(0x0216, geyser2_info), /* GEYSER 2 JIS */
134
135 /* Core Duo MacBook & MacBook Pro */
136 ATP_DEVICE(0x0217, geyser3_info), /* GEYSER 3 ANSI */
137 ATP_DEVICE(0x0218, geyser3_info), /* GEYSER 3 ISO */
138 ATP_DEVICE(0x0219, geyser3_info), /* GEYSER 3 JIS */
139
140 /* Core2 Duo MacBook & MacBook Pro */
141 ATP_DEVICE(0x021a, geyser4_info), /* GEYSER 4 ANSI */
142 ATP_DEVICE(0x021b, geyser4_info), /* GEYSER 4 ISO */
143 ATP_DEVICE(0x021c, geyser4_info), /* GEYSER 4 JIS */
144
145 /* Core2 Duo MacBook3,1 */
146 ATP_DEVICE(0x0229, geyser4_info), /* GEYSER 4 HF ANSI */
147 ATP_DEVICE(0x022a, geyser4_info), /* GEYSER 4 HF ISO */
148 ATP_DEVICE(0x022b, geyser4_info), /* GEYSER 4 HF JIS */
149
150 /* Terminating entry */
151 { }
152 };
153 MODULE_DEVICE_TABLE(usb, atp_table);
154
155 /* maximum number of sensors */
156 #define ATP_XSENSORS 26
157 #define ATP_YSENSORS 16
158
159 /* amount of fuzz this touchpad generates */
160 #define ATP_FUZZ 16
161
162 /* maximum pressure this driver will report */
163 #define ATP_PRESSURE 300
164
165 /*
166 * Threshold for the touchpad sensors. Any change less than ATP_THRESHOLD is
167 * ignored.
168 */
169 #define ATP_THRESHOLD 5
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 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 usb_device *udev)
257 {
258 char *data;
259 int size;
260 int i;
261 int ret;
262
263 data = kmalloc(8, GFP_KERNEL);
264 if (!data) {
265 err("Out of memory");
266 return -ENOMEM;
267 }
268
269 size = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
270 ATP_GEYSER_MODE_READ_REQUEST_ID,
271 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
272 ATP_GEYSER_MODE_REQUEST_VALUE,
273 ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000);
274
275 if (size != 8) {
276 dprintk("atp_geyser_init: read error\n");
277 for (i = 0; i < 8; i++)
278 dprintk("appletouch[%d]: %d\n", i, data[i]);
279
280 err("Failed to read mode from device.");
281 ret = -EIO;
282 goto out_free;
283 }
284
285 /* Apply the mode switch */
286 data[0] = ATP_GEYSER_MODE_VENDOR_VALUE;
287
288 size = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
289 ATP_GEYSER_MODE_WRITE_REQUEST_ID,
290 USB_DIR_OUT | 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: write error\n");
296 for (i = 0; i < 8; i++)
297 dprintk("appletouch[%d]: %d\n", i, data[i]);
298
299 err("Failed to request geyser raw mode");
300 ret = -EIO;
301 goto out_free;
302 }
303 ret = 0;
304 out_free:
305 kfree(data);
306 return ret;
307 }
308
309 /*
310 * Reinitialise the device. This usually stops stream of empty packets
311 * coming from it.
312 */
313 static void atp_reinit(struct work_struct *work)
314 {
315 struct atp *dev = container_of(work, struct atp, work);
316 struct usb_device *udev = dev->udev;
317 int retval;
318
319 dprintk("appletouch: putting appletouch to sleep (reinit)\n");
320 atp_geyser_init(udev);
321
322 retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
323 if (retval)
324 err("atp_reinit: usb_submit_urb failed with error %d",
325 retval);
326 }
327
328 static int atp_calculate_abs(int *xy_sensors, int nb_sensors, int fact,
329 int *z, int *fingers)
330 {
331 int i;
332 /* values to calculate mean */
333 int pcum = 0, psum = 0;
334 int is_increasing = 0;
335
336 *fingers = 0;
337
338 for (i = 0; i < nb_sensors; i++) {
339 if (xy_sensors[i] < threshold) {
340 if (is_increasing)
341 is_increasing = 0;
342
343 continue;
344 }
345
346 /*
347 * Makes the finger detection more versatile. For example,
348 * two fingers with no gap will be detected. Also, my
349 * tests show it less likely to have intermittent loss
350 * of multiple finger readings while moving around (scrolling).
351 *
352 * Changes the multiple finger detection to counting humps on
353 * sensors (transitions from nonincreasing to increasing)
354 * instead of counting transitions from low sensors (no
355 * finger reading) to high sensors (finger above
356 * sensor)
357 *
358 * - Jason Parekh <jasonparekh@gmail.com>
359 */
360 if (i < 1 ||
361 (!is_increasing && xy_sensors[i - 1] < xy_sensors[i])) {
362 (*fingers)++;
363 is_increasing = 1;
364 } else if (i > 0 && (xy_sensors[i - 1] - xy_sensors[i] > threshold)) {
365 is_increasing = 0;
366 }
367
368 /*
369 * Subtracts threshold so a high sensor that just passes the
370 * threshold won't skew the calculated absolute coordinate.
371 * Fixes an issue where slowly moving the mouse would
372 * occasionally jump a number of pixels (slowly moving the
373 * finger makes this issue most apparent.)
374 */
375 pcum += (xy_sensors[i] - threshold) * i;
376 psum += (xy_sensors[i] - threshold);
377 }
378
379 if (psum > 0) {
380 *z = psum;
381 return pcum * fact / psum;
382 }
383
384 return 0;
385 }
386
387 static inline void atp_report_fingers(struct input_dev *input, int fingers)
388 {
389 input_report_key(input, BTN_TOOL_FINGER, fingers == 1);
390 input_report_key(input, BTN_TOOL_DOUBLETAP, fingers == 2);
391 input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2);
392 }
393
394 /* Check URB status and for correct length of data package */
395
396 #define ATP_URB_STATUS_SUCCESS 0
397 #define ATP_URB_STATUS_ERROR 1
398 #define ATP_URB_STATUS_ERROR_FATAL 2
399
400 static int atp_status_check(struct urb *urb)
401 {
402 struct atp *dev = urb->context;
403
404 switch (urb->status) {
405 case 0:
406 /* success */
407 break;
408 case -EOVERFLOW:
409 if (!dev->overflow_warned) {
410 printk(KERN_WARNING "appletouch: OVERFLOW with data "
411 "length %d, actual length is %d\n",
412 dev->info->datalen, dev->urb->actual_length);
413 dev->overflow_warned = true;
414 }
415 case -ECONNRESET:
416 case -ENOENT:
417 case -ESHUTDOWN:
418 /* This urb is terminated, clean up */
419 dbg("atp_complete: urb shutting down with status: %d",
420 urb->status);
421 return ATP_URB_STATUS_ERROR_FATAL;
422
423 default:
424 dbg("atp_complete: nonzero urb status received: %d",
425 urb->status);
426 return ATP_URB_STATUS_ERROR;
427 }
428
429 /* drop incomplete datasets */
430 if (dev->urb->actual_length != dev->info->datalen) {
431 dprintk("appletouch: incomplete data package"
432 " (first byte: %d, length: %d).\n",
433 dev->data[0], dev->urb->actual_length);
434 return ATP_URB_STATUS_ERROR;
435 }
436
437 return ATP_URB_STATUS_SUCCESS;
438 }
439
440 static void atp_detect_size(struct atp *dev)
441 {
442 int i;
443
444 /* 17" Powerbooks have extra X sensors */
445 for (i = dev->info->xsensors; i < ATP_XSENSORS; i++) {
446 if (dev->xy_cur[i]) {
447
448 printk(KERN_INFO "appletouch: 17\" model detected.\n");
449
450 input_set_abs_params(dev->input, ABS_X, 0,
451 (dev->info->xsensors_17 - 1) *
452 dev->info->xfact - 1,
453 ATP_FUZZ, 0);
454 break;
455 }
456 }
457 }
458
459 /*
460 * USB interrupt callback functions
461 */
462
463 /* Interrupt function for older touchpads: FOUNTAIN/GEYSER1/GEYSER2 */
464
465 static void atp_complete_geyser_1_2(struct urb *urb)
466 {
467 int x, y, x_z, y_z, x_f, y_f;
468 int retval, i, j;
469 int key;
470 struct atp *dev = urb->context;
471 int status = atp_status_check(urb);
472
473 if (status == ATP_URB_STATUS_ERROR_FATAL)
474 return;
475 else if (status == ATP_URB_STATUS_ERROR)
476 goto exit;
477
478 /* reorder the sensors values */
479 if (dev->info == &geyser2_info) {
480 memset(dev->xy_cur, 0, sizeof(dev->xy_cur));
481
482 /*
483 * The values are laid out like this:
484 * Y1, Y2, -, Y3, Y4, -, ..., X1, X2, -, X3, X4, -, ...
485 * '-' is an unused value.
486 */
487
488 /* read X values */
489 for (i = 0, j = 19; i < 20; i += 2, j += 3) {
490 dev->xy_cur[i] = dev->data[j];
491 dev->xy_cur[i + 1] = dev->data[j + 1];
492 }
493
494 /* read Y values */
495 for (i = 0, j = 1; i < 9; i += 2, j += 3) {
496 dev->xy_cur[ATP_XSENSORS + i] = dev->data[j];
497 dev->xy_cur[ATP_XSENSORS + i + 1] = dev->data[j + 1];
498 }
499 } else {
500 for (i = 0; i < 8; i++) {
501 /* X values */
502 dev->xy_cur[i + 0] = dev->data[5 * i + 2];
503 dev->xy_cur[i + 8] = dev->data[5 * i + 4];
504 dev->xy_cur[i + 16] = dev->data[5 * i + 42];
505 if (i < 2)
506 dev->xy_cur[i + 24] = dev->data[5 * i + 44];
507
508 /* Y values */
509 dev->xy_cur[ATP_XSENSORS + i] = dev->data[5 * i + 1];
510 dev->xy_cur[ATP_XSENSORS + i + 8] = dev->data[5 * i + 3];
511 }
512 }
513
514 dbg_dump("sample", dev->xy_cur);
515
516 if (!dev->valid) {
517 /* first sample */
518 dev->valid = true;
519 dev->x_old = dev->y_old = -1;
520
521 /* Store first sample */
522 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
523
524 /* Perform size detection, if not done already */
525 if (unlikely(!dev->size_detect_done)) {
526 atp_detect_size(dev);
527 dev->size_detect_done = 1;
528 goto exit;
529 }
530 }
531
532 for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) {
533 /* accumulate the change */
534 signed char change = dev->xy_old[i] - dev->xy_cur[i];
535 dev->xy_acc[i] -= change;
536
537 /* prevent down drifting */
538 if (dev->xy_acc[i] < 0)
539 dev->xy_acc[i] = 0;
540 }
541
542 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
543
544 dbg_dump("accumulator", dev->xy_acc);
545
546 x = atp_calculate_abs(dev->xy_acc, ATP_XSENSORS,
547 dev->info->xfact, &x_z, &x_f);
548 y = atp_calculate_abs(dev->xy_acc + ATP_XSENSORS, ATP_YSENSORS,
549 dev->info->yfact, &y_z, &y_f);
550 key = dev->data[dev->info->datalen - 1] & ATP_STATUS_BUTTON;
551
552 if (x && y) {
553 if (dev->x_old != -1) {
554 x = (dev->x_old * 3 + x) >> 2;
555 y = (dev->y_old * 3 + y) >> 2;
556 dev->x_old = x;
557 dev->y_old = y;
558
559 if (debug > 1)
560 printk(KERN_DEBUG "appletouch: "
561 "X: %3d Y: %3d Xz: %3d Yz: %3d\n",
562 x, y, x_z, y_z);
563
564 input_report_key(dev->input, BTN_TOUCH, 1);
565 input_report_abs(dev->input, ABS_X, x);
566 input_report_abs(dev->input, ABS_Y, y);
567 input_report_abs(dev->input, ABS_PRESSURE,
568 min(ATP_PRESSURE, x_z + y_z));
569 atp_report_fingers(dev->input, max(x_f, y_f));
570 }
571 dev->x_old = x;
572 dev->y_old = y;
573
574 } else if (!x && !y) {
575
576 dev->x_old = dev->y_old = -1;
577 input_report_key(dev->input, BTN_TOUCH, 0);
578 input_report_abs(dev->input, ABS_PRESSURE, 0);
579 atp_report_fingers(dev->input, 0);
580
581 /* reset the accumulator on release */
582 memset(dev->xy_acc, 0, sizeof(dev->xy_acc));
583 }
584
585 input_report_key(dev->input, BTN_LEFT, key);
586 input_sync(dev->input);
587
588 exit:
589 retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
590 if (retval)
591 err("atp_complete: usb_submit_urb failed with result %d",
592 retval);
593 }
594
595 /* Interrupt function for older touchpads: GEYSER3/GEYSER4 */
596
597 static void atp_complete_geyser_3_4(struct urb *urb)
598 {
599 int x, y, x_z, y_z, x_f, y_f;
600 int retval, i, j;
601 int key;
602 struct atp *dev = urb->context;
603 int status = atp_status_check(urb);
604
605 if (status == ATP_URB_STATUS_ERROR_FATAL)
606 return;
607 else if (status == ATP_URB_STATUS_ERROR)
608 goto exit;
609
610 /* Reorder the sensors values:
611 *
612 * The values are laid out like this:
613 * -, Y1, Y2, -, Y3, Y4, -, ..., -, X1, X2, -, X3, X4, ...
614 * '-' is an unused value.
615 */
616
617 /* read X values */
618 for (i = 0, j = 19; i < 20; i += 2, j += 3) {
619 dev->xy_cur[i] = dev->data[j + 1];
620 dev->xy_cur[i + 1] = dev->data[j + 2];
621 }
622 /* read Y values */
623 for (i = 0, j = 1; i < 9; i += 2, j += 3) {
624 dev->xy_cur[ATP_XSENSORS + i] = dev->data[j + 1];
625 dev->xy_cur[ATP_XSENSORS + i + 1] = dev->data[j + 2];
626 }
627
628 dbg_dump("sample", dev->xy_cur);
629
630 /* Just update the base values (i.e. touchpad in untouched state) */
631 if (dev->data[dev->info->datalen - 1] & ATP_STATUS_BASE_UPDATE) {
632
633 dprintk("appletouch: updated base values\n");
634
635 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
636 goto exit;
637 }
638
639 for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) {
640 /* calculate the change */
641 dev->xy_acc[i] = dev->xy_cur[i] - dev->xy_old[i];
642
643 /* this is a round-robin value, so couple with that */
644 if (dev->xy_acc[i] > 127)
645 dev->xy_acc[i] -= 256;
646
647 if (dev->xy_acc[i] < -127)
648 dev->xy_acc[i] += 256;
649
650 /* prevent down drifting */
651 if (dev->xy_acc[i] < 0)
652 dev->xy_acc[i] = 0;
653 }
654
655 dbg_dump("accumulator", dev->xy_acc);
656
657 x = atp_calculate_abs(dev->xy_acc, ATP_XSENSORS,
658 dev->info->xfact, &x_z, &x_f);
659 y = atp_calculate_abs(dev->xy_acc + ATP_XSENSORS, ATP_YSENSORS,
660 dev->info->yfact, &y_z, &y_f);
661 key = dev->data[dev->info->datalen - 1] & ATP_STATUS_BUTTON;
662
663 if (x && y) {
664 if (dev->x_old != -1) {
665 x = (dev->x_old * 3 + x) >> 2;
666 y = (dev->y_old * 3 + y) >> 2;
667 dev->x_old = x;
668 dev->y_old = y;
669
670 if (debug > 1)
671 printk(KERN_DEBUG "appletouch: X: %3d Y: %3d "
672 "Xz: %3d Yz: %3d\n",
673 x, y, x_z, y_z);
674
675 input_report_key(dev->input, BTN_TOUCH, 1);
676 input_report_abs(dev->input, ABS_X, x);
677 input_report_abs(dev->input, ABS_Y, y);
678 input_report_abs(dev->input, ABS_PRESSURE,
679 min(ATP_PRESSURE, x_z + y_z));
680 atp_report_fingers(dev->input, max(x_f, y_f));
681 }
682 dev->x_old = x;
683 dev->y_old = y;
684
685 } else if (!x && !y) {
686
687 dev->x_old = dev->y_old = -1;
688 input_report_key(dev->input, BTN_TOUCH, 0);
689 input_report_abs(dev->input, ABS_PRESSURE, 0);
690 atp_report_fingers(dev->input, 0);
691
692 /* reset the accumulator on release */
693 memset(dev->xy_acc, 0, sizeof(dev->xy_acc));
694 }
695
696 input_report_key(dev->input, BTN_LEFT, key);
697 input_sync(dev->input);
698
699 /*
700 * Geysers 3/4 will continue to send packets continually after
701 * the first touch unless reinitialised. Do so if it's been
702 * idle for a while in order to avoid waking the kernel up
703 * several hundred times a second.
704 */
705
706 /*
707 * Button must not be pressed when entering suspend,
708 * otherwise we will never release the button.
709 */
710 if (!x && !y && !key) {
711 dev->idlecount++;
712 if (dev->idlecount == 10) {
713 dev->x_old = dev->y_old = -1;
714 dev->idlecount = 0;
715 schedule_work(&dev->work);
716 /* Don't resubmit urb here, wait for reinit */
717 return;
718 }
719 } else
720 dev->idlecount = 0;
721
722 exit:
723 retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
724 if (retval)
725 err("atp_complete: usb_submit_urb failed with result %d",
726 retval);
727 }
728
729 static int atp_open(struct input_dev *input)
730 {
731 struct atp *dev = input_get_drvdata(input);
732
733 if (usb_submit_urb(dev->urb, GFP_ATOMIC))
734 return -EIO;
735
736 dev->open = 1;
737 return 0;
738 }
739
740 static void atp_close(struct input_dev *input)
741 {
742 struct atp *dev = input_get_drvdata(input);
743
744 usb_kill_urb(dev->urb);
745 cancel_work_sync(&dev->work);
746 dev->open = 0;
747 }
748
749 static int atp_handle_geyser(struct atp *dev)
750 {
751 struct usb_device *udev = dev->udev;
752
753 if (dev->info != &fountain_info) {
754 /* switch to raw sensor mode */
755 if (atp_geyser_init(udev))
756 return -EIO;
757
758 printk(KERN_INFO "appletouch: Geyser mode initialized.\n");
759 }
760
761 return 0;
762 }
763
764 static int atp_probe(struct usb_interface *iface,
765 const struct usb_device_id *id)
766 {
767 struct atp *dev;
768 struct input_dev *input_dev;
769 struct usb_device *udev = interface_to_usbdev(iface);
770 struct usb_host_interface *iface_desc;
771 struct usb_endpoint_descriptor *endpoint;
772 int int_in_endpointAddr = 0;
773 int i, error = -ENOMEM;
774 const struct atp_info *info = (const struct atp_info *)id->driver_info;
775
776 /* set up the endpoint information */
777 /* use only the first interrupt-in endpoint */
778 iface_desc = iface->cur_altsetting;
779 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
780 endpoint = &iface_desc->endpoint[i].desc;
781 if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) {
782 /* we found an interrupt in endpoint */
783 int_in_endpointAddr = endpoint->bEndpointAddress;
784 break;
785 }
786 }
787 if (!int_in_endpointAddr) {
788 err("Could not find int-in endpoint");
789 return -EIO;
790 }
791
792 /* allocate memory for our device state and initialize it */
793 dev = kzalloc(sizeof(struct atp), GFP_KERNEL);
794 input_dev = input_allocate_device();
795 if (!dev || !input_dev) {
796 err("Out of memory");
797 goto err_free_devs;
798 }
799
800 dev->udev = udev;
801 dev->input = input_dev;
802 dev->info = info;
803 dev->overflow_warned = false;
804
805 dev->urb = usb_alloc_urb(0, GFP_KERNEL);
806 if (!dev->urb)
807 goto err_free_devs;
808
809 dev->data = usb_alloc_coherent(dev->udev, dev->info->datalen, GFP_KERNEL,
810 &dev->urb->transfer_dma);
811 if (!dev->data)
812 goto err_free_urb;
813
814 usb_fill_int_urb(dev->urb, udev,
815 usb_rcvintpipe(udev, int_in_endpointAddr),
816 dev->data, dev->info->datalen,
817 dev->info->callback, dev, 1);
818
819 error = atp_handle_geyser(dev);
820 if (error)
821 goto err_free_buffer;
822
823 usb_make_path(udev, dev->phys, sizeof(dev->phys));
824 strlcat(dev->phys, "/input0", sizeof(dev->phys));
825
826 input_dev->name = "appletouch";
827 input_dev->phys = dev->phys;
828 usb_to_input_id(dev->udev, &input_dev->id);
829 input_dev->dev.parent = &iface->dev;
830
831 input_set_drvdata(input_dev, dev);
832
833 input_dev->open = atp_open;
834 input_dev->close = atp_close;
835
836 set_bit(EV_ABS, input_dev->evbit);
837
838 input_set_abs_params(input_dev, ABS_X, 0,
839 (dev->info->xsensors - 1) * dev->info->xfact - 1,
840 ATP_FUZZ, 0);
841 input_set_abs_params(input_dev, ABS_Y, 0,
842 (dev->info->ysensors - 1) * dev->info->yfact - 1,
843 ATP_FUZZ, 0);
844 input_set_abs_params(input_dev, ABS_PRESSURE, 0, ATP_PRESSURE, 0, 0);
845
846 set_bit(EV_KEY, input_dev->evbit);
847 set_bit(BTN_TOUCH, input_dev->keybit);
848 set_bit(BTN_TOOL_FINGER, input_dev->keybit);
849 set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
850 set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
851 set_bit(BTN_LEFT, input_dev->keybit);
852
853 error = input_register_device(dev->input);
854 if (error)
855 goto err_free_buffer;
856
857 /* save our data pointer in this interface device */
858 usb_set_intfdata(iface, dev);
859
860 INIT_WORK(&dev->work, atp_reinit);
861
862 return 0;
863
864 err_free_buffer:
865 usb_free_coherent(dev->udev, dev->info->datalen,
866 dev->data, dev->urb->transfer_dma);
867 err_free_urb:
868 usb_free_urb(dev->urb);
869 err_free_devs:
870 usb_set_intfdata(iface, NULL);
871 kfree(dev);
872 input_free_device(input_dev);
873 return error;
874 }
875
876 static void atp_disconnect(struct usb_interface *iface)
877 {
878 struct atp *dev = usb_get_intfdata(iface);
879
880 usb_set_intfdata(iface, NULL);
881 if (dev) {
882 usb_kill_urb(dev->urb);
883 input_unregister_device(dev->input);
884 usb_free_coherent(dev->udev, dev->info->datalen,
885 dev->data, dev->urb->transfer_dma);
886 usb_free_urb(dev->urb);
887 kfree(dev);
888 }
889 printk(KERN_INFO "input: appletouch disconnected\n");
890 }
891
892 static int atp_recover(struct atp *dev)
893 {
894 int error;
895
896 error = atp_handle_geyser(dev);
897 if (error)
898 return error;
899
900 if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC))
901 return -EIO;
902
903 return 0;
904 }
905
906 static int atp_suspend(struct usb_interface *iface, pm_message_t message)
907 {
908 struct atp *dev = usb_get_intfdata(iface);
909
910 usb_kill_urb(dev->urb);
911 return 0;
912 }
913
914 static int atp_resume(struct usb_interface *iface)
915 {
916 struct atp *dev = usb_get_intfdata(iface);
917
918 if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC))
919 return -EIO;
920
921 return 0;
922 }
923
924 static int atp_reset_resume(struct usb_interface *iface)
925 {
926 struct atp *dev = usb_get_intfdata(iface);
927
928 return atp_recover(dev);
929 }
930
931 static struct usb_driver atp_driver = {
932 .name = "appletouch",
933 .probe = atp_probe,
934 .disconnect = atp_disconnect,
935 .suspend = atp_suspend,
936 .resume = atp_resume,
937 .reset_resume = atp_reset_resume,
938 .id_table = atp_table,
939 };
940
941 static int __init atp_init(void)
942 {
943 return usb_register(&atp_driver);
944 }
945
946 static void __exit atp_exit(void)
947 {
948 usb_deregister(&atp_driver);
949 }
950
951 module_init(atp_init);
952 module_exit(atp_exit);