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 */
atp_geyser_init(struct atp * dev)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 */
atp_reinit(struct work_struct * work)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
atp_calculate_abs(struct atp * dev,int offset,int nb_sensors,int fact,int * z,int * fingers)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
atp_report_fingers(struct input_dev * input,int fingers)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
atp_status_check(struct urb * urb)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
atp_detect_size(struct atp * dev)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
atp_complete_geyser_1_2(struct urb * urb)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
atp_complete_geyser_3_4(struct urb * urb)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
atp_open(struct input_dev * input)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
atp_close(struct input_dev * input)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
atp_handle_geyser(struct atp * dev)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
atp_probe(struct usb_interface * iface,const struct usb_device_id * id)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(*dev), 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
atp_disconnect(struct usb_interface * iface)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
atp_recover(struct atp * dev)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
atp_suspend(struct usb_interface * iface,pm_message_t message)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
atp_resume(struct usb_interface * iface)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
atp_reset_resume(struct usb_interface * iface)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