aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/input/appletouch.c
blob: 1949b54f41f2500abfdd24372fb5ea19e37df0f7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
/*
 * Apple USB Touchpad (for post-February 2005 PowerBooks) driver
 *
 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2005      Johannes Berg (johannes@sipsolutions.net)
 * Copyright (C) 2005      Stelian Pop (stelian@popies.net)
 * Copyright (C) 2005      Frank Arnold (frank@scirocco-5v-turbo.de)
 * Copyright (C) 2005      Peter Osterlund (petero2@telia.com)
 *
 * Thanks to Alex Harper <basilisk@foobox.net> for his inputs.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/input.h>
#include <linux/usb_input.h>

/* Apple has powerbooks which have the keyboard with different Product IDs */
#define APPLE_VENDOR_ID		0x05AC

#define ATP_DEVICE(prod)					\
	.match_flags = USB_DEVICE_ID_MATCH_DEVICE |		\
		       USB_DEVICE_ID_MATCH_INT_CLASS |		\
		       USB_DEVICE_ID_MATCH_INT_PROTOCOL,	\
	.idVendor = APPLE_VENDOR_ID,				\
	.idProduct = (prod),					\
	.bInterfaceClass = 0x03,				\
	.bInterfaceProtocol = 0x02

/* table of devices that work with this driver */
static struct usb_device_id atp_table [] = {
	{ ATP_DEVICE(0x020E) },
	{ ATP_DEVICE(0x020F) },
	{ ATP_DEVICE(0x030A) },
	{ ATP_DEVICE(0x030B) },
	{ }					/* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, atp_table);

/* size of a USB urb transfer */
#define ATP_DATASIZE	81

/*
 * number of sensors. Note that only 16 instead of 26 X (horizontal)
 * sensors exist on 12" and 15" PowerBooks. All models have 16 Y
 * (vertical) sensors.
 */
#define ATP_XSENSORS	26
#define ATP_YSENSORS	16

/* amount of fuzz this touchpad generates */
#define ATP_FUZZ	16

/* maximum pressure this driver will report */
#define ATP_PRESSURE	300
/*
 * multiplication factor for the X and Y coordinates.
 * We try to keep the touchpad aspect ratio while still doing only simple
 * arithmetics.
 * The factors below give coordinates like:
 *	0 <= x <  960 on 12" and 15" Powerbooks
 *	0 <= x < 1600 on 17" Powerbooks
 *	0 <= y <  646
 */
#define ATP_XFACT	64
#define ATP_YFACT	43

/*
 * Threshold for the touchpad sensors. Any change less than ATP_THRESHOLD is
 * ignored.
 */
#define ATP_THRESHOLD	 5

/* Structure to hold all of our device specific stuff */
struct atp {
	char			phys[64];
	struct usb_device *	udev;		/* usb device */
	struct urb *		urb;		/* usb request block */
	signed char *		data;		/* transferred data */
	int			open;		/* non-zero if opened */
	struct input_dev	*input;		/* input dev */
	int			valid;		/* are the sensors valid ? */
	int			x_old;		/* last reported x/y, */
	int			y_old;		/* used for smoothing */
						/* current value of the sensors */
	signed char		xy_cur[ATP_XSENSORS + ATP_YSENSORS];
						/* last value of the sensors */
	signed char		xy_old[ATP_XSENSORS + ATP_YSENSORS];
						/* accumulated sensors */
	int			xy_acc[ATP_XSENSORS + ATP_YSENSORS];
};

#define dbg_dump(msg, tab) \
	if (debug > 1) {						\
		int i;							\
		printk("appletouch: %s %lld", msg, (long long)jiffies); \
		for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++)	\
			printk(" %02x", tab[i]);			\
		printk("\n");						\
	}

#define dprintk(format, a...)						\
	do {								\
		if (debug) printk(format, ##a);				\
	} while (0)

MODULE_AUTHOR("Johannes Berg, Stelian Pop, Frank Arnold");
MODULE_DESCRIPTION("Apple PowerBooks USB touchpad driver");
MODULE_LICENSE("GPL");

static int debug = 1;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Activate debugging output");

static int atp_calculate_abs(int *xy_sensors, int nb_sensors, int fact,
			     int *z, int *fingers)
{
	int i;
	/* values to calculate mean */
	int pcum = 0, psum = 0;

	*fingers = 0;

	for (i = 0; i < nb_sensors; i++) {
		if (xy_sensors[i] < ATP_THRESHOLD)
			continue;
		if ((i - 1 < 0) || (xy_sensors[i - 1] < ATP_THRESHOLD))
			(*fingers)++;
		pcum += xy_sensors[i] * i;
		psum += xy_sensors[i];
	}

	if (psum > 0) {
		*z = psum;
		return pcum * fact / psum;
	}

	return 0;
}

static inline void atp_report_fingers(struct input_dev *input, int fingers)
{
	input_report_key(input, BTN_TOOL_FINGER, fingers == 1);
	input_report_key(input, BTN_TOOL_DOUBLETAP, fingers == 2);
	input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2);
}

static void atp_complete(struct urb* urb, struct pt_regs* regs)
{
	int x, y, x_z, y_z, x_f, y_f;
	int retval, i;
	struct atp *dev = urb->context;

	switch (urb->status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* This urb is terminated, clean up */
		dbg("%s - urb shutting down with status: %d",
		    __FUNCTION__, urb->status);
		return;
	default:
		dbg("%s - nonzero urb status received: %d",
		    __FUNCTION__, urb->status);
		goto exit;
	}

	/* drop incomplete datasets */
	if (dev->urb->actual_length != ATP_DATASIZE) {
		dprintk("appletouch: incomplete data package.\n");
		goto exit;
	}

	/* reorder the sensors values */
	for (i = 0; i < 8; i++) {
		/* X values */
		dev->xy_cur[i     ] = dev->data[5 * i +  2];
		dev->xy_cur[i +  8] = dev->data[5 * i +  4];
		dev->xy_cur[i + 16] = dev->data[5 * i + 42];
		if (i < 2)
			dev->xy_cur[i + 24] = dev->data[5 * i + 44];

		/* Y values */
		dev->xy_cur[i + 26] = dev->data[5 * i +  1];
		dev->xy_cur[i + 34] = dev->data[5 * i +  3];
	}

	dbg_dump("sample", dev->xy_cur);

	if (!dev->valid) {
		/* first sample */
		dev->valid = 1;
		dev->x_old = dev->y_old = -1;
		memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));

		/* 17" Powerbooks have 10 extra X sensors */
		for (i = 16; i < ATP_XSENSORS; i++)
			if (dev->xy_cur[i]) {
				printk("appletouch: 17\" model detected.\n");
				input_set_abs_params(dev->input, ABS_X, 0,
						     (ATP_XSENSORS - 1) *
						     ATP_XFACT - 1,
						     ATP_FUZZ, 0);
				break;
			}

		goto exit;
	}

	for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) {
		/* accumulate the change */
		signed char change = dev->xy_old[i] - dev->xy_cur[i];
		dev->xy_acc[i] -= change;

		/* prevent down drifting */
		if (dev->xy_acc[i] < 0)
			dev->xy_acc[i] = 0;
	}

	memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));

	dbg_dump("accumulator", dev->xy_acc);

	x = atp_calculate_abs(dev->xy_acc, ATP_XSENSORS,
			      ATP_XFACT, &x_z, &x_f);
	y = atp_calculate_abs(dev->xy_acc + ATP_XSENSORS, ATP_YSENSORS,
			      ATP_YFACT, &y_z, &y_f);

	if (x && y) {
		if (dev->x_old != -1) {
			x = (dev->x_old * 3 + x) >> 2;
			y = (dev->y_old * 3 + y) >> 2;
			dev->x_old = x;
			dev->y_old = y;

			if (debug > 1)
				printk("appletouch: X: %3d Y: %3d "
				       "Xz: %3d Yz: %3d\n",
				       x, y, x_z, y_z);

			input_report_key(dev->input, BTN_TOUCH, 1);
			input_report_abs(dev->input, ABS_X, x);
			input_report_abs(dev->input, ABS_Y, y);
			input_report_abs(dev->input, ABS_PRESSURE,
					 min(ATP_PRESSURE, x_z + y_z));
			atp_report_fingers(dev->input, max(x_f, y_f));
		}
		dev->x_old = x;
		dev->y_old = y;
	}
	else if (!x && !y) {

		dev->x_old = dev->y_old = -1;
		input_report_key(dev->input, BTN_TOUCH, 0);
		input_report_abs(dev->input, ABS_PRESSURE, 0);
		atp_report_fingers(dev->input, 0);

		/* reset the accumulator on release */
		memset(dev->xy_acc, 0, sizeof(dev->xy_acc));
	}

	input_report_key(dev->input, BTN_LEFT, !!dev->data[80]);

	input_sync(dev->input);

exit:
	retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
	if (retval) {
		err("%s - usb_submit_urb failed with result %d",
		    __FUNCTION__, retval);
	}
}

static int atp_open(struct input_dev *input)
{
	struct atp *dev = input->private;

	if (usb_submit_urb(dev->urb, GFP_ATOMIC))
		return -EIO;

	dev->open = 1;
	return 0;
}

static void atp_close(struct input_dev *input)
{
	struct atp *dev = input->private;

	usb_kill_urb(dev->urb);
	dev->open = 0;
}

static int atp_probe(struct usb_interface *iface, const struct usb_device_id *id)
{
	struct atp *dev;
	struct input_dev *input_dev;
	struct usb_device *udev = interface_to_usbdev(iface);
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	int int_in_endpointAddr = 0;
	int i, retval = -ENOMEM;


	/* set up the endpoint information */
	/* use only the first interrupt-in endpoint */
	iface_desc = iface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
		endpoint = &iface_desc->endpoint[i].desc;
		if (!int_in_endpointAddr &&
		    (endpoint->bEndpointAddress & USB_DIR_IN) &&
		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
					== USB_ENDPOINT_XFER_INT)) {
			/* we found an interrupt in endpoint */
			int_in_endpointAddr = endpoint->bEndpointAddress;
			break;
		}
	}
	if (!int_in_endpointAddr) {
		err("Could not find int-in endpoint");
		return -EIO;
	}

	/* allocate memory for our device state and initialize it */
	dev = kzalloc(sizeof(struct atp), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!dev || !input_dev) {
		err("Out of memory");
		goto err_free_devs;
	}

	dev->udev = udev;
	dev->input = input_dev;

	dev->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->urb) {
		retval = -ENOMEM;
		goto err_free_devs;
	}

	dev->data = usb_buffer_alloc(dev->udev, ATP_DATASIZE, GFP_KERNEL,
				     &dev->urb->transfer_dma);
	if (!dev->data) {
		retval = -ENOMEM;
		goto err_free_urb;
	}

	usb_fill_int_urb(dev->urb, udev,
			 usb_rcvintpipe(udev, int_in_endpointAddr),
			 dev->data, ATP_DATASIZE, atp_complete, dev, 1);

	usb_make_path(udev, dev->phys, sizeof(dev->phys));
	strlcat(dev->phys, "/input0", sizeof(dev->phys));

	input_dev->name = "appletouch";
	input_dev->phys = dev->phys;
	usb_to_input_id(dev->udev, &input_dev->id);
	input_dev->cdev.dev = &iface->dev;

	input_dev->private = dev;
	input_dev->open = atp_open;
	input_dev->close = atp_close;

	set_bit(EV_ABS, input_dev->evbit);

	/*
	 * 12" and 15" Powerbooks only have 16 x sensors,
	 * 17" models are detected later.
	 */
	input_set_abs_params(input_dev, ABS_X, 0,
			     (16 - 1) * ATP_XFACT - 1, ATP_FUZZ, 0);
	input_set_abs_params(input_dev, ABS_Y, 0,
			     (ATP_YSENSORS - 1) * ATP_YFACT - 1, ATP_FUZZ, 0);
	input_set_abs_params(input_dev, ABS_PRESSURE, 0, ATP_PRESSURE, 0, 0);

	set_bit(EV_KEY, input_dev->evbit);
	set_bit(BTN_TOUCH, input_dev->keybit);
	set_bit(BTN_TOOL_FINGER, input_dev->keybit);
	set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
	set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
	set_bit(BTN_LEFT, input_dev->keybit);

	input_register_device(dev->input);

	/* save our data pointer in this interface device */
	usb_set_intfdata(iface, dev);

	return 0;

 err_free_urb:
	usb_free_urb(dev->urb);
 err_free_devs:
	usb_set_intfdata(iface, NULL);
	kfree(dev);
	input_free_device(input_dev);
	return retval;
}

static void atp_disconnect(struct usb_interface *iface)
{
	struct atp *dev = usb_get_intfdata(iface);

	usb_set_intfdata(iface, NULL);
	if (dev) {
		usb_kill_urb(dev->urb);
		input_unregister_device(dev->input);
		usb_free_urb(dev->urb);
		usb_buffer_free(dev->udev, ATP_DATASIZE,
				dev->data, dev->urb->transfer_dma);
		kfree(dev);
	}
	printk(KERN_INFO "input: appletouch disconnected\n");
}

static int atp_suspend(struct usb_interface *iface, pm_message_t message)
{
	struct atp *dev = usb_get_intfdata(iface);
	usb_kill_urb(dev->urb);
	dev->valid = 0;
	return 0;
}

static int atp_resume(struct usb_interface *iface)
{
	struct atp *dev = usb_get_intfdata(iface);
	if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC))
		return -EIO;

	return 0;
}

static struct usb_driver atp_driver = {
	.name		= "appletouch",
	.probe		= atp_probe,
	.disconnect	= atp_disconnect,
	.suspend	= atp_suspend,
	.resume		= atp_resume,
	.id_table	= atp_table,
};

static int __init atp_init(void)
{
	return usb_register(&atp_driver);
}

static void __exit atp_exit(void)
{
	usb_deregister(&atp_driver);
}

module_init(atp_init);
module_exit(atp_exit);