summaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-lenovo-tpkbd.c
blob: cea016e94f43e336ec1a4d73eb2cbbdba9e1ace7 (plain)
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
475
476
477
478
479
480
481
482
483
484
485
/*
 *  HID driver for Lenovo ThinkPad USB Keyboard with TrackPoint
 *
 *  Copyright (c) 2012 Bernhard Seibold
 */

/*
 * 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.
 */

#include <linux/module.h>
#include <linux/sysfs.h>
#include <linux/device.h>
#include <linux/usb.h>
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/leds.h>
#include "usbhid/usbhid.h"

#include "hid-ids.h"

/* This is only used for the trackpoint part of the driver, hence _tp */
struct tpkbd_data_pointer {
	int led_state;
	struct led_classdev led_mute;
	struct led_classdev led_micmute;
	int press_to_select;
	int dragging;
	int release_to_select;
	int select_right;
	int sensitivity;
	int press_speed;
};

#define map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))

static int tpkbd_input_mapping(struct hid_device *hdev,
		struct hid_input *hi, struct hid_field *field,
		struct hid_usage *usage, unsigned long **bit, int *max)
{
	struct usbhid_device *uhdev;

	uhdev = (struct usbhid_device *) hdev->driver_data;
	if (uhdev->ifnum == 1 && usage->hid == (HID_UP_BUTTON | 0x0010)) {
		map_key_clear(KEY_MICMUTE);
		return 1;
	}
	return 0;
}

#undef map_key_clear

static int tpkbd_features_set(struct hid_device *hdev)
{
	struct hid_report *report;
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[4];

	report->field[0]->value[0]  = data_pointer->press_to_select   ? 0x01 : 0x02;
	report->field[0]->value[0] |= data_pointer->dragging          ? 0x04 : 0x08;
	report->field[0]->value[0] |= data_pointer->release_to_select ? 0x10 : 0x20;
	report->field[0]->value[0] |= data_pointer->select_right      ? 0x80 : 0x40;
	report->field[1]->value[0] = 0x03; // unknown setting, imitate windows driver
	report->field[2]->value[0] = data_pointer->sensitivity;
	report->field[3]->value[0] = data_pointer->press_speed;

	usbhid_submit_report(hdev, report, USB_DIR_OUT);
	return 0;
}

static ssize_t pointer_press_to_select_show(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->press_to_select);
}

static ssize_t pointer_press_to_select_store(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value))
		return -EINVAL;
	if (value < 0 || value > 1)
		return -EINVAL;

	data_pointer->press_to_select = value;
	tpkbd_features_set(hdev);

	return count;
}

static ssize_t pointer_dragging_show(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->dragging);
}

static ssize_t pointer_dragging_store(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value))
		return -EINVAL;
	if (value < 0 || value > 1)
		return -EINVAL;

	data_pointer->dragging = value;
	tpkbd_features_set(hdev);

	return count;
}

static ssize_t pointer_release_to_select_show(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->release_to_select);
}

static ssize_t pointer_release_to_select_store(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value))
		return -EINVAL;
	if (value < 0 || value > 1)
		return -EINVAL;

	data_pointer->release_to_select = value;
	tpkbd_features_set(hdev);

	return count;
}

static ssize_t pointer_select_right_show(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->select_right);
}

static ssize_t pointer_select_right_store(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value))
		return -EINVAL;
	if (value < 0 || value > 1)
		return -EINVAL;

	data_pointer->select_right = value;
	tpkbd_features_set(hdev);

	return count;
}

static ssize_t pointer_sensitivity_show(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n",
		data_pointer->sensitivity);
}

static ssize_t pointer_sensitivity_store(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value) || value < 1 || value > 255)
		return -EINVAL;

	data_pointer->sensitivity = value;
	tpkbd_features_set(hdev);

	return count;
}

static ssize_t pointer_press_speed_show(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	data_pointer = hid_get_drvdata(hdev);

	return snprintf(buf, PAGE_SIZE, "%u\n",
		data_pointer->press_speed);
}

static ssize_t pointer_press_speed_store(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int value;

	if (kstrtoint(buf, 10, &value) || value < 1 || value > 255)
		return -EINVAL;

	data_pointer->press_speed = value;
	tpkbd_features_set(hdev);

	return count;
}

static struct device_attribute dev_attr_pointer_press_to_select =
	__ATTR(press_to_select, S_IWUSR | S_IRUGO,
			pointer_press_to_select_show,
			pointer_press_to_select_store);

static struct device_attribute dev_attr_pointer_dragging =
	__ATTR(dragging, S_IWUSR | S_IRUGO,
			pointer_dragging_show,
			pointer_dragging_store);

static struct device_attribute dev_attr_pointer_release_to_select =
	__ATTR(release_to_select, S_IWUSR | S_IRUGO,
			pointer_release_to_select_show,
			pointer_release_to_select_store);

static struct device_attribute dev_attr_pointer_select_right =
	__ATTR(select_right, S_IWUSR | S_IRUGO,
			pointer_select_right_show,
			pointer_select_right_store);

static struct device_attribute dev_attr_pointer_sensitivity =
	__ATTR(sensitivity, S_IWUSR | S_IRUGO,
			pointer_sensitivity_show,
			pointer_sensitivity_store);

static struct device_attribute dev_attr_pointer_press_speed =
	__ATTR(press_speed, S_IWUSR | S_IRUGO,
			pointer_press_speed_show,
			pointer_press_speed_store);

static struct attribute *tpkbd_attributes_pointer[] = {
	&dev_attr_pointer_press_to_select.attr,
	&dev_attr_pointer_dragging.attr,
	&dev_attr_pointer_release_to_select.attr,
	&dev_attr_pointer_select_right.attr,
	&dev_attr_pointer_sensitivity.attr,
	&dev_attr_pointer_press_speed.attr,
	NULL
};

static const struct attribute_group tpkbd_attr_group_pointer = {
	.attrs = tpkbd_attributes_pointer,
};

static enum led_brightness tpkbd_led_brightness_get(
			struct led_classdev *led_cdev)
{
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	int led_nr = 0;

	if (led_cdev == &data_pointer->led_micmute)
		led_nr = 1;

	return data_pointer->led_state & (1 << led_nr)
				? LED_FULL
				: LED_OFF;
}

static void tpkbd_led_brightness_set(struct led_classdev *led_cdev,
			enum led_brightness value)
{
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);
	struct hid_report *report;
	int led_nr = 0;

	if (led_cdev == &data_pointer->led_micmute)
		led_nr = 1;

	if (value == LED_OFF)
		data_pointer->led_state &= ~(1 << led_nr);
	else
		data_pointer->led_state |= 1 << led_nr;

	report = hdev->report_enum[HID_OUTPUT_REPORT].report_id_hash[3];
	report->field[0]->value[0] = (data_pointer->led_state >> 0) & 1;
	report->field[0]->value[1] = (data_pointer->led_state >> 1) & 1;
	usbhid_submit_report(hdev, report, USB_DIR_OUT);
}

static int tpkbd_probe_tp(struct hid_device *hdev)
{
	struct device *dev = &hdev->dev;
	struct tpkbd_data_pointer *data_pointer;
	size_t name_sz = strlen(dev_name(dev)) + 16;
	char *name_mute, *name_micmute;
	int ret;

	if (sysfs_create_group(&hdev->dev.kobj,
				&tpkbd_attr_group_pointer)) {
		hid_warn(hdev, "Could not create sysfs group\n");
	}

	data_pointer = kzalloc(sizeof(struct tpkbd_data_pointer), GFP_KERNEL);
	if (data_pointer == NULL) {
		hid_err(hdev, "Could not allocate memory for driver data\n");
		return -ENOMEM;
	}

	// set same default values as windows driver
	data_pointer->sensitivity = 0xa0;
	data_pointer->press_speed = 0x38;

	name_mute = kzalloc(name_sz, GFP_KERNEL);
	if (name_mute == NULL) {
		hid_err(hdev, "Could not allocate memory for led data\n");
		ret = -ENOMEM;
		goto err;
	}
	snprintf(name_mute, name_sz, "%s:amber:mute", dev_name(dev));

	name_micmute = kzalloc(name_sz, GFP_KERNEL);
	if (name_micmute == NULL) {
		hid_err(hdev, "Could not allocate memory for led data\n");
		ret = -ENOMEM;
		goto err2;
	}
	snprintf(name_micmute, name_sz, "%s:amber:micmute", dev_name(dev));

	hid_set_drvdata(hdev, data_pointer);

	data_pointer->led_mute.name = name_mute;
	data_pointer->led_mute.brightness_get = tpkbd_led_brightness_get;
	data_pointer->led_mute.brightness_set = tpkbd_led_brightness_set;
	data_pointer->led_mute.dev = dev;
	led_classdev_register(dev, &data_pointer->led_mute);

	data_pointer->led_micmute.name = name_micmute;
	data_pointer->led_micmute.brightness_get = tpkbd_led_brightness_get;
	data_pointer->led_micmute.brightness_set = tpkbd_led_brightness_set;
	data_pointer->led_micmute.dev = dev;
	led_classdev_register(dev, &data_pointer->led_micmute);

	tpkbd_features_set(hdev);

	return 0;

err2:
	kfree(name_mute);
err:
	kfree(data_pointer);
	return ret;
}

static int tpkbd_probe(struct hid_device *hdev,
		const struct hid_device_id *id)
{
	int ret;
	struct usbhid_device *uhdev;

	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "hid_parse failed\n");
		goto err_free;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
	if (ret) {
		hid_err(hdev, "hid_hw_start failed\n");
		goto err_free;
	}

	uhdev = (struct usbhid_device *) hdev->driver_data;

	if (uhdev->ifnum == 1)
		return tpkbd_probe_tp(hdev);

	return 0;
err_free:
	return ret;
}

static void tpkbd_remove_tp(struct hid_device *hdev)
{
	struct tpkbd_data_pointer *data_pointer = hid_get_drvdata(hdev);

	sysfs_remove_group(&hdev->dev.kobj,
			&tpkbd_attr_group_pointer);

	led_classdev_unregister(&data_pointer->led_micmute);
	led_classdev_unregister(&data_pointer->led_mute);

	hid_set_drvdata(hdev, NULL);
	kfree(data_pointer->led_micmute.name);
	kfree(data_pointer->led_mute.name);
	kfree(data_pointer);
}

static void tpkbd_remove(struct hid_device *hdev)
{
	struct usbhid_device *uhdev;

	uhdev = (struct usbhid_device *) hdev->driver_data;
	if (uhdev->ifnum == 1)
		tpkbd_remove_tp(hdev);

	hid_hw_stop(hdev);
}

static const struct hid_device_id tpkbd_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_TPKBD) },
	{ }
};

MODULE_DEVICE_TABLE(hid, tpkbd_devices);

static struct hid_driver tpkbd_driver = {
	.name = "lenovo_tpkbd",
	.id_table = tpkbd_devices,
	.input_mapping = tpkbd_input_mapping,
	.probe = tpkbd_probe,
	.remove = tpkbd_remove,
};

static int __init tpkbd_init(void)
{
	return hid_register_driver(&tpkbd_driver);
}

static void __exit tpkbd_exit(void)
{
	hid_unregister_driver(&tpkbd_driver);
}

module_init(tpkbd_init);
module_exit(tpkbd_exit);

MODULE_LICENSE("GPL");