summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/ideapad_slidebar.c
blob: b0acb878d1cf780dc2043ed005706524551625de (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
/*
 * Input driver for slidebars on some Lenovo IdeaPad laptops
 *
 * Copyright (C) 2013 Andrey Moiseev <o2g.org.ru@gmail.com>
 *
 * Reverse-engineered from Lenovo SlideNav software (SBarHook.dll).
 *
 * 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.
 *
 * Trademarks are the property of their respective owners.
 */

/*
 * Currently tested and works on:
 *	Lenovo IdeaPad Y550
 *	Lenovo IdeaPad Y550P
 *
 * Other models can be added easily. To test,
 * load with 'force' parameter set 'true'.
 *
 * LEDs blinking and input mode are managed via sysfs,
 * (hex, unsigned byte value):
 * /sys/devices/platform/ideapad_slidebar/slidebar_mode
 *
 * The value is in byte range, however, I only figured out
 * how bits 0b10011001 work. Some other bits, probably,
 * are meaningfull too.
 *
 * Possible states:
 *
 * STD_INT, ONMOV_INT, OFF_INT, LAST_POLL, OFF_POLL
 *
 * Meaning:
 *           released      touched
 * STD       'heartbeat'   lights follow the finger
 * ONMOV     no lights     lights follow the finger
 * LAST      at last pos   lights follow the finger
 * OFF       no lights     no lights
 *
 * INT       all input events are generated, interrupts are used
 * POLL      no input events by default, to get them,
 *	     send 0b10000000 (read below)
 *
 * Commands: write
 *
 * All      |  0b01001 -> STD_INT
 * possible |  0b10001 -> ONMOV_INT
 * states   |  0b01000 -> OFF_INT
 *
 *                      |  0b0 -> LAST_POLL
 * STD_INT or ONMOV_INT |
 *                      |  0b1 -> STD_INT
 *
 *                      |  0b0 -> OFF_POLL
 * OFF_INT or OFF_POLL  |
 *                      |  0b1 -> OFF_INT
 *
 * Any state |   0b10000000 ->  if the slidebar has updated data,
 *				produce one input event (last position),
 *				switch to respective POLL mode
 *				(like 0x0), if not in POLL mode yet.
 *
 * Get current state: read
 *
 * masked by 0x11 read value means:
 *
 * 0x00   LAST
 * 0x01   STD
 * 0x10   OFF
 * 0x11   ONMOV
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/dmi.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/i8042.h>
#include <linux/serio.h>

#define IDEAPAD_BASE	0xff29

static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");

static DEFINE_SPINLOCK(io_lock);

static struct input_dev *slidebar_input_dev;
static struct platform_device *slidebar_platform_dev;

static u8 slidebar_pos_get(void)
{
	u8 res;
	unsigned long flags;

	spin_lock_irqsave(&io_lock, flags);
	outb(0xf4, 0xff29);
	outb(0xbf, 0xff2a);
	res = inb(0xff2b);
	spin_unlock_irqrestore(&io_lock, flags);

	return res;
}

static u8 slidebar_mode_get(void)
{
	u8 res;
	unsigned long flags;

	spin_lock_irqsave(&io_lock, flags);
	outb(0xf7, 0xff29);
	outb(0x8b, 0xff2a);
	res = inb(0xff2b);
	spin_unlock_irqrestore(&io_lock, flags);

	return res;
}

static void slidebar_mode_set(u8 mode)
{
	unsigned long flags;

	spin_lock_irqsave(&io_lock, flags);
	outb(0xf7, 0xff29);
	outb(0x8b, 0xff2a);
	outb(mode, 0xff2b);
	spin_unlock_irqrestore(&io_lock, flags);
}

static bool slidebar_i8042_filter(unsigned char data, unsigned char str,
				  struct serio *port)
{
	static bool extended = false;

	/* We are only interested in data coming form KBC port */
	if (str & I8042_STR_AUXDATA)
		return false;

	/* Scancodes: e03b on move, e0bb on release. */
	if (data == 0xe0) {
		extended = true;
		return true;
	}

	if (!extended)
		return false;

	extended = false;

	if (likely((data & 0x7f) != 0x3b)) {
		serio_interrupt(port, 0xe0, 0);
		return false;
	}

	if (data & 0x80) {
		input_report_key(slidebar_input_dev, BTN_TOUCH, 0);
	} else {
		input_report_key(slidebar_input_dev, BTN_TOUCH, 1);
		input_report_abs(slidebar_input_dev, ABS_X, slidebar_pos_get());
	}
	input_sync(slidebar_input_dev);

	return true;
}

static ssize_t show_slidebar_mode(struct device *dev,
				  struct device_attribute *attr,
				  char *buf)
{
	return sprintf(buf, "%x\n", slidebar_mode_get());
}

static ssize_t store_slidebar_mode(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	u8 mode;
	int error;

	error = kstrtou8(buf, 0, &mode);
	if (error)
		return error;

	slidebar_mode_set(mode);

	return count;
}

static DEVICE_ATTR(slidebar_mode, S_IWUSR | S_IRUGO,
		   show_slidebar_mode, store_slidebar_mode);

static struct attribute *ideapad_attrs[] = {
	&dev_attr_slidebar_mode.attr,
	NULL
};

static struct attribute_group ideapad_attr_group = {
	.attrs = ideapad_attrs
};

static const struct attribute_group *ideapad_attr_groups[] = {
	&ideapad_attr_group,
	NULL
};

static int __init ideapad_probe(struct platform_device* pdev)
{
	int err;

	if (!request_region(IDEAPAD_BASE, 3, "ideapad_slidebar")) {
		dev_err(&pdev->dev, "IO ports are busy\n");
		return -EBUSY;
	}

	slidebar_input_dev = input_allocate_device();
	if (!slidebar_input_dev) {
		dev_err(&pdev->dev, "Failed to allocate input device\n");
		err = -ENOMEM;
		goto err_release_ports;
	}

	slidebar_input_dev->name = "IdeaPad Slidebar";
	slidebar_input_dev->id.bustype = BUS_HOST;
	slidebar_input_dev->dev.parent = &pdev->dev;
	input_set_capability(slidebar_input_dev, EV_KEY, BTN_TOUCH);
	input_set_capability(slidebar_input_dev, EV_ABS, ABS_X);
	input_set_abs_params(slidebar_input_dev, ABS_X, 0, 0xff, 0, 0);

	err = i8042_install_filter(slidebar_i8042_filter);
	if (err) {
		dev_err(&pdev->dev,
			"Failed to install i8042 filter: %d\n", err);
		goto err_free_dev;
	}

	err = input_register_device(slidebar_input_dev);
	if (err) {
		dev_err(&pdev->dev,
			"Failed to register input device: %d\n", err);
		goto err_remove_filter;
	}

	return 0;

err_remove_filter:
	i8042_remove_filter(slidebar_i8042_filter);
err_free_dev:
	input_free_device(slidebar_input_dev);
err_release_ports:
	release_region(IDEAPAD_BASE, 3);
	return err;
}

static int ideapad_remove(struct platform_device *pdev)
{
	i8042_remove_filter(slidebar_i8042_filter);
	input_unregister_device(slidebar_input_dev);
	release_region(IDEAPAD_BASE, 3);

	return 0;
}

static struct platform_driver slidebar_drv = {
	.driver = {
		.name = "ideapad_slidebar",
	},
	.remove = ideapad_remove,
};

static int __init ideapad_dmi_check(const struct dmi_system_id *id)
{
	pr_info("Laptop model '%s'\n", id->ident);
	return 1;
}

static const struct dmi_system_id ideapad_dmi[] __initconst = {
	{
		.ident = "Lenovo IdeaPad Y550",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
			DMI_MATCH(DMI_PRODUCT_NAME, "20017"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y550")
		},
		.callback = ideapad_dmi_check
	},
	{
		.ident = "Lenovo IdeaPad Y550P",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
			DMI_MATCH(DMI_PRODUCT_NAME, "20035"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y550P")
		},
		.callback = ideapad_dmi_check
	},
	{ NULL, }
};
MODULE_DEVICE_TABLE(dmi, ideapad_dmi);

static int __init slidebar_init(void)
{
	int err;

	if (!force && !dmi_check_system(ideapad_dmi)) {
		pr_err("DMI does not match\n");
		return -ENODEV;
	}

	slidebar_platform_dev = platform_device_alloc("ideapad_slidebar", -1);
	if (!slidebar_platform_dev) {
		pr_err("Not enough memory\n");
		return -ENOMEM;
	}

	slidebar_platform_dev->dev.groups = ideapad_attr_groups;

	err = platform_device_add(slidebar_platform_dev);
	if (err) {
		pr_err("Failed to register platform device\n");
		goto err_free_dev;
	}

	err = platform_driver_probe(&slidebar_drv, ideapad_probe);
	if (err) {
		pr_err("Failed to register platform driver\n");
		goto err_delete_dev;
	}

	return 0;

err_delete_dev:
	platform_device_del(slidebar_platform_dev);
err_free_dev:
	platform_device_put(slidebar_platform_dev);
	return err;
}

static void __exit slidebar_exit(void)
{
	platform_device_unregister(slidebar_platform_dev);
	platform_driver_unregister(&slidebar_drv);
}

module_init(slidebar_init);
module_exit(slidebar_exit);

MODULE_AUTHOR("Andrey Moiseev <o2g.org.ru@gmail.com>");
MODULE_DESCRIPTION("Slidebar input support for some Lenovo IdeaPad laptops");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud