summaryrefslogtreecommitdiffstats
path: root/drivers/platform/x86/intel-vbtn.c
blob: 888a764efad1ac1b42527c4e457c1262e836c6a7 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 *  Intel Virtual Button driver for Windows 8.1+
 *
 *  Copyright (C) 2016 AceLan Kao <acelan.kao@canonical.com>
 *  Copyright (C) 2016 Alex Hung <alex.hung@canonical.com>
 */

#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/suspend.h>

/* Returned when NOT in tablet mode on some HP Stream x360 11 models */
#define VGBS_TABLET_MODE_FLAG_ALT	0x10
/* When NOT in tablet mode, VGBS returns with the flag 0x40 */
#define VGBS_TABLET_MODE_FLAG		0x40
#define VGBS_DOCK_MODE_FLAG		0x80

#define VGBS_TABLET_MODE_FLAGS (VGBS_TABLET_MODE_FLAG | VGBS_TABLET_MODE_FLAG_ALT)

MODULE_LICENSE("GPL");
MODULE_AUTHOR("AceLan Kao");

static const struct acpi_device_id intel_vbtn_ids[] = {
	{"INT33D6", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, intel_vbtn_ids);

/* In theory, these are HID usages. */
static const struct key_entry intel_vbtn_keymap[] = {
	{ KE_KEY, 0xC0, { KEY_POWER } },	/* power key press */
	{ KE_IGNORE, 0xC1, { KEY_POWER } },	/* power key release */
	{ KE_KEY, 0xC2, { KEY_LEFTMETA } },		/* 'Windows' key press */
	{ KE_KEY, 0xC3, { KEY_LEFTMETA } },		/* 'Windows' key release */
	{ KE_KEY, 0xC4, { KEY_VOLUMEUP } },		/* volume-up key press */
	{ KE_IGNORE, 0xC5, { KEY_VOLUMEUP } },		/* volume-up key release */
	{ KE_KEY, 0xC6, { KEY_VOLUMEDOWN } },		/* volume-down key press */
	{ KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } },	/* volume-down key release */
	{ KE_KEY,    0xC8, { KEY_ROTATE_LOCK_TOGGLE } },	/* rotate-lock key press */
	{ KE_KEY,    0xC9, { KEY_ROTATE_LOCK_TOGGLE } },	/* rotate-lock key release */
	{ KE_END }
};

static const struct key_entry intel_vbtn_switchmap[] = {
	/*
	 * SW_DOCK should only be reported for docking stations, but DSDTs using the
	 * intel-vbtn code, always seem to use this for 2-in-1s / convertibles and set
	 * SW_DOCK=1 when in laptop-mode (in tandem with setting SW_TABLET_MODE=0).
	 * This causes userspace to think the laptop is docked to a port-replicator
	 * and to disable suspend-on-lid-close, which is undesirable.
	 * Map the dock events to KEY_IGNORE to avoid this broken SW_DOCK reporting.
	 */
	{ KE_IGNORE, 0xCA, { .sw = { SW_DOCK, 1 } } },		/* Docked */
	{ KE_IGNORE, 0xCB, { .sw = { SW_DOCK, 0 } } },		/* Undocked */
	{ KE_SW,     0xCC, { .sw = { SW_TABLET_MODE, 1 } } },	/* Tablet */
	{ KE_SW,     0xCD, { .sw = { SW_TABLET_MODE, 0 } } },	/* Laptop */
	{ KE_END }
};

struct intel_vbtn_priv {
	struct input_dev *buttons_dev;
	struct input_dev *switches_dev;
	bool has_buttons;
	bool has_switches;
	bool wakeup_mode;
};

static void detect_tablet_mode(struct platform_device *device)
{
	struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
	acpi_handle handle = ACPI_HANDLE(&device->dev);
	unsigned long long vgbs;
	acpi_status status;
	int m;

	status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs);
	if (ACPI_FAILURE(status))
		return;

	m = !(vgbs & VGBS_TABLET_MODE_FLAGS);
	input_report_switch(priv->switches_dev, SW_TABLET_MODE, m);
	m = (vgbs & VGBS_DOCK_MODE_FLAG) ? 1 : 0;
	input_report_switch(priv->switches_dev, SW_DOCK, m);
}

/*
 * Note this unconditionally creates the 2 input_dev-s and sets up
 * the sparse-keymaps. Only the registration is conditional on
 * have_buttons / have_switches. This is done so that the notify
 * handler can always call sparse_keymap_entry_from_scancode()
 * on the input_dev-s do determine the event type.
 */
static int intel_vbtn_input_setup(struct platform_device *device)
{
	struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
	int ret;

	priv->buttons_dev = devm_input_allocate_device(&device->dev);
	if (!priv->buttons_dev)
		return -ENOMEM;

	ret = sparse_keymap_setup(priv->buttons_dev, intel_vbtn_keymap, NULL);
	if (ret)
		return ret;

	priv->buttons_dev->dev.parent = &device->dev;
	priv->buttons_dev->name = "Intel Virtual Buttons";
	priv->buttons_dev->id.bustype = BUS_HOST;

	if (priv->has_buttons) {
		ret = input_register_device(priv->buttons_dev);
		if (ret)
			return ret;
	}

	priv->switches_dev = devm_input_allocate_device(&device->dev);
	if (!priv->switches_dev)
		return -ENOMEM;

	ret = sparse_keymap_setup(priv->switches_dev, intel_vbtn_switchmap, NULL);
	if (ret)
		return ret;

	priv->switches_dev->dev.parent = &device->dev;
	priv->switches_dev->name = "Intel Virtual Switches";
	priv->switches_dev->id.bustype = BUS_HOST;

	if (priv->has_switches) {
		detect_tablet_mode(device);

		ret = input_register_device(priv->switches_dev);
		if (ret)
			return ret;
	}

	return 0;
}

static void notify_handler(acpi_handle handle, u32 event, void *context)
{
	struct platform_device *device = context;
	struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
	unsigned int val = !(event & 1); /* Even=press, Odd=release */
	const struct key_entry *ke, *ke_rel;
	struct input_dev *input_dev;
	bool autorelease;
	int ret;

	if ((ke = sparse_keymap_entry_from_scancode(priv->buttons_dev, event))) {
		if (!priv->has_buttons) {
			dev_warn(&device->dev, "Warning: received a button event on a device without buttons, please report this.\n");
			return;
		}
		input_dev = priv->buttons_dev;
	} else if ((ke = sparse_keymap_entry_from_scancode(priv->switches_dev, event))) {
		if (!priv->has_switches) {
			dev_info(&device->dev, "Registering Intel Virtual Switches input-dev after receiving a switch event\n");
			ret = input_register_device(priv->switches_dev);
			if (ret)
				return;

			priv->has_switches = true;
		}
		input_dev = priv->switches_dev;
	} else {
		dev_dbg(&device->dev, "unknown event index 0x%x\n", event);
		return;
	}

	if (priv->wakeup_mode) {
		pm_wakeup_hard_event(&device->dev);

		/*
		 * Skip reporting an evdev event for button wake events,
		 * mirroring how the drivers/acpi/button.c code skips this too.
		 */
		if (ke->type == KE_KEY)
			return;
	}

	/*
	 * Even press events are autorelease if there is no corresponding odd
	 * release event, or if the odd event is KE_IGNORE.
	 */
	ke_rel = sparse_keymap_entry_from_scancode(input_dev, event | 1);
	autorelease = val && (!ke_rel || ke_rel->type == KE_IGNORE);

	sparse_keymap_report_event(input_dev, event, val, autorelease);
}

/*
 * There are several laptops (non 2-in-1) models out there which support VGBS,
 * but simply always return 0, which we translate to SW_TABLET_MODE=1. This in
 * turn causes userspace (libinput) to suppress events from the builtin
 * keyboard and touchpad, making the laptop essentially unusable.
 *
 * Since the problem of wrongly reporting SW_TABLET_MODE=1 in combination
 * with libinput, leads to a non-usable system. Where as OTOH many people will
 * not even notice when SW_TABLET_MODE is not being reported, a DMI based allow
 * list is used here. This list mainly matches on the chassis-type of 2-in-1s.
 *
 * There are also some 2-in-1s which use the intel-vbtn ACPI interface to report
 * SW_TABLET_MODE with a chassis-type of 8 ("Portable") or 10 ("Notebook"),
 * these are matched on a per model basis, since many normal laptops with a
 * possible broken VGBS ACPI-method also use these chassis-types.
 */
static const struct dmi_system_id dmi_switches_allow_list[] = {
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */),
		},
	},
	{
		.matches = {
			DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */),
		},
	},
	{
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7130"),
		},
	},
	{
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
			DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion 13 x360 PC"),
		},
	},
	{
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Switch SA5-271"),
		},
	},
	{
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7352"),
		},
	},
	{} /* Array terminator */
};

static bool intel_vbtn_has_switches(acpi_handle handle)
{
	unsigned long long vgbs;
	acpi_status status;

	if (!dmi_check_system(dmi_switches_allow_list))
		return false;

	status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs);
	return ACPI_SUCCESS(status);
}

static int intel_vbtn_probe(struct platform_device *device)
{
	acpi_handle handle = ACPI_HANDLE(&device->dev);
	bool has_buttons, has_switches;
	struct intel_vbtn_priv *priv;
	acpi_status status;
	int err;

	has_buttons = acpi_has_method(handle, "VBDL");
	has_switches = intel_vbtn_has_switches(handle);

	if (!has_buttons && !has_switches) {
		dev_warn(&device->dev, "failed to read Intel Virtual Button driver\n");
		return -ENODEV;
	}

	priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;
	dev_set_drvdata(&device->dev, priv);

	priv->has_buttons = has_buttons;
	priv->has_switches = has_switches;

	err = intel_vbtn_input_setup(device);
	if (err) {
		pr_err("Failed to setup Intel Virtual Button\n");
		return err;
	}

	status = acpi_install_notify_handler(handle,
					     ACPI_DEVICE_NOTIFY,
					     notify_handler,
					     device);
	if (ACPI_FAILURE(status))
		return -EBUSY;

	if (has_buttons) {
		status = acpi_evaluate_object(handle, "VBDL", NULL, NULL);
		if (ACPI_FAILURE(status))
			dev_err(&device->dev, "Error VBDL failed with ACPI status %d\n", status);
	}

	device_init_wakeup(&device->dev, true);
	/*
	 * In order for system wakeup to work, the EC GPE has to be marked as
	 * a wakeup one, so do that here (this setting will persist, but it has
	 * no effect until the wakeup mask is set for the EC GPE).
	 */
	acpi_ec_mark_gpe_for_wake();
	return 0;
}

static int intel_vbtn_remove(struct platform_device *device)
{
	acpi_handle handle = ACPI_HANDLE(&device->dev);

	device_init_wakeup(&device->dev, false);
	acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);

	/*
	 * Even if we failed to shut off the event stream, we can still
	 * safely detach from the device.
	 */
	return 0;
}

static int intel_vbtn_pm_prepare(struct device *dev)
{
	if (device_may_wakeup(dev)) {
		struct intel_vbtn_priv *priv = dev_get_drvdata(dev);

		priv->wakeup_mode = true;
	}
	return 0;
}

static void intel_vbtn_pm_complete(struct device *dev)
{
	struct intel_vbtn_priv *priv = dev_get_drvdata(dev);

	priv->wakeup_mode = false;
}

static int intel_vbtn_pm_resume(struct device *dev)
{
	intel_vbtn_pm_complete(dev);
	return 0;
}

static const struct dev_pm_ops intel_vbtn_pm_ops = {
	.prepare = intel_vbtn_pm_prepare,
	.complete = intel_vbtn_pm_complete,
	.resume = intel_vbtn_pm_resume,
	.restore = intel_vbtn_pm_resume,
	.thaw = intel_vbtn_pm_resume,
};

static struct platform_driver intel_vbtn_pl_driver = {
	.driver = {
		.name = "intel-vbtn",
		.acpi_match_table = intel_vbtn_ids,
		.pm = &intel_vbtn_pm_ops,
	},
	.probe = intel_vbtn_probe,
	.remove = intel_vbtn_remove,
};

static acpi_status __init
check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	const struct acpi_device_id *ids = context;
	struct acpi_device *dev;

	if (acpi_bus_get_device(handle, &dev) != 0)
		return AE_OK;

	if (acpi_match_device_ids(dev, ids) == 0)
		if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL)))
			dev_info(&dev->dev,
				 "intel-vbtn: created platform device\n");

	return AE_OK;
}

static int __init intel_vbtn_init(void)
{
	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
			    ACPI_UINT32_MAX, check_acpi_dev, NULL,
			    (void *)intel_vbtn_ids, NULL);

	return platform_driver_register(&intel_vbtn_pl_driver);
}
module_init(intel_vbtn_init);

static void __exit intel_vbtn_exit(void)
{
	platform_driver_unregister(&intel_vbtn_pl_driver);
}
module_exit(intel_vbtn_exit);