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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Intel Virtual Button driver for Windows 8.1+
4 *
5 * Copyright (C) 2016 AceLan Kao <acelan.kao@canonical.com>
6 * Copyright (C) 2016 Alex Hung <alex.hung@canonical.com>
7 */
8
9#include <linux/acpi.h>
10#include <linux/dmi.h>
11#include <linux/input.h>
12#include <linux/input/sparse-keymap.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/suspend.h>
17#include "../dual_accel_detect.h"
18
19/* Returned when NOT in tablet mode on some HP Stream x360 11 models */
20#define VGBS_TABLET_MODE_FLAG_ALT 0x10
21/* When NOT in tablet mode, VGBS returns with the flag 0x40 */
22#define VGBS_TABLET_MODE_FLAG 0x40
23#define VGBS_DOCK_MODE_FLAG 0x80
24
25#define VGBS_TABLET_MODE_FLAGS (VGBS_TABLET_MODE_FLAG | VGBS_TABLET_MODE_FLAG_ALT)
26
27MODULE_LICENSE("GPL");
28MODULE_AUTHOR("AceLan Kao");
29
30static const struct acpi_device_id intel_vbtn_ids[] = {
31 {"INT33D6", 0},
32 {"", 0},
33};
34MODULE_DEVICE_TABLE(acpi, intel_vbtn_ids);
35
36/* In theory, these are HID usages. */
37static const struct key_entry intel_vbtn_keymap[] = {
38 { KE_KEY, 0xC0, { KEY_POWER } }, /* power key press */
39 { KE_IGNORE, 0xC1, { KEY_POWER } }, /* power key release */
40 { KE_KEY, 0xC2, { KEY_LEFTMETA } }, /* 'Windows' key press */
41 { KE_KEY, 0xC3, { KEY_LEFTMETA } }, /* 'Windows' key release */
42 { KE_KEY, 0xC4, { KEY_VOLUMEUP } }, /* volume-up key press */
43 { KE_IGNORE, 0xC5, { KEY_VOLUMEUP } }, /* volume-up key release */
44 { KE_KEY, 0xC6, { KEY_VOLUMEDOWN } }, /* volume-down key press */
45 { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* volume-down key release */
46 { KE_KEY, 0xC8, { KEY_ROTATE_LOCK_TOGGLE } }, /* rotate-lock key press */
47 { KE_KEY, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } }, /* rotate-lock key release */
48 { KE_END }
49};
50
51static const struct key_entry intel_vbtn_switchmap[] = {
52 /*
53 * SW_DOCK should only be reported for docking stations, but DSDTs using the
54 * intel-vbtn code, always seem to use this for 2-in-1s / convertibles and set
55 * SW_DOCK=1 when in laptop-mode (in tandem with setting SW_TABLET_MODE=0).
56 * This causes userspace to think the laptop is docked to a port-replicator
57 * and to disable suspend-on-lid-close, which is undesirable.
58 * Map the dock events to KEY_IGNORE to avoid this broken SW_DOCK reporting.
59 */
60 { KE_IGNORE, 0xCA, { .sw = { SW_DOCK, 1 } } }, /* Docked */
61 { KE_IGNORE, 0xCB, { .sw = { SW_DOCK, 0 } } }, /* Undocked */
62 { KE_SW, 0xCC, { .sw = { SW_TABLET_MODE, 1 } } }, /* Tablet */
63 { KE_SW, 0xCD, { .sw = { SW_TABLET_MODE, 0 } } }, /* Laptop */
64 { KE_END }
65};
66
67struct intel_vbtn_priv {
68 struct input_dev *buttons_dev;
69 struct input_dev *switches_dev;
70 bool dual_accel;
71 bool has_buttons;
72 bool has_switches;
73 bool wakeup_mode;
74};
75
76static void detect_tablet_mode(struct platform_device *device)
77{
78 struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
79 acpi_handle handle = ACPI_HANDLE(&device->dev);
80 unsigned long long vgbs;
81 acpi_status status;
82 int m;
83
84 status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs);
85 if (ACPI_FAILURE(status))
86 return;
87
88 m = !(vgbs & VGBS_TABLET_MODE_FLAGS);
89 input_report_switch(priv->switches_dev, SW_TABLET_MODE, m);
90 m = (vgbs & VGBS_DOCK_MODE_FLAG) ? 1 : 0;
91 input_report_switch(priv->switches_dev, SW_DOCK, m);
92}
93
94/*
95 * Note this unconditionally creates the 2 input_dev-s and sets up
96 * the sparse-keymaps. Only the registration is conditional on
97 * have_buttons / have_switches. This is done so that the notify
98 * handler can always call sparse_keymap_entry_from_scancode()
99 * on the input_dev-s do determine the event type.
100 */
101static int intel_vbtn_input_setup(struct platform_device *device)
102{
103 struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
104 int ret;
105
106 priv->buttons_dev = devm_input_allocate_device(&device->dev);
107 if (!priv->buttons_dev)
108 return -ENOMEM;
109
110 ret = sparse_keymap_setup(priv->buttons_dev, intel_vbtn_keymap, NULL);
111 if (ret)
112 return ret;
113
114 priv->buttons_dev->dev.parent = &device->dev;
115 priv->buttons_dev->name = "Intel Virtual Buttons";
116 priv->buttons_dev->id.bustype = BUS_HOST;
117
118 if (priv->has_buttons) {
119 ret = input_register_device(priv->buttons_dev);
120 if (ret)
121 return ret;
122 }
123
124 priv->switches_dev = devm_input_allocate_device(&device->dev);
125 if (!priv->switches_dev)
126 return -ENOMEM;
127
128 ret = sparse_keymap_setup(priv->switches_dev, intel_vbtn_switchmap, NULL);
129 if (ret)
130 return ret;
131
132 priv->switches_dev->dev.parent = &device->dev;
133 priv->switches_dev->name = "Intel Virtual Switches";
134 priv->switches_dev->id.bustype = BUS_HOST;
135
136 if (priv->has_switches) {
137 detect_tablet_mode(device);
138
139 ret = input_register_device(priv->switches_dev);
140 if (ret)
141 return ret;
142 }
143
144 return 0;
145}
146
147static void notify_handler(acpi_handle handle, u32 event, void *context)
148{
149 struct platform_device *device = context;
150 struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
151 unsigned int val = !(event & 1); /* Even=press, Odd=release */
152 const struct key_entry *ke, *ke_rel;
153 struct input_dev *input_dev;
154 bool autorelease;
155 int ret;
156
157 if ((ke = sparse_keymap_entry_from_scancode(priv->buttons_dev, event))) {
158 if (!priv->has_buttons) {
159 dev_warn(&device->dev, "Warning: received a button event on a device without buttons, please report this.\n");
160 return;
161 }
162 input_dev = priv->buttons_dev;
163 } else if ((ke = sparse_keymap_entry_from_scancode(priv->switches_dev, event))) {
164 if (!priv->has_switches) {
165 /* See dual_accel_detect.h for more info */
166 if (priv->dual_accel)
167 return;
168
169 dev_info(&device->dev, "Registering Intel Virtual Switches input-dev after receiving a switch event\n");
170 ret = input_register_device(priv->switches_dev);
171 if (ret)
172 return;
173
174 priv->has_switches = true;
175 }
176 input_dev = priv->switches_dev;
177 } else {
178 dev_dbg(&device->dev, "unknown event index 0x%x\n", event);
179 return;
180 }
181
182 if (priv->wakeup_mode) {
183 pm_wakeup_hard_event(&device->dev);
184
185 /*
186 * Skip reporting an evdev event for button wake events,
187 * mirroring how the drivers/acpi/button.c code skips this too.
188 */
189 if (ke->type == KE_KEY)
190 return;
191 }
192
193 /*
194 * Even press events are autorelease if there is no corresponding odd
195 * release event, or if the odd event is KE_IGNORE.
196 */
197 ke_rel = sparse_keymap_entry_from_scancode(input_dev, event | 1);
198 autorelease = val && (!ke_rel || ke_rel->type == KE_IGNORE);
199
200 sparse_keymap_report_event(input_dev, event, val, autorelease);
201}
202
203/*
204 * There are several laptops (non 2-in-1) models out there which support VGBS,
205 * but simply always return 0, which we translate to SW_TABLET_MODE=1. This in
206 * turn causes userspace (libinput) to suppress events from the builtin
207 * keyboard and touchpad, making the laptop essentially unusable.
208 *
209 * Since the problem of wrongly reporting SW_TABLET_MODE=1 in combination
210 * with libinput, leads to a non-usable system. Where as OTOH many people will
211 * not even notice when SW_TABLET_MODE is not being reported, a DMI based allow
212 * list is used here. This list mainly matches on the chassis-type of 2-in-1s.
213 *
214 * There are also some 2-in-1s which use the intel-vbtn ACPI interface to report
215 * SW_TABLET_MODE with a chassis-type of 8 ("Portable") or 10 ("Notebook"),
216 * these are matched on a per model basis, since many normal laptops with a
217 * possible broken VGBS ACPI-method also use these chassis-types.
218 */
219static const struct dmi_system_id dmi_switches_allow_list[] = {
220 {
221 .matches = {
222 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */),
223 },
224 },
225 {
226 .matches = {
227 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */),
228 },
229 },
230 {
231 .matches = {
232 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
233 DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7130"),
234 },
235 },
236 {
237 .matches = {
238 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
239 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion 13 x360 PC"),
240 },
241 },
242 {
243 .matches = {
244 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
245 DMI_MATCH(DMI_PRODUCT_NAME, "Switch SA5-271"),
246 },
247 },
248 {
249 .matches = {
250 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
251 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7352"),
252 },
253 },
254 {} /* Array terminator */
255};
256
257static bool intel_vbtn_has_switches(acpi_handle handle, bool dual_accel)
258{
259 unsigned long long vgbs;
260 acpi_status status;
261
262 /* See dual_accel_detect.h for more info */
263 if (dual_accel)
264 return false;
265
266 if (!dmi_check_system(dmi_switches_allow_list))
267 return false;
268
269 status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs);
270 return ACPI_SUCCESS(status);
271}
272
273static int intel_vbtn_probe(struct platform_device *device)
274{
275 acpi_handle handle = ACPI_HANDLE(&device->dev);
276 bool dual_accel, has_buttons, has_switches;
277 struct intel_vbtn_priv *priv;
278 acpi_status status;
279 int err;
280
281 dual_accel = dual_accel_detect();
282 has_buttons = acpi_has_method(handle, "VBDL");
283 has_switches = intel_vbtn_has_switches(handle, dual_accel);
284
285 if (!has_buttons && !has_switches) {
286 dev_warn(&device->dev, "failed to read Intel Virtual Button driver\n");
287 return -ENODEV;
288 }
289
290 priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
291 if (!priv)
292 return -ENOMEM;
293 dev_set_drvdata(&device->dev, priv);
294
295 priv->dual_accel = dual_accel;
296 priv->has_buttons = has_buttons;
297 priv->has_switches = has_switches;
298
299 err = intel_vbtn_input_setup(device);
300 if (err) {
301 pr_err("Failed to setup Intel Virtual Button\n");
302 return err;
303 }
304
305 status = acpi_install_notify_handler(handle,
306 ACPI_DEVICE_NOTIFY,
307 notify_handler,
308 device);
309 if (ACPI_FAILURE(status))
310 return -EBUSY;
311
312 if (has_buttons) {
313 status = acpi_evaluate_object(handle, "VBDL", NULL, NULL);
314 if (ACPI_FAILURE(status))
315 dev_err(&device->dev, "Error VBDL failed with ACPI status %d\n", status);
316 }
317
318 device_init_wakeup(&device->dev, true);
319 /*
320 * In order for system wakeup to work, the EC GPE has to be marked as
321 * a wakeup one, so do that here (this setting will persist, but it has
322 * no effect until the wakeup mask is set for the EC GPE).
323 */
324 acpi_ec_mark_gpe_for_wake();
325 return 0;
326}
327
328static int intel_vbtn_remove(struct platform_device *device)
329{
330 acpi_handle handle = ACPI_HANDLE(&device->dev);
331
332 device_init_wakeup(&device->dev, false);
333 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
334
335 /*
336 * Even if we failed to shut off the event stream, we can still
337 * safely detach from the device.
338 */
339 return 0;
340}
341
342static int intel_vbtn_pm_prepare(struct device *dev)
343{
344 if (device_may_wakeup(dev)) {
345 struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
346
347 priv->wakeup_mode = true;
348 }
349 return 0;
350}
351
352static void intel_vbtn_pm_complete(struct device *dev)
353{
354 struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
355
356 priv->wakeup_mode = false;
357}
358
359static int intel_vbtn_pm_resume(struct device *dev)
360{
361 intel_vbtn_pm_complete(dev);
362 return 0;
363}
364
365static const struct dev_pm_ops intel_vbtn_pm_ops = {
366 .prepare = intel_vbtn_pm_prepare,
367 .complete = intel_vbtn_pm_complete,
368 .resume = intel_vbtn_pm_resume,
369 .restore = intel_vbtn_pm_resume,
370 .thaw = intel_vbtn_pm_resume,
371};
372
373static struct platform_driver intel_vbtn_pl_driver = {
374 .driver = {
375 .name = "intel-vbtn",
376 .acpi_match_table = intel_vbtn_ids,
377 .pm = &intel_vbtn_pm_ops,
378 },
379 .probe = intel_vbtn_probe,
380 .remove = intel_vbtn_remove,
381};
382
383static acpi_status __init
384check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
385{
386 const struct acpi_device_id *ids = context;
387 struct acpi_device *dev = acpi_fetch_acpi_dev(handle);
388
389 if (dev && acpi_match_device_ids(dev, ids) == 0)
390 if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL)))
391 dev_info(&dev->dev,
392 "intel-vbtn: created platform device\n");
393
394 return AE_OK;
395}
396
397static int __init intel_vbtn_init(void)
398{
399 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
400 ACPI_UINT32_MAX, check_acpi_dev, NULL,
401 (void *)intel_vbtn_ids, NULL);
402
403 return platform_driver_register(&intel_vbtn_pl_driver);
404}
405module_init(intel_vbtn_init);
406
407static void __exit intel_vbtn_exit(void)
408{
409 platform_driver_unregister(&intel_vbtn_pl_driver);
410}
411module_exit(intel_vbtn_exit);