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 27 MODULE_LICENSE("GPL"); 28 MODULE_AUTHOR("AceLan Kao"); 29 30 static const struct acpi_device_id intel_vbtn_ids[] = { 31 {"INT33D6", 0}, 32 {"", 0}, 33 }; 34 MODULE_DEVICE_TABLE(acpi, intel_vbtn_ids); 35 36 /* In theory, these are HID usages. */ 37 static 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 51 static 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 67 struct 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 76 static void detect_tablet_mode(struct device *dev) 77 { 78 struct intel_vbtn_priv *priv = dev_get_drvdata(dev); 79 acpi_handle handle = ACPI_HANDLE(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 input_sync(priv->switches_dev); 94 } 95 96 /* 97 * Note this unconditionally creates the 2 input_dev-s and sets up 98 * the sparse-keymaps. Only the registration is conditional on 99 * have_buttons / have_switches. This is done so that the notify 100 * handler can always call sparse_keymap_entry_from_scancode() 101 * on the input_dev-s do determine the event type. 102 */ 103 static int intel_vbtn_input_setup(struct platform_device *device) 104 { 105 struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); 106 int ret; 107 108 priv->buttons_dev = devm_input_allocate_device(&device->dev); 109 if (!priv->buttons_dev) 110 return -ENOMEM; 111 112 ret = sparse_keymap_setup(priv->buttons_dev, intel_vbtn_keymap, NULL); 113 if (ret) 114 return ret; 115 116 priv->buttons_dev->dev.parent = &device->dev; 117 priv->buttons_dev->name = "Intel Virtual Buttons"; 118 priv->buttons_dev->id.bustype = BUS_HOST; 119 120 if (priv->has_buttons) { 121 ret = input_register_device(priv->buttons_dev); 122 if (ret) 123 return ret; 124 } 125 126 priv->switches_dev = devm_input_allocate_device(&device->dev); 127 if (!priv->switches_dev) 128 return -ENOMEM; 129 130 ret = sparse_keymap_setup(priv->switches_dev, intel_vbtn_switchmap, NULL); 131 if (ret) 132 return ret; 133 134 priv->switches_dev->dev.parent = &device->dev; 135 priv->switches_dev->name = "Intel Virtual Switches"; 136 priv->switches_dev->id.bustype = BUS_HOST; 137 138 if (priv->has_switches) { 139 detect_tablet_mode(&device->dev); 140 141 ret = input_register_device(priv->switches_dev); 142 if (ret) 143 return ret; 144 } 145 146 return 0; 147 } 148 149 static void notify_handler(acpi_handle handle, u32 event, void *context) 150 { 151 struct platform_device *device = context; 152 struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); 153 unsigned int val = !(event & 1); /* Even=press, Odd=release */ 154 const struct key_entry *ke, *ke_rel; 155 struct input_dev *input_dev; 156 bool autorelease; 157 int ret; 158 159 if ((ke = sparse_keymap_entry_from_scancode(priv->buttons_dev, event))) { 160 if (!priv->has_buttons) { 161 dev_warn(&device->dev, "Warning: received a button event on a device without buttons, please report this.\n"); 162 return; 163 } 164 input_dev = priv->buttons_dev; 165 } else if ((ke = sparse_keymap_entry_from_scancode(priv->switches_dev, event))) { 166 if (!priv->has_switches) { 167 /* See dual_accel_detect.h for more info */ 168 if (priv->dual_accel) 169 return; 170 171 dev_info(&device->dev, "Registering Intel Virtual Switches input-dev after receiving a switch event\n"); 172 ret = input_register_device(priv->switches_dev); 173 if (ret) 174 return; 175 176 priv->has_switches = true; 177 } 178 input_dev = priv->switches_dev; 179 } else { 180 dev_dbg(&device->dev, "unknown event index 0x%x\n", event); 181 return; 182 } 183 184 if (priv->wakeup_mode) { 185 pm_wakeup_hard_event(&device->dev); 186 187 /* 188 * Skip reporting an evdev event for button wake events, 189 * mirroring how the drivers/acpi/button.c code skips this too. 190 */ 191 if (ke->type == KE_KEY) 192 return; 193 } 194 195 /* 196 * Even press events are autorelease if there is no corresponding odd 197 * release event, or if the odd event is KE_IGNORE. 198 */ 199 ke_rel = sparse_keymap_entry_from_scancode(input_dev, event | 1); 200 autorelease = val && (!ke_rel || ke_rel->type == KE_IGNORE); 201 202 sparse_keymap_report_event(input_dev, event, val, autorelease); 203 } 204 205 /* 206 * There are several laptops (non 2-in-1) models out there which support VGBS, 207 * but simply always return 0, which we translate to SW_TABLET_MODE=1. This in 208 * turn causes userspace (libinput) to suppress events from the builtin 209 * keyboard and touchpad, making the laptop essentially unusable. 210 * 211 * Since the problem of wrongly reporting SW_TABLET_MODE=1 in combination 212 * with libinput, leads to a non-usable system. Where as OTOH many people will 213 * not even notice when SW_TABLET_MODE is not being reported, a DMI based allow 214 * list is used here. This list mainly matches on the chassis-type of 2-in-1s. 215 * 216 * There are also some 2-in-1s which use the intel-vbtn ACPI interface to report 217 * SW_TABLET_MODE with a chassis-type of 8 ("Portable") or 10 ("Notebook"), 218 * these are matched on a per model basis, since many normal laptops with a 219 * possible broken VGBS ACPI-method also use these chassis-types. 220 */ 221 static const struct dmi_system_id dmi_switches_allow_list[] = { 222 { 223 .matches = { 224 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */), 225 }, 226 }, 227 { 228 .matches = { 229 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */), 230 }, 231 }, 232 { 233 .matches = { 234 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 235 DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7130"), 236 }, 237 }, 238 { 239 .matches = { 240 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 241 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion 13 x360 PC"), 242 }, 243 }, 244 { 245 .matches = { 246 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 247 DMI_MATCH(DMI_PRODUCT_NAME, "Switch SA5-271"), 248 }, 249 }, 250 { 251 .matches = { 252 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 253 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7352"), 254 }, 255 }, 256 {} /* Array terminator */ 257 }; 258 259 static bool intel_vbtn_has_switches(acpi_handle handle, bool dual_accel) 260 { 261 unsigned long long vgbs; 262 acpi_status status; 263 264 /* See dual_accel_detect.h for more info */ 265 if (dual_accel) 266 return false; 267 268 if (!dmi_check_system(dmi_switches_allow_list)) 269 return false; 270 271 status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs); 272 return ACPI_SUCCESS(status); 273 } 274 275 static int intel_vbtn_probe(struct platform_device *device) 276 { 277 acpi_handle handle = ACPI_HANDLE(&device->dev); 278 bool dual_accel, has_buttons, has_switches; 279 struct intel_vbtn_priv *priv; 280 acpi_status status; 281 int err; 282 283 dual_accel = dual_accel_detect(); 284 has_buttons = acpi_has_method(handle, "VBDL"); 285 has_switches = intel_vbtn_has_switches(handle, dual_accel); 286 287 if (!has_buttons && !has_switches) { 288 dev_warn(&device->dev, "failed to read Intel Virtual Button driver\n"); 289 return -ENODEV; 290 } 291 292 priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL); 293 if (!priv) 294 return -ENOMEM; 295 dev_set_drvdata(&device->dev, priv); 296 297 priv->dual_accel = dual_accel; 298 priv->has_buttons = has_buttons; 299 priv->has_switches = has_switches; 300 301 err = intel_vbtn_input_setup(device); 302 if (err) { 303 pr_err("Failed to setup Intel Virtual Button\n"); 304 return err; 305 } 306 307 status = acpi_install_notify_handler(handle, 308 ACPI_DEVICE_NOTIFY, 309 notify_handler, 310 device); 311 if (ACPI_FAILURE(status)) 312 return -EBUSY; 313 314 if (has_buttons) { 315 status = acpi_evaluate_object(handle, "VBDL", NULL, NULL); 316 if (ACPI_FAILURE(status)) 317 dev_err(&device->dev, "Error VBDL failed with ACPI status %d\n", status); 318 } 319 320 device_init_wakeup(&device->dev, true); 321 /* 322 * In order for system wakeup to work, the EC GPE has to be marked as 323 * a wakeup one, so do that here (this setting will persist, but it has 324 * no effect until the wakeup mask is set for the EC GPE). 325 */ 326 acpi_ec_mark_gpe_for_wake(); 327 return 0; 328 } 329 330 static void intel_vbtn_remove(struct platform_device *device) 331 { 332 acpi_handle handle = ACPI_HANDLE(&device->dev); 333 334 device_init_wakeup(&device->dev, false); 335 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler); 336 } 337 338 static int intel_vbtn_pm_prepare(struct device *dev) 339 { 340 if (device_may_wakeup(dev)) { 341 struct intel_vbtn_priv *priv = dev_get_drvdata(dev); 342 343 priv->wakeup_mode = true; 344 } 345 return 0; 346 } 347 348 static void intel_vbtn_pm_complete(struct device *dev) 349 { 350 struct intel_vbtn_priv *priv = dev_get_drvdata(dev); 351 352 priv->wakeup_mode = false; 353 } 354 355 static int intel_vbtn_pm_resume(struct device *dev) 356 { 357 struct intel_vbtn_priv *priv = dev_get_drvdata(dev); 358 359 intel_vbtn_pm_complete(dev); 360 361 if (priv->has_switches) 362 detect_tablet_mode(dev); 363 364 return 0; 365 } 366 367 static const struct dev_pm_ops intel_vbtn_pm_ops = { 368 .prepare = intel_vbtn_pm_prepare, 369 .complete = intel_vbtn_pm_complete, 370 .resume = intel_vbtn_pm_resume, 371 .restore = intel_vbtn_pm_resume, 372 .thaw = intel_vbtn_pm_resume, 373 }; 374 375 static struct platform_driver intel_vbtn_pl_driver = { 376 .driver = { 377 .name = "intel-vbtn", 378 .acpi_match_table = intel_vbtn_ids, 379 .pm = &intel_vbtn_pm_ops, 380 }, 381 .probe = intel_vbtn_probe, 382 .remove_new = intel_vbtn_remove, 383 }; 384 385 static acpi_status __init 386 check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv) 387 { 388 const struct acpi_device_id *ids = context; 389 struct acpi_device *dev = acpi_fetch_acpi_dev(handle); 390 391 if (dev && acpi_match_device_ids(dev, ids) == 0) 392 if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL))) 393 dev_info(&dev->dev, 394 "intel-vbtn: created platform device\n"); 395 396 return AE_OK; 397 } 398 399 static int __init intel_vbtn_init(void) 400 { 401 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 402 ACPI_UINT32_MAX, check_acpi_dev, NULL, 403 (void *)intel_vbtn_ids, NULL); 404 405 return platform_driver_register(&intel_vbtn_pl_driver); 406 } 407 module_init(intel_vbtn_init); 408 409 static void __exit intel_vbtn_exit(void) 410 { 411 platform_driver_unregister(&intel_vbtn_pl_driver); 412 } 413 module_exit(intel_vbtn_exit); 414