1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Supports for the button array on SoC tablets originally running 4 * Windows 8. 5 * 6 * (C) Copyright 2014 Intel Corporation 7 */ 8 9 #include <linux/module.h> 10 #include <linux/input.h> 11 #include <linux/init.h> 12 #include <linux/irq.h> 13 #include <linux/kernel.h> 14 #include <linux/acpi.h> 15 #include <linux/dmi.h> 16 #include <linux/gpio/consumer.h> 17 #include <linux/gpio_keys.h> 18 #include <linux/gpio.h> 19 #include <linux/platform_device.h> 20 21 static bool use_low_level_irq; 22 module_param(use_low_level_irq, bool, 0444); 23 MODULE_PARM_DESC(use_low_level_irq, "Use low-level triggered IRQ instead of edge triggered"); 24 25 struct soc_button_info { 26 const char *name; 27 int acpi_index; 28 unsigned int event_type; 29 unsigned int event_code; 30 bool autorepeat; 31 bool wakeup; 32 bool active_low; 33 }; 34 35 struct soc_device_data { 36 const struct soc_button_info *button_info; 37 int (*check)(struct device *dev); 38 }; 39 40 /* 41 * Some of the buttons like volume up/down are auto repeat, while others 42 * are not. To support both, we register two platform devices, and put 43 * buttons into them based on whether the key should be auto repeat. 44 */ 45 #define BUTTON_TYPES 2 46 47 struct soc_button_data { 48 struct platform_device *children[BUTTON_TYPES]; 49 }; 50 51 /* 52 * Some 2-in-1s which use the soc_button_array driver have this ugly issue in 53 * their DSDT where the _LID method modifies the irq-type settings of the GPIOs 54 * used for the power and home buttons. The intend of this AML code is to 55 * disable these buttons when the lid is closed. 56 * The AML does this by directly poking the GPIO controllers registers. This is 57 * problematic because when re-enabling the irq, which happens whenever _LID 58 * gets called with the lid open (e.g. on boot and on resume), it sets the 59 * irq-type to IRQ_TYPE_LEVEL_LOW. Where as the gpio-keys driver programs the 60 * type to, and expects it to be, IRQ_TYPE_EDGE_BOTH. 61 * To work around this we don't set gpio_keys_button.gpio on these 2-in-1s, 62 * instead we get the irq for the GPIO ourselves, configure it as 63 * IRQ_TYPE_LEVEL_LOW (to match how the _LID AML code configures it) and pass 64 * the irq in gpio_keys_button.irq. Below is a list of affected devices. 65 */ 66 static const struct dmi_system_id dmi_use_low_level_irq[] = { 67 { 68 /* 69 * Acer Switch 10 SW5-012. _LID method messes with home- and 70 * power-button GPIO IRQ settings. When (re-)enabling the irq 71 * it ors in its own flags without clearing the previous set 72 * ones, leading to an irq-type of IRQ_TYPE_LEVEL_LOW | 73 * IRQ_TYPE_LEVEL_HIGH causing a continuous interrupt storm. 74 */ 75 .matches = { 76 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 77 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire SW5-012"), 78 }, 79 }, 80 { 81 /* Acer Switch V 10 SW5-017, same issue as Acer Switch 10 SW5-012. */ 82 .matches = { 83 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 84 DMI_MATCH(DMI_PRODUCT_NAME, "SW5-017"), 85 }, 86 }, 87 { 88 /* 89 * Acer One S1003. _LID method messes with power-button GPIO 90 * IRQ settings, leading to a non working power-button. 91 */ 92 .matches = { 93 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 94 DMI_MATCH(DMI_PRODUCT_NAME, "One S1003"), 95 }, 96 }, 97 { 98 /* 99 * Lenovo Yoga Tab2 1051F/1051L, something messes with the home-button 100 * IRQ settings, leading to a non working home-button. 101 */ 102 .matches = { 103 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 104 DMI_MATCH(DMI_PRODUCT_NAME, "60073"), 105 DMI_MATCH(DMI_PRODUCT_VERSION, "1051"), 106 }, 107 }, 108 {} /* Terminating entry */ 109 }; 110 111 /* 112 * Some devices have a wrong entry which points to a GPIO which is 113 * required in another driver, so this driver must not claim it. 114 */ 115 static const struct dmi_system_id dmi_invalid_acpi_index[] = { 116 { 117 /* 118 * Lenovo Yoga Book X90F / X90L, the PNP0C40 home button entry 119 * points to a GPIO which is not a home button and which is 120 * required by the lenovo-yogabook driver. 121 */ 122 .matches = { 123 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), 124 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"), 125 DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"), 126 }, 127 .driver_data = (void *)1l, 128 }, 129 {} /* Terminating entry */ 130 }; 131 132 /* 133 * Get the Nth GPIO number from the ACPI object. 134 */ 135 static int soc_button_lookup_gpio(struct device *dev, int acpi_index, 136 int *gpio_ret, int *irq_ret) 137 { 138 struct gpio_desc *desc; 139 140 desc = gpiod_get_index(dev, NULL, acpi_index, GPIOD_ASIS); 141 if (IS_ERR(desc)) 142 return PTR_ERR(desc); 143 144 *gpio_ret = desc_to_gpio(desc); 145 *irq_ret = gpiod_to_irq(desc); 146 147 gpiod_put(desc); 148 149 return 0; 150 } 151 152 static struct platform_device * 153 soc_button_device_create(struct platform_device *pdev, 154 const struct soc_button_info *button_info, 155 bool autorepeat) 156 { 157 const struct soc_button_info *info; 158 struct platform_device *pd; 159 struct gpio_keys_button *gpio_keys; 160 struct gpio_keys_platform_data *gpio_keys_pdata; 161 const struct dmi_system_id *dmi_id; 162 int invalid_acpi_index = -1; 163 int error, gpio, irq; 164 int n_buttons = 0; 165 166 for (info = button_info; info->name; info++) 167 if (info->autorepeat == autorepeat) 168 n_buttons++; 169 170 gpio_keys_pdata = devm_kzalloc(&pdev->dev, 171 sizeof(*gpio_keys_pdata) + 172 sizeof(*gpio_keys) * n_buttons, 173 GFP_KERNEL); 174 if (!gpio_keys_pdata) 175 return ERR_PTR(-ENOMEM); 176 177 gpio_keys = (void *)(gpio_keys_pdata + 1); 178 n_buttons = 0; 179 180 dmi_id = dmi_first_match(dmi_invalid_acpi_index); 181 if (dmi_id) 182 invalid_acpi_index = (long)dmi_id->driver_data; 183 184 for (info = button_info; info->name; info++) { 185 if (info->autorepeat != autorepeat) 186 continue; 187 188 if (info->acpi_index == invalid_acpi_index) 189 continue; 190 191 error = soc_button_lookup_gpio(&pdev->dev, info->acpi_index, &gpio, &irq); 192 if (error || irq < 0) { 193 /* 194 * Skip GPIO if not present. Note we deliberately 195 * ignore -EPROBE_DEFER errors here. On some devices 196 * Intel is using so called virtual GPIOs which are not 197 * GPIOs at all but some way for AML code to check some 198 * random status bits without need a custom opregion. 199 * In some cases the resources table we parse points to 200 * such a virtual GPIO, since these are not real GPIOs 201 * we do not have a driver for these so they will never 202 * show up, therefore we ignore -EPROBE_DEFER. 203 */ 204 continue; 205 } 206 207 /* See dmi_use_low_level_irq[] comment */ 208 if (!autorepeat && (use_low_level_irq || 209 dmi_check_system(dmi_use_low_level_irq))) { 210 irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW); 211 gpio_keys[n_buttons].irq = irq; 212 gpio_keys[n_buttons].gpio = -ENOENT; 213 } else { 214 gpio_keys[n_buttons].gpio = gpio; 215 } 216 217 gpio_keys[n_buttons].type = info->event_type; 218 gpio_keys[n_buttons].code = info->event_code; 219 gpio_keys[n_buttons].active_low = info->active_low; 220 gpio_keys[n_buttons].desc = info->name; 221 gpio_keys[n_buttons].wakeup = info->wakeup; 222 /* These devices often use cheap buttons, use 50 ms debounce */ 223 gpio_keys[n_buttons].debounce_interval = 50; 224 n_buttons++; 225 } 226 227 if (n_buttons == 0) { 228 error = -ENODEV; 229 goto err_free_mem; 230 } 231 232 gpio_keys_pdata->buttons = gpio_keys; 233 gpio_keys_pdata->nbuttons = n_buttons; 234 gpio_keys_pdata->rep = autorepeat; 235 236 pd = platform_device_register_resndata(&pdev->dev, "gpio-keys", 237 PLATFORM_DEVID_AUTO, NULL, 0, 238 gpio_keys_pdata, 239 sizeof(*gpio_keys_pdata)); 240 error = PTR_ERR_OR_ZERO(pd); 241 if (error) { 242 dev_err(&pdev->dev, 243 "failed registering gpio-keys: %d\n", error); 244 goto err_free_mem; 245 } 246 247 return pd; 248 249 err_free_mem: 250 devm_kfree(&pdev->dev, gpio_keys_pdata); 251 return ERR_PTR(error); 252 } 253 254 static int soc_button_get_acpi_object_int(const union acpi_object *obj) 255 { 256 if (obj->type != ACPI_TYPE_INTEGER) 257 return -1; 258 259 return obj->integer.value; 260 } 261 262 /* Parse a single ACPI0011 _DSD button descriptor */ 263 static int soc_button_parse_btn_desc(struct device *dev, 264 const union acpi_object *desc, 265 int collection_uid, 266 struct soc_button_info *info) 267 { 268 int upage, usage; 269 270 if (desc->type != ACPI_TYPE_PACKAGE || 271 desc->package.count != 5 || 272 /* First byte should be 1 (control) */ 273 soc_button_get_acpi_object_int(&desc->package.elements[0]) != 1 || 274 /* Third byte should be collection uid */ 275 soc_button_get_acpi_object_int(&desc->package.elements[2]) != 276 collection_uid) { 277 dev_err(dev, "Invalid ACPI Button Descriptor\n"); 278 return -ENODEV; 279 } 280 281 info->event_type = EV_KEY; 282 info->active_low = true; 283 info->acpi_index = 284 soc_button_get_acpi_object_int(&desc->package.elements[1]); 285 upage = soc_button_get_acpi_object_int(&desc->package.elements[3]); 286 usage = soc_button_get_acpi_object_int(&desc->package.elements[4]); 287 288 /* 289 * The UUID: fa6bd625-9ce8-470d-a2c7-b3ca36c4282e descriptors use HID 290 * usage page and usage codes, but otherwise the device is not HID 291 * compliant: it uses one irq per button instead of generating HID 292 * input reports and some buttons should generate wakeups where as 293 * others should not, so we cannot use the HID subsystem. 294 * 295 * Luckily all devices only use a few usage page + usage combinations, 296 * so we can simply check for the known combinations here. 297 */ 298 if (upage == 0x01 && usage == 0x81) { 299 info->name = "power"; 300 info->event_code = KEY_POWER; 301 info->wakeup = true; 302 } else if (upage == 0x01 && usage == 0xca) { 303 info->name = "rotation lock switch"; 304 info->event_type = EV_SW; 305 info->event_code = SW_ROTATE_LOCK; 306 } else if (upage == 0x07 && usage == 0xe3) { 307 info->name = "home"; 308 info->event_code = KEY_LEFTMETA; 309 info->wakeup = true; 310 } else if (upage == 0x0c && usage == 0xe9) { 311 info->name = "volume_up"; 312 info->event_code = KEY_VOLUMEUP; 313 info->autorepeat = true; 314 } else if (upage == 0x0c && usage == 0xea) { 315 info->name = "volume_down"; 316 info->event_code = KEY_VOLUMEDOWN; 317 info->autorepeat = true; 318 } else { 319 dev_warn(dev, "Unknown button index %d upage %02x usage %02x, ignoring\n", 320 info->acpi_index, upage, usage); 321 info->name = "unknown"; 322 info->event_code = KEY_RESERVED; 323 } 324 325 return 0; 326 } 327 328 /* ACPI0011 _DSD btns descriptors UUID: fa6bd625-9ce8-470d-a2c7-b3ca36c4282e */ 329 static const u8 btns_desc_uuid[16] = { 330 0x25, 0xd6, 0x6b, 0xfa, 0xe8, 0x9c, 0x0d, 0x47, 331 0xa2, 0xc7, 0xb3, 0xca, 0x36, 0xc4, 0x28, 0x2e 332 }; 333 334 /* Parse ACPI0011 _DSD button descriptors */ 335 static struct soc_button_info *soc_button_get_button_info(struct device *dev) 336 { 337 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; 338 const union acpi_object *desc, *el0, *uuid, *btns_desc = NULL; 339 struct soc_button_info *button_info; 340 acpi_status status; 341 int i, btn, collection_uid = -1; 342 343 status = acpi_evaluate_object_typed(ACPI_HANDLE(dev), "_DSD", NULL, 344 &buf, ACPI_TYPE_PACKAGE); 345 if (ACPI_FAILURE(status)) { 346 dev_err(dev, "ACPI _DSD object not found\n"); 347 return ERR_PTR(-ENODEV); 348 } 349 350 /* Look for the Button Descriptors UUID */ 351 desc = buf.pointer; 352 for (i = 0; (i + 1) < desc->package.count; i += 2) { 353 uuid = &desc->package.elements[i]; 354 355 if (uuid->type != ACPI_TYPE_BUFFER || 356 uuid->buffer.length != 16 || 357 desc->package.elements[i + 1].type != ACPI_TYPE_PACKAGE) { 358 break; 359 } 360 361 if (memcmp(uuid->buffer.pointer, btns_desc_uuid, 16) == 0) { 362 btns_desc = &desc->package.elements[i + 1]; 363 break; 364 } 365 } 366 367 if (!btns_desc) { 368 dev_err(dev, "ACPI Button Descriptors not found\n"); 369 button_info = ERR_PTR(-ENODEV); 370 goto out; 371 } 372 373 /* The first package describes the collection */ 374 el0 = &btns_desc->package.elements[0]; 375 if (el0->type == ACPI_TYPE_PACKAGE && 376 el0->package.count == 5 && 377 /* First byte should be 0 (collection) */ 378 soc_button_get_acpi_object_int(&el0->package.elements[0]) == 0 && 379 /* Third byte should be 0 (top level collection) */ 380 soc_button_get_acpi_object_int(&el0->package.elements[2]) == 0) { 381 collection_uid = soc_button_get_acpi_object_int( 382 &el0->package.elements[1]); 383 } 384 if (collection_uid == -1) { 385 dev_err(dev, "Invalid Button Collection Descriptor\n"); 386 button_info = ERR_PTR(-ENODEV); 387 goto out; 388 } 389 390 /* There are package.count - 1 buttons + 1 terminating empty entry */ 391 button_info = devm_kcalloc(dev, btns_desc->package.count, 392 sizeof(*button_info), GFP_KERNEL); 393 if (!button_info) { 394 button_info = ERR_PTR(-ENOMEM); 395 goto out; 396 } 397 398 /* Parse the button descriptors */ 399 for (i = 1, btn = 0; i < btns_desc->package.count; i++, btn++) { 400 if (soc_button_parse_btn_desc(dev, 401 &btns_desc->package.elements[i], 402 collection_uid, 403 &button_info[btn])) { 404 button_info = ERR_PTR(-ENODEV); 405 goto out; 406 } 407 } 408 409 out: 410 kfree(buf.pointer); 411 return button_info; 412 } 413 414 static int soc_button_remove(struct platform_device *pdev) 415 { 416 struct soc_button_data *priv = platform_get_drvdata(pdev); 417 418 int i; 419 420 for (i = 0; i < BUTTON_TYPES; i++) 421 if (priv->children[i]) 422 platform_device_unregister(priv->children[i]); 423 424 return 0; 425 } 426 427 static int soc_button_probe(struct platform_device *pdev) 428 { 429 struct device *dev = &pdev->dev; 430 const struct soc_device_data *device_data; 431 const struct soc_button_info *button_info; 432 struct soc_button_data *priv; 433 struct platform_device *pd; 434 int i; 435 int error; 436 437 device_data = acpi_device_get_match_data(dev); 438 if (device_data && device_data->check) { 439 error = device_data->check(dev); 440 if (error) 441 return error; 442 } 443 444 if (device_data && device_data->button_info) { 445 button_info = device_data->button_info; 446 } else { 447 button_info = soc_button_get_button_info(dev); 448 if (IS_ERR(button_info)) 449 return PTR_ERR(button_info); 450 } 451 452 error = gpiod_count(dev, NULL); 453 if (error < 0) { 454 dev_dbg(dev, "no GPIO attached, ignoring...\n"); 455 return -ENODEV; 456 } 457 458 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 459 if (!priv) 460 return -ENOMEM; 461 462 platform_set_drvdata(pdev, priv); 463 464 for (i = 0; i < BUTTON_TYPES; i++) { 465 pd = soc_button_device_create(pdev, button_info, i == 0); 466 if (IS_ERR(pd)) { 467 error = PTR_ERR(pd); 468 if (error != -ENODEV) { 469 soc_button_remove(pdev); 470 return error; 471 } 472 continue; 473 } 474 475 priv->children[i] = pd; 476 } 477 478 if (!priv->children[0] && !priv->children[1]) 479 return -ENODEV; 480 481 if (!device_data || !device_data->button_info) 482 devm_kfree(dev, button_info); 483 484 return 0; 485 } 486 487 /* 488 * Definition of buttons on the tablet. The ACPI index of each button 489 * is defined in section 2.8.7.2 of "Windows ACPI Design Guide for SoC 490 * Platforms" 491 */ 492 static const struct soc_button_info soc_button_PNP0C40[] = { 493 { "power", 0, EV_KEY, KEY_POWER, false, true, true }, 494 { "home", 1, EV_KEY, KEY_LEFTMETA, false, true, true }, 495 { "volume_up", 2, EV_KEY, KEY_VOLUMEUP, true, false, true }, 496 { "volume_down", 3, EV_KEY, KEY_VOLUMEDOWN, true, false, true }, 497 { "rotation_lock", 4, EV_KEY, KEY_ROTATE_LOCK_TOGGLE, false, false, true }, 498 { } 499 }; 500 501 static const struct soc_device_data soc_device_PNP0C40 = { 502 .button_info = soc_button_PNP0C40, 503 }; 504 505 static const struct soc_button_info soc_button_INT33D3[] = { 506 { "tablet_mode", 0, EV_SW, SW_TABLET_MODE, false, false, false }, 507 { } 508 }; 509 510 static const struct soc_device_data soc_device_INT33D3 = { 511 .button_info = soc_button_INT33D3, 512 }; 513 514 /* 515 * Button info for Microsoft Surface 3 (non pro), this is indentical to 516 * the PNP0C40 info except that the home button is active-high. 517 * 518 * The Surface 3 Pro also has a MSHW0028 ACPI device, but that uses a custom 519 * version of the drivers/platform/x86/intel/hid.c 5 button array ACPI API 520 * instead. A check() callback is not necessary though as the Surface 3 Pro 521 * MSHW0028 ACPI device's resource table does not contain any GPIOs. 522 */ 523 static const struct soc_button_info soc_button_MSHW0028[] = { 524 { "power", 0, EV_KEY, KEY_POWER, false, true, true }, 525 { "home", 1, EV_KEY, KEY_LEFTMETA, false, true, false }, 526 { "volume_up", 2, EV_KEY, KEY_VOLUMEUP, true, false, true }, 527 { "volume_down", 3, EV_KEY, KEY_VOLUMEDOWN, true, false, true }, 528 { } 529 }; 530 531 static const struct soc_device_data soc_device_MSHW0028 = { 532 .button_info = soc_button_MSHW0028, 533 }; 534 535 /* 536 * Special device check for Surface Book 2 and Surface Pro (2017). 537 * Both, the Surface Pro 4 (surfacepro3_button.c) and the above mentioned 538 * devices use MSHW0040 for power and volume buttons, however the way they 539 * have to be addressed differs. Make sure that we only load this drivers 540 * for the correct devices by checking the OEM Platform Revision provided by 541 * the _DSM method. 542 */ 543 #define MSHW0040_DSM_REVISION 0x01 544 #define MSHW0040_DSM_GET_OMPR 0x02 // get OEM Platform Revision 545 static const guid_t MSHW0040_DSM_UUID = 546 GUID_INIT(0x6fd05c69, 0xcde3, 0x49f4, 0x95, 0xed, 0xab, 0x16, 0x65, 547 0x49, 0x80, 0x35); 548 549 static int soc_device_check_MSHW0040(struct device *dev) 550 { 551 acpi_handle handle = ACPI_HANDLE(dev); 552 union acpi_object *result; 553 u64 oem_platform_rev = 0; // valid revisions are nonzero 554 555 // get OEM platform revision 556 result = acpi_evaluate_dsm_typed(handle, &MSHW0040_DSM_UUID, 557 MSHW0040_DSM_REVISION, 558 MSHW0040_DSM_GET_OMPR, NULL, 559 ACPI_TYPE_INTEGER); 560 561 if (result) { 562 oem_platform_rev = result->integer.value; 563 ACPI_FREE(result); 564 } 565 566 /* 567 * If the revision is zero here, the _DSM evaluation has failed. This 568 * indicates that we have a Pro 4 or Book 1 and this driver should not 569 * be used. 570 */ 571 if (oem_platform_rev == 0) 572 return -ENODEV; 573 574 dev_dbg(dev, "OEM Platform Revision %llu\n", oem_platform_rev); 575 576 return 0; 577 } 578 579 /* 580 * Button infos for Microsoft Surface Book 2 and Surface Pro (2017). 581 * Obtained from DSDT/testing. 582 */ 583 static const struct soc_button_info soc_button_MSHW0040[] = { 584 { "power", 0, EV_KEY, KEY_POWER, false, true, true }, 585 { "volume_up", 2, EV_KEY, KEY_VOLUMEUP, true, false, true }, 586 { "volume_down", 4, EV_KEY, KEY_VOLUMEDOWN, true, false, true }, 587 { } 588 }; 589 590 static const struct soc_device_data soc_device_MSHW0040 = { 591 .button_info = soc_button_MSHW0040, 592 .check = soc_device_check_MSHW0040, 593 }; 594 595 static const struct acpi_device_id soc_button_acpi_match[] = { 596 { "PNP0C40", (unsigned long)&soc_device_PNP0C40 }, 597 { "INT33D3", (unsigned long)&soc_device_INT33D3 }, 598 { "ID9001", (unsigned long)&soc_device_INT33D3 }, 599 { "ACPI0011", 0 }, 600 601 /* Microsoft Surface Devices (3th, 5th and 6th generation) */ 602 { "MSHW0028", (unsigned long)&soc_device_MSHW0028 }, 603 { "MSHW0040", (unsigned long)&soc_device_MSHW0040 }, 604 605 { } 606 }; 607 608 MODULE_DEVICE_TABLE(acpi, soc_button_acpi_match); 609 610 static struct platform_driver soc_button_driver = { 611 .probe = soc_button_probe, 612 .remove = soc_button_remove, 613 .driver = { 614 .name = KBUILD_MODNAME, 615 .acpi_match_table = ACPI_PTR(soc_button_acpi_match), 616 }, 617 }; 618 module_platform_driver(soc_button_driver); 619 620 MODULE_LICENSE("GPL"); 621