drivers/platform/chrome/chromeos_laptop.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 // Driver to instantiate Chromebook i2c/smbus devices.
   3 //
   4 // Copyright (C) 2012 Google, Inc.
   5 // Author: Benson Leung <bleung@chromium.org>
   6
   7 #define pr_fmt(fmt)             KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/acpi.h>
  10 #include <linux/dmi.h>
  11 #include <linux/i2c.h>
  12 #include <linux/input.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/ioport.h>
  15 #include <linux/module.h>
  16 #include <linux/pci.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/property.h>
  19
  20 #define ATMEL_TP_I2C_ADDR       0x4b
  21 #define ATMEL_TP_I2C_BL_ADDR    0x25
  22 #define ATMEL_TS_I2C_ADDR       0x4a
  23 #define ATMEL_TS_I2C_BL_ADDR    0x26
  24 #define CYAPA_TP_I2C_ADDR       0x67
  25 #define ELAN_TP_I2C_ADDR        0x15
  26 #define ISL_ALS_I2C_ADDR        0x44
  27 #define TAOS_ALS_I2C_ADDR       0x29
  28
  29 static const char *i2c_adapter_names[] = {
  30         "SMBus I801 adapter",
  31         "i915 gmbus vga",
  32         "i915 gmbus panel",
  33         "Synopsys DesignWare I2C adapter",
  34 };
  35
  36 /* Keep this enum consistent with i2c_adapter_names */
  37 enum i2c_adapter_type {
  38         I2C_ADAPTER_SMBUS = 0,
  39         I2C_ADAPTER_VGADDC,
  40         I2C_ADAPTER_PANEL,
  41         I2C_ADAPTER_DESIGNWARE,
  42 };
  43
  44 struct i2c_peripheral {
  45         struct i2c_board_info board_info;
  46         unsigned short alt_addr;
  47
  48         const char *dmi_name;
  49         unsigned long irqflags;
  50         struct resource irq_resource;
  51
  52         enum i2c_adapter_type type;
  53         u32 pci_devid;
  54
  55         const struct property_entry *properties;
  56
  57         struct i2c_client *client;
  58 };
  59
  60 struct acpi_peripheral {
  61         char hid[ACPI_ID_LEN];
  62         struct software_node swnode;
  63         struct i2c_client *client;
  64 };
  65
  66 struct chromeos_laptop {
  67         /*
  68          * Note that we can't mark this pointer as const because
  69          * i2c_new_scanned_device() changes passed in I2C board info, so.
  70          */
  71         struct i2c_peripheral *i2c_peripherals;
  72         unsigned int num_i2c_peripherals;
  73
  74         struct acpi_peripheral *acpi_peripherals;
  75         unsigned int num_acpi_peripherals;
  76 };
  77
  78 static const struct chromeos_laptop *cros_laptop;
  79
  80 static struct i2c_client *
  81 chromes_laptop_instantiate_i2c_device(struct i2c_adapter *adapter,
  82                                       struct i2c_board_info *info,
  83                                       unsigned short alt_addr)
  84 {
  85         const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
  86         struct i2c_client *client;
  87
  88         /*
  89          * Add the i2c device. If we can't detect it at the primary
  90          * address we scan secondary addresses. In any case the client
  91          * structure gets assigned primary address.
  92          */
  93         client = i2c_new_scanned_device(adapter, info, addr_list, NULL);
  94         if (IS_ERR(client) && alt_addr) {
  95                 struct i2c_board_info dummy_info = {
  96                         I2C_BOARD_INFO("dummy", info->addr),
  97                 };
  98                 const unsigned short alt_addr_list[] = {
  99                         alt_addr, I2C_CLIENT_END
 100                 };
 101                 struct i2c_client *dummy;
 102
 103                 dummy = i2c_new_scanned_device(adapter, &dummy_info,
 104                                                alt_addr_list, NULL);
 105                 if (!IS_ERR(dummy)) {
 106                         pr_debug("%d-%02x is probed at %02x\n",
 107                                  adapter->nr, info->addr, dummy->addr);
 108                         i2c_unregister_device(dummy);
 109                         client = i2c_new_client_device(adapter, info);
 110                 }
 111         }
 112
 113         if (IS_ERR(client)) {
 114                 client = NULL;
 115                 pr_debug("failed to register device %d-%02x\n",
 116                          adapter->nr, info->addr);
 117         } else {
 118                 pr_debug("added i2c device %d-%02x\n",
 119                          adapter->nr, info->addr);
 120         }
 121
 122         return client;
 123 }
 124
 125 static bool chromeos_laptop_match_adapter_devid(struct device *dev, u32 devid)
 126 {
 127         struct pci_dev *pdev;
 128
 129         if (!dev_is_pci(dev))
 130                 return false;
 131
 132         pdev = to_pci_dev(dev);
 133         return devid == pci_dev_id(pdev);
 134 }
 135
 136 static void chromeos_laptop_check_adapter(struct i2c_adapter *adapter)
 137 {
 138         struct i2c_peripheral *i2c_dev;
 139         int i;
 140
 141         for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
 142                 i2c_dev = &cros_laptop->i2c_peripherals[i];
 143
 144                 /* Skip devices already created */
 145                 if (i2c_dev->client)
 146                         continue;
 147
 148                 if (strncmp(adapter->name, i2c_adapter_names[i2c_dev->type],
 149                             strlen(i2c_adapter_names[i2c_dev->type])))
 150                         continue;
 151
 152                 if (i2c_dev->pci_devid &&
 153                     !chromeos_laptop_match_adapter_devid(adapter->dev.parent,
 154                                                          i2c_dev->pci_devid)) {
 155                         continue;
 156                 }
 157
 158                 i2c_dev->client =
 159                         chromes_laptop_instantiate_i2c_device(adapter,
 160                                                         &i2c_dev->board_info,
 161                                                         i2c_dev->alt_addr);
 162         }
 163 }
 164
 165 static bool chromeos_laptop_adjust_client(struct i2c_client *client)
 166 {
 167         struct acpi_peripheral *acpi_dev;
 168         struct acpi_device_id acpi_ids[2] = { };
 169         int i;
 170         int error;
 171
 172         if (!has_acpi_companion(&client->dev))
 173                 return false;
 174
 175         for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
 176                 acpi_dev = &cros_laptop->acpi_peripherals[i];
 177
 178                 memcpy(acpi_ids[0].id, acpi_dev->hid, ACPI_ID_LEN);
 179
 180                 if (acpi_match_device(acpi_ids, &client->dev)) {
 181                         error = device_add_software_node(&client->dev, &acpi_dev->swnode);
 182                         if (error) {
 183                                 dev_err(&client->dev,
 184                                         "failed to add properties: %d\n",
 185                                         error);
 186                                 break;
 187                         }
 188
 189                         acpi_dev->client = client;
 190
 191                         return true;
 192                 }
 193         }
 194
 195         return false;
 196 }
 197
 198 static void chromeos_laptop_detach_i2c_client(struct i2c_client *client)
 199 {
 200         struct acpi_peripheral *acpi_dev;
 201         struct i2c_peripheral *i2c_dev;
 202         int i;
 203
 204         if (has_acpi_companion(&client->dev))
 205                 for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
 206                         acpi_dev = &cros_laptop->acpi_peripherals[i];
 207
 208                         if (acpi_dev->client == client) {
 209                                 acpi_dev->client = NULL;
 210                                 return;
 211                         }
 212                 }
 213         else
 214                 for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
 215                         i2c_dev = &cros_laptop->i2c_peripherals[i];
 216
 217                         if (i2c_dev->client == client) {
 218                                 i2c_dev->client = NULL;
 219                                 return;
 220                         }
 221                 }
 222 }
 223
 224 static int chromeos_laptop_i2c_notifier_call(struct notifier_block *nb,
 225                                              unsigned long action, void *data)
 226 {
 227         struct device *dev = data;
 228
 229         switch (action) {
 230         case BUS_NOTIFY_ADD_DEVICE:
 231                 if (dev->type == &i2c_adapter_type)
 232                         chromeos_laptop_check_adapter(to_i2c_adapter(dev));
 233                 else if (dev->type == &i2c_client_type)
 234                         chromeos_laptop_adjust_client(to_i2c_client(dev));
 235                 break;
 236
 237         case BUS_NOTIFY_REMOVED_DEVICE:
 238                 if (dev->type == &i2c_client_type)
 239                         chromeos_laptop_detach_i2c_client(to_i2c_client(dev));
 240                 break;
 241         }
 242
 243         return 0;
 244 }
 245
 246 static struct notifier_block chromeos_laptop_i2c_notifier = {
 247         .notifier_call = chromeos_laptop_i2c_notifier_call,
 248 };
 249
 250 #define DECLARE_CROS_LAPTOP(_name)                                      \
 251 static const struct chromeos_laptop _name __initconst = {               \
 252         .i2c_peripherals        = _name##_peripherals,                  \
 253         .num_i2c_peripherals    = ARRAY_SIZE(_name##_peripherals),      \
 254 }
 255
 256 #define DECLARE_ACPI_CROS_LAPTOP(_name)                                 \
 257 static const struct chromeos_laptop _name __initconst = {               \
 258         .acpi_peripherals       = _name##_peripherals,                  \
 259         .num_acpi_peripherals   = ARRAY_SIZE(_name##_peripherals),      \
 260 }
 261
 262 static struct i2c_peripheral samsung_series_5_550_peripherals[] __initdata = {
 263         /* Touchpad. */
 264         {
 265                 .board_info     = {
 266                         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 267                         .flags          = I2C_CLIENT_WAKE,
 268                 },
 269                 .dmi_name       = "trackpad",
 270                 .type           = I2C_ADAPTER_SMBUS,
 271         },
 272         /* Light Sensor. */
 273         {
 274                 .board_info     = {
 275                         I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
 276                 },
 277                 .dmi_name       = "lightsensor",
 278                 .type           = I2C_ADAPTER_SMBUS,
 279         },
 280 };
 281 DECLARE_CROS_LAPTOP(samsung_series_5_550);
 282
 283 static struct i2c_peripheral samsung_series_5_peripherals[] __initdata = {
 284         /* Light Sensor. */
 285         {
 286                 .board_info     = {
 287                         I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
 288                 },
 289                 .type           = I2C_ADAPTER_SMBUS,
 290         },
 291 };
 292 DECLARE_CROS_LAPTOP(samsung_series_5);
 293
 294 static const int chromebook_pixel_tp_keys[] __initconst = {
 295         KEY_RESERVED,
 296         KEY_RESERVED,
 297         KEY_RESERVED,
 298         KEY_RESERVED,
 299         KEY_RESERVED,
 300         BTN_LEFT
 301 };
 302
 303 static const struct property_entry
 304 chromebook_pixel_trackpad_props[] __initconst = {
 305         PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
 306         PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", chromebook_pixel_tp_keys),
 307         { }
 308 };
 309
 310 static const struct property_entry
 311 chromebook_atmel_touchscreen_props[] __initconst = {
 312         PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
 313         { }
 314 };
 315
 316 static struct i2c_peripheral chromebook_pixel_peripherals[] __initdata = {
 317         /* Touch Screen. */
 318         {
 319                 .board_info     = {
 320                         I2C_BOARD_INFO("atmel_mxt_ts",
 321                                         ATMEL_TS_I2C_ADDR),
 322                         .flags          = I2C_CLIENT_WAKE,
 323                 },
 324                 .dmi_name       = "touchscreen",
 325                 .irqflags       = IRQF_TRIGGER_FALLING,
 326                 .type           = I2C_ADAPTER_PANEL,
 327                 .alt_addr       = ATMEL_TS_I2C_BL_ADDR,
 328                 .properties     = chromebook_atmel_touchscreen_props,
 329         },
 330         /* Touchpad. */
 331         {
 332                 .board_info     = {
 333                         I2C_BOARD_INFO("atmel_mxt_tp",
 334                                         ATMEL_TP_I2C_ADDR),
 335                         .flags          = I2C_CLIENT_WAKE,
 336                 },
 337                 .dmi_name       = "trackpad",
 338                 .irqflags       = IRQF_TRIGGER_FALLING,
 339                 .type           = I2C_ADAPTER_VGADDC,
 340                 .alt_addr       = ATMEL_TP_I2C_BL_ADDR,
 341                 .properties     = chromebook_pixel_trackpad_props,
 342         },
 343         /* Light Sensor. */
 344         {
 345                 .board_info     = {
 346                         I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
 347                 },
 348                 .dmi_name       = "lightsensor",
 349                 .type           = I2C_ADAPTER_PANEL,
 350         },
 351 };
 352 DECLARE_CROS_LAPTOP(chromebook_pixel);
 353
 354 static struct i2c_peripheral hp_chromebook_14_peripherals[] __initdata = {
 355         /* Touchpad. */
 356         {
 357                 .board_info     = {
 358                         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 359                         .flags          = I2C_CLIENT_WAKE,
 360                 },
 361                 .dmi_name       = "trackpad",
 362                 .type           = I2C_ADAPTER_DESIGNWARE,
 363         },
 364 };
 365 DECLARE_CROS_LAPTOP(hp_chromebook_14);
 366
 367 static struct i2c_peripheral dell_chromebook_11_peripherals[] __initdata = {
 368         /* Touchpad. */
 369         {
 370                 .board_info     = {
 371                         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 372                         .flags          = I2C_CLIENT_WAKE,
 373                 },
 374                 .dmi_name       = "trackpad",
 375                 .type           = I2C_ADAPTER_DESIGNWARE,
 376         },
 377         /* Elan Touchpad option. */
 378         {
 379                 .board_info     = {
 380                         I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
 381                         .flags          = I2C_CLIENT_WAKE,
 382                 },
 383                 .dmi_name       = "trackpad",
 384                 .type           = I2C_ADAPTER_DESIGNWARE,
 385         },
 386 };
 387 DECLARE_CROS_LAPTOP(dell_chromebook_11);
 388
 389 static struct i2c_peripheral toshiba_cb35_peripherals[] __initdata = {
 390         /* Touchpad. */
 391         {
 392                 .board_info     = {
 393                         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 394                         .flags          = I2C_CLIENT_WAKE,
 395                 },
 396                 .dmi_name       = "trackpad",
 397                 .type           = I2C_ADAPTER_DESIGNWARE,
 398         },
 399 };
 400 DECLARE_CROS_LAPTOP(toshiba_cb35);
 401
 402 static struct i2c_peripheral acer_c7_chromebook_peripherals[] __initdata = {
 403         /* Touchpad. */
 404         {
 405                 .board_info     = {
 406                         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 407                         .flags          = I2C_CLIENT_WAKE,
 408                 },
 409                 .dmi_name       = "trackpad",
 410                 .type           = I2C_ADAPTER_SMBUS,
 411         },
 412 };
 413 DECLARE_CROS_LAPTOP(acer_c7_chromebook);
 414
 415 static struct i2c_peripheral acer_ac700_peripherals[] __initdata = {
 416         /* Light Sensor. */
 417         {
 418                 .board_info     = {
 419                         I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
 420                 },
 421                 .type           = I2C_ADAPTER_SMBUS,
 422         },
 423 };
 424 DECLARE_CROS_LAPTOP(acer_ac700);
 425
 426 static struct i2c_peripheral acer_c720_peripherals[] __initdata = {
 427         /* Touchscreen. */
 428         {
 429                 .board_info     = {
 430                         I2C_BOARD_INFO("atmel_mxt_ts",
 431                                         ATMEL_TS_I2C_ADDR),
 432                         .flags          = I2C_CLIENT_WAKE,
 433                 },
 434                 .dmi_name       = "touchscreen",
 435                 .irqflags       = IRQF_TRIGGER_FALLING,
 436                 .type           = I2C_ADAPTER_DESIGNWARE,
 437                 .pci_devid      = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
 438                 .alt_addr       = ATMEL_TS_I2C_BL_ADDR,
 439                 .properties     = chromebook_atmel_touchscreen_props,
 440         },
 441         /* Touchpad. */
 442         {
 443                 .board_info     = {
 444                         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 445                         .flags          = I2C_CLIENT_WAKE,
 446                 },
 447                 .dmi_name       = "trackpad",
 448                 .type           = I2C_ADAPTER_DESIGNWARE,
 449                 .pci_devid      = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
 450         },
 451         /* Elan Touchpad option. */
 452         {
 453                 .board_info     = {
 454                         I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR),
 455                         .flags          = I2C_CLIENT_WAKE,
 456                 },
 457                 .dmi_name       = "trackpad",
 458                 .type           = I2C_ADAPTER_DESIGNWARE,
 459                 .pci_devid      = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)),
 460         },
 461         /* Light Sensor. */
 462         {
 463                 .board_info     = {
 464                         I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
 465                 },
 466                 .dmi_name       = "lightsensor",
 467                 .type           = I2C_ADAPTER_DESIGNWARE,
 468                 .pci_devid      = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)),
 469         },
 470 };
 471 DECLARE_CROS_LAPTOP(acer_c720);
 472
 473 static struct i2c_peripheral
 474 hp_pavilion_14_chromebook_peripherals[] __initdata = {
 475         /* Touchpad. */
 476         {
 477                 .board_info     = {
 478                         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
 479                         .flags          = I2C_CLIENT_WAKE,
 480                 },
 481                 .dmi_name       = "trackpad",
 482                 .type           = I2C_ADAPTER_SMBUS,
 483         },
 484 };
 485 DECLARE_CROS_LAPTOP(hp_pavilion_14_chromebook);
 486
 487 static struct i2c_peripheral cr48_peripherals[] __initdata = {
 488         /* Light Sensor. */
 489         {
 490                 .board_info     = {
 491                         I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
 492                 },
 493                 .type           = I2C_ADAPTER_SMBUS,
 494         },
 495 };
 496 DECLARE_CROS_LAPTOP(cr48);
 497
 498 static const u32 samus_touchpad_buttons[] __initconst = {
 499         KEY_RESERVED,
 500         KEY_RESERVED,
 501         KEY_RESERVED,
 502         BTN_LEFT
 503 };
 504
 505 static const struct property_entry samus_trackpad_props[] __initconst = {
 506         PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"),
 507         PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", samus_touchpad_buttons),
 508         { }
 509 };
 510
 511 static struct acpi_peripheral samus_peripherals[] __initdata = {
 512         /* Touchpad */
 513         {
 514                 .hid            = "ATML0000",
 515                 .swnode         = {
 516                         .properties = samus_trackpad_props,
 517                 },
 518         },
 519         /* Touchsceen */
 520         {
 521                 .hid            = "ATML0001",
 522                 .swnode         = {
 523                         .properties = chromebook_atmel_touchscreen_props,
 524                 },
 525         },
 526 };
 527 DECLARE_ACPI_CROS_LAPTOP(samus);
 528
 529 static struct acpi_peripheral generic_atmel_peripherals[] __initdata = {
 530         /* Touchpad */
 531         {
 532                 .hid            = "ATML0000",
 533                 .swnode         = {
 534                         .properties = chromebook_pixel_trackpad_props,
 535                 },
 536         },
 537         /* Touchsceen */
 538         {
 539                 .hid            = "ATML0001",
 540                 .swnode         = {
 541                         .properties = chromebook_atmel_touchscreen_props,
 542                 },
 543         },
 544 };
 545 DECLARE_ACPI_CROS_LAPTOP(generic_atmel);
 546
 547 static const struct dmi_system_id chromeos_laptop_dmi_table[] __initconst = {
 548         {
 549                 .ident = "Samsung Series 5 550",
 550                 .matches = {
 551                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
 552                         DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
 553                 },
 554                 .driver_data = (void *)&samsung_series_5_550,
 555         },
 556         {
 557                 .ident = "Samsung Series 5",
 558                 .matches = {
 559                         DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
 560                 },
 561                 .driver_data = (void *)&samsung_series_5,
 562         },
 563         {
 564                 .ident = "Chromebook Pixel",
 565                 .matches = {
 566                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 567                         DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
 568                 },
 569                 .driver_data = (void *)&chromebook_pixel,
 570         },
 571         {
 572                 .ident = "Wolf",
 573                 .matches = {
 574                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 575                         DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
 576                 },
 577                 .driver_data = (void *)&dell_chromebook_11,
 578         },
 579         {
 580                 .ident = "HP Chromebook 14",
 581                 .matches = {
 582                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 583                         DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
 584                 },
 585                 .driver_data = (void *)&hp_chromebook_14,
 586         },
 587         {
 588                 .ident = "Toshiba CB35",
 589                 .matches = {
 590                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 591                         DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
 592                 },
 593                 .driver_data = (void *)&toshiba_cb35,
 594         },
 595         {
 596                 .ident = "Acer C7 Chromebook",
 597                 .matches = {
 598                         DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
 599                 },
 600                 .driver_data = (void *)&acer_c7_chromebook,
 601         },
 602         {
 603                 .ident = "Acer AC700",
 604                 .matches = {
 605                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 606                 },
 607                 .driver_data = (void *)&acer_ac700,
 608         },
 609         {
 610                 .ident = "Acer C720",
 611                 .matches = {
 612                         DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
 613                 },
 614                 .driver_data = (void *)&acer_c720,
 615         },
 616         {
 617                 .ident = "HP Pavilion 14 Chromebook",
 618                 .matches = {
 619                         DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
 620                 },
 621                 .driver_data = (void *)&hp_pavilion_14_chromebook,
 622         },
 623         {
 624                 .ident = "Cr-48",
 625                 .matches = {
 626                         DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
 627                 },
 628                 .driver_data = (void *)&cr48,
 629         },
 630         /* Devices with peripherals incompletely described in ACPI */
 631         {
 632                 .ident = "Chromebook Pro",
 633                 .matches = {
 634                         DMI_MATCH(DMI_SYS_VENDOR, "Google"),
 635                         DMI_MATCH(DMI_PRODUCT_NAME, "Caroline"),
 636                 },
 637                 .driver_data = (void *)&samus,
 638         },
 639         {
 640                 .ident = "Google Pixel 2 (2015)",
 641                 .matches = {
 642                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 643                         DMI_MATCH(DMI_PRODUCT_NAME, "Samus"),
 644                 },
 645                 .driver_data = (void *)&samus,
 646         },
 647         {
 648                 .ident = "Samsung Chromebook 3",
 649                 .matches = {
 650                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 651                         DMI_MATCH(DMI_PRODUCT_NAME, "Celes"),
 652                 },
 653                 .driver_data = (void *)&samus,
 654         },
 655         {
 656                 /*
 657                  * Other Chromebooks with Atmel touch controllers:
 658                  * - Winky (touchpad)
 659                  * - Clapper, Expresso, Rambi, Glimmer (touchscreen)
 660                  */
 661                 .ident = "Other Chromebook",
 662                 .matches = {
 663                         /*
 664                          * This will match all Google devices, not only devices
 665                          * with Atmel, but we will validate that the device
 666                          * actually has matching peripherals.
 667                          */
 668                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 669                 },
 670                 .driver_data = (void *)&generic_atmel,
 671         },
 672         { }
 673 };
 674 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
 675
 676 static int __init chromeos_laptop_scan_peripherals(struct device *dev, void *data)
 677 {
 678         int error;
 679
 680         if (dev->type == &i2c_adapter_type) {
 681                 chromeos_laptop_check_adapter(to_i2c_adapter(dev));
 682         } else if (dev->type == &i2c_client_type) {
 683                 if (chromeos_laptop_adjust_client(to_i2c_client(dev))) {
 684                         /*
 685                          * Now that we have needed properties re-trigger
 686                          * driver probe in case driver was initialized
 687                          * earlier and probe failed.
 688                          */
 689                         error = device_attach(dev);
 690                         if (error < 0)
 691                                 dev_warn(dev,
 692                                          "%s: device_attach() failed: %d\n",
 693                                          __func__, error);
 694                 }
 695         }
 696
 697         return 0;
 698 }
 699
 700 static int __init chromeos_laptop_get_irq_from_dmi(const char *dmi_name)
 701 {
 702         const struct dmi_device *dmi_dev;
 703         const struct dmi_dev_onboard *dev_data;
 704
 705         dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, dmi_name, NULL);
 706         if (!dmi_dev) {
 707                 pr_err("failed to find DMI device '%s'\n", dmi_name);
 708                 return -ENOENT;
 709         }
 710
 711         dev_data = dmi_dev->device_data;
 712         if (!dev_data) {
 713                 pr_err("failed to get data from DMI for '%s'\n", dmi_name);
 714                 return -EINVAL;
 715         }
 716
 717         return dev_data->instance;
 718 }
 719
 720 static int __init chromeos_laptop_setup_irq(struct i2c_peripheral *i2c_dev)
 721 {
 722         int irq;
 723
 724         if (i2c_dev->dmi_name) {
 725                 irq = chromeos_laptop_get_irq_from_dmi(i2c_dev->dmi_name);
 726                 if (irq < 0)
 727                         return irq;
 728
 729                 i2c_dev->irq_resource  = (struct resource)
 730                         DEFINE_RES_NAMED(irq, 1, NULL,
 731                                          IORESOURCE_IRQ | i2c_dev->irqflags);
 732                 i2c_dev->board_info.resources = &i2c_dev->irq_resource;
 733                 i2c_dev->board_info.num_resources = 1;
 734         }
 735
 736         return 0;
 737 }
 738
 739 static int __init
 740 chromeos_laptop_prepare_i2c_peripherals(struct chromeos_laptop *cros_laptop,
 741                                         const struct chromeos_laptop *src)
 742 {
 743         struct i2c_peripheral *i2c_dev;
 744         struct i2c_board_info *info;
 745         int i;
 746         int error;
 747
 748         if (!src->num_i2c_peripherals)
 749                 return 0;
 750
 751         cros_laptop->i2c_peripherals = kmemdup(src->i2c_peripherals,
 752                                                src->num_i2c_peripherals *
 753                                                 sizeof(*src->i2c_peripherals),
 754                                                GFP_KERNEL);
 755         if (!cros_laptop->i2c_peripherals)
 756                 return -ENOMEM;
 757
 758         cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals;
 759
 760         for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
 761                 i2c_dev = &cros_laptop->i2c_peripherals[i];
 762                 info = &i2c_dev->board_info;
 763
 764                 error = chromeos_laptop_setup_irq(i2c_dev);
 765                 if (error)
 766                         goto err_out;
 767
 768                 /* Create primary fwnode for the device - copies everything */
 769                 if (i2c_dev->properties) {
 770                         info->fwnode = fwnode_create_software_node(i2c_dev->properties, NULL);
 771                         if (IS_ERR(info->fwnode)) {
 772                                 error = PTR_ERR(info->fwnode);
 773                                 goto err_out;
 774                         }
 775                 }
 776         }
 777
 778         return 0;
 779
 780 err_out:
 781         while (--i >= 0) {
 782                 i2c_dev = &cros_laptop->i2c_peripherals[i];
 783                 info = &i2c_dev->board_info;
 784                 if (!IS_ERR_OR_NULL(info->fwnode))
 785                         fwnode_remove_software_node(info->fwnode);
 786         }
 787         kfree(cros_laptop->i2c_peripherals);
 788         return error;
 789 }
 790
 791 static int __init
 792 chromeos_laptop_prepare_acpi_peripherals(struct chromeos_laptop *cros_laptop,
 793                                         const struct chromeos_laptop *src)
 794 {
 795         struct acpi_peripheral *acpi_peripherals;
 796         struct acpi_peripheral *acpi_dev;
 797         const struct acpi_peripheral *src_dev;
 798         int n_peripherals = 0;
 799         int i;
 800         int error;
 801
 802         for (i = 0; i < src->num_acpi_peripherals; i++) {
 803                 if (acpi_dev_present(src->acpi_peripherals[i].hid, NULL, -1))
 804                         n_peripherals++;
 805         }
 806
 807         if (!n_peripherals)
 808                 return 0;
 809
 810         acpi_peripherals = kcalloc(n_peripherals,
 811                                    sizeof(*src->acpi_peripherals),
 812                                    GFP_KERNEL);
 813         if (!acpi_peripherals)
 814                 return -ENOMEM;
 815
 816         acpi_dev = acpi_peripherals;
 817         for (i = 0; i < src->num_acpi_peripherals; i++) {
 818                 src_dev = &src->acpi_peripherals[i];
 819                 if (!acpi_dev_present(src_dev->hid, NULL, -1))
 820                         continue;
 821
 822                 *acpi_dev = *src_dev;
 823
 824                 /* We need to deep-copy properties */
 825                 if (src_dev->swnode.properties) {
 826                         acpi_dev->swnode.properties =
 827                                 property_entries_dup(src_dev->swnode.properties);
 828                         if (IS_ERR(acpi_dev->swnode.properties)) {
 829                                 error = PTR_ERR(acpi_dev->swnode.properties);
 830                                 goto err_out;
 831                         }
 832                 }
 833
 834                 acpi_dev++;
 835         }
 836
 837         cros_laptop->acpi_peripherals = acpi_peripherals;
 838         cros_laptop->num_acpi_peripherals = n_peripherals;
 839
 840         return 0;
 841
 842 err_out:
 843         while (--i >= 0) {
 844                 acpi_dev = &acpi_peripherals[i];
 845                 if (!IS_ERR_OR_NULL(acpi_dev->swnode.properties))
 846                         property_entries_free(acpi_dev->swnode.properties);
 847         }
 848
 849         kfree(acpi_peripherals);
 850         return error;
 851 }
 852
 853 static void chromeos_laptop_destroy(const struct chromeos_laptop *cros_laptop)
 854 {
 855         const struct acpi_peripheral *acpi_dev;
 856         struct i2c_peripheral *i2c_dev;
 857         int i;
 858
 859         for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) {
 860                 i2c_dev = &cros_laptop->i2c_peripherals[i];
 861                 i2c_unregister_device(i2c_dev->client);
 862         }
 863
 864         for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) {
 865                 acpi_dev = &cros_laptop->acpi_peripherals[i];
 866
 867                 if (acpi_dev->client)
 868                         device_remove_software_node(&acpi_dev->client->dev);
 869
 870                 property_entries_free(acpi_dev->swnode.properties);
 871         }
 872
 873         kfree(cros_laptop->i2c_peripherals);
 874         kfree(cros_laptop->acpi_peripherals);
 875         kfree(cros_laptop);
 876 }
 877
 878 static struct chromeos_laptop * __init
 879 chromeos_laptop_prepare(const struct chromeos_laptop *src)
 880 {
 881         struct chromeos_laptop *cros_laptop;
 882         int error;
 883
 884         cros_laptop = kzalloc(sizeof(*cros_laptop), GFP_KERNEL);
 885         if (!cros_laptop)
 886                 return ERR_PTR(-ENOMEM);
 887
 888         error = chromeos_laptop_prepare_i2c_peripherals(cros_laptop, src);
 889         if (!error)
 890                 error = chromeos_laptop_prepare_acpi_peripherals(cros_laptop,
 891                                                                  src);
 892
 893         if (error) {
 894                 chromeos_laptop_destroy(cros_laptop);
 895                 return ERR_PTR(error);
 896         }
 897
 898         return cros_laptop;
 899 }
 900
 901 static int __init chromeos_laptop_init(void)
 902 {
 903         const struct dmi_system_id *dmi_id;
 904         int error;
 905
 906         dmi_id = dmi_first_match(chromeos_laptop_dmi_table);
 907         if (!dmi_id) {
 908                 pr_debug("unsupported system\n");
 909                 return -ENODEV;
 910         }
 911
 912         pr_debug("DMI Matched %s\n", dmi_id->ident);
 913
 914         cros_laptop = chromeos_laptop_prepare((void *)dmi_id->driver_data);
 915         if (IS_ERR(cros_laptop))
 916                 return PTR_ERR(cros_laptop);
 917
 918         if (!cros_laptop->num_i2c_peripherals &&
 919             !cros_laptop->num_acpi_peripherals) {
 920                 pr_debug("no relevant devices detected\n");
 921                 error = -ENODEV;
 922                 goto err_destroy_cros_laptop;
 923         }
 924
 925         error = bus_register_notifier(&i2c_bus_type,
 926                                       &chromeos_laptop_i2c_notifier);
 927         if (error) {
 928                 pr_err("failed to register i2c bus notifier: %d\n",
 929                        error);
 930                 goto err_destroy_cros_laptop;
 931         }
 932
 933         /*
 934          * Scan adapters that have been registered and clients that have
 935          * been created before we installed the notifier to make sure
 936          * we do not miss any devices.
 937          */
 938         i2c_for_each_dev(NULL, chromeos_laptop_scan_peripherals);
 939
 940         return 0;
 941
 942 err_destroy_cros_laptop:
 943         chromeos_laptop_destroy(cros_laptop);
 944         return error;
 945 }
 946
 947 static void __exit chromeos_laptop_exit(void)
 948 {
 949         bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier);
 950         chromeos_laptop_destroy(cros_laptop);
 951 }
 952
 953 module_init(chromeos_laptop_init);
 954 module_exit(chromeos_laptop_exit);
 955
 956 MODULE_DESCRIPTION("Chrome OS Laptop driver");
 957 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
 958 MODULE_LICENSE("GPL");