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