kernel/drivers/platform/chrome/chromeos_laptop.c

   1 /*
   2  *  chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices.
   3  *
   4  *  Author : Benson Leung <bleung@chromium.org>
   5  *
   6  *  Copyright (C) 2012 Google, Inc.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/dmi.h>
  25 #include <linux/i2c.h>
  26 #include <linux/i2c/atmel_mxt_ts.h>
  27 #include <linux/input.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/module.h>
  30 #include <linux/platform_device.h>
  31
  32 #define ATMEL_TP_I2C_ADDR       0x4b
  33 #define ATMEL_TP_I2C_BL_ADDR    0x25
  34 #define ATMEL_TS_I2C_ADDR       0x4a
  35 #define ATMEL_TS_I2C_BL_ADDR    0x26
  36 #define CYAPA_TP_I2C_ADDR       0x67
  37 #define ISL_ALS_I2C_ADDR        0x44
  38 #define TAOS_ALS_I2C_ADDR       0x29
  39
  40 #define MAX_I2C_DEVICE_DEFERRALS        5
  41
  42 static struct i2c_client *als;
  43 static struct i2c_client *tp;
  44 static struct i2c_client *ts;
  45
  46 static const char *i2c_adapter_names[] = {
  47         "SMBus I801 adapter",
  48         "i915 gmbus vga",
  49         "i915 gmbus panel",
  50         "i2c-designware-pci",
  51         "i2c-designware-pci",
  52 };
  53
  54 /* Keep this enum consistent with i2c_adapter_names */
  55 enum i2c_adapter_type {
  56         I2C_ADAPTER_SMBUS = 0,
  57         I2C_ADAPTER_VGADDC,
  58         I2C_ADAPTER_PANEL,
  59         I2C_ADAPTER_DESIGNWARE_0,
  60         I2C_ADAPTER_DESIGNWARE_1,
  61 };
  62
  63 enum i2c_peripheral_state {
  64         UNPROBED = 0,
  65         PROBED,
  66         TIMEDOUT,
  67 };
  68
  69 struct i2c_peripheral {
  70         int (*add)(enum i2c_adapter_type type);
  71         enum i2c_adapter_type type;
  72         enum i2c_peripheral_state state;
  73         int tries;
  74 };
  75
  76 #define MAX_I2C_PERIPHERALS 3
  77
  78 struct chromeos_laptop {
  79         struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
  80 };
  81
  82 static struct chromeos_laptop *cros_laptop;
  83
  84 static struct i2c_board_info cyapa_device = {
  85         I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
  86         .flags          = I2C_CLIENT_WAKE,
  87 };
  88
  89 static struct i2c_board_info isl_als_device = {
  90         I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
  91 };
  92
  93 static struct i2c_board_info tsl2583_als_device = {
  94         I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
  95 };
  96
  97 static struct i2c_board_info tsl2563_als_device = {
  98         I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
  99 };
 100
 101 static int mxt_t19_keys[] = {
 102         KEY_RESERVED,
 103         KEY_RESERVED,
 104         KEY_RESERVED,
 105         KEY_RESERVED,
 106         KEY_RESERVED,
 107         BTN_LEFT
 108 };
 109
 110 static struct mxt_platform_data atmel_224s_tp_platform_data = {
 111         .irqflags               = IRQF_TRIGGER_FALLING,
 112         .t19_num_keys           = ARRAY_SIZE(mxt_t19_keys),
 113         .t19_keymap             = mxt_t19_keys,
 114 };
 115
 116 static struct i2c_board_info atmel_224s_tp_device = {
 117         I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
 118         .platform_data = &atmel_224s_tp_platform_data,
 119         .flags          = I2C_CLIENT_WAKE,
 120 };
 121
 122 static struct mxt_platform_data atmel_1664s_platform_data = {
 123         .irqflags               = IRQF_TRIGGER_FALLING,
 124 };
 125
 126 static struct i2c_board_info atmel_1664s_device = {
 127         I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
 128         .platform_data = &atmel_1664s_platform_data,
 129         .flags          = I2C_CLIENT_WAKE,
 130 };
 131
 132 static struct i2c_client *__add_probed_i2c_device(
 133                 const char *name,
 134                 int bus,
 135                 struct i2c_board_info *info,
 136                 const unsigned short *alt_addr_list)
 137 {
 138         const struct dmi_device *dmi_dev;
 139         const struct dmi_dev_onboard *dev_data;
 140         struct i2c_adapter *adapter;
 141         struct i2c_client *client = NULL;
 142         const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
 143
 144         if (bus < 0)
 145                 return NULL;
 146         /*
 147          * If a name is specified, look for irq platform information stashed
 148          * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
 149          */
 150         if (name) {
 151                 dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
 152                 if (!dmi_dev) {
 153                         pr_err("%s failed to dmi find device %s.\n",
 154                                __func__,
 155                                name);
 156                         return NULL;
 157                 }
 158                 dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
 159                 if (!dev_data) {
 160                         pr_err("%s failed to get data from dmi for %s.\n",
 161                                __func__, name);
 162                         return NULL;
 163                 }
 164                 info->irq = dev_data->instance;
 165         }
 166
 167         adapter = i2c_get_adapter(bus);
 168         if (!adapter) {
 169                 pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
 170                 return NULL;
 171         }
 172
 173         /*
 174          * Add the i2c device. If we can't detect it at the primary
 175          * address we scan secondary addresses. In any case the client
 176          * structure gets assigned primary address.
 177          */
 178         client = i2c_new_probed_device(adapter, info, addr_list, NULL);
 179         if (!client && alt_addr_list) {
 180                 struct i2c_board_info dummy_info = {
 181                         I2C_BOARD_INFO("dummy", info->addr),
 182                 };
 183                 struct i2c_client *dummy;
 184
 185                 dummy = i2c_new_probed_device(adapter, &dummy_info,
 186                                               alt_addr_list, NULL);
 187                 if (dummy) {
 188                         pr_debug("%s %d-%02x is probed at %02x\n",
 189                                   __func__, bus, info->addr, dummy->addr);
 190                         i2c_unregister_device(dummy);
 191                         client = i2c_new_device(adapter, info);
 192                 }
 193         }
 194
 195         if (!client)
 196                 pr_notice("%s failed to register device %d-%02x\n",
 197                           __func__, bus, info->addr);
 198         else
 199                 pr_debug("%s added i2c device %d-%02x\n",
 200                          __func__, bus, info->addr);
 201
 202         i2c_put_adapter(adapter);
 203         return client;
 204 }
 205
 206 struct i2c_lookup {
 207         const char *name;
 208         int instance;
 209         int n;
 210 };
 211
 212 static int __find_i2c_adap(struct device *dev, void *data)
 213 {
 214         struct i2c_lookup *lookup = data;
 215         static const char *prefix = "i2c-";
 216         struct i2c_adapter *adapter;
 217
 218         if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
 219                 return 0;
 220         adapter = to_i2c_adapter(dev);
 221         if (strncmp(adapter->name, lookup->name, strlen(lookup->name)) == 0 &&
 222             lookup->n++ == lookup->instance)
 223                 return 1;
 224         return 0;
 225 }
 226
 227 static int find_i2c_adapter_num(enum i2c_adapter_type type)
 228 {
 229         struct device *dev = NULL;
 230         struct i2c_adapter *adapter;
 231         struct i2c_lookup lookup;
 232
 233         memset(&lookup, 0, sizeof(lookup));
 234         lookup.name = i2c_adapter_names[type];
 235         lookup.instance = (type == I2C_ADAPTER_DESIGNWARE_1) ? 1 : 0;
 236
 237         /* find the adapter by name */
 238         dev = bus_find_device(&i2c_bus_type, NULL, &lookup, __find_i2c_adap);
 239         if (!dev) {
 240                 /* Adapters may appear later. Deferred probing will retry */
 241                 pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
 242                           lookup.name);
 243                 return -ENODEV;
 244         }
 245         adapter = to_i2c_adapter(dev);
 246         return adapter->nr;
 247 }
 248
 249 /*
 250  * Takes a list of addresses in addrs as such :
 251  * { addr1, ... , addrn, I2C_CLIENT_END };
 252  * add_probed_i2c_device will use i2c_new_probed_device
 253  * and probe for devices at all of the addresses listed.
 254  * Returns NULL if no devices found.
 255  * See Documentation/i2c/instantiating-devices for more information.
 256  */
 257 static struct i2c_client *add_probed_i2c_device(
 258                 const char *name,
 259                 enum i2c_adapter_type type,
 260                 struct i2c_board_info *info,
 261                 const unsigned short *addrs)
 262 {
 263         return __add_probed_i2c_device(name,
 264                                        find_i2c_adapter_num(type),
 265                                        info,
 266                                        addrs);
 267 }
 268
 269 /*
 270  * Probes for a device at a single address, the one provided by
 271  * info->addr.
 272  * Returns NULL if no device found.
 273  */
 274 static struct i2c_client *add_i2c_device(const char *name,
 275                                                 enum i2c_adapter_type type,
 276                                                 struct i2c_board_info *info)
 277 {
 278         return __add_probed_i2c_device(name,
 279                                        find_i2c_adapter_num(type),
 280                                        info,
 281                                        NULL);
 282 }
 283
 284 static int setup_cyapa_tp(enum i2c_adapter_type type)
 285 {
 286         if (tp)
 287                 return 0;
 288
 289         /* add cyapa touchpad */
 290         tp = add_i2c_device("trackpad", type, &cyapa_device);
 291         return (!tp) ? -EAGAIN : 0;
 292 }
 293
 294 static int setup_atmel_224s_tp(enum i2c_adapter_type type)
 295 {
 296         const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
 297                                              I2C_CLIENT_END };
 298         if (tp)
 299                 return 0;
 300
 301         /* add atmel mxt touchpad */
 302         tp = add_probed_i2c_device("trackpad", type,
 303                                    &atmel_224s_tp_device, addr_list);
 304         return (!tp) ? -EAGAIN : 0;
 305 }
 306
 307 static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
 308 {
 309         const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
 310                                              I2C_CLIENT_END };
 311         if (ts)
 312                 return 0;
 313
 314         /* add atmel mxt touch device */
 315         ts = add_probed_i2c_device("touchscreen", type,
 316                                    &atmel_1664s_device, addr_list);
 317         return (!ts) ? -EAGAIN : 0;
 318 }
 319
 320 static int setup_isl29018_als(enum i2c_adapter_type type)
 321 {
 322         if (als)
 323                 return 0;
 324
 325         /* add isl29018 light sensor */
 326         als = add_i2c_device("lightsensor", type, &isl_als_device);
 327         return (!als) ? -EAGAIN : 0;
 328 }
 329
 330 static int setup_tsl2583_als(enum i2c_adapter_type type)
 331 {
 332         if (als)
 333                 return 0;
 334
 335         /* add tsl2583 light sensor */
 336         als = add_i2c_device(NULL, type, &tsl2583_als_device);
 337         return (!als) ? -EAGAIN : 0;
 338 }
 339
 340 static int setup_tsl2563_als(enum i2c_adapter_type type)
 341 {
 342         if (als)
 343                 return 0;
 344
 345         /* add tsl2563 light sensor */
 346         als = add_i2c_device(NULL, type, &tsl2563_als_device);
 347         return (!als) ? -EAGAIN : 0;
 348 }
 349
 350 static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
 351 {
 352         cros_laptop = (void *)id->driver_data;
 353         pr_debug("DMI Matched %s.\n", id->ident);
 354
 355         /* Indicate to dmi_scan that processing is done. */
 356         return 1;
 357 }
 358
 359 static int chromeos_laptop_probe(struct platform_device *pdev)
 360 {
 361         int i;
 362         int ret = 0;
 363
 364         for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
 365                 struct i2c_peripheral *i2c_dev;
 366
 367                 i2c_dev = &cros_laptop->i2c_peripherals[i];
 368
 369                 /* No more peripherals. */
 370                 if (i2c_dev->add == NULL)
 371                         break;
 372
 373                 if (i2c_dev->state == TIMEDOUT || i2c_dev->state == PROBED)
 374                         continue;
 375
 376                 /*
 377                  * Check that the i2c adapter is present.
 378                  * -EPROBE_DEFER if missing as the adapter may appear much
 379                  * later.
 380                  */
 381                 if (find_i2c_adapter_num(i2c_dev->type) == -ENODEV) {
 382                         ret = -EPROBE_DEFER;
 383                         continue;
 384                 }
 385
 386                 /* Add the device. */
 387                 if (i2c_dev->add(i2c_dev->type) == -EAGAIN) {
 388                         /*
 389                          * Set -EPROBE_DEFER a limited num of times
 390                          * if device is not successfully added.
 391                          */
 392                         if (++i2c_dev->tries < MAX_I2C_DEVICE_DEFERRALS) {
 393                                 ret = -EPROBE_DEFER;
 394                         } else {
 395                                 /* Ran out of tries. */
 396                                 pr_notice("%s: Ran out of tries for device.\n",
 397                                           __func__);
 398                                 i2c_dev->state = TIMEDOUT;
 399                         }
 400                 } else {
 401                         i2c_dev->state = PROBED;
 402                 }
 403         }
 404
 405         return ret;
 406 }
 407
 408 static struct chromeos_laptop samsung_series_5_550 = {
 409         .i2c_peripherals = {
 410                 /* Touchpad. */
 411                 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
 412                 /* Light Sensor. */
 413                 { .add = setup_isl29018_als, I2C_ADAPTER_SMBUS },
 414         },
 415 };
 416
 417 static struct chromeos_laptop samsung_series_5 = {
 418         .i2c_peripherals = {
 419                 /* Light Sensor. */
 420                 { .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
 421         },
 422 };
 423
 424 static struct chromeos_laptop chromebook_pixel = {
 425         .i2c_peripherals = {
 426                 /* Touch Screen. */
 427                 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
 428                 /* Touchpad. */
 429                 { .add = setup_atmel_224s_tp, I2C_ADAPTER_VGADDC },
 430                 /* Light Sensor. */
 431                 { .add = setup_isl29018_als, I2C_ADAPTER_PANEL },
 432         },
 433 };
 434
 435 static struct chromeos_laptop hp_chromebook_14 = {
 436         .i2c_peripherals = {
 437                 /* Touchpad. */
 438                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 439         },
 440 };
 441
 442 static struct chromeos_laptop dell_chromebook_11 = {
 443         .i2c_peripherals = {
 444                 /* Touchpad. */
 445                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 446         },
 447 };
 448
 449 static struct chromeos_laptop toshiba_cb35 = {
 450         .i2c_peripherals = {
 451                 /* Touchpad. */
 452                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 453         },
 454 };
 455
 456 static struct chromeos_laptop acer_c7_chromebook = {
 457         .i2c_peripherals = {
 458                 /* Touchpad. */
 459                 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
 460         },
 461 };
 462
 463 static struct chromeos_laptop acer_ac700 = {
 464         .i2c_peripherals = {
 465                 /* Light Sensor. */
 466                 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
 467         },
 468 };
 469
 470 static struct chromeos_laptop acer_c720 = {
 471         .i2c_peripherals = {
 472                 /* Touchscreen. */
 473                 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_DESIGNWARE_1 },
 474                 /* Touchpad. */
 475                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 476                 /* Light Sensor. */
 477                 { .add = setup_isl29018_als, I2C_ADAPTER_DESIGNWARE_1 },
 478         },
 479 };
 480
 481 static struct chromeos_laptop hp_pavilion_14_chromebook = {
 482         .i2c_peripherals = {
 483                 /* Touchpad. */
 484                 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
 485         },
 486 };
 487
 488 static struct chromeos_laptop cr48 = {
 489         .i2c_peripherals = {
 490                 /* Light Sensor. */
 491                 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
 492         },
 493 };
 494
 495 #define _CBDD(board_) \
 496         .callback = chromeos_laptop_dmi_matched, \
 497         .driver_data = (void *)&board_
 498
 499 static struct dmi_system_id chromeos_laptop_dmi_table[] __initdata = {
 500         {
 501                 .ident = "Samsung Series 5 550",
 502                 .matches = {
 503                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
 504                         DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
 505                 },
 506                 _CBDD(samsung_series_5_550),
 507         },
 508         {
 509                 .ident = "Samsung Series 5",
 510                 .matches = {
 511                         DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
 512                 },
 513                 _CBDD(samsung_series_5),
 514         },
 515         {
 516                 .ident = "Chromebook Pixel",
 517                 .matches = {
 518                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 519                         DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
 520                 },
 521                 _CBDD(chromebook_pixel),
 522         },
 523         {
 524                 .ident = "Wolf",
 525                 .matches = {
 526                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 527                         DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
 528                 },
 529                 _CBDD(dell_chromebook_11),
 530         },
 531         {
 532                 .ident = "HP Chromebook 14",
 533                 .matches = {
 534                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 535                         DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
 536                 },
 537                 _CBDD(hp_chromebook_14),
 538         },
 539         {
 540                 .ident = "Toshiba CB35",
 541                 .matches = {
 542                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 543                         DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
 544                 },
 545                 _CBDD(toshiba_cb35),
 546         },
 547         {
 548                 .ident = "Acer C7 Chromebook",
 549                 .matches = {
 550                         DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
 551                 },
 552                 _CBDD(acer_c7_chromebook),
 553         },
 554         {
 555                 .ident = "Acer AC700",
 556                 .matches = {
 557                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 558                 },
 559                 _CBDD(acer_ac700),
 560         },
 561         {
 562                 .ident = "Acer C720",
 563                 .matches = {
 564                         DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
 565                 },
 566                 _CBDD(acer_c720),
 567         },
 568         {
 569                 .ident = "HP Pavilion 14 Chromebook",
 570                 .matches = {
 571                         DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
 572                 },
 573                 _CBDD(hp_pavilion_14_chromebook),
 574         },
 575         {
 576                 .ident = "Cr-48",
 577                 .matches = {
 578                         DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
 579                 },
 580                 _CBDD(cr48),
 581         },
 582         { }
 583 };
 584 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
 585
 586 static struct platform_device *cros_platform_device;
 587
 588 static struct platform_driver cros_platform_driver = {
 589         .driver = {
 590                 .name = "chromeos_laptop",
 591         },
 592         .probe = chromeos_laptop_probe,
 593 };
 594
 595 static int __init chromeos_laptop_init(void)
 596 {
 597         int ret;
 598
 599         if (!dmi_check_system(chromeos_laptop_dmi_table)) {
 600                 pr_debug("%s unsupported system.\n", __func__);
 601                 return -ENODEV;
 602         }
 603
 604         ret = platform_driver_register(&cros_platform_driver);
 605         if (ret)
 606                 return ret;
 607
 608         cros_platform_device = platform_device_alloc("chromeos_laptop", -1);
 609         if (!cros_platform_device) {
 610                 ret = -ENOMEM;
 611                 goto fail_platform_device1;
 612         }
 613
 614         ret = platform_device_add(cros_platform_device);
 615         if (ret)
 616                 goto fail_platform_device2;
 617
 618         return 0;
 619
 620 fail_platform_device2:
 621         platform_device_put(cros_platform_device);
 622 fail_platform_device1:
 623         platform_driver_unregister(&cros_platform_driver);
 624         return ret;
 625 }
 626
 627 static void __exit chromeos_laptop_exit(void)
 628 {
 629         if (als)
 630                 i2c_unregister_device(als);
 631         if (tp)
 632                 i2c_unregister_device(tp);
 633         if (ts)
 634                 i2c_unregister_device(ts);
 635
 636         platform_device_unregister(cros_platform_device);
 637         platform_driver_unregister(&cros_platform_driver);
 638 }
 639
 640 module_init(chromeos_laptop_init);
 641 module_exit(chromeos_laptop_exit);
 642
 643 MODULE_DESCRIPTION("Chrome OS Laptop driver");
 644 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
 645 MODULE_LICENSE("GPL");