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/platform_data/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         "Synopsys DesignWare I2C adapter",
  51         "Synopsys DesignWare I2C adapter",
  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         .suspend_mode           = MXT_SUSPEND_T9_CTRL,
 115 };
 116
 117 static struct i2c_board_info atmel_224s_tp_device = {
 118         I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
 119         .platform_data = &atmel_224s_tp_platform_data,
 120         .flags          = I2C_CLIENT_WAKE,
 121 };
 122
 123 static struct mxt_platform_data atmel_1664s_platform_data = {
 124         .irqflags               = IRQF_TRIGGER_FALLING,
 125         .suspend_mode           = MXT_SUSPEND_T9_CTRL,
 126 };
 127
 128 static struct i2c_board_info atmel_1664s_device = {
 129         I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
 130         .platform_data = &atmel_1664s_platform_data,
 131         .flags          = I2C_CLIENT_WAKE,
 132 };
 133
 134 static struct i2c_client *__add_probed_i2c_device(
 135                 const char *name,
 136                 int bus,
 137                 struct i2c_board_info *info,
 138                 const unsigned short *alt_addr_list)
 139 {
 140         const struct dmi_device *dmi_dev;
 141         const struct dmi_dev_onboard *dev_data;
 142         struct i2c_adapter *adapter;
 143         struct i2c_client *client = NULL;
 144         const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };
 145
 146         if (bus < 0)
 147                 return NULL;
 148         /*
 149          * If a name is specified, look for irq platform information stashed
 150          * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
 151          */
 152         if (name) {
 153                 dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
 154                 if (!dmi_dev) {
 155                         pr_err("%s failed to dmi find device %s.\n",
 156                                __func__,
 157                                name);
 158                         return NULL;
 159                 }
 160                 dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
 161                 if (!dev_data) {
 162                         pr_err("%s failed to get data from dmi for %s.\n",
 163                                __func__, name);
 164                         return NULL;
 165                 }
 166                 info->irq = dev_data->instance;
 167         }
 168
 169         adapter = i2c_get_adapter(bus);
 170         if (!adapter) {
 171                 pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
 172                 return NULL;
 173         }
 174
 175         /*
 176          * Add the i2c device. If we can't detect it at the primary
 177          * address we scan secondary addresses. In any case the client
 178          * structure gets assigned primary address.
 179          */
 180         client = i2c_new_probed_device(adapter, info, addr_list, NULL);
 181         if (!client && alt_addr_list) {
 182                 struct i2c_board_info dummy_info = {
 183                         I2C_BOARD_INFO("dummy", info->addr),
 184                 };
 185                 struct i2c_client *dummy;
 186
 187                 dummy = i2c_new_probed_device(adapter, &dummy_info,
 188                                               alt_addr_list, NULL);
 189                 if (dummy) {
 190                         pr_debug("%s %d-%02x is probed at %02x\n",
 191                                   __func__, bus, info->addr, dummy->addr);
 192                         i2c_unregister_device(dummy);
 193                         client = i2c_new_device(adapter, info);
 194                 }
 195         }
 196
 197         if (!client)
 198                 pr_notice("%s failed to register device %d-%02x\n",
 199                           __func__, bus, info->addr);
 200         else
 201                 pr_debug("%s added i2c device %d-%02x\n",
 202                          __func__, bus, info->addr);
 203
 204         i2c_put_adapter(adapter);
 205         return client;
 206 }
 207
 208 struct i2c_lookup {
 209         const char *name;
 210         int instance;
 211         int n;
 212 };
 213
 214 static int __find_i2c_adap(struct device *dev, void *data)
 215 {
 216         struct i2c_lookup *lookup = data;
 217         static const char *prefix = "i2c-";
 218         struct i2c_adapter *adapter;
 219
 220         if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
 221                 return 0;
 222         adapter = to_i2c_adapter(dev);
 223         if (strncmp(adapter->name, lookup->name, strlen(lookup->name)) == 0 &&
 224             lookup->n++ == lookup->instance)
 225                 return 1;
 226         return 0;
 227 }
 228
 229 static int find_i2c_adapter_num(enum i2c_adapter_type type)
 230 {
 231         struct device *dev = NULL;
 232         struct i2c_adapter *adapter;
 233         struct i2c_lookup lookup;
 234
 235         memset(&lookup, 0, sizeof(lookup));
 236         lookup.name = i2c_adapter_names[type];
 237         lookup.instance = (type == I2C_ADAPTER_DESIGNWARE_1) ? 1 : 0;
 238
 239         /* find the adapter by name */
 240         dev = bus_find_device(&i2c_bus_type, NULL, &lookup, __find_i2c_adap);
 241         if (!dev) {
 242                 /* Adapters may appear later. Deferred probing will retry */
 243                 pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
 244                           lookup.name);
 245                 return -ENODEV;
 246         }
 247         adapter = to_i2c_adapter(dev);
 248         return adapter->nr;
 249 }
 250
 251 /*
 252  * Takes a list of addresses in addrs as such :
 253  * { addr1, ... , addrn, I2C_CLIENT_END };
 254  * add_probed_i2c_device will use i2c_new_probed_device
 255  * and probe for devices at all of the addresses listed.
 256  * Returns NULL if no devices found.
 257  * See Documentation/i2c/instantiating-devices for more information.
 258  */
 259 static struct i2c_client *add_probed_i2c_device(
 260                 const char *name,
 261                 enum i2c_adapter_type type,
 262                 struct i2c_board_info *info,
 263                 const unsigned short *addrs)
 264 {
 265         return __add_probed_i2c_device(name,
 266                                        find_i2c_adapter_num(type),
 267                                        info,
 268                                        addrs);
 269 }
 270
 271 /*
 272  * Probes for a device at a single address, the one provided by
 273  * info->addr.
 274  * Returns NULL if no device found.
 275  */
 276 static struct i2c_client *add_i2c_device(const char *name,
 277                                                 enum i2c_adapter_type type,
 278                                                 struct i2c_board_info *info)
 279 {
 280         return __add_probed_i2c_device(name,
 281                                        find_i2c_adapter_num(type),
 282                                        info,
 283                                        NULL);
 284 }
 285
 286 static int setup_cyapa_tp(enum i2c_adapter_type type)
 287 {
 288         if (tp)
 289                 return 0;
 290
 291         /* add cyapa touchpad */
 292         tp = add_i2c_device("trackpad", type, &cyapa_device);
 293         return (!tp) ? -EAGAIN : 0;
 294 }
 295
 296 static int setup_atmel_224s_tp(enum i2c_adapter_type type)
 297 {
 298         const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
 299                                              I2C_CLIENT_END };
 300         if (tp)
 301                 return 0;
 302
 303         /* add atmel mxt touchpad */
 304         tp = add_probed_i2c_device("trackpad", type,
 305                                    &atmel_224s_tp_device, addr_list);
 306         return (!tp) ? -EAGAIN : 0;
 307 }
 308
 309 static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
 310 {
 311         const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
 312                                              I2C_CLIENT_END };
 313         if (ts)
 314                 return 0;
 315
 316         /* add atmel mxt touch device */
 317         ts = add_probed_i2c_device("touchscreen", type,
 318                                    &atmel_1664s_device, addr_list);
 319         return (!ts) ? -EAGAIN : 0;
 320 }
 321
 322 static int setup_isl29018_als(enum i2c_adapter_type type)
 323 {
 324         if (als)
 325                 return 0;
 326
 327         /* add isl29018 light sensor */
 328         als = add_i2c_device("lightsensor", type, &isl_als_device);
 329         return (!als) ? -EAGAIN : 0;
 330 }
 331
 332 static int setup_tsl2583_als(enum i2c_adapter_type type)
 333 {
 334         if (als)
 335                 return 0;
 336
 337         /* add tsl2583 light sensor */
 338         als = add_i2c_device(NULL, type, &tsl2583_als_device);
 339         return (!als) ? -EAGAIN : 0;
 340 }
 341
 342 static int setup_tsl2563_als(enum i2c_adapter_type type)
 343 {
 344         if (als)
 345                 return 0;
 346
 347         /* add tsl2563 light sensor */
 348         als = add_i2c_device(NULL, type, &tsl2563_als_device);
 349         return (!als) ? -EAGAIN : 0;
 350 }
 351
 352 static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
 353 {
 354         cros_laptop = (void *)id->driver_data;
 355         pr_debug("DMI Matched %s.\n", id->ident);
 356
 357         /* Indicate to dmi_scan that processing is done. */
 358         return 1;
 359 }
 360
 361 static int chromeos_laptop_probe(struct platform_device *pdev)
 362 {
 363         int i;
 364         int ret = 0;
 365
 366         for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
 367                 struct i2c_peripheral *i2c_dev;
 368
 369                 i2c_dev = &cros_laptop->i2c_peripherals[i];
 370
 371                 /* No more peripherals. */
 372                 if (i2c_dev->add == NULL)
 373                         break;
 374
 375                 if (i2c_dev->state == TIMEDOUT || i2c_dev->state == PROBED)
 376                         continue;
 377
 378                 /*
 379                  * Check that the i2c adapter is present.
 380                  * -EPROBE_DEFER if missing as the adapter may appear much
 381                  * later.
 382                  */
 383                 if (find_i2c_adapter_num(i2c_dev->type) == -ENODEV) {
 384                         ret = -EPROBE_DEFER;
 385                         continue;
 386                 }
 387
 388                 /* Add the device. */
 389                 if (i2c_dev->add(i2c_dev->type) == -EAGAIN) {
 390                         /*
 391                          * Set -EPROBE_DEFER a limited num of times
 392                          * if device is not successfully added.
 393                          */
 394                         if (++i2c_dev->tries < MAX_I2C_DEVICE_DEFERRALS) {
 395                                 ret = -EPROBE_DEFER;
 396                         } else {
 397                                 /* Ran out of tries. */
 398                                 pr_notice("%s: Ran out of tries for device.\n",
 399                                           __func__);
 400                                 i2c_dev->state = TIMEDOUT;
 401                         }
 402                 } else {
 403                         i2c_dev->state = PROBED;
 404                 }
 405         }
 406
 407         return ret;
 408 }
 409
 410 static struct chromeos_laptop samsung_series_5_550 = {
 411         .i2c_peripherals = {
 412                 /* Touchpad. */
 413                 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
 414                 /* Light Sensor. */
 415                 { .add = setup_isl29018_als, I2C_ADAPTER_SMBUS },
 416         },
 417 };
 418
 419 static struct chromeos_laptop samsung_series_5 = {
 420         .i2c_peripherals = {
 421                 /* Light Sensor. */
 422                 { .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
 423         },
 424 };
 425
 426 static struct chromeos_laptop chromebook_pixel = {
 427         .i2c_peripherals = {
 428                 /* Touch Screen. */
 429                 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
 430                 /* Touchpad. */
 431                 { .add = setup_atmel_224s_tp, I2C_ADAPTER_VGADDC },
 432                 /* Light Sensor. */
 433                 { .add = setup_isl29018_als, I2C_ADAPTER_PANEL },
 434         },
 435 };
 436
 437 static struct chromeos_laptop hp_chromebook_14 = {
 438         .i2c_peripherals = {
 439                 /* Touchpad. */
 440                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 441         },
 442 };
 443
 444 static struct chromeos_laptop dell_chromebook_11 = {
 445         .i2c_peripherals = {
 446                 /* Touchpad. */
 447                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 448         },
 449 };
 450
 451 static struct chromeos_laptop toshiba_cb35 = {
 452         .i2c_peripherals = {
 453                 /* Touchpad. */
 454                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 455         },
 456 };
 457
 458 static struct chromeos_laptop acer_c7_chromebook = {
 459         .i2c_peripherals = {
 460                 /* Touchpad. */
 461                 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
 462         },
 463 };
 464
 465 static struct chromeos_laptop acer_ac700 = {
 466         .i2c_peripherals = {
 467                 /* Light Sensor. */
 468                 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
 469         },
 470 };
 471
 472 static struct chromeos_laptop acer_c720 = {
 473         .i2c_peripherals = {
 474                 /* Touchscreen. */
 475                 { .add = setup_atmel_1664s_ts, I2C_ADAPTER_DESIGNWARE_1 },
 476                 /* Touchpad. */
 477                 { .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
 478                 /* Light Sensor. */
 479                 { .add = setup_isl29018_als, I2C_ADAPTER_DESIGNWARE_1 },
 480         },
 481 };
 482
 483 static struct chromeos_laptop hp_pavilion_14_chromebook = {
 484         .i2c_peripherals = {
 485                 /* Touchpad. */
 486                 { .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
 487         },
 488 };
 489
 490 static struct chromeos_laptop cr48 = {
 491         .i2c_peripherals = {
 492                 /* Light Sensor. */
 493                 { .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
 494         },
 495 };
 496
 497 #define _CBDD(board_) \
 498         .callback = chromeos_laptop_dmi_matched, \
 499         .driver_data = (void *)&board_
 500
 501 static struct dmi_system_id chromeos_laptop_dmi_table[] __initdata = {
 502         {
 503                 .ident = "Samsung Series 5 550",
 504                 .matches = {
 505                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
 506                         DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
 507                 },
 508                 _CBDD(samsung_series_5_550),
 509         },
 510         {
 511                 .ident = "Samsung Series 5",
 512                 .matches = {
 513                         DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
 514                 },
 515                 _CBDD(samsung_series_5),
 516         },
 517         {
 518                 .ident = "Chromebook Pixel",
 519                 .matches = {
 520                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 521                         DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
 522                 },
 523                 _CBDD(chromebook_pixel),
 524         },
 525         {
 526                 .ident = "Wolf",
 527                 .matches = {
 528                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 529                         DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
 530                 },
 531                 _CBDD(dell_chromebook_11),
 532         },
 533         {
 534                 .ident = "HP Chromebook 14",
 535                 .matches = {
 536                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 537                         DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
 538                 },
 539                 _CBDD(hp_chromebook_14),
 540         },
 541         {
 542                 .ident = "Toshiba CB35",
 543                 .matches = {
 544                         DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 545                         DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
 546                 },
 547                 _CBDD(toshiba_cb35),
 548         },
 549         {
 550                 .ident = "Acer C7 Chromebook",
 551                 .matches = {
 552                         DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
 553                 },
 554                 _CBDD(acer_c7_chromebook),
 555         },
 556         {
 557                 .ident = "Acer AC700",
 558                 .matches = {
 559                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 560                 },
 561                 _CBDD(acer_ac700),
 562         },
 563         {
 564                 .ident = "Acer C720",
 565                 .matches = {
 566                         DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
 567                 },
 568                 _CBDD(acer_c720),
 569         },
 570         {
 571                 .ident = "HP Pavilion 14 Chromebook",
 572                 .matches = {
 573                         DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
 574                 },
 575                 _CBDD(hp_pavilion_14_chromebook),
 576         },
 577         {
 578                 .ident = "Cr-48",
 579                 .matches = {
 580                         DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
 581                 },
 582                 _CBDD(cr48),
 583         },
 584         { }
 585 };
 586 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);
 587
 588 static struct platform_device *cros_platform_device;
 589
 590 static struct platform_driver cros_platform_driver = {
 591         .driver = {
 592                 .name = "chromeos_laptop",
 593         },
 594         .probe = chromeos_laptop_probe,
 595 };
 596
 597 static int __init chromeos_laptop_init(void)
 598 {
 599         int ret;
 600
 601         if (!dmi_check_system(chromeos_laptop_dmi_table)) {
 602                 pr_debug("%s unsupported system.\n", __func__);
 603                 return -ENODEV;
 604         }
 605
 606         ret = platform_driver_register(&cros_platform_driver);
 607         if (ret)
 608                 return ret;
 609
 610         cros_platform_device = platform_device_alloc("chromeos_laptop", -1);
 611         if (!cros_platform_device) {
 612                 ret = -ENOMEM;
 613                 goto fail_platform_device1;
 614         }
 615
 616         ret = platform_device_add(cros_platform_device);
 617         if (ret)
 618                 goto fail_platform_device2;
 619
 620         return 0;
 621
 622 fail_platform_device2:
 623         platform_device_put(cros_platform_device);
 624 fail_platform_device1:
 625         platform_driver_unregister(&cros_platform_driver);
 626         return ret;
 627 }
 628
 629 static void __exit chromeos_laptop_exit(void)
 630 {
 631         if (als)
 632                 i2c_unregister_device(als);
 633         if (tp)
 634                 i2c_unregister_device(tp);
 635         if (ts)
 636                 i2c_unregister_device(ts);
 637
 638         platform_device_unregister(cros_platform_device);
 639         platform_driver_unregister(&cros_platform_driver);
 640 }
 641
 642 module_init(chromeos_laptop_init);
 643 module_exit(chromeos_laptop_exit);
 644
 645 MODULE_DESCRIPTION("Chrome OS Laptop driver");
 646 MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
 647 MODULE_LICENSE("GPL");