1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Driver for Dell laptop extras
   4 *
   5 *  Copyright (c) Red Hat <mjg@redhat.com>
   6 *  Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
   7 *  Copyright (c) 2014 Pali Rohár <pali@kernel.org>
   8 *
   9 *  Based on documentation in the libsmbios package:
  10 *  Copyright (C) 2005-2014 Dell Inc.
  11 */
  12
  13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15#include <linux/module.h>
  16#include <linux/kernel.h>
  17#include <linux/init.h>
  18#include <linux/platform_device.h>
  19#include <linux/backlight.h>
  20#include <linux/err.h>
  21#include <linux/dmi.h>
  22#include <linux/io.h>
  23#include <linux/rfkill.h>
  24#include <linux/power_supply.h>
  25#include <linux/acpi.h>
  26#include <linux/mm.h>
  27#include <linux/i8042.h>
  28#include <linux/debugfs.h>
  29#include <linux/seq_file.h>
  30#include <acpi/video.h>
  31#include "dell-rbtn.h"
  32#include "dell-smbios.h"
  33
  34#include "dell-wmi-privacy.h"
  35
  36struct quirk_entry {
  37	bool touchpad_led;
  38	bool kbd_led_not_present;
  39	bool kbd_led_levels_off_1;
  40	bool kbd_missing_ac_tag;
  41
  42	bool needs_kbd_timeouts;
  43	/*
  44	 * Ordered list of timeouts expressed in seconds.
  45	 * The list must end with -1
  46	 */
  47	int kbd_timeouts[];
  48};
  49
  50static struct quirk_entry *quirks;
  51
  52static struct quirk_entry quirk_dell_vostro_v130 = {
  53	.touchpad_led = true,
  54};
  55
  56static int __init dmi_matched(const struct dmi_system_id *dmi)
  57{
  58	quirks = dmi->driver_data;
  59	return 1;
  60}
  61
  62/*
  63 * These values come from Windows utility provided by Dell. If any other value
  64 * is used then BIOS silently set timeout to 0 without any error message.
  65 */
  66static struct quirk_entry quirk_dell_xps13_9333 = {
  67	.needs_kbd_timeouts = true,
  68	.kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
  69};
  70
  71static struct quirk_entry quirk_dell_xps13_9370 = {
  72	.kbd_missing_ac_tag = true,
  73};
  74
  75static struct quirk_entry quirk_dell_latitude_e6410 = {
  76	.kbd_led_levels_off_1 = true,
  77};
  78
  79static struct quirk_entry quirk_dell_inspiron_1012 = {
  80	.kbd_led_not_present = true,
  81};
  82
  83static struct quirk_entry quirk_dell_latitude_7520 = {
  84	.kbd_missing_ac_tag = true,
  85};
  86
  87static struct platform_driver platform_driver = {
  88	.driver = {
  89		.name = "dell-laptop",
  90	}
  91};
  92
  93static struct platform_device *platform_device;
  94static struct backlight_device *dell_backlight_device;
  95static struct rfkill *wifi_rfkill;
  96static struct rfkill *bluetooth_rfkill;
  97static struct rfkill *wwan_rfkill;
  98static bool force_rfkill;
  99static bool micmute_led_registered;
 
 100
 101module_param(force_rfkill, bool, 0444);
 102MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
 103
 104static const struct dmi_system_id dell_device_table[] __initconst = {
 105	{
 106		.ident = "Dell laptop",
 107		.matches = {
 108			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 109			DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 110		},
 111	},
 112	{
 113		.matches = {
 114			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 115			DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
 116		},
 117	},
 118	{
 119		.matches = {
 120			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 121			DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /*Notebook*/
 122		},
 123	},
 124	{
 125		.matches = {
 126			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 127			DMI_MATCH(DMI_CHASSIS_TYPE, "30"), /*Tablet*/
 128		},
 129	},
 130	{
 131		.matches = {
 132			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 133			DMI_MATCH(DMI_CHASSIS_TYPE, "31"), /*Convertible*/
 134		},
 135	},
 136	{
 137		.matches = {
 138			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 139			DMI_MATCH(DMI_CHASSIS_TYPE, "32"), /*Detachable*/
 140		},
 141	},
 142	{
 143		.ident = "Dell Computer Corporation",
 144		.matches = {
 145			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 146			DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 147		},
 148	},
 149	{ }
 150};
 151MODULE_DEVICE_TABLE(dmi, dell_device_table);
 152
 153static const struct dmi_system_id dell_quirks[] __initconst = {
 154	{
 155		.callback = dmi_matched,
 156		.ident = "Dell Vostro V130",
 157		.matches = {
 158			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 159			DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
 160		},
 161		.driver_data = &quirk_dell_vostro_v130,
 162	},
 163	{
 164		.callback = dmi_matched,
 165		.ident = "Dell Vostro V131",
 166		.matches = {
 167			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 168			DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 169		},
 170		.driver_data = &quirk_dell_vostro_v130,
 171	},
 172	{
 173		.callback = dmi_matched,
 174		.ident = "Dell Vostro 3350",
 175		.matches = {
 176			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 177			DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
 178		},
 179		.driver_data = &quirk_dell_vostro_v130,
 180	},
 181	{
 182		.callback = dmi_matched,
 183		.ident = "Dell Vostro 3555",
 184		.matches = {
 185			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 186			DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
 187		},
 188		.driver_data = &quirk_dell_vostro_v130,
 189	},
 190	{
 191		.callback = dmi_matched,
 192		.ident = "Dell Inspiron N311z",
 193		.matches = {
 194			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 195			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
 196		},
 197		.driver_data = &quirk_dell_vostro_v130,
 198	},
 199	{
 200		.callback = dmi_matched,
 201		.ident = "Dell Inspiron M5110",
 202		.matches = {
 203			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 204			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
 205		},
 206		.driver_data = &quirk_dell_vostro_v130,
 207	},
 208	{
 209		.callback = dmi_matched,
 210		.ident = "Dell Vostro 3360",
 211		.matches = {
 212			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 213			DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 214		},
 215		.driver_data = &quirk_dell_vostro_v130,
 216	},
 217	{
 218		.callback = dmi_matched,
 219		.ident = "Dell Vostro 3460",
 220		.matches = {
 221			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 222			DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
 223		},
 224		.driver_data = &quirk_dell_vostro_v130,
 225	},
 226	{
 227		.callback = dmi_matched,
 228		.ident = "Dell Vostro 3560",
 229		.matches = {
 230			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 231			DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
 232		},
 233		.driver_data = &quirk_dell_vostro_v130,
 234	},
 235	{
 236		.callback = dmi_matched,
 237		.ident = "Dell Vostro 3450",
 238		.matches = {
 239			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 240			DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
 241		},
 242		.driver_data = &quirk_dell_vostro_v130,
 243	},
 244	{
 245		.callback = dmi_matched,
 246		.ident = "Dell Inspiron 5420",
 247		.matches = {
 248			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 249			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
 250		},
 251		.driver_data = &quirk_dell_vostro_v130,
 252	},
 253	{
 254		.callback = dmi_matched,
 255		.ident = "Dell Inspiron 5520",
 256		.matches = {
 257			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 258			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
 259		},
 260		.driver_data = &quirk_dell_vostro_v130,
 261	},
 262	{
 263		.callback = dmi_matched,
 264		.ident = "Dell Inspiron 5720",
 265		.matches = {
 266			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 267			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
 268		},
 269		.driver_data = &quirk_dell_vostro_v130,
 270	},
 271	{
 272		.callback = dmi_matched,
 273		.ident = "Dell Inspiron 7420",
 274		.matches = {
 275			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 276			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
 277		},
 278		.driver_data = &quirk_dell_vostro_v130,
 279	},
 280	{
 281		.callback = dmi_matched,
 282		.ident = "Dell Inspiron 7520",
 283		.matches = {
 284			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 285			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 286		},
 287		.driver_data = &quirk_dell_vostro_v130,
 288	},
 289	{
 290		.callback = dmi_matched,
 291		.ident = "Dell Inspiron 7720",
 292		.matches = {
 293			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 294			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
 295		},
 296		.driver_data = &quirk_dell_vostro_v130,
 297	},
 298	{
 299		.callback = dmi_matched,
 300		.ident = "Dell XPS13 9333",
 301		.matches = {
 302			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 303			DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
 304		},
 305		.driver_data = &quirk_dell_xps13_9333,
 306	},
 307	{
 308		.callback = dmi_matched,
 309		.ident = "Dell XPS 13 9370",
 310		.matches = {
 311			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 312			DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9370"),
 313		},
 314		.driver_data = &quirk_dell_xps13_9370,
 315	},
 316	{
 317		.callback = dmi_matched,
 318		.ident = "Dell Latitude E6410",
 319		.matches = {
 320			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 321			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6410"),
 322		},
 323		.driver_data = &quirk_dell_latitude_e6410,
 324	},
 325	{
 326		.callback = dmi_matched,
 327		.ident = "Dell Inspiron 1012",
 328		.matches = {
 329			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 330			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
 331		},
 332		.driver_data = &quirk_dell_inspiron_1012,
 333	},
 334	{
 335		.callback = dmi_matched,
 336		.ident = "Dell Inspiron 1018",
 337		.matches = {
 338			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 339			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1018"),
 340		},
 341		.driver_data = &quirk_dell_inspiron_1012,
 342	},
 343	{
 344		.callback = dmi_matched,
 345		.ident = "Dell Latitude 7520",
 346		.matches = {
 347			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 348			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude 7520"),
 349		},
 350		.driver_data = &quirk_dell_latitude_7520,
 351	},
 352	{ }
 353};
 354
 355static void dell_fill_request(struct calling_interface_buffer *buffer,
 356			       u32 arg0, u32 arg1, u32 arg2, u32 arg3)
 357{
 358	memset(buffer, 0, sizeof(struct calling_interface_buffer));
 359	buffer->input[0] = arg0;
 360	buffer->input[1] = arg1;
 361	buffer->input[2] = arg2;
 362	buffer->input[3] = arg3;
 363}
 364
 365static int dell_send_request(struct calling_interface_buffer *buffer,
 366			     u16 class, u16 select)
 367{
 368	int ret;
 369
 370	buffer->cmd_class = class;
 371	buffer->cmd_select = select;
 372	ret = dell_smbios_call(buffer);
 373	if (ret != 0)
 374		return ret;
 375	return dell_smbios_error(buffer->output[0]);
 376}
 377
 378/*
 379 * Derived from information in smbios-wireless-ctl:
 380 *
 381 * cbSelect 17, Value 11
 382 *
 383 * Return Wireless Info
 384 * cbArg1, byte0 = 0x00
 385 *
 386 *     cbRes1 Standard return codes (0, -1, -2)
 387 *     cbRes2 Info bit flags:
 388 *
 389 *     0 Hardware switch supported (1)
 390 *     1 WiFi locator supported (1)
 391 *     2 WLAN supported (1)
 392 *     3 Bluetooth (BT) supported (1)
 393 *     4 WWAN supported (1)
 394 *     5 Wireless KBD supported (1)
 395 *     6 Uw b supported (1)
 396 *     7 WiGig supported (1)
 397 *     8 WLAN installed (1)
 398 *     9 BT installed (1)
 399 *     10 WWAN installed (1)
 400 *     11 Uw b installed (1)
 401 *     12 WiGig installed (1)
 402 *     13-15 Reserved (0)
 403 *     16 Hardware (HW) switch is On (1)
 404 *     17 WLAN disabled (1)
 405 *     18 BT disabled (1)
 406 *     19 WWAN disabled (1)
 407 *     20 Uw b disabled (1)
 408 *     21 WiGig disabled (1)
 409 *     20-31 Reserved (0)
 410 *
 411 *     cbRes3 NVRAM size in bytes
 412 *     cbRes4, byte 0 NVRAM format version number
 413 *
 414 *
 415 * Set QuickSet Radio Disable Flag
 416 *     cbArg1, byte0 = 0x01
 417 *     cbArg1, byte1
 418 *     Radio ID     value:
 419 *     0        Radio Status
 420 *     1        WLAN ID
 421 *     2        BT ID
 422 *     3        WWAN ID
 423 *     4        UWB ID
 424 *     5        WIGIG ID
 425 *     cbArg1, byte2    Flag bits:
 426 *             0 QuickSet disables radio (1)
 427 *             1-7 Reserved (0)
 428 *
 429 *     cbRes1    Standard return codes (0, -1, -2)
 430 *     cbRes2    QuickSet (QS) radio disable bit map:
 431 *     0 QS disables WLAN
 432 *     1 QS disables BT
 433 *     2 QS disables WWAN
 434 *     3 QS disables UWB
 435 *     4 QS disables WIGIG
 436 *     5-31 Reserved (0)
 437 *
 438 * Wireless Switch Configuration
 439 *     cbArg1, byte0 = 0x02
 440 *
 441 *     cbArg1, byte1
 442 *     Subcommand:
 443 *     0 Get config
 444 *     1 Set config
 445 *     2 Set WiFi locator enable/disable
 446 *     cbArg1,byte2
 447 *     Switch settings (if byte 1==1):
 448 *     0 WLAN sw itch control (1)
 449 *     1 BT sw itch control (1)
 450 *     2 WWAN sw itch control (1)
 451 *     3 UWB sw itch control (1)
 452 *     4 WiGig sw itch control (1)
 453 *     5-7 Reserved (0)
 454 *    cbArg1, byte2 Enable bits (if byte 1==2):
 455 *     0 Enable WiFi locator (1)
 456 *
 457 *    cbRes1     Standard return codes (0, -1, -2)
 458 *    cbRes2 QuickSet radio disable bit map:
 459 *     0 WLAN controlled by sw itch (1)
 460 *     1 BT controlled by sw itch (1)
 461 *     2 WWAN controlled by sw itch (1)
 462 *     3 UWB controlled by sw itch (1)
 463 *     4 WiGig controlled by sw itch (1)
 464 *     5-6 Reserved (0)
 465 *     7 Wireless sw itch config locked (1)
 466 *     8 WiFi locator enabled (1)
 467 *     9-14 Reserved (0)
 468 *     15 WiFi locator setting locked (1)
 469 *     16-31 Reserved (0)
 470 *
 471 * Read Local Config Data (LCD)
 472 *     cbArg1, byte0 = 0x10
 473 *     cbArg1, byte1 NVRAM index low byte
 474 *     cbArg1, byte2 NVRAM index high byte
 475 *     cbRes1 Standard return codes (0, -1, -2)
 476 *     cbRes2 4 bytes read from LCD[index]
 477 *     cbRes3 4 bytes read from LCD[index+4]
 478 *     cbRes4 4 bytes read from LCD[index+8]
 479 *
 480 * Write Local Config Data (LCD)
 481 *     cbArg1, byte0 = 0x11
 482 *     cbArg1, byte1 NVRAM index low byte
 483 *     cbArg1, byte2 NVRAM index high byte
 484 *     cbArg2 4 bytes to w rite at LCD[index]
 485 *     cbArg3 4 bytes to w rite at LCD[index+4]
 486 *     cbArg4 4 bytes to w rite at LCD[index+8]
 487 *     cbRes1 Standard return codes (0, -1, -2)
 488 *
 489 * Populate Local Config Data from NVRAM
 490 *     cbArg1, byte0 = 0x12
 491 *     cbRes1 Standard return codes (0, -1, -2)
 492 *
 493 * Commit Local Config Data to NVRAM
 494 *     cbArg1, byte0 = 0x13
 495 *     cbRes1 Standard return codes (0, -1, -2)
 496 */
 497
 498static int dell_rfkill_set(void *data, bool blocked)
 499{
 500	int disable = blocked ? 1 : 0;
 501	unsigned long radio = (unsigned long)data;
 502	int hwswitch_bit = (unsigned long)data - 1;
 503	struct calling_interface_buffer buffer;
 504	int hwswitch;
 505	int status;
 506	int ret;
 507
 508	dell_fill_request(&buffer, 0, 0, 0, 0);
 509	ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 510	if (ret)
 511		return ret;
 512	status = buffer.output[1];
 513
 514	dell_fill_request(&buffer, 0x2, 0, 0, 0);
 515	ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 516	if (ret)
 517		return ret;
 518	hwswitch = buffer.output[1];
 519
 520	/* If the hardware switch controls this radio, and the hardware
 521	   switch is disabled, always disable the radio */
 522	if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
 523	    (status & BIT(0)) && !(status & BIT(16)))
 524		disable = 1;
 525
 526	dell_fill_request(&buffer, 1 | (radio<<8) | (disable << 16), 0, 0, 0);
 527	ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 528	return ret;
 529}
 530
 531static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 532					int status)
 533{
 534	if (status & BIT(0)) {
 535		/* Has hw-switch, sync sw_state to BIOS */
 536		struct calling_interface_buffer buffer;
 537		int block = rfkill_blocked(rfkill);
 538		dell_fill_request(&buffer,
 539				   1 | (radio << 8) | (block << 16), 0, 0, 0);
 540		dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 541	} else {
 542		/* No hw-switch, sync BIOS state to sw_state */
 543		rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 544	}
 545}
 546
 547static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
 548					int status, int hwswitch)
 549{
 550	if (hwswitch & (BIT(radio - 1)))
 551		rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 552}
 553
 554static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 555{
 556	int radio = ((unsigned long)data & 0xF);
 557	struct calling_interface_buffer buffer;
 558	int hwswitch;
 559	int status;
 560	int ret;
 561
 562	dell_fill_request(&buffer, 0, 0, 0, 0);
 563	ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 564	status = buffer.output[1];
 565
 566	if (ret != 0 || !(status & BIT(0))) {
 567		return;
 568	}
 569
 570	dell_fill_request(&buffer, 0x2, 0, 0, 0);
 571	ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 572	hwswitch = buffer.output[1];
 573
 574	if (ret != 0)
 575		return;
 576
 577	dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
 578}
 579
 580static const struct rfkill_ops dell_rfkill_ops = {
 581	.set_block = dell_rfkill_set,
 582	.query = dell_rfkill_query,
 583};
 584
 585static struct dentry *dell_laptop_dir;
 586
 587static int dell_debugfs_show(struct seq_file *s, void *data)
 588{
 589	struct calling_interface_buffer buffer;
 590	int hwswitch_state;
 591	int hwswitch_ret;
 592	int status;
 593	int ret;
 594
 595	dell_fill_request(&buffer, 0, 0, 0, 0);
 596	ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 597	if (ret)
 598		return ret;
 599	status = buffer.output[1];
 600
 601	dell_fill_request(&buffer, 0x2, 0, 0, 0);
 602	hwswitch_ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 603	if (hwswitch_ret)
 604		return hwswitch_ret;
 605	hwswitch_state = buffer.output[1];
 606
 607	seq_printf(s, "return:\t%d\n", ret);
 608	seq_printf(s, "status:\t0x%X\n", status);
 609	seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
 610		   status & BIT(0));
 611	seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
 612		  (status & BIT(1)) >> 1);
 613	seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
 614		  (status & BIT(2)) >> 2);
 615	seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
 616		  (status & BIT(3)) >> 3);
 617	seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
 618		  (status & BIT(4)) >> 4);
 619	seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
 620		  (status & BIT(5)) >> 5);
 621	seq_printf(s, "Bit 6 : UWB supported:               %lu\n",
 622		  (status & BIT(6)) >> 6);
 623	seq_printf(s, "Bit 7 : WiGig supported:             %lu\n",
 624		  (status & BIT(7)) >> 7);
 625	seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
 626		  (status & BIT(8)) >> 8);
 627	seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
 628		  (status & BIT(9)) >> 9);
 629	seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
 630		  (status & BIT(10)) >> 10);
 631	seq_printf(s, "Bit 11: UWB installed:               %lu\n",
 632		  (status & BIT(11)) >> 11);
 633	seq_printf(s, "Bit 12: WiGig installed:             %lu\n",
 634		  (status & BIT(12)) >> 12);
 635
 636	seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
 637		  (status & BIT(16)) >> 16);
 638	seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
 639		  (status & BIT(17)) >> 17);
 640	seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
 641		  (status & BIT(18)) >> 18);
 642	seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
 643		  (status & BIT(19)) >> 19);
 644	seq_printf(s, "Bit 20: UWB is blocked:              %lu\n",
 645		  (status & BIT(20)) >> 20);
 646	seq_printf(s, "Bit 21: WiGig is blocked:            %lu\n",
 647		  (status & BIT(21)) >> 21);
 648
 649	seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
 650	seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
 651	seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
 652		   hwswitch_state & BIT(0));
 653	seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
 654		   (hwswitch_state & BIT(1)) >> 1);
 655	seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
 656		   (hwswitch_state & BIT(2)) >> 2);
 657	seq_printf(s, "Bit 3 : UWB controlled by switch:       %lu\n",
 658		   (hwswitch_state & BIT(3)) >> 3);
 659	seq_printf(s, "Bit 4 : WiGig controlled by switch:     %lu\n",
 660		   (hwswitch_state & BIT(4)) >> 4);
 661	seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
 662		   (hwswitch_state & BIT(7)) >> 7);
 663	seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
 664		   (hwswitch_state & BIT(8)) >> 8);
 665	seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
 666		   (hwswitch_state & BIT(15)) >> 15);
 667
 668	return 0;
 669}
 670DEFINE_SHOW_ATTRIBUTE(dell_debugfs);
 671
 672static void dell_update_rfkill(struct work_struct *ignored)
 673{
 674	struct calling_interface_buffer buffer;
 675	int hwswitch = 0;
 676	int status;
 677	int ret;
 678
 679	dell_fill_request(&buffer, 0, 0, 0, 0);
 680	ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 681	status = buffer.output[1];
 682
 683	if (ret != 0)
 684		return;
 685
 686	dell_fill_request(&buffer, 0x2, 0, 0, 0);
 687	ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 688
 689	if (ret == 0 && (status & BIT(0)))
 690		hwswitch = buffer.output[1];
 691
 692	if (wifi_rfkill) {
 693		dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
 694		dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
 695	}
 696	if (bluetooth_rfkill) {
 697		dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
 698					    hwswitch);
 699		dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
 700	}
 701	if (wwan_rfkill) {
 702		dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
 703		dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 704	}
 705}
 706static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 707
 708static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 709			      struct serio *port)
 710{
 711	static bool extended;
 712
 713	if (str & I8042_STR_AUXDATA)
 714		return false;
 715
 716	if (unlikely(data == 0xe0)) {
 717		extended = true;
 718		return false;
 719	} else if (unlikely(extended)) {
 720		switch (data) {
 721		case 0x8:
 722			schedule_delayed_work(&dell_rfkill_work,
 723					      round_jiffies_relative(HZ / 4));
 724			break;
 725		}
 726		extended = false;
 727	}
 728
 729	return false;
 730}
 731
 732static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
 733static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
 734
 735static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
 736					  unsigned long action, void *data)
 737{
 738	schedule_delayed_work(&dell_rfkill_work, 0);
 739	return NOTIFY_OK;
 740}
 741
 742static struct notifier_block dell_laptop_rbtn_notifier = {
 743	.notifier_call = dell_laptop_rbtn_notifier_call,
 744};
 745
 746static int __init dell_setup_rfkill(void)
 747{
 748	struct calling_interface_buffer buffer;
 749	int status, ret, whitelisted;
 750	const char *product;
 751
 752	/*
 753	 * rfkill support causes trouble on various models, mostly Inspirons.
 754	 * So we whitelist certain series, and don't support rfkill on others.
 755	 */
 756	whitelisted = 0;
 757	product = dmi_get_system_info(DMI_PRODUCT_NAME);
 758	if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
 759			 strncmp(product, "Precision", 9) == 0))
 760		whitelisted = 1;
 761	if (!force_rfkill && !whitelisted)
 762		return 0;
 763
 764	dell_fill_request(&buffer, 0, 0, 0, 0);
 765	ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
 766	status = buffer.output[1];
 767
 768	/* dell wireless info smbios call is not supported */
 769	if (ret != 0)
 770		return 0;
 771
 772	/* rfkill is only tested on laptops with a hwswitch */
 773	if (!(status & BIT(0)) && !force_rfkill)
 774		return 0;
 775
 776	if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 777		wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 778					   RFKILL_TYPE_WLAN,
 779					   &dell_rfkill_ops, (void *) 1);
 780		if (!wifi_rfkill) {
 781			ret = -ENOMEM;
 782			goto err_wifi;
 783		}
 784		ret = rfkill_register(wifi_rfkill);
 785		if (ret)
 786			goto err_wifi;
 787	}
 788
 789	if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 790		bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 791						&platform_device->dev,
 792						RFKILL_TYPE_BLUETOOTH,
 793						&dell_rfkill_ops, (void *) 2);
 794		if (!bluetooth_rfkill) {
 795			ret = -ENOMEM;
 796			goto err_bluetooth;
 797		}
 798		ret = rfkill_register(bluetooth_rfkill);
 799		if (ret)
 800			goto err_bluetooth;
 801	}
 802
 803	if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 804		wwan_rfkill = rfkill_alloc("dell-wwan",
 805					   &platform_device->dev,
 806					   RFKILL_TYPE_WWAN,
 807					   &dell_rfkill_ops, (void *) 3);
 808		if (!wwan_rfkill) {
 809			ret = -ENOMEM;
 810			goto err_wwan;
 811		}
 812		ret = rfkill_register(wwan_rfkill);
 813		if (ret)
 814			goto err_wwan;
 815	}
 816
 817	/*
 818	 * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
 819	 * which can receive events from HW slider switch.
 820	 *
 821	 * Dell SMBIOS on whitelisted models supports controlling radio devices
 822	 * but does not support receiving HW button switch events. We can use
 823	 * i8042 filter hook function to receive keyboard data and handle
 824	 * keycode for HW button.
 825	 *
 826	 * So if it is possible we will use Dell Airplane Mode Switch ACPI
 827	 * driver for receiving HW events and Dell SMBIOS for setting rfkill
 828	 * states. If ACPI driver or device is not available we will fallback to
 829	 * i8042 filter hook function.
 830	 *
 831	 * To prevent duplicate rfkill devices which control and do same thing,
 832	 * dell-rbtn driver will automatically remove its own rfkill devices
 833	 * once function dell_rbtn_notifier_register() is called.
 834	 */
 835
 836	dell_rbtn_notifier_register_func =
 837		symbol_request(dell_rbtn_notifier_register);
 838	if (dell_rbtn_notifier_register_func) {
 839		dell_rbtn_notifier_unregister_func =
 840			symbol_request(dell_rbtn_notifier_unregister);
 841		if (!dell_rbtn_notifier_unregister_func) {
 842			symbol_put(dell_rbtn_notifier_register);
 843			dell_rbtn_notifier_register_func = NULL;
 844		}
 845	}
 846
 847	if (dell_rbtn_notifier_register_func) {
 848		ret = dell_rbtn_notifier_register_func(
 849			&dell_laptop_rbtn_notifier);
 850		symbol_put(dell_rbtn_notifier_register);
 851		dell_rbtn_notifier_register_func = NULL;
 852		if (ret != 0) {
 853			symbol_put(dell_rbtn_notifier_unregister);
 854			dell_rbtn_notifier_unregister_func = NULL;
 855		}
 856	} else {
 857		pr_info("Symbols from dell-rbtn acpi driver are not available\n");
 858		ret = -ENODEV;
 859	}
 860
 861	if (ret == 0) {
 862		pr_info("Using dell-rbtn acpi driver for receiving events\n");
 863	} else if (ret != -ENODEV) {
 864		pr_warn("Unable to register dell rbtn notifier\n");
 865		goto err_filter;
 866	} else {
 867		ret = i8042_install_filter(dell_laptop_i8042_filter);
 868		if (ret) {
 869			pr_warn("Unable to install key filter\n");
 870			goto err_filter;
 871		}
 872		pr_info("Using i8042 filter function for receiving events\n");
 873	}
 874
 875	return 0;
 876err_filter:
 877	if (wwan_rfkill)
 878		rfkill_unregister(wwan_rfkill);
 879err_wwan:
 880	rfkill_destroy(wwan_rfkill);
 881	if (bluetooth_rfkill)
 882		rfkill_unregister(bluetooth_rfkill);
 883err_bluetooth:
 884	rfkill_destroy(bluetooth_rfkill);
 885	if (wifi_rfkill)
 886		rfkill_unregister(wifi_rfkill);
 887err_wifi:
 888	rfkill_destroy(wifi_rfkill);
 889
 890	return ret;
 891}
 892
 893static void dell_cleanup_rfkill(void)
 894{
 895	if (dell_rbtn_notifier_unregister_func) {
 896		dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
 897		symbol_put(dell_rbtn_notifier_unregister);
 898		dell_rbtn_notifier_unregister_func = NULL;
 899	} else {
 900		i8042_remove_filter(dell_laptop_i8042_filter);
 901	}
 902	cancel_delayed_work_sync(&dell_rfkill_work);
 903	if (wifi_rfkill) {
 904		rfkill_unregister(wifi_rfkill);
 905		rfkill_destroy(wifi_rfkill);
 906	}
 907	if (bluetooth_rfkill) {
 908		rfkill_unregister(bluetooth_rfkill);
 909		rfkill_destroy(bluetooth_rfkill);
 910	}
 911	if (wwan_rfkill) {
 912		rfkill_unregister(wwan_rfkill);
 913		rfkill_destroy(wwan_rfkill);
 914	}
 915}
 916
 917static int dell_send_intensity(struct backlight_device *bd)
 918{
 919	struct calling_interface_buffer buffer;
 920	struct calling_interface_token *token;
 921	int ret;
 922
 923	token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 924	if (!token)
 925		return -ENODEV;
 926
 927	dell_fill_request(&buffer,
 928			   token->location, bd->props.brightness, 0, 0);
 929	if (power_supply_is_system_supplied() > 0)
 930		ret = dell_send_request(&buffer,
 931					CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
 932	else
 933		ret = dell_send_request(&buffer,
 934					CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
 935
 936	return ret;
 937}
 938
 939static int dell_get_intensity(struct backlight_device *bd)
 940{
 941	struct calling_interface_buffer buffer;
 942	struct calling_interface_token *token;
 943	int ret;
 944
 945	token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
 946	if (!token)
 947		return -ENODEV;
 948
 949	dell_fill_request(&buffer, token->location, 0, 0, 0);
 950	if (power_supply_is_system_supplied() > 0)
 951		ret = dell_send_request(&buffer,
 952					CLASS_TOKEN_READ, SELECT_TOKEN_AC);
 953	else
 954		ret = dell_send_request(&buffer,
 955					CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
 956
 957	if (ret == 0)
 958		ret = buffer.output[1];
 959
 960	return ret;
 961}
 962
 963static const struct backlight_ops dell_ops = {
 964	.get_brightness = dell_get_intensity,
 965	.update_status  = dell_send_intensity,
 966};
 967
 968static void touchpad_led_on(void)
 969{
 970	int command = 0x97;
 971	char data = 1;
 972	i8042_command(&data, command | 1 << 12);
 973}
 974
 975static void touchpad_led_off(void)
 976{
 977	int command = 0x97;
 978	char data = 2;
 979	i8042_command(&data, command | 1 << 12);
 980}
 981
 982static void touchpad_led_set(struct led_classdev *led_cdev,
 983	enum led_brightness value)
 984{
 985	if (value > 0)
 986		touchpad_led_on();
 987	else
 988		touchpad_led_off();
 989}
 990
 991static struct led_classdev touchpad_led = {
 992	.name = "dell-laptop::touchpad",
 993	.brightness_set = touchpad_led_set,
 994	.flags = LED_CORE_SUSPENDRESUME,
 995};
 996
 997static int __init touchpad_led_init(struct device *dev)
 998{
 999	return led_classdev_register(dev, &touchpad_led);
1000}
1001
1002static void touchpad_led_exit(void)
1003{
1004	led_classdev_unregister(&touchpad_led);
1005}
1006
1007/*
1008 * Derived from information in smbios-keyboard-ctl:
1009 *
1010 * cbClass 4
1011 * cbSelect 11
1012 * Keyboard illumination
1013 * cbArg1 determines the function to be performed
1014 *
1015 * cbArg1 0x0 = Get Feature Information
1016 *  cbRES1         Standard return codes (0, -1, -2)
1017 *  cbRES2, word0  Bitmap of user-selectable modes
1018 *     bit 0     Always off (All systems)
1019 *     bit 1     Always on (Travis ATG, Siberia)
1020 *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1021 *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1022 *     bit 4     Auto: Input-activity-based On; input-activity based Off
1023 *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1024 *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1025 *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1026 *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1027 *     bits 9-15 Reserved for future use
1028 *  cbRES2, byte2  Reserved for future use
1029 *  cbRES2, byte3  Keyboard illumination type
1030 *     0         Reserved
1031 *     1         Tasklight
1032 *     2         Backlight
1033 *     3-255     Reserved for future use
1034 *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
1035 *     bit 0     Any keystroke
1036 *     bit 1     Touchpad activity
1037 *     bit 2     Pointing stick
1038 *     bit 3     Any mouse
1039 *     bits 4-7  Reserved for future use
1040 *  cbRES3, byte1  Supported timeout unit bitmap
1041 *     bit 0     Seconds
1042 *     bit 1     Minutes
1043 *     bit 2     Hours
1044 *     bit 3     Days
1045 *     bits 4-7  Reserved for future use
1046 *  cbRES3, byte2  Number of keyboard light brightness levels
1047 *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
1048 *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
1049 *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
1050 *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
1051 *
1052 * cbArg1 0x1 = Get Current State
1053 *  cbRES1         Standard return codes (0, -1, -2)
1054 *  cbRES2, word0  Bitmap of current mode state
1055 *     bit 0     Always off (All systems)
1056 *     bit 1     Always on (Travis ATG, Siberia)
1057 *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1058 *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1059 *     bit 4     Auto: Input-activity-based On; input-activity based Off
1060 *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1061 *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1062 *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1063 *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1064 *     bits 9-15 Reserved for future use
1065 *     Note: Only One bit can be set
1066 *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
1067 *     bit 0     Any keystroke
1068 *     bit 1     Touchpad activity
1069 *     bit 2     Pointing stick
1070 *     bit 3     Any mouse
1071 *     bits 4-7  Reserved for future use
1072 *  cbRES2, byte3  Current Timeout on battery
1073 *     bits 7:6  Timeout units indicator:
1074 *     00b       Seconds
1075 *     01b       Minutes
1076 *     10b       Hours
1077 *     11b       Days
1078 *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1079 *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
1080 *     are set upon return from the [Get feature information] call.
1081 *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
1082 *  cbRES3, byte1  Current ALS reading
1083 *  cbRES3, byte2  Current keyboard light level.
1084 *  cbRES3, byte3  Current timeout on AC Power
1085 *     bits 7:6  Timeout units indicator:
1086 *     00b       Seconds
1087 *     01b       Minutes
1088 *     10b       Hours
1089 *     11b       Days
1090 *     Bits 5:0  Timeout value (0-63) in sec/min/hr/day
1091 *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte2
1092 *     are set upon return from the upon return from the [Get Feature information] call.
1093 *
1094 * cbArg1 0x2 = Set New State
1095 *  cbRES1         Standard return codes (0, -1, -2)
1096 *  cbArg2, word0  Bitmap of current mode state
1097 *     bit 0     Always off (All systems)
1098 *     bit 1     Always on (Travis ATG, Siberia)
1099 *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
1100 *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
1101 *     bit 4     Auto: Input-activity-based On; input-activity based Off
1102 *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1103 *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1104 *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1105 *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1106 *     bits 9-15 Reserved for future use
1107 *     Note: Only One bit can be set
1108 *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
1109 *                 keyboard to turn off automatically.
1110 *     bit 0     Any keystroke
1111 *     bit 1     Touchpad activity
1112 *     bit 2     Pointing stick
1113 *     bit 3     Any mouse
1114 *     bits 4-7  Reserved for future use
1115 *  cbArg2, byte3  Desired Timeout on battery
1116 *     bits 7:6  Timeout units indicator:
1117 *     00b       Seconds
1118 *     01b       Minutes
1119 *     10b       Hours
1120 *     11b       Days
1121 *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1122 *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
1123 *  cbArg3, byte2  Desired keyboard light level.
1124 *  cbArg3, byte3  Desired Timeout on AC power
1125 *     bits 7:6  Timeout units indicator:
1126 *     00b       Seconds
1127 *     01b       Minutes
1128 *     10b       Hours
1129 *     11b       Days
1130 *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
1131 */
1132
1133
1134enum kbd_timeout_unit {
1135	KBD_TIMEOUT_SECONDS = 0,
1136	KBD_TIMEOUT_MINUTES,
1137	KBD_TIMEOUT_HOURS,
1138	KBD_TIMEOUT_DAYS,
1139};
1140
1141enum kbd_mode_bit {
1142	KBD_MODE_BIT_OFF = 0,
1143	KBD_MODE_BIT_ON,
1144	KBD_MODE_BIT_ALS,
1145	KBD_MODE_BIT_TRIGGER_ALS,
1146	KBD_MODE_BIT_TRIGGER,
1147	KBD_MODE_BIT_TRIGGER_25,
1148	KBD_MODE_BIT_TRIGGER_50,
1149	KBD_MODE_BIT_TRIGGER_75,
1150	KBD_MODE_BIT_TRIGGER_100,
1151};
1152
1153#define kbd_is_als_mode_bit(bit) \
1154	((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
1155#define kbd_is_trigger_mode_bit(bit) \
1156	((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1157#define kbd_is_level_mode_bit(bit) \
1158	((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1159
1160struct kbd_info {
1161	u16 modes;
1162	u8 type;
1163	u8 triggers;
1164	u8 levels;
1165	u8 seconds;
1166	u8 minutes;
1167	u8 hours;
1168	u8 days;
1169};
1170
1171struct kbd_state {
1172	u8 mode_bit;
1173	u8 triggers;
1174	u8 timeout_value;
1175	u8 timeout_unit;
1176	u8 timeout_value_ac;
1177	u8 timeout_unit_ac;
1178	u8 als_setting;
1179	u8 als_value;
1180	u8 level;
1181};
1182
1183static const int kbd_tokens[] = {
1184	KBD_LED_OFF_TOKEN,
1185	KBD_LED_AUTO_25_TOKEN,
1186	KBD_LED_AUTO_50_TOKEN,
1187	KBD_LED_AUTO_75_TOKEN,
1188	KBD_LED_AUTO_100_TOKEN,
1189	KBD_LED_ON_TOKEN,
1190};
1191
1192static u16 kbd_token_bits;
1193
1194static struct kbd_info kbd_info;
1195static bool kbd_als_supported;
1196static bool kbd_triggers_supported;
1197static bool kbd_timeout_ac_supported;
1198
1199static u8 kbd_mode_levels[16];
1200static int kbd_mode_levels_count;
1201
1202static u8 kbd_previous_level;
1203static u8 kbd_previous_mode_bit;
1204
1205static bool kbd_led_present;
1206static DEFINE_MUTEX(kbd_led_mutex);
1207static enum led_brightness kbd_led_level;
1208
1209/*
1210 * NOTE: there are three ways to set the keyboard backlight level.
1211 * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1212 * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1213 * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1214 *
1215 * There are laptops which support only one of these methods. If we want to
1216 * support as many machines as possible we need to implement all three methods.
1217 * The first two methods use the kbd_state structure. The third uses SMBIOS
1218 * tokens. If kbd_info.levels == 0, the machine does not support setting the
1219 * keyboard backlight level via kbd_state.level.
1220 */
1221
1222static int kbd_get_info(struct kbd_info *info)
1223{
1224	struct calling_interface_buffer buffer;
1225	u8 units;
1226	int ret;
1227
1228	dell_fill_request(&buffer, 0, 0, 0, 0);
1229	ret = dell_send_request(&buffer,
1230				CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1231	if (ret)
1232		return ret;
1233
1234	info->modes = buffer.output[1] & 0xFFFF;
1235	info->type = (buffer.output[1] >> 24) & 0xFF;
1236	info->triggers = buffer.output[2] & 0xFF;
1237	units = (buffer.output[2] >> 8) & 0xFF;
1238	info->levels = (buffer.output[2] >> 16) & 0xFF;
1239
1240	if (quirks && quirks->kbd_led_levels_off_1 && info->levels)
1241		info->levels--;
1242
1243	if (units & BIT(0))
1244		info->seconds = (buffer.output[3] >> 0) & 0xFF;
1245	if (units & BIT(1))
1246		info->minutes = (buffer.output[3] >> 8) & 0xFF;
1247	if (units & BIT(2))
1248		info->hours = (buffer.output[3] >> 16) & 0xFF;
1249	if (units & BIT(3))
1250		info->days = (buffer.output[3] >> 24) & 0xFF;
1251
1252	return ret;
1253}
1254
1255static unsigned int kbd_get_max_level(void)
1256{
1257	if (kbd_info.levels != 0)
1258		return kbd_info.levels;
1259	if (kbd_mode_levels_count > 0)
1260		return kbd_mode_levels_count - 1;
1261	return 0;
1262}
1263
1264static int kbd_get_level(struct kbd_state *state)
1265{
1266	int i;
1267
1268	if (kbd_info.levels != 0)
1269		return state->level;
1270
1271	if (kbd_mode_levels_count > 0) {
1272		for (i = 0; i < kbd_mode_levels_count; ++i)
1273			if (kbd_mode_levels[i] == state->mode_bit)
1274				return i;
1275		return 0;
1276	}
1277
1278	return -EINVAL;
1279}
1280
1281static int kbd_set_level(struct kbd_state *state, u8 level)
1282{
1283	if (kbd_info.levels != 0) {
1284		if (level != 0)
1285			kbd_previous_level = level;
1286		if (state->level == level)
1287			return 0;
1288		state->level = level;
1289		if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1290			state->mode_bit = kbd_previous_mode_bit;
1291		else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1292			kbd_previous_mode_bit = state->mode_bit;
1293			state->mode_bit = KBD_MODE_BIT_OFF;
1294		}
1295		return 0;
1296	}
1297
1298	if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1299		if (level != 0)
1300			kbd_previous_level = level;
1301		state->mode_bit = kbd_mode_levels[level];
1302		return 0;
1303	}
1304
1305	return -EINVAL;
1306}
1307
1308static int kbd_get_state(struct kbd_state *state)
1309{
1310	struct calling_interface_buffer buffer;
1311	int ret;
1312
1313	dell_fill_request(&buffer, 0x1, 0, 0, 0);
1314	ret = dell_send_request(&buffer,
1315				CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1316	if (ret)
1317		return ret;
1318
1319	state->mode_bit = ffs(buffer.output[1] & 0xFFFF);
1320	if (state->mode_bit != 0)
1321		state->mode_bit--;
1322
1323	state->triggers = (buffer.output[1] >> 16) & 0xFF;
1324	state->timeout_value = (buffer.output[1] >> 24) & 0x3F;
1325	state->timeout_unit = (buffer.output[1] >> 30) & 0x3;
1326	state->als_setting = buffer.output[2] & 0xFF;
1327	state->als_value = (buffer.output[2] >> 8) & 0xFF;
1328	state->level = (buffer.output[2] >> 16) & 0xFF;
1329	state->timeout_value_ac = (buffer.output[2] >> 24) & 0x3F;
1330	state->timeout_unit_ac = (buffer.output[2] >> 30) & 0x3;
1331
1332	return ret;
1333}
1334
1335static int kbd_set_state(struct kbd_state *state)
1336{
1337	struct calling_interface_buffer buffer;
1338	int ret;
1339	u32 input1;
1340	u32 input2;
1341
1342	input1 = BIT(state->mode_bit) & 0xFFFF;
1343	input1 |= (state->triggers & 0xFF) << 16;
1344	input1 |= (state->timeout_value & 0x3F) << 24;
1345	input1 |= (state->timeout_unit & 0x3) << 30;
1346	input2 = state->als_setting & 0xFF;
1347	input2 |= (state->level & 0xFF) << 16;
1348	input2 |= (state->timeout_value_ac & 0x3F) << 24;
1349	input2 |= (state->timeout_unit_ac & 0x3) << 30;
1350	dell_fill_request(&buffer, 0x2, input1, input2, 0);
1351	ret = dell_send_request(&buffer,
1352				CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
1353
1354	return ret;
1355}
1356
1357static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1358{
1359	int ret;
1360
1361	ret = kbd_set_state(state);
1362	if (ret == 0)
1363		return 0;
1364
1365	/*
1366	 * When setting the new state fails,try to restore the previous one.
1367	 * This is needed on some machines where BIOS sets a default state when
1368	 * setting a new state fails. This default state could be all off.
1369	 */
1370
1371	if (kbd_set_state(old))
1372		pr_err("Setting old previous keyboard state failed\n");
1373
1374	return ret;
1375}
1376
1377static int kbd_set_token_bit(u8 bit)
1378{
1379	struct calling_interface_buffer buffer;
1380	struct calling_interface_token *token;
1381	int ret;
1382
1383	if (bit >= ARRAY_SIZE(kbd_tokens))
1384		return -EINVAL;
1385
1386	token = dell_smbios_find_token(kbd_tokens[bit]);
1387	if (!token)
1388		return -EINVAL;
1389
1390	dell_fill_request(&buffer, token->location, token->value, 0, 0);
1391	ret = dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
1392
1393	return ret;
1394}
1395
1396static int kbd_get_token_bit(u8 bit)
1397{
1398	struct calling_interface_buffer buffer;
1399	struct calling_interface_token *token;
1400	int ret;
1401	int val;
1402
1403	if (bit >= ARRAY_SIZE(kbd_tokens))
1404		return -EINVAL;
1405
1406	token = dell_smbios_find_token(kbd_tokens[bit]);
1407	if (!token)
1408		return -EINVAL;
1409
1410	dell_fill_request(&buffer, token->location, 0, 0, 0);
1411	ret = dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD);
1412	val = buffer.output[1];
1413
1414	if (ret)
1415		return ret;
1416
1417	return (val == token->value);
1418}
1419
1420static int kbd_get_first_active_token_bit(void)
1421{
1422	int i;
1423	int ret;
1424
1425	for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1426		ret = kbd_get_token_bit(i);
1427		if (ret == 1)
1428			return i;
1429	}
1430
1431	return ret;
1432}
1433
1434static int kbd_get_valid_token_counts(void)
1435{
1436	return hweight16(kbd_token_bits);
1437}
1438
1439static inline int kbd_init_info(void)
1440{
1441	struct kbd_state state;
1442	int ret;
1443	int i;
1444
1445	ret = kbd_get_info(&kbd_info);
1446	if (ret)
1447		return ret;
1448
1449	/* NOTE: Old models without KBD_LED_AC_TOKEN token supports only one
1450	 *       timeout value which is shared for both battery and AC power
1451	 *       settings. So do not try to set AC values on old models.
1452	 */
1453	if ((quirks && quirks->kbd_missing_ac_tag) ||
1454	    dell_smbios_find_token(KBD_LED_AC_TOKEN))
1455		kbd_timeout_ac_supported = true;
1456
1457	kbd_get_state(&state);
1458
1459	/* NOTE: timeout value is stored in 6 bits so max value is 63 */
1460	if (kbd_info.seconds > 63)
1461		kbd_info.seconds = 63;
1462	if (kbd_info.minutes > 63)
1463		kbd_info.minutes = 63;
1464	if (kbd_info.hours > 63)
1465		kbd_info.hours = 63;
1466	if (kbd_info.days > 63)
1467		kbd_info.days = 63;
1468
1469	/* NOTE: On tested machines ON mode did not work and caused
1470	 *       problems (turned backlight off) so do not use it
1471	 */
1472	kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1473
1474	kbd_previous_level = kbd_get_level(&state);
1475	kbd_previous_mode_bit = state.mode_bit;
1476
1477	if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1478		kbd_previous_level = 1;
1479
1480	if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1481		kbd_previous_mode_bit =
1482			ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1483		if (kbd_previous_mode_bit != 0)
1484			kbd_previous_mode_bit--;
1485	}
1486
1487	if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1488			      BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1489		kbd_als_supported = true;
1490
1491	if (kbd_info.modes & (
1492	    BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1493	    BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1494	    BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1495	   ))
1496		kbd_triggers_supported = true;
1497
1498	/* kbd_mode_levels[0] is reserved, see below */
1499	for (i = 0; i < 16; ++i)
1500		if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1501			kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1502
1503	/*
1504	 * Find the first supported mode and assign to kbd_mode_levels[0].
1505	 * This should be 0 (off), but we cannot depend on the BIOS to
1506	 * support 0.
1507	 */
1508	if (kbd_mode_levels_count > 0) {
1509		for (i = 0; i < 16; ++i) {
1510			if (BIT(i) & kbd_info.modes) {
1511				kbd_mode_levels[0] = i;
1512				break;
1513			}
1514		}
1515		kbd_mode_levels_count++;
1516	}
1517
1518	return 0;
1519
1520}
1521
1522static inline void kbd_init_tokens(void)
1523{
1524	int i;
1525
1526	for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1527		if (dell_smbios_find_token(kbd_tokens[i]))
1528			kbd_token_bits |= BIT(i);
1529}
1530
1531static void kbd_init(void)
1532{
1533	int ret;
1534
1535	if (quirks && quirks->kbd_led_not_present)
1536		return;
1537
1538	ret = kbd_init_info();
1539	kbd_init_tokens();
1540
1541	/*
1542	 * Only supports keyboard backlight when it has at least two modes.
1543	 */
1544	if ((ret == 0 && (kbd_info.levels != 0 || kbd_mode_levels_count >= 2))
1545	    || kbd_get_valid_token_counts() >= 2)
1546		kbd_led_present = true;
1547}
1548
1549static ssize_t kbd_led_timeout_store(struct device *dev,
1550				     struct device_attribute *attr,
1551				     const char *buf, size_t count)
1552{
1553	struct kbd_state new_state;
1554	struct kbd_state state;
1555	bool convert;
1556	int value;
1557	int ret;
1558	char ch;
1559	u8 unit;
1560	int i;
1561
1562	ret = sscanf(buf, "%d %c", &value, &ch);
1563	if (ret < 1)
1564		return -EINVAL;
1565	else if (ret == 1)
1566		ch = 's';
1567
1568	if (value < 0)
1569		return -EINVAL;
1570
1571	convert = false;
1572
1573	switch (ch) {
1574	case 's':
1575		if (value > kbd_info.seconds)
1576			convert = true;
1577		unit = KBD_TIMEOUT_SECONDS;
1578		break;
1579	case 'm':
1580		if (value > kbd_info.minutes)
1581			convert = true;
1582		unit = KBD_TIMEOUT_MINUTES;
1583		break;
1584	case 'h':
1585		if (value > kbd_info.hours)
1586			convert = true;
1587		unit = KBD_TIMEOUT_HOURS;
1588		break;
1589	case 'd':
1590		if (value > kbd_info.days)
1591			convert = true;
1592		unit = KBD_TIMEOUT_DAYS;
1593		break;
1594	default:
1595		return -EINVAL;
1596	}
1597
1598	if (quirks && quirks->needs_kbd_timeouts)
1599		convert = true;
1600
1601	if (convert) {
1602		/* Convert value from current units to seconds */
1603		switch (unit) {
1604		case KBD_TIMEOUT_DAYS:
1605			value *= 24;
1606			fallthrough;
1607		case KBD_TIMEOUT_HOURS:
1608			value *= 60;
1609			fallthrough;
1610		case KBD_TIMEOUT_MINUTES:
1611			value *= 60;
1612			unit = KBD_TIMEOUT_SECONDS;
1613		}
1614
1615		if (quirks && quirks->needs_kbd_timeouts) {
1616			for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1617				if (value <= quirks->kbd_timeouts[i]) {
1618					value = quirks->kbd_timeouts[i];
1619					break;
1620				}
1621			}
1622		}
1623
1624		if (value <= kbd_info.seconds && kbd_info.seconds) {
1625			unit = KBD_TIMEOUT_SECONDS;
1626		} else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1627			value /= 60;
1628			unit = KBD_TIMEOUT_MINUTES;
1629		} else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1630			value /= (60 * 60);
1631			unit = KBD_TIMEOUT_HOURS;
1632		} else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1633			value /= (60 * 60 * 24);
1634			unit = KBD_TIMEOUT_DAYS;
1635		} else {
1636			return -EINVAL;
1637		}
1638	}
1639
1640	mutex_lock(&kbd_led_mutex);
1641
1642	ret = kbd_get_state(&state);
1643	if (ret)
1644		goto out;
1645
1646	new_state = state;
1647
1648	if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1649		new_state.timeout_value_ac = value;
1650		new_state.timeout_unit_ac = unit;
1651	} else {
1652		new_state.timeout_value = value;
1653		new_state.timeout_unit = unit;
1654	}
1655
1656	ret = kbd_set_state_safe(&new_state, &state);
1657	if (ret)
1658		goto out;
1659
1660	ret = count;
1661out:
1662	mutex_unlock(&kbd_led_mutex);
1663	return ret;
1664}
1665
1666static ssize_t kbd_led_timeout_show(struct device *dev,
1667				    struct device_attribute *attr, char *buf)
1668{
1669	struct kbd_state state;
1670	int value;
1671	int ret;
1672	int len;
1673	u8 unit;
1674
1675	ret = kbd_get_state(&state);
1676	if (ret)
1677		return ret;
1678
1679	if (kbd_timeout_ac_supported && power_supply_is_system_supplied() > 0) {
1680		value = state.timeout_value_ac;
1681		unit = state.timeout_unit_ac;
1682	} else {
1683		value = state.timeout_value;
1684		unit = state.timeout_unit;
1685	}
1686
1687	len = sprintf(buf, "%d", value);
1688
1689	switch (unit) {
1690	case KBD_TIMEOUT_SECONDS:
1691		return len + sprintf(buf+len, "s\n");
1692	case KBD_TIMEOUT_MINUTES:
1693		return len + sprintf(buf+len, "m\n");
1694	case KBD_TIMEOUT_HOURS:
1695		return len + sprintf(buf+len, "h\n");
1696	case KBD_TIMEOUT_DAYS:
1697		return len + sprintf(buf+len, "d\n");
1698	default:
1699		return -EINVAL;
1700	}
1701
1702	return len;
1703}
1704
1705static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1706		   kbd_led_timeout_show, kbd_led_timeout_store);
1707
1708static const char * const kbd_led_triggers[] = {
1709	"keyboard",
1710	"touchpad",
1711	/*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1712	"mouse",
1713};
1714
1715static ssize_t kbd_led_triggers_store(struct device *dev,
1716				      struct device_attribute *attr,
1717				      const char *buf, size_t count)
1718{
1719	struct kbd_state new_state;
1720	struct kbd_state state;
1721	bool triggers_enabled = false;
1722	int trigger_bit = -1;
1723	char trigger[21];
1724	int i, ret;
1725
1726	ret = sscanf(buf, "%20s", trigger);
1727	if (ret != 1)
1728		return -EINVAL;
1729
1730	if (trigger[0] != '+' && trigger[0] != '-')
1731		return -EINVAL;
1732
1733	mutex_lock(&kbd_led_mutex);
1734
1735	ret = kbd_get_state(&state);
1736	if (ret)
1737		goto out;
1738
1739	if (kbd_triggers_supported)
1740		triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1741
1742	if (kbd_triggers_supported) {
1743		for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1744			if (!(kbd_info.triggers & BIT(i)))
1745				continue;
1746			if (!kbd_led_triggers[i])
1747				continue;
1748			if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1749				continue;
1750			if (trigger[0] == '+' &&
1751			    triggers_enabled && (state.triggers & BIT(i))) {
1752				ret = count;
1753				goto out;
1754			}
1755			if (trigger[0] == '-' &&
1756			    (!triggers_enabled || !(state.triggers & BIT(i)))) {
1757				ret = count;
1758				goto out;
1759			}
1760			trigger_bit = i;
1761			break;
1762		}
1763	}
1764
1765	if (trigger_bit == -1) {
1766		ret = -EINVAL;
1767		goto out;
1768	}
1769
1770	new_state = state;
1771	if (trigger[0] == '+')
1772		new_state.triggers |= BIT(trigger_bit);
1773	else {
1774		new_state.triggers &= ~BIT(trigger_bit);
1775		/*
1776		 * NOTE: trackstick bit (2) must be disabled when
1777		 *       disabling touchpad bit (1), otherwise touchpad
1778		 *       bit (1) will not be disabled
1779		 */
1780		if (trigger_bit == 1)
1781			new_state.triggers &= ~BIT(2);
1782	}
1783	if ((kbd_info.triggers & new_state.triggers) !=
1784	    new_state.triggers) {
1785		ret = -EINVAL;
1786		goto out;
1787	}
1788	if (new_state.triggers && !triggers_enabled) {
1789		new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1790		kbd_set_level(&new_state, kbd_previous_level);
1791	} else if (new_state.triggers == 0) {
1792		kbd_set_level(&new_state, 0);
1793	}
1794	if (!(kbd_info.modes & BIT(new_state.mode_bit))) {
1795		ret = -EINVAL;
1796		goto out;
1797	}
1798	ret = kbd_set_state_safe(&new_state, &state);
1799	if (ret)
1800		goto out;
1801	if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1802		kbd_previous_mode_bit = new_state.mode_bit;
1803	ret = count;
1804out:
1805	mutex_unlock(&kbd_led_mutex);
1806	return ret;
1807}
1808
1809static ssize_t kbd_led_triggers_show(struct device *dev,
1810				     struct device_attribute *attr, char *buf)
1811{
1812	struct kbd_state state;
1813	bool triggers_enabled;
1814	int level, i, ret;
1815	int len = 0;
1816
1817	ret = kbd_get_state(&state);
1818	if (ret)
1819		return ret;
1820
1821	len = 0;
1822
1823	if (kbd_triggers_supported) {
1824		triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1825		level = kbd_get_level(&state);
1826		for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1827			if (!(kbd_info.triggers & BIT(i)))
1828				continue;
1829			if (!kbd_led_triggers[i])
1830				continue;
1831			if ((triggers_enabled || level <= 0) &&
1832			    (state.triggers & BIT(i)))
1833				buf[len++] = '+';
1834			else
1835				buf[len++] = '-';
1836			len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1837		}
1838	}
1839
1840	if (len)
1841		buf[len - 1] = '\n';
1842
1843	return len;
1844}
1845
1846static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1847		   kbd_led_triggers_show, kbd_led_triggers_store);
1848
1849static ssize_t kbd_led_als_enabled_store(struct device *dev,
1850					 struct device_attribute *attr,
1851					 const char *buf, size_t count)
1852{
1853	struct kbd_state new_state;
1854	struct kbd_state state;
1855	bool triggers_enabled = false;
1856	int enable;
1857	int ret;
1858
1859	ret = kstrtoint(buf, 0, &enable);
1860	if (ret)
1861		return ret;
1862
1863	mutex_lock(&kbd_led_mutex);
1864
1865	ret = kbd_get_state(&state);
1866	if (ret)
1867		goto out;
1868
1869	if (enable == kbd_is_als_mode_bit(state.mode_bit)) {
1870		ret = count;
1871		goto out;
1872	}
1873
1874	new_state = state;
1875
1876	if (kbd_triggers_supported)
1877		triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1878
1879	if (enable) {
1880		if (triggers_enabled)
1881			new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1882		else
1883			new_state.mode_bit = KBD_MODE_BIT_ALS;
1884	} else {
1885		if (triggers_enabled) {
1886			new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1887			kbd_set_level(&new_state, kbd_previous_level);
1888		} else {
1889			new_state.mode_bit = KBD_MODE_BIT_ON;
1890		}
1891	}
1892	if (!(kbd_info.modes & BIT(new_state.mode_bit)))  {
1893		ret = -EINVAL;
1894		goto out;
1895	}
1896
1897	ret = kbd_set_state_safe(&new_state, &state);
1898	if (ret)
1899		goto out;
1900	kbd_previous_mode_bit = new_state.mode_bit;
1901
1902	ret = count;
1903out:
1904	mutex_unlock(&kbd_led_mutex);
1905	return ret;
1906}
1907
1908static ssize_t kbd_led_als_enabled_show(struct device *dev,
1909					struct device_attribute *attr,
1910					char *buf)
1911{
1912	struct kbd_state state;
1913	bool enabled = false;
1914	int ret;
1915
1916	ret = kbd_get_state(&state);
1917	if (ret)
1918		return ret;
1919	enabled = kbd_is_als_mode_bit(state.mode_bit);
1920
1921	return sprintf(buf, "%d\n", enabled ? 1 : 0);
1922}
1923
1924static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1925		   kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1926
1927static ssize_t kbd_led_als_setting_store(struct device *dev,
1928					 struct device_attribute *attr,
1929					 const char *buf, size_t count)
1930{
1931	struct kbd_state state;
1932	struct kbd_state new_state;
1933	u8 setting;
1934	int ret;
1935
1936	ret = kstrtou8(buf, 10, &setting);
1937	if (ret)
1938		return ret;
1939
1940	mutex_lock(&kbd_led_mutex);
1941
1942	ret = kbd_get_state(&state);
1943	if (ret)
1944		goto out;
1945
1946	new_state = state;
1947	new_state.als_setting = setting;
1948
1949	ret = kbd_set_state_safe(&new_state, &state);
1950	if (ret)
1951		goto out;
1952
1953	ret = count;
1954out:
1955	mutex_unlock(&kbd_led_mutex);
1956	return ret;
1957}
1958
1959static ssize_t kbd_led_als_setting_show(struct device *dev,
1960					struct device_attribute *attr,
1961					char *buf)
1962{
1963	struct kbd_state state;
1964	int ret;
1965
1966	ret = kbd_get_state(&state);
1967	if (ret)
1968		return ret;
1969
1970	return sprintf(buf, "%d\n", state.als_setting);
1971}
1972
1973static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1974		   kbd_led_als_setting_show, kbd_led_als_setting_store);
1975
1976static struct attribute *kbd_led_attrs[] = {
1977	&dev_attr_stop_timeout.attr,
1978	&dev_attr_start_triggers.attr,
1979	NULL,
1980};
1981
1982static const struct attribute_group kbd_led_group = {
1983	.attrs = kbd_led_attrs,
1984};
1985
1986static struct attribute *kbd_led_als_attrs[] = {
1987	&dev_attr_als_enabled.attr,
1988	&dev_attr_als_setting.attr,
1989	NULL,
1990};
1991
1992static const struct attribute_group kbd_led_als_group = {
1993	.attrs = kbd_led_als_attrs,
1994};
1995
1996static const struct attribute_group *kbd_led_groups[] = {
1997	&kbd_led_group,
1998	&kbd_led_als_group,
1999	NULL,
2000};
2001
2002static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
2003{
2004	int ret;
2005	u16 num;
2006	struct kbd_state state;
2007
2008	if (kbd_get_max_level()) {
2009		ret = kbd_get_state(&state);
2010		if (ret)
2011			return 0;
2012		ret = kbd_get_level(&state);
2013		if (ret < 0)
2014			return 0;
2015		return ret;
2016	}
2017
2018	if (kbd_get_valid_token_counts()) {
2019		ret = kbd_get_first_active_token_bit();
2020		if (ret < 0)
2021			return 0;
2022		for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
2023			num &= num - 1; /* clear the first bit set */
2024		if (num == 0)
2025			return 0;
2026		return ffs(num) - 1;
2027	}
2028
2029	pr_warn("Keyboard brightness level control not supported\n");
2030	return 0;
2031}
2032
2033static int kbd_led_level_set(struct led_classdev *led_cdev,
2034			     enum led_brightness value)
2035{
2036	enum led_brightness new_value = value;
2037	struct kbd_state state;
2038	struct kbd_state new_state;
2039	u16 num;
2040	int ret;
2041
2042	mutex_lock(&kbd_led_mutex);
2043
2044	if (kbd_get_max_level()) {
2045		ret = kbd_get_state(&state);
2046		if (ret)
2047			goto out;
2048		new_state = state;
2049		ret = kbd_set_level(&new_state, value);
2050		if (ret)
2051			goto out;
2052		ret = kbd_set_state_safe(&new_state, &state);
2053	} else if (kbd_get_valid_token_counts()) {
2054		for (num = kbd_token_bits; num != 0 && value > 0; --value)
2055			num &= num - 1; /* clear the first bit set */
2056		if (num == 0)
2057			ret = 0;
2058		else
2059			ret = kbd_set_token_bit(ffs(num) - 1);
2060	} else {
2061		pr_warn("Keyboard brightness level control not supported\n");
2062		ret = -ENXIO;
2063	}
2064
2065out:
2066	if (ret == 0)
2067		kbd_led_level = new_value;
2068
2069	mutex_unlock(&kbd_led_mutex);
2070	return ret;
2071}
2072
2073static struct led_classdev kbd_led = {
2074	.name           = "dell::kbd_backlight",
2075	.flags		= LED_BRIGHT_HW_CHANGED,
2076	.brightness_set_blocking = kbd_led_level_set,
2077	.brightness_get = kbd_led_level_get,
2078	.groups         = kbd_led_groups,
2079};
2080
2081static int __init kbd_led_init(struct device *dev)
2082{
2083	int ret;
2084
2085	kbd_init();
2086	if (!kbd_led_present)
2087		return -ENODEV;
2088	if (!kbd_als_supported)
2089		kbd_led_groups[1] = NULL;
2090	kbd_led.max_brightness = kbd_get_max_level();
2091	if (!kbd_led.max_brightness) {
2092		kbd_led.max_brightness = kbd_get_valid_token_counts();
2093		if (kbd_led.max_brightness)
2094			kbd_led.max_brightness--;
2095	}
2096
2097	kbd_led_level = kbd_led_level_get(NULL);
2098
2099	ret = led_classdev_register(dev, &kbd_led);
2100	if (ret)
2101		kbd_led_present = false;
2102
2103	return ret;
2104}
2105
2106static void brightness_set_exit(struct led_classdev *led_cdev,
2107				enum led_brightness value)
2108{
2109	/* Don't change backlight level on exit */
2110};
2111
2112static void kbd_led_exit(void)
2113{
2114	if (!kbd_led_present)
2115		return;
2116	kbd_led.brightness_set = brightness_set_exit;
2117	led_classdev_unregister(&kbd_led);
2118}
2119
2120static int dell_laptop_notifier_call(struct notifier_block *nb,
2121				     unsigned long action, void *data)
2122{
2123	bool changed = false;
2124	enum led_brightness new_kbd_led_level;
2125
2126	switch (action) {
2127	case DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED:
2128		if (!kbd_led_present)
2129			break;
2130
2131		mutex_lock(&kbd_led_mutex);
2132		new_kbd_led_level = kbd_led_level_get(&kbd_led);
2133		if (kbd_led_level != new_kbd_led_level) {
2134			kbd_led_level = new_kbd_led_level;
2135			changed = true;
2136		}
2137		mutex_unlock(&kbd_led_mutex);
2138
2139		if (changed)
2140			led_classdev_notify_brightness_hw_changed(&kbd_led,
2141								kbd_led_level);
2142		break;
2143	}
2144
2145	return NOTIFY_OK;
2146}
2147
2148static struct notifier_block dell_laptop_notifier = {
2149	.notifier_call = dell_laptop_notifier_call,
2150};
2151
2152static int micmute_led_set(struct led_classdev *led_cdev,
2153			   enum led_brightness brightness)
2154{
2155	struct calling_interface_buffer buffer;
2156	struct calling_interface_token *token;
2157	int state = brightness != LED_OFF;
2158
2159	if (state == 0)
2160		token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
2161	else
2162		token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
2163
2164	if (!token)
2165		return -ENODEV;
2166
2167	dell_fill_request(&buffer, token->location, token->value, 0, 0);
2168	dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
2169
2170	return 0;
2171}
2172
2173static struct led_classdev micmute_led_cdev = {
2174	.name = "platform::micmute",
2175	.max_brightness = 1,
2176	.brightness_set_blocking = micmute_led_set,
2177	.default_trigger = "audio-micmute",
2178};
2179
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2180static int __init dell_init(void)
2181{
2182	struct calling_interface_token *token;
2183	int max_intensity = 0;
2184	int ret;
2185
2186	if (!dmi_check_system(dell_device_table))
2187		return -ENODEV;
2188
2189	quirks = NULL;
2190	/* find if this machine support other functions */
2191	dmi_check_system(dell_quirks);
2192
2193	ret = platform_driver_register(&platform_driver);
2194	if (ret)
2195		goto fail_platform_driver;
2196	platform_device = platform_device_alloc("dell-laptop", PLATFORM_DEVID_NONE);
2197	if (!platform_device) {
2198		ret = -ENOMEM;
2199		goto fail_platform_device1;
2200	}
2201	ret = platform_device_add(platform_device);
2202	if (ret)
2203		goto fail_platform_device2;
2204
2205	ret = dell_setup_rfkill();
2206
2207	if (ret) {
2208		pr_warn("Unable to setup rfkill\n");
2209		goto fail_rfkill;
2210	}
2211
2212	if (quirks && quirks->touchpad_led)
2213		touchpad_led_init(&platform_device->dev);
2214
2215	kbd_led_init(&platform_device->dev);
2216
2217	dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
2218	debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
2219			    &dell_debugfs_fops);
2220
2221	dell_laptop_register_notifier(&dell_laptop_notifier);
2222
2223	if (dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE) &&
2224	    dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE) &&
2225	    !dell_privacy_has_mic_mute()) {
2226		micmute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
2227		ret = led_classdev_register(&platform_device->dev, &micmute_led_cdev);
2228		if (ret < 0)
2229			goto fail_led;
2230		micmute_led_registered = true;
2231	}
2232
 
 
 
 
 
 
 
 
 
2233	if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
2234		return 0;
2235
2236	token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
2237	if (token) {
2238		struct calling_interface_buffer buffer;
2239
2240		dell_fill_request(&buffer, token->location, 0, 0, 0);
2241		ret = dell_send_request(&buffer,
2242					CLASS_TOKEN_READ, SELECT_TOKEN_AC);
2243		if (ret == 0)
2244			max_intensity = buffer.output[3];
2245	}
2246
2247	if (max_intensity) {
2248		struct backlight_properties props;
2249		memset(&props, 0, sizeof(struct backlight_properties));
2250		props.type = BACKLIGHT_PLATFORM;
2251		props.max_brightness = max_intensity;
2252		dell_backlight_device = backlight_device_register("dell_backlight",
2253								  &platform_device->dev,
2254								  NULL,
2255								  &dell_ops,
2256								  &props);
2257
2258		if (IS_ERR(dell_backlight_device)) {
2259			ret = PTR_ERR(dell_backlight_device);
2260			dell_backlight_device = NULL;
2261			goto fail_backlight;
2262		}
2263
2264		dell_backlight_device->props.brightness =
2265			dell_get_intensity(dell_backlight_device);
2266		if (dell_backlight_device->props.brightness < 0) {
2267			ret = dell_backlight_device->props.brightness;
2268			goto fail_get_brightness;
2269		}
2270		backlight_update_status(dell_backlight_device);
2271	}
2272
2273	return 0;
2274
2275fail_get_brightness:
2276	backlight_device_unregister(dell_backlight_device);
2277fail_backlight:
2278	if (micmute_led_registered)
2279		led_classdev_unregister(&micmute_led_cdev);
 
 
2280fail_led:
2281	dell_cleanup_rfkill();
2282fail_rfkill:
2283	platform_device_del(platform_device);
2284fail_platform_device2:
2285	platform_device_put(platform_device);
2286fail_platform_device1:
2287	platform_driver_unregister(&platform_driver);
2288fail_platform_driver:
2289	return ret;
2290}
2291
2292static void __exit dell_exit(void)
2293{
2294	dell_laptop_unregister_notifier(&dell_laptop_notifier);
2295	debugfs_remove_recursive(dell_laptop_dir);
2296	if (quirks && quirks->touchpad_led)
2297		touchpad_led_exit();
2298	kbd_led_exit();
2299	backlight_device_unregister(dell_backlight_device);
2300	if (micmute_led_registered)
2301		led_classdev_unregister(&micmute_led_cdev);
 
 
2302	dell_cleanup_rfkill();
2303	if (platform_device) {
2304		platform_device_unregister(platform_device);
2305		platform_driver_unregister(&platform_driver);
2306	}
2307}
2308
2309/* dell-rbtn.c driver export functions which will not work correctly (and could
2310 * cause kernel crash) if they are called before dell-rbtn.c init code. This is
2311 * not problem when dell-rbtn.c is compiled as external module. When both files
2312 * (dell-rbtn.c and dell-laptop.c) are compiled statically into kernel, then we
2313 * need to ensure that dell_init() will be called after initializing dell-rbtn.
2314 * This can be achieved by late_initcall() instead module_init().
2315 */
2316late_initcall(dell_init);
2317module_exit(dell_exit);
2318
2319MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2320MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2321MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
2322MODULE_DESCRIPTION("Dell laptop driver");
2323MODULE_LICENSE("GPL");