cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

dell-laptop.c (60750B)


      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", -1);
   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");