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OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  Driver for Dell laptop extras
0004  *
0005  *  Copyright (c) Red Hat <mjg@redhat.com>
0006  *  Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
0007  *  Copyright (c) 2014 Pali Rohár <pali@kernel.org>
0008  *
0009  *  Based on documentation in the libsmbios package:
0010  *  Copyright (C) 2005-2014 Dell Inc.
0011  */
0012 
0013 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0014 
0015 #include <linux/module.h>
0016 #include <linux/kernel.h>
0017 #include <linux/init.h>
0018 #include <linux/platform_device.h>
0019 #include <linux/backlight.h>
0020 #include <linux/err.h>
0021 #include <linux/dmi.h>
0022 #include <linux/io.h>
0023 #include <linux/rfkill.h>
0024 #include <linux/power_supply.h>
0025 #include <linux/acpi.h>
0026 #include <linux/mm.h>
0027 #include <linux/i8042.h>
0028 #include <linux/debugfs.h>
0029 #include <linux/seq_file.h>
0030 #include <acpi/video.h>
0031 #include "dell-rbtn.h"
0032 #include "dell-smbios.h"
0033 
0034 #include "dell-wmi-privacy.h"
0035 
0036 struct quirk_entry {
0037     bool touchpad_led;
0038     bool kbd_led_not_present;
0039     bool kbd_led_levels_off_1;
0040     bool kbd_missing_ac_tag;
0041 
0042     bool needs_kbd_timeouts;
0043     /*
0044      * Ordered list of timeouts expressed in seconds.
0045      * The list must end with -1
0046      */
0047     int kbd_timeouts[];
0048 };
0049 
0050 static struct quirk_entry *quirks;
0051 
0052 static struct quirk_entry quirk_dell_vostro_v130 = {
0053     .touchpad_led = true,
0054 };
0055 
0056 static int __init dmi_matched(const struct dmi_system_id *dmi)
0057 {
0058     quirks = dmi->driver_data;
0059     return 1;
0060 }
0061 
0062 /*
0063  * These values come from Windows utility provided by Dell. If any other value
0064  * is used then BIOS silently set timeout to 0 without any error message.
0065  */
0066 static struct quirk_entry quirk_dell_xps13_9333 = {
0067     .needs_kbd_timeouts = true,
0068     .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
0069 };
0070 
0071 static struct quirk_entry quirk_dell_xps13_9370 = {
0072     .kbd_missing_ac_tag = true,
0073 };
0074 
0075 static struct quirk_entry quirk_dell_latitude_e6410 = {
0076     .kbd_led_levels_off_1 = true,
0077 };
0078 
0079 static struct quirk_entry quirk_dell_inspiron_1012 = {
0080     .kbd_led_not_present = true,
0081 };
0082 
0083 static struct quirk_entry quirk_dell_latitude_7520 = {
0084     .kbd_missing_ac_tag = true,
0085 };
0086 
0087 static struct platform_driver platform_driver = {
0088     .driver = {
0089         .name = "dell-laptop",
0090     }
0091 };
0092 
0093 static struct platform_device *platform_device;
0094 static struct backlight_device *dell_backlight_device;
0095 static struct rfkill *wifi_rfkill;
0096 static struct rfkill *bluetooth_rfkill;
0097 static struct rfkill *wwan_rfkill;
0098 static bool force_rfkill;
0099 static bool micmute_led_registered;
0100 
0101 module_param(force_rfkill, bool, 0444);
0102 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
0103 
0104 static const struct dmi_system_id dell_device_table[] __initconst = {
0105     {
0106         .ident = "Dell laptop",
0107         .matches = {
0108             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0109             DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
0110         },
0111     },
0112     {
0113         .matches = {
0114             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0115             DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
0116         },
0117     },
0118     {
0119         .matches = {
0120             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0121             DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /*Notebook*/
0122         },
0123     },
0124     {
0125         .matches = {
0126             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0127             DMI_MATCH(DMI_CHASSIS_TYPE, "30"), /*Tablet*/
0128         },
0129     },
0130     {
0131         .matches = {
0132             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0133             DMI_MATCH(DMI_CHASSIS_TYPE, "31"), /*Convertible*/
0134         },
0135     },
0136     {
0137         .matches = {
0138             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0139             DMI_MATCH(DMI_CHASSIS_TYPE, "32"), /*Detachable*/
0140         },
0141     },
0142     {
0143         .ident = "Dell Computer Corporation",
0144         .matches = {
0145             DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
0146             DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
0147         },
0148     },
0149     { }
0150 };
0151 MODULE_DEVICE_TABLE(dmi, dell_device_table);
0152 
0153 static const struct dmi_system_id dell_quirks[] __initconst = {
0154     {
0155         .callback = dmi_matched,
0156         .ident = "Dell Vostro V130",
0157         .matches = {
0158             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0159             DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
0160         },
0161         .driver_data = &quirk_dell_vostro_v130,
0162     },
0163     {
0164         .callback = dmi_matched,
0165         .ident = "Dell Vostro V131",
0166         .matches = {
0167             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0168             DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
0169         },
0170         .driver_data = &quirk_dell_vostro_v130,
0171     },
0172     {
0173         .callback = dmi_matched,
0174         .ident = "Dell Vostro 3350",
0175         .matches = {
0176             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0177             DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
0178         },
0179         .driver_data = &quirk_dell_vostro_v130,
0180     },
0181     {
0182         .callback = dmi_matched,
0183         .ident = "Dell Vostro 3555",
0184         .matches = {
0185             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0186             DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
0187         },
0188         .driver_data = &quirk_dell_vostro_v130,
0189     },
0190     {
0191         .callback = dmi_matched,
0192         .ident = "Dell Inspiron N311z",
0193         .matches = {
0194             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0195             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
0196         },
0197         .driver_data = &quirk_dell_vostro_v130,
0198     },
0199     {
0200         .callback = dmi_matched,
0201         .ident = "Dell Inspiron M5110",
0202         .matches = {
0203             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0204             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
0205         },
0206         .driver_data = &quirk_dell_vostro_v130,
0207     },
0208     {
0209         .callback = dmi_matched,
0210         .ident = "Dell Vostro 3360",
0211         .matches = {
0212             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0213             DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
0214         },
0215         .driver_data = &quirk_dell_vostro_v130,
0216     },
0217     {
0218         .callback = dmi_matched,
0219         .ident = "Dell Vostro 3460",
0220         .matches = {
0221             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0222             DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
0223         },
0224         .driver_data = &quirk_dell_vostro_v130,
0225     },
0226     {
0227         .callback = dmi_matched,
0228         .ident = "Dell Vostro 3560",
0229         .matches = {
0230             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0231             DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
0232         },
0233         .driver_data = &quirk_dell_vostro_v130,
0234     },
0235     {
0236         .callback = dmi_matched,
0237         .ident = "Dell Vostro 3450",
0238         .matches = {
0239             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0240             DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
0241         },
0242         .driver_data = &quirk_dell_vostro_v130,
0243     },
0244     {
0245         .callback = dmi_matched,
0246         .ident = "Dell Inspiron 5420",
0247         .matches = {
0248             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0249             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
0250         },
0251         .driver_data = &quirk_dell_vostro_v130,
0252     },
0253     {
0254         .callback = dmi_matched,
0255         .ident = "Dell Inspiron 5520",
0256         .matches = {
0257             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0258             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
0259         },
0260         .driver_data = &quirk_dell_vostro_v130,
0261     },
0262     {
0263         .callback = dmi_matched,
0264         .ident = "Dell Inspiron 5720",
0265         .matches = {
0266             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0267             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
0268         },
0269         .driver_data = &quirk_dell_vostro_v130,
0270     },
0271     {
0272         .callback = dmi_matched,
0273         .ident = "Dell Inspiron 7420",
0274         .matches = {
0275             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0276             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
0277         },
0278         .driver_data = &quirk_dell_vostro_v130,
0279     },
0280     {
0281         .callback = dmi_matched,
0282         .ident = "Dell Inspiron 7520",
0283         .matches = {
0284             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0285             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
0286         },
0287         .driver_data = &quirk_dell_vostro_v130,
0288     },
0289     {
0290         .callback = dmi_matched,
0291         .ident = "Dell Inspiron 7720",
0292         .matches = {
0293             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0294             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
0295         },
0296         .driver_data = &quirk_dell_vostro_v130,
0297     },
0298     {
0299         .callback = dmi_matched,
0300         .ident = "Dell XPS13 9333",
0301         .matches = {
0302             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0303             DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
0304         },
0305         .driver_data = &quirk_dell_xps13_9333,
0306     },
0307     {
0308         .callback = dmi_matched,
0309         .ident = "Dell XPS 13 9370",
0310         .matches = {
0311             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0312             DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9370"),
0313         },
0314         .driver_data = &quirk_dell_xps13_9370,
0315     },
0316     {
0317         .callback = dmi_matched,
0318         .ident = "Dell Latitude E6410",
0319         .matches = {
0320             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0321             DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6410"),
0322         },
0323         .driver_data = &quirk_dell_latitude_e6410,
0324     },
0325     {
0326         .callback = dmi_matched,
0327         .ident = "Dell Inspiron 1012",
0328         .matches = {
0329             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0330             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
0331         },
0332         .driver_data = &quirk_dell_inspiron_1012,
0333     },
0334     {
0335         .callback = dmi_matched,
0336         .ident = "Dell Inspiron 1018",
0337         .matches = {
0338             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0339             DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1018"),
0340         },
0341         .driver_data = &quirk_dell_inspiron_1012,
0342     },
0343     {
0344         .callback = dmi_matched,
0345         .ident = "Dell Latitude 7520",
0346         .matches = {
0347             DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
0348             DMI_MATCH(DMI_PRODUCT_NAME, "Latitude 7520"),
0349         },
0350         .driver_data = &quirk_dell_latitude_7520,
0351     },
0352     { }
0353 };
0354 
0355 static void dell_fill_request(struct calling_interface_buffer *buffer,
0356                    u32 arg0, u32 arg1, u32 arg2, u32 arg3)
0357 {
0358     memset(buffer, 0, sizeof(struct calling_interface_buffer));
0359     buffer->input[0] = arg0;
0360     buffer->input[1] = arg1;
0361     buffer->input[2] = arg2;
0362     buffer->input[3] = arg3;
0363 }
0364 
0365 static int dell_send_request(struct calling_interface_buffer *buffer,
0366                  u16 class, u16 select)
0367 {
0368     int ret;
0369 
0370     buffer->cmd_class = class;
0371     buffer->cmd_select = select;
0372     ret = dell_smbios_call(buffer);
0373     if (ret != 0)
0374         return ret;
0375     return dell_smbios_error(buffer->output[0]);
0376 }
0377 
0378 /*
0379  * Derived from information in smbios-wireless-ctl:
0380  *
0381  * cbSelect 17, Value 11
0382  *
0383  * Return Wireless Info
0384  * cbArg1, byte0 = 0x00
0385  *
0386  *     cbRes1 Standard return codes (0, -1, -2)
0387  *     cbRes2 Info bit flags:
0388  *
0389  *     0 Hardware switch supported (1)
0390  *     1 WiFi locator supported (1)
0391  *     2 WLAN supported (1)
0392  *     3 Bluetooth (BT) supported (1)
0393  *     4 WWAN supported (1)
0394  *     5 Wireless KBD supported (1)
0395  *     6 Uw b supported (1)
0396  *     7 WiGig supported (1)
0397  *     8 WLAN installed (1)
0398  *     9 BT installed (1)
0399  *     10 WWAN installed (1)
0400  *     11 Uw b installed (1)
0401  *     12 WiGig installed (1)
0402  *     13-15 Reserved (0)
0403  *     16 Hardware (HW) switch is On (1)
0404  *     17 WLAN disabled (1)
0405  *     18 BT disabled (1)
0406  *     19 WWAN disabled (1)
0407  *     20 Uw b disabled (1)
0408  *     21 WiGig disabled (1)
0409  *     20-31 Reserved (0)
0410  *
0411  *     cbRes3 NVRAM size in bytes
0412  *     cbRes4, byte 0 NVRAM format version number
0413  *
0414  *
0415  * Set QuickSet Radio Disable Flag
0416  *     cbArg1, byte0 = 0x01
0417  *     cbArg1, byte1
0418  *     Radio ID     value:
0419  *     0        Radio Status
0420  *     1        WLAN ID
0421  *     2        BT ID
0422  *     3        WWAN ID
0423  *     4        UWB ID
0424  *     5        WIGIG ID
0425  *     cbArg1, byte2    Flag bits:
0426  *             0 QuickSet disables radio (1)
0427  *             1-7 Reserved (0)
0428  *
0429  *     cbRes1    Standard return codes (0, -1, -2)
0430  *     cbRes2    QuickSet (QS) radio disable bit map:
0431  *     0 QS disables WLAN
0432  *     1 QS disables BT
0433  *     2 QS disables WWAN
0434  *     3 QS disables UWB
0435  *     4 QS disables WIGIG
0436  *     5-31 Reserved (0)
0437  *
0438  * Wireless Switch Configuration
0439  *     cbArg1, byte0 = 0x02
0440  *
0441  *     cbArg1, byte1
0442  *     Subcommand:
0443  *     0 Get config
0444  *     1 Set config
0445  *     2 Set WiFi locator enable/disable
0446  *     cbArg1,byte2
0447  *     Switch settings (if byte 1==1):
0448  *     0 WLAN sw itch control (1)
0449  *     1 BT sw itch control (1)
0450  *     2 WWAN sw itch control (1)
0451  *     3 UWB sw itch control (1)
0452  *     4 WiGig sw itch control (1)
0453  *     5-7 Reserved (0)
0454  *    cbArg1, byte2 Enable bits (if byte 1==2):
0455  *     0 Enable WiFi locator (1)
0456  *
0457  *    cbRes1     Standard return codes (0, -1, -2)
0458  *    cbRes2 QuickSet radio disable bit map:
0459  *     0 WLAN controlled by sw itch (1)
0460  *     1 BT controlled by sw itch (1)
0461  *     2 WWAN controlled by sw itch (1)
0462  *     3 UWB controlled by sw itch (1)
0463  *     4 WiGig controlled by sw itch (1)
0464  *     5-6 Reserved (0)
0465  *     7 Wireless sw itch config locked (1)
0466  *     8 WiFi locator enabled (1)
0467  *     9-14 Reserved (0)
0468  *     15 WiFi locator setting locked (1)
0469  *     16-31 Reserved (0)
0470  *
0471  * Read Local Config Data (LCD)
0472  *     cbArg1, byte0 = 0x10
0473  *     cbArg1, byte1 NVRAM index low byte
0474  *     cbArg1, byte2 NVRAM index high byte
0475  *     cbRes1 Standard return codes (0, -1, -2)
0476  *     cbRes2 4 bytes read from LCD[index]
0477  *     cbRes3 4 bytes read from LCD[index+4]
0478  *     cbRes4 4 bytes read from LCD[index+8]
0479  *
0480  * Write Local Config Data (LCD)
0481  *     cbArg1, byte0 = 0x11
0482  *     cbArg1, byte1 NVRAM index low byte
0483  *     cbArg1, byte2 NVRAM index high byte
0484  *     cbArg2 4 bytes to w rite at LCD[index]
0485  *     cbArg3 4 bytes to w rite at LCD[index+4]
0486  *     cbArg4 4 bytes to w rite at LCD[index+8]
0487  *     cbRes1 Standard return codes (0, -1, -2)
0488  *
0489  * Populate Local Config Data from NVRAM
0490  *     cbArg1, byte0 = 0x12
0491  *     cbRes1 Standard return codes (0, -1, -2)
0492  *
0493  * Commit Local Config Data to NVRAM
0494  *     cbArg1, byte0 = 0x13
0495  *     cbRes1 Standard return codes (0, -1, -2)
0496  */
0497 
0498 static int dell_rfkill_set(void *data, bool blocked)
0499 {
0500     int disable = blocked ? 1 : 0;
0501     unsigned long radio = (unsigned long)data;
0502     int hwswitch_bit = (unsigned long)data - 1;
0503     struct calling_interface_buffer buffer;
0504     int hwswitch;
0505     int status;
0506     int ret;
0507 
0508     dell_fill_request(&buffer, 0, 0, 0, 0);
0509     ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0510     if (ret)
0511         return ret;
0512     status = buffer.output[1];
0513 
0514     dell_fill_request(&buffer, 0x2, 0, 0, 0);
0515     ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0516     if (ret)
0517         return ret;
0518     hwswitch = buffer.output[1];
0519 
0520     /* If the hardware switch controls this radio, and the hardware
0521        switch is disabled, always disable the radio */
0522     if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
0523         (status & BIT(0)) && !(status & BIT(16)))
0524         disable = 1;
0525 
0526     dell_fill_request(&buffer, 1 | (radio<<8) | (disable << 16), 0, 0, 0);
0527     ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0528     return ret;
0529 }
0530 
0531 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
0532                     int status)
0533 {
0534     if (status & BIT(0)) {
0535         /* Has hw-switch, sync sw_state to BIOS */
0536         struct calling_interface_buffer buffer;
0537         int block = rfkill_blocked(rfkill);
0538         dell_fill_request(&buffer,
0539                    1 | (radio << 8) | (block << 16), 0, 0, 0);
0540         dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0541     } else {
0542         /* No hw-switch, sync BIOS state to sw_state */
0543         rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
0544     }
0545 }
0546 
0547 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
0548                     int status, int hwswitch)
0549 {
0550     if (hwswitch & (BIT(radio - 1)))
0551         rfkill_set_hw_state(rfkill, !(status & BIT(16)));
0552 }
0553 
0554 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
0555 {
0556     int radio = ((unsigned long)data & 0xF);
0557     struct calling_interface_buffer buffer;
0558     int hwswitch;
0559     int status;
0560     int ret;
0561 
0562     dell_fill_request(&buffer, 0, 0, 0, 0);
0563     ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0564     status = buffer.output[1];
0565 
0566     if (ret != 0 || !(status & BIT(0))) {
0567         return;
0568     }
0569 
0570     dell_fill_request(&buffer, 0x2, 0, 0, 0);
0571     ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0572     hwswitch = buffer.output[1];
0573 
0574     if (ret != 0)
0575         return;
0576 
0577     dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
0578 }
0579 
0580 static const struct rfkill_ops dell_rfkill_ops = {
0581     .set_block = dell_rfkill_set,
0582     .query = dell_rfkill_query,
0583 };
0584 
0585 static struct dentry *dell_laptop_dir;
0586 
0587 static int dell_debugfs_show(struct seq_file *s, void *data)
0588 {
0589     struct calling_interface_buffer buffer;
0590     int hwswitch_state;
0591     int hwswitch_ret;
0592     int status;
0593     int ret;
0594 
0595     dell_fill_request(&buffer, 0, 0, 0, 0);
0596     ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0597     if (ret)
0598         return ret;
0599     status = buffer.output[1];
0600 
0601     dell_fill_request(&buffer, 0x2, 0, 0, 0);
0602     hwswitch_ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0603     if (hwswitch_ret)
0604         return hwswitch_ret;
0605     hwswitch_state = buffer.output[1];
0606 
0607     seq_printf(s, "return:\t%d\n", ret);
0608     seq_printf(s, "status:\t0x%X\n", status);
0609     seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
0610            status & BIT(0));
0611     seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
0612           (status & BIT(1)) >> 1);
0613     seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
0614           (status & BIT(2)) >> 2);
0615     seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
0616           (status & BIT(3)) >> 3);
0617     seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
0618           (status & BIT(4)) >> 4);
0619     seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
0620           (status & BIT(5)) >> 5);
0621     seq_printf(s, "Bit 6 : UWB supported:               %lu\n",
0622           (status & BIT(6)) >> 6);
0623     seq_printf(s, "Bit 7 : WiGig supported:             %lu\n",
0624           (status & BIT(7)) >> 7);
0625     seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
0626           (status & BIT(8)) >> 8);
0627     seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
0628           (status & BIT(9)) >> 9);
0629     seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
0630           (status & BIT(10)) >> 10);
0631     seq_printf(s, "Bit 11: UWB installed:               %lu\n",
0632           (status & BIT(11)) >> 11);
0633     seq_printf(s, "Bit 12: WiGig installed:             %lu\n",
0634           (status & BIT(12)) >> 12);
0635 
0636     seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
0637           (status & BIT(16)) >> 16);
0638     seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
0639           (status & BIT(17)) >> 17);
0640     seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
0641           (status & BIT(18)) >> 18);
0642     seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
0643           (status & BIT(19)) >> 19);
0644     seq_printf(s, "Bit 20: UWB is blocked:              %lu\n",
0645           (status & BIT(20)) >> 20);
0646     seq_printf(s, "Bit 21: WiGig is blocked:            %lu\n",
0647           (status & BIT(21)) >> 21);
0648 
0649     seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
0650     seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
0651     seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
0652            hwswitch_state & BIT(0));
0653     seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
0654            (hwswitch_state & BIT(1)) >> 1);
0655     seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
0656            (hwswitch_state & BIT(2)) >> 2);
0657     seq_printf(s, "Bit 3 : UWB controlled by switch:       %lu\n",
0658            (hwswitch_state & BIT(3)) >> 3);
0659     seq_printf(s, "Bit 4 : WiGig controlled by switch:     %lu\n",
0660            (hwswitch_state & BIT(4)) >> 4);
0661     seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
0662            (hwswitch_state & BIT(7)) >> 7);
0663     seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
0664            (hwswitch_state & BIT(8)) >> 8);
0665     seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
0666            (hwswitch_state & BIT(15)) >> 15);
0667 
0668     return 0;
0669 }
0670 DEFINE_SHOW_ATTRIBUTE(dell_debugfs);
0671 
0672 static void dell_update_rfkill(struct work_struct *ignored)
0673 {
0674     struct calling_interface_buffer buffer;
0675     int hwswitch = 0;
0676     int status;
0677     int ret;
0678 
0679     dell_fill_request(&buffer, 0, 0, 0, 0);
0680     ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0681     status = buffer.output[1];
0682 
0683     if (ret != 0)
0684         return;
0685 
0686     dell_fill_request(&buffer, 0x2, 0, 0, 0);
0687     ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0688 
0689     if (ret == 0 && (status & BIT(0)))
0690         hwswitch = buffer.output[1];
0691 
0692     if (wifi_rfkill) {
0693         dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
0694         dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
0695     }
0696     if (bluetooth_rfkill) {
0697         dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
0698                         hwswitch);
0699         dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
0700     }
0701     if (wwan_rfkill) {
0702         dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
0703         dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
0704     }
0705 }
0706 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
0707 
0708 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
0709                   struct serio *port)
0710 {
0711     static bool extended;
0712 
0713     if (str & I8042_STR_AUXDATA)
0714         return false;
0715 
0716     if (unlikely(data == 0xe0)) {
0717         extended = true;
0718         return false;
0719     } else if (unlikely(extended)) {
0720         switch (data) {
0721         case 0x8:
0722             schedule_delayed_work(&dell_rfkill_work,
0723                           round_jiffies_relative(HZ / 4));
0724             break;
0725         }
0726         extended = false;
0727     }
0728 
0729     return false;
0730 }
0731 
0732 static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
0733 static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
0734 
0735 static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
0736                       unsigned long action, void *data)
0737 {
0738     schedule_delayed_work(&dell_rfkill_work, 0);
0739     return NOTIFY_OK;
0740 }
0741 
0742 static struct notifier_block dell_laptop_rbtn_notifier = {
0743     .notifier_call = dell_laptop_rbtn_notifier_call,
0744 };
0745 
0746 static int __init dell_setup_rfkill(void)
0747 {
0748     struct calling_interface_buffer buffer;
0749     int status, ret, whitelisted;
0750     const char *product;
0751 
0752     /*
0753      * rfkill support causes trouble on various models, mostly Inspirons.
0754      * So we whitelist certain series, and don't support rfkill on others.
0755      */
0756     whitelisted = 0;
0757     product = dmi_get_system_info(DMI_PRODUCT_NAME);
0758     if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
0759              strncmp(product, "Precision", 9) == 0))
0760         whitelisted = 1;
0761     if (!force_rfkill && !whitelisted)
0762         return 0;
0763 
0764     dell_fill_request(&buffer, 0, 0, 0, 0);
0765     ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
0766     status = buffer.output[1];
0767 
0768     /* dell wireless info smbios call is not supported */
0769     if (ret != 0)
0770         return 0;
0771 
0772     /* rfkill is only tested on laptops with a hwswitch */
0773     if (!(status & BIT(0)) && !force_rfkill)
0774         return 0;
0775 
0776     if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
0777         wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
0778                        RFKILL_TYPE_WLAN,
0779                        &dell_rfkill_ops, (void *) 1);
0780         if (!wifi_rfkill) {
0781             ret = -ENOMEM;
0782             goto err_wifi;
0783         }
0784         ret = rfkill_register(wifi_rfkill);
0785         if (ret)
0786             goto err_wifi;
0787     }
0788 
0789     if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
0790         bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
0791                         &platform_device->dev,
0792                         RFKILL_TYPE_BLUETOOTH,
0793                         &dell_rfkill_ops, (void *) 2);
0794         if (!bluetooth_rfkill) {
0795             ret = -ENOMEM;
0796             goto err_bluetooth;
0797         }
0798         ret = rfkill_register(bluetooth_rfkill);
0799         if (ret)
0800             goto err_bluetooth;
0801     }
0802 
0803     if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
0804         wwan_rfkill = rfkill_alloc("dell-wwan",
0805                        &platform_device->dev,
0806                        RFKILL_TYPE_WWAN,
0807                        &dell_rfkill_ops, (void *) 3);
0808         if (!wwan_rfkill) {
0809             ret = -ENOMEM;
0810             goto err_wwan;
0811         }
0812         ret = rfkill_register(wwan_rfkill);
0813         if (ret)
0814             goto err_wwan;
0815     }
0816 
0817     /*
0818      * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
0819      * which can receive events from HW slider switch.
0820      *
0821      * Dell SMBIOS on whitelisted models supports controlling radio devices
0822      * but does not support receiving HW button switch events. We can use
0823      * i8042 filter hook function to receive keyboard data and handle
0824      * keycode for HW button.
0825      *
0826      * So if it is possible we will use Dell Airplane Mode Switch ACPI
0827      * driver for receiving HW events and Dell SMBIOS for setting rfkill
0828      * states. If ACPI driver or device is not available we will fallback to
0829      * i8042 filter hook function.
0830      *
0831      * To prevent duplicate rfkill devices which control and do same thing,
0832      * dell-rbtn driver will automatically remove its own rfkill devices
0833      * once function dell_rbtn_notifier_register() is called.
0834      */
0835 
0836     dell_rbtn_notifier_register_func =
0837         symbol_request(dell_rbtn_notifier_register);
0838     if (dell_rbtn_notifier_register_func) {
0839         dell_rbtn_notifier_unregister_func =
0840             symbol_request(dell_rbtn_notifier_unregister);
0841         if (!dell_rbtn_notifier_unregister_func) {
0842             symbol_put(dell_rbtn_notifier_register);
0843             dell_rbtn_notifier_register_func = NULL;
0844         }
0845     }
0846 
0847     if (dell_rbtn_notifier_register_func) {
0848         ret = dell_rbtn_notifier_register_func(
0849             &dell_laptop_rbtn_notifier);
0850         symbol_put(dell_rbtn_notifier_register);
0851         dell_rbtn_notifier_register_func = NULL;
0852         if (ret != 0) {
0853             symbol_put(dell_rbtn_notifier_unregister);
0854             dell_rbtn_notifier_unregister_func = NULL;
0855         }
0856     } else {
0857         pr_info("Symbols from dell-rbtn acpi driver are not available\n");
0858         ret = -ENODEV;
0859     }
0860 
0861     if (ret == 0) {
0862         pr_info("Using dell-rbtn acpi driver for receiving events\n");
0863     } else if (ret != -ENODEV) {
0864         pr_warn("Unable to register dell rbtn notifier\n");
0865         goto err_filter;
0866     } else {
0867         ret = i8042_install_filter(dell_laptop_i8042_filter);
0868         if (ret) {
0869             pr_warn("Unable to install key filter\n");
0870             goto err_filter;
0871         }
0872         pr_info("Using i8042 filter function for receiving events\n");
0873     }
0874 
0875     return 0;
0876 err_filter:
0877     if (wwan_rfkill)
0878         rfkill_unregister(wwan_rfkill);
0879 err_wwan:
0880     rfkill_destroy(wwan_rfkill);
0881     if (bluetooth_rfkill)
0882         rfkill_unregister(bluetooth_rfkill);
0883 err_bluetooth:
0884     rfkill_destroy(bluetooth_rfkill);
0885     if (wifi_rfkill)
0886         rfkill_unregister(wifi_rfkill);
0887 err_wifi:
0888     rfkill_destroy(wifi_rfkill);
0889 
0890     return ret;
0891 }
0892 
0893 static void dell_cleanup_rfkill(void)
0894 {
0895     if (dell_rbtn_notifier_unregister_func) {
0896         dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
0897         symbol_put(dell_rbtn_notifier_unregister);
0898         dell_rbtn_notifier_unregister_func = NULL;
0899     } else {
0900         i8042_remove_filter(dell_laptop_i8042_filter);
0901     }
0902     cancel_delayed_work_sync(&dell_rfkill_work);
0903     if (wifi_rfkill) {
0904         rfkill_unregister(wifi_rfkill);
0905         rfkill_destroy(wifi_rfkill);
0906     }
0907     if (bluetooth_rfkill) {
0908         rfkill_unregister(bluetooth_rfkill);
0909         rfkill_destroy(bluetooth_rfkill);
0910     }
0911     if (wwan_rfkill) {
0912         rfkill_unregister(wwan_rfkill);
0913         rfkill_destroy(wwan_rfkill);
0914     }
0915 }
0916 
0917 static int dell_send_intensity(struct backlight_device *bd)
0918 {
0919     struct calling_interface_buffer buffer;
0920     struct calling_interface_token *token;
0921     int ret;
0922 
0923     token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
0924     if (!token)
0925         return -ENODEV;
0926 
0927     dell_fill_request(&buffer,
0928                token->location, bd->props.brightness, 0, 0);
0929     if (power_supply_is_system_supplied() > 0)
0930         ret = dell_send_request(&buffer,
0931                     CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
0932     else
0933         ret = dell_send_request(&buffer,
0934                     CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
0935 
0936     return ret;
0937 }
0938 
0939 static int dell_get_intensity(struct backlight_device *bd)
0940 {
0941     struct calling_interface_buffer buffer;
0942     struct calling_interface_token *token;
0943     int ret;
0944 
0945     token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
0946     if (!token)
0947         return -ENODEV;
0948 
0949     dell_fill_request(&buffer, token->location, 0, 0, 0);
0950     if (power_supply_is_system_supplied() > 0)
0951         ret = dell_send_request(&buffer,
0952                     CLASS_TOKEN_READ, SELECT_TOKEN_AC);
0953     else
0954         ret = dell_send_request(&buffer,
0955                     CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
0956 
0957     if (ret == 0)
0958         ret = buffer.output[1];
0959 
0960     return ret;
0961 }
0962 
0963 static const struct backlight_ops dell_ops = {
0964     .get_brightness = dell_get_intensity,
0965     .update_status  = dell_send_intensity,
0966 };
0967 
0968 static void touchpad_led_on(void)
0969 {
0970     int command = 0x97;
0971     char data = 1;
0972     i8042_command(&data, command | 1 << 12);
0973 }
0974 
0975 static void touchpad_led_off(void)
0976 {
0977     int command = 0x97;
0978     char data = 2;
0979     i8042_command(&data, command | 1 << 12);
0980 }
0981 
0982 static void touchpad_led_set(struct led_classdev *led_cdev,
0983     enum led_brightness value)
0984 {
0985     if (value > 0)
0986         touchpad_led_on();
0987     else
0988         touchpad_led_off();
0989 }
0990 
0991 static struct led_classdev touchpad_led = {
0992     .name = "dell-laptop::touchpad",
0993     .brightness_set = touchpad_led_set,
0994     .flags = LED_CORE_SUSPENDRESUME,
0995 };
0996 
0997 static int __init touchpad_led_init(struct device *dev)
0998 {
0999     return led_classdev_register(dev, &touchpad_led);
1000 }
1001 
1002 static 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 
1134 enum kbd_timeout_unit {
1135     KBD_TIMEOUT_SECONDS = 0,
1136     KBD_TIMEOUT_MINUTES,
1137     KBD_TIMEOUT_HOURS,
1138     KBD_TIMEOUT_DAYS,
1139 };
1140 
1141 enum 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 
1160 struct 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 
1171 struct 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 
1183 static 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 
1192 static u16 kbd_token_bits;
1193 
1194 static struct kbd_info kbd_info;
1195 static bool kbd_als_supported;
1196 static bool kbd_triggers_supported;
1197 static bool kbd_timeout_ac_supported;
1198 
1199 static u8 kbd_mode_levels[16];
1200 static int kbd_mode_levels_count;
1201 
1202 static u8 kbd_previous_level;
1203 static u8 kbd_previous_mode_bit;
1204 
1205 static bool kbd_led_present;
1206 static DEFINE_MUTEX(kbd_led_mutex);
1207 static 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 
1222 static 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 
1255 static 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 
1264 static 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 
1281 static 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 
1308 static 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 
1335 static 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 
1357 static 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 
1377 static 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 
1396 static 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 
1420 static 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 
1434 static int kbd_get_valid_token_counts(void)
1435 {
1436     return hweight16(kbd_token_bits);
1437 }
1438 
1439 static 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 
1522 static 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 
1531 static 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 
1549 static 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;
1661 out:
1662     mutex_unlock(&kbd_led_mutex);
1663     return ret;
1664 }
1665 
1666 static 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 
1705 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1706            kbd_led_timeout_show, kbd_led_timeout_store);
1707 
1708 static const char * const kbd_led_triggers[] = {
1709     "keyboard",
1710     "touchpad",
1711     /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1712     "mouse",
1713 };
1714 
1715 static 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;
1804 out:
1805     mutex_unlock(&kbd_led_mutex);
1806     return ret;
1807 }
1808 
1809 static 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 
1846 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1847            kbd_led_triggers_show, kbd_led_triggers_store);
1848 
1849 static 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;
1903 out:
1904     mutex_unlock(&kbd_led_mutex);
1905     return ret;
1906 }
1907 
1908 static 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 
1924 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1925            kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1926 
1927 static 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;
1954 out:
1955     mutex_unlock(&kbd_led_mutex);
1956     return ret;
1957 }
1958 
1959 static 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 
1973 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1974            kbd_led_als_setting_show, kbd_led_als_setting_store);
1975 
1976 static struct attribute *kbd_led_attrs[] = {
1977     &dev_attr_stop_timeout.attr,
1978     &dev_attr_start_triggers.attr,
1979     NULL,
1980 };
1981 
1982 static const struct attribute_group kbd_led_group = {
1983     .attrs = kbd_led_attrs,
1984 };
1985 
1986 static struct attribute *kbd_led_als_attrs[] = {
1987     &dev_attr_als_enabled.attr,
1988     &dev_attr_als_setting.attr,
1989     NULL,
1990 };
1991 
1992 static const struct attribute_group kbd_led_als_group = {
1993     .attrs = kbd_led_als_attrs,
1994 };
1995 
1996 static const struct attribute_group *kbd_led_groups[] = {
1997     &kbd_led_group,
1998     &kbd_led_als_group,
1999     NULL,
2000 };
2001 
2002 static 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 
2033 static 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 
2065 out:
2066     if (ret == 0)
2067         kbd_led_level = new_value;
2068 
2069     mutex_unlock(&kbd_led_mutex);
2070     return ret;
2071 }
2072 
2073 static 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 
2081 static 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 
2106 static 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 
2112 static 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 
2120 static 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 
2148 static struct notifier_block dell_laptop_notifier = {
2149     .notifier_call = dell_laptop_notifier_call,
2150 };
2151 
2152 static 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 
2173 static 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 
2180 static 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 
2275 fail_get_brightness:
2276     backlight_device_unregister(dell_backlight_device);
2277 fail_backlight:
2278     if (micmute_led_registered)
2279         led_classdev_unregister(&micmute_led_cdev);
2280 fail_led:
2281     dell_cleanup_rfkill();
2282 fail_rfkill:
2283     platform_device_del(platform_device);
2284 fail_platform_device2:
2285     platform_device_put(platform_device);
2286 fail_platform_device1:
2287     platform_driver_unregister(&platform_driver);
2288 fail_platform_driver:
2289     return ret;
2290 }
2291 
2292 static 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  */
2316 late_initcall(dell_init);
2317 module_exit(dell_exit);
2318 
2319 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2320 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2321 MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
2322 MODULE_DESCRIPTION("Dell laptop driver");
2323 MODULE_LICENSE("GPL");
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