diff options
Diffstat (limited to 'drivers/platform/x86/dell/dell-wmi-base.c')
| -rw-r--r-- | drivers/platform/x86/dell/dell-wmi-base.c | 837 |
1 files changed, 837 insertions, 0 deletions
diff --git a/drivers/platform/x86/dell/dell-wmi-base.c b/drivers/platform/x86/dell/dell-wmi-base.c new file mode 100644 index 000000000..502783a7a --- /dev/null +++ b/drivers/platform/x86/dell/dell-wmi-base.c @@ -0,0 +1,837 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Dell WMI hotkeys + * + * Copyright (C) 2008 Red Hat <mjg@redhat.com> + * Copyright (C) 2014-2015 Pali Rohár <pali@kernel.org> + * + * Portions based on wistron_btns.c: + * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz> + * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org> + * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru> + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/input.h> +#include <linux/input/sparse-keymap.h> +#include <linux/acpi.h> +#include <linux/string.h> +#include <linux/dmi.h> +#include <linux/wmi.h> +#include <acpi/video.h> +#include "dell-smbios.h" +#include "dell-wmi-descriptor.h" +#include "dell-wmi-privacy.h" + +MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); +MODULE_AUTHOR("Pali Rohár <pali@kernel.org>"); +MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver"); +MODULE_LICENSE("GPL"); + +#define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492" + +static bool wmi_requires_smbios_request; + +struct dell_wmi_priv { + struct input_dev *input_dev; + struct input_dev *tabletswitch_dev; + u32 interface_version; +}; + +static int __init dmi_matched(const struct dmi_system_id *dmi) +{ + wmi_requires_smbios_request = 1; + return 1; +} + +static const struct dmi_system_id dell_wmi_smbios_list[] __initconst = { + { + .callback = dmi_matched, + .ident = "Dell Inspiron M5110", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"), + }, + }, + { + .callback = dmi_matched, + .ident = "Dell Vostro V131", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), + }, + }, + { } +}; + +/* + * Keymap for WMI events of type 0x0000 + * + * Certain keys are flagged as KE_IGNORE. All of these are either + * notifications (rather than requests for change) or are also sent + * via the keyboard controller so should not be sent again. + */ +static const struct key_entry dell_wmi_keymap_type_0000[] = { + { KE_IGNORE, 0x003a, { KEY_CAPSLOCK } }, + + /* Key code is followed by brightness level */ + { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } }, + { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } }, + + /* Battery health status button */ + { KE_KEY, 0xe007, { KEY_BATTERY } }, + + /* Radio devices state change, key code is followed by other values */ + { KE_IGNORE, 0xe008, { KEY_RFKILL } }, + + { KE_KEY, 0xe009, { KEY_EJECTCD } }, + + /* Key code is followed by: next, active and attached devices */ + { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } }, + + /* Key code is followed by keyboard illumination level */ + { KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } }, + + /* BIOS error detected */ + { KE_IGNORE, 0xe00d, { KEY_RESERVED } }, + + /* Battery was removed or inserted */ + { KE_IGNORE, 0xe00e, { KEY_RESERVED } }, + + /* Wifi Catcher */ + { KE_KEY, 0xe011, { KEY_WLAN } }, + + /* Ambient light sensor toggle */ + { KE_IGNORE, 0xe013, { KEY_RESERVED } }, + + { KE_IGNORE, 0xe020, { KEY_MUTE } }, + + /* Unknown, defined in ACPI DSDT */ + /* { KE_IGNORE, 0xe023, { KEY_RESERVED } }, */ + + /* Untested, Dell Instant Launch key on Inspiron 7520 */ + /* { KE_IGNORE, 0xe024, { KEY_RESERVED } }, */ + + /* Dell Instant Launch key */ + { KE_KEY, 0xe025, { KEY_PROG4 } }, + + /* Audio panel key */ + { KE_IGNORE, 0xe026, { KEY_RESERVED } }, + + /* LCD Display On/Off Control key */ + { KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } }, + + /* Untested, Multimedia key on Dell Vostro 3560 */ + /* { KE_IGNORE, 0xe028, { KEY_RESERVED } }, */ + + /* Dell Instant Launch key */ + { KE_KEY, 0xe029, { KEY_PROG4 } }, + + /* Untested, Windows Mobility Center button on Inspiron 7520 */ + /* { KE_IGNORE, 0xe02a, { KEY_RESERVED } }, */ + + /* Unknown, defined in ACPI DSDT */ + /* { KE_IGNORE, 0xe02b, { KEY_RESERVED } }, */ + + /* Untested, Dell Audio With Preset Switch button on Inspiron 7520 */ + /* { KE_IGNORE, 0xe02c, { KEY_RESERVED } }, */ + + { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } }, + { KE_IGNORE, 0xe030, { KEY_VOLUMEUP } }, + { KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } }, + { KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } }, + { KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } }, + + /* NIC Link is Up */ + { KE_IGNORE, 0xe043, { KEY_RESERVED } }, + + /* NIC Link is Down */ + { KE_IGNORE, 0xe044, { KEY_RESERVED } }, + + /* + * This entry is very suspicious! + * Originally Matthew Garrett created this dell-wmi driver specially for + * "button with a picture of a battery" which has event code 0xe045. + * Later Mario Limonciello from Dell told us that event code 0xe045 is + * reported by Num Lock and should be ignored because key is send also + * by keyboard controller. + * So for now we will ignore this event to prevent potential double + * Num Lock key press. + */ + { KE_IGNORE, 0xe045, { KEY_NUMLOCK } }, + + /* Scroll lock and also going to tablet mode on portable devices */ + { KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } }, + + /* Untested, going from tablet mode on portable devices */ + /* { KE_IGNORE, 0xe047, { KEY_RESERVED } }, */ + + /* Dell Support Center key */ + { KE_IGNORE, 0xe06e, { KEY_RESERVED } }, + + { KE_IGNORE, 0xe0f7, { KEY_MUTE } }, + { KE_IGNORE, 0xe0f8, { KEY_VOLUMEDOWN } }, + { KE_IGNORE, 0xe0f9, { KEY_VOLUMEUP } }, +}; + +struct dell_bios_keymap_entry { + u16 scancode; + u16 keycode; +}; + +struct dell_bios_hotkey_table { + struct dmi_header header; + struct dell_bios_keymap_entry keymap[]; + +}; + +struct dell_dmi_results { + int err; + int keymap_size; + struct key_entry *keymap; +}; + +/* Uninitialized entries here are KEY_RESERVED == 0. */ +static const u16 bios_to_linux_keycode[256] = { + [0] = KEY_MEDIA, + [1] = KEY_NEXTSONG, + [2] = KEY_PLAYPAUSE, + [3] = KEY_PREVIOUSSONG, + [4] = KEY_STOPCD, + [5] = KEY_UNKNOWN, + [6] = KEY_UNKNOWN, + [7] = KEY_UNKNOWN, + [8] = KEY_WWW, + [9] = KEY_UNKNOWN, + [10] = KEY_VOLUMEDOWN, + [11] = KEY_MUTE, + [12] = KEY_VOLUMEUP, + [13] = KEY_UNKNOWN, + [14] = KEY_BATTERY, + [15] = KEY_EJECTCD, + [16] = KEY_UNKNOWN, + [17] = KEY_SLEEP, + [18] = KEY_PROG1, + [19] = KEY_BRIGHTNESSDOWN, + [20] = KEY_BRIGHTNESSUP, + [21] = KEY_BRIGHTNESS_AUTO, + [22] = KEY_KBDILLUMTOGGLE, + [23] = KEY_UNKNOWN, + [24] = KEY_SWITCHVIDEOMODE, + [25] = KEY_UNKNOWN, + [26] = KEY_UNKNOWN, + [27] = KEY_SWITCHVIDEOMODE, + [28] = KEY_UNKNOWN, + [29] = KEY_UNKNOWN, + [30] = KEY_PROG2, + [31] = KEY_UNKNOWN, + [32] = KEY_UNKNOWN, + [33] = KEY_UNKNOWN, + [34] = KEY_UNKNOWN, + [35] = KEY_UNKNOWN, + [36] = KEY_UNKNOWN, + [37] = KEY_UNKNOWN, + [38] = KEY_MICMUTE, + [255] = KEY_PROG3, +}; + +/* + * Keymap for WMI events of type 0x0010 + * + * These are applied if the 0xB2 DMI hotkey table is present and doesn't + * override them. + */ +static const struct key_entry dell_wmi_keymap_type_0010[] = { + /* Fn-lock switched to function keys */ + { KE_IGNORE, 0x0, { KEY_RESERVED } }, + + /* Fn-lock switched to multimedia keys */ + { KE_IGNORE, 0x1, { KEY_RESERVED } }, + + /* Keyboard backlight change notification */ + { KE_IGNORE, 0x3f, { KEY_RESERVED } }, + + /* Backlight brightness level */ + { KE_KEY, 0x57, { KEY_BRIGHTNESSDOWN } }, + { KE_KEY, 0x58, { KEY_BRIGHTNESSUP } }, + + /*Speaker Mute*/ + { KE_KEY, 0x109, { KEY_MUTE} }, + + /* Mic mute */ + { KE_KEY, 0x150, { KEY_MICMUTE } }, + + /* Fn-lock */ + { KE_IGNORE, 0x151, { KEY_RESERVED } }, + + /* Change keyboard illumination */ + { KE_IGNORE, 0x152, { KEY_KBDILLUMTOGGLE } }, + + /* + * Radio disable (notify only -- there is no model for which the + * WMI event is supposed to trigger an action). + */ + { KE_IGNORE, 0x153, { KEY_RFKILL } }, + + /* RGB keyboard backlight control */ + { KE_IGNORE, 0x154, { KEY_RESERVED } }, + + /* + * Stealth mode toggle. This will "disable all lights and sounds". + * The action is performed by the BIOS and EC; the WMI event is just + * a notification. On the XPS 13 9350, this is Fn+F7, and there's + * a BIOS setting to enable and disable the hotkey. + */ + { KE_IGNORE, 0x155, { KEY_RESERVED } }, + + /* Rugged magnetic dock attach/detach events */ + { KE_IGNORE, 0x156, { KEY_RESERVED } }, + { KE_IGNORE, 0x157, { KEY_RESERVED } }, + + /* Rugged programmable (P1/P2/P3 keys) */ + { KE_KEY, 0x850, { KEY_PROG1 } }, + { KE_KEY, 0x851, { KEY_PROG2 } }, + { KE_KEY, 0x852, { KEY_PROG3 } }, + + /* + * Radio disable (notify only -- there is no model for which the + * WMI event is supposed to trigger an action). + */ + { KE_IGNORE, 0xe008, { KEY_RFKILL } }, + + /* Fn-lock */ + { KE_IGNORE, 0xe035, { KEY_RESERVED } }, +}; + +/* + * Keymap for WMI events of type 0x0011 + */ +static const struct key_entry dell_wmi_keymap_type_0011[] = { + /* Reflex keyboard switch on 2n1 devices */ + { KE_IGNORE, 0xe070, { KEY_RESERVED } }, + + /* Battery unplugged */ + { KE_IGNORE, 0xfff0, { KEY_RESERVED } }, + + /* Battery inserted */ + { KE_IGNORE, 0xfff1, { KEY_RESERVED } }, + + /* + * Detachable keyboard detached / undocked + * Note SW_TABLET_MODE is already reported through the intel_vbtn + * driver for this, so we ignore it. + */ + { KE_IGNORE, 0xfff2, { KEY_RESERVED } }, + + /* Detachable keyboard attached / docked */ + { KE_IGNORE, 0xfff3, { KEY_RESERVED } }, + + /* Keyboard backlight level changed */ + { KE_IGNORE, KBD_LED_OFF_TOKEN, { KEY_RESERVED } }, + { KE_IGNORE, KBD_LED_ON_TOKEN, { KEY_RESERVED } }, + { KE_IGNORE, KBD_LED_AUTO_TOKEN, { KEY_RESERVED } }, + { KE_IGNORE, KBD_LED_AUTO_25_TOKEN, { KEY_RESERVED } }, + { KE_IGNORE, KBD_LED_AUTO_50_TOKEN, { KEY_RESERVED } }, + { KE_IGNORE, KBD_LED_AUTO_75_TOKEN, { KEY_RESERVED } }, + { KE_IGNORE, KBD_LED_AUTO_100_TOKEN, { KEY_RESERVED } }, +}; + +/* + * Keymap for WMI events of type 0x0012 + * They are events with extended data + */ +static const struct key_entry dell_wmi_keymap_type_0012[] = { + /* Backlight brightness change event */ + { KE_IGNORE, 0x0003, { KEY_RESERVED } }, + + /* Ultra-performance mode switch request */ + { KE_IGNORE, 0x000d, { KEY_RESERVED } }, + + /* Fn-lock button pressed */ + { KE_IGNORE, 0xe035, { KEY_RESERVED } }, +}; + +static void dell_wmi_switch_event(struct input_dev **subdev, + const char *devname, + int switchid, + int value) +{ + if (!*subdev) { + struct input_dev *dev = input_allocate_device(); + + if (!dev) { + pr_warn("could not allocate device for %s\n", devname); + return; + } + __set_bit(EV_SW, (dev)->evbit); + __set_bit(switchid, (dev)->swbit); + + (dev)->name = devname; + (dev)->id.bustype = BUS_HOST; + if (input_register_device(dev)) { + input_free_device(dev); + pr_warn("could not register device for %s\n", devname); + return; + } + *subdev = dev; + } + + input_report_switch(*subdev, switchid, value); + input_sync(*subdev); +} + +static int dell_wmi_process_key(struct wmi_device *wdev, int type, int code, u16 *buffer, int remaining) +{ + struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev); + const struct key_entry *key; + int used = 0; + int value = 1; + + key = sparse_keymap_entry_from_scancode(priv->input_dev, + (type << 16) | code); + if (!key) { + pr_info("Unknown key with type 0x%04x and code 0x%04x pressed\n", + type, code); + return 0; + } + + pr_debug("Key with type 0x%04x and code 0x%04x pressed\n", type, code); + + /* Don't report brightness notifications that will also come via ACPI */ + if ((key->keycode == KEY_BRIGHTNESSUP || + key->keycode == KEY_BRIGHTNESSDOWN) && + acpi_video_handles_brightness_key_presses()) + return 0; + + if (type == 0x0000 && code == 0xe025 && !wmi_requires_smbios_request) + return 0; + + if (key->keycode == KEY_KBDILLUMTOGGLE) { + dell_laptop_call_notifier( + DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED, NULL); + } else if (type == 0x0011 && code == 0xe070 && remaining > 0) { + dell_wmi_switch_event(&priv->tabletswitch_dev, + "Dell tablet mode switch", + SW_TABLET_MODE, !buffer[0]); + return 1; + } else if (type == 0x0012 && code == 0x000d && remaining > 0) { + value = (buffer[2] == 2); + used = 1; + } + + sparse_keymap_report_entry(priv->input_dev, key, value, true); + + return used; +} + +static void dell_wmi_notify(struct wmi_device *wdev, + union acpi_object *obj) +{ + struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev); + u16 *buffer_entry, *buffer_end; + acpi_size buffer_size; + int len, i; + + if (obj->type != ACPI_TYPE_BUFFER) { + pr_warn("bad response type %x\n", obj->type); + return; + } + + pr_debug("Received WMI event (%*ph)\n", + obj->buffer.length, obj->buffer.pointer); + + buffer_entry = (u16 *)obj->buffer.pointer; + buffer_size = obj->buffer.length/2; + buffer_end = buffer_entry + buffer_size; + + /* + * BIOS/ACPI on devices with WMI interface version 0 does not clear + * buffer before filling it. So next time when BIOS/ACPI send WMI event + * which is smaller as previous then it contains garbage in buffer from + * previous event. + * + * BIOS/ACPI on devices with WMI interface version 1 clears buffer and + * sometimes send more events in buffer at one call. + * + * So to prevent reading garbage from buffer we will process only first + * one event on devices with WMI interface version 0. + */ + if (priv->interface_version == 0 && buffer_entry < buffer_end) + if (buffer_end > buffer_entry + buffer_entry[0] + 1) + buffer_end = buffer_entry + buffer_entry[0] + 1; + + while (buffer_entry < buffer_end) { + + len = buffer_entry[0]; + if (len == 0) + break; + + len++; + + if (buffer_entry + len > buffer_end) { + pr_warn("Invalid length of WMI event\n"); + break; + } + + pr_debug("Process buffer (%*ph)\n", len*2, buffer_entry); + + switch (buffer_entry[1]) { + case 0x0000: /* One key pressed or event occurred */ + if (len > 2) + dell_wmi_process_key(wdev, buffer_entry[1], + buffer_entry[2], + buffer_entry + 3, + len - 3); + /* Extended data is currently ignored */ + break; + case 0x0010: /* Sequence of keys pressed */ + case 0x0011: /* Sequence of events occurred */ + for (i = 2; i < len; ++i) + i += dell_wmi_process_key(wdev, buffer_entry[1], + buffer_entry[i], + buffer_entry + i, + len - i - 1); + break; + case 0x0012: + if ((len > 4) && dell_privacy_process_event(buffer_entry[1], buffer_entry[3], + buffer_entry[4])) + /* dell_privacy_process_event has handled the event */; + else if (len > 2) + dell_wmi_process_key(wdev, buffer_entry[1], buffer_entry[2], + buffer_entry + 3, len - 3); + break; + default: /* Unknown event */ + pr_info("Unknown WMI event type 0x%x\n", + (int)buffer_entry[1]); + break; + } + + buffer_entry += len; + + } + +} + +static bool have_scancode(u32 scancode, const struct key_entry *keymap, int len) +{ + int i; + + for (i = 0; i < len; i++) + if (keymap[i].code == scancode) + return true; + + return false; +} + +static void handle_dmi_entry(const struct dmi_header *dm, void *opaque) +{ + struct dell_dmi_results *results = opaque; + struct dell_bios_hotkey_table *table; + int hotkey_num, i, pos = 0; + struct key_entry *keymap; + + if (results->err || results->keymap) + return; /* We already found the hotkey table. */ + + /* The Dell hotkey table is type 0xB2. Scan until we find it. */ + if (dm->type != 0xb2) + return; + + table = container_of(dm, struct dell_bios_hotkey_table, header); + + hotkey_num = (table->header.length - + sizeof(struct dell_bios_hotkey_table)) / + sizeof(struct dell_bios_keymap_entry); + if (hotkey_num < 1) { + /* + * Historically, dell-wmi would ignore a DMI entry of + * fewer than 7 bytes. Sizes between 4 and 8 bytes are + * nonsensical (both the header and all entries are 4 + * bytes), so we approximate the old behavior by + * ignoring tables with fewer than one entry. + */ + return; + } + + keymap = kcalloc(hotkey_num, sizeof(struct key_entry), GFP_KERNEL); + if (!keymap) { + results->err = -ENOMEM; + return; + } + + for (i = 0; i < hotkey_num; i++) { + const struct dell_bios_keymap_entry *bios_entry = + &table->keymap[i]; + + /* Uninitialized entries are 0 aka KEY_RESERVED. */ + u16 keycode = (bios_entry->keycode < + ARRAY_SIZE(bios_to_linux_keycode)) ? + bios_to_linux_keycode[bios_entry->keycode] : + (bios_entry->keycode == 0xffff ? KEY_UNKNOWN : KEY_RESERVED); + + /* + * Log if we find an entry in the DMI table that we don't + * understand. If this happens, we should figure out what + * the entry means and add it to bios_to_linux_keycode. + */ + if (keycode == KEY_RESERVED) { + pr_info("firmware scancode 0x%x maps to unrecognized keycode 0x%x\n", + bios_entry->scancode, bios_entry->keycode); + continue; + } + + if (keycode == KEY_KBDILLUMTOGGLE) + keymap[pos].type = KE_IGNORE; + else + keymap[pos].type = KE_KEY; + keymap[pos].code = bios_entry->scancode; + keymap[pos].keycode = keycode; + + pos++; + } + + results->keymap = keymap; + results->keymap_size = pos; +} + +static int dell_wmi_input_setup(struct wmi_device *wdev) +{ + struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev); + struct dell_dmi_results dmi_results = {}; + struct key_entry *keymap; + int err, i, pos = 0; + + priv->input_dev = input_allocate_device(); + if (!priv->input_dev) + return -ENOMEM; + + priv->input_dev->name = "Dell WMI hotkeys"; + priv->input_dev->id.bustype = BUS_HOST; + priv->input_dev->dev.parent = &wdev->dev; + + if (dmi_walk(handle_dmi_entry, &dmi_results)) { + /* + * Historically, dell-wmi ignored dmi_walk errors. A failure + * is certainly surprising, but it probably just indicates + * a very old laptop. + */ + pr_warn("no DMI; using the old-style hotkey interface\n"); + } + + if (dmi_results.err) { + err = dmi_results.err; + goto err_free_dev; + } + + keymap = kcalloc(dmi_results.keymap_size + + ARRAY_SIZE(dell_wmi_keymap_type_0000) + + ARRAY_SIZE(dell_wmi_keymap_type_0010) + + ARRAY_SIZE(dell_wmi_keymap_type_0011) + + ARRAY_SIZE(dell_wmi_keymap_type_0012) + + 1, + sizeof(struct key_entry), GFP_KERNEL); + if (!keymap) { + kfree(dmi_results.keymap); + err = -ENOMEM; + goto err_free_dev; + } + + /* Append table with events of type 0x0010 which comes from DMI */ + for (i = 0; i < dmi_results.keymap_size; i++) { + keymap[pos] = dmi_results.keymap[i]; + keymap[pos].code |= (0x0010 << 16); + pos++; + } + + kfree(dmi_results.keymap); + + /* Append table with extra events of type 0x0010 which are not in DMI */ + for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0010); i++) { + const struct key_entry *entry = &dell_wmi_keymap_type_0010[i]; + + /* + * Check if we've already found this scancode. This takes + * quadratic time, but it doesn't matter unless the list + * of extra keys gets very long. + */ + if (dmi_results.keymap_size && + have_scancode(entry->code | (0x0010 << 16), + keymap, dmi_results.keymap_size) + ) + continue; + + keymap[pos] = *entry; + keymap[pos].code |= (0x0010 << 16); + pos++; + } + + /* Append table with events of type 0x0011 */ + for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0011); i++) { + keymap[pos] = dell_wmi_keymap_type_0011[i]; + keymap[pos].code |= (0x0011 << 16); + pos++; + } + + /* Append table with events of type 0x0012 */ + for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0012); i++) { + keymap[pos] = dell_wmi_keymap_type_0012[i]; + keymap[pos].code |= (0x0012 << 16); + pos++; + } + + /* + * Now append also table with "legacy" events of type 0x0000. Some of + * them are reported also on laptops which have scancodes in DMI. + */ + for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0000); i++) { + keymap[pos] = dell_wmi_keymap_type_0000[i]; + pos++; + } + + keymap[pos].type = KE_END; + + err = sparse_keymap_setup(priv->input_dev, keymap, NULL); + /* + * Sparse keymap library makes a copy of keymap so we don't need the + * original one that was allocated. + */ + kfree(keymap); + if (err) + goto err_free_dev; + + err = input_register_device(priv->input_dev); + if (err) + goto err_free_dev; + + return 0; + + err_free_dev: + input_free_device(priv->input_dev); + return err; +} + +static void dell_wmi_input_destroy(struct wmi_device *wdev) +{ + struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev); + + input_unregister_device(priv->input_dev); + if (priv->tabletswitch_dev) + input_unregister_device(priv->tabletswitch_dev); +} + +/* + * According to Dell SMBIOS documentation: + * + * 17 3 Application Program Registration + * + * cbArg1 Application ID 1 = 0x00010000 + * cbArg2 Application ID 2 + * QUICKSET/DCP = 0x51534554 "QSET" + * ALS Driver = 0x416c7353 "AlsS" + * Latitude ON = 0x4c6f6e52 "LonR" + * cbArg3 Application version or revision number + * cbArg4 0 = Unregister application + * 1 = Register application + * cbRes1 Standard return codes (0, -1, -2) + */ + +static int dell_wmi_events_set_enabled(bool enable) +{ + struct calling_interface_buffer *buffer; + int ret; + + buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL); + if (!buffer) + return -ENOMEM; + buffer->cmd_class = CLASS_INFO; + buffer->cmd_select = SELECT_APP_REGISTRATION; + buffer->input[0] = 0x10000; + buffer->input[1] = 0x51534554; + buffer->input[3] = enable; + ret = dell_smbios_call(buffer); + if (ret == 0) + ret = buffer->output[0]; + kfree(buffer); + + return dell_smbios_error(ret); +} + +static int dell_wmi_probe(struct wmi_device *wdev, const void *context) +{ + struct dell_wmi_priv *priv; + int ret; + + ret = dell_wmi_get_descriptor_valid(); + if (ret) + return ret; + + priv = devm_kzalloc( + &wdev->dev, sizeof(struct dell_wmi_priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + dev_set_drvdata(&wdev->dev, priv); + + if (!dell_wmi_get_interface_version(&priv->interface_version)) + return -EPROBE_DEFER; + + return dell_wmi_input_setup(wdev); +} + +static void dell_wmi_remove(struct wmi_device *wdev) +{ + dell_wmi_input_destroy(wdev); +} +static const struct wmi_device_id dell_wmi_id_table[] = { + { .guid_string = DELL_EVENT_GUID }, + { }, +}; + +static struct wmi_driver dell_wmi_driver = { + .driver = { + .name = "dell-wmi", + }, + .id_table = dell_wmi_id_table, + .probe = dell_wmi_probe, + .remove = dell_wmi_remove, + .notify = dell_wmi_notify, +}; + +static int __init dell_wmi_init(void) +{ + int err; + + dmi_check_system(dell_wmi_smbios_list); + + if (wmi_requires_smbios_request) { + err = dell_wmi_events_set_enabled(true); + if (err) { + pr_err("Failed to enable WMI events\n"); + return err; + } + } + + err = dell_privacy_register_driver(); + if (err) + return err; + + return wmi_driver_register(&dell_wmi_driver); +} +late_initcall(dell_wmi_init); + +static void __exit dell_wmi_exit(void) +{ + if (wmi_requires_smbios_request) + dell_wmi_events_set_enabled(false); + + wmi_driver_unregister(&dell_wmi_driver); + dell_privacy_unregister_driver(); +} +module_exit(dell_wmi_exit); + +MODULE_DEVICE_TABLE(wmi, dell_wmi_id_table); |