v4.19.13 snapshot.
diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
new file mode 100644
index 0000000..16c7f3d
--- /dev/null
+++ b/drivers/platform/x86/dell-wmi.c
@@ -0,0 +1,740 @@
+/*
+ * Dell WMI hotkeys
+ *
+ * Copyright (C) 2008 Red Hat <mjg@redhat.com>
+ * Copyright (C) 2014-2015 Pali Rohár <pali.rohar@gmail.com>
+ *
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#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"
+
+MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
+MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
+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;
+
+MODULE_ALIAS("wmi:"DELL_EVENT_GUID);
+
+struct dell_wmi_priv {
+ struct input_dev *input_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 } },
+
+ /* 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[] = {
+ /* Battery unplugged */
+ { KE_IGNORE, 0xfff0, { KEY_RESERVED } },
+
+ /* Battery inserted */
+ { KE_IGNORE, 0xfff1, { KEY_RESERVED } },
+
+ /* Keyboard backlight level changed */
+ { KE_IGNORE, 0x01e1, { KEY_RESERVED } },
+ { KE_IGNORE, 0x02ea, { KEY_RESERVED } },
+ { KE_IGNORE, 0x02eb, { KEY_RESERVED } },
+ { KE_IGNORE, 0x02ec, { KEY_RESERVED } },
+ { KE_IGNORE, 0x02f6, { KEY_RESERVED } },
+};
+
+static void dell_wmi_process_key(struct wmi_device *wdev, int type, int code)
+{
+ struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
+ const struct key_entry *key;
+
+ 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;
+ }
+
+ 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;
+
+ if (type == 0x0000 && code == 0xe025 && !wmi_requires_smbios_request)
+ return;
+
+ if (key->keycode == KEY_KBDILLUMTOGGLE)
+ dell_laptop_call_notifier(
+ DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED, NULL);
+
+ sparse_keymap_report_entry(priv->input_dev, key, 1, true);
+}
+
+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, 0x0000,
+ buffer_entry[2]);
+ /* Other entries could contain additional information */
+ break;
+ case 0x0010: /* Sequence of keys pressed */
+ case 0x0011: /* Sequence of events occurred */
+ for (i = 2; i < len; ++i)
+ dell_wmi_process_key(wdev, buffer_entry[1],
+ buffer_entry[i]);
+ 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] :
+ 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) +
+ 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++;
+ }
+
+ /*
+ * 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);
+}
+
+/*
+ * 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)
+{
+ 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 int dell_wmi_remove(struct wmi_device *wdev)
+{
+ dell_wmi_input_destroy(wdev);
+ return 0;
+}
+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;
+ }
+ }
+
+ 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);
+}
+module_exit(dell_wmi_exit);