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linux-next/drivers/platform/x86/dell-wmi.c
Linus Torvalds 5516745311 platform-drivers-x86 for v5.3-1
ASUS WMI driver got a big refactoring in order to support the TUF Gaming
 laptops. Besides that, the regression with backlight being permanently off
 on various EeePC laptops has been fixed.
 
 Accelerometer on HP ProBook 450 G0 shows wrong measurements due to
 X axis being inverted. This has been fixed.
 
 Intel PMC core driver has been extended to be ACPI enumerated
 if the DSDT provides device with _HID "INT33A1". This allows
 to convert the driver to be pure platform and support new hardware
 purely based on ACPI DSDT.
 
 From now on the Intel Speed Select Technology is supported thru
 a corresponding driver. This driver provides an access to the features
 of the ISST, such as Performance Profile, Core Power, Base frequency and
 Turbo Frequency.
 
 Mellanox platform drivers has been refactored and now extended
 to support more systems, including new coming ones.
 
 The OLPC XO-1.75 platform is now supported.
 
 CB4063 Beckhoff Automation board is using PMC clocks,
 provided via pmc_atom driver, for ethernet controllers in a way
 that they can't be managed by the clock driver. The quirk
 has been extended to cover this case.
 
 Touchscreen on Chuwi Hi10 Plus tablet has been enabled. Meanwhile
 the information of Chuwi Hi10 Air has been fixed to cover more models
 based on the same platform.
 
 Xiaomi notebooks have WMI interface enabled. Thus, the driver to support it
 has been provided. It required some extension of the generic WMI library,
 which allows to propagate opaque context to the ->probe() of the
 individual drivers.
 
 This release includes debugfs clean up from Greg KH for several drivers
 that drop return code check and make debugfs absence or failure non-fatal.
 
 Miscellaneous fixes here and there, mostly for Acer WMI and
 various Intel drivers.
 
 The listed below commits are duplicated due to previously pushed fixes in v5.2 cycle:
 - 1dd93f873d platform/x86: asus-wmi: Only Tell EC the OS will handle display hotkeys from asus_nb_wmi
 - 89ae3a0736 platform/x86: intel-vbtn: Report switch events when event wakes device
 - fa882fc80d platform/x86: mlx-platform: Fix parent device in i2c-mux-reg device registration
 - 0bfcd24b39 platform/mellanox: mlxreg-hotplug: Add devm_free_irq call to remove flow
 
 The following is an automated git shortlog grouped by driver:
 
 acer-wmi:
  -  Mark expected switch fall-throughs
  -  no need to check return value of debugfs_create functions
 
 asus-nb-wmi:
  -  Add microphone mute key code
 
 asus-wmi:
  -  Use dev_get_drvdata()
  -  Do not disable keyboard backlight on unloading
  -  Switch fan boost mode
  -  Enhance detection of thermal data
  -  Organize code into sections
  -  Refactor error handling
  -  Support WMI event queue
  -  Refactor WMI event handling
  -  Improve DSTS WMI method ID detection
  -  Increase input buffer size of WMI methods
  -  Fix preserving keyboard backlight intensity on load
  -  Fix hwmon device cleanup
  -  no need to check return value of debugfs_create functions
  -  Only Tell EC the OS will handle display hotkeys from asus_nb_wmi
 
 dell-laptop:
  -  no need to check return value of debugfs_create functions
 
 hp_accel:
  -  Add support for HP ProBook 450 G0
 
 ideapad-laptop:
  -  no need to check return value of debugfs_create functions
 
 intel_int0002_vgpio:
  -  Get rid of custom ICPU() macro
 
 intel_menlow:
  -  avoid null pointer deference error
 
 intel_pmc:
  -  no need to check return value of debugfs_create functions
 
 intel_pmc_core:
  -  Attach using APCI HID "INT33A1"
  -  transform Pkg C-state residency from TSC ticks into microseconds
 
 intel_telemetry:
  -  no need to check return value of debugfs_create functions
 
 intel-vbtn:
  -  Report switch events when event wakes device
 
 ISST:
  -  Restore state on resume
  -  Add Intel Speed Select PUNIT MSR interface
  -  Add Intel Speed Select mailbox interface via MSRs
  -  Add Intel Speed Select mailbox interface via PCI
  -  Add Intel Speed Select mmio interface
  -  Add IOCTL to Translate Linux logical CPU to PUNIT CPU number
  -  Store per CPU information
  -  Add common API to register and handle ioctls
  -  Update ioctl-number.txt for Intel Speed Select interface
  -  A tool to validate Intel Speed Select commands
  -  Add .gitignore file
 
 MAINTAINERS:
  -  Update for Intel Speed Select Technology
 
 mlx-platform:
  -  Fix error handling in mlxplat_init()
  -  Add more reset cause attributes
  -  Modify DMI matching order
  -  Add regmap structure for the next generation systems
  -  Change API for i2c-mlxcpld driver activation
  -  Move regmap initialization before all drivers activation
  -  Fix parent device in i2c-mux-reg device registration
  -  Add new attribute for mlxreg-io sysfs interfaces
 
 pcengines-apuv2:
  -  Make two symbols static
  -  Fix PCENGINES_APU2 Kconfig warning
 
 OLPC:
  -  Add a config menu category for XO 1.75
  -  Require CONFIG_POWER_SUPPLY for XO-1.75 EC
  -  Fix olpc_xo175_ec_cmd() return value
  -  Make olpc_dt_compatible_match() static __init
  -  Add INPUT dependencies
  -  Fix build error without CONFIG_SPI
  -  Add a regulator for the DCON
  -  Add XO-1.75 EC driver
  -  Use BIT() and GENMASK() for event masks
  -  Avoid a warning if the EC didn't register yet
  -  Move EC-specific functionality out from x86
  -  Remove an unused include
  -  Add OLPC XO-1.75 EC bindings
 
 platform/mellanox:
  -  mlxreg-hotplug: Add devm_free_irq call to remove flow
 
 pmc_atom:
  -  Add CB4063 Beckhoff Automation board to critclk_systems DMI table
  -  no need to check return value of debugfs_create functions
 
 Kconfig:
  - Remove left-over BACKLIGHT_LCD_SUPPORT
 
 samsung-laptop:
  -  no need to check return value of debugfs_create functions
 
 touchscreen_dmi:
  -  Update Hi10 Air filter
  -  Add info for the CHUWI Hi10 Plus tablet.
 
 wmi:
  -  add Xiaomi WMI key driver
  -  add context argument to the probe function
  -  add context pointer field to struct wmi_device_id
  -  Add function to get _UID of WMI device
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Merge tag 'platform-drivers-x86-v5.3-1' of git://git.infradead.org/linux-platform-drivers-x86

Pull x86 platform driver updates from Andy Shevchenko:
 "Gathered a bunch of x86 platform driver changes. It's rather big,
  since includes two big refactors and completely new driver:

   - ASUS WMI driver got a big refactoring in order to support the TUF
     Gaming laptops. Besides that, the regression with backlight being
     permanently off on various EeePC laptops has been fixed.

   - Accelerometer on HP ProBook 450 G0 shows wrong measurements due to
     X axis being inverted. This has been fixed.

   - Intel PMC core driver has been extended to be ACPI enumerated if
     the DSDT provides device with _HID "INT33A1". This allows to
     convert the driver to be pure platform and support new hardware
     purely based on ACPI DSDT.

   - From now on the Intel Speed Select Technology is supported thru a
     corresponding driver. This driver provides an access to the
     features of the ISST, such as Performance Profile, Core Power, Base
     frequency and Turbo Frequency.

   - Mellanox platform drivers has been refactored and now extended to
     support more systems, including new coming ones.

   - The OLPC XO-1.75 platform is now supported.

   - CB4063 Beckhoff Automation board is using PMC clocks, provided via
     pmc_atom driver, for ethernet controllers in a way that they can't
     be managed by the clock driver. The quirk has been extended to
     cover this case.

   - Touchscreen on Chuwi Hi10 Plus tablet has been enabled. Meanwhile
     the information of Chuwi Hi10 Air has been fixed to cover more
     models based on the same platform.

   - Xiaomi notebooks have WMI interface enabled. Thus, the driver to
     support it has been provided. It required some extension of the
     generic WMI library, which allows to propagate opaque context to
     the ->probe() of the individual drivers.

  This release includes debugfs clean up from Greg KH for several
  drivers that drop return code check and make debugfs absence or
  failure non-fatal.

  Also miscellaneous fixes here and there, mostly for Acer WMI and
  various Intel drivers"

* tag 'platform-drivers-x86-v5.3-1' of git://git.infradead.org/linux-platform-drivers-x86: (74 commits)
  platform/x86: Fix PCENGINES_APU2 Kconfig warning
  tools/power/x86/intel-speed-select: Add .gitignore file
  platform/x86: mlx-platform: Fix error handling in mlxplat_init()
  platform/x86: intel_pmc_core: Attach using APCI HID "INT33A1"
  platform/x86: intel_pmc_core: transform Pkg C-state residency from TSC ticks into microseconds
  platform/x86: asus-wmi: Use dev_get_drvdata()
  Documentation/ABI: Add new attribute for mlxreg-io sysfs interfaces
  platform/x86: mlx-platform: Add more reset cause attributes
  platform/x86: mlx-platform: Modify DMI matching order
  platform/x86: mlx-platform: Add regmap structure for the next generation systems
  platform/x86: mlx-platform: Change API for i2c-mlxcpld driver activation
  platform/x86: mlx-platform: Move regmap initialization before all drivers activation
  MAINTAINERS: Update for Intel Speed Select Technology
  tools/power/x86: A tool to validate Intel Speed Select commands
  platform/x86: ISST: Restore state on resume
  platform/x86: ISST: Add Intel Speed Select PUNIT MSR interface
  platform/x86: ISST: Add Intel Speed Select mailbox interface via MSRs
  platform/x86: ISST: Add Intel Speed Select mailbox interface via PCI
  platform/x86: ISST: Add Intel Speed Select mmio interface
  platform/x86: ISST: Add IOCTL to Translate Linux logical CPU to PUNIT CPU number
  ...
2019-07-14 16:51:47 -07:00

731 lines
19 KiB
C

// 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.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>
*/
#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;
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 } },
/* Keyboard backlight change notification */
{ KE_IGNORE, 0x3f, { 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, 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 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);
MODULE_DEVICE_TABLE(wmi, dell_wmi_id_table);