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![Hans de Goede](/assets/img/avatar_default.png)
Explicitly check the status rather then relying on output.pointer staying NULL on an error. Reported-by: Maximilian Luz <luzmaximilian@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20210204121931.131617-1-hdegoede@redhat.com
347 lines
8.5 KiB
C
347 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* MSI WMI hotkeys
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*
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* Copyright (C) 2009 Novell <trenn@suse.de>
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*
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* Most stuff taken over from hp-wmi
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/input.h>
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#include <linux/input/sparse-keymap.h>
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#include <linux/acpi.h>
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#include <linux/backlight.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <acpi/video.h>
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MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
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MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
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MODULE_LICENSE("GPL");
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#define DRV_NAME "msi-wmi"
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#define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
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#define MSIWMI_MSI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
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#define MSIWMI_WIND_EVENT_GUID "5B3CC38A-40D9-7245-8AE6-1145B751BE3F"
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MODULE_ALIAS("wmi:" MSIWMI_BIOS_GUID);
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MODULE_ALIAS("wmi:" MSIWMI_MSI_EVENT_GUID);
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MODULE_ALIAS("wmi:" MSIWMI_WIND_EVENT_GUID);
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enum msi_scancodes {
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/* Generic MSI keys (not present on MSI Wind) */
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MSI_KEY_BRIGHTNESSUP = 0xD0,
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MSI_KEY_BRIGHTNESSDOWN,
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MSI_KEY_VOLUMEUP,
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MSI_KEY_VOLUMEDOWN,
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MSI_KEY_MUTE,
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/* MSI Wind keys */
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WIND_KEY_TOUCHPAD = 0x08, /* Fn+F3 touchpad toggle */
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WIND_KEY_BLUETOOTH = 0x56, /* Fn+F11 Bluetooth toggle */
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WIND_KEY_CAMERA, /* Fn+F6 webcam toggle */
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WIND_KEY_WLAN = 0x5f, /* Fn+F11 Wi-Fi toggle */
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WIND_KEY_TURBO, /* Fn+F10 turbo mode toggle */
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WIND_KEY_ECO = 0x69, /* Fn+F10 ECO mode toggle */
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};
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static struct key_entry msi_wmi_keymap[] = {
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{ KE_KEY, MSI_KEY_BRIGHTNESSUP, {KEY_BRIGHTNESSUP} },
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{ KE_KEY, MSI_KEY_BRIGHTNESSDOWN, {KEY_BRIGHTNESSDOWN} },
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{ KE_KEY, MSI_KEY_VOLUMEUP, {KEY_VOLUMEUP} },
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{ KE_KEY, MSI_KEY_VOLUMEDOWN, {KEY_VOLUMEDOWN} },
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{ KE_KEY, MSI_KEY_MUTE, {KEY_MUTE} },
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/* These keys work without WMI. Ignore them to avoid double keycodes */
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{ KE_IGNORE, WIND_KEY_TOUCHPAD, {KEY_TOUCHPAD_TOGGLE} },
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{ KE_IGNORE, WIND_KEY_BLUETOOTH, {KEY_BLUETOOTH} },
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{ KE_IGNORE, WIND_KEY_CAMERA, {KEY_CAMERA} },
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{ KE_IGNORE, WIND_KEY_WLAN, {KEY_WLAN} },
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/* These are unknown WMI events found on MSI Wind */
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{ KE_IGNORE, 0x00 },
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{ KE_IGNORE, 0x62 },
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{ KE_IGNORE, 0x63 },
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/* These are MSI Wind keys that should be handled via WMI */
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{ KE_KEY, WIND_KEY_TURBO, {KEY_PROG1} },
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{ KE_KEY, WIND_KEY_ECO, {KEY_PROG2} },
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{ KE_END, 0 }
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};
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static ktime_t last_pressed;
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static const struct {
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const char *guid;
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bool quirk_last_pressed;
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} *event_wmi, event_wmis[] = {
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{ MSIWMI_MSI_EVENT_GUID, true },
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{ MSIWMI_WIND_EVENT_GUID, false },
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};
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static struct backlight_device *backlight;
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static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
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static struct input_dev *msi_wmi_input_dev;
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static int msi_wmi_query_block(int instance, int *ret)
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{
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acpi_status status;
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union acpi_object *obj;
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
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if (ACPI_FAILURE(status))
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return -EIO;
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obj = output.pointer;
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if (!obj || obj->type != ACPI_TYPE_INTEGER) {
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if (obj) {
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pr_err("query block returned object "
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"type: %d - buffer length:%d\n", obj->type,
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obj->type == ACPI_TYPE_BUFFER ?
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obj->buffer.length : 0);
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}
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kfree(obj);
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return -EINVAL;
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}
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*ret = obj->integer.value;
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kfree(obj);
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return 0;
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}
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static int msi_wmi_set_block(int instance, int value)
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{
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acpi_status status;
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struct acpi_buffer input = { sizeof(int), &value };
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pr_debug("Going to set block of instance: %d - value: %d\n",
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instance, value);
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status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
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return ACPI_SUCCESS(status) ? 0 : 1;
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}
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static int bl_get(struct backlight_device *bd)
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{
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int level, err, ret;
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/* Instance 1 is "get backlight", cmp with DSDT */
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err = msi_wmi_query_block(1, &ret);
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if (err) {
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pr_err("Could not query backlight: %d\n", err);
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return -EINVAL;
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}
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pr_debug("Get: Query block returned: %d\n", ret);
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for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
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if (backlight_map[level] == ret) {
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pr_debug("Current backlight level: 0x%X - index: %d\n",
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backlight_map[level], level);
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break;
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}
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}
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if (level == ARRAY_SIZE(backlight_map)) {
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pr_err("get: Invalid brightness value: 0x%X\n", ret);
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return -EINVAL;
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}
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return level;
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}
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static int bl_set_status(struct backlight_device *bd)
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{
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int bright = bd->props.brightness;
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if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
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return -EINVAL;
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/* Instance 0 is "set backlight" */
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return msi_wmi_set_block(0, backlight_map[bright]);
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}
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static const struct backlight_ops msi_backlight_ops = {
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.get_brightness = bl_get,
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.update_status = bl_set_status,
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};
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static void msi_wmi_notify(u32 value, void *context)
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{
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struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
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struct key_entry *key;
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union acpi_object *obj;
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acpi_status status;
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status = wmi_get_event_data(value, &response);
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if (status != AE_OK) {
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pr_info("bad event status 0x%x\n", status);
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return;
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}
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obj = (union acpi_object *)response.pointer;
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if (obj && obj->type == ACPI_TYPE_INTEGER) {
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int eventcode = obj->integer.value;
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pr_debug("Eventcode: 0x%x\n", eventcode);
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key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
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eventcode);
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if (!key) {
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pr_info("Unknown key pressed - %x\n", eventcode);
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goto msi_wmi_notify_exit;
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}
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if (event_wmi->quirk_last_pressed) {
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ktime_t cur = ktime_get_real();
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ktime_t diff = ktime_sub(cur, last_pressed);
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/* Ignore event if any event happened in a 50 ms
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timeframe -> Key press may result in 10-20 GPEs */
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if (ktime_to_us(diff) < 1000 * 50) {
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pr_debug("Suppressed key event 0x%X - "
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"Last press was %lld us ago\n",
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key->code, ktime_to_us(diff));
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goto msi_wmi_notify_exit;
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}
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last_pressed = cur;
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}
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if (key->type == KE_KEY &&
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/* Brightness is served via acpi video driver */
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(backlight ||
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(key->code != MSI_KEY_BRIGHTNESSUP &&
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key->code != MSI_KEY_BRIGHTNESSDOWN))) {
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pr_debug("Send key: 0x%X - Input layer keycode: %d\n",
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key->code, key->keycode);
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sparse_keymap_report_entry(msi_wmi_input_dev, key, 1,
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true);
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}
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} else
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pr_info("Unknown event received\n");
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msi_wmi_notify_exit:
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kfree(response.pointer);
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}
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static int __init msi_wmi_backlight_setup(void)
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{
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int err;
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struct backlight_properties props;
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memset(&props, 0, sizeof(struct backlight_properties));
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props.type = BACKLIGHT_PLATFORM;
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props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
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backlight = backlight_device_register(DRV_NAME, NULL, NULL,
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&msi_backlight_ops,
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&props);
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if (IS_ERR(backlight))
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return PTR_ERR(backlight);
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err = bl_get(NULL);
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if (err < 0) {
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backlight_device_unregister(backlight);
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return err;
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}
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backlight->props.brightness = err;
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return 0;
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}
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static int __init msi_wmi_input_setup(void)
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{
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int err;
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msi_wmi_input_dev = input_allocate_device();
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if (!msi_wmi_input_dev)
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return -ENOMEM;
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msi_wmi_input_dev->name = "MSI WMI hotkeys";
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msi_wmi_input_dev->phys = "wmi/input0";
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msi_wmi_input_dev->id.bustype = BUS_HOST;
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err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
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if (err)
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goto err_free_dev;
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err = input_register_device(msi_wmi_input_dev);
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if (err)
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goto err_free_dev;
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last_pressed = 0;
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return 0;
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err_free_dev:
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input_free_device(msi_wmi_input_dev);
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return err;
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}
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static int __init msi_wmi_init(void)
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{
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int err;
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int i;
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for (i = 0; i < ARRAY_SIZE(event_wmis); i++) {
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if (!wmi_has_guid(event_wmis[i].guid))
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continue;
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err = msi_wmi_input_setup();
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if (err) {
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pr_err("Unable to setup input device\n");
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return err;
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}
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err = wmi_install_notify_handler(event_wmis[i].guid,
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msi_wmi_notify, NULL);
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if (ACPI_FAILURE(err)) {
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pr_err("Unable to setup WMI notify handler\n");
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goto err_free_input;
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}
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pr_debug("Event handler installed\n");
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event_wmi = &event_wmis[i];
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break;
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}
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if (wmi_has_guid(MSIWMI_BIOS_GUID) &&
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acpi_video_get_backlight_type() == acpi_backlight_vendor) {
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err = msi_wmi_backlight_setup();
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if (err) {
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pr_err("Unable to setup backlight device\n");
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goto err_uninstall_handler;
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}
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pr_debug("Backlight device created\n");
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}
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if (!event_wmi && !backlight) {
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pr_err("This machine doesn't have neither MSI-hotkeys nor backlight through WMI\n");
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return -ENODEV;
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}
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return 0;
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err_uninstall_handler:
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if (event_wmi)
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wmi_remove_notify_handler(event_wmi->guid);
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err_free_input:
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if (event_wmi)
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input_unregister_device(msi_wmi_input_dev);
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return err;
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}
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static void __exit msi_wmi_exit(void)
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{
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if (event_wmi) {
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wmi_remove_notify_handler(event_wmi->guid);
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input_unregister_device(msi_wmi_input_dev);
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}
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backlight_device_unregister(backlight);
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}
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module_init(msi_wmi_init);
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module_exit(msi_wmi_exit);
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