msi-wmi: Add MSI Wind support

Add MSI Wind support to msi-wmi driver. MSI Wind has different GUID for
key events, different WMI key scan codes, it does not need filtering
consecutive identical events and it does not support backlight control
via MSIWMI_BIOS_GUID WMI. Tested on MSI Wind U100.
Signed-off-by: NMaxim Mikityanskiy <maxtram95@gmail.com>
Signed-off-by: NMatthew Garrett <matthew.garrett@nebula.com>

drivers/platform/x86/msi-wmi.c

@@ -37,17 +37,27 @@ MODULE_LICENSE("GPL");
 #define DRV_NAME "msi-wmi"
 
 #define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
-#define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
+#define MSIWMI_MSI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
+#define MSIWMI_WIND_EVENT_GUID "5B3CC38A-40D9-7245-8AE6-1145B751BE3F"
 
 MODULE_ALIAS("wmi:" MSIWMI_BIOS_GUID);
-MODULE_ALIAS("wmi:" MSIWMI_EVENT_GUID);
+MODULE_ALIAS("wmi:" MSIWMI_MSI_EVENT_GUID);
+MODULE_ALIAS("wmi:" MSIWMI_WIND_EVENT_GUID);
 
 enum msi_scancodes {
+	/* Generic MSI keys (not present on MSI Wind) */
 	MSI_KEY_BRIGHTNESSUP	= 0xD0,
 	MSI_KEY_BRIGHTNESSDOWN,
 	MSI_KEY_VOLUMEUP,
 	MSI_KEY_VOLUMEDOWN,
 	MSI_KEY_MUTE,
+	/* MSI Wind keys */
+	WIND_KEY_TOUCHPAD	= 0x08,	/* Fn+F3 touchpad toggle */
+	WIND_KEY_BLUETOOTH	= 0x56,	/* Fn+F11 Bluetooth toggle */
+	WIND_KEY_CAMERA,		/* Fn+F6 webcam toggle */
+	WIND_KEY_WLAN		= 0x5f,	/* Fn+F11 Wi-Fi toggle */
+	WIND_KEY_TURBO,			/* Fn+F10 turbo mode toggle */
+	WIND_KEY_ECO		= 0x69,	/* Fn+F10 ECO mode toggle */
 };
 static struct key_entry msi_wmi_keymap[] = {
 	{ KE_KEY, MSI_KEY_BRIGHTNESSUP,		{KEY_BRIGHTNESSUP} },
@@ -55,13 +65,34 @@ static struct key_entry msi_wmi_keymap[] = {
 	{ KE_KEY, MSI_KEY_VOLUMEUP,		{KEY_VOLUMEUP} },
 	{ KE_KEY, MSI_KEY_VOLUMEDOWN,		{KEY_VOLUMEDOWN} },
 	{ KE_KEY, MSI_KEY_MUTE,			{KEY_MUTE} },
+
+	/* These keys work without WMI. Ignore them to avoid double keycodes */
+	{ KE_IGNORE, WIND_KEY_TOUCHPAD,		{KEY_TOUCHPAD_TOGGLE} },
+	{ KE_IGNORE, WIND_KEY_BLUETOOTH,	{KEY_BLUETOOTH} },
+	{ KE_IGNORE, WIND_KEY_CAMERA,		{KEY_CAMERA} },
+	{ KE_IGNORE, WIND_KEY_WLAN,		{KEY_WLAN} },
+
+	/* These are unknown WMI events found on MSI Wind */
+	{ KE_IGNORE, 0x00 },
+	{ KE_IGNORE, 0x62 },
+	{ KE_IGNORE, 0x63 },
+
+	/* These are MSI Wind keys that should be handled via WMI */
+	{ KE_KEY, WIND_KEY_TURBO,		{KEY_PROG1} },
+	{ KE_KEY, WIND_KEY_ECO,			{KEY_PROG2} },
+
 	{ KE_END, 0 }
 };
 
 static ktime_t last_pressed;
-static bool quirk_last_pressed;
 
-static const char *event_wmi_guid;
+static const struct {
+	const char *guid;
+	bool quirk_last_pressed;
+} *event_wmi, event_wmis[] = {
+	{ MSIWMI_MSI_EVENT_GUID, true },
+	{ MSIWMI_WIND_EVENT_GUID, false },
+};
 
 static struct backlight_device *backlight;
 
@@ -174,7 +205,7 @@ static void msi_wmi_notify(u32 value, void *context)
 			goto msi_wmi_notify_exit;
 		}
 
-		if (quirk_last_pressed) {
+		if (event_wmi->quirk_last_pressed) {
 			ktime_t cur = ktime_get_real();
 			ktime_t diff = ktime_sub(cur, last_pressed);
 			/* Ignore event if any event happened in a 50 ms
@@ -265,15 +296,19 @@ static int __init msi_wmi_input_setup(void)
 static int __init msi_wmi_init(void)
 {
 	int err;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(event_wmis); i++) {
+		if (!wmi_has_guid(event_wmis[i].guid))
+			continue;
 
-	if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
 		err = msi_wmi_input_setup();
 		if (err) {
 			pr_err("Unable to setup input device\n");
 			return err;
 		}
 
-		err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
+		err = wmi_install_notify_handler(event_wmis[i].guid,
 			msi_wmi_notify, NULL);
 		if (ACPI_FAILURE(err)) {
 			pr_err("Unable to setup WMI notify handler\n");
@@ -281,8 +316,8 @@ static int __init msi_wmi_init(void)
 		}
 
 		pr_debug("Event handler installed\n");
-		event_wmi_guid = MSIWMI_EVENT_GUID;
-		quirk_last_pressed = true;
+		event_wmi = &event_wmis[i];
+		break;
 	}
 
 	if (wmi_has_guid(MSIWMI_BIOS_GUID) && !acpi_video_backlight_support()) {
@@ -294,7 +329,7 @@ static int __init msi_wmi_init(void)
 		pr_debug("Backlight device created\n");
 	}
 
-	if (!event_wmi_guid && !backlight) {
+	if (!event_wmi && !backlight) {
 		pr_err("This machine doesn't have neither MSI-hotkeys nor backlight through WMI\n");
 		return -ENODEV;
 	}
@@ -302,10 +337,10 @@ static int __init msi_wmi_init(void)
 	return 0;
 
 err_uninstall_handler:
-	if (event_wmi_guid)
-		wmi_remove_notify_handler(event_wmi_guid);
+	if (event_wmi)
+		wmi_remove_notify_handler(event_wmi->guid);
 err_free_input:
-	if (event_wmi_guid) {
+	if (event_wmi) {
 		sparse_keymap_free(msi_wmi_input_dev);
 		input_unregister_device(msi_wmi_input_dev);
 	}
@@ -314,8 +349,8 @@ static int __init msi_wmi_init(void)
 
 static void __exit msi_wmi_exit(void)
 {
-	if (event_wmi_guid) {
-		wmi_remove_notify_handler(event_wmi_guid);
+	if (event_wmi) {
+		wmi_remove_notify_handler(event_wmi->guid);
 		sparse_keymap_free(msi_wmi_input_dev);
 		input_unregister_device(msi_wmi_input_dev);
 	}