1 files changed, 128 insertions, 0 deletions
diff --git a/drivers/platform/x86/peaq-wmi.c b/drivers/platform/x86/peaq-wmi.c
new file mode 100644
index 000000000..cf9c44c20
--- /dev/null
+++ b/drivers/platform/x86/peaq-wmi.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PEAQ 2-in-1 WMI hotkey driver
+ * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <linux/acpi.h>
+#include <linux/dmi.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#define PEAQ_DOLBY_BUTTON_GUID		"ABBC0F6F-8EA1-11D1-00A0-C90629100000"
+#define PEAQ_DOLBY_BUTTON_METHOD_ID	5
+#define PEAQ_POLL_INTERVAL_MS		250
+#define PEAQ_POLL_IGNORE_MS		500
+#define PEAQ_POLL_MAX_MS		1000
+
+MODULE_ALIAS("wmi:"PEAQ_DOLBY_BUTTON_GUID);
+
+static struct input_dev *peaq_poll_dev;
+
+/*
+ * The Dolby button (yes really a Dolby button) causes an ACPI variable to get
+ * set on both press and release. The WMI method checks and clears that flag.
+ * So for a press + release we will get back One from the WMI method either once
+ * (if polling after the release) or twice (polling between press and release).
+ * We ignore events for 0.5s after the first event to avoid reporting 2 presses.
+ */
+static void peaq_wmi_poll(struct input_dev *input_dev)
+{
+	static unsigned long last_event_time;
+	static bool had_events;
+	union acpi_object obj;
+	acpi_status status;
+	u32 dummy = 0;
+
+	struct acpi_buffer input = { sizeof(dummy), &dummy };
+	struct acpi_buffer output = { sizeof(obj), &obj };
+
+	status = wmi_evaluate_method(PEAQ_DOLBY_BUTTON_GUID, 0,
+				     PEAQ_DOLBY_BUTTON_METHOD_ID,
+				     &input, &output);
+	if (ACPI_FAILURE(status))
+		return;
+
+	if (obj.type != ACPI_TYPE_INTEGER) {
+		dev_err(&input_dev->dev,
+			"Error WMBC did not return an integer\n");
+		return;
+	}
+
+	if (!obj.integer.value)
+		return;
+
+	if (had_events && time_before(jiffies, last_event_time +
+					msecs_to_jiffies(PEAQ_POLL_IGNORE_MS)))
+		return;
+
+	input_event(input_dev, EV_KEY, KEY_SOUND, 1);
+	input_sync(input_dev);
+	input_event(input_dev, EV_KEY, KEY_SOUND, 0);
+	input_sync(input_dev);
+
+	last_event_time = jiffies;
+	had_events = true;
+}
+
+/* Some other devices (Shuttle XS35) use the same WMI GUID for other purposes */
+static const struct dmi_system_id peaq_dmi_table[] __initconst = {
+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "PEAQ"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "PEAQ PMM C1010 MD99187"),
+		},
+	},
+	{}
+};
+
+static int __init peaq_wmi_init(void)
+{
+	int err;
+
+	/* WMI GUID is not unique, also check for a DMI match */
+	if (!dmi_check_system(peaq_dmi_table))
+		return -ENODEV;
+
+	if (!wmi_has_guid(PEAQ_DOLBY_BUTTON_GUID))
+		return -ENODEV;
+
+	peaq_poll_dev = input_allocate_device();
+	if (!peaq_poll_dev)
+		return -ENOMEM;
+
+	peaq_poll_dev->name = "PEAQ WMI hotkeys";
+	peaq_poll_dev->phys = "wmi/input0";
+	peaq_poll_dev->id.bustype = BUS_HOST;
+	input_set_capability(peaq_poll_dev, EV_KEY, KEY_SOUND);
+
+	err = input_setup_polling(peaq_poll_dev, peaq_wmi_poll);
+	if (err)
+		goto err_out;
+
+	input_set_poll_interval(peaq_poll_dev, PEAQ_POLL_INTERVAL_MS);
+	input_set_max_poll_interval(peaq_poll_dev, PEAQ_POLL_MAX_MS);
+
+	err = input_register_device(peaq_poll_dev);
+	if (err)
+		goto err_out;
+
+	return 0;
+
+err_out:
+	input_free_device(peaq_poll_dev);
+	return err;
+}
+
+static void __exit peaq_wmi_exit(void)
+{
+	input_unregister_device(peaq_poll_dev);
+}
+
+module_init(peaq_wmi_init);
+module_exit(peaq_wmi_exit);
+
+MODULE_DESCRIPTION("PEAQ 2-in-1 WMI hotkey driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL");