platform/x86: Add Acer Wireless Radio Control driver

New Acer laptops in 2018 will have a separate ACPI device for
notifications from the airplane mode hotkey. The device name in
the DSDT is SMKB and its ACPI _HID is 10251229.

For these models, when the airplane mode hotkey (Fn+F3) pressed,
a query 0x02 is started in the Embedded Controller, and all this
query does is a notify SMKB with the value 0x80.

        Scope (_SB.PCI0.LPCB.EC0)
        {
                (...)
                Method (_Q02, 0, NotSerialized)  // _Qxx: EC Query
                {
                    HKEV (0x2, One)
		    Notify (SMKB, 0x80)	// Status Change
                }
        }

Based on code from asus-wireless

Signed-off-by: Chris Chiu <chiu@endlessm.com>
Reviewed-by: João Paulo Rechi Vita <jprvita@endlessm.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

1 files changed, 71 insertions, 0 deletions

diff --git a/drivers/platform/x86/acer-wireless.c b/drivers/platform/x86/acer-wireless.c
new file mode 100644
index 000000000000..858037987b33
--- /dev/null
+++ b/drivers/platform/x86/acer-wireless.c
@@ -0,0 +1,71 @@
+/*
+ * Acer Wireless Radio Control Driver
+ *
+ * Copyright (C) 2017 Endless Mobile, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci_ids.h>
+#include <linux/types.h>
+
+static const struct acpi_device_id acer_wireless_acpi_ids[] = {
+	{"10251229", 0},
+	{"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, acer_wireless_acpi_ids);
+
+static void acer_wireless_notify(struct acpi_device *adev, u32 event)
+{
+	struct input_dev *idev = acpi_driver_data(adev);
+
+	dev_dbg(&adev->dev, "event=%#x\n", event);
+	if (event != 0x80) {
+		dev_notice(&adev->dev, "Unknown SMKB event: %#x\n", event);
+		return;
+	}
+	input_report_key(idev, KEY_RFKILL, 1);
+	input_report_key(idev, KEY_RFKILL, 0);
+	input_sync(idev);
+}
+
+static int acer_wireless_add(struct acpi_device *adev)
+{
+	struct input_dev *idev;
+
+	idev = devm_input_allocate_device(&adev->dev);
+	if (!idev)
+		return -ENOMEM;
+
+	adev->driver_data = idev;
+	idev->name = "Acer Wireless Radio Control";
+	idev->phys = "acer-wireless/input0";
+	idev->id.bustype = BUS_HOST;
+	idev->id.vendor = PCI_VENDOR_ID_AI;
+	idev->id.product = 0x1229;
+	set_bit(EV_KEY, idev->evbit);
+	set_bit(KEY_RFKILL, idev->keybit);
+
+	return input_register_device(idev);
+}
+
+static struct acpi_driver acer_wireless_driver = {
+	.name = "Acer Wireless Radio Control Driver",
+	.class = "hotkey",
+	.ids = acer_wireless_acpi_ids,
+	.ops = {
+		.add = acer_wireless_add,
+		.notify = acer_wireless_notify,
+	},
+};
+module_acpi_driver(acer_wireless_driver);
+
+MODULE_DESCRIPTION("Acer Wireless Radio Control Driver");
+MODULE_AUTHOR("Chris Chiu <chiu@gmail.com>");
+MODULE_LICENSE("GPL v2");