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Subject[PATCH v2] platform/x86: Add Acer Wireless Radio Control driver
Date
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>
---

Notes:
v2: less code and no redundant data structure

drivers/platform/x86/Kconfig | 14 +++++++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/acer-wireless.c | 71 ++++++++++++++++++++++++++++++++++++
3 files changed, 86 insertions(+)
create mode 100644 drivers/platform/x86/acer-wireless.c

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 80b87954f6dd..6c8b3eaf35df 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -36,6 +36,20 @@ config ACER_WMI
If you have an ACPI-WMI compatible Acer/ Wistron laptop, say Y or M
here.

+config ACER_WIRELESS
+ tristate "Acer Wireless Radio Control Driver"
+ depends on ACPI
+ depends on INPUT
+ ---help---
+ The Acer Wireless Radio Control handles the airplane mode hotkey
+ present on new Acer laptops.
+
+ Say Y or M here if you have an Acer notebook with an airplane mode
+ hotkey.
+
+ If you choose to compile this driver as a module the module will be
+ called acer-wireless.
+
config ACERHDF
tristate "Acer Aspire One temperature and fan driver"
depends on ACPI && THERMAL
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 91cec1751461..4fd15503d842 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_DELL_WMI_LED) += dell-wmi-led.o
obj-$(CONFIG_DELL_SMO8800) += dell-smo8800.o
obj-$(CONFIG_DELL_RBTN) += dell-rbtn.o
obj-$(CONFIG_ACER_WMI) += acer-wmi.o
+obj-$(CONFIG_ACER_WIRELESS) += acer-wireless.o
obj-$(CONFIG_ACERHDF) += acerhdf.o
obj-$(CONFIG_HP_ACCEL) += hp_accel.o
obj-$(CONFIG_HP_WIRELESS) += hp-wireless.o
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");
--
2.11.0
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