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 <[email protected]>

Reviewed-by João Paulo Rechi Vita <[email protected]>

---

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

drivers/platform/x86/Kconfig +14 -0

index 80b87954f6dd..6c8b3eaf35df 100644
@@ -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

drivers/platform/x86/Makefile +1 -0

index 91cec1751461..4fd15503d842 100644
@@ -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

drivers/platform/x86/acer-wireless.c new file +71 -1

new file mode 100644
index 000000000000..858037987b33
@@ -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 <[email protected]>");
+MODULE_LICENSE("GPL v2");
--

2.11.0