ASUS introduced a new approach to handle wireless hotkey
since Windows 8. When the hotkey is pressed, BIOS generates
a notification 0x88 to a new ACPI device, ATK4001. This
new driver not only translates the notification to KEY_RFKILL
but also toggles its LED accordingly.
Signed-off-by: Alex Hung <alex.hung@xxxxxxxxxxxxx>
---
drivers/platform/x86/Kconfig | 11 ++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/asus-radio.c | 238 +++++++++++++++++++++++++++++++++++++
3 files changed, 250 insertions(+)
create mode 100644 drivers/platform/x86/asus-radio.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 638e7970..d2adc79 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -516,6 +516,17 @@ config EEEPC_LAPTOP
If you have an Eee PC laptop, say Y or M here. If this driver
doesn't work on your Eee PC, try eeepc-wmi instead.
+config ASUS_RADIO
+ tristate "ASUS radio button"
+ depends on ACPI
+ depends on INPUT
+ help
+ This driver provides supports for new ASUS radio button for Windows 8.
+ On such systems the driver should load automatically (via ACPI alias).
+
+ To compile this driver as a module, choose M here: the module will
+ be called hp-wireless.
+
config ASUS_WMI
tristate "ASUS WMI Driver"
depends on ACPI_WMI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index f82232b..aecd403 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -3,6 +3,7 @@
# x86 Platform-Specific Drivers
#
obj-$(CONFIG_ASUS_LAPTOP) += asus-laptop.o
+obj-$(CONFIG_ASUS_RADIO) += asus-radio.o
obj-$(CONFIG_ASUS_WMI) += asus-wmi.o
obj-$(CONFIG_ASUS_NB_WMI) += asus-nb-wmi.o
obj-$(CONFIG_EEEPC_LAPTOP) += eeepc-laptop.o
diff --git a/drivers/platform/x86/asus-radio.c b/drivers/platform/x86/asus-radio.c
new file mode 100644
index 0000000..4d519ce
--- /dev/null
+++ b/drivers/platform/x86/asus-radio.c
@@ -0,0 +1,238 @@
+/*
+ * asus-radio button for Windows 8
+ *
+ * Copyright (C) 2015 Alex Hung <alex.hung@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+#include <acpi/acpi_bus.h>
+#include <linux/rfkill.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alex Hung");
+MODULE_ALIAS("acpi*:ATK4001:*");
+
+static struct platform_device *asuspl_dev;
+static struct input_dev *asusrb_input_dev;
+static struct rfkill *asus_rfkill;
+static struct acpi_device *asus_radio_device;
+static int radio_led_state;
+
+static const struct acpi_device_id asusrb_ids[] = {
+ {"ATK4001", 0},
+ {"", 0},
+};
+
+static int asus_led_set(bool blocked)
+{
+ acpi_status status;
+ union acpi_object arg0 = { ACPI_TYPE_INTEGER };
+ struct acpi_object_list args = { 1, &arg0 };
+ unsigned long long output;
+
+ arg0.integer.value = blocked;
+ status = acpi_evaluate_integer(asus_radio_device->handle, "HSWC",
+ &args, &output);
+ if (!ACPI_SUCCESS(status) || output == 0) {
+ pr_err("fail to change wireless LED.\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int asus_rfk_set(void *data, bool blocked)
+{
+ radio_led_state = blocked ? 0 : 1;
+
+ return asus_led_set(radio_led_state);
+}
+
+static const struct rfkill_ops asus_rfk_ops = {
+ .set_block = asus_rfk_set,
+};
+
+static int asusrb_rfkill_setup(struct acpi_device *device)
+{
+ int err = 0;
+
+ asus_rfkill = rfkill_alloc("asus_radio",
+ &device->dev,
+ RFKILL_TYPE_WLAN,
+ &asus_rfk_ops,
+ device);
+ if (!asus_rfkill) {
+ pr_err("unable to allocate rfkill device\n");
+ return -ENOMEM;
+ }
+
+ err = rfkill_register(asus_rfkill);
+ if (err) {
+ pr_err("unable to register rfkill device\n");
+ rfkill_destroy(asus_rfkill);
+ }
+
+ return err;
+}
+
+static int asus_radio_input_setup(void)
+{
+ int err;
+
+ asusrb_input_dev = input_allocate_device();
+ if (!asusrb_input_dev)
+ return -ENOMEM;
+
+ asusrb_input_dev->name = "ASUS radio hotkeys";
+ asusrb_input_dev->phys = "atk4001/input0";
+ asusrb_input_dev->id.bustype = BUS_HOST;
+ asusrb_input_dev->evbit[0] = BIT(EV_KEY);
+ set_bit(KEY_RFKILL, asusrb_input_dev->keybit);
+
+ err = input_register_device(asusrb_input_dev);
+ if (err)
+ goto err_free_dev;
+
+ return 0;
+
+err_free_dev:
+ input_free_device(asusrb_input_dev);
+ return err;
+}
+
+static void asus_radio_input_destroy(void)
+{
+ input_unregister_device(asusrb_input_dev);
+}
+
+static void asusrb_notify(struct acpi_device *acpi_dev, u32 event)
+{
+ if (event != 0x88) {
+ pr_err("received unknown event (0x%x)\n", event);
+ return;
+ }
+
+ input_report_key(asusrb_input_dev, KEY_RFKILL, 1);
+ input_sync(asusrb_input_dev);
+ input_report_key(asusrb_input_dev, KEY_RFKILL, 0);
+ input_sync(asusrb_input_dev);
+}
+
+static int asusrb_add(struct acpi_device *device)
+{
+ int err;
+
+ asus_radio_device = device;
+
+ err = asus_radio_input_setup();
+ if (err) {
+ pr_err("failed to setup asus_radio hotkeys\n");
+ goto failed;
+ }
+
+ err = asusrb_rfkill_setup(device);
+ if (err)
+ pr_err("failed to setup asus_radio rfkill\n");
+ failed:
+ return err;
+}
+
+static int asusrb_remove(struct acpi_device *device)
+{
+ asus_radio_input_destroy();
+
+ if (asus_rfkill) {
+ rfkill_unregister(asus_rfkill);
+ rfkill_destroy(asus_rfkill);
+ }
+
+ return 0;
+}
+
+static struct acpi_driver asusrb_driver = {
+ .name = "asus acpi radio",
+ .owner = THIS_MODULE,
+ .ids = asusrb_ids,
+ .ops = {
+ .add = asusrb_add,
+ .remove = asusrb_remove,
+ .notify = asusrb_notify,
+ },
+};
+
+static int asusrb_resume_handler(struct device *device)
+{
+ return asus_led_set(radio_led_state);
+}
+
+static const struct dev_pm_ops asuspl_pm_ops = {
+ .resume = asusrb_resume_handler,
+};
+
+static struct platform_driver asuspl_driver = {
+ .driver = {
+ .name = "asus-radio",
+ .pm = &asuspl_pm_ops,
+ },
+};
+
+static int __init asusrb_init(void)
+{
+ int err;
+
+ pr_info("Initializing ATK4001 module\n");
+ err = acpi_bus_register_driver(&asusrb_driver);
+ if (err)
+ goto err_driver_reg;
+
+ err = platform_driver_register(&asuspl_driver);
+ if (err)
+ goto err_driver_reg;
+
+ asuspl_dev = platform_device_alloc("asus-radio", -1);
+ if (!asuspl_dev) {
+ err = -ENOMEM;
+ goto err_device_alloc;
+ }
+ err = platform_device_add(asuspl_dev);
+ if (err)
+ goto err_device_add;
+
+ return 0;
+
+err_device_add:
+ platform_device_put(asuspl_dev);
+err_device_alloc:
+ platform_driver_unregister(&asuspl_driver);
+err_driver_reg:
+ return err;
+}
+
+static void __exit asusrb_exit(void)
+{
+ pr_info("Exiting ATK4001 module\n");
+ acpi_bus_unregister_driver(&asusrb_driver);
+
+ if (asuspl_dev) {
+ platform_device_unregister(asuspl_dev);
+ platform_driver_unregister(&asuspl_driver);
+ }
+}
+
+module_init(asusrb_init);
+module_exit(asusrb_exit);
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in
