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.h...@canonical.com> --- MAINTAINERS | 6 + drivers/platform/x86/Kconfig | 11 ++ drivers/platform/x86/Makefile | 1 + drivers/platform/x86/asus-rbtn.c | 240 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 258 insertions(+) create mode 100644 drivers/platform/x86/asus-rbtn.c diff --git a/MAINTAINERS b/MAINTAINERS index d8afd29..03711ce 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1673,6 +1673,12 @@ S: Maintained F: drivers/platform/x86/asus*.c F: drivers/platform/x86/eeepc*.c +ASUS RADIO BUTTON DRIVER +M: Alex Hung <alex.h...@canonical.com> +L: platform-driver-...@vger.kernel.org +S: Maintained +F: drivers/platform/x86/asus-rbtn.c + ASYNCHRONOUS TRANSFERS/TRANSFORMS (IOAT) API R: Dan Williams <dan.j.willi...@intel.com> W: http://sourceforge.net/projects/xscaleiop diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index f9f205c..a8ac885 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_RBTN + 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 asus-rbtn. + 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..6710bb3 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_RBTN) += asus-rbtn.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-rbtn.c b/drivers/platform/x86/asus-rbtn.c new file mode 100644 index 0000000..a469881 --- /dev/null +++ b/drivers/platform/x86/asus-rbtn.c @@ -0,0 +1,240 @@ +/* + * asus-rbtn radio button for Windows 8 + * + * Copyright (C) 2015 Alex Hung <alex.h...@canonical.com> + * + * 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:*"); + +#define ASUS_RBTN_NOTIFY 0x88 + +static struct platform_device *asuspl_dev; +static struct input_dev *asusrb_input_dev; +static struct rfkill *asus_rfkill; +static struct acpi_device *asus_rbtn_device; +static int radio_led_state; + +static const struct acpi_device_id asusrb_ids[] = { + {"ATK4001", 0}, + {"", 0}, +}; + +static int asus_radio_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_rbtn_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_rfkill_set(void *data, bool blocked) +{ + radio_led_state = blocked ? 0 : 1; + + return asus_radio_led_set(radio_led_state); +} + +static const struct rfkill_ops asus_rfkill_ops = { + .set_block = asus_rfkill_set, +}; + +static int asusrb_rfkill_setup(struct acpi_device *device) +{ + int err; + + asus_rfkill = rfkill_alloc("asus_rbtn", + &device->dev, + RFKILL_TYPE_WLAN, + &asus_rfkill_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_rbtn_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_rbtn_input_destroy(void) +{ + input_unregister_device(asusrb_input_dev); +} + +static void asusrb_notify(struct acpi_device *acpi_dev, u32 event) +{ + if (event != ASUS_RBTN_NOTIFY) { + 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_rbtn_device = device; + + err = asus_rbtn_input_setup(); + if (err) { + pr_err("failed to setup asus_rbtn hotkeys\n"); + return err; + } + + err = asusrb_rfkill_setup(device); + if (err) + pr_err("failed to setup asus_rbtn rfkill\n"); + + return err; +} + +static int asusrb_remove(struct acpi_device *device) +{ + asus_rbtn_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 button", + .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_radio_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-rbtn", + .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-rbtn", -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); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
