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authorJoão Paulo Rechi Vita <jprvita@gmail.com>2016-06-13 16:57:30 -0400
committerDarren Hart <dvhart@linux.intel.com>2016-07-01 16:01:26 -0700
commit2c1a49c961237ed8758af3188673b0e9a8826ac6 (patch)
tree00da181b507b503382ca8d0531eaa87cbad1f89e /drivers
parent08a245160bce8b3d044fa0fdac9ca099bd720706 (diff)
asus-wireless: Toggle airplane mode LED
In the ASHS device we have the HSWC method, which calls either OWGD or OWGS, depending on its parameter: Device (ASHS) { Name (_HID, "ATK4002") // _HID: Hardware ID Method (HSWC, 1, Serialized) { If ((Arg0 < 0x02)) { OWGD (Arg0) Return (One) } If ((Arg0 == 0x02)) { Local0 = OWGS () If (Local0) { Return (0x05) } Else { Return (0x04) } } If ((Arg0 == 0x03)) { Return (0xFF) } If ((Arg0 == 0x04)) { OWGD (Zero) Return (One) } If ((Arg0 == 0x05)) { OWGD (One) Return (One) } If ((Arg0 == 0x80)) { Return (One) } } Method (_STA, 0, NotSerialized) // _STA: Status { If ((MSOS () >= OSW8)) { Return (0x0F) } Else { Return (Zero) } } } On the Asus laptops that do not have an airplane mode LED, OWGD has an empty implementation and OWGS simply returns 0. On the ones that have an airplane mode LED these methods have the following implementation: Method (OWGD, 1, Serialized) { SGPL (0x0203000F, Arg0) SGPL (0x0203000F, Arg0) } Method (OWGS, 0, Serialized) { Store (RGPL (0x0203000F), Local0) Return (Local0) } Where OWGD(1) sets the airplane mode LED ON, OWGD(0) set it off, and OWGS() returns its state. This commit exposes the airplane mode indicator LED to userspace under the name asus-wireless::airplane, so it can be driven according to userspace's policy. Signed-off-by: João Paulo Rechi Vita <jprvita@endlessm.com> Reviewed-by: Corentin Chary <corentin.chary@gmail.com> Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/platform/x86/Kconfig2
-rw-r--r--drivers/platform/x86/asus-wireless.c91
2 files changed, 92 insertions, 1 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 633fc5c191fc..b0b98e413343 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -604,6 +604,8 @@ config ASUS_WIRELESS
tristate "Asus Wireless Radio Control Driver"
depends on ACPI
depends on INPUT
+ select NEW_LEDS
+ select LEDS_CLASS
---help---
The Asus Wireless Radio Control handles the airplane mode hotkey
present on some Asus laptops.
diff --git a/drivers/platform/x86/asus-wireless.c b/drivers/platform/x86/asus-wireless.c
index 9ec721e26532..9f31bc1a47d0 100644
--- a/drivers/platform/x86/asus-wireless.c
+++ b/drivers/platform/x86/asus-wireless.c
@@ -15,11 +15,78 @@
#include <linux/acpi.h>
#include <linux/input.h>
#include <linux/pci_ids.h>
+#include <linux/leds.h>
+
+#define ASUS_WIRELESS_LED_STATUS 0x2
+#define ASUS_WIRELESS_LED_OFF 0x4
+#define ASUS_WIRELESS_LED_ON 0x5
struct asus_wireless_data {
struct input_dev *idev;
+ struct acpi_device *adev;
+ struct workqueue_struct *wq;
+ struct work_struct led_work;
+ struct led_classdev led;
+ int led_state;
};
+static u64 asus_wireless_method(acpi_handle handle, const char *method,
+ int param)
+{
+ struct acpi_object_list p;
+ union acpi_object obj;
+ acpi_status s;
+ u64 ret;
+
+ acpi_handle_debug(handle, "Evaluating method %s, parameter %#x\n",
+ method, param);
+ obj.type = ACPI_TYPE_INTEGER;
+ obj.integer.value = param;
+ p.count = 1;
+ p.pointer = &obj;
+
+ s = acpi_evaluate_integer(handle, (acpi_string) method, &p, &ret);
+ if (ACPI_FAILURE(s))
+ acpi_handle_err(handle,
+ "Failed to eval method %s, param %#x (%d)\n",
+ method, param, s);
+ acpi_handle_debug(handle, "%s returned %#x\n", method, (uint) ret);
+ return ret;
+}
+
+static enum led_brightness led_state_get(struct led_classdev *led)
+{
+ struct asus_wireless_data *data;
+ int s;
+
+ data = container_of(led, struct asus_wireless_data, led);
+ s = asus_wireless_method(acpi_device_handle(data->adev), "HSWC",
+ ASUS_WIRELESS_LED_STATUS);
+ if (s == ASUS_WIRELESS_LED_ON)
+ return LED_FULL;
+ return LED_OFF;
+}
+
+static void led_state_update(struct work_struct *work)
+{
+ struct asus_wireless_data *data;
+
+ data = container_of(work, struct asus_wireless_data, led_work);
+ asus_wireless_method(acpi_device_handle(data->adev), "HSWC",
+ data->led_state);
+}
+
+static void led_state_set(struct led_classdev *led,
+ enum led_brightness value)
+{
+ struct asus_wireless_data *data;
+
+ data = container_of(led, struct asus_wireless_data, led);
+ data->led_state = value == LED_OFF ? ASUS_WIRELESS_LED_OFF :
+ ASUS_WIRELESS_LED_ON;
+ queue_work(data->wq, &data->led_work);
+}
+
static void asus_wireless_notify(struct acpi_device *adev, u32 event)
{
struct asus_wireless_data *data = acpi_driver_data(adev);
@@ -37,6 +104,7 @@ static void asus_wireless_notify(struct acpi_device *adev, u32 event)
static int asus_wireless_add(struct acpi_device *adev)
{
struct asus_wireless_data *data;
+ int err;
data = devm_kzalloc(&adev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
@@ -52,11 +120,32 @@ static int asus_wireless_add(struct acpi_device *adev)
data->idev->id.vendor = PCI_VENDOR_ID_ASUSTEK;
set_bit(EV_KEY, data->idev->evbit);
set_bit(KEY_RFKILL, data->idev->keybit);
- return input_register_device(data->idev);
+ err = input_register_device(data->idev);
+ if (err)
+ return err;
+
+ data->adev = adev;
+ data->wq = create_singlethread_workqueue("asus_wireless_workqueue");
+ if (!data->wq)
+ return -ENOMEM;
+ INIT_WORK(&data->led_work, led_state_update);
+ data->led.name = "asus-wireless::airplane";
+ data->led.brightness_set = led_state_set;
+ data->led.brightness_get = led_state_get;
+ data->led.flags = LED_CORE_SUSPENDRESUME;
+ data->led.max_brightness = 1;
+ err = devm_led_classdev_register(&adev->dev, &data->led);
+ if (err)
+ destroy_workqueue(data->wq);
+ return err;
}
static int asus_wireless_remove(struct acpi_device *adev)
{
+ struct asus_wireless_data *data = acpi_driver_data(adev);
+
+ if (data->wq)
+ destroy_workqueue(data->wq);
return 0;
}