There is an indicator LED signaling activated power saving mode
on certain Fujitsu laptop models. This has currently no use on Linux.
Export it to userspace.
Signed-off-by: Matej Groma <matejgroma@xxxxxxxxx>
---
Notes:
Tested on Lifebook E756
drivers/platform/x86/fujitsu-laptop.c | 56 +++++++++++++++++++++++++++++++++++
1 file changed, 56 insertions(+)
diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index ce41bc3..66e12a2 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -108,6 +108,8 @@
#define LOGOLAMP_POWERON 0x2000
#define LOGOLAMP_ALWAYS 0x4000
#define RADIO_LED_ON 0x20
+#define ECO_LED 0x10000
+#define ECO_LED_ON 0x80000
#endif
/* Hotkey details */
@@ -176,6 +178,7 @@ struct fujitsu_hotkey_t {
int logolamp_registered;
int kblamps_registered;
int radio_led_registered;
+ int eco_led_registered;
};
static struct fujitsu_hotkey_t *fujitsu_hotkey;
@@ -212,6 +215,17 @@ static struct led_classdev radio_led = {
.brightness_get = radio_led_get,
.brightness_set = radio_led_set
};
+
+static enum led_brightness eco_led_get(struct led_classdev *cdev);
+static void eco_led_set(struct led_classdev *cdev,
+ enum led_brightness brightness);
+
+static struct led_classdev eco_led = {
+ .name = "fujitsu::eco_led",
+ .max_brightness = 1,
+ .brightness_get = eco_led_get,
+ .brightness_set = eco_led_set
+};
#endif
#ifdef CONFIG_FUJITSU_LAPTOP_DEBUG
@@ -296,6 +310,18 @@ static void radio_led_set(struct led_classdev *cdev,
call_fext_func(FUNC_RFKILL, 0x5, RADIO_LED_ON, 0x0);
}
+static void eco_led_set(struct led_classdev *cdev,
+ enum led_brightness brightness)
+{
+ int curr;
+
+ curr = call_fext_func(FUNC_LEDS, 0x2, ECO_LED, 0x0);
+ if (brightness)
+ call_fext_func(FUNC_LEDS, 0x1, ECO_LED, curr | ECO_LED_ON);
+ else
+ call_fext_func(FUNC_LEDS, 0x1, ECO_LED, curr & ~ECO_LED_ON);
+}
+
static enum led_brightness logolamp_get(struct led_classdev *cdev)
{
enum led_brightness brightness = LED_OFF;
@@ -330,6 +356,16 @@ static enum led_brightness radio_led_get(struct led_classdev *cdev)
return brightness;
}
+
+static enum led_brightness eco_led_get(struct led_classdev *cdev)
+{
+ enum led_brightness brightness = LED_OFF;
+
+ if (call_fext_func(FUNC_LEDS, 0x2, ECO_LED, 0x0) & ECO_LED_ON)
+ brightness = cdev->max_brightness;
+
+ return brightness;
+}
#endif
/* Hardware access for LCD brightness control */
@@ -943,6 +979,23 @@ static int acpi_fujitsu_hotkey_add(struct acpi_device *device)
result);
}
}
+
+ /* Support for eco led is not always signaled in bit corresponding
+ * to the bit used to control the led. According to the DSDT table,
+ * bit 14 seems to indicate presence of said led as well.
+ * Confirm by testing the status.
+ */
+ if ((call_fext_func(FUNC_LEDS, 0x0, 0x0, 0x0) & BIT(14)) &&
+ (call_fext_func(FUNC_LEDS, 0x2, ECO_LED, 0x0) != UNSUPPORTED_CMD)) {
+ result = led_classdev_register(&fujitsu->pf_device->dev,
+ &eco_led);
+ if (result == 0) {
+ fujitsu_hotkey->eco_led_registered = 1;
+ } else {
+ pr_err("Could not register LED handler for eco LED, error %i\n",
+ result);
+ }
+ }
#endif
return result;
@@ -972,6 +1025,9 @@ static int acpi_fujitsu_hotkey_remove(struct acpi_device *device)
if (fujitsu_hotkey->radio_led_registered)
led_classdev_unregister(&radio_led);
+
+ if (fujitsu_hotkey->eco_led_registered)
+ led_classdev_unregister(&eco_led);
#endif
input_unregister_device(input);
--
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