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path: root/drivers/hwmon/hp_accel.c
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Diffstat (limited to 'drivers/hwmon/hp_accel.c')
-rw-r--r--drivers/hwmon/hp_accel.c75
1 files changed, 72 insertions, 3 deletions
diff --git a/drivers/hwmon/hp_accel.c b/drivers/hwmon/hp_accel.c
index bf8d4058057..03705240000 100644
--- a/drivers/hwmon/hp_accel.c
+++ b/drivers/hwmon/hp_accel.c
@@ -3,7 +3,7 @@
*
* Copyright (C) 2007-2008 Yan Burman
* Copyright (C) 2008 Eric Piel
- * Copyright (C) 2008 Pavel Machek
+ * Copyright (C) 2008-2009 Pavel Machek
*
* 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
@@ -36,6 +36,7 @@
#include <linux/freezer.h>
#include <linux/version.h>
#include <linux/uaccess.h>
+#include <linux/leds.h>
#include <acpi/acpi_drivers.h>
#include <asm/atomic.h>
#include "lis3lv02d.h"
@@ -43,6 +44,36 @@
#define DRIVER_NAME "lis3lv02d"
#define ACPI_MDPS_CLASS "accelerometer"
+/* Delayed LEDs infrastructure ------------------------------------ */
+
+/* Special LED class that can defer work */
+struct delayed_led_classdev {
+ struct led_classdev led_classdev;
+ struct work_struct work;
+ enum led_brightness new_brightness;
+
+ unsigned int led; /* For driver */
+ void (*set_brightness)(struct delayed_led_classdev *data, enum led_brightness value);
+};
+
+static inline void delayed_set_status_worker(struct work_struct *work)
+{
+ struct delayed_led_classdev *data =
+ container_of(work, struct delayed_led_classdev, work);
+
+ data->set_brightness(data, data->new_brightness);
+}
+
+static inline void delayed_sysfs_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct delayed_led_classdev *data = container_of(led_cdev,
+ struct delayed_led_classdev, led_classdev);
+ data->new_brightness = brightness;
+ schedule_work(&data->work);
+}
+
+/* HP-specific accelerometer driver ------------------------------------ */
/* For automatic insertion of the module */
static struct acpi_device_id lis3lv02d_device_ids[] = {
@@ -154,10 +185,33 @@ static struct dmi_system_id lis3lv02d_dmi_ids[] = {
*/
};
+static void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness value)
+{
+ acpi_handle handle = adev.device->handle;
+ unsigned long long ret; /* Not used when writing */
+ union acpi_object in_obj[1];
+ struct acpi_object_list args = { 1, in_obj };
+
+ in_obj[0].type = ACPI_TYPE_INTEGER;
+ in_obj[0].integer.value = !!value;
+
+ acpi_evaluate_integer(handle, "ALED", &args, &ret);
+}
+
+static struct delayed_led_classdev hpled_led = {
+ .led_classdev = {
+ .name = "hp::hddprotect",
+ .default_trigger = "none",
+ .brightness_set = delayed_sysfs_set,
+ .flags = LED_CORE_SUSPENDRESUME,
+ },
+ .set_brightness = hpled_set,
+};
static int lis3lv02d_add(struct acpi_device *device)
{
u8 val;
+ int ret;
if (!device)
return -EINVAL;
@@ -183,7 +237,19 @@ static int lis3lv02d_add(struct acpi_device *device)
adev.ac = lis3lv02d_axis_normal;
}
- return lis3lv02d_init_device(&adev);
+ INIT_WORK(&hpled_led.work, delayed_set_status_worker);
+ ret = led_classdev_register(NULL, &hpled_led.led_classdev);
+ if (ret)
+ return ret;
+
+ ret = lis3lv02d_init_device(&adev);
+ if (ret) {
+ flush_work(&hpled_led.work);
+ led_classdev_unregister(&hpled_led.led_classdev);
+ return ret;
+ }
+
+ return ret;
}
static int lis3lv02d_remove(struct acpi_device *device, int type)
@@ -194,6 +260,9 @@ static int lis3lv02d_remove(struct acpi_device *device, int type)
lis3lv02d_joystick_disable();
lis3lv02d_poweroff(device->handle);
+ flush_work(&hpled_led.work);
+ led_classdev_unregister(&hpled_led.led_classdev);
+
return lis3lv02d_remove_fs();
}
@@ -256,7 +325,7 @@ static void __exit lis3lv02d_exit_module(void)
acpi_bus_unregister_driver(&lis3lv02d_driver);
}
-MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS");
+MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS and support for disk protection LED.");
MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
MODULE_LICENSE("GPL");