#include "leds.h"
struct timer_trig_data {
+ int brightness_on; /* LED brightness during "on" period.
+ * (LED_OFF < brightness_on <= LED_FULL)
+ */
unsigned long delay_on; /* milliseconds on */
unsigned long delay_off; /* milliseconds off */
struct timer_list timer;
{
struct led_classdev *led_cdev = (struct led_classdev *) data;
struct timer_trig_data *timer_data = led_cdev->trigger_data;
- unsigned long brightness = LED_OFF;
- unsigned long delay = timer_data->delay_off;
+ unsigned long brightness;
+ unsigned long delay;
if (!timer_data->delay_on || !timer_data->delay_off) {
led_set_brightness(led_cdev, LED_OFF);
return;
}
- if (!led_cdev->brightness) {
- brightness = LED_FULL;
+ brightness = led_get_brightness(led_cdev);
+ if (!brightness) {
+ /* Time to switch the LED on. */
+ brightness = timer_data->brightness_on;
delay = timer_data->delay_on;
+ } else {
+ /* Store the current brightness value to be able
+ * to restore it when the delay_off period is over.
+ */
+ timer_data->brightness_on = brightness;
+ brightness = LED_OFF;
+ delay = timer_data->delay_off;
}
led_set_brightness(led_cdev, brightness);
mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay));
}
-static ssize_t led_delay_on_show(struct class_device *dev, char *buf)
+static ssize_t led_delay_on_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
- struct led_classdev *led_cdev = class_get_devdata(dev);
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct timer_trig_data *timer_data = led_cdev->trigger_data;
- sprintf(buf, "%lu\n", timer_data->delay_on);
-
- return strlen(buf) + 1;
+ return sprintf(buf, "%lu\n", timer_data->delay_on);
}
-static ssize_t led_delay_on_store(struct class_device *dev, const char *buf,
- size_t size)
+static ssize_t led_delay_on_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t size)
{
- struct led_classdev *led_cdev = class_get_devdata(dev);
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct timer_trig_data *timer_data = led_cdev->trigger_data;
int ret = -EINVAL;
char *after;
count++;
if (count == size) {
- timer_data->delay_on = state;
- mod_timer(&timer_data->timer, jiffies + 1);
+ if (timer_data->delay_on != state) {
+ /* the new value differs from the previous */
+ timer_data->delay_on = state;
+
+ /* deactivate previous settings */
+ del_timer_sync(&timer_data->timer);
+
+ /* try to activate hardware acceleration, if any */
+ if (!led_cdev->blink_set ||
+ led_cdev->blink_set(led_cdev,
+ &timer_data->delay_on, &timer_data->delay_off)) {
+ /* no hardware acceleration, blink via timer */
+ mod_timer(&timer_data->timer, jiffies + 1);
+ }
+ }
ret = count;
}
return ret;
}
-static ssize_t led_delay_off_show(struct class_device *dev, char *buf)
+static ssize_t led_delay_off_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
- struct led_classdev *led_cdev = class_get_devdata(dev);
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct timer_trig_data *timer_data = led_cdev->trigger_data;
- sprintf(buf, "%lu\n", timer_data->delay_off);
-
- return strlen(buf) + 1;
+ return sprintf(buf, "%lu\n", timer_data->delay_off);
}
-static ssize_t led_delay_off_store(struct class_device *dev, const char *buf,
- size_t size)
+static ssize_t led_delay_off_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t size)
{
- struct led_classdev *led_cdev = class_get_devdata(dev);
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct timer_trig_data *timer_data = led_cdev->trigger_data;
int ret = -EINVAL;
char *after;
count++;
if (count == size) {
- timer_data->delay_off = state;
- mod_timer(&timer_data->timer, jiffies + 1);
+ if (timer_data->delay_off != state) {
+ /* the new value differs from the previous */
+ timer_data->delay_off = state;
+
+ /* deactivate previous settings */
+ del_timer_sync(&timer_data->timer);
+
+ /* try to activate hardware acceleration, if any */
+ if (!led_cdev->blink_set ||
+ led_cdev->blink_set(led_cdev,
+ &timer_data->delay_on, &timer_data->delay_off)) {
+ /* no hardware acceleration, blink via timer */
+ mod_timer(&timer_data->timer, jiffies + 1);
+ }
+ }
ret = count;
}
return ret;
}
-static CLASS_DEVICE_ATTR(delay_on, 0644, led_delay_on_show,
- led_delay_on_store);
-static CLASS_DEVICE_ATTR(delay_off, 0644, led_delay_off_show,
- led_delay_off_store);
+static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
+static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
static void timer_trig_activate(struct led_classdev *led_cdev)
{
if (!timer_data)
return;
+ timer_data->brightness_on = led_get_brightness(led_cdev);
+ if (timer_data->brightness_on == LED_OFF)
+ timer_data->brightness_on = led_cdev->max_brightness;
led_cdev->trigger_data = timer_data;
init_timer(&timer_data->timer);
timer_data->timer.function = led_timer_function;
timer_data->timer.data = (unsigned long) led_cdev;
- rc = class_device_create_file(led_cdev->class_dev,
- &class_device_attr_delay_on);
- if (rc) goto err_out;
- rc = class_device_create_file(led_cdev->class_dev,
- &class_device_attr_delay_off);
- if (rc) goto err_out_delayon;
+ rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
+ if (rc)
+ goto err_out;
+ rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
+ if (rc)
+ goto err_out_delayon;
+
+ /* If there is hardware support for blinking, start one
+ * user friendly blink rate chosen by the driver.
+ */
+ if (led_cdev->blink_set)
+ led_cdev->blink_set(led_cdev,
+ &timer_data->delay_on, &timer_data->delay_off);
return;
err_out_delayon:
- class_device_remove_file(led_cdev->class_dev,
- &class_device_attr_delay_on);
+ device_remove_file(led_cdev->dev, &dev_attr_delay_on);
err_out:
led_cdev->trigger_data = NULL;
kfree(timer_data);
static void timer_trig_deactivate(struct led_classdev *led_cdev)
{
struct timer_trig_data *timer_data = led_cdev->trigger_data;
+ unsigned long on = 0, off = 0;
if (timer_data) {
- class_device_remove_file(led_cdev->class_dev,
- &class_device_attr_delay_on);
- class_device_remove_file(led_cdev->class_dev,
- &class_device_attr_delay_off);
+ device_remove_file(led_cdev->dev, &dev_attr_delay_on);
+ device_remove_file(led_cdev->dev, &dev_attr_delay_off);
del_timer_sync(&timer_data->timer);
kfree(timer_data);
}
+
+ /* If there is hardware support for blinking, stop it */
+ if (led_cdev->blink_set)
+ led_cdev->blink_set(led_cdev, &on, &off);
}
static struct led_trigger timer_led_trigger = {
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff