/sys/class/leds/<led>/blink_time controls - per-LED blink duration
/sys/class/leds/<led>/interval - global frequency with which devices
are checked for activity and LEDs are blinked
/sys/class/leds/<led>/mode - blink LED for reads, writes, or both
When showing mode, show all modes with current value in square brackets
Signed-off-by: Ian Pilcher <arequipeno@xxxxxxxxx>
---
drivers/leds/trigger/ledtrig-blkdev.c | 132 ++++++++++++++++++++++++++
1 file changed, 132 insertions(+)
diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c
index c7e101935bf6..4b88f877ee81 100644
--- a/drivers/leds/trigger/ledtrig-blkdev.c
+++ b/drivers/leds/trigger/ledtrig-blkdev.c
@@ -462,6 +462,135 @@ static void blkdev_deactivate(struct led_classdev *const led_dev)
}
+/*
+ *
+ * blink_time sysfs attribute
+ *
+ */
+
+static ssize_t blink_time_show(struct device *const dev,
+ struct device_attribute *const attr,
+ char *const buf)
+{
+ const struct ledtrig_blkdev_led *const led =
+ led_trigger_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", READ_ONCE(led->blink_msec));
+}
+
+static ssize_t blink_time_store(struct device *const dev,
+ struct device_attribute *const attr,
+ const char *const buf, const size_t count)
+{
+ struct ledtrig_blkdev_led *const led = led_trigger_get_drvdata(dev);
+ unsigned int value;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &value);
+ if (ret != 0)
+ return ret;
+
+ if (value < LEDTRIG_BLKDEV_MIN_BLINK)
+ return -ERANGE;
+
+ WRITE_ONCE(led->blink_msec, value);
+ return count;
+}
+
+static DEVICE_ATTR_RW(blink_time);
+
+
+/*
+ *
+ * interval sysfs attribute - affects all LEDS
+ *
+ */
+
+static ssize_t interval_show(struct device *const dev,
+ struct device_attribute *const attr,
+ char *const buf)
+{
+ return sprintf(buf, "%u\n",
+ jiffies_to_msecs(READ_ONCE(ledtrig_blkdev_interval)));
+}
+
+static ssize_t interval_store(struct device *const dev,
+ struct device_attribute *const attr,
+ const char *const buf, const size_t count)
+{
+ unsigned int value;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &value);
+ if (ret != 0)
+ return ret;
+
+ if (value < LEDTRIG_BLKDEV_MIN_INT)
+ return -ERANGE;
+
+ WRITE_ONCE(ledtrig_blkdev_interval, msecs_to_jiffies(value));
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(interval);
+
+
+/*
+ *
+ * mode sysfs attribute - blink for reads, writes, or both
+ *
+ */
+
+static const struct {
+ const char *name;
+ const char *show;
+} blkdev_modes[] = {
+ [LEDTRIG_BLKDEV_MODE_RO] = {
+ .name = "read",
+ .show = "[read] write rw\n",
+ },
+ [LEDTRIG_BLKDEV_MODE_WO] = {
+ .name = "write",
+ .show = "read [write] rw\n",
+ },
+ [LEDTRIG_BLKDEV_MODE_RW] = {
+ .name = "rw",
+ .show = "read write [rw]\n",
+ },
+};
+
+static ssize_t mode_show(struct device *const dev,
+ struct device_attribute *const attr, char *const buf)
+{
+ const struct ledtrig_blkdev_led *const led =
+ led_trigger_get_drvdata(dev);
+
+ return sprintf(buf, blkdev_modes[READ_ONCE(led->mode)].show);
+}
+
+static ssize_t mode_store(struct device *const dev,
+ struct device_attribute *const attr,
+ const char *const buf, const size_t count)
+{
+ struct ledtrig_blkdev_led *const led = led_trigger_get_drvdata(dev);
+ enum ledtrig_blkdev_mode mode;
+
+ for (mode = LEDTRIG_BLKDEV_MODE_RO;
+ mode <= LEDTRIG_BLKDEV_MODE_RW; ++mode) {
+
+ if (sysfs_streq(blkdev_modes[mode].name, buf)) {
+ WRITE_ONCE(led->mode, mode);
+ return count;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static DEVICE_ATTR_RW(mode);
+
+
/*
*
* Initialization - register the trigger
@@ -471,6 +600,9 @@ static void blkdev_deactivate(struct led_classdev *const led_dev)
static struct attribute *ledtrig_blkdev_attrs[] = {
&dev_attr_link_device.attr,
&dev_attr_unlink_device.attr,
+ &dev_attr_blink_time.attr,
+ &dev_attr_interval.attr,
+ &dev_attr_mode.attr,
NULL
};
--
2.31.1
