Add blink_on & blink_off attributes to control the duration of each LED blink
(blink_on) and the minimum time between blinks (blink_off) in milliseconds
Signed-off-by: Ian Pilcher <[email protected]>
---
block/blk-ledtrig.c | 63 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)
diff --git a/block/blk-ledtrig.c b/block/blk-ledtrig.c
index f8cb6de203f8..d02f32205985 100644
--- a/block/blk-ledtrig.c
+++ b/block/blk-ledtrig.c
@@ -343,3 +343,66 @@ static void blk_ledtrig_deactivate(struct led_classdev *const led)
synchronize_rcu();
kfree(bd_led);
}
+
+
+/*
+ *
+ * Per-LED blink_on & blink_off device attributes
+ *
+ */
+
+static ssize_t blk_ledtrig_blink_show(struct device *const dev,
+ struct device_attribute *const attr,
+ char *const buf);
+
+static ssize_t blk_ledtrig_blink_store(struct device *const dev,
+ struct device_attribute *const attr,
+ const char *const buf,
+ const size_t count);
+
+static struct device_attribute blk_ledtrig_attr_blink_on =
+ __ATTR(blink_on, 0644,
+ blk_ledtrig_blink_show, blk_ledtrig_blink_store);
+
+static struct device_attribute blk_ledtrig_attr_blink_off =
+ __ATTR(blink_off, 0644,
+ blk_ledtrig_blink_show, blk_ledtrig_blink_store);
+
+static ssize_t blk_ledtrig_blink_show(struct device *const dev,
+ struct device_attribute *const attr,
+ char *const buf)
+{
+ struct blk_ledtrig_led *const bd_led = led_trigger_get_drvdata(dev);
+ unsigned int value;
+
+ if (attr == &blk_ledtrig_attr_blink_on)
+ value = READ_ONCE(bd_led->blink_on);
+ else // attr == &blk_ledtrig_attr_blink_off
+ value = READ_ONCE(bd_led->blink_off);
+
+ return sprintf(buf, "%u\n", value);
+}
+
+static ssize_t blk_ledtrig_blink_store(struct device *const dev,
+ struct device_attribute *const attr,
+ const char *const buf,
+ const size_t count)
+{
+ struct blk_ledtrig_led *const bd_led = led_trigger_get_drvdata(dev);
+ unsigned int value;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &value);
+ if (ret != 0)
+ return ret;
+
+ if (value > BLK_LEDTRIG_BLINK_MAX)
+ return -ERANGE;
+
+ if (attr == &blk_ledtrig_attr_blink_on)
+ WRITE_ONCE(bd_led->blink_on, value);
+ else // attr == &blk_ledtrig_attr_blink_off
+ WRITE_ONCE(bd_led->blink_off, value);
+
+ return count;
+}
--
2.31.1