linux-kernel - [RFC PATCH v2 07/10] block: Add sysfs attributes to LEDs associated with blkdev trigger

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Message-Id: <20210809033217.1113444-8-arequipeno@gmail.com>
Date:   Sun,  8 Aug 2021 22:32:14 -0500
From:   Ian Pilcher <arequipeno@...il.com>
To:     linux-block@...r.kernel.org, linux-leds@...r.kernel.org
Cc:     axboe@...nel.dk, pavel@....cz, linux-kernel@...r.kernel.org,
        kernelnewbies@...nelnewbies.org
Subject: [RFC PATCH v2 07/10] block: Add sysfs attributes to LEDs associated with blkdev trigger

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 <arequipeno@...il.com>
---
 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