linux-kernel - [RFC PATCH v3 15/18] ledtrig-blkdev: Add function to associate blkdev trigger with LED

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Message-Id: <20210819025053.222710-16-arequipeno@gmail.com>
Date:   Wed, 18 Aug 2021 21:50:50 -0500
From:   Ian Pilcher <arequipeno@...il.com>
To:     linux-block@...r.kernel.org, linux-leds@...r.kernel.org
Cc:     axboe@...nel.dk, pavel@....cz, kabel@...nel.org,
        linux-kernel@...r.kernel.org, kernelnewbies@...nelnewbies.org
Subject: [RFC PATCH v3 15/18] ledtrig-blkdev: Add function to associate blkdev trigger with LED

Allocate per-LED data structure and initialize with default values

Create /sys/class/leds/<led>/block_devices directory

Signed-off-by: Ian Pilcher <arequipeno@...il.com>
---
 drivers/leds/trigger/ledtrig-blkdev.c | 46 +++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c
index 88e2a11af1a9..b331e3f24b04 100644
--- a/drivers/leds/trigger/ledtrig-blkdev.c
+++ b/drivers/leds/trigger/ledtrig-blkdev.c
@@ -658,3 +658,49 @@ static ssize_t blkdev_mode_store(struct device *const dev,
 
 static struct device_attribute ledtrig_blkdev_attr_mode =
 	__ATTR(mode, 0644, blkdev_mode_show, blkdev_mode_store);
+
+
+/*
+ *
+ *	Associate an LED with the blkdev trigger
+ *
+ */
+
+static int blkdev_activate(struct led_classdev *const led_dev)
+{
+	struct ledtrig_blkdev_led *led;
+	int ret;
+
+	led = kmalloc(sizeof(*led), GFP_KERNEL);
+	if (led == NULL) {
+		ret = -ENOMEM;
+		goto exit_return;
+	}
+
+	led->led_dev = led_dev;
+	led->blink_msec = LEDTRIG_BLKDEV_BLINK_MSEC;
+	led->mode = LEDTRIG_BLKDEV_MODE_RW;
+	INIT_HLIST_HEAD(&led->disks);
+
+	ret = mutex_lock_interruptible(&ledtrig_blkdev_mutex);
+	if (ret != 0)
+		goto exit_free;
+
+	led->dir = blkdev_mkdir("block_devices", &led_dev->dev->kobj);
+	if (IS_ERR(led->dir)) {
+		ret = PTR_ERR(led->dir);
+		goto exit_unlock;
+	}
+
+	hlist_add_head(&led->leds_node, &ledtrig_blkdev_leds);
+	led_set_trigger_data(led_dev, led);
+	ret = 0;
+
+exit_unlock:
+	mutex_unlock(&ledtrig_blkdev_mutex);
+exit_free:
+	if (ret != 0)
+		kfree(led);
+exit_return:
+	return ret;
+}
-- 
2.31.1