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From: Ian Pilcher <arequipeno@gmail.com>
To: linux-block@vger.kernel.org, linux-leds@vger.kernel.org
Cc: axboe@kernel.dk, pavel@ucw.cz, kabel@kernel.org,
	linux-kernel@vger.kernel.org, kernelnewbies@kernelnewbies.org
Subject: [RFC PATCH v3 13/18] ledtrig-blkdev: Add blink_time & interval sysfs attributes
Date: Wed, 18 Aug 2021 21:50:48 -0500	[thread overview]
Message-ID: <20210819025053.222710-14-arequipeno@gmail.com> (raw)
In-Reply-To: <20210819025053.222710-1-arequipeno@gmail.com>

/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

Enforce 25 millisecond minimum for both attributes

Signed-off-by: Ian Pilcher <arequipeno@gmail.com>
---
 drivers/leds/trigger/ledtrig-blkdev.c | 63 +++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c
index 15b15aefdfd8..481b2d142db2 100644
--- a/drivers/leds/trigger/ledtrig-blkdev.c
+++ b/drivers/leds/trigger/ledtrig-blkdev.c
@@ -528,3 +528,66 @@ static ssize_t blkdev_add_or_del(struct device *const dev,
 	 */
 	return blkdev_skip_space(endp) - buf;
 }
+
+
+/*
+ *
+ *	blink_time & interval device attributes
+ *
+ */
+
+static ssize_t blkdev_time_show(struct device *const dev,
+				      struct device_attribute *const attr,
+				      char *const buf);
+
+static ssize_t blkdev_time_store(struct device *const dev,
+				 struct device_attribute *const attr,
+				 const char *const buf, const size_t count);
+
+static struct device_attribute ledtrig_blkdev_attr_blink_time =
+	__ATTR(blink_time, 0644, blkdev_time_show, blkdev_time_store);
+
+static struct device_attribute ledtrig_blkdev_attr_interval =
+	__ATTR(interval, 0644, blkdev_time_show, blkdev_time_store);
+
+static ssize_t blkdev_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);
+	unsigned int value;
+
+	if (attr == &ledtrig_blkdev_attr_blink_time)
+		value = READ_ONCE(led->blink_msec);
+	else	// attr == &ledtrig_blkdev_attr_interval
+		value = jiffies_to_msecs(READ_ONCE(ledtrig_blkdev_interval));
+
+	return sprintf(buf, "%u\n", value);
+}
+
+static ssize_t blkdev_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_TIME) {
+		pr_info("blkdev LED: attempt to set time < %s milliseconds\n",
+			__stringify(LEDTRIG_BLKDEV_MIN_TIME));
+		return -ERANGE;
+	}
+
+	if (attr == &ledtrig_blkdev_attr_blink_time)
+		WRITE_ONCE(led->blink_msec, value);
+	else	// attr == &ledtrig_blkdev_attr_interval
+		WRITE_ONCE(ledtrig_blkdev_interval, msecs_to_jiffies(value));
+
+	return count;
+}
-- 
2.31.1


  parent reply	other threads:[~2021-08-19  2:51 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-19  2:50 [RFC PATCH v3 00/18] Add block device LED trigger Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 01/18] docs: Add block device (blkdev) LED trigger documentation Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 02/18] block: Add get_disk_by_name() for use by blkdev LED trigger Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 03/18] ledtrig-blkdev: Add file (ledtrig-blkdev.c) for block device " Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 04/18] ledtrig-blkdev: Add misc. helper functions to blkdev " Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 05/18] ledtrig-blkdev: Periodically check devices for activity & blink LEDs Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 06/18] block: Add LED trigger pointer to struct gendisk Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 07/18] ledtrig-blkdev: Add function to initialize gendisk ledtrig member Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 08/18] ledtrig-blkdev: Add function to remove LED/device association Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 09/18] ledtrig-blkdev: Add function to disassociate a device from all LEDs Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 10/18] block: Call LED trigger init/cleanup functions Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 11/18] ledtrig-blkdev: Add function to associate a device with an LED Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 12/18] ledtrig-blkdev: Add sysfs attributes to [dis]associate LEDs & devices Ian Pilcher
2021-08-19  2:50 ` Ian Pilcher [this message]
2021-08-19  2:50 ` [RFC PATCH v3 14/18] ledtrig-blkdev: Add mode (read/write/rw) sysfs attributue Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 15/18] ledtrig-blkdev: Add function to associate blkdev trigger with LED Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 16/18] ledtrig-blkdev: Add function to disassociate an LED from the trigger Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 17/18] ledtrig-blkdev: Add initialization function Ian Pilcher
2021-08-19  2:50 ` [RFC PATCH v3 18/18] ledtrig-blkdev: Add config option to enable the trigger Ian Pilcher

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