From: Ian Pilcher <arequipeno@gmail.com>
To: axboe@kernel.dk, pavel@ucw.cz
Cc: linux-leds@vger.kernel.org, linux-block@vger.kernel.org,
linux@vger.kernel.org, gregkh@linuxfoundation.org,
kabel@kernel.org
Subject: [PATCH 16/18] ledtrig-blkdev: Add blink_time & interval sysfs attributes
Date: Fri, 3 Sep 2021 15:45:46 -0500 [thread overview]
Message-ID: <20210903204548.2745354-17-arequipeno@gmail.com> (raw)
In-Reply-To: <20210903204548.2745354-1-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 db82d37fc721..b23a5c98de98 100644
--- a/drivers/leds/trigger/ledtrig-blkdev.c
+++ b/drivers/leds/trigger/ledtrig-blkdev.c
@@ -557,3 +557,66 @@ 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
next prev parent reply other threads:[~2021-09-03 20:46 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-03 20:45 [PATCH 00/18] Introduce block device LED trigger Ian Pilcher
2021-09-03 20:45 ` [PATCH 01/18] docs: Add block device (blkdev) LED trigger documentation Ian Pilcher
2021-09-04 6:29 ` Pavel Machek
2021-09-05 14:49 ` Ian Pilcher
2021-09-05 18:42 ` Pavel Machek
2021-09-05 23:13 ` Ian Pilcher
2021-09-03 20:45 ` [PATCH 02/18] ledtrig-blkdev: Add build infra for block device LED trigger Ian Pilcher
2021-09-03 20:45 ` [PATCH 03/18] ledtrig-blkdev: Add function placeholders needed by block changes Ian Pilcher
2021-09-04 16:57 ` kernel test robot
2021-09-03 20:45 ` [PATCH 04/18] block: Add block device LED trigger integrations Ian Pilcher
2021-09-03 20:45 ` [PATCH 05/18] ledtrig-blkdev: Implement functions called from block subsystem Ian Pilcher
2021-09-03 20:45 ` [PATCH 06/18] ledtrig-blkdev: Add function to get gendisk by name Ian Pilcher
2021-09-03 20:45 ` [PATCH 07/18] ledtrig-blkdev: Add constants, data types, and global variables Ian Pilcher
2021-09-03 20:45 ` [PATCH 08/18] ledtrig-blkdev: Add miscellaneous helper functions Ian Pilcher
2021-09-04 6:00 ` Greg KH
2021-09-04 22:43 ` Ian Pilcher
2021-09-03 20:45 ` [PATCH 09/18] ledtrig-blkdev: Periodically check devices for activity & blink LEDs Ian Pilcher
2021-09-04 6:01 ` Greg KH
2021-09-05 14:39 ` Ian Pilcher
2021-09-05 14:51 ` Greg KH
2021-09-05 14:56 ` Ian Pilcher
2021-09-05 15:12 ` Greg KH
2021-09-05 16:55 ` Eric Biggers
2021-09-03 20:45 ` [PATCH 10/18] ledtrig-blkdev: Add function to associate the trigger with an LED Ian Pilcher
2021-09-03 20:45 ` [PATCH 11/18] ledtrig-blkdev: Add function to associate a device " Ian Pilcher
2021-09-03 20:45 ` [PATCH 12/18] ledtrig-blkdev: Add function to remove LED/device association Ian Pilcher
2021-09-03 20:45 ` [PATCH 13/18] ledtrig-blkdev: Add function to disassociate a device from all LEDs Ian Pilcher
2021-09-03 20:45 ` [PATCH 14/18] ledtrig-blkdev: Add function to disassociate an LED from the trigger Ian Pilcher
2021-09-03 20:45 ` [PATCH 15/18] ledtrig-blkdev: Add sysfs attributes to [un]link LEDs & devices Ian Pilcher
2021-09-04 5:57 ` Greg KH
2021-09-04 21:28 ` Ian Pilcher
2021-09-04 5:59 ` Greg KH
2021-09-04 22:35 ` Ian Pilcher
2021-09-05 14:51 ` Greg KH
2021-09-05 15:33 ` Ian Pilcher
2021-09-05 16:43 ` Greg KH
2021-09-03 20:45 ` Ian Pilcher [this message]
2021-09-03 20:45 ` [PATCH 17/18] ledtrig-blkdev: Add mode (read/write/rw) sysfs attributue Ian Pilcher
2021-09-04 5:57 ` Greg KH
2021-09-04 21:01 ` Ian Pilcher
2021-09-05 14:50 ` Greg KH
2021-09-03 20:45 ` [PATCH 18/18] ledtrig-blkdev: Add initialization & exit functions Ian Pilcher
2021-09-04 6:35 ` [PATCH 00/18] Introduce block device LED trigger Pavel Machek
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