Add data types and global variables
Signed-off-by: Ian Pilcher <arequip...@gmail.com>
---
drivers/leds/trigger/ledtrig-blkdev.c | 66 +++++++++++++++++++++++++++
1 file changed, 66 insertions(+)
create mode 100644 drivers/leds/trigger/ledtrig-blkdev.c
diff --git a/drivers/leds/trigger/ledtrig-blkdev.c
b/drivers/leds/trigger/ledtrig-blkdev.c
new file mode 100644
index 000000000000..28ccbd7946ba
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-blkdev.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * Block device LED triggers
+ *
+ * Copyright 2021 Ian Pilcher <arequip...@gmail.com>
+ */
+
+#include <linux/leds.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+
+/* Default blink time & polling interval (milliseconds) */
+#define LEDTRIG_BLKDEV_BLINK_MSEC 75
+#define LEDTRIG_BLKDEV_INTERVAL 100
+
+/* Minimum VALUE for interval or blink_time */
+#define LEDTRIG_BLKDEV_MIN_TIME 25
+
+enum ledtrig_blkdev_mode {
+ LEDTRIG_BLKDEV_MODE_RO = 0, /* blink for reads */
+ LEDTRIG_BLKDEV_MODE_WO = 1, /* blink for writes */
+ LEDTRIG_BLKDEV_MODE_RW = 2 /* blink for reads and writes */
+};
+
+/* Trigger-specific info about a block device */
+struct ledtrig_blkdev_disk {
+ struct gendisk *gd;
+ struct kobject *dir;
+ struct hlist_head leds;
+ unsigned long read_ios;
+ unsigned long write_ios;
+ unsigned int generation;
+ bool read_act;
+ bool write_act;
+};
+
+/* For many-to-many relationships between "disks" (block devices) and LEDs */
+struct ledtrig_blkdev_link {
+ struct hlist_node disk_leds_node;
+ struct hlist_node led_disks_node;
+ struct ledtrig_blkdev_disk *disk;
+ struct ledtrig_blkdev_led *led;
+};
+
+/* Every LED associated with the blkdev trigger gets one of these */
+struct ledtrig_blkdev_led {
+ struct kobject *dir; /* block_devices dir */
+ struct led_classdev *led_dev;
+ unsigned int blink_msec;
+ struct hlist_head disks; /* linked block devs */
+ struct hlist_node leds_node;
+ enum ledtrig_blkdev_mode mode;
+};
+
+/* All LEDs associated with the trigger */
+static HLIST_HEAD(ledtrig_blkdev_leds);
+
+/* Must hold when changing trigger/LED/device associations */
+static DEFINE_MUTEX(ledtrig_blkdev_mutex);
+
+/* Total number of device-to-LED associations */
+static unsigned int ledtrig_blkdev_count;
+
+/* How often to check for drive activity - in jiffies */
+static unsigned int ledtrig_blkdev_interval;
--
2.31.1
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