[PATCH 07/18] ledtrig-blkdev: Add constants, data types, and global variables

Ian Pilcher
2021-09-03T20:46:06Z

Signed-off-by: Ian Pilcher <arequipeno@gmail.com>
---
drivers/leds/trigger/ledtrig-blkdev.c | 52 +++++++++++++++++++++++++++
1 file changed, 52 insertions(+)

diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c
index 8cbeb80697ae..db8326874400 100644
--- a/drivers/leds/trigger/ledtrig-blkdev.c
+++ b/drivers/leds/trigger/ledtrig-blkdev.c
@@ -14,3 +14,55 @@ MODULE_DESCRIPTION("Block device LED trigger");
MODULE_AUTHOR("Ian Pilcher <arequipeno@gmail.com>");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(LEDTRIG_BLKDEV);
+
+/* 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; /* blkdev_leds 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);
+
+/* 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