linux-kernel - [PATCH v2 02/15] leds: trigger: blkdev: Add build infrastructure

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Date:   Thu,  9 Sep 2021 17:25:00 -0500
From:   Ian Pilcher <arequipeno@...il.com>
To:     axboe@...nel.dk, pavel@....cz
Cc:     linux-leds@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        kabel@...nel.org
Subject: [PATCH v2 02/15] leds: trigger: blkdev: Add build infrastructure

Add files:
  * ledtrig-blkdev-core.c - trigger components that are always built-in
  * ledtrig-blkdev.c - trigger components that can be built as a module
  * ledtrig-blkdev.h - common declarations

Add Kconfig options - CONFIG_LEDS_TRIGGER_BLKDEV (visible, tristate) and
CONFIG_LEDS_TRIGGER_BLKDEV_CORE (hidden, boolean)

Make CONFIG_LEDS_TRIGGER_BLKDEV select CONFIG_LEDS_TRIGGER_BLKDEV_CORE, so
built-in portion of the trigger is enabled when trigger is either built-in
or modular

Signed-off-by: Ian Pilcher <arequipeno@...il.com>
---
 drivers/leds/trigger/Kconfig               | 18 ++++++++++++++++++
 drivers/leds/trigger/Makefile              |  2 ++
 drivers/leds/trigger/ledtrig-blkdev-core.c |  9 +++++++++
 drivers/leds/trigger/ledtrig-blkdev.c      | 16 ++++++++++++++++
 drivers/leds/trigger/ledtrig-blkdev.h      | 12 ++++++++++++
 5 files changed, 57 insertions(+)
 create mode 100644 drivers/leds/trigger/ledtrig-blkdev-core.c
 create mode 100644 drivers/leds/trigger/ledtrig-blkdev.c
 create mode 100644 drivers/leds/trigger/ledtrig-blkdev.h

diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig
index 1f1d57288085..ad49d92713fb 100644
--- a/drivers/leds/trigger/Kconfig
+++ b/drivers/leds/trigger/Kconfig
@@ -153,4 +153,22 @@ config LEDS_TRIGGER_TTY
 
 	  When build as a module this driver will be called ledtrig-tty.
 
+config LEDS_TRIGGER_BLKDEV
+	tristate "LED Trigger for block devices"
+	depends on BLOCK
+	select LEDS_TRIGGER_BLKDEV_CORE
+	help
+	  The blkdev LED trigger allows LEDs to be controlled by block device
+	  activity (reads and writes).
+
+	  See Documentation/leds/ledtrig-blkdev.rst.
+
+config LEDS_TRIGGER_BLKDEV_CORE
+	bool
+	depends on LEDS_TRIGGER_BLKDEV
+	help
+	  This enables the portion of the block device LED trigger that must
+	  be built-in to the kernel, even when the trigger is built as a
+	  module.
+
 endif # LEDS_TRIGGERS
diff --git a/drivers/leds/trigger/Makefile b/drivers/leds/trigger/Makefile
index 25c4db97cdd4..3732eeb86775 100644
--- a/drivers/leds/trigger/Makefile
+++ b/drivers/leds/trigger/Makefile
@@ -16,3 +16,5 @@ obj-$(CONFIG_LEDS_TRIGGER_NETDEV)	+= ledtrig-netdev.o
 obj-$(CONFIG_LEDS_TRIGGER_PATTERN)	+= ledtrig-pattern.o
 obj-$(CONFIG_LEDS_TRIGGER_AUDIO)	+= ledtrig-audio.o
 obj-$(CONFIG_LEDS_TRIGGER_TTY)		+= ledtrig-tty.o
+obj-$(CONFIG_LEDS_TRIGGER_BLKDEV)	+= ledtrig-blkdev.o
+obj-$(CONFIG_LEDS_TRIGGER_BLKDEV_CORE)	+= ledtrig-blkdev-core.o
diff --git a/drivers/leds/trigger/ledtrig-blkdev-core.c b/drivers/leds/trigger/ledtrig-blkdev-core.c
new file mode 100644
index 000000000000..bd9e5f09b7e3
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-blkdev-core.c
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ *	Block device LED trigger - built-in components
+ *
+ *	Copyright 2021 Ian Pilcher <arequipeno@...il.com>
+ */
+
+#include "ledtrig-blkdev.h"
diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c
new file mode 100644
index 000000000000..b615a8bf38e2
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-blkdev.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ *	Block device LED trigger - modular components
+ *
+ *	Copyright 2021 Ian Pilcher <arequipeno@...il.com>
+ */
+
+#include <linux/module.h>
+
+#include "ledtrig-blkdev.h"
+
+MODULE_DESCRIPTION("Block device LED trigger");
+MODULE_AUTHOR("Ian Pilcher <arequipeno@...il.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(LEDTRIG_BLKDEV);
diff --git a/drivers/leds/trigger/ledtrig-blkdev.h b/drivers/leds/trigger/ledtrig-blkdev.h
new file mode 100644
index 000000000000..6264d8a9201b
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-blkdev.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ *	Block device LED trigger
+ *
+ *	Copyright 2021 Ian Pilcher <arequipeno@...il.com>
+ */
+
+#ifndef __LEDTRIG_BLKDEV_H
+#define __LEDTRIG_BLKDEV_H
+
+#endif	/* __LEDTRIG_BLKDEV_H */
-- 
2.31.1