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Date: Thu, 14 Oct 2010 21:31:14 +0200
From: Peter Korsgaard <peter.korsgaard@...esi-usa.com>
To: rpurdie@...ys.net, linux-kernel@...r.kernel.org,
akpm@...ux-foundation.org
Cc: Peter Korsgaard <peter.korsgaard@...esi-usa.com>
Subject: [PATCH] leds: add led trigger for input subsystem led events
Add a LED trigger for the numlock/capslock/scrolllock states of the
input subsystem. This is handy for devices like the Efika smartbook [1],
which uses a standard USB HID keyboard, but keyboard LEDs are connected
directly to GPIOs, or for any other situation where you want to show
num/caps/scrolllock state on LED subsystem LEDs.
[1] http://www.genesi-usa.com/products/smartbook
Signed-off-by: Peter Korsgaard <peter.korsgaard@...esi-usa.com>
---
drivers/leds/Kconfig | 7 ++
drivers/leds/Makefile | 1 +
drivers/leds/ledtrig-input.c | 165 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 173 insertions(+), 0 deletions(-)
create mode 100644 drivers/leds/ledtrig-input.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index e411262..92b4af1 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -373,6 +373,13 @@ config LEDS_TRIGGER_DEFAULT_ON
This allows LEDs to be initialised in the ON state.
If unsure, say Y.
+config LEDS_TRIGGER_INPUT
+ tristate "Input subsystem LEDs Trigger"
+ depends on INPUT
+ help
+ This allows LEDs to be controlled according to the state of
+ the input subsystem LEDs (capslock/numlock/scrolllock/..)
+
comment "iptables trigger is under Netfilter config (LED target)"
depends on LEDS_TRIGGERS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 7d6b958..f6b7645 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -49,3 +49,4 @@ obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT) += ledtrig-heartbeat.o
obj-$(CONFIG_LEDS_TRIGGER_BACKLIGHT) += ledtrig-backlight.o
obj-$(CONFIG_LEDS_TRIGGER_GPIO) += ledtrig-gpio.o
obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON) += ledtrig-default-on.o
+obj-$(CONFIG_LEDS_TRIGGER_INPUT) += ledtrig-input.o
diff --git a/drivers/leds/ledtrig-input.c b/drivers/leds/ledtrig-input.c
new file mode 100644
index 0000000..e4eae2b
--- /dev/null
+++ b/drivers/leds/ledtrig-input.c
@@ -0,0 +1,165 @@
+/*
+ * led trigger for input subsystem led states
+ *
+ * Peter Korsgaard <peter.korsgaard@...esi-usa.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include "leds.h"
+
+struct input_trig {
+ int value; /* current value of input LED */
+ struct work_struct work;
+ struct led_trigger trig;
+};
+
+static int trig_connect(struct input_handler *handler, struct input_dev *dev,
+ const struct input_device_id *id)
+{
+ struct input_handle *handle;
+ int error;
+
+ handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
+ if (!handle)
+ return -ENOMEM;
+
+ handle->dev = dev;
+ handle->handler = handler;
+ handle->name = "ledtrig-input";
+
+ error = input_register_handle(handle);
+ if (error)
+ goto err_free_handle;
+
+ error = input_open_device(handle);
+ if (error)
+ goto err_unregister_handle;
+
+ return 0;
+
+ err_unregister_handle:
+ input_unregister_handle(handle);
+ err_free_handle:
+ kfree(handle);
+ return error;
+}
+
+static void trig_disconnect(struct input_handle *handle)
+{
+ input_close_device(handle);
+ input_unregister_handle(handle);
+ kfree(handle);
+}
+
+static void trig_activate(struct led_classdev *led_cdev)
+{
+ struct input_trig *input = container_of(led_cdev->trigger,
+ struct input_trig, trig);
+
+ led_set_brightness(led_cdev, input->value ? LED_FULL : LED_OFF);
+}
+
+static struct input_trig trig[] = {
+ [LED_NUML] = {
+ .trig = {
+ .name = "numlock",
+ .activate = trig_activate,
+ },
+ },
+ [LED_CAPSL] = {
+ .trig = {
+ .name = "capslock",
+ .activate = trig_activate,
+ }
+ },
+ [LED_SCROLLL] = {
+ .trig = {
+ .name = "scrolllock",
+ .activate = trig_activate,
+ },
+ },
+};
+
+static void trig_event(struct input_handle *handle, unsigned int type,
+ unsigned int code, int value)
+{
+ if (type == EV_LED && code < ARRAY_SIZE(trig)) {
+ if (value != trig[code].value) {
+ trig[code].value = value;
+ schedule_work(&trig[code].work);
+ }
+ }
+}
+
+static const struct input_device_id trig_ids[] = {
+ {
+ .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+ .evbit = { BIT_MASK(EV_LED) },
+ },
+ { }, /* Terminating zero entry */
+};
+MODULE_DEVICE_TABLE(input, trig_ids);
+
+static struct input_handler trig_handler = {
+ .event = trig_event,
+ .connect = trig_connect,
+ .disconnect = trig_disconnect,
+ .name = "ledtrig-input",
+ .id_table = trig_ids,
+};
+
+static void trig_work(struct work_struct *work)
+{
+ struct input_trig *input = container_of(work, struct input_trig, work);
+
+ led_trigger_event(&input->trig, input->value ? LED_FULL : LED_OFF);
+}
+
+static int __init trig_init(void)
+{
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(trig); i++) {
+ INIT_WORK(&trig[i].work, trig_work);
+ ret = led_trigger_register(&trig[i].trig);
+ if (ret)
+ goto trig_reg_fail;
+ }
+
+ ret = input_register_handler(&trig_handler);
+ if (!ret)
+ return 0;
+
+ trig_reg_fail:
+ for (; i > 0; i--)
+ led_trigger_unregister(&trig[i-1].trig);
+
+ return ret;
+}
+module_init(trig_init);
+
+static void __exit trig_exit(void)
+{
+ int i;
+
+ input_unregister_handler(&trig_handler);
+
+ for (i = 0; i < ARRAY_SIZE(trig); i++) {
+ cancel_work_sync(&trig[i].work);
+ led_trigger_unregister(&trig[i].trig);
+ }
+}
+module_exit(trig_exit);
+
+MODULE_AUTHOR("Peter Korsgaard <peter.korsgaard@...esi-usa.com>");
+MODULE_DESCRIPTION("LED trigger for input subsystem LEDs");
+MODULE_LICENSE("GPL");
--
1.7.1
--
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