this patch is to provide for an initial implementation of a generic EV_LED handler which supports LED triggers in the leds subsystem.
Signed-off-by: David Anders <danders at amltd.com>
diff -urN linux-2.6.27-clean/drivers/input/generic-leds.c linux-2.6.27/drivers/input/generic-leds.c
--- linux-2.6.27-clean/drivers/input/generic-leds.c 1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.27/drivers/input/generic-leds.c 2008-11-05 10:27:06.000000000 -0600
@@ -0,0 +1,116 @@
+/*
+ * Generic Leds Event
+ *
+ * Copyright (c) 2008 David Anders
+ *
+ * Based on the Input Power Event -> APM Bridge
+ *
+ * Copyright (c) 2007 Richard Purdie
+ *
+ * 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/input.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/tty.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/leds.h>
+
+static void generic_leds_event(struct input_handle *handle, unsigned int type,
+ unsigned int code, int value)
+{
+ switch (type) {
+ case EV_LED:
+ ledtrig_ev_led_activity(value);
+ break;
+
+ default:
+ break;
+ }
+}
+
+static int generic_leds_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 = "generic-leds";
+
+ error = input_register_handle(handle);
+ if (error) {
+ printk(KERN_ERR
+ "generic-leds: Failed to register generic-leds handler,"
+ " error %d\n", error);
+ kfree(handle);
+ return error;
+ }
+
+ error = input_open_device(handle);
+ if (error) {
+ printk(KERN_ERR
+ "generic-leds: Failed to open generic-leds device,"
+ " error %d\n", error);
+ input_unregister_handle(handle);
+ kfree(handle);
+ return error;
+ }
+
+ return 0;
+}
+
+static void generic_leds_disconnect(struct input_handle *handle)
+{
+ input_close_device(handle);
+ input_unregister_handle(handle);
+ kfree(handle);
+}
+
+static const struct input_device_id generic_leds_ids[] = {
+ {
+ .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+ .evbit = { BIT_MASK(EV_LED) },
+ },
+ { },
+};
+
+MODULE_DEVICE_TABLE(input, generic_leds_ids);
+
+
+static struct input_handler generic_leds_handler = {
+ .event = generic_leds_event,
+ .connect = generic_leds_connect,
+ .disconnect = generic_leds_disconnect,
+ .name = "generic-leds",
+ .id_table = generic_leds_ids,
+};
+
+static int __init generic_leds_init(void)
+{
+ return input_register_handler(&generic_leds_handler);
+}
+
+static void __exit generic_leds_exit(void)
+{
+ input_unregister_handler(&generic_leds_handler);
+}
+
+module_init(generic_leds_init);
+module_exit(generic_leds_exit);
+
+MODULE_AUTHOR("David Anders <danders@xxxxxxxxx>");
+MODULE_DESCRIPTION("Generic Led Events");
+MODULE_LICENSE("GPL");
diff -urN linux-2.6.27-clean/drivers/input/Kconfig linux-2.6.27/drivers/input/Kconfig
--- linux-2.6.27-clean/drivers/input/Kconfig 2008-11-05 08:26:48.000000000 -0600
+++ linux-2.6.27/drivers/input/Kconfig 2008-11-05 11:24:57.000000000 -0600
@@ -52,6 +52,15 @@
To compile this driver as a module, choose M here: the
module will be called input-polldev.
+config INPUT_GENERICLEDS
+ tristate "Generic LED Handler"
+ depends on INPUT
+ ---help---
+ Say Y here if you want LED events to be passed to the
+ leds subsystem as a trigger. This is useful on embedded
+ systems where such behviour is desired without userspace
+ interaction. If unsure, say N.
+
comment "Userland interfaces"
config INPUT_MOUSEDEV
diff -urN linux-2.6.27-clean/drivers/input/Makefile linux-2.6.27/drivers/input/Makefile
--- linux-2.6.27-clean/drivers/input/Makefile 2008-11-05 08:26:49.000000000 -0600
+++ linux-2.6.27/drivers/input/Makefile 2008-11-05 10:17:00.000000000 -0600
@@ -9,6 +9,7 @@
obj-$(CONFIG_INPUT_FF_MEMLESS) += ff-memless.o
obj-$(CONFIG_INPUT_POLLDEV) += input-polldev.o
+obj-$(CONFIG_INPUT_GENERICLEDS) += generic-leds.o
obj-$(CONFIG_INPUT_MOUSEDEV) += mousedev.o
obj-$(CONFIG_INPUT_JOYDEV) += joydev.o
diff -urN linux-2.6.27-clean/drivers/leds/Kconfig linux-2.6.27/drivers/leds/Kconfig
--- linux-2.6.27-clean/drivers/leds/Kconfig 2008-11-05 08:27:05.000000000 -0600
+++ linux-2.6.27/drivers/leds/Kconfig 2008-11-05 11:14:02.000000000 -0600
@@ -172,6 +172,13 @@
These triggers allow kernel events to drive the LEDs and can
be configured via sysfs. If unsure, say Y.
+config LEDS_TRIGGER_EV_LED
+ tristate "EV_LED Input Trigger"
+ depends on LEDS_TRIGGERS
+ help
+ This allows LEDs to be controlled by the use of the EV_LED
+ events from the input system.
+
config LEDS_TRIGGER_TIMER
tristate "LED Timer Trigger"
depends on LEDS_TRIGGERS
diff -urN linux-2.6.27-clean/drivers/leds/ledtrig-ev-led.c linux-2.6.27/drivers/leds/ledtrig-ev-led.c
--- linux-2.6.27-clean/drivers/leds/ledtrig-ev-led.c 1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.27/drivers/leds/ledtrig-ev-led.c 2008-11-05 11:27:32.000000000 -0600
@@ -0,0 +1,55 @@
+/*
+ * EV_LED event LED Trigger
+ *
+ * Copyright 2008 David Anders
+ *
+ * Author: David Anders <danders@xxxxxxxxx>
+ *
+ * Based on the LED IDE-Disk Activity Trigger - ledtrig-ide-disk.c
+ *
+ * Copyright 2006 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@xxxxxxxxxxxxxx>
+ *
+ * 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/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/leds.h>
+
+DEFINE_LED_TRIGGER(ledtrig_ev_led);
+
+void ledtrig_ev_led_activity(int value)
+{
+ if (!value)
+ led_trigger_event(ledtrig_ev_led, LED_FULL);
+ else
+ led_trigger_event(ledtrig_ev_led, LED_OFF);
+
+}
+EXPORT_SYMBOL(ledtrig_ev_led_activity);
+
+static int __init ledtrig_ev_led_init(void)
+{
+ led_trigger_register_simple("ev-led", &ledtrig_ev_led);
+ return 0;
+}
+
+static void __exit ledtrig_ev_led_exit(void)
+{
+ led_trigger_unregister_simple(ledtrig_ev_led);
+}
+
+module_init(ledtrig_ev_led_init);
+module_exit(ledtrig_ev_led_exit);
+
+MODULE_AUTHOR("David Anders <danders@xxxxxxxxx");
+MODULE_DESCRIPTION("EV_LED Input LED Trigger");
+MODULE_LICENSE("GPL");
diff -urN linux-2.6.27-clean/drivers/leds/Makefile linux-2.6.27/drivers/leds/Makefile
--- linux-2.6.27-clean/drivers/leds/Makefile 2008-11-05 08:27:05.000000000 -0600
+++ linux-2.6.27/drivers/leds/Makefile 2008-11-05 11:12:17.000000000 -0600
@@ -25,6 +25,7 @@
obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o
# LED Triggers
+obj-$(CONFIG_LEDS_TRIGGER_EV_LED) += ledtrig-ev-led.o
obj-$(CONFIG_LEDS_TRIGGER_TIMER) += ledtrig-timer.o
obj-$(CONFIG_LEDS_TRIGGER_IDE_DISK) += ledtrig-ide-disk.o
obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT) += ledtrig-heartbeat.o
diff -urN linux-2.6.27-clean/include/linux/leds.h linux-2.6.27/include/linux/leds.h
--- linux-2.6.27-clean/include/linux/leds.h 2008-11-05 08:26:39.000000000 -0600
+++ linux-2.6.27/include/linux/leds.h 2008-11-05 11:05:54.000000000 -0600
@@ -118,6 +118,12 @@
#define ledtrig_ide_activity() do {} while(0)
#endif
+#ifdef CONFIG_LEDS_TRIGGER_EV_LED
+extern void ledtrig_ev_led_activity(void);
+#else
+#define ledtrig_ev_led_activity() do {} while (0)
+#endif
+
/*
* Generic LED platform data for describing LED names and default triggers.
*/
--
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