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Date: Fri, 20 Nov 2009 21:46:13 +0100
From: Pavel Machek <pavel@....cz>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Samuel Thibault <samuel.thibault@...-lyon.org>,
Alexey Dobriyan <adobriyan@...il.com>,
akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
alan@...rguk.ukuu.org.uk, mgarski@...t.pl
Subject: Re: [PATCH] kbd: (#7063) make CapsLock work as expected even for
non-ASCII
Hi!
> > > So we agree, and so the right solution is to either completely rework
> > > the interface (ugh), or just add LED routing (which can be very useful,
> > > actually, I for instance don't care at all about the num lock state, but
> > > I _do_ care about the lock that lets me shift between different keyboard
> > > layouts).
> > >
> >
> > Adding LED routing and using keyboard levels is so clearly The Right Thing.
> >
> > We already allow the LEDs to be programmed; we should probably just
> > have, for each LED, the ability to program it off/on/flashing/connected
> > to modifier #X.
> >
> > The current KDSETLED/KDGETLED interface is of course too limited for
> > this -- we need an interface with at least a byte per LED.
>
> Actually, we already have very nice /sys/class/led interface, and we
> should just use it for keyboard leds, too. Actually I have a patch,
> somewhere...
Like this... But it should probably be slightly more complex -- like
making numlock/capslock/scrollock leds into trigers, and then
move input LED lowlevels into drivers/led...
Signed-off-by: Pavel Machek <pavel@....cz> (but...)
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index e4f599f..c80fee8 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -96,6 +96,13 @@ config LEDS_COBALT_RAQ
help
This option enables support for the Cobalt Raq series LEDs.
+config LEDS_INPUT
+ tristate "LED Support for input layer keyboards"
+ depends on LEDS_CLASS
+ help
+ This option enables support for LEDs on keyboards handled by
+ input layer.
+
config LEDS_SUNFIRE
tristate "LED support for SunFire servers."
depends on LEDS_CLASS && SPARC64
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 46d7270..71bde81 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o
obj-$(CONFIG_LEDS_ALIX2) += leds-alix2.o
obj-$(CONFIG_LEDS_H1940) += leds-h1940.o
+obj-$(CONFIG_LEDS_INPUT) += leds-input.o
obj-$(CONFIG_LEDS_COBALT_QUBE) += leds-cobalt-qube.o
obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-cobalt-raq.o
obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunfire.o
diff --git a/drivers/leds/leds-input.c b/drivers/leds/leds-input.c
new file mode 100644
index 0000000..8ffb4fc
--- /dev/null
+++ b/drivers/leds/leds-input.c
@@ -0,0 +1,151 @@
+/*
+ * LED <-> input subsystem glue
+ *
+ * Copyright 2007 Pavel Machek <pavel@....cz>
+ * Copyright 2007 Dmitry Torokhov
+ * Copyright 2005-2006 Openedhand Ltd.
+ *
+ * Author: Pavel Machek <pavel@....cz>
+ * Based on code by: Richard Purdie <rpurdie@...nedhand.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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/init.h>
+
+struct blinker {
+ struct work_struct work;
+ struct input_handle handle;
+ int state;
+
+ struct led_classdev dev;
+};
+
+struct blinker *blinker;
+
+static void inputled_set(struct led_classdev *led_cdev, enum led_brightness value)
+{
+ struct blinker *blinker = container_of(led_cdev, struct blinker, dev);
+ blinker->state = value;
+ schedule_work(&blinker->work);
+}
+
+static void blink_task_handler(struct work_struct *work)
+{
+ struct blinker *blinker = container_of(work, struct blinker, work);
+ input_inject_event(&blinker->handle, EV_LED, LED_CAPSL, !!blinker->state);
+}
+
+static void blink_event(struct input_handle *handle, unsigned int type,
+ unsigned int code, int down)
+{
+ /*
+ * This is a very rare handler that does not process any input
+ * events; just injects them.
+ */
+}
+
+static int blink_connect(struct input_handler *handler, struct input_dev *dev,
+ const struct input_device_id *id)
+{
+ struct input_handle *handle;
+ struct led_classdev *led_dev;
+ static int counter;
+ int error;
+
+ blinker = kzalloc(sizeof(struct blinker), GFP_KERNEL);
+ if (!blinker) {
+ return -ENOMEM;
+ }
+
+ INIT_WORK(&blinker->work, blink_task_handler);
+
+ led_dev = &blinker->dev;
+ led_dev->name = kmalloc(10, GFP_KERNEL);
+ sprintf(led_dev->name, "input%d", counter++);
+ led_dev->brightness_set = inputled_set;
+
+ handle = &blinker->handle;
+ handle->dev = dev;
+ handle->handler = handler;
+ handle->name = "blink";
+ handle->private = blinker;
+
+ error = input_register_handle(handle);
+ if (error)
+ goto err_free_handle;
+
+ error = input_open_device(handle);
+ if (error)
+ goto err_unregister_handle;
+
+ error = led_classdev_register(NULL, led_dev);
+ if (error < 0)
+ goto err_input_close_device;
+
+ return 0;
+
+ err_input_close_device:
+ input_close_device(handle);
+ err_unregister_handle:
+ input_unregister_handle(handle);
+ err_free_handle:
+ kfree(handle);
+ return error;
+}
+
+static void blink_disconnect(struct input_handle *handle)
+{
+ struct blinker *blinker = handle->private;
+
+ led_classdev_unregister(&blinker->dev);
+ input_close_device(handle);
+ input_unregister_handle(handle);
+ kfree(blinker);
+}
+
+static const struct input_device_id blink_ids[] = {
+ {
+ .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_LEDBIT,
+ .evbit = { BIT(EV_LED) },
+ .ledbit = { [LED_CAPSL] = BIT(LED_CAPSL) },
+ },
+ { }
+};
+
+static struct input_handler blink_handler = {
+ .event = blink_event,
+ .connect = blink_connect,
+ .disconnect = blink_disconnect,
+ .name = "blink",
+ .id_table = blink_ids,
+};
+
+static int __init blink_handler_init(void)
+{
+ return input_register_handler(&blink_handler);
+}
+
+static void __exit blink_handler_exit(void)
+{
+ input_unregister_handler(&blink_handler);
+ flush_scheduled_work();
+}
+
+module_init(blink_handler_init);
+module_exit(blink_handler_exit);
+
+
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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