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SubjectRe: blink driver power saving
On 7/2/07, Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:
>
> I was thinking about something like the atached (untested and sorry
> for using attachment). It shoudl blink just one led (numLock) on any
> keyboard that has such LED (and allows to control it).
>

Argh, bad one. This one shoudl be better.

--
Dmitry
/*
* Debug driver that continuosly blink LEDs on keyboards
*
* Copyright (c) 2007 Dmitry Torokhov
*/

/*
* 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/workqueue.h>
#include <linux/init.h>

MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
MODULE_DESCRIPTION("Blink driver");
MODULE_LICENSE("GPL");

struct blinker {
struct delayed_work work;
struct input_handle handle;
int state;
};

static void blink_task_handler(struct work_struct *work)
{
struct blinker *blinker = container_of(work, struct blinker, work.work);

blinker->state = !blinker->state;
input_inject_event(&blinker->handle, EV_LED, LED_NUML, blinker->state);
schedule_delayed_work(&blinker->work, msecs_to_jiffies(250));
}

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 blinker *blinker;
struct input_handle *handle;
int error;

blinker = kzalloc(sizeof(struct blinker), GFP_KERNEL);
if (!blinker)
return -ENOMEM;

INIT_DELAYED_WORK(&blinker->work, blink_task_handler);

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;

schedule_delayed_work(&blinker->work, 0);

return 0;

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;

cancel_rearming_delayed_work(&blinker->work);
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 = { [LONG(LED_NUML)] = BIT(LED_NUML) },
},
{ }
};

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);
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