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/*
* LED support for the input layer
*
* Copyright 2010-2013 Samuel Thibault <samuel.thibault@ens-lyon.org>
*
* 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/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/leds.h>
#include <linux/input.h>
/*
* Keyboard LEDs are propagated by default like the following example:
*
* VT keyboard numlock trigger
* -> vt::numl VT LED
* -> vt-numl VT trigger
* -> per-device inputX::numl LED
*
* Userland can however choose the trigger for the vt::numl LED, or
* independently choose the trigger for any inputx::numl LED.
*
*
* VT LED classes and triggers are registered on-demand according to
* existing LED devices
*/
/* Handler for VT LEDs, just triggers the corresponding VT trigger. */
static void vt_led_set(struct led_classdev *cdev,
enum led_brightness brightness);
static struct led_classdev vt_leds[LED_CNT] = {
#define DEFINE_INPUT_LED(vt_led, nam, deftrig) \
[vt_led] = { \
.name = "vt::"nam, \
.max_brightness = 1, \
.brightness_set = vt_led_set, \
.default_trigger = deftrig, \
}
/* Default triggers for the VT LEDs just correspond to the legacy
* usage. */
DEFINE_INPUT_LED(LED_NUML, "numl", "kbd-numlock"),
DEFINE_INPUT_LED(LED_CAPSL, "capsl", "kbd-capslock"),
DEFINE_INPUT_LED(LED_SCROLLL, "scrolll", "kbd-scrollock"),
DEFINE_INPUT_LED(LED_COMPOSE, "compose", NULL),
DEFINE_INPUT_LED(LED_KANA, "kana", "kbd-kanalock"),
DEFINE_INPUT_LED(LED_SLEEP, "sleep", NULL),
DEFINE_INPUT_LED(LED_SUSPEND, "suspend", NULL),
DEFINE_INPUT_LED(LED_MUTE, "mute", NULL),
DEFINE_INPUT_LED(LED_MISC, "misc", NULL),
DEFINE_INPUT_LED(LED_MAIL, "mail", NULL),
DEFINE_INPUT_LED(LED_CHARGING, "charging", NULL),
};
static const char *const vt_led_names[LED_CNT] = {
[LED_NUML] = "numl",
[LED_CAPSL] = "capsl",
[LED_SCROLLL] = "scrolll",
[LED_COMPOSE] = "compose",
[LED_KANA] = "kana",
[LED_SLEEP] = "sleep",
[LED_SUSPEND] = "suspend",
[LED_MUTE] = "mute",
[LED_MISC] = "misc",
[LED_MAIL] = "mail",
[LED_CHARGING] = "charging",
};
/* Handler for hotplug initialization */
static void vt_led_trigger_activate(struct led_classdev *cdev);
/* VT triggers */
static struct led_trigger vt_led_triggers[LED_CNT] = {
#define DEFINE_INPUT_LED_TRIGGER(vt_led, nam) \
[vt_led] = { \
.name = "vt-"nam, \
.activate = vt_led_trigger_activate, \
}
DEFINE_INPUT_LED_TRIGGER(LED_NUML, "numl"),
DEFINE_INPUT_LED_TRIGGER(LED_CAPSL, "capsl"),
DEFINE_INPUT_LED_TRIGGER(LED_SCROLLL, "scrolll"),
DEFINE_INPUT_LED_TRIGGER(LED_COMPOSE, "compose"),
DEFINE_INPUT_LED_TRIGGER(LED_KANA, "kana"),
DEFINE_INPUT_LED_TRIGGER(LED_SLEEP, "sleep"),
DEFINE_INPUT_LED_TRIGGER(LED_SUSPEND, "suspend"),
DEFINE_INPUT_LED_TRIGGER(LED_MUTE, "mute"),
DEFINE_INPUT_LED_TRIGGER(LED_MISC, "misc"),
DEFINE_INPUT_LED_TRIGGER(LED_MAIL, "mail"),
DEFINE_INPUT_LED_TRIGGER(LED_CHARGING, "charging"),
};
/* Lock for registration coherency */
static DEFINE_MUTEX(vt_led_registered_lock);
/* Which VT LED classes and triggers are registered */
static unsigned long vt_led_registered[BITS_TO_LONGS(LED_CNT)];
/* Number of input devices having each LED */
static int vt_led_references[LED_CNT];
/* VT LED state change, tell the VT trigger. */
static void vt_led_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
int led = cdev - vt_leds;
led_trigger_event(&vt_led_triggers[led], !!brightness);
}
/* LED state change for some keyboard, notify that keyboard. */
static void perdevice_input_led_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct input_dev *dev;
struct led_classdev *leds;
int led;
dev = cdev->dev->platform_data;
if (!dev)
/* Still initializing */
return;
leds = dev->leds;
led = cdev - leds;
input_event(dev, EV_LED, led, !!brightness);
input_event(dev, EV_SYN, SYN_REPORT, 0);
}
/* Keyboard hotplug, initialize its LED status */
static void vt_led_trigger_activate(struct led_classdev *cdev)
{
struct led_trigger *trigger = cdev->trigger;
int led = trigger - vt_led_triggers;
if (cdev->brightness_set)
cdev->brightness_set(cdev, vt_leds[led].brightness);
}
/* Free led stuff from input device, used at abortion and disconnection. */
static void input_led_delete(struct input_dev *dev)
{
if (dev) {
struct led_classdev *leds = dev->leds;
if (leds) {
int i;
for (i = 0; i < LED_CNT; i++)
kfree(leds[i].name);
kfree(leds);
dev->leds = NULL;
}
}
}
/* A new input device with potential LEDs to connect. */
int input_led_connect(struct input_dev *dev)
{
int i, error = 0;
struct led_classdev *leds;
dev->leds = leds = kzalloc(sizeof(*leds) * LED_CNT, GFP_KERNEL);
if (!dev->leds)
return -ENOMEM;
/* lazily register missing VT LEDs */
mutex_lock(&vt_led_registered_lock);
for (i = 0; i < LED_CNT; i++)
if (vt_leds[i].name && test_bit(i, dev->ledbit)) {
if (!vt_led_references[i]) {
led_trigger_register(&vt_led_triggers[i]);
/* This keyboard is first to have led i,
* try to register it */
if (!led_classdev_register(NULL, &vt_leds[i]))
vt_led_references[i] = 1;
else
led_trigger_unregister(&vt_led_triggers[i]);
} else
vt_led_references[i]++;
}
mutex_unlock(&vt_led_registered_lock);
/* and register this device's LEDs */
for (i = 0; i < LED_CNT; i++)
if (vt_leds[i].name && test_bit(i, dev->ledbit)) {
leds[i].name = kasprintf(GFP_KERNEL, "%s::%s",
dev_name(&dev->dev),
vt_led_names[i]);
if (!leds[i].name) {
error = -ENOMEM;
goto err;
}
leds[i].max_brightness = 1;
leds[i].brightness_set = perdevice_input_led_set;
leds[i].default_trigger = vt_led_triggers[i].name;
}
/* No issue so far, we can register for real. */
for (i = 0; i < LED_CNT; i++)
if (leds[i].name) {
led_classdev_register(&dev->dev, &leds[i]);
leds[i].dev->platform_data = dev;
perdevice_input_led_set(&leds[i],
vt_leds[i].brightness);
}
return 0;
err:
input_led_delete(dev);
return error;
}
/*
* Disconnected input device. Clean it, and deregister now-useless VT LEDs and
* triggers.
*/
void input_led_disconnect(struct input_dev *dev)
{
int i;
struct led_classdev *leds = dev->leds;
for (i = 0; i < LED_CNT; i++)
if (leds[i].name)
led_classdev_unregister(&leds[i]);
input_led_delete(dev);
mutex_lock(&vt_led_registered_lock);
for (i = 0; i < LED_CNT; i++) {
if (!vt_leds[i].name || !test_bit(i, dev->ledbit))
continue;
vt_led_references[i]--;
if (vt_led_references[i]) {
/* Still some devices needing it */
continue;
}
led_classdev_unregister(&vt_leds[i]);
led_trigger_unregister(&vt_led_triggers[i]);
clear_bit(i, vt_led_registered);
}
mutex_unlock(&vt_led_registered_lock);
}
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("User LED support for input layer");
MODULE_AUTHOR("Samuel Thibault <samuel.thibault@ens-lyon.org>");
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