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leds: trigger: Introduce a MTD (NAND/NOR) trigger

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This commit introduces a MTD trigger for flash (NAND/NOR) device
activity. The implementation is copied from IDE disk.

This trigger deprecates the "nand-disk" LED trigger, but for backwards
compatibility, we still keep the "nand-disk" trigger around.

The motivation for deprecating the "nand-disk" LED trigger is that
it only works for NAND drivers, whereas the "mtd" LED trigger
is more generic (in fact, "nand-disk" currently only works for
certain NAND drivers).

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
This commit is contained in:
Ezequiel Garcia 2016-04-12 17:46:40 -03:00 committed by Jacek Anaszewski
parent 0c034fe377
commit 4b721174c7
4 changed files with 60 additions and 0 deletions
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8
drivers/leds/trigger/Kconfig
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@ -41,6 +41,14 @@ config LEDS_TRIGGER_IDE_DISK
This allows LEDs to be controlled by IDE disk activity.
If unsure, say Y.
config LEDS_TRIGGER_MTD
bool "LED MTD (NAND/NOR) Trigger"
depends on MTD
depends on LEDS_TRIGGERS
help
This allows LEDs to be controlled by MTD activity.
If unsure, say N.
config LEDS_TRIGGER_HEARTBEAT
tristate "LED Heartbeat Trigger"
depends on LEDS_TRIGGERS

1
drivers/leds/trigger/Makefile
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@ -1,6 +1,7 @@
obj-$(CONFIG_LEDS_TRIGGER_TIMER) += ledtrig-timer.o
obj-$(CONFIG_LEDS_TRIGGER_ONESHOT) += ledtrig-oneshot.o
obj-$(CONFIG_LEDS_TRIGGER_IDE_DISK) += ledtrig-ide-disk.o
obj-$(CONFIG_LEDS_TRIGGER_MTD) += ledtrig-mtd.o
obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT) += ledtrig-heartbeat.o
obj-$(CONFIG_LEDS_TRIGGER_BACKLIGHT) += ledtrig-backlight.o
obj-$(CONFIG_LEDS_TRIGGER_GPIO) += ledtrig-gpio.o

45
drivers/leds/trigger/ledtrig-mtd.c Normal file
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@ -0,0 +1,45 @@
/*
* LED MTD trigger
*
* Copyright 2016 Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
*
* Based on LED IDE-Disk Activity Trigger
*
* Copyright 2006 Openedhand Ltd.
*
* Author: Richard Purdie <rpurdie@openedhand.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/leds.h>
#define BLINK_DELAY 30
DEFINE_LED_TRIGGER(ledtrig_mtd);
DEFINE_LED_TRIGGER(ledtrig_nand);
void ledtrig_mtd_activity(void)
{
unsigned long blink_delay = BLINK_DELAY;
led_trigger_blink_oneshot(ledtrig_mtd,
&blink_delay, &blink_delay, 0);
led_trigger_blink_oneshot(ledtrig_nand,
&blink_delay, &blink_delay, 0);
}
EXPORT_SYMBOL(ledtrig_mtd_activity);
static int __init ledtrig_mtd_init(void)
{
led_trigger_register_simple("mtd", &ledtrig_mtd);
led_trigger_register_simple("nand-disk", &ledtrig_nand);
return 0;
}
device_initcall(ledtrig_mtd_init);

6
include/linux/leds.h
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@ -329,6 +329,12 @@ extern void ledtrig_ide_activity(void);
static inline void ledtrig_ide_activity(void) {}
#endif
#ifdef CONFIG_LEDS_TRIGGER_MTD
extern void ledtrig_mtd_activity(void);
#else
static inline void ledtrig_mtd_activity(void) {}
#endif
#if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
extern void ledtrig_flash_ctrl(bool on);
extern void ledtrig_torch_ctrl(bool on);