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openwrt中LED的控制Openwrt中LED的控制

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我是靠谱客的博主 长情大雁，最近开发中收集的这篇文章主要介绍openwrt中LED的控制Openwrt中LED的控制，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

Openwrt中LED的控制

由于公司没有使用openwrt的平台，而是使用LSDK的平台，所以好多东西都需要移植。只是内核版本升级到3.3.8，故需要把openwrt中应用层的接口移植到LSDK的平台上，所以简单研究了一下LED的控制流程。部分总结如下，后续继续补充：

主要涉及到的几个模块：

linux/kernels/linux-3.3.8/drivers/leds/ledtrig-gpio.ko
linux/kernels/linux-3.3.8/drivers/leds/ledtrig-timer.ko
linux/kernels/linux-3.3.8/drivers/leds/leds-gpio.ko
linux/kernels/linux-3.3.8/drivers/leds/ledtrig-default-on.ko
linux/kernels/linux-3.3.8/drivers/leds/ledtrig-netdev.ko

GPIO初始化文件：

linux/kernels/linux-3.3.8/arch/mips/ath79/mach-ap147.c

配置文件：

/etc/config/system
/etc/init.d/led
root@openwrt:# cat /etc/init.d/led 
#!/bin/sh /etc/rc.common
# Copyright (C) 2008 OpenWrt.org
START=96
load_led() {
local name
local sysfs
local trigger
local dev
local mode
local default
local delayon
local delayoff
local interval
config_get sysfs $1 sysfs
config_get name $1 name "$sysfs"
config_get trigger $1 trigger "none"
config_get dev $1 dev
config_get mode $1 mode "link"
config_get_bool default $1 default "nil"
config_get delayon $1 delayon
config_get delayoff $1 delayoff
config_get interval $1 interval "50"
config_get port_state $1 port_state
config_get delay $1 delay "150"
config_get message $1 message ""
if [ "$trigger" = "rssi" ]; then
# handled by rssileds userspace process
return
fi
[ -e /sys/class/leds/${sysfs}/brightness ] && {
echo "setting up led ${name}"
[ "$default" != nil ] && {
[ $default -eq 1 ] &&
echo 1 >/sys/class/leds/${sysfs}/brightness
[ $default -eq 1 ] ||
echo 0 >/sys/class/leds/${sysfs}/brightness
}
echo $trigger > /sys/class/leds/${sysfs}/trigger
case "$trigger" in
"netdev")
[ -n "$dev" ] && {
echo $dev > /sys/class/leds/${sysfs}/device_name
echo $mode > /sys/class/leds/${sysfs}/mode
}
;;
"timer")
[ -n "$delayon" ] && 
echo $delayon > /sys/class/leds/${sysfs}/delay_on
[ -n "$delayoff" ] && 
echo $delayoff > /sys/class/leds/${sysfs}/delay_off
;;
"usbdev")
[ -n "$dev" ] && {
echo $dev > /sys/class/leds/${sysfs}/device_name
echo $interval > /sys/class/leds/${sysfs}/activity_interval
}
;;
"port_state")
[ -n "$port_state" ] && 
echo $port_state > /sys/class/leds/${sysfs}/port_state
;;
"morse")
echo $message > /sys/class/leds/${sysfs}/message
echo $delay > /sys/class/leds/${sysfs}/delay
;;
switch[0-9]*)
local port_mask
config_get port_mask $1 port_mask
[ -n "$port_mask" ] && 
echo $port_mask > /sys/class/leds/${sysfs}/port_mask
;;
esac
}
}
start() {
[ -e /sys/class/leds/ ] && {
config_load system
config_foreach load_led led
}
}

root@openwrt:# cat /etc/config/system
# Heartbeat led
config 'led'
option 'sysfs'
'wrt160nl:amber:wps'
option 'trigger'
'heartbeat'
#WLAN led
config 'led' 'wlan_led'
option 'name'
'WLAN'
option 'sysfs'
'tl-wr1043nd:green:wlan'
option 'trigger'
'netdev'
option 'dev'
'wlan0'
option 'mode'
'link tx rx'
#3G led
#The 3G LED lits up in blue when an USB-dongle properly registers with the #3G/EDGE/GPRS network. Tested on Asus's WL-330N3G router.
config 'led'
option 'name'
'3G'
option 'sysfs'
'asus:blue:3g'
option 'trigger'
'netdev'
option 'dev'
'3g-wan'
option 'mode'
'link'
#Timer led - 500ms ON, 2000ms OFF
config 'led'
option 'sysfs'
'wrt160nl:blue:wps'
option 'trigger'
'timer'
option 'delayon'
'500'
option 'delayoff'
'2000'

1. GPIO口注册

修改对应的参考板mach文件即可，如linux/kernels/linux-3.3.8/arch/mips/ath79/mach-ap147.c。
1)、定义对应的GPIO口：

#define AP147_GPIO_LED_WLAN
12
#define AP147_GPIO_LED_WLAN_V2
4
#define AP147_GPIO_LED_SYS
0
#define AP147_GPIO_LED_SYS_V2
1
#define AP147_GPIO_LED_SIG1
1
#define AP147_GPIO_LED_SIG2
2
#define AP147_GPIO_LED_SIG3
3
#define AP147_GPIO_LED_NET
4
#define AP147_GPIO_LED_WAN
16
#define AP147_GPIO_LED_WAN_V2
2
#define AP147_GPIO_LED_LAN1
16
#define AP147_GPIO_LED_LAN1_V2
15
#define AP147_GPIO_LED_LAN2
15
#define AP147_GPIO_LED_LAN2_V2
16
#define AP147_GPIO_LED_LAN3
14
#define AP147_GPIO_LED_LAN3_V2
0
#define AP147_GPIO_LED_LAN4
11
#define AP147_GPIO_LED_LAN4_V2
3
#define AP147_GPIO_BTN_WPS
17
#define AP147_GPIO_BTN_WPS_V2
14
#define AP147_KEYS_POLL_INTERVAL
20
/* msecs */
#define AP147_KEYS_DEBOUNCE_INTERVAL
(3 * AP147_KEYS_POLL_INTERVAL)
#define AP147_MAC0_OFFSET
0
#define AP147_MAC1_OFFSET
6
#define AP147_WMAC_CALDATA_OFFSET
0x1000
#define AP147_MAX_LED_WPS_GPIOS
6
#define AP147_MAX_BOARD_VERSION
2
#define AP147_V2_ID
17
#define AP147_WMAC1_CALDATA_OFFSET
0x5000
#define BOARDID_OFFSET
0x20
#define BOARD_V1
0
#define BOARD_V2
1

2)、注册：

static struct gpio_led ap147_leds_gpio[] __initdata = {
{
.name
= "ap147:green:status",
.gpio
= AP147_GPIO_LED_SYS,
.active_low = 1,
},
{
.name
= "ap147:green:sig1",
.gpio
= AP147_GPIO_LED_SIG1,
.active_low = 1,
},
{
.name
= "ap147:green:sig2",
.gpio
= AP147_GPIO_LED_SIG2,
.active_low = 1,
},
{
.name
= "ap147:green:sig3",
.gpio
= AP147_GPIO_LED_SIG3,
.active_low = 1,
},
{
.name
= "ap147:green:net",
.gpio
= AP147_GPIO_LED_NET,
.active_low = 1,
},
{
.name
= "ap147:green:wlan",
.gpio
= AP147_GPIO_LED_WLAN,
.active_low = 1,
}
};
static struct gpio_keys_button ap147_gpio_keys[] __initdata = {
{
.desc
= "WPS button",
.type
= EV_KEY,
.code
= BTN_0,
.debounce_interval = AP147_KEYS_DEBOUNCE_INTERVAL,
.gpio
= AP147_GPIO_BTN_WPS,
.active_low = 1,
},
};
static void __init ap147_gpio_led_setup(int board_version)
{
ath79_gpio_direction_select(ap147_gpios[board_version][WAN], true);
ath79_gpio_direction_select(ap147_gpios[board_version][LAN1], true);
ath79_gpio_direction_select(ap147_gpios[board_version][LAN2], true);
ath79_gpio_direction_select(ap147_gpios[board_version][LAN3], true);
ath79_gpio_direction_select(ap147_gpios[board_version][LAN4], true);
ath79_gpio_output_select(ap147_gpios[board_version][WAN],
QCA953X_GPIO_OUT_MUX_LED_LINK5);
ath79_gpio_output_select(ap147_gpios[board_version][LAN1],
QCA953X_GPIO_OUT_MUX_LED_LINK1);
ath79_gpio_output_select(ap147_gpios[board_version][LAN2],
QCA953X_GPIO_OUT_MUX_LED_LINK2);
ath79_gpio_output_select(ap147_gpios[board_version][LAN3],
QCA953X_GPIO_OUT_MUX_LED_LINK3);
ath79_gpio_output_select(ap147_gpios[board_version][LAN4],
QCA953X_GPIO_OUT_MUX_LED_LINK4);
if (board_version == BOARD_V2) {
ap147_leds_gpio[0].active_low = 0;
ap147_leds_gpio[0].gpio = AP147_GPIO_LED_SYS_V2;
ap147_leds_gpio[1].gpio = AP147_GPIO_LED_WLAN_V2;
ap147_gpio_keys[0].gpio = AP147_GPIO_BTN_WPS_V2;
}
ath79_register_leds_gpio(-1, ARRAY_SIZE(ap147_leds_gpio),
ap147_leds_gpio);
ath79_register_gpio_keys_polled(-1, AP147_KEYS_POLL_INTERVAL,
ARRAY_SIZE(ap147_gpio_keys),
ap147_gpio_keys);
}
static void __init ap147_setup(void)
{
u8 *art = (u8 *) KSEG1ADDR(0x1fff0000);
u8 board_id = *(u8 *) (art + AP147_WMAC1_CALDATA_OFFSET + BOARDID_OFFSET);
pr_info("AP147 Reference Board Id is %dn",(u8)board_id);
ath79_register_m25p80(NULL);
if (board_id == AP147_V2_ID) {
/* Disabling the JTAG due to conflicting GPIO's.
* Can be re-enabled dynamically by writing appropriate
* value to GPIO_FUNCTION_ADDRESS register
*/
ath79_gpio_function_enable(AR934X_GPIO_FUNC_JTAG_DISABLE);
ap147_gpio_led_setup(BOARD_V2);
} else {
ath79_gpio_function_enable(AR934X_GPIO_FUNC_JTAG_DISABLE);
ap147_gpio_led_setup(BOARD_V1);
}
ath79_register_usb();
ath79_register_pci();
ath79_register_wmac(art + AP147_WMAC_CALDATA_OFFSET, NULL);
ath79_register_mdio(0, 0x0);
ath79_register_mdio(1, 0x0);
ath79_init_mac(ath79_eth0_data.mac_addr, art + AP147_MAC0_OFFSET, 0);
ath79_init_mac(ath79_eth1_data.mac_addr, art + AP147_MAC1_OFFSET, 0);
/* WAN port */
ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_MII;
ath79_eth0_data.speed = SPEED_100;
ath79_eth0_data.duplex = DUPLEX_FULL;
ath79_eth0_data.phy_mask = BIT(4);
ath79_register_eth(0);
/* LAN ports */
ath79_eth1_data.phy_if_mode = PHY_INTERFACE_MODE_GMII;
ath79_eth1_data.speed = SPEED_1000;
ath79_eth1_data.duplex = DUPLEX_FULL;
ath79_switch_data.phy_poll_mask |= BIT(4);
ath79_switch_data.phy4_mii_en = 1;
ath79_register_eth(1);
}
MIPS_MACHINE(ATH79_MACH_AP147, "AP147", "Qualcomm Atheros AP147 reference board",
ap147_setup);

2. 自定义控制LED打开/关闭

# 自定义4G信号灯的信号强度
# sysfs=ap147:green:sig1
root@OpenWrt:/# echo 1 >/sys/class/leds/${sysfs}/brightness # 打开
root@OpenWrt:/# echo 0 >/sys/class/leds/${sysfs}/brightness # 关闭

3. 自动事件触发LED打开/关闭

# wifi 2.4G的灯由系统自己控制
# sysfs=ap147:green:wlan
root@OpenWrt:/# echo 255 > /sys/class/leds/${sysfs}/brightness
root@OpenWrt:/# echo netdev > /sys/class/leds/${sysfs}/trigger
root@OpenWrt:/# echo ath0 > /sys/class/leds/${sysfs}/device_name
root@OpenWrt:/# echo 'tx rx' > /sys/class/leds/${sysfs}/mode

4. 自定义事件触发LED打开/关闭/闪烁

# 系统灯周期闪烁
# sysfs=ap147:green:status
root@OpenWrt:/# echo 255 > /sys/class/leds/${sysfs}/brightness
root@OpenWrt:/# echo timer > /sys/class/leds/${sysfs}/trigger
root@OpenWrt:/# echo 1000 > /sys/class/leds/${sysfs}/delay_on
root@OpenWrt:/# echo 1000 > /sys/class/leds/${sysfs}/delay_off

5. 网口灯自动闪烁


网口灯也可以实现手动配置和自动闪烁，不过这个配置已经在驱动完成了，详看mach-ap147.c文件。如果想移植为通用的，即可删除mach文件中的配置，只进行注册即可，配置由应用层完成。 

ath79_gpio_direction_select(ap147_gpios[board_version][WAN], true);
ath79_gpio_direction_select(ap147_gpios[board_version][LAN1], true);
ath79_gpio_direction_select(ap147_gpios[board_version][LAN2], true);
ath79_gpio_direction_select(ap147_gpios[board_version][LAN3], true);
ath79_gpio_direction_select(ap147_gpios[board_version][LAN4], true);
ath79_gpio_output_select(ap147_gpios[board_version][WAN],
QCA953X_GPIO_OUT_MUX_LED_LINK5);
ath79_gpio_output_select(ap147_gpios[board_version][LAN1],
QCA953X_GPIO_OUT_MUX_LED_LINK1);
ath79_gpio_output_select(ap147_gpios[board_version][LAN2],
QCA953X_GPIO_OUT_MUX_LED_LINK2);
ath79_gpio_output_select(ap147_gpios[board_version][LAN3],
QCA953X_GPIO_OUT_MUX_LED_LINK3);
ath79_gpio_output_select(ap147_gpios[board_version][LAN4],
QCA953X_GPIO_OUT_MUX_LED_LINK4);

最后

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