FL2440开发板platform_led驱动及应用程序
FL2440开发板platform_led驱动及应用程序
驱动程序：
[luxibao@centos ~]$ mkdir platform_LED
[luxibao@centos ~]$ ls
dropbear-0.53.1 fl2440 hello.1 platform_LED 模板 图片 下载 桌面
dropbear-0.53.1.tar.bz2 hello LED 公共的 视频 文档 音乐
[luxibao@centos ~]$ cd platform_LED
这里用了郭工的代码：
[luxibao@centos platform_LED]$ vim plat_led.c
/*********************************************************************************
* Copyright: (C) 2011 Guo Wenxue
* All rights reserved.
*
* Filename: s3c_led.c
* Description: This is the common LED driver runs on S3C24XX.
*
* Version: 1.0.0(10/27/2011~)
* Author: Guo Wenxue
* ChangeLog: 1, Release initial version on "10/27/2011 11:39:10 AM"
*
********************************************************************************/
#include "s3c_driver.h"
#define DRV_AUTHOR "Guo Wenxue
#define DRV_DESC "S3C24XX LED driver"
/* Driver version*/
#define DRV_MAJOR_VER 1
#define DRV_MINOR_VER 0
#define DRV_REVER_VER 0
#define DEV_NAME DEV_LED_NAME
//#define DEV_MAJOR DEV_LED_MAJOR
#ifndef DEV_MAJOR
#define DEV_MAJOR 0 /* dynamic major by default */
#endif
#define TIMER_TIMEOUT 40
static int debug = DISABLE;
static int dev_major = DEV_MAJOR;
static int dev_minor = 0;
/* ============================ Platform Device part ===============================*/
/* LED hardware informtation structure*/
struct s3c_led_info
{
unsigned char num; /* The LED number */
unsigned int gpio; /* Which GPIO the LED used */
unsigned char active_level; /* The GPIO pin level(HIGHLEVEL or LOWLEVEL) to turn on or off */
unsigned char status; /* Current LED status: OFF/ON */
unsigned char blink; /* Blink or not */
};
/* The LED platform device private data structure */
struct s3c_led_platform_data
{
struct s3c_led_info *leds;
int nleds;
};
/* LED hardware informtation data*/
static struct s3c_led_info s3c_leds[] = {
[0] = {
.num = 1,
.gpio = S3C2410_GPB(5),
.active_level = LOWLEVEL,
.status = OFF,
.blink = ENABLE,
},
[1] = {
.num = 2,
.gpio = S3C2410_GPB(6),
.active_level = LOWLEVEL,
.status = OFF,
.blink = DISABLE,
},
[2] = {
.num = 3,
.gpio = S3C2410_GPB(8),
.active_level = LOWLEVEL,
.status = OFF,
.blink = DISABLE,
},
[3] = {
.num = 4,
.gpio = S3C2410_GPB(10),
.active_level = LOWLEVEL,
.status = OFF,
.blink = DISABLE,
},
};
/* The LED platform device private data */
static struct s3c_led_platform_data s3c_led_data = {
.leds = s3c_leds,
.nleds = ARRAY_SIZE(s3c_leds),
};
struct led_device
{
struct s3c_led_platform_data *data;
struct cdev cdev;
struct class *dev_class;
struct timer_list blink_timer;
} led_device;
static void platform_led_release(struct device * dev)
{
int i;
struct s3c_led_platform_data *pdata = dev->platform_data;
dbg_print("%s():%d\n", __FUNCTION__,__LINE__);
/* Turn all LED off */
for(i=0; i
{
s3c2410_gpio_setpin(pdata->leds[i].gpio, ~pdata->leds[i].active_level);
}
}
static struct platform_device s3c_led_device = {
.name = "s3c_led",
.id = 1,
.dev =
{
.platform_data = &s3c_led_data,
.release = platform_led_release,
},
};
/* ===================== led device driver part ===========================*/
void led_timer_handler(unsigned long data)
{
int i;
struct s3c_led_platform_data *pdata = (struct s3c_led_platform_data *)data;
for(i=0; i
{
if(ON == pdata->leds[i].status)
{
s3c2410_gpio_setpin(pdata->leds[i].gpio, pdata->leds[i].active_level);
}
else
{
s3c2410_gpio_setpin(pdata->leds[i].gpio, ~pdata->leds[i].active_level);
}
if(ENABLE == pdata->leds[i].blink ) /* LED should blink */
{
/* Switch status between 0 and 1 to turn LED ON or off */
pdata->leds[i].status = pdata->leds[i].status ^ 0x01;
}
mod_timer(&(led_device.blink_timer), jiffies + TIMER_TIMEOUT);
}
}
static int led_open(struct inode *inode, struct file *file)
{
struct led_device *pdev ;
struct s3c_led_platform_data *pdata;
pdev = container_of(inode->i_cdev,struct led_device, cdev);
pdata = pdev->data;
file->private_data = pdata;
return 0;
}
static int led_release(struct inode *inode, struct file *file)
{
return 0;
}
static void print_led_help(void)
{
printk("Follow is the ioctl() command for LED driver:\n");
printk("Enable Driver debug command: %u\n", SET_DRV_DEBUG);
printk("Get Driver verion command : %u\n", GET_DRV_VER);
printk("Turn LED on command : %u\n", LED_ON);
printk("Turn LED off command : %u\n", LED_OFF);
printk("Turn LED blink command : %u\n", LED_BLINK);
}
/* compatible with kernel version >=2.6.38*/
static long led_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct s3c_led_platform_data *pdata = file->private_data;
switch (cmd)
{
case SET_DRV_DEBUG:
dbg_print("%s driver debug now.\n", DISABLE == arg ? "Disable" : "Enable");
debug = (0==arg) ? DISABLE : ENABLE;
break;
case GET_DRV_VER:
print_version(DRV_VERSION);
return DRV_VERSION;
case LED_OFF:
if(pdata->nleds <= arg)
{
printk("LED%ld doesn't exist\n", arg);
return -ENOTTY;
}
pdata->leds[arg].status = OFF;
pdata->leds[arg].blink = DISABLE;
break;
case LED_ON:
if(pdata->nleds <= arg)
{
printk("LED%ld doesn't exist\n", arg);
return -ENOTTY;
}
pdata->leds[arg].status = ON;
pdata->leds[arg].blink = DISABLE;
break;
case LED_BLINK:
if(pdata->nleds <= arg)
{
printk("LED%ld doesn't exist\n", arg);
return -ENOTTY;
}
pdata->leds[arg].blink = ENABLE;
pdata->leds[arg].status = ON;
break;
default:
dbg_print("%s driver don't support ioctl command=%d\n", DEV_NAME, cmd);
print_led_help();
return -EINVAL;
}
return 0;
}
static struct file_operations led_fops = {
.owner = THIS_MODULE,
.open = led_open,
.release = led_release,
.unlocked_ioctl = led_ioctl, /* compatible with kernel version >=2.6.38*/
};
static int s3c_led_probe(struct platform_device *dev)
{
struct s3c_led_platform_data *pdata = dev->dev.platform_data;
int result = 0;
int i;
dev_t devno;
/* Initialize the LED status */
for(i=0; i
{
s3c2410_gpio_cfgpin(pdata->leds[i].gpio, S3C2410_GPIO_OUTPUT);
if(ON == pdata->leds[i].status)
{
s3c2410_gpio_setpin(pdata->leds[i].gpio, pdata->leds[i].active_level);
}
else
{
s3c2410_gpio_setpin(pdata->leds[i].gpio, ~pdata->leds[i].active_level);
}
}
/* Alloc the device for driver */
if (0 != dev_major)
{
devno = MKDEV(dev_major, dev_minor);
result = register_chrdev_region(devno, 1, DEV_NAME);
}
else
{
result = alloc_chrdev_region(&devno, dev_minor, 1, DEV_NAME);
dev_major = MAJOR(devno);
}
/* Alloc for device major failure */
if (result < 0)
{
printk("%s driver can't get major %d\n", DEV_NAME, dev_major);
return result;
}
/* Initialize button structure and register cdev*/
memset(&led_device, 0, sizeof(led_device));
led_device.data = dev->dev.platform_data;
cdev_init (&(led_device.cdev), &led_fops);
led_device.cdev.owner = THIS_MODULE;
result = cdev_add (&(led_device.cdev), devno , 1);
if (result)
{
printk (KERN_NOTICE "error %d add %s device", result, DEV_NAME);
goto ERROR;
}
led_device.dev_class = class_create(THIS_MODULE, DEV_NAME);
if(IS_ERR(led_device.dev_class))
{
printk("%s driver create class failture\n",DEV_NAME);
result = -ENOMEM;
goto ERROR;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
device_create(led_device.dev_class, NULL, devno, NULL, DEV_NAME);
#else
device_create (led_device.dev_class, NULL, devno, DEV_NAME);
#endif
/* Initial the LED blink timer */
init_timer(&(led_device.blink_timer));
led_device.blink_timer.function = led_timer_handler;
led_device.blink_timer.data = (unsigned long)pdata;
led_device.blink_timer.expires = jiffies + TIMER_TIMEOUT;
add_timer(&(led_device.blink_timer));
printk("S3C %s driver version %d.%d.%d initiliazed.\n", DEV_NAME, DRV_MAJOR_VER, DRV_MINOR_VER, DRV_REVER_VER);
return 0;
ERROR:
printk("S3C %s driver version %d.%d.%d install failure.\n", DEV_NAME, DRV_MAJOR_VER, DRV_MINOR_VER, DRV_REVER_VER);
cdev_del(&(led_device.cdev));
unregister_chrdev_region(devno, 1);
return result;
}
static int s3c_led_remove(struct platform_device *dev)
{
dev_t devno = MKDEV(dev_major, dev_minor);
del_timer(&(led_device.blink_timer));
cdev_del(&(led_device.cdev));
device_destroy(led_device.dev_class, devno);
class_destroy(led_device.dev_class);
unregister_chrdev_region(devno, 1);
printk("S3C %s driver removed\n", DEV_NAME);
return 0;
}
static struct platform_driver s3c_led_driver = {
.probe = s3c_led_probe,
.remove = s3c_led_remove,
.driver = {
.name = "s3c_led",
.owner = THIS_MODULE,
},
};
static int __init s3c_led_init(void)
{
int ret = 0;
ret = platform_device_register(&s3c_led_device);
if(ret)
{
printk(KERN_ERR "%s:%d: Can't register platform device %d\n", __FUNCTION__,__LINE__, ret);
goto fail_reg_plat_dev;
}
dbg_print("Regist S3C LED Platform Device successfully.\n");
ret = platform_driver_register(&s3c_led_driver);
if(ret)
{
printk(KERN_ERR "%s:%d: Can't register platform driver %d\n", __FUNCTION__,__LINE__, ret);
goto fail_reg_plat_drv;
}
dbg_print("Regist S3C LED Platform Driver successfully.\n");
return 0;
fail_reg_plat_drv:
platform_driver_unregister(&s3c_led_driver);
fail_reg_plat_dev:
return ret;
}
static void s3c_led_exit(void)
{
dbg_print("%s():%d remove LED platform drvier\n", __FUNCTION__,__LINE__);
platform_driver_unregister(&s3c_led_driver);
dbg_print("%s():%d remove LED platform device\n", __FUNCTION__,__LINE__);
platform_device_unregister(&s3c_led_device);
}
module_init(s3c_led_init);
module_exit(s3c_led_exit);
module_param(debug, int, S_IRUGO);
module_param(dev_major, int, S_IRUGO);
module_param(dev_minor, int, S_IRUGO);
MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION(DRV_DESC);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:S3C24XX_led");
[luxibao@centos platform_LED]$ vim Makefile
obj-m:=plat_led.c
C=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-gcc
KDIR?=/home/luxibao/fl2440/kernel/linux-3.0
obj-m:=plat_led.o
default:
$(MAKE) -C $(KDIR) M=`pwd` modules
make clean
clean:
rm -f *.o *mod.c *.order *.symvers
[luxibao@centos platform_LED]$ ls
Makefile plat_ioctl.h plat_led.c s3c_driver.h
[luxibao@centos platform_LED]$ make
make -C /home/luxibao/fl2440/kernel/linux-3.0 M=`pwd` modules
make[1]: Entering directory `/home/luxibao/fl2440/kernel/linux-3.0'
CC [M] /home/luxibao/platform_LED/plat_led.o
Building modules, stage 2.
MODPOST 1 modules
CC /home/luxibao/platform_LED/plat_led.mod.o
LD [M] /home/luxibao/platform_LED/plat_led.ko
make[1]: Leaving directory `/home/luxibao/fl2440/kernel/linux-3.0'
make clean
make[1]: Entering directory `/home/luxibao/platform_LED'
rm -f *.o *mod.c *.order *.symvers
make[1]: Leaving directory `/home/luxibao/platform_LED'
[luxibao@centos platform_LED]$ ls
Makefile plat_ioctl.h plat_led.c plat_led.ko s3c_driver.h
应用程序：
[luxibao@centos platform_LED]$ mkdir platform_led_test
[luxibao@centos platform_LED]$ ls
Makefile platform_led_test plat_ioctl.h plat_led.c
[luxibao@centos platform_LED]$ cd platform_led_test/
[luxibao@centos platform_led_test]$ vim plat_ioctl.c
*********************************************************************************
* Copyright: (C) 2016 luxibao <[email protected]>
* All rights reserved.
*
* Filename: plat_icotl.c
* Description: This file
*
* Version: 1.0.0(08/01/2016)
* Author: luxibao <[email protected]>
* ChangeLog: 1, Release initial version on "08/01/2016 17:35:23 "
*
********************************************************************************/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define PLATDRV_MAGIC 0x60
#define LED_OFF _IO (PLATDRV_MAGIC, 0x18)
#define LED_ON _IO (PLATDRV_MAGIC, 0x19)
#define LED_BLINK _IO (PLATDRV_MAGIC, 0x1A)
#define DEVNAMELEN 10
int main (int argc,char **argv)
{
int fd;
fd=open("dev/led",O_RDWR);
ioctl(fd,LED_ON,0);
ioctl(fd,LED_ON,1);
ioctl(fd,LED_BLINK,2);
ioctl(fd,LED_BLINK,3);
close(fd);
return 0;
}
[luxibao@centos platform_led_test]$ /opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-gcc plat_ioctl.c
[luxibao@centos platform_led_test]$ ls
a.out plat_ioctl.c
在开发板上的操作：
>: tftp -gr plat_led.ko 192.168.1.2
plat_led.ko 100% |*******************************| 8827 0:00:00 ETA
>: tftp -gr a.out 192.168.1.2
a.out 100% |*******************************| 5137 0:00:00 ETA
>: chmod 777 a.out
>: chmod 777 plat_led.ko
>: insmod plat_led.ko
S3C led driver version 1.0.0 initiliazed.
>: mknod /dev/led0 c 251 0
>: mknod /dev/led1 c 251 1
>: mknod /dev/led2 c 251 2
>: mknod /dev/led3 c 251 3
>: ls -l dev/led*
crw-rw---- 1 root root 251, 0 Dec 31 17:02 dev/led
crw-r--r-- 1 root root 251, 0 Dec 31 17:02 dev/led0
crw-r--r-- 1 root root 251, 1 Dec 31 17:02 dev/led1
crw-r--r-- 1 root root 251, 2 Dec 31 17:02 dev/led2
crw-r--r-- 1 root root 251, 3 Dec 31 17:02 dev/led3
>: ll a.out
-rwxrwxrwx 1 root root 5137 Dec 31 17:00 a.out
>: chmod 777 a.out
>:./a.out
此时你就会看到led0,led1,led2是稳定红灯，led3是一闪一闪的红灯.
遇到的问题：
1.make时缺少文件：
解决：加载文件：
