SMART210---LED driver

After a few days of learning, finally the basic framework of Linux drive to figure out ... Really hard,,, but finally still boil over, although still the most basic,,,

Tonight also finished my first Linux drive,,, Heart still a little excited, haha o (∩_∩) o

Directly on the drive source program:::

My Development Board is Smart210, according to schematic, IO port output 0 LED light, Output 1 led off

#include <linux/kernel.h>#include<linux/module.h>#include<linux/miscdevice.h>#include<linux/fs.h>#include<linux/types.h>#include<linux/moduleparam.h>#include<linux/slab.h>#include<linux/ioctl.h>#include<linux/cdev.h>#include<linux/delay.h>#include<mach/gpio.h>#include<mach/regs-gpio.h>#include<plat/gpio-cfg.h>#defineDevice_name "LEDs"/*the 2nd parameter when the application executes the IOCTL (FD, CMD, arg)*/  /*The second parameter that application program execute*/  #defineIOCTL_GPIO_ON 1#defineIoctl_gpio_off 0/*used to specify the GPIO pin used by the LEDs*/  /*appoint the pin the LED would use*/  StaticUnsignedLongleds_table [] ={s5pv210_gpj2 (0), S5pv210_gpj2 (1), S5pv210_gpj2 (2), S5pv210_gpj2 (3),          //arch\arm\mach-s5pv210\include\mach\gpio.h  }; Static Charleds_name[][4]={{"LED1"},{"LED2"},{"LED2"},{"LED3"}}; #defineLed_num array_size (leds_table)/** Function function: Turn on/dev/led devices *fuction:open/dev/leds device * Device name is:/dev/leds *devce name:/dev/leds **/  Static intMy_led_open (structInode *inode,structFile *file) {       inti; interr;  for(i =0; i < Led_num; i++) {Err=gpio_request (Leds_table[i], leds_name[i]); //DRIVERS/GPIO/GPIOLIB.C           if(Err) {PRINTK (Kern_err"failed to request S5PV210_GPH2 (%d) for led%d \ n", I-1, i); returnerr; }       }           for(i =0; i < Led_num; i++) {S3c_gpio_cfgpin (leds_table[i], s3c_gpio_output);//Configuration pin function:input output multiplexGpio_set_value (Leds_table[i],1);//Set the pin level//arch\arm\plat-samsung\gpio-config.c//Gpio_direction_output (Leds_table[i], 0);//write a value to GPIO port, also set the port to output mode//Gpio_set_value (Leds_table[i], 0); //DRIVERS/GPIO/GPIOLIB.C} printk (Kern_info"LEDs driver successfully close\n"); return 0; } Static LongMy_led_ioctl (structFile *filep, unsignedintCMD, unsignedLongArg) {arg-=1; if(Arg >led_num) {        return-EINVAL; }    Switch(cmd) { CaseIOCTL_GPIO_ON:PRINTK ("led light\n"); Gpio_set_value (Leds_table[arg],0);  Break;  CaseIOCTL_GPIO_OFF:PRINTK ("led no light\n"); Gpio_set_value (Leds_table[arg],1);  Break; default: PRINTK ("led failed\n"); return-EINVAL; }    return 0; } Static intMy_led_close (structInode * Inode,structFile *file) {     inti;  for(i=0; i < Led_num; i++) Gpio_free (Leds_table[i]); PRINTK (Kern_emerg"Close success\n"); return 0; }structFile_operations My_led_ops ={. Owner=this_module,. Open=My_led_open,. Unlocked_ioctl=my_led_ioctl,. Release=My_led_close,};Static structMiscdevice Led_misc ={. Minor=Misc_dynamic_minor,. Name=device_name,. FoPs= &My_led_ops,};Static int__init My_led_init (void){    intret; RET= Misc_register (&Led_misc); if(ret) {PRINTK (Kern_info"Misc_register failed\n"); } PRINTK (Kern_info"Misc_register sucessed\n"); return 0;}Static void__exit My_led_exit (void) {    inti; Misc_deregister (&Led_misc);  for(i=0; i < Led_num; i++) Gpio_free (Leds_table[i]); PRINTK (Kern_info"LEDs driver successfully exit\n");} Module_init (My_led_init); Module_exit (My_led_exit); Module_license ("GPL"); Module_author ("Qigaohua"); 

Application:

#include <stdio.h>#include<stdlib.h>#include<fcntl.h>#include<sys/time.h>#defineIOCTL_GPIO_ON 1#defineIoctl_gpio_off 0intMainintargcChar**argv) {    intFD; FD= Open ("/dev/leds",0); if(FD <0) {printf ("/dev/leds Open failed\n"); Exit (1); }         Do{printf ("/dev/leds Open sucessed\n"); IOCTL (FD, ioctl_gpio_on,1); IOCTL (FD, Ioctl_gpio_off,2); IOCTL (FD, Ioctl_gpio_off,3); IOCTL (FD, Ioctl_gpio_off,4); Sleep (1); IOCTL (FD, ioctl_gpio_on,1); IOCTL (FD, ioctl_gpio_on,2); IOCTL (FD, Ioctl_gpio_off,3); IOCTL (FD, Ioctl_gpio_off,4); Sleep (1); IOCTL (FD, ioctl_gpio_on,1); IOCTL (FD, ioctl_gpio_on,2); IOCTL (FD, ioctl_gpio_on,3); IOCTL (FD, Ioctl_gpio_off,4); Sleep (1); IOCTL (FD, ioctl_gpio_on,1); IOCTL (FD, ioctl_gpio_on,2); IOCTL (FD, ioctl_gpio_on,3); IOCTL (FD, ioctl_gpio_on,4); Sleep (1); IOCTL (FD, Ioctl_gpio_off,1); IOCTL (FD, Ioctl_gpio_off,2); IOCTL (FD, Ioctl_gpio_off,3); IOCTL (FD, Ioctl_gpio_off,4); } while(0);    Close (FD); return 0;}

SMART210---LED driver