按鍵平台驅動：
platfrom_device.c:
#include <linux/device.h>
#include <linux/string.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/irq.h>
#include <asm/irq.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <linux/cdev.h>
#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/gpio.h>
static struct resource key_resource[]=
{
[0] = {
.start = IRQ_EINT8,
.end = IRQ_EINT8,
.flags = IORESOURCE_IRQ,
},
[1] = {
.start = IRQ_EINT11,
.end = IRQ_EINT11,
.flags = IORESOURCE_IRQ,
},
[2]= {
.start = IRQ_EINT13,
.end = IRQ_EINT13,
.flags = IORESOURCE_IRQ,
},
[3] = {
.start = IRQ_EINT14,
.end = IRQ_EINT14,
.flags = IORESOURCE_IRQ,
},
[4] = {
.start = IRQ_EINT15,
.end = IRQ_EINT15,
.flags = IORESOURCE_IRQ,
},
[5] = {
.start = IRQ_EINT19,
.end = IRQ_EINT19,
.flags = IORESOURCE_IRQ,
},
};
struct platform_device *my_buttons_dev;
static int __init platform_dev_init(void)
{
int ret;
my_buttons_dev = platform_device_alloc("my_buttons", -1);
platform_device_add_resources(my_buttons_dev,key_resource,6);//添加資源一定要用該函數，不能使用對platform_device->resource幅值
//否則會導緻platform_device_unregister調用失敗，核心異常。
ret = platform_device_add(my_buttons_dev);
if(ret)
platform_device_put(my_buttons_dev);
return ret;
}
static void __exit platform_dev_exit(void)
{
platform_device_unregister(my_buttons_dev);
}
module_init(platform_dev_init);
module_exit(platform_dev_exit);
MODULE_AUTHOR("Z-YP");
MODULE_LICENSE("GPL");
platfrom_derver.c:
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/irq.h>
#include <asm/irq.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <linux/platform_device.h>
#include <linux/cdev.h>
#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/gpio.h>
#define DEVICE_NAME "my_buttons"
struct button_irq_desc {
int irq;
int pin;
int pin_setting;
int number;
char *name;
};
static struct button_irq_desc button_irqs [] = {
{IRQ_EINT8 , S3C2410_GPG(0) , S3C2410_GPG0_EINT8 , 0, "KEY0"},
{IRQ_EINT11, S3C2410_GPG(3) , S3C2410_GPG3_EINT11 , 1, "KEY1"},
{IRQ_EINT13, S3C2410_GPG(5) , S3C2410_GPG5_EINT13 , 2, "KEY2"},
{IRQ_EINT14, S3C2410_GPG(6) , S3C2410_GPG6_EINT14 , 3, "KEY3"},
{IRQ_EINT15, S3C2410_GPG(7) , S3C2410_GPG7_EINT15 , 4, "KEY4"},
{IRQ_EINT19, S3C2410_GPG(11), S3C2410_GPG11_EINT19, 5, "KEY5"},
};
static volatile char key_values [] = {'0', '0', '0', '0', '0', '0'};
static DECLARE_WAIT_QUEUE_HEAD(button_waitq);
static volatile int ev_press = 0;
static irqreturn_t buttons_interrupt(int irq, void *dev_id)
{
struct button_irq_desc *button_irqs = (struct button_irq_desc *)dev_id;
int down;
// udelay(0);
down = !s3c2410_gpio_getpin(button_irqs->pin);
if (down != (key_values[button_irqs->number] & 1)) { // Changed
key_values[button_irqs->number] = '0' + down;
ev_press = 1;
wake_up_interruptible(&button_waitq);
}
return IRQ_RETVAL(IRQ_HANDLED);
}
static int s3c24xx_buttons_open(struct inode *inode, struct file *file)
{
int i;
int err = 0;
for (i = 0; i < sizeof(button_irqs)/sizeof(button_irqs[0]); i++) {
if (button_irqs[i].irq < 0) {
continue;
}
err = request_irq(button_irqs[i].irq, buttons_interrupt, IRQ_TYPE_EDGE_BOTH,
button_irqs[i].name, (void *)&button_irqs[i]);
if (err)
break;
}
if (err) {
i--;
for (; i >= 0; i--) {
if (button_irqs[i].irq < 0) {
continue;
}
disable_irq(button_irqs[i].irq);
free_irq(button_irqs[i].irq, (void *)&button_irqs[i]);
}
return -EBUSY;
}
ev_press = 1;
return 0;
}
static int s3c24xx_buttons_close(struct inode *inode, struct file *file)
{
int i;
for (i = 0; i < sizeof(button_irqs)/sizeof(button_irqs[0]); i++) {
if (button_irqs[i].irq < 0) {
continue;
}
free_irq(button_irqs[i].irq, (void *)&button_irqs[i]);
}
return 0;
}
static int s3c24xx_buttons_read(struct file *filp, char __user *buff, size_t count, loff_t *offp)
{
unsigned long err;
if (!ev_press) {
if (filp->f_flags & O_NONBLOCK)
return -EAGAIN;
else
wait_event_interruptible(button_waitq, ev_press);
}
ev_press = 0;
err = copy_to_user(buff, (const void *)key_values, min(sizeof(key_values), count));
return err ? -EFAULT : min(sizeof(key_values), count);
}
static unsigned int s3c24xx_buttons_poll( struct file *file, struct poll_table_struct *wait)
{
unsigned int mask = 0;
poll_wait(file, &button_waitq, wait);
if (ev_press)
mask |= POLLIN | POLLRDNORM;
return mask;
}
static struct file_operations dev_fops = {
.owner = THIS_MODULE,
.open = s3c24xx_buttons_open,
.release = s3c24xx_buttons_close,
.read = s3c24xx_buttons_read,
.poll = s3c24xx_buttons_poll,
};
static struct miscdevice misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "my_buttons",
.fops = &dev_fops,
};
#if 1
static int my_plat_probe(struct platform_device *dev)
{
int ret,i;
struct resource *plat_resource;
struct platform_device *pdev = dev;
//printk("----");
for(i = 0;i < 6;i++)
{
plat_resource = platform_get_resource(pdev,IORESOURCE_IRQ,i);
if(plat_resource == NULL)
{
return -ENOENT;
}
button_irqs[i].irq = plat_resource->start;
}
ret = misc_register(&misc);
if(ret)
{
return ret;
}
return 0;
}
#endif
static int my_plat_remove(struct platform_device *dev)
{
printk("my platfrom device has removed.");
misc_deregister(&misc);
return 0;
}
struct platform_driver my_buttons_drv = {
.probe = my_plat_probe,
.remove = my_plat_remove,
.driver = {
.owner = THIS_MODULE,
.name = "my_buttons",
},
};
static int __init platform_drv_init(void)
{
int ret;
ret = platform_driver_register(&my_buttons_drv);
printk (DEVICE_NAME"\tinitialized\n");
return ret;
}
static void __exit platform_drv_exit(void)
{
platform_driver_unregister(&my_buttons_drv);
}
module_init(platform_drv_init);
module_exit(platform_drv_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Z-YP");
應用程式：
mymp3.h:
typedef struct node
{
char data[100];
struct node *left;
struct node *right;
}NODE;
enum modules{mod1,mod2};
enum mp3buttons{pre,start,next,pau,up,down};
NODE *mycreatedoublelist(void);
extern void mp3_display(NODE *,int,int *,int *,int);
extern int module(void);
mp3.c:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/select.h>
#include <sys/time.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <linux/soundcard.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include "mymp3.h"
int main(void)
{
int buttons_fd,mix_fd;
int iLeft = 0;
int iRight = 0;
int iLevel;
int volume = 75;
iLeft = iRight = volume;
iLevel = (iRight << 8) + iLeft;
int mod;
int ret;
int sta = 0;
int isstart = 0;
int rand;
int flg = 0;
int num = 0;
int stop = 0;
char play[60];
NODE *shmptr = NULL;
int shmid;
NODE *head = mycreatedoublelist();
NODE *p = head;
mod = module();
mp3_display(head,10,&volume,&flg,mod);
char buttons[6] = {'0', '0', '0', '0', '0', '0'};
buttons_fd = open("/dev/my_buttons",0);
if (buttons_fd < 0)
{
perror("open device buttons\n");
exit(1);
}
mix_fd = open("/dev/mixer",O_WRONLY);
if(mix_fd < 0)
{
perror("open device mixer\n");
exit(1);
}
ioctl(mix_fd,MIXER_WRITE(SOUND_MIXER_VOLUME),&iLevel);
shmid = shmget(IPC_PRIVATE,sizeof(NODE),0777);
shmptr = (NODE *)shmat(shmid,0,0);
memcpy(shmptr,p,sizeof(NODE));
for (;;)
{
char current_buttons[6];
int count_of_changed_key;
int i;
int changeflg = 0;
pid_t pid,playpid;
if (read(buttons_fd, current_buttons, sizeof current_buttons) != sizeof current_buttons)
{
perror("read buttons:");
exit(1);
}
for (i = 0, count_of_changed_key = 0; i < sizeof buttons / sizeof buttons[0]; i++)
{
if (buttons[i] != current_buttons[i])
{
buttons[i] = current_buttons[i];
if(buttons[i] == '1')
{
;
}
else
{
switch(i)
{
case pau:
{
if(isstart != 0)
{
if(stop == 0)
{
system("killall -STOP madplay &");
kill(pid,19);
stop = 1;
}
else
{
printf("haved stopped!\n");
sleep(1);
}
mp3_display(shmptr,pau,&volume,&flg,mod);
}
else
{
printf("Please input start frist!\n");
sleep(1);
}
break;
}
case pre:
{
if(num != 0)
{
kill(pid,9);
system("killall -STOP madplay &");
system("killall -9 madplay &");
num = 0;
}
if(mod == 1)
{
p = shmptr;
p = p->left;
memset(shmptr,0,sizeof(NODE));
memcpy(shmptr,p,sizeof(NODE));
}
else
{
rand = random() % 14 + 1;
while(rand--)
{
p = shmptr;
p = p->left;
memset(shmptr,0,sizeof(NODE));
memcpy(shmptr,p,sizeof(NODE));
}
}
changeflg = 1;
}
case next:
{
if(changeflg != 1)
{
if(num != 0)
{
kill(pid,9);
system("killall -STOP madplay &");
system("killall -9 madplay &");
num = 0;
}
if(mod == 1)
{
p = shmptr;
p = p->right;
memset(shmptr,0,sizeof(NODE));
memcpy(shmptr,p,sizeof(NODE));
}
else
{
rand = random() % 14 + 1;
while(rand--)
{
p = shmptr;
p = p->right;
memset(shmptr,0,sizeof(NODE));
memcpy(shmptr,p,sizeof(NODE));
}
}
}
}
case start:
{
if(stop == 1)
{
system("killall -CONT madplay &");
kill(pid,18);
stop = 0;
mp3_display(shmptr,start,&volume,&flg,mod);
}
else
{
if(num != 0)
{
system("killall -STOP madplay &");
system("killall -9 madplay &");
kill(pid,9);
num = 0;
}
pid = fork();
if(pid < 0)
{
perror("fork error\n");
}
else if(pid == 0)
{
loopv:
playpid = fork();
if(playpid < 0)
{
perror("fork2 error\n");
}
else if(playpid == 0)
{
execl("/music/madplay","./madplay",shmptr->data,NULL);
}
wait(&sta);
if(WIFEXITED(sta) != 0)
{
p = shmptr;
p = p->right;
memset(shmptr,0,sizeof(NODE));
memcpy(shmptr,p,sizeof(NODE));
mp3_display(shmptr,start,&volume,&flg,mod);
goto loopv;
}
else
{
mp3_display(shmptr,start,&volume,&flg,mod);
goto loopv;
}
}
else
{
changeflg = 0;
num = 1;
mp3_display(shmptr,start,&volume,&flg,mod);
}
}
isstart = 1;
break;
}
case up:
{
mp3_display(shmptr,up,&volume,&flg,mod);
iLeft = iRight = volume;
iLevel = (iRight << 8) + iLeft;
ioctl(mix_fd,MIXER_WRITE(SOUND_MIXER_VOLUME),&iLevel);
break;
}
case down:
{
mp3_display(shmptr,down,&volume,&flg,mod);
iLeft = iRight = volume;
iLevel = (iRight << 8) + iLeft;
ioctl(mix_fd,MIXER_WRITE(SOUND_MIXER_VOLUME),&iLevel);
break;
}
default:
{
break;
}
}
count_of_changed_key++;
}
}
}
if (count_of_changed_key)
{
printf("\n");
}
}
shmctl(shmid,IPC_RMID,NULL);
close(mix_fd);
close(buttons_fd);
return 0;
}
mp3_display.c:
#include <stdio.h>
#include <stdlib.h>
#include "mymp3.h"
void mp3_display(NODE *p,int choose,int *volume,int *flg,int mod)
{
system("clear");
switch(choose)
{
case start:
{
*flg = 1;
break;
}
case pau:
{
*flg = 0;
break;
}
case up:
{
if(*volume == 100)
{
printf("Volume is already max!\n");
sleep(1);
system("clear");
}
else
{
*volume = *volume + 5;
}
break;
}
case down:
{
if(*volume == 0)
{
printf("Volume is already min!\n");
sleep(1);
system("clear");
}
else
{
*volume = *volume - 5;
}
break;
}
case pre:
{
break;
}
case next:
{
break;
}
default:
{
break;
}
}
printf("\n-----------------------------------------------------------------------------\n");
printf("\n\t\t\t\tZYP MP3 Player\n");
printf("\t\t Pre :%s\n",(mod == 1) ? (p->left->data) : ("Random......"));
printf("\t\t Current:%s\n",p->data);
printf("\t\t Next :%s\n",(mod == 1) ? (p->right->data) : ("Random......"));
printf("\t\t Volume:%d\n",*volume);
if(*flg == 0)
{
printf("\t\t Pause......\n");
}
else
{
printf("\t\t Playing......\n");
}
printf("\n-----------------------------------------------------------------------------\n");
printf("\t K1:pre \t\t\tK2:start \n");
printf("\t K3:next \t\t\tK4:pause \n");
printf("\t K5:up \t\t\tK6:down \n");
}
mp3_doubledir.c:
#include<stdio.h>
#include<string.h>
#include<fcntl.h>
#include<dirent.h>
#include<stdlib.h>
#include "mymp3.h"
NODE * mycreatedoublelist()
{
int i = 1;
int j = 0;
char * buffer[20];
for(;j < 20; j++)
{
buffer[j] = (char *)malloc(50);
}
j = 0;
DIR *mydir;
struct dirent *myitem;
mydir = opendir("/music");
while((myitem = readdir(mydir)) != NULL)
{
if((strcmp(myitem->d_name,"mymp3") == 0) || (strcmp(myitem->d_name,"madplay") == 0) || (strcmp(myitem->d_name,".") == 0) || (strcmp(myitem->d_name,"..") == 0))
{
continue;
}
strcpy(buffer[j],myitem->d_name);
j++;
}
NODE *last;
NODE *head = (struct node *)malloc(sizeof(struct node));
head->left = head;
head->right = head;
strcpy(head->data,buffer[0]);
last = head;
for(i = 2;i <= j;i++)
{
NODE *p = (struct node *)malloc(sizeof(struct node));
head->left = p;
p->right = head;
last->right = p;
p->left = last;
strcpy(p->data,buffer[i-1]);
last = p;
}
return head;
}
mp3_module.c:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/select.h>
#include <sys/time.h>
#include <errno.h>
#include "mymp3.h"
int module(void)
{
system("clear");
printf("\n\n\n\n\n\n\n\n");
printf("\n-------------------------------------------------------------------------------\n");
printf("\n\t\t\t\tZYP MP3 Player\n");
printf("\n-------------------------------------------------------------------------------\n");
sleep(2);
int buttons_fd;
char buttons[6] = {'0', '0', '0', '0', '0', '0'};
buttons_fd = open("/dev/my_buttons",0);
if (buttons_fd < 0)
{
perror("open device buttons\n");
exit(1);
}
for (;;)
{
system("clear");
printf("\n-------------------------------------------------------------------------------\n");
printf("\n\n\n\t\t\t\tMODULES:\n");
printf("\t\t 1.In order\n");
printf("\t\t 2.Random\n");
printf("\n-------------------------------------------------------------------------------\n");
printf("\n\t\tPlease select module:\n");
char current_buttons[6];
int count_of_changed_key;
int i;
if (read(buttons_fd, current_buttons, sizeof current_buttons) != sizeof current_buttons)
{
perror("read buttons:");
exit(1);
}
for (i = 0, count_of_changed_key = 0; i < sizeof buttons / sizeof buttons[0]; i++)
{
if (buttons[i] != current_buttons[i])
{
buttons[i] = current_buttons[i];
if(buttons[i] == '1')
{
;
}
else
{
switch(i)
{
case mod1:
{
goto loop1;
}
case mod2:
{
goto loop2;
}
default:
{
printf("\n\n\t\tNo such module!\n");
sleep(1);
break;
}
}
//printf("%skey %d is %s", count_of_changed_key ? ", ": "", i+1, buttons[i] == '0' ? "up" : "down");
count_of_changed_key++;
}
}
}
if (count_of_changed_key)
{
printf("\n");
}
}
close(buttons_fd);
loop1:
close(buttons_fd);
printf("\n\n\t\tYou choose mod1!\n");
sleep(2);
return 1;
loop2:
close(buttons_fd);
printf("\n\n\t\tYou choose mod2!\n");
sleep(2);
return 2;
}
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