[root@FriendlyARM /]# ./led 1 0
Unable to handle kernel paging request at virtual address 7afffff4
pgd = c3b20000
[7afffff4] *pgd=00000000
Internal error: Oops: 5 [#1]
last sysfs file: /sys/devices/virtual/misc/dynamo/dev
Modules linked in: dynamo
CPU: 0 Not tainted (2.6.32.2-FriendlyARM #1)
PC is at s3c2410_gpio_setpin+0x24/0x44
LR is at sbc2440_dynamos_ioctl+0x34/0x40 [dynamo]
pc : [<c0039e34>] lr : [<bf000034>] psr: 80000093
sp : c3ad3ebc ip : c3ad3ed0 fp : c3ad3ecc
r10: 00000000 r9 : c3ad2000 r8 : c0030088
r7 : 00000003 r6 : 00000000 r5 : 00000000 r4 : c3b13380
r3 : 80000013 r2 : 7afffff0 r1 : 00000001 r0 : fffffff1
Flags: Nzcv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user
Control: c000717f Table: 33b20000 DAC: 00000015
Process led (pid: 723, stack limit = 0xc3ad2270)
Stack: (0xc3ad3ebc to 0xc3ad4000)
3ea0: c3b13380
3ec0: c3ad3edc c3ad3ed0 bf000034 c0039e20 c3ad3efc c3ad3ee0 c00a7a2c bf000010
3ee0: 00000001 00000001 00000000 00000003 c3ad3f7c c3ad3f00 c00a7ce8 c00a79c8
3f00: c002f1e0 c0036ba0 00000000 c3adef38 00000001 08100877 c3acc780 00000001
3f20: 00000000 c3b13380 c3a9af04 00000000 c3ad3f64 c3ad3f40 c00afb7c c3b00000
3f40: 00000003 ffffff9c 00000000 00000000 c3ad2000 c3b13380 00000001 00000000
3f60: 00000003 c0030088 c3ad2000 00000000 c3ad3fa4 c3ad3f80 c00a8290 c00a7c8c
3f80: 00000005 00000000 000086cc 00000000 0000849c 00000036 00000000 c3ad3fa8
3fa0: c002fee0 c00a8260 000086cc 00000000 00000003 00000000 00000001 00000001
3fc0: 000086cc 00000000 0000849c 00000036 00000000 00000000 40025000 be8a3d44
3fe0: 00000000 be8a3d28 00008698 400e4cac 60000010 00000003 33cc33cc 33cc33cc
Backtrace:
[<c0039e10>] (s3c2410_gpio_setpin+0x0/0x44) from [<bf000034>] (sbc2440_dynamos_i
octl+0x34/0x40 [dynamo])
r4:c3b13380
[<bf000000>] (sbc2440_dynamos_ioctl+0x0/0x40 [dynamo]) from [<c00a7a2c>] (vfs_io
ctl+0x74/0x7c)
[<c00a79b8>] (vfs_ioctl+0x0/0x7c) from [<c00a7ce8>] (do_vfs_ioctl+0x6c/0x5d4)
r7:00000003 r6:00000000 r5:00000001 r4:00000001
[<c00a7c7c>] (do_vfs_ioctl+0x0/0x5d4) from [<c00a8290>] (sys_ioctl+0x40/0x68)
[<c00a8250>] (sys_ioctl+0x0/0x68) from [<c002fee0>] (ret_fast_syscall+0x0/0x28)
r7:00000036 r6:0000849c r5:00000000 r4:000086cc
Code: e121f002 e3c0201f e1a020a2 e28224fb (e592c004)
---[ end trace 693773a0693773a0 ]---
Segmentation fault
[root@FriendlyARM /]#
驱动程序
！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <asm/irq.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/gpio.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include <asm/unistd.h>
#define MISC_DYNAMIC_DYNAMO 71
#define DEVICE_NAME "dynamo"
static unsigned long dynamo_table [] = {
S3C2410_GPG(0),
S3C2410_GPG(3),
};
static unsigned int dynamo_cfg_table [] = {
S3C2410_GPIO_OUTPUT,
S3C2410_GPIO_OUTPUT,
};
static int sbc2440_dynamos_ioctl(
struct inode *inode,
struct file *file,
unsigned int cmd,
unsigned long arg)
{
switch(cmd) {
case 0:
case 1:
if (arg > 2) {
return -EINVAL;
}
s3c2410_gpio_setpin(dynamo_cfg_table[arg], !cmd);
return 0;
default:
return -EINVAL;
}
}
static struct file_operations dev_fops = {
.owner = THIS_MODULE,
.ioctl = sbc2440_dynamos_ioctl,
};
static struct miscdevice misc = {
.minor = MISC_DYNAMIC_DYNAMO,
.name = DEVICE_NAME,
.fops = &dev_fops,
};
static int __init dev_init(void)
{
int ret;
int i;
for (i = 0; i < 2; i++) {
s3c2410_gpio_cfgpin(dynamo_table
, dynamo_cfg_table);
s3c2410_gpio_setpin(dynamo_table, 0);
}
ret = misc_register(&misc);
printk (DEVICE_NAME"\tinitialized\n");
return ret;
}
static void __exit dev_exit(void)
{
misc_deregister(&misc);
}
module_init(dev_init);
module_exit(dev_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("FriendlyARM YUMMEN");
测试程序！！！！！
#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 <string.h>
static int led_fd;
static int type = 1;
static int period = 1;
static void push_leds(void)
{
switch(type)
{
case 0:
{
ioctl(led_fd, 1, 0);
ioctl(led_fd, 0, 1);
}
break;
case 1:
{
ioctl(led_fd, 0, 0);
ioctl(led_fd, 1, 1);
}
break;
default:
{
ioctl(led_fd, 0, 0);
ioctl(led_fd, 0, 1);
}
}
}
int main(void)
{
int led_control_pipe;
int null_writer_fd; // for read endpoint not blocking when control process exit
led_fd = open("/dev/dynamo", 0);
if (led_fd < 0)
{
led_fd = open("/dev/dynamo", 0);
}
if (led_fd < 0)
{
perror("open device dynamo");
exit(1);
}
unlink("/tmp/led-control");
mkfifo("/tmp/led-control", 0666);
led_control_pipe = open("/tmp/led-control", O_RDONLY | O_NONBLOCK);
if (led_control_pipe < 0)
{
perror("open control pipe for read");
exit(1);
}
null_writer_fd = open("/tmp/led-control", O_WRONLY | O_NONBLOCK);
if (null_writer_fd < 0)
{
perror("open control pipe for write");
exit(1);
}
for (;;)
{
fd_set rds;
int ret;
FD_ZERO(&rds);
FD_SET(led_control_pipe, &rds);
ret = select(led_control_pipe + 1, &rds, NULL, NULL, NULL);
if (ret < 0)
{
perror("select");
exit(1);
}
if (ret == 0)
{
push_leds();
}
else if (FD_ISSET(led_control_pipe, &rds))
{
static char buffer[200];
for (;;)
{
char c;
int len = strlen(buffer);
if (len >= sizeof buffer - 1)
{
memset(buffer, 0, sizeof buffer);
break;
}
if (read(led_control_pipe, &c, 1) != 1)
{
break;
}
if (c == '\r')
{
continue;
}
if (c == '\n')
{
int tmp_type;
double tmp_period;
if (sscanf(buffer,"%d%lf", &tmp_type, &tmp_period) == 2)
{
type = tmp_type;
period = tmp_period;
}
fprintf(stderr, "type is %d, period is %d\n", type, period);
memset(buffer, 0, sizeof buffer);
break;
}
buffer[len] = c;
}
}
}
close(led_fd);
return 0;
}
希望有人可以帮助我啊！！！！！！！！！！！！新手求助！！！！！！！！！！！！！！！！！！！！！！！！
