OK6410外部中断注册问题

只看该作者 · 2018-8-31 21:02

老师：

我想用中断注册的方式实现按键扫描，但是中断注册总是出错，报错值是-22，请指点下下面代码到底哪有问题，困扰了好几天了，非常感谢。

int ret = 0;

ret = request_irq(IRQ_EINT0_3, ButtonsIRQ, IRQ_TYPE_EDGE_FALLING, &quot;ButtonsG1&quot;, NULL);

if(ret != 0)

printk(&quot;register IRQ_EINT0_3 fail, ret = %d\n&quot;, ret);

ret = 0;

ret = request_irq(IRQ_EINT4_11, ButtonsIRQ, IRQ_TYPE_EDGE_FALLING, &quot;ButtonsG2&quot;, NULL);

if(ret != 0)

printk(&quot;register IRQ_EINT4_11 fail, ret = %d\n&quot;, ret);这种方式注册失败，返回值-22.

#include <linux/module.h>

#include <linux/miscdevice.h>

#include <linux/device.h>

#include <linux/fs.h>

#include <linux/types.h>

#include <linux/moduleparam.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/ioctl.h>

#include <linux/cdev.h>

#include <linux/delay.h>

#include <linux/uaccess.h>

#include <linux/unistd.h>

#include <linux/irq.h>

#include <linux/sched.h>

#include <linux/interrupt.h>

#include <asm/io.h>

#include <asm/irq.h>

#include <asm/types.h>    // for variable types

//Key1-6 GPN0~N5

volatile unsigned long *gpncon;

volatile unsigned long *gpndat;

volatile unsigned long *gpnpud;

static volatile unsigned int ReadFlag = 0;

static DECLARE_WAIT_QUEUE_HEAD(Buttons_WaitQ);

unsigned char KeyVal = 0;

static irqreturn_t ButtonsIRQ(int irq, void *dev_id)

{

printk(&quot;irq = %d\n&quot;, irq);

unsigned long RegVal = *gpndat;

if(irq == IRQ_EINT0_3)

{

      if(RegVal == 0x7e)

         KeyVal = 0;

      else if(RegVal == 0x7d)

         KeyVal = 1;

      else if(RegVal == 0x7b)

         KeyVal = 2;

      else if(RegVal == 0x77)

         KeyVal = 3;

      else if(RegVal == 0x6F)

         KeyVal = 4;

}

else

{

      if(RegVal == 0x5F)

         KeyVal = 5;

}

//wake up to read

ReadFlag = 1;

wake_up_interruptible(&Buttons_WaitQ);

return IRQ_HANDLED;

}

int KeyIntrOpen(const char *pathname, int flags)

{

printk(&quot;Key Intr open\n&quot;);

return 0;

}

int KeyIntrRead(struct file *file, char __user *buf, size_t size, loff_t *ppos)

{

printk(&quot;Key intr read\n&quot;);

if(size != 1)

{

      printk(&quot;You just need to read 1 data\n&quot;);

      return -1;

}

//sleep

wait_event_interruptible(Buttons_WaitQ, ReadFlag);

printk(&quot;There's key event\n&quot;);

copy_to_user(buf, &KeyVal, 1);

ReadFlag = 0;

return 0;

}

static struct file_operations KeyIntrFiles =

{

.owner = THIS_MODULE,

.open = KeyIntrOpen,

.read = KeyIntrRead,

};

int major;

static struct class *KeyIntrClass;

static struct class_device *KeyIntrClassDev;

static struct irqaction Button0_IRQ = {

      .name    = &quot;S3C6410 Intr0-3&quot;,

      .flags = IRQ_TYPE_EDGE_BOTH | IRQF_SHARED,

      .handler = ButtonsIRQ,

};

static struct irqaction Button1_IRQ = {

      .name    = &quot;S3C6410 Intr4-11&quot;,

      .flags = IRQ_TYPE_EDGE_BOTH | IRQF_SHARED,

      .handler = ButtonsIRQ,

};

static int KeyIntrInit()

{

printk(&quot;Key intr Init\n&quot;);

major = register_chrdev(0, &quot;KeyIntr&quot;, &KeyIntrFiles);

//Auto create the node

KeyIntrClass = class_create(THIS_MODULE, &quot;KeyIntr&quot;);

if(IS_ERR(KeyIntrClass))

{

      return PTR_ERR(KeyIntrClass);

}

KeyIntrClassDev = device_create(KeyIntrClass, NULL, MKDEV(major, 0), NULL, &quot;%s&quot;,&quot;KeyIntr&quot;);

gpncon = (volatile unsigned long *)ioremap(0x7F008830, 16);

gpndat = gpncon + 1;

gpnpud = gpncon + 2;

#if 0

int ret = 0;

ret = request_irq(IRQ_EINT0_3, ButtonsIRQ, IRQ_TYPE_EDGE_FALLING, &quot;ButtonsG1&quot;, NULL);

if(ret != 0)

      printk(&quot;register IRQ_EINT0_3 fail, ret = %d\n&quot;, ret);

ret = 0;

ret = request_irq(IRQ_EINT4_11, ButtonsIRQ, IRQ_TYPE_EDGE_FALLING, &quot;ButtonsG2&quot;, NULL);

if(ret != 0)

      printk(&quot;register IRQ_EINT4_11 fail, ret = %d\n&quot;, ret);

#endif

int ret = setup_irq(IRQ_EINT0_3, &Button0_IRQ);

if(ret != 0)

      printk(&quot;setup irq EINT0-3 fail, ret = %d\n&quot;, ret);

else

printk(&quot;setup irq EINT0-3 successful, ret = %d\n&quot;, ret);

ret = 0;

ret = setup_irq(IRQ_EINT4_11, &Button1_IRQ);

if(ret != 0)

      printk(&quot;setup irq EINT4-11 fail, ret = %d\n&quot;, ret);

else

printk(&quot;setup irq EINT4-11 successful, ret = %d\n&quot;, ret);

return 0;

}

static void KeyIntrExit()

{

device_destroy(KeyIntrClass, MKDEV(major, 0));

class_destroy(KeyIntrClass);

unregister_chrdev(major, &quot;ScanKey&quot;);

iounmap(gpncon);

free_irq(IRQ_EINT0_3, NULL);

free_irq(IRQ_EINT4_11, NULL);

printk(&quot;Scan Key exit\n&quot;);

}

module_init(KeyIntrInit);

module_exit(KeyIntrExit);

MODULE_LICENSE(&quot;GPL&quot;);

这可以注册成功，但是不能触发中断。

谢谢！

OK6410外部中断注册问题

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