GT2440按鍵驅動新增fasync機制

完整驅動**如下：

#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define module_name_irq		"button_fasync"

#define button_irq_major	210
static struct class *btn_fasync_class;
static unsigned char key_vals[4] = ;
static declare_wait_queue_head(btn_fasync_waitq);
static define_mutex(btn_lock);
static volatile int ev_press = 0;
struct fasync_struct *btn_fasync_queue;
struct btn_fasync_desc ;
static struct btn_fasync_desc btns_irq_desc = , /* k1 */
, /* k2 */
, /* k3 */
/* k4 */
};static irqreturn_t irq_interrupt(int irq, void *dev_id)
return irq_retval(irq_handled);
}static int btn_fasync_open (struct inode *inode, struct file *file)
request_irq(btns_irq_desc[i].irq_num, irq_interrupt, irq_type_edge_both,
btns_irq_desc[i].btn_name,(void *)&btns_irq_desc[i]);	}	
return 0;
}static ssize_t btn_fasync_read (struct file *filp, char __user *buf, size_t count, loff_t *ppos)
ev_press = 0;
cnt = copy_to_user(buf, (const void *)key_vals, min(sizeof(key_vals), count));
return cnt ? -efault : min(sizeof(key_vals), count);
}static int btn_fasync_close (struct inode *inode, struct file *file)
free_irq(btns_irq_desc[i].irq_num, (void *)&btns_irq_desc[i]);	
}	up(&btn_lock);
return 0;
}static unsigned int btn_poll (struct file *file, struct poll_table_struct *wait)
static int btn_fasync (int fd, struct file *filp, int on)
static struct file_operations btn_fasync_fops = ;
static int __init __btn_fasync_init(void)
static void __exit __btn_fasync_exit(void)
module_init(__btn_fasync_init);
module_exit(__btn_fasync_exit);
module_license("gpl");
module_author("[email protected]");
module_description("button irq_module test for gt2440 board");

完整測試程式如下：

#include #include #include #include #include #include #include #include int  fd;

void button_signal_func(int signal_num)
;	unsigned char key_tmp_vals[4];
signal_num = signal_num;
if (read(fd, key_tmp_vals, sizeof(key_tmp_vals)) != sizeof(key_tmp_vals)) 
for (i = 0; i < sizeof(key_vals)/sizeof(key_vals[0]); i++) 	}}
int main(int argv,char **argc)
fcntl(fd, f_setown, getpid());
oflags = fcntl(fd, f_getfl);
fcntl(fd, f_setfl, oflags | fasync);
while (1)
return 0;
}

makefile如下：

ifeq ($(kernelrelease),)

#	learn to write makefile for driver
kern_version = /opt/gtstudio/gt2440/linux-2.6.38.6
pwd := $(shell pwd)
#specify flags for the module compilation.
#extar_cflags = -g -o0
#	build kernerl module
modules:
$(make) -c $(kern_version) m=$(pwd) modules
modules_install:
$(make) -c $(kern_version) m=$(pwd) modules_install
clean:
rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions module* modules*
.phony: modules modules_install clean
else 
#	kernel module
obj-m += btn_fasync_dev.o
endif

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