I am trying to build a multiple file module. The child file is empty. Just stubs. I am seeing the following syntax for the make file online.
obj-m += durationTimer.o
durationTimer-objs := test.o
I have overhead code to register a device number. When I have a single file, I see my print statements and my device. When I add the second file I see neither. When I run lsmod I do see my module.
static int __init init_duration_timer_module(void)
{
printk("DurationTimer module loading\n");
if(alloc_chrdev_region(&my_device_num, 0, 1, DRIVER_NAME) < 0)
{
printk("Device Number Allocation Failed\n");
return (-1);
}
printk("Duration Timer Device Number - Major: %d Minor: %d\n", (my_device_num >> 20), (my_device_num &0xfffff));
my_class = class_create(THIS_MODULE, DRIVER_CLASS);
if(my_class == NULL)
{
printk("Device Class Create Failed\n");
goto CLASS_ERROR;
}
if(device_create(my_class, NULL, my_device_num, NULL, DRIVER_NAME) == NULL)
{
printk("Device File Create Failed\n");
goto FILE_ERROR;
}
cdev_init(&my_device, &fops);
if(cdev_add(&my_device, my_device_num, 1) == (-1))
{
printk("Device Registration Failed\n");
goto ADD_ERROR;
}
printk("DurationTimer module loaded\n");
return 0;
ADD_ERROR:
device_destroy(my_class, my_device_num);
FILE_ERROR:
class_destroy(my_class);
CLASS_ERROR:
unregister_chrdev(my_device_num, DRIVER_NAME);
return (-1);
}
