First aid! Write makefile of gpio driver

First aid! For details about how to compile the makefile of the gpio driver-Linux general technology-Linux technology and application information, see the following. I need to use the GPIO interface to control the stepper motor. The gpio driver code adds the pin control I need according to the \ drivers \ char \ EmbedSky_gpio.c code under the source code of the kernel code liux2.6.30.4. The modification is as follows.
Static unsigned long gpio_table [] =
{
S3C2410_GPB5,
S3C2410_GPB6,
S3C2410_GPB7,
S3C2410_GPB8,
S3C2410_GPF3,
S3C2410_GPG5,
S3C2410_GPG7,
};
Static unsigned int gpio_cfg_table [] =
{
S3C2410_GPB5_OUTP,
S3C2410_GPB6_OUTP,
S3C2410_GPB7_OUTP,
S3C2410_GPB8_OUTP,
S3C2410_GPF3_OUTP,
S3C2410_GPG5_OUTP,
S3C2410_GPG7_OUTP,
};
However, an error occurred during makefile Compilation: The content of makfe is:
Ifneq ($ (KERNELRELEASE ),)
Obj-m: = gpio. o
Else
KERNELDIR? =/Kernel/opt/EmbedSky/linux-2.6.30.4 (/* kernel path in pc */)
PWD: = $ (shell pwd)
Default:
$ (MAKE)-C $ (KERNELDIR) M = $ (PWD) modules
Clean:
Rm-rf *. o *~ Core. depend. *. cmd *. ko *. mod. c
Endif
Compilation error:
No rule to make target '/home/mmx/gpio. C', needed by/home/mmx/gpio. o/. stop