[经验]

RK3288驱动之GPIOCTRL开发过程记录

王英

2022-8-12 17:05:55

4320 Android系统 RK3288 GPIO

给驱动节点更改权限：
在android目录文件里system/core/rootdir/ueventd.rc
添加

niuyi

/dev/gpioctrl 0666 root root

arch/arm/configs/x3288_defconfig
CONFIG_GPIOCTRL=y

drivers/Makefile
obj-$(CONFIG_NOVA) += nova/

drivers/Kconfig
source "drivers/nova/Kconfig"

drivers/nova/Makefile
obj-$(CONFIG_GPIOCTRL) += gpioctrl.o

drivers/nova/Kconfig
config GPIOCTRL
tristate "misc gpio Driver"
default y
help
This is the gpio driver for misc.

kernel/arch/arm/boot/dts/rk3288-pinctrl.dtsi
pinctrl: pinctrl@ff770000 {
// niuyi
gpioctrl{
compatilbe = "rockchip,gpioctrl";
// gpionum = "2";
// gpio1 = <&gpio8 GPIO_A2 GPIO_ACTIVE_LOW>;
// gpio2 = <&gpio8 GPIO_A1 GPIO_ACTIVE_LOW>;
// status = "okay";
};
};

驱动源码：

/*
drivers/nova/gpioctrl.c
./out/target/product/rk3288/obj/EXECUTABLES/misctest_intermediates/misctest
./out/target/product/rk3288/symbol/system/bin/misctest
*/

#include
#include
#include
#include
#include
//#include
//#include //kcalloc,kzalloc等内存分配函数
//---------ioctl------------
#include
//---------misc_register----
#include
//----------cdev--------------
#include
//----------delay-------------
#include
//----------GPIO---------------
//#include
//#include
//#include

#ifdef CONFIG_OF
#include
#include
#endif

#define GPIOCTRL_DEVICE_NAME "gpioctrl"

//static int gpioctrl_gpios[10];
//static int gpionum=0;

static long gpioctrl_ioctl(struct file *filp, unsigned int cmd,unsigned long arg)
{
switch(cmd) {
case 0:
case 1:
printk("NY:gpioctrl_ioctl %d - %ld.\n",cmd,arg);
//gpio_set_value(led_gpios[arg], !cmd);//用户选定的LED并设置值
return 0x33;
break;
default:
return -EINVAL;
}
return 0;
}
static struct file_operations gpioctrl_drv_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = gpioctrl_ioctl,
};
static struct miscdevice gpioctrl_drv = {
.minor = MISC_DYNAMIC_MINOR,
.name = GPIOCTRL_DEVICE_NAME,
.fops = &gpioctrl_drv_fops,
};