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fireprime-rk3128 android app 通过jni控制GPIO的代码
发表于 2015-8-25 17:23:18
浏览:188338
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本帖最后由 carlinluo 于 2015-8-25 17:27 编辑
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- #include <dt-bindings/gpio/gpio.h>
- #include <linux/gpio.h>
- #include <linux/of_gpio.h>
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/platform_device.h>
- #include <linux/fb.h>
- #include <linux/backlight.h>
- #include <linux/err.h>
- #include <linux/pwm.h>
- #include <linux/pwm_backlight.h>
- #include <linux/slab.h>
- #include <linux/device.h>
- #include <linux/miscdevice.h>
- #include <asm/uaccess.h>
- static struct UserData{
- int gpio;
- int state;
- };
- static struct of_device_id luobogpio_of_match[] = {
- { .compatible = "luobogpio" },
- { }
- };
- MODULE_DEVICE_TABLE(of, luobogpio_of_match);
- static int luobogpio_open(struct inode *inode, struct file *filp)
- {
- printk("luobogpio_open\n");
- return 0;
- }
- static ssize_t luobogpio_read(struct file *filp, char __user *ptr, size_t size, loff_t *pos)
- {
- if (ptr == NULL)
- printk("%s: user space address is NULL\n", __func__);
- return sizeof(int);
- }
- static long luobogpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
- {
- long ret = 0;
- struct UserData userdata;
- unsigned char label[10];
- printk("luobogpio_ioctl: cmd = %d arg = %ld\n",cmd, arg);
- switch (cmd){
- case 0:
- printk("gpio_request\n");
-
- if (copy_from_user((void*)&userdata,(void __user *)arg, sizeof(struct UserData)))
- return -EFAULT;
- printk("copy_from_user gpio=%d ,state=%d\n",userdata.gpio,userdata.state);
-
- sprintf(label,"gpio-%d",userdata.gpio);
- printk("----->%s\n",label);
- ret = gpio_request(userdata.gpio, label);
- if (ret) {
- printk("failed to request GPIO%d for you ret:%d\n",userdata.gpio,ret);
- }
- break;
- case 1:
-
- printk("gpio_direction_output\n");
-
- if (copy_from_user((void*)&userdata,(void __user *)arg, sizeof(struct UserData)))
- return -EFAULT;
- printk("copy_from_user gpio=%d ,state=%d\n",userdata.gpio,userdata.state);
- ret=gpio_direction_output(userdata.gpio, userdata.state);
- if (ret) {
- printk("failed to gpio_direction_output for you ret:%d\n",userdata.gpio);
- }
- break;
-
- case 5:
- printk("gpio_free\n");
- if (copy_from_user((void*)&userdata,(void __user *)arg, sizeof(struct UserData)))
- return -EFAULT;
- printk("copy_from_user gpio=%d ,state=%d\n",userdata.gpio,userdata.state);
- gpio_free(userdata.gpio);
- break;
-
- default:
- printk("unknown ioctl cmd!\n");
- ret = -EINVAL;
- break;
- }
- return ret;
- }
- static int luobogpio_release(struct inode *inode, struct file *filp)
- {
- printk("luobogpio_release\n");
-
- return 0;
- }
- static struct file_operations luobogpio_fops = {
- .owner = THIS_MODULE,
- .open = luobogpio_open,
- .read = luobogpio_read,
- .unlocked_ioctl = luobogpio_ioctl,
- .release = luobogpio_release,
- };
- static struct miscdevice luobogpio_dev =
- {
- .minor = MISC_DYNAMIC_MINOR,
- .name = "luobogpio",
- .fops = &luobogpio_fops,
- };
- static int luobogpio_probe(struct platform_device *pdev)
- {
- int ret=-1;
- ret = misc_register(&luobogpio_dev);
- if (ret < 0){
- printk("ac_usb_switch register err!\n");
- return ret;
- }
- printk("func: %s\n", __func__);
- return 0;
- }
- static int luobogpio_remove(struct platform_device *pdev)
- {
- //printk("func: %s\n", __func__);
- return 0;
- }
- #ifdef CONFIG_PM_SLEEP
- static int luobogpio_suspend(struct device *dev)
- {
- //printk("func: %s\n", __func__);
- return 0;
- }
- static int luobogpio_resume(struct device *dev)
- {
- //printk("func: %s\n", __func__);
- return 0;
- }
- #endif
- static const struct dev_pm_ops luobogpio_pm_ops = {
- #ifdef CONFIG_PM_SLEEP
- .suspend = luobogpio_suspend,
- .resume = luobogpio_resume,
- .poweroff = luobogpio_suspend,
- .restore = luobogpio_resume,
- #endif
- };
- static struct platform_driver luogpio_driver = {
- .driver = {
- .name = "luobogpio",
- .owner = THIS_MODULE,
- .pm = &luobogpio_pm_ops,
- .of_match_table = of_match_ptr(luobogpio_of_match),
- },
- .probe = luobogpio_probe,
- .remove = luobogpio_remove,
- };
- module_platform_driver(luogpio_driver);
- MODULE_DESCRIPTION("luobogpio Driver");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("platform:luobogpio");
复制代码
JNI
- static jint getGpio(JNIEnv *env, jobject thiz,jint num){
- jint ret=-1;
- UserData userdata;
- memset(&userdata,0x00, sizeof(UserData));
- //strlcpy(userdata.name, "gpio",10);
- userdata.gpio=num;
- userdata.state=0;
- ret = ioctl(fd, CMD_GET_GPIO, &userdata);
- return ret;
- }
- static jint releaseGpio(JNIEnv *env, jobject thiz,jint num){
- jint ret=-1;
- UserData userdata;
- memset(&userdata,0x00, sizeof(UserData));
- userdata.gpio=num;
- userdata.state=0;
- ret = ioctl(fd, CMD_RELEASE_GPIO, &userdata);
- return ret;
- }
- static jint openGpioDev(JNIEnv *env, jobject thiz){
- jint ret=0;
- fd = open("/dev/luobogpio", O_RDWR);
- if (fd < 0) {
- ret=-1;
- }
- return ret;
- }
- static jint closeGpioDev(JNIEnv *env, jobject thiz){
- jint ret=0;
- ret = close(fd);
- if (fd < 0) {
- ret=-1;
- }
- return ret;
- }
- static jint setGpioState(JNIEnv *env, jobject thiz,jint num,jint state) {
- jint err=-1;
- UserData userdata;
- memset(&userdata,0x00, sizeof(UserData));
- userdata.gpio=num;
- userdata.state=state;
- err = ioctl(fd, CMD_SET_GPIO, &userdata);
- if(err<0){
- err=-1;
- }
- return err;
- }
复制代码
APP:
- public class LuoboHardware {
- static {
- // The runtime will add "lib" on the front and ".o" on the end of
- // the name supplied to loadLibrary.
- System.loadLibrary("app");
- }
- public native int add(int a, int b);
- public native int openGpioDev();
- public native int closeGpioDev();
- public native int getGpio(int num);
- public native int releaseGpio(int num);
- public native int setGpioState(int num,int state);
- }
复制代码
写了个简单的应用,可以用以下这些方法控制GPIO了,记得控制的时候,先给驱动节点权限,adb root ->adb shell chmod 777 dev/luobogpio
public native int openGpioDev();
public native int closeGpioDev();
public native int getGpio(int num);
public native int releaseGpio(int num);
public native int setGpioState(int num,int state);
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