platform和led中断项目

设备树根节点下添加 

    myledIrqPlatform{compatible="hqyj,myledIrqPlatform";reg=<0x22334455 59>;interrupt-parent=<&gpiof>;interrupts=<9 0>;led1-gpio=<&gpioe 10 0>;//10表示使用的gpioe第几个管脚  0，表示gpio默认属性};

驱动程序代码

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mod_devicetable.h>
#include <linux/of_gpio.h>
#include <linux/interrupt.h>struct resource *res;
unsigned int irqno;//中断号
struct gpio_desc *gpiono;
unsigned int number = 0;// 定义中断处理函数
irqreturn_t key_handler(int irq, void *dev)
{printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);int which = (int)dev;printk("which=%d number=%d\n",which,number);//灯状态取反gpiod_set_value(gpiono,!gpiod_get_value(gpiono));//变量 在 0 或 1之间切换number = (number == 0) ? 1 : 0;return IRQ_HANDLED;
}// 封装probe函数
int pdrv_probe(struct platform_device *pdev){//设备树匹配成功后，设备树节点指针可以通过pdev->dev.of_node获取//基于设备树节点信息获取gpio_desc对象指针//申请GPIO LED1灯gpiono = gpiod_get_from_of_node(pdev->dev.of_node,"led1-gpio",0,GPIOD_OUT_HIGH,NULL);if(IS_ERR(gpiono)){printk("解析GPIO管脚信息失败\n");return -ENXIO;}printk("解析GPIO管脚信息成功\n");//获取软中断号  irqno = platform_get_irq(pdev,0);if(irqno < 0){printk("获取中断LED类型资源失败\n");return -ENXIO;}printk("irq资源/软中断号%d\n",irqno);printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);// 注册中断  按键KEY1 PE10int ret = request_irq(irqno, key_handler, IRQF_TRIGGER_FALLING|IRQF_SHARED, "key_int", (void *)1);if (ret < 0){printk("注册按键1中断失败\n");return ret;}printk("注册按键1中断成功\n");return 0;
}int pdrv_remove(struct platform_device *pdev){// 注销中断 按键KEY1 PE10free_irq(irqno, 0);//灭灯gpiod_set_value(gpiono,0);//释放GPIO信息 LEDgpiod_put(gpiono);printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);return 0;
}//构建设备树匹配表
struct of_device_id oftable[] = {{.compatible = "hqyj,myledIrqPlatform"},{},//防止数组越界
};// 定义驱动信息对象并初始化
struct platform_driver pdrv = {.probe = pdrv_probe,.remove = pdrv_remove,.driver = {.name = "bbbbb",.of_match_table = oftable,//用于设备树匹配},
};//一键注册宏
module_platform_driver(pdrv);
MODULE_LICENSE("GPL");