linux platform tree下hs0038驱动程序

/*************************************************************** Copyright 2024-2029. All rights reserved. 文件名 : drv_09_tree_hs0038.c 作者 : [email protected] 版本 : V1.0 描述 : HS0038 驱动程序, GPIO4_PIN17-----HS0038 IO port 其他 : 无 日志 : 初版V1.0 2024/1/30 使用方法： 1) 在.dts文件中定义节点信息 //mftang: user's HS0038, 2024-1-30 // IO: GPIO-4-PIN17 mftanghs0038 { compatible = "atk-dl6y2c,hs0038"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_gpio_mftanghs0038>; gpios = <&gpio4 17 GPIO_ACTIVE_HIGH>; status = "okay"; }; 2) 在驱动匹配列表 static const struct of_device_id hs0038_of_match[] = { { .compatible = "atk-dl6y2c,hs0038" }, { } // Sentinel }; 驱动程序用法： typedef struct{ int code; int sign; // -1: error, 0: success }HS0038Stru; HS0038Stru stru_hs0038; if (read(fd, &stru_hs0038, sizeof( HS0038Stru )) == sizeof( HS0038Stru )) { if( !stru_hs0038.sign ) { printf("get hs0038 : 0x%x \r\n", stru_hs0038.code); } } ***************************************************************/ #include <linux/types.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/ide.h> #include <linux/init.h> #include <linux/module.h> #include <linux/errno.h> #include <linux/gpio.h> #include <linux/cdev.h> #include <linux/device.h> #include <linux/of_gpio.h> #include <linux/semaphore.h> #include <linux/timer.h> #include <linux/irq.h> #include <linux/wait.h> #include <linux/poll.h> #include <linux/fs.h> #include <linux/fcntl.h> #include <linux/platform_device.h> #include <linux/irq.h> #include <linux/ktime.h> #include <asm/mach/map.h> #include <asm/uaccess.h> #include <asm/io.h> #define DEVICE_NAME "treehs0038" // dev/treehs0038 #define OFF 0 #define ON 1 /* hs0038dev设备结构体 */ struct hs0038stru_dev{ dev_t devid; /* 设备号 */ struct cdev cdev; /* cdev */ struct class *class; /* 类 */ struct device *device; /* 设备 */ int major; /* 主设备号 */ struct device_node *node; /* hs0038设备节点 */ int userhs0038; /* hs0038 GPIO标号*/ struct gpio_desc *pin; }; struct hs0038stru_dev hs0038dev; /* hs0038设备 */ typedef struct{ int code; int sign; // -1: error, 0: sucess }HS0038Stru; HS0038Stru stru_hs0038; static u64 hs0038_edge_time[100]; static wait_queue_head_t hs0038_wq; static int irq; static int hs0038_edge_cnt = 0; static unsigned int hs0038_data = 0; static unsigned int hs0038_data_buf[8]; static int r, w; static void put_data(unsigned int val) { if (((w+1) & 7) != r) { hs0038_data_buf[w] = val; w = (w + 1) & 7; } } static int get_data(unsigned int *val) { if (r == w) { return -1; } else { *val = hs0038_data_buf[r]; r = (r + 1) & 7; return 0; } } static int has_data(void) { if (r == w) return 0; else return 1; } int hs0038_parse_data(unsigned int *val) { u64 tmp; unsigned char data[4]; int i, j, m; /* 判断是否重复码 */ if (hs0038_edge_cnt == 4) { tmp = hs0038_edge_time[1] - hs0038_edge_time[0]; if (tmp > 8000000 && tmp < 10000000) { tmp = hs0038_edge_time[2] - hs0038_edge_time[1]; if (tmp < 3000000) { /* 获得了重复码 */ *val = hs0038_data; return 0; } } } /* 接收到了68次中断 */ m = 3; if (hs0038_edge_cnt >= 68) { /* 解析到了数据 */ for (i = 0; i < 4; i++) { data[i] = 0; /* 先接收到bit0 */ for (j = 0; j < 8; j++) { /* 数值: 1 */ if (hs0038_edge_time[m+1] - hs0038_edge_time[m] > 1000000) data[i] |= (1<<j); m += 2; } } /* 检验数据 */ data[1] = ~data[1]; if (data[0] != data[1]) { return -2; } data[3] = ~data[3]; if (data[2] != data[3]) { return -2; } hs0038_data = (data[0] << 8) | (data[2]); *val = hs0038_data; return 0; } else { /* 数据没接收完毕 */ return -1; } } static irqreturn_t hs0038_isr(int irq, void *dev_id) { unsigned int val; int ret; hs0038_edge_time[hs0038_edge_cnt++] = ktime_get_boot_ns(); /* 判断超时 */ if (hs0038_edge_cnt >= 2) { if (hs0038_edge_time[hs0038_edge_cnt-1] - hs0038_edge_time[hs0038_edge_cnt-2] > 60000000) { /* 超时 */ hs0038_edge_time[0] = hs0038_edge_time[hs0038_edge_cnt-1]; hs0038_edge_cnt = 1; return IRQ_HANDLED; // IRQ_WAKE_THREAD; } } ret = hs0038_parse_data(&val); if (!ret) { /* 解析成功 */ hs0038_edge_cnt = 0; printk("%s line %d : get ir code = 0x%x \r\n", __FUNCTION__, __LINE__, val); put_data(val); wake_up(&hs0038_wq); stru_hs0038.code = val; stru_hs0038.sign = 0; } else if (ret == -2) { /* 解析失败 */ stru_hs0038.sign = -1; hs0038_edge_cnt = 0; } return IRQ_HANDLED; // IRQ_WAKE_THREAD; } /* linux driver 驱动接口： 实现对应的open/read/write等函数，填入file_operations结构体 */ static ssize_t hs0038_drv_read (struct file *file, char __user *buf, size_t size, loff_t *offset) { unsigned int val; int err; printk(" %s line %d \r\n", __FUNCTION__, __LINE__); wait_event_interruptible(hs0038_wq, has_data()); get_data(&val); err = copy_to_user(buf, &stru_hs0038, sizeof(HS0038Stru)); return sizeof(HS0038Stru); } static int hs0038_drv_close(struct inode *node, struct file *file) { printk(" %s line %d \r\n", __FUNCTION__, __LINE__); return 0; } static int hs0038_drv_open(struct inode *inode, struct file *filp) { filp->private_data = &hs0038dev; /* 设置私有数据 */ return 0; } /* 定义driver的file_operations结构体 */ static struct file_operations hs0038_fops = { .owner = THIS_MODULE, .read = hs0038_drv_read, .open = hs0038_drv_open, .release = hs0038_drv_close, }; /* 1. 从platform_device获得GPIO * 2. gpio=>irq * 3. request_irq */ static int hs0038_probe(struct platform_device *pdev) { int result; printk("hs0038 driver and device was matched!\r\n"); /* 1. 获得硬件信息 */ hs0038dev.pin = gpiod_get(&pdev->dev, NULL, 0); if (IS_ERR(hs0038dev.pin)) { printk("%s line %d get pin parameter error! \n", __FUNCTION__, __LINE__); } /* register irq*/ irq = gpiod_to_irq(hs0038dev.pin); result = request_irq(irq, hs0038_isr, IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING, "hs0038", NULL); /* 2. device_create */ device_create( hs0038dev.class, NULL, MKDEV( hs0038dev.major, 0 ), NULL, DEVICE_NAME); // device name return 0; } static int hs0038_remove(struct platform_device *pdev) { printk("%s line %d\n", __FUNCTION__, __LINE__); device_destroy( hs0038dev.class, MKDEV( hs0038dev.major, 0)); free_irq(irq, NULL); gpiod_put(hs0038dev.pin); return 0; } static const struct of_device_id atk_dl6y2c_hs0038[] = { { .compatible =