[作品]

【IMX6UL开发板试用体验】- 项目实战前篇平台总写 & 输入子系统

2017-2-27 06:24:13 6383

0 本帖最后由 290005999 于 2017-2-27 12:33 编辑 1. 本次实验的项目会用到platform 平台总线以及input输入子系统 2.什么是paltform总线一个现实的linux设备和驱动通常都需要挂接在一种总线上，比较常见的总线有USB、PCI总线等。但是，在嵌入式系统里面，SoC系统中集成的独立的外设控制器、挂接在SoC内存空间的外设却不依附与此类总线。基于这样的背景下，2.6内核加入了platform虚拟总线。platform机制将设备本身的资源注册进内核，有内核统一管理，在驱动程序使用这些资源时使用统一的接口，这样提高了程序的可移植性。 3.什么是input子系统 Input驱动程序是linux输入设备的驱动程序，分成游戏杆(joystick)、鼠标(mouse和mice)、事件设备(event)。其中事件驱动程序是目前通用的驱动程序，可支持键盘、鼠标、触摸屏等多种输入设备。 ---------------------------------------------------------------------- 本次实战的过程，platform _driver 与 platform_device 的probe 过程，并通过App 模拟鼠标的位置（一个random函数，模拟鼠标x ， y，并应该直接从鼠标传递，不过在项目实战前篇的开门篇不想增加过多的难度，所以仅作为模拟）传输到驱动中，并上报了input 核心层给应用层采集信息。 platform_device /* * platform_device.c * Author: chenpeng / #include #include #include #include #include #define GPIO_TO_PIN(bank, gpio) (((bank)32) + (gpio)) static struct resource mouse_analog_source[] = { [0] = { .flags = IORESOURCE_IRQ, .start = GPIO_TO_PIN(1, 27), .end = GPIO_TO_PIN(1, 27), }, }; static struct platform_device mouse_analog_dev = { .name = "irq_control", .id = -1, .num_resources = ARRAY_SIZE(mouse_analog_source), .resource = &mouse_analog_source, }; static int __init platform_device_init(void) { return platform_device_register(&mouse_analog_dev); } static void __exit platform_device_exit(void) { platform_device_unregister(&mouse_analog_dev); } module_init(platform_device_init); module_exit(platform_device_exit); MODULE_LICENSE("GPL"); 复制代码再看platform_driver ： /* * platform_driver.c * Author: chenpeng / #include #include #include #include #include #include #include #include #include #include #include #include #include //#include #define debug 1 #ifdef debug #define DEBUG(...) printk(KERN_INFO #__VA_ARGS__) //printk() #else #define DEBUG(...) do{} while(0) #endif static unsigned int gpio_num; static unsigned int devno; static struct cdev cdev; static struct class platform_class; int kbuf[20]; static int irq; static struct platform_device myinput_platform; static struct input_dev myinput; /* * / ----------------以下是我写input的函数，2017-02-22------------------------------------ ssize_t mouse_analog_write(struct file filp, const char __user ubuf, size_t count, unsigned long ppos) { int x = 0; int y = 0; sscanf(ubuf, "%d%d", &x,&y); printk("x = %d, y = %d n", x, y); input_report_key(myinput, REL_X, x); input_report_key(myinput, REL_Y, y); input_sync(myinput); return count; } static struct file_operations fops = { .owner = THIS_MODULE, .write = mouse_analog_write, }; static int mouse_analog_probe(struct platform_device pdev) { int ret = -1; DEBUG("mouse_analog_probe is runningn"); struct resource mouse_analog = platform_get_resource(pdev, IORESOURCE_IRQ, 0); gpio_num = mouse_analog->start; printk("--------------------------------------gpio_num = %d -------------------------------n", gpio_num); ret = alloc_chrdev_region(&devno, 0, 1, "mouse_analog_platform"); if (ret < 0){ printk("errorn"); ret = -1; goto fail1; } DEBUG("platform1 is running n"); cdev_init(&cdev, &fops); cdev.owner = THIS_MODULE; ret = cdev_add(&cdev, devno, 1); if (ret) { printk("errorn"); ret = -1; goto fail2; } platform_class = class_create(THIS_MODULE, "platform_mouse_analog_1"); if (IS_ERR(platform_class)) { printk("is error in platformclass n"); ret = -1; goto fail3; } DEBUG("platform is running n"); device_create(platform_class,NULL, devno, NULL, "platform_mouse_analog_2"); //gpio_request(gpio_num, "mouse_analog_light"); //gpio_direction_output(gpio_num, 0); irq = gpio_to_irq(gpio_num); if (irq < 0) { printk("-----------------------irq is fail--------------------- n"); } ret = request_irq(irq, irq_control_func, IRQF_TRIGGER_FALLING, "myirq", NULL); if (ret < 0) { printk("request_irq is fail n"); ret = -1; goto fail4; } myinput = input_allocate_device(); if (!myinput) { ret = -1; goto fail4; printk("request input is fail n"); } DEBUG("platform3 is running n"); //myinput->name = "my_input"; set_bit(EV_REL, myinput->evbit); set_bit(REL_X, myinput->relbit); set_bit(REL_Y, myinput->relbit); DEBUG("platform2 is running n"); ret = input_register_device(myinput); if (ret){ printk("input_register_device is fail n"); goto fail5; } DEBUG("platform5 is running n"); if (IS_ERR(myinput_platform)){ printk("platform_device_register_simple is fail n"); ret = -1; goto fail5; } DEBUG("platform6 is running n"); printk("probe func is running ending n"); return 0; fail5: input_free_device(myinput); fail4: free_irq(irq, NULL); fail3: class_destroy(platform_class); fail2: cdev_del(&cdev); fail1: unregister_chrdev_region(devno, 1); return ret; } static int mouse_analog_remove(struct platform_device pdev) { device_destroy(platform_class, devno); class_destroy(platform_class); input_unregister_device(myinput); // platform_device_unregister(myinput_platform); cdev_del(&cdev); printk("num = %d n", irq); free_irq(irq, NULL); unregister_chrdev_region(devno, 1); return 0; } static struct platform_driver mouse_analog_drv = { .driver ={ .name = "irq_control", .owner = THIS_MODULE, }, .probe = mouse_analog_probe, .remove = mouse_analog_remove, }; static int __init platform_driver_init(void) { return platform_driver_register(&mouse_analog_drv); } static void __exit platform_driver_exit(void) { platform_driver_unregister(&mouse_analog_drv); } module_init(platform_driver_init); module_exit(platform_driver_exit); MODULE_LICENSE("GPL"); 复制代码* 最后看app函数： /* * app.c * * Author: chenpeng / #include #include #include #include #include #define FILE_NAME "/dev/mouse_analog2" int main(void) { int fd, x ,y; char buf[20]; fd = open(FILE_NAME, O_RDWR); if (fd < 0) { printf("open is error n"); return -1; } / while(1){ x = random()%20; y = random()%20; sprintf(buf, "%d %d", x, y); printf("buf = %s n", buf); write(fd, buf, 20); //fsync(fd); sleep(1); } / printf("~~~~~~~~~~~~~success~~~~~~~~~~~~n"); return 0; } 复制代码* 这就是全部的代码，下面一节将写关于USB的驱动，与小米手机连接 0
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