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国家电网交流建设分公司网站,网站运营规划,建立网站的好处,美团网站制作的特色目录 一、ID匹配之框架代码 二、ID匹配之led驱动​​​​​​​ 三、设备树匹配 四、设备树匹配之led驱动 五、一个编写驱动用的宏 一、ID匹配之框架代码 id匹配#xff08;可想象成八字匹配#xff09;#xff1a;一个驱动可以对应多个设备 ------优先级次低 注意事项…目录 一、ID匹配之框架代码 二、ID匹配之led驱动​​​​​​​ 三、设备树匹配 四、设备树匹配之led驱动 五、一个编写驱动用的宏 一、ID匹配之框架代码 id匹配可想象成八字匹配一个驱动可以对应多个设备 ------优先级次低 注意事项 1.  device模块中id的name成员必须与struct platform_device中的name成员内容一致因此device模块中struct platform_device中的name成员必须指定 2.  driver模块中struct platform_driver成员driver的name成员必须指定但与device模块中name可以不相同 c/*platform device框架*/#include linux/module.h#include linux/kernel.h#include linux/init.h#include linux/platform_device.h//定义资源数组static void device_release(struct device *dev){printk(platform: device release\n);}struct platform_device_id test_id {.name test_device,};struct platform_device test_device {.name test_device,//必须初始化.dev.release device_release,.id_entry test_id,};static int __init platform_device_init(void){platform_device_register(test_device);return 0;}static void __exit platform_device_exit(void){platform_device_unregister(test_device);}module_init(platform_device_init);module_exit(platform_device_exit);MODULE_LICENSE(Dual BSD/GPL); c/*platform driver框架*/#include linux/module.h#include linux/kernel.h#include linux/init.h#include linux/platform_device.hstatic int driver_probe(struct platform_device *dev){printk(platform: match ok!\n);return 0;}static int driver_remove(struct platform_device *dev){printk(platform: driver remove\n);return 0;}struct platform_device_id testdrv_ids[] {[0] {.name test_device},[1] {.name abcxyz},[2] {}, //means ending};struct platform_driver test_driver {.probe driver_probe,.remove driver_remove,.driver {.name xxxxx, //必须初始化},.id_table testdrv_ids,};static int __init platform_driver_init(void){platform_driver_register(test_driver);return 0;}static void __exit platform_driver_exit(void){platform_driver_unregister(test_driver);}module_init(platform_driver_init);module_exit(platform_driver_exit);MODULE_LICENSE(Dual BSD/GPL); 用到结构体数组一般不指定大小初始化时最后加{}表示数组结束 设备中增加资源驱动中访问资源 #include linux/module.h #include linux/kernel.h #include linux/platform_device.hstatic void hello_device_release(struct device *dev) {printk(platform:device release\n); }struct resource hello_dev_res [] {[0] {.start 0x1000, .end0x1003, .namereg1, .flags IORESOURCE_MEM},[1] {.start 0x2000, .end0x2003, .namereg2, .flags IORESOURCE_MEM},[2] {.start 10, .end10, .nameirq1, .flags IORESOURCE_IRQ},[3] {.start 0x3000, .end0x3003, .namereg3, .flags IORESOURCE_MEM},[4] {.start 100, .end100, .nameirq2, .flags IORESOURCE_IRQ},[5] {.start 62, .end62, .nameirq3, .flags IORESOURCE_IRQ}, };struct platform_device_id hello_id {.name hello, };struct platform_device hello_device {.name hello,.dev.release hello_device_release,.resource hello_dev_res,.num_resources ARRAY_SIZE(hello_dev_res),.id_entry hello_id, };int __init hello_device_init(void) {platform_device_register(hello_device);return 0; } void __exit hello_device_exit(void) {platform_device_unregister(hello_device); } MODULE_LICENSE(GPL); module_init(hello_device_init); module_exit(hello_device_exit);#include linux/module.h #include linux/kernel.h #include linux/platform_device.hint hello_driver_probe(struct platform_device *p_pltdev) {struct resource *pres NULL;printk(hellio_driver_probe is called\n);pres platform_get_resource(p_pltdev,IORESOURCE_MEM,2);printk(res.start 0x%x\n,(unsigned int)pres-start);pres platform_get_resource(p_pltdev,IORESOURCE_IRQ,1);printk(res.start %d\n,(int)pres-start);return 0; }int hello_driver_remove(struct platform_device *p_pltdev) {printk(hellio_driver_remove is called\n);return 0; }struct platform_device_id hellodrv_ids[] {[0] {.name hello},[1] {.name xyz},[2] {} };struct platform_driver hello_driver {.driver.name abc,.probe hello_driver_probe,.remove hello_driver_remove,.id_table hellodrv_ids, };int __init hello_driver_init(void) {platform_driver_register(hello_driver);return 0; } void __exit hello_driver_exit(void) {platform_driver_unregister(hello_driver); } MODULE_LICENSE(GPL); module_init(hello_driver_init); module_exit(hello_driver_exit);二、ID匹配之led驱动 #include linux/module.h #include linux/kernel.h #include linux/platform_device.h#define GPX1CON 0x11000C20 #define GPX1DAT 0x11000C24#define GPX2CON 0x11000C40 #define GPX2DAT 0x11000C44#define GPF3CON 0x114001E0 #define GPF3DAT 0x114001E4 void fs4412leds_dev_release(struct device *pdev) {printk(fs4412leds_dev_release is called\n); }struct resource fs4412leds_dev_res [] {[0] {.start GPX1CON,.endGPX1CON 3,.nameGPX1CON,.flags IORESOURCE_MEM},[1] {.start GPX1DAT,.endGPX1DAT 3,.nameGPX1DAT,.flags IORESOURCE_MEM},[2] {.start GPX2CON,.endGPX2CON 3,.nameGPX2CON,.flags IORESOURCE_MEM},[3] {.start GPX2DAT,.endGPX2DAT 3,.nameGPX2DAT,.flags IORESOURCE_MEM},[4] {.start GPF3CON,.endGPF3CON 3,.nameGPF3CON,.flags IORESOURCE_MEM},[5] {.start GPF3DAT,.endGPF3DAT 3,.nameGPF3DAT,.flags IORESOURCE_MEM}, };struct platform_device_id led_id {.name fs4412leds, };struct platform_device fs4412leds_device {.name fs4412leds,.dev.release fs4412leds_dev_release,.resource fs4412leds_dev_res,.num_resources ARRAY_SIZE(fs4412leds_dev_res),.id_entry led_id, };int __init fs4412leds_device_init(void) {platform_device_register(fs4412leds_device);return 0; }void __exit fs4412leds_device_exit(void) {platform_device_unregister(fs4412leds_device); }MODULE_LICENSE(GPL); module_init(fs4412leds_device_init); module_exit(fs4412leds_device_exit);#include linux/module.h #include linux/kernel.h #include linux/platform_device.h #include linux/fs.h #include linux/cdev.h #include linux/wait.h #include linux/sched.h #include linux/poll.h #include linux/slab.h #include linux/mm.h #include linux/io.h #include asm/uaccess.h #include asm/atomic.h#include leddrv.hint major 11; int minor 0; int myled_num 1;struct myled_dev {struct cdev mydev;volatile unsigned long *pled2_con;volatile unsigned long *pled2_dat;volatile unsigned long *pled3_con;volatile unsigned long *pled3_dat;volatile unsigned long *pled4_con;volatile unsigned long *pled4_dat;volatile unsigned long *pled5_con;volatile unsigned long *pled5_dat; };struct myled_dev *pgmydev NULL;int myled_open(struct inode *pnode,struct file *pfile) {pfile-private_data (void *) (container_of(pnode-i_cdev,struct myled_dev,mydev));return 0; }int myled_close(struct inode *pnode,struct file *pfile) {return 0; }void led_on(struct myled_dev *pmydev,int ledno) {switch(ledno){case 2:writel(readl(pmydev-pled2_dat) | (0x1 7),pmydev-pled2_dat);break;case 3:writel(readl(pmydev-pled3_dat) | (0x1),pmydev-pled3_dat);break;case 4:writel(readl(pmydev-pled4_dat) | (0x1 4),pmydev-pled4_dat);break;case 5:writel(readl(pmydev-pled5_dat) | (0x1 5),pmydev-pled5_dat);break;} }void led_off(struct myled_dev *pmydev,int ledno) {switch(ledno){case 2:writel(readl(pmydev-pled2_dat) (~(0x1 7)),pmydev-pled2_dat);break;case 3:writel(readl(pmydev-pled3_dat) (~(0x1)),pmydev-pled3_dat);break;case 4:writel(readl(pmydev-pled4_dat) (~(0x1 4)),pmydev-pled4_dat);break;case 5:writel(readl(pmydev-pled5_dat) (~(0x1 5)),pmydev-pled5_dat);break;} }long myled_ioctl(struct file *pfile,unsigned int cmd,unsigned long arg) {struct myled_dev *pmydev (struct myled_dev *)pfile-private_data;if(arg 2 || arg 5){return -1;}switch(cmd){case MY_LED_ON:led_on(pmydev,arg);break;case MY_LED_OFF:led_off(pmydev,arg);break;default:return -1;}return 0; }struct file_operations myops {.owner THIS_MODULE,.open myled_open,.release myled_close,.unlocked_ioctl myled_ioctl, };void ioremap_ledreg(struct myled_dev *pmydev,struct platform_device *p_pltdev) {struct resource *pres NULL;pres platform_get_resource(p_pltdev,IORESOURCE_MEM,2);pmydev-pled2_con ioremap(pres-start,4);pres platform_get_resource(p_pltdev,IORESOURCE_MEM,3);pmydev-pled2_dat ioremap(pres-start,4);pres platform_get_resource(p_pltdev,IORESOURCE_MEM,0);pmydev-pled3_con ioremap(pres-start,4);pres platform_get_resource(p_pltdev,IORESOURCE_MEM,1);pmydev-pled3_dat ioremap(pres-start,4);pres platform_get_resource(p_pltdev,IORESOURCE_MEM,4);pmydev-pled4_con ioremap(pres-start,4);pres platform_get_resource(p_pltdev,IORESOURCE_MEM,5);pmydev-pled4_dat ioremap(pres-start,4);pmydev-pled5_con pmydev-pled4_con;pmydev-pled5_dat pmydev-pled4_dat; }void set_output_ledconreg(struct myled_dev *pmydev) {writel((readl(pmydev-pled2_con) (~(0xF 28))) | (0x1 28),pmydev-pled2_con);writel((readl(pmydev-pled3_con) (~(0xF))) | (0x1),pmydev-pled3_con);writel((readl(pmydev-pled4_con) (~(0xF 16))) | (0x1 16),pmydev-pled4_con);writel((readl(pmydev-pled5_con) (~(0xF 20))) | (0x1 20),pmydev-pled5_con);writel(readl(pmydev-pled2_dat) (~(0x1 7)),pmydev-pled2_dat);writel(readl(pmydev-pled3_dat) (~(0x1)),pmydev-pled3_dat);writel(readl(pmydev-pled4_dat) (~(0x1 4)),pmydev-pled4_dat);writel(readl(pmydev-pled5_dat) (~(0x1 5)),pmydev-pled5_dat); }void iounmap_ledreg(struct myled_dev *pmydev) {iounmap(pmydev-pled2_con);pmydev-pled2_con NULL;iounmap(pmydev-pled2_dat);pmydev-pled2_dat NULL;iounmap(pmydev-pled3_con);pmydev-pled3_con NULL;iounmap(pmydev-pled3_dat);pmydev-pled3_dat NULL;iounmap(pmydev-pled4_con);pmydev-pled4_con NULL;iounmap(pmydev-pled4_dat);pmydev-pled4_dat NULL;pmydev-pled5_con NULL;pmydev-pled5_dat NULL; }int fs4412leds_driver_probe(struct platform_device *p_pltdev) {int ret 0;dev_t devno MKDEV(major,minor);/*申请设备号*/ret register_chrdev_region(devno,myled_num,myled);if(ret){ret alloc_chrdev_region(devno,minor,myled_num,myled);if(ret){printk(get devno failed\n);return -1;}major MAJOR(devno);//容易遗漏注意}pgmydev (struct myled_dev *)kmalloc(sizeof(struct myled_dev),GFP_KERNEL);if(NULL pgmydev){unregister_chrdev_region(devno,myled_num);printk(kmalloc failed\n);return -1;}memset(pgmydev,0,sizeof(struct myled_dev));/*给struct cdev对象指定操作函数集*/ cdev_init(pgmydev-mydev,myops);/*将struct cdev对象添加到内核对应的数据结构里*/pgmydev-mydev.owner THIS_MODULE;cdev_add(pgmydev-mydev,devno,myled_num);/*ioremap*/ioremap_ledreg(pgmydev,p_pltdev);/*con-register set output*/set_output_ledconreg(pgmydev);return 0; }int fs4412leds_driver_remove(struct platform_device *p_pltdev) {dev_t devno MKDEV(major,minor);/*iounmap*/iounmap_ledreg(pgmydev);cdev_del(pgmydev-mydev);unregister_chrdev_region(devno,myled_num);kfree(pgmydev);pgmydev NULL;return 0; }struct platform_device_id leddrv_ids[] {[0] {.name fs4412leds},[1] {.name xyz},[2] {} };struct platform_driver fs4412leds_driver {.driver.name leds,.probe fs4412leds_driver_probe,.remove fs4412leds_driver_remove,.id_table leddrv_ids, };int __init fs4412leds_driver_init(void) {platform_driver_register(fs4412leds_driver);return 0; }void __exit fs4412leds_driver_exit(void) {platform_driver_unregister(fs4412leds_driver); }MODULE_LICENSE(GPL);module_init(fs4412leds_driver_init); module_exit(fs4412leds_driver_exit);#ifndef LED_DRIVER_H #define LED_DRIVER_H#define LED_DEV_MAGIC g#define MY_LED_OFF _IO(LED_DEV_MAGIC,0) #define MY_LED_ON _IO(LED_DEV_MAGIC,1)#endif#include sys/types.h #include sys/stat.h #include fcntl.h #include sys/ioctl.h #include unistd.h#include stdio.h#include leddrv.hint main(int argc,char *argv[]) {int fd -1;int onoff 0;int no 0;if(argc 4){printf(The argument is too few\n);return 1;}sscanf(argv[2],%d,onoff);sscanf(argv[3],%d,no);if(no 2 || no 5){printf(len-no is invalid\n);return 2;}fd open(argv[1],O_RDONLY);if(fd 0){printf(open %s failed\n,argv[1]);return 3;}if(onoff){ioctl(fd,MY_LED_ON,no);}else{ioctl(fd,MY_LED_OFF,no);}close(fd);fd -1;return 0; }三、设备树匹配 设备树匹配内核启动时根据设备树自动产生的设备 ------ 优先级最高 注意事项 1. 无需编写device模块只需编写driver模块 2. 使用compatible属性进行匹配注意设备树中compatible属性值不要包含空白字符 3. id_table可不设置但struct platform_driver成员driver的name成员必须设置 c /*platform driver框架*/ #include linux/module.h #include linux/kernel.h #include linux/init.h #include linux/platform_device.hstatic int driver_probe(struct platform_device *dev) {printk(platform: match ok!\n);return 0; }static int driver_remove(struct platform_device *dev) {printk(platform: driver remove\n);return 0; }struct platform_device_id testdrv_ids[] {[0] {.name test_device},[1] {.name abcxyz},[2] {}, //means ending };struct of_device_id test_of_ids[] {[0] {.compatible xyz,abc},[1] {.compatible qwe,opq},[2] {}, };struct platform_driver test_driver {.probe driver_probe,.remove driver_remove,.driver {.name xxxxx, //必须初始化.of_match_table test_of_ids,}, };static int __init platform_driver_init(void) {platform_driver_register(test_driver);return 0; }static void __exit platform_driver_exit(void) {platform_driver_unregister(test_driver); }module_init(platform_driver_init); module_exit(platform_driver_exit); MODULE_LICENSE(Dual BSD/GPL);四、设备树匹配之led驱动 #include linux/module.h #include linux/kernel.h #include linux/platform_device.h #include linux/fs.h #include linux/gpio.h #include linux/of_gpio.h #include linux/cdev.h #include linux/wait.h #include linux/sched.h #include linux/poll.h #include linux/slab.h #include linux/mm.h #include linux/io.h #include asm/uaccess.h #include asm/atomic.h#include leddrv.hint major 11; int minor 0; int myled_num 1;struct myled_dev {struct cdev mydev;unsigned int led2gpio;unsigned int led3gpio;unsigned int led4gpio;unsigned int led5gpio; };struct myled_dev *pgmydev NULL;int myled_open(struct inode *pnode,struct file *pfile) {pfile-private_data (void *) (container_of(pnode-i_cdev,struct myled_dev,mydev));return 0; }int myled_close(struct inode *pnode,struct file *pfile) {return 0; }void led_on(struct myled_dev *pmydev,int ledno) {switch(ledno){case 2:gpio_set_value(pmydev-led2gpio,1);break;case 3:gpio_set_value(pmydev-led3gpio,1);break;case 4:gpio_set_value(pmydev-led4gpio,1);break;case 5:gpio_set_value(pmydev-led5gpio,1);break;} }void led_off(struct myled_dev *pmydev,int ledno) {switch(ledno){case 2:gpio_set_value(pmydev-led2gpio,0);break;case 3:gpio_set_value(pmydev-led3gpio,0);break;case 4:gpio_set_value(pmydev-led4gpio,0);break;case 5:gpio_set_value(pmydev-led5gpio,0);break;} }long myled_ioctl(struct file *pfile,unsigned int cmd,unsigned long arg) {struct myled_dev *pmydev (struct myled_dev *)pfile-private_data;if(arg 2 || arg 5){return -1;}switch(cmd){case MY_LED_ON:led_on(pmydev,arg);break;case MY_LED_OFF:led_off(pmydev,arg);break;default:return -1;}return 0; }struct file_operations myops {.owner THIS_MODULE,.open myled_open,.release myled_close,.unlocked_ioctl myled_ioctl, };void request_leds_gpio(struct myled_dev *pmydev,struct device_node *pnode) {pmydev-led2gpio of_get_named_gpio(pnode,led2-gpio,0);gpio_request(pmydev-led2gpio,led2);pmydev-led3gpio of_get_named_gpio(pnode,led3-gpio,0);gpio_request(pmydev-led3gpio,led3);pmydev-led4gpio of_get_named_gpio(pnode,led4-gpio,0);gpio_request(pmydev-led4gpio,led4);pmydev-led5gpio of_get_named_gpio(pnode,led5-gpio,0);gpio_request(pmydev-led5gpio,led5); }void set_leds_gpio_output(struct myled_dev *pmydev) {gpio_direction_output(pmydev-led2gpio,0);gpio_direction_output(pmydev-led3gpio,0);gpio_direction_output(pmydev-led4gpio,0);gpio_direction_output(pmydev-led5gpio,0); }void free_leds_gpio(struct myled_dev *pmydev) {gpio_free(pmydev-led2gpio);gpio_free(pmydev-led3gpio);gpio_free(pmydev-led4gpio);gpio_free(pmydev-led5gpio); }int myled_probe(struct platform_device *p_pltdev) {int ret 0;dev_t devno MKDEV(major,minor);struct device_node *pnode NULL;/*申请设备号*/ret register_chrdev_region(devno,myled_num,myled);if(ret){ret alloc_chrdev_region(devno,minor,myled_num,myled);if(ret){printk(get devno failed\n);return -1;}major MAJOR(devno);//容易遗漏注意}pgmydev (struct myled_dev *)kmalloc(sizeof(struct myled_dev),GFP_KERNEL);if(NULL pgmydev){unregister_chrdev_region(devno,myled_num);printk(kmalloc failed\n);return -1;}memset(pgmydev,0,sizeof(struct myled_dev));/*给struct cdev对象指定操作函数集*/ cdev_init(pgmydev-mydev,myops);/*将struct cdev对象添加到内核对应的数据结构里*/pgmydev-mydev.owner THIS_MODULE;cdev_add(pgmydev-mydev,devno,myled_num);pnode p_pltdev-dev.of_node;/*ioremap*/request_leds_gpio(pgmydev,pnode);/*con-register set output*/set_leds_gpio_output(pgmydev);return 0; }int myled_remove(struct platform_device *p_pltdev) {dev_t devno MKDEV(major,minor);/*iounmap*/free_leds_gpio(pgmydev);cdev_del(pgmydev-mydev);unregister_chrdev_region(devno,myled_num);kfree(pgmydev);pgmydev NULL;return 0; }struct of_device_id myleddrv_of_ids[] {[0] {.compatible fs4412,led2-5},[1] {.compatible origen4412,led6-9},[2] {}, };struct platform_driver myled_driver {.driver {.name fs4412leds,.of_match_table myleddrv_of_ids,},.probe myled_probe,.remove myled_remove, };int __init myled_init(void) {platform_driver_register(myled_driver);return 0; }void __exit myled_exit(void) {platform_driver_unregister(myled_driver); }MODULE_LICENSE(GPL);module_init(myled_init); module_exit(myled_exit);五、一个编写驱动用的宏 cstruct platform_driver xxx {  ...};module_platform_driver(xxx);//最终展开后就是如下形式static int __init xxx_init(void){return platform_driver_register(xxx);}module_init(xxx_init);static void __exit xxx_init(void){return platform_driver_unregister(xxx);}module_exit(xxx_exit)
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