diff --git a/IMX6ULL/doc_pic/09_UART/06_TTY驱动程序框架深入分析.tif b/IMX6ULL/doc_pic/09_UART/06_TTY驱动程序框架深入分析.tif new file mode 100644 index 0000000..6022ee4 Binary files /dev/null and b/IMX6ULL/doc_pic/09_UART/06_TTY驱动程序框架深入分析.tif differ diff --git a/IMX6ULL/doc_pic/09_UART/07_字符设备驱动程序的另一种注册方法.md b/IMX6ULL/doc_pic/09_UART/07_字符设备驱动程序的另一种注册方法.md new file mode 100644 index 0000000..c458562 --- /dev/null +++ b/IMX6ULL/doc_pic/09_UART/07_字符设备驱动程序的另一种注册方法.md @@ -0,0 +1,115 @@ +## 字符设备驱动程序的另一种注册方法 + +参考资料 + +* 参考代码：`drivers\char\pc8736x_gpio.c` + +* 本节课程源码在GIT仓库里 + + ```shell + 驱动大全: + doc_and_source_for_drivers\IMX6ULL\source\09_UART\ + 03_char_dev_driver\ + 01b_hello_drv + doc_and_source_for_drivers\STM32MP157\source\A7\09_UART\ + 03_char_dev_driver\ + 01b_hello_drv + + 快速入门: + 01_all_series_quickstart\05_嵌入式Linux驱动开发基础知识\source\ + 01b_hello_drv + ``` + + + +### 1. 字符设备驱动程序框架 + +![image-20210721184155242](pic/09_UART/22_chr_dev_driver.png) + + + +编写驱动程序的套路： +* 确定主设备号，也可以让内核分配 +* 定义自己的file_operations结构体 +* 实现对应的drv_open/drv_read/drv_write等函数，填入file_operations结构体 +* 把file_operations结构体告诉内核：register_chrdev +* 谁来注册驱动程序啊？得有一个入口函数：安装驱动程序时，就会去调用这个入口函数 +* 有入口函数就应该有出口函数：卸载驱动程序时，出口函数调用unregister_chrdev +* 其他完善：提供设备信息，自动创建设备节点：class_create, device_create + + + + + +### 2. 新的注册方法 + +参考代码：`drivers\char\pc8736x_gpio.c` + +* 注册字符设备区域 + * 有主设备号：register_chrdev_region + * 无主设备号：alloc_chrdev_region +* 分配/设置/注册cdev + * cdev_alloc + * cdev_init + * cdev_add + + + + + +### 3. 上机实验 + +#### 3.1 IMX6ULL + +先设置工具链： + +```shell +export ARCH=arm +export CROSS_COMPILE=arm-buildroot-linux-gnueabihf- +export PATH=$PATH:/home/book/100ask_imx6ull-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/bin +``` + + + +编译、执行程序: + +```shell +Ubuntu: +cd 01_hello_drv\ +make + +开发板: +insmod hello_drv.ko +./hello_drv_test -w abcd +./hello_drv_test -r +``` + + + +#### 3.2 STM32MP157 + +先设置工具链： + +```shell +export ARCH=arm +export CROSS_COMPILE=arm-buildroot-linux-gnueabihf- +export PATH=$PATH:/home/book/100ask_stm32mp157_pro-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/bin +``` + + + +编译、执行程序: + +```shell +Ubuntu: +cd 01_hello_drv\ +make + +开发板: +insmod hello_drv.ko +./hello_drv_test -w abcd +./hello_drv_test -r +``` + + + diff --git a/IMX6ULL/doc_pic/09_UART/pic/09_UART/22_chr_dev_driver.png b/IMX6ULL/doc_pic/09_UART/pic/09_UART/22_chr_dev_driver.png new file mode 100644 index 0000000..108d53a Binary files /dev/null and b/IMX6ULL/doc_pic/09_UART/pic/09_UART/22_chr_dev_driver.png differ diff --git a/IMX6ULL/source/09_UART/03_char_dev_driver/01_hello_drv/Makefile b/IMX6ULL/source/09_UART/03_char_dev_driver/01_hello_drv/Makefile new file mode 100644 index 0000000..05ca165 --- /dev/null +++ b/IMX6ULL/source/09_UART/03_char_dev_driver/01_hello_drv/Makefile @@ -0,0 +1,21 @@ + +# 1. 使用不同的开发板内核时, 一定要修改KERN_DIR +# 2. KERN_DIR中的内核要事先配置、编译, 为了能编译内核, 要先设置下列环境变量: +# 2.1 ARCH, 比如: export ARCH=arm64 +# 2.2 CROSS_COMPILE, 比如: export CROSS_COMPILE=aarch64-linux-gnu- +# 2.3 PATH, 比如: export PATH=$PATH:/home/book/100ask_roc-rk3399-pc/ToolChain-6.3.1/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin +# 注意: 不同的开发板不同的编译器上述3个环境变量不一定相同, +# 请参考各开发板的高级用户使用手册 + +KERN_DIR = /home/book/100ask_imx6ull-sdk/Linux-4.9.88 + +all: + make -C $(KERN_DIR) M=`pwd` modules + $(CROSS_COMPILE)gcc -o hello_drv_test hello_drv_test.c + +clean: + make -C $(KERN_DIR) M=`pwd` modules clean + rm -rf modules.order + rm -f hello_drv_test + +obj-m += hello_drv.o diff --git a/IMX6ULL/source/09_UART/03_char_dev_driver/01_hello_drv/hello_drv.c b/IMX6ULL/source/09_UART/03_char_dev_driver/01_hello_drv/hello_drv.c new file mode 100644 index 0000000..c03f40e --- /dev/null +++ b/IMX6ULL/source/09_UART/03_char_dev_driver/01_hello_drv/hello_drv.c @@ -0,0 +1,104 @@ +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* 1. 确定主设备号 */ +static int major = 0; +static char kernel_buf[1024]; +static struct class *hello_class; + + +#define MIN(a, b) (a < b ? a : b) + +/* 3. 实现对应的open/read/write等函数，填入file_operations结构体 */ +static ssize_t hello_drv_read (struct file *file, char __user *buf, size_t size, loff_t *offset) +{ + int err; + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + err = copy_to_user(buf, kernel_buf, MIN(1024, size)); + return MIN(1024, size); +} + +static ssize_t hello_drv_write (struct file *file, const char __user *buf, size_t size, loff_t *offset) +{ + int err; + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + err = copy_from_user(kernel_buf, buf, MIN(1024, size)); + return MIN(1024, size); +} + +static int hello_drv_open (struct inode *node, struct file *file) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + return 0; +} + +static int hello_drv_close (struct inode *node, struct file *file) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + return 0; +} + +/* 2. 定义自己的file_operations结构体 */ +static struct file_operations hello_drv = { + .owner = THIS_MODULE, + .open = hello_drv_open, + .read = hello_drv_read, + .write = hello_drv_write, + .release = hello_drv_close, +}; + +/* 4. 把file_operations结构体告诉内核：注册驱动程序 */ +/* 5. 谁来注册驱动程序啊？得有一个入口函数：安装驱动程序时，就会去调用这个入口函数 */ +static int __init hello_init(void) +{ + int err; + + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + major = register_chrdev(0, "hello", &hello_drv); /* /dev/hello */ + + + hello_class = class_create(THIS_MODULE, "hello_class"); + err = PTR_ERR(hello_class); + if (IS_ERR(hello_class)) { + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + unregister_chrdev(major, "hello"); + return -1; + } + + device_create(hello_class, NULL, MKDEV(major, 0), NULL, "hello"); /* /dev/hello */ + + return 0; +} + +/* 6. 有入口函数就应该有出口函数：卸载驱动程序时，就会去调用这个出口函数 */ +static void __exit hello_exit(void) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + device_destroy(hello_class, MKDEV(major, 0)); + class_destroy(hello_class); + unregister_chrdev(major, "hello"); +} + + +/* 7. 其他完善：提供设备信息，自动创建设备节点 */ + +module_init(hello_init); +module_exit(hello_exit); + +MODULE_LICENSE("GPL"); + + diff --git a/IMX6ULL/source/09_UART/03_char_dev_driver/01_hello_drv/hello_drv_test.c b/IMX6ULL/source/09_UART/03_char_dev_driver/01_hello_drv/hello_drv_test.c new file mode 100644 index 0000000..28b2fba --- /dev/null +++ b/IMX6ULL/source/09_UART/03_char_dev_driver/01_hello_drv/hello_drv_test.c @@ -0,0 +1,54 @@ + +#include +#include +#include +#include +#include +#include + +/* + * ./hello_drv_test -w abc + * ./hello_drv_test -r + */ +int main(int argc, char **argv) +{ + int fd; + char buf[1024]; + int len; + + /* 1. 判断参数 */ + if (argc < 2) + { + printf("Usage: %s -w \n", argv[0]); + printf(" %s -r\n", argv[0]); + return -1; + } + + /* 2. 打开文件 */ + fd = open("/dev/hello", O_RDWR); + if (fd == -1) + { + printf("can not open file /dev/hello\n"); + return -1; + } + + /* 3. 写文件或读文件 */ + if ((0 == strcmp(argv[1], "-w")) && (argc == 3)) + { + len = strlen(argv[2]) + 1; + len = len < 1024 ? len : 1024; + write(fd, argv[2], len); + } + else + { + len = read(fd, buf, 1024); + buf[1023] = '\0'; + printf("APP read : %s\n", buf); + } + + close(fd); + + return 0; +} + + diff --git a/IMX6ULL/source/09_UART/03_char_dev_driver/01b_hello_drv/Makefile b/IMX6ULL/source/09_UART/03_char_dev_driver/01b_hello_drv/Makefile new file mode 100644 index 0000000..05ca165 --- /dev/null +++ b/IMX6ULL/source/09_UART/03_char_dev_driver/01b_hello_drv/Makefile @@ -0,0 +1,21 @@ + +# 1. 使用不同的开发板内核时, 一定要修改KERN_DIR +# 2. KERN_DIR中的内核要事先配置、编译, 为了能编译内核, 要先设置下列环境变量: +# 2.1 ARCH, 比如: export ARCH=arm64 +# 2.2 CROSS_COMPILE, 比如: export CROSS_COMPILE=aarch64-linux-gnu- +# 2.3 PATH, 比如: export PATH=$PATH:/home/book/100ask_roc-rk3399-pc/ToolChain-6.3.1/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin +# 注意: 不同的开发板不同的编译器上述3个环境变量不一定相同, +# 请参考各开发板的高级用户使用手册 + +KERN_DIR = /home/book/100ask_imx6ull-sdk/Linux-4.9.88 + +all: + make -C $(KERN_DIR) M=`pwd` modules + $(CROSS_COMPILE)gcc -o hello_drv_test hello_drv_test.c + +clean: + make -C $(KERN_DIR) M=`pwd` modules clean + rm -rf modules.order + rm -f hello_drv_test + +obj-m += hello_drv.o diff --git a/IMX6ULL/source/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv.c b/IMX6ULL/source/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv.c new file mode 100644 index 0000000..a9543ff --- /dev/null +++ b/IMX6ULL/source/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv.c @@ -0,0 +1,114 @@ +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* 1. 确定主设备号 */ +static int major = 0; +static struct cdev hello_cdev; + +static char kernel_buf[1024]; +static struct class *hello_class; + + +#define MIN(a, b) (a < b ? a : b) + +/* 3. 实现对应的open/read/write等函数，填入file_operations结构体 */ +static ssize_t hello_drv_read (struct file *file, char __user *buf, size_t size, loff_t *offset) +{ + int err; + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + err = copy_to_user(buf, kernel_buf, MIN(1024, size)); + return MIN(1024, size); +} + +static ssize_t hello_drv_write (struct file *file, const char __user *buf, size_t size, loff_t *offset) +{ + int err; + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + err = copy_from_user(kernel_buf, buf, MIN(1024, size)); + return MIN(1024, size); +} + +static int hello_drv_open (struct inode *node, struct file *file) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + return 0; +} + +static int hello_drv_close (struct inode *node, struct file *file) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + return 0; +} + +/* 2. 定义自己的file_operations结构体 */ +static struct file_operations hello_drv = { + .owner = THIS_MODULE, + .open = hello_drv_open, + .read = hello_drv_read, + .write = hello_drv_write, + .release = hello_drv_close, +}; + +/* 4. 把file_operations结构体告诉内核：注册驱动程序 */ +/* 5. 谁来注册驱动程序啊？得有一个入口函数：安装驱动程序时，就会去调用这个入口函数 */ +static int __init hello_init(void) +{ + int err; + int rc; + dev_t devid; + + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + //major = register_chrdev(0, "hello", &hello_drv); /* /dev/hello */ + rc = alloc_chrdev_region(&devid, 0, 1, "hello"); + major = MAJOR(devid); + cdev_init(&hello_cdev, &hello_drv); + cdev_add(&hello_cdev, devid, 1); + + hello_class = class_create(THIS_MODULE, "hello_class"); + err = PTR_ERR(hello_class); + if (IS_ERR(hello_class)) { + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + unregister_chrdev(major, "hello"); + return -1; + } + + device_create(hello_class, NULL, MKDEV(major, 0), NULL, "hello"); /* /dev/hello */ + + return 0; +} + +/* 6. 有入口函数就应该有出口函数：卸载驱动程序时，就会去调用这个出口函数 */ +static void __exit hello_exit(void) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + device_destroy(hello_class, MKDEV(major, 0)); + class_destroy(hello_class); + + //unregister_chrdev(major, "hello"); + cdev_del(&hello_cdev); + unregister_chrdev_region(MKDEV(major,0), 1); +} + + +/* 7. 其他完善：提供设备信息，自动创建设备节点 */ + +module_init(hello_init); +module_exit(hello_exit); + +MODULE_LICENSE("GPL"); + + diff --git a/IMX6ULL/source/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv_test.c b/IMX6ULL/source/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv_test.c new file mode 100644 index 0000000..28b2fba --- /dev/null +++ b/IMX6ULL/source/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv_test.c @@ -0,0 +1,54 @@ + +#include +#include +#include +#include +#include +#include + +/* + * ./hello_drv_test -w abc + * ./hello_drv_test -r + */ +int main(int argc, char **argv) +{ + int fd; + char buf[1024]; + int len; + + /* 1. 判断参数 */ + if (argc < 2) + { + printf("Usage: %s -w \n", argv[0]); + printf(" %s -r\n", argv[0]); + return -1; + } + + /* 2. 打开文件 */ + fd = open("/dev/hello", O_RDWR); + if (fd == -1) + { + printf("can not open file /dev/hello\n"); + return -1; + } + + /* 3. 写文件或读文件 */ + if ((0 == strcmp(argv[1], "-w")) && (argc == 3)) + { + len = strlen(argv[2]) + 1; + len = len < 1024 ? len : 1024; + write(fd, argv[2], len); + } + else + { + len = read(fd, buf, 1024); + buf[1023] = '\0'; + printf("APP read : %s\n", buf); + } + + close(fd); + + return 0; +} + + diff --git a/README.md b/README.md index 0f9eea8..a757f5c 100644 --- a/README.md +++ b/README.md @@ -334,6 +334,12 @@ git clone https://e.coding.net/weidongshan/linux/doc_and_source_for_drivers.git 06_Linux串口应用编程_GPS ``` +* 2021.07.21 发布"UART子系统" + + ```shell + 07_字符设备驱动程序的另一种注册方法 + ``` + ## 6. 联系方式 * 官网：http://www.100ask.net diff --git a/STM32MP157/doc_pic/09_UART/07_字符设备驱动程序的另一种注册方法.md b/STM32MP157/doc_pic/09_UART/07_字符设备驱动程序的另一种注册方法.md new file mode 100644 index 0000000..c458562 --- /dev/null +++ b/STM32MP157/doc_pic/09_UART/07_字符设备驱动程序的另一种注册方法.md @@ -0,0 +1,115 @@ +## 字符设备驱动程序的另一种注册方法 + +参考资料 + +* 参考代码：`drivers\char\pc8736x_gpio.c` + +* 本节课程源码在GIT仓库里 + + ```shell + 驱动大全: + doc_and_source_for_drivers\IMX6ULL\source\09_UART\ + 03_char_dev_driver\ + 01b_hello_drv + doc_and_source_for_drivers\STM32MP157\source\A7\09_UART\ + 03_char_dev_driver\ + 01b_hello_drv + + 快速入门: + 01_all_series_quickstart\05_嵌入式Linux驱动开发基础知识\source\ + 01b_hello_drv + ``` + + + +### 1. 字符设备驱动程序框架 + +![image-20210721184155242](pic/09_UART/22_chr_dev_driver.png) + + + +编写驱动程序的套路： +* 确定主设备号，也可以让内核分配 +* 定义自己的file_operations结构体 +* 实现对应的drv_open/drv_read/drv_write等函数，填入file_operations结构体 +* 把file_operations结构体告诉内核：register_chrdev +* 谁来注册驱动程序啊？得有一个入口函数：安装驱动程序时，就会去调用这个入口函数 +* 有入口函数就应该有出口函数：卸载驱动程序时，出口函数调用unregister_chrdev +* 其他完善：提供设备信息，自动创建设备节点：class_create, device_create + + + + + +### 2. 新的注册方法 + +参考代码：`drivers\char\pc8736x_gpio.c` + +* 注册字符设备区域 + * 有主设备号：register_chrdev_region + * 无主设备号：alloc_chrdev_region +* 分配/设置/注册cdev + * cdev_alloc + * cdev_init + * cdev_add + + + + + +### 3. 上机实验 + +#### 3.1 IMX6ULL + +先设置工具链： + +```shell +export ARCH=arm +export CROSS_COMPILE=arm-buildroot-linux-gnueabihf- +export PATH=$PATH:/home/book/100ask_imx6ull-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/bin +``` + + + +编译、执行程序: + +```shell +Ubuntu: +cd 01_hello_drv\ +make + +开发板: +insmod hello_drv.ko +./hello_drv_test -w abcd +./hello_drv_test -r +``` + + + +#### 3.2 STM32MP157 + +先设置工具链： + +```shell +export ARCH=arm +export CROSS_COMPILE=arm-buildroot-linux-gnueabihf- +export PATH=$PATH:/home/book/100ask_stm32mp157_pro-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/bin +``` + + + +编译、执行程序: + +```shell +Ubuntu: +cd 01_hello_drv\ +make + +开发板: +insmod hello_drv.ko +./hello_drv_test -w abcd +./hello_drv_test -r +``` + + + diff --git a/STM32MP157/doc_pic/09_UART/pic/09_UART/22_chr_dev_driver.png b/STM32MP157/doc_pic/09_UART/pic/09_UART/22_chr_dev_driver.png new file mode 100644 index 0000000..108d53a Binary files /dev/null and b/STM32MP157/doc_pic/09_UART/pic/09_UART/22_chr_dev_driver.png differ diff --git a/STM32MP157/source/A7/09_UART/03_char_dev_driver/01_hello_drv/Makefile b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01_hello_drv/Makefile new file mode 100644 index 0000000..e627dc4 --- /dev/null +++ b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01_hello_drv/Makefile @@ -0,0 +1,21 @@ + +# 1. 使用不同的开发板内核时, 一定要修改KERN_DIR +# 2. KERN_DIR中的内核要事先配置、编译, 为了能编译内核, 要先设置下列环境变量: +# 2.1 ARCH, 比如: export ARCH=arm64 +# 2.2 CROSS_COMPILE, 比如: export CROSS_COMPILE=aarch64-linux-gnu- +# 2.3 PATH, 比如: export PATH=$PATH:/home/book/100ask_roc-rk3399-pc/ToolChain-6.3.1/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin +# 注意: 不同的开发板不同的编译器上述3个环境变量不一定相同, +# 请参考各开发板的高级用户使用手册 + +KERN_DIR = /home/book/100ask_stm32mp157_pro-sdk/Linux-5.4 + +all: + make -C $(KERN_DIR) M=`pwd` modules + $(CROSS_COMPILE)gcc -o hello_drv_test hello_drv_test.c + +clean: + make -C $(KERN_DIR) M=`pwd` modules clean + rm -rf modules.order + rm -f hello_drv_test + +obj-m += hello_drv.o diff --git a/STM32MP157/source/A7/09_UART/03_char_dev_driver/01_hello_drv/hello_drv.c b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01_hello_drv/hello_drv.c new file mode 100644 index 0000000..c03f40e --- /dev/null +++ b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01_hello_drv/hello_drv.c @@ -0,0 +1,104 @@ +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* 1. 确定主设备号 */ +static int major = 0; +static char kernel_buf[1024]; +static struct class *hello_class; + + +#define MIN(a, b) (a < b ? a : b) + +/* 3. 实现对应的open/read/write等函数，填入file_operations结构体 */ +static ssize_t hello_drv_read (struct file *file, char __user *buf, size_t size, loff_t *offset) +{ + int err; + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + err = copy_to_user(buf, kernel_buf, MIN(1024, size)); + return MIN(1024, size); +} + +static ssize_t hello_drv_write (struct file *file, const char __user *buf, size_t size, loff_t *offset) +{ + int err; + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + err = copy_from_user(kernel_buf, buf, MIN(1024, size)); + return MIN(1024, size); +} + +static int hello_drv_open (struct inode *node, struct file *file) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + return 0; +} + +static int hello_drv_close (struct inode *node, struct file *file) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + return 0; +} + +/* 2. 定义自己的file_operations结构体 */ +static struct file_operations hello_drv = { + .owner = THIS_MODULE, + .open = hello_drv_open, + .read = hello_drv_read, + .write = hello_drv_write, + .release = hello_drv_close, +}; + +/* 4. 把file_operations结构体告诉内核：注册驱动程序 */ +/* 5. 谁来注册驱动程序啊？得有一个入口函数：安装驱动程序时，就会去调用这个入口函数 */ +static int __init hello_init(void) +{ + int err; + + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + major = register_chrdev(0, "hello", &hello_drv); /* /dev/hello */ + + + hello_class = class_create(THIS_MODULE, "hello_class"); + err = PTR_ERR(hello_class); + if (IS_ERR(hello_class)) { + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + unregister_chrdev(major, "hello"); + return -1; + } + + device_create(hello_class, NULL, MKDEV(major, 0), NULL, "hello"); /* /dev/hello */ + + return 0; +} + +/* 6. 有入口函数就应该有出口函数：卸载驱动程序时，就会去调用这个出口函数 */ +static void __exit hello_exit(void) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + device_destroy(hello_class, MKDEV(major, 0)); + class_destroy(hello_class); + unregister_chrdev(major, "hello"); +} + + +/* 7. 其他完善：提供设备信息，自动创建设备节点 */ + +module_init(hello_init); +module_exit(hello_exit); + +MODULE_LICENSE("GPL"); + + diff --git a/STM32MP157/source/A7/09_UART/03_char_dev_driver/01_hello_drv/hello_drv_test.c b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01_hello_drv/hello_drv_test.c new file mode 100644 index 0000000..28b2fba --- /dev/null +++ b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01_hello_drv/hello_drv_test.c @@ -0,0 +1,54 @@ + +#include +#include +#include +#include +#include +#include + +/* + * ./hello_drv_test -w abc + * ./hello_drv_test -r + */ +int main(int argc, char **argv) +{ + int fd; + char buf[1024]; + int len; + + /* 1. 判断参数 */ + if (argc < 2) + { + printf("Usage: %s -w \n", argv[0]); + printf(" %s -r\n", argv[0]); + return -1; + } + + /* 2. 打开文件 */ + fd = open("/dev/hello", O_RDWR); + if (fd == -1) + { + printf("can not open file /dev/hello\n"); + return -1; + } + + /* 3. 写文件或读文件 */ + if ((0 == strcmp(argv[1], "-w")) && (argc == 3)) + { + len = strlen(argv[2]) + 1; + len = len < 1024 ? len : 1024; + write(fd, argv[2], len); + } + else + { + len = read(fd, buf, 1024); + buf[1023] = '\0'; + printf("APP read : %s\n", buf); + } + + close(fd); + + return 0; +} + + diff --git a/STM32MP157/source/A7/09_UART/03_char_dev_driver/01b_hello_drv/Makefile b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01b_hello_drv/Makefile new file mode 100644 index 0000000..e627dc4 --- /dev/null +++ b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01b_hello_drv/Makefile @@ -0,0 +1,21 @@ + +# 1. 使用不同的开发板内核时, 一定要修改KERN_DIR +# 2. KERN_DIR中的内核要事先配置、编译, 为了能编译内核, 要先设置下列环境变量: +# 2.1 ARCH, 比如: export ARCH=arm64 +# 2.2 CROSS_COMPILE, 比如: export CROSS_COMPILE=aarch64-linux-gnu- +# 2.3 PATH, 比如: export PATH=$PATH:/home/book/100ask_roc-rk3399-pc/ToolChain-6.3.1/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin +# 注意: 不同的开发板不同的编译器上述3个环境变量不一定相同, +# 请参考各开发板的高级用户使用手册 + +KERN_DIR = /home/book/100ask_stm32mp157_pro-sdk/Linux-5.4 + +all: + make -C $(KERN_DIR) M=`pwd` modules + $(CROSS_COMPILE)gcc -o hello_drv_test hello_drv_test.c + +clean: + make -C $(KERN_DIR) M=`pwd` modules clean + rm -rf modules.order + rm -f hello_drv_test + +obj-m += hello_drv.o diff --git a/STM32MP157/source/A7/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv.c b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv.c new file mode 100644 index 0000000..a9543ff --- /dev/null +++ b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv.c @@ -0,0 +1,114 @@ +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* 1. 确定主设备号 */ +static int major = 0; +static struct cdev hello_cdev; + +static char kernel_buf[1024]; +static struct class *hello_class; + + +#define MIN(a, b) (a < b ? a : b) + +/* 3. 实现对应的open/read/write等函数，填入file_operations结构体 */ +static ssize_t hello_drv_read (struct file *file, char __user *buf, size_t size, loff_t *offset) +{ + int err; + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + err = copy_to_user(buf, kernel_buf, MIN(1024, size)); + return MIN(1024, size); +} + +static ssize_t hello_drv_write (struct file *file, const char __user *buf, size_t size, loff_t *offset) +{ + int err; + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + err = copy_from_user(kernel_buf, buf, MIN(1024, size)); + return MIN(1024, size); +} + +static int hello_drv_open (struct inode *node, struct file *file) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + return 0; +} + +static int hello_drv_close (struct inode *node, struct file *file) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + return 0; +} + +/* 2. 定义自己的file_operations结构体 */ +static struct file_operations hello_drv = { + .owner = THIS_MODULE, + .open = hello_drv_open, + .read = hello_drv_read, + .write = hello_drv_write, + .release = hello_drv_close, +}; + +/* 4. 把file_operations结构体告诉内核：注册驱动程序 */ +/* 5. 谁来注册驱动程序啊？得有一个入口函数：安装驱动程序时，就会去调用这个入口函数 */ +static int __init hello_init(void) +{ + int err; + int rc; + dev_t devid; + + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + //major = register_chrdev(0, "hello", &hello_drv); /* /dev/hello */ + rc = alloc_chrdev_region(&devid, 0, 1, "hello"); + major = MAJOR(devid); + cdev_init(&hello_cdev, &hello_drv); + cdev_add(&hello_cdev, devid, 1); + + hello_class = class_create(THIS_MODULE, "hello_class"); + err = PTR_ERR(hello_class); + if (IS_ERR(hello_class)) { + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + unregister_chrdev(major, "hello"); + return -1; + } + + device_create(hello_class, NULL, MKDEV(major, 0), NULL, "hello"); /* /dev/hello */ + + return 0; +} + +/* 6. 有入口函数就应该有出口函数：卸载驱动程序时，就会去调用这个出口函数 */ +static void __exit hello_exit(void) +{ + printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__); + device_destroy(hello_class, MKDEV(major, 0)); + class_destroy(hello_class); + + //unregister_chrdev(major, "hello"); + cdev_del(&hello_cdev); + unregister_chrdev_region(MKDEV(major,0), 1); +} + + +/* 7. 其他完善：提供设备信息，自动创建设备节点 */ + +module_init(hello_init); +module_exit(hello_exit); + +MODULE_LICENSE("GPL"); + + diff --git a/STM32MP157/source/A7/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv_test.c b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv_test.c new file mode 100644 index 0000000..28b2fba --- /dev/null +++ b/STM32MP157/source/A7/09_UART/03_char_dev_driver/01b_hello_drv/hello_drv_test.c @@ -0,0 +1,54 @@ + +#include +#include +#include +#include +#include +#include + +/* + * ./hello_drv_test -w abc + * ./hello_drv_test -r + */ +int main(int argc, char **argv) +{ + int fd; + char buf[1024]; + int len; + + /* 1. 判断参数 */ + if (argc < 2) + { + printf("Usage: %s -w \n", argv[0]); + printf(" %s -r\n", argv[0]); + return -1; + } + + /* 2. 打开文件 */ + fd = open("/dev/hello", O_RDWR); + if (fd == -1) + { + printf("can not open file /dev/hello\n"); + return -1; + } + + /* 3. 写文件或读文件 */ + if ((0 == strcmp(argv[1], "-w")) && (argc == 3)) + { + len = strlen(argv[2]) + 1; + len = len < 1024 ? len : 1024; + write(fd, argv[2], len); + } + else + { + len = read(fd, buf, 1024); + buf[1023] = '\0'; + printf("APP read : %s\n", buf); + } + + close(fd); + + return 0; +} + +