\u5728\u672c\u7ae0\u4e2d\uff0c\u6211\u4eec\u8bd5\u56fe\u5728 \u6211\u4eec\u5728 \u6211\u4eec\u8fd9\u4e2a\u5e94\u7528\u7a0b\u5e8f\u662f\u4e00\u4e2a\u6700\u7b80\u5355\u7684\u9a71\u52a8\uff0c\u5b83\u53ef\u4ee5\u4ece\u7528\u6237\u7a7a\u95f4\u8bfb\u53d6\u5b57\u7b26\u4e32\u3001\u5411\u7528\u6237\u7a7a\u95f4\u53d1\u9001\u5b57\u7b26\u4e32\uff0c\u9664\u6b64\u4e4b\u5916\u5b83\u6ca1\u6709\u5176\u4ed6\u7684\u529f\u80fd\u3002\u8fd9\u4e2a\u9a71\u52a8\u7684\u6587\u4ef6\u540d\u662f \u6211\u4eec\u5728 \u6211\u4eec\u5728 \u548c\uff1a<\/p>\n \u540c\u65f6\uff0c\u6211\u4eec\u5728 \u6211\u4eec\u8fd8\u9700\u8981\u5728 \u5b8c\u6210\u4e4b\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u8bd1\u7cfb\u7edf\u3002\u6211\u4eec\u53ef\u4ee5\u5728 \u6211\u4eec\u5199\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u6765\u9a8c\u8bc1\u9a71\u52a8\uff0c\u6587\u4ef6\u76ee\u5f55\u5982\u4e0b\uff1a<\/p>\n \u5176\u4e2d\uff0c\u6211\u4eec\u5728 \u5728 \u5728 \u6211\u4eec\u5728 \u5728\u672c\u7ae0\u4e2d\uff0c\u6211\u4eec\u8bd5\u56fe\u5728kernel\/driver\/misc\u4e0b\u6dfb\u52a0\u4e00\u4e2a\u81ea\u5df1\u7684\u9a71\u52a8\u7a0b\u5e8f\uff0c\u5e76\u5c06\u5176build-in\u5230 …<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[303],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/swordofmorning.com\/index.php\/wp-json\/wp\/v2\/posts\/1403"}],"collection":[{"href":"https:\/\/swordofmorning.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swordofmorning.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swordofmorning.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/swordofmorning.com\/index.php\/wp-json\/wp\/v2\/comments?post=1403"}],"version-history":[{"count":3,"href":"https:\/\/swordofmorning.com\/index.php\/wp-json\/wp\/v2\/posts\/1403\/revisions"}],"predecessor-version":[{"id":1406,"href":"https:\/\/swordofmorning.com\/index.php\/wp-json\/wp\/v2\/posts\/1403\/revisions\/1406"}],"wp:attachment":[{"href":"https:\/\/swordofmorning.com\/index.php\/wp-json\/wp\/v2\/media?parent=1403"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swordofmorning.com\/index.php\/wp-json\/wp\/v2\/categories?post=1403"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swordofmorning.com\/index.php\/wp-json\/wp\/v2\/tags?post=1403"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}kernel\/driver\/misc<\/code>\u4e0b\u6dfb\u52a0\u4e00\u4e2a\u81ea\u5df1\u7684\u9a71\u52a8\u7a0b\u5e8f\uff0c\u5e76\u5c06\u5176build-in<\/code>\u5230\u7cfb\u7edf\u4e2d\u3002<\/p>\nkernel\/driver\/misc<\/code>\u4e0b\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5939my_driver<\/code>\uff0c\u5e76\u6dfb\u52a0.c<\/code>\u3001Makefile<\/code>\u548cKconfig<\/code><\/p>\n\u4e00\u3001hello.c<\/h2>\n
hello.c<\/code>\uff0c\u8bbe\u5907\u540d\u662fmy_driver<\/code>\u3002<\/p>\n#include <linux\/module.h>\n#include <linux\/fs.h>\n#include <linux\/uaccess.h>\n#include <linux\/init.h>\n#include <linux\/miscdevice.h>\n\n#define DEVICE_NAME "my_driver"\n\nstatic ssize_t my_driver_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)\n{\n const char *hello_world = "Hello world";\n size_t len = strlen(hello_world);\n\n if (*ppos >= len)\n return 0;\n\n if (count > len - *ppos)\n count = len - *ppos;\n\n if (copy_to_user(buf, hello_world + *ppos, count))\n return -EFAULT;\n\n *ppos += count;\n return count;\n}\n\nstatic ssize_t my_driver_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)\n{\n char input_str[256];\n\n if (count > sizeof(input_str) - 1)\n count = sizeof(input_str) - 1;\n\n if (copy_from_user(input_str, buf, count))\n return -EFAULT;\n\n input_str[count] = '\\0';\n pr_info("Received string: %s\\n", input_str);\n\n return count;\n}\n\nstatic const struct file_operations my_driver_fops = {\n .owner = THIS_MODULE,\n .read = my_driver_read,\n .write = my_driver_write,\n};\n\nstatic struct miscdevice my_driver_device = {\n .minor = MISC_DYNAMIC_MINOR,\n .name = DEVICE_NAME,\n .fops = &my_driver_fops,\n};\n\nstatic int __init my_driver_init(void)\n{\n int ret;\n\n ret = misc_register(&my_driver_device);\n if (ret)\n pr_err("Failed to register misc device\\n");\n\n return ret;\n}\n\nstatic void __exit my_driver_exit(void)\n{\n misc_deregister(&my_driver_device);\n}\n\nmodule_init(my_driver_init);\nmodule_exit(my_driver_exit);\n\nMODULE_LICENSE("GPL");\nMODULE_AUTHOR("Your Name");\nMODULE_DESCRIPTION("A simple driver example");<\/code><\/pre>\n\u4e8c\u3001Makefile & Kconfig<\/h2>\n
Makefile<\/code>\u4e2d\u6dfb\u52a0\u5982\u4e0b\u5185\u5bb9\uff1a<\/p>\nobj-$(CONFIG_MYDRIVER) += hello.o<\/code><\/pre>\nKconfig<\/code>\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\nconfig ChooseMyDriver\n tristate "description"\n select MYDRIVER\n default y\n help\n Enable support for the my_driver device.<\/code><\/pre>\n\u4e09\u3001\u5176\u4ed6\u914d\u7f6e<\/h2>\n
misc\/Kconfig<\/code>\u4e2d\u6dfb\u52a0\uff1a<\/p>\nconfig MYDRIVER\n tristate "description"\n default y\n help\n Say Sth.<\/code><\/pre>\nsource "drivers\/misc\/my_driver\/Kconfig"<\/code><\/pre>\nmisc\/Makefile<\/code>\u4e2d\u6dfb\u52a0\uff1a<\/p>\nobj-$(CONFIG_MYDRIVER) += my_driver\/<\/code><\/pre>\nkernel<\/code>\u7684.config<\/code>\u6587\u4ef6(\u8fd9\u91cc\u7528\u7684\u662frv1126_defconfig<\/code>)\u4e2d\u6dfb\u52a0\uff1a<\/p>\nCONFIG_ChooseMyDriver=y<\/code><\/pre>\n\/dev\/<\/code>\u4e0b\u53d1\u73b0dev\/my_driver<\/code>\u8bbe\u5907\uff0c\u8bc1\u660e\u5176\u88ab\u52a0\u8f7d\u6210\u529f\u3002<\/p>\n\u56db\u3001\u9a8c\u8bc1\u7a0b\u5e8f<\/h2>\n
.\n\u251c\u2500\u2500 build\n\u251c\u2500\u2500 CMakeLists.txt\n\u2514\u2500\u2500 src\n \u251c\u2500\u2500 CMakeLists.txt\n \u2514\u2500\u2500 main.cpp<\/code><\/pre>\n.\/build<\/code>\u4e2d\u6784\u5efa\u7a0b\u5e8f\uff1bsrc<\/code>\u7528\u6765\u5b58\u653e\u6e90\u7801\u3002<\/p>\n.\/CMakeLists.txt<\/code>\u4e2d\uff0c\u5176\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\nPROJECT(Test_Driver_Application)\n\nCMAKE_MINIMUM_REQUIRED(VERSION 3.5)\n\nSET(COMPILER_PATH "\/home\/xjt\/_Workspace_\/RV1126\/RV1126_RV1109_LINUX_SDK_V2.2.5.1_20230530\/buildroot\/output\/rockchip_rv1126_rv1109\/host\/bin\/")\n\nSET(CMAKE_C_COMPILER ${COMPILER_PATH}arm-linux-gnueabihf-gcc)\nSET(CMAKE_CXX_COMPILER ${COMPILER_PATH}arm-linux-gnueabihf-g++)\n\nSET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -s -O3 -lrt")\nSET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s -O3 -lrt")\n\nADD_SUBDIRECTORY(src bin)<\/code><\/pre>\n.\/src\/CMakeLists.txt<\/code>\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\nFILE(\n GLOB_RECURSE SRC_LIST \n .\/*.c\n .\/*.cpp\n)\n\n# Exe output path\nSET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR\/bin})\n\nADD_EXECUTABLE(demo ${SRC_LIST})\n\n# Link lib and so\nTARGET_LINK_LIBRARIES(\n demo\n)<\/code><\/pre>\nmain.c<\/code>\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n#include <stdio.h>\n#include <stdlib.h>\n#include <string.h>\n#include <fcntl.h>\n#include <unistd.h>\n\n#define DEVICE_PATH "\/dev\/my_driver"\n\nint main(void)\n{\n int fd;\n char buffer[256];\n ssize_t bytes_read, bytes_written;\n\n fd = open(DEVICE_PATH, O_RDWR);\n if (fd == -1) {\n perror("Failed to open device");\n exit(EXIT_FAILURE);\n }\n\n bytes_read = read(fd, buffer, sizeof(buffer));\n if (bytes_read == -1) {\n perror("Failed to read from device");\n close(fd);\n exit(EXIT_FAILURE);\n }\n\n printf("Read from device: %.*s\\n", (int)bytes_read, buffer);\n\n strcpy(buffer, "Hello from user space");\n bytes_written = write(fd, buffer, strlen(buffer));\n if (bytes_written == -1) {\n perror("Failed to write to device");\n close(fd);\n exit(EXIT_FAILURE);\n }\n\n close(fd);\n return 0;\n}<\/code><\/pre>\n.\/build<\/code>\u4e0b\u6267\u884ccmake ..<\/code>\uff0c\u4e4b\u540e\u518d\u76f4\u63a5make<\/code>\u3002\u5373\u53ef\u5728.\/build\/bin<\/code>\u4e0b\u627e\u5230\u6700\u7ec8\u7684\u7a0b\u5e8fdemo<\/code>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"