设备量产时，需要自动设置一个mac地址和sn，如果使用随机数生成的话，可能会有重复的，这里读取spi-nor的sn，参考sn来生成设备的mac和sn；
添加如下部分：
代码如下：
#include <linux/proc_fs.h> static ssize_t unique_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct spi_nor *nor = PDE_DATA(file_inode(file)); u8 unique[12]; u64 unique_id = 0; int i, tmp; tmp = nor->read_reg(nor, 0x4b, unique, 12); if (tmp < 0) { dev_dbg(nor->dev, " error %d reading unique ID\n", tmp); return 0; } for (i=4; i<11; i++) { unique_id |= unique[i]; unique_id = unique_id << 8; } unique_id |= unique[i]; return sprintf(buf, "%llx\n", unique_id); } static const struct file_operations spi_nor_proc_fops = { .read = unique_read, .llseek = default_llseek, }; static const struct spi_device_id *spi_nor_read_id(struct spi_nor *nor) { int tmp; u8 id[5]; u32 jedec; u16 ext_jedec; struct flash_info *info; //调用 proc_create_data("unique_id", 0666, NULL, &spi_nor_proc_fops, nor); tmp = nor->read_reg(nor, SPINOR_OP_RDID, id, 5); if (tmp < 0) { dev_dbg(nor->dev, " error %d reading JEDEC ID\n", tmp); return ERR_PTR(tmp); } jedec = id[0]; jedec = jedec << 8; jedec |= id[1]; jedec = jedec << 8; jedec |= id[2]; ext_jedec = id[3] << 8 | id[4]; for (tmp = 0; tmp < ARRAY_SIZE(spi_nor_ids) - 1; tmp++) { info = (void *)spi_nor_ids[tmp].driver_data; if (info->jedec_id == jedec) { if (info->ext_id == 0 || info->ext_id == ext_jedec) return &spi_nor_ids[tmp]; } } dev_err(nor->dev, "unrecognized JEDEC id %06x\n", jedec); return ERR_PTR(-ENODEV); }
然后应用层读取/proc/unique_id即可，应用层读取示例：
#include <stdint.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <getopt.h> #include <fcntl.h> #include <sys/types.h> #include <sys/stat.h> #include <string.h> #include <algorithm> #include <string> using namespace std; int main(void) { int fd; char uid[32] = {0}; int size; fd = open("/proc/unique_id", O_RDONLY); if (fd < 0) return 1; size = read(fd, uid, sizeof(uid)); close(fd); uid[strlen(uid)-1] = '\0'; //转为大写 std::string str = uid; std::transform(str.begin(), str.end(),str.begin(), ::toupper); printf("%s", str.c_str()); return 0; }
