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drivers\rtc\rtc-s3c.c s3c_rtc_init platform_driver_register s3c_rtc_probe rtc_device_register("s3c", &pdev->dev, &s3c_rtcops, THIS_MODULE) rtc_dev_prepare cdev_init(&rtc->char_dev, &rtc_dev_fops); rtc_dev_add_device cdev_add app: open("/dev/rtc0"); ------------------------------------------- kernel: sys_open rtc_dev_fops.open rtc_dev_open // 根据次设备号找到以前用"rtc_device_register"注册的rtc_device struct rtc_device *rtc = container_of(inode->i_cdev,struct rtc_device, char_dev); const struct rtc_class_ops *ops = rtc->ops; err = ops->open ? ops->open(rtc->dev.parent) : 0; s3c_rtc_open app: ioctl(fd, RTC_RD_TIME,...) ------------------------------------------- kernel: sys_ioctl rtc_dev_fops.ioctl rtc_dev_ioctl struct rtc_device *rtc = file->private_data; rtc_read_time(rtc, &tm); err = rtc->ops->read_time(rtc->dev.parent, tm); s3c_rtc_gettime 测试RTC: 1. 修改arch\arm\plat-s3c24xx\common-smdk.c static struct platform_device __initdata *smdk_devs[] = { &s3c_device_nand, &smdk_led4, &smdk_led5, &smdk_led6, &smdk_led7, 改为(在数组smdk_devs里加上s3c_device_rtc): static struct platform_device __initdata *smdk_devs[] = { &s3c_device_nand, &smdk_led4, &smdk_led5, &smdk_led6, &smdk_led7, &s3c_device_rtc, 2. make uImage, 使用新内核启动 3. ls /dev/rtc* -l date /* 显示系统时间 */ date 123015402011.30 /* 设置系统时间 date [MMDDhhmm[[CC]YY][.ss]] */ hwclock -w /* 把系统时间写入RTC */ 短电,重启,执行date