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标题: RTC实时时钟驱动（5） [打印本页]

作者: yuyang911220 时间: 2014-8-26 12:21 标题: RTC实时时钟驱动（5）

pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
      s3c_rtc_tickno, s3c_rtc_alarmno);

/* get the memory region */

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
      dev_err(&pdev->dev, "failed to get memory region resource\n");
      return -ENOENT;
}

s3c_rtc_mem = request_mem_region(res->start,
                  res->end-res->start+1,
                  pdev->name);

if (s3c_rtc_mem == NULL) {
      dev_err(&pdev->dev, "failed to reserve memory region\n");
      ret = -ENOENT;
      goto err_nores;
}

s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
if (s3c_rtc_base == NULL) {
      dev_err(&pdev->dev, "failed ioremap()\n");
      ret = -EINVAL;
      goto err_nomap;
}

/* check to see if everything is setup correctly */

s3c_rtc_enable(pdev, 1);

   pr_debug("s3c2410_rtc: RTCCON=%02x\n",
      readb(s3c_rtc_base + S3C2410_RTCCON));

s3c_rtc_setfreq(&pdev->dev, 1);

device_init_wakeup(&pdev->dev, 1);

/* register RTC and exit */

rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
               THIS_MODULE);

if (IS_ERR(rtc)) {
      dev_err(&pdev->dev, "cannot attach rtc\n");
      ret = PTR_ERR(rtc);
      goto err_nortc;
}

rtc->max_user_freq = 128;

platform_set_drvdata(pdev, rtc);
return 0;

err_nortc:
s3c_rtc_enable(pdev, 0);
iounmap(s3c_rtc_base);

err_nomap:
release_resource(s3c_rtc_mem);

err_nores:
return ret;
}

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