/*
   * An RTC test device/driver
   * Copyright (C) 2005 Tower Technologies
   * Author: Alessandro Zummo <a.zummo@towertech.it>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <linux/module.h>
  #include <linux/err.h>
  #include <linux/rtc.h>
  #include <linux/platform_device.h>
  
  static struct platform_device *test0 = NULL, *test1 = NULL;
  
  static int test_rtc_read_alarm(struct device *dev,
  	struct rtc_wkalrm *alrm)
  {
  	return 0;
  }
  
  static int test_rtc_set_alarm(struct device *dev,
  	struct rtc_wkalrm *alrm)
  {
  	return 0;
  }
  
  static int test_rtc_read_time(struct device *dev,
  	struct rtc_time *tm)
  {
  	rtc_time_to_tm(get_seconds(), tm);
  	return 0;
  }

  static int test_rtc_set_mmss(struct device *dev, unsigned long secs)
  {

  	dev_info(dev, "%s, secs = %lu
  ", __func__, secs);

  	return 0;
  }
  
  static int test_rtc_proc(struct device *dev, struct seq_file *seq)
  {
  	struct platform_device *plat_dev = to_platform_device(dev);

  	seq_printf(seq, "test\t\t: yes
  ");
  	seq_printf(seq, "id\t\t: %d
  ", plat_dev->id);
  
  	return 0;
  }
  
  static int test_rtc_ioctl(struct device *dev, unsigned int cmd,
  	unsigned long arg)
  {
  	/* We do support interrupts, they're generated
  	 * using the sysfs interface.
  	 */
  	switch (cmd) {
  	case RTC_PIE_ON:
  	case RTC_PIE_OFF:
  	case RTC_UIE_ON:
  	case RTC_UIE_OFF:
  	case RTC_AIE_ON:
  	case RTC_AIE_OFF:
  		return 0;
  
  	default:

  		return -ENOIOCTLCMD;

  	}
  }

  static const struct rtc_class_ops test_rtc_ops = {

  	.proc = test_rtc_proc,
  	.read_time = test_rtc_read_time,

  	.read_alarm = test_rtc_read_alarm,
  	.set_alarm = test_rtc_set_alarm,
  	.set_mmss = test_rtc_set_mmss,
  	.ioctl = test_rtc_ioctl,
  };
  
  static ssize_t test_irq_show(struct device *dev,
  				struct device_attribute *attr, char *buf)
  {
  	return sprintf(buf, "%d
  ", 42);
  }
  static ssize_t test_irq_store(struct device *dev,
  				struct device_attribute *attr,
  				const char *buf, size_t count)
  {
  	int retval;
  	struct platform_device *plat_dev = to_platform_device(dev);
  	struct rtc_device *rtc = platform_get_drvdata(plat_dev);
  
  	retval = count;

  	local_irq_disable();

  	if (strncmp(buf, "tick", 4) == 0)

  		rtc_update_irq(rtc, 1, RTC_PF | RTC_IRQF);

  	else if (strncmp(buf, "alarm", 5) == 0)

  		rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);

  	else if (strncmp(buf, "update", 6) == 0)

  		rtc_update_irq(rtc, 1, RTC_UF | RTC_IRQF);

  	else
  		retval = -EINVAL;

  	local_irq_enable();

  
  	return retval;
  }
  static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store);
  
  static int test_probe(struct platform_device *plat_dev)
  {
  	int err;
  	struct rtc_device *rtc = rtc_device_register("test", &plat_dev->dev,
  						&test_rtc_ops, THIS_MODULE);
  	if (IS_ERR(rtc)) {
  		err = PTR_ERR(rtc);

  		return err;
  	}

  
  	err = device_create_file(&plat_dev->dev, &dev_attr_irq);
  	if (err)
  		goto err;

  
  	platform_set_drvdata(plat_dev, rtc);
  
  	return 0;

  
  err:
  	rtc_device_unregister(rtc);
  	return err;

  }
  
  static int __devexit test_remove(struct platform_device *plat_dev)
  {
  	struct rtc_device *rtc = platform_get_drvdata(plat_dev);
  
  	rtc_device_unregister(rtc);
  	device_remove_file(&plat_dev->dev, &dev_attr_irq);
  
  	return 0;
  }

  static struct platform_driver test_driver = {

  	.probe	= test_probe,
  	.remove = __devexit_p(test_remove),
  	.driver = {
  		.name = "rtc-test",
  		.owner = THIS_MODULE,
  	},
  };
  
  static int __init test_init(void)
  {
  	int err;

  	if ((err = platform_driver_register(&test_driver)))

  		return err;
  
  	if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
  		err = -ENOMEM;
  		goto exit_driver_unregister;
  	}
  
  	if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
  		err = -ENOMEM;
  		goto exit_free_test0;
  	}
  
  	if ((err = platform_device_add(test0)))
  		goto exit_free_test1;
  
  	if ((err = platform_device_add(test1)))
  		goto exit_device_unregister;
  
  	return 0;
  
  exit_device_unregister:
  	platform_device_unregister(test0);
  
  exit_free_test1:
  	platform_device_put(test1);
  
  exit_free_test0:
  	platform_device_put(test0);
  
  exit_driver_unregister:

  	platform_driver_unregister(&test_driver);

  	return err;
  }
  
  static void __exit test_exit(void)
  {
  	platform_device_unregister(test0);
  	platform_device_unregister(test1);

  	platform_driver_unregister(&test_driver);

  }
  
  MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
  MODULE_DESCRIPTION("RTC test driver/device");
  MODULE_LICENSE("GPL");
  
  module_init(test_init);
  module_exit(test_exit);