191 lines
4.0 KiB
C
191 lines
4.0 KiB
C
/*
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* An RTC test device/driver
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* Copyright (C) 2005 Tower Technologies
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#define MAX_RTC_TEST 3
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struct rtc_test_data {
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struct rtc_device *rtc;
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time64_t offset;
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struct timer_list alarm;
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bool alarm_en;
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};
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struct platform_device *pdev[MAX_RTC_TEST];
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static int test_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rtc_test_data *rtd = dev_get_drvdata(dev);
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time64_t alarm;
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alarm = (rtd->alarm.expires - jiffies) / HZ;
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alarm += ktime_get_real_seconds() + rtd->offset;
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rtc_time64_to_tm(alarm, &alrm->time);
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alrm->enabled = rtd->alarm_en;
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return 0;
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}
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static int test_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rtc_test_data *rtd = dev_get_drvdata(dev);
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ktime_t timeout;
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u64 expires;
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timeout = rtc_tm_to_time64(&alrm->time) - ktime_get_real_seconds();
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timeout -= rtd->offset;
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del_timer(&rtd->alarm);
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expires = jiffies + timeout * HZ;
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if (expires > U32_MAX)
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expires = U32_MAX;
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pr_err("ABE: %s +%d %s\n", __FILE__, __LINE__, __func__);
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rtd->alarm.expires = expires;
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if (alrm->enabled)
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add_timer(&rtd->alarm);
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rtd->alarm_en = alrm->enabled;
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return 0;
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}
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static int test_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct rtc_test_data *rtd = dev_get_drvdata(dev);
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rtc_time64_to_tm(ktime_get_real_seconds() + rtd->offset, tm);
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return 0;
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}
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static int test_rtc_set_mmss64(struct device *dev, time64_t secs)
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{
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struct rtc_test_data *rtd = dev_get_drvdata(dev);
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rtd->offset = secs - ktime_get_real_seconds();
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return 0;
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}
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static int test_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
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{
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struct rtc_test_data *rtd = dev_get_drvdata(dev);
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rtd->alarm_en = enable;
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if (enable)
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add_timer(&rtd->alarm);
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else
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del_timer(&rtd->alarm);
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return 0;
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}
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static const struct rtc_class_ops test_rtc_ops = {
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.read_time = test_rtc_read_time,
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.read_alarm = test_rtc_read_alarm,
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.set_alarm = test_rtc_set_alarm,
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.set_mmss64 = test_rtc_set_mmss64,
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.alarm_irq_enable = test_rtc_alarm_irq_enable,
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};
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static void test_rtc_alarm_handler(struct timer_list *t)
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{
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struct rtc_test_data *rtd = from_timer(rtd, t, alarm);
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rtc_update_irq(rtd->rtc, 1, RTC_AF | RTC_IRQF);
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}
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static int test_probe(struct platform_device *plat_dev)
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{
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struct rtc_test_data *rtd;
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rtd = devm_kzalloc(&plat_dev->dev, sizeof(*rtd), GFP_KERNEL);
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if (!rtd)
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return -ENOMEM;
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platform_set_drvdata(plat_dev, rtd);
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rtd->rtc = devm_rtc_device_register(&plat_dev->dev, "test",
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&test_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtd->rtc))
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return PTR_ERR(rtd->rtc);
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timer_setup(&rtd->alarm, test_rtc_alarm_handler, 0);
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rtd->alarm.expires = 0;
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return 0;
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}
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static struct platform_driver test_driver = {
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.probe = test_probe,
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.driver = {
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.name = "rtc-test",
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},
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};
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static int __init test_init(void)
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{
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int i, err;
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if ((err = platform_driver_register(&test_driver)))
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return err;
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err = -ENOMEM;
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for (i = 0; i < MAX_RTC_TEST; i++) {
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pdev[i] = platform_device_alloc("rtc-test", i);
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if (!pdev[i])
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goto exit_free_mem;
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}
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for (i = 0; i < MAX_RTC_TEST; i++) {
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err = platform_device_add(pdev[i]);
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if (err)
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goto exit_device_del;
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}
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return 0;
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exit_device_del:
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for (; i > 0; i--)
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platform_device_del(pdev[i - 1]);
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exit_free_mem:
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for (i = 0; i < MAX_RTC_TEST; i++)
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platform_device_put(pdev[i]);
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platform_driver_unregister(&test_driver);
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return err;
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}
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static void __exit test_exit(void)
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{
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int i;
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for (i = 0; i < MAX_RTC_TEST; i++)
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platform_device_unregister(pdev[i]);
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platform_driver_unregister(&test_driver);
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}
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("RTC test driver/device");
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MODULE_LICENSE("GPL");
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module_init(test_init);
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module_exit(test_exit);
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