212 lines
4.1 KiB
C
212 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Intel Corporation
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* Author: Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/platform_device.h>
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#include <linux/time-internal.h>
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#include <linux/suspend.h>
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#include <linux/err.h>
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#include <linux/rtc.h>
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#include <kern_util.h>
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#include <irq_kern.h>
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#include <os.h>
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#include "rtc.h"
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static time64_t uml_rtc_alarm_time;
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static bool uml_rtc_alarm_enabled;
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static struct rtc_device *uml_rtc;
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static int uml_rtc_irq_fd, uml_rtc_irq;
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#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
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static void uml_rtc_time_travel_alarm(struct time_travel_event *ev)
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{
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uml_rtc_send_timetravel_alarm();
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}
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static struct time_travel_event uml_rtc_alarm_event = {
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.fn = uml_rtc_time_travel_alarm,
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};
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#endif
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static int uml_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct timespec64 ts;
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/* Use this to get correct time in time-travel mode */
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read_persistent_clock64(&ts);
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rtc_time64_to_tm(timespec64_to_ktime(ts) / NSEC_PER_SEC, tm);
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return 0;
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}
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static int uml_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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rtc_time64_to_tm(uml_rtc_alarm_time, &alrm->time);
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alrm->enabled = uml_rtc_alarm_enabled;
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return 0;
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}
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static int uml_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
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{
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unsigned long long secs;
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if (!enable && !uml_rtc_alarm_enabled)
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return 0;
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uml_rtc_alarm_enabled = enable;
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secs = uml_rtc_alarm_time - ktime_get_real_seconds();
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if (time_travel_mode == TT_MODE_OFF) {
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if (!enable) {
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uml_rtc_disable_alarm();
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return 0;
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}
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/* enable or update */
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return uml_rtc_enable_alarm(secs);
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} else {
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time_travel_del_event(¨_rtc_alarm_event);
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if (enable)
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time_travel_add_event_rel(¨_rtc_alarm_event,
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secs * NSEC_PER_SEC);
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}
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return 0;
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}
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static int uml_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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uml_rtc_alarm_irq_enable(dev, 0);
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uml_rtc_alarm_time = rtc_tm_to_time64(&alrm->time);
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uml_rtc_alarm_irq_enable(dev, alrm->enabled);
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return 0;
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}
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static const struct rtc_class_ops uml_rtc_ops = {
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.read_time = uml_rtc_read_time,
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.read_alarm = uml_rtc_read_alarm,
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.alarm_irq_enable = uml_rtc_alarm_irq_enable,
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.set_alarm = uml_rtc_set_alarm,
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};
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static irqreturn_t uml_rtc_interrupt(int irq, void *data)
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{
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unsigned long long c = 0;
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/* alarm triggered, it's now off */
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uml_rtc_alarm_enabled = false;
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os_read_file(uml_rtc_irq_fd, &c, sizeof(c));
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WARN_ON(c == 0);
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pm_system_wakeup();
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rtc_update_irq(uml_rtc, 1, RTC_IRQF | RTC_AF);
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return IRQ_HANDLED;
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}
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static int uml_rtc_setup(void)
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{
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int err;
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err = uml_rtc_start(time_travel_mode != TT_MODE_OFF);
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if (WARN(err < 0, "err = %d\n", err))
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return err;
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uml_rtc_irq_fd = err;
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err = um_request_irq(UM_IRQ_ALLOC, uml_rtc_irq_fd, IRQ_READ,
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uml_rtc_interrupt, 0, "rtc", NULL);
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if (err < 0) {
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uml_rtc_stop(time_travel_mode != TT_MODE_OFF);
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return err;
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}
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irq_set_irq_wake(err, 1);
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uml_rtc_irq = err;
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return 0;
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}
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static void uml_rtc_cleanup(void)
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{
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um_free_irq(uml_rtc_irq, NULL);
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uml_rtc_stop(time_travel_mode != TT_MODE_OFF);
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}
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static int uml_rtc_probe(struct platform_device *pdev)
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{
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int err;
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err = uml_rtc_setup();
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if (err)
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return err;
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uml_rtc = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(uml_rtc)) {
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err = PTR_ERR(uml_rtc);
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goto cleanup;
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}
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uml_rtc->ops = ¨_rtc_ops;
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device_init_wakeup(&pdev->dev, 1);
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err = devm_rtc_register_device(uml_rtc);
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if (err)
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goto cleanup;
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return 0;
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cleanup:
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uml_rtc_cleanup();
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return err;
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}
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static int uml_rtc_remove(struct platform_device *pdev)
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{
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device_init_wakeup(&pdev->dev, 0);
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uml_rtc_cleanup();
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return 0;
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}
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static struct platform_driver uml_rtc_driver = {
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.probe = uml_rtc_probe,
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.remove = uml_rtc_remove,
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.driver = {
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.name = "uml-rtc",
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},
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};
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static int __init uml_rtc_init(void)
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{
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struct platform_device *pdev;
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int err;
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err = platform_driver_register(¨_rtc_driver);
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if (err)
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return err;
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pdev = platform_device_alloc("uml-rtc", 0);
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if (!pdev) {
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err = -ENOMEM;
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goto unregister;
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}
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err = platform_device_add(pdev);
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if (err)
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goto unregister;
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return 0;
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unregister:
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platform_device_put(pdev);
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platform_driver_unregister(¨_rtc_driver);
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return err;
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}
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device_initcall(uml_rtc_init);
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