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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
97 lines
1.8 KiB
C
97 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*
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* This driver emulates a real time clock based on timer ticks.
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*/
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#include <common.h>
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#include <div64.h>
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#include <dm.h>
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#include <env.h>
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#include <generated/timestamp_autogenerated.h>
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#include <rtc.h>
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/**
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* struct emul_rtc - private data for emulated RTC driver
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*/
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struct emul_rtc {
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/**
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* @offset_us: microseconds from 1970-01-01 to timer_get_us() base
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*/
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u64 offset_us;
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/**
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* @isdst: daylight saving time
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*/
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int isdst;
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};
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static int emul_rtc_get(struct udevice *dev, struct rtc_time *time)
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{
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struct emul_rtc *priv = dev_get_priv(dev);
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u64 now;
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now = timer_get_us() + priv->offset_us;
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do_div(now, 1000000);
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rtc_to_tm(now, time);
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time->tm_isdst = priv->isdst;
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return 0;
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}
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static int emul_rtc_set(struct udevice *dev, const struct rtc_time *time)
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{
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struct emul_rtc *priv = dev_get_priv(dev);
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if (time->tm_year < 1970)
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return -EINVAL;
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priv->offset_us = rtc_mktime(time) * 1000000ULL - timer_get_us();
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if (time->tm_isdst > 0)
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priv->isdst = 1;
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else if (time->tm_isdst < 0)
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priv->isdst = -1;
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else
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priv->isdst = 0;
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return 0;
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}
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int emul_rtc_probe(struct udevice *dev)
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{
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struct emul_rtc *priv = dev_get_priv(dev);
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const char *epoch_str;
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u64 epoch;
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epoch_str = env_get("rtc_emul_epoch");
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if (epoch_str) {
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epoch = simple_strtoull(epoch_str, NULL, 10);
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} else {
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/* Use the build date as initial time */
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epoch = U_BOOT_EPOCH;
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}
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priv->offset_us = epoch * 1000000ULL - timer_get_us();
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priv->isdst = -1;
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return 0;
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}
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static const struct rtc_ops emul_rtc_ops = {
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.get = emul_rtc_get,
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.set = emul_rtc_set,
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};
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U_BOOT_DRIVER(rtc_emul) = {
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.name = "rtc_emul",
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.id = UCLASS_RTC,
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.ops = &emul_rtc_ops,
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.probe = emul_rtc_probe,
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.priv_auto = sizeof(struct emul_rtc),
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};
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U_BOOT_DEVICE(rtc_emul) = {
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.name = "rtc_emul",
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};
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