2009-03-31 16:24:48 -06:00
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/*
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* rtc-efi: RTC Class Driver for EFI-based systems
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*
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* Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
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*
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* Author: dann frazier <dannf@hp.com>
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* Based on efirtc.c by Stephane Eranian
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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2013-02-21 17:45:25 -07:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2009-03-31 16:24:48 -06:00
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#include <linux/kernel.h>
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#include <linux/module.h>
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2014-08-08 15:20:09 -06:00
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#include <linux/stringify.h>
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2009-03-31 16:24:48 -06:00
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#include <linux/time.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/efi.h>
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#define EFI_ISDST (EFI_TIME_ADJUST_DAYLIGHT|EFI_TIME_IN_DAYLIGHT)
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/*
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* EFI Epoch is 1/1/1998
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*/
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#define EFI_RTC_EPOCH 1998
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/*
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* returns day of the year [0-365]
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*/
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static inline int
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compute_yday(efi_time_t *eft)
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{
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/* efi_time_t.month is in the [1-12] so, we need -1 */
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2014-06-06 15:35:48 -06:00
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return rtc_year_days(eft->day, eft->month - 1, eft->year);
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2009-03-31 16:24:48 -06:00
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}
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/*
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* returns day of the week [0-6] 0=Sunday
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*
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* Don't try to provide a year that's before 1998, please !
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*/
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static int
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compute_wday(efi_time_t *eft)
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{
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int y;
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int ndays = 0;
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2014-08-08 15:20:09 -06:00
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if (eft->year < EFI_RTC_EPOCH) {
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pr_err("EFI year < " __stringify(EFI_RTC_EPOCH) ", invalid date\n");
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2009-03-31 16:24:48 -06:00
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return -1;
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}
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for (y = EFI_RTC_EPOCH; y < eft->year; y++)
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ndays += 365 + (is_leap_year(y) ? 1 : 0);
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ndays += compute_yday(eft);
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/*
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* 4=1/1/1998 was a Thursday
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*/
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return (ndays + 4) % 7;
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}
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static void
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convert_to_efi_time(struct rtc_time *wtime, efi_time_t *eft)
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{
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eft->year = wtime->tm_year + 1900;
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eft->month = wtime->tm_mon + 1;
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eft->day = wtime->tm_mday;
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eft->hour = wtime->tm_hour;
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eft->minute = wtime->tm_min;
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2013-02-21 17:45:25 -07:00
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eft->second = wtime->tm_sec;
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2009-03-31 16:24:48 -06:00
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eft->nanosecond = 0;
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eft->daylight = wtime->tm_isdst ? EFI_ISDST : 0;
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eft->timezone = EFI_UNSPECIFIED_TIMEZONE;
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}
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2014-08-08 15:20:09 -06:00
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static bool
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2009-03-31 16:24:48 -06:00
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convert_from_efi_time(efi_time_t *eft, struct rtc_time *wtime)
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{
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memset(wtime, 0, sizeof(*wtime));
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2014-08-08 15:20:09 -06:00
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if (eft->second >= 60)
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return false;
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2009-03-31 16:24:48 -06:00
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wtime->tm_sec = eft->second;
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2014-08-08 15:20:09 -06:00
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if (eft->minute >= 60)
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return false;
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2009-03-31 16:24:48 -06:00
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wtime->tm_min = eft->minute;
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2014-08-08 15:20:09 -06:00
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if (eft->hour >= 24)
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return false;
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2009-03-31 16:24:48 -06:00
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wtime->tm_hour = eft->hour;
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2014-08-08 15:20:09 -06:00
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if (!eft->day || eft->day > 31)
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return false;
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2009-03-31 16:24:48 -06:00
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wtime->tm_mday = eft->day;
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2014-08-08 15:20:09 -06:00
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if (!eft->month || eft->month > 12)
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return false;
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2009-03-31 16:24:48 -06:00
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wtime->tm_mon = eft->month - 1;
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wtime->tm_year = eft->year - 1900;
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/* day of the week [0-6], Sunday=0 */
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wtime->tm_wday = compute_wday(eft);
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2014-08-08 15:20:09 -06:00
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if (wtime->tm_wday < 0)
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return false;
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2009-03-31 16:24:48 -06:00
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/* day in the year [1-365]*/
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wtime->tm_yday = compute_yday(eft);
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switch (eft->daylight & EFI_ISDST) {
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case EFI_ISDST:
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wtime->tm_isdst = 1;
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break;
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case EFI_TIME_ADJUST_DAYLIGHT:
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wtime->tm_isdst = 0;
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break;
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default:
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wtime->tm_isdst = -1;
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}
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2014-08-08 15:20:09 -06:00
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return true;
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2009-03-31 16:24:48 -06:00
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}
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static int efi_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
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{
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efi_time_t eft;
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efi_status_t status;
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/*
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* As of EFI v1.10, this call always returns an unsupported status
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*/
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status = efi.get_wakeup_time((efi_bool_t *)&wkalrm->enabled,
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(efi_bool_t *)&wkalrm->pending, &eft);
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if (status != EFI_SUCCESS)
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return -EINVAL;
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2014-08-08 15:20:09 -06:00
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if (!convert_from_efi_time(&eft, &wkalrm->time))
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return -EIO;
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2009-03-31 16:24:48 -06:00
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return rtc_valid_tm(&wkalrm->time);
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}
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static int efi_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
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{
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efi_time_t eft;
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efi_status_t status;
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convert_to_efi_time(&wkalrm->time, &eft);
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/*
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* XXX Fixme:
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* As of EFI 0.92 with the firmware I have on my
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* machine this call does not seem to work quite
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* right
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*
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* As of v1.10, this call always returns an unsupported status
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*/
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status = efi.set_wakeup_time((efi_bool_t)wkalrm->enabled, &eft);
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2013-02-21 17:45:25 -07:00
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dev_warn(dev, "write status is %d\n", (int)status);
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2009-03-31 16:24:48 -06:00
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return status == EFI_SUCCESS ? 0 : -EINVAL;
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}
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static int efi_read_time(struct device *dev, struct rtc_time *tm)
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{
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efi_status_t status;
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efi_time_t eft;
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efi_time_cap_t cap;
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status = efi.get_time(&eft, &cap);
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if (status != EFI_SUCCESS) {
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/* should never happen */
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2013-02-21 17:45:25 -07:00
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dev_err(dev, "can't read time\n");
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2009-03-31 16:24:48 -06:00
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return -EINVAL;
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}
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2014-08-08 15:20:09 -06:00
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if (!convert_from_efi_time(&eft, tm))
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return -EIO;
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2009-03-31 16:24:48 -06:00
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return rtc_valid_tm(tm);
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}
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static int efi_set_time(struct device *dev, struct rtc_time *tm)
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{
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efi_status_t status;
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efi_time_t eft;
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convert_to_efi_time(tm, &eft);
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status = efi.set_time(&eft);
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return status == EFI_SUCCESS ? 0 : -EINVAL;
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}
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static const struct rtc_class_ops efi_rtc_ops = {
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.read_time = efi_read_time,
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.set_time = efi_set_time,
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.read_alarm = efi_read_alarm,
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.set_alarm = efi_set_alarm,
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};
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static int __init efi_rtc_probe(struct platform_device *dev)
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{
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struct rtc_device *rtc;
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2013-04-29 17:19:36 -06:00
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rtc = devm_rtc_device_register(&dev->dev, "rtc-efi", &efi_rtc_ops,
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2009-03-31 16:24:48 -06:00
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THIS_MODULE);
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if (IS_ERR(rtc))
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return PTR_ERR(rtc);
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2015-01-13 05:28:53 -07:00
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rtc->uie_unsupported = 1;
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2009-03-31 16:24:48 -06:00
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platform_set_drvdata(dev, rtc);
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return 0;
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}
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static struct platform_driver efi_rtc_driver = {
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.driver = {
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.name = "rtc-efi",
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},
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};
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2013-04-29 17:18:40 -06:00
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module_platform_driver_probe(efi_rtc_driver, efi_rtc_probe);
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2009-03-31 16:24:48 -06:00
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2014-09-25 17:05:22 -06:00
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MODULE_ALIAS("platform:rtc-efi");
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2009-03-31 16:24:48 -06:00
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MODULE_AUTHOR("dann frazier <dannf@hp.com>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("EFI RTC driver");
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2014-09-11 02:20:40 -06:00
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MODULE_ALIAS("platform:rtc-efi");
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