Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * rtc-efi: RTC Class Driver for EFI-based systems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Author: dann frazier <dannf@dannf.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Based on efirtc.c by Stephane Eranian
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/stringify.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/rtc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define EFI_ISDST (EFI_TIME_ADJUST_DAYLIGHT|EFI_TIME_IN_DAYLIGHT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * returns day of the year [0-365]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) compute_yday(efi_time_t *eft)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	/* efi_time_t.month is in the [1-12] so, we need -1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	return rtc_year_days(eft->day, eft->month - 1, eft->year);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  * returns day of the week [0-6] 0=Sunday
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) compute_wday(efi_time_t *eft, int yday)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	int ndays = eft->year * (365 % 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		    + (eft->year - 1) / 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		    - (eft->year - 1) / 100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		    + (eft->year - 1) / 400
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		    + yday;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	 * 1/1/0000 may or may not have been a Sunday (if it ever existed at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	 * all) but assuming it was makes this calculation work correctly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	return ndays % 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) convert_to_efi_time(struct rtc_time *wtime, efi_time_t *eft)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	eft->year	= wtime->tm_year + 1900;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	eft->month	= wtime->tm_mon + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	eft->day	= wtime->tm_mday;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	eft->hour	= wtime->tm_hour;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	eft->minute	= wtime->tm_min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	eft->second	= wtime->tm_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	eft->nanosecond = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	eft->daylight	= wtime->tm_isdst ? EFI_ISDST : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	eft->timezone	= EFI_UNSPECIFIED_TIMEZONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) static bool
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) convert_from_efi_time(efi_time_t *eft, struct rtc_time *wtime)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	memset(wtime, 0, sizeof(*wtime));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	if (eft->second >= 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	wtime->tm_sec  = eft->second;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (eft->minute >= 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	wtime->tm_min  = eft->minute;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (eft->hour >= 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	wtime->tm_hour = eft->hour;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (!eft->day || eft->day > 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	wtime->tm_mday = eft->day;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (!eft->month || eft->month > 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	wtime->tm_mon  = eft->month - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	if (eft->year < 1900 || eft->year > 9999)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	wtime->tm_year = eft->year - 1900;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	/* day in the year [1-365]*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	wtime->tm_yday = compute_yday(eft);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	/* day of the week [0-6], Sunday=0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	wtime->tm_wday = compute_wday(eft, wtime->tm_yday);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	switch (eft->daylight & EFI_ISDST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	case EFI_ISDST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		wtime->tm_isdst = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	case EFI_TIME_ADJUST_DAYLIGHT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		wtime->tm_isdst = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		wtime->tm_isdst = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static int efi_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	efi_time_t eft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	efi_status_t status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	 * As of EFI v1.10, this call always returns an unsupported status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	status = efi.get_wakeup_time((efi_bool_t *)&wkalrm->enabled,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 				     (efi_bool_t *)&wkalrm->pending, &eft);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (status != EFI_SUCCESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (!convert_from_efi_time(&eft, &wkalrm->time))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	return rtc_valid_tm(&wkalrm->time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static int efi_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	efi_time_t eft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	efi_status_t status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	convert_to_efi_time(&wkalrm->time, &eft);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	 * XXX Fixme:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	 * As of EFI 0.92 with the firmware I have on my
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	 * machine this call does not seem to work quite
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	 * right
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	 * As of v1.10, this call always returns an unsupported status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	status = efi.set_wakeup_time((efi_bool_t)wkalrm->enabled, &eft);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	dev_warn(dev, "write status is %d\n", (int)status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	return status == EFI_SUCCESS ? 0 : -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int efi_read_time(struct device *dev, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	efi_status_t status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	efi_time_t eft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	efi_time_cap_t cap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	status = efi.get_time(&eft, &cap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	if (status != EFI_SUCCESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		/* should never happen */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		dev_err(dev, "can't read time\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (!convert_from_efi_time(&eft, tm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static int efi_set_time(struct device *dev, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	efi_status_t status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	efi_time_t eft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	convert_to_efi_time(tm, &eft);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	status = efi.set_time(&eft);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	return status == EFI_SUCCESS ? 0 : -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static int efi_procfs(struct device *dev, struct seq_file *seq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	efi_time_t      eft, alm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	efi_time_cap_t  cap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	efi_bool_t      enabled, pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	memset(&eft, 0, sizeof(eft));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	memset(&alm, 0, sizeof(alm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	memset(&cap, 0, sizeof(cap));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	efi.get_time(&eft, &cap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	efi.get_wakeup_time(&enabled, &pending, &alm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	seq_printf(seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		   "Time\t\t: %u:%u:%u.%09u\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		   "Date\t\t: %u-%u-%u\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		   "Daylight\t: %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		   eft.hour, eft.minute, eft.second, eft.nanosecond,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		   eft.year, eft.month, eft.day,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		   eft.daylight);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (eft.timezone == EFI_UNSPECIFIED_TIMEZONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		seq_puts(seq, "Timezone\t: unspecified\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		/* XXX fixme: convert to string? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		seq_printf(seq, "Timezone\t: %u\n", eft.timezone);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	seq_printf(seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		   "Alarm Time\t: %u:%u:%u.%09u\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		   "Alarm Date\t: %u-%u-%u\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		   "Alarm Daylight\t: %u\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		   "Enabled\t\t: %s\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		   "Pending\t\t: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		   alm.hour, alm.minute, alm.second, alm.nanosecond,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		   alm.year, alm.month, alm.day,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		   alm.daylight,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		   enabled == 1 ? "yes" : "no",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		   pending == 1 ? "yes" : "no");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (eft.timezone == EFI_UNSPECIFIED_TIMEZONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		seq_puts(seq, "Timezone\t: unspecified\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		/* XXX fixme: convert to string? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		seq_printf(seq, "Timezone\t: %u\n", alm.timezone);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	 * now prints the capabilities
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	seq_printf(seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		   "Resolution\t: %u\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		   "Accuracy\t: %u\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		   "SetstoZero\t: %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		   cap.resolution, cap.accuracy, cap.sets_to_zero);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static const struct rtc_class_ops efi_rtc_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	.read_time	= efi_read_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	.set_time	= efi_set_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	.read_alarm	= efi_read_alarm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	.set_alarm	= efi_set_alarm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	.proc		= efi_procfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static int __init efi_rtc_probe(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	struct rtc_device *rtc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	efi_time_t eft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	efi_time_cap_t cap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	/* First check if the RTC is usable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	if (efi.get_time(&eft, &cap) != EFI_SUCCESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	rtc = devm_rtc_device_register(&dev->dev, "rtc-efi", &efi_rtc_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 					THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if (IS_ERR(rtc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		return PTR_ERR(rtc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	rtc->uie_unsupported = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	platform_set_drvdata(dev, rtc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static struct platform_driver efi_rtc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		.name = "rtc-efi",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) module_platform_driver_probe(efi_rtc_driver, efi_rtc_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) MODULE_ALIAS("platform:rtc-efi");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) MODULE_AUTHOR("dann frazier <dannf@dannf.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) MODULE_DESCRIPTION("EFI RTC driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) MODULE_ALIAS("platform:rtc-efi");