326 lines
7.9 KiB
Diff
326 lines
7.9 KiB
Diff
commit 5e3fd9e5810f141c9c70c36992d4ed72b3aa1fed
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Author: dann frazier <dannf@dannf.org>
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Date: Tue Mar 31 15:24:48 2009 -0700
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rtc: add platform driver for EFI
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Munge Stephane Eranian's efirtc.c code into an rtc platform driver
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[akpm@linux-foundation.org: use is_leap_year()]
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Signed-off-by: dann frazier <dannf@hp.com>
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Cc: Alessandro Zummo <alessandro.zummo@towertech.it>
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Cc: stephane eranian <eranian@googlemail.com>
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Cc: "Luck, Tony" <tony.luck@intel.com>
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Cc: David Brownell <david-b@pacbell.net>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
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index f0ebb34..d6747ba 100644
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--- a/arch/ia64/kernel/time.c
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+++ b/arch/ia64/kernel/time.c
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@@ -20,6 +20,7 @@
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#include <linux/efi.h>
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#include <linux/timex.h>
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#include <linux/clocksource.h>
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+#include <linux/platform_device.h>
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#include <asm/machvec.h>
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#include <asm/delay.h>
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@@ -405,6 +406,21 @@ static struct irqaction timer_irqaction = {
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.name = "timer"
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};
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+static struct platform_device rtc_efi_dev = {
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+ .name = "rtc-efi",
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+ .id = -1,
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+};
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+
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+static int __init rtc_init(void)
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+{
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+ if (platform_device_register(&rtc_efi_dev) < 0)
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+ printk(KERN_ERR "unable to register rtc device...\n");
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+
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+ /* not necessarily an error */
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+ return 0;
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+}
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+module_init(rtc_init);
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+
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void __init
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time_init (void)
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{
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diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
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index 81450fb..d669b91 100644
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--- a/drivers/rtc/Kconfig
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+++ b/drivers/rtc/Kconfig
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@@ -440,6 +440,16 @@ config RTC_DRV_DS1742
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1742.
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+config RTC_DRV_EFI
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+ tristate "EFI RTC"
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+ depends on IA64
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+ help
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+ If you say yes here you will get support for the EFI
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+ Real Time Clock.
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+
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+ This driver can also be built as a module. If so, the module
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+ will be called rtc-efi.
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+
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config RTC_DRV_STK17TA8
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tristate "Simtek STK17TA8"
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depends on RTC_CLASS
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diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
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index 0e697aa..e7b0998 100644
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--- a/drivers/rtc/Makefile
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+++ b/drivers/rtc/Makefile
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@@ -36,6 +36,7 @@ obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o
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obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o
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obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o
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obj-$(CONFIG_RTC_DRV_DS3234) += rtc-ds3234.o
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+obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o
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obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o
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obj-$(CONFIG_RTC_DRV_FM3130) += rtc-fm3130.o
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obj-$(CONFIG_RTC_DRV_ISL1208) += rtc-isl1208.o
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diff --git a/drivers/rtc/rtc-efi.c b/drivers/rtc/rtc-efi.c
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new file mode 100644
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index 0000000..5502923
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--- /dev/null
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+++ b/drivers/rtc/rtc-efi.c
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@@ -0,0 +1,235 @@
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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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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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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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+
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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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+/*
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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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+ return rtc_year_days(eft->day - 1, eft->month - 1, eft->year);
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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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+
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+ if (eft->year < 1998) {
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+ printk(KERN_ERR "efirtc: EFI year < 1998, invalid date\n");
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+ return -1;
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+ }
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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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+
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+ ndays += compute_yday(eft);
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+
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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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+
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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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+ eft->second = wtime->tm_sec;
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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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+
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+static void
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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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+ wtime->tm_sec = eft->second;
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+ wtime->tm_min = eft->minute;
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+ wtime->tm_hour = eft->hour;
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+ wtime->tm_mday = eft->day;
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+ wtime->tm_mon = eft->month - 1;
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+ wtime->tm_year = eft->year - 1900;
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+
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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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+
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+ /* day in the year [1-365]*/
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+ wtime->tm_yday = compute_yday(eft);
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+
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+
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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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+}
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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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+ /*
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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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+
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+ if (status != EFI_SUCCESS)
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+ return -EINVAL;
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+
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+ convert_from_efi_time(&eft, &wkalrm->time);
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+
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+ return rtc_valid_tm(&wkalrm->time);
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+}
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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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+
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+ convert_to_efi_time(&wkalrm->time, &eft);
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+
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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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+
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+ printk(KERN_WARNING "write status is %d\n", (int)status);
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+
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+ return status == EFI_SUCCESS ? 0 : -EINVAL;
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+}
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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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+
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+ status = efi.get_time(&eft, &cap);
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+
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+ if (status != EFI_SUCCESS) {
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+ /* should never happen */
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+ printk(KERN_ERR "efitime: can't read time\n");
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+ return -EINVAL;
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+ }
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+
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+ convert_from_efi_time(&eft, tm);
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+
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+ return rtc_valid_tm(tm);
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+}
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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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+
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+ convert_to_efi_time(tm, &eft);
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+
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+ status = efi.set_time(&eft);
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+
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+ return status == EFI_SUCCESS ? 0 : -EINVAL;
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+}
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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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+
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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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+
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+ rtc = rtc_device_register("rtc-efi", &dev->dev, &efi_rtc_ops,
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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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+
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+ platform_set_drvdata(dev, rtc);
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+
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+ return 0;
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+}
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+
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+static int __exit efi_rtc_remove(struct platform_device *dev)
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+{
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+ struct rtc_device *rtc = platform_get_drvdata(dev);
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+
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+ rtc_device_unregister(rtc);
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+
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+ return 0;
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+}
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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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+ .owner = THIS_MODULE,
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+ },
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+ .probe = efi_rtc_probe,
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+ .remove = __exit_p(efi_rtc_remove),
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+};
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+
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+static int __init efi_rtc_init(void)
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+{
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+ return platform_driver_probe(&efi_rtc_driver, efi_rtc_probe);
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+}
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+
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+static void __exit efi_rtc_exit(void)
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+{
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+ platform_driver_unregister(&efi_rtc_driver);
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+}
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+
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+module_init(efi_rtc_init);
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+module_exit(efi_rtc_exit);
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+
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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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