On Thu, 8 Jan 2009 17:56:45 -0700 dann frazier <dannf@xxxxxx> wrote: a few comments below. please also check http://groups.google.com/group/rtc-linux/web/checklist > Munge Stephane Eranian's efirtc.c code into an rtc platform driver > > Signed-off-by: dann frazier <dannf@xxxxxx> > --- > arch/ia64/kernel/time.c | 18 +++ > drivers/rtc/Kconfig | 10 ++ > drivers/rtc/Makefile | 1 + > drivers/rtc/rtc-efi.c | 294 +++++++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 323 insertions(+), 0 deletions(-) > create mode 100644 drivers/rtc/rtc-efi.c > > diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c > index f0ebb34..9ed5ba0 100644 > --- a/arch/ia64/kernel/time.c > +++ b/arch/ia64/kernel/time.c > @@ -20,6 +20,7 @@ > #include <linux/efi.h> > #include <linux/timex.h> > #include <linux/clocksource.h> > +#include <linux/platform_device.h> > > #include <asm/machvec.h> > #include <asm/delay.h> > @@ -405,6 +406,23 @@ static struct irqaction timer_irqaction = { > .name = "timer" > }; > > +struct platform_device rtc_efi_dev = { > + .name = "rtc-efi", > + .id = -1, > +}; > + > +static int __init rtc_init(void) > +{ > + int ret; > + ret = platform_device_register(&rtc_efi_dev); > + if (ret < 0) > + printk(KERN_ERR "unable to register rtc device...\n"); > + > + /* not necessarily an error */ > + return 0; > +} > +module_init(rtc_init); > + > void __init > time_init (void) > { > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig > index 165a818..37ce842 100644 > --- a/drivers/rtc/Kconfig > +++ b/drivers/rtc/Kconfig > @@ -433,6 +433,16 @@ config RTC_DRV_DS1742 > This driver can also be built as a module. If so, the module > will be called rtc-ds1742. > > +config RTC_DRV_EFI > + tristate "EFI RTC" > + depends on IA64 > + help > + If you say yes here you will get support for the EFI > + Real Time Clock. > + > + This driver can also be built as a module. If so, the module > + will be called rtc-efi. > + > config RTC_DRV_STK17TA8 > tristate "Simtek STK17TA8" > depends on RTC_CLASS > diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile > index 6e79c91..29db401 100644 > --- a/drivers/rtc/Makefile > +++ b/drivers/rtc/Makefile > @@ -34,6 +34,7 @@ obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o > obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o > obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o > obj-$(CONFIG_RTC_DRV_DS3234) += rtc-ds3234.o > +obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o > obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o > obj-$(CONFIG_RTC_DRV_FM3130) += rtc-fm3130.o > obj-$(CONFIG_RTC_DRV_ISL1208) += rtc-isl1208.o > diff --git a/drivers/rtc/rtc-efi.c b/drivers/rtc/rtc-efi.c > new file mode 100644 > index 0000000..2386da0 > --- /dev/null > +++ b/drivers/rtc/rtc-efi.c > @@ -0,0 +1,294 @@ > +/* > + * rtc-efi: RTC Class Driver for EFI-based systems > + * > + * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. > + * > + * Author: dann frazier <dannf@xxxxxx> > + * Based on efirtc.c by Stephane Eranian > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License as published by the > + * Free Software Foundation; either version 2 of the License, or (at your > + * option) any later version. > + * > + */ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/time.h> > +#include <linux/platform_device.h> > + > +#include <linux/efi.h> > + > +#define EFI_ISDST (EFI_TIME_ADJUST_DAYLIGHT|EFI_TIME_IN_DAYLIGHT) > +/* > + * EFI Epoch is 1/1/1998 > + */ > +#define EFI_RTC_EPOCH 1998 > + > +#define is_leap(year) \ > + ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) > + > +struct efi_rtc { > + struct rtc_device *rtc; > + spinlock_t lock; > +}; > + > +static const unsigned short int __mon_yday[2][13] = > +{ > + /* Normal years. */ > + { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, > + /* Leap years. */ > + { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } > +}; please check drivers/rtc/rtc-lib.c > +/* > + * returns day of the year [0-365] > + */ > +static inline int > +compute_yday(efi_time_t *eft) > +{ > + /* efi_time_t.month is in the [1-12] so, we need -1 */ > + return __mon_yday[is_leap(eft->year)][eft->month-1] + eft->day - 1; > +} > +/* > + * returns day of the week [0-6] 0=Sunday > + * > + * Don't try to provide a year that's before 1998, please ! > + */ > +static int > +compute_wday(efi_time_t *eft) > +{ > + int y; > + int ndays = 0; > + > + if (eft->year < 1998) { > + printk(KERN_ERR "efirtc: EFI year < 1998, invalid date\n"); > + return -1; > + } > + > + for (y = EFI_RTC_EPOCH; y < eft->year; y++) > + ndays += 365 + (is_leap(y) ? 1 : 0); > + > + ndays += compute_yday(eft); > + > + /* > + * 4=1/1/1998 was a Thursday > + */ > + return (ndays + 4) % 7; > +} > + > +static void > +convert_to_efi_time(struct rtc_time *wtime, efi_time_t *eft) > +{ > + > + eft->year = wtime->tm_year + 1900; > + eft->month = wtime->tm_mon + 1; > + eft->day = wtime->tm_mday; > + eft->hour = wtime->tm_hour; > + eft->minute = wtime->tm_min; > + eft->second = wtime->tm_sec; > + eft->nanosecond = 0; > + eft->daylight = wtime->tm_isdst ? EFI_ISDST : 0; > + eft->timezone = EFI_UNSPECIFIED_TIMEZONE; > +} > + > +static void > +convert_from_efi_time(efi_time_t *eft, struct rtc_time *wtime) > +{ > + memset(wtime, 0, sizeof(*wtime)); > + wtime->tm_sec = eft->second; > + wtime->tm_min = eft->minute; > + wtime->tm_hour = eft->hour; > + wtime->tm_mday = eft->day; > + wtime->tm_mon = eft->month - 1; > + wtime->tm_year = eft->year - 1900; > + > + /* day of the week [0-6], Sunday=0 */ > + wtime->tm_wday = compute_wday(eft); > + > + /* day in the year [1-365]*/ > + wtime->tm_yday = compute_yday(eft); > + > + > + switch (eft->daylight & EFI_ISDST) { > + case EFI_ISDST: > + wtime->tm_isdst = 1; > + break; > + case EFI_TIME_ADJUST_DAYLIGHT: > + wtime->tm_isdst = 0; > + break; > + default: > + wtime->tm_isdst = -1; > + } > +} > + > +static int efi_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) > +{ > + struct efi_rtc *p = dev_get_drvdata(dev); > + efi_time_t eft; > + efi_status_t status; > + unsigned long flags; > + > + lock_kernel(); > + > + spin_lock_irqsave(&p->lock, flags); you don't need your own lock, the rtc subsystem provides ops locking. > + /* > + * As of EFI v1.10, this call always returns an unsupported status > + */ > + status = efi.get_wakeup_time((efi_bool_t *)&wkalrm->enabled, > + (efi_bool_t *)&wkalrm->pending, &eft); > + spin_unlock_irqrestore(&p->lock, flags); > + > + unlock_kernel(); > + > + if (status != EFI_SUCCESS) > + return -EINVAL; > + > + convert_from_efi_time(&eft, &wkalrm->time); > + > + return 0; use return rtc_valid_tm > +} > + > +static int efi_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) > +{ > + struct efi_rtc *p = dev_get_drvdata(dev); > + efi_time_t eft; > + efi_status_t status; > + unsigned long flags; > + > + convert_to_efi_time(&wkalrm->time, &eft); > + > + lock_kernel(); > + > + spin_lock_irqsave(&p->lock, flags); > + /* > + * XXX Fixme: > + * As of EFI 0.92 with the firmware I have on my > + * machine this call does not seem to work quite > + * right > + * > + * As of v1.10, this call always returns an unsupported status > + */ > + status = efi.set_wakeup_time((efi_bool_t)wkalrm->enabled, &eft); > + spin_unlock_irqrestore(&p->lock, flags); > + > + unlock_kernel(); > + > + printk(KERN_WARNING "write status is %d\n", (int)status); > + > + return status == EFI_SUCCESS ? 0 : -EINVAL; > +} > + > +static int efi_read_time(struct device *dev, struct rtc_time *tm) > +{ > + struct efi_rtc *p = dev_get_drvdata(dev); > + unsigned long flags; > + efi_status_t status; > + efi_time_t eft; > + efi_time_cap_t cap; > + > + lock_kernel(); > + > + spin_lock_irqsave(&p->lock, flags); > + status = efi.get_time(&eft, &cap); > + spin_unlock_irqrestore(&p->lock, flags); > + > + unlock_kernel(); > + > + if (status != EFI_SUCCESS) { > + /* should never happen */ > + printk(KERN_ERR "efitime: can't read time\n"); > + return -EINVAL; > + } > + > + convert_from_efi_time(&eft, tm); > + > + return 0; use rtc_valid_tm > +} > + > +static int efi_set_time(struct device *dev, struct rtc_time *tm) > +{ > + struct efi_rtc *p = dev_get_drvdata(dev); > + unsigned long flags; > + efi_status_t status; > + efi_time_t eft; > + > + convert_to_efi_time(tm, &eft); > + > + lock_kernel(); > + > + spin_lock_irqsave(&p->lock, flags); > + status = efi.set_time(&eft); > + spin_unlock_irqrestore(&p->lock, flags); > + > + unlock_kernel(); > + > + return status == EFI_SUCCESS ? 0 : -EINVAL; > +} > + > +static const struct rtc_class_ops efi_rtc_ops = { > + .read_time = efi_read_time, > + .set_time = efi_set_time, > + .read_alarm = efi_read_alarm, > + .set_alarm = efi_set_alarm, > +}; > + > +static int __devinit efi_rtc_probe(struct platform_device *dev) > +{ > + struct efi_rtc *p; > + > + p = kzalloc(sizeof (*p), GFP_KERNEL); > + if (!p) > + return -ENOMEM; > + > + spin_lock_init(&p->lock); > + > + p->rtc = rtc_device_register("rtc-efi", &dev->dev, &efi_rtc_ops, > + THIS_MODULE); > + if (IS_ERR(p->rtc)) { > + int err = PTR_ERR(p->rtc); > + kfree(p); > + return err; > + } > + > + platform_set_drvdata(dev, p); > + > + return 0; > +} > + > +static int __devexit efi_rtc_remove(struct platform_device *dev) > +{ > + struct efi_rtc *p = platform_get_drvdata(dev); > + > + rtc_device_unregister(p->rtc); > + kfree(p); > + > + return 0; > +} > + > +static struct platform_driver efi_rtc_driver = { > + .driver = { > + .name = "rtc-efi", > + .owner = THIS_MODULE, > + }, > + .probe = efi_rtc_probe, > + .remove = __devexit_p(efi_rtc_remove), > +}; > + > +static int __init efi_rtc_init(void) > +{ > + return platform_driver_register(&efi_rtc_driver); you can probably use platform_driver_probe > +} > + > +static void __exit efi_rtc_exit(void) > +{ > + platform_driver_unregister(&efi_rtc_driver); > +} > + > +module_init(efi_rtc_init); > +module_exit(efi_rtc_exit); > + > +MODULE_AUTHOR("dann frazier <dannf@xxxxxx>"); > +MODULE_LICENSE("GPL"); > +MODULE_DESCRIPTION("EFI RTC driver"); > -- > 1.5.6.5 > > > --~--~---------~--~----~------------~-------~--~----~ > You received this message because you are subscribed to "rtc-linux". > Membership options at http://groups.google.com/group/rtc-linux . > Please read http://groups.google.com/group/rtc-linux/web/checklist > before submitting a driver. > -~----------~----~----~----~------~----~------~--~--- > -- Best regards, Alessandro Zummo, Tower Technologies - Torino, Italy http://www.towertech.it -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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