From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-la0-x233.google.com ([2a00:1450:4010:c03::233]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1X59nc-0001Ec-AM for barebox@lists.infradead.org; Thu, 10 Jul 2014 08:33:53 +0000 Received: by mail-la0-f51.google.com with SMTP id mc6so5734297lab.24 for ; Thu, 10 Jul 2014 01:33:29 -0700 (PDT) From: Antony Pavlov Date: Thu, 10 Jul 2014 12:33:16 +0400 Message-Id: <1404981199-21293-3-git-send-email-antonynpavlov@gmail.com> In-Reply-To: <1404981199-21293-1-git-send-email-antonynpavlov@gmail.com> References: <1404981199-21293-1-git-send-email-antonynpavlov@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [RFC 2/5] add rtc support To: barebox@lists.infradead.org Signed-off-by: Antony Pavlov --- drivers/Kconfig | 1 + drivers/Makefile | 1 + drivers/rtc/Kconfig | 16 +++++++++++++ drivers/rtc/Makefile | 6 +++++ drivers/rtc/class.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++ drivers/rtc/rtc-lib.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/rtc.h | 46 ++++++++++++++++++++++++++++++++++++ include/rtc.h | 2 ++ 8 files changed, 198 insertions(+) diff --git a/drivers/Kconfig b/drivers/Kconfig index 12a9d8c..d38032c 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -28,5 +28,6 @@ source "drivers/bus/Kconfig" source "drivers/regulator/Kconfig" source "drivers/reset/Kconfig" source "drivers/pci/Kconfig" +source "drivers/rtc/Kconfig" endmenu diff --git a/drivers/Makefile b/drivers/Makefile index 1990e86..4591f9a 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -27,3 +27,4 @@ obj-y += bus/ obj-$(CONFIG_REGULATOR) += regulator/ obj-$(CONFIG_RESET_CONTROLLER) += reset/ obj-$(CONFIG_PCI) += pci/ +obj-y += rtc/ diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig new file mode 100644 index 0000000..f148266 --- /dev/null +++ b/drivers/rtc/Kconfig @@ -0,0 +1,16 @@ +# +# RTC class/drivers configuration +# + +config RTC_LIB + bool + +menuconfig RTC_CLASS + bool "Real Time Clock" + default n + depends on !S390 && !UML + select RTC_LIB + help + Generic RTC class support. If you say yes here, you will + be allowed to plug one or more RTCs to your system. You will + probably want to enable one or more of the interfaces below. diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile new file mode 100644 index 0000000..7d1b5bc --- /dev/null +++ b/drivers/rtc/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for RTC class/drivers. +# + +obj-$(CONFIG_RTC_LIB) += rtc-lib.o +obj-$(CONFIG_RTC_CLASS) += class.o diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c new file mode 100644 index 0000000..b808f3d --- /dev/null +++ b/drivers/rtc/class.c @@ -0,0 +1,62 @@ +#include +#include +#include + +LIST_HEAD(rtc_list); +EXPORT_SYMBOL(rtc_list); + +struct rtc_device *rtc_lookup(const char *name) +{ + struct rtc_device *r; + + if (!name) + return ERR_PTR(-ENODEV); + + list_for_each_entry(r, &rtc_list, list) { + if (!strcmp(dev_name(&r->class_dev), name)) + return r; + } + + return ERR_PTR(-ENODEV); +} +EXPORT_SYMBOL(rtc_lookup); + +int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm) +{ + return rtc->ops->read_time(rtc, tm); +} +EXPORT_SYMBOL(rtc_read_time); + +int rtc_register(struct rtc_device *rtcdev) +{ + struct device_d *dev = &rtcdev->class_dev; + + dev->id = DEVICE_ID_DYNAMIC; + strcpy(dev->name, "rtc"); + if (rtcdev->dev) + dev->parent = rtcdev->dev; + platform_device_register(dev); + + list_add_tail(&rtcdev->list, &rtc_list); + + return 0; +} +EXPORT_SYMBOL(rtc_register); + +#if 0 +int rtc_unregister(struct rtc_device *cdev) +{ + struct device_d *dev = &cdev->class_dev; + int status; + + list_del(&cdev->list); + if (list_empty(&rtc_list)) + initialized = CONSOLE_UNINITIALIZED; + + status = unregister_device(dev); + if (!status) + memset(cdev, 0, sizeof(*cdev)); + return status; +} +EXPORT_SYMBOL(rtc_unregister); +#endif diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c new file mode 100644 index 0000000..44c0a06 --- /dev/null +++ b/drivers/rtc/rtc-lib.c @@ -0,0 +1,64 @@ +/* + * rtc and date/time utility functions + * + * Copyright (C) 2005-06 Tower Technologies + * Author: Alessandro Zummo + * + * based on arch/arm/common/rtctime.c and other bits + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#include +#include + +static const unsigned char rtc_days_in_month[] = { + 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 +}; + +static const unsigned short rtc_ydays[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 } +}; + +#define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400) + +/* + * The number of days in the month. + */ +int rtc_month_days(unsigned int month, unsigned int year) +{ + return rtc_days_in_month[month] + (is_leap_year(year) && month == 1); +} +EXPORT_SYMBOL(rtc_month_days); + +/* + * The number of days since January 1. (0 to 365) + */ +int rtc_year_days(unsigned int day, unsigned int month, unsigned int year) +{ + return rtc_ydays[is_leap_year(year)][month] + day-1; +} +EXPORT_SYMBOL(rtc_year_days); + +/* + * Does the rtc_time represent a valid date/time? + */ +int rtc_valid_tm(struct rtc_time *tm) +{ + if (tm->tm_year < 70 + || ((unsigned)tm->tm_mon) >= 12 + || tm->tm_mday < 1 + || tm->tm_mday > rtc_month_days(tm->tm_mon, tm->tm_year + 1900) + || ((unsigned)tm->tm_hour) >= 24 + || ((unsigned)tm->tm_min) >= 60 + || ((unsigned)tm->tm_sec) >= 60) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(rtc_valid_tm); diff --git a/include/linux/rtc.h b/include/linux/rtc.h new file mode 100644 index 0000000..fc94a57 --- /dev/null +++ b/include/linux/rtc.h @@ -0,0 +1,46 @@ +/* + * Generic RTC interface. + * This version contains the part of the user interface to the Real Time Clock + * service. It is used with both the legacy mc146818 and also EFI + * Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out + * from to this file for 2.4 kernels. + * + * Copyright (C) 1999 Hewlett-Packard Co. + * Copyright (C) 1999 Stephane Eranian + */ +#ifndef _LINUX_RTC_H_ +#define _LINUX_RTC_H_ + +#include +#include + +extern int rtc_month_days(unsigned int month, unsigned int year); +extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year); +extern int rtc_valid_tm(struct rtc_time *tm); + +struct rtc_class_ops; + +struct rtc_device { + struct device_d *dev; + struct device_d class_dev; + struct list_head list; + + const struct rtc_class_ops *ops; +}; + +struct rtc_class_ops { + int (*read_time)(struct rtc_device *, struct rtc_time *); + int (*set_time)(struct rtc_device *, struct rtc_time *); +}; + +extern int rtc_register(struct rtc_device *rtcdev); + +extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm); +extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm); + +static inline bool is_leap_year(unsigned int year) +{ + return (!(year % 4) && (year % 100)) || !(year % 400); +} + +#endif /* _LINUX_RTC_H_ */ diff --git a/include/rtc.h b/include/rtc.h index c2d8bce..e2414fb 100644 --- a/include/rtc.h +++ b/include/rtc.h @@ -53,4 +53,6 @@ void to_tm (int, struct rtc_time *); unsigned long mktime (unsigned int, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int); +extern struct rtc_device *rtc_lookup(const char *name); + #endif /* _RTC_H_ */ -- 2.0.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox