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Abraham van der Merwe
97d966fb75
provides and API for NVRAM and RTC drivers to sit on top of this. An example of drivers that uses this API are the Frodo RTC and NVRAM drivers. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1433 7894878c-1315-0410-8ee3-d5d059ff63e0
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#ifndef DS1307_H
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#define DS1307_H
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/*
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* linux/include/linux/ds1307.h
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*
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* Author: Abraham van der Merwe <abraham@2d3d.co.za>
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*
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* Linux support for the Dallas Semiconductor DS1307 Serial Real-Time
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* Clock.
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*
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* Based on code from the lm-sensors project which is available
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* at http://www.lm-sensors.nu/ and Russell King's PCF8583 Real-Time
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* Clock driver (linux/drivers/acorn/char/pcf8583.c).
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*
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* This source code is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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/* practically the same as struct rtc_time, but without tm_yday and tm_isdst */
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struct ds1307_date {
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int tm_sec;
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int tm_min;
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int tm_hour;
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int tm_mday;
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int tm_mon;
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int tm_year;
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int tm_wday;
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};
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struct ds1307_memory {
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u8 offset; /* 0 - 55 */
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u8 buf[56]; /* data */
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u8 length; /* offset + length <= 50 */
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};
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/* size of the rtc non-volatile ram */
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#define DS1307_SIZE 56
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/* the following frequencies are supported */
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#define DS1307_FREQ_1HZ 1
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#define DS1307_FREQ_4KHZ 4096
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#define DS1307_FREQ_8KHZ 8192
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#define DS1307_FREQ_32KHZ 32768
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#define DS1307_GET_DATE _IOR ('d',0,struct ds1307_date *)
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#define DS1307_SET_DATE _IOW ('d',1,struct ds1307_date *)
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#define DS1307_IRQ_ON _IO ('d',2)
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#define DS1307_IRQ_OFF _IO ('d',3)
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#define DS1307_GET_FREQ _IOR ('d',4,u16 *)
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#define DS1307_SET_FREQ _IOW ('d',5,u16 *)
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#define DS1307_READ _IOR ('d',6,struct ds1307_memory *)
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#define DS1307_WRITE _IOW ('d',7,struct ds1307_memory *)
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#define DS1307_ENABLE _IO ('d',8)
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#endif /* #ifdef DS1307_H */
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