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Commit 53e84b67 authored by David Brownell's avatar David Brownell Committed by Linus Torvalds
Browse files

rtc: ds1305/ds1306 driver 



Support the Dallas/Maxim DS1305 and DS1306 RTC chips.  These use SPI, and
support alarms, NVRAM, and a trickle charger for use when their backup
power supply is a supercap or rechargeable cell.

This basic driver doesn't yet support suspend/resume or wakealarms.

Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8fc2c767

drivers/rtc/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -282,6 +282,16 @@ config RTC_DRV_M41T94 
	  This driver can also be built as a module. If so, the module

	  will be called rtc-m41t94.



config RTC_DRV_DS1305

	tristate "Dallas/Maxim DS1305/DS1306"

	help

	  Select this driver to get support for the Dallas/Maxim DS1305

	  and DS1306 real time clock chips.  These support a trickle

	  charger, alarms, and NVRAM in addition to the clock.



	  This driver can also be built as a module. If so, the module

	  will be called rtc-ds1305.



config RTC_DRV_MAX6902

	tristate "Maxim MAX6902"

	help

drivers/rtc/Makefile

+1 −0
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@@ -24,6 +24,7 @@ obj-$(CONFIG_RTC_DRV_BFIN) += rtc-bfin.o 
obj-$(CONFIG_RTC_DRV_CMOS)	+= rtc-cmos.o

obj-$(CONFIG_RTC_DRV_DS1216)	+= rtc-ds1216.o

obj-$(CONFIG_RTC_DRV_DS1302)	+= rtc-ds1302.o

obj-$(CONFIG_RTC_DRV_DS1305)	+= rtc-ds1305.o

obj-$(CONFIG_RTC_DRV_DS1307)	+= rtc-ds1307.o

obj-$(CONFIG_RTC_DRV_DS1374)	+= rtc-ds1374.o

obj-$(CONFIG_RTC_DRV_DS1511)	+= rtc-ds1511.o

drivers/rtc/rtc-ds1305.c

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+847 −0

File added.

Preview size limit exceeded, changes collapsed.

include/linux/spi/ds1305.h

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#ifndef __LINUX_SPI_DS1305_H

#define __LINUX_SPI_DS1305_H



/*

 * One-time configuration for ds1305 and ds1306 RTC chips.

 *

 * Put a pointer to this in spi_board_info.platform_data if you want to

 * be sure that Linux (re)initializes this as needed ... after losing

 * backup power, and potentially on the first boot.

 */

struct ds1305_platform_data {



	/* Trickle charge configuration:  it's OK to leave out the MAGIC

	 * bitmask; mask in either DS1 or DS2, and then one of 2K/4k/8K.

	 */

#define DS1305_TRICKLE_MAGIC	0xa0

#define DS1305_TRICKLE_DS2	0x08	/* two diodes */

#define DS1305_TRICKLE_DS1	0x04	/* one diode */

#define DS1305_TRICKLE_2K	0x01	/* 2 KOhm resistance */

#define DS1305_TRICKLE_4K	0x02	/* 4 KOhm resistance */

#define DS1305_TRICKLE_8K	0x03	/* 8 KOhm resistance */

	u8	trickle;



	/* set only on ds1306 parts */

	bool	is_ds1306;



	/* ds1306 only:  enable 1 Hz output */

	bool	en_1hz;



	/* REVISIT:  the driver currently expects nINT0 to be wired

	 * as the alarm IRQ.  ALM1 may also need to be set up ...

	 */

};



#endif /* __LINUX_SPI_DS1305_H */