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53e84b672c
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: David Brownell <dbrownell@users.sourceforge.net> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
#ifndef __LINUX_SPI_DS1305_H
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#define __LINUX_SPI_DS1305_H
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/*
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* One-time configuration for ds1305 and ds1306 RTC chips.
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*
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* Put a pointer to this in spi_board_info.platform_data if you want to
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* be sure that Linux (re)initializes this as needed ... after losing
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* backup power, and potentially on the first boot.
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*/
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struct ds1305_platform_data {
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/* Trickle charge configuration: it's OK to leave out the MAGIC
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* bitmask; mask in either DS1 or DS2, and then one of 2K/4k/8K.
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*/
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#define DS1305_TRICKLE_MAGIC 0xa0
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#define DS1305_TRICKLE_DS2 0x08 /* two diodes */
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#define DS1305_TRICKLE_DS1 0x04 /* one diode */
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#define DS1305_TRICKLE_2K 0x01 /* 2 KOhm resistance */
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#define DS1305_TRICKLE_4K 0x02 /* 4 KOhm resistance */
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#define DS1305_TRICKLE_8K 0x03 /* 8 KOhm resistance */
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u8 trickle;
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/* set only on ds1306 parts */
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bool is_ds1306;
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/* ds1306 only: enable 1 Hz output */
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bool en_1hz;
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/* REVISIT: the driver currently expects nINT0 to be wired
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* as the alarm IRQ. ALM1 may also need to be set up ...
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*/
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};
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#endif /* __LINUX_SPI_DS1305_H */
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