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| author | Wolfram Sang <w.sang@pengutronix.de> | 2010-03-05 13:44:33 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-06 11:26:48 -0800 |
| commit | e952805d2d2e706aed182723e5ab3ec0b1f91de3 (patch) | |
| tree | 5b4f9bfff6798f44fdea7c891ee911af2df5357b /include/linux/spi/max7301.h | |
| parent | 5a98c04d78c896d52baef20ffc11f6d1ba6eb786 (diff) | |
| download | lwn-e952805d2d2e706aed182723e5ab3ec0b1f91de3.tar.gz lwn-e952805d2d2e706aed182723e5ab3ec0b1f91de3.zip | |
gpio: add driver for MAX7300 I2C GPIO extender
Add the MAX7300-I2C variant of the MAX7301-SPI version. Both chips share
the same core logic, so the generic part of the in-kernel SPI-driver is
refactored into a generic part. The I2C and SPI specific funtions are
then wrapped into seperate drivers picking up the generic part.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: Juergen Beisert <j.beisert@pengutronix.de>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/spi/max7301.h')
| -rw-r--r-- | include/linux/spi/max7301.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/spi/max7301.h b/include/linux/spi/max7301.h index 6dfd83f19b4b..34af0a3477bf 100644 --- a/include/linux/spi/max7301.h +++ b/include/linux/spi/max7301.h @@ -1,9 +1,27 @@ #ifndef LINUX_SPI_MAX7301_H #define LINUX_SPI_MAX7301_H +#include <linux/gpio.h> + +/* + * Some registers must be read back to modify. + * To save time we cache them here in memory + */ +struct max7301 { + struct mutex lock; + u8 port_config[8]; /* field 0 is unused */ + u32 out_level; /* cached output levels */ + struct gpio_chip chip; + struct device *dev; + int (*write)(struct device *dev, unsigned int reg, unsigned int val); + int (*read)(struct device *dev, unsigned int reg); +}; + struct max7301_platform_data { /* number assigned to the first GPIO */ unsigned base; }; +extern int __max730x_remove(struct device *dev); +extern int __max730x_probe(struct max7301 *ts); #endif |