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gpio: add driver for MAX7300 I2C GPIO extender

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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>
This commit is contained in:
Wolfram Sang
2010-03-05 13:44:33 -08:00
committed by Linus Torvalds
parent 5a98c04d78
commit e952805d2d
6 changed files with 404 additions and 260 deletions
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18
include/linux/spi/max7301.h
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@@ -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