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authorWolfram Sang <w.sang@pengutronix.de>2010-03-05 13:44:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-06 11:26:48 -0800
commite952805d2d2e706aed182723e5ab3ec0b1f91de3 (patch)
tree5b4f9bfff6798f44fdea7c891ee911af2df5357b /include
parent5a98c04d78c896d52baef20ffc11f6d1ba6eb786 (diff)
downloadblackbird-op-linux-e952805d2d2e706aed182723e5ab3ec0b1f91de3.tar.gz
blackbird-op-linux-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')
-rw-r--r--include/linux/spi/max7301.h18
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
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