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gpio: max730x: make pullups configurable via platformdata

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The gpios on the max730x chips have support for internal pullups while in
input mode.

This patch adds support for configuring these pullups via platform data.
A new member ("input_pullup_active") to the platform data struct is
introduced.  A set bit in this variable activates the pullups while the
respective port is in input mode.  This is a compatible enhancement since
unset bits lead to disables pullups which was the default in the original
driver.

_Note_: the 4 lowest bits in "input_pullup_active" are unused because the
first 4 ports of the controller are not used, too.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Marc Kleine-Budde
2010-08-10 18:02:23 -07:00
committed by Linus Torvalds
parent 22e3d63147
commit 4a22b8a4ad
2 changed files with 23 additions and 7 deletions
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8
include/linux/spi/max7301.h
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@@ -11,6 +11,7 @@ struct max7301 {
struct mutex lock;
u8 port_config[8]; /* field 0 is unused */
u32 out_level; /* cached output levels */
u32 input_pullup_active;
struct gpio_chip chip;
struct device *dev;
int (*write)(struct device *dev, unsigned int reg, unsigned int val);
@@ -20,6 +21,13 @@ struct max7301 {
struct max7301_platform_data {
/* number assigned to the first GPIO */
unsigned base;
/*
* bitmask controlling the pullup configuration,
*
* _note_ the 4 lowest bits are unused, because the first 4
* ports of the controller are not used, too.
*/
u32 input_pullup_active;
};
extern int __max730x_remove(struct device *dev);