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4a22b8a4ad
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>
36 lines
900 B
C
36 lines
900 B
C
#ifndef LINUX_SPI_MAX7301_H
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#define LINUX_SPI_MAX7301_H
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#include <linux/gpio.h>
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/*
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* Some registers must be read back to modify.
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* To save time we cache them here in memory
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*/
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struct max7301 {
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struct mutex lock;
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u8 port_config[8]; /* field 0 is unused */
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u32 out_level; /* cached output levels */
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u32 input_pullup_active;
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struct gpio_chip chip;
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struct device *dev;
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int (*write)(struct device *dev, unsigned int reg, unsigned int val);
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int (*read)(struct device *dev, unsigned int reg);
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};
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struct max7301_platform_data {
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/* number assigned to the first GPIO */
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unsigned base;
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/*
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* bitmask controlling the pullup configuration,
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*
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* _note_ the 4 lowest bits are unused, because the first 4
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* ports of the controller are not used, too.
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*/
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u32 input_pullup_active;
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};
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extern int __max730x_remove(struct device *dev);
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extern int __max730x_probe(struct max7301 *ts);
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#endif
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