kernel-ark/drivers/input/misc/ad714x.h
Michael Hennerich 9eff794b77 Input: ad714x - read the interrupt status registers in a row
The interrupt status registers should be read in row to avoid invalid data.

Alter "read" method for both bus options to allow reading several registers
in a row and make sure we read interrupt status registers properly.

Read sequence saves 50% of bus transactions compared to single register
reads. So use it also for the result registers, which are also located
in a row.

Also update copyright notice.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2011-08-22 09:59:26 -07:00

56 lines
1.2 KiB
C

/*
* AD714X CapTouch Programmable Controller driver (bus interfaces)
*
* Copyright 2009-2011 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef _AD714X_H_
#define _AD714X_H_
#include <linux/types.h>
#define STAGE_NUM 12
struct device;
struct ad714x_platform_data;
struct ad714x_driver_data;
struct ad714x_chip;
typedef int (*ad714x_read_t)(struct ad714x_chip *, unsigned short, unsigned short *, size_t);
typedef int (*ad714x_write_t)(struct ad714x_chip *, unsigned short, unsigned short);
struct ad714x_chip {
unsigned short l_state;
unsigned short h_state;
unsigned short c_state;
unsigned short adc_reg[STAGE_NUM];
unsigned short amb_reg[STAGE_NUM];
unsigned short sensor_val[STAGE_NUM];
struct ad714x_platform_data *hw;
struct ad714x_driver_data *sw;
int irq;
struct device *dev;
ad714x_read_t read;
ad714x_write_t write;
struct mutex mutex;
unsigned product;
unsigned version;
__be16 xfer_buf[16] ____cacheline_aligned;
};
int ad714x_disable(struct ad714x_chip *ad714x);
int ad714x_enable(struct ad714x_chip *ad714x);
struct ad714x_chip *ad714x_probe(struct device *dev, u16 bus_type, int irq,
ad714x_read_t read, ad714x_write_t write);
void ad714x_remove(struct ad714x_chip *ad714x);
#endif