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Add support for PCA953x I2C gpio devices

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Initial support for NXP's 4 and 8 bit I2C gpio expanders
(eg pca9537, pca9557, etc). The CONFIG_PCA953X define
enables support for the devices while the CONFIG_CMD_PCA953X
define enables the pca953x command. The CONFIG_CMD_PCA953X_INFO
define enables an 'info' sub-command which provides summary
information for the given pca953x device.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
This commit is contained in:
Peter Tyser
2008-12-17 16:36:21 -06:00
committed by Andrew Fleming-AFLEMING
parent 7a89795911
commit e92739d34e
5 changed files with 324 additions and 0 deletions
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39
include/pca953x.h Normal file
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/*
* Copyright 2008 Extreme Engineering Solutions, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef __PCA953X_H_
#define __PCA953X_H_
#define PCA953X_IN 0x00
#define PCA953X_OUT 0x01
#define PCA953X_POL 0x02
#define PCA953X_CONF 0x03
#define PCA953X_OUT_LOW 0
#define PCA953X_OUT_HIGH 1
#define PCA953X_POL_NORMAL 0
#define PCA953X_POL_INVERT 1
#define PCA953X_DIR_OUT 0
#define PCA953X_DIR_IN 1
int pca953x_set_val(u8 chip, uint mask, uint data);
int pca953x_set_pol(u8 chip, uint mask, uint data);
int pca953x_set_dir(u8 chip, uint mask, uint data);
int pca953x_get_val(u8 chip);
#endif /* __PCA953X_H_ */