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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2018 Siemens AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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.
*/
#include <device/i2c_bus.h>
#include <device/device.h>
#include "pca9538.h"
#include "chip.h"
/* This function can be used from outside the chip driver to read input. */
uint8_t pca9538_read_input(void)
{
struct device *dev = pca9538_get_dev();
if (!dev)
return 0;
else
return (uint8_t)(i2c_dev_readb_at(dev, INPUT_REG));
}
/* This function can be used from outside the chip driver to set output. */
void pca9538_set_output(uint8_t val)
{
struct device *dev = pca9538_get_dev();
if (dev)
i2c_dev_writeb_at(dev, OUTPUT_REG, val);
}
static void pca9538_init(struct device *dev)
{
struct drivers_i2c_pca9538_config *config = dev->chip_info;
if (!config)
return;
/* Set up registers as requested in devicetree. */
i2c_dev_writeb_at(dev, INPUT_INVERT_REG, config->invert);
i2c_dev_writeb_at(dev, OUTPUT_REG, config->out_val);
i2c_dev_writeb_at(dev, IO_CONFIG_REG, config->in_out);
}
static struct device_operations pca9538_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
.init = pca9538_init,
.final = DEVICE_NOOP
};
static void pca9538_enable(struct device *dev)
{
dev->ops = &pca9538_ops;
}
struct chip_operations drivers_i2c_pca9538_ops = {
CHIP_NAME("PCA9538")
.enable_dev = pca9538_enable
};
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