pca9538.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#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         = noop_read_resources,
        .set_resources          = noop_set_resources,
        .init                   = pca9538_init,
};
 
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
};