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/**
* @file
*
* @brief GPIO NXP PCA9535 Driver Implementation
*
* @ingroup I2CGPIONXPPCA9535
*/
/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <dev/i2c/gpio-nxp-pca9535.h>
typedef enum {
GPIO_NXP_PCA9535_INPUT_PORT_0,
GPIO_NXP_PCA9535_INPUT_PORT_1,
GPIO_NXP_PCA9535_OUTPUT_PORT_0,
GPIO_NXP_PCA9535_OUTPUT_PORT_1,
GPIO_NXP_PCA9535_POL_INV_PORT_0,
GPIO_NXP_PCA9535_POL_INV_PORT_1,
GPIO_NXP_PCA9535_CONF_PORT_0,
GPIO_NXP_PCA9535_CONF_PORT_1
} gpio_nxp_pca9535_port;
static int gpio_nxp_pca9535_get_reg(
i2c_dev *dev,
gpio_nxp_pca9535_port port,
uint16_t *val
)
{
uint8_t out[1] = { port };
uint8_t in[sizeof(*val)];
i2c_msg msgs[2] = {
{
.addr = dev->address,
.flags = 0,
.len = (uint16_t) sizeof(out),
.buf = &out[0]
}, {
.addr = dev->address,
.flags = I2C_M_RD,
.len = (uint16_t) sizeof(in),
.buf = &in[0]
}
};
int err;
err = i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs));
*val = in[0] | (in[1] << 8);
return err;
}
static int gpio_nxp_pca9535_set_reg(
i2c_dev *dev,
gpio_nxp_pca9535_port port,
uint16_t val
)
{
uint8_t out[3] = { port, (uint8_t) val, (uint8_t) (val >> 8) };
i2c_msg msgs[1] = {
{
.addr = dev->address,
.flags = 0,
.len = (uint16_t) sizeof(out),
.buf = &out[0]
}
};
return i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs));
}
static int gpio_nxp_pca9535_ioctl(
i2c_dev *dev,
ioctl_command_t command,
void *arg
)
{
uint16_t v16 = (uint16_t)(uintptr_t) arg;
uint32_t v32 = (uint32_t)(uintptr_t) arg;
int err;
switch (command) {
case GPIO_NXP_PCA9535_GET_INPUT:
err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_INPUT_PORT_0, arg);
break;
case GPIO_NXP_PCA9535_GET_OUTPUT:
err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, arg);
break;
case GPIO_NXP_PCA9535_CLEAR_AND_SET_OUTPUT:
i2c_bus_obtain(dev->bus);
err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, &v16);
if (err == 0) {
v16 &= ~((uint16_t) v32);
v16 |= (uint16_t) (v32 >> 16);
err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, v16);
}
i2c_bus_release(dev->bus);
break;
case GPIO_NXP_PCA9535_SET_OUTPUT:
err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, v16);
break;
case GPIO_NXP_PCA9535_GET_POL_INV:
err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_POL_INV_PORT_0, arg);
break;
case GPIO_NXP_PCA9535_SET_POL_INV:
err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_POL_INV_PORT_0, v16);
break;
case GPIO_NXP_PCA9535_GET_CONFIG:
err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_CONF_PORT_0, arg);
break;
case GPIO_NXP_PCA9535_SET_CONFIG:
err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_CONF_PORT_0, v16);
break;
default:
err = -ENOTTY;
break;
}
return err;
}
int i2c_dev_register_gpio_nxp_pca9535(
const char *bus_path,
const char *dev_path,
uint16_t address
)
{
i2c_dev *dev;
dev = i2c_dev_alloc_and_init(sizeof(*dev), bus_path, address);
if (dev == NULL) {
return -1;
}
dev->ioctl = gpio_nxp_pca9535_ioctl;
return i2c_dev_register(dev, dev_path);
}
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