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/**
* @file
*
* @brief I2C Driver for SEMTECH SC620 Octal LED Driver
*/
/*
* Copyright (c) 2013 embedded brains GmbH. All rights reserved.
*
* 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.
*/
#include <libchip/i2c-sc620.h>
#include <rtems/libio.h>
#define SC620_REG_COUNT 10
static rtems_status_code i2c_sc620_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code sc = RTEMS_IO_ERROR;
rtems_libio_rw_args_t *rw = arg;
unsigned char *buf = (unsigned char *) &rw->buffer[0];
if (rw->count == 2 && buf[0] < SC620_REG_COUNT) {
int rv;
rv = rtems_libi2c_start_write_bytes(
minor, buf, 2
);
if (rv == 2) {
sc = rtems_libi2c_send_stop(minor);
}
}
rw->bytes_moved = sc == RTEMS_SUCCESSFUL ? 2 : 0;
return sc;
}
static rtems_status_code i2c_sc620_read(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code sc = RTEMS_IO_ERROR;
rtems_libio_rw_args_t *rw = arg;
unsigned char *buf = (unsigned char *) &rw->buffer[0];
if (rw->count == 1 && buf[0] < SC620_REG_COUNT) {
int rv;
rv = rtems_libi2c_start_write_bytes(minor, buf, 1);
if (rv == 1) {
sc = rtems_libi2c_send_addr(minor, 0);
if (sc == RTEMS_SUCCESSFUL) {
rv = rtems_libi2c_read_bytes(minor, buf, 1);
if (rv == 1) {
sc = rtems_libi2c_send_stop(minor);
}
}
}
}
rw->bytes_moved = sc == RTEMS_SUCCESSFUL ? 1 : 0;
return sc;
}
static rtems_driver_address_table i2c_sc620_ops = {
.read_entry = i2c_sc620_read,
.write_entry = i2c_sc620_write
};
rtems_libi2c_drv_t i2c_sc620_driver = {
.ops = &i2c_sc620_ops,
.size = sizeof(i2c_sc620_driver)
};
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