mirror of
https://gitlab.rtems.org/rtems/rtos/rtems.git
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bc959e983f
Add "(void) param;" annotation to address unused parameter warnings. Found with GCC's warning -Wunused-parameter.
109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @brief I2C Driver for SEMTECH SC620 Octal LED Driver
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*/
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/*
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* Copyright (c) 2013 embedded brains GmbH & Co. KG
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <libchip/i2c-sc620.h>
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#include <rtems/libio.h>
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#define SC620_REG_COUNT 10
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static rtems_status_code i2c_sc620_write(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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(void) major;
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rtems_status_code sc = RTEMS_IO_ERROR;
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rtems_libio_rw_args_t *rw = arg;
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unsigned char *buf = (unsigned char *) &rw->buffer[0];
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if (rw->count == 2 && buf[0] < SC620_REG_COUNT) {
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int rv;
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rv = rtems_libi2c_start_write_bytes(
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minor, buf, 2
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);
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if (rv == 2) {
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sc = rtems_libi2c_send_stop(minor);
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}
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}
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rw->bytes_moved = sc == RTEMS_SUCCESSFUL ? 2 : 0;
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return sc;
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}
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static rtems_status_code i2c_sc620_read(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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(void) major;
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rtems_status_code sc = RTEMS_IO_ERROR;
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rtems_libio_rw_args_t *rw = arg;
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unsigned char *buf = (unsigned char *) &rw->buffer[0];
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if (rw->count == 1 && buf[0] < SC620_REG_COUNT) {
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int rv;
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rv = rtems_libi2c_start_write_bytes(minor, buf, 1);
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if (rv == 1) {
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sc = rtems_libi2c_send_addr(minor, 0);
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if (sc == RTEMS_SUCCESSFUL) {
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rv = rtems_libi2c_read_bytes(minor, buf, 1);
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if (rv == 1) {
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sc = rtems_libi2c_send_stop(minor);
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}
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}
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}
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}
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rw->bytes_moved = sc == RTEMS_SUCCESSFUL ? 1 : 0;
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return sc;
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}
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static rtems_driver_address_table i2c_sc620_ops = {
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.read_entry = i2c_sc620_read,
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.write_entry = i2c_sc620_write
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};
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rtems_libi2c_drv_t i2c_sc620_driver = {
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.ops = &i2c_sc620_ops,
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.size = sizeof(i2c_sc620_driver)
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};
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