forked from Imagelibrary/rtems
92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/**
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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. All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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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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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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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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