2 * Author: Brendan Le Foll
3 * Copyright (c) 2014 Intel Corporation.
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29 I2CSlave::I2CSlave(unsigned int sda, unsigned int scl)
31 // Galileo only has one I2C master which should be /dev/i2c-0
32 // reliability is a fickle friend!
33 if ((i2c_handle = open("/dev/i2c-0", O_RDWR)) < 1) {
34 fprintf(stderr, "Failed to open requested i2c port");
39 I2CSlave::frequency(int hz)
45 I2CSlave::receive(void)
51 I2CSlave::read(char *data, int length)
53 // this is the read(3) syscall not I2CSlave::read()
54 if (::read(i2c_handle, data, length) == length) {
64 if (byte = i2c_smbus_read_byte(i2c_handle) < 0) {
71 I2CSlave::write(const char *data, int length)
73 if (i2c_smbus_write_i2c_block_data(i2c_handle, data[0], length-1, (uint8_t*) data+1) < 0) {
74 fprintf(stderr, "Failed to write to I2CSlave slave\n");
81 I2CSlave::write(int data)
83 if (i2c_smbus_write_byte(i2c_handle, data) < 0) {
84 fprintf(stderr, "Failed to write to I2CSlave slave\n");
91 I2CSlave::address(int addr)
94 if (ioctl(i2c_handle, I2C_SLAVE_FORCE, addr) < 0) {
95 fprintf(stderr, "Failed to set slave address %d\n", addr);