IBASE MRS-801-RE - Manual (Page 58)

50 MRS-801-RE User Manual
#include <unistd.h>
#include <linux/i2c-dev.h>
#include "i2cbusses.h"
#include "util.h"
#include "../version.h"
static void help(void) __attribute__ ((noreturn));
static void help(void)
{
fprintf(stderr,
"Usage: i2cget [-f] [-y] I2CBUS CHIP-ADDRESS [DATA-ADDRESS [MODE]]\n"
" I2CBUS is an integer or an I2C bus name\n"
" ADDRESS is an integer (0x03 - 0x77)\n"
" MODE is one of:\n"
" b (read byte data, default)\n"
" w (read word data)\n"
" c (write byte/read byte)\n"
" Append p for SMBus PEC\n");
exit(1);
}
static int check_funcs(int file, int size, int daddress, int pec)
{
unsigned long funcs;
/* check adapter functionality */
if (ioctl(file, I2C_FUNCS, &funcs) < 0) {
fprintf(stderr, "Error: Could not get the adapter "
"functionality matrix: %s\n", strerror(errno));
return -1;
}
switch (size) {
case I2C_SMBUS_BYTE:
if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE)) {
fprintf(stderr, MISSING_FUNC_FMT, "SMBus receive byte");
return -1;