IBASE IB113 User Manual

Page 53

IBASE Technology Inc.

}

static int lookup_i2c_bus_by_name(const char *bus_name)
{
struct i2c_adap *adapters;
int i, i2cbus = -1;

adapters = gather_i2c_busses();
if (adapters == NULL) {
fprintf(stderr, "Error: Out of memory!\n");
return -3;
}

/* Walk the list of i2c busses, looking for the one with the
right name */
for (i = 0; adapters[i].name; i++) {
if (strcmp(adapters[i].name, bus_name) == 0) {
if (i2cbus >= 0) {
fprintf(stderr,
"Error: I2C bus name is not unique!\n");
i2cbus = -4;
goto done;
}
i2cbus = adapters[i].nr;
}
}

if (i2cbus == -1)
fprintf(stderr, "Error: I2C bus name doesn't match any "
"bus present!\n");

done:
free_adapters(adapters);
return i2cbus;
}

/*
* Parse an I2CBUS command line argument and return the corresponding
* bus number, or a negative value if the bus is invalid.
*/
int lookup_i2c_bus(const char *i2cbus_arg)
{
unsigned long i2cbus;
char *end;

i2cbus = strtoul(i2cbus_arg, &end, 0);
if (*end || !*i2cbus_arg) {
/* Not a number, maybe a name? */
return lookup_i2c_bus_by_name(i2cbus_arg);
}
if (i2cbus > 0xFFFFF) {
fprintf(stderr, "Error: I2C bus out of range!\n");
return -2;
}

return i2cbus;
}

/*
* Parse a CHIP-ADDRESS command line argument and return the corresponding
* chip address, or a negative value if the address is invalid.
*/
int parse_i2c_address(const char *address_arg)
{
long address;
char *end;

address = strtol(address_arg, &end, 0);
if (*end || !*address_arg) {
fprintf(stderr, "Error: Chip address is not a number!\n");