Kontron KTAM3874-pITX - Manual (Page 47)

KTD-S0057-I Page 43 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
#define I2C_FUNC_SMBUS_READ_BLOCK_DATA
0x01000000
#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000
#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000
#define I2C_SMBUS_READ 1
#define I2C_SMBUS_BYTE 1
#define I2C_SLAVE 0x0703
#define I2C_FUNCS 0x0705
#define I2C_SMBUS 0x0720
#define I2C_SMBUS_BLOCK_MAX 32
struct func
{
long
value;
const char* name;
};
union i2c_smbus_data
{
__u8
byte;
__u16 word;
__u8 block[I2C_SMBUS_BLOCK_MAX + 2];
};
struct i2c_smbus_ioctl_data
{
char
read_write;
__u8 command;
int size;
union i2c_smbus_data *data;
};
static void help (void)
{
fprintf (stderr, "Usage: i2cdetect [I2CBUS] [FIRST LAST]\n"
" i2cdetect -F [I2CBUS]\n"
" I2CBUS is an integer or an I2C bus name\n"
" If provided, FIRST and LAST limit the probing range.\n");
}
static inline __s32 i2c_smbus_access (int file, char read_write, __u8 command,
int size, union i2c_smbus_data *data)
{
struct i2c_smbus_ioctl_data args;
args.read_write = read_write;
args.command = command;
args.size = size;
args.data = data;
return ioctl (file, I2C_SMBUS, &args);
}