unsigned char do_smbus_read_byte(unsigned smbus_io_base,
unsigned char device,
unsigned char address)
{
unsigned char error = 0;
if ((smbus_check_stop_condition(smbus_io_base))) {
error = 1;
goto err;
}
if ((smbus_start_condition(smbus_io_base))) {
error = 2;
goto err;
}
if ((smbus_send_slave_address(smbus_io_base, device << 1))) {
error = 3;
goto err;
}
smbus_ack(smbus_io_base, 1);
if ((smbus_send_command(smbus_io_base, address))) {
error = 4;
goto err;
}
if ((smbus_start_condition(smbus_io_base))) {
error = 5;
goto err;
}
if ((smbus_send_slave_address(smbus_io_base, (device << 1) | 0x01))) {
error = 6;
goto err;
}
if ((smbus_stop_condition(smbus_io_base))) {
error = 7;
goto err;
}
return smbus_get_result(smbus_io_base);
err:
print_debug("SMBUS READ ERROR:");
print_debug_hex8(error);
print_debug(" device:");
print_debug_hex8(device);
print_debug("\n");
/* stop, clean up the error, and leave */
smbus_stop_condition(smbus_io_base);
outb(inb(smbus_io_base + SMB_STS), smbus_io_base + SMB_STS);
outb(0x0, smbus_io_base + SMB_STS);
return 0xFF;
}
/* Send config data to System Management Controller via SMB. */
static int smc_send_config(unsigned char config_data)
{
if (smbus_check_stop_condition(SMBUS_IO_BASE))
return 1;
if (smbus_start_condition(SMBUS_IO_BASE))
return 2;
if (smbus_send_slave_address(SMBUS_IO_BASE, 0x50)) // SMC address
return 3;
if (smbus_send_command(SMBUS_IO_BASE, 0x28)) // set config data
return 4;
if (smbus_send_command(SMBUS_IO_BASE, 0x01)) // data length
return 5;
if (smbus_send_command(SMBUS_IO_BASE, config_data))
return 6;
smbus_stop_condition(SMBUS_IO_BASE);
return 0;
}