mcp3564_write_24bits
ret = mcp3564_write_24bits(adc, MCP3564_GAINCAL_REG, MCP3564_DEFAULT_GAINCAL);
ret = mcp3564_write_24bits(adc, MCP3564_OFFSETCAL_REG, MCP3564_DEFAULT_OFFSETCAL);
ret = mcp3564_write_24bits(adc, MCP3564_TIMER_REG, MCP3564_TIMER_DEFAULT_VALUE);
ret = mcp3564_write_24bits(adc, MCP3564_SCAN_REG,
ret = mcp3564_write_24bits(adc, MCP3564_OFFSETCAL_REG, val);
ret = mcp3564_write_24bits(adc, MCP3564_GAINCAL_REG, val);