MCP3911_REG_CONFIG
return mcp3911_update(adc, MCP3911_REG_CONFIG, mask, osr, 2);
ret = mcp3911_read(adc, MCP3911_REG_CONFIG, val, 2);
ret = mcp3911_read(adc, MCP3911_REG_CONFIG, ®val, 2);
ret = mcp3911_write(adc, MCP3911_REG_CONFIG, regval, 2);