linux-kernel - Re: [PATCH 2/4] iio: adc: ad4695: implement calibration support

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Message-ID: <202408211207.fmYTjQDK-lkp@intel.com>
Date: Wed, 21 Aug 2024 12:21:09 +0800
From: kernel test robot <lkp@...el.com>
To: David Lechner <dlechner@...libre.com>,
	Jonathan Cameron <jic23@...nel.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Jonathan Corbet <corbet@....net>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	David Lechner <dlechner@...libre.com>
Subject: Re: [PATCH 2/4] iio: adc: ad4695: implement calibration support

Hi David,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 0f718e10da81446df0909c9939dff2b77e3b4e95]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Lechner/iio-adc-ad4695-add-2nd-regmap-for-16-bit-registers/20240821-000102
base:   0f718e10da81446df0909c9939dff2b77e3b4e95
patch link:    https://lore.kernel.org/r/20240820-ad4695-gain-offset-v1-2-c8f6e3b47551%40baylibre.com
patch subject: [PATCH 2/4] iio: adc: ad4695: implement calibration support
config: i386-buildonly-randconfig-002-20240821 (https://download.01.org/0day-ci/archive/20240821/202408211207.fmYTjQDK-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240821/202408211207.fmYTjQDK-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408211207.fmYTjQDK-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/iio/adc/ad4695.c:735:6: warning: unused variable 'ret' [-Wunused-variable]
     735 |         int ret;
         |             ^~~
   1 warning generated.


vim +/ret +735 drivers/iio/adc/ad4695.c

   728	
   729	static int ad4695_write_raw(struct iio_dev *indio_dev,
   730				    struct iio_chan_spec const *chan,
   731				    int val, int val2, long mask)
   732	{
   733		struct ad4695_state *st = iio_priv(indio_dev);
   734		unsigned int reg_val;
 > 735		int ret;
   736	
   737		iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
   738			switch (mask) {
   739			case IIO_CHAN_INFO_CALIBSCALE:
   740				switch (chan->type) {
   741				case IIO_VOLTAGE:
   742					if (val < 0 || val2 < 0)
   743						reg_val = 0;
   744					else if (val > 1)
   745						reg_val = U16_MAX;
   746					else
   747						reg_val = (val * (1 << 16) +
   748							   mul_u64_u32_div(val2, 1 << 16,
   749									   MICRO)) / 2;
   750	
   751					return regmap_write(st->regmap16,
   752						AD4695_REG_GAIN_IN(chan->scan_index),
   753						reg_val);
   754				default:
   755					return -EINVAL;
   756				}
   757			case IIO_CHAN_INFO_CALIBBIAS:
   758				switch (chan->type) {
   759				case IIO_VOLTAGE:
   760					if (val2 >= 0 && val > S16_MAX / 4)
   761						reg_val = S16_MAX;
   762					else if ((val2 < 0 ? -val : val) < S16_MIN / 4)
   763						reg_val = S16_MIN;
   764					else if (val2 < 0)
   765						reg_val = clamp_t(int,
   766							-(val * 4 + -val2 * 4 / MICRO),
   767							S16_MIN, S16_MAX);
   768					else if (val < 0)
   769						reg_val = clamp_t(int,
   770							val * 4 - val2 * 4 / MICRO,
   771							S16_MIN, S16_MAX);
   772					else
   773						reg_val = clamp_t(int,
   774							val * 4 + val2 * 4 / MICRO,
   775							S16_MIN, S16_MAX);
   776	
   777					return regmap_write(st->regmap16,
   778						AD4695_REG_OFFSET_IN(chan->scan_index),
   779						reg_val);
   780				default:
   781					return -EINVAL;
   782				}
   783			default:
   784				return -EINVAL;
   785			}
   786		}
   787		unreachable();
   788	}
   789	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki