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| author | Jean-Francois Dagenais <jeff.dagenais@gmail.com> | 2019-04-18 12:37:32 -0400 |
|---|---|---|
| committer | Eduardo Valentin <edubezval@gmail.com> | 2019-05-14 07:00:28 -0700 |
| commit | d36e2fa025387567710df740fd4dce1d5001b226 (patch) | |
| tree | c24a1197ecad07020ebede1884173ad00fd86060 /drivers/thermal | |
| parent | f86a7a847ca39e613985b7419ce3970af91486b1 (diff) | |
| download | lwn-d36e2fa025387567710df740fd4dce1d5001b226.tar.gz lwn-d36e2fa025387567710df740fd4dce1d5001b226.zip | |
thermal: generic-adc: make lookup table optional
Certain ADC channels, such as the xilinx-ams temperature channels, give
milliCelcius already when read with iio_read_channel_processed.
Rather than having to provide a 1:1 dummy lookup table, simply allow to
bypass the mechanism.
Signed-off-by: Jean-Francois Dagenais <jeff.dagenais@gmail.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/thermal-generic-adc.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/thermal/thermal-generic-adc.c b/drivers/thermal/thermal-generic-adc.c index e22fc60ad36d..deb244f12de4 100644 --- a/drivers/thermal/thermal-generic-adc.c +++ b/drivers/thermal/thermal-generic-adc.c @@ -29,6 +29,9 @@ static int gadc_thermal_adc_to_temp(struct gadc_thermal_info *gti, int val) int temp, temp_hi, temp_lo, adc_hi, adc_lo; int i; + if (!gti->lookup_table) + return val; + for (i = 0; i < gti->nlookup_table; i++) { if (val >= gti->lookup_table[2 * i + 1]) break; @@ -81,9 +84,9 @@ static int gadc_thermal_read_linear_lookup_table(struct device *dev, ntable = of_property_count_elems_of_size(np, "temperature-lookup-table", sizeof(u32)); - if (ntable < 0) { - dev_err(dev, "Lookup table is not provided\n"); - return ntable; + if (ntable <= 0) { + dev_notice(dev, "no lookup table, assuming DAC channel returns milliCelcius\n"); + return 0; } if (ntable % 2) { |