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thermal: armada: Allow to specify an 'inverted readout' sensor

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In order to support inverted-formula thermal sensor readout, this commit
introduces an 'inverted' field in the SoC-specific structure which
allows to specify an inversion of the temperature formula.

Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Ezequiel Garcia 2014-05-06 13:59:49 -03:00 committed by Zhang Rui
parent 04bf3d7e5b
commit fd2c94d5a3
1 changed files with 5 additions and 1 deletions
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6
drivers/thermal/armada_thermal.c
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@ -56,6 +56,7 @@ struct armada_thermal_data {
unsigned long coef_b;
unsigned long coef_m;
unsigned long coef_div;
bool inverted;
/* Register shift and mask to access the sensor temperature */
unsigned int temp_shift;
@ -138,7 +139,10 @@ static int armada_get_temp(struct thermal_zone_device *thermal,
m = priv->data->coef_m;
div = priv->data->coef_div;
*temp = (b - (m * reg)) / div;
if (priv->data->inverted)
*temp = ((m * reg) - b) / div;
else
*temp = (b - (m * reg)) / div;
return 0;
}