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[v3,5/7] thermal: armada: Allow to specify an 'inverted readout' sensor

Message ID 1399395591-5713-6-git-send-email-ezequiel.garcia@free-electrons.com (mailing list archive)
State Accepted, archived
Delegated to: Zhang Rui
Headers show

Commit Message

Ezequiel Garcia May 6, 2014, 4:59 p.m. UTC 
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>
---
 drivers/thermal/armada_thermal.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
index 6fd6483..f84d9f0 100644
--- a/drivers/thermal/armada_thermal.c
+++ b/drivers/thermal/armada_thermal.c
@@ -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;
 }