iwlwifi: use <linux/units.h> helpers

This switches the iwlwifi driver to use celsius_to_kelvin() and
kelvin_to_celsius() in <linux/units.h>.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Akinobu Mita <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Luca Coelho <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Emmanuel Grumbach <[email protected]>
Cc: Luca Coelho <[email protected]>
Cc: Amit Kucheria <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Hartmut Knaack <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Keith Busch <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Peter Meerwald-Stadler <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Cc: Sujith Thomas <[email protected]>
Cc: Zhang Rui <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

drivers/net/wireless/intel/iwlwifi/dvm/dev.h

@@ -237,11 +237,6 @@ struct iwl_sensitivity_ranges {
 	u16 nrg_th_cca;
 };
 
-
-#define KELVIN_TO_CELSIUS(x) ((x)-273)
-#define CELSIUS_TO_KELVIN(x) ((x)+273)
-
-
 /******************************************************************************
  *
  * Functions implemented in core module which are forward declared here

drivers/net/wireless/intel/iwlwifi/dvm/devices.c

@@ -10,6 +10,8 @@
  *
  *****************************************************************************/
 
+#include <linux/units.h>
+
 /*
  * DVM device-specific data & functions
  */
@@ -345,7 +347,7 @@ static s32 iwl_temp_calib_to_offset(struct iwl_priv *priv)
 static void iwl5150_set_ct_threshold(struct iwl_priv *priv)
 {
 	const s32 volt2temp_coef = IWL_5150_VOLTAGE_TO_TEMPERATURE_COEFF;
-	s32 threshold = (s32)CELSIUS_TO_KELVIN(CT_KILL_THRESHOLD_LEGACY) -
+	s32 threshold = (s32)celsius_to_kelvin(CT_KILL_THRESHOLD_LEGACY) -
 			iwl_temp_calib_to_offset(priv);
 
 	priv->hw_params.ct_kill_threshold = threshold * volt2temp_coef;
@@ -381,7 +383,7 @@ static void iwl5150_temperature(struct iwl_priv *priv)
 	vt = le32_to_cpu(priv->statistics.common.temperature);
 	vt = vt / IWL_5150_VOLTAGE_TO_TEMPERATURE_COEFF + offset;
 	/* now vt hold the temperature in Kelvin */
-	priv->temperature = KELVIN_TO_CELSIUS(vt);
+	priv->temperature = kelvin_to_celsius(vt);
 	iwl_tt_handler(priv);
 }