linux-kernel - [PATCH 40/57] power: ab8500: ADC for battery thermistor

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Date:	Tue, 25 Sep 2012 10:12:37 -0600
From:	mathieu.poirier@...aro.org
To:	linux-kernel@...r.kernel.org, cbou@...l.ru, dwmw2@...radead.org
Cc:	mathieu.poirier@...aro.org
Subject: [PATCH 40/57] power: ab8500: ADC for battery thermistor

From: Marcus Cooper <marcus.xm.cooper@...ricsson.com>

When using ABx500_ADC_THERM_BATCTRL the battery ID resistor
is combined with a NTC resistor to both identify the battery and
to measure its temperature.

Signed-off-by: Marcus Cooper <marcus.xm.cooper@...ricsson.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Reviewed-by: Mian Yousaf KAUKAB <mian.yousaf.kaukab@...ricsson.com>
Reviewed-by: Michel JAOUEN <michel.jaouen@...ricsson.com>
Reviewed-by: Hakan BERG <hakan.berg@...ricsson.com>
Reviewed-by: Rabin VINCENT <rabin.vincent@...ricsson.com>
---
 drivers/power/ab8500_btemp.c |    4 +++-
 include/linux/mfd/abx500.h   |    2 ++
 2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/power/ab8500_btemp.c b/drivers/power/ab8500_btemp.c
index 506f124..56a3bb9 100644
--- a/drivers/power/ab8500_btemp.c
+++ b/drivers/power/ab8500_btemp.c
@@ -557,7 +557,9 @@ static int ab8500_btemp_id(struct ab8500_btemp *di)
 	/* BATTERY_UNKNOWN is defined on position 0, skip it! */
 	for (i = BATTERY_UNKNOWN + 1; i < di->bat->n_btypes; i++) {
 		if ((res <= di->bat->bat_type[i].resis_high) &&
-			(res >= di->bat->bat_type[i].resis_low)) {
+			(res >= di->bat->bat_type[i].resis_low) &&
+			(di->bat->bat_type[i].adc_therm ==
+							di->bat->adc_therm)) {
 			dev_dbg(di->dev, "Battery detected on %s"
 				" low %d < res %d < high: %d"
 				" index: %d\n",
diff --git a/include/linux/mfd/abx500.h b/include/linux/mfd/abx500.h
index 97e918f..cb2b82a 100644
--- a/include/linux/mfd/abx500.h
+++ b/include/linux/mfd/abx500.h
@@ -270,6 +270,7 @@ struct abx500_maxim_parameters {
  * @low_high_cur_lvl:		charger current in temp low/high state in mA
  * @low_high_vol_lvl:		charger voltage in temp low/high state in mV'
  * @battery_resistance:		battery inner resistance in mOhm.
+ * @adc_therm:			battery uses controller or resistor for temp.
  * @n_r_t_tbl_elements:		number of elements in r_to_t_tbl
  * @r_to_t_tbl:			table containing resistance to temp points
  * @n_v_cap_tbl_elements:	number of elements in v_to_cap_tbl
@@ -297,6 +298,7 @@ struct abx500_battery_type {
 	int low_high_cur_lvl;
 	int low_high_vol_lvl;
 	int battery_resistance;
+	enum abx500_adc_therm adc_therm;
 	int n_temp_tbl_elements;
 	struct abx500_res_to_temp *r_to_t_tbl;
 	int n_v_cap_tbl_elements;
-- 
1.7.5.4

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