power: supply: ab8500: Drop BATCTRL thermal mode

The BATCTRL mode reads the temperature of the battery by
enabling a certain probing current (7-20 mA) and then measure
the voltage of the NTC mounted inside the battery.

None of the AB8500 product or the reference designs use this
mode. What we use is the so-called BATTEMP mode which enables
an internal 230 kOhm pull-up to 1.8 V to the external NTC on
pin BatTemp (N16) and then measures the voltage over the NTC
using the ADC:

        1.8V (VTVOUT)
         |
        [ ] 230 kOhm
         |
BatTemp  +---------------- ADC
Pin N16  | _
         |/
        [/] NTC
       _/|
         |
        GND

Cut out the BATCTRL code to clear the forest and stop
maintaining code we can never test.

The current inducing method is still used to probe for the
battery type using the internal BTI (battery type indicator)
on the BatCtrl (C3) pin in a separate code path.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

1 files changed, 0 insertions, 16 deletions

diff --git a/drivers/power/supply/ab8500-bm.h b/drivers/power/supply/ab8500-bm.h
index 56a5aaf9a27a..3bc6fd9337d2 100644
--- a/drivers/power/supply/ab8500-bm.h
+++ b/drivers/power/supply/ab8500-bm.h
@@ -260,18 +260,6 @@ enum bup_vch_sel {
 #define BUS_PP_PRECHG_CURRENT_MASK		0x0E
 #define BUS_POWER_PATH_PRECHG_ENA		0x01
 
-/*
- * ADC for the battery thermistor.
- * When using the AB8500_ADC_THERM_BATCTRL the battery ID resistor is combined
- * with a NTC resistor to both identify the battery and to measure its
- * temperature. Different phone manufactures uses different techniques to both
- * identify the battery and to read its temperature.
- */
-enum ab8500_adc_therm {
-	AB8500_ADC_THERM_BATCTRL,
-	AB8500_ADC_THERM_BATTEMP,
-};
-
 /**
  * struct ab8500_res_to_temp - defines one point in a temp to res curve. To
  * be used in battery packs that combines the identification resistor with a
@@ -423,7 +411,6 @@ struct ab8500_bm_charger_parameters {
  * @bkup_bat_i		current which we charge the backup battery with
  * @no_maintenance	indicates that maintenance charging is disabled
  * @capacity_scaling    indicates whether capacity scaling is to be used
- * @ab8500_adc_therm	placement of thermistor, batctrl or battemp adc
  * @chg_unknown_bat	flag to enable charging of unknown batteries
  * @enable_overshoot	flag to enable VBAT overshoot control
  * @auto_trig		flag to enable auto adc trigger
@@ -431,7 +418,6 @@ struct ab8500_bm_charger_parameters {
  * @interval_charging	charge alg cycle period time when charging (sec)
  * @interval_not_charging charge alg cycle period time when not charging (sec)
  * @temp_hysteresis	temperature hysteresis
- * @gnd_lift_resistance	Battery ground to phone ground resistance (mOhm)
  * @maxi		maximization parameters
  * @cap_levels		capacity in percent for the different capacity levels
  * @bat_type		table of supported battery types
@@ -452,12 +438,10 @@ struct ab8500_bm_data {
 	bool chg_unknown_bat;
 	bool enable_overshoot;
 	bool auto_trig;
-	enum ab8500_adc_therm adc_therm;
 	int fg_res;
 	int interval_charging;
 	int interval_not_charging;
 	int temp_hysteresis;
-	int gnd_lift_resistance;
 	const struct ab8500_maxim_parameters *maxi;
 	const struct ab8500_bm_capacity_levels *cap_levels;
 	struct ab8500_battery_type *bat_type;