From a168d88fdc222312e27a89dc07ab4132eee765e6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ond=C5=99ej=20Jirman?= Date: Wed, 23 Sep 2020 14:59:41 +0200 Subject: [PATCH 283/480] power: supply: axp20x_battery: Setup thermal regulation (experimental) Values for NTC resistances were pulled out of thin air! None of this is tested to actually work. Signed-off-by: Ondrej Jirman --- drivers/power/supply/axp20x_battery.c | 53 +++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/drivers/power/supply/axp20x_battery.c b/drivers/power/supply/axp20x_battery.c index f19ab493245b..1bac1a934614 100644 --- a/drivers/power/supply/axp20x_battery.c +++ b/drivers/power/supply/axp20x_battery.c @@ -1146,6 +1146,59 @@ static int axp20x_power_probe(struct platform_device *pdev) */ axp20x_get_constant_charge_current(axp20x_batt, &axp20x_batt->max_ccc); + if (of_machine_is_compatible("pine64,pinephone-1.2") > 0 || + of_machine_is_compatible("pine64,pinephone-1.1") > 0 || + of_machine_is_compatible("pine64,pinephone-1.0") > 0) { + // 3kOhm NTC inside PinePhone batery + // --------------------------------- + // + // Charging: + // 0 - 15 °C: Max 0.2C CC to 4.35V : 9750 Ohm - 4710 Ohm + // 15 - 50 °C: Max 0.5C CC to 4.35V : 4710 Ohm - 1080 Ohm + // + // Discharging: + // -10 °C : 16500 Ohm + // 55 °C : 896 Ohm + // enable TS pin input to ADC + + dev_info(dev, "Configuring battery thermal regulation for Pinephone\n"); + + ret = regmap_update_bits(axp20x_batt->regmap, 0x82, BIT(0), BIT(0)); + if (ret) + goto warn_bat; + + // safety thresholds: + + // voltage = reg_val * 12800 uV (range is 0 - 3.264V) + ret = regmap_write(axp20x_batt->regmap, 0x38, 9750 * 80 / 12800); // V_LTF-charge + if (ret) + goto warn_bat; + + ret = regmap_write(axp20x_batt->regmap, 0x39, 1080 * 80 / 12800); // V_HTF-charge + if (ret) + goto warn_bat; + + ret = regmap_write(axp20x_batt->regmap, 0x3c, 16500 * 80 / 12800); // V_LTF-work + if (ret) + goto warn_bat; + + ret = regmap_write(axp20x_batt->regmap, 0x3d, 896 * 80 / 12800); // V_HTF-work + if (ret) + goto warn_bat; + + // There is a hysteresis of 460.8 mV(refer to TS pin voltage) for UTP + // threshold, and there is a hysteresis of 57.6 mV for OTP threshold. + + // use TS pin only when charging, make it affect the charger, I = 80uA + ret = regmap_update_bits(axp20x_batt->regmap, 0x84, 0x37, 0x31); + if (ret) + goto warn_bat; + } + + return 0; + +warn_bat: + dev_err(dev, "Failed to configure battery thermal regulation\n"); return 0; } -- 2.49.0