91 lines
2.8 KiB
Diff
91 lines
2.8 KiB
Diff
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From cb8f4a79243bfb0e54570d9ca616f4d6106f7b74 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ond=C5=99ej=20Jirman?= <megi@xff.cz>
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Date: Wed, 23 Sep 2020 14:59:41 +0200
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Subject: [PATCH 225/464] power: supply: axp20x_battery: Setup thermal
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regulation (experimental)
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Values for NTC resistances were pulled out of thin air!
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None of this is tested to actually work.
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Signed-off-by: Ondrej Jirman <megi@xff.cz>
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---
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drivers/power/supply/axp20x_battery.c | 54 +++++++++++++++++++++++++++
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1 file changed, 54 insertions(+)
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diff --git a/drivers/power/supply/axp20x_battery.c b/drivers/power/supply/axp20x_battery.c
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index 8ff7042ff852..1ca11e93f984 100644
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--- a/drivers/power/supply/axp20x_battery.c
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+++ b/drivers/power/supply/axp20x_battery.c
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@@ -590,6 +590,7 @@ static int axp20x_power_probe(struct platform_device *pdev)
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struct power_supply_config psy_cfg = {};
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struct power_supply_battery_info *info;
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struct device *dev = &pdev->dev;
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+ int ret;
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if (!of_device_is_available(pdev->dev.of_node))
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return -ENODEV;
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@@ -670,6 +671,59 @@ static int axp20x_power_probe(struct platform_device *pdev)
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axp20x_get_constant_charge_current(axp20x_batt,
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&axp20x_batt->max_ccc);
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+ if (of_machine_is_compatible("pine64,pinephone-1.2") > 0 ||
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+ of_machine_is_compatible("pine64,pinephone-1.1") > 0 ||
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+ of_machine_is_compatible("pine64,pinephone-1.0") > 0) {
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+ // 3kOhm NTC inside PinePhone batery
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+ // ---------------------------------
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+ //
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+ // Charging:
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+ // 0 - 15 °C: Max 0.2C CC to 4.35V : 9750 Ohm - 4710 Ohm
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+ // 15 - 50 °C: Max 0.5C CC to 4.35V : 4710 Ohm - 1080 Ohm
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+ //
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+ // Discharging:
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+ // -10 °C : 16500 Ohm
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+ // 55 °C : 896 Ohm
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+ // enable TS pin input to ADC
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+
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+ dev_info(dev, "Configuring battery thermal regulation for Pinephone\n");
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+
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+ ret = regmap_update_bits(axp20x_batt->regmap, 0x82, BIT(0), BIT(0));
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+ if (ret)
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+ goto warn_bat;
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+
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+ // safety thresholds:
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+
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+ // voltage = reg_val * 12800 uV (range is 0 - 3.264V)
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+ ret = regmap_write(axp20x_batt->regmap, 0x38, 9750 * 80 / 12800); // V_LTF-charge
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+ if (ret)
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+ goto warn_bat;
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+
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+ ret = regmap_write(axp20x_batt->regmap, 0x39, 1080 * 80 / 12800); // V_HTF-charge
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+ if (ret)
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+ goto warn_bat;
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+
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+ ret = regmap_write(axp20x_batt->regmap, 0x3c, 16500 * 80 / 12800); // V_LTF-work
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+ if (ret)
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+ goto warn_bat;
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+
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+ ret = regmap_write(axp20x_batt->regmap, 0x3d, 896 * 80 / 12800); // V_HTF-work
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+ if (ret)
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+ goto warn_bat;
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+
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+ // There is a hysteresis of 460.8 mV(refer to TS pin voltage) for UTP
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+ // threshold, and there is a hysteresis of 57.6 mV for OTP threshold.
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+
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+ // use TS pin only when charging, make it affect the charger, I = 80uA
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+ ret = regmap_update_bits(axp20x_batt->regmap, 0x84, 0x37, 0x31);
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+ if (ret)
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+ goto warn_bat;
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+ }
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+
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+ return 0;
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+
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+warn_bat:
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+ dev_err(dev, "Failed to configure battery thermal regulation\n");
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return 0;
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}
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--
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2.34.1
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