Commit 1ae4a91c authored by Linus Walleij's avatar Linus Walleij Committed by Sebastian Reichel
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power: supply: ab8500_fg: Account for line impedance 



We add the line impedance to the inner resistance determined
from the battery voltage or other means to improve the
capacity estimations.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent 8dc35574

drivers/power/supply/ab8500_fg.c

+9 −0
Original line number Diff line number Diff line
@@ -213,6 +213,7 @@ struct ab8500_fg { 
	int init_cnt;

	int low_bat_cnt;

	int nbr_cceoc_irq_cnt;

	u32 line_impedance_uohm;

	bool recovery_needed;

	bool high_curr_mode;

	bool init_capacity;
@@ -910,6 +911,9 @@ static int ab8500_fg_battery_resistance(struct ab8500_fg *di, int vbat_uncomp_uv 
		resistance = bi->factory_internal_resistance_uohm / 1000;

	}



	/* Compensate for line impedance */

	resistance += (di->line_impedance_uohm / 1000);



	dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"

	    " fg resistance %d, total: %d (mOhm)\n",

		__func__, di->bat_temp, resistance, di->bm->fg_res / 10,
@@ -3098,6 +3102,11 @@ static int ab8500_fg_probe(struct platform_device *pdev) 
		return ret;

	}



	if (!of_property_read_u32(dev->of_node, "line-impedance-micro-ohms",

				  &di->line_impedance_uohm))

		dev_info(dev, "line impedance: %u uOhm\n",

			 di->line_impedance_uohm);



	psy_cfg.supplied_to = supply_interface;

	psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);

	psy_cfg.drv_data = di;