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Commit 928b17b2 authored by Abhijeet Dharmapurikar's avatar Abhijeet Dharmapurikar
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power: qpnp-fg: Increase precision of voltage and current 



The driver currently uses 153 as LSB value. Instead use 152.587 for
accurate voltage and current readings.

Change-Id: I52feb423cccff32603e4fc441e2bf15e7d98e445
Signed-off-by: default avatarAbhijeet Dharmapurikar <adharmap@codeaurora.org>
parent 53ae2296

drivers/power/qpnp-fg.c

+8 −3
Original line number Diff line number Diff line
@@ -998,7 +998,8 @@ static int fg_is_batt_id_valid(struct fg_chip *chip) 
	return (fg_batt_sts & BATT_IDED) ? 1 : 0;

}



#define LSB_16B		153

#define LSB_16B_NUMRTR		152587

#define LSB_16B_DENMTR		1000

#define LSB_8B		9800

#define TEMP_LSB_16B	625

#define DECIKELVIN	2730
@@ -1026,10 +1027,14 @@ static void update_sram_data(struct fg_chip *chip, int *resched_ms) 
		switch (i) {

		case FG_DATA_OCV:

		case FG_DATA_VOLTAGE:

			fg_data[i].value = ((u16) temp) * LSB_16B;

			fg_data[i].value = div_u64(

					(u64)(u16)temp * LSB_16B_NUMRTR,

					LSB_16B_DENMTR);

			break;

		case FG_DATA_CURRENT:

			fg_data[i].value = temp * LSB_16B;

			fg_data[i].value = div_s64(

					(s64)temp * LSB_16B_NUMRTR,

					LSB_16B_DENMTR);

			break;

		case FG_DATA_BATT_ESR:

			fg_data[i].value = float_decode((u16) temp);