dev/pmic/pm8x41/qpnp-fg-gen3.c

/* Copyright (c) 2015, 2019, The Linux Foundation. All rights reserved.

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 *     with the distribution.
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 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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#include <bits.h>
#include <debug.h>
#include <stdlib.h>
#include <pm8x41.h>
#include <pm8x41_hw.h>
#include <qpnp-fg-gen3.h>
#include <reg.h>

#define BATT_INFO_VBATT_LSB	0x41A0
#define BATT_INFO_VBATT_MSB	0x41A1
#define BATT_INFO_CURR_LSB	0x41A2
#define BATT_INFO_CURR_MSB	0x41A3

#define BATT_VOLTAGE_NUMR	122070
#define BATT_VOLTAGE_DENR	1000
#define BATT_CURRENT_NUMR	488281
#define BATT_CURRENT_DENR	1000

#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))

static int64_t twos_compliment_extend(int64_t val, int sign_bit_pos)
{
	int i, nbytes = DIV_ROUND_UP(sign_bit_pos, 8);
	int64_t mask, val_out;

	val_out = val;
	mask = 1 << sign_bit_pos;
	if (val & mask) {
		for (i = 8; i > nbytes; i--) {
			mask = 0xFFLL << ((i - 1) * 8);
			val_out |= mask;
		}

		if ((nbytes * 8) - 1 > sign_bit_pos) {
			mask = 1 << sign_bit_pos;
			for (i = 1; i <= (nbytes * 8) - sign_bit_pos; i++)
				val_out |= mask << i;
		}
	}

	return val_out;
}

uint32_t fg_gen3_get_battery_voltage(void)
{
	uint8_t buff[2];
	uint16_t temp;
	uint32_t vbat = 0;

	buff[0] = REG_READ(BATT_INFO_VBATT_LSB);
	buff[1] = REG_READ(BATT_INFO_VBATT_MSB);
	temp = buff[1] << 8 | buff[0];
	/* {MSB,LSB} to decode the voltage level, refer register description. */
	vbat = (((uint64_t)temp)*BATT_VOLTAGE_NUMR/BATT_VOLTAGE_DENR);

	return vbat;
}

int fg_gen3_get_battery_current(void)
{
	uint8_t buff[2];
	int current = 0;
	int64_t temp = 0;

	buff[0] = REG_READ(BATT_INFO_CURR_LSB);
	buff[1] = REG_READ(BATT_INFO_CURR_MSB);
	temp = buff[1] << 8 | buff[0];
	/* Sign bit is bit 15 */
	temp = twos_compliment_extend(temp, 15);
	current = (((int64_t)temp)*BATT_CURRENT_NUMR/BATT_CURRENT_DENR);

	return current;
}