u-boot/drivers/power/pmic/pmic_max8997.c

// SPDX-License-Identifier: GPL-2.0+
/*
 *  Copyright (C) 2012 Samsung Electronics
 *  Lukasz Majewski <l.majewski@samsung.com>
 */

#include <common.h>
#include <power/pmic.h>
#include <power/max8997_pmic.h>
#include <i2c.h>
#include <errno.h>

unsigned char max8997_reg_ldo(int uV)
{
	unsigned char ret;
	if (uV <= 800000)
		return 0;
	if (uV >= 3950000)
		return MAX8997_LDO_MAX_VAL;
	ret = (uV - 800000) / 50000;
	if (ret > MAX8997_LDO_MAX_VAL) {
		printf("MAX8997 LDO SETTING ERROR (%duV) -> %u\n", uV, ret);
		ret = MAX8997_LDO_MAX_VAL;
	}

	return ret;
}

static int pmic_charger_state(struct pmic *p, int state, int current)
{
	unsigned char fc;
	u32 val = 0;

	if (pmic_probe(p))
		return -ENODEV;

	if (state == PMIC_CHARGER_DISABLE) {
		puts("Disable the charger.\n");
		pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
		val &= ~(MBCHOSTEN | VCHGR_FC);
		pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);

		return -ENOTSUPP;
	}

	if (current < CHARGER_MIN_CURRENT || current > CHARGER_MAX_CURRENT) {
		printf("%s: Wrong charge current: %d [mA]\n",
		       __func__, current);
		return -EINVAL;
	}

	fc = (current - CHARGER_MIN_CURRENT) / CHARGER_CURRENT_RESOLUTION;
	fc = fc & 0xf; /* up to 950 mA */

	printf("Enable the charger @ %d [mA]\n", fc * CHARGER_CURRENT_RESOLUTION
	       + CHARGER_MIN_CURRENT);

	val = fc | MBCICHFCSET;
	pmic_reg_write(p, MAX8997_REG_MBCCTRL4, val);

	pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
	val = MBCHOSTEN | VCHGR_FC; /* enable charger & fast charge */
	pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);

	return 0;
}

static int pmic_charger_bat_present(struct pmic *p)
{
	u32 val;

	if (pmic_probe(p))
		return -ENODEV;

	pmic_reg_read(p, MAX8997_REG_STATUS4, &val);

	return !(val & DETBAT);
}

static struct power_chrg power_chrg_pmic_ops = {
	.chrg_bat_present = pmic_charger_bat_present,
	.chrg_state = pmic_charger_state,
};

int pmic_init(unsigned char bus)
{
	static const char name[] = "MAX8997_PMIC";
	struct pmic *p = pmic_alloc();

	if (!p) {
		printf("%s: POWER allocation error!\n", __func__);
		return -ENOMEM;
	}

	debug("Board PMIC init\n");

	p->name = name;
	p->interface = PMIC_I2C;
	p->number_of_regs = PMIC_NUM_OF_REGS;
	p->hw.i2c.addr = MAX8997_I2C_ADDR;
	p->hw.i2c.tx_num = 1;
	p->bus = bus;

	p->chrg = &power_chrg_pmic_ops;
	return 0;
}