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      1 // SPDX-License-Identifier: GPL-2.0+
      2 /*
      3  *  Copyright (C) 2012 Samsung Electronics
      4  *  Lukasz Majewski <l.majewski (at) samsung.com>
      5  */
      6 
      7 #include <common.h>
      8 #include <power/pmic.h>
      9 #include <power/max8997_pmic.h>
     10 #include <i2c.h>
     11 #include <errno.h>
     12 
     13 unsigned char max8997_reg_ldo(int uV)
     14 {
     15 	unsigned char ret;
     16 	if (uV <= 800000)
     17 		return 0;
     18 	if (uV >= 3950000)
     19 		return MAX8997_LDO_MAX_VAL;
     20 	ret = (uV - 800000) / 50000;
     21 	if (ret > MAX8997_LDO_MAX_VAL) {
     22 		printf("MAX8997 LDO SETTING ERROR (%duV) -> %u\n", uV, ret);
     23 		ret = MAX8997_LDO_MAX_VAL;
     24 	}
     25 
     26 	return ret;
     27 }
     28 
     29 static int pmic_charger_state(struct pmic *p, int state, int current)
     30 {
     31 	unsigned char fc;
     32 	u32 val = 0;
     33 
     34 	if (pmic_probe(p))
     35 		return -ENODEV;
     36 
     37 	if (state == PMIC_CHARGER_DISABLE) {
     38 		puts("Disable the charger.\n");
     39 		pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
     40 		val &= ~(MBCHOSTEN | VCHGR_FC);
     41 		pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);
     42 
     43 		return -ENOTSUPP;
     44 	}
     45 
     46 	if (current < CHARGER_MIN_CURRENT || current > CHARGER_MAX_CURRENT) {
     47 		printf("%s: Wrong charge current: %d [mA]\n",
     48 		       __func__, current);
     49 		return -EINVAL;
     50 	}
     51 
     52 	fc = (current - CHARGER_MIN_CURRENT) / CHARGER_CURRENT_RESOLUTION;
     53 	fc = fc & 0xf; /* up to 950 mA */
     54 
     55 	printf("Enable the charger @ %d [mA]\n", fc * CHARGER_CURRENT_RESOLUTION
     56 	       + CHARGER_MIN_CURRENT);
     57 
     58 	val = fc | MBCICHFCSET;
     59 	pmic_reg_write(p, MAX8997_REG_MBCCTRL4, val);
     60 
     61 	pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
     62 	val = MBCHOSTEN | VCHGR_FC; /* enable charger & fast charge */
     63 	pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);
     64 
     65 	return 0;
     66 }
     67 
     68 static int pmic_charger_bat_present(struct pmic *p)
     69 {
     70 	u32 val;
     71 
     72 	if (pmic_probe(p))
     73 		return -ENODEV;
     74 
     75 	pmic_reg_read(p, MAX8997_REG_STATUS4, &val);
     76 
     77 	return !(val & DETBAT);
     78 }
     79 
     80 static struct power_chrg power_chrg_pmic_ops = {
     81 	.chrg_bat_present = pmic_charger_bat_present,
     82 	.chrg_state = pmic_charger_state,
     83 };
     84 
     85 int pmic_init(unsigned char bus)
     86 {
     87 	static const char name[] = "MAX8997_PMIC";
     88 	struct pmic *p = pmic_alloc();
     89 
     90 	if (!p) {
     91 		printf("%s: POWER allocation error!\n", __func__);
     92 		return -ENOMEM;
     93 	}
     94 
     95 	debug("Board PMIC init\n");
     96 
     97 	p->name = name;
     98 	p->interface = PMIC_I2C;
     99 	p->number_of_regs = PMIC_NUM_OF_REGS;
    100 	p->hw.i2c.addr = MAX8997_I2C_ADDR;
    101 	p->hw.i2c.tx_num = 1;
    102 	p->bus = bus;
    103 
    104 	p->chrg = &power_chrg_pmic_ops;
    105 	return 0;
    106 }
    107