1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2012 Samsung Electronics
3*4882a593Smuzhiyun * Lukasz Majewski <l.majewski@samsung.com>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun #include <power/pmic.h>
10*4882a593Smuzhiyun #include <power/max8997_pmic.h>
11*4882a593Smuzhiyun #include <i2c.h>
12*4882a593Smuzhiyun #include <errno.h>
13*4882a593Smuzhiyun
max8997_reg_ldo(int uV)14*4882a593Smuzhiyun unsigned char max8997_reg_ldo(int uV)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun unsigned char ret;
17*4882a593Smuzhiyun if (uV <= 800000)
18*4882a593Smuzhiyun return 0;
19*4882a593Smuzhiyun if (uV >= 3950000)
20*4882a593Smuzhiyun return MAX8997_LDO_MAX_VAL;
21*4882a593Smuzhiyun ret = (uV - 800000) / 50000;
22*4882a593Smuzhiyun if (ret > MAX8997_LDO_MAX_VAL) {
23*4882a593Smuzhiyun printf("MAX8997 LDO SETTING ERROR (%duV) -> %u\n", uV, ret);
24*4882a593Smuzhiyun ret = MAX8997_LDO_MAX_VAL;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun return ret;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
pmic_charger_state(struct pmic * p,int state,int current)30*4882a593Smuzhiyun static int pmic_charger_state(struct pmic *p, int state, int current)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun unsigned char fc;
33*4882a593Smuzhiyun u32 val = 0;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun if (pmic_probe(p))
36*4882a593Smuzhiyun return -ENODEV;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun if (state == PMIC_CHARGER_DISABLE) {
39*4882a593Smuzhiyun puts("Disable the charger.\n");
40*4882a593Smuzhiyun pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
41*4882a593Smuzhiyun val &= ~(MBCHOSTEN | VCHGR_FC);
42*4882a593Smuzhiyun pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return -ENOTSUPP;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun if (current < CHARGER_MIN_CURRENT || current > CHARGER_MAX_CURRENT) {
48*4882a593Smuzhiyun printf("%s: Wrong charge current: %d [mA]\n",
49*4882a593Smuzhiyun __func__, current);
50*4882a593Smuzhiyun return -EINVAL;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun fc = (current - CHARGER_MIN_CURRENT) / CHARGER_CURRENT_RESOLUTION;
54*4882a593Smuzhiyun fc = fc & 0xf; /* up to 950 mA */
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun printf("Enable the charger @ %d [mA]\n", fc * CHARGER_CURRENT_RESOLUTION
57*4882a593Smuzhiyun + CHARGER_MIN_CURRENT);
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun val = fc | MBCICHFCSET;
60*4882a593Smuzhiyun pmic_reg_write(p, MAX8997_REG_MBCCTRL4, val);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
63*4882a593Smuzhiyun val = MBCHOSTEN | VCHGR_FC; /* enable charger & fast charge */
64*4882a593Smuzhiyun pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun return 0;
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun
pmic_charger_bat_present(struct pmic * p)69*4882a593Smuzhiyun static int pmic_charger_bat_present(struct pmic *p)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun u32 val;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun if (pmic_probe(p))
74*4882a593Smuzhiyun return -ENODEV;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun pmic_reg_read(p, MAX8997_REG_STATUS4, &val);
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun return !(val & DETBAT);
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun static struct power_chrg power_chrg_pmic_ops = {
82*4882a593Smuzhiyun .chrg_bat_present = pmic_charger_bat_present,
83*4882a593Smuzhiyun .chrg_state = pmic_charger_state,
84*4882a593Smuzhiyun };
85*4882a593Smuzhiyun
pmic_init(unsigned char bus)86*4882a593Smuzhiyun int pmic_init(unsigned char bus)
87*4882a593Smuzhiyun {
88*4882a593Smuzhiyun static const char name[] = "MAX8997_PMIC";
89*4882a593Smuzhiyun struct pmic *p = pmic_alloc();
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun if (!p) {
92*4882a593Smuzhiyun printf("%s: POWER allocation error!\n", __func__);
93*4882a593Smuzhiyun return -ENOMEM;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun debug("Board PMIC init\n");
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun p->name = name;
99*4882a593Smuzhiyun p->interface = PMIC_I2C;
100*4882a593Smuzhiyun p->number_of_regs = PMIC_NUM_OF_REGS;
101*4882a593Smuzhiyun p->hw.i2c.addr = MAX8997_I2C_ADDR;
102*4882a593Smuzhiyun p->hw.i2c.tx_num = 1;
103*4882a593Smuzhiyun p->bus = bus;
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun p->chrg = &power_chrg_pmic_ops;
106*4882a593Smuzhiyun return 0;
107*4882a593Smuzhiyun }
108