1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2013 Samsung Electronics
3*4882a593Smuzhiyun * Piotr Wilczek <p.wilczek@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/max77693_pmic.h>
11*4882a593Smuzhiyun #include <i2c.h>
12*4882a593Smuzhiyun #include <errno.h>
13*4882a593Smuzhiyun
max77693_charger_state(struct pmic * p,int state,int current)14*4882a593Smuzhiyun static int max77693_charger_state(struct pmic *p, int state, int current)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun unsigned int val;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun if (pmic_probe(p))
19*4882a593Smuzhiyun return -ENODEV;
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun /* unlock write capability */
22*4882a593Smuzhiyun val = MAX77693_CHG_UNLOCK;
23*4882a593Smuzhiyun pmic_reg_write(p, MAX77693_CHG_CNFG_06, val);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun if (state == PMIC_CHARGER_DISABLE) {
26*4882a593Smuzhiyun puts("Disable the charger.\n");
27*4882a593Smuzhiyun pmic_reg_read(p, MAX77693_CHG_CNFG_00, &val);
28*4882a593Smuzhiyun val &= ~0x01;
29*4882a593Smuzhiyun pmic_reg_write(p, MAX77693_CHG_CNFG_00, val);
30*4882a593Smuzhiyun return -ENOTSUPP;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun if (current < CHARGER_MIN_CURRENT || current > CHARGER_MAX_CURRENT) {
34*4882a593Smuzhiyun printf("%s: Wrong charge current: %d [mA]\n",
35*4882a593Smuzhiyun __func__, current);
36*4882a593Smuzhiyun return -EINVAL;
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun /* set charging current */
40*4882a593Smuzhiyun pmic_reg_read(p, MAX77693_CHG_CNFG_02, &val);
41*4882a593Smuzhiyun val &= ~MAX77693_CHG_CC;
42*4882a593Smuzhiyun val |= current * 10 / 333; /* 0.1A/3 steps */
43*4882a593Smuzhiyun pmic_reg_write(p, MAX77693_CHG_CNFG_02, val);
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun /* enable charging */
46*4882a593Smuzhiyun val = MAX77693_CHG_MODE_ON;
47*4882a593Smuzhiyun pmic_reg_write(p, MAX77693_CHG_CNFG_00, val);
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun /* check charging current */
50*4882a593Smuzhiyun pmic_reg_read(p, MAX77693_CHG_CNFG_02, &val);
51*4882a593Smuzhiyun val &= 0x3f;
52*4882a593Smuzhiyun printf("Enable the charger @ %d [mA]\n", val * 333 / 10);
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun return 0;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
max77693_charger_bat_present(struct pmic * p)57*4882a593Smuzhiyun static int max77693_charger_bat_present(struct pmic *p)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun unsigned int val;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun if (pmic_probe(p))
62*4882a593Smuzhiyun return -ENODEV;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun pmic_reg_read(p, MAX77693_CHG_INT_OK, &val);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun return !(val & MAX77693_CHG_DETBAT);
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun static struct power_chrg power_chrg_pmic_ops = {
70*4882a593Smuzhiyun .chrg_bat_present = max77693_charger_bat_present,
71*4882a593Smuzhiyun .chrg_state = max77693_charger_state,
72*4882a593Smuzhiyun };
73*4882a593Smuzhiyun
pmic_init_max77693(unsigned char bus)74*4882a593Smuzhiyun int pmic_init_max77693(unsigned char bus)
75*4882a593Smuzhiyun {
76*4882a593Smuzhiyun static const char name[] = "MAX77693_PMIC";
77*4882a593Smuzhiyun struct pmic *p = pmic_alloc();
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun if (!p) {
80*4882a593Smuzhiyun printf("%s: POWER allocation error!\n", __func__);
81*4882a593Smuzhiyun return -ENOMEM;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun debug("Board PMIC init\n");
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun p->name = name;
87*4882a593Smuzhiyun p->interface = PMIC_I2C;
88*4882a593Smuzhiyun p->number_of_regs = PMIC_NUM_OF_REGS;
89*4882a593Smuzhiyun p->hw.i2c.addr = MAX77693_PMIC_I2C_ADDR;
90*4882a593Smuzhiyun p->hw.i2c.tx_num = 1;
91*4882a593Smuzhiyun p->bus = bus;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun p->chrg = &power_chrg_pmic_ops;
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun return 0;
96*4882a593Smuzhiyun }
97