1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2013 Samsung Electronics
4 * Piotr Wilczek <p.wilczek@samsung.com>
5 */
6
7 #include <common.h>
8 #include <log.h>
9 #include <power/pmic.h>
10 #include <power/max77693_pmic.h>
11 #include <i2c.h>
12 #include <errno.h>
13
max77693_charger_state(struct pmic * p,int state,int current)14 static int max77693_charger_state(struct pmic *p, int state, int current)
15 {
16 unsigned int val;
17
18 if (pmic_probe(p))
19 return -ENODEV;
20
21 /* unlock write capability */
22 val = MAX77693_CHG_UNLOCK;
23 pmic_reg_write(p, MAX77693_CHG_CNFG_06, val);
24
25 if (state == PMIC_CHARGER_DISABLE) {
26 puts("Disable the charger.\n");
27 pmic_reg_read(p, MAX77693_CHG_CNFG_00, &val);
28 val &= ~0x01;
29 pmic_reg_write(p, MAX77693_CHG_CNFG_00, val);
30 return -ENOTSUPP;
31 }
32
33 if (current < CHARGER_MIN_CURRENT || current > CHARGER_MAX_CURRENT) {
34 printf("%s: Wrong charge current: %d [mA]\n",
35 __func__, current);
36 return -EINVAL;
37 }
38
39 /* set charging current */
40 pmic_reg_read(p, MAX77693_CHG_CNFG_02, &val);
41 val &= ~MAX77693_CHG_CC;
42 val |= current * 10 / 333; /* 0.1A/3 steps */
43 pmic_reg_write(p, MAX77693_CHG_CNFG_02, val);
44
45 /* enable charging */
46 val = MAX77693_CHG_MODE_ON;
47 pmic_reg_write(p, MAX77693_CHG_CNFG_00, val);
48
49 /* check charging current */
50 pmic_reg_read(p, MAX77693_CHG_CNFG_02, &val);
51 val &= 0x3f;
52 printf("Enable the charger @ %d [mA]\n", val * 333 / 10);
53
54 return 0;
55 }
56
max77693_charger_bat_present(struct pmic * p)57 static int max77693_charger_bat_present(struct pmic *p)
58 {
59 unsigned int val;
60
61 if (pmic_probe(p))
62 return -ENODEV;
63
64 pmic_reg_read(p, MAX77693_CHG_INT_OK, &val);
65
66 return !(val & MAX77693_CHG_DETBAT);
67 }
68
69 static struct power_chrg power_chrg_pmic_ops = {
70 .chrg_bat_present = max77693_charger_bat_present,
71 .chrg_state = max77693_charger_state,
72 };
73
pmic_init_max77693(unsigned char bus)74 int pmic_init_max77693(unsigned char bus)
75 {
76 static const char name[] = "MAX77693_PMIC";
77 struct pmic *p = pmic_alloc();
78
79 if (!p) {
80 printf("%s: POWER allocation error!\n", __func__);
81 return -ENOMEM;
82 }
83
84 debug("Board PMIC init\n");
85
86 p->name = name;
87 p->interface = PMIC_I2C;
88 p->number_of_regs = PMIC_NUM_OF_REGS;
89 p->hw.i2c.addr = MAX77693_PMIC_I2C_ADDR;
90 p->hw.i2c.tx_num = 1;
91 p->bus = bus;
92
93 p->chrg = &power_chrg_pmic_ops;
94
95 return 0;
96 }
97