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