1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  *  Copyright (C) 2012 Samsung Electronics
4  *  Lukasz Majewski <l.majewski@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