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_fg.h>
10 #include <i2c.h>
11 #include <power/power_chrg.h>
12 #include <power/battery.h>
13 #include <power/fg_battery_cell_params.h>
14 #include <errno.h>
15
max77693_get_vcell(u32 * vcell)16 static int max77693_get_vcell(u32 *vcell)
17 {
18 u16 value;
19 u8 ret;
20
21 ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VCELL, 1,
22 (u8 *)&value, 2);
23 if (ret)
24 return ret;
25
26 *vcell = (u32)(value >> 3);
27 *vcell = *vcell * 625;
28
29 return 0;
30 }
31
max77693_get_soc(u32 * soc)32 static int max77693_get_soc(u32 *soc)
33 {
34 u16 value;
35 u8 ret;
36
37 ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VFSOC, 1,
38 (u8 *)&value, 2);
39 if (ret)
40 return ret;
41
42 *soc = (u32)(value >> 8);
43
44 return 0;
45 }
46
power_update_battery(struct pmic * p,struct pmic * bat)47 static int power_update_battery(struct pmic *p, struct pmic *bat)
48 {
49 struct power_battery *pb = bat->pbat;
50 int ret;
51
52 if (pmic_probe(p)) {
53 puts("Can't find max77693 fuel gauge\n");
54 return -ENODEV;
55 }
56
57 ret = max77693_get_soc(&pb->bat->state_of_chrg);
58 if (ret)
59 return ret;
60
61 max77693_get_vcell(&pb->bat->voltage_uV);
62
63 return 0;
64 }
65
power_check_battery(struct pmic * p,struct pmic * bat)66 static int power_check_battery(struct pmic *p, struct pmic *bat)
67 {
68 struct power_battery *pb = bat->pbat;
69 unsigned int val;
70 int ret = 0;
71
72 if (pmic_probe(p)) {
73 puts("Can't find max77693 fuel gauge\n");
74 return -ENODEV;
75 }
76
77 ret = pmic_reg_read(p, MAX77693_STATUS, &val);
78 if (ret)
79 return ret;
80 debug("fg status: 0x%x\n", val);
81
82 ret = pmic_reg_read(p, MAX77693_VERSION, &pb->bat->version);
83 if (ret)
84 return ret;
85
86 ret = power_update_battery(p, bat);
87 if (ret)
88 return ret;
89 debug("fg ver: 0x%x\n", pb->bat->version);
90 printf("BAT: state_of_charge(SOC):%d%%\n",
91 pb->bat->state_of_chrg);
92
93 printf(" voltage: %d.%6.6d [V] (expected to be %d [mAh])\n",
94 pb->bat->voltage_uV / 1000000,
95 pb->bat->voltage_uV % 1000000,
96 pb->bat->capacity);
97
98 if (pb->bat->voltage_uV > 3850000)
99 pb->bat->state = EXT_SOURCE;
100 else if (pb->bat->voltage_uV < 3600000 || pb->bat->state_of_chrg < 5)
101 pb->bat->state = CHARGE;
102 else
103 pb->bat->state = NORMAL;
104
105 return 0;
106 }
107
108 static struct power_fg power_fg_ops = {
109 .fg_battery_check = power_check_battery,
110 .fg_battery_update = power_update_battery,
111 };
112
power_fg_init(unsigned char bus)113 int power_fg_init(unsigned char bus)
114 {
115 static const char name[] = "MAX77693_FG";
116 struct pmic *p = pmic_alloc();
117
118 if (!p) {
119 printf("%s: POWER allocation error!\n", __func__);
120 return -ENOMEM;
121 }
122
123 debug("Board Fuel Gauge init\n");
124
125 p->name = name;
126 p->interface = PMIC_I2C;
127 p->number_of_regs = FG_NUM_OF_REGS;
128 p->hw.i2c.addr = MAX77693_FUEL_I2C_ADDR;
129 p->hw.i2c.tx_num = 2;
130 p->sensor_byte_order = PMIC_SENSOR_BYTE_ORDER_BIG;
131 p->bus = bus;
132
133 p->fg = &power_fg_ops;
134
135 return 0;
136 }
137