xref: /openbmc/u-boot/drivers/power/mfd/fg_max77693.c (revision d66ff4ba)
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 
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 
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 
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 
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 
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