1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2013 Samsung Electronics
3*4882a593Smuzhiyun * Piotr Wilczek <p.wilczek@samsung.com>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun #include <power/pmic.h>
10*4882a593Smuzhiyun #include <power/max77693_fg.h>
11*4882a593Smuzhiyun #include <i2c.h>
12*4882a593Smuzhiyun #include <power/power_chrg.h>
13*4882a593Smuzhiyun #include <power/battery.h>
14*4882a593Smuzhiyun #include <power/fg_battery_cell_params.h>
15*4882a593Smuzhiyun #include <errno.h>
16*4882a593Smuzhiyun
max77693_get_vcell(u32 * vcell)17*4882a593Smuzhiyun static int max77693_get_vcell(u32 *vcell)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun u16 value;
20*4882a593Smuzhiyun u8 ret;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VCELL, 1,
23*4882a593Smuzhiyun (u8 *)&value, 2);
24*4882a593Smuzhiyun if (ret)
25*4882a593Smuzhiyun return ret;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun *vcell = (u32)(value >> 3);
28*4882a593Smuzhiyun *vcell = *vcell * 625;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun return 0;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
max77693_get_soc(u32 * soc)33*4882a593Smuzhiyun static int max77693_get_soc(u32 *soc)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun u16 value;
36*4882a593Smuzhiyun u8 ret;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VFSOC, 1,
39*4882a593Smuzhiyun (u8 *)&value, 2);
40*4882a593Smuzhiyun if (ret)
41*4882a593Smuzhiyun return ret;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun *soc = (u32)(value >> 8);
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun return 0;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
power_update_battery(struct pmic * p,struct pmic * bat)48*4882a593Smuzhiyun static int power_update_battery(struct pmic *p, struct pmic *bat)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun struct power_battery *pb = bat->pbat;
51*4882a593Smuzhiyun int ret;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun if (pmic_probe(p)) {
54*4882a593Smuzhiyun puts("Can't find max77693 fuel gauge\n");
55*4882a593Smuzhiyun return -ENODEV;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun ret = max77693_get_soc(&pb->bat->state_of_chrg);
59*4882a593Smuzhiyun if (ret)
60*4882a593Smuzhiyun return ret;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun max77693_get_vcell(&pb->bat->voltage_uV);
63*4882a593Smuzhiyun if (ret)
64*4882a593Smuzhiyun return ret;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun return 0;
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun
power_check_battery(struct pmic * p,struct pmic * bat)69*4882a593Smuzhiyun static int power_check_battery(struct pmic *p, struct pmic *bat)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun struct power_battery *pb = bat->pbat;
72*4882a593Smuzhiyun unsigned int val;
73*4882a593Smuzhiyun int ret = 0;
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun if (pmic_probe(p)) {
76*4882a593Smuzhiyun puts("Can't find max77693 fuel gauge\n");
77*4882a593Smuzhiyun return -ENODEV;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun ret = pmic_reg_read(p, MAX77693_STATUS, &val);
81*4882a593Smuzhiyun if (ret)
82*4882a593Smuzhiyun return ret;
83*4882a593Smuzhiyun debug("fg status: 0x%x\n", val);
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun ret = pmic_reg_read(p, MAX77693_VERSION, &pb->bat->version);
86*4882a593Smuzhiyun if (ret)
87*4882a593Smuzhiyun return ret;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun ret = power_update_battery(p, bat);
90*4882a593Smuzhiyun if (ret)
91*4882a593Smuzhiyun return ret;
92*4882a593Smuzhiyun debug("fg ver: 0x%x\n", pb->bat->version);
93*4882a593Smuzhiyun printf("BAT: state_of_charge(SOC):%d%%\n",
94*4882a593Smuzhiyun pb->bat->state_of_chrg);
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun printf(" voltage: %d.%6.6d [V] (expected to be %d [mAh])\n",
97*4882a593Smuzhiyun pb->bat->voltage_uV / 1000000,
98*4882a593Smuzhiyun pb->bat->voltage_uV % 1000000,
99*4882a593Smuzhiyun pb->bat->capacity);
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun if (pb->bat->voltage_uV > 3850000)
102*4882a593Smuzhiyun pb->bat->state = EXT_SOURCE;
103*4882a593Smuzhiyun else if (pb->bat->voltage_uV < 3600000 || pb->bat->state_of_chrg < 5)
104*4882a593Smuzhiyun pb->bat->state = CHARGE;
105*4882a593Smuzhiyun else
106*4882a593Smuzhiyun pb->bat->state = NORMAL;
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun return 0;
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun static struct power_fg power_fg_ops = {
112*4882a593Smuzhiyun .fg_battery_check = power_check_battery,
113*4882a593Smuzhiyun .fg_battery_update = power_update_battery,
114*4882a593Smuzhiyun };
115*4882a593Smuzhiyun
power_fg_init(unsigned char bus)116*4882a593Smuzhiyun int power_fg_init(unsigned char bus)
117*4882a593Smuzhiyun {
118*4882a593Smuzhiyun static const char name[] = "MAX77693_FG";
119*4882a593Smuzhiyun struct pmic *p = pmic_alloc();
120*4882a593Smuzhiyun
121*4882a593Smuzhiyun if (!p) {
122*4882a593Smuzhiyun printf("%s: POWER allocation error!\n", __func__);
123*4882a593Smuzhiyun return -ENOMEM;
124*4882a593Smuzhiyun }
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun debug("Board Fuel Gauge init\n");
127*4882a593Smuzhiyun
128*4882a593Smuzhiyun p->name = name;
129*4882a593Smuzhiyun p->interface = PMIC_I2C;
130*4882a593Smuzhiyun p->number_of_regs = FG_NUM_OF_REGS;
131*4882a593Smuzhiyun p->hw.i2c.addr = MAX77693_FUEL_I2C_ADDR;
132*4882a593Smuzhiyun p->hw.i2c.tx_num = 2;
133*4882a593Smuzhiyun p->sensor_byte_order = PMIC_SENSOR_BYTE_ORDER_BIG;
134*4882a593Smuzhiyun p->bus = bus;
135*4882a593Smuzhiyun
136*4882a593Smuzhiyun p->fg = &power_fg_ops;
137*4882a593Smuzhiyun
138*4882a593Smuzhiyun return 0;
139*4882a593Smuzhiyun }
140