| Piotr Wilczek | ca7e574 | 2013-09-24 16:31:22 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 Samsung Electronics |
| 3 | * Piotr Wilczek <p.wilczek@samsung.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 6 | */ |
| 7 | |
| 8 | #include <common.h> |
| 9 | #include <power/pmic.h> |
| 10 | #include <power/max77693_fg.h> |
| 11 | #include <i2c.h> |
| 12 | #include <power/power_chrg.h> |
| 13 | #include <power/battery.h> |
| 14 | #include <power/fg_battery_cell_params.h> |
| 15 | #include <errno.h> |
| 16 | |
| 17 | static int max77693_get_vcell(u32 *vcell) |
| 18 | { |
| 19 | u16 value; |
| 20 | u8 ret; |
| 21 | |
| 22 | ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VCELL, 1, |
| 23 | (u8 *)&value, 2); |
| 24 | if (ret) |
| 25 | return ret; |
| 26 | |
| 27 | *vcell = (u32)(value >> 3); |
| 28 | *vcell = *vcell * 625; |
| 29 | |
| 30 | return 0; |
| 31 | } |
| 32 | |
| 33 | static int max77693_get_soc(u32 *soc) |
| 34 | { |
| 35 | u16 value; |
| 36 | u8 ret; |
| 37 | |
| 38 | ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VFSOC, 1, |
| 39 | (u8 *)&value, 2); |
| 40 | if (ret) |
| 41 | return ret; |
| 42 | |
| 43 | *soc = (u32)(value >> 8); |
| 44 | |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | static int power_update_battery(struct pmic *p, struct pmic *bat) |
| 49 | { |
| 50 | struct power_battery *pb = bat->pbat; |
| 51 | int ret; |
| 52 | |
| 53 | if (pmic_probe(p)) { |
| 54 | puts("Can't find max77693 fuel gauge\n"); |
| 55 | return -1; |
| 56 | } |
| 57 | |
| 58 | ret = max77693_get_soc(&pb->bat->state_of_chrg); |
| 59 | if (ret) |
| 60 | return ret; |
| 61 | |
| 62 | max77693_get_vcell(&pb->bat->voltage_uV); |
| 63 | if (ret) |
| 64 | return ret; |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | static int power_check_battery(struct pmic *p, struct pmic *bat) |
| 70 | { |
| 71 | struct power_battery *pb = bat->pbat; |
| 72 | unsigned int val; |
| 73 | int ret = 0; |
| 74 | |
| 75 | if (pmic_probe(p)) { |
| 76 | puts("Can't find max77693 fuel gauge\n"); |
| 77 | return -1; |
| 78 | } |
| 79 | |
| 80 | ret = pmic_reg_read(p, MAX77693_STATUS, &val); |
| 81 | if (ret) |
| 82 | return ret; |
| 83 | debug("fg status: 0x%x\n", val); |
| 84 | |
| 85 | ret = pmic_reg_read(p, MAX77693_VERSION, &pb->bat->version); |
| 86 | if (ret) |
| 87 | return ret; |
| 88 | |
| 89 | ret = power_update_battery(p, bat); |
| 90 | if (ret) |
| 91 | return ret; |
| 92 | debug("fg ver: 0x%x\n", pb->bat->version); |
| 93 | printf("BAT: state_of_charge(SOC):%d%%\n", |
| 94 | pb->bat->state_of_chrg); |
| 95 | |
| 96 | printf(" voltage: %d.%6.6d [V] (expected to be %d [mAh])\n", |
| 97 | pb->bat->voltage_uV / 1000000, |
| 98 | pb->bat->voltage_uV % 1000000, |
| 99 | pb->bat->capacity); |
| 100 | |
| 101 | if (pb->bat->voltage_uV > 3850000) |
| 102 | pb->bat->state = EXT_SOURCE; |
| 103 | else if (pb->bat->voltage_uV < 3600000 || pb->bat->state_of_chrg < 5) |
| 104 | pb->bat->state = CHARGE; |
| 105 | else |
| 106 | pb->bat->state = NORMAL; |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static struct power_fg power_fg_ops = { |
| 112 | .fg_battery_check = power_check_battery, |
| 113 | .fg_battery_update = power_update_battery, |
| 114 | }; |
| 115 | |
| 116 | int power_fg_init(unsigned char bus) |
| 117 | { |
| 118 | static const char name[] = "MAX77693_FG"; |
| 119 | struct pmic *p = pmic_alloc(); |
| 120 | |
| 121 | if (!p) { |
| 122 | printf("%s: POWER allocation error!\n", __func__); |
| 123 | return -ENOMEM; |
| 124 | } |
| 125 | |
| 126 | debug("Board Fuel Gauge init\n"); |
| 127 | |
| 128 | p->name = name; |
| 129 | p->interface = PMIC_I2C; |
| 130 | p->number_of_regs = FG_NUM_OF_REGS; |
| 131 | p->hw.i2c.addr = MAX77693_FUEL_I2C_ADDR; |
| 132 | p->hw.i2c.tx_num = 2; |
| 133 | p->sensor_byte_order = PMIC_SENSOR_BYTE_ORDER_BIG; |
| 134 | p->bus = bus; |
| 135 | |
| 136 | p->fg = &power_fg_ops; |
| 137 | |
| 138 | return 0; |
| 139 | } |