drivers/power/mfd/fg_max77693.c

   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 <log.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 -ENODEV;
  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
  64         return 0;
  65 }
  66
  67 static int power_check_battery(struct pmic *p, struct pmic *bat)
  68 {
  69         struct power_battery *pb = bat->pbat;
  70         unsigned int val;
  71         int ret = 0;
  72
  73         if (pmic_probe(p)) {
  74                 puts("Can't find max77693 fuel gauge\n");
  75                 return -ENODEV;
  76         }
  77
  78         ret = pmic_reg_read(p, MAX77693_STATUS, &val);
  79         if (ret)
  80                 return ret;
  81         debug("fg status: 0x%x\n", val);
  82
  83         ret = pmic_reg_read(p, MAX77693_VERSION, &pb->bat->version);
  84         if (ret)
  85                 return ret;
  86
  87         ret = power_update_battery(p, bat);
  88         if (ret)
  89                 return ret;
  90         debug("fg ver: 0x%x\n", pb->bat->version);
  91         printf("BAT: state_of_charge(SOC):%d%%\n",
  92                pb->bat->state_of_chrg);
  93
  94         printf("     voltage: %d.%6.6d [V] (expected to be %d [mAh])\n",
  95                pb->bat->voltage_uV / 1000000,
  96                pb->bat->voltage_uV % 1000000,
  97                pb->bat->capacity);
  98
  99         if (pb->bat->voltage_uV > 3850000)
 100                 pb->bat->state = EXT_SOURCE;
 101         else if (pb->bat->voltage_uV < 3600000 || pb->bat->state_of_chrg < 5)
 102                 pb->bat->state = CHARGE;
 103         else
 104                 pb->bat->state = NORMAL;
 105
 106         return 0;
 107 }
 108
 109 static struct power_fg power_fg_ops = {
 110         .fg_battery_check = power_check_battery,
 111         .fg_battery_update = power_update_battery,
 112 };
 113
 114 int power_fg_init(unsigned char bus)
 115 {
 116         static const char name[] = "MAX77693_FG";
 117         struct pmic *p = pmic_alloc();
 118
 119         if (!p) {
 120                 printf("%s: POWER allocation error!\n", __func__);
 121                 return -ENOMEM;
 122         }
 123
 124         debug("Board Fuel Gauge init\n");
 125
 126         p->name = name;
 127         p->interface = PMIC_I2C;
 128         p->number_of_regs = FG_NUM_OF_REGS;
 129         p->hw.i2c.addr = MAX77693_FUEL_I2C_ADDR;
 130         p->hw.i2c.tx_num = 2;
 131         p->sensor_byte_order = PMIC_SENSOR_BYTE_ORDER_BIG;
 132         p->bus = bus;
 133
 134         p->fg = &power_fg_ops;
 135
 136         return 0;
 137 }