drivers/power/mfd/fg_max77693.c

   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 }