drivers/power/pmic/pmic_max8997.c

   1 /*
   2  *  Copyright (C) 2012 Samsung Electronics
   3  *  Lukasz Majewski <l.majewski@samsung.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <power/pmic.h>
  10 #include <power/max8997_pmic.h>
  11 #include <i2c.h>
  12 #include <errno.h>
  13
  14 unsigned char max8997_reg_ldo(int uV)
  15 {
  16         unsigned char ret;
  17         if (uV <= 800000)
  18                 return 0;
  19         if (uV >= 3950000)
  20                 return MAX8997_LDO_MAX_VAL;
  21         ret = (uV - 800000) / 50000;
  22         if (ret > MAX8997_LDO_MAX_VAL) {
  23                 printf("MAX8997 LDO SETTING ERROR (%duV) -> %u\n", uV, ret);
  24                 ret = MAX8997_LDO_MAX_VAL;
  25         }
  26
  27         return ret;
  28 }
  29
  30 static int pmic_charger_state(struct pmic *p, int state, int current)
  31 {
  32         unsigned char fc;
  33         u32 val = 0;
  34
  35         if (pmic_probe(p))
  36                 return -1;
  37
  38         if (state == CHARGER_DISABLE) {
  39                 puts("Disable the charger.\n");
  40                 pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
  41                 val &= ~(MBCHOSTEN | VCHGR_FC);
  42                 pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);
  43
  44                 return -1;
  45         }
  46
  47         if (current < CHARGER_MIN_CURRENT || current > CHARGER_MAX_CURRENT) {
  48                 printf("%s: Wrong charge current: %d [mA]\n",
  49                        __func__, current);
  50                 return -1;
  51         }
  52
  53         fc = (current - CHARGER_MIN_CURRENT) / CHARGER_CURRENT_RESOLUTION;
  54         fc = fc & 0xf; /* up to 950 mA */
  55
  56         printf("Enable the charger @ %d [mA]\n", fc * CHARGER_CURRENT_RESOLUTION
  57                + CHARGER_MIN_CURRENT);
  58
  59         val = fc | MBCICHFCSET;
  60         pmic_reg_write(p, MAX8997_REG_MBCCTRL4, val);
  61
  62         pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
  63         val = MBCHOSTEN | VCHGR_FC; /* enable charger & fast charge */
  64         pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);
  65
  66         return 0;
  67 }
  68
  69 static int pmic_charger_bat_present(struct pmic *p)
  70 {
  71         u32 val;
  72
  73         if (pmic_probe(p))
  74                 return -1;
  75
  76         pmic_reg_read(p, MAX8997_REG_STATUS4, &val);
  77
  78         return !(val & DETBAT);
  79 }
  80
  81 static struct power_chrg power_chrg_pmic_ops = {
  82         .chrg_bat_present = pmic_charger_bat_present,
  83         .chrg_state = pmic_charger_state,
  84 };
  85
  86 int pmic_init(unsigned char bus)
  87 {
  88         static const char name[] = "MAX8997_PMIC";
  89         struct pmic *p = pmic_alloc();
  90
  91         if (!p) {
  92                 printf("%s: POWER allocation error!\n", __func__);
  93                 return -ENOMEM;
  94         }
  95
  96         debug("Board PMIC init\n");
  97
  98         p->name = name;
  99         p->interface = PMIC_I2C;
 100         p->number_of_regs = PMIC_NUM_OF_REGS;
 101         p->hw.i2c.addr = MAX8997_I2C_ADDR;
 102         p->hw.i2c.tx_num = 1;
 103         p->bus = bus;
 104
 105         p->chrg = &power_chrg_pmic_ops;
 106         return 0;
 107 }