drivers/power/mfd/pmic_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 <power/pmic.h>
   9 #include <power/max77693_pmic.h>
  10 #include <i2c.h>
  11 #include <errno.h>
  12
  13 static int max77693_charger_state(struct pmic *p, int state, int current)
  14 {
  15         unsigned int val;
  16
  17         if (pmic_probe(p))
  18                 return -ENODEV;
  19
  20         /* unlock write capability */
  21         val = MAX77693_CHG_UNLOCK;
  22         pmic_reg_write(p, MAX77693_CHG_CNFG_06, val);
  23
  24         if (state == PMIC_CHARGER_DISABLE) {
  25                 puts("Disable the charger.\n");
  26                 pmic_reg_read(p, MAX77693_CHG_CNFG_00, &val);
  27                 val &= ~0x01;
  28                 pmic_reg_write(p, MAX77693_CHG_CNFG_00, val);
  29                 return -ENOTSUPP;
  30         }
  31
  32         if (current < CHARGER_MIN_CURRENT || current > CHARGER_MAX_CURRENT) {
  33                 printf("%s: Wrong charge current: %d [mA]\n",
  34                        __func__, current);
  35                 return -EINVAL;
  36         }
  37
  38         /* set charging current */
  39         pmic_reg_read(p, MAX77693_CHG_CNFG_02, &val);
  40         val &= ~MAX77693_CHG_CC;
  41         val |= current * 10 / 333;      /* 0.1A/3 steps */
  42         pmic_reg_write(p, MAX77693_CHG_CNFG_02, val);
  43
  44         /* enable charging */
  45         val = MAX77693_CHG_MODE_ON;
  46         pmic_reg_write(p, MAX77693_CHG_CNFG_00, val);
  47
  48         /* check charging current */
  49         pmic_reg_read(p, MAX77693_CHG_CNFG_02, &val);
  50         val &= 0x3f;
  51         printf("Enable the charger @ %d [mA]\n", val * 333 / 10);
  52
  53         return 0;
  54 }
  55
  56 static int max77693_charger_bat_present(struct pmic *p)
  57 {
  58         unsigned int val;
  59
  60         if (pmic_probe(p))
  61                 return -ENODEV;
  62
  63         pmic_reg_read(p, MAX77693_CHG_INT_OK, &val);
  64
  65         return !(val & MAX77693_CHG_DETBAT);
  66 }
  67
  68 static struct power_chrg power_chrg_pmic_ops = {
  69         .chrg_bat_present = max77693_charger_bat_present,
  70         .chrg_state = max77693_charger_state,
  71 };
  72
  73 int pmic_init_max77693(unsigned char bus)
  74 {
  75         static const char name[] = "MAX77693_PMIC";
  76         struct pmic *p = pmic_alloc();
  77
  78         if (!p) {
  79                 printf("%s: POWER allocation error!\n", __func__);
  80                 return -ENOMEM;
  81         }
  82
  83         debug("Board PMIC init\n");
  84
  85         p->name = name;
  86         p->interface = PMIC_I2C;
  87         p->number_of_regs = PMIC_NUM_OF_REGS;
  88         p->hw.i2c.addr = MAX77693_PMIC_I2C_ADDR;
  89         p->hw.i2c.tx_num = 1;
  90         p->bus = bus;
  91
  92         p->chrg = &power_chrg_pmic_ops;
  93
  94         return 0;
  95 }