drivers/power/mfd/pmic_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_pmic.h>
  11 #include <i2c.h>
  12 #include <errno.h>
  13
  14 static int max77693_charger_state(struct pmic *p, int state, int current)
  15 {
  16         unsigned int val;
  17
  18         if (pmic_probe(p))
  19                 return -1;
  20
  21         /* unlock write capability */
  22         val = MAX77693_CHG_UNLOCK;
  23         pmic_reg_write(p, MAX77693_CHG_CNFG_06, val);
  24
  25         if (state == PMIC_CHARGER_DISABLE) {
  26                 puts("Disable the charger.\n");
  27                 pmic_reg_read(p, MAX77693_CHG_CNFG_00, &val);
  28                 val &= ~0x01;
  29                 pmic_reg_write(p, MAX77693_CHG_CNFG_00, val);
  30                 return -1;
  31         }
  32
  33         if (current < CHARGER_MIN_CURRENT || current > CHARGER_MAX_CURRENT) {
  34                 printf("%s: Wrong charge current: %d [mA]\n",
  35                        __func__, current);
  36                 return -1;
  37         }
  38
  39         /* set charging current */
  40         pmic_reg_read(p, MAX77693_CHG_CNFG_02, &val);
  41         val &= ~MAX77693_CHG_CC;
  42         val |= current * 10 / 333;      /* 0.1A/3 steps */
  43         pmic_reg_write(p, MAX77693_CHG_CNFG_02, val);
  44
  45         /* enable charging */
  46         val = MAX77693_CHG_MODE_ON;
  47         pmic_reg_write(p, MAX77693_CHG_CNFG_00, val);
  48
  49         /* check charging current */
  50         pmic_reg_read(p, MAX77693_CHG_CNFG_02, &val);
  51         val &= 0x3f;
  52         printf("Enable the charger @ %d [mA]\n", val * 333 / 10);
  53
  54         return 0;
  55 }
  56
  57 static int max77693_charger_bat_present(struct pmic *p)
  58 {
  59         unsigned int val;
  60
  61         if (pmic_probe(p))
  62                 return -1;
  63
  64         pmic_reg_read(p, MAX77693_CHG_INT_OK, &val);
  65
  66         return !(val & MAX77693_CHG_DETBAT);
  67 }
  68
  69 static struct power_chrg power_chrg_pmic_ops = {
  70         .chrg_bat_present = max77693_charger_bat_present,
  71         .chrg_state = max77693_charger_state,
  72 };
  73
  74 int pmic_init_max77693(unsigned char bus)
  75 {
  76         static const char name[] = "MAX77693_PMIC";
  77         struct pmic *p = pmic_alloc();
  78
  79         if (!p) {
  80                 printf("%s: POWER allocation error!\n", __func__);
  81                 return -ENOMEM;
  82         }
  83
  84         debug("Board PMIC init\n");
  85
  86         p->name = name;
  87         p->interface = PMIC_I2C;
  88         p->number_of_regs = PMIC_NUM_OF_REGS;
  89         p->hw.i2c.addr = MAX77693_PMIC_I2C_ADDR;
  90         p->hw.i2c.tx_num = 1;
  91         p->bus = bus;
  92
  93         p->chrg = &power_chrg_pmic_ops;
  94
  95         return 0;
  96 }