LXR uboot/drivers/power/mfd/pmic

   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_pmic.h>
  11#include <i2c.h>
  12#include <errno.h>
  13
  14static int max77693_charger_state(struct pmic *p, int state, int current)
  15{
  16        unsigned int val;
  17
  18        if (pmic_probe(p))
  19                return -ENODEV;
  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 -ENOTSUPP;
  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 -EINVAL;
  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
  57static int max77693_charger_bat_present(struct pmic *p)
  58{
  59        unsigned int val;
  60
  61        if (pmic_probe(p))
  62                return -ENODEV;
  63
  64        pmic_reg_read(p, MAX77693_CHG_INT_OK, &val);
  65
  66        return !(val & MAX77693_CHG_DETBAT);
  67}
  68
  69static struct power_chrg power_chrg_pmic_ops = {
  70        .chrg_bat_present = max77693_charger_bat_present,
  71        .chrg_state = max77693_charger_state,
  72};
  73
  74int 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}
  97