drivers/power/axp152.c

   1 /*
   2  * (C) Copyright 2012
   3  * Henrik Nordstrom <henrik@henriknordstrom.net>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7 #include <common.h>
   8 #include <i2c.h>
   9 #include <axp152.h>
  10
  11 enum axp152_reg {
  12         AXP152_CHIP_VERSION = 0x3,
  13         AXP152_DCDC2_VOLTAGE = 0x23,
  14         AXP152_DCDC3_VOLTAGE = 0x27,
  15         AXP152_DCDC4_VOLTAGE = 0x2B,
  16         AXP152_LDO2_VOLTAGE = 0x2A,
  17         AXP152_SHUTDOWN = 0x32,
  18 };
  19
  20 #define AXP152_POWEROFF                 (1 << 7)
  21
  22 static int axp152_write(enum axp152_reg reg, u8 val)
  23 {
  24         return i2c_write(0x30, reg, 1, &val, 1);
  25 }
  26
  27 static int axp152_read(enum axp152_reg reg, u8 *val)
  28 {
  29         return i2c_read(0x30, reg, 1, val, 1);
  30 }
  31
  32 static u8 axp152_mvolt_to_target(int mvolt, int min, int max, int div)
  33 {
  34         if (mvolt < min)
  35                 mvolt = min;
  36         else if (mvolt > max)
  37                 mvolt = max;
  38
  39         return (mvolt - min) / div;
  40 }
  41
  42 int axp152_set_dcdc2(int mvolt)
  43 {
  44         int rc;
  45         u8 current, target;
  46
  47         target = axp152_mvolt_to_target(mvolt, 700, 2275, 25);
  48
  49         /* Do we really need to be this gentle? It has built-in voltage slope */
  50         while ((rc = axp152_read(AXP152_DCDC2_VOLTAGE, &current)) == 0 &&
  51                current != target) {
  52                 if (current < target)
  53                         current++;
  54                 else
  55                         current--;
  56                 rc = axp152_write(AXP152_DCDC2_VOLTAGE, current);
  57                 if (rc)
  58                         break;
  59         }
  60         return rc;
  61 }
  62
  63 int axp152_set_dcdc3(int mvolt)
  64 {
  65         u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 50);
  66
  67         return axp152_write(AXP152_DCDC3_VOLTAGE, target);
  68 }
  69
  70 int axp152_set_dcdc4(int mvolt)
  71 {
  72         u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);
  73
  74         return axp152_write(AXP152_DCDC4_VOLTAGE, target);
  75 }
  76
  77 int axp152_set_ldo2(int mvolt)
  78 {
  79         u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 100);
  80
  81         return axp152_write(AXP152_LDO2_VOLTAGE, target);
  82 }
  83
  84 int axp152_init(void)
  85 {
  86         u8 ver;
  87         int rc;
  88
  89         rc = axp152_read(AXP152_CHIP_VERSION, &ver);
  90         if (rc)
  91                 return rc;
  92
  93         if (ver != 0x05)
  94                 return -1;
  95
  96         return 0;
  97 }