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/*
* (C) Copyright 2012
* Henrik Nordstrom <henrik@henriknordstrom.net>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <i2c.h>
#include <axp152.h>
enum axp152_reg {
AXP152_CHIP_VERSION = 0x3,
AXP152_DCDC2_VOLTAGE = 0x23,
AXP152_DCDC3_VOLTAGE = 0x27,
AXP152_DCDC4_VOLTAGE = 0x2B,
AXP152_LDO2_VOLTAGE = 0x2A,
AXP152_SHUTDOWN = 0x32,
};
#define AXP152_POWEROFF (1 << 7)
static int axp152_write(enum axp152_reg reg, u8 val)
{
return i2c_write(0x30, reg, 1, &val, 1);
}
static int axp152_read(enum axp152_reg reg, u8 *val)
{
return i2c_read(0x30, reg, 1, val, 1);
}
static u8 axp152_mvolt_to_target(int mvolt, int min, int max, int div)
{
if (mvolt < min)
mvolt = min;
else if (mvolt > max)
mvolt = max;
return (mvolt - min) / div;
}
int axp152_set_dcdc2(int mvolt)
{
int rc;
u8 current, target;
target = axp152_mvolt_to_target(mvolt, 700, 2275, 25);
/* Do we really need to be this gentle? It has built-in voltage slope */
while ((rc = axp152_read(AXP152_DCDC2_VOLTAGE, ¤t)) == 0 &&
current != target) {
if (current < target)
current++;
else
current--;
rc = axp152_write(AXP152_DCDC2_VOLTAGE, current);
if (rc)
break;
}
return rc;
}
int axp152_set_dcdc3(int mvolt)
{
u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 50);
return axp152_write(AXP152_DCDC3_VOLTAGE, target);
}
int axp152_set_dcdc4(int mvolt)
{
u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);
return axp152_write(AXP152_DCDC4_VOLTAGE, target);
}
int axp152_set_ldo2(int mvolt)
{
u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 100);
return axp152_write(AXP152_LDO2_VOLTAGE, target);
}
int axp152_init(void)
{
u8 ver;
int rc;
rc = axp152_read(AXP152_CHIP_VERSION, &ver);
if (rc)
return rc;
if (ver != 0x05)
return -1;
return 0;
}
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