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