/* * (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, 25); 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; }