| /* |
| * (C) Copyright 2012 |
| * Henrik Nordstrom <henrik@henriknordstrom.net> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <i2c.h> |
| #include <axp209.h> |
| |
| enum axp209_reg { |
| AXP209_POWER_STATUS = 0x00, |
| AXP209_CHIP_VERSION = 0x03, |
| AXP209_DCDC2_VOLTAGE = 0x23, |
| AXP209_DCDC3_VOLTAGE = 0x27, |
| AXP209_LDO24_VOLTAGE = 0x28, |
| AXP209_LDO3_VOLTAGE = 0x29, |
| AXP209_IRQ_STATUS5 = 0x4c, |
| AXP209_SHUTDOWN = 0x32, |
| }; |
| |
| #define AXP209_POWER_STATUS_ON_BY_DC (1 << 0) |
| |
| #define AXP209_IRQ5_PEK_UP (1 << 6) |
| #define AXP209_IRQ5_PEK_DOWN (1 << 5) |
| |
| #define AXP209_POWEROFF (1 << 7) |
| |
| static int axp209_write(enum axp209_reg reg, u8 val) |
| { |
| return i2c_write(0x34, reg, 1, &val, 1); |
| } |
| |
| static int axp209_read(enum axp209_reg reg, u8 *val) |
| { |
| return i2c_read(0x34, reg, 1, val, 1); |
| } |
| |
| static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div) |
| { |
| if (mvolt < min) |
| mvolt = min; |
| else if (mvolt > max) |
| mvolt = max; |
| |
| return (mvolt - min) / div; |
| } |
| |
| int axp209_set_dcdc2(int mvolt) |
| { |
| int rc; |
| u8 cfg, current; |
| |
| cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25); |
| |
| /* Do we really need to be this gentle? It has built-in voltage slope */ |
| while ((rc = axp209_read(AXP209_DCDC2_VOLTAGE, ¤t)) == 0 && |
| current != cfg) { |
| if (current < cfg) |
| current++; |
| else |
| current--; |
| |
| rc = axp209_write(AXP209_DCDC2_VOLTAGE, current); |
| if (rc) |
| break; |
| } |
| |
| return rc; |
| } |
| |
| int axp209_set_dcdc3(int mvolt) |
| { |
| u8 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25); |
| |
| return axp209_write(AXP209_DCDC3_VOLTAGE, cfg); |
| } |
| |
| int axp209_set_ldo2(int mvolt) |
| { |
| int rc; |
| u8 cfg, reg; |
| |
| cfg = axp209_mvolt_to_cfg(mvolt, 1800, 3300, 100); |
| |
| rc = axp209_read(AXP209_LDO24_VOLTAGE, ®); |
| if (rc) |
| return rc; |
| |
| /* LDO2 configuration is in upper 4 bits */ |
| reg = (reg & 0x0f) | (cfg << 4); |
| return axp209_write(AXP209_LDO24_VOLTAGE, reg); |
| } |
| |
| int axp209_set_ldo3(int mvolt) |
| { |
| u8 cfg; |
| |
| if (mvolt == -1) |
| cfg = 0x80; /* determined by LDO3IN pin */ |
| else |
| cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25); |
| |
| return axp209_write(AXP209_LDO3_VOLTAGE, cfg); |
| } |
| |
| int axp209_set_ldo4(int mvolt) |
| { |
| int rc; |
| static const int vindex[] = { |
| 1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500, |
| 2700, 2800, 3000, 3100, 3200, 3300 |
| }; |
| u8 cfg, reg; |
| |
| /* Translate mvolt to register cfg value, requested <= selected */ |
| for (cfg = 15; vindex[cfg] > mvolt && cfg > 0; cfg--); |
| |
| rc = axp209_read(AXP209_LDO24_VOLTAGE, ®); |
| if (rc) |
| return rc; |
| |
| /* LDO4 configuration is in lower 4 bits */ |
| reg = (reg & 0xf0) | (cfg << 0); |
| return axp209_write(AXP209_LDO24_VOLTAGE, reg); |
| } |
| |
| int axp209_init(void) |
| { |
| u8 ver; |
| int rc; |
| |
| rc = axp209_read(AXP209_CHIP_VERSION, &ver); |
| if (rc) |
| return rc; |
| |
| /* Low 4 bits is chip version */ |
| ver &= 0x0f; |
| |
| if (ver != 0x1) |
| return -1; |
| |
| return 0; |
| } |
| |
| int axp209_poweron_by_dc(void) |
| { |
| u8 v; |
| |
| if (axp209_read(AXP209_POWER_STATUS, &v)) |
| return 0; |
| |
| return (v & AXP209_POWER_STATUS_ON_BY_DC); |
| } |
| |
| int axp209_power_button(void) |
| { |
| u8 v; |
| |
| if (axp209_read(AXP209_IRQ_STATUS5, &v)) |
| return 0; |
| |
| axp209_write(AXP209_IRQ_STATUS5, AXP209_IRQ5_PEK_DOWN); |
| |
| return v & AXP209_IRQ5_PEK_DOWN; |
| } |