1 /* 2 * (C) Copyright 2012 3 * Henrik Nordstrom <henrik@henriknordstrom.net> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <i2c.h> 10 #include <axp209.h> 11 12 enum axp209_reg { 13 AXP209_POWER_STATUS = 0x00, 14 AXP209_CHIP_VERSION = 0x03, 15 AXP209_DCDC2_VOLTAGE = 0x23, 16 AXP209_DCDC3_VOLTAGE = 0x27, 17 AXP209_LDO24_VOLTAGE = 0x28, 18 AXP209_LDO3_VOLTAGE = 0x29, 19 AXP209_IRQ_STATUS5 = 0x4c, 20 AXP209_SHUTDOWN = 0x32, 21 }; 22 23 #define AXP209_POWER_STATUS_ON_BY_DC (1 << 0) 24 25 #define AXP209_IRQ5_PEK_UP (1 << 6) 26 #define AXP209_IRQ5_PEK_DOWN (1 << 5) 27 28 #define AXP209_POWEROFF (1 << 7) 29 30 static int axp209_write(enum axp209_reg reg, u8 val) 31 { 32 return i2c_write(0x34, reg, 1, &val, 1); 33 } 34 35 static int axp209_read(enum axp209_reg reg, u8 *val) 36 { 37 return i2c_read(0x34, reg, 1, val, 1); 38 } 39 40 static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div) 41 { 42 if (mvolt < min) 43 mvolt = min; 44 else if (mvolt > max) 45 mvolt = max; 46 47 return (mvolt - min) / div; 48 } 49 50 int axp209_set_dcdc2(int mvolt) 51 { 52 int rc; 53 u8 cfg, current; 54 55 cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25); 56 57 /* Do we really need to be this gentle? It has built-in voltage slope */ 58 while ((rc = axp209_read(AXP209_DCDC2_VOLTAGE, ¤t)) == 0 && 59 current != cfg) { 60 if (current < cfg) 61 current++; 62 else 63 current--; 64 65 rc = axp209_write(AXP209_DCDC2_VOLTAGE, current); 66 if (rc) 67 break; 68 } 69 70 return rc; 71 } 72 73 int axp209_set_dcdc3(int mvolt) 74 { 75 u8 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25); 76 77 return axp209_write(AXP209_DCDC3_VOLTAGE, cfg); 78 } 79 80 int axp209_set_ldo2(int mvolt) 81 { 82 int rc; 83 u8 cfg, reg; 84 85 cfg = axp209_mvolt_to_cfg(mvolt, 1800, 3300, 100); 86 87 rc = axp209_read(AXP209_LDO24_VOLTAGE, ®); 88 if (rc) 89 return rc; 90 91 /* LDO2 configuration is in upper 4 bits */ 92 reg = (reg & 0x0f) | (cfg << 4); 93 return axp209_write(AXP209_LDO24_VOLTAGE, reg); 94 } 95 96 int axp209_set_ldo3(int mvolt) 97 { 98 u8 cfg; 99 100 if (mvolt == -1) 101 cfg = 0x80; /* determined by LDO3IN pin */ 102 else 103 cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25); 104 105 return axp209_write(AXP209_LDO3_VOLTAGE, cfg); 106 } 107 108 int axp209_set_ldo4(int mvolt) 109 { 110 int rc; 111 static const int vindex[] = { 112 1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500, 113 2700, 2800, 3000, 3100, 3200, 3300 114 }; 115 u8 cfg, reg; 116 117 /* Translate mvolt to register cfg value, requested <= selected */ 118 for (cfg = 15; vindex[cfg] > mvolt && cfg > 0; cfg--); 119 120 rc = axp209_read(AXP209_LDO24_VOLTAGE, ®); 121 if (rc) 122 return rc; 123 124 /* LDO4 configuration is in lower 4 bits */ 125 reg = (reg & 0xf0) | (cfg << 0); 126 return axp209_write(AXP209_LDO24_VOLTAGE, reg); 127 } 128 129 int axp209_init(void) 130 { 131 u8 ver; 132 int rc; 133 134 rc = axp209_read(AXP209_CHIP_VERSION, &ver); 135 if (rc) 136 return rc; 137 138 /* Low 4 bits is chip version */ 139 ver &= 0x0f; 140 141 if (ver != 0x1) 142 return -1; 143 144 return 0; 145 } 146 147 int axp209_poweron_by_dc(void) 148 { 149 u8 v; 150 151 if (axp209_read(AXP209_POWER_STATUS, &v)) 152 return 0; 153 154 return (v & AXP209_POWER_STATUS_ON_BY_DC); 155 } 156 157 int axp209_power_button(void) 158 { 159 u8 v; 160 161 if (axp209_read(AXP209_IRQ_STATUS5, &v)) 162 return 0; 163 164 axp209_write(AXP209_IRQ_STATUS5, AXP209_IRQ5_PEK_DOWN); 165 166 return v & AXP209_IRQ5_PEK_DOWN; 167 } 168