1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2017-2021 Joel Stanley <joel@jms.id.au>, IBM Corporation 4 * 5 * Infineon DPS310 temperature and humidity sensor 6 * 7 * https://www.infineon.com/cms/en/product/sensor/pressure-sensors/pressure-sensors-for-iot/dps310/ 8 */ 9 10 #include "qemu/osdep.h" 11 #include "qemu/log.h" 12 #include "hw/i2c/i2c.h" 13 #include "qapi/error.h" 14 #include "qapi/visitor.h" 15 #include "migration/vmstate.h" 16 17 #define NUM_REGISTERS 0x33 18 19 typedef struct DPS310State { 20 /*< private >*/ 21 I2CSlave i2c; 22 23 /*< public >*/ 24 uint8_t regs[NUM_REGISTERS]; 25 26 uint8_t len; 27 uint8_t pointer; 28 29 } DPS310State; 30 31 #define TYPE_DPS310 "dps310" 32 #define DPS310(obj) OBJECT_CHECK(DPS310State, (obj), TYPE_DPS310) 33 34 #define DPS310_PRS_B2 0x00 35 #define DPS310_PRS_B1 0x01 36 #define DPS310_PRS_B0 0x02 37 #define DPS310_TMP_B2 0x03 38 #define DPS310_TMP_B1 0x04 39 #define DPS310_TMP_B0 0x05 40 #define DPS310_PRS_CFG 0x06 41 #define DPS310_TMP_CFG 0x07 42 #define DPS310_TMP_RATE_BITS (0x70) 43 #define DPS310_MEAS_CFG 0x08 44 #define DPS310_MEAS_CTRL_BITS (0x07) 45 #define DPS310_PRESSURE_EN BIT(0) 46 #define DPS310_TEMP_EN BIT(1) 47 #define DPS310_BACKGROUND BIT(2) 48 #define DPS310_PRS_RDY BIT(4) 49 #define DPS310_TMP_RDY BIT(5) 50 #define DPS310_SENSOR_RDY BIT(6) 51 #define DPS310_COEF_RDY BIT(7) 52 #define DPS310_CFG_REG 0x09 53 #define DPS310_RESET 0x0c 54 #define DPS310_RESET_MAGIC (BIT(0) | BIT(3)) 55 #define DPS310_COEF_BASE 0x10 56 #define DPS310_COEF_LAST 0x21 57 #define DPS310_COEF_SRC 0x28 58 59 static void dps310_reset(DeviceState *dev) 60 { 61 DPS310State *s = DPS310(dev); 62 63 static const uint8_t regs_reset_state[sizeof(s->regs)] = { 64 0xfe, 0x2f, 0xee, 0x02, 0x69, 0xa6, 0x00, 0x80, 0xc7, 0x00, 0x00, 0x00, 65 0x00, 0x10, 0x00, 0x00, 0x0e, 0x1e, 0xdd, 0x13, 0xca, 0x5f, 0x21, 0x52, 66 0xf9, 0xc6, 0x04, 0xd1, 0xdb, 0x47, 0x00, 0x5b, 0xfb, 0x3a, 0x00, 0x00, 67 0x20, 0x49, 0x4e, 0xa5, 0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 68 0x60, 0x15, 0x02 69 }; 70 71 memcpy(s->regs, regs_reset_state, sizeof(s->regs)); 72 s->pointer = 0; 73 74 /* TODO: assert these after some timeout ? */ 75 s->regs[DPS310_MEAS_CFG] = DPS310_COEF_RDY | DPS310_SENSOR_RDY 76 | DPS310_TMP_RDY | DPS310_PRS_RDY; 77 } 78 79 static uint8_t dps310_read(DPS310State *s, uint8_t reg) 80 { 81 if (reg >= sizeof(s->regs)) { 82 qemu_log_mask(LOG_GUEST_ERROR, "%s: register 0x%02x out of bounds\n", 83 __func__, s->pointer); 84 return 0xFF; 85 } 86 87 switch (reg) { 88 case DPS310_PRS_B2: 89 case DPS310_PRS_B1: 90 case DPS310_PRS_B0: 91 case DPS310_TMP_B2: 92 case DPS310_TMP_B1: 93 case DPS310_TMP_B0: 94 case DPS310_PRS_CFG: 95 case DPS310_TMP_CFG: 96 case DPS310_MEAS_CFG: 97 case DPS310_CFG_REG: 98 case DPS310_COEF_BASE...DPS310_COEF_LAST: 99 case DPS310_COEF_SRC: 100 case 0x32: /* Undocumented register to indicate workaround not required */ 101 return s->regs[reg]; 102 default: 103 qemu_log_mask(LOG_UNIMP, "%s: register 0x%02x unimplemented\n", 104 __func__, reg); 105 return 0xFF; 106 } 107 } 108 109 static void dps310_write(DPS310State *s, uint8_t reg, uint8_t data) 110 { 111 if (reg >= sizeof(s->regs)) { 112 qemu_log_mask(LOG_GUEST_ERROR, "%s: register %d out of bounds\n", 113 __func__, s->pointer); 114 return; 115 } 116 117 switch (reg) { 118 case DPS310_RESET: 119 if (data == DPS310_RESET_MAGIC) { 120 device_cold_reset(DEVICE(s)); 121 } 122 break; 123 case DPS310_PRS_CFG: 124 case DPS310_TMP_CFG: 125 case DPS310_MEAS_CFG: 126 case DPS310_CFG_REG: 127 s->regs[reg] = data; 128 break; 129 default: 130 qemu_log_mask(LOG_UNIMP, "%s: register 0x%02x unimplemented\n", 131 __func__, reg); 132 return; 133 } 134 } 135 136 static uint8_t dps310_rx(I2CSlave *i2c) 137 { 138 DPS310State *s = DPS310(i2c); 139 140 if (s->len == 1) { 141 return dps310_read(s, s->pointer++); 142 } else { 143 return 0xFF; 144 } 145 } 146 147 static int dps310_tx(I2CSlave *i2c, uint8_t data) 148 { 149 DPS310State *s = DPS310(i2c); 150 151 if (s->len == 0) { 152 /* 153 * first byte is the register pointer for a read or write 154 * operation 155 */ 156 s->pointer = data; 157 s->len++; 158 } else if (s->len == 1) { 159 dps310_write(s, s->pointer++, data); 160 } 161 162 return 0; 163 } 164 165 static int dps310_event(I2CSlave *i2c, enum i2c_event event) 166 { 167 DPS310State *s = DPS310(i2c); 168 169 switch (event) { 170 case I2C_START_SEND: 171 s->pointer = 0xFF; 172 s->len = 0; 173 break; 174 case I2C_START_RECV: 175 if (s->len != 1) { 176 qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid recv sequence\n", 177 __func__); 178 } 179 break; 180 default: 181 break; 182 } 183 184 return 0; 185 } 186 187 static const VMStateDescription vmstate_dps310 = { 188 .name = "DPS310", 189 .version_id = 0, 190 .minimum_version_id = 0, 191 .fields = (const VMStateField[]) { 192 VMSTATE_UINT8(len, DPS310State), 193 VMSTATE_UINT8_ARRAY(regs, DPS310State, NUM_REGISTERS), 194 VMSTATE_UINT8(pointer, DPS310State), 195 VMSTATE_I2C_SLAVE(i2c, DPS310State), 196 VMSTATE_END_OF_LIST() 197 } 198 }; 199 200 static void dps310_class_init(ObjectClass *klass, void *data) 201 { 202 DeviceClass *dc = DEVICE_CLASS(klass); 203 I2CSlaveClass *k = I2C_SLAVE_CLASS(klass); 204 205 k->event = dps310_event; 206 k->recv = dps310_rx; 207 k->send = dps310_tx; 208 dc->reset = dps310_reset; 209 dc->vmsd = &vmstate_dps310; 210 } 211 212 static const TypeInfo dps310_info = { 213 .name = TYPE_DPS310, 214 .parent = TYPE_I2C_SLAVE, 215 .instance_size = sizeof(DPS310State), 216 .class_init = dps310_class_init, 217 }; 218 219 static void dps310_register_types(void) 220 { 221 type_register_static(&dps310_info); 222 } 223 224 type_init(dps310_register_types) 225