| 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, const 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 | device_class_set_legacy_reset(dc, 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) |