diff options
Diffstat (limited to 'hw/sensor/dps310.c')
| -rw-r--r-- | hw/sensor/dps310.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/hw/sensor/dps310.c b/hw/sensor/dps310.c new file mode 100644 index 0000000000..d60a18ac41 --- /dev/null +++ b/hw/sensor/dps310.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2017-2021 Joel Stanley <joel@jms.id.au>, IBM Corporation + * + * Infineon DPS310 temperature and humidity sensor + * + * https://www.infineon.com/cms/en/product/sensor/pressure-sensors/pressure-sensors-for-iot/dps310/ + */ + +#include "qemu/osdep.h" +#include "qemu/log.h" +#include "hw/hw.h" +#include "hw/i2c/i2c.h" +#include "qapi/error.h" +#include "qapi/visitor.h" +#include "migration/vmstate.h" + +#define NUM_REGISTERS 0x33 + +typedef struct DPS310State { + /*< private >*/ + I2CSlave i2c; + + /*< public >*/ + uint8_t regs[NUM_REGISTERS]; + + uint8_t len; + uint8_t pointer; + +} DPS310State; + +#define TYPE_DPS310 "dps310" +#define DPS310(obj) OBJECT_CHECK(DPS310State, (obj), TYPE_DPS310) + +#define DPS310_PRS_B2 0x00 +#define DPS310_PRS_B1 0x01 +#define DPS310_PRS_B0 0x02 +#define DPS310_TMP_B2 0x03 +#define DPS310_TMP_B1 0x04 +#define DPS310_TMP_B0 0x05 +#define DPS310_PRS_CFG 0x06 +#define DPS310_TMP_CFG 0x07 +#define DPS310_TMP_RATE_BITS (0x70) +#define DPS310_MEAS_CFG 0x08 +#define DPS310_MEAS_CTRL_BITS (0x07) +#define DPS310_PRESSURE_EN BIT(0) +#define DPS310_TEMP_EN BIT(1) +#define DPS310_BACKGROUND BIT(2) +#define DPS310_PRS_RDY BIT(4) +#define DPS310_TMP_RDY BIT(5) +#define DPS310_SENSOR_RDY BIT(6) +#define DPS310_COEF_RDY BIT(7) +#define DPS310_CFG_REG 0x09 +#define DPS310_RESET 0x0c +#define DPS310_RESET_MAGIC (BIT(0) | BIT(3)) +#define DPS310_COEF_BASE 0x10 +#define DPS310_COEF_LAST 0x21 +#define DPS310_COEF_SRC 0x28 + +static void dps310_reset(DeviceState *dev) +{ + DPS310State *s = DPS310(dev); + + static const uint8_t regs_reset_state[sizeof(s->regs)] = { + 0xfe, 0x2f, 0xee, 0x02, 0x69, 0xa6, 0x00, 0x80, 0xc7, 0x00, 0x00, 0x00, + 0x00, 0x10, 0x00, 0x00, 0x0e, 0x1e, 0xdd, 0x13, 0xca, 0x5f, 0x21, 0x52, + 0xf9, 0xc6, 0x04, 0xd1, 0xdb, 0x47, 0x00, 0x5b, 0xfb, 0x3a, 0x00, 0x00, + 0x20, 0x49, 0x4e, 0xa5, 0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x60, 0x15, 0x02 + }; + + memcpy(s->regs, regs_reset_state, sizeof(s->regs)); + s->pointer = 0; + + /* TODO: assert these after some timeout ? */ + s->regs[DPS310_MEAS_CFG] = DPS310_COEF_RDY | DPS310_SENSOR_RDY + | DPS310_TMP_RDY | DPS310_PRS_RDY; +} + +static uint8_t dps310_read(DPS310State *s, uint8_t reg) +{ + if (reg >= sizeof(s->regs)) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: register 0x%02x out of bounds\n", + __func__, s->pointer); + return 0xFF; + } + + switch (reg) { + case DPS310_PRS_B2: + case DPS310_PRS_B1: + case DPS310_PRS_B0: + case DPS310_TMP_B2: + case DPS310_TMP_B1: + case DPS310_TMP_B0: + case DPS310_PRS_CFG: + case DPS310_TMP_CFG: + case DPS310_MEAS_CFG: + case DPS310_CFG_REG: + case DPS310_COEF_BASE...DPS310_COEF_LAST: + case DPS310_COEF_SRC: + case 0x32: /* Undocumented register to indicate workaround not required */ + return s->regs[reg]; + default: + qemu_log_mask(LOG_UNIMP, "%s: register 0x%02x unimplemented\n", + __func__, reg); + return 0xFF; + } +} + +static void dps310_write(DPS310State *s, uint8_t reg, uint8_t data) +{ + if (reg >= sizeof(s->regs)) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: register %d out of bounds\n", + __func__, s->pointer); + return; + } + + switch (reg) { + case DPS310_RESET: + if (data == DPS310_RESET_MAGIC) { + device_cold_reset(DEVICE(s)); + } + break; + case DPS310_PRS_CFG: + case DPS310_TMP_CFG: + case DPS310_MEAS_CFG: + case DPS310_CFG_REG: + s->regs[reg] = data; + break; + default: + qemu_log_mask(LOG_UNIMP, "%s: register 0x%02x unimplemented\n", + __func__, reg); + return; + } +} + +static uint8_t dps310_rx(I2CSlave *i2c) +{ + DPS310State *s = DPS310(i2c); + + if (s->len == 1) { + return dps310_read(s, s->pointer++); + } else { + return 0xFF; + } +} + +static int dps310_tx(I2CSlave *i2c, uint8_t data) +{ + DPS310State *s = DPS310(i2c); + + if (s->len == 0) { + /* + * first byte is the register pointer for a read or write + * operation + */ + s->pointer = data; + s->len++; + } else if (s->len == 1) { + dps310_write(s, s->pointer++, data); + } + + return 0; +} + +static int dps310_event(I2CSlave *i2c, enum i2c_event event) +{ + DPS310State *s = DPS310(i2c); + + switch (event) { + case I2C_START_SEND: + s->pointer = 0xFF; + s->len = 0; + break; + case I2C_START_RECV: + if (s->len != 1) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid recv sequence\n", + __func__); + } + break; + default: + break; + } + + return 0; +} + +static const VMStateDescription vmstate_dps310 = { + .name = "DPS310", + .version_id = 0, + .minimum_version_id = 0, + .fields = (VMStateField[]) { + VMSTATE_UINT8(len, DPS310State), + VMSTATE_UINT8_ARRAY(regs, DPS310State, NUM_REGISTERS), + VMSTATE_UINT8(pointer, DPS310State), + VMSTATE_I2C_SLAVE(i2c, DPS310State), + VMSTATE_END_OF_LIST() + } +}; + +static void dps310_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + I2CSlaveClass *k = I2C_SLAVE_CLASS(klass); + + k->event = dps310_event; + k->recv = dps310_rx; + k->send = dps310_tx; + dc->reset = dps310_reset; + dc->vmsd = &vmstate_dps310; +} + +static const TypeInfo dps310_info = { + .name = TYPE_DPS310, + .parent = TYPE_I2C_SLAVE, + .instance_size = sizeof(DPS310State), + .class_init = dps310_class_init, +}; + +static void dps310_register_types(void) +{ + type_register_static(&dps310_info); +} + +type_init(dps310_register_types) |