[PATCH 1/2] hw/misc: Add Infineon DPS310 sensor model

[Joel Stanley <joel@jms.id.au>]

This contains some hardcoded register values that were obtained from the
hardware after reading the temperature.

It does enough to test the Linux kernel driver.

Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 hw/misc/dps310.c    | 357 ++++++++++++++++++++++++++++++++++++++++++++
 hw/arm/Kconfig      |   1 +
 hw/misc/Kconfig     |   4 +
 hw/misc/meson.build |   1 +
 4 files changed, 363 insertions(+)
 create mode 100644 hw/misc/dps310.c

diff --git a/hw/misc/dps310.c b/hw/misc/dps310.c
new file mode 100644
index 000000000000..1fe1a1a645f2
--- /dev/null
+++ b/hw/misc/dps310.c
@@ -0,0 +1,357 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2017 Joel Stanley <joel@jms.id.au>, IBM Corporation
+ *
+ * Infineon DPS310 temperature and himidity 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   0x32
+
+typedef struct DPS310State {
+    /*< private >*/
+    I2CSlave i2c;
+
+    /*< public >*/
+    uint8_t regs[NUM_REGISTERS];
+
+    int16_t pressure, temperature;
+
+    uint8_t len;
+    uint8_t buf[2];
+    uint8_t pointer;
+
+} DPS310State;
+
+typedef struct DPS310Class {
+    I2CSlaveClass parent_class;
+} DPS310Class;
+
+#define TYPE_DPS310 "dps310"
+#define DPS310(obj) OBJECT_CHECK(DPS310State, (obj), TYPE_DPS310)
+
+#define DPS310_CLASS(klass) \
+     OBJECT_CLASS_CHECK(DPS310Class, (klass), TYPE_DPS310)
+#define DPS310_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(DPS310Class, (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   GENMASK(6, 4)
+#define DPS310_MEAS_CFG         0x08
+#define  DPS310_MEAS_CTRL_BITS  GENMASK(2, 0)
+#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);
+
+    memset(s->regs, 0, sizeof(s->regs));
+    s->pointer = 0;
+
+    s->regs[0x00] = 0xfe;
+    s->regs[0x01] = 0x2f;
+    s->regs[0x02] = 0xee;
+    s->regs[0x03] = 0x02;
+    s->regs[0x04] = 0x69;
+    s->regs[0x05] = 0xa6;
+    s->regs[0x06] = 0x00;
+    s->regs[0x07] = 0x80;
+    s->regs[0x08] = 0xc7;
+
+    s->regs[0x0d] = 0x10;
+    s->regs[0x0e] = 0x00;
+    s->regs[0x0f] = 0x00;
+    s->regs[0x10] = 0x0e;
+    s->regs[0x11] = 0x1e;
+    s->regs[0x12] = 0xdd;
+    s->regs[0x13] = 0x13;
+    s->regs[0x14] = 0xca;
+    s->regs[0x15] = 0x5f;
+    s->regs[0x16] = 0x21;
+    s->regs[0x17] = 0x52;
+    s->regs[0x18] = 0xf9;
+    s->regs[0x19] = 0xc6;
+    s->regs[0x1a] = 0x04;
+    s->regs[0x1b] = 0xd1;
+    s->regs[0x1c] = 0xdb;
+    s->regs[0x1d] = 0x47;
+    s->regs[0x1e] = 0x00;
+    s->regs[0x1f] = 0x5b;
+    s->regs[0x20] = 0xfb;
+    s->regs[0x21] = 0x3a;
+    s->regs[0x22] = 0x00;
+    s->regs[0x23] = 0x00;
+    s->regs[0x24] = 0x20;
+    s->regs[0x25] = 0x49;
+    s->regs[0x26] = 0x4e;
+    s->regs[0x27] = 0xa5;
+    s->regs[0x28] = 0x90;
+
+    s->regs[0x30] = 0x60;
+    s->regs[0x31] = 0x15;
+
+    /* TODO: assert these after some timeout ? */
+    s->regs[DPS310_MEAS_CFG] = DPS310_COEF_RDY | DPS310_SENSOR_RDY
+        | DPS310_TMP_RDY | DPS310_PRS_RDY;
+}
+
+static void dps310_get_pressure(Object *obj, Visitor *v, const char *name,
+                                   void *opaque, Error **errp)
+{
+    DPS310State *s = DPS310(obj);
+    int64_t value;
+
+    /* TODO */
+    value = s->pressure;
+
+    visit_type_int(v, name, &value, errp);
+}
+
+static void dps310_get_temperature(Object *obj, Visitor *v, const char *name,
+                                   void *opaque, Error **errp)
+{
+    DPS310State *s = DPS310(obj);
+    int64_t value;
+
+    /* TODO */
+    value = s->temperature;
+
+    visit_type_int(v, name, &value, errp);
+}
+
+static void dps310_set_temperature(Object *obj, Visitor *v, const char *name,
+                                   void *opaque, Error **errp)
+{
+    DPS310State *s = DPS310(obj);
+    Error *local_err = NULL;
+    int64_t temp;
+
+    visit_type_int(v, name, &temp, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    /* TODO */
+    if (temp >= 200 || temp < -100) {
+        error_setg(errp, "value %" PRId64 ".%03" PRIu64 " °C is out of range",
+                   temp / 1000, temp % 1000);
+        return;
+    }
+
+    s->temperature = temp;
+}
+
+static void dps310_set_pressure(Object *obj, Visitor *v, const char *name,
+                                   void *opaque, Error **errp)
+{
+    DPS310State *s = DPS310(obj);
+    Error *local_err = NULL;
+    int64_t pres;
+
+    visit_type_int(v, name, &pres, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    /* TODO */
+    if (pres >= 200 || pres < -100) {
+        error_setg(errp, "value %" PRId64 ".%03" PRIu64 " is out of range",
+                   pres / 1000, pres % 1000);
+        return;
+    }
+
+    s->pressure = pres;
+}
+
+static void dps310_read(DPS310State *s)
+{
+    /* Test should be >=, but we want to include register 0x32 */
+    if (s->pointer > sizeof(s->regs)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: register 0x%02x out of bounds\n",
+                      __func__, s->pointer);
+        return;
+    }
+
+    s->len = 0;
+
+    switch (s->pointer) {
+    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:
+        s->buf[s->len++] = s->regs[s->pointer];
+        break;
+    case 0x32:
+        /* Undocumented register to indicate workaround not required */
+        s->buf[s->len++] = 0x2;
+        break;
+    default:
+        qemu_log_mask(LOG_UNIMP, "%s: register 0x%02x unimplemented\n",
+                      __func__, s->pointer);
+        return;
+    }
+}
+
+static void dps310_write(DPS310State *s)
+{
+    if (s->pointer >= sizeof(s->regs)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: register %d out of bounds\n",
+                      __func__, s->pointer);
+        return;
+    }
+
+    switch (s->pointer) {
+    case DPS310_RESET:
+        if (s->buf[0] == DPS310_RESET_MAGIC) {
+            dps310_reset(DEVICE(s));
+        }
+        break;
+    case DPS310_PRS_CFG:
+    case DPS310_TMP_CFG:
+    case DPS310_MEAS_CFG:
+    case DPS310_CFG_REG:
+        s->regs[s->pointer] = s->buf[0];
+        break;
+    default:
+        qemu_log_mask(LOG_UNIMP, "%s: register 0x%02x unimplemented\n",
+                      __func__, s->pointer);
+        return;
+    }
+}
+
+static uint8_t dps310_rx(I2CSlave *i2c)
+{
+    DPS310State *s = DPS310(i2c);
+
+    if (s->len < 2) {
+        return s->buf[s->len++];
+    } 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) {
+        /*
+         * second byte is the data to write. The device only supports
+         * one byte writes
+         */
+        s->buf[0] = data;
+        dps310_write(s);
+    }
+
+    return 0;
+}
+
+static int dps310_event(I2CSlave *i2c, enum i2c_event event)
+{
+    DPS310State *s = DPS310(i2c);
+
+    if (event == I2C_START_RECV) {
+        dps310_read(s);
+    }
+
+    s->len = 0;
+    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(buf, DPS310State, 2),
+        VMSTATE_UINT8_ARRAY(regs, DPS310State, NUM_REGISTERS),
+        VMSTATE_UINT8(pointer, DPS310State),
+        VMSTATE_INT16(temperature, DPS310State),
+        VMSTATE_INT16(pressure, DPS310State),
+        VMSTATE_I2C_SLAVE(i2c, DPS310State),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void dps310_initfn(Object *obj)
+{
+    object_property_add(obj, "temperature", "int",
+                        dps310_get_temperature,
+                        dps310_set_temperature, NULL, NULL);
+    object_property_add(obj, "pressure", "int",
+                        dps310_get_pressure,
+                        dps310_set_pressure, NULL, NULL);
+}
+
+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),
+    .instance_init = dps310_initfn,
+    .class_init    = dps310_class_init,
+};
+
+static void dps310_register_types(void)
+{
+    type_register_static(&dps310_info);
+}
+
+type_init(dps310_register_types)
diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 67723d9ea6a8..62925845ebc1 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -410,6 +410,7 @@ config ASPEED_SOC
     select DS1338
     select FTGMAC100
     select I2C
+    select DPS310
     select PCA9552
     select SERIAL
     select SMBUS_EEPROM
diff --git a/hw/misc/Kconfig b/hw/misc/Kconfig
index c71ed2582046..016e34790e4f 100644
--- a/hw/misc/Kconfig
+++ b/hw/misc/Kconfig
@@ -49,6 +49,10 @@ config EDU
     default y if TEST_DEVICES
     depends on PCI && MSI_NONBROKEN
 
+config DPS310
+    bool
+    depends on I2C
+
 config PCA9552
     bool
     depends on I2C
diff --git a/hw/misc/meson.build b/hw/misc/meson.build
index 66e1648533e0..779d8b1582d3 100644
--- a/hw/misc/meson.build
+++ b/hw/misc/meson.build
@@ -1,4 +1,5 @@
 softmmu_ss.add(when: 'CONFIG_APPLESMC', if_true: files('applesmc.c'))
+softmmu_ss.add(when: 'CONFIG_DPS310', if_true: files('dps310.c'))
 softmmu_ss.add(when: 'CONFIG_EDU', if_true: files('edu.c'))
 softmmu_ss.add(when: 'CONFIG_FW_CFG_DMA', if_true: files('vmcoreinfo.c'))
 softmmu_ss.add(when: 'CONFIG_ISA_DEBUG', if_true: files('debugexit.c'))
-- 
2.30.2