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-rw-r--r--hw/misc/tmp421.c402
1 files changed, 402 insertions, 0 deletions
diff --git a/hw/misc/tmp421.c b/hw/misc/tmp421.c
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--- /dev/null
+++ b/hw/misc/tmp421.c
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+/*
+ * Texas Instruments TMP421 temperature sensor.
+ *
+ * Copyright (c) 2016 IBM Corporation.
+ *
+ * Largely inspired by :
+ *
+ * Texas Instruments TMP105 temperature sensor.
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ * Written by Andrzej Zaborowski <andrew@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/hw.h"
+#include "hw/i2c/i2c.h"
+#include "qapi/error.h"
+#include "qapi/visitor.h"
+
+/* Manufacturer / Device ID's */
+#define TMP421_MANUFACTURER_ID 0x55
+#define TMP421_DEVICE_ID 0x21
+#define TMP422_DEVICE_ID 0x22
+#define TMP423_DEVICE_ID 0x23
+
+typedef struct DeviceInfo {
+ int model;
+ const char *name;
+} DeviceInfo;
+
+static const DeviceInfo devices[] = {
+ { TMP421_DEVICE_ID, "tmp421" },
+ { TMP422_DEVICE_ID, "tmp422" },
+ { TMP423_DEVICE_ID, "tmp423" },
+};
+
+typedef struct TMP421State {
+ /*< private >*/
+ I2CSlave i2c;
+ /*< public >*/
+
+ int16_t temperature[4];
+
+ uint8_t status;
+ uint8_t config[2];
+ uint8_t rate;
+
+ uint8_t len;
+ uint8_t buf[2];
+ uint8_t pointer;
+
+} TMP421State;
+
+typedef struct TMP421Class {
+ I2CSlaveClass parent_class;
+ DeviceInfo *dev;
+} TMP421Class;
+
+#define TYPE_TMP421 "tmp421-generic"
+#define TMP421(obj) OBJECT_CHECK(TMP421State, (obj), TYPE_TMP421)
+
+#define TMP421_CLASS(klass) \
+ OBJECT_CLASS_CHECK(TMP421Class, (klass), TYPE_TMP421)
+#define TMP421_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(TMP421Class, (obj), TYPE_TMP421)
+
+/* the TMP421 registers */
+#define TMP421_STATUS_REG 0x08
+#define TMP421_STATUS_BUSY (1 << 7)
+#define TMP421_CONFIG_REG_1 0x09
+#define TMP421_CONFIG_RANGE (1 << 2)
+#define TMP421_CONFIG_SHUTDOWN (1 << 6)
+#define TMP421_CONFIG_REG_2 0x0A
+#define TMP421_CONFIG_RC (1 << 2)
+#define TMP421_CONFIG_LEN (1 << 3)
+#define TMP421_CONFIG_REN (1 << 4)
+#define TMP421_CONFIG_REN2 (1 << 5)
+#define TMP421_CONFIG_REN3 (1 << 6)
+
+#define TMP421_CONVERSION_RATE_REG 0x0B
+#define TMP421_ONE_SHOT 0x0F
+
+#define TMP421_RESET 0xFC
+#define TMP421_MANUFACTURER_ID_REG 0xFE
+#define TMP421_DEVICE_ID_REG 0xFF
+
+#define TMP421_TEMP_MSB0 0x00
+#define TMP421_TEMP_MSB1 0x01
+#define TMP421_TEMP_MSB2 0x02
+#define TMP421_TEMP_MSB3 0x03
+#define TMP421_TEMP_LSB0 0x10
+#define TMP421_TEMP_LSB1 0x11
+#define TMP421_TEMP_LSB2 0x12
+#define TMP421_TEMP_LSB3 0x13
+
+static const int32_t mins[2] = { -40000, -55000 };
+static const int32_t maxs[2] = { 127000, 150000 };
+
+static void tmp421_get_temperature(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ TMP421State *s = TMP421(obj);
+ bool ext_range = (s->config[0] & TMP421_CONFIG_RANGE);
+ int offset = ext_range * 64 * 256;
+ int64_t value;
+ int tempid;
+
+ if (sscanf(name, "temperature%d", &tempid) != 1) {
+ error_setg(errp, "error reading %s: %m", name);
+ return;
+ }
+
+ if (tempid >= 4 || tempid < 0) {
+ error_setg(errp, "error reading %s", name);
+ return;
+ }
+
+ value = ((s->temperature[tempid] - offset) * 1000 + 128) / 256;
+
+ visit_type_int(v, name, &value, errp);
+}
+
+/* Units are 0.001 centigrades relative to 0 C. s->temperature is 8.8
+ * fixed point, so units are 1/256 centigrades. A simple ratio will do.
+ */
+static void tmp421_set_temperature(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ TMP421State *s = TMP421(obj);
+ Error *local_err = NULL;
+ int64_t temp;
+ bool ext_range = (s->config[0] & TMP421_CONFIG_RANGE);
+ int offset = ext_range * 64 * 256;
+ int tempid;
+
+ visit_type_int(v, name, &temp, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ if (temp >= maxs[ext_range] || temp < mins[ext_range]) {
+ error_setg(errp, "value %" PRId64 ".%03" PRIu64 " °C is out of range",
+ temp / 1000, temp % 1000);
+ return;
+ }
+
+ if (sscanf(name, "temperature%d", &tempid) != 1) {
+ error_setg(errp, "error reading %s: %m", name);
+ return;
+ }
+
+ if (tempid >= 4 || tempid < 0) {
+ error_setg(errp, "error reading %s", name);
+ return;
+ }
+
+ s->temperature[tempid] = (int16_t) ((temp * 256 - 128) / 1000) + offset;
+}
+
+static void tmp421_read(TMP421State *s)
+{
+ TMP421Class *sc = TMP421_GET_CLASS(s);
+
+ s->len = 0;
+
+ switch (s->pointer) {
+ case TMP421_MANUFACTURER_ID_REG:
+ s->buf[s->len++] = TMP421_MANUFACTURER_ID;
+ break;
+ case TMP421_DEVICE_ID_REG:
+ s->buf[s->len++] = sc->dev->model;
+ break;
+ case TMP421_CONFIG_REG_1:
+ s->buf[s->len++] = s->config[0];
+ break;
+ case TMP421_CONFIG_REG_2:
+ s->buf[s->len++] = s->config[1];
+ break;
+ case TMP421_CONVERSION_RATE_REG:
+ s->buf[s->len++] = s->rate;
+ break;
+ case TMP421_STATUS_REG:
+ s->buf[s->len++] = s->status;
+ break;
+
+ /* FIXME: check for channel enablement in config registers */
+ case TMP421_TEMP_MSB0:
+ s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 8);
+ s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 0) & 0xf0;
+ break;
+ case TMP421_TEMP_MSB1:
+ s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 8);
+ s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 0) & 0xf0;
+ break;
+ case TMP421_TEMP_MSB2:
+ s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 8);
+ s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 0) & 0xf0;
+ break;
+ case TMP421_TEMP_MSB3:
+ s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 8);
+ s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 0) & 0xf0;
+ break;
+ case TMP421_TEMP_LSB0:
+ s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 0) & 0xf0;
+ break;
+ case TMP421_TEMP_LSB1:
+ s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 0) & 0xf0;
+ break;
+ case TMP421_TEMP_LSB2:
+ s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 0) & 0xf0;
+ break;
+ case TMP421_TEMP_LSB3:
+ s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 0) & 0xf0;
+ break;
+ }
+}
+
+static void tmp421_reset(I2CSlave *i2c);
+
+static void tmp421_write(TMP421State *s)
+{
+ switch (s->pointer) {
+ case TMP421_CONVERSION_RATE_REG:
+ s->rate = s->buf[0];
+ break;
+ case TMP421_CONFIG_REG_1:
+ s->config[0] = s->buf[0];
+ break;
+ case TMP421_CONFIG_REG_2:
+ s->config[1] = s->buf[0];
+ break;
+ case TMP421_RESET:
+ tmp421_reset(I2C_SLAVE(s));
+ break;
+ }
+}
+
+static int tmp421_rx(I2CSlave *i2c)
+{
+ TMP421State *s = TMP421(i2c);
+
+ if (s->len < 2) {
+ return s->buf[s->len++];
+ } else {
+ return 0xff;
+ }
+}
+
+static int tmp421_tx(I2CSlave *i2c, uint8_t data)
+{
+ TMP421State *s = TMP421(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;
+ tmp421_write(s);
+ }
+
+ return 0;
+}
+
+static int tmp421_event(I2CSlave *i2c, enum i2c_event event)
+{
+ TMP421State *s = TMP421(i2c);
+
+ if (event == I2C_START_RECV) {
+ tmp421_read(s);
+ }
+
+ s->len = 0;
+ return 0;
+}
+
+static const VMStateDescription vmstate_tmp421 = {
+ .name = "TMP421",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8(len, TMP421State),
+ VMSTATE_UINT8_ARRAY(buf, TMP421State, 2),
+ VMSTATE_UINT8(pointer, TMP421State),
+ VMSTATE_UINT8_ARRAY(config, TMP421State, 2),
+ VMSTATE_UINT8(status, TMP421State),
+ VMSTATE_UINT8(rate, TMP421State),
+ VMSTATE_INT16_ARRAY(temperature, TMP421State, 4),
+ VMSTATE_I2C_SLAVE(i2c, TMP421State),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void tmp421_reset(I2CSlave *i2c)
+{
+ TMP421State *s = TMP421(i2c);
+ TMP421Class *sc = TMP421_GET_CLASS(s);
+
+ memset(s->temperature, 0, sizeof(s->temperature));
+ s->pointer = 0;
+
+ s->config[0] = 0; /* TMP421_CONFIG_RANGE */
+
+ /* resistance correction and channel enablement */
+ switch (sc->dev->model) {
+ case TMP421_DEVICE_ID:
+ s->config[1] = 0x1c;
+ break;
+ case TMP422_DEVICE_ID:
+ s->config[1] = 0x3c;
+ break;
+ case TMP423_DEVICE_ID:
+ s->config[1] = 0x7c;
+ break;
+ }
+
+ s->rate = 0x7; /* 8Hz */
+ s->status = 0;
+}
+
+static int tmp421_init(I2CSlave *i2c)
+{
+ TMP421State *s = TMP421(i2c);
+
+ tmp421_reset(&s->i2c);
+
+ return 0;
+}
+
+static void tmp421_initfn(Object *obj)
+{
+ object_property_add(obj, "temperature0", "int",
+ tmp421_get_temperature,
+ tmp421_set_temperature, NULL, NULL, NULL);
+ object_property_add(obj, "temperature1", "int",
+ tmp421_get_temperature,
+ tmp421_set_temperature, NULL, NULL, NULL);
+ object_property_add(obj, "temperature2", "int",
+ tmp421_get_temperature,
+ tmp421_set_temperature, NULL, NULL, NULL);
+ object_property_add(obj, "temperature3", "int",
+ tmp421_get_temperature,
+ tmp421_set_temperature, NULL, NULL, NULL);
+}
+
+static void tmp421_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
+ TMP421Class *sc = TMP421_CLASS(klass);
+
+ k->init = tmp421_init;
+ k->event = tmp421_event;
+ k->recv = tmp421_rx;
+ k->send = tmp421_tx;
+ dc->vmsd = &vmstate_tmp421;
+ sc->dev = (DeviceInfo *) data;
+}
+
+static const TypeInfo tmp421_info = {
+ .name = TYPE_TMP421,
+ .parent = TYPE_I2C_SLAVE,
+ .instance_size = sizeof(TMP421State),
+ .class_size = sizeof(TMP421Class),
+ .instance_init = tmp421_initfn,
+ .abstract = true,
+};
+
+static void tmp421_register_types(void)
+{
+ int i;
+
+ type_register_static(&tmp421_info);
+ for (i = 0; i < ARRAY_SIZE(devices); ++i) {
+ TypeInfo ti = {
+ .name = devices[i].name,
+ .parent = TYPE_TMP421,
+ .class_init = tmp421_class_init,
+ .class_data = (void *) &devices[i],
+ };
+ type_register(&ti);
+ }
+}
+
+type_init(tmp421_register_types)
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