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