hw/misc/emc141x.c

   1 /*
   2  * SMSC EMC141X temperature sensor.
   3  *
   4  * Copyright (c) 2020 Bytedance Corporation
   5  * Written by John Wang <wangzhiqiang.bj@bytedance.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 or
  10  * (at your option) version 3 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "hw/i2c/i2c.h"
  23 #include "migration/vmstate.h"
  24 #include "qapi/error.h"
  25 #include "qapi/visitor.h"
  26 #include "qemu/module.h"
  27 #include "qom/object.h"
  28 #include "hw/misc/emc141x_regs.h"
  29
  30 #define SENSORS_COUNT_MAX    4
  31
  32 struct EMC141XState {
  33     I2CSlave parent_obj;
  34     struct {
  35         uint8_t raw_temp_min;
  36         uint8_t raw_temp_current;
  37         uint8_t raw_temp_max;
  38     } sensor[SENSORS_COUNT_MAX];
  39     uint8_t len;
  40     uint8_t data;
  41     uint8_t pointer;
  42 };
  43
  44 struct EMC141XClass {
  45     I2CSlaveClass parent_class;
  46     uint8_t model;
  47     unsigned sensors_count;
  48 };
  49
  50 #define TYPE_EMC141X "emc141x"
  51 OBJECT_DECLARE_TYPE(EMC141XState, EMC141XClass, EMC141X)
  52
  53 static void emc141x_get_temperature(Object *obj, Visitor *v, const char *name,
  54                                     void *opaque, Error **errp)
  55 {
  56     EMC141XState *s = EMC141X(obj);
  57     EMC141XClass *sc = EMC141X_GET_CLASS(s);
  58     int64_t value;
  59     unsigned tempid;
  60
  61     if (sscanf(name, "temperature%u", &tempid) != 1) {
  62         error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
  63         return;
  64     }
  65
  66     if (tempid >= sc->sensors_count) {
  67         error_setg(errp, "error reading %s", name);
  68         return;
  69     }
  70
  71     value = s->sensor[tempid].raw_temp_current * 1000;
  72
  73     visit_type_int(v, name, &value, errp);
  74 }
  75
  76 static void emc141x_set_temperature(Object *obj, Visitor *v, const char *name,
  77                                     void *opaque, Error **errp)
  78 {
  79     EMC141XState *s = EMC141X(obj);
  80     EMC141XClass *sc = EMC141X_GET_CLASS(s);
  81     int64_t temp;
  82     unsigned tempid;
  83
  84     if (!visit_type_int(v, name, &temp, errp)) {
  85         return;
  86     }
  87
  88     if (sscanf(name, "temperature%u", &tempid) != 1) {
  89         error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
  90         return;
  91     }
  92
  93     if (tempid >= sc->sensors_count) {
  94         error_setg(errp, "error reading %s", name);
  95         return;
  96     }
  97
  98     s->sensor[tempid].raw_temp_current = temp / 1000;
  99 }
 100
 101 static void emc141x_read(EMC141XState *s)
 102 {
 103     EMC141XClass *sc = EMC141X_GET_CLASS(s);
 104     switch (s->pointer) {
 105     case EMC141X_DEVICE_ID:
 106         s->data = sc->model;
 107         break;
 108     case EMC141X_MANUFACTURER_ID:
 109         s->data = MANUFACTURER_ID;
 110         break;
 111     case EMC141X_REVISION:
 112         s->data = REVISION;
 113         break;
 114     case EMC141X_TEMP_HIGH0:
 115         s->data = s->sensor[0].raw_temp_current;
 116         break;
 117     case EMC141X_TEMP_HIGH1:
 118         s->data = s->sensor[1].raw_temp_current;
 119         break;
 120     case EMC141X_TEMP_HIGH2:
 121         s->data = s->sensor[2].raw_temp_current;
 122         break;
 123     case EMC141X_TEMP_HIGH3:
 124         s->data = s->sensor[3].raw_temp_current;
 125         break;
 126     case EMC141X_TEMP_MAX_HIGH0:
 127         s->data = s->sensor[0].raw_temp_max;
 128         break;
 129     case EMC141X_TEMP_MAX_HIGH1:
 130         s->data = s->sensor[1].raw_temp_max;
 131         break;
 132     case EMC141X_TEMP_MAX_HIGH2:
 133         s->data = s->sensor[2].raw_temp_max;
 134         break;
 135     case EMC141X_TEMP_MAX_HIGH3:
 136         s->data = s->sensor[3].raw_temp_max;
 137         break;
 138     case EMC141X_TEMP_MIN_HIGH0:
 139         s->data = s->sensor[0].raw_temp_min;
 140         break;
 141     case EMC141X_TEMP_MIN_HIGH1:
 142         s->data = s->sensor[1].raw_temp_min;
 143         break;
 144     case EMC141X_TEMP_MIN_HIGH2:
 145         s->data = s->sensor[2].raw_temp_min;
 146         break;
 147     case EMC141X_TEMP_MIN_HIGH3:
 148         s->data = s->sensor[3].raw_temp_min;
 149         break;
 150     default:
 151         s->data = 0;
 152     }
 153 }
 154
 155 static void emc141x_write(EMC141XState *s)
 156 {
 157     switch (s->pointer) {
 158     case EMC141X_TEMP_MAX_HIGH0:
 159         s->sensor[0].raw_temp_max = s->data;
 160         break;
 161     case EMC141X_TEMP_MAX_HIGH1:
 162         s->sensor[1].raw_temp_max = s->data;
 163         break;
 164     case EMC141X_TEMP_MAX_HIGH2:
 165         s->sensor[2].raw_temp_max = s->data;
 166         break;
 167     case EMC141X_TEMP_MAX_HIGH3:
 168         s->sensor[3].raw_temp_max = s->data;
 169         break;
 170     case EMC141X_TEMP_MIN_HIGH0:
 171         s->sensor[0].raw_temp_min = s->data;
 172         break;
 173     case EMC141X_TEMP_MIN_HIGH1:
 174         s->sensor[1].raw_temp_min = s->data;
 175         break;
 176     case EMC141X_TEMP_MIN_HIGH2:
 177         s->sensor[2].raw_temp_min = s->data;
 178         break;
 179     case EMC141X_TEMP_MIN_HIGH3:
 180         s->sensor[3].raw_temp_min = s->data;
 181         break;
 182     default:
 183         s->data = 0;
 184     }
 185 }
 186
 187 static uint8_t emc141x_rx(I2CSlave *i2c)
 188 {
 189     EMC141XState *s = EMC141X(i2c);
 190
 191     if (s->len == 0) {
 192         s->len++;
 193         return s->data;
 194     } else {
 195         return 0xff;
 196     }
 197 }
 198
 199 static int emc141x_tx(I2CSlave *i2c, uint8_t data)
 200 {
 201     EMC141XState *s = EMC141X(i2c);
 202
 203     if (s->len == 0) {
 204         /* first byte is the reg pointer */
 205         s->pointer = data;
 206         s->len++;
 207     } else if (s->len == 1) {
 208         s->data = data;
 209         emc141x_write(s);
 210     }
 211
 212     return 0;
 213 }
 214
 215 static int emc141x_event(I2CSlave *i2c, enum i2c_event event)
 216 {
 217     EMC141XState *s = EMC141X(i2c);
 218
 219     if (event == I2C_START_RECV) {
 220         emc141x_read(s);
 221     }
 222
 223     s->len = 0;
 224     return 0;
 225 }
 226
 227 static const VMStateDescription vmstate_emc141x = {
 228     .name = "EMC141X",
 229     .version_id = 0,
 230     .minimum_version_id = 0,
 231     .fields = (VMStateField[]) {
 232         VMSTATE_UINT8(len, EMC141XState),
 233         VMSTATE_UINT8(data, EMC141XState),
 234         VMSTATE_UINT8(pointer, EMC141XState),
 235         VMSTATE_I2C_SLAVE(parent_obj, EMC141XState),
 236         VMSTATE_END_OF_LIST()
 237     }
 238 };
 239
 240 static void emc141x_reset(DeviceState *dev)
 241 {
 242     EMC141XState *s = EMC141X(dev);
 243     int i;
 244
 245     for (i = 0; i < SENSORS_COUNT_MAX; i++) {
 246         s->sensor[i].raw_temp_max = 0x55;
 247     }
 248     s->pointer = 0;
 249     s->len = 0;
 250 }
 251
 252 static void emc141x_initfn(Object *obj)
 253 {
 254     object_property_add(obj, "temperature0", "int",
 255                         emc141x_get_temperature,
 256                         emc141x_set_temperature, NULL, NULL);
 257     object_property_add(obj, "temperature1", "int",
 258                         emc141x_get_temperature,
 259                         emc141x_set_temperature, NULL, NULL);
 260     object_property_add(obj, "temperature2", "int",
 261                         emc141x_get_temperature,
 262                         emc141x_set_temperature, NULL, NULL);
 263     object_property_add(obj, "temperature3", "int",
 264                         emc141x_get_temperature,
 265                         emc141x_set_temperature, NULL, NULL);
 266 }
 267
 268 static void emc141x_class_init(ObjectClass *klass, void *data)
 269 {
 270     DeviceClass *dc = DEVICE_CLASS(klass);
 271     I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
 272
 273     dc->reset = emc141x_reset;
 274     k->event = emc141x_event;
 275     k->recv = emc141x_rx;
 276     k->send = emc141x_tx;
 277     dc->vmsd = &vmstate_emc141x;
 278 }
 279
 280 static void emc1413_class_init(ObjectClass *klass, void *data)
 281 {
 282     EMC141XClass *ec = EMC141X_CLASS(klass);
 283
 284     emc141x_class_init(klass, data);
 285     ec->model = EMC1413_DEVICE_ID;
 286     ec->sensors_count = 3;
 287 }
 288
 289 static void emc1414_class_init(ObjectClass *klass, void *data)
 290 {
 291     EMC141XClass *ec = EMC141X_CLASS(klass);
 292
 293     emc141x_class_init(klass, data);
 294     ec->model = EMC1414_DEVICE_ID;
 295     ec->sensors_count = 4;
 296 }
 297
 298 static const TypeInfo emc141x_info = {
 299     .name          = TYPE_EMC141X,
 300     .parent        = TYPE_I2C_SLAVE,
 301     .instance_size = sizeof(EMC141XState),
 302     .class_size    = sizeof(EMC141XClass),
 303     .instance_init = emc141x_initfn,
 304     .abstract      = true,
 305 };
 306
 307 static const TypeInfo emc1413_info = {
 308     .name          = "emc1413",
 309     .parent        = TYPE_EMC141X,
 310     .class_init    = emc1413_class_init,
 311 };
 312
 313 static const TypeInfo emc1414_info = {
 314     .name          = "emc1414",
 315     .parent        = TYPE_EMC141X,
 316     .class_init    = emc1414_class_init,
 317 };
 318
 319 static void emc141x_register_types(void)
 320 {
 321     type_register_static(&emc141x_info);
 322     type_register_static(&emc1413_info);
 323     type_register_static(&emc1414_info);
 324 }
 325
 326 type_init(emc141x_register_types)