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27#include "qemu/osdep.h"
28#include "hw/i2c/i2c.h"
29#include "migration/vmstate.h"
30#include "qapi/error.h"
31#include "qapi/visitor.h"
32#include "qemu/module.h"
33#include "qom/object.h"
34
35
36#define TMP421_MANUFACTURER_ID 0x55
37#define TMP421_DEVICE_ID 0x21
38#define TMP422_DEVICE_ID 0x22
39#define TMP423_DEVICE_ID 0x23
40
41typedef struct DeviceInfo {
42 int model;
43 const char *name;
44} DeviceInfo;
45
46static const DeviceInfo devices[] = {
47 { TMP421_DEVICE_ID, "tmp421" },
48 { TMP422_DEVICE_ID, "tmp422" },
49 { TMP423_DEVICE_ID, "tmp423" },
50};
51
52struct TMP421State {
53
54 I2CSlave i2c;
55
56
57 int16_t temperature[4];
58
59 uint8_t status;
60 uint8_t config[2];
61 uint8_t rate;
62
63 uint8_t len;
64 uint8_t buf[2];
65 uint8_t pointer;
66
67};
68
69struct TMP421Class {
70 I2CSlaveClass parent_class;
71 DeviceInfo *dev;
72};
73
74#define TYPE_TMP421 "tmp421-generic"
75OBJECT_DECLARE_TYPE(TMP421State, TMP421Class, TMP421)
76
77
78
79#define TMP421_STATUS_REG 0x08
80#define TMP421_STATUS_BUSY (1 << 7)
81#define TMP421_CONFIG_REG_1 0x09
82#define TMP421_CONFIG_RANGE (1 << 2)
83#define TMP421_CONFIG_SHUTDOWN (1 << 6)
84#define TMP421_CONFIG_REG_2 0x0A
85#define TMP421_CONFIG_RC (1 << 2)
86#define TMP421_CONFIG_LEN (1 << 3)
87#define TMP421_CONFIG_REN (1 << 4)
88#define TMP421_CONFIG_REN2 (1 << 5)
89#define TMP421_CONFIG_REN3 (1 << 6)
90
91#define TMP421_CONVERSION_RATE_REG 0x0B
92#define TMP421_ONE_SHOT 0x0F
93
94#define TMP421_RESET 0xFC
95#define TMP421_MANUFACTURER_ID_REG 0xFE
96#define TMP421_DEVICE_ID_REG 0xFF
97
98#define TMP421_TEMP_MSB0 0x00
99#define TMP421_TEMP_MSB1 0x01
100#define TMP421_TEMP_MSB2 0x02
101#define TMP421_TEMP_MSB3 0x03
102#define TMP421_TEMP_LSB0 0x10
103#define TMP421_TEMP_LSB1 0x11
104#define TMP421_TEMP_LSB2 0x12
105#define TMP421_TEMP_LSB3 0x13
106
107static const int32_t mins[2] = { -40000, -55000 };
108static const int32_t maxs[2] = { 127000, 150000 };
109
110static void tmp421_get_temperature(Object *obj, Visitor *v, const char *name,
111 void *opaque, Error **errp)
112{
113 TMP421State *s = TMP421(obj);
114 bool ext_range = (s->config[0] & TMP421_CONFIG_RANGE);
115 int offset = ext_range * 64 * 256;
116 int64_t value;
117 int tempid;
118
119 if (sscanf(name, "temperature%d", &tempid) != 1) {
120 error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
121 return;
122 }
123
124 if (tempid >= 4 || tempid < 0) {
125 error_setg(errp, "error reading %s", name);
126 return;
127 }
128
129 value = ((s->temperature[tempid] - offset) * 1000 + 128) / 256;
130
131 visit_type_int(v, name, &value, errp);
132}
133
134
135
136
137static void tmp421_set_temperature(Object *obj, Visitor *v, const char *name,
138 void *opaque, Error **errp)
139{
140 TMP421State *s = TMP421(obj);
141 int64_t temp;
142 bool ext_range = (s->config[0] & TMP421_CONFIG_RANGE);
143 int offset = ext_range * 64 * 256;
144 int tempid;
145
146 if (!visit_type_int(v, name, &temp, errp)) {
147 return;
148 }
149
150 if (temp >= maxs[ext_range] || temp < mins[ext_range]) {
151 error_setg(errp, "value %" PRId64 ".%03" PRIu64 " C is out of range",
152 temp / 1000, temp % 1000);
153 return;
154 }
155
156 if (sscanf(name, "temperature%d", &tempid) != 1) {
157 error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
158 return;
159 }
160
161 if (tempid >= 4 || tempid < 0) {
162 error_setg(errp, "error reading %s", name);
163 return;
164 }
165
166 s->temperature[tempid] = (int16_t) ((temp * 256 - 128) / 1000) + offset;
167}
168
169static void tmp421_read(TMP421State *s)
170{
171 TMP421Class *sc = TMP421_GET_CLASS(s);
172
173 s->len = 0;
174
175 switch (s->pointer) {
176 case TMP421_MANUFACTURER_ID_REG:
177 s->buf[s->len++] = TMP421_MANUFACTURER_ID;
178 break;
179 case TMP421_DEVICE_ID_REG:
180 s->buf[s->len++] = sc->dev->model;
181 break;
182 case TMP421_CONFIG_REG_1:
183 s->buf[s->len++] = s->config[0];
184 break;
185 case TMP421_CONFIG_REG_2:
186 s->buf[s->len++] = s->config[1];
187 break;
188 case TMP421_CONVERSION_RATE_REG:
189 s->buf[s->len++] = s->rate;
190 break;
191 case TMP421_STATUS_REG:
192 s->buf[s->len++] = s->status;
193 break;
194
195
196 case TMP421_TEMP_MSB0:
197 s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 8);
198 s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 0) & 0xf0;
199 break;
200 case TMP421_TEMP_MSB1:
201 s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 8);
202 s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 0) & 0xf0;
203 break;
204 case TMP421_TEMP_MSB2:
205 s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 8);
206 s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 0) & 0xf0;
207 break;
208 case TMP421_TEMP_MSB3:
209 s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 8);
210 s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 0) & 0xf0;
211 break;
212 case TMP421_TEMP_LSB0:
213 s->buf[s->len++] = (((uint16_t) s->temperature[0]) >> 0) & 0xf0;
214 break;
215 case TMP421_TEMP_LSB1:
216 s->buf[s->len++] = (((uint16_t) s->temperature[1]) >> 0) & 0xf0;
217 break;
218 case TMP421_TEMP_LSB2:
219 s->buf[s->len++] = (((uint16_t) s->temperature[2]) >> 0) & 0xf0;
220 break;
221 case TMP421_TEMP_LSB3:
222 s->buf[s->len++] = (((uint16_t) s->temperature[3]) >> 0) & 0xf0;
223 break;
224 }
225}
226
227static void tmp421_reset(I2CSlave *i2c);
228
229static void tmp421_write(TMP421State *s)
230{
231 switch (s->pointer) {
232 case TMP421_CONVERSION_RATE_REG:
233 s->rate = s->buf[0];
234 break;
235 case TMP421_CONFIG_REG_1:
236 s->config[0] = s->buf[0];
237 break;
238 case TMP421_CONFIG_REG_2:
239 s->config[1] = s->buf[0];
240 break;
241 case TMP421_RESET:
242 tmp421_reset(I2C_SLAVE(s));
243 break;
244 }
245}
246
247static uint8_t tmp421_rx(I2CSlave *i2c)
248{
249 TMP421State *s = TMP421(i2c);
250
251 if (s->len < 2) {
252 return s->buf[s->len++];
253 } else {
254 return 0xff;
255 }
256}
257
258static int tmp421_tx(I2CSlave *i2c, uint8_t data)
259{
260 TMP421State *s = TMP421(i2c);
261
262 if (s->len == 0) {
263
264
265 s->pointer = data;
266 s->len++;
267 } else if (s->len == 1) {
268
269
270 s->buf[0] = data;
271 tmp421_write(s);
272 }
273
274 return 0;
275}
276
277static int tmp421_event(I2CSlave *i2c, enum i2c_event event)
278{
279 TMP421State *s = TMP421(i2c);
280
281 if (event == I2C_START_RECV) {
282 tmp421_read(s);
283 }
284
285 s->len = 0;
286 return 0;
287}
288
289static const VMStateDescription vmstate_tmp421 = {
290 .name = "TMP421",
291 .version_id = 0,
292 .minimum_version_id = 0,
293 .fields = (VMStateField[]) {
294 VMSTATE_UINT8(len, TMP421State),
295 VMSTATE_UINT8_ARRAY(buf, TMP421State, 2),
296 VMSTATE_UINT8(pointer, TMP421State),
297 VMSTATE_UINT8_ARRAY(config, TMP421State, 2),
298 VMSTATE_UINT8(status, TMP421State),
299 VMSTATE_UINT8(rate, TMP421State),
300 VMSTATE_INT16_ARRAY(temperature, TMP421State, 4),
301 VMSTATE_I2C_SLAVE(i2c, TMP421State),
302 VMSTATE_END_OF_LIST()
303 }
304};
305
306static void tmp421_reset(I2CSlave *i2c)
307{
308 TMP421State *s = TMP421(i2c);
309 TMP421Class *sc = TMP421_GET_CLASS(s);
310
311 memset(s->temperature, 0, sizeof(s->temperature));
312 s->pointer = 0;
313
314 s->config[0] = 0;
315
316
317 switch (sc->dev->model) {
318 case TMP421_DEVICE_ID:
319 s->config[1] = 0x1c;
320 break;
321 case TMP422_DEVICE_ID:
322 s->config[1] = 0x3c;
323 break;
324 case TMP423_DEVICE_ID:
325 s->config[1] = 0x7c;
326 break;
327 }
328
329 s->rate = 0x7;
330 s->status = 0;
331}
332
333static void tmp421_realize(DeviceState *dev, Error **errp)
334{
335 TMP421State *s = TMP421(dev);
336
337 tmp421_reset(&s->i2c);
338}
339
340static void tmp421_class_init(ObjectClass *klass, void *data)
341{
342 DeviceClass *dc = DEVICE_CLASS(klass);
343 I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
344 TMP421Class *sc = TMP421_CLASS(klass);
345
346 dc->realize = tmp421_realize;
347 k->event = tmp421_event;
348 k->recv = tmp421_rx;
349 k->send = tmp421_tx;
350 dc->vmsd = &vmstate_tmp421;
351 sc->dev = (DeviceInfo *) data;
352
353 object_class_property_add(klass, "temperature0", "int",
354 tmp421_get_temperature,
355 tmp421_set_temperature, NULL, NULL);
356 object_class_property_add(klass, "temperature1", "int",
357 tmp421_get_temperature,
358 tmp421_set_temperature, NULL, NULL);
359 object_class_property_add(klass, "temperature2", "int",
360 tmp421_get_temperature,
361 tmp421_set_temperature, NULL, NULL);
362 object_class_property_add(klass, "temperature3", "int",
363 tmp421_get_temperature,
364 tmp421_set_temperature, NULL, NULL);
365}
366
367static const TypeInfo tmp421_info = {
368 .name = TYPE_TMP421,
369 .parent = TYPE_I2C_SLAVE,
370 .instance_size = sizeof(TMP421State),
371 .class_size = sizeof(TMP421Class),
372 .abstract = true,
373};
374
375static void tmp421_register_types(void)
376{
377 int i;
378
379 type_register_static(&tmp421_info);
380 for (i = 0; i < ARRAY_SIZE(devices); ++i) {
381 TypeInfo ti = {
382 .name = devices[i].name,
383 .parent = TYPE_TMP421,
384 .class_init = tmp421_class_init,
385 .class_data = (void *) &devices[i],
386 };
387 type_register(&ti);
388 }
389}
390
391type_init(tmp421_register_types)
392
