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21#include "qemu/osdep.h"
22#include "hw/hw.h"
23#include "hw/i2c/i2c.h"
24#include "tmp105.h"
25#include "qapi/error.h"
26#include "qapi/visitor.h"
27
28static void tmp105_interrupt_update(TMP105State *s)
29{
30 qemu_set_irq(s->pin, s->alarm ^ ((~s->config >> 2) & 1));
31}
32
33static void tmp105_alarm_update(TMP105State *s)
34{
35 if ((s->config >> 0) & 1) {
36 if ((s->config >> 7) & 1)
37 s->config &= ~(1 << 7);
38 else
39 return;
40 }
41
42 if ((s->config >> 1) & 1) {
43 if (s->temperature >= s->limit[1])
44 s->alarm = 1;
45 else if (s->temperature < s->limit[0])
46 s->alarm = 1;
47 } else {
48 if (s->temperature >= s->limit[1])
49 s->alarm = 1;
50 else if (s->temperature < s->limit[0])
51 s->alarm = 0;
52 }
53
54 tmp105_interrupt_update(s);
55}
56
57static void tmp105_get_temperature(Object *obj, Visitor *v, const char *name,
58 void *opaque, Error **errp)
59{
60 TMP105State *s = TMP105(obj);
61 int64_t value = s->temperature * 1000 / 256;
62
63 visit_type_int(v, name, &value, errp);
64}
65
66
67
68
69static void tmp105_set_temperature(Object *obj, Visitor *v, const char *name,
70 void *opaque, Error **errp)
71{
72 TMP105State *s = TMP105(obj);
73 Error *local_err = NULL;
74 int64_t temp;
75
76 visit_type_int(v, name, &temp, &local_err);
77 if (local_err) {
78 error_propagate(errp, local_err);
79 return;
80 }
81 if (temp >= 128000 || temp < -128000) {
82 error_setg(errp, "value %" PRId64 ".%03" PRIu64 " °C is out of range",
83 temp / 1000, temp % 1000);
84 return;
85 }
86
87 s->temperature = (int16_t) (temp * 256 / 1000);
88
89 tmp105_alarm_update(s);
90}
91
92static const int tmp105_faultq[4] = { 1, 2, 4, 6 };
93
94static void tmp105_read(TMP105State *s)
95{
96 s->len = 0;
97
98 if ((s->config >> 1) & 1) {
99 s->alarm = 0;
100 tmp105_interrupt_update(s);
101 }
102
103 switch (s->pointer & 3) {
104 case TMP105_REG_TEMPERATURE:
105 s->buf[s->len ++] = (((uint16_t) s->temperature) >> 8);
106 s->buf[s->len ++] = (((uint16_t) s->temperature) >> 0) &
107 (0xf0 << ((~s->config >> 5) & 3));
108 break;
109
110 case TMP105_REG_CONFIG:
111 s->buf[s->len ++] = s->config;
112 break;
113
114 case TMP105_REG_T_LOW:
115 s->buf[s->len ++] = ((uint16_t) s->limit[0]) >> 8;
116 s->buf[s->len ++] = ((uint16_t) s->limit[0]) >> 0;
117 break;
118
119 case TMP105_REG_T_HIGH:
120 s->buf[s->len ++] = ((uint16_t) s->limit[1]) >> 8;
121 s->buf[s->len ++] = ((uint16_t) s->limit[1]) >> 0;
122 break;
123 }
124}
125
126static void tmp105_write(TMP105State *s)
127{
128 switch (s->pointer & 3) {
129 case TMP105_REG_TEMPERATURE:
130 break;
131
132 case TMP105_REG_CONFIG:
133 if (s->buf[0] & ~s->config & (1 << 0))
134 printf("%s: TMP105 shutdown\n", __FUNCTION__);
135 s->config = s->buf[0];
136 s->faults = tmp105_faultq[(s->config >> 3) & 3];
137 tmp105_alarm_update(s);
138 break;
139
140 case TMP105_REG_T_LOW:
141 case TMP105_REG_T_HIGH:
142 if (s->len >= 3)
143 s->limit[s->pointer & 1] = (int16_t)
144 ((((uint16_t) s->buf[0]) << 8) | s->buf[1]);
145 tmp105_alarm_update(s);
146 break;
147 }
148}
149
150static int tmp105_rx(I2CSlave *i2c)
151{
152 TMP105State *s = TMP105(i2c);
153
154 if (s->len < 2) {
155 return s->buf[s->len ++];
156 } else {
157 return 0xff;
158 }
159}
160
161static int tmp105_tx(I2CSlave *i2c, uint8_t data)
162{
163 TMP105State *s = TMP105(i2c);
164
165 if (s->len == 0) {
166 s->pointer = data;
167 s->len++;
168 } else {
169 if (s->len <= 2) {
170 s->buf[s->len - 1] = data;
171 }
172 s->len++;
173 tmp105_write(s);
174 }
175
176 return 0;
177}
178
179static void tmp105_event(I2CSlave *i2c, enum i2c_event event)
180{
181 TMP105State *s = TMP105(i2c);
182
183 if (event == I2C_START_RECV) {
184 tmp105_read(s);
185 }
186
187 s->len = 0;
188}
189
190static int tmp105_post_load(void *opaque, int version_id)
191{
192 TMP105State *s = opaque;
193
194 s->faults = tmp105_faultq[(s->config >> 3) & 3];
195
196 tmp105_interrupt_update(s);
197 return 0;
198}
199
200static const VMStateDescription vmstate_tmp105 = {
201 .name = "TMP105",
202 .version_id = 0,
203 .minimum_version_id = 0,
204 .post_load = tmp105_post_load,
205 .fields = (VMStateField[]) {
206 VMSTATE_UINT8(len, TMP105State),
207 VMSTATE_UINT8_ARRAY(buf, TMP105State, 2),
208 VMSTATE_UINT8(pointer, TMP105State),
209 VMSTATE_UINT8(config, TMP105State),
210 VMSTATE_INT16(temperature, TMP105State),
211 VMSTATE_INT16_ARRAY(limit, TMP105State, 2),
212 VMSTATE_UINT8(alarm, TMP105State),
213 VMSTATE_I2C_SLAVE(i2c, TMP105State),
214 VMSTATE_END_OF_LIST()
215 }
216};
217
218static void tmp105_reset(I2CSlave *i2c)
219{
220 TMP105State *s = TMP105(i2c);
221
222 s->temperature = 0;
223 s->pointer = 0;
224 s->config = 0;
225 s->faults = tmp105_faultq[(s->config >> 3) & 3];
226 s->alarm = 0;
227
228 tmp105_interrupt_update(s);
229}
230
231static int tmp105_init(I2CSlave *i2c)
232{
233 TMP105State *s = TMP105(i2c);
234
235 qdev_init_gpio_out(&i2c->qdev, &s->pin, 1);
236
237 tmp105_reset(&s->i2c);
238
239 return 0;
240}
241
242static void tmp105_initfn(Object *obj)
243{
244 object_property_add(obj, "temperature", "int",
245 tmp105_get_temperature,
246 tmp105_set_temperature, NULL, NULL, NULL);
247}
248
249static void tmp105_class_init(ObjectClass *klass, void *data)
250{
251 DeviceClass *dc = DEVICE_CLASS(klass);
252 I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
253
254 k->init = tmp105_init;
255 k->event = tmp105_event;
256 k->recv = tmp105_rx;
257 k->send = tmp105_tx;
258 dc->vmsd = &vmstate_tmp105;
259}
260
261static const TypeInfo tmp105_info = {
262 .name = TYPE_TMP105,
263 .parent = TYPE_I2C_SLAVE,
264 .instance_size = sizeof(TMP105State),
265 .instance_init = tmp105_initfn,
266 .class_init = tmp105_class_init,
267};
268
269static void tmp105_register_types(void)
270{
271 type_register_static(&tmp105_info);
272}
273
274type_init(tmp105_register_types)
275
