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tmp105: Add temperature QOM property 

This obsoletes tmp105_set() and allows for better error handling.

Signed-off-by: Andreas Färber <andreas.faerber@web.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Andreas Färber 2013-01-16 01:57:59 +01:00 committed by Anthony Liguori
parent 2aad80eeb7
commit eb60d1c552
2 changed files with 30 additions and 21 deletions
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36
hw/tmp105.c
View File

@ -21,6 +21,7 @@
#include "hw.h"
#include "i2c.h"
#include "tmp105.h"
#include "qapi/visitor.h"
static void tmp105_interrupt_update(TMP105State *s)
{
@ -51,15 +52,30 @@ static void tmp105_alarm_update(TMP105State *s)
tmp105_interrupt_update(s);
}
/* Units are 0.001 centigrades relative to 0 C. */
void tmp105_set(I2CSlave *i2c, int temp)
static void tmp105_get_temperature(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
TMP105State *s = TMP105(i2c);
TMP105State *s = TMP105(obj);
int64_t value = s->temperature;
visit_type_int(v, &value, name, errp);
}
/* Units are 0.001 centigrades relative to 0 C. */
static void tmp105_set_temperature(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
TMP105State *s = TMP105(obj);
int64_t temp;
visit_type_int(v, &temp, name, errp);
if (error_is_set(errp)) {
return;
}
if (temp >= 128000 || temp < -128000) {
fprintf(stderr, "%s: values is out of range (%i.%03i C)\n",
__FUNCTION__, temp / 1000, temp % 1000);
exit(-1);
error_setg(errp, "value %" PRId64 ".%03" PRIu64 " °C is out of range",
temp / 1000, temp % 1000);
return;
}
s->temperature = ((int16_t) (temp * 0x800 / 128000)) << 4;
@ -218,6 +234,13 @@ static int tmp105_init(I2CSlave *i2c)
return 0;
}
static void tmp105_initfn(Object *obj)
{
object_property_add(obj, "temperature", "int",
tmp105_get_temperature,
tmp105_set_temperature, NULL, NULL, NULL);
}
static void tmp105_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
@ -234,6 +257,7 @@ static const TypeInfo tmp105_info = {
.name = TYPE_TMP105,
.parent = TYPE_I2C_SLAVE,
.instance_size = sizeof(TMP105State),
.instance_init = tmp105_initfn,
.class_init = tmp105_class_init,
};

15
hw/tmp105.h
View File

@ -44,19 +44,4 @@ typedef struct TMP105State {
uint8_t alarm;
} TMP105State;
/**
* tmp105_set:
* @i2c: dispatcher to TMP105 hardware model
* @temp: temperature with 0.001 centigrades units in the range -40 C to +125 C
*
* Sets the temperature of the TMP105 hardware model.
*
* Bits 5 and 6 (value 32 and 64) in the register indexed by TMP105_REG_CONFIG
* determine the precision of the temperature. See Table 8 in the data sheet.
*
* @see_also: I2C_SLAVE macro
* @see_also: http://www.ti.com/lit/gpn/tmp105
*/
void tmp105_set(I2CSlave *i2c, int temp);
#endif