tmp105: Create API for TMP105 temperature sensor.

* Define enum for TMP105 registers
* Move tmp105_set() from I2C to TMP105 header
* Document units and range of temperature as preconditions

Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alex Horn <alex.horn@cs.ox.ac.uk>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Alex Horn 2012-12-05 12:34:06 +00:00 committed by Anthony Liguori
parent eac236ea7b
commit 2915efbfa8
3 changed files with 76 additions and 11 deletions

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@ -73,9 +73,6 @@ void *wm8750_dac_buffer(void *opaque, int samples);
void wm8750_dac_commit(void *opaque);
void wm8750_set_bclk_in(void *opaque, int new_hz);
/* tmp105.c */
void tmp105_set(I2CSlave *i2c, int temp);
/* lm832x.c */
void lm832x_key_event(DeviceState *dev, int key, int state);

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@ -20,6 +20,7 @@
#include "hw.h"
#include "i2c.h"
#include "tmp105.h"
typedef struct {
I2CSlave i2c;
@ -92,22 +93,22 @@ static void tmp105_read(TMP105State *s)
}
switch (s->pointer & 3) {
case 0: /* Temperature */
case TMP105_REG_TEMPERATURE:
s->buf[s->len ++] = (((uint16_t) s->temperature) >> 8);
s->buf[s->len ++] = (((uint16_t) s->temperature) >> 0) &
(0xf0 << ((~s->config >> 5) & 3)); /* R */
break;
case 1: /* Configuration */
case TMP105_REG_CONFIG:
s->buf[s->len ++] = s->config;
break;
case 2: /* T_LOW */
case TMP105_REG_T_LOW:
s->buf[s->len ++] = ((uint16_t) s->limit[0]) >> 8;
s->buf[s->len ++] = ((uint16_t) s->limit[0]) >> 0;
break;
case 3: /* T_HIGH */
case TMP105_REG_T_HIGH:
s->buf[s->len ++] = ((uint16_t) s->limit[1]) >> 8;
s->buf[s->len ++] = ((uint16_t) s->limit[1]) >> 0;
break;
@ -117,10 +118,10 @@ static void tmp105_read(TMP105State *s)
static void tmp105_write(TMP105State *s)
{
switch (s->pointer & 3) {
case 0: /* Temperature */
case TMP105_REG_TEMPERATURE:
break;
case 1: /* Configuration */
case TMP105_REG_CONFIG:
if (s->buf[0] & ~s->config & (1 << 0)) /* SD */
printf("%s: TMP105 shutdown\n", __FUNCTION__);
s->config = s->buf[0];
@ -128,8 +129,8 @@ static void tmp105_write(TMP105State *s)
tmp105_alarm_update(s);
break;
case 2: /* T_LOW */
case 3: /* T_HIGH */
case TMP105_REG_T_LOW:
case TMP105_REG_T_HIGH:
if (s->len >= 3)
s->limit[s->pointer & 1] = (int16_t)
((((uint16_t) s->buf[0]) << 8) | s->buf[1]);

67
hw/tmp105.h Normal file
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@ -0,0 +1,67 @@
/*
* Texas Instruments TMP105 Temperature Sensor
*
* Browse the data sheet:
*
* http://www.ti.com/lit/gpn/tmp105
*
* Copyright (C) 2012 Alex Horn <alex.horn@cs.ox.ac.uk>
* Copyright (C) 2008-2012 Andrzej Zaborowski <balrogg@gmail.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*/
#ifndef QEMU_TMP105_H
#define QEMU_TMP105_H
#include "i2c.h"
/**
* TMP105Reg:
* @TMP105_REG_TEMPERATURE: Temperature register
* @TMP105_REG_CONFIG: Configuration register
* @TMP105_REG_T_LOW: Low temperature register (also known as T_hyst)
* @TMP105_REG_T_HIGH: High temperature register (also known as T_OS)
*
* The following temperature sensors are
* compatible with the TMP105 registers:
* - adt75
* - ds1775
* - ds75
* - lm75
* - lm75a
* - max6625
* - max6626
* - mcp980x
* - stds75
* - tcn75
* - tmp100
* - tmp101
* - tmp105
* - tmp175
* - tmp275
* - tmp75
**/
typedef enum TMP105Reg {
TMP105_REG_TEMPERATURE = 0,
TMP105_REG_CONFIG,
TMP105_REG_T_LOW,
TMP105_REG_T_HIGH,
} TMP105Reg;
/**
* 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