scottk/OpenCellular
1
0
Fork 0
mirror of https://github.com/Telecominfraproject/OpenCellular.git synced 2026-01-10 01:21:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

driver: temp_sensor: Add support for TI TMP112 sensor

Browse Source 
Add support for the Texas Instruments TMP112 I2C temperature
sensor. The sensor provides a single temperature value.

BUG=none
BRANCH=none
TEST=Ran 'temp' console command over and over. Verified values with
    digital thermometer.

Change-Id: Ida4c082309d245c3f7c6282ecea74ce5af746e43
Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Reviewed-on: https://chromium-review.googlesource.com/418488
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Moritz Fischer
2016-12-06 09:25:33 -08:00
committed by chrome-bot
parent bf3f8ca53f
commit 73d0b9ca9f
3 changed files with 112 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
driver/build.mk
View File

@@ -74,6 +74,7 @@ driver-$(CONFIG_TEMP_SENSOR_G781)+=temp_sensor/g78x.o
driver-$(CONFIG_TEMP_SENSOR_G782)+=temp_sensor/g78x.o
driver-$(CONFIG_TEMP_SENSOR_TMP006)+=temp_sensor/tmp006.o
driver-$(CONFIG_TEMP_SENSOR_TMP432)+=temp_sensor/tmp432.o
driver-$(CONFIG_TEMP_SENSOR_TMP112)+=temp_sensor/tmp112.o
# Touchpads
driver-$(CONFIG_TOUCHPAD_ELAN)+=touchpad_elan.o

82
driver/temp_sensor/tmp112.c Normal file
View File

@@ -0,0 +1,82 @@
/* Copyright (c) 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* TMP112 temperature sensor module for Chrome EC */
#include "common.h"
#include "console.h"
#include "tmp112.h"
#include "i2c.h"
#include "hooks.h"
#include "util.h"
#define TMP112_RESOLUTION 12
#define TMP112_SHIFT1 (16 - TMP112_RESOLUTION)
#define TMP112_SHIFT2 (TMP112_RESOLUTION - 8)
static int temp_val_local;
static int raw_read16(const int offset, int *data_ptr)
{
return i2c_read16(I2C_PORT_THERMAL, TMP112_I2C_ADDR, offset, data_ptr);
}
static int raw_write16(const int offset, int data)
{
return i2c_write16(I2C_PORT_THERMAL, TMP112_I2C_ADDR, offset, data);
}
static int get_temp(int *temp_ptr)
{
int rv;
int temp_raw = 0;
rv = raw_read16(TMP112_REG_TEMP, &temp_raw);
if (rv < 0)
return rv;
*temp_ptr = (int)(int16_t)temp_raw;
return EC_SUCCESS;
}
static inline int tmp112_reg_to_c(int16_t reg)
{
int tmp;
tmp = (((reg >> TMP112_SHIFT1) * 1000 ) >> TMP112_SHIFT2);
return tmp / 1000;
}
int tmp112_get_val(int idx, int *temp_ptr)
{
*temp_ptr = temp_val_local;
return EC_SUCCESS;
}
static void tmp112_poll(void)
{
int temp_c = 0;
if (get_temp(&temp_c) == EC_SUCCESS)
temp_val_local = C_TO_K(tmp112_reg_to_c(temp_c));
}
DECLARE_HOOK(HOOK_SECOND, tmp112_poll, HOOK_PRIO_TEMP_SENSOR);
static void tmp112_init(void)
{
int tmp;
int set_mask, clr_mask;
/* 12 bit mode */
set_mask = (3 << 5);
/* not oneshot mode */
clr_mask = (1 << 7);
raw_read16(TMP112_REG_CONF, &tmp);
raw_write16(TMP112_REG_CONF, (tmp & ~clr_mask) | set_mask);
}
DECLARE_HOOK(HOOK_INIT, tmp112_init, HOOK_PRIO_DEFAULT);

29
driver/temp_sensor/tmp112.h Normal file
View File

@@ -0,0 +1,29 @@
/* Copyright (c) 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __CROS_EC_TMP112_H
#define __CROS_EC_TMP112_H
#include "i2c.h"
#define TMP112_I2C_ADDR 0x90 | I2C_FLAG_BIG_ENDIAN
#define TMP112_REG_TEMP 0x00
#define TMP112_REG_CONF 0x01
#define TMP112_REG_HYST 0x02
#define TMP112_REG_MAX 0x03
/**
* Get the last polled value of a sensor.
*
* @param idx Index to read. (Ignored)
*
* @param temp_ptr Destination for temperature in K.
*
* @return EC_SUCCESS if successful, non-zero if error.
*/
int tmp112_get_val(int idx, int *temp_ptr);
#endif /* __CROS_EC_TMP112_H */