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73d0b9ca9f
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>
83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
/* Copyright (c) 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* TMP112 temperature sensor module for Chrome EC */
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#include "common.h"
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#include "console.h"
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#include "tmp112.h"
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#include "i2c.h"
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#include "hooks.h"
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#include "util.h"
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#define TMP112_RESOLUTION 12
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#define TMP112_SHIFT1 (16 - TMP112_RESOLUTION)
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#define TMP112_SHIFT2 (TMP112_RESOLUTION - 8)
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static int temp_val_local;
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static int raw_read16(const int offset, int *data_ptr)
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{
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return i2c_read16(I2C_PORT_THERMAL, TMP112_I2C_ADDR, offset, data_ptr);
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}
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static int raw_write16(const int offset, int data)
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{
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return i2c_write16(I2C_PORT_THERMAL, TMP112_I2C_ADDR, offset, data);
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}
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static int get_temp(int *temp_ptr)
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{
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int rv;
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int temp_raw = 0;
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rv = raw_read16(TMP112_REG_TEMP, &temp_raw);
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if (rv < 0)
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return rv;
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*temp_ptr = (int)(int16_t)temp_raw;
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return EC_SUCCESS;
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}
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static inline int tmp112_reg_to_c(int16_t reg)
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{
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int tmp;
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tmp = (((reg >> TMP112_SHIFT1) * 1000 ) >> TMP112_SHIFT2);
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return tmp / 1000;
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}
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int tmp112_get_val(int idx, int *temp_ptr)
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{
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*temp_ptr = temp_val_local;
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return EC_SUCCESS;
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}
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static void tmp112_poll(void)
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{
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int temp_c = 0;
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if (get_temp(&temp_c) == EC_SUCCESS)
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temp_val_local = C_TO_K(tmp112_reg_to_c(temp_c));
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}
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DECLARE_HOOK(HOOK_SECOND, tmp112_poll, HOOK_PRIO_TEMP_SENSOR);
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static void tmp112_init(void)
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{
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int tmp;
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int set_mask, clr_mask;
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/* 12 bit mode */
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set_mask = (3 << 5);
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/* not oneshot mode */
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clr_mask = (1 << 7);
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raw_read16(TMP112_REG_CONF, &tmp);
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raw_write16(TMP112_REG_CONF, (tmp & ~clr_mask) | set_mask);
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}
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DECLARE_HOOK(HOOK_INIT, tmp112_init, HOOK_PRIO_DEFAULT);
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