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27f92a378a
This adds the driver for the SB-TSI temp sensor. This is a sensor on the AMD AP SOC (Stoney Ridege FT2) that acts like an 8-pin temp sensor with an I2C interface. BUG=b:69379715 BRANCH=None TEST=Build Change-Id: Iaafe6c7beb3e02e4e341617e8f117c03c0a882a2 Signed-off-by: Alec Thilenius <athilenius@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/833346 Commit-Ready: Alec Thilenius <athilenius@google.com> Tested-by: Alec Thilenius <athilenius@google.com> Reviewed-by: Edward Hill <ecgh@chromium.org>
41 lines
992 B
C
41 lines
992 B
C
/* Copyright 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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/*
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* SB-TSI: SB Temperature Sensor Interface.
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* This is an I2C slave temp sensor on the AMD Stony Ridge FT4 SOC.
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*/
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#include "chipset.h"
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#include "common.h"
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#include "console.h"
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#include "gpio.h"
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#include "hooks.h"
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#include "i2c.h"
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#include "sb_tsi.h"
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#include "util.h"
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static int raw_read8(const int offset, int *data_ptr)
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{
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return i2c_read8(I2C_PORT_THERMAL, SB_TSI_I2C_ADDR, offset, data_ptr);
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}
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int sb_tsi_get_val(int idx, int *temp_ptr)
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{
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int ret;
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/* There is only one temp sensor on the FT4 */
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if (idx != 0)
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return EC_ERROR_PARAM1;
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/* FT4 SB-TSI sensor only powered in S0 */
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if (!chipset_in_state(CHIPSET_STATE_ON))
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return EC_ERROR_NOT_POWERED;
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/* Read the value over I2C */
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ret = raw_read8(SB_TSI_TEMP_H, temp_ptr);
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if (ret)
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return ret;
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*temp_ptr = C_TO_K(*temp_ptr);
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return EC_SUCCESS;
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}
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