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The TSENS controller in 8996 family of SoCs is capable of converting the ADC code outputs to real temperature values (in decidegree Celsius). It can also be programmed to provide raw ADC code, but the secure software on 8996 programs it to provide real temperatures and also does the needed calibrations. We check the valid bit to ensure valid data is read by the AHB master. And the spec recommends the below algorithm to read data 3 consecutive times, which takes care of the worst case delay taken to propagate the updated data to the register. Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org> Signed-off-by: Eduardo Valentin <edubezval@gmail.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
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* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __QCOM_TSENS_H__
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#define __QCOM_TSENS_H__
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#define ONE_PT_CALIB 0x1
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#define ONE_PT_CALIB2 0x2
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#define TWO_PT_CALIB 0x3
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struct tsens_device;
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struct tsens_sensor {
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struct tsens_device *tmdev;
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struct thermal_zone_device *tzd;
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int offset;
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int id;
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int hw_id;
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int slope;
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u32 status;
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};
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/**
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* struct tsens_ops - operations as supported by the tsens device
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* @init: Function to initialize the tsens device
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* @calibrate: Function to calibrate the tsens device
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* @get_temp: Function which returns the temp in millidegC
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* @enable: Function to enable (clocks/power) tsens device
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* @disable: Function to disable the tsens device
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* @suspend: Function to suspend the tsens device
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* @resume: Function to resume the tsens device
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* @get_trend: Function to get the thermal/temp trend
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*/
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struct tsens_ops {
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/* mandatory callbacks */
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int (*init)(struct tsens_device *);
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int (*calibrate)(struct tsens_device *);
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int (*get_temp)(struct tsens_device *, int, int *);
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/* optional callbacks */
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int (*enable)(struct tsens_device *, int);
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void (*disable)(struct tsens_device *);
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int (*suspend)(struct tsens_device *);
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int (*resume)(struct tsens_device *);
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int (*get_trend)(struct tsens_device *, int, long *);
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};
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/**
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* struct tsens_data - tsens instance specific data
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* @num_sensors: Max number of sensors supported by platform
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* @ops: operations the tsens instance supports
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* @hw_ids: Subset of sensors ids supported by platform, if not the first n
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*/
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struct tsens_data {
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const u32 num_sensors;
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const struct tsens_ops *ops;
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unsigned int *hw_ids;
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};
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/* Registers to be saved/restored across a context loss */
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struct tsens_context {
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int threshold;
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int control;
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};
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struct tsens_device {
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struct device *dev;
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u32 num_sensors;
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struct regmap *map;
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struct regmap_field *status_field;
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struct tsens_context ctx;
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bool trdy;
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const struct tsens_ops *ops;
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struct tsens_sensor sensor[0];
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};
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char *qfprom_read(struct device *, const char *);
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void compute_intercept_slope(struct tsens_device *, u32 *, u32 *, u32);
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int init_common(struct tsens_device *);
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int get_temp_common(struct tsens_device *, int, int *);
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extern const struct tsens_data data_8916, data_8974, data_8960, data_8996;
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#endif /* __QCOM_TSENS_H__ */
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