85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/*
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* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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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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*/
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include "tsens.h"
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#define STATUS_OFFSET 0x10a0
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#define LAST_TEMP_MASK 0xfff
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#define STATUS_VALID_BIT BIT(21)
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#define CODE_SIGN_BIT BIT(11)
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static int get_temp_8996(struct tsens_device *tmdev, int id, int *temp)
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{
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struct tsens_sensor *s = &tmdev->sensor[id];
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u32 code;
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unsigned int sensor_addr;
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int last_temp = 0, last_temp2 = 0, last_temp3 = 0, ret;
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sensor_addr = STATUS_OFFSET + s->hw_id * 4;
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ret = regmap_read(tmdev->map, sensor_addr, &code);
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if (ret)
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return ret;
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last_temp = code & LAST_TEMP_MASK;
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if (code & STATUS_VALID_BIT)
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goto done;
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/* Try a second time */
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ret = regmap_read(tmdev->map, sensor_addr, &code);
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if (ret)
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return ret;
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if (code & STATUS_VALID_BIT) {
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last_temp = code & LAST_TEMP_MASK;
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goto done;
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} else {
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last_temp2 = code & LAST_TEMP_MASK;
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}
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/* Try a third/last time */
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ret = regmap_read(tmdev->map, sensor_addr, &code);
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if (ret)
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return ret;
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if (code & STATUS_VALID_BIT) {
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last_temp = code & LAST_TEMP_MASK;
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goto done;
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} else {
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last_temp3 = code & LAST_TEMP_MASK;
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}
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if (last_temp == last_temp2)
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last_temp = last_temp2;
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else if (last_temp2 == last_temp3)
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last_temp = last_temp3;
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done:
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/* Code sign bit is the sign extension for a negative value */
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if (last_temp & CODE_SIGN_BIT)
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last_temp |= ~CODE_SIGN_BIT;
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/* Temperatures are in deciCelicius */
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*temp = last_temp * 100;
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return 0;
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}
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static const struct tsens_ops ops_8996 = {
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.init = init_common,
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.get_temp = get_temp_8996,
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};
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const struct tsens_data data_8996 = {
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.num_sensors = 13,
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.ops = &ops_8996,
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};
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