66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
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/*
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* Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef __LINUX_TACHOMETER_H
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#define __LINUX_TACHOMETER_H
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#define TACH_FAN_TACH0 0x0
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#define TACH_FAN_TACH0_OVERFLOW 0x3
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#define TACH_FAN_TACH0_OVERFLOW_WIN_LEN_MASK 0x6
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#define TACH_FAN_TACH1 0x4
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#define TACH_FAN_TACH0_PERIOD_MASK 0x7FFFF
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#define TACH_FAN_TACH0_PERIOD_MAX 0x7FFFF
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#define TACH_FAN_TACH0_PERIOD_MIN 0x0
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#define TACH_FAN_TACH0_WIN_LENGTH_SHIFT 25
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#define TACH_FAN_TACH0_WIN_LENGTH_MASK 0x3
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#define TACH_FAN_TACH0_OVERFLOW_MASK 0x1000000
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struct tachometer_dev;
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struct tachometer_ops {
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unsigned long (*read_rpm)(struct tachometer_dev *);
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unsigned long (*read_winlen)(struct tachometer_dev *);
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int (*set_winlen)(struct tachometer_dev *, u8);
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};
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struct tachometer_desc {
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const char *name;
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struct tachometer_ops *ops;
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};
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struct tachometer_config {
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const char *name;
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struct device_node *of_node;
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};
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struct tachometer_dev {
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struct device dev;
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const struct tachometer_desc *desc;
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struct tachometer_config config;
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struct mutex mutex;
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unsigned int min_rps;
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unsigned int max_rps;
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/* No. of tach input periods that to be monitored */
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unsigned int win_len;
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unsigned int rps; /* Rotation per second */
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unsigned int pulse_per_rev; /* Pulse Per Revolution */
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void *drv_data;
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bool enable_clk_gate;
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};
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struct tachometer_dev *devm_tachometer_register(struct device *dev,
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const struct tachometer_desc *desc, struct tachometer_config *config);
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void tachometer_set_drvdata(struct tachometer_dev *tach_dev, void *drv_data);
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void* tachometer_get_drvdata(struct tachometer_dev *tach_dev);
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#endif
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