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