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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* PPS generator API kernel header
*
* Copyright (C) 2024 Rodolfo Giometti <giometti@enneenne.com>
*/
#ifndef LINUX_PPS_GEN_KERNEL_H
#define LINUX_PPS_GEN_KERNEL_H
#include <linux/pps_gen.h>
#include <linux/cdev.h>
#include <linux/device.h>
/*
* Global defines
*/
#define PPS_GEN_MAX_SOURCES 16 /* should be enough... */
struct pps_gen_device;
/**
* struct pps_gen_source_info - the specific PPS generator info
* @use_system_clock: true, if the system clock is used to generate pulses
* @get_time: query the time stored into the generator clock
* @enable: enable/disable the PPS pulses generation
*
* This is the main generator struct where all needed information must be
* placed before calling the pps_gen_register_source().
*/
struct pps_gen_source_info {
bool use_system_clock;
int (*get_time)(struct pps_gen_device *pps_gen,
struct timespec64 *time);
int (*enable)(struct pps_gen_device *pps_gen, bool enable);
/* private: internal use only */
struct module *owner;
struct device *parent; /* for device_create */
};
/* The main struct */
struct pps_gen_device {
struct pps_gen_source_info info; /* PSS generator info */
bool enabled; /* PSS generator status */
unsigned int event;
unsigned int sequence;
unsigned int last_ev; /* last PPS event id */
wait_queue_head_t queue; /* PPS event queue */
unsigned int id; /* PPS generator unique ID */
struct cdev cdev;
struct device *dev;
struct fasync_struct *async_queue; /* fasync method */
spinlock_t lock;
};
/*
* Global variables
*/
extern const struct attribute_group *pps_gen_groups[];
/*
* Exported functions
*/
extern struct pps_gen_device *pps_gen_register_source(
struct pps_gen_source_info *info);
extern void pps_gen_unregister_source(struct pps_gen_device *pps_gen);
extern void pps_gen_event(struct pps_gen_device *pps_gen,
unsigned int event, void *data);
#endif /* LINUX_PPS_GEN_KERNEL_H */
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