serio.h

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/*
 * Copyright (C) 1999-2002 Vojtech Pavlik
*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */
#ifndef _SERIO_H
#define _SERIO_H


#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <uapi/linux/serio.h>

struct serio {
    void *port_data;

    char name[32];
    char phys[32];

    bool manual_bind;

    struct serio_device_id id;

    spinlock_t lock;        /* protects critical sections from port's interrupt handler */

    int (*write)(struct serio *, unsigned char);
    int (*open)(struct serio *);
    void (*close)(struct serio *);
    int (*start)(struct serio *);
    void (*stop)(struct serio *);

    struct serio *parent;
    struct list_head child_node;    /* Entry in parent->children list */
    struct list_head children;
    unsigned int depth;     /* level of nesting in serio hierarchy */

    struct serio_driver *drv;   /* accessed from interrupt, must be protected by serio->lock and serio->sem */
    struct mutex drv_mutex;     /* protects serio->drv so attributes can pin driver */

    struct device dev;

    struct list_head node;
};
#define to_serio_port(d)    container_of(d, struct serio, dev)

struct serio_driver {
    const char *description;

    const struct serio_device_id *id_table;
    bool manual_bind;

    void (*write_wakeup)(struct serio *);
    irqreturn_t (*interrupt)(struct serio *, unsigned char, unsigned int);
    int  (*connect)(struct serio *, struct serio_driver *drv);
    int  (*reconnect)(struct serio *);
    void (*disconnect)(struct serio *);
    void (*cleanup)(struct serio *);

    struct device_driver driver;
};
#define to_serio_driver(d)  container_of(d, struct serio_driver, driver)

int serio_open(struct serio *serio, struct serio_driver *drv);
void serio_close(struct serio *serio);
void serio_rescan(struct serio *serio);
void serio_reconnect(struct serio *serio);
irqreturn_t serio_interrupt(struct serio *serio, unsigned char data, unsigned int flags);

void __serio_register_port(struct serio *serio, struct module *owner);

/* use a define to avoid include chaining to get THIS_MODULE */
#define serio_register_port(serio) \
    __serio_register_port(serio, THIS_MODULE)

void serio_unregister_port(struct serio *serio);
void serio_unregister_child_port(struct serio *serio);

int __must_check __serio_register_driver(struct serio_driver *drv,
                struct module *owner, const char *mod_name);

/* use a define to avoid include chaining to get THIS_MODULE & friends */
#define serio_register_driver(drv) \
    __serio_register_driver(drv, THIS_MODULE, KBUILD_MODNAME)

void serio_unregister_driver(struct serio_driver *drv);

#define module_serio_driver(__serio_driver) \
    module_driver(__serio_driver, serio_register_driver, \
               serio_unregister_driver)

static inline int serio_write(struct serio *serio, unsigned char data)
{
    if (serio->write)
        return serio->write(serio, data);
    else
        return -1;
}

static inline void serio_drv_write_wakeup(struct serio *serio)
{
    if (serio->drv && serio->drv->write_wakeup)
        serio->drv->write_wakeup(serio);
}

/*
 * Use the following functions to manipulate serio's per-port
 * driver-specific data.
 */
static inline void *serio_get_drvdata(struct serio *serio)
{
    return dev_get_drvdata(&serio->dev);
}

static inline void serio_set_drvdata(struct serio *serio, void *data)
{
    dev_set_drvdata(&serio->dev, data);
}

/*
 * Use the following functions to protect critical sections in
 * driver code from port's interrupt handler
 */
static inline void serio_pause_rx(struct serio *serio)
{
    spin_lock_irq(&serio->lock);
}

static inline void serio_continue_rx(struct serio *serio)
{
    spin_unlock_irq(&serio->lock);
}

#endif