/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2015 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
 */

#include <linux/device.h>

#define to_siox_device(_dev)    container_of((_dev), struct siox_device, dev)
struct siox_device {
        struct list_head node; /* node in smaster->devices */
        struct siox_master *smaster;
        struct device dev;

        const char *type;
        size_t inbytes;
        size_t outbytes;
        u8 statustype;

        u8 status_read_clean;
        u8 status_written;
        u8 status_written_lastcycle;
        bool connected;

        /* statistics */
        unsigned int watchdog_errors;
        unsigned int status_errors;

        struct kernfs_node *status_errors_kn;
        struct kernfs_node *watchdog_kn;
        struct kernfs_node *watchdog_errors_kn;
        struct kernfs_node *connected_kn;
};

bool siox_device_synced(struct siox_device *sdevice);
bool siox_device_connected(struct siox_device *sdevice);

struct siox_driver {
        int (*probe)(struct siox_device *sdevice);
        void (*remove)(struct siox_device *sdevice);
        void (*shutdown)(struct siox_device *sdevice);

        /*
         * buf is big enough to hold sdev->inbytes - 1 bytes, the status byte
         * is in the scope of the framework.
         */
        int (*set_data)(struct siox_device *sdevice, u8 status, u8 buf[]);
        /*
         * buf is big enough to hold sdev->outbytes - 1 bytes, the status byte
         * is in the scope of the framework
         */
        int (*get_data)(struct siox_device *sdevice, const u8 buf[]);

        struct device_driver driver;
};

static inline struct siox_driver *to_siox_driver(struct device_driver *driver)
{
        if (driver)
                return container_of(driver, struct siox_driver, driver);
        else
                return NULL;
}

int __siox_driver_register(struct siox_driver *sdriver, struct module *owner);

static inline int siox_driver_register(struct siox_driver *sdriver)
{
        return __siox_driver_register(sdriver, THIS_MODULE);
}

static inline void siox_driver_unregister(struct siox_driver *sdriver)
{
        return driver_unregister(&sdriver->driver);
}

/*
 * module_siox_driver() - Helper macro for drivers that don't do
 * anything special in module init/exit.  This eliminates a lot of
 * boilerplate.  Each module may only use this macro once, and
 * calling it replaces module_init() and module_exit()
 */
#define module_siox_driver(__siox_driver) \
        module_driver(__siox_driver, siox_driver_register, \
                        siox_driver_unregister)