/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
 */
/*
 * infrastructure for devices connected via I2C
 */

#ifndef __VIA_AUX_H__
#define __VIA_AUX_H__


#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/fb.h>


struct via_aux_bus {
        struct i2c_adapter *adap;       /* the I2C device to access the bus */
        struct list_head drivers;       /* drivers for devices on this bus */
};

struct via_aux_drv {
        struct list_head chain;         /* chain to support multiple drivers */

        struct via_aux_bus *bus;        /* the I2C bus used */
        u8 addr;                        /* the I2C target address */

        const char *name;       /* human readable name of the driver */
        void *data;             /* private data of this driver */

        void (*cleanup)(struct via_aux_drv *drv);
        const struct fb_videomode* (*get_preferred_mode)
                (struct via_aux_drv *drv);
};


struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);
void via_aux_free(struct via_aux_bus *bus);
const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);


static inline bool via_aux_add(struct via_aux_drv *drv)
{
        struct via_aux_drv *data = kmalloc_obj(*data);

        if (!data)
                return false;

        *data = *drv;
        list_add_tail(&data->chain, &data->bus->drivers);
        return true;
}

static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf,
        u8 len)
{
        struct i2c_msg msg[2] = {
                {.addr = drv->addr, .flags = 0, .len = 1, .buf = &start},
                {.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} };

        return i2c_transfer(drv->bus->adap, msg, 2) == 2;
}


/* probe functions of existing drivers - should only be called in via_aux.c */
void via_aux_ch7301_probe(struct via_aux_bus *bus);
void via_aux_edid_probe(struct via_aux_bus *bus);
void via_aux_sii164_probe(struct via_aux_bus *bus);
void via_aux_vt1636_probe(struct via_aux_bus *bus);
void via_aux_vt1632_probe(struct via_aux_bus *bus);
void via_aux_vt1631_probe(struct via_aux_bus *bus);
void via_aux_vt1625_probe(struct via_aux_bus *bus);
void via_aux_vt1622_probe(struct via_aux_bus *bus);
void via_aux_vt1621_probe(struct via_aux_bus *bus);


#endif /* __VIA_AUX_H__ */