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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/*3 * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>4 */5/*6 * infrastructure for devices connected via I2C7 */8 9#ifndef __VIA_AUX_H__10#define __VIA_AUX_H__11 12 13#include <linux/list.h>14#include <linux/i2c.h>15#include <linux/fb.h>16 17 18struct via_aux_bus {19 struct i2c_adapter *adap; /* the I2C device to access the bus */20 struct list_head drivers; /* drivers for devices on this bus */21};22 23struct via_aux_drv {24 struct list_head chain; /* chain to support multiple drivers */25 26 struct via_aux_bus *bus; /* the I2C bus used */27 u8 addr; /* the I2C target address */28 29 const char *name; /* human readable name of the driver */30 void *data; /* private data of this driver */31 32 void (*cleanup)(struct via_aux_drv *drv);33 const struct fb_videomode* (*get_preferred_mode)34 (struct via_aux_drv *drv);35};36 37 38struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);39void via_aux_free(struct via_aux_bus *bus);40const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);41 42 43static inline bool via_aux_add(struct via_aux_drv *drv)44{45 struct via_aux_drv *data = kmalloc(sizeof(*data), GFP_KERNEL);46 47 if (!data)48 return false;49 50 *data = *drv;51 list_add_tail(&data->chain, &data->bus->drivers);52 return true;53}54 55static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf,56 u8 len)57{58 struct i2c_msg msg[2] = {59 {.addr = drv->addr, .flags = 0, .len = 1, .buf = &start},60 {.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} };61 62 return i2c_transfer(drv->bus->adap, msg, 2) == 2;63}64 65 66/* probe functions of existing drivers - should only be called in via_aux.c */67void via_aux_ch7301_probe(struct via_aux_bus *bus);68void via_aux_edid_probe(struct via_aux_bus *bus);69void via_aux_sii164_probe(struct via_aux_bus *bus);70void via_aux_vt1636_probe(struct via_aux_bus *bus);71void via_aux_vt1632_probe(struct via_aux_bus *bus);72void via_aux_vt1631_probe(struct via_aux_bus *bus);73void via_aux_vt1625_probe(struct via_aux_bus *bus);74void via_aux_vt1622_probe(struct via_aux_bus *bus);75void via_aux_vt1621_probe(struct via_aux_bus *bus);76 77 78#endif /* __VIA_AUX_H__ */79