cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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via_aux.h (2162B)

      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 I2C
      7 */
      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 slave 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__ */