LXR linux/drivers/video/fbdev/via/via

   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__ */
  79