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

   1/*
   2 * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public
   6 * License as published by the Free Software Foundation;
   7 * either version 2, or (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
  11 * the implied warranty of MERCHANTABILITY or FITNESS FOR
  12 * A PARTICULAR PURPOSE.See the GNU General Public License
  13 * for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc.,
  18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19 */
  20/*
  21 * infrastructure for devices connected via I2C
  22 */
  23
  24#ifndef __VIA_AUX_H__
  25#define __VIA_AUX_H__
  26
  27
  28#include <linux/list.h>
  29#include <linux/i2c.h>
  30#include <linux/fb.h>
  31
  32
  33struct via_aux_bus {
  34        struct i2c_adapter *adap;       /* the I2C device to access the bus */
  35        struct list_head drivers;       /* drivers for devices on this bus */
  36};
  37
  38struct via_aux_drv {
  39        struct list_head chain;         /* chain to support multiple drivers */
  40
  41        struct via_aux_bus *bus;        /* the I2C bus used */
  42        u8 addr;                        /* the I2C slave address */
  43
  44        const char *name;       /* human readable name of the driver */
  45        void *data;             /* private data of this driver */
  46
  47        void (*cleanup)(struct via_aux_drv *drv);
  48        const struct fb_videomode* (*get_preferred_mode)
  49                (struct via_aux_drv *drv);
  50};
  51
  52
  53struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);
  54void via_aux_free(struct via_aux_bus *bus);
  55const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);
  56
  57
  58static inline bool via_aux_add(struct via_aux_drv *drv)
  59{
  60        struct via_aux_drv *data = kmalloc(sizeof(*data), GFP_KERNEL);
  61
  62        if (!data)
  63                return false;
  64
  65        *data = *drv;
  66        list_add_tail(&data->chain, &data->bus->drivers);
  67        return true;
  68}
  69
  70static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf,
  71        u8 len)
  72{
  73        struct i2c_msg msg[2] = {
  74                {.addr = drv->addr, .flags = 0, .len = 1, .buf = &start},
  75                {.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} };
  76
  77        return i2c_transfer(drv->bus->adap, msg, 2) == 2;
  78}
  79
  80
  81/* probe functions of existing drivers - should only be called in via_aux.c */
  82void via_aux_ch7301_probe(struct via_aux_bus *bus);
  83void via_aux_edid_probe(struct via_aux_bus *bus);
  84void via_aux_sii164_probe(struct via_aux_bus *bus);
  85void via_aux_vt1636_probe(struct via_aux_bus *bus);
  86void via_aux_vt1632_probe(struct via_aux_bus *bus);
  87void via_aux_vt1631_probe(struct via_aux_bus *bus);
  88void via_aux_vt1625_probe(struct via_aux_bus *bus);
  89void via_aux_vt1622_probe(struct via_aux_bus *bus);
  90void via_aux_vt1621_probe(struct via_aux_bus *bus);
  91
  92
  93#endif /* __VIA_AUX_H__ */
  94