drivers/video/fbdev/via/via_aux.h

   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
  33 struct 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
  38 struct 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
  53 struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);
  54 void via_aux_free(struct via_aux_bus *bus);
  55 const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);
  56
  57
  58 static 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
  70 static 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 */
  82 void via_aux_ch7301_probe(struct via_aux_bus *bus);
  83 void via_aux_edid_probe(struct via_aux_bus *bus);
  84 void via_aux_sii164_probe(struct via_aux_bus *bus);
  85 void via_aux_vt1636_probe(struct via_aux_bus *bus);
  86 void via_aux_vt1632_probe(struct via_aux_bus *bus);
  87 void via_aux_vt1631_probe(struct via_aux_bus *bus);
  88 void via_aux_vt1625_probe(struct via_aux_bus *bus);
  89 void via_aux_vt1622_probe(struct via_aux_bus *bus);
  90 void via_aux_vt1621_probe(struct via_aux_bus *bus);
  91
  92
  93 #endif /* __VIA_AUX_H__ */