drivers/video/fbdev/via/via_aux.h

   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
  18 struct 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
  23 struct 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
  38 struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);
  39 void via_aux_free(struct via_aux_bus *bus);
  40 const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);
  41
  42
  43 static 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
  55 static 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 */
  67 void via_aux_ch7301_probe(struct via_aux_bus *bus);
  68 void via_aux_edid_probe(struct via_aux_bus *bus);
  69 void via_aux_sii164_probe(struct via_aux_bus *bus);
  70 void via_aux_vt1636_probe(struct via_aux_bus *bus);
  71 void via_aux_vt1632_probe(struct via_aux_bus *bus);
  72 void via_aux_vt1631_probe(struct via_aux_bus *bus);
  73 void via_aux_vt1625_probe(struct via_aux_bus *bus);
  74 void via_aux_vt1622_probe(struct via_aux_bus *bus);
  75 void via_aux_vt1621_probe(struct via_aux_bus *bus);
  76
  77
  78 #endif /* __VIA_AUX_H__ */