drivers/video/fbdev/via/via_aux.c

   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 #include <linux/slab.h>
  10 #include "via_aux.h"
  11
  12
  13 struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap)
  14 {
  15         struct via_aux_bus *bus;
  16
  17         if (!adap)
  18                 return NULL;
  19
  20         bus = kmalloc(sizeof(*bus), GFP_KERNEL);
  21         if (!bus)
  22                 return NULL;
  23
  24         bus->adap = adap;
  25         INIT_LIST_HEAD(&bus->drivers);
  26
  27         via_aux_edid_probe(bus);
  28         via_aux_vt1636_probe(bus);
  29         via_aux_vt1632_probe(bus);
  30         via_aux_vt1631_probe(bus);
  31         via_aux_vt1625_probe(bus);
  32         via_aux_vt1622_probe(bus);
  33         via_aux_vt1621_probe(bus);
  34         via_aux_sii164_probe(bus);
  35         via_aux_ch7301_probe(bus);
  36
  37         return bus;
  38 }
  39
  40 void via_aux_free(struct via_aux_bus *bus)
  41 {
  42         struct via_aux_drv *pos, *n;
  43
  44         if (!bus)
  45                 return;
  46
  47         list_for_each_entry_safe(pos, n, &bus->drivers, chain) {
  48                 if (pos->cleanup)
  49                         pos->cleanup(pos);
  50
  51                 list_del(&pos->chain);
  52                 kfree(pos->data);
  53                 kfree(pos);
  54         }
  55
  56         kfree(bus);
  57 }
  58
  59 const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus)
  60 {
  61         struct via_aux_drv *pos;
  62         const struct fb_videomode *mode = NULL;
  63
  64         if (!bus)
  65                 return NULL;
  66
  67         list_for_each_entry(pos, &bus->drivers, chain) {
  68                 if (pos->get_preferred_mode)
  69                         mode = pos->get_preferred_mode(pos);
  70         }
  71
  72         return mode;
  73 }