drivers/gpu/drm/nouveau/nvkm/subdev/i2c/pad.c

   1 /*
   2  * Copyright 2014 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24 #include "pad.h"
  25
  26 int
  27 _nvkm_i2c_pad_fini(struct nvkm_object *object, bool suspend)
  28 {
  29         struct nvkm_i2c_pad *pad = (void *)object;
  30         DBG("-> NULL\n");
  31         pad->port = NULL;
  32         return nvkm_object_fini(&pad->base, suspend);
  33 }
  34
  35 int
  36 _nvkm_i2c_pad_init(struct nvkm_object *object)
  37 {
  38         struct nvkm_i2c_pad *pad = (void *)object;
  39         DBG("-> PORT:%02x\n", pad->next->index);
  40         pad->port = pad->next;
  41         return nvkm_object_init(&pad->base);
  42 }
  43
  44 int
  45 nvkm_i2c_pad_create_(struct nvkm_object *parent,
  46                      struct nvkm_object *engine,
  47                      struct nvkm_oclass *oclass, int index,
  48                      int size, void **pobject)
  49 {
  50         struct nvkm_i2c *i2c = nvkm_i2c(parent);
  51         struct nvkm_i2c_port *port;
  52         struct nvkm_i2c_pad *pad;
  53         int ret;
  54
  55         list_for_each_entry(port, &i2c->ports, head) {
  56                 pad = nvkm_i2c_pad(port);
  57                 if (pad->index == index) {
  58                         atomic_inc(&nv_object(pad)->refcount);
  59                         *pobject = pad;
  60                         return 1;
  61                 }
  62         }
  63
  64         ret = nvkm_object_create_(parent, engine, oclass, 0, size, pobject);
  65         pad = *pobject;
  66         if (ret)
  67                 return ret;
  68
  69         pad->index = index;
  70         return 0;
  71 }
  72
  73 int
  74 _nvkm_i2c_pad_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
  75                    struct nvkm_oclass *oclass, void *data, u32 index,
  76                    struct nvkm_object **pobject)
  77 {
  78         struct nvkm_i2c_pad *pad;
  79         int ret;
  80         ret = nvkm_i2c_pad_create(parent, engine, oclass, index, &pad);
  81         *pobject = nv_object(pad);
  82         return ret;
  83 }