drivers/gpu/drm/udl/udl_encoder.c

   1 /*
   2  * Copyright (C) 2012 Red Hat
   3  * based in parts on udlfb.c:
   4  * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
   5  * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
   6  * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License v2. See the file COPYING in the main directory of this archive for
  10  * more details.
  11  */
  12
  13 #include <drm/drmP.h>
  14 #include <drm/drm_crtc.h>
  15 #include <drm/drm_crtc_helper.h>
  16 #include "udl_drv.h"
  17
  18 /* dummy encoder */
  19 static void udl_enc_destroy(struct drm_encoder *encoder)
  20 {
  21         drm_encoder_cleanup(encoder);
  22         kfree(encoder);
  23 }
  24
  25 static void udl_encoder_disable(struct drm_encoder *encoder)
  26 {
  27 }
  28
  29 static bool udl_mode_fixup(struct drm_encoder *encoder,
  30                            const struct drm_display_mode *mode,
  31                            struct drm_display_mode *adjusted_mode)
  32 {
  33         return true;
  34 }
  35
  36 static void udl_encoder_prepare(struct drm_encoder *encoder)
  37 {
  38 }
  39
  40 static void udl_encoder_commit(struct drm_encoder *encoder)
  41 {
  42 }
  43
  44 static void udl_encoder_mode_set(struct drm_encoder *encoder,
  45                                  struct drm_display_mode *mode,
  46                                  struct drm_display_mode *adjusted_mode)
  47 {
  48 }
  49
  50 static void
  51 udl_encoder_dpms(struct drm_encoder *encoder, int mode)
  52 {
  53 }
  54
  55 static const struct drm_encoder_helper_funcs udl_helper_funcs = {
  56         .dpms = udl_encoder_dpms,
  57         .mode_fixup = udl_mode_fixup,
  58         .prepare = udl_encoder_prepare,
  59         .mode_set = udl_encoder_mode_set,
  60         .commit = udl_encoder_commit,
  61         .disable = udl_encoder_disable,
  62 };
  63
  64 static const struct drm_encoder_funcs udl_enc_funcs = {
  65         .destroy = udl_enc_destroy,
  66 };
  67
  68 struct drm_encoder *udl_encoder_init(struct drm_device *dev)
  69 {
  70         struct drm_encoder *encoder;
  71
  72         encoder = kzalloc(sizeof(struct drm_encoder), GFP_KERNEL);
  73         if (!encoder)
  74                 return NULL;
  75
  76         drm_encoder_init(dev, encoder, &udl_enc_funcs, DRM_MODE_ENCODER_TMDS,
  77                          NULL);
  78         drm_encoder_helper_add(encoder, &udl_helper_funcs);
  79         encoder->possible_crtcs = 1;
  80         return encoder;
  81 }