| 1 | /** @file $Id: vboxvideo_vga.c 39335 2011-11-16 15:37:26Z vboxsync $
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| 2 | *
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| 3 | * VirtualBox Additions Linux kernel video driver, VGA functions
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2011 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | * --------------------------------------------------------------------
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| 17 | *
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| 18 | * This code is based on
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| 19 | * glint_vga.c
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| 20 | * with the following copyright and permission notice:
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| 21 | *
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| 22 | * Copyright 2010 Matt Turner.
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| 23 | *
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| 24 | * Permission is hereby granted, free of charge, to any person obtaining a
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| 25 | * copy of this software and associated documentation files (the "Software"),
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| 26 | * to deal in the Software without restriction, including without limitation
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| 27 | * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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| 28 | * and/or sell copies of the Software, and to permit persons to whom the
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| 29 | * Software is furnished to do so, subject to the following conditions:
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| 30 | *
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| 31 | * The above copyright notice and this permission notice shall be included in
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| 32 | * all copies or substantial portions of the Software.
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| 33 | *
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| 34 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| 35 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 36 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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| 37 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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| 38 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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| 39 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 40 | * OTHER DEALINGS IN THE SOFTWARE.
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| 41 | *
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| 42 | * Authors: Matt Turner
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| 43 | */
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| 44 |
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| 45 | #include <linux/version.h>
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| 46 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)
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| 47 |
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| 48 | #include "vboxvideo_drv.h"
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| 49 | #include "drm/drm_crtc_helper.h"
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| 50 |
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| 51 | static int vboxvideo_vga_get_modes(struct drm_connector *connector)
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| 52 | {
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| 53 | /* return 0 modes, so that we don't have to implement DDC/I2C yet. */
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| 54 | return 0;
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| 55 | }
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| 56 |
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| 57 | static int vboxvideo_vga_mode_valid(struct drm_connector *connector,
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| 58 | struct drm_display_mode *mode)
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| 59 | {
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| 60 | /* XXX check mode bandwidth */
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| 61 | /* XXX verify against max DAC output frequency */
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| 62 | return MODE_OK;
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| 63 | }
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| 64 |
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| 65 | struct drm_encoder *vboxvideo_connector_best_encoder(struct drm_connector
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| 66 | *connector)
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| 67 | {
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| 68 | int enc_id = connector->encoder_ids[0];
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| 69 | struct drm_mode_object *obj;
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| 70 | struct drm_encoder *encoder;
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| 71 |
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| 72 | /* pick the encoder ids */
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| 73 | if (enc_id) {
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| 74 | obj = drm_mode_object_find(connector->dev, enc_id, DRM_MODE_OBJECT_ENCODER);
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| 75 | if (!obj)
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| 76 | return NULL;
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| 77 | encoder = obj_to_encoder(obj);
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| 78 | return encoder;
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| 79 | }
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| 80 | return NULL;
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| 81 | }
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| 82 |
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| 83 | static enum drm_connector_status vboxvideo_vga_detect(struct drm_connector
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| 84 | *connector)
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| 85 | {
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| 86 | return connector_status_connected;
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| 87 | }
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| 88 |
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| 89 | static void vboxvideo_connector_destroy(struct drm_connector *connector)
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| 90 | {
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| 91 | drm_connector_cleanup(connector);
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| 92 | kfree(connector);
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| 93 | }
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| 94 |
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| 95 | struct drm_connector_helper_funcs vboxvideo_vga_connector_helper_funcs =
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| 96 | {
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| 97 | .get_modes = vboxvideo_vga_get_modes,
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| 98 | .mode_valid = vboxvideo_vga_mode_valid,
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| 99 | .best_encoder = vboxvideo_connector_best_encoder,
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| 100 | };
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| 101 |
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| 102 | struct drm_connector_funcs vboxvideo_vga_connector_funcs =
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| 103 | {
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| 104 | .dpms = drm_helper_connector_dpms,
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| 105 | .detect = vboxvideo_vga_detect,
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| 106 | .fill_modes = drm_helper_probe_single_connector_modes,
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| 107 | .destroy = vboxvideo_connector_destroy,
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| 108 | };
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| 109 |
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| 110 | struct drm_connector *vboxvideo_vga_init(struct drm_device *dev)
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| 111 | {
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| 112 | struct drm_connector *connector;
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| 113 | struct vboxvideo_connector *vboxvideo_connector;
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| 114 |
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| 115 | vboxvideo_connector = kzalloc(sizeof(struct vboxvideo_connector),
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| 116 | GFP_KERNEL);
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| 117 | if (!vboxvideo_connector)
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| 118 | return NULL;
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| 119 |
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| 120 | connector = &vboxvideo_connector->base;
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| 121 |
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| 122 | drm_connector_init(dev, connector,
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| 123 | &vboxvideo_vga_connector_funcs, DRM_MODE_CONNECTOR_VGA);
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| 124 |
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| 125 | drm_connector_helper_add(connector, &vboxvideo_vga_connector_helper_funcs);
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| 126 |
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| 127 | return connector;
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| 128 | }
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| 129 |
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| 130 | #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27) */
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