drivers/gpu/drm/drm_kms_helper_common.c

   1 /*
   2  * Copyright © 2015 Intel Corporation
   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 (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Rafael Antognolli <rafael.antognolli@intel.com>
  25  *
  26  */
  27
  28 #include <linux/module.h>
  29 #include <drm/drmP.h>
  30
  31 #include "drm_crtc_helper_internal.h"
  32
  33 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  34 MODULE_DESCRIPTION("DRM KMS helper");
  35 MODULE_LICENSE("GPL and additional rights");
  36
  37 #if IS_ENABLED(CONFIG_DRM_LOAD_EDID_FIRMWARE)
  38
  39 /* Backward compatibility for drm_kms_helper.edid_firmware */
  40 static int edid_firmware_set(const char *val, const struct kernel_param *kp)
  41 {
  42         DRM_NOTE("drm_kms_firmware.edid_firmware is deprecated, please use drm.edid_firmware intead.\n");
  43
  44         return __drm_set_edid_firmware_path(val);
  45 }
  46
  47 static int edid_firmware_get(char *buffer, const struct kernel_param *kp)
  48 {
  49         return __drm_get_edid_firmware_path(buffer, PAGE_SIZE);
  50 }
  51
  52 static const struct kernel_param_ops edid_firmware_ops = {
  53         .set = edid_firmware_set,
  54         .get = edid_firmware_get,
  55 };
  56
  57 module_param_cb(edid_firmware, &edid_firmware_ops, NULL, 0644);
  58 __MODULE_PARM_TYPE(edid_firmware, "charp");
  59 MODULE_PARM_DESC(edid_firmware,
  60                  "DEPRECATED. Use drm.edid_firmware module parameter instead.");
  61
  62 #endif
  63
  64 static int __init drm_kms_helper_init(void)
  65 {
  66         int ret;
  67
  68         /* Call init functions from specific kms helpers here */
  69         ret = drm_fb_helper_modinit();
  70         if (ret < 0)
  71                 goto out;
  72
  73         ret = drm_dp_aux_dev_init();
  74         if (ret < 0)
  75                 goto out;
  76
  77 out:
  78         return ret;
  79 }
  80
  81 static void __exit drm_kms_helper_exit(void)
  82 {
  83         /* Call exit functions from specific kms helpers here */
  84         drm_dp_aux_dev_exit();
  85 }
  86
  87 module_init(drm_kms_helper_init);
  88 module_exit(drm_kms_helper_exit);