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
  30 #include <drm/drm_print.h>
  31
  32 #include "drm_crtc_helper_internal.h"
  33
  34 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  35 MODULE_DESCRIPTION("DRM KMS helper");
  36 MODULE_LICENSE("GPL and additional rights");
  37
  38 #if IS_ENABLED(CONFIG_DRM_LOAD_EDID_FIRMWARE)
  39
  40 /* Backward compatibility for drm_kms_helper.edid_firmware */
  41 static int edid_firmware_set(const char *val, const struct kernel_param *kp)
  42 {
  43         DRM_NOTE("drm_kms_helper.edid_firmware is deprecated, please use drm.edid_firmware instead.\n");
  44
  45         return __drm_set_edid_firmware_path(val);
  46 }
  47
  48 static int edid_firmware_get(char *buffer, const struct kernel_param *kp)
  49 {
  50         return __drm_get_edid_firmware_path(buffer, PAGE_SIZE);
  51 }
  52
  53 static const struct kernel_param_ops edid_firmware_ops = {
  54         .set = edid_firmware_set,
  55         .get = edid_firmware_get,
  56 };
  57
  58 module_param_cb(edid_firmware, &edid_firmware_ops, NULL, 0644);
  59 __MODULE_PARM_TYPE(edid_firmware, "charp");
  60 MODULE_PARM_DESC(edid_firmware,
  61                  "DEPRECATED. Use drm.edid_firmware module parameter instead.");
  62
  63 #endif
  64
  65 static int __init drm_kms_helper_init(void)
  66 {
  67         int ret;
  68
  69         /* Call init functions from specific kms helpers here */
  70         ret = drm_fb_helper_modinit();
  71         if (ret < 0)
  72                 goto out;
  73
  74         ret = drm_dp_aux_dev_init();
  75         if (ret < 0)
  76                 goto out;
  77
  78 out:
  79         return ret;
  80 }
  81
  82 static void __exit drm_kms_helper_exit(void)
  83 {
  84         /* Call exit functions from specific kms helpers here */
  85         drm_dp_aux_dev_exit();
  86 }
  87
  88 module_init(drm_kms_helper_init);
  89 module_exit(drm_kms_helper_exit);