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      1 /*	$NetBSD: drm_kms_helper_common.c,v 1.2 2021/12/18 23:44:57 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright  2015 Intel Corporation
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice (including the next
     14  * paragraph) shall be included in all copies or substantial portions of the
     15  * Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     23  * IN THE SOFTWARE.
     24  *
     25  * Authors:
     26  *    Rafael Antognolli <rafael.antognolli (at) intel.com>
     27  *
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: drm_kms_helper_common.c,v 1.2 2021/12/18 23:44:57 riastradh Exp $");
     32 
     33 #include <linux/module.h>
     34 
     35 #include <drm/drm_print.h>
     36 
     37 #include "drm_crtc_helper_internal.h"
     38 
     39 MODULE_AUTHOR("David Airlie, Jesse Barnes");
     40 MODULE_DESCRIPTION("DRM KMS helper");
     41 MODULE_LICENSE("GPL and additional rights");
     42 
     43 #if IS_ENABLED(CONFIG_DRM_LOAD_EDID_FIRMWARE)
     44 
     45 /* Backward compatibility for drm_kms_helper.edid_firmware */
     46 static int edid_firmware_set(const char *val, const struct kernel_param *kp)
     47 {
     48 	DRM_NOTE("drm_kms_helper.edid_firmware is deprecated, please use drm.edid_firmware instead.\n");
     49 
     50 	return __drm_set_edid_firmware_path(val);
     51 }
     52 
     53 static int edid_firmware_get(char *buffer, const struct kernel_param *kp)
     54 {
     55 	return __drm_get_edid_firmware_path(buffer, PAGE_SIZE);
     56 }
     57 
     58 static const struct kernel_param_ops edid_firmware_ops = {
     59 	.set = edid_firmware_set,
     60 	.get = edid_firmware_get,
     61 };
     62 
     63 module_param_cb(edid_firmware, &edid_firmware_ops, NULL, 0644);
     64 __MODULE_PARM_TYPE(edid_firmware, "charp");
     65 MODULE_PARM_DESC(edid_firmware,
     66 		 "DEPRECATED. Use drm.edid_firmware module parameter instead.");
     67 
     68 #endif
     69 
     70 static int __init drm_kms_helper_init(void)
     71 {
     72 	int ret;
     73 
     74 	/* Call init functions from specific kms helpers here */
     75 	ret = drm_fb_helper_modinit();
     76 	if (ret < 0)
     77 		goto out;
     78 
     79 	ret = drm_dp_aux_dev_init();
     80 	if (ret < 0)
     81 		goto out;
     82 
     83 out:
     84 	return ret;
     85 }
     86 
     87 static void __exit drm_kms_helper_exit(void)
     88 {
     89 	/* Call exit functions from specific kms helpers here */
     90 	drm_dp_aux_dev_exit();
     91 }
     92 
     93 module_init(drm_kms_helper_init);
     94 module_exit(drm_kms_helper_exit);
     95