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      1 /*	$NetBSD: via_module.c,v 1.5 2021/12/19 10:33:00 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2015 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: via_module.c,v 1.5 2021/12/19 10:33:00 riastradh Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/module.h>
     37 #include <sys/once.h>
     38 
     39 #include <drm/drm_device.h>
     40 #include <drm/via_drm.h>
     41 
     42 #include "via_drv.h"
     43 
     44 MODULE(MODULE_CLASS_DRIVER, viadrmums, "drmkms,drmkms_pci");
     45 
     46 #ifdef _MODULE
     47 #include "ioconf.c"
     48 #endif
     49 
     50 extern struct drm_driver *const via_drm_driver; /* XXX */
     51 
     52 static int
     53 viadrm_init(void)
     54 {
     55 	int error;
     56 
     57 	via_init_command_verifier(); /* idempotent, no unwind needed */
     58 
     59 	error = drm_guarantee_initialized();
     60 	if (error)
     61 		return error;
     62 
     63 	return 0;
     64 }
     65 
     66 int	viadrm_guarantee_initialized(void); /* XXX */
     67 int
     68 viadrm_guarantee_initialized(void)
     69 {
     70 #ifdef _MODULE
     71 	return 0;
     72 #else
     73 	static ONCE_DECL(viadrm_init_once);
     74 
     75 	return RUN_ONCE(&viadrm_init_once, &viadrm_init);
     76 #endif
     77 }
     78 
     79 static void
     80 viadrm_fini(void)
     81 {
     82 }
     83 
     84 static int
     85 viadrmums_modcmd(modcmd_t cmd, void *arg __unused)
     86 {
     87 	int error;
     88 
     89 	switch (cmd) {
     90 	case MODULE_CMD_INIT:
     91 #ifdef _MODULE
     92 		error = viadrm_init();
     93 #else
     94 		error = viadrm_guarantee_initialized();
     95 #endif
     96 		if (error) {
     97 			aprint_error("viadrmums: failed to initialize: %d\n",
     98 			    error);
     99 			return error;
    100 		}
    101 #ifdef _MODULE
    102 		error = config_init_component(cfdriver_ioconf_viadrmums,
    103 		    cfattach_ioconf_viadrmums, cfdata_ioconf_viadrmums);
    104 		if (error) {
    105 			aprint_error("viadrmums: failed to init component"
    106 			    ": %d\n", error);
    107 			viadrm_fini();
    108 			return error;
    109 		}
    110 #endif
    111 		return 0;
    112 
    113 	case MODULE_CMD_FINI:
    114 #ifdef _MODULE
    115 		error = config_fini_component(cfdriver_ioconf_viadrmums,
    116 		    cfattach_ioconf_viadrmums, cfdata_ioconf_viadrmums);
    117 		if (error) {
    118 			aprint_error("viadrmums: failed to fini component"
    119 			    ": %d\n", error);
    120 			return error;
    121 		}
    122 #endif
    123 		viadrm_fini();
    124 		return 0;
    125 
    126 	default:
    127 		return ENOTTY;
    128 	}
    129 }
    130