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drm_module.c revision 1.7.4.3 
      1 /*	$NetBSD: drm_module.c,v 1.7.4.3 2017/12/03 11:37:58 jdolecek Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 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: drm_module.c,v 1.7.4.3 2017/12/03 11:37:58 jdolecek Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/conf.h>
     37 #include <sys/device.h>
     38 #include <sys/module.h>
     39 #ifndef _MODULE
     40 #include <sys/once.h>
     41 #endif
     42 #include <sys/reboot.h>
     43 #include <sys/systm.h>
     44 
     45 #include <linux/mutex.h>
     46 
     47 #include <drm/drmP.h>
     48 #include <drm/drm_encoder_slave.h>
     49 #include <drm/drm_sysctl.h>
     50 
     51 /*
     52  * XXX I2C stuff should be moved to a separate drmkms_i2c module.
     53  */
     54 MODULE(MODULE_CLASS_DRIVER, drmkms, "drmkms_linux");
     55 
     56 struct mutex	drm_global_mutex;
     57 
     58 struct drm_sysctl_def drm_def = DRM_SYSCTL_INIT();
     59 
     60 static int
     61 drm_init(void)
     62 {
     63 	extern int linux_guarantee_initialized(void);
     64 	int error;
     65 
     66 	error = linux_guarantee_initialized();
     67 	if (error)
     68 		return error;
     69 
     70 	if (ISSET(boothowto, AB_DEBUG))
     71 		drm_debug = ~(unsigned int)0;
     72 
     73 	spin_lock_init(&drm_minor_lock);
     74 	idr_init(&drm_minors_idr);
     75 	linux_mutex_init(&drm_global_mutex);
     76 	drm_connector_ida_init();
     77 	drm_global_init();
     78 	drm_sysctl_init(&drm_def);
     79 	drm_i2c_encoders_init();
     80 
     81 	return 0;
     82 }
     83 
     84 int	drm_guarantee_initialized(void); /* XXX */
     85 int
     86 drm_guarantee_initialized(void)
     87 {
     88 #ifdef _MODULE
     89 	return 0;
     90 #else
     91 	static ONCE_DECL(drm_init_once);
     92 
     93 	return RUN_ONCE(&drm_init_once, &drm_init);
     94 #endif
     95 }
     96 
     97 static void
     98 drm_fini(void)
     99 {
    100 
    101 	drm_i2c_encoders_fini();
    102 	drm_sysctl_fini(&drm_def);
    103 	drm_global_release();
    104 	drm_connector_ida_destroy();
    105 	linux_mutex_destroy(&drm_global_mutex);
    106 	idr_destroy(&drm_minors_idr);
    107 	spin_lock_destroy(&drm_minor_lock);
    108 }
    109 
    110 static int
    111 drmkms_modcmd(modcmd_t cmd, void *arg __unused)
    112 {
    113 #ifdef _MODULE
    114 	devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR;
    115 #endif
    116 	int error;
    117 
    118 	switch (cmd) {
    119 	case MODULE_CMD_INIT:
    120 #ifdef _MODULE
    121 		error = drm_init();
    122 #else
    123 		error = drm_guarantee_initialized();
    124 #endif
    125 		if (error)
    126 			return error;
    127 #ifdef _MODULE
    128 		error = devsw_attach("drm", NULL, &bmajor,
    129 		    &drm_cdevsw, &cmajor);
    130 		if (error) {
    131 			aprint_error("drmkms: unable to attach devsw: %d\n",
    132 			    error);
    133 			return error;
    134 		}
    135 #endif
    136 		return 0;
    137 
    138 	case MODULE_CMD_FINI:
    139 #ifdef _MODULE
    140 		error = devsw_detach(NULL, &drm_cdevsw);
    141 		if (error)
    142 			return error;
    143 #endif
    144 		drm_fini();
    145 		return 0;
    146 
    147 	default:
    148 		return ENOTTY;
    149 	}
    150 }
    151