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drm_module.c revision 1.7.2.1 
      1 /*	$NetBSD: drm_module.c,v 1.7.2.1 2014/11/10 19:45:54 martin 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 1.7.2.1 2014/11/10 19:45:54 martin 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 
     49 /*
     50  * XXX I2C stuff should be moved to a separate drmkms_i2c module.
     51  */
     52 MODULE(MODULE_CLASS_DRIVER, drmkms, "iic,drmkms_linux");
     53 
     54 struct mutex	drm_global_mutex;
     55 
     56 static int
     57 drm_init(void)
     58 {
     59 	extern int linux_guarantee_initialized(void);
     60 	int error;
     61 
     62 	error = linux_guarantee_initialized();
     63 	if (error)
     64 		return error;
     65 
     66 	if (ISSET(boothowto, AB_DEBUG))
     67 		drm_debug = ~(unsigned int)0;
     68 
     69 	spin_lock_init(&drm_minor_lock);
     70 	idr_init(&drm_minors_idr);
     71 	linux_mutex_init(&drm_global_mutex);
     72 	drm_connector_ida_init();
     73 	drm_global_init();
     74 
     75 	return 0;
     76 }
     77 
     78 int	drm_guarantee_initialized(void); /* XXX */
     79 int
     80 drm_guarantee_initialized(void)
     81 {
     82 #ifdef _MODULE
     83 	return 0;
     84 #else
     85 	static ONCE_DECL(drm_init_once);
     86 
     87 	return RUN_ONCE(&drm_init_once, &drm_init);
     88 #endif
     89 }
     90 
     91 static void
     92 drm_fini(void)
     93 {
     94 
     95 	drm_global_release();
     96 	drm_connector_ida_destroy();
     97 	linux_mutex_destroy(&drm_global_mutex);
     98 	idr_destroy(&drm_minors_idr);
     99 	spin_lock_destroy(&drm_minor_lock);
    100 }
    101 
    102 static int
    103 drmkms_modcmd(modcmd_t cmd, void *arg __unused)
    104 {
    105 #ifdef _MODULE
    106 	devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR;
    107 #endif
    108 	int error;
    109 
    110 	switch (cmd) {
    111 	case MODULE_CMD_INIT:
    112 #ifdef _MODULE
    113 		error = drm_init();
    114 #else
    115 		error = drm_guarantee_initialized();
    116 #endif
    117 		if (error)
    118 			return error;
    119 #ifdef _MODULE
    120 		error = devsw_attach("drm", NULL, &bmajor,
    121 		    &drm_cdevsw, &cmajor);
    122 		if (error) {
    123 			aprint_error("drmkms: unable to attach devsw: %d\n",
    124 			    error);
    125 			return error;
    126 		}
    127 #endif
    128 		return 0;
    129 
    130 	case MODULE_CMD_FINI:
    131 #ifdef _MODULE
    132 		error = devsw_detach(NULL, &drm_cdevsw);
    133 		if (error)
    134 			return error;
    135 #endif
    136 		drm_fini();
    137 		return 0;
    138 
    139 	default:
    140 		return ENOTTY;
    141 	}
    142 }
    143