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drm_module.c revision 1.6 
      1 /*	$NetBSD: drm_module.c,v 1.6 2014/07/16 20:56:25 riastradh 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 1.6 2014/07/16 20:56:25 riastradh Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/device.h>
     37 #include <sys/module.h>
     38 #ifndef _MODULE
     39 #include <sys/once.h>
     40 #endif
     41 #include <sys/reboot.h>
     42 #include <sys/systm.h>
     43 
     44 #include <linux/mutex.h>
     45 
     46 #include <drm/drmP.h>
     47 
     48 /*
     49  * XXX I2C stuff should be moved to a separate drmkms_i2c module.
     50  */
     51 MODULE(MODULE_CLASS_DRIVER, drmkms, "iic,drmkms_linux");
     52 
     53 #ifdef _MODULE
     54 #include "ioconf.c"
     55 #endif
     56 
     57 struct mutex	drm_global_mutex;
     58 
     59 static int
     60 drm_init(void)
     61 {
     62 	extern int linux_guarantee_initialized(void);
     63 	int error;
     64 
     65 	error = linux_guarantee_initialized();
     66 	if (error)
     67 		return error;
     68 
     69 	if (ISSET(boothowto, AB_DEBUG))
     70 		drm_debug = ~(unsigned int)0;
     71 
     72 	spin_lock_init(&drm_minor_lock);
     73 	idr_init(&drm_minors_idr);
     74 	linux_mutex_init(&drm_global_mutex);
     75 	drm_connector_ida_init();
     76 
     77 	return 0;
     78 }
     79 
     80 int	drm_guarantee_initialized(void); /* XXX */
     81 int
     82 drm_guarantee_initialized(void)
     83 {
     84 #ifdef _MODULE
     85 	return 0;
     86 #else
     87 	static ONCE_DECL(drm_init_once);
     88 
     89 	return RUN_ONCE(&drm_init_once, &drm_init);
     90 #endif
     91 }
     92 
     93 static void
     94 drm_fini(void)
     95 {
     96 
     97 	drm_connector_ida_destroy();
     98 	linux_mutex_destroy(&drm_global_mutex);
     99 	idr_destroy(&drm_minors_idr);
    100 	spin_lock_destroy(&drm_minor_lock);
    101 }
    102 
    103 static int
    104 drmkms_modcmd(modcmd_t cmd, void *arg __unused)
    105 {
    106 #ifdef _MODULE
    107 	devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR;
    108 #endif
    109 	int error;
    110 
    111 	switch (cmd) {
    112 	case MODULE_CMD_INIT:
    113 #ifdef _MODULE
    114 		error = drm_init();
    115 #else
    116 		error = drm_guarantee_initialized();
    117 #endif
    118 		if (error)
    119 			return error;
    120 #ifdef _MODULE
    121 		error = devsw_attach("drm", NULL, &bmajor,
    122 		    &drm_cdevsw, &cmajor);
    123 		if (error) {
    124 			aprint_error("drmkms: unable to attach devsw: %d\n",
    125 			    error);
    126 			return error;
    127 		}
    128 #endif
    129 		return 0;
    130 
    131 	case MODULE_CMD_FINI:
    132 #ifdef _MODULE
    133 		error = devsw_detach(NULL, &drm_cdevsw);
    134 		if (error)
    135 			return error;
    136 #endif
    137 		drm_fini();
    138 		return 0;
    139 
    140 	default:
    141 		return ENOTTY;
    142 	}
    143 }
    144