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drm_module.c revision 1.5.6.2 
      1 /*	$NetBSD: drm_module.c,v 1.5.6.2 2014/05/22 11:40:55 yamt 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 1.5.6.2 2014/05/22 11:40:55 yamt Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/device.h>
     37 #include <sys/module.h>
     38 #include <sys/reboot.h>
     39 #include <sys/systm.h>
     40 
     41 #include <drm/drmP.h>
     42 
     43 /*
     44  * XXX I2C stuff should be moved to a separate drmkms_i2c module.
     45  */
     46 MODULE(MODULE_CLASS_DRIVER, drmkms, "iic,drmkms_linux");
     47 
     48 #ifdef _MODULE
     49 #include "ioconf.c"
     50 #endif
     51 
     52 /*
     53  * XXX Mega-kludge.  See drm_init in drm_drv.c for details.
     54  */
     55 #ifdef _MODULE
     56 static const int linux_suppress_init = 1;
     57 #else
     58 extern int linux_suppress_init;
     59 #endif
     60 
     61 static int
     62 drmkms_modcmd(modcmd_t cmd, void *arg __unused)
     63 {
     64 #ifdef _MODULE
     65 	devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR;
     66 	int error;
     67 #endif
     68 
     69 	switch (cmd) {
     70 	case MODULE_CMD_INIT:
     71 		if (!linux_suppress_init) {
     72 			linux_mutex_init(&drm_global_mutex);
     73 			if (ISSET(boothowto, AB_DEBUG))
     74 				drm_debug = ~(unsigned int)0;
     75 		}
     76 #ifdef _MODULE
     77 		error = config_init_component(cfdriver_ioconf_drmkms,
     78 		    cfattach_ioconf_drmkms, cfdata_ioconf_drmkms);
     79 		if (error) {
     80 			aprint_error("drmkms: unable to init component: %d\n",
     81 			    error);
     82 			goto init_fail0;
     83 		}
     84 		error = devsw_attach("drm", NULL, &bmajor,
     85 		    &drm_cdevsw, &cmajor);
     86 		if (error) {
     87 			aprint_error("drmkms: unable to attach devsw: %d\n",
     88 			    error);
     89 			goto init_fail1;
     90 		}
     91 #endif
     92 		return 0;
     93 
     94 #ifdef _MODULE
     95 init_fail2: __unused
     96 		(void)devsw_detach(NULL, &drm_cdevsw);
     97 init_fail1:	(void)config_fini_component(cfdriver_ioconf_drmkms,
     98 		    cfattach_ioconf_drmkms, cfdata_ioconf_drmkms);
     99 init_fail0:	linux_mutex_destroy(&drm_global_mutex);
    100 		return error;
    101 #endif	/* _MODULE */
    102 
    103 	case MODULE_CMD_FINI:
    104 #ifdef _MODULE
    105 		error = devsw_detach(NULL, &drm_cdevsw);
    106 		if (error)
    107 			return error;
    108 		error = config_fini_component(cfdriver_ioconf_drmkms,
    109 		    cfattach_ioconf_drmkms, cfdata_ioconf_drmkms);
    110 		if (error)
    111 			/* XXX Now what?  Reattach the devsw?  */
    112 			return error;
    113 #endif
    114 		linux_mutex_destroy(&drm_global_mutex);
    115 		return 0;
    116 
    117 	default:
    118 		return ENOTTY;
    119 	}
    120 }
    121