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drm_module.c revision 1.1.2.8 
      1 /*	$NetBSD: drm_module.c,v 1.1.2.8 2014/01/15 13:54:03 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 1.1.2.8 2014/01/15 13:54:03 riastradh Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/device.h>
     37 #include <sys/module.h>
     38 #include <sys/systm.h>
     39 
     40 #include <linux/highmem.h>
     41 #include <linux/mutex.h>
     42 #include <linux/workqueue.h>
     43 
     44 #include <drm/drmP.h>
     45 
     46 /*
     47  * XXX I2C stuff should be moved to a separate drm2edid module.
     48  *
     49  * XXX PCI stuff should be moved to a separate drm2pci module.
     50  *
     51  * XXX Other Linux stuff should be moved to a linux compatibility
     52  * module on which this one depends.
     53  */
     54 MODULE(MODULE_CLASS_MISC, drm2, "iic,pci");
     55 
     56 #ifdef _MODULE
     57 #include "ioconf.c"
     58 #endif
     59 
     60 extern const struct cdevsw drm_cdevsw; /* XXX Put this in a header file?  */
     61 
     62 static int
     63 drm2_modcmd(modcmd_t cmd, void *arg __unused)
     64 {
     65 #ifdef _MODULE
     66 	devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR;
     67 	int error;
     68 #endif
     69 
     70 	switch (cmd) {
     71 	case MODULE_CMD_INIT:
     72 		linux_mutex_init(&drm_global_mutex);
     73 		error = linux_kmap_init();
     74 		if (error) {
     75 			aprint_error("drm: unable to initialize linux kmap:"
     76 			    " %d", error);
     77 			goto init_fail0;
     78 		}
     79 		error = linux_workqueue_init();
     80 		if (error) {
     81 			aprint_error("drm: unable to initialize workqueues:"
     82 			    " %d", error);
     83 			goto init_fail1;
     84 		}
     85 #ifdef _MODULE
     86 		error = config_init_component(cfdriver_ioconf_drm,
     87 		    cfattach_ioconf_drm, cfdata_ioconf_drm);
     88 		if (error) {
     89 			aprint_error("drm: unable to init component: %d\n",
     90 			    error);
     91 			goto init_fail2;
     92 		}
     93 		error = devsw_attach("drm", NULL, &bmajor,
     94 		    &drm_cdevsw, &cmajor);
     95 		if (error) {
     96 			aprint_error("drm: unable to attach devsw: %d\n",
     97 			    error);
     98 			goto init_fail3;
     99 		}
    100 #endif
    101 		return 0;
    102 
    103 #ifdef _MODULE
    104 #if 0
    105 init_fail4:	(void)devsw_detach(NULL, &drm_cdevsw);
    106 #endif
    107 init_fail3:	(void)config_fini_component(cfdriver_ioconf_drm,
    108 		    cfattach_ioconf_drm, cfdata_ioconf_drm);
    109 init_fail2:	linux_workqueue_fini();
    110 #endif	/* _MODULE */
    111 init_fail1:	linux_kmap_fini();
    112 init_fail0:	linux_mutex_destroy(&drm_global_mutex);
    113 		return error;
    114 
    115 	case MODULE_CMD_FINI:
    116 #ifdef _MODULE
    117 		error = devsw_detach(NULL, &drm_cdevsw);
    118 		if (error)
    119 			return error;
    120 		error = config_fini_component(cfdriver_ioconf_drm,
    121 		    cfattach_ioconf_drm, cfdata_ioconf_drm);
    122 		if (error)
    123 			/* XXX Now what?  Reattach the devsw?  */
    124 			return error;
    125 #endif
    126 		linux_workqueue_fini();
    127 		linux_kmap_fini();
    128 		linux_mutex_destroy(&drm_global_mutex);
    129 		return 0;
    130 
    131 	default:
    132 		return ENOTTY;
    133 	}
    134 }
    135