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drm_module.c revision 1.1.2.4 
      1 /*	$NetBSD: drm_module.c,v 1.1.2.4 2013/07/24 03:31:12 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 1.1.2.4 2013/07/24 03:31:12 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 
     42 /*
     43  * XXX I2C stuff should be moved to a separate drm2edid module.
     44  *
     45  * XXX PCI stuff should be moved to a separate drm2pci module.
     46  *
     47  * XXX Other Linux stuff should be moved to a linux compatibility
     48  * module on which this one depends.
     49  */
     50 MODULE(MODULE_CLASS_MISC, drm, "iic,pci");
     51 
     52 #ifdef _MODULE
     53 #include "ioconf.c"
     54 #endif
     55 
     56 extern const struct cdevsw drm_cdevsw; /* XXX Put this in a header file?  */
     57 
     58 static int
     59 drm_modcmd(modcmd_t cmd, void *arg __unused)
     60 {
     61 #ifdef _MODULE
     62 	devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR;
     63 	int error;
     64 #endif
     65 
     66 	switch (cmd) {
     67 	case MODULE_CMD_INIT:
     68 		error = linux_kmap_init();
     69 		if (error) {
     70 			aprint_error("drm: unable to initialize linux kmap:"
     71 			    " %d", error);
     72 			return error;
     73 		}
     74 #ifdef _MODULE
     75 		error = config_init_component(cfdriver_ioconf_drm,
     76 		    cfattach_ioconf_drm, cfdata_ioconf_drm);
     77 		if (error) {
     78 			aprint_error("drm: unable to init component: %d\n",
     79 			    error);
     80 			linux_kmap_fini();
     81 			return error;
     82 		}
     83 		error = devsw_attach("drm", NULL, &bmajor,
     84 		    &drm_cdevsw, &cmajor);
     85 		if (error) {
     86 			aprint_error("drm: unable to attach devsw: %d\n",
     87 			    error);
     88 			(void)config_fini_component(cfdriver_ioconf_drm,
     89 			    cfattach_ioconf_drm, cfdata_ioconf_drm);
     90 			linux_kmap_fini();
     91 			return error;
     92 		}
     93 #endif
     94 		return 0;
     95 
     96 	case MODULE_CMD_FINI:
     97 #ifdef _MODULE
     98 		error = devsw_detach(NULL, &drm_cdevsw);
     99 		if (error)
    100 			return error;
    101 		error = config_fini_component(cfdriver_ioconf_drm,
    102 		    cfattach_ioconf_drm, cfdata_ioconf_drm);
    103 		if (error)
    104 			/* XXX Now what?  Reattach the devsw?  */
    105 			return error;
    106 #endif
    107 		linux_kmap_fini();
    108 		return 0;
    109 
    110 	default:
    111 		return ENOTTY;
    112 	}
    113 }
    114