1 /* $NetBSD: drm_module.c,v 1.7 2014/07/17 13:47:19 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 1.7 2014/07/17 13:47:19 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 drm_global_init(); 77 78 return 0; 79 } 80 81 int drm_guarantee_initialized(void); /* XXX */ 82 int 83 drm_guarantee_initialized(void) 84 { 85 #ifdef _MODULE 86 return 0; 87 #else 88 static ONCE_DECL(drm_init_once); 89 90 return RUN_ONCE(&drm_init_once, &drm_init); 91 #endif 92 } 93 94 static void 95 drm_fini(void) 96 { 97 98 drm_global_release(); 99 drm_connector_ida_destroy(); 100 linux_mutex_destroy(&drm_global_mutex); 101 idr_destroy(&drm_minors_idr); 102 spin_lock_destroy(&drm_minor_lock); 103 } 104 105 static int 106 drmkms_modcmd(modcmd_t cmd, void *arg __unused) 107 { 108 #ifdef _MODULE 109 devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR; 110 #endif 111 int error; 112 113 switch (cmd) { 114 case MODULE_CMD_INIT: 115 #ifdef _MODULE 116 error = drm_init(); 117 #else 118 error = drm_guarantee_initialized(); 119 #endif 120 if (error) 121 return error; 122 #ifdef _MODULE 123 error = devsw_attach("drm", NULL, &bmajor, 124 &drm_cdevsw, &cmajor); 125 if (error) { 126 aprint_error("drmkms: unable to attach devsw: %d\n", 127 error); 128 return error; 129 } 130 #endif 131 return 0; 132 133 case MODULE_CMD_FINI: 134 #ifdef _MODULE 135 error = devsw_detach(NULL, &drm_cdevsw); 136 if (error) 137 return error; 138 #endif 139 drm_fini(); 140 return 0; 141 142 default: 143 return ENOTTY; 144 } 145 } 146