1 /* $NetBSD: drm_module.c,v 1.8 2014/09/14 20:08:21 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 1.8 2014/09/14 20:08:21 riastradh Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/conf.h> 37 #include <sys/device.h> 38 #include <sys/module.h> 39 #ifndef _MODULE 40 #include <sys/once.h> 41 #endif 42 #include <sys/reboot.h> 43 #include <sys/systm.h> 44 45 #include <linux/mutex.h> 46 47 #include <drm/drmP.h> 48 49 /* 50 * XXX I2C stuff should be moved to a separate drmkms_i2c module. 51 */ 52 MODULE(MODULE_CLASS_DRIVER, drmkms, "iic,drmkms_linux"); 53 54 struct mutex drm_global_mutex; 55 56 static int 57 drm_init(void) 58 { 59 extern int linux_guarantee_initialized(void); 60 int error; 61 62 error = linux_guarantee_initialized(); 63 if (error) 64 return error; 65 66 if (ISSET(boothowto, AB_DEBUG)) 67 drm_debug = ~(unsigned int)0; 68 69 spin_lock_init(&drm_minor_lock); 70 idr_init(&drm_minors_idr); 71 linux_mutex_init(&drm_global_mutex); 72 drm_connector_ida_init(); 73 drm_global_init(); 74 75 return 0; 76 } 77 78 int drm_guarantee_initialized(void); /* XXX */ 79 int 80 drm_guarantee_initialized(void) 81 { 82 #ifdef _MODULE 83 return 0; 84 #else 85 static ONCE_DECL(drm_init_once); 86 87 return RUN_ONCE(&drm_init_once, &drm_init); 88 #endif 89 } 90 91 static void 92 drm_fini(void) 93 { 94 95 drm_global_release(); 96 drm_connector_ida_destroy(); 97 linux_mutex_destroy(&drm_global_mutex); 98 idr_destroy(&drm_minors_idr); 99 spin_lock_destroy(&drm_minor_lock); 100 } 101 102 static int 103 drmkms_modcmd(modcmd_t cmd, void *arg __unused) 104 { 105 #ifdef _MODULE 106 devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR; 107 #endif 108 int error; 109 110 switch (cmd) { 111 case MODULE_CMD_INIT: 112 #ifdef _MODULE 113 error = drm_init(); 114 #else 115 error = drm_guarantee_initialized(); 116 #endif 117 if (error) 118 return error; 119 #ifdef _MODULE 120 error = devsw_attach("drm", NULL, &bmajor, 121 &drm_cdevsw, &cmajor); 122 if (error) { 123 aprint_error("drmkms: unable to attach devsw: %d\n", 124 error); 125 return error; 126 } 127 #endif 128 return 0; 129 130 case MODULE_CMD_FINI: 131 #ifdef _MODULE 132 error = devsw_detach(NULL, &drm_cdevsw); 133 if (error) 134 return error; 135 #endif 136 drm_fini(); 137 return 0; 138 139 default: 140 return ENOTTY; 141 } 142 } 143