1 /* $NetBSD: kern_drvctl.c,v 1.1 2004/08/18 12:19:29 drochner Exp $ */ 2 3 /* 4 * Copyright (c) 2004 5 * Matthias Drochner. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions, and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: kern_drvctl.c,v 1.1 2004/08/18 12:19:29 drochner Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/conf.h> 36 #include <sys/device.h> 37 #include <sys/event.h> 38 #include <sys/malloc.h> 39 #include <sys/ioctl.h> 40 #include <sys/drvctlio.h> 41 42 dev_type_ioctl(drvctlioctl); 43 44 const struct cdevsw drvctl_cdevsw = { 45 nullopen, nullclose, nullread, nullwrite, drvctlioctl, 46 nostop, notty, nopoll, nommap, nokqfilter, 47 }; 48 49 void drvctlattach(int); 50 51 #define MAXLOCATORS 100 52 53 static int 54 detachdevbyname(const char *devname) 55 { 56 struct device *d; 57 58 TAILQ_FOREACH(d, &alldevs, dv_list) { 59 if (!strcmp(devname, d->dv_xname)) { 60 #ifndef XXXFULLRISK 61 /* 62 * If the parent cannot be notified, it might keep 63 * pointers to the detached device. 64 * There might be a private notification mechanism, 65 * but better play save here. 66 */ 67 if (d->dv_parent && 68 !d->dv_parent->dv_cfattach->ca_childdetached) 69 return (ENOTSUP); 70 #endif 71 return (config_detach(d, 0)); 72 } 73 } 74 75 return (ENXIO); 76 } 77 78 static int 79 rescanbus(const char *busname, const char *ifattr, 80 int numlocators, const int *locators) 81 { 82 int i; 83 struct device *d; 84 const char * const *ap; 85 86 /* XXX there should be a way to get limits and defaults (per device) 87 from config generated data */ 88 int locs[MAXLOCATORS]; 89 for (i = 0; i < MAXLOCATORS; i++) 90 locs[i] = -1; 91 92 for (i = 0; i < numlocators;i++) 93 locs[i] = locators[i]; 94 95 TAILQ_FOREACH(d, &alldevs, dv_list) { 96 if (!strcmp(busname, d->dv_xname)) { 97 /* 98 * must support rescan, and must have something 99 * to attach to 100 */ 101 if (!d->dv_cfattach->ca_rescan || 102 !d->dv_cfdriver->cd_attrs) 103 return (ENODEV); 104 105 /* allow to omit attribute if there is exactly one */ 106 if (!ifattr) { 107 if (d->dv_cfdriver->cd_attrs[1]) 108 return (EINVAL); 109 ifattr = d->dv_cfdriver->cd_attrs[0]; 110 } else { 111 /* check for valid attribute passed */ 112 for (ap = d->dv_cfdriver->cd_attrs; *ap; ap++) 113 if (!strcmp(*ap, ifattr)) 114 break; 115 if (!*ap) 116 return (EINVAL); 117 } 118 119 return (*d->dv_cfattach->ca_rescan)(d, ifattr, locs); 120 } 121 } 122 123 return (ENXIO); 124 } 125 126 int 127 drvctlioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) 128 { 129 int res; 130 char *ifattr; 131 int *locs; 132 133 switch (cmd) { 134 case DRVDETACHDEV: 135 #define d ((struct devdetachargs *)data) 136 res = detachdevbyname(d->devname); 137 #undef d 138 break; 139 case DRVRESCANBUS: 140 #define d ((struct devrescanargs *)data) 141 d->busname[sizeof(d->busname) - 1] = '\0'; 142 143 /* XXX better copyin? */ 144 if (d->ifattr[0]) { 145 d->ifattr[sizeof(d->ifattr) - 1] = '\0'; 146 ifattr = d->ifattr; 147 } else 148 ifattr = 0; 149 150 if (d->numlocators) { 151 if (d->numlocators > MAXLOCATORS) 152 return (EINVAL); 153 locs = malloc(d->numlocators * sizeof(int), M_DEVBUF, 154 M_WAITOK); 155 res = copyin(d->locators, locs, 156 d->numlocators * sizeof(int)); 157 if (res) 158 return (res); 159 } else 160 locs = 0; 161 res = rescanbus(d->busname, ifattr, d->numlocators, locs); 162 if (locs) 163 free(locs, M_DEVBUF); 164 #undef d 165 break; 166 default: 167 return (EPASSTHROUGH); 168 } 169 return (res); 170 } 171 172 void 173 drvctlattach(int arg) 174 { 175 } 176