1 /* $NetBSD: sysmon.c,v 1.19 2014/07/25 08:10:39 dholland Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 Zembu Labs, Inc. 5 * All rights reserved. 6 * 7 * Author: Jason R. Thorpe <thorpej@zembu.com> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Zembu Labs, Inc. 20 * 4. Neither the name of Zembu Labs nor the names of its employees may 21 * be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS 25 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR- 26 * RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS- 27 * CLAIMED. IN NO EVENT SHALL ZEMBU LABS BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Clearing house for system monitoring hardware. We currently 38 * handle environmental sensors, watchdog timers, and power management. 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: sysmon.c,v 1.19 2014/07/25 08:10:39 dholland Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/conf.h> 46 #include <sys/errno.h> 47 #include <sys/fcntl.h> 48 #include <sys/callout.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 #include <sys/proc.h> 52 53 #include <dev/sysmon/sysmonvar.h> 54 #include <dev/sysmon/sysmonconf.h> 55 56 dev_type_open(sysmonopen); 57 dev_type_close(sysmonclose); 58 dev_type_ioctl(sysmonioctl); 59 dev_type_read(sysmonread); 60 dev_type_poll(sysmonpoll); 61 dev_type_kqfilter(sysmonkqfilter); 62 63 const struct cdevsw sysmon_cdevsw = { 64 .d_open = sysmonopen, 65 .d_close = sysmonclose, 66 .d_read = sysmonread, 67 .d_write = nowrite, 68 .d_ioctl = sysmonioctl, 69 .d_stop = nostop, 70 .d_tty = notty, 71 .d_poll = sysmonpoll, 72 .d_mmap = nommap, 73 .d_kqfilter = sysmonkqfilter, 74 .d_discard = nodiscard, 75 .d_flag = D_OTHER | D_MPSAFE 76 }; 77 78 /* 79 * sysmonopen: 80 * 81 * Open the system monitor device. 82 */ 83 int 84 sysmonopen(dev_t dev, int flag, int mode, struct lwp *l) 85 { 86 int error; 87 88 switch (minor(dev)) { 89 #if NSYSMON_ENVSYS > 0 90 case SYSMON_MINOR_ENVSYS: 91 error = sysmonopen_envsys(dev, flag, mode, l); 92 break; 93 #endif 94 #if NSYSMON_WDOG > 0 95 case SYSMON_MINOR_WDOG: 96 error = sysmonopen_wdog(dev, flag, mode, l); 97 break; 98 #endif 99 #if NSYSMON_POWER > 0 100 case SYSMON_MINOR_POWER: 101 error = sysmonopen_power(dev, flag, mode, l); 102 break; 103 #endif 104 default: 105 error = ENODEV; 106 } 107 108 return (error); 109 } 110 111 /* 112 * sysmonclose: 113 * 114 * Close the system monitor device. 115 */ 116 int 117 sysmonclose(dev_t dev, int flag, int mode, struct lwp *l) 118 { 119 int error; 120 121 switch (minor(dev)) { 122 #if NSYSMON_ENVSYS > 0 123 case SYSMON_MINOR_ENVSYS: 124 error = sysmonclose_envsys(dev, flag, mode, l); 125 break; 126 #endif 127 #if NSYSMON_WDOG > 0 128 case SYSMON_MINOR_WDOG: 129 error = sysmonclose_wdog(dev, flag, mode, l); 130 break; 131 #endif 132 #if NSYSMON_POWER > 0 133 case SYSMON_MINOR_POWER: 134 error = sysmonclose_power(dev, flag, mode, l); 135 break; 136 #endif 137 default: 138 error = ENODEV; 139 } 140 141 return (error); 142 } 143 144 /* 145 * sysmonioctl: 146 * 147 * Perform a control request. 148 */ 149 int 150 sysmonioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 151 { 152 int error; 153 154 switch (minor(dev)) { 155 #if NSYSMON_ENVSYS > 0 156 case SYSMON_MINOR_ENVSYS: 157 error = sysmonioctl_envsys(dev, cmd, data, flag, l); 158 break; 159 #endif 160 #if NSYSMON_WDOG > 0 161 case SYSMON_MINOR_WDOG: 162 error = sysmonioctl_wdog(dev, cmd, data, flag, l); 163 break; 164 #endif 165 #if NSYSMON_POWER > 0 166 case SYSMON_MINOR_POWER: 167 error = sysmonioctl_power(dev, cmd, data, flag, l); 168 break; 169 #endif 170 default: 171 error = ENODEV; 172 } 173 174 return (error); 175 } 176 177 /* 178 * sysmonread: 179 * 180 * Perform a read request. 181 */ 182 int 183 sysmonread(dev_t dev, struct uio *uio, int flags) 184 { 185 int error; 186 187 switch (minor(dev)) { 188 #if NSYSMON_POWER > 0 189 case SYSMON_MINOR_POWER: 190 error = sysmonread_power(dev, uio, flags); 191 break; 192 #endif 193 default: 194 error = ENODEV; 195 } 196 197 return (error); 198 } 199 200 /* 201 * sysmonpoll: 202 * 203 * Poll the system monitor device. 204 */ 205 int 206 sysmonpoll(dev_t dev, int events, struct lwp *l) 207 { 208 int rv; 209 210 switch (minor(dev)) { 211 #if NSYSMON_POWER > 0 212 case SYSMON_MINOR_POWER: 213 rv = sysmonpoll_power(dev, events, l); 214 break; 215 #endif 216 default: 217 rv = events; 218 } 219 220 return (rv); 221 } 222 223 /* 224 * sysmonkqfilter: 225 * 226 * Kqueue filter for the system monitor device. 227 */ 228 int 229 sysmonkqfilter(dev_t dev, struct knote *kn) 230 { 231 int error; 232 233 switch (minor(dev)) { 234 #if NSYSMON_POWER > 0 235 case SYSMON_MINOR_POWER: 236 error = sysmonkqfilter_power(dev, kn); 237 break; 238 #endif 239 default: 240 error = 1; 241 } 242 243 return (error); 244 } 245