Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/x86/acpica/acpi_apm.c
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1 /*- 2 * Copyright (c) 2001 Mitsuru IWASAKI 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/11.2/sys/x86/acpica/acpi_apm.c 228283 2011-12-05 16:08:18Z ed $"); 29 30 #include <sys/param.h> 31 #include <sys/bus.h> 32 #include <sys/condvar.h> 33 #include <sys/conf.h> 34 #include <sys/fcntl.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #include <sys/poll.h> 38 #include <sys/uio.h> 39 40 #include <contrib/dev/acpica/include/acpi.h> 41 42 #include <dev/acpica/acpivar.h> 43 #include <dev/acpica/acpiio.h> 44 45 #include <machine/apm_bios.h> 46 47 /* 48 * APM driver emulation 49 */ 50 51 #define APM_UNKNOWN 0xff 52 53 static int apm_active; 54 55 static MALLOC_DEFINE(M_APMDEV, "apmdev", "APM device emulation"); 56 57 static d_open_t apmopen; 58 static d_write_t apmwrite; 59 static d_ioctl_t apmioctl; 60 static d_poll_t apmpoll; 61 static d_kqfilter_t apmkqfilter; 62 static void apmreadfiltdetach(struct knote *kn); 63 static int apmreadfilt(struct knote *kn, long hint); 64 static struct filterops apm_readfiltops = { 65 .f_isfd = 1, 66 .f_detach = apmreadfiltdetach, 67 .f_event = apmreadfilt, 68 }; 69 70 static struct cdevsw apm_cdevsw = { 71 .d_version = D_VERSION, 72 .d_open = apmopen, 73 .d_write = apmwrite, 74 .d_ioctl = apmioctl, 75 .d_poll = apmpoll, 76 .d_name = "apm", 77 .d_kqfilter = apmkqfilter 78 }; 79 80 static int 81 acpi_capm_convert_battstate(struct acpi_battinfo *battp) 82 { 83 int state; 84 85 state = APM_UNKNOWN; 86 87 if (battp->state & ACPI_BATT_STAT_DISCHARG) { 88 if (battp->cap >= 50) 89 state = 0; /* high */ 90 else 91 state = 1; /* low */ 92 } 93 if (battp->state & ACPI_BATT_STAT_CRITICAL) 94 state = 2; /* critical */ 95 if (battp->state & ACPI_BATT_STAT_CHARGING) 96 state = 3; /* charging */ 97 98 /* If still unknown, determine it based on the battery capacity. */ 99 if (state == APM_UNKNOWN) { 100 if (battp->cap >= 50) 101 state = 0; /* high */ 102 else 103 state = 1; /* low */ 104 } 105 106 return (state); 107 } 108 109 static int 110 acpi_capm_convert_battflags(struct acpi_battinfo *battp) 111 { 112 int flags; 113 114 flags = 0; 115 116 if (battp->cap >= 50) 117 flags |= APM_BATT_HIGH; 118 else { 119 if (battp->state & ACPI_BATT_STAT_CRITICAL) 120 flags |= APM_BATT_CRITICAL; 121 else 122 flags |= APM_BATT_LOW; 123 } 124 if (battp->state & ACPI_BATT_STAT_CHARGING) 125 flags |= APM_BATT_CHARGING; 126 if (battp->state == ACPI_BATT_STAT_NOT_PRESENT) 127 flags = APM_BATT_NOT_PRESENT; 128 129 return (flags); 130 } 131 132 static int 133 acpi_capm_get_info(apm_info_t aip) 134 { 135 int acline; 136 struct acpi_battinfo batt; 137 138 aip->ai_infoversion = 1; 139 aip->ai_major = 1; 140 aip->ai_minor = 2; 141 aip->ai_status = apm_active; 142 aip->ai_capabilities= 0xff00; /* unknown */ 143 144 if (acpi_acad_get_acline(&acline)) 145 aip->ai_acline = APM_UNKNOWN; /* unknown */ 146 else 147 aip->ai_acline = acline; /* on/off */ 148 149 if (acpi_battery_get_battinfo(NULL, &batt) != 0) { 150 aip->ai_batt_stat = APM_UNKNOWN; 151 aip->ai_batt_life = APM_UNKNOWN; 152 aip->ai_batt_time = -1; /* unknown */ 153 aip->ai_batteries = ~0U; /* unknown */ 154 } else { 155 aip->ai_batt_stat = acpi_capm_convert_battstate(&batt); 156 aip->ai_batt_life = batt.cap; 157 aip->ai_batt_time = (batt.min == -1) ? -1 : batt.min * 60; 158 aip->ai_batteries = acpi_battery_get_units(); 159 } 160 161 return (0); 162 } 163 164 static int 165 acpi_capm_get_pwstatus(apm_pwstatus_t app) 166 { 167 device_t dev; 168 int acline, unit, error; 169 struct acpi_battinfo batt; 170 171 if (app->ap_device != PMDV_ALLDEV && 172 (app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL)) 173 return (1); 174 175 if (app->ap_device == PMDV_ALLDEV) 176 error = acpi_battery_get_battinfo(NULL, &batt); 177 else { 178 unit = app->ap_device - PMDV_BATT0; 179 dev = devclass_get_device(devclass_find("battery"), unit); 180 if (dev != NULL) 181 error = acpi_battery_get_battinfo(dev, &batt); 182 else 183 error = ENXIO; 184 } 185 if (error) 186 return (1); 187 188 app->ap_batt_stat = acpi_capm_convert_battstate(&batt); 189 app->ap_batt_flag = acpi_capm_convert_battflags(&batt); 190 app->ap_batt_life = batt.cap; 191 app->ap_batt_time = (batt.min == -1) ? -1 : batt.min * 60; 192 193 if (acpi_acad_get_acline(&acline)) 194 app->ap_acline = APM_UNKNOWN; 195 else 196 app->ap_acline = acline; /* on/off */ 197 198 return (0); 199 } 200 201 /* Create a struct for tracking per-device suspend notification. */ 202 static struct apm_clone_data * 203 apm_create_clone(struct cdev *dev, struct acpi_softc *acpi_sc) 204 { 205 struct apm_clone_data *clone; 206 207 clone = malloc(sizeof(*clone), M_APMDEV, M_WAITOK); 208 clone->cdev = dev; 209 clone->acpi_sc = acpi_sc; 210 clone->notify_status = APM_EV_NONE; 211 bzero(&clone->sel_read, sizeof(clone->sel_read)); 212 knlist_init_mtx(&clone->sel_read.si_note, &acpi_mutex); 213 214 /* 215 * The acpi device is always managed by devd(8) and is considered 216 * writable (i.e., ack is required to allow suspend to proceed.) 217 */ 218 if (strcmp("acpi", devtoname(dev)) == 0) 219 clone->flags = ACPI_EVF_DEVD | ACPI_EVF_WRITE; 220 else 221 clone->flags = ACPI_EVF_NONE; 222 223 ACPI_LOCK(acpi); 224 STAILQ_INSERT_TAIL(&acpi_sc->apm_cdevs, clone, entries); 225 ACPI_UNLOCK(acpi); 226 return (clone); 227 } 228 229 static void 230 apmdtor(void *data) 231 { 232 struct apm_clone_data *clone; 233 struct acpi_softc *acpi_sc; 234 235 clone = data; 236 acpi_sc = clone->acpi_sc; 237 238 /* We are about to lose a reference so check if suspend should occur */ 239 if (acpi_sc->acpi_next_sstate != 0 && 240 clone->notify_status != APM_EV_ACKED) 241 acpi_AckSleepState(clone, 0); 242 243 /* Remove this clone's data from the list and free it. */ 244 ACPI_LOCK(acpi); 245 STAILQ_REMOVE(&acpi_sc->apm_cdevs, clone, apm_clone_data, entries); 246 seldrain(&clone->sel_read); 247 knlist_destroy(&clone->sel_read.si_note); 248 ACPI_UNLOCK(acpi); 249 free(clone, M_APMDEV); 250 } 251 252 static int 253 apmopen(struct cdev *dev, int flag, int fmt, struct thread *td) 254 { 255 struct acpi_softc *acpi_sc; 256 struct apm_clone_data *clone; 257 258 acpi_sc = devclass_get_softc(devclass_find("acpi"), 0); 259 clone = apm_create_clone(dev, acpi_sc); 260 devfs_set_cdevpriv(clone, apmdtor); 261 262 /* If the device is opened for write, record that. */ 263 if ((flag & FWRITE) != 0) 264 clone->flags |= ACPI_EVF_WRITE; 265 266 return (0); 267 } 268 269 static int 270 apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td) 271 { 272 int error; 273 struct apm_clone_data *clone; 274 struct acpi_softc *acpi_sc; 275 struct apm_info info; 276 struct apm_event_info *ev_info; 277 apm_info_old_t aiop; 278 279 error = 0; 280 devfs_get_cdevpriv((void **)&clone); 281 acpi_sc = clone->acpi_sc; 282 283 switch (cmd) { 284 case APMIO_SUSPEND: 285 if ((flag & FWRITE) == 0) 286 return (EPERM); 287 if (acpi_sc->acpi_next_sstate == 0) { 288 if (acpi_sc->acpi_suspend_sx != ACPI_STATE_S5) { 289 error = acpi_ReqSleepState(acpi_sc, 290 acpi_sc->acpi_suspend_sx); 291 } else { 292 printf( 293 "power off via apm suspend not supported\n"); 294 error = ENXIO; 295 } 296 } else 297 error = acpi_AckSleepState(clone, 0); 298 break; 299 case APMIO_STANDBY: 300 if ((flag & FWRITE) == 0) 301 return (EPERM); 302 if (acpi_sc->acpi_next_sstate == 0) { 303 if (acpi_sc->acpi_standby_sx != ACPI_STATE_S5) { 304 error = acpi_ReqSleepState(acpi_sc, 305 acpi_sc->acpi_standby_sx); 306 } else { 307 printf( 308 "power off via apm standby not supported\n"); 309 error = ENXIO; 310 } 311 } else 312 error = acpi_AckSleepState(clone, 0); 313 break; 314 case APMIO_NEXTEVENT: 315 printf("apm nextevent start\n"); 316 ACPI_LOCK(acpi); 317 if (acpi_sc->acpi_next_sstate != 0 && clone->notify_status == 318 APM_EV_NONE) { 319 ev_info = (struct apm_event_info *)addr; 320 if (acpi_sc->acpi_next_sstate <= ACPI_STATE_S3) 321 ev_info->type = PMEV_STANDBYREQ; 322 else 323 ev_info->type = PMEV_SUSPENDREQ; 324 ev_info->index = 0; 325 clone->notify_status = APM_EV_NOTIFIED; 326 printf("apm event returning %d\n", ev_info->type); 327 } else 328 error = EAGAIN; 329 ACPI_UNLOCK(acpi); 330 break; 331 case APMIO_GETINFO_OLD: 332 if (acpi_capm_get_info(&info)) 333 error = ENXIO; 334 aiop = (apm_info_old_t)addr; 335 aiop->ai_major = info.ai_major; 336 aiop->ai_minor = info.ai_minor; 337 aiop->ai_acline = info.ai_acline; 338 aiop->ai_batt_stat = info.ai_batt_stat; 339 aiop->ai_batt_life = info.ai_batt_life; 340 aiop->ai_status = info.ai_status; 341 break; 342 case APMIO_GETINFO: 343 if (acpi_capm_get_info((apm_info_t)addr)) 344 error = ENXIO; 345 break; 346 case APMIO_GETPWSTATUS: 347 if (acpi_capm_get_pwstatus((apm_pwstatus_t)addr)) 348 error = ENXIO; 349 break; 350 case APMIO_ENABLE: 351 if ((flag & FWRITE) == 0) 352 return (EPERM); 353 apm_active = 1; 354 break; 355 case APMIO_DISABLE: 356 if ((flag & FWRITE) == 0) 357 return (EPERM); 358 apm_active = 0; 359 break; 360 case APMIO_HALTCPU: 361 break; 362 case APMIO_NOTHALTCPU: 363 break; 364 case APMIO_DISPLAY: 365 if ((flag & FWRITE) == 0) 366 return (EPERM); 367 break; 368 case APMIO_BIOS: 369 if ((flag & FWRITE) == 0) 370 return (EPERM); 371 bzero(addr, sizeof(struct apm_bios_arg)); 372 break; 373 default: 374 error = EINVAL; 375 break; 376 } 377 378 return (error); 379 } 380 381 static int 382 apmwrite(struct cdev *dev, struct uio *uio, int ioflag) 383 { 384 return (uio->uio_resid); 385 } 386 387 static int 388 apmpoll(struct cdev *dev, int events, struct thread *td) 389 { 390 struct apm_clone_data *clone; 391 int revents; 392 393 revents = 0; 394 devfs_get_cdevpriv((void **)&clone); 395 ACPI_LOCK(acpi); 396 if (clone->acpi_sc->acpi_next_sstate) 397 revents |= events & (POLLIN | POLLRDNORM); 398 else 399 selrecord(td, &clone->sel_read); 400 ACPI_UNLOCK(acpi); 401 return (revents); 402 } 403 404 static int 405 apmkqfilter(struct cdev *dev, struct knote *kn) 406 { 407 struct apm_clone_data *clone; 408 409 devfs_get_cdevpriv((void **)&clone); 410 ACPI_LOCK(acpi); 411 kn->kn_hook = clone; 412 kn->kn_fop = &apm_readfiltops; 413 knlist_add(&clone->sel_read.si_note, kn, 0); 414 ACPI_UNLOCK(acpi); 415 return (0); 416 } 417 418 static void 419 apmreadfiltdetach(struct knote *kn) 420 { 421 struct apm_clone_data *clone; 422 423 ACPI_LOCK(acpi); 424 clone = kn->kn_hook; 425 knlist_remove(&clone->sel_read.si_note, kn, 0); 426 ACPI_UNLOCK(acpi); 427 } 428 429 static int 430 apmreadfilt(struct knote *kn, long hint) 431 { 432 struct apm_clone_data *clone; 433 int sleeping; 434 435 ACPI_LOCK(acpi); 436 clone = kn->kn_hook; 437 sleeping = clone->acpi_sc->acpi_next_sstate ? 1 : 0; 438 ACPI_UNLOCK(acpi); 439 return (sleeping); 440 } 441 442 void 443 acpi_apm_init(struct acpi_softc *sc) 444 { 445 446 /* Create a clone for /dev/acpi also. */ 447 STAILQ_INIT(&sc->apm_cdevs); 448 sc->acpi_clone = apm_create_clone(sc->acpi_dev_t, sc); 449 450 make_dev(&apm_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0660, "apmctl"); 451 make_dev(&apm_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0664, "apm"); 452 }
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