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 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2001 Mitsuru IWASAKI 5 * 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 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/condvar.h> 35 #include <sys/conf.h> 36 #include <sys/fcntl.h> 37 #include <sys/kernel.h> 38 #include <sys/malloc.h> 39 #include <sys/poll.h> 40 #include <sys/uio.h> 41 42 #include <contrib/dev/acpica/include/acpi.h> 43 44 #include <dev/acpica/acpivar.h> 45 #include <dev/acpica/acpiio.h> 46 47 #include <machine/apm_bios.h> 48 49 /* 50 * APM driver emulation 51 */ 52 53 #define APM_UNKNOWN 0xff 54 55 static int apm_active; 56 57 static MALLOC_DEFINE(M_APMDEV, "apmdev", "APM device emulation"); 58 59 static d_open_t apmopen; 60 static d_write_t apmwrite; 61 static d_ioctl_t apmioctl; 62 static d_poll_t apmpoll; 63 static d_kqfilter_t apmkqfilter; 64 static void apmreadfiltdetach(struct knote *kn); 65 static int apmreadfilt(struct knote *kn, long hint); 66 static struct filterops apm_readfiltops = { 67 .f_isfd = 1, 68 .f_detach = apmreadfiltdetach, 69 .f_event = apmreadfilt, 70 }; 71 72 static struct cdevsw apm_cdevsw = { 73 .d_version = D_VERSION, 74 .d_open = apmopen, 75 .d_write = apmwrite, 76 .d_ioctl = apmioctl, 77 .d_poll = apmpoll, 78 .d_name = "apm", 79 .d_kqfilter = apmkqfilter 80 }; 81 82 static int 83 acpi_capm_convert_battstate(struct acpi_battinfo *battp) 84 { 85 int state; 86 87 state = APM_UNKNOWN; 88 89 if (battp->state & ACPI_BATT_STAT_DISCHARG) { 90 if (battp->cap >= 50) 91 state = 0; /* high */ 92 else 93 state = 1; /* low */ 94 } 95 if (battp->state & ACPI_BATT_STAT_CRITICAL) 96 state = 2; /* critical */ 97 if (battp->state & ACPI_BATT_STAT_CHARGING) 98 state = 3; /* charging */ 99 100 /* If still unknown, determine it based on the battery capacity. */ 101 if (state == APM_UNKNOWN) { 102 if (battp->cap >= 50) 103 state = 0; /* high */ 104 else 105 state = 1; /* low */ 106 } 107 108 return (state); 109 } 110 111 static int 112 acpi_capm_convert_battflags(struct acpi_battinfo *battp) 113 { 114 int flags; 115 116 flags = 0; 117 118 if (battp->cap >= 50) 119 flags |= APM_BATT_HIGH; 120 else { 121 if (battp->state & ACPI_BATT_STAT_CRITICAL) 122 flags |= APM_BATT_CRITICAL; 123 else 124 flags |= APM_BATT_LOW; 125 } 126 if (battp->state & ACPI_BATT_STAT_CHARGING) 127 flags |= APM_BATT_CHARGING; 128 if (battp->state == ACPI_BATT_STAT_NOT_PRESENT) 129 flags = APM_BATT_NOT_PRESENT; 130 131 return (flags); 132 } 133 134 static int 135 acpi_capm_get_info(apm_info_t aip) 136 { 137 int acline; 138 struct acpi_battinfo batt; 139 140 aip->ai_infoversion = 1; 141 aip->ai_major = 1; 142 aip->ai_minor = 2; 143 aip->ai_status = apm_active; 144 aip->ai_capabilities= 0xff00; /* unknown */ 145 146 if (acpi_acad_get_acline(&acline)) 147 aip->ai_acline = APM_UNKNOWN; /* unknown */ 148 else 149 aip->ai_acline = acline; /* on/off */ 150 151 if (acpi_battery_get_battinfo(NULL, &batt) != 0) { 152 aip->ai_batt_stat = APM_UNKNOWN; 153 aip->ai_batt_life = APM_UNKNOWN; 154 aip->ai_batt_time = -1; /* unknown */ 155 aip->ai_batteries = ~0U; /* unknown */ 156 } else { 157 aip->ai_batt_stat = acpi_capm_convert_battstate(&batt); 158 aip->ai_batt_life = batt.cap; 159 aip->ai_batt_time = (batt.min == -1) ? -1 : batt.min * 60; 160 aip->ai_batteries = acpi_battery_get_units(); 161 } 162 163 return (0); 164 } 165 166 static int 167 acpi_capm_get_pwstatus(apm_pwstatus_t app) 168 { 169 device_t dev; 170 int acline, unit, error; 171 struct acpi_battinfo batt; 172 173 if (app->ap_device != PMDV_ALLDEV && 174 (app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL)) 175 return (1); 176 177 if (app->ap_device == PMDV_ALLDEV) 178 error = acpi_battery_get_battinfo(NULL, &batt); 179 else { 180 unit = app->ap_device - PMDV_BATT0; 181 dev = devclass_get_device(devclass_find("battery"), unit); 182 if (dev != NULL) 183 error = acpi_battery_get_battinfo(dev, &batt); 184 else 185 error = ENXIO; 186 } 187 if (error) 188 return (1); 189 190 app->ap_batt_stat = acpi_capm_convert_battstate(&batt); 191 app->ap_batt_flag = acpi_capm_convert_battflags(&batt); 192 app->ap_batt_life = batt.cap; 193 app->ap_batt_time = (batt.min == -1) ? -1 : batt.min * 60; 194 195 if (acpi_acad_get_acline(&acline)) 196 app->ap_acline = APM_UNKNOWN; 197 else 198 app->ap_acline = acline; /* on/off */ 199 200 return (0); 201 } 202 203 /* Create a struct for tracking per-device suspend notification. */ 204 static struct apm_clone_data * 205 apm_create_clone(struct cdev *dev, struct acpi_softc *acpi_sc) 206 { 207 struct apm_clone_data *clone; 208 209 clone = malloc(sizeof(*clone), M_APMDEV, M_WAITOK); 210 clone->cdev = dev; 211 clone->acpi_sc = acpi_sc; 212 clone->notify_status = APM_EV_NONE; 213 bzero(&clone->sel_read, sizeof(clone->sel_read)); 214 knlist_init_mtx(&clone->sel_read.si_note, &acpi_mutex); 215 216 /* 217 * The acpi device is always managed by devd(8) and is considered 218 * writable (i.e., ack is required to allow suspend to proceed.) 219 */ 220 if (strcmp("acpi", devtoname(dev)) == 0) 221 clone->flags = ACPI_EVF_DEVD | ACPI_EVF_WRITE; 222 else 223 clone->flags = ACPI_EVF_NONE; 224 225 ACPI_LOCK(acpi); 226 STAILQ_INSERT_TAIL(&acpi_sc->apm_cdevs, clone, entries); 227 ACPI_UNLOCK(acpi); 228 return (clone); 229 } 230 231 static void 232 apmdtor(void *data) 233 { 234 struct apm_clone_data *clone; 235 struct acpi_softc *acpi_sc; 236 237 clone = data; 238 acpi_sc = clone->acpi_sc; 239 240 /* We are about to lose a reference so check if suspend should occur */ 241 if (acpi_sc->acpi_next_sstate != 0 && 242 clone->notify_status != APM_EV_ACKED) 243 acpi_AckSleepState(clone, 0); 244 245 /* Remove this clone's data from the list and free it. */ 246 ACPI_LOCK(acpi); 247 STAILQ_REMOVE(&acpi_sc->apm_cdevs, clone, apm_clone_data, entries); 248 seldrain(&clone->sel_read); 249 knlist_destroy(&clone->sel_read.si_note); 250 ACPI_UNLOCK(acpi); 251 free(clone, M_APMDEV); 252 } 253 254 static int 255 apmopen(struct cdev *dev, int flag, int fmt, struct thread *td) 256 { 257 struct acpi_softc *acpi_sc; 258 struct apm_clone_data *clone; 259 260 acpi_sc = devclass_get_softc(devclass_find("acpi"), 0); 261 clone = apm_create_clone(dev, acpi_sc); 262 devfs_set_cdevpriv(clone, apmdtor); 263 264 /* If the device is opened for write, record that. */ 265 if ((flag & FWRITE) != 0) 266 clone->flags |= ACPI_EVF_WRITE; 267 268 return (0); 269 } 270 271 static int 272 apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td) 273 { 274 int error; 275 struct apm_clone_data *clone; 276 struct acpi_softc *acpi_sc; 277 struct apm_info info; 278 struct apm_event_info *ev_info; 279 apm_info_old_t aiop; 280 281 error = 0; 282 devfs_get_cdevpriv((void **)&clone); 283 acpi_sc = clone->acpi_sc; 284 285 switch (cmd) { 286 case APMIO_SUSPEND: 287 if ((flag & FWRITE) == 0) 288 return (EPERM); 289 if (acpi_sc->acpi_next_sstate == 0) { 290 if (acpi_sc->acpi_suspend_sx != ACPI_STATE_S5) { 291 error = acpi_ReqSleepState(acpi_sc, 292 acpi_sc->acpi_suspend_sx); 293 } else { 294 printf( 295 "power off via apm suspend not supported\n"); 296 error = ENXIO; 297 } 298 } else 299 error = acpi_AckSleepState(clone, 0); 300 break; 301 case APMIO_STANDBY: 302 if ((flag & FWRITE) == 0) 303 return (EPERM); 304 if (acpi_sc->acpi_next_sstate == 0) { 305 if (acpi_sc->acpi_standby_sx != ACPI_STATE_S5) { 306 error = acpi_ReqSleepState(acpi_sc, 307 acpi_sc->acpi_standby_sx); 308 } else { 309 printf( 310 "power off via apm standby not supported\n"); 311 error = ENXIO; 312 } 313 } else 314 error = acpi_AckSleepState(clone, 0); 315 break; 316 case APMIO_NEXTEVENT: 317 printf("apm nextevent start\n"); 318 ACPI_LOCK(acpi); 319 if (acpi_sc->acpi_next_sstate != 0 && clone->notify_status == 320 APM_EV_NONE) { 321 ev_info = (struct apm_event_info *)addr; 322 if (acpi_sc->acpi_next_sstate <= ACPI_STATE_S3) 323 ev_info->type = PMEV_STANDBYREQ; 324 else 325 ev_info->type = PMEV_SUSPENDREQ; 326 ev_info->index = 0; 327 clone->notify_status = APM_EV_NOTIFIED; 328 printf("apm event returning %d\n", ev_info->type); 329 } else 330 error = EAGAIN; 331 ACPI_UNLOCK(acpi); 332 break; 333 case APMIO_GETINFO_OLD: 334 if (acpi_capm_get_info(&info)) 335 error = ENXIO; 336 aiop = (apm_info_old_t)addr; 337 aiop->ai_major = info.ai_major; 338 aiop->ai_minor = info.ai_minor; 339 aiop->ai_acline = info.ai_acline; 340 aiop->ai_batt_stat = info.ai_batt_stat; 341 aiop->ai_batt_life = info.ai_batt_life; 342 aiop->ai_status = info.ai_status; 343 break; 344 case APMIO_GETINFO: 345 if (acpi_capm_get_info((apm_info_t)addr)) 346 error = ENXIO; 347 break; 348 case APMIO_GETPWSTATUS: 349 if (acpi_capm_get_pwstatus((apm_pwstatus_t)addr)) 350 error = ENXIO; 351 break; 352 case APMIO_ENABLE: 353 if ((flag & FWRITE) == 0) 354 return (EPERM); 355 apm_active = 1; 356 break; 357 case APMIO_DISABLE: 358 if ((flag & FWRITE) == 0) 359 return (EPERM); 360 apm_active = 0; 361 break; 362 case APMIO_HALTCPU: 363 break; 364 case APMIO_NOTHALTCPU: 365 break; 366 case APMIO_DISPLAY: 367 if ((flag & FWRITE) == 0) 368 return (EPERM); 369 break; 370 case APMIO_BIOS: 371 if ((flag & FWRITE) == 0) 372 return (EPERM); 373 bzero(addr, sizeof(struct apm_bios_arg)); 374 break; 375 default: 376 error = EINVAL; 377 break; 378 } 379 380 return (error); 381 } 382 383 static int 384 apmwrite(struct cdev *dev, struct uio *uio, int ioflag) 385 { 386 return (uio->uio_resid); 387 } 388 389 static int 390 apmpoll(struct cdev *dev, int events, struct thread *td) 391 { 392 struct apm_clone_data *clone; 393 int revents; 394 395 revents = 0; 396 devfs_get_cdevpriv((void **)&clone); 397 ACPI_LOCK(acpi); 398 if (clone->acpi_sc->acpi_next_sstate) 399 revents |= events & (POLLIN | POLLRDNORM); 400 else 401 selrecord(td, &clone->sel_read); 402 ACPI_UNLOCK(acpi); 403 return (revents); 404 } 405 406 static int 407 apmkqfilter(struct cdev *dev, struct knote *kn) 408 { 409 struct apm_clone_data *clone; 410 411 devfs_get_cdevpriv((void **)&clone); 412 ACPI_LOCK(acpi); 413 kn->kn_hook = clone; 414 kn->kn_fop = &apm_readfiltops; 415 knlist_add(&clone->sel_read.si_note, kn, 0); 416 ACPI_UNLOCK(acpi); 417 return (0); 418 } 419 420 static void 421 apmreadfiltdetach(struct knote *kn) 422 { 423 struct apm_clone_data *clone; 424 425 ACPI_LOCK(acpi); 426 clone = kn->kn_hook; 427 knlist_remove(&clone->sel_read.si_note, kn, 0); 428 ACPI_UNLOCK(acpi); 429 } 430 431 static int 432 apmreadfilt(struct knote *kn, long hint) 433 { 434 struct apm_clone_data *clone; 435 int sleeping; 436 437 ACPI_LOCK(acpi); 438 clone = kn->kn_hook; 439 sleeping = clone->acpi_sc->acpi_next_sstate ? 1 : 0; 440 ACPI_UNLOCK(acpi); 441 return (sleeping); 442 } 443 444 void 445 acpi_apm_init(struct acpi_softc *sc) 446 { 447 448 /* Create a clone for /dev/acpi also. */ 449 STAILQ_INIT(&sc->apm_cdevs); 450 sc->acpi_clone = apm_create_clone(sc->acpi_dev_t, sc); 451 452 make_dev(&apm_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0660, "apmctl"); 453 make_dev(&apm_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0664, "apm"); 454 }
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