drivers/acpi/sleep/proc.c

   1 #include <linux/proc_fs.h>
   2 #include <linux/seq_file.h>
   3 #include <linux/suspend.h>
   4 #include <linux/bcd.h>
   5 #include <asm/uaccess.h>
   6
   7 #include <acpi/acpi_bus.h>
   8 #include <acpi/acpi_drivers.h>
   9
  10 #ifdef CONFIG_X86
  11 #include <linux/mc146818rtc.h>
  12 #endif
  13
  14 #include "sleep.h"
  15
  16 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  17
  18 /*
  19  * this file provides support for:
  20  * /proc/acpi/sleep
  21  * /proc/acpi/alarm
  22  * /proc/acpi/wakeup
  23  */
  24
  25 ACPI_MODULE_NAME("sleep")
  26 #ifdef  CONFIG_ACPI_PROCFS
  27 static int acpi_system_sleep_seq_show(struct seq_file *seq, void *offset)
  28 {
  29         int i;
  30
  31         ACPI_FUNCTION_TRACE("acpi_system_sleep_seq_show");
  32
  33         for (i = 0; i <= ACPI_STATE_S5; i++) {
  34                 if (sleep_states[i]) {
  35                         seq_printf(seq, "S%d ", i);
  36                 }
  37         }
  38
  39         seq_puts(seq, "\n");
  40
  41         return 0;
  42 }
  43
  44 static int acpi_system_sleep_open_fs(struct inode *inode, struct file *file)
  45 {
  46         return single_open(file, acpi_system_sleep_seq_show, PDE(inode)->data);
  47 }
  48
  49 static ssize_t
  50 acpi_system_write_sleep(struct file *file,
  51                         const char __user * buffer, size_t count, loff_t * ppos)
  52 {
  53         char str[12];
  54         u32 state = 0;
  55         int error = 0;
  56
  57         if (count > sizeof(str) - 1)
  58                 goto Done;
  59         memset(str, 0, sizeof(str));
  60         if (copy_from_user(str, buffer, count))
  61                 return -EFAULT;
  62
  63         /* Check for S4 bios request */
  64         if (!strcmp(str, "4b")) {
  65                 error = acpi_suspend(4);
  66                 goto Done;
  67         }
  68         state = simple_strtoul(str, NULL, 0);
  69 #ifdef CONFIG_HIBERNATION
  70         if (state == 4) {
  71                 error = hibernate();
  72                 goto Done;
  73         }
  74 #endif
  75         error = acpi_suspend(state);
  76       Done:
  77         return error ? error : count;
  78 }
  79 #endif                          /* CONFIG_ACPI_PROCFS */
  80
  81 #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || !defined(CONFIG_X86)
  82 /* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
  83 #else
  84 #define HAVE_ACPI_LEGACY_ALARM
  85 #endif
  86
  87 #ifdef  HAVE_ACPI_LEGACY_ALARM
  88
  89 static int acpi_system_alarm_seq_show(struct seq_file *seq, void *offset)
  90 {
  91         u32 sec, min, hr;
  92         u32 day, mo, yr, cent = 0;
  93         unsigned char rtc_control = 0;
  94         unsigned long flags;
  95
  96         ACPI_FUNCTION_TRACE("acpi_system_alarm_seq_show");
  97
  98         spin_lock_irqsave(&rtc_lock, flags);
  99
 100         sec = CMOS_READ(RTC_SECONDS_ALARM);
 101         min = CMOS_READ(RTC_MINUTES_ALARM);
 102         hr = CMOS_READ(RTC_HOURS_ALARM);
 103         rtc_control = CMOS_READ(RTC_CONTROL);
 104
 105         /* If we ever get an FACP with proper values... */
 106         if (acpi_gbl_FADT.day_alarm)
 107                 /* ACPI spec: only low 6 its should be cared */
 108                 day = CMOS_READ(acpi_gbl_FADT.day_alarm) & 0x3F;
 109         else
 110                 day = CMOS_READ(RTC_DAY_OF_MONTH);
 111         if (acpi_gbl_FADT.month_alarm)
 112                 mo = CMOS_READ(acpi_gbl_FADT.month_alarm);
 113         else
 114                 mo = CMOS_READ(RTC_MONTH);
 115         if (acpi_gbl_FADT.century)
 116                 cent = CMOS_READ(acpi_gbl_FADT.century);
 117
 118         yr = CMOS_READ(RTC_YEAR);
 119
 120         spin_unlock_irqrestore(&rtc_lock, flags);
 121
 122         if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
 123                 BCD_TO_BIN(sec);
 124                 BCD_TO_BIN(min);
 125                 BCD_TO_BIN(hr);
 126                 BCD_TO_BIN(day);
 127                 BCD_TO_BIN(mo);
 128                 BCD_TO_BIN(yr);
 129                 BCD_TO_BIN(cent);
 130         }
 131
 132         /* we're trusting the FADT (see above) */
 133         if (!acpi_gbl_FADT.century)
 134                 /* If we're not trusting the FADT, we should at least make it
 135                  * right for _this_ century... ehm, what is _this_ century?
 136                  *
 137                  * TBD:
 138                  *  ASAP: find piece of code in the kernel, e.g. star tracker driver,
 139                  *        which we can trust to determine the century correctly. Atom
 140                  *        watch driver would be nice, too...
 141                  *
 142                  *  if that has not happened, change for first release in 2050:
 143                  *        if (yr<50)
 144                  *                yr += 2100;
 145                  *        else
 146                  *                yr += 2000;   // current line of code
 147                  *
 148                  *  if that has not happened either, please do on 2099/12/31:23:59:59
 149                  *        s/2000/2100
 150                  *
 151                  */
 152                 yr += 2000;
 153         else
 154                 yr += cent * 100;
 155
 156         seq_printf(seq, "%4.4u-", yr);
 157         (mo > 12) ? seq_puts(seq, "**-") : seq_printf(seq, "%2.2u-", mo);
 158         (day > 31) ? seq_puts(seq, "** ") : seq_printf(seq, "%2.2u ", day);
 159         (hr > 23) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", hr);
 160         (min > 59) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", min);
 161         (sec > 59) ? seq_puts(seq, "**\n") : seq_printf(seq, "%2.2u\n", sec);
 162
 163         return 0;
 164 }
 165
 166 static int acpi_system_alarm_open_fs(struct inode *inode, struct file *file)
 167 {
 168         return single_open(file, acpi_system_alarm_seq_show, PDE(inode)->data);
 169 }
 170
 171 static int get_date_field(char **p, u32 * value)
 172 {
 173         char *next = NULL;
 174         char *string_end = NULL;
 175         int result = -EINVAL;
 176
 177         /*
 178          * Try to find delimeter, only to insert null.  The end of the
 179          * string won't have one, but is still valid.
 180          */
 181         next = strpbrk(*p, "- :");
 182         if (next)
 183                 *next++ = '\0';
 184
 185         *value = simple_strtoul(*p, &string_end, 10);
 186
 187         /* Signal success if we got a good digit */
 188         if (string_end != *p)
 189                 result = 0;
 190
 191         if (next)
 192                 *p = next;
 193
 194         return result;
 195 }
 196
 197 /* Read a possibly BCD register, always return binary */
 198 static u32 cmos_bcd_read(int offset, int rtc_control)
 199 {
 200         u32 val = CMOS_READ(offset);
 201         if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
 202                 BCD_TO_BIN(val);
 203         return val;
 204 }
 205
 206 /* Write binary value into possibly BCD register */
 207 static void cmos_bcd_write(u32 val, int offset, int rtc_control)
 208 {
 209         if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
 210                 BIN_TO_BCD(val);
 211         CMOS_WRITE(val, offset);
 212 }
 213
 214 static ssize_t
 215 acpi_system_write_alarm(struct file *file,
 216                         const char __user * buffer, size_t count, loff_t * ppos)
 217 {
 218         int result = 0;
 219         char alarm_string[30] = { '\0' };
 220         char *p = alarm_string;
 221         u32 sec, min, hr, day, mo, yr;
 222         int adjust = 0;
 223         unsigned char rtc_control = 0;
 224
 225         ACPI_FUNCTION_TRACE("acpi_system_write_alarm");
 226
 227         if (count > sizeof(alarm_string) - 1)
 228                 return_VALUE(-EINVAL);
 229
 230         if (copy_from_user(alarm_string, buffer, count))
 231                 return_VALUE(-EFAULT);
 232
 233         alarm_string[count] = '\0';
 234
 235         /* check for time adjustment */
 236         if (alarm_string[0] == '+') {
 237                 p++;
 238                 adjust = 1;
 239         }
 240
 241         if ((result = get_date_field(&p, &yr)))
 242                 goto end;
 243         if ((result = get_date_field(&p, &mo)))
 244                 goto end;
 245         if ((result = get_date_field(&p, &day)))
 246                 goto end;
 247         if ((result = get_date_field(&p, &hr)))
 248                 goto end;
 249         if ((result = get_date_field(&p, &min)))
 250                 goto end;
 251         if ((result = get_date_field(&p, &sec)))
 252                 goto end;
 253
 254         if (sec > 59) {
 255                 min += 1;
 256                 sec -= 60;
 257         }
 258         if (min > 59) {
 259                 hr += 1;
 260                 min -= 60;
 261         }
 262         if (hr > 23) {
 263                 day += 1;
 264                 hr -= 24;
 265         }
 266         if (day > 31) {
 267                 mo += 1;
 268                 day -= 31;
 269         }
 270         if (mo > 12) {
 271                 yr += 1;
 272                 mo -= 12;
 273         }
 274
 275         spin_lock_irq(&rtc_lock);
 276
 277         rtc_control = CMOS_READ(RTC_CONTROL);
 278
 279         if (adjust) {
 280                 yr += cmos_bcd_read(RTC_YEAR, rtc_control);
 281                 mo += cmos_bcd_read(RTC_MONTH, rtc_control);
 282                 day += cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
 283                 hr += cmos_bcd_read(RTC_HOURS, rtc_control);
 284                 min += cmos_bcd_read(RTC_MINUTES, rtc_control);
 285                 sec += cmos_bcd_read(RTC_SECONDS, rtc_control);
 286         }
 287
 288         spin_unlock_irq(&rtc_lock);
 289
 290         if (sec > 59) {
 291                 min++;
 292                 sec -= 60;
 293         }
 294         if (min > 59) {
 295                 hr++;
 296                 min -= 60;
 297         }
 298         if (hr > 23) {
 299                 day++;
 300                 hr -= 24;
 301         }
 302         if (day > 31) {
 303                 mo++;
 304                 day -= 31;
 305         }
 306         if (mo > 12) {
 307                 yr++;
 308                 mo -= 12;
 309         }
 310
 311         spin_lock_irq(&rtc_lock);
 312         /*
 313          * Disable alarm interrupt before setting alarm timer or else
 314          * when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
 315          */
 316         rtc_control &= ~RTC_AIE;
 317         CMOS_WRITE(rtc_control, RTC_CONTROL);
 318         CMOS_READ(RTC_INTR_FLAGS);
 319
 320         /* write the fields the rtc knows about */
 321         cmos_bcd_write(hr, RTC_HOURS_ALARM, rtc_control);
 322         cmos_bcd_write(min, RTC_MINUTES_ALARM, rtc_control);
 323         cmos_bcd_write(sec, RTC_SECONDS_ALARM, rtc_control);
 324
 325         /*
 326          * If the system supports an enhanced alarm it will have non-zero
 327          * offsets into the CMOS RAM here -- which for some reason are pointing
 328          * to the RTC area of memory.
 329          */
 330         if (acpi_gbl_FADT.day_alarm)
 331                 cmos_bcd_write(day, acpi_gbl_FADT.day_alarm, rtc_control);
 332         if (acpi_gbl_FADT.month_alarm)
 333                 cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm, rtc_control);
 334         if (acpi_gbl_FADT.century)
 335                 cmos_bcd_write(yr / 100, acpi_gbl_FADT.century, rtc_control);
 336         /* enable the rtc alarm interrupt */
 337         rtc_control |= RTC_AIE;
 338         CMOS_WRITE(rtc_control, RTC_CONTROL);
 339         CMOS_READ(RTC_INTR_FLAGS);
 340
 341         spin_unlock_irq(&rtc_lock);
 342
 343         acpi_clear_event(ACPI_EVENT_RTC);
 344         acpi_enable_event(ACPI_EVENT_RTC, 0);
 345
 346         *ppos += count;
 347
 348         result = 0;
 349       end:
 350         return_VALUE(result ? result : count);
 351 }
 352 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
 353
 354 extern struct list_head acpi_wakeup_device_list;
 355 extern spinlock_t acpi_device_lock;
 356
 357 static int
 358 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
 359 {
 360         struct list_head *node, *next;
 361
 362         seq_printf(seq, "Device\tS-state\t  Status   Sysfs node\n");
 363
 364         spin_lock(&acpi_device_lock);
 365         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 366                 struct acpi_device *dev =
 367                     container_of(node, struct acpi_device, wakeup_list);
 368                 struct device *ldev;
 369
 370                 if (!dev->wakeup.flags.valid)
 371                         continue;
 372                 spin_unlock(&acpi_device_lock);
 373
 374                 ldev = acpi_get_physical_device(dev->handle);
 375                 seq_printf(seq, "%s\t  S%d\t%c%-8s  ",
 376                            dev->pnp.bus_id,
 377                            (u32) dev->wakeup.sleep_state,
 378                            dev->wakeup.flags.run_wake ? '*' : ' ',
 379                            dev->wakeup.state.enabled ? "enabled" : "disabled");
 380                 if (ldev)
 381                         seq_printf(seq, "%s:%s",
 382                                    ldev->bus ? ldev->bus->name : "no-bus",
 383                                    ldev->bus_id);
 384                 seq_printf(seq, "\n");
 385                 put_device(ldev);
 386
 387                 spin_lock(&acpi_device_lock);
 388         }
 389         spin_unlock(&acpi_device_lock);
 390         return 0;
 391 }
 392
 393 static ssize_t
 394 acpi_system_write_wakeup_device(struct file *file,
 395                                 const char __user * buffer,
 396                                 size_t count, loff_t * ppos)
 397 {
 398         struct list_head *node, *next;
 399         char strbuf[5];
 400         char str[5] = "";
 401         int len = count;
 402         struct acpi_device *found_dev = NULL;
 403
 404         if (len > 4)
 405                 len = 4;
 406
 407         if (copy_from_user(strbuf, buffer, len))
 408                 return -EFAULT;
 409         strbuf[len] = '\0';
 410         sscanf(strbuf, "%s", str);
 411
 412         spin_lock(&acpi_device_lock);
 413         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 414                 struct acpi_device *dev =
 415                     container_of(node, struct acpi_device, wakeup_list);
 416                 if (!dev->wakeup.flags.valid)
 417                         continue;
 418
 419                 if (!strncmp(dev->pnp.bus_id, str, 4)) {
 420                         dev->wakeup.state.enabled =
 421                             dev->wakeup.state.enabled ? 0 : 1;
 422                         found_dev = dev;
 423                         break;
 424                 }
 425         }
 426         if (found_dev) {
 427                 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 428                         struct acpi_device *dev = container_of(node,
 429                                                                struct
 430                                                                acpi_device,
 431                                                                wakeup_list);
 432
 433                         if ((dev != found_dev) &&
 434                             (dev->wakeup.gpe_number ==
 435                              found_dev->wakeup.gpe_number)
 436                             && (dev->wakeup.gpe_device ==
 437                                 found_dev->wakeup.gpe_device)) {
 438                                 printk(KERN_WARNING
 439                                        "ACPI: '%s' and '%s' have the same GPE, "
 440                                        "can't disable/enable one seperately\n",
 441                                        dev->pnp.bus_id, found_dev->pnp.bus_id);
 442                                 dev->wakeup.state.enabled =
 443                                     found_dev->wakeup.state.enabled;
 444                         }
 445                 }
 446         }
 447         spin_unlock(&acpi_device_lock);
 448         return count;
 449 }
 450
 451 static int
 452 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
 453 {
 454         return single_open(file, acpi_system_wakeup_device_seq_show,
 455                            PDE(inode)->data);
 456 }
 457
 458 static const struct file_operations acpi_system_wakeup_device_fops = {
 459         .open = acpi_system_wakeup_device_open_fs,
 460         .read = seq_read,
 461         .write = acpi_system_write_wakeup_device,
 462         .llseek = seq_lseek,
 463         .release = single_release,
 464 };
 465
 466 #ifdef  CONFIG_ACPI_PROCFS
 467 static const struct file_operations acpi_system_sleep_fops = {
 468         .open = acpi_system_sleep_open_fs,
 469         .read = seq_read,
 470         .write = acpi_system_write_sleep,
 471         .llseek = seq_lseek,
 472         .release = single_release,
 473 };
 474 #endif                          /* CONFIG_ACPI_PROCFS */
 475
 476 #ifdef  HAVE_ACPI_LEGACY_ALARM
 477 static const struct file_operations acpi_system_alarm_fops = {
 478         .open = acpi_system_alarm_open_fs,
 479         .read = seq_read,
 480         .write = acpi_system_write_alarm,
 481         .llseek = seq_lseek,
 482         .release = single_release,
 483 };
 484
 485 static u32 rtc_handler(void *context)
 486 {
 487         acpi_clear_event(ACPI_EVENT_RTC);
 488         acpi_disable_event(ACPI_EVENT_RTC, 0);
 489
 490         return ACPI_INTERRUPT_HANDLED;
 491 }
 492 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
 493
 494 static int __init acpi_sleep_proc_init(void)
 495 {
 496         struct proc_dir_entry *entry = NULL;
 497
 498         if (acpi_disabled)
 499                 return 0;
 500
 501 #ifdef  CONFIG_ACPI_PROCFS
 502         /* 'sleep' [R/W] */
 503         entry =
 504             create_proc_entry("sleep", S_IFREG | S_IRUGO | S_IWUSR,
 505                               acpi_root_dir);
 506         if (entry)
 507                 entry->proc_fops = &acpi_system_sleep_fops;
 508 #endif                          /* CONFIG_ACPI_PROCFS */
 509
 510 #ifdef  HAVE_ACPI_LEGACY_ALARM
 511         /* 'alarm' [R/W] */
 512         entry =
 513             create_proc_entry("alarm", S_IFREG | S_IRUGO | S_IWUSR,
 514                               acpi_root_dir);
 515         if (entry)
 516                 entry->proc_fops = &acpi_system_alarm_fops;
 517
 518         acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
 519 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
 520
 521         /* 'wakeup device' [R/W] */
 522         entry =
 523             create_proc_entry("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
 524                               acpi_root_dir);
 525         if (entry)
 526                 entry->proc_fops = &acpi_system_wakeup_device_fops;
 527
 528         return 0;
 529 }
 530
 531 late_initcall(acpi_sleep_proc_init);