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         if (*p == NULL)
 182                 return result;
 183
 184         next = strpbrk(*p, "- :");
 185         if (next)
 186                 *next++ = '\0';
 187
 188         *value = simple_strtoul(*p, &string_end, 10);
 189
 190         /* Signal success if we got a good digit */
 191         if (string_end != *p)
 192                 result = 0;
 193
 194         if (next)
 195                 *p = next;
 196         else
 197                 *p = NULL;
 198
 199         return result;
 200 }
 201
 202 /* Read a possibly BCD register, always return binary */
 203 static u32 cmos_bcd_read(int offset, int rtc_control)
 204 {
 205         u32 val = CMOS_READ(offset);
 206         if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
 207                 BCD_TO_BIN(val);
 208         return val;
 209 }
 210
 211 /* Write binary value into possibly BCD register */
 212 static void cmos_bcd_write(u32 val, int offset, int rtc_control)
 213 {
 214         if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
 215                 BIN_TO_BCD(val);
 216         CMOS_WRITE(val, offset);
 217 }
 218
 219 static ssize_t
 220 acpi_system_write_alarm(struct file *file,
 221                         const char __user * buffer, size_t count, loff_t * ppos)
 222 {
 223         int result = 0;
 224         char alarm_string[30] = { '\0' };
 225         char *p = alarm_string;
 226         u32 sec, min, hr, day, mo, yr;
 227         int adjust = 0;
 228         unsigned char rtc_control = 0;
 229
 230         ACPI_FUNCTION_TRACE("acpi_system_write_alarm");
 231
 232         if (count > sizeof(alarm_string) - 1)
 233                 return_VALUE(-EINVAL);
 234
 235         if (copy_from_user(alarm_string, buffer, count))
 236                 return_VALUE(-EFAULT);
 237
 238         alarm_string[count] = '\0';
 239
 240         /* check for time adjustment */
 241         if (alarm_string[0] == '+') {
 242                 p++;
 243                 adjust = 1;
 244         }
 245
 246         if ((result = get_date_field(&p, &yr)))
 247                 goto end;
 248         if ((result = get_date_field(&p, &mo)))
 249                 goto end;
 250         if ((result = get_date_field(&p, &day)))
 251                 goto end;
 252         if ((result = get_date_field(&p, &hr)))
 253                 goto end;
 254         if ((result = get_date_field(&p, &min)))
 255                 goto end;
 256         if ((result = get_date_field(&p, &sec)))
 257                 goto end;
 258
 259         spin_lock_irq(&rtc_lock);
 260
 261         rtc_control = CMOS_READ(RTC_CONTROL);
 262
 263         if (adjust) {
 264                 yr += cmos_bcd_read(RTC_YEAR, rtc_control);
 265                 mo += cmos_bcd_read(RTC_MONTH, rtc_control);
 266                 day += cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
 267                 hr += cmos_bcd_read(RTC_HOURS, rtc_control);
 268                 min += cmos_bcd_read(RTC_MINUTES, rtc_control);
 269                 sec += cmos_bcd_read(RTC_SECONDS, rtc_control);
 270         }
 271
 272         spin_unlock_irq(&rtc_lock);
 273
 274         if (sec > 59) {
 275                 min += sec/60;
 276                 sec = sec%60;
 277         }
 278         if (min > 59) {
 279                 hr += min/60;
 280                 min = min%60;
 281         }
 282         if (hr > 23) {
 283                 day += hr/24;
 284                 hr = hr%24;
 285         }
 286         if (day > 31) {
 287                 mo += day/32;
 288                 day = day%32;
 289         }
 290         if (mo > 12) {
 291                 yr += mo/13;
 292                 mo = mo%13;
 293         }
 294
 295         spin_lock_irq(&rtc_lock);
 296         /*
 297          * Disable alarm interrupt before setting alarm timer or else
 298          * when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
 299          */
 300         rtc_control &= ~RTC_AIE;
 301         CMOS_WRITE(rtc_control, RTC_CONTROL);
 302         CMOS_READ(RTC_INTR_FLAGS);
 303
 304         /* write the fields the rtc knows about */
 305         cmos_bcd_write(hr, RTC_HOURS_ALARM, rtc_control);
 306         cmos_bcd_write(min, RTC_MINUTES_ALARM, rtc_control);
 307         cmos_bcd_write(sec, RTC_SECONDS_ALARM, rtc_control);
 308
 309         /*
 310          * If the system supports an enhanced alarm it will have non-zero
 311          * offsets into the CMOS RAM here -- which for some reason are pointing
 312          * to the RTC area of memory.
 313          */
 314         if (acpi_gbl_FADT.day_alarm)
 315                 cmos_bcd_write(day, acpi_gbl_FADT.day_alarm, rtc_control);
 316         if (acpi_gbl_FADT.month_alarm)
 317                 cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm, rtc_control);
 318         if (acpi_gbl_FADT.century) {
 319                 if (adjust)
 320                         yr += cmos_bcd_read(acpi_gbl_FADT.century, rtc_control) * 100;
 321                 cmos_bcd_write(yr / 100, acpi_gbl_FADT.century, rtc_control);
 322         }
 323         /* enable the rtc alarm interrupt */
 324         rtc_control |= RTC_AIE;
 325         CMOS_WRITE(rtc_control, RTC_CONTROL);
 326         CMOS_READ(RTC_INTR_FLAGS);
 327
 328         spin_unlock_irq(&rtc_lock);
 329
 330         acpi_clear_event(ACPI_EVENT_RTC);
 331         acpi_enable_event(ACPI_EVENT_RTC, 0);
 332
 333         *ppos += count;
 334
 335         result = 0;
 336       end:
 337         return_VALUE(result ? result : count);
 338 }
 339 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
 340
 341 extern struct list_head acpi_wakeup_device_list;
 342 extern spinlock_t acpi_device_lock;
 343
 344 static int
 345 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
 346 {
 347         struct list_head *node, *next;
 348
 349         seq_printf(seq, "Device\tS-state\t  Status   Sysfs node\n");
 350
 351         spin_lock(&acpi_device_lock);
 352         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 353                 struct acpi_device *dev =
 354                     container_of(node, struct acpi_device, wakeup_list);
 355                 struct device *ldev;
 356
 357                 if (!dev->wakeup.flags.valid)
 358                         continue;
 359                 spin_unlock(&acpi_device_lock);
 360
 361                 ldev = acpi_get_physical_device(dev->handle);
 362                 seq_printf(seq, "%s\t  S%d\t%c%-8s  ",
 363                            dev->pnp.bus_id,
 364                            (u32) dev->wakeup.sleep_state,
 365                            dev->wakeup.flags.run_wake ? '*' : ' ',
 366                            dev->wakeup.state.enabled ? "enabled" : "disabled");
 367                 if (ldev)
 368                         seq_printf(seq, "%s:%s",
 369                                    ldev->bus ? ldev->bus->name : "no-bus",
 370                                    ldev->bus_id);
 371                 seq_printf(seq, "\n");
 372                 put_device(ldev);
 373
 374                 spin_lock(&acpi_device_lock);
 375         }
 376         spin_unlock(&acpi_device_lock);
 377         return 0;
 378 }
 379
 380 static ssize_t
 381 acpi_system_write_wakeup_device(struct file *file,
 382                                 const char __user * buffer,
 383                                 size_t count, loff_t * ppos)
 384 {
 385         struct list_head *node, *next;
 386         char strbuf[5];
 387         char str[5] = "";
 388         int len = count;
 389         struct acpi_device *found_dev = NULL;
 390
 391         if (len > 4)
 392                 len = 4;
 393
 394         if (copy_from_user(strbuf, buffer, len))
 395                 return -EFAULT;
 396         strbuf[len] = '\0';
 397         sscanf(strbuf, "%s", str);
 398
 399         spin_lock(&acpi_device_lock);
 400         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 401                 struct acpi_device *dev =
 402                     container_of(node, struct acpi_device, wakeup_list);
 403                 if (!dev->wakeup.flags.valid)
 404                         continue;
 405
 406                 if (!strncmp(dev->pnp.bus_id, str, 4)) {
 407                         dev->wakeup.state.enabled =
 408                             dev->wakeup.state.enabled ? 0 : 1;
 409                         found_dev = dev;
 410                         break;
 411                 }
 412         }
 413         if (found_dev) {
 414                 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 415                         struct acpi_device *dev = container_of(node,
 416                                                                struct
 417                                                                acpi_device,
 418                                                                wakeup_list);
 419
 420                         if ((dev != found_dev) &&
 421                             (dev->wakeup.gpe_number ==
 422                              found_dev->wakeup.gpe_number)
 423                             && (dev->wakeup.gpe_device ==
 424                                 found_dev->wakeup.gpe_device)) {
 425                                 printk(KERN_WARNING
 426                                        "ACPI: '%s' and '%s' have the same GPE, "
 427                                        "can't disable/enable one seperately\n",
 428                                        dev->pnp.bus_id, found_dev->pnp.bus_id);
 429                                 dev->wakeup.state.enabled =
 430                                     found_dev->wakeup.state.enabled;
 431                         }
 432                 }
 433         }
 434         spin_unlock(&acpi_device_lock);
 435         return count;
 436 }
 437
 438 static int
 439 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
 440 {
 441         return single_open(file, acpi_system_wakeup_device_seq_show,
 442                            PDE(inode)->data);
 443 }
 444
 445 static const struct file_operations acpi_system_wakeup_device_fops = {
 446         .owner = THIS_MODULE,
 447         .open = acpi_system_wakeup_device_open_fs,
 448         .read = seq_read,
 449         .write = acpi_system_write_wakeup_device,
 450         .llseek = seq_lseek,
 451         .release = single_release,
 452 };
 453
 454 #ifdef  CONFIG_ACPI_PROCFS
 455 static const struct file_operations acpi_system_sleep_fops = {
 456         .owner = THIS_MODULE,
 457         .open = acpi_system_sleep_open_fs,
 458         .read = seq_read,
 459         .write = acpi_system_write_sleep,
 460         .llseek = seq_lseek,
 461         .release = single_release,
 462 };
 463 #endif                          /* CONFIG_ACPI_PROCFS */
 464
 465 #ifdef  HAVE_ACPI_LEGACY_ALARM
 466 static const struct file_operations acpi_system_alarm_fops = {
 467         .owner = THIS_MODULE,
 468         .open = acpi_system_alarm_open_fs,
 469         .read = seq_read,
 470         .write = acpi_system_write_alarm,
 471         .llseek = seq_lseek,
 472         .release = single_release,
 473 };
 474
 475 static u32 rtc_handler(void *context)
 476 {
 477         acpi_clear_event(ACPI_EVENT_RTC);
 478         acpi_disable_event(ACPI_EVENT_RTC, 0);
 479
 480         return ACPI_INTERRUPT_HANDLED;
 481 }
 482 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
 483
 484 static int __init acpi_sleep_proc_init(void)
 485 {
 486         if (acpi_disabled)
 487                 return 0;
 488
 489 #ifdef  CONFIG_ACPI_PROCFS
 490         /* 'sleep' [R/W] */
 491         proc_create("sleep", S_IFREG | S_IRUGO | S_IWUSR,
 492                     acpi_root_dir, &acpi_system_sleep_fops);
 493 #endif                          /* CONFIG_ACPI_PROCFS */
 494
 495 #ifdef  HAVE_ACPI_LEGACY_ALARM
 496         /* 'alarm' [R/W] */
 497         proc_create("alarm", S_IFREG | S_IRUGO | S_IWUSR,
 498                     acpi_root_dir, &acpi_system_alarm_fops);
 499
 500         acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
 501         /*
 502          * Disable the RTC event after installing RTC handler.
 503          * Only when RTC alarm is set will it be enabled.
 504          */
 505         acpi_clear_event(ACPI_EVENT_RTC);
 506         acpi_disable_event(ACPI_EVENT_RTC, 0);
 507 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
 508
 509         /* 'wakeup device' [R/W] */
 510         proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
 511                     acpi_root_dir, &acpi_system_wakeup_device_fops);
 512
 513         return 0;
 514 }
 515
 516 late_initcall(acpi_sleep_proc_init);