drivers/acpi/sleep/main.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   5  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   6  * Copyright (c) 2000-2003 Patrick Mochel
   7  * Copyright (c) 2003 Open Source Development Lab
   8  *
   9  * This file is released under the GPLv2.
  10  *
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/irq.h>
  15 #include <linux/dmi.h>
  16 #include <linux/device.h>
  17 #include <linux/suspend.h>
  18 #include <acpi/acpi_bus.h>
  19 #include <acpi/acpi_drivers.h>
  20 #include "sleep.h"
  21
  22 u8 sleep_states[ACPI_S_STATE_COUNT];
  23
  24 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  25
  26 #ifdef CONFIG_SUSPEND
  27 static struct pm_ops acpi_pm_ops;
  28
  29 extern void do_suspend_lowlevel(void);
  30
  31 static u32 acpi_suspend_states[] = {
  32         [PM_SUSPEND_ON] = ACPI_STATE_S0,
  33         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
  34         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
  35         [PM_SUSPEND_MAX] = ACPI_STATE_S5
  36 };
  37
  38 static int init_8259A_after_S1;
  39
  40 /**
  41  *      acpi_pm_set_target - Set the target system sleep state to the state
  42  *              associated with given @pm_state, if supported.
  43  */
  44
  45 static int acpi_pm_set_target(suspend_state_t pm_state)
  46 {
  47         u32 acpi_state = acpi_suspend_states[pm_state];
  48         int error = 0;
  49
  50         if (sleep_states[acpi_state]) {
  51                 acpi_target_sleep_state = acpi_state;
  52         } else {
  53                 printk(KERN_ERR "ACPI does not support this state: %d\n",
  54                         pm_state);
  55                 error = -ENOSYS;
  56         }
  57         return error;
  58 }
  59
  60 /**
  61  *      acpi_pm_prepare - Do preliminary suspend work.
  62  *      @pm_state: ignored
  63  *
  64  *      If necessary, set the firmware waking vector and do arch-specific
  65  *      nastiness to get the wakeup code to the waking vector.
  66  */
  67
  68 static int acpi_pm_prepare(suspend_state_t pm_state)
  69 {
  70         int error = acpi_sleep_prepare(acpi_target_sleep_state);
  71
  72         if (error)
  73                 acpi_target_sleep_state = ACPI_STATE_S0;
  74
  75         return error;
  76 }
  77
  78 /**
  79  *      acpi_pm_enter - Actually enter a sleep state.
  80  *      @pm_state: ignored
  81  *
  82  *      Flush caches and go to sleep. For STR we have to call arch-specific
  83  *      assembly, which in turn call acpi_enter_sleep_state().
  84  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
  85  */
  86
  87 static int acpi_pm_enter(suspend_state_t pm_state)
  88 {
  89         acpi_status status = AE_OK;
  90         unsigned long flags = 0;
  91         u32 acpi_state = acpi_target_sleep_state;
  92
  93         ACPI_FLUSH_CPU_CACHE();
  94
  95         /* Do arch specific saving of state. */
  96         if (acpi_state == ACPI_STATE_S3) {
  97                 int error = acpi_save_state_mem();
  98
  99                 if (error) {
 100                         acpi_target_sleep_state = ACPI_STATE_S0;
 101                         return error;
 102                 }
 103         }
 104
 105         local_irq_save(flags);
 106         acpi_enable_wakeup_device(acpi_state);
 107         switch (acpi_state) {
 108         case ACPI_STATE_S1:
 109                 barrier();
 110                 status = acpi_enter_sleep_state(acpi_state);
 111                 break;
 112
 113         case ACPI_STATE_S3:
 114                 do_suspend_lowlevel();
 115                 break;
 116         }
 117
 118         /* ACPI 3.0 specs (P62) says that it's the responsabilty
 119          * of the OSPM to clear the status bit [ implying that the
 120          * POWER_BUTTON event should not reach userspace ]
 121          */
 122         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 123                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 124
 125         local_irq_restore(flags);
 126         printk(KERN_DEBUG "Back to C!\n");
 127
 128         /* restore processor state */
 129         if (acpi_state == ACPI_STATE_S3)
 130                 acpi_restore_state_mem();
 131
 132         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 133 }
 134
 135 /**
 136  *      acpi_pm_finish - Finish up suspend sequence.
 137  *      @pm_state: ignored
 138  *
 139  *      This is called after we wake back up (or if entering the sleep state
 140  *      failed).
 141  */
 142
 143 static int acpi_pm_finish(suspend_state_t pm_state)
 144 {
 145         u32 acpi_state = acpi_target_sleep_state;
 146
 147         acpi_leave_sleep_state(acpi_state);
 148         acpi_disable_wakeup_device(acpi_state);
 149
 150         /* reset firmware waking vector */
 151         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 152
 153         acpi_target_sleep_state = ACPI_STATE_S0;
 154
 155 #ifdef CONFIG_X86
 156         if (init_8259A_after_S1) {
 157                 printk("Broken toshiba laptop -> kicking interrupts\n");
 158                 init_8259A(0);
 159         }
 160 #endif
 161         return 0;
 162 }
 163
 164 static int acpi_pm_state_valid(suspend_state_t pm_state)
 165 {
 166         u32 acpi_state;
 167
 168         switch (pm_state) {
 169         case PM_SUSPEND_ON:
 170         case PM_SUSPEND_STANDBY:
 171         case PM_SUSPEND_MEM:
 172                 acpi_state = acpi_suspend_states[pm_state];
 173
 174                 return sleep_states[acpi_state];
 175         default:
 176                 return 0;
 177         }
 178 }
 179
 180 static struct pm_ops acpi_pm_ops = {
 181         .valid = acpi_pm_state_valid,
 182         .set_target = acpi_pm_set_target,
 183         .prepare = acpi_pm_prepare,
 184         .enter = acpi_pm_enter,
 185         .finish = acpi_pm_finish,
 186 };
 187
 188 /*
 189  * Toshiba fails to preserve interrupts over S1, reinitialization
 190  * of 8259 is needed after S1 resume.
 191  */
 192 static int __init init_ints_after_s1(struct dmi_system_id *d)
 193 {
 194         printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
 195         init_8259A_after_S1 = 1;
 196         return 0;
 197 }
 198
 199 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 200         {
 201          .callback = init_ints_after_s1,
 202          .ident = "Toshiba Satellite 4030cdt",
 203          .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
 204          },
 205         {},
 206 };
 207 #endif /* CONFIG_SUSPEND */
 208
 209 #ifdef CONFIG_HIBERNATION
 210 static int acpi_hibernation_prepare(void)
 211 {
 212         return acpi_sleep_prepare(ACPI_STATE_S4);
 213 }
 214
 215 static int acpi_hibernation_enter(void)
 216 {
 217         acpi_status status = AE_OK;
 218         unsigned long flags = 0;
 219
 220         ACPI_FLUSH_CPU_CACHE();
 221
 222         local_irq_save(flags);
 223         acpi_enable_wakeup_device(ACPI_STATE_S4);
 224         /* This shouldn't return.  If it returns, we have a problem */
 225         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 226         local_irq_restore(flags);
 227
 228         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 229 }
 230
 231 static void acpi_hibernation_finish(void)
 232 {
 233         acpi_leave_sleep_state(ACPI_STATE_S4);
 234         acpi_disable_wakeup_device(ACPI_STATE_S4);
 235
 236         /* reset firmware waking vector */
 237         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 238 }
 239
 240 static int acpi_hibernation_pre_restore(void)
 241 {
 242         acpi_status status;
 243
 244         status = acpi_hw_disable_all_gpes();
 245
 246         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 247 }
 248
 249 static void acpi_hibernation_restore_cleanup(void)
 250 {
 251         acpi_hw_enable_all_runtime_gpes();
 252 }
 253
 254 static struct hibernation_ops acpi_hibernation_ops = {
 255         .prepare = acpi_hibernation_prepare,
 256         .enter = acpi_hibernation_enter,
 257         .finish = acpi_hibernation_finish,
 258         .pre_restore = acpi_hibernation_pre_restore,
 259         .restore_cleanup = acpi_hibernation_restore_cleanup,
 260 };
 261 #endif                          /* CONFIG_HIBERNATION */
 262
 263 int acpi_suspend(u32 acpi_state)
 264 {
 265         suspend_state_t states[] = {
 266                 [1] = PM_SUSPEND_STANDBY,
 267                 [3] = PM_SUSPEND_MEM,
 268                 [5] = PM_SUSPEND_MAX
 269         };
 270
 271         if (acpi_state < 6 && states[acpi_state])
 272                 return pm_suspend(states[acpi_state]);
 273         if (acpi_state == 4)
 274                 return hibernate();
 275         return -EINVAL;
 276 }
 277
 278 /**
 279  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 280  *              in the system sleep state given by %acpi_target_sleep_state
 281  *      @dev: device to examine
 282  *      @wake: if set, the device should be able to wake up the system
 283  *      @d_min_p: used to store the upper limit of allowed states range
 284  *      Return value: preferred power state of the device on success, -ENODEV on
 285  *              failure (ie. if there's no 'struct acpi_device' for @dev)
 286  *
 287  *      Find the lowest power (highest number) ACPI device power state that
 288  *      device @dev can be in while the system is in the sleep state represented
 289  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 290  *      able to wake up the system from this sleep state.  If @d_min_p is set,
 291  *      the highest power (lowest number) device power state of @dev allowed
 292  *      in this system sleep state is stored at the location pointed to by it.
 293  *
 294  *      The caller must ensure that @dev is valid before using this function.
 295  *      The caller is also responsible for figuring out if the device is
 296  *      supposed to be able to wake up the system and passing this information
 297  *      via @wake.
 298  */
 299
 300 int acpi_pm_device_sleep_state(struct device *dev, int wake, int *d_min_p)
 301 {
 302         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 303         struct acpi_device *adev;
 304         char acpi_method[] = "_SxD";
 305         unsigned long d_min, d_max;
 306
 307         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 308                 printk(KERN_DEBUG "ACPI handle has no context!\n");
 309                 return -ENODEV;
 310         }
 311
 312         acpi_method[2] = '0' + acpi_target_sleep_state;
 313         /*
 314          * If the sleep state is S0, we will return D3, but if the device has
 315          * _S0W, we will use the value from _S0W
 316          */
 317         d_min = ACPI_STATE_D0;
 318         d_max = ACPI_STATE_D3;
 319
 320         /*
 321          * If present, _SxD methods return the minimum D-state (highest power
 322          * state) we can use for the corresponding S-states.  Otherwise, the
 323          * minimum D-state is D0 (ACPI 3.x).
 324          *
 325          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 326          * provided -- that's our fault recovery, we ignore retval.
 327          */
 328         if (acpi_target_sleep_state > ACPI_STATE_S0)
 329                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 330
 331         /*
 332          * If _PRW says we can wake up the system from the target sleep state,
 333          * the D-state returned by _SxD is sufficient for that (we assume a
 334          * wakeup-aware driver if wake is set).  Still, if _SxW exists
 335          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 336          * can wake the system.  _S0W may be valid, too.
 337          */
 338         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 339             (wake && adev->wakeup.state.enabled &&
 340              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
 341                 acpi_method[3] = 'W';
 342                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_max);
 343                 /* Sanity check */
 344                 if (d_max < d_min)
 345                         d_min = d_max;
 346         }
 347
 348         if (d_min_p)
 349                 *d_min_p = d_min;
 350         return d_max;
 351 }
 352
 353 int __init acpi_sleep_init(void)
 354 {
 355         acpi_status status;
 356         u8 type_a, type_b;
 357 #ifdef CONFIG_SUSPEND
 358         int i = 0;
 359
 360         dmi_check_system(acpisleep_dmi_table);
 361 #endif
 362
 363         if (acpi_disabled)
 364                 return 0;
 365
 366 #ifdef CONFIG_SUSPEND
 367         printk(KERN_INFO PREFIX "(supports");
 368         for (i = ACPI_STATE_S0; i < ACPI_STATE_S4; i++) {
 369                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 370                 if (ACPI_SUCCESS(status)) {
 371                         sleep_states[i] = 1;
 372                         printk(" S%d", i);
 373                 }
 374         }
 375         printk(")\n");
 376
 377         pm_set_ops(&acpi_pm_ops);
 378 #endif
 379
 380 #ifdef CONFIG_HIBERNATION
 381         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 382         if (ACPI_SUCCESS(status)) {
 383                 hibernation_set_ops(&acpi_hibernation_ops);
 384                 sleep_states[ACPI_STATE_S4] = 1;
 385         }
 386 #else
 387         sleep_states[ACPI_STATE_S4] = 0;
 388 #endif
 389
 390         return 0;
 391 }