2 * sleep.c - ACPI sleep support.
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
9 * This file is released under the GPLv2.
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>
22 u8 sleep_states[ACPI_S_STATE_COUNT];
24 static struct pm_ops acpi_pm_ops;
26 extern void do_suspend_lowlevel(void);
28 static u32 acpi_suspend_states[] = {
29 [PM_SUSPEND_ON] = ACPI_STATE_S0,
30 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
31 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
32 [PM_SUSPEND_MAX] = ACPI_STATE_S5
35 static int init_8259A_after_S1;
37 extern int acpi_sleep_prepare(u32 acpi_state);
38 extern void acpi_power_off(void);
40 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
43 * acpi_pm_set_target - Set the target system sleep state to the state
44 * associated with given @pm_state, if supported.
47 static int acpi_pm_set_target(suspend_state_t pm_state)
49 u32 acpi_state = acpi_suspend_states[pm_state];
52 if (sleep_states[acpi_state]) {
53 acpi_target_sleep_state = acpi_state;
55 printk(KERN_ERR "ACPI does not support this state: %d\n",
63 * acpi_pm_prepare - Do preliminary suspend work.
66 * If necessary, set the firmware waking vector and do arch-specific
67 * nastiness to get the wakeup code to the waking vector.
70 static int acpi_pm_prepare(suspend_state_t pm_state)
72 int error = acpi_sleep_prepare(acpi_target_sleep_state);
75 acpi_target_sleep_state = ACPI_STATE_S0;
81 * acpi_pm_enter - Actually enter a sleep state.
84 * Flush caches and go to sleep. For STR we have to call arch-specific
85 * assembly, which in turn call acpi_enter_sleep_state().
86 * It's unfortunate, but it works. Please fix if you're feeling frisky.
89 static int acpi_pm_enter(suspend_state_t pm_state)
91 acpi_status status = AE_OK;
92 unsigned long flags = 0;
93 u32 acpi_state = acpi_target_sleep_state;
95 ACPI_FLUSH_CPU_CACHE();
97 /* Do arch specific saving of state. */
98 if (acpi_state == ACPI_STATE_S3) {
99 int error = acpi_save_state_mem();
102 acpi_target_sleep_state = ACPI_STATE_S0;
107 local_irq_save(flags);
108 acpi_enable_wakeup_device(acpi_state);
109 switch (acpi_state) {
112 status = acpi_enter_sleep_state(acpi_state);
116 do_suspend_lowlevel();
120 /* ACPI 3.0 specs (P62) says that it's the responsabilty
121 * of the OSPM to clear the status bit [ implying that the
122 * POWER_BUTTON event should not reach userspace ]
124 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
125 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
127 local_irq_restore(flags);
128 printk(KERN_DEBUG "Back to C!\n");
130 /* restore processor state */
131 if (acpi_state == ACPI_STATE_S3)
132 acpi_restore_state_mem();
134 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
138 * acpi_pm_finish - Finish up suspend sequence.
141 * This is called after we wake back up (or if entering the sleep state
145 static int acpi_pm_finish(suspend_state_t pm_state)
147 u32 acpi_state = acpi_target_sleep_state;
149 acpi_leave_sleep_state(acpi_state);
150 acpi_disable_wakeup_device(acpi_state);
152 /* reset firmware waking vector */
153 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
155 acpi_target_sleep_state = ACPI_STATE_S0;
157 if (init_8259A_after_S1) {
158 printk("Broken toshiba laptop -> kicking interrupts\n");
164 int acpi_suspend(u32 acpi_state)
166 suspend_state_t states[] = {
167 [1] = PM_SUSPEND_STANDBY,
168 [3] = PM_SUSPEND_MEM,
172 if (acpi_state < 6 && states[acpi_state])
173 return pm_suspend(states[acpi_state]);
179 static int acpi_pm_state_valid(suspend_state_t pm_state)
185 case PM_SUSPEND_STANDBY:
187 acpi_state = acpi_suspend_states[pm_state];
189 return sleep_states[acpi_state];
195 static struct pm_ops acpi_pm_ops = {
196 .valid = acpi_pm_state_valid,
197 .set_target = acpi_pm_set_target,
198 .prepare = acpi_pm_prepare,
199 .enter = acpi_pm_enter,
200 .finish = acpi_pm_finish,
203 #ifdef CONFIG_SOFTWARE_SUSPEND
204 static int acpi_hibernation_prepare(void)
206 return acpi_sleep_prepare(ACPI_STATE_S4);
209 static int acpi_hibernation_enter(void)
211 acpi_status status = AE_OK;
212 unsigned long flags = 0;
214 ACPI_FLUSH_CPU_CACHE();
216 local_irq_save(flags);
217 acpi_enable_wakeup_device(ACPI_STATE_S4);
218 /* This shouldn't return. If it returns, we have a problem */
219 status = acpi_enter_sleep_state(ACPI_STATE_S4);
220 local_irq_restore(flags);
222 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
225 static void acpi_hibernation_finish(void)
227 acpi_leave_sleep_state(ACPI_STATE_S4);
228 acpi_disable_wakeup_device(ACPI_STATE_S4);
230 /* reset firmware waking vector */
231 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
233 if (init_8259A_after_S1) {
234 printk("Broken toshiba laptop -> kicking interrupts\n");
239 static int acpi_hibernation_pre_restore(void)
243 status = acpi_hw_disable_all_gpes();
245 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
248 static void acpi_hibernation_restore_cleanup(void)
250 acpi_hw_enable_all_runtime_gpes();
253 static struct hibernation_ops acpi_hibernation_ops = {
254 .prepare = acpi_hibernation_prepare,
255 .enter = acpi_hibernation_enter,
256 .finish = acpi_hibernation_finish,
257 .pre_restore = acpi_hibernation_pre_restore,
258 .restore_cleanup = acpi_hibernation_restore_cleanup,
260 #endif /* CONFIG_SOFTWARE_SUSPEND */
263 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
264 * in the system sleep state given by %acpi_target_sleep_state
265 * @dev: device to examine
266 * @wake: if set, the device should be able to wake up the system
267 * @d_min_p: used to store the upper limit of allowed states range
268 * Return value: preferred power state of the device on success, -ENODEV on
269 * failure (ie. if there's no 'struct acpi_device' for @dev)
271 * Find the lowest power (highest number) ACPI device power state that
272 * device @dev can be in while the system is in the sleep state represented
273 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
274 * able to wake up the system from this sleep state. If @d_min_p is set,
275 * the highest power (lowest number) device power state of @dev allowed
276 * in this system sleep state is stored at the location pointed to by it.
278 * The caller must ensure that @dev is valid before using this function.
279 * The caller is also responsible for figuring out if the device is
280 * supposed to be able to wake up the system and passing this information
284 int acpi_pm_device_sleep_state(struct device *dev, int wake, int *d_min_p)
286 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
287 struct acpi_device *adev;
288 char acpi_method[] = "_SxD";
289 unsigned long d_min, d_max;
291 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
292 printk(KERN_ERR "ACPI handle has no context!\n");
296 acpi_method[2] = '0' + acpi_target_sleep_state;
298 * If the sleep state is S0, we will return D3, but if the device has
299 * _S0W, we will use the value from _S0W
301 d_min = ACPI_STATE_D0;
302 d_max = ACPI_STATE_D3;
305 * If present, _SxD methods return the minimum D-state (highest power
306 * state) we can use for the corresponding S-states. Otherwise, the
307 * minimum D-state is D0 (ACPI 3.x).
309 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
310 * provided -- that's our fault recovery, we ignore retval.
312 if (acpi_target_sleep_state > ACPI_STATE_S0)
313 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
316 * If _PRW says we can wake up the system from the target sleep state,
317 * the D-state returned by _SxD is sufficient for that (we assume a
318 * wakeup-aware driver if wake is set). Still, if _SxW exists
319 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
320 * can wake the system. _S0W may be valid, too.
322 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
323 (wake && adev->wakeup.state.enabled &&
324 adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
325 acpi_method[3] = 'W';
326 acpi_evaluate_integer(handle, acpi_method, NULL, &d_max);
338 * Toshiba fails to preserve interrupts over S1, reinitialization
339 * of 8259 is needed after S1 resume.
341 static int __init init_ints_after_s1(struct dmi_system_id *d)
343 printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
344 init_8259A_after_S1 = 1;
348 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
350 .callback = init_ints_after_s1,
351 .ident = "Toshiba Satellite 4030cdt",
352 .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
357 int __init acpi_sleep_init(void)
361 dmi_check_system(acpisleep_dmi_table);
366 printk(KERN_INFO PREFIX "(supports");
367 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
370 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
371 if (ACPI_SUCCESS(status)) {
378 pm_set_ops(&acpi_pm_ops);
380 #ifdef CONFIG_SOFTWARE_SUSPEND
381 if (sleep_states[ACPI_STATE_S4])
382 hibernation_set_ops(&acpi_hibernation_ops);
384 sleep_states[ACPI_STATE_S4] = 0;