]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * sleep.c - ACPI sleep support. | |
3 | * | |
e2a5b420 | 4 | * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> |
1da177e4 LT |
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> | |
1da177e4 LT |
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 struct pm_ops acpi_pm_ops; | |
25 | ||
1da177e4 LT |
26 | extern void do_suspend_lowlevel(void); |
27 | ||
28 | static u32 acpi_suspend_states[] = { | |
e2a5b420 AS |
29 | [PM_SUSPEND_ON] = ACPI_STATE_S0, |
30 | [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, | |
31 | [PM_SUSPEND_MEM] = ACPI_STATE_S3, | |
e2a5b420 | 32 | [PM_SUSPEND_MAX] = ACPI_STATE_S5 |
1da177e4 LT |
33 | }; |
34 | ||
35 | static int init_8259A_after_S1; | |
36 | ||
e9b3aba8 RW |
37 | extern int acpi_sleep_prepare(u32 acpi_state); |
38 | extern void acpi_power_off(void); | |
39 | ||
40 | static u32 acpi_target_sleep_state = ACPI_STATE_S0; | |
41 | ||
42 | /** | |
43 | * acpi_pm_set_target - Set the target system sleep state to the state | |
44 | * associated with given @pm_state, if supported. | |
45 | */ | |
46 | ||
47 | static int acpi_pm_set_target(suspend_state_t pm_state) | |
48 | { | |
49 | u32 acpi_state = acpi_suspend_states[pm_state]; | |
50 | int error = 0; | |
51 | ||
52 | if (sleep_states[acpi_state]) { | |
53 | acpi_target_sleep_state = acpi_state; | |
54 | } else { | |
55 | printk(KERN_ERR "ACPI does not support this state: %d\n", | |
56 | pm_state); | |
57 | error = -ENOSYS; | |
58 | } | |
59 | return error; | |
60 | } | |
61 | ||
1da177e4 LT |
62 | /** |
63 | * acpi_pm_prepare - Do preliminary suspend work. | |
e9b3aba8 | 64 | * @pm_state: ignored |
1da177e4 | 65 | * |
e9b3aba8 RW |
66 | * If necessary, set the firmware waking vector and do arch-specific |
67 | * nastiness to get the wakeup code to the waking vector. | |
1da177e4 LT |
68 | */ |
69 | ||
70 | static int acpi_pm_prepare(suspend_state_t pm_state) | |
71 | { | |
e9b3aba8 | 72 | int error = acpi_sleep_prepare(acpi_target_sleep_state); |
1da177e4 | 73 | |
e9b3aba8 RW |
74 | if (error) |
75 | acpi_target_sleep_state = ACPI_STATE_S0; | |
76 | ||
77 | return error; | |
1da177e4 LT |
78 | } |
79 | ||
1da177e4 LT |
80 | /** |
81 | * acpi_pm_enter - Actually enter a sleep state. | |
e9b3aba8 | 82 | * @pm_state: ignored |
1da177e4 | 83 | * |
50ad147a RW |
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(). | |
1da177e4 LT |
86 | * It's unfortunate, but it works. Please fix if you're feeling frisky. |
87 | */ | |
88 | ||
89 | static int acpi_pm_enter(suspend_state_t pm_state) | |
90 | { | |
91 | acpi_status status = AE_OK; | |
92 | unsigned long flags = 0; | |
e9b3aba8 | 93 | u32 acpi_state = acpi_target_sleep_state; |
1da177e4 LT |
94 | |
95 | ACPI_FLUSH_CPU_CACHE(); | |
96 | ||
97 | /* Do arch specific saving of state. */ | |
50ad147a | 98 | if (acpi_state == ACPI_STATE_S3) { |
1da177e4 | 99 | int error = acpi_save_state_mem(); |
e9b3aba8 RW |
100 | |
101 | if (error) { | |
102 | acpi_target_sleep_state = ACPI_STATE_S0; | |
1da177e4 | 103 | return error; |
e9b3aba8 | 104 | } |
1da177e4 LT |
105 | } |
106 | ||
1da177e4 LT |
107 | local_irq_save(flags); |
108 | acpi_enable_wakeup_device(acpi_state); | |
e9b3aba8 RW |
109 | switch (acpi_state) { |
110 | case ACPI_STATE_S1: | |
1da177e4 LT |
111 | barrier(); |
112 | status = acpi_enter_sleep_state(acpi_state); | |
113 | break; | |
114 | ||
e9b3aba8 | 115 | case ACPI_STATE_S3: |
1da177e4 LT |
116 | do_suspend_lowlevel(); |
117 | break; | |
1da177e4 | 118 | } |
872d83d0 AP |
119 | |
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 ] | |
123 | */ | |
124 | if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) | |
125 | acpi_clear_event(ACPI_EVENT_POWER_BUTTON); | |
126 | ||
1da177e4 LT |
127 | local_irq_restore(flags); |
128 | printk(KERN_DEBUG "Back to C!\n"); | |
129 | ||
e9b3aba8 | 130 | /* restore processor state */ |
50ad147a | 131 | if (acpi_state == ACPI_STATE_S3) |
1da177e4 LT |
132 | acpi_restore_state_mem(); |
133 | ||
1da177e4 LT |
134 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; |
135 | } | |
136 | ||
1da177e4 LT |
137 | /** |
138 | * acpi_pm_finish - Finish up suspend sequence. | |
e9b3aba8 | 139 | * @pm_state: ignored |
1da177e4 LT |
140 | * |
141 | * This is called after we wake back up (or if entering the sleep state | |
142 | * failed). | |
143 | */ | |
144 | ||
145 | static int acpi_pm_finish(suspend_state_t pm_state) | |
146 | { | |
e9b3aba8 | 147 | u32 acpi_state = acpi_target_sleep_state; |
1da177e4 LT |
148 | |
149 | acpi_leave_sleep_state(acpi_state); | |
150 | acpi_disable_wakeup_device(acpi_state); | |
151 | ||
152 | /* reset firmware waking vector */ | |
153 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); | |
154 | ||
e9b3aba8 RW |
155 | acpi_target_sleep_state = ACPI_STATE_S0; |
156 | ||
e8b2fd01 | 157 | #ifdef CONFIG_X86 |
1da177e4 LT |
158 | if (init_8259A_after_S1) { |
159 | printk("Broken toshiba laptop -> kicking interrupts\n"); | |
160 | init_8259A(0); | |
161 | } | |
e8b2fd01 | 162 | #endif |
1da177e4 LT |
163 | return 0; |
164 | } | |
165 | ||
1da177e4 LT |
166 | int acpi_suspend(u32 acpi_state) |
167 | { | |
168 | suspend_state_t states[] = { | |
e2a5b420 AS |
169 | [1] = PM_SUSPEND_STANDBY, |
170 | [3] = PM_SUSPEND_MEM, | |
e2a5b420 | 171 | [5] = PM_SUSPEND_MAX |
1da177e4 LT |
172 | }; |
173 | ||
e2a5b420 | 174 | if (acpi_state < 6 && states[acpi_state]) |
1da177e4 | 175 | return pm_suspend(states[acpi_state]); |
a3d25c27 RW |
176 | if (acpi_state == 4) |
177 | return hibernate(); | |
1da177e4 LT |
178 | return -EINVAL; |
179 | } | |
180 | ||
eb9289eb SL |
181 | static int acpi_pm_state_valid(suspend_state_t pm_state) |
182 | { | |
e8c9c502 | 183 | u32 acpi_state; |
eb9289eb | 184 | |
e8c9c502 JB |
185 | switch (pm_state) { |
186 | case PM_SUSPEND_ON: | |
187 | case PM_SUSPEND_STANDBY: | |
188 | case PM_SUSPEND_MEM: | |
189 | acpi_state = acpi_suspend_states[pm_state]; | |
190 | ||
191 | return sleep_states[acpi_state]; | |
192 | default: | |
193 | return 0; | |
194 | } | |
eb9289eb SL |
195 | } |
196 | ||
1da177e4 | 197 | static struct pm_ops acpi_pm_ops = { |
eb9289eb | 198 | .valid = acpi_pm_state_valid, |
e9b3aba8 | 199 | .set_target = acpi_pm_set_target, |
e2a5b420 AS |
200 | .prepare = acpi_pm_prepare, |
201 | .enter = acpi_pm_enter, | |
202 | .finish = acpi_pm_finish, | |
1da177e4 LT |
203 | }; |
204 | ||
b0cb1a19 | 205 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
206 | static int acpi_hibernation_prepare(void) |
207 | { | |
208 | return acpi_sleep_prepare(ACPI_STATE_S4); | |
209 | } | |
210 | ||
211 | static int acpi_hibernation_enter(void) | |
212 | { | |
213 | acpi_status status = AE_OK; | |
214 | unsigned long flags = 0; | |
215 | ||
216 | ACPI_FLUSH_CPU_CACHE(); | |
217 | ||
218 | local_irq_save(flags); | |
219 | acpi_enable_wakeup_device(ACPI_STATE_S4); | |
220 | /* This shouldn't return. If it returns, we have a problem */ | |
221 | status = acpi_enter_sleep_state(ACPI_STATE_S4); | |
222 | local_irq_restore(flags); | |
223 | ||
224 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
225 | } | |
226 | ||
227 | static void acpi_hibernation_finish(void) | |
228 | { | |
229 | acpi_leave_sleep_state(ACPI_STATE_S4); | |
230 | acpi_disable_wakeup_device(ACPI_STATE_S4); | |
231 | ||
232 | /* reset firmware waking vector */ | |
233 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); | |
a3d25c27 RW |
234 | } |
235 | ||
a634cc10 RW |
236 | static int acpi_hibernation_pre_restore(void) |
237 | { | |
238 | acpi_status status; | |
239 | ||
240 | status = acpi_hw_disable_all_gpes(); | |
241 | ||
242 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
243 | } | |
244 | ||
245 | static void acpi_hibernation_restore_cleanup(void) | |
246 | { | |
247 | acpi_hw_enable_all_runtime_gpes(); | |
248 | } | |
249 | ||
a3d25c27 RW |
250 | static struct hibernation_ops acpi_hibernation_ops = { |
251 | .prepare = acpi_hibernation_prepare, | |
252 | .enter = acpi_hibernation_enter, | |
253 | .finish = acpi_hibernation_finish, | |
a634cc10 RW |
254 | .pre_restore = acpi_hibernation_pre_restore, |
255 | .restore_cleanup = acpi_hibernation_restore_cleanup, | |
a3d25c27 | 256 | }; |
b0cb1a19 | 257 | #endif /* CONFIG_HIBERNATION */ |
a3d25c27 | 258 | |
fd4aff1a SL |
259 | /** |
260 | * acpi_pm_device_sleep_state - return preferred power state of ACPI device | |
261 | * in the system sleep state given by %acpi_target_sleep_state | |
262 | * @dev: device to examine | |
263 | * @wake: if set, the device should be able to wake up the system | |
264 | * @d_min_p: used to store the upper limit of allowed states range | |
265 | * Return value: preferred power state of the device on success, -ENODEV on | |
266 | * failure (ie. if there's no 'struct acpi_device' for @dev) | |
267 | * | |
268 | * Find the lowest power (highest number) ACPI device power state that | |
269 | * device @dev can be in while the system is in the sleep state represented | |
270 | * by %acpi_target_sleep_state. If @wake is nonzero, the device should be | |
271 | * able to wake up the system from this sleep state. If @d_min_p is set, | |
272 | * the highest power (lowest number) device power state of @dev allowed | |
273 | * in this system sleep state is stored at the location pointed to by it. | |
274 | * | |
275 | * The caller must ensure that @dev is valid before using this function. | |
276 | * The caller is also responsible for figuring out if the device is | |
277 | * supposed to be able to wake up the system and passing this information | |
278 | * via @wake. | |
279 | */ | |
280 | ||
281 | int acpi_pm_device_sleep_state(struct device *dev, int wake, int *d_min_p) | |
282 | { | |
283 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); | |
284 | struct acpi_device *adev; | |
285 | char acpi_method[] = "_SxD"; | |
286 | unsigned long d_min, d_max; | |
287 | ||
288 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
289 | printk(KERN_ERR "ACPI handle has no context!\n"); | |
290 | return -ENODEV; | |
291 | } | |
292 | ||
293 | acpi_method[2] = '0' + acpi_target_sleep_state; | |
294 | /* | |
295 | * If the sleep state is S0, we will return D3, but if the device has | |
296 | * _S0W, we will use the value from _S0W | |
297 | */ | |
298 | d_min = ACPI_STATE_D0; | |
299 | d_max = ACPI_STATE_D3; | |
300 | ||
301 | /* | |
302 | * If present, _SxD methods return the minimum D-state (highest power | |
303 | * state) we can use for the corresponding S-states. Otherwise, the | |
304 | * minimum D-state is D0 (ACPI 3.x). | |
305 | * | |
306 | * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer | |
307 | * provided -- that's our fault recovery, we ignore retval. | |
308 | */ | |
309 | if (acpi_target_sleep_state > ACPI_STATE_S0) | |
310 | acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); | |
311 | ||
312 | /* | |
313 | * If _PRW says we can wake up the system from the target sleep state, | |
314 | * the D-state returned by _SxD is sufficient for that (we assume a | |
315 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
316 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
317 | * can wake the system. _S0W may be valid, too. | |
318 | */ | |
319 | if (acpi_target_sleep_state == ACPI_STATE_S0 || | |
320 | (wake && adev->wakeup.state.enabled && | |
321 | adev->wakeup.sleep_state <= acpi_target_sleep_state)) { | |
322 | acpi_method[3] = 'W'; | |
323 | acpi_evaluate_integer(handle, acpi_method, NULL, &d_max); | |
324 | /* Sanity check */ | |
325 | if (d_max < d_min) | |
326 | d_min = d_max; | |
327 | } | |
328 | ||
329 | if (d_min_p) | |
330 | *d_min_p = d_min; | |
331 | return d_max; | |
332 | } | |
333 | ||
1da177e4 LT |
334 | /* |
335 | * Toshiba fails to preserve interrupts over S1, reinitialization | |
336 | * of 8259 is needed after S1 resume. | |
337 | */ | |
338 | static int __init init_ints_after_s1(struct dmi_system_id *d) | |
339 | { | |
340 | printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident); | |
341 | init_8259A_after_S1 = 1; | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static struct dmi_system_id __initdata acpisleep_dmi_table[] = { | |
346 | { | |
e2a5b420 AS |
347 | .callback = init_ints_after_s1, |
348 | .ident = "Toshiba Satellite 4030cdt", | |
349 | .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),}, | |
350 | }, | |
351 | {}, | |
1da177e4 LT |
352 | }; |
353 | ||
aafbcd16 | 354 | int __init acpi_sleep_init(void) |
1da177e4 | 355 | { |
e2a5b420 | 356 | int i = 0; |
1da177e4 LT |
357 | |
358 | dmi_check_system(acpisleep_dmi_table); | |
359 | ||
360 | if (acpi_disabled) | |
361 | return 0; | |
362 | ||
363 | printk(KERN_INFO PREFIX "(supports"); | |
e2a5b420 | 364 | for (i = 0; i < ACPI_S_STATE_COUNT; i++) { |
1da177e4 LT |
365 | acpi_status status; |
366 | u8 type_a, type_b; | |
367 | status = acpi_get_sleep_type_data(i, &type_a, &type_b); | |
368 | if (ACPI_SUCCESS(status)) { | |
369 | sleep_states[i] = 1; | |
370 | printk(" S%d", i); | |
371 | } | |
1da177e4 LT |
372 | } |
373 | printk(")\n"); | |
374 | ||
375 | pm_set_ops(&acpi_pm_ops); | |
a3d25c27 | 376 | |
b0cb1a19 | 377 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
378 | if (sleep_states[ACPI_STATE_S4]) |
379 | hibernation_set_ops(&acpi_hibernation_ops); | |
380 | #else | |
381 | sleep_states[ACPI_STATE_S4] = 0; | |
382 | #endif | |
383 | ||
1da177e4 LT |
384 | return 0; |
385 | } |