1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Architecture-specific ACPI-based support for suspend-to-idle.
4 *
5 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
6 * Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
7 * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
8 *
9 * On platforms supporting the Low Power S0 Idle interface there is an ACPI
10 * device object with the PNP0D80 compatible device ID (System Power Management
11 * Controller) and a specific _DSM method under it. That method, if present,
12 * can be used to indicate to the platform that the OS is transitioning into a
13 * low-power state in which certain types of activity are not desirable or that
14 * it is leaving such a state, which allows the platform to adjust its operation
15 * mode accordingly.
16 */
17
18 #include <linux/acpi.h>
19 #include <linux/device.h>
20 #include <linux/dmi.h>
21 #include <linux/suspend.h>
22
23 #include "../sleep.h"
24
25 #ifdef CONFIG_SUSPEND
26
27 static bool sleep_no_lps0 __read_mostly;
28 module_param(sleep_no_lps0, bool, 0644);
29 MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface");
30
31 static bool check_lps0_constraints __read_mostly;
32 module_param(check_lps0_constraints, bool, 0644);
33 MODULE_PARM_DESC(check_lps0_constraints, "Check LPS0 device constraints");
34
35 static const struct acpi_device_id lps0_device_ids[] = {
36 {"PNP0D80", },
37 {"", },
38 };
39
40 /* Microsoft platform agnostic UUID */
41 #define ACPI_LPS0_DSM_UUID_MICROSOFT "11e00d56-ce64-47ce-837b-1f898f9aa461"
42
43 #define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
44
45 #define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1
46 #define ACPI_LPS0_SCREEN_OFF 3
47 #define ACPI_LPS0_SCREEN_ON 4
48 #define ACPI_LPS0_ENTRY 5
49 #define ACPI_LPS0_EXIT 6
50 #define ACPI_LPS0_MS_ENTRY 7
51 #define ACPI_LPS0_MS_EXIT 8
52 #define ACPI_MS_TURN_ON_DISPLAY 9
53
54 /* AMD */
55 #define ACPI_LPS0_DSM_UUID_AMD "e3f32452-febc-43ce-9039-932122d37721"
56 #define ACPI_LPS0_ENTRY_AMD 2
57 #define ACPI_LPS0_EXIT_AMD 3
58 #define ACPI_LPS0_SCREEN_OFF_AMD 4
59 #define ACPI_LPS0_SCREEN_ON_AMD 5
60
61 static acpi_handle lps0_device_handle;
62 static guid_t lps0_dsm_guid;
63 static int lps0_dsm_func_mask;
64
65 static guid_t lps0_dsm_guid_microsoft;
66 static int lps0_dsm_func_mask_microsoft;
67 static int lps0_dsm_state;
68
69 /* Device constraint entry structure */
70 struct lpi_device_info {
71 char *name;
72 int enabled;
73 union acpi_object *package;
74 };
75
76 /* Constraint package structure */
77 struct lpi_device_constraint {
78 int uid;
79 int min_dstate;
80 int function_states;
81 };
82
83 struct lpi_constraints {
84 acpi_handle handle;
85 int min_dstate;
86 };
87
88 /* AMD Constraint package structure */
89 struct lpi_device_constraint_amd {
90 char *name;
91 int enabled;
92 int function_states;
93 int min_dstate;
94 };
95
96 static LIST_HEAD(lps0_s2idle_devops_head);
97
98 static struct lpi_constraints *lpi_constraints_table;
99 static int lpi_constraints_table_size;
100 static int rev_id;
101
102 #define for_each_lpi_constraint(entry) \
103 for (int i = 0; \
104 entry = &lpi_constraints_table[i], i < lpi_constraints_table_size; \
105 i++)
106
lpi_device_get_constraints_amd(void)107 static void lpi_device_get_constraints_amd(void)
108 {
109 union acpi_object *out_obj;
110 int i, j, k;
111
112 out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
113 rev_id, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
114 NULL, ACPI_TYPE_PACKAGE);
115
116 acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
117 out_obj ? "successful" : "failed");
118
119 if (!out_obj)
120 return;
121
122 for (i = 0; i < out_obj->package.count; i++) {
123 union acpi_object *package = &out_obj->package.elements[i];
124
125 if (package->type == ACPI_TYPE_PACKAGE) {
126 if (lpi_constraints_table) {
127 acpi_handle_err(lps0_device_handle,
128 "Duplicate constraints list\n");
129 goto free_acpi_buffer;
130 }
131
132 lpi_constraints_table = kzalloc_objs(*lpi_constraints_table,
133 package->package.count);
134
135 if (!lpi_constraints_table)
136 goto free_acpi_buffer;
137
138 acpi_handle_debug(lps0_device_handle,
139 "LPI: constraints list begin:\n");
140
141 for (j = 0; j < package->package.count; j++) {
142 union acpi_object *info_obj = &package->package.elements[j];
143 struct lpi_device_constraint_amd dev_info = {};
144 struct lpi_constraints *list;
145 acpi_status status;
146
147 list = &lpi_constraints_table[lpi_constraints_table_size];
148
149 for (k = 0; k < info_obj->package.count; k++) {
150 union acpi_object *obj = &info_obj->package.elements[k];
151
152 switch (k) {
153 case 0:
154 dev_info.enabled = obj->integer.value;
155 break;
156 case 1:
157 dev_info.name = obj->string.pointer;
158 break;
159 case 2:
160 dev_info.function_states = obj->integer.value;
161 break;
162 case 3:
163 dev_info.min_dstate = obj->integer.value;
164 break;
165 }
166 }
167
168 acpi_handle_debug(lps0_device_handle,
169 "Name:%s, Enabled: %d, States: %d, MinDstate: %d\n",
170 dev_info.name,
171 dev_info.enabled,
172 dev_info.function_states,
173 dev_info.min_dstate);
174
175 if (!dev_info.enabled || !dev_info.name ||
176 !dev_info.min_dstate)
177 continue;
178
179 status = acpi_get_handle(NULL, dev_info.name, &list->handle);
180 if (ACPI_FAILURE(status))
181 continue;
182
183 list->min_dstate = dev_info.min_dstate;
184
185 lpi_constraints_table_size++;
186 }
187 }
188 }
189
190 acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
191
192 free_acpi_buffer:
193 ACPI_FREE(out_obj);
194 }
195
lpi_device_get_constraints(void)196 static void lpi_device_get_constraints(void)
197 {
198 union acpi_object *out_obj;
199 int i;
200
201 out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
202 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
203 NULL, ACPI_TYPE_PACKAGE);
204
205 acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
206 out_obj ? "successful" : "failed");
207
208 if (!out_obj)
209 return;
210
211 lpi_constraints_table = kzalloc_objs(*lpi_constraints_table,
212 out_obj->package.count);
213 if (!lpi_constraints_table)
214 goto free_acpi_buffer;
215
216 acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
217
218 for (i = 0; i < out_obj->package.count; i++) {
219 struct lpi_constraints *constraint;
220 acpi_status status;
221 union acpi_object *package = &out_obj->package.elements[i];
222 struct lpi_device_info info = { };
223 int package_count = 0, j;
224
225 if (!package)
226 continue;
227
228 for (j = 0; j < package->package.count; j++) {
229 union acpi_object *element =
230 &(package->package.elements[j]);
231
232 switch (element->type) {
233 case ACPI_TYPE_INTEGER:
234 info.enabled = element->integer.value;
235 break;
236 case ACPI_TYPE_STRING:
237 info.name = element->string.pointer;
238 break;
239 case ACPI_TYPE_PACKAGE:
240 package_count = element->package.count;
241 info.package = element->package.elements;
242 break;
243 }
244 }
245
246 if (!info.enabled || !info.package || !info.name)
247 continue;
248
249 constraint = &lpi_constraints_table[lpi_constraints_table_size];
250
251 status = acpi_get_handle(NULL, info.name, &constraint->handle);
252 if (ACPI_FAILURE(status))
253 continue;
254
255 acpi_handle_debug(lps0_device_handle,
256 "index:%d Name:%s\n", i, info.name);
257
258 constraint->min_dstate = -1;
259
260 for (j = 0; j < package_count; j++) {
261 union acpi_object *info_obj = &info.package[j];
262 union acpi_object *cnstr_pkg;
263 union acpi_object *obj;
264 struct lpi_device_constraint dev_info;
265
266 switch (info_obj->type) {
267 case ACPI_TYPE_INTEGER:
268 /* version */
269 break;
270 case ACPI_TYPE_PACKAGE:
271 if (info_obj->package.count < 2)
272 break;
273
274 cnstr_pkg = info_obj->package.elements;
275 obj = &cnstr_pkg[0];
276 dev_info.uid = obj->integer.value;
277 obj = &cnstr_pkg[1];
278 dev_info.min_dstate = obj->integer.value;
279
280 acpi_handle_debug(lps0_device_handle,
281 "uid:%d min_dstate:%s\n",
282 dev_info.uid,
283 acpi_power_state_string(dev_info.min_dstate));
284
285 constraint->min_dstate = dev_info.min_dstate;
286 break;
287 }
288 }
289
290 if (constraint->min_dstate < 0) {
291 acpi_handle_debug(lps0_device_handle,
292 "Incomplete constraint defined\n");
293 continue;
294 }
295
296 lpi_constraints_table_size++;
297 }
298
299 acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
300
301 free_acpi_buffer:
302 ACPI_FREE(out_obj);
303 }
304
lpi_check_constraints(void)305 static void lpi_check_constraints(void)
306 {
307 struct lpi_constraints *entry;
308
309 if (IS_ERR_OR_NULL(lpi_constraints_table))
310 return;
311
312 for_each_lpi_constraint(entry) {
313 struct acpi_device *adev = acpi_fetch_acpi_dev(entry->handle);
314
315 if (!adev)
316 continue;
317
318 acpi_handle_debug(entry->handle,
319 "LPI: required min power state:%s current power state:%s\n",
320 acpi_power_state_string(entry->min_dstate),
321 acpi_power_state_string(adev->power.state));
322
323 if (!adev->flags.power_manageable) {
324 acpi_handle_info(entry->handle, "LPI: Device not power manageable\n");
325 entry->handle = NULL;
326 continue;
327 }
328
329 if (adev->power.state < entry->min_dstate)
330 acpi_handle_info(entry->handle,
331 "LPI: Constraint not met; min power state:%s current power state:%s\n",
332 acpi_power_state_string(entry->min_dstate),
333 acpi_power_state_string(adev->power.state));
334 }
335 }
336
acpi_s2idle_vendor_amd(void)337 static bool acpi_s2idle_vendor_amd(void)
338 {
339 return boot_cpu_data.x86_vendor == X86_VENDOR_AMD;
340 }
341
acpi_sleep_dsm_state_to_str(unsigned int state)342 static const char *acpi_sleep_dsm_state_to_str(unsigned int state)
343 {
344 if (lps0_dsm_func_mask_microsoft || !acpi_s2idle_vendor_amd()) {
345 switch (state) {
346 case ACPI_LPS0_SCREEN_OFF:
347 return "screen off";
348 case ACPI_LPS0_SCREEN_ON:
349 return "screen on";
350 case ACPI_LPS0_ENTRY:
351 return "lps0 entry";
352 case ACPI_LPS0_EXIT:
353 return "lps0 exit";
354 case ACPI_LPS0_MS_ENTRY:
355 return "lps0 ms entry";
356 case ACPI_LPS0_MS_EXIT:
357 return "lps0 ms exit";
358 case ACPI_MS_TURN_ON_DISPLAY:
359 return "lps0 ms turn on display";
360 }
361 } else {
362 switch (state) {
363 case ACPI_LPS0_SCREEN_ON_AMD:
364 return "screen on";
365 case ACPI_LPS0_SCREEN_OFF_AMD:
366 return "screen off";
367 case ACPI_LPS0_ENTRY_AMD:
368 return "lps0 entry";
369 case ACPI_LPS0_EXIT_AMD:
370 return "lps0 exit";
371 }
372 }
373
374 return "unknown";
375 }
376
acpi_sleep_run_lps0_dsm(unsigned int func,unsigned int func_mask,guid_t dsm_guid)377 static void acpi_sleep_run_lps0_dsm(unsigned int func, unsigned int func_mask, guid_t dsm_guid)
378 {
379 union acpi_object *out_obj;
380
381 if (!(func_mask & (1 << func)))
382 return;
383
384 out_obj = acpi_evaluate_dsm(lps0_device_handle, &dsm_guid,
385 rev_id, func, NULL);
386 ACPI_FREE(out_obj);
387
388 lps0_dsm_state = func;
389 if (pm_debug_messages_on) {
390 acpi_handle_info(lps0_device_handle,
391 "%s transitioned to state %s\n",
392 out_obj ? "Successfully" : "Failed to",
393 acpi_sleep_dsm_state_to_str(lps0_dsm_state));
394 }
395 }
396
397
validate_dsm(acpi_handle handle,const char * uuid,int rev,guid_t * dsm_guid)398 static int validate_dsm(acpi_handle handle, const char *uuid, int rev, guid_t *dsm_guid)
399 {
400 union acpi_object *obj;
401 int ret = -EINVAL;
402
403 guid_parse(uuid, dsm_guid);
404
405 /* Check if the _DSM is present and as expected. */
406 obj = acpi_evaluate_dsm_typed(handle, dsm_guid, rev, 0, NULL, ACPI_TYPE_BUFFER);
407 if (!obj || obj->buffer.length == 0 || obj->buffer.length > sizeof(u32)) {
408 acpi_handle_debug(handle,
409 "_DSM UUID %s rev %d function 0 evaluation failed\n", uuid, rev);
410 goto out;
411 }
412
413 ret = *(int *)obj->buffer.pointer;
414 acpi_handle_debug(handle, "_DSM UUID %s rev %d function mask: 0x%x\n", uuid, rev, ret);
415
416 out:
417 ACPI_FREE(obj);
418 return ret;
419 }
420
421 struct amd_lps0_hid_device_data {
422 const bool check_off_by_one;
423 };
424
425 static const struct amd_lps0_hid_device_data amd_picasso = {
426 .check_off_by_one = true,
427 };
428
429 static const struct amd_lps0_hid_device_data amd_cezanne = {
430 .check_off_by_one = false,
431 };
432
433 static const struct acpi_device_id amd_hid_ids[] = {
434 {"AMD0004", (kernel_ulong_t)&amd_picasso, },
435 {"AMD0005", (kernel_ulong_t)&amd_picasso, },
436 {"AMDI0005", (kernel_ulong_t)&amd_picasso, },
437 {"AMDI0006", (kernel_ulong_t)&amd_cezanne, },
438 {}
439 };
440
lps0_device_attach(struct acpi_device * adev,const struct acpi_device_id * not_used)441 static int lps0_device_attach(struct acpi_device *adev,
442 const struct acpi_device_id *not_used)
443 {
444 if (lps0_device_handle)
445 return 0;
446
447 lps0_dsm_func_mask_microsoft = validate_dsm(adev->handle,
448 ACPI_LPS0_DSM_UUID_MICROSOFT, 0,
449 &lps0_dsm_guid_microsoft);
450 if (acpi_s2idle_vendor_amd()) {
451 static const struct acpi_device_id *dev_id;
452 const struct amd_lps0_hid_device_data *data;
453
454 for (dev_id = &amd_hid_ids[0]; dev_id->id[0]; dev_id++)
455 if (acpi_dev_hid_uid_match(adev, dev_id->id, NULL))
456 break;
457 if (dev_id->id[0])
458 data = (const struct amd_lps0_hid_device_data *) dev_id->driver_data;
459 else
460 data = &amd_cezanne;
461 lps0_dsm_func_mask = validate_dsm(adev->handle,
462 ACPI_LPS0_DSM_UUID_AMD, rev_id, &lps0_dsm_guid);
463 if (lps0_dsm_func_mask > 0x3 && data->check_off_by_one) {
464 lps0_dsm_func_mask = (lps0_dsm_func_mask << 1) | 0x1;
465 acpi_handle_debug(adev->handle, "_DSM UUID %s: Adjusted function mask: 0x%x\n",
466 ACPI_LPS0_DSM_UUID_AMD, lps0_dsm_func_mask);
467 }
468 } else {
469 rev_id = 1;
470 lps0_dsm_func_mask = validate_dsm(adev->handle,
471 ACPI_LPS0_DSM_UUID, rev_id, &lps0_dsm_guid);
472 if (lps0_dsm_func_mask > 0 && lps0_dsm_func_mask_microsoft > 0) {
473 unsigned int func_mask;
474
475 /*
476 * Log a message if the _DSM function sets for two
477 * different UUIDs overlap.
478 */
479 func_mask = lps0_dsm_func_mask & lps0_dsm_func_mask_microsoft;
480 if (func_mask)
481 acpi_handle_info(adev->handle,
482 "Duplicate LPS0 _DSM functions (mask: 0x%x)\n",
483 func_mask);
484 }
485 }
486
487 if (lps0_dsm_func_mask < 0 && lps0_dsm_func_mask_microsoft < 0)
488 return 0; //function evaluation failed
489
490 lps0_device_handle = adev->handle;
491
492 /*
493 * Use suspend-to-idle by default if ACPI_FADT_LOW_POWER_S0 is set in
494 * the FADT and the default suspend mode was not set from the command
495 * line.
496 */
497 if ((acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) &&
498 mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3) {
499 mem_sleep_current = PM_SUSPEND_TO_IDLE;
500 pr_info("Low-power S0 idle used by default for system suspend\n");
501 }
502
503 /*
504 * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
505 * EC GPE to be enabled while suspended for certain wakeup devices to
506 * work, so mark it as wakeup-capable.
507 */
508 acpi_ec_mark_gpe_for_wake();
509
510 return 0;
511 }
512
513 static struct acpi_scan_handler lps0_handler = {
514 .ids = lps0_device_ids,
515 .attach = lps0_device_attach,
516 };
517
acpi_s2idle_begin_lps0(void)518 static int acpi_s2idle_begin_lps0(void)
519 {
520 if (lps0_device_handle && !sleep_no_lps0 && check_lps0_constraints &&
521 !lpi_constraints_table) {
522 if (acpi_s2idle_vendor_amd())
523 lpi_device_get_constraints_amd();
524 else
525 lpi_device_get_constraints();
526
527 /*
528 * Try to retrieve the constraints only once because failures
529 * to do so usually are sticky.
530 */
531 if (!lpi_constraints_table)
532 lpi_constraints_table = ERR_PTR(-ENODATA);
533 }
534
535 return acpi_s2idle_begin();
536 }
537
acpi_s2idle_prepare_late_lps0(void)538 static int acpi_s2idle_prepare_late_lps0(void)
539 {
540 struct acpi_s2idle_dev_ops *handler;
541
542 if (!lps0_device_handle || sleep_no_lps0)
543 return 0;
544
545 if (check_lps0_constraints)
546 lpi_check_constraints();
547
548 /* Screen off */
549 if (lps0_dsm_func_mask > 0)
550 acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
551 ACPI_LPS0_SCREEN_OFF_AMD :
552 ACPI_LPS0_SCREEN_OFF,
553 lps0_dsm_func_mask, lps0_dsm_guid);
554
555 if (lps0_dsm_func_mask_microsoft > 0)
556 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF,
557 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
558
559 /* LPS0 entry */
560 if (lps0_dsm_func_mask > 0 && acpi_s2idle_vendor_amd())
561 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY_AMD,
562 lps0_dsm_func_mask, lps0_dsm_guid);
563
564 if (lps0_dsm_func_mask_microsoft > 0) {
565 /* Modern Standby entry */
566 acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_ENTRY,
567 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
568 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY,
569 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
570 }
571
572 if (lps0_dsm_func_mask > 0 && !acpi_s2idle_vendor_amd())
573 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY,
574 lps0_dsm_func_mask, lps0_dsm_guid);
575
576 list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) {
577 if (handler->prepare)
578 handler->prepare();
579 }
580
581 return 0;
582 }
583
acpi_s2idle_check_lps0(void)584 static void acpi_s2idle_check_lps0(void)
585 {
586 struct acpi_s2idle_dev_ops *handler;
587
588 if (!lps0_device_handle || sleep_no_lps0)
589 return;
590
591 list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) {
592 if (handler->check)
593 handler->check();
594 }
595 }
596
acpi_s2idle_restore_early_lps0(void)597 static void acpi_s2idle_restore_early_lps0(void)
598 {
599 struct acpi_s2idle_dev_ops *handler;
600
601 if (!lps0_device_handle || sleep_no_lps0)
602 return;
603
604 list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node)
605 if (handler->restore)
606 handler->restore();
607
608 /* LPS0 exit */
609 if (lps0_dsm_func_mask > 0)
610 acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
611 ACPI_LPS0_EXIT_AMD :
612 ACPI_LPS0_EXIT,
613 lps0_dsm_func_mask, lps0_dsm_guid);
614
615 if (lps0_dsm_func_mask_microsoft > 0) {
616 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT,
617 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
618 /* Intent to turn on display */
619 acpi_sleep_run_lps0_dsm(ACPI_MS_TURN_ON_DISPLAY,
620 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
621 /* Modern Standby exit */
622 acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_EXIT,
623 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
624 }
625
626 /* Screen on */
627 if (lps0_dsm_func_mask_microsoft > 0)
628 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON,
629 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
630 if (lps0_dsm_func_mask > 0)
631 acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
632 ACPI_LPS0_SCREEN_ON_AMD :
633 ACPI_LPS0_SCREEN_ON,
634 lps0_dsm_func_mask, lps0_dsm_guid);
635 }
636
637 static const struct platform_s2idle_ops acpi_s2idle_ops_lps0 = {
638 .begin = acpi_s2idle_begin_lps0,
639 .prepare = acpi_s2idle_prepare,
640 .prepare_late = acpi_s2idle_prepare_late_lps0,
641 .check = acpi_s2idle_check_lps0,
642 .wake = acpi_s2idle_wake,
643 .restore_early = acpi_s2idle_restore_early_lps0,
644 .restore = acpi_s2idle_restore,
645 .end = acpi_s2idle_end,
646 };
647
acpi_s2idle_setup(void)648 void __init acpi_s2idle_setup(void)
649 {
650 acpi_scan_add_handler(&lps0_handler);
651 s2idle_set_ops(&acpi_s2idle_ops_lps0);
652 }
653
acpi_register_lps0_dev(struct acpi_s2idle_dev_ops * arg)654 int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg)
655 {
656 unsigned int sleep_flags;
657
658 if (!lps0_device_handle || sleep_no_lps0)
659 return -ENODEV;
660
661 sleep_flags = lock_system_sleep();
662 list_add(&arg->list_node, &lps0_s2idle_devops_head);
663 unlock_system_sleep(sleep_flags);
664
665 return 0;
666 }
667 EXPORT_SYMBOL_GPL(acpi_register_lps0_dev);
668
acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops * arg)669 void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg)
670 {
671 unsigned int sleep_flags;
672
673 if (!lps0_device_handle || sleep_no_lps0)
674 return;
675
676 sleep_flags = lock_system_sleep();
677 list_del(&arg->list_node);
678 unlock_system_sleep(sleep_flags);
679 }
680 EXPORT_SYMBOL_GPL(acpi_unregister_lps0_dev);
681
682 #endif /* CONFIG_SUSPEND */
683