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
53 /* AMD */
54 #define ACPI_LPS0_DSM_UUID_AMD "e3f32452-febc-43ce-9039-932122d37721"
55 #define ACPI_LPS0_ENTRY_AMD 2
56 #define ACPI_LPS0_EXIT_AMD 3
57 #define ACPI_LPS0_SCREEN_OFF_AMD 4
58 #define ACPI_LPS0_SCREEN_ON_AMD 5
59
60 static acpi_handle lps0_device_handle;
61 static guid_t lps0_dsm_guid;
62 static int lps0_dsm_func_mask;
63
64 static guid_t lps0_dsm_guid_microsoft;
65 static int lps0_dsm_func_mask_microsoft;
66 static int lps0_dsm_state;
67
68 /* Device constraint entry structure */
69 struct lpi_device_info {
70 char *name;
71 int enabled;
72 union acpi_object *package;
73 };
74
75 /* Constraint package structure */
76 struct lpi_device_constraint {
77 int uid;
78 int min_dstate;
79 int function_states;
80 };
81
82 struct lpi_constraints {
83 acpi_handle handle;
84 int min_dstate;
85 };
86
87 /* AMD Constraint package structure */
88 struct lpi_device_constraint_amd {
89 char *name;
90 int enabled;
91 int function_states;
92 int min_dstate;
93 };
94
95 static LIST_HEAD(lps0_s2idle_devops_head);
96
97 static struct lpi_constraints *lpi_constraints_table;
98 static int lpi_constraints_table_size;
99 static int rev_id;
100
101 #define for_each_lpi_constraint(entry) \
102 for (int i = 0; \
103 entry = &lpi_constraints_table[i], i < lpi_constraints_table_size; \
104 i++)
105
lpi_device_get_constraints_amd(void)106 static void lpi_device_get_constraints_amd(void)
107 {
108 union acpi_object *out_obj;
109 int i, j, k;
110
111 out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
112 rev_id, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
113 NULL, ACPI_TYPE_PACKAGE);
114
115 acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
116 out_obj ? "successful" : "failed");
117
118 if (!out_obj)
119 return;
120
121 for (i = 0; i < out_obj->package.count; i++) {
122 union acpi_object *package = &out_obj->package.elements[i];
123
124 if (package->type == ACPI_TYPE_PACKAGE) {
125 if (lpi_constraints_table) {
126 acpi_handle_err(lps0_device_handle,
127 "Duplicate constraints list\n");
128 goto free_acpi_buffer;
129 }
130
131 lpi_constraints_table = kcalloc(package->package.count,
132 sizeof(*lpi_constraints_table),
133 GFP_KERNEL);
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 = kcalloc(out_obj->package.count,
212 sizeof(*lpi_constraints_table),
213 GFP_KERNEL);
214 if (!lpi_constraints_table)
215 goto free_acpi_buffer;
216
217 acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
218
219 for (i = 0; i < out_obj->package.count; i++) {
220 struct lpi_constraints *constraint;
221 acpi_status status;
222 union acpi_object *package = &out_obj->package.elements[i];
223 struct lpi_device_info info = { };
224 int package_count = 0, j;
225
226 if (!package)
227 continue;
228
229 for (j = 0; j < package->package.count; j++) {
230 union acpi_object *element =
231 &(package->package.elements[j]);
232
233 switch (element->type) {
234 case ACPI_TYPE_INTEGER:
235 info.enabled = element->integer.value;
236 break;
237 case ACPI_TYPE_STRING:
238 info.name = element->string.pointer;
239 break;
240 case ACPI_TYPE_PACKAGE:
241 package_count = element->package.count;
242 info.package = element->package.elements;
243 break;
244 }
245 }
246
247 if (!info.enabled || !info.package || !info.name)
248 continue;
249
250 constraint = &lpi_constraints_table[lpi_constraints_table_size];
251
252 status = acpi_get_handle(NULL, info.name, &constraint->handle);
253 if (ACPI_FAILURE(status))
254 continue;
255
256 acpi_handle_debug(lps0_device_handle,
257 "index:%d Name:%s\n", i, info.name);
258
259 constraint->min_dstate = -1;
260
261 for (j = 0; j < package_count; j++) {
262 union acpi_object *info_obj = &info.package[j];
263 union acpi_object *cnstr_pkg;
264 union acpi_object *obj;
265 struct lpi_device_constraint dev_info;
266
267 switch (info_obj->type) {
268 case ACPI_TYPE_INTEGER:
269 /* version */
270 break;
271 case ACPI_TYPE_PACKAGE:
272 if (info_obj->package.count < 2)
273 break;
274
275 cnstr_pkg = info_obj->package.elements;
276 obj = &cnstr_pkg[0];
277 dev_info.uid = obj->integer.value;
278 obj = &cnstr_pkg[1];
279 dev_info.min_dstate = obj->integer.value;
280
281 acpi_handle_debug(lps0_device_handle,
282 "uid:%d min_dstate:%s\n",
283 dev_info.uid,
284 acpi_power_state_string(dev_info.min_dstate));
285
286 constraint->min_dstate = dev_info.min_dstate;
287 break;
288 }
289 }
290
291 if (constraint->min_dstate < 0) {
292 acpi_handle_debug(lps0_device_handle,
293 "Incomplete constraint defined\n");
294 continue;
295 }
296
297 lpi_constraints_table_size++;
298 }
299
300 acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
301
302 free_acpi_buffer:
303 ACPI_FREE(out_obj);
304 }
305
lpi_check_constraints(void)306 static void lpi_check_constraints(void)
307 {
308 struct lpi_constraints *entry;
309
310 if (IS_ERR_OR_NULL(lpi_constraints_table))
311 return;
312
313 for_each_lpi_constraint(entry) {
314 struct acpi_device *adev = acpi_fetch_acpi_dev(entry->handle);
315
316 if (!adev)
317 continue;
318
319 acpi_handle_debug(entry->handle,
320 "LPI: required min power state:%s current power state:%s\n",
321 acpi_power_state_string(entry->min_dstate),
322 acpi_power_state_string(adev->power.state));
323
324 if (!adev->flags.power_manageable) {
325 acpi_handle_info(entry->handle, "LPI: Device not power manageable\n");
326 entry->handle = NULL;
327 continue;
328 }
329
330 if (adev->power.state < entry->min_dstate)
331 acpi_handle_info(entry->handle,
332 "LPI: Constraint not met; min power state:%s current power state:%s\n",
333 acpi_power_state_string(entry->min_dstate),
334 acpi_power_state_string(adev->power.state));
335 }
336 }
337
acpi_s2idle_vendor_amd(void)338 static bool acpi_s2idle_vendor_amd(void)
339 {
340 return boot_cpu_data.x86_vendor == X86_VENDOR_AMD;
341 }
342
acpi_sleep_dsm_state_to_str(unsigned int state)343 static const char *acpi_sleep_dsm_state_to_str(unsigned int state)
344 {
345 if (lps0_dsm_func_mask_microsoft || !acpi_s2idle_vendor_amd()) {
346 switch (state) {
347 case ACPI_LPS0_SCREEN_OFF:
348 return "screen off";
349 case ACPI_LPS0_SCREEN_ON:
350 return "screen on";
351 case ACPI_LPS0_ENTRY:
352 return "lps0 entry";
353 case ACPI_LPS0_EXIT:
354 return "lps0 exit";
355 case ACPI_LPS0_MS_ENTRY:
356 return "lps0 ms entry";
357 case ACPI_LPS0_MS_EXIT:
358 return "lps0 ms exit";
359 }
360 } else {
361 switch (state) {
362 case ACPI_LPS0_SCREEN_ON_AMD:
363 return "screen on";
364 case ACPI_LPS0_SCREEN_OFF_AMD:
365 return "screen off";
366 case ACPI_LPS0_ENTRY_AMD:
367 return "lps0 entry";
368 case ACPI_LPS0_EXIT_AMD:
369 return "lps0 exit";
370 }
371 }
372
373 return "unknown";
374 }
375
acpi_sleep_run_lps0_dsm(unsigned int func,unsigned int func_mask,guid_t dsm_guid)376 static void acpi_sleep_run_lps0_dsm(unsigned int func, unsigned int func_mask, guid_t dsm_guid)
377 {
378 union acpi_object *out_obj;
379
380 if (!(func_mask & (1 << func)))
381 return;
382
383 out_obj = acpi_evaluate_dsm(lps0_device_handle, &dsm_guid,
384 rev_id, func, NULL);
385 ACPI_FREE(out_obj);
386
387 lps0_dsm_state = func;
388 if (pm_debug_messages_on) {
389 acpi_handle_info(lps0_device_handle,
390 "%s transitioned to state %s\n",
391 out_obj ? "Successfully" : "Failed to",
392 acpi_sleep_dsm_state_to_str(lps0_dsm_state));
393 }
394 }
395
396
validate_dsm(acpi_handle handle,const char * uuid,int rev,guid_t * dsm_guid)397 static int validate_dsm(acpi_handle handle, const char *uuid, int rev, guid_t *dsm_guid)
398 {
399 union acpi_object *obj;
400 int ret = -EINVAL;
401
402 guid_parse(uuid, dsm_guid);
403
404 /* Check if the _DSM is present and as expected. */
405 obj = acpi_evaluate_dsm_typed(handle, dsm_guid, rev, 0, NULL, ACPI_TYPE_BUFFER);
406 if (!obj || obj->buffer.length == 0 || obj->buffer.length > sizeof(u32)) {
407 acpi_handle_debug(handle,
408 "_DSM UUID %s rev %d function 0 evaluation failed\n", uuid, rev);
409 goto out;
410 }
411
412 ret = *(int *)obj->buffer.pointer;
413 acpi_handle_debug(handle, "_DSM UUID %s rev %d function mask: 0x%x\n", uuid, rev, ret);
414
415 out:
416 ACPI_FREE(obj);
417 return ret;
418 }
419
420 struct amd_lps0_hid_device_data {
421 const bool check_off_by_one;
422 };
423
424 static const struct amd_lps0_hid_device_data amd_picasso = {
425 .check_off_by_one = true,
426 };
427
428 static const struct amd_lps0_hid_device_data amd_cezanne = {
429 .check_off_by_one = false,
430 };
431
432 static const struct acpi_device_id amd_hid_ids[] = {
433 {"AMD0004", (kernel_ulong_t)&amd_picasso, },
434 {"AMD0005", (kernel_ulong_t)&amd_picasso, },
435 {"AMDI0005", (kernel_ulong_t)&amd_picasso, },
436 {"AMDI0006", (kernel_ulong_t)&amd_cezanne, },
437 {}
438 };
439
lps0_device_attach(struct acpi_device * adev,const struct acpi_device_id * not_used)440 static int lps0_device_attach(struct acpi_device *adev,
441 const struct acpi_device_id *not_used)
442 {
443 if (lps0_device_handle)
444 return 0;
445
446 lps0_dsm_func_mask_microsoft = validate_dsm(adev->handle,
447 ACPI_LPS0_DSM_UUID_MICROSOFT, 0,
448 &lps0_dsm_guid_microsoft);
449 if (acpi_s2idle_vendor_amd()) {
450 static const struct acpi_device_id *dev_id;
451 const struct amd_lps0_hid_device_data *data;
452
453 for (dev_id = &amd_hid_ids[0]; dev_id->id[0]; dev_id++)
454 if (acpi_dev_hid_uid_match(adev, dev_id->id, NULL))
455 break;
456 if (dev_id->id[0])
457 data = (const struct amd_lps0_hid_device_data *) dev_id->driver_data;
458 else
459 data = &amd_cezanne;
460 lps0_dsm_func_mask = validate_dsm(adev->handle,
461 ACPI_LPS0_DSM_UUID_AMD, rev_id, &lps0_dsm_guid);
462 if (lps0_dsm_func_mask > 0x3 && data->check_off_by_one) {
463 lps0_dsm_func_mask = (lps0_dsm_func_mask << 1) | 0x1;
464 acpi_handle_debug(adev->handle, "_DSM UUID %s: Adjusted function mask: 0x%x\n",
465 ACPI_LPS0_DSM_UUID_AMD, lps0_dsm_func_mask);
466 } else if (lps0_dsm_func_mask_microsoft > 0 && rev_id) {
467 lps0_dsm_func_mask_microsoft = -EINVAL;
468 acpi_handle_debug(adev->handle, "_DSM Using AMD method\n");
469 }
470 } else {
471 rev_id = 1;
472 lps0_dsm_func_mask = validate_dsm(adev->handle,
473 ACPI_LPS0_DSM_UUID, rev_id, &lps0_dsm_guid);
474 if (lps0_dsm_func_mask > 0 && lps0_dsm_func_mask_microsoft > 0) {
475 unsigned int func_mask;
476
477 /*
478 * Log a message if the _DSM function sets for two
479 * different UUIDs overlap.
480 */
481 func_mask = lps0_dsm_func_mask & lps0_dsm_func_mask_microsoft;
482 if (func_mask)
483 acpi_handle_info(adev->handle,
484 "Duplicate LPS0 _DSM functions (mask: 0x%x)\n",
485 func_mask);
486 }
487 }
488
489 if (lps0_dsm_func_mask < 0 && lps0_dsm_func_mask_microsoft < 0)
490 return 0; //function evaluation failed
491
492 lps0_device_handle = adev->handle;
493
494 /*
495 * Use suspend-to-idle by default if ACPI_FADT_LOW_POWER_S0 is set in
496 * the FADT and the default suspend mode was not set from the command
497 * line.
498 */
499 if ((acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) &&
500 mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3) {
501 mem_sleep_current = PM_SUSPEND_TO_IDLE;
502 pr_info("Low-power S0 idle used by default for system suspend\n");
503 }
504
505 /*
506 * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
507 * EC GPE to be enabled while suspended for certain wakeup devices to
508 * work, so mark it as wakeup-capable.
509 */
510 acpi_ec_mark_gpe_for_wake();
511
512 return 0;
513 }
514
515 static struct acpi_scan_handler lps0_handler = {
516 .ids = lps0_device_ids,
517 .attach = lps0_device_attach,
518 };
519
acpi_s2idle_begin_lps0(void)520 static int acpi_s2idle_begin_lps0(void)
521 {
522 if (lps0_device_handle && !sleep_no_lps0 && check_lps0_constraints &&
523 !lpi_constraints_table) {
524 if (acpi_s2idle_vendor_amd())
525 lpi_device_get_constraints_amd();
526 else
527 lpi_device_get_constraints();
528
529 /*
530 * Try to retrieve the constraints only once because failures
531 * to do so usually are sticky.
532 */
533 if (!lpi_constraints_table)
534 lpi_constraints_table = ERR_PTR(-ENODATA);
535 }
536
537 return acpi_s2idle_begin();
538 }
539
acpi_s2idle_prepare_late_lps0(void)540 static int acpi_s2idle_prepare_late_lps0(void)
541 {
542 struct acpi_s2idle_dev_ops *handler;
543
544 if (!lps0_device_handle || sleep_no_lps0)
545 return 0;
546
547 if (check_lps0_constraints)
548 lpi_check_constraints();
549
550 /* Screen off */
551 if (lps0_dsm_func_mask > 0)
552 acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
553 ACPI_LPS0_SCREEN_OFF_AMD :
554 ACPI_LPS0_SCREEN_OFF,
555 lps0_dsm_func_mask, lps0_dsm_guid);
556
557 if (lps0_dsm_func_mask_microsoft > 0)
558 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF,
559 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
560
561 /* LPS0 entry */
562 if (lps0_dsm_func_mask > 0 && acpi_s2idle_vendor_amd())
563 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY_AMD,
564 lps0_dsm_func_mask, lps0_dsm_guid);
565
566 if (lps0_dsm_func_mask_microsoft > 0) {
567 /* Modern Standby entry */
568 acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_ENTRY,
569 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
570 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY,
571 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
572 }
573
574 if (lps0_dsm_func_mask > 0 && !acpi_s2idle_vendor_amd())
575 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY,
576 lps0_dsm_func_mask, lps0_dsm_guid);
577
578 list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) {
579 if (handler->prepare)
580 handler->prepare();
581 }
582
583 return 0;
584 }
585
acpi_s2idle_check_lps0(void)586 static void acpi_s2idle_check_lps0(void)
587 {
588 struct acpi_s2idle_dev_ops *handler;
589
590 if (!lps0_device_handle || sleep_no_lps0)
591 return;
592
593 list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) {
594 if (handler->check)
595 handler->check();
596 }
597 }
598
acpi_s2idle_restore_early_lps0(void)599 static void acpi_s2idle_restore_early_lps0(void)
600 {
601 struct acpi_s2idle_dev_ops *handler;
602
603 if (!lps0_device_handle || sleep_no_lps0)
604 return;
605
606 list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node)
607 if (handler->restore)
608 handler->restore();
609
610 /* LPS0 exit */
611 if (lps0_dsm_func_mask > 0)
612 acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
613 ACPI_LPS0_EXIT_AMD :
614 ACPI_LPS0_EXIT,
615 lps0_dsm_func_mask, lps0_dsm_guid);
616
617 if (lps0_dsm_func_mask_microsoft > 0) {
618 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT,
619 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
620 /* Modern Standby exit */
621 acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_EXIT,
622 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
623 }
624
625 /* Screen on */
626 if (lps0_dsm_func_mask_microsoft > 0)
627 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON,
628 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
629 if (lps0_dsm_func_mask > 0)
630 acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
631 ACPI_LPS0_SCREEN_ON_AMD :
632 ACPI_LPS0_SCREEN_ON,
633 lps0_dsm_func_mask, lps0_dsm_guid);
634 }
635
636 static const struct platform_s2idle_ops acpi_s2idle_ops_lps0 = {
637 .begin = acpi_s2idle_begin_lps0,
638 .prepare = acpi_s2idle_prepare,
639 .prepare_late = acpi_s2idle_prepare_late_lps0,
640 .check = acpi_s2idle_check_lps0,
641 .wake = acpi_s2idle_wake,
642 .restore_early = acpi_s2idle_restore_early_lps0,
643 .restore = acpi_s2idle_restore,
644 .end = acpi_s2idle_end,
645 };
646
acpi_s2idle_setup(void)647 void __init acpi_s2idle_setup(void)
648 {
649 acpi_scan_add_handler(&lps0_handler);
650 s2idle_set_ops(&acpi_s2idle_ops_lps0);
651 }
652
acpi_register_lps0_dev(struct acpi_s2idle_dev_ops * arg)653 int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg)
654 {
655 unsigned int sleep_flags;
656
657 if (!lps0_device_handle || sleep_no_lps0)
658 return -ENODEV;
659
660 sleep_flags = lock_system_sleep();
661 list_add(&arg->list_node, &lps0_s2idle_devops_head);
662 unlock_system_sleep(sleep_flags);
663
664 return 0;
665 }
666 EXPORT_SYMBOL_GPL(acpi_register_lps0_dev);
667
acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops * arg)668 void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg)
669 {
670 unsigned int sleep_flags;
671
672 if (!lps0_device_handle || sleep_no_lps0)
673 return;
674
675 sleep_flags = lock_system_sleep();
676 list_del(&arg->list_node);
677 unlock_system_sleep(sleep_flags);
678 }
679 EXPORT_SYMBOL_GPL(acpi_unregister_lps0_dev);
680
681 #endif /* CONFIG_SUSPEND */
682