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 prefer_microsoft_dsm_guid __read_mostly;
32 module_param(prefer_microsoft_dsm_guid, bool, 0644);
33 MODULE_PARM_DESC(prefer_microsoft_dsm_guid, "Prefer using Microsoft GUID in LPS0 device _DSM evaluation");
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
67 /* Device constraint entry structure */
68 struct lpi_device_info {
69 char *name;
70 int enabled;
71 union acpi_object *package;
72 };
73
74 /* Constraint package structure */
75 struct lpi_device_constraint {
76 int uid;
77 int min_dstate;
78 int function_states;
79 };
80
81 struct lpi_constraints {
82 acpi_handle handle;
83 int min_dstate;
84 };
85
86 /* AMD Constraint package structure */
87 struct lpi_device_constraint_amd {
88 char *name;
89 int enabled;
90 int function_states;
91 int min_dstate;
92 };
93
94 static LIST_HEAD(lps0_s2idle_devops_head);
95
96 static struct lpi_constraints *lpi_constraints_table;
97 static int lpi_constraints_table_size;
98 static int rev_id;
99
lpi_device_get_constraints_amd(void)100 static void lpi_device_get_constraints_amd(void)
101 {
102 union acpi_object *out_obj;
103 int i, j, k;
104
105 out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
106 rev_id, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
107 NULL, ACPI_TYPE_PACKAGE);
108
109 acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
110 out_obj ? "successful" : "failed");
111
112 if (!out_obj)
113 return;
114
115 for (i = 0; i < out_obj->package.count; i++) {
116 union acpi_object *package = &out_obj->package.elements[i];
117
118 if (package->type == ACPI_TYPE_PACKAGE) {
119 lpi_constraints_table = kcalloc(package->package.count,
120 sizeof(*lpi_constraints_table),
121 GFP_KERNEL);
122
123 if (!lpi_constraints_table)
124 goto free_acpi_buffer;
125
126 acpi_handle_debug(lps0_device_handle,
127 "LPI: constraints list begin:\n");
128
129 for (j = 0; j < package->package.count; ++j) {
130 union acpi_object *info_obj = &package->package.elements[j];
131 struct lpi_device_constraint_amd dev_info = {};
132 struct lpi_constraints *list;
133 acpi_status status;
134
135 for (k = 0; k < info_obj->package.count; ++k) {
136 union acpi_object *obj = &info_obj->package.elements[k];
137
138 list = &lpi_constraints_table[lpi_constraints_table_size];
139 list->min_dstate = -1;
140
141 switch (k) {
142 case 0:
143 dev_info.enabled = obj->integer.value;
144 break;
145 case 1:
146 dev_info.name = obj->string.pointer;
147 break;
148 case 2:
149 dev_info.function_states = obj->integer.value;
150 break;
151 case 3:
152 dev_info.min_dstate = obj->integer.value;
153 break;
154 }
155
156 if (!dev_info.enabled || !dev_info.name ||
157 !dev_info.min_dstate)
158 continue;
159
160 status = acpi_get_handle(NULL, dev_info.name,
161 &list->handle);
162 if (ACPI_FAILURE(status))
163 continue;
164
165 acpi_handle_debug(lps0_device_handle,
166 "Name:%s\n", dev_info.name);
167
168 list->min_dstate = dev_info.min_dstate;
169
170 if (list->min_dstate < 0) {
171 acpi_handle_debug(lps0_device_handle,
172 "Incomplete constraint defined\n");
173 continue;
174 }
175 }
176 lpi_constraints_table_size++;
177 }
178 }
179 }
180
181 acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
182
183 free_acpi_buffer:
184 ACPI_FREE(out_obj);
185 }
186
lpi_device_get_constraints(void)187 static void lpi_device_get_constraints(void)
188 {
189 union acpi_object *out_obj;
190 int i;
191
192 out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
193 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
194 NULL, ACPI_TYPE_PACKAGE);
195
196 acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
197 out_obj ? "successful" : "failed");
198
199 if (!out_obj)
200 return;
201
202 lpi_constraints_table = kcalloc(out_obj->package.count,
203 sizeof(*lpi_constraints_table),
204 GFP_KERNEL);
205 if (!lpi_constraints_table)
206 goto free_acpi_buffer;
207
208 acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
209
210 for (i = 0; i < out_obj->package.count; i++) {
211 struct lpi_constraints *constraint;
212 acpi_status status;
213 union acpi_object *package = &out_obj->package.elements[i];
214 struct lpi_device_info info = { };
215 int package_count = 0, j;
216
217 if (!package)
218 continue;
219
220 for (j = 0; j < package->package.count; ++j) {
221 union acpi_object *element =
222 &(package->package.elements[j]);
223
224 switch (element->type) {
225 case ACPI_TYPE_INTEGER:
226 info.enabled = element->integer.value;
227 break;
228 case ACPI_TYPE_STRING:
229 info.name = element->string.pointer;
230 break;
231 case ACPI_TYPE_PACKAGE:
232 package_count = element->package.count;
233 info.package = element->package.elements;
234 break;
235 }
236 }
237
238 if (!info.enabled || !info.package || !info.name)
239 continue;
240
241 constraint = &lpi_constraints_table[lpi_constraints_table_size];
242
243 status = acpi_get_handle(NULL, info.name, &constraint->handle);
244 if (ACPI_FAILURE(status))
245 continue;
246
247 acpi_handle_debug(lps0_device_handle,
248 "index:%d Name:%s\n", i, info.name);
249
250 constraint->min_dstate = -1;
251
252 for (j = 0; j < package_count; ++j) {
253 union acpi_object *info_obj = &info.package[j];
254 union acpi_object *cnstr_pkg;
255 union acpi_object *obj;
256 struct lpi_device_constraint dev_info;
257
258 switch (info_obj->type) {
259 case ACPI_TYPE_INTEGER:
260 /* version */
261 break;
262 case ACPI_TYPE_PACKAGE:
263 if (info_obj->package.count < 2)
264 break;
265
266 cnstr_pkg = info_obj->package.elements;
267 obj = &cnstr_pkg[0];
268 dev_info.uid = obj->integer.value;
269 obj = &cnstr_pkg[1];
270 dev_info.min_dstate = obj->integer.value;
271
272 acpi_handle_debug(lps0_device_handle,
273 "uid:%d min_dstate:%s\n",
274 dev_info.uid,
275 acpi_power_state_string(dev_info.min_dstate));
276
277 constraint->min_dstate = dev_info.min_dstate;
278 break;
279 }
280 }
281
282 if (constraint->min_dstate < 0) {
283 acpi_handle_debug(lps0_device_handle,
284 "Incomplete constraint defined\n");
285 continue;
286 }
287
288 lpi_constraints_table_size++;
289 }
290
291 acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
292
293 free_acpi_buffer:
294 ACPI_FREE(out_obj);
295 }
296
lpi_check_constraints(void)297 static void lpi_check_constraints(void)
298 {
299 int i;
300
301 for (i = 0; i < lpi_constraints_table_size; ++i) {
302 acpi_handle handle = lpi_constraints_table[i].handle;
303 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
304
305 if (!adev)
306 continue;
307
308 acpi_handle_debug(handle,
309 "LPI: required min power state:%s current power state:%s\n",
310 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
311 acpi_power_state_string(adev->power.state));
312
313 if (!adev->flags.power_manageable) {
314 acpi_handle_info(handle, "LPI: Device not power manageable\n");
315 lpi_constraints_table[i].handle = NULL;
316 continue;
317 }
318
319 if (adev->power.state < lpi_constraints_table[i].min_dstate)
320 acpi_handle_info(handle,
321 "LPI: Constraint not met; min power state:%s current power state:%s\n",
322 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
323 acpi_power_state_string(adev->power.state));
324 }
325 }
326
acpi_sleep_run_lps0_dsm(unsigned int func,unsigned int func_mask,guid_t dsm_guid)327 static void acpi_sleep_run_lps0_dsm(unsigned int func, unsigned int func_mask, guid_t dsm_guid)
328 {
329 union acpi_object *out_obj;
330
331 if (!(func_mask & (1 << func)))
332 return;
333
334 out_obj = acpi_evaluate_dsm(lps0_device_handle, &dsm_guid,
335 rev_id, func, NULL);
336 ACPI_FREE(out_obj);
337
338 acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
339 func, out_obj ? "successful" : "failed");
340 }
341
acpi_s2idle_vendor_amd(void)342 static bool acpi_s2idle_vendor_amd(void)
343 {
344 return boot_cpu_data.x86_vendor == X86_VENDOR_AMD;
345 }
346
validate_dsm(acpi_handle handle,const char * uuid,int rev,guid_t * dsm_guid)347 static int validate_dsm(acpi_handle handle, const char *uuid, int rev, guid_t *dsm_guid)
348 {
349 union acpi_object *obj;
350 int ret = -EINVAL;
351
352 guid_parse(uuid, dsm_guid);
353 obj = acpi_evaluate_dsm(handle, dsm_guid, rev, 0, NULL);
354
355 /* Check if the _DSM is present and as expected. */
356 if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length == 0 ||
357 obj->buffer.length > sizeof(u32)) {
358 acpi_handle_debug(handle,
359 "_DSM UUID %s rev %d function 0 evaluation failed\n", uuid, rev);
360 goto out;
361 }
362
363 ret = *(int *)obj->buffer.pointer;
364 acpi_handle_debug(handle, "_DSM UUID %s rev %d function mask: 0x%x\n", uuid, rev, ret);
365
366 out:
367 ACPI_FREE(obj);
368 return ret;
369 }
370
371 struct amd_lps0_hid_device_data {
372 const unsigned int rev_id;
373 const bool check_off_by_one;
374 const bool prefer_amd_guid;
375 };
376
377 static const struct amd_lps0_hid_device_data amd_picasso = {
378 .rev_id = 0,
379 .check_off_by_one = true,
380 .prefer_amd_guid = false,
381 };
382
383 static const struct amd_lps0_hid_device_data amd_cezanne = {
384 .rev_id = 0,
385 .check_off_by_one = false,
386 .prefer_amd_guid = false,
387 };
388
389 static const struct amd_lps0_hid_device_data amd_rembrandt = {
390 .rev_id = 2,
391 .check_off_by_one = false,
392 .prefer_amd_guid = true,
393 };
394
395 static const struct acpi_device_id amd_hid_ids[] = {
396 {"AMD0004", (kernel_ulong_t)&amd_picasso, },
397 {"AMD0005", (kernel_ulong_t)&amd_picasso, },
398 {"AMDI0005", (kernel_ulong_t)&amd_picasso, },
399 {"AMDI0006", (kernel_ulong_t)&amd_cezanne, },
400 {"AMDI0007", (kernel_ulong_t)&amd_rembrandt, },
401 {}
402 };
403
lps0_prefer_microsoft(const struct dmi_system_id * id)404 static int lps0_prefer_microsoft(const struct dmi_system_id *id)
405 {
406 pr_debug("Preferring Microsoft GUID.\n");
407 prefer_microsoft_dsm_guid = true;
408 return 0;
409 }
410
411 static const struct dmi_system_id s2idle_dmi_table[] __initconst = {
412 {
413 /*
414 * ASUS TUF Gaming A17 FA707RE
415 * https://bugzilla.kernel.org/show_bug.cgi?id=216101
416 */
417 .callback = lps0_prefer_microsoft,
418 .matches = {
419 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
420 DMI_MATCH(DMI_PRODUCT_NAME, "ASUS TUF Gaming A17"),
421 },
422 },
423 {
424 /* ASUS ROG Zephyrus G14 (2022) */
425 .callback = lps0_prefer_microsoft,
426 .matches = {
427 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
428 DMI_MATCH(DMI_PRODUCT_NAME, "ROG Zephyrus G14 GA402"),
429 },
430 },
431 {
432 /*
433 * Lenovo Yoga Slim 7 Pro X 14ARH7
434 * https://bugzilla.kernel.org/show_bug.cgi?id=216473 : 82V2
435 * https://bugzilla.kernel.org/show_bug.cgi?id=216438 : 82TL
436 */
437 .callback = lps0_prefer_microsoft,
438 .matches = {
439 DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
440 DMI_MATCH(DMI_PRODUCT_NAME, "82"),
441 },
442 },
443 {
444 /*
445 * ASUSTeK COMPUTER INC. ROG Flow X13 GV301RE_GV301RE
446 * https://gitlab.freedesktop.org/drm/amd/-/issues/2148
447 */
448 .callback = lps0_prefer_microsoft,
449 .matches = {
450 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
451 DMI_MATCH(DMI_PRODUCT_NAME, "ROG Flow X13 GV301"),
452 },
453 },
454 {
455 /*
456 * ASUSTeK COMPUTER INC. ROG Flow X16 GV601RW_GV601RW
457 * https://gitlab.freedesktop.org/drm/amd/-/issues/2148
458 */
459 .callback = lps0_prefer_microsoft,
460 .matches = {
461 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
462 DMI_MATCH(DMI_PRODUCT_NAME, "ROG Flow X16 GV601"),
463 },
464 },
465 {}
466 };
467
lps0_device_attach(struct acpi_device * adev,const struct acpi_device_id * not_used)468 static int lps0_device_attach(struct acpi_device *adev,
469 const struct acpi_device_id *not_used)
470 {
471 if (lps0_device_handle)
472 return 0;
473
474 lps0_dsm_func_mask_microsoft = validate_dsm(adev->handle,
475 ACPI_LPS0_DSM_UUID_MICROSOFT, 0,
476 &lps0_dsm_guid_microsoft);
477 if (acpi_s2idle_vendor_amd()) {
478 static const struct acpi_device_id *dev_id;
479 const struct amd_lps0_hid_device_data *data;
480
481 for (dev_id = &amd_hid_ids[0]; dev_id->id[0]; dev_id++)
482 if (acpi_dev_hid_uid_match(adev, dev_id->id, NULL))
483 break;
484 if (dev_id->id[0])
485 data = (const struct amd_lps0_hid_device_data *) dev_id->driver_data;
486 else
487 data = &amd_rembrandt;
488 rev_id = data->rev_id;
489 lps0_dsm_func_mask = validate_dsm(adev->handle,
490 ACPI_LPS0_DSM_UUID_AMD, rev_id, &lps0_dsm_guid);
491 if (lps0_dsm_func_mask > 0x3 && data->check_off_by_one) {
492 lps0_dsm_func_mask = (lps0_dsm_func_mask << 1) | 0x1;
493 acpi_handle_debug(adev->handle, "_DSM UUID %s: Adjusted function mask: 0x%x\n",
494 ACPI_LPS0_DSM_UUID_AMD, lps0_dsm_func_mask);
495 } else if (lps0_dsm_func_mask_microsoft > 0 && data->prefer_amd_guid &&
496 !prefer_microsoft_dsm_guid) {
497 lps0_dsm_func_mask_microsoft = -EINVAL;
498 acpi_handle_debug(adev->handle, "_DSM Using AMD method\n");
499 }
500 } else {
501 rev_id = 1;
502 lps0_dsm_func_mask = validate_dsm(adev->handle,
503 ACPI_LPS0_DSM_UUID, rev_id, &lps0_dsm_guid);
504 if (!prefer_microsoft_dsm_guid)
505 lps0_dsm_func_mask_microsoft = -EINVAL;
506 }
507
508 if (lps0_dsm_func_mask < 0 && lps0_dsm_func_mask_microsoft < 0)
509 return 0; //function evaluation failed
510
511 lps0_device_handle = adev->handle;
512
513 if (acpi_s2idle_vendor_amd())
514 lpi_device_get_constraints_amd();
515 else
516 lpi_device_get_constraints();
517
518 /*
519 * Use suspend-to-idle by default if ACPI_FADT_LOW_POWER_S0 is set in
520 * the FADT and the default suspend mode was not set from the command
521 * line.
522 */
523 if ((acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) &&
524 mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3) {
525 mem_sleep_current = PM_SUSPEND_TO_IDLE;
526 pr_info("Low-power S0 idle used by default for system suspend\n");
527 }
528
529 /*
530 * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
531 * EC GPE to be enabled while suspended for certain wakeup devices to
532 * work, so mark it as wakeup-capable.
533 */
534 acpi_ec_mark_gpe_for_wake();
535
536 return 0;
537 }
538
539 static struct acpi_scan_handler lps0_handler = {
540 .ids = lps0_device_ids,
541 .attach = lps0_device_attach,
542 };
543
acpi_s2idle_prepare_late(void)544 int acpi_s2idle_prepare_late(void)
545 {
546 struct acpi_s2idle_dev_ops *handler;
547
548 if (!lps0_device_handle || sleep_no_lps0)
549 return 0;
550
551 if (pm_debug_messages_on)
552 lpi_check_constraints();
553
554 /* Screen off */
555 if (lps0_dsm_func_mask > 0)
556 acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
557 ACPI_LPS0_SCREEN_OFF_AMD :
558 ACPI_LPS0_SCREEN_OFF,
559 lps0_dsm_func_mask, lps0_dsm_guid);
560
561 if (lps0_dsm_func_mask_microsoft > 0)
562 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF,
563 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
564
565 /* LPS0 entry */
566 if (lps0_dsm_func_mask > 0)
567 acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
568 ACPI_LPS0_ENTRY_AMD :
569 ACPI_LPS0_ENTRY,
570 lps0_dsm_func_mask, lps0_dsm_guid);
571 if (lps0_dsm_func_mask_microsoft > 0) {
572 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY,
573 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
574 /* modern standby entry */
575 acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_ENTRY,
576 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
577 }
578
579 list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) {
580 if (handler->prepare)
581 handler->prepare();
582 }
583
584 return 0;
585 }
586
acpi_s2idle_check(void)587 void acpi_s2idle_check(void)
588 {
589 struct acpi_s2idle_dev_ops *handler;
590
591 if (!lps0_device_handle || sleep_no_lps0)
592 return;
593
594 list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) {
595 if (handler->check)
596 handler->check();
597 }
598 }
599
acpi_s2idle_restore_early(void)600 void acpi_s2idle_restore_early(void)
601 {
602 struct acpi_s2idle_dev_ops *handler;
603
604 if (!lps0_device_handle || sleep_no_lps0)
605 return;
606
607 list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node)
608 if (handler->restore)
609 handler->restore();
610
611 /* Modern standby exit */
612 if (lps0_dsm_func_mask_microsoft > 0)
613 acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_EXIT,
614 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
615
616 /* LPS0 exit */
617 if (lps0_dsm_func_mask > 0)
618 acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
619 ACPI_LPS0_EXIT_AMD :
620 ACPI_LPS0_EXIT,
621 lps0_dsm_func_mask, lps0_dsm_guid);
622 if (lps0_dsm_func_mask_microsoft > 0)
623 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT,
624 lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
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,
639 .prepare = acpi_s2idle_prepare,
640 .prepare_late = acpi_s2idle_prepare_late,
641 .check = acpi_s2idle_check,
642 .wake = acpi_s2idle_wake,
643 .restore_early = acpi_s2idle_restore_early,
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 dmi_check_system(s2idle_dmi_table);
651 acpi_scan_add_handler(&lps0_handler);
652 s2idle_set_ops(&acpi_s2idle_ops_lps0);
653 }
654
acpi_register_lps0_dev(struct acpi_s2idle_dev_ops * arg)655 int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg)
656 {
657 unsigned int sleep_flags;
658
659 if (!lps0_device_handle || sleep_no_lps0)
660 return -ENODEV;
661
662 sleep_flags = lock_system_sleep();
663 list_add(&arg->list_node, &lps0_s2idle_devops_head);
664 unlock_system_sleep(sleep_flags);
665
666 return 0;
667 }
668 EXPORT_SYMBOL_GPL(acpi_register_lps0_dev);
669
acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops * arg)670 void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg)
671 {
672 unsigned int sleep_flags;
673
674 if (!lps0_device_handle || sleep_no_lps0)
675 return;
676
677 sleep_flags = lock_system_sleep();
678 list_del(&arg->list_node);
679 unlock_system_sleep(sleep_flags);
680 }
681 EXPORT_SYMBOL_GPL(acpi_unregister_lps0_dev);
682
683 #endif /* CONFIG_SUSPEND */
684
