1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Intel HID event & 5 button array driver
4 *
5 * Copyright (C) 2015 Alex Hung <alex.hung@canonical.com>
6 * Copyright (C) 2015 Andrew Lutomirski <luto@kernel.org>
7 */
8
9 #include <linux/acpi.h>
10 #include <linux/dmi.h>
11 #include <linux/input.h>
12 #include <linux/input/sparse-keymap.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/suspend.h>
17 #include "../dual_accel_detect.h"
18
19 /* When NOT in tablet mode, VGBS returns with the flag 0x40 */
20 #define TABLET_MODE_FLAG BIT(6)
21
22 MODULE_LICENSE("GPL");
23 MODULE_AUTHOR("Alex Hung");
24
25 static const struct acpi_device_id intel_hid_ids[] = {
26 {"INT33D5", 0},
27 {"INTC1051", 0},
28 {"INTC1054", 0},
29 {"INTC1070", 0},
30 {"INTC1076", 0},
31 {"INTC1077", 0},
32 {"INTC1078", 0},
33 {"", 0},
34 };
35 MODULE_DEVICE_TABLE(acpi, intel_hid_ids);
36
37 /* In theory, these are HID usages. */
38 static const struct key_entry intel_hid_keymap[] = {
39 /* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */
40 /* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */
41 { KE_KEY, 3, { KEY_NUMLOCK } },
42 { KE_KEY, 4, { KEY_HOME } },
43 { KE_KEY, 5, { KEY_END } },
44 { KE_KEY, 6, { KEY_PAGEUP } },
45 { KE_KEY, 7, { KEY_PAGEDOWN } },
46 { KE_KEY, 8, { KEY_RFKILL } },
47 { KE_KEY, 9, { KEY_POWER } },
48 { KE_KEY, 11, { KEY_SLEEP } },
49 /* 13 has two different meanings in the spec -- ignore it. */
50 { KE_KEY, 14, { KEY_STOPCD } },
51 { KE_KEY, 15, { KEY_PLAYPAUSE } },
52 { KE_KEY, 16, { KEY_MUTE } },
53 { KE_KEY, 17, { KEY_VOLUMEUP } },
54 { KE_KEY, 18, { KEY_VOLUMEDOWN } },
55 { KE_KEY, 19, { KEY_BRIGHTNESSUP } },
56 { KE_KEY, 20, { KEY_BRIGHTNESSDOWN } },
57 /* 27: wake -- needs special handling */
58 { KE_END },
59 };
60
61 /* 5 button array notification value. */
62 static const struct key_entry intel_array_keymap[] = {
63 { KE_KEY, 0xC2, { KEY_LEFTMETA } }, /* Press */
64 { KE_IGNORE, 0xC3, { KEY_LEFTMETA } }, /* Release */
65 { KE_KEY, 0xC4, { KEY_VOLUMEUP } }, /* Press */
66 { KE_IGNORE, 0xC5, { KEY_VOLUMEUP } }, /* Release */
67 { KE_KEY, 0xC6, { KEY_VOLUMEDOWN } }, /* Press */
68 { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* Release */
69 { KE_KEY, 0xC8, { KEY_ROTATE_LOCK_TOGGLE } }, /* Press */
70 { KE_IGNORE, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } }, /* Release */
71 { KE_KEY, 0xCE, { KEY_POWER } }, /* Press */
72 { KE_IGNORE, 0xCF, { KEY_POWER } }, /* Release */
73 { KE_END },
74 };
75
76 static const struct dmi_system_id button_array_table[] = {
77 {
78 .ident = "Wacom MobileStudio Pro 13",
79 .matches = {
80 DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"),
81 DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 13"),
82 },
83 },
84 {
85 .ident = "Wacom MobileStudio Pro 16",
86 .matches = {
87 DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"),
88 DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 16"),
89 },
90 },
91 {
92 .ident = "HP Spectre x2 (2015)",
93 .matches = {
94 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
95 DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x2 Detachable"),
96 },
97 },
98 {
99 .ident = "Lenovo ThinkPad X1 Tablet Gen 2",
100 .matches = {
101 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
102 DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Tablet Gen 2"),
103 },
104 },
105 {
106 .ident = "Microsoft Surface Go 3",
107 .matches = {
108 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
109 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
110 },
111 },
112 { }
113 };
114
115 /*
116 * Some convertible use the intel-hid ACPI interface to report SW_TABLET_MODE,
117 * these need to be compared via a DMI based authorization list because some
118 * models have unreliable VGBS return which could cause incorrect
119 * SW_TABLET_MODE report.
120 */
121 static const struct dmi_system_id dmi_vgbs_allow_list[] = {
122 {
123 .matches = {
124 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
125 DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x360 Convertible 15-df0xxx"),
126 },
127 },
128 {
129 .matches = {
130 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
131 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go"),
132 },
133 },
134 {
135 .matches = {
136 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
137 DMI_MATCH(DMI_PRODUCT_NAME, "HP Elite Dragonfly G2 Notebook PC"),
138 },
139 },
140 { }
141 };
142
143 /*
144 * Some devices, even non convertible ones, can send incorrect SW_TABLET_MODE
145 * reports. Accept such reports only from devices in this list.
146 */
147 static const struct dmi_system_id dmi_auto_add_switch[] = {
148 {
149 .matches = {
150 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */),
151 },
152 },
153 {
154 .matches = {
155 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */),
156 },
157 },
158 {} /* Array terminator */
159 };
160
161 struct intel_hid_priv {
162 struct input_dev *input_dev;
163 struct input_dev *array;
164 struct input_dev *switches;
165 bool wakeup_mode;
166 bool auto_add_switch;
167 };
168
169 #define HID_EVENT_FILTER_UUID "eeec56b3-4442-408f-a792-4edd4d758054"
170
171 enum intel_hid_dsm_fn_codes {
172 INTEL_HID_DSM_FN_INVALID,
173 INTEL_HID_DSM_BTNL_FN,
174 INTEL_HID_DSM_HDMM_FN,
175 INTEL_HID_DSM_HDSM_FN,
176 INTEL_HID_DSM_HDEM_FN,
177 INTEL_HID_DSM_BTNS_FN,
178 INTEL_HID_DSM_BTNE_FN,
179 INTEL_HID_DSM_HEBC_V1_FN,
180 INTEL_HID_DSM_VGBS_FN,
181 INTEL_HID_DSM_HEBC_V2_FN,
182 INTEL_HID_DSM_FN_MAX
183 };
184
185 static const char *intel_hid_dsm_fn_to_method[INTEL_HID_DSM_FN_MAX] = {
186 NULL,
187 "BTNL",
188 "HDMM",
189 "HDSM",
190 "HDEM",
191 "BTNS",
192 "BTNE",
193 "HEBC",
194 "VGBS",
195 "HEBC"
196 };
197
198 static unsigned long long intel_hid_dsm_fn_mask;
199 static guid_t intel_dsm_guid;
200
intel_hid_execute_method(acpi_handle handle,enum intel_hid_dsm_fn_codes fn_index,unsigned long long arg)201 static bool intel_hid_execute_method(acpi_handle handle,
202 enum intel_hid_dsm_fn_codes fn_index,
203 unsigned long long arg)
204 {
205 union acpi_object *obj, argv4, req;
206 acpi_status status;
207 char *method_name;
208
209 if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
210 fn_index >= INTEL_HID_DSM_FN_MAX)
211 return false;
212
213 method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
214
215 if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
216 goto skip_dsm_exec;
217
218 /* All methods expects a package with one integer element */
219 req.type = ACPI_TYPE_INTEGER;
220 req.integer.value = arg;
221
222 argv4.type = ACPI_TYPE_PACKAGE;
223 argv4.package.count = 1;
224 argv4.package.elements = &req;
225
226 obj = acpi_evaluate_dsm(handle, &intel_dsm_guid, 1, fn_index, &argv4);
227 if (obj) {
228 acpi_handle_debug(handle, "Exec DSM Fn code: %d[%s] success\n",
229 fn_index, method_name);
230 ACPI_FREE(obj);
231 return true;
232 }
233
234 skip_dsm_exec:
235 status = acpi_execute_simple_method(handle, method_name, arg);
236 if (ACPI_SUCCESS(status))
237 return true;
238
239 return false;
240 }
241
intel_hid_evaluate_method(acpi_handle handle,enum intel_hid_dsm_fn_codes fn_index,unsigned long long * result)242 static bool intel_hid_evaluate_method(acpi_handle handle,
243 enum intel_hid_dsm_fn_codes fn_index,
244 unsigned long long *result)
245 {
246 union acpi_object *obj;
247 acpi_status status;
248 char *method_name;
249
250 if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
251 fn_index >= INTEL_HID_DSM_FN_MAX)
252 return false;
253
254 method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
255
256 if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
257 goto skip_dsm_eval;
258
259 obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid,
260 1, fn_index,
261 NULL, ACPI_TYPE_INTEGER);
262 if (obj) {
263 *result = obj->integer.value;
264 acpi_handle_debug(handle,
265 "Eval DSM Fn code: %d[%s] results: 0x%llx\n",
266 fn_index, method_name, *result);
267 ACPI_FREE(obj);
268 return true;
269 }
270
271 skip_dsm_eval:
272 status = acpi_evaluate_integer(handle, method_name, NULL, result);
273 if (ACPI_SUCCESS(status))
274 return true;
275
276 return false;
277 }
278
intel_hid_init_dsm(acpi_handle handle)279 static void intel_hid_init_dsm(acpi_handle handle)
280 {
281 union acpi_object *obj;
282
283 guid_parse(HID_EVENT_FILTER_UUID, &intel_dsm_guid);
284
285 obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid, 1, 0, NULL,
286 ACPI_TYPE_BUFFER);
287 if (obj) {
288 switch (obj->buffer.length) {
289 default:
290 case 2:
291 intel_hid_dsm_fn_mask = *(u16 *)obj->buffer.pointer;
292 break;
293 case 1:
294 intel_hid_dsm_fn_mask = *obj->buffer.pointer;
295 break;
296 case 0:
297 acpi_handle_warn(handle, "intel_hid_dsm_fn_mask length is zero\n");
298 intel_hid_dsm_fn_mask = 0;
299 break;
300 }
301 ACPI_FREE(obj);
302 }
303
304 acpi_handle_debug(handle, "intel_hid_dsm_fn_mask = %llx\n",
305 intel_hid_dsm_fn_mask);
306 }
307
intel_hid_set_enable(struct device * device,bool enable)308 static int intel_hid_set_enable(struct device *device, bool enable)
309 {
310 acpi_handle handle = ACPI_HANDLE(device);
311
312 /* Enable|disable features - power button is always enabled */
313 if (!intel_hid_execute_method(handle, INTEL_HID_DSM_HDSM_FN,
314 enable)) {
315 dev_warn(device, "failed to %sable hotkeys\n",
316 enable ? "en" : "dis");
317 return -EIO;
318 }
319
320 return 0;
321 }
322
intel_button_array_enable(struct device * device,bool enable)323 static void intel_button_array_enable(struct device *device, bool enable)
324 {
325 struct intel_hid_priv *priv = dev_get_drvdata(device);
326 acpi_handle handle = ACPI_HANDLE(device);
327 unsigned long long button_cap;
328 acpi_status status;
329
330 if (!priv->array)
331 return;
332
333 /* Query supported platform features */
334 status = acpi_evaluate_integer(handle, "BTNC", NULL, &button_cap);
335 if (ACPI_FAILURE(status)) {
336 dev_warn(device, "failed to get button capability\n");
337 return;
338 }
339
340 /* Enable|disable features - power button is always enabled */
341 if (!intel_hid_execute_method(handle, INTEL_HID_DSM_BTNE_FN,
342 enable ? button_cap : 1))
343 dev_warn(device, "failed to set button capability\n");
344 }
345
intel_hid_pm_prepare(struct device * device)346 static int intel_hid_pm_prepare(struct device *device)
347 {
348 if (device_may_wakeup(device)) {
349 struct intel_hid_priv *priv = dev_get_drvdata(device);
350
351 priv->wakeup_mode = true;
352 }
353 return 0;
354 }
355
intel_hid_pm_complete(struct device * device)356 static void intel_hid_pm_complete(struct device *device)
357 {
358 struct intel_hid_priv *priv = dev_get_drvdata(device);
359
360 priv->wakeup_mode = false;
361 }
362
intel_hid_pl_suspend_handler(struct device * device)363 static int intel_hid_pl_suspend_handler(struct device *device)
364 {
365 intel_button_array_enable(device, false);
366
367 if (!pm_suspend_no_platform())
368 intel_hid_set_enable(device, false);
369
370 return 0;
371 }
372
intel_hid_pl_resume_handler(struct device * device)373 static int intel_hid_pl_resume_handler(struct device *device)
374 {
375 intel_hid_pm_complete(device);
376
377 if (!pm_suspend_no_platform())
378 intel_hid_set_enable(device, true);
379
380 intel_button_array_enable(device, true);
381 return 0;
382 }
383
384 static const struct dev_pm_ops intel_hid_pl_pm_ops = {
385 .prepare = intel_hid_pm_prepare,
386 .complete = intel_hid_pm_complete,
387 .freeze = intel_hid_pl_suspend_handler,
388 .thaw = intel_hid_pl_resume_handler,
389 .restore = intel_hid_pl_resume_handler,
390 .suspend = intel_hid_pl_suspend_handler,
391 .resume = intel_hid_pl_resume_handler,
392 };
393
intel_hid_input_setup(struct platform_device * device)394 static int intel_hid_input_setup(struct platform_device *device)
395 {
396 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
397 int ret;
398
399 priv->input_dev = devm_input_allocate_device(&device->dev);
400 if (!priv->input_dev)
401 return -ENOMEM;
402
403 ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL);
404 if (ret)
405 return ret;
406
407 priv->input_dev->name = "Intel HID events";
408 priv->input_dev->id.bustype = BUS_HOST;
409
410 return input_register_device(priv->input_dev);
411 }
412
intel_button_array_input_setup(struct platform_device * device)413 static int intel_button_array_input_setup(struct platform_device *device)
414 {
415 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
416 int ret;
417
418 /* Setup input device for 5 button array */
419 priv->array = devm_input_allocate_device(&device->dev);
420 if (!priv->array)
421 return -ENOMEM;
422
423 ret = sparse_keymap_setup(priv->array, intel_array_keymap, NULL);
424 if (ret)
425 return ret;
426
427 priv->array->name = "Intel HID 5 button array";
428 priv->array->id.bustype = BUS_HOST;
429
430 return input_register_device(priv->array);
431 }
432
intel_hid_switches_setup(struct platform_device * device)433 static int intel_hid_switches_setup(struct platform_device *device)
434 {
435 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
436
437 /* Setup input device for switches */
438 priv->switches = devm_input_allocate_device(&device->dev);
439 if (!priv->switches)
440 return -ENOMEM;
441
442 __set_bit(EV_SW, priv->switches->evbit);
443 __set_bit(SW_TABLET_MODE, priv->switches->swbit);
444
445 priv->switches->name = "Intel HID switches";
446 priv->switches->id.bustype = BUS_HOST;
447 return input_register_device(priv->switches);
448 }
449
report_tablet_mode_state(struct platform_device * device)450 static void report_tablet_mode_state(struct platform_device *device)
451 {
452 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
453 acpi_handle handle = ACPI_HANDLE(&device->dev);
454 unsigned long long vgbs;
455 int m;
456
457 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_VGBS_FN, &vgbs))
458 return;
459
460 m = !(vgbs & TABLET_MODE_FLAG);
461 input_report_switch(priv->switches, SW_TABLET_MODE, m);
462 input_sync(priv->switches);
463 }
464
report_tablet_mode_event(struct input_dev * input_dev,u32 event)465 static bool report_tablet_mode_event(struct input_dev *input_dev, u32 event)
466 {
467 if (!input_dev)
468 return false;
469
470 switch (event) {
471 case 0xcc:
472 input_report_switch(input_dev, SW_TABLET_MODE, 1);
473 input_sync(input_dev);
474 return true;
475 case 0xcd:
476 input_report_switch(input_dev, SW_TABLET_MODE, 0);
477 input_sync(input_dev);
478 return true;
479 default:
480 return false;
481 }
482 }
483
notify_handler(acpi_handle handle,u32 event,void * context)484 static void notify_handler(acpi_handle handle, u32 event, void *context)
485 {
486 struct platform_device *device = context;
487 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
488 unsigned long long ev_index;
489 int err;
490
491 /*
492 * Some convertible have unreliable VGBS return which could cause incorrect
493 * SW_TABLET_MODE report, in these cases we enable support when receiving
494 * the first event instead of during driver setup.
495 */
496 if (!priv->switches && priv->auto_add_switch && (event == 0xcc || event == 0xcd)) {
497 dev_info(&device->dev, "switch event received, enable switches supports\n");
498 err = intel_hid_switches_setup(device);
499 if (err)
500 pr_err("Failed to setup Intel HID switches\n");
501 }
502
503 if (priv->wakeup_mode) {
504 /*
505 * Needed for wakeup from suspend-to-idle to work on some
506 * platforms that don't expose the 5-button array, but still
507 * send notifies with the power button event code to this
508 * device object on power button actions while suspended.
509 */
510 if (event == 0xce)
511 goto wakeup;
512
513 /*
514 * Some devices send (duplicate) tablet-mode events when moved
515 * around even though the mode has not changed; and they do this
516 * even when suspended.
517 * Update the switch state in case it changed and then return
518 * without waking up to avoid spurious wakeups.
519 */
520 if (event == 0xcc || event == 0xcd) {
521 report_tablet_mode_event(priv->switches, event);
522 return;
523 }
524
525 /* Wake up on 5-button array events only. */
526 if (event == 0xc0 || !priv->array)
527 return;
528
529 if (!sparse_keymap_entry_from_scancode(priv->array, event)) {
530 dev_info(&device->dev, "unknown event 0x%x\n", event);
531 return;
532 }
533
534 wakeup:
535 pm_wakeup_hard_event(&device->dev);
536
537 return;
538 }
539
540 /*
541 * Needed for suspend to work on some platforms that don't expose
542 * the 5-button array, but still send notifies with power button
543 * event code to this device object on power button actions.
544 *
545 * Report the power button press and release.
546 */
547 if (!priv->array) {
548 if (event == 0xce) {
549 input_report_key(priv->input_dev, KEY_POWER, 1);
550 input_sync(priv->input_dev);
551 return;
552 }
553
554 if (event == 0xcf) {
555 input_report_key(priv->input_dev, KEY_POWER, 0);
556 input_sync(priv->input_dev);
557 return;
558 }
559 }
560
561 if (report_tablet_mode_event(priv->switches, event))
562 return;
563
564 /* 0xC0 is for HID events, other values are for 5 button array */
565 if (event != 0xc0) {
566 if (!priv->array ||
567 !sparse_keymap_report_event(priv->array, event, 1, true))
568 dev_dbg(&device->dev, "unknown event 0x%x\n", event);
569 return;
570 }
571
572 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDEM_FN,
573 &ev_index)) {
574 dev_warn(&device->dev, "failed to get event index\n");
575 return;
576 }
577
578 if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true))
579 dev_dbg(&device->dev, "unknown event index 0x%llx\n",
580 ev_index);
581 }
582
button_array_present(struct platform_device * device)583 static bool button_array_present(struct platform_device *device)
584 {
585 acpi_handle handle = ACPI_HANDLE(&device->dev);
586 unsigned long long event_cap;
587
588 if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V2_FN,
589 &event_cap)) {
590 /* Check presence of 5 button array or v2 power button */
591 if (event_cap & 0x60000)
592 return true;
593 }
594
595 if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V1_FN,
596 &event_cap)) {
597 if (event_cap & 0x20000)
598 return true;
599 }
600
601 if (dmi_check_system(button_array_table))
602 return true;
603
604 return false;
605 }
606
intel_hid_probe(struct platform_device * device)607 static int intel_hid_probe(struct platform_device *device)
608 {
609 acpi_handle handle = ACPI_HANDLE(&device->dev);
610 unsigned long long mode, dummy;
611 struct intel_hid_priv *priv;
612 acpi_status status;
613 int err;
614
615 intel_hid_init_dsm(handle);
616
617 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDMM_FN, &mode)) {
618 dev_warn(&device->dev, "failed to read mode\n");
619 return -ENODEV;
620 }
621
622 if (mode != 0) {
623 /*
624 * This driver only implements "simple" mode. There appear
625 * to be no other modes, but we should be paranoid and check
626 * for compatibility.
627 */
628 dev_info(&device->dev, "platform is not in simple mode\n");
629 return -ENODEV;
630 }
631
632 priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
633 if (!priv)
634 return -ENOMEM;
635 dev_set_drvdata(&device->dev, priv);
636
637 /* See dual_accel_detect.h for more info on the dual_accel check. */
638 priv->auto_add_switch = dmi_check_system(dmi_auto_add_switch) && !dual_accel_detect();
639
640 err = intel_hid_input_setup(device);
641 if (err) {
642 pr_err("Failed to setup Intel HID hotkeys\n");
643 return err;
644 }
645
646 /* Setup 5 button array */
647 if (button_array_present(device)) {
648 dev_info(&device->dev, "platform supports 5 button array\n");
649 err = intel_button_array_input_setup(device);
650 if (err)
651 pr_err("Failed to setup Intel 5 button array hotkeys\n");
652 }
653
654 /* Setup switches for devices that we know VGBS return correctly */
655 if (dmi_check_system(dmi_vgbs_allow_list)) {
656 dev_info(&device->dev, "platform supports switches\n");
657 err = intel_hid_switches_setup(device);
658 if (err)
659 pr_err("Failed to setup Intel HID switches\n");
660 else
661 report_tablet_mode_state(device);
662 }
663
664 status = acpi_install_notify_handler(handle,
665 ACPI_DEVICE_NOTIFY,
666 notify_handler,
667 device);
668 if (ACPI_FAILURE(status))
669 return -EBUSY;
670
671 err = intel_hid_set_enable(&device->dev, true);
672 if (err)
673 goto err_remove_notify;
674
675 intel_button_array_enable(&device->dev, true);
676
677 /*
678 * Call button load method to enable HID power button
679 * Always do this since it activates events on some devices without
680 * a button array too.
681 */
682 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_BTNL_FN, &dummy))
683 dev_warn(&device->dev, "failed to enable HID power button\n");
684
685 device_init_wakeup(&device->dev, true);
686 /*
687 * In order for system wakeup to work, the EC GPE has to be marked as
688 * a wakeup one, so do that here (this setting will persist, but it has
689 * no effect until the wakeup mask is set for the EC GPE).
690 */
691 acpi_ec_mark_gpe_for_wake();
692 return 0;
693
694 err_remove_notify:
695 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
696
697 return err;
698 }
699
intel_hid_remove(struct platform_device * device)700 static int intel_hid_remove(struct platform_device *device)
701 {
702 acpi_handle handle = ACPI_HANDLE(&device->dev);
703
704 device_init_wakeup(&device->dev, false);
705 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
706 intel_hid_set_enable(&device->dev, false);
707 intel_button_array_enable(&device->dev, false);
708
709 /*
710 * Even if we failed to shut off the event stream, we can still
711 * safely detach from the device.
712 */
713 return 0;
714 }
715
716 static struct platform_driver intel_hid_pl_driver = {
717 .driver = {
718 .name = "intel-hid",
719 .acpi_match_table = intel_hid_ids,
720 .pm = &intel_hid_pl_pm_ops,
721 },
722 .probe = intel_hid_probe,
723 .remove = intel_hid_remove,
724 };
725
726 /*
727 * Unfortunately, some laptops provide a _HID="INT33D5" device with
728 * _CID="PNP0C02". This causes the pnpacpi scan driver to claim the
729 * ACPI node, so no platform device will be created. The pnpacpi
730 * driver rejects this device in subsequent processing, so no physical
731 * node is created at all.
732 *
733 * As a workaround until the ACPI core figures out how to handle
734 * this corner case, manually ask the ACPI platform device code to
735 * claim the ACPI node.
736 */
737 static acpi_status __init
check_acpi_dev(acpi_handle handle,u32 lvl,void * context,void ** rv)738 check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
739 {
740 const struct acpi_device_id *ids = context;
741 struct acpi_device *dev = acpi_fetch_acpi_dev(handle);
742
743 if (dev && acpi_match_device_ids(dev, ids) == 0)
744 if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL)))
745 dev_info(&dev->dev,
746 "intel-hid: created platform device\n");
747
748 return AE_OK;
749 }
750
intel_hid_init(void)751 static int __init intel_hid_init(void)
752 {
753 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
754 ACPI_UINT32_MAX, check_acpi_dev, NULL,
755 (void *)intel_hid_ids, NULL);
756
757 return platform_driver_register(&intel_hid_pl_driver);
758 }
759 module_init(intel_hid_init);
760
intel_hid_exit(void)761 static void __exit intel_hid_exit(void)
762 {
763 platform_driver_unregister(&intel_hid_pl_driver);
764 }
765 module_exit(intel_hid_exit);
766