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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
19enum intel_hid_tablet_sw_mode {
20 TABLET_SW_AUTO = -1,
21 TABLET_SW_OFF = 0,
22 TABLET_SW_AT_EVENT,
23 TABLET_SW_AT_PROBE,
24};
25
26static bool enable_5_button_array;
27module_param(enable_5_button_array, bool, 0444);
28MODULE_PARM_DESC(enable_5_button_array,
29 "Enable 5 Button Array support. "
30 "If you need this please report this to: platform-driver-x86@vger.kernel.org");
31
32static int enable_sw_tablet_mode = TABLET_SW_AUTO;
33module_param(enable_sw_tablet_mode, int, 0444);
34MODULE_PARM_DESC(enable_sw_tablet_mode,
35 "Enable SW_TABLET_MODE reporting -1:auto 0:off 1:at-first-event 2:at-probe. "
36 "If you need this please report this to: platform-driver-x86@vger.kernel.org");
37
38/* When NOT in tablet mode, VGBS returns with the flag 0x40 */
39#define TABLET_MODE_FLAG BIT(6)
40
41MODULE_LICENSE("GPL");
42MODULE_AUTHOR("Alex Hung");
43
44static const struct acpi_device_id intel_hid_ids[] = {
45 {"INT33D5", 0},
46 {"INTC1051", 0},
47 {"INTC1054", 0},
48 {"INTC1070", 0},
49 {"INTC1076", 0},
50 {"INTC1077", 0},
51 {"INTC1078", 0},
52 {"", 0},
53};
54MODULE_DEVICE_TABLE(acpi, intel_hid_ids);
55
56/* In theory, these are HID usages. */
57static const struct key_entry intel_hid_keymap[] = {
58 /* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */
59 /* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */
60 { KE_KEY, 3, { KEY_NUMLOCK } },
61 { KE_KEY, 4, { KEY_HOME } },
62 { KE_KEY, 5, { KEY_END } },
63 { KE_KEY, 6, { KEY_PAGEUP } },
64 { KE_KEY, 7, { KEY_PAGEDOWN } },
65 { KE_KEY, 8, { KEY_RFKILL } },
66 { KE_KEY, 9, { KEY_POWER } },
67 { KE_KEY, 11, { KEY_SLEEP } },
68 /* 13 has two different meanings in the spec -- ignore it. */
69 { KE_KEY, 14, { KEY_STOPCD } },
70 { KE_KEY, 15, { KEY_PLAYPAUSE } },
71 { KE_KEY, 16, { KEY_MUTE } },
72 { KE_KEY, 17, { KEY_VOLUMEUP } },
73 { KE_KEY, 18, { KEY_VOLUMEDOWN } },
74 { KE_KEY, 19, { KEY_BRIGHTNESSUP } },
75 { KE_KEY, 20, { KEY_BRIGHTNESSDOWN } },
76 /* 27: wake -- needs special handling */
77 { KE_END },
78};
79
80/* 5 button array notification value. */
81static const struct key_entry intel_array_keymap[] = {
82 { KE_KEY, 0xC2, { KEY_LEFTMETA } }, /* Press */
83 { KE_IGNORE, 0xC3, { KEY_LEFTMETA } }, /* Release */
84 { KE_KEY, 0xC4, { KEY_VOLUMEUP } }, /* Press */
85 { KE_IGNORE, 0xC5, { KEY_VOLUMEUP } }, /* Release */
86 { KE_KEY, 0xC6, { KEY_VOLUMEDOWN } }, /* Press */
87 { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* Release */
88 { KE_KEY, 0xC8, { KEY_ROTATE_LOCK_TOGGLE } }, /* Press */
89 { KE_IGNORE, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } }, /* Release */
90 { KE_KEY, 0xCE, { KEY_POWER } }, /* Press */
91 { KE_IGNORE, 0xCF, { KEY_POWER } }, /* Release */
92 { KE_END },
93};
94
95static const struct dmi_system_id button_array_table[] = {
96 {
97 .ident = "Wacom MobileStudio Pro 13",
98 .matches = {
99 DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"),
100 DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 13"),
101 },
102 },
103 {
104 .ident = "Wacom MobileStudio Pro 16",
105 .matches = {
106 DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"),
107 DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 16"),
108 },
109 },
110 {
111 .ident = "HP Spectre x2 (2015)",
112 .matches = {
113 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
114 DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x2 Detachable"),
115 },
116 },
117 {
118 .ident = "Lenovo ThinkPad X1 Tablet Gen 2",
119 .matches = {
120 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
121 DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Tablet Gen 2"),
122 },
123 },
124 {
125 .ident = "Microsoft Surface Go 3",
126 .matches = {
127 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
128 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
129 },
130 },
131 { }
132};
133
134/*
135 * Some convertible use the intel-hid ACPI interface to report SW_TABLET_MODE,
136 * these need to be compared via a DMI based authorization list because some
137 * models have unreliable VGBS return which could cause incorrect
138 * SW_TABLET_MODE report.
139 */
140static const struct dmi_system_id dmi_vgbs_allow_list[] = {
141 {
142 .matches = {
143 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
144 DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x360 Convertible 15-df0xxx"),
145 },
146 },
147 {
148 .matches = {
149 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
150 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go"),
151 },
152 },
153 {
154 .matches = {
155 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
156 DMI_MATCH(DMI_PRODUCT_NAME, "HP Elite Dragonfly G2 Notebook PC"),
157 },
158 },
159 { }
160};
161
162/*
163 * Some devices, even non convertible ones, can send incorrect SW_TABLET_MODE
164 * reports. Accept such reports only from devices in this list.
165 */
166static const struct dmi_system_id dmi_auto_add_switch[] = {
167 {
168 .matches = {
169 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */),
170 },
171 },
172 {
173 .matches = {
174 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */),
175 },
176 },
177 {} /* Array terminator */
178};
179
180struct intel_hid_priv {
181 struct input_dev *input_dev;
182 struct input_dev *array;
183 struct input_dev *switches;
184 bool wakeup_mode;
185};
186
187#define HID_EVENT_FILTER_UUID "eeec56b3-4442-408f-a792-4edd4d758054"
188
189enum intel_hid_dsm_fn_codes {
190 INTEL_HID_DSM_FN_INVALID,
191 INTEL_HID_DSM_BTNL_FN,
192 INTEL_HID_DSM_HDMM_FN,
193 INTEL_HID_DSM_HDSM_FN,
194 INTEL_HID_DSM_HDEM_FN,
195 INTEL_HID_DSM_BTNS_FN,
196 INTEL_HID_DSM_BTNE_FN,
197 INTEL_HID_DSM_HEBC_V1_FN,
198 INTEL_HID_DSM_VGBS_FN,
199 INTEL_HID_DSM_HEBC_V2_FN,
200 INTEL_HID_DSM_FN_MAX
201};
202
203static const char *intel_hid_dsm_fn_to_method[INTEL_HID_DSM_FN_MAX] = {
204 NULL,
205 "BTNL",
206 "HDMM",
207 "HDSM",
208 "HDEM",
209 "BTNS",
210 "BTNE",
211 "HEBC",
212 "VGBS",
213 "HEBC"
214};
215
216static unsigned long long intel_hid_dsm_fn_mask;
217static guid_t intel_dsm_guid;
218
219static bool intel_hid_execute_method(acpi_handle handle,
220 enum intel_hid_dsm_fn_codes fn_index,
221 unsigned long long arg)
222{
223 union acpi_object *obj, argv4, req;
224 acpi_status status;
225 char *method_name;
226
227 if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
228 fn_index >= INTEL_HID_DSM_FN_MAX)
229 return false;
230
231 method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
232
233 if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
234 goto skip_dsm_exec;
235
236 /* All methods expects a package with one integer element */
237 req.type = ACPI_TYPE_INTEGER;
238 req.integer.value = arg;
239
240 argv4.type = ACPI_TYPE_PACKAGE;
241 argv4.package.count = 1;
242 argv4.package.elements = &req;
243
244 obj = acpi_evaluate_dsm(handle, &intel_dsm_guid, 1, fn_index, &argv4);
245 if (obj) {
246 acpi_handle_debug(handle, "Exec DSM Fn code: %d[%s] success\n",
247 fn_index, method_name);
248 ACPI_FREE(obj);
249 return true;
250 }
251
252skip_dsm_exec:
253 status = acpi_execute_simple_method(handle, method_name, arg);
254 if (ACPI_SUCCESS(status))
255 return true;
256
257 return false;
258}
259
260static bool intel_hid_evaluate_method(acpi_handle handle,
261 enum intel_hid_dsm_fn_codes fn_index,
262 unsigned long long *result)
263{
264 union acpi_object *obj;
265 acpi_status status;
266 char *method_name;
267
268 if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
269 fn_index >= INTEL_HID_DSM_FN_MAX)
270 return false;
271
272 method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
273
274 if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
275 goto skip_dsm_eval;
276
277 obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid,
278 1, fn_index,
279 NULL, ACPI_TYPE_INTEGER);
280 if (obj) {
281 *result = obj->integer.value;
282 acpi_handle_debug(handle,
283 "Eval DSM Fn code: %d[%s] results: 0x%llx\n",
284 fn_index, method_name, *result);
285 ACPI_FREE(obj);
286 return true;
287 }
288
289skip_dsm_eval:
290 status = acpi_evaluate_integer(handle, method_name, NULL, result);
291 if (ACPI_SUCCESS(status))
292 return true;
293
294 return false;
295}
296
297static void intel_hid_init_dsm(acpi_handle handle)
298{
299 union acpi_object *obj;
300
301 guid_parse(HID_EVENT_FILTER_UUID, &intel_dsm_guid);
302
303 obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid, 1, 0, NULL,
304 ACPI_TYPE_BUFFER);
305 if (obj) {
306 switch (obj->buffer.length) {
307 default:
308 case 2:
309 intel_hid_dsm_fn_mask = *(u16 *)obj->buffer.pointer;
310 break;
311 case 1:
312 intel_hid_dsm_fn_mask = *obj->buffer.pointer;
313 break;
314 case 0:
315 acpi_handle_warn(handle, "intel_hid_dsm_fn_mask length is zero\n");
316 intel_hid_dsm_fn_mask = 0;
317 break;
318 }
319 ACPI_FREE(obj);
320 }
321
322 acpi_handle_debug(handle, "intel_hid_dsm_fn_mask = %llx\n",
323 intel_hid_dsm_fn_mask);
324}
325
326static int intel_hid_set_enable(struct device *device, bool enable)
327{
328 acpi_handle handle = ACPI_HANDLE(device);
329
330 /* Enable|disable features - power button is always enabled */
331 if (!intel_hid_execute_method(handle, INTEL_HID_DSM_HDSM_FN,
332 enable)) {
333 dev_warn(device, "failed to %sable hotkeys\n",
334 enable ? "en" : "dis");
335 return -EIO;
336 }
337
338 return 0;
339}
340
341static void intel_button_array_enable(struct device *device, bool enable)
342{
343 struct intel_hid_priv *priv = dev_get_drvdata(device);
344 acpi_handle handle = ACPI_HANDLE(device);
345 unsigned long long button_cap;
346 acpi_status status;
347
348 if (!priv->array)
349 return;
350
351 /* Query supported platform features */
352 status = acpi_evaluate_integer(handle, "BTNC", NULL, &button_cap);
353 if (ACPI_FAILURE(status)) {
354 dev_warn(device, "failed to get button capability\n");
355 return;
356 }
357
358 /* Enable|disable features - power button is always enabled */
359 if (!intel_hid_execute_method(handle, INTEL_HID_DSM_BTNE_FN,
360 enable ? button_cap : 1))
361 dev_warn(device, "failed to set button capability\n");
362}
363
364static int intel_hid_pm_prepare(struct device *device)
365{
366 if (device_may_wakeup(device)) {
367 struct intel_hid_priv *priv = dev_get_drvdata(device);
368
369 priv->wakeup_mode = true;
370 }
371 return 0;
372}
373
374static void intel_hid_pm_complete(struct device *device)
375{
376 struct intel_hid_priv *priv = dev_get_drvdata(device);
377
378 priv->wakeup_mode = false;
379}
380
381static int intel_hid_pl_suspend_handler(struct device *device)
382{
383 intel_button_array_enable(device, false);
384
385 if (!pm_suspend_no_platform())
386 intel_hid_set_enable(device, false);
387
388 return 0;
389}
390
391static int intel_hid_pl_resume_handler(struct device *device)
392{
393 intel_hid_pm_complete(device);
394
395 if (!pm_suspend_no_platform())
396 intel_hid_set_enable(device, true);
397
398 intel_button_array_enable(device, true);
399 return 0;
400}
401
402static const struct dev_pm_ops intel_hid_pl_pm_ops = {
403 .prepare = intel_hid_pm_prepare,
404 .complete = intel_hid_pm_complete,
405 .freeze = intel_hid_pl_suspend_handler,
406 .thaw = intel_hid_pl_resume_handler,
407 .restore = intel_hid_pl_resume_handler,
408 .suspend = intel_hid_pl_suspend_handler,
409 .resume = intel_hid_pl_resume_handler,
410};
411
412static int intel_hid_input_setup(struct platform_device *device)
413{
414 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
415 int ret;
416
417 priv->input_dev = devm_input_allocate_device(&device->dev);
418 if (!priv->input_dev)
419 return -ENOMEM;
420
421 ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL);
422 if (ret)
423 return ret;
424
425 priv->input_dev->name = "Intel HID events";
426 priv->input_dev->id.bustype = BUS_HOST;
427
428 return input_register_device(priv->input_dev);
429}
430
431static int intel_button_array_input_setup(struct platform_device *device)
432{
433 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
434 int ret;
435
436 /* Setup input device for 5 button array */
437 priv->array = devm_input_allocate_device(&device->dev);
438 if (!priv->array)
439 return -ENOMEM;
440
441 ret = sparse_keymap_setup(priv->array, intel_array_keymap, NULL);
442 if (ret)
443 return ret;
444
445 priv->array->name = "Intel HID 5 button array";
446 priv->array->id.bustype = BUS_HOST;
447
448 return input_register_device(priv->array);
449}
450
451static int intel_hid_switches_setup(struct platform_device *device)
452{
453 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
454
455 /* Setup input device for switches */
456 priv->switches = devm_input_allocate_device(&device->dev);
457 if (!priv->switches)
458 return -ENOMEM;
459
460 __set_bit(EV_SW, priv->switches->evbit);
461 __set_bit(SW_TABLET_MODE, priv->switches->swbit);
462
463 priv->switches->name = "Intel HID switches";
464 priv->switches->id.bustype = BUS_HOST;
465 return input_register_device(priv->switches);
466}
467
468static void report_tablet_mode_state(struct platform_device *device)
469{
470 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
471 acpi_handle handle = ACPI_HANDLE(&device->dev);
472 unsigned long long vgbs;
473 int m;
474
475 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_VGBS_FN, &vgbs))
476 return;
477
478 m = !(vgbs & TABLET_MODE_FLAG);
479 input_report_switch(priv->switches, SW_TABLET_MODE, m);
480 input_sync(priv->switches);
481}
482
483static bool report_tablet_mode_event(struct input_dev *input_dev, u32 event)
484{
485 if (!input_dev)
486 return false;
487
488 switch (event) {
489 case 0xcc:
490 input_report_switch(input_dev, SW_TABLET_MODE, 1);
491 input_sync(input_dev);
492 return true;
493 case 0xcd:
494 input_report_switch(input_dev, SW_TABLET_MODE, 0);
495 input_sync(input_dev);
496 return true;
497 default:
498 return false;
499 }
500}
501
502static void notify_handler(acpi_handle handle, u32 event, void *context)
503{
504 struct platform_device *device = context;
505 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
506 unsigned long long ev_index;
507 int err;
508
509 /*
510 * Some convertible have unreliable VGBS return which could cause incorrect
511 * SW_TABLET_MODE report, in these cases we enable support when receiving
512 * the first event instead of during driver setup.
513 */
514 if (!priv->switches && enable_sw_tablet_mode == TABLET_SW_AT_EVENT &&
515 (event == 0xcc || event == 0xcd)) {
516 dev_info(&device->dev, "switch event received, enable switches supports\n");
517 err = intel_hid_switches_setup(device);
518 if (err)
519 pr_err("Failed to setup Intel HID switches\n");
520 }
521
522 if (priv->wakeup_mode) {
523 /*
524 * Needed for wakeup from suspend-to-idle to work on some
525 * platforms that don't expose the 5-button array, but still
526 * send notifies with the power button event code to this
527 * device object on power button actions while suspended.
528 */
529 if (event == 0xce)
530 goto wakeup;
531
532 /*
533 * Some devices send (duplicate) tablet-mode events when moved
534 * around even though the mode has not changed; and they do this
535 * even when suspended.
536 * Update the switch state in case it changed and then return
537 * without waking up to avoid spurious wakeups.
538 */
539 if (event == 0xcc || event == 0xcd) {
540 report_tablet_mode_event(priv->switches, event);
541 return;
542 }
543
544 /* Wake up on 5-button array events only. */
545 if (event == 0xc0 || !priv->array)
546 return;
547
548 if (!sparse_keymap_entry_from_scancode(priv->array, event)) {
549 dev_info(&device->dev, "unknown event 0x%x\n", event);
550 return;
551 }
552
553wakeup:
554 pm_wakeup_hard_event(&device->dev);
555
556 return;
557 }
558
559 /*
560 * Needed for suspend to work on some platforms that don't expose
561 * the 5-button array, but still send notifies with power button
562 * event code to this device object on power button actions.
563 *
564 * Report the power button press and release.
565 */
566 if (!priv->array) {
567 if (event == 0xce) {
568 input_report_key(priv->input_dev, KEY_POWER, 1);
569 input_sync(priv->input_dev);
570 return;
571 }
572
573 if (event == 0xcf) {
574 input_report_key(priv->input_dev, KEY_POWER, 0);
575 input_sync(priv->input_dev);
576 return;
577 }
578 }
579
580 if (report_tablet_mode_event(priv->switches, event))
581 return;
582
583 /* 0xC0 is for HID events, other values are for 5 button array */
584 if (event != 0xc0) {
585 if (!priv->array ||
586 !sparse_keymap_report_event(priv->array, event, 1, true))
587 dev_dbg(&device->dev, "unknown event 0x%x\n", event);
588 return;
589 }
590
591 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDEM_FN,
592 &ev_index)) {
593 dev_warn(&device->dev, "failed to get event index\n");
594 return;
595 }
596
597 if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true))
598 dev_dbg(&device->dev, "unknown event index 0x%llx\n",
599 ev_index);
600}
601
602static bool button_array_present(struct platform_device *device)
603{
604 acpi_handle handle = ACPI_HANDLE(&device->dev);
605 unsigned long long event_cap;
606
607 if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V2_FN,
608 &event_cap)) {
609 /* Check presence of 5 button array or v2 power button */
610 if (event_cap & 0x60000)
611 return true;
612 }
613
614 if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V1_FN,
615 &event_cap)) {
616 if (event_cap & 0x20000)
617 return true;
618 }
619
620 if (enable_5_button_array || dmi_check_system(button_array_table))
621 return true;
622
623 return false;
624}
625
626static int intel_hid_probe(struct platform_device *device)
627{
628 acpi_handle handle = ACPI_HANDLE(&device->dev);
629 unsigned long long mode, dummy;
630 struct intel_hid_priv *priv;
631 acpi_status status;
632 int err;
633
634 intel_hid_init_dsm(handle);
635
636 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDMM_FN, &mode)) {
637 dev_warn(&device->dev, "failed to read mode\n");
638 return -ENODEV;
639 }
640
641 if (mode != 0) {
642 /*
643 * This driver only implements "simple" mode. There appear
644 * to be no other modes, but we should be paranoid and check
645 * for compatibility.
646 */
647 dev_info(&device->dev, "platform is not in simple mode\n");
648 return -ENODEV;
649 }
650
651 priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
652 if (!priv)
653 return -ENOMEM;
654 dev_set_drvdata(&device->dev, priv);
655
656 /* See dual_accel_detect.h for more info on the dual_accel check. */
657 if (enable_sw_tablet_mode == TABLET_SW_AUTO) {
658 if (dmi_check_system(dmi_vgbs_allow_list))
659 enable_sw_tablet_mode = TABLET_SW_AT_PROBE;
660 else if (dmi_check_system(dmi_auto_add_switch) && !dual_accel_detect())
661 enable_sw_tablet_mode = TABLET_SW_AT_EVENT;
662 else
663 enable_sw_tablet_mode = TABLET_SW_OFF;
664 }
665
666 err = intel_hid_input_setup(device);
667 if (err) {
668 pr_err("Failed to setup Intel HID hotkeys\n");
669 return err;
670 }
671
672 /* Setup 5 button array */
673 if (button_array_present(device)) {
674 dev_info(&device->dev, "platform supports 5 button array\n");
675 err = intel_button_array_input_setup(device);
676 if (err)
677 pr_err("Failed to setup Intel 5 button array hotkeys\n");
678 }
679
680 /* Setup switches for devices that we know VGBS return correctly */
681 if (enable_sw_tablet_mode == TABLET_SW_AT_PROBE) {
682 dev_info(&device->dev, "platform supports switches\n");
683 err = intel_hid_switches_setup(device);
684 if (err)
685 pr_err("Failed to setup Intel HID switches\n");
686 else
687 report_tablet_mode_state(device);
688 }
689
690 status = acpi_install_notify_handler(handle,
691 ACPI_DEVICE_NOTIFY,
692 notify_handler,
693 device);
694 if (ACPI_FAILURE(status))
695 return -EBUSY;
696
697 err = intel_hid_set_enable(&device->dev, true);
698 if (err)
699 goto err_remove_notify;
700
701 intel_button_array_enable(&device->dev, true);
702
703 /*
704 * Call button load method to enable HID power button
705 * Always do this since it activates events on some devices without
706 * a button array too.
707 */
708 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_BTNL_FN, &dummy))
709 dev_warn(&device->dev, "failed to enable HID power button\n");
710
711 device_init_wakeup(&device->dev, true);
712 /*
713 * In order for system wakeup to work, the EC GPE has to be marked as
714 * a wakeup one, so do that here (this setting will persist, but it has
715 * no effect until the wakeup mask is set for the EC GPE).
716 */
717 acpi_ec_mark_gpe_for_wake();
718 return 0;
719
720err_remove_notify:
721 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
722
723 return err;
724}
725
726static void intel_hid_remove(struct platform_device *device)
727{
728 acpi_handle handle = ACPI_HANDLE(&device->dev);
729
730 device_init_wakeup(&device->dev, false);
731 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
732 intel_hid_set_enable(&device->dev, false);
733 intel_button_array_enable(&device->dev, false);
734}
735
736static struct platform_driver intel_hid_pl_driver = {
737 .driver = {
738 .name = "intel-hid",
739 .acpi_match_table = intel_hid_ids,
740 .pm = &intel_hid_pl_pm_ops,
741 },
742 .probe = intel_hid_probe,
743 .remove_new = intel_hid_remove,
744};
745
746/*
747 * Unfortunately, some laptops provide a _HID="INT33D5" device with
748 * _CID="PNP0C02". This causes the pnpacpi scan driver to claim the
749 * ACPI node, so no platform device will be created. The pnpacpi
750 * driver rejects this device in subsequent processing, so no physical
751 * node is created at all.
752 *
753 * As a workaround until the ACPI core figures out how to handle
754 * this corner case, manually ask the ACPI platform device code to
755 * claim the ACPI node.
756 */
757static acpi_status __init
758check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
759{
760 const struct acpi_device_id *ids = context;
761 struct acpi_device *dev = acpi_fetch_acpi_dev(handle);
762
763 if (dev && acpi_match_device_ids(dev, ids) == 0)
764 if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL)))
765 dev_info(&dev->dev,
766 "intel-hid: created platform device\n");
767
768 return AE_OK;
769}
770
771static int __init intel_hid_init(void)
772{
773 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
774 ACPI_UINT32_MAX, check_acpi_dev, NULL,
775 (void *)intel_hid_ids, NULL);
776
777 return platform_driver_register(&intel_hid_pl_driver);
778}
779module_init(intel_hid_init);
780
781static void __exit intel_hid_exit(void)
782{
783 platform_driver_unregister(&intel_hid_pl_driver);
784}
785module_exit(intel_hid_exit);