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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};
155
156/*
157 * Some devices, even non convertible ones, can send incorrect SW_TABLET_MODE
158 * reports. Accept such reports only from devices in this list.
159 */
160static const struct dmi_system_id dmi_auto_add_switch[] = {
161 {
162 .matches = {
163 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */),
164 },
165 },
166 {
167 .matches = {
168 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */),
169 },
170 },
171 {} /* Array terminator */
172};
173
174struct intel_hid_priv {
175 struct input_dev *input_dev;
176 struct input_dev *array;
177 struct input_dev *switches;
178 bool wakeup_mode;
179};
180
181#define HID_EVENT_FILTER_UUID "eeec56b3-4442-408f-a792-4edd4d758054"
182
183enum intel_hid_dsm_fn_codes {
184 INTEL_HID_DSM_FN_INVALID,
185 INTEL_HID_DSM_BTNL_FN,
186 INTEL_HID_DSM_HDMM_FN,
187 INTEL_HID_DSM_HDSM_FN,
188 INTEL_HID_DSM_HDEM_FN,
189 INTEL_HID_DSM_BTNS_FN,
190 INTEL_HID_DSM_BTNE_FN,
191 INTEL_HID_DSM_HEBC_V1_FN,
192 INTEL_HID_DSM_VGBS_FN,
193 INTEL_HID_DSM_HEBC_V2_FN,
194 INTEL_HID_DSM_FN_MAX
195};
196
197static const char *intel_hid_dsm_fn_to_method[INTEL_HID_DSM_FN_MAX] = {
198 NULL,
199 "BTNL",
200 "HDMM",
201 "HDSM",
202 "HDEM",
203 "BTNS",
204 "BTNE",
205 "HEBC",
206 "VGBS",
207 "HEBC"
208};
209
210static unsigned long long intel_hid_dsm_fn_mask;
211static guid_t intel_dsm_guid;
212
213static bool intel_hid_execute_method(acpi_handle handle,
214 enum intel_hid_dsm_fn_codes fn_index,
215 unsigned long long arg)
216{
217 union acpi_object *obj, argv4, req;
218 acpi_status status;
219 char *method_name;
220
221 if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
222 fn_index >= INTEL_HID_DSM_FN_MAX)
223 return false;
224
225 method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
226
227 if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
228 goto skip_dsm_exec;
229
230 /* All methods expects a package with one integer element */
231 req.type = ACPI_TYPE_INTEGER;
232 req.integer.value = arg;
233
234 argv4.type = ACPI_TYPE_PACKAGE;
235 argv4.package.count = 1;
236 argv4.package.elements = &req;
237
238 obj = acpi_evaluate_dsm(handle, &intel_dsm_guid, 1, fn_index, &argv4);
239 if (obj) {
240 acpi_handle_debug(handle, "Exec DSM Fn code: %d[%s] success\n",
241 fn_index, method_name);
242 ACPI_FREE(obj);
243 return true;
244 }
245
246skip_dsm_exec:
247 status = acpi_execute_simple_method(handle, method_name, arg);
248 if (ACPI_SUCCESS(status))
249 return true;
250
251 return false;
252}
253
254static bool intel_hid_evaluate_method(acpi_handle handle,
255 enum intel_hid_dsm_fn_codes fn_index,
256 unsigned long long *result)
257{
258 union acpi_object *obj;
259 acpi_status status;
260 char *method_name;
261
262 if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
263 fn_index >= INTEL_HID_DSM_FN_MAX)
264 return false;
265
266 method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
267
268 if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
269 goto skip_dsm_eval;
270
271 obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid,
272 1, fn_index,
273 NULL, ACPI_TYPE_INTEGER);
274 if (obj) {
275 *result = obj->integer.value;
276 acpi_handle_debug(handle,
277 "Eval DSM Fn code: %d[%s] results: 0x%llx\n",
278 fn_index, method_name, *result);
279 ACPI_FREE(obj);
280 return true;
281 }
282
283skip_dsm_eval:
284 status = acpi_evaluate_integer(handle, method_name, NULL, result);
285 if (ACPI_SUCCESS(status))
286 return true;
287
288 return false;
289}
290
291static void intel_hid_init_dsm(acpi_handle handle)
292{
293 union acpi_object *obj;
294
295 guid_parse(HID_EVENT_FILTER_UUID, &intel_dsm_guid);
296
297 obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid, 1, 0, NULL,
298 ACPI_TYPE_BUFFER);
299 if (obj) {
300 switch (obj->buffer.length) {
301 default:
302 case 2:
303 intel_hid_dsm_fn_mask = *(u16 *)obj->buffer.pointer;
304 break;
305 case 1:
306 intel_hid_dsm_fn_mask = *obj->buffer.pointer;
307 break;
308 case 0:
309 acpi_handle_warn(handle, "intel_hid_dsm_fn_mask length is zero\n");
310 intel_hid_dsm_fn_mask = 0;
311 break;
312 }
313 ACPI_FREE(obj);
314 }
315
316 acpi_handle_debug(handle, "intel_hid_dsm_fn_mask = %llx\n",
317 intel_hid_dsm_fn_mask);
318}
319
320static int intel_hid_set_enable(struct device *device, bool enable)
321{
322 acpi_handle handle = ACPI_HANDLE(device);
323
324 /* Enable|disable features - power button is always enabled */
325 if (!intel_hid_execute_method(handle, INTEL_HID_DSM_HDSM_FN,
326 enable)) {
327 dev_warn(device, "failed to %sable hotkeys\n",
328 enable ? "en" : "dis");
329 return -EIO;
330 }
331
332 return 0;
333}
334
335static void intel_button_array_enable(struct device *device, bool enable)
336{
337 struct intel_hid_priv *priv = dev_get_drvdata(device);
338 acpi_handle handle = ACPI_HANDLE(device);
339 unsigned long long button_cap;
340 acpi_status status;
341
342 if (!priv->array)
343 return;
344
345 /* Query supported platform features */
346 status = acpi_evaluate_integer(handle, "BTNC", NULL, &button_cap);
347 if (ACPI_FAILURE(status)) {
348 dev_warn(device, "failed to get button capability\n");
349 return;
350 }
351
352 /* Enable|disable features - power button is always enabled */
353 if (!intel_hid_execute_method(handle, INTEL_HID_DSM_BTNE_FN,
354 enable ? button_cap : 1))
355 dev_warn(device, "failed to set button capability\n");
356}
357
358static int intel_hid_pm_prepare(struct device *device)
359{
360 if (device_may_wakeup(device)) {
361 struct intel_hid_priv *priv = dev_get_drvdata(device);
362
363 priv->wakeup_mode = true;
364 }
365 return 0;
366}
367
368static void intel_hid_pm_complete(struct device *device)
369{
370 struct intel_hid_priv *priv = dev_get_drvdata(device);
371
372 priv->wakeup_mode = false;
373}
374
375static int intel_hid_pl_suspend_handler(struct device *device)
376{
377 intel_button_array_enable(device, false);
378
379 if (!pm_suspend_no_platform())
380 intel_hid_set_enable(device, false);
381
382 return 0;
383}
384
385static int intel_hid_pl_resume_handler(struct device *device)
386{
387 intel_hid_pm_complete(device);
388
389 if (!pm_suspend_no_platform())
390 intel_hid_set_enable(device, true);
391
392 intel_button_array_enable(device, true);
393 return 0;
394}
395
396static const struct dev_pm_ops intel_hid_pl_pm_ops = {
397 .prepare = intel_hid_pm_prepare,
398 .complete = intel_hid_pm_complete,
399 .freeze = intel_hid_pl_suspend_handler,
400 .thaw = intel_hid_pl_resume_handler,
401 .restore = intel_hid_pl_resume_handler,
402 .suspend = intel_hid_pl_suspend_handler,
403 .resume = intel_hid_pl_resume_handler,
404};
405
406static int intel_hid_input_setup(struct platform_device *device)
407{
408 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
409 int ret;
410
411 priv->input_dev = devm_input_allocate_device(&device->dev);
412 if (!priv->input_dev)
413 return -ENOMEM;
414
415 ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL);
416 if (ret)
417 return ret;
418
419 priv->input_dev->name = "Intel HID events";
420 priv->input_dev->id.bustype = BUS_HOST;
421
422 return input_register_device(priv->input_dev);
423}
424
425static int intel_button_array_input_setup(struct platform_device *device)
426{
427 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
428 int ret;
429
430 /* Setup input device for 5 button array */
431 priv->array = devm_input_allocate_device(&device->dev);
432 if (!priv->array)
433 return -ENOMEM;
434
435 ret = sparse_keymap_setup(priv->array, intel_array_keymap, NULL);
436 if (ret)
437 return ret;
438
439 priv->array->name = "Intel HID 5 button array";
440 priv->array->id.bustype = BUS_HOST;
441
442 return input_register_device(priv->array);
443}
444
445static int intel_hid_switches_setup(struct platform_device *device)
446{
447 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
448
449 /* Setup input device for switches */
450 priv->switches = devm_input_allocate_device(&device->dev);
451 if (!priv->switches)
452 return -ENOMEM;
453
454 __set_bit(EV_SW, priv->switches->evbit);
455 __set_bit(SW_TABLET_MODE, priv->switches->swbit);
456
457 priv->switches->name = "Intel HID switches";
458 priv->switches->id.bustype = BUS_HOST;
459 return input_register_device(priv->switches);
460}
461
462static void report_tablet_mode_state(struct platform_device *device)
463{
464 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
465 acpi_handle handle = ACPI_HANDLE(&device->dev);
466 unsigned long long vgbs;
467 int m;
468
469 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_VGBS_FN, &vgbs))
470 return;
471
472 m = !(vgbs & TABLET_MODE_FLAG);
473 input_report_switch(priv->switches, SW_TABLET_MODE, m);
474 input_sync(priv->switches);
475}
476
477static bool report_tablet_mode_event(struct input_dev *input_dev, u32 event)
478{
479 if (!input_dev)
480 return false;
481
482 switch (event) {
483 case 0xcc:
484 input_report_switch(input_dev, SW_TABLET_MODE, 1);
485 input_sync(input_dev);
486 return true;
487 case 0xcd:
488 input_report_switch(input_dev, SW_TABLET_MODE, 0);
489 input_sync(input_dev);
490 return true;
491 default:
492 return false;
493 }
494}
495
496static void notify_handler(acpi_handle handle, u32 event, void *context)
497{
498 struct platform_device *device = context;
499 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
500 unsigned long long ev_index;
501 int err;
502
503 /*
504 * Some convertible have unreliable VGBS return which could cause incorrect
505 * SW_TABLET_MODE report, in these cases we enable support when receiving
506 * the first event instead of during driver setup.
507 */
508 if (!priv->switches && enable_sw_tablet_mode == TABLET_SW_AT_EVENT &&
509 (event == 0xcc || event == 0xcd)) {
510 dev_info(&device->dev, "switch event received, enable switches supports\n");
511 err = intel_hid_switches_setup(device);
512 if (err)
513 pr_err("Failed to setup Intel HID switches\n");
514 }
515
516 if (priv->wakeup_mode) {
517 /*
518 * Needed for wakeup from suspend-to-idle to work on some
519 * platforms that don't expose the 5-button array, but still
520 * send notifies with the power button event code to this
521 * device object on power button actions while suspended.
522 */
523 if (event == 0xce)
524 goto wakeup;
525
526 /*
527 * Some devices send (duplicate) tablet-mode events when moved
528 * around even though the mode has not changed; and they do this
529 * even when suspended.
530 * Update the switch state in case it changed and then return
531 * without waking up to avoid spurious wakeups.
532 */
533 if (event == 0xcc || event == 0xcd) {
534 report_tablet_mode_event(priv->switches, event);
535 return;
536 }
537
538 /* Wake up on 5-button array events only. */
539 if (event == 0xc0 || !priv->array)
540 return;
541
542 if (!sparse_keymap_entry_from_scancode(priv->array, event)) {
543 dev_info(&device->dev, "unknown event 0x%x\n", event);
544 return;
545 }
546
547wakeup:
548 pm_wakeup_hard_event(&device->dev);
549
550 return;
551 }
552
553 /*
554 * Needed for suspend to work on some platforms that don't expose
555 * the 5-button array, but still send notifies with power button
556 * event code to this device object on power button actions.
557 *
558 * Report the power button press and release.
559 */
560 if (!priv->array) {
561 if (event == 0xce) {
562 input_report_key(priv->input_dev, KEY_POWER, 1);
563 input_sync(priv->input_dev);
564 return;
565 }
566
567 if (event == 0xcf) {
568 input_report_key(priv->input_dev, KEY_POWER, 0);
569 input_sync(priv->input_dev);
570 return;
571 }
572 }
573
574 if (report_tablet_mode_event(priv->switches, event))
575 return;
576
577 /* 0xC0 is for HID events, other values are for 5 button array */
578 if (event != 0xc0) {
579 if (!priv->array ||
580 !sparse_keymap_report_event(priv->array, event, 1, true))
581 dev_dbg(&device->dev, "unknown event 0x%x\n", event);
582 return;
583 }
584
585 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDEM_FN,
586 &ev_index)) {
587 dev_warn(&device->dev, "failed to get event index\n");
588 return;
589 }
590
591 if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true))
592 dev_dbg(&device->dev, "unknown event index 0x%llx\n",
593 ev_index);
594}
595
596static bool button_array_present(struct platform_device *device)
597{
598 acpi_handle handle = ACPI_HANDLE(&device->dev);
599 unsigned long long event_cap;
600
601 if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V2_FN,
602 &event_cap)) {
603 /* Check presence of 5 button array or v2 power button */
604 if (event_cap & 0x60000)
605 return true;
606 }
607
608 if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V1_FN,
609 &event_cap)) {
610 if (event_cap & 0x20000)
611 return true;
612 }
613
614 if (enable_5_button_array || dmi_check_system(button_array_table))
615 return true;
616
617 return false;
618}
619
620static int intel_hid_probe(struct platform_device *device)
621{
622 acpi_handle handle = ACPI_HANDLE(&device->dev);
623 unsigned long long mode;
624 struct intel_hid_priv *priv;
625 acpi_status status;
626 int err;
627
628 intel_hid_init_dsm(handle);
629
630 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDMM_FN, &mode)) {
631 dev_warn(&device->dev, "failed to read mode\n");
632 return -ENODEV;
633 }
634
635 if (mode != 0) {
636 /*
637 * This driver only implements "simple" mode. There appear
638 * to be no other modes, but we should be paranoid and check
639 * for compatibility.
640 */
641 dev_info(&device->dev, "platform is not in simple mode\n");
642 return -ENODEV;
643 }
644
645 priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
646 if (!priv)
647 return -ENOMEM;
648 dev_set_drvdata(&device->dev, priv);
649
650 /* See dual_accel_detect.h for more info on the dual_accel check. */
651 if (enable_sw_tablet_mode == TABLET_SW_AUTO) {
652 if (dmi_check_system(dmi_vgbs_allow_list))
653 enable_sw_tablet_mode = TABLET_SW_AT_PROBE;
654 else if (dmi_check_system(dmi_auto_add_switch) && !dual_accel_detect())
655 enable_sw_tablet_mode = TABLET_SW_AT_EVENT;
656 else
657 enable_sw_tablet_mode = TABLET_SW_OFF;
658 }
659
660 err = intel_hid_input_setup(device);
661 if (err) {
662 pr_err("Failed to setup Intel HID hotkeys\n");
663 return err;
664 }
665
666 /* Setup 5 button array */
667 if (button_array_present(device)) {
668 dev_info(&device->dev, "platform supports 5 button array\n");
669 err = intel_button_array_input_setup(device);
670 if (err)
671 pr_err("Failed to setup Intel 5 button array hotkeys\n");
672 }
673
674 /* Setup switches for devices that we know VGBS return correctly */
675 if (enable_sw_tablet_mode == TABLET_SW_AT_PROBE) {
676 dev_info(&device->dev, "platform supports switches\n");
677 err = intel_hid_switches_setup(device);
678 if (err)
679 pr_err("Failed to setup Intel HID switches\n");
680 else
681 report_tablet_mode_state(device);
682 }
683
684 status = acpi_install_notify_handler(handle,
685 ACPI_DEVICE_NOTIFY,
686 notify_handler,
687 device);
688 if (ACPI_FAILURE(status))
689 return -EBUSY;
690
691 err = intel_hid_set_enable(&device->dev, true);
692 if (err)
693 goto err_remove_notify;
694
695 if (priv->array) {
696 unsigned long long dummy;
697
698 intel_button_array_enable(&device->dev, true);
699
700 /* Call button load method to enable HID power button */
701 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_BTNL_FN,
702 &dummy)) {
703 dev_warn(&device->dev,
704 "failed to enable HID power button\n");
705 }
706 }
707
708 device_init_wakeup(&device->dev, true);
709 /*
710 * In order for system wakeup to work, the EC GPE has to be marked as
711 * a wakeup one, so do that here (this setting will persist, but it has
712 * no effect until the wakeup mask is set for the EC GPE).
713 */
714 acpi_ec_mark_gpe_for_wake();
715 return 0;
716
717err_remove_notify:
718 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
719
720 return err;
721}
722
723static int intel_hid_remove(struct platform_device *device)
724{
725 acpi_handle handle = ACPI_HANDLE(&device->dev);
726
727 device_init_wakeup(&device->dev, false);
728 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
729 intel_hid_set_enable(&device->dev, false);
730 intel_button_array_enable(&device->dev, false);
731
732 /*
733 * Even if we failed to shut off the event stream, we can still
734 * safely detach from the device.
735 */
736 return 0;
737}
738
739static struct platform_driver intel_hid_pl_driver = {
740 .driver = {
741 .name = "intel-hid",
742 .acpi_match_table = intel_hid_ids,
743 .pm = &intel_hid_pl_pm_ops,
744 },
745 .probe = intel_hid_probe,
746 .remove = intel_hid_remove,
747};
748
749/*
750 * Unfortunately, some laptops provide a _HID="INT33D5" device with
751 * _CID="PNP0C02". This causes the pnpacpi scan driver to claim the
752 * ACPI node, so no platform device will be created. The pnpacpi
753 * driver rejects this device in subsequent processing, so no physical
754 * node is created at all.
755 *
756 * As a workaround until the ACPI core figures out how to handle
757 * this corner case, manually ask the ACPI platform device code to
758 * claim the ACPI node.
759 */
760static acpi_status __init
761check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
762{
763 const struct acpi_device_id *ids = context;
764 struct acpi_device *dev = acpi_fetch_acpi_dev(handle);
765
766 if (dev && acpi_match_device_ids(dev, ids) == 0)
767 if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL)))
768 dev_info(&dev->dev,
769 "intel-hid: created platform device\n");
770
771 return AE_OK;
772}
773
774static int __init intel_hid_init(void)
775{
776 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
777 ACPI_UINT32_MAX, check_acpi_dev, NULL,
778 (void *)intel_hid_ids, NULL);
779
780 return platform_driver_register(&intel_hid_pl_driver);
781}
782module_init(intel_hid_init);
783
784static void __exit intel_hid_exit(void)
785{
786 platform_driver_unregister(&intel_hid_pl_driver);
787}
788module_exit(intel_hid_exit);
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/string_choices.h>
17#include <linux/suspend.h>
18#include "../dual_accel_detect.h"
19
20enum intel_hid_tablet_sw_mode {
21 TABLET_SW_AUTO = -1,
22 TABLET_SW_OFF = 0,
23 TABLET_SW_AT_EVENT,
24 TABLET_SW_AT_PROBE,
25};
26
27static bool enable_5_button_array;
28module_param(enable_5_button_array, bool, 0444);
29MODULE_PARM_DESC(enable_5_button_array,
30 "Enable 5 Button Array support. "
31 "If you need this please report this to: platform-driver-x86@vger.kernel.org");
32
33static int enable_sw_tablet_mode = TABLET_SW_AUTO;
34module_param(enable_sw_tablet_mode, int, 0444);
35MODULE_PARM_DESC(enable_sw_tablet_mode,
36 "Enable SW_TABLET_MODE reporting -1:auto 0:off 1:at-first-event 2:at-probe. "
37 "If you need this please report this to: platform-driver-x86@vger.kernel.org");
38
39/* When NOT in tablet mode, VGBS returns with the flag 0x40 */
40#define TABLET_MODE_FLAG BIT(6)
41
42MODULE_DESCRIPTION("Intel HID Event hotkey driver");
43MODULE_LICENSE("GPL");
44MODULE_AUTHOR("Alex Hung");
45
46static const struct acpi_device_id intel_hid_ids[] = {
47 {"INT33D5", 0},
48 {"INTC1051", 0},
49 {"INTC1054", 0},
50 {"INTC1070", 0},
51 {"INTC1076", 0},
52 {"INTC1077", 0},
53 {"INTC1078", 0},
54 {"INTC107B", 0},
55 {"INTC10CB", 0},
56 {"", 0},
57};
58MODULE_DEVICE_TABLE(acpi, intel_hid_ids);
59
60/* In theory, these are HID usages. */
61static const struct key_entry intel_hid_keymap[] = {
62 /* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */
63 /* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */
64 { KE_KEY, 3, { KEY_NUMLOCK } },
65 { KE_KEY, 4, { KEY_HOME } },
66 { KE_KEY, 5, { KEY_END } },
67 { KE_KEY, 6, { KEY_PAGEUP } },
68 { KE_KEY, 7, { KEY_PAGEDOWN } },
69 { KE_KEY, 8, { KEY_RFKILL } },
70 { KE_KEY, 9, { KEY_POWER } },
71 { KE_KEY, 11, { KEY_SLEEP } },
72 /* 13 has two different meanings in the spec -- ignore it. */
73 { KE_KEY, 14, { KEY_STOPCD } },
74 { KE_KEY, 15, { KEY_PLAYPAUSE } },
75 { KE_KEY, 16, { KEY_MUTE } },
76 { KE_KEY, 17, { KEY_VOLUMEUP } },
77 { KE_KEY, 18, { KEY_VOLUMEDOWN } },
78 { KE_KEY, 19, { KEY_BRIGHTNESSUP } },
79 { KE_KEY, 20, { KEY_BRIGHTNESSDOWN } },
80 /* 27: wake -- needs special handling */
81 { KE_END },
82};
83
84/* 5 button array notification value. */
85static const struct key_entry intel_array_keymap[] = {
86 { KE_KEY, 0xC2, { KEY_LEFTMETA } }, /* Press */
87 { KE_IGNORE, 0xC3, { KEY_LEFTMETA } }, /* Release */
88 { KE_KEY, 0xC4, { KEY_VOLUMEUP } }, /* Press */
89 { KE_IGNORE, 0xC5, { KEY_VOLUMEUP } }, /* Release */
90 { KE_KEY, 0xC6, { KEY_VOLUMEDOWN } }, /* Press */
91 { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* Release */
92 { KE_KEY, 0xC8, { KEY_ROTATE_LOCK_TOGGLE } }, /* Press */
93 { KE_IGNORE, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } }, /* Release */
94 { KE_KEY, 0xCE, { KEY_POWER } }, /* Press */
95 { KE_IGNORE, 0xCF, { KEY_POWER } }, /* Release */
96 { KE_END },
97};
98
99static const struct dmi_system_id button_array_table[] = {
100 {
101 .ident = "Wacom MobileStudio Pro 13",
102 .matches = {
103 DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"),
104 DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 13"),
105 },
106 },
107 {
108 .ident = "Wacom MobileStudio Pro 16",
109 .matches = {
110 DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"),
111 DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 16"),
112 },
113 },
114 {
115 .ident = "HP Spectre x2 (2015)",
116 .matches = {
117 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
118 DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x2 Detachable"),
119 },
120 },
121 {
122 .ident = "Lenovo ThinkPad X1 Tablet Gen 1",
123 .matches = {
124 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
125 DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X12 Detachable Gen 1"),
126 },
127 },
128 {
129 .ident = "Lenovo ThinkPad X1 Tablet Gen 2",
130 .matches = {
131 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
132 DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Tablet Gen 2"),
133 },
134 },
135 {
136 .ident = "Microsoft Surface Go 3",
137 .matches = {
138 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
139 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
140 },
141 },
142 { }
143};
144
145/*
146 * Some convertible use the intel-hid ACPI interface to report SW_TABLET_MODE,
147 * these need to be compared via a DMI based authorization list because some
148 * models have unreliable VGBS return which could cause incorrect
149 * SW_TABLET_MODE report.
150 */
151static const struct dmi_system_id dmi_vgbs_allow_list[] = {
152 {
153 .matches = {
154 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
155 DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x360 Convertible 15-df0xxx"),
156 },
157 },
158 {
159 .matches = {
160 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
161 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go"),
162 },
163 },
164 {
165 .matches = {
166 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
167 DMI_MATCH(DMI_PRODUCT_NAME, "HP Elite Dragonfly G2 Notebook PC"),
168 },
169 },
170 { }
171};
172
173/*
174 * Some devices, even non convertible ones, can send incorrect SW_TABLET_MODE
175 * reports. Accept such reports only from devices in this list.
176 */
177static const struct dmi_system_id dmi_auto_add_switch[] = {
178 {
179 .matches = {
180 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */),
181 },
182 },
183 {
184 .matches = {
185 DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */),
186 },
187 },
188 {} /* Array terminator */
189};
190
191struct intel_hid_priv {
192 struct input_dev *input_dev;
193 struct input_dev *array;
194 struct input_dev *switches;
195 bool wakeup_mode;
196};
197
198#define HID_EVENT_FILTER_UUID "eeec56b3-4442-408f-a792-4edd4d758054"
199
200enum intel_hid_dsm_fn_codes {
201 INTEL_HID_DSM_FN_INVALID,
202 INTEL_HID_DSM_BTNL_FN,
203 INTEL_HID_DSM_HDMM_FN,
204 INTEL_HID_DSM_HDSM_FN,
205 INTEL_HID_DSM_HDEM_FN,
206 INTEL_HID_DSM_BTNS_FN,
207 INTEL_HID_DSM_BTNE_FN,
208 INTEL_HID_DSM_HEBC_V1_FN,
209 INTEL_HID_DSM_VGBS_FN,
210 INTEL_HID_DSM_HEBC_V2_FN,
211 INTEL_HID_DSM_FN_MAX
212};
213
214static const char *intel_hid_dsm_fn_to_method[INTEL_HID_DSM_FN_MAX] = {
215 NULL,
216 "BTNL",
217 "HDMM",
218 "HDSM",
219 "HDEM",
220 "BTNS",
221 "BTNE",
222 "HEBC",
223 "VGBS",
224 "HEBC"
225};
226
227static unsigned long long intel_hid_dsm_fn_mask;
228static guid_t intel_dsm_guid;
229
230static bool intel_hid_execute_method(acpi_handle handle,
231 enum intel_hid_dsm_fn_codes fn_index,
232 unsigned long long arg)
233{
234 union acpi_object *obj, argv4, req;
235 acpi_status status;
236 char *method_name;
237
238 if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
239 fn_index >= INTEL_HID_DSM_FN_MAX)
240 return false;
241
242 method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
243
244 if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
245 goto skip_dsm_exec;
246
247 /* All methods expects a package with one integer element */
248 req.type = ACPI_TYPE_INTEGER;
249 req.integer.value = arg;
250
251 argv4.type = ACPI_TYPE_PACKAGE;
252 argv4.package.count = 1;
253 argv4.package.elements = &req;
254
255 obj = acpi_evaluate_dsm(handle, &intel_dsm_guid, 1, fn_index, &argv4);
256 if (obj) {
257 acpi_handle_debug(handle, "Exec DSM Fn code: %d[%s] success\n",
258 fn_index, method_name);
259 ACPI_FREE(obj);
260 return true;
261 }
262
263skip_dsm_exec:
264 status = acpi_execute_simple_method(handle, method_name, arg);
265 if (ACPI_SUCCESS(status))
266 return true;
267
268 return false;
269}
270
271static bool intel_hid_evaluate_method(acpi_handle handle,
272 enum intel_hid_dsm_fn_codes fn_index,
273 unsigned long long *result)
274{
275 union acpi_object *obj;
276 acpi_status status;
277 char *method_name;
278
279 if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
280 fn_index >= INTEL_HID_DSM_FN_MAX)
281 return false;
282
283 method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
284
285 if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
286 goto skip_dsm_eval;
287
288 obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid,
289 1, fn_index,
290 NULL, ACPI_TYPE_INTEGER);
291 if (obj) {
292 *result = obj->integer.value;
293 acpi_handle_debug(handle,
294 "Eval DSM Fn code: %d[%s] results: 0x%llx\n",
295 fn_index, method_name, *result);
296 ACPI_FREE(obj);
297 return true;
298 }
299
300skip_dsm_eval:
301 status = acpi_evaluate_integer(handle, method_name, NULL, result);
302 if (ACPI_SUCCESS(status))
303 return true;
304
305 return false;
306}
307
308static void intel_hid_init_dsm(acpi_handle handle)
309{
310 union acpi_object *obj;
311
312 guid_parse(HID_EVENT_FILTER_UUID, &intel_dsm_guid);
313
314 obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid, 1, 0, NULL,
315 ACPI_TYPE_BUFFER);
316 if (obj) {
317 switch (obj->buffer.length) {
318 default:
319 case 2:
320 intel_hid_dsm_fn_mask = *(u16 *)obj->buffer.pointer;
321 break;
322 case 1:
323 intel_hid_dsm_fn_mask = *obj->buffer.pointer;
324 break;
325 case 0:
326 acpi_handle_warn(handle, "intel_hid_dsm_fn_mask length is zero\n");
327 intel_hid_dsm_fn_mask = 0;
328 break;
329 }
330 ACPI_FREE(obj);
331 }
332
333 acpi_handle_debug(handle, "intel_hid_dsm_fn_mask = %llx\n",
334 intel_hid_dsm_fn_mask);
335}
336
337static int intel_hid_set_enable(struct device *device, bool enable)
338{
339 acpi_handle handle = ACPI_HANDLE(device);
340
341 /* Enable|disable features - power button is always enabled */
342 if (!intel_hid_execute_method(handle, INTEL_HID_DSM_HDSM_FN, enable)) {
343 dev_warn(device, "failed to %s hotkeys\n", str_enable_disable(enable));
344 return -EIO;
345 }
346
347 return 0;
348}
349
350static void intel_button_array_enable(struct device *device, bool enable)
351{
352 struct intel_hid_priv *priv = dev_get_drvdata(device);
353 acpi_handle handle = ACPI_HANDLE(device);
354 unsigned long long button_cap;
355 acpi_status status;
356
357 if (!priv->array)
358 return;
359
360 /* Query supported platform features */
361 status = acpi_evaluate_integer(handle, "BTNC", NULL, &button_cap);
362 if (ACPI_FAILURE(status)) {
363 dev_warn(device, "failed to get button capability\n");
364 return;
365 }
366
367 /* Enable|disable features - power button is always enabled */
368 if (!intel_hid_execute_method(handle, INTEL_HID_DSM_BTNE_FN,
369 enable ? button_cap : 1))
370 dev_warn(device, "failed to set button capability\n");
371}
372
373static int intel_hid_pm_prepare(struct device *device)
374{
375 if (device_may_wakeup(device)) {
376 struct intel_hid_priv *priv = dev_get_drvdata(device);
377
378 priv->wakeup_mode = true;
379 }
380 return 0;
381}
382
383static void intel_hid_pm_complete(struct device *device)
384{
385 struct intel_hid_priv *priv = dev_get_drvdata(device);
386
387 priv->wakeup_mode = false;
388}
389
390static int intel_hid_pl_suspend_handler(struct device *device)
391{
392 intel_button_array_enable(device, false);
393
394 if (!pm_suspend_no_platform())
395 intel_hid_set_enable(device, false);
396
397 return 0;
398}
399
400static int intel_hid_pl_resume_handler(struct device *device)
401{
402 intel_hid_pm_complete(device);
403
404 if (!pm_suspend_no_platform())
405 intel_hid_set_enable(device, true);
406
407 intel_button_array_enable(device, true);
408 return 0;
409}
410
411static const struct dev_pm_ops intel_hid_pl_pm_ops = {
412 .prepare = intel_hid_pm_prepare,
413 .complete = intel_hid_pm_complete,
414 .freeze = intel_hid_pl_suspend_handler,
415 .thaw = intel_hid_pl_resume_handler,
416 .restore = intel_hid_pl_resume_handler,
417 .suspend = intel_hid_pl_suspend_handler,
418 .resume = intel_hid_pl_resume_handler,
419};
420
421static int intel_hid_input_setup(struct platform_device *device)
422{
423 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
424 int ret;
425
426 priv->input_dev = devm_input_allocate_device(&device->dev);
427 if (!priv->input_dev)
428 return -ENOMEM;
429
430 ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL);
431 if (ret)
432 return ret;
433
434 priv->input_dev->name = "Intel HID events";
435 priv->input_dev->id.bustype = BUS_HOST;
436
437 return input_register_device(priv->input_dev);
438}
439
440static int intel_button_array_input_setup(struct platform_device *device)
441{
442 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
443 int ret;
444
445 /* Setup input device for 5 button array */
446 priv->array = devm_input_allocate_device(&device->dev);
447 if (!priv->array)
448 return -ENOMEM;
449
450 ret = sparse_keymap_setup(priv->array, intel_array_keymap, NULL);
451 if (ret)
452 return ret;
453
454 priv->array->name = "Intel HID 5 button array";
455 priv->array->id.bustype = BUS_HOST;
456
457 return input_register_device(priv->array);
458}
459
460static int intel_hid_switches_setup(struct platform_device *device)
461{
462 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
463
464 /* Setup input device for switches */
465 priv->switches = devm_input_allocate_device(&device->dev);
466 if (!priv->switches)
467 return -ENOMEM;
468
469 __set_bit(EV_SW, priv->switches->evbit);
470 __set_bit(SW_TABLET_MODE, priv->switches->swbit);
471
472 priv->switches->name = "Intel HID switches";
473 priv->switches->id.bustype = BUS_HOST;
474 return input_register_device(priv->switches);
475}
476
477static void report_tablet_mode_state(struct platform_device *device)
478{
479 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
480 acpi_handle handle = ACPI_HANDLE(&device->dev);
481 unsigned long long vgbs;
482 int m;
483
484 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_VGBS_FN, &vgbs))
485 return;
486
487 m = !(vgbs & TABLET_MODE_FLAG);
488 input_report_switch(priv->switches, SW_TABLET_MODE, m);
489 input_sync(priv->switches);
490}
491
492static bool report_tablet_mode_event(struct input_dev *input_dev, u32 event)
493{
494 if (!input_dev)
495 return false;
496
497 switch (event) {
498 case 0xcc:
499 input_report_switch(input_dev, SW_TABLET_MODE, 1);
500 input_sync(input_dev);
501 return true;
502 case 0xcd:
503 input_report_switch(input_dev, SW_TABLET_MODE, 0);
504 input_sync(input_dev);
505 return true;
506 default:
507 return false;
508 }
509}
510
511static void notify_handler(acpi_handle handle, u32 event, void *context)
512{
513 struct platform_device *device = context;
514 struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
515 unsigned long long ev_index;
516 struct key_entry *ke;
517 int err;
518
519 /*
520 * Some convertible have unreliable VGBS return which could cause incorrect
521 * SW_TABLET_MODE report, in these cases we enable support when receiving
522 * the first event instead of during driver setup.
523 */
524 if (!priv->switches && enable_sw_tablet_mode == TABLET_SW_AT_EVENT &&
525 (event == 0xcc || event == 0xcd)) {
526 dev_info(&device->dev, "switch event received, enable switches supports\n");
527 err = intel_hid_switches_setup(device);
528 if (err)
529 pr_err("Failed to setup Intel HID switches\n");
530 }
531
532 if (priv->wakeup_mode) {
533 /*
534 * Needed for wakeup from suspend-to-idle to work on some
535 * platforms that don't expose the 5-button array, but still
536 * send notifies with the power button event code to this
537 * device object on power button actions while suspended.
538 */
539 if (event == 0xce)
540 goto wakeup;
541
542 /*
543 * Some devices send (duplicate) tablet-mode events when moved
544 * around even though the mode has not changed; and they do this
545 * even when suspended.
546 * Update the switch state in case it changed and then return
547 * without waking up to avoid spurious wakeups.
548 */
549 if (event == 0xcc || event == 0xcd) {
550 report_tablet_mode_event(priv->switches, event);
551 return;
552 }
553
554 /* Wake up on 5-button array events only. */
555 if (event == 0xc0 || !priv->array)
556 return;
557
558 ke = sparse_keymap_entry_from_scancode(priv->array, event);
559 if (!ke) {
560 dev_info(&device->dev, "unknown event 0x%x\n", event);
561 return;
562 }
563
564 if (ke->type == KE_IGNORE)
565 return;
566
567wakeup:
568 pm_wakeup_hard_event(&device->dev);
569
570 return;
571 }
572
573 /*
574 * Needed for suspend to work on some platforms that don't expose
575 * the 5-button array, but still send notifies with power button
576 * event code to this device object on power button actions.
577 *
578 * Report the power button press and release.
579 */
580 if (!priv->array) {
581 if (event == 0xce) {
582 input_report_key(priv->input_dev, KEY_POWER, 1);
583 input_sync(priv->input_dev);
584 return;
585 }
586
587 if (event == 0xcf) {
588 input_report_key(priv->input_dev, KEY_POWER, 0);
589 input_sync(priv->input_dev);
590 return;
591 }
592 }
593
594 if (report_tablet_mode_event(priv->switches, event))
595 return;
596
597 /* 0xC0 is for HID events, other values are for 5 button array */
598 if (event != 0xc0) {
599 if (!priv->array ||
600 !sparse_keymap_report_event(priv->array, event, 1, true))
601 dev_dbg(&device->dev, "unknown event 0x%x\n", event);
602 return;
603 }
604
605 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDEM_FN,
606 &ev_index)) {
607 dev_warn(&device->dev, "failed to get event index\n");
608 return;
609 }
610
611 if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true))
612 dev_dbg(&device->dev, "unknown event index 0x%llx\n",
613 ev_index);
614}
615
616static bool button_array_present(struct platform_device *device)
617{
618 acpi_handle handle = ACPI_HANDLE(&device->dev);
619 unsigned long long event_cap;
620
621 if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V2_FN,
622 &event_cap)) {
623 /* Check presence of 5 button array or v2 power button */
624 if (event_cap & 0x60000)
625 return true;
626 }
627
628 if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V1_FN,
629 &event_cap)) {
630 if (event_cap & 0x20000)
631 return true;
632 }
633
634 if (enable_5_button_array || dmi_check_system(button_array_table))
635 return true;
636
637 return false;
638}
639
640static int intel_hid_probe(struct platform_device *device)
641{
642 acpi_handle handle = ACPI_HANDLE(&device->dev);
643 unsigned long long mode, dummy;
644 struct intel_hid_priv *priv;
645 acpi_status status;
646 int err;
647
648 intel_hid_init_dsm(handle);
649
650 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDMM_FN, &mode)) {
651 dev_warn(&device->dev, "failed to read mode\n");
652 return -ENODEV;
653 }
654
655 if (mode != 0) {
656 /*
657 * This driver only implements "simple" mode. There appear
658 * to be no other modes, but we should be paranoid and check
659 * for compatibility.
660 */
661 dev_info(&device->dev, "platform is not in simple mode\n");
662 return -ENODEV;
663 }
664
665 priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
666 if (!priv)
667 return -ENOMEM;
668 dev_set_drvdata(&device->dev, priv);
669
670 /* See dual_accel_detect.h for more info on the dual_accel check. */
671 if (enable_sw_tablet_mode == TABLET_SW_AUTO) {
672 if (dmi_check_system(dmi_vgbs_allow_list))
673 enable_sw_tablet_mode = TABLET_SW_AT_PROBE;
674 else if (dmi_check_system(dmi_auto_add_switch) && !dual_accel_detect())
675 enable_sw_tablet_mode = TABLET_SW_AT_EVENT;
676 else
677 enable_sw_tablet_mode = TABLET_SW_OFF;
678 }
679
680 err = intel_hid_input_setup(device);
681 if (err) {
682 pr_err("Failed to setup Intel HID hotkeys\n");
683 return err;
684 }
685
686 /* Setup 5 button array */
687 if (button_array_present(device)) {
688 dev_info(&device->dev, "platform supports 5 button array\n");
689 err = intel_button_array_input_setup(device);
690 if (err)
691 pr_err("Failed to setup Intel 5 button array hotkeys\n");
692 }
693
694 /* Setup switches for devices that we know VGBS return correctly */
695 if (enable_sw_tablet_mode == TABLET_SW_AT_PROBE) {
696 dev_info(&device->dev, "platform supports switches\n");
697 err = intel_hid_switches_setup(device);
698 if (err)
699 pr_err("Failed to setup Intel HID switches\n");
700 else
701 report_tablet_mode_state(device);
702 }
703
704 status = acpi_install_notify_handler(handle,
705 ACPI_DEVICE_NOTIFY,
706 notify_handler,
707 device);
708 if (ACPI_FAILURE(status))
709 return -EBUSY;
710
711 err = intel_hid_set_enable(&device->dev, true);
712 if (err)
713 goto err_remove_notify;
714
715 intel_button_array_enable(&device->dev, true);
716
717 /*
718 * Call button load method to enable HID power button
719 * Always do this since it activates events on some devices without
720 * a button array too.
721 */
722 if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_BTNL_FN, &dummy))
723 dev_warn(&device->dev, "failed to enable HID power button\n");
724
725 device_init_wakeup(&device->dev, true);
726 /*
727 * In order for system wakeup to work, the EC GPE has to be marked as
728 * a wakeup one, so do that here (this setting will persist, but it has
729 * no effect until the wakeup mask is set for the EC GPE).
730 */
731 acpi_ec_mark_gpe_for_wake();
732 return 0;
733
734err_remove_notify:
735 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
736
737 return err;
738}
739
740static void intel_hid_remove(struct platform_device *device)
741{
742 acpi_handle handle = ACPI_HANDLE(&device->dev);
743
744 device_init_wakeup(&device->dev, false);
745 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
746 intel_hid_set_enable(&device->dev, false);
747 intel_button_array_enable(&device->dev, false);
748}
749
750static struct platform_driver intel_hid_pl_driver = {
751 .driver = {
752 .name = "intel-hid",
753 .acpi_match_table = intel_hid_ids,
754 .pm = &intel_hid_pl_pm_ops,
755 },
756 .probe = intel_hid_probe,
757 .remove = intel_hid_remove,
758};
759
760/*
761 * Unfortunately, some laptops provide a _HID="INT33D5" device with
762 * _CID="PNP0C02". This causes the pnpacpi scan driver to claim the
763 * ACPI node, so no platform device will be created. The pnpacpi
764 * driver rejects this device in subsequent processing, so no physical
765 * node is created at all.
766 *
767 * As a workaround until the ACPI core figures out how to handle
768 * this corner case, manually ask the ACPI platform device code to
769 * claim the ACPI node.
770 */
771static acpi_status __init
772check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
773{
774 const struct acpi_device_id *ids = context;
775 struct acpi_device *dev = acpi_fetch_acpi_dev(handle);
776
777 if (dev && acpi_match_device_ids(dev, ids) == 0)
778 if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL)))
779 dev_info(&dev->dev,
780 "intel-hid: created platform device\n");
781
782 return AE_OK;
783}
784
785static int __init intel_hid_init(void)
786{
787 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
788 ACPI_UINT32_MAX, check_acpi_dev, NULL,
789 (void *)intel_hid_ids, NULL);
790
791 return platform_driver_register(&intel_hid_pl_driver);
792}
793module_init(intel_hid_init);
794
795static void __exit intel_hid_exit(void)
796{
797 platform_driver_unregister(&intel_hid_pl_driver);
798}
799module_exit(intel_hid_exit);