xref: /openbmc/linux/drivers/platform/x86/intel/hid.c (revision 7783e97f)
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 enum 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 
26 static bool enable_5_button_array;
27 module_param(enable_5_button_array, bool, 0444);
28 MODULE_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 
32 static int enable_sw_tablet_mode = TABLET_SW_AUTO;
33 module_param(enable_sw_tablet_mode, int, 0444);
34 MODULE_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 
41 MODULE_LICENSE("GPL");
42 MODULE_AUTHOR("Alex Hung");
43 
44 static 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 };
54 MODULE_DEVICE_TABLE(acpi, intel_hid_ids);
55 
56 /* In theory, these are HID usages. */
57 static 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. */
81 static 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 
95 static 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  */
140 static 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  */
166 static 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 
180 struct 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 
189 enum 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 
203 static 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 
216 static unsigned long long intel_hid_dsm_fn_mask;
217 static guid_t intel_dsm_guid;
218 
intel_hid_execute_method(acpi_handle handle,enum intel_hid_dsm_fn_codes fn_index,unsigned long long arg)219 static 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 
252 skip_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 
intel_hid_evaluate_method(acpi_handle handle,enum intel_hid_dsm_fn_codes fn_index,unsigned long long * result)260 static 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 
289 skip_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 
intel_hid_init_dsm(acpi_handle handle)297 static 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 
intel_hid_set_enable(struct device * device,bool enable)326 static 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 
intel_button_array_enable(struct device * device,bool enable)341 static 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 
intel_hid_pm_prepare(struct device * device)364 static 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 
intel_hid_pm_complete(struct device * device)374 static 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 
intel_hid_pl_suspend_handler(struct device * device)381 static 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 
intel_hid_pl_resume_handler(struct device * device)391 static 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 
402 static 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 
intel_hid_input_setup(struct platform_device * device)412 static 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 
intel_button_array_input_setup(struct platform_device * device)431 static 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 
intel_hid_switches_setup(struct platform_device * device)451 static 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 
report_tablet_mode_state(struct platform_device * device)468 static 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 
report_tablet_mode_event(struct input_dev * input_dev,u32 event)483 static 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 
notify_handler(acpi_handle handle,u32 event,void * context)502 static 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 
553 wakeup:
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 
button_array_present(struct platform_device * device)602 static 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 
intel_hid_probe(struct platform_device * device)626 static 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 
720 err_remove_notify:
721 	acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
722 
723 	return err;
724 }
725 
intel_hid_remove(struct platform_device * device)726 static 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 
736 static 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  */
757 static acpi_status __init
check_acpi_dev(acpi_handle handle,u32 lvl,void * context,void ** rv)758 check_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 
intel_hid_init(void)771 static 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 }
779 module_init(intel_hid_init);
780 
intel_hid_exit(void)781 static void __exit intel_hid_exit(void)
782 {
783 	platform_driver_unregister(&intel_hid_pl_driver);
784 }
785 module_exit(intel_hid_exit);
786