1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Supports for the button array on SoC tablets originally running
4  * Windows 8.
5  *
6  * (C) Copyright 2014 Intel Corporation
7  */
8 
9 #include <linux/module.h>
10 #include <linux/input.h>
11 #include <linux/init.h>
12 #include <linux/irq.h>
13 #include <linux/kernel.h>
14 #include <linux/acpi.h>
15 #include <linux/dmi.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/gpio_keys.h>
18 #include <linux/gpio.h>
19 #include <linux/platform_device.h>
20 
21 static bool use_low_level_irq;
22 module_param(use_low_level_irq, bool, 0444);
23 MODULE_PARM_DESC(use_low_level_irq, "Use low-level triggered IRQ instead of edge triggered");
24 
25 struct soc_button_info {
26 	const char *name;
27 	int acpi_index;
28 	unsigned int event_type;
29 	unsigned int event_code;
30 	bool autorepeat;
31 	bool wakeup;
32 	bool active_low;
33 };
34 
35 struct soc_device_data {
36 	const struct soc_button_info *button_info;
37 	int (*check)(struct device *dev);
38 };
39 
40 /*
41  * Some of the buttons like volume up/down are auto repeat, while others
42  * are not. To support both, we register two platform devices, and put
43  * buttons into them based on whether the key should be auto repeat.
44  */
45 #define BUTTON_TYPES	2
46 
47 struct soc_button_data {
48 	struct platform_device *children[BUTTON_TYPES];
49 };
50 
51 /*
52  * Some 2-in-1s which use the soc_button_array driver have this ugly issue in
53  * their DSDT where the _LID method modifies the irq-type settings of the GPIOs
54  * used for the power and home buttons. The intend of this AML code is to
55  * disable these buttons when the lid is closed.
56  * The AML does this by directly poking the GPIO controllers registers. This is
57  * problematic because when re-enabling the irq, which happens whenever _LID
58  * gets called with the lid open (e.g. on boot and on resume), it sets the
59  * irq-type to IRQ_TYPE_LEVEL_LOW. Where as the gpio-keys driver programs the
60  * type to, and expects it to be, IRQ_TYPE_EDGE_BOTH.
61  * To work around this we don't set gpio_keys_button.gpio on these 2-in-1s,
62  * instead we get the irq for the GPIO ourselves, configure it as
63  * IRQ_TYPE_LEVEL_LOW (to match how the _LID AML code configures it) and pass
64  * the irq in gpio_keys_button.irq. Below is a list of affected devices.
65  */
66 static const struct dmi_system_id dmi_use_low_level_irq[] = {
67 	{
68 		/*
69 		 * Acer Switch 10 SW5-012. _LID method messes with home- and
70 		 * power-button GPIO IRQ settings. When (re-)enabling the irq
71 		 * it ors in its own flags without clearing the previous set
72 		 * ones, leading to an irq-type of IRQ_TYPE_LEVEL_LOW |
73 		 * IRQ_TYPE_LEVEL_HIGH causing a continuous interrupt storm.
74 		 */
75 		.matches = {
76 			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
77 			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire SW5-012"),
78 		},
79 	},
80 	{
81 		/* Acer Switch V 10 SW5-017, same issue as Acer Switch 10 SW5-012. */
82 		.matches = {
83 			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
84 			DMI_MATCH(DMI_PRODUCT_NAME, "SW5-017"),
85 		},
86 	},
87 	{
88 		/*
89 		 * Acer One S1003. _LID method messes with power-button GPIO
90 		 * IRQ settings, leading to a non working power-button.
91 		 */
92 		.matches = {
93 			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
94 			DMI_MATCH(DMI_PRODUCT_NAME, "One S1003"),
95 		},
96 	},
97 	{
98 		/*
99 		 * Lenovo Yoga Tab2 1051F/1051L, something messes with the home-button
100 		 * IRQ settings, leading to a non working home-button.
101 		 */
102 		.matches = {
103 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
104 			DMI_MATCH(DMI_PRODUCT_NAME, "60073"),
105 			DMI_MATCH(DMI_PRODUCT_VERSION, "1051"),
106 		},
107 	},
108 	{} /* Terminating entry */
109 };
110 
111 /*
112  * Some devices have a wrong entry which points to a GPIO which is
113  * required in another driver, so this driver must not claim it.
114  */
115 static const struct dmi_system_id dmi_invalid_acpi_index[] = {
116 	{
117 		/*
118 		 * Lenovo Yoga Book X90F / X90L, the PNP0C40 home button entry
119 		 * points to a GPIO which is not a home button and which is
120 		 * required by the lenovo-yogabook driver.
121 		 */
122 		.matches = {
123 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
124 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
125 			DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"),
126 		},
127 		.driver_data = (void *)1l,
128 	},
129 	{} /* Terminating entry */
130 };
131 
132 /*
133  * Get the Nth GPIO number from the ACPI object.
134  */
135 static int soc_button_lookup_gpio(struct device *dev, int acpi_index,
136 				  int *gpio_ret, int *irq_ret)
137 {
138 	struct gpio_desc *desc;
139 
140 	desc = gpiod_get_index(dev, NULL, acpi_index, GPIOD_ASIS);
141 	if (IS_ERR(desc))
142 		return PTR_ERR(desc);
143 
144 	*gpio_ret = desc_to_gpio(desc);
145 	*irq_ret = gpiod_to_irq(desc);
146 
147 	gpiod_put(desc);
148 
149 	return 0;
150 }
151 
152 static struct platform_device *
153 soc_button_device_create(struct platform_device *pdev,
154 			 const struct soc_button_info *button_info,
155 			 bool autorepeat)
156 {
157 	const struct soc_button_info *info;
158 	struct platform_device *pd;
159 	struct gpio_keys_button *gpio_keys;
160 	struct gpio_keys_platform_data *gpio_keys_pdata;
161 	const struct dmi_system_id *dmi_id;
162 	int invalid_acpi_index = -1;
163 	int error, gpio, irq;
164 	int n_buttons = 0;
165 
166 	for (info = button_info; info->name; info++)
167 		if (info->autorepeat == autorepeat)
168 			n_buttons++;
169 
170 	gpio_keys_pdata = devm_kzalloc(&pdev->dev,
171 				       sizeof(*gpio_keys_pdata) +
172 					sizeof(*gpio_keys) * n_buttons,
173 				       GFP_KERNEL);
174 	if (!gpio_keys_pdata)
175 		return ERR_PTR(-ENOMEM);
176 
177 	gpio_keys = (void *)(gpio_keys_pdata + 1);
178 	n_buttons = 0;
179 
180 	dmi_id = dmi_first_match(dmi_invalid_acpi_index);
181 	if (dmi_id)
182 		invalid_acpi_index = (long)dmi_id->driver_data;
183 
184 	for (info = button_info; info->name; info++) {
185 		if (info->autorepeat != autorepeat)
186 			continue;
187 
188 		if (info->acpi_index == invalid_acpi_index)
189 			continue;
190 
191 		error = soc_button_lookup_gpio(&pdev->dev, info->acpi_index, &gpio, &irq);
192 		if (error || irq < 0) {
193 			/*
194 			 * Skip GPIO if not present. Note we deliberately
195 			 * ignore -EPROBE_DEFER errors here. On some devices
196 			 * Intel is using so called virtual GPIOs which are not
197 			 * GPIOs at all but some way for AML code to check some
198 			 * random status bits without need a custom opregion.
199 			 * In some cases the resources table we parse points to
200 			 * such a virtual GPIO, since these are not real GPIOs
201 			 * we do not have a driver for these so they will never
202 			 * show up, therefore we ignore -EPROBE_DEFER.
203 			 */
204 			continue;
205 		}
206 
207 		/* See dmi_use_low_level_irq[] comment */
208 		if (!autorepeat && (use_low_level_irq ||
209 				    dmi_check_system(dmi_use_low_level_irq))) {
210 			irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW);
211 			gpio_keys[n_buttons].irq = irq;
212 			gpio_keys[n_buttons].gpio = -ENOENT;
213 		} else {
214 			gpio_keys[n_buttons].gpio = gpio;
215 		}
216 
217 		gpio_keys[n_buttons].type = info->event_type;
218 		gpio_keys[n_buttons].code = info->event_code;
219 		gpio_keys[n_buttons].active_low = info->active_low;
220 		gpio_keys[n_buttons].desc = info->name;
221 		gpio_keys[n_buttons].wakeup = info->wakeup;
222 		/* These devices often use cheap buttons, use 50 ms debounce */
223 		gpio_keys[n_buttons].debounce_interval = 50;
224 		n_buttons++;
225 	}
226 
227 	if (n_buttons == 0) {
228 		error = -ENODEV;
229 		goto err_free_mem;
230 	}
231 
232 	gpio_keys_pdata->buttons = gpio_keys;
233 	gpio_keys_pdata->nbuttons = n_buttons;
234 	gpio_keys_pdata->rep = autorepeat;
235 
236 	pd = platform_device_register_resndata(&pdev->dev, "gpio-keys",
237 					       PLATFORM_DEVID_AUTO, NULL, 0,
238 					       gpio_keys_pdata,
239 					       sizeof(*gpio_keys_pdata));
240 	error = PTR_ERR_OR_ZERO(pd);
241 	if (error) {
242 		dev_err(&pdev->dev,
243 			"failed registering gpio-keys: %d\n", error);
244 		goto err_free_mem;
245 	}
246 
247 	return pd;
248 
249 err_free_mem:
250 	devm_kfree(&pdev->dev, gpio_keys_pdata);
251 	return ERR_PTR(error);
252 }
253 
254 static int soc_button_get_acpi_object_int(const union acpi_object *obj)
255 {
256 	if (obj->type != ACPI_TYPE_INTEGER)
257 		return -1;
258 
259 	return obj->integer.value;
260 }
261 
262 /* Parse a single ACPI0011 _DSD button descriptor */
263 static int soc_button_parse_btn_desc(struct device *dev,
264 				     const union acpi_object *desc,
265 				     int collection_uid,
266 				     struct soc_button_info *info)
267 {
268 	int upage, usage;
269 
270 	if (desc->type != ACPI_TYPE_PACKAGE ||
271 	    desc->package.count != 5 ||
272 	    /* First byte should be 1 (control) */
273 	    soc_button_get_acpi_object_int(&desc->package.elements[0]) != 1 ||
274 	    /* Third byte should be collection uid */
275 	    soc_button_get_acpi_object_int(&desc->package.elements[2]) !=
276 							    collection_uid) {
277 		dev_err(dev, "Invalid ACPI Button Descriptor\n");
278 		return -ENODEV;
279 	}
280 
281 	info->event_type = EV_KEY;
282 	info->active_low = true;
283 	info->acpi_index =
284 		soc_button_get_acpi_object_int(&desc->package.elements[1]);
285 	upage = soc_button_get_acpi_object_int(&desc->package.elements[3]);
286 	usage = soc_button_get_acpi_object_int(&desc->package.elements[4]);
287 
288 	/*
289 	 * The UUID: fa6bd625-9ce8-470d-a2c7-b3ca36c4282e descriptors use HID
290 	 * usage page and usage codes, but otherwise the device is not HID
291 	 * compliant: it uses one irq per button instead of generating HID
292 	 * input reports and some buttons should generate wakeups where as
293 	 * others should not, so we cannot use the HID subsystem.
294 	 *
295 	 * Luckily all devices only use a few usage page + usage combinations,
296 	 * so we can simply check for the known combinations here.
297 	 */
298 	if (upage == 0x01 && usage == 0x81) {
299 		info->name = "power";
300 		info->event_code = KEY_POWER;
301 		info->wakeup = true;
302 	} else if (upage == 0x01 && usage == 0xc6) {
303 		info->name = "airplane mode switch";
304 		info->event_type = EV_SW;
305 		info->event_code = SW_RFKILL_ALL;
306 		info->active_low = false;
307 	} else if (upage == 0x01 && usage == 0xca) {
308 		info->name = "rotation lock switch";
309 		info->event_type = EV_SW;
310 		info->event_code = SW_ROTATE_LOCK;
311 	} else if (upage == 0x07 && usage == 0xe3) {
312 		info->name = "home";
313 		info->event_code = KEY_LEFTMETA;
314 		info->wakeup = true;
315 	} else if (upage == 0x0c && usage == 0xe9) {
316 		info->name = "volume_up";
317 		info->event_code = KEY_VOLUMEUP;
318 		info->autorepeat = true;
319 	} else if (upage == 0x0c && usage == 0xea) {
320 		info->name = "volume_down";
321 		info->event_code = KEY_VOLUMEDOWN;
322 		info->autorepeat = true;
323 	} else {
324 		dev_warn(dev, "Unknown button index %d upage %02x usage %02x, ignoring\n",
325 			 info->acpi_index, upage, usage);
326 		info->name = "unknown";
327 		info->event_code = KEY_RESERVED;
328 	}
329 
330 	return 0;
331 }
332 
333 /* ACPI0011 _DSD btns descriptors UUID: fa6bd625-9ce8-470d-a2c7-b3ca36c4282e */
334 static const u8 btns_desc_uuid[16] = {
335 	0x25, 0xd6, 0x6b, 0xfa, 0xe8, 0x9c, 0x0d, 0x47,
336 	0xa2, 0xc7, 0xb3, 0xca, 0x36, 0xc4, 0x28, 0x2e
337 };
338 
339 /* Parse ACPI0011 _DSD button descriptors */
340 static struct soc_button_info *soc_button_get_button_info(struct device *dev)
341 {
342 	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
343 	const union acpi_object *desc, *el0, *uuid, *btns_desc = NULL;
344 	struct soc_button_info *button_info;
345 	acpi_status status;
346 	int i, btn, collection_uid = -1;
347 
348 	status = acpi_evaluate_object_typed(ACPI_HANDLE(dev), "_DSD", NULL,
349 					    &buf, ACPI_TYPE_PACKAGE);
350 	if (ACPI_FAILURE(status)) {
351 		dev_err(dev, "ACPI _DSD object not found\n");
352 		return ERR_PTR(-ENODEV);
353 	}
354 
355 	/* Look for the Button Descriptors UUID */
356 	desc = buf.pointer;
357 	for (i = 0; (i + 1) < desc->package.count; i += 2) {
358 		uuid = &desc->package.elements[i];
359 
360 		if (uuid->type != ACPI_TYPE_BUFFER ||
361 		    uuid->buffer.length != 16 ||
362 		    desc->package.elements[i + 1].type != ACPI_TYPE_PACKAGE) {
363 			break;
364 		}
365 
366 		if (memcmp(uuid->buffer.pointer, btns_desc_uuid, 16) == 0) {
367 			btns_desc = &desc->package.elements[i + 1];
368 			break;
369 		}
370 	}
371 
372 	if (!btns_desc) {
373 		dev_err(dev, "ACPI Button Descriptors not found\n");
374 		button_info = ERR_PTR(-ENODEV);
375 		goto out;
376 	}
377 
378 	/* The first package describes the collection */
379 	el0 = &btns_desc->package.elements[0];
380 	if (el0->type == ACPI_TYPE_PACKAGE &&
381 	    el0->package.count == 5 &&
382 	    /* First byte should be 0 (collection) */
383 	    soc_button_get_acpi_object_int(&el0->package.elements[0]) == 0 &&
384 	    /* Third byte should be 0 (top level collection) */
385 	    soc_button_get_acpi_object_int(&el0->package.elements[2]) == 0) {
386 		collection_uid = soc_button_get_acpi_object_int(
387 						&el0->package.elements[1]);
388 	}
389 	if (collection_uid == -1) {
390 		dev_err(dev, "Invalid Button Collection Descriptor\n");
391 		button_info = ERR_PTR(-ENODEV);
392 		goto out;
393 	}
394 
395 	/* There are package.count - 1 buttons + 1 terminating empty entry */
396 	button_info = devm_kcalloc(dev, btns_desc->package.count,
397 				   sizeof(*button_info), GFP_KERNEL);
398 	if (!button_info) {
399 		button_info = ERR_PTR(-ENOMEM);
400 		goto out;
401 	}
402 
403 	/* Parse the button descriptors */
404 	for (i = 1, btn = 0; i < btns_desc->package.count; i++, btn++) {
405 		if (soc_button_parse_btn_desc(dev,
406 					      &btns_desc->package.elements[i],
407 					      collection_uid,
408 					      &button_info[btn])) {
409 			button_info = ERR_PTR(-ENODEV);
410 			goto out;
411 		}
412 	}
413 
414 out:
415 	kfree(buf.pointer);
416 	return button_info;
417 }
418 
419 static int soc_button_remove(struct platform_device *pdev)
420 {
421 	struct soc_button_data *priv = platform_get_drvdata(pdev);
422 
423 	int i;
424 
425 	for (i = 0; i < BUTTON_TYPES; i++)
426 		if (priv->children[i])
427 			platform_device_unregister(priv->children[i]);
428 
429 	return 0;
430 }
431 
432 static int soc_button_probe(struct platform_device *pdev)
433 {
434 	struct device *dev = &pdev->dev;
435 	const struct soc_device_data *device_data;
436 	const struct soc_button_info *button_info;
437 	struct soc_button_data *priv;
438 	struct platform_device *pd;
439 	int i;
440 	int error;
441 
442 	device_data = acpi_device_get_match_data(dev);
443 	if (device_data && device_data->check) {
444 		error = device_data->check(dev);
445 		if (error)
446 			return error;
447 	}
448 
449 	if (device_data && device_data->button_info) {
450 		button_info = device_data->button_info;
451 	} else {
452 		button_info = soc_button_get_button_info(dev);
453 		if (IS_ERR(button_info))
454 			return PTR_ERR(button_info);
455 	}
456 
457 	error = gpiod_count(dev, NULL);
458 	if (error < 0) {
459 		dev_dbg(dev, "no GPIO attached, ignoring...\n");
460 		return -ENODEV;
461 	}
462 
463 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
464 	if (!priv)
465 		return -ENOMEM;
466 
467 	platform_set_drvdata(pdev, priv);
468 
469 	for (i = 0; i < BUTTON_TYPES; i++) {
470 		pd = soc_button_device_create(pdev, button_info, i == 0);
471 		if (IS_ERR(pd)) {
472 			error = PTR_ERR(pd);
473 			if (error != -ENODEV) {
474 				soc_button_remove(pdev);
475 				return error;
476 			}
477 			continue;
478 		}
479 
480 		priv->children[i] = pd;
481 	}
482 
483 	if (!priv->children[0] && !priv->children[1])
484 		return -ENODEV;
485 
486 	if (!device_data || !device_data->button_info)
487 		devm_kfree(dev, button_info);
488 
489 	return 0;
490 }
491 
492 /*
493  * Definition of buttons on the tablet. The ACPI index of each button
494  * is defined in section 2.8.7.2 of "Windows ACPI Design Guide for SoC
495  * Platforms"
496  */
497 static const struct soc_button_info soc_button_PNP0C40[] = {
498 	{ "power", 0, EV_KEY, KEY_POWER, false, true, true },
499 	{ "home", 1, EV_KEY, KEY_LEFTMETA, false, true, true },
500 	{ "volume_up", 2, EV_KEY, KEY_VOLUMEUP, true, false, true },
501 	{ "volume_down", 3, EV_KEY, KEY_VOLUMEDOWN, true, false, true },
502 	{ "rotation_lock", 4, EV_KEY, KEY_ROTATE_LOCK_TOGGLE, false, false, true },
503 	{ }
504 };
505 
506 static const struct soc_device_data soc_device_PNP0C40 = {
507 	.button_info = soc_button_PNP0C40,
508 };
509 
510 static const struct soc_button_info soc_button_INT33D3[] = {
511 	{ "tablet_mode", 0, EV_SW, SW_TABLET_MODE, false, false, false },
512 	{ }
513 };
514 
515 static const struct soc_device_data soc_device_INT33D3 = {
516 	.button_info = soc_button_INT33D3,
517 };
518 
519 /*
520  * Button info for Microsoft Surface 3 (non pro), this is indentical to
521  * the PNP0C40 info except that the home button is active-high.
522  *
523  * The Surface 3 Pro also has a MSHW0028 ACPI device, but that uses a custom
524  * version of the drivers/platform/x86/intel/hid.c 5 button array ACPI API
525  * instead. A check() callback is not necessary though as the Surface 3 Pro
526  * MSHW0028 ACPI device's resource table does not contain any GPIOs.
527  */
528 static const struct soc_button_info soc_button_MSHW0028[] = {
529 	{ "power", 0, EV_KEY, KEY_POWER, false, true, true },
530 	{ "home", 1, EV_KEY, KEY_LEFTMETA, false, true, false },
531 	{ "volume_up", 2, EV_KEY, KEY_VOLUMEUP, true, false, true },
532 	{ "volume_down", 3, EV_KEY, KEY_VOLUMEDOWN, true, false, true },
533 	{ }
534 };
535 
536 static const struct soc_device_data soc_device_MSHW0028 = {
537 	.button_info = soc_button_MSHW0028,
538 };
539 
540 /*
541  * Special device check for Surface Book 2 and Surface Pro (2017).
542  * Both, the Surface Pro 4 (surfacepro3_button.c) and the above mentioned
543  * devices use MSHW0040 for power and volume buttons, however the way they
544  * have to be addressed differs. Make sure that we only load this drivers
545  * for the correct devices by checking the OEM Platform Revision provided by
546  * the _DSM method.
547  */
548 #define MSHW0040_DSM_REVISION		0x01
549 #define MSHW0040_DSM_GET_OMPR		0x02	// get OEM Platform Revision
550 static const guid_t MSHW0040_DSM_UUID =
551 	GUID_INIT(0x6fd05c69, 0xcde3, 0x49f4, 0x95, 0xed, 0xab, 0x16, 0x65,
552 		  0x49, 0x80, 0x35);
553 
554 static int soc_device_check_MSHW0040(struct device *dev)
555 {
556 	acpi_handle handle = ACPI_HANDLE(dev);
557 	union acpi_object *result;
558 	u64 oem_platform_rev = 0;	// valid revisions are nonzero
559 
560 	// get OEM platform revision
561 	result = acpi_evaluate_dsm_typed(handle, &MSHW0040_DSM_UUID,
562 					 MSHW0040_DSM_REVISION,
563 					 MSHW0040_DSM_GET_OMPR, NULL,
564 					 ACPI_TYPE_INTEGER);
565 
566 	if (result) {
567 		oem_platform_rev = result->integer.value;
568 		ACPI_FREE(result);
569 	}
570 
571 	/*
572 	 * If the revision is zero here, the _DSM evaluation has failed. This
573 	 * indicates that we have a Pro 4 or Book 1 and this driver should not
574 	 * be used.
575 	 */
576 	if (oem_platform_rev == 0)
577 		return -ENODEV;
578 
579 	dev_dbg(dev, "OEM Platform Revision %llu\n", oem_platform_rev);
580 
581 	return 0;
582 }
583 
584 /*
585  * Button infos for Microsoft Surface Book 2 and Surface Pro (2017).
586  * Obtained from DSDT/testing.
587  */
588 static const struct soc_button_info soc_button_MSHW0040[] = {
589 	{ "power", 0, EV_KEY, KEY_POWER, false, true, true },
590 	{ "volume_up", 2, EV_KEY, KEY_VOLUMEUP, true, false, true },
591 	{ "volume_down", 4, EV_KEY, KEY_VOLUMEDOWN, true, false, true },
592 	{ }
593 };
594 
595 static const struct soc_device_data soc_device_MSHW0040 = {
596 	.button_info = soc_button_MSHW0040,
597 	.check = soc_device_check_MSHW0040,
598 };
599 
600 static const struct acpi_device_id soc_button_acpi_match[] = {
601 	{ "PNP0C40", (unsigned long)&soc_device_PNP0C40 },
602 	{ "INT33D3", (unsigned long)&soc_device_INT33D3 },
603 	{ "ID9001", (unsigned long)&soc_device_INT33D3 },
604 	{ "ACPI0011", 0 },
605 
606 	/* Microsoft Surface Devices (3th, 5th and 6th generation) */
607 	{ "MSHW0028", (unsigned long)&soc_device_MSHW0028 },
608 	{ "MSHW0040", (unsigned long)&soc_device_MSHW0040 },
609 
610 	{ }
611 };
612 
613 MODULE_DEVICE_TABLE(acpi, soc_button_acpi_match);
614 
615 static struct platform_driver soc_button_driver = {
616 	.probe          = soc_button_probe,
617 	.remove		= soc_button_remove,
618 	.driver		= {
619 		.name = KBUILD_MODNAME,
620 		.acpi_match_table = ACPI_PTR(soc_button_acpi_match),
621 	},
622 };
623 module_platform_driver(soc_button_driver);
624 
625 MODULE_LICENSE("GPL");
626