1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Surface GPE/Lid driver to enable wakeup from suspend via the lid by
4  * properly configuring the respective GPEs. Required for wakeup via lid on
5  * newer Intel-based Microsoft Surface devices.
6  *
7  * Copyright (C) 2020-2022 Maximilian Luz <luzmaximilian@gmail.com>
8  */
9 
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 
12 #include <linux/acpi.h>
13 #include <linux/dmi.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 
18 /*
19  * Note: The GPE numbers for the lid devices found below have been obtained
20  *       from ACPI/the DSDT table, specifically from the GPE handler for the
21  *       lid.
22  */
23 
24 static const struct property_entry lid_device_props_l17[] = {
25 	PROPERTY_ENTRY_U32("gpe", 0x17),
26 	{},
27 };
28 
29 static const struct property_entry lid_device_props_l4B[] = {
30 	PROPERTY_ENTRY_U32("gpe", 0x4B),
31 	{},
32 };
33 
34 static const struct property_entry lid_device_props_l4D[] = {
35 	PROPERTY_ENTRY_U32("gpe", 0x4D),
36 	{},
37 };
38 
39 static const struct property_entry lid_device_props_l4F[] = {
40 	PROPERTY_ENTRY_U32("gpe", 0x4F),
41 	{},
42 };
43 
44 static const struct property_entry lid_device_props_l57[] = {
45 	PROPERTY_ENTRY_U32("gpe", 0x57),
46 	{},
47 };
48 
49 /*
50  * Note: When changing this, don't forget to check that the MODULE_ALIAS below
51  *       still fits.
52  */
53 static const struct dmi_system_id dmi_lid_device_table[] = {
54 	{
55 		.ident = "Surface Pro 4",
56 		.matches = {
57 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
58 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 4"),
59 		},
60 		.driver_data = (void *)lid_device_props_l17,
61 	},
62 	{
63 		.ident = "Surface Pro 5",
64 		.matches = {
65 			/*
66 			 * We match for SKU here due to generic product name
67 			 * "Surface Pro".
68 			 */
69 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
70 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1796"),
71 		},
72 		.driver_data = (void *)lid_device_props_l4F,
73 	},
74 	{
75 		.ident = "Surface Pro 5 (LTE)",
76 		.matches = {
77 			/*
78 			 * We match for SKU here due to generic product name
79 			 * "Surface Pro"
80 			 */
81 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
82 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1807"),
83 		},
84 		.driver_data = (void *)lid_device_props_l4F,
85 	},
86 	{
87 		.ident = "Surface Pro 6",
88 		.matches = {
89 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
90 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 6"),
91 		},
92 		.driver_data = (void *)lid_device_props_l4F,
93 	},
94 	{
95 		.ident = "Surface Pro 7",
96 		.matches = {
97 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
98 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 7"),
99 		},
100 		.driver_data = (void *)lid_device_props_l4D,
101 	},
102 	{
103 		.ident = "Surface Pro 8",
104 		.matches = {
105 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
106 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 8"),
107 		},
108 		.driver_data = (void *)lid_device_props_l4B,
109 	},
110 	{
111 		.ident = "Surface Book 1",
112 		.matches = {
113 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
114 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book"),
115 		},
116 		.driver_data = (void *)lid_device_props_l17,
117 	},
118 	{
119 		.ident = "Surface Book 2",
120 		.matches = {
121 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
122 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 2"),
123 		},
124 		.driver_data = (void *)lid_device_props_l17,
125 	},
126 	{
127 		.ident = "Surface Book 3",
128 		.matches = {
129 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
130 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 3"),
131 		},
132 		.driver_data = (void *)lid_device_props_l4D,
133 	},
134 	{
135 		.ident = "Surface Laptop 1",
136 		.matches = {
137 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
138 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop"),
139 		},
140 		.driver_data = (void *)lid_device_props_l57,
141 	},
142 	{
143 		.ident = "Surface Laptop 2",
144 		.matches = {
145 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
146 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop 2"),
147 		},
148 		.driver_data = (void *)lid_device_props_l57,
149 	},
150 	{
151 		.ident = "Surface Laptop 3 (Intel 13\")",
152 		.matches = {
153 			/*
154 			 * We match for SKU here due to different variants: The
155 			 * AMD (15") version does not rely on GPEs.
156 			 */
157 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
158 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_3_1867:1868"),
159 		},
160 		.driver_data = (void *)lid_device_props_l4D,
161 	},
162 	{
163 		.ident = "Surface Laptop 3 (Intel 15\")",
164 		.matches = {
165 			/*
166 			 * We match for SKU here due to different variants: The
167 			 * AMD (15") version does not rely on GPEs.
168 			 */
169 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
170 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_3_1872"),
171 		},
172 		.driver_data = (void *)lid_device_props_l4D,
173 	},
174 	{
175 		.ident = "Surface Laptop 4 (Intel 13\")",
176 		.matches = {
177 			/*
178 			 * We match for SKU here due to different variants: The
179 			 * AMD (15") version does not rely on GPEs.
180 			 */
181 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
182 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_4_1950:1951"),
183 		},
184 		.driver_data = (void *)lid_device_props_l4B,
185 	},
186 	{
187 		.ident = "Surface Laptop Studio",
188 		.matches = {
189 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
190 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop Studio"),
191 		},
192 		.driver_data = (void *)lid_device_props_l4B,
193 	},
194 	{ }
195 };
196 
197 struct surface_lid_device {
198 	u32 gpe_number;
199 };
200 
surface_lid_enable_wakeup(struct device * dev,bool enable)201 static int surface_lid_enable_wakeup(struct device *dev, bool enable)
202 {
203 	const struct surface_lid_device *lid = dev_get_drvdata(dev);
204 	int action = enable ? ACPI_GPE_ENABLE : ACPI_GPE_DISABLE;
205 	acpi_status status;
206 
207 	status = acpi_set_gpe_wake_mask(NULL, lid->gpe_number, action);
208 	if (ACPI_FAILURE(status)) {
209 		dev_err(dev, "failed to set GPE wake mask: %s\n",
210 			acpi_format_exception(status));
211 		return -EINVAL;
212 	}
213 
214 	return 0;
215 }
216 
surface_gpe_suspend(struct device * dev)217 static int __maybe_unused surface_gpe_suspend(struct device *dev)
218 {
219 	return surface_lid_enable_wakeup(dev, true);
220 }
221 
surface_gpe_resume(struct device * dev)222 static int __maybe_unused surface_gpe_resume(struct device *dev)
223 {
224 	return surface_lid_enable_wakeup(dev, false);
225 }
226 
227 static SIMPLE_DEV_PM_OPS(surface_gpe_pm, surface_gpe_suspend, surface_gpe_resume);
228 
surface_gpe_probe(struct platform_device * pdev)229 static int surface_gpe_probe(struct platform_device *pdev)
230 {
231 	struct surface_lid_device *lid;
232 	u32 gpe_number;
233 	acpi_status status;
234 	int ret;
235 
236 	ret = device_property_read_u32(&pdev->dev, "gpe", &gpe_number);
237 	if (ret) {
238 		dev_err(&pdev->dev, "failed to read 'gpe' property: %d\n", ret);
239 		return ret;
240 	}
241 
242 	lid = devm_kzalloc(&pdev->dev, sizeof(*lid), GFP_KERNEL);
243 	if (!lid)
244 		return -ENOMEM;
245 
246 	lid->gpe_number = gpe_number;
247 	platform_set_drvdata(pdev, lid);
248 
249 	status = acpi_mark_gpe_for_wake(NULL, gpe_number);
250 	if (ACPI_FAILURE(status)) {
251 		dev_err(&pdev->dev, "failed to mark GPE for wake: %s\n",
252 			acpi_format_exception(status));
253 		return -EINVAL;
254 	}
255 
256 	status = acpi_enable_gpe(NULL, gpe_number);
257 	if (ACPI_FAILURE(status)) {
258 		dev_err(&pdev->dev, "failed to enable GPE: %s\n",
259 			acpi_format_exception(status));
260 		return -EINVAL;
261 	}
262 
263 	ret = surface_lid_enable_wakeup(&pdev->dev, false);
264 	if (ret)
265 		acpi_disable_gpe(NULL, gpe_number);
266 
267 	return ret;
268 }
269 
surface_gpe_remove(struct platform_device * pdev)270 static int surface_gpe_remove(struct platform_device *pdev)
271 {
272 	struct surface_lid_device *lid = dev_get_drvdata(&pdev->dev);
273 
274 	/* restore default behavior without this module */
275 	surface_lid_enable_wakeup(&pdev->dev, false);
276 	acpi_disable_gpe(NULL, lid->gpe_number);
277 
278 	return 0;
279 }
280 
281 static struct platform_driver surface_gpe_driver = {
282 	.probe = surface_gpe_probe,
283 	.remove = surface_gpe_remove,
284 	.driver = {
285 		.name = "surface_gpe",
286 		.pm = &surface_gpe_pm,
287 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
288 	},
289 };
290 
291 static struct platform_device *surface_gpe_device;
292 
surface_gpe_init(void)293 static int __init surface_gpe_init(void)
294 {
295 	const struct dmi_system_id *match;
296 	struct platform_device *pdev;
297 	struct fwnode_handle *fwnode;
298 	int status;
299 
300 	match = dmi_first_match(dmi_lid_device_table);
301 	if (!match) {
302 		pr_info("no compatible Microsoft Surface device found, exiting\n");
303 		return -ENODEV;
304 	}
305 
306 	status = platform_driver_register(&surface_gpe_driver);
307 	if (status)
308 		return status;
309 
310 	fwnode = fwnode_create_software_node(match->driver_data, NULL);
311 	if (IS_ERR(fwnode)) {
312 		status = PTR_ERR(fwnode);
313 		goto err_node;
314 	}
315 
316 	pdev = platform_device_alloc("surface_gpe", PLATFORM_DEVID_NONE);
317 	if (!pdev) {
318 		status = -ENOMEM;
319 		goto err_alloc;
320 	}
321 
322 	pdev->dev.fwnode = fwnode;
323 
324 	status = platform_device_add(pdev);
325 	if (status)
326 		goto err_add;
327 
328 	surface_gpe_device = pdev;
329 	return 0;
330 
331 err_add:
332 	platform_device_put(pdev);
333 err_alloc:
334 	fwnode_remove_software_node(fwnode);
335 err_node:
336 	platform_driver_unregister(&surface_gpe_driver);
337 	return status;
338 }
339 module_init(surface_gpe_init);
340 
surface_gpe_exit(void)341 static void __exit surface_gpe_exit(void)
342 {
343 	struct fwnode_handle *fwnode = surface_gpe_device->dev.fwnode;
344 
345 	platform_device_unregister(surface_gpe_device);
346 	platform_driver_unregister(&surface_gpe_driver);
347 	fwnode_remove_software_node(fwnode);
348 }
349 module_exit(surface_gpe_exit);
350 
351 MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
352 MODULE_DESCRIPTION("Surface GPE/Lid Driver");
353 MODULE_LICENSE("GPL");
354 MODULE_ALIAS("dmi:*:svnMicrosoftCorporation:pnSurface*:*");
355