drivers/platform/surface/surface_gpe.c

   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 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 Studio",
 176                 .matches = {
 177                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 178                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop Studio"),
 179                 },
 180                 .driver_data = (void *)lid_device_props_l4B,
 181         },
 182         { }
 183 };
 184
 185 struct surface_lid_device {
 186         u32 gpe_number;
 187 };
 188
 189 static int surface_lid_enable_wakeup(struct device *dev, bool enable)
 190 {
 191         const struct surface_lid_device *lid = dev_get_drvdata(dev);
 192         int action = enable ? ACPI_GPE_ENABLE : ACPI_GPE_DISABLE;
 193         acpi_status status;
 194
 195         status = acpi_set_gpe_wake_mask(NULL, lid->gpe_number, action);
 196         if (ACPI_FAILURE(status)) {
 197                 dev_err(dev, "failed to set GPE wake mask: %s\n",
 198                         acpi_format_exception(status));
 199                 return -EINVAL;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int __maybe_unused surface_gpe_suspend(struct device *dev)
 206 {
 207         return surface_lid_enable_wakeup(dev, true);
 208 }
 209
 210 static int __maybe_unused surface_gpe_resume(struct device *dev)
 211 {
 212         return surface_lid_enable_wakeup(dev, false);
 213 }
 214
 215 static SIMPLE_DEV_PM_OPS(surface_gpe_pm, surface_gpe_suspend, surface_gpe_resume);
 216
 217 static int surface_gpe_probe(struct platform_device *pdev)
 218 {
 219         struct surface_lid_device *lid;
 220         u32 gpe_number;
 221         acpi_status status;
 222         int ret;
 223
 224         ret = device_property_read_u32(&pdev->dev, "gpe", &gpe_number);
 225         if (ret) {
 226                 dev_err(&pdev->dev, "failed to read 'gpe' property: %d\n", ret);
 227                 return ret;
 228         }
 229
 230         lid = devm_kzalloc(&pdev->dev, sizeof(*lid), GFP_KERNEL);
 231         if (!lid)
 232                 return -ENOMEM;
 233
 234         lid->gpe_number = gpe_number;
 235         platform_set_drvdata(pdev, lid);
 236
 237         status = acpi_mark_gpe_for_wake(NULL, gpe_number);
 238         if (ACPI_FAILURE(status)) {
 239                 dev_err(&pdev->dev, "failed to mark GPE for wake: %s\n",
 240                         acpi_format_exception(status));
 241                 return -EINVAL;
 242         }
 243
 244         status = acpi_enable_gpe(NULL, gpe_number);
 245         if (ACPI_FAILURE(status)) {
 246                 dev_err(&pdev->dev, "failed to enable GPE: %s\n",
 247                         acpi_format_exception(status));
 248                 return -EINVAL;
 249         }
 250
 251         ret = surface_lid_enable_wakeup(&pdev->dev, false);
 252         if (ret)
 253                 acpi_disable_gpe(NULL, gpe_number);
 254
 255         return ret;
 256 }
 257
 258 static int surface_gpe_remove(struct platform_device *pdev)
 259 {
 260         struct surface_lid_device *lid = dev_get_drvdata(&pdev->dev);
 261
 262         /* restore default behavior without this module */
 263         surface_lid_enable_wakeup(&pdev->dev, false);
 264         acpi_disable_gpe(NULL, lid->gpe_number);
 265
 266         return 0;
 267 }
 268
 269 static struct platform_driver surface_gpe_driver = {
 270         .probe = surface_gpe_probe,
 271         .remove = surface_gpe_remove,
 272         .driver = {
 273                 .name = "surface_gpe",
 274                 .pm = &surface_gpe_pm,
 275                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 276         },
 277 };
 278
 279 static struct platform_device *surface_gpe_device;
 280
 281 static int __init surface_gpe_init(void)
 282 {
 283         const struct dmi_system_id *match;
 284         struct platform_device *pdev;
 285         struct fwnode_handle *fwnode;
 286         int status;
 287
 288         match = dmi_first_match(dmi_lid_device_table);
 289         if (!match) {
 290                 pr_info("no compatible Microsoft Surface device found, exiting\n");
 291                 return -ENODEV;
 292         }
 293
 294         status = platform_driver_register(&surface_gpe_driver);
 295         if (status)
 296                 return status;
 297
 298         fwnode = fwnode_create_software_node(match->driver_data, NULL);
 299         if (IS_ERR(fwnode)) {
 300                 status = PTR_ERR(fwnode);
 301                 goto err_node;
 302         }
 303
 304         pdev = platform_device_alloc("surface_gpe", PLATFORM_DEVID_NONE);
 305         if (!pdev) {
 306                 status = -ENOMEM;
 307                 goto err_alloc;
 308         }
 309
 310         pdev->dev.fwnode = fwnode;
 311
 312         status = platform_device_add(pdev);
 313         if (status)
 314                 goto err_add;
 315
 316         surface_gpe_device = pdev;
 317         return 0;
 318
 319 err_add:
 320         platform_device_put(pdev);
 321 err_alloc:
 322         fwnode_remove_software_node(fwnode);
 323 err_node:
 324         platform_driver_unregister(&surface_gpe_driver);
 325         return status;
 326 }
 327 module_init(surface_gpe_init);
 328
 329 static void __exit surface_gpe_exit(void)
 330 {
 331         struct fwnode_handle *fwnode = surface_gpe_device->dev.fwnode;
 332
 333         platform_device_unregister(surface_gpe_device);
 334         platform_driver_unregister(&surface_gpe_driver);
 335         fwnode_remove_software_node(fwnode);
 336 }
 337 module_exit(surface_gpe_exit);
 338
 339 MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
 340 MODULE_DESCRIPTION("Surface GPE/Lid Driver");
 341 MODULE_LICENSE("GPL");
 342 MODULE_ALIAS("dmi:*:svnMicrosoftCorporation:pnSurface*:*");