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_l4D[] = {
  30         PROPERTY_ENTRY_U32("gpe", 0x4D),
  31         {},
  32 };
  33
  34 static const struct property_entry lid_device_props_l4F[] = {
  35         PROPERTY_ENTRY_U32("gpe", 0x4F),
  36         {},
  37 };
  38
  39 static const struct property_entry lid_device_props_l57[] = {
  40         PROPERTY_ENTRY_U32("gpe", 0x57),
  41         {},
  42 };
  43
  44 /*
  45  * Note: When changing this, don't forget to check that the MODULE_ALIAS below
  46  *       still fits.
  47  */
  48 static const struct dmi_system_id dmi_lid_device_table[] = {
  49         {
  50                 .ident = "Surface Pro 4",
  51                 .matches = {
  52                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
  53                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 4"),
  54                 },
  55                 .driver_data = (void *)lid_device_props_l17,
  56         },
  57         {
  58                 .ident = "Surface Pro 5",
  59                 .matches = {
  60                         /*
  61                          * We match for SKU here due to generic product name
  62                          * "Surface Pro".
  63                          */
  64                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
  65                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1796"),
  66                 },
  67                 .driver_data = (void *)lid_device_props_l4F,
  68         },
  69         {
  70                 .ident = "Surface Pro 5 (LTE)",
  71                 .matches = {
  72                         /*
  73                          * We match for SKU here due to generic product name
  74                          * "Surface Pro"
  75                          */
  76                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
  77                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1807"),
  78                 },
  79                 .driver_data = (void *)lid_device_props_l4F,
  80         },
  81         {
  82                 .ident = "Surface Pro 6",
  83                 .matches = {
  84                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
  85                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 6"),
  86                 },
  87                 .driver_data = (void *)lid_device_props_l4F,
  88         },
  89         {
  90                 .ident = "Surface Pro 7",
  91                 .matches = {
  92                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
  93                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 7"),
  94                 },
  95                 .driver_data = (void *)lid_device_props_l4D,
  96         },
  97         {
  98                 .ident = "Surface Book 1",
  99                 .matches = {
 100                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 101                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book"),
 102                 },
 103                 .driver_data = (void *)lid_device_props_l17,
 104         },
 105         {
 106                 .ident = "Surface Book 2",
 107                 .matches = {
 108                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 109                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 2"),
 110                 },
 111                 .driver_data = (void *)lid_device_props_l17,
 112         },
 113         {
 114                 .ident = "Surface Book 3",
 115                 .matches = {
 116                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 117                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 3"),
 118                 },
 119                 .driver_data = (void *)lid_device_props_l4D,
 120         },
 121         {
 122                 .ident = "Surface Laptop 1",
 123                 .matches = {
 124                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 125                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop"),
 126                 },
 127                 .driver_data = (void *)lid_device_props_l57,
 128         },
 129         {
 130                 .ident = "Surface Laptop 2",
 131                 .matches = {
 132                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 133                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop 2"),
 134                 },
 135                 .driver_data = (void *)lid_device_props_l57,
 136         },
 137         {
 138                 .ident = "Surface Laptop 3 (Intel 13\")",
 139                 .matches = {
 140                         /*
 141                          * We match for SKU here due to different variants: The
 142                          * AMD (15") version does not rely on GPEs.
 143                          */
 144                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 145                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_3_1867:1868"),
 146                 },
 147                 .driver_data = (void *)lid_device_props_l4D,
 148         },
 149         {
 150                 .ident = "Surface Laptop 3 (Intel 15\")",
 151                 .matches = {
 152                         /*
 153                          * We match for SKU here due to different variants: The
 154                          * AMD (15") version does not rely on GPEs.
 155                          */
 156                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 157                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_3_1872"),
 158                 },
 159                 .driver_data = (void *)lid_device_props_l4D,
 160         },
 161         { }
 162 };
 163
 164 struct surface_lid_device {
 165         u32 gpe_number;
 166 };
 167
 168 static int surface_lid_enable_wakeup(struct device *dev, bool enable)
 169 {
 170         const struct surface_lid_device *lid = dev_get_drvdata(dev);
 171         int action = enable ? ACPI_GPE_ENABLE : ACPI_GPE_DISABLE;
 172         acpi_status status;
 173
 174         status = acpi_set_gpe_wake_mask(NULL, lid->gpe_number, action);
 175         if (ACPI_FAILURE(status)) {
 176                 dev_err(dev, "failed to set GPE wake mask: %s\n",
 177                         acpi_format_exception(status));
 178                 return -EINVAL;
 179         }
 180
 181         return 0;
 182 }
 183
 184 static int __maybe_unused surface_gpe_suspend(struct device *dev)
 185 {
 186         return surface_lid_enable_wakeup(dev, true);
 187 }
 188
 189 static int __maybe_unused surface_gpe_resume(struct device *dev)
 190 {
 191         return surface_lid_enable_wakeup(dev, false);
 192 }
 193
 194 static SIMPLE_DEV_PM_OPS(surface_gpe_pm, surface_gpe_suspend, surface_gpe_resume);
 195
 196 static int surface_gpe_probe(struct platform_device *pdev)
 197 {
 198         struct surface_lid_device *lid;
 199         u32 gpe_number;
 200         acpi_status status;
 201         int ret;
 202
 203         ret = device_property_read_u32(&pdev->dev, "gpe", &gpe_number);
 204         if (ret) {
 205                 dev_err(&pdev->dev, "failed to read 'gpe' property: %d\n", ret);
 206                 return ret;
 207         }
 208
 209         lid = devm_kzalloc(&pdev->dev, sizeof(*lid), GFP_KERNEL);
 210         if (!lid)
 211                 return -ENOMEM;
 212
 213         lid->gpe_number = gpe_number;
 214         platform_set_drvdata(pdev, lid);
 215
 216         status = acpi_mark_gpe_for_wake(NULL, gpe_number);
 217         if (ACPI_FAILURE(status)) {
 218                 dev_err(&pdev->dev, "failed to mark GPE for wake: %s\n",
 219                         acpi_format_exception(status));
 220                 return -EINVAL;
 221         }
 222
 223         status = acpi_enable_gpe(NULL, gpe_number);
 224         if (ACPI_FAILURE(status)) {
 225                 dev_err(&pdev->dev, "failed to enable GPE: %s\n",
 226                         acpi_format_exception(status));
 227                 return -EINVAL;
 228         }
 229
 230         ret = surface_lid_enable_wakeup(&pdev->dev, false);
 231         if (ret)
 232                 acpi_disable_gpe(NULL, gpe_number);
 233
 234         return ret;
 235 }
 236
 237 static int surface_gpe_remove(struct platform_device *pdev)
 238 {
 239         struct surface_lid_device *lid = dev_get_drvdata(&pdev->dev);
 240
 241         /* restore default behavior without this module */
 242         surface_lid_enable_wakeup(&pdev->dev, false);
 243         acpi_disable_gpe(NULL, lid->gpe_number);
 244
 245         return 0;
 246 }
 247
 248 static struct platform_driver surface_gpe_driver = {
 249         .probe = surface_gpe_probe,
 250         .remove = surface_gpe_remove,
 251         .driver = {
 252                 .name = "surface_gpe",
 253                 .pm = &surface_gpe_pm,
 254                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 255         },
 256 };
 257
 258 static struct platform_device *surface_gpe_device;
 259
 260 static int __init surface_gpe_init(void)
 261 {
 262         const struct dmi_system_id *match;
 263         struct platform_device *pdev;
 264         struct fwnode_handle *fwnode;
 265         int status;
 266
 267         match = dmi_first_match(dmi_lid_device_table);
 268         if (!match) {
 269                 pr_info("no compatible Microsoft Surface device found, exiting\n");
 270                 return -ENODEV;
 271         }
 272
 273         status = platform_driver_register(&surface_gpe_driver);
 274         if (status)
 275                 return status;
 276
 277         fwnode = fwnode_create_software_node(match->driver_data, NULL);
 278         if (IS_ERR(fwnode)) {
 279                 status = PTR_ERR(fwnode);
 280                 goto err_node;
 281         }
 282
 283         pdev = platform_device_alloc("surface_gpe", PLATFORM_DEVID_NONE);
 284         if (!pdev) {
 285                 status = -ENOMEM;
 286                 goto err_alloc;
 287         }
 288
 289         pdev->dev.fwnode = fwnode;
 290
 291         status = platform_device_add(pdev);
 292         if (status)
 293                 goto err_add;
 294
 295         surface_gpe_device = pdev;
 296         return 0;
 297
 298 err_add:
 299         platform_device_put(pdev);
 300 err_alloc:
 301         fwnode_remove_software_node(fwnode);
 302 err_node:
 303         platform_driver_unregister(&surface_gpe_driver);
 304         return status;
 305 }
 306 module_init(surface_gpe_init);
 307
 308 static void __exit surface_gpe_exit(void)
 309 {
 310         struct fwnode_handle *fwnode = surface_gpe_device->dev.fwnode;
 311
 312         platform_device_unregister(surface_gpe_device);
 313         platform_driver_unregister(&surface_gpe_driver);
 314         fwnode_remove_software_node(fwnode);
 315 }
 316 module_exit(surface_gpe_exit);
 317
 318 MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
 319 MODULE_DESCRIPTION("Surface GPE/Lid Driver");
 320 MODULE_LICENSE("GPL");
 321 MODULE_ALIAS("dmi:*:svnMicrosoftCorporation:pnSurface*:*");