drivers/platform/surface/surface_aggregator_registry.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Surface System Aggregator Module (SSAM) client device registry.
   4  *
   5  * Registry for non-platform/non-ACPI SSAM client devices, i.e. devices that
   6  * cannot be auto-detected. Provides device-hubs and performs instantiation
   7  * for these devices.
   8  *
   9  * Copyright (C) 2020-2022 Maximilian Luz <[email protected]>
  10  */
  11
  12 #include <linux/acpi.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/property.h>
  17 #include <linux/types.h>
  18
  19 #include <linux/surface_aggregator/device.h>
  20
  21
  22 /* -- Device registry. ------------------------------------------------------ */
  23
  24 /*
  25  * SSAM device names follow the SSAM module alias, meaning they are prefixed
  26  * with 'ssam:', followed by domain, category, target ID, instance ID, and
  27  * function, each encoded as two-digit hexadecimal, separated by ':'. In other
  28  * words, it follows the scheme
  29  *
  30  *      ssam:dd:cc:tt:ii:ff
  31  *
  32  * Where, 'dd', 'cc', 'tt', 'ii', and 'ff' are the two-digit hexadecimal
  33  * values mentioned above, respectively.
  34  */
  35
  36 /* Root node. */
  37 static const struct software_node ssam_node_root = {
  38         .name = "ssam_platform_hub",
  39 };
  40
  41 /* KIP device hub (connects keyboard cover devices on Surface Pro 8). */
  42 static const struct software_node ssam_node_hub_kip = {
  43         .name = "ssam:00:00:01:0e:00",
  44         .parent = &ssam_node_root,
  45 };
  46
  47 /* Base device hub (devices attached to Surface Book 3 base). */
  48 static const struct software_node ssam_node_hub_base = {
  49         .name = "ssam:00:00:02:11:00",
  50         .parent = &ssam_node_root,
  51 };
  52
  53 /* AC adapter. */
  54 static const struct software_node ssam_node_bat_ac = {
  55         .name = "ssam:01:02:01:01:01",
  56         .parent = &ssam_node_root,
  57 };
  58
  59 /* Primary battery. */
  60 static const struct software_node ssam_node_bat_main = {
  61         .name = "ssam:01:02:01:01:00",
  62         .parent = &ssam_node_root,
  63 };
  64
  65 /* Secondary battery (Surface Book 3). */
  66 static const struct software_node ssam_node_bat_sb3base = {
  67         .name = "ssam:01:02:02:01:00",
  68         .parent = &ssam_node_hub_base,
  69 };
  70
  71 /* Platform profile / performance-mode device. */
  72 static const struct software_node ssam_node_tmp_pprof = {
  73         .name = "ssam:01:03:01:00:01",
  74         .parent = &ssam_node_root,
  75 };
  76
  77 /* Tablet-mode switch via KIP subsystem. */
  78 static const struct software_node ssam_node_kip_tablet_switch = {
  79         .name = "ssam:01:0e:01:00:01",
  80         .parent = &ssam_node_root,
  81 };
  82
  83 /* DTX / detachment-system device (Surface Book 3). */
  84 static const struct software_node ssam_node_bas_dtx = {
  85         .name = "ssam:01:11:01:00:00",
  86         .parent = &ssam_node_root,
  87 };
  88
  89 /* HID keyboard (TID1). */
  90 static const struct software_node ssam_node_hid_tid1_keyboard = {
  91         .name = "ssam:01:15:01:01:00",
  92         .parent = &ssam_node_root,
  93 };
  94
  95 /* HID pen stash (TID1; pen taken / stashed away evens). */
  96 static const struct software_node ssam_node_hid_tid1_penstash = {
  97         .name = "ssam:01:15:01:02:00",
  98         .parent = &ssam_node_root,
  99 };
 100
 101 /* HID touchpad (TID1). */
 102 static const struct software_node ssam_node_hid_tid1_touchpad = {
 103         .name = "ssam:01:15:01:03:00",
 104         .parent = &ssam_node_root,
 105 };
 106
 107 /* HID device instance 6 (TID1, unknown HID device). */
 108 static const struct software_node ssam_node_hid_tid1_iid6 = {
 109         .name = "ssam:01:15:01:06:00",
 110         .parent = &ssam_node_root,
 111 };
 112
 113 /* HID device instance 7 (TID1, unknown HID device). */
 114 static const struct software_node ssam_node_hid_tid1_iid7 = {
 115         .name = "ssam:01:15:01:07:00",
 116         .parent = &ssam_node_root,
 117 };
 118
 119 /* HID system controls (TID1). */
 120 static const struct software_node ssam_node_hid_tid1_sysctrl = {
 121         .name = "ssam:01:15:01:08:00",
 122         .parent = &ssam_node_root,
 123 };
 124
 125 /* HID keyboard. */
 126 static const struct software_node ssam_node_hid_main_keyboard = {
 127         .name = "ssam:01:15:02:01:00",
 128         .parent = &ssam_node_root,
 129 };
 130
 131 /* HID touchpad. */
 132 static const struct software_node ssam_node_hid_main_touchpad = {
 133         .name = "ssam:01:15:02:03:00",
 134         .parent = &ssam_node_root,
 135 };
 136
 137 /* HID device instance 5 (unknown HID device). */
 138 static const struct software_node ssam_node_hid_main_iid5 = {
 139         .name = "ssam:01:15:02:05:00",
 140         .parent = &ssam_node_root,
 141 };
 142
 143 /* HID keyboard (base hub). */
 144 static const struct software_node ssam_node_hid_base_keyboard = {
 145         .name = "ssam:01:15:02:01:00",
 146         .parent = &ssam_node_hub_base,
 147 };
 148
 149 /* HID touchpad (base hub). */
 150 static const struct software_node ssam_node_hid_base_touchpad = {
 151         .name = "ssam:01:15:02:03:00",
 152         .parent = &ssam_node_hub_base,
 153 };
 154
 155 /* HID device instance 5 (unknown HID device, base hub). */
 156 static const struct software_node ssam_node_hid_base_iid5 = {
 157         .name = "ssam:01:15:02:05:00",
 158         .parent = &ssam_node_hub_base,
 159 };
 160
 161 /* HID device instance 6 (unknown HID device, base hub). */
 162 static const struct software_node ssam_node_hid_base_iid6 = {
 163         .name = "ssam:01:15:02:06:00",
 164         .parent = &ssam_node_hub_base,
 165 };
 166
 167 /* HID keyboard (KIP hub). */
 168 static const struct software_node ssam_node_hid_kip_keyboard = {
 169         .name = "ssam:01:15:02:01:00",
 170         .parent = &ssam_node_hub_kip,
 171 };
 172
 173 /* HID pen stash (KIP hub; pen taken / stashed away evens). */
 174 static const struct software_node ssam_node_hid_kip_penstash = {
 175         .name = "ssam:01:15:02:02:00",
 176         .parent = &ssam_node_hub_kip,
 177 };
 178
 179 /* HID touchpad (KIP hub). */
 180 static const struct software_node ssam_node_hid_kip_touchpad = {
 181         .name = "ssam:01:15:02:03:00",
 182         .parent = &ssam_node_hub_kip,
 183 };
 184
 185 /* HID device instance 5 (KIP hub, unknown HID device). */
 186 static const struct software_node ssam_node_hid_kip_iid5 = {
 187         .name = "ssam:01:15:02:05:00",
 188         .parent = &ssam_node_hub_kip,
 189 };
 190
 191 /* Tablet-mode switch via POS subsystem. */
 192 static const struct software_node ssam_node_pos_tablet_switch = {
 193         .name = "ssam:01:26:01:00:01",
 194         .parent = &ssam_node_root,
 195 };
 196
 197 /*
 198  * Devices for 5th- and 6th-generations models:
 199  * - Surface Book 2,
 200  * - Surface Laptop 1 and 2,
 201  * - Surface Pro 5 and 6.
 202  */
 203 static const struct software_node *ssam_node_group_gen5[] = {
 204         &ssam_node_root,
 205         &ssam_node_tmp_pprof,
 206         NULL,
 207 };
 208
 209 /* Devices for Surface Book 3. */
 210 static const struct software_node *ssam_node_group_sb3[] = {
 211         &ssam_node_root,
 212         &ssam_node_hub_base,
 213         &ssam_node_bat_ac,
 214         &ssam_node_bat_main,
 215         &ssam_node_bat_sb3base,
 216         &ssam_node_tmp_pprof,
 217         &ssam_node_bas_dtx,
 218         &ssam_node_hid_base_keyboard,
 219         &ssam_node_hid_base_touchpad,
 220         &ssam_node_hid_base_iid5,
 221         &ssam_node_hid_base_iid6,
 222         NULL,
 223 };
 224
 225 /* Devices for Surface Laptop 3 and 4. */
 226 static const struct software_node *ssam_node_group_sl3[] = {
 227         &ssam_node_root,
 228         &ssam_node_bat_ac,
 229         &ssam_node_bat_main,
 230         &ssam_node_tmp_pprof,
 231         &ssam_node_hid_main_keyboard,
 232         &ssam_node_hid_main_touchpad,
 233         &ssam_node_hid_main_iid5,
 234         NULL,
 235 };
 236
 237 /* Devices for Surface Laptop Studio. */
 238 static const struct software_node *ssam_node_group_sls[] = {
 239         &ssam_node_root,
 240         &ssam_node_bat_ac,
 241         &ssam_node_bat_main,
 242         &ssam_node_tmp_pprof,
 243         &ssam_node_pos_tablet_switch,
 244         &ssam_node_hid_tid1_keyboard,
 245         &ssam_node_hid_tid1_penstash,
 246         &ssam_node_hid_tid1_touchpad,
 247         &ssam_node_hid_tid1_iid6,
 248         &ssam_node_hid_tid1_iid7,
 249         &ssam_node_hid_tid1_sysctrl,
 250         NULL,
 251 };
 252
 253 /* Devices for Surface Laptop Go. */
 254 static const struct software_node *ssam_node_group_slg1[] = {
 255         &ssam_node_root,
 256         &ssam_node_bat_ac,
 257         &ssam_node_bat_main,
 258         &ssam_node_tmp_pprof,
 259         NULL,
 260 };
 261
 262 /* Devices for Surface Pro 7 and Surface Pro 7+. */
 263 static const struct software_node *ssam_node_group_sp7[] = {
 264         &ssam_node_root,
 265         &ssam_node_bat_ac,
 266         &ssam_node_bat_main,
 267         &ssam_node_tmp_pprof,
 268         NULL,
 269 };
 270
 271 static const struct software_node *ssam_node_group_sp8[] = {
 272         &ssam_node_root,
 273         &ssam_node_hub_kip,
 274         &ssam_node_bat_ac,
 275         &ssam_node_bat_main,
 276         &ssam_node_tmp_pprof,
 277         &ssam_node_kip_tablet_switch,
 278         &ssam_node_hid_kip_keyboard,
 279         &ssam_node_hid_kip_penstash,
 280         &ssam_node_hid_kip_touchpad,
 281         &ssam_node_hid_kip_iid5,
 282         NULL,
 283 };
 284
 285
 286 /* -- SSAM platform/meta-hub driver. ---------------------------------------- */
 287
 288 static const struct acpi_device_id ssam_platform_hub_match[] = {
 289         /* Surface Pro 4, 5, and 6 (OMBR < 0x10) */
 290         { "MSHW0081", (unsigned long)ssam_node_group_gen5 },
 291
 292         /* Surface Pro 6 (OMBR >= 0x10) */
 293         { "MSHW0111", (unsigned long)ssam_node_group_gen5 },
 294
 295         /* Surface Pro 7 */
 296         { "MSHW0116", (unsigned long)ssam_node_group_sp7 },
 297
 298         /* Surface Pro 7+ */
 299         { "MSHW0119", (unsigned long)ssam_node_group_sp7 },
 300
 301         /* Surface Pro 8 */
 302         { "MSHW0263", (unsigned long)ssam_node_group_sp8 },
 303
 304         /* Surface Book 2 */
 305         { "MSHW0107", (unsigned long)ssam_node_group_gen5 },
 306
 307         /* Surface Book 3 */
 308         { "MSHW0117", (unsigned long)ssam_node_group_sb3 },
 309
 310         /* Surface Laptop 1 */
 311         { "MSHW0086", (unsigned long)ssam_node_group_gen5 },
 312
 313         /* Surface Laptop 2 */
 314         { "MSHW0112", (unsigned long)ssam_node_group_gen5 },
 315
 316         /* Surface Laptop 3 (13", Intel) */
 317         { "MSHW0114", (unsigned long)ssam_node_group_sl3 },
 318
 319         /* Surface Laptop 3 (15", AMD) and 4 (15", AMD) */
 320         { "MSHW0110", (unsigned long)ssam_node_group_sl3 },
 321
 322         /* Surface Laptop 4 (13", Intel) */
 323         { "MSHW0250", (unsigned long)ssam_node_group_sl3 },
 324
 325         /* Surface Laptop Go 1 */
 326         { "MSHW0118", (unsigned long)ssam_node_group_slg1 },
 327
 328         /* Surface Laptop Studio */
 329         { "MSHW0123", (unsigned long)ssam_node_group_sls },
 330
 331         { },
 332 };
 333 MODULE_DEVICE_TABLE(acpi, ssam_platform_hub_match);
 334
 335 static int ssam_platform_hub_probe(struct platform_device *pdev)
 336 {
 337         const struct software_node **nodes;
 338         struct ssam_controller *ctrl;
 339         struct fwnode_handle *root;
 340         int status;
 341
 342         nodes = (const struct software_node **)acpi_device_get_match_data(&pdev->dev);
 343         if (!nodes)
 344                 return -ENODEV;
 345
 346         /*
 347          * As we're adding the SSAM client devices as children under this device
 348          * and not the SSAM controller, we need to add a device link to the
 349          * controller to ensure that we remove all of our devices before the
 350          * controller is removed. This also guarantees proper ordering for
 351          * suspend/resume of the devices on this hub.
 352          */
 353         ctrl = ssam_client_bind(&pdev->dev);
 354         if (IS_ERR(ctrl))
 355                 return PTR_ERR(ctrl) == -ENODEV ? -EPROBE_DEFER : PTR_ERR(ctrl);
 356
 357         status = software_node_register_node_group(nodes);
 358         if (status)
 359                 return status;
 360
 361         root = software_node_fwnode(&ssam_node_root);
 362         if (!root) {
 363                 software_node_unregister_node_group(nodes);
 364                 return -ENOENT;
 365         }
 366
 367         set_secondary_fwnode(&pdev->dev, root);
 368
 369         status = __ssam_register_clients(&pdev->dev, ctrl, root);
 370         if (status) {
 371                 set_secondary_fwnode(&pdev->dev, NULL);
 372                 software_node_unregister_node_group(nodes);
 373         }
 374
 375         platform_set_drvdata(pdev, nodes);
 376         return status;
 377 }
 378
 379 static int ssam_platform_hub_remove(struct platform_device *pdev)
 380 {
 381         const struct software_node **nodes = platform_get_drvdata(pdev);
 382
 383         ssam_remove_clients(&pdev->dev);
 384         set_secondary_fwnode(&pdev->dev, NULL);
 385         software_node_unregister_node_group(nodes);
 386         return 0;
 387 }
 388
 389 static struct platform_driver ssam_platform_hub_driver = {
 390         .probe = ssam_platform_hub_probe,
 391         .remove = ssam_platform_hub_remove,
 392         .driver = {
 393                 .name = "surface_aggregator_platform_hub",
 394                 .acpi_match_table = ssam_platform_hub_match,
 395                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 396         },
 397 };
 398 module_platform_driver(ssam_platform_hub_driver);
 399
 400 MODULE_AUTHOR("Maximilian Luz <[email protected]>");
 401 MODULE_DESCRIPTION("Device-registry for Surface System Aggregator Module");
 402 MODULE_LICENSE("GPL");