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0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  *  Intel HID event & 5 button array driver
0004  *
0005  *  Copyright (C) 2015 Alex Hung <alex.hung@canonical.com>
0006  *  Copyright (C) 2015 Andrew Lutomirski <luto@kernel.org>
0007  */
0008 
0009 #include <linux/acpi.h>
0010 #include <linux/dmi.h>
0011 #include <linux/input.h>
0012 #include <linux/input/sparse-keymap.h>
0013 #include <linux/kernel.h>
0014 #include <linux/module.h>
0015 #include <linux/platform_device.h>
0016 #include <linux/suspend.h>
0017 #include "../dual_accel_detect.h"
0018 
0019 /* When NOT in tablet mode, VGBS returns with the flag 0x40 */
0020 #define TABLET_MODE_FLAG BIT(6)
0021 
0022 MODULE_LICENSE("GPL");
0023 MODULE_AUTHOR("Alex Hung");
0024 
0025 static const struct acpi_device_id intel_hid_ids[] = {
0026     {"INT33D5", 0},
0027     {"INTC1051", 0},
0028     {"INTC1054", 0},
0029     {"INTC1070", 0},
0030     {"", 0},
0031 };
0032 MODULE_DEVICE_TABLE(acpi, intel_hid_ids);
0033 
0034 /* In theory, these are HID usages. */
0035 static const struct key_entry intel_hid_keymap[] = {
0036     /* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */
0037     /* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */
0038     { KE_KEY, 3, { KEY_NUMLOCK } },
0039     { KE_KEY, 4, { KEY_HOME } },
0040     { KE_KEY, 5, { KEY_END } },
0041     { KE_KEY, 6, { KEY_PAGEUP } },
0042     { KE_KEY, 7, { KEY_PAGEDOWN } },
0043     { KE_KEY, 8, { KEY_RFKILL } },
0044     { KE_KEY, 9, { KEY_POWER } },
0045     { KE_KEY, 11, { KEY_SLEEP } },
0046     /* 13 has two different meanings in the spec -- ignore it. */
0047     { KE_KEY, 14, { KEY_STOPCD } },
0048     { KE_KEY, 15, { KEY_PLAYPAUSE } },
0049     { KE_KEY, 16, { KEY_MUTE } },
0050     { KE_KEY, 17, { KEY_VOLUMEUP } },
0051     { KE_KEY, 18, { KEY_VOLUMEDOWN } },
0052     { KE_KEY, 19, { KEY_BRIGHTNESSUP } },
0053     { KE_KEY, 20, { KEY_BRIGHTNESSDOWN } },
0054     /* 27: wake -- needs special handling */
0055     { KE_END },
0056 };
0057 
0058 /* 5 button array notification value. */
0059 static const struct key_entry intel_array_keymap[] = {
0060     { KE_KEY,    0xC2, { KEY_LEFTMETA } },                /* Press */
0061     { KE_IGNORE, 0xC3, { KEY_LEFTMETA } },                /* Release */
0062     { KE_KEY,    0xC4, { KEY_VOLUMEUP } },                /* Press */
0063     { KE_IGNORE, 0xC5, { KEY_VOLUMEUP } },                /* Release */
0064     { KE_KEY,    0xC6, { KEY_VOLUMEDOWN } },              /* Press */
0065     { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } },              /* Release */
0066     { KE_KEY,    0xC8, { KEY_ROTATE_LOCK_TOGGLE } },      /* Press */
0067     { KE_IGNORE, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } },      /* Release */
0068     { KE_KEY,    0xCE, { KEY_POWER } },                   /* Press */
0069     { KE_IGNORE, 0xCF, { KEY_POWER } },                   /* Release */
0070     { KE_END },
0071 };
0072 
0073 static const struct dmi_system_id button_array_table[] = {
0074     {
0075         .ident = "Wacom MobileStudio Pro 13",
0076         .matches = {
0077             DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"),
0078             DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 13"),
0079         },
0080     },
0081     {
0082         .ident = "Wacom MobileStudio Pro 16",
0083         .matches = {
0084             DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"),
0085             DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 16"),
0086         },
0087     },
0088     {
0089         .ident = "HP Spectre x2 (2015)",
0090         .matches = {
0091             DMI_MATCH(DMI_SYS_VENDOR, "HP"),
0092             DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x2 Detachable"),
0093         },
0094     },
0095     {
0096         .ident = "Lenovo ThinkPad X1 Tablet Gen 2",
0097         .matches = {
0098             DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
0099             DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Tablet Gen 2"),
0100         },
0101     },
0102     {
0103         .ident = "Microsoft Surface Go 3",
0104         .matches = {
0105             DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
0106             DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
0107         },
0108     },
0109     { }
0110 };
0111 
0112 /*
0113  * Some convertible use the intel-hid ACPI interface to report SW_TABLET_MODE,
0114  * these need to be compared via a DMI based authorization list because some
0115  * models have unreliable VGBS return which could cause incorrect
0116  * SW_TABLET_MODE report.
0117  */
0118 static const struct dmi_system_id dmi_vgbs_allow_list[] = {
0119     {
0120         .matches = {
0121             DMI_MATCH(DMI_SYS_VENDOR, "HP"),
0122             DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x360 Convertible 15-df0xxx"),
0123         },
0124     },
0125     {
0126         .matches = {
0127             DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
0128             DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go"),
0129         },
0130     },
0131     { }
0132 };
0133 
0134 /*
0135  * Some devices, even non convertible ones, can send incorrect SW_TABLET_MODE
0136  * reports. Accept such reports only from devices in this list.
0137  */
0138 static const struct dmi_system_id dmi_auto_add_switch[] = {
0139     {
0140         .matches = {
0141             DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */),
0142         },
0143     },
0144     {
0145         .matches = {
0146             DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */),
0147         },
0148     },
0149     {} /* Array terminator */
0150 };
0151 
0152 struct intel_hid_priv {
0153     struct input_dev *input_dev;
0154     struct input_dev *array;
0155     struct input_dev *switches;
0156     bool wakeup_mode;
0157     bool auto_add_switch;
0158 };
0159 
0160 #define HID_EVENT_FILTER_UUID   "eeec56b3-4442-408f-a792-4edd4d758054"
0161 
0162 enum intel_hid_dsm_fn_codes {
0163     INTEL_HID_DSM_FN_INVALID,
0164     INTEL_HID_DSM_BTNL_FN,
0165     INTEL_HID_DSM_HDMM_FN,
0166     INTEL_HID_DSM_HDSM_FN,
0167     INTEL_HID_DSM_HDEM_FN,
0168     INTEL_HID_DSM_BTNS_FN,
0169     INTEL_HID_DSM_BTNE_FN,
0170     INTEL_HID_DSM_HEBC_V1_FN,
0171     INTEL_HID_DSM_VGBS_FN,
0172     INTEL_HID_DSM_HEBC_V2_FN,
0173     INTEL_HID_DSM_FN_MAX
0174 };
0175 
0176 static const char *intel_hid_dsm_fn_to_method[INTEL_HID_DSM_FN_MAX] = {
0177     NULL,
0178     "BTNL",
0179     "HDMM",
0180     "HDSM",
0181     "HDEM",
0182     "BTNS",
0183     "BTNE",
0184     "HEBC",
0185     "VGBS",
0186     "HEBC"
0187 };
0188 
0189 static unsigned long long intel_hid_dsm_fn_mask;
0190 static guid_t intel_dsm_guid;
0191 
0192 static bool intel_hid_execute_method(acpi_handle handle,
0193                      enum intel_hid_dsm_fn_codes fn_index,
0194                      unsigned long long arg)
0195 {
0196     union acpi_object *obj, argv4, req;
0197     acpi_status status;
0198     char *method_name;
0199 
0200     if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
0201         fn_index >= INTEL_HID_DSM_FN_MAX)
0202         return false;
0203 
0204     method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
0205 
0206     if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
0207         goto skip_dsm_exec;
0208 
0209     /* All methods expects a package with one integer element */
0210     req.type = ACPI_TYPE_INTEGER;
0211     req.integer.value = arg;
0212 
0213     argv4.type = ACPI_TYPE_PACKAGE;
0214     argv4.package.count = 1;
0215     argv4.package.elements = &req;
0216 
0217     obj = acpi_evaluate_dsm(handle, &intel_dsm_guid, 1, fn_index, &argv4);
0218     if (obj) {
0219         acpi_handle_debug(handle, "Exec DSM Fn code: %d[%s] success\n",
0220                   fn_index, method_name);
0221         ACPI_FREE(obj);
0222         return true;
0223     }
0224 
0225 skip_dsm_exec:
0226     status = acpi_execute_simple_method(handle, method_name, arg);
0227     if (ACPI_SUCCESS(status))
0228         return true;
0229 
0230     return false;
0231 }
0232 
0233 static bool intel_hid_evaluate_method(acpi_handle handle,
0234                       enum intel_hid_dsm_fn_codes fn_index,
0235                       unsigned long long *result)
0236 {
0237     union acpi_object *obj;
0238     acpi_status status;
0239     char *method_name;
0240 
0241     if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
0242         fn_index >= INTEL_HID_DSM_FN_MAX)
0243         return false;
0244 
0245     method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
0246 
0247     if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
0248         goto skip_dsm_eval;
0249 
0250     obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid,
0251                       1, fn_index,
0252                       NULL,  ACPI_TYPE_INTEGER);
0253     if (obj) {
0254         *result = obj->integer.value;
0255         acpi_handle_debug(handle,
0256                   "Eval DSM Fn code: %d[%s] results: 0x%llx\n",
0257                   fn_index, method_name, *result);
0258         ACPI_FREE(obj);
0259         return true;
0260     }
0261 
0262 skip_dsm_eval:
0263     status = acpi_evaluate_integer(handle, method_name, NULL, result);
0264     if (ACPI_SUCCESS(status))
0265         return true;
0266 
0267     return false;
0268 }
0269 
0270 static void intel_hid_init_dsm(acpi_handle handle)
0271 {
0272     union acpi_object *obj;
0273 
0274     guid_parse(HID_EVENT_FILTER_UUID, &intel_dsm_guid);
0275 
0276     obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid, 1, 0, NULL,
0277                       ACPI_TYPE_BUFFER);
0278     if (obj) {
0279         switch (obj->buffer.length) {
0280         default:
0281         case 2:
0282             intel_hid_dsm_fn_mask = *(u16 *)obj->buffer.pointer;
0283             break;
0284         case 1:
0285             intel_hid_dsm_fn_mask = *obj->buffer.pointer;
0286             break;
0287         case 0:
0288             acpi_handle_warn(handle, "intel_hid_dsm_fn_mask length is zero\n");
0289             intel_hid_dsm_fn_mask = 0;
0290             break;
0291         }
0292         ACPI_FREE(obj);
0293     }
0294 
0295     acpi_handle_debug(handle, "intel_hid_dsm_fn_mask = %llx\n",
0296               intel_hid_dsm_fn_mask);
0297 }
0298 
0299 static int intel_hid_set_enable(struct device *device, bool enable)
0300 {
0301     acpi_handle handle = ACPI_HANDLE(device);
0302 
0303     /* Enable|disable features - power button is always enabled */
0304     if (!intel_hid_execute_method(handle, INTEL_HID_DSM_HDSM_FN,
0305                       enable)) {
0306         dev_warn(device, "failed to %sable hotkeys\n",
0307              enable ? "en" : "dis");
0308         return -EIO;
0309     }
0310 
0311     return 0;
0312 }
0313 
0314 static void intel_button_array_enable(struct device *device, bool enable)
0315 {
0316     struct intel_hid_priv *priv = dev_get_drvdata(device);
0317     acpi_handle handle = ACPI_HANDLE(device);
0318     unsigned long long button_cap;
0319     acpi_status status;
0320 
0321     if (!priv->array)
0322         return;
0323 
0324     /* Query supported platform features */
0325     status = acpi_evaluate_integer(handle, "BTNC", NULL, &button_cap);
0326     if (ACPI_FAILURE(status)) {
0327         dev_warn(device, "failed to get button capability\n");
0328         return;
0329     }
0330 
0331     /* Enable|disable features - power button is always enabled */
0332     if (!intel_hid_execute_method(handle, INTEL_HID_DSM_BTNE_FN,
0333                       enable ? button_cap : 1))
0334         dev_warn(device, "failed to set button capability\n");
0335 }
0336 
0337 static int intel_hid_pm_prepare(struct device *device)
0338 {
0339     if (device_may_wakeup(device)) {
0340         struct intel_hid_priv *priv = dev_get_drvdata(device);
0341 
0342         priv->wakeup_mode = true;
0343     }
0344     return 0;
0345 }
0346 
0347 static void intel_hid_pm_complete(struct device *device)
0348 {
0349     struct intel_hid_priv *priv = dev_get_drvdata(device);
0350 
0351     priv->wakeup_mode = false;
0352 }
0353 
0354 static int intel_hid_pl_suspend_handler(struct device *device)
0355 {
0356     intel_button_array_enable(device, false);
0357 
0358     if (!pm_suspend_no_platform())
0359         intel_hid_set_enable(device, false);
0360 
0361     return 0;
0362 }
0363 
0364 static int intel_hid_pl_resume_handler(struct device *device)
0365 {
0366     intel_hid_pm_complete(device);
0367 
0368     if (!pm_suspend_no_platform())
0369         intel_hid_set_enable(device, true);
0370 
0371     intel_button_array_enable(device, true);
0372     return 0;
0373 }
0374 
0375 static const struct dev_pm_ops intel_hid_pl_pm_ops = {
0376     .prepare = intel_hid_pm_prepare,
0377     .complete = intel_hid_pm_complete,
0378     .freeze  = intel_hid_pl_suspend_handler,
0379     .thaw  = intel_hid_pl_resume_handler,
0380     .restore  = intel_hid_pl_resume_handler,
0381     .suspend  = intel_hid_pl_suspend_handler,
0382     .resume  = intel_hid_pl_resume_handler,
0383 };
0384 
0385 static int intel_hid_input_setup(struct platform_device *device)
0386 {
0387     struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
0388     int ret;
0389 
0390     priv->input_dev = devm_input_allocate_device(&device->dev);
0391     if (!priv->input_dev)
0392         return -ENOMEM;
0393 
0394     ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL);
0395     if (ret)
0396         return ret;
0397 
0398     priv->input_dev->name = "Intel HID events";
0399     priv->input_dev->id.bustype = BUS_HOST;
0400 
0401     return input_register_device(priv->input_dev);
0402 }
0403 
0404 static int intel_button_array_input_setup(struct platform_device *device)
0405 {
0406     struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
0407     int ret;
0408 
0409     /* Setup input device for 5 button array */
0410     priv->array = devm_input_allocate_device(&device->dev);
0411     if (!priv->array)
0412         return -ENOMEM;
0413 
0414     ret = sparse_keymap_setup(priv->array, intel_array_keymap, NULL);
0415     if (ret)
0416         return ret;
0417 
0418     priv->array->name = "Intel HID 5 button array";
0419     priv->array->id.bustype = BUS_HOST;
0420 
0421     return input_register_device(priv->array);
0422 }
0423 
0424 static int intel_hid_switches_setup(struct platform_device *device)
0425 {
0426     struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
0427 
0428     /* Setup input device for switches */
0429     priv->switches = devm_input_allocate_device(&device->dev);
0430     if (!priv->switches)
0431         return -ENOMEM;
0432 
0433     __set_bit(EV_SW, priv->switches->evbit);
0434     __set_bit(SW_TABLET_MODE, priv->switches->swbit);
0435 
0436     priv->switches->name = "Intel HID switches";
0437     priv->switches->id.bustype = BUS_HOST;
0438     return input_register_device(priv->switches);
0439 }
0440 
0441 static void report_tablet_mode_state(struct platform_device *device)
0442 {
0443     struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
0444     acpi_handle handle = ACPI_HANDLE(&device->dev);
0445     unsigned long long vgbs;
0446     int m;
0447 
0448     if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_VGBS_FN, &vgbs))
0449         return;
0450 
0451     m = !(vgbs & TABLET_MODE_FLAG);
0452     input_report_switch(priv->switches, SW_TABLET_MODE, m);
0453     input_sync(priv->switches);
0454 }
0455 
0456 static bool report_tablet_mode_event(struct input_dev *input_dev, u32 event)
0457 {
0458     if (!input_dev)
0459         return false;
0460 
0461     switch (event) {
0462     case 0xcc:
0463         input_report_switch(input_dev, SW_TABLET_MODE, 1);
0464         input_sync(input_dev);
0465         return true;
0466     case 0xcd:
0467         input_report_switch(input_dev, SW_TABLET_MODE, 0);
0468         input_sync(input_dev);
0469         return true;
0470     default:
0471         return false;
0472     }
0473 }
0474 
0475 static void notify_handler(acpi_handle handle, u32 event, void *context)
0476 {
0477     struct platform_device *device = context;
0478     struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
0479     unsigned long long ev_index;
0480     int err;
0481 
0482     /*
0483      * Some convertible have unreliable VGBS return which could cause incorrect
0484      * SW_TABLET_MODE report, in these cases we enable support when receiving
0485      * the first event instead of during driver setup.
0486      */
0487     if (!priv->switches && priv->auto_add_switch && (event == 0xcc || event == 0xcd)) {
0488         dev_info(&device->dev, "switch event received, enable switches supports\n");
0489         err = intel_hid_switches_setup(device);
0490         if (err)
0491             pr_err("Failed to setup Intel HID switches\n");
0492     }
0493 
0494     if (priv->wakeup_mode) {
0495         /*
0496          * Needed for wakeup from suspend-to-idle to work on some
0497          * platforms that don't expose the 5-button array, but still
0498          * send notifies with the power button event code to this
0499          * device object on power button actions while suspended.
0500          */
0501         if (event == 0xce)
0502             goto wakeup;
0503 
0504         /*
0505          * Some devices send (duplicate) tablet-mode events when moved
0506          * around even though the mode has not changed; and they do this
0507          * even when suspended.
0508          * Update the switch state in case it changed and then return
0509          * without waking up to avoid spurious wakeups.
0510          */
0511         if (event == 0xcc || event == 0xcd) {
0512             report_tablet_mode_event(priv->switches, event);
0513             return;
0514         }
0515 
0516         /* Wake up on 5-button array events only. */
0517         if (event == 0xc0 || !priv->array)
0518             return;
0519 
0520         if (!sparse_keymap_entry_from_scancode(priv->array, event)) {
0521             dev_info(&device->dev, "unknown event 0x%x\n", event);
0522             return;
0523         }
0524 
0525 wakeup:
0526         pm_wakeup_hard_event(&device->dev);
0527 
0528         return;
0529     }
0530 
0531     /*
0532      * Needed for suspend to work on some platforms that don't expose
0533      * the 5-button array, but still send notifies with power button
0534      * event code to this device object on power button actions.
0535      *
0536      * Report the power button press and release.
0537      */
0538     if (!priv->array) {
0539         if (event == 0xce) {
0540             input_report_key(priv->input_dev, KEY_POWER, 1);
0541             input_sync(priv->input_dev);
0542             return;
0543         }
0544 
0545         if (event == 0xcf) {
0546             input_report_key(priv->input_dev, KEY_POWER, 0);
0547             input_sync(priv->input_dev);
0548             return;
0549         }
0550     }
0551 
0552     if (report_tablet_mode_event(priv->switches, event))
0553         return;
0554 
0555     /* 0xC0 is for HID events, other values are for 5 button array */
0556     if (event != 0xc0) {
0557         if (!priv->array ||
0558             !sparse_keymap_report_event(priv->array, event, 1, true))
0559             dev_dbg(&device->dev, "unknown event 0x%x\n", event);
0560         return;
0561     }
0562 
0563     if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDEM_FN,
0564                        &ev_index)) {
0565         dev_warn(&device->dev, "failed to get event index\n");
0566         return;
0567     }
0568 
0569     if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true))
0570         dev_dbg(&device->dev, "unknown event index 0x%llx\n",
0571              ev_index);
0572 }
0573 
0574 static bool button_array_present(struct platform_device *device)
0575 {
0576     acpi_handle handle = ACPI_HANDLE(&device->dev);
0577     unsigned long long event_cap;
0578 
0579     if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V2_FN,
0580                       &event_cap)) {
0581         /* Check presence of 5 button array or v2 power button */
0582         if (event_cap & 0x60000)
0583             return true;
0584     }
0585 
0586     if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V1_FN,
0587                       &event_cap)) {
0588         if (event_cap & 0x20000)
0589             return true;
0590     }
0591 
0592     if (dmi_check_system(button_array_table))
0593         return true;
0594 
0595     return false;
0596 }
0597 
0598 static int intel_hid_probe(struct platform_device *device)
0599 {
0600     acpi_handle handle = ACPI_HANDLE(&device->dev);
0601     unsigned long long mode;
0602     struct intel_hid_priv *priv;
0603     acpi_status status;
0604     int err;
0605 
0606     intel_hid_init_dsm(handle);
0607 
0608     if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDMM_FN, &mode)) {
0609         dev_warn(&device->dev, "failed to read mode\n");
0610         return -ENODEV;
0611     }
0612 
0613     if (mode != 0) {
0614         /*
0615          * This driver only implements "simple" mode.  There appear
0616          * to be no other modes, but we should be paranoid and check
0617          * for compatibility.
0618          */
0619         dev_info(&device->dev, "platform is not in simple mode\n");
0620         return -ENODEV;
0621     }
0622 
0623     priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
0624     if (!priv)
0625         return -ENOMEM;
0626     dev_set_drvdata(&device->dev, priv);
0627 
0628     /* See dual_accel_detect.h for more info on the dual_accel check. */
0629     priv->auto_add_switch = dmi_check_system(dmi_auto_add_switch) && !dual_accel_detect();
0630 
0631     err = intel_hid_input_setup(device);
0632     if (err) {
0633         pr_err("Failed to setup Intel HID hotkeys\n");
0634         return err;
0635     }
0636 
0637     /* Setup 5 button array */
0638     if (button_array_present(device)) {
0639         dev_info(&device->dev, "platform supports 5 button array\n");
0640         err = intel_button_array_input_setup(device);
0641         if (err)
0642             pr_err("Failed to setup Intel 5 button array hotkeys\n");
0643     }
0644 
0645     /* Setup switches for devices that we know VGBS return correctly */
0646     if (dmi_check_system(dmi_vgbs_allow_list)) {
0647         dev_info(&device->dev, "platform supports switches\n");
0648         err = intel_hid_switches_setup(device);
0649         if (err)
0650             pr_err("Failed to setup Intel HID switches\n");
0651         else
0652             report_tablet_mode_state(device);
0653     }
0654 
0655     status = acpi_install_notify_handler(handle,
0656                          ACPI_DEVICE_NOTIFY,
0657                          notify_handler,
0658                          device);
0659     if (ACPI_FAILURE(status))
0660         return -EBUSY;
0661 
0662     err = intel_hid_set_enable(&device->dev, true);
0663     if (err)
0664         goto err_remove_notify;
0665 
0666     if (priv->array) {
0667         unsigned long long dummy;
0668 
0669         intel_button_array_enable(&device->dev, true);
0670 
0671         /* Call button load method to enable HID power button */
0672         if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_BTNL_FN,
0673                            &dummy)) {
0674             dev_warn(&device->dev,
0675                  "failed to enable HID power button\n");
0676         }
0677     }
0678 
0679     device_init_wakeup(&device->dev, true);
0680     /*
0681      * In order for system wakeup to work, the EC GPE has to be marked as
0682      * a wakeup one, so do that here (this setting will persist, but it has
0683      * no effect until the wakeup mask is set for the EC GPE).
0684      */
0685     acpi_ec_mark_gpe_for_wake();
0686     return 0;
0687 
0688 err_remove_notify:
0689     acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
0690 
0691     return err;
0692 }
0693 
0694 static int intel_hid_remove(struct platform_device *device)
0695 {
0696     acpi_handle handle = ACPI_HANDLE(&device->dev);
0697 
0698     device_init_wakeup(&device->dev, false);
0699     acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
0700     intel_hid_set_enable(&device->dev, false);
0701     intel_button_array_enable(&device->dev, false);
0702 
0703     /*
0704      * Even if we failed to shut off the event stream, we can still
0705      * safely detach from the device.
0706      */
0707     return 0;
0708 }
0709 
0710 static struct platform_driver intel_hid_pl_driver = {
0711     .driver = {
0712         .name = "intel-hid",
0713         .acpi_match_table = intel_hid_ids,
0714         .pm = &intel_hid_pl_pm_ops,
0715     },
0716     .probe = intel_hid_probe,
0717     .remove = intel_hid_remove,
0718 };
0719 
0720 /*
0721  * Unfortunately, some laptops provide a _HID="INT33D5" device with
0722  * _CID="PNP0C02".  This causes the pnpacpi scan driver to claim the
0723  * ACPI node, so no platform device will be created.  The pnpacpi
0724  * driver rejects this device in subsequent processing, so no physical
0725  * node is created at all.
0726  *
0727  * As a workaround until the ACPI core figures out how to handle
0728  * this corner case, manually ask the ACPI platform device code to
0729  * claim the ACPI node.
0730  */
0731 static acpi_status __init
0732 check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
0733 {
0734     const struct acpi_device_id *ids = context;
0735     struct acpi_device *dev = acpi_fetch_acpi_dev(handle);
0736 
0737     if (dev && acpi_match_device_ids(dev, ids) == 0)
0738         if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL)))
0739             dev_info(&dev->dev,
0740                  "intel-hid: created platform device\n");
0741 
0742     return AE_OK;
0743 }
0744 
0745 static int __init intel_hid_init(void)
0746 {
0747     acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
0748                 ACPI_UINT32_MAX, check_acpi_dev, NULL,
0749                 (void *)intel_hid_ids, NULL);
0750 
0751     return platform_driver_register(&intel_hid_pl_driver);
0752 }
0753 module_init(intel_hid_init);
0754 
0755 static void __exit intel_hid_exit(void)
0756 {
0757     platform_driver_unregister(&intel_hid_pl_driver);
0758 }
0759 module_exit(intel_hid_exit);
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