/* * Intel HID event & 5 button array driver * * Copyright (C) 2015 Alex Hung * Copyright (C) 2015 Andrew Lutomirski * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include #include #include #include #include #include #include #include MODULE_LICENSE("GPL"); MODULE_AUTHOR("Alex Hung"); static const struct acpi_device_id intel_hid_ids[] = { {"INT33D5", 0}, {"", 0}, }; /* In theory, these are HID usages. */ static const struct key_entry intel_hid_keymap[] = { /* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */ /* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */ { KE_KEY, 3, { KEY_NUMLOCK } }, { KE_KEY, 4, { KEY_HOME } }, { KE_KEY, 5, { KEY_END } }, { KE_KEY, 6, { KEY_PAGEUP } }, { KE_KEY, 7, { KEY_PAGEDOWN } }, { KE_KEY, 8, { KEY_RFKILL } }, { KE_KEY, 9, { KEY_POWER } }, { KE_KEY, 11, { KEY_SLEEP } }, /* 13 has two different meanings in the spec -- ignore it. */ { KE_KEY, 14, { KEY_STOPCD } }, { KE_KEY, 15, { KEY_PLAYPAUSE } }, { KE_KEY, 16, { KEY_MUTE } }, { KE_KEY, 17, { KEY_VOLUMEUP } }, { KE_KEY, 18, { KEY_VOLUMEDOWN } }, { KE_KEY, 19, { KEY_BRIGHTNESSUP } }, { KE_KEY, 20, { KEY_BRIGHTNESSDOWN } }, /* 27: wake -- needs special handling */ { KE_END }, }; /* 5 button array notification value. */ static const struct key_entry intel_array_keymap[] = { { KE_KEY, 0xC2, { KEY_LEFTMETA } }, /* Press */ { KE_IGNORE, 0xC3, { KEY_LEFTMETA } }, /* Release */ { KE_KEY, 0xC4, { KEY_VOLUMEUP } }, /* Press */ { KE_IGNORE, 0xC5, { KEY_VOLUMEUP } }, /* Release */ { KE_KEY, 0xC6, { KEY_VOLUMEDOWN } }, /* Press */ { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* Release */ { KE_KEY, 0xC8, { KEY_ROTATE_LOCK_TOGGLE } }, /* Press */ { KE_IGNORE, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } }, /* Release */ { KE_KEY, 0xCE, { KEY_POWER } }, /* Press */ { KE_IGNORE, 0xCF, { KEY_POWER } }, /* Release */ { KE_END }, }; static const struct dmi_system_id button_array_table[] = { { .ident = "Wacom MobileStudio Pro 13", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"), DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 13"), }, }, { .ident = "Wacom MobileStudio Pro 16", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"), DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 16"), }, }, { .ident = "HP Spectre x2 (2015)", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "HP"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x2 Detachable"), }, }, { .ident = "Lenovo ThinkPad X1 Tablet Gen 2", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Tablet Gen 2"), }, }, { } }; struct intel_hid_priv { struct input_dev *input_dev; struct input_dev *array; bool wakeup_mode; }; #define HID_EVENT_FILTER_UUID "eeec56b3-4442-408f-a792-4edd4d758054" enum intel_hid_dsm_fn_codes { INTEL_HID_DSM_FN_INVALID, INTEL_HID_DSM_BTNL_FN, INTEL_HID_DSM_HDMM_FN, INTEL_HID_DSM_HDSM_FN, INTEL_HID_DSM_HDEM_FN, INTEL_HID_DSM_BTNS_FN, INTEL_HID_DSM_BTNE_FN, INTEL_HID_DSM_HEBC_V1_FN, INTEL_HID_DSM_VGBS_FN, INTEL_HID_DSM_HEBC_V2_FN, INTEL_HID_DSM_FN_MAX }; static const char *intel_hid_dsm_fn_to_method[INTEL_HID_DSM_FN_MAX] = { NULL, "BTNL", "HDMM", "HDSM", "HDEM", "BTNS", "BTNE", "HEBC", "VGBS", "HEBC" }; static unsigned long long intel_hid_dsm_fn_mask; static guid_t intel_dsm_guid; static bool intel_hid_execute_method(acpi_handle handle, enum intel_hid_dsm_fn_codes fn_index, unsigned long long arg) { union acpi_object *obj, argv4, req; acpi_status status; char *method_name; if (fn_index <= INTEL_HID_DSM_FN_INVALID || fn_index >= INTEL_HID_DSM_FN_MAX) return false; method_name = (char *)intel_hid_dsm_fn_to_method[fn_index]; if (!(intel_hid_dsm_fn_mask & fn_index)) goto skip_dsm_exec; /* All methods expects a package with one integer element */ req.type = ACPI_TYPE_INTEGER; req.integer.value = arg; argv4.type = ACPI_TYPE_PACKAGE; argv4.package.count = 1; argv4.package.elements = &req; obj = acpi_evaluate_dsm(handle, &intel_dsm_guid, 1, fn_index, &argv4); if (obj) { acpi_handle_debug(handle, "Exec DSM Fn code: %d[%s] success\n", fn_index, method_name); ACPI_FREE(obj); return true; } skip_dsm_exec: status = acpi_execute_simple_method(handle, method_name, arg); if (ACPI_SUCCESS(status)) return true; return false; } static bool intel_hid_evaluate_method(acpi_handle handle, enum intel_hid_dsm_fn_codes fn_index, unsigned long long *result) { union acpi_object *obj; acpi_status status; char *method_name; if (fn_index <= INTEL_HID_DSM_FN_INVALID || fn_index >= INTEL_HID_DSM_FN_MAX) return false; method_name = (char *)intel_hid_dsm_fn_to_method[fn_index]; if (!(intel_hid_dsm_fn_mask & fn_index)) goto skip_dsm_eval; obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid, 1, fn_index, NULL, ACPI_TYPE_INTEGER); if (obj) { *result = obj->integer.value; acpi_handle_debug(handle, "Eval DSM Fn code: %d[%s] results: 0x%llx\n", fn_index, method_name, *result); ACPI_FREE(obj); return true; } skip_dsm_eval: status = acpi_evaluate_integer(handle, method_name, NULL, result); if (ACPI_SUCCESS(status)) return true; return false; } static void intel_hid_init_dsm(acpi_handle handle) { union acpi_object *obj; guid_parse(HID_EVENT_FILTER_UUID, &intel_dsm_guid); obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid, 1, 0, NULL, ACPI_TYPE_BUFFER); if (obj) { intel_hid_dsm_fn_mask = *obj->buffer.pointer; ACPI_FREE(obj); } acpi_handle_debug(handle, "intel_hid_dsm_fn_mask = %llx\n", intel_hid_dsm_fn_mask); } static int intel_hid_set_enable(struct device *device, bool enable) { acpi_handle handle = ACPI_HANDLE(device); /* Enable|disable features - power button is always enabled */ if (!intel_hid_execute_method(handle, INTEL_HID_DSM_HDSM_FN, enable)) { dev_warn(device, "failed to %sable hotkeys\n", enable ? "en" : "dis"); return -EIO; } return 0; } static void intel_button_array_enable(struct device *device, bool enable) { struct intel_hid_priv *priv = dev_get_drvdata(device); acpi_handle handle = ACPI_HANDLE(device); unsigned long long button_cap; acpi_status status; if (!priv->array) return; /* Query supported platform features */ status = acpi_evaluate_integer(handle, "BTNC", NULL, &button_cap); if (ACPI_FAILURE(status)) { dev_warn(device, "failed to get button capability\n"); return; } /* Enable|disable features - power button is always enabled */ if (!intel_hid_execute_method(handle, INTEL_HID_DSM_BTNE_FN, enable ? button_cap : 1)) dev_warn(device, "failed to set button capability\n"); } static int intel_hid_pm_prepare(struct device *device) { struct intel_hid_priv *priv = dev_get_drvdata(device); priv->wakeup_mode = true; return 0; } static int intel_hid_pl_suspend_handler(struct device *device) { if (pm_suspend_via_firmware()) { intel_hid_set_enable(device, false); intel_button_array_enable(device, false); } return 0; } static int intel_hid_pl_resume_handler(struct device *device) { struct intel_hid_priv *priv = dev_get_drvdata(device); priv->wakeup_mode = false; if (pm_resume_via_firmware()) { intel_hid_set_enable(device, true); intel_button_array_enable(device, true); } return 0; } static const struct dev_pm_ops intel_hid_pl_pm_ops = { .prepare = intel_hid_pm_prepare, .freeze = intel_hid_pl_suspend_handler, .thaw = intel_hid_pl_resume_handler, .restore = intel_hid_pl_resume_handler, .suspend = intel_hid_pl_suspend_handler, .resume = intel_hid_pl_resume_handler, }; static int intel_hid_input_setup(struct platform_device *device) { struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); int ret; priv->input_dev = devm_input_allocate_device(&device->dev); if (!priv->input_dev) return -ENOMEM; ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL); if (ret) return ret; priv->input_dev->name = "Intel HID events"; priv->input_dev->id.bustype = BUS_HOST; return input_register_device(priv->input_dev); } static int intel_button_array_input_setup(struct platform_device *device) { struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); int ret; /* Setup input device for 5 button array */ priv->array = devm_input_allocate_device(&device->dev); if (!priv->array) return -ENOMEM; ret = sparse_keymap_setup(priv->array, intel_array_keymap, NULL); if (ret) return ret; priv->array->name = "Intel HID 5 button array"; priv->array->id.bustype = BUS_HOST; return input_register_device(priv->array); } static void notify_handler(acpi_handle handle, u32 event, void *context) { struct platform_device *device = context; struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); unsigned long long ev_index; if (priv->wakeup_mode) { /* * Needed for wakeup from suspend-to-idle to work on some * platforms that don't expose the 5-button array, but still * send notifies with the power button event code to this * device object on power button actions while suspended. */ if (event == 0xce) goto wakeup; /* Wake up on 5-button array events only. */ if (event == 0xc0 || !priv->array) return; if (!sparse_keymap_entry_from_scancode(priv->array, event)) { dev_info(&device->dev, "unknown event 0x%x\n", event); return; } wakeup: pm_wakeup_hard_event(&device->dev); return; } /* * Needed for suspend to work on some platforms that don't expose * the 5-button array, but still send notifies with power button * event code to this device object on power button actions. * * Report the power button press and release. */ if (!priv->array) { if (event == 0xce) { input_report_key(priv->input_dev, KEY_POWER, 1); input_sync(priv->input_dev); return; } if (event == 0xcf) { input_report_key(priv->input_dev, KEY_POWER, 0); input_sync(priv->input_dev); return; } } /* 0xC0 is for HID events, other values are for 5 button array */ if (event != 0xc0) { if (!priv->array || !sparse_keymap_report_event(priv->array, event, 1, true)) dev_dbg(&device->dev, "unknown event 0x%x\n", event); return; } if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDEM_FN, &ev_index)) { dev_warn(&device->dev, "failed to get event index\n"); return; } if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true)) dev_dbg(&device->dev, "unknown event index 0x%llx\n", ev_index); } static bool button_array_present(struct platform_device *device) { acpi_handle handle = ACPI_HANDLE(&device->dev); unsigned long long event_cap; if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V2_FN, &event_cap)) { /* Check presence of 5 button array or v2 power button */ if (event_cap & 0x60000) return true; } if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V1_FN, &event_cap)) { if (event_cap & 0x20000) return true; } if (dmi_check_system(button_array_table)) return true; return false; } static int intel_hid_probe(struct platform_device *device) { acpi_handle handle = ACPI_HANDLE(&device->dev); unsigned long long mode, dummy; struct intel_hid_priv *priv; acpi_status status; int err; intel_hid_init_dsm(handle); if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDMM_FN, &mode)) { dev_warn(&device->dev, "failed to read mode\n"); return -ENODEV; } if (mode != 0) { /* * This driver only implements "simple" mode. There appear * to be no other modes, but we should be paranoid and check * for compatibility. */ dev_info(&device->dev, "platform is not in simple mode\n"); return -ENODEV; } priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; dev_set_drvdata(&device->dev, priv); err = intel_hid_input_setup(device); if (err) { pr_err("Failed to setup Intel HID hotkeys\n"); return err; } /* Setup 5 button array */ if (button_array_present(device)) { dev_info(&device->dev, "platform supports 5 button array\n"); err = intel_button_array_input_setup(device); if (err) pr_err("Failed to setup Intel 5 button array hotkeys\n"); } status = acpi_install_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler, device); if (ACPI_FAILURE(status)) return -EBUSY; err = intel_hid_set_enable(&device->dev, true); if (err) goto err_remove_notify; intel_button_array_enable(&device->dev, true); /* * Call button load method to enable HID power button * Always do this since it activates events on some devices without * a button array too. */ if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_BTNL_FN, &dummy)) dev_warn(&device->dev, "failed to enable HID power button\n"); device_init_wakeup(&device->dev, true); return 0; err_remove_notify: acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler); return err; } static int intel_hid_remove(struct platform_device *device) { acpi_handle handle = ACPI_HANDLE(&device->dev); device_init_wakeup(&device->dev, false); acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler); intel_hid_set_enable(&device->dev, false); intel_button_array_enable(&device->dev, false); /* * Even if we failed to shut off the event stream, we can still * safely detach from the device. */ return 0; } static struct platform_driver intel_hid_pl_driver = { .driver = { .name = "intel-hid", .acpi_match_table = intel_hid_ids, .pm = &intel_hid_pl_pm_ops, }, .probe = intel_hid_probe, .remove = intel_hid_remove, }; MODULE_DEVICE_TABLE(acpi, intel_hid_ids); /* * Unfortunately, some laptops provide a _HID="INT33D5" device with * _CID="PNP0C02". This causes the pnpacpi scan driver to claim the * ACPI node, so no platform device will be created. The pnpacpi * driver rejects this device in subsequent processing, so no physical * node is created at all. * * As a workaround until the ACPI core figures out how to handle * this corner case, manually ask the ACPI platform device code to * claim the ACPI node. */ static acpi_status __init check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv) { const struct acpi_device_id *ids = context; struct acpi_device *dev; if (acpi_bus_get_device(handle, &dev) != 0) return AE_OK; if (acpi_match_device_ids(dev, ids) == 0) if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL))) dev_info(&dev->dev, "intel-hid: created platform device\n"); return AE_OK; } static int __init intel_hid_init(void) { acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, check_acpi_dev, NULL, (void *)intel_hid_ids, NULL); return platform_driver_register(&intel_hid_pl_driver); } module_init(intel_hid_init); static void __exit intel_hid_exit(void) { platform_driver_unregister(&intel_hid_pl_driver); } module_exit(intel_hid_exit);