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740 lines
20 KiB
740 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Intel HID event & 5 button array driver |
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* |
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* Copyright (C) 2015 Alex Hung <[email protected]> |
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* Copyright (C) 2015 Andrew Lutomirski <[email protected]> |
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*/ |
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|
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#include <linux/acpi.h> |
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#include <linux/dmi.h> |
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#include <linux/input.h> |
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#include <linux/input/sparse-keymap.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/suspend.h> |
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|
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/* When NOT in tablet mode, VGBS returns with the flag 0x40 */ |
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#define TABLET_MODE_FLAG BIT(6) |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Alex Hung"); |
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static const struct acpi_device_id intel_hid_ids[] = { |
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{"INT33D5", 0}, |
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{"INTC1051", 0}, |
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{"INTC1054", 0}, |
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{"", 0}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, intel_hid_ids); |
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|
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/* In theory, these are HID usages. */ |
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static const struct key_entry intel_hid_keymap[] = { |
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/* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */ |
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/* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */ |
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{ KE_KEY, 3, { KEY_NUMLOCK } }, |
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{ KE_KEY, 4, { KEY_HOME } }, |
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{ KE_KEY, 5, { KEY_END } }, |
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{ KE_KEY, 6, { KEY_PAGEUP } }, |
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{ KE_KEY, 7, { KEY_PAGEDOWN } }, |
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{ KE_KEY, 8, { KEY_RFKILL } }, |
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{ KE_KEY, 9, { KEY_POWER } }, |
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{ KE_KEY, 11, { KEY_SLEEP } }, |
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/* 13 has two different meanings in the spec -- ignore it. */ |
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{ KE_KEY, 14, { KEY_STOPCD } }, |
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{ KE_KEY, 15, { KEY_PLAYPAUSE } }, |
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{ KE_KEY, 16, { KEY_MUTE } }, |
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{ KE_KEY, 17, { KEY_VOLUMEUP } }, |
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{ KE_KEY, 18, { KEY_VOLUMEDOWN } }, |
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{ KE_KEY, 19, { KEY_BRIGHTNESSUP } }, |
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{ KE_KEY, 20, { KEY_BRIGHTNESSDOWN } }, |
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/* 27: wake -- needs special handling */ |
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{ KE_END }, |
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}; |
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|
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/* 5 button array notification value. */ |
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static const struct key_entry intel_array_keymap[] = { |
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{ KE_KEY, 0xC2, { KEY_LEFTMETA } }, /* Press */ |
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{ KE_IGNORE, 0xC3, { KEY_LEFTMETA } }, /* Release */ |
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{ KE_KEY, 0xC4, { KEY_VOLUMEUP } }, /* Press */ |
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{ KE_IGNORE, 0xC5, { KEY_VOLUMEUP } }, /* Release */ |
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{ KE_KEY, 0xC6, { KEY_VOLUMEDOWN } }, /* Press */ |
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{ KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* Release */ |
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{ KE_KEY, 0xC8, { KEY_ROTATE_LOCK_TOGGLE } }, /* Press */ |
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{ KE_IGNORE, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } }, /* Release */ |
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{ KE_KEY, 0xCE, { KEY_POWER } }, /* Press */ |
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{ KE_IGNORE, 0xCF, { KEY_POWER } }, /* Release */ |
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{ KE_END }, |
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}; |
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static const struct dmi_system_id button_array_table[] = { |
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{ |
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.ident = "Wacom MobileStudio Pro 13", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 13"), |
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}, |
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}, |
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{ |
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.ident = "Wacom MobileStudio Pro 16", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 16"), |
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}, |
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}, |
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{ |
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.ident = "HP Spectre x2 (2015)", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "HP"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x2 Detachable"), |
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}, |
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}, |
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{ |
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.ident = "Lenovo ThinkPad X1 Tablet Gen 2", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
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DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Tablet Gen 2"), |
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}, |
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}, |
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{ } |
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}; |
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/* |
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* Some convertible use the intel-hid ACPI interface to report SW_TABLET_MODE, |
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* these need to be compared via a DMI based authorization list because some |
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* models have unreliable VGBS return which could cause incorrect |
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* SW_TABLET_MODE report. |
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*/ |
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static const struct dmi_system_id dmi_vgbs_allow_list[] = { |
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{ |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "HP"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x360 Convertible 15-df0xxx"), |
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}, |
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}, |
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{ } |
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}; |
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struct intel_hid_priv { |
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struct input_dev *input_dev; |
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struct input_dev *array; |
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struct input_dev *switches; |
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bool wakeup_mode; |
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}; |
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#define HID_EVENT_FILTER_UUID "eeec56b3-4442-408f-a792-4edd4d758054" |
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enum intel_hid_dsm_fn_codes { |
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INTEL_HID_DSM_FN_INVALID, |
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INTEL_HID_DSM_BTNL_FN, |
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INTEL_HID_DSM_HDMM_FN, |
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INTEL_HID_DSM_HDSM_FN, |
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INTEL_HID_DSM_HDEM_FN, |
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INTEL_HID_DSM_BTNS_FN, |
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INTEL_HID_DSM_BTNE_FN, |
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INTEL_HID_DSM_HEBC_V1_FN, |
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INTEL_HID_DSM_VGBS_FN, |
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INTEL_HID_DSM_HEBC_V2_FN, |
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INTEL_HID_DSM_FN_MAX |
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}; |
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static const char *intel_hid_dsm_fn_to_method[INTEL_HID_DSM_FN_MAX] = { |
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NULL, |
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"BTNL", |
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"HDMM", |
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"HDSM", |
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"HDEM", |
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"BTNS", |
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"BTNE", |
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"HEBC", |
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"VGBS", |
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"HEBC" |
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}; |
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static unsigned long long intel_hid_dsm_fn_mask; |
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static guid_t intel_dsm_guid; |
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static bool intel_hid_execute_method(acpi_handle handle, |
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enum intel_hid_dsm_fn_codes fn_index, |
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unsigned long long arg) |
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{ |
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union acpi_object *obj, argv4, req; |
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acpi_status status; |
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char *method_name; |
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if (fn_index <= INTEL_HID_DSM_FN_INVALID || |
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fn_index >= INTEL_HID_DSM_FN_MAX) |
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return false; |
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method_name = (char *)intel_hid_dsm_fn_to_method[fn_index]; |
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if (!(intel_hid_dsm_fn_mask & BIT(fn_index))) |
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goto skip_dsm_exec; |
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/* All methods expects a package with one integer element */ |
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req.type = ACPI_TYPE_INTEGER; |
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req.integer.value = arg; |
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argv4.type = ACPI_TYPE_PACKAGE; |
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argv4.package.count = 1; |
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argv4.package.elements = &req; |
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obj = acpi_evaluate_dsm(handle, &intel_dsm_guid, 1, fn_index, &argv4); |
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if (obj) { |
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acpi_handle_debug(handle, "Exec DSM Fn code: %d[%s] success\n", |
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fn_index, method_name); |
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ACPI_FREE(obj); |
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return true; |
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} |
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skip_dsm_exec: |
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status = acpi_execute_simple_method(handle, method_name, arg); |
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if (ACPI_SUCCESS(status)) |
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return true; |
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return false; |
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} |
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static bool intel_hid_evaluate_method(acpi_handle handle, |
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enum intel_hid_dsm_fn_codes fn_index, |
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unsigned long long *result) |
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{ |
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union acpi_object *obj; |
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acpi_status status; |
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char *method_name; |
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if (fn_index <= INTEL_HID_DSM_FN_INVALID || |
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fn_index >= INTEL_HID_DSM_FN_MAX) |
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return false; |
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method_name = (char *)intel_hid_dsm_fn_to_method[fn_index]; |
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if (!(intel_hid_dsm_fn_mask & fn_index)) |
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goto skip_dsm_eval; |
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obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid, |
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1, fn_index, |
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NULL, ACPI_TYPE_INTEGER); |
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if (obj) { |
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*result = obj->integer.value; |
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acpi_handle_debug(handle, |
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"Eval DSM Fn code: %d[%s] results: 0x%llx\n", |
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fn_index, method_name, *result); |
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ACPI_FREE(obj); |
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return true; |
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} |
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skip_dsm_eval: |
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status = acpi_evaluate_integer(handle, method_name, NULL, result); |
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if (ACPI_SUCCESS(status)) |
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return true; |
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return false; |
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} |
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static void intel_hid_init_dsm(acpi_handle handle) |
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{ |
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union acpi_object *obj; |
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guid_parse(HID_EVENT_FILTER_UUID, &intel_dsm_guid); |
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obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid, 1, 0, NULL, |
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ACPI_TYPE_BUFFER); |
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if (obj) { |
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switch (obj->buffer.length) { |
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default: |
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case 2: |
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intel_hid_dsm_fn_mask = *(u16 *)obj->buffer.pointer; |
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break; |
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case 1: |
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intel_hid_dsm_fn_mask = *obj->buffer.pointer; |
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break; |
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case 0: |
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acpi_handle_warn(handle, "intel_hid_dsm_fn_mask length is zero\n"); |
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intel_hid_dsm_fn_mask = 0; |
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break; |
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} |
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ACPI_FREE(obj); |
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} |
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acpi_handle_debug(handle, "intel_hid_dsm_fn_mask = %llx\n", |
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intel_hid_dsm_fn_mask); |
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} |
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static int intel_hid_set_enable(struct device *device, bool enable) |
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{ |
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acpi_handle handle = ACPI_HANDLE(device); |
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/* Enable|disable features - power button is always enabled */ |
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if (!intel_hid_execute_method(handle, INTEL_HID_DSM_HDSM_FN, |
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enable)) { |
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dev_warn(device, "failed to %sable hotkeys\n", |
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enable ? "en" : "dis"); |
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return -EIO; |
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} |
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return 0; |
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} |
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static void intel_button_array_enable(struct device *device, bool enable) |
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{ |
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struct intel_hid_priv *priv = dev_get_drvdata(device); |
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acpi_handle handle = ACPI_HANDLE(device); |
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unsigned long long button_cap; |
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acpi_status status; |
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if (!priv->array) |
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return; |
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/* Query supported platform features */ |
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status = acpi_evaluate_integer(handle, "BTNC", NULL, &button_cap); |
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if (ACPI_FAILURE(status)) { |
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dev_warn(device, "failed to get button capability\n"); |
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return; |
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} |
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/* Enable|disable features - power button is always enabled */ |
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if (!intel_hid_execute_method(handle, INTEL_HID_DSM_BTNE_FN, |
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enable ? button_cap : 1)) |
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dev_warn(device, "failed to set button capability\n"); |
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} |
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static int intel_hid_pm_prepare(struct device *device) |
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{ |
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if (device_may_wakeup(device)) { |
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struct intel_hid_priv *priv = dev_get_drvdata(device); |
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priv->wakeup_mode = true; |
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} |
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return 0; |
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} |
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static void intel_hid_pm_complete(struct device *device) |
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{ |
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struct intel_hid_priv *priv = dev_get_drvdata(device); |
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priv->wakeup_mode = false; |
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} |
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static int intel_hid_pl_suspend_handler(struct device *device) |
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{ |
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intel_button_array_enable(device, false); |
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if (!pm_suspend_no_platform()) |
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intel_hid_set_enable(device, false); |
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return 0; |
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} |
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static int intel_hid_pl_resume_handler(struct device *device) |
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{ |
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intel_hid_pm_complete(device); |
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if (!pm_suspend_no_platform()) |
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intel_hid_set_enable(device, true); |
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intel_button_array_enable(device, true); |
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return 0; |
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} |
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static const struct dev_pm_ops intel_hid_pl_pm_ops = { |
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.prepare = intel_hid_pm_prepare, |
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.complete = intel_hid_pm_complete, |
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.freeze = intel_hid_pl_suspend_handler, |
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.thaw = intel_hid_pl_resume_handler, |
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.restore = intel_hid_pl_resume_handler, |
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.suspend = intel_hid_pl_suspend_handler, |
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.resume = intel_hid_pl_resume_handler, |
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}; |
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static int intel_hid_input_setup(struct platform_device *device) |
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{ |
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struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); |
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int ret; |
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priv->input_dev = devm_input_allocate_device(&device->dev); |
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if (!priv->input_dev) |
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return -ENOMEM; |
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ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL); |
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if (ret) |
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return ret; |
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priv->input_dev->name = "Intel HID events"; |
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priv->input_dev->id.bustype = BUS_HOST; |
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return input_register_device(priv->input_dev); |
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} |
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static int intel_button_array_input_setup(struct platform_device *device) |
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{ |
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struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); |
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int ret; |
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/* Setup input device for 5 button array */ |
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priv->array = devm_input_allocate_device(&device->dev); |
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if (!priv->array) |
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return -ENOMEM; |
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ret = sparse_keymap_setup(priv->array, intel_array_keymap, NULL); |
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if (ret) |
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return ret; |
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priv->array->name = "Intel HID 5 button array"; |
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priv->array->id.bustype = BUS_HOST; |
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return input_register_device(priv->array); |
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} |
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static int intel_hid_switches_setup(struct platform_device *device) |
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{ |
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struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); |
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/* Setup input device for switches */ |
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priv->switches = devm_input_allocate_device(&device->dev); |
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if (!priv->switches) |
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return -ENOMEM; |
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__set_bit(EV_SW, priv->switches->evbit); |
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__set_bit(SW_TABLET_MODE, priv->switches->swbit); |
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priv->switches->name = "Intel HID switches"; |
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priv->switches->id.bustype = BUS_HOST; |
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return input_register_device(priv->switches); |
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} |
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static void report_tablet_mode_state(struct platform_device *device) |
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{ |
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struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); |
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acpi_handle handle = ACPI_HANDLE(&device->dev); |
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unsigned long long vgbs; |
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int m; |
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if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_VGBS_FN, &vgbs)) |
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return; |
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m = !(vgbs & TABLET_MODE_FLAG); |
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input_report_switch(priv->switches, SW_TABLET_MODE, m); |
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input_sync(priv->switches); |
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} |
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static bool report_tablet_mode_event(struct input_dev *input_dev, u32 event) |
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{ |
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if (!input_dev) |
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return false; |
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switch (event) { |
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case 0xcc: |
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input_report_switch(input_dev, SW_TABLET_MODE, 1); |
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input_sync(input_dev); |
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return true; |
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case 0xcd: |
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input_report_switch(input_dev, SW_TABLET_MODE, 0); |
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input_sync(input_dev); |
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return true; |
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default: |
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return false; |
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} |
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} |
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static void notify_handler(acpi_handle handle, u32 event, void *context) |
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{ |
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struct platform_device *device = context; |
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struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); |
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unsigned long long ev_index; |
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int err; |
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/* |
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* Some convertible have unreliable VGBS return which could cause incorrect |
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* SW_TABLET_MODE report, in these cases we enable support when receiving |
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* the first event instead of during driver setup. |
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* |
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* Some 360 degree hinges (yoga) style 2-in-1 devices use 2 accelerometers |
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* to allow the OS to determine the angle between the display and the base |
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* of the device. On Windows these are read by a special HingeAngleService |
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* process which calls an ACPI DSM (Device Specific Method) on the |
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* ACPI KIOX010A device node for the sensor in the display, to let the |
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* firmware know if the 2-in-1 is in tablet- or laptop-mode so that it can |
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* disable the kbd and touchpad to avoid spurious input in tablet-mode. |
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* |
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* The linux kxcjk1013 driver calls the DSM for this once at probe time |
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* to ensure that the builtin kbd and touchpad work. On some devices this |
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* causes a "spurious" 0xcd event on the intel-hid ACPI dev. In this case |
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* there is not a functional tablet-mode switch, so we should not register |
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* the tablet-mode switch device. |
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*/ |
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if (!priv->switches && (event == 0xcc || event == 0xcd) && |
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!acpi_dev_present("KIOX010A", NULL, -1)) { |
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dev_info(&device->dev, "switch event received, enable switches supports\n"); |
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err = intel_hid_switches_setup(device); |
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if (err) |
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pr_err("Failed to setup Intel HID switches\n"); |
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} |
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|
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if (priv->wakeup_mode) { |
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/* |
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* Needed for wakeup from suspend-to-idle to work on some |
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* platforms that don't expose the 5-button array, but still |
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* send notifies with the power button event code to this |
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* device object on power button actions while suspended. |
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*/ |
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if (event == 0xce) |
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goto wakeup; |
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|
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/* |
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* Some devices send (duplicate) tablet-mode events when moved |
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* around even though the mode has not changed; and they do this |
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* even when suspended. |
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* Update the switch state in case it changed and then return |
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* without waking up to avoid spurious wakeups. |
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*/ |
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if (event == 0xcc || event == 0xcd) { |
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report_tablet_mode_event(priv->switches, event); |
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return; |
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} |
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|
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/* Wake up on 5-button array events only. */ |
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if (event == 0xc0 || !priv->array) |
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return; |
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|
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if (!sparse_keymap_entry_from_scancode(priv->array, event)) { |
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dev_info(&device->dev, "unknown event 0x%x\n", event); |
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return; |
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} |
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wakeup: |
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pm_wakeup_hard_event(&device->dev); |
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|
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return; |
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} |
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|
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/* |
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* Needed for suspend to work on some platforms that don't expose |
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* the 5-button array, but still send notifies with power button |
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* event code to this device object on power button actions. |
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* |
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* Report the power button press and release. |
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*/ |
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if (!priv->array) { |
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if (event == 0xce) { |
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input_report_key(priv->input_dev, KEY_POWER, 1); |
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input_sync(priv->input_dev); |
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return; |
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} |
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|
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if (event == 0xcf) { |
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input_report_key(priv->input_dev, KEY_POWER, 0); |
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input_sync(priv->input_dev); |
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return; |
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} |
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} |
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|
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if (report_tablet_mode_event(priv->switches, event)) |
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return; |
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|
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/* 0xC0 is for HID events, other values are for 5 button array */ |
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if (event != 0xc0) { |
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if (!priv->array || |
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!sparse_keymap_report_event(priv->array, event, 1, true)) |
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dev_dbg(&device->dev, "unknown event 0x%x\n", event); |
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return; |
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} |
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|
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if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDEM_FN, |
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&ev_index)) { |
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dev_warn(&device->dev, "failed to get event index\n"); |
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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; |
|
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"); |
|
} |
|
|
|
/* Setup switches for devices that we know VGBS return correctly */ |
|
if (dmi_check_system(dmi_vgbs_allow_list)) { |
|
dev_info(&device->dev, "platform supports switches\n"); |
|
err = intel_hid_switches_setup(device); |
|
if (err) |
|
pr_err("Failed to setup Intel HID switches\n"); |
|
else |
|
report_tablet_mode_state(device); |
|
} |
|
|
|
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; |
|
|
|
if (priv->array) { |
|
unsigned long long dummy; |
|
|
|
intel_button_array_enable(&device->dev, true); |
|
|
|
/* Call button load method to enable HID power button */ |
|
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); |
|
/* |
|
* In order for system wakeup to work, the EC GPE has to be marked as |
|
* a wakeup one, so do that here (this setting will persist, but it has |
|
* no effect until the wakeup mask is set for the EC GPE). |
|
*/ |
|
acpi_ec_mark_gpe_for_wake(); |
|
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, |
|
}; |
|
|
|
/* |
|
* 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);
|
|
|