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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | // SPDX-License-Identifier: GPL-2.0-or-later /* * WMI hotkeys support for Dell All-In-One series */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/input.h> #include <linux/input/sparse-keymap.h> #include <linux/acpi.h> #include <linux/string.h> MODULE_DESCRIPTION("WMI hotkeys driver for Dell All-In-One series"); MODULE_LICENSE("GPL"); #define EVENT_GUID1 "284A0E6B-380E-472A-921F-E52786257FB4" #define EVENT_GUID2 "02314822-307C-4F66-BF0E-48AEAEB26CC8" struct dell_wmi_event { u16 length; /* 0x000: A hot key pressed or an event occurred * 0x00F: A sequence of hot keys are pressed */ u16 type; u16 event[]; }; static const char *dell_wmi_aio_guids[] = { EVENT_GUID1, EVENT_GUID2, NULL }; MODULE_ALIAS("wmi:"EVENT_GUID1); MODULE_ALIAS("wmi:"EVENT_GUID2); static const struct key_entry dell_wmi_aio_keymap[] = { { KE_KEY, 0xc0, { KEY_VOLUMEUP } }, { KE_KEY, 0xc1, { KEY_VOLUMEDOWN } }, { KE_KEY, 0xe030, { KEY_VOLUMEUP } }, { KE_KEY, 0xe02e, { KEY_VOLUMEDOWN } }, { KE_KEY, 0xe020, { KEY_MUTE } }, { KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } }, { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } }, { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } }, { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } }, { KE_END, 0 } }; static struct input_dev *dell_wmi_aio_input_dev; /* * The new WMI event data format will follow the dell_wmi_event structure * So, we will check if the buffer matches the format */ static bool dell_wmi_aio_event_check(u8 *buffer, int length) { struct dell_wmi_event *event = (struct dell_wmi_event *)buffer; if (event == NULL || length < 6) return false; if ((event->type == 0 || event->type == 0xf) && event->length >= 2) return true; return false; } static void dell_wmi_aio_notify(u32 value, void *context) { struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; struct dell_wmi_event *event; acpi_status status; status = wmi_get_event_data(value, &response); if (status != AE_OK) { pr_info("bad event status 0x%x\n", status); return; } obj = (union acpi_object *)response.pointer; if (obj) { unsigned int scancode = 0; switch (obj->type) { case ACPI_TYPE_INTEGER: /* Most All-In-One correctly return integer scancode */ scancode = obj->integer.value; sparse_keymap_report_event(dell_wmi_aio_input_dev, scancode, 1, true); break; case ACPI_TYPE_BUFFER: if (dell_wmi_aio_event_check(obj->buffer.pointer, obj->buffer.length)) { event = (struct dell_wmi_event *) obj->buffer.pointer; scancode = event->event[0]; } else { /* Broken machines return the scancode in a buffer */ if (obj->buffer.pointer && obj->buffer.length > 0) scancode = obj->buffer.pointer[0]; } if (scancode) sparse_keymap_report_event( dell_wmi_aio_input_dev, scancode, 1, true); break; } } kfree(obj); } static int __init dell_wmi_aio_input_setup(void) { int err; dell_wmi_aio_input_dev = input_allocate_device(); if (!dell_wmi_aio_input_dev) return -ENOMEM; dell_wmi_aio_input_dev->name = "Dell AIO WMI hotkeys"; dell_wmi_aio_input_dev->phys = "wmi/input0"; dell_wmi_aio_input_dev->id.bustype = BUS_HOST; err = sparse_keymap_setup(dell_wmi_aio_input_dev, dell_wmi_aio_keymap, NULL); if (err) { pr_err("Unable to setup input device keymap\n"); goto err_free_dev; } err = input_register_device(dell_wmi_aio_input_dev); if (err) { pr_info("Unable to register input device\n"); goto err_free_dev; } return 0; err_free_dev: input_free_device(dell_wmi_aio_input_dev); return err; } static const char *dell_wmi_aio_find(void) { int i; for (i = 0; dell_wmi_aio_guids[i] != NULL; i++) if (wmi_has_guid(dell_wmi_aio_guids[i])) return dell_wmi_aio_guids[i]; return NULL; } static int __init dell_wmi_aio_init(void) { int err; const char *guid; guid = dell_wmi_aio_find(); if (!guid) { pr_warn("No known WMI GUID found\n"); return -ENXIO; } err = dell_wmi_aio_input_setup(); if (err) return err; err = wmi_install_notify_handler(guid, dell_wmi_aio_notify, NULL); if (err) { pr_err("Unable to register notify handler - %d\n", err); input_unregister_device(dell_wmi_aio_input_dev); return err; } return 0; } static void __exit dell_wmi_aio_exit(void) { const char *guid; guid = dell_wmi_aio_find(); wmi_remove_notify_handler(guid); input_unregister_device(dell_wmi_aio_input_dev); } module_init(dell_wmi_aio_init); module_exit(dell_wmi_aio_exit); |