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Diffstat (limited to 'drivers/platform/x86/dell/dell-wmi-aio.c')
-rw-r--r--drivers/platform/x86/dell/dell-wmi-aio.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/drivers/platform/x86/dell/dell-wmi-aio.c b/drivers/platform/x86/dell/dell-wmi-aio.c
new file mode 100644
index 000000000..c7b7f1e40
--- /dev/null
+++ b/drivers/platform/x86/dell/dell-wmi-aio.c
@@ -0,0 +1,197 @@
+// 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);