From: Aditya Garg <gargaditya08@xxxxxxxx>
This patch adds support for the switching between the Media and Function
keys on the touchbar by pressing the Fn key on Apple Internal Keyboard.
Signed-off-by: Aditya Garg <gargaditya08@xxxxxxxx>
---
drivers/hid/hid-appletb-kbd.c | 128 ++++++++++++++++++++++++++++++++++
1 file changed, 128 insertions(+)
diff --git a/drivers/hid/hid-appletb-kbd.c b/drivers/hid/hid-appletb-kbd.c
index ecac68fc7..442c4d884 100644
--- a/drivers/hid/hid-appletb-kbd.c
+++ b/drivers/hid/hid-appletb-kbd.c
@@ -26,6 +26,8 @@
#define APPLETB_KBD_MODE_OFF 3
#define APPLETB_KBD_MODE_MAX APPLETB_KBD_MODE_OFF
+#define APPLETB_DEVID_KEYBOARD 1
+
#define HID_USAGE_MODE 0x00ff0004
static int appletb_tb_def_mode = APPLETB_KBD_MODE_SPCL;
@@ -35,11 +37,18 @@ MODULE_PARM_DESC(mode, "Default touchbar mode:\n"
" 1 - function-keys\n"
" [2] - special keys");
+static bool appletb_tb_fn_toggle = true;
+module_param_named(fntoggle, appletb_tb_fn_toggle, bool, 0644);
+MODULE_PARM_DESC(fntoggle, "Switch between Fn and media controls on pressing Fn key");
+
struct appletb_kbd {
struct hid_field *mode_field;
u8 saved_mode;
u8 current_mode;
+ struct input_handler inp_handler;
+ struct input_handle kbd_handle;
+
};
static const struct key_entry appletb_kbd_keymap[] = {
@@ -172,6 +181,75 @@ static int appletb_kbd_hid_event(struct hid_device *hdev, struct hid_field *fiel
return kbd->current_mode == APPLETB_KBD_MODE_OFF;
}
+static void appletb_kbd_inp_event(struct input_handle *handle, unsigned int type,
+ unsigned int code, int value)
+{
+ struct appletb_kbd *kbd = handle->private;
+
+ if (type == EV_KEY && code == KEY_FN && appletb_tb_fn_toggle) {
+ if (value == 1) {
+ kbd->saved_mode = kbd->current_mode;
+ if (kbd->current_mode == APPLETB_KBD_MODE_SPCL)
+ appletb_kbd_set_mode(kbd, APPLETB_KBD_MODE_FN);
+ else if (kbd->current_mode == APPLETB_KBD_MODE_FN)
+ appletb_kbd_set_mode(kbd, APPLETB_KBD_MODE_SPCL);
+ } else if (value == 0) {
+ if (kbd->saved_mode != kbd->current_mode)
+ appletb_kbd_set_mode(kbd, kbd->saved_mode);
+ }
+ }
+}
+
+static int appletb_kbd_inp_connect(struct input_handler *handler,
+ struct input_dev *dev,
+ const struct input_device_id *id)
+{
+ struct appletb_kbd *kbd = handler->private;
+ struct input_handle *handle;
+ int rc;
+
+ if (id->driver_info == APPLETB_DEVID_KEYBOARD) {
+ handle = &kbd->kbd_handle;
+ handle->name = "tbkbd";
+ } else {
+ return -ENOENT;
+ }
+
+ if (handle->dev)
+ return -EEXIST;
+
+ handle->open = 0;
+ handle->dev = input_get_device(dev);
+ handle->handler = handler;
+ handle->private = kbd;
+
+ rc = input_register_handle(handle);
+ if (rc)
+ goto err_free_dev;
+
+ rc = input_open_device(handle);
+ if (rc)
+ goto err_unregister_handle;
+
+ return 0;
+
+ err_unregister_handle:
+ input_unregister_handle(handle);
+ err_free_dev:
+ input_put_device(handle->dev);
+ handle->dev = NULL;
+ return rc;
+}
+
+static void appletb_kbd_inp_disconnect(struct input_handle *handle)
+{
+ input_close_device(handle);
+ input_unregister_handle(handle);
+
+ input_put_device(handle->dev);
+ handle->dev = NULL;
+}
+
static int appletb_kbd_input_configured(struct hid_device *hdev, struct hid_input *hidinput)
{
int idx;
@@ -196,6 +274,40 @@ static int appletb_kbd_input_configured(struct hid_device *hdev, struct hid_inpu
return 0;
}
+static const struct input_device_id appletb_kbd_input_devices[] = {
+ {
+ .flags = INPUT_DEVICE_ID_MATCH_BUS |
+ INPUT_DEVICE_ID_MATCH_VENDOR |
+ INPUT_DEVICE_ID_MATCH_KEYBIT,
+ .bustype = BUS_USB,
+ .vendor = USB_VENDOR_ID_APPLE,
+ .keybit = { [BIT_WORD(KEY_FN)] = BIT_MASK(KEY_FN) },
+ .driver_info = APPLETB_DEVID_KEYBOARD,
+ },
+ { }
+};
+
+static bool appletb_kbd_match_internal_device(struct input_handler *handler,
+ struct input_dev *inp_dev)
+{
+ struct device *dev = &inp_dev->dev;
+
+ /* in kernel: dev && !is_usb_device(dev) */
+ while (dev && !(dev->type && dev->type->name &&
+ !strcmp(dev->type->name, "usb_device")))
+ dev = dev->parent;
+
+ /*
+ * Apple labels all their internal keyboards and trackpads as such,
+ * instead of maintaining an ever expanding list of product-id's we
+ * just look at the device's product name.
+ */
+ if (dev)
+ return !!strstr(to_usb_device(dev)->product, "Internal Keyboard");
+
+ return false;
+}
+
static int appletb_kbd_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
struct appletb_kbd *kbd;
@@ -228,6 +340,20 @@ static int appletb_kbd_probe(struct hid_device *hdev, const struct hid_device_id
goto stop_hw;
}
+ kbd->inp_handler.event = appletb_kbd_inp_event;
+ kbd->inp_handler.connect = appletb_kbd_inp_connect;
+ kbd->inp_handler.disconnect = appletb_kbd_inp_disconnect;
+ kbd->inp_handler.name = "appletb";
+ kbd->inp_handler.id_table = appletb_kbd_input_devices;
+ kbd->inp_handler.match = appletb_kbd_match_internal_device;
+ kbd->inp_handler.private = kbd;
+
+ ret = input_register_handler(&kbd->inp_handler);
+ if (ret) {
+ dev_err_probe(dev, ret, "Unable to register keyboard handler\n");
+ goto close_hw;
+ }
+
ret = appletb_kbd_set_mode(kbd, appletb_tb_def_mode);
if (ret) {
dev_err_probe(dev, ret, "Failed to set touchbar mode\n");
@@ -251,6 +377,8 @@ static void appletb_kbd_remove(struct hid_device *hdev)
appletb_kbd_set_mode(kbd, APPLETB_KBD_MODE_OFF);
+ input_unregister_handler(&kbd->inp_handler);
+
hid_hw_close(hdev);
hid_hw_stop(hdev);
}
--
2.43.0
