HID: google: Add support for vivaldi to hid-hammer

Add support to the hammer driver to parse vivaldi keyboard layouts and
expose them to userspace. This allows hammer devices to use vivaldi
function row keys while also supporting the other features this driver
supports, like the CBAS (chrome base attached switch) and a keyboard
backlight.

Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Tested-by: Stephen Boyd <swboyd@chromium.org> # coachz, wormdingler
Link: https://lore.kernel.org/r/20220228075446.466016-5-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/hid/Kconfig

@@ -412,6 +412,8 @@ config HID_VIVALDI_COMMON
 
 config HID_GOOGLE_HAMMER
 	tristate "Google Hammer Keyboard"
+	select HID_VIVALDI_COMMON
+	select INPUT_VIVALDIFMAP
 	depends on USB_HID && LEDS_CLASS && CROS_EC
 	help
 	Say Y here if you have a Google Hammer device.

drivers/hid/hid-google-hammer.c

@@ -15,6 +15,7 @@
 
 #include <linux/acpi.h>
 #include <linux/hid.h>
+#include <linux/input/vivaldi-fmap.h>
 #include <linux/leds.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -25,6 +26,7 @@
 #include <asm/unaligned.h>
 
 #include "hid-ids.h"
+#include "hid-vivaldi-common.h"
 
 /*
  * C(hrome)B(ase)A(ttached)S(witch) - switch exported by Chrome EC and reporting
@@ -501,8 +503,15 @@ static void hammer_stop(void *hdev)
 static int hammer_probe(struct hid_device *hdev,
 			const struct hid_device_id *id)
 {
+	struct vivaldi_data *vdata;
 	int error;
 
+	vdata = devm_kzalloc(&hdev->dev, sizeof(*vdata), GFP_KERNEL);
+	if (!vdata)
+		return -ENOMEM;
+
+	hid_set_drvdata(hdev, vdata);
+
 	error = hid_parse(hdev);
 	if (error)
 		return error;
@@ -598,6 +607,8 @@ static struct hid_driver hammer_driver = {
 	.id_table = hammer_devices,
 	.probe = hammer_probe,
 	.remove = hammer_remove,
+	.feature_mapping = vivaldi_feature_mapping,
+	.input_configured = vivaldi_input_configured,
 	.input_mapping = hammer_input_mapping,
 	.event = hammer_event,
 };