From 119844a75ed99e43cd9d0a87f7dfdf4dc438a50f Mon Sep 17 00:00:00 2001
From: Andi Shyti <andi.shyti@samsung.com>
Date: Fri, 17 Feb 2017 17:32:04 +0900
Subject: HID: gearvr: add support for Samsung Gear VR

The Gear VR is a connected through USB to mobile phones and
generates a hidraw device as interface to userspace.

Change-Id: Ib7814fa6f86a034d5ab6fd59120efb8c2392f9bd
Signed-off-by: Andi Shyti <andi.shyti@samsung.com>
---
 drivers/hid/Kconfig      |  6 ++++
 drivers/hid/Makefile     |  1 +
 drivers/hid/hid-core.c   |  1 +
 drivers/hid/hid-gearvr.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 81 insertions(+)
 create mode 100644 drivers/hid/hid-gearvr.c

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 1aeb80e52424..0fe823310e7a 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -310,6 +310,12 @@ config HOLTEK_FF
 	  Say Y here if you have a Holtek On Line Grip based game controller
 	  and want to have force feedback support for it.
 
+config HID_GEARVR
+	tristate "Samsung Gear VR support"
+	depends on USB_HID
+	---help---
+	  Say Y here iy you want support for the USB Samsung Gear VR
+
 config HID_GT683R
 	tristate "MSI GT68xR LED support"
 	depends on LEDS_CLASS && USB_HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 4d111f23e801..66fbf0a40e42 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_HID_EMS_FF)	+= hid-emsff.o
 obj-$(CONFIG_HID_ELECOM)	+= hid-elecom.o
 obj-$(CONFIG_HID_ELO)		+= hid-elo.o
 obj-$(CONFIG_HID_EZKEY)		+= hid-ezkey.o
+obj-$(CONFIG_HID_GEARVR)	+= hid-gearvr.o
 obj-$(CONFIG_HID_GEMBIRD)	+= hid-gembird.o
 obj-$(CONFIG_HID_GFRM)		+= hid-gfrm.o
 obj-$(CONFIG_HID_GT683R)	+= hid-gt683r.o
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 538ff697a4cf..d0350a070cbb 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2044,6 +2044,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
 #endif
 	{ HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD_MOUSE) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG_ELECTRONICS, USB_DEVICE_ID_SAMSUNG_GEARVR_R320) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_SKYCABLE, USB_DEVICE_ID_SKYCABLE_WIRELESS_PRESENTER) },
 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_SMK, USB_DEVICE_ID_SMK_PS3_BDREMOTE) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_BUZZ_CONTROLLER) },
diff --git a/drivers/hid/hid-gearvr.c b/drivers/hid/hid-gearvr.c
new file mode 100644
index 000000000000..09e6459b0c4f
--- /dev/null
+++ b/drivers/hid/hid-gearvr.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd.
+ * Author: Andi Shyti <andi.shyti@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Samsung Gear VR device driver
+ */
+
+#include <linux/hidraw.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+static int gearvr_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	int err;
+
+	err = hid_parse(hdev);
+	if (err)
+		return err;
+
+	err = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (err)
+		return err;
+
+	err = hid_hw_power(hdev, PM_HINT_FULLON);
+	if (err < 0)
+		goto fail_dev_stop;
+
+	err = hid_hw_open(hdev);
+	if (err < 0)
+		goto fail_power_off;
+
+	return 0;
+
+fail_power_off:
+	hid_hw_power(hdev, PM_HINT_NORMAL);
+fail_dev_stop:
+	hid_hw_stop(hdev);
+
+	return err;
+}
+
+static void gearvr_remove(struct hid_device *hdev)
+{
+	hid_hw_close(hdev);
+	hid_hw_power(hdev, PM_HINT_NORMAL);
+	hid_hw_stop(hdev);
+}
+
+static const struct hid_device_id gearvr_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG_ELECTRONICS,
+			USB_DEVICE_ID_SAMSUNG_GEARVR_R320) },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(hid, gearvr_devices);
+
+static struct hid_driver gearvr_driver = {
+	.name = "gearvr",
+	.id_table = gearvr_devices,
+	.probe = gearvr_probe,
+	.remove = gearvr_remove,
+};
+
+module_hid_driver(gearvr_driver);
+
+MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
+MODULE_DESCRIPTION("Samsung Gear VR device driver");
+MODULE_LICENSE("GPL v2");
-- 
cgit v1.2.3