hid: Driver for Nvidia Shield joystick

In order to customize the flat and fuzz of the
joystick, create an separate hid driver for
Shield joystick. It does the same hid mapping
with hid-input.c but only changes the flat and
fuzz configurations.

Bug 1352488

Change-Id: Ide6d37eeeffac9a7150fb257d30f348599794c4c
Signed-off-by: Jun Yan <juyan@nvidia.com>
Reviewed-on: http://git-master/r/335198
Reviewed-by: Anshul Jain (SW) <anshulj@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Raymond Poudrier <rapoudrier@nvidia.com>

5 files changed, 98 insertions, 0 deletions

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index fb52f3f6de80..0f0f885f471a 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -454,6 +454,16 @@ config HID_NTRIG
 	---help---
 	Support for N-Trig touch screen.
 
+config HID_NVIDIA
+	tristate "NVIDIA game controller"
+	depends on USB_HID
+	---help---
+	Support for NVIDIA game controllers. To improve gaming experience, NVIDIA controller
+	has customized axis flat and fuzz values.
+	Supported devices:
+
+	   - NVIDIA Shield Handheld game console.
+
 config HID_ORTEK
 	tristate "Ortek PKB-1700/WKB-2000/Skycable wireless keyboard and mouse trackpad"
 	depends on HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 2065694f57ab..4d1cce738bcc 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -117,6 +117,7 @@ obj-$(CONFIG_HID_WACOM)		+= hid-wacom.o
 obj-$(CONFIG_HID_WALTOP)	+= hid-waltop.o
 obj-$(CONFIG_HID_WIIMOTE)	+= hid-wiimote.o
 obj-$(CONFIG_HID_SENSOR_HUB)	+= hid-sensor-hub.o
+obj-$(CONFIG_HID_NVIDIA)	+= hid-nvidia.o
 
 obj-$(CONFIG_USB_HID)		+= usbhid/
 obj-$(CONFIG_USB_MOUSE)		+= usbhid/
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index e04bf0ef93a9..e89a54cbfbb0 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1745,6 +1745,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_16) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_17) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_18) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_NVIDIA, USB_DEVICE_ID_NVIDIA_LOKI) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ORTEK, USB_DEVICE_ID_ORTEK_PKB1700) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ORTEK, USB_DEVICE_ID_ORTEK_WKB2000) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_PETALYNX, USB_DEVICE_ID_PETALYNX_MAXTER_REMOTE) },
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 114fd1661834..be4eb9cb7de9 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -648,6 +648,9 @@
 #define USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_18   0x0014
 #define USB_DEVICE_ID_NTRIG_DUOSENSE 0x1500
 
+#define USB_VENDOR_ID_NVIDIA		0x0955
+#define USB_DEVICE_ID_NVIDIA_LOKI	0x7205
+
 #define USB_VENDOR_ID_ONTRAK		0x0a07
 #define USB_DEVICE_ID_ONTRAK_ADU100	0x0064
 
diff --git a/drivers/hid/hid-nvidia.c b/drivers/hid/hid-nvidia.c
new file mode 100644
index 000000000000..29a4ae2a4a16
--- /dev/null
+++ b/drivers/hid/hid-nvidia.c
@@ -0,0 +1,83 @@
+/*
+ * HID driver for NVIDIA Shield Joystick
+ *
+ * Copyright (c) 2013, NVIDIA Corporation. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include "hid-ids.h"
+
+#define JOYSTICK_FUZZ 64
+#define TRIGGER_FUZZ 64
+#define JOYSTICK_FLAT 64
+#define TRIGGER_FLAT 0
+
+static int nvidia_input_mapped(struct hid_device *hdev, struct hid_input *hi,
+			      struct hid_field *field, struct hid_usage *usage,
+			      unsigned long **bit, int *max)
+{
+	int a = field->logical_minimum;
+	int b = field->logical_maximum;
+	int fuzz;
+	int flat;
+
+	if ((usage->type == EV_ABS) && (field->application == HID_GD_GAMEPAD
+			|| field->application == HID_GD_JOYSTICK)) {
+		switch (usage->hid) {
+		case HID_GD_X:
+		case HID_GD_Y:
+		case HID_GD_RX:
+		case HID_GD_RY:
+			fuzz = JOYSTICK_FUZZ;
+			flat = JOYSTICK_FLAT;
+			break;
+		case HID_GD_Z:
+		case HID_GD_RZ:
+			fuzz = TRIGGER_FUZZ;
+			flat = TRIGGER_FLAT;
+			break;
+		default: return 0;/*Use generic mapping for HatX, HatY*/
+		}
+		set_bit(usage->type, hi->input->evbit);
+		set_bit(usage->code, *bit);
+		input_set_abs_params(hi->input, usage->code, a, b, fuzz, flat);
+		input_abs_set_res(hi->input, usage->code,
+			hidinput_calc_abs_res(field, usage->code));
+		return -1;
+	}
+
+	return 0;
+}
+
+static const struct hid_device_id nvidia_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_NVIDIA, USB_DEVICE_ID_NVIDIA_LOKI) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, loki_devices);
+
+static struct hid_driver nvidia_driver = {
+	.name = "hid-nvidia",
+	.id_table = nvidia_devices,
+	.input_mapped = nvidia_input_mapped,
+};
+module_hid_driver(nvidia_driver);
+
+MODULE_AUTHOR("Jun Yan <juyan@nvidia.com>");
+MODULE_LICENSE("GPL");