Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
To:     Jiri Kosina <jikos@kernel.org>,
        Benjamin Tissoires <benjamin.tissoires@redhat.com>,
        "Pierre-Loup A. Griffais" <pgriffais@valvesoftware.com>,
        Cameron Gutman <aicommander@gmail.com>,
        =?UTF-8?q?Cl=C3=A9ment=20VUCHENER?= <clement.vuchener@gmail.com>,
        linux-kernel@vger.kernel.org, linux-input@vger.kernel.org
Cc:     Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
Subject: [PATCH v3 1/3] HID: add driver for Valve Steam Controller
Date:   Sun, 25 Feb 2018 19:52:48 +0100
Message-Id: <20180225185250.10759-2-rodrigorivascosta@gmail.com>
In-Reply-To: <20180225185250.10759-1-rodrigorivascosta@gmail.com>
References: <20180225185250.10759-1-rodrigorivascosta@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

There are two ways to connect the Steam Controller: directly to the USB
or with the USB wireless adapter.  Both methods are similar, but the
wireless adapter can connect up to 4 devices at the same time.

The wired device will appear as 3 interfaces: a virtual mouse, a virtual
keyboard and a custom HID device.

The wireless device will appear as 5 interfaces: a virtual keyboard and
4 custom HID devices, that will remain silent until a device is actually
connected.

The custom HID device has a report descriptor with all vendor specific
usages, so the hid-generic is not very useful. In a PC/SteamBox Valve
Steam Client provices a software translation by using direct USB access
and a creates a uinput virtual gamepad.

This driver was reverse engineered to provide direct kernel support in
case you cannot, or do not want to, use Valve Steam Client. It disables
the virtual keyboard and mouse, as they are not so useful when you have
a working gamepad.

Working: buttons, axes, pads, wireless connect/disconnect.

TO-DO: Battery, force-feedback, accelerometer/gyro, led, beeper...

Signed-off-by: Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
---
 drivers/hid/Kconfig     |   8 +
 drivers/hid/Makefile    |   1 +
 drivers/hid/hid-ids.h   |   4 +
 drivers/hid/hid-steam.c | 539 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 552 insertions(+)
 create mode 100644 drivers/hid/hid-steam.c

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 19c499f5623d..6e80fbf04e03 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -823,6 +823,14 @@ config HID_SPEEDLINK
 	---help---
 	Support for Speedlink Vicious and Divine Cezanne mouse.
 
+config HID_STEAM
+	tristate "Steam Controller support"
+	depends on HID
+	---help---
+	Say Y here if you have a Steam Controller if you want to use it
+	without running the Steam Client. It supports both the wired and
+	the wireless adaptor.
+
 config HID_STEELSERIES
 	tristate "Steelseries SRW-S1 steering wheel support"
 	depends on HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index eb13b9e92d85..60a8abf84682 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -95,6 +95,7 @@ obj-$(CONFIG_HID_SAMSUNG)	+= hid-samsung.o
 obj-$(CONFIG_HID_SMARTJOYPLUS)	+= hid-sjoy.o
 obj-$(CONFIG_HID_SONY)		+= hid-sony.o
 obj-$(CONFIG_HID_SPEEDLINK)	+= hid-speedlink.o
+obj-$(CONFIG_HID_STEAM)		+= hid-steam.o
 obj-$(CONFIG_HID_STEELSERIES)	+= hid-steelseries.o
 obj-$(CONFIG_HID_SUNPLUS)	+= hid-sunplus.o
 obj-$(CONFIG_HID_GREENASIA)	+= hid-gaff.o
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 43ddcdfbd0da..be31a3c20818 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -988,6 +988,10 @@
 #define USB_VENDOR_ID_STANTUM_SITRONIX		0x1403
 #define USB_DEVICE_ID_MTP_SITRONIX		0x5001
 
+#define USB_VENDOR_ID_VALVE			0x28de
+#define USB_DEVICE_ID_STEAM_CONTROLLER		0x1102
+#define USB_DEVICE_ID_STEAM_CONTROLLER_WIRELESS	0x1142
+
 #define USB_VENDOR_ID_STEELSERIES	0x1038
 #define USB_DEVICE_ID_STEELSERIES_SRWS1	0x1410
 
diff --git a/drivers/hid/hid-steam.c b/drivers/hid/hid-steam.c
new file mode 100644
index 000000000000..59dbcb95f349
--- /dev/null
+++ b/drivers/hid/hid-steam.c
@@ -0,0 +1,539 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * HID driver for Valve Steam Controller
+ *
+ * Copyright (c) 2018 Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
+ *
+ * Supports both the wired and wireless interfaces.
+ *
+ * For additional functions, such as disabling the virtual mouse/keyboard or
+ * changing the right-pad margin you can use the user-space tool at:
+ *
+ *   https://github.com/rodrigorc/steamctrl
+ */
+
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include "hid-ids.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>");
+
+#define STEAM_QUIRK_WIRELESS		BIT(0)
+
+/* Touch pads are 40 mm in diameter and 65535 units */
+#define STEAM_PAD_RESOLUTION 1638
+/* Trigger runs are about 5 mm and 256 units */
+#define STEAM_TRIGGER_RESOLUTION 51
+/* Joystick runs are about 5 mm and 256 units */
+#define STEAM_JOYSTICK_RESOLUTION 51
+
+#define STEAM_PAD_FUZZ 128
+
+struct steam_device {
+	spinlock_t lock;
+	struct hid_device *hdev;
+	struct input_dev __rcu *input;
+	unsigned long quirks;
+	struct work_struct work_connect;
+	bool connected;
+};
+
+static int steam_input_open(struct input_dev *dev)
+{
+	struct steam_device *steam = input_get_drvdata(dev);
+
+	return hid_hw_open(steam->hdev);
+}
+
+static void steam_input_close(struct input_dev *dev)
+{
+	struct steam_device *steam = input_get_drvdata(dev);
+
+	hid_hw_close(steam->hdev);
+}
+
+static int steam_register(struct steam_device *steam)
+{
+	struct hid_device *hdev = steam->hdev;
+	struct input_dev *input;
+	int ret;
+
+	rcu_read_lock();
+	input = rcu_dereference(steam->input);
+	rcu_read_unlock();
+	if (input) {
+		dbg_hid("%s: already connected\n", __func__);
+		return -ENODEV;
+	}
+
+	hid_info(hdev, "Steam Controller connected");
+
+	input = input_allocate_device();
+	if (!input)
+		return -ENOMEM;
+
+	input_set_drvdata(input, steam);
+	input->dev.parent = &hdev->dev;
+	input->open = steam_input_open;
+	input->close = steam_input_close;
+
+	input->name = (steam->quirks & STEAM_QUIRK_WIRELESS) ?
+		"Wireless Steam Controller" :
+		"Steam Controller";
+	input->phys = hdev->phys;
+	input->uniq = hdev->uniq;
+	input->id.bustype = hdev->bus;
+	input->id.vendor = hdev->vendor;
+	input->id.product = hdev->product;
+	input->id.version = hdev->version;
+
+	input_set_capability(input, EV_KEY, BTN_TR2);
+	input_set_capability(input, EV_KEY, BTN_TL2);
+	input_set_capability(input, EV_KEY, BTN_TR);
+	input_set_capability(input, EV_KEY, BTN_TL);
+	input_set_capability(input, EV_KEY, BTN_Y);
+	input_set_capability(input, EV_KEY, BTN_B);
+	input_set_capability(input, EV_KEY, BTN_X);
+	input_set_capability(input, EV_KEY, BTN_A);
+	input_set_capability(input, EV_KEY, BTN_SELECT);
+	input_set_capability(input, EV_KEY, BTN_MODE);
+	input_set_capability(input, EV_KEY, BTN_START);
+	input_set_capability(input, EV_KEY, BTN_GEAR_DOWN);
+	input_set_capability(input, EV_KEY, BTN_GEAR_UP);
+	input_set_capability(input, EV_KEY, BTN_THUMBR);
+	input_set_capability(input, EV_KEY, BTN_THUMBL);
+
+	input_set_abs_params(input, ABS_Z, 0, 255, 0, 0);
+	input_set_abs_params(input, ABS_RZ, 0, 255, 0, 0);
+	input_set_abs_params(input, ABS_X, -32767, 32767, 0, 0);
+	input_set_abs_params(input, ABS_Y, -32767, 32767, 0, 0);
+	input_set_abs_params(input, ABS_RX, -32767, 32767,
+			STEAM_PAD_FUZZ, 0);
+	input_set_abs_params(input, ABS_RY, -32767, 32767,
+			STEAM_PAD_FUZZ, 0);
+	input_set_abs_params(input, ABS_HAT1X, -32767, 32767,
+			STEAM_PAD_FUZZ, 0);
+	input_set_abs_params(input, ABS_HAT1Y, -32767, 32767,
+			STEAM_PAD_FUZZ, 0);
+	input_set_abs_params(input, ABS_HAT0X, -1, 1, 0, 0);
+	input_set_abs_params(input, ABS_HAT0Y, -1, 1, 0, 0);
+	input_abs_set_res(input, ABS_X, STEAM_JOYSTICK_RESOLUTION);
+	input_abs_set_res(input, ABS_Y, STEAM_JOYSTICK_RESOLUTION);
+	input_abs_set_res(input, ABS_RX, STEAM_PAD_RESOLUTION);
+	input_abs_set_res(input, ABS_RY, STEAM_PAD_RESOLUTION);
+	input_abs_set_res(input, ABS_HAT1X, STEAM_PAD_RESOLUTION);
+	input_abs_set_res(input, ABS_HAT1Y, STEAM_PAD_RESOLUTION);
+	input_abs_set_res(input, ABS_Z, STEAM_TRIGGER_RESOLUTION);
+	input_abs_set_res(input, ABS_RZ, STEAM_TRIGGER_RESOLUTION);
+
+	ret = input_register_device(input);
+	if (ret)
+		goto input_register_fail;
+
+	rcu_assign_pointer(steam->input, input);
+
+	return 0;
+
+input_register_fail:
+	input_free_device(input);
+	return ret;
+}
+
+static void steam_unregister(struct steam_device *steam)
+{
+	struct input_dev *input;
+
+	rcu_read_lock();
+	input = rcu_dereference(steam->input);
+	rcu_read_unlock();
+
+	if (input) {
+		RCU_INIT_POINTER(steam->input, NULL);
+		synchronize_rcu();
+		hid_info(steam->hdev, "Steam Controller disconnected");
+		input_unregister_device(input);
+	}
+}
+
+static void steam_work_connect_cb(struct work_struct *work)
+{
+	struct steam_device *steam = container_of(work, struct steam_device,
+							work_connect);
+	unsigned long flags;
+	bool connected;
+	int ret;
+
+	spin_lock_irqsave(&steam->lock, flags);
+	connected = steam->connected;
+	spin_unlock_irqrestore(&steam->lock, flags);
+
+	if (connected) {
+		ret = steam_register(steam);
+		if (ret) {
+			hid_err(steam->hdev,
+				"%s:steam_register failed with error %d\n",
+				__func__, ret);
+			return;
+		}
+	} else {
+		steam_unregister(steam);
+	}
+}
+
+static bool steam_is_valve_interface(struct hid_device *hdev)
+{
+	struct hid_report_enum *rep_enum;
+	struct hid_report *hreport;
+
+	/*
+	 * The wired device creates 3 interfaces:
+	 *  0: emulated mouse.
+	 *  1: emulated keyboard.
+	 *  2: the real game pad.
+	 * The wireless device creates 5 interfaces:
+	 *  0: emulated keyboard.
+	 *  1-4: slots where up to 4 real game pads will be connected to.
+	 * We know which one is the real gamepad interface because they are the
+	 * only ones with a feature report.
+	 */
+	rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
+	list_for_each_entry(hreport, &rep_enum->report_list, list) {
+		/* should we check hreport->id == 0? */
+		return true;
+	}
+	return false;
+}
+
+static int steam_probe(struct hid_device *hdev,
+				const struct hid_device_id *id)
+{
+	struct steam_device *steam;
+	int ret;
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		hid_err(hdev,
+			"%s:parse of hid interface failed\n", __func__);
+		return ret;
+	}
+
+	/*
+	 * Connect the HID device so that Steam Controller keeps on working
+	 * without changes.
+	 */
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (ret) {
+		hid_err(hdev,
+			"%s:hid_hw_start failed with error %d\n",
+			__func__, ret);
+		return ret;
+	}
+
+	if (!steam_is_valve_interface(hdev))
+		return 0;
+
+	/*
+	 * From this point on, if anything fails return 0 and ignores
+	 * the error, so that the default HID devices are still bound.
+	 */
+	steam = devm_kzalloc(&hdev->dev,
+			sizeof(struct steam_device), GFP_KERNEL);
+	if (!steam) {
+		ret = -ENOMEM;
+		goto mem_fail;
+	}
+
+	spin_lock_init(&steam->lock);
+	steam->hdev = hdev;
+	hid_set_drvdata(hdev, steam);
+	steam->quirks = id->driver_data;
+	INIT_WORK(&steam->work_connect, steam_work_connect_cb);
+
+	if (steam->quirks & STEAM_QUIRK_WIRELESS) {
+		ret = hid_hw_open(hdev);
+		if (ret) {
+			hid_err(hdev,
+				"%s:hid_hw_open for wireless\n",
+				__func__);
+			goto hid_hw_open_fail;
+		}
+		hid_info(hdev, "Steam wireless receiver connected");
+	} else {
+		ret = steam_register(steam);
+		if (ret) {
+			hid_err(hdev,
+				"%s:steam_register failed with error %d\n",
+				__func__, ret);
+			goto input_register_fail;
+		}
+	}
+
+	return 0;
+
+input_register_fail:
+hid_hw_open_fail:
+	cancel_work_sync(&steam->work_connect);
+	hid_set_drvdata(hdev, NULL);
+mem_fail:
+	hid_err(hdev, "%s: failed with error %d\n",
+			__func__, ret);
+	return 0;
+}
+
+static void steam_remove(struct hid_device *hdev)
+{
+	struct steam_device *steam = hid_get_drvdata(hdev);
+
+	if (steam && (steam->quirks & STEAM_QUIRK_WIRELESS)) {
+		hid_info(hdev, "Steam wireless receiver disconnected");
+		hid_hw_close(hdev);
+	}
+
+	hid_hw_stop(hdev);
+
+	if (steam) {
+		cancel_work_sync(&steam->work_connect);
+		steam_unregister(steam);
+		hid_set_drvdata(hdev, NULL);
+	}
+}
+
+static void steam_do_connect_event(struct steam_device *steam, bool connected)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&steam->lock, flags);
+	steam->connected = connected;
+	spin_unlock_irqrestore(&steam->lock, flags);
+
+	if (schedule_work(&steam->work_connect) == 0)
+		dbg_hid("%s: connected=%d event already queued\n",
+				__func__, connected);
+}
+
+/*
+ * The size for this message payload is 60.
+ * The known values are:
+ *  (* values are not sent through wireless)
+ *  (* accelerator/gyro is disabled by default)
+ *  Offset| Type  | Mapped to |Meaning
+ * -------+-------+-----------+--------------------------
+ *  4-7   | u32   | --        | sequence number
+ *  8-10  | 24bit | see below | buttons
+ *  11    | u8    | ABS_Z     | left trigger
+ *  12    | u8    | ABS_RZ    | right trigger
+ *  13-15 | --    | --        | always 0
+ *  16-17 | s16   | ABS_X     | X value
+ *  18-19 | s16   | ABS_Y     | Y value
+ *  20-21 | s16   | ABS_RX    | right-pad X value
+ *  22-23 | s16   | ABS_RY    | right-pad Y value
+ *  24-25 | s16   | --        | * left trigger
+ *  26-27 | s16   | --        | * right trigger
+ *  28-29 | s16   | --        | * accelerometer X value
+ *  30-31 | s16   | --        | * accelerometer Y value
+ *  32-33 | s16   | --        | * accelerometer Z value
+ *  34-35 | s16   | --        | gyro X value
+ *  36-36 | s16   | --        | gyro Y value
+ *  38-39 | s16   | --        | gyro Z value
+ *  40-41 | s16   | --        | quaternion W value
+ *  42-43 | s16   | --        | quaternion X value
+ *  44-45 | s16   | --        | quaternion Y value
+ *  46-47 | s16   | --        | quaternion Z value
+ *  48-49 | --    | --        | always 0
+ *  50-51 | s16   | --        | * left trigger (uncalibrated)
+ *  52-53 | s16   | --        | * right trigger (uncalibrated)
+ *  54-55 | s16   | --        | * joystick X value (uncalibrated)
+ *  56-57 | s16   | --        | * joystick Y value (uncalibrated)
+ *  58-59 | s16   | --        | * left-pad X value
+ *  60-61 | s16   | --        | * left-pad Y value
+ *  62-63 | u16   | --        | * battery voltage
+ *
+ * The buttons are:
+ *  Bit  | Mapped to  | Description
+ * ------+------------+--------------------------------
+ *  8.0  | BTN_TR2    | right trigger fully pressed
+ *  8.1  | BTN_TL2    | left trigger fully pressed
+ *  8.2  | BTN_TR     | right shoulder
+ *  8.3  | BTN_TL     | left shoulder
+ *  8.4  | BTN_Y      | button Y
+ *  8.5  | BTN_B      | button B
+ *  8.6  | BTN_X      | button X
+ *  8.7  | BTN_A      | button A
+ *  9.0  | -ABS_HAT0Y | lef-pad up
+ *  9.1  | +ABS_HAT0X | lef-pad right
+ *  9.2  | -ABS_HAT0X | lef-pad left
+ *  9.3  | +ABS_HAT0Y | lef-pad down
+ *  9.4  | BTN_SELECT | menu left
+ *  9.5  | BTN_MODE   | steam logo
+ *  9.6  | BTN_START  | menu right
+ *  9.7  | BTN_GEAR_DOWN | left back lever
+ * 10.0  | BTN_GEAR_UP   | right back lever
+ * 10.1  | --         | left-pad clicked
+ * 10.2  | BTN_THUMBR | right-pad clicked
+ * 10.3  | --         | left-pad touched (but see explanation below)
+ * 10.4  | --         | right-pad touched
+ * 10.5  | --         | unknown
+ * 10.6  | BTN_THUMBL | joystick clicked
+ * 10.7  | --         | lpad_and_joy
+ */
+
+static void steam_do_input_event(struct steam_device *steam,
+		struct input_dev *input, u8 *data)
+{
+	/* 24 bits of buttons */
+	u8 b8, b9, b10;
+	bool lpad_touched, lpad_and_joy;
+
+	b8 = data[8];
+	b9 = data[9];
+	b10 = data[10];
+
+	input_report_abs(input, ABS_Z, data[11]);
+	input_report_abs(input, ABS_RZ, data[12]);
+
+	/*
+	 * These two bits tells how to interpret the values X and Y.
+	 * lpad_and_joy tells that the joystick and the lpad are used at the
+	 * same time.
+	 * lpad_touched tells whether X/Y are to be read as lpad coord or
+	 * joystick values.
+	 * (lpad_touched || lpad_and_joy) tells if the lpad is really touched.
+	 */
+	lpad_touched = b10 & 0x08;
+	lpad_and_joy = b10 & 0x80;
+	input_report_abs(input, lpad_touched ? ABS_HAT1X : ABS_X,
+			(s16) le16_to_cpup((__le16 *)(data + 16)));
+	input_report_abs(input, lpad_touched ? ABS_HAT1Y : ABS_Y,
+			-(s16) le16_to_cpup((__le16 *)(data + 18)));
+	/* Check if joystick is centered */
+	if (lpad_touched && !lpad_and_joy) {
+		input_report_abs(input, ABS_X, 0);
+		input_report_abs(input, ABS_Y, 0);
+	}
+	/* Check if lpad is untouched */
+	if (!(lpad_touched || lpad_and_joy)) {
+		input_report_abs(input, ABS_HAT1X, 0);
+		input_report_abs(input, ABS_HAT1Y, 0);
+	}
+
+	input_report_abs(input, ABS_RX,
+			(s16) le16_to_cpup((__le16 *)(data + 20)));
+	input_report_abs(input, ABS_RY,
+			-(s16) le16_to_cpup((__le16 *)(data + 22)));
+
+	input_event(input, EV_KEY, BTN_TR2, !!(b8 & 0x01));
+	input_event(input, EV_KEY, BTN_TL2, !!(b8 & 0x02));
+	input_event(input, EV_KEY, BTN_TR, !!(b8 & 0x04));
+	input_event(input, EV_KEY, BTN_TL, !!(b8 & 0x08));
+	input_event(input, EV_KEY, BTN_Y, !!(b8 & 0x10));
+	input_event(input, EV_KEY, BTN_B, !!(b8 & 0x20));
+	input_event(input, EV_KEY, BTN_X, !!(b8 & 0x40));
+	input_event(input, EV_KEY, BTN_A, !!(b8 & 0x80));
+	input_event(input, EV_KEY, BTN_SELECT, !!(b9 & 0x10));
+	input_event(input, EV_KEY, BTN_MODE, !!(b9 & 0x20));
+	input_event(input, EV_KEY, BTN_START, !!(b9 & 0x40));
+	input_event(input, EV_KEY, BTN_GEAR_DOWN, !!(b9 & 0x80));
+	input_event(input, EV_KEY, BTN_GEAR_UP, !!(b10 & 0x01));
+	input_event(input, EV_KEY, BTN_THUMBR, !!(b10 & 0x04));
+	input_event(input, EV_KEY, BTN_THUMBL, !!(b10 & 0x40));
+
+	input_report_abs(input, ABS_HAT0X,
+			!!(b9 & 0x02) - !!(b9 & 0x04));
+	input_report_abs(input, ABS_HAT0Y,
+			!!(b9 & 0x08) - !!(b9 & 0x01));
+
+	input_sync(input);
+}
+
+static int steam_raw_event(struct hid_device *hdev,
+			struct hid_report *report, u8 *data,
+			int size)
+{
+	struct steam_device *steam = hid_get_drvdata(hdev);
+	struct input_dev *input;
+
+	if (!steam)
+		return 0;
+
+	/*
+	 * All messages are size=64, all values little-endian.
+	 * The format is:
+	 *  Offset| Meaning
+	 * -------+--------------------------------------------
+	 *  0-1   | always 0x01, 0x00, maybe protocol version?
+	 *  2     | type of message
+	 *  3     | length of the real payload (not checked)
+	 *  4-n   | payload data, depends on the type
+	 *
+	 * There are these known types of message:
+	 *  0x01: input data (60 bytes)
+	 *  0x03: wireless connect/disconnect (1 byte)
+	 *  0x04: battery status (11 bytes)
+	 */
+
+	if (size != 64 || data[0] != 1 || data[1] != 0)
+		return 0;
+
+	switch (data[2]) {
+	case 0x01:
+		rcu_read_lock();
+		input = rcu_dereference(steam->input);
+		if (likely(input)) {
+			steam_do_input_event(steam, input, data);
+		} else {
+			dbg_hid("%s: input data without connect event\n",
+					__func__);
+			steam_do_connect_event(steam, true);
+		}
+		rcu_read_unlock();
+		break;
+	case 0x03:
+		/*
+		 * The payload of this event is a single byte:
+		 *  0x01: disconnected.
+		 *  0x02: connected.
+		 */
+		switch (data[4]) {
+		case 0x01:
+			steam_do_connect_event(steam, false);
+			break;
+		case 0x02:
+			steam_do_connect_event(steam, true);
+			break;
+		}
+		break;
+	case 0x04:
+		/* TODO battery status */
+		break;
+	}
+	return 0;
+}
+
+static const struct hid_device_id steam_controllers[] = {
+	{ /* Wired Steam Controller */
+	  HID_USB_DEVICE(USB_VENDOR_ID_VALVE,
+		USB_DEVICE_ID_STEAM_CONTROLLER)
+	},
+	{ /* Wireless Steam Controller */
+	  HID_USB_DEVICE(USB_VENDOR_ID_VALVE,
+		USB_DEVICE_ID_STEAM_CONTROLLER_WIRELESS),
+	  .driver_data = STEAM_QUIRK_WIRELESS
+	},
+	{}
+};
+
+MODULE_DEVICE_TABLE(hid, steam_controllers);
+
+static struct hid_driver steam_controller_driver = {
+	.name = "hid-steam",
+	.id_table = steam_controllers,
+	.probe = steam_probe,
+	.remove = steam_remove,
+	.raw_event = steam_raw_event,
+};
+
+module_hid_driver(steam_controller_driver);
-- 
2.16.2