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Message-Id: <20180213120308.23879-1-rodrigorivascosta@gmail.com>
Date:   Tue, 13 Feb 2018 13:03:06 +0100
From:   Rodrigo Rivas Costa <rodrigorivascosta@...il.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Cc:     Rodrigo Rivas Costa <rodrigorivascosta@...il.com>
Subject: [PATCH 1/3] HID: add driver for Valve Steam Controller

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@...il.com>
---
 drivers/hid/Kconfig      |   8 +
 drivers/hid/Makefile     |   1 +
 drivers/hid/hid-ids.h    |   4 +
 drivers/hid/hid-quirks.c |   4 +
 drivers/hid/hid-steam.c  | 480 +++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 497 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-quirks.c b/drivers/hid/hid-quirks.c
index 5f6035a5ce36..72ac972dc00b 100644
--- a/drivers/hid/hid-quirks.c
+++ b/drivers/hid/hid-quirks.c
@@ -629,6 +629,10 @@ static const struct hid_device_id hid_have_special_driver[] = {
 #if IS_ENABLED(CONFIG_HID_SPEEDLINK)
 	{ HID_USB_DEVICE(USB_VENDOR_ID_X_TENSIONS, USB_DEVICE_ID_SPEEDLINK_VAD_CEZANNE) },
 #endif
+#if IS_ENABLED(CONFIG_HID_STEAM)
+	{ HID_USB_DEVICE(USB_VENDOR_ID_VALVE, USB_DEVICE_ID_STEAM_CONTROLLER) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_VALVE, USB_DEVICE_ID_STEAM_CONTROLLER_WIRELESS) },
+#endif
 #if IS_ENABLED(CONFIG_HID_STEELSERIES)
 	{ HID_USB_DEVICE(USB_VENDOR_ID_STEELSERIES, USB_DEVICE_ID_STEELSERIES_SRWS1) },
 #endif
diff --git a/drivers/hid/hid-steam.c b/drivers/hid/hid-steam.c
new file mode 100644
index 000000000000..03f912ab5484
--- /dev/null
+++ b/drivers/hid/hid-steam.c
@@ -0,0 +1,480 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * HID driver for Valve Steam Controller
+ *
+ * Supports both the wired and wireless interfaces.
+ *
+ * Copyright (c) 2018 Rodrigo Rivas Costa <rodrigorivascosta@...il.com>
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/usb.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@...il.com>");
+
+#define STEAM_QUIRK_WIRELESS		BIT(0)
+
+struct steam_device {
+	spinlock_t lock;
+	struct hid_device *hid_dev;
+	struct input_dev *input_dev;
+	unsigned long quirks;
+	struct work_struct work_connect;
+	bool connected;
+};
+
+static int steam_register(struct steam_device *steam);
+static void steam_unregister(struct steam_device *steam);
+static void steam_do_connect_event(struct steam_device *steam, bool connected);
+static void steam_do_input_event(struct steam_device *steam, u8 *data);
+
+static int steam_input_open(struct input_dev *dev)
+{
+	struct steam_device *steam = input_get_drvdata(dev);
+
+	return hid_hw_open(steam->hid_dev);
+}
+
+static void steam_input_close(struct input_dev *dev)
+{
+	struct steam_device *steam = input_get_drvdata(dev);
+
+	hid_hw_close(steam->hid_dev);
+}
+
+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;
+
+	dbg_hid("%s\n", __func__);
+
+	spin_lock_irqsave(&steam->lock, flags);
+	connected = steam->connected;
+	spin_unlock_irqrestore(&steam->lock, flags);
+
+	if (connected) {
+		if (steam->input_dev) {
+			dbg_hid("%s: already connected\n", __func__);
+			return;
+		}
+		ret = steam_register(steam);
+		if (ret) {
+			hid_err(steam->hid_dev,
+				"%s:steam_register returned error %d\n",
+				__func__, ret);
+			return;
+		}
+	} else {
+		steam_unregister(steam);
+	}
+}
+
+static int steam_probe(struct hid_device *hdev,
+			 const struct hid_device_id *id)
+{
+	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
+	struct steam_device *steam;
+	int ret;
+
+	dbg_hid("%s called for ifnum %d protocol %d\n", __func__,
+		intf->cur_altsetting->desc.bInterfaceNumber,
+		intf->cur_altsetting->desc.bInterfaceProtocol
+		);
+
+	/*
+	 * 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.
+	 * Instead of the interface index we use the protocol, it is 0
+	 * for the real game pad.
+	 * Since we have a real game pad now, we can ignore the virtual
+	 * mouse and keyboard.
+	 */
+	if (intf->cur_altsetting->desc.bInterfaceProtocol != 0) {
+		dbg_hid("%s: interface ignored\n", __func__);
+		return -ENODEV;
+	}
+
+	steam = kzalloc(sizeof(struct steam_device), GFP_KERNEL);
+	if (!steam)
+		return -ENOMEM;
+
+	spin_lock_init(&steam->lock);
+	steam->hid_dev = hdev;
+	hid_set_drvdata(hdev, steam);
+	steam->quirks = id->driver_data;
+	INIT_WORK(&steam->work_connect, steam_work_connect_cb);
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		hid_err(hdev,
+			"%s:parse of hid interface failed\n", __func__);
+		goto hid_parse_fail;
+	}
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (ret) {
+		hid_err(hdev,
+			"%s:hid_hw_start returned error\n", __func__);
+		goto hid_hw_start_fail;
+	}
+
+	if (steam->quirks & STEAM_QUIRK_WIRELESS) {
+		steam->input_dev = NULL;
+		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 returned error\n",
+				__func__);
+			goto input_register_fail;
+		}
+	}
+
+	return 0;
+
+input_register_fail:
+hid_hw_open_fail:
+	hid_hw_stop(hdev);
+hid_hw_start_fail:
+hid_parse_fail:
+	cancel_work_sync(&steam->work_connect);
+	kfree(steam);
+	hid_set_drvdata(hdev, NULL);
+	return ret;
+}
+
+static void steam_remove(struct hid_device *hdev)
+{
+	struct steam_device *steam = hid_get_drvdata(hdev);
+
+	dbg_hid("%s\n", __func__);
+
+	if (steam->quirks & STEAM_QUIRK_WIRELESS) {
+		hid_info(hdev, "Steam wireless receiver disconnected");
+		hid_hw_close(hdev);
+	}
+	hid_hw_stop(hdev);
+	steam_unregister(steam);
+	cancel_work_sync(&steam->work_connect);
+	kfree(steam);
+	hid_set_drvdata(hdev, NULL);
+}
+
+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);
+
+	/*
+	 * 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:
+		steam_do_input_event(steam, data);
+		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 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
+ * 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, u8 *data)
+{
+	struct input_dev *input = steam->input_dev;
+
+	/* 24 bits of buttons */
+	u8 b8, b9, b10;
+
+	/*
+	 * If we get input events from the wireless without a 'connected'
+	 * event, just connect it now.
+	 * This can happen, for example, if we bind the HID device with
+	 * the controller already paired.
+	 */
+	if (unlikely(!input)) {
+		dbg_hid("%s: input data without connect event\n", __func__);
+		steam_do_connect_event(steam, true);
+		return;
+	}
+
+	input_report_abs(input, ABS_Z, data[11]);
+	input_report_abs(input, ABS_RZ, data[12]);
+
+	input_report_abs(input, ABS_X,
+			(s16) le16_to_cpup((__le16 *)(data + 16)));
+	input_report_abs(input, ABS_Y,
+			-(s16) le16_to_cpup((__le16 *)(data + 18)));
+	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)));
+
+	b8 = data[8];
+	b9 = data[9];
+	b10 = data[10];
+
+	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_register(struct steam_device *steam)
+{
+	struct hid_device *hdev = steam->hid_dev;
+	struct input_dev *input;
+	int ret;
+
+	dbg_hid("%s\n", __func__);
+
+	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 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, 0, 0);
+	input_set_abs_params(input, ABS_RY, -32767, 32767, 0, 0);
+	input_set_abs_params(input, ABS_HAT0X, -1, 1, 0, 0);
+	input_set_abs_params(input, ABS_HAT0Y, -1, 1, 0, 0);
+
+	ret = input_register_device(input);
+	if (ret)
+		goto input_register_fail;
+
+	steam->input_dev = input;
+
+	return 0;
+
+input_register_fail:
+	input_free_device(input);
+	return ret;
+}
+
+static void steam_unregister(struct steam_device *steam)
+{
+	dbg_hid("%s\n", __func__);
+
+	if (steam->input_dev) {
+		hid_info(steam->hid_dev, "Steam Controller disconnected");
+		input_unregister_device(steam->input_dev);
+		steam->input_dev = NULL;
+	}
+}
+
+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);
+/* vi: set softtabstop=8 shiftwidth=8 noexpandtab tabstop=8: */
-- 
2.16.1

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