Re: [PATCH v2 1/3] HID: add driver for Valve Steam Controller

From: Benjamin Tissoires
Date: Wed Feb 21 2018 - 09:14:02 EST

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In reply to: Rodrigo Rivas Costa: "Re: [PATCH v2 1/3] HID: add driver for Valve Steam Controller"
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On Tue, Feb 20, 2018 at 8:33 PM, Rodrigo Rivas Costa
<rodrigorivascosta@xxxxxxxxx> wrote:
> 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@xxxxxxxxx>
> ---
> 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 | 478 +++++++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 495 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

In addition to the discussion in 0/3, I wonder if you should not
remove this hunk. Unless having hid-generic binding the device before
your hid-steam driver, it would be better not force the Steam boxes to
use your driver.

I'll sneak in the discussion in 0/3.

Cheers,
Benjamin

> #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..7b2f16b7bb49
> --- /dev/null
> +++ b/drivers/hid/hid-steam.c
> @@ -0,0 +1,478 @@
> +// 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@xxxxxxxxx>
> + */
> +
> +#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@xxxxxxxxx>");
> +
> +#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
> +
> +struct steam_device {
> + spinlock_t lock;
> + struct hid_device *hdev;
> + struct input_dev *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;
> +
> + 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, 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);
> + input_abs_set_res(input, ABS_X, STEAM_PAD_RESOLUTION);
> + input_abs_set_res(input, ABS_Y, STEAM_PAD_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_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;
> +
> + steam->input = input;
> +
> + return 0;
> +
> +input_register_fail:
> + input_free_device(input);
> + return ret;
> +}
> +
> +static void steam_unregister(struct steam_device *steam)
> +{
> + if (steam->input) {
> + hid_info(steam->hdev, "Steam Controller disconnected");
> + input_unregister_device(steam->input);
> + steam->input = NULL;
> + }
> +}
> +
> +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) {
> + if (steam->input) {
> + dbg_hid("%s: already connected\n", __func__);
> + return;
> + }
> + 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;
> + }
> +
> + /*
> + * Since we have a proper gamepad now, we can ignore the virtual
> + * mouse and keyboard.
> + */
> + if (!steam_is_valve_interface(hdev))
> + return -ENODEV;
> +
> + steam = devm_kzalloc(&hdev->dev,
> + sizeof(struct steam_device), GFP_KERNEL);
> + if (!steam)
> + return -ENOMEM;
> +
> + 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);
> +
> + ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
> + if (ret) {
> + hid_err(hdev,
> + "%s:hid_hw_start failed with error %d\n",
> + __func__, ret);
> + goto hid_hw_start_fail;
> + }
> +
> + 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:
> + hid_hw_stop(hdev);
> +hid_hw_start_fail:
> + cancel_work_sync(&steam->work_connect);
> + hid_set_drvdata(hdev, NULL);
> + return ret;
> +}
> +
> +static void steam_remove(struct hid_device *hdev)
> +{
> + struct steam_device *steam = hid_get_drvdata(hdev);
> +
> + if (steam->quirks & STEAM_QUIRK_WIRELESS) {
> + hid_info(hdev, "Steam wireless receiver disconnected");
> + hid_hw_close(hdev);
> + }
> + hid_hw_stop(hdev);
> + 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
> + * 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;
> +
> + /* 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 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_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 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);
> --
> 2.16.1
>

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