力反馈Joystick支持(MS Sidewinder FF2)

Question

我想知道我的力量反馈操纵杆在Ubuntu中到底支持了多少。目前我已经安装了Ubuntu20.04.05LTS。

到目前为止我还能跑

$ lsusb 
...
Bus 001 Device 006: ID 045e:001b Microsoft Corp. SideWinder Force Feedback 2 Joystick
...
$

和

$ jstest /dev/input/js0
Driver version is 2.1.0.
Joystick (Microsoft SideWinder Force Feedback 2 Joystick) has 6 axes (X, Y, Rz, Throttle, Hat0X, Hat0Y)
and 9 buttons (Trigger, ThumbBtn, ThumbBtn2, TopBtn, TopBtn2, PinkieBtn, BaseBtn, BaseBtn2, BtnDead).
Testing ... (interrupt to exit)
Axes:  0:  1852  1:     0  2:     0  3:     0  4:     0  5:     0 Buttons:  0:off  1:off  2:off  3:off  4:off  5:off  6:off  7:off  8:on

它们看起来都工作得很好，所以基本的操纵杆功能很好。接下来，我想检查强制反馈功能。我读了https://docs.kernel.org/input/ff.html，于是试着

$ fftest /dev/input/js0
Force feedback test program.
HOLD FIRMLY YOUR WHEEL OR JOYSTICK TO PREVENT DAMAGES

Device /dev/input/js0 opened
Features:
Ioctl absolute axes features query: Invalid argument

但是，文档讨论了一些eventXX设备文件。不幸的是，它没有提到使用哪一个。因此，我将我的用户添加到input组中，并尝试

$ fftest /dev/input/event0
Force feedback test program.
HOLD FIRMLY YOUR WHEEL OR JOYSTICK TO PREVENT DAMAGES

Device /dev/input/event0 opened
Features:
  * Absolute axes: 
    [00 00 00 00 00 00 00 00 ]
  * Relative axes: 
    [00 00 ]
  * Force feedback effects types: 
    Force feedback periodic effects: 
    [00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ]
  * Number of simultaneous effects: 0

Uploading effect #0 (Periodic sinusoidal) ... Error:: Function not implemented
Uploading effect #1 (Constant) ... Error: Function not implemented
Uploading effect #2 (Spring) ... Error: Function not implemented
Uploading effect #3 (Damper) ... Error: Function not implemented
Uploading effect #4 (Strong rumble, with heavy motor) ... Error: Function not implemented
Uploading effect #5 (Weak rumble, with light motor) ... Error: Function not implemented
Enter effect number, -1 to exit

不管我输入的是什么号码，我的操纵杆的行为都是一样的:它使用武力来将操纵杆居中。可能仅仅是因为这些函数没有实现。但是，无论我指定哪个文件，都会发生相同的情况：

/dev/input/event0
/dev/input/event1
/dev/input/event...

是因为我的操纵杆不支持吗？根据https://docs.kernel.org/input/joydev/joystick.html#microsoft-sidewinder-joysticks的说法，过载协议似乎就在那里。

还可能缺少什么？

Answer 1

我偶然从部队反馈/操纵杆套件中发现了另一个命令: evtest。

将它作为root运行显示了23台设备的巨大列表，但同时也提到了它们的名称：

# evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
...
/dev/input/event23: Microsoft SideWinder Force Feedback 2 Joystick
Select the device event number [0-23]: 

有了这个提示，我又跑了一圈，得到了这样的输出：

# fftest /dev/input/event23
Force feedback test program.
HOLD FIRMLY YOUR WHEEL OR JOYSTICK TO PREVENT DAMAGES

Device /dev/input/event23 opened
Features:
  * Absolute axes: X, Y, RZ, Throttle, Hat 0 X, Hat 0 Y, 
    [63 00 03 00 00 00 00 00 ]
  * Relative axes: 
    [00 00 ]
  * Force feedback effects types: Constant, Periodic, Ramp, Spring, Friction, Damper, Rumble, Inertia, Gain, Autocenter, 
    Force feedback periodic effects: Square, Triangle, Sine, Saw up, Saw down, 
    [00 00 00 00 00 00 00 00 00 00 FF 1F 03 00 00 00 ]
  * Number of simultaneous effects: 40

Setting master gain to 75% ... OK
Uploading effect #0 (Periodic sinusoidal) ... OK (id 0)
Uploading effect #1 (Constant) ... OK (id 1)
Uploading effect #2 (Spring) ... OK (id 2)
Uploading effect #3 (Damper) ... OK (id 3)
Uploading effect #4 (Strong rumble, with heavy motor) ... OK (id 4)
Uploading effect #5 (Weak rumble, with light motor) ... OK (id 5)
Enter effect number, -1 to exit

因此，原力反馈2操纵杆似乎是由内核检测到的，它支持五种不同的效果。输入一些效果数字，如4，确实使棒摇了几秒钟。

还有另一个很好的命令可玩：

ffcfstress -d /dev/input/event23

查看https://github.com/flosse/linuxconsole：

Joystick utilities
------------------

The following utilities are provided to calibrate and test joysticks:
* ffcfstress, ffmvforce, fftest - test force-feedback devices
* ffset - set force-feedback device parameters
* jscal - calibrate joystick devices, reconfigure the axes and buttons
* jscal-store, jscal-restore - store and retrieve joystick device
  settings as configured using jscal
* jstest - test joystick devices

Answer 2

我可能遇到了真正的问题。内核文档https://docs.kernel.org/input/joydev/joystick.html#microsoft-sidewinder-joysticks列出了这些受支持的设备：

• 微软SideWinder 3D Pro
• 微软SideWinder力反馈Pro
• 微软SideWinder力反馈轮
• 微软SideWinder FreeStyle Pro
• 微软SideWinder GamePad (最多4个，连锁)
• 微软SideWinder精密Pro
• 微软SideWinder精密专业USB

注意到什么了吗？没有列出原力反馈2操纵杆。所以我从https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.1.6.tar.xz下载了内核源代码，并检查了文件linux-6.1.6/drivers/input/joystick/sidewinder.c。它包含

static char *sw_name[] = {  "3D Pro", "GamePad", "Precision Pro", "Force Feedback Pro", "FreeStyle Pro",
                "Force Feedback Wheel" };

这符合上述列表，但再次省略原力反馈2操纵杆。似乎是个被遗忘的艺术品。