Re: [RESEND PATCH 1/2] HID: Add driver for RC Simulator Controllers

From: Marcus Folkesson
Date: Tue Aug 23 2022 - 13:34:58 EST

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Thank you Benjamin,

On Tue, Aug 23, 2022 at 11:49:59AM +0200, Benjamin Tissoires wrote:
> Hi Marcus,
>
> [and sorry for the delay in the review of your patches]
>
> On Mon, Aug 22, 2022 at 8:04 AM Marcus Folkesson
> <marcus.folkesson@xxxxxxxxx> wrote:
> >
> > Several RC Simulator Controllers are HID compliant with similar
> > interface.
> >
> > Add support for these controllers:
> > - Phoenix RC (HID variant)
> > - Car VRC2.0
> > - Real Flight G5/G6/G7
> > - Aero Fly, FMS
> > - OrangeRX FrSky
> >
> > Signed-off-by: Marcus Folkesson <marcus.folkesson@xxxxxxxxx>
> > ---
> > Documentation/hid/index.rst | 1 +
> > Documentation/hid/rcsim.rst | 142 ++++++++++++++++
> > drivers/hid/Kconfig | 11 ++
> > drivers/hid/Makefile | 1 +
> > drivers/hid/hid-ids.h | 5 +
> > drivers/hid/hid-rcsim.c | 315 ++++++++++++++++++++++++++++++++++++
> > 6 files changed, 475 insertions(+)
> > create mode 100644 Documentation/hid/rcsim.rst
> > create mode 100644 drivers/hid/hid-rcsim.c
> >
> > diff --git a/Documentation/hid/index.rst b/Documentation/hid/index.rst
> > index e50f513c579c..e5813d264f37 100644
> > --- a/Documentation/hid/index.rst
> > +++ b/Documentation/hid/index.rst
> > @@ -17,3 +17,4 @@ Human Interface Devices (HID)
> > hid-alps
> > intel-ish-hid
> > amd-sfh-hid
> > + rcsim
> > diff --git a/Documentation/hid/rcsim.rst b/Documentation/hid/rcsim.rst
> > new file mode 100644
> > index 000000000000..1a031f7189cb
> > --- /dev/null
> > +++ b/Documentation/hid/rcsim.rst
> > @@ -0,0 +1,142 @@
> > +.. SPDX-License-Identifier: GPL-2.0
> > +
> > +=================================
> > +rcsim - RC Simulator Controllers
> > +=================================
> > +
> > +:Author: Marcus Folkesson <marcus.folkesson@xxxxxxxxx>
> > +
> > +This driver let you use your own RC controller plugged
> > +into your computer using an HID compatible USB dongle.
> > +
> > +There are several HID compatible USB dongles from different
> > +vendors. The driver currently supports:
> > +
> > +- Phoenix RC (HID variant) (8ch)
> > +- Car VRC2.0 (2ch)
> > +- Real Flight G5/G6/G7 (6ch)
> > +- Aero Fly, FMS (8ch)
> > +- OrangeRX FrSky (6ch)
> > +
> > +Many RC controllers is able to configure which stick goes to which channel.
> > +This is also configurable in most simulators, so a matching is not necessary.
> > +
> > +Supported dongles
> > +==================
> > +
> > +PhoenixRC
> > +----------
> > +
> > +The PhoenixRC has one HID compatible variant which is supported by this driver.
> > +The controller has support for 8 analog channels.
> > +
> > +The driver is generating the following input event for on channels:
> > +
> > ++---------+----------------+
> > +| Channel | Event |
> > ++=========+================+
> > +| 1 | ABS_Y |
> > ++---------+----------------+
> > +| 2 | ABS_X |
> > ++---------+----------------+
> > +| 3 | ABS_RY |
> > ++---------+----------------+
> > +| 4 | ABS_RX |
> > ++---------+----------------+
> > +| 5 | ABS_RUDDER |
> > ++---------+----------------+
> > +| 6 | ABS_THROTTLE |
> > ++---------+----------------+
> > +| 7 | ABS_Z |
> > ++---------+----------------+
> > +| 8 | ABS_RZ |
> > ++---------+----------------+
> > +
> > +VRC2.0
> > +----------
> > +VRC2.0 is a controller for RC Cars.
> > +The controller has support for 2 analog channels.
> > +
> > +The driver is generating the following input event for on channels:
> > +
> > ++---------+----------------+
> > +| Channel | Event |
> > ++=========+================+
> > +| 1 | ABS_GAS |
> > ++---------+----------------+
> > +| 2 | ABS_WHEEL |
> > ++---------+----------------+
> > +
> > +RealFlight
> > +----------
> > +
> > +This driver supports Realflight G4-G7 and above
> > +The controller has support for 4 analog channels and two buttons.
> > +
> > +The driver is generating the following input event for on channels:
> > +
> > ++---------+----------------+
> > +| Channel | Event |
> > ++=========+================+
> > +| 1 | ABS_Y |
> > ++---------+----------------+
> > +| 2 | ABS_X |
> > ++---------+----------------+
> > +| 3 | ABS_RY |
> > ++---------+----------------+
> > +| 4 | ABS_RX |
> > ++---------+----------------+
> > +| 5 | BTN_A |
> > ++---------+----------------+
> > +| 6 | BTN_B |
> > ++---------+----------------+
> > +
> > +XTR+G2+FMS Controllers
> > +--------------------------------
> > +
> > +The controllers has support for 8 analog channels.
> > +
> > +The driver is generating the following input event for on channels:
> > +
> > ++---------+----------------+
> > +| Channel | Event |
> > ++=========+================+
> > +| 1 | ABS_Y |
> > ++---------+----------------+
> > +| 2 | ABS_X |
> > ++---------+----------------+
> > +| 3 | ABS_RY |
> > ++---------+----------------+
> > +| 4 | ABS_RX |
> > ++---------+----------------+
> > +| 5 | ABS_RUDDER |
> > ++---------+----------------+
> > +| 6 | ABS_THROTTLE |
> > ++---------+----------------+
> > +| 7 | ABS_Z |
> > ++---------+----------------+
> > +| 8 | ABS_RZ |
> > ++---------+----------------+
> > +
> > +OrangeRX
> > +----------
> > +
> > +The controllers has support for 6 analog channels.
> > +
> > +The driver is generating the following input event for on channels:
> > +
> > ++---------+----------------+
> > +| Channel | Event |
> > ++=========+================+
> > +| 1 | ABS_Y |
> > ++---------+----------------+
> > +| 2 | ABS_X |
> > ++---------+----------------+
> > +| 3 | ABS_RY |
> > ++---------+----------------+
> > +| 4 | ABS_RX |
> > ++---------+----------------+
> > +| 5 | ABS_RUDDER |
> > ++---------+----------------+
> > +| 6 | ABS_THROTTLE |
> > ++---------+----------------+
> > diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
> > index 70da5931082f..d8313d36086c 100644
> > --- a/drivers/hid/Kconfig
> > +++ b/drivers/hid/Kconfig
> > @@ -957,6 +957,17 @@ config HID_RAZER
> > Support for Razer devices that are not fully compliant with the
> > HID standard.
> >
> > +config HID_RCSIM
> > + tristate "RC Simulator Controllers"
> > + depends on HID
> > + help
> > + Support for several HID compatible RC Simulator Controllers including
> > + - Phoenix RC
> > + - Car VRC2.0
> > + - Real Flight
> > + - Aero Fly, FMS
> > + - OrangeRX FrSky
> > +
> > config HID_PRIMAX
> > tristate "Primax non-fully HID-compliant devices"
> > depends on HID
> > diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
> > index cac2cbe26d11..85d50ab352ee 100644
> > --- a/drivers/hid/Makefile
> > +++ b/drivers/hid/Makefile
> > @@ -102,6 +102,7 @@ obj-$(CONFIG_HID_PLANTRONICS) += hid-plantronics.o
> > obj-$(CONFIG_HID_PLAYSTATION) += hid-playstation.o
> > obj-$(CONFIG_HID_PRIMAX) += hid-primax.o
> > obj-$(CONFIG_HID_RAZER) += hid-razer.o
> > +obj-$(CONFIG_HID_RCSIM) += hid-rcsim.o
>
> General rule of thumbs, we try to name the drivers after their
> vendors, unless we know we have a generic driver.
>
> Here, this driver seems to be really tied to a small set of devices,
> and thus I don't think we can call it "generic".

Got it.

>
> > obj-$(CONFIG_HID_REDRAGON) += hid-redragon.o
> > obj-$(CONFIG_HID_RETRODE) += hid-retrode.o
> > obj-$(CONFIG_HID_ROCCAT) += hid-roccat.o hid-roccat-common.o \
> > diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> > index d9eb676abe96..baf5f74d5bed 100644
> > --- a/drivers/hid/hid-ids.h
> > +++ b/drivers/hid/hid-ids.h
> > @@ -1381,6 +1381,11 @@
> >
> > #define USB_VENDOR_ID_MULTIPLE_1781 0x1781
> > #define USB_DEVICE_ID_RAPHNET_4NES4SNES_OLD 0x0a9d
> > +#define USB_DEVICE_ID_PHOENIXRC 0x0898
> > +#define USB_DEVICE_ID_REALFLIGHT 0x0e56
> > +
> > +#define USB_VENDOR_ID_DIPLING 0x0B9B
> > +#define USB_DEVICE_ID_DIPLING_RCCONTROLLER 0x4012
> >
> > #define USB_VENDOR_ID_DRACAL_RAPHNET 0x289b
> > #define USB_DEVICE_ID_RAPHNET_2NES2SNES 0x0002
> > diff --git a/drivers/hid/hid-rcsim.c b/drivers/hid/hid-rcsim.c
> > new file mode 100644
> > index 000000000000..0f214cb5816a
> > --- /dev/null
> > +++ b/drivers/hid/hid-rcsim.c
> > @@ -0,0 +1,315 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Driver for several HID compatible RC Simulator Controllers.
> > + * Currently supported controllers are:
> > + *
> > + * - Phoenix RC (HID variant) (8ch)
> > + * - Car VRC2.0 (2ch)
> > + * - Real Flight G5/G6/G7 (6ch)
> > + * - Aero Fly, FMS (8ch)
> > + * - OrangeRX FrSky (6ch)
> > + *
> > + * Copyright (C) 2022 Marcus Folkesson <marcus.folkesson@xxxxxxxxx>
> > + */
> > +
> > +#include <linux/bitfield.h>
> > +#include <linux/device.h>
> > +#include <linux/input.h>
> > +#include <linux/hid.h>
> > +#include <linux/module.h>
> > +#include <linux/usb.h>
> > +
> > +#include "hid-ids.h"
> > +
> > +/*
> > + * Some of these VID/PID are probably "borrowed", so keep them locally and
> > + * do not populate hid-ids.h with those.
> > + */
> > +
> > +/* PHOENIXRC Controlloer (HID variant) */
> > +#define PHOENIXRC_VID (USB_VENDOR_ID_MULTIPLE_1781)
> > +#define PHOENIXRC_PID (USB_DEVICE_ID_PHOENIXRC)
> > +#define PHOENIXRC_DSIZE (8)
> > +
> > +/* VRC2 Controlloer */
> > +#define VRC2_VID (0x07c0)
> > +#define VRC2_PID (0x1125)
> > +#define VRC2_DSIZE (7)
> > +
> > +/* Realflight G4-&7 and Above Controller */
> > +#define REALFLIGHT_VID (USB_VENDOR_ID_MULTIPLE_1781)
> > +#define REALFLIGHT_PID (USB_DEVICE_ID_REALFLIGHT)
> > +#define REALFLIGHT_DSIZE (8)
> > +
> > +#define REALFLIGHT_BTN_A BIT(0)
> > +#define REALFLIGHT_BTN_B BIT(1)
> > +
> > +/* XTR+G2+FMS Controller */
> > +#define XTRG2FMS_VID (USB_VENDOR_ID_DIPLING)
> > +#define XTRG2FMS_PID (USB_DEVICE_ID_DIPLING_RCCONTROLLER)
> > +#define XTRG2FMS_DSIZE (8)
> > +
> > +#define XTRG2FMS_X_HI GENMASK(3, 2)
> > +#define XTRG2FMS_Y_HI GENMASK(1, 0)
> > +#define XTRG2FMS_RX_HI GENMASK(7, 6)
> > +#define XTRG2FMS_RY_HI GENMASK(5, 4)
> > +#define XTRG2FMS_ALT1_HI GENMASK(3, 2)
> > +#define XTRG2FMS_ALT2_HI GENMASK(1, 0)
> > +
> > +/* OrangeRX FrSky */
> > +#define ORANGERX_VID (0x0451)
> > +#define ORANGERX_PID (0x16a5)
> > +#define ORANGERX_DSIZE (8)
> > +
> > +enum rcsim_controller {
> > + PHOENIXRC,
> > + VRC2,
> > + REALFLIGHT,
> > + XTRG2FMS,
> > + ORANGERX
> > +};
> > +
> > +struct rcsim_priv {
> > + struct hid_device *hdev;
> > + struct input_dev *input;
> > + enum rcsim_controller controller;
> > + u8 alt;
> > +};
> > +
> > +static int rcsim_open(struct input_dev *dev)
> > +{
> > + struct rcsim_priv *priv = input_get_drvdata(dev);
> > +
> > + return hid_hw_open(priv->hdev);
> > +}
> > +
> > +static void rcsim_close(struct input_dev *dev)
> > +{
> > + struct rcsim_priv *priv = input_get_drvdata(dev);
> > +
> > + hid_hw_close(priv->hdev);
> > +}
> > +
> > +static int rcsim_setup_input(struct rcsim_priv *priv)
> > +{
> > + struct input_dev *input;
> > +
> > + input = devm_input_allocate_device(&priv->hdev->dev);
> > + if (!input)
> > + return -ENOMEM;
> > +
> > + input->id.bustype = priv->hdev->bus;
> > + input->id.vendor = priv->hdev->vendor;
> > + input->id.product = priv->hdev->product;
> > + input->id.version = priv->hdev->bus;
> > + input->phys = priv->hdev->phys;
> > + input->uniq = priv->hdev->uniq;
> > + input->open = rcsim_open;
> > + input->close = rcsim_close;
> > +
> > + input_set_drvdata(input, priv);
> > +
> > + switch (priv->controller) {
> > + case PHOENIXRC:
> > + input_set_abs_params(input, ABS_X, 0, 255, 0, 0);
> > + input_set_abs_params(input, ABS_Y, 0, 255, 0, 0);
> > + input_set_abs_params(input, ABS_RX, 0, 255, 0, 0);
> > + input_set_abs_params(input, ABS_RY, 0, 255, 0, 0);
> > + 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_RUDDER, 0, 255, 0, 0);
> > + input_set_abs_params(input, ABS_THROTTLE, 0, 255, 0, 0);
> > + input->name = "RC Simuator Controller PhoenixRC";
> > + break;
> > + case VRC2:
> > + input_set_abs_params(input, ABS_GAS, 0, 2048, 0, 0);
> > + input_set_abs_params(input, ABS_WHEEL, 0, 2048, 0, 0);
> > + input->name = "RC Simuator Controller VRC2.0";
> > + break;
> > + case REALFLIGHT:
> > + input_set_abs_params(input, ABS_X, 0, 1024, 0, 0);
> > + input_set_abs_params(input, ABS_Y, 0, 1024, 0, 0);
> > + input_set_abs_params(input, ABS_RX, 0, 1024, 0, 0);
> > + input_set_abs_params(input, ABS_RY, 0, 1024, 0, 0);
> > + input_set_capability(input, EV_KEY, BTN_A);
> > + input_set_capability(input, EV_KEY, BTN_B);
> > + input->name = "RC Simuator Controller Realflight";
> > + break;
> > + case XTRG2FMS:
> > + input_set_abs_params(input, ABS_X, 0, 1024, 0, 0);
> > + input_set_abs_params(input, ABS_Y, 0, 1024, 0, 0);
> > + input_set_abs_params(input, ABS_RX, 0, 1024, 0, 0);
> > + input_set_abs_params(input, ABS_RY, 0, 1024, 0, 0);
> > + input_set_abs_params(input, ABS_Z, 0, 1024, 0, 0);
> > + input_set_abs_params(input, ABS_RZ, 0, 1024, 0, 0);
> > + input_set_abs_params(input, ABS_RUDDER, 0, 1024, 0, 0);
> > + input_set_abs_params(input, ABS_THROTTLE, 0, 1024, 0, 0);
> > + input->name = "RC Simuator Controller AeroFly, FMS";
> > + priv->alt = 0;
> > + break;
> > + case ORANGERX:
> > + input_set_abs_params(input, ABS_X, 0, 255, 0, 0);
> > + input_set_abs_params(input, ABS_Y, 0, 255, 0, 0);
> > + input_set_abs_params(input, ABS_RX, 0, 255, 0, 0);
> > + input_set_abs_params(input, ABS_RY, 0, 255, 0, 0);
> > + input_set_abs_params(input, ABS_RUDDER, 0, 255, 0, 0);
> > + input_set_abs_params(input, ABS_THROTTLE, 0, 255, 0, 0);
> > + input->name = "RC Simuator Controller OrangeRX FrSky";
> > + break;
> > + };
> > +
> > + priv->input = input;
> > + return input_register_device(priv->input);
> > +}
>
> You are basically rewriting hid-input.c, which is suboptimal.

Ouch. I will have a look at hid-input, thanks.

>
> I guess the report descriptor provided by these devices are basically
> useless, and so you have to parse the reports yourself in the
> raw_event callback.

Yep.

>
> But instead of manually doing that, why not overwrite the report
> descriptor (with .rdesc_fixup) and declare here all of the data that
Do you mean .report_fixup?

> needs to be exported. You could remove basically everything in this
> driver by just providing a fixed report descriptor.

What you are aiming for is to fixup the report descriptor and let the
generic hid-raw driver handle the rest, or do I get you wrong?

How is the report mapped to certain events then?

I do read at [1] but it is not obvious how to put it together.
Most drivers I've looked at that is using .report_fixup just fix broken
reports. I guess these reports are not "broken", just.. odd?

>
> > +
> > +static int rcsim_raw_event(struct hid_device *hdev,
> > + struct hid_report *report,
> > + u8 *raw_data, int size)
> > +{
> > + struct rcsim_priv *priv = hid_get_drvdata(hdev);
> > + u16 value;
> > +
> > + switch (priv->controller) {
> > + case PHOENIXRC:
> > + if (size != PHOENIXRC_DSIZE)
> > + break;
> > +
> > + /* X, RX, Y and RY, RUDDER and THROTTLE are sent every time */
> > + input_report_abs(priv->input, ABS_X, raw_data[2]);
> > + input_report_abs(priv->input, ABS_Y, raw_data[0]);
> > + input_report_abs(priv->input, ABS_RX, raw_data[4]);
> > + input_report_abs(priv->input, ABS_RY, raw_data[3]);
> > + input_report_abs(priv->input, ABS_RUDDER, raw_data[5]);
> > + input_report_abs(priv->input, ABS_THROTTLE, raw_data[6]);
> > +
> > + /* Z and RZ are sent every other time */
> > + if (priv->alt)
> > + input_report_abs(priv->input, ABS_Z, raw_data[7]);
> > + else
> > + input_report_abs(priv->input, ABS_RZ, raw_data[7]);
> > +
> > + priv->alt ^= 1;
> > + break;
> > + case VRC2:
> > + if (size != VRC2_DSIZE)
> > + break;
> > + value = (raw_data[1] << 8 | raw_data[0]) & GENMASK(10, 0);
> > + input_report_abs(priv->input, ABS_GAS, value);
> > + value = (raw_data[3] << 8 | raw_data[2]) & GENMASK(10, 0);
> > + input_report_abs(priv->input, ABS_WHEEL, value);
> > + break;
> > + case REALFLIGHT:
> > + if (size != REALFLIGHT_DSIZE)
> > + break;
> > + input_report_abs(priv->input, ABS_X, raw_data[2]);
> > + input_report_abs(priv->input, ABS_Y, raw_data[1]);
> > + input_report_abs(priv->input, ABS_RX, raw_data[5]);
> > + input_report_abs(priv->input, ABS_RY, raw_data[3]);
> > + input_report_abs(priv->input, ABS_MISC, raw_data[4]);
> > + input_report_key(priv->input, BTN_A,
> > + raw_data[7] & REALFLIGHT_BTN_A);
> > + input_report_key(priv->input, BTN_B,
> > + raw_data[7] & REALFLIGHT_BTN_B);
> > + break;
> > + case XTRG2FMS:
> > + if (size != XTRG2FMS_DSIZE)
> > + break;
> > +
> > + /* X, RX, Y and RY are sent every time */
> > + value = FIELD_GET(XTRG2FMS_X_HI, raw_data[3]);
> > + value = (value << 8) | raw_data[1];
> > + input_report_abs(priv->input, ABS_X, value);
> > +
> > + value = FIELD_GET(XTRG2FMS_Y_HI, raw_data[3]);
> > + value = (value << 8) | raw_data[2];
> > + input_report_abs(priv->input, ABS_Y, value);
> > +
> > + value = FIELD_GET(XTRG2FMS_RX_HI, raw_data[3]);
> > + value = (value << 8) | raw_data[0];
> > + input_report_abs(priv->input, ABS_RX, value);
> > +
> > + value = FIELD_GET(XTRG2FMS_RY_HI, raw_data[3]);
> > + value = (value << 8) | raw_data[4];
> > + input_report_abs(priv->input, ABS_RY, value);
> > +
> > + /* Z, RZ, RUDDER and THROTTLE are sent every other time */
> > + value = FIELD_GET(XTRG2FMS_ALT1_HI, raw_data[7]);
> > + value = (value << 8) | raw_data[6];
> > + if (priv->alt)
> > + input_report_abs(priv->input, ABS_Z, value);
> > + else
> > + input_report_abs(priv->input, ABS_RUDDER, value);
> > +
> > + value = FIELD_GET(XTRG2FMS_ALT2_HI, raw_data[7]);
> > + value = (value << 8) | raw_data[5];
> > + if (priv->alt)
> > + input_report_abs(priv->input, ABS_RZ, value);
> > + else
> > + input_report_abs(priv->input, ABS_THROTTLE, value);
> > +
> > + priv->alt ^= 1;
> > + break;
> > + case ORANGERX:
> > + if (size != ORANGERX_DSIZE)
> > + break;
> > + input_report_abs(priv->input, ABS_X, raw_data[0]);
> > + input_report_abs(priv->input, ABS_Y, raw_data[2]);
> > + input_report_abs(priv->input, ABS_RX, raw_data[3]);
> > + input_report_abs(priv->input, ABS_RY, raw_data[1]);
> > + input_report_abs(priv->input, ABS_RUDDER, raw_data[5]);
> > + input_report_abs(priv->input, ABS_THROTTLE, raw_data[6]);
> > + break;
> > + };
> > +
> > + input_sync(priv->input);
> > + return 0;
> > +}
> > +
> > +static int rcsim_probe(struct hid_device *hdev, const struct hid_device_id *id)
> > +{
> > + struct device *dev = &hdev->dev;
> > + struct rcsim_priv *priv;
> > + int ret;
> > +
> > + if (!hid_is_using_ll_driver(hdev, &usb_hid_driver))
> > + return -ENODEV;
>
> You are not accessing anything in the USB stack, so there is no need
> to prevent regression tests that could inject uhid devices to your
> drivers.

Ok, thanks.

>
> Cheers,
> Benjamin
>

Best regards,
Marcus Folkesson

[1] https://www.usb.org/hid

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