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Message-ID: <CAPVz0n1x9gWC0XzC0VQ=syT3LAm_5xof-_T5=8TzKapBQheVjw@mail.gmail.com>
Date: Mon, 26 Jan 2026 16:55:41 +0200
From: Svyatoslav Ryhel <clamor95@...il.com>
To: Lars Melin <larsm17@...il.com>
Cc: Oliver Neukum <oneukum@...e.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] usb: csc-acm: add Infineon/Comneon modem support (1519:0020)
пн, 26 січ. 2026 р. о 15:51 Lars Melin <larsm17@...il.com> пише:
>
> On 2026-01-22 23:17, Svyatoslav Ryhel wrote:
> > чт, 22 січ. 2026 р. о 17:58 Lars Melin <larsm17@...il.com> пише:
> >>
> >> On 2026-01-22 22:17, Svyatoslav Ryhel wrote:
> >>> Add support for Infineon/Comneon XMM626X modem that used in many Tegra30
> >>> devices with GSM capablities like LG Optimus 4X (P880) and Vu (P895).
> >>>
> >>> The Vendor Id is 0x1519
> >>> The Product ID is 0x0020
> >>>
> >>> Output of lsusb:
> >>> Bus 001 Device 002: ID 1519:0020 Comneon HSIC Device
> >>>
> >>> Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
> >>
> >> Hi,
> >> please include a full lsusb output, ie lsusb -vd 1519:0020 so we can
> >> verify that union descriptors are missing.
> >> (I have seen a full lsusb output where they are included.)
> >>
> > Hello there! Sure, here is what I get if I use lsusb -vd 1519:0020
> >
> > lg-p895:~$ lsusb
> > Bus 001 Device 001: ID 1d6b:0002 Linux 6.16.0+ ehci_hcd EHCI Host Controller
> > Bus 001 Device 002: ID 1519:0020 Comneon HSIC Device
> > lg-p895:~$ lsusb -vd 1519:0020
> > Bus 001 Device 001: ID 1d6b:0002 Linux 6.16.0+ ehci_hcd EHCI Host Controller
> > Bus 001 Device 002: ID 1519:0020 Comneon HSIC Device
> > lg-p895:~$ lsusb -vd 1519:0020
> > Bus 001 Device 001: ID 1d6b:0002 Linux 6.16.0+ ehci_hcd EHCI Host Controller
> > Bus 001 Device 002: ID 1519:0020 Comneon HSIC Device
> >
> > regular lsusb is added for reference.
>
>
> You are using a stripped down version of lsusb which doesn't give a
> verbose output, please install the full version and try again.
> If you don't have the full lsusb, how do you then know that your
> device has a faulty union descriptor?
> The full lsusb listing that I have for 1519:0020 has a correct
> union descriptor so doesn't need a quirk.
>
Bus 001 Device 002: ID 1519:0020 Comneon HSIC Device
Couldn't open device, some information will be missing
Negotiated speed: High Speed (480Mbps)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 2 [unknown]
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x1519 Comneon
idProduct 0x0020 HSIC Device
bcdDevice 12.74
iManufacturer 1 Comneon
iProduct 2 HSIC Device
iSerial 3 0123456789
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0111
bNumInterfaces 8
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 100mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 2 [unknown]
bFunctionSubClass 2 [unknown]
bFunctionProtocol 1
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 [unknown]
bInterfaceSubClass 2 [unknown]
bInterfaceProtocol 1
iInterface 4
CDC Header:
bcdCDC 1.10
CDC Union:
bMasterInterface 0
bSlaveInterface 1
CDC Call Management:
bmCapabilities 0x00
bDataInterface 1
CDC ACM:
bmCapabilities 0x07
sends break
line coding and serial state
get/set/clear comm features
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 [unknown]
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 0
iInterface 5
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 2
bInterfaceCount 2
bFunctionClass 2 [unknown]
bFunctionSubClass 2 [unknown]
bFunctionProtocol 1
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 [unknown]
bInterfaceSubClass 2 [unknown]
bInterfaceProtocol 1
iInterface 6
CDC Header:
bcdCDC 1.10
CDC Union:
bMasterInterface 2
bSlaveInterface 3
CDC Call Management:
bmCapabilities 0x00
bDataInterface 3
CDC ACM:
bmCapabilities 0x07
sends break
line coding and serial state
get/set/clear comm features
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x86 EP 6 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 [unknown]
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 0
iInterface 7
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 4
bInterfaceCount 2
bFunctionClass 2 [unknown]
bFunctionSubClass 2 [unknown]
bFunctionProtocol 1
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 4
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 [unknown]
bInterfaceSubClass 2 [unknown]
bInterfaceProtocol 1
iInterface 8
CDC Header:
bcdCDC 1.10
CDC Union:
bMasterInterface 4
bSlaveInterface 5
CDC Call Management:
bmCapabilities 0x00
bDataInterface 5
CDC ACM:
bmCapabilities 0x07
sends break
line coding and serial state
get/set/clear comm features
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x87 EP 7 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 5
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 [unknown]
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 0
iInterface 9
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 6
bInterfaceCount 2
bFunctionClass 2 [unknown]
bFunctionSubClass 2 [unknown]
bFunctionProtocol 1
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 6
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 [unknown]
bInterfaceSubClass 2 [unknown]
bInterfaceProtocol 1
iInterface 10
CDC Header:
bcdCDC 1.10
CDC Union:
bMasterInterface 6
bSlaveInterface 7
CDC Call Management:
bmCapabilities 0x00
bDataInterface 7
CDC ACM:
bmCapabilities 0x07
sends break
line coding and serial state
get/set/clear comm features
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x88 EP 8 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 7
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 [unknown]
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 0
iInterface 11
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
> thanks
> Lars
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