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Message-ID: <8794178c-0522-4532-b21e-3904f90619f6@gmail.com> Date: Tue, 27 Jan 2026 08:12:15 +0700 From: Lars Melin <larsm17@...il.com> To: Svyatoslav Ryhel <clamor95@...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) On 2026-01-26 21:55, Svyatoslav Ryhel wrote: /snip > > 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 > Hi, I can't see anything wrong with the union descriptor in your listing. What is your reason for adding this device to cdc-acm? thanks Lars
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