On 17 Nov 2009, at 21:09, Oliver Neukum wrote:
Am Dienstag, 17. November 2009 20:41:18 schrieb Alan Stern:
What's the best way to allow each driver to have a crack at this
particular interface?
The best way is to have each driver probe the interface and check
whether it is the right driver. If it isn't the probe should fail
with -ENODEV; then the driver core will continue on to probe other
drivers.
Yes. The problem is how to tell that something is not a serial
interface.
It should have two bulk pipes. That is not very diagnostic. We can
hardly
guess that it is a pseudo-acm interface if it is on the same device as
a real acm interface.
Thanks Oliver and Alan for your comments. I hadn't realised that the
driver core would try alternative drivers - that's exactly the sort of
thing I needed to know, thanks. rndis_host will indeed return ENODEV
if it fails to initialise the device. Is there any way to guarantee
that rndis_host gets to look at it before cdc-acm? That would give the
desired behaviour.
An alternative could be to list the various specific vendor/product
IDs for each Nokia phone. But there are many new ones each year so I
assume we don't want to do that. Or perhaps cdc-acm could claim the
interface for any Nokia device. (Some Nokia phones also support RNDIS,
so I'd need to be careful.)
Oliver, to answer your specific points:
If it is a serial port, why not as a serial port /dev/ttyUSBx ?
Whatever you think is preferable. The existing CDC ACM driver requires
zero changes to do the right thing, so that's why I stuck with its
default device name.
Please post "lsusb -v" for this device.
Given below. Thanks again for your comments.
Adrian
Bus 001 Device 035: ID 0421:01f5 Nokia Mobile Phones
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0421 Nokia Mobile Phones
idProduct 0x01f5
bcdDevice 1.00
iManufacturer 1 Nokia
iProduct 2 Nokia N97
iSerial 3 354225030414143
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 429
bNumInterfaces 14
bConfigurationValue 1
iConfiguration 4 Bulk transfer method configuration
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 6 MTP
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 255
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 255
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 3
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 7 CDC Comms Interface
CDC Header:
bcdCDC 1.10
CDC ACM:
bmCapabilities 0x0f
connection notifications
sends break
line coding and serial state
get/set/clear comm features
CDC Union:
bMasterInterface 1
bSlaveInterface 2
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 8
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 8 CDC Data Interface
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 255
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 255
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 255 Vendor Specific (MSFT RNDIS?)
iInterface 9 CDC Comms Interface
CDC Header:
bcdCDC 1.10
CDC ACM:
bmCapabilities 0x0f
connection notifications
sends break
line coding and serial state
get/set/clear comm features
CDC Union:
bMasterInterface 3
bSlaveInterface 4
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 8
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 4
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 10 CDC Data Interface
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x86 EP 6 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
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 255
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 5
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 2 Communications
bInterfaceSubClass 8 Wireless Handset Control
bInterfaceProtocol 0
iInterface 0
CDC Header:
bcdCDC 1.10
CDC WHCM:
bcdVersion 1.00
CDC Union:
bMasterInterface 5
bSlaveInterface 6 7 8 9 10 11 12 13
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 6
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 2 Communications
bInterfaceSubClass 11 OBEX
bInterfaceProtocol 0
iInterface 11 SYNCML-SYNC
CDC Header:
bcdCDC 1.10
CDC OBEX:
bcdVersion 1.00
CDC Union:
bMasterInterface 6
bSlaveInterface 7
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 7
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 7
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x87 EP 7 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
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 255
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 8
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 2 Communications
bInterfaceSubClass 11 OBEX
bInterfaceProtocol 0
iInterface 12 PC Suite Services
CDC Header:
bcdCDC 1.10
CDC OBEX:
bcdVersion 1.00
CDC Union:
bMasterInterface 8
bSlaveInterface 9
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 9
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 9
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x88 EP 8 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x05 EP 5 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 10
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 2 Communications
bInterfaceSubClass 254
bInterfaceProtocol 0
iInterface 13 UsbPnComm
CDC Header:
bcdCDC 10.01
UNRECOGNIZED CDC: 03 24 ab
CDC Union:
bMasterInterface 10
bSlaveInterface 11
UNRECOGNIZED CDC: 04 24 fd 00
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 11
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 14 UsbPnDataAlt0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 11
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 15 UsbPnDataAlt1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x89 EP 9 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x06 EP 6 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 12
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 2 Communications
bInterfaceSubClass 253
bInterfaceProtocol 0
iInterface 16 LCIF_Alt0
CDC Header:
bcdCDC 1.10
UNRECOGNIZED CDC: 05 24 fc 00 01
CDC Union:
bMasterInterface 12
bSlaveInterface 13
UNRECOGNIZED CDC: 04 24 fd 00
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 13
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 13
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x8a EP 10 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 6
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x07 EP 7 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 13
bAlternateSetting 2
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x8a EP 10 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x07 EP 7 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 255 Vendor Specific Subclass
bDeviceProtocol 255 Vendor Specific Protocol
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
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