Hello, world!
I am currently playing with HP LaserJet P2015D connected over USB and
I have a slight problem with the usblp driver there. Whenever I try to
read from /dev/usb/lp0 and no data are available, it immediately returns
reporting EOF (0 bytes read) instead of waiting for the data. Does
anybody know if this is intentional?
I am currently experimenting with vanilla kernel 2.6.23.9, but the problem
does not seem to be limited to this particular version.
lsusb for the printer:
| Bus 001 Device 004: ID 03f0:3817 Hewlett-Packard
| Device Descriptor:
| bLength 18
| bDescriptorType 1
| bcdUSB 2.00
| bDeviceClass 0 (Defined at Interface level)
| bDeviceSubClass 0
| bDeviceProtocol 0
| bMaxPacketSize0 64
| idVendor 0x03f0 Hewlett-Packard
| idProduct 0x3817
| bcdDevice 1.00
| iManufacturer 1 Hewlett-Packard
| iProduct 2 HP LaserJet P2015 Series
| iSerial 3 00CNBW74108M
| bNumConfigurations 1
| Configuration Descriptor:
| bLength 9
| bDescriptorType 2
| wTotalLength 55
| bNumInterfaces 2
| bConfigurationValue 1
| iConfiguration 0
| bmAttributes 0xc0
| Self Powered
| MaxPower 2mA
| Interface Descriptor:
| bLength 9
| bDescriptorType 4
| bInterfaceNumber 0
| bAlternateSetting 0
| bNumEndpoints 2
| bInterfaceClass 7 Printer
| bInterfaceSubClass 1 Printer
| bInterfaceProtocol 2 Bidirectional
| iInterface 17 Printer
| 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 0x81 EP 1 IN
| bmAttributes 2
| Transfer Type Bulk
| Synch Type None
| Usage Type Data
| wMaxPacketSize 0x0200 1x 512 bytes
| bInterval 0
| Interface Descriptor:
| bLength 9
| bDescriptorType 4
| bInterfaceNumber 1
| bAlternateSetting 0
| bNumEndpoints 2
| bInterfaceClass 255 Vendor Specific Class
| bInterfaceSubClass 1
| bInterfaceProtocol 1
| iInterface 19 HP EWS
| Endpoint Descriptor:
| bLength 7
| bDescriptorType 5
| bEndpointAddress 0x0b EP 11 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 0x8b EP 11 IN
| bmAttributes 2
| Transfer Type Bulk
| Synch Type None
| Usage Type Data
| wMaxPacketSize 0x0200 1x 512 bytes
| bInterval 0
| Device Qualifier (for other device speed):
| bLength 10
| bDescriptorType 6
| bcdUSB 2.00
| bDeviceClass 0 (Defined at Interface level)
| bDeviceSubClass 0
| bDeviceProtocol 0
| bMaxPacketSize0 64
| bNumConfigurations 1
| Device Status: 0x0001
| Self Powered
Have a nice fortnight
--
Martin `MJ' Mares <[EMAIL PROTECTED]>
http://mj.ucw.cz/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
Immanuel doesn't pun, he Kant.
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