diff options
Diffstat (limited to 'share/man/man4/cmx.4')
| -rw-r--r-- | share/man/man4/cmx.4 | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/share/man/man4/cmx.4 b/share/man/man4/cmx.4 index 38ae4661789d..de4a116a5694 100644 --- a/share/man/man4/cmx.4 +++ b/share/man/man4/cmx.4 @@ -42,7 +42,8 @@ driver provides support for the PCCARD based smartcard reader. The driver provides a character device special file based .Em Chip/Smart Card Interface Devices (CCID) -interface. The driver implements what the vendor calls the +interface. +The driver implements what the vendor calls the .Em Synchronous API onto the smartcard reader device. .Pp @@ -51,8 +52,9 @@ Reading and writing is synchronous, meaning that a call to directly corresponds to a complete CCID command sent to the device, while the following .Xr read 2 -will return the complete answer from the reader. There is no -support for partial reads or writes. There is no upper limit on +will return the complete answer from the reader. +There is no support for partial reads or writes. +There is no upper limit on CCID request or response sizes, but the complete CCID request must be sent to the driver in .Xr write 2 @@ -64,7 +66,8 @@ Non-blocking I/O, .Xr select 2 and .Xr poll 2 -are supported and work as expected. An open file descriptor +are supported and work as expected. +An open file descriptor will always be ready for writing, but only ready for reading if the device indicates that it has data available. .Sh FILES @@ -112,9 +115,9 @@ Early testing and bug fixes by .An -nosplit The way the .Nm -driver talks to the CardMan 4040 is a bit rough. Due to the -complete lack of hardware documentation other than vendor drivers +driver talks to the CardMan 4040 is a bit rough. +Due to the complete lack of hardware documentation other than vendor drivers for other operating systems, the gory details of the device's -I/O registers are not understood very well. There may be error -conditions which can only be solved by physically reinserting the -reader. +I/O registers are not understood very well. +There may be error conditions which can only be solved by physically +reinserting the reader. |