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update SMB_BWRITE documentation, clarify SMB_BREAD

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After removal of SMB_TRANS some information in the description of
SMB_BWRITE has become stale.  E.g., the maximum block size has been
restored to 32.

Also, the descriptions of SMB_BREAD and SMB_BWRITE had some
incorrect information on the SMBus protocol details.

MFC after:	1 week
X-MFC with:	r308242
Differential Revision: https://reviews.freebsd.org/D8431
This commit is contained in:
Andriy Gapon 2016-11-11 15:16:37 +00:00
parent 87acb7f815
commit f1cd40a19d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=308532
1 changed files with 9 additions and 10 deletions
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19
share/man/man4/smb.4
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@ -141,26 +141,25 @@ in
.Em BlockWrite
first sends the byte from
.Fa cmd
to the device, followed by
to the device, then the byte from
.Fa wcount
followed by
.Fa wcount
bytes of data that are taken from the buffer pointed to by
.Fa wbuf .
The SMBus specification mandates that no more than 32 bytes of
data can be transferred in a single block read or write command,
but since
.Xr smbus 4
is also used to access I2C devices, the limit has been increased
to 1024.
data can be transferred in a single block read or write command.
This value can be read from the constant
.Dv SMB_MAXBLOCKSIZE .
.It Dv SMB_BREAD Ta
.Em BlockRead
first sends the byte from
.Fa cmd
to the device, then reads
.Fa rcount
bytes of data that from the device.
This data is returned in the buffer pointed to by
to the device, then reads a count of data bytes that the device
is going to provide and then reads that many bytes.
The count is returned in
.Fa rcount.
The data is returned in the buffer pointed to by
.Fa rbuf .
.El
.Pp