Index: head/share/man/man4/smb.4 =================================================================== --- head/share/man/man4/smb.4 +++ head/share/man/man4/smb.4 @@ -37,10 +37,10 @@ .Sh DESCRIPTION The .Em smb -character device driver provides generic i/o to any +character device driver provides generic I/O to any .Xr smbus 4 instance. -In order to control SMB devices, use +To control SMB devices, use .Pa /dev/smb? with the ioctls described below. Any of these ioctl commands takes a pointer to @@ -74,86 +74,74 @@ The .Fa slave field is always used, and provides the address of the -SMBus slave device to talk to. +SMBus slave device. The slave address is specified in the seven most significant bits -.Pq i.e. Dq "left-justified" . +.Pq i.e., Dq "left-justified" . The least significant bit of the slave address must be zero. .Pp .Bl -column ".Dv SMB_QUICK_WRITE" -compact .It Em Ioctl Ta Em Description .Pp .It Dv SMB_QUICK_WRITE Ta -The .Em QuickWrite -command just issues the device address with write intent -to the bus, without transferring any data. +does not transfer any data. +It just issues the device address with write intent to the bus. .It Dv SMB_QUICK_READ Ta -The .Em QuickRead -command just issues the device address with read intent -to the bus, without transferring any data. +does not transfer any data. +It just issues the device address with read intent to the bus. .It Dv SMB_SENDB Ta -The .Em SendByte -command sends the byte provided in the +sends the byte provided in .Fa cmd -field to the device. +to the device. .It Dv SMB_RECVB Ta -The .Em ReceiveByte -command reads a single byte from the device which will -be returned in the -.Fa cmd -field. +reads a single byte from the device which is returned in +.Fa cmd . .It Dv SMB_WRITEB Ta -The .Em WriteByte -command first sends the byte from the +first sends the byte from .Fa cmd -field to the device, followed by the byte given in +to the device, followed by the byte given in .Fa wdata.byte . .It Dv SMB_WRITEW Ta -The .Em WriteWord -command first sends the byte from the +first sends the byte from .Fa cmd -field to the device, followed by the word given in +to the device, followed by the word given in .Fa wdata.word . Note that the SMBus byte-order is little-endian by definition. .It Dv SMB_READB Ta -The .Em ReadByte -command first sends the byte from the +first sends the byte from .Fa cmd -field to the device, and then reads one byte of data from +to the device, then reads one byte of data from the device. -The returned data will be stored in +Returned data is stored in .Fa rdata.byte . .It Dv SMB_READW Ta -The .Em ReadWord -command first sends the byte from the +first sends the byte from .Fa cmd -field to the device, and then reads one word of data from +to the device, then reads one word of data from the device. -The returned data will be stored in +Returned data is stored in .Fa rdata.word . .It Dv SMB_PCALL Ta -The .Em ProcedureCall -command first sends the byte from the +first sends the byte from .Fa cmd -field to the device, followed by the word provided in +to the device, followed by the word provided in .Fa wdata.word . -It then reads one word of data from the device, and returns it +It then reads one word of data from the device and returns it in .Fa rdata.word . .It Dv SMB_BWRITE Ta -The .Em BlockWrite -command first sends the byte from the +first sends the byte from .Fa cmd -field to the device, followed by +to the device, followed by .Fa wcount bytes of data that are taken from the buffer pointed to by .Fa wbuf . @@ -163,34 +151,32 @@ .Xr smbus 4 is also used to access I2C devices, the limit has been increased to 1024. -This value is available in the constant +This value can be read from the constant .Dv SMB_MAXBLOCKSIZE . .It Dv SMB_BREAD Ta -The .Em BlockRead -command first sends the byte from the +first sends the byte from .Fa cmd -field to the device, and then reads +to the device, then reads .Fa rcount bytes of data that from the device. -These data will be returned in the buffer pointed to by +This data is returned in the buffer pointed to by .Fa rbuf . .It Dv SMB_TRANS Ta -The .Em Trans -command sends an SMB roll-up transaction with flags that also allow it to -be used for (mostly) I2C pass-through and with with 10-bit addresses. -This function can be used to roll up all of the above functions. -It first sends the byte from the +sends an SMB roll-up transaction with flags that also allow it to +be used for (mostly) I2C pass-through and with 10-bit addresses. +This function can be utilized to roll up all of the above functions. +It first sends the byte from .Fa cmd -field to the device, followed by +to the device, followed by .Fa wcount bytes of data that are taken from the buffer pointed to by .Fa wbuf , then reads .Fa rcount bytes of data that from the device. -These data will be returned in the buffer pointed to by +This data is returned in the buffer pointed to by .Fa rbuf . .Pp The following flags are allowed in @@ -239,5 +225,4 @@ manual page was written by .An Nicolas Souchu and extended by -.An Michael Gmelin Aq freebsd@grem.de -. +.An Michael Gmelin Aq freebsd@grem.de .