lkml.org 
[lkml]   [2012]   [Jun]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 36/36] staging: comedi: cb_pcidas: cleanup dac08_write()
On 2012-06-27 02:12, H Hartley Sweeten wrote:
> Reverse the logic of the test against the cached value so that
> the function only has one exit point.
>
> Make the logic of the dac write a bit clearer by create a local
> variable for the address used in the outw() calls and masking the
> value to write and setting the enable bits before doing the outw()
> calls. Add a comment just to make sure it's clear.
>
> Also, add a comment about the 'return 1;'. This should be
> insn->n which is the number of data parameters used to do the
> dac08_write_insn() but the insn is not a parameter to this
> function.

It's probably better to make dac08_write() return void and return 1 in
dac08_write_insn().

Actually, I think dac08_write_insn() ought to call dac08_write() in a
loop, iterating over data[] and return insn->n. That's what the
INSN_WRITE instruction is meant to do although it's not implemented all
that consistently by the drivers.

--
-=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@mev.co.uk> )=-
-=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=-




\
 
 \ /
  Last update: 2012-06-27 12:21    [W:0.050 / U:0.480 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site