linux-kernel - Re: [PATCH] bw-qcam: use data_reverse instead of manually poking the control register

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Message-ID: <a372714f0709261306q714100e3t643b31d8f194de2e@mail.gmail.com>
Date:	Wed, 26 Sep 2007 13:06:59 -0700
From:	"Brett Warden" <brett.warden@...il.com>
To:	"Ray Lee" <ray-lk@...rabbit.org>
Cc:	linux-kernel@...r.kernel.org, trivial@...nel.org
Subject: Re: [PATCH] bw-qcam: use data_reverse instead of manually poking the control register

On 9/26/07, Ray Lee <ray-lk@...rabbit.org> wrote:

> Just as an aside, if you've tested this and it works, then there's no
> point to keep the write_lpcontrol even as a comment. Kill those four
> lines, and if someone's interested in what happened they'll just look
> at the file history.

Point taken, thanks for the feedback.

---

diff --git a/drivers/media/video/bw-qcam.c b/drivers/media/video/bw-qcam.c
index 7d47cbe..0ba92e3 100644
--- a/drivers/media/video/bw-qcam.c
+++ b/drivers/media/video/bw-qcam.c
@@ -107,6 +107,11 @@ static inline void write_lpcontrol(struct
qcam_device *q, int d)
        parport_write_control(q->pport, d);
 }

+static inline void reverse_port(struct qcam_device *q)
+{
+       parport_data_reverse(q->pport);
+}
+
 static int qc_waithand(struct qcam_device *q, int val);
 static int qc_command(struct qcam_device *q, int command);
 static int qc_readparam(struct qcam_device *q);
@@ -369,7 +374,7 @@ static void qc_reset(struct qcam_device *q)
                        break;

                case QC_ANY:
-                       write_lpcontrol(q, 0x20);
+                       reverse_port(q);
                        write_lpdata(q, 0x75);

                        if (read_lpdata(q) != 0x75) {
@@ -512,10 +517,12 @@ static inline int qc_readbytes(struct
qcam_device *q, char buffer[])
        switch (q->port_mode & QC_MODE_MASK)
        {
                case QC_BIDIR:          /* Bi-directional Port */
-                       write_lpcontrol(q, 0x26);
+                       reverse_port(q);
+                       write_lpcontrol(q, 0x6);
                        lo = (qc_waithand2(q, 1) >> 1);
                        hi = (read_lpstatus(q) >> 3) & 0x1f;
-                       write_lpcontrol(q, 0x2e);
+                       reverse_port(q);
+                       write_lpcontrol(q, 0xe);
                        lo2 = (qc_waithand2(q, 0) >> 1);
                        hi2 = (read_lpstatus(q) >> 3) & 0x1f;
                        switch (q->bpp)
@@ -613,10 +620,13 @@ static long qc_capture(struct qcam_device * q,
char __user *buf, unsigned long l

        if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR)
        {
-               write_lpcontrol(q, 0x2e);       /* turn port around */
-               write_lpcontrol(q, 0x26);
+               reverse_port(q);                        /* turn port around */
+               write_lpcontrol(q, 0xe);
+               reverse_port(q);
+               write_lpcontrol(q, 0x6);
                (void) qc_waithand(q, 1);
-               write_lpcontrol(q, 0x2e);
+               reverse_port(q);
+               write_lpcontrol(q, 0xe);
                (void) qc_waithand(q, 0);
        }




-- 
Brett Warden
-
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