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SubjectRe: [PATCH] bw-qcam: use data_reverse instead of manually poking the control register
On 9/26/07, Ray Lee <ray-lk@madrabbit.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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