On 9/26/07, Brett Warden <[email protected]> wrote:
> On 9/26/07, Ray Lee <[email protected]> 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);
> }
Better, and do you have time for two (possibly stupid) questions? In
each of the last cases it looks like the transformation is from a
write_lpcontrol -> reverse_port and a write_lpcontrol (old address -
0x20). Except the first one, which merely has the reverse_port. One
would think that there should be a write_lpcontrol(q, 0x0); after that
one.
Also, is the reverse port sticky, or does it only apply to the next
write? If it's only the next, then maybe a different name would be
better. If it's sticky, then I think the code is wrong...
Ray
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
