From: "Brett T. Warden" <brett.warden@gmail.com>
To: linux-kernel@vger.kernel.org, trivial@kernel.org
Subject: [PATCH] bw-qcam: adds parameter aggressive to skip passive detection and directly attempt initialization
Date: Tue, 4 Dec 2007 16:14:13 -0800 [thread overview]
Message-ID: <11968136532167-git-send-email-> (raw)
---
diff --git a/drivers/media/video/bw-qcam.c b/drivers/media/video/bw-qcam.c
index 5842352..b74a9cb 100644
--- a/drivers/media/video/bw-qcam.c
+++ b/drivers/media/video/bw-qcam.c
@@ -82,11 +82,16 @@ OTHER DEALINGS IN THE SOFTWARE.
static unsigned int maxpoll=250; /* Maximum busy-loop count for qcam I/O */
static unsigned int yieldlines=4; /* Yield after this many during capture */
static int video_nr = -1;
+static unsigned int aggressive; /* Whether to probe aggressively */
module_param(maxpoll, int, 0);
module_param(yieldlines, int, 0);
module_param(video_nr, int, 0);
+/* Set aggressive=1 to avoid detection by polling status register and
+ * immediately attempt to initialize qcam */
+module_param(aggressive, int, 0);
+
static inline int read_lpstatus(struct qcam_device *q)
{
return parport_read_status(q->pport);
@@ -331,6 +336,9 @@ static int qc_detect(struct qcam_device *q)
int count = 0;
int i;
+ if (aggressive)
+ return 1;
+
lastreg = reg = read_lpstatus(q) & 0xf0;
for (i = 0; i < 500; i++)
@@ -354,12 +362,12 @@ static int qc_detect(struct qcam_device *q)
/* Be (even more) liberal in what you accept... */
-/* if (count > 30 && count < 200) */
if (count > 20 && count < 400) {
return 1; /* found */
} else {
printk(KERN_ERR "No Quickcam found on port %s\n",
q->pport->name);
+ printk(KERN_DEBUG "Quickcam detection counter: %u\n", count);
return 0; /* not found */
}
}
next reply other threads:[~2007-12-05 0:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-05 0:14 Brett T. Warden [this message]
2007-12-05 17:37 ` [PATCH] bw-qcam: adds parameter aggressive to skip passive detection and directly attempt initialization Alan Cox
2007-12-05 18:31 ` Brett Warden
2007-12-06 20:55 ` Bill Davidsen
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