[src/trunk]: src/sys/dev/usb uep: allow (hard-coded) calibration.

[maya <maya%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2da057c20369
branches:  trunk
changeset: 349303:2da057c20369
user:      maya <maya%NetBSD.org@localhost>
date:      Mon Dec 05 13:14:22 2016 +0000

description:
uep: allow (hard-coded) calibration.

>From Nicolas Jouanne in PR kern/40105
ok skrll

diffstat:

 sys/dev/usb/uep.c |  27 +++++++++++++++++++++++----
 1 files changed, 23 insertions(+), 4 deletions(-)

diffs (62 lines):

diff -r 9d2bb9c662ee -r 2da057c20369 sys/dev/usb/uep.c
--- a/sys/dev/usb/uep.c Mon Dec 05 12:42:33 2016 +0000
+++ b/sys/dev/usb/uep.c Mon Dec 05 13:14:22 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uep.c,v 1.20 2016/04/23 10:15:32 skrll Exp $   */
+/*     $NetBSD: uep.c,v 1.21 2016/12/05 13:14:22 maya Exp $    */
 
 /*
  * Copyright (c) 2004 The NetBSD Foundation, Inc.
@@ -33,7 +33,7 @@
  *  eGalax USB touchpanel controller driver.
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uep.c,v 1.20 2016/04/23 10:15:32 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uep.c,v 1.21 2016/12/05 13:14:22 maya Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -54,6 +54,14 @@
 #include <dev/wscons/tpcalibvar.h>
 
 #define UIDSTR "eGalax USB SN000000"
+/* calibration - integer values, perhaps sysctls?  */
+#define X_RATIO   293 
+#define X_OFFSET  -28
+#define Y_RATIO   -348
+#define Y_OFFSET  537
+/* an X_RATIO of ``312''  means : reduce by a factor 3.12 x axis amplitude */
+/* an Y_RATIO of ``-157'' means : reduce by a factor 1.57 y axis amplitude,
+ * and reverse y motion */
 
 struct uep_softc {
        device_t sc_dev;
@@ -358,6 +366,17 @@
        return EPASSTHROUGH;
 }
 
+static int
+uep_adjust(int v, int off, int rat)
+{
+       int num = 100 * v;
+       int quot = num / rat;
+       int rem = num % rat;
+       if (num >= 0 && rem < 0)
+               quot++;
+       return quot + off;
+}
+
 void
 uep_intr(struct usbd_xfer *xfer, void *addr, usbd_status status)
 {
@@ -429,8 +448,8 @@
                default:
                        msk = 0x0f;     /* H=0, L=0 */
                }
-               x = ((p[3] & msk) << 7) | p[4];
-               y = ((p[1] & msk) << 7) | p[2];
+               x = uep_adjust(((p[3] & msk) << 7) | p[4], X_OFFSET, X_RATIO);
+               y = uep_adjust(((p[1] & msk) << 7) | p[2], Y_OFFSET, Y_RATIO);
 
                tpcalib_trans(&sc->sc_tpcalib, x, y, &x, &y);