On Thursday, January 29, 2009 5:58 PM, David Brownell wrote:
> On Thursday 29 January 2009, hartleys wrote:
> > > +/* Boards have uniqe mappings of {col, row} --> keycode.
> > > + * Column and row are 4 bits, but range only from 0..7;
> > > + * a PERSISTENT_KEY is "always on" and never reported.
> > > + */
> > > +#define KEY_PERSISTENT 0x00800000 #define KEY(col,
> > > +row, keycode) (((col) << 28) | ((row) << 24) |
> > (keycode))
> >
> > The same KEY macro is defined in:
> >
> > arch/arm/mach-pxa/include/mach/pxa27x_keypad.h
> > arch/arm/plat-omap/include/mach/keypad.h
>
> I copied it from the OMAP version as part of removing needless OMAP
> dependencies from this driver.
Makes sense.
> > I also have a keypad driver for the ep93xx that uses the same macro.
> >
> > Shouldn't/couldn't this be generalized and added to the
> > include/linux/input.h file? Allowing 4-bits for row/col gives a
> > maximum key matrix of 16x16 keys which should be enough for just
> > about anything.
>
> Makes sense. But that's not what this patch is about, and I also
> think the KEY prefix is probably too generic.
Understand. Just noticed the common macro and wondered if something should be
done to generalize it.
> I'd support an overall cleanup patch that fixes all those things at once.
How's this for a starting point? I'm willing to create a cleanup patch for all
the mach-omap1, mach-omap2, and mach-pxa users.
Signed-off-by: H Hartley Sweeten <[email protected]>
---
diff --git a/include/linux/input.h b/include/linux/input.h
index 1249a0c..0879493 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -598,6 +598,14 @@ struct input_absinfo {
#define KEY_CNT (KEY_MAX+1)
/*
+ * Macro to pack the row/col of a key on a matrix keypad and it's associated
+ * KEY_* code into into an array. 4 bits are used for both the row and column
+ * allowing for up to a 16x16 keypad. The row (_r) and column (_c) are
+ * interchangable depending on a keypad drivers usage.
+ */
+#define MATRIX_KEY(_r, _c, _v) (((_r) << 28) | ((_c) << 24) | (_v))
+
+/*
* Relative axes
*/
--
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