From 463b3ed8b2630d1b9d656dd2a52bbcbd429b4c08 Mon Sep 17 00:00:00 2001
From: Bertrik Sikken <bertrik@sikken.nl>
Date: Sat, 27 Aug 2011 16:21:19 +0000
Subject: Initial framework for the Sandisk Sansa Clip Zip

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30365 a1c6a512-1295-4272-9138-f99709370657
---
 .../arm/as3525/sansa-clipzip/button-clipzip.c      | 103 +++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 firmware/target/arm/as3525/sansa-clipzip/button-clipzip.c

(limited to 'firmware/target/arm/as3525/sansa-clipzip/button-clipzip.c')

diff --git a/firmware/target/arm/as3525/sansa-clipzip/button-clipzip.c b/firmware/target/arm/as3525/sansa-clipzip/button-clipzip.c
new file mode 100644
index 0000000000..104c227378
--- /dev/null
+++ b/firmware/target/arm/as3525/sansa-clipzip/button-clipzip.c
@@ -0,0 +1,103 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2008 François Dinel
+ * Copyright ©   2008-2009 Rafaël Carré
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+
+#include "button-target.h"
+#include "as3525v2.h"
+#include "kernel.h"
+#include "system-target.h"
+
+void button_init_device(void)
+{
+    /* GPIO A6, A7 and D6 are direct button inputs */
+    GPIOA_DIR &= ~(1 << 6);
+    GPIOA_DIR &= ~(1 << 7);
+    GPIOD_DIR &= ~(1 << 6);
+    
+    /* GPIO C1, C2, C3, C4, C5 are used in a column/row key scan matrix */
+    GPIOC_DIR |= ((1 << 1) | (1 << 2));
+    GPIOC_DIR &= ~((1 << 3) | (1 << 4) | (1 << 5));
+}
+
+/*  TODO:
+    Instead of using udelay to wait for buttons to settle, we could use a
+    simple state machine to alternate between key matrix rows (like we do on
+    the clip) and this way avoid burning cycles in the udelay.
+    
+    TODO:
+    Figure out the real mappings from GPIOs to buttons.
+    The current mapping is just an educated guess.
+*/
+int button_read_device(void)
+{
+    int buttons = 0;
+
+    /* power */
+    if (GPIOD_PIN(6)) {
+        buttons |= BUTTON_POWER;
+    }
+
+    /* volume */
+    if (GPIOA_PIN(6)) {
+        buttons |= BUTTON_VOL_DOWN;
+    }
+    if (GPIOA_PIN(7)) {
+        buttons |= BUTTON_VOL_UP;
+    }
+
+    /* key matrix buttons, first row */
+    GPIOC_PIN(1) = (1 << 1);
+    GPIOC_PIN(2) = 0;
+    udelay(500);
+    
+    if (GPIOC_PIN(3)) {
+        buttons |= BUTTON_LEFT;
+    }
+    if (GPIOC_PIN(4)) {
+        buttons |= BUTTON_SELECT;
+    }
+    if (GPIOC_PIN(5)) {
+        buttons |= BUTTON_RIGHT;
+    }
+    
+    /* key matrix buttons, second row */
+    GPIOC_PIN(1) = 0;
+    GPIOC_PIN(2) = (1 << 2);
+    udelay(500);
+    
+    if (GPIOC_PIN(3)) {
+        buttons |= BUTTON_UP;
+    }
+    if (GPIOC_PIN(4)) {
+        buttons |= BUTTON_HOME;
+    }
+    if (GPIOC_PIN(5)) {
+        buttons |= BUTTON_DOWN;
+    }
+    
+    /* deselect scan rows */
+    GPIOC_PIN(2) = 0;
+
+    return buttons;
+}
+
-- 
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