Add RTC driver for Seiko S35390A (used in the Meizu M3 and possibly other Meizus)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21539 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 93 insertions, 0 deletions

diff --git a/firmware/drivers/rtc/rtc_s35390a.c b/firmware/drivers/rtc/rtc_s35390a.c
new file mode 100644
index 0000000..5e0c909
--- /dev/null
+++ b/firmware/drivers/rtc/rtc_s35390a.c
@@ -0,0 +1,93 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2009 by Bertrik Sikken
+ * Copyright (C) 2008 by Robert Kukla 
+ * 
+ * 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 "rtc.h" 
+#include "i2c-s5l8700.h"
+
+/*  Driver for the Seiko S35390A real-time clock chip with i2c interface
+
+    This driver was derived from rtc_mr100.c and adapted for the S35390A
+    used in the Meizu M3 (and possibly others).
+ */
+
+#define RTC_ADDR   0x60
+
+#define STATUS_REG1     0
+#define STATUS_REG2     1
+#define REALTIME_DATA1  2
+#define REALTIME_DATA2  3
+#define INT1_REG        4
+#define INT2_REG        5
+#define CLOCK_CORR_REG  6
+#define FREE_REG        7
+
+
+static void reverse_bits(unsigned char* v, int size)
+{
+    static const unsigned char flipnibble[] =
+        {0x00, 0x08, 0x04, 0x0C, 0x02, 0x0A, 0x06, 0x0E,
+         0x01, 0x09, 0x05, 0x0D, 0x03, 0x0B, 0x07, 0x0F};
+    int i;
+                                            
+    for (i = 0; i < size; i++) {
+        v[i] = (flipnibble[v[i] & 0x0F] << 4) |
+                flipnibble[(v[i] >> 4) & 0x0F];
+    }
+}    
+
+void rtc_init(void)
+{
+    i2c_init();
+}
+
+int rtc_read_datetime(unsigned char* buf)
+{
+    unsigned char data[7];
+    int i, ret;
+
+    ret = i2c_read(RTC_ADDR | (REALTIME_DATA1 << 1), -1, sizeof(data), data);
+    reverse_bits(data, sizeof(data));
+
+    buf[4] &= 0x3f; /* mask out p.m. flag */
+    
+    for (i = 0; i < 7; i++) {
+        buf[i] = data[6 - i];
+    }
+    
+    return ret;
+}
+
+int rtc_write_datetime(unsigned char* buf)
+{
+    unsigned char data[7];
+    int i, ret;
+
+    for (i = 0; i < 7; i++) {
+        data[i] = buf[6 - i];
+    }
+        
+    reverse_bits(data, sizeof(data));
+    ret = i2c_write(RTC_ADDR | (REALTIME_DATA1 << 1), -1, sizeof(data), data);
+    
+    return ret;
+}
+