FS#10569 RTC driver cleanup

Change the RTC drivers so that the rtc_(read|write)_datetime functions now deal directly with the tm struct instead of passing a string of bcd digits to/from (set|get)_time .
This simplifies drivers for rtc's that do not use a bcd representation internally and cleans up some target specific code and #ifdefs in generic code. Implement simple stubs for the sim to avoid #ifdefing for that too.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22839 a1c6a512-1295-4272-9138-f99709370657

firmware/drivers/rtc/rtc_as3514.c

@@ -38,9 +38,6 @@
 #define YEAR_SECONDS        31536000
 #define LEAP_YEAR_SECONDS   31622400
 
-#define BCD2DEC(X)          (((((X)>>4) & 0x0f) * 10) + ((X) & 0xf))
-#define DEC2BCD(X)          ((((X)/10)<<4) | ((X)%10))
-
 /* Days in each month */
 static unsigned int days_in_month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
 
@@ -56,31 +53,30 @@ void rtc_init(void)
 {
 }
 
-int rtc_read_datetime(unsigned char* buf)
+int rtc_read_datetime(struct tm *tm)
 {
     char tmp[4];
-    int year;
-    int i;
+    int i, year, mday, hour, min;
     unsigned int seconds;
-    
+
     /* RTC_AS3514's slave address is 0x46*/
-    for (i=0;i<4;i++){
+    for (i = 0; i < 4; i++){
         tmp[i] = ascodec_read(AS3514_RTC_0 + i);
     }
     seconds = tmp[0] + (tmp[1]<<8) + (tmp[2]<<16) + (tmp[3]<<24);
     seconds -= SECS_ADJUST;
-    
+
     /* Convert seconds since Jan-1-1980 to format compatible with
      * get_time() from firmware/common/timefuncs.c */
-    
+
     /* weekday */
-    buf[3] = ((seconds % WEEK_SECONDS) / DAY_SECONDS + 2) % 7;
-    
+    tm->tm_wday = ((seconds % WEEK_SECONDS) / DAY_SECONDS + 2) % 7;
+
     /* Year */
     year = 1980;
-    while(seconds>=LEAP_YEAR_SECONDS)
+    while (seconds >= LEAP_YEAR_SECONDS)
     {
-        if(is_leapyear(year)){
+        if (is_leapyear(year)){
             seconds -= LEAP_YEAR_SECONDS;
         } else {
             seconds -= YEAR_SECONDS;
@@ -88,8 +84,8 @@ int rtc_read_datetime(unsigned char* buf)
 
         year++;
     }
-    
-    if(is_leapyear(year)) {
+
+    if (is_leapyear(year)) {
         days_in_month[1] = 29;
     } else {
         days_in_month[1] = 28;
@@ -98,54 +94,48 @@ int rtc_read_datetime(unsigned char* buf)
             seconds -= YEAR_SECONDS;
         }
     }
-    buf[6] = year%100;
-    
+    tm->tm_year = year%100 + 100;
+
     /* Month */
-    for(i=0; i<12; i++)
+    for (i = 0; i < 12; i++)
     {
-        if(seconds < days_in_month[i]*DAY_SECONDS){
-            buf[5] = i+1;
+        if (seconds < days_in_month[i]*DAY_SECONDS){
+            tm->tm_mon = i;
             break;
         }
-        
+
         seconds -= days_in_month[i]*DAY_SECONDS;
     }
-    
+
     /* Month Day */
-    buf[4] = seconds/DAY_SECONDS;
-    seconds -= buf[4]*DAY_SECONDS;
-    buf[4]++; /* 1 ... 31 */
+    mday = seconds/DAY_SECONDS;
+    seconds -= mday*DAY_SECONDS;
+    tm->tm_mday = mday + 1; /* 1 ... 31 */
 
     /* Hour */
-    buf[2] = seconds/HOUR_SECONDS;
-    seconds -= buf[2]*HOUR_SECONDS;
-    
+    hour = seconds/HOUR_SECONDS;
+    seconds -= hour*HOUR_SECONDS;
+    tm->tm_hour = hour;
+
     /* Minute */
-    buf[1] = seconds/MINUTE_SECONDS;
-    seconds -= buf[1]*MINUTE_SECONDS;
-    
+    min = seconds/MINUTE_SECONDS;
+    seconds -= min*MINUTE_SECONDS;
+    tm->tm_min = min;
+
     /* Second */
-    buf[0] = seconds;
-    
-    /* Convert to Binary Coded Decimal format */
-    for(i=0; i<7; i++)
-        buf[i] = DEC2BCD(buf[i]);
-    
+    tm->tm_sec = seconds;
+
     return 7;
 }
 
-int rtc_write_datetime(unsigned char* buf)
+int rtc_write_datetime(const struct tm *tm)
 {
     int i, year;
     unsigned int year_days = 0;
     unsigned int month_days = 0;
     unsigned int seconds = 0;
-    
-    /* Convert from Binary Coded Decimal format */
-    for(i=0; i<7; i++)
-        buf[i] = BCD2DEC(buf[i]);   
 
-    year = 2000 + buf[6];
+    year = 2000 + tm->tm_year - 100;
 
     if(is_leapyear(year)) {
         days_in_month[1] = 29;
@@ -154,24 +144,24 @@ int rtc_write_datetime(unsigned char* buf)
     }
     
     /* Number of days in months gone by this year*/
-    for(i=0; i<(buf[5]-1); i++){
+    for(i = 0; i < tm->tm_mon; i++){
         month_days += days_in_month[i];
     }
     
     /* Number of days in years gone by since 1-Jan-1980 */
-    year_days = 365*(buf[6]+20) + (buf[6]-1)/4 + 6;
+    year_days = 365*(tm->tm_year+20) + (tm->tm_year-1)/4 + 6;
 
     /* Convert to seconds since 1-Jan-1980 */
-    seconds = buf[0]
-            + buf[1]*MINUTE_SECONDS
-            + buf[2]*HOUR_SECONDS
-            + (buf[4]-1)*DAY_SECONDS
+    seconds = tm->tm_sec
+            + tm->tm_min*MINUTE_SECONDS
+            + tm->tm_hour*HOUR_SECONDS
+            + (tm->tm_mday-1)*DAY_SECONDS
             + month_days*DAY_SECONDS
             + year_days*DAY_SECONDS;
     seconds += SECS_ADJUST;
 
     /* Send data to RTC */
-    for (i=0;i<4;i++){
+    for (i=0; i<4; i++){
         ascodec_write(AS3514_RTC_0 + i, ((seconds >> (8 * i)) & 0xff));
     }
     return 1;