Add support for setting the clock using a special SCSI command. This is the same method that itunes uses, and there are host-side tools for it (e.g. libgpod)

Flyspray: FS#10514
Author: Laurent Papier and myself



git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22255 a1c6a512-1295-4272-9138-f99709370657

firmware/common/timefuncs.c

@@ -193,3 +193,42 @@ time_t mktime(struct tm *t)
     return(result);
 }
 #endif
+
+int day_of_week(int m, int d, int y)
+{
+        char mo[12] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
+
+        if(m == 0 || m == 1) y--;
+        return (d + mo[m] + y + y/4 - y/100 + y/400) % 7;
+}
+
+void yearday_to_daymonth(int yd, int y, int *d, int *m)
+{
+    short t[12] = { 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
+    int i;
+
+    if((y%4 == 0 && y%100 != 0) || y%400 == 0)
+    {
+        for(i=1;i<12;i++)
+            t[i]++;
+    }
+
+    yd++;
+    if(yd <= 31)
+    {
+        *d = yd;
+        *m = 0;
+    }
+    else
+    {
+        for(i=1;i<12;i++)
+        {
+            if(yd <= t[i])
+            {
+                *d = yd - t[i-1];
+                *m = i;
+                break;
+            }
+        }
+    }
+}

firmware/include/timefuncs.h

@@ -29,6 +29,8 @@
 struct tm *get_time(void);
 int set_time(const struct tm *tm);
 bool valid_time(const struct tm *tm);
+int day_of_week(int m, int d, int y);
+void yearday_to_daymonth(int yd, int y, int *d, int *m);
 #if CONFIG_RTC
 time_t mktime(struct tm *t);
 #endif

firmware/usbstack/usb_storage.c

@@ -31,6 +31,7 @@
 /* Needed to get at the audio buffer */
 #include "audio.h"
 #include "usb_storage.h"
+#include "timefuncs.h"
 
 
 /* Enable the following define to export only the SD card slot. This
@@ -68,8 +69,8 @@
 #define USB_BULK_RESET_REQUEST   0xff
 #define USB_BULK_GET_MAX_LUN     0xfe
 
-#define DIRECT_ACCESS_DEVICE	 0x00    /* disks */
-#define DEVICE_REMOVABLE	 0x80
+#define DIRECT_ACCESS_DEVICE	   0x00    /* disks */
+#define DEVICE_REMOVABLE         0x80
 
 #define CBW_SIGNATURE            0x43425355
 #define CSW_SIGNATURE            0x53425355
@@ -86,6 +87,7 @@
 #define SCSI_WRITE_10             0x2a
 #define SCSI_START_STOP_UNIT      0x1b
 #define SCSI_REPORT_LUNS          0xa0
+#define SCSI_WRITE_BUFFER         0x3b
 
 #define UMS_STATUS_GOOD            0x00
 #define UMS_STATUS_FAIL            0x01
@@ -270,6 +272,7 @@ static void send_command_result(void *data,int size);
 static void send_command_failed_result(void);
 static void send_block_data(void *data,int size);
 static void receive_block_data(void *data,int size);
+static void receive_time(void);
 static void fill_inquiry(IF_MD_NONVOID(int lun));
 static void send_and_read_next(void);
 static bool ejected[NUM_DRIVES];
@@ -288,6 +291,7 @@ static enum {
     SENDING_RESULT,
     SENDING_FAILED_RESULT,
     RECEIVING_BLOCKS,
+    RECEIVING_TIME,
     SENDING_CSW
 } state = WAITING_FOR_COMMAND;
 
@@ -459,6 +463,7 @@ void usb_storage_transfer_complete(int ep,int dir,int status,int length)
 {
     (void)ep;
     struct command_block_wrapper* cbw = (void*)cbw_buffer;
+    struct tm tm;
 
     //logf("transfer result %X %d", status, length);
     switch(state) {
@@ -602,6 +607,19 @@ void usb_storage_transfer_complete(int ep,int dir,int status,int length)
                 cur_sense_data.ascq=0;
             }
             break;
+        case RECEIVING_TIME:
+            tm.tm_year=(tb.transfer_buffer[0]<<8)+tb.transfer_buffer[1];
+            tm.tm_yday=(tb.transfer_buffer[2]<<8)+tb.transfer_buffer[3];
+            tb.transfer_buffer[8];
+            tm.tm_hour=tb.transfer_buffer[5];
+            tm.tm_min=tb.transfer_buffer[6];
+            tm.tm_sec=tb.transfer_buffer[7];
+            yearday_to_daymonth(tm.tm_yday,tm.tm_year,&tm.tm_mday,&tm.tm_mon);
+            tm.tm_wday=day_of_week(tm.tm_mon,tm.tm_mday,tm.tm_year);
+            tm.tm_year -= 1900;
+            set_time(&tm);
+            send_csw(UMS_STATUS_GOOD);
+            break;
     }
 }
 
@@ -1063,6 +1081,21 @@ static void handle_scsi(struct command_block_wrapper* cbw)
             }
             break;
 
+        case SCSI_WRITE_BUFFER:
+            if(cbw->command_block[1]==1
+            && cbw->command_block[2]==0
+            && cbw->command_block[3]==0x0c
+            && cbw->command_block[4]==0
+            && cbw->command_block[5]==0
+            && cbw->command_block[6]==0
+            && cbw->command_block[7]==0
+            /* Some versions of itunes set the next byte to 0. Technically
+             * it should be 0x0c */
+            && (cbw->command_block[8]==0 || cbw->command_block[8]==0x0c)
+            && cbw->command_block[9]==0)
+            receive_time();
+            break;
+
         default:
             logf("scsi unknown cmd %x",cbw->command_block[0x0]);
             send_csw(UMS_STATUS_FAIL);
@@ -1091,6 +1124,11 @@ static void send_command_failed_result(void)
     state = SENDING_FAILED_RESULT;
 }
 
+static void receive_time(void)
+{
+    usb_drv_recv(ep_out, tb.transfer_buffer, 12);
+    state = RECEIVING_TIME;
+}
 static void receive_block_data(void *data,int size)
 {
     usb_drv_recv(ep_out, data, size);