V4L/DVB (12181): get_dvb_firmware: Add Yuan MPC718 MT352 DVB-T "firmware" extraction

Add routine to support extracting the MT352 DVB-T demodulator initialization
sequence for Yuan MPC718 cards for use by the cx18 driver.

This routine uses a hueristic for extracting a good sequence.  It should work
on all different versions of the "yuanrap.sys" file, given the way the MT352
tuning sequences are stored in all versions of that file I have seen so far.
However, the current patch simply looks for one specific archive URL.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 51 insertions, 1 deletions

diff --git a/Documentation/dvb/get_dvb_firmware b/Documentation/dvb/get_dvb_firmware
index a52adfc9a57f..64174d6258f0 100644
--- a/Documentation/dvb/get_dvb_firmware
+++ b/Documentation/dvb/get_dvb_firmware
@@ -25,7 +25,7 @@ use IO::Handle;
                 "tda10046lifeview", "av7110", "dec2000t", "dec2540t",
                 "dec3000s", "vp7041", "dibusb", "nxt2002", "nxt2004",
                 "or51211", "or51132_qam", "or51132_vsb", "bluebird",
-                "opera1", "cx231xx", "cx18", "cx23885", "pvrusb2" );
+                "opera1", "cx231xx", "cx18", "cx23885", "pvrusb2", "mpc718" );
 
 # Check args
 syntax() if (scalar(@ARGV) != 1);
@@ -381,6 +381,56 @@ sub cx18 {
     $allfiles;
 }
 
+sub mpc718 {
+    my $archive = 'Yuan MPC718 TV Tuner Card 2.13.10.1016.zip';
+    my $url = "ftp://ftp.work.acer-euro.com/desktop/aspire_idea510/vista/Drivers/$archive";
+    my $fwfile = "dvb-cx18-mpc718-mt352.fw";
+    my $tmpdir = tempdir(DIR => "/tmp", CLEANUP => 1);
+
+    checkstandard();
+    wgetfile($archive, $url);
+    unzip($archive, $tmpdir);
+
+    my $sourcefile = "$tmpdir/Yuan MPC718 TV Tuner Card 2.13.10.1016/mpc718_32bit/yuanrap.sys";
+    my $found = 0;
+
+    open IN, '<', $sourcefile or die "Couldn't open $sourcefile to extract $fwfile data\n";
+    binmode IN;
+    open OUT, '>', $fwfile;
+    binmode OUT;
+    {
+        # Block scope because we change the line terminator variable $/
+        my $prevlen = 0;
+        my $currlen;
+
+        # Buried in the data segment are 3 runs of almost identical
+        # register-value pairs that end in 0x5d 0x01 which is a "TUNER GO"
+        # command for the MT352.
+        # Pull out the middle run (because it's easy) of register-value
+        # pairs to make the "firmware" file.
+
+        local $/ = "\x5d\x01"; # MT352 "TUNER GO"
+
+        while (<IN>) {
+            $currlen = length($_);
+            if ($prevlen == $currlen || $currlen <= 64) {
+                chop; chop; # Get rid of "TUNER GO"
+                s/^\0\0//;  # get rid of leading 00 00 if it's there
+                printf OUT "$_";
+                $found = 1;
+                last;
+            }
+        }
+    }
+    close OUT;
+    close IN;
+    if (!$found) {
+        unlink $fwfile;
+        die "Couldn't find valid register-value sequence in $sourcefile for $fwfile\n";
+    }
+    $fwfile;
+}
+
 sub cx23885 {
     my $url = "http://linuxtv.org/downloads/firmware/";