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Date: Mon, 28 Mar 2022 14:02:09 -0700
From: Joe Perches <joe@...ches.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
Benjamin Stürz <benni@...erz.xyz>
Cc: Michael Krufky <mkrufky@...uxtv.org>, linux-kernel@...r.kernel.org,
linux-media@...r.kernel.org
Subject: Re: [PATCH 00/26] dvb-usb: use designated initializers
(adding Benjamin Stürz and link to series)
https://lore.kernel.org/all/cover.1648499509.git.mchehab@kernel.org/
On Mon, 2022-03-28 at 22:41 +0200, Mauro Carvalho Chehab wrote:
> There are two DVB USB cores on media. The new one (dvb-usb-v2)
> solves several problems with the previous one, but, unfortunately,
> there are several drivers that weren't migrated yet.
>
> One of the problems with dvb-usb is that, besides the common
> DVB USB table, it also uses a per-device table which require
> links to the USB ID table.
>
> This is done, on most drivers, using a magic number, which is easy
> to get outdated.
>
> Rewrite the drivers in order to use an enum and use designated
> initializers where needed.
>
> This patch series was inspired on this patch:
> https://patchwork.kernel.org/project/linux-media/patch/20220326165909.506926-16-benni@stuerz.xyz/
>
> While it would be nice to also change the tables to be const, this
> is currently not possible, as a couple drivers that depend on the
> dvb-usb struct depend on it to not be const.
>
> Writing a patch series like that and making it properly referencing
> the right entries is not fun. That's most drivers were never fixed.
> So, I ended using a script to change it, adding several checks on
> it, in order to avoid the risk of problems.
fancy script, nice...
>
> Even so, I needed to manually adjust some patches.
>
> This is the used script:
>
> <script>
> #!/usr/bin/perl
> use strict;
> use warnings;
> use Text::Tabs;
> use File::Find;
>
> my $usb_id_pre = "";
> my $usb_id_end = "";
>
> my %vid;
> my %pid;
>
> my %pid_count;
>
> my $state = "pre";
>
> sub out_ids()
> {
> open OUT, "> include/media/dvb-usb-ids.h" or die;
> print OUT $usb_id_pre;
> foreach my $k(sort keys %vid) {
> my $ln = sprintf "#define USB_VID_%-31s %s\n", $k, $vid{$k};
> $ln = unexpand($ln);
> print OUT $ln;
> }
>
> print OUT "\n/* Product IDs */\n\n";
> foreach my $k(sort keys %pid) {
> my $ln = sprintf "#define USB_PID_%-39s %s\n", $k, $pid{$k};
> $ln = unexpand($ln);
> print OUT $ln;
> }
> print OUT $usb_id_end;
> close OUT;
> }
>
> my @enum;
>
> sub validate_model($$)
> {
> my $my_vid = $1;
> my $my_pid = $2;
>
> if (!$vid{$my_vid}) {
> print "$.# ERROR! VID: $my_vid\n";
> return "";
> }
>
> if (!$pid{$my_pid}) {
> print "$.# ERROR! PID: $my_pid\n";
> return "";
> }
>
> my $tmp_vid = $my_vid;
> $tmp_vid =~ s/_ELECTRONIC$//;
> $tmp_vid =~ s/_MICRO$//;
> $tmp_vid =~ s/_1$//;
> $tmp_vid =~ s/_2$//;
> $tmp_vid =~ s/_UNK$//;
> $tmp_vid =~ s/GTEK/GENIATECH/;
>
> # Change model name to be different
> my $model = $tmp_vid . "_" . $my_pid;
>
> return $my_pid if ($my_pid =~ /$tmp_vid[_]/ && !grep(/^$my_pid$/, @enum));
>
> print "NEW model: $model\n";
>
> # Add the new PID to include/media/dvb-usb-ids.h
> $pid{$model} = $pid{$my_pid};
>
> $pid_count{$my_pid}--;
>
> # Drop unused PIDs
> if (!$pid_count{$my_pid}) {
> delete ($pid{$my_pid});
> print "Drop: $my_pid\n";
> }
>
> return $model if (!grep(/^$model$/, @enum));
>
> print "$.# ERROR! Model $model aready exists\n";
> return "";
> }
>
> sub count_pid()
> {
> my $file = $File::Find::name;
>
> return if (!($file =~ /[.][ch]/));
>
> open IN, $file or die "Can't open $file";
> while (<IN>) {
> if (/USB_PID_([\w\_]+)/) {
> $pid_count{$1}++;
> next;
> }
> }
> close IN;
> }
>
> open IN, "include/media/dvb-usb-ids.h" or die;
> while (<IN>) {
> if (/#define\s+USB_VID_(\S+)\s+(\S+)/) {
> $state = "vid";
> $vid{$1} = $2;
> #print "VID: $1 -> $2\n";
> next;
> }
> if (/#define\s+USB_PID_(\S+)\s+(\S+)/) {
> $state = "pid";
> $pid{$1} = $2;
> #print "PID: $1 -> $2\n";
> next;
> }
>
> if ($state eq "pre") {
> $usb_id_pre .= $_;
> } elsif ($state eq "pid") {
> $usb_id_end .= $_;
> }
> }
> close IN;
>
> find({wanted => \&count_pid, no_chdir => 1}, "drivers/media/usb/");
>
>
> while (scalar @ARGV) {
> @enum = ();
> my @dev_id;
>
>
> my $usb_dev_id_table;
> my $out = "";
> my $should_write = 1;
>
> my $file = $ARGV[0];
>
> print "Processing $file...\n";
>
> open IN, $file or die "Can't open $1";
>
> my $entry = "";
>
> my $pos = 0;
>
> while (<IN>) {
> if (m/struct\s.*usb_device_id\s+([\w\_]+).*{/) {
> $usb_dev_id_table = $1;
> }
> if (!$usb_dev_id_table) {
> $out .= $_;
> next;
> }
>
> if (m,\/\*\s*(\d+)\s*\*\/,) {
> if ($1 != $pos) {
> printf "$.# ERROR! Count is wrong! Want %d, got %d\n", $pos, $1;
> $should_write = 0;
> last;
> }
> }
>
> $pos++ if (m/USB_DEVICE/);
>
> last if (m/^}\s*;/);
>
> $entry .= $_;
> next if (!(m/}\s*,/));
>
> if ($entry =~ m/USB_DEVICE\(USB_VID_([\w\_]+)\s*,\s*USB_PID_([\w\_]+)/) {
> my $my_vid = $1;
> my $my_pid = $2;
>
> my $model = validate_model($my_vid, $my_pid);
> if ($model eq "") {
> $should_write = 0;
> last;
> }
>
> push @enum, $model;
> push @dev_id, "DVB_USB_DEV($my_vid, $model)";
> print "DVB_USB_DEV($my_vid, $model)\n";
> }
> if ($entry =~ m/USB_DEVICE_VER\(USB_VID_([\w\_]+)\s*,\s*USB_PID_([\w\_]+)\s*,\s*(\w+)\s*,\s*(\w+)/) {
> my $my_vid = $1;
> my $my_pid = $2;
> my $lo = $3;
> my $hi = $4;
>
> my $model = validate_model($my_vid, $my_pid);
> if ($model eq "") {
> $should_write = 0;
> last;
> }
>
> push @enum, $model;
> push @dev_id, "DVB_USB_DEV_VER($my_vid, $model, $lo, $hi)";
> print "DVB_USB_DEV_VER($my_vid, $model, $lo, $hi)\n";
> }
> $entry = "";
> }
>
> if ($should_write && scalar(@enum) != $pos) {
> printf "ERROR! Count is wrong! Want %d, got %d\n", $pos, scalar(@enum);
> $should_write = 0;
> }
>
> if ($usb_dev_id_table && $should_write) {
> $out .= "enum {\n";
> for my $e (@enum) {
> $out .= "\t$e,\n";
> }
> $out .= "};\n\n";
>
> $out .= "static struct usb_device_id $usb_dev_id_table\[\] = {\n";
> for my $e (@dev_id) {
> $out .= "\t$e,\n";
> }
> $out .= "\t{ }\n";
> $out .= "};\n\n";
>
> my $start = 1;
>
> while (<IN>) {
> next if ($start && m/^$/);
> $start = 0;
> while (m/$usb_dev_id_table\[(\d+)\]/g) {
> my $i = $1;
>
> if ($1 > scalar @enum) {
> print "ERROR! $usb_dev_id_table element $1 doesn't exist!\n";
> $should_write = 0;
> last;
> }
>
> my $idx = $enum[$1];
>
> if (!(s,($usb_dev_id_table)\[$i\],$1\[$idx],g)) {
> print "ERROR! can't replace $1!\n";
> $should_write = 0;
> last;
> }
> }
> $out .= $_;
> }
> close IN;
> } else {
> while (<IN>) {
> $out .= $_;
> }
> print "\tunchanged\n";
> $should_write = 0;
> }
>
> if ($should_write || $file eq "include/media/dvb-usb-ids.h") {
> open OUT, ">$file" or die "Can't write on file $file";
> print OUT $out;
> close OUT;
> printf "\twrote\n";
>
> out_ids();
> }
>
> shift @ARGV;
> }
> </script>
>
>
> Mauro Carvalho Chehab (26):
> media: dvb-usb-ids.h: sort entries
> media: dvb-usb: move USB IDs to dvb-usb-ids.h
> media: dvb-usb: vp702x: reference to usb ID table
> media: dvb-usb: Add helper macros for using USB VID/PID
> media: dvb-usb: a800: use an enum for the device number
> media: af9005: use the newer dvb-usb macros for USB device
> media: dvb-usb: az6027: use an enum for the device number
> media: cinergyT2-core: use the newer dvb-usb macros for USB device
> media: cxusb: use the newer dvb-usb macros for USB device
> media: digitv: use the newer dvb-usb macros for USB device
> media: dvb-usb: dtt200u: use an enum for the device number
> media: dtv5100: use the newer dvb-usb macros for USB device
> media: dw2102: use the newer dvb-usb macros for USB device
> media: dvb-usb: gp8psk: use an enum for the device number
> media: dvb-usb: m920x: use an enum for the device number
> media: dvb-usb: nova-t-usb2: use an enum for the device number
> media: dvb-usb: opera1: use an enum for the device number
> media: dvb-usb: pctv452e: use an enum for the device number
> media: technisat-usb2: use the newer dvb-usb macros for USB device
> media: dvb-usb: ttusb2: use an enum for the device number
> media: dvb-usb: umt-010: use an enum for the device number
> media: dvb-usb: vp702x: use an enum for the device number
> media: dvb-usb: vp7045: use an enum for the device number
> media: dvb-usb: dibusb-mb: use an enum for the device number
> media: dvb-usb: dibusb-mc: use an enum for the device number
> media: dvb-usb: dib0700_devices: use an enum for the device number
>
> drivers/media/usb/dvb-usb/a800.c | 18 +-
> drivers/media/usb/dvb-usb/af9005.c | 19 +-
> drivers/media/usb/dvb-usb/az6027.c | 45 +-
> drivers/media/usb/dvb-usb/cinergyT2-core.c | 10 +-
> drivers/media/usb/dvb-usb/cxusb.c | 88 +--
> drivers/media/usb/dvb-usb/dib0700_devices.c | 428 +++++++------
> drivers/media/usb/dvb-usb/dibusb-mb.c | 165 ++---
> drivers/media/usb/dvb-usb/dibusb-mc.c | 88 +--
> drivers/media/usb/dvb-usb/digitv.c | 13 +-
> drivers/media/usb/dvb-usb/dtt200u.c | 56 +-
> drivers/media/usb/dvb-usb/dtv5100.c | 11 +-
> drivers/media/usb/dvb-usb/dw2102.c | 84 ++-
> drivers/media/usb/dvb-usb/gp8psk.c | 36 +-
> drivers/media/usb/dvb-usb/m920x.c | 51 +-
> drivers/media/usb/dvb-usb/nova-t-usb2.c | 18 +-
> drivers/media/usb/dvb-usb/opera1.c | 15 +-
> drivers/media/usb/dvb-usb/pctv452e.c | 22 +-
> drivers/media/usb/dvb-usb/technisat-usb2.c | 11 +-
> drivers/media/usb/dvb-usb/ttusb2.c | 36 +-
> drivers/media/usb/dvb-usb/umt-010.c | 18 +-
> drivers/media/usb/dvb-usb/vp702x.c | 23 +-
> drivers/media/usb/dvb-usb/vp7045.c | 28 +-
> include/media/dvb-usb-ids.h | 632 +++++++++++---------
> 23 files changed, 1071 insertions(+), 844 deletions(-)
>
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