From 67230d58a4c17c268964c3ea3395adf7a3cd2dff Mon Sep 17 00:00:00 2001
From: Jason Lenz <Jason@Lenzplace.org>
Date: Thu, 18 Mar 2021 20:12:15 -0500
Subject: [PATCH 1/2] epkowa: add epson perfection v600 photo

---
 pkgs/misc/drivers/epkowa/default.nix | 29 ++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/pkgs/misc/drivers/epkowa/default.nix b/pkgs/misc/drivers/epkowa/default.nix
index ae8749f0326..dc0fa8bf9cd 100644
--- a/pkgs/misc/drivers/epkowa/default.nix
+++ b/pkgs/misc/drivers/epkowa/default.nix
@@ -99,6 +99,35 @@ let plugins = {
     };
     meta = common_meta // { description = "Plugin to support " + passthru.hw + " scanner in sane"; };
   };
+  v600 = stdenv.mkDerivation rec {
+    pname = "iscan-gt-x820-bundle";
+    version = "2.30.4";
+
+    nativeBuildInputs = [ autoPatchelfHook rpm ];
+    src = fetchurl {
+      urls = [
+        "https://download2.ebz.epson.net/iscan/plugin/gt-x820/rpm/x64/iscan-gt-x820-bundle-${version}.x64.rpm.tar.gz"
+        "https://web.archive.org/web/https://download2.ebz.epson.net/iscan/plugin/gt-x820/rpm/x64/iscan-gt-x820-bundle-${version}.x64.rpm.tar.gz"
+      ];
+      sha256 = "1vlba7dsgpk35nn3n7is8nwds3yzlk38q43mppjzwsz2d2n7sr33";
+    };
+    installPhase = ''
+      cd plugins
+      ${rpm}/bin/rpm2cpio iscan-plugin-gt-x820-*.x86_64.rpm | ${cpio}/bin/cpio -idmv
+      mkdir $out
+      cp -r usr/share $out
+      cp -r usr/lib64 $out/lib
+      mv $out/share/iscan $out/share/esci
+      mv $out/lib/iscan $out/lib/esci
+    '';
+    passthru = {
+      registrationCommand = ''
+        $registry --add interpreter usb 0x04b8 0x013a "$plugin/lib/esci/libesintA1 $plugin/share/esci/esfwA1.bin"
+      '';
+      hw = "Perfection V600 Photo";
+    };
+    meta = common_meta // { description = "iscan esci x820 plugin for " + passthru.hw; };
+  };
   x770 = stdenv.mkDerivation rec {
     pname = "iscan-gt-x770-bundle";
     version = "2.30.4";

From 5f0d9afab6016fb3872c0ef6109e6ed49e39e04f Mon Sep 17 00:00:00 2001
From: Jason Lenz <Jason@Lenzplace.org>
Date: Fri, 19 Mar 2021 12:35:58 -0500
Subject: [PATCH 2/2] epkowa: apply recommendations from nixos package audit
 bot

---
 pkgs/misc/drivers/epkowa/default.nix | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/pkgs/misc/drivers/epkowa/default.nix b/pkgs/misc/drivers/epkowa/default.nix
index dc0fa8bf9cd..e027bd2e7f5 100644
--- a/pkgs/misc/drivers/epkowa/default.nix
+++ b/pkgs/misc/drivers/epkowa/default.nix
@@ -13,7 +13,6 @@
 , rpm
 , cpio
 , getopt
-, patchelf
 , autoPatchelfHook
 , gcc
 }:
@@ -324,17 +323,16 @@ stdenv.mkDerivation rec {
     sha256 = "1ma76jj0k3bz0fy06fiyl4di4y77rcryb0mwjmzs5ms2vq9rjysr";
   };
 
-  nativeBuildInputs = [ pkg-config ];
+  nativeBuildInputs = [ pkg-config libtool makeWrapper ];
   buildInputs = [
     gtk2
     libxml2
-    libtool
     libusb-compat-0_1
     sane-backends
-    makeWrapper
   ];
 
   patches = [
+    # Patch for compatibility with libpng versions greater than 10499
     (fetchpatch {
       urls = [
         "https://gitweb.gentoo.org/repo/gentoo.git/plain/media-gfx/iscan/files/iscan-2.28.1.3+libpng-1.5.patch?h=b6e4c805d53b49da79a0f64ef16bb82d6d800fcf"
@@ -342,7 +340,9 @@ stdenv.mkDerivation rec {
       ];
       sha256 = "04y70qjd220dpyh771fiq50lha16pms98mfigwjczdfmx6kpj1jd";
     })
+    # Patch iscan to search appropriate folders for firmware files
     ./firmware_location.patch
+    # Patch deprecated use of sscanf code to use a more modern C99 compatible version
     ./sscanf.patch
   ];
   patchFlags = [ "-p0" ];