From 08f6df7b48515dbb21b21ee571b6466daddeec57 Mon Sep 17 00:00:00 2001
From: Julien BLACHE <jb@jblache.org>
Date: Sun, 29 Jul 2007 18:39:54 +0000
Subject: [PATCH] Add a RUN rule to the udev rules to automatically disable USB
 suspend for all known scanners. This effectively works around the hardware
 bugs exposed by CONFIG_USB_SUSPEND.

Works only with kernels >= 2.6.22 where /sys/bus/usb/devices/*/power/level exists.
---
 ChangeLog         | 6 ++++++
 tools/sane-desc.c | 6 +++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 9b6eda7c7..5e685f95f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2007-07-29 Julien Blache <jb@jblache.org>
+	* tools/sane-desc.c: Add a RUN rule to the udev rules to
+	automatically disable USB suspend for all known scanners.
+	Works only with kernels >= 2.6.22 where
+	/sys/bus/usb/devices/*/power/level exists.
+
 2007-07-26  m. allan noah <kitno455 a t gmail d o t com>
 
 	* backend/fujitsu.c: update to version 1.0.51, fix bug in jpeg code
diff --git a/tools/sane-desc.c b/tools/sane-desc.c
index a5f2b5b93..5d03dae0b 100644
--- a/tools/sane-desc.c
+++ b/tools/sane-desc.c
@@ -3226,10 +3226,14 @@ print_udev (void)
 	    }
 	}
       printf ("\n");
-      printf ("SYSFS{idVendor}==\"%s\", SYSFS{idProduct}==\"%s\", MODE=\"0664\", GROUP=\"scanner\"\n",
+      printf ("SYSFS{idVendor}==\"%s\", SYSFS{idProduct}==\"%s\", MODE=\"0664\", GROUP=\"scanner\", ENV{libsane_matched}=\"yes\"\n",
 	      usbid->usb_vendor_id + 2,  usbid->usb_product_id + 2);
       usbid = usbid->next;
     }
+
+  printf("\n# The following rule will disable USB autosuspend for the device\n");
+  printf("ENV{libsane_matched}==\"yes\", RUN+=\"/bin/sh -c 'test -e /sys/$env{DEVPATH}/power/level && echo on > /sys/$env{DEVPATH}/power/level'\"\n");
+
   printf ("\nLABEL=\"libsane_rules_end\"\n");
 }