From: Antonio Ospite <ospite@studenti.unina.it>
Date: Fri, 7 Dec 2012 10:51:16 +0000 (+0100)
Subject: am7xxx: cache device info in am7xxx_get_device_info()
X-Git-Tag: v0.1.3~6^2~1
X-Git-Url: https://git.ao2.it/libam7xxx.git/commitdiff_plain/55ed26c219ebf43143f7d2554aed884535866f91?ds=inline;hp=55ed26c219ebf43143f7d2554aed884535866f91

am7xxx: cache device info in am7xxx_get_device_info()

Request the actual device info from the device only when there is not
a cached version of it already.

This serves two purposes:

  1. Cover the case when some firmwares provide useful device info
     only under some conditions and spit out bogus data instead when
     these conditions are not met.

  2. Speed up am7xxx_get_device_info() as the USB communication is
     performed only once. AFAWN the device info does not change
     throughout the life of an am7xxx_device.
---