From: Clemens Ladisch <clemens@ladisch.de>
To: Takashi Sakamoto <o-takashi@sakamocchi.jp>, Takashi Iwai <tiwai@suse.de>
Cc: alsa-devel@alsa-project.org,
Stefan Richter <stefanr@s5r6.in-berlin.de>,
kbuild test robot <lkp@intel.com>,
ffado-devel@lists.sf.net, kbuild-all@01.org
Subject: Re: [PATCH 1/7] ALSA: firewire-tascam: add skeleton for TASCAM FireWire series
Date: Sat, 3 Oct 2015 11:14:22 +0200 [thread overview]
Message-ID: <560F9C6E.70800@ladisch.de> (raw)
In-Reply-To: <560F3EB0.7020508@sakamocchi.jp>
Takashi Sakamoto wrote:
>>>> 23 data = be32_to_cpu(fw_dev->config_rom[28]);
>
> About using 'be32_to_cpu()', the 'config_rom' member actually has 'const
> u32 *', while in the member caracters in the textual leaf are aligned in
> big-endian.
Strictly speaking, strings do not have an endianness.
Most data in the actual configuration ROM is organized as big-endian 32-
bit values, so the FireWire core converts _all_ words from big endian to
CPU endian. The words that are not actually 32-bit values but strings
have to be converted back; the correct function for this is cpu_to_be32().
Regards,
Clemens
next prev parent reply other threads:[~2015-10-03 9:15 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-01 13:02 [PATCH 0/7 v3] firewire-tascam: new driver for TASCAM FireWire series Takashi Sakamoto
2015-10-01 13:02 ` [PATCH 1/7] ALSA: firewire-tascam: add skeleton " Takashi Sakamoto
2015-10-01 13:54 ` kbuild test robot
2015-10-02 16:24 ` Takashi Iwai
2015-10-02 18:47 ` Clemens Ladisch
2015-10-03 2:34 ` Takashi Sakamoto
2015-10-03 8:51 ` Takashi Iwai
2015-10-03 10:33 ` Stefan Richter
2015-10-03 9:14 ` Clemens Ladisch [this message]
2015-10-03 9:57 ` Takashi Sakamoto
2015-10-03 10:54 ` Stefan Richter
2015-10-04 11:54 ` Takashi Sakamoto
2015-10-03 16:07 ` Takashi Iwai
2015-10-03 23:33 ` Takashi Sakamoto
2015-10-01 13:02 ` [PATCH 2/7] ALSA: firewire-tascam: add a structure for model-dependent parameters Takashi Sakamoto
2015-10-01 13:02 ` [PATCH 3/7] ALSA: firewire-tascam: add proc node to show firmware information Takashi Sakamoto
2015-10-01 13:02 ` [PATCH 4/7] ALSA: firewire-tascam: add data block processing layer Takashi Sakamoto
2015-10-01 13:02 ` [PATCH 5/7] ALSA: firewire-tascam: add streaming functionality Takashi Sakamoto
2015-10-01 13:02 ` [PATCH 6/7] ALSA: firewire-tascam: add PCM functionality Takashi Sakamoto
2015-10-01 13:02 ` [PATCH 7/7] ALSA: firewire-tascam: add hwdep interface Takashi Sakamoto
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