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authorStefan Richter <stefanr@s5r6.in-berlin.de>2010-10-10 00:12:20 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-10-11 14:48:03 +0200
commit66fa12c571d35e3cd62574c65f1785a460105397 (patch)
treeb4f8de3d5ca827d2b134ed628628a7bff46967ca /Documentation/ABI/removed
parent1ef5b816c0eaf84f91106cfc0893069c49e86113 (diff)
downloadlinux-66fa12c571d35e3cd62574c65f1785a460105397.tar.gz
ieee1394: remove the old IEEE 1394 driver stack
The drivers - ohci1394 (controller driver) - ieee1394 (core) - dv1394, raw1394, video1394 (userspace ABI) - eth1394, sbp2 (protocol drivers) are replaced by - firewire-ohci (controller driver) - firewire-core (core and userspace ABI) - firewire-net, firewire-sbp2 (protocol drivers) which are more featureful, better performing, and more secure than the older drivers; all with a smaller and more modern code base. The driver firedtv in drivers/media/dvb/firewire/ contains backends to both ieee1394 and firewire-core. Its ieee1394 backend code can be removed in an independent commit; firedtv as-is builds and works fine without ieee1394. The driver pcilynx (an incomplete controller driver) is deleted without replacement since PCILynx cards are extremely rare. Owners of these cards use them with the stand-alone bus sniffer driver nosy instead. The drivers nosy and init_ohci1394_dma which do not interact with either of the two IEEE 1394 stacks are not affected by the ieee1394 subsystem removal. There are still some issues with the newer firewire subsystem compared to the older one: - The rare and quirky controllers ALi M52xx, Apple UniNorth v1, NVIDIA NForce2 are even less well supported by firewire-ohci than by ohci1394. I am looking into the M52xx issue. - The experimental firewire-net is reportedly less stable than its experimental cousin eth1394. - Audio playback of a certain group of audio devices (ones based on DICE chipset with EAP; supported by prerelease FFADO code) does not work yet. This issue is still under investigation. - There were some ieee1394 based out-of-the-mainline drivers. Of them, only lisight, an audio driver for iSight webcams, seems still useful. Work is underway to reimplement it on top of firewire-core. All these remainig issues are minor; they should not stand in the way of overall better user experience of IEEE 1394 on Linux, together with a reduction in support efforts and maintenance burden. The coexistence of two IEEE 1394 kernel driver stacks in the mainline since 2.6.22 shall end now, as announced earlier this year. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'Documentation/ABI/removed')
-rw-r--r--Documentation/ABI/removed/dv139414
-rw-r--r--Documentation/ABI/removed/raw139415
-rw-r--r--Documentation/ABI/removed/raw1394_legacy_isochronous16
-rw-r--r--Documentation/ABI/removed/video139416
4 files changed, 45 insertions, 16 deletions
diff --git a/Documentation/ABI/removed/dv1394 b/Documentation/ABI/removed/dv1394
new file mode 100644
index 00000000000..c2310b6676f
--- /dev/null
+++ b/Documentation/ABI/removed/dv1394
@@ -0,0 +1,14 @@
+What: dv1394 (a.k.a. "OHCI-DV I/O support" for FireWire)
+Date: May 2010 (scheduled), finally removed in kernel v2.6.37
+Contact: linux1394-devel@lists.sourceforge.net
+Description:
+ /dev/dv1394/* were character device files, one for each FireWire
+ controller and for NTSC and PAL respectively, from which DV data
+ could be received by read() or transmitted by write(). A few
+ ioctl()s allowed limited control.
+ This special-purpose interface has been superseded by libraw1394 +
+ libiec61883 which are functionally equivalent, support HDV, and
+ transparently work on top of the newer firewire kernel drivers.
+
+Users:
+ ffmpeg/libavformat (if configured for DV1394)
diff --git a/Documentation/ABI/removed/raw1394 b/Documentation/ABI/removed/raw1394
new file mode 100644
index 00000000000..490aa1efc4a
--- /dev/null
+++ b/Documentation/ABI/removed/raw1394
@@ -0,0 +1,15 @@
+What: raw1394 (a.k.a. "Raw IEEE1394 I/O support" for FireWire)
+Date: May 2010 (scheduled), finally removed in kernel v2.6.37
+Contact: linux1394-devel@lists.sourceforge.net
+Description:
+ /dev/raw1394 was a character device file that allowed low-level
+ access to FireWire buses. Its major drawbacks were its inability
+ to implement sensible device security policies, and its low level
+ of abstraction that required userspace clients do duplicate much
+ of the kernel's ieee1394 core functionality.
+ Replaced by /dev/fw*, i.e. the <linux/firewire-cdev.h> ABI of
+ firewire-core.
+
+Users:
+ libraw1394 (works with firewire-cdev too, transparent to library ABI
+ users)
diff --git a/Documentation/ABI/removed/raw1394_legacy_isochronous b/Documentation/ABI/removed/raw1394_legacy_isochronous
deleted file mode 100644
index 1b629622d88..00000000000
--- a/Documentation/ABI/removed/raw1394_legacy_isochronous
+++ /dev/null
@@ -1,16 +0,0 @@
-What: legacy isochronous ABI of raw1394 (1st generation iso ABI)
-Date: June 2007 (scheduled), removed in kernel v2.6.23
-Contact: linux1394-devel@lists.sourceforge.net
-Description:
- The two request types RAW1394_REQ_ISO_SEND, RAW1394_REQ_ISO_LISTEN have
- been deprecated for quite some time. They are very inefficient as they
- come with high interrupt load and several layers of callbacks for each
- packet. Because of these deficiencies, the video1394 and dv1394 drivers
- and the 3rd-generation isochronous ABI in raw1394 (rawiso) were created.
-
-Users:
- libraw1394 users via the long deprecated API raw1394_iso_write,
- raw1394_start_iso_write, raw1394_start_iso_rcv, raw1394_stop_iso_rcv
-
- libdc1394, which optionally uses these old libraw1394 calls
- alternatively to the more efficient video1394 ABI
diff --git a/Documentation/ABI/removed/video1394 b/Documentation/ABI/removed/video1394
new file mode 100644
index 00000000000..c39c25aee77
--- /dev/null
+++ b/Documentation/ABI/removed/video1394
@@ -0,0 +1,16 @@
+What: video1394 (a.k.a. "OHCI-1394 Video support" for FireWire)
+Date: May 2010 (scheduled), finally removed in kernel v2.6.37
+Contact: linux1394-devel@lists.sourceforge.net
+Description:
+ /dev/video1394/* were character device files, one for each FireWire
+ controller, which were used for isochronous I/O. It was added as an
+ alternative to raw1394's isochronous I/O functionality which had
+ performance issues in its first generation. Any video1394 user had
+ to use raw1394 + libraw1394 too because video1394 did not provide
+ asynchronous I/O for device discovery and configuration.
+ Replaced by /dev/fw*, i.e. the <linux/firewire-cdev.h> ABI of
+ firewire-core.
+
+Users:
+ libdc1394 (works with firewire-cdev too, transparent to library ABI
+ users)