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authorStefan Richter <stefanr@s5r6.in-berlin.de>2010-02-21 12:48:57 +0100
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-02-24 20:36:55 +0100
commite94b6d7736107c07b1b089797651d02994d268c7 (patch)
treef023111bfc0f65b9d8382b9bf5e6c4b5d3a427f3 /include/linux/firewire-cdev.h
parentabfe5a01ef1e463cbafdae461b693db34e308c02 (diff)
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firewire: cdev: increment ABI version number
so that clients can detect whether the FW_CDEV_IOC_GET_CYCLE_TIMER ioctl is reliable (on all tested controllers, especially the widely used VIA controllers, also NEC controllers, see commits b677532b and 1c1517ef). Also add a comment on the 2.6.32 iso xmit enhancement and on dual-buffer IR having been disabled in 2.6.33. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'include/linux/firewire-cdev.h')
-rw-r--r--include/linux/firewire-cdev.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index baa8290c8416..40b11013408e 100644
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -256,8 +256,12 @@ union fw_cdev_event {
* 1 (2.6.22) - initial version
* 2 (2.6.30) - changed &fw_cdev_event_iso_interrupt.header if
* &fw_cdev_create_iso_context.header_size is 8 or more
+ * (2.6.32) - added time stamp to xmit &fw_cdev_event_iso_interrupt
+ * (2.6.33) - IR has always packet-per-buffer semantics now, not one of
+ * dual-buffer or packet-per-buffer depending on hardware
+ * 3 (2.6.34) - made &fw_cdev_get_cycle_timer reliable
*/
-#define FW_CDEV_VERSION 2
+#define FW_CDEV_VERSION 3
/**
* struct fw_cdev_get_info - General purpose information ioctl
@@ -556,6 +560,9 @@ struct fw_cdev_stop_iso {
* @cycle_timer consists of 7 bits cycleSeconds, 13 bits cycleCount, and
* 12 bits cycleOffset, in host byte order. Cf. the Cycle Time register
* per IEEE 1394 or Isochronous Cycle Timer register per OHCI-1394.
+ *
+ * In version 1 and 2 of the ABI, this ioctl returned unreliable (non-
+ * monotonic) @cycle_timer values on certain controllers.
*/
struct fw_cdev_get_cycle_timer {
__u64 local_time;