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authorStefan Richter <stefanr@s5r6.in-berlin.de>2010-02-20 14:13:49 +0300
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-02-24 22:36:54 +0300
commitabfe5a01ef1e463cbafdae461b693db34e308c02 (patch)
treee33056c7d8b80a3128f7714c31b083091be3ea9b /include
parentfd6e0c518121d22b50060d26c8aec2b701c6aab7 (diff)
downloadlinux-abfe5a01ef1e463cbafdae461b693db34e308c02.tar.xz
firewire: cdev: add more flexible cycle timer ioctl
The system time from CLOCK_REALTIME is not monotonic, hence problematic for the main user of the FW_CDEV_IOC_GET_CYCLE_TIMER ioctl. This issue exists in its successor ABI, i.e. raw1394, too. http://subversion.ffado.org/ticket/242 We now offer an alternative ioctl which lets the caller choose between CLOCK_REALTIME, CLOCK_MONOTONIC, and CLOCK_MONOTONIC_RAW as source of the local time, very similar to the clock_gettime libc function. The format of the local time return value matches that of clock_gettime (seconds and nanoseconds, instead of a single microseconds value from the existing ioctl). Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/firewire-cdev.h31
1 files changed, 27 insertions, 4 deletions
diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index 520ecf86cbb3..baa8290c8416 100644
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -248,6 +248,9 @@ union fw_cdev_event {
#define FW_CDEV_IOC_SEND_BROADCAST_REQUEST _IOW('#', 0x12, struct fw_cdev_send_request)
#define FW_CDEV_IOC_SEND_STREAM_PACKET _IOW('#', 0x13, struct fw_cdev_send_stream_packet)
+/* available since kernel version 2.6.34 */
+#define FW_CDEV_IOC_GET_CYCLE_TIMER2 _IOWR('#', 0x14, struct fw_cdev_get_cycle_timer2)
+
/*
* FW_CDEV_VERSION History
* 1 (2.6.22) - initial version
@@ -544,14 +547,15 @@ struct fw_cdev_stop_iso {
/**
* struct fw_cdev_get_cycle_timer - read cycle timer register
* @local_time: system time, in microseconds since the Epoch
- * @cycle_timer: isochronous cycle timer, as per OHCI 1.1 clause 5.13
+ * @cycle_timer: Cycle Time register contents
*
* The %FW_CDEV_IOC_GET_CYCLE_TIMER ioctl reads the isochronous cycle timer
- * and also the system clock. This allows to express the receive time of an
- * isochronous packet as a system time with microsecond accuracy.
+ * and also the system clock (%CLOCK_REALTIME). This allows to express the
+ * receive time of an isochronous packet as a system time.
*
* @cycle_timer consists of 7 bits cycleSeconds, 13 bits cycleCount, and
- * 12 bits cycleOffset, in host byte order.
+ * 12 bits cycleOffset, in host byte order. Cf. the Cycle Time register
+ * per IEEE 1394 or Isochronous Cycle Timer register per OHCI-1394.
*/
struct fw_cdev_get_cycle_timer {
__u64 local_time;
@@ -559,6 +563,25 @@ struct fw_cdev_get_cycle_timer {
};
/**
+ * struct fw_cdev_get_cycle_timer2 - read cycle timer register
+ * @tv_sec: system time, seconds
+ * @tv_nsec: system time, sub-seconds part in nanoseconds
+ * @clk_id: input parameter, clock from which to get the system time
+ * @cycle_timer: Cycle Time register contents
+ *
+ * The %FW_CDEV_IOC_GET_CYCLE_TIMER2 works like
+ * %FW_CDEV_IOC_GET_CYCLE_TIMER but lets you choose a clock like with POSIX'
+ * clock_gettime function. Supported @clk_id values are POSIX' %CLOCK_REALTIME
+ * and %CLOCK_MONOTONIC and Linux' %CLOCK_MONOTONIC_RAW.
+ */
+struct fw_cdev_get_cycle_timer2 {
+ __s64 tv_sec;
+ __s32 tv_nsec;
+ __s32 clk_id;
+ __u32 cycle_timer;
+};
+
+/**
* struct fw_cdev_allocate_iso_resource - (De)allocate a channel or bandwidth
* @closure: Passed back to userspace in correponding iso resource events
* @channels: Isochronous channels of which one is to be (de)allocated