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ptp: Added a brand new class driver for ptp clocks.

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This patch adds an infrastructure for hardware clocks that implement
IEEE 1588, the Precision Time Protocol (PTP). A class driver offers a
registration method to particular hardware clock drivers. Each clock is
presented as a standard POSIX clock.

The ancillary clock features are exposed in two different ways, via
the sysfs and by a character device.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Richard Cochran
2011-04-22 12:03:08 +02:00
committed by John Stultz
parent caebc160ce
commit d94ba80ebb
16 changed files with 1695 additions and 0 deletions
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7
include/linux/ptp_classify.h
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@@ -25,6 +25,7 @@
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/filter.h>
#ifdef __KERNEL__
#include <linux/in.h>
@@ -58,6 +59,12 @@
#define OFF_NEXT 6
#define OFF_UDP_DST 2
#define OFF_PTP_SOURCE_UUID 22 /* PTPv1 only */
#define OFF_PTP_SEQUENCE_ID 30
#define OFF_PTP_CONTROL 32 /* PTPv1 only */
#define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2)
#define IP6_HLEN 40
#define UDP_HLEN 8