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

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>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/ptp_classify.h b/include/linux/ptp_classify.h
index 943a85ab002..e07e2742a86 100644
--- a/include/linux/ptp_classify.h
+++ b/include/linux/ptp_classify.h
@@ -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