* Document ztdummy changes.

* It's a (ztdummy) clock source, not ztdummy type.


git-svn-id: http://svn.digium.com/svn/zaptel/branches/1.4@3044 5390a7c7-147a-4af0-8ec9-7488f05a26cb

2 files changed, 16 insertions, 7 deletions

diff --git a/README b/README
index dfff136..b33f7c1 100644
--- a/README
+++ b/README
@@ -97,8 +97,11 @@ If you build a custom kernel, note the following configuration items:
   be selected These can be selected from the "Library Routines" submenu 
   during kernel configuration via "make menuconfig".
 - If you don't have any zaptel hardware, you need ztdummy.
-  * ztdummy on i386/amd64 and later kernels (>= 2.6.15) can (and should)
-    use the system's RTC (Real Time Clock).
+  * ztdummy on i386/x86_64 with kernels >= 2.6.22 can (and should) use 
+    high resolution times (CONFIG_HIGH_RES_TIMERS), and (if available, 
+    the system HPET.
+  * ztdummy on i386/x86_64 and later kernels (>= 2.6.15) can use the 
+    system's RTC (Real Time Clock).
   * Alternatives to that for ztdummy are a UHCI USB controller (USB
     controllers made by Intel or VIA) or a kernel that has HZ=1000
     (default on kernels 2.6.0-2.6.12, optional on newer kernels. Not
@@ -333,6 +336,12 @@ first cycle. Eitherwise it will just give you in each cycle the percent
 of how close it was. Also try running it with the option -v for a
 verbose output.
 
+To check the clock source that is built into ztdummy, you can either
+look at title of its span in /proc/zaptel file for a "source:" in the
+description. Or even run:
+
+  strings zaptel.ko | grep source:
+
 
 Spans and Channels
 ------------------
diff --git a/ztdummy.c b/ztdummy.c
index d83bd1f..1fce4d7 100644
--- a/ztdummy.c
+++ b/ztdummy.c
@@ -102,17 +102,17 @@ static int debug = 0;
 
 #ifdef LINUX26
 #ifdef USE_HIGHRESTIMER
-#define ZTDUMMY_TYPE "HRtimer"
+#define CLOCK_SRC "HRtimer"
 struct hrtimer zaptimer;
 #elif defined(USE_RTC)
-#define ZTDUMMY_TYPE "RTC"
+#define CLOCK_SRC "RTC"
 static int rtc_rate = 0;
 static int current_rate = 0;
 static int taskletpending = 0;
 static struct tasklet_struct ztd_tlet;
 static void ztd_tasklet(unsigned long data);
 #else /* Linux 2.6, but no RTC or HRTIMER used */
-#define ZTDUMMY_TYPE "Linux26"
+#define CLOCK_SRC "Linux26"
 /* 2.6 kernel timer stuff */
 static struct timer_list timer;
 #endif
@@ -120,7 +120,7 @@ static struct timer_list timer;
 #if LINUX_VERSION_CODE < VERSION_CODE(2,4,5)
 #  error "This kernel is too old: not supported by this file"
 #endif
-#define ZTDUMMY_TYPE "UHCI"
+#define CLOCK_SRC "UHCI"
 /* Old UCHI stuff */
 static    uhci_desc_t  *td;
 static    uhci_t *s;
@@ -262,7 +262,7 @@ static int ztdummy_initialize(struct ztdummy *ztd)
 {
 	/* Zapata stuff */
 	sprintf(ztd->span.name, "ZTDUMMY/1");
-	sprintf(ztd->span.desc, "%s (type: " ZTDUMMY_TYPE ") %d", ztd->span.name, 1);
+	sprintf(ztd->span.desc, "%s (source: " CLOCK_SRC ") %d", ztd->span.name, 1);
 	sprintf(ztd->chan.name, "ZTDUMMY/%d/%d", 1, 0);
 	ztd->chan.chanpos = 1;
 	ztd->span.chans = &ztd->chan;