wcte12xp: Fix pulse digit detection when set for FXO signalling modes.

The frequency that the RBS registers were polled was too slow to catch the pulse
dialing digits. The result was that often times dahdi would generate WINK events
instead of PULSEDIGIT events.

This speeds up the rate at which the registers are checked from 100ms to 33ms
and also makes the process of checking the registers quicker by queing up all
the reads at once.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>

Origin: http://svnview.digium.com/svn/dahdi?view=rev&rev=10699

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/branches/2.6@10706 a0bf4364-ded3-4de4-8d8a-66a801d63aff

1 files changed, 84 insertions, 20 deletions

diff --git a/drivers/dahdi/wcte12xp/base.c b/drivers/dahdi/wcte12xp/base.c
index eef229a..f0fa949 100644
--- a/drivers/dahdi/wcte12xp/base.c
+++ b/drivers/dahdi/wcte12xp/base.c
@@ -643,21 +643,21 @@ static inline int t1_setreg(struct t1 *wc, int addr, int val)
 	return 0;
 }
 
-static int t1_getreg(struct t1 *wc, int addr)
+static void __t1_getreg(struct t1 *wc, int addr, struct command *cmd)
 {
-	struct command *cmd =  NULL;
-	unsigned long ret;
-	unsigned long flags;
-
-	might_sleep();
-
-	cmd = get_free_cmd(wc);
-	if (!cmd)
-		return -ENOMEM;
 	cmd->address = addr;
 	cmd->data = 0x00;
 	cmd->flags = __CMD_RD;
 	submit_cmd(wc, cmd);
+}
+
+static int __t1_getresult(struct t1 *wc, struct command *cmd)
+{
+	int ret;
+	unsigned long flags;
+
+	might_sleep();
+
 	ret = wait_for_completion_interruptible_timeout(&cmd->complete, HZ*10);
 	if (unlikely(!ret)) {
 		spin_lock_irqsave(&wc->reglock, flags);
@@ -692,6 +692,16 @@ static int t1_getreg(struct t1 *wc, int addr)
 	return ret;
 }
 
+static int t1_getreg(struct t1 *wc, int addr)
+{
+	struct command *cmd =  NULL;
+	cmd = get_free_cmd(wc);
+	if (!cmd)
+		return -ENOMEM;
+	__t1_getreg(wc, addr, cmd);
+	return __t1_getresult(wc, cmd);
+}
+
 static void t1_setleds(struct t1 *wc, int leds)
 {
 	struct command *cmd;
@@ -1183,15 +1193,29 @@ static int t1xxp_rbsbits(struct dahdi_chan *chan, int bits)
 	return 0;
 }
 
-static inline void t1_check_sigbits(struct t1 *wc)
+static void t1_check_sigbits(struct t1 *wc)
 {
+	struct command *cmds[15] = {NULL,};
 	int a,i,rxs;
 
 	if (!(test_bit(DAHDI_FLAGBIT_RUNNING, &wc->span.flags)))
 		return;
 	if (dahdi_is_e1_span(&wc->span)) {
+		/* Send out all the commands first. */
 		for (i = 0; i < 15; i++) {
-			a = t1_getreg(wc, 0x71 + i);
+			if (!(wc->span.chans[i+16]->sig & DAHDI_SIG_CLEAR) ||
+			    !(wc->span.chans[i]->sig & DAHDI_SIG_CLEAR))  {
+				cmds[i] = get_free_cmd(wc);
+				__t1_getreg(wc, 0x71 + i, cmds[i]);
+			}
+		}
+
+		/* Now check the results */
+		for (i = 14; i >= 0; --i) {
+			struct command *cmd = cmds[i];
+			if (!cmd)
+				continue;
+			a = __t1_getresult(wc, cmd);
 			if (a > -1) {
 				/* Get high channel in low bits */
 				rxs = (a & 0xf);
@@ -1209,8 +1233,19 @@ static inline void t1_check_sigbits(struct t1 *wc)
 			}
 		}
 	} else if (wc->span.lineconfig & DAHDI_CONFIG_D4) {
+		/* First we'll send out the commands */
 		for (i = 0; i < 24; i+=4) {
-			a = t1_getreg(wc, 0x70 + (i>>2));
+			cmds[i] = get_free_cmd(wc);
+			if (!cmds[i]) {
+				WARN_ON(1);
+				return;
+			}
+			__t1_getreg(wc, 0x70 + (i>>2), cmds[i]);
+		}
+
+		/* Now we'll check the results */
+		for (i = 20; i >= 0; i -= 4) {
+			a = __t1_getresult(wc, cmds[i]);
 			if (a > -1) {
 				/* Get high channel in low bits */
 				rxs = (a & 0x3) << 2;
@@ -1240,8 +1275,18 @@ static inline void t1_check_sigbits(struct t1 *wc)
 			}
 		}
 	} else {
+		/* First send out the commands. */
 		for (i = 0; i < 24; i+=2) {
-			a = t1_getreg(wc, 0x70 + (i>>1));
+			cmds[i] = get_free_cmd(wc);
+			if (!cmds[i]) {
+				WARN_ON(1);
+				return;
+			}
+			__t1_getreg(wc, 0x70 + (i>>1), cmds[i]);
+		}
+		/* Now check the results. */
+		for (i = 22; i >= 0; i -= 2) {
+			a = __t1_getresult(wc, cmds[i]);
 			if (a > -1) {
 				/* Get high channel in low bits */
 				rxs = (a & 0xf);
@@ -2036,19 +2081,38 @@ static int t1_hardware_post_init(struct t1 *wc, enum linemode *type)
 	return 0;
 }
 
-static inline void t1_check_alarms(struct t1 *wc)
+static void t1_check_alarms(struct t1 *wc)
 {
 	unsigned char c,d;
 	int alarms;
 	int x,j;
 	unsigned char fmr4; /* must read this always */
+	struct command *cmds[3];
 
 	if (!(test_bit(DAHDI_FLAGBIT_RUNNING, &wc->span.flags)))
 		return;
 
-	c = t1_getreg(wc, 0x4c);
-	fmr4 = t1_getreg(wc, 0x20); /* must read this even if we don't use it */
-	d = t1_getreg(wc, 0x4d);
+	for (x = 0; x < ARRAY_SIZE(cmds); ++x) {
+		cmds[x] = get_free_cmd(wc);
+		if (!cmds[x]) {
+			WARN_ON(1);
+			for (x = 0; x < ARRAY_SIZE(cmds); ++x)
+				free_cmd(wc, cmds[x]);
+			return;
+		}
+	}
+
+	/* Since this is voicebus, if we issue all the reads initially and then
+	 * check the results we can save ourselves some time. Otherwise, each
+	 * read will take a minimum of 3ms to go through the complete pipeline.
+	 */
+	__t1_getreg(wc, 0x4c, cmds[0]);
+	__t1_getreg(wc, 0x20, cmds[1]); /* must read this even if not used */
+	__t1_getreg(wc, 0x4d, cmds[2]);
+
+	d = __t1_getresult(wc, cmds[2]);
+	fmr4 = __t1_getresult(wc, cmds[1]);
+	c = __t1_getresult(wc, cmds[0]);
 
 	/* Assume no alarms */
 	alarms = 0;
@@ -2464,11 +2528,11 @@ static void timer_work_func(struct work_struct *work)
 {
 	struct t1 *wc = container_of(work, struct t1, timer_work);
 #endif
+	if (test_bit(INITIALIZED, &wc->bit_flags))
+		mod_timer(&wc->timer, jiffies + HZ/30);
 	t1_do_counters(wc);
 	t1_check_alarms(wc);
 	t1_check_sigbits(wc);
-	if (test_bit(INITIALIZED, &wc->bit_flags))
-		mod_timer(&wc->timer, jiffies + HZ/10);
 }
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)