- Implement debounce support.

- Clean up examples.
- Call deamon(3) after we open the PID file.

Submitted by:	 Mathew Kanner <mat@cnd.mcgill.ca>

2 files changed, 86 insertions, 31 deletions

diff --git a/usr.bin/usbhidaction/usbhidaction.1 b/usr.bin/usbhidaction/usbhidaction.1
index b0b491e..b83eb40 100644
--- a/usr.bin/usbhidaction/usbhidaction.1
+++ b/usr.bin/usbhidaction/usbhidaction.1
@@ -43,12 +43,10 @@
 .Nd perform actions according to USB HID controls
 .Sh SYNOPSIS
 .Nm
+.Op Fl diev
 .Fl c Ar config-file
-.Op Fl d
-.Op Fl i
 .Fl f Ar device
 .Op Fl p Ar pidfile
-.Op Fl v
 .Ar arg ...
 .Sh DESCRIPTION
 .Nm
@@ -60,12 +58,19 @@ die when the USB device is unplugged.
 .Pp
 The options are as follows:
 .Bl -tag -width Ds
-.It Fl c Ar config-file
-Specify a path name for the config file.
 .It Fl d
 Toggle the daemon flag.
+.It Fl e
+Instruct
+.Nm
+to die early.  Useful when specified with multiple
+verbose options to see how files are parsed.
 .It Fl i
 Ignore HID items in the config file that does not exist in the device.
+.It Fl v
+Be verbose, and do not become a daemon.
+.It Fl c Ar config-file
+Specify a path name for the config file.
 .It Fl f Ar device
 Specify a path name for the device to operate on.
 If
@@ -77,8 +82,6 @@ path, it is taken to be the name of the device under
 An absolute path is taken to be the literal device pathname.
 .It Fl p Ar pidfile
 Specify an alternate file in which to store the process ID.
-.It Fl v
-Be verbose, and do not become a daemon.
 .El
 .Pp
 The config file will be re-read if the process gets a HUP signal.
@@ -89,8 +92,8 @@ action; if a line begins with a whitespace it is considered a continuation
 of the previous line.
 Lines beginning with `#' are considered as comments.
 .Pp
-Each line has three parts: a name of a USB HID item, a value for that item,
-and an action.
+Each line has four parts: a name of a USB HID item, a value for that item,
+a debounce value, and an action.
 There must be whitespace between the parts.
 .Pp
 The item names are similar to those used by
@@ -102,6 +105,12 @@ When the item reports this value
 the action will be performed.
 If the value is `*' it will match any value.
 .Pp
+The debouce value is an integer not less than 0.  The value of 0
+indicates that no debouncing should occur. A value of 1 will only
+execute the action when the state changes. Values greater than one
+specify that an action should be performed only when the value
+changes by that amount.
+.Pp
 The action is a normal command that is executed with
 .Xr system 3 .
 Before it is executed some substitution will occur:
@@ -111,7 +120,7 @@ of the HID item, `$N' will be replaced by the name
 of the control, and `$H' will be replaced by the name
 of the HID device.
 .Sh FILES
-.Bl -tag -indent
+.Bl -tag -width indent
 .It Pa /usr/share/misc/usb_hid_usages
 The HID usage table.
 .It Pa /var/run/usbaction.pid
@@ -122,22 +131,26 @@ The following configuration file can be used to control a pair
 of Philips USB speakers with the HID controls on the speakers.
 .Bd -literal -offset indent
 # Configuration for various Philips USB speakers
-Consumer:Consumer_Control.Consumer:Volume_Up			   1
-	mixerctl -f $1 -n -w fea8-i7-master++
-Consumer:Consumer_Control.Consumer:Volume_Down			   1
-	mixerctl -f $1 -n -w fea8-i7-master--
-Consumer:Consumer_Control.Consumer:Mute				   1
-	mixerctl -f $1 -n -w fea8-i7-mute++
-Consumer:Consumer_Control.Consumer:Channel_Top.Microsoft:Base_Up   1
-	mixerctl -f $1 -n -w fea8-i7-bass++
-Consumer:Consumer_Control.Consumer:Channel_Top.Microsoft:Base_Down 1
-	mixerctl -f $1 -n -w fea8-i7-bass--
+Consumer:Volume_Up			 1 0 mixer -f $1 vol +1
+Consumer:Volume_Down			 1 0 mixer -f $1 vol -1
+# mute not supported
+#Consumer:Mute				 1 0 mixer -f $1 mute
+Consumer:Channel_Top.Microsoft:Base_Up	 1 0 mixer -f $1 bass +1
+Consumer:Channel_Top.Microsoft:Base_Down 1 0 mixer -f $1 bass -1
 .Ed
 .Pp
 A sample invocation using this configuration would be
 .Bd -literal -offset indent
 usbhidaction -f /dev/uhid1 -c conf /dev/mixer1
 .Ed
+.Pp
+The following example controls the mixer volume using a Logitech Wingman.  
+Notice the debouce of 1 for buttons and 5 for the slider.
+.Bd -literal -offset indent
+Button:Button_1	  1 1	mixer vol +10
+Button:Button_2	  1 1	mixer vol -10
+Generic_Desktop:Z * 5	mixer vol `echo $V | awk '{print int($$1/255*100)}'`
+.Ed
 .Sh SEE ALSO
 .Xr usbhidctl 1 ,
 .Xr usbhid 3 ,
diff --git a/usr.bin/usbhidaction/usbhidaction.c b/usr.bin/usbhidaction/usbhidaction.c
index 22868b1..b05de5b 100644
--- a/usr.bin/usbhidaction/usbhidaction.c
+++ b/usr.bin/usbhidaction/usbhidaction.c
@@ -66,6 +66,9 @@ struct command {
 
 	struct hid_item item;
 	int value;
+	int lastseen;
+	int lastused;
+	int debounce;
 	char anyvalue;
 	char *name;
 	char *action;
@@ -91,7 +94,7 @@ main(int argc, char **argv)
 	const char *conf = NULL;
 	const char *dev = NULL;
 	int fd, fp, ch, sz, n, val, i;
-	int demon, ignore;
+	int demon, ignore, dieearly;
 	report_desc_t repd;
 	char buf[100];
 	char devnamebuf[PATH_MAX];
@@ -100,7 +103,8 @@ main(int argc, char **argv)
 
 	demon = 1;
 	ignore = 0;
-	while ((ch = getopt(argc, argv, "c:df:ip:v")) != -1) {
+	dieearly = 0;
+	while ((ch = getopt(argc, argv, "c:def:ip:v")) != -1) {
 		switch(ch) {
 		case 'c':
 			conf = optarg;
@@ -108,6 +112,9 @@ main(int argc, char **argv)
 		case 'd':
 			demon ^= 1;
 			break;
+		case 'e':
+			dieearly = 1;
+			break;
 		case 'i':
 			ignore++;
 			break;
@@ -161,8 +168,6 @@ main(int argc, char **argv)
 	(void)signal(SIGHUP, sighup);
 
 	if (demon) {
-		if (daemon(0, 0) < 0)
-			err(1, "daemon()");
 		fp = open(pidfile, O_WRONLY|O_CREAT, S_IRUSR|S_IRGRP|S_IROTH);
 		if (fp >= 0) {
 			sz=snprintf(buf,100, "%d\n", getpid());
@@ -170,6 +175,8 @@ main(int argc, char **argv)
 			close(fp);
 		} else
 			err(1, "%s", pidfile);
+		if (daemon(0, 0) < 0)
+			err(1, "daemon()");
 		isdemon = 1;
 	}
 
@@ -194,9 +201,28 @@ main(int argc, char **argv)
 #endif
 		for (cmd = commands; cmd; cmd = cmd->next) {
 			val = hid_get_data(buf, &cmd->item);
-			if (cmd->value == val || cmd->anyvalue)
+			if (cmd->value != val && cmd->anyvalue == 0)
+				goto next;
+			if ((cmd->debounce == 0) ||
+			    (cmd->debounce && ((cmd->lastseen == -1) ||
+					       (cmd->lastseen != val)))) {
 				docmd(cmd, val, dev, argc, argv);
+				goto next;
+			}
+			if ((cmd->debounce > 1) &&
+			    ((cmd->lastused == -1) ||
+			     (abs(cmd->lastused - val) >= cmd->debounce))) {
+				docmd(cmd, val, dev, argc, argv);
+				cmd->lastused = val;
+				goto next;
+			}
+next:
+			cmd->lastseen = val;
 		}
+
+		if (dieearly)
+			exit(0);
+
 		if (reparse) {
 			struct command *cmds =
 			    parse_conf(conf, repd, reportid, ignore);
@@ -215,8 +241,8 @@ void
 usage(void)
 {
 
-	fprintf(stderr, "Usage: %s -c config_file [-d] -f hid_dev "
-		"[-i] [-p pidfile] [-v]\n", getprogname());
+	fprintf(stderr, "Usage: %s [-deiv] -c config_file -f hid_dev "
+		"[-p pidfile]\n", getprogname());
 	exit(1);
 }
 
@@ -237,7 +263,7 @@ parse_conf(const char *conf, report_desc_t repd, int reportid, int ignore)
 	FILE *f;
 	char *p;
 	int line;
-	char buf[SIZE], name[SIZE], value[SIZE], action[SIZE];
+	char buf[SIZE], name[SIZE], value[SIZE], debounce[SIZE], action[SIZE];
 	char usage[SIZE], coll[SIZE];
 	struct command *cmd, *cmds;
 	struct hid_data *d;
@@ -263,7 +289,8 @@ parse_conf(const char *conf, report_desc_t repd, int reportid, int ignore)
 		}
 		if (p)
 			*p = 0;
-		if (sscanf(buf, "%s %s %[^\n]", name, value, action) != 3) {
+		if (sscanf(buf, "%s %s %s %[^\n]",
+			   name, value, debounce, action) != 4) {
 			if (isdemon) {
 				syslog(LOG_WARNING, "config file `%s', line %d"
 				       ", syntax error: %s", conf, line, buf);
@@ -290,18 +317,33 @@ parse_conf(const char *conf, report_desc_t repd, int reportid, int ignore)
 				if (isdemon) {
 					syslog(LOG_WARNING,
 					       "config file `%s', line %d, "
-					       "bad value: %s\n",
+					       "bad value: %s (should be * or a number)\n",
 					       conf, line, value);
 					freecommands(cmds);
 					return (NULL);
 				} else {
 					errx(1, "config file `%s', line %d, "
-					     "bad value: %s\n",
+					     "bad value: %s (should be * or a number)\n",
 					     conf, line, value);
 				}
 			}
 		}
 
+		if (sscanf(debounce, "%d", &cmd->debounce) != 1) {
+			if (isdemon) {
+				syslog(LOG_WARNING,
+				       "config file `%s', line %d, "
+				       "bad value: %s (should be a number >= 0)\n",
+				       conf, line, debounce);
+				freecommands(cmds);
+				return (NULL);
+			} else {
+				errx(1, "config file `%s', line %d, "
+				     "bad value: %s (should be a number >= 0)\n",
+				     conf, line, debounce);
+			}
+		}
+
 		coll[0] = 0;
 		for (d = hid_start_parse(repd, 1 << hid_input, reportid);
 		     hid_get_item(d, &h); ) {