Second stage of hotplug transition to 2.6 interface.

1 files changed, 97 insertions, 0 deletions

diff --git a/gpsd.hotplug b/gpsd.hotplug
new file mode 100755
index 00000000..c1be0676
--- /dev/null
+++ b/gpsd.hotplug
@@ -0,0 +1,97 @@
+#!/usr/bin/env python
+#
+# gpsd.hotplug -- hotplug script for gpsd
+#
+# This script will tell a running gpsd that it should look at the
+# device that just went active, because it might be a GPS.
+#
+# This script is part of the gpsd distrbution: see http://gpsd.berlios.de
+# Written by Eric S. Raymond, March 2005.
+import os, syslog, glob, socket
+
+def gpsd_connect():
+    "Acquire a connection to the GPSD port."
+    msg = "getaddrinfo returns an empty list"
+    sock = None
+    sockfile = None
+    for res in socket.getaddrinfo("localhost", 2947, 0, socket.SOCK_STREAM):
+        (af, socktype, proto, canonname, sa) = res
+        try:
+            sock = socket.socket(af, socktype, proto)
+            sock.connect(sa)
+            sockfile = sock.makefile()
+        except socket.error, msg:
+            if sock:
+                sock.close()
+            sock = None
+            sockfile = None
+            continue
+        break
+    if not sock:
+        syslog.syslog("gpsd is not running or is unreachable")
+        return None
+    else:
+        return sockfile
+
+def wake_up_gpsd(devpath):
+    # First, discover the device
+    subnodes = glob.glob("/sys" + devpath + "/*")
+    subnodes = map(os.path.basename, subnodes)
+    subnodes = filter(lambda s: s.startswith("ttyUSB"), subnodes) 
+    if len(subnodes) == 0:
+        syslog.syslog("no ttyUSB device under " + devpath)
+        return
+    elif len(subnodes) > 1:
+        syslog.syslog("too many ttyUSB devices under " + devpath)
+        return
+    else:
+        tty = "/dev/" + subnodes[0]
+        syslog.syslog(tty + " has gone active")
+
+        # Next get a connection to gpsd; start one if not already running
+        connect = gpsd_connect()
+        if connect:
+            syslog.syslog("reached a running gpsd")
+        else:
+            syslog.syslog("attempting to launch gpsd")
+            os.system("/etc/init.d/gpsd start")
+            connect = gpsd_connect()
+        if not connect:
+            return
+
+        # We've got a live connection to gpsd. Ship it the right F command.
+        # No need to look at the response; gpsd will lock on to the device
+        # if it's really a GPS and ignore it if it's not.
+        connect.write("F=%s\r\n" % tty)
+        connect.close()
+        return
+
+# GPSes don't have their own USB device class.  They're serial-over-USB 
+# devices, so what you see is actually the ID of the serial-over-USB chip.
+# Fortunately, just two of these account for over 80% of consumer-grade 
+# GPS sensors.
+#
+# The Prolific Technology 2303 (commonly in tandem with SiRF chips)
+# FTDI 8U232AM
+# Cypress M8/CY7C64013 (DeLorme uses these)
+supported_products = ("67B/2303", "403/6001", "1163/100")
+
+if __name__ == '__main__':
+    action  = os.getenv("ACTION")
+    devpath = os.getenv("DEVPATH")
+    product = os.getenv("PRODUCT")
+    syslog.openlog('gpsdplug', 0, syslog.LOG_DAEMON)
+    syslog.syslog("gpsdplug begins with action %s" % action)
+    syslog.syslog("PRODUCT = %s, DEVPATH = %s" % (product, devpath))
+    if not devpath or not action:
+	pass
+    elif not filter(lambda x: product.startswith(x + "/"), supported_products):
+        pass
+    elif action == "add":
+	wake_up_gpsd(devpath)
+    syslog.syslog("gpsdplug ends")
+    syslog.closelog()
+
+
+
+