From: Thomas Cort <tcort@minix3.org>
Date: Thu, 22 Aug 2013 15:22:01 +0000 (-0400)
Subject: rc: start drivers for attached BeagleBone Capes
X-Git-Tag: v3.3.0~824
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/doxygen.log?a=commitdiff_plain;h=e7855d00efd4596ea20a92f711e55813d88e0d28;p=minix.git

rc: start drivers for attached BeagleBone Capes

BeagleBone Capes add additional hardware to the BeagleBone to
improve functionality.

This patch probes the third i2c bus for capes and loads the
appropriate drivers for each detected cape. Currently only
the 'BeagleBone Weather' cape is supported.

Change-Id: Id8c133810db6de7c21625c2d5a794b8874673a0f
---

diff --git a/distrib/sets/lists/minix/md.evbarm b/distrib/sets/lists/minix/md.evbarm
index 95360b4cb..0c38ead57 100644
--- a/distrib/sets/lists/minix/md.evbarm
+++ b/distrib/sets/lists/minix/md.evbarm
@@ -4,6 +4,8 @@
 ./boot/minix/.temp/mod10_vm		minix-sys
 ./boot/minix/.temp/mod11_pfs		minix-sys
 ./boot/minix/.temp/mod12_init		minix-sys
+./etc/rc.capes				minix-sys
+./etc/rc.capes/BB-BONE-WTHR-01		minix-sys
 ./etc/system.conf.d/lan8710a		minix-sys
 ./multiboot/mod07_log			minix-sys
 ./multiboot/mod08_tty			minix-sys
diff --git a/etc/Makefile b/etc/Makefile
index 0092b03c3..f070c3a3b 100644
--- a/etc/Makefile
+++ b/etc/Makefile
@@ -458,6 +458,11 @@ install-etc-files-safe: .PHONY .MAKE check_DESTDIR MAKEDEV
 	fi; \
 	${INSTALL_FILE} -o ${owner} -g ${group} -m ${mode} ${sdir}${files} ${tdir};
 .endfor
+.if ${MACHINE_ARCH} == "earm"
+	${_MKMSG_INSTALL} ${DESTDIR}/etc/rc.capes
+	${INSTALL_DIR} ${DESTDIR}/etc/rc.capes
+	${INSTALL_FILE} -m ${BINMODE} -o ${BINOWN} -g ${BINGRP} ${NETBSDSRCDIR}/etc/rc.capes/* ${DESTDIR}/etc/rc.capes
+.endif # Minix/earm specific
 .for subdir in . defaults mtree
 	${MAKEDIRTARGET} ${subdir} configinstall
 .endfor
diff --git a/etc/rc.capes/BB-BONE-WTHR-01 b/etc/rc.capes/BB-BONE-WTHR-01
new file mode 100644
index 000000000..a8c58f790
--- /dev/null
+++ b/etc/rc.capes/BB-BONE-WTHR-01
@@ -0,0 +1,19 @@
+#!/bin/sh
+#
+# Start-up script for the BeagleBone Weather cape.
+
+# TSL2550 Ambient Light Sensor
+test -e /dev/tsl2550b3s39 || (cd /dev && MAKEDEV tsl2550b3s39)
+/bin/service up /usr/sbin/tsl2550 -dev /dev/tsl2550b3s39 \
+	-label tsl2550.3.39 -args 'bus=3 address=0x39' && echo -n " tsl2550"
+
+# SHT21 Temperature and Humidity Sensor
+test -e /dev/sht21b3s40 || (cd /dev && MAKEDEV sht21b3s40)
+/bin/service up /usr/sbin/sht21 -dev /dev/sht21b3s40 \
+	-label sht21.3.40 -args 'bus=3 address=0x40' && echo -n " sht21"
+
+# BMP085 Temperature and Pressure Sensor
+test -e /dev/bmp085b3s77 || (cd /dev && MAKEDEV bmp085b3s77)
+/bin/service up /usr/sbin/bmp085 -dev /dev/bmp085b3s77 \
+	-label bmp085.3.77 -args 'bus=3 address=0x77' && echo -n " bmp085"
+
diff --git a/etc/usr/rc b/etc/usr/rc
index 7dfb42ffd..51f802a98 100644
--- a/etc/usr/rc
+++ b/etc/usr/rc
@@ -112,6 +112,49 @@ get_eth_labels() {
     grep -v '^vlan_'
 }
 
+# Detect expansion boards on the BeagleBone and load the proper drivers.
+capemgr() {
+
+    # Probe each possible cape EEPROM slave address for a BeagleBone cape.
+    for slave_addr in 54 55 56 57
+    do
+
+        # See if there is a readable EEPROM with address ${slave_addr}.
+        eepromread -f /dev/i2c-3 -a 0x${slave_addr} > /dev/null 2>&1
+        RESULT=$?
+	if [ $RESULT -eq 0 ]
+	then
+
+	    # Found an alive EEPROM. Try reading the cape name.
+            CAPE=`eepromread -i -f /dev/i2c-3 -a 0x${slave_addr} | \
+	        sed -n 's/^PART_NUMBER     : \(.*\)$/\1/p' | \
+		sed -e 's/\.*$//g'` # Strip trailing periods.
+
+	    # Look for a cape specific RC script.
+            if [ -x /etc/rc.capes/${CAPE} ]
+	    then
+
+	        # CAT24C256 EEPROM -- all capes have this chip.
+		test -e /dev/eepromb3s${slave_addr} || \
+		    (cd /dev && MAKEDEV eepromb3s${slave_addr})
+		up cat24c256 -dev /dev/eepromb3s${slave_addr} \
+		    -label cat24c256.3.${slave_addr} \
+		    -args "bus=3 address=0x${slave_addr}"
+
+                # Load the drivers for the cape and do any other configuration.
+		. "/etc/rc.capes/${CAPE}"
+
+	    else
+
+		echo ""
+	        echo "** UNSUPPORTED CAPE: ${CAPE}"
+		echo ""
+
+	    fi
+	fi
+    done
+}
+
 DAEMONS=/etc/rc.daemons
 
 case $action in
@@ -230,6 +273,9 @@ start)
 				# fb hasn't been ported to AM335X yet.
 			fi
 
+			# Detect expansion boards and start drivers.
+			capemgr
+
 			;;
 
 		A335BNLT)
@@ -255,6 +301,9 @@ start)
 			#up fb -dev /dev/fb0 -args edid.0=tda19988.1.3470
 			# fb hasn't been ported to AM335X yet.
 
+			# Detect expansion boards and start drivers.
+			capemgr
+
 			;;
 
 		UNKNOWN)