From a45357940a07e524a4a4798ecdd5f58dc0b130d0 Mon Sep 17 00:00:00 2001
From: Javier Viguera <javier.viguera@digi.com>
Date: Mon, 27 Nov 2017 13:56:43 +0100
Subject: [PATCH] libdigiapix: add udev rules for digiapix API

These udev rules allow to use the digiapix API by a normal user that
belongs to the 'digiapix' group.

https://jira.digi.com/browse/DEL-5232

Signed-off-by: Javier Viguera <javier.viguera@digi.com>
---
 .../libdigiapix-git/99-digiapix.rules         | 22 +++++++++++++
 .../libdigiapix/libdigiapix-git/digiapix.sh   | 31 +++++++++++++++++++
 .../libdigiapix/libdigiapix_git.bb            |  9 +++++-
 3 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 meta-digi-dey/recipes-digi/libdigiapix/libdigiapix-git/99-digiapix.rules
 create mode 100644 meta-digi-dey/recipes-digi/libdigiapix/libdigiapix-git/digiapix.sh

diff --git a/meta-digi-dey/recipes-digi/libdigiapix/libdigiapix-git/99-digiapix.rules b/meta-digi-dey/recipes-digi/libdigiapix/libdigiapix-git/99-digiapix.rules
new file mode 100644
index 000000000..04ec742bb
--- /dev/null
+++ b/meta-digi-dey/recipes-digi/libdigiapix/libdigiapix-git/99-digiapix.rules
@@ -0,0 +1,22 @@
+# libdigiapix: configure interfaces so they can be used by group 'digiapix'
+
+SUBSYSTEM=="i2c-dev", GROUP="digiapix", MODE="0660"
+SUBSYSTEM=="spidev",  GROUP="digiapix", MODE="0660"
+
+#
+# Use two different rules for GPIO's.
+#
+#   1. The first rule (gpiochip0) allows to configure the GROUP and MODE of
+#      the 'export' and 'unexport' files. This is basically executed once on
+#      boot and it's needed so a normal user (with group 'digiapix')
+#      is able to export/unexport gpios.
+#
+#   2. The second rule configures the GROUP and MODE of the sysfs files that
+#      are created whenever a 'gpio' is exported.
+#
+# This way we filter out multiple gpiochipX events that we don't want to attend
+#
+SUBSYSTEM=="gpio", KERNEL=="gpiochip0", ACTION=="add", RUN="/etc/udev/scripts/digiapix.sh"
+SUBSYSTEM=="gpio", KERNEL!="gpiochip*", ACTION=="add", RUN="/etc/udev/scripts/digiapix.sh"
+
+SUBSYSTEM=="pwm", ACTION=="add", RUN="/etc/udev/scripts/digiapix.sh"
diff --git a/meta-digi-dey/recipes-digi/libdigiapix/libdigiapix-git/digiapix.sh b/meta-digi-dey/recipes-digi/libdigiapix/libdigiapix-git/digiapix.sh
new file mode 100644
index 000000000..bc3897c85
--- /dev/null
+++ b/meta-digi-dey/recipes-digi/libdigiapix/libdigiapix-git/digiapix.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+#
+# Copyright (c) 2017, Digi International Inc.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, you can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+#
+
+if basename "${DEVPATH}" | grep -qs "gpiochip0$"; then
+	# Use 'gpiochip0' event to set group and mode for 'export/unexport' files
+	chown root:digiapix /sys/class/gpio/export /sys/class/gpio/unexport
+	chmod g+w /sys/class/gpio/export /sys/class/gpio/unexport
+elif basename "${DEVPATH}" | grep -qs "pwmchip[0-9]\+$"; then
+	# Set group and mode for pwmchip's 'export/unexport' files
+	chown root:digiapix /sys${DEVPATH}/export /sys${DEVPATH}/unexport
+	chmod g+w /sys${DEVPATH}/export /sys${DEVPATH}/unexport
+else
+	# Change group and mode of the sysfs files created whenever a 'gpioX'
+	# or 'pwmX' is exported
+	chown -h root:digiapix /sys${DEVPATH}/*
+	chmod g+w /sys${DEVPATH}/*
+fi
diff --git a/meta-digi-dey/recipes-digi/libdigiapix/libdigiapix_git.bb b/meta-digi-dey/recipes-digi/libdigiapix/libdigiapix_git.bb
index 88517db7d..7d67c9075 100644
--- a/meta-digi-dey/recipes-digi/libdigiapix/libdigiapix_git.bb
+++ b/meta-digi-dey/recipes-digi/libdigiapix/libdigiapix_git.bb
@@ -18,7 +18,9 @@ LIBDIGIAPIX_GIT_URI ?= "${@base_conditional('DIGI_INTERNAL_GIT', '1' , '${LIBDIG
 
 SRC_URI = " \
     ${LIBDIGIAPIX_GIT_URI};branch=${SRCBRANCH} \
+    file://99-digiapix.rules \
     file://board.conf \
+    file://digiapix.sh \
 "
 
 S = "${WORKDIR}/git"
@@ -28,7 +30,12 @@ inherit pkgconfig useradd
 do_install() {
 	oe_runmake 'DESTDIR=${D}' install
 
-	install -d ${D}${sysconfdir}/
+	# Install udev rules for digiapix
+	install -d ${D}${sysconfdir}/udev/rules.d ${D}${sysconfdir}/udev/scripts
+	install -m 0644 ${WORKDIR}/99-digiapix.rules ${D}${sysconfdir}/udev/rules.d/
+	install -m 0755 ${WORKDIR}/digiapix.sh ${D}${sysconfdir}/udev/scripts/
+
+	# Install board config file
 	install -m 0644 ${WORKDIR}/board.conf ${D}${sysconfdir}/libdigiapix.conf
 }