From cd1a145e10cd789b112d812affa6d82cd301dfd2 Mon Sep 17 00:00:00 2001
From: Javier Viguera <javier.viguera@digi.com>
Date: Tue, 28 Nov 2017 18:55:43 +0100
Subject: [PATCH] libsoc: patch library to allow udev events to complete

After exporting a GPIO or PWM, we need to give some time for udev rules
to complete, before actually trying to access the newly created entries
in the sysfs.

This solves a problem, where udev was setting the mode and group of
the newly created files, so they are accessible for users (not root)
belonging to that group.

For traceability and to be sure the patch applies without conflicts,
this commit also sets a fixed revision to use from the libsoc
repository.

https://jira.digi.com/browse/DEL-5389

Signed-off-by: Javier Viguera <javier.viguera@digi.com>
---
 ...elay-to-allow-udev-rules-to-complete.patch | 46 +++++++++++++++++++
 .../libsoc/libsoc_git.bbappend                |  7 ++-
 2 files changed, 51 insertions(+), 2 deletions(-)
 create mode 100644 meta-digi-dey/recipes-support/libsoc/libsoc/0001-gpio-pwm-add-delay-to-allow-udev-rules-to-complete.patch

diff --git a/meta-digi-dey/recipes-support/libsoc/libsoc/0001-gpio-pwm-add-delay-to-allow-udev-rules-to-complete.patch b/meta-digi-dey/recipes-support/libsoc/libsoc/0001-gpio-pwm-add-delay-to-allow-udev-rules-to-complete.patch
new file mode 100644
index 000000000..911b7f964
--- /dev/null
+++ b/meta-digi-dey/recipes-support/libsoc/libsoc/0001-gpio-pwm-add-delay-to-allow-udev-rules-to-complete.patch
@@ -0,0 +1,46 @@
+From: Javier Viguera <javier.viguera@digi.com>
+Date: Tue, 28 Nov 2017 17:39:05 +0100
+Subject: [PATCH] gpio,pwm: add delay to allow udev rules to complete
+
+After exporting a GPIO or PWM, we need to give some time for udev rules
+to complete, before actually trying to access the newly created entries
+in the sysfs.
+
+This solves a problem, where udev was setting the mode and group of
+the newly created files, so they are accessible for users (not root)
+belonging to that group.
+
+Signed-off-by: Javier Viguera <javier.viguera@digi.com>
+---
+ lib/gpio.c | 3 +++
+ lib/pwm.c  | 3 +++
+ 2 files changed, 6 insertions(+)
+
+diff --git a/lib/gpio.c b/lib/gpio.c
+index bc509f8f09d7..527f2be649a4 100644
+--- a/lib/gpio.c
++++ b/lib/gpio.c
+@@ -104,6 +104,9 @@ libsoc_gpio_request (unsigned int gpio_id, gpio_mode mode)
+       if (file_close (fd))
+ 	return NULL;
+ 
++      /* Give udev some time to execute the rules of the exported GPIO */
++      usleep(200000);
++
+       sprintf (tmp_str, "/sys/class/gpio/gpio%d", gpio_id);
+ 
+       if (!file_valid (tmp_str))
+diff --git a/lib/pwm.c b/lib/pwm.c
+index 94a20d9be281..ed6dec8ee2a9 100644
+--- a/lib/pwm.c
++++ b/lib/pwm.c
+@@ -88,6 +88,9 @@ pwm* libsoc_pwm_request (unsigned int chip, unsigned int pwm_num,
+       return NULL;
+     }
+ 
++    /* Give udev some time to execute the rules of the exported PWM */
++    usleep(200000);
++
+     sprintf(tmp_str, "/sys/class/pwm/pwmchip%d/pwm%d/enable", chip, pwm_num);
+ 
+     if (!file_valid(tmp_str))
diff --git a/meta-digi-dey/recipes-support/libsoc/libsoc_git.bbappend b/meta-digi-dey/recipes-support/libsoc/libsoc_git.bbappend
index 04ef0b60d..70d0ba51e 100644
--- a/meta-digi-dey/recipes-support/libsoc/libsoc_git.bbappend
+++ b/meta-digi-dey/recipes-support/libsoc/libsoc_git.bbappend
@@ -1,12 +1,15 @@
 # Copyright (C) 2017 Digi International Inc.
 
+FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"
+
 LIBSOC_URI_STASH = "${DIGI_MTK_GIT}dey/libsoc.git;protocol=ssh"
 LIBSOC_URI_GITHUB = "git://github.com/jackmitch/libsoc.git;protocol=git"
 LIBSOC_URI ?= "${@base_conditional('DIGI_INTERNAL_GIT', '1' , '${LIBSOC_URI_STASH}', '${LIBSOC_URI_GITHUB}', d)}"
 
+SRCREV = "dc62bb1f04c13d0423078b1af2bb439c62023d6c"
 SRC_URI = " \
-    ${LIBSOC_URI};branch=${SRCBRANCH} \
+    ${LIBSOC_URI};nobranch=1 \
+    file://0001-gpio-pwm-add-delay-to-allow-udev-rules-to-complete.patch \
 "
 
 PACKAGECONFIG = "python"
-