From 781c0004e3f634ba931e588cc5af49f1268a95e5 Mon Sep 17 00:00:00 2001
From: Dominik Sliwa <dominik.sliwa@toradex.com>
Date: Tue, 18 Sep 2018 17:35:14 +0200
Subject: mt7601u: compile on tegra 3.1 and 3.10 kernels

Signed-off-by: Dominik Sliwa <dominik.sliwa@toradex.com>
---
 compat/backport-4.12.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

(limited to 'compat')

diff --git a/compat/backport-4.12.c b/compat/backport-4.12.c
index 8f3e5ab..5cab315 100644
--- a/compat/backport-4.12.c
+++ b/compat/backport-4.12.c
@@ -280,12 +280,77 @@ int bp_extack_genl_unregister_family(struct genl_family *family)
 EXPORT_SYMBOL_GPL(bp_extack_genl_unregister_family);
 
 #ifdef CONFIG_OF
+#if LINUX_VERSION_IS_LESS(4,4,0)
+static ssize_t bp_of_device_get_modalias(struct device *dev, char *str, ssize_t len)
+{
+	const char *compat;
+	char *c;
+	struct property *p;
+	ssize_t csize;
+	ssize_t tsize;
+
+	if ((!dev) || (!dev->of_node))
+		return -ENODEV;
+
+	/* Name & Type */
+	csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
+			 dev->of_node->type);
+	tsize = csize;
+	len -= csize;
+	if (str)
+		str += csize;
+
+	of_property_for_each_string(dev->of_node, "compatible", p, compat) {
+		csize = strlen(compat) + 1;
+		tsize += csize;
+		if (csize > len)
+			continue;
+
+		csize = snprintf(str, len, "C%s", compat);
+		for (c = str; c; ) {
+			c = strchr(c, ' ');
+			if (c)
+				*c++ = '_';
+		}
+		len -= csize;
+		str += csize;
+	}
+
+	return tsize;
+}
+
+int bp_of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
+{
+	int sl;
+
+	if ((!dev) || (!dev->of_node))
+		return -ENODEV;
+
+	/* Devicetree modalias is tricky, we add it in 2 steps */
+	if (add_uevent_var(env, "MODALIAS="))
+		return -ENOMEM;
+
+	sl = bp_of_device_get_modalias(dev, &env->buf[env->buflen-1],
+				    sizeof(env->buf) - env->buflen);
+	if (sl >= (sizeof(env->buf) - env->buflen))
+		return -ENOMEM;
+	env->buflen += sl;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(bp_of_device_uevent_modalias);
+#endif
+
 /**
  * of_device_modalias - Fill buffer with newline terminated modalias string
  */
 ssize_t bp_of_device_modalias(struct device *dev, char *str, ssize_t len)
 {
+#if LINUX_VERSION_IS_LESS(4,4,0)
+	ssize_t sl = bp_of_device_get_modalias(dev, str, len - 2);
+#else
 	ssize_t sl = of_device_get_modalias(dev, str, len - 2);
+#endif
 	if (sl < 0)
 		return sl;
 	if (sl > len - 2)
-- 
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