From 548616f3ead1e1e9b90a540cdd16b27d2ad9e008 Mon Sep 17 00:00:00 2001
From: Taylor R Campbell <riastradh@NetBSD.org>
Date: Sat, 15 Jan 2022 19:18:09 +0000
Subject: [PATCH 07/37] driver(9): New function dev_minor_unit.
---
sys/kern/subr_devsw.c | 15 +++++++++++++++
sys/sys/conf.h | 1 +
2 files changed, 16 insertions(+)
diff --git a/sys/kern/subr_devsw.c b/sys/kern/subr_devsw.c
index d0451363a041..d24480114f94 100644
--- a/sys/kern/subr_devsw.c
+++ b/sys/kern/subr_devsw.c
@@ -1299,3 +1299,18 @@ nommap(dev_t dev, off_t off, int prot)
return (paddr_t)-1;
}
+
+/*
+ * dev_minor_unit(dev)
+ *
+ * Returns minor(dev) as an int. Intended for use with struct
+ * bdevsw, cdevsw::d_devtounit for drivers whose /dev nodes are
+ * implemented by reference to an autoconf instance with the minor
+ * number.
+ */
+int
+dev_minor_unit(dev_t dev)
+{
+
+ return minor(dev);
+}
diff --git a/sys/sys/conf.h b/sys/sys/conf.h
index 12cfd3bf89a6..cb4c287d1982 100644
--- a/sys/sys/conf.h
+++ b/sys/sys/conf.h
@@ -280,6 +280,7 @@ devmajor_t devsw_name2blk(const char *, char *, size_t);
devmajor_t devsw_name2chr(const char *, char *, size_t);
dev_t devsw_chr2blk(dev_t);
dev_t devsw_blk2chr(dev_t);
+int dev_minor_unit(dev_t);
void mm_init(void);
#endif /* _KERNEL */