From 5af4ab652469157a34bf067ce348ce866cbbb7f0 Mon Sep 17 00:00:00 2001
From: Ian Lepore <ian@FreeBSD.org>
Date: Mon, 13 Aug 2018 23:53:11 +0000
Subject: [PATCH] Export the eeprom device size via readonly sysctl.  Also
 export the write page size and address size, although they are likely to be
 inherently less-interesting values outside of the driver.

---
 sys/dev/iicbus/icee.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/sys/dev/iicbus/icee.c b/sys/dev/iicbus/icee.c
index d3472d17eab..364099703b0 100644
--- a/sys/dev/iicbus/icee.c
+++ b/sys/dev/iicbus/icee.c
@@ -40,6 +40,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/module.h>
 #include <sys/resource.h>
 #include <sys/sx.h>
+#include <sys/sysctl.h>
 #include <sys/uio.h>
 #include <machine/bus.h>
 
@@ -186,6 +187,8 @@ static int
 icee_attach(device_t dev)
 {
 	struct icee_softc *sc = device_get_softc(dev);
+	struct sysctl_ctx_list *ctx;
+	struct sysctl_oid_list *tree;
 
 	sc->dev = dev;
 	sc->addr = iicbus_get_addr(dev);
@@ -205,6 +208,16 @@ icee_attach(device_t dev)
 		return (ENOMEM);
 	}
 	sc->cdev->si_drv1 = sc;
+
+	ctx = device_get_sysctl_ctx(dev);
+	tree = SYSCTL_CHILDREN(device_get_sysctl_tree(dev));
+	SYSCTL_ADD_INT(ctx, tree, OID_AUTO, "address_size", CTLFLAG_RD,
+	    &sc->type, 0, "Memory array address size in bits");
+	SYSCTL_ADD_INT(ctx, tree, OID_AUTO, "device_size", CTLFLAG_RD,
+	    &sc->size, 0, "Memory array capacity in bytes");
+	SYSCTL_ADD_INT(ctx, tree, OID_AUTO, "write_size", CTLFLAG_RD,
+	    &sc->wr_sz, 0, "Memory array page write size in bytes");
+
 	return (0);
 }