From fb01947189a2fb13c8e4b3ff14d0ebed4897cd3b Mon Sep 17 00:00:00 2001
From: Ian Lepore <ian@FreeBSD.org>
Date: Tue, 26 Feb 2019 20:50:49 +0000
Subject: [PATCH] Add support for geom_flashmap by providing a getattr() for
 "SPI:device".

---
 sys/dev/flash/at45d.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/sys/dev/flash/at45d.c b/sys/dev/flash/at45d.c
index 8a948dc4e18..8acf2b95f95 100644
--- a/sys/dev/flash/at45d.c
+++ b/sys/dev/flash/at45d.c
@@ -119,6 +119,7 @@ static device_probe_t at45d_probe;
 /* disk routines */
 static int at45d_close(struct disk *dp);
 static int at45d_open(struct disk *dp);
+static int at45d_getattr(struct bio *bp);
 static void at45d_strategy(struct bio *bp);
 static void at45d_task(void *arg);
 
@@ -338,6 +339,7 @@ at45d_delayed_attach(void *xsc)
 	sc->disk->d_open = at45d_open;
 	sc->disk->d_close = at45d_close;
 	sc->disk->d_strategy = at45d_strategy;
+	sc->disk->d_getattr = at45d_getattr;
 	sc->disk->d_name = "flash/at45d";
 	sc->disk->d_drv1 = sc;
 	sc->disk->d_maxsize = DFLTPHYS;
@@ -368,6 +370,22 @@ at45d_close(struct disk *dp)
 	return (0);
 }
 
+static int
+at45d_getattr(struct bio *bp)
+{
+	struct at45d_softc *sc;
+
+	if (bp->bio_disk == NULL || bp->bio_disk->d_drv1 == NULL)
+		return (ENXIO);
+	if (strcmp(bp->bio_attribute, "SPI::device") != 0)
+		return (-1);
+	sc = bp->bio_disk->d_drv1;
+	if (bp->bio_length != sizeof(sc->dev))
+		return (EFAULT);
+	bcopy(&sc->dev, bp->bio_data, sizeof(sc->dev));
+	return (0);
+}
+
 static void
 at45d_strategy(struct bio *bp)
 {