diff mbox series

[lora-next,01/11] net: lora: sx125x: Abort on wrong version

Message ID 20190106083754.6004-2-afaerber@suse.de
State New
Headers show
Series [lora-next,01/11] net: lora: sx125x: Abort on wrong version | expand

Commit Message

Andreas Färber Jan. 6, 2019, 8:37 a.m. UTC 
This helps detect issues such as the concentrator being in reset.

Enhance error output while at it.

Signed-off-by: Andreas Färber <afaerber@suse.de>

---
 drivers/net/lora/sx125x.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

-- 
2.16.4
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Patch

diff --git a/drivers/net/lora/sx125x.c b/drivers/net/lora/sx125x.c
index 90e7cdb9d1a8..0228d1f887a0 100644
--- a/drivers/net/lora/sx125x.c
+++ b/drivers/net/lora/sx125x.c
@@ -195,9 +195,13 @@  static int __maybe_unused sx125x_regmap_probe(struct device *dev, struct regmap
 	if (true) {
 		ret = regmap_read(priv->regmap, SX1255_VERSION, &val);
 		if (ret) {
-			dev_err(dev, "version read failed\n");
+			dev_err(dev, "version read failed (%d)\n", ret);
 			return ret;
 		}
+		if (val != 0x21) {
+			dev_err(dev, "unexpected version: %u\n", val);
+			return -EINVAL;
+		}
 		dev_info(dev, "SX125x version: %02x\n", val);
 	}