[PATCH v2 5/6] HID: hid-lenovo-go: reject unknown calibration action

The calibration action table includes 'unknown' at index zero. The options
attribute skips that entry and lists only 'start' and 'stop', but the
store searches the full table. Writing 'unknown' therefore sends a request
without an action byte.

Reject CAL_UNKNOWN before building the request. Leave Start and Stop
unchanged.

Fixes: 995887a10da1 ("HID: hid-lenovo-go: Add Calibration Settings")
Assisted-by: Pi:gpt-5.6-sol
Signed-off-by: Aditya Dash <redacted>
---
 drivers/hid/hid-lenovo-go.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hid/hid-lenovo-go.c b/drivers/hid/hid-lenovo-go.c
index c7a2e621a4ad..a4231d188b7a 100644
--- a/drivers/hid/hid-lenovo-go.c
+++ b/drivers/hid/hid-lenovo-go.c

@@ -1419,6 +1419,8 @@ static ssize_t calibrate_config_store(struct device *dev,
 	ret = sysfs_match_string(cal_enabled_text, buf);
 	if (ret < 0)
 		return ret;
+	if (ret == CAL_UNKNOWN)
+		return -EINVAL;
 
 	val = ret;
 	if (!val)

-- 
2.55.0