[PATCH 7/7] HID: amd_sfh: Handle "no sensors" enabled for SFH1.1

[Basavaraj Natikar <Basavaraj.Natikar@amd.com>]

Based on num_hid_devices, each sensor device is initialized. If
"no sensors" is initialized, amd_sfh work initialization and scheduling
doesn’t make sense and returns EOPNOTSUPP to stop driver probe. Hence,
add a check for "no sensors" enabled to handle the special case.

Fixes: 93ce5e0231d7 ("HID: amd_sfh: Implement SFH1.1 functionality")
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
---
 drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c b/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c
index a1d6e08fab7d..bb8bd7892b67 100644
--- a/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c
+++ b/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c
@@ -112,6 +112,7 @@ static int amd_sfh1_1_hid_client_init(struct amd_mp2_dev *privdata)
 	cl_data->num_hid_devices = amd_sfh_get_sensor_num(privdata, &cl_data->sensor_idx[0]);
 	if (cl_data->num_hid_devices == 0)
 		return -ENODEV;
+	cl_data->is_any_sensor_enabled = false;
 
 	INIT_DELAYED_WORK(&cl_data->work, amd_sfh_work);
 	INIT_DELAYED_WORK(&cl_data->work_buffer, amd_sfh_work_buffer);
@@ -170,6 +171,7 @@ static int amd_sfh1_1_hid_client_init(struct amd_mp2_dev *privdata)
 		status = (status == 0) ? SENSOR_ENABLED : SENSOR_DISABLED;
 
 		if (status == SENSOR_ENABLED) {
+			cl_data->is_any_sensor_enabled = true;
 			cl_data->sensor_sts[i] = SENSOR_ENABLED;
 			rc = amdtp_hid_probe(i, cl_data);
 			if (rc) {
@@ -186,12 +188,21 @@ static int amd_sfh1_1_hid_client_init(struct amd_mp2_dev *privdata)
 					cl_data->sensor_sts[i]);
 				goto cleanup;
 			}
+		} else {
+			cl_data->sensor_sts[i] = SENSOR_DISABLED;
 		}
 		dev_dbg(dev, "sid 0x%x (%s) status 0x%x\n",
 			cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
 			cl_data->sensor_sts[i]);
 	}
 
+	if (!cl_data->is_any_sensor_enabled) {
+		dev_warn(dev, "Failed to discover, sensors not enabled is %d\n",
+			 cl_data->is_any_sensor_enabled);
+		rc = -EOPNOTSUPP;
+		goto cleanup;
+	}
+
 	schedule_delayed_work(&cl_data->work_buffer, msecs_to_jiffies(AMD_SFH_IDLE_LOOP));
 	return 0;
 
-- 
2.25.1