media: ccs: Differentiate SMIA and MIPI vendors in static data

MIPI CCS uses a 16-bit MIPI manufacturer identifier for firmware filenames
compared to older 8-bit identifier used by SMIA. The requested firmware
files used the MIPI manufacturer ID even for SMIA compliant devices,
effectively making the manufacturer ID 0.

While CCS static data is a feature of CCS 1.1, it has no hardware
dependencies. Making this feature available for SMIA devices helps adding
support for them and avoids requesting ill-generated CCS static data file
names. The files are named as:

	ccs/smiapp-module-vv-mmmm-rrrr.fw,
	ccs/smiapp-sensor-vv-mmmm-rr.fw and
	ccs/smia-sensor-vv-mmmm-rr.fw

where vv is the manufacturer ID, mmmm is the model ID and rr or rrrr is
the revision number.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/i2c/ccs/ccs-core.c

@@ -3271,8 +3271,47 @@ static int ccs_get_hwconfig(struct ccs_sensor *sensor, struct device *dev)
 	return rval;
 }
 
+static int ccs_firmware_name(struct i2c_client *client,
+			     struct ccs_sensor *sensor, char *filename,
+			     size_t filename_size, bool is_module)
+{
+	const struct ccs_device *ccsdev = device_get_match_data(&client->dev);
+	bool is_ccs = !(ccsdev->flags & CCS_DEVICE_FLAG_IS_SMIA);
+	bool is_smiapp = sensor->minfo.smiapp_version;
+	u16 manufacturer_id;
+	u16 model_id;
+	u16 revision_number;
+
+	/*
+	 * Old SMIA is module-agnostic. Its sensor identification is based on
+	 * what now are those of the module.
+	 */
+	if (is_module || (!is_ccs && !is_smiapp)) {
+		manufacturer_id = is_ccs ?
+			sensor->minfo.mipi_manufacturer_id :
+			sensor->minfo.smia_manufacturer_id;
+		model_id = sensor->minfo.model_id;
+		revision_number = sensor->minfo.revision_number;
+	} else {
+		manufacturer_id = is_ccs ?
+			sensor->minfo.sensor_mipi_manufacturer_id :
+			sensor->minfo.sensor_smia_manufacturer_id;
+		model_id = sensor->minfo.sensor_model_id;
+		revision_number = sensor->minfo.sensor_revision_number;
+	}
+
+	return snprintf(filename, filename_size,
+			"ccs/%s-%s-%0*x-%4.4x-%0*x.fw",
+			is_ccs ? "ccs" : is_smiapp ? "smiapp" : "smia",
+			is_module || (!is_ccs && !is_smiapp) ?
+				"module" : "sensor",
+			is_ccs ? 4 : 2, manufacturer_id, model_id,
+			!is_ccs && !is_module ? 2 : 4, revision_number);
+}
+
 static int ccs_probe(struct i2c_client *client)
 {
+	const struct ccs_device *ccsdev = device_get_match_data(&client->dev);
 	struct ccs_sensor *sensor;
 	const struct firmware *fw;
 	char filename[40];
@@ -3381,11 +3420,8 @@ static int ccs_probe(struct i2c_client *client)
 		goto out_power_off;
 	}
 
-	rval = snprintf(filename, sizeof(filename),
-			"ccs/ccs-sensor-%4.4x-%4.4x-%4.4x.fw",
-			sensor->minfo.sensor_mipi_manufacturer_id,
-			sensor->minfo.sensor_model_id,
-			sensor->minfo.sensor_revision_number);
+	rval = ccs_firmware_name(client, sensor, filename, sizeof(filename),
+				 false);
 	if (rval >= sizeof(filename)) {
 		rval = -ENOMEM;
 		goto out_power_off;
@@ -3398,21 +3434,21 @@ static int ccs_probe(struct i2c_client *client)
 		release_firmware(fw);
 	}
 
-	rval = snprintf(filename, sizeof(filename),
-			"ccs/ccs-module-%4.4x-%4.4x-%4.4x.fw",
-			sensor->minfo.mipi_manufacturer_id,
-			sensor->minfo.model_id,
-			sensor->minfo.revision_number);
-	if (rval >= sizeof(filename)) {
-		rval = -ENOMEM;
-		goto out_release_sdata;
-	}
+	if (!(ccsdev->flags & CCS_DEVICE_FLAG_IS_SMIA) ||
+	    sensor->minfo.smiapp_version) {
+		rval = ccs_firmware_name(client, sensor, filename,
+					 sizeof(filename), true);
+		if (rval >= sizeof(filename)) {
+			rval = -ENOMEM;
+			goto out_release_sdata;
+		}
 
-	rval = request_firmware(&fw, filename, &client->dev);
-	if (!rval) {
-		ccs_data_parse(&sensor->mdata, fw->data, fw->size, &client->dev,
-			       true);
-		release_firmware(fw);
+		rval = request_firmware(&fw, filename, &client->dev);
+		if (!rval) {
+			ccs_data_parse(&sensor->mdata, fw->data, fw->size,
+				       &client->dev, true);
+			release_firmware(fw);
+		}
 	}
 
 	rval = ccs_read_all_limits(sensor);