media: ipu3-cio2: Add support for instantiating i2c-clients for VCMs

Some sensors come with a variable-focus lens where the lens focus is
controller by a VCM (Voice Coil Motor). If there is a VCM for the
lens-focus, and if so which one, is described on the vcm_type field
of the ACPI SSDB table.

These VCMs are a second I2C device listed as an extra I2cSerialBusV2
resource in the same ACPI device as the sensor. The i2c-core-acpi.c
code only instantiates an i2c-client for the first I2cSerialBusV2
resource.

Add support for instantiating an i2c-client for the VCM with
the type of the i2c-client set based on the SSDB vcm_type field.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

Author: jwrdegoede

drivers/media/pci/intel/ipu3/cio2-bridge.c

@@ -3,6 +3,7 @@
 
 #include <linux/acpi.h>
 #include <linux/device.h>
+#include <linux/i2c.h>
 #include <linux/pci.h>
 #include <linux/property.h>
 #include <media/v4l2-fwnode.h>
@@ -38,6 +39,18 @@ static const struct cio2_property_names prop_names = {
 	.link_frequencies = "link-frequencies",
 };
 
+static const char * const cio2_vcm_types[] = {
+	"ad5823",
+	"dw9714",
+	"ad5816",
+	"dw9719",
+	"dw9718",
+	"dw9806b",
+	"wv517s",
+	"lc898122xa",
+	"lc898212axb",
+};
+
 static int cio2_bridge_read_acpi_buffer(struct acpi_device *adev, char *id,
 					void *data, u32 size)
 {
@@ -134,6 +147,12 @@ static void cio2_bridge_create_fwnode_properties(
 	sensor->dev_properties[2] = PROPERTY_ENTRY_U32(
 					sensor->prop_names.orientation,
 					orientation);
+	if (sensor->ssdb.vcmtype) {
+		sensor->vcm_ref[0] =
+			SOFTWARE_NODE_REFERENCE(&sensor->swnodes[SWNODE_VCM]);
+		sensor->dev_properties[3] =
+			PROPERTY_ENTRY_REF_ARRAY("lens-focus", sensor->vcm_ref);
+	}
 
 	sensor->ep_properties[0] = PROPERTY_ENTRY_U32(
 					sensor->prop_names.bus_type,
@@ -195,6 +214,33 @@ static void cio2_bridge_create_connection_swnodes(struct cio2_bridge *bridge,
 						sensor->node_names.endpoint,
 						&nodes[SWNODE_CIO2_PORT],
 						sensor->cio2_properties);
+	if (sensor->ssdb.vcmtype)
+		nodes[SWNODE_VCM] =
+			NODE_VCM(cio2_vcm_types[sensor->ssdb.vcmtype - 1]);
+}
+
+static void cio2_bridge_instantiate_vcm_i2c_client(struct cio2_sensor *sensor)
+{
+	struct i2c_board_info board_info = { };
+	char name[16];
+
+	if (!sensor->ssdb.vcmtype)
+		return;
+
+	snprintf(name, sizeof(name), "%s-VCM", acpi_dev_name(sensor->adev));
+	board_info.dev_name = name;
+	strscpy(board_info.type, cio2_vcm_types[sensor->ssdb.vcmtype - 1],
+		ARRAY_SIZE(board_info.type));
+	board_info.swnode = &sensor->swnodes[SWNODE_VCM];
+
+	sensor->vcm_i2c_client =
+		i2c_acpi_new_device_by_fwnode(acpi_fwnode_handle(sensor->adev),
+					      1, &board_info);
+	if (IS_ERR(sensor->vcm_i2c_client)) {
+		dev_warn(&sensor->adev->dev, "Error instantiation VCM i2c-client: %ld\n",
+			 PTR_ERR(sensor->vcm_i2c_client));
+		sensor->vcm_i2c_client = NULL;
+	}
 }
 
 static void cio2_bridge_unregister_sensors(struct cio2_bridge *bridge)
@@ -207,6 +253,7 @@ static void cio2_bridge_unregister_sensors(struct cio2_bridge *bridge)
 		software_node_unregister_nodes(sensor->swnodes);
 		ACPI_FREE(sensor->pld);
 		acpi_dev_put(sensor->adev);
+		i2c_unregister_device(sensor->vcm_i2c_client);
 	}
 }
 
@@ -239,6 +286,12 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
 		if (ret)
 			goto err_put_adev;
 
+		if (sensor->ssdb.vcmtype > ARRAY_SIZE(cio2_vcm_types)) {
+			dev_warn(&adev->dev, "Unknown VCM type %d\n",
+				 sensor->ssdb.vcmtype);
+			sensor->ssdb.vcmtype = 0;
+		}
+
 		status = acpi_get_physical_device_location(adev->handle, &sensor->pld);
 		if (ACPI_FAILURE(status)) {
 			ret = -ENODEV;
@@ -269,6 +322,8 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
 		sensor->adev = acpi_dev_get(adev);
 		adev->fwnode.secondary = fwnode;
 
+		cio2_bridge_instantiate_vcm_i2c_client(sensor);
+
 		dev_info(&cio2->dev, "Found supported sensor %s\n",
 			 acpi_dev_name(adev));
 

drivers/media/pci/intel/ipu3/cio2-bridge.h

@@ -8,6 +8,8 @@
 
 #include "ipu3-cio2.h"
 
+struct i2c_client;
+
 #define CIO2_HID				"INT343E"
 #define CIO2_MAX_LANES				4
 #define MAX_NUM_LINK_FREQS			3
@@ -42,12 +44,19 @@
 		.properties = _PROPS,		\
 	}
 
+#define NODE_VCM(_TYPE)				\
+	(const struct software_node) {		\
+		.name = _TYPE,			\
+	}
+
 enum cio2_sensor_swnodes {
 	SWNODE_SENSOR_HID,
 	SWNODE_SENSOR_PORT,
 	SWNODE_SENSOR_ENDPOINT,
 	SWNODE_CIO2_PORT,
 	SWNODE_CIO2_ENDPOINT,
+	/* Must be last because it is optional / maybe empty */
+	SWNODE_VCM,
 	SWNODE_COUNT
 };
 
@@ -106,19 +115,22 @@ struct cio2_sensor_config {
 struct cio2_sensor {
 	char name[ACPI_ID_LEN];
 	struct acpi_device *adev;
+	struct i2c_client *vcm_i2c_client;
 
-	struct software_node swnodes[6];
+	/* SWNODE_COUNT + 1 for terminating empty node */
+	struct software_node swnodes[SWNODE_COUNT + 1];
 	struct cio2_node_names node_names;
 
 	struct cio2_sensor_ssdb ssdb;
 	struct acpi_pld_info *pld;
 
 	struct cio2_property_names prop_names;
 	struct property_entry ep_properties[5];
-	struct property_entry dev_properties[4];
+	struct property_entry dev_properties[5];
 	struct property_entry cio2_properties[3];
 	struct software_node_ref_args local_ref[1];
 	struct software_node_ref_args remote_ref[1];
+	struct software_node_ref_args vcm_ref[1];
 };
 
 struct cio2_bridge {