msm: camera: common: Partial Camera Support

This change creates a sysfs entry(subparts_info) which
has info about number of IFEs, IFE-LITEs, SFEs & CUSTOM,
whose values are populated in their respective drivers.
Also, validates whether a particular IFE, SFE and CUSTOM
is supported or not. Based on this, probe of IFE, SFE and
CUSTOM drivers will happen accordingly.

CRs-Fixed: 3482745
Change-Id: Iff6e79a7793b14b1f368f215020617f10dbd4bb5
Signed-off-by: Karthik Dillibabu <quic_kard@quicinc.com>

drivers/cam_cust/cam_custom_dev.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2019-2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/delay.h>
@@ -10,6 +11,7 @@
 #include <linux/iommu.h>
 #include <linux/timer.h>
 #include <linux/kernel.h>
+#include <dt-bindings/msm-camera.h>
 
 #include <media/cam_req_mgr.h>
 
@@ -23,6 +25,7 @@
 #include "camera_main.h"
 
 static struct cam_custom_dev g_custom_dev;
+static uint32_t g_num_custom_hws;
 
 static void cam_custom_dev_iommu_fault_handler(
 	struct cam_smmu_pf_info *pf_info)
@@ -117,6 +120,11 @@ static int cam_custom_component_bind(struct device *dev,
 	g_custom_dev.sd.internal_ops = &cam_custom_subdev_internal_ops;
 	g_custom_dev.sd.close_seq_prior = CAM_SD_CLOSE_HIGH_PRIORITY;
 
+	if (!cam_cpas_is_feature_supported(CAM_CPAS_CUSTOM_FUSE, BIT(0), NULL)) {
+		CAM_DBG(CAM_CUSTOM, "CUSTOM:0 is not supported");
+		goto err;
+	}
+
 	rc = cam_subdev_probe(&g_custom_dev.sd, pdev, CAM_CUSTOM_DEV_NAME,
 		CAM_CUSTOM_DEVICE_TYPE);
 	if (rc) {
@@ -167,6 +175,14 @@ err:
 	return rc;
 }
 
+void cam_custom_get_num_hws(uint32_t *custom_num)
+{
+	if (custom_num)
+		*custom_num = g_num_custom_hws;
+	else
+		CAM_ERR(CAM_CUSTOM, "Invalid argument, g_num_custom_hws: %u", g_num_custom_hws);
+}
+
 static void cam_custom_component_unbind(struct device *dev,
 	struct device *master_dev, void *data)
 {
@@ -204,6 +220,8 @@ static int cam_custom_dev_probe(struct platform_device *pdev)
 	int rc = 0;
 
 	CAM_DBG(CAM_CUSTOM, "Adding Custom HW component");
+	g_num_custom_hws++;
+
 	rc = component_add(&pdev->dev, &cam_custom_component_ops);
 	if (rc)
 		CAM_ERR(CAM_CUSTOM, "failed to add component rc: %d", rc);

drivers/cam_cust/cam_custom_hw_mgr/cam_custom_hw_mgr.c

@@ -150,6 +150,16 @@ enum cam_isp_resource_type
 	}
 }
 
+static void cam_custom_mgr_count_functional_hws(uint32_t num_custom_functional)
+{
+	int i;
+
+	for (i = 0; i < CAM_CUSTOM_CSID_HW_MAX; i++) {
+		if (g_custom_hw_mgr.custom_hw[i])
+			num_custom_functional++;
+	}
+}
+
 static int cam_custom_hw_mgr_deinit_hw_res(
 	struct cam_custom_hw_mgr_res *hw_mgr_res)
 {
@@ -1467,6 +1477,7 @@ int cam_custom_hw_mgr_init(struct device_node *of_node,
 {
 	int rc = 0;
 	int i, j;
+	uint32_t num_custom_available, num_custom_functional = 0;
 
 	memset(&g_custom_hw_mgr, 0, sizeof(g_custom_hw_mgr));
 	mutex_init(&g_custom_hw_mgr.ctx_mutex);
@@ -1545,6 +1556,13 @@ int cam_custom_hw_mgr_init(struct device_node *of_node,
 	if (iommu_hdl)
 		*iommu_hdl = g_custom_hw_mgr.img_iommu_hdl;
 
+	cam_custom_get_num_hws(&num_custom_available);
+	cam_custom_mgr_count_functional_hws(&num_custom_functional);
+	rc = cam_cpas_prepare_subpart_info(CAM_CUSTOM_HW_IDX, num_custom_available,
+		num_custom_functional);
+	if (rc)
+		CAM_ERR(CAM_CUSTOM, "Failed to populate num_custom, rc: %d", rc);
+
 	CAM_DBG(CAM_CUSTOM, "HW manager initialized");
 	return 0;
 }

drivers/cam_cust/cam_custom_hw_mgr/cam_custom_hw_mgr.h

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only
  *
  * Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #ifndef _CAM_CUSTOM_HW_MGR_H_
@@ -126,6 +127,16 @@ struct cam_custom_hw_mgr {
 	struct cam_custom_hw_mgr_ctx   ctx_pool[CAM_CTX_MAX];
 };
 
+/**
+ * cam_custom_get_num_hws()
+ *
+ * @brief : Populates number of custom.
+ *
+ * @num_custom : Fills number of custom hws in the address passed.
+ *
+ */
+void cam_custom_get_num_hws(uint32_t *num_custom);
+
 /**
  * cam_custom_hw_mgr_init()
  *