qcacld-3.0: Add PLD API to check DRV connection

Add PLD API in order to check if DRV (Direct Resource Vote) subsystem
is connected or not.

Change-Id: I3b600b0760e27c7111320088034c555aee4ff773
CRs-fixed: 2452039

core/pld/inc/pld_common.h

@@ -625,6 +625,7 @@ int pld_get_user_msi_assignment(struct device *dev, char *user_name,
 int pld_get_msi_irq(struct device *dev, unsigned int vector);
 void pld_get_msi_address(struct device *dev, uint32_t *msi_addr_low,
 			 uint32_t *msi_addr_high);
+int pld_is_drv_connected(struct device *dev);
 unsigned int pld_socinfo_get_serial_number(struct device *dev);
 int pld_is_qmi_disable(struct device *dev);
 int pld_is_fw_down(struct device *dev);

core/pld/src/pld_common.c

@@ -1551,6 +1551,36 @@ void pld_get_msi_address(struct device *dev, uint32_t *msi_addr_low,
 	}
 }
 
+/**
+ * pld_is_drv_connected() - Check if DRV subsystem is connected
+ * @dev: device structure
+ *
+ *  Return: 1 DRV is connected
+ *          0 DRV is not connected
+ *          Non zero failure code for errors
+ */
+int pld_is_drv_connected(struct device *dev)
+{
+	enum pld_bus_type type = pld_get_bus_type(dev);
+	int ret = 0;
+
+	switch (type) {
+	case PLD_BUS_TYPE_PCIE:
+		ret = pld_pcie_is_drv_connected(dev);
+		break;
+	case PLD_BUS_TYPE_SNOC:
+	case PLD_BUS_TYPE_SDIO:
+	case PLD_BUS_TYPE_USB:
+		break;
+	default:
+		pr_err("Invalid device type %d\n", type);
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
 /**
  * pld_socinfo_get_serial_number() - Get SOC serial number
  * @dev: device

core/pld/src/pld_pcie.h

@@ -316,6 +316,11 @@ static inline void pld_pcie_get_msi_address(struct device *dev,
 	return;
 }
 
+static inline int pld_pcie_is_drv_connected(struct device *dev)
+{
+	return 0;
+}
+
 static inline bool pld_pcie_platform_driver_support(void)
 {
 	return false;
@@ -474,6 +479,11 @@ static inline void pld_pcie_get_msi_address(struct device *dev,
 	cnss_get_msi_address(dev, msi_addr_low, msi_addr_high);
 }
 
+static inline int pld_pcie_is_drv_connected(struct device *dev)
+{
+	return cnss_pci_is_drv_connected(dev);
+}
+
 static inline bool pld_pcie_platform_driver_support(void)
 {
 	return true;