qcacmn: Add unregister API for direct buf ring

Add Unregister API to de-register and free resources in direct buf
module. Existing logic of freeing all resources as part of pdev destroy
does not take care of soc_start and soc_stop scenarios. Add this API to
enable modules to de-register as part of soc_stop and register during
start.

CRs-Fixed: 2385313
Change-Id: Ibe6f6bc5f4bd2acc5a9fe71eee09c151853073bc

spectral/dispatcher/inc/wlan_spectral_tgt_api.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2019 The Linux Foundation. All rights reserved.
  *
  *
  * Permission to use, copy, modify, and/or distribute this software for
@@ -232,7 +232,7 @@ tgt_spectral_process_report(struct wlan_objmgr_pdev *pdev,
 			    void *payload);
 
 /**
- * tgt_spectral_register_to_dbr() - Register to direct dma
+ * tgt_spectral_register_to_dbr() - Register to direct DMA
  * @pdev: Pointer to pdev object
  *
  * Return: QDF_STATUS
@@ -240,6 +240,15 @@ tgt_spectral_process_report(struct wlan_objmgr_pdev *pdev,
 QDF_STATUS
 tgt_spectral_register_to_dbr(struct wlan_objmgr_pdev *pdev);
 
+/**
+ * tgt_spectral_unregister_to_dbr() - Register to direct DMA
+ * @pdev: Pointer to pdev object
+ *
+ * Return: QDF_STATUS
+ */
+QDF_STATUS
+tgt_spectral_unregister_to_dbr(struct wlan_objmgr_pdev *pdev);
+
 /**
  * tgt_spectral_get_target_type() - Get target type
  * @psoc: Pointer to psoc object

spectral/dispatcher/inc/wlan_spectral_utils_api.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2019 The Linux Foundation. All rights reserved.
  *
  *
  * Permission to use, copy, modify, and/or distribute this software for
@@ -154,6 +154,29 @@ spectral_vdev_get_ch_width(struct wlan_objmgr_vdev *vdev);
  */
 QDF_STATUS spectral_pdev_open(struct wlan_objmgr_pdev *pdev);
 
+/**
+ * spectral_register_dbr() - register Spectral event handler with DDMA
+ * @pdev:  pointer to pdev object
+ *
+ * API to register event handler with Direct DMA
+ *
+ * Return: QDF_STATUS_SUCCESS upon successful registration,
+ *         QDF_STATUS_E_FAILURE upon failure
+ */
+
+QDF_STATUS spectral_register_dbr(struct wlan_objmgr_pdev *pdev);
+
+/**
+ * spectral_unregister_dbr() - unregister Spectral event handler with DDMA
+ * @pdev:  pointer to pdev object
+ *
+ * API to unregister event handler with Direct DMA
+ *
+ * Return: QDF_STATUS_SUCCESS upon successful unregistration,
+ *         QDF_STATUS_E_FAILURE upon failure
+ */
+QDF_STATUS spectral_unregister_dbr(struct wlan_objmgr_pdev *pdev);
+
 #ifdef DIRECT_BUF_RX_ENABLE
 /**
  * spectral_dbr_event_handler() - Spectral dbr event handler

spectral/dispatcher/src/wlan_spectral_tgt_api.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011,2017-2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2011,2017-2019 The Linux Foundation. All rights reserved.
  *
  *
  * Permission to use, copy, modify, and/or distribute this software for
@@ -296,10 +296,33 @@ tgt_spectral_register_to_dbr(struct wlan_objmgr_pdev *pdev)
 
 	return QDF_STATUS_SUCCESS;
 }
+
+QDF_STATUS
+tgt_spectral_unregister_to_dbr(struct wlan_objmgr_pdev *pdev)
+{
+	struct wlan_objmgr_psoc *psoc;
+	struct wlan_lmac_if_direct_buf_rx_tx_ops *dbr_tx_ops = NULL;
+
+	psoc = wlan_pdev_get_psoc(pdev);
+	dbr_tx_ops = &psoc->soc_cb.tx_ops.dbr_tx_ops;
+
+	if (tgt_spectral_get_target_type(psoc) == TARGET_TYPE_QCA8074)
+		if (dbr_tx_ops->direct_buf_rx_module_unregister)
+			return dbr_tx_ops->direct_buf_rx_module_unregister
+				(pdev, 0);
+
+	return QDF_STATUS_E_FAILURE;
+}
 #else
 QDF_STATUS
 tgt_spectral_register_to_dbr(struct wlan_objmgr_pdev *pdev)
 {
 	return QDF_STATUS_SUCCESS;
 }
+
+QDF_STATUS
+tgt_spectral_unregister_to_dbr(struct wlan_objmgr_pdev *pdev)
+{
+	return QDF_STATUS_SUCCESS;
+}
 #endif

spectral/dispatcher/src/wlan_spectral_utils_api.c

@@ -239,3 +239,21 @@ QDF_STATUS spectral_pdev_open(struct wlan_objmgr_pdev *pdev)
 	status = tgt_spectral_register_to_dbr(pdev);
 	return QDF_STATUS_SUCCESS;
 }
+
+QDF_STATUS spectral_register_dbr(struct wlan_objmgr_pdev *pdev)
+{
+	return tgt_spectral_register_to_dbr(pdev);
+}
+
+qdf_export_symbol(spectral_register_dbr);
+
+QDF_STATUS spectral_unregister_dbr(struct wlan_objmgr_pdev *pdev)
+{
+	QDF_STATUS status;
+
+	status = tgt_spectral_unregister_to_dbr(pdev);
+
+	return status;
+}
+
+qdf_export_symbol(spectral_unregister_dbr);