qcacmn: Add interface to write string of CFR stopping

Add a interface to write string of CFR stopping, and indicate to
userspace that CFR has stopped.

Change-Id: Ib1d63cb75cd311b367d5d8100c5c4eb92980392d
CRs-Fixed: 2659373

umac/cfr/core/inc/cfr_defs_i.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2019-2020 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -31,6 +31,8 @@
 #include <qdf_types.h>
 #include <wlan_cfr_utils_api.h>
 
+#define CFR_STOP_STR           "CFR-CAPTURE-STOPPED"
+
 /**
  * wlan_cfr_psoc_obj_create_handler() - psoc object create handler for cfr
  * @psoc - pointer to psoc object
@@ -130,4 +132,14 @@ cfr_streamfs_write(struct pdev_cfr *pa, const void *write_data,
 QDF_STATUS
 cfr_streamfs_flush(struct pdev_cfr *pa);
 
+/**
+ * cfr_stop_indication() - write cfr stop string
+ * @vdev - pointer to vdev object
+ *
+ * Write stop string and indicate to up layer.
+ *
+ * Return: status of write CFR stop string
+ */
+QDF_STATUS cfr_stop_indication(struct wlan_objmgr_vdev *vdev);
+
 #endif

umac/cfr/core/src/cfr_common.c

@@ -302,3 +302,25 @@ QDF_STATUS cfr_streamfs_flush(struct pdev_cfr *pa)
 
 	return QDF_STATUS_SUCCESS;
 }
+
+QDF_STATUS cfr_stop_indication(struct wlan_objmgr_vdev *vdev)
+{
+	struct pdev_cfr *pa;
+	uint32_t status;
+	struct wlan_objmgr_pdev *pdev;
+
+	pdev = wlan_vdev_get_pdev(vdev);
+	pa = wlan_objmgr_pdev_get_comp_private_obj(pdev, WLAN_UMAC_COMP_CFR);
+	if (!pa) {
+		cfr_err("pdev_cfr is NULL\n");
+		return QDF_STATUS_E_INVAL;
+	}
+
+	status = cfr_streamfs_write(pa, (const void *)CFR_STOP_STR,
+				    sizeof(CFR_STOP_STR));
+
+	status = cfr_streamfs_flush(pa);
+	cfr_debug("stop indication done");
+
+	return status;
+}

umac/cfr/dispatcher/inc/wlan_cfr_ucfg_api.h

@@ -96,6 +96,16 @@ int ucfg_cfr_set_timer(struct wlan_objmgr_pdev *pdev, uint32_t value);
  */
 int ucfg_cfr_get_timer(struct wlan_objmgr_pdev *pdev);
 
+/**
+ * ucfg_cfr_stop_indication() - User space API to write cfr stop string
+ * @vdev - pointer to vdev object
+ *
+ * Write stop string and indicate to up layer.
+ *
+ * Return: status of write CFR stop string
+ */
+QDF_STATUS ucfg_cfr_stop_indication(struct wlan_objmgr_vdev *vdev);
+
 #ifdef WLAN_ENH_CFR_ENABLE
 /* Channel capture recipe filters */
 enum capture_type {

umac/cfr/dispatcher/src/wlan_cfr_ucfg_api.c

@@ -311,6 +311,16 @@ int ucfg_cfr_list_peers(struct wlan_objmgr_pdev *pdev)
 	return 0;
 }
 
+QDF_STATUS ucfg_cfr_stop_indication(struct wlan_objmgr_vdev *vdev)
+{
+	if (!vdev) {
+		cfr_err("null vdev");
+		return QDF_STATUS_E_INVAL;
+	}
+
+	return cfr_stop_indication(vdev);
+}
+
 #ifdef WLAN_ENH_CFR_ENABLE
 
 static inline