qcacmn: Add support to retrieve SAR power limits

Recently change "qcacmn: Add SAR power limit configuration"
(Change-Id: I0a214a2af780e9dd8c381c4e9eaa7d8cab6ef853) added the
ability to dynamically configure Specific Absorption Rate (SAR) power
limits. Now add the ability to retrieve the current active power
limits.

Change-Id: I7a6071dee71300daa3a217780ff3523604a11795
CRs-Fixed: 2161451

wmi/inc/wmi_unified_api.h

@@ -1567,8 +1567,37 @@ QDF_STATUS wmi_unified_send_power_dbg_cmd(void *wmi_hdl,
 QDF_STATUS wmi_unified_send_multiple_vdev_restart_req_cmd(void *wmi_hdl,
 				struct multiple_vdev_restart_params *param);
 
+/**
+ * wmi_unified_send_sar_limit_cmd() - send sar limit cmd to fw
+ * @wmi_hdl: wmi handle
+ * @params: sar limit command params
+ *
+ * Return: QDF_STATUS_SUCCESS on success and QDF_STATUS_E_FAILURE for failure
+ */
 QDF_STATUS wmi_unified_send_sar_limit_cmd(void *wmi_hdl,
-				struct sar_limit_cmd_params *params);
+					  struct sar_limit_cmd_params *params);
+
+/**
+ * wmi_unified_get_sar_limit_cmd() - request current SAR limits from FW
+ * @wmi_hdl: wmi handle
+ *
+ * Return: QDF_STATUS_SUCCESS for success or error code
+ */
+QDF_STATUS wmi_unified_get_sar_limit_cmd(void *wmi_hdl);
+
+/**
+ * wmi_unified_extract_sar_limit_event() - extract SAR limits from FW event
+ * @wmi_hdl: wmi handle
+ * @evt_buf: event buffer received from firmware
+ * @event: SAR limit event which is to be populated by data extracted from
+ *         the @evt_buf buffer
+ *
+ * Return: QDF_STATUS_SUCCESS for success or error code
+ */
+QDF_STATUS wmi_unified_extract_sar_limit_event(void *wmi_hdl,
+					       uint8_t *evt_buf,
+					       struct sar_limit_event *event);
+
 QDF_STATUS wmi_unified_send_adapt_dwelltime_params_cmd(void *wmi_hdl,
 				   struct wmi_adaptive_dwelltime_params *
 				   wmi_param);

wmi/inc/wmi_unified_param.h

@@ -5664,6 +5664,7 @@ typedef enum {
 	wmi_dma_buf_release_event_id,
 	wmi_sap_obss_detection_report_event_id,
 	wmi_host_swfda_event_id,
+	wmi_sar_get_limits_event_id,
 
 	wmi_events_max,
 } wmi_conv_event_id;
@@ -7768,12 +7769,15 @@ typedef struct {
 
 #define MAX_SAR_LIMIT_ROWS_SUPPORTED 64
 /**
- * struct sar_limit_cmd_row - sar limts row
+ * struct sar_limit_cmd_row - sar limits row
  * @band_id: Optional param for frequency band
+ *           See %enum wmi_sar_band_id_flags for possible values
  * @chain_id: Optional param for antenna chain id
  * @mod_id: Optional param for modulation scheme
+ *          See %enum wmi_sar_mod_id_flags for possible values
  * @limit_value: Mandatory param providing power limits in steps of 0.5 dbm
  * @validity_bitmap: bitmap of valid optional params in sar_limit_cmd_row struct
+ *                   See WMI_SAR_*_VALID_MASK for possible values
  */
 struct sar_limit_cmd_row {
 	uint32_t band_id;
@@ -7784,8 +7788,9 @@ struct sar_limit_cmd_row {
 };
 
 /**
- * struct sar_limit_cmd_params - sar limts params
+ * struct sar_limit_cmd_params - sar limits params
  * @sar_enable: flag to enable SAR
+ *              See %enum wmi_sar_feature_state_flags for possible values
  * @num_limit_rows: number of items in sar_limits
  * @commit_limits: indicates firmware to start apply new SAR values
  * @sar_limit_row_list: pointer to array of sar limit rows
@@ -7797,6 +7802,38 @@ struct sar_limit_cmd_params {
 	struct sar_limit_cmd_row *sar_limit_row_list;
 };
 
+/**
+ * struct sar_limit_event_row - sar limits row
+ * @band_id: Frequency band.
+ *           See %enum wmi_sar_band_id_flags for possible values
+ * @chain_id: Chain id
+ * @mod_id: Modulation scheme
+ *          See %enum wmi_sar_mod_id_flags for possible values
+ * @limit_value: Power limits in steps of 0.5 dbm that is currently active for
+ *     the given @band_id, @chain_id, and @mod_id
+ */
+struct sar_limit_event_row {
+	uint32_t band_id;
+	uint32_t chain_id;
+	uint32_t mod_id;
+	uint32_t limit_value;
+};
+
+/**
+ * struct sar_limit_event - sar limits params
+ * @sar_enable: Current status of SAR enablement.
+ *              See %enum wmi_sar_feature_state_flags for possible values
+ * @num_limit_rows: number of items in sar_limits
+ * @sar_limit_row: array of sar limit rows. Only @num_limit_rows
+ *                 should be considered valid.
+ */
+struct sar_limit_event {
+	uint32_t sar_enable;
+	uint32_t num_limit_rows;
+	struct sar_limit_event_row
+			sar_limit_row[MAX_SAR_LIMIT_ROWS_SUPPORTED];
+};
+
 /*
  * struct wmi_peer_gid_userpos_list_event
  * @usr_list - User list

wmi/inc/wmi_unified_priv.h

@@ -1350,6 +1350,12 @@ QDF_STATUS (*extract_encrypt_decrypt_resp_event)(wmi_unified_t wmi_handle,
 QDF_STATUS (*send_sar_limit_cmd)(wmi_unified_t wmi_handle,
 				struct sar_limit_cmd_params *params);
 
+QDF_STATUS (*get_sar_limit_cmd)(wmi_unified_t wmi_handle);
+
+QDF_STATUS (*extract_sar_limit_event)(wmi_unified_t wmi_handle,
+				      uint8_t *evt_buf,
+				      struct sar_limit_event *event);
+
 QDF_STATUS (*send_peer_rx_reorder_queue_setup_cmd)(wmi_unified_t wmi_handle,
 		struct rx_reorder_queue_setup_params *param);
 

wmi/src/wmi_unified_api.c

@@ -6629,13 +6629,6 @@ QDF_STATUS wmi_unified_send_multiple_vdev_restart_req_cmd(void *wmi_hdl,
 	return QDF_STATUS_E_FAILURE;
 }
 
-/**
- * wmi_unified_send_sar_limit_cmd() - send sar limit cmd to fw
- * @wmi_hdl: wmi handle
- * @params: sar limit command params
- *
- * Return: QDF_STATUS_SUCCESS on success and QDF_STATUS_E_FAILURE for failure
- */
 QDF_STATUS wmi_unified_send_sar_limit_cmd(void *wmi_hdl,
 				struct sar_limit_cmd_params *params)
 {
@@ -6648,6 +6641,31 @@ QDF_STATUS wmi_unified_send_sar_limit_cmd(void *wmi_hdl,
 	return QDF_STATUS_E_FAILURE;
 }
 
+QDF_STATUS wmi_unified_get_sar_limit_cmd(void *wmi_hdl)
+{
+	wmi_unified_t wmi_handle = wmi_hdl;
+
+	if (wmi_handle->ops->get_sar_limit_cmd)
+		return wmi_handle->ops->get_sar_limit_cmd(wmi_handle);
+
+	return QDF_STATUS_E_FAILURE;
+}
+
+QDF_STATUS wmi_unified_extract_sar_limit_event(void *wmi_hdl,
+					       uint8_t *evt_buf,
+					       struct sar_limit_event *event)
+{
+	wmi_unified_t wmi_handle = wmi_hdl;
+
+	if (wmi_handle->ops->extract_sar_limit_event)
+		return wmi_handle->ops->extract_sar_limit_event(wmi_handle,
+								evt_buf,
+								event);
+
+	return QDF_STATUS_E_FAILURE;
+}
+
+
 #ifdef WLAN_FEATURE_DISA
 QDF_STATUS wmi_unified_encrypt_decrypt_send_cmd(void *wmi_hdl,
 				struct disa_encrypt_decrypt_req_params *params)

wmi/src/wmi_unified_tlv.c

@@ -5263,6 +5263,95 @@ end:
 	return qdf_status;
 }
 
+static QDF_STATUS get_sar_limit_cmd_tlv(wmi_unified_t wmi_handle)
+{
+	wmi_sar_get_limits_cmd_fixed_param *cmd;
+	wmi_buf_t wmi_buf;
+	uint32_t len;
+	QDF_STATUS status;
+
+	WMI_LOGD(FL("Enter"));
+
+	len = sizeof(*cmd);
+	wmi_buf = wmi_buf_alloc(wmi_handle, len);
+	if (!wmi_buf) {
+		WMI_LOGP(FL("failed to allocate memory for msg"));
+		return QDF_STATUS_E_NOMEM;
+	}
+
+	cmd = (wmi_sar_get_limits_cmd_fixed_param *)wmi_buf_data(wmi_buf);
+
+	WMITLV_SET_HDR(&cmd->tlv_header,
+		       WMITLV_TAG_STRUC_wmi_sar_get_limits_cmd_fixed_param,
+		       WMITLV_GET_STRUCT_TLVLEN
+				(wmi_sar_get_limits_cmd_fixed_param));
+
+	cmd->reserved = 0;
+
+	status = wmi_unified_cmd_send(wmi_handle, wmi_buf, len,
+				      WMI_SAR_GET_LIMITS_CMDID);
+	if (QDF_IS_STATUS_ERROR(status)) {
+		WMI_LOGE(FL("Failed to send get SAR limit cmd: %d"), status);
+		wmi_buf_free(wmi_buf);
+	}
+
+	WMI_LOGD(FL("Exit"));
+
+	return status;
+}
+
+static QDF_STATUS extract_sar_limit_event_tlv(wmi_unified_t wmi_handle,
+					      uint8_t *evt_buf,
+					      struct sar_limit_event *event)
+{
+	wmi_sar_get_limits_event_fixed_param *fixed_param;
+	WMI_SAR_GET_LIMITS_EVENTID_param_tlvs *param_buf;
+	wmi_sar_get_limit_event_row *row_in;
+	struct sar_limit_event_row *row_out;
+	uint32_t row;
+
+	if (!evt_buf) {
+		WMI_LOGE(FL("input event is NULL"));
+		return QDF_STATUS_E_INVAL;
+	}
+	if (!event) {
+		WMI_LOGE(FL("output event is NULL"));
+		return QDF_STATUS_E_INVAL;
+	}
+
+	param_buf = (WMI_SAR_GET_LIMITS_EVENTID_param_tlvs *)evt_buf;
+
+	fixed_param = param_buf->fixed_param;
+	if (!fixed_param) {
+		WMI_LOGE(FL("Invalid fixed param"));
+		return QDF_STATUS_E_INVAL;
+	}
+
+	event->sar_enable = fixed_param->sar_enable;
+	event->num_limit_rows = fixed_param->num_limit_rows;
+
+	if (event->num_limit_rows > MAX_SAR_LIMIT_ROWS_SUPPORTED) {
+		QDF_ASSERT(0);
+		WMI_LOGE(FL("Num rows %d exceeds max of %d"),
+			 event->num_limit_rows,
+			 MAX_SAR_LIMIT_ROWS_SUPPORTED);
+		event->num_limit_rows = MAX_SAR_LIMIT_ROWS_SUPPORTED;
+	}
+
+	row_in = param_buf->sar_get_limits;
+	row_out = &event->sar_limit_row[0];
+	for (row = 0; row < event->num_limit_rows; row++) {
+		row_out->band_id = row_in->band_id;
+		row_out->chain_id = row_in->chain_id;
+		row_out->mod_id = row_in->mod_id;
+		row_out->limit_value = row_in->limit_value;
+		row_out++;
+		row_in++;
+	}
+
+	return QDF_STATUS_SUCCESS;
+}
+
 #ifdef WLAN_FEATURE_DISA
 /**
  * send_encrypt_decrypt_send_cmd() - send encrypt/decrypt cmd to fw
@@ -21581,6 +21670,8 @@ struct wmi_ops tlv_ops =  {
 				extract_encrypt_decrypt_resp_event_tlv,
 #endif
 	.send_sar_limit_cmd = send_sar_limit_cmd_tlv,
+	.get_sar_limit_cmd = get_sar_limit_cmd_tlv,
+	.extract_sar_limit_event = extract_sar_limit_event_tlv,
 	.send_power_dbg_cmd = send_power_dbg_cmd_tlv,
 	.send_multiple_vdev_restart_req_cmd =
 				send_multiple_vdev_restart_req_cmd_tlv,
@@ -21953,6 +22044,7 @@ static void populate_tlv_events_id(uint32_t *event_ids)
 	event_ids[wmi_sap_obss_detection_report_event_id] =
 		WMI_SAP_OBSS_DETECTION_REPORT_EVENTID;
 	event_ids[wmi_host_swfda_event_id] = WMI_HOST_SWFDA_EVENTID;
+	event_ids[wmi_sar_get_limits_event_id] = WMI_SAR_GET_LIMITS_EVENTID;
 }
 
 #ifndef CONFIG_MCL