[osmo-bts PATCH 3/3 v5] main: Added support for changing the max_power_red in sbts2050

[Alvaro Neira Ayuso]

From: Álvaro Neira Ayuso <anayuso at sysmocom.de>

Added functions for changing the max_power_red in case of we receive
a Failure Event report from the manager. The sbts2050 change the
max_power_red to the value that we have configured in the manager
and the sbts2050 restore this value to the initial value if the bts
don't receive another Failure Event report in the same time that we
check the temperature in the manager.

Signed-off-by: Alvaro Neira Ayuso <anayuso at sysmocom.de>
---
[changed in v5]
* Added the function for updating the power transmitter
* Changed the transmitter reduce power for using a relative value and not a
  absolute value.

 src/osmo-bts-sysmo/main.c |   79 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/src/osmo-bts-sysmo/main.c b/src/osmo-bts-sysmo/main.c
index 11e1878..3f2a20d 100644
--- a/src/osmo-bts-sysmo/main.c
+++ b/src/osmo-bts-sysmo/main.c
@@ -39,6 +39,7 @@
 #include <osmocom/vty/telnet_interface.h>
 #include <osmocom/vty/logging.h>
 #include <osmocom/gsm/protocol/ipaccess.h>
+#include <osmocom/gsm/abis_nm.h>
 
 #include <osmo-bts/gsm_data.h>
 #include <osmo-bts/logging.h>
@@ -53,11 +54,14 @@
 
 #define SYSMOBTS_RF_LOCK_PATH	"/var/lock/bts_rf_lock"
 
+#define TEMP_TIMER_SECS		((6 * 3600) + 1)
+
 #include "utils.h"
 #include "eeprom.h"
 #include "l1_if.h"
 #include "hw_misc.h"
 #include "btsconfig.h"
+#include <misc/sysmobts_misc.h>
 
 /* FIXME: read from real hardware */
 const uint8_t abis_mac[6] = { 0,1,2,3,4,5 };
@@ -295,6 +299,73 @@ static int write_pid_file(char *procname)
 	return 0;
 }
 
+static int reduce_max_power;
+static int status_change_power_red;
+
+enum {
+	SBTS2050_DISABLE_CHANGE_POWER = 0,
+	SBTS2050_ENABLE_CHANGE_POWER,
+};
+
+#define oml_tlv_parse(dec, buf, len)	\
+	tlv_parse(dec, &abis_nm_att_tlvdef, buf, len, 0, 0)
+
+/* size of the struct plus 1 Bytes of tag and 2 Bytes for the length */
+#define TLV_ADD_INFO_LEN	(sizeof(struct sbts2050_config_info) + 3)
+
+/**********************************************************************
+ *  Function for change the transmitter power
+ *********************************************************************/
+static void update_transmiter_power(struct gsm_bts_trx *trx, int reduce_power)
+{
+	struct femtol1_hdl *fl1h = trx_femtol1_hdl(trx);
+	int power_transmitter = trx->nominal_power - trx->max_power_red;
+
+	if (fl1h->hLayer1)
+		l1if_set_txpower(fl1h, power_transmitter - reduce_power);
+}
+
+static struct osmo_timer_list power_timer;
+static void change_transmitter_power_cb(void *data)
+{
+	struct gsm_bts *bts = data;
+	struct gsm_bts_trx *trx = bts->c0;
+
+	if (status_change_power_red == SBTS2050_ENABLE_CHANGE_POWER) {
+		update_transmiter_power(trx, reduce_max_power);
+		status_change_power_red = SBTS2050_DISABLE_CHANGE_POWER;
+		osmo_timer_schedule(&power_timer, TEMP_TIMER_SECS, 0);
+	} else if (status_change_power_red == SBTS2050_DISABLE_CHANGE_POWER)
+		update_transmiter_power(trx, 0);
+}
+
+/**********************************************************************
+ *  Function for take the power that we have configured for
+ *  reduce the transmitter power
+ *********************************************************************/
+static int take_max_power_red(struct msgb *msg)
+{
+	struct sbts2050_config_info *config_info;
+	struct tlv_parsed tlv_out;
+	int rc;
+
+	rc = oml_tlv_parse(&tlv_out, msg->tail - TLV_ADD_INFO_LEN,
+			   TLV_ADD_INFO_LEN);
+
+	if (rc < 0)
+		return -1;
+
+	config_info =
+	    (struct sbts2050_config_info *) TLVP_VAL(&tlv_out, NM_ATT_ADD_INFO);
+
+	reduce_max_power = config_info->reduce_max_power;
+
+	status_change_power_red = SBTS2050_ENABLE_CHANGE_POWER;
+	change_transmitter_power_cb(bts);
+
+	return 0;
+}
+
 /**********************************************************************
  *  Function for checking that the OML msg received is well-formed
  *********************************************************************/
@@ -405,6 +476,11 @@ static int read_sock(struct osmo_fd *fd, unsigned int what)
 		goto err;
 	}
 
+	if (take_max_power_red(msg) < 0) {
+		LOGP(DL1C, LOGL_ERROR, "Add_info Malformed message\n");
+		goto err;
+	}
+
 	mo = &bts->mo;
 	msg->trx = mo->bts->c0;
 
@@ -459,6 +535,9 @@ static int oml_sock_unix_init(struct osmo_fd *accept, struct osmo_fd *read)
 	read->fd = -1;
 	accept->data = read;
 
+	power_timer.cb = change_transmitter_power_cb;
+	power_timer.data = bts;
+
 	rc = osmo_sock_unix_init_ofd(accept, SOCK_SEQPACKET, 0, SOCKET_PATH,
 				     OSMO_SOCK_F_BIND | OSMO_SOCK_F_NONBLOCK);
 	return rc;
-- 
1.7.10.4