gsm/utils: Adding conversion of "mobile power class" to dBm

Written-by: Andreas Eversberg <jolly@eversberg.eu>
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

diff --git a/include/osmocom/gsm/gsm_utils.h b/include/osmocom/gsm/gsm_utils.h
index a0ef3c4..405dfe3 100644 (file)
--- a/include/osmocom/gsm/gsm_utils.h
+++ b/include/osmocom/gsm/gsm_utils.h
@@ -59,6 +59,8 @@ enum gsm_band gsm_band_parse(const char *mhz);
 int gsm_7bit_decode(char *decoded, const uint8_t *user_data, uint8_t length);
 int gsm_7bit_encode(uint8_t *result, const char *data);
 
+unsigned int ms_class_gmsk_dbm(enum gsm_band band, int class);
+
 int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm);
 int ms_pwr_dbm(enum gsm_band band, uint8_t lvl);
 

diff --git a/src/gsm/gsm_utils.c b/src/gsm/gsm_utils.c
index 377705d..5da713c 100644 (file)
--- a/src/gsm/gsm_utils.c
+++ b/src/gsm/gsm_utils.c
@@ -171,6 +171,47 @@ int gsm_7bit_encode(uint8_t *result, const char *data)
        return z;
 }
 
+/* convert power class to dBm according to GSM TS 05.05 */
+unsigned int ms_class_gmsk_dbm(enum gsm_band band, int class)
+{
+       switch (band) {
+       case GSM_BAND_450:
+       case GSM_BAND_480:
+       case GSM_BAND_750:
+       case GSM_BAND_900:
+       case GSM_BAND_810:
+       case GSM_BAND_850:
+               if (class == 1)
+                       return 43; /* 20W */
+               if (class == 2)
+                       return 39; /* 8W */
+               if (class == 3)
+                       return 37; /* 5W */
+               if (class == 4)
+                       return 33; /* 2W */
+               if (class == 5)
+                       return 29; /* 0.8W */
+               break;
+       case GSM_BAND_1800:
+               if (class == 1)
+                       return 30; /* 1W */
+               if (class == 2)
+                       return 24; /* 0.25W */
+               if (class == 3)
+                       return 36; /* 4W */
+               break;
+       case GSM_BAND_1900:
+               if (class == 1)
+                       return 30; /* 1W */
+               if (class == 2)
+                       return 24; /* 0.25W */
+               if (class == 3)
+                       return 33; /* 2W */
+               break;
+       }
+       return -EINVAL;
+}
+
 /* determine power control level for given dBm value, as indicated
  * by the tables in chapter 4.1.1 of GSM TS 05.05 */
 int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm)