ssb: make code for antenna gain extraction more generic

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/ssb/pci.c

@@ -326,13 +326,13 @@ err_ctlreg:
 	return err;
 }
 
-static s8 r123_extract_antgain(u8 sprom_revision, const u16 *in,
-			       u16 mask, u16 shift)
+static s8 sprom_extract_antgain(u8 sprom_revision, const u16 *in, u16 offset,
+				u16 mask, u16 shift)
 {
 	u16 v;
 	u8 gain;
 
-	v = in[SPOFF(SSB_SPROM1_AGAIN)];
+	v = in[SPOFF(offset)];
 	gain = (v & mask) >> shift;
 	if (gain == 0xFF)
 		gain = 2; /* If unset use 2dBm */
@@ -416,12 +416,14 @@ static void sprom_extract_r123(struct ssb_sprom *out, const u16 *in)
 	SPEX(alpha2[1], SSB_SPROM1_CCODE, 0x00ff, 0);
 
 	/* Extract the antenna gain values. */
-	out->antenna_gain.a0 = r123_extract_antgain(out->revision, in,
-						    SSB_SPROM1_AGAIN_BG,
-						    SSB_SPROM1_AGAIN_BG_SHIFT);
-	out->antenna_gain.a1 = r123_extract_antgain(out->revision, in,
-						    SSB_SPROM1_AGAIN_A,
-						    SSB_SPROM1_AGAIN_A_SHIFT);
+	out->antenna_gain.a0 = sprom_extract_antgain(out->revision, in,
+						     SSB_SPROM1_AGAIN,
+						     SSB_SPROM1_AGAIN_BG,
+						     SSB_SPROM1_AGAIN_BG_SHIFT);
+	out->antenna_gain.a1 = sprom_extract_antgain(out->revision, in,
+						     SSB_SPROM1_AGAIN,
+						     SSB_SPROM1_AGAIN_A,
+						     SSB_SPROM1_AGAIN_A_SHIFT);
 	if (out->revision >= 2)
 		sprom_extract_r23(out, in);
 }