ASoC: Support configuration of WM8958 microphone bias analogue parameters

The WM8958 has a different microphone bias architecture to WM8994 so needs
different configuration to WM8994. Support this in platform data.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

include/linux/mfd/wm8994/pdata.h

@@ -108,13 +108,16 @@ struct wm8994_pdata {
 	 */
 	int micdet_irq;
 
-        /* Microphone biases: 0=0.9*AVDD1 1=0.65*AVVD1 */
+        /* WM8994 microphone biases: 0=0.9*AVDD1 1=0.65*AVVD1 */
         unsigned int micbias1_lvl:1;
         unsigned int micbias2_lvl:1;
 
-        /* Jack detect threashold levels, see datasheet for values */
+        /* WM8994 jack detect threashold levels, see datasheet for values */
         unsigned int jd_scthr:2;
         unsigned int jd_thr:2;
+
+	/* WM8958 microphone bias configuration */
+	int micbias[2];
 };
 
 #endif

include/linux/mfd/wm8994/registers.h

@@ -63,6 +63,8 @@
 #define WM8994_MICBIAS                          0x3A
 #define WM8994_LDO_1                            0x3B
 #define WM8994_LDO_2                            0x3C
+#define WM8958_MICBIAS1				0x3D
+#define WM8958_MICBIAS2				0x3E
 #define WM8994_CHARGE_PUMP_1                    0x4C
 #define WM8958_CHARGE_PUMP_2                    0x4D
 #define WM8994_CLASS_W_1                        0x51

sound/soc/codecs/wm8994.c

@@ -2855,6 +2855,13 @@ static void wm8994_handle_pdata(struct wm8994_priv *wm8994)
 	else
 		snd_soc_add_controls(wm8994->codec, wm8994_eq_controls,
 				     ARRAY_SIZE(wm8994_eq_controls));
+
+	for (i = 0; i < ARRAY_SIZE(pdata->micbias); i++) {
+		if (pdata->micbias[i]) {
+			snd_soc_write(codec, WM8958_MICBIAS1 + i,
+				pdata->micbias[i] & 0xffff);
+		}
+	}
 }
 
 /**