ASoC: Initial WM8903 microphone bias and short detection

Provide support for WM8903 microphone presence and short detection
using the GPIOs to route out a logic signal suitable for handling
using snd_soc_jack_add_gpios() on the processor GPIOs.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

diff --git a/include/sound/wm8903.h b/include/sound/wm8903.h
index 0045858..22b66a7 100644 (file)
--- a/include/sound/wm8903.h
+++ b/include/sound/wm8903.h
@@ -15,6 +15,28 @@
 #define WM8903_GPIO_NO_CONFIG 0x8000
 
 /*
+ * R6 (0x06) - Mic Bias Control 0
+ */
+#define WM8903_MICDET_HYST_ENA                  0x0080  /* MICDET_HYST_ENA */
+#define WM8903_MICDET_HYST_ENA_MASK             0x0080  /* MICDET_HYST_ENA */
+#define WM8903_MICDET_HYST_ENA_SHIFT                 7  /* MICDET_HYST_ENA */
+#define WM8903_MICDET_HYST_ENA_WIDTH                 1  /* MICDET_HYST_ENA */
+#define WM8903_MICDET_THR_MASK                  0x0070  /* MICDET_THR - [6:4] */
+#define WM8903_MICDET_THR_SHIFT                      4  /* MICDET_THR - [6:4] */
+#define WM8903_MICDET_THR_WIDTH                      3  /* MICDET_THR - [6:4] */
+#define WM8903_MICSHORT_THR_MASK                0x000C  /* MICSHORT_THR - [3:2] */
+#define WM8903_MICSHORT_THR_SHIFT                    2  /* MICSHORT_THR - [3:2] */
+#define WM8903_MICSHORT_THR_WIDTH                    2  /* MICSHORT_THR - [3:2] */
+#define WM8903_MICDET_ENA                       0x0002  /* MICDET_ENA */
+#define WM8903_MICDET_ENA_MASK                  0x0002  /* MICDET_ENA */
+#define WM8903_MICDET_ENA_SHIFT                      1  /* MICDET_ENA */
+#define WM8903_MICDET_ENA_WIDTH                      1  /* MICDET_ENA */
+#define WM8903_MICBIAS_ENA                      0x0001  /* MICBIAS_ENA */
+#define WM8903_MICBIAS_ENA_MASK                 0x0001  /* MICBIAS_ENA */
+#define WM8903_MICBIAS_ENA_SHIFT                     0  /* MICBIAS_ENA */
+#define WM8903_MICBIAS_ENA_WIDTH                     1  /* MICBIAS_ENA */
+
+/*
  * R116 (0x74) - GPIO Control 1
  */
 #define WM8903_GP1_FN_MASK                      0x1F00  /* GP1_FN - [12:8] */
@@ -210,6 +232,13 @@
 #define WM8903_GP5_DB_WIDTH                          1  /* GP5_DB */
 
 struct wm8903_platform_data {
+        /* Default register value for R6 (Mic bias), used to configure
+        * microphone detection.  In conjunction with gpio_cfg this
+        * can be used to route the microphone status signals out onto
+        * the GPIOs for use with snd_soc_jack_add_gpios().
+        */
+       u16 micdet_cfg;
+
        u32 gpio_cfg[5];       /* Default register values for GPIO pin mux */
 };
 

diff --git a/sound/soc/codecs/wm8903.c b/sound/soc/codecs/wm8903.c
index 36952d7..467e6c3 100644 (file)
--- a/sound/soc/codecs/wm8903.c
+++ b/sound/soc/codecs/wm8903.c
@@ -11,7 +11,6 @@
  *
  * TODO:
  *  - TDM mode configuration.
- *  - Mic detect.
  *  - Digital microphone support.
  *  - Interrupt support (mic detect and sequencer).
  */
@@ -246,10 +245,10 @@ static int wm8903_run_sequence(struct snd_soc_codec *codec, unsigned int start)
 
        BUG_ON(start > 48);
 
-       /* Enable the sequencer */
+       /* Enable the sequencer if it's not already on */
        reg[0] = snd_soc_read(codec, WM8903_WRITE_SEQUENCER_0);
-       reg[0] |= WM8903_WSEQ_ENA;
-       snd_soc_write(codec, WM8903_WRITE_SEQUENCER_0, reg[0]);
+       snd_soc_write(codec, WM8903_WRITE_SEQUENCER_0,
+                     reg[0] | WM8903_WSEQ_ENA);
 
        dev_dbg(&i2c->dev, "Starting sequence at %d\n", start);
 
@@ -268,9 +267,8 @@ static int wm8903_run_sequence(struct snd_soc_codec *codec, unsigned int start)
 
        dev_dbg(&i2c->dev, "Sequence complete\n");
 
-       /* Disable the sequencer again */
-       snd_soc_write(codec, WM8903_WRITE_SEQUENCER_0,
-                    reg[0] & ~WM8903_WSEQ_ENA);
+       /* Disable the sequencer again if we enabled it */
+       snd_soc_write(codec, WM8903_WRITE_SEQUENCER_0, reg[0]);
 
        return 0;
 }
@@ -1578,7 +1576,7 @@ static __devinit int wm8903_i2c_probe(struct i2c_client *i2c,
 
        wm8903_reset(codec);
 
-       /* Set up GPIOs */
+       /* Set up GPIOs and microphone detection */
        if (pdata) {
                for (i = 0; i < ARRAY_SIZE(pdata->gpio_cfg); i++) {
                        if (!pdata->gpio_cfg[i])
@@ -1587,6 +1585,16 @@ static __devinit int wm8903_i2c_probe(struct i2c_client *i2c,
                        snd_soc_write(codec, WM8903_GPIO_CONTROL_1 + i,
                                      pdata->gpio_cfg[i] & 0xffff);
                }
+
+               snd_soc_write(codec, WM8903_MIC_BIAS_CONTROL_0,
+                             pdata->micdet_cfg);
+
+               /* Microphone detection needs the WSEQ clock */
+               if (pdata->micdet_cfg)
+                       snd_soc_update_bits(codec, WM8903_WRITE_SEQUENCER_0,
+                                           WM8903_WSEQ_ENA, WM8903_WSEQ_ENA);
+
+               wm8903->mic_delay = pdata->micdet_delay;
        }
 
        /* power on device */

diff --git a/sound/soc/codecs/wm8903.h b/sound/soc/codecs/wm8903.h
index 551736c..8f19a24 100644 (file)
--- a/sound/soc/codecs/wm8903.h
+++ b/sound/soc/codecs/wm8903.h
@@ -173,28 +173,6 @@ extern struct snd_soc_codec_device soc_codec_dev_wm8903;
 #define WM8903_VMID_RES_5K                           4
 
 /*
- * R6 (0x06) - Mic Bias Control 0
- */
-#define WM8903_MICDET_HYST_ENA                  0x0080  /* MICDET_HYST_ENA */
-#define WM8903_MICDET_HYST_ENA_MASK             0x0080  /* MICDET_HYST_ENA */
-#define WM8903_MICDET_HYST_ENA_SHIFT                 7  /* MICDET_HYST_ENA */
-#define WM8903_MICDET_HYST_ENA_WIDTH                 1  /* MICDET_HYST_ENA */
-#define WM8903_MICDET_THR_MASK                  0x0070  /* MICDET_THR - [6:4] */
-#define WM8903_MICDET_THR_SHIFT                      4  /* MICDET_THR - [6:4] */
-#define WM8903_MICDET_THR_WIDTH                      3  /* MICDET_THR - [6:4] */
-#define WM8903_MICSHORT_THR_MASK                0x000C  /* MICSHORT_THR - [3:2] */
-#define WM8903_MICSHORT_THR_SHIFT                    2  /* MICSHORT_THR - [3:2] */
-#define WM8903_MICSHORT_THR_WIDTH                    2  /* MICSHORT_THR - [3:2] */
-#define WM8903_MICDET_ENA                       0x0002  /* MICDET_ENA */
-#define WM8903_MICDET_ENA_MASK                  0x0002  /* MICDET_ENA */
-#define WM8903_MICDET_ENA_SHIFT                      1  /* MICDET_ENA */
-#define WM8903_MICDET_ENA_WIDTH                      1  /* MICDET_ENA */
-#define WM8903_MICBIAS_ENA                      0x0001  /* MICBIAS_ENA */
-#define WM8903_MICBIAS_ENA_MASK                 0x0001  /* MICBIAS_ENA */
-#define WM8903_MICBIAS_ENA_SHIFT                     0  /* MICBIAS_ENA */
-#define WM8903_MICBIAS_ENA_WIDTH                     1  /* MICBIAS_ENA */
-
-/*
  * R8 (0x08) - Analogue DAC 0
  */
 #define WM8903_DACBIAS_SEL_MASK                 0x0018  /* DACBIAS_SEL - [4:3] */