ALSA: ASoC: Add support for generic DAPM register modifier widget

This generic register modifier widget is for updating multiple codec
register bits at once when the widget changes its power state.

Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index f8223fa..b284953 100644 (file)
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -130,6 +130,13 @@
 {      .id = snd_soc_dapm_adc, .name = wname, .sname = stname, .reg = wreg, \
        .shift = wshift, .invert = winvert}
 
+/* generic register modifier widget */
+#define SND_SOC_DAPM_REG(wid, wname, wreg, wshift, wmask, won_val, woff_val) \
+{      .id = wid, .name = wname, .kcontrols = NULL, .num_kcontrols = 0, \
+       .reg = -((wreg) + 1), .shift = wshift, .mask = wmask, \
+       .on_val = won_val, .off_val = woff_val, .event = dapm_reg_event, \
+       .event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD}
+
 /* dapm kcontrol types */
 #define SOC_DAPM_SINGLE(xname, reg, shift, max, invert) \
 {      .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
@@ -227,6 +234,10 @@ int snd_soc_dapm_set_bias_level(struct snd_soc_device *socdev,
 /* dapm sys fs - used by the core */
 int snd_soc_dapm_sys_add(struct device *dev);
 
+/* event handler for register modifier widget - used by the soc-dapm */
+int dapm_reg_event(struct snd_soc_dapm_widget *w,
+                  struct snd_kcontrol *kcontrol, int event);
+
 /* dapm audio endpoint control */
 int snd_soc_dapm_set_endpoint(struct snd_soc_codec *codec,
        char *pin, int status);
@@ -298,6 +309,9 @@ struct snd_soc_dapm_widget {
        unsigned char shift;                    /* bits to shift */
        unsigned int saved_value;               /* widget saved value */
        unsigned int value;                             /* widget current value */
+       unsigned int mask;                      /* non-shifted mask */
+       unsigned int on_val;                    /* on state value */
+       unsigned int off_val;                   /* off state value */
        unsigned char power:1;                  /* block power status */
        unsigned char invert:1;                 /* invert the power bit */
        unsigned char active:1;                 /* active stream on DAC, ADC's */

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 728f3ac..2536382 100644 (file)
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -442,6 +442,25 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget)
        return con;
 }
 
+/*
+ * Handler for generic register modifier widget.
+ */
+int dapm_reg_event(struct snd_soc_dapm_widget *w,
+                  struct snd_kcontrol *kcontrol, int event)
+{
+       unsigned int val;
+
+       if (SND_SOC_DAPM_EVENT_ON(event))
+               val = w->on_val;
+       else
+               val = w->off_val;
+
+       snd_soc_update_bits(w->codec, -(w->reg + 1),
+                           w->mask << w->shift, val << w->shift);
+
+       return 0;
+}
+
 /*
  * Scan each dapm widget for complete audio path.
  * A complete path is a route that has valid endpoints i.e.:-