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authorKristoffer KARLSSON <kristoffer.karlsson@stericsson.com>2012-04-20 11:32:44 +0200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-04-23 20:05:06 +0100
commitdd7b10b30c40dddb9750926d78cfe89c0cd8434d (patch)
tree84084ba083aa317576dd37d62070fd160c6e07de /sound/soc/soc-core.c
parent4183eed288f31c3b9142476915e842f879f36b8e (diff)
ASoC: core: Add strobe control
Added support for a control that strobes a bit in a register to high then back to low (or the inverse). This is typically useful for hardware that requires strobing a singe bit to trigger some functionality and where exposing the bit in a normal single control would require the user to first manually set then again unset the bit again for the strobe to trigger. Added convenience macro. SOC_SINGLE_STROBE Added accessor implementations. snd_soc_get_strobe snd_soc_put_strobe Signed-off-by: Kristoffer KARLSSON <kristoffer.karlsson@stericsson.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/soc-core.c')
-rw-r--r--sound/soc/soc-core.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 01bbd86cf270..666b81b400c2 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3010,6 +3010,69 @@ int snd_soc_put_xr_sx(struct snd_kcontrol *kcontrol,
EXPORT_SYMBOL_GPL(snd_soc_put_xr_sx);
/**
+ * snd_soc_get_strobe - strobe get callback
+ * @kcontrol: mixer control
+ * @ucontrol: control element information
+ *
+ * Callback get the value of a strobe mixer control.
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_get_strobe(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct soc_mixer_control *mc =
+ (struct soc_mixer_control *)kcontrol->private_value;
+ struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+ unsigned int reg = mc->reg;
+ unsigned int shift = mc->shift;
+ unsigned int mask = 1 << shift;
+ unsigned int invert = mc->invert != 0;
+ unsigned int val = snd_soc_read(codec, reg) & mask;
+
+ if (shift != 0 && val != 0)
+ val = val >> shift;
+ ucontrol->value.enumerated.item[0] = val ^ invert;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_get_strobe);
+
+/**
+ * snd_soc_put_strobe - strobe put callback
+ * @kcontrol: mixer control
+ * @ucontrol: control element information
+ *
+ * Callback strobe a register bit to high then low (or the inverse)
+ * in one pass of a single mixer enum control.
+ *
+ * Returns 1 for success.
+ */
+int snd_soc_put_strobe(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct soc_mixer_control *mc =
+ (struct soc_mixer_control *)kcontrol->private_value;
+ struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+ unsigned int reg = mc->reg;
+ unsigned int shift = mc->shift;
+ unsigned int mask = 1 << shift;
+ unsigned int invert = mc->invert != 0;
+ unsigned int strobe = ucontrol->value.enumerated.item[0] != 0;
+ unsigned int val1 = (strobe ^ invert) ? mask : 0;
+ unsigned int val2 = (strobe ^ invert) ? 0 : mask;
+ int err;
+
+ err = snd_soc_update_bits_locked(codec, reg, mask, val1);
+ if (err < 0)
+ return err;
+
+ err = snd_soc_update_bits_locked(codec, reg, mask, val2);
+ return err;
+}
+EXPORT_SYMBOL_GPL(snd_soc_put_strobe);
+
+/**
* snd_soc_dai_set_sysclk - configure DAI system or master clock.
* @dai: DAI
* @clk_id: DAI specific clock ID