Re: [PATCH] ASoC: dapm: Add support for multi register mux
From: Lars-Peter Clausen
Date: Thu Apr 03 2014 - 04:26:49 EST
On 04/03/2014 05:11 AM, Arun Shamanna Lakshmi wrote:
This looks essentially good to me. A few minor issues, once those are fixed
things should be good to go.
[...]
struct snd_soc_dapm_update {
struct snd_kcontrol *kcontrol;
- int reg;
- int mask;
- int val;
+ int reg[3];
+ int mask[3];
+ int val[3];
Make the 3 a define and check against it in the put handler.
+ int num_regs;
unsigned int
};
[...]
+/*
+ * Soc Enum Type
+ *
+ * @NONE: soc_enum type for SINGLE, DOUBLE or VIRTUAL mux
+ * @ONEHOT: soc_enum type for one hot encoding mux
+ */
This should be kernel doc style so
/**
* enum snd_soc_enum_type - Type of the ASoC enum control
* @SND_SOC_ENUM_NONE: ...
* ...
*/
+enum snd_soc_enum_type {
+ SND_SOC_ENUM_NONE = 0,
I'm not sure if NONE is the right term. Maybe BINARY is better.
+ SND_SOC_ENUM_ONEHOT = 1,
+};
+
[...]
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index c8a780d..19b004a 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -511,13 +511,26 @@ static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
const struct snd_kcontrol_new *kcontrol)
{
struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
- unsigned int val, item;
+ unsigned int val, item, bit_pos = -1;
default for bit_pos should probably be 0.
[...]
@@ -1575,8 +1588,12 @@ static void dapm_widget_update(struct snd_soc_card *card)
if (!w)
return;
- ret = soc_widget_update_bits_locked(w, update->reg, update->mask,
- update->val);
+ /* dapm update for multiple registers */
+ for (i = 0; i < update->num_regs; i++) {
+ ret |= soc_widget_update_bits_locked(w, update->reg[i],
+ update->mask[i], update->val[i]);
I'd prefer
ret = soc_widget_update_bits_locked(...);
if (ret < 0)
break;
+ }
+
if (ret < 0)
dev_err(w->dapm->dev, "ASoC: %s DAPM update failed: %d\n",
w->name, ret);
[...]
@@ -2984,6 +3002,112 @@ int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);
/**
+ * snd_soc_dapm_get_enum_onehot - dapm enumerated onehot mixer get callback
+ * @kcontrol: mixer control
+ * @ucontrol: control element information
+ *
+ * Callback to get the value of a dapm enumerated onehot encoded mixer control
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_get_enum_onehot(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_soc_dapm_kcontrol_codec(kcontrol);
+ struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+ unsigned int reg_val, val, bit_pos = -1, reg_idx;
Here as well, default for bit_pos should be 0.
+
+ for (reg_idx = 0; reg_idx < e->num_regs; reg_idx++) {
+ reg_val = snd_soc_read(codec, e->reg[reg_idx]);
+ val = reg_val & e->mask[reg_idx];
+ if (val != 0) {
+ bit_pos = __ffs(val) + (8 * codec->val_bytes * reg_idx);
+ break;
+ }
+ }
+
+ ucontrol->value.enumerated.item[0] =
+ snd_soc_enum_val_to_item(e, bit_pos);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_onehot);
+
+/**
+ * snd_soc_dapm_put_enum_onehot - dapm enumerated onehot mixer put callback
+ * @kcontrol: mixer control
+ * @ucontrol: control element information
+ *
+ * Callback to put the value of a dapm enumerated onehot encoded mixer control
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_put_enum_onehot(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_soc_dapm_kcontrol_codec(kcontrol);
+ struct snd_soc_card *card = codec->card;
+ struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+ unsigned int *item = ucontrol->value.enumerated.item;
+ unsigned int change = 0, reg_idx = 0, value, bit_pos;
+ struct snd_soc_dapm_update update;
+ int ret = 0, reg_val = 0, i, update_idx = 0;
+
+ if (item[0] >= e->items)
+ return -EINVAL;
+
+ value = snd_soc_enum_item_to_val(e, item[0]);
+
+ if (value >= 0) {
value is unsigned int, so this is never false.
+ /* get the register index and value to set */
+ reg_idx = value / (8 * codec->val_bytes);
+ bit_pos = value % (8 * codec->val_bytes);
+ reg_val = BIT(bit_pos);
+ }
+
+ for (i = 0; i < e->num_regs; i++) {
+ if (i == reg_idx) {
+ change = snd_soc_test_bits(codec, e->reg[i],
+ e->mask[i], reg_val);
change |=
+ /* set the selected register */
+ update.reg[e->num_regs - 1] = e->reg[reg_idx];
+ update.mask[e->num_regs - 1] = e->mask[reg_idx];
+ update.val[e->num_regs - 1] = reg_val;
+ } else {
+ /* accumulate the change to update the DAPM path
+ when none is selected */
+ change |= snd_soc_test_bits(codec, e->reg[i],
+ e->mask[i], 0);
+
+ /* clear the register when not selected */
+ update.reg[update_idx] = e->reg[i];
+ update.mask[update_idx] = e->mask[i];
+ update.val[update_idx++] = 0;
+ }
+ }
+
+ mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
+
+ if (change) {
+ update.kcontrol = kcontrol;
+ update.num_regs = 3;
Should be e->num_regs;
+ card->update = &update;
+
+ ret = soc_dapm_mux_update_power(card, kcontrol, item[0], e);
+
+ card->update = NULL;
+ }
+
--
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