参照元†
- struct snd_kcontrol *kcontrol
- struct snd_ctl_elem_value *ucontrol
返り値†
/**
* snd_soc_put_volsw - single mixer put callback
* @kcontrol: mixer control
* @ucontrol: control element information
*
* Callback to set the value of a single mixer control, or a double mixer
* control that spans 2 registers.
*
* Returns 0 for success.
*/
int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
struct soc_mixer_control *mc =
(struct soc_mixer_control *)kcontrol->private_value;
unsigned int reg = mc->reg;
unsigned int reg2 = mc->rreg;
unsigned int shift = mc->shift;
unsigned int rshift = mc->rshift;
int max = mc->max;
int min = mc->min;
unsigned int sign_bit = mc->sign_bit;
unsigned int mask = (1 << fls(max)) - 1;
unsigned int invert = mc->invert;
int err;
bool type_2r = false;
unsigned int val2 = 0;
unsigned int val, val_mask;
if (sign_bit)
mask = BIT(sign_bit + 1) - 1;
val = ((ucontrol->value.integer.value[0] + min) & mask);
if (invert)
val = max - val;
val_mask = mask << shift;
val = val << shift;
if (snd_soc_volsw_is_stereo(mc)) {
val2 = ((ucontrol->value.integer.value[1] + min) & mask);
if (invert)
val2 = max - val2;
if (reg == reg2) {
val_mask |= mask << rshift;
val |= val2 << rshift;
} else {
val2 = val2 << shift;
type_2r = true;
}
}
err = snd_soc_component_update_bits(component, reg, val_mask, val);
if (err < 0)
return err;
if (type_2r)
err = snd_soc_component_update_bits(component, reg2, val_mask,
val2);
return err;
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw);
コメント†