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ASoC: core: Add support for masking out parts of coefficient blocks

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Chip designers frequently include things like the enable and disable
controls for algorithms in the register blocks which also hold the
coefficients. Since it's desirable to split out the enable/disable
control from userspace the plain SND_SOC_BYTES() isn't optimal for
these devices.

Add a SND_SOC_BYTES_MASK() which allows a bitmask from the first word
of the block to be excluded from the control. This supports the needs
of devices I've looked at and lets us have a reasonably simple API.
Further controls can be added in future if that's needed.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
This commit is contained in:
Mark Brown 2012-02-17 16:20:33 -08:00
parent 71d08516b8
commit f831b055ec
2 changed files with 76 additions and 7 deletions
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9
include/sound/soc.h
View File

@ -192,6 +192,14 @@
((unsigned long)&(struct soc_bytes) \
{.base = xbase, .num_regs = xregs }) }
#define SND_SOC_BYTES_MASK(xname, xbase, xregs, xmask) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
.info = snd_soc_bytes_info, .get = snd_soc_bytes_get, \
.put = snd_soc_bytes_put, .private_value = \
((unsigned long)&(struct soc_bytes) \
{.base = xbase, .num_regs = xregs, \
.mask = xmask }) }
/*
* Simplified versions of above macros, declaring a struct and calculating
* ARRAY_SIZE internally
@ -904,6 +912,7 @@ struct soc_mixer_control {
struct soc_bytes {
int base;
int num_regs;
u32 mask;
};
/* enumerated kcontrol */

72
sound/soc/soc-core.c
View File

@ -2763,6 +2763,25 @@ int snd_soc_bytes_get(struct snd_kcontrol *kcontrol,
else
ret = -EINVAL;
/* Hide any masked bytes to ensure consistent data reporting */
if (ret == 0 && params->mask) {
switch (codec->val_bytes) {
case 1:
ucontrol->value.bytes.data[0] &= ~params->mask;
break;
case 2:
((u16 *)(&ucontrol->value.bytes.data))[0]
&= ~params->mask;
break;
case 4:
((u32 *)(&ucontrol->value.bytes.data))[0]
&= ~params->mask;
break;
default:
return -EINVAL;
}
}
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_bytes_get);
@ -2772,14 +2791,55 @@ int snd_soc_bytes_put(struct snd_kcontrol *kcontrol,
{
struct soc_bytes *params = (void *)kcontrol->private_value;
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
int ret;
int ret, len;
unsigned int val;
void *data;
if (!codec->using_regmap)
return -EINVAL;
data = ucontrol->value.bytes.data;
len = params->num_regs * codec->val_bytes;
/*
* If we've got a mask then we need to preserve the register
* bits. We shouldn't modify the incoming data so take a
* copy.
*/
if (params->mask) {
ret = regmap_read(codec->control_data, params->base, &val);
if (ret != 0)
return ret;
val &= params->mask;
data = kmemdup(data, len, GFP_KERNEL);
if (!data)
return -ENOMEM;
switch (codec->val_bytes) {
case 1:
((u8 *)data)[0] &= ~params->mask;
((u8 *)data)[0] |= val;
break;
case 2:
((u16 *)data)[0] &= cpu_to_be16(~params->mask);
((u16 *)data)[0] |= cpu_to_be16(val);
break;
case 4:
((u32 *)data)[0] &= cpu_to_be32(~params->mask);
((u32 *)data)[0] |= cpu_to_be32(val);
break;
default:
return -EINVAL;
}
}
if (codec->using_regmap)
ret = regmap_raw_write(codec->control_data, params->base,
ucontrol->value.bytes.data,
params->num_regs * codec->val_bytes);
else
ret = -EINVAL;
data, len);
if (params->mask)
kfree(data);
return ret;
}