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ASoC: soc-cache: Add support for default readable()/volatile() functions 

For common scenarios, device drivers can provide a table of all the
registers that are at least either readable/writable/volatile.  The idea
is that if a register lookup fails, all of its read/write/vol members
will be zero and will be treated as default.  This also reduces the
size of the register access array.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Dimitris Papastamos 2011-01-13 12:20:36 +00:00 committed by Mark Brown
parent 3e8e2cc45c
commit 066d16c3e8
2 changed files with 71 additions and 0 deletions
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22
include/sound/soc.h
View File

@ -276,6 +276,10 @@ int snd_soc_cache_write(struct snd_soc_codec *codec,
unsigned int reg, unsigned int value);
int snd_soc_cache_read(struct snd_soc_codec *codec,
unsigned int reg, unsigned int *value);
int snd_soc_default_volatile_register(struct snd_soc_codec *codec,
unsigned int reg);
int snd_soc_default_readable_register(struct snd_soc_codec *codec,
unsigned int reg);
/* Utility functions to get clock rates from various things */
int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots);
@ -366,6 +370,22 @@ int snd_soc_get_volsw_2r_sx(struct snd_kcontrol *kcontrol,
int snd_soc_put_volsw_2r_sx(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol);
/**
* struct snd_soc_reg_access - Describes whether a given register is
* readable, writable or volatile.
*
* @reg: the register number
* @read: whether this register is readable
* @write: whether this register is writable
* @vol: whether this register is volatile
*/
struct snd_soc_reg_access {
u16 reg;
u16 read;
u16 write;
u16 vol;
};
/**
* struct snd_soc_jack_pin - Describes a pin to update based on jack detection
*
@ -515,6 +535,8 @@ struct snd_soc_codec_driver {
short reg_cache_step;
short reg_word_size;
const void *reg_cache_default;
short reg_access_size;
const struct snd_soc_reg_access *reg_access_default;
enum snd_soc_compress_type compress_type;
/* codec bias level */

49
sound/soc/soc-cache.c
View File

@ -1603,3 +1603,52 @@ int snd_soc_cache_sync(struct snd_soc_codec *codec)
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_cache_sync);
static int snd_soc_get_reg_access_index(struct snd_soc_codec *codec,
unsigned int reg)
{
const struct snd_soc_codec_driver *codec_drv;
unsigned int min, max, index;
codec_drv = codec->driver;
min = 0;
max = codec_drv->reg_access_size - 1;
do {
index = (min + max) / 2;
if (codec_drv->reg_access_default[index].reg == reg)
return index;
if (codec_drv->reg_access_default[index].reg < reg)
min = index + 1;
else
max = index;
} while (min <= max);
return -1;
}
int snd_soc_default_volatile_register(struct snd_soc_codec *codec,
unsigned int reg)
{
int index;
if (reg >= codec->driver->reg_cache_size)
return 1;
index = snd_soc_get_reg_access_index(codec, reg);
if (index < 0)
return 0;
return codec->driver->reg_access_default[index].vol;
}
EXPORT_SYMBOL_GPL(snd_soc_default_volatile_register);
int snd_soc_default_readable_register(struct snd_soc_codec *codec,
unsigned int reg)
{
int index;
if (reg >= codec->driver->reg_cache_size)
return 1;
index = snd_soc_get_reg_access_index(codec, reg);
if (index < 0)
return 0;
return codec->driver->reg_access_default[index].read;
}
EXPORT_SYMBOL_GPL(snd_soc_default_readable_register);