diff options
| author | Dimitris Papastamos <dp@opensource.wolfsonmicro.com> | 2011-03-22 10:37:03 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-03-26 17:44:14 +0000 |
| commit | 5fb609d435f0679ed322ddeb1fdafe6142463fdf (patch) | |
| tree | c0da5a9fca23fab307305acf6be95272eb2e8c52 /sound/soc/soc-cache.c | |
| parent | f3594f5c5c489d159f6d487a889d9d68ca4c0123 (diff) | |
| download | linux-5fb609d435f0679ed322ddeb1fdafe6142463fdf.tar.gz | |
ASoC: soc-cache: Introduce raw bulk write support
As it has become more common to have to write firmware or similar large chunks of data to the hardware, add a function to perform raw bulk writes that bypass the cache. This only handles volatile registers as we should avoid getting out of sync with the actual cache. Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@ti.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/soc-cache.c')
| -rw-r--r-- | sound/soc/soc-cache.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c index 9f6737413a6e..8bcd4e1cee91 100644 --- a/sound/soc/soc-cache.c +++ b/sound/soc/soc-cache.c @@ -625,6 +625,44 @@ static int snd_soc_16_16_spi_write(void *control_data, const char *data, #define snd_soc_16_16_spi_write NULL #endif +/* Primitive bulk write support for soc-cache. The data pointed to by `data' needs + * to already be in the form the hardware expects including any leading register specific + * data. Any data written through this function will not go through the cache as it + * only handles writing to volatile or out of bounds registers. + */ +static int snd_soc_hw_bulk_write_raw(struct snd_soc_codec *codec, unsigned int reg, + const void *data, size_t len) +{ + int ret; + + /* Ensure that the base register is volatile. Subsequently + * any other register that is touched by this routine should be + * volatile as well to ensure that we don't get out of sync with + * the cache. + */ + if (!snd_soc_codec_volatile_register(codec, reg) + && reg < codec->driver->reg_cache_size) + return -EINVAL; + + switch (codec->control_type) { + case SND_SOC_I2C: + ret = i2c_master_send(codec->control_data, data, len); + break; + case SND_SOC_SPI: + ret = do_spi_write(codec->control_data, data, len); + break; + default: + BUG(); + } + + if (ret == len) + return 0; + if (ret < 0) + return ret; + else + return -EIO; +} + static struct { int addr_bits; int data_bits; @@ -708,6 +746,7 @@ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec, codec->write = io_types[i].write; codec->read = io_types[i].read; + codec->bulk_write_raw = snd_soc_hw_bulk_write_raw; switch (control) { case SND_SOC_CUSTOM: |