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regmap: add regmap_bulk_write() for register write 

The bulk_write() supports the data transfer to multi
register which takes the data into cpu_endianness format
and does formatting of data to device format before
sending to device.
The transfer can be completed in single transfer or multiple
transfer based on data formatting.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Laxman Dewangan 2012-02-12 19:49:43 +05:30 committed by Mark Brown
parent c915719841
commit 8eaeb21925
2 changed files with 52 additions and 0 deletions
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50
drivers/base/regmap/regmap.c
View File

@ -473,6 +473,56 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
}
EXPORT_SYMBOL_GPL(regmap_raw_write);
/*
* regmap_bulk_write(): Write multiple registers to the device
*
* @map: Register map to write to
* @reg: First register to be write from
* @val: Block of data to be written, in native register size for device
* @val_count: Number of registers to write
*
* This function is intended to be used for writing a large block of
* data to be device either in single transfer or multiple transfer.
*
* A value of zero will be returned on success, a negative errno will
* be returned in error cases.
*/
int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
size_t val_count)
{
int ret = 0, i;
size_t val_bytes = map->format.val_bytes;
void *wval;
if (!map->format.parse_val)
return -EINVAL;
mutex_lock(&map->lock);
/* No formatting is require if val_byte is 1 */
if (val_bytes == 1) {
wval = (void *)val;
} else {
wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
if (!wval) {
ret = -ENOMEM;
dev_err(map->dev, "Error in memory allocation\n");
goto out;
}
for (i = 0; i < val_count * val_bytes; i += val_bytes)
map->format.parse_val(wval + i);
}
ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
if (val_bytes != 1)
kfree(wval);
out:
mutex_unlock(&map->lock);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_bulk_write);
static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
unsigned int val_len)
{

2
include/linux/regmap.h
View File

@ -133,6 +133,8 @@ int regmap_reinit_cache(struct regmap *map,
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
int regmap_raw_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len);
int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
size_t val_count);
int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val);
int regmap_raw_read(struct regmap *map, unsigned int reg,
void *val, size_t val_len);