diff options
| -rw-r--r-- | drivers/base/regmap/regmap.c | 41 | ||||
| -rw-r--r-- | include/linux/regmap.h | 2 |
2 files changed, 43 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 7d689a15c50..c42ad69e527 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1439,6 +1439,47 @@ out: } EXPORT_SYMBOL_GPL(regmap_bulk_write); +/* + * regmap_multi_reg_write(): Write multiple registers to the device + * + * where the set of register are supplied in any order + * + * @map: Register map to write to + * @regs: Array of structures containing register,value to be written + * @num_regs: Number of registers to write + * + * This function is intended to be used for writing a large block of data + * atomically to the device in single transfer for those I2C client devices + * that implement this alternative block write mode. + * + * A value of zero will be returned on success, a negative errno will + * be returned in error cases. + */ +int regmap_multi_reg_write(struct regmap *map, struct reg_default *regs, + int num_regs) +{ + int ret = 0, i; + + for (i = 0; i < num_regs; i++) { + int reg = regs[i].reg; + if (reg % map->reg_stride) + return -EINVAL; + } + + map->lock(map->lock_arg); + + for (i = 0; i < num_regs; i++) { + ret = _regmap_write(map, regs[i].reg, regs[i].def); + if (ret != 0) + goto out; + } +out: + map->unlock(map->lock_arg); + + return ret; +} +EXPORT_SYMBOL_GPL(regmap_multi_reg_write); + /** * regmap_raw_write_async(): Write raw values to one or more registers * asynchronously diff --git a/include/linux/regmap.h b/include/linux/regmap.h index a10380bfbea..4b933a31f84 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -378,6 +378,8 @@ 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_multi_reg_write(struct regmap *map, struct reg_default *regs, + int num_regs); int regmap_raw_write_async(struct regmap *map, unsigned int reg, const void *val, size_t val_len); int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val); |