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 <[email protected]> --- Changes from V1: - Change commit message. - Byte swapping in input data packet. drivers/base/regmap/regmap.c | 53 ++++++++++++++++++++++++++++++++++++++++++ include/linux/regmap.h | 2 + 2 files changed, 55 insertions(+), 0 deletions(-) diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index b4f4455..875e381 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -482,6 +482,59 @@ 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; + unsigned int ival; + size_t val_bytes = map->format.val_bytes; + + mutex_lock(&map->lock); + + if (map->format.parse_val) { + void *wptr = kmemdup(val, val_count, GFP_KERNEL); + if (!wptr) { + mutex_unlock(&map->lock); + dev_err(map->dev, "Error in memory allocation\n"); + return -ENOMEM; + } + for (i = 0; i < val_count * val_bytes; i += val_bytes) + map->format.parse_val(wptr + i); + ret = _regmap_raw_write(map, reg, wptr, val_bytes * val_count); + + kfree(wptr); + } else { + for (i = 0; i < val_count; i++) { + memcpy(&ival, val + (i * val_bytes), val_bytes); + ret = _regmap_write(map, reg + i, ival); + if (ret) { + dev_err(map->dev, + "Error in register %u write, ret %d\n", + reg + i, ret); + break; + } + } + } + + 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) { diff --git a/include/linux/regmap.h b/include/linux/regmap.h index a6ed6e6..0925e24 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -135,6 +135,8 @@ 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); -- 1.7.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
