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@xxxxxxxxxx>
---
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
--
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