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Subject[PATCH V4 2/2] regmap: add regmap_bulk_write() for register write
Date
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>
---
Changes from V1:
- Change commit message.
- Byte swapping in input data packet.
Changes from V2:
- Remove formatting if val_byte is 1.
- Allocating proper size of memory for val_byte != 1
Changes from V3:
- Stylish fixes.
drivers/base/regmap/regmap.c | 62 ++++++++++++++++++++++++++++++++++++++++++
include/linux/regmap.h | 2 +
2 files changed, 64 insertions(+), 0 deletions(-)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index ba92217..39be1b3 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -482,6 +482,68 @@ 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 *wval;
+ /* 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);
+ } 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;
+ }
+ }
+ }
+
+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)
{
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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