regmap: add regmap_bulk_write() for register write
Laxman Dewangan [Sun, 12 Feb 2012 14:19:43 +0000 (19:19 +0530)]
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>
(cherry picked from commit 8eaeb21925563075ae036c2e5ba8d041b70e18fa)

Change-Id: Id97fbcfa0ed7d00d97dc3ab89fdb2b025850c9b1
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/87591

Rebase-Id: R5a91fc79b5e5e36c2c5d41fc445f2f12140d605d

drivers/base/regmap/regmap.c
include/linux/regmap.h

index c145884..158eb1b 100644 (file)
@@ -544,6 +544,56 @@ 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)
 {
index 5d26599..7cb21e8 100644 (file)
@@ -143,6 +143,8 @@ 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);