Merge remote-tracking branch 'regmap/topic/multi' into regmap-next

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index c7111d0d16fb..9c021d9cace0 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1564,6 +1564,47 @@ 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