5 files changed, 56 insertions, 7 deletions

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index 8e94584b0d26..beb8b27d4621 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -235,6 +235,10 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
 
 void regmap_async_complete_cb(struct regmap_async *async, int ret);
 
+enum regmap_endian regmap_get_val_endian(struct device *dev,
+                                         const struct regmap_bus *bus,
+                                         const struct regmap_config *config);
+
 extern struct regcache_ops regcache_rbtree_ops;
 extern struct regcache_ops regcache_lzo_ops;
 extern struct regcache_ops regcache_flat_ops;
diff --git a/drivers/base/regmap/regmap-ac97.c b/drivers/base/regmap/regmap-ac97.c
index e4c45d2299c1..8d304e2a943d 100644
--- a/drivers/base/regmap/regmap-ac97.c
+++ b/drivers/base/regmap/regmap-ac97.c
@@ -74,8 +74,8 @@ static int regmap_ac97_reg_write(void *context, unsigned int reg,
 }
 
 static const struct regmap_bus ac97_regmap_bus = {
-                .reg_write = regmap_ac97_reg_write,
-                .reg_read = regmap_ac97_reg_read,
+        .reg_write = regmap_ac97_reg_write,
+        .reg_read = regmap_ac97_reg_read,
 };
 
 /**
diff --git a/drivers/base/regmap/regmap-i2c.c b/drivers/base/regmap/regmap-i2c.c
index 053150a7f9f2..4b76e33110a2 100644
--- a/drivers/base/regmap/regmap-i2c.c
+++ b/drivers/base/regmap/regmap-i2c.c
@@ -14,6 +14,7 @@
 #include <linux/i2c.h>
 #include <linux/module.h>
 
+#include "internal.h"
 
 static int regmap_smbus_byte_reg_read(void *context, unsigned int reg,
                                       unsigned int *val)
@@ -87,6 +88,42 @@ static struct regmap_bus regmap_smbus_word = {
         .reg_read = regmap_smbus_word_reg_read,
 };
 
+static int regmap_smbus_word_read_swapped(void *context, unsigned int reg,
+                                          unsigned int *val)
+{
+        struct device *dev = context;
+        struct i2c_client *i2c = to_i2c_client(dev);
+        int ret;
+
+        if (reg > 0xff)
+                return -EINVAL;
+
+        ret = i2c_smbus_read_word_swapped(i2c, reg);
+        if (ret < 0)
+                return ret;
+
+        *val = ret;
+
+        return 0;
+}
+
+static int regmap_smbus_word_write_swapped(void *context, unsigned int reg,
+                                           unsigned int val)
+{
+        struct device *dev = context;
+        struct i2c_client *i2c = to_i2c_client(dev);
+
+        if (val > 0xffff || reg > 0xff)
+                return -EINVAL;
+
+        return i2c_smbus_write_word_swapped(i2c, reg, val);
+}
+
+static struct regmap_bus regmap_smbus_word_swapped = {
+        .reg_write = regmap_smbus_word_write_swapped,
+        .reg_read = regmap_smbus_word_read_swapped,
+};
+
 static int regmap_i2c_write(void *context, const void *data, size_t count)
 {
         struct device *dev = context;
@@ -180,7 +217,14 @@ static const struct regmap_bus *regmap_get_i2c_bus(struct i2c_client *i2c,
         else if (config->val_bits == 16 && config->reg_bits == 8 &&
                  i2c_check_functionality(i2c->adapter,
                                          I2C_FUNC_SMBUS_WORD_DATA))
-                return &regmap_smbus_word;
+                switch (regmap_get_val_endian(&i2c->dev, NULL, config)) {
+                case REGMAP_ENDIAN_LITTLE:
+                        return &regmap_smbus_word;
+                case REGMAP_ENDIAN_BIG:
+                        return &regmap_smbus_word_swapped;
+                default:                /* everything else is not supported */
+                        break;
+                }
         else if (config->val_bits == 8 && config->reg_bits == 8 &&
                  i2c_check_functionality(i2c->adapter,
                                          I2C_FUNC_SMBUS_BYTE_DATA))
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index d2f8a818d200..f99b098ddabf 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -473,9 +473,9 @@ static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
         return REGMAP_ENDIAN_BIG;
 }
 
-static enum regmap_endian regmap_get_val_endian(struct device *dev,
-                                        const struct regmap_bus *bus,
-                                        const struct regmap_config *config)
+enum regmap_endian regmap_get_val_endian(struct device *dev,
+                                         const struct regmap_bus *bus,
+                                         const struct regmap_config *config)
 {
         struct device_node *np;
         enum regmap_endian endian;
@@ -513,6 +513,7 @@ static enum regmap_endian regmap_get_val_endian(struct device *dev,
         /* Use this if no other value was found */
         return REGMAP_ENDIAN_BIG;
 }
+EXPORT_SYMBOL_GPL(regmap_get_val_endian);
 
 /**
  * regmap_init(): Initialise register map
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 4419b99d8d6e..116655d92269 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -468,7 +468,7 @@ bool regmap_reg_in_ranges(unsigned int reg,
  *
  * @reg: Offset of the register within the regmap bank
  * @lsb: lsb of the register field.
- * @reg: msb of the register field.
+ * @msb: msb of the register field.
  * @id_size: port size if it has some ports
  * @id_offset: address offset for each ports
  */