regmap: Add provisions to have user-defined write operation

This commit is a preparatory commit to provide "no-bus" configuration
option for regmap API. It adds necessary plumbing needed to have the
ability to provide user define register write function.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 54 insertions, 29 deletions

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index ceaefcfda8de..6845a077bd84 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -36,6 +36,10 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
 
 static int _regmap_bus_read(void *context, unsigned int reg,
                             unsigned int *val);
+static int _regmap_bus_formatted_write(void *context, unsigned int reg,
+                                       unsigned int val);
+static int _regmap_bus_raw_write(void *context, unsigned int reg,
+                                 unsigned int val);
 
 bool regmap_reg_in_ranges(unsigned int reg,
                           const struct regmap_range *ranges,
@@ -580,6 +584,11 @@ struct regmap *regmap_init(struct device *dev,
                 goto err_map;
         }
 
+        if (map->format.format_write)
+                map->reg_write = _regmap_bus_formatted_write;
+        else if (map->format.format_val)
+                map->reg_write = _regmap_bus_raw_write;
+
         map->range_tree = RB_ROOT;
         for (i = 0; i < config->num_ranges; i++) {
                 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
@@ -986,12 +995,54 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
         return ret;
 }
 
+static int _regmap_bus_formatted_write(void *context, unsigned int reg,
+                                       unsigned int val)
+{
+        int ret;
+        struct regmap_range_node *range;
+        struct regmap *map = context;
+
+        BUG_ON(!map->format.format_write);
+
+        range = _regmap_range_lookup(map, reg);
+        if (range) {
+                ret = _regmap_select_page(map, &reg, range, 1);
+                if (ret != 0)
+                        return ret;
+        }
+
+        map->format.format_write(map, reg, val);
+
+        trace_regmap_hw_write_start(map->dev, reg, 1);
+
+        ret = map->bus->write(map->bus_context, map->work_buf,
+                              map->format.buf_size);
+
+        trace_regmap_hw_write_done(map->dev, reg, 1);
+
+        return ret;
+}
+
+static int _regmap_bus_raw_write(void *context, unsigned int reg,
+                                 unsigned int val)
+{
+        struct regmap *map = context;
+
+        BUG_ON(!map->format.format_val);
+
+        map->format.format_val(map->work_buf + map->format.reg_bytes
+                               + map->format.pad_bytes, val, 0);
+        return _regmap_raw_write(map, reg,
+                                 map->work_buf +
+                                 map->format.reg_bytes +
+                                 map->format.pad_bytes,
+                                 map->format.val_bytes);
+}
+
 int _regmap_write(struct regmap *map, unsigned int reg,
                   unsigned int val)
 {
-        struct regmap_range_node *range;
         int ret;
-        BUG_ON(!map->format.format_write && !map->format.format_val);
 
         if (!map->cache_bypass && map->format.format_write) {
                 ret = regcache_write(map, reg, val);
@@ -1010,33 +1061,7 @@ int _regmap_write(struct regmap *map, unsigned int reg,
 
         trace_regmap_reg_write(map->dev, reg, val);
 
-        if (map->format.format_write) {
-                range = _regmap_range_lookup(map, reg);
-                if (range) {
-                        ret = _regmap_select_page(map, &reg, range, 1);
-                        if (ret != 0)
-                                return ret;
-                }
-
-                map->format.format_write(map, reg, val);
-
-                trace_regmap_hw_write_start(map->dev, reg, 1);
-
-                ret = map->bus->write(map->bus_context, map->work_buf,
-                                      map->format.buf_size);
-
-                trace_regmap_hw_write_done(map->dev, reg, 1);
-
-                return ret;
-        } else {
-                map->format.format_val(map->work_buf + map->format.reg_bytes
-                                       + map->format.pad_bytes, val, 0);
-                return _regmap_raw_write(map, reg,
-                                         map->work_buf +
-                                         map->format.reg_bytes +
-                                         map->format.pad_bytes,
-                                         map->format.val_bytes);
-        }
+        return map->reg_write(map, reg, val);
 }
 
 /**