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>

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index 471eb90..51f0574 100644 (file)
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -75,6 +75,7 @@ struct regmap {
        const struct regmap_access_table *precious_table;
 
        int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
+       int (*reg_write)(void *context, unsigned int reg, unsigned int val);
 
        u8 read_flag_mask;
        u8 write_flag_mask;

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index ceaefcf..6845a07 100644 (file)
--- 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);
 }
 
 /**