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

[uclinux-h8/linux.git] / drivers / base / regmap / regmap.c

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 2f7c25c..7a3f535 100644 (file)
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -411,6 +411,26 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
                        if (!map->writeable_reg(map->dev, reg + i))
                                return -EINVAL;
 
+       if (!map->cache_bypass && map->format.parse_val) {
+               unsigned int ival;
+               int val_bytes = map->format.val_bytes;
+               for (i = 0; i < val_len / val_bytes; i++) {
+                       memcpy(map->work_buf, val + (i * val_bytes), val_bytes);
+                       ival = map->format.parse_val(map->work_buf);
+                       ret = regcache_write(map, reg + i, ival);
+                       if (ret) {
+                               dev_err(map->dev,
+                                  "Error in caching of register: %u ret: %d\n",
+                                       reg + i, ret);
+                               return ret;
+                       }
+               }
+               if (map->cache_only) {
+                       map->cache_dirty = true;
+                       return 0;
+               }
+       }
+
        map->format.format_reg(map->work_buf, reg);
 
        u8[0] |= map->write_flag_mask;
@@ -461,7 +481,7 @@ int _regmap_write(struct regmap *map, unsigned int reg,
        int ret;
        BUG_ON(!map->format.format_write && !map->format.format_val);
 
-       if (!map->cache_bypass) {
+       if (!map->cache_bypass && map->format.format_write) {
                ret = regcache_write(map, reg, val);
                if (ret != 0)
                        return ret;
@@ -538,12 +558,8 @@ EXPORT_SYMBOL_GPL(regmap_write);
 int regmap_raw_write(struct regmap *map, unsigned int reg,
                     const void *val, size_t val_len)
 {
-       size_t val_count = val_len / map->format.val_bytes;
        int ret;
 
-       WARN_ON(!regmap_volatile_range(map, reg, val_count) &&
-               map->cache_type != REGCACHE_NONE);
-
        mutex_lock(&map->lock);
 
        ret = _regmap_raw_write(map, reg, val, val_len);
@@ -554,6 +570,56 @@ 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)
 {