Handle easy reads by using bus->reg_read(). Return with an error value
if a read is requested that can not be handled with reg_read().
Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
---
drivers/base/regmap/regmap.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 87f15fb60bc5..3b663350c573 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2071,6 +2071,21 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
WARN_ON(!map->bus);
+ /*
+ * There are busses that do not have a read function as it is optional.
+ * Use their reg_read function instead if the requested number of bytes
+ * is correct.
+ */
+ if (!map->bus->read) {
+ /*
+ * bus_reg_read() does not support reading values that are not
+ * exactly the size of format.val_bytes
+ */
+ if (val_len != map->format.val_bytes)
+ return -EINVAL;
+ return _regmap_bus_reg_read(map, reg, val);
+ }
+
range = _regmap_range_lookup(map, reg);
if (range) {
ret = _regmap_select_page(map, ®, range,
--
2.4.6
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