regmap: Add support for 10/14 register formating

This patch adds support for 10 bits register, 14 bits value type register
formating. This is for example used by the Analog Devices AD5380.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index b96cf7202860..e533368e5598 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -90,6 +90,16 @@ static void regmap_format_7_9_write(struct regmap *map,
         *out = cpu_to_be16((reg << 9) | val);
 }
 
+static void regmap_format_10_14_write(struct regmap *map,
+                                    unsigned int reg, unsigned int val)
+{
+        u8 *out = map->work_buf;
+
+        out[2] = val;
+        out[1] = (val >> 8) | (reg << 6);
+        out[0] = reg >> 2;
+}
+
 static void regmap_format_8(void *buf, unsigned int val)
 {
         u8 *b = buf;
@@ -188,6 +198,16 @@ struct regmap *regmap_init(struct device *dev,
                 }
                 break;
 
+        case 10:
+                switch (config->val_bits) {
+                case 14:
+                        map->format.format_write = regmap_format_10_14_write;
+                        break;
+                default:
+                        goto err_map;
+                }
+                break;
+
         case 8:
                 map->format.format_reg = regmap_format_8;
                 break;