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Diffstat (limited to 'drivers/base/regmap/regmap.c')
-rw-r--r--drivers/base/regmap/regmap.c88
1 files changed, 74 insertions, 14 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 78f43fb2fe84..d2f8a818d200 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -15,6 +15,7 @@
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/err.h>
+#include <linux/of.h>
#include <linux/rbtree.h>
#include <linux/sched.h>
@@ -109,7 +110,7 @@ bool regmap_readable(struct regmap *map, unsigned int reg)
bool regmap_volatile(struct regmap *map, unsigned int reg)
{
- if (!regmap_readable(map, reg))
+ if (!map->format.format_write && !regmap_readable(map, reg))
return false;
if (map->volatile_reg)
@@ -448,6 +449,71 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
}
EXPORT_SYMBOL_GPL(regmap_attach_dev);
+static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
+ const struct regmap_config *config)
+{
+ enum regmap_endian endian;
+
+ /* Retrieve the endianness specification from the regmap config */
+ endian = config->reg_format_endian;
+
+ /* If the regmap config specified a non-default value, use that */
+ if (endian != REGMAP_ENDIAN_DEFAULT)
+ return endian;
+
+ /* Retrieve the endianness specification from the bus config */
+ if (bus && bus->reg_format_endian_default)
+ endian = bus->reg_format_endian_default;
+
+ /* If the bus specified a non-default value, use that */
+ if (endian != REGMAP_ENDIAN_DEFAULT)
+ return endian;
+
+ /* Use this if no other value was found */
+ return REGMAP_ENDIAN_BIG;
+}
+
+static enum regmap_endian regmap_get_val_endian(struct device *dev,
+ const struct regmap_bus *bus,
+ const struct regmap_config *config)
+{
+ struct device_node *np;
+ enum regmap_endian endian;
+
+ /* Retrieve the endianness specification from the regmap config */
+ endian = config->val_format_endian;
+
+ /* If the regmap config specified a non-default value, use that */
+ if (endian != REGMAP_ENDIAN_DEFAULT)
+ return endian;
+
+ /* If the dev and dev->of_node exist try to get endianness from DT */
+ if (dev && dev->of_node) {
+ np = dev->of_node;
+
+ /* Parse the device's DT node for an endianness specification */
+ if (of_property_read_bool(np, "big-endian"))
+ endian = REGMAP_ENDIAN_BIG;
+ else if (of_property_read_bool(np, "little-endian"))
+ endian = REGMAP_ENDIAN_LITTLE;
+
+ /* If the endianness was specified in DT, use that */
+ if (endian != REGMAP_ENDIAN_DEFAULT)
+ return endian;
+ }
+
+ /* Retrieve the endianness specification from the bus config */
+ if (bus && bus->val_format_endian_default)
+ endian = bus->val_format_endian_default;
+
+ /* If the bus specified a non-default value, use that */
+ if (endian != REGMAP_ENDIAN_DEFAULT)
+ return endian;
+
+ /* Use this if no other value was found */
+ return REGMAP_ENDIAN_BIG;
+}
+
/**
* regmap_init(): Initialise register map
*
@@ -551,17 +617,8 @@ struct regmap *regmap_init(struct device *dev,
map->reg_read = _regmap_bus_read;
}
- reg_endian = config->reg_format_endian;
- if (reg_endian == REGMAP_ENDIAN_DEFAULT)
- reg_endian = bus->reg_format_endian_default;
- if (reg_endian == REGMAP_ENDIAN_DEFAULT)
- reg_endian = REGMAP_ENDIAN_BIG;
-
- val_endian = config->val_format_endian;
- if (val_endian == REGMAP_ENDIAN_DEFAULT)
- val_endian = bus->val_format_endian_default;
- if (val_endian == REGMAP_ENDIAN_DEFAULT)
- val_endian = REGMAP_ENDIAN_BIG;
+ reg_endian = regmap_get_reg_endian(bus, config);
+ val_endian = regmap_get_val_endian(dev, bus, config);
switch (config->reg_bits + map->reg_shift) {
case 2:
@@ -1408,7 +1465,7 @@ int _regmap_write(struct regmap *map, unsigned int reg,
}
#ifdef LOG_DEVICE
- if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
+ if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
dev_info(map->dev, "%x <= %x\n", reg, val);
#endif
@@ -1659,6 +1716,9 @@ out:
} else {
void *wval;
+ if (!val_count)
+ return -EINVAL;
+
wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
if (!wval) {
dev_err(map->dev, "Error in memory allocation\n");
@@ -2058,7 +2118,7 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
ret = map->reg_read(context, reg, val);
if (ret == 0) {
#ifdef LOG_DEVICE
- if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
+ if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
dev_info(map->dev, "%x => %x\n", reg, *val);
#endif