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path: root/drivers/nvmem
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Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/core.c57
1 files changed, 55 insertions, 2 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index de14fae6f7f6..b03690bc8f09 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -161,6 +161,53 @@ static const struct attribute_group *nvmem_ro_dev_groups[] = {
NULL,
};
+/* default read/write permissions, root only */
+static struct bin_attribute bin_attr_rw_root_nvmem = {
+ .attr = {
+ .name = "nvmem",
+ .mode = S_IWUSR | S_IRUSR,
+ },
+ .read = bin_attr_nvmem_read,
+ .write = bin_attr_nvmem_write,
+};
+
+static struct bin_attribute *nvmem_bin_rw_root_attributes[] = {
+ &bin_attr_rw_root_nvmem,
+ NULL,
+};
+
+static const struct attribute_group nvmem_bin_rw_root_group = {
+ .bin_attrs = nvmem_bin_rw_root_attributes,
+};
+
+static const struct attribute_group *nvmem_rw_root_dev_groups[] = {
+ &nvmem_bin_rw_root_group,
+ NULL,
+};
+
+/* read only permission, root only */
+static struct bin_attribute bin_attr_ro_root_nvmem = {
+ .attr = {
+ .name = "nvmem",
+ .mode = S_IRUSR,
+ },
+ .read = bin_attr_nvmem_read,
+};
+
+static struct bin_attribute *nvmem_bin_ro_root_attributes[] = {
+ &bin_attr_ro_root_nvmem,
+ NULL,
+};
+
+static const struct attribute_group nvmem_bin_ro_root_group = {
+ .bin_attrs = nvmem_bin_ro_root_attributes,
+};
+
+static const struct attribute_group *nvmem_ro_root_dev_groups[] = {
+ &nvmem_bin_ro_root_group,
+ NULL,
+};
+
static void nvmem_release(struct device *dev)
{
struct nvmem_device *nvmem = to_nvmem_device(dev);
@@ -355,8 +402,14 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
nvmem->read_only = of_property_read_bool(np, "read-only") |
config->read_only;
- nvmem->dev.groups = nvmem->read_only ? nvmem_ro_dev_groups :
- nvmem_rw_dev_groups;
+ if (config->root_only)
+ nvmem->dev.groups = nvmem->read_only ?
+ nvmem_ro_root_dev_groups :
+ nvmem_rw_root_dev_groups;
+ else
+ nvmem->dev.groups = nvmem->read_only ?
+ nvmem_ro_dev_groups :
+ nvmem_rw_dev_groups;
device_initialize(&nvmem->dev);