nvmem: add type attribute

Add a type attribute so userspace is able to know how the data is stored as
this can help taking the correct decision when selecting which device to
use. This will also help program display the proper warnings when burning
fuses for example.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 27f67dfa649d..d9fd11033c1c 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -28,6 +28,7 @@ struct nvmem_device {
 	size_t			size;
 	bool			read_only;
 	int			flags;
+	enum nvmem_type		type;
 	struct bin_attribute	eeprom;
 	struct device		*base_dev;
 	struct list_head	cells;
@@ -83,6 +84,21 @@ static int nvmem_reg_write(struct nvmem_device *nvmem, unsigned int offset,
 	return -EINVAL;
 }
 
+static ssize_t type_show(struct device *dev,
+			 struct device_attribute *attr, char *buf)
+{
+	struct nvmem_device *nvmem = to_nvmem_device(dev);
+
+	return sprintf(buf, "%s\n", nvmem_type_str[nvmem->type]);
+}
+
+static DEVICE_ATTR_RO(type);
+
+static struct attribute *nvmem_attrs[] = {
+	&dev_attr_type.attr,
+	NULL,
+};
+
 static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj,
 				    struct bin_attribute *attr,
 				    char *buf, loff_t pos, size_t count)
@@ -168,6 +184,7 @@ static struct bin_attribute *nvmem_bin_rw_attributes[] = {
 
 static const struct attribute_group nvmem_bin_rw_group = {
 	.bin_attrs	= nvmem_bin_rw_attributes,
+	.attrs		= nvmem_attrs,
 };
 
 static const struct attribute_group *nvmem_rw_dev_groups[] = {
@@ -191,6 +208,7 @@ static struct bin_attribute *nvmem_bin_ro_attributes[] = {
 
 static const struct attribute_group nvmem_bin_ro_group = {
 	.bin_attrs	= nvmem_bin_ro_attributes,
+	.attrs		= nvmem_attrs,
 };
 
 static const struct attribute_group *nvmem_ro_dev_groups[] = {
@@ -215,6 +233,7 @@ static struct bin_attribute *nvmem_bin_rw_root_attributes[] = {
 
 static const struct attribute_group nvmem_bin_rw_root_group = {
 	.bin_attrs	= nvmem_bin_rw_root_attributes,
+	.attrs		= nvmem_attrs,
 };
 
 static const struct attribute_group *nvmem_rw_root_dev_groups[] = {
@@ -238,6 +257,7 @@ static struct bin_attribute *nvmem_bin_ro_root_attributes[] = {
 
 static const struct attribute_group nvmem_bin_ro_root_group = {
 	.bin_attrs	= nvmem_bin_ro_root_attributes,
+	.attrs		= nvmem_attrs,
 };
 
 static const struct attribute_group *nvmem_ro_root_dev_groups[] = {
@@ -605,6 +625,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 	nvmem->dev.bus = &nvmem_bus_type;
 	nvmem->dev.parent = config->dev;
 	nvmem->priv = config->priv;
+	nvmem->type = config->type;
 	nvmem->reg_read = config->reg_read;
 	nvmem->reg_write = config->reg_write;
 	nvmem->dev.of_node = config->dev->of_node;