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-rw-r--r--drivers/crypto/atmel-sha204a.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/crypto/atmel-sha204a.c b/drivers/crypto/atmel-sha204a.c
index 563a0493b492..24ffdf505023 100644
--- a/drivers/crypto/atmel-sha204a.c
+++ b/drivers/crypto/atmel-sha204a.c
@@ -114,6 +114,39 @@ static int atmel_sha204a_otp_read(struct i2c_client *client, u16 addr, u8 *otp)
return ret;
}
+static ssize_t otp_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ u16 addr;
+ u8 otp[OTP_ZONE_SIZE];
+ char *str = buf;
+ struct i2c_client *client = to_i2c_client(dev);
+ int i;
+
+ for (addr = 0; addr < OTP_ZONE_SIZE/4; addr++) {
+ if (atmel_sha204a_otp_read(client, addr, otp + addr * 4) < 0) {
+ dev_err(dev, "failed to read otp zone\n");
+ break;
+ }
+ }
+
+ for (i = 0; i < addr*2; i++)
+ str += sprintf(str, "%02X", otp[i]);
+ str += sprintf(str, "\n");
+ return str - buf;
+}
+static DEVICE_ATTR_RO(otp);
+
+static struct attribute *atmel_sha204a_attrs[] = {
+ &dev_attr_otp.attr,
+ NULL
+};
+
+static const struct attribute_group atmel_sha204a_groups = {
+ .name = "atsha204a",
+ .attrs = atmel_sha204a_attrs,
+};
+
static int atmel_sha204a_probe(struct i2c_client *client)
{
struct atmel_i2c_client_priv *i2c_priv;
@@ -134,6 +167,16 @@ static int atmel_sha204a_probe(struct i2c_client *client)
if (ret)
dev_warn(&client->dev, "failed to register RNG (%d)\n", ret);
+ /* otp read out */
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ return -ENODEV;
+
+ ret = sysfs_create_group(&client->dev.kobj, &atmel_sha204a_groups);
+ if (ret) {
+ dev_err(&client->dev, "failed to register sysfs entry\n");
+ return ret;
+ }
+
return ret;
}
@@ -146,6 +189,8 @@ static void atmel_sha204a_remove(struct i2c_client *client)
return;
}
+ sysfs_remove_group(&client->dev.kobj, &atmel_sha204a_groups);
+
kfree((void *)i2c_priv->hwrng.priv);
}