diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/crypto/atmel-sha204a.c | 45 |
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); } |