[PATCH 3/9] crypto: atmel-ecc: More helpful error messages

[Linus Walleij]

Report errors once when they happen on the I2C bus so we
get good information in cases such as when the wrong I2C
address is used.

Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
---
 drivers/crypto/atmel-ecc.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/crypto/atmel-ecc.c b/drivers/crypto/atmel-ecc.c
index 145ab3a39a56..214b0572bf8b 100644
--- a/drivers/crypto/atmel-ecc.c
+++ b/drivers/crypto/atmel-ecc.c
@@ -310,29 +310,41 @@ static int atmel_ecc_send_receive(struct i2c_client 
*client,
        mutex_lock(&i2c_priv->lock);
 
        ret = atmel_ecc_wakeup(client);
-       if (ret)
+       if (ret) {
+               dev_err(&client->dev, "wakeup failed\n");
                goto err;
+       }
 
        /* send the command */
        ret = i2c_master_send(client, (u8 *)cmd, cmd->count + WORD_ADDR_SIZE);
-       if (ret < 0)
+       if (ret < 0) {
+               dev_err(&client->dev, "command send failed\n");
                goto err;
+       }
 
        /* delay the appropriate amount of time for command to execute */
        msleep(cmd->msecs);
 
        /* receive the response */
        ret = i2c_master_recv(client, cmd->data, cmd->rxsize);
-       if (ret < 0)
+       if (ret < 0) {
+               dev_err(&client->dev, "getting response failed\n");
                goto err;
+       }
 
        /* put the device into low-power mode */
        ret = atmel_ecc_sleep(client);
-       if (ret < 0)
+       if (ret < 0) {
+               dev_err(&client->dev, "putting to sleep failed\n");
                goto err;
+       }
 
        mutex_unlock(&i2c_priv->lock);
-       return atmel_ecc_status(&client->dev, cmd->data);
+       ret = atmel_ecc_status(&client->dev, cmd->data);
+       if (ret < 0)
+               dev_err(&client->dev, "ECC status parse failed\n");
+
+       return ret;
 err:
        mutex_unlock(&i2c_priv->lock);
        return ret;
@@ -624,8 +636,11 @@ static int device_sanity_check(struct i2c_client *client)
        atmel_ecc_init_read_cmd(cmd);
 
        ret = atmel_ecc_send_receive(client, cmd);
-       if (ret)
+       if (ret) {
+               dev_err(&client->dev,
+                       "failed to send ECC init command\n");
                goto free_cmd;
+       }
 
        /*
         * It is vital that the Configuration, Data and OTP zones be locked
-- 
2.17.0