diff options
Diffstat (limited to 'drivers/misc/eeprom/at24.c')
| -rw-r--r-- | drivers/misc/eeprom/at24.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 3cdf8e1ca0ad..051b14766ef9 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -593,6 +593,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) struct at24_data *at24; int err; unsigned i, num_addresses; + u8 test_byte; if (client->dev.platform_data) { chip = *(struct at24_platform_data *)client->dev.platform_data; @@ -743,6 +744,18 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) } } + i2c_set_clientdata(client, at24); + + /* + * Perform a one-byte test read to verify that the + * chip is functional. + */ + err = at24_read(at24, 0, &test_byte, 1); + if (err) { + err = -ENODEV; + goto err_clients; + } + at24->nvmem_config.name = dev_name(&client->dev); at24->nvmem_config.dev = &client->dev; at24->nvmem_config.read_only = !writable; @@ -764,8 +777,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) goto err_clients; } - i2c_set_clientdata(client, at24); - dev_info(&client->dev, "%u byte %s EEPROM, %s, %u bytes/write\n", chip.byte_len, client->name, writable ? "writable" : "read-only", at24->write_max); |