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iio:tcs3472: Check for buffer enabled and locking 

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Peter Meerwald 2014-05-07 13:38:00 +01:00 committed by Jonathan Cameron
parent 4ff9f633c3
commit 2a58b4f88e
1 changed files with 10 additions and 1 deletions
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11
drivers/iio/light/tcs3472.c
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@ -52,6 +52,7 @@
struct tcs3472_data {
struct i2c_client *client;
struct mutex lock;
u8 enable;
u8 control;
u8 atime;
@ -116,10 +117,17 @@ static int tcs3472_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (iio_buffer_enabled(indio_dev))
return -EBUSY;
mutex_lock(&data->lock);
ret = tcs3472_req_data(data);
if (ret < 0)
if (ret < 0) {
mutex_unlock(&data->lock);
return ret;
}
ret = i2c_smbus_read_word_data(data->client, chan->address);
mutex_unlock(&data->lock);
if (ret < 0)
return ret;
*val = ret;
@ -255,6 +263,7 @@ static int tcs3472_probe(struct i2c_client *client,
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
mutex_init(&data->lock);
indio_dev->dev.parent = &client->dev;
indio_dev->info = &tcs3472_info;