iio: light: tcs3472: use iio helper function to guarantee direct mode
Replace the code that guarantees the device stays in direct mode with iio_device_claim_direct_mode() which does same. This allows removal of an unused lock in the device private global data. Also prevents a previous race condition when a buffer is enabled whilst a raw read is going on. Signed-off-by: Alison Schofield <amsfield22@gmail.com> Cc: Daniel Baluta <daniel.baluta@gmail.com> Acked-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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@ -52,7 +52,6 @@
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struct tcs3472_data {
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struct tcs3472_data {
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struct i2c_client *client;
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struct i2c_client *client;
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struct mutex lock;
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u8 enable;
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u8 enable;
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u8 control;
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u8 control;
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u8 atime;
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u8 atime;
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@ -117,17 +116,16 @@ static int tcs3472_read_raw(struct iio_dev *indio_dev,
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switch (mask) {
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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case IIO_CHAN_INFO_RAW:
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if (iio_buffer_enabled(indio_dev))
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ret = iio_device_claim_direct_mode(indio_dev);
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return -EBUSY;
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if (ret)
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return ret;
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mutex_lock(&data->lock);
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ret = tcs3472_req_data(data);
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ret = tcs3472_req_data(data);
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if (ret < 0) {
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if (ret < 0) {
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mutex_unlock(&data->lock);
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iio_device_release_direct_mode(indio_dev);
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return ret;
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return ret;
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}
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}
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ret = i2c_smbus_read_word_data(data->client, chan->address);
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ret = i2c_smbus_read_word_data(data->client, chan->address);
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mutex_unlock(&data->lock);
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iio_device_release_direct_mode(indio_dev);
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if (ret < 0)
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if (ret < 0)
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return ret;
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return ret;
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*val = ret;
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*val = ret;
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@ -263,7 +261,6 @@ static int tcs3472_probe(struct i2c_client *client,
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data = iio_priv(indio_dev);
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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data->client = client;
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mutex_init(&data->lock);
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indio_dev->dev.parent = &client->dev;
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &tcs3472_info;
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indio_dev->info = &tcs3472_info;
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