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| author | Peter Meerwald <p.meerwald@bct-electronic.com> | 2014-05-07 16:38:00 +0400 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2014-07-07 11:59:16 +0400 |
| commit | 2a58b4f88e3e51619916e9d090cbd1bb8d12b632 (patch) | |
| tree | bb7b30607fab6a1968e142486ae0c13acf84a150 | |
| parent | 4ff9f633c35e2d94eb92f92c48ae0d9172242889 (diff) | |
| download | linux-2a58b4f88e3e51619916e9d090cbd1bb8d12b632.tar.xz | |
iio:tcs3472: Check for buffer enabled and locking
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
| -rw-r--r-- | drivers/iio/light/tcs3472.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/iio/light/tcs3472.c b/drivers/iio/light/tcs3472.c index fe063a0a21cd..752569985d1d 100644 --- a/drivers/iio/light/tcs3472.c +++ b/drivers/iio/light/tcs3472.c @@ -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; |