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authorPeter Meerwald <p.meerwald@bct-electronic.com>2014-05-07 16:38:00 +0400
committerJonathan Cameron <jic23@kernel.org>2014-07-07 11:59:16 +0400
commit2a58b4f88e3e51619916e9d090cbd1bb8d12b632 (patch)
treebb7b30607fab6a1968e142486ae0c13acf84a150
parent4ff9f633c35e2d94eb92f92c48ae0d9172242889 (diff)
downloadlinux-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.c11
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;