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path: root/drivers/iio/inkern.c
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Diffstat (limited to 'drivers/iio/inkern.c')
-rw-r--r--drivers/iio/inkern.c123
1 files changed, 120 insertions, 3 deletions
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index c4757e6367e7..b0f4630a163f 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -658,6 +658,31 @@ err_unlock:
}
EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed);
+static int iio_read_channel_attribute(struct iio_channel *chan,
+ int *val, int *val2,
+ enum iio_chan_info_enum attribute)
+{
+ int ret;
+
+ mutex_lock(&chan->indio_dev->info_exist_lock);
+ if (chan->indio_dev->info == NULL) {
+ ret = -ENODEV;
+ goto err_unlock;
+ }
+
+ ret = iio_channel_read(chan, val, val2, attribute);
+err_unlock:
+ mutex_unlock(&chan->indio_dev->info_exist_lock);
+
+ return ret;
+}
+
+int iio_read_channel_offset(struct iio_channel *chan, int *val, int *val2)
+{
+ return iio_read_channel_attribute(chan, val, val2, IIO_CHAN_INFO_OFFSET);
+}
+EXPORT_SYMBOL_GPL(iio_read_channel_offset);
+
int iio_read_channel_processed(struct iio_channel *chan, int *val)
{
int ret;
@@ -687,21 +712,113 @@ EXPORT_SYMBOL_GPL(iio_read_channel_processed);
int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2)
{
+ return iio_read_channel_attribute(chan, val, val2, IIO_CHAN_INFO_SCALE);
+}
+EXPORT_SYMBOL_GPL(iio_read_channel_scale);
+
+static int iio_channel_read_avail(struct iio_channel *chan,
+ const int **vals, int *type, int *length,
+ enum iio_chan_info_enum info)
+{
+ if (!iio_channel_has_available(chan->channel, info))
+ return -EINVAL;
+
+ return chan->indio_dev->info->read_avail(chan->indio_dev, chan->channel,
+ vals, type, length, info);
+}
+
+int iio_read_avail_channel_raw(struct iio_channel *chan,
+ const int **vals, int *length)
+{
int ret;
+ int type;
mutex_lock(&chan->indio_dev->info_exist_lock);
- if (chan->indio_dev->info == NULL) {
+ if (!chan->indio_dev->info) {
ret = -ENODEV;
goto err_unlock;
}
- ret = iio_channel_read(chan, val, val2, IIO_CHAN_INFO_SCALE);
+ ret = iio_channel_read_avail(chan,
+ vals, &type, length, IIO_CHAN_INFO_RAW);
err_unlock:
mutex_unlock(&chan->indio_dev->info_exist_lock);
+ if (ret >= 0 && type != IIO_VAL_INT) {
+ /* raw values are assumed to be IIO_VAL_INT */
+ ret = -EINVAL;
+ goto err_unlock;
+ }
+
return ret;
}
-EXPORT_SYMBOL_GPL(iio_read_channel_scale);
+EXPORT_SYMBOL_GPL(iio_read_avail_channel_raw);
+
+static int iio_channel_read_max(struct iio_channel *chan,
+ int *val, int *val2, int *type,
+ enum iio_chan_info_enum info)
+{
+ int unused;
+ const int *vals;
+ int length;
+ int ret;
+
+ if (!val2)
+ val2 = &unused;
+
+ ret = iio_channel_read_avail(chan, &vals, type, &length, info);
+ switch (ret) {
+ case IIO_AVAIL_RANGE:
+ switch (*type) {
+ case IIO_VAL_INT:
+ *val = vals[2];
+ break;
+ default:
+ *val = vals[4];
+ *val2 = vals[5];
+ }
+ return 0;
+
+ case IIO_AVAIL_LIST:
+ if (length <= 0)
+ return -EINVAL;
+ switch (*type) {
+ case IIO_VAL_INT:
+ *val = vals[--length];
+ while (length) {
+ if (vals[--length] > *val)
+ *val = vals[length];
+ }
+ break;
+ default:
+ /* FIXME: learn about max for other iio values */
+ return -EINVAL;
+ }
+ return 0;
+
+ default:
+ return ret;
+ }
+}
+
+int iio_read_max_channel_raw(struct iio_channel *chan, int *val)
+{
+ int ret;
+ int type;
+
+ mutex_lock(&chan->indio_dev->info_exist_lock);
+ if (!chan->indio_dev->info) {
+ ret = -ENODEV;
+ goto err_unlock;
+ }
+
+ ret = iio_channel_read_max(chan, val, NULL, &type, IIO_CHAN_INFO_RAW);
+err_unlock:
+ mutex_unlock(&chan->indio_dev->info_exist_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_read_max_channel_raw);
int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type)
{