iio: inkern: api for manipulating ext_info of iio channels

Extend the inkern api with functions for reading and writing ext_info
of iio channels.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 7a13535dc3e99b016c546f48a91009d458ea5b72..8292ad4435ea0c67a4b11e761cd1433a499894bf 100644 (file)
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -869,3 +869,63 @@ err_unlock:
        return ret;
 }
 EXPORT_SYMBOL_GPL(iio_write_channel_raw);
+
+unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan)
+{
+       const struct iio_chan_spec_ext_info *ext_info;
+       unsigned int i = 0;
+
+       if (!chan->channel->ext_info)
+               return i;
+
+       for (ext_info = chan->channel->ext_info; ext_info->name; ext_info++)
+               ++i;
+
+       return i;
+}
+EXPORT_SYMBOL_GPL(iio_get_channel_ext_info_count);
+
+static const struct iio_chan_spec_ext_info *iio_lookup_ext_info(
+                                               const struct iio_channel *chan,
+                                               const char *attr)
+{
+       const struct iio_chan_spec_ext_info *ext_info;
+
+       if (!chan->channel->ext_info)
+               return NULL;
+
+       for (ext_info = chan->channel->ext_info; ext_info->name; ++ext_info) {
+               if (!strcmp(attr, ext_info->name))
+                       return ext_info;
+       }
+
+       return NULL;
+}
+
+ssize_t iio_read_channel_ext_info(struct iio_channel *chan,
+                                 const char *attr, char *buf)
+{
+       const struct iio_chan_spec_ext_info *ext_info;
+
+       ext_info = iio_lookup_ext_info(chan, attr);
+       if (!ext_info)
+               return -EINVAL;
+
+       return ext_info->read(chan->indio_dev, ext_info->private,
+                             chan->channel, buf);
+}
+EXPORT_SYMBOL_GPL(iio_read_channel_ext_info);
+
+ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr,
+                                  const char *buf, size_t len)
+{
+       const struct iio_chan_spec_ext_info *ext_info;
+
+       ext_info = iio_lookup_ext_info(chan, attr);
+       if (!ext_info)
+               return -EINVAL;
+
+       return ext_info->write(chan->indio_dev, ext_info->private,
+                              chan->channel, buf, len);
+}
+EXPORT_SYMBOL_GPL(iio_write_channel_ext_info);

diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index 47eeec3218b5e31c30ed4583271af6ee4aa225aa..5e347a9805fdae5791983892dbd5ab0639144a20 100644 (file)
--- a/include/linux/iio/consumer.h
+++ b/include/linux/iio/consumer.h
@@ -312,4 +312,41 @@ int iio_read_channel_scale(struct iio_channel *chan, int *val,
 int iio_convert_raw_to_processed(struct iio_channel *chan, int raw,
        int *processed, unsigned int scale);
 
+/**
+ * iio_get_channel_ext_info_count() - get number of ext_info attributes
+ *                                   connected to the channel.
+ * @chan:              The channel being queried
+ *
+ * Returns the number of ext_info attributes
+ */
+unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan);
+
+/**
+ * iio_read_channel_ext_info() - read ext_info attribute from a given channel
+ * @chan:              The channel being queried.
+ * @attr:              The ext_info attribute to read.
+ * @buf:               Where to store the attribute value. Assumed to hold
+ *                     at least PAGE_SIZE bytes.
+ *
+ * Returns the number of bytes written to buf (perhaps w/o zero termination;
+ * it need not even be a string), or an error code.
+ */
+ssize_t iio_read_channel_ext_info(struct iio_channel *chan,
+                                 const char *attr, char *buf);
+
+/**
+ * iio_write_channel_ext_info() - write ext_info attribute from a given channel
+ * @chan:              The channel being queried.
+ * @attr:              The ext_info attribute to read.
+ * @buf:               The new attribute value. Strings needs to be zero-
+ *                     terminated, but the terminator should not be included
+ *                     in the below len.
+ * @len:               The size of the new attribute value.
+ *
+ * Returns the number of accepted bytes, which should be the same as len.
+ * An error code can also be returned.
+ */
+ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr,
+                                  const char *buf, size_t len);
+
 #endif