iio: Update iio_channel_get_all and iio_channel_get_all_cb API

Pass device pointer instead of device name as parameter to iio_channel_get_all
and iio_channel_get_all_cb. This will enable us to use OF information to
retrieve consumer channel information.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/buffer_cb.c

@@ -25,7 +25,7 @@ static struct iio_buffer_access_funcs iio_cb_access = {
 	.store_to = &iio_buffer_cb_store_to,
 };
 
-struct iio_cb_buffer *iio_channel_get_all_cb(const char *name,
+struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
 					     int (*cb)(u8 *data,
 						       void *private),
 					     void *private)
@@ -46,7 +46,7 @@ struct iio_cb_buffer *iio_channel_get_all_cb(const char *name,
 	cb_buff->buffer.access = &iio_cb_access;
 	INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
 
-	cb_buff->channels = iio_channel_get_all(name);
+	cb_buff->channels = iio_channel_get_all(dev);
 	if (IS_ERR(cb_buff->channels)) {
 		ret = PTR_ERR(cb_buff->channels);
 		goto error_free_cb_buff;

drivers/iio/inkern.c

@@ -167,16 +167,18 @@ void iio_channel_release(struct iio_channel *channel)
 }
 EXPORT_SYMBOL_GPL(iio_channel_release);
 
-struct iio_channel *iio_channel_get_all(const char *name)
+struct iio_channel *iio_channel_get_all(struct device *dev)
 {
+	const char *name;
 	struct iio_channel *chans;
 	struct iio_map_internal *c = NULL;
 	int nummaps = 0;
 	int mapind = 0;
 	int i, ret;
 
-	if (name == NULL)
+	if (dev == NULL)
 		return ERR_PTR(-EINVAL);
+	name = dev_name(dev);
 
 	mutex_lock(&iio_map_list_lock);
 	/* first count the matching maps */