Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / iio / buffer_cb.c

diff --git a/kernel/drivers/iio/buffer_cb.c b/kernel/drivers/iio/buffer_cb.c
new file mode 100644 (file)
index 0000000..eb46e72
--- /dev/null
+++ b/kernel/drivers/iio/buffer_cb.c
@@ -0,0 +1,124 @@
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/consumer.h>
+
+struct iio_cb_buffer {
+       struct iio_buffer buffer;
+       int (*cb)(const void *data, void *private);
+       void *private;
+       struct iio_channel *channels;
+};
+
+static struct iio_cb_buffer *buffer_to_cb_buffer(struct iio_buffer *buffer)
+{
+       return container_of(buffer, struct iio_cb_buffer, buffer);
+}
+
+static int iio_buffer_cb_store_to(struct iio_buffer *buffer, const void *data)
+{
+       struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
+       return cb_buff->cb(data, cb_buff->private);
+}
+
+static void iio_buffer_cb_release(struct iio_buffer *buffer)
+{
+       struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
+       kfree(cb_buff->buffer.scan_mask);
+       kfree(cb_buff);
+}
+
+static const struct iio_buffer_access_funcs iio_cb_access = {
+       .store_to = &iio_buffer_cb_store_to,
+       .release = &iio_buffer_cb_release,
+};
+
+struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
+                                            int (*cb)(const void *data,
+                                                      void *private),
+                                            void *private)
+{
+       int ret;
+       struct iio_cb_buffer *cb_buff;
+       struct iio_dev *indio_dev;
+       struct iio_channel *chan;
+
+       cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
+       if (cb_buff == NULL)
+               return ERR_PTR(-ENOMEM);
+
+       iio_buffer_init(&cb_buff->buffer);
+
+       cb_buff->private = private;
+       cb_buff->cb = cb;
+       cb_buff->buffer.access = &iio_cb_access;
+       INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
+
+       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;
+       }
+
+       indio_dev = cb_buff->channels[0].indio_dev;
+       cb_buff->buffer.scan_mask
+               = kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long),
+                         GFP_KERNEL);
+       if (cb_buff->buffer.scan_mask == NULL) {
+               ret = -ENOMEM;
+               goto error_release_channels;
+       }
+       chan = &cb_buff->channels[0];
+       while (chan->indio_dev) {
+               if (chan->indio_dev != indio_dev) {
+                       ret = -EINVAL;
+                       goto error_free_scan_mask;
+               }
+               set_bit(chan->channel->scan_index,
+                       cb_buff->buffer.scan_mask);
+               chan++;
+       }
+
+       return cb_buff;
+
+error_free_scan_mask:
+       kfree(cb_buff->buffer.scan_mask);
+error_release_channels:
+       iio_channel_release_all(cb_buff->channels);
+error_free_cb_buff:
+       kfree(cb_buff);
+       return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
+
+int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
+{
+       return iio_update_buffers(cb_buff->channels[0].indio_dev,
+                                 &cb_buff->buffer,
+                                 NULL);
+}
+EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
+
+void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
+{
+       iio_update_buffers(cb_buff->channels[0].indio_dev,
+                          NULL,
+                          &cb_buff->buffer);
+}
+EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
+
+void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
+{
+       iio_channel_release_all(cb_buff->channels);
+       iio_buffer_put(&cb_buff->buffer);
+}
+EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);
+
+struct iio_channel
+*iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer)
+{
+       return cb_buffer->channels;
+}
+EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);