From: David Kershner <david.kersh...@unisys.com>
Need access functions to set channel polling
Signed-off-by: David Kershner <david.kersh...@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.ro...@unisys.com>
---
drivers/staging/unisys/visorbus/visorbus_main.c | 55 +++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/drivers/staging/unisys/visorbus/visorbus_main.c
b/drivers/staging/unisys/visorbus/visorbus_main.c
index 63e7863..4304ca0 100644
--- a/drivers/staging/unisys/visorbus/visorbus_main.c
+++ b/drivers/staging/unisys/visorbus/visorbus_main.c
@@ -977,6 +977,61 @@ visorbus_disable_channel_interrupts(struct visor_device
*dev)
}
EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts);
+int visorbus_set_channel_features(struct visor_device *dev, u64 feature_bits)
+{
+ int channel_offset = 0, err = 0;
+ u64 features;
+
+ channel_offset = offsetof(struct channel_header,
+ features);
+ err = visorbus_read_channel(dev, channel_offset, &features, 8);
+ if (err) {
+ dev_err(&dev->device,
+ "%s failed to get features from chan (%d)\n",
+ __func__, err);
+ return err;
+ }
+
+ features |= (feature_bits);
+
+ err = visorbus_write_channel(dev, channel_offset, &features, 8);
+ if (err) {
+ dev_err(&dev->device,
+ "%s failed to get features from chan (%d)\n",
+ __func__, err);
+ return err;
+ }
+ return err;
+}
+
+int visorbus_clear_channel_features(struct visor_device *dev, u64 feature_bits)
+{
+ int channel_offset = 0, err = 0;
+ u64 features, mask;
+
+ channel_offset = offsetof(struct channel_header,
+ features);
+ err = visorbus_read_channel(dev, channel_offset, &features, 8);
+ if (err) {
+ dev_err(&dev->device,
+ "%s failed to get features from chan (%d)\n",
+ __func__, err);
+ return err;
+ }
+
+ mask = ~(feature_bits);
+ features &= mask;
+
+ err = visorbus_write_channel(dev, channel_offset, &features, 8);
+ if (err) {
+ dev_err(&dev->device,
+ "%s failed to get features from chan (%d)\n",
+ __func__, err);
+ return err;
+ }
+ return err;
+}
+
/** This is how everything starts from the device end.
* This function is called when a channel first appears via a ControlVM
* message. In response, this function allocates a visor_device to
--
2.5.0
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