staging: fsl-mc: Bind/unbind driver when MC object is plugged/unplugged
Signed-off-by: J. German Rivera <German.Rivera@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/fsl-mc/bus/dprc-driver.c b/drivers/staging/fsl-mc/bus/dprc-driver.c
index f02e5e4..9568eea 100644
--- a/drivers/staging/fsl-mc/bus/dprc-driver.c
+++ b/drivers/staging/fsl-mc/bus/dprc-driver.c
@@ -112,6 +112,41 @@
}
/**
+ * check_plugged_state_change - Check change in an MC object's plugged state
+ *
+ * @mc_dev: pointer to the fsl-mc device for a given MC object
+ * @obj_desc: pointer to the MC object's descriptor in the MC
+ *
+ * If the plugged state has changed from unplugged to plugged, the fsl-mc
+ * device is bound to the corresponding device driver.
+ * If the plugged state has changed from plugged to unplugged, the fsl-mc
+ * device is unbound from the corresponding device driver.
+ */
+static void check_plugged_state_change(struct fsl_mc_device *mc_dev,
+ struct dprc_obj_desc *obj_desc)
+{
+ int error;
+ uint32_t plugged_flag_at_mc =
+ (obj_desc->state & DPRC_OBJ_STATE_PLUGGED);
+
+ if (plugged_flag_at_mc !=
+ (mc_dev->obj_desc.state & DPRC_OBJ_STATE_PLUGGED)) {
+ if (plugged_flag_at_mc) {
+ mc_dev->obj_desc.state |= DPRC_OBJ_STATE_PLUGGED;
+ error = device_attach(&mc_dev->dev);
+ if (error < 0) {
+ dev_err(&mc_dev->dev,
+ "device_attach() failed: %d\n",
+ error);
+ }
+ } else {
+ mc_dev->obj_desc.state &= ~DPRC_OBJ_STATE_PLUGGED;
+ device_release_driver(&mc_dev->dev);
+ }
+ }
+}
+
+/**
* dprc_add_new_devices - Adds devices to the logical bus for a DPRC
*
* @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
@@ -142,8 +177,10 @@
* Check if device is already known to Linux:
*/
child_dev = fsl_mc_device_lookup(obj_desc, mc_bus_dev);
- if (child_dev)
+ if (child_dev) {
+ check_plugged_state_change(child_dev, obj_desc);
continue;
+ }
error = fsl_mc_device_add(obj_desc, mc_io, &mc_bus_dev->dev,
&child_dev);