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authorAlexander Usyskin <alexander.usyskin@intel.com>2015-07-26 09:54:23 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-08-03 17:30:00 -0700
commitbb2ef9c39db2e3c2562b4e439b2b00dc42e2c026 (patch)
tree632acc72047a233febc00c0a9d38ac423b25ba77 /drivers/misc/mei/bus.c
parent237092bf034a648611f61eb1f0965e9ba1b08871 (diff)
mei: bus: add and call callback on notify event
Enable drivers on mei client bus to subscribe to asynchronous event notifications. Introduce events_mask to the existing callback infrastructure so it is possible to handle both RX and event notification. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei/bus.c')
-rw-r--r--drivers/misc/mei/bus.c50
1 files changed, 46 insertions, 4 deletions
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 3ab08e522fb8..eef1c6b46ad8 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -222,7 +222,33 @@ static void mei_bus_event_work(struct work_struct *work)
cldev->events = 0;
/* Prepare for the next read */
- mei_cl_read_start(cldev->cl, 0, NULL);
+ if (cldev->events_mask & BIT(MEI_CL_EVENT_RX))
+ mei_cl_read_start(cldev->cl, 0, NULL);
+}
+
+/**
+ * mei_cl_bus_notify_event - schedule notify cb on bus client
+ *
+ * @cl: host client
+ */
+void mei_cl_bus_notify_event(struct mei_cl *cl)
+{
+ struct mei_cl_device *cldev = cl->cldev;
+
+ if (!cldev || !cldev->event_cb)
+ return;
+
+ if (!(cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF)))
+ return;
+
+ if (!cl->notify_ev)
+ return;
+
+ set_bit(MEI_CL_EVENT_NOTIF, &cldev->events);
+
+ schedule_work(&cldev->event_work);
+
+ cl->notify_ev = false;
}
/**
@@ -237,6 +263,9 @@ void mei_cl_bus_rx_event(struct mei_cl *cl)
if (!cldev || !cldev->event_cb)
return;
+ if (!(cldev->events_mask & BIT(MEI_CL_EVENT_RX)))
+ return;
+
set_bit(MEI_CL_EVENT_RX, &cldev->events);
schedule_work(&cldev->event_work);
@@ -247,6 +276,7 @@ void mei_cl_bus_rx_event(struct mei_cl *cl)
*
* @cldev: me client devices
* @event_cb: callback function
+ * @events_mask: requested events bitmask
* @context: driver context data
*
* Return: 0 on success
@@ -254,6 +284,7 @@ void mei_cl_bus_rx_event(struct mei_cl *cl)
* <0 on other errors
*/
int mei_cl_register_event_cb(struct mei_cl_device *cldev,
+ unsigned long events_mask,
mei_cl_event_cb_t event_cb, void *context)
{
int ret;
@@ -262,13 +293,24 @@ int mei_cl_register_event_cb(struct mei_cl_device *cldev,
return -EALREADY;
cldev->events = 0;
+ cldev->events_mask = events_mask;
cldev->event_cb = event_cb;
cldev->event_context = context;
INIT_WORK(&cldev->event_work, mei_bus_event_work);
- ret = mei_cl_read_start(cldev->cl, 0, NULL);
- if (ret && ret != -EBUSY)
- return ret;
+ if (cldev->events_mask & BIT(MEI_CL_EVENT_RX)) {
+ ret = mei_cl_read_start(cldev->cl, 0, NULL);
+ if (ret && ret != -EBUSY)
+ return ret;
+ }
+
+ if (cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF)) {
+ mutex_lock(&cldev->cl->dev->device_lock);
+ ret = mei_cl_notify_request(cldev->cl, NULL, event_cb ? 1 : 0);
+ mutex_unlock(&cldev->cl->dev->device_lock);
+ if (ret)
+ return ret;
+ }
return 0;
}