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mei: bus: add and call callback on notify event

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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>
This commit is contained in:
Alexander Usyskin
2015-07-26 09:54:23 +03:00
committed by Greg Kroah-Hartman
parent 237092bf03
commit bb2ef9c39d
5 changed files with 55 additions and 5 deletions
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50
drivers/misc/mei/bus.c
View File

@@ -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;
}