Commit bb2ef9c3 authored by Alexander Usyskin's avatar Alexander Usyskin Committed by Greg Kroah-Hartman

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: default avatarAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 237092bf
......@@ -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;
}
......
......@@ -1375,6 +1375,8 @@ void mei_cl_notify(struct mei_cl *cl)
if (cl->ev_async)
kill_fasync(&cl->ev_async, SIGIO, POLL_PRI);
mei_cl_bus_notify_event(cl);
}
/**
......
......@@ -345,6 +345,7 @@ ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
bool blocking);
ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
void mei_cl_bus_rx_event(struct mei_cl *cl);
void mei_cl_bus_notify_event(struct mei_cl *cl);
void mei_cl_bus_remove_devices(struct mei_device *bus);
int mei_cl_bus_init(void);
void mei_cl_bus_exit(void);
......
......@@ -355,7 +355,8 @@ static int nfc_mei_phy_enable(void *phy_id)
goto err;
}
r = mei_cl_register_event_cb(phy->device, nfc_mei_event_cb, phy);
r = mei_cl_register_event_cb(phy->device, BIT(MEI_CL_EVENT_RX),
nfc_mei_event_cb, phy);
if (r) {
pr_err("Event cb registration failed %d\n", r);
goto err;
......
......@@ -28,6 +28,7 @@ typedef void (*mei_cl_event_cb_t)(struct mei_cl_device *device,
* @event_cb: Drivers register this callback to get asynchronous ME
* events (e.g. Rx buffer pending) notifications.
* @event_context: event callback run context
* @events_mask: Events bit mask requested by driver.
* @events: Events bitmask sent to the driver.
*
* @do_match: wheather device can be matched with a driver
......@@ -46,6 +47,7 @@ struct mei_cl_device {
struct work_struct event_work;
mei_cl_event_cb_t event_cb;
void *event_context;
unsigned long events_mask;
unsigned long events;
unsigned int do_match:1;
......@@ -76,10 +78,12 @@ ssize_t mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length);
ssize_t mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length);
int mei_cl_register_event_cb(struct mei_cl_device *device,
unsigned long event_mask,
mei_cl_event_cb_t read_cb, void *context);
#define MEI_CL_EVENT_RX 0
#define MEI_CL_EVENT_TX 1
#define MEI_CL_EVENT_NOTIF 2
void *mei_cl_get_drvdata(const struct mei_cl_device *device);
void mei_cl_set_drvdata(struct mei_cl_device *device, void *data);
......
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