#define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
#define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev)
-static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
-{
- struct mei_cl_device *device = to_mei_cl_device(dev);
- struct mei_cl_driver *driver = to_mei_cl_driver(drv);
- const struct mei_cl_device_id *id;
-
- if (!device)
- return 0;
-
- if (!driver || !driver->id_table)
- return 0;
-
- id = driver->id_table;
-
- while (id->name[0]) {
- if (!strncmp(dev_name(dev), id->name, sizeof(id->name)))
- return 1;
-
- id++;
- }
-
- return 0;
-}
-
-static int mei_cl_device_probe(struct device *dev)
-{
- struct mei_cl_device *device = to_mei_cl_device(dev);
- struct mei_cl_driver *driver;
- struct mei_cl_device_id id;
-
- if (!device)
- return 0;
-
- driver = to_mei_cl_driver(dev->driver);
- if (!driver || !driver->probe)
- return -ENODEV;
-
- dev_dbg(dev, "Device probe\n");
-
- strlcpy(id.name, dev_name(dev), sizeof(id.name));
-
- return driver->probe(device, &id);
-}
-
-static int mei_cl_device_remove(struct device *dev)
-{
- struct mei_cl_device *device = to_mei_cl_device(dev);
- struct mei_cl_driver *driver;
-
- if (!device || !dev->driver)
- return 0;
-
- if (device->event_cb) {
- device->event_cb = NULL;
- cancel_work_sync(&device->event_work);
- }
-
- driver = to_mei_cl_driver(dev->driver);
- if (!driver->remove) {
- dev->driver = NULL;
-
- return 0;
- }
-
- return driver->remove(device);
-}
-
-static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
- char *buf)
-{
- int len;
-
- len = snprintf(buf, PAGE_SIZE, "mei:%s\n", dev_name(dev));
-
- return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
-}
-static DEVICE_ATTR_RO(modalias);
-
-static struct attribute *mei_cl_dev_attrs[] = {
- &dev_attr_modalias.attr,
- NULL,
-};
-ATTRIBUTE_GROUPS(mei_cl_dev);
-
-static int mei_cl_uevent(struct device *dev, struct kobj_uevent_env *env)
-{
- if (add_uevent_var(env, "MODALIAS=mei:%s", dev_name(dev)))
- return -ENOMEM;
-
- return 0;
-}
-
-static struct bus_type mei_cl_bus_type = {
- .name = "mei",
- .dev_groups = mei_cl_dev_groups,
- .match = mei_cl_device_match,
- .probe = mei_cl_device_probe,
- .remove = mei_cl_device_remove,
- .uevent = mei_cl_uevent,
-};
-
-static void mei_cl_dev_release(struct device *dev)
-{
- kfree(to_mei_cl_device(dev));
-}
-
-static struct device_type mei_cl_device_type = {
- .release = mei_cl_dev_release,
-};
-
-struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *dev,
- uuid_le uuid)
-{
- struct mei_cl *cl;
-
- list_for_each_entry(cl, &dev->device_list, device_link) {
- if (!uuid_le_cmp(uuid, cl->cl_uuid))
- return cl;
- }
-
- return NULL;
-}
-struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
- uuid_le uuid, char *name,
- struct mei_cl_ops *ops)
-{
- struct mei_cl_device *device;
- struct mei_cl *cl;
- int status;
-
- cl = mei_cl_bus_find_cl_by_uuid(dev, uuid);
- if (cl == NULL)
- return NULL;
-
- device = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
- if (!device)
- return NULL;
-
- device->cl = cl;
- device->ops = ops;
-
- device->dev.parent = dev->dev;
- device->dev.bus = &mei_cl_bus_type;
- device->dev.type = &mei_cl_device_type;
-
- dev_set_name(&device->dev, "%s", name);
-
- status = device_register(&device->dev);
- if (status) {
- dev_err(dev->dev, "Failed to register MEI device\n");
- kfree(device);
- return NULL;
- }
-
- cl->device = device;
-
- dev_dbg(&device->dev, "client %s registered\n", name);
-
- return device;
-}
-EXPORT_SYMBOL_GPL(mei_cl_add_device);
-
-void mei_cl_remove_device(struct mei_cl_device *device)
-{
- device_unregister(&device->dev);
-}
-EXPORT_SYMBOL_GPL(mei_cl_remove_device);
-
-int __mei_cl_driver_register(struct mei_cl_driver *driver, struct module *owner)
-{
- int err;
-
- driver->driver.name = driver->name;
- driver->driver.owner = owner;
- driver->driver.bus = &mei_cl_bus_type;
-
- err = driver_register(&driver->driver);
- if (err)
- return err;
-
- pr_debug("mei: driver [%s] registered\n", driver->driver.name);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(__mei_cl_driver_register);
-
-void mei_cl_driver_unregister(struct mei_cl_driver *driver)
-{
- driver_unregister(&driver->driver);
-
- pr_debug("mei: driver [%s] unregistered\n", driver->driver.name);
-}
-EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
-
-static ssize_t ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
+/**
+ * __mei_cl_send - internal client send (write)
+ *
+ * @cl: host client
+ * @buf: buffer to send
+ * @length: buffer length
+ * @blocking: wait for write completion
+ *
+ * Return: written size bytes or < 0 on error
+ */
+ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
bool blocking)
{
- struct mei_device *dev;
- struct mei_me_client *me_cl = NULL;
+ struct mei_device *bus;
struct mei_cl_cb *cb = NULL;
ssize_t rets;
if (WARN_ON(!cl || !cl->dev))
return -ENODEV;
- dev = cl->dev;
+ bus = cl->dev;
- mutex_lock(&dev->device_lock);
+ mutex_lock(&bus->device_lock);
if (!mei_cl_is_connected(cl)) {
rets = -ENODEV;
goto out;
}
/* Check if we have an ME client device */
- me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
- if (!me_cl) {
+ if (!mei_me_cl_is_active(cl->me_cl)) {
rets = -ENOTTY;
goto out;
}
- if (length > me_cl->props.max_msg_length) {
+ if (length > mei_cl_mtu(cl)) {
rets = -EFBIG;
goto out;
}
rets = mei_cl_write(cl, cb, blocking);
out:
- mei_me_cl_put(me_cl);
- mutex_unlock(&dev->device_lock);
+ mutex_unlock(&bus->device_lock);
if (rets < 0)
mei_io_cb_free(cb);
return rets;
}
+/**
+ * __mei_cl_recv - internal client receive (read)
+ *
+ * @cl: host client
+ * @buf: buffer to receive
+ * @length: buffer length
+ *
+ * Return: read size in bytes of < 0 on error
+ */
ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length)
{
- struct mei_device *dev;
+ struct mei_device *bus;
struct mei_cl_cb *cb;
size_t r_length;
ssize_t rets;
if (WARN_ON(!cl || !cl->dev))
return -ENODEV;
- dev = cl->dev;
+ bus = cl->dev;
- mutex_lock(&dev->device_lock);
+ mutex_lock(&bus->device_lock);
cb = mei_cl_read_cb(cl, NULL);
if (cb)
if (rets && rets != -EBUSY)
goto out;
+ /* wait on event only if there is no other waiter */
if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) {
- mutex_unlock(&dev->device_lock);
+ mutex_unlock(&bus->device_lock);
if (wait_event_interruptible(cl->rx_wait,
(!list_empty(&cl->rd_completed)) ||
return -ERESTARTSYS;
}
- mutex_lock(&dev->device_lock);
+ mutex_lock(&bus->device_lock);
if (!mei_cl_is_connected(cl)) {
rets = -EBUSY;
free:
mei_io_cb_free(cb);
out:
- mutex_unlock(&dev->device_lock);
+ mutex_unlock(&bus->device_lock);
return rets;
}
-inline ssize_t __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length)
+/**
+ * mei_cldev_send - me device send (write)
+ *
+ * @cldev: me client device
+ * @buf: buffer to send
+ * @length: buffer length
+ *
+ * Return: written size in bytes or < 0 on error
+ */
+ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
{
- return ___mei_cl_send(cl, buf, length, 0);
-}
+ struct mei_cl *cl = cldev->cl;
-inline ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
-{
- return ___mei_cl_send(cl, buf, length, 1);
+ if (cl == NULL)
+ return -ENODEV;
+
+ return __mei_cl_send(cl, buf, length, 1);
}
+EXPORT_SYMBOL_GPL(mei_cldev_send);
-ssize_t mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
+/**
+ * mei_cldev_recv - client receive (read)
+ *
+ * @cldev: me client device
+ * @buf: buffer to receive
+ * @length: buffer length
+ *
+ * Return: read size in bytes of < 0 on error
+ */
+ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
{
- struct mei_cl *cl = device->cl;
+ struct mei_cl *cl = cldev->cl;
if (cl == NULL)
return -ENODEV;
- if (device->ops && device->ops->send)
- return device->ops->send(device, buf, length);
+ return __mei_cl_recv(cl, buf, length);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_recv);
- return __mei_cl_send(cl, buf, length);
+/**
+ * mei_cl_bus_event_work - dispatch rx event for a bus device
+ * and schedule new work
+ *
+ * @work: work
+ */
+static void mei_cl_bus_event_work(struct work_struct *work)
+{
+ struct mei_cl_device *cldev;
+
+ cldev = container_of(work, struct mei_cl_device, event_work);
+
+ if (cldev->event_cb)
+ cldev->event_cb(cldev, cldev->events, cldev->event_context);
+
+ cldev->events = 0;
+
+ /* Prepare for the next read */
+ if (cldev->events_mask & BIT(MEI_CL_EVENT_RX))
+ mei_cl_read_start(cldev->cl, 0, NULL);
}
-EXPORT_SYMBOL_GPL(mei_cl_send);
-ssize_t mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length)
+/**
+ * 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 *cl = device->cl;
+ struct mei_cl_device *cldev = cl->cldev;
- if (cl == NULL)
- return -ENODEV;
+ if (!cldev || !cldev->event_cb)
+ return;
- if (device->ops && device->ops->recv)
- return device->ops->recv(device, buf, length);
+ if (!(cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF)))
+ return;
- return __mei_cl_recv(cl, buf, length);
+ if (!cl->notify_ev)
+ return;
+
+ set_bit(MEI_CL_EVENT_NOTIF, &cldev->events);
+
+ schedule_work(&cldev->event_work);
+
+ cl->notify_ev = false;
}
-EXPORT_SYMBOL_GPL(mei_cl_recv);
-static void mei_bus_event_work(struct work_struct *work)
+/**
+ * mei_cl_bus_rx_event - schedule rx evenet
+ *
+ * @cl: host client
+ */
+void mei_cl_bus_rx_event(struct mei_cl *cl)
{
- struct mei_cl_device *device;
+ struct mei_cl_device *cldev = cl->cldev;
- device = container_of(work, struct mei_cl_device, event_work);
+ if (!cldev || !cldev->event_cb)
+ return;
- if (device->event_cb)
- device->event_cb(device, device->events, device->event_context);
+ if (!(cldev->events_mask & BIT(MEI_CL_EVENT_RX)))
+ return;
- device->events = 0;
+ set_bit(MEI_CL_EVENT_RX, &cldev->events);
- /* Prepare for the next read */
- mei_cl_read_start(device->cl, 0, NULL);
+ schedule_work(&cldev->event_work);
}
-int mei_cl_register_event_cb(struct mei_cl_device *device,
- mei_cl_event_cb_t event_cb, void *context)
+/**
+ * mei_cldev_register_event_cb - register event callback
+ *
+ * @cldev: me client devices
+ * @event_cb: callback function
+ * @events_mask: requested events bitmask
+ * @context: driver context data
+ *
+ * Return: 0 on success
+ * -EALREADY if an callback is already registered
+ * <0 on other errors
+ */
+int mei_cldev_register_event_cb(struct mei_cl_device *cldev,
+ unsigned long events_mask,
+ mei_cldev_event_cb_t event_cb, void *context)
{
- if (device->event_cb)
+ int ret;
+
+ if (cldev->event_cb)
return -EALREADY;
- device->events = 0;
- device->event_cb = event_cb;
- device->event_context = context;
- INIT_WORK(&device->event_work, mei_bus_event_work);
+ cldev->events = 0;
+ cldev->events_mask = events_mask;
+ cldev->event_cb = event_cb;
+ cldev->event_context = context;
+ INIT_WORK(&cldev->event_work, mei_cl_bus_event_work);
- mei_cl_read_start(device->cl, 0, NULL);
+ 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;
}
-EXPORT_SYMBOL_GPL(mei_cl_register_event_cb);
+EXPORT_SYMBOL_GPL(mei_cldev_register_event_cb);
-void *mei_cl_get_drvdata(const struct mei_cl_device *device)
+/**
+ * mei_cldev_get_drvdata - driver data getter
+ *
+ * @cldev: mei client device
+ *
+ * Return: driver private data
+ */
+void *mei_cldev_get_drvdata(const struct mei_cl_device *cldev)
{
- return dev_get_drvdata(&device->dev);
+ return dev_get_drvdata(&cldev->dev);
}
-EXPORT_SYMBOL_GPL(mei_cl_get_drvdata);
+EXPORT_SYMBOL_GPL(mei_cldev_get_drvdata);
-void mei_cl_set_drvdata(struct mei_cl_device *device, void *data)
+/**
+ * mei_cldev_set_drvdata - driver data setter
+ *
+ * @cldev: mei client device
+ * @data: data to store
+ */
+void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data)
{
- dev_set_drvdata(&device->dev, data);
+ dev_set_drvdata(&cldev->dev, data);
}
-EXPORT_SYMBOL_GPL(mei_cl_set_drvdata);
+EXPORT_SYMBOL_GPL(mei_cldev_set_drvdata);
-int mei_cl_enable_device(struct mei_cl_device *device)
+/**
+ * mei_cldev_uuid - return uuid of the underlying me client
+ *
+ * @cldev: mei client device
+ *
+ * Return: me client uuid
+ */
+const uuid_le *mei_cldev_uuid(const struct mei_cl_device *cldev)
{
- int err;
- struct mei_device *dev;
- struct mei_cl *cl = device->cl;
-
- if (cl == NULL)
- return -ENODEV;
+ return mei_me_cl_uuid(cldev->me_cl);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_uuid);
- dev = cl->dev;
+/**
+ * mei_cldev_ver - return protocol version of the underlying me client
+ *
+ * @cldev: mei client device
+ *
+ * Return: me client protocol version
+ */
+u8 mei_cldev_ver(const struct mei_cl_device *cldev)
+{
+ return mei_me_cl_ver(cldev->me_cl);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_ver);
- mutex_lock(&dev->device_lock);
+/**
+ * mei_cldev_enabled - check whether the device is enabled
+ *
+ * @cldev: mei client device
+ *
+ * Return: true if me client is initialized and connected
+ */
+bool mei_cldev_enabled(struct mei_cl_device *cldev)
+{
+ return cldev->cl && mei_cl_is_connected(cldev->cl);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_enabled);
- err = mei_cl_connect(cl, NULL);
- if (err < 0) {
- mutex_unlock(&dev->device_lock);
- dev_err(dev->dev, "Could not connect to the ME client");
+/**
+ * mei_cldev_enable_device - enable me client device
+ * create connection with me client
+ *
+ * @cldev: me client device
+ *
+ * Return: 0 on success and < 0 on error
+ */
+int mei_cldev_enable(struct mei_cl_device *cldev)
+{
+ struct mei_device *bus = cldev->bus;
+ struct mei_cl *cl;
+ int ret;
+
+ cl = cldev->cl;
+
+ if (!cl) {
+ mutex_lock(&bus->device_lock);
+ cl = mei_cl_alloc_linked(bus, MEI_HOST_CLIENT_ID_ANY);
+ mutex_unlock(&bus->device_lock);
+ if (IS_ERR(cl))
+ return PTR_ERR(cl);
+ /* update pointers */
+ cldev->cl = cl;
+ cl->cldev = cldev;
+ }
- return err;
+ mutex_lock(&bus->device_lock);
+ if (mei_cl_is_connected(cl)) {
+ ret = 0;
+ goto out;
}
- mutex_unlock(&dev->device_lock);
+ if (!mei_me_cl_is_active(cldev->me_cl)) {
+ dev_err(&cldev->dev, "me client is not active\n");
+ ret = -ENOTTY;
+ goto out;
+ }
- if (device->event_cb)
- mei_cl_read_start(device->cl, 0, NULL);
+ ret = mei_cl_connect(cl, cldev->me_cl, NULL);
+ if (ret < 0)
+ dev_err(&cldev->dev, "cannot connect\n");
- if (!device->ops || !device->ops->enable)
- return 0;
+out:
+ mutex_unlock(&bus->device_lock);
- return device->ops->enable(device);
+ return ret;
}
-EXPORT_SYMBOL_GPL(mei_cl_enable_device);
+EXPORT_SYMBOL_GPL(mei_cldev_enable);
-int mei_cl_disable_device(struct mei_cl_device *device)
+/**
+ * mei_cldev_disable - disable me client device
+ * disconnect form the me client
+ *
+ * @cldev: me client device
+ *
+ * Return: 0 on success and < 0 on error
+ */
+int mei_cldev_disable(struct mei_cl_device *cldev)
{
+ struct mei_device *bus;
+ struct mei_cl *cl;
int err;
- struct mei_device *dev;
- struct mei_cl *cl = device->cl;
- if (cl == NULL)
+ if (!cldev || !cldev->cl)
return -ENODEV;
- dev = cl->dev;
+ cl = cldev->cl;
- if (device->ops && device->ops->disable)
- device->ops->disable(device);
+ bus = cldev->bus;
- device->event_cb = NULL;
+ cldev->event_cb = NULL;
- mutex_lock(&dev->device_lock);
+ mutex_lock(&bus->device_lock);
if (!mei_cl_is_connected(cl)) {
- dev_err(dev->dev, "Already disconnected");
+ dev_err(bus->dev, "Already disconnected");
err = 0;
goto out;
}
- cl->state = MEI_FILE_DISCONNECTING;
-
err = mei_cl_disconnect(cl);
- if (err < 0) {
- dev_err(dev->dev, "Could not disconnect from the ME client");
- goto out;
- }
+ if (err < 0)
+ dev_err(bus->dev, "Could not disconnect from the ME client");
+out:
/* Flush queues and remove any pending read */
mei_cl_flush_queues(cl, NULL);
+ mei_cl_unlink(cl);
-out:
- mutex_unlock(&dev->device_lock);
+ kfree(cl);
+ cldev->cl = NULL;
+
+ mutex_unlock(&bus->device_lock);
return err;
+}
+EXPORT_SYMBOL_GPL(mei_cldev_disable);
+/**
+ * mei_cl_device_find - find matching entry in the driver id table
+ *
+ * @cldev: me client device
+ * @cldrv: me client driver
+ *
+ * Return: id on success; NULL if no id is matching
+ */
+static const
+struct mei_cl_device_id *mei_cl_device_find(struct mei_cl_device *cldev,
+ struct mei_cl_driver *cldrv)
+{
+ const struct mei_cl_device_id *id;
+ const uuid_le *uuid;
+ u8 version;
+ bool match;
+
+ uuid = mei_me_cl_uuid(cldev->me_cl);
+ version = mei_me_cl_ver(cldev->me_cl);
+
+ id = cldrv->id_table;
+ while (uuid_le_cmp(NULL_UUID_LE, id->uuid)) {
+ if (!uuid_le_cmp(*uuid, id->uuid)) {
+ match = true;
+
+ if (cldev->name[0])
+ if (strncmp(cldev->name, id->name,
+ sizeof(id->name)))
+ match = false;
+
+ if (id->version != MEI_CL_VERSION_ANY)
+ if (id->version != version)
+ match = false;
+ if (match)
+ return id;
+ }
+
+ id++;
+ }
+
+ return NULL;
}
-EXPORT_SYMBOL_GPL(mei_cl_disable_device);
-void mei_cl_bus_rx_event(struct mei_cl *cl)
+/**
+ * mei_cl_device_match - device match function
+ *
+ * @dev: device
+ * @drv: driver
+ *
+ * Return: 1 if matching device was found 0 otherwise
+ */
+static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
+{
+ struct mei_cl_device *cldev = to_mei_cl_device(dev);
+ struct mei_cl_driver *cldrv = to_mei_cl_driver(drv);
+ const struct mei_cl_device_id *found_id;
+
+ if (!cldev)
+ return 0;
+
+ if (!cldev->do_match)
+ return 0;
+
+ if (!cldrv || !cldrv->id_table)
+ return 0;
+
+ found_id = mei_cl_device_find(cldev, cldrv);
+ if (found_id)
+ return 1;
+
+ return 0;
+}
+
+/**
+ * mei_cl_device_probe - bus probe function
+ *
+ * @dev: device
+ *
+ * Return: 0 on success; < 0 otherwise
+ */
+static int mei_cl_device_probe(struct device *dev)
+{
+ struct mei_cl_device *cldev;
+ struct mei_cl_driver *cldrv;
+ const struct mei_cl_device_id *id;
+
+ cldev = to_mei_cl_device(dev);
+ cldrv = to_mei_cl_driver(dev->driver);
+
+ if (!cldev)
+ return 0;
+
+ if (!cldrv || !cldrv->probe)
+ return -ENODEV;
+
+ id = mei_cl_device_find(cldev, cldrv);
+ if (!id)
+ return -ENODEV;
+
+ __module_get(THIS_MODULE);
+
+ return cldrv->probe(cldev, id);
+}
+
+/**
+ * mei_cl_device_remove - remove device from the bus
+ *
+ * @dev: device
+ *
+ * Return: 0 on success; < 0 otherwise
+ */
+static int mei_cl_device_remove(struct device *dev)
+{
+ struct mei_cl_device *cldev = to_mei_cl_device(dev);
+ struct mei_cl_driver *cldrv;
+ int ret = 0;
+
+ if (!cldev || !dev->driver)
+ return 0;
+
+ if (cldev->event_cb) {
+ cldev->event_cb = NULL;
+ cancel_work_sync(&cldev->event_work);
+ }
+
+ cldrv = to_mei_cl_driver(dev->driver);
+ if (cldrv->remove)
+ ret = cldrv->remove(cldev);
+
+ module_put(THIS_MODULE);
+ dev->driver = NULL;
+ return ret;
+
+}
+
+static ssize_t name_show(struct device *dev, struct device_attribute *a,
+ char *buf)
{
- struct mei_cl_device *device = cl->device;
+ struct mei_cl_device *cldev = to_mei_cl_device(dev);
+ size_t len;
- if (!device || !device->event_cb)
+ len = snprintf(buf, PAGE_SIZE, "%s", cldev->name);
+
+ return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+static DEVICE_ATTR_RO(name);
+
+static ssize_t uuid_show(struct device *dev, struct device_attribute *a,
+ char *buf)
+{
+ struct mei_cl_device *cldev = to_mei_cl_device(dev);
+ const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
+ size_t len;
+
+ len = snprintf(buf, PAGE_SIZE, "%pUl", uuid);
+
+ return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+static DEVICE_ATTR_RO(uuid);
+
+static ssize_t version_show(struct device *dev, struct device_attribute *a,
+ char *buf)
+{
+ struct mei_cl_device *cldev = to_mei_cl_device(dev);
+ u8 version = mei_me_cl_ver(cldev->me_cl);
+ size_t len;
+
+ len = snprintf(buf, PAGE_SIZE, "%02X", version);
+
+ return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+static DEVICE_ATTR_RO(version);
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
+ char *buf)
+{
+ struct mei_cl_device *cldev = to_mei_cl_device(dev);
+ const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
+ size_t len;
+
+ len = snprintf(buf, PAGE_SIZE, "mei:%s:%pUl:", cldev->name, uuid);
+ return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+static DEVICE_ATTR_RO(modalias);
+
+static struct attribute *mei_cldev_attrs[] = {
+ &dev_attr_name.attr,
+ &dev_attr_uuid.attr,
+ &dev_attr_version.attr,
+ &dev_attr_modalias.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(mei_cldev);
+
+/**
+ * mei_cl_device_uevent - me client bus uevent handler
+ *
+ * @dev: device
+ * @env: uevent kobject
+ *
+ * Return: 0 on success -ENOMEM on when add_uevent_var fails
+ */
+static int mei_cl_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct mei_cl_device *cldev = to_mei_cl_device(dev);
+ const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
+ u8 version = mei_me_cl_ver(cldev->me_cl);
+
+ if (add_uevent_var(env, "MEI_CL_VERSION=%d", version))
+ return -ENOMEM;
+
+ if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid))
+ return -ENOMEM;
+
+ if (add_uevent_var(env, "MEI_CL_NAME=%s", cldev->name))
+ return -ENOMEM;
+
+ if (add_uevent_var(env, "MODALIAS=mei:%s:%pUl:%02X:",
+ cldev->name, uuid, version))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static struct bus_type mei_cl_bus_type = {
+ .name = "mei",
+ .dev_groups = mei_cldev_groups,
+ .match = mei_cl_device_match,
+ .probe = mei_cl_device_probe,
+ .remove = mei_cl_device_remove,
+ .uevent = mei_cl_device_uevent,
+};
+
+static struct mei_device *mei_dev_bus_get(struct mei_device *bus)
+{
+ if (bus)
+ get_device(bus->dev);
+
+ return bus;
+}
+
+static void mei_dev_bus_put(struct mei_device *bus)
+{
+ if (bus)
+ put_device(bus->dev);
+}
+
+static void mei_cl_bus_dev_release(struct device *dev)
+{
+ struct mei_cl_device *cldev = to_mei_cl_device(dev);
+
+ if (!cldev)
+ return;
+
+ mei_me_cl_put(cldev->me_cl);
+ mei_dev_bus_put(cldev->bus);
+ kfree(cldev);
+}
+
+static struct device_type mei_cl_device_type = {
+ .release = mei_cl_bus_dev_release,
+};
+
+/**
+ * mei_cl_bus_set_name - set device name for me client device
+ *
+ * @cldev: me client device
+ */
+static inline void mei_cl_bus_set_name(struct mei_cl_device *cldev)
+{
+ dev_set_name(&cldev->dev, "mei:%s:%pUl:%02X",
+ cldev->name,
+ mei_me_cl_uuid(cldev->me_cl),
+ mei_me_cl_ver(cldev->me_cl));
+}
+
+/**
+ * mei_cl_bus_dev_alloc - initialize and allocate mei client device
+ *
+ * @bus: mei device
+ * @me_cl: me client
+ *
+ * Return: allocated device structur or NULL on allocation failure
+ */
+static struct mei_cl_device *mei_cl_bus_dev_alloc(struct mei_device *bus,
+ struct mei_me_client *me_cl)
+{
+ struct mei_cl_device *cldev;
+
+ cldev = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
+ if (!cldev)
+ return NULL;
+
+ device_initialize(&cldev->dev);
+ cldev->dev.parent = bus->dev;
+ cldev->dev.bus = &mei_cl_bus_type;
+ cldev->dev.type = &mei_cl_device_type;
+ cldev->bus = mei_dev_bus_get(bus);
+ cldev->me_cl = mei_me_cl_get(me_cl);
+ mei_cl_bus_set_name(cldev);
+ cldev->is_added = 0;
+ INIT_LIST_HEAD(&cldev->bus_list);
+
+ return cldev;
+}
+
+/**
+ * mei_cl_dev_setup - setup me client device
+ * run fix up routines and set the device name
+ *
+ * @bus: mei device
+ * @cldev: me client device
+ *
+ * Return: true if the device is eligible for enumeration
+ */
+static bool mei_cl_bus_dev_setup(struct mei_device *bus,
+ struct mei_cl_device *cldev)
+{
+ cldev->do_match = 1;
+ mei_cl_bus_dev_fixup(cldev);
+
+ /* the device name can change during fix up */
+ if (cldev->do_match)
+ mei_cl_bus_set_name(cldev);
+
+ return cldev->do_match == 1;
+}
+
+/**
+ * mei_cl_bus_dev_add - add me client devices
+ *
+ * @cldev: me client device
+ *
+ * Return: 0 on success; < 0 on failre
+ */
+static int mei_cl_bus_dev_add(struct mei_cl_device *cldev)
+{
+ int ret;
+
+ dev_dbg(cldev->bus->dev, "adding %pUL:%02X\n",
+ mei_me_cl_uuid(cldev->me_cl),
+ mei_me_cl_ver(cldev->me_cl));
+ ret = device_add(&cldev->dev);
+ if (!ret)
+ cldev->is_added = 1;
+
+ return ret;
+}
+
+/**
+ * mei_cl_bus_dev_stop - stop the driver
+ *
+ * @cldev: me client device
+ */
+static void mei_cl_bus_dev_stop(struct mei_cl_device *cldev)
+{
+ if (cldev->is_added)
+ device_release_driver(&cldev->dev);
+}
+
+/**
+ * mei_cl_bus_dev_destroy - destroy me client devices object
+ *
+ * @cldev: me client device
+ *
+ * Locking: called under "dev->cl_bus_lock" lock
+ */
+static void mei_cl_bus_dev_destroy(struct mei_cl_device *cldev)
+{
+
+ WARN_ON(!mutex_is_locked(&cldev->bus->cl_bus_lock));
+
+ if (!cldev->is_added)
+ return;
+
+ device_del(&cldev->dev);
+
+ list_del_init(&cldev->bus_list);
+
+ cldev->is_added = 0;
+ put_device(&cldev->dev);
+}
+
+/**
+ * mei_cl_bus_remove_device - remove a devices form the bus
+ *
+ * @cldev: me client device
+ */
+static void mei_cl_bus_remove_device(struct mei_cl_device *cldev)
+{
+ mei_cl_bus_dev_stop(cldev);
+ mei_cl_bus_dev_destroy(cldev);
+}
+
+/**
+ * mei_cl_bus_remove_devices - remove all devices form the bus
+ *
+ * @bus: mei device
+ */
+void mei_cl_bus_remove_devices(struct mei_device *bus)
+{
+ struct mei_cl_device *cldev, *next;
+
+ mutex_lock(&bus->cl_bus_lock);
+ list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list)
+ mei_cl_bus_remove_device(cldev);
+ mutex_unlock(&bus->cl_bus_lock);
+}
+
+
+/**
+ * mei_cl_bus_dev_init - allocate and initializes an mei client devices
+ * based on me client
+ *
+ * @bus: mei device
+ * @me_cl: me client
+ *
+ * Locking: called under "dev->cl_bus_lock" lock
+ */
+static void mei_cl_bus_dev_init(struct mei_device *bus,
+ struct mei_me_client *me_cl)
+{
+ struct mei_cl_device *cldev;
+
+ WARN_ON(!mutex_is_locked(&bus->cl_bus_lock));
+
+ dev_dbg(bus->dev, "initializing %pUl", mei_me_cl_uuid(me_cl));
+
+ if (me_cl->bus_added)
return;
- set_bit(MEI_CL_EVENT_RX, &device->events);
+ cldev = mei_cl_bus_dev_alloc(bus, me_cl);
+ if (!cldev)
+ return;
+
+ me_cl->bus_added = true;
+ list_add_tail(&cldev->bus_list, &bus->device_list);
- schedule_work(&device->event_work);
}
-void mei_cl_bus_remove_devices(struct mei_device *dev)
+/**
+ * mei_cl_bus_rescan - scan me clients list and add create
+ * devices for eligible clients
+ *
+ * @bus: mei device
+ */
+void mei_cl_bus_rescan(struct mei_device *bus)
{
- struct mei_cl *cl, *next;
+ struct mei_cl_device *cldev, *n;
+ struct mei_me_client *me_cl;
+
+ mutex_lock(&bus->cl_bus_lock);
+
+ down_read(&bus->me_clients_rwsem);
+ list_for_each_entry(me_cl, &bus->me_clients, list)
+ mei_cl_bus_dev_init(bus, me_cl);
+ up_read(&bus->me_clients_rwsem);
+
+ list_for_each_entry_safe(cldev, n, &bus->device_list, bus_list) {
- mutex_lock(&dev->device_lock);
- list_for_each_entry_safe(cl, next, &dev->device_list, device_link) {
- if (cl->device)
- mei_cl_remove_device(cl->device);
+ if (!mei_me_cl_is_active(cldev->me_cl)) {
+ mei_cl_bus_remove_device(cldev);
+ continue;
+ }
+
+ if (cldev->is_added)
+ continue;
- list_del(&cl->device_link);
- mei_cl_unlink(cl);
- kfree(cl);
+ if (mei_cl_bus_dev_setup(bus, cldev))
+ mei_cl_bus_dev_add(cldev);
+ else {
+ list_del_init(&cldev->bus_list);
+ put_device(&cldev->dev);
+ }
}
- mutex_unlock(&dev->device_lock);
+ mutex_unlock(&bus->cl_bus_lock);
+
+ dev_dbg(bus->dev, "rescan end");
}
+int __mei_cldev_driver_register(struct mei_cl_driver *cldrv,
+ struct module *owner)
+{
+ int err;
+
+ cldrv->driver.name = cldrv->name;
+ cldrv->driver.owner = owner;
+ cldrv->driver.bus = &mei_cl_bus_type;
+
+ err = driver_register(&cldrv->driver);
+ if (err)
+ return err;
+
+ pr_debug("mei: driver [%s] registered\n", cldrv->driver.name);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__mei_cldev_driver_register);
+
+void mei_cldev_driver_unregister(struct mei_cl_driver *cldrv)
+{
+ driver_unregister(&cldrv->driver);
+
+ pr_debug("mei: driver [%s] unregistered\n", cldrv->driver.name);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_driver_unregister);
+
+
int __init mei_cl_bus_init(void)
{
return bus_register(&mei_cl_bus_type);
Code Review / kvmfornfv.git / blobdiff