diff options
Diffstat (limited to 'drivers/misc/mei/bus.c')
-rw-r--r-- | drivers/misc/mei/bus.c | 1008 |
1 files changed, 676 insertions, 332 deletions
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 458aa5a09c52..eef1c6b46ad8 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -30,276 +30,29 @@ #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; - const uuid_le *uuid; - const char *name; - - if (!device) - return 0; - - uuid = mei_me_cl_uuid(device->me_cl); - name = device->name; - - if (!driver || !driver->id_table) - return 0; - - id = driver->id_table; - - while (uuid_le_cmp(NULL_UUID_LE, id->uuid)) { - - if (!uuid_le_cmp(*uuid, id->uuid)) { - if (id->name[0]) { - if (!strncmp(name, id->name, sizeof(id->name))) - return 1; - } else { - 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, device->name, 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 name_show(struct device *dev, struct device_attribute *a, - char *buf) -{ - struct mei_cl_device *device = to_mei_cl_device(dev); - size_t len; - - len = snprintf(buf, PAGE_SIZE, "%s", device->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 *device = to_mei_cl_device(dev); - const uuid_le *uuid = mei_me_cl_uuid(device->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 modalias_show(struct device *dev, struct device_attribute *a, - char *buf) -{ - struct mei_cl_device *device = to_mei_cl_device(dev); - const uuid_le *uuid = mei_me_cl_uuid(device->me_cl); - size_t len; - - len = snprintf(buf, PAGE_SIZE, "mei:%s:" MEI_CL_UUID_FMT ":", - device->name, MEI_CL_UUID_ARGS(uuid->b)); - - return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; -} -static DEVICE_ATTR_RO(modalias); - -static struct attribute *mei_cl_dev_attrs[] = { - &dev_attr_name.attr, - &dev_attr_uuid.attr, - &dev_attr_modalias.attr, - NULL, -}; -ATTRIBUTE_GROUPS(mei_cl_dev); - -static int mei_cl_uevent(struct device *dev, struct kobj_uevent_env *env) -{ - struct mei_cl_device *device = to_mei_cl_device(dev); - const uuid_le *uuid = mei_me_cl_uuid(device->me_cl); - - if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid)) - return -ENOMEM; - - if (add_uevent_var(env, "MEI_CL_NAME=%s", device->name)) - return -ENOMEM; - - if (add_uevent_var(env, "MODALIAS=mei:%s:" MEI_CL_UUID_FMT ":", - device->name, MEI_CL_UUID_ARGS(uuid->b))) - 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) -{ - struct mei_cl_device *device = to_mei_cl_device(dev); - - if (!device) - return; - - mei_me_cl_put(device->me_cl); - kfree(device); -} - -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 (cl->device && cl->device->me_cl && - !uuid_le_cmp(uuid, *mei_me_cl_uuid(cl->device->me_cl))) - return cl; - } - - return NULL; -} - -struct mei_cl_device *mei_cl_add_device(struct mei_device *dev, - struct mei_me_client *me_cl, - struct mei_cl *cl, - char *name) -{ - struct mei_cl_device *device; - int status; - - device = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL); - if (!device) - return NULL; - - device->me_cl = mei_me_cl_get(me_cl); - if (!device->me_cl) { - kfree(device); - return NULL; - } - - device->cl = cl; - device->dev.parent = dev->dev; - device->dev.bus = &mei_cl_bus_type; - device->dev.type = &mei_cl_device_type; - - strlcpy(device->name, name, sizeof(device->name)); - - dev_set_name(&device->dev, "mei:%s:%pUl", name, mei_me_cl_uuid(me_cl)); - - status = device_register(&device->dev); - if (status) { - dev_err(dev->dev, "Failed to register MEI device\n"); - mei_me_cl_put(device->me_cl); - 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); - +/** + * __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_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; @@ -327,16 +80,25 @@ ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, rets = mei_cl_write(cl, cb, blocking); out: - 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 send + * @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; @@ -344,9 +106,9 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length) 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) @@ -356,9 +118,10 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length) 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)) || @@ -369,7 +132,7 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length) return -ERESTARTSYS; } - mutex_lock(&dev->device_lock); + mutex_lock(&bus->device_lock); if (!mei_cl_is_connected(cl)) { rets = -EBUSY; @@ -396,14 +159,23 @@ copy: free: mei_io_cb_free(cb); out: - mutex_unlock(&dev->device_lock); + mutex_unlock(&bus->device_lock); return rets; } -ssize_t mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length) +/** + * mei_cl_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_cl_send(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; @@ -412,9 +184,18 @@ ssize_t mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length) } EXPORT_SYMBOL_GPL(mei_cl_send); -ssize_t mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length) +/** + * mei_cl_recv - client receive (read) + * + * @cldev: me client device + * @buf: buffer to send + * @length: buffer length + * + * Return: read size in bytes of < 0 on error + */ +ssize_t mei_cl_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; @@ -423,134 +204,697 @@ ssize_t mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length) } EXPORT_SYMBOL_GPL(mei_cl_recv); +/** + * mei_bus_event_work - dispatch rx event for a bus device + * and schedule new work + * + * @work: work + */ static void mei_bus_event_work(struct work_struct *work) { - struct mei_cl_device *device; + struct mei_cl_device *cldev; - device = container_of(work, struct mei_cl_device, event_work); + cldev = container_of(work, struct mei_cl_device, event_work); - if (device->event_cb) - device->event_cb(device, device->events, device->event_context); + if (cldev->event_cb) + cldev->event_cb(cldev, cldev->events, cldev->event_context); - device->events = 0; + cldev->events = 0; /* Prepare for the next read */ - mei_cl_read_start(device->cl, 0, NULL); + if (cldev->events_mask & BIT(MEI_CL_EVENT_RX)) + mei_cl_read_start(cldev->cl, 0, NULL); } -int mei_cl_register_event_cb(struct mei_cl_device *device, +/** + * 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; +} + +/** + * 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 *cldev = cl->cldev; + + 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); +} + +/** + * mei_cl_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_cl_register_event_cb(struct mei_cl_device *cldev, + unsigned long events_mask, mei_cl_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_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); -void *mei_cl_get_drvdata(const struct mei_cl_device *device) +/** + * mei_cl_get_drvdata - driver data getter + * + * @cldev: mei client device + * + * Return: driver private data + */ +void *mei_cl_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); -void mei_cl_set_drvdata(struct mei_cl_device *device, void *data) +/** + * mei_cl_set_drvdata - driver data setter + * + * @cldev: mei client device + * @data: data to store + */ +void mei_cl_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); -int mei_cl_enable_device(struct mei_cl_device *device) +/** + * mei_cl_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_cl_enable_device(struct mei_cl_device *cldev) { - int err; - struct mei_device *dev; - struct mei_cl *cl = device->cl; - - if (cl == NULL) - return -ENODEV; - - dev = cl->dev; - - mutex_lock(&dev->device_lock); + 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; + } + mutex_lock(&bus->device_lock); if (mei_cl_is_connected(cl)) { - mutex_unlock(&dev->device_lock); - dev_warn(dev->dev, "Already connected"); - return -EBUSY; + ret = 0; + goto out; } - err = mei_cl_connect(cl, device->me_cl, NULL); - if (err < 0) { - mutex_unlock(&dev->device_lock); - dev_err(dev->dev, "Could not connect to the ME client"); - - return err; + if (!mei_me_cl_is_active(cldev->me_cl)) { + dev_err(&cldev->dev, "me client is not active\n"); + ret = -ENOTTY; + goto out; } - mutex_unlock(&dev->device_lock); + ret = mei_cl_connect(cl, cldev->me_cl, NULL); + if (ret < 0) + dev_err(&cldev->dev, "cannot connect\n"); - if (device->event_cb) - mei_cl_read_start(device->cl, 0, NULL); +out: + mutex_unlock(&bus->device_lock); - return 0; + return ret; } EXPORT_SYMBOL_GPL(mei_cl_enable_device); -int mei_cl_disable_device(struct mei_cl_device *device) +/** + * mei_cl_disable_device - disable me client device + * disconnect form the me client + * + * @cldev: me client device + * + * Return: 0 on success and < 0 on error + */ +int mei_cl_disable_device(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; - device->event_cb = NULL; + bus = cldev->bus; - mutex_lock(&dev->device_lock); + cldev->event_cb = NULL; + + 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; } 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); - return err; + kfree(cl); + cldev->cl = NULL; + mutex_unlock(&bus->device_lock); + return err; } EXPORT_SYMBOL_GPL(mei_cl_disable_device); -void mei_cl_bus_rx_event(struct mei_cl *cl) +/** + * 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) { - struct mei_cl_device *device = cl->device; + const struct mei_cl_device_id *id; + const uuid_le *uuid; + + uuid = mei_me_cl_uuid(cldev->me_cl); + + id = cldrv->id_table; + while (uuid_le_cmp(NULL_UUID_LE, id->uuid)) { + if (!uuid_le_cmp(*uuid, id->uuid)) { + + if (!cldev->name[0]) + return id; + + if (!strncmp(cldev->name, id->name, sizeof(id->name))) + return id; + } + + id++; + } + + return NULL; +} + +/** + * 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 *cldev = to_mei_cl_device(dev); + size_t len; + + 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 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:" MEI_CL_UUID_FMT ":", + cldev->name, MEI_CL_UUID_ARGS(uuid->b)); + + return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; +} +static DEVICE_ATTR_RO(modalias); + +static struct attribute *mei_cl_dev_attrs[] = { + &dev_attr_name.attr, + &dev_attr_uuid.attr, + &dev_attr_modalias.attr, + NULL, +}; +ATTRIBUTE_GROUPS(mei_cl_dev); + +/** + * 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); + + 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:" MEI_CL_UUID_FMT ":", + cldev->name, MEI_CL_UUID_ARGS(uuid->b))) + return -ENOMEM; - if (!device || !device->event_cb) + 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_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_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_dev_release, +}; + +/** + * mei_cl_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_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); + 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_dev_setup(struct mei_device *bus, + struct mei_cl_device *cldev) +{ + cldev->do_match = 1; + mei_cl_dev_fixup(cldev); + + if (cldev->do_match) + dev_set_name(&cldev->dev, "mei:%s:%pUl", + cldev->name, mei_me_cl_uuid(cldev->me_cl)); + + 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\n", mei_me_cl_uuid(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 + */ +static void mei_cl_bus_dev_destroy(struct mei_cl_device *cldev) +{ + if (!cldev->is_added) + return; + + device_del(&cldev->dev); + + mutex_lock(&cldev->bus->cl_bus_lock); + list_del_init(&cldev->bus_list); + mutex_unlock(&cldev->bus->cl_bus_lock); + + 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; + + list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list) + mei_cl_bus_remove_device(cldev); +} + + +/** + * mei_cl_dev_init - allocate and initializes an mei client devices + * based on me client + * + * @bus: mei device + * @me_cl: me client + */ +static void mei_cl_dev_init(struct mei_device *bus, struct mei_me_client *me_cl) +{ + struct mei_cl_device *cldev; + + 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_dev_alloc(bus, me_cl); + if (!cldev) + return; + + mutex_lock(&cldev->bus->cl_bus_lock); + me_cl->bus_added = true; + list_add_tail(&cldev->bus_list, &bus->device_list); + mutex_unlock(&cldev->bus->cl_bus_lock); + +} + +/** + * 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_device *cldev, *n; + struct mei_me_client *me_cl; + + down_read(&bus->me_clients_rwsem); + list_for_each_entry(me_cl, &bus->me_clients, list) + mei_cl_dev_init(bus, me_cl); + up_read(&bus->me_clients_rwsem); + + mutex_lock(&bus->cl_bus_lock); + list_for_each_entry_safe(cldev, n, &bus->device_list, bus_list) { + + if (!mei_me_cl_is_active(cldev->me_cl)) { + mei_cl_bus_remove_device(cldev); + continue; + } + + if (cldev->is_added) + continue; + + if (mei_cl_dev_setup(bus, cldev)) + mei_cl_bus_dev_add(cldev); + else { + list_del_init(&cldev->bus_list); + put_device(&cldev->dev); + } + } + mutex_unlock(&bus->cl_bus_lock); + + dev_dbg(bus->dev, "rescan end"); +} + +int __mei_cl_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; - schedule_work(&device->event_work); + pr_debug("mei: driver [%s] registered\n", cldrv->driver.name); + + return 0; } +EXPORT_SYMBOL_GPL(__mei_cl_driver_register); + +void mei_cl_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_cl_driver_unregister); + int __init mei_cl_bus_init(void) { |