diff options
Diffstat (limited to 'drivers/usb/gadget/udc-core.c')
| -rw-r--r-- | drivers/usb/gadget/udc-core.c | 157 |
1 files changed, 63 insertions, 94 deletions
diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c index 4d90a800063..2a9cd369f71 100644 --- a/drivers/usb/gadget/udc-core.c +++ b/drivers/usb/gadget/udc-core.c @@ -102,28 +102,6 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_request); /* ------------------------------------------------------------------------- */ /** - * usb_gadget_start - tells usb device controller to start up - * @gadget: The gadget we want to get started - * @driver: The driver we want to bind to @gadget - * @bind: The bind function for @driver - * - * This call is issued by the UDC Class driver when it's about - * to register a gadget driver to the device controller, before - * calling gadget driver's bind() method. - * - * It allows the controller to be powered off until strictly - * necessary to have it powered on. - * - * Returns zero on success, else negative errno. - */ -static inline int usb_gadget_start(struct usb_gadget *gadget, - struct usb_gadget_driver *driver, - int (*bind)(struct usb_gadget *, struct usb_gadget_driver *)) -{ - return gadget->ops->start(driver, bind); -} - -/** * usb_gadget_udc_start - tells usb device controller to start up * @gadget: The gadget we want to get started * @driver: The driver we want to bind to @gadget @@ -144,24 +122,6 @@ static inline int usb_gadget_udc_start(struct usb_gadget *gadget, } /** - * usb_gadget_stop - tells usb device controller we don't need it anymore - * @gadget: The device we want to stop activity - * @driver: The driver to unbind from @gadget - * - * This call is issued by the UDC Class driver after calling - * gadget driver's unbind() method. - * - * The details are implementation specific, but it can go as - * far as powering off UDC completely and disable its data - * line pullups. - */ -static inline void usb_gadget_stop(struct usb_gadget *gadget, - struct usb_gadget_driver *driver) -{ - gadget->ops->stop(driver); -} - -/** * usb_gadget_udc_stop - tells usb device controller we don't need it anymore * @gadget: The device we want to stop activity * @driver: The driver to unbind from @gadget @@ -246,14 +206,6 @@ err1: } EXPORT_SYMBOL_GPL(usb_add_gadget_udc); -static int udc_is_newstyle(struct usb_udc *udc) -{ - if (udc->gadget->ops->udc_start && udc->gadget->ops->udc_stop) - return 1; - return 0; -} - - static void usb_gadget_remove_driver(struct usb_udc *udc) { dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n", @@ -261,14 +213,10 @@ static void usb_gadget_remove_driver(struct usb_udc *udc) kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); - if (udc_is_newstyle(udc)) { - usb_gadget_disconnect(udc->gadget); - udc->driver->disconnect(udc->gadget); - udc->driver->unbind(udc->gadget); - usb_gadget_udc_stop(udc->gadget, udc->driver); - } else { - usb_gadget_stop(udc->gadget, udc->driver); - } + usb_gadget_disconnect(udc->gadget); + udc->driver->disconnect(udc->gadget); + udc->driver->unbind(udc->gadget); + usb_gadget_udc_stop(udc->gadget, udc->driver); udc->driver = NULL; udc->dev.driver = NULL; @@ -311,6 +259,62 @@ EXPORT_SYMBOL_GPL(usb_del_gadget_udc); /* ------------------------------------------------------------------------- */ +static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver) +{ + int ret; + + dev_dbg(&udc->dev, "registering UDC driver [%s]\n", + driver->function); + + udc->driver = driver; + udc->dev.driver = &driver->driver; + + ret = driver->bind(udc->gadget, driver); + if (ret) + goto err1; + ret = usb_gadget_udc_start(udc->gadget, driver); + if (ret) { + driver->unbind(udc->gadget); + goto err1; + } + usb_gadget_connect(udc->gadget); + + kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); + return 0; +err1: + dev_err(&udc->dev, "failed to start %s: %d\n", + udc->driver->function, ret); + udc->driver = NULL; + udc->dev.driver = NULL; + return ret; +} + +int udc_attach_driver(const char *name, struct usb_gadget_driver *driver) +{ + struct usb_udc *udc = NULL; + int ret = -ENODEV; + + mutex_lock(&udc_lock); + list_for_each_entry(udc, &udc_list, list) { + ret = strcmp(name, dev_name(&udc->dev)); + if (!ret) + break; + } + if (ret) { + ret = -ENODEV; + goto out; + } + if (udc->driver) { + ret = -EBUSY; + goto out; + } + ret = udc_bind_to_driver(udc, driver); +out: + mutex_unlock(&udc_lock); + return ret; +} +EXPORT_SYMBOL_GPL(udc_attach_driver); + int usb_gadget_probe_driver(struct usb_gadget_driver *driver) { struct usb_udc *udc = NULL; @@ -329,41 +333,8 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver) pr_debug("couldn't find an available UDC\n"); mutex_unlock(&udc_lock); return -ENODEV; - found: - dev_dbg(&udc->dev, "registering UDC driver [%s]\n", - driver->function); - - udc->driver = driver; - udc->dev.driver = &driver->driver; - - if (udc_is_newstyle(udc)) { - ret = driver->bind(udc->gadget, driver); - if (ret) - goto err1; - ret = usb_gadget_udc_start(udc->gadget, driver); - if (ret) { - driver->unbind(udc->gadget); - goto err1; - } - usb_gadget_connect(udc->gadget); - } else { - - ret = usb_gadget_start(udc->gadget, driver, driver->bind); - if (ret) - goto err1; - - } - - kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); - mutex_unlock(&udc_lock); - return 0; - -err1: - dev_err(&udc->dev, "failed to start %s: %d\n", - udc->driver->function, ret); - udc->driver = NULL; - udc->dev.driver = NULL; + ret = udc_bind_to_driver(udc, driver); mutex_unlock(&udc_lock); return ret; } @@ -410,13 +381,11 @@ static ssize_t usb_udc_softconn_store(struct device *dev, struct usb_udc *udc = container_of(dev, struct usb_udc, dev); if (sysfs_streq(buf, "connect")) { - if (udc_is_newstyle(udc)) - usb_gadget_udc_start(udc->gadget, udc->driver); + usb_gadget_udc_start(udc->gadget, udc->driver); usb_gadget_connect(udc->gadget); } else if (sysfs_streq(buf, "disconnect")) { usb_gadget_disconnect(udc->gadget); - if (udc_is_newstyle(udc)) - usb_gadget_udc_stop(udc->gadget, udc->driver); + usb_gadget_udc_stop(udc->gadget, udc->driver); } else { dev_err(dev, "unsupported command '%s'\n", buf); return -EINVAL; |