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author | Alan Stern <stern@rowland.harvard.edu> | 2020-08-21 04:55:44 +0200 |
---|---|---|
committer | Felipe Balbi <balbi@kernel.org> | 2020-10-02 08:57:41 +0200 |
commit | 3301c215a2bb94b5a0afcb444bbe9bf2a395a65d (patch) | |
tree | ac2b2eca3cc6457c171d29af8742b3e1da72c499 /drivers/usb | |
parent | usb: cdns3: gadget: fix some endian issues (diff) | |
download | linux-3301c215a2bb94b5a0afcb444bbe9bf2a395a65d.tar.xz linux-3301c215a2bb94b5a0afcb444bbe9bf2a395a65d.zip |
USB: UDC: Expand device model API interface
The routines used by the UDC core to interface with the kernel's
device model, namely usb_add_gadget_udc(),
usb_add_gadget_udc_release(), and usb_del_gadget_udc(), provide access
to only a subset of the device model's full API. They include
functionality equivalent to device_register() and device_unregister()
for gadgets, but they omit device_initialize(), device_add(),
device_del(), get_device(), and put_device().
This patch expands the UDC API by adding usb_initialize_gadget(),
usb_add_gadget(), usb_del_gadget(), usb_get_gadget(), and
usb_put_gadget() to fill in the gap. It rewrites the existing
routines to call the new ones.
CC: Anton Vasilyev <vasilyev@ispras.ru>
CC: Evgeny Novikov <novikov@ispras.ru>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r-- | drivers/usb/gadget/udc/core.c | 78 |
1 files changed, 63 insertions, 15 deletions
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index 4f82bcd31fd3..2b6770d9fb3f 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -1164,21 +1164,18 @@ static int check_pending_gadget_drivers(struct usb_udc *udc) } /** - * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list + * usb_initialize_gadget - initialize a gadget and its embedded struct device * @parent: the parent device to this udc. Usually the controller driver's * device. - * @gadget: the gadget to be added to the list. + * @gadget: the gadget to be initialized. * @release: a gadget release function. * * Returns zero on success, negative errno otherwise. * Calls the gadget release function in the latter case. */ -int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, +void usb_initialize_gadget(struct device *parent, struct usb_gadget *gadget, void (*release)(struct device *dev)) { - struct usb_udc *udc; - int ret = -ENOMEM; - dev_set_name(&gadget->dev, "gadget"); INIT_WORK(&gadget->work, usb_gadget_state_work); gadget->dev.parent = parent; @@ -1189,17 +1186,32 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, gadget->dev.release = usb_udc_nop_release; device_initialize(&gadget->dev); +} +EXPORT_SYMBOL_GPL(usb_initialize_gadget); + +/** + * usb_add_gadget - adds a new gadget to the udc class driver list + * @gadget: the gadget to be added to the list. + * + * Returns zero on success, negative errno otherwise. + * Does not do a final usb_put_gadget() if an error occurs. + */ +int usb_add_gadget(struct usb_gadget *gadget) +{ + struct usb_udc *udc; + int ret = -ENOMEM; udc = kzalloc(sizeof(*udc), GFP_KERNEL); if (!udc) - goto err_put_gadget; + goto error; device_initialize(&udc->dev); udc->dev.release = usb_udc_release; udc->dev.class = udc_class; udc->dev.groups = usb_udc_attr_groups; - udc->dev.parent = parent; - ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj)); + udc->dev.parent = gadget->dev.parent; + ret = dev_set_name(&udc->dev, "%s", + kobject_name(&gadget->dev.parent->kobj)); if (ret) goto err_put_udc; @@ -1242,8 +1254,30 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, err_put_udc: put_device(&udc->dev); - err_put_gadget: - put_device(&gadget->dev); + error: + return ret; +} +EXPORT_SYMBOL_GPL(usb_add_gadget); + +/** + * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list + * @parent: the parent device to this udc. Usually the controller driver's + * device. + * @gadget: the gadget to be added to the list. + * @release: a gadget release function. + * + * Returns zero on success, negative errno otherwise. + * Calls the gadget release function in the latter case. + */ +int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, + void (*release)(struct device *dev)) +{ + int ret; + + usb_initialize_gadget(parent, gadget, release); + ret = usb_add_gadget(gadget); + if (ret) + usb_put_gadget(gadget); return ret; } EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release); @@ -1311,13 +1345,14 @@ static void usb_gadget_remove_driver(struct usb_udc *udc) } /** - * usb_del_gadget_udc - deletes @udc from udc_list + * usb_del_gadget - deletes @udc from udc_list * @gadget: the gadget to be removed. * - * This, will call usb_gadget_unregister_driver() if + * This will call usb_gadget_unregister_driver() if * the @udc is still busy. + * It will not do a final usb_put_gadget(). */ -void usb_del_gadget_udc(struct usb_gadget *gadget) +void usb_del_gadget(struct usb_gadget *gadget) { struct usb_udc *udc = gadget->udc; @@ -1340,7 +1375,20 @@ void usb_del_gadget_udc(struct usb_gadget *gadget) kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE); flush_work(&gadget->work); device_unregister(&udc->dev); - device_unregister(&gadget->dev); + device_del(&gadget->dev); +} +EXPORT_SYMBOL_GPL(usb_del_gadget); + +/** + * usb_del_gadget_udc - deletes @udc from udc_list + * @gadget: the gadget to be removed. + * + * Calls usb_del_gadget() and does a final usb_put_gadget(). + */ +void usb_del_gadget_udc(struct usb_gadget *gadget) +{ + usb_del_gadget(gadget); + usb_put_gadget(gadget); memset(&gadget->dev, 0x00, sizeof(gadget->dev)); } EXPORT_SYMBOL_GPL(usb_del_gadget_udc); |