369 lines
9.1 KiB
C
369 lines
9.1 KiB
C
/**
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* udc.c - Core UDC Framework
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*
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* Copyright (C) 2010 Texas Instruments
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* Author: Felipe Balbi <balbi@ti.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define VERBOSE_DEBUG
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#include <common.h>
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#include <driver.h>
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#include <init.h>
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#include <usb/ch9.h>
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#include <usb/gadget.h>
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/**
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* struct usb_udc - describes one usb device controller
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* @driver - the gadget driver pointer. For use by the class code
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* @dev - the child device to the actual controller
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* @gadget - the gadget. For use by the class code
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* @list - for use by the udc class driver
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*
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* This represents the internal data structure which is used by the UDC-class
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* to hold information about udc driver and gadget together.
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*/
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struct usb_udc {
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struct usb_gadget_driver *driver;
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struct usb_gadget *gadget;
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struct device_d dev;
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struct list_head list;
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};
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static LIST_HEAD(udc_list);
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/* ------------------------------------------------------------------------- */
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#ifdef CONFIG_KERNEL_HAS_DMA
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int usb_gadget_map_request(struct usb_gadget *gadget,
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struct usb_request *req, int is_in)
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{
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if (req->length == 0)
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return 0;
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if (req->num_sgs) {
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int mapped;
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mapped = dma_map_sg(&gadget->dev, req->sg, req->num_sgs,
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is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
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if (mapped == 0) {
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dev_err(&gadget->dev, "failed to map SGs\n");
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return -EFAULT;
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}
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req->num_mapped_sgs = mapped;
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} else {
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req->dma = dma_map_single(&gadget->dev, req->buf, req->length,
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is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
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if (dma_mapping_error(&gadget->dev, req->dma)) {
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dev_err(&gadget->dev, "failed to map buffer\n");
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return -EFAULT;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_map_request);
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void usb_gadget_unmap_request(struct usb_gadget *gadget,
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struct usb_request *req, int is_in)
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{
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if (req->length == 0)
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return;
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if (req->num_mapped_sgs) {
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dma_unmap_sg(&gadget->dev, req->sg, req->num_mapped_sgs,
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is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
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req->num_mapped_sgs = 0;
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} else {
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dma_unmap_single(&gadget->dev, req->dma, req->length,
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is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
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}
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}
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EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
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#endif /* CONFIG_HAS_DMA */
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/* ------------------------------------------------------------------------- */
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void usb_gadget_set_state(struct usb_gadget *gadget,
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enum usb_device_state state)
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{
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gadget->state = state;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_set_state);
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/* ------------------------------------------------------------------------- */
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/**
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* usb_gadget_udc_start - tells usb device controller to start up
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* @gadget: The gadget we want to get started
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* @driver: The driver we want to bind to @gadget
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*
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* This call is issued by the UDC Class driver when it's about
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* to register a gadget driver to the device controller, before
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* calling gadget driver's bind() method.
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*
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* It allows the controller to be powered off until strictly
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* necessary to have it powered on.
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*
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* Returns zero on success, else negative errno.
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*/
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static inline int usb_gadget_udc_start(struct usb_gadget *gadget,
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struct usb_gadget_driver *driver)
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{
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return gadget->ops->udc_start(gadget, driver);
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}
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/**
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* usb_gadget_udc_stop - tells usb device controller we don't need it anymore
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* @gadget: The device we want to stop activity
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* @driver: The driver to unbind from @gadget
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*
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* This call is issued by the UDC Class driver after calling
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* gadget driver's unbind() method.
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*
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* The details are implementation specific, but it can go as
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* far as powering off UDC completely and disable its data
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* line pullups.
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*/
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static inline void usb_gadget_udc_stop(struct usb_gadget *gadget,
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struct usb_gadget_driver *driver)
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{
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gadget->ops->udc_stop(gadget, driver);
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}
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/**
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* usb_add_gadget_udc_release - adds a new gadget to the udc class driver list
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* @parent: the parent device to this udc. Usually the controller driver's
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* device.
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* @gadget: the gadget to be added to the list.
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* @release: a gadget release function.
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*
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* Returns zero on success, negative errno otherwise.
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*/
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int usb_add_gadget_udc_release(struct device_d *parent, struct usb_gadget *gadget,
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void (*release)(struct device_d *dev))
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{
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struct usb_udc *udc;
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int ret = -ENOMEM;
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udc = kzalloc(sizeof(*udc), GFP_KERNEL);
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if (!udc)
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goto err1;
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strcpy(gadget->dev.name, "usbgadget");
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gadget->dev.id = DEVICE_ID_SINGLE;
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gadget->dev.parent = parent;
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ret = register_device(&gadget->dev);
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if (ret)
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goto err2;
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dev_add_param_int(&gadget->dev, "product", NULL, NULL,
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&gadget->product_id, "0x%04x", NULL);
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dev_add_param_int(&gadget->dev, "vendor", NULL, NULL,
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&gadget->vendor_id, "0x%04x", NULL);
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gadget->manufacturer = xstrdup("barebox");
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dev_add_param_string(&gadget->dev, "manufacturer", NULL, NULL,
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&gadget->manufacturer, NULL);
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gadget->productname = xstrdup(barebox_get_model());
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dev_add_param_string(&gadget->dev, "productname", NULL, NULL,
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&gadget->productname, NULL);
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strcpy(udc->dev.name, "udc");
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udc->dev.id = DEVICE_ID_DYNAMIC;
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udc->gadget = gadget;
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list_add_tail(&udc->list, &udc_list);
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register_device(&udc->dev);
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usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
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return 0;
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err2:
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kfree(udc);
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err1:
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release);
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/**
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* usb_add_gadget_udc - adds a new gadget to the udc class driver list
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* @parent: the parent device to this udc. Usually the controller
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* driver's device.
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* @gadget: the gadget to be added to the list
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*
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* Returns zero on success, negative errno otherwise.
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*/
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int usb_add_gadget_udc(struct device_d *parent, struct usb_gadget *gadget)
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{
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return usb_add_gadget_udc_release(parent, gadget, NULL);
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}
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EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
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static void usb_gadget_remove_driver(struct usb_udc *udc)
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{
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dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
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udc->gadget->name);
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usb_gadget_disconnect(udc->gadget);
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udc->driver->disconnect(udc->gadget);
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udc->driver->unbind(udc->gadget);
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usb_gadget_udc_stop(udc->gadget, NULL);
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udc->driver = NULL;
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udc->dev.driver = NULL;
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udc->gadget->dev.driver = NULL;
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}
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/**
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* usb_del_gadget_udc - deletes @udc from udc_list
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* @gadget: the gadget to be removed.
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*
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* This, will call usb_gadget_unregister_driver() if
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* the @udc is still busy.
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*/
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void usb_del_gadget_udc(struct usb_gadget *gadget)
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{
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struct usb_udc *udc = NULL;
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list_for_each_entry(udc, &udc_list, list)
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if (udc->gadget == gadget)
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goto found;
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dev_err(gadget->dev.parent, "gadget not registered.\n");
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return;
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found:
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dev_vdbg(gadget->dev.parent, "unregistering gadget\n");
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list_del(&udc->list);
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if (udc->driver)
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usb_gadget_remove_driver(udc);
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unregister_device(&udc->dev);
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unregister_device(&gadget->dev);
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}
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EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
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/* ------------------------------------------------------------------------- */
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static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver)
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{
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int ret;
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dev_dbg(&udc->dev, "registering UDC driver [%s]\n",
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driver->function);
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udc->driver = driver;
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udc->dev.driver = &driver->driver;
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udc->gadget->dev.driver = &driver->driver;
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ret = driver->bind(udc->gadget, driver);
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if (ret)
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goto err1;
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ret = usb_gadget_udc_start(udc->gadget, driver);
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if (ret) {
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driver->unbind(udc->gadget);
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goto err1;
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}
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usb_gadget_connect(udc->gadget);
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return 0;
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err1:
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if (ret != -EISNAM)
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dev_err(&udc->dev, "failed to start %s: %d\n",
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udc->driver->function, ret);
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udc->driver = NULL;
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udc->dev.driver = NULL;
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udc->gadget->dev.driver = NULL;
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return ret;
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}
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int udc_attach_driver(const char *name, struct usb_gadget_driver *driver)
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{
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struct usb_udc *udc = NULL;
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int ret = -ENODEV;
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list_for_each_entry(udc, &udc_list, list) {
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ret = strcmp(name, dev_name(&udc->dev));
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if (!ret)
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break;
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}
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if (ret) {
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ret = -ENODEV;
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goto out;
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}
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if (udc->driver) {
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ret = -EBUSY;
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goto out;
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}
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ret = udc_bind_to_driver(udc, driver);
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out:
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return ret;
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}
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EXPORT_SYMBOL_GPL(udc_attach_driver);
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int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
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{
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struct usb_udc *udc = NULL;
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int ret;
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if (!driver || !driver->bind || !driver->setup)
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return -EINVAL;
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list_for_each_entry(udc, &udc_list, list) {
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/* For now we take the first one */
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if (!udc->driver)
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goto found;
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}
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pr_debug("couldn't find an available UDC\n");
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return -ENODEV;
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found:
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ret = udc_bind_to_driver(udc, driver);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_probe_driver);
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int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
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{
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struct usb_udc *udc = NULL;
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int ret = -ENODEV;
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if (!driver || !driver->unbind)
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return -EINVAL;
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list_for_each_entry(udc, &udc_list, list)
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if (udc->driver == driver) {
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usb_gadget_remove_driver(udc);
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ret = 0;
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break;
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver);
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