492 lines
12 KiB
C
492 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* f_obex.c -- USB CDC OBEX function driver
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*
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* Copyright (C) 2008 Nokia Corporation
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* Contact: Felipe Balbi <felipe.balbi@nokia.com>
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*
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* Based on f_acm.c by Al Borchers and David Brownell.
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*/
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/* #define VERBOSE_DEBUG */
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include "u_serial.h"
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/*
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* This CDC OBEX function support just packages a TTY-ish byte stream.
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* A user mode server will put it into "raw" mode and handle all the
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* relevant protocol details ... this is just a kernel passthrough.
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* When possible, we prevent gadget enumeration until that server is
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* ready to handle the commands.
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*/
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struct f_obex {
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struct gserial port;
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u8 ctrl_id;
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u8 data_id;
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u8 cur_alt;
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u8 port_num;
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};
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static inline struct f_obex *func_to_obex(struct usb_function *f)
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{
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return container_of(f, struct f_obex, port.func);
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}
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static inline struct f_obex *port_to_obex(struct gserial *p)
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{
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return container_of(p, struct f_obex, port);
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}
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/*-------------------------------------------------------------------------*/
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#define OBEX_CTRL_IDX 0
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#define OBEX_DATA_IDX 1
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static struct usb_string obex_string_defs[] = {
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[OBEX_CTRL_IDX].s = "CDC Object Exchange (OBEX)",
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[OBEX_DATA_IDX].s = "CDC OBEX Data",
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{ }, /* end of list */
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};
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static struct usb_gadget_strings obex_string_table = {
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.language = 0x0409, /* en-US */
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.strings = obex_string_defs,
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};
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static struct usb_gadget_strings *obex_strings[] = {
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&obex_string_table,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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static struct usb_interface_descriptor obex_control_intf = {
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.bLength = sizeof(obex_control_intf),
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 0,
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.bAlternateSetting = 0,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_COMM,
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.bInterfaceSubClass = USB_CDC_SUBCLASS_OBEX,
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};
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static struct usb_interface_descriptor obex_data_nop_intf = {
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.bLength = sizeof(obex_data_nop_intf),
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 1,
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.bAlternateSetting = 0,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_CDC_DATA,
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};
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static struct usb_interface_descriptor obex_data_intf = {
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.bLength = sizeof(obex_data_intf),
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 2,
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.bAlternateSetting = 1,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_CDC_DATA,
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};
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static struct usb_cdc_header_desc obex_cdc_header_desc = {
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.bLength = sizeof(obex_cdc_header_desc),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_CDC_HEADER_TYPE,
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.bcdCDC = cpu_to_le16(0x0120),
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};
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static struct usb_cdc_union_desc obex_cdc_union_desc = {
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.bLength = sizeof(obex_cdc_union_desc),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_CDC_UNION_TYPE,
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.bMasterInterface0 = 1,
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.bSlaveInterface0 = 2,
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};
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static struct usb_cdc_obex_desc obex_desc = {
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.bLength = sizeof(obex_desc),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_CDC_OBEX_TYPE,
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.bcdVersion = cpu_to_le16(0x0100),
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};
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/* High-Speed Support */
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static struct usb_endpoint_descriptor obex_hs_ep_out_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = cpu_to_le16(512),
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};
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static struct usb_endpoint_descriptor obex_hs_ep_in_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = cpu_to_le16(512),
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};
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static struct usb_descriptor_header *hs_function[] = {
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(struct usb_descriptor_header *) &obex_control_intf,
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(struct usb_descriptor_header *) &obex_cdc_header_desc,
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(struct usb_descriptor_header *) &obex_desc,
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(struct usb_descriptor_header *) &obex_cdc_union_desc,
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(struct usb_descriptor_header *) &obex_data_nop_intf,
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(struct usb_descriptor_header *) &obex_data_intf,
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(struct usb_descriptor_header *) &obex_hs_ep_in_desc,
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(struct usb_descriptor_header *) &obex_hs_ep_out_desc,
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NULL,
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};
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/* Full-Speed Support */
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static struct usb_endpoint_descriptor obex_fs_ep_in_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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};
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static struct usb_endpoint_descriptor obex_fs_ep_out_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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};
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static struct usb_descriptor_header *fs_function[] = {
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(struct usb_descriptor_header *) &obex_control_intf,
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(struct usb_descriptor_header *) &obex_cdc_header_desc,
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(struct usb_descriptor_header *) &obex_desc,
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(struct usb_descriptor_header *) &obex_cdc_union_desc,
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(struct usb_descriptor_header *) &obex_data_nop_intf,
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(struct usb_descriptor_header *) &obex_data_intf,
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(struct usb_descriptor_header *) &obex_fs_ep_in_desc,
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(struct usb_descriptor_header *) &obex_fs_ep_out_desc,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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static int obex_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
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{
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struct f_obex *obex = func_to_obex(f);
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struct usb_composite_dev *cdev = f->config->cdev;
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if (intf == obex->ctrl_id) {
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if (alt != 0)
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goto fail;
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/* NOP */
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dev_dbg(&cdev->gadget->dev,
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"reset obex ttyGS%d control\n", obex->port_num);
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} else if (intf == obex->data_id) {
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if (alt > 1)
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goto fail;
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if (obex->port.in->enabled) {
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dev_dbg(&cdev->gadget->dev,
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"reset obex ttyGS%d\n", obex->port_num);
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gserial_disconnect(&obex->port);
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}
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if (!obex->port.in->desc || !obex->port.out->desc) {
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dev_dbg(&cdev->gadget->dev,
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"init obex ttyGS%d\n", obex->port_num);
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if (config_ep_by_speed(cdev->gadget, f,
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obex->port.in) ||
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config_ep_by_speed(cdev->gadget, f,
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obex->port.out)) {
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obex->port.out->desc = NULL;
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obex->port.in->desc = NULL;
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goto fail;
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}
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}
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if (alt == 1) {
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dev_dbg(&cdev->gadget->dev,
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"activate obex ttyGS%d\n", obex->port_num);
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gserial_connect(&obex->port, obex->port_num);
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}
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} else
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goto fail;
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obex->cur_alt = alt;
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return 0;
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fail:
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return -EINVAL;
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}
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static int obex_get_alt(struct usb_function *f, unsigned intf)
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{
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struct f_obex *obex = func_to_obex(f);
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return obex->cur_alt;
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}
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static void obex_disable(struct usb_function *f)
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{
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struct f_obex *obex = func_to_obex(f);
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struct usb_composite_dev *cdev = f->config->cdev;
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dev_dbg(&cdev->gadget->dev, "obex ttyGS%d disable\n", obex->port_num);
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gserial_disconnect(&obex->port);
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}
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/*-------------------------------------------------------------------------*/
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static void obex_connect(struct gserial *g)
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{
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struct f_obex *obex = port_to_obex(g);
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struct usb_composite_dev *cdev = g->func.config->cdev;
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int status;
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status = usb_function_activate(&g->func);
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if (status)
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dev_dbg(&cdev->gadget->dev,
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"obex ttyGS%d function activate --> %d\n",
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obex->port_num, status);
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}
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static void obex_disconnect(struct gserial *g)
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{
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struct f_obex *obex = port_to_obex(g);
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struct usb_composite_dev *cdev = g->func.config->cdev;
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int status;
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status = usb_function_deactivate(&g->func);
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if (status)
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dev_dbg(&cdev->gadget->dev,
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"obex ttyGS%d function deactivate --> %d\n",
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obex->port_num, status);
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}
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/*-------------------------------------------------------------------------*/
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/* Some controllers can't support CDC OBEX ... */
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static inline bool can_support_obex(struct usb_configuration *c)
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{
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/* Since the first interface is a NOP, we can ignore the
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* issue of multi-interface support on most controllers.
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*
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* Altsettings are mandatory, however...
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*/
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if (!gadget_is_altset_supported(c->cdev->gadget))
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return false;
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/* everything else is *probably* fine ... */
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return true;
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}
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static int obex_bind(struct usb_configuration *c, struct usb_function *f)
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{
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struct usb_composite_dev *cdev = c->cdev;
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struct f_obex *obex = func_to_obex(f);
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struct usb_string *us;
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int status;
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struct usb_ep *ep;
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if (!can_support_obex(c))
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return -EINVAL;
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us = usb_gstrings_attach(cdev, obex_strings,
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ARRAY_SIZE(obex_string_defs));
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if (IS_ERR(us))
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return PTR_ERR(us);
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obex_control_intf.iInterface = us[OBEX_CTRL_IDX].id;
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obex_data_nop_intf.iInterface = us[OBEX_DATA_IDX].id;
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obex_data_intf.iInterface = us[OBEX_DATA_IDX].id;
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/* allocate instance-specific interface IDs, and patch descriptors */
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status = usb_interface_id(c, f);
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if (status < 0)
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goto fail;
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obex->ctrl_id = status;
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obex_control_intf.bInterfaceNumber = status;
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obex_cdc_union_desc.bMasterInterface0 = status;
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status = usb_interface_id(c, f);
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if (status < 0)
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goto fail;
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obex->data_id = status;
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obex_data_nop_intf.bInterfaceNumber = status;
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obex_data_intf.bInterfaceNumber = status;
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obex_cdc_union_desc.bSlaveInterface0 = status;
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/* allocate instance-specific endpoints */
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status = -ENODEV;
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ep = usb_ep_autoconfig(cdev->gadget, &obex_fs_ep_in_desc);
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if (!ep)
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goto fail;
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obex->port.in = ep;
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ep = usb_ep_autoconfig(cdev->gadget, &obex_fs_ep_out_desc);
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if (!ep)
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goto fail;
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obex->port.out = ep;
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/* support all relevant hardware speeds... we expect that when
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* hardware is dual speed, all bulk-capable endpoints work at
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* both speeds
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*/
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obex_hs_ep_in_desc.bEndpointAddress =
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obex_fs_ep_in_desc.bEndpointAddress;
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obex_hs_ep_out_desc.bEndpointAddress =
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obex_fs_ep_out_desc.bEndpointAddress;
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status = usb_assign_descriptors(f, fs_function, hs_function, NULL,
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NULL);
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if (status)
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goto fail;
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dev_dbg(&cdev->gadget->dev, "obex ttyGS%d: %s speed IN/%s OUT/%s\n",
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obex->port_num,
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gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
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obex->port.in->name, obex->port.out->name);
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return 0;
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fail:
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ERROR(cdev, "%s/%p: can't bind, err %d\n", f->name, f, status);
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return status;
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}
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static inline struct f_serial_opts *to_f_serial_opts(struct config_item *item)
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{
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return container_of(to_config_group(item), struct f_serial_opts,
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func_inst.group);
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}
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static void obex_attr_release(struct config_item *item)
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{
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struct f_serial_opts *opts = to_f_serial_opts(item);
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usb_put_function_instance(&opts->func_inst);
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}
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static struct configfs_item_operations obex_item_ops = {
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.release = obex_attr_release,
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};
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static ssize_t f_obex_port_num_show(struct config_item *item, char *page)
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{
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return sprintf(page, "%u\n", to_f_serial_opts(item)->port_num);
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}
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CONFIGFS_ATTR_RO(f_obex_, port_num);
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static struct configfs_attribute *acm_attrs[] = {
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&f_obex_attr_port_num,
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NULL,
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};
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static const struct config_item_type obex_func_type = {
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.ct_item_ops = &obex_item_ops,
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.ct_attrs = acm_attrs,
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.ct_owner = THIS_MODULE,
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};
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static void obex_free_inst(struct usb_function_instance *f)
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{
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struct f_serial_opts *opts;
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opts = container_of(f, struct f_serial_opts, func_inst);
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gserial_free_line(opts->port_num);
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kfree(opts);
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}
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static struct usb_function_instance *obex_alloc_inst(void)
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{
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struct f_serial_opts *opts;
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int ret;
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opts = kzalloc(sizeof(*opts), GFP_KERNEL);
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if (!opts)
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return ERR_PTR(-ENOMEM);
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opts->func_inst.free_func_inst = obex_free_inst;
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ret = gserial_alloc_line_no_console(&opts->port_num);
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if (ret) {
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kfree(opts);
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return ERR_PTR(ret);
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}
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config_group_init_type_name(&opts->func_inst.group, "",
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&obex_func_type);
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return &opts->func_inst;
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}
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static void obex_free(struct usb_function *f)
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{
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struct f_obex *obex;
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obex = func_to_obex(f);
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kfree(obex);
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}
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static void obex_unbind(struct usb_configuration *c, struct usb_function *f)
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{
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usb_free_all_descriptors(f);
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}
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static struct usb_function *obex_alloc(struct usb_function_instance *fi)
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{
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struct f_obex *obex;
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struct f_serial_opts *opts;
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/* allocate and initialize one new instance */
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obex = kzalloc(sizeof(*obex), GFP_KERNEL);
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if (!obex)
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return ERR_PTR(-ENOMEM);
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opts = container_of(fi, struct f_serial_opts, func_inst);
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obex->port_num = opts->port_num;
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obex->port.connect = obex_connect;
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obex->port.disconnect = obex_disconnect;
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obex->port.func.name = "obex";
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/* descriptors are per-instance copies */
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obex->port.func.bind = obex_bind;
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obex->port.func.unbind = obex_unbind;
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obex->port.func.set_alt = obex_set_alt;
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obex->port.func.get_alt = obex_get_alt;
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obex->port.func.disable = obex_disable;
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obex->port.func.free_func = obex_free;
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obex->port.func.bind_deactivated = true;
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return &obex->port.func;
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}
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DECLARE_USB_FUNCTION_INIT(obex, obex_alloc_inst, obex_alloc);
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MODULE_AUTHOR("Felipe Balbi");
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MODULE_LICENSE("GPL");
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