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@ -1,808 +0,0 @@
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/*
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* Gadget Function Driver for Android USB accessories
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*
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* Copyright (C) 2011 Google, Inc.
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* Author: Mike Lockwood <lockwood@android.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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/* #define DEBUG */
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/* #define VERBOSE_DEBUG */
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/delay.h>
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#include <linux/wait.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <linux/types.h>
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#include <linux/file.h>
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#include <linux/device.h>
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#include <linux/miscdevice.h>
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#include <linux/usb.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/android_composite.h>
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#include <linux/usb/f_accessory.h>
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#define BULK_BUFFER_SIZE 16384
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#define ACC_STRING_SIZE 256
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#define PROTOCOL_VERSION 1
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/* String IDs */
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#define INTERFACE_STRING_INDEX 0
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/* number of tx and rx requests to allocate */
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#define TX_REQ_MAX 4
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#define RX_REQ_MAX 2
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struct acc_dev {
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struct usb_function function;
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struct usb_composite_dev *cdev;
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spinlock_t lock;
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struct usb_ep *ep_in;
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struct usb_ep *ep_out;
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/* set to 1 when we connect */
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int online:1;
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/* Set to 1 when we disconnect.
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* Not cleared until our file is closed.
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*/
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int disconnected:1;
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/* strings sent by the host */
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char manufacturer[ACC_STRING_SIZE];
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char model[ACC_STRING_SIZE];
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char description[ACC_STRING_SIZE];
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char version[ACC_STRING_SIZE];
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char uri[ACC_STRING_SIZE];
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char serial[ACC_STRING_SIZE];
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/* for acc_complete_set_string */
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int string_index;
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/* synchronize access to our device file */
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atomic_t open_excl;
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struct list_head tx_idle;
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wait_queue_head_t read_wq;
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wait_queue_head_t write_wq;
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struct usb_request *rx_req[RX_REQ_MAX];
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int rx_done;
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struct delayed_work work;
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};
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static struct usb_interface_descriptor acc_interface_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 0,
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.bNumEndpoints = 3,
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
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.bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC,
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.bInterfaceProtocol = 0,
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};
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static struct usb_endpoint_descriptor acc_highspeed_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 = __constant_cpu_to_le16(512),
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};
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static struct usb_endpoint_descriptor acc_highspeed_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 = __constant_cpu_to_le16(512),
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};
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static struct usb_endpoint_descriptor acc_fullspeed_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 acc_fullspeed_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_acc_descs[] = {
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(struct usb_descriptor_header *) &acc_interface_desc,
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(struct usb_descriptor_header *) &acc_fullspeed_in_desc,
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(struct usb_descriptor_header *) &acc_fullspeed_out_desc,
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NULL,
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};
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static struct usb_descriptor_header *hs_acc_descs[] = {
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(struct usb_descriptor_header *) &acc_interface_desc,
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(struct usb_descriptor_header *) &acc_highspeed_in_desc,
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(struct usb_descriptor_header *) &acc_highspeed_out_desc,
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NULL,
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};
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static struct usb_string acc_string_defs[] = {
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[INTERFACE_STRING_INDEX].s = "Android Accessory Interface",
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{ }, /* end of list */
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};
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static struct usb_gadget_strings acc_string_table = {
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.language = 0x0409, /* en-US */
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.strings = acc_string_defs,
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};
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static struct usb_gadget_strings *acc_strings[] = {
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&acc_string_table,
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NULL,
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};
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/* temporary variable used between acc_open() and acc_gadget_bind() */
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static struct acc_dev *_acc_dev;
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static inline struct acc_dev *func_to_dev(struct usb_function *f)
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{
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return container_of(f, struct acc_dev, function);
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}
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static struct usb_request *acc_request_new(struct usb_ep *ep, int buffer_size)
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{
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struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
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if (!req)
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return NULL;
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/* now allocate buffers for the requests */
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req->buf = kmalloc(buffer_size, GFP_KERNEL);
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if (!req->buf) {
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usb_ep_free_request(ep, req);
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return NULL;
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}
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return req;
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}
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static void acc_request_free(struct usb_request *req, struct usb_ep *ep)
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{
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if (req) {
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kfree(req->buf);
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usb_ep_free_request(ep, req);
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}
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}
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/* add a request to the tail of a list */
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static void req_put(struct acc_dev *dev, struct list_head *head,
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struct usb_request *req)
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{
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unsigned long flags;
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spin_lock_irqsave(&dev->lock, flags);
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list_add_tail(&req->list, head);
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spin_unlock_irqrestore(&dev->lock, flags);
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}
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/* remove a request from the head of a list */
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static struct usb_request *req_get(struct acc_dev *dev, struct list_head *head)
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{
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unsigned long flags;
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struct usb_request *req;
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spin_lock_irqsave(&dev->lock, flags);
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if (list_empty(head)) {
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req = 0;
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} else {
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req = list_first_entry(head, struct usb_request, list);
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list_del(&req->list);
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}
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spin_unlock_irqrestore(&dev->lock, flags);
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return req;
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}
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static void acc_set_disconnected(struct acc_dev *dev)
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{
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dev->online = 0;
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dev->disconnected = 1;
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}
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static void acc_complete_in(struct usb_ep *ep, struct usb_request *req)
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{
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struct acc_dev *dev = _acc_dev;
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if (req->status != 0)
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acc_set_disconnected(dev);
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req_put(dev, &dev->tx_idle, req);
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wake_up(&dev->write_wq);
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}
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static void acc_complete_out(struct usb_ep *ep, struct usb_request *req)
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{
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struct acc_dev *dev = _acc_dev;
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dev->rx_done = 1;
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if (req->status != 0)
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acc_set_disconnected(dev);
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wake_up(&dev->read_wq);
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}
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static void acc_complete_set_string(struct usb_ep *ep, struct usb_request *req)
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{
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struct acc_dev *dev = ep->driver_data;
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struct usb_composite_dev *cdev = dev->cdev;
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char *string_dest = NULL;
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int length = req->actual;
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if (req->status != 0) {
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DBG(cdev, "acc_complete_set_string, err %d\n", req->status);
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return;
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}
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switch (dev->string_index) {
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case ACCESSORY_STRING_MANUFACTURER:
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string_dest = dev->manufacturer;
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break;
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case ACCESSORY_STRING_MODEL:
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string_dest = dev->model;
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break;
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case ACCESSORY_STRING_DESCRIPTION:
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string_dest = dev->description;
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break;
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case ACCESSORY_STRING_VERSION:
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string_dest = dev->version;
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break;
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case ACCESSORY_STRING_URI:
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string_dest = dev->uri;
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break;
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case ACCESSORY_STRING_SERIAL:
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string_dest = dev->serial;
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break;
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}
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if (string_dest) {
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unsigned long flags;
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if (length >= ACC_STRING_SIZE)
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length = ACC_STRING_SIZE - 1;
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spin_lock_irqsave(&dev->lock, flags);
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memcpy(string_dest, cdev->req->buf, length);
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/* ensure zero termination */
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string_dest[length] = 0;
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spin_unlock_irqrestore(&dev->lock, flags);
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} else {
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DBG(cdev, "unknown accessory string index %d\n",
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dev->string_index);
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}
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}
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static int __init create_bulk_endpoints(struct acc_dev *dev,
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struct usb_endpoint_descriptor *in_desc,
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struct usb_endpoint_descriptor *out_desc)
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{
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struct usb_composite_dev *cdev = dev->cdev;
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struct usb_request *req;
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struct usb_ep *ep;
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int i;
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DBG(cdev, "create_bulk_endpoints dev: %p\n", dev);
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ep = usb_ep_autoconfig(cdev->gadget, in_desc);
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if (!ep) {
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DBG(cdev, "usb_ep_autoconfig for ep_in failed\n");
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return -ENODEV;
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}
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DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name);
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ep->driver_data = dev; /* claim the endpoint */
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dev->ep_in = ep;
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ep = usb_ep_autoconfig(cdev->gadget, out_desc);
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if (!ep) {
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DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
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return -ENODEV;
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}
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DBG(cdev, "usb_ep_autoconfig for ep_out got %s\n", ep->name);
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ep->driver_data = dev; /* claim the endpoint */
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dev->ep_out = ep;
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ep = usb_ep_autoconfig(cdev->gadget, out_desc);
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if (!ep) {
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DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
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return -ENODEV;
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}
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DBG(cdev, "usb_ep_autoconfig for ep_out got %s\n", ep->name);
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|
ep->driver_data = dev; /* claim the endpoint */
|
|
|
|
|
dev->ep_out = ep;
|
|
|
|
|
|
|
|
|
|
/* now allocate requests for our endpoints */
|
|
|
|
|
for (i = 0; i < TX_REQ_MAX; i++) {
|
|
|
|
|
req = acc_request_new(dev->ep_in, BULK_BUFFER_SIZE);
|
|
|
|
|
if (!req)
|
|
|
|
|
goto fail;
|
|
|
|
|
req->complete = acc_complete_in;
|
|
|
|
|
req_put(dev, &dev->tx_idle, req);
|
|
|
|
|
}
|
|
|
|
|
for (i = 0; i < RX_REQ_MAX; i++) {
|
|
|
|
|
req = acc_request_new(dev->ep_out, BULK_BUFFER_SIZE);
|
|
|
|
|
if (!req)
|
|
|
|
|
goto fail;
|
|
|
|
|
req->complete = acc_complete_out;
|
|
|
|
|
dev->rx_req[i] = req;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
fail:
|
|
|
|
|
printk(KERN_ERR "acc_bind() could not allocate requests\n");
|
|
|
|
|
while ((req = req_get(dev, &dev->tx_idle)))
|
|
|
|
|
acc_request_free(req, dev->ep_in);
|
|
|
|
|
for (i = 0; i < RX_REQ_MAX; i++)
|
|
|
|
|
acc_request_free(dev->rx_req[i], dev->ep_out);
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static ssize_t acc_read(struct file *fp, char __user *buf,
|
|
|
|
|
size_t count, loff_t *pos)
|
|
|
|
|
{
|
|
|
|
|
struct acc_dev *dev = fp->private_data;
|
|
|
|
|
struct usb_composite_dev *cdev = dev->cdev;
|
|
|
|
|
struct usb_request *req;
|
|
|
|
|
int r = count, xfer;
|
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
|
|
DBG(cdev, "acc_read(%d)\n", count);
|
|
|
|
|
|
|
|
|
|
if (dev->disconnected)
|
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
|
|
if (count > BULK_BUFFER_SIZE)
|
|
|
|
|
count = BULK_BUFFER_SIZE;
|
|
|
|
|
|
|
|
|
|
/* we will block until we're online */
|
|
|
|
|
DBG(cdev, "acc_read: waiting for online\n");
|
|
|
|
|
ret = wait_event_interruptible(dev->read_wq, dev->online);
|
|
|
|
|
if (ret < 0) {
|
|
|
|
|
r = ret;
|
|
|
|
|
goto done;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
requeue_req:
|
|
|
|
|
/* queue a request */
|
|
|
|
|
req = dev->rx_req[0];
|
|
|
|
|
req->length = count;
|
|
|
|
|
dev->rx_done = 0;
|
|
|
|
|
ret = usb_ep_queue(dev->ep_out, req, GFP_KERNEL);
|
|
|
|
|
if (ret < 0) {
|
|
|
|
|
r = -EIO;
|
|
|
|
|
goto done;
|
|
|
|
|
} else {
|
|
|
|
|
DBG(cdev, "rx %p queue\n", req);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* wait for a request to complete */
|
|
|
|
|
ret = wait_event_interruptible(dev->read_wq, dev->rx_done);
|
|
|
|
|
if (ret < 0) {
|
|
|
|
|
r = ret;
|
|
|
|
|
usb_ep_dequeue(dev->ep_out, req);
|
|
|
|
|
goto done;
|
|
|
|
|
}
|
|
|
|
|
if (dev->online) {
|
|
|
|
|
/* If we got a 0-len packet, throw it back and try again. */
|
|
|
|
|
if (req->actual == 0)
|
|
|
|
|
goto requeue_req;
|
|
|
|
|
|
|
|
|
|
DBG(cdev, "rx %p %d\n", req, req->actual);
|
|
|
|
|
xfer = (req->actual < count) ? req->actual : count;
|
|
|
|
|
r = xfer;
|
|
|
|
|
if (copy_to_user(buf, req->buf, xfer))
|
|
|
|
|
r = -EFAULT;
|
|
|
|
|
} else
|
|
|
|
|
r = -EIO;
|
|
|
|
|
|
|
|
|
|
done:
|
|
|
|
|
DBG(cdev, "acc_read returning %d\n", r);
|
|
|
|
|
return r;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static ssize_t acc_write(struct file *fp, const char __user *buf,
|
|
|
|
|
size_t count, loff_t *pos)
|
|
|
|
|
{
|
|
|
|
|
struct acc_dev *dev = fp->private_data;
|
|
|
|
|
struct usb_composite_dev *cdev = dev->cdev;
|
|
|
|
|
struct usb_request *req = 0;
|
|
|
|
|
int r = count, xfer;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
DBG(cdev, "acc_write(%d)\n", count);
|
|
|
|
|
|
|
|
|
|
if (!dev->online || dev->disconnected)
|
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
|
|
while (count > 0) {
|
|
|
|
|
if (!dev->online) {
|
|
|
|
|
DBG(cdev, "acc_write dev->error\n");
|
|
|
|
|
r = -EIO;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* get an idle tx request to use */
|
|
|
|
|
req = 0;
|
|
|
|
|
ret = wait_event_interruptible(dev->write_wq,
|
|
|
|
|
((req = req_get(dev, &dev->tx_idle)) || !dev->online));
|
|
|
|
|
if (!req) {
|
|
|
|
|
r = ret;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (count > BULK_BUFFER_SIZE)
|
|
|
|
|
xfer = BULK_BUFFER_SIZE;
|
|
|
|
|
else
|
|
|
|
|
xfer = count;
|
|
|
|
|
if (copy_from_user(req->buf, buf, xfer)) {
|
|
|
|
|
r = -EFAULT;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
req->length = xfer;
|
|
|
|
|
ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL);
|
|
|
|
|
if (ret < 0) {
|
|
|
|
|
DBG(cdev, "acc_write: xfer error %d\n", ret);
|
|
|
|
|
r = -EIO;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
buf += xfer;
|
|
|
|
|
count -= xfer;
|
|
|
|
|
|
|
|
|
|
/* zero this so we don't try to free it on error exit */
|
|
|
|
|
req = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (req)
|
|
|
|
|
req_put(dev, &dev->tx_idle, req);
|
|
|
|
|
|
|
|
|
|
DBG(cdev, "acc_write returning %d\n", r);
|
|
|
|
|
return r;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static long acc_ioctl(struct file *fp, unsigned code, unsigned long value)
|
|
|
|
|
{
|
|
|
|
|
struct acc_dev *dev = fp->private_data;
|
|
|
|
|
char *src = NULL;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
if (dev->function.disabled)
|
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
|
|
switch (code) {
|
|
|
|
|
case ACCESSORY_GET_STRING_MANUFACTURER:
|
|
|
|
|
src = dev->manufacturer;
|
|
|
|
|
break;
|
|
|
|
|
case ACCESSORY_GET_STRING_MODEL:
|
|
|
|
|
src = dev->model;
|
|
|
|
|
break;
|
|
|
|
|
case ACCESSORY_GET_STRING_DESCRIPTION:
|
|
|
|
|
src = dev->description;
|
|
|
|
|
break;
|
|
|
|
|
case ACCESSORY_GET_STRING_VERSION:
|
|
|
|
|
src = dev->version;
|
|
|
|
|
break;
|
|
|
|
|
case ACCESSORY_GET_STRING_URI:
|
|
|
|
|
src = dev->uri;
|
|
|
|
|
break;
|
|
|
|
|
case ACCESSORY_GET_STRING_SERIAL:
|
|
|
|
|
src = dev->serial;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
if (!src)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
|
|
ret = strlen(src) + 1;
|
|
|
|
|
if (copy_to_user((void __user *)value, src, ret))
|
|
|
|
|
ret = -EFAULT;
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int acc_open(struct inode *ip, struct file *fp)
|
|
|
|
|
{
|
|
|
|
|
printk(KERN_INFO "acc_open\n");
|
|
|
|
|
if (atomic_xchg(&_acc_dev->open_excl, 1))
|
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
|
|
_acc_dev->disconnected = 0;
|
|
|
|
|
fp->private_data = _acc_dev;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int acc_release(struct inode *ip, struct file *fp)
|
|
|
|
|
{
|
|
|
|
|
printk(KERN_INFO "acc_release\n");
|
|
|
|
|
|
|
|
|
|
WARN_ON(!atomic_xchg(&_acc_dev->open_excl, 0));
|
|
|
|
|
_acc_dev->disconnected = 0;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* file operations for /dev/acc_usb */
|
|
|
|
|
static const struct file_operations acc_fops = {
|
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
|
.read = acc_read,
|
|
|
|
|
.write = acc_write,
|
|
|
|
|
.unlocked_ioctl = acc_ioctl,
|
|
|
|
|
.open = acc_open,
|
|
|
|
|
.release = acc_release,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static struct miscdevice acc_device = {
|
|
|
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
|
|
|
.name = "usb_accessory",
|
|
|
|
|
.fops = &acc_fops,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
acc_function_bind(struct usb_configuration *c, struct usb_function *f)
|
|
|
|
|
{
|
|
|
|
|
struct usb_composite_dev *cdev = c->cdev;
|
|
|
|
|
struct acc_dev *dev = func_to_dev(f);
|
|
|
|
|
int id;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
dev->cdev = cdev;
|
|
|
|
|
DBG(cdev, "acc_function_bind dev: %p\n", dev);
|
|
|
|
|
|
|
|
|
|
/* allocate interface ID(s) */
|
|
|
|
|
id = usb_interface_id(c, f);
|
|
|
|
|
if (id < 0)
|
|
|
|
|
return id;
|
|
|
|
|
acc_interface_desc.bInterfaceNumber = id;
|
|
|
|
|
|
|
|
|
|
/* allocate endpoints */
|
|
|
|
|
ret = create_bulk_endpoints(dev, &acc_fullspeed_in_desc,
|
|
|
|
|
&acc_fullspeed_out_desc);
|
|
|
|
|
if (ret)
|
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
|
|
/* support high speed hardware */
|
|
|
|
|
if (gadget_is_dualspeed(c->cdev->gadget)) {
|
|
|
|
|
acc_highspeed_in_desc.bEndpointAddress =
|
|
|
|
|
acc_fullspeed_in_desc.bEndpointAddress;
|
|
|
|
|
acc_highspeed_out_desc.bEndpointAddress =
|
|
|
|
|
acc_fullspeed_out_desc.bEndpointAddress;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
|
|
|
|
|
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
|
|
|
|
|
f->name, dev->ep_in->name, dev->ep_out->name);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
acc_function_unbind(struct usb_configuration *c, struct usb_function *f)
|
|
|
|
|
{
|
|
|
|
|
struct acc_dev *dev = func_to_dev(f);
|
|
|
|
|
struct usb_request *req;
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
spin_lock_irq(&dev->lock);
|
|
|
|
|
while ((req = req_get(dev, &dev->tx_idle)))
|
|
|
|
|
acc_request_free(req, dev->ep_in);
|
|
|
|
|
for (i = 0; i < RX_REQ_MAX; i++)
|
|
|
|
|
acc_request_free(dev->rx_req[i], dev->ep_out);
|
|
|
|
|
dev->online = 0;
|
|
|
|
|
spin_unlock_irq(&dev->lock);
|
|
|
|
|
|
|
|
|
|
misc_deregister(&acc_device);
|
|
|
|
|
kfree(_acc_dev);
|
|
|
|
|
_acc_dev = NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void acc_work(struct work_struct *data)
|
|
|
|
|
{
|
|
|
|
|
struct delayed_work *delayed = to_delayed_work(data);
|
|
|
|
|
struct acc_dev *dev =
|
|
|
|
|
container_of(delayed, struct acc_dev, work);
|
|
|
|
|
android_enable_function(&dev->function, 1);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int acc_function_setup(struct usb_function *f,
|
|
|
|
|
const struct usb_ctrlrequest *ctrl)
|
|
|
|
|
{
|
|
|
|
|
struct acc_dev *dev = func_to_dev(f);
|
|
|
|
|
struct usb_composite_dev *cdev = dev->cdev;
|
|
|
|
|
int value = -EOPNOTSUPP;
|
|
|
|
|
u8 b_requestType = ctrl->bRequestType;
|
|
|
|
|
u8 b_request = ctrl->bRequest;
|
|
|
|
|
u16 w_index = le16_to_cpu(ctrl->wIndex);
|
|
|
|
|
u16 w_value = le16_to_cpu(ctrl->wValue);
|
|
|
|
|
u16 w_length = le16_to_cpu(ctrl->wLength);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
printk(KERN_INFO "acc_function_setup "
|
|
|
|
|
"%02x.%02x v%04x i%04x l%u\n",
|
|
|
|
|
b_requestType, b_request,
|
|
|
|
|
w_value, w_index, w_length);
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
if (dev->function.disabled) {
|
|
|
|
|
if (b_requestType == (USB_DIR_OUT | USB_TYPE_VENDOR)) {
|
|
|
|
|
if (b_request == ACCESSORY_START) {
|
|
|
|
|
schedule_delayed_work(
|
|
|
|
|
&dev->work, msecs_to_jiffies(10));
|
|
|
|
|
value = 0;
|
|
|
|
|
} else if (b_request == ACCESSORY_SEND_STRING) {
|
|
|
|
|
dev->string_index = w_index;
|
|
|
|
|
cdev->gadget->ep0->driver_data = dev;
|
|
|
|
|
cdev->req->complete = acc_complete_set_string;
|
|
|
|
|
value = w_length;
|
|
|
|
|
}
|
|
|
|
|
} else if (b_requestType == (USB_DIR_IN | USB_TYPE_VENDOR)) {
|
|
|
|
|
if (b_request == ACCESSORY_GET_PROTOCOL) {
|
|
|
|
|
*((u16 *)cdev->req->buf) = PROTOCOL_VERSION;
|
|
|
|
|
value = sizeof(u16);
|
|
|
|
|
|
|
|
|
|
/* clear any strings left over from a previous session */
|
|
|
|
|
memset(dev->manufacturer, 0, sizeof(dev->manufacturer));
|
|
|
|
|
memset(dev->model, 0, sizeof(dev->model));
|
|
|
|
|
memset(dev->description, 0, sizeof(dev->description));
|
|
|
|
|
memset(dev->version, 0, sizeof(dev->version));
|
|
|
|
|
memset(dev->uri, 0, sizeof(dev->uri));
|
|
|
|
|
memset(dev->serial, 0, sizeof(dev->serial));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (value >= 0) {
|
|
|
|
|
cdev->req->zero = 0;
|
|
|
|
|
cdev->req->length = value;
|
|
|
|
|
value = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
|
|
|
|
|
if (value < 0)
|
|
|
|
|
ERROR(cdev, "%s setup response queue error\n",
|
|
|
|
|
__func__);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (value == -EOPNOTSUPP)
|
|
|
|
|
VDBG(cdev,
|
|
|
|
|
"unknown class-specific control req "
|
|
|
|
|
"%02x.%02x v%04x i%04x l%u\n",
|
|
|
|
|
ctrl->bRequestType, ctrl->bRequest,
|
|
|
|
|
w_value, w_index, w_length);
|
|
|
|
|
return value;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int acc_function_set_alt(struct usb_function *f,
|
|
|
|
|
unsigned intf, unsigned alt)
|
|
|
|
|
{
|
|
|
|
|
struct acc_dev *dev = func_to_dev(f);
|
|
|
|
|
struct usb_composite_dev *cdev = f->config->cdev;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
DBG(cdev, "acc_function_set_alt intf: %d alt: %d\n", intf, alt);
|
|
|
|
|
ret = usb_ep_enable(dev->ep_in,
|
|
|
|
|
ep_choose(cdev->gadget,
|
|
|
|
|
&acc_highspeed_in_desc,
|
|
|
|
|
&acc_fullspeed_in_desc));
|
|
|
|
|
if (ret)
|
|
|
|
|
return ret;
|
|
|
|
|
ret = usb_ep_enable(dev->ep_out,
|
|
|
|
|
ep_choose(cdev->gadget,
|
|
|
|
|
&acc_highspeed_out_desc,
|
|
|
|
|
&acc_fullspeed_out_desc));
|
|
|
|
|
if (ret) {
|
|
|
|
|
usb_ep_disable(dev->ep_in);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
if (!dev->function.disabled)
|
|
|
|
|
dev->online = 1;
|
|
|
|
|
|
|
|
|
|
/* readers may be blocked waiting for us to go online */
|
|
|
|
|
wake_up(&dev->read_wq);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void acc_function_disable(struct usb_function *f)
|
|
|
|
|
{
|
|
|
|
|
struct acc_dev *dev = func_to_dev(f);
|
|
|
|
|
struct usb_composite_dev *cdev = dev->cdev;
|
|
|
|
|
|
|
|
|
|
DBG(cdev, "acc_function_disable\n");
|
|
|
|
|
acc_set_disconnected(dev);
|
|
|
|
|
usb_ep_disable(dev->ep_in);
|
|
|
|
|
usb_ep_disable(dev->ep_out);
|
|
|
|
|
|
|
|
|
|
/* readers may be blocked waiting for us to go online */
|
|
|
|
|
wake_up(&dev->read_wq);
|
|
|
|
|
|
|
|
|
|
VDBG(cdev, "%s disabled\n", dev->function.name);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int acc_bind_config(struct usb_configuration *c)
|
|
|
|
|
{
|
|
|
|
|
struct acc_dev *dev;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
printk(KERN_INFO "acc_bind_config\n");
|
|
|
|
|
|
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
|
|
|
if (!dev)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
|
|
/* allocate a string ID for our interface */
|
|
|
|
|
if (acc_string_defs[INTERFACE_STRING_INDEX].id == 0) {
|
|
|
|
|
ret = usb_string_id(c->cdev);
|
|
|
|
|
if (ret < 0)
|
|
|
|
|
return ret;
|
|
|
|
|
acc_string_defs[INTERFACE_STRING_INDEX].id = ret;
|
|
|
|
|
acc_interface_desc.iInterface = ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
spin_lock_init(&dev->lock);
|
|
|
|
|
init_waitqueue_head(&dev->read_wq);
|
|
|
|
|
init_waitqueue_head(&dev->write_wq);
|
|
|
|
|
atomic_set(&dev->open_excl, 0);
|
|
|
|
|
INIT_LIST_HEAD(&dev->tx_idle);
|
|
|
|
|
INIT_DELAYED_WORK(&dev->work, acc_work);
|
|
|
|
|
|
|
|
|
|
dev->cdev = c->cdev;
|
|
|
|
|
dev->function.name = "accessory";
|
|
|
|
|
dev->function.strings = acc_strings,
|
|
|
|
|
dev->function.descriptors = fs_acc_descs;
|
|
|
|
|
dev->function.hs_descriptors = hs_acc_descs;
|
|
|
|
|
dev->function.bind = acc_function_bind;
|
|
|
|
|
dev->function.unbind = acc_function_unbind;
|
|
|
|
|
dev->function.setup = acc_function_setup;
|
|
|
|
|
dev->function.set_alt = acc_function_set_alt;
|
|
|
|
|
dev->function.disable = acc_function_disable;
|
|
|
|
|
dev->function.disabled = 1;
|
|
|
|
|
|
|
|
|
|
/* _acc_dev must be set before calling usb_gadget_register_driver */
|
|
|
|
|
_acc_dev = dev;
|
|
|
|
|
|
|
|
|
|
ret = misc_register(&acc_device);
|
|
|
|
|
if (ret)
|
|
|
|
|
goto err1;
|
|
|
|
|
|
|
|
|
|
ret = usb_add_function(c, &dev->function);
|
|
|
|
|
if (ret)
|
|
|
|
|
goto err2;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
err2:
|
|
|
|
|
misc_deregister(&acc_device);
|
|
|
|
|
err1:
|
|
|
|
|
kfree(dev);
|
|
|
|
|
printk(KERN_ERR "USB accessory gadget driver failed to initialize\n");
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static struct android_usb_function acc_function = {
|
|
|
|
|
.name = "accessory",
|
|
|
|
|
.bind_config = acc_bind_config,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static int __init init(void)
|
|
|
|
|
{
|
|
|
|
|
printk(KERN_INFO "f_accessory init\n");
|
|
|
|
|
android_register_function(&acc_function);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
module_init(init);
|
tytung