3022 строки
66 KiB
C
3022 строки
66 KiB
C
/*
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* f_fs.c -- user mode file system API for USB composite function controllers
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*
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* Copyright (C) 2010 Samsung Electronics
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* Author: Michal Nazarewicz <mina86@mina86.com>
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*
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* Based on inode.c (GadgetFS) which was:
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* Copyright (C) 2003-2004 David Brownell
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* Copyright (C) 2003 Agilent Technologies
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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/* #define DEBUG */
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/* #define VERBOSE_DEBUG */
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#include <linux/blkdev.h>
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#include <linux/pagemap.h>
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#include <linux/export.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include <asm/unaligned.h>
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#include <linux/usb/composite.h>
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#include <linux/usb/functionfs.h>
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#include <linux/aio.h>
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#include <linux/mmu_context.h>
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#include <linux/poll.h>
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#include "u_fs.h"
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#include "u_f.h"
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#include "configfs.h"
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#define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */
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/* Reference counter handling */
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static void ffs_data_get(struct ffs_data *ffs);
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static void ffs_data_put(struct ffs_data *ffs);
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/* Creates new ffs_data object. */
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static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc));
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/* Opened counter handling. */
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static void ffs_data_opened(struct ffs_data *ffs);
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static void ffs_data_closed(struct ffs_data *ffs);
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/* Called with ffs->mutex held; take over ownership of data. */
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static int __must_check
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__ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len);
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static int __must_check
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__ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len);
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/* The function structure ***************************************************/
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struct ffs_ep;
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struct ffs_function {
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struct usb_configuration *conf;
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struct usb_gadget *gadget;
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struct ffs_data *ffs;
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struct ffs_ep *eps;
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u8 eps_revmap[16];
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short *interfaces_nums;
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struct usb_function function;
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};
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static struct ffs_function *ffs_func_from_usb(struct usb_function *f)
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{
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return container_of(f, struct ffs_function, function);
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}
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static inline enum ffs_setup_state
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ffs_setup_state_clear_cancelled(struct ffs_data *ffs)
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{
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return (enum ffs_setup_state)
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cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP);
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}
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static void ffs_func_eps_disable(struct ffs_function *func);
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static int __must_check ffs_func_eps_enable(struct ffs_function *func);
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static int ffs_func_bind(struct usb_configuration *,
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struct usb_function *);
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static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned);
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static void ffs_func_disable(struct usb_function *);
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static int ffs_func_setup(struct usb_function *,
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const struct usb_ctrlrequest *);
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static void ffs_func_suspend(struct usb_function *);
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static void ffs_func_resume(struct usb_function *);
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static int ffs_func_revmap_ep(struct ffs_function *func, u8 num);
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static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf);
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/* The endpoints structures *************************************************/
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struct ffs_ep {
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struct usb_ep *ep; /* P: ffs->eps_lock */
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struct usb_request *req; /* P: epfile->mutex */
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/* [0]: full speed, [1]: high speed, [2]: super speed */
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struct usb_endpoint_descriptor *descs[3];
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u8 num;
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int status; /* P: epfile->mutex */
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};
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struct ffs_epfile {
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/* Protects ep->ep and ep->req. */
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struct mutex mutex;
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wait_queue_head_t wait;
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struct ffs_data *ffs;
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struct ffs_ep *ep; /* P: ffs->eps_lock */
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struct dentry *dentry;
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char name[5];
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unsigned char in; /* P: ffs->eps_lock */
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unsigned char isoc; /* P: ffs->eps_lock */
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unsigned char _pad;
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};
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/* ffs_io_data structure ***************************************************/
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struct ffs_io_data {
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bool aio;
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bool read;
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struct kiocb *kiocb;
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const struct iovec *iovec;
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unsigned long nr_segs;
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char __user *buf;
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size_t len;
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struct mm_struct *mm;
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struct work_struct work;
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struct usb_ep *ep;
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struct usb_request *req;
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};
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static int __must_check ffs_epfiles_create(struct ffs_data *ffs);
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static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count);
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static struct inode *__must_check
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ffs_sb_create_file(struct super_block *sb, const char *name, void *data,
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const struct file_operations *fops,
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struct dentry **dentry_p);
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/* Devices management *******************************************************/
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DEFINE_MUTEX(ffs_lock);
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EXPORT_SYMBOL_GPL(ffs_lock);
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static struct ffs_dev *_ffs_find_dev(const char *name);
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static struct ffs_dev *_ffs_alloc_dev(void);
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static int _ffs_name_dev(struct ffs_dev *dev, const char *name);
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static void _ffs_free_dev(struct ffs_dev *dev);
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static void *ffs_acquire_dev(const char *dev_name);
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static void ffs_release_dev(struct ffs_data *ffs_data);
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static int ffs_ready(struct ffs_data *ffs);
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static void ffs_closed(struct ffs_data *ffs);
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/* Misc helper functions ****************************************************/
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static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock)
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__attribute__((warn_unused_result, nonnull));
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static char *ffs_prepare_buffer(const char __user *buf, size_t len)
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__attribute__((warn_unused_result, nonnull));
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/* Control file aka ep0 *****************************************************/
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static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct ffs_data *ffs = req->context;
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complete_all(&ffs->ep0req_completion);
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}
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static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len)
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{
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struct usb_request *req = ffs->ep0req;
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int ret;
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req->zero = len < le16_to_cpu(ffs->ev.setup.wLength);
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spin_unlock_irq(&ffs->ev.waitq.lock);
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req->buf = data;
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req->length = len;
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/*
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* UDC layer requires to provide a buffer even for ZLP, but should
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* not use it at all. Let's provide some poisoned pointer to catch
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* possible bug in the driver.
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*/
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if (req->buf == NULL)
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req->buf = (void *)0xDEADBABE;
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reinit_completion(&ffs->ep0req_completion);
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ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC);
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if (unlikely(ret < 0))
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return ret;
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ret = wait_for_completion_interruptible(&ffs->ep0req_completion);
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if (unlikely(ret)) {
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usb_ep_dequeue(ffs->gadget->ep0, req);
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return -EINTR;
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}
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ffs->setup_state = FFS_NO_SETUP;
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return req->status ? req->status : req->actual;
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}
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static int __ffs_ep0_stall(struct ffs_data *ffs)
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{
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if (ffs->ev.can_stall) {
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pr_vdebug("ep0 stall\n");
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usb_ep_set_halt(ffs->gadget->ep0);
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ffs->setup_state = FFS_NO_SETUP;
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return -EL2HLT;
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} else {
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pr_debug("bogus ep0 stall!\n");
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return -ESRCH;
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}
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}
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static ssize_t ffs_ep0_write(struct file *file, const char __user *buf,
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size_t len, loff_t *ptr)
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{
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struct ffs_data *ffs = file->private_data;
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ssize_t ret;
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char *data;
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ENTER();
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/* Fast check if setup was canceled */
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if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED)
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return -EIDRM;
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/* Acquire mutex */
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ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);
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if (unlikely(ret < 0))
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return ret;
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/* Check state */
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switch (ffs->state) {
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case FFS_READ_DESCRIPTORS:
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case FFS_READ_STRINGS:
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/* Copy data */
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if (unlikely(len < 16)) {
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ret = -EINVAL;
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break;
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}
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data = ffs_prepare_buffer(buf, len);
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if (IS_ERR(data)) {
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ret = PTR_ERR(data);
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break;
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}
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/* Handle data */
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if (ffs->state == FFS_READ_DESCRIPTORS) {
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pr_info("read descriptors\n");
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ret = __ffs_data_got_descs(ffs, data, len);
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if (unlikely(ret < 0))
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break;
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ffs->state = FFS_READ_STRINGS;
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ret = len;
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} else {
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pr_info("read strings\n");
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ret = __ffs_data_got_strings(ffs, data, len);
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if (unlikely(ret < 0))
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break;
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ret = ffs_epfiles_create(ffs);
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if (unlikely(ret)) {
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ffs->state = FFS_CLOSING;
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break;
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}
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ffs->state = FFS_ACTIVE;
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mutex_unlock(&ffs->mutex);
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ret = ffs_ready(ffs);
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if (unlikely(ret < 0)) {
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ffs->state = FFS_CLOSING;
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return ret;
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}
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set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags);
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return len;
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}
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break;
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case FFS_ACTIVE:
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data = NULL;
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/*
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* We're called from user space, we can use _irq
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* rather then _irqsave
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*/
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spin_lock_irq(&ffs->ev.waitq.lock);
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switch (ffs_setup_state_clear_cancelled(ffs)) {
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case FFS_SETUP_CANCELLED:
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ret = -EIDRM;
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goto done_spin;
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case FFS_NO_SETUP:
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ret = -ESRCH;
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goto done_spin;
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case FFS_SETUP_PENDING:
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break;
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}
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/* FFS_SETUP_PENDING */
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if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) {
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spin_unlock_irq(&ffs->ev.waitq.lock);
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ret = __ffs_ep0_stall(ffs);
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break;
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}
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/* FFS_SETUP_PENDING and not stall */
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len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength));
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spin_unlock_irq(&ffs->ev.waitq.lock);
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data = ffs_prepare_buffer(buf, len);
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if (IS_ERR(data)) {
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ret = PTR_ERR(data);
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break;
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}
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spin_lock_irq(&ffs->ev.waitq.lock);
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/*
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* We are guaranteed to be still in FFS_ACTIVE state
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* but the state of setup could have changed from
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* FFS_SETUP_PENDING to FFS_SETUP_CANCELLED so we need
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* to check for that. If that happened we copied data
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* from user space in vain but it's unlikely.
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*
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* For sure we are not in FFS_NO_SETUP since this is
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* the only place FFS_SETUP_PENDING -> FFS_NO_SETUP
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* transition can be performed and it's protected by
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* mutex.
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*/
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if (ffs_setup_state_clear_cancelled(ffs) ==
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FFS_SETUP_CANCELLED) {
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ret = -EIDRM;
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done_spin:
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spin_unlock_irq(&ffs->ev.waitq.lock);
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} else {
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/* unlocks spinlock */
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ret = __ffs_ep0_queue_wait(ffs, data, len);
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}
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kfree(data);
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break;
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default:
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ret = -EBADFD;
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break;
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}
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mutex_unlock(&ffs->mutex);
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return ret;
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}
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static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf,
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size_t n)
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{
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/*
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* We are holding ffs->ev.waitq.lock and ffs->mutex and we need
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* to release them.
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*/
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struct usb_functionfs_event events[n];
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unsigned i = 0;
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memset(events, 0, sizeof events);
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do {
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events[i].type = ffs->ev.types[i];
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if (events[i].type == FUNCTIONFS_SETUP) {
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events[i].u.setup = ffs->ev.setup;
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ffs->setup_state = FFS_SETUP_PENDING;
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}
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} while (++i < n);
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if (n < ffs->ev.count) {
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ffs->ev.count -= n;
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memmove(ffs->ev.types, ffs->ev.types + n,
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ffs->ev.count * sizeof *ffs->ev.types);
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} else {
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ffs->ev.count = 0;
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}
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spin_unlock_irq(&ffs->ev.waitq.lock);
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mutex_unlock(&ffs->mutex);
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return unlikely(__copy_to_user(buf, events, sizeof events))
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? -EFAULT : sizeof events;
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}
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static ssize_t ffs_ep0_read(struct file *file, char __user *buf,
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size_t len, loff_t *ptr)
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{
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struct ffs_data *ffs = file->private_data;
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char *data = NULL;
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size_t n;
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int ret;
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ENTER();
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/* Fast check if setup was canceled */
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if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED)
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return -EIDRM;
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/* Acquire mutex */
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ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);
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if (unlikely(ret < 0))
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return ret;
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/* Check state */
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if (ffs->state != FFS_ACTIVE) {
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ret = -EBADFD;
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goto done_mutex;
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}
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/*
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* We're called from user space, we can use _irq rather then
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* _irqsave
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*/
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spin_lock_irq(&ffs->ev.waitq.lock);
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switch (ffs_setup_state_clear_cancelled(ffs)) {
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case FFS_SETUP_CANCELLED:
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ret = -EIDRM;
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break;
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case FFS_NO_SETUP:
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n = len / sizeof(struct usb_functionfs_event);
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if (unlikely(!n)) {
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ret = -EINVAL;
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break;
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}
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if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) {
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ret = -EAGAIN;
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break;
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}
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if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq,
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ffs->ev.count)) {
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ret = -EINTR;
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break;
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}
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return __ffs_ep0_read_events(ffs, buf,
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min(n, (size_t)ffs->ev.count));
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case FFS_SETUP_PENDING:
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if (ffs->ev.setup.bRequestType & USB_DIR_IN) {
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spin_unlock_irq(&ffs->ev.waitq.lock);
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ret = __ffs_ep0_stall(ffs);
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goto done_mutex;
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}
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len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength));
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spin_unlock_irq(&ffs->ev.waitq.lock);
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if (likely(len)) {
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data = kmalloc(len, GFP_KERNEL);
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if (unlikely(!data)) {
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ret = -ENOMEM;
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goto done_mutex;
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}
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}
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spin_lock_irq(&ffs->ev.waitq.lock);
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/* See ffs_ep0_write() */
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if (ffs_setup_state_clear_cancelled(ffs) ==
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FFS_SETUP_CANCELLED) {
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ret = -EIDRM;
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break;
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}
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/* unlocks spinlock */
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ret = __ffs_ep0_queue_wait(ffs, data, len);
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if (likely(ret > 0) && unlikely(__copy_to_user(buf, data, len)))
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ret = -EFAULT;
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goto done_mutex;
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default:
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ret = -EBADFD;
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break;
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}
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spin_unlock_irq(&ffs->ev.waitq.lock);
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done_mutex:
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mutex_unlock(&ffs->mutex);
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kfree(data);
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return ret;
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}
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static int ffs_ep0_open(struct inode *inode, struct file *file)
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{
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struct ffs_data *ffs = inode->i_private;
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ENTER();
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if (unlikely(ffs->state == FFS_CLOSING))
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return -EBUSY;
|
|
|
|
file->private_data = ffs;
|
|
ffs_data_opened(ffs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ffs_ep0_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct ffs_data *ffs = file->private_data;
|
|
|
|
ENTER();
|
|
|
|
ffs_data_closed(ffs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value)
|
|
{
|
|
struct ffs_data *ffs = file->private_data;
|
|
struct usb_gadget *gadget = ffs->gadget;
|
|
long ret;
|
|
|
|
ENTER();
|
|
|
|
if (code == FUNCTIONFS_INTERFACE_REVMAP) {
|
|
struct ffs_function *func = ffs->func;
|
|
ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV;
|
|
} else if (gadget && gadget->ops->ioctl) {
|
|
ret = gadget->ops->ioctl(gadget, code, value);
|
|
} else {
|
|
ret = -ENOTTY;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static unsigned int ffs_ep0_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct ffs_data *ffs = file->private_data;
|
|
unsigned int mask = POLLWRNORM;
|
|
int ret;
|
|
|
|
poll_wait(file, &ffs->ev.waitq, wait);
|
|
|
|
ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);
|
|
if (unlikely(ret < 0))
|
|
return mask;
|
|
|
|
switch (ffs->state) {
|
|
case FFS_READ_DESCRIPTORS:
|
|
case FFS_READ_STRINGS:
|
|
mask |= POLLOUT;
|
|
break;
|
|
|
|
case FFS_ACTIVE:
|
|
switch (ffs->setup_state) {
|
|
case FFS_NO_SETUP:
|
|
if (ffs->ev.count)
|
|
mask |= POLLIN;
|
|
break;
|
|
|
|
case FFS_SETUP_PENDING:
|
|
case FFS_SETUP_CANCELLED:
|
|
mask |= (POLLIN | POLLOUT);
|
|
break;
|
|
}
|
|
case FFS_CLOSING:
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&ffs->mutex);
|
|
|
|
return mask;
|
|
}
|
|
|
|
static const struct file_operations ffs_ep0_operations = {
|
|
.llseek = no_llseek,
|
|
|
|
.open = ffs_ep0_open,
|
|
.write = ffs_ep0_write,
|
|
.read = ffs_ep0_read,
|
|
.release = ffs_ep0_release,
|
|
.unlocked_ioctl = ffs_ep0_ioctl,
|
|
.poll = ffs_ep0_poll,
|
|
};
|
|
|
|
|
|
/* "Normal" endpoints operations ********************************************/
|
|
|
|
static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req)
|
|
{
|
|
ENTER();
|
|
if (likely(req->context)) {
|
|
struct ffs_ep *ep = _ep->driver_data;
|
|
ep->status = req->status ? req->status : req->actual;
|
|
complete(req->context);
|
|
}
|
|
}
|
|
|
|
static void ffs_user_copy_worker(struct work_struct *work)
|
|
{
|
|
struct ffs_io_data *io_data = container_of(work, struct ffs_io_data,
|
|
work);
|
|
int ret = io_data->req->status ? io_data->req->status :
|
|
io_data->req->actual;
|
|
|
|
if (io_data->read && ret > 0) {
|
|
int i;
|
|
size_t pos = 0;
|
|
use_mm(io_data->mm);
|
|
for (i = 0; i < io_data->nr_segs; i++) {
|
|
if (unlikely(copy_to_user(io_data->iovec[i].iov_base,
|
|
&io_data->buf[pos],
|
|
io_data->iovec[i].iov_len))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
pos += io_data->iovec[i].iov_len;
|
|
}
|
|
unuse_mm(io_data->mm);
|
|
}
|
|
|
|
aio_complete(io_data->kiocb, ret, ret);
|
|
|
|
usb_ep_free_request(io_data->ep, io_data->req);
|
|
|
|
io_data->kiocb->private = NULL;
|
|
if (io_data->read)
|
|
kfree(io_data->iovec);
|
|
kfree(io_data->buf);
|
|
kfree(io_data);
|
|
}
|
|
|
|
static void ffs_epfile_async_io_complete(struct usb_ep *_ep,
|
|
struct usb_request *req)
|
|
{
|
|
struct ffs_io_data *io_data = req->context;
|
|
|
|
ENTER();
|
|
|
|
INIT_WORK(&io_data->work, ffs_user_copy_worker);
|
|
schedule_work(&io_data->work);
|
|
}
|
|
|
|
static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
|
|
{
|
|
struct ffs_epfile *epfile = file->private_data;
|
|
struct ffs_ep *ep;
|
|
char *data = NULL;
|
|
ssize_t ret, data_len;
|
|
int halt;
|
|
|
|
/* Are we still active? */
|
|
if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) {
|
|
ret = -ENODEV;
|
|
goto error;
|
|
}
|
|
|
|
/* Wait for endpoint to be enabled */
|
|
ep = epfile->ep;
|
|
if (!ep) {
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
ret = -EAGAIN;
|
|
goto error;
|
|
}
|
|
|
|
ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep));
|
|
if (ret) {
|
|
ret = -EINTR;
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Do we halt? */
|
|
halt = (!io_data->read == !epfile->in);
|
|
if (halt && epfile->isoc) {
|
|
ret = -EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
/* Allocate & copy */
|
|
if (!halt) {
|
|
/*
|
|
* if we _do_ wait above, the epfile->ffs->gadget might be NULL
|
|
* before the waiting completes, so do not assign to 'gadget' earlier
|
|
*/
|
|
struct usb_gadget *gadget = epfile->ffs->gadget;
|
|
|
|
spin_lock_irq(&epfile->ffs->eps_lock);
|
|
/* In the meantime, endpoint got disabled or changed. */
|
|
if (epfile->ep != ep) {
|
|
spin_unlock_irq(&epfile->ffs->eps_lock);
|
|
return -ESHUTDOWN;
|
|
}
|
|
/*
|
|
* Controller may require buffer size to be aligned to
|
|
* maxpacketsize of an out endpoint.
|
|
*/
|
|
data_len = io_data->read ?
|
|
usb_ep_align_maybe(gadget, ep->ep, io_data->len) :
|
|
io_data->len;
|
|
spin_unlock_irq(&epfile->ffs->eps_lock);
|
|
|
|
data = kmalloc(data_len, GFP_KERNEL);
|
|
if (unlikely(!data))
|
|
return -ENOMEM;
|
|
if (io_data->aio && !io_data->read) {
|
|
int i;
|
|
size_t pos = 0;
|
|
for (i = 0; i < io_data->nr_segs; i++) {
|
|
if (unlikely(copy_from_user(&data[pos],
|
|
io_data->iovec[i].iov_base,
|
|
io_data->iovec[i].iov_len))) {
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
pos += io_data->iovec[i].iov_len;
|
|
}
|
|
} else {
|
|
if (!io_data->read &&
|
|
unlikely(__copy_from_user(data, io_data->buf,
|
|
io_data->len))) {
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* We will be using request */
|
|
ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK);
|
|
if (unlikely(ret))
|
|
goto error;
|
|
|
|
spin_lock_irq(&epfile->ffs->eps_lock);
|
|
|
|
if (epfile->ep != ep) {
|
|
/* In the meantime, endpoint got disabled or changed. */
|
|
ret = -ESHUTDOWN;
|
|
spin_unlock_irq(&epfile->ffs->eps_lock);
|
|
} else if (halt) {
|
|
/* Halt */
|
|
if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep))
|
|
usb_ep_set_halt(ep->ep);
|
|
spin_unlock_irq(&epfile->ffs->eps_lock);
|
|
ret = -EBADMSG;
|
|
} else {
|
|
/* Fire the request */
|
|
struct usb_request *req;
|
|
|
|
if (io_data->aio) {
|
|
req = usb_ep_alloc_request(ep->ep, GFP_KERNEL);
|
|
if (unlikely(!req))
|
|
goto error_lock;
|
|
|
|
req->buf = data;
|
|
req->length = io_data->len;
|
|
|
|
io_data->buf = data;
|
|
io_data->ep = ep->ep;
|
|
io_data->req = req;
|
|
|
|
req->context = io_data;
|
|
req->complete = ffs_epfile_async_io_complete;
|
|
|
|
ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC);
|
|
if (unlikely(ret)) {
|
|
usb_ep_free_request(ep->ep, req);
|
|
goto error_lock;
|
|
}
|
|
ret = -EIOCBQUEUED;
|
|
|
|
spin_unlock_irq(&epfile->ffs->eps_lock);
|
|
} else {
|
|
DECLARE_COMPLETION_ONSTACK(done);
|
|
|
|
req = ep->req;
|
|
req->buf = data;
|
|
req->length = io_data->len;
|
|
|
|
req->context = &done;
|
|
req->complete = ffs_epfile_io_complete;
|
|
|
|
ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC);
|
|
|
|
spin_unlock_irq(&epfile->ffs->eps_lock);
|
|
|
|
if (unlikely(ret < 0)) {
|
|
/* nop */
|
|
} else if (unlikely(
|
|
wait_for_completion_interruptible(&done))) {
|
|
ret = -EINTR;
|
|
usb_ep_dequeue(ep->ep, req);
|
|
} else {
|
|
/*
|
|
* XXX We may end up silently droping data
|
|
* here. Since data_len (i.e. req->length) may
|
|
* be bigger than len (after being rounded up
|
|
* to maxpacketsize), we may end up with more
|
|
* data then user space has space for.
|
|
*/
|
|
ret = ep->status;
|
|
if (io_data->read && ret > 0) {
|
|
ret = min_t(size_t, ret, io_data->len);
|
|
|
|
if (unlikely(copy_to_user(io_data->buf,
|
|
data, ret)))
|
|
ret = -EFAULT;
|
|
}
|
|
}
|
|
kfree(data);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&epfile->mutex);
|
|
return ret;
|
|
|
|
error_lock:
|
|
spin_unlock_irq(&epfile->ffs->eps_lock);
|
|
mutex_unlock(&epfile->mutex);
|
|
error:
|
|
kfree(data);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t
|
|
ffs_epfile_write(struct file *file, const char __user *buf, size_t len,
|
|
loff_t *ptr)
|
|
{
|
|
struct ffs_io_data io_data;
|
|
|
|
ENTER();
|
|
|
|
io_data.aio = false;
|
|
io_data.read = false;
|
|
io_data.buf = (char * __user)buf;
|
|
io_data.len = len;
|
|
|
|
return ffs_epfile_io(file, &io_data);
|
|
}
|
|
|
|
static ssize_t
|
|
ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr)
|
|
{
|
|
struct ffs_io_data io_data;
|
|
|
|
ENTER();
|
|
|
|
io_data.aio = false;
|
|
io_data.read = true;
|
|
io_data.buf = buf;
|
|
io_data.len = len;
|
|
|
|
return ffs_epfile_io(file, &io_data);
|
|
}
|
|
|
|
static int
|
|
ffs_epfile_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct ffs_epfile *epfile = inode->i_private;
|
|
|
|
ENTER();
|
|
|
|
if (WARN_ON(epfile->ffs->state != FFS_ACTIVE))
|
|
return -ENODEV;
|
|
|
|
file->private_data = epfile;
|
|
ffs_data_opened(epfile->ffs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ffs_aio_cancel(struct kiocb *kiocb)
|
|
{
|
|
struct ffs_io_data *io_data = kiocb->private;
|
|
struct ffs_epfile *epfile = kiocb->ki_filp->private_data;
|
|
int value;
|
|
|
|
ENTER();
|
|
|
|
spin_lock_irq(&epfile->ffs->eps_lock);
|
|
|
|
if (likely(io_data && io_data->ep && io_data->req))
|
|
value = usb_ep_dequeue(io_data->ep, io_data->req);
|
|
else
|
|
value = -EINVAL;
|
|
|
|
spin_unlock_irq(&epfile->ffs->eps_lock);
|
|
|
|
return value;
|
|
}
|
|
|
|
static ssize_t ffs_epfile_aio_write(struct kiocb *kiocb,
|
|
const struct iovec *iovec,
|
|
unsigned long nr_segs, loff_t loff)
|
|
{
|
|
struct ffs_io_data *io_data;
|
|
|
|
ENTER();
|
|
|
|
io_data = kmalloc(sizeof(*io_data), GFP_KERNEL);
|
|
if (unlikely(!io_data))
|
|
return -ENOMEM;
|
|
|
|
io_data->aio = true;
|
|
io_data->read = false;
|
|
io_data->kiocb = kiocb;
|
|
io_data->iovec = iovec;
|
|
io_data->nr_segs = nr_segs;
|
|
io_data->len = kiocb->ki_nbytes;
|
|
io_data->mm = current->mm;
|
|
|
|
kiocb->private = io_data;
|
|
|
|
kiocb_set_cancel_fn(kiocb, ffs_aio_cancel);
|
|
|
|
return ffs_epfile_io(kiocb->ki_filp, io_data);
|
|
}
|
|
|
|
static ssize_t ffs_epfile_aio_read(struct kiocb *kiocb,
|
|
const struct iovec *iovec,
|
|
unsigned long nr_segs, loff_t loff)
|
|
{
|
|
struct ffs_io_data *io_data;
|
|
struct iovec *iovec_copy;
|
|
|
|
ENTER();
|
|
|
|
iovec_copy = kmalloc_array(nr_segs, sizeof(*iovec_copy), GFP_KERNEL);
|
|
if (unlikely(!iovec_copy))
|
|
return -ENOMEM;
|
|
|
|
memcpy(iovec_copy, iovec, sizeof(struct iovec)*nr_segs);
|
|
|
|
io_data = kmalloc(sizeof(*io_data), GFP_KERNEL);
|
|
if (unlikely(!io_data)) {
|
|
kfree(iovec_copy);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
io_data->aio = true;
|
|
io_data->read = true;
|
|
io_data->kiocb = kiocb;
|
|
io_data->iovec = iovec_copy;
|
|
io_data->nr_segs = nr_segs;
|
|
io_data->len = kiocb->ki_nbytes;
|
|
io_data->mm = current->mm;
|
|
|
|
kiocb->private = io_data;
|
|
|
|
kiocb_set_cancel_fn(kiocb, ffs_aio_cancel);
|
|
|
|
return ffs_epfile_io(kiocb->ki_filp, io_data);
|
|
}
|
|
|
|
static int
|
|
ffs_epfile_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct ffs_epfile *epfile = inode->i_private;
|
|
|
|
ENTER();
|
|
|
|
ffs_data_closed(epfile->ffs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long ffs_epfile_ioctl(struct file *file, unsigned code,
|
|
unsigned long value)
|
|
{
|
|
struct ffs_epfile *epfile = file->private_data;
|
|
int ret;
|
|
|
|
ENTER();
|
|
|
|
if (WARN_ON(epfile->ffs->state != FFS_ACTIVE))
|
|
return -ENODEV;
|
|
|
|
spin_lock_irq(&epfile->ffs->eps_lock);
|
|
if (likely(epfile->ep)) {
|
|
switch (code) {
|
|
case FUNCTIONFS_FIFO_STATUS:
|
|
ret = usb_ep_fifo_status(epfile->ep->ep);
|
|
break;
|
|
case FUNCTIONFS_FIFO_FLUSH:
|
|
usb_ep_fifo_flush(epfile->ep->ep);
|
|
ret = 0;
|
|
break;
|
|
case FUNCTIONFS_CLEAR_HALT:
|
|
ret = usb_ep_clear_halt(epfile->ep->ep);
|
|
break;
|
|
case FUNCTIONFS_ENDPOINT_REVMAP:
|
|
ret = epfile->ep->num;
|
|
break;
|
|
default:
|
|
ret = -ENOTTY;
|
|
}
|
|
} else {
|
|
ret = -ENODEV;
|
|
}
|
|
spin_unlock_irq(&epfile->ffs->eps_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations ffs_epfile_operations = {
|
|
.llseek = no_llseek,
|
|
|
|
.open = ffs_epfile_open,
|
|
.write = ffs_epfile_write,
|
|
.read = ffs_epfile_read,
|
|
.aio_write = ffs_epfile_aio_write,
|
|
.aio_read = ffs_epfile_aio_read,
|
|
.release = ffs_epfile_release,
|
|
.unlocked_ioctl = ffs_epfile_ioctl,
|
|
};
|
|
|
|
|
|
/* File system and super block operations ***********************************/
|
|
|
|
/*
|
|
* Mounting the file system creates a controller file, used first for
|
|
* function configuration then later for event monitoring.
|
|
*/
|
|
|
|
static struct inode *__must_check
|
|
ffs_sb_make_inode(struct super_block *sb, void *data,
|
|
const struct file_operations *fops,
|
|
const struct inode_operations *iops,
|
|
struct ffs_file_perms *perms)
|
|
{
|
|
struct inode *inode;
|
|
|
|
ENTER();
|
|
|
|
inode = new_inode(sb);
|
|
|
|
if (likely(inode)) {
|
|
struct timespec current_time = CURRENT_TIME;
|
|
|
|
inode->i_ino = get_next_ino();
|
|
inode->i_mode = perms->mode;
|
|
inode->i_uid = perms->uid;
|
|
inode->i_gid = perms->gid;
|
|
inode->i_atime = current_time;
|
|
inode->i_mtime = current_time;
|
|
inode->i_ctime = current_time;
|
|
inode->i_private = data;
|
|
if (fops)
|
|
inode->i_fop = fops;
|
|
if (iops)
|
|
inode->i_op = iops;
|
|
}
|
|
|
|
return inode;
|
|
}
|
|
|
|
/* Create "regular" file */
|
|
static struct inode *ffs_sb_create_file(struct super_block *sb,
|
|
const char *name, void *data,
|
|
const struct file_operations *fops,
|
|
struct dentry **dentry_p)
|
|
{
|
|
struct ffs_data *ffs = sb->s_fs_info;
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
|
|
ENTER();
|
|
|
|
dentry = d_alloc_name(sb->s_root, name);
|
|
if (unlikely(!dentry))
|
|
return NULL;
|
|
|
|
inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms);
|
|
if (unlikely(!inode)) {
|
|
dput(dentry);
|
|
return NULL;
|
|
}
|
|
|
|
d_add(dentry, inode);
|
|
if (dentry_p)
|
|
*dentry_p = dentry;
|
|
|
|
return inode;
|
|
}
|
|
|
|
/* Super block */
|
|
static const struct super_operations ffs_sb_operations = {
|
|
.statfs = simple_statfs,
|
|
.drop_inode = generic_delete_inode,
|
|
};
|
|
|
|
struct ffs_sb_fill_data {
|
|
struct ffs_file_perms perms;
|
|
umode_t root_mode;
|
|
const char *dev_name;
|
|
struct ffs_data *ffs_data;
|
|
};
|
|
|
|
static int ffs_sb_fill(struct super_block *sb, void *_data, int silent)
|
|
{
|
|
struct ffs_sb_fill_data *data = _data;
|
|
struct inode *inode;
|
|
struct ffs_data *ffs = data->ffs_data;
|
|
|
|
ENTER();
|
|
|
|
ffs->sb = sb;
|
|
data->ffs_data = NULL;
|
|
sb->s_fs_info = ffs;
|
|
sb->s_blocksize = PAGE_CACHE_SIZE;
|
|
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
|
|
sb->s_magic = FUNCTIONFS_MAGIC;
|
|
sb->s_op = &ffs_sb_operations;
|
|
sb->s_time_gran = 1;
|
|
|
|
/* Root inode */
|
|
data->perms.mode = data->root_mode;
|
|
inode = ffs_sb_make_inode(sb, NULL,
|
|
&simple_dir_operations,
|
|
&simple_dir_inode_operations,
|
|
&data->perms);
|
|
sb->s_root = d_make_root(inode);
|
|
if (unlikely(!sb->s_root))
|
|
return -ENOMEM;
|
|
|
|
/* EP0 file */
|
|
if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs,
|
|
&ffs_ep0_operations, NULL)))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts)
|
|
{
|
|
ENTER();
|
|
|
|
if (!opts || !*opts)
|
|
return 0;
|
|
|
|
for (;;) {
|
|
unsigned long value;
|
|
char *eq, *comma;
|
|
|
|
/* Option limit */
|
|
comma = strchr(opts, ',');
|
|
if (comma)
|
|
*comma = 0;
|
|
|
|
/* Value limit */
|
|
eq = strchr(opts, '=');
|
|
if (unlikely(!eq)) {
|
|
pr_err("'=' missing in %s\n", opts);
|
|
return -EINVAL;
|
|
}
|
|
*eq = 0;
|
|
|
|
/* Parse value */
|
|
if (kstrtoul(eq + 1, 0, &value)) {
|
|
pr_err("%s: invalid value: %s\n", opts, eq + 1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Interpret option */
|
|
switch (eq - opts) {
|
|
case 5:
|
|
if (!memcmp(opts, "rmode", 5))
|
|
data->root_mode = (value & 0555) | S_IFDIR;
|
|
else if (!memcmp(opts, "fmode", 5))
|
|
data->perms.mode = (value & 0666) | S_IFREG;
|
|
else
|
|
goto invalid;
|
|
break;
|
|
|
|
case 4:
|
|
if (!memcmp(opts, "mode", 4)) {
|
|
data->root_mode = (value & 0555) | S_IFDIR;
|
|
data->perms.mode = (value & 0666) | S_IFREG;
|
|
} else {
|
|
goto invalid;
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
if (!memcmp(opts, "uid", 3)) {
|
|
data->perms.uid = make_kuid(current_user_ns(), value);
|
|
if (!uid_valid(data->perms.uid)) {
|
|
pr_err("%s: unmapped value: %lu\n", opts, value);
|
|
return -EINVAL;
|
|
}
|
|
} else if (!memcmp(opts, "gid", 3)) {
|
|
data->perms.gid = make_kgid(current_user_ns(), value);
|
|
if (!gid_valid(data->perms.gid)) {
|
|
pr_err("%s: unmapped value: %lu\n", opts, value);
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
goto invalid;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
invalid:
|
|
pr_err("%s: invalid option\n", opts);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Next iteration */
|
|
if (!comma)
|
|
break;
|
|
opts = comma + 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* "mount -t functionfs dev_name /dev/function" ends up here */
|
|
|
|
static struct dentry *
|
|
ffs_fs_mount(struct file_system_type *t, int flags,
|
|
const char *dev_name, void *opts)
|
|
{
|
|
struct ffs_sb_fill_data data = {
|
|
.perms = {
|
|
.mode = S_IFREG | 0600,
|
|
.uid = GLOBAL_ROOT_UID,
|
|
.gid = GLOBAL_ROOT_GID,
|
|
},
|
|
.root_mode = S_IFDIR | 0500,
|
|
};
|
|
struct dentry *rv;
|
|
int ret;
|
|
void *ffs_dev;
|
|
struct ffs_data *ffs;
|
|
|
|
ENTER();
|
|
|
|
ret = ffs_fs_parse_opts(&data, opts);
|
|
if (unlikely(ret < 0))
|
|
return ERR_PTR(ret);
|
|
|
|
ffs = ffs_data_new();
|
|
if (unlikely(!ffs))
|
|
return ERR_PTR(-ENOMEM);
|
|
ffs->file_perms = data.perms;
|
|
|
|
ffs->dev_name = kstrdup(dev_name, GFP_KERNEL);
|
|
if (unlikely(!ffs->dev_name)) {
|
|
ffs_data_put(ffs);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
ffs_dev = ffs_acquire_dev(dev_name);
|
|
if (IS_ERR(ffs_dev)) {
|
|
ffs_data_put(ffs);
|
|
return ERR_CAST(ffs_dev);
|
|
}
|
|
ffs->private_data = ffs_dev;
|
|
data.ffs_data = ffs;
|
|
|
|
rv = mount_nodev(t, flags, &data, ffs_sb_fill);
|
|
if (IS_ERR(rv) && data.ffs_data) {
|
|
ffs_release_dev(data.ffs_data);
|
|
ffs_data_put(data.ffs_data);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static void
|
|
ffs_fs_kill_sb(struct super_block *sb)
|
|
{
|
|
ENTER();
|
|
|
|
kill_litter_super(sb);
|
|
if (sb->s_fs_info) {
|
|
ffs_release_dev(sb->s_fs_info);
|
|
ffs_data_put(sb->s_fs_info);
|
|
}
|
|
}
|
|
|
|
static struct file_system_type ffs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "functionfs",
|
|
.mount = ffs_fs_mount,
|
|
.kill_sb = ffs_fs_kill_sb,
|
|
};
|
|
MODULE_ALIAS_FS("functionfs");
|
|
|
|
|
|
/* Driver's main init/cleanup functions *************************************/
|
|
|
|
static int functionfs_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ENTER();
|
|
|
|
ret = register_filesystem(&ffs_fs_type);
|
|
if (likely(!ret))
|
|
pr_info("file system registered\n");
|
|
else
|
|
pr_err("failed registering file system (%d)\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void functionfs_cleanup(void)
|
|
{
|
|
ENTER();
|
|
|
|
pr_info("unloading\n");
|
|
unregister_filesystem(&ffs_fs_type);
|
|
}
|
|
|
|
|
|
/* ffs_data and ffs_function construction and destruction code **************/
|
|
|
|
static void ffs_data_clear(struct ffs_data *ffs);
|
|
static void ffs_data_reset(struct ffs_data *ffs);
|
|
|
|
static void ffs_data_get(struct ffs_data *ffs)
|
|
{
|
|
ENTER();
|
|
|
|
atomic_inc(&ffs->ref);
|
|
}
|
|
|
|
static void ffs_data_opened(struct ffs_data *ffs)
|
|
{
|
|
ENTER();
|
|
|
|
atomic_inc(&ffs->ref);
|
|
atomic_inc(&ffs->opened);
|
|
}
|
|
|
|
static void ffs_data_put(struct ffs_data *ffs)
|
|
{
|
|
ENTER();
|
|
|
|
if (unlikely(atomic_dec_and_test(&ffs->ref))) {
|
|
pr_info("%s(): freeing\n", __func__);
|
|
ffs_data_clear(ffs);
|
|
BUG_ON(waitqueue_active(&ffs->ev.waitq) ||
|
|
waitqueue_active(&ffs->ep0req_completion.wait));
|
|
kfree(ffs->dev_name);
|
|
kfree(ffs);
|
|
}
|
|
}
|
|
|
|
static void ffs_data_closed(struct ffs_data *ffs)
|
|
{
|
|
ENTER();
|
|
|
|
if (atomic_dec_and_test(&ffs->opened)) {
|
|
ffs->state = FFS_CLOSING;
|
|
ffs_data_reset(ffs);
|
|
}
|
|
|
|
ffs_data_put(ffs);
|
|
}
|
|
|
|
static struct ffs_data *ffs_data_new(void)
|
|
{
|
|
struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL);
|
|
if (unlikely(!ffs))
|
|
return NULL;
|
|
|
|
ENTER();
|
|
|
|
atomic_set(&ffs->ref, 1);
|
|
atomic_set(&ffs->opened, 0);
|
|
ffs->state = FFS_READ_DESCRIPTORS;
|
|
mutex_init(&ffs->mutex);
|
|
spin_lock_init(&ffs->eps_lock);
|
|
init_waitqueue_head(&ffs->ev.waitq);
|
|
init_completion(&ffs->ep0req_completion);
|
|
|
|
/* XXX REVISIT need to update it in some places, or do we? */
|
|
ffs->ev.can_stall = 1;
|
|
|
|
return ffs;
|
|
}
|
|
|
|
static void ffs_data_clear(struct ffs_data *ffs)
|
|
{
|
|
ENTER();
|
|
|
|
if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags))
|
|
ffs_closed(ffs);
|
|
|
|
BUG_ON(ffs->gadget);
|
|
|
|
if (ffs->epfiles)
|
|
ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count);
|
|
|
|
kfree(ffs->raw_descs_data);
|
|
kfree(ffs->raw_strings);
|
|
kfree(ffs->stringtabs);
|
|
}
|
|
|
|
static void ffs_data_reset(struct ffs_data *ffs)
|
|
{
|
|
ENTER();
|
|
|
|
ffs_data_clear(ffs);
|
|
|
|
ffs->epfiles = NULL;
|
|
ffs->raw_descs_data = NULL;
|
|
ffs->raw_descs = NULL;
|
|
ffs->raw_strings = NULL;
|
|
ffs->stringtabs = NULL;
|
|
|
|
ffs->raw_descs_length = 0;
|
|
ffs->fs_descs_count = 0;
|
|
ffs->hs_descs_count = 0;
|
|
ffs->ss_descs_count = 0;
|
|
|
|
ffs->strings_count = 0;
|
|
ffs->interfaces_count = 0;
|
|
ffs->eps_count = 0;
|
|
|
|
ffs->ev.count = 0;
|
|
|
|
ffs->state = FFS_READ_DESCRIPTORS;
|
|
ffs->setup_state = FFS_NO_SETUP;
|
|
ffs->flags = 0;
|
|
}
|
|
|
|
|
|
static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev)
|
|
{
|
|
struct usb_gadget_strings **lang;
|
|
int first_id;
|
|
|
|
ENTER();
|
|
|
|
if (WARN_ON(ffs->state != FFS_ACTIVE
|
|
|| test_and_set_bit(FFS_FL_BOUND, &ffs->flags)))
|
|
return -EBADFD;
|
|
|
|
first_id = usb_string_ids_n(cdev, ffs->strings_count);
|
|
if (unlikely(first_id < 0))
|
|
return first_id;
|
|
|
|
ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
|
|
if (unlikely(!ffs->ep0req))
|
|
return -ENOMEM;
|
|
ffs->ep0req->complete = ffs_ep0_complete;
|
|
ffs->ep0req->context = ffs;
|
|
|
|
lang = ffs->stringtabs;
|
|
for (lang = ffs->stringtabs; *lang; ++lang) {
|
|
struct usb_string *str = (*lang)->strings;
|
|
int id = first_id;
|
|
for (; str->s; ++id, ++str)
|
|
str->id = id;
|
|
}
|
|
|
|
ffs->gadget = cdev->gadget;
|
|
ffs_data_get(ffs);
|
|
return 0;
|
|
}
|
|
|
|
static void functionfs_unbind(struct ffs_data *ffs)
|
|
{
|
|
ENTER();
|
|
|
|
if (!WARN_ON(!ffs->gadget)) {
|
|
usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req);
|
|
ffs->ep0req = NULL;
|
|
ffs->gadget = NULL;
|
|
clear_bit(FFS_FL_BOUND, &ffs->flags);
|
|
ffs_data_put(ffs);
|
|
}
|
|
}
|
|
|
|
static int ffs_epfiles_create(struct ffs_data *ffs)
|
|
{
|
|
struct ffs_epfile *epfile, *epfiles;
|
|
unsigned i, count;
|
|
|
|
ENTER();
|
|
|
|
count = ffs->eps_count;
|
|
epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL);
|
|
if (!epfiles)
|
|
return -ENOMEM;
|
|
|
|
epfile = epfiles;
|
|
for (i = 1; i <= count; ++i, ++epfile) {
|
|
epfile->ffs = ffs;
|
|
mutex_init(&epfile->mutex);
|
|
init_waitqueue_head(&epfile->wait);
|
|
sprintf(epfiles->name, "ep%u", i);
|
|
if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile,
|
|
&ffs_epfile_operations,
|
|
&epfile->dentry))) {
|
|
ffs_epfiles_destroy(epfiles, i - 1);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
ffs->epfiles = epfiles;
|
|
return 0;
|
|
}
|
|
|
|
static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count)
|
|
{
|
|
struct ffs_epfile *epfile = epfiles;
|
|
|
|
ENTER();
|
|
|
|
for (; count; --count, ++epfile) {
|
|
BUG_ON(mutex_is_locked(&epfile->mutex) ||
|
|
waitqueue_active(&epfile->wait));
|
|
if (epfile->dentry) {
|
|
d_delete(epfile->dentry);
|
|
dput(epfile->dentry);
|
|
epfile->dentry = NULL;
|
|
}
|
|
}
|
|
|
|
kfree(epfiles);
|
|
}
|
|
|
|
|
|
static void ffs_func_eps_disable(struct ffs_function *func)
|
|
{
|
|
struct ffs_ep *ep = func->eps;
|
|
struct ffs_epfile *epfile = func->ffs->epfiles;
|
|
unsigned count = func->ffs->eps_count;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&func->ffs->eps_lock, flags);
|
|
do {
|
|
/* pending requests get nuked */
|
|
if (likely(ep->ep))
|
|
usb_ep_disable(ep->ep);
|
|
epfile->ep = NULL;
|
|
|
|
++ep;
|
|
++epfile;
|
|
} while (--count);
|
|
spin_unlock_irqrestore(&func->ffs->eps_lock, flags);
|
|
}
|
|
|
|
static int ffs_func_eps_enable(struct ffs_function *func)
|
|
{
|
|
struct ffs_data *ffs = func->ffs;
|
|
struct ffs_ep *ep = func->eps;
|
|
struct ffs_epfile *epfile = ffs->epfiles;
|
|
unsigned count = ffs->eps_count;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
spin_lock_irqsave(&func->ffs->eps_lock, flags);
|
|
do {
|
|
struct usb_endpoint_descriptor *ds;
|
|
int desc_idx;
|
|
|
|
if (ffs->gadget->speed == USB_SPEED_SUPER)
|
|
desc_idx = 2;
|
|
else if (ffs->gadget->speed == USB_SPEED_HIGH)
|
|
desc_idx = 1;
|
|
else
|
|
desc_idx = 0;
|
|
|
|
/* fall-back to lower speed if desc missing for current speed */
|
|
do {
|
|
ds = ep->descs[desc_idx];
|
|
} while (!ds && --desc_idx >= 0);
|
|
|
|
if (!ds) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
ep->ep->driver_data = ep;
|
|
ep->ep->desc = ds;
|
|
ret = usb_ep_enable(ep->ep);
|
|
if (likely(!ret)) {
|
|
epfile->ep = ep;
|
|
epfile->in = usb_endpoint_dir_in(ds);
|
|
epfile->isoc = usb_endpoint_xfer_isoc(ds);
|
|
} else {
|
|
break;
|
|
}
|
|
|
|
wake_up(&epfile->wait);
|
|
|
|
++ep;
|
|
++epfile;
|
|
} while (--count);
|
|
spin_unlock_irqrestore(&func->ffs->eps_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* Parsing and building descriptors and strings *****************************/
|
|
|
|
/*
|
|
* This validates if data pointed by data is a valid USB descriptor as
|
|
* well as record how many interfaces, endpoints and strings are
|
|
* required by given configuration. Returns address after the
|
|
* descriptor or NULL if data is invalid.
|
|
*/
|
|
|
|
enum ffs_entity_type {
|
|
FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT
|
|
};
|
|
|
|
typedef int (*ffs_entity_callback)(enum ffs_entity_type entity,
|
|
u8 *valuep,
|
|
struct usb_descriptor_header *desc,
|
|
void *priv);
|
|
|
|
static int __must_check ffs_do_desc(char *data, unsigned len,
|
|
ffs_entity_callback entity, void *priv)
|
|
{
|
|
struct usb_descriptor_header *_ds = (void *)data;
|
|
u8 length;
|
|
int ret;
|
|
|
|
ENTER();
|
|
|
|
/* At least two bytes are required: length and type */
|
|
if (len < 2) {
|
|
pr_vdebug("descriptor too short\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* If we have at least as many bytes as the descriptor takes? */
|
|
length = _ds->bLength;
|
|
if (len < length) {
|
|
pr_vdebug("descriptor longer then available data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
#define __entity_check_INTERFACE(val) 1
|
|
#define __entity_check_STRING(val) (val)
|
|
#define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK)
|
|
#define __entity(type, val) do { \
|
|
pr_vdebug("entity " #type "(%02x)\n", (val)); \
|
|
if (unlikely(!__entity_check_ ##type(val))) { \
|
|
pr_vdebug("invalid entity's value\n"); \
|
|
return -EINVAL; \
|
|
} \
|
|
ret = entity(FFS_ ##type, &val, _ds, priv); \
|
|
if (unlikely(ret < 0)) { \
|
|
pr_debug("entity " #type "(%02x); ret = %d\n", \
|
|
(val), ret); \
|
|
return ret; \
|
|
} \
|
|
} while (0)
|
|
|
|
/* Parse descriptor depending on type. */
|
|
switch (_ds->bDescriptorType) {
|
|
case USB_DT_DEVICE:
|
|
case USB_DT_CONFIG:
|
|
case USB_DT_STRING:
|
|
case USB_DT_DEVICE_QUALIFIER:
|
|
/* function can't have any of those */
|
|
pr_vdebug("descriptor reserved for gadget: %d\n",
|
|
_ds->bDescriptorType);
|
|
return -EINVAL;
|
|
|
|
case USB_DT_INTERFACE: {
|
|
struct usb_interface_descriptor *ds = (void *)_ds;
|
|
pr_vdebug("interface descriptor\n");
|
|
if (length != sizeof *ds)
|
|
goto inv_length;
|
|
|
|
__entity(INTERFACE, ds->bInterfaceNumber);
|
|
if (ds->iInterface)
|
|
__entity(STRING, ds->iInterface);
|
|
}
|
|
break;
|
|
|
|
case USB_DT_ENDPOINT: {
|
|
struct usb_endpoint_descriptor *ds = (void *)_ds;
|
|
pr_vdebug("endpoint descriptor\n");
|
|
if (length != USB_DT_ENDPOINT_SIZE &&
|
|
length != USB_DT_ENDPOINT_AUDIO_SIZE)
|
|
goto inv_length;
|
|
__entity(ENDPOINT, ds->bEndpointAddress);
|
|
}
|
|
break;
|
|
|
|
case HID_DT_HID:
|
|
pr_vdebug("hid descriptor\n");
|
|
if (length != sizeof(struct hid_descriptor))
|
|
goto inv_length;
|
|
break;
|
|
|
|
case USB_DT_OTG:
|
|
if (length != sizeof(struct usb_otg_descriptor))
|
|
goto inv_length;
|
|
break;
|
|
|
|
case USB_DT_INTERFACE_ASSOCIATION: {
|
|
struct usb_interface_assoc_descriptor *ds = (void *)_ds;
|
|
pr_vdebug("interface association descriptor\n");
|
|
if (length != sizeof *ds)
|
|
goto inv_length;
|
|
if (ds->iFunction)
|
|
__entity(STRING, ds->iFunction);
|
|
}
|
|
break;
|
|
|
|
case USB_DT_SS_ENDPOINT_COMP:
|
|
pr_vdebug("EP SS companion descriptor\n");
|
|
if (length != sizeof(struct usb_ss_ep_comp_descriptor))
|
|
goto inv_length;
|
|
break;
|
|
|
|
case USB_DT_OTHER_SPEED_CONFIG:
|
|
case USB_DT_INTERFACE_POWER:
|
|
case USB_DT_DEBUG:
|
|
case USB_DT_SECURITY:
|
|
case USB_DT_CS_RADIO_CONTROL:
|
|
/* TODO */
|
|
pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType);
|
|
return -EINVAL;
|
|
|
|
default:
|
|
/* We should never be here */
|
|
pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType);
|
|
return -EINVAL;
|
|
|
|
inv_length:
|
|
pr_vdebug("invalid length: %d (descriptor %d)\n",
|
|
_ds->bLength, _ds->bDescriptorType);
|
|
return -EINVAL;
|
|
}
|
|
|
|
#undef __entity
|
|
#undef __entity_check_DESCRIPTOR
|
|
#undef __entity_check_INTERFACE
|
|
#undef __entity_check_STRING
|
|
#undef __entity_check_ENDPOINT
|
|
|
|
return length;
|
|
}
|
|
|
|
static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len,
|
|
ffs_entity_callback entity, void *priv)
|
|
{
|
|
const unsigned _len = len;
|
|
unsigned long num = 0;
|
|
|
|
ENTER();
|
|
|
|
for (;;) {
|
|
int ret;
|
|
|
|
if (num == count)
|
|
data = NULL;
|
|
|
|
/* Record "descriptor" entity */
|
|
ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv);
|
|
if (unlikely(ret < 0)) {
|
|
pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n",
|
|
num, ret);
|
|
return ret;
|
|
}
|
|
|
|
if (!data)
|
|
return _len - len;
|
|
|
|
ret = ffs_do_desc(data, len, entity, priv);
|
|
if (unlikely(ret < 0)) {
|
|
pr_debug("%s returns %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
len -= ret;
|
|
data += ret;
|
|
++num;
|
|
}
|
|
}
|
|
|
|
static int __ffs_data_do_entity(enum ffs_entity_type type,
|
|
u8 *valuep, struct usb_descriptor_header *desc,
|
|
void *priv)
|
|
{
|
|
struct ffs_data *ffs = priv;
|
|
|
|
ENTER();
|
|
|
|
switch (type) {
|
|
case FFS_DESCRIPTOR:
|
|
break;
|
|
|
|
case FFS_INTERFACE:
|
|
/*
|
|
* Interfaces are indexed from zero so if we
|
|
* encountered interface "n" then there are at least
|
|
* "n+1" interfaces.
|
|
*/
|
|
if (*valuep >= ffs->interfaces_count)
|
|
ffs->interfaces_count = *valuep + 1;
|
|
break;
|
|
|
|
case FFS_STRING:
|
|
/*
|
|
* Strings are indexed from 1 (0 is magic ;) reserved
|
|
* for languages list or some such)
|
|
*/
|
|
if (*valuep > ffs->strings_count)
|
|
ffs->strings_count = *valuep;
|
|
break;
|
|
|
|
case FFS_ENDPOINT:
|
|
/* Endpoints are indexed from 1 as well. */
|
|
if ((*valuep & USB_ENDPOINT_NUMBER_MASK) > ffs->eps_count)
|
|
ffs->eps_count = (*valuep & USB_ENDPOINT_NUMBER_MASK);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __ffs_data_got_descs(struct ffs_data *ffs,
|
|
char *const _data, size_t len)
|
|
{
|
|
char *data = _data, *raw_descs;
|
|
unsigned counts[3], flags;
|
|
int ret = -EINVAL, i;
|
|
|
|
ENTER();
|
|
|
|
if (get_unaligned_le32(data + 4) != len)
|
|
goto error;
|
|
|
|
switch (get_unaligned_le32(data)) {
|
|
case FUNCTIONFS_DESCRIPTORS_MAGIC:
|
|
flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC;
|
|
data += 8;
|
|
len -= 8;
|
|
break;
|
|
case FUNCTIONFS_DESCRIPTORS_MAGIC_V2:
|
|
flags = get_unaligned_le32(data + 8);
|
|
if (flags & ~(FUNCTIONFS_HAS_FS_DESC |
|
|
FUNCTIONFS_HAS_HS_DESC |
|
|
FUNCTIONFS_HAS_SS_DESC)) {
|
|
ret = -ENOSYS;
|
|
goto error;
|
|
}
|
|
data += 12;
|
|
len -= 12;
|
|
break;
|
|
default:
|
|
goto error;
|
|
}
|
|
|
|
/* Read fs_count, hs_count and ss_count (if present) */
|
|
for (i = 0; i < 3; ++i) {
|
|
if (!(flags & (1 << i))) {
|
|
counts[i] = 0;
|
|
} else if (len < 4) {
|
|
goto error;
|
|
} else {
|
|
counts[i] = get_unaligned_le32(data);
|
|
data += 4;
|
|
len -= 4;
|
|
}
|
|
}
|
|
|
|
/* Read descriptors */
|
|
raw_descs = data;
|
|
for (i = 0; i < 3; ++i) {
|
|
if (!counts[i])
|
|
continue;
|
|
ret = ffs_do_descs(counts[i], data, len,
|
|
__ffs_data_do_entity, ffs);
|
|
if (ret < 0)
|
|
goto error;
|
|
data += ret;
|
|
len -= ret;
|
|
}
|
|
|
|
if (raw_descs == data || len) {
|
|
ret = -EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
ffs->raw_descs_data = _data;
|
|
ffs->raw_descs = raw_descs;
|
|
ffs->raw_descs_length = data - raw_descs;
|
|
ffs->fs_descs_count = counts[0];
|
|
ffs->hs_descs_count = counts[1];
|
|
ffs->ss_descs_count = counts[2];
|
|
|
|
return 0;
|
|
|
|
error:
|
|
kfree(_data);
|
|
return ret;
|
|
}
|
|
|
|
static int __ffs_data_got_strings(struct ffs_data *ffs,
|
|
char *const _data, size_t len)
|
|
{
|
|
u32 str_count, needed_count, lang_count;
|
|
struct usb_gadget_strings **stringtabs, *t;
|
|
struct usb_string *strings, *s;
|
|
const char *data = _data;
|
|
|
|
ENTER();
|
|
|
|
if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC ||
|
|
get_unaligned_le32(data + 4) != len))
|
|
goto error;
|
|
str_count = get_unaligned_le32(data + 8);
|
|
lang_count = get_unaligned_le32(data + 12);
|
|
|
|
/* if one is zero the other must be zero */
|
|
if (unlikely(!str_count != !lang_count))
|
|
goto error;
|
|
|
|
/* Do we have at least as many strings as descriptors need? */
|
|
needed_count = ffs->strings_count;
|
|
if (unlikely(str_count < needed_count))
|
|
goto error;
|
|
|
|
/*
|
|
* If we don't need any strings just return and free all
|
|
* memory.
|
|
*/
|
|
if (!needed_count) {
|
|
kfree(_data);
|
|
return 0;
|
|
}
|
|
|
|
/* Allocate everything in one chunk so there's less maintenance. */
|
|
{
|
|
unsigned i = 0;
|
|
vla_group(d);
|
|
vla_item(d, struct usb_gadget_strings *, stringtabs,
|
|
lang_count + 1);
|
|
vla_item(d, struct usb_gadget_strings, stringtab, lang_count);
|
|
vla_item(d, struct usb_string, strings,
|
|
lang_count*(needed_count+1));
|
|
|
|
char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL);
|
|
|
|
if (unlikely(!vlabuf)) {
|
|
kfree(_data);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Initialize the VLA pointers */
|
|
stringtabs = vla_ptr(vlabuf, d, stringtabs);
|
|
t = vla_ptr(vlabuf, d, stringtab);
|
|
i = lang_count;
|
|
do {
|
|
*stringtabs++ = t++;
|
|
} while (--i);
|
|
*stringtabs = NULL;
|
|
|
|
/* stringtabs = vlabuf = d_stringtabs for later kfree */
|
|
stringtabs = vla_ptr(vlabuf, d, stringtabs);
|
|
t = vla_ptr(vlabuf, d, stringtab);
|
|
s = vla_ptr(vlabuf, d, strings);
|
|
strings = s;
|
|
}
|
|
|
|
/* For each language */
|
|
data += 16;
|
|
len -= 16;
|
|
|
|
do { /* lang_count > 0 so we can use do-while */
|
|
unsigned needed = needed_count;
|
|
|
|
if (unlikely(len < 3))
|
|
goto error_free;
|
|
t->language = get_unaligned_le16(data);
|
|
t->strings = s;
|
|
++t;
|
|
|
|
data += 2;
|
|
len -= 2;
|
|
|
|
/* For each string */
|
|
do { /* str_count > 0 so we can use do-while */
|
|
size_t length = strnlen(data, len);
|
|
|
|
if (unlikely(length == len))
|
|
goto error_free;
|
|
|
|
/*
|
|
* User may provide more strings then we need,
|
|
* if that's the case we simply ignore the
|
|
* rest
|
|
*/
|
|
if (likely(needed)) {
|
|
/*
|
|
* s->id will be set while adding
|
|
* function to configuration so for
|
|
* now just leave garbage here.
|
|
*/
|
|
s->s = data;
|
|
--needed;
|
|
++s;
|
|
}
|
|
|
|
data += length + 1;
|
|
len -= length + 1;
|
|
} while (--str_count);
|
|
|
|
s->id = 0; /* terminator */
|
|
s->s = NULL;
|
|
++s;
|
|
|
|
} while (--lang_count);
|
|
|
|
/* Some garbage left? */
|
|
if (unlikely(len))
|
|
goto error_free;
|
|
|
|
/* Done! */
|
|
ffs->stringtabs = stringtabs;
|
|
ffs->raw_strings = _data;
|
|
|
|
return 0;
|
|
|
|
error_free:
|
|
kfree(stringtabs);
|
|
error:
|
|
kfree(_data);
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
/* Events handling and management *******************************************/
|
|
|
|
static void __ffs_event_add(struct ffs_data *ffs,
|
|
enum usb_functionfs_event_type type)
|
|
{
|
|
enum usb_functionfs_event_type rem_type1, rem_type2 = type;
|
|
int neg = 0;
|
|
|
|
/*
|
|
* Abort any unhandled setup
|
|
*
|
|
* We do not need to worry about some cmpxchg() changing value
|
|
* of ffs->setup_state without holding the lock because when
|
|
* state is FFS_SETUP_PENDING cmpxchg() in several places in
|
|
* the source does nothing.
|
|
*/
|
|
if (ffs->setup_state == FFS_SETUP_PENDING)
|
|
ffs->setup_state = FFS_SETUP_CANCELLED;
|
|
|
|
switch (type) {
|
|
case FUNCTIONFS_RESUME:
|
|
rem_type2 = FUNCTIONFS_SUSPEND;
|
|
/* FALL THROUGH */
|
|
case FUNCTIONFS_SUSPEND:
|
|
case FUNCTIONFS_SETUP:
|
|
rem_type1 = type;
|
|
/* Discard all similar events */
|
|
break;
|
|
|
|
case FUNCTIONFS_BIND:
|
|
case FUNCTIONFS_UNBIND:
|
|
case FUNCTIONFS_DISABLE:
|
|
case FUNCTIONFS_ENABLE:
|
|
/* Discard everything other then power management. */
|
|
rem_type1 = FUNCTIONFS_SUSPEND;
|
|
rem_type2 = FUNCTIONFS_RESUME;
|
|
neg = 1;
|
|
break;
|
|
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
{
|
|
u8 *ev = ffs->ev.types, *out = ev;
|
|
unsigned n = ffs->ev.count;
|
|
for (; n; --n, ++ev)
|
|
if ((*ev == rem_type1 || *ev == rem_type2) == neg)
|
|
*out++ = *ev;
|
|
else
|
|
pr_vdebug("purging event %d\n", *ev);
|
|
ffs->ev.count = out - ffs->ev.types;
|
|
}
|
|
|
|
pr_vdebug("adding event %d\n", type);
|
|
ffs->ev.types[ffs->ev.count++] = type;
|
|
wake_up_locked(&ffs->ev.waitq);
|
|
}
|
|
|
|
static void ffs_event_add(struct ffs_data *ffs,
|
|
enum usb_functionfs_event_type type)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&ffs->ev.waitq.lock, flags);
|
|
__ffs_event_add(ffs, type);
|
|
spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags);
|
|
}
|
|
|
|
|
|
/* Bind/unbind USB function hooks *******************************************/
|
|
|
|
static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep,
|
|
struct usb_descriptor_header *desc,
|
|
void *priv)
|
|
{
|
|
struct usb_endpoint_descriptor *ds = (void *)desc;
|
|
struct ffs_function *func = priv;
|
|
struct ffs_ep *ffs_ep;
|
|
unsigned ep_desc_id, idx;
|
|
static const char *speed_names[] = { "full", "high", "super" };
|
|
|
|
if (type != FFS_DESCRIPTOR)
|
|
return 0;
|
|
|
|
/*
|
|
* If ss_descriptors is not NULL, we are reading super speed
|
|
* descriptors; if hs_descriptors is not NULL, we are reading high
|
|
* speed descriptors; otherwise, we are reading full speed
|
|
* descriptors.
|
|
*/
|
|
if (func->function.ss_descriptors) {
|
|
ep_desc_id = 2;
|
|
func->function.ss_descriptors[(long)valuep] = desc;
|
|
} else if (func->function.hs_descriptors) {
|
|
ep_desc_id = 1;
|
|
func->function.hs_descriptors[(long)valuep] = desc;
|
|
} else {
|
|
ep_desc_id = 0;
|
|
func->function.fs_descriptors[(long)valuep] = desc;
|
|
}
|
|
|
|
if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT)
|
|
return 0;
|
|
|
|
idx = (ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) - 1;
|
|
ffs_ep = func->eps + idx;
|
|
|
|
if (unlikely(ffs_ep->descs[ep_desc_id])) {
|
|
pr_err("two %sspeed descriptors for EP %d\n",
|
|
speed_names[ep_desc_id],
|
|
ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
|
|
return -EINVAL;
|
|
}
|
|
ffs_ep->descs[ep_desc_id] = ds;
|
|
|
|
ffs_dump_mem(": Original ep desc", ds, ds->bLength);
|
|
if (ffs_ep->ep) {
|
|
ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress;
|
|
if (!ds->wMaxPacketSize)
|
|
ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize;
|
|
} else {
|
|
struct usb_request *req;
|
|
struct usb_ep *ep;
|
|
|
|
pr_vdebug("autoconfig\n");
|
|
ep = usb_ep_autoconfig(func->gadget, ds);
|
|
if (unlikely(!ep))
|
|
return -ENOTSUPP;
|
|
ep->driver_data = func->eps + idx;
|
|
|
|
req = usb_ep_alloc_request(ep, GFP_KERNEL);
|
|
if (unlikely(!req))
|
|
return -ENOMEM;
|
|
|
|
ffs_ep->ep = ep;
|
|
ffs_ep->req = req;
|
|
func->eps_revmap[ds->bEndpointAddress &
|
|
USB_ENDPOINT_NUMBER_MASK] = idx + 1;
|
|
}
|
|
ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep,
|
|
struct usb_descriptor_header *desc,
|
|
void *priv)
|
|
{
|
|
struct ffs_function *func = priv;
|
|
unsigned idx;
|
|
u8 newValue;
|
|
|
|
switch (type) {
|
|
default:
|
|
case FFS_DESCRIPTOR:
|
|
/* Handled in previous pass by __ffs_func_bind_do_descs() */
|
|
return 0;
|
|
|
|
case FFS_INTERFACE:
|
|
idx = *valuep;
|
|
if (func->interfaces_nums[idx] < 0) {
|
|
int id = usb_interface_id(func->conf, &func->function);
|
|
if (unlikely(id < 0))
|
|
return id;
|
|
func->interfaces_nums[idx] = id;
|
|
}
|
|
newValue = func->interfaces_nums[idx];
|
|
break;
|
|
|
|
case FFS_STRING:
|
|
/* String' IDs are allocated when fsf_data is bound to cdev */
|
|
newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id;
|
|
break;
|
|
|
|
case FFS_ENDPOINT:
|
|
/*
|
|
* USB_DT_ENDPOINT are handled in
|
|
* __ffs_func_bind_do_descs().
|
|
*/
|
|
if (desc->bDescriptorType == USB_DT_ENDPOINT)
|
|
return 0;
|
|
|
|
idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1;
|
|
if (unlikely(!func->eps[idx].ep))
|
|
return -EINVAL;
|
|
|
|
{
|
|
struct usb_endpoint_descriptor **descs;
|
|
descs = func->eps[idx].descs;
|
|
newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress;
|
|
}
|
|
break;
|
|
}
|
|
|
|
pr_vdebug("%02x -> %02x\n", *valuep, newValue);
|
|
*valuep = newValue;
|
|
return 0;
|
|
}
|
|
|
|
static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f,
|
|
struct usb_configuration *c)
|
|
{
|
|
struct ffs_function *func = ffs_func_from_usb(f);
|
|
struct f_fs_opts *ffs_opts =
|
|
container_of(f->fi, struct f_fs_opts, func_inst);
|
|
int ret;
|
|
|
|
ENTER();
|
|
|
|
/*
|
|
* Legacy gadget triggers binding in functionfs_ready_callback,
|
|
* which already uses locking; taking the same lock here would
|
|
* cause a deadlock.
|
|
*
|
|
* Configfs-enabled gadgets however do need ffs_dev_lock.
|
|
*/
|
|
if (!ffs_opts->no_configfs)
|
|
ffs_dev_lock();
|
|
ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV;
|
|
func->ffs = ffs_opts->dev->ffs_data;
|
|
if (!ffs_opts->no_configfs)
|
|
ffs_dev_unlock();
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
func->conf = c;
|
|
func->gadget = c->cdev->gadget;
|
|
|
|
ffs_data_get(func->ffs);
|
|
|
|
/*
|
|
* in drivers/usb/gadget/configfs.c:configfs_composite_bind()
|
|
* configurations are bound in sequence with list_for_each_entry,
|
|
* in each configuration its functions are bound in sequence
|
|
* with list_for_each_entry, so we assume no race condition
|
|
* with regard to ffs_opts->bound access
|
|
*/
|
|
if (!ffs_opts->refcnt) {
|
|
ret = functionfs_bind(func->ffs, c->cdev);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
}
|
|
ffs_opts->refcnt++;
|
|
func->function.strings = func->ffs->stringtabs;
|
|
|
|
return ffs_opts;
|
|
}
|
|
|
|
static int _ffs_func_bind(struct usb_configuration *c,
|
|
struct usb_function *f)
|
|
{
|
|
struct ffs_function *func = ffs_func_from_usb(f);
|
|
struct ffs_data *ffs = func->ffs;
|
|
|
|
const int full = !!func->ffs->fs_descs_count;
|
|
const int high = gadget_is_dualspeed(func->gadget) &&
|
|
func->ffs->hs_descs_count;
|
|
const int super = gadget_is_superspeed(func->gadget) &&
|
|
func->ffs->ss_descs_count;
|
|
|
|
int fs_len, hs_len, ret;
|
|
|
|
/* Make it a single chunk, less management later on */
|
|
vla_group(d);
|
|
vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count);
|
|
vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs,
|
|
full ? ffs->fs_descs_count + 1 : 0);
|
|
vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs,
|
|
high ? ffs->hs_descs_count + 1 : 0);
|
|
vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs,
|
|
super ? ffs->ss_descs_count + 1 : 0);
|
|
vla_item_with_sz(d, short, inums, ffs->interfaces_count);
|
|
vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length);
|
|
char *vlabuf;
|
|
|
|
ENTER();
|
|
|
|
/* Has descriptors only for speeds gadget does not support */
|
|
if (unlikely(!(full | high | super)))
|
|
return -ENOTSUPP;
|
|
|
|
/* Allocate a single chunk, less management later on */
|
|
vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL);
|
|
if (unlikely(!vlabuf))
|
|
return -ENOMEM;
|
|
|
|
/* Zero */
|
|
memset(vla_ptr(vlabuf, d, eps), 0, d_eps__sz);
|
|
/* Copy descriptors */
|
|
memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs,
|
|
ffs->raw_descs_length);
|
|
|
|
memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz);
|
|
for (ret = ffs->eps_count; ret; --ret) {
|
|
struct ffs_ep *ptr;
|
|
|
|
ptr = vla_ptr(vlabuf, d, eps);
|
|
ptr[ret].num = -1;
|
|
}
|
|
|
|
/* Save pointers
|
|
* d_eps == vlabuf, func->eps used to kfree vlabuf later
|
|
*/
|
|
func->eps = vla_ptr(vlabuf, d, eps);
|
|
func->interfaces_nums = vla_ptr(vlabuf, d, inums);
|
|
|
|
/*
|
|
* Go through all the endpoint descriptors and allocate
|
|
* endpoints first, so that later we can rewrite the endpoint
|
|
* numbers without worrying that it may be described later on.
|
|
*/
|
|
if (likely(full)) {
|
|
func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs);
|
|
fs_len = ffs_do_descs(ffs->fs_descs_count,
|
|
vla_ptr(vlabuf, d, raw_descs),
|
|
d_raw_descs__sz,
|
|
__ffs_func_bind_do_descs, func);
|
|
if (unlikely(fs_len < 0)) {
|
|
ret = fs_len;
|
|
goto error;
|
|
}
|
|
} else {
|
|
fs_len = 0;
|
|
}
|
|
|
|
if (likely(high)) {
|
|
func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs);
|
|
hs_len = ffs_do_descs(ffs->hs_descs_count,
|
|
vla_ptr(vlabuf, d, raw_descs) + fs_len,
|
|
d_raw_descs__sz - fs_len,
|
|
__ffs_func_bind_do_descs, func);
|
|
if (unlikely(hs_len < 0)) {
|
|
ret = hs_len;
|
|
goto error;
|
|
}
|
|
} else {
|
|
hs_len = 0;
|
|
}
|
|
|
|
if (likely(super)) {
|
|
func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs);
|
|
ret = ffs_do_descs(ffs->ss_descs_count,
|
|
vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len,
|
|
d_raw_descs__sz - fs_len - hs_len,
|
|
__ffs_func_bind_do_descs, func);
|
|
if (unlikely(ret < 0))
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* Now handle interface numbers allocation and interface and
|
|
* endpoint numbers rewriting. We can do that in one go
|
|
* now.
|
|
*/
|
|
ret = ffs_do_descs(ffs->fs_descs_count +
|
|
(high ? ffs->hs_descs_count : 0) +
|
|
(super ? ffs->ss_descs_count : 0),
|
|
vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz,
|
|
__ffs_func_bind_do_nums, func);
|
|
if (unlikely(ret < 0))
|
|
goto error;
|
|
|
|
/* And we're done */
|
|
ffs_event_add(ffs, FUNCTIONFS_BIND);
|
|
return 0;
|
|
|
|
error:
|
|
/* XXX Do we need to release all claimed endpoints here? */
|
|
return ret;
|
|
}
|
|
|
|
static int ffs_func_bind(struct usb_configuration *c,
|
|
struct usb_function *f)
|
|
{
|
|
struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c);
|
|
|
|
if (IS_ERR(ffs_opts))
|
|
return PTR_ERR(ffs_opts);
|
|
|
|
return _ffs_func_bind(c, f);
|
|
}
|
|
|
|
|
|
/* Other USB function hooks *************************************************/
|
|
|
|
static int ffs_func_set_alt(struct usb_function *f,
|
|
unsigned interface, unsigned alt)
|
|
{
|
|
struct ffs_function *func = ffs_func_from_usb(f);
|
|
struct ffs_data *ffs = func->ffs;
|
|
int ret = 0, intf;
|
|
|
|
if (alt != (unsigned)-1) {
|
|
intf = ffs_func_revmap_intf(func, interface);
|
|
if (unlikely(intf < 0))
|
|
return intf;
|
|
}
|
|
|
|
if (ffs->func)
|
|
ffs_func_eps_disable(ffs->func);
|
|
|
|
if (ffs->state != FFS_ACTIVE)
|
|
return -ENODEV;
|
|
|
|
if (alt == (unsigned)-1) {
|
|
ffs->func = NULL;
|
|
ffs_event_add(ffs, FUNCTIONFS_DISABLE);
|
|
return 0;
|
|
}
|
|
|
|
ffs->func = func;
|
|
ret = ffs_func_eps_enable(func);
|
|
if (likely(ret >= 0))
|
|
ffs_event_add(ffs, FUNCTIONFS_ENABLE);
|
|
return ret;
|
|
}
|
|
|
|
static void ffs_func_disable(struct usb_function *f)
|
|
{
|
|
ffs_func_set_alt(f, 0, (unsigned)-1);
|
|
}
|
|
|
|
static int ffs_func_setup(struct usb_function *f,
|
|
const struct usb_ctrlrequest *creq)
|
|
{
|
|
struct ffs_function *func = ffs_func_from_usb(f);
|
|
struct ffs_data *ffs = func->ffs;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
ENTER();
|
|
|
|
pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType);
|
|
pr_vdebug("creq->bRequest = %02x\n", creq->bRequest);
|
|
pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue));
|
|
pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex));
|
|
pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength));
|
|
|
|
/*
|
|
* Most requests directed to interface go through here
|
|
* (notable exceptions are set/get interface) so we need to
|
|
* handle them. All other either handled by composite or
|
|
* passed to usb_configuration->setup() (if one is set). No
|
|
* matter, we will handle requests directed to endpoint here
|
|
* as well (as it's straightforward) but what to do with any
|
|
* other request?
|
|
*/
|
|
if (ffs->state != FFS_ACTIVE)
|
|
return -ENODEV;
|
|
|
|
switch (creq->bRequestType & USB_RECIP_MASK) {
|
|
case USB_RECIP_INTERFACE:
|
|
ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex));
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
break;
|
|
|
|
case USB_RECIP_ENDPOINT:
|
|
ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex));
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
break;
|
|
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
spin_lock_irqsave(&ffs->ev.waitq.lock, flags);
|
|
ffs->ev.setup = *creq;
|
|
ffs->ev.setup.wIndex = cpu_to_le16(ret);
|
|
__ffs_event_add(ffs, FUNCTIONFS_SETUP);
|
|
spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ffs_func_suspend(struct usb_function *f)
|
|
{
|
|
ENTER();
|
|
ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND);
|
|
}
|
|
|
|
static void ffs_func_resume(struct usb_function *f)
|
|
{
|
|
ENTER();
|
|
ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME);
|
|
}
|
|
|
|
|
|
/* Endpoint and interface numbers reverse mapping ***************************/
|
|
|
|
static int ffs_func_revmap_ep(struct ffs_function *func, u8 num)
|
|
{
|
|
num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK];
|
|
return num ? num : -EDOM;
|
|
}
|
|
|
|
static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf)
|
|
{
|
|
short *nums = func->interfaces_nums;
|
|
unsigned count = func->ffs->interfaces_count;
|
|
|
|
for (; count; --count, ++nums) {
|
|
if (*nums >= 0 && *nums == intf)
|
|
return nums - func->interfaces_nums;
|
|
}
|
|
|
|
return -EDOM;
|
|
}
|
|
|
|
|
|
/* Devices management *******************************************************/
|
|
|
|
static LIST_HEAD(ffs_devices);
|
|
|
|
static struct ffs_dev *_ffs_do_find_dev(const char *name)
|
|
{
|
|
struct ffs_dev *dev;
|
|
|
|
list_for_each_entry(dev, &ffs_devices, entry) {
|
|
if (!dev->name || !name)
|
|
continue;
|
|
if (strcmp(dev->name, name) == 0)
|
|
return dev;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* ffs_lock must be taken by the caller of this function
|
|
*/
|
|
static struct ffs_dev *_ffs_get_single_dev(void)
|
|
{
|
|
struct ffs_dev *dev;
|
|
|
|
if (list_is_singular(&ffs_devices)) {
|
|
dev = list_first_entry(&ffs_devices, struct ffs_dev, entry);
|
|
if (dev->single)
|
|
return dev;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* ffs_lock must be taken by the caller of this function
|
|
*/
|
|
static struct ffs_dev *_ffs_find_dev(const char *name)
|
|
{
|
|
struct ffs_dev *dev;
|
|
|
|
dev = _ffs_get_single_dev();
|
|
if (dev)
|
|
return dev;
|
|
|
|
return _ffs_do_find_dev(name);
|
|
}
|
|
|
|
/* Configfs support *********************************************************/
|
|
|
|
static inline struct f_fs_opts *to_ffs_opts(struct config_item *item)
|
|
{
|
|
return container_of(to_config_group(item), struct f_fs_opts,
|
|
func_inst.group);
|
|
}
|
|
|
|
static void ffs_attr_release(struct config_item *item)
|
|
{
|
|
struct f_fs_opts *opts = to_ffs_opts(item);
|
|
|
|
usb_put_function_instance(&opts->func_inst);
|
|
}
|
|
|
|
static struct configfs_item_operations ffs_item_ops = {
|
|
.release = ffs_attr_release,
|
|
};
|
|
|
|
static struct config_item_type ffs_func_type = {
|
|
.ct_item_ops = &ffs_item_ops,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
|
|
/* Function registration interface ******************************************/
|
|
|
|
static void ffs_free_inst(struct usb_function_instance *f)
|
|
{
|
|
struct f_fs_opts *opts;
|
|
|
|
opts = to_f_fs_opts(f);
|
|
ffs_dev_lock();
|
|
_ffs_free_dev(opts->dev);
|
|
ffs_dev_unlock();
|
|
kfree(opts);
|
|
}
|
|
|
|
#define MAX_INST_NAME_LEN 40
|
|
|
|
static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name)
|
|
{
|
|
struct f_fs_opts *opts;
|
|
char *ptr;
|
|
const char *tmp;
|
|
int name_len, ret;
|
|
|
|
name_len = strlen(name) + 1;
|
|
if (name_len > MAX_INST_NAME_LEN)
|
|
return -ENAMETOOLONG;
|
|
|
|
ptr = kstrndup(name, name_len, GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
opts = to_f_fs_opts(fi);
|
|
tmp = NULL;
|
|
|
|
ffs_dev_lock();
|
|
|
|
tmp = opts->dev->name_allocated ? opts->dev->name : NULL;
|
|
ret = _ffs_name_dev(opts->dev, ptr);
|
|
if (ret) {
|
|
kfree(ptr);
|
|
ffs_dev_unlock();
|
|
return ret;
|
|
}
|
|
opts->dev->name_allocated = true;
|
|
|
|
ffs_dev_unlock();
|
|
|
|
kfree(tmp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct usb_function_instance *ffs_alloc_inst(void)
|
|
{
|
|
struct f_fs_opts *opts;
|
|
struct ffs_dev *dev;
|
|
|
|
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
|
|
if (!opts)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
opts->func_inst.set_inst_name = ffs_set_inst_name;
|
|
opts->func_inst.free_func_inst = ffs_free_inst;
|
|
ffs_dev_lock();
|
|
dev = _ffs_alloc_dev();
|
|
ffs_dev_unlock();
|
|
if (IS_ERR(dev)) {
|
|
kfree(opts);
|
|
return ERR_CAST(dev);
|
|
}
|
|
opts->dev = dev;
|
|
dev->opts = opts;
|
|
|
|
config_group_init_type_name(&opts->func_inst.group, "",
|
|
&ffs_func_type);
|
|
return &opts->func_inst;
|
|
}
|
|
|
|
static void ffs_free(struct usb_function *f)
|
|
{
|
|
kfree(ffs_func_from_usb(f));
|
|
}
|
|
|
|
static void ffs_func_unbind(struct usb_configuration *c,
|
|
struct usb_function *f)
|
|
{
|
|
struct ffs_function *func = ffs_func_from_usb(f);
|
|
struct ffs_data *ffs = func->ffs;
|
|
struct f_fs_opts *opts =
|
|
container_of(f->fi, struct f_fs_opts, func_inst);
|
|
struct ffs_ep *ep = func->eps;
|
|
unsigned count = ffs->eps_count;
|
|
unsigned long flags;
|
|
|
|
ENTER();
|
|
if (ffs->func == func) {
|
|
ffs_func_eps_disable(func);
|
|
ffs->func = NULL;
|
|
}
|
|
|
|
if (!--opts->refcnt)
|
|
functionfs_unbind(ffs);
|
|
|
|
/* cleanup after autoconfig */
|
|
spin_lock_irqsave(&func->ffs->eps_lock, flags);
|
|
do {
|
|
if (ep->ep && ep->req)
|
|
usb_ep_free_request(ep->ep, ep->req);
|
|
ep->req = NULL;
|
|
++ep;
|
|
} while (--count);
|
|
spin_unlock_irqrestore(&func->ffs->eps_lock, flags);
|
|
kfree(func->eps);
|
|
func->eps = NULL;
|
|
/*
|
|
* eps, descriptors and interfaces_nums are allocated in the
|
|
* same chunk so only one free is required.
|
|
*/
|
|
func->function.fs_descriptors = NULL;
|
|
func->function.hs_descriptors = NULL;
|
|
func->function.ss_descriptors = NULL;
|
|
func->interfaces_nums = NULL;
|
|
|
|
ffs_event_add(ffs, FUNCTIONFS_UNBIND);
|
|
}
|
|
|
|
static struct usb_function *ffs_alloc(struct usb_function_instance *fi)
|
|
{
|
|
struct ffs_function *func;
|
|
|
|
ENTER();
|
|
|
|
func = kzalloc(sizeof(*func), GFP_KERNEL);
|
|
if (unlikely(!func))
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
func->function.name = "Function FS Gadget";
|
|
|
|
func->function.bind = ffs_func_bind;
|
|
func->function.unbind = ffs_func_unbind;
|
|
func->function.set_alt = ffs_func_set_alt;
|
|
func->function.disable = ffs_func_disable;
|
|
func->function.setup = ffs_func_setup;
|
|
func->function.suspend = ffs_func_suspend;
|
|
func->function.resume = ffs_func_resume;
|
|
func->function.free_func = ffs_free;
|
|
|
|
return &func->function;
|
|
}
|
|
|
|
/*
|
|
* ffs_lock must be taken by the caller of this function
|
|
*/
|
|
static struct ffs_dev *_ffs_alloc_dev(void)
|
|
{
|
|
struct ffs_dev *dev;
|
|
int ret;
|
|
|
|
if (_ffs_get_single_dev())
|
|
return ERR_PTR(-EBUSY);
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (list_empty(&ffs_devices)) {
|
|
ret = functionfs_init();
|
|
if (ret) {
|
|
kfree(dev);
|
|
return ERR_PTR(ret);
|
|
}
|
|
}
|
|
|
|
list_add(&dev->entry, &ffs_devices);
|
|
|
|
return dev;
|
|
}
|
|
|
|
/*
|
|
* ffs_lock must be taken by the caller of this function
|
|
* The caller is responsible for "name" being available whenever f_fs needs it
|
|
*/
|
|
static int _ffs_name_dev(struct ffs_dev *dev, const char *name)
|
|
{
|
|
struct ffs_dev *existing;
|
|
|
|
existing = _ffs_do_find_dev(name);
|
|
if (existing)
|
|
return -EBUSY;
|
|
|
|
dev->name = name;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The caller is responsible for "name" being available whenever f_fs needs it
|
|
*/
|
|
int ffs_name_dev(struct ffs_dev *dev, const char *name)
|
|
{
|
|
int ret;
|
|
|
|
ffs_dev_lock();
|
|
ret = _ffs_name_dev(dev, name);
|
|
ffs_dev_unlock();
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ffs_name_dev);
|
|
|
|
int ffs_single_dev(struct ffs_dev *dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = 0;
|
|
ffs_dev_lock();
|
|
|
|
if (!list_is_singular(&ffs_devices))
|
|
ret = -EBUSY;
|
|
else
|
|
dev->single = true;
|
|
|
|
ffs_dev_unlock();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ffs_single_dev);
|
|
|
|
/*
|
|
* ffs_lock must be taken by the caller of this function
|
|
*/
|
|
static void _ffs_free_dev(struct ffs_dev *dev)
|
|
{
|
|
list_del(&dev->entry);
|
|
if (dev->name_allocated)
|
|
kfree(dev->name);
|
|
kfree(dev);
|
|
if (list_empty(&ffs_devices))
|
|
functionfs_cleanup();
|
|
}
|
|
|
|
static void *ffs_acquire_dev(const char *dev_name)
|
|
{
|
|
struct ffs_dev *ffs_dev;
|
|
|
|
ENTER();
|
|
ffs_dev_lock();
|
|
|
|
ffs_dev = _ffs_find_dev(dev_name);
|
|
if (!ffs_dev)
|
|
ffs_dev = ERR_PTR(-ENODEV);
|
|
else if (ffs_dev->mounted)
|
|
ffs_dev = ERR_PTR(-EBUSY);
|
|
else if (ffs_dev->ffs_acquire_dev_callback &&
|
|
ffs_dev->ffs_acquire_dev_callback(ffs_dev))
|
|
ffs_dev = ERR_PTR(-ENODEV);
|
|
else
|
|
ffs_dev->mounted = true;
|
|
|
|
ffs_dev_unlock();
|
|
return ffs_dev;
|
|
}
|
|
|
|
static void ffs_release_dev(struct ffs_data *ffs_data)
|
|
{
|
|
struct ffs_dev *ffs_dev;
|
|
|
|
ENTER();
|
|
ffs_dev_lock();
|
|
|
|
ffs_dev = ffs_data->private_data;
|
|
if (ffs_dev) {
|
|
ffs_dev->mounted = false;
|
|
|
|
if (ffs_dev->ffs_release_dev_callback)
|
|
ffs_dev->ffs_release_dev_callback(ffs_dev);
|
|
}
|
|
|
|
ffs_dev_unlock();
|
|
}
|
|
|
|
static int ffs_ready(struct ffs_data *ffs)
|
|
{
|
|
struct ffs_dev *ffs_obj;
|
|
int ret = 0;
|
|
|
|
ENTER();
|
|
ffs_dev_lock();
|
|
|
|
ffs_obj = ffs->private_data;
|
|
if (!ffs_obj) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
if (WARN_ON(ffs_obj->desc_ready)) {
|
|
ret = -EBUSY;
|
|
goto done;
|
|
}
|
|
|
|
ffs_obj->desc_ready = true;
|
|
ffs_obj->ffs_data = ffs;
|
|
|
|
if (ffs_obj->ffs_ready_callback)
|
|
ret = ffs_obj->ffs_ready_callback(ffs);
|
|
|
|
done:
|
|
ffs_dev_unlock();
|
|
return ret;
|
|
}
|
|
|
|
static void ffs_closed(struct ffs_data *ffs)
|
|
{
|
|
struct ffs_dev *ffs_obj;
|
|
|
|
ENTER();
|
|
ffs_dev_lock();
|
|
|
|
ffs_obj = ffs->private_data;
|
|
if (!ffs_obj)
|
|
goto done;
|
|
|
|
ffs_obj->desc_ready = false;
|
|
|
|
if (ffs_obj->ffs_closed_callback)
|
|
ffs_obj->ffs_closed_callback(ffs);
|
|
|
|
if (!ffs_obj->opts || ffs_obj->opts->no_configfs
|
|
|| !ffs_obj->opts->func_inst.group.cg_item.ci_parent)
|
|
goto done;
|
|
|
|
unregister_gadget_item(ffs_obj->opts->
|
|
func_inst.group.cg_item.ci_parent->ci_parent);
|
|
done:
|
|
ffs_dev_unlock();
|
|
}
|
|
|
|
/* Misc helper functions ****************************************************/
|
|
|
|
static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock)
|
|
{
|
|
return nonblock
|
|
? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN
|
|
: mutex_lock_interruptible(mutex);
|
|
}
|
|
|
|
static char *ffs_prepare_buffer(const char __user *buf, size_t len)
|
|
{
|
|
char *data;
|
|
|
|
if (unlikely(!len))
|
|
return NULL;
|
|
|
|
data = kmalloc(len, GFP_KERNEL);
|
|
if (unlikely(!data))
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (unlikely(__copy_from_user(data, buf, len))) {
|
|
kfree(data);
|
|
return ERR_PTR(-EFAULT);
|
|
}
|
|
|
|
pr_vdebug("Buffer from user space:\n");
|
|
ffs_dump_mem("", data, len);
|
|
|
|
return data;
|
|
}
|
|
|
|
DECLARE_USB_FUNCTION_INIT(ffs, ffs_alloc_inst, ffs_alloc);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Michal Nazarewicz");
|