mirror of https://gitee.com/openkylin/linux.git
2425 lines
54 KiB
C
2425 lines
54 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 <m.nazarewicz@samsung.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 <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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#define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */
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/* Debugging ****************************************************************/
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#ifdef VERBOSE_DEBUG
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# define pr_vdebug pr_debug
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# define ffs_dump_mem(prefix, ptr, len) \
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print_hex_dump_bytes(pr_fmt(prefix ": "), DUMP_PREFIX_NONE, ptr, len)
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#else
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# define pr_vdebug(...) do { } while (0)
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# define ffs_dump_mem(prefix, ptr, len) do { } while (0)
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#endif /* VERBOSE_DEBUG */
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#define ENTER() pr_vdebug("%s()\n", __func__)
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/* The data structure and setup file ****************************************/
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enum ffs_state {
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/*
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* Waiting for descriptors and strings.
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*
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* In this state no open(2), read(2) or write(2) on epfiles
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* may succeed (which should not be the problem as there
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* should be no such files opened in the first place).
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*/
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FFS_READ_DESCRIPTORS,
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FFS_READ_STRINGS,
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/*
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* We've got descriptors and strings. We are or have called
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* functionfs_ready_callback(). functionfs_bind() may have
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* been called but we don't know.
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*
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* This is the only state in which operations on epfiles may
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* succeed.
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*/
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FFS_ACTIVE,
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/*
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* All endpoints have been closed. This state is also set if
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* we encounter an unrecoverable error. The only
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* unrecoverable error is situation when after reading strings
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* from user space we fail to initialise epfiles or
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* functionfs_ready_callback() returns with error (<0).
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*
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* In this state no open(2), read(2) or write(2) (both on ep0
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* as well as epfile) may succeed (at this point epfiles are
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* unlinked and all closed so this is not a problem; ep0 is
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* also closed but ep0 file exists and so open(2) on ep0 must
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* fail).
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*/
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FFS_CLOSING
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};
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enum ffs_setup_state {
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/* There is no setup request pending. */
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FFS_NO_SETUP,
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/*
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* User has read events and there was a setup request event
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* there. The next read/write on ep0 will handle the
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* request.
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*/
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FFS_SETUP_PENDING,
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/*
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* There was event pending but before user space handled it
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* some other event was introduced which canceled existing
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* setup. If this state is set read/write on ep0 return
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* -EIDRM. This state is only set when adding event.
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*/
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FFS_SETUP_CANCELED
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};
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struct ffs_epfile;
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struct ffs_function;
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struct ffs_data {
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struct usb_gadget *gadget;
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/*
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* Protect access read/write operations, only one read/write
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* at a time. As a consequence protects ep0req and company.
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* While setup request is being processed (queued) this is
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* held.
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*/
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struct mutex mutex;
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/*
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* Protect access to endpoint related structures (basically
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* usb_ep_queue(), usb_ep_dequeue(), etc. calls) except for
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* endpoint zero.
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*/
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spinlock_t eps_lock;
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/*
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* XXX REVISIT do we need our own request? Since we are not
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* handling setup requests immediately user space may be so
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* slow that another setup will be sent to the gadget but this
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* time not to us but another function and then there could be
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* a race. Is that the case? Or maybe we can use cdev->req
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* after all, maybe we just need some spinlock for that?
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*/
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struct usb_request *ep0req; /* P: mutex */
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struct completion ep0req_completion; /* P: mutex */
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int ep0req_status; /* P: mutex */
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/* reference counter */
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atomic_t ref;
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/* how many files are opened (EP0 and others) */
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atomic_t opened;
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/* EP0 state */
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enum ffs_state state;
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/*
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* Possible transitions:
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* + FFS_NO_SETUP -> FFS_SETUP_PENDING -- P: ev.waitq.lock
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* happens only in ep0 read which is P: mutex
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* + FFS_SETUP_PENDING -> FFS_NO_SETUP -- P: ev.waitq.lock
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* happens only in ep0 i/o which is P: mutex
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* + FFS_SETUP_PENDING -> FFS_SETUP_CANCELED -- P: ev.waitq.lock
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* + FFS_SETUP_CANCELED -> FFS_NO_SETUP -- cmpxchg
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*/
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enum ffs_setup_state setup_state;
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#define FFS_SETUP_STATE(ffs) \
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((enum ffs_setup_state)cmpxchg(&(ffs)->setup_state, \
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FFS_SETUP_CANCELED, FFS_NO_SETUP))
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/* Events & such. */
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struct {
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u8 types[4];
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unsigned short count;
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/* XXX REVISIT need to update it in some places, or do we? */
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unsigned short can_stall;
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struct usb_ctrlrequest setup;
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wait_queue_head_t waitq;
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} ev; /* the whole structure, P: ev.waitq.lock */
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/* Flags */
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unsigned long flags;
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#define FFS_FL_CALL_CLOSED_CALLBACK 0
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#define FFS_FL_BOUND 1
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/* Active function */
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struct ffs_function *func;
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/*
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* Device name, write once when file system is mounted.
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* Intended for user to read if she wants.
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*/
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const char *dev_name;
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/* Private data for our user (ie. gadget). Managed by user. */
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void *private_data;
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/* filled by __ffs_data_got_descs() */
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/*
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* Real descriptors are 16 bytes after raw_descs (so you need
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* to skip 16 bytes (ie. ffs->raw_descs + 16) to get to the
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* first full speed descriptor). raw_descs_length and
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* raw_fs_descs_length do not have those 16 bytes added.
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*/
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const void *raw_descs;
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unsigned raw_descs_length;
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unsigned raw_fs_descs_length;
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unsigned fs_descs_count;
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unsigned hs_descs_count;
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unsigned short strings_count;
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unsigned short interfaces_count;
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unsigned short eps_count;
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unsigned short _pad1;
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/* filled by __ffs_data_got_strings() */
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/* ids in stringtabs are set in functionfs_bind() */
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const void *raw_strings;
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struct usb_gadget_strings **stringtabs;
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/*
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* File system's super block, write once when file system is
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* mounted.
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*/
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struct super_block *sb;
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/* File permissions, written once when fs is mounted */
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struct ffs_file_perms {
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umode_t mode;
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uid_t uid;
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gid_t gid;
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} file_perms;
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/*
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* The endpoint files, filled by ffs_epfiles_create(),
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* destroyed by ffs_epfiles_destroy().
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*/
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struct ffs_epfile *epfiles;
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};
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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 void ffs_func_free(struct ffs_function *func);
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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 void ffs_func_unbind(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 */
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struct usb_endpoint_descriptor *descs[2];
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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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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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/* 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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INIT_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 ffs->ep0req_status;
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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(ffs) == FFS_SETUP_CANCELED)
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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 = functionfs_ready_callback(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(ffs)) {
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case FFS_SETUP_CANCELED:
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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_CANCELED 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(ffs) == FFS_SETUP_CANCELED) {
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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 */
|
|
ret = __ffs_ep0_queue_wait(ffs, data, len);
|
|
}
|
|
kfree(data);
|
|
break;
|
|
|
|
default:
|
|
ret = -EBADFD;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&ffs->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf,
|
|
size_t n)
|
|
{
|
|
/*
|
|
* We are holding ffs->ev.waitq.lock and ffs->mutex and we need
|
|
* to release them.
|
|
*/
|
|
struct usb_functionfs_event events[n];
|
|
unsigned i = 0;
|
|
|
|
memset(events, 0, sizeof events);
|
|
|
|
do {
|
|
events[i].type = ffs->ev.types[i];
|
|
if (events[i].type == FUNCTIONFS_SETUP) {
|
|
events[i].u.setup = ffs->ev.setup;
|
|
ffs->setup_state = FFS_SETUP_PENDING;
|
|
}
|
|
} while (++i < n);
|
|
|
|
if (n < ffs->ev.count) {
|
|
ffs->ev.count -= n;
|
|
memmove(ffs->ev.types, ffs->ev.types + n,
|
|
ffs->ev.count * sizeof *ffs->ev.types);
|
|
} else {
|
|
ffs->ev.count = 0;
|
|
}
|
|
|
|
spin_unlock_irq(&ffs->ev.waitq.lock);
|
|
mutex_unlock(&ffs->mutex);
|
|
|
|
return unlikely(__copy_to_user(buf, events, sizeof events))
|
|
? -EFAULT : sizeof events;
|
|
}
|
|
|
|
static ssize_t ffs_ep0_read(struct file *file, char __user *buf,
|
|
size_t len, loff_t *ptr)
|
|
{
|
|
struct ffs_data *ffs = file->private_data;
|
|
char *data = NULL;
|
|
size_t n;
|
|
int ret;
|
|
|
|
ENTER();
|
|
|
|
/* Fast check if setup was canceled */
|
|
if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED)
|
|
return -EIDRM;
|
|
|
|
/* Acquire mutex */
|
|
ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
|
|
/* Check state */
|
|
if (ffs->state != FFS_ACTIVE) {
|
|
ret = -EBADFD;
|
|
goto done_mutex;
|
|
}
|
|
|
|
/*
|
|
* We're called from user space, we can use _irq rather then
|
|
* _irqsave
|
|
*/
|
|
spin_lock_irq(&ffs->ev.waitq.lock);
|
|
|
|
switch (FFS_SETUP_STATE(ffs)) {
|
|
case FFS_SETUP_CANCELED:
|
|
ret = -EIDRM;
|
|
break;
|
|
|
|
case FFS_NO_SETUP:
|
|
n = len / sizeof(struct usb_functionfs_event);
|
|
if (unlikely(!n)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) {
|
|
ret = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq,
|
|
ffs->ev.count)) {
|
|
ret = -EINTR;
|
|
break;
|
|
}
|
|
|
|
return __ffs_ep0_read_events(ffs, buf,
|
|
min(n, (size_t)ffs->ev.count));
|
|
|
|
case FFS_SETUP_PENDING:
|
|
if (ffs->ev.setup.bRequestType & USB_DIR_IN) {
|
|
spin_unlock_irq(&ffs->ev.waitq.lock);
|
|
ret = __ffs_ep0_stall(ffs);
|
|
goto done_mutex;
|
|
}
|
|
|
|
len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength));
|
|
|
|
spin_unlock_irq(&ffs->ev.waitq.lock);
|
|
|
|
if (likely(len)) {
|
|
data = kmalloc(len, GFP_KERNEL);
|
|
if (unlikely(!data)) {
|
|
ret = -ENOMEM;
|
|
goto done_mutex;
|
|
}
|
|
}
|
|
|
|
spin_lock_irq(&ffs->ev.waitq.lock);
|
|
|
|
/* See ffs_ep0_write() */
|
|
if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) {
|
|
ret = -EIDRM;
|
|
break;
|
|
}
|
|
|
|
/* unlocks spinlock */
|
|
ret = __ffs_ep0_queue_wait(ffs, data, len);
|
|
if (likely(ret > 0) && unlikely(__copy_to_user(buf, data, len)))
|
|
ret = -EFAULT;
|
|
goto done_mutex;
|
|
|
|
default:
|
|
ret = -EBADFD;
|
|
break;
|
|
}
|
|
|
|
spin_unlock_irq(&ffs->ev.waitq.lock);
|
|
done_mutex:
|
|
mutex_unlock(&ffs->mutex);
|
|
kfree(data);
|
|
return ret;
|
|
}
|
|
|
|
static int ffs_ep0_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct ffs_data *ffs = inode->i_private;
|
|
|
|
ENTER();
|
|
|
|
if (unlikely(ffs->state == FFS_CLOSING))
|
|
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->ops->ioctl) {
|
|
ret = gadget->ops->ioctl(gadget, code, value);
|
|
} else {
|
|
ret = -ENOTTY;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations ffs_ep0_operations = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
|
|
.open = ffs_ep0_open,
|
|
.write = ffs_ep0_write,
|
|
.read = ffs_ep0_read,
|
|
.release = ffs_ep0_release,
|
|
.unlocked_ioctl = ffs_ep0_ioctl,
|
|
};
|
|
|
|
|
|
/* "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 ssize_t ffs_epfile_io(struct file *file,
|
|
char __user *buf, size_t len, int read)
|
|
{
|
|
struct ffs_epfile *epfile = file->private_data;
|
|
struct ffs_ep *ep;
|
|
char *data = NULL;
|
|
ssize_t ret;
|
|
int halt;
|
|
|
|
goto first_try;
|
|
do {
|
|
spin_unlock_irq(&epfile->ffs->eps_lock);
|
|
mutex_unlock(&epfile->mutex);
|
|
|
|
first_try:
|
|
/* 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;
|
|
}
|
|
|
|
if (wait_event_interruptible(epfile->wait,
|
|
(ep = epfile->ep))) {
|
|
ret = -EINTR;
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Do we halt? */
|
|
halt = !read == !epfile->in;
|
|
if (halt && epfile->isoc) {
|
|
ret = -EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
/* Allocate & copy */
|
|
if (!halt && !data) {
|
|
data = kzalloc(len, GFP_KERNEL);
|
|
if (unlikely(!data))
|
|
return -ENOMEM;
|
|
|
|
if (!read &&
|
|
unlikely(__copy_from_user(data, buf, 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;
|
|
|
|
/*
|
|
* We're called from user space, we can use _irq rather then
|
|
* _irqsave
|
|
*/
|
|
spin_lock_irq(&epfile->ffs->eps_lock);
|
|
|
|
/*
|
|
* While we were acquiring mutex endpoint got disabled
|
|
* or changed?
|
|
*/
|
|
} while (unlikely(epfile->ep != ep));
|
|
|
|
/* Halt */
|
|
if (unlikely(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 */
|
|
DECLARE_COMPLETION_ONSTACK(done);
|
|
|
|
struct usb_request *req = ep->req;
|
|
req->context = &done;
|
|
req->complete = ffs_epfile_io_complete;
|
|
req->buf = data;
|
|
req->length = len;
|
|
|
|
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 {
|
|
ret = ep->status;
|
|
if (read && ret > 0 &&
|
|
unlikely(copy_to_user(buf, data, ret)))
|
|
ret = -EFAULT;
|
|
}
|
|
}
|
|
|
|
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)
|
|
{
|
|
ENTER();
|
|
|
|
return ffs_epfile_io(file, (char __user *)buf, len, 0);
|
|
}
|
|
|
|
static ssize_t
|
|
ffs_epfile_read(struct file *file, char __user *buf, size_t len, loff_t *ptr)
|
|
{
|
|
ENTER();
|
|
|
|
return ffs_epfile_io(file, buf, len, 1);
|
|
}
|
|
|
|
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_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 = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
|
|
.open = ffs_epfile_open,
|
|
.write = ffs_epfile_write,
|
|
.read = ffs_epfile_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;
|
|
};
|
|
|
|
static int ffs_sb_fill(struct super_block *sb, void *_data, int silent)
|
|
{
|
|
struct ffs_sb_fill_data *data = _data;
|
|
struct inode *inode;
|
|
struct dentry *d;
|
|
struct ffs_data *ffs;
|
|
|
|
ENTER();
|
|
|
|
/* Initialise data */
|
|
ffs = ffs_data_new();
|
|
if (unlikely(!ffs))
|
|
goto enomem0;
|
|
|
|
ffs->sb = sb;
|
|
ffs->dev_name = data->dev_name;
|
|
ffs->file_perms = data->perms;
|
|
|
|
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);
|
|
if (unlikely(!inode))
|
|
goto enomem1;
|
|
d = d_alloc_root(inode);
|
|
if (unlikely(!d))
|
|
goto enomem2;
|
|
sb->s_root = d;
|
|
|
|
/* EP0 file */
|
|
if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs,
|
|
&ffs_ep0_operations, NULL)))
|
|
goto enomem3;
|
|
|
|
return 0;
|
|
|
|
enomem3:
|
|
dput(d);
|
|
enomem2:
|
|
iput(inode);
|
|
enomem1:
|
|
ffs_data_put(ffs);
|
|
enomem0:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts)
|
|
{
|
|
ENTER();
|
|
|
|
if (!opts || !*opts)
|
|
return 0;
|
|
|
|
for (;;) {
|
|
char *end, *eq, *comma;
|
|
unsigned long value;
|
|
|
|
/* 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 */
|
|
value = simple_strtoul(eq + 1, &end, 0);
|
|
if (unlikely(*end != ',' && *end != 0)) {
|
|
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 = value;
|
|
else if (!memcmp(opts, "gid", 3))
|
|
data->perms.gid = value;
|
|
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 = 0,
|
|
.gid = 0
|
|
},
|
|
.root_mode = S_IFDIR | 0500,
|
|
};
|
|
int ret;
|
|
|
|
ENTER();
|
|
|
|
ret = functionfs_check_dev_callback(dev_name);
|
|
if (unlikely(ret < 0))
|
|
return ERR_PTR(ret);
|
|
|
|
ret = ffs_fs_parse_opts(&data, opts);
|
|
if (unlikely(ret < 0))
|
|
return ERR_PTR(ret);
|
|
|
|
data.dev_name = dev_name;
|
|
return mount_single(t, flags, &data, ffs_sb_fill);
|
|
}
|
|
|
|
static void
|
|
ffs_fs_kill_sb(struct super_block *sb)
|
|
{
|
|
void *ptr;
|
|
|
|
ENTER();
|
|
|
|
kill_litter_super(sb);
|
|
ptr = xchg(&sb->s_fs_info, NULL);
|
|
if (ptr)
|
|
ffs_data_put(ptr);
|
|
}
|
|
|
|
static struct file_system_type ffs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "functionfs",
|
|
.mount = ffs_fs_mount,
|
|
.kill_sb = ffs_fs_kill_sb,
|
|
};
|
|
|
|
|
|
/* 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(mutex_is_locked(&ffs->mutex) ||
|
|
spin_is_locked(&ffs->ev.waitq.lock) ||
|
|
waitqueue_active(&ffs->ev.waitq) ||
|
|
waitqueue_active(&ffs->ep0req_completion.wait));
|
|
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 0;
|
|
|
|
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))
|
|
functionfs_closed_callback(ffs);
|
|
|
|
BUG_ON(ffs->gadget);
|
|
|
|
if (ffs->epfiles)
|
|
ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count);
|
|
|
|
kfree(ffs->raw_descs);
|
|
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 = NULL;
|
|
ffs->raw_strings = NULL;
|
|
ffs->stringtabs = NULL;
|
|
|
|
ffs->raw_descs_length = 0;
|
|
ffs->raw_fs_descs_length = 0;
|
|
ffs->fs_descs_count = 0;
|
|
ffs->hs_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;
|
|
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 = kzalloc(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 int functionfs_bind_config(struct usb_composite_dev *cdev,
|
|
struct usb_configuration *c,
|
|
struct ffs_data *ffs)
|
|
{
|
|
struct ffs_function *func;
|
|
int ret;
|
|
|
|
ENTER();
|
|
|
|
func = kzalloc(sizeof *func, GFP_KERNEL);
|
|
if (unlikely(!func))
|
|
return -ENOMEM;
|
|
|
|
func->function.name = "Function FS Gadget";
|
|
func->function.strings = ffs->stringtabs;
|
|
|
|
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->conf = c;
|
|
func->gadget = cdev->gadget;
|
|
func->ffs = ffs;
|
|
ffs_data_get(ffs);
|
|
|
|
ret = usb_add_function(c, &func->function);
|
|
if (unlikely(ret))
|
|
ffs_func_free(func);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ffs_func_free(struct ffs_function *func)
|
|
{
|
|
ENTER();
|
|
|
|
ffs_data_put(func->ffs);
|
|
|
|
kfree(func->eps);
|
|
/*
|
|
* eps and interfaces_nums are allocated in the same chunk so
|
|
* only one free is required. Descriptors are also allocated
|
|
* in the same chunk.
|
|
*/
|
|
|
|
kfree(func);
|
|
}
|
|
|
|
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;
|
|
ds = ep->descs[ep->descs[1] ? 1 : 0];
|
|
|
|
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 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_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)
|
|
{
|
|
unsigned fs_count, hs_count;
|
|
int fs_len, ret = -EINVAL;
|
|
char *data = _data;
|
|
|
|
ENTER();
|
|
|
|
if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_DESCRIPTORS_MAGIC ||
|
|
get_unaligned_le32(data + 4) != len))
|
|
goto error;
|
|
fs_count = get_unaligned_le32(data + 8);
|
|
hs_count = get_unaligned_le32(data + 12);
|
|
|
|
if (!fs_count && !hs_count)
|
|
goto einval;
|
|
|
|
data += 16;
|
|
len -= 16;
|
|
|
|
if (likely(fs_count)) {
|
|
fs_len = ffs_do_descs(fs_count, data, len,
|
|
__ffs_data_do_entity, ffs);
|
|
if (unlikely(fs_len < 0)) {
|
|
ret = fs_len;
|
|
goto error;
|
|
}
|
|
|
|
data += fs_len;
|
|
len -= fs_len;
|
|
} else {
|
|
fs_len = 0;
|
|
}
|
|
|
|
if (likely(hs_count)) {
|
|
ret = ffs_do_descs(hs_count, data, len,
|
|
__ffs_data_do_entity, ffs);
|
|
if (unlikely(ret < 0))
|
|
goto error;
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
|
|
if (unlikely(len != ret))
|
|
goto einval;
|
|
|
|
ffs->raw_fs_descs_length = fs_len;
|
|
ffs->raw_descs_length = fs_len + ret;
|
|
ffs->raw_descs = _data;
|
|
ffs->fs_descs_count = fs_count;
|
|
ffs->hs_descs_count = hs_count;
|
|
|
|
return 0;
|
|
|
|
einval:
|
|
ret = -EINVAL;
|
|
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. */
|
|
{
|
|
struct {
|
|
struct usb_gadget_strings *stringtabs[lang_count + 1];
|
|
struct usb_gadget_strings stringtab[lang_count];
|
|
struct usb_string strings[lang_count*(needed_count+1)];
|
|
} *d;
|
|
unsigned i = 0;
|
|
|
|
d = kmalloc(sizeof *d, GFP_KERNEL);
|
|
if (unlikely(!d)) {
|
|
kfree(_data);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
stringtabs = d->stringtabs;
|
|
t = d->stringtab;
|
|
i = lang_count;
|
|
do {
|
|
*stringtabs++ = t++;
|
|
} while (--i);
|
|
*stringtabs = NULL;
|
|
|
|
stringtabs = d->stringtabs;
|
|
t = d->stringtab;
|
|
s = 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_CANCELED;
|
|
|
|
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;
|
|
|
|
/*
|
|
* If hs_descriptors is not NULL then we are reading hs
|
|
* descriptors now
|
|
*/
|
|
const int isHS = func->function.hs_descriptors != NULL;
|
|
unsigned idx;
|
|
|
|
if (type != FFS_DESCRIPTOR)
|
|
return 0;
|
|
|
|
if (isHS)
|
|
func->function.hs_descriptors[(long)valuep] = desc;
|
|
else
|
|
func->function.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[isHS])) {
|
|
pr_vdebug("two %sspeed descriptors for EP %d\n",
|
|
isHS ? "high" : "full",
|
|
ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
|
|
return -EINVAL;
|
|
}
|
|
ffs_ep->descs[isHS] = 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 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;
|
|
|
|
int ret;
|
|
|
|
/* Make it a single chunk, less management later on */
|
|
struct {
|
|
struct ffs_ep eps[ffs->eps_count];
|
|
struct usb_descriptor_header
|
|
*fs_descs[full ? ffs->fs_descs_count + 1 : 0];
|
|
struct usb_descriptor_header
|
|
*hs_descs[high ? ffs->hs_descs_count + 1 : 0];
|
|
short inums[ffs->interfaces_count];
|
|
char raw_descs[high ? ffs->raw_descs_length
|
|
: ffs->raw_fs_descs_length];
|
|
} *data;
|
|
|
|
ENTER();
|
|
|
|
/* Only high speed but not supported by gadget? */
|
|
if (unlikely(!(full | high)))
|
|
return -ENOTSUPP;
|
|
|
|
/* Allocate */
|
|
data = kmalloc(sizeof *data, GFP_KERNEL);
|
|
if (unlikely(!data))
|
|
return -ENOMEM;
|
|
|
|
/* Zero */
|
|
memset(data->eps, 0, sizeof data->eps);
|
|
memcpy(data->raw_descs, ffs->raw_descs + 16, sizeof data->raw_descs);
|
|
memset(data->inums, 0xff, sizeof data->inums);
|
|
for (ret = ffs->eps_count; ret; --ret)
|
|
data->eps[ret].num = -1;
|
|
|
|
/* Save pointers */
|
|
func->eps = data->eps;
|
|
func->interfaces_nums = data->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.descriptors = data->fs_descs;
|
|
ret = ffs_do_descs(ffs->fs_descs_count,
|
|
data->raw_descs,
|
|
sizeof data->raw_descs,
|
|
__ffs_func_bind_do_descs, func);
|
|
if (unlikely(ret < 0))
|
|
goto error;
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
|
|
if (likely(high)) {
|
|
func->function.hs_descriptors = data->hs_descs;
|
|
ret = ffs_do_descs(ffs->hs_descs_count,
|
|
data->raw_descs + ret,
|
|
(sizeof data->raw_descs) - ret,
|
|
__ffs_func_bind_do_descs, func);
|
|
}
|
|
|
|
/*
|
|
* 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),
|
|
data->raw_descs, sizeof data->raw_descs,
|
|
__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;
|
|
}
|
|
|
|
|
|
/* Other USB function hooks *************************************************/
|
|
|
|
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;
|
|
|
|
ENTER();
|
|
|
|
if (ffs->func == func) {
|
|
ffs_func_eps_disable(func);
|
|
ffs->func = NULL;
|
|
}
|
|
|
|
ffs_event_add(ffs, FUNCTIONFS_UNBIND);
|
|
|
|
ffs_func_free(func);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
/* 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;
|
|
}
|