| /* |
| * f_fs.c -- user mode file system API for USB composite function controllers |
| * |
| * Copyright (C) 2010 Samsung Electronics |
| * Author: Michal Nazarewicz <mina86@mina86.com> |
| * |
| * Based on inode.c (GadgetFS) which was: |
| * Copyright (C) 2003-2004 David Brownell |
| * Copyright (C) 2003 Agilent Technologies |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| |
| /* #define DEBUG */ |
| /* #define VERBOSE_DEBUG */ |
| |
| #include <linux/blkdev.h> |
| #include <linux/pagemap.h> |
| #include <linux/export.h> |
| #include <asm/unaligned.h> |
| |
| #include <linux/usb/composite.h> |
| #include <linux/usb/functionfs.h> |
| |
| |
| #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ |
| |
| |
| /* Debugging ****************************************************************/ |
| |
| #ifdef VERBOSE_DEBUG |
| # define pr_vdebug pr_debug |
| # define ffs_dump_mem(prefix, ptr, len) \ |
| print_hex_dump_bytes(pr_fmt(prefix ": "), DUMP_PREFIX_NONE, ptr, len) |
| #else |
| # define pr_vdebug(...) do { } while (0) |
| # define ffs_dump_mem(prefix, ptr, len) do { } while (0) |
| #endif /* VERBOSE_DEBUG */ |
| |
| #define ENTER() pr_vdebug("%s()\n", __func__) |
| |
| |
| /* The data structure and setup file ****************************************/ |
| |
| enum ffs_state { |
| /* |
| * Waiting for descriptors and strings. |
| * |
| * In this state no open(2), read(2) or write(2) on epfiles |
| * may succeed (which should not be the problem as there |
| * should be no such files opened in the first place). |
| */ |
| FFS_READ_DESCRIPTORS, |
| FFS_READ_STRINGS, |
| |
| /* |
| * We've got descriptors and strings. We are or have called |
| * functionfs_ready_callback(). functionfs_bind() may have |
| * been called but we don't know. |
| * |
| * This is the only state in which operations on epfiles may |
| * succeed. |
| */ |
| FFS_ACTIVE, |
| |
| /* |
| * All endpoints have been closed. This state is also set if |
| * we encounter an unrecoverable error. The only |
| * unrecoverable error is situation when after reading strings |
| * from user space we fail to initialise epfiles or |
| * functionfs_ready_callback() returns with error (<0). |
| * |
| * In this state no open(2), read(2) or write(2) (both on ep0 |
| * as well as epfile) may succeed (at this point epfiles are |
| * unlinked and all closed so this is not a problem; ep0 is |
| * also closed but ep0 file exists and so open(2) on ep0 must |
| * fail). |
| */ |
| FFS_CLOSING |
| }; |
| |
| |
| enum ffs_setup_state { |
| /* There is no setup request pending. */ |
| FFS_NO_SETUP, |
| /* |
| * User has read events and there was a setup request event |
| * there. The next read/write on ep0 will handle the |
| * request. |
| */ |
| FFS_SETUP_PENDING, |
| /* |
| * There was event pending but before user space handled it |
| * some other event was introduced which canceled existing |
| * setup. If this state is set read/write on ep0 return |
| * -EIDRM. This state is only set when adding event. |
| */ |
| FFS_SETUP_CANCELED |
| }; |
| |
| |
| |
| struct ffs_epfile; |
| struct ffs_function; |
| |
| struct ffs_data { |
| struct usb_gadget *gadget; |
| |
| /* |
| * Protect access read/write operations, only one read/write |
| * at a time. As a consequence protects ep0req and company. |
| * While setup request is being processed (queued) this is |
| * held. |
| */ |
| struct mutex mutex; |
| |
| /* |
| * Protect access to endpoint related structures (basically |
| * usb_ep_queue(), usb_ep_dequeue(), etc. calls) except for |
| * endpoint zero. |
| */ |
| spinlock_t eps_lock; |
| |
| /* |
| * XXX REVISIT do we need our own request? Since we are not |
| * handling setup requests immediately user space may be so |
| * slow that another setup will be sent to the gadget but this |
| * time not to us but another function and then there could be |
| * a race. Is that the case? Or maybe we can use cdev->req |
| * after all, maybe we just need some spinlock for that? |
| */ |
| struct usb_request *ep0req; /* P: mutex */ |
| struct completion ep0req_completion; /* P: mutex */ |
| int ep0req_status; /* P: mutex */ |
| |
| /* reference counter */ |
| atomic_t ref; |
| /* how many files are opened (EP0 and others) */ |
| atomic_t opened; |
| |
| /* EP0 state */ |
| enum ffs_state state; |
| |
| /* |
| * Possible transitions: |
| * + FFS_NO_SETUP -> FFS_SETUP_PENDING -- P: ev.waitq.lock |
| * happens only in ep0 read which is P: mutex |
| * + FFS_SETUP_PENDING -> FFS_NO_SETUP -- P: ev.waitq.lock |
| * happens only in ep0 i/o which is P: mutex |
| * + FFS_SETUP_PENDING -> FFS_SETUP_CANCELED -- P: ev.waitq.lock |
| * + FFS_SETUP_CANCELED -> FFS_NO_SETUP -- cmpxchg |
| */ |
| enum ffs_setup_state setup_state; |
| |
| #define FFS_SETUP_STATE(ffs) \ |
| ((enum ffs_setup_state)cmpxchg(&(ffs)->setup_state, \ |
| FFS_SETUP_CANCELED, FFS_NO_SETUP)) |
| |
| /* Events & such. */ |
| struct { |
| u8 types[4]; |
| unsigned short count; |
| /* XXX REVISIT need to update it in some places, or do we? */ |
| unsigned short can_stall; |
| struct usb_ctrlrequest setup; |
| |
| wait_queue_head_t waitq; |
| } ev; /* the whole structure, P: ev.waitq.lock */ |
| |
| /* Flags */ |
| unsigned long flags; |
| #define FFS_FL_CALL_CLOSED_CALLBACK 0 |
| #define FFS_FL_BOUND 1 |
| |
| /* Active function */ |
| struct ffs_function *func; |
| |
| /* |
| * Device name, write once when file system is mounted. |
| * Intended for user to read if she wants. |
| */ |
| const char *dev_name; |
| /* Private data for our user (ie. gadget). Managed by user. */ |
| void *private_data; |
| |
| /* filled by __ffs_data_got_descs() */ |
| /* |
| * Real descriptors are 16 bytes after raw_descs (so you need |
| * to skip 16 bytes (ie. ffs->raw_descs + 16) to get to the |
| * first full speed descriptor). raw_descs_length and |
| * raw_fs_descs_length do not have those 16 bytes added. |
| */ |
| const void *raw_descs; |
| unsigned raw_descs_length; |
| unsigned raw_fs_descs_length; |
| unsigned fs_descs_count; |
| unsigned hs_descs_count; |
| |
| unsigned short strings_count; |
| unsigned short interfaces_count; |
| unsigned short eps_count; |
| unsigned short _pad1; |
| |
| /* filled by __ffs_data_got_strings() */ |
| /* ids in stringtabs are set in functionfs_bind() */ |
| const void *raw_strings; |
| struct usb_gadget_strings **stringtabs; |
| |
| /* |
| * File system's super block, write once when file system is |
| * mounted. |
| */ |
| struct super_block *sb; |
| |
| /* File permissions, written once when fs is mounted */ |
| struct ffs_file_perms { |
| umode_t mode; |
| uid_t uid; |
| gid_t gid; |
| } file_perms; |
| |
| /* |
| * The endpoint files, filled by ffs_epfiles_create(), |
| * destroyed by ffs_epfiles_destroy(). |
| */ |
| struct ffs_epfile *epfiles; |
| }; |
| |
| /* Reference counter handling */ |
| static void ffs_data_get(struct ffs_data *ffs); |
| static void ffs_data_put(struct ffs_data *ffs); |
| /* Creates new ffs_data object. */ |
| static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); |
| |
| /* Opened counter handling. */ |
| static void ffs_data_opened(struct ffs_data *ffs); |
| static void ffs_data_closed(struct ffs_data *ffs); |
| |
| /* Called with ffs->mutex held; take over ownership of data. */ |
| static int __must_check |
| __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); |
| static int __must_check |
| __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); |
| |
| |
| /* The function structure ***************************************************/ |
| |
| struct ffs_ep; |
| |
| struct ffs_function { |
| struct usb_configuration *conf; |
| struct usb_gadget *gadget; |
| struct ffs_data *ffs; |
| |
| struct ffs_ep *eps; |
| u8 eps_revmap[16]; |
| short *interfaces_nums; |
| |
| struct usb_function function; |
| }; |
| |
| |
| static struct ffs_function *ffs_func_from_usb(struct usb_function *f) |
| { |
| return container_of(f, struct ffs_function, function); |
| } |
| |
| static void ffs_func_free(struct ffs_function *func); |
| |
| static void ffs_func_eps_disable(struct ffs_function *func); |
| static int __must_check ffs_func_eps_enable(struct ffs_function *func); |
| |
| static int ffs_func_bind(struct usb_configuration *, |
| struct usb_function *); |
| static void ffs_func_unbind(struct usb_configuration *, |
| struct usb_function *); |
| static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); |
| static void ffs_func_disable(struct usb_function *); |
| static int ffs_func_setup(struct usb_function *, |
| const struct usb_ctrlrequest *); |
| static void ffs_func_suspend(struct usb_function *); |
| static void ffs_func_resume(struct usb_function *); |
| |
| |
| static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); |
| static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); |
| |
| |
| /* The endpoints structures *************************************************/ |
| |
| struct ffs_ep { |
| struct usb_ep *ep; /* P: ffs->eps_lock */ |
| struct usb_request *req; /* P: epfile->mutex */ |
| |
| /* [0]: full speed, [1]: high speed */ |
| struct usb_endpoint_descriptor *descs[2]; |
| |
| u8 num; |
| |
| int status; /* P: epfile->mutex */ |
| }; |
| |
| struct ffs_epfile { |
| /* Protects ep->ep and ep->req. */ |
| struct mutex mutex; |
| wait_queue_head_t wait; |
| |
| struct ffs_data *ffs; |
| struct ffs_ep *ep; /* P: ffs->eps_lock */ |
| |
| struct dentry *dentry; |
| |
| char name[5]; |
| |
| unsigned char in; /* P: ffs->eps_lock */ |
| unsigned char isoc; /* P: ffs->eps_lock */ |
| |
| unsigned char _pad; |
| }; |
| |
| static int __must_check ffs_epfiles_create(struct ffs_data *ffs); |
| static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); |
| |
| static struct inode *__must_check |
| ffs_sb_create_file(struct super_block *sb, const char *name, void *data, |
| const struct file_operations *fops, |
| struct dentry **dentry_p); |
| |
| |
| /* Misc helper functions ****************************************************/ |
| |
| static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) |
| __attribute__((warn_unused_result, nonnull)); |
| static char *ffs_prepare_buffer(const char * __user buf, size_t len) |
| __attribute__((warn_unused_result, nonnull)); |
| |
| |
| /* Control file aka ep0 *****************************************************/ |
| |
| static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) |
| { |
| struct ffs_data *ffs = req->context; |
| |
| complete_all(&ffs->ep0req_completion); |
| } |
| |
| static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) |
| { |
| struct usb_request *req = ffs->ep0req; |
| int ret; |
| |
| req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); |
| |
| spin_unlock_irq(&ffs->ev.waitq.lock); |
| |
| req->buf = data; |
| req->length = len; |
| |
| /* |
| * UDC layer requires to provide a buffer even for ZLP, but should |
| * not use it at all. Let's provide some poisoned pointer to catch |
| * possible bug in the driver. |
| */ |
| if (req->buf == NULL) |
| req->buf = (void *)0xDEADBABE; |
| |
| INIT_COMPLETION(ffs->ep0req_completion); |
| |
| ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| ret = wait_for_completion_interruptible(&ffs->ep0req_completion); |
| if (unlikely(ret)) { |
| usb_ep_dequeue(ffs->gadget->ep0, req); |
| return -EINTR; |
| } |
| |
| ffs->setup_state = FFS_NO_SETUP; |
| return ffs->ep0req_status; |
| } |
| |
| static int __ffs_ep0_stall(struct ffs_data *ffs) |
| { |
| if (ffs->ev.can_stall) { |
| pr_vdebug("ep0 stall\n"); |
| usb_ep_set_halt(ffs->gadget->ep0); |
| ffs->setup_state = FFS_NO_SETUP; |
| return -EL2HLT; |
| } else { |
| pr_debug("bogus ep0 stall!\n"); |
| return -ESRCH; |
| } |
| } |
| |
| static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, |
| size_t len, loff_t *ptr) |
| { |
| struct ffs_data *ffs = file->private_data; |
| ssize_t ret; |
| char *data; |
| |
| 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 */ |
| switch (ffs->state) { |
| case FFS_READ_DESCRIPTORS: |
| case FFS_READ_STRINGS: |
| /* Copy data */ |
| if (unlikely(len < 16)) { |
| ret = -EINVAL; |
| break; |
| } |
| |
| data = ffs_prepare_buffer(buf, len); |
| if (IS_ERR(data)) { |
| ret = PTR_ERR(data); |
| break; |
| } |
| |
| /* Handle data */ |
| if (ffs->state == FFS_READ_DESCRIPTORS) { |
| pr_info("read descriptors\n"); |
| ret = __ffs_data_got_descs(ffs, data, len); |
| if (unlikely(ret < 0)) |
| break; |
| |
| ffs->state = FFS_READ_STRINGS; |
| ret = len; |
| } else { |
| pr_info("read strings\n"); |
| ret = __ffs_data_got_strings(ffs, data, len); |
| if (unlikely(ret < 0)) |
| break; |
| |
| ret = ffs_epfiles_create(ffs); |
| if (unlikely(ret)) { |
| ffs->state = FFS_CLOSING; |
| break; |
| } |
| |
| ffs->state = FFS_ACTIVE; |
| mutex_unlock(&ffs->mutex); |
| |
| ret = functionfs_ready_callback(ffs); |
| if (unlikely(ret < 0)) { |
| ffs->state = FFS_CLOSING; |
| return ret; |
| } |
| |
| set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); |
| return len; |
| } |
| break; |
| |
| case FFS_ACTIVE: |
| data = NULL; |
| /* |
| * 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; |
| goto done_spin; |
| |
| case FFS_NO_SETUP: |
| ret = -ESRCH; |
| goto done_spin; |
| |
| case FFS_SETUP_PENDING: |
| break; |
| } |
| |
| /* FFS_SETUP_PENDING */ |
| if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { |
| spin_unlock_irq(&ffs->ev.waitq.lock); |
| ret = __ffs_ep0_stall(ffs); |
| break; |
| } |
| |
| /* FFS_SETUP_PENDING and not stall */ |
| len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); |
| |
| spin_unlock_irq(&ffs->ev.waitq.lock); |
| |
| data = ffs_prepare_buffer(buf, len); |
| if (IS_ERR(data)) { |
| ret = PTR_ERR(data); |
| break; |
| } |
| |
| spin_lock_irq(&ffs->ev.waitq.lock); |
| |
| /* |
| * We are guaranteed to be still in FFS_ACTIVE state |
| * but the state of setup could have changed from |
| * FFS_SETUP_PENDING to FFS_SETUP_CANCELED so we need |
| * to check for that. If that happened we copied data |
| * from user space in vain but it's unlikely. |
| * |
| * For sure we are not in FFS_NO_SETUP since this is |
| * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP |
| * transition can be performed and it's protected by |
| * mutex. |
| */ |
| if (FFS_SETUP_STATE(ffs) == FFS_SETUP_CANCELED) { |
| ret = -EIDRM; |
| done_spin: |
| spin_unlock_irq(&ffs->ev.waitq.lock); |
| } else { |
| /* 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 ffs_data *ffs; |
| |
| ENTER(); |
| |
| /* Initialise data */ |
| ffs = ffs_data_new(); |
| if (unlikely(!ffs)) |
| goto Enomem; |
| |
| 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); |
| sb->s_root = d_make_root(inode); |
| if (unlikely(!sb->s_root)) |
| goto Enomem; |
| |
| /* EP0 file */ |
| if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, |
| &ffs_ep0_operations, NULL))) |
| goto Enomem; |
| |
| return 0; |
| |
| Enomem: |
| 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) |
| { |
| ENTER(); |
| |
| kill_litter_super(sb); |
| if (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, |
| }; |
| |
| |
| /* 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); |
| } |
| } |
| |
| 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 = 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 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; |
| } |