From 613693e01326d7410ee952a6ece621835952608d Mon Sep 17 00:00:00 2001 From: hwyml Date: Tue, 11 Feb 2025 17:10:21 +0800 Subject: [PATCH] softlink f_generic.c Signed-off-by: hwyml Change-Id: I9838d0e8d78544455b9d6978140e241e996a8160 --- drivers/usb/gadget/function/f_generic.c | 3790 +---------------------- 1 file changed, 1 insertion(+), 3789 deletions(-) mode change 100644 => 120000 drivers/usb/gadget/function/f_generic.c diff --git a/drivers/usb/gadget/function/f_generic.c b/drivers/usb/gadget/function/f_generic.c deleted file mode 100644 index 34596696b094..000000000000 --- a/drivers/usb/gadget/function/f_generic.c +++ /dev/null @@ -1,3789 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * f_fs.c -- user mode file system API for USB composite function controllers - * - * Copyright (C) 2010 Samsung Electronics - * Author: Michal Nazarewicz - * - * Based on inode.c (GadgetFS) which was: - * Copyright (C) 2003-2004 David Brownell - * Copyright (C) 2003 Agilent Technologies - */ - -/* #define DEBUG */ -/* #define VERBOSE_DEBUG */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include "u_generic.h" -#include "u_f.h" -#include "u_os_desc.h" -#include "configfs.h" - -#define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ - -/* 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(const char *dev_name) - __attribute__((malloc)); - -/* 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 inline enum ffs_setup_state ffs_setup_state_clear_cancelled(struct ffs_data *ffs) -{ - return (enum ffs_setup_state) - cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP); -} -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 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 bool ffs_func_req_match(struct usb_function *, - const struct usb_ctrlrequest *, - bool config0); -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, [2]: super speed */ - struct usb_endpoint_descriptor *descs[3]; - - u8 num; - - int status; /* P: epfile->mutex */ -}; - -struct ffs_epfile { - /* Protects ep->ep and ep->req. */ - struct mutex mutex; - struct list_head memory_list; - struct ffs_data *ffs; - struct ffs_ep *ep; /* P: ffs->eps_lock */ - /* - * Buffer for holding data from partial reads which may happen since - * we’re rounding user read requests to a multiple of a max packet size. - * - * The pointer is initialised with NULL value and may be set by - * __ffs_epfile_read_data function to point to a temporary buffer. - * - * In normal operation, calls to __ffs_epfile_read_buffered will consume - * data from said buffer and eventually free it. Importantly, while the - * function is using the buffer, it sets the pointer to NULL. This is - * all right since __ffs_epfile_read_data and __ffs_epfile_read_buffered - * can never run concurrently (they are synchronised by epfile->mutex) - * so the latter will not assign a new value to the pointer. - * - * Meanwhile ffs_func_eps_disable frees the buffer (if the pointer is - * valid) and sets the pointer to READ_BUFFER_DROP value. This special - * value is crux of the synchronisation between ffs_func_eps_disable and - * __ffs_epfile_read_data. - * - * Once __ffs_epfile_read_data is about to finish it will try to set the - * pointer back to its old value (as described above), but seeing as the - * pointer is not-NULL (namely READ_BUFFER_DROP) it will instead free - * the buffer. - * - * == State transitions == - * - * • ptr == NULL: (initial state) - * ◦ __ffs_epfile_read_buffer_free: go to ptr == DROP - * ◦ __ffs_epfile_read_buffered: nop - * ◦ __ffs_epfile_read_data allocates temp buffer: go to ptr == buf - * ◦ reading finishes: n/a, not in ‘and reading’ state - * • ptr == DROP: - * ◦ __ffs_epfile_read_buffer_free: nop - * ◦ __ffs_epfile_read_buffered: go to ptr == NULL - * ◦ __ffs_epfile_read_data allocates temp buffer: free buf, nop - * ◦ reading finishes: n/a, not in ‘and reading’ state - * • ptr == buf: - * ◦ __ffs_epfile_read_buffer_free: free buf, go to ptr == DROP - * ◦ __ffs_epfile_read_buffered: go to ptr == NULL and reading - * ◦ __ffs_epfile_read_data: n/a, __ffs_epfile_read_buffered - * is always called first - * ◦ reading finishes: n/a, not in ‘and reading’ state - * • ptr == NULL and reading: - * ◦ __ffs_epfile_read_buffer_free: go to ptr == DROP and reading - * ◦ __ffs_epfile_read_buffered: n/a, mutex is held - * ◦ __ffs_epfile_read_data: n/a, mutex is held - * ◦ reading finishes and … - * … all data read: free buf, go to ptr == NULL - * … otherwise: go to ptr == buf and reading - * • ptr == DROP and reading: - * ◦ __ffs_epfile_read_buffer_free: nop - * ◦ __ffs_epfile_read_buffered: n/a, mutex is held - * ◦ __ffs_epfile_read_data: n/a, mutex is held - * ◦ reading finishes: free buf, go to ptr == DROP - */ - struct ffs_buffer *read_buffer; -#define READ_BUFFER_DROP ((struct ffs_buffer *)ERR_PTR(-ESHUTDOWN)) - - char name[MAX_NAMELEN]; - dev_t devno; - struct cdev cdev; - struct device *device; - - unsigned char in; /* P: ffs->eps_lock */ - unsigned char isoc; /* P: ffs->eps_lock */ - - struct kfifo reqEventFifo; - wait_queue_head_t wait_que; - - unsigned char _pad; -}; - -struct ffs_buffer { - size_t length; - char *data; - char storage[]; -}; - -/* ffs_io_data structure ***************************************************/ - -struct ffs_io_data { - uint32_t aio; - uint32_t read; - uint32_t len; - uint32_t timeout; - uint64_t buf; - uint32_t actual; - int status; - struct tasklet_struct task; - struct usb_ep *ep; - struct usb_request *req; - struct ffs_epfile *epfile; - struct ffs_data *ffs; -}; - -struct ffs_desc_helper { - struct ffs_data *ffs; - unsigned interfaces_count; - unsigned eps_count; -}; - -static int __must_check ffs_epfiles_create(struct ffs_data *ffs); -static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); - -/* Devices management *******************************************************/ - -DEFINE_MUTEX(ffs_lock_adapter); -EXPORT_SYMBOL_GPL(ffs_lock_adapter); - -static struct ffs_dev *_ffs_find_dev(const char *name); -static struct ffs_dev *_ffs_alloc_dev(void); -static void _ffs_free_dev(struct ffs_dev *dev); -static void *ffs_acquire_dev(const char *dev_name); -static void ffs_release_dev(struct ffs_data *ffs_data); -static int ffs_ready(struct ffs_data *ffs); -static void ffs_closed(struct ffs_data *ffs); - -/* 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)); - -struct class *ffs_class; - -static char *ffs_devnode(const struct device *dev, umode_t *mode) -{ - if (mode) - *mode = 0666; - return kasprintf(GFP_KERNEL, "functionfs/%s", dev_name(dev)); -} - -/* Control file aka ep0 *****************************************************/ -static struct ffs_memory *generic_find_ep0_memory_area(struct ffs_data *ffs, uint64_t buf, uint32_t len) -{ - struct ffs_memory *ffsm = NULL; - struct ffs_memory *iter = NULL; - uint64_t buf_start = buf; - unsigned long flags; - - spin_lock_irqsave(&ffs->mem_lock, flags); - list_for_each_entry(iter, &ffs->memory_list, memlist) { - if (buf_start >= iter->vm_start && - buf_start < iter->vm_start + iter->size) { - if (len <= iter->vm_start + iter->size - buf_start) { - ffsm = iter; - break; - } - } - } - spin_unlock_irqrestore(&ffs->mem_lock, flags); - return ffsm; -} - -static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) -{ - struct ffs_data *ffs = req->context; - - complete(&ffs->ep0req_completion); - - ffs->setup_state = FFS_NO_SETUP; -} - -static void ffs_ep0_async_io_complete(struct usb_ep *_ep, struct usb_request *req) -{ - struct ffs_io_data *io_data = req->context; - struct ffs_data *ffs = io_data->ffs; - ENTER(); - - io_data->status = io_data->req->status; - io_data->actual = io_data->req->actual; - kfifo_in(&ffs->reqEventFifo, &io_data->buf, sizeof(struct UsbFnReqEvent)); - wake_up_all(&ffs->wait_que); - - list_del(&req->list); - usb_ep_free_request(io_data->ep, io_data->req); - kfree(io_data); - -} - -static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) - __releases(&ffs->ev.waitq.lock) -{ - 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; - - reinit_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 req->status ? req->status : req->actual; -} - -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 = NULL; - - ENTER(); - - /* Fast check if setup was canceled */ - if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) - 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 = ffs_ready(ffs); - if (unlikely(ret < 0)) { - ffs->state = FFS_CLOSING; - return ret; - } - - 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_clear_cancelled(ffs)) { - case FFS_SETUP_CANCELLED: - 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_CANCELLED 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_clear_cancelled(ffs) == - FFS_SETUP_CANCELLED) { - 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; -} - -/* Called with ffs->ev.waitq.lock and ffs->mutex held, both released on exit. */ -static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, size_t n) - __releases(&ffs->ev.waitq.lock) -{ - /* - * n cannot be bigger than ffs->ev.count, which cannot be bigger than - * size of ffs->ev.types array (which is four) so that's how much space - * we reserve. - */ - struct usb_functionfs_event events[ARRAY_SIZE(ffs->ev.types)]; - const size_t size = n * sizeof *events; - unsigned i = 0; - - memset(events, 0, size); - - 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); - - ffs->ev.count -= n; - if (ffs->ev.count) - memmove(ffs->ev.types, ffs->ev.types + n, ffs->ev.count * sizeof *ffs->ev.types); - - spin_unlock_irq(&ffs->ev.waitq.lock); - mutex_unlock(&ffs->mutex); - - return unlikely(copy_to_user(buf, events, size)) ? -EFAULT : size; -} - -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_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) - 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_clear_cancelled(ffs)) { - case FFS_SETUP_CANCELLED: - 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; - } - - /* unlocks spinlock */ - 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_clear_cancelled(ffs) == - FFS_SETUP_CANCELLED) { - 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 = container_of(inode->i_cdev, struct ffs_data, cdev); - ENTER(); - - if (unlikely(ffs->state == FFS_CLOSING)) - return -EBUSY; - - file->private_data = ffs; - return 0; -} - -static int ffs_ep0_release(struct inode *inode, struct file *file) -{ - ENTER(); - return 0; -} - -static ssize_t ffs_ep0_iorw(struct file *file, struct ffs_io_data *io_data) -{ - struct ffs_data *ffs = file->private_data; - struct usb_request *req = NULL; - ssize_t ret, data_len = io_data->len; - bool interrupted = false; - struct ffs_memory *ffsm = NULL; - - /* Are we still active? */ - if (WARN_ON(ffs->state != FFS_ACTIVE)) - return -ENODEV; - ffsm = generic_find_ep0_memory_area(ffs, io_data->buf, data_len); - if (ffsm == NULL) - { - return -ENODEV; - } - if (!io_data->aio) { - reinit_completion(&ffs->ep0req_completion); - - req = ffs->ep0req; - req->buf = (void *)(ffsm->mem + io_data->buf - ffsm->vm_start); - req->length = data_len; - req->complete = ffs_ep0_complete; - - ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); - if (unlikely(ret < 0)) - goto error; - - if (io_data->timeout > 0) { - ret = wait_for_completion_interruptible_timeout(&ffs->ep0req_completion, io_data->timeout); - if (ret < 0) { - /* - * To avoid race condition with ffs_epfile_io_complete, - * dequeue the request first then check - * status. usb_ep_dequeue API should guarantee no race - * condition with req->complete callback. - */ - usb_ep_dequeue(ffs->gadget->ep0, req); - wait_for_completion(&ffs->ep0req_completion); - interrupted = req->status < 0; - } else if (ret == 0) { - ret = -EBUSY; - usb_ep_dequeue(ffs->gadget->ep0, req); - wait_for_completion(&ffs->ep0req_completion); - goto error; - } - } else { - ret = wait_for_completion_interruptible(&ffs->ep0req_completion); - if (ret < 0) { - usb_ep_dequeue(ffs->gadget->ep0, req); - wait_for_completion(&ffs->ep0req_completion); - interrupted = req->status < 0; - } - } - - if (interrupted) { - ret = -EINTR; - } else { - ret = req->actual; - } - goto error; - } - else if (!(req = usb_ep_alloc_request(ffs->gadget->ep0, GFP_ATOMIC))) { - ret = -ENOMEM; - } - else { - req->buf = (void *)(ffsm->mem + io_data->buf - ffsm->vm_start); - req->length = data_len; - - io_data->ep = ffs->gadget->ep0; - io_data->req = req; - io_data->ffs = ffs; - - req->context = io_data; - req->complete = ffs_ep0_async_io_complete; - list_add(&req->list, &ffs->ep0req->list); - ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); - if (unlikely(ret)) { - usb_ep_free_request(ffs->gadget->ep0, req); - goto error; - } - - ret = -EIOCBQUEUED; - } - -error: - return ret; -} - -static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) -{ - struct ffs_data *ffs = file->private_data; - long ret = 0; - unsigned int copied = 0; - struct ffs_memory *ffsm = NULL; - struct generic_memory mem; - - ENTER(); - - switch (code) { - case FUNCTIONFS_ENDPOINT_QUEUE_INIT: - ret = kfifo_alloc(&ffs->reqEventFifo, MAX_REQUEST * sizeof(struct UsbFnReqEvent), GFP_KERNEL); - break; - case FUNCTIONFS_ENDPOINT_QUEUE_DEL: - kfifo_free(&ffs->reqEventFifo); - break; - case FUNCTIONFS_ENDPOINT_RELEASE_BUF: - if (copy_from_user(&mem, (void __user *)value, sizeof(mem))) - { - pr_info("copy from user failed\n"); - return -EFAULT; - } - ffsm = generic_find_ep0_memory_area(ffs, mem.buf, mem.size); - if (ffsm == NULL) - { - return -EFAULT; - } - list_del(&ffsm->memlist); - kfree((void *)ffsm->mem); - kfree(ffsm); - break; - case FUNCTIONFS_ENDPOINT_READ: - case FUNCTIONFS_ENDPOINT_WRITE: - { - struct IoData myIoData; - struct ffs_io_data io_data, *p = &io_data; - ret = copy_from_user(&myIoData, (void __user *)value, sizeof(struct IoData)); - if (unlikely(ret)) { - return -EFAULT; - } - if (myIoData.aio) { - p = kmalloc(sizeof(io_data), GFP_KERNEL); - if (unlikely(!p)) - return -ENOMEM; - } else { - memset(p, 0, sizeof(*p)); - } - memcpy(p, &myIoData, sizeof(struct IoData)); - - ret = ffs_ep0_iorw(file, p); - if (ret == -EIOCBQUEUED) { - return 0; - } - if (p->aio) - kfree(p); - return ret; - } - case FUNCTIONFS_ENDPOINT_RW_CANCEL: - { - struct usb_request *req; - struct IoData myIoData; - ret = copy_from_user(&myIoData, (void __user *)value, sizeof(struct IoData)); - if (unlikely(ret)) { - return -EFAULT; - } - ffsm = generic_find_ep0_memory_area(ffs, myIoData.buf, myIoData.len); - if (ffsm == NULL) - { - return -EFAULT; - } - list_for_each_entry(req, &ffs->ep0req->list, list) { - if (req->buf == (void *)(ffsm->mem + myIoData.buf - ffsm->vm_start)) { - usb_ep_dequeue(ffs->gadget->ep0, req); - return 0; - } - } - return -EFAULT; - } - case FUNCTIONFS_ENDPOINT_GET_REQ_STATUS: - { - struct usb_request *req; - struct IoData myIoData; - ret = copy_from_user(&myIoData, (void __user *)value, sizeof(struct IoData)); - if (unlikely(ret)) { - return -EFAULT; - } - ffsm = generic_find_ep0_memory_area(ffs, myIoData.buf, myIoData.len); - if (ffsm == NULL) - { - return -EFAULT; - } - list_for_each_entry(req, &ffs->ep0req->list, list) { - if (req->buf == (void *)(ffsm->mem + myIoData.buf - ffsm->vm_start)) { - return req->status; - } - } - return -EFAULT; - } - case FUNCTIONFS_ENDPOINT_GET_EP0_EVENT: - if (!kfifo_is_empty(&ffs->reqEventFifo)) { - ret = kfifo_to_user(&ffs->reqEventFifo, (void __user *)value, - sizeof(struct UsbFnReqEvent), &copied) == 0 ? copied : -1; - if (ret > 0) { - ffs->setup_state = FFS_NO_SETUP; - return ret; - } - } - - return -EFAULT; - } - - return ret; -} - -#ifdef CONFIG_COMPAT -static long ffs_ep0_compat_ioctl(struct file *file, unsigned code, - unsigned long value) -{ - return ffs_ep0_ioctl(file, code, value); -} -#endif - -static __poll_t ffs_ep0_poll(struct file *file, poll_table *wait) -{ - struct ffs_data *ffs = file->private_data; - __poll_t mask = EPOLLWRNORM; - int ret; - - ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); - if (unlikely(ret < 0)) - return mask; - - switch (ffs->state) { - case FFS_READ_DESCRIPTORS: - case FFS_READ_STRINGS: - mask |= EPOLLOUT; - break; - - case FFS_ACTIVE: - switch (ffs->setup_state) { - case FFS_NO_SETUP: - poll_wait(file, &ffs->ev.waitq, wait); - if (ffs->ev.count) - mask |= EPOLLIN; - break; - - case FFS_SETUP_PENDING: - case FFS_SETUP_CANCELLED: - poll_wait(file, &ffs->wait_que, wait); - if (!kfifo_is_empty(&ffs->reqEventFifo)) - { - mask |= EPOLLOUT; - } - break; - } - case FFS_CLOSING: - break; - case FFS_DEACTIVATED: - break; - } - - mutex_unlock(&ffs->mutex); - - return mask; -} - -static int ffs_ep0_mmap(struct file *file, struct vm_area_struct *vma) -{ - struct ffs_data *ffs = file->private_data; - size_t size = vma->vm_end - vma->vm_start; - unsigned long flags; - struct ffs_memory *ffsm = NULL; - void *virt_mem = NULL; - - if (ffs == NULL) { - pr_info("Invalid private parameter!\n"); - return -EINVAL; - } - virt_mem = kmalloc(size, GFP_KERNEL); - if (virt_mem == NULL) - { - pr_info("%s alloc memory failed!\n", __FUNCTION__); - return -ENOMEM; - } - ffsm = kmalloc(sizeof(struct ffs_memory), GFP_KERNEL); - if (ffsm == NULL) - { - pr_info("%s alloc memory failed!\n", __FUNCTION__); - goto error_free_mem; - } - if (remap_pfn_range(vma, vma->vm_start, virt_to_phys(virt_mem)>>PAGE_SHIFT, - vma->vm_end - vma->vm_start, vma->vm_page_prot)) { - goto error_free_ffsm; - } - ffsm->mem = (uint64_t)virt_mem; - ffsm->size = size; - ffsm->vm_start = vma->vm_start; - INIT_LIST_HEAD(&ffsm->memlist); - spin_lock_irqsave(&ffs->mem_lock, flags); - list_add_tail(&ffsm->memlist, &ffs->memory_list); - spin_unlock_irqrestore(&ffs->mem_lock, flags); - return 0; -error_free_ffsm: - kfree(ffsm); -error_free_mem: - kfree(virt_mem); - return -1; -} - -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, -#ifdef CONFIG_COMPAT - .compat_ioctl = ffs_ep0_compat_ioctl, -#endif - .poll = ffs_ep0_poll, - .mmap = ffs_ep0_mmap, -}; - -/* "Normal" endpoints operations ********************************************/ -static struct ffs_memory *generic_find_memory_area(struct ffs_epfile *epfile, uint64_t buf, uint32_t len) -{ - struct ffs_memory *ffsm = NULL, *iter = NULL; - uint64_t buf_start = buf; - - list_for_each_entry(iter, &epfile->memory_list, memlist) { - if (buf_start >= iter->vm_start && - buf_start < iter->vm_start + iter->size) { - if (len <= iter->vm_start + iter->size - buf_start) { - ffsm = iter; - break; - } - } - } - return ffsm; -} - -static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) -{ - ENTER(); - if (likely(req->context)) { - struct ffs_ep *ep = _ep->driver_data; - ep->status = req->status ? req->status : req->actual; - complete(req->context); - } -} - -static void epfile_task_proc(unsigned long context) -{ - struct ffs_io_data *io_data = (struct ffs_io_data *)context; - struct ffs_epfile *epfile = io_data->epfile; - unsigned long flags; - - spin_lock_irqsave(&epfile->ffs->eps_lock, flags); - io_data->status = io_data->req->status; - io_data->actual = io_data->req->actual; - kfifo_in(&epfile->reqEventFifo, &io_data->buf, sizeof(struct UsbFnReqEvent)); - list_del(&io_data->req->list); - usb_ep_free_request(io_data->ep, io_data->req); - kfree(io_data); - spin_unlock_irqrestore(&epfile->ffs->eps_lock, flags); - wake_up_all(&epfile->wait_que); -} - -static void ffs_epfile_async_io_complete(struct usb_ep *_ep, struct usb_request *req) -{ - struct ffs_io_data *io_data = req->context; - - tasklet_init(&io_data->task, epfile_task_proc, (uintptr_t)io_data); - tasklet_schedule(&io_data->task); - -} - -static int ffs_epfile_open(struct inode *inode, struct file *file) -{ - struct ffs_epfile *epfile = container_of(inode->i_cdev, struct ffs_epfile, cdev); - ENTER(); - if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) - return -ENODEV; - - file->private_data = epfile; - return 0; -} - -static int ffs_epfile_release(struct inode *inode, struct file *file) -{ - ENTER(); - return 0; -} - -static int ffs_epfile_mmap(struct file *file, struct vm_area_struct *vma) -{ - struct ffs_epfile *epfile = file->private_data; - size_t size = vma->vm_end - vma->vm_start; - struct ffs_memory *ffsm = NULL; - unsigned long flags; - void *virt_mem = NULL; - - if (epfile == NULL) - { - pr_info("Invalid private parameter!\n"); - return -EINVAL; - } - virt_mem = kmalloc(size, GFP_KERNEL); - if (virt_mem == NULL) - { - pr_info("%s alloc memory failed!\n", __FUNCTION__); - return -ENOMEM; - } - ffsm = kmalloc(sizeof(struct ffs_memory), GFP_KERNEL); - if (ffsm == NULL) - { - pr_info("%s alloc memory failed!\n", __FUNCTION__); - goto error_free_mem; - } - if (remap_pfn_range(vma, vma->vm_start, virt_to_phys(virt_mem)>>PAGE_SHIFT, - vma->vm_end - vma->vm_start, vma->vm_page_prot)) - { - goto error_free_ffsm; - } - ffsm->mem = (uint64_t)virt_mem; - ffsm->size = size; - ffsm->vm_start = vma->vm_start; - INIT_LIST_HEAD(&ffsm->memlist); - spin_lock_irqsave(&epfile->ffs->eps_lock, flags); - list_add_tail(&ffsm->memlist, &epfile->memory_list); - spin_unlock_irqrestore(&epfile->ffs->eps_lock, flags); - - return 0; -error_free_ffsm: - kfree(ffsm); -error_free_mem: - kfree(virt_mem); - - return -1; -} - -static ssize_t ffs_epfile_iorw(struct file *file, struct ffs_io_data *io_data) -{ - struct ffs_epfile *epfile = file->private_data; - struct usb_request *req = NULL; - struct ffs_ep *ep = NULL; - struct ffs_memory *ffsm = NULL; - ssize_t ret, data_len = -EINVAL; - int halt; - - /* Are we still active? */ - if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) - return -ENODEV; - - /* Wait for endpoint to be enabled */ - ep = epfile->ep; - if (!ep) { - if (file->f_flags & O_NONBLOCK) - return -EAGAIN; - - ret = wait_event_interruptible( - epfile->ffs->wait, (ep = epfile->ep)); - if (ret) - return -EINTR; - } - - /* Do we halt? */ - halt = (!io_data->read == !epfile->in); - if (halt && epfile->isoc) - return -EINVAL; - - /* We will be using request and read_buffer */ - ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK); - if (unlikely(ret)) - goto error; - - /* Allocate & copy */ - if (!halt) { - struct usb_gadget *gadget; - /* - * if we _do_ wait above, the epfile->ffs->gadget might be NULL - * before the waiting completes, so do not assign to 'gadget' - * earlier - */ - gadget = epfile->ffs->gadget; - - spin_lock_irq(&epfile->ffs->eps_lock); - /* In the meantime, endpoint got disabled or changed. */ - if (epfile->ep != ep) { - ret = -ESHUTDOWN; - goto error_lock; - } - data_len = io_data->len; - /* - * Controller may require buffer size to be aligned to - * maxpacketsize of an out endpoint. - */ - if (io_data->read) - data_len = usb_ep_align_maybe(gadget, ep->ep, data_len); - spin_unlock_irq(&epfile->ffs->eps_lock); - } - - spin_lock_irq(&epfile->ffs->eps_lock); - ffsm = generic_find_memory_area(epfile, io_data->buf, io_data->len); - if (ffsm == NULL) - { - return -EFAULT; - } - if (epfile->ep != ep) { - /* In the meantime, endpoint got disabled or changed. */ - ret = -ESHUTDOWN; - } - else if (halt) { - ret = usb_ep_set_halt(ep->ep); - if (!ret) - ret = -EBADMSG; - } - else if (!io_data->aio) { - DECLARE_COMPLETION_ONSTACK(done); - bool interrupted = false; - - req = ep->req; - req->buf = (void *)(ffsm->mem + io_data->buf - ffsm->vm_start); - req->length = data_len; - - req->context = &done; - req->complete = ffs_epfile_io_complete; - - ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); - if (unlikely(ret < 0)) - goto error_lock; - - spin_unlock_irq(&epfile->ffs->eps_lock); - if (io_data->timeout > 0) { - ret = wait_for_completion_interruptible_timeout(&done, io_data->timeout); - if (ret < 0) { - /* - * To avoid race condition with ffs_epfile_io_complete, - * dequeue the request first then check - * status. usb_ep_dequeue API should guarantee no race - * condition with req->complete callback. - */ - usb_ep_dequeue(ep->ep, req); - wait_for_completion(&done); - interrupted = ep->status < 0; - } else if (ret == 0) { - ret = -EBUSY; - usb_ep_dequeue(ep->ep, req); - wait_for_completion(&done); - goto error_mutex; - } - } else { - ret = wait_for_completion_interruptible(&done); - if (ret < 0) { - usb_ep_dequeue(ep->ep, req); - wait_for_completion(&done); - interrupted = ep->status < 0; - } - } - - if (interrupted) { - ret = -EINTR; - } else { - ret = req->actual; - } - goto error_mutex; - } - else if (!(req = usb_ep_alloc_request(ep->ep, GFP_ATOMIC))) { - ret = -ENOMEM; - } - else { - req->buf = (void *)(ffsm->mem + io_data->buf - ffsm->vm_start); - req->length = data_len; - - io_data->ep = ep->ep; - io_data->req = req; - io_data->epfile = epfile; - - req->context = io_data; - req->complete = ffs_epfile_async_io_complete; - list_add(&req->list, &ep->req->list); - ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); - if (unlikely(ret)) { - usb_ep_free_request(ep->ep, req); - goto error_lock; - } - - ret = -EIOCBQUEUED; - } - -error_lock: - spin_unlock_irq(&epfile->ffs->eps_lock); -error_mutex: - mutex_unlock(&epfile->mutex); -error: - return ret; -} - -static long ffs_epfile_ioctl(struct file *file, unsigned code, unsigned long value) -{ - struct ffs_epfile *epfile = file->private_data; - struct ffs_ep *ep = epfile->ep; - int ret = 0; - struct generic_memory mem; - struct ffs_memory *ffsm = NULL; - - ENTER(); - - if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) - return -ENODEV; - - spin_lock_irq(&epfile->ffs->eps_lock); - - switch (code) { - case FUNCTIONFS_ENDPOINT_QUEUE_INIT: - ret = kfifo_alloc(&epfile->reqEventFifo, MAX_REQUEST * sizeof(struct UsbFnReqEvent), GFP_KERNEL); - break; - case FUNCTIONFS_ENDPOINT_QUEUE_DEL: - kfifo_free(&epfile->reqEventFifo); - break; - case FUNCTIONFS_ENDPOINT_RELEASE_BUF: - if (copy_from_user(&mem, (void __user *)value, sizeof(mem))) - { - pr_info("copy from user failed\n"); - return -EFAULT; - } - ffsm = generic_find_memory_area(epfile, mem.buf, mem.size); - if (ffsm == NULL) - { - return -EFAULT; - } - list_del(&ffsm->memlist); - kfree((void *)ffsm->mem); - kfree(ffsm); - break; - case FUNCTIONFS_ENDPOINT_READ: - case FUNCTIONFS_ENDPOINT_WRITE: - { - struct IoData myIoData; - struct ffs_io_data io_data, *p = &io_data; - ret = copy_from_user(&myIoData, (void __user *)value, sizeof(struct IoData)); - if (unlikely(ret)) { - spin_unlock_irq(&epfile->ffs->eps_lock); - return -EFAULT; - } - if (myIoData.aio) { - p = kmalloc(sizeof(io_data), GFP_KERNEL); - if (unlikely(!p)) { - spin_unlock_irq(&epfile->ffs->eps_lock); - return -ENOMEM; - } - } else { - memset(p, 0, sizeof(*p)); - } - memcpy(p, &myIoData, sizeof(struct IoData)); - - spin_unlock_irq(&epfile->ffs->eps_lock); - ret = ffs_epfile_iorw(file, p); - if (ret == -EIOCBQUEUED) { - return 0; - } - if (p->aio) - kfree(p); - return ret; - } - case FUNCTIONFS_ENDPOINT_RW_CANCEL: - { - struct usb_request *req; - struct IoData myIoData; - if (!ep) { - spin_unlock_irq(&epfile->ffs->eps_lock); - return -EFAULT; - } - ret = copy_from_user(&myIoData, (void __user *)value, sizeof(struct IoData)); - if (unlikely(ret)) { - spin_unlock_irq(&epfile->ffs->eps_lock); - return -EFAULT; - } - ffsm = generic_find_memory_area(epfile, myIoData.buf, myIoData.len); - if (ffsm == NULL) - { - return -EFAULT; - } - list_for_each_entry(req, &epfile->ep->req->list, list) { - if (req->buf == (void *)(ffsm->mem + myIoData.buf - ffsm->vm_start)) { - usb_ep_dequeue(epfile->ep->ep, req); - spin_unlock_irq(&epfile->ffs->eps_lock); - return 0; - } - } - if (epfile->ep->req->buf == (void *)(ffsm->mem + myIoData.buf - ffsm->vm_start)) { - usb_ep_dequeue(epfile->ep->ep, epfile->ep->req); - spin_unlock_irq(&epfile->ffs->eps_lock); - return 0; - } - spin_unlock_irq(&epfile->ffs->eps_lock); - return -EFAULT; - } - case FUNCTIONFS_ENDPOINT_GET_REQ_STATUS: - { - struct usb_request *req; - struct IoData myIoData; - if (!ep) { - spin_unlock_irq(&epfile->ffs->eps_lock); - return -EFAULT; - } - ret = copy_from_user(&myIoData,(void __user *)value, sizeof(struct IoData)); - if (unlikely(ret)) { - spin_unlock_irq(&epfile->ffs->eps_lock); - return -EFAULT; - } - ffsm = generic_find_memory_area(epfile, myIoData.buf, myIoData.len); - if (ffsm == NULL) - { - return -EFAULT; - } - list_for_each_entry(req, &epfile->ep->req->list, list) { - if (req->buf == (void *)(ffsm->mem + myIoData.buf - ffsm->vm_start)) { - spin_unlock_irq(&epfile->ffs->eps_lock); - return req->status; - } - } - spin_unlock_irq(&epfile->ffs->eps_lock); - return -EFAULT; - } - 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; - case FUNCTIONFS_ENDPOINT_DESC: - { - int desc_idx; - int i; - struct usb_endpoint_descriptor *desc; - - switch (epfile->ffs->speed) { - case USB_SPEED_SUPER: - desc_idx = 2; - break; - case USB_SPEED_HIGH: - desc_idx = 1; - break; - default: - desc_idx = 1; - } - for (i = 0; i < epfile->ffs->eps_count; i++) { - if (epfile->ffs->epfiles + i == epfile) - break; - } - ep = epfile->ffs->eps + i; - desc = ep->descs[desc_idx]; - spin_unlock_irq(&epfile->ffs->eps_lock); - ret = copy_to_user((void __user *)value, desc, desc->bLength); - if (ret) - ret = -EFAULT; - return ret; - } - default: - ret = -ENOTTY; - } - spin_unlock_irq(&epfile->ffs->eps_lock); - - return ret; -} - -static ssize_t ffs_epfile_read(struct file *file, char __user *buf, size_t count, loff_t *f_pos) -{ - int status = 0; - unsigned int copied = 0; - unsigned long flags; - struct ffs_epfile *epfile = file->private_data; - ENTER(); - if (kfifo_is_empty(&epfile->reqEventFifo)) { - return 0; - } - spin_lock_irqsave(&epfile->ffs->eps_lock, flags); - status = kfifo_to_user(&epfile->reqEventFifo, buf, count, &copied) == 0 ? copied : -1; - spin_unlock_irqrestore(&epfile->ffs->eps_lock, flags); - - return status; -} - -static ssize_t ffs_epfile_write(struct file *file, const char __user *buf, size_t count, loff_t *f_pos) -{ - return count; -} - -static unsigned int ffs_epfile_poll(struct file *file, struct poll_table_struct * wait) -{ - unsigned int mask = 0; - struct ffs_epfile *epfile = file->private_data; - ENTER(); - poll_wait(file, &epfile->wait_que, wait); - if (!kfifo_is_empty(&epfile->reqEventFifo)) { - mask |= POLLIN; - } - return mask; -} - -#ifdef CONFIG_COMPAT -static long ffs_epfile_compat_ioctl(struct file *file, unsigned code, - unsigned long value) -{ - return ffs_epfile_ioctl(file, code, value); -} -#endif - -static const struct file_operations ffs_epfile_operations = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .mmap = ffs_epfile_mmap, - .read = ffs_epfile_read, - .write = ffs_epfile_write, - .poll = ffs_epfile_poll, - .open = ffs_epfile_open, - .release = ffs_epfile_release, - .unlocked_ioctl = ffs_epfile_ioctl, -#ifdef CONFIG_COMPAT - .compat_ioctl = ffs_epfile_compat_ioctl, -#endif -}; - -/* 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 dev_t g_dev; -#define MAX_EP_DEV 10 -static long usbfn_ioctl(struct file *file, unsigned int cmd, unsigned long value) -{ - long ret; - ENTER(); - switch(cmd) - { - case FUNCTIONFS_NEWFN: - { - struct ffs_dev *ffs_dev; - struct ffs_data *ffs; - struct FuncNew newfn; - char nameEp0[MAX_NAMELEN]; - ret = copy_from_user(&newfn, (void __user *)value, sizeof(struct FuncNew )); - if (unlikely(ret)) { - return -EFAULT; - } - ffs = ffs_data_new(newfn.name); - if (unlikely(!ffs)) { - return (-ENOMEM); - } - - if (newfn.nameLen > MAX_NAMELEN) { - return -EPERM; - } - memcpy(ffs->dev_name, newfn.name, newfn.nameLen); - - if (unlikely(!ffs->dev_name)) { - ffs_data_put(ffs); - return (-ENOMEM); - } - - if (sprintf(nameEp0, "%s.ep%u", ffs->dev_name, 0) < 0) { - ffs_data_put(ffs); - return -EFAULT; - } - ffs_dev = ffs_acquire_dev(newfn.name); - if (IS_ERR(ffs_dev)) { - ffs_data_put(ffs); - return (-ENODEV); - } - ffs->private_data = ffs_dev; - - ret = alloc_chrdev_region(&g_dev, 0, MAX_EP_DEV, nameEp0); - if (ret < 0) { - ffs_release_dev(ffs); - ffs_data_put(ffs); - return -EBUSY; - } - cdev_init(&ffs->cdev, &ffs_ep0_operations); - ffs->devno = MKDEV(MAJOR(g_dev), 0); - ret = cdev_add(&ffs->cdev, ffs->devno, 1); - if (ret) { - ffs_release_dev(ffs); - ffs_data_put(ffs); - return -EBUSY; - } - - ffs->fn_device = device_create(ffs_class, NULL, ffs->devno, NULL, nameEp0); - if (IS_ERR(ffs->fn_device)) { - cdev_del(&ffs->cdev); - ffs_release_dev(ffs); - ffs_data_put(ffs); - return -EBUSY; - } - return 0; - } - case FUNCTIONFS_DELFN: - { - struct FuncNew newfn; - struct ffs_data *ffs; - struct ffs_dev *ffs_dev; - ret = copy_from_user(&newfn, (void __user *)value, sizeof(struct FuncNew )); - if (unlikely(ret)) { - return -EFAULT; - } - - ffs_dev = _ffs_find_dev(newfn.name); - if (IS_ERR(ffs_dev)) { - return -EFAULT; - } - ffs = ffs_dev->ffs_data; - device_destroy(ffs_class, ffs->devno); - cdev_del(&ffs->cdev); - unregister_chrdev_region(g_dev, MAX_EP_DEV); - ffs_release_dev(ffs); - ffs_data_clear(ffs); - destroy_workqueue(ffs->io_completion_wq); - kfree(ffs); - return 0; - } - default: - ret = -ENOTTY; - } - - return ret; -} - -static int usbfn_open(struct inode *inode, struct file *file) -{ - return 0; -} - -static int usbfn_release(struct inode *inode, struct file *file) -{ - return 0; -} - -static struct file_operations usbfn_fops = { - .owner = THIS_MODULE, - .unlocked_ioctl = usbfn_ioctl, - .open = usbfn_open, - .release = usbfn_release, -#ifdef CONFIG_COMPAT - .compat_ioctl = usbfn_ioctl, -#endif -}; - -static struct miscdevice usbfn_misc = { - .minor = MISC_DYNAMIC_MINOR, - .name = "usbfn", - .fops = &usbfn_fops, -}; - -/* Driver's main init/cleanup functions *************************************/ -static int functionfs_init(void) -{ - int ret; - - ENTER(); - ret = misc_register(&usbfn_misc); - if (likely(!ret)) - pr_info("file system registered\n"); - else - pr_err("failed registering file system (%d)\n", ret); - - //ffs_class = class_create(THIS_MODULE, "functionfs"); - ffs_class = class_create("functionfs"); - if (IS_ERR(ffs_class)) - return PTR_ERR(ffs_class); - - ffs_class->devnode = ffs_devnode; - - return ret; -} - -static void functionfs_cleanup(void) -{ - ENTER(); - class_destroy(ffs_class); - misc_deregister(&usbfn_misc); -} - -static void ffs_data_get(struct ffs_data *ffs) -{ - ENTER(); - refcount_inc(&ffs->ref); -} - -static void ffs_data_put(struct ffs_data *ffs) -{ - ENTER(); - if (unlikely(refcount_dec_and_test(&ffs->ref))) { - pr_info("%s(): freeing\n", __func__); - ffs_data_clear(ffs); - BUG_ON(waitqueue_active(&ffs->ev.waitq) || -#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,0,0) - swait_active(&ffs->ep0req_completion.wait) || -#else - waitqueue_active(&ffs->ep0req_completion.wait) || -#endif - waitqueue_active(&ffs->wait) || - waitqueue_active(&ffs->wait_que)); - destroy_workqueue(ffs->io_completion_wq); - kfree(ffs); - } -} - -static struct ffs_data *ffs_data_new(const char *dev_name) -{ - struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); - if (unlikely(!ffs)) - return NULL; - - ENTER(); - - ffs->io_completion_wq = alloc_ordered_workqueue("%s", 0, dev_name); - if (!ffs->io_completion_wq) { - kfree(ffs); - return NULL; - } - - refcount_set(&ffs->ref, 1); - atomic_set(&ffs->opened, 0); - ffs->state = FFS_READ_DESCRIPTORS; - mutex_init(&ffs->mutex); - spin_lock_init(&ffs->eps_lock); - spin_lock_init(&ffs->mem_lock); - init_waitqueue_head(&ffs->ev.waitq); - init_waitqueue_head(&ffs->wait); - init_waitqueue_head(&ffs->wait_que); - init_completion(&ffs->ep0req_completion); - INIT_LIST_HEAD(&ffs->memory_list); - ffs->ev.can_stall = 1; - - return ffs; -} - -static void ffs_data_clear(struct ffs_data *ffs) -{ - ENTER(); - - ffs_closed(ffs); - - BUG_ON(ffs->gadget); - - if (ffs->epfiles) - ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); - - if (ffs->ffs_eventfd) - eventfd_ctx_put(ffs->ffs_eventfd); - - kfree(ffs->raw_descs_data); - kfree(ffs->raw_strings); - kfree(ffs->stringtabs); -} - -static void ffs_data_reset(struct ffs_data *ffs) -{ - ENTER(); - - ffs_data_clear(ffs); - - ffs->epfiles = NULL; - ffs->raw_descs_data = NULL; - ffs->raw_descs = NULL; - ffs->raw_strings = NULL; - ffs->stringtabs = NULL; - - ffs->raw_descs_length = 0; - ffs->fs_descs_count = 0; - ffs->hs_descs_count = 0; - ffs->ss_descs_count = 0; - - ffs->strings_count = 0; - ffs->interfaces_count = 0; - ffs->eps_count = 0; - - ffs->ev.count = 0; - - ffs->state = FFS_READ_DESCRIPTORS; - ffs->setup_state = FFS_NO_SETUP; - ffs->flags = 0; -} - -static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) -{ - struct usb_gadget_strings **lang; - int first_id; - - ENTER(); - - if (WARN_ON(ffs->state != FFS_ACTIVE - || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) - return -EBADFD; - - first_id = usb_string_ids_n(cdev, ffs->strings_count); - if (unlikely(first_id < 0)) - return first_id; - - ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); - if (unlikely(!ffs->ep0req)) - return -ENOMEM; - ffs->ep0req->complete = ffs_ep0_complete; - ffs->ep0req->context = ffs; - INIT_LIST_HEAD(&ffs->ep0req->list); - - lang = ffs->stringtabs; - if (lang) { - for (; *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->speed = cdev->gadget->speed; - ffs_data_get(ffs); - return 0; -} - -static void functionfs_unbind(struct ffs_data *ffs) -{ - ENTER(); - - if (!WARN_ON(!ffs->gadget)) { - usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); - ffs->ep0req = NULL; - ffs->gadget = NULL; - clear_bit(FFS_FL_BOUND, &ffs->flags); - ffs_data_put(ffs); - } -} - -static int ffs_epfiles_create(struct ffs_data *ffs) -{ - struct ffs_epfile *epfile = NULL, *epfiles = NULL; - unsigned int i, count ,ret; - - 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_LIST_HEAD(&epfile->memory_list); - init_waitqueue_head(&epfile->wait_que); - if (ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) { - if (sprintf(epfile->name, "%s.ep%02x", ffs->dev_name, ffs->eps_addrmap[i]) < 0) { - return -EFAULT; - } - } else { - if (sprintf(epfile->name, "%s.ep%u", ffs->dev_name, i) < 0) { - return -EFAULT; - } - } - - cdev_init(&epfile->cdev, &ffs_epfile_operations); - epfile->devno=MKDEV(MAJOR(ffs->devno), i); - ret = cdev_add(&epfile->cdev, epfile->devno, 1); - if (ret) - { - ffs_epfiles_destroy(epfiles, i - 1); - return -EBUSY; - } - - epfile->device = device_create(ffs_class, NULL, epfile->devno, NULL, epfile->name); - if (IS_ERR(epfile->device)) - { - cdev_del(&epfile->cdev); - ffs_epfiles_destroy(epfiles, i - 1); - return -EBUSY; - } - } - - 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)); - device_destroy(ffs_class, epfile->devno); - cdev_del(&epfile->cdev); - } - - kfree(epfiles); -} - -static void ffs_func_eps_disable(struct ffs_function *func) -{ - struct ffs_ep *ep = func->eps; - struct ffs_epfile *epfile = func->ffs->epfiles; - unsigned count = func->ffs->eps_count; - unsigned long flags; - - spin_lock_irqsave(&func->ffs->eps_lock, flags); - while (count--) { - /* pending requests get nuked */ - if (likely(ep->ep)) - usb_ep_disable(ep->ep); - ++ep; - - if (epfile) { - epfile->ep = NULL; - ++epfile; - } - } - 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); - while(count--) { - ep->ep->driver_data = ep; - - ret = config_ep_by_speed(func->gadget, &func->function, ep->ep); - if (ret) { - pr_err("%s: config_ep_by_speed(%s) returned %d\n", - __func__, ep->ep->name, ret); - break; - } - - ret = usb_ep_enable(ep->ep); - if (likely(!ret)) { - epfile->ep = ep; - epfile->in = usb_endpoint_dir_in(ep->ep->desc); - epfile->isoc = usb_endpoint_xfer_isoc(ep->ep->desc); - } else { - break; - } - - ++ep; - ++epfile; - } - - wake_up_interruptible(&ffs->wait); - 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 -}; - -enum ffs_os_desc_type { - FFS_OS_DESC, FFS_OS_DESC_EXT_COMPAT, FFS_OS_DESC_EXT_PROP -}; - -typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, u8 *valuep, - struct usb_descriptor_header *desc, - void *priv); - -typedef int (*ffs_os_desc_callback)(enum ffs_os_desc_type entity, - struct usb_os_desc_header *h, void *data, - unsigned len, void *priv); - -static int __must_check ffs_do_single_desc(char *data, unsigned len, - ffs_entity_callback entity, - void *priv) -{ - struct usb_descriptor_header *_ds = (void *)data; - u8 length; - int ret; - - ENTER(); - - /* At least two bytes are required: length and type */ - if (len < 2) { - pr_vdebug("descriptor too short\n"); - return -EINVAL; - } - - /* If we have at least as many bytes as the descriptor takes? */ - length = _ds->bLength; - if (len < length) { - pr_vdebug("descriptor longer then available data\n"); - return -EINVAL; - } - -#define __entity_check_INTERFACE(val) 1 -#define __entity_check_STRING(val) (val) -#define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) -#define __entity(type, val) do { \ - pr_vdebug("entity " #type "(%02x)\n", (val)); \ - if (unlikely(!__entity_check_ ##type(val))) { \ - pr_vdebug("invalid entity's value\n"); \ - return -EINVAL; \ - } \ - ret = entity(FFS_ ##type, &val, _ds, priv); \ - if (unlikely(ret < 0)) { \ - pr_debug("entity " #type "(%02x); ret = %d\n", \ - (val), ret); \ - return ret; \ - } \ - } while (0) - - /* Parse descriptor depending on type. */ - switch (_ds->bDescriptorType) { - case USB_DT_DEVICE: - case USB_DT_CONFIG: - case USB_DT_STRING: - case USB_DT_DEVICE_QUALIFIER: - /* function can't have any of those */ - pr_vdebug("descriptor reserved for gadget: %d\n", - _ds->bDescriptorType); - return -EINVAL; - - case USB_DT_INTERFACE: { - struct usb_interface_descriptor *ds = (void *)_ds; - pr_vdebug("interface descriptor\n"); - if (length != sizeof *ds) - goto inv_length; - - __entity(INTERFACE, ds->bInterfaceNumber); - if (ds->iInterface) - __entity(STRING, ds->iInterface); - } - break; - - case USB_DT_ENDPOINT: { - struct usb_endpoint_descriptor *ds = (void *)_ds; - pr_vdebug("endpoint descriptor\n"); - if (length != USB_DT_ENDPOINT_SIZE && - length != USB_DT_ENDPOINT_AUDIO_SIZE) - goto inv_length; - __entity(ENDPOINT, ds->bEndpointAddress); - } - break; - - case HID_DT_HID: - pr_vdebug("hid descriptor\n"); - if (length != sizeof(struct hid_descriptor)) - goto inv_length; - break; - - case USB_DT_OTG: - if (length != sizeof(struct usb_otg_descriptor)) - goto inv_length; - break; - - case USB_DT_INTERFACE_ASSOCIATION: { - struct usb_interface_assoc_descriptor *ds = (void *)_ds; - pr_vdebug("interface association descriptor\n"); - if (length != sizeof *ds) - goto inv_length; - if (ds->iFunction) - __entity(STRING, ds->iFunction); - } - break; - - case USB_DT_SS_ENDPOINT_COMP: - pr_vdebug("EP SS companion descriptor\n"); - if (length != sizeof(struct usb_ss_ep_comp_descriptor)) - goto inv_length; - break; - - case USB_DT_OTHER_SPEED_CONFIG: - case USB_DT_INTERFACE_POWER: - case USB_DT_DEBUG: - case USB_DT_SECURITY: - case USB_DT_CS_RADIO_CONTROL: - pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); - break; - default: - /* We should never be here */ - pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); - break; -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; - uintptr_t 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_single_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_desc_helper *helper = priv; - struct usb_endpoint_descriptor *d = NULL; - - 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 >= helper->interfaces_count) - helper->interfaces_count = *valuep + 1; - break; - - case FFS_STRING: - /* - * Strings are indexed from 1 (0 is reserved - * for languages list) - */ - if (*valuep > helper->ffs->strings_count) - helper->ffs->strings_count = *valuep; - break; - - case FFS_ENDPOINT: - d = (void *)desc; - helper->eps_count++; - if (helper->eps_count >= FFS_MAX_EPS_COUNT) - return -EINVAL; - /* Check if descriptors for any speed were already parsed */ - if (!helper->ffs->eps_count && !helper->ffs->interfaces_count) - helper->ffs->eps_addrmap[helper->eps_count] = - d->bEndpointAddress; - else if (helper->ffs->eps_addrmap[helper->eps_count] != - d->bEndpointAddress) - return -EINVAL; - break; - } - - return 0; -} - -static int __ffs_do_os_desc_header(enum ffs_os_desc_type *next_type, - struct usb_os_desc_header *desc) -{ - u16 bcd_version = le16_to_cpu(desc->bcdVersion); - u16 w_index = le16_to_cpu(desc->wIndex); - - if (bcd_version != 1) { - pr_vdebug("unsupported os descriptors version: %d", - bcd_version); - return -EINVAL; - } - switch (w_index) { - case 0x4: - *next_type = FFS_OS_DESC_EXT_COMPAT; - break; - case 0x5: - *next_type = FFS_OS_DESC_EXT_PROP; - break; - default: - pr_vdebug("unsupported os descriptor type: %d", w_index); - return -EINVAL; - } - - return sizeof(*desc); -} - -/* - * Process all extended compatibility/extended property descriptors - * of a feature descriptor - */ -static int __must_check ffs_do_single_os_desc(char *data, unsigned len, - enum ffs_os_desc_type type, - u16 feature_count, - ffs_os_desc_callback entity, - void *priv, - struct usb_os_desc_header *h) -{ - int ret; - const unsigned _len = len; - - ENTER(); - - /* loop over all ext compat/ext prop descriptors */ - while (feature_count--) { - ret = entity(type, h, data, len, priv); - if (unlikely(ret < 0)) { - pr_debug("bad OS descriptor, type: %d\n", type); - return ret; - } - data += ret; - len -= ret; - } - return _len - len; -} - -/* Process a number of complete Feature Descriptors (Ext Compat or Ext Prop) */ -static int __must_check ffs_do_os_descs(unsigned count, - char *data, unsigned len, - ffs_os_desc_callback entity, void *priv) -{ - const unsigned _len = len; - unsigned long num = 0; - - ENTER(); - - for (num = 0; num < count; ++num) { - int ret; - enum ffs_os_desc_type type; - u16 feature_count; - struct usb_os_desc_header *desc = (void *)data; - - if (len < sizeof(*desc)) - return -EINVAL; - - /* - * Record "descriptor" entity. - * Process dwLength, bcdVersion, wIndex, get b/wCount. - * Move the data pointer to the beginning of extended - * compatibilities proper or extended properties proper - * portions of the data - */ - if (le32_to_cpu(desc->dwLength) > len) - return -EINVAL; - - ret = __ffs_do_os_desc_header(&type, desc); - if (unlikely(ret < 0)) { - pr_debug("entity OS_DESCRIPTOR(%02lx); ret = %d\n", - num, ret); - return ret; - } - /* - * 16-bit hex "?? 00" Little Endian looks like 8-bit hex "??" - */ - feature_count = le16_to_cpu(desc->wCount); - if (type == FFS_OS_DESC_EXT_COMPAT && - (feature_count > 255 || desc->Reserved)) - return -EINVAL; - len -= ret; - data += ret; - - /* - * Process all function/property descriptors - * of this Feature Descriptor - */ - ret = ffs_do_single_os_desc(data, len, type, - feature_count, entity, priv, desc); - if (unlikely(ret < 0)) { - pr_debug("%s returns %d\n", __func__, ret); - return ret; - } - - len -= ret; - data += ret; - } - return _len - len; -} - -/** - * Validate contents of the buffer from userspace related to OS descriptors. - */ -static int __ffs_data_do_os_desc(enum ffs_os_desc_type type, - struct usb_os_desc_header *h, void *data, - unsigned len, void *priv) -{ - struct ffs_data *ffs = priv; - u8 length; - - ENTER(); - - switch (type) { - case FFS_OS_DESC_EXT_COMPAT: { - struct usb_ext_compat_desc *d = data; - int i; - - if (len < sizeof(*d) || - d->bFirstInterfaceNumber >= ffs->interfaces_count) - return -EINVAL; - if (d->Reserved1 != 1) { - /* - * According to the spec, Reserved1 must be set to 1 - * but older kernels incorrectly rejected non-zero - * values. We fix it here to avoid returning EINVAL - * in response to values we used to accept. - */ - pr_debug("usb_ext_compat_desc::Reserved1 forced to 1\n"); - d->Reserved1 = 1; - } - for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i) - if (d->Reserved2[i]) - return -EINVAL; - - length = sizeof(struct usb_ext_compat_desc); - } - break; - case FFS_OS_DESC_EXT_PROP: { - struct usb_ext_prop_desc *d = data; - u32 type, pdl; - u16 pnl; - - if (len < sizeof(*d) || h->interface >= ffs->interfaces_count) - return -EINVAL; - length = le32_to_cpu(d->dwSize); - if (len < length) - return -EINVAL; - type = le32_to_cpu(d->dwPropertyDataType); - if (type < USB_EXT_PROP_UNICODE || - type > USB_EXT_PROP_UNICODE_MULTI) { - pr_vdebug("unsupported os descriptor property type: %d", - type); - return -EINVAL; - } - pnl = le16_to_cpu(d->wPropertyNameLength); - if (length < 14 + pnl) { - pr_vdebug("invalid os descriptor length: %d pnl:%d (descriptor %d)\n", - length, pnl, type); - return -EINVAL; - } - pdl = le32_to_cpu(*(__le32 *)((u8 *)data + 10 + pnl)); - if (length != 14 + pnl + pdl) { - pr_vdebug("invalid os descriptor length: %d pnl:%d pdl:%d (descriptor %d)\n", - length, pnl, pdl, type); - return -EINVAL; - } - ++ffs->ms_os_descs_ext_prop_count; - /* property name reported to the host as "WCHAR"s */ - ffs->ms_os_descs_ext_prop_name_len += pnl * 2; - ffs->ms_os_descs_ext_prop_data_len += pdl; - } - break; - default: - pr_vdebug("unknown descriptor: %d\n", type); - return -EINVAL; - } - return length; -} - -static int __ffs_data_got_descs(struct ffs_data *ffs, - char *const _data, size_t len) -{ - char *data = _data, *raw_descs = NULL; - unsigned os_descs_count = 0, counts[3], flags; - int ret = -EINVAL, i; - struct ffs_desc_helper helper; - - ENTER(); - - if (get_unaligned_le32(data + 4) != len) - goto error; - - switch (get_unaligned_le32(data)) { - case FUNCTIONFS_DESCRIPTORS_MAGIC: - flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC; - data += 8; - len -= 8; - break; - case FUNCTIONFS_DESCRIPTORS_MAGIC_V2: - flags = get_unaligned_le32(data + 8); - ffs->user_flags = flags; - if (flags & ~(FUNCTIONFS_HAS_FS_DESC | - FUNCTIONFS_HAS_HS_DESC | - FUNCTIONFS_HAS_SS_DESC | - FUNCTIONFS_HAS_MS_OS_DESC | - FUNCTIONFS_VIRTUAL_ADDR | - FUNCTIONFS_EVENTFD | - FUNCTIONFS_ALL_CTRL_RECIP | - FUNCTIONFS_CONFIG0_SETUP)) { - ret = -ENOSYS; - goto error; - } - data += 12; - len -= 12; - break; - default: - goto error; - } - - if (flags & FUNCTIONFS_EVENTFD) { - if (len < 4) - goto error; - ffs->ffs_eventfd = - eventfd_ctx_fdget((int)get_unaligned_le32(data)); - if (IS_ERR(ffs->ffs_eventfd)) { - ret = PTR_ERR(ffs->ffs_eventfd); - ffs->ffs_eventfd = NULL; - goto error; - } - data += 4; - len -= 4; - } - - /* Read fs_count, hs_count and ss_count (if present) */ - for (i = 0; i < 3; ++i) { - if (!(flags & (1 << i))) { - counts[i] = 0; - } else if (len < 4) { - goto error; - } else { - counts[i] = get_unaligned_le32(data); - data += 4; - len -= 4; - } - } - if (flags & (1 << i)) { - if (len < 4) { - goto error; - } - os_descs_count = get_unaligned_le32(data); - data += 4; - len -= 4; - } - - /* Read descriptors */ - raw_descs = data; - helper.ffs = ffs; - for (i = 0; i < 3; ++i) { - if (!counts[i]) - continue; - helper.interfaces_count = 0; - helper.eps_count = 0; - ret = ffs_do_descs(counts[i], data, len, - __ffs_data_do_entity, &helper); - if (ret < 0) - goto error; - if (!ffs->eps_count && !ffs->interfaces_count) { - ffs->eps_count = helper.eps_count; - ffs->interfaces_count = helper.interfaces_count; - } else { - if (ffs->eps_count != helper.eps_count) { - ret = -EINVAL; - goto error; - } - if (ffs->interfaces_count != helper.interfaces_count) { - ret = -EINVAL; - goto error; - } - } - data += ret; - len -= ret; - } - if (os_descs_count) { - ret = ffs_do_os_descs(os_descs_count, data, len, - __ffs_data_do_os_desc, ffs); - if (ret < 0) - goto error; - data += ret; - len -= ret; - } - - if (raw_descs == data || len) { - ret = -EINVAL; - goto error; - } - - ffs->raw_descs_data = _data; - ffs->raw_descs = raw_descs; - ffs->raw_descs_length = data - raw_descs; - ffs->fs_descs_count = counts[0]; - ffs->hs_descs_count = counts[1]; - ffs->ss_descs_count = counts[2]; - ffs->ms_os_descs_count = os_descs_count; - - return 0; - -error: - kfree(_data); - return ret; -} - -static int __ffs_data_got_strings(struct ffs_data *ffs, - char *const _data, size_t len) -{ - u32 str_count, needed_count, lang_count; - struct usb_gadget_strings **stringtabs = NULL, *t = NULL; - const char *data = _data; - struct usb_string *s = NULL; - - ENTER(); - - if (unlikely(len < 16 || - get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || - get_unaligned_le32(data + 4) != len)) - goto error; - str_count = get_unaligned_le32(data + 8); - lang_count = get_unaligned_le32(data + 12); - - /* if one is zero the other must be zero */ - if (unlikely(!str_count != !lang_count)) - goto error; - - /* Do we have at least as many strings as descriptors need? */ - needed_count = ffs->strings_count; - if (unlikely(str_count < needed_count)) - goto error; - - /* - * If we don't need any strings just return and free all - * memory. - */ - if (!needed_count) { - kfree(_data); - return 0; - } - - /* Allocate everything in one chunk so there's less maintenance. */ - { - unsigned i = 0; - vla_group(d); - vla_item(d, struct usb_gadget_strings *, stringtabs, - lang_count + 1); - vla_item(d, struct usb_gadget_strings, stringtab, lang_count); - vla_item(d, struct usb_string, strings, - lang_count*(needed_count+1)); - - char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); - - if (unlikely(!vlabuf)) { - kfree(_data); - return -ENOMEM; - } - - /* Initialize the VLA pointers */ - stringtabs = vla_ptr(vlabuf, d, stringtabs); - t = vla_ptr(vlabuf, d, stringtab); - i = lang_count; - do { - *stringtabs++ = t++; - } while (--i); - *stringtabs = NULL; - - /* stringtabs = vlabuf = d_stringtabs for later kfree */ - stringtabs = vla_ptr(vlabuf, d, stringtabs); - t = vla_ptr(vlabuf, d, stringtab); - s = vla_ptr(vlabuf, d, strings); - } - - /* For each language */ - data += 16; - len -= 16; - - do { /* lang_count > 0 so we can use do-while */ - unsigned needed = needed_count; - - if (unlikely(len < 3)) - goto error_free; - t->language = get_unaligned_le16(data); - t->strings = s; - ++t; - - data += 2; - len -= 2; - - /* For each string */ - do { /* str_count > 0 so we can use do-while */ - size_t length = strnlen(data, len); - - if (unlikely(length == len)) - goto error_free; - - /* - * User may provide more strings then we need, - * if that's the case we simply ignore the - * rest - */ - if (likely(needed)) { - /* - * s->id will be set while adding - * function to configuration so for - * now just leave garbage here. - */ - s->s = data; - --needed; - ++s; - } - - data += length + 1; - len -= length + 1; - } while (--str_count); - - s->id = 0; /* terminator */ - s->s = NULL; - ++s; - - } while (--lang_count); - - /* Some garbage left? */ - if (unlikely(len)) - goto error_free; - - /* Done! */ - ffs->stringtabs = stringtabs; - ffs->raw_strings = _data; - - return 0; - -error_free: - kfree(stringtabs); -error: - kfree(_data); - return -EINVAL; -} - -/* Events handling and management *******************************************/ -static void __ffs_event_add(struct ffs_data *ffs, - enum usb_functionfs_event_type type) -{ - enum usb_functionfs_event_type rem_type1, rem_type2 = type; - int neg = 0; - - /* - * Abort any unhandled setup - * - * We do not need to worry about some cmpxchg() changing value - * of ffs->setup_state without holding the lock because when - * state is FFS_SETUP_PENDING cmpxchg() in several places in - * the source does nothing. - */ - if (ffs->setup_state == FFS_SETUP_PENDING) - ffs->setup_state = FFS_SETUP_CANCELLED; - - /* - * Logic of this function guarantees that there are at most four pending - * evens on ffs->ev.types queue. This is important because the queue - * has space for four elements only and __ffs_ep0_read_events function - * depends on that limit as well. If more event types are added, those - * limits have to be revisited or guaranteed to still hold. - */ - 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: - WARN(1, "%d: unknown event, this should not happen\n", type); - return; - } - - { - 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); - if (ffs->ffs_eventfd) - eventfd_signal(ffs->ffs_eventfd, 1); -} - -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_ep_addr2idx(struct ffs_data *ffs, u8 endpoint_address) -{ - int i; - - for (i = 1; i < ARRAY_SIZE(ffs->eps_addrmap); ++i) - if (ffs->eps_addrmap[i] == endpoint_address) - return i; - return -ENOENT; -} - -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 = NULL; - unsigned ep_desc_id; - int idx; - static const char *speed_names[] = { "full", "high", "super" }; - - if (type != FFS_DESCRIPTOR) - return 0; - - /* - * If ss_descriptors is not NULL, we are reading super speed - * descriptors; if hs_descriptors is not NULL, we are reading high - * speed descriptors; otherwise, we are reading full speed - * descriptors. - */ - if (func->function.ss_descriptors) { - ep_desc_id = 2; - func->function.ss_descriptors[(uintptr_t)valuep] = desc; - } else if (func->function.hs_descriptors) { - ep_desc_id = 1; - func->function.hs_descriptors[(uintptr_t)valuep] = desc; - } else { - ep_desc_id = 0; - func->function.fs_descriptors[(uintptr_t)valuep] = desc; - } - - if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) - return 0; - - idx = ffs_ep_addr2idx(func->ffs, ds->bEndpointAddress) - 1; - if (idx < 0) - return idx; - - ffs_ep = func->eps + idx; - - if (unlikely(ffs_ep->descs[ep_desc_id])) { - pr_err("two %sspeed descriptors for EP %d\n", - speed_names[ep_desc_id], - ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); - return -EINVAL; - } - ffs_ep->descs[ep_desc_id] = ds; - - ffs_dump_mem(": Original ep desc", ds, ds->bLength); - if (ffs_ep->ep) { - ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; - if (!ds->wMaxPacketSize) - ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; - } else { - struct usb_request *req = NULL; - struct usb_ep *ep = NULL; - u8 bEndpointAddress; - - /* - * We back up bEndpointAddress because autoconfig overwrites - * it with physical endpoint address. - */ - bEndpointAddress = ds->bEndpointAddress; - 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; - INIT_LIST_HEAD(&ffs_ep->req->list); - func->eps_revmap[ds->bEndpointAddress & - USB_ENDPOINT_NUMBER_MASK] = idx + 1; - /* - * If we use virtual address mapping, we restore - * original bEndpointAddress value. - */ - if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) - ds->bEndpointAddress = bEndpointAddress; - } - 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_do_os_desc(enum ffs_os_desc_type type, - struct usb_os_desc_header *h, void *data, - unsigned len, void *priv) -{ - struct ffs_function *func = priv; - u8 length = 0; - - switch (type) { - case FFS_OS_DESC_EXT_COMPAT: { - struct usb_ext_compat_desc *desc = data; - struct usb_os_desc_table *t; - - t = &func->function.os_desc_table[desc->bFirstInterfaceNumber]; - t->if_id = func->interfaces_nums[desc->bFirstInterfaceNumber]; - memcpy(t->os_desc->ext_compat_id, &desc->CompatibleID, - ARRAY_SIZE(desc->CompatibleID) + ARRAY_SIZE(desc->SubCompatibleID)); - length = sizeof(*desc); - } - break; - case FFS_OS_DESC_EXT_PROP: { - struct usb_ext_prop_desc *desc = data; - struct usb_os_desc_table *t; - struct usb_os_desc_ext_prop *ext_prop; - char *ext_prop_name; - char *ext_prop_data; - - t = &func->function.os_desc_table[h->interface]; - t->if_id = func->interfaces_nums[h->interface]; - - ext_prop = func->ffs->ms_os_descs_ext_prop_avail; - func->ffs->ms_os_descs_ext_prop_avail += sizeof(*ext_prop); - - ext_prop->type = le32_to_cpu(desc->dwPropertyDataType); - ext_prop->name_len = le16_to_cpu(desc->wPropertyNameLength); - ext_prop->data_len = le32_to_cpu(*(__le32 *) - usb_ext_prop_data_len_ptr(data, ext_prop->name_len)); - length = ext_prop->name_len + ext_prop->data_len + 14; - - ext_prop_name = func->ffs->ms_os_descs_ext_prop_name_avail; - func->ffs->ms_os_descs_ext_prop_name_avail += - ext_prop->name_len; - - ext_prop_data = func->ffs->ms_os_descs_ext_prop_data_avail; - func->ffs->ms_os_descs_ext_prop_data_avail += - ext_prop->data_len; - memcpy(ext_prop_data, usb_ext_prop_data_ptr(data, ext_prop->name_len), - ext_prop->data_len); - /* unicode data reported to the host as "WCHAR"s */ - switch (ext_prop->type) { - case USB_EXT_PROP_UNICODE: - case USB_EXT_PROP_UNICODE_ENV: - case USB_EXT_PROP_UNICODE_LINK: - case USB_EXT_PROP_UNICODE_MULTI: - ext_prop->data_len *= 2; - break; - } - ext_prop->data = ext_prop_data; - - memcpy(ext_prop_name, usb_ext_prop_name_ptr(data), - ext_prop->name_len); - /* property name reported to the host as "WCHAR"s */ - ext_prop->name_len *= 2; - ext_prop->name = ext_prop_name; - - t->os_desc->ext_prop_len += - ext_prop->name_len + ext_prop->data_len + 14; - ++t->os_desc->ext_prop_count; - list_add_tail(&ext_prop->entry, &t->os_desc->ext_prop); - } - break; - default: - pr_vdebug("unknown descriptor: %d\n", type); - } - - return length; -} - -static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f, - struct usb_configuration *c) -{ - struct ffs_function *func = ffs_func_from_usb(f); - struct f_fs_opts *ffs_opts = - container_of(f->fi, struct f_fs_opts, func_inst); - int ret; - - ENTER(); - - /* - * Legacy gadget triggers binding in functionfs_ready_callback, - * which already uses locking; taking the same lock here would - * cause a deadlock. - * - * Configfs-enabled gadgets however do need ffs_dev_lock. - */ - if (!ffs_opts->no_configfs) - ffs_dev_lock(); - ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV; - func->ffs = ffs_opts->dev->ffs_data; - if (!ffs_opts->no_configfs) - ffs_dev_unlock(); - if (ret) - return ERR_PTR(ret); - - func->conf = c; - func->gadget = c->cdev->gadget; - - /* - * in drivers/usb/gadget/configfs.c:configfs_composite_bind() - * configurations are bound in sequence with list_for_each_entry, - * in each configuration its functions are bound in sequence - * with list_for_each_entry, so we assume no race condition - * with regard to ffs_opts->bound access - */ - if (!ffs_opts->refcnt) { - ret = functionfs_bind(func->ffs, c->cdev); - if (ret) - return ERR_PTR(ret); - } - ffs_opts->refcnt++; - func->function.strings = func->ffs->stringtabs; - - return ffs_opts; -} - -static int _ffs_func_bind(struct usb_configuration *c, struct usb_function *f) -{ - struct ffs_function *func = ffs_func_from_usb(f); - struct ffs_data *ffs = func->ffs; - - const int full = !!func->ffs->fs_descs_count; - const int high = !!func->ffs->hs_descs_count; - const int super = !!func->ffs->ss_descs_count; - - int fs_len, hs_len, ss_len, ret, i; - struct ffs_ep *eps_ptr = NULL; - struct usb_descriptor_header *des_head = NULL; - struct usb_interface_descriptor *intf_ctl = NULL; - struct usb_interface_descriptor *intf_data = NULL; - /* Make it a single chunk, less management later on */ - vla_group(d); - vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count); - vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs, - full ? ffs->fs_descs_count + 1 : 0); - vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs, - high ? ffs->hs_descs_count + 1 : 0); - vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs, - super ? ffs->ss_descs_count + 1 : 0); - vla_item_with_sz(d, short, inums, ffs->interfaces_count); - vla_item_with_sz(d, struct usb_os_desc_table, os_desc_table, - c->cdev->use_os_string ? ffs->interfaces_count : 0); - vla_item_with_sz(d, char[16], ext_compat, - c->cdev->use_os_string ? ffs->interfaces_count : 0); - vla_item_with_sz(d, struct usb_os_desc, os_desc, - c->cdev->use_os_string ? ffs->interfaces_count : 0); - vla_item_with_sz(d, struct usb_os_desc_ext_prop, ext_prop, - ffs->ms_os_descs_ext_prop_count); - vla_item_with_sz(d, char, ext_prop_name, - ffs->ms_os_descs_ext_prop_name_len); - vla_item_with_sz(d, char, ext_prop_data, - ffs->ms_os_descs_ext_prop_data_len); - vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length); - char *vlabuf = NULL; - - ENTER(); - - /* Has descriptors only for speeds gadget does not support */ - if (unlikely(!(full | high | super))) - return -ENOTSUPP; - - /* Allocate a single chunk, less management later on */ - vlabuf = kzalloc(vla_group_size(d), GFP_KERNEL); - if (unlikely(!vlabuf)) - return -ENOMEM; - - ffs->ms_os_descs_ext_prop_avail = vla_ptr(vlabuf, d, ext_prop); - ffs->ms_os_descs_ext_prop_name_avail = - vla_ptr(vlabuf, d, ext_prop_name); - ffs->ms_os_descs_ext_prop_data_avail = - vla_ptr(vlabuf, d, ext_prop_data); - - /* Copy descriptors */ - memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs, ffs->raw_descs_length); - - memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz); - - eps_ptr = vla_ptr(vlabuf, d, eps); - for (i = 0; i < ffs->eps_count; i++) - eps_ptr[i].num = -1; - - /* Save pointers - * d_eps == vlabuf, func->eps used to kfree vlabuf later - */ - func->eps = vla_ptr(vlabuf, d, eps); - func->interfaces_nums = vla_ptr(vlabuf, d, inums); - - /* - * Go through all the endpoint descriptors and allocate - * endpoints first, so that later we can rewrite the endpoint - * numbers without worrying that it may be described later on. - */ - if (likely(full)) { - func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs); - fs_len = ffs_do_descs(ffs->fs_descs_count, - vla_ptr(vlabuf, d, raw_descs), - d_raw_descs__sz, - __ffs_func_bind_do_descs, func); - if (unlikely(fs_len < 0)) { - ret = fs_len; - goto error; - } - } else { - fs_len = 0; - } - if (likely(high)) { - func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs); - hs_len = ffs_do_descs(ffs->hs_descs_count, - vla_ptr(vlabuf, d, raw_descs) + fs_len, - d_raw_descs__sz - fs_len, - __ffs_func_bind_do_descs, func); - if (unlikely(hs_len < 0)) { - ret = hs_len; - goto error; - } - } else { - hs_len = 0; - } - if (likely(super)) { - func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs); - ss_len = ffs_do_descs(ffs->ss_descs_count, - vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len, - d_raw_descs__sz - fs_len - hs_len, - __ffs_func_bind_do_descs, func); - if (unlikely(ss_len < 0)) { - ret = ss_len; - goto error; - } - } else { - ss_len = 0; - } - /* - * Now handle interface numbers allocation and interface and - * endpoint numbers rewriting. We can do that in one go - * now. - */ - ret = ffs_do_descs(ffs->fs_descs_count + - (high ? ffs->hs_descs_count : 0) + - (super ? ffs->ss_descs_count : 0), - vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz, - __ffs_func_bind_do_nums, func); - if (unlikely(ret < 0)) - goto error; - - func->function.os_desc_table = vla_ptr(vlabuf, d, os_desc_table); - if (c->cdev->use_os_string) { - for (i = 0; i < ffs->interfaces_count; ++i) { - struct usb_os_desc *desc; - - desc = func->function.os_desc_table[i].os_desc = - vla_ptr(vlabuf, d, os_desc) + - i * sizeof(struct usb_os_desc); - desc->ext_compat_id = - vla_ptr(vlabuf, d, ext_compat) + i * 16; - INIT_LIST_HEAD(&desc->ext_prop); - } - ret = ffs_do_os_descs(ffs->ms_os_descs_count, - vla_ptr(vlabuf, d, raw_descs) + - fs_len + hs_len + ss_len, - d_raw_descs__sz - fs_len - hs_len - - ss_len, - __ffs_func_bind_do_os_desc, func); - if (unlikely(ret < 0)) - goto error; - } - func->function.os_desc_n = - c->cdev->use_os_string ? ffs->interfaces_count : 0; - - for (i = 0; i< func->ffs->fs_descs_count; i++) { - des_head = func->function.fs_descriptors[i]; - if (des_head->bDescriptorType == USB_DT_INTERFACE) { - struct usb_interface_descriptor *intf = (struct usb_interface_descriptor *)des_head; - if (intf->bNumEndpoints > 0) { - if (intf_ctl == NULL) { - intf_ctl = intf; - } else { - intf_data = intf; - break; - } - } - } - } - for (i = 0; i< func->ffs->fs_descs_count; i++) { - des_head = func->function.fs_descriptors[i]; - if (des_head->bDescriptorType == USB_DT_INTERFACE_ASSOCIATION) { - struct usb_interface_assoc_descriptor *a_dec = (struct usb_interface_assoc_descriptor *)des_head; - a_dec->bFirstInterface = intf_ctl->bInterfaceNumber; - } else if (des_head->bDescriptorType == USB_DT_CS_INTERFACE) { - struct usb_cdc_header_desc *cs_des = (struct usb_cdc_header_desc *)des_head; - if (cs_des->bDescriptorSubType == USB_CDC_CALL_MANAGEMENT_TYPE) { - struct usb_cdc_call_mgmt_descriptor *mgmt_des = (struct usb_cdc_call_mgmt_descriptor *)des_head; - mgmt_des->bDataInterface = intf_data->bInterfaceNumber; - } else if (cs_des->bDescriptorSubType == USB_CDC_UNION_TYPE) { - struct usb_cdc_union_desc *union_des = (struct usb_cdc_union_desc *)des_head; - union_des->bMasterInterface0 = intf_ctl->bInterfaceNumber; - union_des->bSlaveInterface0 = intf_data->bInterfaceNumber; - } else if (cs_des->bDescriptorSubType == USB_CDC_ETHERNET_TYPE) { - struct usb_cdc_ether_desc *ether_des = (struct usb_cdc_ether_desc *)des_head; - ether_des->iMACAddress = intf_ctl->iInterface + 1; - } - } - } - for (i = 0; i< func->ffs->hs_descs_count; i++) { - des_head = func->function.hs_descriptors[i]; - if (des_head->bDescriptorType == USB_DT_INTERFACE_ASSOCIATION) { - struct usb_interface_assoc_descriptor *a_dec = (struct usb_interface_assoc_descriptor *)des_head; - a_dec->bFirstInterface = intf_ctl->bInterfaceNumber; - } else if (des_head->bDescriptorType == USB_DT_CS_INTERFACE) { - struct usb_cdc_header_desc *cs_des = (struct usb_cdc_header_desc *)des_head; - if (cs_des->bDescriptorSubType == USB_CDC_CALL_MANAGEMENT_TYPE) { - struct usb_cdc_call_mgmt_descriptor *mgmt_des = (struct usb_cdc_call_mgmt_descriptor *)des_head; - mgmt_des->bDataInterface = intf_data->bInterfaceNumber; - } else if (cs_des->bDescriptorSubType == USB_CDC_UNION_TYPE) { - struct usb_cdc_union_desc *union_des = (struct usb_cdc_union_desc *)des_head; - union_des->bMasterInterface0 = intf_ctl->bInterfaceNumber; - union_des->bSlaveInterface0 = intf_data->bInterfaceNumber; - } else if (cs_des->bDescriptorSubType == USB_CDC_ETHERNET_TYPE) { - struct usb_cdc_ether_desc *ether_des = (struct usb_cdc_ether_desc *)des_head; - ether_des->iMACAddress = intf_ctl->iInterface + 1; - } - } - } - for (i = 0; i< func->ffs->ss_descs_count; i++) { - des_head = func->function.ss_descriptors[i]; - if (des_head->bDescriptorType == USB_DT_INTERFACE_ASSOCIATION) { - struct usb_interface_assoc_descriptor *a_dec = (struct usb_interface_assoc_descriptor *)des_head; - a_dec->bFirstInterface = intf_ctl->bInterfaceNumber; - } else if (des_head->bDescriptorType == USB_DT_CS_INTERFACE) { - struct usb_cdc_header_desc *cs_des = (struct usb_cdc_header_desc *)des_head; - if (cs_des->bDescriptorSubType == USB_CDC_CALL_MANAGEMENT_TYPE) { - struct usb_cdc_call_mgmt_descriptor *mgmt_des = (struct usb_cdc_call_mgmt_descriptor *)des_head; - mgmt_des->bDataInterface = intf_data->bInterfaceNumber; - } else if (cs_des->bDescriptorSubType == USB_CDC_UNION_TYPE) { - struct usb_cdc_union_desc *union_des = (struct usb_cdc_union_desc *)des_head; - union_des->bMasterInterface0 = intf_ctl->bInterfaceNumber; - union_des->bSlaveInterface0 = intf_data->bInterfaceNumber; - } else if (cs_des->bDescriptorSubType == USB_CDC_ETHERNET_TYPE) { - struct usb_cdc_ether_desc *ether_des = (struct usb_cdc_ether_desc *)des_head; - ether_des->iMACAddress = intf_ctl->iInterface + 1; - } - } - } - /* And we're done */ - ffs->eps = func->eps; - ffs_event_add(ffs, FUNCTIONFS_BIND); - return 0; - -error: - /* XXX Do we need to release all claimed endpoints here? */ - return ret; -} - -static int ffs_func_bind(struct usb_configuration *c, struct usb_function *f) -{ - struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c); - struct ffs_function *func = ffs_func_from_usb(f); - int ret; - - if (IS_ERR(ffs_opts)) - return PTR_ERR(ffs_opts); - - ret = _ffs_func_bind(c, f); - if (ret && !--ffs_opts->refcnt) - functionfs_unbind(func->ffs); - - return ret; -} - -/* Other USB function hooks *************************************************/ -static void ffs_reset_work(struct work_struct *work) -{ - struct ffs_data *ffs = container_of(work, - struct ffs_data, reset_work); - ffs_data_reset(ffs); -} - -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_DEACTIVATED) { - ffs->state = FFS_CLOSING; - INIT_WORK(&ffs->reset_work, ffs_reset_work); - schedule_work(&ffs->reset_work); - return -ENODEV; - } - - 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). Other request recipient - * types are only handled when the user flag FUNCTIONFS_ALL_CTRL_RECIP - * is being used. - */ - 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; - if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) - ret = func->ffs->eps_addrmap[ret]; - break; - - default: - if (func->ffs->user_flags & FUNCTIONFS_ALL_CTRL_RECIP) - ret = le16_to_cpu(creq->wIndex); - else - 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 creq->wLength == 0 ? USB_GADGET_DELAYED_STATUS : 0; -} - -static bool ffs_func_req_match(struct usb_function *f, - const struct usb_ctrlrequest *creq, - bool config0) -{ - struct ffs_function *func = ffs_func_from_usb(f); - - if (config0 && !(func->ffs->user_flags & FUNCTIONFS_CONFIG0_SETUP)) - return false; - - switch (creq->bRequestType & USB_RECIP_MASK) { - case USB_RECIP_INTERFACE: - return (ffs_func_revmap_intf(func, - le16_to_cpu(creq->wIndex)) >= 0); - case USB_RECIP_ENDPOINT: - return (ffs_func_revmap_ep(func, - le16_to_cpu(creq->wIndex)) >= 0); - default: - return (bool) (func->ffs->user_flags & - FUNCTIONFS_ALL_CTRL_RECIP); - } -} - -static void ffs_func_suspend(struct usb_function *f) -{ - ENTER(); - ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); -} - -static void ffs_func_resume(struct usb_function *f) -{ - ENTER(); - ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); -} - -/* Endpoint and interface numbers reverse mapping ***************************/ -static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) -{ - num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; - return num ? num : -EDOM; -} - -static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) -{ - short *nums = func->interfaces_nums; - unsigned count = func->ffs->interfaces_count; - - for (; count; --count, ++nums) { - if (*nums >= 0 && *nums == intf) - return nums - func->interfaces_nums; - } - - return -EDOM; -} - -/* Devices management *******************************************************/ -static LIST_HEAD(ffs_devices); - -static struct ffs_dev *_ffs_do_find_dev(const char *name) -{ - struct ffs_dev *dev = NULL; - - if (!name) - return NULL; - - list_for_each_entry(dev, &ffs_devices, entry) { - if (!dev->name) - return NULL; - if (strcmp(dev->name, name) == 0) - return dev; - } - - return NULL; -} - -/* - * ffs_lock must be taken by the caller of this function - */ -static struct ffs_dev *_ffs_get_single_dev(void) -{ - struct ffs_dev *dev = NULL; - - if (list_is_singular(&ffs_devices)) { - dev = list_first_entry(&ffs_devices, struct ffs_dev, entry); - if (dev->single) - return dev; - } - - return NULL; -} - -/* - * ffs_lock must be taken by the caller of this function - */ -static struct ffs_dev *_ffs_find_dev(const char *name) -{ - struct ffs_dev *dev; - - dev = _ffs_get_single_dev(); - if (dev) - return dev; - - return _ffs_do_find_dev(name); -} - -/* Configfs support *********************************************************/ -static inline struct f_fs_opts *to_ffs_opts(struct config_item *item) -{ - return container_of(to_config_group(item), struct f_fs_opts, - func_inst.group); -} - -static void ffs_attr_release(struct config_item *item) -{ - struct f_fs_opts *opts = to_ffs_opts(item); - - usb_put_function_instance(&opts->func_inst); -} - -static struct configfs_item_operations ffs_item_ops = { - .release = ffs_attr_release, -}; - -static const struct config_item_type ffs_func_type = { - .ct_item_ops = &ffs_item_ops, - .ct_owner = THIS_MODULE, -}; - -/* Function registration interface ******************************************/ -static void ffs_free_inst(struct usb_function_instance *f) -{ - struct f_fs_opts *opts; - - opts = to_f_fs_opts(f); - ffs_dev_lock(); - _ffs_free_dev(opts->dev); - ffs_dev_unlock(); - kfree(opts); -} - -static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name) -{ - char name_dev[MAX_NAMELEN] = {0}; - if (snprintf(name_dev, MAX_NAMELEN - 1, "%s.%s", FUNCTION_GENERIC, name) < 0) { - return -EFAULT; - } - if (strlen(name_dev) >= sizeof_field(struct ffs_dev, name)) - return -ENAMETOOLONG; - return ffs_name_dev_adapter(to_f_fs_opts(fi)->dev, name_dev); -} - -static struct usb_function_instance *ffs_alloc_inst(void) -{ - struct f_fs_opts *opts = NULL; - struct ffs_dev *dev = NULL; - - opts = kzalloc(sizeof(*opts), GFP_KERNEL); - if (!opts) - return ERR_PTR(-ENOMEM); - - opts->func_inst.set_inst_name = ffs_set_inst_name; - opts->func_inst.free_func_inst = ffs_free_inst; - ffs_dev_lock(); - dev = _ffs_alloc_dev(); - ffs_dev_unlock(); - if (IS_ERR(dev)) { - kfree(opts); - return ERR_CAST(dev); - } - opts->dev = dev; - dev->opts = opts; - - config_group_init_type_name(&opts->func_inst.group, "", - &ffs_func_type); - return &opts->func_inst; -} - -static void ffs_free(struct usb_function *f) -{ - kfree(ffs_func_from_usb(f)); -} - -static void ffs_func_unbind(struct usb_configuration *c, - struct usb_function *f) -{ - struct ffs_function *func = ffs_func_from_usb(f); - struct ffs_data *ffs = func->ffs; - struct f_fs_opts *opts = - container_of(f->fi, struct f_fs_opts, func_inst); - struct ffs_ep *ep = func->eps; - unsigned count = ffs->eps_count; - unsigned long flags; - - ENTER(); - if (ffs->func == func) { - ffs_func_eps_disable(func); - ffs->func = NULL; - } - - if (!--opts->refcnt) - functionfs_unbind(ffs); - - /* cleanup after autoconfig */ - spin_lock_irqsave(&func->ffs->eps_lock, flags); - while (count--) { - if (ep->ep && ep->req) - usb_ep_free_request(ep->ep, ep->req); - ep->req = NULL; - ++ep; - } - spin_unlock_irqrestore(&func->ffs->eps_lock, flags); - kfree(func->eps); - func->eps = NULL; - /* - * eps, descriptors and interfaces_nums are allocated in the - * same chunk so only one free is required. - */ - func->function.fs_descriptors = NULL; - func->function.hs_descriptors = NULL; - func->function.ss_descriptors = NULL; - func->interfaces_nums = NULL; - - ffs_event_add(ffs, FUNCTIONFS_UNBIND); -} - -static int ffs_func_get_alt(struct usb_function *f, unsigned intf) -{ - if (intf == 0) - return 0; - return 1; -} - -static struct usb_function *ffs_alloc(struct usb_function_instance *fi) -{ - struct ffs_function *func = NULL; - - ENTER(); - - func = kzalloc(sizeof(*func), GFP_KERNEL); - if (unlikely(!func)) - return ERR_PTR(-ENOMEM); - - func->function.name = "FunctionFS Adapter"; - - func->function.bind = ffs_func_bind; - func->function.unbind = ffs_func_unbind; - func->function.set_alt = ffs_func_set_alt; - func->function.get_alt = ffs_func_get_alt; - func->function.disable = ffs_func_disable; - func->function.setup = ffs_func_setup; - func->function.req_match = ffs_func_req_match; - func->function.suspend = ffs_func_suspend; - func->function.resume = ffs_func_resume; - func->function.free_func = ffs_free; - - return &func->function; -} - -/* - * ffs_lock must be taken by the caller of this function - */ -static struct ffs_dev *_ffs_alloc_dev(void) -{ - struct ffs_dev *dev = NULL; - int ret; - - if (_ffs_get_single_dev()) - return ERR_PTR(-EBUSY); - - dev = kzalloc(sizeof(*dev), GFP_KERNEL); - if (!dev) - return ERR_PTR(-ENOMEM); - - if (list_empty(&ffs_devices)) { - ret = functionfs_init(); - if (ret) { - kfree(dev); - return ERR_PTR(ret); - } - } - - list_add(&dev->entry, &ffs_devices); - - return dev; -} - -int ffs_name_dev_adapter(struct ffs_dev *dev, const char *name) -{ - struct ffs_dev *existing = NULL; - int ret = 0; - - ffs_dev_lock(); - - existing = _ffs_do_find_dev(name); - if (!existing) - strlcpy(dev->name, name, ARRAY_SIZE(dev->name)); - else if (existing != dev) - ret = -EBUSY; - - ffs_dev_unlock(); - - return ret; -} -EXPORT_SYMBOL_GPL(ffs_name_dev_adapter); - -int ffs_single_dev_adapter(struct ffs_dev *dev) -{ - int ret; - - ret = 0; - ffs_dev_lock(); - - if (!list_is_singular(&ffs_devices)) - ret = -EBUSY; - else - dev->single = true; - - ffs_dev_unlock(); - return ret; -} -EXPORT_SYMBOL_GPL(ffs_single_dev_adapter); -/* - * ffs_lock must be taken by the caller of this function - */ -static void _ffs_free_dev(struct ffs_dev *dev) -{ - list_del(&dev->entry); - - /* Clear the private_data pointer to stop incorrect dev access */ - if (dev->ffs_data) - dev->ffs_data->private_data = NULL; - - kfree(dev); - if (list_empty(&ffs_devices)) - functionfs_cleanup(); -} - -static void *ffs_acquire_dev(const char *dev_name) -{ - struct ffs_dev *ffs_dev = NULL; - - ENTER(); - ffs_dev_lock(); - - ffs_dev = _ffs_find_dev(dev_name); - if (!ffs_dev) - ffs_dev = ERR_PTR(-ENOENT); - else if (ffs_dev->mounted) - ffs_dev = ERR_PTR(-EBUSY); - else if (ffs_dev->ffs_acquire_dev_callback && - ffs_dev->ffs_acquire_dev_callback(ffs_dev)) - ffs_dev = ERR_PTR(-ENOENT); - else - ffs_dev->mounted = true; - - ffs_dev_unlock(); - return ffs_dev; -} - -static void ffs_release_dev(struct ffs_data *ffs_data) -{ - struct ffs_dev *ffs_dev = NULL; - - ENTER(); - ffs_dev_lock(); - - ffs_dev = ffs_data->private_data; - if (ffs_dev) { - ffs_dev->mounted = false; - - if (ffs_dev->ffs_release_dev_callback) - ffs_dev->ffs_release_dev_callback(ffs_dev); - } - - ffs_dev_unlock(); -} - -static int ffs_ready(struct ffs_data *ffs) -{ - struct ffs_dev *ffs_obj = NULL; - int ret = 0; - - ENTER(); - ffs_dev_lock(); - - ffs_obj = ffs->private_data; - if (!ffs_obj) { - ret = -EINVAL; - goto done; - } - if (WARN_ON(ffs_obj->desc_ready)) { - ret = -EBUSY; - goto done; - } - - ffs_obj->desc_ready = true; - ffs_obj->ffs_data = ffs; - - if (ffs_obj->ffs_ready_callback) { - ret = ffs_obj->ffs_ready_callback(ffs); - if (ret) - goto done; - } - - set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); -done: - ffs_dev_unlock(); - return ret; -} - -static void ffs_closed(struct ffs_data *ffs) -{ - struct ffs_dev *ffs_obj = NULL; - struct f_fs_opts *opts = NULL; - struct config_item *ci = NULL; - - ENTER(); - ffs_dev_lock(); - - ffs_obj = ffs->private_data; - if (!ffs_obj) - goto done; - - ffs_obj->desc_ready = false; - ffs_obj->ffs_data = NULL; - - if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags) && - ffs_obj->ffs_closed_callback) - ffs_obj->ffs_closed_callback(ffs); - - if (ffs_obj->opts) - opts = ffs_obj->opts; - else - goto done; - - if (opts->no_configfs || !opts->func_inst.group.cg_item.ci_parent - || !kref_read(&opts->func_inst.group.cg_item.ci_kref)) - goto done; - - ci = opts->func_inst.group.cg_item.ci_parent->ci_parent; - ffs_dev_unlock(); - - if (test_bit(FFS_FL_BOUND, &ffs->flags)) - unregister_gadget_item(ci); - return; -done: - ffs_dev_unlock(); -} - -/* Misc helper functions ****************************************************/ -static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) -{ - return nonblock - ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN - : mutex_lock_interruptible(mutex); -} - -static char *ffs_prepare_buffer(const char __user *buf, size_t len) -{ - char *data = NULL; - - if (unlikely(!len)) - return NULL; - - data = kmalloc(len, GFP_KERNEL); - if (unlikely(!data)) - return ERR_PTR(-ENOMEM); - - if (unlikely(copy_from_user(data, buf, len))) { - kfree(data); - return ERR_PTR(-EFAULT); - } - - pr_vdebug("Buffer from user space:\n"); - ffs_dump_mem("", data, len); - - return data; -} - -DECLARE_USB_FUNCTION_INIT(f_generic, ffs_alloc_inst, ffs_alloc); -MODULE_LICENSE("GPL"); diff --git a/drivers/usb/gadget/function/f_generic.c b/drivers/usb/gadget/function/f_generic.c new file mode 120000 index 000000000000..cb74cee217d0 --- /dev/null +++ b/drivers/usb/gadget/function/f_generic.c @@ -0,0 +1 @@ +../../../../../../../drivers/peripheral/usb/gadget/function/usbfn/f_generic.c \ No newline at end of file -- Gitee