it's not used anymore by anyone, we can remove it.
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
---
drivers/usb/gadget/inode.c | 2129 --------------------------------------------
1 file changed, 2129 deletions(-)
delete mode 100644 drivers/usb/gadget/inode.c
diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
deleted file mode 100644
index 8ac840f..0000000
--- a/drivers/usb/gadget/inode.c
+++ /dev/null
@@ -1,2129 +0,0 @@
-/*
- * inode.c -- user mode filesystem api for usb gadget controllers
- *
- * Copyright (C) 2003-2004 David Brownell
- * Copyright (C) 2003 Agilent Technologies
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-
-/* #define VERBOSE_DEBUG */
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/pagemap.h>
-#include <linux/uts.h>
-#include <linux/wait.h>
-#include <linux/compiler.h>
-#include <asm/uaccess.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/poll.h>
-
-#include <linux/device.h>
-#include <linux/moduleparam.h>
-
-#include <linux/usb/gadgetfs.h>
-#include <linux/usb/gadget.h>
-
-
-/*
- * The gadgetfs API maps each endpoint to a file descriptor so that you
- * can use standard synchronous read/write calls for I/O. There's some
- * O_NONBLOCK and O_ASYNC/FASYNC style i/o support. Example usermode
- * drivers show how this works in practice. You can also use AIO to
- * eliminate I/O gaps between requests, to help when streaming data.
- *
- * Key parts that must be USB-specific are protocols defining how the
- * read/write operations relate to the hardware state machines. There
- * are two types of files. One type is for the device, implementing ep0.
- * The other type is for each IN or OUT endpoint. In both cases, the
- * user mode driver must configure the hardware before using it.
- *
- * - First, dev_config() is called when /dev/gadget/$CHIP is configured
- * (by writing configuration and device descriptors). Afterwards it
- * may serve as a source of device events, used to handle all control
- * requests other than basic enumeration.
- *
- * - Then, after a SET_CONFIGURATION control request, ep_config() is
- * called when each /dev/gadget/ep* file is configured (by writing
- * endpoint descriptors). Afterwards these files are used to write()
- * IN data or to read() OUT data. To halt the endpoint, a "wrong
- * direction" request is issued (like reading an IN endpoint).
- *
- * Unlike "usbfs" the only ioctl()s are for things that are rare, and maybe
- * not possible on all hardware. For example, precise fault handling with
- * respect to data left in endpoint fifos after aborted operations; or
- * selective clearing of endpoint halts, to implement SET_INTERFACE.
- */
-
-#define DRIVER_DESC "USB Gadget filesystem"
-#define DRIVER_VERSION "24 Aug 2004"
-
-static const char driver_desc [] = DRIVER_DESC;
-static const char shortname [] = "gadgetfs";
-
-MODULE_DESCRIPTION (DRIVER_DESC);
-MODULE_AUTHOR ("David Brownell");
-MODULE_LICENSE ("GPL");
-
-
-/*----------------------------------------------------------------------*/
-
-#define GADGETFS_MAGIC 0xaee71ee7
-
-/* /dev/gadget/$CHIP represents ep0 and the whole device */
-enum ep0_state {
- /* DISBLED is the initial state.
- */
- STATE_DEV_DISABLED = 0,
-
- /* Only one open() of /dev/gadget/$CHIP; only one file tracks
- * ep0/device i/o modes and binding to the controller. Driver
- * must always write descriptors to initialize the device, then
- * the device becomes UNCONNECTED until enumeration.
- */
- STATE_DEV_OPENED,
-
- /* From then on, ep0 fd is in either of two basic modes:
- * - (UN)CONNECTED: read usb_gadgetfs_event(s) from it
- * - SETUP: read/write will transfer control data and succeed;
- * or if "wrong direction", performs protocol stall
- */
- STATE_DEV_UNCONNECTED,
- STATE_DEV_CONNECTED,
- STATE_DEV_SETUP,
-
- /* UNBOUND means the driver closed ep0, so the device won't be
- * accessible again (DEV_DISABLED) until all fds are closed.
- */
- STATE_DEV_UNBOUND,
-};
-
-/* enough for the whole queue: most events invalidate others */
-#define N_EVENT 5
-
-struct dev_data {
- spinlock_t lock;
- atomic_t count;
- enum ep0_state state; /* P: lock */
- struct usb_gadgetfs_event event [N_EVENT];
- unsigned ev_next;
- struct fasync_struct *fasync;
- u8 current_config;
-
- /* drivers reading ep0 MUST handle control requests (SETUP)
- * reported that way; else the host will time out.
- */
- unsigned usermode_setup : 1,
- setup_in : 1,
- setup_can_stall : 1,
- setup_out_ready : 1,
- setup_out_error : 1,
- setup_abort : 1;
- unsigned setup_wLength;
-
- /* the rest is basically write-once */
- struct usb_config_descriptor *config, *hs_config;
- struct usb_device_descriptor *dev;
- struct usb_request *req;
- struct usb_gadget *gadget;
- struct list_head epfiles;
- void *buf;
- wait_queue_head_t wait;
- struct super_block *sb;
- struct dentry *dentry;
-
- /* except this scratch i/o buffer for ep0 */
- u8 rbuf [256];
-};
-
-static inline void get_dev (struct dev_data *data)
-{
- atomic_inc (&data->count);
-}
-
-static void put_dev (struct dev_data *data)
-{
- if (likely (!atomic_dec_and_test (&data->count)))
- return;
- /* needs no more cleanup */
- BUG_ON (waitqueue_active (&data->wait));
- kfree (data);
-}
-
-static struct dev_data *dev_new (void)
-{
- struct dev_data *dev;
-
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev)
- return NULL;
- dev->state = STATE_DEV_DISABLED;
- atomic_set (&dev->count, 1);
- spin_lock_init (&dev->lock);
- INIT_LIST_HEAD (&dev->epfiles);
- init_waitqueue_head (&dev->wait);
- return dev;
-}
-
-/*----------------------------------------------------------------------*/
-
-/* other /dev/gadget/$ENDPOINT files represent endpoints */
-enum ep_state {
- STATE_EP_DISABLED = 0,
- STATE_EP_READY,
- STATE_EP_ENABLED,
- STATE_EP_UNBOUND,
-};
-
-struct ep_data {
- struct mutex lock;
- enum ep_state state;
- atomic_t count;
- struct dev_data *dev;
- /* must hold dev->lock before accessing ep or req */
- struct usb_ep *ep;
- struct usb_request *req;
- ssize_t status;
- char name [16];
- struct usb_endpoint_descriptor desc, hs_desc;
- struct list_head epfiles;
- wait_queue_head_t wait;
- struct dentry *dentry;
- struct inode *inode;
-};
-
-static inline void get_ep (struct ep_data *data)
-{
- atomic_inc (&data->count);
-}
-
-static void put_ep (struct ep_data *data)
-{
- if (likely (!atomic_dec_and_test (&data->count)))
- return;
- put_dev (data->dev);
- /* needs no more cleanup */
- BUG_ON (!list_empty (&data->epfiles));
- BUG_ON (waitqueue_active (&data->wait));
- kfree (data);
-}
-
-/*----------------------------------------------------------------------*/
-
-/* most "how to use the hardware" policy choices are in userspace:
- * mapping endpoint roles (which the driver needs) to the capabilities
- * which the usb controller has. most of those capabilities are exposed
- * implicitly, starting with the driver name and then endpoint names.
- */
-
-static const char *CHIP;
-
-/*----------------------------------------------------------------------*/
-
-/* NOTE: don't use dev_printk calls before binding to the gadget
- * at the end of ep0 configuration, or after unbind.
- */
-
-/* too wordy: dev_printk(level , &(d)->gadget->dev , fmt , ## args) */
-#define xprintk(d,level,fmt,args...) \
- printk(level "%s: " fmt , shortname , ## args)
-
-#ifdef DEBUG
-#define DBG(dev,fmt,args...) \
- xprintk(dev , KERN_DEBUG , fmt , ## args)
-#else
-#define DBG(dev,fmt,args...) \
- do { } while (0)
-#endif /* DEBUG */
-
-#ifdef VERBOSE_DEBUG
-#define VDEBUG DBG
-#else
-#define VDEBUG(dev,fmt,args...) \
- do { } while (0)
-#endif /* DEBUG */
-
-#define ERROR(dev,fmt,args...) \
- xprintk(dev , KERN_ERR , fmt , ## args)
-#define INFO(dev,fmt,args...) \
- xprintk(dev , KERN_INFO , fmt , ## args)
-
-
-/*----------------------------------------------------------------------*/
-
-/* SYNCHRONOUS ENDPOINT OPERATIONS (bulk/intr/iso)
- *
- * After opening, configure non-control endpoints. Then use normal
- * stream read() and write() requests; and maybe ioctl() to get more
- * precise FIFO status when recovering from cancellation.
- */
-
-static void epio_complete (struct usb_ep *ep, struct usb_request *req)
-{
- struct ep_data *epdata = ep->driver_data;
-
- if (!req->context)
- return;
- if (req->status)
- epdata->status = req->status;
- else
- epdata->status = req->actual;
- complete ((struct completion *)req->context);
-}
-
-/* tasklock endpoint, returning when it's connected.
- * still need dev->lock to use epdata->ep.
- */
-static int
-get_ready_ep (unsigned f_flags, struct ep_data *epdata)
-{
- int val;
-
- if (f_flags & O_NONBLOCK) {
- if (!mutex_trylock(&epdata->lock))
- goto nonblock;
- if (epdata->state != STATE_EP_ENABLED) {
- mutex_unlock(&epdata->lock);
-nonblock:
- val = -EAGAIN;
- } else
- val = 0;
- return val;
- }
-
- val = mutex_lock_interruptible(&epdata->lock);
- if (val < 0)
- return val;
-
- switch (epdata->state) {
- case STATE_EP_ENABLED:
- break;
- // case STATE_EP_DISABLED: /* "can't happen" */
- // case STATE_EP_READY: /* "can't happen" */
- default: /* error! */
- pr_debug ("%s: ep %p not available, state %d\n",
- shortname, epdata, epdata->state);
- // FALLTHROUGH
- case STATE_EP_UNBOUND: /* clean disconnect */
- val = -ENODEV;
- mutex_unlock(&epdata->lock);
- }
- return val;
-}
-
-static ssize_t
-ep_io (struct ep_data *epdata, void *buf, unsigned len)
-{
- DECLARE_COMPLETION_ONSTACK (done);
- int value;
-
- spin_lock_irq (&epdata->dev->lock);
- if (likely (epdata->ep != NULL)) {
- struct usb_request *req = epdata->req;
-
- req->context = &done;
- req->complete = epio_complete;
- req->buf = buf;
- req->length = len;
- value = usb_ep_queue (epdata->ep, req, GFP_ATOMIC);
- } else
- value = -ENODEV;
- spin_unlock_irq (&epdata->dev->lock);
-
- if (likely (value == 0)) {
- value = wait_event_interruptible (done.wait, done.done);
- if (value != 0) {
- spin_lock_irq (&epdata->dev->lock);
- if (likely (epdata->ep != NULL)) {
- DBG (epdata->dev, "%s i/o interrupted\n",
- epdata->name);
- usb_ep_dequeue (epdata->ep, epdata->req);
- spin_unlock_irq (&epdata->dev->lock);
-
- wait_event (done.wait, done.done);
- if (epdata->status == -ECONNRESET)
- epdata->status = -EINTR;
- } else {
- spin_unlock_irq (&epdata->dev->lock);
-
- DBG (epdata->dev, "endpoint gone\n");
- epdata->status = -ENODEV;
- }
- }
- return epdata->status;
- }
- return value;
-}
-
-
-/* handle a synchronous OUT bulk/intr/iso transfer */
-static ssize_t
-ep_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
-{
- struct ep_data *data = fd->private_data;
- void *kbuf;
- ssize_t value;
-
- if ((value = get_ready_ep (fd->f_flags, data)) < 0)
- return value;
-
- /* halt any endpoint by doing a "wrong direction" i/o call */
- if (usb_endpoint_dir_in(&data->desc)) {
- if (usb_endpoint_xfer_isoc(&data->desc)) {
- mutex_unlock(&data->lock);
- return -EINVAL;
- }
- DBG (data->dev, "%s halt\n", data->name);
- spin_lock_irq (&data->dev->lock);
- if (likely (data->ep != NULL))
- usb_ep_set_halt (data->ep);
- spin_unlock_irq (&data->dev->lock);
- mutex_unlock(&data->lock);
- return -EBADMSG;
- }
-
- /* FIXME readahead for O_NONBLOCK and poll(); careful with ZLPs */
-
- value = -ENOMEM;
- kbuf = kmalloc (len, GFP_KERNEL);
- if (unlikely (!kbuf))
- goto free1;
-
- value = ep_io (data, kbuf, len);
- VDEBUG (data->dev, "%s read %zu OUT, status %d\n",
- data->name, len, (int) value);
- if (value >= 0 && copy_to_user (buf, kbuf, value))
- value = -EFAULT;
-
-free1:
- mutex_unlock(&data->lock);
- kfree (kbuf);
- return value;
-}
-
-/* handle a synchronous IN bulk/intr/iso transfer */
-static ssize_t
-ep_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
-{
- struct ep_data *data = fd->private_data;
- void *kbuf;
- ssize_t value;
-
- if ((value = get_ready_ep (fd->f_flags, data)) < 0)
- return value;
-
- /* halt any endpoint by doing a "wrong direction" i/o call */
- if (!usb_endpoint_dir_in(&data->desc)) {
- if (usb_endpoint_xfer_isoc(&data->desc)) {
- mutex_unlock(&data->lock);
- return -EINVAL;
- }
- DBG (data->dev, "%s halt\n", data->name);
- spin_lock_irq (&data->dev->lock);
- if (likely (data->ep != NULL))
- usb_ep_set_halt (data->ep);
- spin_unlock_irq (&data->dev->lock);
- mutex_unlock(&data->lock);
- return -EBADMSG;
- }
-
- /* FIXME writebehind for O_NONBLOCK and poll(), qlen = 1 */
-
- value = -ENOMEM;
- kbuf = kmalloc (len, GFP_KERNEL);
- if (!kbuf)
- goto free1;
- if (copy_from_user (kbuf, buf, len)) {
- value = -EFAULT;
- goto free1;
- }
-
- value = ep_io (data, kbuf, len);
- VDEBUG (data->dev, "%s write %zu IN, status %d\n",
- data->name, len, (int) value);
-free1:
- mutex_unlock(&data->lock);
- kfree (kbuf);
- return value;
-}
-
-static int
-ep_release (struct inode *inode, struct file *fd)
-{
- struct ep_data *data = fd->private_data;
- int value;
-
- value = mutex_lock_interruptible(&data->lock);
- if (value < 0)
- return value;
-
- /* clean up if this can be reopened */
- if (data->state != STATE_EP_UNBOUND) {
- data->state = STATE_EP_DISABLED;
- data->desc.bDescriptorType = 0;
- data->hs_desc.bDescriptorType = 0;
- usb_ep_disable(data->ep);
- }
- mutex_unlock(&data->lock);
- put_ep (data);
- return 0;
-}
-
-static long ep_ioctl(struct file *fd, unsigned code, unsigned long value)
-{
- struct ep_data *data = fd->private_data;
- int status;
-
- if ((status = get_ready_ep (fd->f_flags, data)) < 0)
- return status;
-
- spin_lock_irq (&data->dev->lock);
- if (likely (data->ep != NULL)) {
- switch (code) {
- case GADGETFS_FIFO_STATUS:
- status = usb_ep_fifo_status (data->ep);
- break;
- case GADGETFS_FIFO_FLUSH:
- usb_ep_fifo_flush (data->ep);
- break;
- case GADGETFS_CLEAR_HALT:
- status = usb_ep_clear_halt (data->ep);
- break;
- default:
- status = -ENOTTY;
- }
- } else
- status = -ENODEV;
- spin_unlock_irq (&data->dev->lock);
- mutex_unlock(&data->lock);
- return status;
-}
-
-/*----------------------------------------------------------------------*/
-
-/* ASYNCHRONOUS ENDPOINT I/O OPERATIONS (bulk/intr/iso) */
-
-struct kiocb_priv {
- struct usb_request *req;
- struct ep_data *epdata;
- void *buf;
- const struct iovec *iv;
- unsigned long nr_segs;
- unsigned actual;
-};
-
-static int ep_aio_cancel(struct kiocb *iocb, struct io_event *e)
-{
- struct kiocb_priv *priv = iocb->private;
- struct ep_data *epdata;
- int value;
-
- local_irq_disable();
- epdata = priv->epdata;
- // spin_lock(&epdata->dev->lock);
- kiocbSetCancelled(iocb);
- if (likely(epdata && epdata->ep && priv->req))
- value = usb_ep_dequeue (epdata->ep, priv->req);
- else
- value = -EINVAL;
- // spin_unlock(&epdata->dev->lock);
- local_irq_enable();
-
- aio_put_req(iocb);
- return value;
-}
-
-static ssize_t ep_aio_read_retry(struct kiocb *iocb)
-{
- struct kiocb_priv *priv = iocb->private;
- ssize_t len, total;
- void *to_copy;
- int i;
-
- /* we "retry" to get the right mm context for this: */
-
- /* copy stuff into user buffers */
- total = priv->actual;
- len = 0;
- to_copy = priv->buf;
- for (i=0; i < priv->nr_segs; i++) {
- ssize_t this = min((ssize_t)(priv->iv[i].iov_len), total);
-
- if (copy_to_user(priv->iv[i].iov_base, to_copy, this)) {
- if (len == 0)
- len = -EFAULT;
- break;
- }
-
- total -= this;
- len += this;
- to_copy += this;
- if (total == 0)
- break;
- }
- kfree(priv->buf);
- kfree(priv);
- return len;
-}
-
-static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req)
-{
- struct kiocb *iocb = req->context;
- struct kiocb_priv *priv = iocb->private;
- struct ep_data *epdata = priv->epdata;
-
- /* lock against disconnect (and ideally, cancel) */
- spin_lock(&epdata->dev->lock);
- priv->req = NULL;
- priv->epdata = NULL;
-
- /* if this was a write or a read returning no data then we
- * don't need to copy anything to userspace, so we can
- * complete the aio request immediately.
- */
- if (priv->iv == NULL || unlikely(req->actual == 0)) {
- kfree(req->buf);
- kfree(priv);
- iocb->private = NULL;
- /* aio_complete() reports bytes-transferred _and_ faults */
- aio_complete(iocb, req->actual ? req->actual : req->status,
- req->status);
- } else {
- /* retry() won't report both; so we hide some faults */
- if (unlikely(0 != req->status))
- DBG(epdata->dev, "%s fault %d len %d\n",
- ep->name, req->status, req->actual);
-
- priv->buf = req->buf;
- priv->actual = req->actual;
- kick_iocb(iocb);
- }
- spin_unlock(&epdata->dev->lock);
-
- usb_ep_free_request(ep, req);
- put_ep(epdata);
-}
-
-static ssize_t
-ep_aio_rwtail(
- struct kiocb *iocb,
- char *buf,
- size_t len,
- struct ep_data *epdata,
- const struct iovec *iv,
- unsigned long nr_segs
-)
-{
- struct kiocb_priv *priv;
- struct usb_request *req;
- ssize_t value;
-
- priv = kmalloc(sizeof *priv, GFP_KERNEL);
- if (!priv) {
- value = -ENOMEM;
-fail:
- kfree(buf);
- return value;
- }
- iocb->private = priv;
- priv->iv = iv;
- priv->nr_segs = nr_segs;
-
- value = get_ready_ep(iocb->ki_filp->f_flags, epdata);
- if (unlikely(value < 0)) {
- kfree(priv);
- goto fail;
- }
-
- iocb->ki_cancel = ep_aio_cancel;
- get_ep(epdata);
- priv->epdata = epdata;
- priv->actual = 0;
-
- /* each kiocb is coupled to one usb_request, but we can't
- * allocate or submit those if the host disconnected.
- */
- spin_lock_irq(&epdata->dev->lock);
- if (likely(epdata->ep)) {
- req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC);
- if (likely(req)) {
- priv->req = req;
- req->buf = buf;
- req->length = len;
- req->complete = ep_aio_complete;
- req->context = iocb;
- value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC);
- if (unlikely(0 != value))
- usb_ep_free_request(epdata->ep, req);
- } else
- value = -EAGAIN;
- } else
- value = -ENODEV;
- spin_unlock_irq(&epdata->dev->lock);
-
- mutex_unlock(&epdata->lock);
-
- if (unlikely(value)) {
- kfree(priv);
- put_ep(epdata);
- } else
- value = (iv ? -EIOCBRETRY : -EIOCBQUEUED);
- return value;
-}
-
-static ssize_t
-ep_aio_read(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t o)
-{
- struct ep_data *epdata = iocb->ki_filp->private_data;
- char *buf;
-
- if (unlikely(usb_endpoint_dir_in(&epdata->desc)))
- return -EINVAL;
-
- buf = kmalloc(iocb->ki_left, GFP_KERNEL);
- if (unlikely(!buf))
- return -ENOMEM;
-
- iocb->ki_retry = ep_aio_read_retry;
- return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs);
-}
-
-static ssize_t
-ep_aio_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t o)
-{
- struct ep_data *epdata = iocb->ki_filp->private_data;
- char *buf;
- size_t len = 0;
- int i = 0;
-
- if (unlikely(!usb_endpoint_dir_in(&epdata->desc)))
- return -EINVAL;
-
- buf = kmalloc(iocb->ki_left, GFP_KERNEL);
- if (unlikely(!buf))
- return -ENOMEM;
-
- for (i=0; i < nr_segs; i++) {
- if (unlikely(copy_from_user(&buf[len], iov[i].iov_base,
- iov[i].iov_len) != 0)) {
- kfree(buf);
- return -EFAULT;
- }
- len += iov[i].iov_len;
- }
- return ep_aio_rwtail(iocb, buf, len, epdata, NULL, 0);
-}
-
-/*----------------------------------------------------------------------*/
-
-/* used after endpoint configuration */
-static const struct file_operations ep_io_operations = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
-
- .read = ep_read,
- .write = ep_write,
- .unlocked_ioctl = ep_ioctl,
- .release = ep_release,
-
- .aio_read = ep_aio_read,
- .aio_write = ep_aio_write,
-};
-
-/* ENDPOINT INITIALIZATION
- *
- * fd = open ("/dev/gadget/$ENDPOINT", O_RDWR)
- * status = write (fd, descriptors, sizeof descriptors)
- *
- * That write establishes the endpoint configuration, configuring
- * the controller to process bulk, interrupt, or isochronous transfers
- * at the right maxpacket size, and so on.
- *
- * The descriptors are message type 1, identified by a host order u32
- * at the beginning of what's written. Descriptor order is: full/low
- * speed descriptor, then optional high speed descriptor.
- */
-static ssize_t
-ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
-{
- struct ep_data *data = fd->private_data;
- struct usb_ep *ep;
- u32 tag;
- int value, length = len;
-
- value = mutex_lock_interruptible(&data->lock);
- if (value < 0)
- return value;
-
- if (data->state != STATE_EP_READY) {
- value = -EL2HLT;
- goto fail;
- }
-
- value = len;
- if (len < USB_DT_ENDPOINT_SIZE + 4)
- goto fail0;
-
- /* we might need to change message format someday */
- if (copy_from_user (&tag, buf, 4)) {
- goto fail1;
- }
- if (tag != 1) {
- DBG(data->dev, "config %s, bad tag %d\n", data->name, tag);
- goto fail0;
- }
- buf += 4;
- len -= 4;
-
- /* NOTE: audio endpoint extensions not accepted here;
- * just don't include the extra bytes.
- */
-
- /* full/low speed descriptor, then high speed */
- if (copy_from_user (&data->desc, buf, USB_DT_ENDPOINT_SIZE)) {
- goto fail1;
- }
- if (data->desc.bLength != USB_DT_ENDPOINT_SIZE
- || data->desc.bDescriptorType != USB_DT_ENDPOINT)
- goto fail0;
- if (len != USB_DT_ENDPOINT_SIZE) {
- if (len != 2 * USB_DT_ENDPOINT_SIZE)
- goto fail0;
- if (copy_from_user (&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE,
- USB_DT_ENDPOINT_SIZE)) {
- goto fail1;
- }
- if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE
- || data->hs_desc.bDescriptorType
- != USB_DT_ENDPOINT) {
- DBG(data->dev, "config %s, bad hs length or type\n",
- data->name);
- goto fail0;
- }
- }
-
- spin_lock_irq (&data->dev->lock);
- if (data->dev->state == STATE_DEV_UNBOUND) {
- value = -ENOENT;
- goto gone;
- } else if ((ep = data->ep) == NULL) {
- value = -ENODEV;
- goto gone;
- }
- switch (data->dev->gadget->speed) {
- case USB_SPEED_LOW:
- case USB_SPEED_FULL:
- ep->desc = &data->desc;
- value = usb_ep_enable(ep);
- if (value == 0)
- data->state = STATE_EP_ENABLED;
- break;
- case USB_SPEED_HIGH:
- /* fails if caller didn't provide that descriptor... */
- ep->desc = &data->hs_desc;
- value = usb_ep_enable(ep);
- if (value == 0)
- data->state = STATE_EP_ENABLED;
- break;
- default:
- DBG(data->dev, "unconnected, %s init abandoned\n",
- data->name);
- value = -EINVAL;
- }
- if (value == 0) {
- fd->f_op = &ep_io_operations;
- value = length;
- }
-gone:
- spin_unlock_irq (&data->dev->lock);
- if (value < 0) {
-fail:
- data->desc.bDescriptorType = 0;
- data->hs_desc.bDescriptorType = 0;
- }
- mutex_unlock(&data->lock);
- return value;
-fail0:
- value = -EINVAL;
- goto fail;
-fail1:
- value = -EFAULT;
- goto fail;
-}
-
-static int
-ep_open (struct inode *inode, struct file *fd)
-{
- struct ep_data *data = inode->i_private;
- int value = -EBUSY;
-
- if (mutex_lock_interruptible(&data->lock) != 0)
- return -EINTR;
- spin_lock_irq (&data->dev->lock);
- if (data->dev->state == STATE_DEV_UNBOUND)
- value = -ENOENT;
- else if (data->state == STATE_EP_DISABLED) {
- value = 0;
- data->state = STATE_EP_READY;
- get_ep (data);
- fd->private_data = data;
- VDEBUG (data->dev, "%s ready\n", data->name);
- } else
- DBG (data->dev, "%s state %d\n",
- data->name, data->state);
- spin_unlock_irq (&data->dev->lock);
- mutex_unlock(&data->lock);
- return value;
-}
-
-/* used before endpoint configuration */
-static const struct file_operations ep_config_operations = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
-
- .open = ep_open,
- .write = ep_config,
- .release = ep_release,
-};
-
-/*----------------------------------------------------------------------*/
-
-/* EP0 IMPLEMENTATION can be partly in userspace.
- *
- * Drivers that use this facility receive various events, including
- * control requests the kernel doesn't handle. Drivers that don't
- * use this facility may be too simple-minded for real applications.
- */
-
-static inline void ep0_readable (struct dev_data *dev)
-{
- wake_up (&dev->wait);
- kill_fasync (&dev->fasync, SIGIO, POLL_IN);
-}
-
-static void clean_req (struct usb_ep *ep, struct usb_request *req)
-{
- struct dev_data *dev = ep->driver_data;
-
- if (req->buf != dev->rbuf) {
- kfree(req->buf);
- req->buf = dev->rbuf;
- }
- req->complete = epio_complete;
- dev->setup_out_ready = 0;
-}
-
-static void ep0_complete (struct usb_ep *ep, struct usb_request *req)
-{
- struct dev_data *dev = ep->driver_data;
- unsigned long flags;
- int free = 1;
-
- /* for control OUT, data must still get to userspace */
- spin_lock_irqsave(&dev->lock, flags);
- if (!dev->setup_in) {
- dev->setup_out_error = (req->status != 0);
- if (!dev->setup_out_error)
- free = 0;
- dev->setup_out_ready = 1;
- ep0_readable (dev);
- }
-
- /* clean up as appropriate */
- if (free && req->buf != &dev->rbuf)
- clean_req (ep, req);
- req->complete = epio_complete;
- spin_unlock_irqrestore(&dev->lock, flags);
-}
-
-static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len)
-{
- struct dev_data *dev = ep->driver_data;
-
- if (dev->setup_out_ready) {
- DBG (dev, "ep0 request busy!\n");
- return -EBUSY;
- }
- if (len > sizeof (dev->rbuf))
- req->buf = kmalloc(len, GFP_ATOMIC);
- if (req->buf == NULL) {
- req->buf = dev->rbuf;
- return -ENOMEM;
- }
- req->complete = ep0_complete;
- req->length = len;
- req->zero = 0;
- return 0;
-}
-
-static ssize_t
-ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
-{
- struct dev_data *dev = fd->private_data;
- ssize_t retval;
- enum ep0_state state;
-
- spin_lock_irq (&dev->lock);
-
- /* report fd mode change before acting on it */
- if (dev->setup_abort) {
- dev->setup_abort = 0;
- retval = -EIDRM;
- goto done;
- }
-
- /* control DATA stage */
- if ((state = dev->state) == STATE_DEV_SETUP) {
-
- if (dev->setup_in) { /* stall IN */
- VDEBUG(dev, "ep0in stall\n");
- (void) usb_ep_set_halt (dev->gadget->ep0);
- retval = -EL2HLT;
- dev->state = STATE_DEV_CONNECTED;
-
- } else if (len == 0) { /* ack SET_CONFIGURATION etc */
- struct usb_ep *ep = dev->gadget->ep0;
- struct usb_request *req = dev->req;
-
- if ((retval = setup_req (ep, req, 0)) == 0)
- retval = usb_ep_queue (ep, req, GFP_ATOMIC);
- dev->state = STATE_DEV_CONNECTED;
-
- /* assume that was SET_CONFIGURATION */
- if (dev->current_config) {
- unsigned power;
-
- if (gadget_is_dualspeed(dev->gadget)
- && (dev->gadget->speed
- == USB_SPEED_HIGH))
- power = dev->hs_config->bMaxPower;
- else
- power = dev->config->bMaxPower;
- usb_gadget_vbus_draw(dev->gadget, 2 * power);
- }
-
- } else { /* collect OUT data */
- if ((fd->f_flags & O_NONBLOCK) != 0
- && !dev->setup_out_ready) {
- retval = -EAGAIN;
- goto done;
- }
- spin_unlock_irq (&dev->lock);
- retval = wait_event_interruptible (dev->wait,
- dev->setup_out_ready != 0);
-
- /* FIXME state could change from under us */
- spin_lock_irq (&dev->lock);
- if (retval)
- goto done;
-
- if (dev->state != STATE_DEV_SETUP) {
- retval = -ECANCELED;
- goto done;
- }
- dev->state = STATE_DEV_CONNECTED;
-
- if (dev->setup_out_error)
- retval = -EIO;
- else {
- len = min (len, (size_t)dev->req->actual);
-// FIXME don't call this with the spinlock held ...
- if (copy_to_user (buf, dev->req->buf, len))
- retval = -EFAULT;
- else
- retval = len;
- clean_req (dev->gadget->ep0, dev->req);
- /* NOTE userspace can't yet choose to stall */
- }
- }
- goto done;
- }
-
- /* else normal: return event data */
- if (len < sizeof dev->event [0]) {
- retval = -EINVAL;
- goto done;
- }
- len -= len % sizeof (struct usb_gadgetfs_event);
- dev->usermode_setup = 1;
-
-scan:
- /* return queued events right away */
- if (dev->ev_next != 0) {
- unsigned i, n;
-
- n = len / sizeof (struct usb_gadgetfs_event);
- if (dev->ev_next < n)
- n = dev->ev_next;
-
- /* ep0 i/o has special semantics during STATE_DEV_SETUP */
- for (i = 0; i < n; i++) {
- if (dev->event [i].type == GADGETFS_SETUP) {
- dev->state = STATE_DEV_SETUP;
- n = i + 1;
- break;
- }
- }
- spin_unlock_irq (&dev->lock);
- len = n * sizeof (struct usb_gadgetfs_event);
- if (copy_to_user (buf, &dev->event, len))
- retval = -EFAULT;
- else
- retval = len;
- if (len > 0) {
- /* NOTE this doesn't guard against broken drivers;
- * concurrent ep0 readers may lose events.
- */
- spin_lock_irq (&dev->lock);
- if (dev->ev_next > n) {
- memmove(&dev->event[0], &dev->event[n],
- sizeof (struct usb_gadgetfs_event)
- * (dev->ev_next - n));
- }
- dev->ev_next -= n;
- spin_unlock_irq (&dev->lock);
- }
- return retval;
- }
- if (fd->f_flags & O_NONBLOCK) {
- retval = -EAGAIN;
- goto done;
- }
-
- switch (state) {
- default:
- DBG (dev, "fail %s, state %d\n", __func__, state);
- retval = -ESRCH;
- break;
- case STATE_DEV_UNCONNECTED:
- case STATE_DEV_CONNECTED:
- spin_unlock_irq (&dev->lock);
- DBG (dev, "%s wait\n", __func__);
-
- /* wait for events */
- retval = wait_event_interruptible (dev->wait,
- dev->ev_next != 0);
- if (retval < 0)
- return retval;
- spin_lock_irq (&dev->lock);
- goto scan;
- }
-
-done:
- spin_unlock_irq (&dev->lock);
- return retval;
-}
-
-static struct usb_gadgetfs_event *
-next_event (struct dev_data *dev, enum usb_gadgetfs_event_type type)
-{
- struct usb_gadgetfs_event *event;
- unsigned i;
-
- switch (type) {
- /* these events purge the queue */
- case GADGETFS_DISCONNECT:
- if (dev->state == STATE_DEV_SETUP)
- dev->setup_abort = 1;
- // FALL THROUGH
- case GADGETFS_CONNECT:
- dev->ev_next = 0;
- break;
- case GADGETFS_SETUP: /* previous request timed out */
- case GADGETFS_SUSPEND: /* same effect */
- /* these events can't be repeated */
- for (i = 0; i != dev->ev_next; i++) {
- if (dev->event [i].type != type)
- continue;
- DBG(dev, "discard old event[%d] %d\n", i, type);
- dev->ev_next--;
- if (i == dev->ev_next)
- break;
- /* indices start at zero, for simplicity */
- memmove (&dev->event [i], &dev->event [i + 1],
- sizeof (struct usb_gadgetfs_event)
- * (dev->ev_next - i));
- }
- break;
- default:
- BUG ();
- }
- VDEBUG(dev, "event[%d] = %d\n", dev->ev_next, type);
- event = &dev->event [dev->ev_next++];
- BUG_ON (dev->ev_next > N_EVENT);
- memset (event, 0, sizeof *event);
- event->type = type;
- return event;
-}
-
-static ssize_t
-ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
-{
- struct dev_data *dev = fd->private_data;
- ssize_t retval = -ESRCH;
-
- spin_lock_irq (&dev->lock);
-
- /* report fd mode change before acting on it */
- if (dev->setup_abort) {
- dev->setup_abort = 0;
- retval = -EIDRM;
-
- /* data and/or status stage for control request */
- } else if (dev->state == STATE_DEV_SETUP) {
-
- /* IN DATA+STATUS caller makes len <= wLength */
- if (dev->setup_in) {
- retval = setup_req (dev->gadget->ep0, dev->req, len);
- if (retval == 0) {
- dev->state = STATE_DEV_CONNECTED;
- spin_unlock_irq (&dev->lock);
- if (copy_from_user (dev->req->buf, buf, len))
- retval = -EFAULT;
- else {
- if (len < dev->setup_wLength)
- dev->req->zero = 1;
- retval = usb_ep_queue (
- dev->gadget->ep0, dev->req,
- GFP_KERNEL);
- }
- if (retval < 0) {
- spin_lock_irq (&dev->lock);
- clean_req (dev->gadget->ep0, dev->req);
- spin_unlock_irq (&dev->lock);
- } else
- retval = len;
-
- return retval;
- }
-
- /* can stall some OUT transfers */
- } else if (dev->setup_can_stall) {
- VDEBUG(dev, "ep0out stall\n");
- (void) usb_ep_set_halt (dev->gadget->ep0);
- retval = -EL2HLT;
- dev->state = STATE_DEV_CONNECTED;
- } else {
- DBG(dev, "bogus ep0out stall!\n");
- }
- } else
- DBG (dev, "fail %s, state %d\n", __func__, dev->state);
-
- spin_unlock_irq (&dev->lock);
- return retval;
-}
-
-static int
-ep0_fasync (int f, struct file *fd, int on)
-{
- struct dev_data *dev = fd->private_data;
- // caller must F_SETOWN before signal delivery happens
- VDEBUG (dev, "%s %s\n", __func__, on ? "on" : "off");
- return fasync_helper (f, fd, on, &dev->fasync);
-}
-
-static struct usb_gadget_driver gadgetfs_driver;
-
-static int
-dev_release (struct inode *inode, struct file *fd)
-{
- struct dev_data *dev = fd->private_data;
-
- /* closing ep0 === shutdown all */
-
- usb_gadget_unregister_driver (&gadgetfs_driver);
-
- /* at this point "good" hardware has disconnected the
- * device from USB; the host won't see it any more.
- * alternatively, all host requests will time out.
- */
-
- kfree (dev->buf);
- dev->buf = NULL;
- put_dev (dev);
-
- /* other endpoints were all decoupled from this device */
- spin_lock_irq(&dev->lock);
- dev->state = STATE_DEV_DISABLED;
- spin_unlock_irq(&dev->lock);
- return 0;
-}
-
-static unsigned int
-ep0_poll (struct file *fd, poll_table *wait)
-{
- struct dev_data *dev = fd->private_data;
- int mask = 0;
-
- poll_wait(fd, &dev->wait, wait);
-
- spin_lock_irq (&dev->lock);
-
- /* report fd mode change before acting on it */
- if (dev->setup_abort) {
- dev->setup_abort = 0;
- mask = POLLHUP;
- goto out;
- }
-
- if (dev->state == STATE_DEV_SETUP) {
- if (dev->setup_in || dev->setup_can_stall)
- mask = POLLOUT;
- } else {
- if (dev->ev_next != 0)
- mask = POLLIN;
- }
-out:
- spin_unlock_irq(&dev->lock);
- return mask;
-}
-
-static long dev_ioctl (struct file *fd, unsigned code, unsigned long value)
-{
- struct dev_data *dev = fd->private_data;
- struct usb_gadget *gadget = dev->gadget;
- long ret = -ENOTTY;
-
- if (gadget->ops->ioctl)
- ret = gadget->ops->ioctl (gadget, code, value);
-
- return ret;
-}
-
-/* used after device configuration */
-static const struct file_operations ep0_io_operations = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
-
- .read = ep0_read,
- .write = ep0_write,
- .fasync = ep0_fasync,
- .poll = ep0_poll,
- .unlocked_ioctl = dev_ioctl,
- .release = dev_release,
-};
-
-/*----------------------------------------------------------------------*/
-
-/* The in-kernel gadget driver handles most ep0 issues, in particular
- * enumerating the single configuration (as provided from user space).
- *
- * Unrecognized ep0 requests may be handled in user space.
- */
-
-static void make_qualifier (struct dev_data *dev)
-{
- struct usb_qualifier_descriptor qual;
- struct usb_device_descriptor *desc;
-
- qual.bLength = sizeof qual;
- qual.bDescriptorType = USB_DT_DEVICE_QUALIFIER;
- qual.bcdUSB = cpu_to_le16 (0x0200);
-
- desc = dev->dev;
- qual.bDeviceClass = desc->bDeviceClass;
- qual.bDeviceSubClass = desc->bDeviceSubClass;
- qual.bDeviceProtocol = desc->bDeviceProtocol;
-
- /* assumes ep0 uses the same value for both speeds ... */
- qual.bMaxPacketSize0 = dev->gadget->ep0->maxpacket;
-
- qual.bNumConfigurations = 1;
- qual.bRESERVED = 0;
-
- memcpy (dev->rbuf, &qual, sizeof qual);
-}
-
-static int
-config_buf (struct dev_data *dev, u8 type, unsigned index)
-{
- int len;
- int hs = 0;
-
- /* only one configuration */
- if (index > 0)
- return -EINVAL;
-
- if (gadget_is_dualspeed(dev->gadget)) {
- hs = (dev->gadget->speed == USB_SPEED_HIGH);
- if (type == USB_DT_OTHER_SPEED_CONFIG)
- hs = !hs;
- }
- if (hs) {
- dev->req->buf = dev->hs_config;
- len = le16_to_cpu(dev->hs_config->wTotalLength);
- } else {
- dev->req->buf = dev->config;
- len = le16_to_cpu(dev->config->wTotalLength);
- }
- ((u8 *)dev->req->buf) [1] = type;
- return len;
-}
-
-static int
-gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
-{
- struct dev_data *dev = get_gadget_data (gadget);
- struct usb_request *req = dev->req;
- int value = -EOPNOTSUPP;
- struct usb_gadgetfs_event *event;
- u16 w_value = le16_to_cpu(ctrl->wValue);
- u16 w_length = le16_to_cpu(ctrl->wLength);
-
- spin_lock (&dev->lock);
- dev->setup_abort = 0;
- if (dev->state == STATE_DEV_UNCONNECTED) {
- if (gadget_is_dualspeed(gadget)
- && gadget->speed == USB_SPEED_HIGH
- && dev->hs_config == NULL) {
- spin_unlock(&dev->lock);
- ERROR (dev, "no high speed config??\n");
- return -EINVAL;
- }
-
- dev->state = STATE_DEV_CONNECTED;
-
- INFO (dev, "connected\n");
- event = next_event (dev, GADGETFS_CONNECT);
- event->u.speed = gadget->speed;
- ep0_readable (dev);
-
- /* host may have given up waiting for response. we can miss control
- * requests handled lower down (device/endpoint status and features);
- * then ep0_{read,write} will report the wrong status. controller
- * driver will have aborted pending i/o.
- */
- } else if (dev->state == STATE_DEV_SETUP)
- dev->setup_abort = 1;
-
- req->buf = dev->rbuf;
- req->context = NULL;
- value = -EOPNOTSUPP;
- switch (ctrl->bRequest) {
-
- case USB_REQ_GET_DESCRIPTOR:
- if (ctrl->bRequestType != USB_DIR_IN)
- goto unrecognized;
- switch (w_value >> 8) {
-
- case USB_DT_DEVICE:
- value = min (w_length, (u16) sizeof *dev->dev);
- dev->dev->bMaxPacketSize0 = dev->gadget->ep0->maxpacket;
- req->buf = dev->dev;
- break;
- case USB_DT_DEVICE_QUALIFIER:
- if (!dev->hs_config)
- break;
- value = min (w_length, (u16)
- sizeof (struct usb_qualifier_descriptor));
- make_qualifier (dev);
- break;
- case USB_DT_OTHER_SPEED_CONFIG:
- // FALLTHROUGH
- case USB_DT_CONFIG:
- value = config_buf (dev,
- w_value >> 8,
- w_value & 0xff);
- if (value >= 0)
- value = min (w_length, (u16) value);
- break;
- case USB_DT_STRING:
- goto unrecognized;
-
- default: // all others are errors
- break;
- }
- break;
-
- /* currently one config, two speeds */
- case USB_REQ_SET_CONFIGURATION:
- if (ctrl->bRequestType != 0)
- goto unrecognized;
- if (0 == (u8) w_value) {
- value = 0;
- dev->current_config = 0;
- usb_gadget_vbus_draw(gadget, 8 /* mA */ );
- // user mode expected to disable endpoints
- } else {
- u8 config, power;
-
- if (gadget_is_dualspeed(gadget)
- && gadget->speed == USB_SPEED_HIGH) {
- config = dev->hs_config->bConfigurationValue;
- power = dev->hs_config->bMaxPower;
- } else {
- config = dev->config->bConfigurationValue;
- power = dev->config->bMaxPower;
- }
-
- if (config == (u8) w_value) {
- value = 0;
- dev->current_config = config;
- usb_gadget_vbus_draw(gadget, 2 * power);
- }
- }
-
- /* report SET_CONFIGURATION like any other control request,
- * except that usermode may not stall this. the next
- * request mustn't be allowed start until this finishes:
- * endpoints and threads set up, etc.
- *
- * NOTE: older PXA hardware (before PXA 255: without UDCCFR)
- * has bad/racey automagic that prevents synchronizing here.
- * even kernel mode drivers often miss them.
- */
- if (value == 0) {
- INFO (dev, "configuration #%d\n", dev->current_config);
- if (dev->usermode_setup) {
- dev->setup_can_stall = 0;
- goto delegate;
- }
- }
- break;
-
-#ifndef CONFIG_USB_GADGET_PXA25X
- /* PXA automagically handles this request too */
- case USB_REQ_GET_CONFIGURATION:
- if (ctrl->bRequestType != 0x80)
- goto unrecognized;
- *(u8 *)req->buf = dev->current_config;
- value = min (w_length, (u16) 1);
- break;
-#endif
-
- default:
-unrecognized:
- VDEBUG (dev, "%s req%02x.%02x v%04x i%04x l%d\n",
- dev->usermode_setup ? "delegate" : "fail",
- ctrl->bRequestType, ctrl->bRequest,
- w_value, le16_to_cpu(ctrl->wIndex), w_length);
-
- /* if there's an ep0 reader, don't stall */
- if (dev->usermode_setup) {
- dev->setup_can_stall = 1;
-delegate:
- dev->setup_in = (ctrl->bRequestType & USB_DIR_IN)
- ? 1 : 0;
- dev->setup_wLength = w_length;
- dev->setup_out_ready = 0;
- dev->setup_out_error = 0;
- value = 0;
-
- /* read DATA stage for OUT right away */
- if (unlikely (!dev->setup_in && w_length)) {
- value = setup_req (gadget->ep0, dev->req,
- w_length);
- if (value < 0)
- break;
- value = usb_ep_queue (gadget->ep0, dev->req,
- GFP_ATOMIC);
- if (value < 0) {
- clean_req (gadget->ep0, dev->req);
- break;
- }
-
- /* we can't currently stall these */
- dev->setup_can_stall = 0;
- }
-
- /* state changes when reader collects event */
- event = next_event (dev, GADGETFS_SETUP);
- event->u.setup = *ctrl;
- ep0_readable (dev);
- spin_unlock (&dev->lock);
- return 0;
- }
- }
-
- /* proceed with data transfer and status phases? */
- if (value >= 0 && dev->state != STATE_DEV_SETUP) {
- req->length = value;
- req->zero = value < w_length;
- value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC);
- if (value < 0) {
- DBG (dev, "ep_queue --> %d\n", value);
- req->status = 0;
- }
- }
-
- /* device stalls when value < 0 */
- spin_unlock (&dev->lock);
- return value;
-}
-
-static void destroy_ep_files (struct dev_data *dev)
-{
- DBG (dev, "%s %d\n", __func__, dev->state);
-
- /* dev->state must prevent interference */
- spin_lock_irq (&dev->lock);
- while (!list_empty(&dev->epfiles)) {
- struct ep_data *ep;
- struct inode *parent;
- struct dentry *dentry;
-
- /* break link to FS */
- ep = list_first_entry (&dev->epfiles, struct ep_data, epfiles);
- list_del_init (&ep->epfiles);
- dentry = ep->dentry;
- ep->dentry = NULL;
- parent = dentry->d_parent->d_inode;
-
- /* break link to controller */
- if (ep->state == STATE_EP_ENABLED)
- (void) usb_ep_disable (ep->ep);
- ep->state = STATE_EP_UNBOUND;
- usb_ep_free_request (ep->ep, ep->req);
- ep->ep = NULL;
- wake_up (&ep->wait);
- put_ep (ep);
-
- spin_unlock_irq (&dev->lock);
-
- /* break link to dcache */
- mutex_lock (&parent->i_mutex);
- d_delete (dentry);
- dput (dentry);
- mutex_unlock (&parent->i_mutex);
-
- spin_lock_irq (&dev->lock);
- }
- spin_unlock_irq (&dev->lock);
-}
-
-
-static struct inode *
-gadgetfs_create_file (struct super_block *sb, char const *name,
- void *data, const struct file_operations *fops,
- struct dentry **dentry_p);
-
-static int activate_ep_files (struct dev_data *dev)
-{
- struct usb_ep *ep;
- struct ep_data *data;
-
- gadget_for_each_ep (ep, dev->gadget) {
-
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- goto enomem0;
- data->state = STATE_EP_DISABLED;
- mutex_init(&data->lock);
- init_waitqueue_head (&data->wait);
-
- strncpy (data->name, ep->name, sizeof (data->name) - 1);
- atomic_set (&data->count, 1);
- data->dev = dev;
- get_dev (dev);
-
- data->ep = ep;
- ep->driver_data = data;
-
- data->req = usb_ep_alloc_request (ep, GFP_KERNEL);
- if (!data->req)
- goto enomem1;
-
- data->inode = gadgetfs_create_file (dev->sb, data->name,
- data, &ep_config_operations,
- &data->dentry);
- if (!data->inode)
- goto enomem2;
- list_add_tail (&data->epfiles, &dev->epfiles);
- }
- return 0;
-
-enomem2:
- usb_ep_free_request (ep, data->req);
-enomem1:
- put_dev (dev);
- kfree (data);
-enomem0:
- DBG (dev, "%s enomem\n", __func__);
- destroy_ep_files (dev);
- return -ENOMEM;
-}
-
-static void
-gadgetfs_unbind (struct usb_gadget *gadget)
-{
- struct dev_data *dev = get_gadget_data (gadget);
-
- DBG (dev, "%s\n", __func__);
-
- spin_lock_irq (&dev->lock);
- dev->state = STATE_DEV_UNBOUND;
- spin_unlock_irq (&dev->lock);
-
- destroy_ep_files (dev);
- gadget->ep0->driver_data = NULL;
- set_gadget_data (gadget, NULL);
-
- /* we've already been disconnected ... no i/o is active */
- if (dev->req)
- usb_ep_free_request (gadget->ep0, dev->req);
- DBG (dev, "%s done\n", __func__);
- put_dev (dev);
-}
-
-static struct dev_data *the_device;
-
-static int gadgetfs_bind(struct usb_gadget *gadget,
- struct usb_gadget_driver *driver)
-{
- struct dev_data *dev = the_device;
-
- if (!dev)
- return -ESRCH;
- if (0 != strcmp (CHIP, gadget->name)) {
- pr_err("%s expected %s controller not %s\n",
- shortname, CHIP, gadget->name);
- return -ENODEV;
- }
-
- set_gadget_data (gadget, dev);
- dev->gadget = gadget;
- gadget->ep0->driver_data = dev;
-
- /* preallocate control response and buffer */
- dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL);
- if (!dev->req)
- goto enomem;
- dev->req->context = NULL;
- dev->req->complete = epio_complete;
-
- if (activate_ep_files (dev) < 0)
- goto enomem;
-
- INFO (dev, "bound to %s driver\n", gadget->name);
- spin_lock_irq(&dev->lock);
- dev->state = STATE_DEV_UNCONNECTED;
- spin_unlock_irq(&dev->lock);
- get_dev (dev);
- return 0;
-
-enomem:
- gadgetfs_unbind (gadget);
- return -ENOMEM;
-}
-
-static void
-gadgetfs_disconnect (struct usb_gadget *gadget)
-{
- struct dev_data *dev = get_gadget_data (gadget);
- unsigned long flags;
-
- spin_lock_irqsave (&dev->lock, flags);
- if (dev->state == STATE_DEV_UNCONNECTED)
- goto exit;
- dev->state = STATE_DEV_UNCONNECTED;
-
- INFO (dev, "disconnected\n");
- next_event (dev, GADGETFS_DISCONNECT);
- ep0_readable (dev);
-exit:
- spin_unlock_irqrestore (&dev->lock, flags);
-}
-
-static void
-gadgetfs_suspend (struct usb_gadget *gadget)
-{
- struct dev_data *dev = get_gadget_data (gadget);
-
- INFO (dev, "suspended from state %d\n", dev->state);
- spin_lock (&dev->lock);
- switch (dev->state) {
- case STATE_DEV_SETUP: // VERY odd... host died??
- case STATE_DEV_CONNECTED:
- case STATE_DEV_UNCONNECTED:
- next_event (dev, GADGETFS_SUSPEND);
- ep0_readable (dev);
- /* FALLTHROUGH */
- default:
- break;
- }
- spin_unlock (&dev->lock);
-}
-
-static struct usb_gadget_driver gadgetfs_driver = {
- .function = (char *) driver_desc,
- .bind = gadgetfs_bind,
- .unbind = gadgetfs_unbind,
- .setup = gadgetfs_setup,
- .disconnect = gadgetfs_disconnect,
- .suspend = gadgetfs_suspend,
-
- .driver = {
- .name = (char *) shortname,
- },
-};
-
-/*----------------------------------------------------------------------*/
-
-static void gadgetfs_nop(struct usb_gadget *arg) { }
-
-static int gadgetfs_probe(struct usb_gadget *gadget,
- struct usb_gadget_driver *driver)
-{
- CHIP = gadget->name;
- return -EISNAM;
-}
-
-static struct usb_gadget_driver probe_driver = {
- .max_speed = USB_SPEED_HIGH,
- .bind = gadgetfs_probe,
- .unbind = gadgetfs_nop,
- .setup = (void *)gadgetfs_nop,
- .disconnect = gadgetfs_nop,
- .driver = {
- .name = "nop",
- },
-};
-
-
-/* DEVICE INITIALIZATION
- *
- * fd = open ("/dev/gadget/$CHIP", O_RDWR)
- * status = write (fd, descriptors, sizeof descriptors)
- *
- * That write establishes the device configuration, so the kernel can
- * bind to the controller ... guaranteeing it can handle enumeration
- * at all necessary speeds. Descriptor order is:
- *
- * . message tag (u32, host order) ... for now, must be zero; it
- * would change to support features like multi-config devices
- * . full/low speed config ... all wTotalLength bytes (with interface,
- * class, altsetting, endpoint, and other descriptors)
- * . high speed config ... all descriptors, for high speed operation;
- * this one's optional except for high-speed hardware
- * . device descriptor
- *
- * Endpoints are not yet enabled. Drivers must wait until device
- * configuration and interface altsetting changes create
- * the need to configure (or unconfigure) them.
- *
- * After initialization, the device stays active for as long as that
- * $CHIP file is open. Events must then be read from that descriptor,
- * such as configuration notifications.
- */
-
-static int is_valid_config (struct usb_config_descriptor *config)
-{
- return config->bDescriptorType == USB_DT_CONFIG
- && config->bLength == USB_DT_CONFIG_SIZE
- && config->bConfigurationValue != 0
- && (config->bmAttributes & USB_CONFIG_ATT_ONE) != 0
- && (config->bmAttributes & USB_CONFIG_ATT_WAKEUP) == 0;
- /* FIXME if gadget->is_otg, _must_ include an otg descriptor */
- /* FIXME check lengths: walk to end */
-}
-
-static ssize_t
-dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
-{
- struct dev_data *dev = fd->private_data;
- ssize_t value = len, length = len;
- unsigned total;
- u32 tag;
- char *kbuf;
-
- if (len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4))
- return -EINVAL;
-
- /* we might need to change message format someday */
- if (copy_from_user (&tag, buf, 4))
- return -EFAULT;
- if (tag != 0)
- return -EINVAL;
- buf += 4;
- length -= 4;
-
- kbuf = memdup_user(buf, length);
- if (IS_ERR(kbuf))
- return PTR_ERR(kbuf);
-
- spin_lock_irq (&dev->lock);
- value = -EINVAL;
- if (dev->buf)
- goto fail;
- dev->buf = kbuf;
-
- /* full or low speed config */
- dev->config = (void *) kbuf;
- total = le16_to_cpu(dev->config->wTotalLength);
- if (!is_valid_config (dev->config) || total >= length)
- goto fail;
- kbuf += total;
- length -= total;
-
- /* optional high speed config */
- if (kbuf [1] == USB_DT_CONFIG) {
- dev->hs_config = (void *) kbuf;
- total = le16_to_cpu(dev->hs_config->wTotalLength);
- if (!is_valid_config (dev->hs_config) || total >= length)
- goto fail;
- kbuf += total;
- length -= total;
- }
-
- /* could support multiple configs, using another encoding! */
-
- /* device descriptor (tweaked for paranoia) */
- if (length != USB_DT_DEVICE_SIZE)
- goto fail;
- dev->dev = (void *)kbuf;
- if (dev->dev->bLength != USB_DT_DEVICE_SIZE
- || dev->dev->bDescriptorType != USB_DT_DEVICE
- || dev->dev->bNumConfigurations != 1)
- goto fail;
- dev->dev->bNumConfigurations = 1;
- dev->dev->bcdUSB = cpu_to_le16 (0x0200);
-
- /* triggers gadgetfs_bind(); then we can enumerate. */
- spin_unlock_irq (&dev->lock);
- if (dev->hs_config)
- gadgetfs_driver.max_speed = USB_SPEED_HIGH;
- else
- gadgetfs_driver.max_speed = USB_SPEED_FULL;
-
- value = usb_gadget_probe_driver(&gadgetfs_driver);
- if (value != 0) {
- kfree (dev->buf);
- dev->buf = NULL;
- } else {
- /* at this point "good" hardware has for the first time
- * let the USB the host see us. alternatively, if users
- * unplug/replug that will clear all the error state.
- *
- * note: everything running before here was guaranteed
- * to choke driver model style diagnostics. from here
- * on, they can work ... except in cleanup paths that
- * kick in after the ep0 descriptor is closed.
- */
- fd->f_op = &ep0_io_operations;
- value = len;
- }
- return value;
-
-fail:
- spin_unlock_irq (&dev->lock);
- pr_debug ("%s: %s fail %Zd, %p\n", shortname, __func__, value, dev);
- kfree (dev->buf);
- dev->buf = NULL;
- return value;
-}
-
-static int
-dev_open (struct inode *inode, struct file *fd)
-{
- struct dev_data *dev = inode->i_private;
- int value = -EBUSY;
-
- spin_lock_irq(&dev->lock);
- if (dev->state == STATE_DEV_DISABLED) {
- dev->ev_next = 0;
- dev->state = STATE_DEV_OPENED;
- fd->private_data = dev;
- get_dev (dev);
- value = 0;
- }
- spin_unlock_irq(&dev->lock);
- return value;
-}
-
-static const struct file_operations dev_init_operations = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
-
- .open = dev_open,
- .write = dev_config,
- .fasync = ep0_fasync,
- .unlocked_ioctl = dev_ioctl,
- .release = dev_release,
-};
-
-/*----------------------------------------------------------------------*/
-
-/* FILESYSTEM AND SUPERBLOCK OPERATIONS
- *
- * Mounting the filesystem creates a controller file, used first for
- * device configuration then later for event monitoring.
- */
-
-
-/* FIXME PAM etc could set this security policy without mount options
- * if epfiles inherited ownership and permissons from ep0 ...
- */
-
-static unsigned default_uid;
-static unsigned default_gid;
-static unsigned default_perm = S_IRUSR | S_IWUSR;
-
-module_param (default_uid, uint, 0644);
-module_param (default_gid, uint, 0644);
-module_param (default_perm, uint, 0644);
-
-
-static struct inode *
-gadgetfs_make_inode (struct super_block *sb,
- void *data, const struct file_operations *fops,
- int mode)
-{
- struct inode *inode = new_inode (sb);
-
- if (inode) {
- inode->i_ino = get_next_ino();
- inode->i_mode = mode;
- inode->i_uid = make_kuid(&init_user_ns, default_uid);
- inode->i_gid = make_kgid(&init_user_ns, default_gid);
- inode->i_atime = inode->i_mtime = inode->i_ctime
- = CURRENT_TIME;
- inode->i_private = data;
- inode->i_fop = fops;
- }
- return inode;
-}
-
-/* creates in fs root directory, so non-renamable and non-linkable.
- * so inode and dentry are paired, until device reconfig.
- */
-static struct inode *
-gadgetfs_create_file (struct super_block *sb, char const *name,
- void *data, const struct file_operations *fops,
- struct dentry **dentry_p)
-{
- struct dentry *dentry;
- struct inode *inode;
-
- dentry = d_alloc_name(sb->s_root, name);
- if (!dentry)
- return NULL;
-
- inode = gadgetfs_make_inode (sb, data, fops,
- S_IFREG | (default_perm & S_IRWXUGO));
- if (!inode) {
- dput(dentry);
- return NULL;
- }
- d_add (dentry, inode);
- *dentry_p = dentry;
- return inode;
-}
-
-static const struct super_operations gadget_fs_operations = {
- .statfs = simple_statfs,
- .drop_inode = generic_delete_inode,
-};
-
-static int
-gadgetfs_fill_super (struct super_block *sb, void *opts, int silent)
-{
- struct inode *inode;
- struct dev_data *dev;
-
- if (the_device)
- return -ESRCH;
-
- /* fake probe to determine $CHIP */
- usb_gadget_probe_driver(&probe_driver);
- if (!CHIP)
- return -ENODEV;
-
- /* superblock */
- sb->s_blocksize = PAGE_CACHE_SIZE;
- sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
- sb->s_magic = GADGETFS_MAGIC;
- sb->s_op = &gadget_fs_operations;
- sb->s_time_gran = 1;
-
- /* root inode */
- inode = gadgetfs_make_inode (sb,
- NULL, &simple_dir_operations,
- S_IFDIR | S_IRUGO | S_IXUGO);
- if (!inode)
- goto Enomem;
- inode->i_op = &simple_dir_inode_operations;
- if (!(sb->s_root = d_make_root (inode)))
- goto Enomem;
-
- /* the ep0 file is named after the controller we expect;
- * user mode code can use it for sanity checks, like we do.
- */
- dev = dev_new ();
- if (!dev)
- goto Enomem;
-
- dev->sb = sb;
- if (!gadgetfs_create_file (sb, CHIP,
- dev, &dev_init_operations,
- &dev->dentry)) {
- put_dev(dev);
- goto Enomem;
- }
-
- /* other endpoint files are available after hardware setup,
- * from binding to a controller.
- */
- the_device = dev;
- return 0;
-
-Enomem:
- return -ENOMEM;
-}
-
-/* "mount -t gadgetfs path /dev/gadget" ends up here */
-static struct dentry *
-gadgetfs_mount (struct file_system_type *t, int flags,
- const char *path, void *opts)
-{
- return mount_single (t, flags, opts, gadgetfs_fill_super);
-}
-
-static void
-gadgetfs_kill_sb (struct super_block *sb)
-{
- kill_litter_super (sb);
- if (the_device) {
- put_dev (the_device);
- the_device = NULL;
- }
-}
-
-/*----------------------------------------------------------------------*/
-
-static struct file_system_type gadgetfs_type = {
- .owner = THIS_MODULE,
- .name = shortname,
- .mount = gadgetfs_mount,
- .kill_sb = gadgetfs_kill_sb,
-};
-
-/*----------------------------------------------------------------------*/
-
-static int __init init (void)
-{
- int status;
-
- status = register_filesystem (&gadgetfs_type);
- if (status == 0)
- pr_info ("%s: %s, version " DRIVER_VERSION "\n",
- shortname, driver_desc);
- return status;
-}
-module_init (init);
-
-static void __exit cleanup (void)
-{
- pr_debug ("unregister %s\n", shortname);
- unregister_filesystem (&gadgetfs_type);
-}
-module_exit (cleanup);
-
--
1.8.1.rc1.5.g7e0651a
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