2 * inode.c -- user mode filesystem api for usb gadget controllers
4 * Copyright (C) 2003-2004 David Brownell
5 * Copyright (C) 2003 Agilent Technologies
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 /* #define VERBOSE_DEBUG */
25 #include <linux/init.h>
26 #include <linux/module.h>
28 #include <linux/pagemap.h>
29 #include <linux/uts.h>
30 #include <linux/wait.h>
31 #include <linux/compiler.h>
32 #include <asm/uaccess.h>
33 #include <linux/slab.h>
34 #include <linux/poll.h>
36 #include <linux/device.h>
37 #include <linux/moduleparam.h>
39 #include <linux/usb/gadgetfs.h>
40 #include <linux/usb/gadget.h>
44 * The gadgetfs API maps each endpoint to a file descriptor so that you
45 * can use standard synchronous read/write calls for I/O. There's some
46 * O_NONBLOCK and O_ASYNC/FASYNC style i/o support. Example usermode
47 * drivers show how this works in practice. You can also use AIO to
48 * eliminate I/O gaps between requests, to help when streaming data.
50 * Key parts that must be USB-specific are protocols defining how the
51 * read/write operations relate to the hardware state machines. There
52 * are two types of files. One type is for the device, implementing ep0.
53 * The other type is for each IN or OUT endpoint. In both cases, the
54 * user mode driver must configure the hardware before using it.
56 * - First, dev_config() is called when /dev/gadget/$CHIP is configured
57 * (by writing configuration and device descriptors). Afterwards it
58 * may serve as a source of device events, used to handle all control
59 * requests other than basic enumeration.
61 * - Then, after a SET_CONFIGURATION control request, ep_config() is
62 * called when each /dev/gadget/ep* file is configured (by writing
63 * endpoint descriptors). Afterwards these files are used to write()
64 * IN data or to read() OUT data. To halt the endpoint, a "wrong
65 * direction" request is issued (like reading an IN endpoint).
67 * Unlike "usbfs" the only ioctl()s are for things that are rare, and maybe
68 * not possible on all hardware. For example, precise fault handling with
69 * respect to data left in endpoint fifos after aborted operations; or
70 * selective clearing of endpoint halts, to implement SET_INTERFACE.
73 #define DRIVER_DESC "USB Gadget filesystem"
74 #define DRIVER_VERSION "24 Aug 2004"
76 static const char driver_desc
[] = DRIVER_DESC
;
77 static const char shortname
[] = "gadgetfs";
79 MODULE_DESCRIPTION (DRIVER_DESC
);
80 MODULE_AUTHOR ("David Brownell");
81 MODULE_LICENSE ("GPL");
84 /*----------------------------------------------------------------------*/
86 #define GADGETFS_MAGIC 0xaee71ee7
87 #define DMA_ADDR_INVALID (~(dma_addr_t)0)
89 /* /dev/gadget/$CHIP represents ep0 and the whole device */
91 /* DISBLED is the initial state.
93 STATE_DEV_DISABLED
= 0,
95 /* Only one open() of /dev/gadget/$CHIP; only one file tracks
96 * ep0/device i/o modes and binding to the controller. Driver
97 * must always write descriptors to initialize the device, then
98 * the device becomes UNCONNECTED until enumeration.
102 /* From then on, ep0 fd is in either of two basic modes:
103 * - (UN)CONNECTED: read usb_gadgetfs_event(s) from it
104 * - SETUP: read/write will transfer control data and succeed;
105 * or if "wrong direction", performs protocol stall
107 STATE_DEV_UNCONNECTED
,
111 /* UNBOUND means the driver closed ep0, so the device won't be
112 * accessible again (DEV_DISABLED) until all fds are closed.
117 /* enough for the whole queue: most events invalidate others */
123 enum ep0_state state
; /* P: lock */
124 struct usb_gadgetfs_event event
[N_EVENT
];
126 struct fasync_struct
*fasync
;
129 /* drivers reading ep0 MUST handle control requests (SETUP)
130 * reported that way; else the host will time out.
132 unsigned usermode_setup
: 1,
138 unsigned setup_wLength
;
140 /* the rest is basically write-once */
141 struct usb_config_descriptor
*config
, *hs_config
;
142 struct usb_device_descriptor
*dev
;
143 struct usb_request
*req
;
144 struct usb_gadget
*gadget
;
145 struct list_head epfiles
;
147 wait_queue_head_t wait
;
148 struct super_block
*sb
;
149 struct dentry
*dentry
;
151 /* except this scratch i/o buffer for ep0 */
155 static inline void get_dev (struct dev_data
*data
)
157 atomic_inc (&data
->count
);
160 static void put_dev (struct dev_data
*data
)
162 if (likely (!atomic_dec_and_test (&data
->count
)))
164 /* needs no more cleanup */
165 BUG_ON (waitqueue_active (&data
->wait
));
169 static struct dev_data
*dev_new (void)
171 struct dev_data
*dev
;
173 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
176 dev
->state
= STATE_DEV_DISABLED
;
177 atomic_set (&dev
->count
, 1);
178 spin_lock_init (&dev
->lock
);
179 INIT_LIST_HEAD (&dev
->epfiles
);
180 init_waitqueue_head (&dev
->wait
);
184 /*----------------------------------------------------------------------*/
186 /* other /dev/gadget/$ENDPOINT files represent endpoints */
188 STATE_EP_DISABLED
= 0,
195 struct semaphore lock
;
198 struct dev_data
*dev
;
199 /* must hold dev->lock before accessing ep or req */
201 struct usb_request
*req
;
204 struct usb_endpoint_descriptor desc
, hs_desc
;
205 struct list_head epfiles
;
206 wait_queue_head_t wait
;
207 struct dentry
*dentry
;
211 static inline void get_ep (struct ep_data
*data
)
213 atomic_inc (&data
->count
);
216 static void put_ep (struct ep_data
*data
)
218 if (likely (!atomic_dec_and_test (&data
->count
)))
221 /* needs no more cleanup */
222 BUG_ON (!list_empty (&data
->epfiles
));
223 BUG_ON (waitqueue_active (&data
->wait
));
227 /*----------------------------------------------------------------------*/
229 /* most "how to use the hardware" policy choices are in userspace:
230 * mapping endpoint roles (which the driver needs) to the capabilities
231 * which the usb controller has. most of those capabilities are exposed
232 * implicitly, starting with the driver name and then endpoint names.
235 static const char *CHIP
;
237 /*----------------------------------------------------------------------*/
239 /* NOTE: don't use dev_printk calls before binding to the gadget
240 * at the end of ep0 configuration, or after unbind.
243 /* too wordy: dev_printk(level , &(d)->gadget->dev , fmt , ## args) */
244 #define xprintk(d,level,fmt,args...) \
245 printk(level "%s: " fmt , shortname , ## args)
248 #define DBG(dev,fmt,args...) \
249 xprintk(dev , KERN_DEBUG , fmt , ## args)
251 #define DBG(dev,fmt,args...) \
258 #define VDEBUG(dev,fmt,args...) \
262 #define ERROR(dev,fmt,args...) \
263 xprintk(dev , KERN_ERR , fmt , ## args)
264 #define WARN(dev,fmt,args...) \
265 xprintk(dev , KERN_WARNING , fmt , ## args)
266 #define INFO(dev,fmt,args...) \
267 xprintk(dev , KERN_INFO , fmt , ## args)
270 /*----------------------------------------------------------------------*/
272 /* SYNCHRONOUS ENDPOINT OPERATIONS (bulk/intr/iso)
274 * After opening, configure non-control endpoints. Then use normal
275 * stream read() and write() requests; and maybe ioctl() to get more
276 * precise FIFO status when recovering from cancellation.
279 static void epio_complete (struct usb_ep
*ep
, struct usb_request
*req
)
281 struct ep_data
*epdata
= ep
->driver_data
;
286 epdata
->status
= req
->status
;
288 epdata
->status
= req
->actual
;
289 complete ((struct completion
*)req
->context
);
292 /* tasklock endpoint, returning when it's connected.
293 * still need dev->lock to use epdata->ep.
296 get_ready_ep (unsigned f_flags
, struct ep_data
*epdata
)
300 if (f_flags
& O_NONBLOCK
) {
301 if (down_trylock (&epdata
->lock
) != 0)
303 if (epdata
->state
!= STATE_EP_ENABLED
) {
312 if ((val
= down_interruptible (&epdata
->lock
)) < 0)
315 switch (epdata
->state
) {
316 case STATE_EP_ENABLED
:
318 // case STATE_EP_DISABLED: /* "can't happen" */
319 // case STATE_EP_READY: /* "can't happen" */
320 default: /* error! */
321 pr_debug ("%s: ep %p not available, state %d\n",
322 shortname
, epdata
, epdata
->state
);
324 case STATE_EP_UNBOUND
: /* clean disconnect */
332 ep_io (struct ep_data
*epdata
, void *buf
, unsigned len
)
334 DECLARE_COMPLETION_ONSTACK (done
);
337 spin_lock_irq (&epdata
->dev
->lock
);
338 if (likely (epdata
->ep
!= NULL
)) {
339 struct usb_request
*req
= epdata
->req
;
341 req
->context
= &done
;
342 req
->complete
= epio_complete
;
345 value
= usb_ep_queue (epdata
->ep
, req
, GFP_ATOMIC
);
348 spin_unlock_irq (&epdata
->dev
->lock
);
350 if (likely (value
== 0)) {
351 value
= wait_event_interruptible (done
.wait
, done
.done
);
353 spin_lock_irq (&epdata
->dev
->lock
);
354 if (likely (epdata
->ep
!= NULL
)) {
355 DBG (epdata
->dev
, "%s i/o interrupted\n",
357 usb_ep_dequeue (epdata
->ep
, epdata
->req
);
358 spin_unlock_irq (&epdata
->dev
->lock
);
360 wait_event (done
.wait
, done
.done
);
361 if (epdata
->status
== -ECONNRESET
)
362 epdata
->status
= -EINTR
;
364 spin_unlock_irq (&epdata
->dev
->lock
);
366 DBG (epdata
->dev
, "endpoint gone\n");
367 epdata
->status
= -ENODEV
;
370 return epdata
->status
;
376 /* handle a synchronous OUT bulk/intr/iso transfer */
378 ep_read (struct file
*fd
, char __user
*buf
, size_t len
, loff_t
*ptr
)
380 struct ep_data
*data
= fd
->private_data
;
384 if ((value
= get_ready_ep (fd
->f_flags
, data
)) < 0)
387 /* halt any endpoint by doing a "wrong direction" i/o call */
388 if (data
->desc
.bEndpointAddress
& USB_DIR_IN
) {
389 if ((data
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
390 == USB_ENDPOINT_XFER_ISOC
)
392 DBG (data
->dev
, "%s halt\n", data
->name
);
393 spin_lock_irq (&data
->dev
->lock
);
394 if (likely (data
->ep
!= NULL
))
395 usb_ep_set_halt (data
->ep
);
396 spin_unlock_irq (&data
->dev
->lock
);
401 /* FIXME readahead for O_NONBLOCK and poll(); careful with ZLPs */
404 kbuf
= kmalloc (len
, GFP_KERNEL
);
405 if (unlikely (!kbuf
))
408 value
= ep_io (data
, kbuf
, len
);
409 VDEBUG (data
->dev
, "%s read %zu OUT, status %d\n",
410 data
->name
, len
, (int) value
);
411 if (value
>= 0 && copy_to_user (buf
, kbuf
, value
))
420 /* handle a synchronous IN bulk/intr/iso transfer */
422 ep_write (struct file
*fd
, const char __user
*buf
, size_t len
, loff_t
*ptr
)
424 struct ep_data
*data
= fd
->private_data
;
428 if ((value
= get_ready_ep (fd
->f_flags
, data
)) < 0)
431 /* halt any endpoint by doing a "wrong direction" i/o call */
432 if (!(data
->desc
.bEndpointAddress
& USB_DIR_IN
)) {
433 if ((data
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
434 == USB_ENDPOINT_XFER_ISOC
)
436 DBG (data
->dev
, "%s halt\n", data
->name
);
437 spin_lock_irq (&data
->dev
->lock
);
438 if (likely (data
->ep
!= NULL
))
439 usb_ep_set_halt (data
->ep
);
440 spin_unlock_irq (&data
->dev
->lock
);
445 /* FIXME writebehind for O_NONBLOCK and poll(), qlen = 1 */
448 kbuf
= kmalloc (len
, GFP_KERNEL
);
451 if (copy_from_user (kbuf
, buf
, len
)) {
456 value
= ep_io (data
, kbuf
, len
);
457 VDEBUG (data
->dev
, "%s write %zu IN, status %d\n",
458 data
->name
, len
, (int) value
);
466 ep_release (struct inode
*inode
, struct file
*fd
)
468 struct ep_data
*data
= fd
->private_data
;
471 if ((value
= down_interruptible(&data
->lock
)) < 0)
474 /* clean up if this can be reopened */
475 if (data
->state
!= STATE_EP_UNBOUND
) {
476 data
->state
= STATE_EP_DISABLED
;
477 data
->desc
.bDescriptorType
= 0;
478 data
->hs_desc
.bDescriptorType
= 0;
479 usb_ep_disable(data
->ep
);
486 static int ep_ioctl (struct inode
*inode
, struct file
*fd
,
487 unsigned code
, unsigned long value
)
489 struct ep_data
*data
= fd
->private_data
;
492 if ((status
= get_ready_ep (fd
->f_flags
, data
)) < 0)
495 spin_lock_irq (&data
->dev
->lock
);
496 if (likely (data
->ep
!= NULL
)) {
498 case GADGETFS_FIFO_STATUS
:
499 status
= usb_ep_fifo_status (data
->ep
);
501 case GADGETFS_FIFO_FLUSH
:
502 usb_ep_fifo_flush (data
->ep
);
504 case GADGETFS_CLEAR_HALT
:
505 status
= usb_ep_clear_halt (data
->ep
);
512 spin_unlock_irq (&data
->dev
->lock
);
517 /*----------------------------------------------------------------------*/
519 /* ASYNCHRONOUS ENDPOINT I/O OPERATIONS (bulk/intr/iso) */
522 struct usb_request
*req
;
523 struct ep_data
*epdata
;
525 const struct iovec
*iv
;
526 unsigned long nr_segs
;
530 static int ep_aio_cancel(struct kiocb
*iocb
, struct io_event
*e
)
532 struct kiocb_priv
*priv
= iocb
->private;
533 struct ep_data
*epdata
;
537 epdata
= priv
->epdata
;
538 // spin_lock(&epdata->dev->lock);
539 kiocbSetCancelled(iocb
);
540 if (likely(epdata
&& epdata
->ep
&& priv
->req
))
541 value
= usb_ep_dequeue (epdata
->ep
, priv
->req
);
544 // spin_unlock(&epdata->dev->lock);
551 static ssize_t
ep_aio_read_retry(struct kiocb
*iocb
)
553 struct kiocb_priv
*priv
= iocb
->private;
558 /* we "retry" to get the right mm context for this: */
560 /* copy stuff into user buffers */
561 total
= priv
->actual
;
564 for (i
=0; i
< priv
->nr_segs
; i
++) {
565 ssize_t
this = min((ssize_t
)(priv
->iv
[i
].iov_len
), total
);
567 if (copy_to_user(priv
->iv
[i
].iov_base
, to_copy
, this)) {
584 static void ep_aio_complete(struct usb_ep
*ep
, struct usb_request
*req
)
586 struct kiocb
*iocb
= req
->context
;
587 struct kiocb_priv
*priv
= iocb
->private;
588 struct ep_data
*epdata
= priv
->epdata
;
590 /* lock against disconnect (and ideally, cancel) */
591 spin_lock(&epdata
->dev
->lock
);
595 /* if this was a write or a read returning no data then we
596 * don't need to copy anything to userspace, so we can
597 * complete the aio request immediately.
599 if (priv
->iv
== NULL
|| unlikely(req
->actual
== 0)) {
602 iocb
->private = NULL
;
603 /* aio_complete() reports bytes-transferred _and_ faults */
604 aio_complete(iocb
, req
->actual
? req
->actual
: req
->status
,
607 /* retry() won't report both; so we hide some faults */
608 if (unlikely(0 != req
->status
))
609 DBG(epdata
->dev
, "%s fault %d len %d\n",
610 ep
->name
, req
->status
, req
->actual
);
612 priv
->buf
= req
->buf
;
613 priv
->actual
= req
->actual
;
616 spin_unlock(&epdata
->dev
->lock
);
618 usb_ep_free_request(ep
, req
);
627 struct ep_data
*epdata
,
628 const struct iovec
*iv
,
629 unsigned long nr_segs
632 struct kiocb_priv
*priv
;
633 struct usb_request
*req
;
636 priv
= kmalloc(sizeof *priv
, GFP_KERNEL
);
643 iocb
->private = priv
;
645 priv
->nr_segs
= nr_segs
;
647 value
= get_ready_ep(iocb
->ki_filp
->f_flags
, epdata
);
648 if (unlikely(value
< 0)) {
653 iocb
->ki_cancel
= ep_aio_cancel
;
655 priv
->epdata
= epdata
;
658 /* each kiocb is coupled to one usb_request, but we can't
659 * allocate or submit those if the host disconnected.
661 spin_lock_irq(&epdata
->dev
->lock
);
662 if (likely(epdata
->ep
)) {
663 req
= usb_ep_alloc_request(epdata
->ep
, GFP_ATOMIC
);
668 req
->complete
= ep_aio_complete
;
670 value
= usb_ep_queue(epdata
->ep
, req
, GFP_ATOMIC
);
671 if (unlikely(0 != value
))
672 usb_ep_free_request(epdata
->ep
, req
);
677 spin_unlock_irq(&epdata
->dev
->lock
);
681 if (unlikely(value
)) {
685 value
= (iv
? -EIOCBRETRY
: -EIOCBQUEUED
);
690 ep_aio_read(struct kiocb
*iocb
, const struct iovec
*iov
,
691 unsigned long nr_segs
, loff_t o
)
693 struct ep_data
*epdata
= iocb
->ki_filp
->private_data
;
696 if (unlikely(epdata
->desc
.bEndpointAddress
& USB_DIR_IN
))
699 buf
= kmalloc(iocb
->ki_left
, GFP_KERNEL
);
703 iocb
->ki_retry
= ep_aio_read_retry
;
704 return ep_aio_rwtail(iocb
, buf
, iocb
->ki_left
, epdata
, iov
, nr_segs
);
708 ep_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
709 unsigned long nr_segs
, loff_t o
)
711 struct ep_data
*epdata
= iocb
->ki_filp
->private_data
;
716 if (unlikely(!(epdata
->desc
.bEndpointAddress
& USB_DIR_IN
)))
719 buf
= kmalloc(iocb
->ki_left
, GFP_KERNEL
);
723 for (i
=0; i
< nr_segs
; i
++) {
724 if (unlikely(copy_from_user(&buf
[len
], iov
[i
].iov_base
,
725 iov
[i
].iov_len
) != 0)) {
729 len
+= iov
[i
].iov_len
;
731 return ep_aio_rwtail(iocb
, buf
, len
, epdata
, NULL
, 0);
734 /*----------------------------------------------------------------------*/
736 /* used after endpoint configuration */
737 static const struct file_operations ep_io_operations
= {
738 .owner
= THIS_MODULE
,
744 .release
= ep_release
,
746 .aio_read
= ep_aio_read
,
747 .aio_write
= ep_aio_write
,
750 /* ENDPOINT INITIALIZATION
752 * fd = open ("/dev/gadget/$ENDPOINT", O_RDWR)
753 * status = write (fd, descriptors, sizeof descriptors)
755 * That write establishes the endpoint configuration, configuring
756 * the controller to process bulk, interrupt, or isochronous transfers
757 * at the right maxpacket size, and so on.
759 * The descriptors are message type 1, identified by a host order u32
760 * at the beginning of what's written. Descriptor order is: full/low
761 * speed descriptor, then optional high speed descriptor.
764 ep_config (struct file
*fd
, const char __user
*buf
, size_t len
, loff_t
*ptr
)
766 struct ep_data
*data
= fd
->private_data
;
769 int value
, length
= len
;
771 if ((value
= down_interruptible (&data
->lock
)) < 0)
774 if (data
->state
!= STATE_EP_READY
) {
780 if (len
< USB_DT_ENDPOINT_SIZE
+ 4)
783 /* we might need to change message format someday */
784 if (copy_from_user (&tag
, buf
, 4)) {
788 DBG(data
->dev
, "config %s, bad tag %d\n", data
->name
, tag
);
794 /* NOTE: audio endpoint extensions not accepted here;
795 * just don't include the extra bytes.
798 /* full/low speed descriptor, then high speed */
799 if (copy_from_user (&data
->desc
, buf
, USB_DT_ENDPOINT_SIZE
)) {
802 if (data
->desc
.bLength
!= USB_DT_ENDPOINT_SIZE
803 || data
->desc
.bDescriptorType
!= USB_DT_ENDPOINT
)
805 if (len
!= USB_DT_ENDPOINT_SIZE
) {
806 if (len
!= 2 * USB_DT_ENDPOINT_SIZE
)
808 if (copy_from_user (&data
->hs_desc
, buf
+ USB_DT_ENDPOINT_SIZE
,
809 USB_DT_ENDPOINT_SIZE
)) {
812 if (data
->hs_desc
.bLength
!= USB_DT_ENDPOINT_SIZE
813 || data
->hs_desc
.bDescriptorType
814 != USB_DT_ENDPOINT
) {
815 DBG(data
->dev
, "config %s, bad hs length or type\n",
821 spin_lock_irq (&data
->dev
->lock
);
822 if (data
->dev
->state
== STATE_DEV_UNBOUND
) {
825 } else if ((ep
= data
->ep
) == NULL
) {
829 switch (data
->dev
->gadget
->speed
) {
832 value
= usb_ep_enable (ep
, &data
->desc
);
834 data
->state
= STATE_EP_ENABLED
;
836 #ifdef CONFIG_USB_GADGET_DUALSPEED
838 /* fails if caller didn't provide that descriptor... */
839 value
= usb_ep_enable (ep
, &data
->hs_desc
);
841 data
->state
= STATE_EP_ENABLED
;
845 DBG(data
->dev
, "unconnected, %s init abandoned\n",
850 fd
->f_op
= &ep_io_operations
;
854 spin_unlock_irq (&data
->dev
->lock
);
857 data
->desc
.bDescriptorType
= 0;
858 data
->hs_desc
.bDescriptorType
= 0;
871 ep_open (struct inode
*inode
, struct file
*fd
)
873 struct ep_data
*data
= inode
->i_private
;
876 if (down_interruptible (&data
->lock
) != 0)
878 spin_lock_irq (&data
->dev
->lock
);
879 if (data
->dev
->state
== STATE_DEV_UNBOUND
)
881 else if (data
->state
== STATE_EP_DISABLED
) {
883 data
->state
= STATE_EP_READY
;
885 fd
->private_data
= data
;
886 VDEBUG (data
->dev
, "%s ready\n", data
->name
);
888 DBG (data
->dev
, "%s state %d\n",
889 data
->name
, data
->state
);
890 spin_unlock_irq (&data
->dev
->lock
);
895 /* used before endpoint configuration */
896 static const struct file_operations ep_config_operations
= {
897 .owner
= THIS_MODULE
,
902 .release
= ep_release
,
905 /*----------------------------------------------------------------------*/
907 /* EP0 IMPLEMENTATION can be partly in userspace.
909 * Drivers that use this facility receive various events, including
910 * control requests the kernel doesn't handle. Drivers that don't
911 * use this facility may be too simple-minded for real applications.
914 static inline void ep0_readable (struct dev_data
*dev
)
916 wake_up (&dev
->wait
);
917 kill_fasync (&dev
->fasync
, SIGIO
, POLL_IN
);
920 static void clean_req (struct usb_ep
*ep
, struct usb_request
*req
)
922 struct dev_data
*dev
= ep
->driver_data
;
924 if (req
->buf
!= dev
->rbuf
) {
926 req
->buf
= dev
->rbuf
;
927 req
->dma
= DMA_ADDR_INVALID
;
929 req
->complete
= epio_complete
;
930 dev
->setup_out_ready
= 0;
933 static void ep0_complete (struct usb_ep
*ep
, struct usb_request
*req
)
935 struct dev_data
*dev
= ep
->driver_data
;
939 /* for control OUT, data must still get to userspace */
940 spin_lock_irqsave(&dev
->lock
, flags
);
941 if (!dev
->setup_in
) {
942 dev
->setup_out_error
= (req
->status
!= 0);
943 if (!dev
->setup_out_error
)
945 dev
->setup_out_ready
= 1;
949 /* clean up as appropriate */
950 if (free
&& req
->buf
!= &dev
->rbuf
)
952 req
->complete
= epio_complete
;
953 spin_unlock_irqrestore(&dev
->lock
, flags
);
956 static int setup_req (struct usb_ep
*ep
, struct usb_request
*req
, u16 len
)
958 struct dev_data
*dev
= ep
->driver_data
;
960 if (dev
->setup_out_ready
) {
961 DBG (dev
, "ep0 request busy!\n");
964 if (len
> sizeof (dev
->rbuf
))
965 req
->buf
= kmalloc(len
, GFP_ATOMIC
);
966 if (req
->buf
== NULL
) {
967 req
->buf
= dev
->rbuf
;
970 req
->complete
= ep0_complete
;
977 ep0_read (struct file
*fd
, char __user
*buf
, size_t len
, loff_t
*ptr
)
979 struct dev_data
*dev
= fd
->private_data
;
981 enum ep0_state state
;
983 spin_lock_irq (&dev
->lock
);
985 /* report fd mode change before acting on it */
986 if (dev
->setup_abort
) {
987 dev
->setup_abort
= 0;
992 /* control DATA stage */
993 if ((state
= dev
->state
) == STATE_DEV_SETUP
) {
995 if (dev
->setup_in
) { /* stall IN */
996 VDEBUG(dev
, "ep0in stall\n");
997 (void) usb_ep_set_halt (dev
->gadget
->ep0
);
999 dev
->state
= STATE_DEV_CONNECTED
;
1001 } else if (len
== 0) { /* ack SET_CONFIGURATION etc */
1002 struct usb_ep
*ep
= dev
->gadget
->ep0
;
1003 struct usb_request
*req
= dev
->req
;
1005 if ((retval
= setup_req (ep
, req
, 0)) == 0)
1006 retval
= usb_ep_queue (ep
, req
, GFP_ATOMIC
);
1007 dev
->state
= STATE_DEV_CONNECTED
;
1009 /* assume that was SET_CONFIGURATION */
1010 if (dev
->current_config
) {
1013 if (gadget_is_dualspeed(dev
->gadget
)
1014 && (dev
->gadget
->speed
1016 power
= dev
->hs_config
->bMaxPower
;
1018 power
= dev
->config
->bMaxPower
;
1019 usb_gadget_vbus_draw(dev
->gadget
, 2 * power
);
1022 } else { /* collect OUT data */
1023 if ((fd
->f_flags
& O_NONBLOCK
) != 0
1024 && !dev
->setup_out_ready
) {
1028 spin_unlock_irq (&dev
->lock
);
1029 retval
= wait_event_interruptible (dev
->wait
,
1030 dev
->setup_out_ready
!= 0);
1032 /* FIXME state could change from under us */
1033 spin_lock_irq (&dev
->lock
);
1037 if (dev
->state
!= STATE_DEV_SETUP
) {
1038 retval
= -ECANCELED
;
1041 dev
->state
= STATE_DEV_CONNECTED
;
1043 if (dev
->setup_out_error
)
1046 len
= min (len
, (size_t)dev
->req
->actual
);
1047 // FIXME don't call this with the spinlock held ...
1048 if (copy_to_user (buf
, dev
->req
->buf
, len
))
1050 clean_req (dev
->gadget
->ep0
, dev
->req
);
1051 /* NOTE userspace can't yet choose to stall */
1057 /* else normal: return event data */
1058 if (len
< sizeof dev
->event
[0]) {
1062 len
-= len
% sizeof (struct usb_gadgetfs_event
);
1063 dev
->usermode_setup
= 1;
1066 /* return queued events right away */
1067 if (dev
->ev_next
!= 0) {
1070 n
= len
/ sizeof (struct usb_gadgetfs_event
);
1071 if (dev
->ev_next
< n
)
1074 /* ep0 i/o has special semantics during STATE_DEV_SETUP */
1075 for (i
= 0; i
< n
; i
++) {
1076 if (dev
->event
[i
].type
== GADGETFS_SETUP
) {
1077 dev
->state
= STATE_DEV_SETUP
;
1082 spin_unlock_irq (&dev
->lock
);
1083 len
= n
* sizeof (struct usb_gadgetfs_event
);
1084 if (copy_to_user (buf
, &dev
->event
, len
))
1089 /* NOTE this doesn't guard against broken drivers;
1090 * concurrent ep0 readers may lose events.
1092 spin_lock_irq (&dev
->lock
);
1093 if (dev
->ev_next
> n
) {
1094 memmove(&dev
->event
[0], &dev
->event
[n
],
1095 sizeof (struct usb_gadgetfs_event
)
1096 * (dev
->ev_next
- n
));
1099 spin_unlock_irq (&dev
->lock
);
1103 if (fd
->f_flags
& O_NONBLOCK
) {
1110 DBG (dev
, "fail %s, state %d\n", __func__
, state
);
1113 case STATE_DEV_UNCONNECTED
:
1114 case STATE_DEV_CONNECTED
:
1115 spin_unlock_irq (&dev
->lock
);
1116 DBG (dev
, "%s wait\n", __func__
);
1118 /* wait for events */
1119 retval
= wait_event_interruptible (dev
->wait
,
1123 spin_lock_irq (&dev
->lock
);
1128 spin_unlock_irq (&dev
->lock
);
1132 static struct usb_gadgetfs_event
*
1133 next_event (struct dev_data
*dev
, enum usb_gadgetfs_event_type type
)
1135 struct usb_gadgetfs_event
*event
;
1139 /* these events purge the queue */
1140 case GADGETFS_DISCONNECT
:
1141 if (dev
->state
== STATE_DEV_SETUP
)
1142 dev
->setup_abort
= 1;
1144 case GADGETFS_CONNECT
:
1147 case GADGETFS_SETUP
: /* previous request timed out */
1148 case GADGETFS_SUSPEND
: /* same effect */
1149 /* these events can't be repeated */
1150 for (i
= 0; i
!= dev
->ev_next
; i
++) {
1151 if (dev
->event
[i
].type
!= type
)
1153 DBG(dev
, "discard old event[%d] %d\n", i
, type
);
1155 if (i
== dev
->ev_next
)
1157 /* indices start at zero, for simplicity */
1158 memmove (&dev
->event
[i
], &dev
->event
[i
+ 1],
1159 sizeof (struct usb_gadgetfs_event
)
1160 * (dev
->ev_next
- i
));
1166 VDEBUG(dev
, "event[%d] = %d\n", dev
->ev_next
, type
);
1167 event
= &dev
->event
[dev
->ev_next
++];
1168 BUG_ON (dev
->ev_next
> N_EVENT
);
1169 memset (event
, 0, sizeof *event
);
1175 ep0_write (struct file
*fd
, const char __user
*buf
, size_t len
, loff_t
*ptr
)
1177 struct dev_data
*dev
= fd
->private_data
;
1178 ssize_t retval
= -ESRCH
;
1180 spin_lock_irq (&dev
->lock
);
1182 /* report fd mode change before acting on it */
1183 if (dev
->setup_abort
) {
1184 dev
->setup_abort
= 0;
1187 /* data and/or status stage for control request */
1188 } else if (dev
->state
== STATE_DEV_SETUP
) {
1190 /* IN DATA+STATUS caller makes len <= wLength */
1191 if (dev
->setup_in
) {
1192 retval
= setup_req (dev
->gadget
->ep0
, dev
->req
, len
);
1194 dev
->state
= STATE_DEV_CONNECTED
;
1195 spin_unlock_irq (&dev
->lock
);
1196 if (copy_from_user (dev
->req
->buf
, buf
, len
))
1199 if (len
< dev
->setup_wLength
)
1201 retval
= usb_ep_queue (
1202 dev
->gadget
->ep0
, dev
->req
,
1206 spin_lock_irq (&dev
->lock
);
1207 clean_req (dev
->gadget
->ep0
, dev
->req
);
1208 spin_unlock_irq (&dev
->lock
);
1215 /* can stall some OUT transfers */
1216 } else if (dev
->setup_can_stall
) {
1217 VDEBUG(dev
, "ep0out stall\n");
1218 (void) usb_ep_set_halt (dev
->gadget
->ep0
);
1220 dev
->state
= STATE_DEV_CONNECTED
;
1222 DBG(dev
, "bogus ep0out stall!\n");
1225 DBG (dev
, "fail %s, state %d\n", __func__
, dev
->state
);
1227 spin_unlock_irq (&dev
->lock
);
1232 ep0_fasync (int f
, struct file
*fd
, int on
)
1234 struct dev_data
*dev
= fd
->private_data
;
1235 // caller must F_SETOWN before signal delivery happens
1236 VDEBUG (dev
, "%s %s\n", __func__
, on
? "on" : "off");
1237 return fasync_helper (f
, fd
, on
, &dev
->fasync
);
1240 static struct usb_gadget_driver gadgetfs_driver
;
1243 dev_release (struct inode
*inode
, struct file
*fd
)
1245 struct dev_data
*dev
= fd
->private_data
;
1247 /* closing ep0 === shutdown all */
1249 usb_gadget_unregister_driver (&gadgetfs_driver
);
1251 /* at this point "good" hardware has disconnected the
1252 * device from USB; the host won't see it any more.
1253 * alternatively, all host requests will time out.
1256 fasync_helper (-1, fd
, 0, &dev
->fasync
);
1261 /* other endpoints were all decoupled from this device */
1262 spin_lock_irq(&dev
->lock
);
1263 dev
->state
= STATE_DEV_DISABLED
;
1264 spin_unlock_irq(&dev
->lock
);
1269 ep0_poll (struct file
*fd
, poll_table
*wait
)
1271 struct dev_data
*dev
= fd
->private_data
;
1274 poll_wait(fd
, &dev
->wait
, wait
);
1276 spin_lock_irq (&dev
->lock
);
1278 /* report fd mode change before acting on it */
1279 if (dev
->setup_abort
) {
1280 dev
->setup_abort
= 0;
1285 if (dev
->state
== STATE_DEV_SETUP
) {
1286 if (dev
->setup_in
|| dev
->setup_can_stall
)
1289 if (dev
->ev_next
!= 0)
1293 spin_unlock_irq(&dev
->lock
);
1297 static int dev_ioctl (struct inode
*inode
, struct file
*fd
,
1298 unsigned code
, unsigned long value
)
1300 struct dev_data
*dev
= fd
->private_data
;
1301 struct usb_gadget
*gadget
= dev
->gadget
;
1303 if (gadget
->ops
->ioctl
)
1304 return gadget
->ops
->ioctl (gadget
, code
, value
);
1308 /* used after device configuration */
1309 static const struct file_operations ep0_io_operations
= {
1310 .owner
= THIS_MODULE
,
1311 .llseek
= no_llseek
,
1315 .fasync
= ep0_fasync
,
1318 .release
= dev_release
,
1321 /*----------------------------------------------------------------------*/
1323 /* The in-kernel gadget driver handles most ep0 issues, in particular
1324 * enumerating the single configuration (as provided from user space).
1326 * Unrecognized ep0 requests may be handled in user space.
1329 #ifdef CONFIG_USB_GADGET_DUALSPEED
1330 static void make_qualifier (struct dev_data
*dev
)
1332 struct usb_qualifier_descriptor qual
;
1333 struct usb_device_descriptor
*desc
;
1335 qual
.bLength
= sizeof qual
;
1336 qual
.bDescriptorType
= USB_DT_DEVICE_QUALIFIER
;
1337 qual
.bcdUSB
= __constant_cpu_to_le16 (0x0200);
1340 qual
.bDeviceClass
= desc
->bDeviceClass
;
1341 qual
.bDeviceSubClass
= desc
->bDeviceSubClass
;
1342 qual
.bDeviceProtocol
= desc
->bDeviceProtocol
;
1344 /* assumes ep0 uses the same value for both speeds ... */
1345 qual
.bMaxPacketSize0
= desc
->bMaxPacketSize0
;
1347 qual
.bNumConfigurations
= 1;
1350 memcpy (dev
->rbuf
, &qual
, sizeof qual
);
1355 config_buf (struct dev_data
*dev
, u8 type
, unsigned index
)
1360 /* only one configuration */
1364 if (gadget_is_dualspeed(dev
->gadget
)) {
1365 hs
= (dev
->gadget
->speed
== USB_SPEED_HIGH
);
1366 if (type
== USB_DT_OTHER_SPEED_CONFIG
)
1370 dev
->req
->buf
= dev
->hs_config
;
1371 len
= le16_to_cpu(dev
->hs_config
->wTotalLength
);
1373 dev
->req
->buf
= dev
->config
;
1374 len
= le16_to_cpu(dev
->config
->wTotalLength
);
1376 ((u8
*)dev
->req
->buf
) [1] = type
;
1381 gadgetfs_setup (struct usb_gadget
*gadget
, const struct usb_ctrlrequest
*ctrl
)
1383 struct dev_data
*dev
= get_gadget_data (gadget
);
1384 struct usb_request
*req
= dev
->req
;
1385 int value
= -EOPNOTSUPP
;
1386 struct usb_gadgetfs_event
*event
;
1387 u16 w_value
= le16_to_cpu(ctrl
->wValue
);
1388 u16 w_length
= le16_to_cpu(ctrl
->wLength
);
1390 spin_lock (&dev
->lock
);
1391 dev
->setup_abort
= 0;
1392 if (dev
->state
== STATE_DEV_UNCONNECTED
) {
1393 if (gadget_is_dualspeed(gadget
)
1394 && gadget
->speed
== USB_SPEED_HIGH
1395 && dev
->hs_config
== NULL
) {
1396 spin_unlock(&dev
->lock
);
1397 ERROR (dev
, "no high speed config??\n");
1401 dev
->state
= STATE_DEV_CONNECTED
;
1402 dev
->dev
->bMaxPacketSize0
= gadget
->ep0
->maxpacket
;
1404 INFO (dev
, "connected\n");
1405 event
= next_event (dev
, GADGETFS_CONNECT
);
1406 event
->u
.speed
= gadget
->speed
;
1409 /* host may have given up waiting for response. we can miss control
1410 * requests handled lower down (device/endpoint status and features);
1411 * then ep0_{read,write} will report the wrong status. controller
1412 * driver will have aborted pending i/o.
1414 } else if (dev
->state
== STATE_DEV_SETUP
)
1415 dev
->setup_abort
= 1;
1417 req
->buf
= dev
->rbuf
;
1418 req
->dma
= DMA_ADDR_INVALID
;
1419 req
->context
= NULL
;
1420 value
= -EOPNOTSUPP
;
1421 switch (ctrl
->bRequest
) {
1423 case USB_REQ_GET_DESCRIPTOR
:
1424 if (ctrl
->bRequestType
!= USB_DIR_IN
)
1426 switch (w_value
>> 8) {
1429 value
= min (w_length
, (u16
) sizeof *dev
->dev
);
1430 req
->buf
= dev
->dev
;
1432 #ifdef CONFIG_USB_GADGET_DUALSPEED
1433 case USB_DT_DEVICE_QUALIFIER
:
1434 if (!dev
->hs_config
)
1436 value
= min (w_length
, (u16
)
1437 sizeof (struct usb_qualifier_descriptor
));
1438 make_qualifier (dev
);
1440 case USB_DT_OTHER_SPEED_CONFIG
:
1444 value
= config_buf (dev
,
1448 value
= min (w_length
, (u16
) value
);
1453 default: // all others are errors
1458 /* currently one config, two speeds */
1459 case USB_REQ_SET_CONFIGURATION
:
1460 if (ctrl
->bRequestType
!= 0)
1462 if (0 == (u8
) w_value
) {
1464 dev
->current_config
= 0;
1465 usb_gadget_vbus_draw(gadget
, 8 /* mA */ );
1466 // user mode expected to disable endpoints
1470 if (gadget_is_dualspeed(gadget
)
1471 && gadget
->speed
== USB_SPEED_HIGH
) {
1472 config
= dev
->hs_config
->bConfigurationValue
;
1473 power
= dev
->hs_config
->bMaxPower
;
1475 config
= dev
->config
->bConfigurationValue
;
1476 power
= dev
->config
->bMaxPower
;
1479 if (config
== (u8
) w_value
) {
1481 dev
->current_config
= config
;
1482 usb_gadget_vbus_draw(gadget
, 2 * power
);
1486 /* report SET_CONFIGURATION like any other control request,
1487 * except that usermode may not stall this. the next
1488 * request mustn't be allowed start until this finishes:
1489 * endpoints and threads set up, etc.
1491 * NOTE: older PXA hardware (before PXA 255: without UDCCFR)
1492 * has bad/racey automagic that prevents synchronizing here.
1493 * even kernel mode drivers often miss them.
1496 INFO (dev
, "configuration #%d\n", dev
->current_config
);
1497 if (dev
->usermode_setup
) {
1498 dev
->setup_can_stall
= 0;
1504 #ifndef CONFIG_USB_GADGET_PXA2XX
1505 /* PXA automagically handles this request too */
1506 case USB_REQ_GET_CONFIGURATION
:
1507 if (ctrl
->bRequestType
!= 0x80)
1509 *(u8
*)req
->buf
= dev
->current_config
;
1510 value
= min (w_length
, (u16
) 1);
1516 VDEBUG (dev
, "%s req%02x.%02x v%04x i%04x l%d\n",
1517 dev
->usermode_setup
? "delegate" : "fail",
1518 ctrl
->bRequestType
, ctrl
->bRequest
,
1519 w_value
, le16_to_cpu(ctrl
->wIndex
), w_length
);
1521 /* if there's an ep0 reader, don't stall */
1522 if (dev
->usermode_setup
) {
1523 dev
->setup_can_stall
= 1;
1525 dev
->setup_in
= (ctrl
->bRequestType
& USB_DIR_IN
)
1527 dev
->setup_wLength
= w_length
;
1528 dev
->setup_out_ready
= 0;
1529 dev
->setup_out_error
= 0;
1532 /* read DATA stage for OUT right away */
1533 if (unlikely (!dev
->setup_in
&& w_length
)) {
1534 value
= setup_req (gadget
->ep0
, dev
->req
,
1538 value
= usb_ep_queue (gadget
->ep0
, dev
->req
,
1541 clean_req (gadget
->ep0
, dev
->req
);
1545 /* we can't currently stall these */
1546 dev
->setup_can_stall
= 0;
1549 /* state changes when reader collects event */
1550 event
= next_event (dev
, GADGETFS_SETUP
);
1551 event
->u
.setup
= *ctrl
;
1553 spin_unlock (&dev
->lock
);
1558 /* proceed with data transfer and status phases? */
1559 if (value
>= 0 && dev
->state
!= STATE_DEV_SETUP
) {
1560 req
->length
= value
;
1561 req
->zero
= value
< w_length
;
1562 value
= usb_ep_queue (gadget
->ep0
, req
, GFP_ATOMIC
);
1564 DBG (dev
, "ep_queue --> %d\n", value
);
1569 /* device stalls when value < 0 */
1570 spin_unlock (&dev
->lock
);
1574 static void destroy_ep_files (struct dev_data
*dev
)
1576 struct list_head
*entry
, *tmp
;
1578 DBG (dev
, "%s %d\n", __func__
, dev
->state
);
1580 /* dev->state must prevent interference */
1582 spin_lock_irq (&dev
->lock
);
1583 list_for_each_safe (entry
, tmp
, &dev
->epfiles
) {
1585 struct inode
*parent
;
1586 struct dentry
*dentry
;
1588 /* break link to FS */
1589 ep
= list_entry (entry
, struct ep_data
, epfiles
);
1590 list_del_init (&ep
->epfiles
);
1591 dentry
= ep
->dentry
;
1593 parent
= dentry
->d_parent
->d_inode
;
1595 /* break link to controller */
1596 if (ep
->state
== STATE_EP_ENABLED
)
1597 (void) usb_ep_disable (ep
->ep
);
1598 ep
->state
= STATE_EP_UNBOUND
;
1599 usb_ep_free_request (ep
->ep
, ep
->req
);
1601 wake_up (&ep
->wait
);
1604 spin_unlock_irq (&dev
->lock
);
1606 /* break link to dcache */
1607 mutex_lock (&parent
->i_mutex
);
1610 mutex_unlock (&parent
->i_mutex
);
1612 /* fds may still be open */
1615 spin_unlock_irq (&dev
->lock
);
1619 static struct inode
*
1620 gadgetfs_create_file (struct super_block
*sb
, char const *name
,
1621 void *data
, const struct file_operations
*fops
,
1622 struct dentry
**dentry_p
);
1624 static int activate_ep_files (struct dev_data
*dev
)
1627 struct ep_data
*data
;
1629 gadget_for_each_ep (ep
, dev
->gadget
) {
1631 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
1634 data
->state
= STATE_EP_DISABLED
;
1635 init_MUTEX (&data
->lock
);
1636 init_waitqueue_head (&data
->wait
);
1638 strncpy (data
->name
, ep
->name
, sizeof (data
->name
) - 1);
1639 atomic_set (&data
->count
, 1);
1644 ep
->driver_data
= data
;
1646 data
->req
= usb_ep_alloc_request (ep
, GFP_KERNEL
);
1650 data
->inode
= gadgetfs_create_file (dev
->sb
, data
->name
,
1651 data
, &ep_config_operations
,
1655 list_add_tail (&data
->epfiles
, &dev
->epfiles
);
1660 usb_ep_free_request (ep
, data
->req
);
1665 DBG (dev
, "%s enomem\n", __func__
);
1666 destroy_ep_files (dev
);
1671 gadgetfs_unbind (struct usb_gadget
*gadget
)
1673 struct dev_data
*dev
= get_gadget_data (gadget
);
1675 DBG (dev
, "%s\n", __func__
);
1677 spin_lock_irq (&dev
->lock
);
1678 dev
->state
= STATE_DEV_UNBOUND
;
1679 spin_unlock_irq (&dev
->lock
);
1681 destroy_ep_files (dev
);
1682 gadget
->ep0
->driver_data
= NULL
;
1683 set_gadget_data (gadget
, NULL
);
1685 /* we've already been disconnected ... no i/o is active */
1687 usb_ep_free_request (gadget
->ep0
, dev
->req
);
1688 DBG (dev
, "%s done\n", __func__
);
1692 static struct dev_data
*the_device
;
1695 gadgetfs_bind (struct usb_gadget
*gadget
)
1697 struct dev_data
*dev
= the_device
;
1701 if (0 != strcmp (CHIP
, gadget
->name
)) {
1702 pr_err("%s expected %s controller not %s\n",
1703 shortname
, CHIP
, gadget
->name
);
1707 set_gadget_data (gadget
, dev
);
1708 dev
->gadget
= gadget
;
1709 gadget
->ep0
->driver_data
= dev
;
1710 dev
->dev
->bMaxPacketSize0
= gadget
->ep0
->maxpacket
;
1712 /* preallocate control response and buffer */
1713 dev
->req
= usb_ep_alloc_request (gadget
->ep0
, GFP_KERNEL
);
1716 dev
->req
->context
= NULL
;
1717 dev
->req
->complete
= epio_complete
;
1719 if (activate_ep_files (dev
) < 0)
1722 INFO (dev
, "bound to %s driver\n", gadget
->name
);
1723 spin_lock_irq(&dev
->lock
);
1724 dev
->state
= STATE_DEV_UNCONNECTED
;
1725 spin_unlock_irq(&dev
->lock
);
1730 gadgetfs_unbind (gadget
);
1735 gadgetfs_disconnect (struct usb_gadget
*gadget
)
1737 struct dev_data
*dev
= get_gadget_data (gadget
);
1739 spin_lock (&dev
->lock
);
1740 if (dev
->state
== STATE_DEV_UNCONNECTED
)
1742 dev
->state
= STATE_DEV_UNCONNECTED
;
1744 INFO (dev
, "disconnected\n");
1745 next_event (dev
, GADGETFS_DISCONNECT
);
1748 spin_unlock (&dev
->lock
);
1752 gadgetfs_suspend (struct usb_gadget
*gadget
)
1754 struct dev_data
*dev
= get_gadget_data (gadget
);
1756 INFO (dev
, "suspended from state %d\n", dev
->state
);
1757 spin_lock (&dev
->lock
);
1758 switch (dev
->state
) {
1759 case STATE_DEV_SETUP
: // VERY odd... host died??
1760 case STATE_DEV_CONNECTED
:
1761 case STATE_DEV_UNCONNECTED
:
1762 next_event (dev
, GADGETFS_SUSPEND
);
1768 spin_unlock (&dev
->lock
);
1771 static struct usb_gadget_driver gadgetfs_driver
= {
1772 #ifdef CONFIG_USB_GADGET_DUALSPEED
1773 .speed
= USB_SPEED_HIGH
,
1775 .speed
= USB_SPEED_FULL
,
1777 .function
= (char *) driver_desc
,
1778 .bind
= gadgetfs_bind
,
1779 .unbind
= gadgetfs_unbind
,
1780 .setup
= gadgetfs_setup
,
1781 .disconnect
= gadgetfs_disconnect
,
1782 .suspend
= gadgetfs_suspend
,
1785 .name
= (char *) shortname
,
1789 /*----------------------------------------------------------------------*/
1791 static void gadgetfs_nop(struct usb_gadget
*arg
) { }
1793 static int gadgetfs_probe (struct usb_gadget
*gadget
)
1795 CHIP
= gadget
->name
;
1799 static struct usb_gadget_driver probe_driver
= {
1800 .speed
= USB_SPEED_HIGH
,
1801 .bind
= gadgetfs_probe
,
1802 .unbind
= gadgetfs_nop
,
1803 .setup
= (void *)gadgetfs_nop
,
1804 .disconnect
= gadgetfs_nop
,
1811 /* DEVICE INITIALIZATION
1813 * fd = open ("/dev/gadget/$CHIP", O_RDWR)
1814 * status = write (fd, descriptors, sizeof descriptors)
1816 * That write establishes the device configuration, so the kernel can
1817 * bind to the controller ... guaranteeing it can handle enumeration
1818 * at all necessary speeds. Descriptor order is:
1820 * . message tag (u32, host order) ... for now, must be zero; it
1821 * would change to support features like multi-config devices
1822 * . full/low speed config ... all wTotalLength bytes (with interface,
1823 * class, altsetting, endpoint, and other descriptors)
1824 * . high speed config ... all descriptors, for high speed operation;
1825 * this one's optional except for high-speed hardware
1826 * . device descriptor
1828 * Endpoints are not yet enabled. Drivers must wait until device
1829 * configuration and interface altsetting changes create
1830 * the need to configure (or unconfigure) them.
1832 * After initialization, the device stays active for as long as that
1833 * $CHIP file is open. Events must then be read from that descriptor,
1834 * such as configuration notifications.
1837 static int is_valid_config (struct usb_config_descriptor
*config
)
1839 return config
->bDescriptorType
== USB_DT_CONFIG
1840 && config
->bLength
== USB_DT_CONFIG_SIZE
1841 && config
->bConfigurationValue
!= 0
1842 && (config
->bmAttributes
& USB_CONFIG_ATT_ONE
) != 0
1843 && (config
->bmAttributes
& USB_CONFIG_ATT_WAKEUP
) == 0;
1844 /* FIXME if gadget->is_otg, _must_ include an otg descriptor */
1845 /* FIXME check lengths: walk to end */
1849 dev_config (struct file
*fd
, const char __user
*buf
, size_t len
, loff_t
*ptr
)
1851 struct dev_data
*dev
= fd
->private_data
;
1852 ssize_t value
= len
, length
= len
;
1857 if (len
< (USB_DT_CONFIG_SIZE
+ USB_DT_DEVICE_SIZE
+ 4))
1860 /* we might need to change message format someday */
1861 if (copy_from_user (&tag
, buf
, 4))
1868 kbuf
= kmalloc (length
, GFP_KERNEL
);
1871 if (copy_from_user (kbuf
, buf
, length
)) {
1876 spin_lock_irq (&dev
->lock
);
1882 /* full or low speed config */
1883 dev
->config
= (void *) kbuf
;
1884 total
= le16_to_cpu(dev
->config
->wTotalLength
);
1885 if (!is_valid_config (dev
->config
) || total
>= length
)
1890 /* optional high speed config */
1891 if (kbuf
[1] == USB_DT_CONFIG
) {
1892 dev
->hs_config
= (void *) kbuf
;
1893 total
= le16_to_cpu(dev
->hs_config
->wTotalLength
);
1894 if (!is_valid_config (dev
->hs_config
) || total
>= length
)
1900 /* could support multiple configs, using another encoding! */
1902 /* device descriptor (tweaked for paranoia) */
1903 if (length
!= USB_DT_DEVICE_SIZE
)
1905 dev
->dev
= (void *)kbuf
;
1906 if (dev
->dev
->bLength
!= USB_DT_DEVICE_SIZE
1907 || dev
->dev
->bDescriptorType
!= USB_DT_DEVICE
1908 || dev
->dev
->bNumConfigurations
!= 1)
1910 dev
->dev
->bNumConfigurations
= 1;
1911 dev
->dev
->bcdUSB
= __constant_cpu_to_le16 (0x0200);
1913 /* triggers gadgetfs_bind(); then we can enumerate. */
1914 spin_unlock_irq (&dev
->lock
);
1915 value
= usb_gadget_register_driver (&gadgetfs_driver
);
1920 /* at this point "good" hardware has for the first time
1921 * let the USB the host see us. alternatively, if users
1922 * unplug/replug that will clear all the error state.
1924 * note: everything running before here was guaranteed
1925 * to choke driver model style diagnostics. from here
1926 * on, they can work ... except in cleanup paths that
1927 * kick in after the ep0 descriptor is closed.
1929 fd
->f_op
= &ep0_io_operations
;
1935 spin_unlock_irq (&dev
->lock
);
1936 pr_debug ("%s: %s fail %Zd, %p\n", shortname
, __func__
, value
, dev
);
1943 dev_open (struct inode
*inode
, struct file
*fd
)
1945 struct dev_data
*dev
= inode
->i_private
;
1948 spin_lock_irq(&dev
->lock
);
1949 if (dev
->state
== STATE_DEV_DISABLED
) {
1951 dev
->state
= STATE_DEV_OPENED
;
1952 fd
->private_data
= dev
;
1956 spin_unlock_irq(&dev
->lock
);
1960 static const struct file_operations dev_init_operations
= {
1961 .owner
= THIS_MODULE
,
1962 .llseek
= no_llseek
,
1965 .write
= dev_config
,
1966 .fasync
= ep0_fasync
,
1968 .release
= dev_release
,
1971 /*----------------------------------------------------------------------*/
1973 /* FILESYSTEM AND SUPERBLOCK OPERATIONS
1975 * Mounting the filesystem creates a controller file, used first for
1976 * device configuration then later for event monitoring.
1980 /* FIXME PAM etc could set this security policy without mount options
1981 * if epfiles inherited ownership and permissons from ep0 ...
1984 static unsigned default_uid
;
1985 static unsigned default_gid
;
1986 static unsigned default_perm
= S_IRUSR
| S_IWUSR
;
1988 module_param (default_uid
, uint
, 0644);
1989 module_param (default_gid
, uint
, 0644);
1990 module_param (default_perm
, uint
, 0644);
1993 static struct inode
*
1994 gadgetfs_make_inode (struct super_block
*sb
,
1995 void *data
, const struct file_operations
*fops
,
1998 struct inode
*inode
= new_inode (sb
);
2001 inode
->i_mode
= mode
;
2002 inode
->i_uid
= default_uid
;
2003 inode
->i_gid
= default_gid
;
2004 inode
->i_blocks
= 0;
2005 inode
->i_atime
= inode
->i_mtime
= inode
->i_ctime
2007 inode
->i_private
= data
;
2008 inode
->i_fop
= fops
;
2013 /* creates in fs root directory, so non-renamable and non-linkable.
2014 * so inode and dentry are paired, until device reconfig.
2016 static struct inode
*
2017 gadgetfs_create_file (struct super_block
*sb
, char const *name
,
2018 void *data
, const struct file_operations
*fops
,
2019 struct dentry
**dentry_p
)
2021 struct dentry
*dentry
;
2022 struct inode
*inode
;
2024 dentry
= d_alloc_name(sb
->s_root
, name
);
2028 inode
= gadgetfs_make_inode (sb
, data
, fops
,
2029 S_IFREG
| (default_perm
& S_IRWXUGO
));
2034 d_add (dentry
, inode
);
2039 static struct super_operations gadget_fs_operations
= {
2040 .statfs
= simple_statfs
,
2041 .drop_inode
= generic_delete_inode
,
2045 gadgetfs_fill_super (struct super_block
*sb
, void *opts
, int silent
)
2047 struct inode
*inode
;
2049 struct dev_data
*dev
;
2054 /* fake probe to determine $CHIP */
2055 (void) usb_gadget_register_driver (&probe_driver
);
2060 sb
->s_blocksize
= PAGE_CACHE_SIZE
;
2061 sb
->s_blocksize_bits
= PAGE_CACHE_SHIFT
;
2062 sb
->s_magic
= GADGETFS_MAGIC
;
2063 sb
->s_op
= &gadget_fs_operations
;
2064 sb
->s_time_gran
= 1;
2067 inode
= gadgetfs_make_inode (sb
,
2068 NULL
, &simple_dir_operations
,
2069 S_IFDIR
| S_IRUGO
| S_IXUGO
);
2072 inode
->i_op
= &simple_dir_inode_operations
;
2073 if (!(d
= d_alloc_root (inode
)))
2077 /* the ep0 file is named after the controller we expect;
2078 * user mode code can use it for sanity checks, like we do.
2085 if (!gadgetfs_create_file (sb
, CHIP
,
2086 dev
, &dev_init_operations
,
2090 /* other endpoint files are available after hardware setup,
2091 * from binding to a controller.
2106 /* "mount -t gadgetfs path /dev/gadget" ends up here */
2108 gadgetfs_get_sb (struct file_system_type
*t
, int flags
,
2109 const char *path
, void *opts
, struct vfsmount
*mnt
)
2111 return get_sb_single (t
, flags
, opts
, gadgetfs_fill_super
, mnt
);
2115 gadgetfs_kill_sb (struct super_block
*sb
)
2117 kill_litter_super (sb
);
2119 put_dev (the_device
);
2124 /*----------------------------------------------------------------------*/
2126 static struct file_system_type gadgetfs_type
= {
2127 .owner
= THIS_MODULE
,
2129 .get_sb
= gadgetfs_get_sb
,
2130 .kill_sb
= gadgetfs_kill_sb
,
2133 /*----------------------------------------------------------------------*/
2135 static int __init
init (void)
2139 status
= register_filesystem (&gadgetfs_type
);
2141 pr_info ("%s: %s, version " DRIVER_VERSION
"\n",
2142 shortname
, driver_desc
);
2147 static void __exit
cleanup (void)
2149 pr_debug ("unregister %s\n", shortname
);
2150 unregister_filesystem (&gadgetfs_type
);
2152 module_exit (cleanup
);