Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * inode.c -- user mode filesystem api for usb gadget controllers |
| 3 | * |
| 4 | * Copyright (C) 2003-2004 David Brownell |
| 5 | * Copyright (C) 2003 Agilent Technologies |
| 6 | * |
| 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. |
| 11 | * |
| 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. |
| 16 | * |
| 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 |
| 20 | */ |
| 21 | |
| 22 | |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 23 | /* #define VERBOSE_DEBUG */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/fs.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> |
Milan Svoboda | e22fc27 | 2006-08-08 22:23:12 -0700 | [diff] [blame] | 34 | #include <linux/poll.h> |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 35 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | #include <linux/device.h> |
| 38 | #include <linux/moduleparam.h> |
| 39 | |
David Brownell | a5262dc | 2007-05-14 19:36:41 -0700 | [diff] [blame] | 40 | #include <linux/usb/gadgetfs.h> |
David Brownell | 9454a57 | 2007-10-04 18:05:17 -0700 | [diff] [blame] | 41 | #include <linux/usb/gadget.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | |
| 44 | /* |
| 45 | * The gadgetfs API maps each endpoint to a file descriptor so that you |
| 46 | * can use standard synchronous read/write calls for I/O. There's some |
| 47 | * O_NONBLOCK and O_ASYNC/FASYNC style i/o support. Example usermode |
| 48 | * drivers show how this works in practice. You can also use AIO to |
| 49 | * eliminate I/O gaps between requests, to help when streaming data. |
| 50 | * |
| 51 | * Key parts that must be USB-specific are protocols defining how the |
| 52 | * read/write operations relate to the hardware state machines. There |
| 53 | * are two types of files. One type is for the device, implementing ep0. |
| 54 | * The other type is for each IN or OUT endpoint. In both cases, the |
| 55 | * user mode driver must configure the hardware before using it. |
| 56 | * |
| 57 | * - First, dev_config() is called when /dev/gadget/$CHIP is configured |
| 58 | * (by writing configuration and device descriptors). Afterwards it |
| 59 | * may serve as a source of device events, used to handle all control |
| 60 | * requests other than basic enumeration. |
| 61 | * |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 62 | * - Then, after a SET_CONFIGURATION control request, ep_config() is |
| 63 | * called when each /dev/gadget/ep* file is configured (by writing |
| 64 | * endpoint descriptors). Afterwards these files are used to write() |
| 65 | * IN data or to read() OUT data. To halt the endpoint, a "wrong |
| 66 | * direction" request is issued (like reading an IN endpoint). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | * |
| 68 | * Unlike "usbfs" the only ioctl()s are for things that are rare, and maybe |
| 69 | * not possible on all hardware. For example, precise fault handling with |
| 70 | * respect to data left in endpoint fifos after aborted operations; or |
| 71 | * selective clearing of endpoint halts, to implement SET_INTERFACE. |
| 72 | */ |
| 73 | |
| 74 | #define DRIVER_DESC "USB Gadget filesystem" |
| 75 | #define DRIVER_VERSION "24 Aug 2004" |
| 76 | |
| 77 | static const char driver_desc [] = DRIVER_DESC; |
| 78 | static const char shortname [] = "gadgetfs"; |
| 79 | |
| 80 | MODULE_DESCRIPTION (DRIVER_DESC); |
| 81 | MODULE_AUTHOR ("David Brownell"); |
| 82 | MODULE_LICENSE ("GPL"); |
| 83 | |
| 84 | |
| 85 | /*----------------------------------------------------------------------*/ |
| 86 | |
| 87 | #define GADGETFS_MAGIC 0xaee71ee7 |
| 88 | #define DMA_ADDR_INVALID (~(dma_addr_t)0) |
| 89 | |
| 90 | /* /dev/gadget/$CHIP represents ep0 and the whole device */ |
| 91 | enum ep0_state { |
| 92 | /* DISBLED is the initial state. |
| 93 | */ |
| 94 | STATE_DEV_DISABLED = 0, |
| 95 | |
| 96 | /* Only one open() of /dev/gadget/$CHIP; only one file tracks |
| 97 | * ep0/device i/o modes and binding to the controller. Driver |
| 98 | * must always write descriptors to initialize the device, then |
| 99 | * the device becomes UNCONNECTED until enumeration. |
| 100 | */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 101 | STATE_DEV_OPENED, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | /* From then on, ep0 fd is in either of two basic modes: |
| 104 | * - (UN)CONNECTED: read usb_gadgetfs_event(s) from it |
| 105 | * - SETUP: read/write will transfer control data and succeed; |
| 106 | * or if "wrong direction", performs protocol stall |
| 107 | */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 108 | STATE_DEV_UNCONNECTED, |
| 109 | STATE_DEV_CONNECTED, |
| 110 | STATE_DEV_SETUP, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
| 112 | /* UNBOUND means the driver closed ep0, so the device won't be |
| 113 | * accessible again (DEV_DISABLED) until all fds are closed. |
| 114 | */ |
| 115 | STATE_DEV_UNBOUND, |
| 116 | }; |
| 117 | |
| 118 | /* enough for the whole queue: most events invalidate others */ |
| 119 | #define N_EVENT 5 |
| 120 | |
| 121 | struct dev_data { |
| 122 | spinlock_t lock; |
| 123 | atomic_t count; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 124 | enum ep0_state state; /* P: lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | struct usb_gadgetfs_event event [N_EVENT]; |
| 126 | unsigned ev_next; |
| 127 | struct fasync_struct *fasync; |
| 128 | u8 current_config; |
| 129 | |
| 130 | /* drivers reading ep0 MUST handle control requests (SETUP) |
| 131 | * reported that way; else the host will time out. |
| 132 | */ |
| 133 | unsigned usermode_setup : 1, |
| 134 | setup_in : 1, |
| 135 | setup_can_stall : 1, |
| 136 | setup_out_ready : 1, |
| 137 | setup_out_error : 1, |
| 138 | setup_abort : 1; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 139 | unsigned setup_wLength; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | /* the rest is basically write-once */ |
| 142 | struct usb_config_descriptor *config, *hs_config; |
| 143 | struct usb_device_descriptor *dev; |
| 144 | struct usb_request *req; |
| 145 | struct usb_gadget *gadget; |
| 146 | struct list_head epfiles; |
| 147 | void *buf; |
| 148 | wait_queue_head_t wait; |
| 149 | struct super_block *sb; |
| 150 | struct dentry *dentry; |
| 151 | |
| 152 | /* except this scratch i/o buffer for ep0 */ |
| 153 | u8 rbuf [256]; |
| 154 | }; |
| 155 | |
| 156 | static inline void get_dev (struct dev_data *data) |
| 157 | { |
| 158 | atomic_inc (&data->count); |
| 159 | } |
| 160 | |
| 161 | static void put_dev (struct dev_data *data) |
| 162 | { |
| 163 | if (likely (!atomic_dec_and_test (&data->count))) |
| 164 | return; |
| 165 | /* needs no more cleanup */ |
| 166 | BUG_ON (waitqueue_active (&data->wait)); |
| 167 | kfree (data); |
| 168 | } |
| 169 | |
| 170 | static struct dev_data *dev_new (void) |
| 171 | { |
| 172 | struct dev_data *dev; |
| 173 | |
Eric Sesterhenn | 7039f42 | 2006-02-27 13:34:10 -0800 | [diff] [blame] | 174 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | if (!dev) |
| 176 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | dev->state = STATE_DEV_DISABLED; |
| 178 | atomic_set (&dev->count, 1); |
| 179 | spin_lock_init (&dev->lock); |
| 180 | INIT_LIST_HEAD (&dev->epfiles); |
| 181 | init_waitqueue_head (&dev->wait); |
| 182 | return dev; |
| 183 | } |
| 184 | |
| 185 | /*----------------------------------------------------------------------*/ |
| 186 | |
| 187 | /* other /dev/gadget/$ENDPOINT files represent endpoints */ |
| 188 | enum ep_state { |
| 189 | STATE_EP_DISABLED = 0, |
| 190 | STATE_EP_READY, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | STATE_EP_ENABLED, |
| 192 | STATE_EP_UNBOUND, |
| 193 | }; |
| 194 | |
| 195 | struct ep_data { |
| 196 | struct semaphore lock; |
| 197 | enum ep_state state; |
| 198 | atomic_t count; |
| 199 | struct dev_data *dev; |
| 200 | /* must hold dev->lock before accessing ep or req */ |
| 201 | struct usb_ep *ep; |
| 202 | struct usb_request *req; |
| 203 | ssize_t status; |
| 204 | char name [16]; |
| 205 | struct usb_endpoint_descriptor desc, hs_desc; |
| 206 | struct list_head epfiles; |
| 207 | wait_queue_head_t wait; |
| 208 | struct dentry *dentry; |
| 209 | struct inode *inode; |
| 210 | }; |
| 211 | |
| 212 | static inline void get_ep (struct ep_data *data) |
| 213 | { |
| 214 | atomic_inc (&data->count); |
| 215 | } |
| 216 | |
| 217 | static void put_ep (struct ep_data *data) |
| 218 | { |
| 219 | if (likely (!atomic_dec_and_test (&data->count))) |
| 220 | return; |
| 221 | put_dev (data->dev); |
| 222 | /* needs no more cleanup */ |
| 223 | BUG_ON (!list_empty (&data->epfiles)); |
| 224 | BUG_ON (waitqueue_active (&data->wait)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | kfree (data); |
| 226 | } |
| 227 | |
| 228 | /*----------------------------------------------------------------------*/ |
| 229 | |
| 230 | /* most "how to use the hardware" policy choices are in userspace: |
| 231 | * mapping endpoint roles (which the driver needs) to the capabilities |
| 232 | * which the usb controller has. most of those capabilities are exposed |
| 233 | * implicitly, starting with the driver name and then endpoint names. |
| 234 | */ |
| 235 | |
| 236 | static const char *CHIP; |
| 237 | |
| 238 | /*----------------------------------------------------------------------*/ |
| 239 | |
| 240 | /* NOTE: don't use dev_printk calls before binding to the gadget |
| 241 | * at the end of ep0 configuration, or after unbind. |
| 242 | */ |
| 243 | |
| 244 | /* too wordy: dev_printk(level , &(d)->gadget->dev , fmt , ## args) */ |
| 245 | #define xprintk(d,level,fmt,args...) \ |
| 246 | printk(level "%s: " fmt , shortname , ## args) |
| 247 | |
| 248 | #ifdef DEBUG |
| 249 | #define DBG(dev,fmt,args...) \ |
| 250 | xprintk(dev , KERN_DEBUG , fmt , ## args) |
| 251 | #else |
| 252 | #define DBG(dev,fmt,args...) \ |
| 253 | do { } while (0) |
| 254 | #endif /* DEBUG */ |
| 255 | |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 256 | #ifdef VERBOSE_DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | #define VDEBUG DBG |
| 258 | #else |
| 259 | #define VDEBUG(dev,fmt,args...) \ |
| 260 | do { } while (0) |
| 261 | #endif /* DEBUG */ |
| 262 | |
| 263 | #define ERROR(dev,fmt,args...) \ |
| 264 | xprintk(dev , KERN_ERR , fmt , ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | #define INFO(dev,fmt,args...) \ |
| 266 | xprintk(dev , KERN_INFO , fmt , ## args) |
| 267 | |
| 268 | |
| 269 | /*----------------------------------------------------------------------*/ |
| 270 | |
| 271 | /* SYNCHRONOUS ENDPOINT OPERATIONS (bulk/intr/iso) |
| 272 | * |
| 273 | * After opening, configure non-control endpoints. Then use normal |
| 274 | * stream read() and write() requests; and maybe ioctl() to get more |
Steven Cole | 093cf72 | 2005-05-03 19:07:24 -0600 | [diff] [blame] | 275 | * precise FIFO status when recovering from cancellation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | */ |
| 277 | |
| 278 | static void epio_complete (struct usb_ep *ep, struct usb_request *req) |
| 279 | { |
| 280 | struct ep_data *epdata = ep->driver_data; |
| 281 | |
| 282 | if (!req->context) |
| 283 | return; |
| 284 | if (req->status) |
| 285 | epdata->status = req->status; |
| 286 | else |
| 287 | epdata->status = req->actual; |
| 288 | complete ((struct completion *)req->context); |
| 289 | } |
| 290 | |
| 291 | /* tasklock endpoint, returning when it's connected. |
| 292 | * still need dev->lock to use epdata->ep. |
| 293 | */ |
| 294 | static int |
| 295 | get_ready_ep (unsigned f_flags, struct ep_data *epdata) |
| 296 | { |
| 297 | int val; |
| 298 | |
| 299 | if (f_flags & O_NONBLOCK) { |
| 300 | if (down_trylock (&epdata->lock) != 0) |
| 301 | goto nonblock; |
| 302 | if (epdata->state != STATE_EP_ENABLED) { |
| 303 | up (&epdata->lock); |
| 304 | nonblock: |
| 305 | val = -EAGAIN; |
| 306 | } else |
| 307 | val = 0; |
| 308 | return val; |
| 309 | } |
| 310 | |
| 311 | if ((val = down_interruptible (&epdata->lock)) < 0) |
| 312 | return val; |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | switch (epdata->state) { |
| 315 | case STATE_EP_ENABLED: |
| 316 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | // case STATE_EP_DISABLED: /* "can't happen" */ |
| 318 | // case STATE_EP_READY: /* "can't happen" */ |
| 319 | default: /* error! */ |
| 320 | pr_debug ("%s: ep %p not available, state %d\n", |
| 321 | shortname, epdata, epdata->state); |
| 322 | // FALLTHROUGH |
| 323 | case STATE_EP_UNBOUND: /* clean disconnect */ |
| 324 | val = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | up (&epdata->lock); |
| 326 | } |
| 327 | return val; |
| 328 | } |
| 329 | |
| 330 | static ssize_t |
| 331 | ep_io (struct ep_data *epdata, void *buf, unsigned len) |
| 332 | { |
Peter Zijlstra | 6e9a473 | 2006-09-30 23:28:10 -0700 | [diff] [blame] | 333 | DECLARE_COMPLETION_ONSTACK (done); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | int value; |
| 335 | |
| 336 | spin_lock_irq (&epdata->dev->lock); |
| 337 | if (likely (epdata->ep != NULL)) { |
| 338 | struct usb_request *req = epdata->req; |
| 339 | |
| 340 | req->context = &done; |
| 341 | req->complete = epio_complete; |
| 342 | req->buf = buf; |
| 343 | req->length = len; |
| 344 | value = usb_ep_queue (epdata->ep, req, GFP_ATOMIC); |
| 345 | } else |
| 346 | value = -ENODEV; |
| 347 | spin_unlock_irq (&epdata->dev->lock); |
| 348 | |
| 349 | if (likely (value == 0)) { |
| 350 | value = wait_event_interruptible (done.wait, done.done); |
| 351 | if (value != 0) { |
| 352 | spin_lock_irq (&epdata->dev->lock); |
| 353 | if (likely (epdata->ep != NULL)) { |
| 354 | DBG (epdata->dev, "%s i/o interrupted\n", |
| 355 | epdata->name); |
| 356 | usb_ep_dequeue (epdata->ep, epdata->req); |
| 357 | spin_unlock_irq (&epdata->dev->lock); |
| 358 | |
| 359 | wait_event (done.wait, done.done); |
| 360 | if (epdata->status == -ECONNRESET) |
| 361 | epdata->status = -EINTR; |
| 362 | } else { |
| 363 | spin_unlock_irq (&epdata->dev->lock); |
| 364 | |
| 365 | DBG (epdata->dev, "endpoint gone\n"); |
| 366 | epdata->status = -ENODEV; |
| 367 | } |
| 368 | } |
| 369 | return epdata->status; |
| 370 | } |
| 371 | return value; |
| 372 | } |
| 373 | |
| 374 | |
| 375 | /* handle a synchronous OUT bulk/intr/iso transfer */ |
| 376 | static ssize_t |
| 377 | ep_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr) |
| 378 | { |
| 379 | struct ep_data *data = fd->private_data; |
| 380 | void *kbuf; |
| 381 | ssize_t value; |
| 382 | |
| 383 | if ((value = get_ready_ep (fd->f_flags, data)) < 0) |
| 384 | return value; |
| 385 | |
| 386 | /* halt any endpoint by doing a "wrong direction" i/o call */ |
| 387 | if (data->desc.bEndpointAddress & USB_DIR_IN) { |
| 388 | if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) |
| 389 | == USB_ENDPOINT_XFER_ISOC) |
| 390 | return -EINVAL; |
| 391 | DBG (data->dev, "%s halt\n", data->name); |
| 392 | spin_lock_irq (&data->dev->lock); |
| 393 | if (likely (data->ep != NULL)) |
| 394 | usb_ep_set_halt (data->ep); |
| 395 | spin_unlock_irq (&data->dev->lock); |
| 396 | up (&data->lock); |
| 397 | return -EBADMSG; |
| 398 | } |
| 399 | |
| 400 | /* FIXME readahead for O_NONBLOCK and poll(); careful with ZLPs */ |
| 401 | |
| 402 | value = -ENOMEM; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 403 | kbuf = kmalloc (len, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | if (unlikely (!kbuf)) |
| 405 | goto free1; |
| 406 | |
| 407 | value = ep_io (data, kbuf, len); |
David Brownell | 1bbc169 | 2005-05-07 13:05:13 -0700 | [diff] [blame] | 408 | VDEBUG (data->dev, "%s read %zu OUT, status %d\n", |
| 409 | data->name, len, (int) value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | if (value >= 0 && copy_to_user (buf, kbuf, value)) |
| 411 | value = -EFAULT; |
| 412 | |
| 413 | free1: |
| 414 | up (&data->lock); |
| 415 | kfree (kbuf); |
| 416 | return value; |
| 417 | } |
| 418 | |
| 419 | /* handle a synchronous IN bulk/intr/iso transfer */ |
| 420 | static ssize_t |
| 421 | ep_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 422 | { |
| 423 | struct ep_data *data = fd->private_data; |
| 424 | void *kbuf; |
| 425 | ssize_t value; |
| 426 | |
| 427 | if ((value = get_ready_ep (fd->f_flags, data)) < 0) |
| 428 | return value; |
| 429 | |
| 430 | /* halt any endpoint by doing a "wrong direction" i/o call */ |
| 431 | if (!(data->desc.bEndpointAddress & USB_DIR_IN)) { |
| 432 | if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) |
| 433 | == USB_ENDPOINT_XFER_ISOC) |
| 434 | return -EINVAL; |
| 435 | DBG (data->dev, "%s halt\n", data->name); |
| 436 | spin_lock_irq (&data->dev->lock); |
| 437 | if (likely (data->ep != NULL)) |
| 438 | usb_ep_set_halt (data->ep); |
| 439 | spin_unlock_irq (&data->dev->lock); |
| 440 | up (&data->lock); |
| 441 | return -EBADMSG; |
| 442 | } |
| 443 | |
| 444 | /* FIXME writebehind for O_NONBLOCK and poll(), qlen = 1 */ |
| 445 | |
| 446 | value = -ENOMEM; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 447 | kbuf = kmalloc (len, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | if (!kbuf) |
| 449 | goto free1; |
| 450 | if (copy_from_user (kbuf, buf, len)) { |
| 451 | value = -EFAULT; |
| 452 | goto free1; |
| 453 | } |
| 454 | |
| 455 | value = ep_io (data, kbuf, len); |
David Brownell | 1bbc169 | 2005-05-07 13:05:13 -0700 | [diff] [blame] | 456 | VDEBUG (data->dev, "%s write %zu IN, status %d\n", |
| 457 | data->name, len, (int) value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | free1: |
| 459 | up (&data->lock); |
| 460 | kfree (kbuf); |
| 461 | return value; |
| 462 | } |
| 463 | |
| 464 | static int |
| 465 | ep_release (struct inode *inode, struct file *fd) |
| 466 | { |
| 467 | struct ep_data *data = fd->private_data; |
Milan Svoboda | ba307f5 | 2006-06-26 07:48:00 -0700 | [diff] [blame] | 468 | int value; |
| 469 | |
| 470 | if ((value = down_interruptible(&data->lock)) < 0) |
| 471 | return value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
| 473 | /* clean up if this can be reopened */ |
| 474 | if (data->state != STATE_EP_UNBOUND) { |
| 475 | data->state = STATE_EP_DISABLED; |
| 476 | data->desc.bDescriptorType = 0; |
| 477 | data->hs_desc.bDescriptorType = 0; |
Pavol Kurina | 4809ecc | 2005-09-07 09:49:34 -0700 | [diff] [blame] | 478 | usb_ep_disable(data->ep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
Milan Svoboda | ba307f5 | 2006-06-26 07:48:00 -0700 | [diff] [blame] | 480 | up (&data->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | put_ep (data); |
| 482 | return 0; |
| 483 | } |
| 484 | |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 485 | static long ep_ioctl(struct file *fd, unsigned code, unsigned long value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | { |
| 487 | struct ep_data *data = fd->private_data; |
| 488 | int status; |
| 489 | |
| 490 | if ((status = get_ready_ep (fd->f_flags, data)) < 0) |
| 491 | return status; |
| 492 | |
| 493 | spin_lock_irq (&data->dev->lock); |
| 494 | if (likely (data->ep != NULL)) { |
| 495 | switch (code) { |
| 496 | case GADGETFS_FIFO_STATUS: |
| 497 | status = usb_ep_fifo_status (data->ep); |
| 498 | break; |
| 499 | case GADGETFS_FIFO_FLUSH: |
| 500 | usb_ep_fifo_flush (data->ep); |
| 501 | break; |
| 502 | case GADGETFS_CLEAR_HALT: |
| 503 | status = usb_ep_clear_halt (data->ep); |
| 504 | break; |
| 505 | default: |
| 506 | status = -ENOTTY; |
| 507 | } |
| 508 | } else |
| 509 | status = -ENODEV; |
| 510 | spin_unlock_irq (&data->dev->lock); |
| 511 | up (&data->lock); |
| 512 | return status; |
| 513 | } |
| 514 | |
| 515 | /*----------------------------------------------------------------------*/ |
| 516 | |
| 517 | /* ASYNCHRONOUS ENDPOINT I/O OPERATIONS (bulk/intr/iso) */ |
| 518 | |
| 519 | struct kiocb_priv { |
| 520 | struct usb_request *req; |
| 521 | struct ep_data *epdata; |
| 522 | void *buf; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 523 | const struct iovec *iv; |
| 524 | unsigned long nr_segs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | unsigned actual; |
| 526 | }; |
| 527 | |
| 528 | static int ep_aio_cancel(struct kiocb *iocb, struct io_event *e) |
| 529 | { |
| 530 | struct kiocb_priv *priv = iocb->private; |
| 531 | struct ep_data *epdata; |
| 532 | int value; |
| 533 | |
| 534 | local_irq_disable(); |
| 535 | epdata = priv->epdata; |
| 536 | // spin_lock(&epdata->dev->lock); |
| 537 | kiocbSetCancelled(iocb); |
| 538 | if (likely(epdata && epdata->ep && priv->req)) |
| 539 | value = usb_ep_dequeue (epdata->ep, priv->req); |
| 540 | else |
| 541 | value = -EINVAL; |
| 542 | // spin_unlock(&epdata->dev->lock); |
| 543 | local_irq_enable(); |
| 544 | |
| 545 | aio_put_req(iocb); |
| 546 | return value; |
| 547 | } |
| 548 | |
| 549 | static ssize_t ep_aio_read_retry(struct kiocb *iocb) |
| 550 | { |
| 551 | struct kiocb_priv *priv = iocb->private; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 552 | ssize_t len, total; |
Sarah Bailey | 50f97a1 | 2007-02-22 22:36:21 -0800 | [diff] [blame] | 553 | void *to_copy; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 554 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 556 | /* we "retry" to get the right mm context for this: */ |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 557 | |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 558 | /* copy stuff into user buffers */ |
| 559 | total = priv->actual; |
| 560 | len = 0; |
Sarah Bailey | 50f97a1 | 2007-02-22 22:36:21 -0800 | [diff] [blame] | 561 | to_copy = priv->buf; |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 562 | for (i=0; i < priv->nr_segs; i++) { |
| 563 | ssize_t this = min((ssize_t)(priv->iv[i].iov_len), total); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 564 | |
Sarah Bailey | 50f97a1 | 2007-02-22 22:36:21 -0800 | [diff] [blame] | 565 | if (copy_to_user(priv->iv[i].iov_base, to_copy, this)) { |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 566 | if (len == 0) |
| 567 | len = -EFAULT; |
| 568 | break; |
| 569 | } |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 570 | |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 571 | total -= this; |
| 572 | len += this; |
Sarah Bailey | 50f97a1 | 2007-02-22 22:36:21 -0800 | [diff] [blame] | 573 | to_copy += this; |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 574 | if (total == 0) |
| 575 | break; |
| 576 | } |
| 577 | kfree(priv->buf); |
| 578 | kfree(priv); |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 579 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req) |
| 583 | { |
| 584 | struct kiocb *iocb = req->context; |
| 585 | struct kiocb_priv *priv = iocb->private; |
| 586 | struct ep_data *epdata = priv->epdata; |
| 587 | |
| 588 | /* lock against disconnect (and ideally, cancel) */ |
| 589 | spin_lock(&epdata->dev->lock); |
| 590 | priv->req = NULL; |
| 591 | priv->epdata = NULL; |
Alan Stern | 49631ca | 2007-01-16 23:28:48 -0800 | [diff] [blame] | 592 | |
| 593 | /* if this was a write or a read returning no data then we |
| 594 | * don't need to copy anything to userspace, so we can |
| 595 | * complete the aio request immediately. |
| 596 | */ |
| 597 | if (priv->iv == NULL || unlikely(req->actual == 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | kfree(req->buf); |
| 599 | kfree(priv); |
| 600 | iocb->private = NULL; |
| 601 | /* aio_complete() reports bytes-transferred _and_ faults */ |
Alan Stern | 49631ca | 2007-01-16 23:28:48 -0800 | [diff] [blame] | 602 | aio_complete(iocb, req->actual ? req->actual : req->status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | req->status); |
| 604 | } else { |
| 605 | /* retry() won't report both; so we hide some faults */ |
| 606 | if (unlikely(0 != req->status)) |
| 607 | DBG(epdata->dev, "%s fault %d len %d\n", |
| 608 | ep->name, req->status, req->actual); |
| 609 | |
| 610 | priv->buf = req->buf; |
| 611 | priv->actual = req->actual; |
| 612 | kick_iocb(iocb); |
| 613 | } |
| 614 | spin_unlock(&epdata->dev->lock); |
| 615 | |
| 616 | usb_ep_free_request(ep, req); |
| 617 | put_ep(epdata); |
| 618 | } |
| 619 | |
| 620 | static ssize_t |
| 621 | ep_aio_rwtail( |
| 622 | struct kiocb *iocb, |
| 623 | char *buf, |
| 624 | size_t len, |
| 625 | struct ep_data *epdata, |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 626 | const struct iovec *iv, |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 627 | unsigned long nr_segs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | ) |
| 629 | { |
Alan Stern | 83196b5 | 2006-05-22 12:26:31 -0400 | [diff] [blame] | 630 | struct kiocb_priv *priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | struct usb_request *req; |
| 632 | ssize_t value; |
| 633 | |
| 634 | priv = kmalloc(sizeof *priv, GFP_KERNEL); |
| 635 | if (!priv) { |
| 636 | value = -ENOMEM; |
| 637 | fail: |
| 638 | kfree(buf); |
| 639 | return value; |
| 640 | } |
| 641 | iocb->private = priv; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 642 | priv->iv = iv; |
| 643 | priv->nr_segs = nr_segs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | |
| 645 | value = get_ready_ep(iocb->ki_filp->f_flags, epdata); |
| 646 | if (unlikely(value < 0)) { |
| 647 | kfree(priv); |
| 648 | goto fail; |
| 649 | } |
| 650 | |
| 651 | iocb->ki_cancel = ep_aio_cancel; |
| 652 | get_ep(epdata); |
| 653 | priv->epdata = epdata; |
| 654 | priv->actual = 0; |
| 655 | |
| 656 | /* each kiocb is coupled to one usb_request, but we can't |
| 657 | * allocate or submit those if the host disconnected. |
| 658 | */ |
| 659 | spin_lock_irq(&epdata->dev->lock); |
| 660 | if (likely(epdata->ep)) { |
| 661 | req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC); |
| 662 | if (likely(req)) { |
| 663 | priv->req = req; |
| 664 | req->buf = buf; |
| 665 | req->length = len; |
| 666 | req->complete = ep_aio_complete; |
| 667 | req->context = iocb; |
| 668 | value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC); |
| 669 | if (unlikely(0 != value)) |
| 670 | usb_ep_free_request(epdata->ep, req); |
| 671 | } else |
| 672 | value = -EAGAIN; |
| 673 | } else |
| 674 | value = -ENODEV; |
| 675 | spin_unlock_irq(&epdata->dev->lock); |
| 676 | |
| 677 | up(&epdata->lock); |
| 678 | |
| 679 | if (unlikely(value)) { |
| 680 | kfree(priv); |
| 681 | put_ep(epdata); |
| 682 | } else |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 683 | value = (iv ? -EIOCBRETRY : -EIOCBQUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | return value; |
| 685 | } |
| 686 | |
| 687 | static ssize_t |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 688 | ep_aio_read(struct kiocb *iocb, const struct iovec *iov, |
| 689 | unsigned long nr_segs, loff_t o) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | { |
| 691 | struct ep_data *epdata = iocb->ki_filp->private_data; |
| 692 | char *buf; |
| 693 | |
| 694 | if (unlikely(epdata->desc.bEndpointAddress & USB_DIR_IN)) |
| 695 | return -EINVAL; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 696 | |
| 697 | buf = kmalloc(iocb->ki_left, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | if (unlikely(!buf)) |
| 699 | return -ENOMEM; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 700 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | iocb->ki_retry = ep_aio_read_retry; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 702 | return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | static ssize_t |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 706 | ep_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 707 | unsigned long nr_segs, loff_t o) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | { |
| 709 | struct ep_data *epdata = iocb->ki_filp->private_data; |
| 710 | char *buf; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 711 | size_t len = 0; |
| 712 | int i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
| 714 | if (unlikely(!(epdata->desc.bEndpointAddress & USB_DIR_IN))) |
| 715 | return -EINVAL; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 716 | |
| 717 | buf = kmalloc(iocb->ki_left, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | if (unlikely(!buf)) |
| 719 | return -ENOMEM; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 720 | |
| 721 | for (i=0; i < nr_segs; i++) { |
| 722 | if (unlikely(copy_from_user(&buf[len], iov[i].iov_base, |
| 723 | iov[i].iov_len) != 0)) { |
| 724 | kfree(buf); |
| 725 | return -EFAULT; |
| 726 | } |
| 727 | len += iov[i].iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | } |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 729 | return ep_aio_rwtail(iocb, buf, len, epdata, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | } |
| 731 | |
| 732 | /*----------------------------------------------------------------------*/ |
| 733 | |
| 734 | /* used after endpoint configuration */ |
Luiz Fernando N. Capitulino | 066202d | 2006-08-05 20:37:11 -0300 | [diff] [blame] | 735 | static const struct file_operations ep_io_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | .owner = THIS_MODULE, |
| 737 | .llseek = no_llseek, |
| 738 | |
| 739 | .read = ep_read, |
| 740 | .write = ep_write, |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 741 | .unlocked_ioctl = ep_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | .release = ep_release, |
| 743 | |
| 744 | .aio_read = ep_aio_read, |
| 745 | .aio_write = ep_aio_write, |
| 746 | }; |
| 747 | |
| 748 | /* ENDPOINT INITIALIZATION |
| 749 | * |
| 750 | * fd = open ("/dev/gadget/$ENDPOINT", O_RDWR) |
| 751 | * status = write (fd, descriptors, sizeof descriptors) |
| 752 | * |
| 753 | * That write establishes the endpoint configuration, configuring |
| 754 | * the controller to process bulk, interrupt, or isochronous transfers |
| 755 | * at the right maxpacket size, and so on. |
| 756 | * |
| 757 | * The descriptors are message type 1, identified by a host order u32 |
| 758 | * at the beginning of what's written. Descriptor order is: full/low |
| 759 | * speed descriptor, then optional high speed descriptor. |
| 760 | */ |
| 761 | static ssize_t |
| 762 | ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 763 | { |
| 764 | struct ep_data *data = fd->private_data; |
| 765 | struct usb_ep *ep; |
| 766 | u32 tag; |
Milan Svoboda | 8a7471a | 2006-06-26 07:19:00 -0700 | [diff] [blame] | 767 | int value, length = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
| 769 | if ((value = down_interruptible (&data->lock)) < 0) |
| 770 | return value; |
| 771 | |
| 772 | if (data->state != STATE_EP_READY) { |
| 773 | value = -EL2HLT; |
| 774 | goto fail; |
| 775 | } |
| 776 | |
| 777 | value = len; |
| 778 | if (len < USB_DT_ENDPOINT_SIZE + 4) |
| 779 | goto fail0; |
| 780 | |
| 781 | /* we might need to change message format someday */ |
| 782 | if (copy_from_user (&tag, buf, 4)) { |
| 783 | goto fail1; |
| 784 | } |
| 785 | if (tag != 1) { |
| 786 | DBG(data->dev, "config %s, bad tag %d\n", data->name, tag); |
| 787 | goto fail0; |
| 788 | } |
| 789 | buf += 4; |
| 790 | len -= 4; |
| 791 | |
| 792 | /* NOTE: audio endpoint extensions not accepted here; |
| 793 | * just don't include the extra bytes. |
| 794 | */ |
| 795 | |
| 796 | /* full/low speed descriptor, then high speed */ |
| 797 | if (copy_from_user (&data->desc, buf, USB_DT_ENDPOINT_SIZE)) { |
| 798 | goto fail1; |
| 799 | } |
| 800 | if (data->desc.bLength != USB_DT_ENDPOINT_SIZE |
| 801 | || data->desc.bDescriptorType != USB_DT_ENDPOINT) |
| 802 | goto fail0; |
| 803 | if (len != USB_DT_ENDPOINT_SIZE) { |
| 804 | if (len != 2 * USB_DT_ENDPOINT_SIZE) |
| 805 | goto fail0; |
| 806 | if (copy_from_user (&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE, |
| 807 | USB_DT_ENDPOINT_SIZE)) { |
| 808 | goto fail1; |
| 809 | } |
| 810 | if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE |
| 811 | || data->hs_desc.bDescriptorType |
| 812 | != USB_DT_ENDPOINT) { |
| 813 | DBG(data->dev, "config %s, bad hs length or type\n", |
| 814 | data->name); |
| 815 | goto fail0; |
| 816 | } |
| 817 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | |
| 819 | spin_lock_irq (&data->dev->lock); |
| 820 | if (data->dev->state == STATE_DEV_UNBOUND) { |
| 821 | value = -ENOENT; |
| 822 | goto gone; |
| 823 | } else if ((ep = data->ep) == NULL) { |
| 824 | value = -ENODEV; |
| 825 | goto gone; |
| 826 | } |
| 827 | switch (data->dev->gadget->speed) { |
| 828 | case USB_SPEED_LOW: |
| 829 | case USB_SPEED_FULL: |
| 830 | value = usb_ep_enable (ep, &data->desc); |
| 831 | if (value == 0) |
| 832 | data->state = STATE_EP_ENABLED; |
| 833 | break; |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 834 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | case USB_SPEED_HIGH: |
| 836 | /* fails if caller didn't provide that descriptor... */ |
| 837 | value = usb_ep_enable (ep, &data->hs_desc); |
| 838 | if (value == 0) |
| 839 | data->state = STATE_EP_ENABLED; |
| 840 | break; |
| 841 | #endif |
| 842 | default: |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 843 | DBG(data->dev, "unconnected, %s init abandoned\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | data->name); |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 845 | value = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
Milan Svoboda | 8a7471a | 2006-06-26 07:19:00 -0700 | [diff] [blame] | 847 | if (value == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | fd->f_op = &ep_io_operations; |
Milan Svoboda | 8a7471a | 2006-06-26 07:19:00 -0700 | [diff] [blame] | 849 | value = length; |
| 850 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | gone: |
| 852 | spin_unlock_irq (&data->dev->lock); |
| 853 | if (value < 0) { |
| 854 | fail: |
| 855 | data->desc.bDescriptorType = 0; |
| 856 | data->hs_desc.bDescriptorType = 0; |
| 857 | } |
| 858 | up (&data->lock); |
| 859 | return value; |
| 860 | fail0: |
| 861 | value = -EINVAL; |
| 862 | goto fail; |
| 863 | fail1: |
| 864 | value = -EFAULT; |
| 865 | goto fail; |
| 866 | } |
| 867 | |
| 868 | static int |
| 869 | ep_open (struct inode *inode, struct file *fd) |
| 870 | { |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 871 | struct ep_data *data = inode->i_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | int value = -EBUSY; |
| 873 | |
| 874 | if (down_interruptible (&data->lock) != 0) |
| 875 | return -EINTR; |
| 876 | spin_lock_irq (&data->dev->lock); |
| 877 | if (data->dev->state == STATE_DEV_UNBOUND) |
| 878 | value = -ENOENT; |
| 879 | else if (data->state == STATE_EP_DISABLED) { |
| 880 | value = 0; |
| 881 | data->state = STATE_EP_READY; |
| 882 | get_ep (data); |
| 883 | fd->private_data = data; |
| 884 | VDEBUG (data->dev, "%s ready\n", data->name); |
| 885 | } else |
| 886 | DBG (data->dev, "%s state %d\n", |
| 887 | data->name, data->state); |
| 888 | spin_unlock_irq (&data->dev->lock); |
| 889 | up (&data->lock); |
| 890 | return value; |
| 891 | } |
| 892 | |
| 893 | /* used before endpoint configuration */ |
Luiz Fernando N. Capitulino | 066202d | 2006-08-05 20:37:11 -0300 | [diff] [blame] | 894 | static const struct file_operations ep_config_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | .owner = THIS_MODULE, |
| 896 | .llseek = no_llseek, |
| 897 | |
| 898 | .open = ep_open, |
| 899 | .write = ep_config, |
| 900 | .release = ep_release, |
| 901 | }; |
| 902 | |
| 903 | /*----------------------------------------------------------------------*/ |
| 904 | |
| 905 | /* EP0 IMPLEMENTATION can be partly in userspace. |
| 906 | * |
| 907 | * Drivers that use this facility receive various events, including |
| 908 | * control requests the kernel doesn't handle. Drivers that don't |
| 909 | * use this facility may be too simple-minded for real applications. |
| 910 | */ |
| 911 | |
| 912 | static inline void ep0_readable (struct dev_data *dev) |
| 913 | { |
| 914 | wake_up (&dev->wait); |
| 915 | kill_fasync (&dev->fasync, SIGIO, POLL_IN); |
| 916 | } |
| 917 | |
| 918 | static void clean_req (struct usb_ep *ep, struct usb_request *req) |
| 919 | { |
| 920 | struct dev_data *dev = ep->driver_data; |
| 921 | |
| 922 | if (req->buf != dev->rbuf) { |
David Brownell | 9d8bab5 | 2007-07-01 11:04:54 -0700 | [diff] [blame] | 923 | kfree(req->buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | req->buf = dev->rbuf; |
| 925 | req->dma = DMA_ADDR_INVALID; |
| 926 | } |
| 927 | req->complete = epio_complete; |
| 928 | dev->setup_out_ready = 0; |
| 929 | } |
| 930 | |
| 931 | static void ep0_complete (struct usb_ep *ep, struct usb_request *req) |
| 932 | { |
| 933 | struct dev_data *dev = ep->driver_data; |
David Brownell | 5b89db02 | 2007-01-16 22:56:26 -0800 | [diff] [blame] | 934 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | int free = 1; |
| 936 | |
| 937 | /* for control OUT, data must still get to userspace */ |
David Brownell | 5b89db02 | 2007-01-16 22:56:26 -0800 | [diff] [blame] | 938 | spin_lock_irqsave(&dev->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | if (!dev->setup_in) { |
| 940 | dev->setup_out_error = (req->status != 0); |
| 941 | if (!dev->setup_out_error) |
| 942 | free = 0; |
| 943 | dev->setup_out_ready = 1; |
| 944 | ep0_readable (dev); |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 945 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | |
| 947 | /* clean up as appropriate */ |
| 948 | if (free && req->buf != &dev->rbuf) |
| 949 | clean_req (ep, req); |
| 950 | req->complete = epio_complete; |
David Brownell | 5b89db02 | 2007-01-16 22:56:26 -0800 | [diff] [blame] | 951 | spin_unlock_irqrestore(&dev->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | } |
| 953 | |
| 954 | static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len) |
| 955 | { |
| 956 | struct dev_data *dev = ep->driver_data; |
| 957 | |
| 958 | if (dev->setup_out_ready) { |
| 959 | DBG (dev, "ep0 request busy!\n"); |
| 960 | return -EBUSY; |
| 961 | } |
| 962 | if (len > sizeof (dev->rbuf)) |
David Brownell | 9d8bab5 | 2007-07-01 11:04:54 -0700 | [diff] [blame] | 963 | req->buf = kmalloc(len, GFP_ATOMIC); |
David Brownell | a947522 | 2007-07-30 12:31:07 -0700 | [diff] [blame] | 964 | if (req->buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | req->buf = dev->rbuf; |
| 966 | return -ENOMEM; |
| 967 | } |
| 968 | req->complete = ep0_complete; |
| 969 | req->length = len; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 970 | req->zero = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | return 0; |
| 972 | } |
| 973 | |
| 974 | static ssize_t |
| 975 | ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr) |
| 976 | { |
| 977 | struct dev_data *dev = fd->private_data; |
| 978 | ssize_t retval; |
| 979 | enum ep0_state state; |
| 980 | |
| 981 | spin_lock_irq (&dev->lock); |
| 982 | |
| 983 | /* report fd mode change before acting on it */ |
| 984 | if (dev->setup_abort) { |
| 985 | dev->setup_abort = 0; |
| 986 | retval = -EIDRM; |
| 987 | goto done; |
| 988 | } |
| 989 | |
| 990 | /* control DATA stage */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 991 | if ((state = dev->state) == STATE_DEV_SETUP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | |
| 993 | if (dev->setup_in) { /* stall IN */ |
| 994 | VDEBUG(dev, "ep0in stall\n"); |
| 995 | (void) usb_ep_set_halt (dev->gadget->ep0); |
| 996 | retval = -EL2HLT; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 997 | dev->state = STATE_DEV_CONNECTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | |
| 999 | } else if (len == 0) { /* ack SET_CONFIGURATION etc */ |
| 1000 | struct usb_ep *ep = dev->gadget->ep0; |
| 1001 | struct usb_request *req = dev->req; |
| 1002 | |
| 1003 | if ((retval = setup_req (ep, req, 0)) == 0) |
| 1004 | retval = usb_ep_queue (ep, req, GFP_ATOMIC); |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1005 | dev->state = STATE_DEV_CONNECTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | |
| 1007 | /* assume that was SET_CONFIGURATION */ |
| 1008 | if (dev->current_config) { |
| 1009 | unsigned power; |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1010 | |
| 1011 | if (gadget_is_dualspeed(dev->gadget) |
| 1012 | && (dev->gadget->speed |
| 1013 | == USB_SPEED_HIGH)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | power = dev->hs_config->bMaxPower; |
| 1015 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | power = dev->config->bMaxPower; |
| 1017 | usb_gadget_vbus_draw(dev->gadget, 2 * power); |
| 1018 | } |
| 1019 | |
| 1020 | } else { /* collect OUT data */ |
| 1021 | if ((fd->f_flags & O_NONBLOCK) != 0 |
| 1022 | && !dev->setup_out_ready) { |
| 1023 | retval = -EAGAIN; |
| 1024 | goto done; |
| 1025 | } |
| 1026 | spin_unlock_irq (&dev->lock); |
| 1027 | retval = wait_event_interruptible (dev->wait, |
| 1028 | dev->setup_out_ready != 0); |
| 1029 | |
| 1030 | /* FIXME state could change from under us */ |
| 1031 | spin_lock_irq (&dev->lock); |
| 1032 | if (retval) |
| 1033 | goto done; |
David Brownell | 5b89db02 | 2007-01-16 22:56:26 -0800 | [diff] [blame] | 1034 | |
| 1035 | if (dev->state != STATE_DEV_SETUP) { |
| 1036 | retval = -ECANCELED; |
| 1037 | goto done; |
| 1038 | } |
| 1039 | dev->state = STATE_DEV_CONNECTED; |
| 1040 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | if (dev->setup_out_error) |
| 1042 | retval = -EIO; |
| 1043 | else { |
| 1044 | len = min (len, (size_t)dev->req->actual); |
| 1045 | // FIXME don't call this with the spinlock held ... |
Skip Hansen | 997694d | 2006-09-01 15:26:27 -0700 | [diff] [blame] | 1046 | if (copy_to_user (buf, dev->req->buf, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | retval = -EFAULT; |
| 1048 | clean_req (dev->gadget->ep0, dev->req); |
| 1049 | /* NOTE userspace can't yet choose to stall */ |
| 1050 | } |
| 1051 | } |
| 1052 | goto done; |
| 1053 | } |
| 1054 | |
| 1055 | /* else normal: return event data */ |
| 1056 | if (len < sizeof dev->event [0]) { |
| 1057 | retval = -EINVAL; |
| 1058 | goto done; |
| 1059 | } |
| 1060 | len -= len % sizeof (struct usb_gadgetfs_event); |
| 1061 | dev->usermode_setup = 1; |
| 1062 | |
| 1063 | scan: |
| 1064 | /* return queued events right away */ |
| 1065 | if (dev->ev_next != 0) { |
| 1066 | unsigned i, n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | n = len / sizeof (struct usb_gadgetfs_event); |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1069 | if (dev->ev_next < n) |
| 1070 | n = dev->ev_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1072 | /* ep0 i/o has special semantics during STATE_DEV_SETUP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | for (i = 0; i < n; i++) { |
| 1074 | if (dev->event [i].type == GADGETFS_SETUP) { |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1075 | dev->state = STATE_DEV_SETUP; |
| 1076 | n = i + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | break; |
| 1078 | } |
| 1079 | } |
| 1080 | spin_unlock_irq (&dev->lock); |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1081 | len = n * sizeof (struct usb_gadgetfs_event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | if (copy_to_user (buf, &dev->event, len)) |
| 1083 | retval = -EFAULT; |
| 1084 | else |
| 1085 | retval = len; |
| 1086 | if (len > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | /* NOTE this doesn't guard against broken drivers; |
| 1088 | * concurrent ep0 readers may lose events. |
| 1089 | */ |
| 1090 | spin_lock_irq (&dev->lock); |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1091 | if (dev->ev_next > n) { |
| 1092 | memmove(&dev->event[0], &dev->event[n], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | sizeof (struct usb_gadgetfs_event) |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1094 | * (dev->ev_next - n)); |
| 1095 | } |
| 1096 | dev->ev_next -= n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | spin_unlock_irq (&dev->lock); |
| 1098 | } |
| 1099 | return retval; |
| 1100 | } |
| 1101 | if (fd->f_flags & O_NONBLOCK) { |
| 1102 | retval = -EAGAIN; |
| 1103 | goto done; |
| 1104 | } |
| 1105 | |
| 1106 | switch (state) { |
| 1107 | default: |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1108 | DBG (dev, "fail %s, state %d\n", __func__, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | retval = -ESRCH; |
| 1110 | break; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1111 | case STATE_DEV_UNCONNECTED: |
| 1112 | case STATE_DEV_CONNECTED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | spin_unlock_irq (&dev->lock); |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1114 | DBG (dev, "%s wait\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | |
| 1116 | /* wait for events */ |
| 1117 | retval = wait_event_interruptible (dev->wait, |
| 1118 | dev->ev_next != 0); |
| 1119 | if (retval < 0) |
| 1120 | return retval; |
| 1121 | spin_lock_irq (&dev->lock); |
| 1122 | goto scan; |
| 1123 | } |
| 1124 | |
| 1125 | done: |
| 1126 | spin_unlock_irq (&dev->lock); |
| 1127 | return retval; |
| 1128 | } |
| 1129 | |
| 1130 | static struct usb_gadgetfs_event * |
| 1131 | next_event (struct dev_data *dev, enum usb_gadgetfs_event_type type) |
| 1132 | { |
| 1133 | struct usb_gadgetfs_event *event; |
| 1134 | unsigned i; |
| 1135 | |
| 1136 | switch (type) { |
| 1137 | /* these events purge the queue */ |
| 1138 | case GADGETFS_DISCONNECT: |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1139 | if (dev->state == STATE_DEV_SETUP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | dev->setup_abort = 1; |
| 1141 | // FALL THROUGH |
| 1142 | case GADGETFS_CONNECT: |
| 1143 | dev->ev_next = 0; |
| 1144 | break; |
| 1145 | case GADGETFS_SETUP: /* previous request timed out */ |
| 1146 | case GADGETFS_SUSPEND: /* same effect */ |
| 1147 | /* these events can't be repeated */ |
| 1148 | for (i = 0; i != dev->ev_next; i++) { |
| 1149 | if (dev->event [i].type != type) |
| 1150 | continue; |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1151 | DBG(dev, "discard old event[%d] %d\n", i, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | dev->ev_next--; |
| 1153 | if (i == dev->ev_next) |
| 1154 | break; |
| 1155 | /* indices start at zero, for simplicity */ |
| 1156 | memmove (&dev->event [i], &dev->event [i + 1], |
| 1157 | sizeof (struct usb_gadgetfs_event) |
| 1158 | * (dev->ev_next - i)); |
| 1159 | } |
| 1160 | break; |
| 1161 | default: |
| 1162 | BUG (); |
| 1163 | } |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1164 | VDEBUG(dev, "event[%d] = %d\n", dev->ev_next, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | event = &dev->event [dev->ev_next++]; |
| 1166 | BUG_ON (dev->ev_next > N_EVENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | memset (event, 0, sizeof *event); |
| 1168 | event->type = type; |
| 1169 | return event; |
| 1170 | } |
| 1171 | |
| 1172 | static ssize_t |
| 1173 | ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 1174 | { |
| 1175 | struct dev_data *dev = fd->private_data; |
| 1176 | ssize_t retval = -ESRCH; |
| 1177 | |
| 1178 | spin_lock_irq (&dev->lock); |
| 1179 | |
| 1180 | /* report fd mode change before acting on it */ |
| 1181 | if (dev->setup_abort) { |
| 1182 | dev->setup_abort = 0; |
| 1183 | retval = -EIDRM; |
| 1184 | |
| 1185 | /* data and/or status stage for control request */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1186 | } else if (dev->state == STATE_DEV_SETUP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
| 1188 | /* IN DATA+STATUS caller makes len <= wLength */ |
| 1189 | if (dev->setup_in) { |
| 1190 | retval = setup_req (dev->gadget->ep0, dev->req, len); |
| 1191 | if (retval == 0) { |
David Brownell | 5b89db02 | 2007-01-16 22:56:26 -0800 | [diff] [blame] | 1192 | dev->state = STATE_DEV_CONNECTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | spin_unlock_irq (&dev->lock); |
| 1194 | if (copy_from_user (dev->req->buf, buf, len)) |
| 1195 | retval = -EFAULT; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 1196 | else { |
| 1197 | if (len < dev->setup_wLength) |
| 1198 | dev->req->zero = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | retval = usb_ep_queue ( |
| 1200 | dev->gadget->ep0, dev->req, |
| 1201 | GFP_KERNEL); |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 1202 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | if (retval < 0) { |
| 1204 | spin_lock_irq (&dev->lock); |
| 1205 | clean_req (dev->gadget->ep0, dev->req); |
| 1206 | spin_unlock_irq (&dev->lock); |
| 1207 | } else |
| 1208 | retval = len; |
| 1209 | |
| 1210 | return retval; |
| 1211 | } |
| 1212 | |
| 1213 | /* can stall some OUT transfers */ |
| 1214 | } else if (dev->setup_can_stall) { |
| 1215 | VDEBUG(dev, "ep0out stall\n"); |
| 1216 | (void) usb_ep_set_halt (dev->gadget->ep0); |
| 1217 | retval = -EL2HLT; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1218 | dev->state = STATE_DEV_CONNECTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | } else { |
| 1220 | DBG(dev, "bogus ep0out stall!\n"); |
| 1221 | } |
| 1222 | } else |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1223 | DBG (dev, "fail %s, state %d\n", __func__, dev->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | |
| 1225 | spin_unlock_irq (&dev->lock); |
| 1226 | return retval; |
| 1227 | } |
| 1228 | |
| 1229 | static int |
| 1230 | ep0_fasync (int f, struct file *fd, int on) |
| 1231 | { |
| 1232 | struct dev_data *dev = fd->private_data; |
| 1233 | // caller must F_SETOWN before signal delivery happens |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1234 | VDEBUG (dev, "%s %s\n", __func__, on ? "on" : "off"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | return fasync_helper (f, fd, on, &dev->fasync); |
| 1236 | } |
| 1237 | |
| 1238 | static struct usb_gadget_driver gadgetfs_driver; |
| 1239 | |
| 1240 | static int |
| 1241 | dev_release (struct inode *inode, struct file *fd) |
| 1242 | { |
| 1243 | struct dev_data *dev = fd->private_data; |
| 1244 | |
| 1245 | /* closing ep0 === shutdown all */ |
| 1246 | |
| 1247 | usb_gadget_unregister_driver (&gadgetfs_driver); |
| 1248 | |
| 1249 | /* at this point "good" hardware has disconnected the |
| 1250 | * device from USB; the host won't see it any more. |
| 1251 | * alternatively, all host requests will time out. |
| 1252 | */ |
| 1253 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | kfree (dev->buf); |
| 1255 | dev->buf = NULL; |
| 1256 | put_dev (dev); |
| 1257 | |
| 1258 | /* other endpoints were all decoupled from this device */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1259 | spin_lock_irq(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | dev->state = STATE_DEV_DISABLED; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1261 | spin_unlock_irq(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | return 0; |
| 1263 | } |
| 1264 | |
Milan Svoboda | e22fc27 | 2006-08-08 22:23:12 -0700 | [diff] [blame] | 1265 | static unsigned int |
| 1266 | ep0_poll (struct file *fd, poll_table *wait) |
| 1267 | { |
| 1268 | struct dev_data *dev = fd->private_data; |
| 1269 | int mask = 0; |
| 1270 | |
| 1271 | poll_wait(fd, &dev->wait, wait); |
| 1272 | |
| 1273 | spin_lock_irq (&dev->lock); |
| 1274 | |
| 1275 | /* report fd mode change before acting on it */ |
| 1276 | if (dev->setup_abort) { |
| 1277 | dev->setup_abort = 0; |
| 1278 | mask = POLLHUP; |
| 1279 | goto out; |
| 1280 | } |
| 1281 | |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1282 | if (dev->state == STATE_DEV_SETUP) { |
Milan Svoboda | e22fc27 | 2006-08-08 22:23:12 -0700 | [diff] [blame] | 1283 | if (dev->setup_in || dev->setup_can_stall) |
| 1284 | mask = POLLOUT; |
| 1285 | } else { |
| 1286 | if (dev->ev_next != 0) |
| 1287 | mask = POLLIN; |
| 1288 | } |
| 1289 | out: |
| 1290 | spin_unlock_irq(&dev->lock); |
| 1291 | return mask; |
| 1292 | } |
| 1293 | |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 1294 | static long dev_ioctl (struct file *fd, unsigned code, unsigned long value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | { |
| 1296 | struct dev_data *dev = fd->private_data; |
| 1297 | struct usb_gadget *gadget = dev->gadget; |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 1298 | long ret = -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 1300 | if (gadget->ops->ioctl) { |
| 1301 | lock_kernel(); |
| 1302 | ret = gadget->ops->ioctl (gadget, code, value); |
| 1303 | unlock_kernel(); |
| 1304 | } |
| 1305 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | } |
| 1307 | |
| 1308 | /* used after device configuration */ |
Luiz Fernando N. Capitulino | 066202d | 2006-08-05 20:37:11 -0300 | [diff] [blame] | 1309 | static const struct file_operations ep0_io_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | .owner = THIS_MODULE, |
| 1311 | .llseek = no_llseek, |
| 1312 | |
| 1313 | .read = ep0_read, |
| 1314 | .write = ep0_write, |
| 1315 | .fasync = ep0_fasync, |
Milan Svoboda | e22fc27 | 2006-08-08 22:23:12 -0700 | [diff] [blame] | 1316 | .poll = ep0_poll, |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 1317 | .unlocked_ioctl = dev_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | .release = dev_release, |
| 1319 | }; |
| 1320 | |
| 1321 | /*----------------------------------------------------------------------*/ |
| 1322 | |
| 1323 | /* The in-kernel gadget driver handles most ep0 issues, in particular |
| 1324 | * enumerating the single configuration (as provided from user space). |
| 1325 | * |
| 1326 | * Unrecognized ep0 requests may be handled in user space. |
| 1327 | */ |
| 1328 | |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1329 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | static void make_qualifier (struct dev_data *dev) |
| 1331 | { |
| 1332 | struct usb_qualifier_descriptor qual; |
| 1333 | struct usb_device_descriptor *desc; |
| 1334 | |
| 1335 | qual.bLength = sizeof qual; |
| 1336 | qual.bDescriptorType = USB_DT_DEVICE_QUALIFIER; |
| 1337 | qual.bcdUSB = __constant_cpu_to_le16 (0x0200); |
| 1338 | |
| 1339 | desc = dev->dev; |
| 1340 | qual.bDeviceClass = desc->bDeviceClass; |
| 1341 | qual.bDeviceSubClass = desc->bDeviceSubClass; |
| 1342 | qual.bDeviceProtocol = desc->bDeviceProtocol; |
| 1343 | |
| 1344 | /* assumes ep0 uses the same value for both speeds ... */ |
| 1345 | qual.bMaxPacketSize0 = desc->bMaxPacketSize0; |
| 1346 | |
| 1347 | qual.bNumConfigurations = 1; |
| 1348 | qual.bRESERVED = 0; |
| 1349 | |
| 1350 | memcpy (dev->rbuf, &qual, sizeof qual); |
| 1351 | } |
| 1352 | #endif |
| 1353 | |
| 1354 | static int |
| 1355 | config_buf (struct dev_data *dev, u8 type, unsigned index) |
| 1356 | { |
| 1357 | int len; |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1358 | int hs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | |
| 1360 | /* only one configuration */ |
| 1361 | if (index > 0) |
| 1362 | return -EINVAL; |
| 1363 | |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1364 | if (gadget_is_dualspeed(dev->gadget)) { |
| 1365 | hs = (dev->gadget->speed == USB_SPEED_HIGH); |
| 1366 | if (type == USB_DT_OTHER_SPEED_CONFIG) |
| 1367 | hs = !hs; |
| 1368 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | if (hs) { |
| 1370 | dev->req->buf = dev->hs_config; |
David Brownell | 01ee7d7 | 2007-05-25 20:40:14 -0700 | [diff] [blame] | 1371 | len = le16_to_cpu(dev->hs_config->wTotalLength); |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1372 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | dev->req->buf = dev->config; |
David Brownell | 01ee7d7 | 2007-05-25 20:40:14 -0700 | [diff] [blame] | 1374 | len = le16_to_cpu(dev->config->wTotalLength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | } |
| 1376 | ((u8 *)dev->req->buf) [1] = type; |
| 1377 | return len; |
| 1378 | } |
| 1379 | |
| 1380 | static int |
| 1381 | gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) |
| 1382 | { |
| 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; |
David Brownell | 1bbc169 | 2005-05-07 13:05:13 -0700 | [diff] [blame] | 1387 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 1388 | u16 w_length = le16_to_cpu(ctrl->wLength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | |
| 1390 | spin_lock (&dev->lock); |
| 1391 | dev->setup_abort = 0; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1392 | if (dev->state == STATE_DEV_UNCONNECTED) { |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1393 | if (gadget_is_dualspeed(gadget) |
| 1394 | && gadget->speed == USB_SPEED_HIGH |
| 1395 | && dev->hs_config == NULL) { |
David Brownell | ce46794 | 2007-01-16 23:06:07 -0800 | [diff] [blame] | 1396 | spin_unlock(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | ERROR (dev, "no high speed config??\n"); |
| 1398 | return -EINVAL; |
| 1399 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | |
David Brownell | ce46794 | 2007-01-16 23:06:07 -0800 | [diff] [blame] | 1401 | dev->state = STATE_DEV_CONNECTED; |
| 1402 | dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket; |
| 1403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | INFO (dev, "connected\n"); |
| 1405 | event = next_event (dev, GADGETFS_CONNECT); |
| 1406 | event->u.speed = gadget->speed; |
| 1407 | ep0_readable (dev); |
| 1408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
| 1413 | */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1414 | } else if (dev->state == STATE_DEV_SETUP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | dev->setup_abort = 1; |
| 1416 | |
| 1417 | req->buf = dev->rbuf; |
| 1418 | req->dma = DMA_ADDR_INVALID; |
| 1419 | req->context = NULL; |
| 1420 | value = -EOPNOTSUPP; |
| 1421 | switch (ctrl->bRequest) { |
| 1422 | |
| 1423 | case USB_REQ_GET_DESCRIPTOR: |
| 1424 | if (ctrl->bRequestType != USB_DIR_IN) |
| 1425 | goto unrecognized; |
| 1426 | switch (w_value >> 8) { |
| 1427 | |
| 1428 | case USB_DT_DEVICE: |
| 1429 | value = min (w_length, (u16) sizeof *dev->dev); |
| 1430 | req->buf = dev->dev; |
| 1431 | break; |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1432 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | case USB_DT_DEVICE_QUALIFIER: |
| 1434 | if (!dev->hs_config) |
| 1435 | break; |
| 1436 | value = min (w_length, (u16) |
| 1437 | sizeof (struct usb_qualifier_descriptor)); |
| 1438 | make_qualifier (dev); |
| 1439 | break; |
| 1440 | case USB_DT_OTHER_SPEED_CONFIG: |
| 1441 | // FALLTHROUGH |
| 1442 | #endif |
| 1443 | case USB_DT_CONFIG: |
| 1444 | value = config_buf (dev, |
| 1445 | w_value >> 8, |
| 1446 | w_value & 0xff); |
| 1447 | if (value >= 0) |
| 1448 | value = min (w_length, (u16) value); |
| 1449 | break; |
| 1450 | case USB_DT_STRING: |
| 1451 | goto unrecognized; |
| 1452 | |
| 1453 | default: // all others are errors |
| 1454 | break; |
| 1455 | } |
| 1456 | break; |
| 1457 | |
| 1458 | /* currently one config, two speeds */ |
| 1459 | case USB_REQ_SET_CONFIGURATION: |
| 1460 | if (ctrl->bRequestType != 0) |
Roy Hashimoto | 12cd5b9 | 2008-03-12 13:55:31 -0800 | [diff] [blame] | 1461 | goto unrecognized; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | if (0 == (u8) w_value) { |
| 1463 | value = 0; |
| 1464 | dev->current_config = 0; |
| 1465 | usb_gadget_vbus_draw(gadget, 8 /* mA */ ); |
| 1466 | // user mode expected to disable endpoints |
| 1467 | } else { |
| 1468 | u8 config, power; |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1469 | |
| 1470 | if (gadget_is_dualspeed(gadget) |
| 1471 | && gadget->speed == USB_SPEED_HIGH) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | config = dev->hs_config->bConfigurationValue; |
| 1473 | power = dev->hs_config->bMaxPower; |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1474 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | config = dev->config->bConfigurationValue; |
| 1476 | power = dev->config->bMaxPower; |
| 1477 | } |
| 1478 | |
| 1479 | if (config == (u8) w_value) { |
| 1480 | value = 0; |
| 1481 | dev->current_config = config; |
| 1482 | usb_gadget_vbus_draw(gadget, 2 * power); |
| 1483 | } |
| 1484 | } |
| 1485 | |
| 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. |
| 1490 | * |
| 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. |
| 1494 | */ |
| 1495 | if (value == 0) { |
| 1496 | INFO (dev, "configuration #%d\n", dev->current_config); |
| 1497 | if (dev->usermode_setup) { |
| 1498 | dev->setup_can_stall = 0; |
| 1499 | goto delegate; |
| 1500 | } |
| 1501 | } |
| 1502 | break; |
| 1503 | |
Philipp Zabel | 7a85762 | 2008-06-22 23:36:39 +0100 | [diff] [blame] | 1504 | #ifndef CONFIG_USB_GADGET_PXA25X |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | /* PXA automagically handles this request too */ |
| 1506 | case USB_REQ_GET_CONFIGURATION: |
| 1507 | if (ctrl->bRequestType != 0x80) |
Roy Hashimoto | 12cd5b9 | 2008-03-12 13:55:31 -0800 | [diff] [blame] | 1508 | goto unrecognized; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | *(u8 *)req->buf = dev->current_config; |
| 1510 | value = min (w_length, (u16) 1); |
| 1511 | break; |
| 1512 | #endif |
| 1513 | |
| 1514 | default: |
| 1515 | unrecognized: |
| 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); |
| 1520 | |
| 1521 | /* if there's an ep0 reader, don't stall */ |
| 1522 | if (dev->usermode_setup) { |
| 1523 | dev->setup_can_stall = 1; |
| 1524 | delegate: |
| 1525 | dev->setup_in = (ctrl->bRequestType & USB_DIR_IN) |
| 1526 | ? 1 : 0; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 1527 | dev->setup_wLength = w_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | dev->setup_out_ready = 0; |
| 1529 | dev->setup_out_error = 0; |
| 1530 | value = 0; |
| 1531 | |
| 1532 | /* read DATA stage for OUT right away */ |
| 1533 | if (unlikely (!dev->setup_in && w_length)) { |
| 1534 | value = setup_req (gadget->ep0, dev->req, |
| 1535 | w_length); |
| 1536 | if (value < 0) |
| 1537 | break; |
| 1538 | value = usb_ep_queue (gadget->ep0, dev->req, |
| 1539 | GFP_ATOMIC); |
| 1540 | if (value < 0) { |
| 1541 | clean_req (gadget->ep0, dev->req); |
| 1542 | break; |
| 1543 | } |
| 1544 | |
| 1545 | /* we can't currently stall these */ |
| 1546 | dev->setup_can_stall = 0; |
| 1547 | } |
| 1548 | |
| 1549 | /* state changes when reader collects event */ |
| 1550 | event = next_event (dev, GADGETFS_SETUP); |
| 1551 | event->u.setup = *ctrl; |
| 1552 | ep0_readable (dev); |
| 1553 | spin_unlock (&dev->lock); |
| 1554 | return 0; |
| 1555 | } |
| 1556 | } |
| 1557 | |
| 1558 | /* proceed with data transfer and status phases? */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1559 | if (value >= 0 && dev->state != STATE_DEV_SETUP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | req->length = value; |
| 1561 | req->zero = value < w_length; |
| 1562 | value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC); |
| 1563 | if (value < 0) { |
| 1564 | DBG (dev, "ep_queue --> %d\n", value); |
| 1565 | req->status = 0; |
| 1566 | } |
| 1567 | } |
| 1568 | |
| 1569 | /* device stalls when value < 0 */ |
| 1570 | spin_unlock (&dev->lock); |
| 1571 | return value; |
| 1572 | } |
| 1573 | |
| 1574 | static void destroy_ep_files (struct dev_data *dev) |
| 1575 | { |
| 1576 | struct list_head *entry, *tmp; |
| 1577 | |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1578 | DBG (dev, "%s %d\n", __func__, dev->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | |
| 1580 | /* dev->state must prevent interference */ |
| 1581 | restart: |
| 1582 | spin_lock_irq (&dev->lock); |
| 1583 | list_for_each_safe (entry, tmp, &dev->epfiles) { |
| 1584 | struct ep_data *ep; |
| 1585 | struct inode *parent; |
| 1586 | struct dentry *dentry; |
| 1587 | |
| 1588 | /* break link to FS */ |
| 1589 | ep = list_entry (entry, struct ep_data, epfiles); |
| 1590 | list_del_init (&ep->epfiles); |
| 1591 | dentry = ep->dentry; |
| 1592 | ep->dentry = NULL; |
| 1593 | parent = dentry->d_parent->d_inode; |
| 1594 | |
| 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); |
| 1600 | ep->ep = NULL; |
| 1601 | wake_up (&ep->wait); |
| 1602 | put_ep (ep); |
| 1603 | |
| 1604 | spin_unlock_irq (&dev->lock); |
| 1605 | |
| 1606 | /* break link to dcache */ |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1607 | mutex_lock (&parent->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | d_delete (dentry); |
| 1609 | dput (dentry); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1610 | mutex_unlock (&parent->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | |
| 1612 | /* fds may still be open */ |
| 1613 | goto restart; |
| 1614 | } |
| 1615 | spin_unlock_irq (&dev->lock); |
| 1616 | } |
| 1617 | |
| 1618 | |
| 1619 | static struct inode * |
| 1620 | gadgetfs_create_file (struct super_block *sb, char const *name, |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 1621 | void *data, const struct file_operations *fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | struct dentry **dentry_p); |
| 1623 | |
| 1624 | static int activate_ep_files (struct dev_data *dev) |
| 1625 | { |
| 1626 | struct usb_ep *ep; |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1627 | struct ep_data *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | |
| 1629 | gadget_for_each_ep (ep, dev->gadget) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | |
Eric Sesterhenn | 7039f42 | 2006-02-27 13:34:10 -0800 | [diff] [blame] | 1631 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | if (!data) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1633 | goto enomem0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | data->state = STATE_EP_DISABLED; |
| 1635 | init_MUTEX (&data->lock); |
| 1636 | init_waitqueue_head (&data->wait); |
| 1637 | |
| 1638 | strncpy (data->name, ep->name, sizeof (data->name) - 1); |
| 1639 | atomic_set (&data->count, 1); |
| 1640 | data->dev = dev; |
| 1641 | get_dev (dev); |
| 1642 | |
| 1643 | data->ep = ep; |
| 1644 | ep->driver_data = data; |
| 1645 | |
| 1646 | data->req = usb_ep_alloc_request (ep, GFP_KERNEL); |
| 1647 | if (!data->req) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1648 | goto enomem1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | |
| 1650 | data->inode = gadgetfs_create_file (dev->sb, data->name, |
| 1651 | data, &ep_config_operations, |
| 1652 | &data->dentry); |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1653 | if (!data->inode) |
| 1654 | goto enomem2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | list_add_tail (&data->epfiles, &dev->epfiles); |
| 1656 | } |
| 1657 | return 0; |
| 1658 | |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1659 | enomem2: |
| 1660 | usb_ep_free_request (ep, data->req); |
| 1661 | enomem1: |
| 1662 | put_dev (dev); |
| 1663 | kfree (data); |
| 1664 | enomem0: |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1665 | DBG (dev, "%s enomem\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | destroy_ep_files (dev); |
| 1667 | return -ENOMEM; |
| 1668 | } |
| 1669 | |
| 1670 | static void |
| 1671 | gadgetfs_unbind (struct usb_gadget *gadget) |
| 1672 | { |
| 1673 | struct dev_data *dev = get_gadget_data (gadget); |
| 1674 | |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1675 | DBG (dev, "%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | |
| 1677 | spin_lock_irq (&dev->lock); |
| 1678 | dev->state = STATE_DEV_UNBOUND; |
| 1679 | spin_unlock_irq (&dev->lock); |
| 1680 | |
| 1681 | destroy_ep_files (dev); |
| 1682 | gadget->ep0->driver_data = NULL; |
| 1683 | set_gadget_data (gadget, NULL); |
| 1684 | |
| 1685 | /* we've already been disconnected ... no i/o is active */ |
| 1686 | if (dev->req) |
| 1687 | usb_ep_free_request (gadget->ep0, dev->req); |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1688 | DBG (dev, "%s done\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | put_dev (dev); |
| 1690 | } |
| 1691 | |
| 1692 | static struct dev_data *the_device; |
| 1693 | |
| 1694 | static int |
| 1695 | gadgetfs_bind (struct usb_gadget *gadget) |
| 1696 | { |
| 1697 | struct dev_data *dev = the_device; |
| 1698 | |
| 1699 | if (!dev) |
| 1700 | return -ESRCH; |
| 1701 | if (0 != strcmp (CHIP, gadget->name)) { |
David Brownell | 0027492 | 2007-11-19 12:58:36 -0800 | [diff] [blame] | 1702 | pr_err("%s expected %s controller not %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | shortname, CHIP, gadget->name); |
| 1704 | return -ENODEV; |
| 1705 | } |
| 1706 | |
| 1707 | set_gadget_data (gadget, dev); |
| 1708 | dev->gadget = gadget; |
| 1709 | gadget->ep0->driver_data = dev; |
| 1710 | dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket; |
| 1711 | |
| 1712 | /* preallocate control response and buffer */ |
| 1713 | dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL); |
| 1714 | if (!dev->req) |
| 1715 | goto enomem; |
| 1716 | dev->req->context = NULL; |
| 1717 | dev->req->complete = epio_complete; |
| 1718 | |
| 1719 | if (activate_ep_files (dev) < 0) |
| 1720 | goto enomem; |
| 1721 | |
| 1722 | INFO (dev, "bound to %s driver\n", gadget->name); |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1723 | spin_lock_irq(&dev->lock); |
| 1724 | dev->state = STATE_DEV_UNCONNECTED; |
| 1725 | spin_unlock_irq(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | get_dev (dev); |
| 1727 | return 0; |
| 1728 | |
| 1729 | enomem: |
| 1730 | gadgetfs_unbind (gadget); |
| 1731 | return -ENOMEM; |
| 1732 | } |
| 1733 | |
| 1734 | static void |
| 1735 | gadgetfs_disconnect (struct usb_gadget *gadget) |
| 1736 | { |
| 1737 | struct dev_data *dev = get_gadget_data (gadget); |
| 1738 | |
Milan Svoboda | 07cb7f2 | 2006-06-26 07:46:00 -0700 | [diff] [blame] | 1739 | spin_lock (&dev->lock); |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1740 | if (dev->state == STATE_DEV_UNCONNECTED) |
Milan Svoboda | 07cb7f2 | 2006-06-26 07:46:00 -0700 | [diff] [blame] | 1741 | goto exit; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1742 | dev->state = STATE_DEV_UNCONNECTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | |
| 1744 | INFO (dev, "disconnected\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | next_event (dev, GADGETFS_DISCONNECT); |
| 1746 | ep0_readable (dev); |
Milan Svoboda | 07cb7f2 | 2006-06-26 07:46:00 -0700 | [diff] [blame] | 1747 | exit: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | spin_unlock (&dev->lock); |
| 1749 | } |
| 1750 | |
| 1751 | static void |
| 1752 | gadgetfs_suspend (struct usb_gadget *gadget) |
| 1753 | { |
| 1754 | struct dev_data *dev = get_gadget_data (gadget); |
| 1755 | |
| 1756 | INFO (dev, "suspended from state %d\n", dev->state); |
| 1757 | spin_lock (&dev->lock); |
| 1758 | switch (dev->state) { |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1759 | case STATE_DEV_SETUP: // VERY odd... host died?? |
| 1760 | case STATE_DEV_CONNECTED: |
| 1761 | case STATE_DEV_UNCONNECTED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | next_event (dev, GADGETFS_SUSPEND); |
| 1763 | ep0_readable (dev); |
| 1764 | /* FALLTHROUGH */ |
| 1765 | default: |
| 1766 | break; |
| 1767 | } |
| 1768 | spin_unlock (&dev->lock); |
| 1769 | } |
| 1770 | |
| 1771 | static struct usb_gadget_driver gadgetfs_driver = { |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1772 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | .speed = USB_SPEED_HIGH, |
| 1774 | #else |
| 1775 | .speed = USB_SPEED_FULL, |
| 1776 | #endif |
| 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, |
| 1783 | |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 1784 | .driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | .name = (char *) shortname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | }, |
| 1787 | }; |
| 1788 | |
| 1789 | /*----------------------------------------------------------------------*/ |
| 1790 | |
| 1791 | static void gadgetfs_nop(struct usb_gadget *arg) { } |
| 1792 | |
| 1793 | static int gadgetfs_probe (struct usb_gadget *gadget) |
| 1794 | { |
| 1795 | CHIP = gadget->name; |
| 1796 | return -EISNAM; |
| 1797 | } |
| 1798 | |
| 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, |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 1805 | .driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | .name = "nop", |
| 1807 | }, |
| 1808 | }; |
| 1809 | |
| 1810 | |
| 1811 | /* DEVICE INITIALIZATION |
| 1812 | * |
| 1813 | * fd = open ("/dev/gadget/$CHIP", O_RDWR) |
| 1814 | * status = write (fd, descriptors, sizeof descriptors) |
| 1815 | * |
| 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: |
| 1819 | * |
| 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; |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 1825 | * this one's optional except for high-speed hardware |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | * . device descriptor |
| 1827 | * |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 1828 | * Endpoints are not yet enabled. Drivers must wait until device |
| 1829 | * configuration and interface altsetting changes create |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | * the need to configure (or unconfigure) them. |
| 1831 | * |
| 1832 | * After initialization, the device stays active for as long as that |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 1833 | * $CHIP file is open. Events must then be read from that descriptor, |
| 1834 | * such as configuration notifications. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | */ |
| 1836 | |
| 1837 | static int is_valid_config (struct usb_config_descriptor *config) |
| 1838 | { |
| 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 */ |
| 1846 | } |
| 1847 | |
| 1848 | static ssize_t |
| 1849 | dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 1850 | { |
| 1851 | struct dev_data *dev = fd->private_data; |
| 1852 | ssize_t value = len, length = len; |
| 1853 | unsigned total; |
| 1854 | u32 tag; |
| 1855 | char *kbuf; |
| 1856 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | if (len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4)) |
| 1858 | return -EINVAL; |
| 1859 | |
| 1860 | /* we might need to change message format someday */ |
| 1861 | if (copy_from_user (&tag, buf, 4)) |
| 1862 | return -EFAULT; |
| 1863 | if (tag != 0) |
| 1864 | return -EINVAL; |
| 1865 | buf += 4; |
| 1866 | length -= 4; |
| 1867 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 1868 | kbuf = kmalloc (length, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | if (!kbuf) |
| 1870 | return -ENOMEM; |
| 1871 | if (copy_from_user (kbuf, buf, length)) { |
| 1872 | kfree (kbuf); |
| 1873 | return -EFAULT; |
| 1874 | } |
| 1875 | |
| 1876 | spin_lock_irq (&dev->lock); |
| 1877 | value = -EINVAL; |
| 1878 | if (dev->buf) |
| 1879 | goto fail; |
| 1880 | dev->buf = kbuf; |
| 1881 | |
| 1882 | /* full or low speed config */ |
| 1883 | dev->config = (void *) kbuf; |
David Brownell | 01ee7d7 | 2007-05-25 20:40:14 -0700 | [diff] [blame] | 1884 | total = le16_to_cpu(dev->config->wTotalLength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | if (!is_valid_config (dev->config) || total >= length) |
| 1886 | goto fail; |
| 1887 | kbuf += total; |
| 1888 | length -= total; |
| 1889 | |
| 1890 | /* optional high speed config */ |
| 1891 | if (kbuf [1] == USB_DT_CONFIG) { |
| 1892 | dev->hs_config = (void *) kbuf; |
David Brownell | 01ee7d7 | 2007-05-25 20:40:14 -0700 | [diff] [blame] | 1893 | total = le16_to_cpu(dev->hs_config->wTotalLength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | if (!is_valid_config (dev->hs_config) || total >= length) |
| 1895 | goto fail; |
| 1896 | kbuf += total; |
| 1897 | length -= total; |
| 1898 | } |
| 1899 | |
| 1900 | /* could support multiple configs, using another encoding! */ |
| 1901 | |
| 1902 | /* device descriptor (tweaked for paranoia) */ |
| 1903 | if (length != USB_DT_DEVICE_SIZE) |
| 1904 | goto fail; |
| 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) |
| 1909 | goto fail; |
| 1910 | dev->dev->bNumConfigurations = 1; |
| 1911 | dev->dev->bcdUSB = __constant_cpu_to_le16 (0x0200); |
| 1912 | |
| 1913 | /* triggers gadgetfs_bind(); then we can enumerate. */ |
| 1914 | spin_unlock_irq (&dev->lock); |
| 1915 | value = usb_gadget_register_driver (&gadgetfs_driver); |
| 1916 | if (value != 0) { |
| 1917 | kfree (dev->buf); |
| 1918 | dev->buf = NULL; |
| 1919 | } else { |
| 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. |
| 1923 | * |
| 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. |
| 1928 | */ |
| 1929 | fd->f_op = &ep0_io_operations; |
| 1930 | value = len; |
| 1931 | } |
| 1932 | return value; |
| 1933 | |
| 1934 | fail: |
| 1935 | spin_unlock_irq (&dev->lock); |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1936 | pr_debug ("%s: %s fail %Zd, %p\n", shortname, __func__, value, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | kfree (dev->buf); |
| 1938 | dev->buf = NULL; |
| 1939 | return value; |
| 1940 | } |
| 1941 | |
| 1942 | static int |
| 1943 | dev_open (struct inode *inode, struct file *fd) |
| 1944 | { |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 1945 | struct dev_data *dev = inode->i_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | int value = -EBUSY; |
| 1947 | |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1948 | spin_lock_irq(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | if (dev->state == STATE_DEV_DISABLED) { |
| 1950 | dev->ev_next = 0; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1951 | dev->state = STATE_DEV_OPENED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | fd->private_data = dev; |
| 1953 | get_dev (dev); |
| 1954 | value = 0; |
| 1955 | } |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1956 | spin_unlock_irq(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | return value; |
| 1958 | } |
| 1959 | |
Luiz Fernando N. Capitulino | 066202d | 2006-08-05 20:37:11 -0300 | [diff] [blame] | 1960 | static const struct file_operations dev_init_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | .owner = THIS_MODULE, |
| 1962 | .llseek = no_llseek, |
| 1963 | |
| 1964 | .open = dev_open, |
| 1965 | .write = dev_config, |
| 1966 | .fasync = ep0_fasync, |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 1967 | .unlocked_ioctl = dev_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | .release = dev_release, |
| 1969 | }; |
| 1970 | |
| 1971 | /*----------------------------------------------------------------------*/ |
| 1972 | |
| 1973 | /* FILESYSTEM AND SUPERBLOCK OPERATIONS |
| 1974 | * |
| 1975 | * Mounting the filesystem creates a controller file, used first for |
| 1976 | * device configuration then later for event monitoring. |
| 1977 | */ |
| 1978 | |
| 1979 | |
| 1980 | /* FIXME PAM etc could set this security policy without mount options |
| 1981 | * if epfiles inherited ownership and permissons from ep0 ... |
| 1982 | */ |
| 1983 | |
| 1984 | static unsigned default_uid; |
| 1985 | static unsigned default_gid; |
| 1986 | static unsigned default_perm = S_IRUSR | S_IWUSR; |
| 1987 | |
| 1988 | module_param (default_uid, uint, 0644); |
| 1989 | module_param (default_gid, uint, 0644); |
| 1990 | module_param (default_perm, uint, 0644); |
| 1991 | |
| 1992 | |
| 1993 | static struct inode * |
| 1994 | gadgetfs_make_inode (struct super_block *sb, |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 1995 | void *data, const struct file_operations *fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1996 | int mode) |
| 1997 | { |
| 1998 | struct inode *inode = new_inode (sb); |
| 1999 | |
| 2000 | if (inode) { |
| 2001 | inode->i_mode = mode; |
| 2002 | inode->i_uid = default_uid; |
| 2003 | inode->i_gid = default_gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2004 | inode->i_blocks = 0; |
| 2005 | inode->i_atime = inode->i_mtime = inode->i_ctime |
| 2006 | = CURRENT_TIME; |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 2007 | inode->i_private = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | inode->i_fop = fops; |
| 2009 | } |
| 2010 | return inode; |
| 2011 | } |
| 2012 | |
| 2013 | /* creates in fs root directory, so non-renamable and non-linkable. |
| 2014 | * so inode and dentry are paired, until device reconfig. |
| 2015 | */ |
| 2016 | static struct inode * |
| 2017 | gadgetfs_create_file (struct super_block *sb, char const *name, |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 2018 | void *data, const struct file_operations *fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | struct dentry **dentry_p) |
| 2020 | { |
| 2021 | struct dentry *dentry; |
| 2022 | struct inode *inode; |
| 2023 | |
| 2024 | dentry = d_alloc_name(sb->s_root, name); |
| 2025 | if (!dentry) |
| 2026 | return NULL; |
| 2027 | |
| 2028 | inode = gadgetfs_make_inode (sb, data, fops, |
| 2029 | S_IFREG | (default_perm & S_IRWXUGO)); |
| 2030 | if (!inode) { |
| 2031 | dput(dentry); |
| 2032 | return NULL; |
| 2033 | } |
| 2034 | d_add (dentry, inode); |
| 2035 | *dentry_p = dentry; |
| 2036 | return inode; |
| 2037 | } |
| 2038 | |
| 2039 | static struct super_operations gadget_fs_operations = { |
| 2040 | .statfs = simple_statfs, |
| 2041 | .drop_inode = generic_delete_inode, |
| 2042 | }; |
| 2043 | |
| 2044 | static int |
| 2045 | gadgetfs_fill_super (struct super_block *sb, void *opts, int silent) |
| 2046 | { |
| 2047 | struct inode *inode; |
| 2048 | struct dentry *d; |
| 2049 | struct dev_data *dev; |
| 2050 | |
| 2051 | if (the_device) |
| 2052 | return -ESRCH; |
| 2053 | |
| 2054 | /* fake probe to determine $CHIP */ |
| 2055 | (void) usb_gadget_register_driver (&probe_driver); |
| 2056 | if (!CHIP) |
| 2057 | return -ENODEV; |
| 2058 | |
| 2059 | /* superblock */ |
| 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; |
| 2065 | |
| 2066 | /* root inode */ |
| 2067 | inode = gadgetfs_make_inode (sb, |
| 2068 | NULL, &simple_dir_operations, |
| 2069 | S_IFDIR | S_IRUGO | S_IXUGO); |
| 2070 | if (!inode) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2071 | goto enomem0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | inode->i_op = &simple_dir_inode_operations; |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2073 | if (!(d = d_alloc_root (inode))) |
| 2074 | goto enomem1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | sb->s_root = d; |
| 2076 | |
| 2077 | /* the ep0 file is named after the controller we expect; |
| 2078 | * user mode code can use it for sanity checks, like we do. |
| 2079 | */ |
| 2080 | dev = dev_new (); |
| 2081 | if (!dev) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2082 | goto enomem2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | |
| 2084 | dev->sb = sb; |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2085 | if (!gadgetfs_create_file (sb, CHIP, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | dev, &dev_init_operations, |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2087 | &dev->dentry)) |
| 2088 | goto enomem3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | |
| 2090 | /* other endpoint files are available after hardware setup, |
| 2091 | * from binding to a controller. |
| 2092 | */ |
| 2093 | the_device = dev; |
| 2094 | return 0; |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2095 | |
| 2096 | enomem3: |
| 2097 | put_dev (dev); |
| 2098 | enomem2: |
| 2099 | dput (d); |
| 2100 | enomem1: |
| 2101 | iput (inode); |
| 2102 | enomem0: |
| 2103 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | } |
| 2105 | |
| 2106 | /* "mount -t gadgetfs path /dev/gadget" ends up here */ |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 2107 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | gadgetfs_get_sb (struct file_system_type *t, int flags, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 2109 | const char *path, void *opts, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 2111 | return get_sb_single (t, flags, opts, gadgetfs_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | } |
| 2113 | |
| 2114 | static void |
| 2115 | gadgetfs_kill_sb (struct super_block *sb) |
| 2116 | { |
| 2117 | kill_litter_super (sb); |
| 2118 | if (the_device) { |
| 2119 | put_dev (the_device); |
| 2120 | the_device = NULL; |
| 2121 | } |
| 2122 | } |
| 2123 | |
| 2124 | /*----------------------------------------------------------------------*/ |
| 2125 | |
| 2126 | static struct file_system_type gadgetfs_type = { |
| 2127 | .owner = THIS_MODULE, |
| 2128 | .name = shortname, |
| 2129 | .get_sb = gadgetfs_get_sb, |
| 2130 | .kill_sb = gadgetfs_kill_sb, |
| 2131 | }; |
| 2132 | |
| 2133 | /*----------------------------------------------------------------------*/ |
| 2134 | |
| 2135 | static int __init init (void) |
| 2136 | { |
| 2137 | int status; |
| 2138 | |
| 2139 | status = register_filesystem (&gadgetfs_type); |
| 2140 | if (status == 0) |
| 2141 | pr_info ("%s: %s, version " DRIVER_VERSION "\n", |
| 2142 | shortname, driver_desc); |
| 2143 | return status; |
| 2144 | } |
| 2145 | module_init (init); |
| 2146 | |
| 2147 | static void __exit cleanup (void) |
| 2148 | { |
| 2149 | pr_debug ("unregister %s\n", shortname); |
| 2150 | unregister_filesystem (&gadgetfs_type); |
| 2151 | } |
| 2152 | module_exit (cleanup); |
| 2153 | |