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 | |
| 23 | // #define DEBUG /* data to help fault diagnosis */ |
| 24 | // #define VERBOSE /* extra debug messages (success too) */ |
| 25 | |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/fs.h> |
| 29 | #include <linux/pagemap.h> |
| 30 | #include <linux/uts.h> |
| 31 | #include <linux/wait.h> |
| 32 | #include <linux/compiler.h> |
| 33 | #include <asm/uaccess.h> |
| 34 | #include <linux/slab.h> |
Milan Svoboda | e22fc27 | 2006-08-08 22:23:12 -0700 | [diff] [blame] | 35 | #include <linux/poll.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 | |
| 40 | #include <linux/usb_gadgetfs.h> |
| 41 | #include <linux/usb_gadget.h> |
| 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/$CHIP is configured |
| 58 | * (by writing configuration and device descriptors). Afterwards it |
| 59 | * may serve as a source of device events, used to handle all control |
| 60 | * requests other than basic enumeration. |
| 61 | * |
| 62 | * - Then either immediately, or after a SET_CONFIGURATION control request, |
| 63 | * ep_config() is called when each /dev/gadget/ep* file is configured |
| 64 | * (by writing endpoint descriptors). Afterwards these files are used |
| 65 | * to write() IN data or to read() OUT data. To halt the endpoint, a |
| 66 | * "wrong direction" request is issued (like reading an IN endpoint). |
| 67 | * |
| 68 | * Unlike "usbfs" the only ioctl()s are for things that are rare, and maybe |
| 69 | * not possible on all hardware. For example, precise fault handling with |
| 70 | * respect to data left in endpoint fifos after aborted operations; or |
| 71 | * selective clearing of endpoint halts, to implement SET_INTERFACE. |
| 72 | */ |
| 73 | |
| 74 | #define DRIVER_DESC "USB Gadget filesystem" |
| 75 | #define DRIVER_VERSION "24 Aug 2004" |
| 76 | |
| 77 | static const char driver_desc [] = DRIVER_DESC; |
| 78 | static const char shortname [] = "gadgetfs"; |
| 79 | |
| 80 | MODULE_DESCRIPTION (DRIVER_DESC); |
| 81 | MODULE_AUTHOR ("David Brownell"); |
| 82 | MODULE_LICENSE ("GPL"); |
| 83 | |
| 84 | |
| 85 | /*----------------------------------------------------------------------*/ |
| 86 | |
| 87 | #define GADGETFS_MAGIC 0xaee71ee7 |
| 88 | #define DMA_ADDR_INVALID (~(dma_addr_t)0) |
| 89 | |
| 90 | /* /dev/gadget/$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 | */ |
| 101 | STATE_OPENED, |
| 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 | */ |
| 108 | STATE_UNCONNECTED, |
| 109 | STATE_CONNECTED, |
| 110 | STATE_SETUP, |
| 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; |
| 124 | enum ep0_state state; |
| 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, |
| 191 | STATE_EP_DEFER_ENABLE, |
| 192 | STATE_EP_ENABLED, |
| 193 | STATE_EP_UNBOUND, |
| 194 | }; |
| 195 | |
| 196 | struct ep_data { |
| 197 | struct semaphore lock; |
| 198 | enum ep_state state; |
| 199 | atomic_t count; |
| 200 | struct dev_data *dev; |
| 201 | /* must hold dev->lock before accessing ep or req */ |
| 202 | struct usb_ep *ep; |
| 203 | struct usb_request *req; |
| 204 | ssize_t status; |
| 205 | char name [16]; |
| 206 | struct usb_endpoint_descriptor desc, hs_desc; |
| 207 | struct list_head epfiles; |
| 208 | wait_queue_head_t wait; |
| 209 | struct dentry *dentry; |
| 210 | struct inode *inode; |
| 211 | }; |
| 212 | |
| 213 | static inline void get_ep (struct ep_data *data) |
| 214 | { |
| 215 | atomic_inc (&data->count); |
| 216 | } |
| 217 | |
| 218 | static void put_ep (struct ep_data *data) |
| 219 | { |
| 220 | if (likely (!atomic_dec_and_test (&data->count))) |
| 221 | return; |
| 222 | put_dev (data->dev); |
| 223 | /* needs no more cleanup */ |
| 224 | BUG_ON (!list_empty (&data->epfiles)); |
| 225 | BUG_ON (waitqueue_active (&data->wait)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | kfree (data); |
| 227 | } |
| 228 | |
| 229 | /*----------------------------------------------------------------------*/ |
| 230 | |
| 231 | /* most "how to use the hardware" policy choices are in userspace: |
| 232 | * mapping endpoint roles (which the driver needs) to the capabilities |
| 233 | * which the usb controller has. most of those capabilities are exposed |
| 234 | * implicitly, starting with the driver name and then endpoint names. |
| 235 | */ |
| 236 | |
| 237 | static const char *CHIP; |
| 238 | |
| 239 | /*----------------------------------------------------------------------*/ |
| 240 | |
| 241 | /* NOTE: don't use dev_printk calls before binding to the gadget |
| 242 | * at the end of ep0 configuration, or after unbind. |
| 243 | */ |
| 244 | |
| 245 | /* too wordy: dev_printk(level , &(d)->gadget->dev , fmt , ## args) */ |
| 246 | #define xprintk(d,level,fmt,args...) \ |
| 247 | printk(level "%s: " fmt , shortname , ## args) |
| 248 | |
| 249 | #ifdef DEBUG |
| 250 | #define DBG(dev,fmt,args...) \ |
| 251 | xprintk(dev , KERN_DEBUG , fmt , ## args) |
| 252 | #else |
| 253 | #define DBG(dev,fmt,args...) \ |
| 254 | do { } while (0) |
| 255 | #endif /* DEBUG */ |
| 256 | |
| 257 | #ifdef VERBOSE |
| 258 | #define VDEBUG DBG |
| 259 | #else |
| 260 | #define VDEBUG(dev,fmt,args...) \ |
| 261 | do { } while (0) |
| 262 | #endif /* DEBUG */ |
| 263 | |
| 264 | #define ERROR(dev,fmt,args...) \ |
| 265 | xprintk(dev , KERN_ERR , fmt , ## args) |
| 266 | #define WARN(dev,fmt,args...) \ |
| 267 | xprintk(dev , KERN_WARNING , fmt , ## args) |
| 268 | #define INFO(dev,fmt,args...) \ |
| 269 | xprintk(dev , KERN_INFO , fmt , ## args) |
| 270 | |
| 271 | |
| 272 | /*----------------------------------------------------------------------*/ |
| 273 | |
| 274 | /* SYNCHRONOUS ENDPOINT OPERATIONS (bulk/intr/iso) |
| 275 | * |
| 276 | * After opening, configure non-control endpoints. Then use normal |
| 277 | * stream read() and write() requests; and maybe ioctl() to get more |
Steven Cole | 093cf72 | 2005-05-03 19:07:24 -0600 | [diff] [blame] | 278 | * precise FIFO status when recovering from cancellation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | */ |
| 280 | |
| 281 | static void epio_complete (struct usb_ep *ep, struct usb_request *req) |
| 282 | { |
| 283 | struct ep_data *epdata = ep->driver_data; |
| 284 | |
| 285 | if (!req->context) |
| 286 | return; |
| 287 | if (req->status) |
| 288 | epdata->status = req->status; |
| 289 | else |
| 290 | epdata->status = req->actual; |
| 291 | complete ((struct completion *)req->context); |
| 292 | } |
| 293 | |
| 294 | /* tasklock endpoint, returning when it's connected. |
| 295 | * still need dev->lock to use epdata->ep. |
| 296 | */ |
| 297 | static int |
| 298 | get_ready_ep (unsigned f_flags, struct ep_data *epdata) |
| 299 | { |
| 300 | int val; |
| 301 | |
| 302 | if (f_flags & O_NONBLOCK) { |
| 303 | if (down_trylock (&epdata->lock) != 0) |
| 304 | goto nonblock; |
| 305 | if (epdata->state != STATE_EP_ENABLED) { |
| 306 | up (&epdata->lock); |
| 307 | nonblock: |
| 308 | val = -EAGAIN; |
| 309 | } else |
| 310 | val = 0; |
| 311 | return val; |
| 312 | } |
| 313 | |
| 314 | if ((val = down_interruptible (&epdata->lock)) < 0) |
| 315 | return val; |
| 316 | newstate: |
| 317 | switch (epdata->state) { |
| 318 | case STATE_EP_ENABLED: |
| 319 | break; |
| 320 | case STATE_EP_DEFER_ENABLE: |
| 321 | DBG (epdata->dev, "%s wait for host\n", epdata->name); |
| 322 | if ((val = wait_event_interruptible (epdata->wait, |
| 323 | epdata->state != STATE_EP_DEFER_ENABLE |
| 324 | || epdata->dev->state == STATE_DEV_UNBOUND |
| 325 | )) < 0) |
| 326 | goto fail; |
| 327 | goto newstate; |
| 328 | // case STATE_EP_DISABLED: /* "can't happen" */ |
| 329 | // case STATE_EP_READY: /* "can't happen" */ |
| 330 | default: /* error! */ |
| 331 | pr_debug ("%s: ep %p not available, state %d\n", |
| 332 | shortname, epdata, epdata->state); |
| 333 | // FALLTHROUGH |
| 334 | case STATE_EP_UNBOUND: /* clean disconnect */ |
| 335 | val = -ENODEV; |
| 336 | fail: |
| 337 | up (&epdata->lock); |
| 338 | } |
| 339 | return val; |
| 340 | } |
| 341 | |
| 342 | static ssize_t |
| 343 | ep_io (struct ep_data *epdata, void *buf, unsigned len) |
| 344 | { |
Peter Zijlstra | 6e9a473 | 2006-09-30 23:28:10 -0700 | [diff] [blame] | 345 | DECLARE_COMPLETION_ONSTACK (done); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | int value; |
| 347 | |
| 348 | spin_lock_irq (&epdata->dev->lock); |
| 349 | if (likely (epdata->ep != NULL)) { |
| 350 | struct usb_request *req = epdata->req; |
| 351 | |
| 352 | req->context = &done; |
| 353 | req->complete = epio_complete; |
| 354 | req->buf = buf; |
| 355 | req->length = len; |
| 356 | value = usb_ep_queue (epdata->ep, req, GFP_ATOMIC); |
| 357 | } else |
| 358 | value = -ENODEV; |
| 359 | spin_unlock_irq (&epdata->dev->lock); |
| 360 | |
| 361 | if (likely (value == 0)) { |
| 362 | value = wait_event_interruptible (done.wait, done.done); |
| 363 | if (value != 0) { |
| 364 | spin_lock_irq (&epdata->dev->lock); |
| 365 | if (likely (epdata->ep != NULL)) { |
| 366 | DBG (epdata->dev, "%s i/o interrupted\n", |
| 367 | epdata->name); |
| 368 | usb_ep_dequeue (epdata->ep, epdata->req); |
| 369 | spin_unlock_irq (&epdata->dev->lock); |
| 370 | |
| 371 | wait_event (done.wait, done.done); |
| 372 | if (epdata->status == -ECONNRESET) |
| 373 | epdata->status = -EINTR; |
| 374 | } else { |
| 375 | spin_unlock_irq (&epdata->dev->lock); |
| 376 | |
| 377 | DBG (epdata->dev, "endpoint gone\n"); |
| 378 | epdata->status = -ENODEV; |
| 379 | } |
| 380 | } |
| 381 | return epdata->status; |
| 382 | } |
| 383 | return value; |
| 384 | } |
| 385 | |
| 386 | |
| 387 | /* handle a synchronous OUT bulk/intr/iso transfer */ |
| 388 | static ssize_t |
| 389 | ep_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr) |
| 390 | { |
| 391 | struct ep_data *data = fd->private_data; |
| 392 | void *kbuf; |
| 393 | ssize_t value; |
| 394 | |
| 395 | if ((value = get_ready_ep (fd->f_flags, data)) < 0) |
| 396 | return value; |
| 397 | |
| 398 | /* halt any endpoint by doing a "wrong direction" i/o call */ |
| 399 | if (data->desc.bEndpointAddress & USB_DIR_IN) { |
| 400 | if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) |
| 401 | == USB_ENDPOINT_XFER_ISOC) |
| 402 | return -EINVAL; |
| 403 | DBG (data->dev, "%s halt\n", data->name); |
| 404 | spin_lock_irq (&data->dev->lock); |
| 405 | if (likely (data->ep != NULL)) |
| 406 | usb_ep_set_halt (data->ep); |
| 407 | spin_unlock_irq (&data->dev->lock); |
| 408 | up (&data->lock); |
| 409 | return -EBADMSG; |
| 410 | } |
| 411 | |
| 412 | /* FIXME readahead for O_NONBLOCK and poll(); careful with ZLPs */ |
| 413 | |
| 414 | value = -ENOMEM; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 415 | kbuf = kmalloc (len, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | if (unlikely (!kbuf)) |
| 417 | goto free1; |
| 418 | |
| 419 | value = ep_io (data, kbuf, len); |
David Brownell | 1bbc169 | 2005-05-07 13:05:13 -0700 | [diff] [blame] | 420 | VDEBUG (data->dev, "%s read %zu OUT, status %d\n", |
| 421 | data->name, len, (int) value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | if (value >= 0 && copy_to_user (buf, kbuf, value)) |
| 423 | value = -EFAULT; |
| 424 | |
| 425 | free1: |
| 426 | up (&data->lock); |
| 427 | kfree (kbuf); |
| 428 | return value; |
| 429 | } |
| 430 | |
| 431 | /* handle a synchronous IN bulk/intr/iso transfer */ |
| 432 | static ssize_t |
| 433 | ep_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 434 | { |
| 435 | struct ep_data *data = fd->private_data; |
| 436 | void *kbuf; |
| 437 | ssize_t value; |
| 438 | |
| 439 | if ((value = get_ready_ep (fd->f_flags, data)) < 0) |
| 440 | return value; |
| 441 | |
| 442 | /* halt any endpoint by doing a "wrong direction" i/o call */ |
| 443 | if (!(data->desc.bEndpointAddress & USB_DIR_IN)) { |
| 444 | if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) |
| 445 | == USB_ENDPOINT_XFER_ISOC) |
| 446 | return -EINVAL; |
| 447 | DBG (data->dev, "%s halt\n", data->name); |
| 448 | spin_lock_irq (&data->dev->lock); |
| 449 | if (likely (data->ep != NULL)) |
| 450 | usb_ep_set_halt (data->ep); |
| 451 | spin_unlock_irq (&data->dev->lock); |
| 452 | up (&data->lock); |
| 453 | return -EBADMSG; |
| 454 | } |
| 455 | |
| 456 | /* FIXME writebehind for O_NONBLOCK and poll(), qlen = 1 */ |
| 457 | |
| 458 | value = -ENOMEM; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 459 | kbuf = kmalloc (len, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | if (!kbuf) |
| 461 | goto free1; |
| 462 | if (copy_from_user (kbuf, buf, len)) { |
| 463 | value = -EFAULT; |
| 464 | goto free1; |
| 465 | } |
| 466 | |
| 467 | value = ep_io (data, kbuf, len); |
David Brownell | 1bbc169 | 2005-05-07 13:05:13 -0700 | [diff] [blame] | 468 | VDEBUG (data->dev, "%s write %zu IN, status %d\n", |
| 469 | data->name, len, (int) value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | free1: |
| 471 | up (&data->lock); |
| 472 | kfree (kbuf); |
| 473 | return value; |
| 474 | } |
| 475 | |
| 476 | static int |
| 477 | ep_release (struct inode *inode, struct file *fd) |
| 478 | { |
| 479 | struct ep_data *data = fd->private_data; |
Milan Svoboda | ba307f5 | 2006-06-26 07:48:00 -0700 | [diff] [blame] | 480 | int value; |
| 481 | |
| 482 | if ((value = down_interruptible(&data->lock)) < 0) |
| 483 | return value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
| 485 | /* clean up if this can be reopened */ |
| 486 | if (data->state != STATE_EP_UNBOUND) { |
| 487 | data->state = STATE_EP_DISABLED; |
| 488 | data->desc.bDescriptorType = 0; |
| 489 | data->hs_desc.bDescriptorType = 0; |
Pavol Kurina | 4809ecc | 2005-09-07 09:49:34 -0700 | [diff] [blame] | 490 | usb_ep_disable(data->ep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | } |
Milan Svoboda | ba307f5 | 2006-06-26 07:48:00 -0700 | [diff] [blame] | 492 | up (&data->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | put_ep (data); |
| 494 | return 0; |
| 495 | } |
| 496 | |
| 497 | static int ep_ioctl (struct inode *inode, struct file *fd, |
| 498 | unsigned code, unsigned long value) |
| 499 | { |
| 500 | struct ep_data *data = fd->private_data; |
| 501 | int status; |
| 502 | |
| 503 | if ((status = get_ready_ep (fd->f_flags, data)) < 0) |
| 504 | return status; |
| 505 | |
| 506 | spin_lock_irq (&data->dev->lock); |
| 507 | if (likely (data->ep != NULL)) { |
| 508 | switch (code) { |
| 509 | case GADGETFS_FIFO_STATUS: |
| 510 | status = usb_ep_fifo_status (data->ep); |
| 511 | break; |
| 512 | case GADGETFS_FIFO_FLUSH: |
| 513 | usb_ep_fifo_flush (data->ep); |
| 514 | break; |
| 515 | case GADGETFS_CLEAR_HALT: |
| 516 | status = usb_ep_clear_halt (data->ep); |
| 517 | break; |
| 518 | default: |
| 519 | status = -ENOTTY; |
| 520 | } |
| 521 | } else |
| 522 | status = -ENODEV; |
| 523 | spin_unlock_irq (&data->dev->lock); |
| 524 | up (&data->lock); |
| 525 | return status; |
| 526 | } |
| 527 | |
| 528 | /*----------------------------------------------------------------------*/ |
| 529 | |
| 530 | /* ASYNCHRONOUS ENDPOINT I/O OPERATIONS (bulk/intr/iso) */ |
| 531 | |
| 532 | struct kiocb_priv { |
| 533 | struct usb_request *req; |
| 534 | struct ep_data *epdata; |
| 535 | void *buf; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 536 | const struct iovec *iv; |
| 537 | unsigned long nr_segs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | unsigned actual; |
| 539 | }; |
| 540 | |
| 541 | static int ep_aio_cancel(struct kiocb *iocb, struct io_event *e) |
| 542 | { |
| 543 | struct kiocb_priv *priv = iocb->private; |
| 544 | struct ep_data *epdata; |
| 545 | int value; |
| 546 | |
| 547 | local_irq_disable(); |
| 548 | epdata = priv->epdata; |
| 549 | // spin_lock(&epdata->dev->lock); |
| 550 | kiocbSetCancelled(iocb); |
| 551 | if (likely(epdata && epdata->ep && priv->req)) |
| 552 | value = usb_ep_dequeue (epdata->ep, priv->req); |
| 553 | else |
| 554 | value = -EINVAL; |
| 555 | // spin_unlock(&epdata->dev->lock); |
| 556 | local_irq_enable(); |
| 557 | |
| 558 | aio_put_req(iocb); |
| 559 | return value; |
| 560 | } |
| 561 | |
| 562 | static ssize_t ep_aio_read_retry(struct kiocb *iocb) |
| 563 | { |
| 564 | struct kiocb_priv *priv = iocb->private; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 565 | ssize_t len, total; |
| 566 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 568 | /* we "retry" to get the right mm context for this: */ |
| 569 | |
| 570 | /* copy stuff into user buffers */ |
| 571 | total = priv->actual; |
| 572 | len = 0; |
| 573 | for (i=0; i < priv->nr_segs; i++) { |
| 574 | ssize_t this = min((ssize_t)(priv->iv[i].iov_len), total); |
| 575 | |
| 576 | if (copy_to_user(priv->iv[i].iov_base, priv->buf, this)) { |
| 577 | if (len == 0) |
| 578 | len = -EFAULT; |
| 579 | break; |
| 580 | } |
| 581 | |
| 582 | total -= this; |
| 583 | len += this; |
| 584 | if (total == 0) |
| 585 | break; |
| 586 | } |
| 587 | kfree(priv->buf); |
| 588 | kfree(priv); |
| 589 | aio_put_req(iocb); |
| 590 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | } |
| 592 | |
| 593 | static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req) |
| 594 | { |
| 595 | struct kiocb *iocb = req->context; |
| 596 | struct kiocb_priv *priv = iocb->private; |
| 597 | struct ep_data *epdata = priv->epdata; |
| 598 | |
| 599 | /* lock against disconnect (and ideally, cancel) */ |
| 600 | spin_lock(&epdata->dev->lock); |
| 601 | priv->req = NULL; |
| 602 | priv->epdata = NULL; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 603 | if (priv->iv == NULL |
Alan Stern | 83196b5 | 2006-05-22 12:26:31 -0400 | [diff] [blame] | 604 | || unlikely(req->actual == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | || unlikely(kiocbIsCancelled(iocb))) { |
| 606 | kfree(req->buf); |
| 607 | kfree(priv); |
| 608 | iocb->private = NULL; |
| 609 | /* aio_complete() reports bytes-transferred _and_ faults */ |
| 610 | if (unlikely(kiocbIsCancelled(iocb))) |
| 611 | aio_put_req(iocb); |
| 612 | else |
| 613 | aio_complete(iocb, |
| 614 | req->actual ? req->actual : req->status, |
| 615 | req->status); |
| 616 | } else { |
| 617 | /* retry() won't report both; so we hide some faults */ |
| 618 | if (unlikely(0 != req->status)) |
| 619 | DBG(epdata->dev, "%s fault %d len %d\n", |
| 620 | ep->name, req->status, req->actual); |
| 621 | |
| 622 | priv->buf = req->buf; |
| 623 | priv->actual = req->actual; |
| 624 | kick_iocb(iocb); |
| 625 | } |
| 626 | spin_unlock(&epdata->dev->lock); |
| 627 | |
| 628 | usb_ep_free_request(ep, req); |
| 629 | put_ep(epdata); |
| 630 | } |
| 631 | |
| 632 | static ssize_t |
| 633 | ep_aio_rwtail( |
| 634 | struct kiocb *iocb, |
| 635 | char *buf, |
| 636 | size_t len, |
| 637 | struct ep_data *epdata, |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 638 | const struct iovec *iv, |
| 639 | unsigned long nr_segs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | ) |
| 641 | { |
Alan Stern | 83196b5 | 2006-05-22 12:26:31 -0400 | [diff] [blame] | 642 | struct kiocb_priv *priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | struct usb_request *req; |
| 644 | ssize_t value; |
| 645 | |
| 646 | priv = kmalloc(sizeof *priv, GFP_KERNEL); |
| 647 | if (!priv) { |
| 648 | value = -ENOMEM; |
| 649 | fail: |
| 650 | kfree(buf); |
| 651 | return value; |
| 652 | } |
| 653 | iocb->private = priv; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 654 | priv->iv = iv; |
| 655 | priv->nr_segs = nr_segs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
| 657 | value = get_ready_ep(iocb->ki_filp->f_flags, epdata); |
| 658 | if (unlikely(value < 0)) { |
| 659 | kfree(priv); |
| 660 | goto fail; |
| 661 | } |
| 662 | |
| 663 | iocb->ki_cancel = ep_aio_cancel; |
| 664 | get_ep(epdata); |
| 665 | priv->epdata = epdata; |
| 666 | priv->actual = 0; |
| 667 | |
| 668 | /* each kiocb is coupled to one usb_request, but we can't |
| 669 | * allocate or submit those if the host disconnected. |
| 670 | */ |
| 671 | spin_lock_irq(&epdata->dev->lock); |
| 672 | if (likely(epdata->ep)) { |
| 673 | req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC); |
| 674 | if (likely(req)) { |
| 675 | priv->req = req; |
| 676 | req->buf = buf; |
| 677 | req->length = len; |
| 678 | req->complete = ep_aio_complete; |
| 679 | req->context = iocb; |
| 680 | value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC); |
| 681 | if (unlikely(0 != value)) |
| 682 | usb_ep_free_request(epdata->ep, req); |
| 683 | } else |
| 684 | value = -EAGAIN; |
| 685 | } else |
| 686 | value = -ENODEV; |
| 687 | spin_unlock_irq(&epdata->dev->lock); |
| 688 | |
| 689 | up(&epdata->lock); |
| 690 | |
| 691 | if (unlikely(value)) { |
| 692 | kfree(priv); |
| 693 | put_ep(epdata); |
| 694 | } else |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 695 | value = (iv ? -EIOCBRETRY : -EIOCBQUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | return value; |
| 697 | } |
| 698 | |
| 699 | static ssize_t |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 700 | ep_aio_read(struct kiocb *iocb, const struct iovec *iov, |
| 701 | unsigned long nr_segs, loff_t o) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
| 703 | struct ep_data *epdata = iocb->ki_filp->private_data; |
| 704 | char *buf; |
| 705 | |
| 706 | if (unlikely(epdata->desc.bEndpointAddress & USB_DIR_IN)) |
| 707 | return -EINVAL; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 708 | |
| 709 | buf = kmalloc(iocb->ki_left, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | if (unlikely(!buf)) |
| 711 | return -ENOMEM; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 712 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | iocb->ki_retry = ep_aio_read_retry; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 714 | 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] | 715 | } |
| 716 | |
| 717 | static ssize_t |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 718 | ep_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 719 | unsigned long nr_segs, loff_t o) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | { |
| 721 | struct ep_data *epdata = iocb->ki_filp->private_data; |
| 722 | char *buf; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 723 | size_t len = 0; |
| 724 | int i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
| 726 | if (unlikely(!(epdata->desc.bEndpointAddress & USB_DIR_IN))) |
| 727 | return -EINVAL; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 728 | |
| 729 | buf = kmalloc(iocb->ki_left, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | if (unlikely(!buf)) |
| 731 | return -ENOMEM; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 732 | |
| 733 | for (i=0; i < nr_segs; i++) { |
| 734 | if (unlikely(copy_from_user(&buf[len], iov[i].iov_base, |
| 735 | iov[i].iov_len) != 0)) { |
| 736 | kfree(buf); |
| 737 | return -EFAULT; |
| 738 | } |
| 739 | len += iov[i].iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | } |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 741 | return ep_aio_rwtail(iocb, buf, len, epdata, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
| 743 | |
| 744 | /*----------------------------------------------------------------------*/ |
| 745 | |
| 746 | /* used after endpoint configuration */ |
Luiz Fernando N. Capitulino | 066202d | 2006-08-05 20:37:11 -0300 | [diff] [blame] | 747 | static const struct file_operations ep_io_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | .owner = THIS_MODULE, |
| 749 | .llseek = no_llseek, |
| 750 | |
| 751 | .read = ep_read, |
| 752 | .write = ep_write, |
| 753 | .ioctl = ep_ioctl, |
| 754 | .release = ep_release, |
| 755 | |
| 756 | .aio_read = ep_aio_read, |
| 757 | .aio_write = ep_aio_write, |
| 758 | }; |
| 759 | |
| 760 | /* ENDPOINT INITIALIZATION |
| 761 | * |
| 762 | * fd = open ("/dev/gadget/$ENDPOINT", O_RDWR) |
| 763 | * status = write (fd, descriptors, sizeof descriptors) |
| 764 | * |
| 765 | * That write establishes the endpoint configuration, configuring |
| 766 | * the controller to process bulk, interrupt, or isochronous transfers |
| 767 | * at the right maxpacket size, and so on. |
| 768 | * |
| 769 | * The descriptors are message type 1, identified by a host order u32 |
| 770 | * at the beginning of what's written. Descriptor order is: full/low |
| 771 | * speed descriptor, then optional high speed descriptor. |
| 772 | */ |
| 773 | static ssize_t |
| 774 | ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 775 | { |
| 776 | struct ep_data *data = fd->private_data; |
| 777 | struct usb_ep *ep; |
| 778 | u32 tag; |
Milan Svoboda | 8a7471a | 2006-06-26 07:19:00 -0700 | [diff] [blame] | 779 | int value, length = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
| 781 | if ((value = down_interruptible (&data->lock)) < 0) |
| 782 | return value; |
| 783 | |
| 784 | if (data->state != STATE_EP_READY) { |
| 785 | value = -EL2HLT; |
| 786 | goto fail; |
| 787 | } |
| 788 | |
| 789 | value = len; |
| 790 | if (len < USB_DT_ENDPOINT_SIZE + 4) |
| 791 | goto fail0; |
| 792 | |
| 793 | /* we might need to change message format someday */ |
| 794 | if (copy_from_user (&tag, buf, 4)) { |
| 795 | goto fail1; |
| 796 | } |
| 797 | if (tag != 1) { |
| 798 | DBG(data->dev, "config %s, bad tag %d\n", data->name, tag); |
| 799 | goto fail0; |
| 800 | } |
| 801 | buf += 4; |
| 802 | len -= 4; |
| 803 | |
| 804 | /* NOTE: audio endpoint extensions not accepted here; |
| 805 | * just don't include the extra bytes. |
| 806 | */ |
| 807 | |
| 808 | /* full/low speed descriptor, then high speed */ |
| 809 | if (copy_from_user (&data->desc, buf, USB_DT_ENDPOINT_SIZE)) { |
| 810 | goto fail1; |
| 811 | } |
| 812 | if (data->desc.bLength != USB_DT_ENDPOINT_SIZE |
| 813 | || data->desc.bDescriptorType != USB_DT_ENDPOINT) |
| 814 | goto fail0; |
| 815 | if (len != USB_DT_ENDPOINT_SIZE) { |
| 816 | if (len != 2 * USB_DT_ENDPOINT_SIZE) |
| 817 | goto fail0; |
| 818 | if (copy_from_user (&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE, |
| 819 | USB_DT_ENDPOINT_SIZE)) { |
| 820 | goto fail1; |
| 821 | } |
| 822 | if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE |
| 823 | || data->hs_desc.bDescriptorType |
| 824 | != USB_DT_ENDPOINT) { |
| 825 | DBG(data->dev, "config %s, bad hs length or type\n", |
| 826 | data->name); |
| 827 | goto fail0; |
| 828 | } |
| 829 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
| 831 | spin_lock_irq (&data->dev->lock); |
| 832 | if (data->dev->state == STATE_DEV_UNBOUND) { |
| 833 | value = -ENOENT; |
| 834 | goto gone; |
| 835 | } else if ((ep = data->ep) == NULL) { |
| 836 | value = -ENODEV; |
| 837 | goto gone; |
| 838 | } |
| 839 | switch (data->dev->gadget->speed) { |
| 840 | case USB_SPEED_LOW: |
| 841 | case USB_SPEED_FULL: |
| 842 | value = usb_ep_enable (ep, &data->desc); |
| 843 | if (value == 0) |
| 844 | data->state = STATE_EP_ENABLED; |
| 845 | break; |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 846 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | case USB_SPEED_HIGH: |
| 848 | /* fails if caller didn't provide that descriptor... */ |
| 849 | value = usb_ep_enable (ep, &data->hs_desc); |
| 850 | if (value == 0) |
| 851 | data->state = STATE_EP_ENABLED; |
| 852 | break; |
| 853 | #endif |
| 854 | default: |
| 855 | DBG (data->dev, "unconnected, %s init deferred\n", |
| 856 | data->name); |
| 857 | data->state = STATE_EP_DEFER_ENABLE; |
| 858 | } |
Milan Svoboda | 8a7471a | 2006-06-26 07:19:00 -0700 | [diff] [blame] | 859 | if (value == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | fd->f_op = &ep_io_operations; |
Milan Svoboda | 8a7471a | 2006-06-26 07:19:00 -0700 | [diff] [blame] | 861 | value = length; |
| 862 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | gone: |
| 864 | spin_unlock_irq (&data->dev->lock); |
| 865 | if (value < 0) { |
| 866 | fail: |
| 867 | data->desc.bDescriptorType = 0; |
| 868 | data->hs_desc.bDescriptorType = 0; |
| 869 | } |
| 870 | up (&data->lock); |
| 871 | return value; |
| 872 | fail0: |
| 873 | value = -EINVAL; |
| 874 | goto fail; |
| 875 | fail1: |
| 876 | value = -EFAULT; |
| 877 | goto fail; |
| 878 | } |
| 879 | |
| 880 | static int |
| 881 | ep_open (struct inode *inode, struct file *fd) |
| 882 | { |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 883 | struct ep_data *data = inode->i_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | int value = -EBUSY; |
| 885 | |
| 886 | if (down_interruptible (&data->lock) != 0) |
| 887 | return -EINTR; |
| 888 | spin_lock_irq (&data->dev->lock); |
| 889 | if (data->dev->state == STATE_DEV_UNBOUND) |
| 890 | value = -ENOENT; |
| 891 | else if (data->state == STATE_EP_DISABLED) { |
| 892 | value = 0; |
| 893 | data->state = STATE_EP_READY; |
| 894 | get_ep (data); |
| 895 | fd->private_data = data; |
| 896 | VDEBUG (data->dev, "%s ready\n", data->name); |
| 897 | } else |
| 898 | DBG (data->dev, "%s state %d\n", |
| 899 | data->name, data->state); |
| 900 | spin_unlock_irq (&data->dev->lock); |
| 901 | up (&data->lock); |
| 902 | return value; |
| 903 | } |
| 904 | |
| 905 | /* used before endpoint configuration */ |
Luiz Fernando N. Capitulino | 066202d | 2006-08-05 20:37:11 -0300 | [diff] [blame] | 906 | static const struct file_operations ep_config_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | .owner = THIS_MODULE, |
| 908 | .llseek = no_llseek, |
| 909 | |
| 910 | .open = ep_open, |
| 911 | .write = ep_config, |
| 912 | .release = ep_release, |
| 913 | }; |
| 914 | |
| 915 | /*----------------------------------------------------------------------*/ |
| 916 | |
| 917 | /* EP0 IMPLEMENTATION can be partly in userspace. |
| 918 | * |
| 919 | * Drivers that use this facility receive various events, including |
| 920 | * control requests the kernel doesn't handle. Drivers that don't |
| 921 | * use this facility may be too simple-minded for real applications. |
| 922 | */ |
| 923 | |
| 924 | static inline void ep0_readable (struct dev_data *dev) |
| 925 | { |
| 926 | wake_up (&dev->wait); |
| 927 | kill_fasync (&dev->fasync, SIGIO, POLL_IN); |
| 928 | } |
| 929 | |
| 930 | static void clean_req (struct usb_ep *ep, struct usb_request *req) |
| 931 | { |
| 932 | struct dev_data *dev = ep->driver_data; |
| 933 | |
| 934 | if (req->buf != dev->rbuf) { |
| 935 | usb_ep_free_buffer (ep, req->buf, req->dma, req->length); |
| 936 | req->buf = dev->rbuf; |
| 937 | req->dma = DMA_ADDR_INVALID; |
| 938 | } |
| 939 | req->complete = epio_complete; |
| 940 | dev->setup_out_ready = 0; |
| 941 | } |
| 942 | |
| 943 | static void ep0_complete (struct usb_ep *ep, struct usb_request *req) |
| 944 | { |
| 945 | struct dev_data *dev = ep->driver_data; |
| 946 | int free = 1; |
| 947 | |
| 948 | /* for control OUT, data must still get to userspace */ |
| 949 | if (!dev->setup_in) { |
| 950 | dev->setup_out_error = (req->status != 0); |
| 951 | if (!dev->setup_out_error) |
| 952 | free = 0; |
| 953 | dev->setup_out_ready = 1; |
| 954 | ep0_readable (dev); |
| 955 | } else if (dev->state == STATE_SETUP) |
| 956 | dev->state = STATE_CONNECTED; |
| 957 | |
| 958 | /* clean up as appropriate */ |
| 959 | if (free && req->buf != &dev->rbuf) |
| 960 | clean_req (ep, req); |
| 961 | req->complete = epio_complete; |
| 962 | } |
| 963 | |
| 964 | static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len) |
| 965 | { |
| 966 | struct dev_data *dev = ep->driver_data; |
| 967 | |
| 968 | if (dev->setup_out_ready) { |
| 969 | DBG (dev, "ep0 request busy!\n"); |
| 970 | return -EBUSY; |
| 971 | } |
| 972 | if (len > sizeof (dev->rbuf)) |
| 973 | req->buf = usb_ep_alloc_buffer (ep, len, &req->dma, GFP_ATOMIC); |
| 974 | if (req->buf == 0) { |
| 975 | req->buf = dev->rbuf; |
| 976 | return -ENOMEM; |
| 977 | } |
| 978 | req->complete = ep0_complete; |
| 979 | req->length = len; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 980 | req->zero = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | return 0; |
| 982 | } |
| 983 | |
| 984 | static ssize_t |
| 985 | ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr) |
| 986 | { |
| 987 | struct dev_data *dev = fd->private_data; |
| 988 | ssize_t retval; |
| 989 | enum ep0_state state; |
| 990 | |
| 991 | spin_lock_irq (&dev->lock); |
| 992 | |
| 993 | /* report fd mode change before acting on it */ |
| 994 | if (dev->setup_abort) { |
| 995 | dev->setup_abort = 0; |
| 996 | retval = -EIDRM; |
| 997 | goto done; |
| 998 | } |
| 999 | |
| 1000 | /* control DATA stage */ |
| 1001 | if ((state = dev->state) == STATE_SETUP) { |
| 1002 | |
| 1003 | if (dev->setup_in) { /* stall IN */ |
| 1004 | VDEBUG(dev, "ep0in stall\n"); |
| 1005 | (void) usb_ep_set_halt (dev->gadget->ep0); |
| 1006 | retval = -EL2HLT; |
| 1007 | dev->state = STATE_CONNECTED; |
| 1008 | |
| 1009 | } else if (len == 0) { /* ack SET_CONFIGURATION etc */ |
| 1010 | struct usb_ep *ep = dev->gadget->ep0; |
| 1011 | struct usb_request *req = dev->req; |
| 1012 | |
| 1013 | if ((retval = setup_req (ep, req, 0)) == 0) |
| 1014 | retval = usb_ep_queue (ep, req, GFP_ATOMIC); |
| 1015 | dev->state = STATE_CONNECTED; |
| 1016 | |
| 1017 | /* assume that was SET_CONFIGURATION */ |
| 1018 | if (dev->current_config) { |
| 1019 | unsigned power; |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1020 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | if (dev->gadget->speed == USB_SPEED_HIGH) |
| 1022 | power = dev->hs_config->bMaxPower; |
| 1023 | else |
| 1024 | #endif |
| 1025 | power = dev->config->bMaxPower; |
| 1026 | usb_gadget_vbus_draw(dev->gadget, 2 * power); |
| 1027 | } |
| 1028 | |
| 1029 | } else { /* collect OUT data */ |
| 1030 | if ((fd->f_flags & O_NONBLOCK) != 0 |
| 1031 | && !dev->setup_out_ready) { |
| 1032 | retval = -EAGAIN; |
| 1033 | goto done; |
| 1034 | } |
| 1035 | spin_unlock_irq (&dev->lock); |
| 1036 | retval = wait_event_interruptible (dev->wait, |
| 1037 | dev->setup_out_ready != 0); |
| 1038 | |
| 1039 | /* FIXME state could change from under us */ |
| 1040 | spin_lock_irq (&dev->lock); |
| 1041 | if (retval) |
| 1042 | goto done; |
| 1043 | if (dev->setup_out_error) |
| 1044 | retval = -EIO; |
| 1045 | else { |
| 1046 | len = min (len, (size_t)dev->req->actual); |
| 1047 | // FIXME don't call this with the spinlock held ... |
Skip Hansen | 997694d | 2006-09-01 15:26:27 -0700 | [diff] [blame] | 1048 | if (copy_to_user (buf, dev->req->buf, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | retval = -EFAULT; |
| 1050 | clean_req (dev->gadget->ep0, dev->req); |
| 1051 | /* NOTE userspace can't yet choose to stall */ |
| 1052 | } |
| 1053 | } |
| 1054 | goto done; |
| 1055 | } |
| 1056 | |
| 1057 | /* else normal: return event data */ |
| 1058 | if (len < sizeof dev->event [0]) { |
| 1059 | retval = -EINVAL; |
| 1060 | goto done; |
| 1061 | } |
| 1062 | len -= len % sizeof (struct usb_gadgetfs_event); |
| 1063 | dev->usermode_setup = 1; |
| 1064 | |
| 1065 | scan: |
| 1066 | /* return queued events right away */ |
| 1067 | if (dev->ev_next != 0) { |
| 1068 | unsigned i, n; |
| 1069 | int tmp = dev->ev_next; |
| 1070 | |
| 1071 | len = min (len, tmp * sizeof (struct usb_gadgetfs_event)); |
| 1072 | n = len / sizeof (struct usb_gadgetfs_event); |
| 1073 | |
| 1074 | /* ep0 can't deliver events when STATE_SETUP */ |
| 1075 | for (i = 0; i < n; i++) { |
| 1076 | if (dev->event [i].type == GADGETFS_SETUP) { |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1077 | len = i + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | len *= sizeof (struct usb_gadgetfs_event); |
| 1079 | n = 0; |
| 1080 | break; |
| 1081 | } |
| 1082 | } |
| 1083 | spin_unlock_irq (&dev->lock); |
| 1084 | if (copy_to_user (buf, &dev->event, len)) |
| 1085 | retval = -EFAULT; |
| 1086 | else |
| 1087 | retval = len; |
| 1088 | if (len > 0) { |
| 1089 | len /= sizeof (struct usb_gadgetfs_event); |
| 1090 | |
| 1091 | /* NOTE this doesn't guard against broken drivers; |
| 1092 | * concurrent ep0 readers may lose events. |
| 1093 | */ |
| 1094 | spin_lock_irq (&dev->lock); |
| 1095 | dev->ev_next -= len; |
| 1096 | if (dev->ev_next != 0) |
| 1097 | memmove (&dev->event, &dev->event [len], |
| 1098 | sizeof (struct usb_gadgetfs_event) |
| 1099 | * (tmp - len)); |
| 1100 | if (n == 0) |
| 1101 | dev->state = STATE_SETUP; |
| 1102 | spin_unlock_irq (&dev->lock); |
| 1103 | } |
| 1104 | return retval; |
| 1105 | } |
| 1106 | if (fd->f_flags & O_NONBLOCK) { |
| 1107 | retval = -EAGAIN; |
| 1108 | goto done; |
| 1109 | } |
| 1110 | |
| 1111 | switch (state) { |
| 1112 | default: |
| 1113 | DBG (dev, "fail %s, state %d\n", __FUNCTION__, state); |
| 1114 | retval = -ESRCH; |
| 1115 | break; |
| 1116 | case STATE_UNCONNECTED: |
| 1117 | case STATE_CONNECTED: |
| 1118 | spin_unlock_irq (&dev->lock); |
| 1119 | DBG (dev, "%s wait\n", __FUNCTION__); |
| 1120 | |
| 1121 | /* wait for events */ |
| 1122 | retval = wait_event_interruptible (dev->wait, |
| 1123 | dev->ev_next != 0); |
| 1124 | if (retval < 0) |
| 1125 | return retval; |
| 1126 | spin_lock_irq (&dev->lock); |
| 1127 | goto scan; |
| 1128 | } |
| 1129 | |
| 1130 | done: |
| 1131 | spin_unlock_irq (&dev->lock); |
| 1132 | return retval; |
| 1133 | } |
| 1134 | |
| 1135 | static struct usb_gadgetfs_event * |
| 1136 | next_event (struct dev_data *dev, enum usb_gadgetfs_event_type type) |
| 1137 | { |
| 1138 | struct usb_gadgetfs_event *event; |
| 1139 | unsigned i; |
| 1140 | |
| 1141 | switch (type) { |
| 1142 | /* these events purge the queue */ |
| 1143 | case GADGETFS_DISCONNECT: |
| 1144 | if (dev->state == STATE_SETUP) |
| 1145 | dev->setup_abort = 1; |
| 1146 | // FALL THROUGH |
| 1147 | case GADGETFS_CONNECT: |
| 1148 | dev->ev_next = 0; |
| 1149 | break; |
| 1150 | case GADGETFS_SETUP: /* previous request timed out */ |
| 1151 | case GADGETFS_SUSPEND: /* same effect */ |
| 1152 | /* these events can't be repeated */ |
| 1153 | for (i = 0; i != dev->ev_next; i++) { |
| 1154 | if (dev->event [i].type != type) |
| 1155 | continue; |
| 1156 | DBG (dev, "discard old event %d\n", type); |
| 1157 | dev->ev_next--; |
| 1158 | if (i == dev->ev_next) |
| 1159 | break; |
| 1160 | /* indices start at zero, for simplicity */ |
| 1161 | memmove (&dev->event [i], &dev->event [i + 1], |
| 1162 | sizeof (struct usb_gadgetfs_event) |
| 1163 | * (dev->ev_next - i)); |
| 1164 | } |
| 1165 | break; |
| 1166 | default: |
| 1167 | BUG (); |
| 1168 | } |
| 1169 | event = &dev->event [dev->ev_next++]; |
| 1170 | BUG_ON (dev->ev_next > N_EVENT); |
| 1171 | VDEBUG (dev, "ev %d, next %d\n", type, dev->ev_next); |
| 1172 | memset (event, 0, sizeof *event); |
| 1173 | event->type = type; |
| 1174 | return event; |
| 1175 | } |
| 1176 | |
| 1177 | static ssize_t |
| 1178 | ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 1179 | { |
| 1180 | struct dev_data *dev = fd->private_data; |
| 1181 | ssize_t retval = -ESRCH; |
| 1182 | |
| 1183 | spin_lock_irq (&dev->lock); |
| 1184 | |
| 1185 | /* report fd mode change before acting on it */ |
| 1186 | if (dev->setup_abort) { |
| 1187 | dev->setup_abort = 0; |
| 1188 | retval = -EIDRM; |
| 1189 | |
| 1190 | /* data and/or status stage for control request */ |
| 1191 | } else if (dev->state == STATE_SETUP) { |
| 1192 | |
| 1193 | /* IN DATA+STATUS caller makes len <= wLength */ |
| 1194 | if (dev->setup_in) { |
| 1195 | retval = setup_req (dev->gadget->ep0, dev->req, len); |
| 1196 | if (retval == 0) { |
| 1197 | spin_unlock_irq (&dev->lock); |
| 1198 | if (copy_from_user (dev->req->buf, buf, len)) |
| 1199 | retval = -EFAULT; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 1200 | else { |
| 1201 | if (len < dev->setup_wLength) |
| 1202 | dev->req->zero = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | retval = usb_ep_queue ( |
| 1204 | dev->gadget->ep0, dev->req, |
| 1205 | GFP_KERNEL); |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 1206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | if (retval < 0) { |
| 1208 | spin_lock_irq (&dev->lock); |
| 1209 | clean_req (dev->gadget->ep0, dev->req); |
| 1210 | spin_unlock_irq (&dev->lock); |
| 1211 | } else |
| 1212 | retval = len; |
| 1213 | |
| 1214 | return retval; |
| 1215 | } |
| 1216 | |
| 1217 | /* can stall some OUT transfers */ |
| 1218 | } else if (dev->setup_can_stall) { |
| 1219 | VDEBUG(dev, "ep0out stall\n"); |
| 1220 | (void) usb_ep_set_halt (dev->gadget->ep0); |
| 1221 | retval = -EL2HLT; |
| 1222 | dev->state = STATE_CONNECTED; |
| 1223 | } else { |
| 1224 | DBG(dev, "bogus ep0out stall!\n"); |
| 1225 | } |
| 1226 | } else |
| 1227 | DBG (dev, "fail %s, state %d\n", __FUNCTION__, dev->state); |
| 1228 | |
| 1229 | spin_unlock_irq (&dev->lock); |
| 1230 | return retval; |
| 1231 | } |
| 1232 | |
| 1233 | static int |
| 1234 | ep0_fasync (int f, struct file *fd, int on) |
| 1235 | { |
| 1236 | struct dev_data *dev = fd->private_data; |
| 1237 | // caller must F_SETOWN before signal delivery happens |
| 1238 | VDEBUG (dev, "%s %s\n", __FUNCTION__, on ? "on" : "off"); |
| 1239 | return fasync_helper (f, fd, on, &dev->fasync); |
| 1240 | } |
| 1241 | |
| 1242 | static struct usb_gadget_driver gadgetfs_driver; |
| 1243 | |
| 1244 | static int |
| 1245 | dev_release (struct inode *inode, struct file *fd) |
| 1246 | { |
| 1247 | struct dev_data *dev = fd->private_data; |
| 1248 | |
| 1249 | /* closing ep0 === shutdown all */ |
| 1250 | |
| 1251 | usb_gadget_unregister_driver (&gadgetfs_driver); |
| 1252 | |
| 1253 | /* at this point "good" hardware has disconnected the |
| 1254 | * device from USB; the host won't see it any more. |
| 1255 | * alternatively, all host requests will time out. |
| 1256 | */ |
| 1257 | |
| 1258 | fasync_helper (-1, fd, 0, &dev->fasync); |
| 1259 | kfree (dev->buf); |
| 1260 | dev->buf = NULL; |
| 1261 | put_dev (dev); |
| 1262 | |
| 1263 | /* other endpoints were all decoupled from this device */ |
| 1264 | dev->state = STATE_DEV_DISABLED; |
| 1265 | return 0; |
| 1266 | } |
| 1267 | |
Milan Svoboda | e22fc27 | 2006-08-08 22:23:12 -0700 | [diff] [blame] | 1268 | static unsigned int |
| 1269 | ep0_poll (struct file *fd, poll_table *wait) |
| 1270 | { |
| 1271 | struct dev_data *dev = fd->private_data; |
| 1272 | int mask = 0; |
| 1273 | |
| 1274 | poll_wait(fd, &dev->wait, wait); |
| 1275 | |
| 1276 | spin_lock_irq (&dev->lock); |
| 1277 | |
| 1278 | /* report fd mode change before acting on it */ |
| 1279 | if (dev->setup_abort) { |
| 1280 | dev->setup_abort = 0; |
| 1281 | mask = POLLHUP; |
| 1282 | goto out; |
| 1283 | } |
| 1284 | |
| 1285 | if (dev->state == STATE_SETUP) { |
| 1286 | if (dev->setup_in || dev->setup_can_stall) |
| 1287 | mask = POLLOUT; |
| 1288 | } else { |
| 1289 | if (dev->ev_next != 0) |
| 1290 | mask = POLLIN; |
| 1291 | } |
| 1292 | out: |
| 1293 | spin_unlock_irq(&dev->lock); |
| 1294 | return mask; |
| 1295 | } |
| 1296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | static int dev_ioctl (struct inode *inode, struct file *fd, |
| 1298 | unsigned code, unsigned long value) |
| 1299 | { |
| 1300 | struct dev_data *dev = fd->private_data; |
| 1301 | struct usb_gadget *gadget = dev->gadget; |
| 1302 | |
| 1303 | if (gadget->ops->ioctl) |
| 1304 | return gadget->ops->ioctl (gadget, code, value); |
| 1305 | return -ENOTTY; |
| 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, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | .ioctl = dev_ioctl, |
| 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 | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1358 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | int hs; |
| 1360 | #endif |
| 1361 | |
| 1362 | /* only one configuration */ |
| 1363 | if (index > 0) |
| 1364 | return -EINVAL; |
| 1365 | |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1366 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | hs = (dev->gadget->speed == USB_SPEED_HIGH); |
| 1368 | if (type == USB_DT_OTHER_SPEED_CONFIG) |
| 1369 | hs = !hs; |
| 1370 | if (hs) { |
| 1371 | dev->req->buf = dev->hs_config; |
| 1372 | len = le16_to_cpup (&dev->hs_config->wTotalLength); |
| 1373 | } else |
| 1374 | #endif |
| 1375 | { |
| 1376 | dev->req->buf = dev->config; |
| 1377 | len = le16_to_cpup (&dev->config->wTotalLength); |
| 1378 | } |
| 1379 | ((u8 *)dev->req->buf) [1] = type; |
| 1380 | return len; |
| 1381 | } |
| 1382 | |
| 1383 | static int |
| 1384 | gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) |
| 1385 | { |
| 1386 | struct dev_data *dev = get_gadget_data (gadget); |
| 1387 | struct usb_request *req = dev->req; |
| 1388 | int value = -EOPNOTSUPP; |
| 1389 | struct usb_gadgetfs_event *event; |
David Brownell | 1bbc169 | 2005-05-07 13:05:13 -0700 | [diff] [blame] | 1390 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 1391 | u16 w_length = le16_to_cpu(ctrl->wLength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | |
| 1393 | spin_lock (&dev->lock); |
| 1394 | dev->setup_abort = 0; |
| 1395 | if (dev->state == STATE_UNCONNECTED) { |
| 1396 | struct usb_ep *ep; |
| 1397 | struct ep_data *data; |
| 1398 | |
| 1399 | dev->state = STATE_CONNECTED; |
| 1400 | dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket; |
| 1401 | |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1402 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | if (gadget->speed == USB_SPEED_HIGH && dev->hs_config == 0) { |
| 1404 | ERROR (dev, "no high speed config??\n"); |
| 1405 | return -EINVAL; |
| 1406 | } |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1407 | #endif /* CONFIG_USB_GADGET_DUALSPEED */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | |
| 1409 | INFO (dev, "connected\n"); |
| 1410 | event = next_event (dev, GADGETFS_CONNECT); |
| 1411 | event->u.speed = gadget->speed; |
| 1412 | ep0_readable (dev); |
| 1413 | |
| 1414 | list_for_each_entry (ep, &gadget->ep_list, ep_list) { |
| 1415 | data = ep->driver_data; |
| 1416 | /* ... down_trylock (&data->lock) ... */ |
| 1417 | if (data->state != STATE_EP_DEFER_ENABLE) |
| 1418 | continue; |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1419 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | if (gadget->speed == USB_SPEED_HIGH) |
| 1421 | value = usb_ep_enable (ep, &data->hs_desc); |
| 1422 | else |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1423 | #endif /* CONFIG_USB_GADGET_DUALSPEED */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | value = usb_ep_enable (ep, &data->desc); |
| 1425 | if (value) { |
| 1426 | ERROR (dev, "deferred %s enable --> %d\n", |
| 1427 | data->name, value); |
| 1428 | continue; |
| 1429 | } |
| 1430 | data->state = STATE_EP_ENABLED; |
| 1431 | wake_up (&data->wait); |
| 1432 | DBG (dev, "woke up %s waiters\n", data->name); |
| 1433 | } |
| 1434 | |
| 1435 | /* host may have given up waiting for response. we can miss control |
| 1436 | * requests handled lower down (device/endpoint status and features); |
| 1437 | * then ep0_{read,write} will report the wrong status. controller |
| 1438 | * driver will have aborted pending i/o. |
| 1439 | */ |
| 1440 | } else if (dev->state == STATE_SETUP) |
| 1441 | dev->setup_abort = 1; |
| 1442 | |
| 1443 | req->buf = dev->rbuf; |
| 1444 | req->dma = DMA_ADDR_INVALID; |
| 1445 | req->context = NULL; |
| 1446 | value = -EOPNOTSUPP; |
| 1447 | switch (ctrl->bRequest) { |
| 1448 | |
| 1449 | case USB_REQ_GET_DESCRIPTOR: |
| 1450 | if (ctrl->bRequestType != USB_DIR_IN) |
| 1451 | goto unrecognized; |
| 1452 | switch (w_value >> 8) { |
| 1453 | |
| 1454 | case USB_DT_DEVICE: |
| 1455 | value = min (w_length, (u16) sizeof *dev->dev); |
| 1456 | req->buf = dev->dev; |
| 1457 | break; |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1458 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | case USB_DT_DEVICE_QUALIFIER: |
| 1460 | if (!dev->hs_config) |
| 1461 | break; |
| 1462 | value = min (w_length, (u16) |
| 1463 | sizeof (struct usb_qualifier_descriptor)); |
| 1464 | make_qualifier (dev); |
| 1465 | break; |
| 1466 | case USB_DT_OTHER_SPEED_CONFIG: |
| 1467 | // FALLTHROUGH |
| 1468 | #endif |
| 1469 | case USB_DT_CONFIG: |
| 1470 | value = config_buf (dev, |
| 1471 | w_value >> 8, |
| 1472 | w_value & 0xff); |
| 1473 | if (value >= 0) |
| 1474 | value = min (w_length, (u16) value); |
| 1475 | break; |
| 1476 | case USB_DT_STRING: |
| 1477 | goto unrecognized; |
| 1478 | |
| 1479 | default: // all others are errors |
| 1480 | break; |
| 1481 | } |
| 1482 | break; |
| 1483 | |
| 1484 | /* currently one config, two speeds */ |
| 1485 | case USB_REQ_SET_CONFIGURATION: |
| 1486 | if (ctrl->bRequestType != 0) |
| 1487 | break; |
| 1488 | if (0 == (u8) w_value) { |
| 1489 | value = 0; |
| 1490 | dev->current_config = 0; |
| 1491 | usb_gadget_vbus_draw(gadget, 8 /* mA */ ); |
| 1492 | // user mode expected to disable endpoints |
| 1493 | } else { |
| 1494 | u8 config, power; |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1495 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | if (gadget->speed == USB_SPEED_HIGH) { |
| 1497 | config = dev->hs_config->bConfigurationValue; |
| 1498 | power = dev->hs_config->bMaxPower; |
| 1499 | } else |
| 1500 | #endif |
| 1501 | { |
| 1502 | config = dev->config->bConfigurationValue; |
| 1503 | power = dev->config->bMaxPower; |
| 1504 | } |
| 1505 | |
| 1506 | if (config == (u8) w_value) { |
| 1507 | value = 0; |
| 1508 | dev->current_config = config; |
| 1509 | usb_gadget_vbus_draw(gadget, 2 * power); |
| 1510 | } |
| 1511 | } |
| 1512 | |
| 1513 | /* report SET_CONFIGURATION like any other control request, |
| 1514 | * except that usermode may not stall this. the next |
| 1515 | * request mustn't be allowed start until this finishes: |
| 1516 | * endpoints and threads set up, etc. |
| 1517 | * |
| 1518 | * NOTE: older PXA hardware (before PXA 255: without UDCCFR) |
| 1519 | * has bad/racey automagic that prevents synchronizing here. |
| 1520 | * even kernel mode drivers often miss them. |
| 1521 | */ |
| 1522 | if (value == 0) { |
| 1523 | INFO (dev, "configuration #%d\n", dev->current_config); |
| 1524 | if (dev->usermode_setup) { |
| 1525 | dev->setup_can_stall = 0; |
| 1526 | goto delegate; |
| 1527 | } |
| 1528 | } |
| 1529 | break; |
| 1530 | |
| 1531 | #ifndef CONFIG_USB_GADGETFS_PXA2XX |
| 1532 | /* PXA automagically handles this request too */ |
| 1533 | case USB_REQ_GET_CONFIGURATION: |
| 1534 | if (ctrl->bRequestType != 0x80) |
| 1535 | break; |
| 1536 | *(u8 *)req->buf = dev->current_config; |
| 1537 | value = min (w_length, (u16) 1); |
| 1538 | break; |
| 1539 | #endif |
| 1540 | |
| 1541 | default: |
| 1542 | unrecognized: |
| 1543 | VDEBUG (dev, "%s req%02x.%02x v%04x i%04x l%d\n", |
| 1544 | dev->usermode_setup ? "delegate" : "fail", |
| 1545 | ctrl->bRequestType, ctrl->bRequest, |
| 1546 | w_value, le16_to_cpu(ctrl->wIndex), w_length); |
| 1547 | |
| 1548 | /* if there's an ep0 reader, don't stall */ |
| 1549 | if (dev->usermode_setup) { |
| 1550 | dev->setup_can_stall = 1; |
| 1551 | delegate: |
| 1552 | dev->setup_in = (ctrl->bRequestType & USB_DIR_IN) |
| 1553 | ? 1 : 0; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 1554 | dev->setup_wLength = w_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | dev->setup_out_ready = 0; |
| 1556 | dev->setup_out_error = 0; |
| 1557 | value = 0; |
| 1558 | |
| 1559 | /* read DATA stage for OUT right away */ |
| 1560 | if (unlikely (!dev->setup_in && w_length)) { |
| 1561 | value = setup_req (gadget->ep0, dev->req, |
| 1562 | w_length); |
| 1563 | if (value < 0) |
| 1564 | break; |
| 1565 | value = usb_ep_queue (gadget->ep0, dev->req, |
| 1566 | GFP_ATOMIC); |
| 1567 | if (value < 0) { |
| 1568 | clean_req (gadget->ep0, dev->req); |
| 1569 | break; |
| 1570 | } |
| 1571 | |
| 1572 | /* we can't currently stall these */ |
| 1573 | dev->setup_can_stall = 0; |
| 1574 | } |
| 1575 | |
| 1576 | /* state changes when reader collects event */ |
| 1577 | event = next_event (dev, GADGETFS_SETUP); |
| 1578 | event->u.setup = *ctrl; |
| 1579 | ep0_readable (dev); |
| 1580 | spin_unlock (&dev->lock); |
| 1581 | return 0; |
| 1582 | } |
| 1583 | } |
| 1584 | |
| 1585 | /* proceed with data transfer and status phases? */ |
| 1586 | if (value >= 0 && dev->state != STATE_SETUP) { |
| 1587 | req->length = value; |
| 1588 | req->zero = value < w_length; |
| 1589 | value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC); |
| 1590 | if (value < 0) { |
| 1591 | DBG (dev, "ep_queue --> %d\n", value); |
| 1592 | req->status = 0; |
| 1593 | } |
| 1594 | } |
| 1595 | |
| 1596 | /* device stalls when value < 0 */ |
| 1597 | spin_unlock (&dev->lock); |
| 1598 | return value; |
| 1599 | } |
| 1600 | |
| 1601 | static void destroy_ep_files (struct dev_data *dev) |
| 1602 | { |
| 1603 | struct list_head *entry, *tmp; |
| 1604 | |
| 1605 | DBG (dev, "%s %d\n", __FUNCTION__, dev->state); |
| 1606 | |
| 1607 | /* dev->state must prevent interference */ |
| 1608 | restart: |
| 1609 | spin_lock_irq (&dev->lock); |
| 1610 | list_for_each_safe (entry, tmp, &dev->epfiles) { |
| 1611 | struct ep_data *ep; |
| 1612 | struct inode *parent; |
| 1613 | struct dentry *dentry; |
| 1614 | |
| 1615 | /* break link to FS */ |
| 1616 | ep = list_entry (entry, struct ep_data, epfiles); |
| 1617 | list_del_init (&ep->epfiles); |
| 1618 | dentry = ep->dentry; |
| 1619 | ep->dentry = NULL; |
| 1620 | parent = dentry->d_parent->d_inode; |
| 1621 | |
| 1622 | /* break link to controller */ |
| 1623 | if (ep->state == STATE_EP_ENABLED) |
| 1624 | (void) usb_ep_disable (ep->ep); |
| 1625 | ep->state = STATE_EP_UNBOUND; |
| 1626 | usb_ep_free_request (ep->ep, ep->req); |
| 1627 | ep->ep = NULL; |
| 1628 | wake_up (&ep->wait); |
| 1629 | put_ep (ep); |
| 1630 | |
| 1631 | spin_unlock_irq (&dev->lock); |
| 1632 | |
| 1633 | /* break link to dcache */ |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1634 | mutex_lock (&parent->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | d_delete (dentry); |
| 1636 | dput (dentry); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1637 | mutex_unlock (&parent->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | |
| 1639 | /* fds may still be open */ |
| 1640 | goto restart; |
| 1641 | } |
| 1642 | spin_unlock_irq (&dev->lock); |
| 1643 | } |
| 1644 | |
| 1645 | |
| 1646 | static struct inode * |
| 1647 | gadgetfs_create_file (struct super_block *sb, char const *name, |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 1648 | void *data, const struct file_operations *fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | struct dentry **dentry_p); |
| 1650 | |
| 1651 | static int activate_ep_files (struct dev_data *dev) |
| 1652 | { |
| 1653 | struct usb_ep *ep; |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1654 | struct ep_data *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | |
| 1656 | gadget_for_each_ep (ep, dev->gadget) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | |
Eric Sesterhenn | 7039f42 | 2006-02-27 13:34:10 -0800 | [diff] [blame] | 1658 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | if (!data) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1660 | goto enomem0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | data->state = STATE_EP_DISABLED; |
| 1662 | init_MUTEX (&data->lock); |
| 1663 | init_waitqueue_head (&data->wait); |
| 1664 | |
| 1665 | strncpy (data->name, ep->name, sizeof (data->name) - 1); |
| 1666 | atomic_set (&data->count, 1); |
| 1667 | data->dev = dev; |
| 1668 | get_dev (dev); |
| 1669 | |
| 1670 | data->ep = ep; |
| 1671 | ep->driver_data = data; |
| 1672 | |
| 1673 | data->req = usb_ep_alloc_request (ep, GFP_KERNEL); |
| 1674 | if (!data->req) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1675 | goto enomem1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | |
| 1677 | data->inode = gadgetfs_create_file (dev->sb, data->name, |
| 1678 | data, &ep_config_operations, |
| 1679 | &data->dentry); |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1680 | if (!data->inode) |
| 1681 | goto enomem2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | list_add_tail (&data->epfiles, &dev->epfiles); |
| 1683 | } |
| 1684 | return 0; |
| 1685 | |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1686 | enomem2: |
| 1687 | usb_ep_free_request (ep, data->req); |
| 1688 | enomem1: |
| 1689 | put_dev (dev); |
| 1690 | kfree (data); |
| 1691 | enomem0: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | DBG (dev, "%s enomem\n", __FUNCTION__); |
| 1693 | destroy_ep_files (dev); |
| 1694 | return -ENOMEM; |
| 1695 | } |
| 1696 | |
| 1697 | static void |
| 1698 | gadgetfs_unbind (struct usb_gadget *gadget) |
| 1699 | { |
| 1700 | struct dev_data *dev = get_gadget_data (gadget); |
| 1701 | |
| 1702 | DBG (dev, "%s\n", __FUNCTION__); |
| 1703 | |
| 1704 | spin_lock_irq (&dev->lock); |
| 1705 | dev->state = STATE_DEV_UNBOUND; |
| 1706 | spin_unlock_irq (&dev->lock); |
| 1707 | |
| 1708 | destroy_ep_files (dev); |
| 1709 | gadget->ep0->driver_data = NULL; |
| 1710 | set_gadget_data (gadget, NULL); |
| 1711 | |
| 1712 | /* we've already been disconnected ... no i/o is active */ |
| 1713 | if (dev->req) |
| 1714 | usb_ep_free_request (gadget->ep0, dev->req); |
| 1715 | DBG (dev, "%s done\n", __FUNCTION__); |
| 1716 | put_dev (dev); |
| 1717 | } |
| 1718 | |
| 1719 | static struct dev_data *the_device; |
| 1720 | |
| 1721 | static int |
| 1722 | gadgetfs_bind (struct usb_gadget *gadget) |
| 1723 | { |
| 1724 | struct dev_data *dev = the_device; |
| 1725 | |
| 1726 | if (!dev) |
| 1727 | return -ESRCH; |
| 1728 | if (0 != strcmp (CHIP, gadget->name)) { |
| 1729 | printk (KERN_ERR "%s expected %s controller not %s\n", |
| 1730 | shortname, CHIP, gadget->name); |
| 1731 | return -ENODEV; |
| 1732 | } |
| 1733 | |
| 1734 | set_gadget_data (gadget, dev); |
| 1735 | dev->gadget = gadget; |
| 1736 | gadget->ep0->driver_data = dev; |
| 1737 | dev->dev->bMaxPacketSize0 = gadget->ep0->maxpacket; |
| 1738 | |
| 1739 | /* preallocate control response and buffer */ |
| 1740 | dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL); |
| 1741 | if (!dev->req) |
| 1742 | goto enomem; |
| 1743 | dev->req->context = NULL; |
| 1744 | dev->req->complete = epio_complete; |
| 1745 | |
| 1746 | if (activate_ep_files (dev) < 0) |
| 1747 | goto enomem; |
| 1748 | |
| 1749 | INFO (dev, "bound to %s driver\n", gadget->name); |
| 1750 | dev->state = STATE_UNCONNECTED; |
| 1751 | get_dev (dev); |
| 1752 | return 0; |
| 1753 | |
| 1754 | enomem: |
| 1755 | gadgetfs_unbind (gadget); |
| 1756 | return -ENOMEM; |
| 1757 | } |
| 1758 | |
| 1759 | static void |
| 1760 | gadgetfs_disconnect (struct usb_gadget *gadget) |
| 1761 | { |
| 1762 | struct dev_data *dev = get_gadget_data (gadget); |
| 1763 | |
Milan Svoboda | 07cb7f2 | 2006-06-26 07:46:00 -0700 | [diff] [blame] | 1764 | spin_lock (&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | if (dev->state == STATE_UNCONNECTED) { |
| 1766 | DBG (dev, "already unconnected\n"); |
Milan Svoboda | 07cb7f2 | 2006-06-26 07:46:00 -0700 | [diff] [blame] | 1767 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | } |
| 1769 | dev->state = STATE_UNCONNECTED; |
| 1770 | |
| 1771 | INFO (dev, "disconnected\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | next_event (dev, GADGETFS_DISCONNECT); |
| 1773 | ep0_readable (dev); |
Milan Svoboda | 07cb7f2 | 2006-06-26 07:46:00 -0700 | [diff] [blame] | 1774 | exit: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | spin_unlock (&dev->lock); |
| 1776 | } |
| 1777 | |
| 1778 | static void |
| 1779 | gadgetfs_suspend (struct usb_gadget *gadget) |
| 1780 | { |
| 1781 | struct dev_data *dev = get_gadget_data (gadget); |
| 1782 | |
| 1783 | INFO (dev, "suspended from state %d\n", dev->state); |
| 1784 | spin_lock (&dev->lock); |
| 1785 | switch (dev->state) { |
| 1786 | case STATE_SETUP: // VERY odd... host died?? |
| 1787 | case STATE_CONNECTED: |
| 1788 | case STATE_UNCONNECTED: |
| 1789 | next_event (dev, GADGETFS_SUSPEND); |
| 1790 | ep0_readable (dev); |
| 1791 | /* FALLTHROUGH */ |
| 1792 | default: |
| 1793 | break; |
| 1794 | } |
| 1795 | spin_unlock (&dev->lock); |
| 1796 | } |
| 1797 | |
| 1798 | static struct usb_gadget_driver gadgetfs_driver = { |
David Brownell | 9841633 | 2006-04-02 10:19:23 -0800 | [diff] [blame] | 1799 | #ifdef CONFIG_USB_GADGET_DUALSPEED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | .speed = USB_SPEED_HIGH, |
| 1801 | #else |
| 1802 | .speed = USB_SPEED_FULL, |
| 1803 | #endif |
| 1804 | .function = (char *) driver_desc, |
| 1805 | .bind = gadgetfs_bind, |
| 1806 | .unbind = gadgetfs_unbind, |
| 1807 | .setup = gadgetfs_setup, |
| 1808 | .disconnect = gadgetfs_disconnect, |
| 1809 | .suspend = gadgetfs_suspend, |
| 1810 | |
| 1811 | .driver = { |
| 1812 | .name = (char *) shortname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | }, |
| 1814 | }; |
| 1815 | |
| 1816 | /*----------------------------------------------------------------------*/ |
| 1817 | |
| 1818 | static void gadgetfs_nop(struct usb_gadget *arg) { } |
| 1819 | |
| 1820 | static int gadgetfs_probe (struct usb_gadget *gadget) |
| 1821 | { |
| 1822 | CHIP = gadget->name; |
| 1823 | return -EISNAM; |
| 1824 | } |
| 1825 | |
| 1826 | static struct usb_gadget_driver probe_driver = { |
| 1827 | .speed = USB_SPEED_HIGH, |
| 1828 | .bind = gadgetfs_probe, |
| 1829 | .unbind = gadgetfs_nop, |
| 1830 | .setup = (void *)gadgetfs_nop, |
| 1831 | .disconnect = gadgetfs_nop, |
| 1832 | .driver = { |
| 1833 | .name = "nop", |
| 1834 | }, |
| 1835 | }; |
| 1836 | |
| 1837 | |
| 1838 | /* DEVICE INITIALIZATION |
| 1839 | * |
| 1840 | * fd = open ("/dev/gadget/$CHIP", O_RDWR) |
| 1841 | * status = write (fd, descriptors, sizeof descriptors) |
| 1842 | * |
| 1843 | * That write establishes the device configuration, so the kernel can |
| 1844 | * bind to the controller ... guaranteeing it can handle enumeration |
| 1845 | * at all necessary speeds. Descriptor order is: |
| 1846 | * |
| 1847 | * . message tag (u32, host order) ... for now, must be zero; it |
| 1848 | * would change to support features like multi-config devices |
| 1849 | * . full/low speed config ... all wTotalLength bytes (with interface, |
| 1850 | * class, altsetting, endpoint, and other descriptors) |
| 1851 | * . high speed config ... all descriptors, for high speed operation; |
| 1852 | * this one's optional except for high-speed hardware |
| 1853 | * . device descriptor |
| 1854 | * |
| 1855 | * Endpoints are not yet enabled. Drivers may want to immediately |
| 1856 | * initialize them, using the /dev/gadget/ep* files that are available |
| 1857 | * as soon as the kernel sees the configuration, or they can wait |
| 1858 | * until device configuration and interface altsetting changes create |
| 1859 | * the need to configure (or unconfigure) them. |
| 1860 | * |
| 1861 | * After initialization, the device stays active for as long as that |
| 1862 | * $CHIP file is open. Events may then be read from that descriptor, |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1863 | * such as configuration notifications. More complex drivers will handle |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | * some control requests in user space. |
| 1865 | */ |
| 1866 | |
| 1867 | static int is_valid_config (struct usb_config_descriptor *config) |
| 1868 | { |
| 1869 | return config->bDescriptorType == USB_DT_CONFIG |
| 1870 | && config->bLength == USB_DT_CONFIG_SIZE |
| 1871 | && config->bConfigurationValue != 0 |
| 1872 | && (config->bmAttributes & USB_CONFIG_ATT_ONE) != 0 |
| 1873 | && (config->bmAttributes & USB_CONFIG_ATT_WAKEUP) == 0; |
| 1874 | /* FIXME if gadget->is_otg, _must_ include an otg descriptor */ |
| 1875 | /* FIXME check lengths: walk to end */ |
| 1876 | } |
| 1877 | |
| 1878 | static ssize_t |
| 1879 | dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 1880 | { |
| 1881 | struct dev_data *dev = fd->private_data; |
| 1882 | ssize_t value = len, length = len; |
| 1883 | unsigned total; |
| 1884 | u32 tag; |
| 1885 | char *kbuf; |
| 1886 | |
| 1887 | if (dev->state != STATE_OPENED) |
| 1888 | return -EEXIST; |
| 1889 | |
| 1890 | if (len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4)) |
| 1891 | return -EINVAL; |
| 1892 | |
| 1893 | /* we might need to change message format someday */ |
| 1894 | if (copy_from_user (&tag, buf, 4)) |
| 1895 | return -EFAULT; |
| 1896 | if (tag != 0) |
| 1897 | return -EINVAL; |
| 1898 | buf += 4; |
| 1899 | length -= 4; |
| 1900 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 1901 | kbuf = kmalloc (length, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1902 | if (!kbuf) |
| 1903 | return -ENOMEM; |
| 1904 | if (copy_from_user (kbuf, buf, length)) { |
| 1905 | kfree (kbuf); |
| 1906 | return -EFAULT; |
| 1907 | } |
| 1908 | |
| 1909 | spin_lock_irq (&dev->lock); |
| 1910 | value = -EINVAL; |
| 1911 | if (dev->buf) |
| 1912 | goto fail; |
| 1913 | dev->buf = kbuf; |
| 1914 | |
| 1915 | /* full or low speed config */ |
| 1916 | dev->config = (void *) kbuf; |
| 1917 | total = le16_to_cpup (&dev->config->wTotalLength); |
| 1918 | if (!is_valid_config (dev->config) || total >= length) |
| 1919 | goto fail; |
| 1920 | kbuf += total; |
| 1921 | length -= total; |
| 1922 | |
| 1923 | /* optional high speed config */ |
| 1924 | if (kbuf [1] == USB_DT_CONFIG) { |
| 1925 | dev->hs_config = (void *) kbuf; |
| 1926 | total = le16_to_cpup (&dev->hs_config->wTotalLength); |
| 1927 | if (!is_valid_config (dev->hs_config) || total >= length) |
| 1928 | goto fail; |
| 1929 | kbuf += total; |
| 1930 | length -= total; |
| 1931 | } |
| 1932 | |
| 1933 | /* could support multiple configs, using another encoding! */ |
| 1934 | |
| 1935 | /* device descriptor (tweaked for paranoia) */ |
| 1936 | if (length != USB_DT_DEVICE_SIZE) |
| 1937 | goto fail; |
| 1938 | dev->dev = (void *)kbuf; |
| 1939 | if (dev->dev->bLength != USB_DT_DEVICE_SIZE |
| 1940 | || dev->dev->bDescriptorType != USB_DT_DEVICE |
| 1941 | || dev->dev->bNumConfigurations != 1) |
| 1942 | goto fail; |
| 1943 | dev->dev->bNumConfigurations = 1; |
| 1944 | dev->dev->bcdUSB = __constant_cpu_to_le16 (0x0200); |
| 1945 | |
| 1946 | /* triggers gadgetfs_bind(); then we can enumerate. */ |
| 1947 | spin_unlock_irq (&dev->lock); |
| 1948 | value = usb_gadget_register_driver (&gadgetfs_driver); |
| 1949 | if (value != 0) { |
| 1950 | kfree (dev->buf); |
| 1951 | dev->buf = NULL; |
| 1952 | } else { |
| 1953 | /* at this point "good" hardware has for the first time |
| 1954 | * let the USB the host see us. alternatively, if users |
| 1955 | * unplug/replug that will clear all the error state. |
| 1956 | * |
| 1957 | * note: everything running before here was guaranteed |
| 1958 | * to choke driver model style diagnostics. from here |
| 1959 | * on, they can work ... except in cleanup paths that |
| 1960 | * kick in after the ep0 descriptor is closed. |
| 1961 | */ |
| 1962 | fd->f_op = &ep0_io_operations; |
| 1963 | value = len; |
| 1964 | } |
| 1965 | return value; |
| 1966 | |
| 1967 | fail: |
| 1968 | spin_unlock_irq (&dev->lock); |
| 1969 | pr_debug ("%s: %s fail %Zd, %p\n", shortname, __FUNCTION__, value, dev); |
| 1970 | kfree (dev->buf); |
| 1971 | dev->buf = NULL; |
| 1972 | return value; |
| 1973 | } |
| 1974 | |
| 1975 | static int |
| 1976 | dev_open (struct inode *inode, struct file *fd) |
| 1977 | { |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 1978 | struct dev_data *dev = inode->i_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | int value = -EBUSY; |
| 1980 | |
| 1981 | if (dev->state == STATE_DEV_DISABLED) { |
| 1982 | dev->ev_next = 0; |
| 1983 | dev->state = STATE_OPENED; |
| 1984 | fd->private_data = dev; |
| 1985 | get_dev (dev); |
| 1986 | value = 0; |
| 1987 | } |
| 1988 | return value; |
| 1989 | } |
| 1990 | |
Luiz Fernando N. Capitulino | 066202d | 2006-08-05 20:37:11 -0300 | [diff] [blame] | 1991 | static const struct file_operations dev_init_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1992 | .owner = THIS_MODULE, |
| 1993 | .llseek = no_llseek, |
| 1994 | |
| 1995 | .open = dev_open, |
| 1996 | .write = dev_config, |
| 1997 | .fasync = ep0_fasync, |
| 1998 | .ioctl = dev_ioctl, |
| 1999 | .release = dev_release, |
| 2000 | }; |
| 2001 | |
| 2002 | /*----------------------------------------------------------------------*/ |
| 2003 | |
| 2004 | /* FILESYSTEM AND SUPERBLOCK OPERATIONS |
| 2005 | * |
| 2006 | * Mounting the filesystem creates a controller file, used first for |
| 2007 | * device configuration then later for event monitoring. |
| 2008 | */ |
| 2009 | |
| 2010 | |
| 2011 | /* FIXME PAM etc could set this security policy without mount options |
| 2012 | * if epfiles inherited ownership and permissons from ep0 ... |
| 2013 | */ |
| 2014 | |
| 2015 | static unsigned default_uid; |
| 2016 | static unsigned default_gid; |
| 2017 | static unsigned default_perm = S_IRUSR | S_IWUSR; |
| 2018 | |
| 2019 | module_param (default_uid, uint, 0644); |
| 2020 | module_param (default_gid, uint, 0644); |
| 2021 | module_param (default_perm, uint, 0644); |
| 2022 | |
| 2023 | |
| 2024 | static struct inode * |
| 2025 | gadgetfs_make_inode (struct super_block *sb, |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 2026 | void *data, const struct file_operations *fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | int mode) |
| 2028 | { |
| 2029 | struct inode *inode = new_inode (sb); |
| 2030 | |
| 2031 | if (inode) { |
| 2032 | inode->i_mode = mode; |
| 2033 | inode->i_uid = default_uid; |
| 2034 | inode->i_gid = default_gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | inode->i_blocks = 0; |
| 2036 | inode->i_atime = inode->i_mtime = inode->i_ctime |
| 2037 | = CURRENT_TIME; |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 2038 | inode->i_private = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | inode->i_fop = fops; |
| 2040 | } |
| 2041 | return inode; |
| 2042 | } |
| 2043 | |
| 2044 | /* creates in fs root directory, so non-renamable and non-linkable. |
| 2045 | * so inode and dentry are paired, until device reconfig. |
| 2046 | */ |
| 2047 | static struct inode * |
| 2048 | gadgetfs_create_file (struct super_block *sb, char const *name, |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 2049 | void *data, const struct file_operations *fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | struct dentry **dentry_p) |
| 2051 | { |
| 2052 | struct dentry *dentry; |
| 2053 | struct inode *inode; |
| 2054 | |
| 2055 | dentry = d_alloc_name(sb->s_root, name); |
| 2056 | if (!dentry) |
| 2057 | return NULL; |
| 2058 | |
| 2059 | inode = gadgetfs_make_inode (sb, data, fops, |
| 2060 | S_IFREG | (default_perm & S_IRWXUGO)); |
| 2061 | if (!inode) { |
| 2062 | dput(dentry); |
| 2063 | return NULL; |
| 2064 | } |
| 2065 | d_add (dentry, inode); |
| 2066 | *dentry_p = dentry; |
| 2067 | return inode; |
| 2068 | } |
| 2069 | |
| 2070 | static struct super_operations gadget_fs_operations = { |
| 2071 | .statfs = simple_statfs, |
| 2072 | .drop_inode = generic_delete_inode, |
| 2073 | }; |
| 2074 | |
| 2075 | static int |
| 2076 | gadgetfs_fill_super (struct super_block *sb, void *opts, int silent) |
| 2077 | { |
| 2078 | struct inode *inode; |
| 2079 | struct dentry *d; |
| 2080 | struct dev_data *dev; |
| 2081 | |
| 2082 | if (the_device) |
| 2083 | return -ESRCH; |
| 2084 | |
| 2085 | /* fake probe to determine $CHIP */ |
| 2086 | (void) usb_gadget_register_driver (&probe_driver); |
| 2087 | if (!CHIP) |
| 2088 | return -ENODEV; |
| 2089 | |
| 2090 | /* superblock */ |
| 2091 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 2092 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 2093 | sb->s_magic = GADGETFS_MAGIC; |
| 2094 | sb->s_op = &gadget_fs_operations; |
| 2095 | sb->s_time_gran = 1; |
| 2096 | |
| 2097 | /* root inode */ |
| 2098 | inode = gadgetfs_make_inode (sb, |
| 2099 | NULL, &simple_dir_operations, |
| 2100 | S_IFDIR | S_IRUGO | S_IXUGO); |
| 2101 | if (!inode) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2102 | goto enomem0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | inode->i_op = &simple_dir_inode_operations; |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2104 | if (!(d = d_alloc_root (inode))) |
| 2105 | goto enomem1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | sb->s_root = d; |
| 2107 | |
| 2108 | /* the ep0 file is named after the controller we expect; |
| 2109 | * user mode code can use it for sanity checks, like we do. |
| 2110 | */ |
| 2111 | dev = dev_new (); |
| 2112 | if (!dev) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2113 | goto enomem2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | |
| 2115 | dev->sb = sb; |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2116 | if (!gadgetfs_create_file (sb, CHIP, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | dev, &dev_init_operations, |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2118 | &dev->dentry)) |
| 2119 | goto enomem3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | |
| 2121 | /* other endpoint files are available after hardware setup, |
| 2122 | * from binding to a controller. |
| 2123 | */ |
| 2124 | the_device = dev; |
| 2125 | return 0; |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2126 | |
| 2127 | enomem3: |
| 2128 | put_dev (dev); |
| 2129 | enomem2: |
| 2130 | dput (d); |
| 2131 | enomem1: |
| 2132 | iput (inode); |
| 2133 | enomem0: |
| 2134 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | } |
| 2136 | |
| 2137 | /* "mount -t gadgetfs path /dev/gadget" ends up here */ |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 2138 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | gadgetfs_get_sb (struct file_system_type *t, int flags, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 2140 | const char *path, void *opts, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 2142 | return get_sb_single (t, flags, opts, gadgetfs_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | } |
| 2144 | |
| 2145 | static void |
| 2146 | gadgetfs_kill_sb (struct super_block *sb) |
| 2147 | { |
| 2148 | kill_litter_super (sb); |
| 2149 | if (the_device) { |
| 2150 | put_dev (the_device); |
| 2151 | the_device = NULL; |
| 2152 | } |
| 2153 | } |
| 2154 | |
| 2155 | /*----------------------------------------------------------------------*/ |
| 2156 | |
| 2157 | static struct file_system_type gadgetfs_type = { |
| 2158 | .owner = THIS_MODULE, |
| 2159 | .name = shortname, |
| 2160 | .get_sb = gadgetfs_get_sb, |
| 2161 | .kill_sb = gadgetfs_kill_sb, |
| 2162 | }; |
| 2163 | |
| 2164 | /*----------------------------------------------------------------------*/ |
| 2165 | |
| 2166 | static int __init init (void) |
| 2167 | { |
| 2168 | int status; |
| 2169 | |
| 2170 | status = register_filesystem (&gadgetfs_type); |
| 2171 | if (status == 0) |
| 2172 | pr_info ("%s: %s, version " DRIVER_VERSION "\n", |
| 2173 | shortname, driver_desc); |
| 2174 | return status; |
| 2175 | } |
| 2176 | module_init (init); |
| 2177 | |
| 2178 | static void __exit cleanup (void) |
| 2179 | { |
| 2180 | pr_debug ("unregister %s\n", shortname); |
| 2181 | unregister_filesystem (&gadgetfs_type); |
| 2182 | } |
| 2183 | module_exit (cleanup); |
| 2184 | |