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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
| 13 | |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 14 | /* #define VERBOSE_DEBUG */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/pagemap.h> |
| 20 | #include <linux/uts.h> |
| 21 | #include <linux/wait.h> |
| 22 | #include <linux/compiler.h> |
| 23 | #include <asm/uaccess.h> |
Alexey Dobriyan | a99bbaf | 2009-10-04 16:11:37 +0400 | [diff] [blame] | 24 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/slab.h> |
Milan Svoboda | e22fc27 | 2006-08-08 22:23:12 -0700 | [diff] [blame] | 26 | #include <linux/poll.h> |
Zach Brown | a80bf61 | 2013-05-07 16:18:23 -0700 | [diff] [blame] | 27 | #include <linux/mmu_context.h> |
Kent Overstreet | 4e179bc | 2013-05-07 16:18:33 -0700 | [diff] [blame] | 28 | #include <linux/aio.h> |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 29 | #include <linux/uio.h> |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 30 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/device.h> |
| 32 | #include <linux/moduleparam.h> |
| 33 | |
David Brownell | a5262dc | 2007-05-14 19:36:41 -0700 | [diff] [blame] | 34 | #include <linux/usb/gadgetfs.h> |
David Brownell | 9454a57 | 2007-10-04 18:05:17 -0700 | [diff] [blame] | 35 | #include <linux/usb/gadget.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | |
| 38 | /* |
| 39 | * The gadgetfs API maps each endpoint to a file descriptor so that you |
| 40 | * can use standard synchronous read/write calls for I/O. There's some |
| 41 | * O_NONBLOCK and O_ASYNC/FASYNC style i/o support. Example usermode |
| 42 | * drivers show how this works in practice. You can also use AIO to |
| 43 | * eliminate I/O gaps between requests, to help when streaming data. |
| 44 | * |
| 45 | * Key parts that must be USB-specific are protocols defining how the |
| 46 | * read/write operations relate to the hardware state machines. There |
| 47 | * are two types of files. One type is for the device, implementing ep0. |
| 48 | * The other type is for each IN or OUT endpoint. In both cases, the |
| 49 | * user mode driver must configure the hardware before using it. |
| 50 | * |
| 51 | * - First, dev_config() is called when /dev/gadget/$CHIP is configured |
| 52 | * (by writing configuration and device descriptors). Afterwards it |
| 53 | * may serve as a source of device events, used to handle all control |
| 54 | * requests other than basic enumeration. |
| 55 | * |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 56 | * - Then, after a SET_CONFIGURATION control request, ep_config() is |
| 57 | * called when each /dev/gadget/ep* file is configured (by writing |
| 58 | * endpoint descriptors). Afterwards these files are used to write() |
| 59 | * IN data or to read() OUT data. To halt the endpoint, a "wrong |
| 60 | * direction" request is issued (like reading an IN endpoint). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | * |
| 62 | * Unlike "usbfs" the only ioctl()s are for things that are rare, and maybe |
| 63 | * not possible on all hardware. For example, precise fault handling with |
| 64 | * respect to data left in endpoint fifos after aborted operations; or |
| 65 | * selective clearing of endpoint halts, to implement SET_INTERFACE. |
| 66 | */ |
| 67 | |
| 68 | #define DRIVER_DESC "USB Gadget filesystem" |
| 69 | #define DRIVER_VERSION "24 Aug 2004" |
| 70 | |
| 71 | static const char driver_desc [] = DRIVER_DESC; |
| 72 | static const char shortname [] = "gadgetfs"; |
| 73 | |
| 74 | MODULE_DESCRIPTION (DRIVER_DESC); |
| 75 | MODULE_AUTHOR ("David Brownell"); |
| 76 | MODULE_LICENSE ("GPL"); |
| 77 | |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 78 | static int ep_open(struct inode *, struct file *); |
| 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
| 81 | /*----------------------------------------------------------------------*/ |
| 82 | |
| 83 | #define GADGETFS_MAGIC 0xaee71ee7 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | /* /dev/gadget/$CHIP represents ep0 and the whole device */ |
| 86 | enum ep0_state { |
| 87 | /* DISBLED is the initial state. |
| 88 | */ |
| 89 | STATE_DEV_DISABLED = 0, |
| 90 | |
| 91 | /* Only one open() of /dev/gadget/$CHIP; only one file tracks |
| 92 | * ep0/device i/o modes and binding to the controller. Driver |
| 93 | * must always write descriptors to initialize the device, then |
| 94 | * the device becomes UNCONNECTED until enumeration. |
| 95 | */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 96 | STATE_DEV_OPENED, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | /* From then on, ep0 fd is in either of two basic modes: |
| 99 | * - (UN)CONNECTED: read usb_gadgetfs_event(s) from it |
| 100 | * - SETUP: read/write will transfer control data and succeed; |
| 101 | * or if "wrong direction", performs protocol stall |
| 102 | */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 103 | STATE_DEV_UNCONNECTED, |
| 104 | STATE_DEV_CONNECTED, |
| 105 | STATE_DEV_SETUP, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
| 107 | /* UNBOUND means the driver closed ep0, so the device won't be |
| 108 | * accessible again (DEV_DISABLED) until all fds are closed. |
| 109 | */ |
| 110 | STATE_DEV_UNBOUND, |
| 111 | }; |
| 112 | |
| 113 | /* enough for the whole queue: most events invalidate others */ |
| 114 | #define N_EVENT 5 |
| 115 | |
| 116 | struct dev_data { |
| 117 | spinlock_t lock; |
| 118 | atomic_t count; |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 119 | int udc_usage; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 120 | enum ep0_state state; /* P: lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | struct usb_gadgetfs_event event [N_EVENT]; |
| 122 | unsigned ev_next; |
| 123 | struct fasync_struct *fasync; |
| 124 | u8 current_config; |
| 125 | |
| 126 | /* drivers reading ep0 MUST handle control requests (SETUP) |
| 127 | * reported that way; else the host will time out. |
| 128 | */ |
| 129 | unsigned usermode_setup : 1, |
| 130 | setup_in : 1, |
| 131 | setup_can_stall : 1, |
| 132 | setup_out_ready : 1, |
| 133 | setup_out_error : 1, |
Marek Szyprowski | 7b0a271 | 2016-02-18 08:59:26 +0100 | [diff] [blame] | 134 | setup_abort : 1, |
| 135 | gadget_registered : 1; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 136 | unsigned setup_wLength; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
| 138 | /* the rest is basically write-once */ |
| 139 | struct usb_config_descriptor *config, *hs_config; |
| 140 | struct usb_device_descriptor *dev; |
| 141 | struct usb_request *req; |
| 142 | struct usb_gadget *gadget; |
| 143 | struct list_head epfiles; |
| 144 | void *buf; |
| 145 | wait_queue_head_t wait; |
| 146 | struct super_block *sb; |
| 147 | struct dentry *dentry; |
| 148 | |
| 149 | /* except this scratch i/o buffer for ep0 */ |
| 150 | u8 rbuf [256]; |
| 151 | }; |
| 152 | |
| 153 | static inline void get_dev (struct dev_data *data) |
| 154 | { |
| 155 | atomic_inc (&data->count); |
| 156 | } |
| 157 | |
| 158 | static void put_dev (struct dev_data *data) |
| 159 | { |
| 160 | if (likely (!atomic_dec_and_test (&data->count))) |
| 161 | return; |
| 162 | /* needs no more cleanup */ |
| 163 | BUG_ON (waitqueue_active (&data->wait)); |
| 164 | kfree (data); |
| 165 | } |
| 166 | |
| 167 | static struct dev_data *dev_new (void) |
| 168 | { |
| 169 | struct dev_data *dev; |
| 170 | |
Eric Sesterhenn | 7039f42 | 2006-02-27 13:34:10 -0800 | [diff] [blame] | 171 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | if (!dev) |
| 173 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | dev->state = STATE_DEV_DISABLED; |
| 175 | atomic_set (&dev->count, 1); |
| 176 | spin_lock_init (&dev->lock); |
| 177 | INIT_LIST_HEAD (&dev->epfiles); |
| 178 | init_waitqueue_head (&dev->wait); |
| 179 | return dev; |
| 180 | } |
| 181 | |
| 182 | /*----------------------------------------------------------------------*/ |
| 183 | |
| 184 | /* other /dev/gadget/$ENDPOINT files represent endpoints */ |
| 185 | enum ep_state { |
| 186 | STATE_EP_DISABLED = 0, |
| 187 | STATE_EP_READY, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | STATE_EP_ENABLED, |
| 189 | STATE_EP_UNBOUND, |
| 190 | }; |
| 191 | |
| 192 | struct ep_data { |
Thomas Gleixner | a79df50 | 2010-01-29 20:38:59 +0000 | [diff] [blame] | 193 | struct mutex lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | enum ep_state state; |
| 195 | atomic_t count; |
| 196 | struct dev_data *dev; |
| 197 | /* must hold dev->lock before accessing ep or req */ |
| 198 | struct usb_ep *ep; |
| 199 | struct usb_request *req; |
| 200 | ssize_t status; |
| 201 | char name [16]; |
| 202 | struct usb_endpoint_descriptor desc, hs_desc; |
| 203 | struct list_head epfiles; |
| 204 | wait_queue_head_t wait; |
| 205 | struct dentry *dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | }; |
| 207 | |
| 208 | static inline void get_ep (struct ep_data *data) |
| 209 | { |
| 210 | atomic_inc (&data->count); |
| 211 | } |
| 212 | |
| 213 | static void put_ep (struct ep_data *data) |
| 214 | { |
| 215 | if (likely (!atomic_dec_and_test (&data->count))) |
| 216 | return; |
| 217 | put_dev (data->dev); |
| 218 | /* needs no more cleanup */ |
| 219 | BUG_ON (!list_empty (&data->epfiles)); |
| 220 | BUG_ON (waitqueue_active (&data->wait)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | kfree (data); |
| 222 | } |
| 223 | |
| 224 | /*----------------------------------------------------------------------*/ |
| 225 | |
| 226 | /* most "how to use the hardware" policy choices are in userspace: |
| 227 | * mapping endpoint roles (which the driver needs) to the capabilities |
| 228 | * which the usb controller has. most of those capabilities are exposed |
| 229 | * implicitly, starting with the driver name and then endpoint names. |
| 230 | */ |
| 231 | |
| 232 | static const char *CHIP; |
| 233 | |
| 234 | /*----------------------------------------------------------------------*/ |
| 235 | |
| 236 | /* NOTE: don't use dev_printk calls before binding to the gadget |
| 237 | * at the end of ep0 configuration, or after unbind. |
| 238 | */ |
| 239 | |
| 240 | /* too wordy: dev_printk(level , &(d)->gadget->dev , fmt , ## args) */ |
| 241 | #define xprintk(d,level,fmt,args...) \ |
| 242 | printk(level "%s: " fmt , shortname , ## args) |
| 243 | |
| 244 | #ifdef DEBUG |
| 245 | #define DBG(dev,fmt,args...) \ |
| 246 | xprintk(dev , KERN_DEBUG , fmt , ## args) |
| 247 | #else |
| 248 | #define DBG(dev,fmt,args...) \ |
| 249 | do { } while (0) |
| 250 | #endif /* DEBUG */ |
| 251 | |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 252 | #ifdef VERBOSE_DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | #define VDEBUG DBG |
| 254 | #else |
| 255 | #define VDEBUG(dev,fmt,args...) \ |
| 256 | do { } while (0) |
| 257 | #endif /* DEBUG */ |
| 258 | |
| 259 | #define ERROR(dev,fmt,args...) \ |
| 260 | xprintk(dev , KERN_ERR , fmt , ## args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | #define INFO(dev,fmt,args...) \ |
| 262 | xprintk(dev , KERN_INFO , fmt , ## args) |
| 263 | |
| 264 | |
| 265 | /*----------------------------------------------------------------------*/ |
| 266 | |
| 267 | /* SYNCHRONOUS ENDPOINT OPERATIONS (bulk/intr/iso) |
| 268 | * |
| 269 | * After opening, configure non-control endpoints. Then use normal |
| 270 | * stream read() and write() requests; and maybe ioctl() to get more |
Steven Cole | 093cf72 | 2005-05-03 19:07:24 -0600 | [diff] [blame] | 271 | * precise FIFO status when recovering from cancellation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | */ |
| 273 | |
| 274 | static void epio_complete (struct usb_ep *ep, struct usb_request *req) |
| 275 | { |
| 276 | struct ep_data *epdata = ep->driver_data; |
| 277 | |
| 278 | if (!req->context) |
| 279 | return; |
| 280 | if (req->status) |
| 281 | epdata->status = req->status; |
| 282 | else |
| 283 | epdata->status = req->actual; |
| 284 | complete ((struct completion *)req->context); |
| 285 | } |
| 286 | |
| 287 | /* tasklock endpoint, returning when it's connected. |
| 288 | * still need dev->lock to use epdata->ep. |
| 289 | */ |
| 290 | static int |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 291 | get_ready_ep (unsigned f_flags, struct ep_data *epdata, bool is_write) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | { |
| 293 | int val; |
| 294 | |
| 295 | if (f_flags & O_NONBLOCK) { |
Thomas Gleixner | a79df50 | 2010-01-29 20:38:59 +0000 | [diff] [blame] | 296 | if (!mutex_trylock(&epdata->lock)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | goto nonblock; |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 298 | if (epdata->state != STATE_EP_ENABLED && |
| 299 | (!is_write || epdata->state != STATE_EP_READY)) { |
Thomas Gleixner | a79df50 | 2010-01-29 20:38:59 +0000 | [diff] [blame] | 300 | mutex_unlock(&epdata->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | nonblock: |
| 302 | val = -EAGAIN; |
| 303 | } else |
| 304 | val = 0; |
| 305 | return val; |
| 306 | } |
| 307 | |
Thomas Gleixner | a79df50 | 2010-01-29 20:38:59 +0000 | [diff] [blame] | 308 | val = mutex_lock_interruptible(&epdata->lock); |
| 309 | if (val < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | return val; |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | switch (epdata->state) { |
| 313 | case STATE_EP_ENABLED: |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 314 | return 0; |
| 315 | case STATE_EP_READY: /* not configured yet */ |
| 316 | if (is_write) |
| 317 | return 0; |
| 318 | // FALLTHRU |
| 319 | case STATE_EP_UNBOUND: /* clean disconnect */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | // case STATE_EP_DISABLED: /* "can't happen" */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | default: /* error! */ |
| 323 | pr_debug ("%s: ep %p not available, state %d\n", |
| 324 | shortname, epdata, epdata->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 326 | mutex_unlock(&epdata->lock); |
| 327 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | static int |
| 375 | ep_release (struct inode *inode, struct file *fd) |
| 376 | { |
| 377 | struct ep_data *data = fd->private_data; |
Milan Svoboda | ba307f5 | 2006-06-26 07:48:00 -0700 | [diff] [blame] | 378 | int value; |
| 379 | |
Thomas Gleixner | a79df50 | 2010-01-29 20:38:59 +0000 | [diff] [blame] | 380 | value = mutex_lock_interruptible(&data->lock); |
| 381 | if (value < 0) |
Milan Svoboda | ba307f5 | 2006-06-26 07:48:00 -0700 | [diff] [blame] | 382 | return value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
| 384 | /* clean up if this can be reopened */ |
| 385 | if (data->state != STATE_EP_UNBOUND) { |
| 386 | data->state = STATE_EP_DISABLED; |
| 387 | data->desc.bDescriptorType = 0; |
| 388 | data->hs_desc.bDescriptorType = 0; |
Pavol Kurina | 4809ecc | 2005-09-07 09:49:34 -0700 | [diff] [blame] | 389 | usb_ep_disable(data->ep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
Thomas Gleixner | a79df50 | 2010-01-29 20:38:59 +0000 | [diff] [blame] | 391 | mutex_unlock(&data->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | put_ep (data); |
| 393 | return 0; |
| 394 | } |
| 395 | |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 396 | static long ep_ioctl(struct file *fd, unsigned code, unsigned long value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | { |
| 398 | struct ep_data *data = fd->private_data; |
| 399 | int status; |
| 400 | |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 401 | if ((status = get_ready_ep (fd->f_flags, data, false)) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | return status; |
| 403 | |
| 404 | spin_lock_irq (&data->dev->lock); |
| 405 | if (likely (data->ep != NULL)) { |
| 406 | switch (code) { |
| 407 | case GADGETFS_FIFO_STATUS: |
| 408 | status = usb_ep_fifo_status (data->ep); |
| 409 | break; |
| 410 | case GADGETFS_FIFO_FLUSH: |
| 411 | usb_ep_fifo_flush (data->ep); |
| 412 | break; |
| 413 | case GADGETFS_CLEAR_HALT: |
| 414 | status = usb_ep_clear_halt (data->ep); |
| 415 | break; |
| 416 | default: |
| 417 | status = -ENOTTY; |
| 418 | } |
| 419 | } else |
| 420 | status = -ENODEV; |
| 421 | spin_unlock_irq (&data->dev->lock); |
Thomas Gleixner | a79df50 | 2010-01-29 20:38:59 +0000 | [diff] [blame] | 422 | mutex_unlock(&data->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | return status; |
| 424 | } |
| 425 | |
| 426 | /*----------------------------------------------------------------------*/ |
| 427 | |
| 428 | /* ASYNCHRONOUS ENDPOINT I/O OPERATIONS (bulk/intr/iso) */ |
| 429 | |
| 430 | struct kiocb_priv { |
| 431 | struct usb_request *req; |
| 432 | struct ep_data *epdata; |
Zach Brown | a80bf61 | 2013-05-07 16:18:23 -0700 | [diff] [blame] | 433 | struct kiocb *iocb; |
| 434 | struct mm_struct *mm; |
| 435 | struct work_struct work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | void *buf; |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 437 | struct iov_iter to; |
| 438 | const void *to_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | unsigned actual; |
| 440 | }; |
| 441 | |
Kent Overstreet | bec68faa | 2013-05-13 14:45:08 -0700 | [diff] [blame] | 442 | static int ep_aio_cancel(struct kiocb *iocb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | { |
| 444 | struct kiocb_priv *priv = iocb->private; |
| 445 | struct ep_data *epdata; |
| 446 | int value; |
| 447 | |
| 448 | local_irq_disable(); |
| 449 | epdata = priv->epdata; |
| 450 | // spin_lock(&epdata->dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | if (likely(epdata && epdata->ep && priv->req)) |
| 452 | value = usb_ep_dequeue (epdata->ep, priv->req); |
| 453 | else |
| 454 | value = -EINVAL; |
| 455 | // spin_unlock(&epdata->dev->lock); |
| 456 | local_irq_enable(); |
| 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | return value; |
| 459 | } |
| 460 | |
Zach Brown | a80bf61 | 2013-05-07 16:18:23 -0700 | [diff] [blame] | 461 | static void ep_user_copy_worker(struct work_struct *work) |
| 462 | { |
| 463 | struct kiocb_priv *priv = container_of(work, struct kiocb_priv, work); |
| 464 | struct mm_struct *mm = priv->mm; |
| 465 | struct kiocb *iocb = priv->iocb; |
| 466 | size_t ret; |
| 467 | |
| 468 | use_mm(mm); |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 469 | ret = copy_to_iter(priv->buf, priv->actual, &priv->to); |
Zach Brown | a80bf61 | 2013-05-07 16:18:23 -0700 | [diff] [blame] | 470 | unuse_mm(mm); |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 471 | if (!ret) |
| 472 | ret = -EFAULT; |
Zach Brown | a80bf61 | 2013-05-07 16:18:23 -0700 | [diff] [blame] | 473 | |
| 474 | /* completing the iocb can drop the ctx and mm, don't touch mm after */ |
Christoph Hellwig | 04b2fa9 | 2015-02-02 14:49:06 +0100 | [diff] [blame] | 475 | iocb->ki_complete(iocb, ret, ret); |
Zach Brown | a80bf61 | 2013-05-07 16:18:23 -0700 | [diff] [blame] | 476 | |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 477 | kfree(priv->buf); |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 478 | kfree(priv->to_free); |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 479 | kfree(priv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req) |
| 483 | { |
| 484 | struct kiocb *iocb = req->context; |
| 485 | struct kiocb_priv *priv = iocb->private; |
| 486 | struct ep_data *epdata = priv->epdata; |
| 487 | |
| 488 | /* lock against disconnect (and ideally, cancel) */ |
| 489 | spin_lock(&epdata->dev->lock); |
| 490 | priv->req = NULL; |
| 491 | priv->epdata = NULL; |
Alan Stern | 49631ca | 2007-01-16 23:28:48 -0800 | [diff] [blame] | 492 | |
| 493 | /* if this was a write or a read returning no data then we |
| 494 | * don't need to copy anything to userspace, so we can |
| 495 | * complete the aio request immediately. |
| 496 | */ |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 497 | if (priv->to_free == NULL || unlikely(req->actual == 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | kfree(req->buf); |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 499 | kfree(priv->to_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | kfree(priv); |
| 501 | iocb->private = NULL; |
| 502 | /* aio_complete() reports bytes-transferred _and_ faults */ |
Christoph Hellwig | 04b2fa9 | 2015-02-02 14:49:06 +0100 | [diff] [blame] | 503 | |
| 504 | iocb->ki_complete(iocb, req->actual ? req->actual : req->status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | req->status); |
| 506 | } else { |
Zach Brown | a80bf61 | 2013-05-07 16:18:23 -0700 | [diff] [blame] | 507 | /* ep_copy_to_user() won't report both; we hide some faults */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | if (unlikely(0 != req->status)) |
| 509 | DBG(epdata->dev, "%s fault %d len %d\n", |
| 510 | ep->name, req->status, req->actual); |
| 511 | |
| 512 | priv->buf = req->buf; |
| 513 | priv->actual = req->actual; |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 514 | INIT_WORK(&priv->work, ep_user_copy_worker); |
Zach Brown | a80bf61 | 2013-05-07 16:18:23 -0700 | [diff] [blame] | 515 | schedule_work(&priv->work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
| 518 | usb_ep_free_request(ep, req); |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 519 | spin_unlock(&epdata->dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | put_ep(epdata); |
| 521 | } |
| 522 | |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 523 | static ssize_t ep_aio(struct kiocb *iocb, |
| 524 | struct kiocb_priv *priv, |
| 525 | struct ep_data *epdata, |
| 526 | char *buf, |
| 527 | size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | { |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 529 | struct usb_request *req; |
| 530 | ssize_t value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | iocb->private = priv; |
Zach Brown | a80bf61 | 2013-05-07 16:18:23 -0700 | [diff] [blame] | 533 | priv->iocb = iocb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
Kent Overstreet | 0460fef | 2013-05-07 16:18:49 -0700 | [diff] [blame] | 535 | kiocb_set_cancel_fn(iocb, ep_aio_cancel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | get_ep(epdata); |
| 537 | priv->epdata = epdata; |
| 538 | priv->actual = 0; |
Zach Brown | a80bf61 | 2013-05-07 16:18:23 -0700 | [diff] [blame] | 539 | priv->mm = current->mm; /* mm teardown waits for iocbs in exit_aio() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
| 541 | /* each kiocb is coupled to one usb_request, but we can't |
| 542 | * allocate or submit those if the host disconnected. |
| 543 | */ |
| 544 | spin_lock_irq(&epdata->dev->lock); |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 545 | value = -ENODEV; |
Mathieu Laurendeau | 327b21da | 2016-07-15 14:58:41 +0200 | [diff] [blame] | 546 | if (unlikely(epdata->ep == NULL)) |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 547 | goto fail; |
| 548 | |
| 549 | req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC); |
| 550 | value = -ENOMEM; |
| 551 | if (unlikely(!req)) |
| 552 | goto fail; |
| 553 | |
| 554 | priv->req = req; |
| 555 | req->buf = buf; |
| 556 | req->length = len; |
| 557 | req->complete = ep_aio_complete; |
| 558 | req->context = iocb; |
| 559 | value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC); |
| 560 | if (unlikely(0 != value)) { |
| 561 | usb_ep_free_request(epdata->ep, req); |
| 562 | goto fail; |
| 563 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | spin_unlock_irq(&epdata->dev->lock); |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 565 | return -EIOCBQUEUED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 567 | fail: |
| 568 | spin_unlock_irq(&epdata->dev->lock); |
| 569 | kfree(priv->to_free); |
| 570 | kfree(priv); |
| 571 | put_ep(epdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | return value; |
| 573 | } |
| 574 | |
| 575 | static ssize_t |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 576 | ep_read_iter(struct kiocb *iocb, struct iov_iter *to) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | { |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 578 | struct file *file = iocb->ki_filp; |
| 579 | struct ep_data *epdata = file->private_data; |
| 580 | size_t len = iov_iter_count(to); |
| 581 | ssize_t value; |
| 582 | char *buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 584 | if ((value = get_ready_ep(file->f_flags, epdata, false)) < 0) |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 585 | return value; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 586 | |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 587 | /* halt any endpoint by doing a "wrong direction" i/o call */ |
| 588 | if (usb_endpoint_dir_in(&epdata->desc)) { |
| 589 | if (usb_endpoint_xfer_isoc(&epdata->desc) || |
| 590 | !is_sync_kiocb(iocb)) { |
| 591 | mutex_unlock(&epdata->lock); |
| 592 | return -EINVAL; |
| 593 | } |
| 594 | DBG (epdata->dev, "%s halt\n", epdata->name); |
| 595 | spin_lock_irq(&epdata->dev->lock); |
| 596 | if (likely(epdata->ep != NULL)) |
| 597 | usb_ep_set_halt(epdata->ep); |
| 598 | spin_unlock_irq(&epdata->dev->lock); |
| 599 | mutex_unlock(&epdata->lock); |
| 600 | return -EBADMSG; |
| 601 | } |
| 602 | |
| 603 | buf = kmalloc(len, GFP_KERNEL); |
| 604 | if (unlikely(!buf)) { |
| 605 | mutex_unlock(&epdata->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | return -ENOMEM; |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 607 | } |
| 608 | if (is_sync_kiocb(iocb)) { |
| 609 | value = ep_io(epdata, buf, len); |
Binyamin Sharet | 63196e9 | 2016-07-07 22:22:04 +0300 | [diff] [blame] | 610 | if (value >= 0 && (copy_to_iter(buf, value, to) != value)) |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 611 | value = -EFAULT; |
| 612 | } else { |
| 613 | struct kiocb_priv *priv = kzalloc(sizeof *priv, GFP_KERNEL); |
| 614 | value = -ENOMEM; |
| 615 | if (!priv) |
| 616 | goto fail; |
| 617 | priv->to_free = dup_iter(&priv->to, to, GFP_KERNEL); |
| 618 | if (!priv->to_free) { |
| 619 | kfree(priv); |
| 620 | goto fail; |
| 621 | } |
| 622 | value = ep_aio(iocb, priv, epdata, buf, len); |
| 623 | if (value == -EIOCBQUEUED) |
| 624 | buf = NULL; |
| 625 | } |
| 626 | fail: |
| 627 | kfree(buf); |
| 628 | mutex_unlock(&epdata->lock); |
| 629 | return value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | } |
| 631 | |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 632 | static ssize_t ep_config(struct ep_data *, const char *, size_t); |
| 633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | static ssize_t |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 635 | ep_write_iter(struct kiocb *iocb, struct iov_iter *from) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | { |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 637 | struct file *file = iocb->ki_filp; |
| 638 | struct ep_data *epdata = file->private_data; |
| 639 | size_t len = iov_iter_count(from); |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 640 | bool configured; |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 641 | ssize_t value; |
| 642 | char *buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 644 | if ((value = get_ready_ep(file->f_flags, epdata, true)) < 0) |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 645 | return value; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 646 | |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 647 | configured = epdata->state == STATE_EP_ENABLED; |
| 648 | |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 649 | /* halt any endpoint by doing a "wrong direction" i/o call */ |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 650 | if (configured && !usb_endpoint_dir_in(&epdata->desc)) { |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 651 | if (usb_endpoint_xfer_isoc(&epdata->desc) || |
| 652 | !is_sync_kiocb(iocb)) { |
| 653 | mutex_unlock(&epdata->lock); |
| 654 | return -EINVAL; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 655 | } |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 656 | DBG (epdata->dev, "%s halt\n", epdata->name); |
| 657 | spin_lock_irq(&epdata->dev->lock); |
| 658 | if (likely(epdata->ep != NULL)) |
| 659 | usb_ep_set_halt(epdata->ep); |
| 660 | spin_unlock_irq(&epdata->dev->lock); |
| 661 | mutex_unlock(&epdata->lock); |
| 662 | return -EBADMSG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 664 | |
| 665 | buf = kmalloc(len, GFP_KERNEL); |
| 666 | if (unlikely(!buf)) { |
| 667 | mutex_unlock(&epdata->lock); |
| 668 | return -ENOMEM; |
| 669 | } |
| 670 | |
| 671 | if (unlikely(copy_from_iter(buf, len, from) != len)) { |
| 672 | value = -EFAULT; |
| 673 | goto out; |
| 674 | } |
| 675 | |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 676 | if (unlikely(!configured)) { |
| 677 | value = ep_config(epdata, buf, len); |
| 678 | } else if (is_sync_kiocb(iocb)) { |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 679 | value = ep_io(epdata, buf, len); |
| 680 | } else { |
| 681 | struct kiocb_priv *priv = kzalloc(sizeof *priv, GFP_KERNEL); |
| 682 | value = -ENOMEM; |
| 683 | if (priv) { |
| 684 | value = ep_aio(iocb, priv, epdata, buf, len); |
| 685 | if (value == -EIOCBQUEUED) |
| 686 | buf = NULL; |
| 687 | } |
| 688 | } |
| 689 | out: |
| 690 | kfree(buf); |
| 691 | mutex_unlock(&epdata->lock); |
| 692 | return value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | } |
| 694 | |
| 695 | /*----------------------------------------------------------------------*/ |
| 696 | |
| 697 | /* used after endpoint configuration */ |
Luiz Fernando N. Capitulino | 066202d | 2006-08-05 20:37:11 -0300 | [diff] [blame] | 698 | static const struct file_operations ep_io_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 701 | .open = ep_open, |
| 702 | .release = ep_release, |
| 703 | .llseek = no_llseek, |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 704 | .unlocked_ioctl = ep_ioctl, |
Al Viro | 7fe3976 | 2015-02-07 00:30:23 -0500 | [diff] [blame] | 705 | .read_iter = ep_read_iter, |
| 706 | .write_iter = ep_write_iter, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | }; |
| 708 | |
| 709 | /* ENDPOINT INITIALIZATION |
| 710 | * |
| 711 | * fd = open ("/dev/gadget/$ENDPOINT", O_RDWR) |
| 712 | * status = write (fd, descriptors, sizeof descriptors) |
| 713 | * |
| 714 | * That write establishes the endpoint configuration, configuring |
| 715 | * the controller to process bulk, interrupt, or isochronous transfers |
| 716 | * at the right maxpacket size, and so on. |
| 717 | * |
| 718 | * The descriptors are message type 1, identified by a host order u32 |
| 719 | * at the beginning of what's written. Descriptor order is: full/low |
| 720 | * speed descriptor, then optional high speed descriptor. |
| 721 | */ |
| 722 | static ssize_t |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 723 | ep_config (struct ep_data *data, const char *buf, size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | struct usb_ep *ep; |
| 726 | u32 tag; |
Milan Svoboda | 8a7471a | 2006-06-26 07:19:00 -0700 | [diff] [blame] | 727 | int value, length = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | if (data->state != STATE_EP_READY) { |
| 730 | value = -EL2HLT; |
| 731 | goto fail; |
| 732 | } |
| 733 | |
| 734 | value = len; |
| 735 | if (len < USB_DT_ENDPOINT_SIZE + 4) |
| 736 | goto fail0; |
| 737 | |
| 738 | /* we might need to change message format someday */ |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 739 | memcpy(&tag, buf, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | if (tag != 1) { |
| 741 | DBG(data->dev, "config %s, bad tag %d\n", data->name, tag); |
| 742 | goto fail0; |
| 743 | } |
| 744 | buf += 4; |
| 745 | len -= 4; |
| 746 | |
| 747 | /* NOTE: audio endpoint extensions not accepted here; |
| 748 | * just don't include the extra bytes. |
| 749 | */ |
| 750 | |
| 751 | /* full/low speed descriptor, then high speed */ |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 752 | memcpy(&data->desc, buf, USB_DT_ENDPOINT_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | if (data->desc.bLength != USB_DT_ENDPOINT_SIZE |
| 754 | || data->desc.bDescriptorType != USB_DT_ENDPOINT) |
| 755 | goto fail0; |
| 756 | if (len != USB_DT_ENDPOINT_SIZE) { |
| 757 | if (len != 2 * USB_DT_ENDPOINT_SIZE) |
| 758 | goto fail0; |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 759 | memcpy(&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE, |
| 760 | USB_DT_ENDPOINT_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE |
| 762 | || data->hs_desc.bDescriptorType |
| 763 | != USB_DT_ENDPOINT) { |
| 764 | DBG(data->dev, "config %s, bad hs length or type\n", |
| 765 | data->name); |
| 766 | goto fail0; |
| 767 | } |
| 768 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
| 770 | spin_lock_irq (&data->dev->lock); |
| 771 | if (data->dev->state == STATE_DEV_UNBOUND) { |
| 772 | value = -ENOENT; |
| 773 | goto gone; |
Greg Kroah-Hartman | 1ee7eea | 2015-04-30 11:32:54 +0200 | [diff] [blame] | 774 | } else { |
| 775 | ep = data->ep; |
| 776 | if (ep == NULL) { |
| 777 | value = -ENODEV; |
| 778 | goto gone; |
| 779 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | } |
| 781 | switch (data->dev->gadget->speed) { |
| 782 | case USB_SPEED_LOW: |
| 783 | case USB_SPEED_FULL: |
Tatyana Brokhman | 72c973d | 2011-06-28 16:33:48 +0300 | [diff] [blame] | 784 | ep->desc = &data->desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | case USB_SPEED_HIGH: |
| 787 | /* fails if caller didn't provide that descriptor... */ |
Tatyana Brokhman | 72c973d | 2011-06-28 16:33:48 +0300 | [diff] [blame] | 788 | ep->desc = &data->hs_desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | default: |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 791 | DBG(data->dev, "unconnected, %s init abandoned\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | data->name); |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 793 | value = -EINVAL; |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 794 | goto gone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | } |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 796 | value = usb_ep_enable(ep); |
Milan Svoboda | 8a7471a | 2006-06-26 07:19:00 -0700 | [diff] [blame] | 797 | if (value == 0) { |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 798 | data->state = STATE_EP_ENABLED; |
Milan Svoboda | 8a7471a | 2006-06-26 07:19:00 -0700 | [diff] [blame] | 799 | value = length; |
| 800 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | gone: |
| 802 | spin_unlock_irq (&data->dev->lock); |
| 803 | if (value < 0) { |
| 804 | fail: |
| 805 | data->desc.bDescriptorType = 0; |
| 806 | data->hs_desc.bDescriptorType = 0; |
| 807 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | return value; |
| 809 | fail0: |
| 810 | value = -EINVAL; |
| 811 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | } |
| 813 | |
| 814 | static int |
| 815 | ep_open (struct inode *inode, struct file *fd) |
| 816 | { |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 817 | struct ep_data *data = inode->i_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | int value = -EBUSY; |
| 819 | |
Thomas Gleixner | a79df50 | 2010-01-29 20:38:59 +0000 | [diff] [blame] | 820 | if (mutex_lock_interruptible(&data->lock) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | return -EINTR; |
| 822 | spin_lock_irq (&data->dev->lock); |
| 823 | if (data->dev->state == STATE_DEV_UNBOUND) |
| 824 | value = -ENOENT; |
| 825 | else if (data->state == STATE_EP_DISABLED) { |
| 826 | value = 0; |
| 827 | data->state = STATE_EP_READY; |
| 828 | get_ep (data); |
| 829 | fd->private_data = data; |
| 830 | VDEBUG (data->dev, "%s ready\n", data->name); |
| 831 | } else |
| 832 | DBG (data->dev, "%s state %d\n", |
| 833 | data->name, data->state); |
| 834 | spin_unlock_irq (&data->dev->lock); |
Thomas Gleixner | a79df50 | 2010-01-29 20:38:59 +0000 | [diff] [blame] | 835 | mutex_unlock(&data->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | return value; |
| 837 | } |
| 838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | /*----------------------------------------------------------------------*/ |
| 840 | |
| 841 | /* EP0 IMPLEMENTATION can be partly in userspace. |
| 842 | * |
| 843 | * Drivers that use this facility receive various events, including |
| 844 | * control requests the kernel doesn't handle. Drivers that don't |
| 845 | * use this facility may be too simple-minded for real applications. |
| 846 | */ |
| 847 | |
| 848 | static inline void ep0_readable (struct dev_data *dev) |
| 849 | { |
| 850 | wake_up (&dev->wait); |
| 851 | kill_fasync (&dev->fasync, SIGIO, POLL_IN); |
| 852 | } |
| 853 | |
| 854 | static void clean_req (struct usb_ep *ep, struct usb_request *req) |
| 855 | { |
| 856 | struct dev_data *dev = ep->driver_data; |
| 857 | |
| 858 | if (req->buf != dev->rbuf) { |
David Brownell | 9d8bab5 | 2007-07-01 11:04:54 -0700 | [diff] [blame] | 859 | kfree(req->buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | req->buf = dev->rbuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
| 862 | req->complete = epio_complete; |
| 863 | dev->setup_out_ready = 0; |
| 864 | } |
| 865 | |
| 866 | static void ep0_complete (struct usb_ep *ep, struct usb_request *req) |
| 867 | { |
| 868 | struct dev_data *dev = ep->driver_data; |
David Brownell | 5b89db02 | 2007-01-16 22:56:26 -0800 | [diff] [blame] | 869 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | int free = 1; |
| 871 | |
| 872 | /* for control OUT, data must still get to userspace */ |
David Brownell | 5b89db02 | 2007-01-16 22:56:26 -0800 | [diff] [blame] | 873 | spin_lock_irqsave(&dev->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | if (!dev->setup_in) { |
| 875 | dev->setup_out_error = (req->status != 0); |
| 876 | if (!dev->setup_out_error) |
| 877 | free = 0; |
| 878 | dev->setup_out_ready = 1; |
| 879 | ep0_readable (dev); |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 880 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
| 882 | /* clean up as appropriate */ |
| 883 | if (free && req->buf != &dev->rbuf) |
| 884 | clean_req (ep, req); |
| 885 | req->complete = epio_complete; |
David Brownell | 5b89db02 | 2007-01-16 22:56:26 -0800 | [diff] [blame] | 886 | spin_unlock_irqrestore(&dev->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | } |
| 888 | |
| 889 | static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len) |
| 890 | { |
| 891 | struct dev_data *dev = ep->driver_data; |
| 892 | |
| 893 | if (dev->setup_out_ready) { |
| 894 | DBG (dev, "ep0 request busy!\n"); |
| 895 | return -EBUSY; |
| 896 | } |
| 897 | if (len > sizeof (dev->rbuf)) |
David Brownell | 9d8bab5 | 2007-07-01 11:04:54 -0700 | [diff] [blame] | 898 | req->buf = kmalloc(len, GFP_ATOMIC); |
David Brownell | a947522 | 2007-07-30 12:31:07 -0700 | [diff] [blame] | 899 | if (req->buf == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | req->buf = dev->rbuf; |
| 901 | return -ENOMEM; |
| 902 | } |
| 903 | req->complete = ep0_complete; |
| 904 | req->length = len; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 905 | req->zero = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | return 0; |
| 907 | } |
| 908 | |
| 909 | static ssize_t |
| 910 | ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr) |
| 911 | { |
| 912 | struct dev_data *dev = fd->private_data; |
| 913 | ssize_t retval; |
| 914 | enum ep0_state state; |
| 915 | |
| 916 | spin_lock_irq (&dev->lock); |
Alan Stern | 96b62a5 | 2015-03-04 10:31:50 -0500 | [diff] [blame] | 917 | if (dev->state <= STATE_DEV_OPENED) { |
| 918 | retval = -EINVAL; |
| 919 | goto done; |
| 920 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
| 922 | /* report fd mode change before acting on it */ |
| 923 | if (dev->setup_abort) { |
| 924 | dev->setup_abort = 0; |
| 925 | retval = -EIDRM; |
| 926 | goto done; |
| 927 | } |
| 928 | |
| 929 | /* control DATA stage */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 930 | if ((state = dev->state) == STATE_DEV_SETUP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | |
| 932 | if (dev->setup_in) { /* stall IN */ |
| 933 | VDEBUG(dev, "ep0in stall\n"); |
| 934 | (void) usb_ep_set_halt (dev->gadget->ep0); |
| 935 | retval = -EL2HLT; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 936 | dev->state = STATE_DEV_CONNECTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | |
| 938 | } else if (len == 0) { /* ack SET_CONFIGURATION etc */ |
| 939 | struct usb_ep *ep = dev->gadget->ep0; |
| 940 | struct usb_request *req = dev->req; |
| 941 | |
Bin Liu | d246dcb | 2016-05-26 11:43:45 -0500 | [diff] [blame] | 942 | if ((retval = setup_req (ep, req, 0)) == 0) { |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 943 | ++dev->udc_usage; |
Bin Liu | d246dcb | 2016-05-26 11:43:45 -0500 | [diff] [blame] | 944 | spin_unlock_irq (&dev->lock); |
| 945 | retval = usb_ep_queue (ep, req, GFP_KERNEL); |
| 946 | spin_lock_irq (&dev->lock); |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 947 | --dev->udc_usage; |
Bin Liu | d246dcb | 2016-05-26 11:43:45 -0500 | [diff] [blame] | 948 | } |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 949 | dev->state = STATE_DEV_CONNECTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | |
| 951 | /* assume that was SET_CONFIGURATION */ |
| 952 | if (dev->current_config) { |
| 953 | unsigned power; |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 954 | |
| 955 | if (gadget_is_dualspeed(dev->gadget) |
| 956 | && (dev->gadget->speed |
| 957 | == USB_SPEED_HIGH)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | power = dev->hs_config->bMaxPower; |
| 959 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | power = dev->config->bMaxPower; |
| 961 | usb_gadget_vbus_draw(dev->gadget, 2 * power); |
| 962 | } |
| 963 | |
| 964 | } else { /* collect OUT data */ |
| 965 | if ((fd->f_flags & O_NONBLOCK) != 0 |
| 966 | && !dev->setup_out_ready) { |
| 967 | retval = -EAGAIN; |
| 968 | goto done; |
| 969 | } |
| 970 | spin_unlock_irq (&dev->lock); |
| 971 | retval = wait_event_interruptible (dev->wait, |
| 972 | dev->setup_out_ready != 0); |
| 973 | |
| 974 | /* FIXME state could change from under us */ |
| 975 | spin_lock_irq (&dev->lock); |
| 976 | if (retval) |
| 977 | goto done; |
David Brownell | 5b89db02 | 2007-01-16 22:56:26 -0800 | [diff] [blame] | 978 | |
| 979 | if (dev->state != STATE_DEV_SETUP) { |
| 980 | retval = -ECANCELED; |
| 981 | goto done; |
| 982 | } |
| 983 | dev->state = STATE_DEV_CONNECTED; |
| 984 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | if (dev->setup_out_error) |
| 986 | retval = -EIO; |
| 987 | else { |
| 988 | len = min (len, (size_t)dev->req->actual); |
Alan Stern | 7f85003 | 2017-09-21 16:12:01 -0400 | [diff] [blame] | 989 | ++dev->udc_usage; |
| 990 | spin_unlock_irq(&dev->lock); |
Skip Hansen | 997694d | 2006-09-01 15:26:27 -0700 | [diff] [blame] | 991 | if (copy_to_user (buf, dev->req->buf, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | retval = -EFAULT; |
Thomas Faber | 85b4b3c | 2012-03-02 09:41:50 +0100 | [diff] [blame] | 993 | else |
| 994 | retval = len; |
Alan Stern | 7f85003 | 2017-09-21 16:12:01 -0400 | [diff] [blame] | 995 | spin_lock_irq(&dev->lock); |
| 996 | --dev->udc_usage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | clean_req (dev->gadget->ep0, dev->req); |
| 998 | /* NOTE userspace can't yet choose to stall */ |
| 999 | } |
| 1000 | } |
| 1001 | goto done; |
| 1002 | } |
| 1003 | |
| 1004 | /* else normal: return event data */ |
| 1005 | if (len < sizeof dev->event [0]) { |
| 1006 | retval = -EINVAL; |
| 1007 | goto done; |
| 1008 | } |
| 1009 | len -= len % sizeof (struct usb_gadgetfs_event); |
| 1010 | dev->usermode_setup = 1; |
| 1011 | |
| 1012 | scan: |
| 1013 | /* return queued events right away */ |
| 1014 | if (dev->ev_next != 0) { |
| 1015 | unsigned i, n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | n = len / sizeof (struct usb_gadgetfs_event); |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1018 | if (dev->ev_next < n) |
| 1019 | n = dev->ev_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1021 | /* ep0 i/o has special semantics during STATE_DEV_SETUP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | for (i = 0; i < n; i++) { |
| 1023 | if (dev->event [i].type == GADGETFS_SETUP) { |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1024 | dev->state = STATE_DEV_SETUP; |
| 1025 | n = i + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | break; |
| 1027 | } |
| 1028 | } |
| 1029 | spin_unlock_irq (&dev->lock); |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1030 | len = n * sizeof (struct usb_gadgetfs_event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | if (copy_to_user (buf, &dev->event, len)) |
| 1032 | retval = -EFAULT; |
| 1033 | else |
| 1034 | retval = len; |
| 1035 | if (len > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | /* NOTE this doesn't guard against broken drivers; |
| 1037 | * concurrent ep0 readers may lose events. |
| 1038 | */ |
| 1039 | spin_lock_irq (&dev->lock); |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1040 | if (dev->ev_next > n) { |
| 1041 | memmove(&dev->event[0], &dev->event[n], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | sizeof (struct usb_gadgetfs_event) |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1043 | * (dev->ev_next - n)); |
| 1044 | } |
| 1045 | dev->ev_next -= n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | spin_unlock_irq (&dev->lock); |
| 1047 | } |
| 1048 | return retval; |
| 1049 | } |
| 1050 | if (fd->f_flags & O_NONBLOCK) { |
| 1051 | retval = -EAGAIN; |
| 1052 | goto done; |
| 1053 | } |
| 1054 | |
| 1055 | switch (state) { |
| 1056 | default: |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1057 | DBG (dev, "fail %s, state %d\n", __func__, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | retval = -ESRCH; |
| 1059 | break; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1060 | case STATE_DEV_UNCONNECTED: |
| 1061 | case STATE_DEV_CONNECTED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | spin_unlock_irq (&dev->lock); |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1063 | DBG (dev, "%s wait\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
| 1065 | /* wait for events */ |
| 1066 | retval = wait_event_interruptible (dev->wait, |
| 1067 | dev->ev_next != 0); |
| 1068 | if (retval < 0) |
| 1069 | return retval; |
| 1070 | spin_lock_irq (&dev->lock); |
| 1071 | goto scan; |
| 1072 | } |
| 1073 | |
| 1074 | done: |
| 1075 | spin_unlock_irq (&dev->lock); |
| 1076 | return retval; |
| 1077 | } |
| 1078 | |
| 1079 | static struct usb_gadgetfs_event * |
| 1080 | next_event (struct dev_data *dev, enum usb_gadgetfs_event_type type) |
| 1081 | { |
| 1082 | struct usb_gadgetfs_event *event; |
| 1083 | unsigned i; |
| 1084 | |
| 1085 | switch (type) { |
| 1086 | /* these events purge the queue */ |
| 1087 | case GADGETFS_DISCONNECT: |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1088 | if (dev->state == STATE_DEV_SETUP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | dev->setup_abort = 1; |
| 1090 | // FALL THROUGH |
| 1091 | case GADGETFS_CONNECT: |
| 1092 | dev->ev_next = 0; |
| 1093 | break; |
| 1094 | case GADGETFS_SETUP: /* previous request timed out */ |
| 1095 | case GADGETFS_SUSPEND: /* same effect */ |
| 1096 | /* these events can't be repeated */ |
| 1097 | for (i = 0; i != dev->ev_next; i++) { |
| 1098 | if (dev->event [i].type != type) |
| 1099 | continue; |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1100 | DBG(dev, "discard old event[%d] %d\n", i, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | dev->ev_next--; |
| 1102 | if (i == dev->ev_next) |
| 1103 | break; |
| 1104 | /* indices start at zero, for simplicity */ |
| 1105 | memmove (&dev->event [i], &dev->event [i + 1], |
| 1106 | sizeof (struct usb_gadgetfs_event) |
| 1107 | * (dev->ev_next - i)); |
| 1108 | } |
| 1109 | break; |
| 1110 | default: |
| 1111 | BUG (); |
| 1112 | } |
David Brownell | 0864c7a | 2007-01-16 22:53:58 -0800 | [diff] [blame] | 1113 | VDEBUG(dev, "event[%d] = %d\n", dev->ev_next, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | event = &dev->event [dev->ev_next++]; |
| 1115 | BUG_ON (dev->ev_next > N_EVENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | memset (event, 0, sizeof *event); |
| 1117 | event->type = type; |
| 1118 | return event; |
| 1119 | } |
| 1120 | |
| 1121 | static ssize_t |
| 1122 | ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 1123 | { |
| 1124 | struct dev_data *dev = fd->private_data; |
| 1125 | ssize_t retval = -ESRCH; |
| 1126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | /* report fd mode change before acting on it */ |
| 1128 | if (dev->setup_abort) { |
| 1129 | dev->setup_abort = 0; |
| 1130 | retval = -EIDRM; |
| 1131 | |
| 1132 | /* data and/or status stage for control request */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1133 | } else if (dev->state == STATE_DEV_SETUP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | |
Alan Stern | b946777 | 2016-12-09 15:17:46 -0500 | [diff] [blame] | 1135 | len = min_t(size_t, len, dev->setup_wLength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | if (dev->setup_in) { |
| 1137 | retval = setup_req (dev->gadget->ep0, dev->req, len); |
| 1138 | if (retval == 0) { |
David Brownell | 5b89db02 | 2007-01-16 22:56:26 -0800 | [diff] [blame] | 1139 | dev->state = STATE_DEV_CONNECTED; |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1140 | ++dev->udc_usage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | spin_unlock_irq (&dev->lock); |
| 1142 | if (copy_from_user (dev->req->buf, buf, len)) |
| 1143 | retval = -EFAULT; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 1144 | else { |
| 1145 | if (len < dev->setup_wLength) |
| 1146 | dev->req->zero = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | retval = usb_ep_queue ( |
| 1148 | dev->gadget->ep0, dev->req, |
| 1149 | GFP_KERNEL); |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 1150 | } |
David Eccher | b7bd98b | 2015-12-11 22:13:55 +0100 | [diff] [blame] | 1151 | spin_lock_irq(&dev->lock); |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1152 | --dev->udc_usage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | if (retval < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | clean_req (dev->gadget->ep0, dev->req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | } else |
| 1156 | retval = len; |
| 1157 | |
| 1158 | return retval; |
| 1159 | } |
| 1160 | |
| 1161 | /* can stall some OUT transfers */ |
| 1162 | } else if (dev->setup_can_stall) { |
| 1163 | VDEBUG(dev, "ep0out stall\n"); |
| 1164 | (void) usb_ep_set_halt (dev->gadget->ep0); |
| 1165 | retval = -EL2HLT; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1166 | dev->state = STATE_DEV_CONNECTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | } else { |
| 1168 | DBG(dev, "bogus ep0out stall!\n"); |
| 1169 | } |
| 1170 | } else |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1171 | DBG (dev, "fail %s, state %d\n", __func__, dev->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | return retval; |
| 1174 | } |
| 1175 | |
| 1176 | static int |
| 1177 | ep0_fasync (int f, struct file *fd, int on) |
| 1178 | { |
| 1179 | struct dev_data *dev = fd->private_data; |
| 1180 | // caller must F_SETOWN before signal delivery happens |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1181 | VDEBUG (dev, "%s %s\n", __func__, on ? "on" : "off"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | return fasync_helper (f, fd, on, &dev->fasync); |
| 1183 | } |
| 1184 | |
| 1185 | static struct usb_gadget_driver gadgetfs_driver; |
| 1186 | |
| 1187 | static int |
| 1188 | dev_release (struct inode *inode, struct file *fd) |
| 1189 | { |
| 1190 | struct dev_data *dev = fd->private_data; |
| 1191 | |
| 1192 | /* closing ep0 === shutdown all */ |
| 1193 | |
Alan Stern | 3ff5f4f | 2017-06-08 13:55:59 -0400 | [diff] [blame] | 1194 | if (dev->gadget_registered) { |
Marek Szyprowski | 7b0a271 | 2016-02-18 08:59:26 +0100 | [diff] [blame] | 1195 | usb_gadget_unregister_driver (&gadgetfs_driver); |
Alan Stern | 3ff5f4f | 2017-06-08 13:55:59 -0400 | [diff] [blame] | 1196 | dev->gadget_registered = false; |
| 1197 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | |
| 1199 | /* at this point "good" hardware has disconnected the |
| 1200 | * device from USB; the host won't see it any more. |
| 1201 | * alternatively, all host requests will time out. |
| 1202 | */ |
| 1203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | kfree (dev->buf); |
| 1205 | dev->buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | |
Marcus Nutzinger | f0cae93 | 2014-06-05 17:17:06 +0200 | [diff] [blame] | 1207 | /* other endpoints were all decoupled from this device */ |
| 1208 | spin_lock_irq(&dev->lock); |
| 1209 | dev->state = STATE_DEV_DISABLED; |
| 1210 | spin_unlock_irq(&dev->lock); |
| 1211 | |
| 1212 | put_dev (dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | return 0; |
| 1214 | } |
| 1215 | |
Milan Svoboda | e22fc27 | 2006-08-08 22:23:12 -0700 | [diff] [blame] | 1216 | static unsigned int |
| 1217 | ep0_poll (struct file *fd, poll_table *wait) |
| 1218 | { |
| 1219 | struct dev_data *dev = fd->private_data; |
| 1220 | int mask = 0; |
| 1221 | |
Alan Stern | 96b62a5 | 2015-03-04 10:31:50 -0500 | [diff] [blame] | 1222 | if (dev->state <= STATE_DEV_OPENED) |
| 1223 | return DEFAULT_POLLMASK; |
| 1224 | |
Milan Svoboda | e22fc27 | 2006-08-08 22:23:12 -0700 | [diff] [blame] | 1225 | poll_wait(fd, &dev->wait, wait); |
| 1226 | |
| 1227 | spin_lock_irq (&dev->lock); |
| 1228 | |
| 1229 | /* report fd mode change before acting on it */ |
| 1230 | if (dev->setup_abort) { |
| 1231 | dev->setup_abort = 0; |
| 1232 | mask = POLLHUP; |
| 1233 | goto out; |
| 1234 | } |
| 1235 | |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1236 | if (dev->state == STATE_DEV_SETUP) { |
Milan Svoboda | e22fc27 | 2006-08-08 22:23:12 -0700 | [diff] [blame] | 1237 | if (dev->setup_in || dev->setup_can_stall) |
| 1238 | mask = POLLOUT; |
| 1239 | } else { |
| 1240 | if (dev->ev_next != 0) |
| 1241 | mask = POLLIN; |
| 1242 | } |
| 1243 | out: |
| 1244 | spin_unlock_irq(&dev->lock); |
| 1245 | return mask; |
| 1246 | } |
| 1247 | |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 1248 | static long dev_ioctl (struct file *fd, unsigned code, unsigned long value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | { |
| 1250 | struct dev_data *dev = fd->private_data; |
| 1251 | struct usb_gadget *gadget = dev->gadget; |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 1252 | long ret = -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1254 | spin_lock_irq(&dev->lock); |
| 1255 | if (dev->state == STATE_DEV_OPENED || |
| 1256 | dev->state == STATE_DEV_UNBOUND) { |
| 1257 | /* Not bound to a UDC */ |
| 1258 | } else if (gadget->ops->ioctl) { |
| 1259 | ++dev->udc_usage; |
| 1260 | spin_unlock_irq(&dev->lock); |
| 1261 | |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 1262 | ret = gadget->ops->ioctl (gadget, code, value); |
Arnd Bergmann | 1548b13 | 2010-06-01 23:04:44 +0200 | [diff] [blame] | 1263 | |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1264 | spin_lock_irq(&dev->lock); |
| 1265 | --dev->udc_usage; |
| 1266 | } |
| 1267 | spin_unlock_irq(&dev->lock); |
| 1268 | |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 1269 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | } |
| 1271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | /*----------------------------------------------------------------------*/ |
| 1273 | |
| 1274 | /* The in-kernel gadget driver handles most ep0 issues, in particular |
| 1275 | * enumerating the single configuration (as provided from user space). |
| 1276 | * |
| 1277 | * Unrecognized ep0 requests may be handled in user space. |
| 1278 | */ |
| 1279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | static void make_qualifier (struct dev_data *dev) |
| 1281 | { |
| 1282 | struct usb_qualifier_descriptor qual; |
| 1283 | struct usb_device_descriptor *desc; |
| 1284 | |
| 1285 | qual.bLength = sizeof qual; |
| 1286 | qual.bDescriptorType = USB_DT_DEVICE_QUALIFIER; |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 1287 | qual.bcdUSB = cpu_to_le16 (0x0200); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | |
| 1289 | desc = dev->dev; |
| 1290 | qual.bDeviceClass = desc->bDeviceClass; |
| 1291 | qual.bDeviceSubClass = desc->bDeviceSubClass; |
| 1292 | qual.bDeviceProtocol = desc->bDeviceProtocol; |
| 1293 | |
| 1294 | /* assumes ep0 uses the same value for both speeds ... */ |
Sebastian Andrzej Siewior | 765f5b8 | 2011-06-23 14:26:11 +0200 | [diff] [blame] | 1295 | qual.bMaxPacketSize0 = dev->gadget->ep0->maxpacket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | |
| 1297 | qual.bNumConfigurations = 1; |
| 1298 | qual.bRESERVED = 0; |
| 1299 | |
| 1300 | memcpy (dev->rbuf, &qual, sizeof qual); |
| 1301 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | |
| 1303 | static int |
| 1304 | config_buf (struct dev_data *dev, u8 type, unsigned index) |
| 1305 | { |
| 1306 | int len; |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1307 | int hs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | |
| 1309 | /* only one configuration */ |
| 1310 | if (index > 0) |
| 1311 | return -EINVAL; |
| 1312 | |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1313 | if (gadget_is_dualspeed(dev->gadget)) { |
| 1314 | hs = (dev->gadget->speed == USB_SPEED_HIGH); |
| 1315 | if (type == USB_DT_OTHER_SPEED_CONFIG) |
| 1316 | hs = !hs; |
| 1317 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | if (hs) { |
| 1319 | dev->req->buf = dev->hs_config; |
David Brownell | 01ee7d7 | 2007-05-25 20:40:14 -0700 | [diff] [blame] | 1320 | len = le16_to_cpu(dev->hs_config->wTotalLength); |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1321 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | dev->req->buf = dev->config; |
David Brownell | 01ee7d7 | 2007-05-25 20:40:14 -0700 | [diff] [blame] | 1323 | len = le16_to_cpu(dev->config->wTotalLength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | } |
| 1325 | ((u8 *)dev->req->buf) [1] = type; |
| 1326 | return len; |
| 1327 | } |
| 1328 | |
| 1329 | static int |
| 1330 | gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) |
| 1331 | { |
| 1332 | struct dev_data *dev = get_gadget_data (gadget); |
| 1333 | struct usb_request *req = dev->req; |
| 1334 | int value = -EOPNOTSUPP; |
| 1335 | struct usb_gadgetfs_event *event; |
David Brownell | 1bbc169 | 2005-05-07 13:05:13 -0700 | [diff] [blame] | 1336 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 1337 | u16 w_length = le16_to_cpu(ctrl->wLength); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | |
| 1339 | spin_lock (&dev->lock); |
| 1340 | dev->setup_abort = 0; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1341 | if (dev->state == STATE_DEV_UNCONNECTED) { |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1342 | if (gadget_is_dualspeed(gadget) |
| 1343 | && gadget->speed == USB_SPEED_HIGH |
| 1344 | && dev->hs_config == NULL) { |
David Brownell | ce46794 | 2007-01-16 23:06:07 -0800 | [diff] [blame] | 1345 | spin_unlock(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | ERROR (dev, "no high speed config??\n"); |
| 1347 | return -EINVAL; |
| 1348 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | |
David Brownell | ce46794 | 2007-01-16 23:06:07 -0800 | [diff] [blame] | 1350 | dev->state = STATE_DEV_CONNECTED; |
David Brownell | ce46794 | 2007-01-16 23:06:07 -0800 | [diff] [blame] | 1351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | INFO (dev, "connected\n"); |
| 1353 | event = next_event (dev, GADGETFS_CONNECT); |
| 1354 | event->u.speed = gadget->speed; |
| 1355 | ep0_readable (dev); |
| 1356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | /* host may have given up waiting for response. we can miss control |
| 1358 | * requests handled lower down (device/endpoint status and features); |
| 1359 | * then ep0_{read,write} will report the wrong status. controller |
| 1360 | * driver will have aborted pending i/o. |
| 1361 | */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1362 | } else if (dev->state == STATE_DEV_SETUP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | dev->setup_abort = 1; |
| 1364 | |
| 1365 | req->buf = dev->rbuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | req->context = NULL; |
| 1367 | value = -EOPNOTSUPP; |
| 1368 | switch (ctrl->bRequest) { |
| 1369 | |
| 1370 | case USB_REQ_GET_DESCRIPTOR: |
| 1371 | if (ctrl->bRequestType != USB_DIR_IN) |
| 1372 | goto unrecognized; |
| 1373 | switch (w_value >> 8) { |
| 1374 | |
| 1375 | case USB_DT_DEVICE: |
| 1376 | value = min (w_length, (u16) sizeof *dev->dev); |
Sebastian Andrzej Siewior | 765f5b8 | 2011-06-23 14:26:11 +0200 | [diff] [blame] | 1377 | dev->dev->bMaxPacketSize0 = dev->gadget->ep0->maxpacket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | req->buf = dev->dev; |
| 1379 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | case USB_DT_DEVICE_QUALIFIER: |
| 1381 | if (!dev->hs_config) |
| 1382 | break; |
| 1383 | value = min (w_length, (u16) |
| 1384 | sizeof (struct usb_qualifier_descriptor)); |
| 1385 | make_qualifier (dev); |
| 1386 | break; |
| 1387 | case USB_DT_OTHER_SPEED_CONFIG: |
| 1388 | // FALLTHROUGH |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | case USB_DT_CONFIG: |
| 1390 | value = config_buf (dev, |
| 1391 | w_value >> 8, |
| 1392 | w_value & 0xff); |
| 1393 | if (value >= 0) |
| 1394 | value = min (w_length, (u16) value); |
| 1395 | break; |
| 1396 | case USB_DT_STRING: |
| 1397 | goto unrecognized; |
| 1398 | |
| 1399 | default: // all others are errors |
| 1400 | break; |
| 1401 | } |
| 1402 | break; |
| 1403 | |
| 1404 | /* currently one config, two speeds */ |
| 1405 | case USB_REQ_SET_CONFIGURATION: |
| 1406 | if (ctrl->bRequestType != 0) |
Roy Hashimoto | 12cd5b9 | 2008-03-12 13:55:31 -0800 | [diff] [blame] | 1407 | goto unrecognized; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | if (0 == (u8) w_value) { |
| 1409 | value = 0; |
| 1410 | dev->current_config = 0; |
| 1411 | usb_gadget_vbus_draw(gadget, 8 /* mA */ ); |
| 1412 | // user mode expected to disable endpoints |
| 1413 | } else { |
| 1414 | u8 config, power; |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1415 | |
| 1416 | if (gadget_is_dualspeed(gadget) |
| 1417 | && gadget->speed == USB_SPEED_HIGH) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | config = dev->hs_config->bConfigurationValue; |
| 1419 | power = dev->hs_config->bMaxPower; |
David Brownell | a4e3ef5 | 2007-08-01 23:58:22 -0700 | [diff] [blame] | 1420 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | config = dev->config->bConfigurationValue; |
| 1422 | power = dev->config->bMaxPower; |
| 1423 | } |
| 1424 | |
| 1425 | if (config == (u8) w_value) { |
| 1426 | value = 0; |
| 1427 | dev->current_config = config; |
| 1428 | usb_gadget_vbus_draw(gadget, 2 * power); |
| 1429 | } |
| 1430 | } |
| 1431 | |
| 1432 | /* report SET_CONFIGURATION like any other control request, |
| 1433 | * except that usermode may not stall this. the next |
| 1434 | * request mustn't be allowed start until this finishes: |
| 1435 | * endpoints and threads set up, etc. |
| 1436 | * |
| 1437 | * NOTE: older PXA hardware (before PXA 255: without UDCCFR) |
| 1438 | * has bad/racey automagic that prevents synchronizing here. |
| 1439 | * even kernel mode drivers often miss them. |
| 1440 | */ |
| 1441 | if (value == 0) { |
| 1442 | INFO (dev, "configuration #%d\n", dev->current_config); |
Peter Chen | 6027f31 | 2014-04-29 13:26:28 +0800 | [diff] [blame] | 1443 | usb_gadget_set_state(gadget, USB_STATE_CONFIGURED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | if (dev->usermode_setup) { |
| 1445 | dev->setup_can_stall = 0; |
| 1446 | goto delegate; |
| 1447 | } |
| 1448 | } |
| 1449 | break; |
| 1450 | |
Paul Bolle | d30f206 | 2014-05-26 23:37:09 +0200 | [diff] [blame] | 1451 | #ifndef CONFIG_USB_PXA25X |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | /* PXA automagically handles this request too */ |
| 1453 | case USB_REQ_GET_CONFIGURATION: |
| 1454 | if (ctrl->bRequestType != 0x80) |
Roy Hashimoto | 12cd5b9 | 2008-03-12 13:55:31 -0800 | [diff] [blame] | 1455 | goto unrecognized; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | *(u8 *)req->buf = dev->current_config; |
| 1457 | value = min (w_length, (u16) 1); |
| 1458 | break; |
| 1459 | #endif |
| 1460 | |
| 1461 | default: |
| 1462 | unrecognized: |
| 1463 | VDEBUG (dev, "%s req%02x.%02x v%04x i%04x l%d\n", |
| 1464 | dev->usermode_setup ? "delegate" : "fail", |
| 1465 | ctrl->bRequestType, ctrl->bRequest, |
| 1466 | w_value, le16_to_cpu(ctrl->wIndex), w_length); |
| 1467 | |
| 1468 | /* if there's an ep0 reader, don't stall */ |
| 1469 | if (dev->usermode_setup) { |
| 1470 | dev->setup_can_stall = 1; |
| 1471 | delegate: |
| 1472 | dev->setup_in = (ctrl->bRequestType & USB_DIR_IN) |
| 1473 | ? 1 : 0; |
Alan Stern | 9790636 | 2006-01-03 10:30:31 -0500 | [diff] [blame] | 1474 | dev->setup_wLength = w_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | dev->setup_out_ready = 0; |
| 1476 | dev->setup_out_error = 0; |
| 1477 | value = 0; |
| 1478 | |
| 1479 | /* read DATA stage for OUT right away */ |
| 1480 | if (unlikely (!dev->setup_in && w_length)) { |
| 1481 | value = setup_req (gadget->ep0, dev->req, |
| 1482 | w_length); |
| 1483 | if (value < 0) |
| 1484 | break; |
Bin Liu | d246dcb | 2016-05-26 11:43:45 -0500 | [diff] [blame] | 1485 | |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1486 | ++dev->udc_usage; |
Bin Liu | d246dcb | 2016-05-26 11:43:45 -0500 | [diff] [blame] | 1487 | spin_unlock (&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | value = usb_ep_queue (gadget->ep0, dev->req, |
Bin Liu | d246dcb | 2016-05-26 11:43:45 -0500 | [diff] [blame] | 1489 | GFP_KERNEL); |
| 1490 | spin_lock (&dev->lock); |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1491 | --dev->udc_usage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | if (value < 0) { |
| 1493 | clean_req (gadget->ep0, dev->req); |
| 1494 | break; |
| 1495 | } |
| 1496 | |
| 1497 | /* we can't currently stall these */ |
| 1498 | dev->setup_can_stall = 0; |
| 1499 | } |
| 1500 | |
| 1501 | /* state changes when reader collects event */ |
| 1502 | event = next_event (dev, GADGETFS_SETUP); |
| 1503 | event->u.setup = *ctrl; |
| 1504 | ep0_readable (dev); |
| 1505 | spin_unlock (&dev->lock); |
| 1506 | return 0; |
| 1507 | } |
| 1508 | } |
| 1509 | |
| 1510 | /* proceed with data transfer and status phases? */ |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1511 | if (value >= 0 && dev->state != STATE_DEV_SETUP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | req->length = value; |
| 1513 | req->zero = value < w_length; |
Bin Liu | d246dcb | 2016-05-26 11:43:45 -0500 | [diff] [blame] | 1514 | |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1515 | ++dev->udc_usage; |
Bin Liu | d246dcb | 2016-05-26 11:43:45 -0500 | [diff] [blame] | 1516 | spin_unlock (&dev->lock); |
| 1517 | value = usb_ep_queue (gadget->ep0, req, GFP_KERNEL); |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1518 | spin_lock(&dev->lock); |
| 1519 | --dev->udc_usage; |
| 1520 | spin_unlock(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | if (value < 0) { |
| 1522 | DBG (dev, "ep_queue --> %d\n", value); |
| 1523 | req->status = 0; |
| 1524 | } |
Bin Liu | d246dcb | 2016-05-26 11:43:45 -0500 | [diff] [blame] | 1525 | return value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | } |
| 1527 | |
| 1528 | /* device stalls when value < 0 */ |
| 1529 | spin_unlock (&dev->lock); |
| 1530 | return value; |
| 1531 | } |
| 1532 | |
| 1533 | static void destroy_ep_files (struct dev_data *dev) |
| 1534 | { |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1535 | DBG (dev, "%s %d\n", __func__, dev->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | |
| 1537 | /* dev->state must prevent interference */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | spin_lock_irq (&dev->lock); |
Al Viro | 104bb37 | 2012-01-08 16:13:28 -0500 | [diff] [blame] | 1539 | while (!list_empty(&dev->epfiles)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | struct ep_data *ep; |
| 1541 | struct inode *parent; |
| 1542 | struct dentry *dentry; |
| 1543 | |
| 1544 | /* break link to FS */ |
Al Viro | 104bb37 | 2012-01-08 16:13:28 -0500 | [diff] [blame] | 1545 | ep = list_first_entry (&dev->epfiles, struct ep_data, epfiles); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | list_del_init (&ep->epfiles); |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1547 | spin_unlock_irq (&dev->lock); |
| 1548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | dentry = ep->dentry; |
| 1550 | ep->dentry = NULL; |
David Howells | 75c3cfa | 2015-03-17 22:26:12 +0000 | [diff] [blame] | 1551 | parent = d_inode(dentry->d_parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | |
| 1553 | /* break link to controller */ |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1554 | mutex_lock(&ep->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | if (ep->state == STATE_EP_ENABLED) |
| 1556 | (void) usb_ep_disable (ep->ep); |
| 1557 | ep->state = STATE_EP_UNBOUND; |
| 1558 | usb_ep_free_request (ep->ep, ep->req); |
| 1559 | ep->ep = NULL; |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1560 | mutex_unlock(&ep->lock); |
| 1561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | wake_up (&ep->wait); |
| 1563 | put_ep (ep); |
| 1564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | /* break link to dcache */ |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 1566 | inode_lock(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | d_delete (dentry); |
| 1568 | dput (dentry); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 1569 | inode_unlock(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | |
Al Viro | 104bb37 | 2012-01-08 16:13:28 -0500 | [diff] [blame] | 1571 | spin_lock_irq (&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | } |
| 1573 | spin_unlock_irq (&dev->lock); |
| 1574 | } |
| 1575 | |
| 1576 | |
Al Viro | fb6c322 | 2014-09-03 13:37:56 -0400 | [diff] [blame] | 1577 | static struct dentry * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | gadgetfs_create_file (struct super_block *sb, char const *name, |
Al Viro | fb6c322 | 2014-09-03 13:37:56 -0400 | [diff] [blame] | 1579 | void *data, const struct file_operations *fops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | |
| 1581 | static int activate_ep_files (struct dev_data *dev) |
| 1582 | { |
| 1583 | struct usb_ep *ep; |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1584 | struct ep_data *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | |
| 1586 | gadget_for_each_ep (ep, dev->gadget) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | |
Eric Sesterhenn | 7039f42 | 2006-02-27 13:34:10 -0800 | [diff] [blame] | 1588 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | if (!data) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1590 | goto enomem0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | data->state = STATE_EP_DISABLED; |
Thomas Gleixner | a79df50 | 2010-01-29 20:38:59 +0000 | [diff] [blame] | 1592 | mutex_init(&data->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | init_waitqueue_head (&data->wait); |
| 1594 | |
| 1595 | strncpy (data->name, ep->name, sizeof (data->name) - 1); |
| 1596 | atomic_set (&data->count, 1); |
| 1597 | data->dev = dev; |
| 1598 | get_dev (dev); |
| 1599 | |
| 1600 | data->ep = ep; |
| 1601 | ep->driver_data = data; |
| 1602 | |
| 1603 | data->req = usb_ep_alloc_request (ep, GFP_KERNEL); |
| 1604 | if (!data->req) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1605 | goto enomem1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | |
Al Viro | fb6c322 | 2014-09-03 13:37:56 -0400 | [diff] [blame] | 1607 | data->dentry = gadgetfs_create_file (dev->sb, data->name, |
Al Viro | d4461a6 | 2015-03-03 08:39:34 +0000 | [diff] [blame] | 1608 | data, &ep_io_operations); |
Al Viro | fb6c322 | 2014-09-03 13:37:56 -0400 | [diff] [blame] | 1609 | if (!data->dentry) |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1610 | goto enomem2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | list_add_tail (&data->epfiles, &dev->epfiles); |
| 1612 | } |
| 1613 | return 0; |
| 1614 | |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 1615 | enomem2: |
| 1616 | usb_ep_free_request (ep, data->req); |
| 1617 | enomem1: |
| 1618 | put_dev (dev); |
| 1619 | kfree (data); |
| 1620 | enomem0: |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1621 | DBG (dev, "%s enomem\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | destroy_ep_files (dev); |
| 1623 | return -ENOMEM; |
| 1624 | } |
| 1625 | |
| 1626 | static void |
| 1627 | gadgetfs_unbind (struct usb_gadget *gadget) |
| 1628 | { |
| 1629 | struct dev_data *dev = get_gadget_data (gadget); |
| 1630 | |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1631 | DBG (dev, "%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | |
| 1633 | spin_lock_irq (&dev->lock); |
| 1634 | dev->state = STATE_DEV_UNBOUND; |
Alan Stern | fd5336c | 2017-09-21 13:23:58 -0400 | [diff] [blame] | 1635 | while (dev->udc_usage > 0) { |
| 1636 | spin_unlock_irq(&dev->lock); |
| 1637 | usleep_range(1000, 2000); |
| 1638 | spin_lock_irq(&dev->lock); |
| 1639 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | spin_unlock_irq (&dev->lock); |
| 1641 | |
| 1642 | destroy_ep_files (dev); |
| 1643 | gadget->ep0->driver_data = NULL; |
| 1644 | set_gadget_data (gadget, NULL); |
| 1645 | |
| 1646 | /* we've already been disconnected ... no i/o is active */ |
| 1647 | if (dev->req) |
| 1648 | usb_ep_free_request (gadget->ep0, dev->req); |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1649 | DBG (dev, "%s done\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | put_dev (dev); |
| 1651 | } |
| 1652 | |
| 1653 | static struct dev_data *the_device; |
| 1654 | |
Sebastian Andrzej Siewior | ffe0b33 | 2012-09-07 09:53:17 +0200 | [diff] [blame] | 1655 | static int gadgetfs_bind(struct usb_gadget *gadget, |
| 1656 | struct usb_gadget_driver *driver) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | { |
| 1658 | struct dev_data *dev = the_device; |
| 1659 | |
| 1660 | if (!dev) |
| 1661 | return -ESRCH; |
| 1662 | if (0 != strcmp (CHIP, gadget->name)) { |
David Brownell | 0027492 | 2007-11-19 12:58:36 -0800 | [diff] [blame] | 1663 | pr_err("%s expected %s controller not %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | shortname, CHIP, gadget->name); |
| 1665 | return -ENODEV; |
| 1666 | } |
| 1667 | |
| 1668 | set_gadget_data (gadget, dev); |
| 1669 | dev->gadget = gadget; |
| 1670 | gadget->ep0->driver_data = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | |
| 1672 | /* preallocate control response and buffer */ |
| 1673 | dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL); |
| 1674 | if (!dev->req) |
| 1675 | goto enomem; |
| 1676 | dev->req->context = NULL; |
| 1677 | dev->req->complete = epio_complete; |
| 1678 | |
| 1679 | if (activate_ep_files (dev) < 0) |
| 1680 | goto enomem; |
| 1681 | |
| 1682 | INFO (dev, "bound to %s driver\n", gadget->name); |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1683 | spin_lock_irq(&dev->lock); |
| 1684 | dev->state = STATE_DEV_UNCONNECTED; |
| 1685 | spin_unlock_irq(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | get_dev (dev); |
| 1687 | return 0; |
| 1688 | |
| 1689 | enomem: |
| 1690 | gadgetfs_unbind (gadget); |
| 1691 | return -ENOMEM; |
| 1692 | } |
| 1693 | |
| 1694 | static void |
| 1695 | gadgetfs_disconnect (struct usb_gadget *gadget) |
| 1696 | { |
| 1697 | struct dev_data *dev = get_gadget_data (gadget); |
Marc Kleine-Budde | 001428e | 2011-10-10 18:38:05 +0200 | [diff] [blame] | 1698 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | |
Marc Kleine-Budde | 001428e | 2011-10-10 18:38:05 +0200 | [diff] [blame] | 1700 | spin_lock_irqsave (&dev->lock, flags); |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1701 | if (dev->state == STATE_DEV_UNCONNECTED) |
Milan Svoboda | 07cb7f2 | 2006-06-26 07:46:00 -0700 | [diff] [blame] | 1702 | goto exit; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1703 | dev->state = STATE_DEV_UNCONNECTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | |
| 1705 | INFO (dev, "disconnected\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | next_event (dev, GADGETFS_DISCONNECT); |
| 1707 | ep0_readable (dev); |
Milan Svoboda | 07cb7f2 | 2006-06-26 07:46:00 -0700 | [diff] [blame] | 1708 | exit: |
Marc Kleine-Budde | 001428e | 2011-10-10 18:38:05 +0200 | [diff] [blame] | 1709 | spin_unlock_irqrestore (&dev->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | } |
| 1711 | |
| 1712 | static void |
| 1713 | gadgetfs_suspend (struct usb_gadget *gadget) |
| 1714 | { |
| 1715 | struct dev_data *dev = get_gadget_data (gadget); |
Alan Stern | 0c0d3d8 | 2017-06-13 15:23:42 -0400 | [diff] [blame] | 1716 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | |
| 1718 | INFO (dev, "suspended from state %d\n", dev->state); |
Alan Stern | 0c0d3d8 | 2017-06-13 15:23:42 -0400 | [diff] [blame] | 1719 | spin_lock_irqsave(&dev->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | switch (dev->state) { |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1721 | case STATE_DEV_SETUP: // VERY odd... host died?? |
| 1722 | case STATE_DEV_CONNECTED: |
| 1723 | case STATE_DEV_UNCONNECTED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | next_event (dev, GADGETFS_SUSPEND); |
| 1725 | ep0_readable (dev); |
| 1726 | /* FALLTHROUGH */ |
| 1727 | default: |
| 1728 | break; |
| 1729 | } |
Alan Stern | 0c0d3d8 | 2017-06-13 15:23:42 -0400 | [diff] [blame] | 1730 | spin_unlock_irqrestore(&dev->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | } |
| 1732 | |
| 1733 | static struct usb_gadget_driver gadgetfs_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | .function = (char *) driver_desc, |
Sebastian Andrzej Siewior | 9395295 | 2012-09-06 20:11:05 +0200 | [diff] [blame] | 1735 | .bind = gadgetfs_bind, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | .unbind = gadgetfs_unbind, |
| 1737 | .setup = gadgetfs_setup, |
Peter Chen | 0eba455 | 2014-09-09 08:56:51 +0800 | [diff] [blame] | 1738 | .reset = gadgetfs_disconnect, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | .disconnect = gadgetfs_disconnect, |
| 1740 | .suspend = gadgetfs_suspend, |
| 1741 | |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 1742 | .driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | .name = (char *) shortname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | }, |
| 1745 | }; |
| 1746 | |
| 1747 | /*----------------------------------------------------------------------*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | /* DEVICE INITIALIZATION |
| 1749 | * |
| 1750 | * fd = open ("/dev/gadget/$CHIP", O_RDWR) |
| 1751 | * status = write (fd, descriptors, sizeof descriptors) |
| 1752 | * |
| 1753 | * That write establishes the device configuration, so the kernel can |
| 1754 | * bind to the controller ... guaranteeing it can handle enumeration |
| 1755 | * at all necessary speeds. Descriptor order is: |
| 1756 | * |
| 1757 | * . message tag (u32, host order) ... for now, must be zero; it |
| 1758 | * would change to support features like multi-config devices |
| 1759 | * . full/low speed config ... all wTotalLength bytes (with interface, |
| 1760 | * class, altsetting, endpoint, and other descriptors) |
| 1761 | * . high speed config ... all descriptors, for high speed operation; |
David Brownell | 2505107 | 2007-01-15 11:30:28 -0800 | [diff] [blame] | 1762 | * this one's optional except for high-speed hardware |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | * . device descriptor |
| 1764 | * |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 1765 | * Endpoints are not yet enabled. Drivers must wait until device |
| 1766 | * configuration and interface altsetting changes create |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | * the need to configure (or unconfigure) them. |
| 1768 | * |
| 1769 | * After initialization, the device stays active for as long as that |
Phil Endecott | 511779f | 2007-01-15 11:35:01 -0800 | [diff] [blame] | 1770 | * $CHIP file is open. Events must then be read from that descriptor, |
| 1771 | * such as configuration notifications. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | */ |
| 1773 | |
Alan Stern | da4543b | 2016-12-09 15:24:24 -0500 | [diff] [blame] | 1774 | static int is_valid_config(struct usb_config_descriptor *config, |
| 1775 | unsigned int total) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | { |
| 1777 | return config->bDescriptorType == USB_DT_CONFIG |
| 1778 | && config->bLength == USB_DT_CONFIG_SIZE |
Alan Stern | da4543b | 2016-12-09 15:24:24 -0500 | [diff] [blame] | 1779 | && total >= USB_DT_CONFIG_SIZE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | && config->bConfigurationValue != 0 |
| 1781 | && (config->bmAttributes & USB_CONFIG_ATT_ONE) != 0 |
| 1782 | && (config->bmAttributes & USB_CONFIG_ATT_WAKEUP) == 0; |
| 1783 | /* FIXME if gadget->is_otg, _must_ include an otg descriptor */ |
| 1784 | /* FIXME check lengths: walk to end */ |
| 1785 | } |
| 1786 | |
| 1787 | static ssize_t |
| 1788 | dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 1789 | { |
| 1790 | struct dev_data *dev = fd->private_data; |
| 1791 | ssize_t value = len, length = len; |
| 1792 | unsigned total; |
| 1793 | u32 tag; |
| 1794 | char *kbuf; |
| 1795 | |
Alan Stern | 96b62a5 | 2015-03-04 10:31:50 -0500 | [diff] [blame] | 1796 | spin_lock_irq(&dev->lock); |
| 1797 | if (dev->state > STATE_DEV_OPENED) { |
| 1798 | value = ep0_write(fd, buf, len, ptr); |
| 1799 | spin_unlock_irq(&dev->lock); |
| 1800 | return value; |
| 1801 | } |
| 1802 | spin_unlock_irq(&dev->lock); |
| 1803 | |
Greg Kroah-Hartman | 404954e | 2016-12-06 08:36:29 +0100 | [diff] [blame] | 1804 | if ((len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4)) || |
| 1805 | (len > PAGE_SIZE * 4)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | return -EINVAL; |
| 1807 | |
| 1808 | /* we might need to change message format someday */ |
| 1809 | if (copy_from_user (&tag, buf, 4)) |
| 1810 | return -EFAULT; |
| 1811 | if (tag != 0) |
| 1812 | return -EINVAL; |
| 1813 | buf += 4; |
| 1814 | length -= 4; |
| 1815 | |
Julia Lawall | be8a058 | 2010-05-22 10:26:22 +0200 | [diff] [blame] | 1816 | kbuf = memdup_user(buf, length); |
| 1817 | if (IS_ERR(kbuf)) |
| 1818 | return PTR_ERR(kbuf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | |
| 1820 | spin_lock_irq (&dev->lock); |
| 1821 | value = -EINVAL; |
Christophe JAILLET | 8fe9ea8 | 2017-02-21 22:33:11 +0100 | [diff] [blame] | 1822 | if (dev->buf) { |
| 1823 | kfree(kbuf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | goto fail; |
Christophe JAILLET | 8fe9ea8 | 2017-02-21 22:33:11 +0100 | [diff] [blame] | 1825 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | dev->buf = kbuf; |
| 1827 | |
| 1828 | /* full or low speed config */ |
| 1829 | dev->config = (void *) kbuf; |
David Brownell | 01ee7d7 | 2007-05-25 20:40:14 -0700 | [diff] [blame] | 1830 | total = le16_to_cpu(dev->config->wTotalLength); |
Alan Stern | da4543b | 2016-12-09 15:24:24 -0500 | [diff] [blame] | 1831 | if (!is_valid_config(dev->config, total) || |
| 1832 | total > length - USB_DT_DEVICE_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | goto fail; |
| 1834 | kbuf += total; |
| 1835 | length -= total; |
| 1836 | |
| 1837 | /* optional high speed config */ |
| 1838 | if (kbuf [1] == USB_DT_CONFIG) { |
| 1839 | dev->hs_config = (void *) kbuf; |
David Brownell | 01ee7d7 | 2007-05-25 20:40:14 -0700 | [diff] [blame] | 1840 | total = le16_to_cpu(dev->hs_config->wTotalLength); |
Alan Stern | da4543b | 2016-12-09 15:24:24 -0500 | [diff] [blame] | 1841 | if (!is_valid_config(dev->hs_config, total) || |
| 1842 | total > length - USB_DT_DEVICE_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | goto fail; |
| 1844 | kbuf += total; |
| 1845 | length -= total; |
Alan Stern | 46427c2 | 2016-12-09 15:18:43 -0500 | [diff] [blame] | 1846 | } else { |
| 1847 | dev->hs_config = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1848 | } |
| 1849 | |
| 1850 | /* could support multiple configs, using another encoding! */ |
| 1851 | |
| 1852 | /* device descriptor (tweaked for paranoia) */ |
| 1853 | if (length != USB_DT_DEVICE_SIZE) |
| 1854 | goto fail; |
| 1855 | dev->dev = (void *)kbuf; |
| 1856 | if (dev->dev->bLength != USB_DT_DEVICE_SIZE |
| 1857 | || dev->dev->bDescriptorType != USB_DT_DEVICE |
| 1858 | || dev->dev->bNumConfigurations != 1) |
| 1859 | goto fail; |
| 1860 | dev->dev->bNumConfigurations = 1; |
Harvey Harrison | 551509d | 2009-02-11 14:11:36 -0800 | [diff] [blame] | 1861 | dev->dev->bcdUSB = cpu_to_le16 (0x0200); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | |
| 1863 | /* triggers gadgetfs_bind(); then we can enumerate. */ |
| 1864 | spin_unlock_irq (&dev->lock); |
Michal Nazarewicz | 85b8614 | 2012-08-24 20:46:18 +0200 | [diff] [blame] | 1865 | if (dev->hs_config) |
| 1866 | gadgetfs_driver.max_speed = USB_SPEED_HIGH; |
| 1867 | else |
| 1868 | gadgetfs_driver.max_speed = USB_SPEED_FULL; |
Sebastian Andrzej Siewior | 9395295 | 2012-09-06 20:11:05 +0200 | [diff] [blame] | 1869 | |
| 1870 | value = usb_gadget_probe_driver(&gadgetfs_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1871 | if (value != 0) { |
| 1872 | kfree (dev->buf); |
| 1873 | dev->buf = NULL; |
| 1874 | } else { |
| 1875 | /* at this point "good" hardware has for the first time |
| 1876 | * let the USB the host see us. alternatively, if users |
| 1877 | * unplug/replug that will clear all the error state. |
| 1878 | * |
| 1879 | * note: everything running before here was guaranteed |
| 1880 | * to choke driver model style diagnostics. from here |
| 1881 | * on, they can work ... except in cleanup paths that |
| 1882 | * kick in after the ep0 descriptor is closed. |
| 1883 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | value = len; |
Marek Szyprowski | 7b0a271 | 2016-02-18 08:59:26 +0100 | [diff] [blame] | 1885 | dev->gadget_registered = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | } |
| 1887 | return value; |
| 1888 | |
| 1889 | fail: |
| 1890 | spin_unlock_irq (&dev->lock); |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1891 | pr_debug ("%s: %s fail %Zd, %p\n", shortname, __func__, value, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | kfree (dev->buf); |
| 1893 | dev->buf = NULL; |
| 1894 | return value; |
| 1895 | } |
| 1896 | |
| 1897 | static int |
| 1898 | dev_open (struct inode *inode, struct file *fd) |
| 1899 | { |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 1900 | struct dev_data *dev = inode->i_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | int value = -EBUSY; |
| 1902 | |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1903 | spin_lock_irq(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | if (dev->state == STATE_DEV_DISABLED) { |
| 1905 | dev->ev_next = 0; |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1906 | dev->state = STATE_DEV_OPENED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | fd->private_data = dev; |
| 1908 | get_dev (dev); |
| 1909 | value = 0; |
| 1910 | } |
David Brownell | 7489d14 | 2007-01-16 22:51:04 -0800 | [diff] [blame] | 1911 | spin_unlock_irq(&dev->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | return value; |
| 1913 | } |
| 1914 | |
Alan Stern | 96b62a5 | 2015-03-04 10:31:50 -0500 | [diff] [blame] | 1915 | static const struct file_operations ep0_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | .llseek = no_llseek, |
| 1917 | |
| 1918 | .open = dev_open, |
Alan Stern | 96b62a5 | 2015-03-04 10:31:50 -0500 | [diff] [blame] | 1919 | .read = ep0_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | .write = dev_config, |
| 1921 | .fasync = ep0_fasync, |
Alan Stern | 96b62a5 | 2015-03-04 10:31:50 -0500 | [diff] [blame] | 1922 | .poll = ep0_poll, |
Alan Cox | 44c389a | 2008-05-22 22:03:27 +0100 | [diff] [blame] | 1923 | .unlocked_ioctl = dev_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | .release = dev_release, |
| 1925 | }; |
| 1926 | |
| 1927 | /*----------------------------------------------------------------------*/ |
| 1928 | |
| 1929 | /* FILESYSTEM AND SUPERBLOCK OPERATIONS |
| 1930 | * |
| 1931 | * Mounting the filesystem creates a controller file, used first for |
| 1932 | * device configuration then later for event monitoring. |
| 1933 | */ |
| 1934 | |
| 1935 | |
| 1936 | /* FIXME PAM etc could set this security policy without mount options |
| 1937 | * if epfiles inherited ownership and permissons from ep0 ... |
| 1938 | */ |
| 1939 | |
| 1940 | static unsigned default_uid; |
| 1941 | static unsigned default_gid; |
| 1942 | static unsigned default_perm = S_IRUSR | S_IWUSR; |
| 1943 | |
| 1944 | module_param (default_uid, uint, 0644); |
| 1945 | module_param (default_gid, uint, 0644); |
| 1946 | module_param (default_perm, uint, 0644); |
| 1947 | |
| 1948 | |
| 1949 | static struct inode * |
| 1950 | gadgetfs_make_inode (struct super_block *sb, |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 1951 | void *data, const struct file_operations *fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | int mode) |
| 1953 | { |
| 1954 | struct inode *inode = new_inode (sb); |
| 1955 | |
| 1956 | if (inode) { |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 1957 | inode->i_ino = get_next_ino(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | inode->i_mode = mode; |
Eric W. Biederman | 32d639c | 2012-02-07 16:32:04 -0800 | [diff] [blame] | 1959 | inode->i_uid = make_kuid(&init_user_ns, default_uid); |
| 1960 | inode->i_gid = make_kgid(&init_user_ns, default_gid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | inode->i_atime = inode->i_mtime = inode->i_ctime |
Deepa Dinamani | 078cd82 | 2016-09-14 07:48:04 -0700 | [diff] [blame] | 1962 | = current_time(inode); |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 1963 | inode->i_private = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | inode->i_fop = fops; |
| 1965 | } |
| 1966 | return inode; |
| 1967 | } |
| 1968 | |
| 1969 | /* creates in fs root directory, so non-renamable and non-linkable. |
| 1970 | * so inode and dentry are paired, until device reconfig. |
| 1971 | */ |
Al Viro | fb6c322 | 2014-09-03 13:37:56 -0400 | [diff] [blame] | 1972 | static struct dentry * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | gadgetfs_create_file (struct super_block *sb, char const *name, |
Al Viro | fb6c322 | 2014-09-03 13:37:56 -0400 | [diff] [blame] | 1974 | void *data, const struct file_operations *fops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | { |
| 1976 | struct dentry *dentry; |
| 1977 | struct inode *inode; |
| 1978 | |
| 1979 | dentry = d_alloc_name(sb->s_root, name); |
| 1980 | if (!dentry) |
| 1981 | return NULL; |
| 1982 | |
| 1983 | inode = gadgetfs_make_inode (sb, data, fops, |
| 1984 | S_IFREG | (default_perm & S_IRWXUGO)); |
| 1985 | if (!inode) { |
| 1986 | dput(dentry); |
| 1987 | return NULL; |
| 1988 | } |
| 1989 | d_add (dentry, inode); |
Al Viro | fb6c322 | 2014-09-03 13:37:56 -0400 | [diff] [blame] | 1990 | return dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | } |
| 1992 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1993 | static const struct super_operations gadget_fs_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | .statfs = simple_statfs, |
| 1995 | .drop_inode = generic_delete_inode, |
| 1996 | }; |
| 1997 | |
| 1998 | static int |
| 1999 | gadgetfs_fill_super (struct super_block *sb, void *opts, int silent) |
| 2000 | { |
| 2001 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | struct dev_data *dev; |
| 2003 | |
| 2004 | if (the_device) |
| 2005 | return -ESRCH; |
| 2006 | |
Marek Szyprowski | 175f712 | 2016-02-18 11:34:43 +0100 | [diff] [blame] | 2007 | CHIP = usb_get_gadget_udc_name(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | if (!CHIP) |
| 2009 | return -ENODEV; |
| 2010 | |
| 2011 | /* superblock */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2012 | sb->s_blocksize = PAGE_SIZE; |
| 2013 | sb->s_blocksize_bits = PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | sb->s_magic = GADGETFS_MAGIC; |
| 2015 | sb->s_op = &gadget_fs_operations; |
| 2016 | sb->s_time_gran = 1; |
| 2017 | |
| 2018 | /* root inode */ |
| 2019 | inode = gadgetfs_make_inode (sb, |
| 2020 | NULL, &simple_dir_operations, |
| 2021 | S_IFDIR | S_IRUGO | S_IXUGO); |
| 2022 | if (!inode) |
Al Viro | 87da5b3 | 2012-01-08 15:59:45 -0500 | [diff] [blame] | 2023 | goto Enomem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | inode->i_op = &simple_dir_inode_operations; |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 2025 | if (!(sb->s_root = d_make_root (inode))) |
Al Viro | 87da5b3 | 2012-01-08 15:59:45 -0500 | [diff] [blame] | 2026 | goto Enomem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | |
| 2028 | /* the ep0 file is named after the controller we expect; |
| 2029 | * user mode code can use it for sanity checks, like we do. |
| 2030 | */ |
| 2031 | dev = dev_new (); |
| 2032 | if (!dev) |
Al Viro | 87da5b3 | 2012-01-08 15:59:45 -0500 | [diff] [blame] | 2033 | goto Enomem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | |
| 2035 | dev->sb = sb; |
Alan Stern | 96b62a5 | 2015-03-04 10:31:50 -0500 | [diff] [blame] | 2036 | dev->dentry = gadgetfs_create_file(sb, CHIP, dev, &ep0_operations); |
Al Viro | fb6c322 | 2014-09-03 13:37:56 -0400 | [diff] [blame] | 2037 | if (!dev->dentry) { |
Al Viro | 87da5b3 | 2012-01-08 15:59:45 -0500 | [diff] [blame] | 2038 | put_dev(dev); |
| 2039 | goto Enomem; |
| 2040 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | |
| 2042 | /* other endpoint files are available after hardware setup, |
| 2043 | * from binding to a controller. |
| 2044 | */ |
| 2045 | the_device = dev; |
| 2046 | return 0; |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2047 | |
Al Viro | 87da5b3 | 2012-01-08 15:59:45 -0500 | [diff] [blame] | 2048 | Enomem: |
Alan Stern | 0ae4ea8 | 2006-05-22 12:27:38 -0400 | [diff] [blame] | 2049 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | } |
| 2051 | |
| 2052 | /* "mount -t gadgetfs path /dev/gadget" ends up here */ |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 2053 | static struct dentry * |
| 2054 | gadgetfs_mount (struct file_system_type *t, int flags, |
| 2055 | const char *path, void *opts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | { |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 2057 | return mount_single (t, flags, opts, gadgetfs_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | } |
| 2059 | |
| 2060 | static void |
| 2061 | gadgetfs_kill_sb (struct super_block *sb) |
| 2062 | { |
| 2063 | kill_litter_super (sb); |
| 2064 | if (the_device) { |
| 2065 | put_dev (the_device); |
| 2066 | the_device = NULL; |
| 2067 | } |
Marek Szyprowski | 175f712 | 2016-02-18 11:34:43 +0100 | [diff] [blame] | 2068 | kfree(CHIP); |
| 2069 | CHIP = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | } |
| 2071 | |
| 2072 | /*----------------------------------------------------------------------*/ |
| 2073 | |
| 2074 | static struct file_system_type gadgetfs_type = { |
| 2075 | .owner = THIS_MODULE, |
| 2076 | .name = shortname, |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 2077 | .mount = gadgetfs_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | .kill_sb = gadgetfs_kill_sb, |
| 2079 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 2080 | MODULE_ALIAS_FS("gadgetfs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | |
| 2082 | /*----------------------------------------------------------------------*/ |
| 2083 | |
| 2084 | static int __init init (void) |
| 2085 | { |
| 2086 | int status; |
| 2087 | |
| 2088 | status = register_filesystem (&gadgetfs_type); |
| 2089 | if (status == 0) |
| 2090 | pr_info ("%s: %s, version " DRIVER_VERSION "\n", |
| 2091 | shortname, driver_desc); |
| 2092 | return status; |
| 2093 | } |
| 2094 | module_init (init); |
| 2095 | |
| 2096 | static void __exit cleanup (void) |
| 2097 | { |
| 2098 | pr_debug ("unregister %s\n", shortname); |
| 2099 | unregister_filesystem (&gadgetfs_type); |
| 2100 | } |
| 2101 | module_exit (cleanup); |
| 2102 | |