drivers/usb/gadget/legacy/printer.c

   1 /*
   2  * printer.c -- Printer gadget driver
   3  *
   4  * Copyright (C) 2003-2005 David Brownell
   5  * Copyright (C) 2006 Craig W. Nadler
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/delay.h>
  16 #include <linux/ioport.h>
  17 #include <linux/sched.h>
  18 #include <linux/slab.h>
  19 #include <linux/mutex.h>
  20 #include <linux/errno.h>
  21 #include <linux/init.h>
  22 #include <linux/timer.h>
  23 #include <linux/list.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/device.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/fs.h>
  28 #include <linux/poll.h>
  29 #include <linux/types.h>
  30 #include <linux/ctype.h>
  31 #include <linux/cdev.h>
  32
  33 #include <asm/byteorder.h>
  34 #include <linux/io.h>
  35 #include <linux/irq.h>
  36 #include <linux/uaccess.h>
  37 #include <asm/unaligned.h>
  38
  39 #include <linux/usb/ch9.h>
  40 #include <linux/usb/composite.h>
  41 #include <linux/usb/gadget.h>
  42 #include <linux/usb/g_printer.h>
  43
  44 #include "gadget_chips.h"
  45
  46 USB_GADGET_COMPOSITE_OPTIONS();
  47
  48 #define DRIVER_DESC             "Printer Gadget"
  49 #define DRIVER_VERSION          "2007 OCT 06"
  50
  51 static DEFINE_MUTEX(printer_mutex);
  52 static const char shortname [] = "printer";
  53 static const char driver_desc [] = DRIVER_DESC;
  54
  55 static dev_t g_printer_devno;
  56
  57 static struct class *usb_gadget_class;
  58
  59 /*-------------------------------------------------------------------------*/
  60
  61 struct printer_dev {
  62         spinlock_t              lock;           /* lock this structure */
  63         /* lock buffer lists during read/write calls */
  64         struct mutex            lock_printer_io;
  65         struct usb_gadget       *gadget;
  66         s8                      interface;
  67         struct usb_ep           *in_ep, *out_ep;
  68
  69         struct list_head        rx_reqs;        /* List of free RX structs */
  70         struct list_head        rx_reqs_active; /* List of Active RX xfers */
  71         struct list_head        rx_buffers;     /* List of completed xfers */
  72         /* wait until there is data to be read. */
  73         wait_queue_head_t       rx_wait;
  74         struct list_head        tx_reqs;        /* List of free TX structs */
  75         struct list_head        tx_reqs_active; /* List of Active TX xfers */
  76         /* Wait until there are write buffers available to use. */
  77         wait_queue_head_t       tx_wait;
  78         /* Wait until all write buffers have been sent. */
  79         wait_queue_head_t       tx_flush_wait;
  80         struct usb_request      *current_rx_req;
  81         size_t                  current_rx_bytes;
  82         u8                      *current_rx_buf;
  83         u8                      printer_status;
  84         u8                      reset_printer;
  85         struct cdev             printer_cdev;
  86         u8                      printer_cdev_open;
  87         wait_queue_head_t       wait;
  88         unsigned                q_len;
  89         char                    *pnp_string;    /* We don't own memory! */
  90         struct usb_function     function;
  91 };
  92
  93 static struct printer_dev usb_printer_gadget;
  94
  95 /*-------------------------------------------------------------------------*/
  96
  97 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
  98  * Instead:  allocate your own, using normal USB-IF procedures.
  99  */
 100
 101 /* Thanks to NetChip Technologies for donating this product ID.
 102  */
 103 #define PRINTER_VENDOR_NUM      0x0525          /* NetChip */
 104 #define PRINTER_PRODUCT_NUM     0xa4a8          /* Linux-USB Printer Gadget */
 105
 106 /* Some systems will want different product identifiers published in the
 107  * device descriptor, either numbers or strings or both.  These string
 108  * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
 109  */
 110
 111 module_param_named(iSerialNum, coverwrite.serial_number, charp, S_IRUGO);
 112 MODULE_PARM_DESC(iSerialNum, "1");
 113
 114 static char *iPNPstring;
 115 module_param(iPNPstring, charp, S_IRUGO);
 116 MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
 117
 118 /* Number of requests to allocate per endpoint, not used for ep0. */
 119 static unsigned qlen = 10;
 120 module_param(qlen, uint, S_IRUGO|S_IWUSR);
 121
 122 #define QLEN    qlen
 123
 124 /*-------------------------------------------------------------------------*/
 125
 126 /*
 127  * DESCRIPTORS ... most are static, but strings and (full) configuration
 128  * descriptors are built on demand.
 129  */
 130
 131 /* holds our biggest descriptor */
 132 #define USB_DESC_BUFSIZE                256
 133 #define USB_BUFSIZE                     8192
 134
 135 static struct usb_device_descriptor device_desc = {
 136         .bLength =              sizeof device_desc,
 137         .bDescriptorType =      USB_DT_DEVICE,
 138         .bcdUSB =               cpu_to_le16(0x0200),
 139         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
 140         .bDeviceSubClass =      0,
 141         .bDeviceProtocol =      0,
 142         .idVendor =             cpu_to_le16(PRINTER_VENDOR_NUM),
 143         .idProduct =            cpu_to_le16(PRINTER_PRODUCT_NUM),
 144         .bNumConfigurations =   1
 145 };
 146
 147 static struct usb_interface_descriptor intf_desc = {
 148         .bLength =              sizeof intf_desc,
 149         .bDescriptorType =      USB_DT_INTERFACE,
 150         .bNumEndpoints =        2,
 151         .bInterfaceClass =      USB_CLASS_PRINTER,
 152         .bInterfaceSubClass =   1,      /* Printer Sub-Class */
 153         .bInterfaceProtocol =   2,      /* Bi-Directional */
 154         .iInterface =           0
 155 };
 156
 157 static struct usb_endpoint_descriptor fs_ep_in_desc = {
 158         .bLength =              USB_DT_ENDPOINT_SIZE,
 159         .bDescriptorType =      USB_DT_ENDPOINT,
 160         .bEndpointAddress =     USB_DIR_IN,
 161         .bmAttributes =         USB_ENDPOINT_XFER_BULK
 162 };
 163
 164 static struct usb_endpoint_descriptor fs_ep_out_desc = {
 165         .bLength =              USB_DT_ENDPOINT_SIZE,
 166         .bDescriptorType =      USB_DT_ENDPOINT,
 167         .bEndpointAddress =     USB_DIR_OUT,
 168         .bmAttributes =         USB_ENDPOINT_XFER_BULK
 169 };
 170
 171 static struct usb_descriptor_header *fs_printer_function[] = {
 172         (struct usb_descriptor_header *) &intf_desc,
 173         (struct usb_descriptor_header *) &fs_ep_in_desc,
 174         (struct usb_descriptor_header *) &fs_ep_out_desc,
 175         NULL
 176 };
 177
 178 /*
 179  * usb 2.0 devices need to expose both high speed and full speed
 180  * descriptors, unless they only run at full speed.
 181  */
 182
 183 static struct usb_endpoint_descriptor hs_ep_in_desc = {
 184         .bLength =              USB_DT_ENDPOINT_SIZE,
 185         .bDescriptorType =      USB_DT_ENDPOINT,
 186         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 187         .wMaxPacketSize =       cpu_to_le16(512)
 188 };
 189
 190 static struct usb_endpoint_descriptor hs_ep_out_desc = {
 191         .bLength =              USB_DT_ENDPOINT_SIZE,
 192         .bDescriptorType =      USB_DT_ENDPOINT,
 193         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 194         .wMaxPacketSize =       cpu_to_le16(512)
 195 };
 196
 197 static struct usb_qualifier_descriptor dev_qualifier = {
 198         .bLength =              sizeof dev_qualifier,
 199         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
 200         .bcdUSB =               cpu_to_le16(0x0200),
 201         .bDeviceClass =         USB_CLASS_PRINTER,
 202         .bNumConfigurations =   1
 203 };
 204
 205 static struct usb_descriptor_header *hs_printer_function[] = {
 206         (struct usb_descriptor_header *) &intf_desc,
 207         (struct usb_descriptor_header *) &hs_ep_in_desc,
 208         (struct usb_descriptor_header *) &hs_ep_out_desc,
 209         NULL
 210 };
 211
 212 /*
 213  * Added endpoint descriptors for 3.0 devices
 214  */
 215
 216 static struct usb_endpoint_descriptor ss_ep_in_desc = {
 217         .bLength =              USB_DT_ENDPOINT_SIZE,
 218         .bDescriptorType =      USB_DT_ENDPOINT,
 219         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 220         .wMaxPacketSize =       cpu_to_le16(1024),
 221 };
 222
 223 static struct usb_ss_ep_comp_descriptor ss_ep_in_comp_desc = {
 224         .bLength =              sizeof(ss_ep_in_comp_desc),
 225         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
 226 };
 227
 228 static struct usb_endpoint_descriptor ss_ep_out_desc = {
 229         .bLength =              USB_DT_ENDPOINT_SIZE,
 230         .bDescriptorType =      USB_DT_ENDPOINT,
 231         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 232         .wMaxPacketSize =       cpu_to_le16(1024),
 233 };
 234
 235 static struct usb_ss_ep_comp_descriptor ss_ep_out_comp_desc = {
 236         .bLength =              sizeof(ss_ep_out_comp_desc),
 237         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
 238 };
 239
 240 static struct usb_descriptor_header *ss_printer_function[] = {
 241         (struct usb_descriptor_header *) &intf_desc,
 242         (struct usb_descriptor_header *) &ss_ep_in_desc,
 243         (struct usb_descriptor_header *) &ss_ep_in_comp_desc,
 244         (struct usb_descriptor_header *) &ss_ep_out_desc,
 245         (struct usb_descriptor_header *) &ss_ep_out_comp_desc,
 246         NULL
 247 };
 248
 249 static struct usb_otg_descriptor otg_descriptor = {
 250         .bLength =              sizeof otg_descriptor,
 251         .bDescriptorType =      USB_DT_OTG,
 252         .bmAttributes =         USB_OTG_SRP,
 253 };
 254
 255 static const struct usb_descriptor_header *otg_desc[] = {
 256         (struct usb_descriptor_header *) &otg_descriptor,
 257         NULL,
 258 };
 259
 260 /* maxpacket and other transfer characteristics vary by speed. */
 261 static inline struct usb_endpoint_descriptor *ep_desc(struct usb_gadget *gadget,
 262                                         struct usb_endpoint_descriptor *fs,
 263                                         struct usb_endpoint_descriptor *hs,
 264                                         struct usb_endpoint_descriptor *ss)
 265 {
 266         switch (gadget->speed) {
 267         case USB_SPEED_SUPER:
 268                 return ss;
 269         case USB_SPEED_HIGH:
 270                 return hs;
 271         default:
 272                 return fs;
 273         }
 274 }
 275
 276 /*-------------------------------------------------------------------------*/
 277
 278 /* descriptors that are built on-demand */
 279
 280 #define PNP_STRING_LEN                  1024
 281
 282 static char                             product_desc [40] = DRIVER_DESC;
 283 static char                             serial_num [40] = "1";
 284 static char                             pnp_string[PNP_STRING_LEN] =
 285         "XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
 286
 287 /* static strings, in UTF-8 */
 288 static struct usb_string                strings [] = {
 289         [USB_GADGET_MANUFACTURER_IDX].s = "",
 290         [USB_GADGET_PRODUCT_IDX].s = product_desc,
 291         [USB_GADGET_SERIAL_IDX].s =     serial_num,
 292         {  }            /* end of list */
 293 };
 294
 295 static struct usb_gadget_strings        stringtab_dev = {
 296         .language       = 0x0409,       /* en-us */
 297         .strings        = strings,
 298 };
 299
 300 static struct usb_gadget_strings *dev_strings[] = {
 301         &stringtab_dev,
 302         NULL,
 303 };
 304
 305 /*-------------------------------------------------------------------------*/
 306
 307 static struct usb_request *
 308 printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
 309 {
 310         struct usb_request      *req;
 311
 312         req = usb_ep_alloc_request(ep, gfp_flags);
 313
 314         if (req != NULL) {
 315                 req->length = len;
 316                 req->buf = kmalloc(len, gfp_flags);
 317                 if (req->buf == NULL) {
 318                         usb_ep_free_request(ep, req);
 319                         return NULL;
 320                 }
 321         }
 322
 323         return req;
 324 }
 325
 326 static void
 327 printer_req_free(struct usb_ep *ep, struct usb_request *req)
 328 {
 329         if (ep != NULL && req != NULL) {
 330                 kfree(req->buf);
 331                 usb_ep_free_request(ep, req);
 332         }
 333 }
 334
 335 /*-------------------------------------------------------------------------*/
 336
 337 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
 338 {
 339         struct printer_dev      *dev = ep->driver_data;
 340         int                     status = req->status;
 341         unsigned long           flags;
 342
 343         spin_lock_irqsave(&dev->lock, flags);
 344
 345         list_del_init(&req->list);      /* Remode from Active List */
 346
 347         switch (status) {
 348
 349         /* normal completion */
 350         case 0:
 351                 if (req->actual > 0) {
 352                         list_add_tail(&req->list, &dev->rx_buffers);
 353                         DBG(dev, "G_Printer : rx length %d\n", req->actual);
 354                 } else {
 355                         list_add(&req->list, &dev->rx_reqs);
 356                 }
 357                 break;
 358
 359         /* software-driven interface shutdown */
 360         case -ECONNRESET:               /* unlink */
 361         case -ESHUTDOWN:                /* disconnect etc */
 362                 VDBG(dev, "rx shutdown, code %d\n", status);
 363                 list_add(&req->list, &dev->rx_reqs);
 364                 break;
 365
 366         /* for hardware automagic (such as pxa) */
 367         case -ECONNABORTED:             /* endpoint reset */
 368                 DBG(dev, "rx %s reset\n", ep->name);
 369                 list_add(&req->list, &dev->rx_reqs);
 370                 break;
 371
 372         /* data overrun */
 373         case -EOVERFLOW:
 374                 /* FALLTHROUGH */
 375
 376         default:
 377                 DBG(dev, "rx status %d\n", status);
 378                 list_add(&req->list, &dev->rx_reqs);
 379                 break;
 380         }
 381
 382         wake_up_interruptible(&dev->rx_wait);
 383         spin_unlock_irqrestore(&dev->lock, flags);
 384 }
 385
 386 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
 387 {
 388         struct printer_dev      *dev = ep->driver_data;
 389
 390         switch (req->status) {
 391         default:
 392                 VDBG(dev, "tx err %d\n", req->status);
 393                 /* FALLTHROUGH */
 394         case -ECONNRESET:               /* unlink */
 395         case -ESHUTDOWN:                /* disconnect etc */
 396                 break;
 397         case 0:
 398                 break;
 399         }
 400
 401         spin_lock(&dev->lock);
 402         /* Take the request struct off the active list and put it on the
 403          * free list.
 404          */
 405         list_del_init(&req->list);
 406         list_add(&req->list, &dev->tx_reqs);
 407         wake_up_interruptible(&dev->tx_wait);
 408         if (likely(list_empty(&dev->tx_reqs_active)))
 409                 wake_up_interruptible(&dev->tx_flush_wait);
 410
 411         spin_unlock(&dev->lock);
 412 }
 413
 414 /*-------------------------------------------------------------------------*/
 415
 416 static int
 417 printer_open(struct inode *inode, struct file *fd)
 418 {
 419         struct printer_dev      *dev;
 420         unsigned long           flags;
 421         int                     ret = -EBUSY;
 422
 423         mutex_lock(&printer_mutex);
 424         dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
 425
 426         spin_lock_irqsave(&dev->lock, flags);
 427
 428         if (!dev->printer_cdev_open) {
 429                 dev->printer_cdev_open = 1;
 430                 fd->private_data = dev;
 431                 ret = 0;
 432                 /* Change the printer status to show that it's on-line. */
 433                 dev->printer_status |= PRINTER_SELECTED;
 434         }
 435
 436         spin_unlock_irqrestore(&dev->lock, flags);
 437
 438         DBG(dev, "printer_open returned %x\n", ret);
 439         mutex_unlock(&printer_mutex);
 440         return ret;
 441 }
 442
 443 static int
 444 printer_close(struct inode *inode, struct file *fd)
 445 {
 446         struct printer_dev      *dev = fd->private_data;
 447         unsigned long           flags;
 448
 449         spin_lock_irqsave(&dev->lock, flags);
 450         dev->printer_cdev_open = 0;
 451         fd->private_data = NULL;
 452         /* Change printer status to show that the printer is off-line. */
 453         dev->printer_status &= ~PRINTER_SELECTED;
 454         spin_unlock_irqrestore(&dev->lock, flags);
 455
 456         DBG(dev, "printer_close\n");
 457
 458         return 0;
 459 }
 460
 461 /* This function must be called with interrupts turned off. */
 462 static void
 463 setup_rx_reqs(struct printer_dev *dev)
 464 {
 465         struct usb_request              *req;
 466
 467         while (likely(!list_empty(&dev->rx_reqs))) {
 468                 int error;
 469
 470                 req = container_of(dev->rx_reqs.next,
 471                                 struct usb_request, list);
 472                 list_del_init(&req->list);
 473
 474                 /* The USB Host sends us whatever amount of data it wants to
 475                  * so we always set the length field to the full USB_BUFSIZE.
 476                  * If the amount of data is more than the read() caller asked
 477                  * for it will be stored in the request buffer until it is
 478                  * asked for by read().
 479                  */
 480                 req->length = USB_BUFSIZE;
 481                 req->complete = rx_complete;
 482
 483                 /* here, we unlock, and only unlock, to avoid deadlock. */
 484                 spin_unlock(&dev->lock);
 485                 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
 486                 spin_lock(&dev->lock);
 487                 if (error) {
 488                         DBG(dev, "rx submit --> %d\n", error);
 489                         list_add(&req->list, &dev->rx_reqs);
 490                         break;
 491                 }
 492                 /* if the req is empty, then add it into dev->rx_reqs_active. */
 493                 else if (list_empty(&req->list)) {
 494                         list_add(&req->list, &dev->rx_reqs_active);
 495                 }
 496         }
 497 }
 498
 499 static ssize_t
 500 printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
 501 {
 502         struct printer_dev              *dev = fd->private_data;
 503         unsigned long                   flags;
 504         size_t                          size;
 505         size_t                          bytes_copied;
 506         struct usb_request              *req;
 507         /* This is a pointer to the current USB rx request. */
 508         struct usb_request              *current_rx_req;
 509         /* This is the number of bytes in the current rx buffer. */
 510         size_t                          current_rx_bytes;
 511         /* This is a pointer to the current rx buffer. */
 512         u8                              *current_rx_buf;
 513
 514         if (len == 0)
 515                 return -EINVAL;
 516
 517         DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
 518
 519         mutex_lock(&dev->lock_printer_io);
 520         spin_lock_irqsave(&dev->lock, flags);
 521
 522         /* We will use this flag later to check if a printer reset happened
 523          * after we turn interrupts back on.
 524          */
 525         dev->reset_printer = 0;
 526
 527         setup_rx_reqs(dev);
 528
 529         bytes_copied = 0;
 530         current_rx_req = dev->current_rx_req;
 531         current_rx_bytes = dev->current_rx_bytes;
 532         current_rx_buf = dev->current_rx_buf;
 533         dev->current_rx_req = NULL;
 534         dev->current_rx_bytes = 0;
 535         dev->current_rx_buf = NULL;
 536
 537         /* Check if there is any data in the read buffers. Please note that
 538          * current_rx_bytes is the number of bytes in the current rx buffer.
 539          * If it is zero then check if there are any other rx_buffers that
 540          * are on the completed list. We are only out of data if all rx
 541          * buffers are empty.
 542          */
 543         if ((current_rx_bytes == 0) &&
 544                         (likely(list_empty(&dev->rx_buffers)))) {
 545                 /* Turn interrupts back on before sleeping. */
 546                 spin_unlock_irqrestore(&dev->lock, flags);
 547
 548                 /*
 549                  * If no data is available check if this is a NON-Blocking
 550                  * call or not.
 551                  */
 552                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 553                         mutex_unlock(&dev->lock_printer_io);
 554                         return -EAGAIN;
 555                 }
 556
 557                 /* Sleep until data is available */
 558                 wait_event_interruptible(dev->rx_wait,
 559                                 (likely(!list_empty(&dev->rx_buffers))));
 560                 spin_lock_irqsave(&dev->lock, flags);
 561         }
 562
 563         /* We have data to return then copy it to the caller's buffer.*/
 564         while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
 565                         && len) {
 566                 if (current_rx_bytes == 0) {
 567                         req = container_of(dev->rx_buffers.next,
 568                                         struct usb_request, list);
 569                         list_del_init(&req->list);
 570
 571                         if (req->actual && req->buf) {
 572                                 current_rx_req = req;
 573                                 current_rx_bytes = req->actual;
 574                                 current_rx_buf = req->buf;
 575                         } else {
 576                                 list_add(&req->list, &dev->rx_reqs);
 577                                 continue;
 578                         }
 579                 }
 580
 581                 /* Don't leave irqs off while doing memory copies */
 582                 spin_unlock_irqrestore(&dev->lock, flags);
 583
 584                 if (len > current_rx_bytes)
 585                         size = current_rx_bytes;
 586                 else
 587                         size = len;
 588
 589                 size -= copy_to_user(buf, current_rx_buf, size);
 590                 bytes_copied += size;
 591                 len -= size;
 592                 buf += size;
 593
 594                 spin_lock_irqsave(&dev->lock, flags);
 595
 596                 /* We've disconnected or reset so return. */
 597                 if (dev->reset_printer) {
 598                         list_add(&current_rx_req->list, &dev->rx_reqs);
 599                         spin_unlock_irqrestore(&dev->lock, flags);
 600                         mutex_unlock(&dev->lock_printer_io);
 601                         return -EAGAIN;
 602                 }
 603
 604                 /* If we not returning all the data left in this RX request
 605                  * buffer then adjust the amount of data left in the buffer.
 606                  * Othewise if we are done with this RX request buffer then
 607                  * requeue it to get any incoming data from the USB host.
 608                  */
 609                 if (size < current_rx_bytes) {
 610                         current_rx_bytes -= size;
 611                         current_rx_buf += size;
 612                 } else {
 613                         list_add(&current_rx_req->list, &dev->rx_reqs);
 614                         current_rx_bytes = 0;
 615                         current_rx_buf = NULL;
 616                         current_rx_req = NULL;
 617                 }
 618         }
 619
 620         dev->current_rx_req = current_rx_req;
 621         dev->current_rx_bytes = current_rx_bytes;
 622         dev->current_rx_buf = current_rx_buf;
 623
 624         spin_unlock_irqrestore(&dev->lock, flags);
 625         mutex_unlock(&dev->lock_printer_io);
 626
 627         DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
 628
 629         if (bytes_copied)
 630                 return bytes_copied;
 631         else
 632                 return -EAGAIN;
 633 }
 634
 635 static ssize_t
 636 printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 637 {
 638         struct printer_dev      *dev = fd->private_data;
 639         unsigned long           flags;
 640         size_t                  size;   /* Amount of data in a TX request. */
 641         size_t                  bytes_copied = 0;
 642         struct usb_request      *req;
 643
 644         DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
 645
 646         if (len == 0)
 647                 return -EINVAL;
 648
 649         mutex_lock(&dev->lock_printer_io);
 650         spin_lock_irqsave(&dev->lock, flags);
 651
 652         /* Check if a printer reset happens while we have interrupts on */
 653         dev->reset_printer = 0;
 654
 655         /* Check if there is any available write buffers */
 656         if (likely(list_empty(&dev->tx_reqs))) {
 657                 /* Turn interrupts back on before sleeping. */
 658                 spin_unlock_irqrestore(&dev->lock, flags);
 659
 660                 /*
 661                  * If write buffers are available check if this is
 662                  * a NON-Blocking call or not.
 663                  */
 664                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 665                         mutex_unlock(&dev->lock_printer_io);
 666                         return -EAGAIN;
 667                 }
 668
 669                 /* Sleep until a write buffer is available */
 670                 wait_event_interruptible(dev->tx_wait,
 671                                 (likely(!list_empty(&dev->tx_reqs))));
 672                 spin_lock_irqsave(&dev->lock, flags);
 673         }
 674
 675         while (likely(!list_empty(&dev->tx_reqs)) && len) {
 676
 677                 if (len > USB_BUFSIZE)
 678                         size = USB_BUFSIZE;
 679                 else
 680                         size = len;
 681
 682                 req = container_of(dev->tx_reqs.next, struct usb_request,
 683                                 list);
 684                 list_del_init(&req->list);
 685
 686                 req->complete = tx_complete;
 687                 req->length = size;
 688
 689                 /* Check if we need to send a zero length packet. */
 690                 if (len > size)
 691                         /* They will be more TX requests so no yet. */
 692                         req->zero = 0;
 693                 else
 694                         /* If the data amount is not a multple of the
 695                          * maxpacket size then send a zero length packet.
 696                          */
 697                         req->zero = ((len % dev->in_ep->maxpacket) == 0);
 698
 699                 /* Don't leave irqs off while doing memory copies */
 700                 spin_unlock_irqrestore(&dev->lock, flags);
 701
 702                 if (copy_from_user(req->buf, buf, size)) {
 703                         list_add(&req->list, &dev->tx_reqs);
 704                         mutex_unlock(&dev->lock_printer_io);
 705                         return bytes_copied;
 706                 }
 707
 708                 bytes_copied += size;
 709                 len -= size;
 710                 buf += size;
 711
 712                 spin_lock_irqsave(&dev->lock, flags);
 713
 714                 /* We've disconnected or reset so free the req and buffer */
 715                 if (dev->reset_printer) {
 716                         list_add(&req->list, &dev->tx_reqs);
 717                         spin_unlock_irqrestore(&dev->lock, flags);
 718                         mutex_unlock(&dev->lock_printer_io);
 719                         return -EAGAIN;
 720                 }
 721
 722                 if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
 723                         list_add(&req->list, &dev->tx_reqs);
 724                         spin_unlock_irqrestore(&dev->lock, flags);
 725                         mutex_unlock(&dev->lock_printer_io);
 726                         return -EAGAIN;
 727                 }
 728
 729                 list_add(&req->list, &dev->tx_reqs_active);
 730
 731         }
 732
 733         spin_unlock_irqrestore(&dev->lock, flags);
 734         mutex_unlock(&dev->lock_printer_io);
 735
 736         DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
 737
 738         if (bytes_copied) {
 739                 return bytes_copied;
 740         } else {
 741                 return -EAGAIN;
 742         }
 743 }
 744
 745 static int
 746 printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync)
 747 {
 748         struct printer_dev      *dev = fd->private_data;
 749         struct inode *inode = file_inode(fd);
 750         unsigned long           flags;
 751         int                     tx_list_empty;
 752
 753         mutex_lock(&inode->i_mutex);
 754         spin_lock_irqsave(&dev->lock, flags);
 755         tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
 756         spin_unlock_irqrestore(&dev->lock, flags);
 757
 758         if (!tx_list_empty) {
 759                 /* Sleep until all data has been sent */
 760                 wait_event_interruptible(dev->tx_flush_wait,
 761                                 (likely(list_empty(&dev->tx_reqs_active))));
 762         }
 763         mutex_unlock(&inode->i_mutex);
 764
 765         return 0;
 766 }
 767
 768 static unsigned int
 769 printer_poll(struct file *fd, poll_table *wait)
 770 {
 771         struct printer_dev      *dev = fd->private_data;
 772         unsigned long           flags;
 773         int                     status = 0;
 774
 775         mutex_lock(&dev->lock_printer_io);
 776         spin_lock_irqsave(&dev->lock, flags);
 777         setup_rx_reqs(dev);
 778         spin_unlock_irqrestore(&dev->lock, flags);
 779         mutex_unlock(&dev->lock_printer_io);
 780
 781         poll_wait(fd, &dev->rx_wait, wait);
 782         poll_wait(fd, &dev->tx_wait, wait);
 783
 784         spin_lock_irqsave(&dev->lock, flags);
 785         if (likely(!list_empty(&dev->tx_reqs)))
 786                 status |= POLLOUT | POLLWRNORM;
 787
 788         if (likely(dev->current_rx_bytes) ||
 789                         likely(!list_empty(&dev->rx_buffers)))
 790                 status |= POLLIN | POLLRDNORM;
 791
 792         spin_unlock_irqrestore(&dev->lock, flags);
 793
 794         return status;
 795 }
 796
 797 static long
 798 printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
 799 {
 800         struct printer_dev      *dev = fd->private_data;
 801         unsigned long           flags;
 802         int                     status = 0;
 803
 804         DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
 805
 806         /* handle ioctls */
 807
 808         spin_lock_irqsave(&dev->lock, flags);
 809
 810         switch (code) {
 811         case GADGET_GET_PRINTER_STATUS:
 812                 status = (int)dev->printer_status;
 813                 break;
 814         case GADGET_SET_PRINTER_STATUS:
 815                 dev->printer_status = (u8)arg;
 816                 break;
 817         default:
 818                 /* could not handle ioctl */
 819                 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
 820                                 code);
 821                 status = -ENOTTY;
 822         }
 823
 824         spin_unlock_irqrestore(&dev->lock, flags);
 825
 826         return status;
 827 }
 828
 829 /* used after endpoint configuration */
 830 static const struct file_operations printer_io_operations = {
 831         .owner =        THIS_MODULE,
 832         .open =         printer_open,
 833         .read =         printer_read,
 834         .write =        printer_write,
 835         .fsync =        printer_fsync,
 836         .poll =         printer_poll,
 837         .unlocked_ioctl = printer_ioctl,
 838         .release =      printer_close,
 839         .llseek =       noop_llseek,
 840 };
 841
 842 /*-------------------------------------------------------------------------*/
 843
 844 static int
 845 set_printer_interface(struct printer_dev *dev)
 846 {
 847         int                     result = 0;
 848
 849         dev->in_ep->desc = ep_desc(dev->gadget, &fs_ep_in_desc, &hs_ep_in_desc,
 850                                 &ss_ep_in_desc);
 851         dev->in_ep->driver_data = dev;
 852
 853         dev->out_ep->desc = ep_desc(dev->gadget, &fs_ep_out_desc,
 854                                     &hs_ep_out_desc, &ss_ep_out_desc);
 855         dev->out_ep->driver_data = dev;
 856
 857         result = usb_ep_enable(dev->in_ep);
 858         if (result != 0) {
 859                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 860                 goto done;
 861         }
 862
 863         result = usb_ep_enable(dev->out_ep);
 864         if (result != 0) {
 865                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 866                 goto done;
 867         }
 868
 869 done:
 870         /* on error, disable any endpoints  */
 871         if (result != 0) {
 872                 (void) usb_ep_disable(dev->in_ep);
 873                 (void) usb_ep_disable(dev->out_ep);
 874                 dev->in_ep->desc = NULL;
 875                 dev->out_ep->desc = NULL;
 876         }
 877
 878         /* caller is responsible for cleanup on error */
 879         return result;
 880 }
 881
 882 static void printer_reset_interface(struct printer_dev *dev)
 883 {
 884         if (dev->interface < 0)
 885                 return;
 886
 887         DBG(dev, "%s\n", __func__);
 888
 889         if (dev->in_ep->desc)
 890                 usb_ep_disable(dev->in_ep);
 891
 892         if (dev->out_ep->desc)
 893                 usb_ep_disable(dev->out_ep);
 894
 895         dev->in_ep->desc = NULL;
 896         dev->out_ep->desc = NULL;
 897         dev->interface = -1;
 898 }
 899
 900 /* Change our operational Interface. */
 901 static int set_interface(struct printer_dev *dev, unsigned number)
 902 {
 903         int                     result = 0;
 904
 905         /* Free the current interface */
 906         printer_reset_interface(dev);
 907
 908         result = set_printer_interface(dev);
 909         if (result)
 910                 printer_reset_interface(dev);
 911         else
 912                 dev->interface = number;
 913
 914         if (!result)
 915                 INFO(dev, "Using interface %x\n", number);
 916
 917         return result;
 918 }
 919
 920 static void printer_soft_reset(struct printer_dev *dev)
 921 {
 922         struct usb_request      *req;
 923
 924         INFO(dev, "Received Printer Reset Request\n");
 925
 926         if (usb_ep_disable(dev->in_ep))
 927                 DBG(dev, "Failed to disable USB in_ep\n");
 928         if (usb_ep_disable(dev->out_ep))
 929                 DBG(dev, "Failed to disable USB out_ep\n");
 930
 931         if (dev->current_rx_req != NULL) {
 932                 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
 933                 dev->current_rx_req = NULL;
 934         }
 935         dev->current_rx_bytes = 0;
 936         dev->current_rx_buf = NULL;
 937         dev->reset_printer = 1;
 938
 939         while (likely(!(list_empty(&dev->rx_buffers)))) {
 940                 req = container_of(dev->rx_buffers.next, struct usb_request,
 941                                 list);
 942                 list_del_init(&req->list);
 943                 list_add(&req->list, &dev->rx_reqs);
 944         }
 945
 946         while (likely(!(list_empty(&dev->rx_reqs_active)))) {
 947                 req = container_of(dev->rx_buffers.next, struct usb_request,
 948                                 list);
 949                 list_del_init(&req->list);
 950                 list_add(&req->list, &dev->rx_reqs);
 951         }
 952
 953         while (likely(!(list_empty(&dev->tx_reqs_active)))) {
 954                 req = container_of(dev->tx_reqs_active.next,
 955                                 struct usb_request, list);
 956                 list_del_init(&req->list);
 957                 list_add(&req->list, &dev->tx_reqs);
 958         }
 959
 960         if (usb_ep_enable(dev->in_ep))
 961                 DBG(dev, "Failed to enable USB in_ep\n");
 962         if (usb_ep_enable(dev->out_ep))
 963                 DBG(dev, "Failed to enable USB out_ep\n");
 964
 965         wake_up_interruptible(&dev->rx_wait);
 966         wake_up_interruptible(&dev->tx_wait);
 967         wake_up_interruptible(&dev->tx_flush_wait);
 968 }
 969
 970 /*-------------------------------------------------------------------------*/
 971
 972 /*
 973  * The setup() callback implements all the ep0 functionality that's not
 974  * handled lower down.
 975  */
 976 static int printer_func_setup(struct usb_function *f,
 977                 const struct usb_ctrlrequest *ctrl)
 978 {
 979         struct printer_dev *dev = container_of(f, struct printer_dev, function);
 980         struct usb_composite_dev *cdev = f->config->cdev;
 981         struct usb_request      *req = cdev->req;
 982         int                     value = -EOPNOTSUPP;
 983         u16                     wIndex = le16_to_cpu(ctrl->wIndex);
 984         u16                     wValue = le16_to_cpu(ctrl->wValue);
 985         u16                     wLength = le16_to_cpu(ctrl->wLength);
 986
 987         DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
 988                 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
 989
 990         switch (ctrl->bRequestType&USB_TYPE_MASK) {
 991         case USB_TYPE_CLASS:
 992                 switch (ctrl->bRequest) {
 993                 case 0: /* Get the IEEE-1284 PNP String */
 994                         /* Only one printer interface is supported. */
 995                         if ((wIndex>>8) != dev->interface)
 996                                 break;
 997
 998                         value = (dev->pnp_string[0] << 8) | dev->pnp_string[1];
 999                         memcpy(req->buf, dev->pnp_string, value);
1000                         DBG(dev, "1284 PNP String: %x %s\n", value,
1001                                         &dev->pnp_string[2]);
1002                         break;
1003
1004                 case 1: /* Get Port Status */
1005                         /* Only one printer interface is supported. */
1006                         if (wIndex != dev->interface)
1007                                 break;
1008
1009                         *(u8 *)req->buf = dev->printer_status;
1010                         value = min(wLength, (u16) 1);
1011                         break;
1012
1013                 case 2: /* Soft Reset */
1014                         /* Only one printer interface is supported. */
1015                         if (wIndex != dev->interface)
1016                                 break;
1017
1018                         printer_soft_reset(dev);
1019
1020                         value = 0;
1021                         break;
1022
1023                 default:
1024                         goto unknown;
1025                 }
1026                 break;
1027
1028         default:
1029 unknown:
1030                 VDBG(dev,
1031                         "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1032                         ctrl->bRequestType, ctrl->bRequest,
1033                         wValue, wIndex, wLength);
1034                 break;
1035         }
1036         /* host either stalls (value < 0) or reports success */
1037         if (value >= 0) {
1038                 req->length = value;
1039                 req->zero = value < wLength;
1040                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1041                 if (value < 0) {
1042                         ERROR(dev, "%s:%d Error!\n", __func__, __LINE__);
1043                         req->status = 0;
1044                 }
1045         }
1046         return value;
1047 }
1048
1049 static int __init printer_func_bind(struct usb_configuration *c,
1050                 struct usb_function *f)
1051 {
1052         struct usb_gadget *gadget = c->cdev->gadget;
1053         struct printer_dev *dev = container_of(f, struct printer_dev, function);
1054         struct device *pdev;
1055         struct usb_composite_dev *cdev = c->cdev;
1056         struct usb_ep *in_ep;
1057         struct usb_ep *out_ep = NULL;
1058         struct usb_request *req;
1059         int id;
1060         int ret;
1061         u32 i;
1062
1063         id = usb_interface_id(c, f);
1064         if (id < 0)
1065                 return id;
1066         intf_desc.bInterfaceNumber = id;
1067
1068         /* finish hookup to lower layer ... */
1069         dev->gadget = gadget;
1070
1071         /* all we really need is bulk IN/OUT */
1072         in_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_in_desc);
1073         if (!in_ep) {
1074 autoconf_fail:
1075                 dev_err(&cdev->gadget->dev, "can't autoconfigure on %s\n",
1076                         cdev->gadget->name);
1077                 return -ENODEV;
1078         }
1079         in_ep->driver_data = in_ep;     /* claim */
1080
1081         out_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_out_desc);
1082         if (!out_ep)
1083                 goto autoconf_fail;
1084         out_ep->driver_data = out_ep;   /* claim */
1085
1086         /* assumes that all endpoints are dual-speed */
1087         hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1088         hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1089         ss_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1090         ss_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1091
1092         ret = usb_assign_descriptors(f, fs_printer_function,
1093                         hs_printer_function, ss_printer_function);
1094         if (ret)
1095                 return ret;
1096
1097         dev->in_ep = in_ep;
1098         dev->out_ep = out_ep;
1099
1100         ret = -ENOMEM;
1101         for (i = 0; i < dev->q_len; i++) {
1102                 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1103                 if (!req)
1104                         goto fail_tx_reqs;
1105                 list_add(&req->list, &dev->tx_reqs);
1106         }
1107
1108         for (i = 0; i < dev->q_len; i++) {
1109                 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1110                 if (!req)
1111                         goto fail_rx_reqs;
1112                 list_add(&req->list, &dev->rx_reqs);
1113         }
1114
1115         /* Setup the sysfs files for the printer gadget. */
1116         pdev = device_create(usb_gadget_class, NULL, g_printer_devno,
1117                                   NULL, "g_printer");
1118         if (IS_ERR(pdev)) {
1119                 ERROR(dev, "Failed to create device: g_printer\n");
1120                 ret = PTR_ERR(pdev);
1121                 goto fail_rx_reqs;
1122         }
1123
1124         /*
1125          * Register a character device as an interface to a user mode
1126          * program that handles the printer specific functionality.
1127          */
1128         cdev_init(&dev->printer_cdev, &printer_io_operations);
1129         dev->printer_cdev.owner = THIS_MODULE;
1130         ret = cdev_add(&dev->printer_cdev, g_printer_devno, 1);
1131         if (ret) {
1132                 ERROR(dev, "Failed to open char device\n");
1133                 goto fail_cdev_add;
1134         }
1135
1136         return 0;
1137
1138 fail_cdev_add:
1139         device_destroy(usb_gadget_class, g_printer_devno);
1140
1141 fail_rx_reqs:
1142         while (!list_empty(&dev->rx_reqs)) {
1143                 req = container_of(dev->rx_reqs.next, struct usb_request, list);
1144                 list_del(&req->list);
1145                 printer_req_free(dev->out_ep, req);
1146         }
1147
1148 fail_tx_reqs:
1149         while (!list_empty(&dev->tx_reqs)) {
1150                 req = container_of(dev->tx_reqs.next, struct usb_request, list);
1151                 list_del(&req->list);
1152                 printer_req_free(dev->in_ep, req);
1153         }
1154
1155         return ret;
1156
1157 }
1158
1159 static void printer_func_unbind(struct usb_configuration *c,
1160                 struct usb_function *f)
1161 {
1162         struct printer_dev      *dev;
1163         struct usb_request      *req;
1164
1165         dev = &usb_printer_gadget;
1166
1167         device_destroy(usb_gadget_class, g_printer_devno);
1168
1169         /* Remove Character Device */
1170         cdev_del(&dev->printer_cdev);
1171
1172         /* we must already have been disconnected ... no i/o may be active */
1173         WARN_ON(!list_empty(&dev->tx_reqs_active));
1174         WARN_ON(!list_empty(&dev->rx_reqs_active));
1175
1176         /* Free all memory for this driver. */
1177         while (!list_empty(&dev->tx_reqs)) {
1178                 req = container_of(dev->tx_reqs.next, struct usb_request,
1179                                 list);
1180                 list_del(&req->list);
1181                 printer_req_free(dev->in_ep, req);
1182         }
1183
1184         if (dev->current_rx_req != NULL)
1185                 printer_req_free(dev->out_ep, dev->current_rx_req);
1186
1187         while (!list_empty(&dev->rx_reqs)) {
1188                 req = container_of(dev->rx_reqs.next,
1189                                 struct usb_request, list);
1190                 list_del(&req->list);
1191                 printer_req_free(dev->out_ep, req);
1192         }
1193
1194         while (!list_empty(&dev->rx_buffers)) {
1195                 req = container_of(dev->rx_buffers.next,
1196                                 struct usb_request, list);
1197                 list_del(&req->list);
1198                 printer_req_free(dev->out_ep, req);
1199         }
1200         usb_free_all_descriptors(f);
1201 }
1202
1203 static int printer_func_set_alt(struct usb_function *f,
1204                 unsigned intf, unsigned alt)
1205 {
1206         struct printer_dev *dev = container_of(f, struct printer_dev, function);
1207         int ret = -ENOTSUPP;
1208
1209         if (!alt)
1210                 ret = set_interface(dev, intf);
1211
1212         return ret;
1213 }
1214
1215 static void printer_func_disable(struct usb_function *f)
1216 {
1217         struct printer_dev *dev = container_of(f, struct printer_dev, function);
1218         unsigned long           flags;
1219
1220         DBG(dev, "%s\n", __func__);
1221
1222         spin_lock_irqsave(&dev->lock, flags);
1223         printer_reset_interface(dev);
1224         spin_unlock_irqrestore(&dev->lock, flags);
1225 }
1226
1227 static struct usb_configuration printer_cfg_driver = {
1228         .label                  = "printer",
1229         .bConfigurationValue    = 1,
1230         .bmAttributes           = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
1231 };
1232
1233 static int f_printer_bind_config(struct usb_configuration *c, char *pnp_str,
1234                                  char *pnp_string, unsigned q_len)
1235 {
1236         struct printer_dev      *dev;
1237         int                     status = -ENOMEM;
1238         size_t                  len;
1239
1240         dev = &usb_printer_gadget;
1241         dev->pnp_string = pnp_string;
1242
1243         dev->function.name = shortname;
1244         dev->function.bind = printer_func_bind;
1245         dev->function.setup = printer_func_setup;
1246         dev->function.unbind = printer_func_unbind;
1247         dev->function.set_alt = printer_func_set_alt;
1248         dev->function.disable = printer_func_disable;
1249         INIT_LIST_HEAD(&dev->tx_reqs);
1250         INIT_LIST_HEAD(&dev->rx_reqs);
1251         INIT_LIST_HEAD(&dev->rx_buffers);
1252
1253         if (pnp_str)
1254                 strlcpy(&dev->pnp_string[2], pnp_str, PNP_STRING_LEN - 2);
1255
1256         len = strlen(pnp_string);
1257         pnp_string[0] = (len >> 8) & 0xFF;
1258         pnp_string[1] = len & 0xFF;
1259
1260         spin_lock_init(&dev->lock);
1261         mutex_init(&dev->lock_printer_io);
1262         INIT_LIST_HEAD(&dev->tx_reqs_active);
1263         INIT_LIST_HEAD(&dev->rx_reqs_active);
1264         init_waitqueue_head(&dev->rx_wait);
1265         init_waitqueue_head(&dev->tx_wait);
1266         init_waitqueue_head(&dev->tx_flush_wait);
1267
1268         dev->interface = -1;
1269         dev->printer_cdev_open = 0;
1270         dev->printer_status = PRINTER_NOT_ERROR;
1271         dev->current_rx_req = NULL;
1272         dev->current_rx_bytes = 0;
1273         dev->current_rx_buf = NULL;
1274         dev->q_len = q_len;
1275
1276         status = usb_add_function(c, &dev->function);
1277         if (status)
1278                 return status;
1279         INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
1280         return 0;
1281 }
1282
1283 static int __init printer_do_config(struct usb_configuration *c)
1284 {
1285         struct usb_gadget       *gadget = c->cdev->gadget;
1286
1287         usb_ep_autoconfig_reset(gadget);
1288
1289         usb_gadget_set_selfpowered(gadget);
1290
1291         if (gadget_is_otg(gadget)) {
1292                 otg_descriptor.bmAttributes |= USB_OTG_HNP;
1293                 printer_cfg_driver.descriptors = otg_desc;
1294                 printer_cfg_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1295         }
1296
1297         return f_printer_bind_config(c, iPNPstring, pnp_string, QLEN);
1298
1299 }
1300
1301 static int __init printer_bind(struct usb_composite_dev *cdev)
1302 {
1303         int ret;
1304
1305         ret = usb_string_ids_tab(cdev, strings);
1306         if (ret < 0)
1307                 return ret;
1308         device_desc.iManufacturer = strings[USB_GADGET_MANUFACTURER_IDX].id;
1309         device_desc.iProduct = strings[USB_GADGET_PRODUCT_IDX].id;
1310         device_desc.iSerialNumber = strings[USB_GADGET_SERIAL_IDX].id;
1311
1312         ret = usb_add_config(cdev, &printer_cfg_driver, printer_do_config);
1313         if (ret)
1314                 return ret;
1315         usb_composite_overwrite_options(cdev, &coverwrite);
1316         return ret;
1317 }
1318
1319 static __refdata struct usb_composite_driver printer_driver = {
1320         .name           = shortname,
1321         .dev            = &device_desc,
1322         .strings        = dev_strings,
1323         .max_speed      = USB_SPEED_SUPER,
1324         .bind           = printer_bind,
1325 };
1326
1327 static int __init
1328 init(void)
1329 {
1330         int status;
1331
1332         usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1333         if (IS_ERR(usb_gadget_class)) {
1334                 status = PTR_ERR(usb_gadget_class);
1335                 pr_err("unable to create usb_gadget class %d\n", status);
1336                 return status;
1337         }
1338
1339         status = alloc_chrdev_region(&g_printer_devno, 0, 1,
1340                         "USB printer gadget");
1341         if (status) {
1342                 pr_err("alloc_chrdev_region %d\n", status);
1343                 class_destroy(usb_gadget_class);
1344                 return status;
1345         }
1346
1347         status = usb_composite_probe(&printer_driver);
1348         if (status) {
1349                 class_destroy(usb_gadget_class);
1350                 unregister_chrdev_region(g_printer_devno, 1);
1351                 pr_err("usb_gadget_probe_driver %x\n", status);
1352         }
1353
1354         return status;
1355 }
1356 module_init(init);
1357
1358 static void __exit
1359 cleanup(void)
1360 {
1361         mutex_lock(&usb_printer_gadget.lock_printer_io);
1362         usb_composite_unregister(&printer_driver);
1363         unregister_chrdev_region(g_printer_devno, 1);
1364         class_destroy(usb_gadget_class);
1365         mutex_unlock(&usb_printer_gadget.lock_printer_io);
1366 }
1367 module_exit(cleanup);
1368
1369 MODULE_DESCRIPTION(DRIVER_DESC);
1370 MODULE_AUTHOR("Craig Nadler");
1371 MODULE_LICENSE("GPL");