drivers/usb/gadget/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  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/delay.h>
  25 #include <linux/ioport.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/errno.h>
  30 #include <linux/init.h>
  31 #include <linux/timer.h>
  32 #include <linux/list.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/utsname.h>
  35 #include <linux/device.h>
  36 #include <linux/moduleparam.h>
  37 #include <linux/fs.h>
  38 #include <linux/poll.h>
  39 #include <linux/types.h>
  40 #include <linux/ctype.h>
  41 #include <linux/cdev.h>
  42
  43 #include <asm/byteorder.h>
  44 #include <linux/io.h>
  45 #include <linux/irq.h>
  46 #include <asm/system.h>
  47 #include <linux/uaccess.h>
  48 #include <asm/unaligned.h>
  49
  50 #include <linux/usb/ch9.h>
  51 #include <linux/usb/gadget.h>
  52 #include <linux/usb/g_printer.h>
  53
  54 #include "gadget_chips.h"
  55
  56
  57 /*
  58  * Kbuild is not very cooperative with respect to linking separately
  59  * compiled library objects into one module.  So for now we won't use
  60  * separate compilation ... ensuring init/exit sections work to shrink
  61  * the runtime footprint, and giving us at least some parts of what
  62  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  63  */
  64 #include "usbstring.c"
  65 #include "config.c"
  66 #include "epautoconf.c"
  67
  68 /*-------------------------------------------------------------------------*/
  69
  70 #define DRIVER_DESC             "Printer Gadget"
  71 #define DRIVER_VERSION          "2007 OCT 06"
  72
  73 static const char shortname [] = "printer";
  74 static const char driver_desc [] = DRIVER_DESC;
  75
  76 static dev_t g_printer_devno;
  77
  78 static struct class *usb_gadget_class;
  79
  80 /*-------------------------------------------------------------------------*/
  81
  82 struct printer_dev {
  83         spinlock_t              lock;           /* lock this structure */
  84         /* lock buffer lists during read/write calls */
  85         struct mutex            lock_printer_io;
  86         struct usb_gadget       *gadget;
  87         struct usb_request      *req;           /* for control responses */
  88         u8                      config;
  89         s8                      interface;
  90         struct usb_ep           *in_ep, *out_ep;
  91         const struct usb_endpoint_descriptor
  92                                 *in, *out;
  93         struct list_head        rx_reqs;        /* List of free RX structs */
  94         struct list_head        rx_reqs_active; /* List of Active RX xfers */
  95         struct list_head        rx_buffers;     /* List of completed xfers */
  96         /* wait until there is data to be read. */
  97         wait_queue_head_t       rx_wait;
  98         struct list_head        tx_reqs;        /* List of free TX structs */
  99         struct list_head        tx_reqs_active; /* List of Active TX xfers */
 100         /* Wait until there are write buffers available to use. */
 101         wait_queue_head_t       tx_wait;
 102         /* Wait until all write buffers have been sent. */
 103         wait_queue_head_t       tx_flush_wait;
 104         struct usb_request      *current_rx_req;
 105         size_t                  current_rx_bytes;
 106         u8                      *current_rx_buf;
 107         u8                      printer_status;
 108         u8                      reset_printer;
 109         struct cdev             printer_cdev;
 110         struct device           *pdev;
 111         u8                      printer_cdev_open;
 112         wait_queue_head_t       wait;
 113 };
 114
 115 static struct printer_dev usb_printer_gadget;
 116
 117 /*-------------------------------------------------------------------------*/
 118
 119 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 120  * Instead:  allocate your own, using normal USB-IF procedures.
 121  */
 122
 123 /* Thanks to NetChip Technologies for donating this product ID.
 124  */
 125 #define PRINTER_VENDOR_NUM      0x0525          /* NetChip */
 126 #define PRINTER_PRODUCT_NUM     0xa4a8          /* Linux-USB Printer Gadget */
 127
 128 /* Some systems will want different product identifers published in the
 129  * device descriptor, either numbers or strings or both.  These string
 130  * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
 131  */
 132
 133 static ushort __initdata idVendor;
 134 module_param(idVendor, ushort, S_IRUGO);
 135 MODULE_PARM_DESC(idVendor, "USB Vendor ID");
 136
 137 static ushort __initdata idProduct;
 138 module_param(idProduct, ushort, S_IRUGO);
 139 MODULE_PARM_DESC(idProduct, "USB Product ID");
 140
 141 static ushort __initdata bcdDevice;
 142 module_param(bcdDevice, ushort, S_IRUGO);
 143 MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
 144
 145 static char *__initdata iManufacturer;
 146 module_param(iManufacturer, charp, S_IRUGO);
 147 MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
 148
 149 static char *__initdata iProduct;
 150 module_param(iProduct, charp, S_IRUGO);
 151 MODULE_PARM_DESC(iProduct, "USB Product string");
 152
 153 static char *__initdata iSerialNum;
 154 module_param(iSerialNum, charp, S_IRUGO);
 155 MODULE_PARM_DESC(iSerialNum, "1");
 156
 157 static char *__initdata iPNPstring;
 158 module_param(iPNPstring, charp, S_IRUGO);
 159 MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
 160
 161 /* Number of requests to allocate per endpoint, not used for ep0. */
 162 static unsigned qlen = 10;
 163 module_param(qlen, uint, S_IRUGO|S_IWUSR);
 164
 165 #define QLEN    qlen
 166
 167 #ifdef CONFIG_USB_GADGET_DUALSPEED
 168 #define DEVSPEED        USB_SPEED_HIGH
 169 #else   /* full speed (low speed doesn't do bulk) */
 170 #define DEVSPEED        USB_SPEED_FULL
 171 #endif
 172
 173 /*-------------------------------------------------------------------------*/
 174
 175 #define xprintk(d, level, fmt, args...) \
 176         printk(level "%s: " fmt, DRIVER_DESC, ## args)
 177
 178 #ifdef DEBUG
 179 #define DBG(dev, fmt, args...) \
 180         xprintk(dev, KERN_DEBUG, fmt, ## args)
 181 #else
 182 #define DBG(dev, fmt, args...) \
 183         do { } while (0)
 184 #endif /* DEBUG */
 185
 186 #ifdef VERBOSE
 187 #define VDBG(dev, fmt, args...) \
 188         xprintk(dev, KERN_DEBUG, fmt, ## args)
 189 #else
 190 #define VDBG(dev, fmt, args...) \
 191         do { } while (0)
 192 #endif /* VERBOSE */
 193
 194 #define ERROR(dev, fmt, args...) \
 195         xprintk(dev, KERN_ERR, fmt, ## args)
 196 #define WARNING(dev, fmt, args...) \
 197         xprintk(dev, KERN_WARNING, fmt, ## args)
 198 #define INFO(dev, fmt, args...) \
 199         xprintk(dev, KERN_INFO, fmt, ## args)
 200
 201 /*-------------------------------------------------------------------------*/
 202
 203 /* USB DRIVER HOOKUP (to the hardware driver, below us), mostly
 204  * ep0 implementation:  descriptors, config management, setup().
 205  * also optional class-specific notification interrupt transfer.
 206  */
 207
 208 /*
 209  * DESCRIPTORS ... most are static, but strings and (full) configuration
 210  * descriptors are built on demand.
 211  */
 212
 213 #define STRING_MANUFACTURER             1
 214 #define STRING_PRODUCT                  2
 215 #define STRING_SERIALNUM                3
 216
 217 /* holds our biggest descriptor */
 218 #define USB_DESC_BUFSIZE                256
 219 #define USB_BUFSIZE                     8192
 220
 221 /* This device advertises one configuration. */
 222 #define DEV_CONFIG_VALUE                1
 223 #define PRINTER_INTERFACE               0
 224
 225 static struct usb_device_descriptor device_desc = {
 226         .bLength =              sizeof device_desc,
 227         .bDescriptorType =      USB_DT_DEVICE,
 228         .bcdUSB =               cpu_to_le16(0x0200),
 229         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
 230         .bDeviceSubClass =      0,
 231         .bDeviceProtocol =      0,
 232         .idVendor =             cpu_to_le16(PRINTER_VENDOR_NUM),
 233         .idProduct =            cpu_to_le16(PRINTER_PRODUCT_NUM),
 234         .iManufacturer =        STRING_MANUFACTURER,
 235         .iProduct =             STRING_PRODUCT,
 236         .iSerialNumber =        STRING_SERIALNUM,
 237         .bNumConfigurations =   1
 238 };
 239
 240 static struct usb_otg_descriptor otg_desc = {
 241         .bLength =              sizeof otg_desc,
 242         .bDescriptorType =      USB_DT_OTG,
 243         .bmAttributes =         USB_OTG_SRP
 244 };
 245
 246 static struct usb_config_descriptor config_desc = {
 247         .bLength =              sizeof config_desc,
 248         .bDescriptorType =      USB_DT_CONFIG,
 249
 250         /* compute wTotalLength on the fly */
 251         .bNumInterfaces =       1,
 252         .bConfigurationValue =  DEV_CONFIG_VALUE,
 253         .iConfiguration =       0,
 254         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 255         .bMaxPower =            CONFIG_USB_GADGET_VBUS_DRAW / 2,
 256 };
 257
 258 static struct usb_interface_descriptor intf_desc = {
 259         .bLength =              sizeof intf_desc,
 260         .bDescriptorType =      USB_DT_INTERFACE,
 261         .bInterfaceNumber =     PRINTER_INTERFACE,
 262         .bNumEndpoints =        2,
 263         .bInterfaceClass =      USB_CLASS_PRINTER,
 264         .bInterfaceSubClass =   1,      /* Printer Sub-Class */
 265         .bInterfaceProtocol =   2,      /* Bi-Directional */
 266         .iInterface =           0
 267 };
 268
 269 static struct usb_endpoint_descriptor fs_ep_in_desc = {
 270         .bLength =              USB_DT_ENDPOINT_SIZE,
 271         .bDescriptorType =      USB_DT_ENDPOINT,
 272         .bEndpointAddress =     USB_DIR_IN,
 273         .bmAttributes =         USB_ENDPOINT_XFER_BULK
 274 };
 275
 276 static struct usb_endpoint_descriptor fs_ep_out_desc = {
 277         .bLength =              USB_DT_ENDPOINT_SIZE,
 278         .bDescriptorType =      USB_DT_ENDPOINT,
 279         .bEndpointAddress =     USB_DIR_OUT,
 280         .bmAttributes =         USB_ENDPOINT_XFER_BULK
 281 };
 282
 283 static const struct usb_descriptor_header *fs_printer_function [11] = {
 284         (struct usb_descriptor_header *) &otg_desc,
 285         (struct usb_descriptor_header *) &intf_desc,
 286         (struct usb_descriptor_header *) &fs_ep_in_desc,
 287         (struct usb_descriptor_header *) &fs_ep_out_desc,
 288         NULL
 289 };
 290
 291 #ifdef  CONFIG_USB_GADGET_DUALSPEED
 292
 293 /*
 294  * usb 2.0 devices need to expose both high speed and full speed
 295  * descriptors, unless they only run at full speed.
 296  */
 297
 298 static struct usb_endpoint_descriptor hs_ep_in_desc = {
 299         .bLength =              USB_DT_ENDPOINT_SIZE,
 300         .bDescriptorType =      USB_DT_ENDPOINT,
 301         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 302         .wMaxPacketSize =       cpu_to_le16(512)
 303 };
 304
 305 static struct usb_endpoint_descriptor hs_ep_out_desc = {
 306         .bLength =              USB_DT_ENDPOINT_SIZE,
 307         .bDescriptorType =      USB_DT_ENDPOINT,
 308         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 309         .wMaxPacketSize =       cpu_to_le16(512)
 310 };
 311
 312 static struct usb_qualifier_descriptor dev_qualifier = {
 313         .bLength =              sizeof dev_qualifier,
 314         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
 315         .bcdUSB =               cpu_to_le16(0x0200),
 316         .bDeviceClass =         USB_CLASS_PRINTER,
 317         .bNumConfigurations =   1
 318 };
 319
 320 static const struct usb_descriptor_header *hs_printer_function [11] = {
 321         (struct usb_descriptor_header *) &otg_desc,
 322         (struct usb_descriptor_header *) &intf_desc,
 323         (struct usb_descriptor_header *) &hs_ep_in_desc,
 324         (struct usb_descriptor_header *) &hs_ep_out_desc,
 325         NULL
 326 };
 327
 328 /* maxpacket and other transfer characteristics vary by speed. */
 329 #define ep_desc(g, hs, fs) (((g)->speed == USB_SPEED_HIGH)?(hs):(fs))
 330
 331 #else
 332
 333 /* if there's no high speed support, maxpacket doesn't change. */
 334 #define ep_desc(g, hs, fs) (((void)(g)), (fs))
 335
 336 #endif  /* !CONFIG_USB_GADGET_DUALSPEED */
 337
 338 /*-------------------------------------------------------------------------*/
 339
 340 /* descriptors that are built on-demand */
 341
 342 static char                             manufacturer [50];
 343 static char                             product_desc [40] = DRIVER_DESC;
 344 static char                             serial_num [40] = "1";
 345 static char                             pnp_string [1024] =
 346         "XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
 347
 348 /* static strings, in UTF-8 */
 349 static struct usb_string                strings [] = {
 350         { STRING_MANUFACTURER,  manufacturer, },
 351         { STRING_PRODUCT,       product_desc, },
 352         { STRING_SERIALNUM,     serial_num, },
 353         {  }            /* end of list */
 354 };
 355
 356 static struct usb_gadget_strings        stringtab = {
 357         .language       = 0x0409,       /* en-us */
 358         .strings        = strings,
 359 };
 360
 361 /*-------------------------------------------------------------------------*/
 362
 363 static struct usb_request *
 364 printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
 365 {
 366         struct usb_request      *req;
 367
 368         req = usb_ep_alloc_request(ep, gfp_flags);
 369
 370         if (req != NULL) {
 371                 req->length = len;
 372                 req->buf = kmalloc(len, gfp_flags);
 373                 if (req->buf == NULL) {
 374                         usb_ep_free_request(ep, req);
 375                         return NULL;
 376                 }
 377         }
 378
 379         return req;
 380 }
 381
 382 static void
 383 printer_req_free(struct usb_ep *ep, struct usb_request *req)
 384 {
 385         if (ep != NULL && req != NULL) {
 386                 kfree(req->buf);
 387                 usb_ep_free_request(ep, req);
 388         }
 389 }
 390
 391 /*-------------------------------------------------------------------------*/
 392
 393 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
 394 {
 395         struct printer_dev      *dev = ep->driver_data;
 396         int                     status = req->status;
 397         unsigned long           flags;
 398
 399         spin_lock_irqsave(&dev->lock, flags);
 400
 401         list_del_init(&req->list);      /* Remode from Active List */
 402
 403         switch (status) {
 404
 405         /* normal completion */
 406         case 0:
 407                 if (req->actual > 0) {
 408                         list_add_tail(&req->list, &dev->rx_buffers);
 409                         DBG(dev, "G_Printer : rx length %d\n", req->actual);
 410                 } else {
 411                         list_add(&req->list, &dev->rx_reqs);
 412                 }
 413                 break;
 414
 415         /* software-driven interface shutdown */
 416         case -ECONNRESET:               /* unlink */
 417         case -ESHUTDOWN:                /* disconnect etc */
 418                 VDBG(dev, "rx shutdown, code %d\n", status);
 419                 list_add(&req->list, &dev->rx_reqs);
 420                 break;
 421
 422         /* for hardware automagic (such as pxa) */
 423         case -ECONNABORTED:             /* endpoint reset */
 424                 DBG(dev, "rx %s reset\n", ep->name);
 425                 list_add(&req->list, &dev->rx_reqs);
 426                 break;
 427
 428         /* data overrun */
 429         case -EOVERFLOW:
 430                 /* FALLTHROUGH */
 431
 432         default:
 433                 DBG(dev, "rx status %d\n", status);
 434                 list_add(&req->list, &dev->rx_reqs);
 435                 break;
 436         }
 437
 438         wake_up_interruptible(&dev->rx_wait);
 439         spin_unlock_irqrestore(&dev->lock, flags);
 440 }
 441
 442 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
 443 {
 444         struct printer_dev      *dev = ep->driver_data;
 445
 446         switch (req->status) {
 447         default:
 448                 VDBG(dev, "tx err %d\n", req->status);
 449                 /* FALLTHROUGH */
 450         case -ECONNRESET:               /* unlink */
 451         case -ESHUTDOWN:                /* disconnect etc */
 452                 break;
 453         case 0:
 454                 break;
 455         }
 456
 457         spin_lock(&dev->lock);
 458         /* Take the request struct off the active list and put it on the
 459          * free list.
 460          */
 461         list_del_init(&req->list);
 462         list_add(&req->list, &dev->tx_reqs);
 463         wake_up_interruptible(&dev->tx_wait);
 464         if (likely(list_empty(&dev->tx_reqs_active)))
 465                 wake_up_interruptible(&dev->tx_flush_wait);
 466
 467         spin_unlock(&dev->lock);
 468 }
 469
 470 /*-------------------------------------------------------------------------*/
 471
 472 static int
 473 printer_open(struct inode *inode, struct file *fd)
 474 {
 475         struct printer_dev      *dev;
 476         unsigned long           flags;
 477         int                     ret = -EBUSY;
 478
 479         lock_kernel();
 480         dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
 481
 482         spin_lock_irqsave(&dev->lock, flags);
 483
 484         if (!dev->printer_cdev_open) {
 485                 dev->printer_cdev_open = 1;
 486                 fd->private_data = dev;
 487                 ret = 0;
 488                 /* Change the printer status to show that it's on-line. */
 489                 dev->printer_status |= PRINTER_SELECTED;
 490         }
 491
 492         spin_unlock_irqrestore(&dev->lock, flags);
 493
 494         DBG(dev, "printer_open returned %x\n", ret);
 495         unlock_kernel();
 496         return ret;
 497 }
 498
 499 static int
 500 printer_close(struct inode *inode, struct file *fd)
 501 {
 502         struct printer_dev      *dev = fd->private_data;
 503         unsigned long           flags;
 504
 505         spin_lock_irqsave(&dev->lock, flags);
 506         dev->printer_cdev_open = 0;
 507         fd->private_data = NULL;
 508         /* Change printer status to show that the printer is off-line. */
 509         dev->printer_status &= ~PRINTER_SELECTED;
 510         spin_unlock_irqrestore(&dev->lock, flags);
 511
 512         DBG(dev, "printer_close\n");
 513
 514         return 0;
 515 }
 516
 517 /* This function must be called with interrupts turned off. */
 518 static void
 519 setup_rx_reqs(struct printer_dev *dev)
 520 {
 521         struct usb_request              *req;
 522
 523         while (likely(!list_empty(&dev->rx_reqs))) {
 524                 int error;
 525
 526                 req = container_of(dev->rx_reqs.next,
 527                                 struct usb_request, list);
 528                 list_del_init(&req->list);
 529
 530                 /* The USB Host sends us whatever amount of data it wants to
 531                  * so we always set the length field to the full USB_BUFSIZE.
 532                  * If the amount of data is more than the read() caller asked
 533                  * for it will be stored in the request buffer until it is
 534                  * asked for by read().
 535                  */
 536                 req->length = USB_BUFSIZE;
 537                 req->complete = rx_complete;
 538
 539                 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
 540                 if (error) {
 541                         DBG(dev, "rx submit --> %d\n", error);
 542                         list_add(&req->list, &dev->rx_reqs);
 543                         break;
 544                 } else {
 545                         list_add(&req->list, &dev->rx_reqs_active);
 546                 }
 547         }
 548 }
 549
 550 static ssize_t
 551 printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
 552 {
 553         struct printer_dev              *dev = fd->private_data;
 554         unsigned long                   flags;
 555         size_t                          size;
 556         size_t                          bytes_copied;
 557         struct usb_request              *req;
 558         /* This is a pointer to the current USB rx request. */
 559         struct usb_request              *current_rx_req;
 560         /* This is the number of bytes in the current rx buffer. */
 561         size_t                          current_rx_bytes;
 562         /* This is a pointer to the current rx buffer. */
 563         u8                              *current_rx_buf;
 564
 565         if (len == 0)
 566                 return -EINVAL;
 567
 568         DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
 569
 570         mutex_lock(&dev->lock_printer_io);
 571         spin_lock_irqsave(&dev->lock, flags);
 572
 573         /* We will use this flag later to check if a printer reset happened
 574          * after we turn interrupts back on.
 575          */
 576         dev->reset_printer = 0;
 577
 578         setup_rx_reqs(dev);
 579
 580         bytes_copied = 0;
 581         current_rx_req = dev->current_rx_req;
 582         current_rx_bytes = dev->current_rx_bytes;
 583         current_rx_buf = dev->current_rx_buf;
 584         dev->current_rx_req = NULL;
 585         dev->current_rx_bytes = 0;
 586         dev->current_rx_buf = NULL;
 587
 588         /* Check if there is any data in the read buffers. Please note that
 589          * current_rx_bytes is the number of bytes in the current rx buffer.
 590          * If it is zero then check if there are any other rx_buffers that
 591          * are on the completed list. We are only out of data if all rx
 592          * buffers are empty.
 593          */
 594         if ((current_rx_bytes == 0) &&
 595                         (likely(list_empty(&dev->rx_buffers)))) {
 596                 /* Turn interrupts back on before sleeping. */
 597                 spin_unlock_irqrestore(&dev->lock, flags);
 598
 599                 /*
 600                  * If no data is available check if this is a NON-Blocking
 601                  * call or not.
 602                  */
 603                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 604                         mutex_unlock(&dev->lock_printer_io);
 605                         return -EAGAIN;
 606                 }
 607
 608                 /* Sleep until data is available */
 609                 wait_event_interruptible(dev->rx_wait,
 610                                 (likely(!list_empty(&dev->rx_buffers))));
 611                 spin_lock_irqsave(&dev->lock, flags);
 612         }
 613
 614         /* We have data to return then copy it to the caller's buffer.*/
 615         while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
 616                         && len) {
 617                 if (current_rx_bytes == 0) {
 618                         req = container_of(dev->rx_buffers.next,
 619                                         struct usb_request, list);
 620                         list_del_init(&req->list);
 621
 622                         if (req->actual && req->buf) {
 623                                 current_rx_req = req;
 624                                 current_rx_bytes = req->actual;
 625                                 current_rx_buf = req->buf;
 626                         } else {
 627                                 list_add(&req->list, &dev->rx_reqs);
 628                                 continue;
 629                         }
 630                 }
 631
 632                 /* Don't leave irqs off while doing memory copies */
 633                 spin_unlock_irqrestore(&dev->lock, flags);
 634
 635                 if (len > current_rx_bytes)
 636                         size = current_rx_bytes;
 637                 else
 638                         size = len;
 639
 640                 size -= copy_to_user(buf, current_rx_buf, size);
 641                 bytes_copied += size;
 642                 len -= size;
 643                 buf += size;
 644
 645                 spin_lock_irqsave(&dev->lock, flags);
 646
 647                 /* We've disconnected or reset so return. */
 648                 if (dev->reset_printer) {
 649                         list_add(&current_rx_req->list, &dev->rx_reqs);
 650                         spin_unlock_irqrestore(&dev->lock, flags);
 651                         mutex_unlock(&dev->lock_printer_io);
 652                         return -EAGAIN;
 653                 }
 654
 655                 /* If we not returning all the data left in this RX request
 656                  * buffer then adjust the amount of data left in the buffer.
 657                  * Othewise if we are done with this RX request buffer then
 658                  * requeue it to get any incoming data from the USB host.
 659                  */
 660                 if (size < current_rx_bytes) {
 661                         current_rx_bytes -= size;
 662                         current_rx_buf += size;
 663                 } else {
 664                         list_add(&current_rx_req->list, &dev->rx_reqs);
 665                         current_rx_bytes = 0;
 666                         current_rx_buf = NULL;
 667                         current_rx_req = NULL;
 668                 }
 669         }
 670
 671         dev->current_rx_req = current_rx_req;
 672         dev->current_rx_bytes = current_rx_bytes;
 673         dev->current_rx_buf = current_rx_buf;
 674
 675         spin_unlock_irqrestore(&dev->lock, flags);
 676         mutex_unlock(&dev->lock_printer_io);
 677
 678         DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
 679
 680         if (bytes_copied)
 681                 return bytes_copied;
 682         else
 683                 return -EAGAIN;
 684 }
 685
 686 static ssize_t
 687 printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 688 {
 689         struct printer_dev      *dev = fd->private_data;
 690         unsigned long           flags;
 691         size_t                  size;   /* Amount of data in a TX request. */
 692         size_t                  bytes_copied = 0;
 693         struct usb_request      *req;
 694
 695         DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
 696
 697         if (len == 0)
 698                 return -EINVAL;
 699
 700         mutex_lock(&dev->lock_printer_io);
 701         spin_lock_irqsave(&dev->lock, flags);
 702
 703         /* Check if a printer reset happens while we have interrupts on */
 704         dev->reset_printer = 0;
 705
 706         /* Check if there is any available write buffers */
 707         if (likely(list_empty(&dev->tx_reqs))) {
 708                 /* Turn interrupts back on before sleeping. */
 709                 spin_unlock_irqrestore(&dev->lock, flags);
 710
 711                 /*
 712                  * If write buffers are available check if this is
 713                  * a NON-Blocking call or not.
 714                  */
 715                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 716                         mutex_unlock(&dev->lock_printer_io);
 717                         return -EAGAIN;
 718                 }
 719
 720                 /* Sleep until a write buffer is available */
 721                 wait_event_interruptible(dev->tx_wait,
 722                                 (likely(!list_empty(&dev->tx_reqs))));
 723                 spin_lock_irqsave(&dev->lock, flags);
 724         }
 725
 726         while (likely(!list_empty(&dev->tx_reqs)) && len) {
 727
 728                 if (len > USB_BUFSIZE)
 729                         size = USB_BUFSIZE;
 730                 else
 731                         size = len;
 732
 733                 req = container_of(dev->tx_reqs.next, struct usb_request,
 734                                 list);
 735                 list_del_init(&req->list);
 736
 737                 req->complete = tx_complete;
 738                 req->length = size;
 739
 740                 /* Check if we need to send a zero length packet. */
 741                 if (len > size)
 742                         /* They will be more TX requests so no yet. */
 743                         req->zero = 0;
 744                 else
 745                         /* If the data amount is not a multple of the
 746                          * maxpacket size then send a zero length packet.
 747                          */
 748                         req->zero = ((len % dev->in_ep->maxpacket) == 0);
 749
 750                 /* Don't leave irqs off while doing memory copies */
 751                 spin_unlock_irqrestore(&dev->lock, flags);
 752
 753                 if (copy_from_user(req->buf, buf, size)) {
 754                         list_add(&req->list, &dev->tx_reqs);
 755                         mutex_unlock(&dev->lock_printer_io);
 756                         return bytes_copied;
 757                 }
 758
 759                 bytes_copied += size;
 760                 len -= size;
 761                 buf += size;
 762
 763                 spin_lock_irqsave(&dev->lock, flags);
 764
 765                 /* We've disconnected or reset so free the req and buffer */
 766                 if (dev->reset_printer) {
 767                         list_add(&req->list, &dev->tx_reqs);
 768                         spin_unlock_irqrestore(&dev->lock, flags);
 769                         mutex_unlock(&dev->lock_printer_io);
 770                         return -EAGAIN;
 771                 }
 772
 773                 if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
 774                         list_add(&req->list, &dev->tx_reqs);
 775                         spin_unlock_irqrestore(&dev->lock, flags);
 776                         mutex_unlock(&dev->lock_printer_io);
 777                         return -EAGAIN;
 778                 }
 779
 780                 list_add(&req->list, &dev->tx_reqs_active);
 781
 782         }
 783
 784         spin_unlock_irqrestore(&dev->lock, flags);
 785         mutex_unlock(&dev->lock_printer_io);
 786
 787         DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
 788
 789         if (bytes_copied) {
 790                 return bytes_copied;
 791         } else {
 792                 return -EAGAIN;
 793         }
 794 }
 795
 796 static int
 797 printer_fsync(struct file *fd, int datasync)
 798 {
 799         struct printer_dev      *dev = fd->private_data;
 800         unsigned long           flags;
 801         int                     tx_list_empty;
 802
 803         spin_lock_irqsave(&dev->lock, flags);
 804         tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
 805         spin_unlock_irqrestore(&dev->lock, flags);
 806
 807         if (!tx_list_empty) {
 808                 /* Sleep until all data has been sent */
 809                 wait_event_interruptible(dev->tx_flush_wait,
 810                                 (likely(list_empty(&dev->tx_reqs_active))));
 811         }
 812
 813         return 0;
 814 }
 815
 816 static unsigned int
 817 printer_poll(struct file *fd, poll_table *wait)
 818 {
 819         struct printer_dev      *dev = fd->private_data;
 820         unsigned long           flags;
 821         int                     status = 0;
 822
 823         mutex_lock(&dev->lock_printer_io);
 824         spin_lock_irqsave(&dev->lock, flags);
 825         setup_rx_reqs(dev);
 826         spin_unlock_irqrestore(&dev->lock, flags);
 827         mutex_unlock(&dev->lock_printer_io);
 828
 829         poll_wait(fd, &dev->rx_wait, wait);
 830         poll_wait(fd, &dev->tx_wait, wait);
 831
 832         spin_lock_irqsave(&dev->lock, flags);
 833         if (likely(!list_empty(&dev->tx_reqs)))
 834                 status |= POLLOUT | POLLWRNORM;
 835
 836         if (likely(dev->current_rx_bytes) ||
 837                         likely(!list_empty(&dev->rx_buffers)))
 838                 status |= POLLIN | POLLRDNORM;
 839
 840         spin_unlock_irqrestore(&dev->lock, flags);
 841
 842         return status;
 843 }
 844
 845 static long
 846 printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
 847 {
 848         struct printer_dev      *dev = fd->private_data;
 849         unsigned long           flags;
 850         int                     status = 0;
 851
 852         DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
 853
 854         /* handle ioctls */
 855
 856         spin_lock_irqsave(&dev->lock, flags);
 857
 858         switch (code) {
 859         case GADGET_GET_PRINTER_STATUS:
 860                 status = (int)dev->printer_status;
 861                 break;
 862         case GADGET_SET_PRINTER_STATUS:
 863                 dev->printer_status = (u8)arg;
 864                 break;
 865         default:
 866                 /* could not handle ioctl */
 867                 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
 868                                 code);
 869                 status = -ENOTTY;
 870         }
 871
 872         spin_unlock_irqrestore(&dev->lock, flags);
 873
 874         return status;
 875 }
 876
 877 /* used after endpoint configuration */
 878 static const struct file_operations printer_io_operations = {
 879         .owner =        THIS_MODULE,
 880         .open =         printer_open,
 881         .read =         printer_read,
 882         .write =        printer_write,
 883         .fsync =        printer_fsync,
 884         .poll =         printer_poll,
 885         .unlocked_ioctl = printer_ioctl,
 886         .release =      printer_close
 887 };
 888
 889 /*-------------------------------------------------------------------------*/
 890
 891 static int
 892 set_printer_interface(struct printer_dev *dev)
 893 {
 894         int                     result = 0;
 895
 896         dev->in = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
 897         dev->in_ep->driver_data = dev;
 898
 899         dev->out = ep_desc(dev->gadget, &hs_ep_out_desc, &fs_ep_out_desc);
 900         dev->out_ep->driver_data = dev;
 901
 902         result = usb_ep_enable(dev->in_ep, dev->in);
 903         if (result != 0) {
 904                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 905                 goto done;
 906         }
 907
 908         result = usb_ep_enable(dev->out_ep, dev->out);
 909         if (result != 0) {
 910                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 911                 goto done;
 912         }
 913
 914 done:
 915         /* on error, disable any endpoints  */
 916         if (result != 0) {
 917                 (void) usb_ep_disable(dev->in_ep);
 918                 (void) usb_ep_disable(dev->out_ep);
 919                 dev->in = NULL;
 920                 dev->out = NULL;
 921         }
 922
 923         /* caller is responsible for cleanup on error */
 924         return result;
 925 }
 926
 927 static void printer_reset_interface(struct printer_dev *dev)
 928 {
 929         if (dev->interface < 0)
 930                 return;
 931
 932         DBG(dev, "%s\n", __func__);
 933
 934         if (dev->in)
 935                 usb_ep_disable(dev->in_ep);
 936
 937         if (dev->out)
 938                 usb_ep_disable(dev->out_ep);
 939
 940         dev->interface = -1;
 941 }
 942
 943 /* change our operational config.  must agree with the code
 944  * that returns config descriptors, and altsetting code.
 945  */
 946 static int
 947 printer_set_config(struct printer_dev *dev, unsigned number)
 948 {
 949         int                     result = 0;
 950         struct usb_gadget       *gadget = dev->gadget;
 951
 952         switch (number) {
 953         case DEV_CONFIG_VALUE:
 954                 result = 0;
 955                 break;
 956         default:
 957                 result = -EINVAL;
 958                 /* FALL THROUGH */
 959         case 0:
 960                 break;
 961         }
 962
 963         if (result) {
 964                 usb_gadget_vbus_draw(dev->gadget,
 965                                 dev->gadget->is_otg ? 8 : 100);
 966         } else {
 967                 char *speed;
 968                 unsigned power;
 969
 970                 power = 2 * config_desc.bMaxPower;
 971                 usb_gadget_vbus_draw(dev->gadget, power);
 972
 973                 switch (gadget->speed) {
 974                 case USB_SPEED_FULL:    speed = "full"; break;
 975 #ifdef CONFIG_USB_GADGET_DUALSPEED
 976                 case USB_SPEED_HIGH:    speed = "high"; break;
 977 #endif
 978                 default:                speed = "?"; break;
 979                 }
 980
 981                 dev->config = number;
 982                 INFO(dev, "%s speed config #%d: %d mA, %s\n",
 983                                 speed, number, power, driver_desc);
 984         }
 985         return result;
 986 }
 987
 988 static int
 989 config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index,
 990                 int is_otg)
 991 {
 992         int                                     len;
 993         const struct usb_descriptor_header      **function;
 994 #ifdef CONFIG_USB_GADGET_DUALSPEED
 995         int                                     hs = (speed == USB_SPEED_HIGH);
 996
 997         if (type == USB_DT_OTHER_SPEED_CONFIG)
 998                 hs = !hs;
 999
1000         if (hs) {
1001                 function = hs_printer_function;
1002         } else {
1003                 function = fs_printer_function;
1004         }
1005 #else
1006         function = fs_printer_function;
1007 #endif
1008
1009         if (index >= device_desc.bNumConfigurations)
1010                 return -EINVAL;
1011
1012         /* for now, don't advertise srp-only devices */
1013         if (!is_otg)
1014                 function++;
1015
1016         len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE,
1017                         function);
1018         if (len < 0)
1019                 return len;
1020         ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1021         return len;
1022 }
1023
1024 /* Change our operational Interface. */
1025 static int
1026 set_interface(struct printer_dev *dev, unsigned number)
1027 {
1028         int                     result = 0;
1029
1030         /* Free the current interface */
1031         switch (dev->interface) {
1032         case PRINTER_INTERFACE:
1033                 printer_reset_interface(dev);
1034                 break;
1035         }
1036
1037         switch (number) {
1038         case PRINTER_INTERFACE:
1039                 result = set_printer_interface(dev);
1040                 if (result) {
1041                         printer_reset_interface(dev);
1042                 } else {
1043                         dev->interface = PRINTER_INTERFACE;
1044                 }
1045                 break;
1046         default:
1047                 result = -EINVAL;
1048                 /* FALL THROUGH */
1049         }
1050
1051         if (!result)
1052                 INFO(dev, "Using interface %x\n", number);
1053
1054         return result;
1055 }
1056
1057 static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req)
1058 {
1059         if (req->status || req->actual != req->length)
1060                 DBG((struct printer_dev *) ep->driver_data,
1061                                 "setup complete --> %d, %d/%d\n",
1062                                 req->status, req->actual, req->length);
1063 }
1064
1065 static void printer_soft_reset(struct printer_dev *dev)
1066 {
1067         struct usb_request      *req;
1068
1069         INFO(dev, "Received Printer Reset Request\n");
1070
1071         if (usb_ep_disable(dev->in_ep))
1072                 DBG(dev, "Failed to disable USB in_ep\n");
1073         if (usb_ep_disable(dev->out_ep))
1074                 DBG(dev, "Failed to disable USB out_ep\n");
1075
1076         if (dev->current_rx_req != NULL) {
1077                 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
1078                 dev->current_rx_req = NULL;
1079         }
1080         dev->current_rx_bytes = 0;
1081         dev->current_rx_buf = NULL;
1082         dev->reset_printer = 1;
1083
1084         while (likely(!(list_empty(&dev->rx_buffers)))) {
1085                 req = container_of(dev->rx_buffers.next, struct usb_request,
1086                                 list);
1087                 list_del_init(&req->list);
1088                 list_add(&req->list, &dev->rx_reqs);
1089         }
1090
1091         while (likely(!(list_empty(&dev->rx_reqs_active)))) {
1092                 req = container_of(dev->rx_buffers.next, struct usb_request,
1093                                 list);
1094                 list_del_init(&req->list);
1095                 list_add(&req->list, &dev->rx_reqs);
1096         }
1097
1098         while (likely(!(list_empty(&dev->tx_reqs_active)))) {
1099                 req = container_of(dev->tx_reqs_active.next,
1100                                 struct usb_request, list);
1101                 list_del_init(&req->list);
1102                 list_add(&req->list, &dev->tx_reqs);
1103         }
1104
1105         if (usb_ep_enable(dev->in_ep, dev->in))
1106                 DBG(dev, "Failed to enable USB in_ep\n");
1107         if (usb_ep_enable(dev->out_ep, dev->out))
1108                 DBG(dev, "Failed to enable USB out_ep\n");
1109
1110         wake_up_interruptible(&dev->rx_wait);
1111         wake_up_interruptible(&dev->tx_wait);
1112         wake_up_interruptible(&dev->tx_flush_wait);
1113 }
1114
1115 /*-------------------------------------------------------------------------*/
1116
1117 /*
1118  * The setup() callback implements all the ep0 functionality that's not
1119  * handled lower down.
1120  */
1121 static int
1122 printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1123 {
1124         struct printer_dev      *dev = get_gadget_data(gadget);
1125         struct usb_request      *req = dev->req;
1126         int                     value = -EOPNOTSUPP;
1127         u16                     wIndex = le16_to_cpu(ctrl->wIndex);
1128         u16                     wValue = le16_to_cpu(ctrl->wValue);
1129         u16                     wLength = le16_to_cpu(ctrl->wLength);
1130
1131         DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
1132                 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
1133
1134         req->complete = printer_setup_complete;
1135
1136         switch (ctrl->bRequestType&USB_TYPE_MASK) {
1137
1138         case USB_TYPE_STANDARD:
1139                 switch (ctrl->bRequest) {
1140
1141                 case USB_REQ_GET_DESCRIPTOR:
1142                         if (ctrl->bRequestType != USB_DIR_IN)
1143                                 break;
1144                         switch (wValue >> 8) {
1145
1146                         case USB_DT_DEVICE:
1147                                 value = min(wLength, (u16) sizeof device_desc);
1148                                 memcpy(req->buf, &device_desc, value);
1149                                 break;
1150 #ifdef CONFIG_USB_GADGET_DUALSPEED
1151                         case USB_DT_DEVICE_QUALIFIER:
1152                                 if (!gadget->is_dualspeed)
1153                                         break;
1154                                 value = min(wLength,
1155                                                 (u16) sizeof dev_qualifier);
1156                                 memcpy(req->buf, &dev_qualifier, value);
1157                                 break;
1158
1159                         case USB_DT_OTHER_SPEED_CONFIG:
1160                                 if (!gadget->is_dualspeed)
1161                                         break;
1162                                 /* FALLTHROUGH */
1163 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1164                         case USB_DT_CONFIG:
1165                                 value = config_buf(gadget->speed, req->buf,
1166                                                 wValue >> 8,
1167                                                 wValue & 0xff,
1168                                                 gadget->is_otg);
1169                                 if (value >= 0)
1170                                         value = min(wLength, (u16) value);
1171                                 break;
1172
1173                         case USB_DT_STRING:
1174                                 value = usb_gadget_get_string(&stringtab,
1175                                                 wValue & 0xff, req->buf);
1176                                 if (value >= 0)
1177                                         value = min(wLength, (u16) value);
1178                                 break;
1179                         }
1180                         break;
1181
1182                 case USB_REQ_SET_CONFIGURATION:
1183                         if (ctrl->bRequestType != 0)
1184                                 break;
1185                         if (gadget->a_hnp_support)
1186                                 DBG(dev, "HNP available\n");
1187                         else if (gadget->a_alt_hnp_support)
1188                                 DBG(dev, "HNP needs a different root port\n");
1189                         value = printer_set_config(dev, wValue);
1190                         break;
1191                 case USB_REQ_GET_CONFIGURATION:
1192                         if (ctrl->bRequestType != USB_DIR_IN)
1193                                 break;
1194                         *(u8 *)req->buf = dev->config;
1195                         value = min(wLength, (u16) 1);
1196                         break;
1197
1198                 case USB_REQ_SET_INTERFACE:
1199                         if (ctrl->bRequestType != USB_RECIP_INTERFACE ||
1200                                         !dev->config)
1201                                 break;
1202
1203                         value = set_interface(dev, PRINTER_INTERFACE);
1204                         break;
1205                 case USB_REQ_GET_INTERFACE:
1206                         if (ctrl->bRequestType !=
1207                                         (USB_DIR_IN|USB_RECIP_INTERFACE)
1208                                         || !dev->config)
1209                                 break;
1210
1211                         *(u8 *)req->buf = dev->interface;
1212                         value = min(wLength, (u16) 1);
1213                         break;
1214
1215                 default:
1216                         goto unknown;
1217                 }
1218                 break;
1219
1220         case USB_TYPE_CLASS:
1221                 switch (ctrl->bRequest) {
1222                 case 0: /* Get the IEEE-1284 PNP String */
1223                         /* Only one printer interface is supported. */
1224                         if ((wIndex>>8) != PRINTER_INTERFACE)
1225                                 break;
1226
1227                         value = (pnp_string[0]<<8)|pnp_string[1];
1228                         memcpy(req->buf, pnp_string, value);
1229                         DBG(dev, "1284 PNP String: %x %s\n", value,
1230                                         &pnp_string[2]);
1231                         break;
1232
1233                 case 1: /* Get Port Status */
1234                         /* Only one printer interface is supported. */
1235                         if (wIndex != PRINTER_INTERFACE)
1236                                 break;
1237
1238                         *(u8 *)req->buf = dev->printer_status;
1239                         value = min(wLength, (u16) 1);
1240                         break;
1241
1242                 case 2: /* Soft Reset */
1243                         /* Only one printer interface is supported. */
1244                         if (wIndex != PRINTER_INTERFACE)
1245                                 break;
1246
1247                         printer_soft_reset(dev);
1248
1249                         value = 0;
1250                         break;
1251
1252                 default:
1253                         goto unknown;
1254                 }
1255                 break;
1256
1257         default:
1258 unknown:
1259                 VDBG(dev,
1260                         "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1261                         ctrl->bRequestType, ctrl->bRequest,
1262                         wValue, wIndex, wLength);
1263                 break;
1264         }
1265
1266         /* respond with data transfer before status phase? */
1267         if (value >= 0) {
1268                 req->length = value;
1269                 req->zero = value < wLength;
1270                 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1271                 if (value < 0) {
1272                         DBG(dev, "ep_queue --> %d\n", value);
1273                         req->status = 0;
1274                         printer_setup_complete(gadget->ep0, req);
1275                 }
1276         }
1277
1278         /* host either stalls (value < 0) or reports success */
1279         return value;
1280 }
1281
1282 static void
1283 printer_disconnect(struct usb_gadget *gadget)
1284 {
1285         struct printer_dev      *dev = get_gadget_data(gadget);
1286         unsigned long           flags;
1287
1288         DBG(dev, "%s\n", __func__);
1289
1290         spin_lock_irqsave(&dev->lock, flags);
1291
1292         printer_reset_interface(dev);
1293
1294         spin_unlock_irqrestore(&dev->lock, flags);
1295 }
1296
1297 static void
1298 printer_unbind(struct usb_gadget *gadget)
1299 {
1300         struct printer_dev      *dev = get_gadget_data(gadget);
1301         struct usb_request      *req;
1302
1303
1304         DBG(dev, "%s\n", __func__);
1305
1306         /* Remove sysfs files */
1307         device_destroy(usb_gadget_class, g_printer_devno);
1308
1309         /* Remove Character Device */
1310         cdev_del(&dev->printer_cdev);
1311
1312         /* we must already have been disconnected ... no i/o may be active */
1313         WARN_ON(!list_empty(&dev->tx_reqs_active));
1314         WARN_ON(!list_empty(&dev->rx_reqs_active));
1315
1316         /* Free all memory for this driver. */
1317         while (!list_empty(&dev->tx_reqs)) {
1318                 req = container_of(dev->tx_reqs.next, struct usb_request,
1319                                 list);
1320                 list_del(&req->list);
1321                 printer_req_free(dev->in_ep, req);
1322         }
1323
1324         if (dev->current_rx_req != NULL)
1325                 printer_req_free(dev->out_ep, dev->current_rx_req);
1326
1327         while (!list_empty(&dev->rx_reqs)) {
1328                 req = container_of(dev->rx_reqs.next,
1329                                 struct usb_request, list);
1330                 list_del(&req->list);
1331                 printer_req_free(dev->out_ep, req);
1332         }
1333
1334         while (!list_empty(&dev->rx_buffers)) {
1335                 req = container_of(dev->rx_buffers.next,
1336                                 struct usb_request, list);
1337                 list_del(&req->list);
1338                 printer_req_free(dev->out_ep, req);
1339         }
1340
1341         if (dev->req) {
1342                 printer_req_free(gadget->ep0, dev->req);
1343                 dev->req = NULL;
1344         }
1345
1346         set_gadget_data(gadget, NULL);
1347 }
1348
1349 static int __init
1350 printer_bind(struct usb_gadget *gadget)
1351 {
1352         struct printer_dev      *dev;
1353         struct usb_ep           *in_ep, *out_ep;
1354         int                     status = -ENOMEM;
1355         int                     gcnum;
1356         size_t                  len;
1357         u32                     i;
1358         struct usb_request      *req;
1359
1360         dev = &usb_printer_gadget;
1361
1362
1363         /* Setup the sysfs files for the printer gadget. */
1364         dev->pdev = device_create(usb_gadget_class, NULL, g_printer_devno,
1365                                   NULL, "g_printer");
1366         if (IS_ERR(dev->pdev)) {
1367                 ERROR(dev, "Failed to create device: g_printer\n");
1368                 goto fail;
1369         }
1370
1371         /*
1372          * Register a character device as an interface to a user mode
1373          * program that handles the printer specific functionality.
1374          */
1375         cdev_init(&dev->printer_cdev, &printer_io_operations);
1376         dev->printer_cdev.owner = THIS_MODULE;
1377         status = cdev_add(&dev->printer_cdev, g_printer_devno, 1);
1378         if (status) {
1379                 ERROR(dev, "Failed to open char device\n");
1380                 goto fail;
1381         }
1382
1383         gcnum = usb_gadget_controller_number(gadget);
1384         if (gcnum >= 0) {
1385                 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
1386         } else {
1387                 dev_warn(&gadget->dev, "controller '%s' not recognized\n",
1388                         gadget->name);
1389                 /* unrecognized, but safe unless bulk is REALLY quirky */
1390                 device_desc.bcdDevice =
1391                         cpu_to_le16(0xFFFF);
1392         }
1393         snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1394                 init_utsname()->sysname, init_utsname()->release,
1395                 gadget->name);
1396
1397         device_desc.idVendor =
1398                 cpu_to_le16(PRINTER_VENDOR_NUM);
1399         device_desc.idProduct =
1400                 cpu_to_le16(PRINTER_PRODUCT_NUM);
1401
1402         /* support optional vendor/distro customization */
1403         if (idVendor) {
1404                 if (!idProduct) {
1405                         dev_err(&gadget->dev, "idVendor needs idProduct!\n");
1406                         return -ENODEV;
1407                 }
1408                 device_desc.idVendor = cpu_to_le16(idVendor);
1409                 device_desc.idProduct = cpu_to_le16(idProduct);
1410                 if (bcdDevice)
1411                         device_desc.bcdDevice = cpu_to_le16(bcdDevice);
1412         }
1413
1414         if (iManufacturer)
1415                 strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
1416
1417         if (iProduct)
1418                 strlcpy(product_desc, iProduct, sizeof product_desc);
1419
1420         if (iSerialNum)
1421                 strlcpy(serial_num, iSerialNum, sizeof serial_num);
1422
1423         if (iPNPstring)
1424                 strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2);
1425
1426         len = strlen(pnp_string);
1427         pnp_string[0] = (len >> 8) & 0xFF;
1428         pnp_string[1] = len & 0xFF;
1429
1430         /* all we really need is bulk IN/OUT */
1431         usb_ep_autoconfig_reset(gadget);
1432         in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc);
1433         if (!in_ep) {
1434 autoconf_fail:
1435                 dev_err(&gadget->dev, "can't autoconfigure on %s\n",
1436                         gadget->name);
1437                 return -ENODEV;
1438         }
1439         in_ep->driver_data = in_ep;     /* claim */
1440
1441         out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc);
1442         if (!out_ep)
1443                 goto autoconf_fail;
1444         out_ep->driver_data = out_ep;   /* claim */
1445
1446 #ifdef  CONFIG_USB_GADGET_DUALSPEED
1447         /* assumes ep0 uses the same value for both speeds ... */
1448         dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
1449
1450         /* and that all endpoints are dual-speed */
1451         hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1452         hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1453 #endif  /* DUALSPEED */
1454
1455         device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1456         usb_gadget_set_selfpowered(gadget);
1457
1458         if (gadget->is_otg) {
1459                 otg_desc.bmAttributes |= USB_OTG_HNP,
1460                 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1461         }
1462
1463         spin_lock_init(&dev->lock);
1464         mutex_init(&dev->lock_printer_io);
1465         INIT_LIST_HEAD(&dev->tx_reqs);
1466         INIT_LIST_HEAD(&dev->tx_reqs_active);
1467         INIT_LIST_HEAD(&dev->rx_reqs);
1468         INIT_LIST_HEAD(&dev->rx_reqs_active);
1469         INIT_LIST_HEAD(&dev->rx_buffers);
1470         init_waitqueue_head(&dev->rx_wait);
1471         init_waitqueue_head(&dev->tx_wait);
1472         init_waitqueue_head(&dev->tx_flush_wait);
1473
1474         dev->config = 0;
1475         dev->interface = -1;
1476         dev->printer_cdev_open = 0;
1477         dev->printer_status = PRINTER_NOT_ERROR;
1478         dev->current_rx_req = NULL;
1479         dev->current_rx_bytes = 0;
1480         dev->current_rx_buf = NULL;
1481
1482         dev->in_ep = in_ep;
1483         dev->out_ep = out_ep;
1484
1485         /* preallocate control message data and buffer */
1486         dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE,
1487                         GFP_KERNEL);
1488         if (!dev->req) {
1489                 status = -ENOMEM;
1490                 goto fail;
1491         }
1492
1493         for (i = 0; i < QLEN; i++) {
1494                 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1495                 if (!req) {
1496                         while (!list_empty(&dev->tx_reqs)) {
1497                                 req = container_of(dev->tx_reqs.next,
1498                                                 struct usb_request, list);
1499                                 list_del(&req->list);
1500                                 printer_req_free(dev->in_ep, req);
1501                         }
1502                         return -ENOMEM;
1503                 }
1504                 list_add(&req->list, &dev->tx_reqs);
1505         }
1506
1507         for (i = 0; i < QLEN; i++) {
1508                 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1509                 if (!req) {
1510                         while (!list_empty(&dev->rx_reqs)) {
1511                                 req = container_of(dev->rx_reqs.next,
1512                                                 struct usb_request, list);
1513                                 list_del(&req->list);
1514                                 printer_req_free(dev->out_ep, req);
1515                         }
1516                         return -ENOMEM;
1517                 }
1518                 list_add(&req->list, &dev->rx_reqs);
1519         }
1520
1521         dev->req->complete = printer_setup_complete;
1522
1523         /* finish hookup to lower layer ... */
1524         dev->gadget = gadget;
1525         set_gadget_data(gadget, dev);
1526         gadget->ep0->driver_data = dev;
1527
1528         INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
1529         INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name,
1530                         in_ep->name);
1531
1532         return 0;
1533
1534 fail:
1535         printer_unbind(gadget);
1536         return status;
1537 }
1538
1539 /*-------------------------------------------------------------------------*/
1540
1541 static struct usb_gadget_driver printer_driver = {
1542         .speed          = DEVSPEED,
1543
1544         .function       = (char *) driver_desc,
1545         .bind           = printer_bind,
1546         .unbind         = printer_unbind,
1547
1548         .setup          = printer_setup,
1549         .disconnect     = printer_disconnect,
1550
1551         .driver         = {
1552                 .name           = (char *) shortname,
1553                 .owner          = THIS_MODULE,
1554         },
1555 };
1556
1557 MODULE_DESCRIPTION(DRIVER_DESC);
1558 MODULE_AUTHOR("Craig Nadler");
1559 MODULE_LICENSE("GPL");
1560
1561 static int __init
1562 init(void)
1563 {
1564         int status;
1565
1566         usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1567         if (IS_ERR(usb_gadget_class)) {
1568                 status = PTR_ERR(usb_gadget_class);
1569                 ERROR(dev, "unable to create usb_gadget class %d\n", status);
1570                 return status;
1571         }
1572
1573         status = alloc_chrdev_region(&g_printer_devno, 0, 1,
1574                         "USB printer gadget");
1575         if (status) {
1576                 ERROR(dev, "alloc_chrdev_region %d\n", status);
1577                 class_destroy(usb_gadget_class);
1578                 return status;
1579         }
1580
1581         status = usb_gadget_register_driver(&printer_driver);
1582         if (status) {
1583                 class_destroy(usb_gadget_class);
1584                 unregister_chrdev_region(g_printer_devno, 1);
1585                 DBG(dev, "usb_gadget_register_driver %x\n", status);
1586         }
1587
1588         return status;
1589 }
1590 module_init(init);
1591
1592 static void __exit
1593 cleanup(void)
1594 {
1595         int status;
1596
1597         mutex_lock(&usb_printer_gadget.lock_printer_io);
1598         class_destroy(usb_gadget_class);
1599         unregister_chrdev_region(g_printer_devno, 2);
1600
1601         status = usb_gadget_unregister_driver(&printer_driver);
1602         if (status)
1603                 ERROR(dev, "usb_gadget_unregister_driver %x\n", status);
1604
1605         mutex_unlock(&usb_printer_gadget.lock_printer_io);
1606 }
1607 module_exit(cleanup);