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