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/mutex.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 DEFINE_MUTEX(printer_mutex);
  74 static const char shortname [] = "printer";
  75 static const char driver_desc [] = DRIVER_DESC;
  76
  77 static dev_t g_printer_devno;
  78
  79 static struct class *usb_gadget_class;
  80
  81 /*-------------------------------------------------------------------------*/
  82
  83 struct printer_dev {
  84         spinlock_t              lock;           /* lock this structure */
  85         /* lock buffer lists during read/write calls */
  86         struct mutex            lock_printer_io;
  87         struct usb_gadget       *gadget;
  88         struct usb_request      *req;           /* for control responses */
  89         u8                      config;
  90         s8                      interface;
  91         struct usb_ep           *in_ep, *out_ep;
  92
  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 identifiers 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 idVendor;
 134 module_param(idVendor, ushort, S_IRUGO);
 135 MODULE_PARM_DESC(idVendor, "USB Vendor ID");
 136
 137 static ushort idProduct;
 138 module_param(idProduct, ushort, S_IRUGO);
 139 MODULE_PARM_DESC(idProduct, "USB Product ID");
 140
 141 static ushort bcdDevice;
 142 module_param(bcdDevice, ushort, S_IRUGO);
 143 MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
 144
 145 static char *iManufacturer;
 146 module_param(iManufacturer, charp, S_IRUGO);
 147 MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
 148
 149 static char *iProduct;
 150 module_param(iProduct, charp, S_IRUGO);
 151 MODULE_PARM_DESC(iProduct, "USB Product string");
 152
 153 static char *iSerialNum;
 154 module_param(iSerialNum, charp, S_IRUGO);
 155 MODULE_PARM_DESC(iSerialNum, "1");
 156
 157 static char *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         mutex_lock(&printer_mutex);
 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         mutex_unlock(&printer_mutex);
 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, loff_t start, loff_t end, int datasync)
 798 {
 799         struct printer_dev      *dev = fd->private_data;
 800         struct inode *inode = fd->f_path.dentry->d_inode;
 801         unsigned long           flags;
 802         int                     tx_list_empty;
 803
 804         mutex_lock(&inode->i_mutex);
 805         spin_lock_irqsave(&dev->lock, flags);
 806         tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
 807         spin_unlock_irqrestore(&dev->lock, flags);
 808
 809         if (!tx_list_empty) {
 810                 /* Sleep until all data has been sent */
 811                 wait_event_interruptible(dev->tx_flush_wait,
 812                                 (likely(list_empty(&dev->tx_reqs_active))));
 813         }
 814         mutex_unlock(&inode->i_mutex);
 815
 816         return 0;
 817 }
 818
 819 static unsigned int
 820 printer_poll(struct file *fd, poll_table *wait)
 821 {
 822         struct printer_dev      *dev = fd->private_data;
 823         unsigned long           flags;
 824         int                     status = 0;
 825
 826         mutex_lock(&dev->lock_printer_io);
 827         spin_lock_irqsave(&dev->lock, flags);
 828         setup_rx_reqs(dev);
 829         spin_unlock_irqrestore(&dev->lock, flags);
 830         mutex_unlock(&dev->lock_printer_io);
 831
 832         poll_wait(fd, &dev->rx_wait, wait);
 833         poll_wait(fd, &dev->tx_wait, wait);
 834
 835         spin_lock_irqsave(&dev->lock, flags);
 836         if (likely(!list_empty(&dev->tx_reqs)))
 837                 status |= POLLOUT | POLLWRNORM;
 838
 839         if (likely(dev->current_rx_bytes) ||
 840                         likely(!list_empty(&dev->rx_buffers)))
 841                 status |= POLLIN | POLLRDNORM;
 842
 843         spin_unlock_irqrestore(&dev->lock, flags);
 844
 845         return status;
 846 }
 847
 848 static long
 849 printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
 850 {
 851         struct printer_dev      *dev = fd->private_data;
 852         unsigned long           flags;
 853         int                     status = 0;
 854
 855         DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
 856
 857         /* handle ioctls */
 858
 859         spin_lock_irqsave(&dev->lock, flags);
 860
 861         switch (code) {
 862         case GADGET_GET_PRINTER_STATUS:
 863                 status = (int)dev->printer_status;
 864                 break;
 865         case GADGET_SET_PRINTER_STATUS:
 866                 dev->printer_status = (u8)arg;
 867                 break;
 868         default:
 869                 /* could not handle ioctl */
 870                 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
 871                                 code);
 872                 status = -ENOTTY;
 873         }
 874
 875         spin_unlock_irqrestore(&dev->lock, flags);
 876
 877         return status;
 878 }
 879
 880 /* used after endpoint configuration */
 881 static const struct file_operations printer_io_operations = {
 882         .owner =        THIS_MODULE,
 883         .open =         printer_open,
 884         .read =         printer_read,
 885         .write =        printer_write,
 886         .fsync =        printer_fsync,
 887         .poll =         printer_poll,
 888         .unlocked_ioctl = printer_ioctl,
 889         .release =      printer_close,
 890         .llseek =       noop_llseek,
 891 };
 892
 893 /*-------------------------------------------------------------------------*/
 894
 895 static int
 896 set_printer_interface(struct printer_dev *dev)
 897 {
 898         int                     result = 0;
 899
 900         dev->in_ep->desc = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
 901         dev->in_ep->driver_data = dev;
 902
 903         dev->out_ep->desc = ep_desc(dev->gadget, &hs_ep_out_desc,
 904                                     &fs_ep_out_desc);
 905         dev->out_ep->driver_data = dev;
 906
 907         result = usb_ep_enable(dev->in_ep);
 908         if (result != 0) {
 909                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 910                 goto done;
 911         }
 912
 913         result = usb_ep_enable(dev->out_ep);
 914         if (result != 0) {
 915                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 916                 goto done;
 917         }
 918
 919 done:
 920         /* on error, disable any endpoints  */
 921         if (result != 0) {
 922                 (void) usb_ep_disable(dev->in_ep);
 923                 (void) usb_ep_disable(dev->out_ep);
 924                 dev->in_ep->desc = NULL;
 925                 dev->out_ep->desc = NULL;
 926         }
 927
 928         /* caller is responsible for cleanup on error */
 929         return result;
 930 }
 931
 932 static void printer_reset_interface(struct printer_dev *dev)
 933 {
 934         if (dev->interface < 0)
 935                 return;
 936
 937         DBG(dev, "%s\n", __func__);
 938
 939         if (dev->in_ep->desc)
 940                 usb_ep_disable(dev->in_ep);
 941
 942         if (dev->out_ep->desc)
 943                 usb_ep_disable(dev->out_ep);
 944
 945         dev->in_ep->desc = NULL;
 946         dev->out_ep->desc = NULL;
 947         dev->interface = -1;
 948 }
 949
 950 /* change our operational config.  must agree with the code
 951  * that returns config descriptors, and altsetting code.
 952  */
 953 static int
 954 printer_set_config(struct printer_dev *dev, unsigned number)
 955 {
 956         int                     result = 0;
 957         struct usb_gadget       *gadget = dev->gadget;
 958
 959         switch (number) {
 960         case DEV_CONFIG_VALUE:
 961                 result = 0;
 962                 break;
 963         default:
 964                 result = -EINVAL;
 965                 /* FALL THROUGH */
 966         case 0:
 967                 break;
 968         }
 969
 970         if (result) {
 971                 usb_gadget_vbus_draw(dev->gadget,
 972                                 dev->gadget->is_otg ? 8 : 100);
 973         } else {
 974                 char *speed;
 975                 unsigned power;
 976
 977                 power = 2 * config_desc.bMaxPower;
 978                 usb_gadget_vbus_draw(dev->gadget, power);
 979
 980                 switch (gadget->speed) {
 981                 case USB_SPEED_FULL:    speed = "full"; break;
 982 #ifdef CONFIG_USB_GADGET_DUALSPEED
 983                 case USB_SPEED_HIGH:    speed = "high"; break;
 984 #endif
 985                 default:                speed = "?"; break;
 986                 }
 987
 988                 dev->config = number;
 989                 INFO(dev, "%s speed config #%d: %d mA, %s\n",
 990                                 speed, number, power, driver_desc);
 991         }
 992         return result;
 993 }
 994
 995 static int
 996 config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index,
 997                 int is_otg)
 998 {
 999         int                                     len;
1000         const struct usb_descriptor_header      **function;
1001 #ifdef CONFIG_USB_GADGET_DUALSPEED
1002         int                                     hs = (speed == USB_SPEED_HIGH);
1003
1004         if (type == USB_DT_OTHER_SPEED_CONFIG)
1005                 hs = !hs;
1006
1007         if (hs) {
1008                 function = hs_printer_function;
1009         } else {
1010                 function = fs_printer_function;
1011         }
1012 #else
1013         function = fs_printer_function;
1014 #endif
1015
1016         if (index >= device_desc.bNumConfigurations)
1017                 return -EINVAL;
1018
1019         /* for now, don't advertise srp-only devices */
1020         if (!is_otg)
1021                 function++;
1022
1023         len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE,
1024                         function);
1025         if (len < 0)
1026                 return len;
1027         ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1028         return len;
1029 }
1030
1031 /* Change our operational Interface. */
1032 static int
1033 set_interface(struct printer_dev *dev, unsigned number)
1034 {
1035         int                     result = 0;
1036
1037         /* Free the current interface */
1038         switch (dev->interface) {
1039         case PRINTER_INTERFACE:
1040                 printer_reset_interface(dev);
1041                 break;
1042         }
1043
1044         switch (number) {
1045         case PRINTER_INTERFACE:
1046                 result = set_printer_interface(dev);
1047                 if (result) {
1048                         printer_reset_interface(dev);
1049                 } else {
1050                         dev->interface = PRINTER_INTERFACE;
1051                 }
1052                 break;
1053         default:
1054                 result = -EINVAL;
1055                 /* FALL THROUGH */
1056         }
1057
1058         if (!result)
1059                 INFO(dev, "Using interface %x\n", number);
1060
1061         return result;
1062 }
1063
1064 static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req)
1065 {
1066         if (req->status || req->actual != req->length)
1067                 DBG((struct printer_dev *) ep->driver_data,
1068                                 "setup complete --> %d, %d/%d\n",
1069                                 req->status, req->actual, req->length);
1070 }
1071
1072 static void printer_soft_reset(struct printer_dev *dev)
1073 {
1074         struct usb_request      *req;
1075
1076         INFO(dev, "Received Printer Reset Request\n");
1077
1078         if (usb_ep_disable(dev->in_ep))
1079                 DBG(dev, "Failed to disable USB in_ep\n");
1080         if (usb_ep_disable(dev->out_ep))
1081                 DBG(dev, "Failed to disable USB out_ep\n");
1082
1083         if (dev->current_rx_req != NULL) {
1084                 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
1085                 dev->current_rx_req = NULL;
1086         }
1087         dev->current_rx_bytes = 0;
1088         dev->current_rx_buf = NULL;
1089         dev->reset_printer = 1;
1090
1091         while (likely(!(list_empty(&dev->rx_buffers)))) {
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->rx_reqs_active)))) {
1099                 req = container_of(dev->rx_buffers.next, struct usb_request,
1100                                 list);
1101                 list_del_init(&req->list);
1102                 list_add(&req->list, &dev->rx_reqs);
1103         }
1104
1105         while (likely(!(list_empty(&dev->tx_reqs_active)))) {
1106                 req = container_of(dev->tx_reqs_active.next,
1107                                 struct usb_request, list);
1108                 list_del_init(&req->list);
1109                 list_add(&req->list, &dev->tx_reqs);
1110         }
1111
1112         if (usb_ep_enable(dev->in_ep))
1113                 DBG(dev, "Failed to enable USB in_ep\n");
1114         if (usb_ep_enable(dev->out_ep))
1115                 DBG(dev, "Failed to enable USB out_ep\n");
1116
1117         wake_up_interruptible(&dev->rx_wait);
1118         wake_up_interruptible(&dev->tx_wait);
1119         wake_up_interruptible(&dev->tx_flush_wait);
1120 }
1121
1122 /*-------------------------------------------------------------------------*/
1123
1124 /*
1125  * The setup() callback implements all the ep0 functionality that's not
1126  * handled lower down.
1127  */
1128 static int
1129 printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1130 {
1131         struct printer_dev      *dev = get_gadget_data(gadget);
1132         struct usb_request      *req = dev->req;
1133         int                     value = -EOPNOTSUPP;
1134         u16                     wIndex = le16_to_cpu(ctrl->wIndex);
1135         u16                     wValue = le16_to_cpu(ctrl->wValue);
1136         u16                     wLength = le16_to_cpu(ctrl->wLength);
1137
1138         DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
1139                 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
1140
1141         req->complete = printer_setup_complete;
1142
1143         switch (ctrl->bRequestType&USB_TYPE_MASK) {
1144
1145         case USB_TYPE_STANDARD:
1146                 switch (ctrl->bRequest) {
1147
1148                 case USB_REQ_GET_DESCRIPTOR:
1149                         if (ctrl->bRequestType != USB_DIR_IN)
1150                                 break;
1151                         switch (wValue >> 8) {
1152
1153                         case USB_DT_DEVICE:
1154                                 device_desc.bMaxPacketSize0 =
1155                                         gadget->ep0->maxpacket;
1156                                 value = min(wLength, (u16) sizeof device_desc);
1157                                 memcpy(req->buf, &device_desc, value);
1158                                 break;
1159 #ifdef CONFIG_USB_GADGET_DUALSPEED
1160                         case USB_DT_DEVICE_QUALIFIER:
1161                                 if (!gadget->is_dualspeed)
1162                                         break;
1163                                 /*
1164                                  * assumes ep0 uses the same value for both
1165                                  * speeds
1166                                  */
1167                                 dev_qualifier.bMaxPacketSize0 =
1168                                         gadget->ep0->maxpacket;
1169                                 value = min(wLength,
1170                                                 (u16) sizeof dev_qualifier);
1171                                 memcpy(req->buf, &dev_qualifier, value);
1172                                 break;
1173
1174                         case USB_DT_OTHER_SPEED_CONFIG:
1175                                 if (!gadget->is_dualspeed)
1176                                         break;
1177                                 /* FALLTHROUGH */
1178 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1179                         case USB_DT_CONFIG:
1180                                 value = config_buf(gadget->speed, req->buf,
1181                                                 wValue >> 8,
1182                                                 wValue & 0xff,
1183                                                 gadget->is_otg);
1184                                 if (value >= 0)
1185                                         value = min(wLength, (u16) value);
1186                                 break;
1187
1188                         case USB_DT_STRING:
1189                                 value = usb_gadget_get_string(&stringtab,
1190                                                 wValue & 0xff, req->buf);
1191                                 if (value >= 0)
1192                                         value = min(wLength, (u16) value);
1193                                 break;
1194                         }
1195                         break;
1196
1197                 case USB_REQ_SET_CONFIGURATION:
1198                         if (ctrl->bRequestType != 0)
1199                                 break;
1200                         if (gadget->a_hnp_support)
1201                                 DBG(dev, "HNP available\n");
1202                         else if (gadget->a_alt_hnp_support)
1203                                 DBG(dev, "HNP needs a different root port\n");
1204                         value = printer_set_config(dev, wValue);
1205                         if (!value)
1206                                 value = set_interface(dev, PRINTER_INTERFACE);
1207                         break;
1208                 case USB_REQ_GET_CONFIGURATION:
1209                         if (ctrl->bRequestType != USB_DIR_IN)
1210                                 break;
1211                         *(u8 *)req->buf = dev->config;
1212                         value = min(wLength, (u16) 1);
1213                         break;
1214
1215                 case USB_REQ_SET_INTERFACE:
1216                         if (ctrl->bRequestType != USB_RECIP_INTERFACE ||
1217                                         !dev->config)
1218                                 break;
1219
1220                         value = set_interface(dev, PRINTER_INTERFACE);
1221                         break;
1222                 case USB_REQ_GET_INTERFACE:
1223                         if (ctrl->bRequestType !=
1224                                         (USB_DIR_IN|USB_RECIP_INTERFACE)
1225                                         || !dev->config)
1226                                 break;
1227
1228                         *(u8 *)req->buf = dev->interface;
1229                         value = min(wLength, (u16) 1);
1230                         break;
1231
1232                 default:
1233                         goto unknown;
1234                 }
1235                 break;
1236
1237         case USB_TYPE_CLASS:
1238                 switch (ctrl->bRequest) {
1239                 case 0: /* Get the IEEE-1284 PNP String */
1240                         /* Only one printer interface is supported. */
1241                         if ((wIndex>>8) != PRINTER_INTERFACE)
1242                                 break;
1243
1244                         value = (pnp_string[0]<<8)|pnp_string[1];
1245                         memcpy(req->buf, pnp_string, value);
1246                         DBG(dev, "1284 PNP String: %x %s\n", value,
1247                                         &pnp_string[2]);
1248                         break;
1249
1250                 case 1: /* Get Port Status */
1251                         /* Only one printer interface is supported. */
1252                         if (wIndex != PRINTER_INTERFACE)
1253                                 break;
1254
1255                         *(u8 *)req->buf = dev->printer_status;
1256                         value = min(wLength, (u16) 1);
1257                         break;
1258
1259                 case 2: /* Soft Reset */
1260                         /* Only one printer interface is supported. */
1261                         if (wIndex != PRINTER_INTERFACE)
1262                                 break;
1263
1264                         printer_soft_reset(dev);
1265
1266                         value = 0;
1267                         break;
1268
1269                 default:
1270                         goto unknown;
1271                 }
1272                 break;
1273
1274         default:
1275 unknown:
1276                 VDBG(dev,
1277                         "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1278                         ctrl->bRequestType, ctrl->bRequest,
1279                         wValue, wIndex, wLength);
1280                 break;
1281         }
1282
1283         /* respond with data transfer before status phase? */
1284         if (value >= 0) {
1285                 req->length = value;
1286                 req->zero = value < wLength;
1287                 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1288                 if (value < 0) {
1289                         DBG(dev, "ep_queue --> %d\n", value);
1290                         req->status = 0;
1291                         printer_setup_complete(gadget->ep0, req);
1292                 }
1293         }
1294
1295         /* host either stalls (value < 0) or reports success */
1296         return value;
1297 }
1298
1299 static void
1300 printer_disconnect(struct usb_gadget *gadget)
1301 {
1302         struct printer_dev      *dev = get_gadget_data(gadget);
1303         unsigned long           flags;
1304
1305         DBG(dev, "%s\n", __func__);
1306
1307         spin_lock_irqsave(&dev->lock, flags);
1308
1309         printer_reset_interface(dev);
1310
1311         spin_unlock_irqrestore(&dev->lock, flags);
1312 }
1313
1314 static void
1315 printer_unbind(struct usb_gadget *gadget)
1316 {
1317         struct printer_dev      *dev = get_gadget_data(gadget);
1318         struct usb_request      *req;
1319
1320
1321         DBG(dev, "%s\n", __func__);
1322
1323         /* Remove sysfs files */
1324         device_destroy(usb_gadget_class, g_printer_devno);
1325
1326         /* Remove Character Device */
1327         cdev_del(&dev->printer_cdev);
1328
1329         /* we must already have been disconnected ... no i/o may be active */
1330         WARN_ON(!list_empty(&dev->tx_reqs_active));
1331         WARN_ON(!list_empty(&dev->rx_reqs_active));
1332
1333         /* Free all memory for this driver. */
1334         while (!list_empty(&dev->tx_reqs)) {
1335                 req = container_of(dev->tx_reqs.next, struct usb_request,
1336                                 list);
1337                 list_del(&req->list);
1338                 printer_req_free(dev->in_ep, req);
1339         }
1340
1341         if (dev->current_rx_req != NULL)
1342                 printer_req_free(dev->out_ep, dev->current_rx_req);
1343
1344         while (!list_empty(&dev->rx_reqs)) {
1345                 req = container_of(dev->rx_reqs.next,
1346                                 struct usb_request, list);
1347                 list_del(&req->list);
1348                 printer_req_free(dev->out_ep, req);
1349         }
1350
1351         while (!list_empty(&dev->rx_buffers)) {
1352                 req = container_of(dev->rx_buffers.next,
1353                                 struct usb_request, list);
1354                 list_del(&req->list);
1355                 printer_req_free(dev->out_ep, req);
1356         }
1357
1358         if (dev->req) {
1359                 printer_req_free(gadget->ep0, dev->req);
1360                 dev->req = NULL;
1361         }
1362
1363         set_gadget_data(gadget, NULL);
1364 }
1365
1366 static int __init
1367 printer_bind(struct usb_gadget *gadget)
1368 {
1369         struct printer_dev      *dev;
1370         struct usb_ep           *in_ep, *out_ep;
1371         int                     status = -ENOMEM;
1372         int                     gcnum;
1373         size_t                  len;
1374         u32                     i;
1375         struct usb_request      *req;
1376
1377         dev = &usb_printer_gadget;
1378
1379
1380         /* Setup the sysfs files for the printer gadget. */
1381         dev->pdev = device_create(usb_gadget_class, NULL, g_printer_devno,
1382                                   NULL, "g_printer");
1383         if (IS_ERR(dev->pdev)) {
1384                 ERROR(dev, "Failed to create device: g_printer\n");
1385                 goto fail;
1386         }
1387
1388         /*
1389          * Register a character device as an interface to a user mode
1390          * program that handles the printer specific functionality.
1391          */
1392         cdev_init(&dev->printer_cdev, &printer_io_operations);
1393         dev->printer_cdev.owner = THIS_MODULE;
1394         status = cdev_add(&dev->printer_cdev, g_printer_devno, 1);
1395         if (status) {
1396                 ERROR(dev, "Failed to open char device\n");
1397                 goto fail;
1398         }
1399
1400         gcnum = usb_gadget_controller_number(gadget);
1401         if (gcnum >= 0) {
1402                 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
1403         } else {
1404                 dev_warn(&gadget->dev, "controller '%s' not recognized\n",
1405                         gadget->name);
1406                 /* unrecognized, but safe unless bulk is REALLY quirky */
1407                 device_desc.bcdDevice =
1408                         cpu_to_le16(0xFFFF);
1409         }
1410         snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1411                 init_utsname()->sysname, init_utsname()->release,
1412                 gadget->name);
1413
1414         device_desc.idVendor =
1415                 cpu_to_le16(PRINTER_VENDOR_NUM);
1416         device_desc.idProduct =
1417                 cpu_to_le16(PRINTER_PRODUCT_NUM);
1418
1419         /* support optional vendor/distro customization */
1420         if (idVendor) {
1421                 if (!idProduct) {
1422                         dev_err(&gadget->dev, "idVendor needs idProduct!\n");
1423                         return -ENODEV;
1424                 }
1425                 device_desc.idVendor = cpu_to_le16(idVendor);
1426                 device_desc.idProduct = cpu_to_le16(idProduct);
1427                 if (bcdDevice)
1428                         device_desc.bcdDevice = cpu_to_le16(bcdDevice);
1429         }
1430
1431         if (iManufacturer)
1432                 strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
1433
1434         if (iProduct)
1435                 strlcpy(product_desc, iProduct, sizeof product_desc);
1436
1437         if (iSerialNum)
1438                 strlcpy(serial_num, iSerialNum, sizeof serial_num);
1439
1440         if (iPNPstring)
1441                 strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2);
1442
1443         len = strlen(pnp_string);
1444         pnp_string[0] = (len >> 8) & 0xFF;
1445         pnp_string[1] = len & 0xFF;
1446
1447         /* all we really need is bulk IN/OUT */
1448         usb_ep_autoconfig_reset(gadget);
1449         in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc);
1450         if (!in_ep) {
1451 autoconf_fail:
1452                 dev_err(&gadget->dev, "can't autoconfigure on %s\n",
1453                         gadget->name);
1454                 return -ENODEV;
1455         }
1456         in_ep->driver_data = in_ep;     /* claim */
1457
1458         out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc);
1459         if (!out_ep)
1460                 goto autoconf_fail;
1461         out_ep->driver_data = out_ep;   /* claim */
1462
1463 #ifdef  CONFIG_USB_GADGET_DUALSPEED
1464         /* assumes that all endpoints are dual-speed */
1465         hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1466         hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1467 #endif  /* DUALSPEED */
1468
1469         usb_gadget_set_selfpowered(gadget);
1470
1471         if (gadget->is_otg) {
1472                 otg_desc.bmAttributes |= USB_OTG_HNP,
1473                 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1474         }
1475
1476         spin_lock_init(&dev->lock);
1477         mutex_init(&dev->lock_printer_io);
1478         INIT_LIST_HEAD(&dev->tx_reqs);
1479         INIT_LIST_HEAD(&dev->tx_reqs_active);
1480         INIT_LIST_HEAD(&dev->rx_reqs);
1481         INIT_LIST_HEAD(&dev->rx_reqs_active);
1482         INIT_LIST_HEAD(&dev->rx_buffers);
1483         init_waitqueue_head(&dev->rx_wait);
1484         init_waitqueue_head(&dev->tx_wait);
1485         init_waitqueue_head(&dev->tx_flush_wait);
1486
1487         dev->config = 0;
1488         dev->interface = -1;
1489         dev->printer_cdev_open = 0;
1490         dev->printer_status = PRINTER_NOT_ERROR;
1491         dev->current_rx_req = NULL;
1492         dev->current_rx_bytes = 0;
1493         dev->current_rx_buf = NULL;
1494
1495         dev->in_ep = in_ep;
1496         dev->out_ep = out_ep;
1497
1498         /* preallocate control message data and buffer */
1499         dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE,
1500                         GFP_KERNEL);
1501         if (!dev->req) {
1502                 status = -ENOMEM;
1503                 goto fail;
1504         }
1505
1506         for (i = 0; i < QLEN; i++) {
1507                 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1508                 if (!req) {
1509                         while (!list_empty(&dev->tx_reqs)) {
1510                                 req = container_of(dev->tx_reqs.next,
1511                                                 struct usb_request, list);
1512                                 list_del(&req->list);
1513                                 printer_req_free(dev->in_ep, req);
1514                         }
1515                         return -ENOMEM;
1516                 }
1517                 list_add(&req->list, &dev->tx_reqs);
1518         }
1519
1520         for (i = 0; i < QLEN; i++) {
1521                 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1522                 if (!req) {
1523                         while (!list_empty(&dev->rx_reqs)) {
1524                                 req = container_of(dev->rx_reqs.next,
1525                                                 struct usb_request, list);
1526                                 list_del(&req->list);
1527                                 printer_req_free(dev->out_ep, req);
1528                         }
1529                         return -ENOMEM;
1530                 }
1531                 list_add(&req->list, &dev->rx_reqs);
1532         }
1533
1534         dev->req->complete = printer_setup_complete;
1535
1536         /* finish hookup to lower layer ... */
1537         dev->gadget = gadget;
1538         set_gadget_data(gadget, dev);
1539         gadget->ep0->driver_data = dev;
1540
1541         INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
1542         INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name,
1543                         in_ep->name);
1544
1545         return 0;
1546
1547 fail:
1548         printer_unbind(gadget);
1549         return status;
1550 }
1551
1552 /*-------------------------------------------------------------------------*/
1553
1554 static struct usb_gadget_driver printer_driver = {
1555         .speed          = DEVSPEED,
1556
1557         .function       = (char *) driver_desc,
1558         .unbind         = printer_unbind,
1559
1560         .setup          = printer_setup,
1561         .disconnect     = printer_disconnect,
1562
1563         .driver         = {
1564                 .name           = (char *) shortname,
1565                 .owner          = THIS_MODULE,
1566         },
1567 };
1568
1569 MODULE_DESCRIPTION(DRIVER_DESC);
1570 MODULE_AUTHOR("Craig Nadler");
1571 MODULE_LICENSE("GPL");
1572
1573 static int __init
1574 init(void)
1575 {
1576         int status;
1577
1578         usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1579         if (IS_ERR(usb_gadget_class)) {
1580                 status = PTR_ERR(usb_gadget_class);
1581                 ERROR(dev, "unable to create usb_gadget class %d\n", status);
1582                 return status;
1583         }
1584
1585         status = alloc_chrdev_region(&g_printer_devno, 0, 1,
1586                         "USB printer gadget");
1587         if (status) {
1588                 ERROR(dev, "alloc_chrdev_region %d\n", status);
1589                 class_destroy(usb_gadget_class);
1590                 return status;
1591         }
1592
1593         status = usb_gadget_probe_driver(&printer_driver, printer_bind);
1594         if (status) {
1595                 class_destroy(usb_gadget_class);
1596                 unregister_chrdev_region(g_printer_devno, 1);
1597                 DBG(dev, "usb_gadget_probe_driver %x\n", status);
1598         }
1599
1600         return status;
1601 }
1602 module_init(init);
1603
1604 static void __exit
1605 cleanup(void)
1606 {
1607         int status;
1608
1609         mutex_lock(&usb_printer_gadget.lock_printer_io);
1610         status = usb_gadget_unregister_driver(&printer_driver);
1611         if (status)
1612                 ERROR(dev, "usb_gadget_unregister_driver %x\n", status);
1613
1614         unregister_chrdev_region(g_printer_devno, 2);
1615         class_destroy(usb_gadget_class);
1616         mutex_unlock(&usb_printer_gadget.lock_printer_io);
1617 }
1618 module_exit(cleanup);