drivers/usb/gadget/printer.c

   1 /*
   2  * printer.c -- Printer gadget driver
   3  *
   4  * Copyright (C) 2003-2005 David Brownell
   5  * Copyright (C) 2006 Craig W. Nadler
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/delay.h>
  25 #include <linux/ioport.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/errno.h>
  30 #include <linux/init.h>
  31 #include <linux/timer.h>
  32 #include <linux/list.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/utsname.h>
  35 #include <linux/device.h>
  36 #include <linux/moduleparam.h>
  37 #include <linux/fs.h>
  38 #include <linux/poll.h>
  39 #include <linux/types.h>
  40 #include <linux/ctype.h>
  41 #include <linux/cdev.h>
  42
  43 #include <asm/byteorder.h>
  44 #include <linux/io.h>
  45 #include <linux/irq.h>
  46 #include <asm/system.h>
  47 #include <linux/uaccess.h>
  48 #include <asm/unaligned.h>
  49
  50 #include <linux/usb/ch9.h>
  51 #include <linux/usb/gadget.h>
  52 #include <linux/usb/g_printer.h>
  53
  54 #include "gadget_chips.h"
  55
  56 #define DRIVER_DESC             "Printer Gadget"
  57 #define DRIVER_VERSION          "2007 OCT 06"
  58
  59 static const char shortname [] = "printer";
  60 static const char driver_desc [] = DRIVER_DESC;
  61
  62 static dev_t g_printer_devno;
  63
  64 static struct class *usb_gadget_class;
  65
  66 /*-------------------------------------------------------------------------*/
  67
  68 struct printer_dev {
  69         spinlock_t              lock;           /* lock this structure */
  70         /* lock buffer lists during read/write calls */
  71         spinlock_t              lock_printer_io;
  72         struct usb_gadget       *gadget;
  73         struct usb_request      *req;           /* for control responses */
  74         u8                      config;
  75         s8                      interface;
  76         struct usb_ep           *in_ep, *out_ep;
  77         const struct usb_endpoint_descriptor
  78                                 *in, *out;
  79         struct list_head        rx_reqs;        /* List of free RX structs */
  80         struct list_head        rx_reqs_active; /* List of Active RX xfers */
  81         struct list_head        rx_buffers;     /* List of completed xfers */
  82         /* wait until there is data to be read. */
  83         wait_queue_head_t       rx_wait;
  84         struct list_head        tx_reqs;        /* List of free TX structs */
  85         struct list_head        tx_reqs_active; /* List of Active TX xfers */
  86         /* Wait until there are write buffers available to use. */
  87         wait_queue_head_t       tx_wait;
  88         /* Wait until all write buffers have been sent. */
  89         wait_queue_head_t       tx_flush_wait;
  90         struct usb_request      *current_rx_req;
  91         size_t                  current_rx_bytes;
  92         u8                      *current_rx_buf;
  93         u8                      printer_status;
  94         u8                      reset_printer;
  95         struct cdev             printer_cdev;
  96         struct device           *pdev;
  97         u8                      printer_cdev_open;
  98         wait_queue_head_t       wait;
  99 };
 100
 101 static struct printer_dev usb_printer_gadget;
 102
 103 /*-------------------------------------------------------------------------*/
 104
 105 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 106  * Instead:  allocate your own, using normal USB-IF procedures.
 107  */
 108
 109 /* Thanks to NetChip Technologies for donating this product ID.
 110  */
 111 #define PRINTER_VENDOR_NUM      0x0525          /* NetChip */
 112 #define PRINTER_PRODUCT_NUM     0xa4a8          /* Linux-USB Printer Gadget */
 113
 114 /* Some systems will want different product identifers published in the
 115  * device descriptor, either numbers or strings or both.  These string
 116  * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
 117  */
 118
 119 static ushort __initdata idVendor;
 120 module_param(idVendor, ushort, S_IRUGO);
 121 MODULE_PARM_DESC(idVendor, "USB Vendor ID");
 122
 123 static ushort __initdata idProduct;
 124 module_param(idProduct, ushort, S_IRUGO);
 125 MODULE_PARM_DESC(idProduct, "USB Product ID");
 126
 127 static ushort __initdata bcdDevice;
 128 module_param(bcdDevice, ushort, S_IRUGO);
 129 MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
 130
 131 static char *__initdata iManufacturer;
 132 module_param(iManufacturer, charp, S_IRUGO);
 133 MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
 134
 135 static char *__initdata iProduct;
 136 module_param(iProduct, charp, S_IRUGO);
 137 MODULE_PARM_DESC(iProduct, "USB Product string");
 138
 139 static char *__initdata iSerialNum;
 140 module_param(iSerialNum, charp, S_IRUGO);
 141 MODULE_PARM_DESC(iSerialNum, "1");
 142
 143 static char *__initdata iPNPstring;
 144 module_param(iPNPstring, charp, S_IRUGO);
 145 MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
 146
 147 /* Number of requests to allocate per endpoint, not used for ep0. */
 148 static unsigned qlen = 10;
 149 module_param(qlen, uint, S_IRUGO|S_IWUSR);
 150
 151 #define QLEN    qlen
 152
 153 #ifdef CONFIG_USB_GADGET_DUALSPEED
 154 #define DEVSPEED        USB_SPEED_HIGH
 155 #else   /* full speed (low speed doesn't do bulk) */
 156 #define DEVSPEED        USB_SPEED_FULL
 157 #endif
 158
 159 /*-------------------------------------------------------------------------*/
 160
 161 #define xprintk(d, level, fmt, args...) \
 162         printk(level "%s: " fmt, DRIVER_DESC, ## args)
 163
 164 #ifdef DEBUG
 165 #define DBG(dev, fmt, args...) \
 166         xprintk(dev, KERN_DEBUG, fmt, ## args)
 167 #else
 168 #define DBG(dev, fmt, args...) \
 169         do { } while (0)
 170 #endif /* DEBUG */
 171
 172 #ifdef VERBOSE
 173 #define VDBG(dev, fmt, args...) \
 174         xprintk(dev, KERN_DEBUG, fmt, ## args)
 175 #else
 176 #define VDBG(dev, fmt, args...) \
 177         do { } while (0)
 178 #endif /* VERBOSE */
 179
 180 #define ERROR(dev, fmt, args...) \
 181         xprintk(dev, KERN_ERR, fmt, ## args)
 182 #define WARN(dev, fmt, args...) \
 183         xprintk(dev, KERN_WARNING, fmt, ## args)
 184 #define INFO(dev, fmt, args...) \
 185         xprintk(dev, KERN_INFO, fmt, ## args)
 186
 187 /*-------------------------------------------------------------------------*/
 188
 189 /* USB DRIVER HOOKUP (to the hardware driver, below us), mostly
 190  * ep0 implementation:  descriptors, config management, setup().
 191  * also optional class-specific notification interrupt transfer.
 192  */
 193
 194 /*
 195  * DESCRIPTORS ... most are static, but strings and (full) configuration
 196  * descriptors are built on demand.
 197  */
 198
 199 #define STRING_MANUFACTURER             1
 200 #define STRING_PRODUCT                  2
 201 #define STRING_SERIALNUM                3
 202
 203 /* holds our biggest descriptor */
 204 #define USB_DESC_BUFSIZE                256
 205 #define USB_BUFSIZE                     8192
 206
 207 /* This device advertises one configuration. */
 208 #define DEV_CONFIG_VALUE                1
 209 #define PRINTER_INTERFACE               0
 210
 211 static struct usb_device_descriptor device_desc = {
 212         .bLength =              sizeof device_desc,
 213         .bDescriptorType =      USB_DT_DEVICE,
 214         .bcdUSB =               __constant_cpu_to_le16(0x0200),
 215         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
 216         .bDeviceSubClass =      0,
 217         .bDeviceProtocol =      0,
 218         .idVendor =             __constant_cpu_to_le16(PRINTER_VENDOR_NUM),
 219         .idProduct =            __constant_cpu_to_le16(PRINTER_PRODUCT_NUM),
 220         .iManufacturer =        STRING_MANUFACTURER,
 221         .iProduct =             STRING_PRODUCT,
 222         .iSerialNumber =        STRING_SERIALNUM,
 223         .bNumConfigurations =   1
 224 };
 225
 226 static struct usb_otg_descriptor otg_desc = {
 227         .bLength =              sizeof otg_desc,
 228         .bDescriptorType =      USB_DT_OTG,
 229         .bmAttributes =         USB_OTG_SRP
 230 };
 231
 232 static struct usb_config_descriptor config_desc = {
 233         .bLength =              sizeof config_desc,
 234         .bDescriptorType =      USB_DT_CONFIG,
 235
 236         /* compute wTotalLength on the fly */
 237         .bNumInterfaces =       1,
 238         .bConfigurationValue =  DEV_CONFIG_VALUE,
 239         .iConfiguration =       0,
 240         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 241         .bMaxPower =            1       /* Self-Powered */
 242 };
 243
 244 static struct usb_interface_descriptor intf_desc = {
 245         .bLength =              sizeof intf_desc,
 246         .bDescriptorType =      USB_DT_INTERFACE,
 247         .bInterfaceNumber =     PRINTER_INTERFACE,
 248         .bNumEndpoints =        2,
 249         .bInterfaceClass =      USB_CLASS_PRINTER,
 250         .bInterfaceSubClass =   1,      /* Printer Sub-Class */
 251         .bInterfaceProtocol =   2,      /* Bi-Directional */
 252         .iInterface =           0
 253 };
 254
 255 static struct usb_endpoint_descriptor fs_ep_in_desc = {
 256         .bLength =              USB_DT_ENDPOINT_SIZE,
 257         .bDescriptorType =      USB_DT_ENDPOINT,
 258         .bEndpointAddress =     USB_DIR_IN,
 259         .bmAttributes =         USB_ENDPOINT_XFER_BULK
 260 };
 261
 262 static struct usb_endpoint_descriptor fs_ep_out_desc = {
 263         .bLength =              USB_DT_ENDPOINT_SIZE,
 264         .bDescriptorType =      USB_DT_ENDPOINT,
 265         .bEndpointAddress =     USB_DIR_OUT,
 266         .bmAttributes =         USB_ENDPOINT_XFER_BULK
 267 };
 268
 269 static const struct usb_descriptor_header *fs_printer_function [11] = {
 270         (struct usb_descriptor_header *) &otg_desc,
 271         (struct usb_descriptor_header *) &intf_desc,
 272         (struct usb_descriptor_header *) &fs_ep_in_desc,
 273         (struct usb_descriptor_header *) &fs_ep_out_desc,
 274         NULL
 275 };
 276
 277 #ifdef  CONFIG_USB_GADGET_DUALSPEED
 278
 279 /*
 280  * usb 2.0 devices need to expose both high speed and full speed
 281  * descriptors, unless they only run at full speed.
 282  */
 283
 284 static struct usb_endpoint_descriptor hs_ep_in_desc = {
 285         .bLength =              USB_DT_ENDPOINT_SIZE,
 286         .bDescriptorType =      USB_DT_ENDPOINT,
 287         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 288         .wMaxPacketSize =       __constant_cpu_to_le16(512)
 289 };
 290
 291 static struct usb_endpoint_descriptor hs_ep_out_desc = {
 292         .bLength =              USB_DT_ENDPOINT_SIZE,
 293         .bDescriptorType =      USB_DT_ENDPOINT,
 294         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 295         .wMaxPacketSize =       __constant_cpu_to_le16(512)
 296 };
 297
 298 static struct usb_qualifier_descriptor dev_qualifier = {
 299         .bLength =              sizeof dev_qualifier,
 300         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
 301         .bcdUSB =               __constant_cpu_to_le16(0x0200),
 302         .bDeviceClass =         USB_CLASS_PRINTER,
 303         .bNumConfigurations =   1
 304 };
 305
 306 static const struct usb_descriptor_header *hs_printer_function [11] = {
 307         (struct usb_descriptor_header *) &otg_desc,
 308         (struct usb_descriptor_header *) &intf_desc,
 309         (struct usb_descriptor_header *) &hs_ep_in_desc,
 310         (struct usb_descriptor_header *) &hs_ep_out_desc,
 311         NULL
 312 };
 313
 314 /* maxpacket and other transfer characteristics vary by speed. */
 315 #define ep_desc(g, hs, fs) (((g)->speed == USB_SPEED_HIGH)?(hs):(fs))
 316
 317 #else
 318
 319 /* if there's no high speed support, maxpacket doesn't change. */
 320 #define ep_desc(g, hs, fs) (((void)(g)), (fs))
 321
 322 #endif  /* !CONFIG_USB_GADGET_DUALSPEED */
 323
 324 /*-------------------------------------------------------------------------*/
 325
 326 /* descriptors that are built on-demand */
 327
 328 static char                             manufacturer [50];
 329 static char                             product_desc [40] = DRIVER_DESC;
 330 static char                             serial_num [40] = "1";
 331 static char                             pnp_string [1024] =
 332         "XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
 333
 334 /* static strings, in UTF-8 */
 335 static struct usb_string                strings [] = {
 336         { STRING_MANUFACTURER,  manufacturer, },
 337         { STRING_PRODUCT,       product_desc, },
 338         { STRING_SERIALNUM,     serial_num, },
 339         {  }            /* end of list */
 340 };
 341
 342 static struct usb_gadget_strings        stringtab = {
 343         .language       = 0x0409,       /* en-us */
 344         .strings        = strings,
 345 };
 346
 347 /*-------------------------------------------------------------------------*/
 348
 349 static struct usb_request *
 350 printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
 351 {
 352         struct usb_request      *req;
 353
 354         req = usb_ep_alloc_request(ep, gfp_flags);
 355
 356         if (req != NULL) {
 357                 req->length = len;
 358                 req->buf = kmalloc(len, gfp_flags);
 359                 if (req->buf == NULL) {
 360                         usb_ep_free_request(ep, req);
 361                         return NULL;
 362                 }
 363         }
 364
 365         return req;
 366 }
 367
 368 static void
 369 printer_req_free(struct usb_ep *ep, struct usb_request *req)
 370 {
 371         if (ep != NULL && req != NULL) {
 372                 kfree(req->buf);
 373                 usb_ep_free_request(ep, req);
 374         }
 375 }
 376
 377 /*-------------------------------------------------------------------------*/
 378
 379 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
 380 {
 381         struct printer_dev      *dev = ep->driver_data;
 382         int                     status = req->status;
 383         unsigned long           flags;
 384
 385         spin_lock_irqsave(&dev->lock, flags);
 386
 387         list_del_init(&req->list);      /* Remode from Active List */
 388
 389         switch (status) {
 390
 391         /* normal completion */
 392         case 0:
 393                 if (req->actual > 0) {
 394                         list_add_tail(&req->list, &dev->rx_buffers);
 395                         DBG(dev, "G_Printer : rx length %d\n", req->actual);
 396                 } else {
 397                         list_add(&req->list, &dev->rx_reqs);
 398                 }
 399                 break;
 400
 401         /* software-driven interface shutdown */
 402         case -ECONNRESET:               /* unlink */
 403         case -ESHUTDOWN:                /* disconnect etc */
 404                 VDBG(dev, "rx shutdown, code %d\n", status);
 405                 list_add(&req->list, &dev->rx_reqs);
 406                 break;
 407
 408         /* for hardware automagic (such as pxa) */
 409         case -ECONNABORTED:             /* endpoint reset */
 410                 DBG(dev, "rx %s reset\n", ep->name);
 411                 list_add(&req->list, &dev->rx_reqs);
 412                 break;
 413
 414         /* data overrun */
 415         case -EOVERFLOW:
 416                 /* FALLTHROUGH */
 417
 418         default:
 419                 DBG(dev, "rx status %d\n", status);
 420                 list_add(&req->list, &dev->rx_reqs);
 421                 break;
 422         }
 423
 424         wake_up_interruptible(&dev->rx_wait);
 425         spin_unlock_irqrestore(&dev->lock, flags);
 426 }
 427
 428 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
 429 {
 430         struct printer_dev      *dev = ep->driver_data;
 431
 432         switch (req->status) {
 433         default:
 434                 VDBG(dev, "tx err %d\n", req->status);
 435                 /* FALLTHROUGH */
 436         case -ECONNRESET:               /* unlink */
 437         case -ESHUTDOWN:                /* disconnect etc */
 438                 break;
 439         case 0:
 440                 break;
 441         }
 442
 443         spin_lock(&dev->lock);
 444         /* Take the request struct off the active list and put it on the
 445          * free list.
 446          */
 447         list_del_init(&req->list);
 448         list_add(&req->list, &dev->tx_reqs);
 449         wake_up_interruptible(&dev->tx_wait);
 450         if (likely(list_empty(&dev->tx_reqs_active)))
 451                 wake_up_interruptible(&dev->tx_flush_wait);
 452
 453         spin_unlock(&dev->lock);
 454 }
 455
 456 /*-------------------------------------------------------------------------*/
 457
 458 static int
 459 printer_open(struct inode *inode, struct file *fd)
 460 {
 461         struct printer_dev      *dev;
 462         unsigned long           flags;
 463         int                     ret = -EBUSY;
 464
 465         lock_kernel();
 466         dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
 467
 468         spin_lock_irqsave(&dev->lock, flags);
 469
 470         if (!dev->printer_cdev_open) {
 471                 dev->printer_cdev_open = 1;
 472                 fd->private_data = dev;
 473                 ret = 0;
 474                 /* Change the printer status to show that it's on-line. */
 475                 dev->printer_status |= PRINTER_SELECTED;
 476         }
 477
 478         spin_unlock_irqrestore(&dev->lock, flags);
 479
 480         DBG(dev, "printer_open returned %x\n", ret);
 481         unlock_kernel();
 482         return ret;
 483 }
 484
 485 static int
 486 printer_close(struct inode *inode, struct file *fd)
 487 {
 488         struct printer_dev      *dev = fd->private_data;
 489         unsigned long           flags;
 490
 491         spin_lock_irqsave(&dev->lock, flags);
 492         dev->printer_cdev_open = 0;
 493         fd->private_data = NULL;
 494         /* Change printer status to show that the printer is off-line. */
 495         dev->printer_status &= ~PRINTER_SELECTED;
 496         spin_unlock_irqrestore(&dev->lock, flags);
 497
 498         DBG(dev, "printer_close\n");
 499
 500         return 0;
 501 }
 502
 503 /* This function must be called with interrupts turned off. */
 504 static void
 505 setup_rx_reqs(struct printer_dev *dev)
 506 {
 507         struct usb_request              *req;
 508
 509         while (likely(!list_empty(&dev->rx_reqs))) {
 510                 int error;
 511
 512                 req = container_of(dev->rx_reqs.next,
 513                                 struct usb_request, list);
 514                 list_del_init(&req->list);
 515
 516                 /* The USB Host sends us whatever amount of data it wants to
 517                  * so we always set the length field to the full USB_BUFSIZE.
 518                  * If the amount of data is more than the read() caller asked
 519                  * for it will be stored in the request buffer until it is
 520                  * asked for by read().
 521                  */
 522                 req->length = USB_BUFSIZE;
 523                 req->complete = rx_complete;
 524
 525                 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
 526                 if (error) {
 527                         DBG(dev, "rx submit --> %d\n", error);
 528                         list_add(&req->list, &dev->rx_reqs);
 529                         break;
 530                 } else {
 531                         list_add(&req->list, &dev->rx_reqs_active);
 532                 }
 533         }
 534 }
 535
 536 static ssize_t
 537 printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
 538 {
 539         struct printer_dev              *dev = fd->private_data;
 540         unsigned long                   flags;
 541         size_t                          size;
 542         size_t                          bytes_copied;
 543         struct usb_request              *req;
 544         /* This is a pointer to the current USB rx request. */
 545         struct usb_request              *current_rx_req;
 546         /* This is the number of bytes in the current rx buffer. */
 547         size_t                          current_rx_bytes;
 548         /* This is a pointer to the current rx buffer. */
 549         u8                              *current_rx_buf;
 550
 551         if (len == 0)
 552                 return -EINVAL;
 553
 554         DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
 555
 556         spin_lock(&dev->lock_printer_io);
 557         spin_lock_irqsave(&dev->lock, flags);
 558
 559         /* We will use this flag later to check if a printer reset happened
 560          * after we turn interrupts back on.
 561          */
 562         dev->reset_printer = 0;
 563
 564         setup_rx_reqs(dev);
 565
 566         bytes_copied = 0;
 567         current_rx_req = dev->current_rx_req;
 568         current_rx_bytes = dev->current_rx_bytes;
 569         current_rx_buf = dev->current_rx_buf;
 570         dev->current_rx_req = NULL;
 571         dev->current_rx_bytes = 0;
 572         dev->current_rx_buf = NULL;
 573
 574         /* Check if there is any data in the read buffers. Please note that
 575          * current_rx_bytes is the number of bytes in the current rx buffer.
 576          * If it is zero then check if there are any other rx_buffers that
 577          * are on the completed list. We are only out of data if all rx
 578          * buffers are empty.
 579          */
 580         if ((current_rx_bytes == 0) &&
 581                         (likely(list_empty(&dev->rx_buffers)))) {
 582                 /* Turn interrupts back on before sleeping. */
 583                 spin_unlock_irqrestore(&dev->lock, flags);
 584
 585                 /*
 586                  * If no data is available check if this is a NON-Blocking
 587                  * call or not.
 588                  */
 589                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 590                         spin_unlock(&dev->lock_printer_io);
 591                         return -EAGAIN;
 592                 }
 593
 594                 /* Sleep until data is available */
 595                 wait_event_interruptible(dev->rx_wait,
 596                                 (likely(!list_empty(&dev->rx_buffers))));
 597                 spin_lock_irqsave(&dev->lock, flags);
 598         }
 599
 600         /* We have data to return then copy it to the caller's buffer.*/
 601         while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
 602                         && len) {
 603                 if (current_rx_bytes == 0) {
 604                         req = container_of(dev->rx_buffers.next,
 605                                         struct usb_request, list);
 606                         list_del_init(&req->list);
 607
 608                         if (req->actual && req->buf) {
 609                                 current_rx_req = req;
 610                                 current_rx_bytes = req->actual;
 611                                 current_rx_buf = req->buf;
 612                         } else {
 613                                 list_add(&req->list, &dev->rx_reqs);
 614                                 continue;
 615                         }
 616                 }
 617
 618                 /* Don't leave irqs off while doing memory copies */
 619                 spin_unlock_irqrestore(&dev->lock, flags);
 620
 621                 if (len > current_rx_bytes)
 622                         size = current_rx_bytes;
 623                 else
 624                         size = len;
 625
 626                 size -= copy_to_user(buf, current_rx_buf, size);
 627                 bytes_copied += size;
 628                 len -= size;
 629                 buf += size;
 630
 631                 spin_lock_irqsave(&dev->lock, flags);
 632
 633                 /* We've disconnected or reset so return. */
 634                 if (dev->reset_printer) {
 635                         list_add(&current_rx_req->list, &dev->rx_reqs);
 636                         spin_unlock_irqrestore(&dev->lock, flags);
 637                         spin_unlock(&dev->lock_printer_io);
 638                         return -EAGAIN;
 639                 }
 640
 641                 /* If we not returning all the data left in this RX request
 642                  * buffer then adjust the amount of data left in the buffer.
 643                  * Othewise if we are done with this RX request buffer then
 644                  * requeue it to get any incoming data from the USB host.
 645                  */
 646                 if (size < current_rx_bytes) {
 647                         current_rx_bytes -= size;
 648                         current_rx_buf += size;
 649                 } else {
 650                         list_add(&current_rx_req->list, &dev->rx_reqs);
 651                         current_rx_bytes = 0;
 652                         current_rx_buf = NULL;
 653                         current_rx_req = NULL;
 654                 }
 655         }
 656
 657         dev->current_rx_req = current_rx_req;
 658         dev->current_rx_bytes = current_rx_bytes;
 659         dev->current_rx_buf = current_rx_buf;
 660
 661         spin_unlock_irqrestore(&dev->lock, flags);
 662         spin_unlock(&dev->lock_printer_io);
 663
 664         DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
 665
 666         if (bytes_copied)
 667                 return bytes_copied;
 668         else
 669                 return -EAGAIN;
 670 }
 671
 672 static ssize_t
 673 printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 674 {
 675         struct printer_dev      *dev = fd->private_data;
 676         unsigned long           flags;
 677         size_t                  size;   /* Amount of data in a TX request. */
 678         size_t                  bytes_copied = 0;
 679         struct usb_request      *req;
 680
 681         DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
 682
 683         if (len == 0)
 684                 return -EINVAL;
 685
 686         spin_lock(&dev->lock_printer_io);
 687         spin_lock_irqsave(&dev->lock, flags);
 688
 689         /* Check if a printer reset happens while we have interrupts on */
 690         dev->reset_printer = 0;
 691
 692         /* Check if there is any available write buffers */
 693         if (likely(list_empty(&dev->tx_reqs))) {
 694                 /* Turn interrupts back on before sleeping. */
 695                 spin_unlock_irqrestore(&dev->lock, flags);
 696
 697                 /*
 698                  * If write buffers are available check if this is
 699                  * a NON-Blocking call or not.
 700                  */
 701                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 702                         spin_unlock(&dev->lock_printer_io);
 703                         return -EAGAIN;
 704                 }
 705
 706                 /* Sleep until a write buffer is available */
 707                 wait_event_interruptible(dev->tx_wait,
 708                                 (likely(!list_empty(&dev->tx_reqs))));
 709                 spin_lock_irqsave(&dev->lock, flags);
 710         }
 711
 712         while (likely(!list_empty(&dev->tx_reqs)) && len) {
 713
 714                 if (len > USB_BUFSIZE)
 715                         size = USB_BUFSIZE;
 716                 else
 717                         size = len;
 718
 719                 req = container_of(dev->tx_reqs.next, struct usb_request,
 720                                 list);
 721                 list_del_init(&req->list);
 722
 723                 req->complete = tx_complete;
 724                 req->length = size;
 725
 726                 /* Check if we need to send a zero length packet. */
 727                 if (len > size)
 728                         /* They will be more TX requests so no yet. */
 729                         req->zero = 0;
 730                 else
 731                         /* If the data amount is not a multple of the
 732                          * maxpacket size then send a zero length packet.
 733                          */
 734                         req->zero = ((len % dev->in_ep->maxpacket) == 0);
 735
 736                 /* Don't leave irqs off while doing memory copies */
 737                 spin_unlock_irqrestore(&dev->lock, flags);
 738
 739                 if (copy_from_user(req->buf, buf, size)) {
 740                         list_add(&req->list, &dev->tx_reqs);
 741                         spin_unlock(&dev->lock_printer_io);
 742                         return bytes_copied;
 743                 }
 744
 745                 bytes_copied += size;
 746                 len -= size;
 747                 buf += size;
 748
 749                 spin_lock_irqsave(&dev->lock, flags);
 750
 751                 /* We've disconnected or reset so free the req and buffer */
 752                 if (dev->reset_printer) {
 753                         list_add(&req->list, &dev->tx_reqs);
 754                         spin_unlock_irqrestore(&dev->lock, flags);
 755                         spin_unlock(&dev->lock_printer_io);
 756                         return -EAGAIN;
 757                 }
 758
 759                 if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
 760                         list_add(&req->list, &dev->tx_reqs);
 761                         spin_unlock_irqrestore(&dev->lock, flags);
 762                         spin_unlock(&dev->lock_printer_io);
 763                         return -EAGAIN;
 764                 }
 765
 766                 list_add(&req->list, &dev->tx_reqs_active);
 767
 768         }
 769
 770         spin_unlock_irqrestore(&dev->lock, flags);
 771         spin_unlock(&dev->lock_printer_io);
 772
 773         DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
 774
 775         if (bytes_copied) {
 776                 return bytes_copied;
 777         } else {
 778                 return -EAGAIN;
 779         }
 780 }
 781
 782 static int
 783 printer_fsync(struct file *fd, struct dentry *dentry, int datasync)
 784 {
 785         struct printer_dev      *dev = fd->private_data;
 786         unsigned long           flags;
 787         int                     tx_list_empty;
 788
 789         spin_lock_irqsave(&dev->lock, flags);
 790         tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
 791         spin_unlock_irqrestore(&dev->lock, flags);
 792
 793         if (!tx_list_empty) {
 794                 /* Sleep until all data has been sent */
 795                 wait_event_interruptible(dev->tx_flush_wait,
 796                                 (likely(list_empty(&dev->tx_reqs_active))));
 797         }
 798
 799         return 0;
 800 }
 801
 802 static unsigned int
 803 printer_poll(struct file *fd, poll_table *wait)
 804 {
 805         struct printer_dev      *dev = fd->private_data;
 806         unsigned long           flags;
 807         int                     status = 0;
 808
 809         spin_lock(&dev->lock_printer_io);
 810         spin_lock_irqsave(&dev->lock, flags);
 811         setup_rx_reqs(dev);
 812         spin_unlock_irqrestore(&dev->lock, flags);
 813         spin_unlock(&dev->lock_printer_io);
 814
 815         poll_wait(fd, &dev->rx_wait, wait);
 816         poll_wait(fd, &dev->tx_wait, wait);
 817
 818         spin_lock_irqsave(&dev->lock, flags);
 819         if (likely(!list_empty(&dev->tx_reqs)))
 820                 status |= POLLOUT | POLLWRNORM;
 821
 822         if (likely(dev->current_rx_bytes) ||
 823                         likely(!list_empty(&dev->rx_buffers)))
 824                 status |= POLLIN | POLLRDNORM;
 825
 826         spin_unlock_irqrestore(&dev->lock, flags);
 827
 828         return status;
 829 }
 830
 831 static int
 832 printer_ioctl(struct inode *inode, struct file *fd, unsigned int code,
 833                 unsigned long arg)
 834 {
 835         struct printer_dev      *dev = fd->private_data;
 836         unsigned long           flags;
 837         int                     status = 0;
 838
 839         DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
 840
 841         /* handle ioctls */
 842
 843         spin_lock_irqsave(&dev->lock, flags);
 844
 845         switch (code) {
 846         case GADGET_GET_PRINTER_STATUS:
 847                 status = (int)dev->printer_status;
 848                 break;
 849         case GADGET_SET_PRINTER_STATUS:
 850                 dev->printer_status = (u8)arg;
 851                 break;
 852         default:
 853                 /* could not handle ioctl */
 854                 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
 855                                 code);
 856                 status = -ENOTTY;
 857         }
 858
 859         spin_unlock_irqrestore(&dev->lock, flags);
 860
 861         return status;
 862 }
 863
 864 /* used after endpoint configuration */
 865 static struct file_operations printer_io_operations = {
 866         .owner =        THIS_MODULE,
 867         .open =         printer_open,
 868         .read =         printer_read,
 869         .write =        printer_write,
 870         .fsync =        printer_fsync,
 871         .poll =         printer_poll,
 872         .ioctl =        printer_ioctl,
 873         .release =      printer_close
 874 };
 875
 876 /*-------------------------------------------------------------------------*/
 877
 878 static int
 879 set_printer_interface(struct printer_dev *dev)
 880 {
 881         int                     result = 0;
 882
 883         dev->in = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
 884         dev->in_ep->driver_data = dev;
 885
 886         dev->out = ep_desc(dev->gadget, &hs_ep_out_desc, &fs_ep_out_desc);
 887         dev->out_ep->driver_data = dev;
 888
 889         result = usb_ep_enable(dev->in_ep, dev->in);
 890         if (result != 0) {
 891                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 892                 goto done;
 893         }
 894
 895         result = usb_ep_enable(dev->out_ep, dev->out);
 896         if (result != 0) {
 897                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 898                 goto done;
 899         }
 900
 901 done:
 902         /* on error, disable any endpoints  */
 903         if (result != 0) {
 904                 (void) usb_ep_disable(dev->in_ep);
 905                 (void) usb_ep_disable(dev->out_ep);
 906                 dev->in = NULL;
 907                 dev->out = NULL;
 908         }
 909
 910         /* caller is responsible for cleanup on error */
 911         return result;
 912 }
 913
 914 static void printer_reset_interface(struct printer_dev *dev)
 915 {
 916         if (dev->interface < 0)
 917                 return;
 918
 919         DBG(dev, "%s\n", __func__);
 920
 921         if (dev->in)
 922                 usb_ep_disable(dev->in_ep);
 923
 924         if (dev->out)
 925                 usb_ep_disable(dev->out_ep);
 926
 927         dev->interface = -1;
 928 }
 929
 930 /* change our operational config.  must agree with the code
 931  * that returns config descriptors, and altsetting code.
 932  */
 933 static int
 934 printer_set_config(struct printer_dev *dev, unsigned number)
 935 {
 936         int                     result = 0;
 937         struct usb_gadget       *gadget = dev->gadget;
 938
 939         if (gadget_is_sa1100(gadget) && dev->config) {
 940                 /* tx fifo is full, but we can't clear it...*/
 941                 INFO(dev, "can't change configurations\n");
 942                 return -ESPIPE;
 943         }
 944
 945         switch (number) {
 946         case DEV_CONFIG_VALUE:
 947                 result = 0;
 948                 break;
 949         default:
 950                 result = -EINVAL;
 951                 /* FALL THROUGH */
 952         case 0:
 953                 break;
 954         }
 955
 956         if (result) {
 957                 usb_gadget_vbus_draw(dev->gadget,
 958                                 dev->gadget->is_otg ? 8 : 100);
 959         } else {
 960                 char *speed;
 961                 unsigned power;
 962
 963                 power = 2 * config_desc.bMaxPower;
 964                 usb_gadget_vbus_draw(dev->gadget, power);
 965
 966                 switch (gadget->speed) {
 967                 case USB_SPEED_FULL:    speed = "full"; break;
 968 #ifdef CONFIG_USB_GADGET_DUALSPEED
 969                 case USB_SPEED_HIGH:    speed = "high"; break;
 970 #endif
 971                 default:                speed = "?"; break;
 972                 }
 973
 974                 dev->config = number;
 975                 INFO(dev, "%s speed config #%d: %d mA, %s\n",
 976                                 speed, number, power, driver_desc);
 977         }
 978         return result;
 979 }
 980
 981 static int
 982 config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index,
 983                 int is_otg)
 984 {
 985         int                                     len;
 986         const struct usb_descriptor_header      **function;
 987 #ifdef CONFIG_USB_GADGET_DUALSPEED
 988         int                                     hs = (speed == USB_SPEED_HIGH);
 989
 990         if (type == USB_DT_OTHER_SPEED_CONFIG)
 991                 hs = !hs;
 992
 993         if (hs) {
 994                 function = hs_printer_function;
 995         } else {
 996                 function = fs_printer_function;
 997         }
 998 #else
 999         function = fs_printer_function;
1000 #endif
1001
1002         if (index >= device_desc.bNumConfigurations)
1003                 return -EINVAL;
1004
1005         /* for now, don't advertise srp-only devices */
1006         if (!is_otg)
1007                 function++;
1008
1009         len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE,
1010                         function);
1011         if (len < 0)
1012                 return len;
1013         ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1014         return len;
1015 }
1016
1017 /* Change our operational Interface. */
1018 static int
1019 set_interface(struct printer_dev *dev, unsigned number)
1020 {
1021         int                     result = 0;
1022
1023         if (gadget_is_sa1100(dev->gadget) && dev->interface < 0) {
1024                 /* tx fifo is full, but we can't clear it...*/
1025                 INFO(dev, "can't change interfaces\n");
1026                 return -ESPIPE;
1027         }
1028
1029         /* Free the current interface */
1030         switch (dev->interface) {
1031         case PRINTER_INTERFACE:
1032                 printer_reset_interface(dev);
1033                 break;
1034         }
1035
1036         switch (number) {
1037         case PRINTER_INTERFACE:
1038                 result = set_printer_interface(dev);
1039                 if (result) {
1040                         printer_reset_interface(dev);
1041                 } else {
1042                         dev->interface = PRINTER_INTERFACE;
1043                 }
1044                 break;
1045         default:
1046                 result = -EINVAL;
1047                 /* FALL THROUGH */
1048         }
1049
1050         if (!result)
1051                 INFO(dev, "Using interface %x\n", number);
1052
1053         return result;
1054 }
1055
1056 static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req)
1057 {
1058         if (req->status || req->actual != req->length)
1059                 DBG((struct printer_dev *) ep->driver_data,
1060                                 "setup complete --> %d, %d/%d\n",
1061                                 req->status, req->actual, req->length);
1062 }
1063
1064 static void printer_soft_reset(struct printer_dev *dev)
1065 {
1066         struct usb_request      *req;
1067
1068         INFO(dev, "Received Printer Reset Request\n");
1069
1070         if (usb_ep_disable(dev->in_ep))
1071                 DBG(dev, "Failed to disable USB in_ep\n");
1072         if (usb_ep_disable(dev->out_ep))
1073                 DBG(dev, "Failed to disable USB out_ep\n");
1074
1075         if (dev->current_rx_req != NULL) {
1076                 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
1077                 dev->current_rx_req = NULL;
1078         }
1079         dev->current_rx_bytes = 0;
1080         dev->current_rx_buf = NULL;
1081         dev->reset_printer = 1;
1082
1083         while (likely(!(list_empty(&dev->rx_buffers)))) {
1084                 req = container_of(dev->rx_buffers.next, struct usb_request,
1085                                 list);
1086                 list_del_init(&req->list);
1087                 list_add(&req->list, &dev->rx_reqs);
1088         }
1089
1090         while (likely(!(list_empty(&dev->rx_reqs_active)))) {
1091                 req = container_of(dev->rx_buffers.next, struct usb_request,
1092                                 list);
1093                 list_del_init(&req->list);
1094                 list_add(&req->list, &dev->rx_reqs);
1095         }
1096
1097         while (likely(!(list_empty(&dev->tx_reqs_active)))) {
1098                 req = container_of(dev->tx_reqs_active.next,
1099                                 struct usb_request, list);
1100                 list_del_init(&req->list);
1101                 list_add(&req->list, &dev->tx_reqs);
1102         }
1103
1104         if (usb_ep_enable(dev->in_ep, dev->in))
1105                 DBG(dev, "Failed to enable USB in_ep\n");
1106         if (usb_ep_enable(dev->out_ep, dev->out))
1107                 DBG(dev, "Failed to enable USB out_ep\n");
1108
1109         wake_up_interruptible(&dev->rx_wait);
1110         wake_up_interruptible(&dev->tx_wait);
1111         wake_up_interruptible(&dev->tx_flush_wait);
1112 }
1113
1114 /*-------------------------------------------------------------------------*/
1115
1116 /*
1117  * The setup() callback implements all the ep0 functionality that's not
1118  * handled lower down.
1119  */
1120 static int
1121 printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1122 {
1123         struct printer_dev      *dev = get_gadget_data(gadget);
1124         struct usb_request      *req = dev->req;
1125         int                     value = -EOPNOTSUPP;
1126         u16                     wIndex = le16_to_cpu(ctrl->wIndex);
1127         u16                     wValue = le16_to_cpu(ctrl->wValue);
1128         u16                     wLength = le16_to_cpu(ctrl->wLength);
1129
1130         DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
1131                 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
1132
1133         req->complete = printer_setup_complete;
1134
1135         switch (ctrl->bRequestType&USB_TYPE_MASK) {
1136
1137         case USB_TYPE_STANDARD:
1138                 switch (ctrl->bRequest) {
1139
1140                 case USB_REQ_GET_DESCRIPTOR:
1141                         if (ctrl->bRequestType != USB_DIR_IN)
1142                                 break;
1143                         switch (wValue >> 8) {
1144
1145                         case USB_DT_DEVICE:
1146                                 value = min(wLength, (u16) sizeof device_desc);
1147                                 memcpy(req->buf, &device_desc, value);
1148                                 break;
1149 #ifdef CONFIG_USB_GADGET_DUALSPEED
1150                         case USB_DT_DEVICE_QUALIFIER:
1151                                 if (!gadget->is_dualspeed)
1152                                         break;
1153                                 value = min(wLength,
1154                                                 (u16) sizeof dev_qualifier);
1155                                 memcpy(req->buf, &dev_qualifier, value);
1156                                 break;
1157
1158                         case USB_DT_OTHER_SPEED_CONFIG:
1159                                 if (!gadget->is_dualspeed)
1160                                         break;
1161                                 /* FALLTHROUGH */
1162 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1163                         case USB_DT_CONFIG:
1164                                 value = config_buf(gadget->speed, req->buf,
1165                                                 wValue >> 8,
1166                                                 wValue & 0xff,
1167                                                 gadget->is_otg);
1168                                 if (value >= 0)
1169                                         value = min(wLength, (u16) value);
1170                                 break;
1171
1172                         case USB_DT_STRING:
1173                                 value = usb_gadget_get_string(&stringtab,
1174                                                 wValue & 0xff, req->buf);
1175                                 if (value >= 0)
1176                                         value = min(wLength, (u16) value);
1177                                 break;
1178                         }
1179                         break;
1180
1181                 case USB_REQ_SET_CONFIGURATION:
1182                         if (ctrl->bRequestType != 0)
1183                                 break;
1184                         if (gadget->a_hnp_support)
1185                                 DBG(dev, "HNP available\n");
1186                         else if (gadget->a_alt_hnp_support)
1187                                 DBG(dev, "HNP needs a different root port\n");
1188                         value = printer_set_config(dev, wValue);
1189                         break;
1190                 case USB_REQ_GET_CONFIGURATION:
1191                         if (ctrl->bRequestType != USB_DIR_IN)
1192                                 break;
1193                         *(u8 *)req->buf = dev->config;
1194                         value = min(wLength, (u16) 1);
1195                         break;
1196
1197                 case USB_REQ_SET_INTERFACE:
1198                         if (ctrl->bRequestType != USB_RECIP_INTERFACE ||
1199                                         !dev->config)
1200                                 break;
1201
1202                         value = set_interface(dev, PRINTER_INTERFACE);
1203                         break;
1204                 case USB_REQ_GET_INTERFACE:
1205                         if (ctrl->bRequestType !=
1206                                         (USB_DIR_IN|USB_RECIP_INTERFACE)
1207                                         || !dev->config)
1208                                 break;
1209
1210                         *(u8 *)req->buf = dev->interface;
1211                         value = min(wLength, (u16) 1);
1212                         break;
1213
1214                 default:
1215                         goto unknown;
1216                 }
1217                 break;
1218
1219         case USB_TYPE_CLASS:
1220                 switch (ctrl->bRequest) {
1221                 case 0: /* Get the IEEE-1284 PNP String */
1222                         /* Only one printer interface is supported. */
1223                         if ((wIndex>>8) != PRINTER_INTERFACE)
1224                                 break;
1225
1226                         value = (pnp_string[0]<<8)|pnp_string[1];
1227                         memcpy(req->buf, pnp_string, value);
1228                         DBG(dev, "1284 PNP String: %x %s\n", value,
1229                                         &pnp_string[2]);
1230                         break;
1231
1232                 case 1: /* Get Port Status */
1233                         /* Only one printer interface is supported. */
1234                         if (wIndex != PRINTER_INTERFACE)
1235                                 break;
1236
1237                         *(u8 *)req->buf = dev->printer_status;
1238                         value = min(wLength, (u16) 1);
1239                         break;
1240
1241                 case 2: /* Soft Reset */
1242                         /* Only one printer interface is supported. */
1243                         if (wIndex != PRINTER_INTERFACE)
1244                                 break;
1245
1246                         printer_soft_reset(dev);
1247
1248                         value = 0;
1249                         break;
1250
1251                 default:
1252                         goto unknown;
1253                 }
1254                 break;
1255
1256         default:
1257 unknown:
1258                 VDBG(dev,
1259                         "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1260                         ctrl->bRequestType, ctrl->bRequest,
1261                         wValue, wIndex, wLength);
1262                 break;
1263         }
1264
1265         /* respond with data transfer before status phase? */
1266         if (value >= 0) {
1267                 req->length = value;
1268                 req->zero = value < wLength
1269                                 && (value % gadget->ep0->maxpacket) == 0;
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                         "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         if (gadget_is_sa1100(gadget)) {
1384                 /* hardware can't write zero length packets. */
1385                 ERROR(dev, "SA1100 controller is unsupport by this driver\n");
1386                 goto fail;
1387         }
1388
1389         gcnum = usb_gadget_controller_number(gadget);
1390         if (gcnum >= 0) {
1391                 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
1392         } else {
1393                 dev_warn(&gadget->dev, "controller '%s' not recognized\n",
1394                         gadget->name);
1395                 /* unrecognized, but safe unless bulk is REALLY quirky */
1396                 device_desc.bcdDevice =
1397                         __constant_cpu_to_le16(0xFFFF);
1398         }
1399         snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1400                 init_utsname()->sysname, init_utsname()->release,
1401                 gadget->name);
1402
1403         device_desc.idVendor =
1404                 __constant_cpu_to_le16(PRINTER_VENDOR_NUM);
1405         device_desc.idProduct =
1406                 __constant_cpu_to_le16(PRINTER_PRODUCT_NUM);
1407
1408         /* support optional vendor/distro customization */
1409         if (idVendor) {
1410                 if (!idProduct) {
1411                         dev_err(&gadget->dev, "idVendor needs idProduct!\n");
1412                         return -ENODEV;
1413                 }
1414                 device_desc.idVendor = cpu_to_le16(idVendor);
1415                 device_desc.idProduct = cpu_to_le16(idProduct);
1416                 if (bcdDevice)
1417                         device_desc.bcdDevice = cpu_to_le16(bcdDevice);
1418         }
1419
1420         if (iManufacturer)
1421                 strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
1422
1423         if (iProduct)
1424                 strlcpy(product_desc, iProduct, sizeof product_desc);
1425
1426         if (iSerialNum)
1427                 strlcpy(serial_num, iSerialNum, sizeof serial_num);
1428
1429         if (iPNPstring)
1430                 strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2);
1431
1432         len = strlen(pnp_string);
1433         pnp_string[0] = (len >> 8) & 0xFF;
1434         pnp_string[1] = len & 0xFF;
1435
1436         /* all we really need is bulk IN/OUT */
1437         usb_ep_autoconfig_reset(gadget);
1438         in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc);
1439         if (!in_ep) {
1440 autoconf_fail:
1441                 dev_err(&gadget->dev, "can't autoconfigure on %s\n",
1442                         gadget->name);
1443                 return -ENODEV;
1444         }
1445         in_ep->driver_data = in_ep;     /* claim */
1446
1447         out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc);
1448         if (!out_ep)
1449                 goto autoconf_fail;
1450         out_ep->driver_data = out_ep;   /* claim */
1451
1452 #ifdef  CONFIG_USB_GADGET_DUALSPEED
1453         /* assumes ep0 uses the same value for both speeds ... */
1454         dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
1455
1456         /* and that all endpoints are dual-speed */
1457         hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1458         hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1459 #endif  /* DUALSPEED */
1460
1461         device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1462         usb_gadget_set_selfpowered(gadget);
1463
1464         if (gadget->is_otg) {
1465                 otg_desc.bmAttributes |= USB_OTG_HNP,
1466                 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1467                 config_desc.bMaxPower = 4;
1468         }
1469
1470         spin_lock_init(&dev->lock);
1471         spin_lock_init(&dev->lock_printer_io);
1472         INIT_LIST_HEAD(&dev->tx_reqs);
1473         INIT_LIST_HEAD(&dev->tx_reqs_active);
1474         INIT_LIST_HEAD(&dev->rx_reqs);
1475         INIT_LIST_HEAD(&dev->rx_reqs_active);
1476         INIT_LIST_HEAD(&dev->rx_buffers);
1477         init_waitqueue_head(&dev->rx_wait);
1478         init_waitqueue_head(&dev->tx_wait);
1479         init_waitqueue_head(&dev->tx_flush_wait);
1480
1481         dev->config = 0;
1482         dev->interface = -1;
1483         dev->printer_cdev_open = 0;
1484         dev->printer_status = PRINTER_NOT_ERROR;
1485         dev->current_rx_req = NULL;
1486         dev->current_rx_bytes = 0;
1487         dev->current_rx_buf = NULL;
1488
1489         dev->in_ep = in_ep;
1490         dev->out_ep = out_ep;
1491
1492         /* preallocate control message data and buffer */
1493         dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE,
1494                         GFP_KERNEL);
1495         if (!dev->req) {
1496                 status = -ENOMEM;
1497                 goto fail;
1498         }
1499
1500         for (i = 0; i < QLEN; i++) {
1501                 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1502                 if (!req) {
1503                         while (!list_empty(&dev->tx_reqs)) {
1504                                 req = container_of(dev->tx_reqs.next,
1505                                                 struct usb_request, list);
1506                                 list_del(&req->list);
1507                                 printer_req_free(dev->in_ep, req);
1508                         }
1509                         return -ENOMEM;
1510                 }
1511                 list_add(&req->list, &dev->tx_reqs);
1512         }
1513
1514         for (i = 0; i < QLEN; i++) {
1515                 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1516                 if (!req) {
1517                         while (!list_empty(&dev->rx_reqs)) {
1518                                 req = container_of(dev->rx_reqs.next,
1519                                                 struct usb_request, list);
1520                                 list_del(&req->list);
1521                                 printer_req_free(dev->out_ep, req);
1522                         }
1523                         return -ENOMEM;
1524                 }
1525                 list_add(&req->list, &dev->rx_reqs);
1526         }
1527
1528         dev->req->complete = printer_setup_complete;
1529
1530         /* finish hookup to lower layer ... */
1531         dev->gadget = gadget;
1532         set_gadget_data(gadget, dev);
1533         gadget->ep0->driver_data = dev;
1534
1535         INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
1536         INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name,
1537                         in_ep->name);
1538
1539         return 0;
1540
1541 fail:
1542         printer_unbind(gadget);
1543         return status;
1544 }
1545
1546 /*-------------------------------------------------------------------------*/
1547
1548 static struct usb_gadget_driver printer_driver = {
1549         .speed          = DEVSPEED,
1550
1551         .function       = (char *) driver_desc,
1552         .bind           = printer_bind,
1553         .unbind         = printer_unbind,
1554
1555         .setup          = printer_setup,
1556         .disconnect     = printer_disconnect,
1557
1558         .driver         = {
1559                 .name           = (char *) shortname,
1560                 .owner          = THIS_MODULE,
1561         },
1562 };
1563
1564 MODULE_DESCRIPTION(DRIVER_DESC);
1565 MODULE_AUTHOR("Craig Nadler");
1566 MODULE_LICENSE("GPL");
1567
1568 static int __init
1569 init(void)
1570 {
1571         int status;
1572
1573         usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1574         if (IS_ERR(usb_gadget_class)) {
1575                 status = PTR_ERR(usb_gadget_class);
1576                 ERROR(dev, "unable to create usb_gadget class %d\n", status);
1577                 return status;
1578         }
1579
1580         status = alloc_chrdev_region(&g_printer_devno, 0, 1,
1581                         "USB printer gadget");
1582         if (status) {
1583                 ERROR(dev, "alloc_chrdev_region %d\n", status);
1584                 class_destroy(usb_gadget_class);
1585                 return status;
1586         }
1587
1588         status = usb_gadget_register_driver(&printer_driver);
1589         if (status) {
1590                 class_destroy(usb_gadget_class);
1591                 unregister_chrdev_region(g_printer_devno, 1);
1592                 DBG(dev, "usb_gadget_register_driver %x\n", status);
1593         }
1594
1595         return status;
1596 }
1597 module_init(init);
1598
1599 static void __exit
1600 cleanup(void)
1601 {
1602         int status;
1603
1604         spin_lock(&usb_printer_gadget.lock_printer_io);
1605         class_destroy(usb_gadget_class);
1606         unregister_chrdev_region(g_printer_devno, 2);
1607
1608         status = usb_gadget_unregister_driver(&printer_driver);
1609         if (status)
1610                 ERROR(dev, "usb_gadget_unregister_driver %x\n", status);
1611
1612         spin_unlock(&usb_printer_gadget.lock_printer_io);
1613 }
1614 module_exit(cleanup);