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                 list_add_tail(&req->list, &dev->rx_buffers);
 394                 wake_up_interruptible(&dev->rx_wait);
 395                 DBG(dev, "G_Printer : rx length %d\n", req->actual);
 396                 break;
 397
 398         /* software-driven interface shutdown */
 399         case -ECONNRESET:               /* unlink */
 400         case -ESHUTDOWN:                /* disconnect etc */
 401                 VDBG(dev, "rx shutdown, code %d\n", status);
 402                 list_add(&req->list, &dev->rx_reqs);
 403                 break;
 404
 405         /* for hardware automagic (such as pxa) */
 406         case -ECONNABORTED:             /* endpoint reset */
 407                 DBG(dev, "rx %s reset\n", ep->name);
 408                 list_add(&req->list, &dev->rx_reqs);
 409                 break;
 410
 411         /* data overrun */
 412         case -EOVERFLOW:
 413                 /* FALLTHROUGH */
 414
 415         default:
 416                 DBG(dev, "rx status %d\n", status);
 417                 list_add(&req->list, &dev->rx_reqs);
 418                 break;
 419         }
 420         spin_unlock_irqrestore(&dev->lock, flags);
 421 }
 422
 423 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
 424 {
 425         struct printer_dev      *dev = ep->driver_data;
 426
 427         switch (req->status) {
 428         default:
 429                 VDBG(dev, "tx err %d\n", req->status);
 430                 /* FALLTHROUGH */
 431         case -ECONNRESET:               /* unlink */
 432         case -ESHUTDOWN:                /* disconnect etc */
 433                 break;
 434         case 0:
 435                 break;
 436         }
 437
 438         spin_lock(&dev->lock);
 439         /* Take the request struct off the active list and put it on the
 440          * free list.
 441          */
 442         list_del_init(&req->list);
 443         list_add(&req->list, &dev->tx_reqs);
 444         wake_up_interruptible(&dev->tx_wait);
 445         if (likely(list_empty(&dev->tx_reqs_active)))
 446                 wake_up_interruptible(&dev->tx_flush_wait);
 447
 448         spin_unlock(&dev->lock);
 449 }
 450
 451 /*-------------------------------------------------------------------------*/
 452
 453 static int
 454 printer_open(struct inode *inode, struct file *fd)
 455 {
 456         struct printer_dev      *dev;
 457         unsigned long           flags;
 458         int                     ret = -EBUSY;
 459
 460         dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
 461
 462         spin_lock_irqsave(&dev->lock, flags);
 463
 464         if (!dev->printer_cdev_open) {
 465                 dev->printer_cdev_open = 1;
 466                 fd->private_data = dev;
 467                 ret = 0;
 468                 /* Change the printer status to show that it's on-line. */
 469                 dev->printer_status |= PRINTER_SELECTED;
 470         }
 471
 472         spin_unlock_irqrestore(&dev->lock, flags);
 473
 474         DBG(dev, "printer_open returned %x\n", ret);
 475
 476         return ret;
 477 }
 478
 479 static int
 480 printer_close(struct inode *inode, struct file *fd)
 481 {
 482         struct printer_dev      *dev = fd->private_data;
 483         unsigned long           flags;
 484
 485         spin_lock_irqsave(&dev->lock, flags);
 486         dev->printer_cdev_open = 0;
 487         fd->private_data = NULL;
 488         /* Change printer status to show that the printer is off-line. */
 489         dev->printer_status &= ~PRINTER_SELECTED;
 490         spin_unlock_irqrestore(&dev->lock, flags);
 491
 492         DBG(dev, "printer_close\n");
 493
 494         return 0;
 495 }
 496
 497 static ssize_t
 498 printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
 499 {
 500         struct printer_dev              *dev = fd->private_data;
 501         unsigned long                   flags;
 502         size_t                          size;
 503         size_t                          bytes_copied;
 504         struct usb_request              *req;
 505         /* This is a pointer to the current USB rx request. */
 506         struct usb_request              *current_rx_req;
 507         /* This is the number of bytes in the current rx buffer. */
 508         size_t                          current_rx_bytes;
 509         /* This is a pointer to the current rx buffer. */
 510         u8                              *current_rx_buf;
 511
 512         if (len == 0)
 513                 return -EINVAL;
 514
 515         DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
 516
 517         spin_lock(&dev->lock_printer_io);
 518         spin_lock_irqsave(&dev->lock, flags);
 519
 520         /* We will use this flag later to check if a printer reset happened
 521          * after we turn interrupts back on.
 522          */
 523         dev->reset_printer = 0;
 524
 525         while (likely(!list_empty(&dev->rx_reqs))) {
 526                 int error;
 527
 528                 req = container_of(dev->rx_reqs.next,
 529                                 struct usb_request, list);
 530                 list_del_init(&req->list);
 531
 532                 /* The USB Host sends us whatever amount of data it wants to
 533                  * so we always set the length field to the full USB_BUFSIZE.
 534                  * If the amount of data is more than the read() caller asked
 535                  * for it will be stored in the request buffer until it is
 536                  * asked for by read().
 537                  */
 538                 req->length = USB_BUFSIZE;
 539                 req->complete = rx_complete;
 540
 541                 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
 542                 if (error) {
 543                         DBG(dev, "rx submit --> %d\n", error);
 544                         list_add(&req->list, &dev->rx_reqs);
 545                         break;
 546                 } else {
 547                         list_add(&req->list, &dev->rx_reqs_active);
 548                 }
 549         }
 550
 551         bytes_copied = 0;
 552         current_rx_req = dev->current_rx_req;
 553         current_rx_bytes = dev->current_rx_bytes;
 554         current_rx_buf = dev->current_rx_buf;
 555         dev->current_rx_req = NULL;
 556         dev->current_rx_bytes = 0;
 557         dev->current_rx_buf = NULL;
 558
 559         /* Check if there is any data in the read buffers. Please note that
 560          * current_rx_bytes is the number of bytes in the current rx buffer.
 561          * If it is zero then check if there are any other rx_buffers that
 562          * are on the completed list. We are only out of data if all rx
 563          * buffers are empty.
 564          */
 565         if ((current_rx_bytes == 0) &&
 566                         (likely(list_empty(&dev->rx_buffers)))) {
 567                 /* Turn interrupts back on before sleeping. */
 568                 spin_unlock_irqrestore(&dev->lock, flags);
 569
 570                 /*
 571                  * If no data is available check if this is a NON-Blocking
 572                  * call or not.
 573                  */
 574                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 575                         spin_unlock(&dev->lock_printer_io);
 576                         return -EAGAIN;
 577                 }
 578
 579                 /* Sleep until data is available */
 580                 wait_event_interruptible(dev->rx_wait,
 581                                 (likely(!list_empty(&dev->rx_buffers))));
 582                 spin_lock_irqsave(&dev->lock, flags);
 583         }
 584
 585         /* We have data to return then copy it to the caller's buffer.*/
 586         while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
 587                         && len) {
 588                 if (current_rx_bytes == 0) {
 589                         req = container_of(dev->rx_buffers.next,
 590                                         struct usb_request, list);
 591                         list_del_init(&req->list);
 592
 593                         if (req->actual && req->buf) {
 594                                 current_rx_req = req;
 595                                 current_rx_bytes = req->actual;
 596                                 current_rx_buf = req->buf;
 597                         } else {
 598                                 list_add(&req->list, &dev->rx_reqs);
 599                                 continue;
 600                         }
 601                 }
 602
 603                 /* Don't leave irqs off while doing memory copies */
 604                 spin_unlock_irqrestore(&dev->lock, flags);
 605
 606                 if (len > current_rx_bytes)
 607                         size = current_rx_bytes;
 608                 else
 609                         size = len;
 610
 611                 size -= copy_to_user(buf, current_rx_buf, size);
 612                 bytes_copied += size;
 613                 len -= size;
 614                 buf += size;
 615
 616                 spin_lock_irqsave(&dev->lock, flags);
 617
 618                 /* We've disconnected or reset free the req and buffer */
 619                 if (dev->reset_printer) {
 620                         printer_req_free(dev->out_ep, current_rx_req);
 621                         spin_unlock_irqrestore(&dev->lock, flags);
 622                         spin_unlock(&dev->lock_printer_io);
 623                         return -EAGAIN;
 624                 }
 625
 626                 /* If we not returning all the data left in this RX request
 627                  * buffer then adjust the amount of data left in the buffer.
 628                  * Othewise if we are done with this RX request buffer then
 629                  * requeue it to get any incoming data from the USB host.
 630                  */
 631                 if (size < current_rx_bytes) {
 632                         current_rx_bytes -= size;
 633                         current_rx_buf += size;
 634                 } else {
 635                         list_add(&current_rx_req->list, &dev->rx_reqs);
 636                         current_rx_bytes = 0;
 637                         current_rx_buf = NULL;
 638                         current_rx_req = NULL;
 639                 }
 640         }
 641
 642         dev->current_rx_req = current_rx_req;
 643         dev->current_rx_bytes = current_rx_bytes;
 644         dev->current_rx_buf = current_rx_buf;
 645
 646         spin_unlock_irqrestore(&dev->lock, flags);
 647         spin_unlock(&dev->lock_printer_io);
 648
 649         DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
 650
 651         if (bytes_copied)
 652                 return bytes_copied;
 653         else
 654                 return -EAGAIN;
 655 }
 656
 657 static ssize_t
 658 printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 659 {
 660         struct printer_dev      *dev = fd->private_data;
 661         unsigned long           flags;
 662         size_t                  size;   /* Amount of data in a TX request. */
 663         size_t                  bytes_copied = 0;
 664         struct usb_request      *req;
 665
 666         DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
 667
 668         if (len == 0)
 669                 return -EINVAL;
 670
 671         spin_lock(&dev->lock_printer_io);
 672         spin_lock_irqsave(&dev->lock, flags);
 673
 674         /* Check if a printer reset happens while we have interrupts on */
 675         dev->reset_printer = 0;
 676
 677         /* Check if there is any available write buffers */
 678         if (likely(list_empty(&dev->tx_reqs))) {
 679                 /* Turn interrupts back on before sleeping. */
 680                 spin_unlock_irqrestore(&dev->lock, flags);
 681
 682                 /*
 683                  * If write buffers are available check if this is
 684                  * a NON-Blocking call or not.
 685                  */
 686                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 687                         spin_unlock(&dev->lock_printer_io);
 688                         return -EAGAIN;
 689                 }
 690
 691                 /* Sleep until a write buffer is available */
 692                 wait_event_interruptible(dev->tx_wait,
 693                                 (likely(!list_empty(&dev->tx_reqs))));
 694                 spin_lock_irqsave(&dev->lock, flags);
 695         }
 696
 697         while (likely(!list_empty(&dev->tx_reqs)) && len) {
 698
 699                 if (len > USB_BUFSIZE)
 700                         size = USB_BUFSIZE;
 701                 else
 702                         size = len;
 703
 704                 req = container_of(dev->tx_reqs.next, struct usb_request,
 705                                 list);
 706                 list_del_init(&req->list);
 707
 708                 req->complete = tx_complete;
 709                 req->length = size;
 710
 711                 /* Check if we need to send a zero length packet. */
 712                 if (len > size)
 713                         /* They will be more TX requests so no yet. */
 714                         req->zero = 0;
 715                 else
 716                         /* If the data amount is not a multple of the
 717                          * maxpacket size then send a zero length packet.
 718                          */
 719                         req->zero = ((len % dev->in_ep->maxpacket) == 0);
 720
 721                 /* Don't leave irqs off while doing memory copies */
 722                 spin_unlock_irqrestore(&dev->lock, flags);
 723
 724                 if (copy_from_user(req->buf, buf, size)) {
 725                         list_add(&req->list, &dev->tx_reqs);
 726                         spin_unlock(&dev->lock_printer_io);
 727                         return bytes_copied;
 728                 }
 729
 730                 bytes_copied += size;
 731                 len -= size;
 732                 buf += size;
 733
 734                 spin_lock_irqsave(&dev->lock, flags);
 735
 736                 /* We've disconnected or reset so free the req and buffer */
 737                 if (dev->reset_printer) {
 738                         printer_req_free(dev->in_ep, req);
 739                         spin_unlock_irqrestore(&dev->lock, flags);
 740                         spin_unlock(&dev->lock_printer_io);
 741                         return -EAGAIN;
 742                 }
 743
 744                 if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
 745                         list_add(&req->list, &dev->tx_reqs);
 746                         spin_unlock_irqrestore(&dev->lock, flags);
 747                         spin_unlock(&dev->lock_printer_io);
 748                         return -EAGAIN;
 749                 }
 750
 751                 list_add(&req->list, &dev->tx_reqs_active);
 752
 753         }
 754
 755         spin_unlock_irqrestore(&dev->lock, flags);
 756         spin_unlock(&dev->lock_printer_io);
 757
 758         DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
 759
 760         if (bytes_copied) {
 761                 return bytes_copied;
 762         } else {
 763                 return -EAGAIN;
 764         }
 765 }
 766
 767 static int
 768 printer_fsync(struct file *fd, struct dentry *dentry, int datasync)
 769 {
 770         struct printer_dev      *dev = fd->private_data;
 771         unsigned long           flags;
 772         int                     tx_list_empty;
 773
 774         spin_lock_irqsave(&dev->lock, flags);
 775         tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
 776         spin_unlock_irqrestore(&dev->lock, flags);
 777
 778         if (!tx_list_empty) {
 779                 /* Sleep until all data has been sent */
 780                 wait_event_interruptible(dev->tx_flush_wait,
 781                                 (likely(list_empty(&dev->tx_reqs_active))));
 782         }
 783
 784         return 0;
 785 }
 786
 787 static unsigned int
 788 printer_poll(struct file *fd, poll_table *wait)
 789 {
 790         struct printer_dev      *dev = fd->private_data;
 791         unsigned long           flags;
 792         int                     status = 0;
 793
 794         poll_wait(fd, &dev->rx_wait, wait);
 795         poll_wait(fd, &dev->tx_wait, wait);
 796
 797         spin_lock_irqsave(&dev->lock, flags);
 798         if (likely(!list_empty(&dev->tx_reqs)))
 799                 status |= POLLOUT | POLLWRNORM;
 800
 801         if (likely(!list_empty(&dev->rx_buffers)))
 802                 status |= POLLIN | POLLRDNORM;
 803
 804         spin_unlock_irqrestore(&dev->lock, flags);
 805
 806         return status;
 807 }
 808
 809 static int
 810 printer_ioctl(struct inode *inode, struct file *fd, unsigned int code,
 811                 unsigned long arg)
 812 {
 813         struct printer_dev      *dev = fd->private_data;
 814         unsigned long           flags;
 815         int                     status = 0;
 816
 817         DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
 818
 819         /* handle ioctls */
 820
 821         spin_lock_irqsave(&dev->lock, flags);
 822
 823         switch (code) {
 824         case GADGET_GET_PRINTER_STATUS:
 825                 status = (int)dev->printer_status;
 826                 break;
 827         case GADGET_SET_PRINTER_STATUS:
 828                 dev->printer_status = (u8)arg;
 829                 break;
 830         default:
 831                 /* could not handle ioctl */
 832                 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
 833                                 code);
 834                 status = -ENOTTY;
 835         }
 836
 837         spin_unlock_irqrestore(&dev->lock, flags);
 838
 839         return status;
 840 }
 841
 842 /* used after endpoint configuration */
 843 static struct file_operations printer_io_operations = {
 844         .owner =        THIS_MODULE,
 845         .open =         printer_open,
 846         .read =         printer_read,
 847         .write =        printer_write,
 848         .fsync =        printer_fsync,
 849         .poll =         printer_poll,
 850         .ioctl =        printer_ioctl,
 851         .release =      printer_close
 852 };
 853
 854 /*-------------------------------------------------------------------------*/
 855
 856 static int
 857 set_printer_interface(struct printer_dev *dev)
 858 {
 859         int                     result = 0;
 860
 861         dev->in = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
 862         dev->in_ep->driver_data = dev;
 863
 864         dev->out = ep_desc(dev->gadget, &hs_ep_out_desc, &fs_ep_out_desc);
 865         dev->out_ep->driver_data = dev;
 866
 867         result = usb_ep_enable(dev->in_ep, dev->in);
 868         if (result != 0) {
 869                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 870                 goto done;
 871         }
 872
 873         result = usb_ep_enable(dev->out_ep, dev->out);
 874         if (result != 0) {
 875                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 876                 goto done;
 877         }
 878
 879 done:
 880         /* on error, disable any endpoints  */
 881         if (result != 0) {
 882                 (void) usb_ep_disable(dev->in_ep);
 883                 (void) usb_ep_disable(dev->out_ep);
 884                 dev->in = NULL;
 885                 dev->out = NULL;
 886         }
 887
 888         /* caller is responsible for cleanup on error */
 889         return result;
 890 }
 891
 892 static void printer_reset_interface(struct printer_dev *dev)
 893 {
 894         if (dev->interface < 0)
 895                 return;
 896
 897         DBG(dev, "%s\n", __FUNCTION__);
 898
 899         if (dev->in)
 900                 usb_ep_disable(dev->in_ep);
 901
 902         if (dev->out)
 903                 usb_ep_disable(dev->out_ep);
 904
 905         dev->interface = -1;
 906 }
 907
 908 /* change our operational config.  must agree with the code
 909  * that returns config descriptors, and altsetting code.
 910  */
 911 static int
 912 printer_set_config(struct printer_dev *dev, unsigned number)
 913 {
 914         int                     result = 0;
 915         struct usb_gadget       *gadget = dev->gadget;
 916
 917         if (gadget_is_sa1100(gadget) && dev->config) {
 918                 /* tx fifo is full, but we can't clear it...*/
 919                 INFO(dev, "can't change configurations\n");
 920                 return -ESPIPE;
 921         }
 922
 923         switch (number) {
 924         case DEV_CONFIG_VALUE:
 925                 result = 0;
 926                 break;
 927         default:
 928                 result = -EINVAL;
 929                 /* FALL THROUGH */
 930         case 0:
 931                 break;
 932         }
 933
 934         if (result) {
 935                 usb_gadget_vbus_draw(dev->gadget,
 936                                 dev->gadget->is_otg ? 8 : 100);
 937         } else {
 938                 char *speed;
 939                 unsigned power;
 940
 941                 power = 2 * config_desc.bMaxPower;
 942                 usb_gadget_vbus_draw(dev->gadget, power);
 943
 944                 switch (gadget->speed) {
 945                 case USB_SPEED_FULL:    speed = "full"; break;
 946 #ifdef CONFIG_USB_GADGET_DUALSPEED
 947                 case USB_SPEED_HIGH:    speed = "high"; break;
 948 #endif
 949                 default:                speed = "?"; break;
 950                 }
 951
 952                 dev->config = number;
 953                 INFO(dev, "%s speed config #%d: %d mA, %s\n",
 954                                 speed, number, power, driver_desc);
 955         }
 956         return result;
 957 }
 958
 959 static int
 960 config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index,
 961                 int is_otg)
 962 {
 963         int                                     len;
 964         const struct usb_descriptor_header      **function;
 965 #ifdef CONFIG_USB_GADGET_DUALSPEED
 966         int                                     hs = (speed == USB_SPEED_HIGH);
 967
 968         if (type == USB_DT_OTHER_SPEED_CONFIG)
 969                 hs = !hs;
 970
 971         if (hs) {
 972                 function = hs_printer_function;
 973         } else {
 974                 function = fs_printer_function;
 975         }
 976 #else
 977         function = fs_printer_function;
 978 #endif
 979
 980         if (index >= device_desc.bNumConfigurations)
 981                 return -EINVAL;
 982
 983         /* for now, don't advertise srp-only devices */
 984         if (!is_otg)
 985                 function++;
 986
 987         len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE,
 988                         function);
 989         if (len < 0)
 990                 return len;
 991         ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
 992         return len;
 993 }
 994
 995 /* Change our operational Interface. */
 996 static int
 997 set_interface(struct printer_dev *dev, unsigned number)
 998 {
 999         int                     result = 0;
1000
1001         if (gadget_is_sa1100(dev->gadget) && dev->interface < 0) {
1002                 /* tx fifo is full, but we can't clear it...*/
1003                 INFO(dev, "can't change interfaces\n");
1004                 return -ESPIPE;
1005         }
1006
1007         /* Free the current interface */
1008         switch (dev->interface) {
1009         case PRINTER_INTERFACE:
1010                 printer_reset_interface(dev);
1011                 break;
1012         }
1013
1014         switch (number) {
1015         case PRINTER_INTERFACE:
1016                 result = set_printer_interface(dev);
1017                 if (result) {
1018                         printer_reset_interface(dev);
1019                 } else {
1020                         dev->interface = PRINTER_INTERFACE;
1021                 }
1022                 break;
1023         default:
1024                 result = -EINVAL;
1025                 /* FALL THROUGH */
1026         }
1027
1028         if (!result)
1029                 INFO(dev, "Using interface %x\n", number);
1030
1031         return result;
1032 }
1033
1034 static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req)
1035 {
1036         if (req->status || req->actual != req->length)
1037                 DBG((struct printer_dev *) ep->driver_data,
1038                                 "setup complete --> %d, %d/%d\n",
1039                                 req->status, req->actual, req->length);
1040 }
1041
1042 static void printer_soft_reset(struct printer_dev *dev)
1043 {
1044         struct usb_request      *req;
1045
1046         INFO(dev, "Received Printer Reset Request\n");
1047
1048         if (usb_ep_disable(dev->in_ep))
1049                 DBG(dev, "Failed to disable USB in_ep\n");
1050         if (usb_ep_disable(dev->out_ep))
1051                 DBG(dev, "Failed to disable USB out_ep\n");
1052
1053         if (dev->current_rx_req != NULL) {
1054                 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
1055                 dev->current_rx_req = NULL;
1056         }
1057         dev->current_rx_bytes = 0;
1058         dev->current_rx_buf = NULL;
1059         dev->reset_printer = 1;
1060
1061         while (likely(!(list_empty(&dev->rx_buffers)))) {
1062                 req = container_of(dev->rx_buffers.next, struct usb_request,
1063                                 list);
1064                 list_del_init(&req->list);
1065                 list_add(&req->list, &dev->rx_reqs);
1066         }
1067
1068         while (likely(!(list_empty(&dev->rx_reqs_active)))) {
1069                 req = container_of(dev->rx_buffers.next, struct usb_request,
1070                                 list);
1071                 list_del_init(&req->list);
1072                 list_add(&req->list, &dev->rx_reqs);
1073         }
1074
1075         while (likely(!(list_empty(&dev->tx_reqs_active)))) {
1076                 req = container_of(dev->tx_reqs_active.next,
1077                                 struct usb_request, list);
1078                 list_del_init(&req->list);
1079                 list_add(&req->list, &dev->tx_reqs);
1080         }
1081
1082         if (usb_ep_enable(dev->in_ep, dev->in))
1083                 DBG(dev, "Failed to enable USB in_ep\n");
1084         if (usb_ep_enable(dev->out_ep, dev->out))
1085                 DBG(dev, "Failed to enable USB out_ep\n");
1086
1087         wake_up_interruptible(&dev->tx_wait);
1088         wake_up_interruptible(&dev->tx_flush_wait);
1089 }
1090
1091 /*-------------------------------------------------------------------------*/
1092
1093 /*
1094  * The setup() callback implements all the ep0 functionality that's not
1095  * handled lower down.
1096  */
1097 static int
1098 printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1099 {
1100         struct printer_dev      *dev = get_gadget_data(gadget);
1101         struct usb_request      *req = dev->req;
1102         int                     value = -EOPNOTSUPP;
1103         u16                     wIndex = le16_to_cpu(ctrl->wIndex);
1104         u16                     wValue = le16_to_cpu(ctrl->wValue);
1105         u16                     wLength = le16_to_cpu(ctrl->wLength);
1106
1107         DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
1108                 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
1109
1110         req->complete = printer_setup_complete;
1111
1112         switch (ctrl->bRequestType&USB_TYPE_MASK) {
1113
1114         case USB_TYPE_STANDARD:
1115                 switch (ctrl->bRequest) {
1116
1117                 case USB_REQ_GET_DESCRIPTOR:
1118                         if (ctrl->bRequestType != USB_DIR_IN)
1119                                 break;
1120                         switch (wValue >> 8) {
1121
1122                         case USB_DT_DEVICE:
1123                                 value = min(wLength, (u16) sizeof device_desc);
1124                                 memcpy(req->buf, &device_desc, value);
1125                                 break;
1126 #ifdef CONFIG_USB_GADGET_DUALSPEED
1127                         case USB_DT_DEVICE_QUALIFIER:
1128                                 if (!gadget->is_dualspeed)
1129                                         break;
1130                                 value = min(wLength,
1131                                                 (u16) sizeof dev_qualifier);
1132                                 memcpy(req->buf, &dev_qualifier, value);
1133                                 break;
1134
1135                         case USB_DT_OTHER_SPEED_CONFIG:
1136                                 if (!gadget->is_dualspeed)
1137                                         break;
1138                                 /* FALLTHROUGH */
1139 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1140                         case USB_DT_CONFIG:
1141                                 value = config_buf(gadget->speed, req->buf,
1142                                                 wValue >> 8,
1143                                                 wValue & 0xff,
1144                                                 gadget->is_otg);
1145                                 if (value >= 0)
1146                                         value = min(wLength, (u16) value);
1147                                 break;
1148
1149                         case USB_DT_STRING:
1150                                 value = usb_gadget_get_string(&stringtab,
1151                                                 wValue & 0xff, req->buf);
1152                                 if (value >= 0)
1153                                         value = min(wLength, (u16) value);
1154                                 break;
1155                         }
1156                         break;
1157
1158                 case USB_REQ_SET_CONFIGURATION:
1159                         if (ctrl->bRequestType != 0)
1160                                 break;
1161                         if (gadget->a_hnp_support)
1162                                 DBG(dev, "HNP available\n");
1163                         else if (gadget->a_alt_hnp_support)
1164                                 DBG(dev, "HNP needs a different root port\n");
1165                         value = printer_set_config(dev, wValue);
1166                         break;
1167                 case USB_REQ_GET_CONFIGURATION:
1168                         if (ctrl->bRequestType != USB_DIR_IN)
1169                                 break;
1170                         *(u8 *)req->buf = dev->config;
1171                         value = min(wLength, (u16) 1);
1172                         break;
1173
1174                 case USB_REQ_SET_INTERFACE:
1175                         if (ctrl->bRequestType != USB_RECIP_INTERFACE ||
1176                                         !dev->config)
1177                                 break;
1178
1179                         value = set_interface(dev, PRINTER_INTERFACE);
1180                         break;
1181                 case USB_REQ_GET_INTERFACE:
1182                         if (ctrl->bRequestType !=
1183                                         (USB_DIR_IN|USB_RECIP_INTERFACE)
1184                                         || !dev->config)
1185                                 break;
1186
1187                         *(u8 *)req->buf = dev->interface;
1188                         value = min(wLength, (u16) 1);
1189                         break;
1190
1191                 default:
1192                         goto unknown;
1193                 }
1194                 break;
1195
1196         case USB_TYPE_CLASS:
1197                 switch (ctrl->bRequest) {
1198                 case 0: /* Get the IEEE-1284 PNP String */
1199                         /* Only one printer interface is supported. */
1200                         if ((wIndex>>8) != PRINTER_INTERFACE)
1201                                 break;
1202
1203                         value = (pnp_string[0]<<8)|pnp_string[1];
1204                         memcpy(req->buf, pnp_string, value);
1205                         DBG(dev, "1284 PNP String: %x %s\n", value,
1206                                         &pnp_string[2]);
1207                         break;
1208
1209                 case 1: /* Get Port Status */
1210                         /* Only one printer interface is supported. */
1211                         if (wIndex != PRINTER_INTERFACE)
1212                                 break;
1213
1214                         *(u8 *)req->buf = dev->printer_status;
1215                         value = min(wLength, (u16) 1);
1216                         break;
1217
1218                 case 2: /* Soft Reset */
1219                         /* Only one printer interface is supported. */
1220                         if (wIndex != PRINTER_INTERFACE)
1221                                 break;
1222
1223                         printer_soft_reset(dev);
1224
1225                         value = 0;
1226                         break;
1227
1228                 default:
1229                         goto unknown;
1230                 }
1231                 break;
1232
1233         default:
1234 unknown:
1235                 VDBG(dev,
1236                         "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1237                         ctrl->bRequestType, ctrl->bRequest,
1238                         wValue, wIndex, wLength);
1239                 break;
1240         }
1241
1242         /* respond with data transfer before status phase? */
1243         if (value >= 0) {
1244                 req->length = value;
1245                 req->zero = value < wLength
1246                                 && (value % gadget->ep0->maxpacket) == 0;
1247                 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1248                 if (value < 0) {
1249                         DBG(dev, "ep_queue --> %d\n", value);
1250                         req->status = 0;
1251                         printer_setup_complete(gadget->ep0, req);
1252                 }
1253         }
1254
1255         /* host either stalls (value < 0) or reports success */
1256         return value;
1257 }
1258
1259 static void
1260 printer_disconnect(struct usb_gadget *gadget)
1261 {
1262         struct printer_dev      *dev = get_gadget_data(gadget);
1263         unsigned long           flags;
1264
1265         DBG(dev, "%s\n", __FUNCTION__);
1266
1267         spin_lock_irqsave(&dev->lock, flags);
1268
1269         printer_reset_interface(dev);
1270
1271         spin_unlock_irqrestore(&dev->lock, flags);
1272 }
1273
1274 static void
1275 printer_unbind(struct usb_gadget *gadget)
1276 {
1277         struct printer_dev      *dev = get_gadget_data(gadget);
1278         struct usb_request      *req;
1279
1280
1281         DBG(dev, "%s\n", __FUNCTION__);
1282
1283         /* Remove sysfs files */
1284         device_destroy(usb_gadget_class, g_printer_devno);
1285
1286         /* Remove Character Device */
1287         cdev_del(&dev->printer_cdev);
1288
1289         /* we must already have been disconnected ... no i/o may be active */
1290         WARN_ON(!list_empty(&dev->tx_reqs_active));
1291         WARN_ON(!list_empty(&dev->rx_reqs_active));
1292
1293         /* Free all memory for this driver. */
1294         while (!list_empty(&dev->tx_reqs)) {
1295                 req = container_of(dev->tx_reqs.next, struct usb_request,
1296                                 list);
1297                 list_del(&req->list);
1298                 printer_req_free(dev->in_ep, req);
1299         }
1300
1301         if (dev->current_rx_req != NULL)
1302                 printer_req_free(dev->out_ep, dev->current_rx_req);
1303
1304         while (!list_empty(&dev->rx_reqs)) {
1305                 req = container_of(dev->rx_reqs.next,
1306                                 struct usb_request, list);
1307                 list_del(&req->list);
1308                 printer_req_free(dev->out_ep, req);
1309         }
1310
1311         while (!list_empty(&dev->rx_buffers)) {
1312                 req = container_of(dev->rx_buffers.next,
1313                                 struct usb_request, list);
1314                 list_del(&req->list);
1315                 printer_req_free(dev->out_ep, req);
1316         }
1317
1318         if (dev->req) {
1319                 printer_req_free(gadget->ep0, dev->req);
1320                 dev->req = NULL;
1321         }
1322
1323         set_gadget_data(gadget, NULL);
1324 }
1325
1326 static int __init
1327 printer_bind(struct usb_gadget *gadget)
1328 {
1329         struct printer_dev      *dev;
1330         struct usb_ep           *in_ep, *out_ep;
1331         int                     status = -ENOMEM;
1332         int                     gcnum;
1333         size_t                  len;
1334         u32                     i;
1335         struct usb_request      *req;
1336
1337         dev = &usb_printer_gadget;
1338
1339
1340         /* Setup the sysfs files for the printer gadget. */
1341         dev->pdev = device_create(usb_gadget_class, NULL, g_printer_devno,
1342                         "g_printer");
1343         if (IS_ERR(dev->pdev)) {
1344                 ERROR(dev, "Failed to create device: g_printer\n");
1345                 goto fail;
1346         }
1347
1348         /*
1349          * Register a character device as an interface to a user mode
1350          * program that handles the printer specific functionality.
1351          */
1352         cdev_init(&dev->printer_cdev, &printer_io_operations);
1353         dev->printer_cdev.owner = THIS_MODULE;
1354         status = cdev_add(&dev->printer_cdev, g_printer_devno, 1);
1355         if (status) {
1356                 ERROR(dev, "Failed to open char device\n");
1357                 goto fail;
1358         }
1359
1360         if (gadget_is_sa1100(gadget)) {
1361                 /* hardware can't write zero length packets. */
1362                 ERROR(dev, "SA1100 controller is unsupport by this driver\n");
1363                 goto fail;
1364         }
1365
1366         gcnum = usb_gadget_controller_number(gadget);
1367         if (gcnum >= 0) {
1368                 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
1369         } else {
1370                 dev_warn(&gadget->dev, "controller '%s' not recognized\n",
1371                         gadget->name);
1372                 /* unrecognized, but safe unless bulk is REALLY quirky */
1373                 device_desc.bcdDevice =
1374                         __constant_cpu_to_le16(0xFFFF);
1375         }
1376         snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1377                 init_utsname()->sysname, init_utsname()->release,
1378                 gadget->name);
1379
1380         device_desc.idVendor =
1381                 __constant_cpu_to_le16(PRINTER_VENDOR_NUM);
1382         device_desc.idProduct =
1383                 __constant_cpu_to_le16(PRINTER_PRODUCT_NUM);
1384
1385         /* support optional vendor/distro customization */
1386         if (idVendor) {
1387                 if (!idProduct) {
1388                         dev_err(&gadget->dev, "idVendor needs idProduct!\n");
1389                         return -ENODEV;
1390                 }
1391                 device_desc.idVendor = cpu_to_le16(idVendor);
1392                 device_desc.idProduct = cpu_to_le16(idProduct);
1393                 if (bcdDevice)
1394                         device_desc.bcdDevice = cpu_to_le16(bcdDevice);
1395         }
1396
1397         if (iManufacturer)
1398                 strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
1399
1400         if (iProduct)
1401                 strlcpy(product_desc, iProduct, sizeof product_desc);
1402
1403         if (iSerialNum)
1404                 strlcpy(serial_num, iSerialNum, sizeof serial_num);
1405
1406         if (iPNPstring)
1407                 strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2);
1408
1409         len = strlen(pnp_string);
1410         pnp_string[0] = (len >> 8) & 0xFF;
1411         pnp_string[1] = len & 0xFF;
1412
1413         /* all we really need is bulk IN/OUT */
1414         usb_ep_autoconfig_reset(gadget);
1415         in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc);
1416         if (!in_ep) {
1417 autoconf_fail:
1418                 dev_err(&gadget->dev, "can't autoconfigure on %s\n",
1419                         gadget->name);
1420                 return -ENODEV;
1421         }
1422         in_ep->driver_data = in_ep;     /* claim */
1423
1424         out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc);
1425         if (!out_ep)
1426                 goto autoconf_fail;
1427         out_ep->driver_data = out_ep;   /* claim */
1428
1429 #ifdef  CONFIG_USB_GADGET_DUALSPEED
1430         /* assumes ep0 uses the same value for both speeds ... */
1431         dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
1432
1433         /* and that all endpoints are dual-speed */
1434         hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1435         hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1436 #endif  /* DUALSPEED */
1437
1438         device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1439         usb_gadget_set_selfpowered(gadget);
1440
1441         if (gadget->is_otg) {
1442                 otg_desc.bmAttributes |= USB_OTG_HNP,
1443                 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1444                 config_desc.bMaxPower = 4;
1445         }
1446
1447         spin_lock_init(&dev->lock);
1448         spin_lock_init(&dev->lock_printer_io);
1449         INIT_LIST_HEAD(&dev->tx_reqs);
1450         INIT_LIST_HEAD(&dev->tx_reqs_active);
1451         INIT_LIST_HEAD(&dev->rx_reqs);
1452         INIT_LIST_HEAD(&dev->rx_reqs_active);
1453         INIT_LIST_HEAD(&dev->rx_buffers);
1454         init_waitqueue_head(&dev->rx_wait);
1455         init_waitqueue_head(&dev->tx_wait);
1456         init_waitqueue_head(&dev->tx_flush_wait);
1457
1458         dev->config = 0;
1459         dev->interface = -1;
1460         dev->printer_cdev_open = 0;
1461         dev->printer_status = PRINTER_NOT_ERROR;
1462         dev->current_rx_req = NULL;
1463         dev->current_rx_bytes = 0;
1464         dev->current_rx_buf = NULL;
1465
1466         dev->in_ep = in_ep;
1467         dev->out_ep = out_ep;
1468
1469         /* preallocate control message data and buffer */
1470         dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE,
1471                         GFP_KERNEL);
1472         if (!dev->req) {
1473                 status = -ENOMEM;
1474                 goto fail;
1475         }
1476
1477         for (i = 0; i < QLEN; i++) {
1478                 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1479                 if (!req) {
1480                         while (!list_empty(&dev->tx_reqs)) {
1481                                 req = container_of(dev->tx_reqs.next,
1482                                                 struct usb_request, list);
1483                                 list_del(&req->list);
1484                                 printer_req_free(dev->in_ep, req);
1485                         }
1486                         return -ENOMEM;
1487                 }
1488                 list_add(&req->list, &dev->tx_reqs);
1489         }
1490
1491         for (i = 0; i < QLEN; i++) {
1492                 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1493                 if (!req) {
1494                         while (!list_empty(&dev->rx_reqs)) {
1495                                 req = container_of(dev->rx_reqs.next,
1496                                                 struct usb_request, list);
1497                                 list_del(&req->list);
1498                                 printer_req_free(dev->out_ep, req);
1499                         }
1500                         return -ENOMEM;
1501                 }
1502                 list_add(&req->list, &dev->rx_reqs);
1503         }
1504
1505         dev->req->complete = printer_setup_complete;
1506
1507         /* finish hookup to lower layer ... */
1508         dev->gadget = gadget;
1509         set_gadget_data(gadget, dev);
1510         gadget->ep0->driver_data = dev;
1511
1512         INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
1513         INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name,
1514                         in_ep->name);
1515
1516         return 0;
1517
1518 fail:
1519         printer_unbind(gadget);
1520         return status;
1521 }
1522
1523 /*-------------------------------------------------------------------------*/
1524
1525 static struct usb_gadget_driver printer_driver = {
1526         .speed          = DEVSPEED,
1527
1528         .function       = (char *) driver_desc,
1529         .bind           = printer_bind,
1530         .unbind         = printer_unbind,
1531
1532         .setup          = printer_setup,
1533         .disconnect     = printer_disconnect,
1534
1535         .driver         = {
1536                 .name           = (char *) shortname,
1537                 .owner          = THIS_MODULE,
1538         },
1539 };
1540
1541 MODULE_DESCRIPTION(DRIVER_DESC);
1542 MODULE_AUTHOR("Craig Nadler");
1543 MODULE_LICENSE("GPL");
1544
1545 static int __init
1546 init(void)
1547 {
1548         int status;
1549
1550         usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1551         if (IS_ERR(usb_gadget_class)) {
1552                 status = PTR_ERR(usb_gadget_class);
1553                 ERROR(dev, "unable to create usb_gadget class %d\n", status);
1554                 return status;
1555         }
1556
1557         status = alloc_chrdev_region(&g_printer_devno, 0, 1,
1558                         "USB printer gadget");
1559         if (status) {
1560                 ERROR(dev, "alloc_chrdev_region %d\n", status);
1561                 class_destroy(usb_gadget_class);
1562                 return status;
1563         }
1564
1565         status = usb_gadget_register_driver(&printer_driver);
1566         if (status) {
1567                 class_destroy(usb_gadget_class);
1568                 unregister_chrdev_region(g_printer_devno, 1);
1569                 DBG(dev, "usb_gadget_register_driver %x\n", status);
1570         }
1571
1572         return status;
1573 }
1574 module_init(init);
1575
1576 static void __exit
1577 cleanup(void)
1578 {
1579         int status;
1580
1581         spin_lock(&usb_printer_gadget.lock_printer_io);
1582         class_destroy(usb_gadget_class);
1583         unregister_chrdev_region(g_printer_devno, 2);
1584
1585         status = usb_gadget_unregister_driver(&printer_driver);
1586         if (status)
1587                 ERROR(dev, "usb_gadget_unregister_driver %x\n", status);
1588
1589         spin_unlock(&usb_printer_gadget.lock_printer_io);
1590 }
1591 module_exit(cleanup);