git.oblomov.eu Git - linux-2.6/blob - 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 class_device     *printer_class_dev;
  96         struct cdev             printer_cdev;
  97         struct device           *pdev;
  98         u8                      printer_cdev_open;
  99         wait_queue_head_t       wait;
 100 };
 101
 102 static struct printer_dev usb_printer_gadget;
 103
 104 /*-------------------------------------------------------------------------*/
 105
 106 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 107  * Instead:  allocate your own, using normal USB-IF procedures.
 108  */
 109
 110 /* Thanks to NetChip Technologies for donating this product ID.
 111  */
 112 #define PRINTER_VENDOR_NUM      0x0525          /* NetChip */
 113 #define PRINTER_PRODUCT_NUM     0xa4a8          /* Linux-USB Printer Gadget */
 114
 115 /* Some systems will want different product identifers published in the
 116  * device descriptor, either numbers or strings or both.  These string
 117  * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
 118  */
 119
 120 static ushort __initdata idVendor;
 121 module_param(idVendor, ushort, S_IRUGO);
 122 MODULE_PARM_DESC(idVendor, "USB Vendor ID");
 123
 124 static ushort __initdata idProduct;
 125 module_param(idProduct, ushort, S_IRUGO);
 126 MODULE_PARM_DESC(idProduct, "USB Product ID");
 127
 128 static ushort __initdata bcdDevice;
 129 module_param(bcdDevice, ushort, S_IRUGO);
 130 MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
 131
 132 static char *__initdata iManufacturer;
 133 module_param(iManufacturer, charp, S_IRUGO);
 134 MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
 135
 136 static char *__initdata iProduct;
 137 module_param(iProduct, charp, S_IRUGO);
 138 MODULE_PARM_DESC(iProduct, "USB Product string");
 139
 140 static char *__initdata iSerialNum;
 141 module_param(iSerialNum, charp, S_IRUGO);
 142 MODULE_PARM_DESC(iSerialNum, "1");
 143
 144 static char *__initdata iPNPstring;
 145 module_param(iPNPstring, charp, S_IRUGO);
 146 MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
 147
 148 /* Number of requests to allocate per endpoint, not used for ep0. */
 149 static unsigned qlen = 10;
 150 module_param(qlen, uint, S_IRUGO|S_IWUSR);
 151
 152 #define QLEN    qlen
 153
 154 #ifdef CONFIG_USB_GADGET_DUALSPEED
 155 #define DEVSPEED        USB_SPEED_HIGH
 156 #else   /* full speed (low speed doesn't do bulk) */
 157 #define DEVSPEED        USB_SPEED_FULL
 158 #endif
 159
 160 /*-------------------------------------------------------------------------*/
 161
 162 #define xprintk(d, level, fmt, args...) \
 163         printk(level "%s: " fmt, DRIVER_DESC, ## args)
 164
 165 #ifdef DEBUG
 166 #define DBG(dev, fmt, args...) \
 167         xprintk(dev, KERN_DEBUG, fmt, ## args)
 168 #else
 169 #define DBG(dev, fmt, args...) \
 170         do { } while (0)
 171 #endif /* DEBUG */
 172
 173 #ifdef VERBOSE
 174 #define VDBG(dev, fmt, args...) \
 175         xprintk(dev, KERN_DEBUG, fmt, ## args)
 176 #else
 177 #define VDBG(dev, fmt, args...) \
 178         do { } while (0)
 179 #endif /* VERBOSE */
 180
 181 #define ERROR(dev, fmt, args...) \
 182         xprintk(dev, KERN_ERR, fmt, ## args)
 183 #define WARN(dev, fmt, args...) \
 184         xprintk(dev, KERN_WARNING, fmt, ## args)
 185 #define INFO(dev, fmt, args...) \
 186         xprintk(dev, KERN_INFO, fmt, ## args)
 187
 188 /*-------------------------------------------------------------------------*/
 189
 190 /* USB DRIVER HOOKUP (to the hardware driver, below us), mostly
 191  * ep0 implementation:  descriptors, config management, setup().
 192  * also optional class-specific notification interrupt transfer.
 193  */
 194
 195 /*
 196  * DESCRIPTORS ... most are static, but strings and (full) configuration
 197  * descriptors are built on demand.
 198  */
 199
 200 #define STRING_MANUFACTURER             1
 201 #define STRING_PRODUCT                  2
 202 #define STRING_SERIALNUM                3
 203
 204 /* holds our biggest descriptor */
 205 #define USB_DESC_BUFSIZE                256
 206 #define USB_BUFSIZE                     8192
 207
 208 /* This device advertises one configuration. */
 209 #define DEV_CONFIG_VALUE                1
 210 #define PRINTER_INTERFACE               0
 211
 212 static struct usb_device_descriptor device_desc = {
 213         .bLength =              sizeof device_desc,
 214         .bDescriptorType =      USB_DT_DEVICE,
 215         .bcdUSB =               __constant_cpu_to_le16(0x0200),
 216         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
 217         .bDeviceSubClass =      0,
 218         .bDeviceProtocol =      0,
 219         .idVendor =             __constant_cpu_to_le16(PRINTER_VENDOR_NUM),
 220         .idProduct =            __constant_cpu_to_le16(PRINTER_PRODUCT_NUM),
 221         .iManufacturer =        STRING_MANUFACTURER,
 222         .iProduct =             STRING_PRODUCT,
 223         .iSerialNumber =        STRING_SERIALNUM,
 224         .bNumConfigurations =   1
 225 };
 226
 227 static struct usb_otg_descriptor otg_desc = {
 228         .bLength =              sizeof otg_desc,
 229         .bDescriptorType =      USB_DT_OTG,
 230         .bmAttributes =         USB_OTG_SRP
 231 };
 232
 233 static struct usb_config_descriptor config_desc = {
 234         .bLength =              sizeof config_desc,
 235         .bDescriptorType =      USB_DT_CONFIG,
 236
 237         /* compute wTotalLength on the fly */
 238         .bNumInterfaces =       1,
 239         .bConfigurationValue =  DEV_CONFIG_VALUE,
 240         .iConfiguration =       0,
 241         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 242         .bMaxPower =            1       /* Self-Powered */
 243 };
 244
 245 static struct usb_interface_descriptor intf_desc = {
 246         .bLength =              sizeof intf_desc,
 247         .bDescriptorType =      USB_DT_INTERFACE,
 248         .bInterfaceNumber =     PRINTER_INTERFACE,
 249         .bNumEndpoints =        2,
 250         .bInterfaceClass =      USB_CLASS_PRINTER,
 251         .bInterfaceSubClass =   1,      /* Printer Sub-Class */
 252         .bInterfaceProtocol =   2,      /* Bi-Directional */
 253         .iInterface =           0
 254 };
 255
 256 static struct usb_endpoint_descriptor fs_ep_in_desc = {
 257         .bLength =              USB_DT_ENDPOINT_SIZE,
 258         .bDescriptorType =      USB_DT_ENDPOINT,
 259         .bEndpointAddress =     USB_DIR_IN,
 260         .bmAttributes =         USB_ENDPOINT_XFER_BULK
 261 };
 262
 263 static struct usb_endpoint_descriptor fs_ep_out_desc = {
 264         .bLength =              USB_DT_ENDPOINT_SIZE,
 265         .bDescriptorType =      USB_DT_ENDPOINT,
 266         .bEndpointAddress =     USB_DIR_OUT,
 267         .bmAttributes =         USB_ENDPOINT_XFER_BULK
 268 };
 269
 270 static const struct usb_descriptor_header *fs_printer_function [11] = {
 271         (struct usb_descriptor_header *) &otg_desc,
 272         (struct usb_descriptor_header *) &intf_desc,
 273         (struct usb_descriptor_header *) &fs_ep_in_desc,
 274         (struct usb_descriptor_header *) &fs_ep_out_desc,
 275         NULL
 276 };
 277
 278 #ifdef  CONFIG_USB_GADGET_DUALSPEED
 279
 280 /*
 281  * usb 2.0 devices need to expose both high speed and full speed
 282  * descriptors, unless they only run at full speed.
 283  */
 284
 285 static struct usb_endpoint_descriptor hs_ep_in_desc = {
 286         .bLength =              USB_DT_ENDPOINT_SIZE,
 287         .bDescriptorType =      USB_DT_ENDPOINT,
 288         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 289         .wMaxPacketSize =       __constant_cpu_to_le16(512)
 290 };
 291
 292 static struct usb_endpoint_descriptor hs_ep_out_desc = {
 293         .bLength =              USB_DT_ENDPOINT_SIZE,
 294         .bDescriptorType =      USB_DT_ENDPOINT,
 295         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 296         .wMaxPacketSize =       __constant_cpu_to_le16(512)
 297 };
 298
 299 static struct usb_qualifier_descriptor dev_qualifier = {
 300         .bLength =              sizeof dev_qualifier,
 301         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
 302         .bcdUSB =               __constant_cpu_to_le16(0x0200),
 303         .bDeviceClass =         USB_CLASS_PRINTER,
 304         .bNumConfigurations =   1
 305 };
 306
 307 static const struct usb_descriptor_header *hs_printer_function [11] = {
 308         (struct usb_descriptor_header *) &otg_desc,
 309         (struct usb_descriptor_header *) &intf_desc,
 310         (struct usb_descriptor_header *) &hs_ep_in_desc,
 311         (struct usb_descriptor_header *) &hs_ep_out_desc,
 312         NULL
 313 };
 314
 315 /* maxpacket and other transfer characteristics vary by speed. */
 316 #define ep_desc(g, hs, fs) (((g)->speed == USB_SPEED_HIGH)?(hs):(fs))
 317
 318 #else
 319
 320 /* if there's no high speed support, maxpacket doesn't change. */
 321 #define ep_desc(g, hs, fs) (((void)(g)), (fs))
 322
 323 #endif  /* !CONFIG_USB_GADGET_DUALSPEED */
 324
 325 /*-------------------------------------------------------------------------*/
 326
 327 /* descriptors that are built on-demand */
 328
 329 static char                             manufacturer [50];
 330 static char                             product_desc [40] = DRIVER_DESC;
 331 static char                             serial_num [40] = "1";
 332 static char                             pnp_string [1024] =
 333         "XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
 334
 335 /* static strings, in UTF-8 */
 336 static struct usb_string                strings [] = {
 337         { STRING_MANUFACTURER,  manufacturer, },
 338         { STRING_PRODUCT,       product_desc, },
 339         { STRING_SERIALNUM,     serial_num, },
 340         {  }            /* end of list */
 341 };
 342
 343 static struct usb_gadget_strings        stringtab = {
 344         .language       = 0x0409,       /* en-us */
 345         .strings        = strings,
 346 };
 347
 348 /*-------------------------------------------------------------------------*/
 349
 350 static struct usb_request *
 351 printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
 352 {
 353         struct usb_request      *req;
 354
 355         req = usb_ep_alloc_request(ep, gfp_flags);
 356
 357         if (req != NULL) {
 358                 req->length = len;
 359                 req->buf = kmalloc(len, gfp_flags);
 360                 if (req->buf == NULL) {
 361                         usb_ep_free_request(ep, req);
 362                         return NULL;
 363                 }
 364         }
 365
 366         return req;
 367 }
 368
 369 static void
 370 printer_req_free(struct usb_ep *ep, struct usb_request *req)
 371 {
 372         if (ep != NULL && req != NULL) {
 373                 kfree(req->buf);
 374                 usb_ep_free_request(ep, req);
 375         }
 376 }
 377
 378 /*-------------------------------------------------------------------------*/
 379
 380 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
 381 {
 382         struct printer_dev      *dev = ep->driver_data;
 383         int                     status = req->status;
 384         unsigned long           flags;
 385
 386         spin_lock_irqsave(&dev->lock, flags);
 387
 388         list_del_init(&req->list);      /* Remode from Active List */
 389
 390         switch (status) {
 391
 392         /* normal completion */
 393         case 0:
 394                 list_add_tail(&req->list, &dev->rx_buffers);
 395                 wake_up_interruptible(&dev->rx_wait);
 396                 DBG(dev, "G_Printer : rx length %d\n", req->actual);
 397                 break;
 398
 399         /* software-driven interface shutdown */
 400         case -ECONNRESET:               /* unlink */
 401         case -ESHUTDOWN:                /* disconnect etc */
 402                 VDBG(dev, "rx shutdown, code %d\n", status);
 403                 list_add(&req->list, &dev->rx_reqs);
 404                 break;
 405
 406         /* for hardware automagic (such as pxa) */
 407         case -ECONNABORTED:             /* endpoint reset */
 408                 DBG(dev, "rx %s reset\n", ep->name);
 409                 list_add(&req->list, &dev->rx_reqs);
 410                 break;
 411
 412         /* data overrun */
 413         case -EOVERFLOW:
 414                 /* FALLTHROUGH */
 415
 416         default:
 417                 DBG(dev, "rx status %d\n", status);
 418                 list_add(&req->list, &dev->rx_reqs);
 419                 break;
 420         }
 421         spin_unlock_irqrestore(&dev->lock, flags);
 422 }
 423
 424 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
 425 {
 426         struct printer_dev      *dev = ep->driver_data;
 427
 428         switch (req->status) {
 429         default:
 430                 VDBG(dev, "tx err %d\n", req->status);
 431                 /* FALLTHROUGH */
 432         case -ECONNRESET:               /* unlink */
 433         case -ESHUTDOWN:                /* disconnect etc */
 434                 break;
 435         case 0:
 436                 break;
 437         }
 438
 439         spin_lock(&dev->lock);
 440         /* Take the request struct off the active list and put it on the
 441          * free list.
 442          */
 443         list_del_init(&req->list);
 444         list_add(&req->list, &dev->tx_reqs);
 445         wake_up_interruptible(&dev->tx_wait);
 446         if (likely(list_empty(&dev->tx_reqs_active)))
 447                 wake_up_interruptible(&dev->tx_flush_wait);
 448
 449         spin_unlock(&dev->lock);
 450 }
 451
 452 /*-------------------------------------------------------------------------*/
 453
 454 static int
 455 printer_open(struct inode *inode, struct file *fd)
 456 {
 457         struct printer_dev      *dev;
 458         unsigned long           flags;
 459         int                     ret = -EBUSY;
 460
 461         dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
 462
 463         spin_lock_irqsave(&dev->lock, flags);
 464
 465         if (!dev->printer_cdev_open) {
 466                 dev->printer_cdev_open = 1;
 467                 fd->private_data = dev;
 468                 ret = 0;
 469                 /* Change the printer status to show that it's on-line. */
 470                 dev->printer_status |= PRINTER_SELECTED;
 471         }
 472
 473         spin_unlock_irqrestore(&dev->lock, flags);
 474
 475         DBG(dev, "printer_open returned %x\n", ret);
 476
 477         return ret;
 478 }
 479
 480 static int
 481 printer_close(struct inode *inode, struct file *fd)
 482 {
 483         struct printer_dev      *dev = fd->private_data;
 484         unsigned long           flags;
 485
 486         spin_lock_irqsave(&dev->lock, flags);
 487         dev->printer_cdev_open = 0;
 488         fd->private_data = NULL;
 489         /* Change printer status to show that the printer is off-line. */
 490         dev->printer_status &= ~PRINTER_SELECTED;
 491         spin_unlock_irqrestore(&dev->lock, flags);
 492
 493         DBG(dev, "printer_close\n");
 494
 495         return 0;
 496 }
 497
 498 static ssize_t
 499 printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
 500 {
 501         struct printer_dev              *dev = fd->private_data;
 502         unsigned long                   flags;
 503         size_t                          size;
 504         size_t                          bytes_copied;
 505         struct usb_request              *req;
 506         /* This is a pointer to the current USB rx request. */
 507         struct usb_request              *current_rx_req;
 508         /* This is the number of bytes in the current rx buffer. */
 509         size_t                          current_rx_bytes;
 510         /* This is a pointer to the current rx buffer. */
 511         u8                              *current_rx_buf;
 512
 513         if (len == 0)
 514                 return -EINVAL;
 515
 516         DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
 517
 518         spin_lock(&dev->lock_printer_io);
 519         spin_lock_irqsave(&dev->lock, flags);
 520
 521         /* We will use this flag later to check if a printer reset happened
 522          * after we turn interrupts back on.
 523          */
 524         dev->reset_printer = 0;
 525
 526         while (likely(!list_empty(&dev->rx_reqs))) {
 527                 int error;
 528
 529                 req = container_of(dev->rx_reqs.next,
 530                                 struct usb_request, list);
 531                 list_del_init(&req->list);
 532
 533                 /* The USB Host sends us whatever amount of data it wants to
 534                  * so we always set the length field to the full USB_BUFSIZE.
 535                  * If the amount of data is more than the read() caller asked
 536                  * for it will be stored in the request buffer until it is
 537                  * asked for by read().
 538                  */
 539                 req->length = USB_BUFSIZE;
 540                 req->complete = rx_complete;
 541
 542                 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
 543                 if (error) {
 544                         DBG(dev, "rx submit --> %d\n", error);
 545                         list_add(&req->list, &dev->rx_reqs);
 546                         break;
 547                 } else {
 548                         list_add(&req->list, &dev->rx_reqs_active);
 549                 }
 550         }
 551
 552         bytes_copied = 0;
 553         current_rx_req = dev->current_rx_req;
 554         current_rx_bytes = dev->current_rx_bytes;
 555         current_rx_buf = dev->current_rx_buf;
 556         dev->current_rx_req = NULL;
 557         dev->current_rx_bytes = 0;
 558         dev->current_rx_buf = NULL;
 559
 560         /* Check if there is any data in the read buffers. Please note that
 561          * current_rx_bytes is the number of bytes in the current rx buffer.
 562          * If it is zero then check if there are any other rx_buffers that
 563          * are on the completed list. We are only out of data if all rx
 564          * buffers are empty.
 565          */
 566         if ((current_rx_bytes == 0) &&
 567                         (likely(list_empty(&dev->rx_buffers)))) {
 568                 /* Turn interrupts back on before sleeping. */
 569                 spin_unlock_irqrestore(&dev->lock, flags);
 570
 571                 /*
 572                  * If no data is available check if this is a NON-Blocking
 573                  * call or not.
 574                  */
 575                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 576                         spin_unlock(&dev->lock_printer_io);
 577                         return -EAGAIN;
 578                 }
 579
 580                 /* Sleep until data is available */
 581                 wait_event_interruptible(dev->rx_wait,
 582                                 (likely(!list_empty(&dev->rx_buffers))));
 583                 spin_lock_irqsave(&dev->lock, flags);
 584         }
 585
 586         /* We have data to return then copy it to the caller's buffer.*/
 587         while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
 588                         && len) {
 589                 if (current_rx_bytes == 0) {
 590                         req = container_of(dev->rx_buffers.next,
 591                                         struct usb_request, list);
 592                         list_del_init(&req->list);
 593
 594                         if (req->actual && req->buf) {
 595                                 current_rx_req = req;
 596                                 current_rx_bytes = req->actual;
 597                                 current_rx_buf = req->buf;
 598                         } else {
 599                                 list_add(&req->list, &dev->rx_reqs);
 600                                 continue;
 601                         }
 602                 }
 603
 604                 /* Don't leave irqs off while doing memory copies */
 605                 spin_unlock_irqrestore(&dev->lock, flags);
 606
 607                 if (len > current_rx_bytes)
 608                         size = current_rx_bytes;
 609                 else
 610                         size = len;
 611
 612                 size -= copy_to_user(buf, current_rx_buf, size);
 613                 bytes_copied += size;
 614                 len -= size;
 615                 buf += size;
 616
 617                 spin_lock_irqsave(&dev->lock, flags);
 618
 619                 /* We've disconnected or reset free the req and buffer */
 620                 if (dev->reset_printer) {
 621                         printer_req_free(dev->out_ep, current_rx_req);
 622                         spin_unlock_irqrestore(&dev->lock, flags);
 623                         spin_unlock(&dev->lock_printer_io);
 624                         return -EAGAIN;
 625                 }
 626
 627                 /* If we not returning all the data left in this RX request
 628                  * buffer then adjust the amount of data left in the buffer.
 629                  * Othewise if we are done with this RX request buffer then
 630                  * requeue it to get any incoming data from the USB host.
 631                  */
 632                 if (size < current_rx_bytes) {
 633                         current_rx_bytes -= size;
 634                         current_rx_buf += size;
 635                 } else {
 636                         list_add(&current_rx_req->list, &dev->rx_reqs);
 637                         current_rx_bytes = 0;
 638                         current_rx_buf = NULL;
 639                         current_rx_req = NULL;
 640                 }
 641         }
 642
 643         dev->current_rx_req = current_rx_req;
 644         dev->current_rx_bytes = current_rx_bytes;
 645         dev->current_rx_buf = current_rx_buf;
 646
 647         spin_unlock_irqrestore(&dev->lock, flags);
 648         spin_unlock(&dev->lock_printer_io);
 649
 650         DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
 651
 652         if (bytes_copied)
 653                 return bytes_copied;
 654         else
 655                 return -EAGAIN;
 656 }
 657
 658 static ssize_t
 659 printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 660 {
 661         struct printer_dev      *dev = fd->private_data;
 662         unsigned long           flags;
 663         size_t                  size;   /* Amount of data in a TX request. */
 664         size_t                  bytes_copied = 0;
 665         struct usb_request      *req;
 666
 667         DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
 668
 669         if (len == 0)
 670                 return -EINVAL;
 671
 672         spin_lock(&dev->lock_printer_io);
 673         spin_lock_irqsave(&dev->lock, flags);
 674
 675         /* Check if a printer reset happens while we have interrupts on */
 676         dev->reset_printer = 0;
 677
 678         /* Check if there is any available write buffers */
 679         if (likely(list_empty(&dev->tx_reqs))) {
 680                 /* Turn interrupts back on before sleeping. */
 681                 spin_unlock_irqrestore(&dev->lock, flags);
 682
 683                 /*
 684                  * If write buffers are available check if this is
 685                  * a NON-Blocking call or not.
 686                  */
 687                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 688                         spin_unlock(&dev->lock_printer_io);
 689                         return -EAGAIN;
 690                 }
 691
 692                 /* Sleep until a write buffer is available */
 693                 wait_event_interruptible(dev->tx_wait,
 694                                 (likely(!list_empty(&dev->tx_reqs))));
 695                 spin_lock_irqsave(&dev->lock, flags);
 696         }
 697
 698         while (likely(!list_empty(&dev->tx_reqs)) && len) {
 699
 700                 if (len > USB_BUFSIZE)
 701                         size = USB_BUFSIZE;
 702                 else
 703                         size = len;
 704
 705                 req = container_of(dev->tx_reqs.next, struct usb_request,
 706                                 list);
 707                 list_del_init(&req->list);
 708
 709                 req->complete = tx_complete;
 710                 req->length = size;
 711
 712                 /* Check if we need to send a zero length packet. */
 713                 if (len > size)
 714                         /* They will be more TX requests so no yet. */
 715                         req->zero = 0;
 716                 else
 717                         /* If the data amount is not a multple of the
 718                          * maxpacket size then send a zero length packet.
 719                          */
 720                         req->zero = ((len % dev->in_ep->maxpacket) == 0);
 721
 722                 /* Don't leave irqs off while doing memory copies */
 723                 spin_unlock_irqrestore(&dev->lock, flags);
 724
 725                 if (copy_from_user(req->buf, buf, size)) {
 726                         list_add(&req->list, &dev->tx_reqs);
 727                         spin_unlock(&dev->lock_printer_io);
 728                         return bytes_copied;
 729                 }
 730
 731                 bytes_copied += size;
 732                 len -= size;
 733                 buf += size;
 734
 735                 spin_lock_irqsave(&dev->lock, flags);
 736
 737                 /* We've disconnected or reset so free the req and buffer */
 738                 if (dev->reset_printer) {
 739                         printer_req_free(dev->in_ep, req);
 740                         spin_unlock_irqrestore(&dev->lock, flags);
 741                         spin_unlock(&dev->lock_printer_io);
 742                         return -EAGAIN;
 743                 }
 744
 745                 if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
 746                         list_add(&req->list, &dev->tx_reqs);
 747                         spin_unlock_irqrestore(&dev->lock, flags);
 748                         spin_unlock(&dev->lock_printer_io);
 749                         return -EAGAIN;
 750                 }
 751
 752                 list_add(&req->list, &dev->tx_reqs_active);
 753
 754         }
 755
 756         spin_unlock_irqrestore(&dev->lock, flags);
 757         spin_unlock(&dev->lock_printer_io);
 758
 759         DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
 760
 761         if (bytes_copied) {
 762                 return bytes_copied;
 763         } else {
 764                 return -EAGAIN;
 765         }
 766 }
 767
 768 static int
 769 printer_fsync(struct file *fd, struct dentry *dentry, int datasync)
 770 {
 771         struct printer_dev      *dev = fd->private_data;
 772         unsigned long           flags;
 773         int                     tx_list_empty;
 774
 775         spin_lock_irqsave(&dev->lock, flags);
 776         tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
 777         spin_unlock_irqrestore(&dev->lock, flags);
 778
 779         if (!tx_list_empty) {
 780                 /* Sleep until all data has been sent */
 781                 wait_event_interruptible(dev->tx_flush_wait,
 782                                 (likely(list_empty(&dev->tx_reqs_active))));
 783         }
 784
 785         return 0;
 786 }
 787
 788 static unsigned int
 789 printer_poll(struct file *fd, poll_table *wait)
 790 {
 791         struct printer_dev      *dev = fd->private_data;
 792         unsigned long           flags;
 793         int                     status = 0;
 794
 795         poll_wait(fd, &dev->rx_wait, wait);
 796         poll_wait(fd, &dev->tx_wait, wait);
 797
 798         spin_lock_irqsave(&dev->lock, flags);
 799         if (likely(!list_empty(&dev->tx_reqs)))
 800                 status |= POLLOUT | POLLWRNORM;
 801
 802         if (likely(!list_empty(&dev->rx_buffers)))
 803                 status |= POLLIN | POLLRDNORM;
 804
 805         spin_unlock_irqrestore(&dev->lock, flags);
 806
 807         return status;
 808 }
 809
 810 static int
 811 printer_ioctl(struct inode *inode, struct file *fd, unsigned int code,
 812                 unsigned long arg)
 813 {
 814         struct printer_dev      *dev = fd->private_data;
 815         unsigned long           flags;
 816         int                     status = 0;
 817
 818         DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
 819
 820         /* handle ioctls */
 821
 822         spin_lock_irqsave(&dev->lock, flags);
 823
 824         switch (code) {
 825         case GADGET_GET_PRINTER_STATUS:
 826                 status = (int)dev->printer_status;
 827                 break;
 828         case GADGET_SET_PRINTER_STATUS:
 829                 dev->printer_status = (u8)arg;
 830                 break;
 831         default:
 832                 /* could not handle ioctl */
 833                 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
 834                                 code);
 835                 status = -ENOTTY;
 836         }
 837
 838         spin_unlock_irqrestore(&dev->lock, flags);
 839
 840         return status;
 841 }
 842
 843 /* used after endpoint configuration */
 844 static struct file_operations printer_io_operations = {
 845         .owner =        THIS_MODULE,
 846         .open =         printer_open,
 847         .read =         printer_read,
 848         .write =        printer_write,
 849         .fsync =        printer_fsync,
 850         .poll =         printer_poll,
 851         .ioctl =        printer_ioctl,
 852         .release =      printer_close
 853 };
 854
 855 /*-------------------------------------------------------------------------*/
 856
 857 static int
 858 set_printer_interface(struct printer_dev *dev)
 859 {
 860         int                     result = 0;
 861
 862         dev->in = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
 863         dev->in_ep->driver_data = dev;
 864
 865         dev->out = ep_desc(dev->gadget, &hs_ep_out_desc, &fs_ep_out_desc);
 866         dev->out_ep->driver_data = dev;
 867
 868         result = usb_ep_enable(dev->in_ep, dev->in);
 869         if (result != 0) {
 870                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 871                 goto done;
 872         }
 873
 874         result = usb_ep_enable(dev->out_ep, dev->out);
 875         if (result != 0) {
 876                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 877                 goto done;
 878         }
 879
 880 done:
 881         /* on error, disable any endpoints  */
 882         if (result != 0) {
 883                 (void) usb_ep_disable(dev->in_ep);
 884                 (void) usb_ep_disable(dev->out_ep);
 885                 dev->in = NULL;
 886                 dev->out = NULL;
 887         }
 888
 889         /* caller is responsible for cleanup on error */
 890         return result;
 891 }
 892
 893 static void printer_reset_interface(struct printer_dev *dev)
 894 {
 895         if (dev->interface < 0)
 896                 return;
 897
 898         DBG(dev, "%s\n", __FUNCTION__);
 899
 900         if (dev->in)
 901                 usb_ep_disable(dev->in_ep);
 902
 903         if (dev->out)
 904                 usb_ep_disable(dev->out_ep);
 905
 906         dev->interface = -1;
 907 }
 908
 909 /* change our operational config.  must agree with the code
 910  * that returns config descriptors, and altsetting code.
 911  */
 912 static int
 913 printer_set_config(struct printer_dev *dev, unsigned number)
 914 {
 915         int                     result = 0;
 916         struct usb_gadget       *gadget = dev->gadget;
 917
 918         if (gadget_is_sa1100(gadget) && dev->config) {
 919                 /* tx fifo is full, but we can't clear it...*/
 920                 INFO(dev, "can't change configurations\n");
 921                 return -ESPIPE;
 922         }
 923
 924         switch (number) {
 925         case DEV_CONFIG_VALUE:
 926                 result = 0;
 927                 break;
 928         default:
 929                 result = -EINVAL;
 930                 /* FALL THROUGH */
 931         case 0:
 932                 break;
 933         }
 934
 935         if (result) {
 936                 usb_gadget_vbus_draw(dev->gadget,
 937                                 dev->gadget->is_otg ? 8 : 100);
 938         } else {
 939                 char *speed;
 940                 unsigned power;
 941
 942                 power = 2 * config_desc.bMaxPower;
 943                 usb_gadget_vbus_draw(dev->gadget, power);
 944
 945                 switch (gadget->speed) {
 946                 case USB_SPEED_FULL:    speed = "full"; break;
 947 #ifdef CONFIG_USB_GADGET_DUALSPEED
 948                 case USB_SPEED_HIGH:    speed = "high"; break;
 949 #endif
 950                 default:                speed = "?"; break;
 951                 }
 952
 953                 dev->config = number;
 954                 INFO(dev, "%s speed config #%d: %d mA, %s\n",
 955                                 speed, number, power, driver_desc);
 956         }
 957         return result;
 958 }
 959
 960 static int
 961 config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index,
 962                 int is_otg)
 963 {
 964         int                                     len;
 965         const struct usb_descriptor_header      **function;
 966 #ifdef CONFIG_USB_GADGET_DUALSPEED
 967         int                                     hs = (speed == USB_SPEED_HIGH);
 968
 969         if (type == USB_DT_OTHER_SPEED_CONFIG)
 970                 hs = !hs;
 971
 972         if (hs) {
 973                 function = hs_printer_function;
 974         } else {
 975                 function = fs_printer_function;
 976         }
 977 #else
 978         function = fs_printer_function;
 979 #endif
 980
 981         if (index >= device_desc.bNumConfigurations)
 982                 return -EINVAL;
 983
 984         /* for now, don't advertise srp-only devices */
 985         if (!is_otg)
 986                 function++;
 987
 988         len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE,
 989                         function);
 990         if (len < 0)
 991                 return len;
 992         ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
 993         return len;
 994 }
 995
 996 /* Change our operational Interface. */
 997 static int
 998 set_interface(struct printer_dev *dev, unsigned number)
 999 {
1000         int                     result = 0;
1001
1002         if (gadget_is_sa1100(dev->gadget) && dev->interface < 0) {
1003                 /* tx fifo is full, but we can't clear it...*/
1004                 INFO(dev, "can't change interfaces\n");
1005                 return -ESPIPE;
1006         }
1007
1008         /* Free the current interface */
1009         switch (dev->interface) {
1010         case PRINTER_INTERFACE:
1011                 printer_reset_interface(dev);
1012                 break;
1013         }
1014
1015         switch (number) {
1016         case PRINTER_INTERFACE:
1017                 result = set_printer_interface(dev);
1018                 if (result) {
1019                         printer_reset_interface(dev);
1020                 } else {
1021                         dev->interface = PRINTER_INTERFACE;
1022                 }
1023                 break;
1024         default:
1025                 result = -EINVAL;
1026                 /* FALL THROUGH */
1027         }
1028
1029         if (!result)
1030                 INFO(dev, "Using interface %x\n", number);
1031
1032         return result;
1033 }
1034
1035 static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req)
1036 {
1037         if (req->status || req->actual != req->length)
1038                 DBG((struct printer_dev *) ep->driver_data,
1039                                 "setup complete --> %d, %d/%d\n",
1040                                 req->status, req->actual, req->length);
1041 }
1042
1043 static void printer_soft_reset(struct printer_dev *dev)
1044 {
1045         struct usb_request      *req;
1046
1047         INFO(dev, "Received Printer Reset Request\n");
1048
1049         if (usb_ep_disable(dev->in_ep))
1050                 DBG(dev, "Failed to disable USB in_ep\n");
1051         if (usb_ep_disable(dev->out_ep))
1052                 DBG(dev, "Failed to disable USB out_ep\n");
1053
1054         if (dev->current_rx_req != NULL) {
1055                 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
1056                 dev->current_rx_req = NULL;
1057         }
1058         dev->current_rx_bytes = 0;
1059         dev->current_rx_buf = NULL;
1060         dev->reset_printer = 1;
1061
1062         while (likely(!(list_empty(&dev->rx_buffers)))) {
1063                 req = container_of(dev->rx_buffers.next, struct usb_request,
1064                                 list);
1065                 list_del_init(&req->list);
1066                 list_add(&req->list, &dev->rx_reqs);
1067         }
1068
1069         while (likely(!(list_empty(&dev->rx_reqs_active)))) {
1070                 req = container_of(dev->rx_buffers.next, struct usb_request,
1071                                 list);
1072                 list_del_init(&req->list);
1073                 list_add(&req->list, &dev->rx_reqs);
1074         }
1075
1076         while (likely(!(list_empty(&dev->tx_reqs_active)))) {
1077                 req = container_of(dev->tx_reqs_active.next,
1078                                 struct usb_request, list);
1079                 list_del_init(&req->list);
1080                 list_add(&req->list, &dev->tx_reqs);
1081         }
1082
1083         if (usb_ep_enable(dev->in_ep, dev->in))
1084                 DBG(dev, "Failed to enable USB in_ep\n");
1085         if (usb_ep_enable(dev->out_ep, dev->out))
1086                 DBG(dev, "Failed to enable USB out_ep\n");
1087
1088         wake_up_interruptible(&dev->tx_wait);
1089         wake_up_interruptible(&dev->tx_flush_wait);
1090 }
1091
1092 /*-------------------------------------------------------------------------*/
1093
1094 /*
1095  * The setup() callback implements all the ep0 functionality that's not
1096  * handled lower down.
1097  */
1098 static int
1099 printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1100 {
1101         struct printer_dev      *dev = get_gadget_data(gadget);
1102         struct usb_request      *req = dev->req;
1103         int                     value = -EOPNOTSUPP;
1104         u16                     wIndex = le16_to_cpu(ctrl->wIndex);
1105         u16                     wValue = le16_to_cpu(ctrl->wValue);
1106         u16                     wLength = le16_to_cpu(ctrl->wLength);
1107
1108         DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
1109                 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
1110
1111         req->complete = printer_setup_complete;
1112
1113         switch (ctrl->bRequestType&USB_TYPE_MASK) {
1114
1115         case USB_TYPE_STANDARD:
1116                 switch (ctrl->bRequest) {
1117
1118                 case USB_REQ_GET_DESCRIPTOR:
1119                         if (ctrl->bRequestType != USB_DIR_IN)
1120                                 break;
1121                         switch (wValue >> 8) {
1122
1123                         case USB_DT_DEVICE:
1124                                 value = min(wLength, (u16) sizeof device_desc);
1125                                 memcpy(req->buf, &device_desc, value);
1126                                 break;
1127 #ifdef CONFIG_USB_GADGET_DUALSPEED
1128                         case USB_DT_DEVICE_QUALIFIER:
1129                                 if (!gadget->is_dualspeed)
1130                                         break;
1131                                 value = min(wLength,
1132                                                 (u16) sizeof dev_qualifier);
1133                                 memcpy(req->buf, &dev_qualifier, value);
1134                                 break;
1135
1136                         case USB_DT_OTHER_SPEED_CONFIG:
1137                                 if (!gadget->is_dualspeed)
1138                                         break;
1139                                 /* FALLTHROUGH */
1140 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1141                         case USB_DT_CONFIG:
1142                                 value = config_buf(gadget->speed, req->buf,
1143                                                 wValue >> 8,
1144                                                 wValue & 0xff,
1145                                                 gadget->is_otg);
1146                                 if (value >= 0)
1147                                         value = min(wLength, (u16) value);
1148                                 break;
1149
1150                         case USB_DT_STRING:
1151                                 value = usb_gadget_get_string(&stringtab,
1152                                                 wValue & 0xff, req->buf);
1153                                 if (value >= 0)
1154                                         value = min(wLength, (u16) value);
1155                                 break;
1156                         }
1157                         break;
1158
1159                 case USB_REQ_SET_CONFIGURATION:
1160                         if (ctrl->bRequestType != 0)
1161                                 break;
1162                         if (gadget->a_hnp_support)
1163                                 DBG(dev, "HNP available\n");
1164                         else if (gadget->a_alt_hnp_support)
1165                                 DBG(dev, "HNP needs a different root port\n");
1166                         value = printer_set_config(dev, wValue);
1167                         break;
1168                 case USB_REQ_GET_CONFIGURATION:
1169                         if (ctrl->bRequestType != USB_DIR_IN)
1170                                 break;
1171                         *(u8 *)req->buf = dev->config;
1172                         value = min(wLength, (u16) 1);
1173                         break;
1174
1175                 case USB_REQ_SET_INTERFACE:
1176                         if (ctrl->bRequestType != USB_RECIP_INTERFACE ||
1177                                         !dev->config)
1178                                 break;
1179
1180                         value = set_interface(dev, PRINTER_INTERFACE);
1181                         break;
1182                 case USB_REQ_GET_INTERFACE:
1183                         if (ctrl->bRequestType !=
1184                                         (USB_DIR_IN|USB_RECIP_INTERFACE)
1185                                         || !dev->config)
1186                                 break;
1187
1188                         *(u8 *)req->buf = dev->interface;
1189                         value = min(wLength, (u16) 1);
1190                         break;
1191
1192                 default:
1193                         goto unknown;
1194                 }
1195                 break;
1196
1197         case USB_TYPE_CLASS:
1198                 switch (ctrl->bRequest) {
1199                 case 0: /* Get the IEEE-1284 PNP String */
1200                         /* Only one printer interface is supported. */
1201                         if ((wIndex>>8) != PRINTER_INTERFACE)
1202                                 break;
1203
1204                         value = (pnp_string[0]<<8)|pnp_string[1];
1205                         memcpy(req->buf, pnp_string, value);
1206                         DBG(dev, "1284 PNP String: %x %s\n", value,
1207                                         &pnp_string[2]);
1208                         break;
1209
1210                 case 1: /* Get Port Status */
1211                         /* Only one printer interface is supported. */
1212                         if (wIndex != PRINTER_INTERFACE)
1213                                 break;
1214
1215                         *(u8 *)req->buf = dev->printer_status;
1216                         value = min(wLength, (u16) 1);
1217                         break;
1218
1219                 case 2: /* Soft Reset */
1220                         /* Only one printer interface is supported. */
1221                         if (wIndex != PRINTER_INTERFACE)
1222                                 break;
1223
1224                         printer_soft_reset(dev);
1225
1226                         value = 0;
1227                         break;
1228
1229                 default:
1230                         goto unknown;
1231                 }
1232                 break;
1233
1234         default:
1235 unknown:
1236                 VDBG(dev,
1237                         "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1238                         ctrl->bRequestType, ctrl->bRequest,
1239                         wValue, wIndex, wLength);
1240                 break;
1241         }
1242
1243         /* respond with data transfer before status phase? */
1244         if (value >= 0) {
1245                 req->length = value;
1246                 req->zero = value < wLength
1247                                 && (value % gadget->ep0->maxpacket) == 0;
1248                 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1249                 if (value < 0) {
1250                         DBG(dev, "ep_queue --> %d\n", value);
1251                         req->status = 0;
1252                         printer_setup_complete(gadget->ep0, req);
1253                 }
1254         }
1255
1256         /* host either stalls (value < 0) or reports success */
1257         return value;
1258 }
1259
1260 static void
1261 printer_disconnect(struct usb_gadget *gadget)
1262 {
1263         struct printer_dev      *dev = get_gadget_data(gadget);
1264         unsigned long           flags;
1265
1266         DBG(dev, "%s\n", __FUNCTION__);
1267
1268         spin_lock_irqsave(&dev->lock, flags);
1269
1270         printer_reset_interface(dev);
1271
1272         spin_unlock_irqrestore(&dev->lock, flags);
1273 }
1274
1275 static void
1276 printer_unbind(struct usb_gadget *gadget)
1277 {
1278         struct printer_dev      *dev = get_gadget_data(gadget);
1279         struct usb_request      *req;
1280
1281
1282         DBG(dev, "%s\n", __FUNCTION__);
1283
1284         /* Remove sysfs files */
1285         device_destroy(usb_gadget_class, g_printer_devno);
1286
1287         /* Remove Character Device */
1288         cdev_del(&dev->printer_cdev);
1289
1290         /* we must already have been disconnected ... no i/o may be active */
1291         WARN_ON(!list_empty(&dev->tx_reqs_active));
1292         WARN_ON(!list_empty(&dev->rx_reqs_active));
1293
1294         /* Free all memory for this driver. */
1295         while (!list_empty(&dev->tx_reqs)) {
1296                 req = container_of(dev->tx_reqs.next, struct usb_request,
1297                                 list);
1298                 list_del(&req->list);
1299                 printer_req_free(dev->in_ep, req);
1300         }
1301
1302         if (dev->current_rx_req != NULL);
1303                 printer_req_free(dev->out_ep, dev->current_rx_req);
1304
1305         while (!list_empty(&dev->rx_reqs)) {
1306                 req = container_of(dev->rx_reqs.next,
1307                                 struct usb_request, list);
1308                 list_del(&req->list);
1309                 printer_req_free(dev->out_ep, req);
1310         }
1311
1312         while (!list_empty(&dev->rx_buffers)) {
1313                 req = container_of(dev->rx_buffers.next,
1314                                 struct usb_request, list);
1315                 list_del(&req->list);
1316                 printer_req_free(dev->out_ep, req);
1317         }
1318
1319         if (dev->req) {
1320                 printer_req_free(gadget->ep0, dev->req);
1321                 dev->req = NULL;
1322         }
1323
1324         set_gadget_data(gadget, NULL);
1325 }
1326
1327 static int __init
1328 printer_bind(struct usb_gadget *gadget)
1329 {
1330         struct printer_dev      *dev;
1331         struct usb_ep           *in_ep, *out_ep;
1332         int                     status = -ENOMEM;
1333         int                     gcnum;
1334         size_t                  len;
1335         u32                     i;
1336         struct usb_request      *req;
1337
1338         dev = &usb_printer_gadget;
1339
1340
1341         /* Setup the sysfs files for the printer gadget. */
1342         dev->pdev = device_create(usb_gadget_class, NULL, g_printer_devno,
1343                         "g_printer");
1344         if (IS_ERR(dev->pdev)) {
1345                 ERROR(dev, "Failed to create device: g_printer\n");
1346                 goto fail;
1347         }
1348
1349         /*
1350          * Register a character device as an interface to a user mode
1351          * program that handles the printer specific functionality.
1352          */
1353         cdev_init(&dev->printer_cdev, &printer_io_operations);
1354         dev->printer_cdev.owner = THIS_MODULE;
1355         status = cdev_add(&dev->printer_cdev, g_printer_devno, 1);
1356         if (status) {
1357                 ERROR(dev, "Failed to open char device\n");
1358                 goto fail;
1359         }
1360
1361         if (gadget_is_sa1100(gadget)) {
1362                 /* hardware can't write zero length packets. */
1363                 ERROR(dev, "SA1100 controller is unsupport by this driver\n");
1364                 goto fail;
1365         }
1366
1367         gcnum = usb_gadget_controller_number(gadget);
1368         if (gcnum >= 0) {
1369                 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
1370         } else {
1371                 dev_warn(&gadget->dev, "controller '%s' not recognized\n",
1372                         gadget->name);
1373                 /* unrecognized, but safe unless bulk is REALLY quirky */
1374                 device_desc.bcdDevice =
1375                         __constant_cpu_to_le16(0xFFFF);
1376         }
1377         snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1378                 init_utsname()->sysname, init_utsname()->release,
1379                 gadget->name);
1380
1381         device_desc.idVendor =
1382                 __constant_cpu_to_le16(PRINTER_VENDOR_NUM);
1383         device_desc.idProduct =
1384                 __constant_cpu_to_le16(PRINTER_PRODUCT_NUM);
1385
1386         /* support optional vendor/distro customization */
1387         if (idVendor) {
1388                 if (!idProduct) {
1389                         dev_err(&gadget->dev, "idVendor needs idProduct!\n");
1390                         return -ENODEV;
1391                 }
1392                 device_desc.idVendor = cpu_to_le16(idVendor);
1393                 device_desc.idProduct = cpu_to_le16(idProduct);
1394                 if (bcdDevice)
1395                         device_desc.bcdDevice = cpu_to_le16(bcdDevice);
1396         }
1397
1398         if (iManufacturer)
1399                 strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
1400
1401         if (iProduct)
1402                 strlcpy(product_desc, iProduct, sizeof product_desc);
1403
1404         if (iSerialNum)
1405                 strlcpy(serial_num, iSerialNum, sizeof serial_num);
1406
1407         if (iPNPstring)
1408                 strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2);
1409
1410         len = strlen(pnp_string);
1411         pnp_string[0] = (len >> 8) & 0xFF;
1412         pnp_string[1] = len & 0xFF;
1413
1414         /* all we really need is bulk IN/OUT */
1415         usb_ep_autoconfig_reset(gadget);
1416         in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc);
1417         if (!in_ep) {
1418 autoconf_fail:
1419                 dev_err(&gadget->dev, "can't autoconfigure on %s\n",
1420                         gadget->name);
1421                 return -ENODEV;
1422         }
1423         in_ep->driver_data = in_ep;     /* claim */
1424
1425         out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc);
1426         if (!out_ep)
1427                 goto autoconf_fail;
1428         out_ep->driver_data = out_ep;   /* claim */
1429
1430 #ifdef  CONFIG_USB_GADGET_DUALSPEED
1431         /* assumes ep0 uses the same value for both speeds ... */
1432         dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
1433
1434         /* and that all endpoints are dual-speed */
1435         hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1436         hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1437 #endif  /* DUALSPEED */
1438
1439         device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1440         usb_gadget_set_selfpowered(gadget);
1441
1442         if (gadget->is_otg) {
1443                 otg_desc.bmAttributes |= USB_OTG_HNP,
1444                 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1445                 config_desc.bMaxPower = 4;
1446         }
1447
1448         spin_lock_init(&dev->lock);
1449         spin_lock_init(&dev->lock_printer_io);
1450         INIT_LIST_HEAD(&dev->tx_reqs);
1451         INIT_LIST_HEAD(&dev->tx_reqs_active);
1452         INIT_LIST_HEAD(&dev->rx_reqs);
1453         INIT_LIST_HEAD(&dev->rx_reqs_active);
1454         INIT_LIST_HEAD(&dev->rx_buffers);
1455         init_waitqueue_head(&dev->rx_wait);
1456         init_waitqueue_head(&dev->tx_wait);
1457         init_waitqueue_head(&dev->tx_flush_wait);
1458
1459         dev->config = 0;
1460         dev->interface = -1;
1461         dev->printer_cdev_open = 0;
1462         dev->printer_status = PRINTER_NOT_ERROR;
1463         dev->current_rx_req = NULL;
1464         dev->current_rx_bytes = 0;
1465         dev->current_rx_buf = NULL;
1466
1467         dev->in_ep = in_ep;
1468         dev->out_ep = out_ep;
1469
1470         /* preallocate control message data and buffer */
1471         dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE,
1472                         GFP_KERNEL);
1473         if (!dev->req) {
1474                 status = -ENOMEM;
1475                 goto fail;
1476         }
1477
1478         for (i = 0; i < QLEN; i++) {
1479                 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1480                 if (!req) {
1481                         while (!list_empty(&dev->tx_reqs)) {
1482                                 req = container_of(dev->tx_reqs.next,
1483                                                 struct usb_request, list);
1484                                 list_del(&req->list);
1485                                 printer_req_free(dev->in_ep, req);
1486                         }
1487                         return -ENOMEM;
1488                 }
1489                 list_add(&req->list, &dev->tx_reqs);
1490         }
1491
1492         for (i = 0; i < QLEN; i++) {
1493                 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1494                 if (!req) {
1495                         while (!list_empty(&dev->rx_reqs)) {
1496                                 req = container_of(dev->rx_reqs.next,
1497                                                 struct usb_request, list);
1498                                 list_del(&req->list);
1499                                 printer_req_free(dev->out_ep, req);
1500                         }
1501                         return -ENOMEM;
1502                 }
1503                 list_add(&req->list, &dev->rx_reqs);
1504         }
1505
1506         dev->req->complete = printer_setup_complete;
1507
1508         /* finish hookup to lower layer ... */
1509         dev->gadget = gadget;
1510         set_gadget_data(gadget, dev);
1511         gadget->ep0->driver_data = dev;
1512
1513         INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
1514         INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name,
1515                         in_ep->name);
1516
1517         return 0;
1518
1519 fail:
1520         printer_unbind(gadget);
1521         return status;
1522 }
1523
1524 /*-------------------------------------------------------------------------*/
1525
1526 static struct usb_gadget_driver printer_driver = {
1527         .speed          = DEVSPEED,
1528
1529         .function       = (char *) driver_desc,
1530         .bind           = printer_bind,
1531         .unbind         = printer_unbind,
1532
1533         .setup          = printer_setup,
1534         .disconnect     = printer_disconnect,
1535
1536         .driver         = {
1537                 .name           = (char *) shortname,
1538                 .owner          = THIS_MODULE,
1539         },
1540 };
1541
1542 MODULE_DESCRIPTION(DRIVER_DESC);
1543 MODULE_AUTHOR("Craig Nadler");
1544 MODULE_LICENSE("GPL");
1545
1546 static int __init
1547 init(void)
1548 {
1549         int status;
1550
1551         usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1552         if (IS_ERR(usb_gadget_class)) {
1553                 status = PTR_ERR(usb_gadget_class);
1554                 ERROR(dev, "unable to create usb_gadget class %d\n", status);
1555                 return status;
1556         }
1557
1558         status = alloc_chrdev_region(&g_printer_devno, 0, 1,
1559                         "USB printer gadget");
1560         if (status) {
1561                 ERROR(dev, "alloc_chrdev_region %d\n", status);
1562                 class_destroy(usb_gadget_class);
1563                 return status;
1564         }
1565
1566         status = usb_gadget_register_driver(&printer_driver);
1567         if (status) {
1568                 class_destroy(usb_gadget_class);
1569                 unregister_chrdev_region(g_printer_devno, 1);
1570                 DBG(dev, "usb_gadget_register_driver %x\n", status);
1571         }
1572
1573         return status;
1574 }
1575 module_init(init);
1576
1577 static void __exit
1578 cleanup(void)
1579 {
1580         int status;
1581
1582         spin_lock(&usb_printer_gadget.lock_printer_io);
1583         class_destroy(usb_gadget_class);
1584         unregister_chrdev_region(g_printer_devno, 2);
1585
1586         status = usb_gadget_unregister_driver(&printer_driver);
1587         if (status)
1588                 ERROR(dev, "usb_gadget_unregister_driver %x\n", status);
1589
1590         spin_unlock(&usb_printer_gadget.lock_printer_io);
1591 }
1592 module_exit(cleanup);