drivers/usb/gadget/printer.c

   1 /*
   2  * printer.c -- Printer gadget driver
   3  *
   4  * Copyright (C) 2003-2005 David Brownell
   5  * Copyright (C) 2006 Craig W. Nadler
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/delay.h>
  25 #include <linux/ioport.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/errno.h>
  30 #include <linux/init.h>
  31 #include <linux/timer.h>
  32 #include <linux/list.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/utsname.h>
  35 #include <linux/device.h>
  36 #include <linux/moduleparam.h>
  37 #include <linux/fs.h>
  38 #include <linux/poll.h>
  39 #include <linux/types.h>
  40 #include <linux/ctype.h>
  41 #include <linux/cdev.h>
  42
  43 #include <asm/byteorder.h>
  44 #include <linux/io.h>
  45 #include <linux/irq.h>
  46 #include <asm/system.h>
  47 #include <linux/uaccess.h>
  48 #include <asm/unaligned.h>
  49
  50 #include <linux/usb/ch9.h>
  51 #include <linux/usb/gadget.h>
  52 #include <linux/usb/g_printer.h>
  53
  54 #include "gadget_chips.h"
  55
  56 #define DRIVER_DESC             "Printer Gadget"
  57 #define DRIVER_VERSION          "2007 OCT 06"
  58
  59 static const char shortname [] = "printer";
  60 static const char driver_desc [] = DRIVER_DESC;
  61
  62 static dev_t g_printer_devno;
  63
  64 static struct class *usb_gadget_class;
  65
  66 /*-------------------------------------------------------------------------*/
  67
  68 struct printer_dev {
  69         spinlock_t              lock;           /* lock this structure */
  70         /* lock buffer lists during read/write calls */
  71         spinlock_t              lock_printer_io;
  72         struct usb_gadget       *gadget;
  73         struct usb_request      *req;           /* for control responses */
  74         u8                      config;
  75         s8                      interface;
  76         struct usb_ep           *in_ep, *out_ep;
  77         const struct usb_endpoint_descriptor
  78                                 *in, *out;
  79         struct list_head        rx_reqs;        /* List of free RX structs */
  80         struct list_head        rx_reqs_active; /* List of Active RX xfers */
  81         struct list_head        rx_buffers;     /* List of completed xfers */
  82         /* wait until there is data to be read. */
  83         wait_queue_head_t       rx_wait;
  84         struct list_head        tx_reqs;        /* List of free TX structs */
  85         struct list_head        tx_reqs_active; /* List of Active TX xfers */
  86         /* Wait until there are write buffers available to use. */
  87         wait_queue_head_t       tx_wait;
  88         /* Wait until all write buffers have been sent. */
  89         wait_queue_head_t       tx_flush_wait;
  90         struct usb_request      *current_rx_req;
  91         size_t                  current_rx_bytes;
  92         u8                      *current_rx_buf;
  93         u8                      printer_status;
  94         u8                      reset_printer;
  95         struct cdev             printer_cdev;
  96         struct device           *pdev;
  97         u8                      printer_cdev_open;
  98         wait_queue_head_t       wait;
  99 };
 100
 101 static struct printer_dev usb_printer_gadget;
 102
 103 /*-------------------------------------------------------------------------*/
 104
 105 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 106  * Instead:  allocate your own, using normal USB-IF procedures.
 107  */
 108
 109 /* Thanks to NetChip Technologies for donating this product ID.
 110  */
 111 #define PRINTER_VENDOR_NUM      0x0525          /* NetChip */
 112 #define PRINTER_PRODUCT_NUM     0xa4a8          /* Linux-USB Printer Gadget */
 113
 114 /* Some systems will want different product identifers published in the
 115  * device descriptor, either numbers or strings or both.  These string
 116  * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
 117  */
 118
 119 static ushort __initdata idVendor;
 120 module_param(idVendor, ushort, S_IRUGO);
 121 MODULE_PARM_DESC(idVendor, "USB Vendor ID");
 122
 123 static ushort __initdata idProduct;
 124 module_param(idProduct, ushort, S_IRUGO);
 125 MODULE_PARM_DESC(idProduct, "USB Product ID");
 126
 127 static ushort __initdata bcdDevice;
 128 module_param(bcdDevice, ushort, S_IRUGO);
 129 MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
 130
 131 static char *__initdata iManufacturer;
 132 module_param(iManufacturer, charp, S_IRUGO);
 133 MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
 134
 135 static char *__initdata iProduct;
 136 module_param(iProduct, charp, S_IRUGO);
 137 MODULE_PARM_DESC(iProduct, "USB Product string");
 138
 139 static char *__initdata iSerialNum;
 140 module_param(iSerialNum, charp, S_IRUGO);
 141 MODULE_PARM_DESC(iSerialNum, "1");
 142
 143 static char *__initdata iPNPstring;
 144 module_param(iPNPstring, charp, S_IRUGO);
 145 MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
 146
 147 /* Number of requests to allocate per endpoint, not used for ep0. */
 148 static unsigned qlen = 10;
 149 module_param(qlen, uint, S_IRUGO|S_IWUSR);
 150
 151 #define QLEN    qlen
 152
 153 #ifdef CONFIG_USB_GADGET_DUALSPEED
 154 #define DEVSPEED        USB_SPEED_HIGH
 155 #else   /* full speed (low speed doesn't do bulk) */
 156 #define DEVSPEED        USB_SPEED_FULL
 157 #endif
 158
 159 /*-------------------------------------------------------------------------*/
 160
 161 #define xprintk(d, level, fmt, args...) \
 162         printk(level "%s: " fmt, DRIVER_DESC, ## args)
 163
 164 #ifdef DEBUG
 165 #define DBG(dev, fmt, args...) \
 166         xprintk(dev, KERN_DEBUG, fmt, ## args)
 167 #else
 168 #define DBG(dev, fmt, args...) \
 169         do { } while (0)
 170 #endif /* DEBUG */
 171
 172 #ifdef VERBOSE
 173 #define VDBG(dev, fmt, args...) \
 174         xprintk(dev, KERN_DEBUG, fmt, ## args)
 175 #else
 176 #define VDBG(dev, fmt, args...) \
 177         do { } while (0)
 178 #endif /* VERBOSE */
 179
 180 #define ERROR(dev, fmt, args...) \
 181         xprintk(dev, KERN_ERR, fmt, ## args)
 182 #define WARN(dev, fmt, args...) \
 183         xprintk(dev, KERN_WARNING, fmt, ## args)
 184 #define INFO(dev, fmt, args...) \
 185         xprintk(dev, KERN_INFO, fmt, ## args)
 186
 187 /*-------------------------------------------------------------------------*/
 188
 189 /* USB DRIVER HOOKUP (to the hardware driver, below us), mostly
 190  * ep0 implementation:  descriptors, config management, setup().
 191  * also optional class-specific notification interrupt transfer.
 192  */
 193
 194 /*
 195  * DESCRIPTORS ... most are static, but strings and (full) configuration
 196  * descriptors are built on demand.
 197  */
 198
 199 #define STRING_MANUFACTURER             1
 200 #define STRING_PRODUCT                  2
 201 #define STRING_SERIALNUM                3
 202
 203 /* holds our biggest descriptor */
 204 #define USB_DESC_BUFSIZE                256
 205 #define USB_BUFSIZE                     8192
 206
 207 /* This device advertises one configuration. */
 208 #define DEV_CONFIG_VALUE                1
 209 #define PRINTER_INTERFACE               0
 210
 211 static struct usb_device_descriptor device_desc = {
 212         .bLength =              sizeof device_desc,
 213         .bDescriptorType =      USB_DT_DEVICE,
 214         .bcdUSB =               __constant_cpu_to_le16(0x0200),
 215         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
 216         .bDeviceSubClass =      0,
 217         .bDeviceProtocol =      0,
 218         .idVendor =             __constant_cpu_to_le16(PRINTER_VENDOR_NUM),
 219         .idProduct =            __constant_cpu_to_le16(PRINTER_PRODUCT_NUM),
 220         .iManufacturer =        STRING_MANUFACTURER,
 221         .iProduct =             STRING_PRODUCT,
 222         .iSerialNumber =        STRING_SERIALNUM,
 223         .bNumConfigurations =   1
 224 };
 225
 226 static struct usb_otg_descriptor otg_desc = {
 227         .bLength =              sizeof otg_desc,
 228         .bDescriptorType =      USB_DT_OTG,
 229         .bmAttributes =         USB_OTG_SRP
 230 };
 231
 232 static struct usb_config_descriptor config_desc = {
 233         .bLength =              sizeof config_desc,
 234         .bDescriptorType =      USB_DT_CONFIG,
 235
 236         /* compute wTotalLength on the fly */
 237         .bNumInterfaces =       1,
 238         .bConfigurationValue =  DEV_CONFIG_VALUE,
 239         .iConfiguration =       0,
 240         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 241         .bMaxPower =            1       /* Self-Powered */
 242 };
 243
 244 static struct usb_interface_descriptor intf_desc = {
 245         .bLength =              sizeof intf_desc,
 246         .bDescriptorType =      USB_DT_INTERFACE,
 247         .bInterfaceNumber =     PRINTER_INTERFACE,
 248         .bNumEndpoints =        2,
 249         .bInterfaceClass =      USB_CLASS_PRINTER,
 250         .bInterfaceSubClass =   1,      /* Printer Sub-Class */
 251         .bInterfaceProtocol =   2,      /* Bi-Directional */
 252         .iInterface =           0
 253 };
 254
 255 static struct usb_endpoint_descriptor fs_ep_in_desc = {
 256         .bLength =              USB_DT_ENDPOINT_SIZE,
 257         .bDescriptorType =      USB_DT_ENDPOINT,
 258         .bEndpointAddress =     USB_DIR_IN,
 259         .bmAttributes =         USB_ENDPOINT_XFER_BULK
 260 };
 261
 262 static struct usb_endpoint_descriptor fs_ep_out_desc = {
 263         .bLength =              USB_DT_ENDPOINT_SIZE,
 264         .bDescriptorType =      USB_DT_ENDPOINT,
 265         .bEndpointAddress =     USB_DIR_OUT,
 266         .bmAttributes =         USB_ENDPOINT_XFER_BULK
 267 };
 268
 269 static const struct usb_descriptor_header *fs_printer_function [11] = {
 270         (struct usb_descriptor_header *) &otg_desc,
 271         (struct usb_descriptor_header *) &intf_desc,
 272         (struct usb_descriptor_header *) &fs_ep_in_desc,
 273         (struct usb_descriptor_header *) &fs_ep_out_desc,
 274         NULL
 275 };
 276
 277 #ifdef  CONFIG_USB_GADGET_DUALSPEED
 278
 279 /*
 280  * usb 2.0 devices need to expose both high speed and full speed
 281  * descriptors, unless they only run at full speed.
 282  */
 283
 284 static struct usb_endpoint_descriptor hs_ep_in_desc = {
 285         .bLength =              USB_DT_ENDPOINT_SIZE,
 286         .bDescriptorType =      USB_DT_ENDPOINT,
 287         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 288         .wMaxPacketSize =       __constant_cpu_to_le16(512)
 289 };
 290
 291 static struct usb_endpoint_descriptor hs_ep_out_desc = {
 292         .bLength =              USB_DT_ENDPOINT_SIZE,
 293         .bDescriptorType =      USB_DT_ENDPOINT,
 294         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 295         .wMaxPacketSize =       __constant_cpu_to_le16(512)
 296 };
 297
 298 static struct usb_qualifier_descriptor dev_qualifier = {
 299         .bLength =              sizeof dev_qualifier,
 300         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
 301         .bcdUSB =               __constant_cpu_to_le16(0x0200),
 302         .bDeviceClass =         USB_CLASS_PRINTER,
 303         .bNumConfigurations =   1
 304 };
 305
 306 static const struct usb_descriptor_header *hs_printer_function [11] = {
 307         (struct usb_descriptor_header *) &otg_desc,
 308         (struct usb_descriptor_header *) &intf_desc,
 309         (struct usb_descriptor_header *) &hs_ep_in_desc,
 310         (struct usb_descriptor_header *) &hs_ep_out_desc,
 311         NULL
 312 };
 313
 314 /* maxpacket and other transfer characteristics vary by speed. */
 315 #define ep_desc(g, hs, fs) (((g)->speed == USB_SPEED_HIGH)?(hs):(fs))
 316
 317 #else
 318
 319 /* if there's no high speed support, maxpacket doesn't change. */
 320 #define ep_desc(g, hs, fs) (((void)(g)), (fs))
 321
 322 #endif  /* !CONFIG_USB_GADGET_DUALSPEED */
 323
 324 /*-------------------------------------------------------------------------*/
 325
 326 /* descriptors that are built on-demand */
 327
 328 static char                             manufacturer [50];
 329 static char                             product_desc [40] = DRIVER_DESC;
 330 static char                             serial_num [40] = "1";
 331 static char                             pnp_string [1024] =
 332         "XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
 333
 334 /* static strings, in UTF-8 */
 335 static struct usb_string                strings [] = {
 336         { STRING_MANUFACTURER,  manufacturer, },
 337         { STRING_PRODUCT,       product_desc, },
 338         { STRING_SERIALNUM,     serial_num, },
 339         {  }            /* end of list */
 340 };
 341
 342 static struct usb_gadget_strings        stringtab = {
 343         .language       = 0x0409,       /* en-us */
 344         .strings        = strings,
 345 };
 346
 347 /*-------------------------------------------------------------------------*/
 348
 349 static struct usb_request *
 350 printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
 351 {
 352         struct usb_request      *req;
 353
 354         req = usb_ep_alloc_request(ep, gfp_flags);
 355
 356         if (req != NULL) {
 357                 req->length = len;
 358                 req->buf = kmalloc(len, gfp_flags);
 359                 if (req->buf == NULL) {
 360                         usb_ep_free_request(ep, req);
 361                         return NULL;
 362                 }
 363         }
 364
 365         return req;
 366 }
 367
 368 static void
 369 printer_req_free(struct usb_ep *ep, struct usb_request *req)
 370 {
 371         if (ep != NULL && req != NULL) {
 372                 kfree(req->buf);
 373                 usb_ep_free_request(ep, req);
 374         }
 375 }
 376
 377 /*-------------------------------------------------------------------------*/
 378
 379 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
 380 {
 381         struct printer_dev      *dev = ep->driver_data;
 382         int                     status = req->status;
 383         unsigned long           flags;
 384
 385         spin_lock_irqsave(&dev->lock, flags);
 386
 387         list_del_init(&req->list);      /* Remode from Active List */
 388
 389         switch (status) {
 390
 391         /* normal completion */
 392         case 0:
 393                 if (req->actual > 0) {
 394                         list_add_tail(&req->list, &dev->rx_buffers);
 395                         DBG(dev, "G_Printer : rx length %d\n", req->actual);
 396                 } else {
 397                         list_add(&req->list, &dev->rx_reqs);
 398                 }
 399                 break;
 400
 401         /* software-driven interface shutdown */
 402         case -ECONNRESET:               /* unlink */
 403         case -ESHUTDOWN:                /* disconnect etc */
 404                 VDBG(dev, "rx shutdown, code %d\n", status);
 405                 list_add(&req->list, &dev->rx_reqs);
 406                 break;
 407
 408         /* for hardware automagic (such as pxa) */
 409         case -ECONNABORTED:             /* endpoint reset */
 410                 DBG(dev, "rx %s reset\n", ep->name);
 411                 list_add(&req->list, &dev->rx_reqs);
 412                 break;
 413
 414         /* data overrun */
 415         case -EOVERFLOW:
 416                 /* FALLTHROUGH */
 417
 418         default:
 419                 DBG(dev, "rx status %d\n", status);
 420                 list_add(&req->list, &dev->rx_reqs);
 421                 break;
 422         }
 423
 424         wake_up_interruptible(&dev->rx_wait);
 425         spin_unlock_irqrestore(&dev->lock, flags);
 426 }
 427
 428 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
 429 {
 430         struct printer_dev      *dev = ep->driver_data;
 431
 432         switch (req->status) {
 433         default:
 434                 VDBG(dev, "tx err %d\n", req->status);
 435                 /* FALLTHROUGH */
 436         case -ECONNRESET:               /* unlink */
 437         case -ESHUTDOWN:                /* disconnect etc */
 438                 break;
 439         case 0:
 440                 break;
 441         }
 442
 443         spin_lock(&dev->lock);
 444         /* Take the request struct off the active list and put it on the
 445          * free list.
 446          */
 447         list_del_init(&req->list);
 448         list_add(&req->list, &dev->tx_reqs);
 449         wake_up_interruptible(&dev->tx_wait);
 450         if (likely(list_empty(&dev->tx_reqs_active)))
 451                 wake_up_interruptible(&dev->tx_flush_wait);
 452
 453         spin_unlock(&dev->lock);
 454 }
 455
 456 /*-------------------------------------------------------------------------*/
 457
 458 static int
 459 printer_open(struct inode *inode, struct file *fd)
 460 {
 461         struct printer_dev      *dev;
 462         unsigned long           flags;
 463         int                     ret = -EBUSY;
 464
 465         lock_kernel();
 466         dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
 467
 468         spin_lock_irqsave(&dev->lock, flags);
 469
 470         if (!dev->printer_cdev_open) {
 471                 dev->printer_cdev_open = 1;
 472                 fd->private_data = dev;
 473                 ret = 0;
 474                 /* Change the printer status to show that it's on-line. */
 475                 dev->printer_status |= PRINTER_SELECTED;
 476         }
 477
 478         spin_unlock_irqrestore(&dev->lock, flags);
 479
 480         DBG(dev, "printer_open returned %x\n", ret);
 481         unlock_kernel();
 482         return ret;
 483 }
 484
 485 static int
 486 printer_close(struct inode *inode, struct file *fd)
 487 {
 488         struct printer_dev      *dev = fd->private_data;
 489         unsigned long           flags;
 490
 491         spin_lock_irqsave(&dev->lock, flags);
 492         dev->printer_cdev_open = 0;
 493         fd->private_data = NULL;
 494         /* Change printer status to show that the printer is off-line. */
 495         dev->printer_status &= ~PRINTER_SELECTED;
 496         spin_unlock_irqrestore(&dev->lock, flags);
 497
 498         DBG(dev, "printer_close\n");
 499
 500         return 0;
 501 }
 502
 503 /* This function must be called with interrupts turned off. */
 504 static void
 505 setup_rx_reqs(struct printer_dev *dev)
 506 {
 507         struct usb_request              *req;
 508
 509         while (likely(!list_empty(&dev->rx_reqs))) {
 510                 int error;
 511
 512                 req = container_of(dev->rx_reqs.next,
 513                                 struct usb_request, list);
 514                 list_del_init(&req->list);
 515
 516                 /* The USB Host sends us whatever amount of data it wants to
 517                  * so we always set the length field to the full USB_BUFSIZE.
 518                  * If the amount of data is more than the read() caller asked
 519                  * for it will be stored in the request buffer until it is
 520                  * asked for by read().
 521                  */
 522                 req->length = USB_BUFSIZE;
 523                 req->complete = rx_complete;
 524
 525                 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
 526                 if (error) {
 527                         DBG(dev, "rx submit --> %d\n", error);
 528                         list_add(&req->list, &dev->rx_reqs);
 529                         break;
 530                 } else {
 531                         list_add(&req->list, &dev->rx_reqs_active);
 532                 }
 533         }
 534 }
 535
 536 static ssize_t
 537 printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
 538 {
 539         struct printer_dev              *dev = fd->private_data;
 540         unsigned long                   flags;
 541         size_t                          size;
 542         size_t                          bytes_copied;
 543         struct usb_request              *req;
 544         /* This is a pointer to the current USB rx request. */
 545         struct usb_request              *current_rx_req;
 546         /* This is the number of bytes in the current rx buffer. */
 547         size_t                          current_rx_bytes;
 548         /* This is a pointer to the current rx buffer. */
 549         u8                              *current_rx_buf;
 550
 551         if (len == 0)
 552                 return -EINVAL;
 553
 554         DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
 555
 556         spin_lock(&dev->lock_printer_io);
 557         spin_lock_irqsave(&dev->lock, flags);
 558
 559         /* We will use this flag later to check if a printer reset happened
 560          * after we turn interrupts back on.
 561          */
 562         dev->reset_printer = 0;
 563
 564         setup_rx_reqs(dev);
 565
 566         bytes_copied = 0;
 567         current_rx_req = dev->current_rx_req;
 568         current_rx_bytes = dev->current_rx_bytes;
 569         current_rx_buf = dev->current_rx_buf;
 570         dev->current_rx_req = NULL;
 571         dev->current_rx_bytes = 0;
 572         dev->current_rx_buf = NULL;
 573
 574         /* Check if there is any data in the read buffers. Please note that
 575          * current_rx_bytes is the number of bytes in the current rx buffer.
 576          * If it is zero then check if there are any other rx_buffers that
 577          * are on the completed list. We are only out of data if all rx
 578          * buffers are empty.
 579          */
 580         if ((current_rx_bytes == 0) &&
 581                         (likely(list_empty(&dev->rx_buffers)))) {
 582                 /* Turn interrupts back on before sleeping. */
 583                 spin_unlock_irqrestore(&dev->lock, flags);
 584
 585                 /*
 586                  * If no data is available check if this is a NON-Blocking
 587                  * call or not.
 588                  */
 589                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 590                         spin_unlock(&dev->lock_printer_io);
 591                         return -EAGAIN;
 592                 }
 593
 594                 /* Sleep until data is available */
 595                 wait_event_interruptible(dev->rx_wait,
 596                                 (likely(!list_empty(&dev->rx_buffers))));
 597                 spin_lock_irqsave(&dev->lock, flags);
 598         }
 599
 600         /* We have data to return then copy it to the caller's buffer.*/
 601         while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
 602                         && len) {
 603                 if (current_rx_bytes == 0) {
 604                         req = container_of(dev->rx_buffers.next,
 605                                         struct usb_request, list);
 606                         list_del_init(&req->list);
 607
 608                         if (req->actual && req->buf) {
 609                                 current_rx_req = req;
 610                                 current_rx_bytes = req->actual;
 611                                 current_rx_buf = req->buf;
 612                         } else {
 613                                 list_add(&req->list, &dev->rx_reqs);
 614                                 continue;
 615                         }
 616                 }
 617
 618                 /* Don't leave irqs off while doing memory copies */
 619                 spin_unlock_irqrestore(&dev->lock, flags);
 620
 621                 if (len > current_rx_bytes)
 622                         size = current_rx_bytes;
 623                 else
 624                         size = len;
 625
 626                 size -= copy_to_user(buf, current_rx_buf, size);
 627                 bytes_copied += size;
 628                 len -= size;
 629                 buf += size;
 630
 631                 spin_lock_irqsave(&dev->lock, flags);
 632
 633                 /* We've disconnected or reset so return. */
 634                 if (dev->reset_printer) {
 635                         list_add(&current_rx_req->list, &dev->rx_reqs);
 636                         spin_unlock_irqrestore(&dev->lock, flags);
 637                         spin_unlock(&dev->lock_printer_io);
 638                         return -EAGAIN;
 639                 }
 640
 641                 /* If we not returning all the data left in this RX request
 642                  * buffer then adjust the amount of data left in the buffer.
 643                  * Othewise if we are done with this RX request buffer then
 644                  * requeue it to get any incoming data from the USB host.
 645                  */
 646                 if (size < current_rx_bytes) {
 647                         current_rx_bytes -= size;
 648                         current_rx_buf += size;
 649                 } else {
 650                         list_add(&current_rx_req->list, &dev->rx_reqs);
 651                         current_rx_bytes = 0;
 652                         current_rx_buf = NULL;
 653                         current_rx_req = NULL;
 654                 }
 655         }
 656
 657         dev->current_rx_req = current_rx_req;
 658         dev->current_rx_bytes = current_rx_bytes;
 659         dev->current_rx_buf = current_rx_buf;
 660
 661         spin_unlock_irqrestore(&dev->lock, flags);
 662         spin_unlock(&dev->lock_printer_io);
 663
 664         DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
 665
 666         if (bytes_copied)
 667                 return bytes_copied;
 668         else
 669                 return -EAGAIN;
 670 }
 671
 672 static ssize_t
 673 printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 674 {
 675         struct printer_dev      *dev = fd->private_data;
 676         unsigned long           flags;
 677         size_t                  size;   /* Amount of data in a TX request. */
 678         size_t                  bytes_copied = 0;
 679         struct usb_request      *req;
 680
 681         DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
 682
 683         if (len == 0)
 684                 return -EINVAL;
 685
 686         spin_lock(&dev->lock_printer_io);
 687         spin_lock_irqsave(&dev->lock, flags);
 688
 689         /* Check if a printer reset happens while we have interrupts on */
 690         dev->reset_printer = 0;
 691
 692         /* Check if there is any available write buffers */
 693         if (likely(list_empty(&dev->tx_reqs))) {
 694                 /* Turn interrupts back on before sleeping. */
 695                 spin_unlock_irqrestore(&dev->lock, flags);
 696
 697                 /*
 698                  * If write buffers are available check if this is
 699                  * a NON-Blocking call or not.
 700                  */
 701                 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
 702                         spin_unlock(&dev->lock_printer_io);
 703                         return -EAGAIN;
 704                 }
 705
 706                 /* Sleep until a write buffer is available */
 707                 wait_event_interruptible(dev->tx_wait,
 708                                 (likely(!list_empty(&dev->tx_reqs))));
 709                 spin_lock_irqsave(&dev->lock, flags);
 710         }
 711
 712         while (likely(!list_empty(&dev->tx_reqs)) && len) {
 713
 714                 if (len > USB_BUFSIZE)
 715                         size = USB_BUFSIZE;
 716                 else
 717                         size = len;
 718
 719                 req = container_of(dev->tx_reqs.next, struct usb_request,
 720                                 list);
 721                 list_del_init(&req->list);
 722
 723                 req->complete = tx_complete;
 724                 req->length = size;
 725
 726                 /* Check if we need to send a zero length packet. */
 727                 if (len > size)
 728                         /* They will be more TX requests so no yet. */
 729                         req->zero = 0;
 730                 else
 731                         /* If the data amount is not a multple of the
 732                          * maxpacket size then send a zero length packet.
 733                          */
 734                         req->zero = ((len % dev->in_ep->maxpacket) == 0);
 735
 736                 /* Don't leave irqs off while doing memory copies */
 737                 spin_unlock_irqrestore(&dev->lock, flags);
 738
 739                 if (copy_from_user(req->buf, buf, size)) {
 740                         list_add(&req->list, &dev->tx_reqs);
 741                         spin_unlock(&dev->lock_printer_io);
 742                         return bytes_copied;
 743                 }
 744
 745                 bytes_copied += size;
 746                 len -= size;
 747                 buf += size;
 748
 749                 spin_lock_irqsave(&dev->lock, flags);
 750
 751                 /* We've disconnected or reset so free the req and buffer */
 752                 if (dev->reset_printer) {
 753                         list_add(&req->list, &dev->tx_reqs);
 754                         spin_unlock_irqrestore(&dev->lock, flags);
 755                         spin_unlock(&dev->lock_printer_io);
 756                         return -EAGAIN;
 757                 }
 758
 759                 if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
 760                         list_add(&req->list, &dev->tx_reqs);
 761                         spin_unlock_irqrestore(&dev->lock, flags);
 762                         spin_unlock(&dev->lock_printer_io);
 763                         return -EAGAIN;
 764                 }
 765
 766                 list_add(&req->list, &dev->tx_reqs_active);
 767
 768         }
 769
 770         spin_unlock_irqrestore(&dev->lock, flags);
 771         spin_unlock(&dev->lock_printer_io);
 772
 773         DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
 774
 775         if (bytes_copied) {
 776                 return bytes_copied;
 777         } else {
 778                 return -EAGAIN;
 779         }
 780 }
 781
 782 static int
 783 printer_fsync(struct file *fd, struct dentry *dentry, int datasync)
 784 {
 785         struct printer_dev      *dev = fd->private_data;
 786         unsigned long           flags;
 787         int                     tx_list_empty;
 788
 789         spin_lock_irqsave(&dev->lock, flags);
 790         tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
 791         spin_unlock_irqrestore(&dev->lock, flags);
 792
 793         if (!tx_list_empty) {
 794                 /* Sleep until all data has been sent */
 795                 wait_event_interruptible(dev->tx_flush_wait,
 796                                 (likely(list_empty(&dev->tx_reqs_active))));
 797         }
 798
 799         return 0;
 800 }
 801
 802 static unsigned int
 803 printer_poll(struct file *fd, poll_table *wait)
 804 {
 805         struct printer_dev      *dev = fd->private_data;
 806         unsigned long           flags;
 807         int                     status = 0;
 808
 809         spin_lock(&dev->lock_printer_io);
 810         spin_lock_irqsave(&dev->lock, flags);
 811         setup_rx_reqs(dev);
 812         spin_unlock_irqrestore(&dev->lock, flags);
 813         spin_unlock(&dev->lock_printer_io);
 814
 815         poll_wait(fd, &dev->rx_wait, wait);
 816         poll_wait(fd, &dev->tx_wait, wait);
 817
 818         spin_lock_irqsave(&dev->lock, flags);
 819         if (likely(!list_empty(&dev->tx_reqs)))
 820                 status |= POLLOUT | POLLWRNORM;
 821
 822         if (likely(dev->current_rx_bytes) ||
 823                         likely(!list_empty(&dev->rx_buffers)))
 824                 status |= POLLIN | POLLRDNORM;
 825
 826         spin_unlock_irqrestore(&dev->lock, flags);
 827
 828         return status;
 829 }
 830
 831 static long
 832 printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
 833 {
 834         struct printer_dev      *dev = fd->private_data;
 835         unsigned long           flags;
 836         int                     status = 0;
 837
 838         DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
 839
 840         /* handle ioctls */
 841
 842         spin_lock_irqsave(&dev->lock, flags);
 843
 844         switch (code) {
 845         case GADGET_GET_PRINTER_STATUS:
 846                 status = (int)dev->printer_status;
 847                 break;
 848         case GADGET_SET_PRINTER_STATUS:
 849                 dev->printer_status = (u8)arg;
 850                 break;
 851         default:
 852                 /* could not handle ioctl */
 853                 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
 854                                 code);
 855                 status = -ENOTTY;
 856         }
 857
 858         spin_unlock_irqrestore(&dev->lock, flags);
 859
 860         return status;
 861 }
 862
 863 /* used after endpoint configuration */
 864 static struct file_operations printer_io_operations = {
 865         .owner =        THIS_MODULE,
 866         .open =         printer_open,
 867         .read =         printer_read,
 868         .write =        printer_write,
 869         .fsync =        printer_fsync,
 870         .poll =         printer_poll,
 871         .unlocked_ioctl = printer_ioctl,
 872         .release =      printer_close
 873 };
 874
 875 /*-------------------------------------------------------------------------*/
 876
 877 static int
 878 set_printer_interface(struct printer_dev *dev)
 879 {
 880         int                     result = 0;
 881
 882         dev->in = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
 883         dev->in_ep->driver_data = dev;
 884
 885         dev->out = ep_desc(dev->gadget, &hs_ep_out_desc, &fs_ep_out_desc);
 886         dev->out_ep->driver_data = dev;
 887
 888         result = usb_ep_enable(dev->in_ep, dev->in);
 889         if (result != 0) {
 890                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 891                 goto done;
 892         }
 893
 894         result = usb_ep_enable(dev->out_ep, dev->out);
 895         if (result != 0) {
 896                 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
 897                 goto done;
 898         }
 899
 900 done:
 901         /* on error, disable any endpoints  */
 902         if (result != 0) {
 903                 (void) usb_ep_disable(dev->in_ep);
 904                 (void) usb_ep_disable(dev->out_ep);
 905                 dev->in = NULL;
 906                 dev->out = NULL;
 907         }
 908
 909         /* caller is responsible for cleanup on error */
 910         return result;
 911 }
 912
 913 static void printer_reset_interface(struct printer_dev *dev)
 914 {
 915         if (dev->interface < 0)
 916                 return;
 917
 918         DBG(dev, "%s\n", __func__);
 919
 920         if (dev->in)
 921                 usb_ep_disable(dev->in_ep);
 922
 923         if (dev->out)
 924                 usb_ep_disable(dev->out_ep);
 925
 926         dev->interface = -1;
 927 }
 928
 929 /* change our operational config.  must agree with the code
 930  * that returns config descriptors, and altsetting code.
 931  */
 932 static int
 933 printer_set_config(struct printer_dev *dev, unsigned number)
 934 {
 935         int                     result = 0;
 936         struct usb_gadget       *gadget = dev->gadget;
 937
 938         if (gadget_is_sa1100(gadget) && dev->config) {
 939                 /* tx fifo is full, but we can't clear it...*/
 940                 INFO(dev, "can't change configurations\n");
 941                 return -ESPIPE;
 942         }
 943
 944         switch (number) {
 945         case DEV_CONFIG_VALUE:
 946                 result = 0;
 947                 break;
 948         default:
 949                 result = -EINVAL;
 950                 /* FALL THROUGH */
 951         case 0:
 952                 break;
 953         }
 954
 955         if (result) {
 956                 usb_gadget_vbus_draw(dev->gadget,
 957                                 dev->gadget->is_otg ? 8 : 100);
 958         } else {
 959                 char *speed;
 960                 unsigned power;
 961
 962                 power = 2 * config_desc.bMaxPower;
 963                 usb_gadget_vbus_draw(dev->gadget, power);
 964
 965                 switch (gadget->speed) {
 966                 case USB_SPEED_FULL:    speed = "full"; break;
 967 #ifdef CONFIG_USB_GADGET_DUALSPEED
 968                 case USB_SPEED_HIGH:    speed = "high"; break;
 969 #endif
 970                 default:                speed = "?"; break;
 971                 }
 972
 973                 dev->config = number;
 974                 INFO(dev, "%s speed config #%d: %d mA, %s\n",
 975                                 speed, number, power, driver_desc);
 976         }
 977         return result;
 978 }
 979
 980 static int
 981 config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index,
 982                 int is_otg)
 983 {
 984         int                                     len;
 985         const struct usb_descriptor_header      **function;
 986 #ifdef CONFIG_USB_GADGET_DUALSPEED
 987         int                                     hs = (speed == USB_SPEED_HIGH);
 988
 989         if (type == USB_DT_OTHER_SPEED_CONFIG)
 990                 hs = !hs;
 991
 992         if (hs) {
 993                 function = hs_printer_function;
 994         } else {
 995                 function = fs_printer_function;
 996         }
 997 #else
 998         function = fs_printer_function;
 999 #endif
1000
1001         if (index >= device_desc.bNumConfigurations)
1002                 return -EINVAL;
1003
1004         /* for now, don't advertise srp-only devices */
1005         if (!is_otg)
1006                 function++;
1007
1008         len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE,
1009                         function);
1010         if (len < 0)
1011                 return len;
1012         ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1013         return len;
1014 }
1015
1016 /* Change our operational Interface. */
1017 static int
1018 set_interface(struct printer_dev *dev, unsigned number)
1019 {
1020         int                     result = 0;
1021
1022         if (gadget_is_sa1100(dev->gadget) && dev->interface < 0) {
1023                 /* tx fifo is full, but we can't clear it...*/
1024                 INFO(dev, "can't change interfaces\n");
1025                 return -ESPIPE;
1026         }
1027
1028         /* Free the current interface */
1029         switch (dev->interface) {
1030         case PRINTER_INTERFACE:
1031                 printer_reset_interface(dev);
1032                 break;
1033         }
1034
1035         switch (number) {
1036         case PRINTER_INTERFACE:
1037                 result = set_printer_interface(dev);
1038                 if (result) {
1039                         printer_reset_interface(dev);
1040                 } else {
1041                         dev->interface = PRINTER_INTERFACE;
1042                 }
1043                 break;
1044         default:
1045                 result = -EINVAL;
1046                 /* FALL THROUGH */
1047         }
1048
1049         if (!result)
1050                 INFO(dev, "Using interface %x\n", number);
1051
1052         return result;
1053 }
1054
1055 static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req)
1056 {
1057         if (req->status || req->actual != req->length)
1058                 DBG((struct printer_dev *) ep->driver_data,
1059                                 "setup complete --> %d, %d/%d\n",
1060                                 req->status, req->actual, req->length);
1061 }
1062
1063 static void printer_soft_reset(struct printer_dev *dev)
1064 {
1065         struct usb_request      *req;
1066
1067         INFO(dev, "Received Printer Reset Request\n");
1068
1069         if (usb_ep_disable(dev->in_ep))
1070                 DBG(dev, "Failed to disable USB in_ep\n");
1071         if (usb_ep_disable(dev->out_ep))
1072                 DBG(dev, "Failed to disable USB out_ep\n");
1073
1074         if (dev->current_rx_req != NULL) {
1075                 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
1076                 dev->current_rx_req = NULL;
1077         }
1078         dev->current_rx_bytes = 0;
1079         dev->current_rx_buf = NULL;
1080         dev->reset_printer = 1;
1081
1082         while (likely(!(list_empty(&dev->rx_buffers)))) {
1083                 req = container_of(dev->rx_buffers.next, struct usb_request,
1084                                 list);
1085                 list_del_init(&req->list);
1086                 list_add(&req->list, &dev->rx_reqs);
1087         }
1088
1089         while (likely(!(list_empty(&dev->rx_reqs_active)))) {
1090                 req = container_of(dev->rx_buffers.next, struct usb_request,
1091                                 list);
1092                 list_del_init(&req->list);
1093                 list_add(&req->list, &dev->rx_reqs);
1094         }
1095
1096         while (likely(!(list_empty(&dev->tx_reqs_active)))) {
1097                 req = container_of(dev->tx_reqs_active.next,
1098                                 struct usb_request, list);
1099                 list_del_init(&req->list);
1100                 list_add(&req->list, &dev->tx_reqs);
1101         }
1102
1103         if (usb_ep_enable(dev->in_ep, dev->in))
1104                 DBG(dev, "Failed to enable USB in_ep\n");
1105         if (usb_ep_enable(dev->out_ep, dev->out))
1106                 DBG(dev, "Failed to enable USB out_ep\n");
1107
1108         wake_up_interruptible(&dev->rx_wait);
1109         wake_up_interruptible(&dev->tx_wait);
1110         wake_up_interruptible(&dev->tx_flush_wait);
1111 }
1112
1113 /*-------------------------------------------------------------------------*/
1114
1115 /*
1116  * The setup() callback implements all the ep0 functionality that's not
1117  * handled lower down.
1118  */
1119 static int
1120 printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1121 {
1122         struct printer_dev      *dev = get_gadget_data(gadget);
1123         struct usb_request      *req = dev->req;
1124         int                     value = -EOPNOTSUPP;
1125         u16                     wIndex = le16_to_cpu(ctrl->wIndex);
1126         u16                     wValue = le16_to_cpu(ctrl->wValue);
1127         u16                     wLength = le16_to_cpu(ctrl->wLength);
1128
1129         DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
1130                 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
1131
1132         req->complete = printer_setup_complete;
1133
1134         switch (ctrl->bRequestType&USB_TYPE_MASK) {
1135
1136         case USB_TYPE_STANDARD:
1137                 switch (ctrl->bRequest) {
1138
1139                 case USB_REQ_GET_DESCRIPTOR:
1140                         if (ctrl->bRequestType != USB_DIR_IN)
1141                                 break;
1142                         switch (wValue >> 8) {
1143
1144                         case USB_DT_DEVICE:
1145                                 value = min(wLength, (u16) sizeof device_desc);
1146                                 memcpy(req->buf, &device_desc, value);
1147                                 break;
1148 #ifdef CONFIG_USB_GADGET_DUALSPEED
1149                         case USB_DT_DEVICE_QUALIFIER:
1150                                 if (!gadget->is_dualspeed)
1151                                         break;
1152                                 value = min(wLength,
1153                                                 (u16) sizeof dev_qualifier);
1154                                 memcpy(req->buf, &dev_qualifier, value);
1155                                 break;
1156
1157                         case USB_DT_OTHER_SPEED_CONFIG:
1158                                 if (!gadget->is_dualspeed)
1159                                         break;
1160                                 /* FALLTHROUGH */
1161 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1162                         case USB_DT_CONFIG:
1163                                 value = config_buf(gadget->speed, req->buf,
1164                                                 wValue >> 8,
1165                                                 wValue & 0xff,
1166                                                 gadget->is_otg);
1167                                 if (value >= 0)
1168                                         value = min(wLength, (u16) value);
1169                                 break;
1170
1171                         case USB_DT_STRING:
1172                                 value = usb_gadget_get_string(&stringtab,
1173                                                 wValue & 0xff, req->buf);
1174                                 if (value >= 0)
1175                                         value = min(wLength, (u16) value);
1176                                 break;
1177                         }
1178                         break;
1179
1180                 case USB_REQ_SET_CONFIGURATION:
1181                         if (ctrl->bRequestType != 0)
1182                                 break;
1183                         if (gadget->a_hnp_support)
1184                                 DBG(dev, "HNP available\n");
1185                         else if (gadget->a_alt_hnp_support)
1186                                 DBG(dev, "HNP needs a different root port\n");
1187                         value = printer_set_config(dev, wValue);
1188                         break;
1189                 case USB_REQ_GET_CONFIGURATION:
1190                         if (ctrl->bRequestType != USB_DIR_IN)
1191                                 break;
1192                         *(u8 *)req->buf = dev->config;
1193                         value = min(wLength, (u16) 1);
1194                         break;
1195
1196                 case USB_REQ_SET_INTERFACE:
1197                         if (ctrl->bRequestType != USB_RECIP_INTERFACE ||
1198                                         !dev->config)
1199                                 break;
1200
1201                         value = set_interface(dev, PRINTER_INTERFACE);
1202                         break;
1203                 case USB_REQ_GET_INTERFACE:
1204                         if (ctrl->bRequestType !=
1205                                         (USB_DIR_IN|USB_RECIP_INTERFACE)
1206                                         || !dev->config)
1207                                 break;
1208
1209                         *(u8 *)req->buf = dev->interface;
1210                         value = min(wLength, (u16) 1);
1211                         break;
1212
1213                 default:
1214                         goto unknown;
1215                 }
1216                 break;
1217
1218         case USB_TYPE_CLASS:
1219                 switch (ctrl->bRequest) {
1220                 case 0: /* Get the IEEE-1284 PNP String */
1221                         /* Only one printer interface is supported. */
1222                         if ((wIndex>>8) != PRINTER_INTERFACE)
1223                                 break;
1224
1225                         value = (pnp_string[0]<<8)|pnp_string[1];
1226                         memcpy(req->buf, pnp_string, value);
1227                         DBG(dev, "1284 PNP String: %x %s\n", value,
1228                                         &pnp_string[2]);
1229                         break;
1230
1231                 case 1: /* Get Port Status */
1232                         /* Only one printer interface is supported. */
1233                         if (wIndex != PRINTER_INTERFACE)
1234                                 break;
1235
1236                         *(u8 *)req->buf = dev->printer_status;
1237                         value = min(wLength, (u16) 1);
1238                         break;
1239
1240                 case 2: /* Soft Reset */
1241                         /* Only one printer interface is supported. */
1242                         if (wIndex != PRINTER_INTERFACE)
1243                                 break;
1244
1245                         printer_soft_reset(dev);
1246
1247                         value = 0;
1248                         break;
1249
1250                 default:
1251                         goto unknown;
1252                 }
1253                 break;
1254
1255         default:
1256 unknown:
1257                 VDBG(dev,
1258                         "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1259                         ctrl->bRequestType, ctrl->bRequest,
1260                         wValue, wIndex, wLength);
1261                 break;
1262         }
1263
1264         /* respond with data transfer before status phase? */
1265         if (value >= 0) {
1266                 req->length = value;
1267                 req->zero = value < wLength
1268                                 && (value % gadget->ep0->maxpacket) == 0;
1269                 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1270                 if (value < 0) {
1271                         DBG(dev, "ep_queue --> %d\n", value);
1272                         req->status = 0;
1273                         printer_setup_complete(gadget->ep0, req);
1274                 }
1275         }
1276
1277         /* host either stalls (value < 0) or reports success */
1278         return value;
1279 }
1280
1281 static void
1282 printer_disconnect(struct usb_gadget *gadget)
1283 {
1284         struct printer_dev      *dev = get_gadget_data(gadget);
1285         unsigned long           flags;
1286
1287         DBG(dev, "%s\n", __func__);
1288
1289         spin_lock_irqsave(&dev->lock, flags);
1290
1291         printer_reset_interface(dev);
1292
1293         spin_unlock_irqrestore(&dev->lock, flags);
1294 }
1295
1296 static void
1297 printer_unbind(struct usb_gadget *gadget)
1298 {
1299         struct printer_dev      *dev = get_gadget_data(gadget);
1300         struct usb_request      *req;
1301
1302
1303         DBG(dev, "%s\n", __func__);
1304
1305         /* Remove sysfs files */
1306         device_destroy(usb_gadget_class, g_printer_devno);
1307
1308         /* Remove Character Device */
1309         cdev_del(&dev->printer_cdev);
1310
1311         /* we must already have been disconnected ... no i/o may be active */
1312         WARN_ON(!list_empty(&dev->tx_reqs_active));
1313         WARN_ON(!list_empty(&dev->rx_reqs_active));
1314
1315         /* Free all memory for this driver. */
1316         while (!list_empty(&dev->tx_reqs)) {
1317                 req = container_of(dev->tx_reqs.next, struct usb_request,
1318                                 list);
1319                 list_del(&req->list);
1320                 printer_req_free(dev->in_ep, req);
1321         }
1322
1323         if (dev->current_rx_req != NULL)
1324                 printer_req_free(dev->out_ep, dev->current_rx_req);
1325
1326         while (!list_empty(&dev->rx_reqs)) {
1327                 req = container_of(dev->rx_reqs.next,
1328                                 struct usb_request, list);
1329                 list_del(&req->list);
1330                 printer_req_free(dev->out_ep, req);
1331         }
1332
1333         while (!list_empty(&dev->rx_buffers)) {
1334                 req = container_of(dev->rx_buffers.next,
1335                                 struct usb_request, list);
1336                 list_del(&req->list);
1337                 printer_req_free(dev->out_ep, req);
1338         }
1339
1340         if (dev->req) {
1341                 printer_req_free(gadget->ep0, dev->req);
1342                 dev->req = NULL;
1343         }
1344
1345         set_gadget_data(gadget, NULL);
1346 }
1347
1348 static int __init
1349 printer_bind(struct usb_gadget *gadget)
1350 {
1351         struct printer_dev      *dev;
1352         struct usb_ep           *in_ep, *out_ep;
1353         int                     status = -ENOMEM;
1354         int                     gcnum;
1355         size_t                  len;
1356         u32                     i;
1357         struct usb_request      *req;
1358
1359         dev = &usb_printer_gadget;
1360
1361
1362         /* Setup the sysfs files for the printer gadget. */
1363         dev->pdev = device_create_drvdata(usb_gadget_class, NULL,
1364                                           g_printer_devno, NULL, "g_printer");
1365         if (IS_ERR(dev->pdev)) {
1366                 ERROR(dev, "Failed to create device: g_printer\n");
1367                 goto fail;
1368         }
1369
1370         /*
1371          * Register a character device as an interface to a user mode
1372          * program that handles the printer specific functionality.
1373          */
1374         cdev_init(&dev->printer_cdev, &printer_io_operations);
1375         dev->printer_cdev.owner = THIS_MODULE;
1376         status = cdev_add(&dev->printer_cdev, g_printer_devno, 1);
1377         if (status) {
1378                 ERROR(dev, "Failed to open char device\n");
1379                 goto fail;
1380         }
1381
1382         if (gadget_is_sa1100(gadget)) {
1383                 /* hardware can't write zero length packets. */
1384                 ERROR(dev, "SA1100 controller is unsupport by this driver\n");
1385                 goto fail;
1386         }
1387
1388         gcnum = usb_gadget_controller_number(gadget);
1389         if (gcnum >= 0) {
1390                 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
1391         } else {
1392                 dev_warn(&gadget->dev, "controller '%s' not recognized\n",
1393                         gadget->name);
1394                 /* unrecognized, but safe unless bulk is REALLY quirky */
1395                 device_desc.bcdDevice =
1396                         __constant_cpu_to_le16(0xFFFF);
1397         }
1398         snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1399                 init_utsname()->sysname, init_utsname()->release,
1400                 gadget->name);
1401
1402         device_desc.idVendor =
1403                 __constant_cpu_to_le16(PRINTER_VENDOR_NUM);
1404         device_desc.idProduct =
1405                 __constant_cpu_to_le16(PRINTER_PRODUCT_NUM);
1406
1407         /* support optional vendor/distro customization */
1408         if (idVendor) {
1409                 if (!idProduct) {
1410                         dev_err(&gadget->dev, "idVendor needs idProduct!\n");
1411                         return -ENODEV;
1412                 }
1413                 device_desc.idVendor = cpu_to_le16(idVendor);
1414                 device_desc.idProduct = cpu_to_le16(idProduct);
1415                 if (bcdDevice)
1416                         device_desc.bcdDevice = cpu_to_le16(bcdDevice);
1417         }
1418
1419         if (iManufacturer)
1420                 strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
1421
1422         if (iProduct)
1423                 strlcpy(product_desc, iProduct, sizeof product_desc);
1424
1425         if (iSerialNum)
1426                 strlcpy(serial_num, iSerialNum, sizeof serial_num);
1427
1428         if (iPNPstring)
1429                 strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2);
1430
1431         len = strlen(pnp_string);
1432         pnp_string[0] = (len >> 8) & 0xFF;
1433         pnp_string[1] = len & 0xFF;
1434
1435         /* all we really need is bulk IN/OUT */
1436         usb_ep_autoconfig_reset(gadget);
1437         in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc);
1438         if (!in_ep) {
1439 autoconf_fail:
1440                 dev_err(&gadget->dev, "can't autoconfigure on %s\n",
1441                         gadget->name);
1442                 return -ENODEV;
1443         }
1444         in_ep->driver_data = in_ep;     /* claim */
1445
1446         out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc);
1447         if (!out_ep)
1448                 goto autoconf_fail;
1449         out_ep->driver_data = out_ep;   /* claim */
1450
1451 #ifdef  CONFIG_USB_GADGET_DUALSPEED
1452         /* assumes ep0 uses the same value for both speeds ... */
1453         dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
1454
1455         /* and that all endpoints are dual-speed */
1456         hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1457         hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1458 #endif  /* DUALSPEED */
1459
1460         device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1461         usb_gadget_set_selfpowered(gadget);
1462
1463         if (gadget->is_otg) {
1464                 otg_desc.bmAttributes |= USB_OTG_HNP,
1465                 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1466                 config_desc.bMaxPower = 4;
1467         }
1468
1469         spin_lock_init(&dev->lock);
1470         spin_lock_init(&dev->lock_printer_io);
1471         INIT_LIST_HEAD(&dev->tx_reqs);
1472         INIT_LIST_HEAD(&dev->tx_reqs_active);
1473         INIT_LIST_HEAD(&dev->rx_reqs);
1474         INIT_LIST_HEAD(&dev->rx_reqs_active);
1475         INIT_LIST_HEAD(&dev->rx_buffers);
1476         init_waitqueue_head(&dev->rx_wait);
1477         init_waitqueue_head(&dev->tx_wait);
1478         init_waitqueue_head(&dev->tx_flush_wait);
1479
1480         dev->config = 0;
1481         dev->interface = -1;
1482         dev->printer_cdev_open = 0;
1483         dev->printer_status = PRINTER_NOT_ERROR;
1484         dev->current_rx_req = NULL;
1485         dev->current_rx_bytes = 0;
1486         dev->current_rx_buf = NULL;
1487
1488         dev->in_ep = in_ep;
1489         dev->out_ep = out_ep;
1490
1491         /* preallocate control message data and buffer */
1492         dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE,
1493                         GFP_KERNEL);
1494         if (!dev->req) {
1495                 status = -ENOMEM;
1496                 goto fail;
1497         }
1498
1499         for (i = 0; i < QLEN; i++) {
1500                 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1501                 if (!req) {
1502                         while (!list_empty(&dev->tx_reqs)) {
1503                                 req = container_of(dev->tx_reqs.next,
1504                                                 struct usb_request, list);
1505                                 list_del(&req->list);
1506                                 printer_req_free(dev->in_ep, req);
1507                         }
1508                         return -ENOMEM;
1509                 }
1510                 list_add(&req->list, &dev->tx_reqs);
1511         }
1512
1513         for (i = 0; i < QLEN; i++) {
1514                 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1515                 if (!req) {
1516                         while (!list_empty(&dev->rx_reqs)) {
1517                                 req = container_of(dev->rx_reqs.next,
1518                                                 struct usb_request, list);
1519                                 list_del(&req->list);
1520                                 printer_req_free(dev->out_ep, req);
1521                         }
1522                         return -ENOMEM;
1523                 }
1524                 list_add(&req->list, &dev->rx_reqs);
1525         }
1526
1527         dev->req->complete = printer_setup_complete;
1528
1529         /* finish hookup to lower layer ... */
1530         dev->gadget = gadget;
1531         set_gadget_data(gadget, dev);
1532         gadget->ep0->driver_data = dev;
1533
1534         INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
1535         INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name,
1536                         in_ep->name);
1537
1538         return 0;
1539
1540 fail:
1541         printer_unbind(gadget);
1542         return status;
1543 }
1544
1545 /*-------------------------------------------------------------------------*/
1546
1547 static struct usb_gadget_driver printer_driver = {
1548         .speed          = DEVSPEED,
1549
1550         .function       = (char *) driver_desc,
1551         .bind           = printer_bind,
1552         .unbind         = printer_unbind,
1553
1554         .setup          = printer_setup,
1555         .disconnect     = printer_disconnect,
1556
1557         .driver         = {
1558                 .name           = (char *) shortname,
1559                 .owner          = THIS_MODULE,
1560         },
1561 };
1562
1563 MODULE_DESCRIPTION(DRIVER_DESC);
1564 MODULE_AUTHOR("Craig Nadler");
1565 MODULE_LICENSE("GPL");
1566
1567 static int __init
1568 init(void)
1569 {
1570         int status;
1571
1572         usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1573         if (IS_ERR(usb_gadget_class)) {
1574                 status = PTR_ERR(usb_gadget_class);
1575                 ERROR(dev, "unable to create usb_gadget class %d\n", status);
1576                 return status;
1577         }
1578
1579         status = alloc_chrdev_region(&g_printer_devno, 0, 1,
1580                         "USB printer gadget");
1581         if (status) {
1582                 ERROR(dev, "alloc_chrdev_region %d\n", status);
1583                 class_destroy(usb_gadget_class);
1584                 return status;
1585         }
1586
1587         status = usb_gadget_register_driver(&printer_driver);
1588         if (status) {
1589                 class_destroy(usb_gadget_class);
1590                 unregister_chrdev_region(g_printer_devno, 1);
1591                 DBG(dev, "usb_gadget_register_driver %x\n", status);
1592         }
1593
1594         return status;
1595 }
1596 module_init(init);
1597
1598 static void __exit
1599 cleanup(void)
1600 {
1601         int status;
1602
1603         spin_lock(&usb_printer_gadget.lock_printer_io);
1604         class_destroy(usb_gadget_class);
1605         unregister_chrdev_region(g_printer_devno, 2);
1606
1607         status = usb_gadget_unregister_driver(&printer_driver);
1608         if (status)
1609                 ERROR(dev, "usb_gadget_unregister_driver %x\n", status);
1610
1611         spin_unlock(&usb_printer_gadget.lock_printer_io);
1612 }
1613 module_exit(cleanup);