USB: g_printer, fix empty if statement
[sfrench/cifs-2.6.git] / 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);