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
57 /*
58 * Kbuild is not very cooperative with respect to linking separately
59 * compiled library objects into one module. So for now we won't use
60 * separate compilation ... ensuring init/exit sections work to shrink
61 * the runtime footprint, and giving us at least some parts of what
62 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
63 */
64 #include "usbstring.c"
65 #include "config.c"
66 #include "epautoconf.c"
67
68 /*-------------------------------------------------------------------------*/
69
70 #define DRIVER_DESC "Printer Gadget"
71 #define DRIVER_VERSION "2007 OCT 06"
72
73 static const char shortname [] = "printer";
74 static const char driver_desc [] = DRIVER_DESC;
75
76 static dev_t g_printer_devno;
77
78 static struct class *usb_gadget_class;
79
80 /*-------------------------------------------------------------------------*/
81
82 struct printer_dev {
83 spinlock_t lock; /* lock this structure */
84 /* lock buffer lists during read/write calls */
85 spinlock_t lock_printer_io;
86 struct usb_gadget *gadget;
87 struct usb_request *req; /* for control responses */
88 u8 config;
89 s8 interface;
90 struct usb_ep *in_ep, *out_ep;
91 const struct usb_endpoint_descriptor
92 *in, *out;
93 struct list_head rx_reqs; /* List of free RX structs */
94 struct list_head rx_reqs_active; /* List of Active RX xfers */
95 struct list_head rx_buffers; /* List of completed xfers */
96 /* wait until there is data to be read. */
97 wait_queue_head_t rx_wait;
98 struct list_head tx_reqs; /* List of free TX structs */
99 struct list_head tx_reqs_active; /* List of Active TX xfers */
100 /* Wait until there are write buffers available to use. */
101 wait_queue_head_t tx_wait;
102 /* Wait until all write buffers have been sent. */
103 wait_queue_head_t tx_flush_wait;
104 struct usb_request *current_rx_req;
105 size_t current_rx_bytes;
106 u8 *current_rx_buf;
107 u8 printer_status;
108 u8 reset_printer;
109 struct cdev printer_cdev;
110 struct device *pdev;
111 u8 printer_cdev_open;
112 wait_queue_head_t wait;
113 };
114
115 static struct printer_dev usb_printer_gadget;
116
117 /*-------------------------------------------------------------------------*/
118
119 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
120 * Instead: allocate your own, using normal USB-IF procedures.
121 */
122
123 /* Thanks to NetChip Technologies for donating this product ID.
124 */
125 #define PRINTER_VENDOR_NUM 0x0525 /* NetChip */
126 #define PRINTER_PRODUCT_NUM 0xa4a8 /* Linux-USB Printer Gadget */
127
128 /* Some systems will want different product identifers published in the
129 * device descriptor, either numbers or strings or both. These string
130 * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
131 */
132
133 static ushort __initdata idVendor;
134 module_param(idVendor, ushort, S_IRUGO);
135 MODULE_PARM_DESC(idVendor, "USB Vendor ID");
136
137 static ushort __initdata idProduct;
138 module_param(idProduct, ushort, S_IRUGO);
139 MODULE_PARM_DESC(idProduct, "USB Product ID");
140
141 static ushort __initdata bcdDevice;
142 module_param(bcdDevice, ushort, S_IRUGO);
143 MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
144
145 static char *__initdata iManufacturer;
146 module_param(iManufacturer, charp, S_IRUGO);
147 MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
148
149 static char *__initdata iProduct;
150 module_param(iProduct, charp, S_IRUGO);
151 MODULE_PARM_DESC(iProduct, "USB Product string");
152
153 static char *__initdata iSerialNum;
154 module_param(iSerialNum, charp, S_IRUGO);
155 MODULE_PARM_DESC(iSerialNum, "1");
156
157 static char *__initdata iPNPstring;
158 module_param(iPNPstring, charp, S_IRUGO);
159 MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
160
161 /* Number of requests to allocate per endpoint, not used for ep0. */
162 static unsigned qlen = 10;
163 module_param(qlen, uint, S_IRUGO|S_IWUSR);
164
165 #define QLEN qlen
166
167 #ifdef CONFIG_USB_GADGET_DUALSPEED
168 #define DEVSPEED USB_SPEED_HIGH
169 #else /* full speed (low speed doesn't do bulk) */
170 #define DEVSPEED USB_SPEED_FULL
171 #endif
172
173 /*-------------------------------------------------------------------------*/
174
175 #define xprintk(d, level, fmt, args...) \
176 printk(level "%s: " fmt, DRIVER_DESC, ## args)
177
178 #ifdef DEBUG
179 #define DBG(dev, fmt, args...) \
180 xprintk(dev, KERN_DEBUG, fmt, ## args)
181 #else
182 #define DBG(dev, fmt, args...) \
183 do { } while (0)
184 #endif /* DEBUG */
185
186 #ifdef VERBOSE
187 #define VDBG(dev, fmt, args...) \
188 xprintk(dev, KERN_DEBUG, fmt, ## args)
189 #else
190 #define VDBG(dev, fmt, args...) \
191 do { } while (0)
192 #endif /* VERBOSE */
193
194 #define ERROR(dev, fmt, args...) \
195 xprintk(dev, KERN_ERR, fmt, ## args)
196 #define WARNING(dev, fmt, args...) \
197 xprintk(dev, KERN_WARNING, fmt, ## args)
198 #define INFO(dev, fmt, args...) \
199 xprintk(dev, KERN_INFO, fmt, ## args)
200
201 /*-------------------------------------------------------------------------*/
202
203 /* USB DRIVER HOOKUP (to the hardware driver, below us), mostly
204 * ep0 implementation: descriptors, config management, setup().
205 * also optional class-specific notification interrupt transfer.
206 */
207
208 /*
209 * DESCRIPTORS ... most are static, but strings and (full) configuration
210 * descriptors are built on demand.
211 */
212
213 #define STRING_MANUFACTURER 1
214 #define STRING_PRODUCT 2
215 #define STRING_SERIALNUM 3
216
217 /* holds our biggest descriptor */
218 #define USB_DESC_BUFSIZE 256
219 #define USB_BUFSIZE 8192
220
221 /* This device advertises one configuration. */
222 #define DEV_CONFIG_VALUE 1
223 #define PRINTER_INTERFACE 0
224
225 static struct usb_device_descriptor device_desc = {
226 .bLength = sizeof device_desc,
227 .bDescriptorType = USB_DT_DEVICE,
228 .bcdUSB = __constant_cpu_to_le16(0x0200),
229 .bDeviceClass = USB_CLASS_PER_INTERFACE,
230 .bDeviceSubClass = 0,
231 .bDeviceProtocol = 0,
232 .idVendor = __constant_cpu_to_le16(PRINTER_VENDOR_NUM),
233 .idProduct = __constant_cpu_to_le16(PRINTER_PRODUCT_NUM),
234 .iManufacturer = STRING_MANUFACTURER,
235 .iProduct = STRING_PRODUCT,
236 .iSerialNumber = STRING_SERIALNUM,
237 .bNumConfigurations = 1
238 };
239
240 static struct usb_otg_descriptor otg_desc = {
241 .bLength = sizeof otg_desc,
242 .bDescriptorType = USB_DT_OTG,
243 .bmAttributes = USB_OTG_SRP
244 };
245
246 static struct usb_config_descriptor config_desc = {
247 .bLength = sizeof config_desc,
248 .bDescriptorType = USB_DT_CONFIG,
249
250 /* compute wTotalLength on the fly */
251 .bNumInterfaces = 1,
252 .bConfigurationValue = DEV_CONFIG_VALUE,
253 .iConfiguration = 0,
254 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
255 .bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2,
256 };
257
258 static struct usb_interface_descriptor intf_desc = {
259 .bLength = sizeof intf_desc,
260 .bDescriptorType = USB_DT_INTERFACE,
261 .bInterfaceNumber = PRINTER_INTERFACE,
262 .bNumEndpoints = 2,
263 .bInterfaceClass = USB_CLASS_PRINTER,
264 .bInterfaceSubClass = 1, /* Printer Sub-Class */
265 .bInterfaceProtocol = 2, /* Bi-Directional */
266 .iInterface = 0
267 };
268
269 static struct usb_endpoint_descriptor fs_ep_in_desc = {
270 .bLength = USB_DT_ENDPOINT_SIZE,
271 .bDescriptorType = USB_DT_ENDPOINT,
272 .bEndpointAddress = USB_DIR_IN,
273 .bmAttributes = USB_ENDPOINT_XFER_BULK
274 };
275
276 static struct usb_endpoint_descriptor fs_ep_out_desc = {
277 .bLength = USB_DT_ENDPOINT_SIZE,
278 .bDescriptorType = USB_DT_ENDPOINT,
279 .bEndpointAddress = USB_DIR_OUT,
280 .bmAttributes = USB_ENDPOINT_XFER_BULK
281 };
282
283 static const struct usb_descriptor_header *fs_printer_function [11] = {
284 (struct usb_descriptor_header *) &otg_desc,
285 (struct usb_descriptor_header *) &intf_desc,
286 (struct usb_descriptor_header *) &fs_ep_in_desc,
287 (struct usb_descriptor_header *) &fs_ep_out_desc,
288 NULL
289 };
290
291 #ifdef CONFIG_USB_GADGET_DUALSPEED
292
293 /*
294 * usb 2.0 devices need to expose both high speed and full speed
295 * descriptors, unless they only run at full speed.
296 */
297
298 static struct usb_endpoint_descriptor hs_ep_in_desc = {
299 .bLength = USB_DT_ENDPOINT_SIZE,
300 .bDescriptorType = USB_DT_ENDPOINT,
301 .bmAttributes = USB_ENDPOINT_XFER_BULK,
302 .wMaxPacketSize = __constant_cpu_to_le16(512)
303 };
304
305 static struct usb_endpoint_descriptor hs_ep_out_desc = {
306 .bLength = USB_DT_ENDPOINT_SIZE,
307 .bDescriptorType = USB_DT_ENDPOINT,
308 .bmAttributes = USB_ENDPOINT_XFER_BULK,
309 .wMaxPacketSize = __constant_cpu_to_le16(512)
310 };
311
312 static struct usb_qualifier_descriptor dev_qualifier = {
313 .bLength = sizeof dev_qualifier,
314 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
315 .bcdUSB = __constant_cpu_to_le16(0x0200),
316 .bDeviceClass = USB_CLASS_PRINTER,
317 .bNumConfigurations = 1
318 };
319
320 static const struct usb_descriptor_header *hs_printer_function [11] = {
321 (struct usb_descriptor_header *) &otg_desc,
322 (struct usb_descriptor_header *) &intf_desc,
323 (struct usb_descriptor_header *) &hs_ep_in_desc,
324 (struct usb_descriptor_header *) &hs_ep_out_desc,
325 NULL
326 };
327
328 /* maxpacket and other transfer characteristics vary by speed. */
329 #define ep_desc(g, hs, fs) (((g)->speed == USB_SPEED_HIGH)?(hs):(fs))
330
331 #else
332
333 /* if there's no high speed support, maxpacket doesn't change. */
334 #define ep_desc(g, hs, fs) (((void)(g)), (fs))
335
336 #endif /* !CONFIG_USB_GADGET_DUALSPEED */
337
338 /*-------------------------------------------------------------------------*/
339
340 /* descriptors that are built on-demand */
341
342 static char manufacturer [50];
343 static char product_desc [40] = DRIVER_DESC;
344 static char serial_num [40] = "1";
345 static char pnp_string [1024] =
346 "XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
347
348 /* static strings, in UTF-8 */
349 static struct usb_string strings [] = {
350 { STRING_MANUFACTURER, manufacturer, },
351 { STRING_PRODUCT, product_desc, },
352 { STRING_SERIALNUM, serial_num, },
353 { } /* end of list */
354 };
355
356 static struct usb_gadget_strings stringtab = {
357 .language = 0x0409, /* en-us */
358 .strings = strings,
359 };
360
361 /*-------------------------------------------------------------------------*/
362
363 static struct usb_request *
printer_req_alloc(struct usb_ep * ep,unsigned len,gfp_t gfp_flags)364 printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
365 {
366 struct usb_request *req;
367
368 req = usb_ep_alloc_request(ep, gfp_flags);
369
370 if (req != NULL) {
371 req->length = len;
372 req->buf = kmalloc(len, gfp_flags);
373 if (req->buf == NULL) {
374 usb_ep_free_request(ep, req);
375 return NULL;
376 }
377 }
378
379 return req;
380 }
381
382 static void
printer_req_free(struct usb_ep * ep,struct usb_request * req)383 printer_req_free(struct usb_ep *ep, struct usb_request *req)
384 {
385 if (ep != NULL && req != NULL) {
386 kfree(req->buf);
387 usb_ep_free_request(ep, req);
388 }
389 }
390
391 /*-------------------------------------------------------------------------*/
392
rx_complete(struct usb_ep * ep,struct usb_request * req)393 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
394 {
395 struct printer_dev *dev = ep->driver_data;
396 int status = req->status;
397 unsigned long flags;
398
399 spin_lock_irqsave(&dev->lock, flags);
400
401 list_del_init(&req->list); /* Remode from Active List */
402
403 switch (status) {
404
405 /* normal completion */
406 case 0:
407 if (req->actual > 0) {
408 list_add_tail(&req->list, &dev->rx_buffers);
409 DBG(dev, "G_Printer : rx length %d\n", req->actual);
410 } else {
411 list_add(&req->list, &dev->rx_reqs);
412 }
413 break;
414
415 /* software-driven interface shutdown */
416 case -ECONNRESET: /* unlink */
417 case -ESHUTDOWN: /* disconnect etc */
418 VDBG(dev, "rx shutdown, code %d\n", status);
419 list_add(&req->list, &dev->rx_reqs);
420 break;
421
422 /* for hardware automagic (such as pxa) */
423 case -ECONNABORTED: /* endpoint reset */
424 DBG(dev, "rx %s reset\n", ep->name);
425 list_add(&req->list, &dev->rx_reqs);
426 break;
427
428 /* data overrun */
429 case -EOVERFLOW:
430 /* FALLTHROUGH */
431
432 default:
433 DBG(dev, "rx status %d\n", status);
434 list_add(&req->list, &dev->rx_reqs);
435 break;
436 }
437
438 wake_up_interruptible(&dev->rx_wait);
439 spin_unlock_irqrestore(&dev->lock, flags);
440 }
441
tx_complete(struct usb_ep * ep,struct usb_request * req)442 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
443 {
444 struct printer_dev *dev = ep->driver_data;
445
446 switch (req->status) {
447 default:
448 VDBG(dev, "tx err %d\n", req->status);
449 /* FALLTHROUGH */
450 case -ECONNRESET: /* unlink */
451 case -ESHUTDOWN: /* disconnect etc */
452 break;
453 case 0:
454 break;
455 }
456
457 spin_lock(&dev->lock);
458 /* Take the request struct off the active list and put it on the
459 * free list.
460 */
461 list_del_init(&req->list);
462 list_add(&req->list, &dev->tx_reqs);
463 wake_up_interruptible(&dev->tx_wait);
464 if (likely(list_empty(&dev->tx_reqs_active)))
465 wake_up_interruptible(&dev->tx_flush_wait);
466
467 spin_unlock(&dev->lock);
468 }
469
470 /*-------------------------------------------------------------------------*/
471
472 static int
printer_open(struct inode * inode,struct file * fd)473 printer_open(struct inode *inode, struct file *fd)
474 {
475 struct printer_dev *dev;
476 unsigned long flags;
477 int ret = -EBUSY;
478
479 lock_kernel();
480 dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
481
482 spin_lock_irqsave(&dev->lock, flags);
483
484 if (!dev->printer_cdev_open) {
485 dev->printer_cdev_open = 1;
486 fd->private_data = dev;
487 ret = 0;
488 /* Change the printer status to show that it's on-line. */
489 dev->printer_status |= PRINTER_SELECTED;
490 }
491
492 spin_unlock_irqrestore(&dev->lock, flags);
493
494 DBG(dev, "printer_open returned %x\n", ret);
495 unlock_kernel();
496 return ret;
497 }
498
499 static int
printer_close(struct inode * inode,struct file * fd)500 printer_close(struct inode *inode, struct file *fd)
501 {
502 struct printer_dev *dev = fd->private_data;
503 unsigned long flags;
504
505 spin_lock_irqsave(&dev->lock, flags);
506 dev->printer_cdev_open = 0;
507 fd->private_data = NULL;
508 /* Change printer status to show that the printer is off-line. */
509 dev->printer_status &= ~PRINTER_SELECTED;
510 spin_unlock_irqrestore(&dev->lock, flags);
511
512 DBG(dev, "printer_close\n");
513
514 return 0;
515 }
516
517 /* This function must be called with interrupts turned off. */
518 static void
setup_rx_reqs(struct printer_dev * dev)519 setup_rx_reqs(struct printer_dev *dev)
520 {
521 struct usb_request *req;
522
523 while (likely(!list_empty(&dev->rx_reqs))) {
524 int error;
525
526 req = container_of(dev->rx_reqs.next,
527 struct usb_request, list);
528 list_del_init(&req->list);
529
530 /* The USB Host sends us whatever amount of data it wants to
531 * so we always set the length field to the full USB_BUFSIZE.
532 * If the amount of data is more than the read() caller asked
533 * for it will be stored in the request buffer until it is
534 * asked for by read().
535 */
536 req->length = USB_BUFSIZE;
537 req->complete = rx_complete;
538
539 error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
540 if (error) {
541 DBG(dev, "rx submit --> %d\n", error);
542 list_add(&req->list, &dev->rx_reqs);
543 break;
544 } else {
545 list_add(&req->list, &dev->rx_reqs_active);
546 }
547 }
548 }
549
550 static ssize_t
printer_read(struct file * fd,char __user * buf,size_t len,loff_t * ptr)551 printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
552 {
553 struct printer_dev *dev = fd->private_data;
554 unsigned long flags;
555 size_t size;
556 size_t bytes_copied;
557 struct usb_request *req;
558 /* This is a pointer to the current USB rx request. */
559 struct usb_request *current_rx_req;
560 /* This is the number of bytes in the current rx buffer. */
561 size_t current_rx_bytes;
562 /* This is a pointer to the current rx buffer. */
563 u8 *current_rx_buf;
564
565 if (len == 0)
566 return -EINVAL;
567
568 DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
569
570 spin_lock(&dev->lock_printer_io);
571 spin_lock_irqsave(&dev->lock, flags);
572
573 /* We will use this flag later to check if a printer reset happened
574 * after we turn interrupts back on.
575 */
576 dev->reset_printer = 0;
577
578 setup_rx_reqs(dev);
579
580 bytes_copied = 0;
581 current_rx_req = dev->current_rx_req;
582 current_rx_bytes = dev->current_rx_bytes;
583 current_rx_buf = dev->current_rx_buf;
584 dev->current_rx_req = NULL;
585 dev->current_rx_bytes = 0;
586 dev->current_rx_buf = NULL;
587
588 /* Check if there is any data in the read buffers. Please note that
589 * current_rx_bytes is the number of bytes in the current rx buffer.
590 * If it is zero then check if there are any other rx_buffers that
591 * are on the completed list. We are only out of data if all rx
592 * buffers are empty.
593 */
594 if ((current_rx_bytes == 0) &&
595 (likely(list_empty(&dev->rx_buffers)))) {
596 /* Turn interrupts back on before sleeping. */
597 spin_unlock_irqrestore(&dev->lock, flags);
598
599 /*
600 * If no data is available check if this is a NON-Blocking
601 * call or not.
602 */
603 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
604 spin_unlock(&dev->lock_printer_io);
605 return -EAGAIN;
606 }
607
608 /* Sleep until data is available */
609 wait_event_interruptible(dev->rx_wait,
610 (likely(!list_empty(&dev->rx_buffers))));
611 spin_lock_irqsave(&dev->lock, flags);
612 }
613
614 /* We have data to return then copy it to the caller's buffer.*/
615 while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
616 && len) {
617 if (current_rx_bytes == 0) {
618 req = container_of(dev->rx_buffers.next,
619 struct usb_request, list);
620 list_del_init(&req->list);
621
622 if (req->actual && req->buf) {
623 current_rx_req = req;
624 current_rx_bytes = req->actual;
625 current_rx_buf = req->buf;
626 } else {
627 list_add(&req->list, &dev->rx_reqs);
628 continue;
629 }
630 }
631
632 /* Don't leave irqs off while doing memory copies */
633 spin_unlock_irqrestore(&dev->lock, flags);
634
635 if (len > current_rx_bytes)
636 size = current_rx_bytes;
637 else
638 size = len;
639
640 size -= copy_to_user(buf, current_rx_buf, size);
641 bytes_copied += size;
642 len -= size;
643 buf += size;
644
645 spin_lock_irqsave(&dev->lock, flags);
646
647 /* We've disconnected or reset so return. */
648 if (dev->reset_printer) {
649 list_add(¤t_rx_req->list, &dev->rx_reqs);
650 spin_unlock_irqrestore(&dev->lock, flags);
651 spin_unlock(&dev->lock_printer_io);
652 return -EAGAIN;
653 }
654
655 /* If we not returning all the data left in this RX request
656 * buffer then adjust the amount of data left in the buffer.
657 * Othewise if we are done with this RX request buffer then
658 * requeue it to get any incoming data from the USB host.
659 */
660 if (size < current_rx_bytes) {
661 current_rx_bytes -= size;
662 current_rx_buf += size;
663 } else {
664 list_add(¤t_rx_req->list, &dev->rx_reqs);
665 current_rx_bytes = 0;
666 current_rx_buf = NULL;
667 current_rx_req = NULL;
668 }
669 }
670
671 dev->current_rx_req = current_rx_req;
672 dev->current_rx_bytes = current_rx_bytes;
673 dev->current_rx_buf = current_rx_buf;
674
675 spin_unlock_irqrestore(&dev->lock, flags);
676 spin_unlock(&dev->lock_printer_io);
677
678 DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
679
680 if (bytes_copied)
681 return bytes_copied;
682 else
683 return -EAGAIN;
684 }
685
686 static ssize_t
printer_write(struct file * fd,const char __user * buf,size_t len,loff_t * ptr)687 printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
688 {
689 struct printer_dev *dev = fd->private_data;
690 unsigned long flags;
691 size_t size; /* Amount of data in a TX request. */
692 size_t bytes_copied = 0;
693 struct usb_request *req;
694
695 DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
696
697 if (len == 0)
698 return -EINVAL;
699
700 spin_lock(&dev->lock_printer_io);
701 spin_lock_irqsave(&dev->lock, flags);
702
703 /* Check if a printer reset happens while we have interrupts on */
704 dev->reset_printer = 0;
705
706 /* Check if there is any available write buffers */
707 if (likely(list_empty(&dev->tx_reqs))) {
708 /* Turn interrupts back on before sleeping. */
709 spin_unlock_irqrestore(&dev->lock, flags);
710
711 /*
712 * If write buffers are available check if this is
713 * a NON-Blocking call or not.
714 */
715 if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
716 spin_unlock(&dev->lock_printer_io);
717 return -EAGAIN;
718 }
719
720 /* Sleep until a write buffer is available */
721 wait_event_interruptible(dev->tx_wait,
722 (likely(!list_empty(&dev->tx_reqs))));
723 spin_lock_irqsave(&dev->lock, flags);
724 }
725
726 while (likely(!list_empty(&dev->tx_reqs)) && len) {
727
728 if (len > USB_BUFSIZE)
729 size = USB_BUFSIZE;
730 else
731 size = len;
732
733 req = container_of(dev->tx_reqs.next, struct usb_request,
734 list);
735 list_del_init(&req->list);
736
737 req->complete = tx_complete;
738 req->length = size;
739
740 /* Check if we need to send a zero length packet. */
741 if (len > size)
742 /* They will be more TX requests so no yet. */
743 req->zero = 0;
744 else
745 /* If the data amount is not a multple of the
746 * maxpacket size then send a zero length packet.
747 */
748 req->zero = ((len % dev->in_ep->maxpacket) == 0);
749
750 /* Don't leave irqs off while doing memory copies */
751 spin_unlock_irqrestore(&dev->lock, flags);
752
753 if (copy_from_user(req->buf, buf, size)) {
754 list_add(&req->list, &dev->tx_reqs);
755 spin_unlock(&dev->lock_printer_io);
756 return bytes_copied;
757 }
758
759 bytes_copied += size;
760 len -= size;
761 buf += size;
762
763 spin_lock_irqsave(&dev->lock, flags);
764
765 /* We've disconnected or reset so free the req and buffer */
766 if (dev->reset_printer) {
767 list_add(&req->list, &dev->tx_reqs);
768 spin_unlock_irqrestore(&dev->lock, flags);
769 spin_unlock(&dev->lock_printer_io);
770 return -EAGAIN;
771 }
772
773 if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
774 list_add(&req->list, &dev->tx_reqs);
775 spin_unlock_irqrestore(&dev->lock, flags);
776 spin_unlock(&dev->lock_printer_io);
777 return -EAGAIN;
778 }
779
780 list_add(&req->list, &dev->tx_reqs_active);
781
782 }
783
784 spin_unlock_irqrestore(&dev->lock, flags);
785 spin_unlock(&dev->lock_printer_io);
786
787 DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
788
789 if (bytes_copied) {
790 return bytes_copied;
791 } else {
792 return -EAGAIN;
793 }
794 }
795
796 static int
printer_fsync(struct file * fd,struct dentry * dentry,int datasync)797 printer_fsync(struct file *fd, struct dentry *dentry, int datasync)
798 {
799 struct printer_dev *dev = fd->private_data;
800 unsigned long flags;
801 int tx_list_empty;
802
803 spin_lock_irqsave(&dev->lock, flags);
804 tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
805 spin_unlock_irqrestore(&dev->lock, flags);
806
807 if (!tx_list_empty) {
808 /* Sleep until all data has been sent */
809 wait_event_interruptible(dev->tx_flush_wait,
810 (likely(list_empty(&dev->tx_reqs_active))));
811 }
812
813 return 0;
814 }
815
816 static unsigned int
printer_poll(struct file * fd,poll_table * wait)817 printer_poll(struct file *fd, poll_table *wait)
818 {
819 struct printer_dev *dev = fd->private_data;
820 unsigned long flags;
821 int status = 0;
822
823 spin_lock(&dev->lock_printer_io);
824 spin_lock_irqsave(&dev->lock, flags);
825 setup_rx_reqs(dev);
826 spin_unlock_irqrestore(&dev->lock, flags);
827 spin_unlock(&dev->lock_printer_io);
828
829 poll_wait(fd, &dev->rx_wait, wait);
830 poll_wait(fd, &dev->tx_wait, wait);
831
832 spin_lock_irqsave(&dev->lock, flags);
833 if (likely(!list_empty(&dev->tx_reqs)))
834 status |= POLLOUT | POLLWRNORM;
835
836 if (likely(dev->current_rx_bytes) ||
837 likely(!list_empty(&dev->rx_buffers)))
838 status |= POLLIN | POLLRDNORM;
839
840 spin_unlock_irqrestore(&dev->lock, flags);
841
842 return status;
843 }
844
845 static long
printer_ioctl(struct file * fd,unsigned int code,unsigned long arg)846 printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
847 {
848 struct printer_dev *dev = fd->private_data;
849 unsigned long flags;
850 int status = 0;
851
852 DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
853
854 /* handle ioctls */
855
856 spin_lock_irqsave(&dev->lock, flags);
857
858 switch (code) {
859 case GADGET_GET_PRINTER_STATUS:
860 status = (int)dev->printer_status;
861 break;
862 case GADGET_SET_PRINTER_STATUS:
863 dev->printer_status = (u8)arg;
864 break;
865 default:
866 /* could not handle ioctl */
867 DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
868 code);
869 status = -ENOTTY;
870 }
871
872 spin_unlock_irqrestore(&dev->lock, flags);
873
874 return status;
875 }
876
877 /* used after endpoint configuration */
878 static struct file_operations printer_io_operations = {
879 .owner = THIS_MODULE,
880 .open = printer_open,
881 .read = printer_read,
882 .write = printer_write,
883 .fsync = printer_fsync,
884 .poll = printer_poll,
885 .unlocked_ioctl = printer_ioctl,
886 .release = printer_close
887 };
888
889 /*-------------------------------------------------------------------------*/
890
891 static int
set_printer_interface(struct printer_dev * dev)892 set_printer_interface(struct printer_dev *dev)
893 {
894 int result = 0;
895
896 dev->in = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
897 dev->in_ep->driver_data = dev;
898
899 dev->out = ep_desc(dev->gadget, &hs_ep_out_desc, &fs_ep_out_desc);
900 dev->out_ep->driver_data = dev;
901
902 result = usb_ep_enable(dev->in_ep, dev->in);
903 if (result != 0) {
904 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
905 goto done;
906 }
907
908 result = usb_ep_enable(dev->out_ep, dev->out);
909 if (result != 0) {
910 DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
911 goto done;
912 }
913
914 done:
915 /* on error, disable any endpoints */
916 if (result != 0) {
917 (void) usb_ep_disable(dev->in_ep);
918 (void) usb_ep_disable(dev->out_ep);
919 dev->in = NULL;
920 dev->out = NULL;
921 }
922
923 /* caller is responsible for cleanup on error */
924 return result;
925 }
926
printer_reset_interface(struct printer_dev * dev)927 static void printer_reset_interface(struct printer_dev *dev)
928 {
929 if (dev->interface < 0)
930 return;
931
932 DBG(dev, "%s\n", __func__);
933
934 if (dev->in)
935 usb_ep_disable(dev->in_ep);
936
937 if (dev->out)
938 usb_ep_disable(dev->out_ep);
939
940 dev->interface = -1;
941 }
942
943 /* change our operational config. must agree with the code
944 * that returns config descriptors, and altsetting code.
945 */
946 static int
printer_set_config(struct printer_dev * dev,unsigned number)947 printer_set_config(struct printer_dev *dev, unsigned number)
948 {
949 int result = 0;
950 struct usb_gadget *gadget = dev->gadget;
951
952 if (gadget_is_sa1100(gadget) && dev->config) {
953 /* tx fifo is full, but we can't clear it...*/
954 INFO(dev, "can't change configurations\n");
955 return -ESPIPE;
956 }
957
958 switch (number) {
959 case DEV_CONFIG_VALUE:
960 result = 0;
961 break;
962 default:
963 result = -EINVAL;
964 /* FALL THROUGH */
965 case 0:
966 break;
967 }
968
969 if (result) {
970 usb_gadget_vbus_draw(dev->gadget,
971 dev->gadget->is_otg ? 8 : 100);
972 } else {
973 char *speed;
974 unsigned power;
975
976 power = 2 * config_desc.bMaxPower;
977 usb_gadget_vbus_draw(dev->gadget, power);
978
979 switch (gadget->speed) {
980 case USB_SPEED_FULL: speed = "full"; break;
981 #ifdef CONFIG_USB_GADGET_DUALSPEED
982 case USB_SPEED_HIGH: speed = "high"; break;
983 #endif
984 default: speed = "?"; break;
985 }
986
987 dev->config = number;
988 INFO(dev, "%s speed config #%d: %d mA, %s\n",
989 speed, number, power, driver_desc);
990 }
991 return result;
992 }
993
994 static int
config_buf(enum usb_device_speed speed,u8 * buf,u8 type,unsigned index,int is_otg)995 config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index,
996 int is_otg)
997 {
998 int len;
999 const struct usb_descriptor_header **function;
1000 #ifdef CONFIG_USB_GADGET_DUALSPEED
1001 int hs = (speed == USB_SPEED_HIGH);
1002
1003 if (type == USB_DT_OTHER_SPEED_CONFIG)
1004 hs = !hs;
1005
1006 if (hs) {
1007 function = hs_printer_function;
1008 } else {
1009 function = fs_printer_function;
1010 }
1011 #else
1012 function = fs_printer_function;
1013 #endif
1014
1015 if (index >= device_desc.bNumConfigurations)
1016 return -EINVAL;
1017
1018 /* for now, don't advertise srp-only devices */
1019 if (!is_otg)
1020 function++;
1021
1022 len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE,
1023 function);
1024 if (len < 0)
1025 return len;
1026 ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1027 return len;
1028 }
1029
1030 /* Change our operational Interface. */
1031 static int
set_interface(struct printer_dev * dev,unsigned number)1032 set_interface(struct printer_dev *dev, unsigned number)
1033 {
1034 int result = 0;
1035
1036 if (gadget_is_sa1100(dev->gadget) && dev->interface < 0) {
1037 /* tx fifo is full, but we can't clear it...*/
1038 INFO(dev, "can't change interfaces\n");
1039 return -ESPIPE;
1040 }
1041
1042 /* Free the current interface */
1043 switch (dev->interface) {
1044 case PRINTER_INTERFACE:
1045 printer_reset_interface(dev);
1046 break;
1047 }
1048
1049 switch (number) {
1050 case PRINTER_INTERFACE:
1051 result = set_printer_interface(dev);
1052 if (result) {
1053 printer_reset_interface(dev);
1054 } else {
1055 dev->interface = PRINTER_INTERFACE;
1056 }
1057 break;
1058 default:
1059 result = -EINVAL;
1060 /* FALL THROUGH */
1061 }
1062
1063 if (!result)
1064 INFO(dev, "Using interface %x\n", number);
1065
1066 return result;
1067 }
1068
printer_setup_complete(struct usb_ep * ep,struct usb_request * req)1069 static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req)
1070 {
1071 if (req->status || req->actual != req->length)
1072 DBG((struct printer_dev *) ep->driver_data,
1073 "setup complete --> %d, %d/%d\n",
1074 req->status, req->actual, req->length);
1075 }
1076
printer_soft_reset(struct printer_dev * dev)1077 static void printer_soft_reset(struct printer_dev *dev)
1078 {
1079 struct usb_request *req;
1080
1081 INFO(dev, "Received Printer Reset Request\n");
1082
1083 if (usb_ep_disable(dev->in_ep))
1084 DBG(dev, "Failed to disable USB in_ep\n");
1085 if (usb_ep_disable(dev->out_ep))
1086 DBG(dev, "Failed to disable USB out_ep\n");
1087
1088 if (dev->current_rx_req != NULL) {
1089 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
1090 dev->current_rx_req = NULL;
1091 }
1092 dev->current_rx_bytes = 0;
1093 dev->current_rx_buf = NULL;
1094 dev->reset_printer = 1;
1095
1096 while (likely(!(list_empty(&dev->rx_buffers)))) {
1097 req = container_of(dev->rx_buffers.next, struct usb_request,
1098 list);
1099 list_del_init(&req->list);
1100 list_add(&req->list, &dev->rx_reqs);
1101 }
1102
1103 while (likely(!(list_empty(&dev->rx_reqs_active)))) {
1104 req = container_of(dev->rx_buffers.next, struct usb_request,
1105 list);
1106 list_del_init(&req->list);
1107 list_add(&req->list, &dev->rx_reqs);
1108 }
1109
1110 while (likely(!(list_empty(&dev->tx_reqs_active)))) {
1111 req = container_of(dev->tx_reqs_active.next,
1112 struct usb_request, list);
1113 list_del_init(&req->list);
1114 list_add(&req->list, &dev->tx_reqs);
1115 }
1116
1117 if (usb_ep_enable(dev->in_ep, dev->in))
1118 DBG(dev, "Failed to enable USB in_ep\n");
1119 if (usb_ep_enable(dev->out_ep, dev->out))
1120 DBG(dev, "Failed to enable USB out_ep\n");
1121
1122 wake_up_interruptible(&dev->rx_wait);
1123 wake_up_interruptible(&dev->tx_wait);
1124 wake_up_interruptible(&dev->tx_flush_wait);
1125 }
1126
1127 /*-------------------------------------------------------------------------*/
1128
1129 /*
1130 * The setup() callback implements all the ep0 functionality that's not
1131 * handled lower down.
1132 */
1133 static int
printer_setup(struct usb_gadget * gadget,const struct usb_ctrlrequest * ctrl)1134 printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1135 {
1136 struct printer_dev *dev = get_gadget_data(gadget);
1137 struct usb_request *req = dev->req;
1138 int value = -EOPNOTSUPP;
1139 u16 wIndex = le16_to_cpu(ctrl->wIndex);
1140 u16 wValue = le16_to_cpu(ctrl->wValue);
1141 u16 wLength = le16_to_cpu(ctrl->wLength);
1142
1143 DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
1144 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
1145
1146 req->complete = printer_setup_complete;
1147
1148 switch (ctrl->bRequestType&USB_TYPE_MASK) {
1149
1150 case USB_TYPE_STANDARD:
1151 switch (ctrl->bRequest) {
1152
1153 case USB_REQ_GET_DESCRIPTOR:
1154 if (ctrl->bRequestType != USB_DIR_IN)
1155 break;
1156 switch (wValue >> 8) {
1157
1158 case USB_DT_DEVICE:
1159 value = min(wLength, (u16) sizeof device_desc);
1160 memcpy(req->buf, &device_desc, value);
1161 break;
1162 #ifdef CONFIG_USB_GADGET_DUALSPEED
1163 case USB_DT_DEVICE_QUALIFIER:
1164 if (!gadget->is_dualspeed)
1165 break;
1166 value = min(wLength,
1167 (u16) sizeof dev_qualifier);
1168 memcpy(req->buf, &dev_qualifier, value);
1169 break;
1170
1171 case USB_DT_OTHER_SPEED_CONFIG:
1172 if (!gadget->is_dualspeed)
1173 break;
1174 /* FALLTHROUGH */
1175 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1176 case USB_DT_CONFIG:
1177 value = config_buf(gadget->speed, req->buf,
1178 wValue >> 8,
1179 wValue & 0xff,
1180 gadget->is_otg);
1181 if (value >= 0)
1182 value = min(wLength, (u16) value);
1183 break;
1184
1185 case USB_DT_STRING:
1186 value = usb_gadget_get_string(&stringtab,
1187 wValue & 0xff, req->buf);
1188 if (value >= 0)
1189 value = min(wLength, (u16) value);
1190 break;
1191 }
1192 break;
1193
1194 case USB_REQ_SET_CONFIGURATION:
1195 if (ctrl->bRequestType != 0)
1196 break;
1197 if (gadget->a_hnp_support)
1198 DBG(dev, "HNP available\n");
1199 else if (gadget->a_alt_hnp_support)
1200 DBG(dev, "HNP needs a different root port\n");
1201 value = printer_set_config(dev, wValue);
1202 break;
1203 case USB_REQ_GET_CONFIGURATION:
1204 if (ctrl->bRequestType != USB_DIR_IN)
1205 break;
1206 *(u8 *)req->buf = dev->config;
1207 value = min(wLength, (u16) 1);
1208 break;
1209
1210 case USB_REQ_SET_INTERFACE:
1211 if (ctrl->bRequestType != USB_RECIP_INTERFACE ||
1212 !dev->config)
1213 break;
1214
1215 value = set_interface(dev, PRINTER_INTERFACE);
1216 break;
1217 case USB_REQ_GET_INTERFACE:
1218 if (ctrl->bRequestType !=
1219 (USB_DIR_IN|USB_RECIP_INTERFACE)
1220 || !dev->config)
1221 break;
1222
1223 *(u8 *)req->buf = dev->interface;
1224 value = min(wLength, (u16) 1);
1225 break;
1226
1227 default:
1228 goto unknown;
1229 }
1230 break;
1231
1232 case USB_TYPE_CLASS:
1233 switch (ctrl->bRequest) {
1234 case 0: /* Get the IEEE-1284 PNP String */
1235 /* Only one printer interface is supported. */
1236 if ((wIndex>>8) != PRINTER_INTERFACE)
1237 break;
1238
1239 value = (pnp_string[0]<<8)|pnp_string[1];
1240 memcpy(req->buf, pnp_string, value);
1241 DBG(dev, "1284 PNP String: %x %s\n", value,
1242 &pnp_string[2]);
1243 break;
1244
1245 case 1: /* Get Port Status */
1246 /* Only one printer interface is supported. */
1247 if (wIndex != PRINTER_INTERFACE)
1248 break;
1249
1250 *(u8 *)req->buf = dev->printer_status;
1251 value = min(wLength, (u16) 1);
1252 break;
1253
1254 case 2: /* Soft Reset */
1255 /* Only one printer interface is supported. */
1256 if (wIndex != PRINTER_INTERFACE)
1257 break;
1258
1259 printer_soft_reset(dev);
1260
1261 value = 0;
1262 break;
1263
1264 default:
1265 goto unknown;
1266 }
1267 break;
1268
1269 default:
1270 unknown:
1271 VDBG(dev,
1272 "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1273 ctrl->bRequestType, ctrl->bRequest,
1274 wValue, wIndex, wLength);
1275 break;
1276 }
1277
1278 /* respond with data transfer before status phase? */
1279 if (value >= 0) {
1280 req->length = value;
1281 req->zero = value < wLength;
1282 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1283 if (value < 0) {
1284 DBG(dev, "ep_queue --> %d\n", value);
1285 req->status = 0;
1286 printer_setup_complete(gadget->ep0, req);
1287 }
1288 }
1289
1290 /* host either stalls (value < 0) or reports success */
1291 return value;
1292 }
1293
1294 static void
printer_disconnect(struct usb_gadget * gadget)1295 printer_disconnect(struct usb_gadget *gadget)
1296 {
1297 struct printer_dev *dev = get_gadget_data(gadget);
1298 unsigned long flags;
1299
1300 DBG(dev, "%s\n", __func__);
1301
1302 spin_lock_irqsave(&dev->lock, flags);
1303
1304 printer_reset_interface(dev);
1305
1306 spin_unlock_irqrestore(&dev->lock, flags);
1307 }
1308
1309 static void
printer_unbind(struct usb_gadget * gadget)1310 printer_unbind(struct usb_gadget *gadget)
1311 {
1312 struct printer_dev *dev = get_gadget_data(gadget);
1313 struct usb_request *req;
1314
1315
1316 DBG(dev, "%s\n", __func__);
1317
1318 /* Remove sysfs files */
1319 device_destroy(usb_gadget_class, g_printer_devno);
1320
1321 /* Remove Character Device */
1322 cdev_del(&dev->printer_cdev);
1323
1324 /* we must already have been disconnected ... no i/o may be active */
1325 WARN_ON(!list_empty(&dev->tx_reqs_active));
1326 WARN_ON(!list_empty(&dev->rx_reqs_active));
1327
1328 /* Free all memory for this driver. */
1329 while (!list_empty(&dev->tx_reqs)) {
1330 req = container_of(dev->tx_reqs.next, struct usb_request,
1331 list);
1332 list_del(&req->list);
1333 printer_req_free(dev->in_ep, req);
1334 }
1335
1336 if (dev->current_rx_req != NULL)
1337 printer_req_free(dev->out_ep, dev->current_rx_req);
1338
1339 while (!list_empty(&dev->rx_reqs)) {
1340 req = container_of(dev->rx_reqs.next,
1341 struct usb_request, list);
1342 list_del(&req->list);
1343 printer_req_free(dev->out_ep, req);
1344 }
1345
1346 while (!list_empty(&dev->rx_buffers)) {
1347 req = container_of(dev->rx_buffers.next,
1348 struct usb_request, list);
1349 list_del(&req->list);
1350 printer_req_free(dev->out_ep, req);
1351 }
1352
1353 if (dev->req) {
1354 printer_req_free(gadget->ep0, dev->req);
1355 dev->req = NULL;
1356 }
1357
1358 set_gadget_data(gadget, NULL);
1359 }
1360
1361 static int __init
printer_bind(struct usb_gadget * gadget)1362 printer_bind(struct usb_gadget *gadget)
1363 {
1364 struct printer_dev *dev;
1365 struct usb_ep *in_ep, *out_ep;
1366 int status = -ENOMEM;
1367 int gcnum;
1368 size_t len;
1369 u32 i;
1370 struct usb_request *req;
1371
1372 dev = &usb_printer_gadget;
1373
1374
1375 /* Setup the sysfs files for the printer gadget. */
1376 dev->pdev = device_create(usb_gadget_class, NULL, g_printer_devno,
1377 NULL, "g_printer");
1378 if (IS_ERR(dev->pdev)) {
1379 ERROR(dev, "Failed to create device: g_printer\n");
1380 goto fail;
1381 }
1382
1383 /*
1384 * Register a character device as an interface to a user mode
1385 * program that handles the printer specific functionality.
1386 */
1387 cdev_init(&dev->printer_cdev, &printer_io_operations);
1388 dev->printer_cdev.owner = THIS_MODULE;
1389 status = cdev_add(&dev->printer_cdev, g_printer_devno, 1);
1390 if (status) {
1391 ERROR(dev, "Failed to open char device\n");
1392 goto fail;
1393 }
1394
1395 if (gadget_is_sa1100(gadget)) {
1396 /* hardware can't write zero length packets. */
1397 ERROR(dev, "SA1100 controller is unsupport by this driver\n");
1398 goto fail;
1399 }
1400
1401 gcnum = usb_gadget_controller_number(gadget);
1402 if (gcnum >= 0) {
1403 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
1404 } else {
1405 dev_warn(&gadget->dev, "controller '%s' not recognized\n",
1406 gadget->name);
1407 /* unrecognized, but safe unless bulk is REALLY quirky */
1408 device_desc.bcdDevice =
1409 __constant_cpu_to_le16(0xFFFF);
1410 }
1411 snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1412 init_utsname()->sysname, init_utsname()->release,
1413 gadget->name);
1414
1415 device_desc.idVendor =
1416 __constant_cpu_to_le16(PRINTER_VENDOR_NUM);
1417 device_desc.idProduct =
1418 __constant_cpu_to_le16(PRINTER_PRODUCT_NUM);
1419
1420 /* support optional vendor/distro customization */
1421 if (idVendor) {
1422 if (!idProduct) {
1423 dev_err(&gadget->dev, "idVendor needs idProduct!\n");
1424 return -ENODEV;
1425 }
1426 device_desc.idVendor = cpu_to_le16(idVendor);
1427 device_desc.idProduct = cpu_to_le16(idProduct);
1428 if (bcdDevice)
1429 device_desc.bcdDevice = cpu_to_le16(bcdDevice);
1430 }
1431
1432 if (iManufacturer)
1433 strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
1434
1435 if (iProduct)
1436 strlcpy(product_desc, iProduct, sizeof product_desc);
1437
1438 if (iSerialNum)
1439 strlcpy(serial_num, iSerialNum, sizeof serial_num);
1440
1441 if (iPNPstring)
1442 strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2);
1443
1444 len = strlen(pnp_string);
1445 pnp_string[0] = (len >> 8) & 0xFF;
1446 pnp_string[1] = len & 0xFF;
1447
1448 /* all we really need is bulk IN/OUT */
1449 usb_ep_autoconfig_reset(gadget);
1450 in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc);
1451 if (!in_ep) {
1452 autoconf_fail:
1453 dev_err(&gadget->dev, "can't autoconfigure on %s\n",
1454 gadget->name);
1455 return -ENODEV;
1456 }
1457 in_ep->driver_data = in_ep; /* claim */
1458
1459 out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc);
1460 if (!out_ep)
1461 goto autoconf_fail;
1462 out_ep->driver_data = out_ep; /* claim */
1463
1464 #ifdef CONFIG_USB_GADGET_DUALSPEED
1465 /* assumes ep0 uses the same value for both speeds ... */
1466 dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
1467
1468 /* and that all endpoints are dual-speed */
1469 hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1470 hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1471 #endif /* DUALSPEED */
1472
1473 device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1474 usb_gadget_set_selfpowered(gadget);
1475
1476 if (gadget->is_otg) {
1477 otg_desc.bmAttributes |= USB_OTG_HNP,
1478 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1479 }
1480
1481 spin_lock_init(&dev->lock);
1482 spin_lock_init(&dev->lock_printer_io);
1483 INIT_LIST_HEAD(&dev->tx_reqs);
1484 INIT_LIST_HEAD(&dev->tx_reqs_active);
1485 INIT_LIST_HEAD(&dev->rx_reqs);
1486 INIT_LIST_HEAD(&dev->rx_reqs_active);
1487 INIT_LIST_HEAD(&dev->rx_buffers);
1488 init_waitqueue_head(&dev->rx_wait);
1489 init_waitqueue_head(&dev->tx_wait);
1490 init_waitqueue_head(&dev->tx_flush_wait);
1491
1492 dev->config = 0;
1493 dev->interface = -1;
1494 dev->printer_cdev_open = 0;
1495 dev->printer_status = PRINTER_NOT_ERROR;
1496 dev->current_rx_req = NULL;
1497 dev->current_rx_bytes = 0;
1498 dev->current_rx_buf = NULL;
1499
1500 dev->in_ep = in_ep;
1501 dev->out_ep = out_ep;
1502
1503 /* preallocate control message data and buffer */
1504 dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE,
1505 GFP_KERNEL);
1506 if (!dev->req) {
1507 status = -ENOMEM;
1508 goto fail;
1509 }
1510
1511 for (i = 0; i < QLEN; i++) {
1512 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1513 if (!req) {
1514 while (!list_empty(&dev->tx_reqs)) {
1515 req = container_of(dev->tx_reqs.next,
1516 struct usb_request, list);
1517 list_del(&req->list);
1518 printer_req_free(dev->in_ep, req);
1519 }
1520 return -ENOMEM;
1521 }
1522 list_add(&req->list, &dev->tx_reqs);
1523 }
1524
1525 for (i = 0; i < QLEN; i++) {
1526 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1527 if (!req) {
1528 while (!list_empty(&dev->rx_reqs)) {
1529 req = container_of(dev->rx_reqs.next,
1530 struct usb_request, list);
1531 list_del(&req->list);
1532 printer_req_free(dev->out_ep, req);
1533 }
1534 return -ENOMEM;
1535 }
1536 list_add(&req->list, &dev->rx_reqs);
1537 }
1538
1539 dev->req->complete = printer_setup_complete;
1540
1541 /* finish hookup to lower layer ... */
1542 dev->gadget = gadget;
1543 set_gadget_data(gadget, dev);
1544 gadget->ep0->driver_data = dev;
1545
1546 INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
1547 INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name,
1548 in_ep->name);
1549
1550 return 0;
1551
1552 fail:
1553 printer_unbind(gadget);
1554 return status;
1555 }
1556
1557 /*-------------------------------------------------------------------------*/
1558
1559 static struct usb_gadget_driver printer_driver = {
1560 .speed = DEVSPEED,
1561
1562 .function = (char *) driver_desc,
1563 .bind = printer_bind,
1564 .unbind = printer_unbind,
1565
1566 .setup = printer_setup,
1567 .disconnect = printer_disconnect,
1568
1569 .driver = {
1570 .name = (char *) shortname,
1571 .owner = THIS_MODULE,
1572 },
1573 };
1574
1575 MODULE_DESCRIPTION(DRIVER_DESC);
1576 MODULE_AUTHOR("Craig Nadler");
1577 MODULE_LICENSE("GPL");
1578
1579 static int __init
init(void)1580 init(void)
1581 {
1582 int status;
1583
1584 usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1585 if (IS_ERR(usb_gadget_class)) {
1586 status = PTR_ERR(usb_gadget_class);
1587 ERROR(dev, "unable to create usb_gadget class %d\n", status);
1588 return status;
1589 }
1590
1591 status = alloc_chrdev_region(&g_printer_devno, 0, 1,
1592 "USB printer gadget");
1593 if (status) {
1594 ERROR(dev, "alloc_chrdev_region %d\n", status);
1595 class_destroy(usb_gadget_class);
1596 return status;
1597 }
1598
1599 status = usb_gadget_register_driver(&printer_driver);
1600 if (status) {
1601 class_destroy(usb_gadget_class);
1602 unregister_chrdev_region(g_printer_devno, 1);
1603 DBG(dev, "usb_gadget_register_driver %x\n", status);
1604 }
1605
1606 return status;
1607 }
1608 module_init(init);
1609
1610 static void __exit
cleanup(void)1611 cleanup(void)
1612 {
1613 int status;
1614
1615 spin_lock(&usb_printer_gadget.lock_printer_io);
1616 class_destroy(usb_gadget_class);
1617 unregister_chrdev_region(g_printer_devno, 2);
1618
1619 status = usb_gadget_unregister_driver(&printer_driver);
1620 if (status)
1621 ERROR(dev, "usb_gadget_unregister_driver %x\n", status);
1622
1623 spin_unlock(&usb_printer_gadget.lock_printer_io);
1624 }
1625 module_exit(cleanup);
1626