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Craig W. Nadler25a010c2007-11-11 15:00:15 -08001/*
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
David Brownell0a56b032008-08-18 17:42:49 -070056
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
Craig W. Nadler25a010c2007-11-11 15:00:15 -080070#define DRIVER_DESC "Printer Gadget"
71#define DRIVER_VERSION "2007 OCT 06"
72
73static const char shortname [] = "printer";
74static const char driver_desc [] = DRIVER_DESC;
75
76static dev_t g_printer_devno;
77
78static struct class *usb_gadget_class;
79
80/*-------------------------------------------------------------------------*/
81
82struct 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;
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800109 struct cdev printer_cdev;
110 struct device *pdev;
111 u8 printer_cdev_open;
112 wait_queue_head_t wait;
113};
114
115static 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
133static ushort __initdata idVendor;
134module_param(idVendor, ushort, S_IRUGO);
135MODULE_PARM_DESC(idVendor, "USB Vendor ID");
136
137static ushort __initdata idProduct;
138module_param(idProduct, ushort, S_IRUGO);
139MODULE_PARM_DESC(idProduct, "USB Product ID");
140
141static ushort __initdata bcdDevice;
142module_param(bcdDevice, ushort, S_IRUGO);
143MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
144
145static char *__initdata iManufacturer;
146module_param(iManufacturer, charp, S_IRUGO);
147MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
148
149static char *__initdata iProduct;
150module_param(iProduct, charp, S_IRUGO);
151MODULE_PARM_DESC(iProduct, "USB Product string");
152
153static char *__initdata iSerialNum;
154module_param(iSerialNum, charp, S_IRUGO);
155MODULE_PARM_DESC(iSerialNum, "1");
156
157static char *__initdata iPNPstring;
158module_param(iPNPstring, charp, S_IRUGO);
159MODULE_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. */
162static unsigned qlen = 10;
163module_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)
Arjan van de Venb6c63932008-07-25 01:45:52 -0700196#define WARNING(dev, fmt, args...) \
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800197 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
225static struct usb_device_descriptor device_desc = {
226 .bLength = sizeof device_desc,
227 .bDescriptorType = USB_DT_DEVICE,
Harvey Harrison551509d2009-02-11 14:11:36 -0800228 .bcdUSB = cpu_to_le16(0x0200),
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800229 .bDeviceClass = USB_CLASS_PER_INTERFACE,
230 .bDeviceSubClass = 0,
231 .bDeviceProtocol = 0,
Harvey Harrison551509d2009-02-11 14:11:36 -0800232 .idVendor = cpu_to_le16(PRINTER_VENDOR_NUM),
233 .idProduct = cpu_to_le16(PRINTER_PRODUCT_NUM),
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800234 .iManufacturer = STRING_MANUFACTURER,
235 .iProduct = STRING_PRODUCT,
236 .iSerialNumber = STRING_SERIALNUM,
237 .bNumConfigurations = 1
238};
239
240static struct usb_otg_descriptor otg_desc = {
241 .bLength = sizeof otg_desc,
242 .bDescriptorType = USB_DT_OTG,
243 .bmAttributes = USB_OTG_SRP
244};
245
246static 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,
David Brownell36e893d2008-09-12 09:39:06 -0700255 .bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2,
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800256};
257
258static 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
269static 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
276static 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
283static 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
298static 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,
Harvey Harrison551509d2009-02-11 14:11:36 -0800302 .wMaxPacketSize = cpu_to_le16(512)
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800303};
304
305static 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,
Harvey Harrison551509d2009-02-11 14:11:36 -0800309 .wMaxPacketSize = cpu_to_le16(512)
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800310};
311
312static struct usb_qualifier_descriptor dev_qualifier = {
313 .bLength = sizeof dev_qualifier,
314 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
Harvey Harrison551509d2009-02-11 14:11:36 -0800315 .bcdUSB = cpu_to_le16(0x0200),
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800316 .bDeviceClass = USB_CLASS_PRINTER,
317 .bNumConfigurations = 1
318};
319
320static 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
342static char manufacturer [50];
343static char product_desc [40] = DRIVER_DESC;
344static char serial_num [40] = "1";
345static char pnp_string [1024] =
346 "XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
347
348/* static strings, in UTF-8 */
349static struct usb_string strings [] = {
350 { STRING_MANUFACTURER, manufacturer, },
351 { STRING_PRODUCT, product_desc, },
352 { STRING_SERIALNUM, serial_num, },
353 { } /* end of list */
354};
355
356static struct usb_gadget_strings stringtab = {
357 .language = 0x0409, /* en-us */
358 .strings = strings,
359};
360
361/*-------------------------------------------------------------------------*/
362
363static struct usb_request *
364printer_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
382static void
383printer_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
393static 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:
Craig W. Nadlercc901bb2008-03-20 14:46:26 -0700407 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 }
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800413 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 }
Craig W. Nadlercc901bb2008-03-20 14:46:26 -0700437
438 wake_up_interruptible(&dev->rx_wait);
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800439 spin_unlock_irqrestore(&dev->lock, flags);
440}
441
442static 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
472static int
473printer_open(struct inode *inode, struct file *fd)
474{
475 struct printer_dev *dev;
476 unsigned long flags;
477 int ret = -EBUSY;
478
Jonathan Corbetb2f2ba02008-05-16 14:21:30 -0600479 lock_kernel();
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800480 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);
Jonathan Corbetb2f2ba02008-05-16 14:21:30 -0600495 unlock_kernel();
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800496 return ret;
497}
498
499static int
500printer_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
Craig W. Nadlercc901bb2008-03-20 14:46:26 -0700517/* This function must be called with interrupts turned off. */
518static void
519setup_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
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800550static ssize_t
551printer_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
Craig W. Nadlercc901bb2008-03-20 14:46:26 -0700578 setup_rx_reqs(dev);
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800579
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
Craig W. Nadlercc901bb2008-03-20 14:46:26 -0700647 /* We've disconnected or reset so return. */
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800648 if (dev->reset_printer) {
Craig W. Nadlercc901bb2008-03-20 14:46:26 -0700649 list_add(&current_rx_req->list, &dev->rx_reqs);
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800650 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(&current_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
686static ssize_t
687printer_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) {
Craig W. Nadlercc901bb2008-03-20 14:46:26 -0700767 list_add(&req->list, &dev->tx_reqs);
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800768 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
796static int
797printer_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
816static unsigned int
817printer_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
Craig W. Nadlercc901bb2008-03-20 14:46:26 -0700823 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
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800829 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
Craig W. Nadlercc901bb2008-03-20 14:46:26 -0700836 if (likely(dev->current_rx_bytes) ||
837 likely(!list_empty(&dev->rx_buffers)))
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800838 status |= POLLIN | POLLRDNORM;
839
840 spin_unlock_irqrestore(&dev->lock, flags);
841
842 return status;
843}
844
Alan Cox44c389a2008-05-22 22:03:27 +0100845static long
846printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800847{
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 */
Alexey Dobriyan828c0952009-10-01 15:43:56 -0700878static const struct file_operations printer_io_operations = {
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800879 .owner = THIS_MODULE,
880 .open = printer_open,
881 .read = printer_read,
882 .write = printer_write,
883 .fsync = printer_fsync,
884 .poll = printer_poll,
Alan Cox44c389a2008-05-22 22:03:27 +0100885 .unlocked_ioctl = printer_ioctl,
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800886 .release = printer_close
887};
888
889/*-------------------------------------------------------------------------*/
890
891static int
892set_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
914done:
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
927static void printer_reset_interface(struct printer_dev *dev)
928{
929 if (dev->interface < 0)
930 return;
931
Harvey Harrison441b62c2008-03-03 16:08:34 -0800932 DBG(dev, "%s\n", __func__);
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800933
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 */
946static int
947printer_set_config(struct printer_dev *dev, unsigned number)
948{
949 int result = 0;
950 struct usb_gadget *gadget = dev->gadget;
951
Craig W. Nadler25a010c2007-11-11 15:00:15 -0800952 switch (number) {
953 case DEV_CONFIG_VALUE:
954 result = 0;
955 break;
956 default:
957 result = -EINVAL;
958 /* FALL THROUGH */
959 case 0:
960 break;
961 }
962
963 if (result) {
964 usb_gadget_vbus_draw(dev->gadget,
965 dev->gadget->is_otg ? 8 : 100);
966 } else {
967 char *speed;
968 unsigned power;
969
970 power = 2 * config_desc.bMaxPower;
971 usb_gadget_vbus_draw(dev->gadget, power);
972
973 switch (gadget->speed) {
974 case USB_SPEED_FULL: speed = "full"; break;
975#ifdef CONFIG_USB_GADGET_DUALSPEED
976 case USB_SPEED_HIGH: speed = "high"; break;
977#endif
978 default: speed = "?"; break;
979 }
980
981 dev->config = number;
982 INFO(dev, "%s speed config #%d: %d mA, %s\n",
983 speed, number, power, driver_desc);
984 }
985 return result;
986}
987
988static int
989config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index,
990 int is_otg)
991{
992 int len;
993 const struct usb_descriptor_header **function;
994#ifdef CONFIG_USB_GADGET_DUALSPEED
995 int hs = (speed == USB_SPEED_HIGH);
996
997 if (type == USB_DT_OTHER_SPEED_CONFIG)
998 hs = !hs;
999
1000 if (hs) {
1001 function = hs_printer_function;
1002 } else {
1003 function = fs_printer_function;
1004 }
1005#else
1006 function = fs_printer_function;
1007#endif
1008
1009 if (index >= device_desc.bNumConfigurations)
1010 return -EINVAL;
1011
1012 /* for now, don't advertise srp-only devices */
1013 if (!is_otg)
1014 function++;
1015
1016 len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE,
1017 function);
1018 if (len < 0)
1019 return len;
1020 ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
1021 return len;
1022}
1023
1024/* Change our operational Interface. */
1025static int
1026set_interface(struct printer_dev *dev, unsigned number)
1027{
1028 int result = 0;
1029
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001030 /* Free the current interface */
1031 switch (dev->interface) {
1032 case PRINTER_INTERFACE:
1033 printer_reset_interface(dev);
1034 break;
1035 }
1036
1037 switch (number) {
1038 case PRINTER_INTERFACE:
1039 result = set_printer_interface(dev);
1040 if (result) {
1041 printer_reset_interface(dev);
1042 } else {
1043 dev->interface = PRINTER_INTERFACE;
1044 }
1045 break;
1046 default:
1047 result = -EINVAL;
1048 /* FALL THROUGH */
1049 }
1050
1051 if (!result)
1052 INFO(dev, "Using interface %x\n", number);
1053
1054 return result;
1055}
1056
1057static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req)
1058{
1059 if (req->status || req->actual != req->length)
1060 DBG((struct printer_dev *) ep->driver_data,
1061 "setup complete --> %d, %d/%d\n",
1062 req->status, req->actual, req->length);
1063}
1064
1065static void printer_soft_reset(struct printer_dev *dev)
1066{
1067 struct usb_request *req;
1068
1069 INFO(dev, "Received Printer Reset Request\n");
1070
1071 if (usb_ep_disable(dev->in_ep))
1072 DBG(dev, "Failed to disable USB in_ep\n");
1073 if (usb_ep_disable(dev->out_ep))
1074 DBG(dev, "Failed to disable USB out_ep\n");
1075
1076 if (dev->current_rx_req != NULL) {
1077 list_add(&dev->current_rx_req->list, &dev->rx_reqs);
1078 dev->current_rx_req = NULL;
1079 }
1080 dev->current_rx_bytes = 0;
1081 dev->current_rx_buf = NULL;
1082 dev->reset_printer = 1;
1083
1084 while (likely(!(list_empty(&dev->rx_buffers)))) {
1085 req = container_of(dev->rx_buffers.next, struct usb_request,
1086 list);
1087 list_del_init(&req->list);
1088 list_add(&req->list, &dev->rx_reqs);
1089 }
1090
1091 while (likely(!(list_empty(&dev->rx_reqs_active)))) {
1092 req = container_of(dev->rx_buffers.next, struct usb_request,
1093 list);
1094 list_del_init(&req->list);
1095 list_add(&req->list, &dev->rx_reqs);
1096 }
1097
1098 while (likely(!(list_empty(&dev->tx_reqs_active)))) {
1099 req = container_of(dev->tx_reqs_active.next,
1100 struct usb_request, list);
1101 list_del_init(&req->list);
1102 list_add(&req->list, &dev->tx_reqs);
1103 }
1104
1105 if (usb_ep_enable(dev->in_ep, dev->in))
1106 DBG(dev, "Failed to enable USB in_ep\n");
1107 if (usb_ep_enable(dev->out_ep, dev->out))
1108 DBG(dev, "Failed to enable USB out_ep\n");
1109
Craig W. Nadlercc901bb2008-03-20 14:46:26 -07001110 wake_up_interruptible(&dev->rx_wait);
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001111 wake_up_interruptible(&dev->tx_wait);
1112 wake_up_interruptible(&dev->tx_flush_wait);
1113}
1114
1115/*-------------------------------------------------------------------------*/
1116
1117/*
1118 * The setup() callback implements all the ep0 functionality that's not
1119 * handled lower down.
1120 */
1121static int
1122printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1123{
1124 struct printer_dev *dev = get_gadget_data(gadget);
1125 struct usb_request *req = dev->req;
1126 int value = -EOPNOTSUPP;
1127 u16 wIndex = le16_to_cpu(ctrl->wIndex);
1128 u16 wValue = le16_to_cpu(ctrl->wValue);
1129 u16 wLength = le16_to_cpu(ctrl->wLength);
1130
1131 DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
1132 ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
1133
1134 req->complete = printer_setup_complete;
1135
1136 switch (ctrl->bRequestType&USB_TYPE_MASK) {
1137
1138 case USB_TYPE_STANDARD:
1139 switch (ctrl->bRequest) {
1140
1141 case USB_REQ_GET_DESCRIPTOR:
1142 if (ctrl->bRequestType != USB_DIR_IN)
1143 break;
1144 switch (wValue >> 8) {
1145
1146 case USB_DT_DEVICE:
1147 value = min(wLength, (u16) sizeof device_desc);
1148 memcpy(req->buf, &device_desc, value);
1149 break;
1150#ifdef CONFIG_USB_GADGET_DUALSPEED
1151 case USB_DT_DEVICE_QUALIFIER:
1152 if (!gadget->is_dualspeed)
1153 break;
1154 value = min(wLength,
1155 (u16) sizeof dev_qualifier);
1156 memcpy(req->buf, &dev_qualifier, value);
1157 break;
1158
1159 case USB_DT_OTHER_SPEED_CONFIG:
1160 if (!gadget->is_dualspeed)
1161 break;
1162 /* FALLTHROUGH */
1163#endif /* CONFIG_USB_GADGET_DUALSPEED */
1164 case USB_DT_CONFIG:
1165 value = config_buf(gadget->speed, req->buf,
1166 wValue >> 8,
1167 wValue & 0xff,
1168 gadget->is_otg);
1169 if (value >= 0)
1170 value = min(wLength, (u16) value);
1171 break;
1172
1173 case USB_DT_STRING:
1174 value = usb_gadget_get_string(&stringtab,
1175 wValue & 0xff, req->buf);
1176 if (value >= 0)
1177 value = min(wLength, (u16) value);
1178 break;
1179 }
1180 break;
1181
1182 case USB_REQ_SET_CONFIGURATION:
1183 if (ctrl->bRequestType != 0)
1184 break;
1185 if (gadget->a_hnp_support)
1186 DBG(dev, "HNP available\n");
1187 else if (gadget->a_alt_hnp_support)
1188 DBG(dev, "HNP needs a different root port\n");
1189 value = printer_set_config(dev, wValue);
1190 break;
1191 case USB_REQ_GET_CONFIGURATION:
1192 if (ctrl->bRequestType != USB_DIR_IN)
1193 break;
1194 *(u8 *)req->buf = dev->config;
1195 value = min(wLength, (u16) 1);
1196 break;
1197
1198 case USB_REQ_SET_INTERFACE:
1199 if (ctrl->bRequestType != USB_RECIP_INTERFACE ||
1200 !dev->config)
1201 break;
1202
1203 value = set_interface(dev, PRINTER_INTERFACE);
1204 break;
1205 case USB_REQ_GET_INTERFACE:
1206 if (ctrl->bRequestType !=
1207 (USB_DIR_IN|USB_RECIP_INTERFACE)
1208 || !dev->config)
1209 break;
1210
1211 *(u8 *)req->buf = dev->interface;
1212 value = min(wLength, (u16) 1);
1213 break;
1214
1215 default:
1216 goto unknown;
1217 }
1218 break;
1219
1220 case USB_TYPE_CLASS:
1221 switch (ctrl->bRequest) {
1222 case 0: /* Get the IEEE-1284 PNP String */
1223 /* Only one printer interface is supported. */
1224 if ((wIndex>>8) != PRINTER_INTERFACE)
1225 break;
1226
1227 value = (pnp_string[0]<<8)|pnp_string[1];
1228 memcpy(req->buf, pnp_string, value);
1229 DBG(dev, "1284 PNP String: %x %s\n", value,
1230 &pnp_string[2]);
1231 break;
1232
1233 case 1: /* Get Port Status */
1234 /* Only one printer interface is supported. */
1235 if (wIndex != PRINTER_INTERFACE)
1236 break;
1237
1238 *(u8 *)req->buf = dev->printer_status;
1239 value = min(wLength, (u16) 1);
1240 break;
1241
1242 case 2: /* Soft Reset */
1243 /* Only one printer interface is supported. */
1244 if (wIndex != PRINTER_INTERFACE)
1245 break;
1246
1247 printer_soft_reset(dev);
1248
1249 value = 0;
1250 break;
1251
1252 default:
1253 goto unknown;
1254 }
1255 break;
1256
1257 default:
1258unknown:
1259 VDBG(dev,
1260 "unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
1261 ctrl->bRequestType, ctrl->bRequest,
1262 wValue, wIndex, wLength);
1263 break;
1264 }
1265
1266 /* respond with data transfer before status phase? */
1267 if (value >= 0) {
1268 req->length = value;
SangSu Park82963452008-09-22 15:41:15 -07001269 req->zero = value < wLength;
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001270 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1271 if (value < 0) {
1272 DBG(dev, "ep_queue --> %d\n", value);
1273 req->status = 0;
1274 printer_setup_complete(gadget->ep0, req);
1275 }
1276 }
1277
1278 /* host either stalls (value < 0) or reports success */
1279 return value;
1280}
1281
1282static void
1283printer_disconnect(struct usb_gadget *gadget)
1284{
1285 struct printer_dev *dev = get_gadget_data(gadget);
1286 unsigned long flags;
1287
Harvey Harrison441b62c2008-03-03 16:08:34 -08001288 DBG(dev, "%s\n", __func__);
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001289
1290 spin_lock_irqsave(&dev->lock, flags);
1291
1292 printer_reset_interface(dev);
1293
1294 spin_unlock_irqrestore(&dev->lock, flags);
1295}
1296
1297static void
1298printer_unbind(struct usb_gadget *gadget)
1299{
1300 struct printer_dev *dev = get_gadget_data(gadget);
1301 struct usb_request *req;
1302
1303
Harvey Harrison441b62c2008-03-03 16:08:34 -08001304 DBG(dev, "%s\n", __func__);
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001305
1306 /* Remove sysfs files */
1307 device_destroy(usb_gadget_class, g_printer_devno);
1308
1309 /* Remove Character Device */
1310 cdev_del(&dev->printer_cdev);
1311
1312 /* we must already have been disconnected ... no i/o may be active */
1313 WARN_ON(!list_empty(&dev->tx_reqs_active));
1314 WARN_ON(!list_empty(&dev->rx_reqs_active));
1315
1316 /* Free all memory for this driver. */
1317 while (!list_empty(&dev->tx_reqs)) {
1318 req = container_of(dev->tx_reqs.next, struct usb_request,
1319 list);
1320 list_del(&req->list);
1321 printer_req_free(dev->in_ep, req);
1322 }
1323
Adrian Bunkefa66f12008-02-09 03:16:03 -08001324 if (dev->current_rx_req != NULL)
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001325 printer_req_free(dev->out_ep, dev->current_rx_req);
1326
1327 while (!list_empty(&dev->rx_reqs)) {
1328 req = container_of(dev->rx_reqs.next,
1329 struct usb_request, list);
1330 list_del(&req->list);
1331 printer_req_free(dev->out_ep, req);
1332 }
1333
1334 while (!list_empty(&dev->rx_buffers)) {
1335 req = container_of(dev->rx_buffers.next,
1336 struct usb_request, list);
1337 list_del(&req->list);
1338 printer_req_free(dev->out_ep, req);
1339 }
1340
1341 if (dev->req) {
1342 printer_req_free(gadget->ep0, dev->req);
1343 dev->req = NULL;
1344 }
1345
1346 set_gadget_data(gadget, NULL);
1347}
1348
1349static int __init
1350printer_bind(struct usb_gadget *gadget)
1351{
1352 struct printer_dev *dev;
1353 struct usb_ep *in_ep, *out_ep;
1354 int status = -ENOMEM;
1355 int gcnum;
1356 size_t len;
1357 u32 i;
1358 struct usb_request *req;
1359
1360 dev = &usb_printer_gadget;
1361
1362
1363 /* Setup the sysfs files for the printer gadget. */
Greg Kroah-Hartmanb0b090e2008-07-21 20:03:34 -07001364 dev->pdev = device_create(usb_gadget_class, NULL, g_printer_devno,
1365 NULL, "g_printer");
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001366 if (IS_ERR(dev->pdev)) {
1367 ERROR(dev, "Failed to create device: g_printer\n");
1368 goto fail;
1369 }
1370
1371 /*
1372 * Register a character device as an interface to a user mode
1373 * program that handles the printer specific functionality.
1374 */
1375 cdev_init(&dev->printer_cdev, &printer_io_operations);
1376 dev->printer_cdev.owner = THIS_MODULE;
1377 status = cdev_add(&dev->printer_cdev, g_printer_devno, 1);
1378 if (status) {
1379 ERROR(dev, "Failed to open char device\n");
1380 goto fail;
1381 }
1382
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001383 gcnum = usb_gadget_controller_number(gadget);
1384 if (gcnum >= 0) {
1385 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
1386 } else {
1387 dev_warn(&gadget->dev, "controller '%s' not recognized\n",
1388 gadget->name);
1389 /* unrecognized, but safe unless bulk is REALLY quirky */
1390 device_desc.bcdDevice =
Harvey Harrison551509d2009-02-11 14:11:36 -08001391 cpu_to_le16(0xFFFF);
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001392 }
1393 snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1394 init_utsname()->sysname, init_utsname()->release,
1395 gadget->name);
1396
1397 device_desc.idVendor =
Harvey Harrison551509d2009-02-11 14:11:36 -08001398 cpu_to_le16(PRINTER_VENDOR_NUM);
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001399 device_desc.idProduct =
Harvey Harrison551509d2009-02-11 14:11:36 -08001400 cpu_to_le16(PRINTER_PRODUCT_NUM);
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001401
1402 /* support optional vendor/distro customization */
1403 if (idVendor) {
1404 if (!idProduct) {
1405 dev_err(&gadget->dev, "idVendor needs idProduct!\n");
1406 return -ENODEV;
1407 }
1408 device_desc.idVendor = cpu_to_le16(idVendor);
1409 device_desc.idProduct = cpu_to_le16(idProduct);
1410 if (bcdDevice)
1411 device_desc.bcdDevice = cpu_to_le16(bcdDevice);
1412 }
1413
1414 if (iManufacturer)
1415 strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
1416
1417 if (iProduct)
1418 strlcpy(product_desc, iProduct, sizeof product_desc);
1419
1420 if (iSerialNum)
1421 strlcpy(serial_num, iSerialNum, sizeof serial_num);
1422
1423 if (iPNPstring)
1424 strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2);
1425
1426 len = strlen(pnp_string);
1427 pnp_string[0] = (len >> 8) & 0xFF;
1428 pnp_string[1] = len & 0xFF;
1429
1430 /* all we really need is bulk IN/OUT */
1431 usb_ep_autoconfig_reset(gadget);
1432 in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc);
1433 if (!in_ep) {
1434autoconf_fail:
1435 dev_err(&gadget->dev, "can't autoconfigure on %s\n",
1436 gadget->name);
1437 return -ENODEV;
1438 }
1439 in_ep->driver_data = in_ep; /* claim */
1440
1441 out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc);
1442 if (!out_ep)
1443 goto autoconf_fail;
1444 out_ep->driver_data = out_ep; /* claim */
1445
1446#ifdef CONFIG_USB_GADGET_DUALSPEED
1447 /* assumes ep0 uses the same value for both speeds ... */
1448 dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
1449
1450 /* and that all endpoints are dual-speed */
1451 hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
1452 hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
1453#endif /* DUALSPEED */
1454
1455 device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1456 usb_gadget_set_selfpowered(gadget);
1457
1458 if (gadget->is_otg) {
1459 otg_desc.bmAttributes |= USB_OTG_HNP,
1460 config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
Craig W. Nadler25a010c2007-11-11 15:00:15 -08001461 }
1462
1463 spin_lock_init(&dev->lock);
1464 spin_lock_init(&dev->lock_printer_io);
1465 INIT_LIST_HEAD(&dev->tx_reqs);
1466 INIT_LIST_HEAD(&dev->tx_reqs_active);
1467 INIT_LIST_HEAD(&dev->rx_reqs);
1468 INIT_LIST_HEAD(&dev->rx_reqs_active);
1469 INIT_LIST_HEAD(&dev->rx_buffers);
1470 init_waitqueue_head(&dev->rx_wait);
1471 init_waitqueue_head(&dev->tx_wait);
1472 init_waitqueue_head(&dev->tx_flush_wait);
1473
1474 dev->config = 0;
1475 dev->interface = -1;
1476 dev->printer_cdev_open = 0;
1477 dev->printer_status = PRINTER_NOT_ERROR;
1478 dev->current_rx_req = NULL;
1479 dev->current_rx_bytes = 0;
1480 dev->current_rx_buf = NULL;
1481
1482 dev->in_ep = in_ep;
1483 dev->out_ep = out_ep;
1484
1485 /* preallocate control message data and buffer */
1486 dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE,
1487 GFP_KERNEL);
1488 if (!dev->req) {
1489 status = -ENOMEM;
1490 goto fail;
1491 }
1492
1493 for (i = 0; i < QLEN; i++) {
1494 req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
1495 if (!req) {
1496 while (!list_empty(&dev->tx_reqs)) {
1497 req = container_of(dev->tx_reqs.next,
1498 struct usb_request, list);
1499 list_del(&req->list);
1500 printer_req_free(dev->in_ep, req);
1501 }
1502 return -ENOMEM;
1503 }
1504 list_add(&req->list, &dev->tx_reqs);
1505 }
1506
1507 for (i = 0; i < QLEN; i++) {
1508 req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
1509 if (!req) {
1510 while (!list_empty(&dev->rx_reqs)) {
1511 req = container_of(dev->rx_reqs.next,
1512 struct usb_request, list);
1513 list_del(&req->list);
1514 printer_req_free(dev->out_ep, req);
1515 }
1516 return -ENOMEM;
1517 }
1518 list_add(&req->list, &dev->rx_reqs);
1519 }
1520
1521 dev->req->complete = printer_setup_complete;
1522
1523 /* finish hookup to lower layer ... */
1524 dev->gadget = gadget;
1525 set_gadget_data(gadget, dev);
1526 gadget->ep0->driver_data = dev;
1527
1528 INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
1529 INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name,
1530 in_ep->name);
1531
1532 return 0;
1533
1534fail:
1535 printer_unbind(gadget);
1536 return status;
1537}
1538
1539/*-------------------------------------------------------------------------*/
1540
1541static struct usb_gadget_driver printer_driver = {
1542 .speed = DEVSPEED,
1543
1544 .function = (char *) driver_desc,
1545 .bind = printer_bind,
1546 .unbind = printer_unbind,
1547
1548 .setup = printer_setup,
1549 .disconnect = printer_disconnect,
1550
1551 .driver = {
1552 .name = (char *) shortname,
1553 .owner = THIS_MODULE,
1554 },
1555};
1556
1557MODULE_DESCRIPTION(DRIVER_DESC);
1558MODULE_AUTHOR("Craig Nadler");
1559MODULE_LICENSE("GPL");
1560
1561static int __init
1562init(void)
1563{
1564 int status;
1565
1566 usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
1567 if (IS_ERR(usb_gadget_class)) {
1568 status = PTR_ERR(usb_gadget_class);
1569 ERROR(dev, "unable to create usb_gadget class %d\n", status);
1570 return status;
1571 }
1572
1573 status = alloc_chrdev_region(&g_printer_devno, 0, 1,
1574 "USB printer gadget");
1575 if (status) {
1576 ERROR(dev, "alloc_chrdev_region %d\n", status);
1577 class_destroy(usb_gadget_class);
1578 return status;
1579 }
1580
1581 status = usb_gadget_register_driver(&printer_driver);
1582 if (status) {
1583 class_destroy(usb_gadget_class);
1584 unregister_chrdev_region(g_printer_devno, 1);
1585 DBG(dev, "usb_gadget_register_driver %x\n", status);
1586 }
1587
1588 return status;
1589}
1590module_init(init);
1591
1592static void __exit
1593cleanup(void)
1594{
1595 int status;
1596
1597 spin_lock(&usb_printer_gadget.lock_printer_io);
1598 class_destroy(usb_gadget_class);
1599 unregister_chrdev_region(g_printer_devno, 2);
1600
1601 status = usb_gadget_unregister_driver(&printer_driver);
1602 if (status)
1603 ERROR(dev, "usb_gadget_unregister_driver %x\n", status);
1604
1605 spin_unlock(&usb_printer_gadget.lock_printer_io);
1606}
1607module_exit(cleanup);