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