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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 cdev printer_cdev; | |
96 | struct device *pdev; | |
97 | u8 printer_cdev_open; | |
98 | wait_queue_head_t wait; | |
99 | }; | |
100 | ||
101 | static struct printer_dev usb_printer_gadget; | |
102 | ||
103 | /*-------------------------------------------------------------------------*/ | |
104 | ||
105 | /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! | |
106 | * Instead: allocate your own, using normal USB-IF procedures. | |
107 | */ | |
108 | ||
109 | /* Thanks to NetChip Technologies for donating this product ID. | |
110 | */ | |
111 | #define PRINTER_VENDOR_NUM 0x0525 /* NetChip */ | |
112 | #define PRINTER_PRODUCT_NUM 0xa4a8 /* Linux-USB Printer Gadget */ | |
113 | ||
114 | /* Some systems will want different product identifers published in the | |
115 | * device descriptor, either numbers or strings or both. These string | |
116 | * parameters are in UTF-8 (superset of ASCII's 7 bit characters). | |
117 | */ | |
118 | ||
119 | static ushort __initdata idVendor; | |
120 | module_param(idVendor, ushort, S_IRUGO); | |
121 | MODULE_PARM_DESC(idVendor, "USB Vendor ID"); | |
122 | ||
123 | static ushort __initdata idProduct; | |
124 | module_param(idProduct, ushort, S_IRUGO); | |
125 | MODULE_PARM_DESC(idProduct, "USB Product ID"); | |
126 | ||
127 | static ushort __initdata bcdDevice; | |
128 | module_param(bcdDevice, ushort, S_IRUGO); | |
129 | MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)"); | |
130 | ||
131 | static char *__initdata iManufacturer; | |
132 | module_param(iManufacturer, charp, S_IRUGO); | |
133 | MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); | |
134 | ||
135 | static char *__initdata iProduct; | |
136 | module_param(iProduct, charp, S_IRUGO); | |
137 | MODULE_PARM_DESC(iProduct, "USB Product string"); | |
138 | ||
139 | static char *__initdata iSerialNum; | |
140 | module_param(iSerialNum, charp, S_IRUGO); | |
141 | MODULE_PARM_DESC(iSerialNum, "1"); | |
142 | ||
143 | static char *__initdata iPNPstring; | |
144 | module_param(iPNPstring, charp, S_IRUGO); | |
145 | MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;"); | |
146 | ||
147 | /* Number of requests to allocate per endpoint, not used for ep0. */ | |
148 | static unsigned qlen = 10; | |
149 | module_param(qlen, uint, S_IRUGO|S_IWUSR); | |
150 | ||
151 | #define QLEN qlen | |
152 | ||
153 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
154 | #define DEVSPEED USB_SPEED_HIGH | |
155 | #else /* full speed (low speed doesn't do bulk) */ | |
156 | #define DEVSPEED USB_SPEED_FULL | |
157 | #endif | |
158 | ||
159 | /*-------------------------------------------------------------------------*/ | |
160 | ||
161 | #define xprintk(d, level, fmt, args...) \ | |
162 | printk(level "%s: " fmt, DRIVER_DESC, ## args) | |
163 | ||
164 | #ifdef DEBUG | |
165 | #define DBG(dev, fmt, args...) \ | |
166 | xprintk(dev, KERN_DEBUG, fmt, ## args) | |
167 | #else | |
168 | #define DBG(dev, fmt, args...) \ | |
169 | do { } while (0) | |
170 | #endif /* DEBUG */ | |
171 | ||
172 | #ifdef VERBOSE | |
173 | #define VDBG(dev, fmt, args...) \ | |
174 | xprintk(dev, KERN_DEBUG, fmt, ## args) | |
175 | #else | |
176 | #define VDBG(dev, fmt, args...) \ | |
177 | do { } while (0) | |
178 | #endif /* VERBOSE */ | |
179 | ||
180 | #define ERROR(dev, fmt, args...) \ | |
181 | xprintk(dev, KERN_ERR, fmt, ## args) | |
182 | #define WARN(dev, fmt, args...) \ | |
183 | xprintk(dev, KERN_WARNING, fmt, ## args) | |
184 | #define INFO(dev, fmt, args...) \ | |
185 | xprintk(dev, KERN_INFO, fmt, ## args) | |
186 | ||
187 | /*-------------------------------------------------------------------------*/ | |
188 | ||
189 | /* USB DRIVER HOOKUP (to the hardware driver, below us), mostly | |
190 | * ep0 implementation: descriptors, config management, setup(). | |
191 | * also optional class-specific notification interrupt transfer. | |
192 | */ | |
193 | ||
194 | /* | |
195 | * DESCRIPTORS ... most are static, but strings and (full) configuration | |
196 | * descriptors are built on demand. | |
197 | */ | |
198 | ||
199 | #define STRING_MANUFACTURER 1 | |
200 | #define STRING_PRODUCT 2 | |
201 | #define STRING_SERIALNUM 3 | |
202 | ||
203 | /* holds our biggest descriptor */ | |
204 | #define USB_DESC_BUFSIZE 256 | |
205 | #define USB_BUFSIZE 8192 | |
206 | ||
207 | /* This device advertises one configuration. */ | |
208 | #define DEV_CONFIG_VALUE 1 | |
209 | #define PRINTER_INTERFACE 0 | |
210 | ||
211 | static struct usb_device_descriptor device_desc = { | |
212 | .bLength = sizeof device_desc, | |
213 | .bDescriptorType = USB_DT_DEVICE, | |
214 | .bcdUSB = __constant_cpu_to_le16(0x0200), | |
215 | .bDeviceClass = USB_CLASS_PER_INTERFACE, | |
216 | .bDeviceSubClass = 0, | |
217 | .bDeviceProtocol = 0, | |
218 | .idVendor = __constant_cpu_to_le16(PRINTER_VENDOR_NUM), | |
219 | .idProduct = __constant_cpu_to_le16(PRINTER_PRODUCT_NUM), | |
220 | .iManufacturer = STRING_MANUFACTURER, | |
221 | .iProduct = STRING_PRODUCT, | |
222 | .iSerialNumber = STRING_SERIALNUM, | |
223 | .bNumConfigurations = 1 | |
224 | }; | |
225 | ||
226 | static struct usb_otg_descriptor otg_desc = { | |
227 | .bLength = sizeof otg_desc, | |
228 | .bDescriptorType = USB_DT_OTG, | |
229 | .bmAttributes = USB_OTG_SRP | |
230 | }; | |
231 | ||
232 | static struct usb_config_descriptor config_desc = { | |
233 | .bLength = sizeof config_desc, | |
234 | .bDescriptorType = USB_DT_CONFIG, | |
235 | ||
236 | /* compute wTotalLength on the fly */ | |
237 | .bNumInterfaces = 1, | |
238 | .bConfigurationValue = DEV_CONFIG_VALUE, | |
239 | .iConfiguration = 0, | |
240 | .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER, | |
241 | .bMaxPower = 1 /* Self-Powered */ | |
242 | }; | |
243 | ||
244 | static struct usb_interface_descriptor intf_desc = { | |
245 | .bLength = sizeof intf_desc, | |
246 | .bDescriptorType = USB_DT_INTERFACE, | |
247 | .bInterfaceNumber = PRINTER_INTERFACE, | |
248 | .bNumEndpoints = 2, | |
249 | .bInterfaceClass = USB_CLASS_PRINTER, | |
250 | .bInterfaceSubClass = 1, /* Printer Sub-Class */ | |
251 | .bInterfaceProtocol = 2, /* Bi-Directional */ | |
252 | .iInterface = 0 | |
253 | }; | |
254 | ||
255 | static struct usb_endpoint_descriptor fs_ep_in_desc = { | |
256 | .bLength = USB_DT_ENDPOINT_SIZE, | |
257 | .bDescriptorType = USB_DT_ENDPOINT, | |
258 | .bEndpointAddress = USB_DIR_IN, | |
259 | .bmAttributes = USB_ENDPOINT_XFER_BULK | |
260 | }; | |
261 | ||
262 | static struct usb_endpoint_descriptor fs_ep_out_desc = { | |
263 | .bLength = USB_DT_ENDPOINT_SIZE, | |
264 | .bDescriptorType = USB_DT_ENDPOINT, | |
265 | .bEndpointAddress = USB_DIR_OUT, | |
266 | .bmAttributes = USB_ENDPOINT_XFER_BULK | |
267 | }; | |
268 | ||
269 | static const struct usb_descriptor_header *fs_printer_function [11] = { | |
270 | (struct usb_descriptor_header *) &otg_desc, | |
271 | (struct usb_descriptor_header *) &intf_desc, | |
272 | (struct usb_descriptor_header *) &fs_ep_in_desc, | |
273 | (struct usb_descriptor_header *) &fs_ep_out_desc, | |
274 | NULL | |
275 | }; | |
276 | ||
277 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
278 | ||
279 | /* | |
280 | * usb 2.0 devices need to expose both high speed and full speed | |
281 | * descriptors, unless they only run at full speed. | |
282 | */ | |
283 | ||
284 | static struct usb_endpoint_descriptor hs_ep_in_desc = { | |
285 | .bLength = USB_DT_ENDPOINT_SIZE, | |
286 | .bDescriptorType = USB_DT_ENDPOINT, | |
287 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
288 | .wMaxPacketSize = __constant_cpu_to_le16(512) | |
289 | }; | |
290 | ||
291 | static struct usb_endpoint_descriptor hs_ep_out_desc = { | |
292 | .bLength = USB_DT_ENDPOINT_SIZE, | |
293 | .bDescriptorType = USB_DT_ENDPOINT, | |
294 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
295 | .wMaxPacketSize = __constant_cpu_to_le16(512) | |
296 | }; | |
297 | ||
298 | static struct usb_qualifier_descriptor dev_qualifier = { | |
299 | .bLength = sizeof dev_qualifier, | |
300 | .bDescriptorType = USB_DT_DEVICE_QUALIFIER, | |
301 | .bcdUSB = __constant_cpu_to_le16(0x0200), | |
302 | .bDeviceClass = USB_CLASS_PRINTER, | |
303 | .bNumConfigurations = 1 | |
304 | }; | |
305 | ||
306 | static const struct usb_descriptor_header *hs_printer_function [11] = { | |
307 | (struct usb_descriptor_header *) &otg_desc, | |
308 | (struct usb_descriptor_header *) &intf_desc, | |
309 | (struct usb_descriptor_header *) &hs_ep_in_desc, | |
310 | (struct usb_descriptor_header *) &hs_ep_out_desc, | |
311 | NULL | |
312 | }; | |
313 | ||
314 | /* maxpacket and other transfer characteristics vary by speed. */ | |
315 | #define ep_desc(g, hs, fs) (((g)->speed == USB_SPEED_HIGH)?(hs):(fs)) | |
316 | ||
317 | #else | |
318 | ||
319 | /* if there's no high speed support, maxpacket doesn't change. */ | |
320 | #define ep_desc(g, hs, fs) (((void)(g)), (fs)) | |
321 | ||
322 | #endif /* !CONFIG_USB_GADGET_DUALSPEED */ | |
323 | ||
324 | /*-------------------------------------------------------------------------*/ | |
325 | ||
326 | /* descriptors that are built on-demand */ | |
327 | ||
328 | static char manufacturer [50]; | |
329 | static char product_desc [40] = DRIVER_DESC; | |
330 | static char serial_num [40] = "1"; | |
331 | static char pnp_string [1024] = | |
332 | "XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;"; | |
333 | ||
334 | /* static strings, in UTF-8 */ | |
335 | static struct usb_string strings [] = { | |
336 | { STRING_MANUFACTURER, manufacturer, }, | |
337 | { STRING_PRODUCT, product_desc, }, | |
338 | { STRING_SERIALNUM, serial_num, }, | |
339 | { } /* end of list */ | |
340 | }; | |
341 | ||
342 | static struct usb_gadget_strings stringtab = { | |
343 | .language = 0x0409, /* en-us */ | |
344 | .strings = strings, | |
345 | }; | |
346 | ||
347 | /*-------------------------------------------------------------------------*/ | |
348 | ||
349 | static struct usb_request * | |
350 | printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags) | |
351 | { | |
352 | struct usb_request *req; | |
353 | ||
354 | req = usb_ep_alloc_request(ep, gfp_flags); | |
355 | ||
356 | if (req != NULL) { | |
357 | req->length = len; | |
358 | req->buf = kmalloc(len, gfp_flags); | |
359 | if (req->buf == NULL) { | |
360 | usb_ep_free_request(ep, req); | |
361 | return NULL; | |
362 | } | |
363 | } | |
364 | ||
365 | return req; | |
366 | } | |
367 | ||
368 | static void | |
369 | printer_req_free(struct usb_ep *ep, struct usb_request *req) | |
370 | { | |
371 | if (ep != NULL && req != NULL) { | |
372 | kfree(req->buf); | |
373 | usb_ep_free_request(ep, req); | |
374 | } | |
375 | } | |
376 | ||
377 | /*-------------------------------------------------------------------------*/ | |
378 | ||
379 | static void rx_complete(struct usb_ep *ep, struct usb_request *req) | |
380 | { | |
381 | struct printer_dev *dev = ep->driver_data; | |
382 | int status = req->status; | |
383 | unsigned long flags; | |
384 | ||
385 | spin_lock_irqsave(&dev->lock, flags); | |
386 | ||
387 | list_del_init(&req->list); /* Remode from Active List */ | |
388 | ||
389 | switch (status) { | |
390 | ||
391 | /* normal completion */ | |
392 | case 0: | |
393 | if (req->actual > 0) { | |
394 | list_add_tail(&req->list, &dev->rx_buffers); | |
395 | DBG(dev, "G_Printer : rx length %d\n", req->actual); | |
396 | } else { | |
397 | list_add(&req->list, &dev->rx_reqs); | |
398 | } | |
399 | break; | |
400 | ||
401 | /* software-driven interface shutdown */ | |
402 | case -ECONNRESET: /* unlink */ | |
403 | case -ESHUTDOWN: /* disconnect etc */ | |
404 | VDBG(dev, "rx shutdown, code %d\n", status); | |
405 | list_add(&req->list, &dev->rx_reqs); | |
406 | break; | |
407 | ||
408 | /* for hardware automagic (such as pxa) */ | |
409 | case -ECONNABORTED: /* endpoint reset */ | |
410 | DBG(dev, "rx %s reset\n", ep->name); | |
411 | list_add(&req->list, &dev->rx_reqs); | |
412 | break; | |
413 | ||
414 | /* data overrun */ | |
415 | case -EOVERFLOW: | |
416 | /* FALLTHROUGH */ | |
417 | ||
418 | default: | |
419 | DBG(dev, "rx status %d\n", status); | |
420 | list_add(&req->list, &dev->rx_reqs); | |
421 | break; | |
422 | } | |
423 | ||
424 | wake_up_interruptible(&dev->rx_wait); | |
425 | spin_unlock_irqrestore(&dev->lock, flags); | |
426 | } | |
427 | ||
428 | static void tx_complete(struct usb_ep *ep, struct usb_request *req) | |
429 | { | |
430 | struct printer_dev *dev = ep->driver_data; | |
431 | ||
432 | switch (req->status) { | |
433 | default: | |
434 | VDBG(dev, "tx err %d\n", req->status); | |
435 | /* FALLTHROUGH */ | |
436 | case -ECONNRESET: /* unlink */ | |
437 | case -ESHUTDOWN: /* disconnect etc */ | |
438 | break; | |
439 | case 0: | |
440 | break; | |
441 | } | |
442 | ||
443 | spin_lock(&dev->lock); | |
444 | /* Take the request struct off the active list and put it on the | |
445 | * free list. | |
446 | */ | |
447 | list_del_init(&req->list); | |
448 | list_add(&req->list, &dev->tx_reqs); | |
449 | wake_up_interruptible(&dev->tx_wait); | |
450 | if (likely(list_empty(&dev->tx_reqs_active))) | |
451 | wake_up_interruptible(&dev->tx_flush_wait); | |
452 | ||
453 | spin_unlock(&dev->lock); | |
454 | } | |
455 | ||
456 | /*-------------------------------------------------------------------------*/ | |
457 | ||
458 | static int | |
459 | printer_open(struct inode *inode, struct file *fd) | |
460 | { | |
461 | struct printer_dev *dev; | |
462 | unsigned long flags; | |
463 | int ret = -EBUSY; | |
464 | ||
465 | lock_kernel(); | |
466 | dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev); | |
467 | ||
468 | spin_lock_irqsave(&dev->lock, flags); | |
469 | ||
470 | if (!dev->printer_cdev_open) { | |
471 | dev->printer_cdev_open = 1; | |
472 | fd->private_data = dev; | |
473 | ret = 0; | |
474 | /* Change the printer status to show that it's on-line. */ | |
475 | dev->printer_status |= PRINTER_SELECTED; | |
476 | } | |
477 | ||
478 | spin_unlock_irqrestore(&dev->lock, flags); | |
479 | ||
480 | DBG(dev, "printer_open returned %x\n", ret); | |
481 | unlock_kernel(); | |
482 | return ret; | |
483 | } | |
484 | ||
485 | static int | |
486 | printer_close(struct inode *inode, struct file *fd) | |
487 | { | |
488 | struct printer_dev *dev = fd->private_data; | |
489 | unsigned long flags; | |
490 | ||
491 | spin_lock_irqsave(&dev->lock, flags); | |
492 | dev->printer_cdev_open = 0; | |
493 | fd->private_data = NULL; | |
494 | /* Change printer status to show that the printer is off-line. */ | |
495 | dev->printer_status &= ~PRINTER_SELECTED; | |
496 | spin_unlock_irqrestore(&dev->lock, flags); | |
497 | ||
498 | DBG(dev, "printer_close\n"); | |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
503 | /* This function must be called with interrupts turned off. */ | |
504 | static void | |
505 | setup_rx_reqs(struct printer_dev *dev) | |
506 | { | |
507 | struct usb_request *req; | |
508 | ||
509 | while (likely(!list_empty(&dev->rx_reqs))) { | |
510 | int error; | |
511 | ||
512 | req = container_of(dev->rx_reqs.next, | |
513 | struct usb_request, list); | |
514 | list_del_init(&req->list); | |
515 | ||
516 | /* The USB Host sends us whatever amount of data it wants to | |
517 | * so we always set the length field to the full USB_BUFSIZE. | |
518 | * If the amount of data is more than the read() caller asked | |
519 | * for it will be stored in the request buffer until it is | |
520 | * asked for by read(). | |
521 | */ | |
522 | req->length = USB_BUFSIZE; | |
523 | req->complete = rx_complete; | |
524 | ||
525 | error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC); | |
526 | if (error) { | |
527 | DBG(dev, "rx submit --> %d\n", error); | |
528 | list_add(&req->list, &dev->rx_reqs); | |
529 | break; | |
530 | } else { | |
531 | list_add(&req->list, &dev->rx_reqs_active); | |
532 | } | |
533 | } | |
534 | } | |
535 | ||
536 | static ssize_t | |
537 | printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr) | |
538 | { | |
539 | struct printer_dev *dev = fd->private_data; | |
540 | unsigned long flags; | |
541 | size_t size; | |
542 | size_t bytes_copied; | |
543 | struct usb_request *req; | |
544 | /* This is a pointer to the current USB rx request. */ | |
545 | struct usb_request *current_rx_req; | |
546 | /* This is the number of bytes in the current rx buffer. */ | |
547 | size_t current_rx_bytes; | |
548 | /* This is a pointer to the current rx buffer. */ | |
549 | u8 *current_rx_buf; | |
550 | ||
551 | if (len == 0) | |
552 | return -EINVAL; | |
553 | ||
554 | DBG(dev, "printer_read trying to read %d bytes\n", (int)len); | |
555 | ||
556 | spin_lock(&dev->lock_printer_io); | |
557 | spin_lock_irqsave(&dev->lock, flags); | |
558 | ||
559 | /* We will use this flag later to check if a printer reset happened | |
560 | * after we turn interrupts back on. | |
561 | */ | |
562 | dev->reset_printer = 0; | |
563 | ||
564 | setup_rx_reqs(dev); | |
565 | ||
566 | bytes_copied = 0; | |
567 | current_rx_req = dev->current_rx_req; | |
568 | current_rx_bytes = dev->current_rx_bytes; | |
569 | current_rx_buf = dev->current_rx_buf; | |
570 | dev->current_rx_req = NULL; | |
571 | dev->current_rx_bytes = 0; | |
572 | dev->current_rx_buf = NULL; | |
573 | ||
574 | /* Check if there is any data in the read buffers. Please note that | |
575 | * current_rx_bytes is the number of bytes in the current rx buffer. | |
576 | * If it is zero then check if there are any other rx_buffers that | |
577 | * are on the completed list. We are only out of data if all rx | |
578 | * buffers are empty. | |
579 | */ | |
580 | if ((current_rx_bytes == 0) && | |
581 | (likely(list_empty(&dev->rx_buffers)))) { | |
582 | /* Turn interrupts back on before sleeping. */ | |
583 | spin_unlock_irqrestore(&dev->lock, flags); | |
584 | ||
585 | /* | |
586 | * If no data is available check if this is a NON-Blocking | |
587 | * call or not. | |
588 | */ | |
589 | if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { | |
590 | spin_unlock(&dev->lock_printer_io); | |
591 | return -EAGAIN; | |
592 | } | |
593 | ||
594 | /* Sleep until data is available */ | |
595 | wait_event_interruptible(dev->rx_wait, | |
596 | (likely(!list_empty(&dev->rx_buffers)))); | |
597 | spin_lock_irqsave(&dev->lock, flags); | |
598 | } | |
599 | ||
600 | /* We have data to return then copy it to the caller's buffer.*/ | |
601 | while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers))) | |
602 | && len) { | |
603 | if (current_rx_bytes == 0) { | |
604 | req = container_of(dev->rx_buffers.next, | |
605 | struct usb_request, list); | |
606 | list_del_init(&req->list); | |
607 | ||
608 | if (req->actual && req->buf) { | |
609 | current_rx_req = req; | |
610 | current_rx_bytes = req->actual; | |
611 | current_rx_buf = req->buf; | |
612 | } else { | |
613 | list_add(&req->list, &dev->rx_reqs); | |
614 | continue; | |
615 | } | |
616 | } | |
617 | ||
618 | /* Don't leave irqs off while doing memory copies */ | |
619 | spin_unlock_irqrestore(&dev->lock, flags); | |
620 | ||
621 | if (len > current_rx_bytes) | |
622 | size = current_rx_bytes; | |
623 | else | |
624 | size = len; | |
625 | ||
626 | size -= copy_to_user(buf, current_rx_buf, size); | |
627 | bytes_copied += size; | |
628 | len -= size; | |
629 | buf += size; | |
630 | ||
631 | spin_lock_irqsave(&dev->lock, flags); | |
632 | ||
633 | /* We've disconnected or reset so return. */ | |
634 | if (dev->reset_printer) { | |
635 | list_add(¤t_rx_req->list, &dev->rx_reqs); | |
636 | spin_unlock_irqrestore(&dev->lock, flags); | |
637 | spin_unlock(&dev->lock_printer_io); | |
638 | return -EAGAIN; | |
639 | } | |
640 | ||
641 | /* If we not returning all the data left in this RX request | |
642 | * buffer then adjust the amount of data left in the buffer. | |
643 | * Othewise if we are done with this RX request buffer then | |
644 | * requeue it to get any incoming data from the USB host. | |
645 | */ | |
646 | if (size < current_rx_bytes) { | |
647 | current_rx_bytes -= size; | |
648 | current_rx_buf += size; | |
649 | } else { | |
650 | list_add(¤t_rx_req->list, &dev->rx_reqs); | |
651 | current_rx_bytes = 0; | |
652 | current_rx_buf = NULL; | |
653 | current_rx_req = NULL; | |
654 | } | |
655 | } | |
656 | ||
657 | dev->current_rx_req = current_rx_req; | |
658 | dev->current_rx_bytes = current_rx_bytes; | |
659 | dev->current_rx_buf = current_rx_buf; | |
660 | ||
661 | spin_unlock_irqrestore(&dev->lock, flags); | |
662 | spin_unlock(&dev->lock_printer_io); | |
663 | ||
664 | DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied); | |
665 | ||
666 | if (bytes_copied) | |
667 | return bytes_copied; | |
668 | else | |
669 | return -EAGAIN; | |
670 | } | |
671 | ||
672 | static ssize_t | |
673 | printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr) | |
674 | { | |
675 | struct printer_dev *dev = fd->private_data; | |
676 | unsigned long flags; | |
677 | size_t size; /* Amount of data in a TX request. */ | |
678 | size_t bytes_copied = 0; | |
679 | struct usb_request *req; | |
680 | ||
681 | DBG(dev, "printer_write trying to send %d bytes\n", (int)len); | |
682 | ||
683 | if (len == 0) | |
684 | return -EINVAL; | |
685 | ||
686 | spin_lock(&dev->lock_printer_io); | |
687 | spin_lock_irqsave(&dev->lock, flags); | |
688 | ||
689 | /* Check if a printer reset happens while we have interrupts on */ | |
690 | dev->reset_printer = 0; | |
691 | ||
692 | /* Check if there is any available write buffers */ | |
693 | if (likely(list_empty(&dev->tx_reqs))) { | |
694 | /* Turn interrupts back on before sleeping. */ | |
695 | spin_unlock_irqrestore(&dev->lock, flags); | |
696 | ||
697 | /* | |
698 | * If write buffers are available check if this is | |
699 | * a NON-Blocking call or not. | |
700 | */ | |
701 | if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { | |
702 | spin_unlock(&dev->lock_printer_io); | |
703 | return -EAGAIN; | |
704 | } | |
705 | ||
706 | /* Sleep until a write buffer is available */ | |
707 | wait_event_interruptible(dev->tx_wait, | |
708 | (likely(!list_empty(&dev->tx_reqs)))); | |
709 | spin_lock_irqsave(&dev->lock, flags); | |
710 | } | |
711 | ||
712 | while (likely(!list_empty(&dev->tx_reqs)) && len) { | |
713 | ||
714 | if (len > USB_BUFSIZE) | |
715 | size = USB_BUFSIZE; | |
716 | else | |
717 | size = len; | |
718 | ||
719 | req = container_of(dev->tx_reqs.next, struct usb_request, | |
720 | list); | |
721 | list_del_init(&req->list); | |
722 | ||
723 | req->complete = tx_complete; | |
724 | req->length = size; | |
725 | ||
726 | /* Check if we need to send a zero length packet. */ | |
727 | if (len > size) | |
728 | /* They will be more TX requests so no yet. */ | |
729 | req->zero = 0; | |
730 | else | |
731 | /* If the data amount is not a multple of the | |
732 | * maxpacket size then send a zero length packet. | |
733 | */ | |
734 | req->zero = ((len % dev->in_ep->maxpacket) == 0); | |
735 | ||
736 | /* Don't leave irqs off while doing memory copies */ | |
737 | spin_unlock_irqrestore(&dev->lock, flags); | |
738 | ||
739 | if (copy_from_user(req->buf, buf, size)) { | |
740 | list_add(&req->list, &dev->tx_reqs); | |
741 | spin_unlock(&dev->lock_printer_io); | |
742 | return bytes_copied; | |
743 | } | |
744 | ||
745 | bytes_copied += size; | |
746 | len -= size; | |
747 | buf += size; | |
748 | ||
749 | spin_lock_irqsave(&dev->lock, flags); | |
750 | ||
751 | /* We've disconnected or reset so free the req and buffer */ | |
752 | if (dev->reset_printer) { | |
753 | list_add(&req->list, &dev->tx_reqs); | |
754 | spin_unlock_irqrestore(&dev->lock, flags); | |
755 | spin_unlock(&dev->lock_printer_io); | |
756 | return -EAGAIN; | |
757 | } | |
758 | ||
759 | if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) { | |
760 | list_add(&req->list, &dev->tx_reqs); | |
761 | spin_unlock_irqrestore(&dev->lock, flags); | |
762 | spin_unlock(&dev->lock_printer_io); | |
763 | return -EAGAIN; | |
764 | } | |
765 | ||
766 | list_add(&req->list, &dev->tx_reqs_active); | |
767 | ||
768 | } | |
769 | ||
770 | spin_unlock_irqrestore(&dev->lock, flags); | |
771 | spin_unlock(&dev->lock_printer_io); | |
772 | ||
773 | DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied); | |
774 | ||
775 | if (bytes_copied) { | |
776 | return bytes_copied; | |
777 | } else { | |
778 | return -EAGAIN; | |
779 | } | |
780 | } | |
781 | ||
782 | static int | |
783 | printer_fsync(struct file *fd, struct dentry *dentry, int datasync) | |
784 | { | |
785 | struct printer_dev *dev = fd->private_data; | |
786 | unsigned long flags; | |
787 | int tx_list_empty; | |
788 | ||
789 | spin_lock_irqsave(&dev->lock, flags); | |
790 | tx_list_empty = (likely(list_empty(&dev->tx_reqs))); | |
791 | spin_unlock_irqrestore(&dev->lock, flags); | |
792 | ||
793 | if (!tx_list_empty) { | |
794 | /* Sleep until all data has been sent */ | |
795 | wait_event_interruptible(dev->tx_flush_wait, | |
796 | (likely(list_empty(&dev->tx_reqs_active)))); | |
797 | } | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | static unsigned int | |
803 | printer_poll(struct file *fd, poll_table *wait) | |
804 | { | |
805 | struct printer_dev *dev = fd->private_data; | |
806 | unsigned long flags; | |
807 | int status = 0; | |
808 | ||
809 | spin_lock(&dev->lock_printer_io); | |
810 | spin_lock_irqsave(&dev->lock, flags); | |
811 | setup_rx_reqs(dev); | |
812 | spin_unlock_irqrestore(&dev->lock, flags); | |
813 | spin_unlock(&dev->lock_printer_io); | |
814 | ||
815 | poll_wait(fd, &dev->rx_wait, wait); | |
816 | poll_wait(fd, &dev->tx_wait, wait); | |
817 | ||
818 | spin_lock_irqsave(&dev->lock, flags); | |
819 | if (likely(!list_empty(&dev->tx_reqs))) | |
820 | status |= POLLOUT | POLLWRNORM; | |
821 | ||
822 | if (likely(dev->current_rx_bytes) || | |
823 | likely(!list_empty(&dev->rx_buffers))) | |
824 | status |= POLLIN | POLLRDNORM; | |
825 | ||
826 | spin_unlock_irqrestore(&dev->lock, flags); | |
827 | ||
828 | return status; | |
829 | } | |
830 | ||
831 | static int | |
832 | printer_ioctl(struct inode *inode, struct file *fd, unsigned int code, | |
833 | unsigned long arg) | |
834 | { | |
835 | struct printer_dev *dev = fd->private_data; | |
836 | unsigned long flags; | |
837 | int status = 0; | |
838 | ||
839 | DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg); | |
840 | ||
841 | /* handle ioctls */ | |
842 | ||
843 | spin_lock_irqsave(&dev->lock, flags); | |
844 | ||
845 | switch (code) { | |
846 | case GADGET_GET_PRINTER_STATUS: | |
847 | status = (int)dev->printer_status; | |
848 | break; | |
849 | case GADGET_SET_PRINTER_STATUS: | |
850 | dev->printer_status = (u8)arg; | |
851 | break; | |
852 | default: | |
853 | /* could not handle ioctl */ | |
854 | DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n", | |
855 | code); | |
856 | status = -ENOTTY; | |
857 | } | |
858 | ||
859 | spin_unlock_irqrestore(&dev->lock, flags); | |
860 | ||
861 | return status; | |
862 | } | |
863 | ||
864 | /* used after endpoint configuration */ | |
865 | static struct file_operations printer_io_operations = { | |
866 | .owner = THIS_MODULE, | |
867 | .open = printer_open, | |
868 | .read = printer_read, | |
869 | .write = printer_write, | |
870 | .fsync = printer_fsync, | |
871 | .poll = printer_poll, | |
872 | .ioctl = printer_ioctl, | |
873 | .release = printer_close | |
874 | }; | |
875 | ||
876 | /*-------------------------------------------------------------------------*/ | |
877 | ||
878 | static int | |
879 | set_printer_interface(struct printer_dev *dev) | |
880 | { | |
881 | int result = 0; | |
882 | ||
883 | dev->in = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc); | |
884 | dev->in_ep->driver_data = dev; | |
885 | ||
886 | dev->out = ep_desc(dev->gadget, &hs_ep_out_desc, &fs_ep_out_desc); | |
887 | dev->out_ep->driver_data = dev; | |
888 | ||
889 | result = usb_ep_enable(dev->in_ep, dev->in); | |
890 | if (result != 0) { | |
891 | DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result); | |
892 | goto done; | |
893 | } | |
894 | ||
895 | result = usb_ep_enable(dev->out_ep, dev->out); | |
896 | if (result != 0) { | |
897 | DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result); | |
898 | goto done; | |
899 | } | |
900 | ||
901 | done: | |
902 | /* on error, disable any endpoints */ | |
903 | if (result != 0) { | |
904 | (void) usb_ep_disable(dev->in_ep); | |
905 | (void) usb_ep_disable(dev->out_ep); | |
906 | dev->in = NULL; | |
907 | dev->out = NULL; | |
908 | } | |
909 | ||
910 | /* caller is responsible for cleanup on error */ | |
911 | return result; | |
912 | } | |
913 | ||
914 | static void printer_reset_interface(struct printer_dev *dev) | |
915 | { | |
916 | if (dev->interface < 0) | |
917 | return; | |
918 | ||
919 | DBG(dev, "%s\n", __func__); | |
920 | ||
921 | if (dev->in) | |
922 | usb_ep_disable(dev->in_ep); | |
923 | ||
924 | if (dev->out) | |
925 | usb_ep_disable(dev->out_ep); | |
926 | ||
927 | dev->interface = -1; | |
928 | } | |
929 | ||
930 | /* change our operational config. must agree with the code | |
931 | * that returns config descriptors, and altsetting code. | |
932 | */ | |
933 | static int | |
934 | printer_set_config(struct printer_dev *dev, unsigned number) | |
935 | { | |
936 | int result = 0; | |
937 | struct usb_gadget *gadget = dev->gadget; | |
938 | ||
939 | if (gadget_is_sa1100(gadget) && dev->config) { | |
940 | /* tx fifo is full, but we can't clear it...*/ | |
941 | INFO(dev, "can't change configurations\n"); | |
942 | return -ESPIPE; | |
943 | } | |
944 | ||
945 | switch (number) { | |
946 | case DEV_CONFIG_VALUE: | |
947 | result = 0; | |
948 | break; | |
949 | default: | |
950 | result = -EINVAL; | |
951 | /* FALL THROUGH */ | |
952 | case 0: | |
953 | break; | |
954 | } | |
955 | ||
956 | if (result) { | |
957 | usb_gadget_vbus_draw(dev->gadget, | |
958 | dev->gadget->is_otg ? 8 : 100); | |
959 | } else { | |
960 | char *speed; | |
961 | unsigned power; | |
962 | ||
963 | power = 2 * config_desc.bMaxPower; | |
964 | usb_gadget_vbus_draw(dev->gadget, power); | |
965 | ||
966 | switch (gadget->speed) { | |
967 | case USB_SPEED_FULL: speed = "full"; break; | |
968 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
969 | case USB_SPEED_HIGH: speed = "high"; break; | |
970 | #endif | |
971 | default: speed = "?"; break; | |
972 | } | |
973 | ||
974 | dev->config = number; | |
975 | INFO(dev, "%s speed config #%d: %d mA, %s\n", | |
976 | speed, number, power, driver_desc); | |
977 | } | |
978 | return result; | |
979 | } | |
980 | ||
981 | static int | |
982 | config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index, | |
983 | int is_otg) | |
984 | { | |
985 | int len; | |
986 | const struct usb_descriptor_header **function; | |
987 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
988 | int hs = (speed == USB_SPEED_HIGH); | |
989 | ||
990 | if (type == USB_DT_OTHER_SPEED_CONFIG) | |
991 | hs = !hs; | |
992 | ||
993 | if (hs) { | |
994 | function = hs_printer_function; | |
995 | } else { | |
996 | function = fs_printer_function; | |
997 | } | |
998 | #else | |
999 | function = fs_printer_function; | |
1000 | #endif | |
1001 | ||
1002 | if (index >= device_desc.bNumConfigurations) | |
1003 | return -EINVAL; | |
1004 | ||
1005 | /* for now, don't advertise srp-only devices */ | |
1006 | if (!is_otg) | |
1007 | function++; | |
1008 | ||
1009 | len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE, | |
1010 | function); | |
1011 | if (len < 0) | |
1012 | return len; | |
1013 | ((struct usb_config_descriptor *) buf)->bDescriptorType = type; | |
1014 | return len; | |
1015 | } | |
1016 | ||
1017 | /* Change our operational Interface. */ | |
1018 | static int | |
1019 | set_interface(struct printer_dev *dev, unsigned number) | |
1020 | { | |
1021 | int result = 0; | |
1022 | ||
1023 | if (gadget_is_sa1100(dev->gadget) && dev->interface < 0) { | |
1024 | /* tx fifo is full, but we can't clear it...*/ | |
1025 | INFO(dev, "can't change interfaces\n"); | |
1026 | return -ESPIPE; | |
1027 | } | |
1028 | ||
1029 | /* Free the current interface */ | |
1030 | switch (dev->interface) { | |
1031 | case PRINTER_INTERFACE: | |
1032 | printer_reset_interface(dev); | |
1033 | break; | |
1034 | } | |
1035 | ||
1036 | switch (number) { | |
1037 | case PRINTER_INTERFACE: | |
1038 | result = set_printer_interface(dev); | |
1039 | if (result) { | |
1040 | printer_reset_interface(dev); | |
1041 | } else { | |
1042 | dev->interface = PRINTER_INTERFACE; | |
1043 | } | |
1044 | break; | |
1045 | default: | |
1046 | result = -EINVAL; | |
1047 | /* FALL THROUGH */ | |
1048 | } | |
1049 | ||
1050 | if (!result) | |
1051 | INFO(dev, "Using interface %x\n", number); | |
1052 | ||
1053 | return result; | |
1054 | } | |
1055 | ||
1056 | static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req) | |
1057 | { | |
1058 | if (req->status || req->actual != req->length) | |
1059 | DBG((struct printer_dev *) ep->driver_data, | |
1060 | "setup complete --> %d, %d/%d\n", | |
1061 | req->status, req->actual, req->length); | |
1062 | } | |
1063 | ||
1064 | static void printer_soft_reset(struct printer_dev *dev) | |
1065 | { | |
1066 | struct usb_request *req; | |
1067 | ||
1068 | INFO(dev, "Received Printer Reset Request\n"); | |
1069 | ||
1070 | if (usb_ep_disable(dev->in_ep)) | |
1071 | DBG(dev, "Failed to disable USB in_ep\n"); | |
1072 | if (usb_ep_disable(dev->out_ep)) | |
1073 | DBG(dev, "Failed to disable USB out_ep\n"); | |
1074 | ||
1075 | if (dev->current_rx_req != NULL) { | |
1076 | list_add(&dev->current_rx_req->list, &dev->rx_reqs); | |
1077 | dev->current_rx_req = NULL; | |
1078 | } | |
1079 | dev->current_rx_bytes = 0; | |
1080 | dev->current_rx_buf = NULL; | |
1081 | dev->reset_printer = 1; | |
1082 | ||
1083 | while (likely(!(list_empty(&dev->rx_buffers)))) { | |
1084 | req = container_of(dev->rx_buffers.next, struct usb_request, | |
1085 | list); | |
1086 | list_del_init(&req->list); | |
1087 | list_add(&req->list, &dev->rx_reqs); | |
1088 | } | |
1089 | ||
1090 | while (likely(!(list_empty(&dev->rx_reqs_active)))) { | |
1091 | req = container_of(dev->rx_buffers.next, struct usb_request, | |
1092 | list); | |
1093 | list_del_init(&req->list); | |
1094 | list_add(&req->list, &dev->rx_reqs); | |
1095 | } | |
1096 | ||
1097 | while (likely(!(list_empty(&dev->tx_reqs_active)))) { | |
1098 | req = container_of(dev->tx_reqs_active.next, | |
1099 | struct usb_request, list); | |
1100 | list_del_init(&req->list); | |
1101 | list_add(&req->list, &dev->tx_reqs); | |
1102 | } | |
1103 | ||
1104 | if (usb_ep_enable(dev->in_ep, dev->in)) | |
1105 | DBG(dev, "Failed to enable USB in_ep\n"); | |
1106 | if (usb_ep_enable(dev->out_ep, dev->out)) | |
1107 | DBG(dev, "Failed to enable USB out_ep\n"); | |
1108 | ||
1109 | wake_up_interruptible(&dev->rx_wait); | |
1110 | wake_up_interruptible(&dev->tx_wait); | |
1111 | wake_up_interruptible(&dev->tx_flush_wait); | |
1112 | } | |
1113 | ||
1114 | /*-------------------------------------------------------------------------*/ | |
1115 | ||
1116 | /* | |
1117 | * The setup() callback implements all the ep0 functionality that's not | |
1118 | * handled lower down. | |
1119 | */ | |
1120 | static int | |
1121 | printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) | |
1122 | { | |
1123 | struct printer_dev *dev = get_gadget_data(gadget); | |
1124 | struct usb_request *req = dev->req; | |
1125 | int value = -EOPNOTSUPP; | |
1126 | u16 wIndex = le16_to_cpu(ctrl->wIndex); | |
1127 | u16 wValue = le16_to_cpu(ctrl->wValue); | |
1128 | u16 wLength = le16_to_cpu(ctrl->wLength); | |
1129 | ||
1130 | DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n", | |
1131 | ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength); | |
1132 | ||
1133 | req->complete = printer_setup_complete; | |
1134 | ||
1135 | switch (ctrl->bRequestType&USB_TYPE_MASK) { | |
1136 | ||
1137 | case USB_TYPE_STANDARD: | |
1138 | switch (ctrl->bRequest) { | |
1139 | ||
1140 | case USB_REQ_GET_DESCRIPTOR: | |
1141 | if (ctrl->bRequestType != USB_DIR_IN) | |
1142 | break; | |
1143 | switch (wValue >> 8) { | |
1144 | ||
1145 | case USB_DT_DEVICE: | |
1146 | value = min(wLength, (u16) sizeof device_desc); | |
1147 | memcpy(req->buf, &device_desc, value); | |
1148 | break; | |
1149 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
1150 | case USB_DT_DEVICE_QUALIFIER: | |
1151 | if (!gadget->is_dualspeed) | |
1152 | break; | |
1153 | value = min(wLength, | |
1154 | (u16) sizeof dev_qualifier); | |
1155 | memcpy(req->buf, &dev_qualifier, value); | |
1156 | break; | |
1157 | ||
1158 | case USB_DT_OTHER_SPEED_CONFIG: | |
1159 | if (!gadget->is_dualspeed) | |
1160 | break; | |
1161 | /* FALLTHROUGH */ | |
1162 | #endif /* CONFIG_USB_GADGET_DUALSPEED */ | |
1163 | case USB_DT_CONFIG: | |
1164 | value = config_buf(gadget->speed, req->buf, | |
1165 | wValue >> 8, | |
1166 | wValue & 0xff, | |
1167 | gadget->is_otg); | |
1168 | if (value >= 0) | |
1169 | value = min(wLength, (u16) value); | |
1170 | break; | |
1171 | ||
1172 | case USB_DT_STRING: | |
1173 | value = usb_gadget_get_string(&stringtab, | |
1174 | wValue & 0xff, req->buf); | |
1175 | if (value >= 0) | |
1176 | value = min(wLength, (u16) value); | |
1177 | break; | |
1178 | } | |
1179 | break; | |
1180 | ||
1181 | case USB_REQ_SET_CONFIGURATION: | |
1182 | if (ctrl->bRequestType != 0) | |
1183 | break; | |
1184 | if (gadget->a_hnp_support) | |
1185 | DBG(dev, "HNP available\n"); | |
1186 | else if (gadget->a_alt_hnp_support) | |
1187 | DBG(dev, "HNP needs a different root port\n"); | |
1188 | value = printer_set_config(dev, wValue); | |
1189 | break; | |
1190 | case USB_REQ_GET_CONFIGURATION: | |
1191 | if (ctrl->bRequestType != USB_DIR_IN) | |
1192 | break; | |
1193 | *(u8 *)req->buf = dev->config; | |
1194 | value = min(wLength, (u16) 1); | |
1195 | break; | |
1196 | ||
1197 | case USB_REQ_SET_INTERFACE: | |
1198 | if (ctrl->bRequestType != USB_RECIP_INTERFACE || | |
1199 | !dev->config) | |
1200 | break; | |
1201 | ||
1202 | value = set_interface(dev, PRINTER_INTERFACE); | |
1203 | break; | |
1204 | case USB_REQ_GET_INTERFACE: | |
1205 | if (ctrl->bRequestType != | |
1206 | (USB_DIR_IN|USB_RECIP_INTERFACE) | |
1207 | || !dev->config) | |
1208 | break; | |
1209 | ||
1210 | *(u8 *)req->buf = dev->interface; | |
1211 | value = min(wLength, (u16) 1); | |
1212 | break; | |
1213 | ||
1214 | default: | |
1215 | goto unknown; | |
1216 | } | |
1217 | break; | |
1218 | ||
1219 | case USB_TYPE_CLASS: | |
1220 | switch (ctrl->bRequest) { | |
1221 | case 0: /* Get the IEEE-1284 PNP String */ | |
1222 | /* Only one printer interface is supported. */ | |
1223 | if ((wIndex>>8) != PRINTER_INTERFACE) | |
1224 | break; | |
1225 | ||
1226 | value = (pnp_string[0]<<8)|pnp_string[1]; | |
1227 | memcpy(req->buf, pnp_string, value); | |
1228 | DBG(dev, "1284 PNP String: %x %s\n", value, | |
1229 | &pnp_string[2]); | |
1230 | break; | |
1231 | ||
1232 | case 1: /* Get Port Status */ | |
1233 | /* Only one printer interface is supported. */ | |
1234 | if (wIndex != PRINTER_INTERFACE) | |
1235 | break; | |
1236 | ||
1237 | *(u8 *)req->buf = dev->printer_status; | |
1238 | value = min(wLength, (u16) 1); | |
1239 | break; | |
1240 | ||
1241 | case 2: /* Soft Reset */ | |
1242 | /* Only one printer interface is supported. */ | |
1243 | if (wIndex != PRINTER_INTERFACE) | |
1244 | break; | |
1245 | ||
1246 | printer_soft_reset(dev); | |
1247 | ||
1248 | value = 0; | |
1249 | break; | |
1250 | ||
1251 | default: | |
1252 | goto unknown; | |
1253 | } | |
1254 | break; | |
1255 | ||
1256 | default: | |
1257 | unknown: | |
1258 | VDBG(dev, | |
1259 | "unknown ctrl req%02x.%02x v%04x i%04x l%d\n", | |
1260 | ctrl->bRequestType, ctrl->bRequest, | |
1261 | wValue, wIndex, wLength); | |
1262 | break; | |
1263 | } | |
1264 | ||
1265 | /* respond with data transfer before status phase? */ | |
1266 | if (value >= 0) { | |
1267 | req->length = value; | |
1268 | req->zero = value < wLength | |
1269 | && (value % gadget->ep0->maxpacket) == 0; | |
1270 | 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 | ||
1282 | static void | |
1283 | printer_disconnect(struct usb_gadget *gadget) | |
1284 | { | |
1285 | struct printer_dev *dev = get_gadget_data(gadget); | |
1286 | unsigned long flags; | |
1287 | ||
1288 | DBG(dev, "%s\n", __func__); | |
1289 | ||
1290 | spin_lock_irqsave(&dev->lock, flags); | |
1291 | ||
1292 | printer_reset_interface(dev); | |
1293 | ||
1294 | spin_unlock_irqrestore(&dev->lock, flags); | |
1295 | } | |
1296 | ||
1297 | static void | |
1298 | printer_unbind(struct usb_gadget *gadget) | |
1299 | { | |
1300 | struct printer_dev *dev = get_gadget_data(gadget); | |
1301 | struct usb_request *req; | |
1302 | ||
1303 | ||
1304 | DBG(dev, "%s\n", __func__); | |
1305 | ||
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 | ||
1324 | if (dev->current_rx_req != NULL) | |
1325 | 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 | ||
1349 | static int __init | |
1350 | printer_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. */ | |
1364 | dev->pdev = device_create(usb_gadget_class, NULL, g_printer_devno, | |
1365 | "g_printer"); | |
1366 | 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 | ||
1383 | if (gadget_is_sa1100(gadget)) { | |
1384 | /* hardware can't write zero length packets. */ | |
1385 | ERROR(dev, "SA1100 controller is unsupport by this driver\n"); | |
1386 | goto fail; | |
1387 | } | |
1388 | ||
1389 | gcnum = usb_gadget_controller_number(gadget); | |
1390 | if (gcnum >= 0) { | |
1391 | device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum); | |
1392 | } else { | |
1393 | dev_warn(&gadget->dev, "controller '%s' not recognized\n", | |
1394 | gadget->name); | |
1395 | /* unrecognized, but safe unless bulk is REALLY quirky */ | |
1396 | device_desc.bcdDevice = | |
1397 | __constant_cpu_to_le16(0xFFFF); | |
1398 | } | |
1399 | snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s", | |
1400 | init_utsname()->sysname, init_utsname()->release, | |
1401 | gadget->name); | |
1402 | ||
1403 | device_desc.idVendor = | |
1404 | __constant_cpu_to_le16(PRINTER_VENDOR_NUM); | |
1405 | device_desc.idProduct = | |
1406 | __constant_cpu_to_le16(PRINTER_PRODUCT_NUM); | |
1407 | ||
1408 | /* support optional vendor/distro customization */ | |
1409 | if (idVendor) { | |
1410 | if (!idProduct) { | |
1411 | dev_err(&gadget->dev, "idVendor needs idProduct!\n"); | |
1412 | return -ENODEV; | |
1413 | } | |
1414 | device_desc.idVendor = cpu_to_le16(idVendor); | |
1415 | device_desc.idProduct = cpu_to_le16(idProduct); | |
1416 | if (bcdDevice) | |
1417 | device_desc.bcdDevice = cpu_to_le16(bcdDevice); | |
1418 | } | |
1419 | ||
1420 | if (iManufacturer) | |
1421 | strlcpy(manufacturer, iManufacturer, sizeof manufacturer); | |
1422 | ||
1423 | if (iProduct) | |
1424 | strlcpy(product_desc, iProduct, sizeof product_desc); | |
1425 | ||
1426 | if (iSerialNum) | |
1427 | strlcpy(serial_num, iSerialNum, sizeof serial_num); | |
1428 | ||
1429 | if (iPNPstring) | |
1430 | strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2); | |
1431 | ||
1432 | len = strlen(pnp_string); | |
1433 | pnp_string[0] = (len >> 8) & 0xFF; | |
1434 | pnp_string[1] = len & 0xFF; | |
1435 | ||
1436 | /* all we really need is bulk IN/OUT */ | |
1437 | usb_ep_autoconfig_reset(gadget); | |
1438 | in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc); | |
1439 | if (!in_ep) { | |
1440 | autoconf_fail: | |
1441 | dev_err(&gadget->dev, "can't autoconfigure on %s\n", | |
1442 | gadget->name); | |
1443 | return -ENODEV; | |
1444 | } | |
1445 | in_ep->driver_data = in_ep; /* claim */ | |
1446 | ||
1447 | out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc); | |
1448 | if (!out_ep) | |
1449 | goto autoconf_fail; | |
1450 | out_ep->driver_data = out_ep; /* claim */ | |
1451 | ||
1452 | #ifdef CONFIG_USB_GADGET_DUALSPEED | |
1453 | /* assumes ep0 uses the same value for both speeds ... */ | |
1454 | dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0; | |
1455 | ||
1456 | /* and that all endpoints are dual-speed */ | |
1457 | hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress; | |
1458 | hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress; | |
1459 | #endif /* DUALSPEED */ | |
1460 | ||
1461 | device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket; | |
1462 | usb_gadget_set_selfpowered(gadget); | |
1463 | ||
1464 | if (gadget->is_otg) { | |
1465 | otg_desc.bmAttributes |= USB_OTG_HNP, | |
1466 | config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP; | |
1467 | config_desc.bMaxPower = 4; | |
1468 | } | |
1469 | ||
1470 | spin_lock_init(&dev->lock); | |
1471 | spin_lock_init(&dev->lock_printer_io); | |
1472 | INIT_LIST_HEAD(&dev->tx_reqs); | |
1473 | INIT_LIST_HEAD(&dev->tx_reqs_active); | |
1474 | INIT_LIST_HEAD(&dev->rx_reqs); | |
1475 | INIT_LIST_HEAD(&dev->rx_reqs_active); | |
1476 | INIT_LIST_HEAD(&dev->rx_buffers); | |
1477 | init_waitqueue_head(&dev->rx_wait); | |
1478 | init_waitqueue_head(&dev->tx_wait); | |
1479 | init_waitqueue_head(&dev->tx_flush_wait); | |
1480 | ||
1481 | dev->config = 0; | |
1482 | dev->interface = -1; | |
1483 | dev->printer_cdev_open = 0; | |
1484 | dev->printer_status = PRINTER_NOT_ERROR; | |
1485 | dev->current_rx_req = NULL; | |
1486 | dev->current_rx_bytes = 0; | |
1487 | dev->current_rx_buf = NULL; | |
1488 | ||
1489 | dev->in_ep = in_ep; | |
1490 | dev->out_ep = out_ep; | |
1491 | ||
1492 | /* preallocate control message data and buffer */ | |
1493 | dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE, | |
1494 | GFP_KERNEL); | |
1495 | if (!dev->req) { | |
1496 | status = -ENOMEM; | |
1497 | goto fail; | |
1498 | } | |
1499 | ||
1500 | for (i = 0; i < QLEN; i++) { | |
1501 | req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL); | |
1502 | if (!req) { | |
1503 | while (!list_empty(&dev->tx_reqs)) { | |
1504 | req = container_of(dev->tx_reqs.next, | |
1505 | struct usb_request, list); | |
1506 | list_del(&req->list); | |
1507 | printer_req_free(dev->in_ep, req); | |
1508 | } | |
1509 | return -ENOMEM; | |
1510 | } | |
1511 | list_add(&req->list, &dev->tx_reqs); | |
1512 | } | |
1513 | ||
1514 | for (i = 0; i < QLEN; i++) { | |
1515 | req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL); | |
1516 | if (!req) { | |
1517 | while (!list_empty(&dev->rx_reqs)) { | |
1518 | req = container_of(dev->rx_reqs.next, | |
1519 | struct usb_request, list); | |
1520 | list_del(&req->list); | |
1521 | printer_req_free(dev->out_ep, req); | |
1522 | } | |
1523 | return -ENOMEM; | |
1524 | } | |
1525 | list_add(&req->list, &dev->rx_reqs); | |
1526 | } | |
1527 | ||
1528 | dev->req->complete = printer_setup_complete; | |
1529 | ||
1530 | /* finish hookup to lower layer ... */ | |
1531 | dev->gadget = gadget; | |
1532 | set_gadget_data(gadget, dev); | |
1533 | gadget->ep0->driver_data = dev; | |
1534 | ||
1535 | INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc); | |
1536 | INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name, | |
1537 | in_ep->name); | |
1538 | ||
1539 | return 0; | |
1540 | ||
1541 | fail: | |
1542 | printer_unbind(gadget); | |
1543 | return status; | |
1544 | } | |
1545 | ||
1546 | /*-------------------------------------------------------------------------*/ | |
1547 | ||
1548 | static struct usb_gadget_driver printer_driver = { | |
1549 | .speed = DEVSPEED, | |
1550 | ||
1551 | .function = (char *) driver_desc, | |
1552 | .bind = printer_bind, | |
1553 | .unbind = printer_unbind, | |
1554 | ||
1555 | .setup = printer_setup, | |
1556 | .disconnect = printer_disconnect, | |
1557 | ||
1558 | .driver = { | |
1559 | .name = (char *) shortname, | |
1560 | .owner = THIS_MODULE, | |
1561 | }, | |
1562 | }; | |
1563 | ||
1564 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1565 | MODULE_AUTHOR("Craig Nadler"); | |
1566 | MODULE_LICENSE("GPL"); | |
1567 | ||
1568 | static int __init | |
1569 | init(void) | |
1570 | { | |
1571 | int status; | |
1572 | ||
1573 | usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget"); | |
1574 | if (IS_ERR(usb_gadget_class)) { | |
1575 | status = PTR_ERR(usb_gadget_class); | |
1576 | ERROR(dev, "unable to create usb_gadget class %d\n", status); | |
1577 | return status; | |
1578 | } | |
1579 | ||
1580 | status = alloc_chrdev_region(&g_printer_devno, 0, 1, | |
1581 | "USB printer gadget"); | |
1582 | if (status) { | |
1583 | ERROR(dev, "alloc_chrdev_region %d\n", status); | |
1584 | class_destroy(usb_gadget_class); | |
1585 | return status; | |
1586 | } | |
1587 | ||
1588 | status = usb_gadget_register_driver(&printer_driver); | |
1589 | if (status) { | |
1590 | class_destroy(usb_gadget_class); | |
1591 | unregister_chrdev_region(g_printer_devno, 1); | |
1592 | DBG(dev, "usb_gadget_register_driver %x\n", status); | |
1593 | } | |
1594 | ||
1595 | return status; | |
1596 | } | |
1597 | module_init(init); | |
1598 | ||
1599 | static void __exit | |
1600 | cleanup(void) | |
1601 | { | |
1602 | int status; | |
1603 | ||
1604 | spin_lock(&usb_printer_gadget.lock_printer_io); | |
1605 | class_destroy(usb_gadget_class); | |
1606 | unregister_chrdev_region(g_printer_devno, 2); | |
1607 | ||
1608 | status = usb_gadget_unregister_driver(&printer_driver); | |
1609 | if (status) | |
1610 | ERROR(dev, "usb_gadget_unregister_driver %x\n", status); | |
1611 | ||
1612 | spin_unlock(&usb_printer_gadget.lock_printer_io); | |
1613 | } | |
1614 | module_exit(cleanup); |