Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 1 | /* |
| 2 | * f_printer.c - USB printer function driver |
| 3 | * |
| 4 | * Copied from drivers/usb/gadget/legacy/printer.c, |
| 5 | * which was: |
| 6 | * |
| 7 | * printer.c -- Printer gadget driver |
| 8 | * |
| 9 | * Copyright (C) 2003-2005 David Brownell |
| 10 | * Copyright (C) 2006 Craig W. Nadler |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/ioport.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/mutex.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/init.h> |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 27 | #include <linux/idr.h> |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 28 | #include <linux/timer.h> |
| 29 | #include <linux/list.h> |
| 30 | #include <linux/interrupt.h> |
| 31 | #include <linux/device.h> |
| 32 | #include <linux/moduleparam.h> |
| 33 | #include <linux/fs.h> |
| 34 | #include <linux/poll.h> |
| 35 | #include <linux/types.h> |
| 36 | #include <linux/ctype.h> |
| 37 | #include <linux/cdev.h> |
| 38 | |
| 39 | #include <asm/byteorder.h> |
| 40 | #include <linux/io.h> |
| 41 | #include <linux/irq.h> |
| 42 | #include <linux/uaccess.h> |
| 43 | #include <asm/unaligned.h> |
| 44 | |
| 45 | #include <linux/usb/ch9.h> |
| 46 | #include <linux/usb/composite.h> |
| 47 | #include <linux/usb/gadget.h> |
| 48 | #include <linux/usb/g_printer.h> |
| 49 | |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 50 | #include "u_printer.h" |
| 51 | |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 52 | #define PNP_STRING_LEN 1024 |
| 53 | #define PRINTER_MINORS 4 |
| 54 | #define GET_DEVICE_ID 0 |
| 55 | #define GET_PORT_STATUS 1 |
| 56 | #define SOFT_RESET 2 |
| 57 | |
| 58 | static int major, minors; |
| 59 | static struct class *usb_gadget_class; |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 60 | static DEFINE_IDA(printer_ida); |
| 61 | static DEFINE_MUTEX(printer_ida_lock); /* protects access do printer_ida */ |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 62 | |
| 63 | /*-------------------------------------------------------------------------*/ |
| 64 | |
| 65 | struct printer_dev { |
| 66 | spinlock_t lock; /* lock this structure */ |
| 67 | /* lock buffer lists during read/write calls */ |
| 68 | struct mutex lock_printer_io; |
| 69 | struct usb_gadget *gadget; |
| 70 | s8 interface; |
| 71 | struct usb_ep *in_ep, *out_ep; |
| 72 | |
| 73 | struct list_head rx_reqs; /* List of free RX structs */ |
| 74 | struct list_head rx_reqs_active; /* List of Active RX xfers */ |
| 75 | struct list_head rx_buffers; /* List of completed xfers */ |
| 76 | /* wait until there is data to be read. */ |
| 77 | wait_queue_head_t rx_wait; |
| 78 | struct list_head tx_reqs; /* List of free TX structs */ |
| 79 | struct list_head tx_reqs_active; /* List of Active TX xfers */ |
| 80 | /* Wait until there are write buffers available to use. */ |
| 81 | wait_queue_head_t tx_wait; |
| 82 | /* Wait until all write buffers have been sent. */ |
| 83 | wait_queue_head_t tx_flush_wait; |
| 84 | struct usb_request *current_rx_req; |
| 85 | size_t current_rx_bytes; |
| 86 | u8 *current_rx_buf; |
| 87 | u8 printer_status; |
| 88 | u8 reset_printer; |
| 89 | int minor; |
| 90 | struct cdev printer_cdev; |
| 91 | u8 printer_cdev_open; |
| 92 | wait_queue_head_t wait; |
| 93 | unsigned q_len; |
| 94 | char *pnp_string; /* We don't own memory! */ |
| 95 | struct usb_function function; |
| 96 | }; |
| 97 | |
| 98 | static inline struct printer_dev *func_to_printer(struct usb_function *f) |
| 99 | { |
| 100 | return container_of(f, struct printer_dev, function); |
| 101 | } |
| 102 | |
| 103 | /*-------------------------------------------------------------------------*/ |
| 104 | |
| 105 | /* |
| 106 | * DESCRIPTORS ... most are static, but strings and (full) configuration |
| 107 | * descriptors are built on demand. |
| 108 | */ |
| 109 | |
| 110 | /* holds our biggest descriptor */ |
| 111 | #define USB_DESC_BUFSIZE 256 |
| 112 | #define USB_BUFSIZE 8192 |
| 113 | |
| 114 | static struct usb_interface_descriptor intf_desc = { |
| 115 | .bLength = sizeof(intf_desc), |
| 116 | .bDescriptorType = USB_DT_INTERFACE, |
| 117 | .bNumEndpoints = 2, |
| 118 | .bInterfaceClass = USB_CLASS_PRINTER, |
| 119 | .bInterfaceSubClass = 1, /* Printer Sub-Class */ |
| 120 | .bInterfaceProtocol = 2, /* Bi-Directional */ |
| 121 | .iInterface = 0 |
| 122 | }; |
| 123 | |
| 124 | static struct usb_endpoint_descriptor fs_ep_in_desc = { |
| 125 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 126 | .bDescriptorType = USB_DT_ENDPOINT, |
| 127 | .bEndpointAddress = USB_DIR_IN, |
| 128 | .bmAttributes = USB_ENDPOINT_XFER_BULK |
| 129 | }; |
| 130 | |
| 131 | static struct usb_endpoint_descriptor fs_ep_out_desc = { |
| 132 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 133 | .bDescriptorType = USB_DT_ENDPOINT, |
| 134 | .bEndpointAddress = USB_DIR_OUT, |
| 135 | .bmAttributes = USB_ENDPOINT_XFER_BULK |
| 136 | }; |
| 137 | |
| 138 | static struct usb_descriptor_header *fs_printer_function[] = { |
| 139 | (struct usb_descriptor_header *) &intf_desc, |
| 140 | (struct usb_descriptor_header *) &fs_ep_in_desc, |
| 141 | (struct usb_descriptor_header *) &fs_ep_out_desc, |
| 142 | NULL |
| 143 | }; |
| 144 | |
| 145 | /* |
| 146 | * usb 2.0 devices need to expose both high speed and full speed |
| 147 | * descriptors, unless they only run at full speed. |
| 148 | */ |
| 149 | |
| 150 | static struct usb_endpoint_descriptor hs_ep_in_desc = { |
| 151 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 152 | .bDescriptorType = USB_DT_ENDPOINT, |
| 153 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 154 | .wMaxPacketSize = cpu_to_le16(512) |
| 155 | }; |
| 156 | |
| 157 | static struct usb_endpoint_descriptor hs_ep_out_desc = { |
| 158 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 159 | .bDescriptorType = USB_DT_ENDPOINT, |
| 160 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 161 | .wMaxPacketSize = cpu_to_le16(512) |
| 162 | }; |
| 163 | |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 164 | static struct usb_descriptor_header *hs_printer_function[] = { |
| 165 | (struct usb_descriptor_header *) &intf_desc, |
| 166 | (struct usb_descriptor_header *) &hs_ep_in_desc, |
| 167 | (struct usb_descriptor_header *) &hs_ep_out_desc, |
| 168 | NULL |
| 169 | }; |
| 170 | |
| 171 | /* |
| 172 | * Added endpoint descriptors for 3.0 devices |
| 173 | */ |
| 174 | |
| 175 | static struct usb_endpoint_descriptor ss_ep_in_desc = { |
| 176 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 177 | .bDescriptorType = USB_DT_ENDPOINT, |
| 178 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 179 | .wMaxPacketSize = cpu_to_le16(1024), |
| 180 | }; |
| 181 | |
| 182 | static struct usb_ss_ep_comp_descriptor ss_ep_in_comp_desc = { |
| 183 | .bLength = sizeof(ss_ep_in_comp_desc), |
| 184 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
| 185 | }; |
| 186 | |
| 187 | static struct usb_endpoint_descriptor ss_ep_out_desc = { |
| 188 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 189 | .bDescriptorType = USB_DT_ENDPOINT, |
| 190 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 191 | .wMaxPacketSize = cpu_to_le16(1024), |
| 192 | }; |
| 193 | |
| 194 | static struct usb_ss_ep_comp_descriptor ss_ep_out_comp_desc = { |
| 195 | .bLength = sizeof(ss_ep_out_comp_desc), |
| 196 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
| 197 | }; |
| 198 | |
| 199 | static struct usb_descriptor_header *ss_printer_function[] = { |
| 200 | (struct usb_descriptor_header *) &intf_desc, |
| 201 | (struct usb_descriptor_header *) &ss_ep_in_desc, |
| 202 | (struct usb_descriptor_header *) &ss_ep_in_comp_desc, |
| 203 | (struct usb_descriptor_header *) &ss_ep_out_desc, |
| 204 | (struct usb_descriptor_header *) &ss_ep_out_comp_desc, |
| 205 | NULL |
| 206 | }; |
| 207 | |
| 208 | /* maxpacket and other transfer characteristics vary by speed. */ |
| 209 | static inline struct usb_endpoint_descriptor *ep_desc(struct usb_gadget *gadget, |
| 210 | struct usb_endpoint_descriptor *fs, |
| 211 | struct usb_endpoint_descriptor *hs, |
| 212 | struct usb_endpoint_descriptor *ss) |
| 213 | { |
| 214 | switch (gadget->speed) { |
| 215 | case USB_SPEED_SUPER: |
| 216 | return ss; |
| 217 | case USB_SPEED_HIGH: |
| 218 | return hs; |
| 219 | default: |
| 220 | return fs; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | /*-------------------------------------------------------------------------*/ |
| 225 | |
| 226 | static struct usb_request * |
| 227 | printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags) |
| 228 | { |
| 229 | struct usb_request *req; |
| 230 | |
| 231 | req = usb_ep_alloc_request(ep, gfp_flags); |
| 232 | |
| 233 | if (req != NULL) { |
| 234 | req->length = len; |
| 235 | req->buf = kmalloc(len, gfp_flags); |
| 236 | if (req->buf == NULL) { |
| 237 | usb_ep_free_request(ep, req); |
| 238 | return NULL; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | return req; |
| 243 | } |
| 244 | |
| 245 | static void |
| 246 | printer_req_free(struct usb_ep *ep, struct usb_request *req) |
| 247 | { |
| 248 | if (ep != NULL && req != NULL) { |
| 249 | kfree(req->buf); |
| 250 | usb_ep_free_request(ep, req); |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | /*-------------------------------------------------------------------------*/ |
| 255 | |
| 256 | static void rx_complete(struct usb_ep *ep, struct usb_request *req) |
| 257 | { |
| 258 | struct printer_dev *dev = ep->driver_data; |
| 259 | int status = req->status; |
| 260 | unsigned long flags; |
| 261 | |
| 262 | spin_lock_irqsave(&dev->lock, flags); |
| 263 | |
| 264 | list_del_init(&req->list); /* Remode from Active List */ |
| 265 | |
| 266 | switch (status) { |
| 267 | |
| 268 | /* normal completion */ |
| 269 | case 0: |
| 270 | if (req->actual > 0) { |
| 271 | list_add_tail(&req->list, &dev->rx_buffers); |
| 272 | DBG(dev, "G_Printer : rx length %d\n", req->actual); |
| 273 | } else { |
| 274 | list_add(&req->list, &dev->rx_reqs); |
| 275 | } |
| 276 | break; |
| 277 | |
| 278 | /* software-driven interface shutdown */ |
| 279 | case -ECONNRESET: /* unlink */ |
| 280 | case -ESHUTDOWN: /* disconnect etc */ |
| 281 | VDBG(dev, "rx shutdown, code %d\n", status); |
| 282 | list_add(&req->list, &dev->rx_reqs); |
| 283 | break; |
| 284 | |
| 285 | /* for hardware automagic (such as pxa) */ |
| 286 | case -ECONNABORTED: /* endpoint reset */ |
| 287 | DBG(dev, "rx %s reset\n", ep->name); |
| 288 | list_add(&req->list, &dev->rx_reqs); |
| 289 | break; |
| 290 | |
| 291 | /* data overrun */ |
| 292 | case -EOVERFLOW: |
| 293 | /* FALLTHROUGH */ |
| 294 | |
| 295 | default: |
| 296 | DBG(dev, "rx status %d\n", status); |
| 297 | list_add(&req->list, &dev->rx_reqs); |
| 298 | break; |
| 299 | } |
| 300 | |
| 301 | wake_up_interruptible(&dev->rx_wait); |
| 302 | spin_unlock_irqrestore(&dev->lock, flags); |
| 303 | } |
| 304 | |
| 305 | static void tx_complete(struct usb_ep *ep, struct usb_request *req) |
| 306 | { |
| 307 | struct printer_dev *dev = ep->driver_data; |
| 308 | |
| 309 | switch (req->status) { |
| 310 | default: |
| 311 | VDBG(dev, "tx err %d\n", req->status); |
| 312 | /* FALLTHROUGH */ |
| 313 | case -ECONNRESET: /* unlink */ |
| 314 | case -ESHUTDOWN: /* disconnect etc */ |
| 315 | break; |
| 316 | case 0: |
| 317 | break; |
| 318 | } |
| 319 | |
| 320 | spin_lock(&dev->lock); |
| 321 | /* Take the request struct off the active list and put it on the |
| 322 | * free list. |
| 323 | */ |
| 324 | list_del_init(&req->list); |
| 325 | list_add(&req->list, &dev->tx_reqs); |
| 326 | wake_up_interruptible(&dev->tx_wait); |
| 327 | if (likely(list_empty(&dev->tx_reqs_active))) |
| 328 | wake_up_interruptible(&dev->tx_flush_wait); |
| 329 | |
| 330 | spin_unlock(&dev->lock); |
| 331 | } |
| 332 | |
| 333 | /*-------------------------------------------------------------------------*/ |
| 334 | |
| 335 | static int |
| 336 | printer_open(struct inode *inode, struct file *fd) |
| 337 | { |
| 338 | struct printer_dev *dev; |
| 339 | unsigned long flags; |
| 340 | int ret = -EBUSY; |
| 341 | |
| 342 | dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev); |
| 343 | |
| 344 | spin_lock_irqsave(&dev->lock, flags); |
| 345 | |
| 346 | if (!dev->printer_cdev_open) { |
| 347 | dev->printer_cdev_open = 1; |
| 348 | fd->private_data = dev; |
| 349 | ret = 0; |
| 350 | /* Change the printer status to show that it's on-line. */ |
| 351 | dev->printer_status |= PRINTER_SELECTED; |
| 352 | } |
| 353 | |
| 354 | spin_unlock_irqrestore(&dev->lock, flags); |
| 355 | |
| 356 | DBG(dev, "printer_open returned %x\n", ret); |
| 357 | return ret; |
| 358 | } |
| 359 | |
| 360 | static int |
| 361 | printer_close(struct inode *inode, struct file *fd) |
| 362 | { |
| 363 | struct printer_dev *dev = fd->private_data; |
| 364 | unsigned long flags; |
| 365 | |
| 366 | spin_lock_irqsave(&dev->lock, flags); |
| 367 | dev->printer_cdev_open = 0; |
| 368 | fd->private_data = NULL; |
| 369 | /* Change printer status to show that the printer is off-line. */ |
| 370 | dev->printer_status &= ~PRINTER_SELECTED; |
| 371 | spin_unlock_irqrestore(&dev->lock, flags); |
| 372 | |
| 373 | DBG(dev, "printer_close\n"); |
| 374 | |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | /* This function must be called with interrupts turned off. */ |
| 379 | static void |
| 380 | setup_rx_reqs(struct printer_dev *dev) |
| 381 | { |
| 382 | struct usb_request *req; |
| 383 | |
| 384 | while (likely(!list_empty(&dev->rx_reqs))) { |
| 385 | int error; |
| 386 | |
| 387 | req = container_of(dev->rx_reqs.next, |
| 388 | struct usb_request, list); |
| 389 | list_del_init(&req->list); |
| 390 | |
| 391 | /* The USB Host sends us whatever amount of data it wants to |
| 392 | * so we always set the length field to the full USB_BUFSIZE. |
| 393 | * If the amount of data is more than the read() caller asked |
| 394 | * for it will be stored in the request buffer until it is |
| 395 | * asked for by read(). |
| 396 | */ |
| 397 | req->length = USB_BUFSIZE; |
| 398 | req->complete = rx_complete; |
| 399 | |
| 400 | /* here, we unlock, and only unlock, to avoid deadlock. */ |
| 401 | spin_unlock(&dev->lock); |
| 402 | error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC); |
| 403 | spin_lock(&dev->lock); |
| 404 | if (error) { |
| 405 | DBG(dev, "rx submit --> %d\n", error); |
| 406 | list_add(&req->list, &dev->rx_reqs); |
| 407 | break; |
| 408 | } |
| 409 | /* if the req is empty, then add it into dev->rx_reqs_active. */ |
| 410 | else if (list_empty(&req->list)) |
| 411 | list_add(&req->list, &dev->rx_reqs_active); |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | static ssize_t |
| 416 | printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr) |
| 417 | { |
| 418 | struct printer_dev *dev = fd->private_data; |
| 419 | unsigned long flags; |
| 420 | size_t size; |
| 421 | size_t bytes_copied; |
| 422 | struct usb_request *req; |
| 423 | /* This is a pointer to the current USB rx request. */ |
| 424 | struct usb_request *current_rx_req; |
| 425 | /* This is the number of bytes in the current rx buffer. */ |
| 426 | size_t current_rx_bytes; |
| 427 | /* This is a pointer to the current rx buffer. */ |
| 428 | u8 *current_rx_buf; |
| 429 | |
| 430 | if (len == 0) |
| 431 | return -EINVAL; |
| 432 | |
| 433 | DBG(dev, "printer_read trying to read %d bytes\n", (int)len); |
| 434 | |
| 435 | mutex_lock(&dev->lock_printer_io); |
| 436 | spin_lock_irqsave(&dev->lock, flags); |
| 437 | |
| 438 | /* We will use this flag later to check if a printer reset happened |
| 439 | * after we turn interrupts back on. |
| 440 | */ |
| 441 | dev->reset_printer = 0; |
| 442 | |
| 443 | setup_rx_reqs(dev); |
| 444 | |
| 445 | bytes_copied = 0; |
| 446 | current_rx_req = dev->current_rx_req; |
| 447 | current_rx_bytes = dev->current_rx_bytes; |
| 448 | current_rx_buf = dev->current_rx_buf; |
| 449 | dev->current_rx_req = NULL; |
| 450 | dev->current_rx_bytes = 0; |
| 451 | dev->current_rx_buf = NULL; |
| 452 | |
| 453 | /* Check if there is any data in the read buffers. Please note that |
| 454 | * current_rx_bytes is the number of bytes in the current rx buffer. |
| 455 | * If it is zero then check if there are any other rx_buffers that |
| 456 | * are on the completed list. We are only out of data if all rx |
| 457 | * buffers are empty. |
| 458 | */ |
| 459 | if ((current_rx_bytes == 0) && |
| 460 | (likely(list_empty(&dev->rx_buffers)))) { |
| 461 | /* Turn interrupts back on before sleeping. */ |
| 462 | spin_unlock_irqrestore(&dev->lock, flags); |
| 463 | |
| 464 | /* |
| 465 | * If no data is available check if this is a NON-Blocking |
| 466 | * call or not. |
| 467 | */ |
| 468 | if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { |
| 469 | mutex_unlock(&dev->lock_printer_io); |
| 470 | return -EAGAIN; |
| 471 | } |
| 472 | |
| 473 | /* Sleep until data is available */ |
| 474 | wait_event_interruptible(dev->rx_wait, |
| 475 | (likely(!list_empty(&dev->rx_buffers)))); |
| 476 | spin_lock_irqsave(&dev->lock, flags); |
| 477 | } |
| 478 | |
| 479 | /* We have data to return then copy it to the caller's buffer.*/ |
| 480 | while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers))) |
| 481 | && len) { |
| 482 | if (current_rx_bytes == 0) { |
| 483 | req = container_of(dev->rx_buffers.next, |
| 484 | struct usb_request, list); |
| 485 | list_del_init(&req->list); |
| 486 | |
| 487 | if (req->actual && req->buf) { |
| 488 | current_rx_req = req; |
| 489 | current_rx_bytes = req->actual; |
| 490 | current_rx_buf = req->buf; |
| 491 | } else { |
| 492 | list_add(&req->list, &dev->rx_reqs); |
| 493 | continue; |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | /* Don't leave irqs off while doing memory copies */ |
| 498 | spin_unlock_irqrestore(&dev->lock, flags); |
| 499 | |
| 500 | if (len > current_rx_bytes) |
| 501 | size = current_rx_bytes; |
| 502 | else |
| 503 | size = len; |
| 504 | |
| 505 | size -= copy_to_user(buf, current_rx_buf, size); |
| 506 | bytes_copied += size; |
| 507 | len -= size; |
| 508 | buf += size; |
| 509 | |
| 510 | spin_lock_irqsave(&dev->lock, flags); |
| 511 | |
| 512 | /* We've disconnected or reset so return. */ |
| 513 | if (dev->reset_printer) { |
| 514 | list_add(¤t_rx_req->list, &dev->rx_reqs); |
| 515 | spin_unlock_irqrestore(&dev->lock, flags); |
| 516 | mutex_unlock(&dev->lock_printer_io); |
| 517 | return -EAGAIN; |
| 518 | } |
| 519 | |
| 520 | /* If we not returning all the data left in this RX request |
| 521 | * buffer then adjust the amount of data left in the buffer. |
| 522 | * Othewise if we are done with this RX request buffer then |
| 523 | * requeue it to get any incoming data from the USB host. |
| 524 | */ |
| 525 | if (size < current_rx_bytes) { |
| 526 | current_rx_bytes -= size; |
| 527 | current_rx_buf += size; |
| 528 | } else { |
| 529 | list_add(¤t_rx_req->list, &dev->rx_reqs); |
| 530 | current_rx_bytes = 0; |
| 531 | current_rx_buf = NULL; |
| 532 | current_rx_req = NULL; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | dev->current_rx_req = current_rx_req; |
| 537 | dev->current_rx_bytes = current_rx_bytes; |
| 538 | dev->current_rx_buf = current_rx_buf; |
| 539 | |
| 540 | spin_unlock_irqrestore(&dev->lock, flags); |
| 541 | mutex_unlock(&dev->lock_printer_io); |
| 542 | |
| 543 | DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied); |
| 544 | |
| 545 | if (bytes_copied) |
| 546 | return bytes_copied; |
| 547 | else |
| 548 | return -EAGAIN; |
| 549 | } |
| 550 | |
| 551 | static ssize_t |
| 552 | printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr) |
| 553 | { |
| 554 | struct printer_dev *dev = fd->private_data; |
| 555 | unsigned long flags; |
| 556 | size_t size; /* Amount of data in a TX request. */ |
| 557 | size_t bytes_copied = 0; |
| 558 | struct usb_request *req; |
| 559 | |
| 560 | DBG(dev, "printer_write trying to send %d bytes\n", (int)len); |
| 561 | |
| 562 | if (len == 0) |
| 563 | return -EINVAL; |
| 564 | |
| 565 | mutex_lock(&dev->lock_printer_io); |
| 566 | spin_lock_irqsave(&dev->lock, flags); |
| 567 | |
| 568 | /* Check if a printer reset happens while we have interrupts on */ |
| 569 | dev->reset_printer = 0; |
| 570 | |
| 571 | /* Check if there is any available write buffers */ |
| 572 | if (likely(list_empty(&dev->tx_reqs))) { |
| 573 | /* Turn interrupts back on before sleeping. */ |
| 574 | spin_unlock_irqrestore(&dev->lock, flags); |
| 575 | |
| 576 | /* |
| 577 | * If write buffers are available check if this is |
| 578 | * a NON-Blocking call or not. |
| 579 | */ |
| 580 | if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { |
| 581 | mutex_unlock(&dev->lock_printer_io); |
| 582 | return -EAGAIN; |
| 583 | } |
| 584 | |
| 585 | /* Sleep until a write buffer is available */ |
| 586 | wait_event_interruptible(dev->tx_wait, |
| 587 | (likely(!list_empty(&dev->tx_reqs)))); |
| 588 | spin_lock_irqsave(&dev->lock, flags); |
| 589 | } |
| 590 | |
| 591 | while (likely(!list_empty(&dev->tx_reqs)) && len) { |
| 592 | |
| 593 | if (len > USB_BUFSIZE) |
| 594 | size = USB_BUFSIZE; |
| 595 | else |
| 596 | size = len; |
| 597 | |
| 598 | req = container_of(dev->tx_reqs.next, struct usb_request, |
| 599 | list); |
| 600 | list_del_init(&req->list); |
| 601 | |
| 602 | req->complete = tx_complete; |
| 603 | req->length = size; |
| 604 | |
| 605 | /* Check if we need to send a zero length packet. */ |
| 606 | if (len > size) |
| 607 | /* They will be more TX requests so no yet. */ |
| 608 | req->zero = 0; |
| 609 | else |
| 610 | /* If the data amount is not a multiple of the |
| 611 | * maxpacket size then send a zero length packet. |
| 612 | */ |
| 613 | req->zero = ((len % dev->in_ep->maxpacket) == 0); |
| 614 | |
| 615 | /* Don't leave irqs off while doing memory copies */ |
| 616 | spin_unlock_irqrestore(&dev->lock, flags); |
| 617 | |
| 618 | if (copy_from_user(req->buf, buf, size)) { |
| 619 | list_add(&req->list, &dev->tx_reqs); |
| 620 | mutex_unlock(&dev->lock_printer_io); |
| 621 | return bytes_copied; |
| 622 | } |
| 623 | |
| 624 | bytes_copied += size; |
| 625 | len -= size; |
| 626 | buf += size; |
| 627 | |
| 628 | spin_lock_irqsave(&dev->lock, flags); |
| 629 | |
| 630 | /* We've disconnected or reset so free the req and buffer */ |
| 631 | if (dev->reset_printer) { |
| 632 | list_add(&req->list, &dev->tx_reqs); |
| 633 | spin_unlock_irqrestore(&dev->lock, flags); |
| 634 | mutex_unlock(&dev->lock_printer_io); |
| 635 | return -EAGAIN; |
| 636 | } |
| 637 | |
| 638 | if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) { |
| 639 | list_add(&req->list, &dev->tx_reqs); |
| 640 | spin_unlock_irqrestore(&dev->lock, flags); |
| 641 | mutex_unlock(&dev->lock_printer_io); |
| 642 | return -EAGAIN; |
| 643 | } |
| 644 | |
| 645 | list_add(&req->list, &dev->tx_reqs_active); |
| 646 | |
| 647 | } |
| 648 | |
| 649 | spin_unlock_irqrestore(&dev->lock, flags); |
| 650 | mutex_unlock(&dev->lock_printer_io); |
| 651 | |
| 652 | DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied); |
| 653 | |
| 654 | if (bytes_copied) |
| 655 | return bytes_copied; |
| 656 | else |
| 657 | return -EAGAIN; |
| 658 | } |
| 659 | |
| 660 | static int |
| 661 | printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync) |
| 662 | { |
| 663 | struct printer_dev *dev = fd->private_data; |
| 664 | struct inode *inode = file_inode(fd); |
| 665 | unsigned long flags; |
| 666 | int tx_list_empty; |
| 667 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 668 | inode_lock(inode); |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 669 | spin_lock_irqsave(&dev->lock, flags); |
| 670 | tx_list_empty = (likely(list_empty(&dev->tx_reqs))); |
| 671 | spin_unlock_irqrestore(&dev->lock, flags); |
| 672 | |
| 673 | if (!tx_list_empty) { |
| 674 | /* Sleep until all data has been sent */ |
| 675 | wait_event_interruptible(dev->tx_flush_wait, |
| 676 | (likely(list_empty(&dev->tx_reqs_active)))); |
| 677 | } |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 678 | inode_unlock(inode); |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 679 | |
| 680 | return 0; |
| 681 | } |
| 682 | |
| 683 | static unsigned int |
| 684 | printer_poll(struct file *fd, poll_table *wait) |
| 685 | { |
| 686 | struct printer_dev *dev = fd->private_data; |
| 687 | unsigned long flags; |
| 688 | int status = 0; |
| 689 | |
| 690 | mutex_lock(&dev->lock_printer_io); |
| 691 | spin_lock_irqsave(&dev->lock, flags); |
| 692 | setup_rx_reqs(dev); |
| 693 | spin_unlock_irqrestore(&dev->lock, flags); |
| 694 | mutex_unlock(&dev->lock_printer_io); |
| 695 | |
| 696 | poll_wait(fd, &dev->rx_wait, wait); |
| 697 | poll_wait(fd, &dev->tx_wait, wait); |
| 698 | |
| 699 | spin_lock_irqsave(&dev->lock, flags); |
| 700 | if (likely(!list_empty(&dev->tx_reqs))) |
| 701 | status |= POLLOUT | POLLWRNORM; |
| 702 | |
| 703 | if (likely(dev->current_rx_bytes) || |
| 704 | likely(!list_empty(&dev->rx_buffers))) |
| 705 | status |= POLLIN | POLLRDNORM; |
| 706 | |
| 707 | spin_unlock_irqrestore(&dev->lock, flags); |
| 708 | |
| 709 | return status; |
| 710 | } |
| 711 | |
| 712 | static long |
| 713 | printer_ioctl(struct file *fd, unsigned int code, unsigned long arg) |
| 714 | { |
| 715 | struct printer_dev *dev = fd->private_data; |
| 716 | unsigned long flags; |
| 717 | int status = 0; |
| 718 | |
| 719 | DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg); |
| 720 | |
| 721 | /* handle ioctls */ |
| 722 | |
| 723 | spin_lock_irqsave(&dev->lock, flags); |
| 724 | |
| 725 | switch (code) { |
| 726 | case GADGET_GET_PRINTER_STATUS: |
| 727 | status = (int)dev->printer_status; |
| 728 | break; |
| 729 | case GADGET_SET_PRINTER_STATUS: |
| 730 | dev->printer_status = (u8)arg; |
| 731 | break; |
| 732 | default: |
| 733 | /* could not handle ioctl */ |
| 734 | DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n", |
| 735 | code); |
| 736 | status = -ENOTTY; |
| 737 | } |
| 738 | |
| 739 | spin_unlock_irqrestore(&dev->lock, flags); |
| 740 | |
| 741 | return status; |
| 742 | } |
| 743 | |
| 744 | /* used after endpoint configuration */ |
| 745 | static const struct file_operations printer_io_operations = { |
| 746 | .owner = THIS_MODULE, |
| 747 | .open = printer_open, |
| 748 | .read = printer_read, |
| 749 | .write = printer_write, |
| 750 | .fsync = printer_fsync, |
| 751 | .poll = printer_poll, |
| 752 | .unlocked_ioctl = printer_ioctl, |
| 753 | .release = printer_close, |
| 754 | .llseek = noop_llseek, |
| 755 | }; |
| 756 | |
| 757 | /*-------------------------------------------------------------------------*/ |
| 758 | |
| 759 | static int |
| 760 | set_printer_interface(struct printer_dev *dev) |
| 761 | { |
| 762 | int result = 0; |
| 763 | |
| 764 | dev->in_ep->desc = ep_desc(dev->gadget, &fs_ep_in_desc, &hs_ep_in_desc, |
| 765 | &ss_ep_in_desc); |
| 766 | dev->in_ep->driver_data = dev; |
| 767 | |
| 768 | dev->out_ep->desc = ep_desc(dev->gadget, &fs_ep_out_desc, |
| 769 | &hs_ep_out_desc, &ss_ep_out_desc); |
| 770 | dev->out_ep->driver_data = dev; |
| 771 | |
| 772 | result = usb_ep_enable(dev->in_ep); |
| 773 | if (result != 0) { |
| 774 | DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result); |
| 775 | goto done; |
| 776 | } |
| 777 | |
| 778 | result = usb_ep_enable(dev->out_ep); |
| 779 | if (result != 0) { |
| 780 | DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result); |
| 781 | goto done; |
| 782 | } |
| 783 | |
| 784 | done: |
| 785 | /* on error, disable any endpoints */ |
| 786 | if (result != 0) { |
| 787 | (void) usb_ep_disable(dev->in_ep); |
| 788 | (void) usb_ep_disable(dev->out_ep); |
| 789 | dev->in_ep->desc = NULL; |
| 790 | dev->out_ep->desc = NULL; |
| 791 | } |
| 792 | |
| 793 | /* caller is responsible for cleanup on error */ |
| 794 | return result; |
| 795 | } |
| 796 | |
| 797 | static void printer_reset_interface(struct printer_dev *dev) |
| 798 | { |
Fupan Li | a24b071 | 2015-08-03 19:19:43 +0800 | [diff] [blame] | 799 | unsigned long flags; |
| 800 | |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 801 | if (dev->interface < 0) |
| 802 | return; |
| 803 | |
| 804 | DBG(dev, "%s\n", __func__); |
| 805 | |
| 806 | if (dev->in_ep->desc) |
| 807 | usb_ep_disable(dev->in_ep); |
| 808 | |
| 809 | if (dev->out_ep->desc) |
| 810 | usb_ep_disable(dev->out_ep); |
| 811 | |
Fupan Li | a24b071 | 2015-08-03 19:19:43 +0800 | [diff] [blame] | 812 | spin_lock_irqsave(&dev->lock, flags); |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 813 | dev->in_ep->desc = NULL; |
| 814 | dev->out_ep->desc = NULL; |
| 815 | dev->interface = -1; |
Fupan Li | a24b071 | 2015-08-03 19:19:43 +0800 | [diff] [blame] | 816 | spin_unlock_irqrestore(&dev->lock, flags); |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 817 | } |
| 818 | |
| 819 | /* Change our operational Interface. */ |
| 820 | static int set_interface(struct printer_dev *dev, unsigned number) |
| 821 | { |
| 822 | int result = 0; |
| 823 | |
| 824 | /* Free the current interface */ |
| 825 | printer_reset_interface(dev); |
| 826 | |
| 827 | result = set_printer_interface(dev); |
| 828 | if (result) |
| 829 | printer_reset_interface(dev); |
| 830 | else |
| 831 | dev->interface = number; |
| 832 | |
| 833 | if (!result) |
| 834 | INFO(dev, "Using interface %x\n", number); |
| 835 | |
| 836 | return result; |
| 837 | } |
| 838 | |
| 839 | static void printer_soft_reset(struct printer_dev *dev) |
| 840 | { |
| 841 | struct usb_request *req; |
| 842 | |
| 843 | INFO(dev, "Received Printer Reset Request\n"); |
| 844 | |
| 845 | if (usb_ep_disable(dev->in_ep)) |
| 846 | DBG(dev, "Failed to disable USB in_ep\n"); |
| 847 | if (usb_ep_disable(dev->out_ep)) |
| 848 | DBG(dev, "Failed to disable USB out_ep\n"); |
| 849 | |
| 850 | if (dev->current_rx_req != NULL) { |
| 851 | list_add(&dev->current_rx_req->list, &dev->rx_reqs); |
| 852 | dev->current_rx_req = NULL; |
| 853 | } |
| 854 | dev->current_rx_bytes = 0; |
| 855 | dev->current_rx_buf = NULL; |
| 856 | dev->reset_printer = 1; |
| 857 | |
| 858 | while (likely(!(list_empty(&dev->rx_buffers)))) { |
| 859 | req = container_of(dev->rx_buffers.next, struct usb_request, |
| 860 | list); |
| 861 | list_del_init(&req->list); |
| 862 | list_add(&req->list, &dev->rx_reqs); |
| 863 | } |
| 864 | |
| 865 | while (likely(!(list_empty(&dev->rx_reqs_active)))) { |
| 866 | req = container_of(dev->rx_buffers.next, struct usb_request, |
| 867 | list); |
| 868 | list_del_init(&req->list); |
| 869 | list_add(&req->list, &dev->rx_reqs); |
| 870 | } |
| 871 | |
| 872 | while (likely(!(list_empty(&dev->tx_reqs_active)))) { |
| 873 | req = container_of(dev->tx_reqs_active.next, |
| 874 | struct usb_request, list); |
| 875 | list_del_init(&req->list); |
| 876 | list_add(&req->list, &dev->tx_reqs); |
| 877 | } |
| 878 | |
| 879 | if (usb_ep_enable(dev->in_ep)) |
| 880 | DBG(dev, "Failed to enable USB in_ep\n"); |
| 881 | if (usb_ep_enable(dev->out_ep)) |
| 882 | DBG(dev, "Failed to enable USB out_ep\n"); |
| 883 | |
| 884 | wake_up_interruptible(&dev->rx_wait); |
| 885 | wake_up_interruptible(&dev->tx_wait); |
| 886 | wake_up_interruptible(&dev->tx_flush_wait); |
| 887 | } |
| 888 | |
| 889 | /*-------------------------------------------------------------------------*/ |
| 890 | |
| 891 | static bool gprinter_req_match(struct usb_function *f, |
| 892 | const struct usb_ctrlrequest *ctrl) |
| 893 | { |
| 894 | struct printer_dev *dev = func_to_printer(f); |
| 895 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
| 896 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 897 | u16 w_length = le16_to_cpu(ctrl->wLength); |
| 898 | |
| 899 | if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE || |
| 900 | (ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) |
| 901 | return false; |
| 902 | |
| 903 | switch (ctrl->bRequest) { |
| 904 | case GET_DEVICE_ID: |
| 905 | w_index >>= 8; |
| 906 | if (w_length <= PNP_STRING_LEN && |
| 907 | (USB_DIR_IN & ctrl->bRequestType)) |
| 908 | break; |
| 909 | return false; |
| 910 | case GET_PORT_STATUS: |
| 911 | if (!w_value && w_length == 1 && |
| 912 | (USB_DIR_IN & ctrl->bRequestType)) |
| 913 | break; |
| 914 | return false; |
| 915 | case SOFT_RESET: |
| 916 | if (!w_value && !w_length && |
Andrzej Pietrasiewicz | fbdecad | 2015-03-13 11:08:08 +0100 | [diff] [blame] | 917 | !(USB_DIR_IN & ctrl->bRequestType)) |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 918 | break; |
| 919 | /* fall through */ |
| 920 | default: |
| 921 | return false; |
| 922 | } |
| 923 | return w_index == dev->interface; |
| 924 | } |
| 925 | |
| 926 | /* |
| 927 | * The setup() callback implements all the ep0 functionality that's not |
| 928 | * handled lower down. |
| 929 | */ |
| 930 | static int printer_func_setup(struct usb_function *f, |
| 931 | const struct usb_ctrlrequest *ctrl) |
| 932 | { |
| 933 | struct printer_dev *dev = func_to_printer(f); |
| 934 | struct usb_composite_dev *cdev = f->config->cdev; |
| 935 | struct usb_request *req = cdev->req; |
| 936 | int value = -EOPNOTSUPP; |
| 937 | u16 wIndex = le16_to_cpu(ctrl->wIndex); |
| 938 | u16 wValue = le16_to_cpu(ctrl->wValue); |
| 939 | u16 wLength = le16_to_cpu(ctrl->wLength); |
| 940 | |
| 941 | DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n", |
| 942 | ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength); |
| 943 | |
| 944 | switch (ctrl->bRequestType&USB_TYPE_MASK) { |
| 945 | case USB_TYPE_CLASS: |
| 946 | switch (ctrl->bRequest) { |
| 947 | case GET_DEVICE_ID: /* Get the IEEE-1284 PNP String */ |
| 948 | /* Only one printer interface is supported. */ |
| 949 | if ((wIndex>>8) != dev->interface) |
| 950 | break; |
| 951 | |
| 952 | value = (dev->pnp_string[0] << 8) | dev->pnp_string[1]; |
| 953 | memcpy(req->buf, dev->pnp_string, value); |
| 954 | DBG(dev, "1284 PNP String: %x %s\n", value, |
| 955 | &dev->pnp_string[2]); |
| 956 | break; |
| 957 | |
| 958 | case GET_PORT_STATUS: /* Get Port Status */ |
| 959 | /* Only one printer interface is supported. */ |
| 960 | if (wIndex != dev->interface) |
| 961 | break; |
| 962 | |
| 963 | *(u8 *)req->buf = dev->printer_status; |
| 964 | value = min_t(u16, wLength, 1); |
| 965 | break; |
| 966 | |
| 967 | case SOFT_RESET: /* Soft Reset */ |
| 968 | /* Only one printer interface is supported. */ |
| 969 | if (wIndex != dev->interface) |
| 970 | break; |
| 971 | |
| 972 | printer_soft_reset(dev); |
| 973 | |
| 974 | value = 0; |
| 975 | break; |
| 976 | |
| 977 | default: |
| 978 | goto unknown; |
| 979 | } |
| 980 | break; |
| 981 | |
| 982 | default: |
| 983 | unknown: |
| 984 | VDBG(dev, |
| 985 | "unknown ctrl req%02x.%02x v%04x i%04x l%d\n", |
| 986 | ctrl->bRequestType, ctrl->bRequest, |
| 987 | wValue, wIndex, wLength); |
| 988 | break; |
| 989 | } |
| 990 | /* host either stalls (value < 0) or reports success */ |
| 991 | if (value >= 0) { |
| 992 | req->length = value; |
| 993 | req->zero = value < wLength; |
| 994 | value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); |
| 995 | if (value < 0) { |
| 996 | ERROR(dev, "%s:%d Error!\n", __func__, __LINE__); |
| 997 | req->status = 0; |
| 998 | } |
| 999 | } |
| 1000 | return value; |
| 1001 | } |
| 1002 | |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1003 | static int printer_func_bind(struct usb_configuration *c, |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 1004 | struct usb_function *f) |
| 1005 | { |
| 1006 | struct usb_gadget *gadget = c->cdev->gadget; |
| 1007 | struct printer_dev *dev = func_to_printer(f); |
| 1008 | struct device *pdev; |
| 1009 | struct usb_composite_dev *cdev = c->cdev; |
| 1010 | struct usb_ep *in_ep; |
| 1011 | struct usb_ep *out_ep = NULL; |
| 1012 | struct usb_request *req; |
| 1013 | dev_t devt; |
| 1014 | int id; |
| 1015 | int ret; |
| 1016 | u32 i; |
| 1017 | |
| 1018 | id = usb_interface_id(c, f); |
| 1019 | if (id < 0) |
| 1020 | return id; |
| 1021 | intf_desc.bInterfaceNumber = id; |
| 1022 | |
| 1023 | /* finish hookup to lower layer ... */ |
| 1024 | dev->gadget = gadget; |
| 1025 | |
| 1026 | /* all we really need is bulk IN/OUT */ |
| 1027 | in_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_in_desc); |
| 1028 | if (!in_ep) { |
| 1029 | autoconf_fail: |
| 1030 | dev_err(&cdev->gadget->dev, "can't autoconfigure on %s\n", |
| 1031 | cdev->gadget->name); |
| 1032 | return -ENODEV; |
| 1033 | } |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 1034 | |
| 1035 | out_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_out_desc); |
| 1036 | if (!out_ep) |
| 1037 | goto autoconf_fail; |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 1038 | |
| 1039 | /* assumes that all endpoints are dual-speed */ |
| 1040 | hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress; |
| 1041 | hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress; |
| 1042 | ss_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress; |
| 1043 | ss_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress; |
| 1044 | |
| 1045 | ret = usb_assign_descriptors(f, fs_printer_function, |
John Youn | eaef50c | 2016-02-05 17:06:07 -0800 | [diff] [blame] | 1046 | hs_printer_function, ss_printer_function, NULL); |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 1047 | if (ret) |
| 1048 | return ret; |
| 1049 | |
| 1050 | dev->in_ep = in_ep; |
| 1051 | dev->out_ep = out_ep; |
| 1052 | |
| 1053 | ret = -ENOMEM; |
| 1054 | for (i = 0; i < dev->q_len; i++) { |
| 1055 | req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL); |
| 1056 | if (!req) |
| 1057 | goto fail_tx_reqs; |
| 1058 | list_add(&req->list, &dev->tx_reqs); |
| 1059 | } |
| 1060 | |
| 1061 | for (i = 0; i < dev->q_len; i++) { |
| 1062 | req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL); |
| 1063 | if (!req) |
| 1064 | goto fail_rx_reqs; |
| 1065 | list_add(&req->list, &dev->rx_reqs); |
| 1066 | } |
| 1067 | |
| 1068 | /* Setup the sysfs files for the printer gadget. */ |
| 1069 | devt = MKDEV(major, dev->minor); |
| 1070 | pdev = device_create(usb_gadget_class, NULL, devt, |
| 1071 | NULL, "g_printer%d", dev->minor); |
| 1072 | if (IS_ERR(pdev)) { |
| 1073 | ERROR(dev, "Failed to create device: g_printer\n"); |
| 1074 | ret = PTR_ERR(pdev); |
| 1075 | goto fail_rx_reqs; |
| 1076 | } |
| 1077 | |
| 1078 | /* |
| 1079 | * Register a character device as an interface to a user mode |
| 1080 | * program that handles the printer specific functionality. |
| 1081 | */ |
| 1082 | cdev_init(&dev->printer_cdev, &printer_io_operations); |
| 1083 | dev->printer_cdev.owner = THIS_MODULE; |
| 1084 | ret = cdev_add(&dev->printer_cdev, devt, 1); |
| 1085 | if (ret) { |
| 1086 | ERROR(dev, "Failed to open char device\n"); |
| 1087 | goto fail_cdev_add; |
| 1088 | } |
| 1089 | |
| 1090 | return 0; |
| 1091 | |
| 1092 | fail_cdev_add: |
| 1093 | device_destroy(usb_gadget_class, devt); |
| 1094 | |
| 1095 | fail_rx_reqs: |
| 1096 | while (!list_empty(&dev->rx_reqs)) { |
| 1097 | req = container_of(dev->rx_reqs.next, struct usb_request, list); |
| 1098 | list_del(&req->list); |
| 1099 | printer_req_free(dev->out_ep, req); |
| 1100 | } |
| 1101 | |
| 1102 | fail_tx_reqs: |
| 1103 | while (!list_empty(&dev->tx_reqs)) { |
| 1104 | req = container_of(dev->tx_reqs.next, struct usb_request, list); |
| 1105 | list_del(&req->list); |
| 1106 | printer_req_free(dev->in_ep, req); |
| 1107 | } |
| 1108 | |
| 1109 | return ret; |
| 1110 | |
| 1111 | } |
| 1112 | |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 1113 | static int printer_func_set_alt(struct usb_function *f, |
| 1114 | unsigned intf, unsigned alt) |
| 1115 | { |
| 1116 | struct printer_dev *dev = func_to_printer(f); |
| 1117 | int ret = -ENOTSUPP; |
| 1118 | |
| 1119 | if (!alt) |
| 1120 | ret = set_interface(dev, intf); |
| 1121 | |
| 1122 | return ret; |
| 1123 | } |
| 1124 | |
| 1125 | static void printer_func_disable(struct usb_function *f) |
| 1126 | { |
| 1127 | struct printer_dev *dev = func_to_printer(f); |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 1128 | |
| 1129 | DBG(dev, "%s\n", __func__); |
| 1130 | |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 1131 | printer_reset_interface(dev); |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 1132 | } |
| 1133 | |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1134 | static inline struct f_printer_opts |
| 1135 | *to_f_printer_opts(struct config_item *item) |
| 1136 | { |
| 1137 | return container_of(to_config_group(item), struct f_printer_opts, |
| 1138 | func_inst.group); |
| 1139 | } |
| 1140 | |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1141 | static void printer_attr_release(struct config_item *item) |
| 1142 | { |
| 1143 | struct f_printer_opts *opts = to_f_printer_opts(item); |
| 1144 | |
| 1145 | usb_put_function_instance(&opts->func_inst); |
| 1146 | } |
| 1147 | |
| 1148 | static struct configfs_item_operations printer_item_ops = { |
| 1149 | .release = printer_attr_release, |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1150 | }; |
| 1151 | |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1152 | static ssize_t f_printer_opts_pnp_string_show(struct config_item *item, |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1153 | char *page) |
| 1154 | { |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1155 | struct f_printer_opts *opts = to_f_printer_opts(item); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1156 | int result; |
| 1157 | |
| 1158 | mutex_lock(&opts->lock); |
| 1159 | result = strlcpy(page, opts->pnp_string + 2, PNP_STRING_LEN - 2); |
| 1160 | mutex_unlock(&opts->lock); |
| 1161 | |
| 1162 | return result; |
| 1163 | } |
| 1164 | |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1165 | static ssize_t f_printer_opts_pnp_string_store(struct config_item *item, |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1166 | const char *page, size_t len) |
| 1167 | { |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1168 | struct f_printer_opts *opts = to_f_printer_opts(item); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1169 | int result, l; |
| 1170 | |
| 1171 | mutex_lock(&opts->lock); |
| 1172 | result = strlcpy(opts->pnp_string + 2, page, PNP_STRING_LEN - 2); |
| 1173 | l = strlen(opts->pnp_string + 2) + 2; |
| 1174 | opts->pnp_string[0] = (l >> 8) & 0xFF; |
| 1175 | opts->pnp_string[1] = l & 0xFF; |
| 1176 | mutex_unlock(&opts->lock); |
| 1177 | |
| 1178 | return result; |
| 1179 | } |
| 1180 | |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1181 | CONFIGFS_ATTR(f_printer_opts_, pnp_string); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1182 | |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1183 | static ssize_t f_printer_opts_q_len_show(struct config_item *item, |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1184 | char *page) |
| 1185 | { |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1186 | struct f_printer_opts *opts = to_f_printer_opts(item); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1187 | int result; |
| 1188 | |
| 1189 | mutex_lock(&opts->lock); |
| 1190 | result = sprintf(page, "%d\n", opts->q_len); |
| 1191 | mutex_unlock(&opts->lock); |
| 1192 | |
| 1193 | return result; |
| 1194 | } |
| 1195 | |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1196 | static ssize_t f_printer_opts_q_len_store(struct config_item *item, |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1197 | const char *page, size_t len) |
| 1198 | { |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1199 | struct f_printer_opts *opts = to_f_printer_opts(item); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1200 | int ret; |
| 1201 | u16 num; |
| 1202 | |
| 1203 | mutex_lock(&opts->lock); |
| 1204 | if (opts->refcnt) { |
| 1205 | ret = -EBUSY; |
| 1206 | goto end; |
| 1207 | } |
| 1208 | |
| 1209 | ret = kstrtou16(page, 0, &num); |
| 1210 | if (ret) |
| 1211 | goto end; |
| 1212 | |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1213 | opts->q_len = (unsigned)num; |
| 1214 | ret = len; |
| 1215 | end: |
| 1216 | mutex_unlock(&opts->lock); |
| 1217 | return ret; |
| 1218 | } |
| 1219 | |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1220 | CONFIGFS_ATTR(f_printer_opts_, q_len); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1221 | |
| 1222 | static struct configfs_attribute *printer_attrs[] = { |
Christoph Hellwig | aa48a41 | 2015-10-03 15:32:45 +0200 | [diff] [blame] | 1223 | &f_printer_opts_attr_pnp_string, |
| 1224 | &f_printer_opts_attr_q_len, |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1225 | NULL, |
| 1226 | }; |
| 1227 | |
| 1228 | static struct config_item_type printer_func_type = { |
| 1229 | .ct_item_ops = &printer_item_ops, |
| 1230 | .ct_attrs = printer_attrs, |
| 1231 | .ct_owner = THIS_MODULE, |
| 1232 | }; |
| 1233 | |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1234 | static inline int gprinter_get_minor(void) |
| 1235 | { |
Andrzej Pietrasiewicz | 4248bd7 | 2015-07-24 09:48:41 +0200 | [diff] [blame] | 1236 | int ret; |
| 1237 | |
| 1238 | ret = ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL); |
| 1239 | if (ret >= PRINTER_MINORS) { |
| 1240 | ida_simple_remove(&printer_ida, ret); |
| 1241 | ret = -ENODEV; |
| 1242 | } |
| 1243 | |
| 1244 | return ret; |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1245 | } |
| 1246 | |
| 1247 | static inline void gprinter_put_minor(int minor) |
| 1248 | { |
| 1249 | ida_simple_remove(&printer_ida, minor); |
| 1250 | } |
| 1251 | |
| 1252 | static int gprinter_setup(int); |
| 1253 | static void gprinter_cleanup(void); |
| 1254 | |
| 1255 | static void gprinter_free_inst(struct usb_function_instance *f) |
| 1256 | { |
| 1257 | struct f_printer_opts *opts; |
| 1258 | |
| 1259 | opts = container_of(f, struct f_printer_opts, func_inst); |
| 1260 | |
| 1261 | mutex_lock(&printer_ida_lock); |
| 1262 | |
| 1263 | gprinter_put_minor(opts->minor); |
| 1264 | if (idr_is_empty(&printer_ida.idr)) |
| 1265 | gprinter_cleanup(); |
| 1266 | |
| 1267 | mutex_unlock(&printer_ida_lock); |
| 1268 | |
| 1269 | kfree(opts); |
| 1270 | } |
| 1271 | |
| 1272 | static struct usb_function_instance *gprinter_alloc_inst(void) |
| 1273 | { |
| 1274 | struct f_printer_opts *opts; |
| 1275 | struct usb_function_instance *ret; |
| 1276 | int status = 0; |
| 1277 | |
| 1278 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); |
| 1279 | if (!opts) |
| 1280 | return ERR_PTR(-ENOMEM); |
| 1281 | |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1282 | mutex_init(&opts->lock); |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1283 | opts->func_inst.free_func_inst = gprinter_free_inst; |
| 1284 | ret = &opts->func_inst; |
| 1285 | |
| 1286 | mutex_lock(&printer_ida_lock); |
| 1287 | |
| 1288 | if (idr_is_empty(&printer_ida.idr)) { |
| 1289 | status = gprinter_setup(PRINTER_MINORS); |
| 1290 | if (status) { |
| 1291 | ret = ERR_PTR(status); |
| 1292 | kfree(opts); |
| 1293 | goto unlock; |
| 1294 | } |
| 1295 | } |
| 1296 | |
| 1297 | opts->minor = gprinter_get_minor(); |
| 1298 | if (opts->minor < 0) { |
| 1299 | ret = ERR_PTR(opts->minor); |
| 1300 | kfree(opts); |
| 1301 | if (idr_is_empty(&printer_ida.idr)) |
| 1302 | gprinter_cleanup(); |
Dan Carpenter | 2bb2077 | 2015-03-13 12:11:42 +0300 | [diff] [blame] | 1303 | goto unlock; |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1304 | } |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1305 | config_group_init_type_name(&opts->func_inst.group, "", |
| 1306 | &printer_func_type); |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1307 | |
| 1308 | unlock: |
| 1309 | mutex_unlock(&printer_ida_lock); |
| 1310 | return ret; |
| 1311 | } |
| 1312 | |
| 1313 | static void gprinter_free(struct usb_function *f) |
| 1314 | { |
| 1315 | struct printer_dev *dev = func_to_printer(f); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1316 | struct f_printer_opts *opts; |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1317 | |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1318 | opts = container_of(f->fi, struct f_printer_opts, func_inst); |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1319 | kfree(dev); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1320 | mutex_lock(&opts->lock); |
| 1321 | --opts->refcnt; |
| 1322 | mutex_unlock(&opts->lock); |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1323 | } |
| 1324 | |
| 1325 | static void printer_func_unbind(struct usb_configuration *c, |
| 1326 | struct usb_function *f) |
| 1327 | { |
| 1328 | struct printer_dev *dev; |
| 1329 | struct usb_request *req; |
| 1330 | |
| 1331 | dev = func_to_printer(f); |
| 1332 | |
| 1333 | device_destroy(usb_gadget_class, MKDEV(major, dev->minor)); |
| 1334 | |
| 1335 | /* Remove Character Device */ |
| 1336 | cdev_del(&dev->printer_cdev); |
| 1337 | |
| 1338 | /* we must already have been disconnected ... no i/o may be active */ |
| 1339 | WARN_ON(!list_empty(&dev->tx_reqs_active)); |
| 1340 | WARN_ON(!list_empty(&dev->rx_reqs_active)); |
| 1341 | |
| 1342 | /* Free all memory for this driver. */ |
| 1343 | while (!list_empty(&dev->tx_reqs)) { |
| 1344 | req = container_of(dev->tx_reqs.next, struct usb_request, |
| 1345 | list); |
| 1346 | list_del(&req->list); |
| 1347 | printer_req_free(dev->in_ep, req); |
| 1348 | } |
| 1349 | |
| 1350 | if (dev->current_rx_req != NULL) |
| 1351 | printer_req_free(dev->out_ep, dev->current_rx_req); |
| 1352 | |
| 1353 | while (!list_empty(&dev->rx_reqs)) { |
| 1354 | req = container_of(dev->rx_reqs.next, |
| 1355 | struct usb_request, list); |
| 1356 | list_del(&req->list); |
| 1357 | printer_req_free(dev->out_ep, req); |
| 1358 | } |
| 1359 | |
| 1360 | while (!list_empty(&dev->rx_buffers)) { |
| 1361 | req = container_of(dev->rx_buffers.next, |
| 1362 | struct usb_request, list); |
| 1363 | list_del(&req->list); |
| 1364 | printer_req_free(dev->out_ep, req); |
| 1365 | } |
| 1366 | usb_free_all_descriptors(f); |
| 1367 | } |
| 1368 | |
| 1369 | static struct usb_function *gprinter_alloc(struct usb_function_instance *fi) |
| 1370 | { |
| 1371 | struct printer_dev *dev; |
| 1372 | struct f_printer_opts *opts; |
| 1373 | |
| 1374 | opts = container_of(fi, struct f_printer_opts, func_inst); |
| 1375 | |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1376 | mutex_lock(&opts->lock); |
| 1377 | if (opts->minor >= minors) { |
| 1378 | mutex_unlock(&opts->lock); |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1379 | return ERR_PTR(-ENOENT); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1380 | } |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1381 | |
| 1382 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1383 | if (!dev) { |
| 1384 | mutex_unlock(&opts->lock); |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1385 | return ERR_PTR(-ENOMEM); |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1386 | } |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1387 | |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1388 | ++opts->refcnt; |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1389 | dev->minor = opts->minor; |
| 1390 | dev->pnp_string = opts->pnp_string; |
| 1391 | dev->q_len = opts->q_len; |
Andrzej Pietrasiewicz | ee1cd51 | 2015-03-03 10:52:32 +0100 | [diff] [blame] | 1392 | mutex_unlock(&opts->lock); |
Andrzej Pietrasiewicz | b26394b | 2015-03-03 10:52:28 +0100 | [diff] [blame] | 1393 | |
| 1394 | dev->function.name = "printer"; |
| 1395 | dev->function.bind = printer_func_bind; |
| 1396 | dev->function.setup = printer_func_setup; |
| 1397 | dev->function.unbind = printer_func_unbind; |
| 1398 | dev->function.set_alt = printer_func_set_alt; |
| 1399 | dev->function.disable = printer_func_disable; |
| 1400 | dev->function.req_match = gprinter_req_match; |
| 1401 | dev->function.free_func = gprinter_free; |
| 1402 | |
| 1403 | INIT_LIST_HEAD(&dev->tx_reqs); |
| 1404 | INIT_LIST_HEAD(&dev->rx_reqs); |
| 1405 | INIT_LIST_HEAD(&dev->rx_buffers); |
| 1406 | INIT_LIST_HEAD(&dev->tx_reqs_active); |
| 1407 | INIT_LIST_HEAD(&dev->rx_reqs_active); |
| 1408 | |
| 1409 | spin_lock_init(&dev->lock); |
| 1410 | mutex_init(&dev->lock_printer_io); |
| 1411 | init_waitqueue_head(&dev->rx_wait); |
| 1412 | init_waitqueue_head(&dev->tx_wait); |
| 1413 | init_waitqueue_head(&dev->tx_flush_wait); |
| 1414 | |
| 1415 | dev->interface = -1; |
| 1416 | dev->printer_cdev_open = 0; |
| 1417 | dev->printer_status = PRINTER_NOT_ERROR; |
| 1418 | dev->current_rx_req = NULL; |
| 1419 | dev->current_rx_bytes = 0; |
| 1420 | dev->current_rx_buf = NULL; |
| 1421 | |
| 1422 | return &dev->function; |
| 1423 | } |
| 1424 | |
| 1425 | DECLARE_USB_FUNCTION_INIT(printer, gprinter_alloc_inst, gprinter_alloc); |
| 1426 | MODULE_LICENSE("GPL"); |
| 1427 | MODULE_AUTHOR("Craig Nadler"); |
| 1428 | |
Andrzej Pietrasiewicz | b185f01 | 2015-03-03 10:52:27 +0100 | [diff] [blame] | 1429 | static int gprinter_setup(int count) |
| 1430 | { |
| 1431 | int status; |
| 1432 | dev_t devt; |
| 1433 | |
| 1434 | usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget"); |
| 1435 | if (IS_ERR(usb_gadget_class)) { |
| 1436 | status = PTR_ERR(usb_gadget_class); |
| 1437 | usb_gadget_class = NULL; |
| 1438 | pr_err("unable to create usb_gadget class %d\n", status); |
| 1439 | return status; |
| 1440 | } |
| 1441 | |
| 1442 | status = alloc_chrdev_region(&devt, 0, count, "USB printer gadget"); |
| 1443 | if (status) { |
| 1444 | pr_err("alloc_chrdev_region %d\n", status); |
| 1445 | class_destroy(usb_gadget_class); |
| 1446 | usb_gadget_class = NULL; |
| 1447 | return status; |
| 1448 | } |
| 1449 | |
| 1450 | major = MAJOR(devt); |
| 1451 | minors = count; |
| 1452 | |
| 1453 | return status; |
| 1454 | } |
| 1455 | |
| 1456 | static void gprinter_cleanup(void) |
| 1457 | { |
| 1458 | if (major) { |
| 1459 | unregister_chrdev_region(MKDEV(major, 0), minors); |
| 1460 | major = minors = 0; |
| 1461 | } |
| 1462 | class_destroy(usb_gadget_class); |
| 1463 | usb_gadget_class = NULL; |
| 1464 | } |