1 /* 2 * Driver for Meywa-Denki & KAYAC YUREX 3 * 4 * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation, version 2. 9 * 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/errno.h> 14 #include <linux/init.h> 15 #include <linux/slab.h> 16 #include <linux/module.h> 17 #include <linux/kref.h> 18 #include <linux/mutex.h> 19 #include <linux/uaccess.h> 20 #include <linux/usb.h> 21 #include <linux/hid.h> 22 23 #define DRIVER_AUTHOR "Tomoki Sekiyama" 24 #define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX" 25 26 #define YUREX_VENDOR_ID 0x0c45 27 #define YUREX_PRODUCT_ID 0x1010 28 29 #define CMD_ACK '!' 30 #define CMD_ANIMATE 'A' 31 #define CMD_COUNT 'C' 32 #define CMD_LED 'L' 33 #define CMD_READ 'R' 34 #define CMD_SET 'S' 35 #define CMD_VERSION 'V' 36 #define CMD_EOF 0x0d 37 #define CMD_PADDING 0xff 38 39 #define YUREX_BUF_SIZE 8 40 #define YUREX_WRITE_TIMEOUT (HZ*2) 41 42 /* table of devices that work with this driver */ 43 static struct usb_device_id yurex_table[] = { 44 { USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) }, 45 { } /* Terminating entry */ 46 }; 47 MODULE_DEVICE_TABLE(usb, yurex_table); 48 49 #ifdef CONFIG_USB_DYNAMIC_MINORS 50 #define YUREX_MINOR_BASE 0 51 #else 52 #define YUREX_MINOR_BASE 192 53 #endif 54 55 /* Structure to hold all of our device specific stuff */ 56 struct usb_yurex { 57 struct usb_device *udev; 58 struct usb_interface *interface; 59 __u8 int_in_endpointAddr; 60 struct urb *urb; /* URB for interrupt in */ 61 unsigned char *int_buffer; /* buffer for intterupt in */ 62 struct urb *cntl_urb; /* URB for control msg */ 63 struct usb_ctrlrequest *cntl_req; /* req for control msg */ 64 unsigned char *cntl_buffer; /* buffer for control msg */ 65 66 struct kref kref; 67 struct mutex io_mutex; 68 struct fasync_struct *async_queue; 69 wait_queue_head_t waitq; 70 71 spinlock_t lock; 72 __s64 bbu; /* BBU from device */ 73 }; 74 #define to_yurex_dev(d) container_of(d, struct usb_yurex, kref) 75 76 static struct usb_driver yurex_driver; 77 static const struct file_operations yurex_fops; 78 79 80 static void yurex_control_callback(struct urb *urb) 81 { 82 struct usb_yurex *dev = urb->context; 83 int status = urb->status; 84 85 if (status) { 86 dev_err(&urb->dev->dev, "%s - control failed: %d\n", 87 __func__, status); 88 wake_up_interruptible(&dev->waitq); 89 return; 90 } 91 /* on success, sender woken up by CMD_ACK int in, or timeout */ 92 } 93 94 static void yurex_delete(struct kref *kref) 95 { 96 struct usb_yurex *dev = to_yurex_dev(kref); 97 98 dev_dbg(&dev->interface->dev, "%s\n", __func__); 99 100 usb_put_dev(dev->udev); 101 if (dev->cntl_urb) { 102 usb_kill_urb(dev->cntl_urb); 103 kfree(dev->cntl_req); 104 if (dev->cntl_buffer) 105 usb_free_coherent(dev->udev, YUREX_BUF_SIZE, 106 dev->cntl_buffer, dev->cntl_urb->transfer_dma); 107 usb_free_urb(dev->cntl_urb); 108 } 109 if (dev->urb) { 110 usb_kill_urb(dev->urb); 111 if (dev->int_buffer) 112 usb_free_coherent(dev->udev, YUREX_BUF_SIZE, 113 dev->int_buffer, dev->urb->transfer_dma); 114 usb_free_urb(dev->urb); 115 } 116 kfree(dev); 117 } 118 119 /* 120 * usb class driver info in order to get a minor number from the usb core, 121 * and to have the device registered with the driver core 122 */ 123 static struct usb_class_driver yurex_class = { 124 .name = "yurex%d", 125 .fops = &yurex_fops, 126 .minor_base = YUREX_MINOR_BASE, 127 }; 128 129 static void yurex_interrupt(struct urb *urb) 130 { 131 struct usb_yurex *dev = urb->context; 132 unsigned char *buf = dev->int_buffer; 133 int status = urb->status; 134 unsigned long flags; 135 int retval, i; 136 137 switch (status) { 138 case 0: /*success*/ 139 break; 140 case -EOVERFLOW: 141 dev_err(&dev->interface->dev, 142 "%s - overflow with length %d, actual length is %d\n", 143 __func__, YUREX_BUF_SIZE, dev->urb->actual_length); 144 case -ECONNRESET: 145 case -ENOENT: 146 case -ESHUTDOWN: 147 case -EILSEQ: 148 /* The device is terminated, clean up */ 149 return; 150 default: 151 dev_err(&dev->interface->dev, 152 "%s - unknown status received: %d\n", __func__, status); 153 goto exit; 154 } 155 156 /* handle received message */ 157 switch (buf[0]) { 158 case CMD_COUNT: 159 case CMD_READ: 160 if (buf[6] == CMD_EOF) { 161 spin_lock_irqsave(&dev->lock, flags); 162 dev->bbu = 0; 163 for (i = 1; i < 6; i++) { 164 dev->bbu += buf[i]; 165 if (i != 5) 166 dev->bbu <<= 8; 167 } 168 dev_dbg(&dev->interface->dev, "%s count: %lld\n", 169 __func__, dev->bbu); 170 spin_unlock_irqrestore(&dev->lock, flags); 171 172 kill_fasync(&dev->async_queue, SIGIO, POLL_IN); 173 } 174 else 175 dev_dbg(&dev->interface->dev, 176 "data format error - no EOF\n"); 177 break; 178 case CMD_ACK: 179 dev_dbg(&dev->interface->dev, "%s ack: %c\n", 180 __func__, buf[1]); 181 wake_up_interruptible(&dev->waitq); 182 break; 183 } 184 185 exit: 186 retval = usb_submit_urb(dev->urb, GFP_ATOMIC); 187 if (retval) { 188 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n", 189 __func__, retval); 190 } 191 } 192 193 static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id) 194 { 195 struct usb_yurex *dev; 196 struct usb_host_interface *iface_desc; 197 struct usb_endpoint_descriptor *endpoint; 198 int retval = -ENOMEM; 199 int i; 200 DEFINE_WAIT(wait); 201 202 /* allocate memory for our device state and initialize it */ 203 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 204 if (!dev) { 205 dev_err(&interface->dev, "Out of memory\n"); 206 goto error; 207 } 208 kref_init(&dev->kref); 209 mutex_init(&dev->io_mutex); 210 spin_lock_init(&dev->lock); 211 init_waitqueue_head(&dev->waitq); 212 213 dev->udev = usb_get_dev(interface_to_usbdev(interface)); 214 dev->interface = interface; 215 216 /* set up the endpoint information */ 217 iface_desc = interface->cur_altsetting; 218 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) { 219 endpoint = &iface_desc->endpoint[i].desc; 220 221 if (usb_endpoint_is_int_in(endpoint)) { 222 dev->int_in_endpointAddr = endpoint->bEndpointAddress; 223 break; 224 } 225 } 226 if (!dev->int_in_endpointAddr) { 227 retval = -ENODEV; 228 dev_err(&interface->dev, "Could not find endpoints\n"); 229 goto error; 230 } 231 232 233 /* allocate control URB */ 234 dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL); 235 if (!dev->cntl_urb) { 236 dev_err(&interface->dev, "Could not allocate control URB\n"); 237 goto error; 238 } 239 240 /* allocate buffer for control req */ 241 dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL); 242 if (!dev->cntl_req) { 243 dev_err(&interface->dev, "Could not allocate cntl_req\n"); 244 goto error; 245 } 246 247 /* allocate buffer for control msg */ 248 dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE, 249 GFP_KERNEL, 250 &dev->cntl_urb->transfer_dma); 251 if (!dev->cntl_buffer) { 252 dev_err(&interface->dev, "Could not allocate cntl_buffer\n"); 253 goto error; 254 } 255 256 /* configure control URB */ 257 dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS | 258 USB_RECIP_INTERFACE; 259 dev->cntl_req->bRequest = HID_REQ_SET_REPORT; 260 dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8); 261 dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber); 262 dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE); 263 264 usb_fill_control_urb(dev->cntl_urb, dev->udev, 265 usb_sndctrlpipe(dev->udev, 0), 266 (void *)dev->cntl_req, dev->cntl_buffer, 267 YUREX_BUF_SIZE, yurex_control_callback, dev); 268 dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 269 270 271 /* allocate interrupt URB */ 272 dev->urb = usb_alloc_urb(0, GFP_KERNEL); 273 if (!dev->urb) { 274 dev_err(&interface->dev, "Could not allocate URB\n"); 275 goto error; 276 } 277 278 /* allocate buffer for interrupt in */ 279 dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE, 280 GFP_KERNEL, &dev->urb->transfer_dma); 281 if (!dev->int_buffer) { 282 dev_err(&interface->dev, "Could not allocate int_buffer\n"); 283 goto error; 284 } 285 286 /* configure interrupt URB */ 287 usb_fill_int_urb(dev->urb, dev->udev, 288 usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr), 289 dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt, 290 dev, 1); 291 dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 292 if (usb_submit_urb(dev->urb, GFP_KERNEL)) { 293 retval = -EIO; 294 dev_err(&interface->dev, "Could not submitting URB\n"); 295 goto error; 296 } 297 298 /* save our data pointer in this interface device */ 299 usb_set_intfdata(interface, dev); 300 301 /* we can register the device now, as it is ready */ 302 retval = usb_register_dev(interface, &yurex_class); 303 if (retval) { 304 dev_err(&interface->dev, 305 "Not able to get a minor for this device.\n"); 306 usb_set_intfdata(interface, NULL); 307 goto error; 308 } 309 310 dev->bbu = -1; 311 312 dev_info(&interface->dev, 313 "USB YUREX device now attached to Yurex #%d\n", 314 interface->minor); 315 316 return 0; 317 318 error: 319 if (dev) 320 /* this frees allocated memory */ 321 kref_put(&dev->kref, yurex_delete); 322 return retval; 323 } 324 325 static void yurex_disconnect(struct usb_interface *interface) 326 { 327 struct usb_yurex *dev; 328 int minor = interface->minor; 329 330 dev = usb_get_intfdata(interface); 331 usb_set_intfdata(interface, NULL); 332 333 /* give back our minor */ 334 usb_deregister_dev(interface, &yurex_class); 335 336 /* prevent more I/O from starting */ 337 mutex_lock(&dev->io_mutex); 338 dev->interface = NULL; 339 mutex_unlock(&dev->io_mutex); 340 341 /* wakeup waiters */ 342 kill_fasync(&dev->async_queue, SIGIO, POLL_IN); 343 wake_up_interruptible(&dev->waitq); 344 345 /* decrement our usage count */ 346 kref_put(&dev->kref, yurex_delete); 347 348 dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor); 349 } 350 351 static struct usb_driver yurex_driver = { 352 .name = "yurex", 353 .probe = yurex_probe, 354 .disconnect = yurex_disconnect, 355 .id_table = yurex_table, 356 }; 357 358 359 static int yurex_fasync(int fd, struct file *file, int on) 360 { 361 struct usb_yurex *dev; 362 363 dev = (struct usb_yurex *)file->private_data; 364 return fasync_helper(fd, file, on, &dev->async_queue); 365 } 366 367 static int yurex_open(struct inode *inode, struct file *file) 368 { 369 struct usb_yurex *dev; 370 struct usb_interface *interface; 371 int subminor; 372 int retval = 0; 373 374 subminor = iminor(inode); 375 376 interface = usb_find_interface(&yurex_driver, subminor); 377 if (!interface) { 378 printk(KERN_ERR "%s - error, can't find device for minor %d", 379 __func__, subminor); 380 retval = -ENODEV; 381 goto exit; 382 } 383 384 dev = usb_get_intfdata(interface); 385 if (!dev) { 386 retval = -ENODEV; 387 goto exit; 388 } 389 390 /* increment our usage count for the device */ 391 kref_get(&dev->kref); 392 393 /* save our object in the file's private structure */ 394 mutex_lock(&dev->io_mutex); 395 file->private_data = dev; 396 mutex_unlock(&dev->io_mutex); 397 398 exit: 399 return retval; 400 } 401 402 static int yurex_release(struct inode *inode, struct file *file) 403 { 404 struct usb_yurex *dev; 405 406 dev = (struct usb_yurex *)file->private_data; 407 if (dev == NULL) 408 return -ENODEV; 409 410 yurex_fasync(-1, file, 0); 411 412 /* decrement the count on our device */ 413 kref_put(&dev->kref, yurex_delete); 414 return 0; 415 } 416 417 static ssize_t yurex_read(struct file *file, char *buffer, size_t count, loff_t *ppos) 418 { 419 struct usb_yurex *dev; 420 int retval = 0; 421 int bytes_read = 0; 422 char in_buffer[20]; 423 unsigned long flags; 424 425 dev = (struct usb_yurex *)file->private_data; 426 427 mutex_lock(&dev->io_mutex); 428 if (!dev->interface) { /* already disconnected */ 429 retval = -ENODEV; 430 goto exit; 431 } 432 433 spin_lock_irqsave(&dev->lock, flags); 434 bytes_read = snprintf(in_buffer, 20, "%lld\n", dev->bbu); 435 spin_unlock_irqrestore(&dev->lock, flags); 436 437 if (*ppos < bytes_read) { 438 if (copy_to_user(buffer, in_buffer + *ppos, bytes_read - *ppos)) 439 retval = -EFAULT; 440 else { 441 retval = bytes_read - *ppos; 442 *ppos += bytes_read; 443 } 444 } 445 446 exit: 447 mutex_unlock(&dev->io_mutex); 448 return retval; 449 } 450 451 static ssize_t yurex_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos) 452 { 453 struct usb_yurex *dev; 454 int i, set = 0, retval = 0; 455 char buffer[16]; 456 char *data = buffer; 457 unsigned long long c, c2 = 0; 458 signed long timeout = 0; 459 DEFINE_WAIT(wait); 460 461 count = min(sizeof(buffer), count); 462 dev = (struct usb_yurex *)file->private_data; 463 464 /* verify that we actually have some data to write */ 465 if (count == 0) 466 goto error; 467 468 mutex_lock(&dev->io_mutex); 469 if (!dev->interface) { /* alreaday disconnected */ 470 mutex_unlock(&dev->io_mutex); 471 retval = -ENODEV; 472 goto error; 473 } 474 475 if (copy_from_user(buffer, user_buffer, count)) { 476 mutex_unlock(&dev->io_mutex); 477 retval = -EFAULT; 478 goto error; 479 } 480 memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE); 481 482 switch (buffer[0]) { 483 case CMD_ANIMATE: 484 case CMD_LED: 485 dev->cntl_buffer[0] = buffer[0]; 486 dev->cntl_buffer[1] = buffer[1]; 487 dev->cntl_buffer[2] = CMD_EOF; 488 break; 489 case CMD_READ: 490 case CMD_VERSION: 491 dev->cntl_buffer[0] = buffer[0]; 492 dev->cntl_buffer[1] = 0x00; 493 dev->cntl_buffer[2] = CMD_EOF; 494 break; 495 case CMD_SET: 496 data++; 497 /* FALL THROUGH */ 498 case '0' ... '9': 499 set = 1; 500 c = c2 = simple_strtoull(data, NULL, 0); 501 dev->cntl_buffer[0] = CMD_SET; 502 for (i = 1; i < 6; i++) { 503 dev->cntl_buffer[i] = (c>>32) & 0xff; 504 c <<= 8; 505 } 506 buffer[6] = CMD_EOF; 507 break; 508 default: 509 mutex_unlock(&dev->io_mutex); 510 return -EINVAL; 511 } 512 513 /* send the data as the control msg */ 514 prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE); 515 dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__, 516 dev->cntl_buffer[0]); 517 retval = usb_submit_urb(dev->cntl_urb, GFP_KERNEL); 518 if (retval >= 0) 519 timeout = schedule_timeout(YUREX_WRITE_TIMEOUT); 520 finish_wait(&dev->waitq, &wait); 521 522 mutex_unlock(&dev->io_mutex); 523 524 if (retval < 0) { 525 dev_err(&dev->interface->dev, 526 "%s - failed to send bulk msg, error %d\n", 527 __func__, retval); 528 goto error; 529 } 530 if (set && timeout) 531 dev->bbu = c2; 532 return timeout ? count : -EIO; 533 534 error: 535 return retval; 536 } 537 538 static const struct file_operations yurex_fops = { 539 .owner = THIS_MODULE, 540 .read = yurex_read, 541 .write = yurex_write, 542 .open = yurex_open, 543 .release = yurex_release, 544 .fasync = yurex_fasync, 545 .llseek = default_llseek, 546 }; 547 548 module_usb_driver(yurex_driver); 549 550 MODULE_LICENSE("GPL"); 551