Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 1 | /** |
| 2 | * drivers/usb/class/usbtmc.c - USB Test & Measurment class driver |
| 3 | * |
| 4 | * Copyright (C) 2007 Stefan Kopp, Gechingen, Germany |
| 5 | * Copyright (C) 2008 Novell, Inc. |
| 6 | * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version 2 |
| 11 | * of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * The GNU General Public License is available at |
| 19 | * http://www.gnu.org/copyleft/gpl.html. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/module.h> |
Ilpo Järvinen | 857cc4d | 2008-10-30 13:56:47 +0200 | [diff] [blame] | 24 | #include <linux/kernel.h> |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 25 | #include <linux/fs.h> |
| 26 | #include <linux/uaccess.h> |
| 27 | #include <linux/kref.h> |
| 28 | #include <linux/mutex.h> |
| 29 | #include <linux/usb.h> |
| 30 | #include <linux/usb/tmc.h> |
| 31 | |
| 32 | |
| 33 | #define USBTMC_MINOR_BASE 176 |
| 34 | |
| 35 | /* |
| 36 | * Size of driver internal IO buffer. Must be multiple of 4 and at least as |
| 37 | * large as wMaxPacketSize (which is usually 512 bytes). |
| 38 | */ |
| 39 | #define USBTMC_SIZE_IOBUFFER 2048 |
| 40 | |
| 41 | /* Default USB timeout (in milliseconds) */ |
| 42 | #define USBTMC_TIMEOUT 10 |
| 43 | |
| 44 | /* |
| 45 | * Maximum number of read cycles to empty bulk in endpoint during CLEAR and |
| 46 | * ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short |
| 47 | * packet is never read. |
| 48 | */ |
| 49 | #define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100 |
| 50 | |
| 51 | static struct usb_device_id usbtmc_devices[] = { |
| 52 | { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), }, |
Greg Kroah-Hartman | 228dd05 | 2009-03-11 13:51:42 -0700 | [diff] [blame] | 53 | { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), }, |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 54 | { 0, } /* terminating entry */ |
| 55 | }; |
Greg Kroah-Hartman | 5413aa4 | 2008-12-03 16:33:09 -0800 | [diff] [blame] | 56 | MODULE_DEVICE_TABLE(usb, usbtmc_devices); |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 57 | |
| 58 | /* |
| 59 | * This structure is the capabilities for the device |
| 60 | * See section 4.2.1.8 of the USBTMC specification for details. |
| 61 | */ |
| 62 | struct usbtmc_dev_capabilities { |
| 63 | __u8 interface_capabilities; |
| 64 | __u8 device_capabilities; |
| 65 | __u8 usb488_interface_capabilities; |
| 66 | __u8 usb488_device_capabilities; |
| 67 | }; |
| 68 | |
| 69 | /* This structure holds private data for each USBTMC device. One copy is |
| 70 | * allocated for each USBTMC device in the driver's probe function. |
| 71 | */ |
| 72 | struct usbtmc_device_data { |
| 73 | const struct usb_device_id *id; |
| 74 | struct usb_device *usb_dev; |
| 75 | struct usb_interface *intf; |
| 76 | |
| 77 | unsigned int bulk_in; |
| 78 | unsigned int bulk_out; |
| 79 | |
| 80 | u8 bTag; |
| 81 | u8 bTag_last_write; /* needed for abort */ |
| 82 | u8 bTag_last_read; /* needed for abort */ |
| 83 | |
| 84 | /* attributes from the USB TMC spec for this device */ |
| 85 | u8 TermChar; |
| 86 | bool TermCharEnabled; |
| 87 | bool auto_abort; |
| 88 | |
| 89 | struct usbtmc_dev_capabilities capabilities; |
| 90 | struct kref kref; |
| 91 | struct mutex io_mutex; /* only one i/o function running at a time */ |
| 92 | }; |
| 93 | #define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref) |
| 94 | |
| 95 | /* Forward declarations */ |
| 96 | static struct usb_driver usbtmc_driver; |
| 97 | |
| 98 | static void usbtmc_delete(struct kref *kref) |
| 99 | { |
| 100 | struct usbtmc_device_data *data = to_usbtmc_data(kref); |
| 101 | |
| 102 | usb_put_dev(data->usb_dev); |
| 103 | kfree(data); |
| 104 | } |
| 105 | |
| 106 | static int usbtmc_open(struct inode *inode, struct file *filp) |
| 107 | { |
| 108 | struct usb_interface *intf; |
| 109 | struct usbtmc_device_data *data; |
Greg Kroah-Hartman | 5b10916 | 2009-03-10 20:42:55 -0700 | [diff] [blame] | 110 | int retval = 0; |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 111 | |
| 112 | intf = usb_find_interface(&usbtmc_driver, iminor(inode)); |
| 113 | if (!intf) { |
| 114 | printk(KERN_ERR KBUILD_MODNAME |
| 115 | ": can not find device for minor %d", iminor(inode)); |
Greg Kroah-Hartman | 5b10916 | 2009-03-10 20:42:55 -0700 | [diff] [blame] | 116 | retval = -ENODEV; |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 117 | goto exit; |
| 118 | } |
| 119 | |
| 120 | data = usb_get_intfdata(intf); |
| 121 | kref_get(&data->kref); |
| 122 | |
| 123 | /* Store pointer in file structure's private data field */ |
| 124 | filp->private_data = data; |
| 125 | |
| 126 | exit: |
| 127 | return retval; |
| 128 | } |
| 129 | |
| 130 | static int usbtmc_release(struct inode *inode, struct file *file) |
| 131 | { |
| 132 | struct usbtmc_device_data *data = file->private_data; |
| 133 | |
| 134 | kref_put(&data->kref, usbtmc_delete); |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data) |
| 139 | { |
Chris Malley | b361a6e | 2008-10-25 22:07:32 +0100 | [diff] [blame] | 140 | u8 *buffer; |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 141 | struct device *dev; |
| 142 | int rv; |
| 143 | int n; |
| 144 | int actual; |
| 145 | struct usb_host_interface *current_setting; |
| 146 | int max_size; |
| 147 | |
| 148 | dev = &data->intf->dev; |
| 149 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); |
| 150 | if (!buffer) |
| 151 | return -ENOMEM; |
| 152 | |
| 153 | rv = usb_control_msg(data->usb_dev, |
| 154 | usb_rcvctrlpipe(data->usb_dev, 0), |
| 155 | USBTMC_REQUEST_INITIATE_ABORT_BULK_IN, |
| 156 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, |
| 157 | data->bTag_last_read, data->bulk_in, |
| 158 | buffer, 2, USBTMC_TIMEOUT); |
| 159 | |
| 160 | if (rv < 0) { |
| 161 | dev_err(dev, "usb_control_msg returned %d\n", rv); |
| 162 | goto exit; |
| 163 | } |
| 164 | |
| 165 | dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); |
| 166 | |
| 167 | if (buffer[0] == USBTMC_STATUS_FAILED) { |
| 168 | rv = 0; |
| 169 | goto exit; |
| 170 | } |
| 171 | |
| 172 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| 173 | dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", |
| 174 | buffer[0]); |
| 175 | rv = -EPERM; |
| 176 | goto exit; |
| 177 | } |
| 178 | |
| 179 | max_size = 0; |
| 180 | current_setting = data->intf->cur_altsetting; |
| 181 | for (n = 0; n < current_setting->desc.bNumEndpoints; n++) |
| 182 | if (current_setting->endpoint[n].desc.bEndpointAddress == |
| 183 | data->bulk_in) |
| 184 | max_size = le16_to_cpu(current_setting->endpoint[n]. |
| 185 | desc.wMaxPacketSize); |
| 186 | |
| 187 | if (max_size == 0) { |
| 188 | dev_err(dev, "Couldn't get wMaxPacketSize\n"); |
| 189 | rv = -EPERM; |
| 190 | goto exit; |
| 191 | } |
| 192 | |
| 193 | dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size); |
| 194 | |
| 195 | n = 0; |
| 196 | |
| 197 | do { |
| 198 | dev_dbg(dev, "Reading from bulk in EP\n"); |
| 199 | |
| 200 | rv = usb_bulk_msg(data->usb_dev, |
| 201 | usb_rcvbulkpipe(data->usb_dev, |
| 202 | data->bulk_in), |
| 203 | buffer, USBTMC_SIZE_IOBUFFER, |
| 204 | &actual, USBTMC_TIMEOUT); |
| 205 | |
| 206 | n++; |
| 207 | |
| 208 | if (rv < 0) { |
| 209 | dev_err(dev, "usb_bulk_msg returned %d\n", rv); |
| 210 | goto exit; |
| 211 | } |
| 212 | } while ((actual == max_size) && |
| 213 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); |
| 214 | |
| 215 | if (actual == max_size) { |
| 216 | dev_err(dev, "Couldn't clear device buffer within %d cycles\n", |
| 217 | USBTMC_MAX_READS_TO_CLEAR_BULK_IN); |
| 218 | rv = -EPERM; |
| 219 | goto exit; |
| 220 | } |
| 221 | |
| 222 | n = 0; |
| 223 | |
| 224 | usbtmc_abort_bulk_in_status: |
| 225 | rv = usb_control_msg(data->usb_dev, |
| 226 | usb_rcvctrlpipe(data->usb_dev, 0), |
| 227 | USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS, |
| 228 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, |
| 229 | 0, data->bulk_in, buffer, 0x08, |
| 230 | USBTMC_TIMEOUT); |
| 231 | |
| 232 | if (rv < 0) { |
| 233 | dev_err(dev, "usb_control_msg returned %d\n", rv); |
| 234 | goto exit; |
| 235 | } |
| 236 | |
| 237 | dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); |
| 238 | |
| 239 | if (buffer[0] == USBTMC_STATUS_SUCCESS) { |
| 240 | rv = 0; |
| 241 | goto exit; |
| 242 | } |
| 243 | |
| 244 | if (buffer[0] != USBTMC_STATUS_PENDING) { |
| 245 | dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]); |
| 246 | rv = -EPERM; |
| 247 | goto exit; |
| 248 | } |
| 249 | |
| 250 | if (buffer[1] == 1) |
| 251 | do { |
| 252 | dev_dbg(dev, "Reading from bulk in EP\n"); |
| 253 | |
| 254 | rv = usb_bulk_msg(data->usb_dev, |
| 255 | usb_rcvbulkpipe(data->usb_dev, |
| 256 | data->bulk_in), |
| 257 | buffer, USBTMC_SIZE_IOBUFFER, |
| 258 | &actual, USBTMC_TIMEOUT); |
| 259 | |
| 260 | n++; |
| 261 | |
| 262 | if (rv < 0) { |
| 263 | dev_err(dev, "usb_bulk_msg returned %d\n", rv); |
| 264 | goto exit; |
| 265 | } |
| 266 | } while ((actual = max_size) && |
| 267 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); |
| 268 | |
| 269 | if (actual == max_size) { |
| 270 | dev_err(dev, "Couldn't clear device buffer within %d cycles\n", |
| 271 | USBTMC_MAX_READS_TO_CLEAR_BULK_IN); |
| 272 | rv = -EPERM; |
| 273 | goto exit; |
| 274 | } |
| 275 | |
| 276 | goto usbtmc_abort_bulk_in_status; |
| 277 | |
| 278 | exit: |
| 279 | kfree(buffer); |
| 280 | return rv; |
| 281 | |
| 282 | } |
| 283 | |
| 284 | static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data) |
| 285 | { |
| 286 | struct device *dev; |
| 287 | u8 *buffer; |
| 288 | int rv; |
| 289 | int n; |
| 290 | |
| 291 | dev = &data->intf->dev; |
| 292 | |
| 293 | buffer = kmalloc(8, GFP_KERNEL); |
| 294 | if (!buffer) |
| 295 | return -ENOMEM; |
| 296 | |
| 297 | rv = usb_control_msg(data->usb_dev, |
| 298 | usb_rcvctrlpipe(data->usb_dev, 0), |
| 299 | USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT, |
| 300 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, |
| 301 | data->bTag_last_write, data->bulk_out, |
| 302 | buffer, 2, USBTMC_TIMEOUT); |
| 303 | |
| 304 | if (rv < 0) { |
| 305 | dev_err(dev, "usb_control_msg returned %d\n", rv); |
| 306 | goto exit; |
| 307 | } |
| 308 | |
| 309 | dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]); |
| 310 | |
| 311 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| 312 | dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", |
| 313 | buffer[0]); |
| 314 | rv = -EPERM; |
| 315 | goto exit; |
| 316 | } |
| 317 | |
| 318 | n = 0; |
| 319 | |
| 320 | usbtmc_abort_bulk_out_check_status: |
| 321 | rv = usb_control_msg(data->usb_dev, |
| 322 | usb_rcvctrlpipe(data->usb_dev, 0), |
| 323 | USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS, |
| 324 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT, |
| 325 | 0, data->bulk_out, buffer, 0x08, |
| 326 | USBTMC_TIMEOUT); |
| 327 | n++; |
| 328 | if (rv < 0) { |
| 329 | dev_err(dev, "usb_control_msg returned %d\n", rv); |
| 330 | goto exit; |
| 331 | } |
| 332 | |
| 333 | dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]); |
| 334 | |
| 335 | if (buffer[0] == USBTMC_STATUS_SUCCESS) |
| 336 | goto usbtmc_abort_bulk_out_clear_halt; |
| 337 | |
| 338 | if ((buffer[0] == USBTMC_STATUS_PENDING) && |
| 339 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)) |
| 340 | goto usbtmc_abort_bulk_out_check_status; |
| 341 | |
| 342 | rv = -EPERM; |
| 343 | goto exit; |
| 344 | |
| 345 | usbtmc_abort_bulk_out_clear_halt: |
| 346 | rv = usb_control_msg(data->usb_dev, |
| 347 | usb_sndctrlpipe(data->usb_dev, 0), |
| 348 | USB_REQ_CLEAR_FEATURE, |
| 349 | USB_DIR_OUT | USB_TYPE_STANDARD | |
| 350 | USB_RECIP_ENDPOINT, |
| 351 | USB_ENDPOINT_HALT, data->bulk_out, buffer, |
| 352 | 0, USBTMC_TIMEOUT); |
| 353 | |
| 354 | if (rv < 0) { |
| 355 | dev_err(dev, "usb_control_msg returned %d\n", rv); |
| 356 | goto exit; |
| 357 | } |
| 358 | rv = 0; |
| 359 | |
| 360 | exit: |
| 361 | kfree(buffer); |
| 362 | return rv; |
| 363 | } |
| 364 | |
| 365 | static ssize_t usbtmc_read(struct file *filp, char __user *buf, |
| 366 | size_t count, loff_t *f_pos) |
| 367 | { |
| 368 | struct usbtmc_device_data *data; |
| 369 | struct device *dev; |
| 370 | unsigned long int n_characters; |
| 371 | u8 *buffer; |
| 372 | int actual; |
| 373 | int done; |
| 374 | int remaining; |
| 375 | int retval; |
| 376 | int this_part; |
| 377 | |
| 378 | /* Get pointer to private data structure */ |
| 379 | data = filp->private_data; |
| 380 | dev = &data->intf->dev; |
| 381 | |
| 382 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); |
| 383 | if (!buffer) |
| 384 | return -ENOMEM; |
| 385 | |
| 386 | mutex_lock(&data->io_mutex); |
| 387 | |
| 388 | remaining = count; |
| 389 | done = 0; |
| 390 | |
| 391 | while (remaining > 0) { |
| 392 | if (remaining > USBTMC_SIZE_IOBUFFER - 12 - 3) |
| 393 | this_part = USBTMC_SIZE_IOBUFFER - 12 - 3; |
| 394 | else |
| 395 | this_part = remaining; |
| 396 | |
| 397 | /* Setup IO buffer for DEV_DEP_MSG_IN message |
| 398 | * Refer to class specs for details |
| 399 | */ |
| 400 | buffer[0] = 2; |
| 401 | buffer[1] = data->bTag; |
| 402 | buffer[2] = ~(data->bTag); |
| 403 | buffer[3] = 0; /* Reserved */ |
| 404 | buffer[4] = (this_part - 12 - 3) & 255; |
| 405 | buffer[5] = ((this_part - 12 - 3) >> 8) & 255; |
| 406 | buffer[6] = ((this_part - 12 - 3) >> 16) & 255; |
| 407 | buffer[7] = ((this_part - 12 - 3) >> 24) & 255; |
| 408 | buffer[8] = data->TermCharEnabled * 2; |
| 409 | /* Use term character? */ |
| 410 | buffer[9] = data->TermChar; |
| 411 | buffer[10] = 0; /* Reserved */ |
| 412 | buffer[11] = 0; /* Reserved */ |
| 413 | |
| 414 | /* Send bulk URB */ |
| 415 | retval = usb_bulk_msg(data->usb_dev, |
| 416 | usb_sndbulkpipe(data->usb_dev, |
| 417 | data->bulk_out), |
| 418 | buffer, 12, &actual, USBTMC_TIMEOUT); |
| 419 | |
| 420 | /* Store bTag (in case we need to abort) */ |
| 421 | data->bTag_last_write = data->bTag; |
| 422 | |
| 423 | /* Increment bTag -- and increment again if zero */ |
| 424 | data->bTag++; |
| 425 | if (!data->bTag) |
| 426 | (data->bTag)++; |
| 427 | |
| 428 | if (retval < 0) { |
| 429 | dev_err(dev, "usb_bulk_msg returned %d\n", retval); |
| 430 | if (data->auto_abort) |
| 431 | usbtmc_ioctl_abort_bulk_out(data); |
| 432 | goto exit; |
| 433 | } |
| 434 | |
| 435 | /* Send bulk URB */ |
| 436 | retval = usb_bulk_msg(data->usb_dev, |
| 437 | usb_rcvbulkpipe(data->usb_dev, |
| 438 | data->bulk_in), |
| 439 | buffer, USBTMC_SIZE_IOBUFFER, &actual, |
| 440 | USBTMC_TIMEOUT); |
| 441 | |
| 442 | /* Store bTag (in case we need to abort) */ |
| 443 | data->bTag_last_read = data->bTag; |
| 444 | |
| 445 | if (retval < 0) { |
| 446 | dev_err(dev, "Unable to read data, error %d\n", retval); |
| 447 | if (data->auto_abort) |
| 448 | usbtmc_ioctl_abort_bulk_in(data); |
| 449 | goto exit; |
| 450 | } |
| 451 | |
| 452 | /* How many characters did the instrument send? */ |
| 453 | n_characters = buffer[4] + |
| 454 | (buffer[5] << 8) + |
| 455 | (buffer[6] << 16) + |
| 456 | (buffer[7] << 24); |
| 457 | |
| 458 | /* Copy buffer to user space */ |
| 459 | if (copy_to_user(buf + done, &buffer[12], n_characters)) { |
| 460 | /* There must have been an addressing problem */ |
| 461 | retval = -EFAULT; |
| 462 | goto exit; |
| 463 | } |
| 464 | |
| 465 | done += n_characters; |
| 466 | if (n_characters < USBTMC_SIZE_IOBUFFER) |
| 467 | remaining = 0; |
| 468 | } |
| 469 | |
| 470 | /* Update file position value */ |
| 471 | *f_pos = *f_pos + done; |
| 472 | retval = done; |
| 473 | |
| 474 | exit: |
| 475 | mutex_unlock(&data->io_mutex); |
| 476 | kfree(buffer); |
| 477 | return retval; |
| 478 | } |
| 479 | |
| 480 | static ssize_t usbtmc_write(struct file *filp, const char __user *buf, |
| 481 | size_t count, loff_t *f_pos) |
| 482 | { |
| 483 | struct usbtmc_device_data *data; |
| 484 | u8 *buffer; |
| 485 | int retval; |
| 486 | int actual; |
| 487 | unsigned long int n_bytes; |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 488 | int remaining; |
| 489 | int done; |
| 490 | int this_part; |
| 491 | |
| 492 | data = filp->private_data; |
| 493 | |
| 494 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); |
| 495 | if (!buffer) |
| 496 | return -ENOMEM; |
| 497 | |
| 498 | mutex_lock(&data->io_mutex); |
| 499 | |
| 500 | remaining = count; |
| 501 | done = 0; |
| 502 | |
| 503 | while (remaining > 0) { |
| 504 | if (remaining > USBTMC_SIZE_IOBUFFER - 12) { |
| 505 | this_part = USBTMC_SIZE_IOBUFFER - 12; |
| 506 | buffer[8] = 0; |
| 507 | } else { |
| 508 | this_part = remaining; |
| 509 | buffer[8] = 1; |
| 510 | } |
| 511 | |
| 512 | /* Setup IO buffer for DEV_DEP_MSG_OUT message */ |
| 513 | buffer[0] = 1; |
| 514 | buffer[1] = data->bTag; |
| 515 | buffer[2] = ~(data->bTag); |
| 516 | buffer[3] = 0; /* Reserved */ |
| 517 | buffer[4] = this_part & 255; |
| 518 | buffer[5] = (this_part >> 8) & 255; |
| 519 | buffer[6] = (this_part >> 16) & 255; |
| 520 | buffer[7] = (this_part >> 24) & 255; |
| 521 | /* buffer[8] is set above... */ |
| 522 | buffer[9] = 0; /* Reserved */ |
| 523 | buffer[10] = 0; /* Reserved */ |
| 524 | buffer[11] = 0; /* Reserved */ |
| 525 | |
| 526 | if (copy_from_user(&buffer[12], buf + done, this_part)) { |
| 527 | retval = -EFAULT; |
| 528 | goto exit; |
| 529 | } |
| 530 | |
Ilpo Järvinen | 857cc4d | 2008-10-30 13:56:47 +0200 | [diff] [blame] | 531 | n_bytes = roundup(12 + this_part, 4); |
| 532 | memset(buffer + 12 + this_part, 0, n_bytes - (12 + this_part)); |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 533 | |
| 534 | retval = usb_bulk_msg(data->usb_dev, |
| 535 | usb_sndbulkpipe(data->usb_dev, |
| 536 | data->bulk_out), |
| 537 | buffer, n_bytes, &actual, USBTMC_TIMEOUT); |
| 538 | |
| 539 | data->bTag_last_write = data->bTag; |
| 540 | data->bTag++; |
| 541 | |
| 542 | if (!data->bTag) |
| 543 | data->bTag++; |
| 544 | |
| 545 | if (retval < 0) { |
| 546 | dev_err(&data->intf->dev, |
| 547 | "Unable to send data, error %d\n", retval); |
| 548 | if (data->auto_abort) |
| 549 | usbtmc_ioctl_abort_bulk_out(data); |
| 550 | goto exit; |
| 551 | } |
| 552 | |
| 553 | remaining -= this_part; |
| 554 | done += this_part; |
| 555 | } |
| 556 | |
| 557 | retval = count; |
| 558 | exit: |
| 559 | mutex_unlock(&data->io_mutex); |
| 560 | kfree(buffer); |
| 561 | return retval; |
| 562 | } |
| 563 | |
| 564 | static int usbtmc_ioctl_clear(struct usbtmc_device_data *data) |
| 565 | { |
| 566 | struct usb_host_interface *current_setting; |
| 567 | struct usb_endpoint_descriptor *desc; |
| 568 | struct device *dev; |
| 569 | u8 *buffer; |
| 570 | int rv; |
| 571 | int n; |
| 572 | int actual; |
| 573 | int max_size; |
| 574 | |
| 575 | dev = &data->intf->dev; |
| 576 | |
| 577 | dev_dbg(dev, "Sending INITIATE_CLEAR request\n"); |
| 578 | |
| 579 | buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL); |
| 580 | if (!buffer) |
| 581 | return -ENOMEM; |
| 582 | |
| 583 | rv = usb_control_msg(data->usb_dev, |
| 584 | usb_rcvctrlpipe(data->usb_dev, 0), |
| 585 | USBTMC_REQUEST_INITIATE_CLEAR, |
| 586 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 587 | 0, 0, buffer, 1, USBTMC_TIMEOUT); |
| 588 | if (rv < 0) { |
| 589 | dev_err(dev, "usb_control_msg returned %d\n", rv); |
| 590 | goto exit; |
| 591 | } |
| 592 | |
| 593 | dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]); |
| 594 | |
| 595 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| 596 | dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]); |
| 597 | rv = -EPERM; |
| 598 | goto exit; |
| 599 | } |
| 600 | |
| 601 | max_size = 0; |
| 602 | current_setting = data->intf->cur_altsetting; |
| 603 | for (n = 0; n < current_setting->desc.bNumEndpoints; n++) { |
| 604 | desc = ¤t_setting->endpoint[n].desc; |
| 605 | if (desc->bEndpointAddress == data->bulk_in) |
| 606 | max_size = le16_to_cpu(desc->wMaxPacketSize); |
| 607 | } |
| 608 | |
| 609 | if (max_size == 0) { |
| 610 | dev_err(dev, "Couldn't get wMaxPacketSize\n"); |
| 611 | rv = -EPERM; |
| 612 | goto exit; |
| 613 | } |
| 614 | |
| 615 | dev_dbg(dev, "wMaxPacketSize is %d\n", max_size); |
| 616 | |
| 617 | n = 0; |
| 618 | |
| 619 | usbtmc_clear_check_status: |
| 620 | |
| 621 | dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n"); |
| 622 | |
| 623 | rv = usb_control_msg(data->usb_dev, |
| 624 | usb_rcvctrlpipe(data->usb_dev, 0), |
| 625 | USBTMC_REQUEST_CHECK_CLEAR_STATUS, |
| 626 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 627 | 0, 0, buffer, 2, USBTMC_TIMEOUT); |
| 628 | if (rv < 0) { |
| 629 | dev_err(dev, "usb_control_msg returned %d\n", rv); |
| 630 | goto exit; |
| 631 | } |
| 632 | |
| 633 | dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]); |
| 634 | |
| 635 | if (buffer[0] == USBTMC_STATUS_SUCCESS) |
| 636 | goto usbtmc_clear_bulk_out_halt; |
| 637 | |
| 638 | if (buffer[0] != USBTMC_STATUS_PENDING) { |
| 639 | dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]); |
| 640 | rv = -EPERM; |
| 641 | goto exit; |
| 642 | } |
| 643 | |
| 644 | if (buffer[1] == 1) |
| 645 | do { |
| 646 | dev_dbg(dev, "Reading from bulk in EP\n"); |
| 647 | |
| 648 | rv = usb_bulk_msg(data->usb_dev, |
| 649 | usb_rcvbulkpipe(data->usb_dev, |
| 650 | data->bulk_in), |
| 651 | buffer, USBTMC_SIZE_IOBUFFER, |
| 652 | &actual, USBTMC_TIMEOUT); |
| 653 | n++; |
| 654 | |
| 655 | if (rv < 0) { |
| 656 | dev_err(dev, "usb_control_msg returned %d\n", |
| 657 | rv); |
| 658 | goto exit; |
| 659 | } |
| 660 | } while ((actual == max_size) && |
| 661 | (n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN)); |
| 662 | |
| 663 | if (actual == max_size) { |
| 664 | dev_err(dev, "Couldn't clear device buffer within %d cycles\n", |
| 665 | USBTMC_MAX_READS_TO_CLEAR_BULK_IN); |
| 666 | rv = -EPERM; |
| 667 | goto exit; |
| 668 | } |
| 669 | |
| 670 | goto usbtmc_clear_check_status; |
| 671 | |
| 672 | usbtmc_clear_bulk_out_halt: |
| 673 | |
| 674 | rv = usb_control_msg(data->usb_dev, |
| 675 | usb_sndctrlpipe(data->usb_dev, 0), |
| 676 | USB_REQ_CLEAR_FEATURE, |
| 677 | USB_DIR_OUT | USB_TYPE_STANDARD | |
| 678 | USB_RECIP_ENDPOINT, |
| 679 | USB_ENDPOINT_HALT, |
| 680 | data->bulk_out, buffer, 0, |
| 681 | USBTMC_TIMEOUT); |
| 682 | if (rv < 0) { |
| 683 | dev_err(dev, "usb_control_msg returned %d\n", rv); |
| 684 | goto exit; |
| 685 | } |
| 686 | rv = 0; |
| 687 | |
| 688 | exit: |
| 689 | kfree(buffer); |
| 690 | return rv; |
| 691 | } |
| 692 | |
| 693 | static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data) |
| 694 | { |
| 695 | u8 *buffer; |
| 696 | int rv; |
| 697 | |
| 698 | buffer = kmalloc(2, GFP_KERNEL); |
| 699 | if (!buffer) |
| 700 | return -ENOMEM; |
| 701 | |
| 702 | rv = usb_control_msg(data->usb_dev, |
| 703 | usb_sndctrlpipe(data->usb_dev, 0), |
| 704 | USB_REQ_CLEAR_FEATURE, |
| 705 | USB_DIR_OUT | USB_TYPE_STANDARD | |
| 706 | USB_RECIP_ENDPOINT, |
| 707 | USB_ENDPOINT_HALT, data->bulk_out, |
| 708 | buffer, 0, USBTMC_TIMEOUT); |
| 709 | |
| 710 | if (rv < 0) { |
| 711 | dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n", |
| 712 | rv); |
| 713 | goto exit; |
| 714 | } |
| 715 | rv = 0; |
| 716 | |
| 717 | exit: |
| 718 | kfree(buffer); |
| 719 | return rv; |
| 720 | } |
| 721 | |
| 722 | static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data) |
| 723 | { |
| 724 | u8 *buffer; |
| 725 | int rv; |
| 726 | |
| 727 | buffer = kmalloc(2, GFP_KERNEL); |
| 728 | if (!buffer) |
| 729 | return -ENOMEM; |
| 730 | |
| 731 | rv = usb_control_msg(data->usb_dev, usb_sndctrlpipe(data->usb_dev, 0), |
| 732 | USB_REQ_CLEAR_FEATURE, |
| 733 | USB_DIR_OUT | USB_TYPE_STANDARD | |
| 734 | USB_RECIP_ENDPOINT, |
| 735 | USB_ENDPOINT_HALT, data->bulk_in, buffer, 0, |
| 736 | USBTMC_TIMEOUT); |
| 737 | |
| 738 | if (rv < 0) { |
| 739 | dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n", |
| 740 | rv); |
| 741 | goto exit; |
| 742 | } |
| 743 | rv = 0; |
| 744 | |
| 745 | exit: |
| 746 | kfree(buffer); |
| 747 | return rv; |
| 748 | } |
| 749 | |
| 750 | static int get_capabilities(struct usbtmc_device_data *data) |
| 751 | { |
| 752 | struct device *dev = &data->usb_dev->dev; |
| 753 | char *buffer; |
| 754 | int rv; |
| 755 | |
| 756 | buffer = kmalloc(0x18, GFP_KERNEL); |
| 757 | if (!buffer) |
| 758 | return -ENOMEM; |
| 759 | |
| 760 | rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0), |
| 761 | USBTMC_REQUEST_GET_CAPABILITIES, |
| 762 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 763 | 0, 0, buffer, 0x18, USBTMC_TIMEOUT); |
| 764 | if (rv < 0) { |
| 765 | dev_err(dev, "usb_control_msg returned %d\n", rv); |
| 766 | return rv; |
| 767 | } |
| 768 | |
| 769 | dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); |
| 770 | dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]); |
| 771 | dev_dbg(dev, "Device capabilities are %x\n", buffer[5]); |
| 772 | dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]); |
| 773 | dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]); |
| 774 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| 775 | dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]); |
| 776 | return -EPERM; |
| 777 | } |
| 778 | |
| 779 | data->capabilities.interface_capabilities = buffer[4]; |
| 780 | data->capabilities.device_capabilities = buffer[5]; |
| 781 | data->capabilities.usb488_interface_capabilities = buffer[14]; |
| 782 | data->capabilities.usb488_device_capabilities = buffer[15]; |
| 783 | |
| 784 | kfree(buffer); |
| 785 | return 0; |
| 786 | } |
| 787 | |
| 788 | #define capability_attribute(name) \ |
| 789 | static ssize_t show_##name(struct device *dev, \ |
| 790 | struct device_attribute *attr, char *buf) \ |
| 791 | { \ |
| 792 | struct usb_interface *intf = to_usb_interface(dev); \ |
| 793 | struct usbtmc_device_data *data = usb_get_intfdata(intf); \ |
| 794 | \ |
| 795 | return sprintf(buf, "%d\n", data->capabilities.name); \ |
| 796 | } \ |
| 797 | static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) |
| 798 | |
| 799 | capability_attribute(interface_capabilities); |
| 800 | capability_attribute(device_capabilities); |
| 801 | capability_attribute(usb488_interface_capabilities); |
| 802 | capability_attribute(usb488_device_capabilities); |
| 803 | |
| 804 | static struct attribute *capability_attrs[] = { |
| 805 | &dev_attr_interface_capabilities.attr, |
| 806 | &dev_attr_device_capabilities.attr, |
| 807 | &dev_attr_usb488_interface_capabilities.attr, |
| 808 | &dev_attr_usb488_device_capabilities.attr, |
| 809 | NULL, |
| 810 | }; |
| 811 | |
| 812 | static struct attribute_group capability_attr_grp = { |
| 813 | .attrs = capability_attrs, |
| 814 | }; |
| 815 | |
| 816 | static ssize_t show_TermChar(struct device *dev, |
| 817 | struct device_attribute *attr, char *buf) |
| 818 | { |
| 819 | struct usb_interface *intf = to_usb_interface(dev); |
| 820 | struct usbtmc_device_data *data = usb_get_intfdata(intf); |
| 821 | |
| 822 | return sprintf(buf, "%c\n", data->TermChar); |
| 823 | } |
| 824 | |
| 825 | static ssize_t store_TermChar(struct device *dev, |
| 826 | struct device_attribute *attr, |
| 827 | const char *buf, size_t count) |
| 828 | { |
| 829 | struct usb_interface *intf = to_usb_interface(dev); |
| 830 | struct usbtmc_device_data *data = usb_get_intfdata(intf); |
| 831 | |
| 832 | if (count < 1) |
| 833 | return -EINVAL; |
| 834 | data->TermChar = buf[0]; |
| 835 | return count; |
| 836 | } |
| 837 | static DEVICE_ATTR(TermChar, S_IRUGO, show_TermChar, store_TermChar); |
| 838 | |
| 839 | #define data_attribute(name) \ |
| 840 | static ssize_t show_##name(struct device *dev, \ |
| 841 | struct device_attribute *attr, char *buf) \ |
| 842 | { \ |
| 843 | struct usb_interface *intf = to_usb_interface(dev); \ |
| 844 | struct usbtmc_device_data *data = usb_get_intfdata(intf); \ |
| 845 | \ |
| 846 | return sprintf(buf, "%d\n", data->name); \ |
| 847 | } \ |
| 848 | static ssize_t store_##name(struct device *dev, \ |
| 849 | struct device_attribute *attr, \ |
| 850 | const char *buf, size_t count) \ |
| 851 | { \ |
| 852 | struct usb_interface *intf = to_usb_interface(dev); \ |
| 853 | struct usbtmc_device_data *data = usb_get_intfdata(intf); \ |
| 854 | ssize_t result; \ |
| 855 | unsigned val; \ |
| 856 | \ |
| 857 | result = sscanf(buf, "%u\n", &val); \ |
| 858 | if (result != 1) \ |
| 859 | result = -EINVAL; \ |
| 860 | data->name = val; \ |
| 861 | if (result < 0) \ |
| 862 | return result; \ |
| 863 | else \ |
| 864 | return count; \ |
| 865 | } \ |
| 866 | static DEVICE_ATTR(name, S_IRUGO, show_##name, store_##name) |
| 867 | |
| 868 | data_attribute(TermCharEnabled); |
| 869 | data_attribute(auto_abort); |
| 870 | |
| 871 | static struct attribute *data_attrs[] = { |
| 872 | &dev_attr_TermChar.attr, |
| 873 | &dev_attr_TermCharEnabled.attr, |
| 874 | &dev_attr_auto_abort.attr, |
| 875 | NULL, |
| 876 | }; |
| 877 | |
| 878 | static struct attribute_group data_attr_grp = { |
| 879 | .attrs = data_attrs, |
| 880 | }; |
| 881 | |
| 882 | static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data) |
| 883 | { |
| 884 | struct device *dev; |
| 885 | u8 *buffer; |
| 886 | int rv; |
| 887 | |
| 888 | dev = &data->intf->dev; |
| 889 | |
| 890 | buffer = kmalloc(2, GFP_KERNEL); |
| 891 | if (!buffer) |
| 892 | return -ENOMEM; |
| 893 | |
| 894 | rv = usb_control_msg(data->usb_dev, |
| 895 | usb_rcvctrlpipe(data->usb_dev, 0), |
| 896 | USBTMC_REQUEST_INDICATOR_PULSE, |
| 897 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 898 | 0, 0, buffer, 0x01, USBTMC_TIMEOUT); |
| 899 | |
| 900 | if (rv < 0) { |
| 901 | dev_err(dev, "usb_control_msg returned %d\n", rv); |
| 902 | goto exit; |
| 903 | } |
| 904 | |
| 905 | dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]); |
| 906 | |
| 907 | if (buffer[0] != USBTMC_STATUS_SUCCESS) { |
| 908 | dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]); |
| 909 | rv = -EPERM; |
| 910 | goto exit; |
| 911 | } |
| 912 | rv = 0; |
| 913 | |
| 914 | exit: |
| 915 | kfree(buffer); |
| 916 | return rv; |
| 917 | } |
| 918 | |
| 919 | static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 920 | { |
| 921 | struct usbtmc_device_data *data; |
| 922 | int retval = -EBADRQC; |
| 923 | |
| 924 | data = file->private_data; |
| 925 | mutex_lock(&data->io_mutex); |
| 926 | |
| 927 | switch (cmd) { |
| 928 | case USBTMC_IOCTL_CLEAR_OUT_HALT: |
| 929 | retval = usbtmc_ioctl_clear_out_halt(data); |
Greg Kroah-Hartman | a92b63e | 2009-06-15 13:13:05 -0700 | [diff] [blame] | 930 | break; |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 931 | |
| 932 | case USBTMC_IOCTL_CLEAR_IN_HALT: |
| 933 | retval = usbtmc_ioctl_clear_in_halt(data); |
Greg Kroah-Hartman | a92b63e | 2009-06-15 13:13:05 -0700 | [diff] [blame] | 934 | break; |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 935 | |
| 936 | case USBTMC_IOCTL_INDICATOR_PULSE: |
| 937 | retval = usbtmc_ioctl_indicator_pulse(data); |
Greg Kroah-Hartman | a92b63e | 2009-06-15 13:13:05 -0700 | [diff] [blame] | 938 | break; |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 939 | |
| 940 | case USBTMC_IOCTL_CLEAR: |
| 941 | retval = usbtmc_ioctl_clear(data); |
Greg Kroah-Hartman | a92b63e | 2009-06-15 13:13:05 -0700 | [diff] [blame] | 942 | break; |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 943 | |
| 944 | case USBTMC_IOCTL_ABORT_BULK_OUT: |
| 945 | retval = usbtmc_ioctl_abort_bulk_out(data); |
Greg Kroah-Hartman | a92b63e | 2009-06-15 13:13:05 -0700 | [diff] [blame] | 946 | break; |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 947 | |
| 948 | case USBTMC_IOCTL_ABORT_BULK_IN: |
| 949 | retval = usbtmc_ioctl_abort_bulk_in(data); |
Greg Kroah-Hartman | a92b63e | 2009-06-15 13:13:05 -0700 | [diff] [blame] | 950 | break; |
Greg Kroah-Hartman | 5b775f6 | 2008-08-26 16:22:06 -0700 | [diff] [blame] | 951 | } |
| 952 | |
| 953 | mutex_unlock(&data->io_mutex); |
| 954 | return retval; |
| 955 | } |
| 956 | |
| 957 | static struct file_operations fops = { |
| 958 | .owner = THIS_MODULE, |
| 959 | .read = usbtmc_read, |
| 960 | .write = usbtmc_write, |
| 961 | .open = usbtmc_open, |
| 962 | .release = usbtmc_release, |
| 963 | .unlocked_ioctl = usbtmc_ioctl, |
| 964 | }; |
| 965 | |
| 966 | static struct usb_class_driver usbtmc_class = { |
| 967 | .name = "usbtmc%d", |
| 968 | .fops = &fops, |
| 969 | .minor_base = USBTMC_MINOR_BASE, |
| 970 | }; |
| 971 | |
| 972 | |
| 973 | static int usbtmc_probe(struct usb_interface *intf, |
| 974 | const struct usb_device_id *id) |
| 975 | { |
| 976 | struct usbtmc_device_data *data; |
| 977 | struct usb_host_interface *iface_desc; |
| 978 | struct usb_endpoint_descriptor *endpoint; |
| 979 | int n; |
| 980 | int retcode; |
| 981 | |
| 982 | dev_dbg(&intf->dev, "%s called\n", __func__); |
| 983 | |
| 984 | data = kmalloc(sizeof(struct usbtmc_device_data), GFP_KERNEL); |
| 985 | if (!data) { |
| 986 | dev_err(&intf->dev, "Unable to allocate kernel memory\n"); |
| 987 | return -ENOMEM; |
| 988 | } |
| 989 | |
| 990 | data->intf = intf; |
| 991 | data->id = id; |
| 992 | data->usb_dev = usb_get_dev(interface_to_usbdev(intf)); |
| 993 | usb_set_intfdata(intf, data); |
| 994 | kref_init(&data->kref); |
| 995 | mutex_init(&data->io_mutex); |
| 996 | |
| 997 | /* Initialize USBTMC bTag and other fields */ |
| 998 | data->bTag = 1; |
| 999 | data->TermCharEnabled = 0; |
| 1000 | data->TermChar = '\n'; |
| 1001 | |
| 1002 | /* USBTMC devices have only one setting, so use that */ |
| 1003 | iface_desc = data->intf->cur_altsetting; |
| 1004 | |
| 1005 | /* Find bulk in endpoint */ |
| 1006 | for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { |
| 1007 | endpoint = &iface_desc->endpoint[n].desc; |
| 1008 | |
| 1009 | if (usb_endpoint_is_bulk_in(endpoint)) { |
| 1010 | data->bulk_in = endpoint->bEndpointAddress; |
| 1011 | dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", |
| 1012 | data->bulk_in); |
| 1013 | break; |
| 1014 | } |
| 1015 | } |
| 1016 | |
| 1017 | /* Find bulk out endpoint */ |
| 1018 | for (n = 0; n < iface_desc->desc.bNumEndpoints; n++) { |
| 1019 | endpoint = &iface_desc->endpoint[n].desc; |
| 1020 | |
| 1021 | if (usb_endpoint_is_bulk_out(endpoint)) { |
| 1022 | data->bulk_out = endpoint->bEndpointAddress; |
| 1023 | dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n", |
| 1024 | data->bulk_out); |
| 1025 | break; |
| 1026 | } |
| 1027 | } |
| 1028 | |
| 1029 | retcode = get_capabilities(data); |
| 1030 | if (retcode) |
| 1031 | dev_err(&intf->dev, "can't read capabilities\n"); |
| 1032 | else |
| 1033 | retcode = sysfs_create_group(&intf->dev.kobj, |
| 1034 | &capability_attr_grp); |
| 1035 | |
| 1036 | retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp); |
| 1037 | |
| 1038 | retcode = usb_register_dev(intf, &usbtmc_class); |
| 1039 | if (retcode) { |
| 1040 | dev_err(&intf->dev, "Not able to get a minor" |
| 1041 | " (base %u, slice default): %d\n", USBTMC_MINOR_BASE, |
| 1042 | retcode); |
| 1043 | goto error_register; |
| 1044 | } |
| 1045 | dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor); |
| 1046 | |
| 1047 | return 0; |
| 1048 | |
| 1049 | error_register: |
| 1050 | sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp); |
| 1051 | sysfs_remove_group(&intf->dev.kobj, &data_attr_grp); |
| 1052 | kref_put(&data->kref, usbtmc_delete); |
| 1053 | return retcode; |
| 1054 | } |
| 1055 | |
| 1056 | static void usbtmc_disconnect(struct usb_interface *intf) |
| 1057 | { |
| 1058 | struct usbtmc_device_data *data; |
| 1059 | |
| 1060 | dev_dbg(&intf->dev, "usbtmc_disconnect called\n"); |
| 1061 | |
| 1062 | data = usb_get_intfdata(intf); |
| 1063 | usb_deregister_dev(intf, &usbtmc_class); |
| 1064 | sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp); |
| 1065 | sysfs_remove_group(&intf->dev.kobj, &data_attr_grp); |
| 1066 | kref_put(&data->kref, usbtmc_delete); |
| 1067 | } |
| 1068 | |
| 1069 | static struct usb_driver usbtmc_driver = { |
| 1070 | .name = "usbtmc", |
| 1071 | .id_table = usbtmc_devices, |
| 1072 | .probe = usbtmc_probe, |
| 1073 | .disconnect = usbtmc_disconnect |
| 1074 | }; |
| 1075 | |
| 1076 | static int __init usbtmc_init(void) |
| 1077 | { |
| 1078 | int retcode; |
| 1079 | |
| 1080 | retcode = usb_register(&usbtmc_driver); |
| 1081 | if (retcode) |
| 1082 | printk(KERN_ERR KBUILD_MODNAME": Unable to register driver\n"); |
| 1083 | return retcode; |
| 1084 | } |
| 1085 | module_init(usbtmc_init); |
| 1086 | |
| 1087 | static void __exit usbtmc_exit(void) |
| 1088 | { |
| 1089 | usb_deregister(&usbtmc_driver); |
| 1090 | } |
| 1091 | module_exit(usbtmc_exit); |
| 1092 | |
| 1093 | MODULE_LICENSE("GPL"); |