Stephane Grosjean | bb47855 | 2012-03-02 16:13:04 +0100 | [diff] [blame] | 1 | /* |
| 2 | * CAN driver for PEAK System USB adapters |
| 3 | * Derived from the PCAN project file driver/src/pcan_usb_core.c |
| 4 | * |
| 5 | * Copyright (C) 2003-2010 PEAK System-Technik GmbH |
| 6 | * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com> |
| 7 | * |
| 8 | * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License as published |
| 12 | * by the Free Software Foundation; version 2 of the License. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | */ |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/signal.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/netdevice.h> |
| 24 | #include <linux/usb.h> |
| 25 | |
| 26 | #include <linux/can.h> |
| 27 | #include <linux/can/dev.h> |
| 28 | #include <linux/can/error.h> |
| 29 | |
| 30 | #include "pcan_usb_core.h" |
| 31 | |
| 32 | MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>"); |
| 33 | MODULE_DESCRIPTION("CAN driver for PEAK-System USB adapters"); |
| 34 | MODULE_LICENSE("GPL v2"); |
| 35 | |
| 36 | /* Table of devices that work with this driver */ |
| 37 | static struct usb_device_id peak_usb_table[] = { |
| 38 | {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USB_PRODUCT_ID)}, |
| 39 | {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPRO_PRODUCT_ID)}, |
| 40 | {} /* Terminating entry */ |
| 41 | }; |
| 42 | |
| 43 | MODULE_DEVICE_TABLE(usb, peak_usb_table); |
| 44 | |
| 45 | /* List of supported PCAN-USB adapters (NULL terminated list) */ |
| 46 | static struct peak_usb_adapter *peak_usb_adapters_list[] = { |
| 47 | &pcan_usb, |
| 48 | &pcan_usb_pro, |
| 49 | NULL, |
| 50 | }; |
| 51 | |
| 52 | /* |
| 53 | * dump memory |
| 54 | */ |
| 55 | #define DUMP_WIDTH 16 |
Randy Dunlap | 56b9f30 | 2012-09-02 10:13:11 -0700 | [diff] [blame^] | 56 | void pcan_dump_mem(char *prompt, void *p, int l) |
Stephane Grosjean | bb47855 | 2012-03-02 16:13:04 +0100 | [diff] [blame] | 57 | { |
| 58 | pr_info("%s dumping %s (%d bytes):\n", |
| 59 | PCAN_USB_DRIVER_NAME, prompt ? prompt : "memory", l); |
| 60 | print_hex_dump(KERN_INFO, PCAN_USB_DRIVER_NAME " ", DUMP_PREFIX_NONE, |
| 61 | DUMP_WIDTH, 1, p, l, false); |
| 62 | } |
| 63 | |
| 64 | /* |
| 65 | * initialize a time_ref object with usb adapter own settings |
| 66 | */ |
| 67 | void peak_usb_init_time_ref(struct peak_time_ref *time_ref, |
| 68 | struct peak_usb_adapter *adapter) |
| 69 | { |
| 70 | if (time_ref) { |
| 71 | memset(time_ref, 0, sizeof(struct peak_time_ref)); |
| 72 | time_ref->adapter = adapter; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | static void peak_usb_add_us(struct timeval *tv, u32 delta_us) |
| 77 | { |
| 78 | /* number of s. to add to final time */ |
| 79 | u32 delta_s = delta_us / 1000000; |
| 80 | |
| 81 | delta_us -= delta_s * 1000000; |
| 82 | |
| 83 | tv->tv_usec += delta_us; |
| 84 | if (tv->tv_usec >= 1000000) { |
| 85 | tv->tv_usec -= 1000000; |
| 86 | delta_s++; |
| 87 | } |
| 88 | tv->tv_sec += delta_s; |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * sometimes, another now may be more recent than current one... |
| 93 | */ |
| 94 | void peak_usb_update_ts_now(struct peak_time_ref *time_ref, u32 ts_now) |
| 95 | { |
| 96 | time_ref->ts_dev_2 = ts_now; |
| 97 | |
| 98 | /* should wait at least two passes before computing */ |
| 99 | if (time_ref->tv_host.tv_sec > 0) { |
| 100 | u32 delta_ts = time_ref->ts_dev_2 - time_ref->ts_dev_1; |
| 101 | |
| 102 | if (time_ref->ts_dev_2 < time_ref->ts_dev_1) |
| 103 | delta_ts &= (1 << time_ref->adapter->ts_used_bits) - 1; |
| 104 | |
| 105 | time_ref->ts_total += delta_ts; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * register device timestamp as now |
| 111 | */ |
| 112 | void peak_usb_set_ts_now(struct peak_time_ref *time_ref, u32 ts_now) |
| 113 | { |
| 114 | if (time_ref->tv_host_0.tv_sec == 0) { |
| 115 | /* use monotonic clock to correctly compute further deltas */ |
| 116 | time_ref->tv_host_0 = ktime_to_timeval(ktime_get()); |
| 117 | time_ref->tv_host.tv_sec = 0; |
| 118 | } else { |
| 119 | /* |
| 120 | * delta_us should not be >= 2^32 => delta_s should be < 4294 |
| 121 | * handle 32-bits wrapping here: if count of s. reaches 4200, |
| 122 | * reset counters and change time base |
| 123 | */ |
| 124 | if (time_ref->tv_host.tv_sec != 0) { |
| 125 | u32 delta_s = time_ref->tv_host.tv_sec |
| 126 | - time_ref->tv_host_0.tv_sec; |
| 127 | if (delta_s > 4200) { |
| 128 | time_ref->tv_host_0 = time_ref->tv_host; |
| 129 | time_ref->ts_total = 0; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | time_ref->tv_host = ktime_to_timeval(ktime_get()); |
| 134 | time_ref->tick_count++; |
| 135 | } |
| 136 | |
| 137 | time_ref->ts_dev_1 = time_ref->ts_dev_2; |
| 138 | peak_usb_update_ts_now(time_ref, ts_now); |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * compute timeval according to current ts and time_ref data |
| 143 | */ |
| 144 | void peak_usb_get_ts_tv(struct peak_time_ref *time_ref, u32 ts, |
| 145 | struct timeval *tv) |
| 146 | { |
| 147 | /* protect from getting timeval before setting now */ |
| 148 | if (time_ref->tv_host.tv_sec > 0) { |
| 149 | u64 delta_us; |
| 150 | |
| 151 | delta_us = ts - time_ref->ts_dev_2; |
| 152 | if (ts < time_ref->ts_dev_2) |
| 153 | delta_us &= (1 << time_ref->adapter->ts_used_bits) - 1; |
| 154 | |
| 155 | delta_us += time_ref->ts_total; |
| 156 | |
| 157 | delta_us *= time_ref->adapter->us_per_ts_scale; |
| 158 | delta_us >>= time_ref->adapter->us_per_ts_shift; |
| 159 | |
| 160 | *tv = time_ref->tv_host_0; |
| 161 | peak_usb_add_us(tv, (u32)delta_us); |
| 162 | } else { |
| 163 | *tv = ktime_to_timeval(ktime_get()); |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * callback for bulk Rx urb |
| 169 | */ |
| 170 | static void peak_usb_read_bulk_callback(struct urb *urb) |
| 171 | { |
| 172 | struct peak_usb_device *dev = urb->context; |
| 173 | struct net_device *netdev; |
| 174 | int err; |
| 175 | |
| 176 | netdev = dev->netdev; |
| 177 | |
| 178 | if (!netif_device_present(netdev)) |
| 179 | return; |
| 180 | |
| 181 | /* check reception status */ |
| 182 | switch (urb->status) { |
| 183 | case 0: |
| 184 | /* success */ |
| 185 | break; |
| 186 | |
| 187 | case -EILSEQ: |
| 188 | case -ENOENT: |
| 189 | case -ECONNRESET: |
| 190 | case -ESHUTDOWN: |
| 191 | return; |
| 192 | |
| 193 | default: |
| 194 | if (net_ratelimit()) |
| 195 | netdev_err(netdev, |
| 196 | "Rx urb aborted (%d)\n", urb->status); |
| 197 | goto resubmit_urb; |
| 198 | } |
| 199 | |
| 200 | /* protect from any incoming empty msgs */ |
| 201 | if ((urb->actual_length > 0) && (dev->adapter->dev_decode_buf)) { |
| 202 | /* handle these kinds of msgs only if _start callback called */ |
| 203 | if (dev->state & PCAN_USB_STATE_STARTED) { |
| 204 | err = dev->adapter->dev_decode_buf(dev, urb); |
| 205 | if (err) |
Randy Dunlap | 56b9f30 | 2012-09-02 10:13:11 -0700 | [diff] [blame^] | 206 | pcan_dump_mem("received usb message", |
| 207 | urb->transfer_buffer, |
| 208 | urb->transfer_buffer_length); |
Stephane Grosjean | bb47855 | 2012-03-02 16:13:04 +0100 | [diff] [blame] | 209 | } |
| 210 | } |
| 211 | |
| 212 | resubmit_urb: |
| 213 | usb_fill_bulk_urb(urb, dev->udev, |
| 214 | usb_rcvbulkpipe(dev->udev, dev->ep_msg_in), |
| 215 | urb->transfer_buffer, dev->adapter->rx_buffer_size, |
| 216 | peak_usb_read_bulk_callback, dev); |
| 217 | |
| 218 | usb_anchor_urb(urb, &dev->rx_submitted); |
| 219 | err = usb_submit_urb(urb, GFP_ATOMIC); |
| 220 | if (!err) |
| 221 | return; |
| 222 | |
| 223 | usb_unanchor_urb(urb); |
| 224 | |
| 225 | if (err == -ENODEV) |
| 226 | netif_device_detach(netdev); |
| 227 | else |
| 228 | netdev_err(netdev, "failed resubmitting read bulk urb: %d\n", |
| 229 | err); |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * callback for bulk Tx urb |
| 234 | */ |
| 235 | static void peak_usb_write_bulk_callback(struct urb *urb) |
| 236 | { |
| 237 | struct peak_tx_urb_context *context = urb->context; |
| 238 | struct peak_usb_device *dev; |
| 239 | struct net_device *netdev; |
| 240 | |
| 241 | BUG_ON(!context); |
| 242 | |
| 243 | dev = context->dev; |
| 244 | netdev = dev->netdev; |
| 245 | |
| 246 | atomic_dec(&dev->active_tx_urbs); |
| 247 | |
| 248 | if (!netif_device_present(netdev)) |
| 249 | return; |
| 250 | |
| 251 | /* check tx status */ |
| 252 | switch (urb->status) { |
| 253 | case 0: |
| 254 | /* transmission complete */ |
| 255 | netdev->stats.tx_packets++; |
| 256 | netdev->stats.tx_bytes += context->dlc; |
| 257 | |
| 258 | /* prevent tx timeout */ |
| 259 | netdev->trans_start = jiffies; |
| 260 | break; |
| 261 | |
| 262 | default: |
| 263 | if (net_ratelimit()) |
| 264 | netdev_err(netdev, "Tx urb aborted (%d)\n", |
| 265 | urb->status); |
| 266 | case -EPROTO: |
| 267 | case -ENOENT: |
| 268 | case -ECONNRESET: |
| 269 | case -ESHUTDOWN: |
| 270 | |
| 271 | break; |
| 272 | } |
| 273 | |
| 274 | /* should always release echo skb and corresponding context */ |
| 275 | can_get_echo_skb(netdev, context->echo_index); |
| 276 | context->echo_index = PCAN_USB_MAX_TX_URBS; |
| 277 | |
| 278 | /* do wakeup tx queue in case of success only */ |
| 279 | if (!urb->status) |
| 280 | netif_wake_queue(netdev); |
| 281 | } |
| 282 | |
| 283 | /* |
| 284 | * called by netdev to send one skb on the CAN interface. |
| 285 | */ |
| 286 | static netdev_tx_t peak_usb_ndo_start_xmit(struct sk_buff *skb, |
| 287 | struct net_device *netdev) |
| 288 | { |
| 289 | struct peak_usb_device *dev = netdev_priv(netdev); |
| 290 | struct peak_tx_urb_context *context = NULL; |
| 291 | struct net_device_stats *stats = &netdev->stats; |
| 292 | struct can_frame *cf = (struct can_frame *)skb->data; |
| 293 | struct urb *urb; |
| 294 | u8 *obuf; |
| 295 | int i, err; |
| 296 | size_t size = dev->adapter->tx_buffer_size; |
| 297 | |
| 298 | if (can_dropped_invalid_skb(netdev, skb)) |
| 299 | return NETDEV_TX_OK; |
| 300 | |
| 301 | for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) |
| 302 | if (dev->tx_contexts[i].echo_index == PCAN_USB_MAX_TX_URBS) { |
| 303 | context = dev->tx_contexts + i; |
| 304 | break; |
| 305 | } |
| 306 | |
| 307 | if (!context) { |
| 308 | /* should not occur except during restart */ |
| 309 | return NETDEV_TX_BUSY; |
| 310 | } |
| 311 | |
| 312 | urb = context->urb; |
| 313 | obuf = urb->transfer_buffer; |
| 314 | |
| 315 | err = dev->adapter->dev_encode_msg(dev, skb, obuf, &size); |
| 316 | if (err) { |
| 317 | if (net_ratelimit()) |
| 318 | netdev_err(netdev, "packet dropped\n"); |
| 319 | dev_kfree_skb(skb); |
| 320 | stats->tx_dropped++; |
| 321 | return NETDEV_TX_OK; |
| 322 | } |
| 323 | |
| 324 | context->echo_index = i; |
| 325 | context->dlc = cf->can_dlc; |
| 326 | |
| 327 | usb_anchor_urb(urb, &dev->tx_submitted); |
| 328 | |
| 329 | can_put_echo_skb(skb, netdev, context->echo_index); |
| 330 | |
| 331 | atomic_inc(&dev->active_tx_urbs); |
| 332 | |
| 333 | err = usb_submit_urb(urb, GFP_ATOMIC); |
| 334 | if (err) { |
| 335 | can_free_echo_skb(netdev, context->echo_index); |
| 336 | |
| 337 | usb_unanchor_urb(urb); |
| 338 | |
| 339 | /* this context is not used in fact */ |
| 340 | context->echo_index = PCAN_USB_MAX_TX_URBS; |
| 341 | |
| 342 | atomic_dec(&dev->active_tx_urbs); |
| 343 | |
| 344 | switch (err) { |
| 345 | case -ENODEV: |
| 346 | netif_device_detach(netdev); |
| 347 | break; |
| 348 | default: |
| 349 | netdev_warn(netdev, "tx urb submitting failed err=%d\n", |
| 350 | err); |
| 351 | case -ENOENT: |
| 352 | /* cable unplugged */ |
| 353 | stats->tx_dropped++; |
| 354 | } |
| 355 | } else { |
| 356 | netdev->trans_start = jiffies; |
| 357 | |
| 358 | /* slow down tx path */ |
| 359 | if (atomic_read(&dev->active_tx_urbs) >= PCAN_USB_MAX_TX_URBS) |
| 360 | netif_stop_queue(netdev); |
| 361 | } |
| 362 | |
| 363 | return NETDEV_TX_OK; |
| 364 | } |
| 365 | |
| 366 | /* |
| 367 | * start the CAN interface. |
| 368 | * Rx and Tx urbs are allocated here. Rx urbs are submitted here. |
| 369 | */ |
| 370 | static int peak_usb_start(struct peak_usb_device *dev) |
| 371 | { |
| 372 | struct net_device *netdev = dev->netdev; |
| 373 | int err, i; |
| 374 | |
| 375 | for (i = 0; i < PCAN_USB_MAX_RX_URBS; i++) { |
| 376 | struct urb *urb; |
| 377 | u8 *buf; |
| 378 | |
| 379 | /* create a URB, and a buffer for it, to receive usb messages */ |
| 380 | urb = usb_alloc_urb(0, GFP_KERNEL); |
| 381 | if (!urb) { |
| 382 | netdev_err(netdev, "No memory left for URBs\n"); |
| 383 | err = -ENOMEM; |
| 384 | break; |
| 385 | } |
| 386 | |
| 387 | buf = kmalloc(dev->adapter->rx_buffer_size, GFP_KERNEL); |
| 388 | if (!buf) { |
| 389 | netdev_err(netdev, "No memory left for USB buffer\n"); |
| 390 | usb_free_urb(urb); |
| 391 | err = -ENOMEM; |
| 392 | break; |
| 393 | } |
| 394 | |
| 395 | usb_fill_bulk_urb(urb, dev->udev, |
| 396 | usb_rcvbulkpipe(dev->udev, dev->ep_msg_in), |
| 397 | buf, dev->adapter->rx_buffer_size, |
| 398 | peak_usb_read_bulk_callback, dev); |
| 399 | |
| 400 | /* ask last usb_free_urb() to also kfree() transfer_buffer */ |
| 401 | urb->transfer_flags |= URB_FREE_BUFFER; |
| 402 | usb_anchor_urb(urb, &dev->rx_submitted); |
| 403 | |
| 404 | err = usb_submit_urb(urb, GFP_KERNEL); |
| 405 | if (err) { |
| 406 | if (err == -ENODEV) |
| 407 | netif_device_detach(dev->netdev); |
| 408 | |
| 409 | usb_unanchor_urb(urb); |
| 410 | kfree(buf); |
| 411 | usb_free_urb(urb); |
| 412 | break; |
| 413 | } |
| 414 | |
| 415 | /* drop reference, USB core will take care of freeing it */ |
| 416 | usb_free_urb(urb); |
| 417 | } |
| 418 | |
| 419 | /* did we submit any URBs? Warn if we was not able to submit all urbs */ |
| 420 | if (i < PCAN_USB_MAX_RX_URBS) { |
| 421 | if (i == 0) { |
| 422 | netdev_err(netdev, "couldn't setup any rx URB\n"); |
| 423 | return err; |
| 424 | } |
| 425 | |
| 426 | netdev_warn(netdev, "rx performance may be slow\n"); |
| 427 | } |
| 428 | |
| 429 | /* pre-alloc tx buffers and corresponding urbs */ |
| 430 | for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) { |
| 431 | struct peak_tx_urb_context *context; |
| 432 | struct urb *urb; |
| 433 | u8 *buf; |
| 434 | |
| 435 | /* create a URB and a buffer for it, to transmit usb messages */ |
| 436 | urb = usb_alloc_urb(0, GFP_KERNEL); |
| 437 | if (!urb) { |
| 438 | netdev_err(netdev, "No memory left for URBs\n"); |
| 439 | err = -ENOMEM; |
| 440 | break; |
| 441 | } |
| 442 | |
| 443 | buf = kmalloc(dev->adapter->tx_buffer_size, GFP_KERNEL); |
| 444 | if (!buf) { |
| 445 | netdev_err(netdev, "No memory left for USB buffer\n"); |
| 446 | usb_free_urb(urb); |
| 447 | err = -ENOMEM; |
| 448 | break; |
| 449 | } |
| 450 | |
| 451 | context = dev->tx_contexts + i; |
| 452 | context->dev = dev; |
| 453 | context->urb = urb; |
| 454 | |
| 455 | usb_fill_bulk_urb(urb, dev->udev, |
| 456 | usb_sndbulkpipe(dev->udev, dev->ep_msg_out), |
| 457 | buf, dev->adapter->tx_buffer_size, |
| 458 | peak_usb_write_bulk_callback, context); |
| 459 | |
| 460 | /* ask last usb_free_urb() to also kfree() transfer_buffer */ |
| 461 | urb->transfer_flags |= URB_FREE_BUFFER; |
| 462 | } |
| 463 | |
| 464 | /* warn if we were not able to allocate enough tx contexts */ |
| 465 | if (i < PCAN_USB_MAX_TX_URBS) { |
| 466 | if (i == 0) { |
| 467 | netdev_err(netdev, "couldn't setup any tx URB\n"); |
| 468 | return err; |
| 469 | } |
| 470 | |
| 471 | netdev_warn(netdev, "tx performance may be slow\n"); |
| 472 | } |
| 473 | |
| 474 | if (dev->adapter->dev_start) { |
| 475 | err = dev->adapter->dev_start(dev); |
| 476 | if (err) |
| 477 | goto failed; |
| 478 | } |
| 479 | |
| 480 | dev->state |= PCAN_USB_STATE_STARTED; |
| 481 | |
| 482 | /* can set bus on now */ |
| 483 | if (dev->adapter->dev_set_bus) { |
| 484 | err = dev->adapter->dev_set_bus(dev, 1); |
| 485 | if (err) |
| 486 | goto failed; |
| 487 | } |
| 488 | |
| 489 | dev->can.state = CAN_STATE_ERROR_ACTIVE; |
| 490 | |
| 491 | return 0; |
| 492 | |
| 493 | failed: |
| 494 | if (err == -ENODEV) |
| 495 | netif_device_detach(dev->netdev); |
| 496 | |
| 497 | netdev_warn(netdev, "couldn't submit control: %d\n", err); |
| 498 | |
| 499 | return err; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * called by netdev to open the corresponding CAN interface. |
| 504 | */ |
| 505 | static int peak_usb_ndo_open(struct net_device *netdev) |
| 506 | { |
| 507 | struct peak_usb_device *dev = netdev_priv(netdev); |
| 508 | int err; |
| 509 | |
| 510 | /* common open */ |
| 511 | err = open_candev(netdev); |
| 512 | if (err) |
| 513 | return err; |
| 514 | |
| 515 | /* finally start device */ |
| 516 | err = peak_usb_start(dev); |
| 517 | if (err) { |
| 518 | netdev_err(netdev, "couldn't start device: %d\n", err); |
| 519 | close_candev(netdev); |
| 520 | return err; |
| 521 | } |
| 522 | |
| 523 | dev->open_time = jiffies; |
| 524 | netif_start_queue(netdev); |
| 525 | |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | /* |
| 530 | * unlink in-flight Rx and Tx urbs and free their memory. |
| 531 | */ |
| 532 | static void peak_usb_unlink_all_urbs(struct peak_usb_device *dev) |
| 533 | { |
| 534 | int i; |
| 535 | |
| 536 | /* free all Rx (submitted) urbs */ |
| 537 | usb_kill_anchored_urbs(&dev->rx_submitted); |
| 538 | |
| 539 | /* free unsubmitted Tx urbs first */ |
| 540 | for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) { |
| 541 | struct urb *urb = dev->tx_contexts[i].urb; |
| 542 | |
| 543 | if (!urb || |
| 544 | dev->tx_contexts[i].echo_index != PCAN_USB_MAX_TX_URBS) { |
| 545 | /* |
| 546 | * this urb is already released or always submitted, |
| 547 | * let usb core free by itself |
| 548 | */ |
| 549 | continue; |
| 550 | } |
| 551 | |
| 552 | usb_free_urb(urb); |
| 553 | dev->tx_contexts[i].urb = NULL; |
| 554 | } |
| 555 | |
| 556 | /* then free all submitted Tx urbs */ |
| 557 | usb_kill_anchored_urbs(&dev->tx_submitted); |
| 558 | atomic_set(&dev->active_tx_urbs, 0); |
| 559 | } |
| 560 | |
| 561 | /* |
| 562 | * called by netdev to close the corresponding CAN interface. |
| 563 | */ |
| 564 | static int peak_usb_ndo_stop(struct net_device *netdev) |
| 565 | { |
| 566 | struct peak_usb_device *dev = netdev_priv(netdev); |
| 567 | |
| 568 | dev->state &= ~PCAN_USB_STATE_STARTED; |
| 569 | netif_stop_queue(netdev); |
| 570 | |
| 571 | /* unlink all pending urbs and free used memory */ |
| 572 | peak_usb_unlink_all_urbs(dev); |
| 573 | |
| 574 | if (dev->adapter->dev_stop) |
| 575 | dev->adapter->dev_stop(dev); |
| 576 | |
| 577 | close_candev(netdev); |
| 578 | |
| 579 | dev->open_time = 0; |
| 580 | dev->can.state = CAN_STATE_STOPPED; |
| 581 | |
| 582 | /* can set bus off now */ |
| 583 | if (dev->adapter->dev_set_bus) { |
| 584 | int err = dev->adapter->dev_set_bus(dev, 0); |
| 585 | if (err) |
| 586 | return err; |
| 587 | } |
| 588 | |
| 589 | return 0; |
| 590 | } |
| 591 | |
| 592 | /* |
| 593 | * handle end of waiting for the device to reset |
| 594 | */ |
| 595 | void peak_usb_restart_complete(struct peak_usb_device *dev) |
| 596 | { |
| 597 | /* finally MUST update can state */ |
| 598 | dev->can.state = CAN_STATE_ERROR_ACTIVE; |
| 599 | |
| 600 | /* netdev queue can be awaken now */ |
| 601 | netif_wake_queue(dev->netdev); |
| 602 | } |
| 603 | |
| 604 | void peak_usb_async_complete(struct urb *urb) |
| 605 | { |
| 606 | kfree(urb->transfer_buffer); |
| 607 | usb_free_urb(urb); |
| 608 | } |
| 609 | |
| 610 | /* |
| 611 | * device (auto-)restart mechanism runs in a timer context => |
| 612 | * MUST handle restart with asynchronous usb transfers |
| 613 | */ |
| 614 | static int peak_usb_restart(struct peak_usb_device *dev) |
| 615 | { |
| 616 | struct urb *urb; |
| 617 | int err; |
| 618 | u8 *buf; |
| 619 | |
| 620 | /* |
| 621 | * if device doesn't define any asynchronous restart handler, simply |
| 622 | * wake the netdev queue up |
| 623 | */ |
| 624 | if (!dev->adapter->dev_restart_async) { |
| 625 | peak_usb_restart_complete(dev); |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | /* first allocate a urb to handle the asynchronous steps */ |
| 630 | urb = usb_alloc_urb(0, GFP_ATOMIC); |
| 631 | if (!urb) { |
| 632 | netdev_err(dev->netdev, "no memory left for urb\n"); |
| 633 | return -ENOMEM; |
| 634 | } |
| 635 | |
| 636 | /* also allocate enough space for the commands to send */ |
| 637 | buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_ATOMIC); |
| 638 | if (!buf) { |
| 639 | netdev_err(dev->netdev, "no memory left for async cmd\n"); |
| 640 | usb_free_urb(urb); |
| 641 | return -ENOMEM; |
| 642 | } |
| 643 | |
| 644 | /* call the device specific handler for the restart */ |
| 645 | err = dev->adapter->dev_restart_async(dev, urb, buf); |
| 646 | if (!err) |
| 647 | return 0; |
| 648 | |
| 649 | kfree(buf); |
| 650 | usb_free_urb(urb); |
| 651 | |
| 652 | return err; |
| 653 | } |
| 654 | |
| 655 | /* |
| 656 | * candev callback used to change CAN mode. |
| 657 | * Warning: this is called from a timer context! |
| 658 | */ |
| 659 | static int peak_usb_set_mode(struct net_device *netdev, enum can_mode mode) |
| 660 | { |
| 661 | struct peak_usb_device *dev = netdev_priv(netdev); |
| 662 | int err = 0; |
| 663 | |
| 664 | if (!dev->open_time) |
| 665 | return -EINVAL; |
| 666 | |
| 667 | switch (mode) { |
| 668 | case CAN_MODE_START: |
| 669 | err = peak_usb_restart(dev); |
| 670 | if (err) |
| 671 | netdev_err(netdev, "couldn't start device (err %d)\n", |
| 672 | err); |
| 673 | break; |
| 674 | |
| 675 | default: |
| 676 | return -EOPNOTSUPP; |
| 677 | } |
| 678 | |
| 679 | return err; |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * candev callback used to set device bitrate. |
| 684 | */ |
| 685 | static int peak_usb_set_bittiming(struct net_device *netdev) |
| 686 | { |
| 687 | struct peak_usb_device *dev = netdev_priv(netdev); |
| 688 | struct can_bittiming *bt = &dev->can.bittiming; |
| 689 | |
| 690 | if (dev->adapter->dev_set_bittiming) { |
| 691 | int err = dev->adapter->dev_set_bittiming(dev, bt); |
| 692 | |
| 693 | if (err) |
| 694 | netdev_info(netdev, "couldn't set bitrate (err %d)\n", |
| 695 | err); |
| 696 | return err; |
| 697 | } |
| 698 | |
| 699 | return 0; |
| 700 | } |
| 701 | |
| 702 | static const struct net_device_ops peak_usb_netdev_ops = { |
| 703 | .ndo_open = peak_usb_ndo_open, |
| 704 | .ndo_stop = peak_usb_ndo_stop, |
| 705 | .ndo_start_xmit = peak_usb_ndo_start_xmit, |
| 706 | }; |
| 707 | |
| 708 | /* |
| 709 | * create one device which is attached to CAN controller #ctrl_idx of the |
| 710 | * usb adapter. |
| 711 | */ |
| 712 | static int peak_usb_create_dev(struct peak_usb_adapter *peak_usb_adapter, |
| 713 | struct usb_interface *intf, int ctrl_idx) |
| 714 | { |
| 715 | struct usb_device *usb_dev = interface_to_usbdev(intf); |
| 716 | int sizeof_candev = peak_usb_adapter->sizeof_dev_private; |
| 717 | struct peak_usb_device *dev; |
| 718 | struct net_device *netdev; |
| 719 | int i, err; |
| 720 | u16 tmp16; |
| 721 | |
| 722 | if (sizeof_candev < sizeof(struct peak_usb_device)) |
| 723 | sizeof_candev = sizeof(struct peak_usb_device); |
| 724 | |
| 725 | netdev = alloc_candev(sizeof_candev, PCAN_USB_MAX_TX_URBS); |
| 726 | if (!netdev) { |
| 727 | dev_err(&intf->dev, "%s: couldn't alloc candev\n", |
| 728 | PCAN_USB_DRIVER_NAME); |
| 729 | return -ENOMEM; |
| 730 | } |
| 731 | |
| 732 | dev = netdev_priv(netdev); |
| 733 | |
| 734 | /* allocate a buffer large enough to send commands */ |
| 735 | dev->cmd_buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL); |
| 736 | if (!dev->cmd_buf) { |
| 737 | dev_err(&intf->dev, "%s: couldn't alloc cmd buffer\n", |
| 738 | PCAN_USB_DRIVER_NAME); |
| 739 | err = -ENOMEM; |
| 740 | goto lbl_set_intf_data; |
| 741 | } |
| 742 | |
| 743 | dev->udev = usb_dev; |
| 744 | dev->netdev = netdev; |
| 745 | dev->adapter = peak_usb_adapter; |
| 746 | dev->ctrl_idx = ctrl_idx; |
| 747 | dev->state = PCAN_USB_STATE_CONNECTED; |
| 748 | |
| 749 | dev->ep_msg_in = peak_usb_adapter->ep_msg_in; |
| 750 | dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx]; |
| 751 | |
| 752 | dev->can.clock = peak_usb_adapter->clock; |
| 753 | dev->can.bittiming_const = &peak_usb_adapter->bittiming_const; |
| 754 | dev->can.do_set_bittiming = peak_usb_set_bittiming; |
| 755 | dev->can.do_set_mode = peak_usb_set_mode; |
| 756 | dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | |
| 757 | CAN_CTRLMODE_LISTENONLY; |
| 758 | |
| 759 | netdev->netdev_ops = &peak_usb_netdev_ops; |
| 760 | |
| 761 | netdev->flags |= IFF_ECHO; /* we support local echo */ |
| 762 | |
| 763 | init_usb_anchor(&dev->rx_submitted); |
| 764 | |
| 765 | init_usb_anchor(&dev->tx_submitted); |
| 766 | atomic_set(&dev->active_tx_urbs, 0); |
| 767 | |
| 768 | for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) |
| 769 | dev->tx_contexts[i].echo_index = PCAN_USB_MAX_TX_URBS; |
| 770 | |
| 771 | dev->prev_siblings = usb_get_intfdata(intf); |
| 772 | usb_set_intfdata(intf, dev); |
| 773 | |
| 774 | SET_NETDEV_DEV(netdev, &intf->dev); |
| 775 | |
| 776 | err = register_candev(netdev); |
| 777 | if (err) { |
| 778 | dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); |
| 779 | goto lbl_free_cmd_buf; |
| 780 | } |
| 781 | |
| 782 | if (dev->prev_siblings) |
| 783 | (dev->prev_siblings)->next_siblings = dev; |
| 784 | |
| 785 | /* keep hw revision into the netdevice */ |
| 786 | tmp16 = le16_to_cpu(usb_dev->descriptor.bcdDevice); |
| 787 | dev->device_rev = tmp16 >> 8; |
| 788 | |
| 789 | if (dev->adapter->dev_init) { |
| 790 | err = dev->adapter->dev_init(dev); |
| 791 | if (err) |
| 792 | goto lbl_free_cmd_buf; |
| 793 | } |
| 794 | |
| 795 | /* set bus off */ |
| 796 | if (dev->adapter->dev_set_bus) { |
| 797 | err = dev->adapter->dev_set_bus(dev, 0); |
| 798 | if (err) |
| 799 | goto lbl_free_cmd_buf; |
| 800 | } |
| 801 | |
| 802 | /* get device number early */ |
| 803 | if (dev->adapter->dev_get_device_id) |
| 804 | dev->adapter->dev_get_device_id(dev, &dev->device_number); |
| 805 | |
| 806 | netdev_info(netdev, "attached to %s channel %u (device %u)\n", |
| 807 | peak_usb_adapter->name, ctrl_idx, dev->device_number); |
| 808 | |
| 809 | return 0; |
| 810 | |
| 811 | lbl_free_cmd_buf: |
| 812 | kfree(dev->cmd_buf); |
| 813 | |
| 814 | lbl_set_intf_data: |
| 815 | usb_set_intfdata(intf, dev->prev_siblings); |
| 816 | free_candev(netdev); |
| 817 | |
| 818 | return err; |
| 819 | } |
| 820 | |
| 821 | /* |
| 822 | * called by the usb core when the device is unplugged from the system |
| 823 | */ |
| 824 | static void peak_usb_disconnect(struct usb_interface *intf) |
| 825 | { |
| 826 | struct peak_usb_device *dev; |
| 827 | |
| 828 | /* unregister as many netdev devices as siblings */ |
| 829 | for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) { |
| 830 | struct net_device *netdev = dev->netdev; |
| 831 | char name[IFNAMSIZ]; |
| 832 | |
| 833 | dev->state &= ~PCAN_USB_STATE_CONNECTED; |
| 834 | strncpy(name, netdev->name, IFNAMSIZ); |
| 835 | |
| 836 | unregister_netdev(netdev); |
| 837 | free_candev(netdev); |
| 838 | |
| 839 | kfree(dev->cmd_buf); |
| 840 | dev->next_siblings = NULL; |
| 841 | if (dev->adapter->dev_free) |
| 842 | dev->adapter->dev_free(dev); |
| 843 | |
| 844 | dev_info(&intf->dev, "%s removed\n", name); |
| 845 | } |
| 846 | |
| 847 | usb_set_intfdata(intf, NULL); |
| 848 | } |
| 849 | |
| 850 | /* |
| 851 | * probe function for new PEAK-System devices |
| 852 | */ |
| 853 | static int peak_usb_probe(struct usb_interface *intf, |
| 854 | const struct usb_device_id *id) |
| 855 | { |
| 856 | struct usb_device *usb_dev = interface_to_usbdev(intf); |
| 857 | struct peak_usb_adapter *peak_usb_adapter, **pp; |
| 858 | int i, err = -ENOMEM; |
| 859 | |
| 860 | usb_dev = interface_to_usbdev(intf); |
| 861 | |
| 862 | /* get corresponding PCAN-USB adapter */ |
| 863 | for (pp = peak_usb_adapters_list; *pp; pp++) |
| 864 | if ((*pp)->device_id == usb_dev->descriptor.idProduct) |
| 865 | break; |
| 866 | |
| 867 | peak_usb_adapter = *pp; |
| 868 | if (!peak_usb_adapter) { |
| 869 | /* should never come except device_id bad usage in this file */ |
| 870 | pr_err("%s: didn't find device id. 0x%x in devices list\n", |
| 871 | PCAN_USB_DRIVER_NAME, usb_dev->descriptor.idProduct); |
| 872 | return -ENODEV; |
| 873 | } |
| 874 | |
| 875 | /* got corresponding adapter: check if it handles current interface */ |
| 876 | if (peak_usb_adapter->intf_probe) { |
| 877 | err = peak_usb_adapter->intf_probe(intf); |
| 878 | if (err) |
| 879 | return err; |
| 880 | } |
| 881 | |
| 882 | for (i = 0; i < peak_usb_adapter->ctrl_count; i++) { |
| 883 | err = peak_usb_create_dev(peak_usb_adapter, intf, i); |
| 884 | if (err) { |
| 885 | /* deregister already created devices */ |
| 886 | peak_usb_disconnect(intf); |
| 887 | break; |
| 888 | } |
| 889 | } |
| 890 | |
| 891 | return err; |
| 892 | } |
| 893 | |
| 894 | /* usb specific object needed to register this driver with the usb subsystem */ |
| 895 | static struct usb_driver peak_usb_driver = { |
| 896 | .name = PCAN_USB_DRIVER_NAME, |
| 897 | .disconnect = peak_usb_disconnect, |
| 898 | .probe = peak_usb_probe, |
| 899 | .id_table = peak_usb_table, |
| 900 | }; |
| 901 | |
| 902 | static int __init peak_usb_init(void) |
| 903 | { |
| 904 | int err; |
| 905 | |
| 906 | /* register this driver with the USB subsystem */ |
| 907 | err = usb_register(&peak_usb_driver); |
| 908 | if (err) |
| 909 | pr_err("%s: usb_register failed (err %d)\n", |
| 910 | PCAN_USB_DRIVER_NAME, err); |
| 911 | |
| 912 | return err; |
| 913 | } |
| 914 | |
| 915 | static int peak_usb_do_device_exit(struct device *d, void *arg) |
| 916 | { |
| 917 | struct usb_interface *intf = to_usb_interface(d); |
| 918 | struct peak_usb_device *dev; |
| 919 | |
| 920 | /* stop as many netdev devices as siblings */ |
| 921 | for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) { |
| 922 | struct net_device *netdev = dev->netdev; |
| 923 | |
| 924 | if (netif_device_present(netdev)) |
| 925 | if (dev->adapter->dev_exit) |
| 926 | dev->adapter->dev_exit(dev); |
| 927 | } |
| 928 | |
| 929 | return 0; |
| 930 | } |
| 931 | |
| 932 | static void __exit peak_usb_exit(void) |
| 933 | { |
| 934 | int err; |
| 935 | |
| 936 | /* last chance do send any synchronous commands here */ |
| 937 | err = driver_for_each_device(&peak_usb_driver.drvwrap.driver, NULL, |
| 938 | NULL, peak_usb_do_device_exit); |
| 939 | if (err) |
| 940 | pr_err("%s: failed to stop all can devices (err %d)\n", |
| 941 | PCAN_USB_DRIVER_NAME, err); |
| 942 | |
| 943 | /* deregister this driver with the USB subsystem */ |
| 944 | usb_deregister(&peak_usb_driver); |
| 945 | |
| 946 | pr_info("%s: PCAN-USB interfaces driver unloaded\n", |
| 947 | PCAN_USB_DRIVER_NAME); |
| 948 | } |
| 949 | |
| 950 | module_init(peak_usb_init); |
| 951 | module_exit(peak_usb_exit); |