1 // SPDX-License-Identifier: GPL-2.0
2 /* Parts of this driver are based on the following:
3 * - Kvaser linux leaf driver (version 4.78)
4 * - CAN driver for esd CAN-USB/2
5 * - Kvaser linux usbcanII driver (version 5.3)
6 * - Kvaser linux mhydra driver (version 5.24)
7 *
8 * Copyright (C) 2002-2018 KVASER AB, Sweden. All rights reserved.
9 * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
10 * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
11 * Copyright (C) 2015 Valeo S.A.
12 */
13
14 #include <linux/completion.h>
15 #include <linux/device.h>
16 #include <linux/gfp.h>
17 #include <linux/if.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/netdevice.h>
21 #include <linux/spinlock.h>
22 #include <linux/types.h>
23 #include <linux/usb.h>
24
25 #include <linux/can.h>
26 #include <linux/can/dev.h>
27 #include <linux/can/error.h>
28 #include <linux/can/netlink.h>
29
30 #include "kvaser_usb.h"
31
32 /* Kvaser USB vendor id. */
33 #define KVASER_VENDOR_ID 0x0bfd
34
35 /* Kvaser Leaf USB devices product ids */
36 #define USB_LEAF_DEVEL_PRODUCT_ID 10
37 #define USB_LEAF_LITE_PRODUCT_ID 11
38 #define USB_LEAF_PRO_PRODUCT_ID 12
39 #define USB_LEAF_SPRO_PRODUCT_ID 14
40 #define USB_LEAF_PRO_LS_PRODUCT_ID 15
41 #define USB_LEAF_PRO_SWC_PRODUCT_ID 16
42 #define USB_LEAF_PRO_LIN_PRODUCT_ID 17
43 #define USB_LEAF_SPRO_LS_PRODUCT_ID 18
44 #define USB_LEAF_SPRO_SWC_PRODUCT_ID 19
45 #define USB_MEMO2_DEVEL_PRODUCT_ID 22
46 #define USB_MEMO2_HSHS_PRODUCT_ID 23
47 #define USB_UPRO_HSHS_PRODUCT_ID 24
48 #define USB_LEAF_LITE_GI_PRODUCT_ID 25
49 #define USB_LEAF_PRO_OBDII_PRODUCT_ID 26
50 #define USB_MEMO2_HSLS_PRODUCT_ID 27
51 #define USB_LEAF_LITE_CH_PRODUCT_ID 28
52 #define USB_BLACKBIRD_SPRO_PRODUCT_ID 29
53 #define USB_OEM_MERCURY_PRODUCT_ID 34
54 #define USB_OEM_LEAF_PRODUCT_ID 35
55 #define USB_CAN_R_PRODUCT_ID 39
56 #define USB_LEAF_LITE_V2_PRODUCT_ID 288
57 #define USB_MINI_PCIE_HS_PRODUCT_ID 289
58 #define USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID 290
59 #define USB_USBCAN_LIGHT_2HS_PRODUCT_ID 291
60 #define USB_MINI_PCIE_2HS_PRODUCT_ID 292
61
62 /* Kvaser USBCan-II devices product ids */
63 #define USB_USBCAN_REVB_PRODUCT_ID 2
64 #define USB_VCI2_PRODUCT_ID 3
65 #define USB_USBCAN2_PRODUCT_ID 4
66 #define USB_MEMORATOR_PRODUCT_ID 5
67
68 /* Kvaser Minihydra USB devices product ids */
69 #define USB_BLACKBIRD_V2_PRODUCT_ID 258
70 #define USB_MEMO_PRO_5HS_PRODUCT_ID 260
71 #define USB_USBCAN_PRO_5HS_PRODUCT_ID 261
72 #define USB_USBCAN_LIGHT_4HS_PRODUCT_ID 262
73 #define USB_LEAF_PRO_HS_V2_PRODUCT_ID 263
74 #define USB_USBCAN_PRO_2HS_V2_PRODUCT_ID 264
75 #define USB_MEMO_2HS_PRODUCT_ID 265
76 #define USB_MEMO_PRO_2HS_V2_PRODUCT_ID 266
77 #define USB_HYBRID_CANLIN_PRODUCT_ID 267
78 #define USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID 268
79 #define USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID 269
80 #define USB_HYBRID_PRO_CANLIN_PRODUCT_ID 270
81
82 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_hydra = {
83 .quirks = 0,
84 .ops = &kvaser_usb_hydra_dev_ops,
85 };
86
87 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_usbcan = {
88 .quirks = KVASER_USB_QUIRK_HAS_TXRX_ERRORS |
89 KVASER_USB_QUIRK_HAS_SILENT_MODE,
90 .family = KVASER_USBCAN,
91 .ops = &kvaser_usb_leaf_dev_ops,
92 };
93
94 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leaf = {
95 .quirks = KVASER_USB_QUIRK_IGNORE_CLK_FREQ,
96 .family = KVASER_LEAF,
97 .ops = &kvaser_usb_leaf_dev_ops,
98 };
99
100 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leaf_err = {
101 .quirks = KVASER_USB_QUIRK_HAS_TXRX_ERRORS |
102 KVASER_USB_QUIRK_IGNORE_CLK_FREQ,
103 .family = KVASER_LEAF,
104 .ops = &kvaser_usb_leaf_dev_ops,
105 };
106
107 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leaf_err_listen = {
108 .quirks = KVASER_USB_QUIRK_HAS_TXRX_ERRORS |
109 KVASER_USB_QUIRK_HAS_SILENT_MODE |
110 KVASER_USB_QUIRK_IGNORE_CLK_FREQ,
111 .family = KVASER_LEAF,
112 .ops = &kvaser_usb_leaf_dev_ops,
113 };
114
115 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leafimx = {
116 .quirks = 0,
117 .ops = &kvaser_usb_leaf_dev_ops,
118 };
119
120 static const struct usb_device_id kvaser_usb_table[] = {
121 /* Leaf M32C USB product IDs */
122 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID),
123 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf },
124 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID),
125 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf },
126 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
127 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
128 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
129 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
130 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
131 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
132 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
133 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
134 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
135 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
136 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
137 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
138 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
139 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
140 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
141 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
142 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
143 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
144 { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
145 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
146 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID),
147 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf },
148 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
149 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
150 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
151 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
152 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
153 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
154 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
155 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
156 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
157 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
158 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
159 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
160 { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
161 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
162
163 /* Leaf i.MX28 USB product IDs */
164 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID),
165 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
166 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID),
167 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
168 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID),
169 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
170 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID),
171 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
172 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID),
173 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
174
175 /* USBCANII USB product IDs */
176 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
177 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
178 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
179 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
180 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
181 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
182 { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
183 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
184
185 /* Minihydra USB product IDs */
186 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_V2_PRODUCT_ID),
187 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
188 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_5HS_PRODUCT_ID),
189 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
190 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_5HS_PRODUCT_ID),
191 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
192 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_4HS_PRODUCT_ID),
193 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
194 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_HS_V2_PRODUCT_ID),
195 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
196 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_2HS_V2_PRODUCT_ID),
197 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
198 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_2HS_PRODUCT_ID),
199 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
200 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_2HS_V2_PRODUCT_ID),
201 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
202 { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_CANLIN_PRODUCT_ID),
203 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
204 { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID),
205 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
206 { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID),
207 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
208 { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_PRO_CANLIN_PRODUCT_ID),
209 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
210 { }
211 };
212 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
213
kvaser_usb_send_cmd(const struct kvaser_usb * dev,void * cmd,int len)214 int kvaser_usb_send_cmd(const struct kvaser_usb *dev, void *cmd, int len)
215 {
216 int actual_len; /* Not used */
217
218 return usb_bulk_msg(dev->udev,
219 usb_sndbulkpipe(dev->udev,
220 dev->bulk_out->bEndpointAddress),
221 cmd, len, &actual_len, KVASER_USB_TIMEOUT);
222 }
223
kvaser_usb_recv_cmd(const struct kvaser_usb * dev,void * cmd,int len,int * actual_len)224 int kvaser_usb_recv_cmd(const struct kvaser_usb *dev, void *cmd, int len,
225 int *actual_len)
226 {
227 return usb_bulk_msg(dev->udev,
228 usb_rcvbulkpipe(dev->udev,
229 dev->bulk_in->bEndpointAddress),
230 cmd, len, actual_len, KVASER_USB_TIMEOUT);
231 }
232
kvaser_usb_send_cmd_callback(struct urb * urb)233 static void kvaser_usb_send_cmd_callback(struct urb *urb)
234 {
235 struct net_device *netdev = urb->context;
236
237 kfree(urb->transfer_buffer);
238
239 if (urb->status)
240 netdev_warn(netdev, "urb status received: %d\n", urb->status);
241 }
242
kvaser_usb_send_cmd_async(struct kvaser_usb_net_priv * priv,void * cmd,int len)243 int kvaser_usb_send_cmd_async(struct kvaser_usb_net_priv *priv, void *cmd,
244 int len)
245 {
246 struct kvaser_usb *dev = priv->dev;
247 struct net_device *netdev = priv->netdev;
248 struct urb *urb;
249 int err;
250
251 urb = usb_alloc_urb(0, GFP_ATOMIC);
252 if (!urb)
253 return -ENOMEM;
254
255 usb_fill_bulk_urb(urb, dev->udev,
256 usb_sndbulkpipe(dev->udev,
257 dev->bulk_out->bEndpointAddress),
258 cmd, len, kvaser_usb_send_cmd_callback, netdev);
259 usb_anchor_urb(urb, &priv->tx_submitted);
260
261 err = usb_submit_urb(urb, GFP_ATOMIC);
262 if (err) {
263 netdev_err(netdev, "Error transmitting URB\n");
264 usb_unanchor_urb(urb);
265 }
266 usb_free_urb(urb);
267
268 return 0;
269 }
270
kvaser_usb_can_rx_over_error(struct net_device * netdev)271 int kvaser_usb_can_rx_over_error(struct net_device *netdev)
272 {
273 struct net_device_stats *stats = &netdev->stats;
274 struct can_frame *cf;
275 struct sk_buff *skb;
276
277 stats->rx_over_errors++;
278 stats->rx_errors++;
279
280 skb = alloc_can_err_skb(netdev, &cf);
281 if (!skb) {
282 stats->rx_dropped++;
283 netdev_warn(netdev, "No memory left for err_skb\n");
284 return -ENOMEM;
285 }
286
287 cf->can_id |= CAN_ERR_CRTL;
288 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
289
290 stats->rx_packets++;
291 stats->rx_bytes += cf->can_dlc;
292 netif_rx(skb);
293
294 return 0;
295 }
296
kvaser_usb_read_bulk_callback(struct urb * urb)297 static void kvaser_usb_read_bulk_callback(struct urb *urb)
298 {
299 struct kvaser_usb *dev = urb->context;
300 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
301 int err;
302 unsigned int i;
303
304 switch (urb->status) {
305 case 0:
306 break;
307 case -ENOENT:
308 case -EPIPE:
309 case -EPROTO:
310 case -ESHUTDOWN:
311 return;
312 default:
313 dev_info(&dev->intf->dev, "Rx URB aborted (%d)\n", urb->status);
314 goto resubmit_urb;
315 }
316
317 ops->dev_read_bulk_callback(dev, urb->transfer_buffer,
318 urb->actual_length);
319
320 resubmit_urb:
321 usb_fill_bulk_urb(urb, dev->udev,
322 usb_rcvbulkpipe(dev->udev,
323 dev->bulk_in->bEndpointAddress),
324 urb->transfer_buffer, KVASER_USB_RX_BUFFER_SIZE,
325 kvaser_usb_read_bulk_callback, dev);
326
327 err = usb_submit_urb(urb, GFP_ATOMIC);
328 if (err == -ENODEV) {
329 for (i = 0; i < dev->nchannels; i++) {
330 if (!dev->nets[i])
331 continue;
332
333 netif_device_detach(dev->nets[i]->netdev);
334 }
335 } else if (err) {
336 dev_err(&dev->intf->dev,
337 "Failed resubmitting read bulk urb: %d\n", err);
338 }
339 }
340
kvaser_usb_setup_rx_urbs(struct kvaser_usb * dev)341 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
342 {
343 int i, err = 0;
344
345 if (dev->rxinitdone)
346 return 0;
347
348 for (i = 0; i < KVASER_USB_MAX_RX_URBS; i++) {
349 struct urb *urb = NULL;
350 u8 *buf = NULL;
351 dma_addr_t buf_dma;
352
353 urb = usb_alloc_urb(0, GFP_KERNEL);
354 if (!urb) {
355 err = -ENOMEM;
356 break;
357 }
358
359 buf = usb_alloc_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE,
360 GFP_KERNEL, &buf_dma);
361 if (!buf) {
362 dev_warn(&dev->intf->dev,
363 "No memory left for USB buffer\n");
364 usb_free_urb(urb);
365 err = -ENOMEM;
366 break;
367 }
368
369 usb_fill_bulk_urb(urb, dev->udev,
370 usb_rcvbulkpipe
371 (dev->udev,
372 dev->bulk_in->bEndpointAddress),
373 buf, KVASER_USB_RX_BUFFER_SIZE,
374 kvaser_usb_read_bulk_callback, dev);
375 urb->transfer_dma = buf_dma;
376 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
377 usb_anchor_urb(urb, &dev->rx_submitted);
378
379 err = usb_submit_urb(urb, GFP_KERNEL);
380 if (err) {
381 usb_unanchor_urb(urb);
382 usb_free_coherent(dev->udev,
383 KVASER_USB_RX_BUFFER_SIZE, buf,
384 buf_dma);
385 usb_free_urb(urb);
386 break;
387 }
388
389 dev->rxbuf[i] = buf;
390 dev->rxbuf_dma[i] = buf_dma;
391
392 usb_free_urb(urb);
393 }
394
395 if (i == 0) {
396 dev_warn(&dev->intf->dev, "Cannot setup read URBs, error %d\n",
397 err);
398 return err;
399 } else if (i < KVASER_USB_MAX_RX_URBS) {
400 dev_warn(&dev->intf->dev, "RX performances may be slow\n");
401 }
402
403 dev->rxinitdone = true;
404
405 return 0;
406 }
407
kvaser_usb_open(struct net_device * netdev)408 static int kvaser_usb_open(struct net_device *netdev)
409 {
410 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
411 struct kvaser_usb *dev = priv->dev;
412 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
413 int err;
414
415 err = open_candev(netdev);
416 if (err)
417 return err;
418
419 err = kvaser_usb_setup_rx_urbs(dev);
420 if (err)
421 goto error;
422
423 err = ops->dev_set_opt_mode(priv);
424 if (err)
425 goto error;
426
427 err = ops->dev_start_chip(priv);
428 if (err) {
429 netdev_warn(netdev, "Cannot start device, error %d\n", err);
430 goto error;
431 }
432
433 priv->can.state = CAN_STATE_ERROR_ACTIVE;
434
435 return 0;
436
437 error:
438 close_candev(netdev);
439 return err;
440 }
441
kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv * priv)442 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
443 {
444 int i, max_tx_urbs;
445
446 max_tx_urbs = priv->dev->max_tx_urbs;
447
448 priv->active_tx_contexts = 0;
449 for (i = 0; i < max_tx_urbs; i++)
450 priv->tx_contexts[i].echo_index = max_tx_urbs;
451 }
452
453 /* This method might sleep. Do not call it in the atomic context
454 * of URB completions.
455 */
kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv * priv)456 void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
457 {
458 usb_kill_anchored_urbs(&priv->tx_submitted);
459 kvaser_usb_reset_tx_urb_contexts(priv);
460 }
461
kvaser_usb_unlink_all_urbs(struct kvaser_usb * dev)462 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
463 {
464 int i;
465
466 usb_kill_anchored_urbs(&dev->rx_submitted);
467
468 for (i = 0; i < KVASER_USB_MAX_RX_URBS; i++)
469 usb_free_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE,
470 dev->rxbuf[i], dev->rxbuf_dma[i]);
471
472 for (i = 0; i < dev->nchannels; i++) {
473 struct kvaser_usb_net_priv *priv = dev->nets[i];
474
475 if (priv)
476 kvaser_usb_unlink_tx_urbs(priv);
477 }
478 }
479
kvaser_usb_close(struct net_device * netdev)480 static int kvaser_usb_close(struct net_device *netdev)
481 {
482 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
483 struct kvaser_usb *dev = priv->dev;
484 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
485 int err;
486
487 netif_stop_queue(netdev);
488
489 err = ops->dev_flush_queue(priv);
490 if (err)
491 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
492
493 if (ops->dev_reset_chip) {
494 err = ops->dev_reset_chip(dev, priv->channel);
495 if (err)
496 netdev_warn(netdev, "Cannot reset card, error %d\n",
497 err);
498 }
499
500 err = ops->dev_stop_chip(priv);
501 if (err)
502 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
503
504 /* reset tx contexts */
505 kvaser_usb_unlink_tx_urbs(priv);
506
507 priv->can.state = CAN_STATE_STOPPED;
508 close_candev(priv->netdev);
509
510 return 0;
511 }
512
kvaser_usb_write_bulk_callback(struct urb * urb)513 static void kvaser_usb_write_bulk_callback(struct urb *urb)
514 {
515 struct kvaser_usb_tx_urb_context *context = urb->context;
516 struct kvaser_usb_net_priv *priv;
517 struct net_device *netdev;
518
519 if (WARN_ON(!context))
520 return;
521
522 priv = context->priv;
523 netdev = priv->netdev;
524
525 kfree(urb->transfer_buffer);
526
527 if (!netif_device_present(netdev))
528 return;
529
530 if (urb->status)
531 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
532 }
533
kvaser_usb_start_xmit(struct sk_buff * skb,struct net_device * netdev)534 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
535 struct net_device *netdev)
536 {
537 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
538 struct kvaser_usb *dev = priv->dev;
539 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
540 struct net_device_stats *stats = &netdev->stats;
541 struct kvaser_usb_tx_urb_context *context = NULL;
542 struct urb *urb;
543 void *buf;
544 int cmd_len = 0;
545 int err, ret = NETDEV_TX_OK;
546 unsigned int i;
547 unsigned long flags;
548
549 if (can_dropped_invalid_skb(netdev, skb))
550 return NETDEV_TX_OK;
551
552 urb = usb_alloc_urb(0, GFP_ATOMIC);
553 if (!urb) {
554 stats->tx_dropped++;
555 dev_kfree_skb(skb);
556 return NETDEV_TX_OK;
557 }
558
559 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
560 for (i = 0; i < dev->max_tx_urbs; i++) {
561 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
562 context = &priv->tx_contexts[i];
563
564 context->echo_index = i;
565 ++priv->active_tx_contexts;
566 if (priv->active_tx_contexts >= (int)dev->max_tx_urbs)
567 netif_stop_queue(netdev);
568
569 break;
570 }
571 }
572 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
573
574 /* This should never happen; it implies a flow control bug */
575 if (!context) {
576 netdev_warn(netdev, "cannot find free context\n");
577
578 ret = NETDEV_TX_BUSY;
579 goto freeurb;
580 }
581
582 buf = ops->dev_frame_to_cmd(priv, skb, &context->dlc, &cmd_len,
583 context->echo_index);
584 if (!buf) {
585 stats->tx_dropped++;
586 dev_kfree_skb(skb);
587 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
588
589 context->echo_index = dev->max_tx_urbs;
590 --priv->active_tx_contexts;
591 netif_wake_queue(netdev);
592
593 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
594 goto freeurb;
595 }
596
597 context->priv = priv;
598
599 can_put_echo_skb(skb, netdev, context->echo_index);
600
601 usb_fill_bulk_urb(urb, dev->udev,
602 usb_sndbulkpipe(dev->udev,
603 dev->bulk_out->bEndpointAddress),
604 buf, cmd_len, kvaser_usb_write_bulk_callback,
605 context);
606 usb_anchor_urb(urb, &priv->tx_submitted);
607
608 err = usb_submit_urb(urb, GFP_ATOMIC);
609 if (unlikely(err)) {
610 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
611
612 can_free_echo_skb(netdev, context->echo_index);
613 context->echo_index = dev->max_tx_urbs;
614 --priv->active_tx_contexts;
615 netif_wake_queue(netdev);
616
617 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
618
619 usb_unanchor_urb(urb);
620 kfree(buf);
621
622 stats->tx_dropped++;
623
624 if (err == -ENODEV)
625 netif_device_detach(netdev);
626 else
627 netdev_warn(netdev, "Failed tx_urb %d\n", err);
628
629 goto freeurb;
630 }
631
632 ret = NETDEV_TX_OK;
633
634 freeurb:
635 usb_free_urb(urb);
636 return ret;
637 }
638
639 static const struct net_device_ops kvaser_usb_netdev_ops = {
640 .ndo_open = kvaser_usb_open,
641 .ndo_stop = kvaser_usb_close,
642 .ndo_start_xmit = kvaser_usb_start_xmit,
643 .ndo_change_mtu = can_change_mtu,
644 };
645
kvaser_usb_remove_interfaces(struct kvaser_usb * dev)646 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
647 {
648 int i;
649
650 for (i = 0; i < dev->nchannels; i++) {
651 if (!dev->nets[i])
652 continue;
653
654 unregister_candev(dev->nets[i]->netdev);
655 }
656
657 kvaser_usb_unlink_all_urbs(dev);
658
659 for (i = 0; i < dev->nchannels; i++) {
660 if (!dev->nets[i])
661 continue;
662
663 free_candev(dev->nets[i]->netdev);
664 }
665 }
666
kvaser_usb_init_one(struct kvaser_usb * dev,int channel)667 static int kvaser_usb_init_one(struct kvaser_usb *dev, int channel)
668 {
669 struct net_device *netdev;
670 struct kvaser_usb_net_priv *priv;
671 const struct kvaser_usb_driver_info *driver_info = dev->driver_info;
672 const struct kvaser_usb_dev_ops *ops = driver_info->ops;
673 int err;
674
675 if (ops->dev_reset_chip) {
676 err = ops->dev_reset_chip(dev, channel);
677 if (err)
678 return err;
679 }
680
681 netdev = alloc_candev(struct_size(priv, tx_contexts, dev->max_tx_urbs),
682 dev->max_tx_urbs);
683 if (!netdev) {
684 dev_err(&dev->intf->dev, "Cannot alloc candev\n");
685 return -ENOMEM;
686 }
687
688 priv = netdev_priv(netdev);
689
690 init_usb_anchor(&priv->tx_submitted);
691 init_completion(&priv->start_comp);
692 init_completion(&priv->stop_comp);
693 init_completion(&priv->flush_comp);
694 priv->can.ctrlmode_supported = 0;
695
696 priv->dev = dev;
697 priv->netdev = netdev;
698 priv->channel = channel;
699
700 spin_lock_init(&priv->tx_contexts_lock);
701 kvaser_usb_reset_tx_urb_contexts(priv);
702
703 priv->can.state = CAN_STATE_STOPPED;
704 priv->can.clock.freq = dev->cfg->clock.freq;
705 priv->can.bittiming_const = dev->cfg->bittiming_const;
706 priv->can.do_set_bittiming = ops->dev_set_bittiming;
707 priv->can.do_set_mode = ops->dev_set_mode;
708 if ((driver_info->quirks & KVASER_USB_QUIRK_HAS_TXRX_ERRORS) ||
709 (priv->dev->card_data.capabilities & KVASER_USB_CAP_BERR_CAP))
710 priv->can.do_get_berr_counter = ops->dev_get_berr_counter;
711 if (driver_info->quirks & KVASER_USB_QUIRK_HAS_SILENT_MODE)
712 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
713
714 priv->can.ctrlmode_supported |= dev->card_data.ctrlmode_supported;
715
716 if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
717 priv->can.data_bittiming_const = dev->cfg->data_bittiming_const;
718 priv->can.do_set_data_bittiming = ops->dev_set_data_bittiming;
719 }
720
721 netdev->flags |= IFF_ECHO;
722
723 netdev->netdev_ops = &kvaser_usb_netdev_ops;
724
725 SET_NETDEV_DEV(netdev, &dev->intf->dev);
726 netdev->dev_id = channel;
727
728 dev->nets[channel] = priv;
729
730 err = register_candev(netdev);
731 if (err) {
732 dev_err(&dev->intf->dev, "Failed to register CAN device\n");
733 free_candev(netdev);
734 dev->nets[channel] = NULL;
735 return err;
736 }
737
738 netdev_dbg(netdev, "device registered\n");
739
740 return 0;
741 }
742
kvaser_usb_probe(struct usb_interface * intf,const struct usb_device_id * id)743 static int kvaser_usb_probe(struct usb_interface *intf,
744 const struct usb_device_id *id)
745 {
746 struct kvaser_usb *dev;
747 int err;
748 int i;
749 const struct kvaser_usb_driver_info *driver_info;
750 const struct kvaser_usb_dev_ops *ops;
751
752 driver_info = (const struct kvaser_usb_driver_info *)id->driver_info;
753 if (!driver_info)
754 return -ENODEV;
755
756 dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
757 if (!dev)
758 return -ENOMEM;
759
760 dev->intf = intf;
761 dev->driver_info = driver_info;
762 ops = driver_info->ops;
763
764 err = ops->dev_setup_endpoints(dev);
765 if (err) {
766 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
767 return err;
768 }
769
770 dev->udev = interface_to_usbdev(intf);
771
772 init_usb_anchor(&dev->rx_submitted);
773
774 usb_set_intfdata(intf, dev);
775
776 dev->card_data.ctrlmode_supported = 0;
777 dev->card_data.capabilities = 0;
778 err = ops->dev_init_card(dev);
779 if (err) {
780 dev_err(&intf->dev,
781 "Failed to initialize card, error %d\n", err);
782 return err;
783 }
784
785 err = ops->dev_get_software_info(dev);
786 if (err) {
787 dev_err(&intf->dev,
788 "Cannot get software info, error %d\n", err);
789 return err;
790 }
791
792 if (ops->dev_get_software_details) {
793 err = ops->dev_get_software_details(dev);
794 if (err) {
795 dev_err(&intf->dev,
796 "Cannot get software details, error %d\n", err);
797 return err;
798 }
799 }
800
801 if (WARN_ON(!dev->cfg))
802 return -ENODEV;
803
804 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
805 ((dev->fw_version >> 24) & 0xff),
806 ((dev->fw_version >> 16) & 0xff),
807 (dev->fw_version & 0xffff));
808
809 dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);
810
811 err = ops->dev_get_card_info(dev);
812 if (err) {
813 dev_err(&intf->dev, "Cannot get card info, error %d\n", err);
814 return err;
815 }
816
817 if (ops->dev_get_capabilities) {
818 err = ops->dev_get_capabilities(dev);
819 if (err) {
820 dev_err(&intf->dev,
821 "Cannot get capabilities, error %d\n", err);
822 kvaser_usb_remove_interfaces(dev);
823 return err;
824 }
825 }
826
827 for (i = 0; i < dev->nchannels; i++) {
828 err = kvaser_usb_init_one(dev, i);
829 if (err) {
830 kvaser_usb_remove_interfaces(dev);
831 return err;
832 }
833 }
834
835 return 0;
836 }
837
kvaser_usb_disconnect(struct usb_interface * intf)838 static void kvaser_usb_disconnect(struct usb_interface *intf)
839 {
840 struct kvaser_usb *dev = usb_get_intfdata(intf);
841
842 usb_set_intfdata(intf, NULL);
843
844 if (!dev)
845 return;
846
847 kvaser_usb_remove_interfaces(dev);
848 }
849
850 static struct usb_driver kvaser_usb_driver = {
851 .name = "kvaser_usb",
852 .probe = kvaser_usb_probe,
853 .disconnect = kvaser_usb_disconnect,
854 .id_table = kvaser_usb_table,
855 };
856
857 module_usb_driver(kvaser_usb_driver);
858
859 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
860 MODULE_AUTHOR("Kvaser AB <support@kvaser.com>");
861 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
862 MODULE_LICENSE("GPL v2");
863