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4d8bc510 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0024d8ad BK |
2 | /* |
3 | * CAN driver for "8 devices" USB2CAN converter | |
4 | * | |
5 | * Copyright (C) 2012 Bernd Krumboeck (krumboeck@universalnet.at) | |
6 | * | |
0024d8ad BK |
7 | * This driver is inspired by the 3.2.0 version of drivers/net/can/usb/ems_usb.c |
8 | * and drivers/net/can/usb/esd_usb2.c | |
9 | * | |
10 | * Many thanks to Gerhard Bertelsmann (info@gerhard-bertelsmann.de) | |
11 | * for testing and fixing this driver. Also many thanks to "8 devices", | |
12 | * who were very cooperative and answered my questions. | |
13 | */ | |
14 | ||
409c188c | 15 | #include <linux/ethtool.h> |
0024d8ad BK |
16 | #include <linux/signal.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/usb.h> | |
21 | ||
22 | #include <linux/can.h> | |
23 | #include <linux/can/dev.h> | |
24 | #include <linux/can/error.h> | |
25 | ||
26 | /* driver constants */ | |
27 | #define MAX_RX_URBS 20 | |
28 | #define MAX_TX_URBS 20 | |
29 | #define RX_BUFFER_SIZE 64 | |
30 | ||
31 | /* vendor and product id */ | |
32 | #define USB_8DEV_VENDOR_ID 0x0483 | |
33 | #define USB_8DEV_PRODUCT_ID 0x1234 | |
34 | ||
35 | /* endpoints */ | |
36 | enum usb_8dev_endpoint { | |
37 | USB_8DEV_ENDP_DATA_RX = 1, | |
38 | USB_8DEV_ENDP_DATA_TX, | |
39 | USB_8DEV_ENDP_CMD_RX, | |
40 | USB_8DEV_ENDP_CMD_TX | |
41 | }; | |
42 | ||
43 | /* device CAN clock */ | |
44 | #define USB_8DEV_ABP_CLOCK 32000000 | |
45 | ||
46 | /* setup flags */ | |
47 | #define USB_8DEV_SILENT 0x01 | |
48 | #define USB_8DEV_LOOPBACK 0x02 | |
49 | #define USB_8DEV_DISABLE_AUTO_RESTRANS 0x04 | |
50 | #define USB_8DEV_STATUS_FRAME 0x08 | |
51 | ||
52 | /* commands */ | |
53 | enum usb_8dev_cmd { | |
54 | USB_8DEV_RESET = 1, | |
55 | USB_8DEV_OPEN, | |
56 | USB_8DEV_CLOSE, | |
57 | USB_8DEV_SET_SPEED, | |
58 | USB_8DEV_SET_MASK_FILTER, | |
59 | USB_8DEV_GET_STATUS, | |
60 | USB_8DEV_GET_STATISTICS, | |
61 | USB_8DEV_GET_SERIAL, | |
62 | USB_8DEV_GET_SOFTW_VER, | |
63 | USB_8DEV_GET_HARDW_VER, | |
64 | USB_8DEV_RESET_TIMESTAMP, | |
65 | USB_8DEV_GET_SOFTW_HARDW_VER | |
66 | }; | |
67 | ||
68 | /* command options */ | |
69 | #define USB_8DEV_BAUD_MANUAL 0x09 | |
70 | #define USB_8DEV_CMD_START 0x11 | |
71 | #define USB_8DEV_CMD_END 0x22 | |
72 | ||
73 | #define USB_8DEV_CMD_SUCCESS 0 | |
74 | #define USB_8DEV_CMD_ERROR 255 | |
75 | ||
76 | #define USB_8DEV_CMD_TIMEOUT 1000 | |
77 | ||
78 | /* frames */ | |
79 | #define USB_8DEV_DATA_START 0x55 | |
80 | #define USB_8DEV_DATA_END 0xAA | |
81 | ||
82 | #define USB_8DEV_TYPE_CAN_FRAME 0 | |
83 | #define USB_8DEV_TYPE_ERROR_FRAME 3 | |
84 | ||
85 | #define USB_8DEV_EXTID 0x01 | |
86 | #define USB_8DEV_RTR 0x02 | |
87 | #define USB_8DEV_ERR_FLAG 0x04 | |
88 | ||
89 | /* status */ | |
90 | #define USB_8DEV_STATUSMSG_OK 0x00 /* Normal condition. */ | |
88bfb9a7 | 91 | #define USB_8DEV_STATUSMSG_OVERRUN 0x01 /* Overrun occurred when sending */ |
0024d8ad BK |
92 | #define USB_8DEV_STATUSMSG_BUSLIGHT 0x02 /* Error counter has reached 96 */ |
93 | #define USB_8DEV_STATUSMSG_BUSHEAVY 0x03 /* Error count. has reached 128 */ | |
94 | #define USB_8DEV_STATUSMSG_BUSOFF 0x04 /* Device is in BUSOFF */ | |
95 | #define USB_8DEV_STATUSMSG_STUFF 0x20 /* Stuff Error */ | |
96 | #define USB_8DEV_STATUSMSG_FORM 0x21 /* Form Error */ | |
97 | #define USB_8DEV_STATUSMSG_ACK 0x23 /* Ack Error */ | |
98 | #define USB_8DEV_STATUSMSG_BIT0 0x24 /* Bit1 Error */ | |
99 | #define USB_8DEV_STATUSMSG_BIT1 0x25 /* Bit0 Error */ | |
100 | #define USB_8DEV_STATUSMSG_CRC 0x27 /* CRC Error */ | |
101 | ||
102 | #define USB_8DEV_RP_MASK 0x7F /* Mask for Receive Error Bit */ | |
103 | ||
104 | ||
105 | /* table of devices that work with this driver */ | |
106 | static const struct usb_device_id usb_8dev_table[] = { | |
107 | { USB_DEVICE(USB_8DEV_VENDOR_ID, USB_8DEV_PRODUCT_ID) }, | |
108 | { } /* Terminating entry */ | |
109 | }; | |
110 | ||
111 | MODULE_DEVICE_TABLE(usb, usb_8dev_table); | |
112 | ||
113 | struct usb_8dev_tx_urb_context { | |
114 | struct usb_8dev_priv *priv; | |
115 | ||
116 | u32 echo_index; | |
0024d8ad BK |
117 | }; |
118 | ||
119 | /* Structure to hold all of our device specific stuff */ | |
120 | struct usb_8dev_priv { | |
121 | struct can_priv can; /* must be the first member */ | |
122 | ||
0024d8ad BK |
123 | struct usb_device *udev; |
124 | struct net_device *netdev; | |
125 | ||
126 | atomic_t active_tx_urbs; | |
127 | struct usb_anchor tx_submitted; | |
128 | struct usb_8dev_tx_urb_context tx_contexts[MAX_TX_URBS]; | |
129 | ||
130 | struct usb_anchor rx_submitted; | |
131 | ||
132 | struct can_berr_counter bec; | |
133 | ||
134 | u8 *cmd_msg_buffer; | |
135 | ||
136 | struct mutex usb_8dev_cmd_lock; | |
0e865f0c PS |
137 | void *rxbuf[MAX_RX_URBS]; |
138 | dma_addr_t rxbuf_dma[MAX_RX_URBS]; | |
0024d8ad BK |
139 | }; |
140 | ||
141 | /* tx frame */ | |
142 | struct __packed usb_8dev_tx_msg { | |
143 | u8 begin; | |
144 | u8 flags; /* RTR and EXT_ID flag */ | |
145 | __be32 id; /* upper 3 bits not used */ | |
146 | u8 dlc; /* data length code 0-8 bytes */ | |
147 | u8 data[8]; /* 64-bit data */ | |
148 | u8 end; | |
149 | }; | |
150 | ||
151 | /* rx frame */ | |
152 | struct __packed usb_8dev_rx_msg { | |
153 | u8 begin; | |
154 | u8 type; /* frame type */ | |
155 | u8 flags; /* RTR and EXT_ID flag */ | |
156 | __be32 id; /* upper 3 bits not used */ | |
157 | u8 dlc; /* data length code 0-8 bytes */ | |
158 | u8 data[8]; /* 64-bit data */ | |
159 | __be32 timestamp; /* 32-bit timestamp */ | |
160 | u8 end; | |
161 | }; | |
162 | ||
163 | /* command frame */ | |
164 | struct __packed usb_8dev_cmd_msg { | |
165 | u8 begin; | |
88bfb9a7 | 166 | u8 channel; /* unknown - always 0 */ |
0024d8ad BK |
167 | u8 command; /* command to execute */ |
168 | u8 opt1; /* optional parameter / return value */ | |
169 | u8 opt2; /* optional parameter 2 */ | |
170 | u8 data[10]; /* optional parameter and data */ | |
171 | u8 end; | |
172 | }; | |
173 | ||
174 | static int usb_8dev_send_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size) | |
175 | { | |
176 | int actual_length; | |
177 | ||
178 | return usb_bulk_msg(priv->udev, | |
179 | usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_TX), | |
180 | msg, size, &actual_length, USB_8DEV_CMD_TIMEOUT); | |
181 | } | |
182 | ||
183 | static int usb_8dev_wait_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size, | |
184 | int *actual_length) | |
185 | { | |
186 | return usb_bulk_msg(priv->udev, | |
187 | usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_RX), | |
188 | msg, size, actual_length, USB_8DEV_CMD_TIMEOUT); | |
189 | } | |
190 | ||
191 | /* Send command to device and receive result. | |
192 | * Command was successful when opt1 = 0. | |
193 | */ | |
194 | static int usb_8dev_send_cmd(struct usb_8dev_priv *priv, | |
195 | struct usb_8dev_cmd_msg *out, | |
196 | struct usb_8dev_cmd_msg *in) | |
197 | { | |
198 | int err; | |
199 | int num_bytes_read; | |
200 | struct net_device *netdev; | |
201 | ||
202 | netdev = priv->netdev; | |
203 | ||
204 | out->begin = USB_8DEV_CMD_START; | |
205 | out->end = USB_8DEV_CMD_END; | |
206 | ||
207 | mutex_lock(&priv->usb_8dev_cmd_lock); | |
208 | ||
209 | memcpy(priv->cmd_msg_buffer, out, | |
210 | sizeof(struct usb_8dev_cmd_msg)); | |
211 | ||
212 | err = usb_8dev_send_cmd_msg(priv, priv->cmd_msg_buffer, | |
213 | sizeof(struct usb_8dev_cmd_msg)); | |
214 | if (err < 0) { | |
215 | netdev_err(netdev, "sending command message failed\n"); | |
216 | goto failed; | |
217 | } | |
218 | ||
219 | err = usb_8dev_wait_cmd_msg(priv, priv->cmd_msg_buffer, | |
220 | sizeof(struct usb_8dev_cmd_msg), | |
221 | &num_bytes_read); | |
222 | if (err < 0) { | |
223 | netdev_err(netdev, "no command message answer\n"); | |
224 | goto failed; | |
225 | } | |
226 | ||
227 | memcpy(in, priv->cmd_msg_buffer, sizeof(struct usb_8dev_cmd_msg)); | |
228 | ||
229 | if (in->begin != USB_8DEV_CMD_START || in->end != USB_8DEV_CMD_END || | |
230 | num_bytes_read != 16 || in->opt1 != 0) | |
231 | err = -EPROTO; | |
232 | ||
233 | failed: | |
234 | mutex_unlock(&priv->usb_8dev_cmd_lock); | |
235 | return err; | |
236 | } | |
237 | ||
238 | /* Send open command to device */ | |
239 | static int usb_8dev_cmd_open(struct usb_8dev_priv *priv) | |
240 | { | |
241 | struct can_bittiming *bt = &priv->can.bittiming; | |
242 | struct usb_8dev_cmd_msg outmsg; | |
243 | struct usb_8dev_cmd_msg inmsg; | |
244 | u32 ctrlmode = priv->can.ctrlmode; | |
245 | u32 flags = USB_8DEV_STATUS_FRAME; | |
246 | __be32 beflags; | |
247 | __be16 bebrp; | |
248 | ||
249 | memset(&outmsg, 0, sizeof(outmsg)); | |
250 | outmsg.command = USB_8DEV_OPEN; | |
251 | outmsg.opt1 = USB_8DEV_BAUD_MANUAL; | |
252 | outmsg.data[0] = bt->prop_seg + bt->phase_seg1; | |
253 | outmsg.data[1] = bt->phase_seg2; | |
254 | outmsg.data[2] = bt->sjw; | |
255 | ||
256 | /* BRP */ | |
257 | bebrp = cpu_to_be16((u16)bt->brp); | |
258 | memcpy(&outmsg.data[3], &bebrp, sizeof(bebrp)); | |
259 | ||
260 | /* flags */ | |
261 | if (ctrlmode & CAN_CTRLMODE_LOOPBACK) | |
262 | flags |= USB_8DEV_LOOPBACK; | |
263 | if (ctrlmode & CAN_CTRLMODE_LISTENONLY) | |
264 | flags |= USB_8DEV_SILENT; | |
265 | if (ctrlmode & CAN_CTRLMODE_ONE_SHOT) | |
266 | flags |= USB_8DEV_DISABLE_AUTO_RESTRANS; | |
267 | ||
268 | beflags = cpu_to_be32(flags); | |
269 | memcpy(&outmsg.data[5], &beflags, sizeof(beflags)); | |
270 | ||
271 | return usb_8dev_send_cmd(priv, &outmsg, &inmsg); | |
272 | } | |
273 | ||
274 | /* Send close command to device */ | |
275 | static int usb_8dev_cmd_close(struct usb_8dev_priv *priv) | |
276 | { | |
277 | struct usb_8dev_cmd_msg inmsg; | |
278 | struct usb_8dev_cmd_msg outmsg = { | |
279 | .channel = 0, | |
280 | .command = USB_8DEV_CLOSE, | |
281 | .opt1 = 0, | |
282 | .opt2 = 0 | |
283 | }; | |
284 | ||
285 | return usb_8dev_send_cmd(priv, &outmsg, &inmsg); | |
286 | } | |
287 | ||
288 | /* Get firmware and hardware version */ | |
289 | static int usb_8dev_cmd_version(struct usb_8dev_priv *priv, u32 *res) | |
290 | { | |
291 | struct usb_8dev_cmd_msg inmsg; | |
292 | struct usb_8dev_cmd_msg outmsg = { | |
293 | .channel = 0, | |
294 | .command = USB_8DEV_GET_SOFTW_HARDW_VER, | |
295 | .opt1 = 0, | |
296 | .opt2 = 0 | |
297 | }; | |
298 | ||
299 | int err = usb_8dev_send_cmd(priv, &outmsg, &inmsg); | |
300 | if (err) | |
301 | return err; | |
302 | ||
303 | *res = be32_to_cpup((__be32 *)inmsg.data); | |
304 | ||
305 | return err; | |
306 | } | |
307 | ||
308 | /* Set network device mode | |
309 | * | |
310 | * Maybe we should leave this function empty, because the device | |
311 | * set mode variable with open command. | |
312 | */ | |
313 | static int usb_8dev_set_mode(struct net_device *netdev, enum can_mode mode) | |
314 | { | |
315 | struct usb_8dev_priv *priv = netdev_priv(netdev); | |
316 | int err = 0; | |
317 | ||
318 | switch (mode) { | |
319 | case CAN_MODE_START: | |
320 | err = usb_8dev_cmd_open(priv); | |
321 | if (err) | |
322 | netdev_warn(netdev, "couldn't start device"); | |
323 | break; | |
324 | ||
325 | default: | |
326 | return -EOPNOTSUPP; | |
327 | } | |
328 | ||
329 | return err; | |
330 | } | |
331 | ||
332 | /* Read error/status frames */ | |
333 | static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv, | |
334 | struct usb_8dev_rx_msg *msg) | |
335 | { | |
336 | struct can_frame *cf; | |
337 | struct sk_buff *skb; | |
338 | struct net_device_stats *stats = &priv->netdev->stats; | |
339 | ||
340 | /* Error message: | |
341 | * byte 0: Status | |
342 | * byte 1: bit 7: Receive Passive | |
343 | * byte 1: bit 0-6: Receive Error Counter | |
344 | * byte 2: Transmit Error Counter | |
345 | * byte 3: Always 0 (maybe reserved for future use) | |
346 | */ | |
347 | ||
348 | u8 state = msg->data[0]; | |
349 | u8 rxerr = msg->data[1] & USB_8DEV_RP_MASK; | |
350 | u8 txerr = msg->data[2]; | |
351 | int rx_errors = 0; | |
352 | int tx_errors = 0; | |
353 | ||
354 | skb = alloc_can_err_skb(priv->netdev, &cf); | |
355 | if (!skb) | |
356 | return; | |
357 | ||
358 | switch (state) { | |
359 | case USB_8DEV_STATUSMSG_OK: | |
360 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
361 | cf->can_id |= CAN_ERR_PROT; | |
362 | cf->data[2] = CAN_ERR_PROT_ACTIVE; | |
363 | break; | |
364 | case USB_8DEV_STATUSMSG_BUSOFF: | |
365 | priv->can.state = CAN_STATE_BUS_OFF; | |
366 | cf->can_id |= CAN_ERR_BUSOFF; | |
be38a6f9 | 367 | priv->can.can_stats.bus_off++; |
0024d8ad BK |
368 | can_bus_off(priv->netdev); |
369 | break; | |
370 | case USB_8DEV_STATUSMSG_OVERRUN: | |
371 | case USB_8DEV_STATUSMSG_BUSLIGHT: | |
372 | case USB_8DEV_STATUSMSG_BUSHEAVY: | |
373 | cf->can_id |= CAN_ERR_CRTL; | |
374 | break; | |
375 | default: | |
376 | priv->can.state = CAN_STATE_ERROR_WARNING; | |
377 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; | |
378 | priv->can.can_stats.bus_error++; | |
379 | break; | |
380 | } | |
381 | ||
382 | switch (state) { | |
383 | case USB_8DEV_STATUSMSG_OK: | |
384 | case USB_8DEV_STATUSMSG_BUSOFF: | |
385 | break; | |
386 | case USB_8DEV_STATUSMSG_ACK: | |
387 | cf->can_id |= CAN_ERR_ACK; | |
388 | tx_errors = 1; | |
389 | break; | |
390 | case USB_8DEV_STATUSMSG_CRC: | |
ffd461f8 | 391 | cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; |
0024d8ad BK |
392 | rx_errors = 1; |
393 | break; | |
394 | case USB_8DEV_STATUSMSG_BIT0: | |
395 | cf->data[2] |= CAN_ERR_PROT_BIT0; | |
396 | tx_errors = 1; | |
397 | break; | |
398 | case USB_8DEV_STATUSMSG_BIT1: | |
399 | cf->data[2] |= CAN_ERR_PROT_BIT1; | |
400 | tx_errors = 1; | |
401 | break; | |
402 | case USB_8DEV_STATUSMSG_FORM: | |
403 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
404 | rx_errors = 1; | |
405 | break; | |
406 | case USB_8DEV_STATUSMSG_STUFF: | |
407 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
408 | rx_errors = 1; | |
409 | break; | |
410 | case USB_8DEV_STATUSMSG_OVERRUN: | |
411 | cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
412 | stats->rx_over_errors++; | |
413 | rx_errors = 1; | |
414 | break; | |
415 | case USB_8DEV_STATUSMSG_BUSLIGHT: | |
416 | priv->can.state = CAN_STATE_ERROR_WARNING; | |
417 | cf->data[1] = (txerr > rxerr) ? | |
418 | CAN_ERR_CRTL_TX_WARNING : | |
419 | CAN_ERR_CRTL_RX_WARNING; | |
420 | priv->can.can_stats.error_warning++; | |
421 | break; | |
422 | case USB_8DEV_STATUSMSG_BUSHEAVY: | |
423 | priv->can.state = CAN_STATE_ERROR_PASSIVE; | |
424 | cf->data[1] = (txerr > rxerr) ? | |
425 | CAN_ERR_CRTL_TX_PASSIVE : | |
426 | CAN_ERR_CRTL_RX_PASSIVE; | |
427 | priv->can.can_stats.error_passive++; | |
428 | break; | |
429 | default: | |
430 | netdev_warn(priv->netdev, | |
431 | "Unknown status/error message (%d)\n", state); | |
432 | break; | |
433 | } | |
434 | ||
435 | if (tx_errors) { | |
436 | cf->data[2] |= CAN_ERR_PROT_TX; | |
437 | stats->tx_errors++; | |
438 | } | |
439 | ||
440 | if (rx_errors) | |
441 | stats->rx_errors++; | |
aebe8a24 | 442 | if (priv->can.state != CAN_STATE_BUS_OFF) { |
3e5c291c | 443 | cf->can_id |= CAN_ERR_CNT; |
aebe8a24 VM |
444 | cf->data[6] = txerr; |
445 | cf->data[7] = rxerr; | |
446 | } | |
0024d8ad BK |
447 | |
448 | priv->bec.txerr = txerr; | |
449 | priv->bec.rxerr = rxerr; | |
450 | ||
9b721a4c | 451 | netif_rx(skb); |
0024d8ad BK |
452 | } |
453 | ||
454 | /* Read data and status frames */ | |
455 | static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv, | |
456 | struct usb_8dev_rx_msg *msg) | |
457 | { | |
458 | struct can_frame *cf; | |
459 | struct sk_buff *skb; | |
460 | struct net_device_stats *stats = &priv->netdev->stats; | |
461 | ||
462 | if (msg->type == USB_8DEV_TYPE_ERROR_FRAME && | |
463 | msg->flags == USB_8DEV_ERR_FLAG) { | |
464 | usb_8dev_rx_err_msg(priv, msg); | |
465 | } else if (msg->type == USB_8DEV_TYPE_CAN_FRAME) { | |
466 | skb = alloc_can_skb(priv->netdev, &cf); | |
467 | if (!skb) | |
468 | return; | |
469 | ||
470 | cf->can_id = be32_to_cpu(msg->id); | |
4c01fc87 | 471 | can_frame_set_cc_len(cf, msg->dlc & 0xF, priv->can.ctrlmode); |
0024d8ad BK |
472 | |
473 | if (msg->flags & USB_8DEV_EXTID) | |
474 | cf->can_id |= CAN_EFF_FLAG; | |
475 | ||
8e674ca7 | 476 | if (msg->flags & USB_8DEV_RTR) { |
0024d8ad | 477 | cf->can_id |= CAN_RTR_FLAG; |
8e674ca7 | 478 | } else { |
c7b74967 | 479 | memcpy(cf->data, msg->data, cf->len); |
8e674ca7 VM |
480 | stats->rx_bytes += cf->len; |
481 | } | |
0024d8ad | 482 | stats->rx_packets++; |
8e674ca7 | 483 | |
9b721a4c | 484 | netif_rx(skb); |
0024d8ad BK |
485 | } else { |
486 | netdev_warn(priv->netdev, "frame type %d unknown", | |
487 | msg->type); | |
488 | } | |
489 | ||
490 | } | |
491 | ||
492 | /* Callback for reading data from device | |
493 | * | |
494 | * Check urb status, call read function and resubmit urb read operation. | |
495 | */ | |
496 | static void usb_8dev_read_bulk_callback(struct urb *urb) | |
497 | { | |
498 | struct usb_8dev_priv *priv = urb->context; | |
499 | struct net_device *netdev; | |
500 | int retval; | |
501 | int pos = 0; | |
502 | ||
503 | netdev = priv->netdev; | |
504 | ||
505 | if (!netif_device_present(netdev)) | |
506 | return; | |
507 | ||
508 | switch (urb->status) { | |
509 | case 0: /* success */ | |
510 | break; | |
511 | ||
512 | case -ENOENT: | |
12147edc MK |
513 | case -EPIPE: |
514 | case -EPROTO: | |
0024d8ad BK |
515 | case -ESHUTDOWN: |
516 | return; | |
517 | ||
518 | default: | |
519 | netdev_info(netdev, "Rx URB aborted (%d)\n", | |
520 | urb->status); | |
521 | goto resubmit_urb; | |
522 | } | |
523 | ||
524 | while (pos < urb->actual_length) { | |
525 | struct usb_8dev_rx_msg *msg; | |
526 | ||
527 | if (pos + sizeof(struct usb_8dev_rx_msg) > urb->actual_length) { | |
528 | netdev_err(priv->netdev, "format error\n"); | |
529 | break; | |
530 | } | |
531 | ||
532 | msg = (struct usb_8dev_rx_msg *)(urb->transfer_buffer + pos); | |
533 | usb_8dev_rx_can_msg(priv, msg); | |
534 | ||
535 | pos += sizeof(struct usb_8dev_rx_msg); | |
536 | } | |
537 | ||
538 | resubmit_urb: | |
539 | usb_fill_bulk_urb(urb, priv->udev, | |
540 | usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_RX), | |
541 | urb->transfer_buffer, RX_BUFFER_SIZE, | |
542 | usb_8dev_read_bulk_callback, priv); | |
543 | ||
544 | retval = usb_submit_urb(urb, GFP_ATOMIC); | |
545 | ||
546 | if (retval == -ENODEV) | |
547 | netif_device_detach(netdev); | |
548 | else if (retval) | |
549 | netdev_err(netdev, | |
550 | "failed resubmitting read bulk urb: %d\n", retval); | |
551 | } | |
552 | ||
553 | /* Callback handler for write operations | |
554 | * | |
555 | * Free allocated buffers, check transmit status and | |
556 | * calculate statistic. | |
557 | */ | |
558 | static void usb_8dev_write_bulk_callback(struct urb *urb) | |
559 | { | |
560 | struct usb_8dev_tx_urb_context *context = urb->context; | |
561 | struct usb_8dev_priv *priv; | |
562 | struct net_device *netdev; | |
563 | ||
564 | BUG_ON(!context); | |
565 | ||
566 | priv = context->priv; | |
567 | netdev = priv->netdev; | |
568 | ||
569 | /* free up our allocated buffer */ | |
570 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, | |
571 | urb->transfer_buffer, urb->transfer_dma); | |
572 | ||
573 | atomic_dec(&priv->active_tx_urbs); | |
574 | ||
575 | if (!netif_device_present(netdev)) | |
576 | return; | |
577 | ||
578 | if (urb->status) | |
579 | netdev_info(netdev, "Tx URB aborted (%d)\n", | |
580 | urb->status); | |
581 | ||
582 | netdev->stats.tx_packets++; | |
cc4b08c3 | 583 | netdev->stats.tx_bytes += can_get_echo_skb(netdev, context->echo_index, NULL); |
0024d8ad BK |
584 | |
585 | /* Release context */ | |
586 | context->echo_index = MAX_TX_URBS; | |
587 | ||
588 | netif_wake_queue(netdev); | |
589 | } | |
590 | ||
591 | /* Send data to device */ | |
592 | static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb, | |
593 | struct net_device *netdev) | |
594 | { | |
595 | struct usb_8dev_priv *priv = netdev_priv(netdev); | |
596 | struct net_device_stats *stats = &netdev->stats; | |
597 | struct can_frame *cf = (struct can_frame *) skb->data; | |
598 | struct usb_8dev_tx_msg *msg; | |
599 | struct urb *urb; | |
600 | struct usb_8dev_tx_urb_context *context = NULL; | |
601 | u8 *buf; | |
602 | int i, err; | |
603 | size_t size = sizeof(struct usb_8dev_tx_msg); | |
604 | ||
ae64438b | 605 | if (can_dev_dropped_skb(netdev, skb)) |
0024d8ad BK |
606 | return NETDEV_TX_OK; |
607 | ||
608 | /* create a URB, and a buffer for it, and copy the data to the URB */ | |
609 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
7fe7cfa4 | 610 | if (!urb) |
0024d8ad | 611 | goto nomem; |
0024d8ad BK |
612 | |
613 | buf = usb_alloc_coherent(priv->udev, size, GFP_ATOMIC, | |
614 | &urb->transfer_dma); | |
615 | if (!buf) { | |
616 | netdev_err(netdev, "No memory left for USB buffer\n"); | |
617 | goto nomembuf; | |
618 | } | |
619 | ||
620 | memset(buf, 0, size); | |
621 | ||
622 | msg = (struct usb_8dev_tx_msg *)buf; | |
623 | msg->begin = USB_8DEV_DATA_START; | |
624 | msg->flags = 0x00; | |
625 | ||
626 | if (cf->can_id & CAN_RTR_FLAG) | |
627 | msg->flags |= USB_8DEV_RTR; | |
628 | ||
629 | if (cf->can_id & CAN_EFF_FLAG) | |
630 | msg->flags |= USB_8DEV_EXTID; | |
631 | ||
632 | msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK); | |
4c01fc87 | 633 | msg->dlc = can_get_cc_dlc(cf, priv->can.ctrlmode); |
c7b74967 | 634 | memcpy(msg->data, cf->data, cf->len); |
0024d8ad BK |
635 | msg->end = USB_8DEV_DATA_END; |
636 | ||
637 | for (i = 0; i < MAX_TX_URBS; i++) { | |
638 | if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { | |
639 | context = &priv->tx_contexts[i]; | |
640 | break; | |
641 | } | |
642 | } | |
643 | ||
644 | /* May never happen! When this happens we'd more URBs in flight as | |
645 | * allowed (MAX_TX_URBS). | |
646 | */ | |
647 | if (!context) | |
648 | goto nofreecontext; | |
649 | ||
650 | context->priv = priv; | |
651 | context->echo_index = i; | |
0024d8ad BK |
652 | |
653 | usb_fill_bulk_urb(urb, priv->udev, | |
654 | usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_TX), | |
655 | buf, size, usb_8dev_write_bulk_callback, context); | |
656 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
657 | usb_anchor_urb(urb, &priv->tx_submitted); | |
658 | ||
1dcb6e57 | 659 | can_put_echo_skb(skb, netdev, context->echo_index, 0); |
0024d8ad BK |
660 | |
661 | atomic_inc(&priv->active_tx_urbs); | |
662 | ||
663 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
3d3925ff HH |
664 | if (unlikely(err)) { |
665 | can_free_echo_skb(netdev, context->echo_index, NULL); | |
666 | ||
667 | usb_unanchor_urb(urb); | |
668 | usb_free_coherent(priv->udev, size, buf, urb->transfer_dma); | |
669 | ||
670 | atomic_dec(&priv->active_tx_urbs); | |
671 | ||
672 | if (err == -ENODEV) | |
673 | netif_device_detach(netdev); | |
674 | else | |
675 | netdev_warn(netdev, "failed tx_urb %d\n", err); | |
676 | stats->tx_dropped++; | |
677 | } else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS) | |
0024d8ad BK |
678 | /* Slow down tx path */ |
679 | netif_stop_queue(netdev); | |
680 | ||
681 | /* Release our reference to this URB, the USB core will eventually free | |
682 | * it entirely. | |
683 | */ | |
684 | usb_free_urb(urb); | |
685 | ||
686 | return NETDEV_TX_OK; | |
687 | ||
688 | nofreecontext: | |
0024d8ad | 689 | usb_free_coherent(priv->udev, size, buf, urb->transfer_dma); |
636d0375 | 690 | usb_free_urb(urb); |
0024d8ad BK |
691 | |
692 | netdev_warn(netdev, "couldn't find free context"); | |
693 | ||
694 | return NETDEV_TX_BUSY; | |
695 | ||
0024d8ad BK |
696 | nomembuf: |
697 | usb_free_urb(urb); | |
698 | ||
699 | nomem: | |
700 | dev_kfree_skb(skb); | |
701 | stats->tx_dropped++; | |
702 | ||
703 | return NETDEV_TX_OK; | |
704 | } | |
705 | ||
706 | static int usb_8dev_get_berr_counter(const struct net_device *netdev, | |
707 | struct can_berr_counter *bec) | |
708 | { | |
709 | struct usb_8dev_priv *priv = netdev_priv(netdev); | |
710 | ||
711 | bec->txerr = priv->bec.txerr; | |
712 | bec->rxerr = priv->bec.rxerr; | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
717 | /* Start USB device */ | |
718 | static int usb_8dev_start(struct usb_8dev_priv *priv) | |
719 | { | |
720 | struct net_device *netdev = priv->netdev; | |
721 | int err, i; | |
722 | ||
723 | for (i = 0; i < MAX_RX_URBS; i++) { | |
724 | struct urb *urb = NULL; | |
725 | u8 *buf; | |
0e865f0c | 726 | dma_addr_t buf_dma; |
0024d8ad BK |
727 | |
728 | /* create a URB, and a buffer for it */ | |
729 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
730 | if (!urb) { | |
0024d8ad BK |
731 | err = -ENOMEM; |
732 | break; | |
733 | } | |
734 | ||
735 | buf = usb_alloc_coherent(priv->udev, RX_BUFFER_SIZE, GFP_KERNEL, | |
0e865f0c | 736 | &buf_dma); |
0024d8ad BK |
737 | if (!buf) { |
738 | netdev_err(netdev, "No memory left for USB buffer\n"); | |
739 | usb_free_urb(urb); | |
740 | err = -ENOMEM; | |
741 | break; | |
742 | } | |
743 | ||
0e865f0c PS |
744 | urb->transfer_dma = buf_dma; |
745 | ||
0024d8ad BK |
746 | usb_fill_bulk_urb(urb, priv->udev, |
747 | usb_rcvbulkpipe(priv->udev, | |
748 | USB_8DEV_ENDP_DATA_RX), | |
749 | buf, RX_BUFFER_SIZE, | |
750 | usb_8dev_read_bulk_callback, priv); | |
751 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
752 | usb_anchor_urb(urb, &priv->rx_submitted); | |
753 | ||
754 | err = usb_submit_urb(urb, GFP_KERNEL); | |
755 | if (err) { | |
756 | usb_unanchor_urb(urb); | |
757 | usb_free_coherent(priv->udev, RX_BUFFER_SIZE, buf, | |
758 | urb->transfer_dma); | |
76719868 | 759 | usb_free_urb(urb); |
0024d8ad BK |
760 | break; |
761 | } | |
762 | ||
0e865f0c PS |
763 | priv->rxbuf[i] = buf; |
764 | priv->rxbuf_dma[i] = buf_dma; | |
765 | ||
0024d8ad BK |
766 | /* Drop reference, USB core will take care of freeing it */ |
767 | usb_free_urb(urb); | |
768 | } | |
769 | ||
770 | /* Did we submit any URBs */ | |
771 | if (i == 0) { | |
772 | netdev_warn(netdev, "couldn't setup read URBs\n"); | |
773 | return err; | |
774 | } | |
775 | ||
776 | /* Warn if we've couldn't transmit all the URBs */ | |
777 | if (i < MAX_RX_URBS) | |
778 | netdev_warn(netdev, "rx performance may be slow\n"); | |
779 | ||
780 | err = usb_8dev_cmd_open(priv); | |
781 | if (err) | |
782 | goto failed; | |
783 | ||
784 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
785 | ||
786 | return 0; | |
787 | ||
788 | failed: | |
789 | if (err == -ENODEV) | |
790 | netif_device_detach(priv->netdev); | |
791 | ||
792 | netdev_warn(netdev, "couldn't submit control: %d\n", err); | |
793 | ||
794 | return err; | |
795 | } | |
796 | ||
797 | /* Open USB device */ | |
798 | static int usb_8dev_open(struct net_device *netdev) | |
799 | { | |
800 | struct usb_8dev_priv *priv = netdev_priv(netdev); | |
801 | int err; | |
802 | ||
803 | /* common open */ | |
804 | err = open_candev(netdev); | |
805 | if (err) | |
806 | return err; | |
807 | ||
808 | /* finally start device */ | |
809 | err = usb_8dev_start(priv); | |
810 | if (err) { | |
811 | if (err == -ENODEV) | |
812 | netif_device_detach(priv->netdev); | |
813 | ||
814 | netdev_warn(netdev, "couldn't start device: %d\n", | |
815 | err); | |
816 | ||
817 | close_candev(netdev); | |
818 | ||
819 | return err; | |
820 | } | |
821 | ||
822 | netif_start_queue(netdev); | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | static void unlink_all_urbs(struct usb_8dev_priv *priv) | |
828 | { | |
829 | int i; | |
830 | ||
831 | usb_kill_anchored_urbs(&priv->rx_submitted); | |
832 | ||
0e865f0c PS |
833 | for (i = 0; i < MAX_RX_URBS; ++i) |
834 | usb_free_coherent(priv->udev, RX_BUFFER_SIZE, | |
835 | priv->rxbuf[i], priv->rxbuf_dma[i]); | |
836 | ||
0024d8ad BK |
837 | usb_kill_anchored_urbs(&priv->tx_submitted); |
838 | atomic_set(&priv->active_tx_urbs, 0); | |
839 | ||
840 | for (i = 0; i < MAX_TX_URBS; i++) | |
841 | priv->tx_contexts[i].echo_index = MAX_TX_URBS; | |
842 | } | |
843 | ||
844 | /* Close USB device */ | |
845 | static int usb_8dev_close(struct net_device *netdev) | |
846 | { | |
847 | struct usb_8dev_priv *priv = netdev_priv(netdev); | |
848 | int err = 0; | |
849 | ||
850 | /* Send CLOSE command to CAN controller */ | |
851 | err = usb_8dev_cmd_close(priv); | |
852 | if (err) | |
853 | netdev_warn(netdev, "couldn't stop device"); | |
854 | ||
855 | priv->can.state = CAN_STATE_STOPPED; | |
856 | ||
857 | netif_stop_queue(netdev); | |
858 | ||
859 | /* Stop polling */ | |
860 | unlink_all_urbs(priv); | |
861 | ||
862 | close_candev(netdev); | |
863 | ||
864 | return err; | |
865 | } | |
866 | ||
867 | static const struct net_device_ops usb_8dev_netdev_ops = { | |
868 | .ndo_open = usb_8dev_open, | |
869 | .ndo_stop = usb_8dev_close, | |
870 | .ndo_start_xmit = usb_8dev_start_xmit, | |
c971fa2a | 871 | .ndo_change_mtu = can_change_mtu, |
0024d8ad BK |
872 | }; |
873 | ||
409c188c VM |
874 | static const struct ethtool_ops usb_8dev_ethtool_ops = { |
875 | .get_ts_info = ethtool_op_get_ts_info, | |
876 | }; | |
877 | ||
0024d8ad | 878 | static const struct can_bittiming_const usb_8dev_bittiming_const = { |
6f266060 | 879 | .name = KBUILD_MODNAME, |
0024d8ad BK |
880 | .tseg1_min = 1, |
881 | .tseg1_max = 16, | |
882 | .tseg2_min = 1, | |
883 | .tseg2_max = 8, | |
884 | .sjw_max = 4, | |
885 | .brp_min = 1, | |
886 | .brp_max = 1024, | |
887 | .brp_inc = 1, | |
888 | }; | |
889 | ||
890 | /* Probe USB device | |
891 | * | |
892 | * Check device and firmware. | |
893 | * Set supported modes and bittiming constants. | |
894 | * Allocate some memory. | |
895 | */ | |
896 | static int usb_8dev_probe(struct usb_interface *intf, | |
897 | const struct usb_device_id *id) | |
898 | { | |
899 | struct net_device *netdev; | |
900 | struct usb_8dev_priv *priv; | |
901 | int i, err = -ENOMEM; | |
902 | u32 version; | |
903 | char buf[18]; | |
904 | struct usb_device *usbdev = interface_to_usbdev(intf); | |
905 | ||
906 | /* product id looks strange, better we also check iProduct string */ | |
907 | if (usb_string(usbdev, usbdev->descriptor.iProduct, buf, | |
908 | sizeof(buf)) > 0 && strcmp(buf, "USB2CAN converter")) { | |
909 | dev_info(&usbdev->dev, "ignoring: not an USB2CAN converter\n"); | |
910 | return -ENODEV; | |
911 | } | |
912 | ||
913 | netdev = alloc_candev(sizeof(struct usb_8dev_priv), MAX_TX_URBS); | |
914 | if (!netdev) { | |
915 | dev_err(&intf->dev, "Couldn't alloc candev\n"); | |
916 | return -ENOMEM; | |
917 | } | |
918 | ||
919 | priv = netdev_priv(netdev); | |
920 | ||
921 | priv->udev = usbdev; | |
922 | priv->netdev = netdev; | |
923 | ||
924 | priv->can.state = CAN_STATE_STOPPED; | |
925 | priv->can.clock.freq = USB_8DEV_ABP_CLOCK; | |
926 | priv->can.bittiming_const = &usb_8dev_bittiming_const; | |
927 | priv->can.do_set_mode = usb_8dev_set_mode; | |
928 | priv->can.do_get_berr_counter = usb_8dev_get_berr_counter; | |
929 | priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | | |
930 | CAN_CTRLMODE_LISTENONLY | | |
4c01fc87 OH |
931 | CAN_CTRLMODE_ONE_SHOT | |
932 | CAN_CTRLMODE_CC_LEN8_DLC; | |
0024d8ad BK |
933 | |
934 | netdev->netdev_ops = &usb_8dev_netdev_ops; | |
409c188c | 935 | netdev->ethtool_ops = &usb_8dev_ethtool_ops; |
0024d8ad BK |
936 | |
937 | netdev->flags |= IFF_ECHO; /* we support local echo */ | |
938 | ||
939 | init_usb_anchor(&priv->rx_submitted); | |
940 | ||
941 | init_usb_anchor(&priv->tx_submitted); | |
942 | atomic_set(&priv->active_tx_urbs, 0); | |
943 | ||
944 | for (i = 0; i < MAX_TX_URBS; i++) | |
945 | priv->tx_contexts[i].echo_index = MAX_TX_URBS; | |
946 | ||
7c426313 MKB |
947 | priv->cmd_msg_buffer = devm_kzalloc(&intf->dev, sizeof(struct usb_8dev_cmd_msg), |
948 | GFP_KERNEL); | |
09da6c5f | 949 | if (!priv->cmd_msg_buffer) |
0024d8ad | 950 | goto cleanup_candev; |
0024d8ad BK |
951 | |
952 | usb_set_intfdata(intf, priv); | |
953 | ||
954 | SET_NETDEV_DEV(netdev, &intf->dev); | |
955 | ||
956 | mutex_init(&priv->usb_8dev_cmd_lock); | |
957 | ||
958 | err = register_candev(netdev); | |
959 | if (err) { | |
960 | netdev_err(netdev, | |
961 | "couldn't register CAN device: %d\n", err); | |
7c426313 | 962 | goto cleanup_candev; |
0024d8ad BK |
963 | } |
964 | ||
965 | err = usb_8dev_cmd_version(priv, &version); | |
966 | if (err) { | |
967 | netdev_err(netdev, "can't get firmware version\n"); | |
4afe2156 | 968 | goto cleanup_unregister_candev; |
0024d8ad BK |
969 | } else { |
970 | netdev_info(netdev, | |
971 | "firmware: %d.%d, hardware: %d.%d\n", | |
972 | (version>>24) & 0xff, (version>>16) & 0xff, | |
973 | (version>>8) & 0xff, version & 0xff); | |
974 | } | |
975 | ||
976 | return 0; | |
977 | ||
4afe2156 MKB |
978 | cleanup_unregister_candev: |
979 | unregister_netdev(priv->netdev); | |
980 | ||
0024d8ad BK |
981 | cleanup_candev: |
982 | free_candev(netdev); | |
983 | ||
984 | return err; | |
985 | ||
986 | } | |
987 | ||
988 | /* Called by the usb core when driver is unloaded or device is removed */ | |
989 | static void usb_8dev_disconnect(struct usb_interface *intf) | |
990 | { | |
991 | struct usb_8dev_priv *priv = usb_get_intfdata(intf); | |
992 | ||
993 | usb_set_intfdata(intf, NULL); | |
994 | ||
995 | if (priv) { | |
996 | netdev_info(priv->netdev, "device disconnected\n"); | |
997 | ||
998 | unregister_netdev(priv->netdev); | |
0024d8ad | 999 | unlink_all_urbs(priv); |
37597394 | 1000 | free_candev(priv->netdev); |
0024d8ad BK |
1001 | } |
1002 | ||
1003 | } | |
1004 | ||
1005 | static struct usb_driver usb_8dev_driver = { | |
6f266060 | 1006 | .name = KBUILD_MODNAME, |
0024d8ad BK |
1007 | .probe = usb_8dev_probe, |
1008 | .disconnect = usb_8dev_disconnect, | |
1009 | .id_table = usb_8dev_table, | |
1010 | }; | |
1011 | ||
1012 | module_usb_driver(usb_8dev_driver); | |
1013 | ||
1014 | MODULE_AUTHOR("Bernd Krumboeck <krumboeck@universalnet.at>"); | |
1015 | MODULE_DESCRIPTION("CAN driver for 8 devices USB2CAN interfaces"); | |
1016 | MODULE_LICENSE("GPL v2"); |