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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 | ||
0024d8ad BK |
15 | #include <linux/signal.h> |
16 | #include <linux/slab.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/usb.h> | |
20 | ||
21 | #include <linux/can.h> | |
22 | #include <linux/can/dev.h> | |
23 | #include <linux/can/error.h> | |
e2d5f2c7 | 24 | #include <linux/can/led.h> |
0024d8ad BK |
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; | |
117 | u8 dlc; | |
118 | }; | |
119 | ||
120 | /* Structure to hold all of our device specific stuff */ | |
121 | struct usb_8dev_priv { | |
122 | struct can_priv can; /* must be the first member */ | |
123 | ||
124 | struct sk_buff *echo_skb[MAX_TX_URBS]; | |
125 | ||
126 | struct usb_device *udev; | |
127 | struct net_device *netdev; | |
128 | ||
129 | atomic_t active_tx_urbs; | |
130 | struct usb_anchor tx_submitted; | |
131 | struct usb_8dev_tx_urb_context tx_contexts[MAX_TX_URBS]; | |
132 | ||
133 | struct usb_anchor rx_submitted; | |
134 | ||
135 | struct can_berr_counter bec; | |
136 | ||
137 | u8 *cmd_msg_buffer; | |
138 | ||
139 | struct mutex usb_8dev_cmd_lock; | |
140 | ||
141 | }; | |
142 | ||
143 | /* tx frame */ | |
144 | struct __packed usb_8dev_tx_msg { | |
145 | u8 begin; | |
146 | u8 flags; /* RTR and EXT_ID flag */ | |
147 | __be32 id; /* upper 3 bits not used */ | |
148 | u8 dlc; /* data length code 0-8 bytes */ | |
149 | u8 data[8]; /* 64-bit data */ | |
150 | u8 end; | |
151 | }; | |
152 | ||
153 | /* rx frame */ | |
154 | struct __packed usb_8dev_rx_msg { | |
155 | u8 begin; | |
156 | u8 type; /* frame type */ | |
157 | u8 flags; /* RTR and EXT_ID flag */ | |
158 | __be32 id; /* upper 3 bits not used */ | |
159 | u8 dlc; /* data length code 0-8 bytes */ | |
160 | u8 data[8]; /* 64-bit data */ | |
161 | __be32 timestamp; /* 32-bit timestamp */ | |
162 | u8 end; | |
163 | }; | |
164 | ||
165 | /* command frame */ | |
166 | struct __packed usb_8dev_cmd_msg { | |
167 | u8 begin; | |
88bfb9a7 | 168 | u8 channel; /* unknown - always 0 */ |
0024d8ad BK |
169 | u8 command; /* command to execute */ |
170 | u8 opt1; /* optional parameter / return value */ | |
171 | u8 opt2; /* optional parameter 2 */ | |
172 | u8 data[10]; /* optional parameter and data */ | |
173 | u8 end; | |
174 | }; | |
175 | ||
176 | static int usb_8dev_send_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size) | |
177 | { | |
178 | int actual_length; | |
179 | ||
180 | return usb_bulk_msg(priv->udev, | |
181 | usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_TX), | |
182 | msg, size, &actual_length, USB_8DEV_CMD_TIMEOUT); | |
183 | } | |
184 | ||
185 | static int usb_8dev_wait_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size, | |
186 | int *actual_length) | |
187 | { | |
188 | return usb_bulk_msg(priv->udev, | |
189 | usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_RX), | |
190 | msg, size, actual_length, USB_8DEV_CMD_TIMEOUT); | |
191 | } | |
192 | ||
193 | /* Send command to device and receive result. | |
194 | * Command was successful when opt1 = 0. | |
195 | */ | |
196 | static int usb_8dev_send_cmd(struct usb_8dev_priv *priv, | |
197 | struct usb_8dev_cmd_msg *out, | |
198 | struct usb_8dev_cmd_msg *in) | |
199 | { | |
200 | int err; | |
201 | int num_bytes_read; | |
202 | struct net_device *netdev; | |
203 | ||
204 | netdev = priv->netdev; | |
205 | ||
206 | out->begin = USB_8DEV_CMD_START; | |
207 | out->end = USB_8DEV_CMD_END; | |
208 | ||
209 | mutex_lock(&priv->usb_8dev_cmd_lock); | |
210 | ||
211 | memcpy(priv->cmd_msg_buffer, out, | |
212 | sizeof(struct usb_8dev_cmd_msg)); | |
213 | ||
214 | err = usb_8dev_send_cmd_msg(priv, priv->cmd_msg_buffer, | |
215 | sizeof(struct usb_8dev_cmd_msg)); | |
216 | if (err < 0) { | |
217 | netdev_err(netdev, "sending command message failed\n"); | |
218 | goto failed; | |
219 | } | |
220 | ||
221 | err = usb_8dev_wait_cmd_msg(priv, priv->cmd_msg_buffer, | |
222 | sizeof(struct usb_8dev_cmd_msg), | |
223 | &num_bytes_read); | |
224 | if (err < 0) { | |
225 | netdev_err(netdev, "no command message answer\n"); | |
226 | goto failed; | |
227 | } | |
228 | ||
229 | memcpy(in, priv->cmd_msg_buffer, sizeof(struct usb_8dev_cmd_msg)); | |
230 | ||
231 | if (in->begin != USB_8DEV_CMD_START || in->end != USB_8DEV_CMD_END || | |
232 | num_bytes_read != 16 || in->opt1 != 0) | |
233 | err = -EPROTO; | |
234 | ||
235 | failed: | |
236 | mutex_unlock(&priv->usb_8dev_cmd_lock); | |
237 | return err; | |
238 | } | |
239 | ||
240 | /* Send open command to device */ | |
241 | static int usb_8dev_cmd_open(struct usb_8dev_priv *priv) | |
242 | { | |
243 | struct can_bittiming *bt = &priv->can.bittiming; | |
244 | struct usb_8dev_cmd_msg outmsg; | |
245 | struct usb_8dev_cmd_msg inmsg; | |
246 | u32 ctrlmode = priv->can.ctrlmode; | |
247 | u32 flags = USB_8DEV_STATUS_FRAME; | |
248 | __be32 beflags; | |
249 | __be16 bebrp; | |
250 | ||
251 | memset(&outmsg, 0, sizeof(outmsg)); | |
252 | outmsg.command = USB_8DEV_OPEN; | |
253 | outmsg.opt1 = USB_8DEV_BAUD_MANUAL; | |
254 | outmsg.data[0] = bt->prop_seg + bt->phase_seg1; | |
255 | outmsg.data[1] = bt->phase_seg2; | |
256 | outmsg.data[2] = bt->sjw; | |
257 | ||
258 | /* BRP */ | |
259 | bebrp = cpu_to_be16((u16)bt->brp); | |
260 | memcpy(&outmsg.data[3], &bebrp, sizeof(bebrp)); | |
261 | ||
262 | /* flags */ | |
263 | if (ctrlmode & CAN_CTRLMODE_LOOPBACK) | |
264 | flags |= USB_8DEV_LOOPBACK; | |
265 | if (ctrlmode & CAN_CTRLMODE_LISTENONLY) | |
266 | flags |= USB_8DEV_SILENT; | |
267 | if (ctrlmode & CAN_CTRLMODE_ONE_SHOT) | |
268 | flags |= USB_8DEV_DISABLE_AUTO_RESTRANS; | |
269 | ||
270 | beflags = cpu_to_be32(flags); | |
271 | memcpy(&outmsg.data[5], &beflags, sizeof(beflags)); | |
272 | ||
273 | return usb_8dev_send_cmd(priv, &outmsg, &inmsg); | |
274 | } | |
275 | ||
276 | /* Send close command to device */ | |
277 | static int usb_8dev_cmd_close(struct usb_8dev_priv *priv) | |
278 | { | |
279 | struct usb_8dev_cmd_msg inmsg; | |
280 | struct usb_8dev_cmd_msg outmsg = { | |
281 | .channel = 0, | |
282 | .command = USB_8DEV_CLOSE, | |
283 | .opt1 = 0, | |
284 | .opt2 = 0 | |
285 | }; | |
286 | ||
287 | return usb_8dev_send_cmd(priv, &outmsg, &inmsg); | |
288 | } | |
289 | ||
290 | /* Get firmware and hardware version */ | |
291 | static int usb_8dev_cmd_version(struct usb_8dev_priv *priv, u32 *res) | |
292 | { | |
293 | struct usb_8dev_cmd_msg inmsg; | |
294 | struct usb_8dev_cmd_msg outmsg = { | |
295 | .channel = 0, | |
296 | .command = USB_8DEV_GET_SOFTW_HARDW_VER, | |
297 | .opt1 = 0, | |
298 | .opt2 = 0 | |
299 | }; | |
300 | ||
301 | int err = usb_8dev_send_cmd(priv, &outmsg, &inmsg); | |
302 | if (err) | |
303 | return err; | |
304 | ||
305 | *res = be32_to_cpup((__be32 *)inmsg.data); | |
306 | ||
307 | return err; | |
308 | } | |
309 | ||
310 | /* Set network device mode | |
311 | * | |
312 | * Maybe we should leave this function empty, because the device | |
313 | * set mode variable with open command. | |
314 | */ | |
315 | static int usb_8dev_set_mode(struct net_device *netdev, enum can_mode mode) | |
316 | { | |
317 | struct usb_8dev_priv *priv = netdev_priv(netdev); | |
318 | int err = 0; | |
319 | ||
320 | switch (mode) { | |
321 | case CAN_MODE_START: | |
322 | err = usb_8dev_cmd_open(priv); | |
323 | if (err) | |
324 | netdev_warn(netdev, "couldn't start device"); | |
325 | break; | |
326 | ||
327 | default: | |
328 | return -EOPNOTSUPP; | |
329 | } | |
330 | ||
331 | return err; | |
332 | } | |
333 | ||
334 | /* Read error/status frames */ | |
335 | static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv, | |
336 | struct usb_8dev_rx_msg *msg) | |
337 | { | |
338 | struct can_frame *cf; | |
339 | struct sk_buff *skb; | |
340 | struct net_device_stats *stats = &priv->netdev->stats; | |
341 | ||
342 | /* Error message: | |
343 | * byte 0: Status | |
344 | * byte 1: bit 7: Receive Passive | |
345 | * byte 1: bit 0-6: Receive Error Counter | |
346 | * byte 2: Transmit Error Counter | |
347 | * byte 3: Always 0 (maybe reserved for future use) | |
348 | */ | |
349 | ||
350 | u8 state = msg->data[0]; | |
351 | u8 rxerr = msg->data[1] & USB_8DEV_RP_MASK; | |
352 | u8 txerr = msg->data[2]; | |
353 | int rx_errors = 0; | |
354 | int tx_errors = 0; | |
355 | ||
356 | skb = alloc_can_err_skb(priv->netdev, &cf); | |
357 | if (!skb) | |
358 | return; | |
359 | ||
360 | switch (state) { | |
361 | case USB_8DEV_STATUSMSG_OK: | |
362 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
363 | cf->can_id |= CAN_ERR_PROT; | |
364 | cf->data[2] = CAN_ERR_PROT_ACTIVE; | |
365 | break; | |
366 | case USB_8DEV_STATUSMSG_BUSOFF: | |
367 | priv->can.state = CAN_STATE_BUS_OFF; | |
368 | cf->can_id |= CAN_ERR_BUSOFF; | |
be38a6f9 | 369 | priv->can.can_stats.bus_off++; |
0024d8ad BK |
370 | can_bus_off(priv->netdev); |
371 | break; | |
372 | case USB_8DEV_STATUSMSG_OVERRUN: | |
373 | case USB_8DEV_STATUSMSG_BUSLIGHT: | |
374 | case USB_8DEV_STATUSMSG_BUSHEAVY: | |
375 | cf->can_id |= CAN_ERR_CRTL; | |
376 | break; | |
377 | default: | |
378 | priv->can.state = CAN_STATE_ERROR_WARNING; | |
379 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; | |
380 | priv->can.can_stats.bus_error++; | |
381 | break; | |
382 | } | |
383 | ||
384 | switch (state) { | |
385 | case USB_8DEV_STATUSMSG_OK: | |
386 | case USB_8DEV_STATUSMSG_BUSOFF: | |
387 | break; | |
388 | case USB_8DEV_STATUSMSG_ACK: | |
389 | cf->can_id |= CAN_ERR_ACK; | |
390 | tx_errors = 1; | |
391 | break; | |
392 | case USB_8DEV_STATUSMSG_CRC: | |
ffd461f8 | 393 | cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; |
0024d8ad BK |
394 | rx_errors = 1; |
395 | break; | |
396 | case USB_8DEV_STATUSMSG_BIT0: | |
397 | cf->data[2] |= CAN_ERR_PROT_BIT0; | |
398 | tx_errors = 1; | |
399 | break; | |
400 | case USB_8DEV_STATUSMSG_BIT1: | |
401 | cf->data[2] |= CAN_ERR_PROT_BIT1; | |
402 | tx_errors = 1; | |
403 | break; | |
404 | case USB_8DEV_STATUSMSG_FORM: | |
405 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
406 | rx_errors = 1; | |
407 | break; | |
408 | case USB_8DEV_STATUSMSG_STUFF: | |
409 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
410 | rx_errors = 1; | |
411 | break; | |
412 | case USB_8DEV_STATUSMSG_OVERRUN: | |
413 | cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
414 | stats->rx_over_errors++; | |
415 | rx_errors = 1; | |
416 | break; | |
417 | case USB_8DEV_STATUSMSG_BUSLIGHT: | |
418 | priv->can.state = CAN_STATE_ERROR_WARNING; | |
419 | cf->data[1] = (txerr > rxerr) ? | |
420 | CAN_ERR_CRTL_TX_WARNING : | |
421 | CAN_ERR_CRTL_RX_WARNING; | |
422 | priv->can.can_stats.error_warning++; | |
423 | break; | |
424 | case USB_8DEV_STATUSMSG_BUSHEAVY: | |
425 | priv->can.state = CAN_STATE_ERROR_PASSIVE; | |
426 | cf->data[1] = (txerr > rxerr) ? | |
427 | CAN_ERR_CRTL_TX_PASSIVE : | |
428 | CAN_ERR_CRTL_RX_PASSIVE; | |
429 | priv->can.can_stats.error_passive++; | |
430 | break; | |
431 | default: | |
432 | netdev_warn(priv->netdev, | |
433 | "Unknown status/error message (%d)\n", state); | |
434 | break; | |
435 | } | |
436 | ||
437 | if (tx_errors) { | |
438 | cf->data[2] |= CAN_ERR_PROT_TX; | |
439 | stats->tx_errors++; | |
440 | } | |
441 | ||
442 | if (rx_errors) | |
443 | stats->rx_errors++; | |
444 | ||
445 | cf->data[6] = txerr; | |
446 | cf->data[7] = rxerr; | |
447 | ||
448 | priv->bec.txerr = txerr; | |
449 | priv->bec.rxerr = rxerr; | |
450 | ||
0024d8ad | 451 | stats->rx_packets++; |
c7b74967 | 452 | stats->rx_bytes += cf->len; |
9b721a4c | 453 | netif_rx(skb); |
0024d8ad BK |
454 | } |
455 | ||
456 | /* Read data and status frames */ | |
457 | static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv, | |
458 | struct usb_8dev_rx_msg *msg) | |
459 | { | |
460 | struct can_frame *cf; | |
461 | struct sk_buff *skb; | |
462 | struct net_device_stats *stats = &priv->netdev->stats; | |
463 | ||
464 | if (msg->type == USB_8DEV_TYPE_ERROR_FRAME && | |
465 | msg->flags == USB_8DEV_ERR_FLAG) { | |
466 | usb_8dev_rx_err_msg(priv, msg); | |
467 | } else if (msg->type == USB_8DEV_TYPE_CAN_FRAME) { | |
468 | skb = alloc_can_skb(priv->netdev, &cf); | |
469 | if (!skb) | |
470 | return; | |
471 | ||
472 | cf->can_id = be32_to_cpu(msg->id); | |
c7b74967 | 473 | cf->len = can_cc_dlc2len(msg->dlc & 0xF); |
0024d8ad BK |
474 | |
475 | if (msg->flags & USB_8DEV_EXTID) | |
476 | cf->can_id |= CAN_EFF_FLAG; | |
477 | ||
478 | if (msg->flags & USB_8DEV_RTR) | |
479 | cf->can_id |= CAN_RTR_FLAG; | |
480 | else | |
c7b74967 | 481 | memcpy(cf->data, msg->data, cf->len); |
0024d8ad | 482 | |
0024d8ad | 483 | stats->rx_packets++; |
c7b74967 | 484 | stats->rx_bytes += cf->len; |
9b721a4c | 485 | netif_rx(skb); |
e2d5f2c7 BK |
486 | |
487 | can_led_event(priv->netdev, CAN_LED_EVENT_RX); | |
0024d8ad BK |
488 | } else { |
489 | netdev_warn(priv->netdev, "frame type %d unknown", | |
490 | msg->type); | |
491 | } | |
492 | ||
493 | } | |
494 | ||
495 | /* Callback for reading data from device | |
496 | * | |
497 | * Check urb status, call read function and resubmit urb read operation. | |
498 | */ | |
499 | static void usb_8dev_read_bulk_callback(struct urb *urb) | |
500 | { | |
501 | struct usb_8dev_priv *priv = urb->context; | |
502 | struct net_device *netdev; | |
503 | int retval; | |
504 | int pos = 0; | |
505 | ||
506 | netdev = priv->netdev; | |
507 | ||
508 | if (!netif_device_present(netdev)) | |
509 | return; | |
510 | ||
511 | switch (urb->status) { | |
512 | case 0: /* success */ | |
513 | break; | |
514 | ||
515 | case -ENOENT: | |
12147edc MK |
516 | case -EPIPE: |
517 | case -EPROTO: | |
0024d8ad BK |
518 | case -ESHUTDOWN: |
519 | return; | |
520 | ||
521 | default: | |
522 | netdev_info(netdev, "Rx URB aborted (%d)\n", | |
523 | urb->status); | |
524 | goto resubmit_urb; | |
525 | } | |
526 | ||
527 | while (pos < urb->actual_length) { | |
528 | struct usb_8dev_rx_msg *msg; | |
529 | ||
530 | if (pos + sizeof(struct usb_8dev_rx_msg) > urb->actual_length) { | |
531 | netdev_err(priv->netdev, "format error\n"); | |
532 | break; | |
533 | } | |
534 | ||
535 | msg = (struct usb_8dev_rx_msg *)(urb->transfer_buffer + pos); | |
536 | usb_8dev_rx_can_msg(priv, msg); | |
537 | ||
538 | pos += sizeof(struct usb_8dev_rx_msg); | |
539 | } | |
540 | ||
541 | resubmit_urb: | |
542 | usb_fill_bulk_urb(urb, priv->udev, | |
543 | usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_RX), | |
544 | urb->transfer_buffer, RX_BUFFER_SIZE, | |
545 | usb_8dev_read_bulk_callback, priv); | |
546 | ||
547 | retval = usb_submit_urb(urb, GFP_ATOMIC); | |
548 | ||
549 | if (retval == -ENODEV) | |
550 | netif_device_detach(netdev); | |
551 | else if (retval) | |
552 | netdev_err(netdev, | |
553 | "failed resubmitting read bulk urb: %d\n", retval); | |
554 | } | |
555 | ||
556 | /* Callback handler for write operations | |
557 | * | |
558 | * Free allocated buffers, check transmit status and | |
559 | * calculate statistic. | |
560 | */ | |
561 | static void usb_8dev_write_bulk_callback(struct urb *urb) | |
562 | { | |
563 | struct usb_8dev_tx_urb_context *context = urb->context; | |
564 | struct usb_8dev_priv *priv; | |
565 | struct net_device *netdev; | |
566 | ||
567 | BUG_ON(!context); | |
568 | ||
569 | priv = context->priv; | |
570 | netdev = priv->netdev; | |
571 | ||
572 | /* free up our allocated buffer */ | |
573 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, | |
574 | urb->transfer_buffer, urb->transfer_dma); | |
575 | ||
576 | atomic_dec(&priv->active_tx_urbs); | |
577 | ||
578 | if (!netif_device_present(netdev)) | |
579 | return; | |
580 | ||
581 | if (urb->status) | |
582 | netdev_info(netdev, "Tx URB aborted (%d)\n", | |
583 | urb->status); | |
584 | ||
585 | netdev->stats.tx_packets++; | |
586 | netdev->stats.tx_bytes += context->dlc; | |
587 | ||
588 | can_get_echo_skb(netdev, context->echo_index); | |
589 | ||
e2d5f2c7 BK |
590 | can_led_event(netdev, CAN_LED_EVENT_TX); |
591 | ||
0024d8ad BK |
592 | /* Release context */ |
593 | context->echo_index = MAX_TX_URBS; | |
594 | ||
595 | netif_wake_queue(netdev); | |
596 | } | |
597 | ||
598 | /* Send data to device */ | |
599 | static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb, | |
600 | struct net_device *netdev) | |
601 | { | |
602 | struct usb_8dev_priv *priv = netdev_priv(netdev); | |
603 | struct net_device_stats *stats = &netdev->stats; | |
604 | struct can_frame *cf = (struct can_frame *) skb->data; | |
605 | struct usb_8dev_tx_msg *msg; | |
606 | struct urb *urb; | |
607 | struct usb_8dev_tx_urb_context *context = NULL; | |
608 | u8 *buf; | |
609 | int i, err; | |
610 | size_t size = sizeof(struct usb_8dev_tx_msg); | |
611 | ||
612 | if (can_dropped_invalid_skb(netdev, skb)) | |
613 | return NETDEV_TX_OK; | |
614 | ||
615 | /* create a URB, and a buffer for it, and copy the data to the URB */ | |
616 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
7fe7cfa4 | 617 | if (!urb) |
0024d8ad | 618 | goto nomem; |
0024d8ad BK |
619 | |
620 | buf = usb_alloc_coherent(priv->udev, size, GFP_ATOMIC, | |
621 | &urb->transfer_dma); | |
622 | if (!buf) { | |
623 | netdev_err(netdev, "No memory left for USB buffer\n"); | |
624 | goto nomembuf; | |
625 | } | |
626 | ||
627 | memset(buf, 0, size); | |
628 | ||
629 | msg = (struct usb_8dev_tx_msg *)buf; | |
630 | msg->begin = USB_8DEV_DATA_START; | |
631 | msg->flags = 0x00; | |
632 | ||
633 | if (cf->can_id & CAN_RTR_FLAG) | |
634 | msg->flags |= USB_8DEV_RTR; | |
635 | ||
636 | if (cf->can_id & CAN_EFF_FLAG) | |
637 | msg->flags |= USB_8DEV_EXTID; | |
638 | ||
639 | msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK); | |
c7b74967 OH |
640 | msg->dlc = cf->len; |
641 | memcpy(msg->data, cf->data, cf->len); | |
0024d8ad BK |
642 | msg->end = USB_8DEV_DATA_END; |
643 | ||
644 | for (i = 0; i < MAX_TX_URBS; i++) { | |
645 | if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { | |
646 | context = &priv->tx_contexts[i]; | |
647 | break; | |
648 | } | |
649 | } | |
650 | ||
651 | /* May never happen! When this happens we'd more URBs in flight as | |
652 | * allowed (MAX_TX_URBS). | |
653 | */ | |
654 | if (!context) | |
655 | goto nofreecontext; | |
656 | ||
657 | context->priv = priv; | |
658 | context->echo_index = i; | |
c7b74967 | 659 | context->dlc = cf->len; |
0024d8ad BK |
660 | |
661 | usb_fill_bulk_urb(urb, priv->udev, | |
662 | usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_TX), | |
663 | buf, size, usb_8dev_write_bulk_callback, context); | |
664 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
665 | usb_anchor_urb(urb, &priv->tx_submitted); | |
666 | ||
667 | can_put_echo_skb(skb, netdev, context->echo_index); | |
668 | ||
669 | atomic_inc(&priv->active_tx_urbs); | |
670 | ||
671 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
672 | if (unlikely(err)) | |
673 | goto failed; | |
674 | else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS) | |
675 | /* Slow down tx path */ | |
676 | netif_stop_queue(netdev); | |
677 | ||
678 | /* Release our reference to this URB, the USB core will eventually free | |
679 | * it entirely. | |
680 | */ | |
681 | usb_free_urb(urb); | |
682 | ||
683 | return NETDEV_TX_OK; | |
684 | ||
685 | nofreecontext: | |
0024d8ad | 686 | usb_free_coherent(priv->udev, size, buf, urb->transfer_dma); |
636d0375 | 687 | usb_free_urb(urb); |
0024d8ad BK |
688 | |
689 | netdev_warn(netdev, "couldn't find free context"); | |
690 | ||
691 | return NETDEV_TX_BUSY; | |
692 | ||
693 | failed: | |
694 | can_free_echo_skb(netdev, context->echo_index); | |
695 | ||
696 | usb_unanchor_urb(urb); | |
697 | usb_free_coherent(priv->udev, size, buf, urb->transfer_dma); | |
698 | ||
699 | atomic_dec(&priv->active_tx_urbs); | |
700 | ||
701 | if (err == -ENODEV) | |
702 | netif_device_detach(netdev); | |
703 | else | |
704 | netdev_warn(netdev, "failed tx_urb %d\n", err); | |
705 | ||
706 | nomembuf: | |
707 | usb_free_urb(urb); | |
708 | ||
709 | nomem: | |
710 | dev_kfree_skb(skb); | |
711 | stats->tx_dropped++; | |
712 | ||
713 | return NETDEV_TX_OK; | |
714 | } | |
715 | ||
716 | static int usb_8dev_get_berr_counter(const struct net_device *netdev, | |
717 | struct can_berr_counter *bec) | |
718 | { | |
719 | struct usb_8dev_priv *priv = netdev_priv(netdev); | |
720 | ||
721 | bec->txerr = priv->bec.txerr; | |
722 | bec->rxerr = priv->bec.rxerr; | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
727 | /* Start USB device */ | |
728 | static int usb_8dev_start(struct usb_8dev_priv *priv) | |
729 | { | |
730 | struct net_device *netdev = priv->netdev; | |
731 | int err, i; | |
732 | ||
733 | for (i = 0; i < MAX_RX_URBS; i++) { | |
734 | struct urb *urb = NULL; | |
735 | u8 *buf; | |
736 | ||
737 | /* create a URB, and a buffer for it */ | |
738 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
739 | if (!urb) { | |
0024d8ad BK |
740 | err = -ENOMEM; |
741 | break; | |
742 | } | |
743 | ||
744 | buf = usb_alloc_coherent(priv->udev, RX_BUFFER_SIZE, GFP_KERNEL, | |
745 | &urb->transfer_dma); | |
746 | if (!buf) { | |
747 | netdev_err(netdev, "No memory left for USB buffer\n"); | |
748 | usb_free_urb(urb); | |
749 | err = -ENOMEM; | |
750 | break; | |
751 | } | |
752 | ||
753 | usb_fill_bulk_urb(urb, priv->udev, | |
754 | usb_rcvbulkpipe(priv->udev, | |
755 | USB_8DEV_ENDP_DATA_RX), | |
756 | buf, RX_BUFFER_SIZE, | |
757 | usb_8dev_read_bulk_callback, priv); | |
758 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
759 | usb_anchor_urb(urb, &priv->rx_submitted); | |
760 | ||
761 | err = usb_submit_urb(urb, GFP_KERNEL); | |
762 | if (err) { | |
763 | usb_unanchor_urb(urb); | |
764 | usb_free_coherent(priv->udev, RX_BUFFER_SIZE, buf, | |
765 | urb->transfer_dma); | |
76719868 | 766 | usb_free_urb(urb); |
0024d8ad BK |
767 | break; |
768 | } | |
769 | ||
770 | /* Drop reference, USB core will take care of freeing it */ | |
771 | usb_free_urb(urb); | |
772 | } | |
773 | ||
774 | /* Did we submit any URBs */ | |
775 | if (i == 0) { | |
776 | netdev_warn(netdev, "couldn't setup read URBs\n"); | |
777 | return err; | |
778 | } | |
779 | ||
780 | /* Warn if we've couldn't transmit all the URBs */ | |
781 | if (i < MAX_RX_URBS) | |
782 | netdev_warn(netdev, "rx performance may be slow\n"); | |
783 | ||
784 | err = usb_8dev_cmd_open(priv); | |
785 | if (err) | |
786 | goto failed; | |
787 | ||
788 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
789 | ||
790 | return 0; | |
791 | ||
792 | failed: | |
793 | if (err == -ENODEV) | |
794 | netif_device_detach(priv->netdev); | |
795 | ||
796 | netdev_warn(netdev, "couldn't submit control: %d\n", err); | |
797 | ||
798 | return err; | |
799 | } | |
800 | ||
801 | /* Open USB device */ | |
802 | static int usb_8dev_open(struct net_device *netdev) | |
803 | { | |
804 | struct usb_8dev_priv *priv = netdev_priv(netdev); | |
805 | int err; | |
806 | ||
807 | /* common open */ | |
808 | err = open_candev(netdev); | |
809 | if (err) | |
810 | return err; | |
811 | ||
e2d5f2c7 BK |
812 | can_led_event(netdev, CAN_LED_EVENT_OPEN); |
813 | ||
0024d8ad BK |
814 | /* finally start device */ |
815 | err = usb_8dev_start(priv); | |
816 | if (err) { | |
817 | if (err == -ENODEV) | |
818 | netif_device_detach(priv->netdev); | |
819 | ||
820 | netdev_warn(netdev, "couldn't start device: %d\n", | |
821 | err); | |
822 | ||
823 | close_candev(netdev); | |
824 | ||
825 | return err; | |
826 | } | |
827 | ||
828 | netif_start_queue(netdev); | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
833 | static void unlink_all_urbs(struct usb_8dev_priv *priv) | |
834 | { | |
835 | int i; | |
836 | ||
837 | usb_kill_anchored_urbs(&priv->rx_submitted); | |
838 | ||
839 | usb_kill_anchored_urbs(&priv->tx_submitted); | |
840 | atomic_set(&priv->active_tx_urbs, 0); | |
841 | ||
842 | for (i = 0; i < MAX_TX_URBS; i++) | |
843 | priv->tx_contexts[i].echo_index = MAX_TX_URBS; | |
844 | } | |
845 | ||
846 | /* Close USB device */ | |
847 | static int usb_8dev_close(struct net_device *netdev) | |
848 | { | |
849 | struct usb_8dev_priv *priv = netdev_priv(netdev); | |
850 | int err = 0; | |
851 | ||
852 | /* Send CLOSE command to CAN controller */ | |
853 | err = usb_8dev_cmd_close(priv); | |
854 | if (err) | |
855 | netdev_warn(netdev, "couldn't stop device"); | |
856 | ||
857 | priv->can.state = CAN_STATE_STOPPED; | |
858 | ||
859 | netif_stop_queue(netdev); | |
860 | ||
861 | /* Stop polling */ | |
862 | unlink_all_urbs(priv); | |
863 | ||
864 | close_candev(netdev); | |
865 | ||
e2d5f2c7 BK |
866 | can_led_event(netdev, CAN_LED_EVENT_STOP); |
867 | ||
0024d8ad BK |
868 | return err; |
869 | } | |
870 | ||
871 | static const struct net_device_ops usb_8dev_netdev_ops = { | |
872 | .ndo_open = usb_8dev_open, | |
873 | .ndo_stop = usb_8dev_close, | |
874 | .ndo_start_xmit = usb_8dev_start_xmit, | |
c971fa2a | 875 | .ndo_change_mtu = can_change_mtu, |
0024d8ad BK |
876 | }; |
877 | ||
878 | static const struct can_bittiming_const usb_8dev_bittiming_const = { | |
879 | .name = "usb_8dev", | |
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 | | |
931 | CAN_CTRLMODE_ONE_SHOT; | |
932 | ||
933 | netdev->netdev_ops = &usb_8dev_netdev_ops; | |
934 | ||
935 | netdev->flags |= IFF_ECHO; /* we support local echo */ | |
936 | ||
937 | init_usb_anchor(&priv->rx_submitted); | |
938 | ||
939 | init_usb_anchor(&priv->tx_submitted); | |
940 | atomic_set(&priv->active_tx_urbs, 0); | |
941 | ||
942 | for (i = 0; i < MAX_TX_URBS; i++) | |
943 | priv->tx_contexts[i].echo_index = MAX_TX_URBS; | |
944 | ||
7c426313 MKB |
945 | priv->cmd_msg_buffer = devm_kzalloc(&intf->dev, sizeof(struct usb_8dev_cmd_msg), |
946 | GFP_KERNEL); | |
09da6c5f | 947 | if (!priv->cmd_msg_buffer) |
0024d8ad | 948 | goto cleanup_candev; |
0024d8ad BK |
949 | |
950 | usb_set_intfdata(intf, priv); | |
951 | ||
952 | SET_NETDEV_DEV(netdev, &intf->dev); | |
953 | ||
954 | mutex_init(&priv->usb_8dev_cmd_lock); | |
955 | ||
956 | err = register_candev(netdev); | |
957 | if (err) { | |
958 | netdev_err(netdev, | |
959 | "couldn't register CAN device: %d\n", err); | |
7c426313 | 960 | goto cleanup_candev; |
0024d8ad BK |
961 | } |
962 | ||
963 | err = usb_8dev_cmd_version(priv, &version); | |
964 | if (err) { | |
965 | netdev_err(netdev, "can't get firmware version\n"); | |
4afe2156 | 966 | goto cleanup_unregister_candev; |
0024d8ad BK |
967 | } else { |
968 | netdev_info(netdev, | |
969 | "firmware: %d.%d, hardware: %d.%d\n", | |
970 | (version>>24) & 0xff, (version>>16) & 0xff, | |
971 | (version>>8) & 0xff, version & 0xff); | |
972 | } | |
973 | ||
e2d5f2c7 BK |
974 | devm_can_led_init(netdev); |
975 | ||
0024d8ad BK |
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 = { | |
1006 | .name = "usb_8dev", | |
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"); |