Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 1 | /* |
| 2 | * CAN driver for EMS Dr. Thomas Wuensche CPC-USB/ARM7 |
| 3 | * |
| 4 | * Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License as published |
| 8 | * by the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | */ |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 19 | #include <linux/signal.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/netdevice.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 | |
| 29 | MODULE_AUTHOR("Sebastian Haas <haas@ems-wuensche.com>"); |
| 30 | MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces"); |
| 31 | MODULE_LICENSE("GPL v2"); |
| 32 | |
| 33 | /* Control-Values for CPC_Control() Command Subject Selection */ |
| 34 | #define CONTR_CAN_MESSAGE 0x04 |
| 35 | #define CONTR_CAN_STATE 0x0C |
| 36 | #define CONTR_BUS_ERROR 0x1C |
| 37 | |
| 38 | /* Control Command Actions */ |
| 39 | #define CONTR_CONT_OFF 0 |
| 40 | #define CONTR_CONT_ON 1 |
| 41 | #define CONTR_ONCE 2 |
| 42 | |
| 43 | /* Messages from CPC to PC */ |
| 44 | #define CPC_MSG_TYPE_CAN_FRAME 1 /* CAN data frame */ |
| 45 | #define CPC_MSG_TYPE_RTR_FRAME 8 /* CAN remote frame */ |
| 46 | #define CPC_MSG_TYPE_CAN_PARAMS 12 /* Actual CAN parameters */ |
| 47 | #define CPC_MSG_TYPE_CAN_STATE 14 /* CAN state message */ |
| 48 | #define CPC_MSG_TYPE_EXT_CAN_FRAME 16 /* Extended CAN data frame */ |
| 49 | #define CPC_MSG_TYPE_EXT_RTR_FRAME 17 /* Extended remote frame */ |
| 50 | #define CPC_MSG_TYPE_CONTROL 19 /* change interface behavior */ |
| 51 | #define CPC_MSG_TYPE_CONFIRM 20 /* command processed confirmation */ |
| 52 | #define CPC_MSG_TYPE_OVERRUN 21 /* overrun events */ |
| 53 | #define CPC_MSG_TYPE_CAN_FRAME_ERROR 23 /* detected bus errors */ |
| 54 | #define CPC_MSG_TYPE_ERR_COUNTER 25 /* RX/TX error counter */ |
| 55 | |
| 56 | /* Messages from the PC to the CPC interface */ |
| 57 | #define CPC_CMD_TYPE_CAN_FRAME 1 /* CAN data frame */ |
| 58 | #define CPC_CMD_TYPE_CONTROL 3 /* control of interface behavior */ |
| 59 | #define CPC_CMD_TYPE_CAN_PARAMS 6 /* set CAN parameters */ |
| 60 | #define CPC_CMD_TYPE_RTR_FRAME 13 /* CAN remote frame */ |
| 61 | #define CPC_CMD_TYPE_CAN_STATE 14 /* CAN state message */ |
| 62 | #define CPC_CMD_TYPE_EXT_CAN_FRAME 15 /* Extended CAN data frame */ |
| 63 | #define CPC_CMD_TYPE_EXT_RTR_FRAME 16 /* Extended CAN remote frame */ |
| 64 | #define CPC_CMD_TYPE_CAN_EXIT 200 /* exit the CAN */ |
| 65 | |
| 66 | #define CPC_CMD_TYPE_INQ_ERR_COUNTER 25 /* request the CAN error counters */ |
| 67 | #define CPC_CMD_TYPE_CLEAR_MSG_QUEUE 8 /* clear CPC_MSG queue */ |
| 68 | #define CPC_CMD_TYPE_CLEAR_CMD_QUEUE 28 /* clear CPC_CMD queue */ |
| 69 | |
| 70 | #define CPC_CC_TYPE_SJA1000 2 /* Philips basic CAN controller */ |
| 71 | |
| 72 | #define CPC_CAN_ECODE_ERRFRAME 0x01 /* Ecode type */ |
| 73 | |
| 74 | /* Overrun types */ |
| 75 | #define CPC_OVR_EVENT_CAN 0x01 |
| 76 | #define CPC_OVR_EVENT_CANSTATE 0x02 |
| 77 | #define CPC_OVR_EVENT_BUSERROR 0x04 |
| 78 | |
| 79 | /* |
| 80 | * If the CAN controller lost a message we indicate it with the highest bit |
| 81 | * set in the count field. |
| 82 | */ |
| 83 | #define CPC_OVR_HW 0x80 |
| 84 | |
| 85 | /* Size of the "struct ems_cpc_msg" without the union */ |
| 86 | #define CPC_MSG_HEADER_LEN 11 |
| 87 | #define CPC_CAN_MSG_MIN_SIZE 5 |
| 88 | |
| 89 | /* Define these values to match your devices */ |
| 90 | #define USB_CPCUSB_VENDOR_ID 0x12D6 |
| 91 | |
| 92 | #define USB_CPCUSB_ARM7_PRODUCT_ID 0x0444 |
| 93 | |
| 94 | /* Mode register NXP LPC2119/SJA1000 CAN Controller */ |
| 95 | #define SJA1000_MOD_NORMAL 0x00 |
| 96 | #define SJA1000_MOD_RM 0x01 |
| 97 | |
| 98 | /* ECC register NXP LPC2119/SJA1000 CAN Controller */ |
| 99 | #define SJA1000_ECC_SEG 0x1F |
| 100 | #define SJA1000_ECC_DIR 0x20 |
| 101 | #define SJA1000_ECC_ERR 0x06 |
| 102 | #define SJA1000_ECC_BIT 0x00 |
| 103 | #define SJA1000_ECC_FORM 0x40 |
| 104 | #define SJA1000_ECC_STUFF 0x80 |
| 105 | #define SJA1000_ECC_MASK 0xc0 |
| 106 | |
| 107 | /* Status register content */ |
| 108 | #define SJA1000_SR_BS 0x80 |
| 109 | #define SJA1000_SR_ES 0x40 |
| 110 | |
| 111 | #define SJA1000_DEFAULT_OUTPUT_CONTROL 0xDA |
| 112 | |
| 113 | /* |
| 114 | * The device actually uses a 16MHz clock to generate the CAN clock |
| 115 | * but it expects SJA1000 bit settings based on 8MHz (is internally |
| 116 | * converted). |
| 117 | */ |
| 118 | #define EMS_USB_ARM7_CLOCK 8000000 |
| 119 | |
| 120 | /* |
| 121 | * CAN-Message representation in a CPC_MSG. Message object type is |
| 122 | * CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or |
| 123 | * CPC_MSG_TYPE_EXT_CAN_FRAME or CPC_MSG_TYPE_EXT_RTR_FRAME. |
| 124 | */ |
| 125 | struct cpc_can_msg { |
Gerhard Uttenthaler | 8a4b5b0 | 2015-03-24 19:02:29 +0100 | [diff] [blame] | 126 | __le32 id; |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 127 | u8 length; |
| 128 | u8 msg[8]; |
| 129 | }; |
| 130 | |
| 131 | /* Representation of the CAN parameters for the SJA1000 controller */ |
| 132 | struct cpc_sja1000_params { |
| 133 | u8 mode; |
| 134 | u8 acc_code0; |
| 135 | u8 acc_code1; |
| 136 | u8 acc_code2; |
| 137 | u8 acc_code3; |
| 138 | u8 acc_mask0; |
| 139 | u8 acc_mask1; |
| 140 | u8 acc_mask2; |
| 141 | u8 acc_mask3; |
| 142 | u8 btr0; |
| 143 | u8 btr1; |
| 144 | u8 outp_contr; |
| 145 | }; |
| 146 | |
| 147 | /* CAN params message representation */ |
| 148 | struct cpc_can_params { |
| 149 | u8 cc_type; |
| 150 | |
| 151 | /* Will support M16C CAN controller in the future */ |
| 152 | union { |
| 153 | struct cpc_sja1000_params sja1000; |
| 154 | } cc_params; |
| 155 | }; |
| 156 | |
| 157 | /* Structure for confirmed message handling */ |
| 158 | struct cpc_confirm { |
| 159 | u8 error; /* error code */ |
| 160 | }; |
| 161 | |
| 162 | /* Structure for overrun conditions */ |
| 163 | struct cpc_overrun { |
| 164 | u8 event; |
| 165 | u8 count; |
| 166 | }; |
| 167 | |
| 168 | /* SJA1000 CAN errors (compatible to NXP LPC2119) */ |
| 169 | struct cpc_sja1000_can_error { |
| 170 | u8 ecc; |
| 171 | u8 rxerr; |
| 172 | u8 txerr; |
| 173 | }; |
| 174 | |
| 175 | /* structure for CAN error conditions */ |
| 176 | struct cpc_can_error { |
| 177 | u8 ecode; |
| 178 | |
| 179 | struct { |
| 180 | u8 cc_type; |
| 181 | |
| 182 | /* Other controllers may also provide error code capture regs */ |
| 183 | union { |
| 184 | struct cpc_sja1000_can_error sja1000; |
| 185 | } regs; |
| 186 | } cc; |
| 187 | }; |
| 188 | |
| 189 | /* |
| 190 | * Structure containing RX/TX error counter. This structure is used to request |
| 191 | * the values of the CAN controllers TX and RX error counter. |
| 192 | */ |
| 193 | struct cpc_can_err_counter { |
| 194 | u8 rx; |
| 195 | u8 tx; |
| 196 | }; |
| 197 | |
| 198 | /* Main message type used between library and application */ |
Eric Dumazet | ba2d358 | 2010-06-02 18:10:09 +0000 | [diff] [blame] | 199 | struct __packed ems_cpc_msg { |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 200 | u8 type; /* type of message */ |
| 201 | u8 length; /* length of data within union 'msg' */ |
| 202 | u8 msgid; /* confirmation handle */ |
Marc Kleine-Budde | a0bc163 | 2015-03-25 10:36:17 +0100 | [diff] [blame] | 203 | __le32 ts_sec; /* timestamp in seconds */ |
| 204 | __le32 ts_nsec; /* timestamp in nano seconds */ |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 205 | |
| 206 | union { |
| 207 | u8 generic[64]; |
| 208 | struct cpc_can_msg can_msg; |
| 209 | struct cpc_can_params can_params; |
| 210 | struct cpc_confirm confirmation; |
| 211 | struct cpc_overrun overrun; |
| 212 | struct cpc_can_error error; |
| 213 | struct cpc_can_err_counter err_counter; |
| 214 | u8 can_state; |
| 215 | } msg; |
| 216 | }; |
| 217 | |
| 218 | /* |
| 219 | * Table of devices that work with this driver |
| 220 | * NOTE: This driver supports only CPC-USB/ARM7 (LPC2119) yet. |
| 221 | */ |
| 222 | static struct usb_device_id ems_usb_table[] = { |
| 223 | {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)}, |
| 224 | {} /* Terminating entry */ |
| 225 | }; |
| 226 | |
| 227 | MODULE_DEVICE_TABLE(usb, ems_usb_table); |
| 228 | |
| 229 | #define RX_BUFFER_SIZE 64 |
| 230 | #define CPC_HEADER_SIZE 4 |
| 231 | #define INTR_IN_BUFFER_SIZE 4 |
| 232 | |
| 233 | #define MAX_RX_URBS 10 |
Wolfgang Grandegger | a6e4bc5 | 2009-10-08 22:17:11 +0000 | [diff] [blame] | 234 | #define MAX_TX_URBS 10 |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 235 | |
| 236 | struct ems_usb; |
| 237 | |
| 238 | struct ems_tx_urb_context { |
| 239 | struct ems_usb *dev; |
| 240 | |
| 241 | u32 echo_index; |
| 242 | u8 dlc; |
| 243 | }; |
| 244 | |
| 245 | struct ems_usb { |
| 246 | struct can_priv can; /* must be the first member */ |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 247 | |
| 248 | struct sk_buff *echo_skb[MAX_TX_URBS]; |
| 249 | |
| 250 | struct usb_device *udev; |
| 251 | struct net_device *netdev; |
| 252 | |
| 253 | atomic_t active_tx_urbs; |
| 254 | struct usb_anchor tx_submitted; |
| 255 | struct ems_tx_urb_context tx_contexts[MAX_TX_URBS]; |
| 256 | |
| 257 | struct usb_anchor rx_submitted; |
| 258 | |
| 259 | struct urb *intr_urb; |
| 260 | |
| 261 | u8 *tx_msg_buffer; |
| 262 | |
| 263 | u8 *intr_in_buffer; |
| 264 | unsigned int free_slots; /* remember number of available slots */ |
| 265 | |
| 266 | struct ems_cpc_msg active_params; /* active controller parameters */ |
| 267 | }; |
| 268 | |
| 269 | static void ems_usb_read_interrupt_callback(struct urb *urb) |
| 270 | { |
| 271 | struct ems_usb *dev = urb->context; |
| 272 | struct net_device *netdev = dev->netdev; |
| 273 | int err; |
| 274 | |
| 275 | if (!netif_device_present(netdev)) |
| 276 | return; |
| 277 | |
| 278 | switch (urb->status) { |
| 279 | case 0: |
| 280 | dev->free_slots = dev->intr_in_buffer[1]; |
| 281 | break; |
| 282 | |
| 283 | case -ECONNRESET: /* unlink */ |
| 284 | case -ENOENT: |
| 285 | case -ESHUTDOWN: |
| 286 | return; |
| 287 | |
| 288 | default: |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 289 | netdev_info(netdev, "Rx interrupt aborted %d\n", urb->status); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 290 | break; |
| 291 | } |
| 292 | |
| 293 | err = usb_submit_urb(urb, GFP_ATOMIC); |
| 294 | |
| 295 | if (err == -ENODEV) |
| 296 | netif_device_detach(netdev); |
| 297 | else if (err) |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 298 | netdev_err(netdev, "failed resubmitting intr urb: %d\n", err); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) |
| 302 | { |
| 303 | struct can_frame *cf; |
| 304 | struct sk_buff *skb; |
| 305 | int i; |
| 306 | struct net_device_stats *stats = &dev->netdev->stats; |
| 307 | |
Wolfgang Grandegger | 7b6856a | 2009-10-20 00:08:01 -0700 | [diff] [blame] | 308 | skb = alloc_can_skb(dev->netdev, &cf); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 309 | if (skb == NULL) |
| 310 | return; |
| 311 | |
Sebastian Haas | 2b2072e | 2009-11-04 05:48:33 +0000 | [diff] [blame] | 312 | cf->can_id = le32_to_cpu(msg->msg.can_msg.id); |
Oliver Hartkopp | c7cd606 | 2009-12-12 04:13:21 +0000 | [diff] [blame] | 313 | cf->can_dlc = get_can_dlc(msg->msg.can_msg.length & 0xF); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 314 | |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 315 | if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME || |
| 316 | msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 317 | cf->can_id |= CAN_EFF_FLAG; |
| 318 | |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 319 | if (msg->type == CPC_MSG_TYPE_RTR_FRAME || |
| 320 | msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) { |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 321 | cf->can_id |= CAN_RTR_FLAG; |
| 322 | } else { |
| 323 | for (i = 0; i < cf->can_dlc; i++) |
| 324 | cf->data[i] = msg->msg.can_msg.msg[i]; |
| 325 | } |
| 326 | |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 327 | stats->rx_packets++; |
| 328 | stats->rx_bytes += cf->can_dlc; |
Marc Kleine-Budde | 43c021e | 2015-07-11 21:16:08 +0200 | [diff] [blame] | 329 | netif_rx(skb); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 330 | } |
| 331 | |
| 332 | static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg) |
| 333 | { |
| 334 | struct can_frame *cf; |
| 335 | struct sk_buff *skb; |
| 336 | struct net_device_stats *stats = &dev->netdev->stats; |
| 337 | |
Wolfgang Grandegger | 7b6856a | 2009-10-20 00:08:01 -0700 | [diff] [blame] | 338 | skb = alloc_can_err_skb(dev->netdev, &cf); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 339 | if (skb == NULL) |
| 340 | return; |
| 341 | |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 342 | if (msg->type == CPC_MSG_TYPE_CAN_STATE) { |
| 343 | u8 state = msg->msg.can_state; |
| 344 | |
| 345 | if (state & SJA1000_SR_BS) { |
| 346 | dev->can.state = CAN_STATE_BUS_OFF; |
| 347 | cf->can_id |= CAN_ERR_BUSOFF; |
| 348 | |
Andri Yngvason | be38a6f | 2015-01-16 14:30:28 +0000 | [diff] [blame] | 349 | dev->can.can_stats.bus_off++; |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 350 | can_bus_off(dev->netdev); |
| 351 | } else if (state & SJA1000_SR_ES) { |
| 352 | dev->can.state = CAN_STATE_ERROR_WARNING; |
| 353 | dev->can.can_stats.error_warning++; |
| 354 | } else { |
| 355 | dev->can.state = CAN_STATE_ERROR_ACTIVE; |
| 356 | dev->can.can_stats.error_passive++; |
| 357 | } |
| 358 | } else if (msg->type == CPC_MSG_TYPE_CAN_FRAME_ERROR) { |
| 359 | u8 ecc = msg->msg.error.cc.regs.sja1000.ecc; |
| 360 | u8 txerr = msg->msg.error.cc.regs.sja1000.txerr; |
| 361 | u8 rxerr = msg->msg.error.cc.regs.sja1000.rxerr; |
| 362 | |
| 363 | /* bus error interrupt */ |
| 364 | dev->can.can_stats.bus_error++; |
| 365 | stats->rx_errors++; |
| 366 | |
| 367 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; |
| 368 | |
| 369 | switch (ecc & SJA1000_ECC_MASK) { |
| 370 | case SJA1000_ECC_BIT: |
| 371 | cf->data[2] |= CAN_ERR_PROT_BIT; |
| 372 | break; |
| 373 | case SJA1000_ECC_FORM: |
| 374 | cf->data[2] |= CAN_ERR_PROT_FORM; |
| 375 | break; |
| 376 | case SJA1000_ECC_STUFF: |
| 377 | cf->data[2] |= CAN_ERR_PROT_STUFF; |
| 378 | break; |
| 379 | default: |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 380 | cf->data[3] = ecc & SJA1000_ECC_SEG; |
| 381 | break; |
| 382 | } |
| 383 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 384 | /* Error occurred during transmission? */ |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 385 | if ((ecc & SJA1000_ECC_DIR) == 0) |
| 386 | cf->data[2] |= CAN_ERR_PROT_TX; |
| 387 | |
| 388 | if (dev->can.state == CAN_STATE_ERROR_WARNING || |
| 389 | dev->can.state == CAN_STATE_ERROR_PASSIVE) { |
| 390 | cf->data[1] = (txerr > rxerr) ? |
| 391 | CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE; |
| 392 | } |
| 393 | } else if (msg->type == CPC_MSG_TYPE_OVERRUN) { |
| 394 | cf->can_id |= CAN_ERR_CRTL; |
| 395 | cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; |
| 396 | |
| 397 | stats->rx_over_errors++; |
| 398 | stats->rx_errors++; |
| 399 | } |
| 400 | |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 401 | stats->rx_packets++; |
| 402 | stats->rx_bytes += cf->can_dlc; |
Marc Kleine-Budde | 43c021e | 2015-07-11 21:16:08 +0200 | [diff] [blame] | 403 | netif_rx(skb); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | /* |
| 407 | * callback for bulk IN urb |
| 408 | */ |
| 409 | static void ems_usb_read_bulk_callback(struct urb *urb) |
| 410 | { |
| 411 | struct ems_usb *dev = urb->context; |
| 412 | struct net_device *netdev; |
| 413 | int retval; |
| 414 | |
| 415 | netdev = dev->netdev; |
| 416 | |
| 417 | if (!netif_device_present(netdev)) |
| 418 | return; |
| 419 | |
| 420 | switch (urb->status) { |
| 421 | case 0: /* success */ |
| 422 | break; |
| 423 | |
| 424 | case -ENOENT: |
| 425 | return; |
| 426 | |
| 427 | default: |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 428 | netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 429 | goto resubmit_urb; |
| 430 | } |
| 431 | |
| 432 | if (urb->actual_length > CPC_HEADER_SIZE) { |
| 433 | struct ems_cpc_msg *msg; |
| 434 | u8 *ibuf = urb->transfer_buffer; |
Sudip Mukherjee | 4e2061b | 2014-11-18 19:17:06 +0530 | [diff] [blame] | 435 | u8 msg_count, start; |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 436 | |
| 437 | msg_count = ibuf[0] & ~0x80; |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 438 | |
| 439 | start = CPC_HEADER_SIZE; |
| 440 | |
| 441 | while (msg_count) { |
| 442 | msg = (struct ems_cpc_msg *)&ibuf[start]; |
| 443 | |
| 444 | switch (msg->type) { |
| 445 | case CPC_MSG_TYPE_CAN_STATE: |
| 446 | /* Process CAN state changes */ |
| 447 | ems_usb_rx_err(dev, msg); |
| 448 | break; |
| 449 | |
| 450 | case CPC_MSG_TYPE_CAN_FRAME: |
| 451 | case CPC_MSG_TYPE_EXT_CAN_FRAME: |
| 452 | case CPC_MSG_TYPE_RTR_FRAME: |
| 453 | case CPC_MSG_TYPE_EXT_RTR_FRAME: |
| 454 | ems_usb_rx_can_msg(dev, msg); |
| 455 | break; |
| 456 | |
| 457 | case CPC_MSG_TYPE_CAN_FRAME_ERROR: |
| 458 | /* Process errorframe */ |
| 459 | ems_usb_rx_err(dev, msg); |
| 460 | break; |
| 461 | |
| 462 | case CPC_MSG_TYPE_OVERRUN: |
| 463 | /* Message lost while receiving */ |
| 464 | ems_usb_rx_err(dev, msg); |
| 465 | break; |
| 466 | } |
| 467 | |
| 468 | start += CPC_MSG_HEADER_LEN + msg->length; |
| 469 | msg_count--; |
| 470 | |
| 471 | if (start > urb->transfer_buffer_length) { |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 472 | netdev_err(netdev, "format error\n"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 473 | break; |
| 474 | } |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | resubmit_urb: |
| 479 | usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2), |
| 480 | urb->transfer_buffer, RX_BUFFER_SIZE, |
| 481 | ems_usb_read_bulk_callback, dev); |
| 482 | |
| 483 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
| 484 | |
| 485 | if (retval == -ENODEV) |
| 486 | netif_device_detach(netdev); |
| 487 | else if (retval) |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 488 | netdev_err(netdev, |
| 489 | "failed resubmitting read bulk urb: %d\n", retval); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | /* |
| 493 | * callback for bulk IN urb |
| 494 | */ |
| 495 | static void ems_usb_write_bulk_callback(struct urb *urb) |
| 496 | { |
| 497 | struct ems_tx_urb_context *context = urb->context; |
| 498 | struct ems_usb *dev; |
| 499 | struct net_device *netdev; |
| 500 | |
| 501 | BUG_ON(!context); |
| 502 | |
| 503 | dev = context->dev; |
| 504 | netdev = dev->netdev; |
| 505 | |
| 506 | /* free up our allocated buffer */ |
Daniel Mack | 997ea58 | 2010-04-12 13:17:25 +0200 | [diff] [blame] | 507 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
| 508 | urb->transfer_buffer, urb->transfer_dma); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 509 | |
| 510 | atomic_dec(&dev->active_tx_urbs); |
| 511 | |
| 512 | if (!netif_device_present(netdev)) |
| 513 | return; |
| 514 | |
| 515 | if (urb->status) |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 516 | netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 517 | |
| 518 | netdev->trans_start = jiffies; |
| 519 | |
| 520 | /* transmission complete interrupt */ |
| 521 | netdev->stats.tx_packets++; |
| 522 | netdev->stats.tx_bytes += context->dlc; |
| 523 | |
| 524 | can_get_echo_skb(netdev, context->echo_index); |
| 525 | |
| 526 | /* Release context */ |
| 527 | context->echo_index = MAX_TX_URBS; |
| 528 | |
| 529 | if (netif_queue_stopped(netdev)) |
| 530 | netif_wake_queue(netdev); |
| 531 | } |
| 532 | |
| 533 | /* |
| 534 | * Send the given CPC command synchronously |
| 535 | */ |
| 536 | static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) |
| 537 | { |
| 538 | int actual_length; |
| 539 | |
| 540 | /* Copy payload */ |
| 541 | memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg, |
| 542 | msg->length + CPC_MSG_HEADER_LEN); |
| 543 | |
| 544 | /* Clear header */ |
| 545 | memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE); |
| 546 | |
| 547 | return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2), |
| 548 | &dev->tx_msg_buffer[0], |
| 549 | msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE, |
| 550 | &actual_length, 1000); |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * Change CAN controllers' mode register |
| 555 | */ |
| 556 | static int ems_usb_write_mode(struct ems_usb *dev, u8 mode) |
| 557 | { |
| 558 | dev->active_params.msg.can_params.cc_params.sja1000.mode = mode; |
| 559 | |
| 560 | return ems_usb_command_msg(dev, &dev->active_params); |
| 561 | } |
| 562 | |
| 563 | /* |
| 564 | * Send a CPC_Control command to change behaviour when interface receives a CAN |
| 565 | * message, bus error or CAN state changed notifications. |
| 566 | */ |
| 567 | static int ems_usb_control_cmd(struct ems_usb *dev, u8 val) |
| 568 | { |
| 569 | struct ems_cpc_msg cmd; |
| 570 | |
| 571 | cmd.type = CPC_CMD_TYPE_CONTROL; |
| 572 | cmd.length = CPC_MSG_HEADER_LEN + 1; |
| 573 | |
| 574 | cmd.msgid = 0; |
| 575 | |
| 576 | cmd.msg.generic[0] = val; |
| 577 | |
| 578 | return ems_usb_command_msg(dev, &cmd); |
| 579 | } |
| 580 | |
| 581 | /* |
| 582 | * Start interface |
| 583 | */ |
| 584 | static int ems_usb_start(struct ems_usb *dev) |
| 585 | { |
| 586 | struct net_device *netdev = dev->netdev; |
| 587 | int err, i; |
| 588 | |
| 589 | dev->intr_in_buffer[0] = 0; |
| 590 | dev->free_slots = 15; /* initial size */ |
| 591 | |
| 592 | for (i = 0; i < MAX_RX_URBS; i++) { |
| 593 | struct urb *urb = NULL; |
| 594 | u8 *buf = NULL; |
| 595 | |
| 596 | /* create a URB, and a buffer for it */ |
| 597 | urb = usb_alloc_urb(0, GFP_KERNEL); |
| 598 | if (!urb) { |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 599 | netdev_err(netdev, "No memory left for URBs\n"); |
Sebastian Haas | 2ee6850 | 2011-12-22 23:58:34 +0100 | [diff] [blame] | 600 | err = -ENOMEM; |
| 601 | break; |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 602 | } |
| 603 | |
Daniel Mack | 997ea58 | 2010-04-12 13:17:25 +0200 | [diff] [blame] | 604 | buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, |
| 605 | &urb->transfer_dma); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 606 | if (!buf) { |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 607 | netdev_err(netdev, "No memory left for USB buffer\n"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 608 | usb_free_urb(urb); |
Sebastian Haas | 2ee6850 | 2011-12-22 23:58:34 +0100 | [diff] [blame] | 609 | err = -ENOMEM; |
| 610 | break; |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 611 | } |
| 612 | |
| 613 | usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2), |
| 614 | buf, RX_BUFFER_SIZE, |
| 615 | ems_usb_read_bulk_callback, dev); |
| 616 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| 617 | usb_anchor_urb(urb, &dev->rx_submitted); |
| 618 | |
| 619 | err = usb_submit_urb(urb, GFP_KERNEL); |
| 620 | if (err) { |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 621 | usb_unanchor_urb(urb); |
Daniel Mack | 997ea58 | 2010-04-12 13:17:25 +0200 | [diff] [blame] | 622 | usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, |
| 623 | urb->transfer_dma); |
Alexey Khoroshilov | a1c31f1 | 2013-12-07 03:10:35 +0400 | [diff] [blame] | 624 | usb_free_urb(urb); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 625 | break; |
| 626 | } |
| 627 | |
| 628 | /* Drop reference, USB core will take care of freeing it */ |
| 629 | usb_free_urb(urb); |
| 630 | } |
| 631 | |
| 632 | /* Did we submit any URBs */ |
| 633 | if (i == 0) { |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 634 | netdev_warn(netdev, "couldn't setup read URBs\n"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 635 | return err; |
| 636 | } |
| 637 | |
| 638 | /* Warn if we've couldn't transmit all the URBs */ |
| 639 | if (i < MAX_RX_URBS) |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 640 | netdev_warn(netdev, "rx performance may be slow\n"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 641 | |
| 642 | /* Setup and start interrupt URB */ |
| 643 | usb_fill_int_urb(dev->intr_urb, dev->udev, |
| 644 | usb_rcvintpipe(dev->udev, 1), |
| 645 | dev->intr_in_buffer, |
| 646 | INTR_IN_BUFFER_SIZE, |
| 647 | ems_usb_read_interrupt_callback, dev, 1); |
| 648 | |
| 649 | err = usb_submit_urb(dev->intr_urb, GFP_KERNEL); |
| 650 | if (err) { |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 651 | netdev_warn(netdev, "intr URB submit failed: %d\n", err); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 652 | |
| 653 | return err; |
| 654 | } |
| 655 | |
| 656 | /* CPC-USB will transfer received message to host */ |
| 657 | err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON); |
| 658 | if (err) |
| 659 | goto failed; |
| 660 | |
| 661 | /* CPC-USB will transfer CAN state changes to host */ |
| 662 | err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON); |
| 663 | if (err) |
| 664 | goto failed; |
| 665 | |
| 666 | /* CPC-USB will transfer bus errors to host */ |
| 667 | err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON); |
| 668 | if (err) |
| 669 | goto failed; |
| 670 | |
| 671 | err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL); |
| 672 | if (err) |
| 673 | goto failed; |
| 674 | |
| 675 | dev->can.state = CAN_STATE_ERROR_ACTIVE; |
| 676 | |
| 677 | return 0; |
| 678 | |
| 679 | failed: |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 680 | netdev_warn(netdev, "couldn't submit control: %d\n", err); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 681 | |
| 682 | return err; |
| 683 | } |
| 684 | |
| 685 | static void unlink_all_urbs(struct ems_usb *dev) |
| 686 | { |
| 687 | int i; |
| 688 | |
| 689 | usb_unlink_urb(dev->intr_urb); |
| 690 | |
| 691 | usb_kill_anchored_urbs(&dev->rx_submitted); |
| 692 | |
| 693 | usb_kill_anchored_urbs(&dev->tx_submitted); |
| 694 | atomic_set(&dev->active_tx_urbs, 0); |
| 695 | |
| 696 | for (i = 0; i < MAX_TX_URBS; i++) |
| 697 | dev->tx_contexts[i].echo_index = MAX_TX_URBS; |
| 698 | } |
| 699 | |
| 700 | static int ems_usb_open(struct net_device *netdev) |
| 701 | { |
| 702 | struct ems_usb *dev = netdev_priv(netdev); |
| 703 | int err; |
| 704 | |
| 705 | err = ems_usb_write_mode(dev, SJA1000_MOD_RM); |
| 706 | if (err) |
| 707 | return err; |
| 708 | |
| 709 | /* common open */ |
| 710 | err = open_candev(netdev); |
| 711 | if (err) |
| 712 | return err; |
| 713 | |
| 714 | /* finally start device */ |
| 715 | err = ems_usb_start(dev); |
| 716 | if (err) { |
| 717 | if (err == -ENODEV) |
| 718 | netif_device_detach(dev->netdev); |
| 719 | |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 720 | netdev_warn(netdev, "couldn't start device: %d\n", err); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 721 | |
| 722 | close_candev(netdev); |
| 723 | |
| 724 | return err; |
| 725 | } |
| 726 | |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 727 | |
| 728 | netif_start_queue(netdev); |
| 729 | |
| 730 | return 0; |
| 731 | } |
| 732 | |
| 733 | static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev) |
| 734 | { |
| 735 | struct ems_usb *dev = netdev_priv(netdev); |
| 736 | struct ems_tx_urb_context *context = NULL; |
| 737 | struct net_device_stats *stats = &netdev->stats; |
| 738 | struct can_frame *cf = (struct can_frame *)skb->data; |
| 739 | struct ems_cpc_msg *msg; |
| 740 | struct urb *urb; |
| 741 | u8 *buf; |
| 742 | int i, err; |
| 743 | size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN |
| 744 | + sizeof(struct cpc_can_msg); |
| 745 | |
Oliver Hartkopp | 3ccd4c6 | 2010-01-12 02:00:46 -0800 | [diff] [blame] | 746 | if (can_dropped_invalid_skb(netdev, skb)) |
| 747 | return NETDEV_TX_OK; |
| 748 | |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 749 | /* create a URB, and a buffer for it, and copy the data to the URB */ |
| 750 | urb = usb_alloc_urb(0, GFP_ATOMIC); |
| 751 | if (!urb) { |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 752 | netdev_err(netdev, "No memory left for URBs\n"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 753 | goto nomem; |
| 754 | } |
| 755 | |
Daniel Mack | 997ea58 | 2010-04-12 13:17:25 +0200 | [diff] [blame] | 756 | buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 757 | if (!buf) { |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 758 | netdev_err(netdev, "No memory left for USB buffer\n"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 759 | usb_free_urb(urb); |
| 760 | goto nomem; |
| 761 | } |
| 762 | |
| 763 | msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE]; |
| 764 | |
Gerhard Uttenthaler | 8a4b5b0 | 2015-03-24 19:02:29 +0100 | [diff] [blame] | 765 | msg->msg.can_msg.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 766 | msg->msg.can_msg.length = cf->can_dlc; |
| 767 | |
| 768 | if (cf->can_id & CAN_RTR_FLAG) { |
| 769 | msg->type = cf->can_id & CAN_EFF_FLAG ? |
| 770 | CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME; |
| 771 | |
| 772 | msg->length = CPC_CAN_MSG_MIN_SIZE; |
| 773 | } else { |
| 774 | msg->type = cf->can_id & CAN_EFF_FLAG ? |
| 775 | CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME; |
| 776 | |
| 777 | for (i = 0; i < cf->can_dlc; i++) |
| 778 | msg->msg.can_msg.msg[i] = cf->data[i]; |
| 779 | |
| 780 | msg->length = CPC_CAN_MSG_MIN_SIZE + cf->can_dlc; |
| 781 | } |
| 782 | |
| 783 | for (i = 0; i < MAX_TX_URBS; i++) { |
| 784 | if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) { |
| 785 | context = &dev->tx_contexts[i]; |
| 786 | break; |
| 787 | } |
| 788 | } |
| 789 | |
| 790 | /* |
| 791 | * May never happen! When this happens we'd more URBs in flight as |
| 792 | * allowed (MAX_TX_URBS). |
| 793 | */ |
| 794 | if (!context) { |
Daniel Mack | 997ea58 | 2010-04-12 13:17:25 +0200 | [diff] [blame] | 795 | usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); |
Alexey Khoroshilov | a1c31f1 | 2013-12-07 03:10:35 +0400 | [diff] [blame] | 796 | usb_free_urb(urb); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 797 | |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 798 | netdev_warn(netdev, "couldn't find free context\n"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 799 | |
| 800 | return NETDEV_TX_BUSY; |
| 801 | } |
| 802 | |
| 803 | context->dev = dev; |
| 804 | context->echo_index = i; |
| 805 | context->dlc = cf->can_dlc; |
| 806 | |
| 807 | usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, |
| 808 | size, ems_usb_write_bulk_callback, context); |
| 809 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| 810 | usb_anchor_urb(urb, &dev->tx_submitted); |
| 811 | |
| 812 | can_put_echo_skb(skb, netdev, context->echo_index); |
| 813 | |
| 814 | atomic_inc(&dev->active_tx_urbs); |
| 815 | |
| 816 | err = usb_submit_urb(urb, GFP_ATOMIC); |
| 817 | if (unlikely(err)) { |
| 818 | can_free_echo_skb(netdev, context->echo_index); |
| 819 | |
| 820 | usb_unanchor_urb(urb); |
Daniel Mack | 997ea58 | 2010-04-12 13:17:25 +0200 | [diff] [blame] | 821 | usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 822 | dev_kfree_skb(skb); |
| 823 | |
| 824 | atomic_dec(&dev->active_tx_urbs); |
| 825 | |
| 826 | if (err == -ENODEV) { |
| 827 | netif_device_detach(netdev); |
| 828 | } else { |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 829 | netdev_warn(netdev, "failed tx_urb %d\n", err); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 830 | |
| 831 | stats->tx_dropped++; |
| 832 | } |
| 833 | } else { |
| 834 | netdev->trans_start = jiffies; |
| 835 | |
| 836 | /* Slow down tx path */ |
| 837 | if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS || |
| 838 | dev->free_slots < 5) { |
| 839 | netif_stop_queue(netdev); |
| 840 | } |
| 841 | } |
| 842 | |
| 843 | /* |
| 844 | * Release our reference to this URB, the USB core will eventually free |
| 845 | * it entirely. |
| 846 | */ |
| 847 | usb_free_urb(urb); |
| 848 | |
| 849 | return NETDEV_TX_OK; |
| 850 | |
| 851 | nomem: |
Dan Carpenter | ea3fb37 | 2010-03-06 01:11:38 +0000 | [diff] [blame] | 852 | dev_kfree_skb(skb); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 853 | stats->tx_dropped++; |
| 854 | |
| 855 | return NETDEV_TX_OK; |
| 856 | } |
| 857 | |
| 858 | static int ems_usb_close(struct net_device *netdev) |
| 859 | { |
| 860 | struct ems_usb *dev = netdev_priv(netdev); |
| 861 | |
| 862 | /* Stop polling */ |
| 863 | unlink_all_urbs(dev); |
| 864 | |
| 865 | netif_stop_queue(netdev); |
| 866 | |
| 867 | /* Set CAN controller to reset mode */ |
| 868 | if (ems_usb_write_mode(dev, SJA1000_MOD_RM)) |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 869 | netdev_warn(netdev, "couldn't stop device"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 870 | |
| 871 | close_candev(netdev); |
| 872 | |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 873 | return 0; |
| 874 | } |
| 875 | |
| 876 | static const struct net_device_ops ems_usb_netdev_ops = { |
| 877 | .ndo_open = ems_usb_open, |
| 878 | .ndo_stop = ems_usb_close, |
| 879 | .ndo_start_xmit = ems_usb_start_xmit, |
Oliver Hartkopp | c971fa2 | 2014-03-07 09:23:41 +0100 | [diff] [blame] | 880 | .ndo_change_mtu = can_change_mtu, |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 881 | }; |
| 882 | |
Marc Kleine-Budde | 194b9a4 | 2012-07-16 12:58:31 +0200 | [diff] [blame] | 883 | static const struct can_bittiming_const ems_usb_bittiming_const = { |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 884 | .name = "ems_usb", |
| 885 | .tseg1_min = 1, |
| 886 | .tseg1_max = 16, |
| 887 | .tseg2_min = 1, |
| 888 | .tseg2_max = 8, |
| 889 | .sjw_max = 4, |
| 890 | .brp_min = 1, |
| 891 | .brp_max = 64, |
| 892 | .brp_inc = 1, |
| 893 | }; |
| 894 | |
| 895 | static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode) |
| 896 | { |
| 897 | struct ems_usb *dev = netdev_priv(netdev); |
| 898 | |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 899 | switch (mode) { |
| 900 | case CAN_MODE_START: |
| 901 | if (ems_usb_write_mode(dev, SJA1000_MOD_NORMAL)) |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 902 | netdev_warn(netdev, "couldn't start device"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 903 | |
| 904 | if (netif_queue_stopped(netdev)) |
| 905 | netif_wake_queue(netdev); |
| 906 | break; |
| 907 | |
| 908 | default: |
| 909 | return -EOPNOTSUPP; |
| 910 | } |
| 911 | |
| 912 | return 0; |
| 913 | } |
| 914 | |
| 915 | static int ems_usb_set_bittiming(struct net_device *netdev) |
| 916 | { |
| 917 | struct ems_usb *dev = netdev_priv(netdev); |
| 918 | struct can_bittiming *bt = &dev->can.bittiming; |
| 919 | u8 btr0, btr1; |
| 920 | |
| 921 | btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); |
| 922 | btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | |
| 923 | (((bt->phase_seg2 - 1) & 0x7) << 4); |
| 924 | if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) |
| 925 | btr1 |= 0x80; |
| 926 | |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 927 | netdev_info(netdev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 928 | |
| 929 | dev->active_params.msg.can_params.cc_params.sja1000.btr0 = btr0; |
| 930 | dev->active_params.msg.can_params.cc_params.sja1000.btr1 = btr1; |
| 931 | |
| 932 | return ems_usb_command_msg(dev, &dev->active_params); |
| 933 | } |
| 934 | |
| 935 | static void init_params_sja1000(struct ems_cpc_msg *msg) |
| 936 | { |
| 937 | struct cpc_sja1000_params *sja1000 = |
| 938 | &msg->msg.can_params.cc_params.sja1000; |
| 939 | |
| 940 | msg->type = CPC_CMD_TYPE_CAN_PARAMS; |
| 941 | msg->length = sizeof(struct cpc_can_params); |
| 942 | msg->msgid = 0; |
| 943 | |
| 944 | msg->msg.can_params.cc_type = CPC_CC_TYPE_SJA1000; |
| 945 | |
| 946 | /* Acceptance filter open */ |
| 947 | sja1000->acc_code0 = 0x00; |
| 948 | sja1000->acc_code1 = 0x00; |
| 949 | sja1000->acc_code2 = 0x00; |
| 950 | sja1000->acc_code3 = 0x00; |
| 951 | |
| 952 | /* Acceptance filter open */ |
| 953 | sja1000->acc_mask0 = 0xFF; |
| 954 | sja1000->acc_mask1 = 0xFF; |
| 955 | sja1000->acc_mask2 = 0xFF; |
| 956 | sja1000->acc_mask3 = 0xFF; |
| 957 | |
| 958 | sja1000->btr0 = 0; |
| 959 | sja1000->btr1 = 0; |
| 960 | |
| 961 | sja1000->outp_contr = SJA1000_DEFAULT_OUTPUT_CONTROL; |
| 962 | sja1000->mode = SJA1000_MOD_RM; |
| 963 | } |
| 964 | |
| 965 | /* |
| 966 | * probe function for new CPC-USB devices |
| 967 | */ |
| 968 | static int ems_usb_probe(struct usb_interface *intf, |
| 969 | const struct usb_device_id *id) |
| 970 | { |
| 971 | struct net_device *netdev; |
| 972 | struct ems_usb *dev; |
| 973 | int i, err = -ENOMEM; |
| 974 | |
Wolfgang Grandegger | a6e4bc5 | 2009-10-08 22:17:11 +0000 | [diff] [blame] | 975 | netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 976 | if (!netdev) { |
Hans J. Koch | 1c0b28b | 2010-04-21 00:18:06 +0000 | [diff] [blame] | 977 | dev_err(&intf->dev, "ems_usb: Couldn't alloc candev\n"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 978 | return -ENOMEM; |
| 979 | } |
| 980 | |
| 981 | dev = netdev_priv(netdev); |
| 982 | |
| 983 | dev->udev = interface_to_usbdev(intf); |
| 984 | dev->netdev = netdev; |
| 985 | |
| 986 | dev->can.state = CAN_STATE_STOPPED; |
| 987 | dev->can.clock.freq = EMS_USB_ARM7_CLOCK; |
| 988 | dev->can.bittiming_const = &ems_usb_bittiming_const; |
| 989 | dev->can.do_set_bittiming = ems_usb_set_bittiming; |
| 990 | dev->can.do_set_mode = ems_usb_set_mode; |
Christian Pellegrin | ad72c34 | 2010-01-14 07:08:34 +0000 | [diff] [blame] | 991 | dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 992 | |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 993 | netdev->netdev_ops = &ems_usb_netdev_ops; |
| 994 | |
| 995 | netdev->flags |= IFF_ECHO; /* we support local echo */ |
| 996 | |
| 997 | init_usb_anchor(&dev->rx_submitted); |
| 998 | |
| 999 | init_usb_anchor(&dev->tx_submitted); |
| 1000 | atomic_set(&dev->active_tx_urbs, 0); |
| 1001 | |
| 1002 | for (i = 0; i < MAX_TX_URBS; i++) |
| 1003 | dev->tx_contexts[i].echo_index = MAX_TX_URBS; |
| 1004 | |
| 1005 | dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 1006 | if (!dev->intr_urb) { |
Hans J. Koch | 1c0b28b | 2010-04-21 00:18:06 +0000 | [diff] [blame] | 1007 | dev_err(&intf->dev, "Couldn't alloc intr URB\n"); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 1008 | goto cleanup_candev; |
| 1009 | } |
| 1010 | |
| 1011 | dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL); |
Joe Perches | 09da6c5 | 2013-02-03 17:28:09 +0000 | [diff] [blame] | 1012 | if (!dev->intr_in_buffer) |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 1013 | goto cleanup_intr_urb; |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 1014 | |
| 1015 | dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE + |
| 1016 | sizeof(struct ems_cpc_msg), GFP_KERNEL); |
Joe Perches | 14f8dc4 | 2013-02-07 11:46:27 +0000 | [diff] [blame] | 1017 | if (!dev->tx_msg_buffer) |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 1018 | goto cleanup_intr_in_buffer; |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 1019 | |
| 1020 | usb_set_intfdata(intf, dev); |
| 1021 | |
| 1022 | SET_NETDEV_DEV(netdev, &intf->dev); |
| 1023 | |
| 1024 | init_params_sja1000(&dev->active_params); |
| 1025 | |
| 1026 | err = ems_usb_command_msg(dev, &dev->active_params); |
| 1027 | if (err) { |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 1028 | netdev_err(netdev, "couldn't initialize controller: %d\n", err); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 1029 | goto cleanup_tx_msg_buffer; |
| 1030 | } |
| 1031 | |
| 1032 | err = register_candev(netdev); |
| 1033 | if (err) { |
Wolfgang Grandegger | aabdfd6 | 2012-02-01 11:02:05 +0100 | [diff] [blame] | 1034 | netdev_err(netdev, "couldn't register CAN device: %d\n", err); |
Sebastian Haas | 702171a | 2009-09-16 02:04:20 +0000 | [diff] [blame] | 1035 | goto cleanup_tx_msg_buffer; |
| 1036 | } |
| 1037 | |
| 1038 | return 0; |
| 1039 | |
| 1040 | cleanup_tx_msg_buffer: |
| 1041 | kfree(dev->tx_msg_buffer); |
| 1042 | |
| 1043 | cleanup_intr_in_buffer: |
| 1044 | kfree(dev->intr_in_buffer); |
| 1045 | |
| 1046 | cleanup_intr_urb: |
| 1047 | usb_free_urb(dev->intr_urb); |
| 1048 | |
| 1049 | cleanup_candev: |
| 1050 | free_candev(netdev); |
| 1051 | |
| 1052 | return err; |
| 1053 | } |
| 1054 | |
| 1055 | /* |
| 1056 | * called by the usb core when the device is removed from the system |
| 1057 | */ |
| 1058 | static void ems_usb_disconnect(struct usb_interface *intf) |
| 1059 | { |
| 1060 | struct ems_usb *dev = usb_get_intfdata(intf); |
| 1061 | |
| 1062 | usb_set_intfdata(intf, NULL); |
| 1063 | |
| 1064 | if (dev) { |
| 1065 | unregister_netdev(dev->netdev); |
| 1066 | free_candev(dev->netdev); |
| 1067 | |
| 1068 | unlink_all_urbs(dev); |
| 1069 | |
| 1070 | usb_free_urb(dev->intr_urb); |
| 1071 | |
| 1072 | kfree(dev->intr_in_buffer); |
| 1073 | } |
| 1074 | } |
| 1075 | |
| 1076 | /* usb specific object needed to register this driver with the usb subsystem */ |
| 1077 | static struct usb_driver ems_usb_driver = { |
| 1078 | .name = "ems_usb", |
| 1079 | .probe = ems_usb_probe, |
| 1080 | .disconnect = ems_usb_disconnect, |
| 1081 | .id_table = ems_usb_table, |
| 1082 | }; |
| 1083 | |
Greg Kroah-Hartman | d632eb1 | 2011-11-18 09:44:20 -0800 | [diff] [blame] | 1084 | module_usb_driver(ems_usb_driver); |