diff options
Diffstat (limited to 'canconfig.c')
| -rw-r--r-- | canconfig.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/canconfig.c b/canconfig.c new file mode 100644 index 0000000..c10ef13 --- /dev/null +++ b/canconfig.c @@ -0,0 +1,274 @@ +/*** + * + * canconfig.c + * + * Copyright (C) 2005 Marc Kleine-Budde <mkl@pengutronix.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <termios.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <net/if.h> +#include <netinet/in.h> +#include <netinet/ether.h> + +#include "can.h" + + +#define MIN(a, b) ((a) < (b) ? (a) : (b)) + +int s; +struct ifreq ifr; + +struct speed_map { + unsigned short speed; + unsigned short value; +}; + +static const struct speed_map speeds[] = { + {CAN_BAUD_10K, 10}, + {CAN_BAUD_20K, 20}, + {CAN_BAUD_50K, 50}, + {CAN_BAUD_100K, 100}, + {CAN_BAUD_125K, 125}, + {CAN_BAUD_250K, 250}, + {CAN_BAUD_500K, 500}, + {CAN_BAUD_800K, 800}, + {CAN_BAUD_1M, 1000}, +}; + +static const int NUM_SPEEDS = (sizeof(speeds) / sizeof(struct speed_map)); + +unsigned long can_baud_to_value(speed_t speed) +{ + int i = 0; + + do { + if (speed == speeds[i].speed) { + return speeds[i].value; + } + } while (++i < NUM_SPEEDS); + + return 0; +} + +speed_t can_value_to_baud(unsigned long value) +{ + int i = 0; + + do { + if (value == can_baud_to_value(speeds[i].speed)) { + return speeds[i].speed; + } + } while (++i < NUM_SPEEDS); + + return (speed_t)-1; +} + + +void help(void) +{ + fprintf(stderr, "usage:\n\t" + "canconfig <dev> baudrate { BR | BTR }\n\t\t" + "BR := { 10 | 20 | 50 | 100 | 125 | 250 | 500 | 800 | 1000 }\n\t\t" + "BTR := btr <btr0> [ <btr1> [ <btr2> ] ]\n\t" + "canconfig <dev> mode MODE\n\t\t" + "MODE := { start }\n\t" + "canconfig <dev> state\n" + ); + + exit(EXIT_FAILURE); +} + + +void do_show_baudrate(int argc, char* argv[]) +{ + struct can_baudrate *br = (struct can_baudrate *)&ifr.ifr_ifru; + int i, value; + + i = ioctl(s, SIOCGCANBAUDRATE, &ifr); + if (i < 0) { + perror("ioctl"); + exit(EXIT_FAILURE); + } + + value = can_baud_to_value(br->baudrate); + + if (value != 0) + fprintf(stdout, + "%s: baudrate %d btr 0x%02x 0x%02x 0x%02x\n", + &ifr.ifr_name, value, br->btr[0], br->btr[1], br->btr[2]); + else + fprintf(stdout, + "%s: baudrate <unknown> btr 0x%02x 0x%02x 0x%02x\n", + &ifr.ifr_name, br->btr[0], br->btr[1], br->btr[2]); +} + + +void do_set_baudrate(int argc, char* argv[]) +{ + struct can_baudrate *br = (struct can_baudrate *)&ifr.ifr_ifru; + speed_t baudrate; + int value, i; + + if (!strcmp(argv[3], "btr")) { + if (argc < 5) + help(); + + br->baudrate = CAN_BAUD_BTR; + for (i = 4; i < MIN(argc, 4 + 3); i++) { + value = strtol(argv[i], NULL, 0); + br->btr[i-4] = value; + } + } else { + value = atoi(argv[3]); + baudrate = can_value_to_baud(value); + if ( baudrate == -1) { + fprintf(stderr, "invalid baudrate\n"); + exit(EXIT_FAILURE); + } + br->baudrate = baudrate; + } + + i = ioctl(s, SIOCSCANBAUDRATE, &ifr); + if (i < 0) { + perror("ioctl"); + exit(EXIT_FAILURE); + } +} + + +void cmd_baudrate(int argc, char *argv[]) +{ + if (argc >= 4) { + do_set_baudrate(argc, argv); + } + do_show_baudrate(argc, argv); + + exit(EXIT_SUCCESS); +} + + +void cmd_mode(int argc, char *argv[]) +{ + union can_settings *settings = (union can_settings *)&ifr.ifr_ifru; + int i; + + if (argc < 4 ) + help(); + + if (!strcmp(argv[3], "start")) { + settings->mode = CAN_MODE_START; + } else { + help(); + } + + i = ioctl(s, SIOCSCANMODE, &ifr); + if (i < 0) { + perror("ioctl"); + exit(EXIT_FAILURE); + } + + exit(EXIT_SUCCESS); +} + + +void do_show_state(int argc, char *argv[]) +{ + union can_settings *settings = (union can_settings *)&ifr.ifr_ifru; + enum CAN_STATE state; + char *str; + int i; + + i = ioctl(s, SIOCGCANSTATE, &ifr); + if (i < 0) { + perror("ioctl"); + exit(EXIT_FAILURE); + } + + state = settings->state; + fprintf(stdout, "%s: state ", &ifr.ifr_name); + switch (state) { + case CAN_STATE_BUS_PASSIVE: + str = "bus passive"; + break; + case CAN_STATE_ACTIVE: + str = "active"; + break; + case CAN_STATE_BUS_OFF: + str = "bus off"; + break; + default: + str = "<unknown>"; + } + fprintf(stdout, "%s \n", str); + + exit(EXIT_SUCCESS); +} + + +void cmd_state(int argc, char *argv[]) +{ + do_show_state(argc, argv); + + exit(EXIT_SUCCESS); +} + + +void cmd_show_interface(int argc, char *argv[]) +{ + do_show_baudrate(argc, argv); + do_show_state(argc, argv); + + exit(EXIT_SUCCESS); +} + + +int main(int argc, char *argv[]) +{ + if ((argc < 2) || !strcmp(argv[1], "--help")) + help(); + + if ((s = socket(AF_CAN, SOCK_RAW, 0)) < 0) { + perror("socket"); + exit(EXIT_FAILURE); + } + + strncpy(ifr.ifr_name, argv[1], IFNAMSIZ); + + if (argc < 3) + cmd_show_interface(argc, argv); + + if (!strcmp(argv[2], "baudrate")) + cmd_baudrate(argc, argv); + if (!strcmp(argv[2], "mode")) + cmd_mode(argc, argv); + if (!strcmp(argv[2], "state")) + cmd_state(argc, argv); + + help(); + + return 0; +} |