X-Git-Url: http://rtime.felk.cvut.cz/gitweb/linux-lin.git/blobdiff_plain/97214b074c29c5e3b2951bb1514291710c77b5ba..80aea4bca67842a43f24e098be3204d2dda6383d:/sllin/sllin.c diff --git a/sllin/sllin.c b/sllin/sllin.c index aa4adec..750d489 100644 --- a/sllin/sllin.c +++ b/sllin/sllin.c @@ -1,11 +1,8 @@ /* * sllin.c - serial line LIN interface driver (using tty line discipline) * - * This file is derived from linux/drivers/net/slip.c - * - * slip.c Authors : Laurence Culhane - * Fred N. van Kempen - * sllin.c Author : Oliver Hartkopp + * This file is derived from drivers/net/can/slcan.c + * slcan.c Author: Oliver Hartkopp * * 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 @@ -39,6 +36,8 @@ * */ +#define DEBUG 1 /* Enables pr_debug() printouts */ + #include #include @@ -58,9 +57,11 @@ #include #include #include +#include /* Should be in include/linux/tty.h */ #define N_SLLIN 25 +/* -------------------------------- */ static __initdata const char banner[] = KERN_INFO "sllin: serial line LIN interface driver\n"; @@ -68,10 +69,10 @@ static __initdata const char banner[] = MODULE_ALIAS_LDISC(N_SLLIN); MODULE_DESCRIPTION("serial line LIN interface"); MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Oliver Hartkopp "); +MODULE_AUTHOR(""); #define SLLIN_MAGIC 0x53CA -// #define BREAK_BY_BAUD +/* #define BREAK_BY_BAUD */ static int maxdev = 10; /* MAX number of SLLIN channels; This can be overridden with @@ -88,14 +89,45 @@ MODULE_PARM_DESC(maxdev, "Maximum number of sllin interfaces"); #define SLLIN_BUFF_ID 2 #define SLLIN_BUFF_DATA 3 +#define SLLIN_ID_MASK 0x3f +#define SLLIN_ID_MAX SLLIN_ID_MASK +#define SLLIN_CTRL_FRAME CAN_EFF_FLAG + +#define SLLIN_SAMPLES_PER_CHAR 10 +#define SLLIN_CHARS_TO_TIMEOUT 12 + enum slstate { SLSTATE_IDLE = 0, SLSTATE_BREAK_SENT, SLSTATE_ID_SENT, - SLSTATE_RESPONSE_WAIT, + SLSTATE_RESPONSE_WAIT, /* Wait for response */ + SLSTATE_RESPONSE_WAIT_BUS, /* Wait for response from LIN bus + only (CAN frames from network stack + are not processed in this moment) */ SLSTATE_RESPONSE_SENT, }; +struct sllin_conf_entry { + int dlc; /* Length of data in LIN frame */ +#define SLLIN_CANFR_FLAGS_OFFS 6 /* Lower 6 bits in can_id correspond to LIN ID */ +/* Save configuration for particular LIN ID */ +#define SLLIN_LIN_ID_CONF (1 << SLLIN_CANFR_FLAGS_OFFS) +/* Publisher of particular LIN response is SLLIN Master */ +#define SLLIN_SRC_MASTER (1 << (SLLIN_CANFR_FLAGS_OFFS + 1)) +#define SLLIN_SRC_SLAVE (1 << (SLLIN_CANFR_FLAGS_OFFS + 2)) +#define SLLIN_SLAVE_LOCAL (1 << (SLLIN_CANFR_FLAGS_OFFS + 3)) +#define SLLIN_SLAVE_REMOTE (1 << (SLLIN_CANFR_FLAGS_OFFS + 4)) +#define SLLIN_LOC_SLAVE_CACHE (1 << (SLLIN_CANFR_FLAGS_OFFS + 5)) +#define SLLIN_CHECKSUM_EXTENDED (1 << (SLLIN_CANFR_FLAGS_OFFS + 6)) + +#define SLLIN_ERR_RX_TIMEOUT (1 << (SLLIN_CANFR_FLAGS_OFFS + 7)) +#define SLLIN_ERR_CHECKSUM (1 << (SLLIN_CANFR_FLAGS_OFFS + 8)) +//#define SLLIN_ERR_FRAMING (1 << (SLLIN_CANFR_FLAGS_OFFS + 9)) + + canid_t frame_fl; /* LIN frame flags. Passed from userspace as canid_t data type */ + u8 data[8]; /* LIN frame data payload */ +}; + struct sllin { int magic; @@ -117,6 +149,7 @@ struct sllin { int lin_state; /* state */ char id_to_send; /* there is ID to be sent */ char data_to_send; /* there are data to be sent */ + char resp_len_known; /* Length of the response is known */ unsigned long flags; /* Flag values/ mode etc */ #define SLF_INUSE 0 /* Channel in use */ @@ -124,15 +157,23 @@ struct sllin { #define SLF_RXEVENT 2 /* Rx wake event */ #define SLF_TXEVENT 3 /* Tx wake event */ #define SLF_MSGEVENT 4 /* CAN message to sent */ +#define SLF_TMOUTEVENT 5 /* Timeout on received data */ dev_t line; struct task_struct *kwthread; wait_queue_head_t kwt_wq; + struct hrtimer rx_timer; /* RX timeout timer */ + ktime_t rx_timer_timeout; /* RX timeout timer value */ + struct sk_buff *tx_req_skb; /* Socket buffer with CAN frame received + from network stack*/ - struct sk_buff *rec_skb; /* Socket buffer with received CAN frame */ + struct sllin_conf_entry linfr_cache[SLLIN_ID_MAX + 1]; /* List with configurations for + each of 0 to SLLIN_ID_MAX LIN IDs */ }; static struct net_device **sllin_devs; +static int sllin_configure_frame_cache(struct sllin *sl, struct can_frame *cf); + const unsigned char sllin_id_parity_table[] = { 0x80,0xc0,0x40,0x00,0xc0,0x80,0x00,0x40, @@ -169,123 +210,41 @@ static int sltty_change_speed(struct tty_struct *tty, unsigned speed) } -/* Send one completely decapsulated can_frame to the network layer */ -static void sll_bump(struct sllin *sl) +/* Send one can_frame to the network layer */ +static void sllin_send_canfr(struct sllin *sl, canid_t id, char *data, int len) { -// struct sk_buff *skb; -// struct can_frame cf; -// int i, dlc_pos, tmp; -// unsigned long ultmp; -// char cmd = sl->rbuff[0]; -// -// if ((cmd != 't') && (cmd != 'T') && (cmd != 'r') && (cmd != 'R')) -// return; -// -// if (cmd & 0x20) /* tiny chars 'r' 't' => standard frame format */ -// dlc_pos = 4; /* dlc position tiiid */ -// else -// dlc_pos = 9; /* dlc position Tiiiiiiiid */ -// -// if (!((sl->rbuff[dlc_pos] >= '0') && (sl->rbuff[dlc_pos] < '9'))) -// return; -// -// cf.can_dlc = sl->rbuff[dlc_pos] - '0'; /* get can_dlc from ASCII val */ -// -// sl->rbuff[dlc_pos] = 0; /* terminate can_id string */ -// -// if (strict_strtoul(sl->rbuff+1, 16, &ultmp)) -// return; -// -// cf.can_id = ultmp; -// -// if (!(cmd & 0x20)) /* NO tiny chars => extended frame format */ -// cf.can_id |= CAN_EFF_FLAG; -// -// if ((cmd | 0x20) == 'r') /* RTR frame */ -// cf.can_id |= CAN_RTR_FLAG; -// -// *(u64 *) (&cf.data) = 0; /* clear payload */ -// -// for (i = 0, dlc_pos++; i < cf.can_dlc; i++) { -// -// tmp = asc2nibble(sl->rbuff[dlc_pos++]); -// if (tmp > 0x0F) -// return; -// cf.data[i] = (tmp << 4); -// tmp = asc2nibble(sl->rbuff[dlc_pos++]); -// if (tmp > 0x0F) -// return; -// cf.data[i] |= tmp; -// } -// -// -// skb = dev_alloc_skb(sizeof(struct can_frame)); -// if (!skb) -// return; -// -// skb->dev = sl->dev; -// skb->protocol = htons(ETH_P_CAN); -// skb->pkt_type = PACKET_BROADCAST; -// skb->ip_summed = CHECKSUM_UNNECESSARY; -// memcpy(skb_put(skb, sizeof(struct can_frame)), -// &cf, sizeof(struct can_frame)); -// netif_rx(skb); -// -// sl->dev->stats.rx_packets++; -// sl->dev->stats.rx_bytes += cf.can_dlc; -} + struct sk_buff *skb; + struct can_frame cf; + + cf.can_id = id; + cf.can_dlc = len; + if (cf.can_dlc > 0) { + memcpy(&cf.data, data, cf.can_dlc); + } + + skb = dev_alloc_skb(sizeof(struct can_frame)); + if (!skb) + return; + skb->dev = sl->dev; + skb->protocol = htons(ETH_P_CAN); + skb->pkt_type = PACKET_BROADCAST; + skb->ip_summed = CHECKSUM_UNNECESSARY; + memcpy(skb_put(skb, sizeof(struct can_frame)), + &cf, sizeof(struct can_frame)); + netif_rx(skb); - /************************************************************************ - * STANDARD SLLIN ENCAPSULATION * - ************************************************************************/ + sl->dev->stats.rx_packets++; + sl->dev->stats.rx_bytes += cf.can_dlc; -/* Convert particular CAN frame into LIN frame and send it to TTY queue. */ -static void sll_encaps(struct sllin *sl, struct can_frame *cf) + +} + +static void sll_bump(struct sllin *sl) { -// int actual, idx, i; -// char lframe[16] = {0x00, 0x55}; /* Fake break, Sync byte */ -// struct tty_struct *tty = sl->tty; -// -// pr_debug("sllin: %s() invoked\n", __FUNCTION__); -// -// /* We do care only about SFF frames */ -// if (cf->can_id & CAN_EFF_FLAG) -// return; -// -// /* Send only header */ -// if (cf->can_id & CAN_RTR_FLAG) { -// pr_debug("sllin: %s() RTR CAN frame\n", __FUNCTION__); -// lframe[2] = (u8)cf->can_id; /* Get one byte LIN ID */ -// -// sltty_change_speed(tty, sl->lin_baud * 2 / 3); -// tty->ops->write(tty, &lframe[0], 1); -// sltty_change_speed(tty, sl->lin_baud); -// tty->ops->write(tty, &lframe[1], 1); -// tty->ops->write(tty, &lframe[2], 1); -// } else { -// pr_debug("sllin: %s() non-RTR CAN frame\n", __FUNCTION__); -// /* idx = strlen(sl->xbuff); -// -// for (i = 0; i < cf->can_dlc; i++) -// sprintf(&sl->xbuff[idx + 2*i], "%02X", cf->data[i]); -// -// * Order of next two lines is *very* important. -// * When we are sending a little amount of data, -// * the transfer may be completed inside the ops->write() -// * routine, because it's running with interrupts enabled. -// * In this case we *never* got WRITE_WAKEUP event, -// * if we did not request it before write operation. -// * 14 Oct 1994 Dmitry Gorodchanin. -// -// set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); -// actual = sl->tty->ops->write(sl->tty, sl->xbuff, strlen(sl->xbuff)); -// sl->xleft = strlen(sl->xbuff) - actual; -// sl->xhead = sl->xbuff + actual; -// sl->dev->stats.tx_bytes += cf->can_dlc; -// */ -// } -// + sllin_send_canfr(sl, sl->rx_buff[SLLIN_BUFF_ID] & SLLIN_ID_MASK, + sl->rx_buff + SLLIN_BUFF_DATA, + sl->rx_cnt - SLLIN_BUFF_DATA - 1); /* without checksum */ } /* @@ -312,7 +271,7 @@ static void sllin_write_wakeup(struct tty_struct *tty) sl->tx_cnt += actual; if (sl->tx_cnt < sl->tx_lim) { - printk(KERN_INFO "sllin_write_wakeup sent %d, remains %d, waiting\n", + pr_debug("sllin: sllin_write_wakeup sent %d, remains %d, waiting\n", sl->tx_cnt, sl->tx_lim - sl->tx_cnt); return; } @@ -322,36 +281,44 @@ static void sllin_write_wakeup(struct tty_struct *tty) set_bit(SLF_TXEVENT, &sl->flags); wake_up(&sl->kwt_wq); - printk(KERN_INFO "sllin_write_wakeup sent %d, wakeup\n", sl->tx_cnt); + pr_debug("sllin: sllin_write_wakeup sent %d, wakeup\n", sl->tx_cnt); } /* Send a can_frame to a TTY queue. */ static netdev_tx_t sll_xmit(struct sk_buff *skb, struct net_device *dev) { struct sllin *sl = netdev_priv(dev); + struct can_frame *cf; if (skb->len != sizeof(struct can_frame)) goto err_out; spin_lock(&sl->lock); if (!netif_running(dev)) { - spin_unlock(&sl->lock); printk(KERN_WARNING "%s: xmit: iface is down\n", dev->name); - goto err_out; + goto err_out_unlock; } if (sl->tty == NULL) { - spin_unlock(&sl->lock); - goto err_out; + goto err_out_unlock; + } + + cf = (struct can_frame *) skb->data; + if (cf->can_id & SLLIN_CTRL_FRAME) { + sllin_configure_frame_cache(sl, cf); + goto free_out_unlock; } netif_stop_queue(sl->dev); - sl->rec_skb = skb; + sl->tx_req_skb = skb; set_bit(SLF_MSGEVENT, &sl->flags); wake_up(&sl->kwt_wq); spin_unlock(&sl->lock); return NETDEV_TX_OK; +free_out_unlock: +err_out_unlock: + spin_unlock(&sl->lock); err_out: kfree_skb(skb); return NETDEV_TX_OK; @@ -444,7 +411,7 @@ static void sllin_receive_buf(struct tty_struct *tty, { struct sllin *sl = (struct sllin *) tty->disc_data; - printk(KERN_INFO "sllin_receive_buf invoked\n"); + pr_debug("sllin: sllin_receive_buf invoked\n"); if (!sl || sl->magic != SLLIN_MAGIC || !netif_running(sl->dev)) return; @@ -454,7 +421,7 @@ static void sllin_receive_buf(struct tty_struct *tty, if (fp && *fp++) { if (!test_and_set_bit(SLF_ERROR, &sl->flags)) sl->dev->stats.rx_errors++; - printk(KERN_INFO "sllin_receive_buf char 0x%02x ignored " + pr_debug("sllin: sllin_receive_buf char 0x%02x ignored " "due marker 0x%02x, flags 0x%lx\n", *cp, *(fp-1), sl->flags); cp++; @@ -468,7 +435,7 @@ static void sllin_receive_buf(struct tty_struct *tty, sl->rx_buff[sl->rx_cnt++] = 0x00; } #endif - printk(KERN_INFO "LIN_RX[%d]: 0x%02x\n", sl->rx_cnt, *cp); + pr_debug("sllin: LIN_RX[%d]: 0x%02x\n", sl->rx_cnt, *cp); sl->rx_buff[sl->rx_cnt++] = *cp++; } } @@ -476,26 +443,77 @@ static void sllin_receive_buf(struct tty_struct *tty, if (sl->rx_cnt >= sl->rx_expect) { set_bit(SLF_RXEVENT, &sl->flags); wake_up(&sl->kwt_wq); - printk(KERN_INFO "sllin_receive_buf count %d, wakeup\n", sl->rx_cnt); + pr_debug("sllin: sllin_receive_buf count %d, wakeup\n", sl->rx_cnt); } else { - printk(KERN_INFO "sllin_receive_buf count %d, waiting\n", sl->rx_cnt); + pr_debug("sllin: sllin_receive_buf count %d, waiting\n", sl->rx_cnt); } } /***************************************** * sllin message helper routines *****************************************/ +void sllin_report_error(struct sllin *sl, int err) +{ + sllin_send_canfr(sl, 0 | CAN_EFF_FLAG | + (err & ~SLLIN_ID_MASK), NULL, 0); +} + +static int sllin_configure_frame_cache(struct sllin *sl, struct can_frame *cf) +{ + struct sllin_conf_entry *sce; + if (!(cf->can_id & SLLIN_LIN_ID_CONF)) + return -1; + + sce = &sl->linfr_cache[cf->can_id & SLLIN_ID_MASK]; + pr_debug("sllin: Setting frame cache with EFF CAN frame. " + "LIN ID = %d\n", cf->can_id & SLLIN_ID_MASK); + + sce->dlc = cf->can_dlc; + if (sce->dlc > SLLIN_DATA_MAX) + sce->dlc = SLLIN_DATA_MAX; + + sce->frame_fl = (cf->can_id & ~SLLIN_ID_MASK) & CAN_EFF_MASK; + memcpy(sce->data, cf->data, cf->can_dlc); + + return 0; +} + +static inline unsigned sllin_checksum(unsigned char *data, int length, int enhanced_fl) +{ + unsigned csum = 0; + int i; + + if (enhanced_fl) { + i = SLLIN_BUFF_ID; + } else { + i = SLLIN_BUFF_DATA; + } + + for (; i < length; i++) { + csum += data[i]; + if (csum > 255) + csum -= 255; + } + + return ~csum & 0xff; +} + +#define SLLIN_STPMSG_RESPONLY (1) /* Message will be LIN Response only */ +#define SLLIN_STPMSG_CHCKSUM_CLS (1 << 1) +#define SLLIN_STPMSG_CHCKSUM_ENH (1 << 2) int sllin_setup_msg(struct sllin *sl, int mode, int id, unsigned char *data, int len) { - if (id > 0x3f) + if (id > SLLIN_ID_MASK) return -1; - sl->rx_cnt = 0; - sl->tx_cnt = 0; - sl->rx_expect = 0; - sl->rx_lim = SLLIN_BUFF_LEN; + if (!(mode & SLLIN_STPMSG_RESPONLY)) { + sl->rx_cnt = 0; + sl->tx_cnt = 0; + sl->rx_expect = 0; + sl->rx_lim = SLLIN_BUFF_LEN; + } sl->tx_buff[SLLIN_BUFF_BREAK] = 0; sl->tx_buff[SLLIN_BUFF_SYNC] = 0x55; @@ -503,19 +521,10 @@ int sllin_setup_msg(struct sllin *sl, int mode, int id, sl->tx_lim = SLLIN_BUFF_DATA; if ((data != NULL) && len) { - int i; - unsigned csum = 0; - sl->tx_lim += len; memcpy(sl->tx_buff + SLLIN_BUFF_DATA, data, len); - /* compute data parity there */ - for (i = SLLIN_BUFF_DATA; i < sl->tx_lim; i++) { - csum += sl->tx_buff[i]; - if (csum > 255) - csum -= 255; - } - - sl->tx_buff[sl->tx_lim++] = csum; + sl->tx_buff[sl->tx_lim++] = sllin_checksum(sl->tx_buff, + sl->tx_lim, mode & SLLIN_STPMSG_CHCKSUM_ENH); } if (len != 0) sl->rx_lim = SLLIN_BUFF_DATA + len + 1; @@ -558,7 +567,7 @@ int sllin_send_tx_buff(struct sllin *sl) sl->tx_cnt += res; } - printk(KERN_INFO "sllin_send_tx_buff sent %d, remains %d\n", + pr_debug("sllin: sllin_send_tx_buff sent %d, remains %d\n", sl->tx_cnt, remains); return 0; @@ -593,10 +602,12 @@ int sllin_send_break(struct sllin *sl) int sllin_send_break(struct sllin *sl) { struct tty_struct *tty = sl->tty; - unsigned long break_baud; - unsigned long flags; int retval; + unsigned long break_baud; + unsigned long usleep_range_min; + unsigned long usleep_range_max; + break_baud = ((sl->lin_baud * 2) / 3); sl->rx_cnt = SLLIN_BUFF_BREAK; sl->rx_expect = SLLIN_BUFF_BREAK + 1; sl->lin_state = SLSTATE_BREAK_SENT; @@ -608,16 +619,20 @@ int sllin_send_break(struct sllin *sl) return retval; //udelay(712); - usleep_range(650, 750); + usleep_range_min = (1000000l * SLLIN_SAMPLES_PER_CHAR) / break_baud; + usleep_range_max = usleep_range_min + 50; + usleep_range(usleep_range_min, usleep_range_max); retval = tty->ops->break_ctl(tty, 0); - usleep_range(50, 100); + usleep_range_min = (1000000l * 1 /* 1 bit */) / break_baud; + usleep_range_max = usleep_range_min + 30; + usleep_range(usleep_range_min, usleep_range_max); tty->ops->flush_buffer(tty); sl->tx_cnt = SLLIN_BUFF_SYNC; - printk(KERN_INFO "sllin: Break sent.\n"); + pr_debug("sllin: Break sent.\n"); set_bit(SLF_RXEVENT, &sl->flags); wake_up(&sl->kwt_wq); @@ -625,6 +640,48 @@ int sllin_send_break(struct sllin *sl) } #endif /* BREAK_BY_BAUD */ + +static enum hrtimer_restart sllin_rx_timeout_handler(struct hrtimer *hrtimer) +{ + struct sllin *sl = container_of(hrtimer, struct sllin, rx_timer); + + sllin_report_error(sl, SLLIN_ERR_RX_TIMEOUT); + set_bit(SLF_TMOUTEVENT, &sl->flags); + wake_up(&sl->kwt_wq); + + return HRTIMER_NORESTART; +} + +static int sllin_rx_validate(struct sllin *sl) +{ + int actual_id; + int ext_chcks_fl; + int lin_dlc; + unsigned char rec_chcksm = sl->rx_buff[sl->rx_cnt - 1]; + struct sllin_conf_entry *scf; + + actual_id = sl->rx_buff[SLLIN_BUFF_ID] & SLLIN_ID_MASK; + scf = &sl->linfr_cache[actual_id]; + lin_dlc = scf->dlc; + ext_chcks_fl = scf->frame_fl & SLLIN_CHECKSUM_EXTENDED; + + if (sllin_checksum(sl->rx_buff, sl->rx_cnt - 1, ext_chcks_fl) != + rec_chcksm) { + + /* Type of checksum is configured for particular frame */ + if (lin_dlc > 0) { + return -1; + } else { + if (sllin_checksum(sl->rx_buff, sl->rx_cnt - 1, + !ext_chcks_fl) != rec_chcksm) { + return -1; + } + } + } + + return 0; +} + /***************************************** * sllin_kwthread - kernel worker thread *****************************************/ @@ -634,16 +691,22 @@ int sllin_kwthread(void *ptr) struct sllin *sl = (struct sllin *)ptr; struct tty_struct *tty = sl->tty; struct sched_param schparam = { .sched_priority = 40 }; - int res; - struct can_frame *cf; + int tx_bytes = 0; /* Used for Network statistics */ - printk(KERN_INFO "sllin: sllin_kwthread started.\n"); + + pr_debug("sllin: sllin_kwthread started.\n"); sched_setscheduler(current, SCHED_FIFO, &schparam); clear_bit(SLF_ERROR, &sl->flags); sltty_change_speed(tty, sl->lin_baud); while (!kthread_should_stop()) { + struct can_frame *cf; + u8 *lin_data; + int lin_dlc; + u8 lin_data_buff[SLLIN_DATA_MAX]; + + if ((sl->lin_state == SLSTATE_IDLE) && sl->lin_master && sl->id_to_send) { if(sllin_send_break(sl) < 0) { @@ -654,49 +717,88 @@ int sllin_kwthread(void *ptr) wait_event_killable(sl->kwt_wq, kthread_should_stop() || test_bit(SLF_RXEVENT, &sl->flags) || test_bit(SLF_TXEVENT, &sl->flags) || - ((sl->lin_state == SLSTATE_IDLE) && test_bit(SLF_MSGEVENT, &sl->flags))); + test_bit(SLF_TMOUTEVENT, &sl->flags) || + (((sl->lin_state == SLSTATE_IDLE) || + (sl->lin_state == SLSTATE_RESPONSE_WAIT)) + && test_bit(SLF_MSGEVENT, &sl->flags))); if (test_and_clear_bit(SLF_RXEVENT, &sl->flags)) { - printk(KERN_INFO "sllin_kthread RXEVENT \n"); + pr_debug("sllin: sllin_kthread RXEVENT \n"); } if (test_and_clear_bit(SLF_TXEVENT, &sl->flags)) { - printk(KERN_INFO "sllin_kthread TXEVENT \n"); + pr_debug("sllin: sllin_kthread TXEVENT \n"); } - if ((sl->lin_state == SLSTATE_IDLE) && test_bit(SLF_MSGEVENT, &sl->flags)) { - cf = (struct can_frame *)sl->rec_skb->data; - - /* We do care only about SFF frames */ - if (cf->can_id & CAN_EFF_FLAG) - goto release_skb; + if (test_and_clear_bit(SLF_TMOUTEVENT, &sl->flags)) { + pr_debug("sllin: sllin_kthread TMOUTEVENT \n"); + sl->rx_cnt = 0; + sl->rx_expect = 0; + sl->rx_lim = sl->lin_master ? 0 : SLLIN_BUFF_LEN; + sl->tx_cnt = 0; + sl->tx_lim = 0; + sl->id_to_send = false; + sl->data_to_send = false; + + sl->lin_state = SLSTATE_IDLE; + } - if (cf->can_id & CAN_RTR_FLAG) { - printk(KERN_INFO "%s: RTR CAN frame, ID = %x\n", - __FUNCTION__, cf->can_id & CAN_SFF_MASK); - if (sllin_setup_msg(sl, 0, - cf->can_id & CAN_SFF_MASK, NULL, 0) != -1) { - sl->id_to_send = true; - sl->data_to_send = false; + switch (sl->lin_state) { + case SLSTATE_IDLE: + if (!test_bit(SLF_MSGEVENT, &sl->flags)) + break; + + cf = (struct can_frame *)sl->tx_req_skb->data; + + /* SFF RTR CAN frame -> LIN header */ + if (cf->can_id & CAN_RTR_FLAG) { + spin_lock(&sl->lock); + pr_debug("sllin: %s: RTR SFF CAN frame, ID = %x\n", + __FUNCTION__, cf->can_id & SLLIN_ID_MASK); + + /* Is there Slave response in linfr_cache to be sent? */ + if ((sl->linfr_cache[cf->can_id & SLLIN_ID_MASK].frame_fl & + SLLIN_LOC_SLAVE_CACHE) + && (sl->linfr_cache[cf->can_id & SLLIN_ID_MASK].dlc > 0)) { + + pr_debug("sllin: Sending LIN response from linfr_cache\n"); + lin_data = sl->linfr_cache[cf->can_id & SLLIN_ID_MASK].data; + lin_dlc = sl->linfr_cache[cf->can_id & SLLIN_ID_MASK].dlc; + if (lin_dlc > SLLIN_DATA_MAX) + lin_dlc = SLLIN_DATA_MAX; + memcpy(lin_data_buff, lin_data, lin_dlc); + lin_data = lin_data_buff; + } else { + lin_data = NULL; + lin_dlc = sl->linfr_cache[cf->can_id & SLLIN_ID_MASK].dlc; + } + spin_unlock(&sl->lock); + } else { /* SFF NON-RTR CAN frame -> LIN header + LIN response */ + pr_debug("sllin: %s: NON-RTR SFF CAN frame, ID = %x\n", + __FUNCTION__, (int)cf->can_id & SLLIN_ID_MASK); + + lin_data = cf->data; + lin_dlc = cf->can_dlc; + if (lin_dlc > SLLIN_DATA_MAX) + lin_dlc = SLLIN_DATA_MAX; + tx_bytes = lin_dlc; } - } else { - printk(KERN_INFO "%s: NON-RTR CAN frame, ID = %x\n", - __FUNCTION__, (int)cf->can_id & CAN_SFF_MASK); - if (sllin_setup_msg(sl, 0, cf->can_id & CAN_SFF_MASK, - cf->data, cf->can_dlc) != -1) { + if (sllin_setup_msg(sl, 0, cf->can_id & SLLIN_ID_MASK, + lin_data, lin_dlc) != -1) { + sl->id_to_send = true; - sl->data_to_send = true; + sl->data_to_send = (lin_data != NULL) ? true : false; + sl->resp_len_known = (lin_dlc > 0) ? true : false; + sl->dev->stats.tx_packets++; + sl->dev->stats.tx_bytes += tx_bytes; } - } - release_skb: - clear_bit(SLF_MSGEVENT, &sl->flags); - kfree_skb(sl->rec_skb); - netif_wake_queue(sl->dev); - } + clear_bit(SLF_MSGEVENT, &sl->flags); + kfree_skb(sl->tx_req_skb); + netif_wake_queue(sl->dev); + break; - switch (sl->lin_state) { case SLSTATE_BREAK_SENT: #ifdef BREAK_BY_BAUD if (sl->rx_cnt <= SLLIN_BUFF_BREAK) @@ -717,31 +819,84 @@ int sllin_kwthread(void *ptr) sl->rx_expect = sl->tx_lim; goto slstate_response_sent; } else { - sl->rx_expect = SLLIN_BUFF_DATA + 2; + if (sl->resp_len_known) { + sl->rx_expect = sl->rx_lim; + } else { + sl->rx_expect = SLLIN_BUFF_DATA + 2; + } sl->lin_state = SLSTATE_RESPONSE_WAIT; + /* If we don't receive anything, timer will "unblock" us */ + hrtimer_start(&sl->rx_timer, + ktime_add(ktime_get(), sl->rx_timer_timeout), + HRTIMER_MODE_ABS); goto slstate_response_wait; } break; case SLSTATE_RESPONSE_WAIT: slstate_response_wait: + if (test_bit(SLF_MSGEVENT, &sl->flags)) { + unsigned char *lin_buff; + cf = (struct can_frame *)sl->tx_req_skb->data; + + lin_buff = (sl->lin_master) ? sl->tx_buff : sl->rx_buff; + if (cf->can_id == (lin_buff[SLLIN_BUFF_ID] & SLLIN_ID_MASK)) { + if (sllin_setup_msg(sl, SLLIN_STPMSG_RESPONLY, + cf->can_id & SLLIN_ID_MASK, + cf->data, cf->can_dlc) != -1) { + + sl->rx_expect = sl->tx_lim; + sl->data_to_send = true; + sl->dev->stats.tx_packets++; + sl->dev->stats.tx_bytes += tx_bytes; + + if (!sl->lin_master) { + sl->tx_cnt = SLLIN_BUFF_DATA; + } + + sllin_send_tx_buff(sl); + clear_bit(SLF_MSGEVENT, &sl->flags); + kfree_skb(sl->tx_req_skb); + netif_wake_queue(sl->dev); + + sl->lin_state = SLSTATE_RESPONSE_SENT; + goto slstate_response_sent; + } + } else { + sl->lin_state = SLSTATE_RESPONSE_WAIT_BUS; + } + } + + case SLSTATE_RESPONSE_WAIT_BUS: if (sl->rx_cnt < sl->rx_expect) continue; - printk(KERN_INFO "sllin: response received ID %d len %d\n", + hrtimer_cancel(&sl->rx_timer); + pr_debug("sllin: response received ID %d len %d\n", sl->rx_buff[SLLIN_BUFF_ID], sl->rx_cnt - SLLIN_BUFF_DATA - 1); - // check checksum in sl->rx_buff - // send CAN non-RTR frame with data + + if (sllin_rx_validate(sl) == -1) { + pr_debug("sllin: RX validation failed.\n"); + sllin_report_error(sl, SLLIN_ERR_CHECKSUM); + //FIXME tx_stat.err++ + } else { + // send CAN non-RTR frame with data + pr_debug("sllin: sending NON-RTR CAN" + "frame with LIN payload."); + sll_bump(sl); //send packet to the network layer + } + sl->id_to_send = false; sl->lin_state = SLSTATE_IDLE; break; - + case SLSTATE_RESPONSE_SENT: slstate_response_sent: if (sl->rx_cnt < sl->tx_lim) continue; - printk(KERN_INFO "sllin: response sent ID %d len %d\n", + sll_bump(sl); //send packet to the network layer + pr_debug("sllin: response sent ID %d len %d\n", sl->rx_buff[SLLIN_BUFF_ID], sl->rx_cnt - SLLIN_BUFF_DATA - 1); sl->id_to_send = false; @@ -751,14 +906,13 @@ int sllin_kwthread(void *ptr) - /* sll_bump(sl); send packet to the network layer */ /* sl->dev->stats.tx_packets++; send frames statistic */ /* netif_wake_queue(sl->dev); allow next Tx packet arrival */ } - - printk(KERN_INFO "sllin: sllin_kwthread stopped.\n"); + hrtimer_cancel(&sl->rx_timer); + pr_debug("sllin: sllin_kwthread stopped.\n"); return 0; } @@ -829,7 +983,6 @@ static struct sllin *sll_alloc(dev_t line) } sl = netdev_priv(dev); - /* Initialize channel control data */ sl->magic = SLLIN_MAGIC; sl->dev = dev; @@ -903,6 +1056,13 @@ static int sllin_open(struct tty_struct *tty) sl->lin_state = SLSTATE_IDLE; + hrtimer_init(&sl->rx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + sl->rx_timer.function = sllin_rx_timeout_handler; + /* timeval_to_ktime(msg_head->ival1); */ + sl->rx_timer_timeout = ns_to_ktime( + (1000000000l / sl->lin_baud) * + SLLIN_SAMPLES_PER_CHAR * SLLIN_CHARS_TO_TIMEOUT); + set_bit(SLF_INUSE, &sl->flags); init_waitqueue_head(&sl->kwt_wq); @@ -1017,7 +1177,7 @@ static int __init sllin_init(void) maxdev = 4; /* Sanity */ printk(banner); - printk(KERN_INFO "sllin: %d dynamic interface channels.\n", maxdev); + pr_debug("sllin: %d dynamic interface channels.\n", maxdev); sllin_devs = kzalloc(sizeof(struct net_device *)*maxdev, GFP_KERNEL); if (!sllin_devs) { @@ -1031,6 +1191,13 @@ static int __init sllin_init(void) printk(KERN_ERR "sllin: can't register line discipline\n"); kfree(sllin_devs); } + +#ifdef BREAK_BY_BAUD + pr_debug("sllin: Break is generated by baud-rate change."); +#else + pr_debug("sllin: Break is generated manually with tiny sleep."); +#endif + return status; }