X-Git-Url: http://rtime.felk.cvut.cz/gitweb/linux-lin.git/blobdiff_plain/4cb1f9259be5ff7d43614cfa48632055b5c569f7..0bcbeebd5d817893bf301b2e3d9a4e87b86e224d:/sllin/sllin.c diff --git a/sllin/sllin.c b/sllin/sllin.c index c1cdcd1..457788c 100644 --- a/sllin/sllin.c +++ b/sllin/sllin.c @@ -62,6 +62,7 @@ #include #include #include +#include #include "linux/lin_bus.h" /* Should be in include/linux/tty.h */ @@ -113,6 +114,7 @@ enum slstate { SLSTATE_RESPONSE_WAIT_BUS, /* Wait for response from LIN bus only (CAN frames from network stack are not processed in this moment) */ + SLSTATE_ID_RECEIVED, SLSTATE_RESPONSE_SENT, }; @@ -205,22 +207,31 @@ const unsigned char sllin_id_parity_table[] = { */ static int sltty_change_speed(struct tty_struct *tty, unsigned speed) { - struct ktermios old_termios; + struct ktermios old_termios, termios; int cflag; mutex_lock(&tty->termios_mutex); - old_termios = *(tty->termios); +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0) + old_termios = termios = *(tty->termios); +#else + old_termios = termios = tty->termios; +#endif cflag = CS8 | CREAD | CLOCAL | HUPCL; cflag &= ~(CBAUD | CIBAUD); cflag |= BOTHER; - tty->termios->c_cflag = cflag; - tty->termios->c_oflag = 0; - tty->termios->c_lflag = 0; + termios.c_cflag = cflag; + termios.c_oflag = 0; + termios.c_lflag = 0; /* Enable interrupt when UART-Break or Framing error received */ - tty->termios->c_iflag = BRKINT | INPCK; + termios.c_iflag = BRKINT | INPCK; +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0) + *(tty->termios) = termios; +#else + tty->termios = termios; +#endif tty_encode_baud_rate(tty, speed, speed); @@ -494,111 +505,6 @@ static void sllin_master_receive_buf(struct tty_struct *tty, } -static void sllin_slave_receive_buf(struct tty_struct *tty, - const unsigned char *cp, char *fp, int count) -{ - struct sllin *sl = (struct sllin *) tty->disc_data; - int lin_id; - struct sllin_conf_entry *sce; - - - /* Read the characters out of the buffer */ - while (count--) { - if (fp && *fp++) { - netdev_dbg(sl->dev, "sllin_slave_receive_buf char 0x%02x ignored " - "due marker 0x%02x, flags 0x%lx\n", - *cp, *(fp-1), sl->flags); - - /* Received Break */ - sl->rx_cnt = 0; - sl->rx_expect = SLLIN_BUFF_ID + 1; - sl->rx_len_unknown = false; /* We do know exact length of the header */ - sl->header_received = false; - } - - if (sl->rx_cnt < SLLIN_BUFF_LEN) { - netdev_dbg(sl->dev, "LIN_RX[%d]: 0x%02x\n", sl->rx_cnt, *cp); - - /* We did not receive break (0x00) character */ - if ((sl->rx_cnt == SLLIN_BUFF_BREAK) && (*cp == 0x55)) { - sl->rx_buff[sl->rx_cnt++] = 0x00; - } - - if (sl->rx_cnt == SLLIN_BUFF_SYNC) { - /* 'Duplicated' break character -- ignore */ - if (*cp == 0x00) { - cp++; - continue; - } - - /* Wrong sync character */ - if (*cp != 0x55) - break; - } - - sl->rx_buff[sl->rx_cnt++] = *cp++; - } - - /* Header received */ - if ((sl->header_received == false) && (sl->rx_cnt >= (SLLIN_BUFF_ID + 1))) { - unsigned long flags; - - lin_id = sl->rx_buff[SLLIN_BUFF_ID] & LIN_ID_MASK; - sce = &sl->linfr_cache[lin_id]; - - spin_lock_irqsave(&sl->linfr_lock, flags); - - /* Is the length of data set in frame cache? */ - if (sce->frame_fl & LIN_CACHE_RESPONSE) { - sl->rx_expect += sce->dlc; - sl->rx_len_unknown = false; - } else { - sl->rx_expect += SLLIN_DATA_MAX + 1; /* + checksum */ - sl->rx_len_unknown = true; - } - spin_unlock_irqrestore(&sl->linfr_lock, flags); - - sl->header_received = true; - - sll_send_rtr(sl); - continue; - } - - /* Response received */ - if ((sl->header_received == true) && - ((sl->rx_cnt >= sl->rx_expect) || - ((sl->rx_len_unknown == true) && (count == 0)))) { - - sll_bump(sl); - netdev_dbg(sl->dev, "Received LIN header & LIN response. " - "rx_cnt = %u, rx_expect = %u\n", sl->rx_cnt, - sl->rx_expect); - - /* Prepare for reception of new header */ - sl->rx_cnt = 0; - sl->rx_expect = SLLIN_BUFF_ID + 1; - sl->rx_len_unknown = false; /* We do know exact length of the header */ - sl->header_received = false; - } - } -} - -static void sllin_receive_buf(struct tty_struct *tty, - const unsigned char *cp, char *fp, int count) -{ - struct sllin *sl = (struct sllin *) tty->disc_data; - netdev_dbg(sl->dev, "sllin_receive_buf invoked, count = %u\n", count); - - if (!sl || sl->magic != SLLIN_MAGIC || !netif_running(sl->dev)) - return; - - if (sl->lin_master) - sllin_master_receive_buf(tty, cp, fp, count); - else - sllin_slave_receive_buf(tty, cp, fp, count); - -} - /***************************************** * sllin message helper routines *****************************************/ @@ -609,7 +515,7 @@ static void sllin_receive_buf(struct tty_struct *tty, * @sl: * @err: Error flag to be sent. */ -void sllin_report_error(struct sllin *sl, int err) +static void sllin_report_error(struct sllin *sl, int err) { switch (err) { case LIN_ERR_CHECKSUM: @@ -694,7 +600,7 @@ static inline unsigned sllin_checksum(unsigned char *data, int length, int enhan #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, +static int sllin_setup_msg(struct sllin *sl, int mode, int id, unsigned char *data, int len) { if (id > LIN_ID_MASK) @@ -736,7 +642,184 @@ static void sllin_reset_buffs(struct sllin *sl) sl->data_to_send = false; } -int sllin_send_tx_buff(struct sllin *sl) +/** + * sllin_rx_validate() -- Validate received frame, i,e. check checksum + * + * @sl: + */ +static int sllin_rx_validate(struct sllin *sl) +{ + unsigned long flags; + 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 *sce; + + actual_id = sl->rx_buff[SLLIN_BUFF_ID] & LIN_ID_MASK; + sce = &sl->linfr_cache[actual_id]; + + spin_lock_irqsave(&sl->linfr_lock, flags); + lin_dlc = sce->dlc; + ext_chcks_fl = sce->frame_fl & LIN_CHECKSUM_EXTENDED; + spin_unlock_irqrestore(&sl->linfr_lock, flags); + + 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; +} + +static void sllin_slave_finish_rx_msg(struct sllin *sl) +{ + if (sllin_rx_validate(sl) == -1) { + netdev_dbg(sl->dev, "sllin: RX validation failed.\n"); + sllin_report_error(sl, LIN_ERR_CHECKSUM); + } else { + /* Send CAN non-RTR frame with data */ + netdev_dbg(sl->dev, "sllin: sending NON-RTR CAN frame with LIN payload."); + sll_bump(sl); /* send packet to the network layer */ + } + /* Prepare for reception of new header */ + sl->rx_cnt = 0; + sl->rx_expect = SLLIN_BUFF_ID + 1; + sl->rx_len_unknown = false; /* We do know exact length of the header */ + sl->header_received = false; +} + +static void sllin_slave_receive_buf(struct tty_struct *tty, + const unsigned char *cp, char *fp, int count) +{ + struct sllin *sl = (struct sllin *) tty->disc_data; + int lin_id; + struct sllin_conf_entry *sce; + + + /* Read the characters out of the buffer */ + while (count--) { + if (fp && *fp++) { + /* + * If we don't know the length of the current message + * we received the break of the next message. + * Evaluate the previous one before continuing + */ + if (sl->rx_len_unknown == true) + { + hrtimer_cancel(&sl->rx_timer); + sllin_slave_finish_rx_msg(sl); + + set_bit(SLF_RXEVENT, &sl->flags); + wake_up(&sl->kwt_wq); + } + + netdev_dbg(sl->dev, "sllin_slave_receive_buf char 0x%02x ignored " + "due marker 0x%02x, flags 0x%lx\n", + *cp, *(fp-1), sl->flags); + + /* Received Break */ + sl->rx_cnt = 0; + sl->rx_expect = SLLIN_BUFF_ID + 1; + sl->rx_len_unknown = false; /* We do know exact length of the header */ + sl->header_received = false; + } + + if (sl->rx_cnt < SLLIN_BUFF_LEN) { + netdev_dbg(sl->dev, "LIN_RX[%d]: 0x%02x\n", sl->rx_cnt, *cp); + + /* We did not receive break (0x00) character */ + if ((sl->rx_cnt == SLLIN_BUFF_BREAK) && (*cp == 0x55)) { + sl->rx_buff[sl->rx_cnt++] = 0x00; + } + + if (sl->rx_cnt == SLLIN_BUFF_SYNC) { + /* 'Duplicated' break character -- ignore */ + if (*cp == 0x00) { + cp++; + continue; + } + + /* Wrong sync character */ + if (*cp != 0x55) + break; + } + + sl->rx_buff[sl->rx_cnt++] = *cp++; + } + + /* Header received */ + if ((sl->header_received == false) && (sl->rx_cnt >= (SLLIN_BUFF_ID + 1))) { + unsigned long flags; + + lin_id = sl->rx_buff[SLLIN_BUFF_ID] & LIN_ID_MASK; + sce = &sl->linfr_cache[lin_id]; + + spin_lock_irqsave(&sl->linfr_lock, flags); + + sl->lin_state = SLSTATE_ID_RECEIVED; + /* Is the length of data set in frame cache? */ + if (sce->dlc > 0) { + sl->rx_expect += sce->dlc + 1; /* + checksum */ + sl->rx_len_unknown = false; + wake_up(&sl->kwt_wq); + } else { + sl->rx_expect += SLLIN_DATA_MAX + 1; /* + checksum */ + sl->rx_len_unknown = true; + } + spin_unlock_irqrestore(&sl->linfr_lock, flags); + + sl->header_received = true; + + hrtimer_start(&sl->rx_timer, + ktime_add(ktime_get(), sl->rx_timer_timeout), + HRTIMER_MODE_ABS); + sll_send_rtr(sl); + continue; + } + + /* Response received */ + if ((sl->header_received == true) && + ((sl->rx_cnt >= sl->rx_expect))) { + + hrtimer_cancel(&sl->rx_timer); + netdev_dbg(sl->dev, "Received LIN header & LIN response. " + "rx_cnt = %u, rx_expect = %u\n", sl->rx_cnt, + sl->rx_expect); + sllin_slave_finish_rx_msg(sl); + + set_bit(SLF_RXEVENT, &sl->flags); + wake_up(&sl->kwt_wq); + } + } +} + +static void sllin_receive_buf(struct tty_struct *tty, + const unsigned char *cp, char *fp, int count) +{ + struct sllin *sl = (struct sllin *) tty->disc_data; + netdev_dbg(sl->dev, "sllin_receive_buf invoked, count = %u\n", count); + + if (!sl || sl->magic != SLLIN_MAGIC || !netif_running(sl->dev)) + return; + + if (sl->lin_master) + sllin_master_receive_buf(tty, cp, fp, count); + else + sllin_slave_receive_buf(tty, cp, fp, count); + +} + +static int sllin_send_tx_buff(struct sllin *sl) { struct tty_struct *tty = sl->tty; int remains; @@ -795,7 +878,7 @@ error_in_write: } #ifdef BREAK_BY_BAUD -int sllin_send_break(struct sllin *sl) +static int sllin_send_break(struct sllin *sl) { struct tty_struct *tty = sl->tty; unsigned long break_baud; @@ -820,7 +903,7 @@ int sllin_send_break(struct sllin *sl) } #else /* BREAK_BY_BAUD */ -int sllin_send_break(struct sllin *sl) +static int sllin_send_break(struct sllin *sl) { struct tty_struct *tty = sl->tty; int retval; @@ -866,63 +949,31 @@ 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, LIN_ERR_RX_TIMEOUT); - set_bit(SLF_TMOUTEVENT, &sl->flags); + if (sl->lin_master) { + sllin_report_error(sl, LIN_ERR_RX_TIMEOUT); + set_bit(SLF_TMOUTEVENT, &sl->flags); + } else { + sllin_slave_finish_rx_msg(sl); + set_bit(SLF_RXEVENT, &sl->flags); + } wake_up(&sl->kwt_wq); return HRTIMER_NORESTART; } -/** - * sllin_rx_validate() -- Validate received frame, i,e. check checksum - * - * @sl: - */ -static int sllin_rx_validate(struct sllin *sl) -{ - unsigned long flags; - 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 *sce; - - actual_id = sl->rx_buff[SLLIN_BUFF_ID] & LIN_ID_MASK; - sce = &sl->linfr_cache[actual_id]; - - spin_lock_irqsave(&sl->linfr_lock, flags); - lin_dlc = sce->dlc; - ext_chcks_fl = sce->frame_fl & LIN_CHECKSUM_EXTENDED; - spin_unlock_irqrestore(&sl->linfr_lock, flags); - - 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 *****************************************/ -int sllin_kwthread(void *ptr) +static 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 tx_bytes = 0; /* Used for Network statistics */ - + unsigned long flags; + int lin_id; + struct sllin_conf_entry *sce; netdev_dbg(sl->dev, "sllin_kwthread started.\n"); sched_setscheduler(current, SCHED_FIFO, &schparam); @@ -949,6 +1000,7 @@ int sllin_kwthread(void *ptr) test_bit(SLF_TXEVENT, &sl->flags) || test_bit(SLF_TMOUTEVENT, &sl->flags) || test_bit(SLF_ERROR, &sl->flags) || + (sl->lin_state == SLSTATE_ID_RECEIVED) || (((sl->lin_state == SLSTATE_IDLE) || (sl->lin_state == SLSTATE_RESPONSE_WAIT)) && test_bit(SLF_MSGEVENT, &sl->flags))); @@ -994,7 +1046,6 @@ int sllin_kwthread(void *ptr) /* SFF RTR CAN frame -> LIN header */ if (cf->can_id & CAN_RTR_FLAG) { - unsigned long flags; struct sllin_conf_entry *sce; netdev_dbg(sl->dev, "%s: RTR SFF CAN frame, ID = %x\n", @@ -1143,6 +1194,54 @@ slstate_response_wait: sl->lin_state = SLSTATE_IDLE; break; + case SLSTATE_ID_RECEIVED: + lin_id = sl->rx_buff[SLLIN_BUFF_ID] & LIN_ID_MASK; + sce = &sl->linfr_cache[lin_id]; + spin_lock_irqsave(&sl->linfr_lock, flags); + + if ((sce->frame_fl & LIN_CACHE_RESPONSE) + && (sce->dlc > 0)) { + int mode; + + netdev_dbg(sl->dev, "Sending LIN response from linfr_cache\n"); + + lin_data = sce->data; + lin_dlc = sce->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; + tx_bytes = lin_dlc; + + mode = SLLIN_STPMSG_RESPONLY; + if (sce->frame_fl & LIN_CHECKSUM_EXTENDED) + mode |= SLLIN_STPMSG_CHCKSUM_ENH; + + if (sllin_setup_msg(sl, mode, lin_id & LIN_ID_MASK, + lin_data, lin_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; + sl->resp_len_known = true; + + if (!sl->lin_master) { + sl->tx_cnt = SLLIN_BUFF_DATA; + } + sllin_send_tx_buff(sl); + } + + kfree_skb(sl->tx_req_skb); + netif_wake_queue(sl->dev); + hrtimer_start(&sl->rx_timer, + ktime_add(ktime_get(), sl->rx_timer_timeout), + HRTIMER_MODE_ABS); + } + spin_unlock_irqrestore(&sl->linfr_lock, flags); + sl->lin_state = SLSTATE_IDLE; + break; + case SLSTATE_RESPONSE_SENT: slstate_response_sent: if (sl->rx_cnt < sl->tx_lim)