X-Git-Url: http://rtime.felk.cvut.cz/gitweb/linux-lin.git/blobdiff_plain/7f0102aa259dec7f56c0a36ac52a90eec60f7400..49dbbd416332c2d82f361d9197332c6f76d8b55b:/sllin/sllin.c diff --git a/sllin/sllin.c b/sllin/sllin.c index cf387e7..ab4a1cc 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 @@ -35,14 +32,21 @@ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * - * Send feedback to - * + * Idea: Oliver Hartkopp + * Copyright: (c) 2011 Czech Technical University in Prague + * (c) 2011 Volkswagen Group Research + * Authors: Pavel Pisa + * Rostislav Lisovy + * Michal Sojka + * Funded by: Volkswagen Group Research */ +//#define DEBUG 1 /* Enables pr_debug() printouts */ +//#define SLLIN_LED_TRIGGER /* Enables led triggers */ + #include #include -#include #include #include #include @@ -58,9 +62,30 @@ #include #include #include +#include +#include +#include "linux/lin_bus.h" /* Should be in include/linux/tty.h */ -#define N_SLLIN 25 +#define N_SLLIN 25 +/* -------------------------------- */ + +#ifdef SLLIN_LED_TRIGGER +#define SLLIN_LED_NAME_SZ (IFNAMSIZ + 6) +#include + +enum sllin_led_event { + SLLIN_LED_EVENT_OPEN, + SLLIN_LED_EVENT_STOP, + SLLIN_LED_EVENT_TX, + SLLIN_LED_EVENT_RX +}; + +static unsigned long led_delay = 50; +module_param(led_delay, ulong, 0644); +MODULE_PARM_DESC(led_delay, + "blink delay time for activity leds (msecs, default: 50)."); +#endif /* SLLIN_LED_TRIGGER */ static __initdata const char banner[] = KERN_INFO "sllin: serial line LIN interface driver\n"; @@ -68,33 +93,56 @@ 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("Pavel Pisa "); -#define SLLIN_MAGIC 0x53CA +#define SLLIN_MAGIC 0x53CA +/* #define BREAK_BY_BAUD */ + +static bool master = true; +static int baudrate; /* Use LIN_DEFAULT_BAUDRATE when not set */ + +module_param(master, bool, 0444); +MODULE_PARM_DESC(master, "LIN interface is Master device"); +module_param(baudrate, int, 0444); +MODULE_PARM_DESC(baudrate, "Baudrate of LIN interface"); static int maxdev = 10; /* MAX number of SLLIN channels; This can be overridden with insmod sllin.ko maxdev=nnn */ -module_param(maxdev, int, 0); +module_param(maxdev, int, 0444); MODULE_PARM_DESC(maxdev, "Maximum number of sllin interfaces"); /* maximum buffer len to store whole LIN message*/ -#define SLLIN_DATA_MAX 8 -#define SLLIN_BUFF_LEN (1 /*break*/ + 1 /*sync*/ + 1 /*ID*/ + \ - SLLIN_DATA_MAX + 1 /*checksum*/) -#define SLLIN_BUFF_BREAK 0 -#define SLLIN_BUFF_SYNC 1 -#define SLLIN_BUFF_ID 2 -#define SLLIN_BUFF_DATA 3 +#define SLLIN_DATA_MAX 8 +#define SLLIN_BUFF_LEN (1 /*break*/ + 1 /*sync*/ + 1 /*ID*/ + \ + SLLIN_DATA_MAX + 1 /*checksum*/) +#define SLLIN_BUFF_BREAK 0 +#define SLLIN_BUFF_SYNC 1 +#define SLLIN_BUFF_ID 2 +#define SLLIN_BUFF_DATA 3 + +#define SLLIN_SAMPLES_PER_CHAR 10 +#define SLLIN_CHARS_TO_TIMEOUT 24 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_ID_RECEIVED, SLSTATE_RESPONSE_SENT, }; +struct sllin_conf_entry { + int dlc; /* Length of data in LIN frame */ + 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; @@ -107,14 +155,20 @@ struct sllin { unsigned char rx_buff[SLLIN_BUFF_LEN]; /* LIN Rx buffer */ unsigned char tx_buff[SLLIN_BUFF_LEN]; /* LIN Tx buffer */ int rx_expect; /* expected number of Rx chars */ - int rx_lim; /* maximum Rx chars for ID */ + int rx_lim; /* maximum Rx chars for current frame */ int rx_cnt; /* message buffer Rx fill level */ int tx_lim; /* actual limit of bytes to Tx */ int tx_cnt; /* number of already Tx bytes */ char lin_master; /* node is a master node */ int lin_baud; /* LIN baudrate */ - int lin_state; /* state */ - int id_to_sent; /* there is ID to be sent */ + 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 */ + char header_received;/* In Slave mode, set when header was already + received */ + char rx_len_unknown; /* We are not sure how much data will be sent to us -- + we just guess the length */ unsigned long flags; /* Flag values/ mode etc */ #define SLF_INUSE 0 /* Channel in use */ @@ -122,161 +176,276 @@ 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 */ +#define SLF_TXBUFF_RQ 6 /* Req. to send buffer to UART*/ +#define SLF_TXBUFF_INPR 7 /* Above request in progress */ - unsigned char leased; dev_t line; struct task_struct *kwthread; - wait_queue_head_t kwt_wq; + wait_queue_head_t kwt_wq; /* Wait queue used by kwthread */ + 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*/ + + /* List with configurations for each of 0 to LIN_ID_MAX LIN IDs */ + struct sllin_conf_entry linfr_cache[LIN_ID_MAX + 1]; + spinlock_t linfr_lock; /* frame cache and buffers lock */ + +#ifdef SLLIN_LED_TRIGGER + struct led_trigger *tx_led_trig; + char tx_led_trig_name[SLLIN_LED_NAME_SZ]; + struct led_trigger *rx_led_trig; + char rx_led_trig_name[SLLIN_LED_NAME_SZ]; + struct led_trigger *rxtx_led_trig; + char rxtx_led_trig_name[SLLIN_LED_NAME_SZ]; +#endif }; static struct net_device **sllin_devs; +static int sllin_configure_frame_cache(struct sllin *sl, struct can_frame *cf); +static void sllin_slave_receive_buf(struct tty_struct *tty, + const unsigned char *cp, char *fp, int count); +static void sllin_master_receive_buf(struct tty_struct *tty, + const unsigned char *cp, char *fp, int count); + +/* Values of two parity bits in LIN Protected + Identifier for each particular LIN ID */ const unsigned char sllin_id_parity_table[] = { - 0x80,0xc0,0x40,0x00,0xc0,0x80,0x00,0x40, - 0x00,0x40,0xc0,0x80,0x40,0x00,0x80,0xc0, - 0x40,0x00,0x80,0xc0,0x00,0x40,0xc0,0x80, - 0xc0,0x80,0x00,0x40,0x80,0xc0,0x40,0x00, - 0x00,0x40,0xc0,0x80,0x40,0x00,0x80,0xc0, - 0x80,0xc0,0x40,0x00,0xc0,0x80,0x00,0x40, - 0xc0,0x80,0x00,0x40,0x80,0xc0,0x40,0x00, - 0x40,0x00,0x80,0xc0,0x00,0x40,0xc0,0x80 + 0x80, 0xc0, 0x40, 0x00, 0xc0, 0x80, 0x00, 0x40, + 0x00, 0x40, 0xc0, 0x80, 0x40, 0x00, 0x80, 0xc0, + 0x40, 0x00, 0x80, 0xc0, 0x00, 0x40, 0xc0, 0x80, + 0xc0, 0x80, 0x00, 0x40, 0x80, 0xc0, 0x40, 0x00, + 0x00, 0x40, 0xc0, 0x80, 0x40, 0x00, 0x80, 0xc0, + 0x80, 0xc0, 0x40, 0x00, 0xc0, 0x80, 0x00, 0x40, + 0xc0, 0x80, 0x00, 0x40, 0x80, 0xc0, 0x40, 0x00, + 0x40, 0x00, 0x80, 0xc0, 0x00, 0x40, 0xc0, 0x80 +}; + +#ifdef SLLIN_LED_TRIGGER +static void sllin_led_event(struct net_device *netdev, enum sllin_led_event event) +{ + struct sllin *sl = netdev_priv(netdev); + + switch (event) { + case SLLIN_LED_EVENT_OPEN: + led_trigger_event(sl->tx_led_trig, LED_FULL); + led_trigger_event(sl->rx_led_trig, LED_FULL); + led_trigger_event(sl->rxtx_led_trig, LED_FULL); + break; + case SLLIN_LED_EVENT_STOP: + led_trigger_event(sl->tx_led_trig, LED_OFF); + led_trigger_event(sl->rx_led_trig, LED_OFF); + led_trigger_event(sl->rxtx_led_trig, LED_OFF); + break; + case SLLIN_LED_EVENT_TX: + if (led_delay) { + led_trigger_blink_oneshot(sl->tx_led_trig, + &led_delay, &led_delay, 1); + led_trigger_blink_oneshot(sl->rxtx_led_trig, + &led_delay, &led_delay, 1); + } + break; + case SLLIN_LED_EVENT_RX: + if (led_delay) { + led_trigger_blink_oneshot(sl->rx_led_trig, + &led_delay, &led_delay, 1); + led_trigger_blink_oneshot(sl->rxtx_led_trig, + &led_delay, &led_delay, 1); + } + break; + } +} + +static void sllin_led_release(struct device *gendev, void *res) +{ + struct sllin *sl = netdev_priv(to_net_dev(gendev)); + + led_trigger_unregister_simple(sl->tx_led_trig); + led_trigger_unregister_simple(sl->rx_led_trig); + led_trigger_unregister_simple(sl->rxtx_led_trig); +} + +static void devm_sllin_led_init(struct net_device *netdev) +{ + struct sllin *sl = netdev_priv(netdev); + void *res; + + res = devres_alloc(sllin_led_release, 0, GFP_KERNEL); + if (!res) { + netdev_err(netdev, "cannot register LED triggers\n"); + return; + } + + snprintf(sl->tx_led_trig_name, sizeof(sl->tx_led_trig_name), + "%s-tx", netdev->name); + snprintf(sl->rx_led_trig_name, sizeof(sl->rx_led_trig_name), + "%s-rx", netdev->name); + snprintf(sl->rxtx_led_trig_name, sizeof(sl->rxtx_led_trig_name), + "%s-rxtx", netdev->name); + + led_trigger_register_simple(sl->tx_led_trig_name, + &sl->tx_led_trig); + led_trigger_register_simple(sl->rx_led_trig_name, + &sl->rx_led_trig); + led_trigger_register_simple(sl->rxtx_led_trig_name, + &sl->rxtx_led_trig); + + devres_add(&netdev->dev, res); +} + +static struct sllin *netdev_priv_safe(struct net_device *dev) +{ + int i; + + if (sllin_devs == NULL) + return NULL; + + for (i = 0; i < maxdev; ++i) + if (sllin_devs[i] == dev) + return netdev_priv(dev); + + return NULL; +} + +static int sllin_netdev_notifier_call(struct notifier_block *nb, unsigned long msg, + void *ptr) +{ + struct net_device *netdev = netdev_notifier_info_to_dev(ptr); + struct sllin *sl = netdev_priv_safe(netdev); + char name[SLLIN_LED_NAME_SZ]; + + if (!sl) + return NOTIFY_DONE; + + if (!sl->tx_led_trig || !sl->rx_led_trig || !sl->rxtx_led_trig) + return NOTIFY_DONE; + + if (msg == NETDEV_CHANGENAME) { + snprintf(name, sizeof(name), "%s-tx", netdev->name); + led_trigger_rename_static(name, sl->tx_led_trig); + + snprintf(name, sizeof(name), "%s-rx", netdev->name); + led_trigger_rename_static(name, sl->rx_led_trig); + + snprintf(name, sizeof(name), "%s-rxtx", netdev->name); + led_trigger_rename_static(name, sl->rxtx_led_trig); + } + + return NOTIFY_DONE; +} + +static struct notifier_block sllin_netdev_notifier __read_mostly = { + .notifier_call = sllin_netdev_notifier_call, }; +#endif /* SLLIN_LED_TRIGGER */ +/** + * sltty_change_speed() -- Change baudrate of Serial device belonging + * to particular @tty + * + * @tty: Pointer to TTY to change speed for. + * @speed: Integer value of new speed. It is possible to + * assign non-standard values, i.e. those which + * are not defined in termbits.h. + */ static int sltty_change_speed(struct tty_struct *tty, unsigned speed) { - struct ktermios old_termios; + struct ktermios old_termios, termios; int cflag; +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0) mutex_lock(&tty->termios_mutex); - old_termios = *(tty->termios); - cflag = tty->termios->c_cflag; +#else + down_write(&tty->termios_rwsem); +#endif + +#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; + termios.c_cflag = cflag; + termios.c_oflag = 0; + termios.c_lflag = 0; + + /* Enable interrupt when UART-Break or Framing error received */ + 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); + if (tty->ops->set_termios) tty->ops->set_termios(tty, &old_termios); - //priv->io.speed = speed; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0) mutex_unlock(&tty->termios_mutex); +#else + up_write(&tty->termios_rwsem); +#endif return 0; } - -/* 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; -} - - - /************************************************************************ - * STANDARD SLLIN ENCAPSULATION * - ************************************************************************/ - -/* Convert particular CAN frame into LIN frame and send it to TTY queue. */ -static void sll_encaps(struct sllin *sl, struct can_frame *cf) -{ - int actual, idx, i; - char lframe[16] = {0x00, 0x55}; /* Fake break, Sync byte */ - struct tty_struct *tty = sl->tty; + struct sk_buff *skb; + struct can_frame cf; - pr_debug("sllin: %s() invoked\n", __FUNCTION__); + cf.can_id = id; + cf.can_dlc = len; + if (cf.can_dlc > 0) + memcpy(&cf.data, data, cf.can_dlc); - /* We do care only about SFF frames */ - if (cf->can_id & CAN_EFF_FLAG) + skb = dev_alloc_skb(sizeof(struct can_frame)); + if (!skb) 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 */ + 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); - sltty_change_speed(tty, sl->lin_baud / 2); - 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; - */ - } + sl->dev->stats.rx_packets++; + sl->dev->stats.rx_bytes += cf.can_dlc; + +#ifdef SLLIN_LED_TRIGGER + sllin_led_event(sl->dev, SLLIN_LED_EVENT_RX); +#endif +} + +/** + * sll_bump() -- Send data of received LIN frame (existing in sl->rx_buff) + * as CAN frame + * + * @sl: + */ +static void sll_bump(struct sllin *sl) +{ + int len = sl->rx_cnt - SLLIN_BUFF_DATA - 1; /* without checksum */ + len = (len < 0) ? 0 : len; + sllin_send_canfr(sl, sl->rx_buff[SLLIN_BUFF_ID] & LIN_ID_MASK, + sl->rx_buff + SLLIN_BUFF_DATA, len); +} + +static void sll_send_rtr(struct sllin *sl) +{ + sllin_send_canfr(sl, (sl->rx_buff[SLLIN_BUFF_ID] & LIN_ID_MASK) | + CAN_RTR_FLAG, NULL, 0); } /* @@ -285,7 +454,7 @@ static void sll_encaps(struct sllin *sl, struct can_frame *cf) */ static void sllin_write_wakeup(struct tty_struct *tty) { - int actual; + int actual = 0; int remains; struct sllin *sl = (struct sllin *) tty->disc_data; @@ -293,49 +462,94 @@ static void sllin_write_wakeup(struct tty_struct *tty) if (!sl || sl->magic != SLLIN_MAGIC || !netif_running(sl->dev)) return; - if (sl->lin_state != SLSTATE_BREAK_SENT) - remains = sl->tx_lim - sl->tx_cnt; - else - remains = SLLIN_BUFF_BREAK + 1 - sl->tx_cnt; - - if (remains > 0) { - actual = tty->ops->write(tty, sl->tx_buff + sl->tx_cnt, sl->tx_cnt - sl->tx_lim); - sl->tx_cnt += actual; - - if(sl->tx_cnt < sl->tx_lim) - return; + set_bit(SLF_TXBUFF_RQ, &sl->flags); + do { + if (unlikely(test_and_set_bit(SLF_TXBUFF_INPR, &sl->flags))) + return; /* ongoing concurrent processing */ + + clear_bit(SLF_TXBUFF_RQ, &sl->flags); + +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) + smp_mb__after_clear_bit(); +#else + smp_mb__after_atomic(); +#endif + + if (sl->lin_state != SLSTATE_BREAK_SENT) + remains = sl->tx_lim - sl->tx_cnt; + else + remains = SLLIN_BUFF_BREAK + 1 - sl->tx_cnt; + + if (remains > 0) { + actual = tty->ops->write(tty, sl->tx_buff + sl->tx_cnt, + sl->tx_cnt - sl->tx_lim); + sl->tx_cnt += actual; + remains -= actual; + } + clear_bit(SLF_TXBUFF_INPR, &sl->flags); +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) + smp_mb__after_clear_bit(); +#else + smp_mb__after_atomic(); +#endif + + } while (unlikely(test_bit(SLF_TXBUFF_RQ, &sl->flags))); + + if ((remains > 0) && (actual >= 0)) { + netdev_dbg(sl->dev, "sllin_write_wakeup sent %d, remains %d, waiting\n", + sl->tx_cnt, sl->tx_lim - sl->tx_cnt); + return; } clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); set_bit(SLF_TXEVENT, &sl->flags); wake_up(&sl->kwt_wq); + netdev_dbg(sl->dev, "sllin_write_wakeup sent %d, wakeup\n", sl->tx_cnt); } -/* Send a can_frame to a TTY queue. */ +/** + * sll_xmit() -- Send a can_frame to a TTY queue. + * + * @skb: Pointer to Socket buffer to be sent. + * @dev: Network device where @skb will be sent. + */ 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 out; + 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 out; + netdev_warn(sl->dev, "xmit: iface is down\n"); + goto err_out_unlock; } if (sl->tty == NULL) { - spin_unlock(&sl->lock); - goto out; + netdev_warn(sl->dev, "xmit: no tty device connected\n"); + goto err_out_unlock; + } + + cf = (struct can_frame *) skb->data; + if (cf->can_id & LIN_CTRL_FRAME) { + sllin_configure_frame_cache(sl, cf); + goto free_out_unlock; } netif_stop_queue(sl->dev); - sll_encaps(sl, (struct can_frame *) skb->data); /* encaps & send */ + + sl->tx_req_skb = skb; + set_bit(SLF_MSGEVENT, &sl->flags); + wake_up(&sl->kwt_wq); spin_unlock(&sl->lock); + return NETDEV_TX_OK; -out: +free_out_unlock: +err_out_unlock: + spin_unlock(&sl->lock); +err_out: kfree_skb(skb); return NETDEV_TX_OK; } @@ -360,6 +574,9 @@ static int sll_close(struct net_device *dev) sl->tx_lim = 0; spin_unlock_bh(&sl->lock); +#ifdef SLLIN_LED_TRIGGER + sllin_led_event(dev, SLLIN_LED_EVENT_STOP); +#endif return 0; } @@ -368,13 +585,17 @@ static int sll_open(struct net_device *dev) { struct sllin *sl = netdev_priv(dev); - pr_debug("sllin: %s() invoked\n", __FUNCTION__); + netdev_dbg(sl->dev, "%s() invoked\n", __func__); if (sl->tty == NULL) return -ENODEV; sl->flags &= (1 << SLF_INUSE); netif_start_queue(dev); + +#ifdef SLLIN_LED_TRIGGER + sllin_led_event(dev, SLLIN_LED_EVENT_OPEN); +#endif return 0; } @@ -406,63 +627,169 @@ static void sll_setup(struct net_device *dev) /* New-style flags. */ dev->flags = IFF_NOARP; - dev->features = NETIF_F_NO_CSUM; + dev->features = NETIF_F_HW_CSUM; /* NETIF_F_NO_CSUM;*/ } /****************************************** Routines looking at TTY side. ******************************************/ - -/* - * Handle the 'receiver data ready' interrupt. - * This function is called by the 'tty_io' module in the kernel when - * a block of SLLIN data has been received, which can now be decapsulated - * and sent on to some IP layer for further processing. This will not - * be re-entered while running but other ldisc functions may be called - * in parallel - */ - -static void sllin_receive_buf(struct tty_struct *tty, +static void sllin_master_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count) { struct sllin *sl = (struct sllin *) tty->disc_data; - if (!sl || sl->magic != SLLIN_MAGIC || !netif_running(sl->dev)) - return; - /* Read the characters out of the buffer */ while (count--) { if (fp && *fp++) { - if (!test_and_set_bit(SLF_ERROR, &sl->flags)) - sl->dev->stats.rx_errors++; - cp++; - continue; + netdev_dbg(sl->dev, "sllin_master_receive_buf char 0x%02x ignored " + "due marker 0x%02x, flags 0x%lx\n", + *cp, *(fp-1), sl->flags); + + /* i.e. Real error -- not Break */ + if (sl->rx_cnt > SLLIN_BUFF_BREAK) { + set_bit(SLF_ERROR, &sl->flags); + wake_up(&sl->kwt_wq); + return; + } } - if (sl->rx_cnt < SLLIN_BUFF_LEN) { +#ifndef BREAK_BY_BAUD + /* We didn't receive Break character -- fake it! */ + if ((sl->rx_cnt == SLLIN_BUFF_BREAK) && (*cp == 0x55)) { + netdev_dbg(sl->dev, "LIN_RX[%d]: 0x00\n", sl->rx_cnt); + sl->rx_buff[sl->rx_cnt++] = 0x00; + } +#endif /* BREAK_BY_BAUD */ + + if (sl->rx_cnt < SLLIN_BUFF_LEN) { + netdev_dbg(sl->dev, "LIN_RX[%d]: 0x%02x\n", sl->rx_cnt, *cp); sl->rx_buff[sl->rx_cnt++] = *cp++; } } - if(sl->rx_cnt >= sl->rx_expect) { + + if (sl->rx_cnt >= sl->rx_expect) { set_bit(SLF_RXEVENT, &sl->flags); wake_up(&sl->kwt_wq); + netdev_dbg(sl->dev, "sllin_receive_buf count %d, wakeup\n", sl->rx_cnt); + } else { + netdev_dbg(sl->dev, "sllin_receive_buf count %d, waiting\n", sl->rx_cnt); } } + /***************************************** * sllin message helper routines *****************************************/ +/** + * sllin_report_error() -- Report an error by sending CAN frame + * with particular error flag set in can_id + * + * @sl: + * @err: Error flag to be sent. + */ +static void sllin_report_error(struct sllin *sl, int err) +{ + unsigned char *lin_buff; + int lin_id; + + switch (err) { + case LIN_ERR_CHECKSUM: + sl->dev->stats.rx_crc_errors++; + break; + + case LIN_ERR_RX_TIMEOUT: + sl->dev->stats.rx_errors++; + break; + + case LIN_ERR_FRAMING: + sl->dev->stats.rx_frame_errors++; + break; + } + + lin_buff = (sl->lin_master) ? sl->tx_buff : sl->rx_buff; + lin_id = lin_buff[SLLIN_BUFF_ID] & LIN_ID_MASK; + sllin_send_canfr(sl, lin_id | CAN_EFF_FLAG | + (err & ~LIN_ID_MASK), NULL, 0); +} + +/** + * sllin_configure_frame_cache() -- Configure particular entry in linfr_cache + * + * @sl: + * @cf: Pointer to CAN frame sent to this driver + * holding configuration information + */ +static int sllin_configure_frame_cache(struct sllin *sl, struct can_frame *cf) +{ + unsigned long flags; + struct sllin_conf_entry *sce; + + if (!(cf->can_id & LIN_CTRL_FRAME)) + return -1; + + sce = &sl->linfr_cache[cf->can_id & LIN_ID_MASK]; + netdev_dbg(sl->dev, "Setting frame cache with EFF CAN frame. LIN ID = %d\n", + cf->can_id & LIN_ID_MASK); + + spin_lock_irqsave(&sl->linfr_lock, flags); + + sce->dlc = cf->can_dlc; + if (sce->dlc > SLLIN_DATA_MAX) + sce->dlc = SLLIN_DATA_MAX; + + sce->frame_fl = (cf->can_id & ~LIN_ID_MASK) & CAN_EFF_MASK; + memcpy(sce->data, cf->data, cf->can_dlc); + + spin_unlock_irqrestore(&sl->linfr_lock, flags); -int sllin_setup_msg(struct sllin *sl, int mode, int id, + return 0; +} + +/** + * sllin_checksum() -- Count checksum for particular data + * + * @data: Pointer to the buffer containing whole LIN + * frame (i.e. including break and sync bytes). + * @length: Length of the buffer. + * @enhanced_fl: Flag determining whether Enhanced or Classic + * checksum should be counted. + */ +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) + +static int sllin_setup_msg(struct sllin *sl, int mode, int id, unsigned char *data, int len) { - if (id > 0x3f) + if (id > LIN_ID_MASK) return -1; - sl->rx_cnt = 0; - sl->tx_cnt = 0; - sl->rx_expect = 0; + 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; @@ -472,57 +799,290 @@ int sllin_setup_msg(struct sllin *sl, int mode, int id, if ((data != NULL) && len) { sl->tx_lim += len; memcpy(sl->tx_buff + SLLIN_BUFF_DATA, data, len); + sl->tx_buff[sl->tx_lim] = sllin_checksum(sl->tx_buff, + sl->tx_lim, mode & SLLIN_STPMSG_CHCKSUM_ENH); + sl->tx_lim++; } - sl->rx_lim += len; + if (len != 0) + sl->rx_lim = SLLIN_BUFF_DATA + len + 1; return 0; } +static void sllin_reset_buffs(struct sllin *sl) +{ + 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; +} -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 + * and received at least the LIN ID, we received here + * the break of the next message. + * Evaluate the previous one before continuing. + */ + if ((sl->rx_len_unknown == true) && + (sl->rx_cnt >= SLLIN_BUFF_ID)) + { + 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; int res; - if (sl->lin_state != SLSTATE_BREAK_SENT) + set_bit(SLF_TXBUFF_RQ, &sl->flags); + do { + if (unlikely(test_and_set_bit(SLF_TXBUFF_INPR, &sl->flags))) + return 0; /* ongoing concurrent processing */ + + clear_bit(SLF_TXBUFF_RQ, &sl->flags); +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) + smp_mb__after_clear_bit(); +#else + smp_mb__after_atomic(); +#endif + +#ifdef BREAK_BY_BAUD + if (sl->lin_state != SLSTATE_BREAK_SENT) + remains = sl->tx_lim - sl->tx_cnt; + else + remains = 1; +#else remains = sl->tx_lim - sl->tx_cnt; - else - remains = 1; +#endif + res = tty->ops->write(tty, sl->tx_buff + sl->tx_cnt, remains); + if (res < 0) + goto error_in_write; + + remains -= res; + sl->tx_cnt += res; + + if (remains > 0) { + set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); + res = tty->ops->write(tty, sl->tx_buff + sl->tx_cnt, remains); + if (res < 0) { + clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); + goto error_in_write; + } - res = tty->ops->write(tty, sl->tx_buff + sl->tx_cnt, remains); - if (res < 0) - return -1; + remains -= res; + sl->tx_cnt += res; + } - remains -= res; - sl->tx_cnt += res; + netdev_dbg(sl->dev, "sllin_send_tx_buff sent %d, remains %d\n", + sl->tx_cnt, remains); - if (remains > 0) { - set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); - res = tty->ops->write(tty, sl->tx_buff + sl->tx_cnt, remains); - if (res < 0) { - clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); - return -1; - } - } - sl->tx_cnt += res; + clear_bit(SLF_TXBUFF_INPR, &sl->flags); +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) + smp_mb__after_clear_bit(); +#else + smp_mb__after_atomic(); +#endif + + } while (unlikely(test_bit(SLF_TXBUFF_RQ, &sl->flags))); + +#ifdef SLLIN_LED_TRIGGER + sllin_led_event(sl->dev, SLLIN_LED_EVENT_TX); +#endif return 0; + +error_in_write: + clear_bit(SLF_TXBUFF_INPR, &sl->flags); + return -1; + } -int sllin_send_break(struct sllin *sl) +#ifdef BREAK_BY_BAUD +static int sllin_send_break(struct sllin *sl) { struct tty_struct *tty = sl->tty; - unsigned long break_baud = sl->lin_baud; + unsigned long break_baud; int res; - break_baud = (break_baud * 8) / 14; - + break_baud = ((sl->lin_baud * 2) / 3); sltty_change_speed(tty, break_baud); - sl->rx_expect = SLLIN_BUFF_BREAK + 1; + tty->ops->flush_buffer(tty); + sl->rx_cnt = SLLIN_BUFF_BREAK; + sl->rx_expect = SLLIN_BUFF_BREAK + 1; sl->lin_state = SLSTATE_BREAK_SENT; res = sllin_send_tx_buff(sl); @@ -533,71 +1093,390 @@ int sllin_send_break(struct sllin *sl) return 0; } +#else /* BREAK_BY_BAUD */ + +static int sllin_send_break(struct sllin *sl) +{ + struct tty_struct *tty = sl->tty; + 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; + + /* Do the break ourselves; Inspired by + http://lxr.linux.no/#linux+v3.1.2/drivers/tty/tty_io.c#L2452 */ + retval = tty->ops->break_ctl(tty, -1); + if (retval) + return retval; + + /* udelay(712); */ + 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_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; + + netdev_dbg(sl->dev, "Break sent.\n"); + set_bit(SLF_RXEVENT, &sl->flags); + wake_up(&sl->kwt_wq); + + return 0; +} +#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); + + /* + * Signal timeout when: + * master: We did not receive as much characters as expected + * slave: * we did not receive any data bytes at all + * * we know the length and didn't receive enough + */ + if ((sl->lin_master) || + (sl->rx_cnt <= SLLIN_BUFF_DATA) || + ((!sl->rx_len_unknown) && + (sl->rx_cnt < sl->rx_expect))) { + 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_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; - int res; + struct sched_param schparam = { .sched_priority = 40 }; + int tx_bytes = 0; /* Used for Network statistics */ + unsigned long flags; + int mode; + int lin_id; + struct sllin_conf_entry *sce; - printk(KERN_INFO "sllin: sllin_kwthread started.\n"); + netdev_dbg(sl->dev, "sllin_kwthread started.\n"); + sched_setscheduler(current, SCHED_FIFO, &schparam); clear_bit(SLF_ERROR, &sl->flags); - sltty_change_speed(tty, sl->lin_baud); - sllin_setup_msg(sl, 0, 0x33, NULL, 0); - 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_sent) { - if(sllin_send_break(sl)<0) { + sl->id_to_send) { + if (sllin_send_break(sl) < 0) { /* error processing */ } - } wait_event_killable(sl->kwt_wq, kthread_should_stop() || test_bit(SLF_RXEVENT, &sl->flags) || - test_bit(SLF_TXEVENT, &sl->flags)); + 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))); if (test_and_clear_bit(SLF_RXEVENT, &sl->flags)) { + netdev_dbg(sl->dev, "sllin_kthread RXEVENT\n"); + } + if (test_and_clear_bit(SLF_ERROR, &sl->flags)) { + unsigned long usleep_range_min; + unsigned long usleep_range_max; + hrtimer_cancel(&sl->rx_timer); + netdev_dbg(sl->dev, "sllin_kthread ERROR\n"); + + if (sl->lin_state != SLSTATE_IDLE) + sllin_report_error(sl, LIN_ERR_FRAMING); + + usleep_range_min = (1000000l * SLLIN_SAMPLES_PER_CHAR * 10) / + sl->lin_baud; + usleep_range_max = usleep_range_min + 50; + usleep_range(usleep_range_min, usleep_range_max); + sllin_reset_buffs(sl); + sl->lin_state = SLSTATE_IDLE; } if (test_and_clear_bit(SLF_TXEVENT, &sl->flags)) { + netdev_dbg(sl->dev, "sllin_kthread TXEVENT\n"); + } + if (test_and_clear_bit(SLF_TMOUTEVENT, &sl->flags)) { + netdev_dbg(sl->dev, "sllin_kthread TMOUTEVENT\n"); + sllin_reset_buffs(sl); + + sl->lin_state = SLSTATE_IDLE; } switch (sl->lin_state) { - case SLSTATE_BREAK_SENT: - if (sl->rx_cnt <= SLLIN_BUFF_BREAK) - continue; + case SLSTATE_IDLE: + if (!test_bit(SLF_MSGEVENT, &sl->flags)) + break; + + mode = 0; + cf = (struct can_frame *)sl->tx_req_skb->data; + + if (cf->can_id & LIN_CHECKSUM_EXTENDED) + mode |= SLLIN_STPMSG_CHCKSUM_ENH; - res = sltty_change_speed(tty, sl->lin_baud); + /* SFF RTR CAN frame -> LIN header */ + if (cf->can_id & CAN_RTR_FLAG) { + struct sllin_conf_entry *sce; + netdev_dbg(sl->dev, "%s: RTR SFF CAN frame, ID = %x\n", + __func__, cf->can_id & LIN_ID_MASK); + + sce = &sl->linfr_cache[cf->can_id & LIN_ID_MASK]; + spin_lock_irqsave(&sl->linfr_lock, flags); + if (sce->frame_fl & LIN_CHECKSUM_EXTENDED) + mode |= SLLIN_STPMSG_CHCKSUM_ENH; + + /* Is there Slave response in linfr_cache to be sent? */ + if ((sce->frame_fl & LIN_CACHE_RESPONSE) + && (sce->dlc > 0)) { + + if (sce->frame_fl & LIN_SINGLE_RESPONSE) + sce->frame_fl &= ~LIN_CACHE_RESPONSE; + + 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; + } else { + lin_data = NULL; + lin_dlc = sce->dlc; + } + spin_unlock_irqrestore(&sl->linfr_lock, flags); + + } else { /* SFF NON-RTR CAN frame -> LIN header + LIN response */ + struct sllin_conf_entry *sce; + + netdev_dbg(sl->dev, "%s: NON-RTR SFF CAN frame, ID = %x\n", + __func__, (int)cf->can_id & LIN_ID_MASK); + + sce = &sl->linfr_cache[cf->can_id & LIN_ID_MASK]; + if (sce->frame_fl & LIN_CHECKSUM_EXTENDED) + mode |= SLLIN_STPMSG_CHCKSUM_ENH; + + lin_data = cf->data; + lin_dlc = cf->can_dlc; + if (lin_dlc > SLLIN_DATA_MAX) + lin_dlc = SLLIN_DATA_MAX; + tx_bytes = lin_dlc; + } + + if (sllin_setup_msg(sl, mode, cf->can_id & LIN_ID_MASK, + lin_data, lin_dlc) != -1) { + + sl->id_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; + } + + clear_bit(SLF_MSGEVENT, &sl->flags); + 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); + break; + + case SLSTATE_BREAK_SENT: +#ifdef BREAK_BY_BAUD + if (sl->rx_cnt <= SLLIN_BUFF_BREAK) + continue; + + res = sltty_change_speed(tty, sl->lin_baud); +#endif + + sl->lin_state = SLSTATE_ID_SENT; + sllin_send_tx_buff(sl); + break; + + case SLSTATE_ID_SENT: + hrtimer_cancel(&sl->rx_timer); + sl->id_to_send = false; + if (sl->data_to_send) { sllin_send_tx_buff(sl); + sl->lin_state = SLSTATE_RESPONSE_SENT; + sl->rx_expect = sl->tx_lim; + goto slstate_response_sent; + } else { + 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; - sl->lin_state = SLSTATE_ID_SENT; + 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] & LIN_ID_MASK)) { + hrtimer_cancel(&sl->rx_timer); + netdev_dbg(sl->dev, "received LIN response in a CAN frame.\n"); + if (sllin_setup_msg(sl, SLLIN_STPMSG_RESPONLY, + cf->can_id & LIN_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; + } + } - break; - } + /* Be aware, no BREAK here */ + case SLSTATE_RESPONSE_WAIT_BUS: + if (sl->rx_cnt < sl->rx_expect) + continue; + hrtimer_cancel(&sl->rx_timer); + netdev_dbg(sl->dev, "response received ID %d len %d\n", + sl->rx_buff[SLLIN_BUFF_ID], sl->rx_cnt - SLLIN_BUFF_DATA - 1); + + if (sllin_rx_validate(sl) == -1) { + netdev_dbg(sl->dev, "RX validation failed.\n"); + sllin_report_error(sl, LIN_ERR_CHECKSUM); + } else { + /* Send CAN non-RTR frame with data */ + netdev_dbg(sl->dev, "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; - /* sll_bump(sl); send packet to the network layer */ + 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)) { + + if (sce->frame_fl & LIN_SINGLE_RESPONSE) + sce->frame_fl &= ~LIN_CACHE_RESPONSE; + + 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); + } + + 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; - /* sl->dev->stats.tx_packets++; send frames statistic */ - /* netif_wake_queue(sl->dev); allow next Tx packet arrival */ - } + case SLSTATE_RESPONSE_SENT: +slstate_response_sent: + if (sl->rx_cnt < sl->tx_lim) + continue; + hrtimer_cancel(&sl->rx_timer); + sll_bump(sl); /* send packet to the network layer */ + netdev_dbg(sl->dev, "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; + sl->lin_state = SLSTATE_IDLE; + break; + } + } - printk(KERN_INFO "sllin: sllin_kwthread stopped.\n"); + hrtimer_cancel(&sl->rx_timer); + netdev_dbg(sl->dev, "sllin_kwthread stopped.\n"); return 0; } @@ -620,7 +1499,7 @@ static void sll_sync(void) break; sl = netdev_priv(dev); - if (sl->tty || sl->leased) + if (sl->tty) continue; if (dev->flags & IFF_UP) dev_close(dev); @@ -661,18 +1540,23 @@ static struct sllin *sll_alloc(dev_t line) char name[IFNAMSIZ]; sprintf(name, "sllin%d", i); +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0)) dev = alloc_netdev(sizeof(*sl), name, sll_setup); +#else + dev = alloc_netdev(sizeof(*sl), name, NET_NAME_UNKNOWN, sll_setup); +#endif + if (!dev) return NULL; dev->base_addr = i; } sl = netdev_priv(dev); - /* Initialize channel control data */ sl->magic = SLLIN_MAGIC; sl->dev = dev; spin_lock_init(&sl->lock); + spin_lock_init(&sl->linfr_lock); sllin_devs[i] = dev; return sl; @@ -692,7 +1576,8 @@ static int sllin_open(struct tty_struct *tty) { struct sllin *sl; int err; - pr_debug("sllin: %s() invoked\n", __FUNCTION__); + + pr_debug("sllin: %s() invoked\n", __func__); if (!capable(CAP_NET_ADMIN)) return -EPERM; @@ -728,16 +1613,26 @@ static int sllin_open(struct tty_struct *tty) if (!test_bit(SLF_INUSE, &sl->flags)) { /* Perform the low-level SLLIN initialization. */ - sl->rx_cnt = 0; - sl->rx_expect = 0; - sl->tx_cnt = 0; - sl->tx_lim = 0; + sl->lin_master = master; + if (master) + pr_debug("sllin: Configured as MASTER\n"); + else + pr_debug("sllin: Configured as SLAVE\n"); + + sllin_reset_buffs(sl); - sl->lin_baud = 2400; + sl->lin_baud = (baudrate == 0) ? LIN_DEFAULT_BAUDRATE : baudrate; + pr_debug("sllin: Baudrate set to %u\n", sl->lin_baud); - sl->lin_master = 1; 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); @@ -748,11 +1643,15 @@ static int sllin_open(struct tty_struct *tty) err = register_netdevice(sl->dev); if (err) goto err_free_chan_and_thread; + +#ifdef SLLIN_LED_TRIGGER + devm_sllin_led_init(sl->dev); +#endif } /* Done. We have linked the TTY line to a channel. */ rtnl_unlock(); - tty->receive_room = SLLIN_BUFF_LEN * 40; /* We don't flow control */ + tty->receive_room = SLLIN_BUFF_LEN * 40; /* We don't flow control */ /* TTY layer expects 0 on success */ return 0; @@ -794,8 +1693,6 @@ static void sllin_close(struct tty_struct *tty) tty->disc_data = NULL; sl->tty = NULL; - if (!sl->leased) - sl->line = 0; /* Flush network side */ unregister_netdev(sl->dev); @@ -850,24 +1747,37 @@ static int __init sllin_init(void) { int status; +#ifdef SLLIN_LED_TRIGGER + status = register_netdevice_notifier(&sllin_netdev_notifier); + if (status) + pr_err("sllin: can't register netdevice notifier\n"); +#endif + if (maxdev < 4) 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) { - printk(KERN_ERR "sllin: can't allocate sllin device array!\n"); + pr_err("sllin: can't allocate sllin device array!\n"); return -ENOMEM; } /* Fill in our line protocol discipline, and register it */ status = tty_register_ldisc(N_SLLIN, &sll_ldisc); if (status) { - printk(KERN_ERR "sllin: can't register line discipline\n"); + pr_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; } @@ -914,8 +1824,7 @@ static void __exit sllin_exit(void) sl = netdev_priv(dev); if (sl->tty) { - printk(KERN_ERR "%s: tty discipline still running\n", - dev->name); + netdev_dbg(sl->dev, "tty discipline still running\n"); /* Intentionally leak the control block. */ dev->destructor = NULL; } @@ -928,7 +1837,12 @@ static void __exit sllin_exit(void) i = tty_unregister_ldisc(N_SLLIN); if (i) - printk(KERN_ERR "sllin: can't unregister ldisc (err %d)\n", i); + pr_err("sllin: can't unregister ldisc (err %d)\n", i); + +#ifdef SLLIN_LED_TRIGGER + unregister_netdevice_notifier(&sllin_netdev_notifier); +#endif + } module_init(sllin_init);