* Funded by: Volkswagen Group Research
*/
-#define DEBUG 1 /* Enables pr_debug() printouts */
+//#define DEBUG 1 /* Enables pr_debug() printouts */
+//#define SLLIN_LED_TRIGGER /* Enables led triggers */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/can.h>
#include <linux/kthread.h>
#include <linux/hrtimer.h>
+#include <linux/version.h>
#include "linux/lin_bus.h"
/* Should be in include/linux/tty.h */
#define N_SLLIN 25
/* -------------------------------- */
+#ifdef SLLIN_LED_TRIGGER
+#define SLLIN_LED_NAME_SZ (IFNAMSIZ + 6)
+#include <linux/leds.h>
+
+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";
static bool master = true;
static int baudrate; /* Use LIN_DEFAULT_BAUDRATE when not set */
-module_param(master, bool, 0);
+module_param(master, bool, 0444);
MODULE_PARM_DESC(master, "LIN interface is Master device");
-module_param(baudrate, int, 0);
+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*/
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,
};
/* 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;
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
*/
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);
+#else
+ down_write(&tty->termios_rwsem);
+#endif
- 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);
if (tty->ops->set_termios)
tty->ops->set_termios(tty, &old_termios);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0)
mutex_unlock(&tty->termios_mutex);
+#else
+ up_write(&tty->termios_rwsem);
+#endif
return 0;
}
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
}
/**
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;
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)));
sl->tx_lim = 0;
spin_unlock_bh(&sl->lock);
+#ifdef SLLIN_LED_TRIGGER
+ sllin_led_event(dev, SLLIN_LED_EVENT_STOP);
+#endif
return 0;
}
sl->flags &= (1 << SLF_INUSE);
netif_start_queue(dev);
+
+#ifdef SLLIN_LED_TRIGGER
+ sllin_led_event(dev, SLLIN_LED_EVENT_OPEN);
+#endif
return 0;
}
*/
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;
}
- sllin_send_canfr(sl, 0 | CAN_EFF_FLAG |
+ 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);
}
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)
{
/* 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);
spin_lock_irqsave(&sl->linfr_lock, flags);
+ sl->lin_state = SLSTATE_ID_RECEIVED;
/* Is the length of data set in frame cache? */
- if (sce->frame_fl & LIN_CACHE_RESPONSE) {
+ 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;
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) ||
- ((sl->rx_len_unknown == true) && (count == 0)))) {
+ ((sl->rx_cnt >= sl->rx_expect))) {
- sll_bump(sl);
+ 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);
- /* 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;
+ set_bit(SLF_RXEVENT, &sl->flags);
+ wake_up(&sl->kwt_wq);
}
}
}
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)
sl->tx_cnt, remains);
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:
{
struct sllin *sl = container_of(hrtimer, struct sllin, rx_timer);
- sllin_report_error(sl, LIN_ERR_RX_TIMEOUT);
- set_bit(SLF_TMOUTEVENT, &sl->flags);
+ /*
+ * 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;
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 mode;
+ int lin_id;
+ struct sllin_conf_entry *sce;
netdev_dbg(sl->dev, "sllin_kwthread started.\n");
sched_setscheduler(current, SCHED_FIFO, &schparam);
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_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;
+
/* 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",
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;
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)
tx_bytes = lin_dlc;
}
- if (sllin_setup_msg(sl, 0, cf->can_id & LIN_ID_MASK,
+ if (sllin_setup_msg(sl, mode, cf->can_id & LIN_ID_MASK,
lin_data, lin_dlc) != -1) {
sl->id_to_send = true;
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)) {
+
+ 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;
+
case SLSTATE_RESPONSE_SENT:
slstate_response_sent:
if (sl->rx_cnt < sl->tx_lim)
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;
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. */
{
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 */
i = tty_unregister_ldisc(N_SLLIN);
if (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);
projects / linux-lin.git / blobdiff