*/
//#define DEBUG 1 /* Enables pr_debug() printouts */
+//#define SLLIN_LED_TRIGGER /* Enables led triggers */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/version.h>
#include "linux/lin_bus.h"
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)
+#include <uapi/linux/sched/types.h>
+#endif
+
/* 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 */
+#ifndef BREAK_BY_BAUD
+static bool break_by_baud = false;
+#else /*BREAK_BY_BAUD*/
+static bool break_by_baud = true;
+#endif /*BREAK_BY_BAUD*/
-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");
+module_param(break_by_baud, bool, 0444);
+MODULE_PARM_DESC(break_by_baud, "Break is sent by temporal baudrate switching");
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*/
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 */
+ bool lin_break_by_baud; /* send break character by baudrate switching */
int lin_baud; /* LIN baudrate */
int lin_state; /* state */
char id_to_send; /* there is ID to be 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
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
}
/**
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 sll_setup(struct net_device *dev)
{
dev->netdev_ops = &sll_netdev_ops;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,12,0)
dev->destructor = sll_free_netdev;
+#else /* Linux 4.12.0+ */
+ dev->priv_destructor = sll_free_netdev;
+#endif /* Linux 4.12.0+ */
dev->hard_header_len = 0;
dev->addr_len = 0;
}
}
-#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;
+ if (!sl->lin_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);
smp_mb__after_atomic();
#endif
-#ifdef BREAK_BY_BAUD
- if (sl->lin_state != SLSTATE_BREAK_SENT)
+ if (sl->lin_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;
-#else
- remains = sl->tx_lim - sl->tx_cnt;
-#endif
+ }
res = tty->ops->write(tty, sl->tx_buff + sl->tx_cnt, remains);
if (res < 0)
} 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:
}
-#ifdef BREAK_BY_BAUD
-static int sllin_send_break(struct sllin *sl)
+static int sllin_send_break_by_baud(struct sllin *sl)
{
struct tty_struct *tty = sl->tty;
unsigned long break_baud;
break_baud = ((sl->lin_baud * 2) / 3);
sltty_change_speed(tty, break_baud);
- tty->ops->flush_buffer(tty);
+ if (tty->ops->flush_buffer != NULL) {
+ tty->ops->flush_buffer(tty);
+ } else {
+ netdev_dbg(sl->dev, "flush_buffer is not implemented.\n");
+ }
sl->rx_cnt = SLLIN_BUFF_BREAK;
sl->rx_expect = SLLIN_BUFF_BREAK + 1;
return 0;
}
-#else /* BREAK_BY_BAUD */
-static int sllin_send_break(struct sllin *sl)
+static int sllin_send_break_by_usleep(struct sllin *sl)
{
struct tty_struct *tty = sl->tty;
int retval;
usleep_range_max = usleep_range_min + 30;
usleep_range(usleep_range_min, usleep_range_max);
- tty->ops->flush_buffer(tty);
+ if (tty != NULL && tty->ops != NULL && tty->ops->flush_buffer != NULL) {
+ tty->ops->flush_buffer(tty);
+ } else {
+ netdev_dbg(sl->dev, "flush_buffer is not implemented.\n");
+ }
sl->tx_cnt = SLLIN_BUFF_SYNC;
return 0;
}
-#endif /* BREAK_BY_BAUD */
+static int sllin_send_break(struct sllin *sl)
+{
+ if (sl->lin_break_by_baud)
+ return sllin_send_break_by_baud(sl);
+ else
+ return sllin_send_break_by_usleep(sl);
+}
static enum hrtimer_restart sllin_rx_timeout_handler(struct hrtimer *hrtimer)
{
/* 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);
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);
break;
case SLSTATE_BREAK_SENT:
-#ifdef BREAK_BY_BAUD
- if (sl->rx_cnt <= SLLIN_BUFF_BREAK)
- continue;
+ if (sl->lin_break_by_baud) {
+ if (sl->rx_cnt <= SLLIN_BUFF_BREAK)
+ continue;
- res = sltty_change_speed(tty, sl->lin_baud);
-#endif
+ sltty_change_speed(tty, sl->lin_baud);
+ }
sl->lin_state = SLSTATE_ID_SENT;
sllin_send_tx_buff(sl);
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;
sl->lin_baud = (baudrate == 0) ? LIN_DEFAULT_BAUDRATE : baudrate;
pr_debug("sllin: Baudrate set to %u\n", sl->lin_baud);
+ sl->lin_break_by_baud = break_by_baud;
+
+ if (tty->ops->break_ctl == NULL && !sl->lin_break_by_baud) {
+ sl->lin_break_by_baud = true;
+ pr_notice ("sllin: break_ctl, switching to break_by_baud\n");
+ }
+
sl->lin_state = SLSTATE_IDLE;
hrtimer_init(&sl->rx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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 */
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
+ if (break_by_baud)
+ pr_debug("sllin: Break is generated by baud-rate change.");
+ else
+ pr_debug("sllin: Break is generated manually with tiny sleep.");
return status;
}
if (sl->tty) {
netdev_dbg(sl->dev, "tty discipline still running\n");
/* Intentionally leak the control block. */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,12,0)
dev->destructor = NULL;
+#else /* Linux 4.12.0+ */
+ dev->priv_destructor = NULL;
+#endif /* Linux 4.12.0+ */
}
unregister_netdev(dev);
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