#define SLLIN_BUFF_DATA 3
#define SLLIN_ID_MASK 0x3f
+#define SLLIN_ID_MAX SLLIN_ID_MASK
enum slstate {
SLSTATE_IDLE = 0,
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 particualr 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))
+ 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;
struct hrtimer rx_timer; /* RX timeout timer */
ktime_t rx_timer_timeout; /* RX timeout timer value */
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;
/*****************************************
* sllin message helper routines
*****************************************/
+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];
+ printk(KERN_INFO "Setting frame cache with EFF CAN frame. "
+ "LIN ID = %d\n", cf->can_id & SLLIN_ID_MASK);
+
+ sce->dlc = (cf->can_dlc > 8) ? 8 : cf->can_dlc;
+ sce->frame_fl = (cf->can_id & ~SLLIN_ID_MASK) & CAN_EFF_MASK;
+ memcpy(sce->data, cf->data, cf->can_dlc);
+
+ return 0;
+}
int sllin_setup_msg(struct sllin *sl, int mode, int id,
unsigned char *data, int len)
struct sched_param schparam = { .sched_priority = 40 };
int res;
struct can_frame *cf;
+ char *lin_data;
+ int lin_dlc;
+ int tx_bytes = 0; /* Used for Network statistics */
+
printk(KERN_INFO "sllin: sllin_kwthread started.\n");
sched_setscheduler(current, SCHED_FIFO, &schparam);
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 (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;
- }
- } 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) {
- sl->id_to_send = true;
- sl->data_to_send = true;
+ /* EFF CAN frame -> "Configuration" frame */
+ if (cf->can_id & CAN_EFF_FLAG) {
+ sllin_configure_frame_cache(sl, cf);
+ goto free_skb;
+ } /* SFF RTR CAN frame -> LIN header */
+ else if (cf->can_id & CAN_RTR_FLAG) {
+ printk(KERN_INFO "%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)) {
+
+ printk(KERN_INFO "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;
+ } else {
+ lin_data = NULL;
+ lin_dlc = 0;
}
+ } else { /* SFF NON-RTR CAN frame -> LIN header + LIN response */
+ printk(KERN_INFO "%s: NON-RTR SFF CAN frame, ID = %x\n",
+ __FUNCTION__, (int)cf->can_id & SLLIN_ID_MASK);
+
+ lin_data = cf->data;
+ lin_dlc = tx_bytes = cf->can_dlc;
+ }
+
+ 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 = (lin_dlc > 0) ? true : false;
+ sl->dev->stats.tx_packets++;
+ sl->dev->stats.tx_bytes += tx_bytes;
}
- release_skb:
+ free_skb:
clear_bit(SLF_MSGEVENT, &sl->flags);
kfree_skb(sl->rec_skb);
netif_wake_queue(sl->dev);
hrtimer_cancel(&sl->rx_timer);
printk(KERN_INFO "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
+ // FIXME: check checksum in sl->rx_buff
+
// send CAN non-RTR frame with data
printk(KERN_INFO "sllin: sending NON-RTR CAN frame with LIN payload.");
sll_bump(sl); //send packet to the network layer
if (sl->rx_cnt < sl->tx_lim)
continue;
+ sll_bump(sl); //send packet to the network layer
printk(KERN_INFO "sllin: response sent ID %d len %d\n",
sl->rx_buff[SLLIN_BUFF_ID], sl->rx_cnt - SLLIN_BUFF_DATA - 1);
}
sl = netdev_priv(dev);
-
/* Initialize channel control data */
sl->magic = SLLIN_MAGIC;
sl->dev = dev;