sllin: Add first support for LIN slave task on slave node

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>

diff --git a/sllin/sllin.c b/sllin/sllin.c
index 36f23a5465f121c1d4be3ecbc68fe80b120e5660..3e020b1a07ce93d2f1856fa1fdcc0e992d3d4406 100644 (file)
--- a/sllin/sllin.c
+++ b/sllin/sllin.c
@@ -113,6 +113,7 @@ 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,
 };
 
@@ -755,10 +756,13 @@ static void sllin_slave_receive_buf(struct tty_struct *tty,
 
                        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) {
                                sl->rx_expect += sce->dlc + 1; /* + checksum */
                                sl->rx_len_unknown = false;
+                               set_bit(SLF_MSGEVENT, &sl->flags);
+                               wake_up(&sl->kwt_wq);
                        } else {
                                sl->rx_expect += SLLIN_DATA_MAX + 1; /* + checksum */
                                sl->rx_len_unknown = true;
@@ -784,6 +788,8 @@ static void sllin_slave_receive_buf(struct tty_struct *tty,
                                        sl->rx_expect);
                        sllin_slave_finish_rx_msg(sl);
 
+                       set_bit(SLF_RXEVENT, &sl->flags);
+                       wake_up(&sl->kwt_wq);
                }
        }
 }
@@ -956,7 +962,9 @@ static int sllin_kwthread(void *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);
@@ -984,7 +992,8 @@ static int sllin_kwthread(void *ptr)
                        test_bit(SLF_TMOUTEVENT, &sl->flags) ||
                        test_bit(SLF_ERROR, &sl->flags) ||
                        (((sl->lin_state == SLSTATE_IDLE) ||
-                               (sl->lin_state == SLSTATE_RESPONSE_WAIT))
+                               (sl->lin_state == SLSTATE_RESPONSE_WAIT) ||
+                               (sl->lin_state == SLSTATE_ID_RECEIVED))
                                && test_bit(SLF_MSGEVENT, &sl->flags)));
 
                if (test_and_clear_bit(SLF_RXEVENT, &sl->flags)) {
@@ -1028,7 +1037,6 @@ static 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",
@@ -1177,6 +1185,56 @@ 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)
+                                       && (test_bit(SLF_MSGEVENT, &sl->flags))) {
+                               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 (sl->rx_buff[SLLIN_BUFF_ID] & 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);
+                               }
+
+                               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);
+                       }
+                       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)