-/*
+/*
* sllin.c - serial line LIN interface driver (using tty line discipline)
*
* This file is derived from drivers/net/can/slcan.c
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
- * Idea: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
+ * Idea: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
* Copyright: (c) 2011 Czech Technical University in Prague
* (c) 2011 Volkswagen Group Research
* Authors: Pavel Pisa <pisa@cmp.felk.cvut.cz>
* Funded by: Volkswagen Group Research
*/
-#define DEBUG 1 /* Enables pr_debug() printouts */
+#define DEBUG 1 /* Enables pr_debug() printouts */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include "linux/lin_bus.h"
/* Should be in include/linux/tty.h */
-#define N_SLLIN 25
+#define N_SLLIN 25
/* -------------------------------- */
static __initdata const char banner[] =
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pavel Pisa <pisa@cmp.felk.cvut.cz>");
-#define SLLIN_MAGIC 0x53CA
+#define SLLIN_MAGIC 0x53CA
/* #define BREAK_BY_BAUD */
static int master = true;
-static int baudrate = 0; /* Use LIN_DEFAULT_BAUDRATE when not set */
+static int baudrate; /* Use LIN_DEFAULT_BAUDRATE when not set */
module_param(master, bool, 0);
MODULE_PARM_DESC(master, "LIN interface is Master device");
MODULE_PARM_DESC(maxdev, "Maximum number of sllin interfaces");
/* maximum buffer len to store whole LIN message*/
-#define SLLIN_DATA_MAX 8
+#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
+ 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
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 */
- char id_to_send; /* 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
+ 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 */
/* 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
};
/**
*****************************************/
/**
* sllin_report_error() -- Report an error by sending CAN frame
- * with particular error flag set in can_id
+ * with particular error flag set in can_id
*
* @sl:
* @err: Error flag to be sent.
void sllin_report_error(struct sllin *sl, int err)
{
switch (err) {
- case LIN_ERR_CHECKSUM:
- sl->dev->stats.rx_crc_errors++;
- break;
+ 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_RX_TIMEOUT:
+ sl->dev->stats.rx_errors++;
+ break;
- case LIN_ERR_FRAMING:
- sl->dev->stats.rx_frame_errors++;
- break;
+ case LIN_ERR_FRAMING:
+ sl->dev->stats.rx_frame_errors++;
+ break;
}
sllin_send_canfr(sl, 0 | CAN_EFF_FLAG |
/**
* sllin_checksum() -- Count checksum for particular data
*
- * @data: Pointer to the buffer containing whole LIN
+ * @data: Pointer to the buffer containing whole LIN
* frame (i.e. including break and sync bytes).
- * @length: Length of the buffer.
+ * @length: Length of the buffer.
* @enhanced_fl: Flag determining whether Enhanced or Classic
* checksum should be counted.
*/
if ((sl->lin_state == SLSTATE_IDLE) && sl->lin_master &&
sl->id_to_send) {
- if(sllin_send_break(sl) < 0) {
+ if (sllin_send_break(sl) < 0) {
/* error processing */
}
}
}
switch (sl->lin_state) {
- case SLSTATE_IDLE:
- if (!test_bit(SLF_MSGEVENT, &sl->flags))
- break;
+ case SLSTATE_IDLE:
+ if (!test_bit(SLF_MSGEVENT, &sl->flags))
+ break;
- cf = (struct can_frame *)sl->tx_req_skb->data;
+ cf = (struct can_frame *)sl->tx_req_skb->data;
- /* SFF RTR CAN frame -> LIN header */
- if (cf->can_id & CAN_RTR_FLAG) {
- spin_lock(&sl->lock);
- pr_debug("sllin: %s: RTR SFF CAN frame, ID = %x\n",
- __FUNCTION__, cf->can_id & LIN_ID_MASK);
-
- /* Is there Slave response in linfr_cache to be sent? */
- if ((sl->linfr_cache[cf->can_id & LIN_ID_MASK].frame_fl &
- LIN_LOC_SLAVE_CACHE)
- && (sl->linfr_cache[cf->can_id & LIN_ID_MASK].dlc > 0)) {
-
- pr_debug("sllin: Sending LIN response from linfr_cache\n");
- lin_data = sl->linfr_cache[cf->can_id & LIN_ID_MASK].data;
- lin_dlc = sl->linfr_cache[cf->can_id & LIN_ID_MASK].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 = sl->linfr_cache[cf->can_id & LIN_ID_MASK].dlc;
- }
- spin_unlock(&sl->lock);
- } else { /* SFF NON-RTR CAN frame -> LIN header + LIN response */
- pr_debug("sllin: %s: NON-RTR SFF CAN frame, ID = %x\n",
- __FUNCTION__, (int)cf->can_id & LIN_ID_MASK);
+ /* SFF RTR CAN frame -> LIN header */
+ if (cf->can_id & CAN_RTR_FLAG) {
+ spin_lock(&sl->lock);
+ pr_debug("sllin: %s: RTR SFF CAN frame, ID = %x\n",
+ __FUNCTION__, cf->can_id & LIN_ID_MASK);
- lin_data = cf->data;
- lin_dlc = cf->can_dlc;
+ /* Is there Slave response in linfr_cache to be sent? */
+ if ((sl->linfr_cache[cf->can_id & LIN_ID_MASK].frame_fl &
+ LIN_LOC_SLAVE_CACHE)
+ && (sl->linfr_cache[cf->can_id & LIN_ID_MASK].dlc > 0)) {
+
+ pr_debug("sllin: Sending LIN response from linfr_cache\n");
+ lin_data = sl->linfr_cache[cf->can_id & LIN_ID_MASK].data;
+ lin_dlc = sl->linfr_cache[cf->can_id & LIN_ID_MASK].dlc;
if (lin_dlc > SLLIN_DATA_MAX)
lin_dlc = SLLIN_DATA_MAX;
- tx_bytes = lin_dlc;
+ memcpy(lin_data_buff, lin_data, lin_dlc);
+ lin_data = lin_data_buff;
+ } else {
+ lin_data = NULL;
+ lin_dlc = sl->linfr_cache[cf->can_id & LIN_ID_MASK].dlc;
}
+ spin_unlock(&sl->lock);
+ } else { /* SFF NON-RTR CAN frame -> LIN header + LIN response */
+ pr_debug("sllin: %s: NON-RTR SFF CAN frame, ID = %x\n",
+ __FUNCTION__, (int)cf->can_id & LIN_ID_MASK);
+
+ 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, 0, cf->can_id & LIN_ID_MASK,
- lin_data, lin_dlc) != -1) {
+ if (sllin_setup_msg(sl, 0, 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;
- }
+ 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;
+ 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:
+ case SLSTATE_BREAK_SENT:
#ifdef BREAK_BY_BAUD
- if (sl->rx_cnt <= SLLIN_BUFF_BREAK)
- continue;
+ if (sl->rx_cnt <= SLLIN_BUFF_BREAK)
+ continue;
- res = sltty_change_speed(tty, sl->lin_baud);
+ res = sltty_change_speed(tty, sl->lin_baud);
#endif
- sl->lin_state = SLSTATE_ID_SENT;
- sllin_send_tx_buff(sl);
- break;
+ 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;
+ 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 {
- 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;
+ sl->rx_expect = SLLIN_BUFF_DATA + 2;
}
- break;
+ 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;
- 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);
- pr_debug("sllin: 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;
- }
- }
+ 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;
- /* Be aware, no BREAK here */
- case SLSTATE_RESPONSE_WAIT_BUS:
- if (sl->rx_cnt < sl->rx_expect)
- continue;
+ 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);
+ pr_debug("sllin: 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;
+ }
- hrtimer_cancel(&sl->rx_timer);
- pr_debug("sllin: response received ID %d len %d\n",
- sl->rx_buff[SLLIN_BUFF_ID], sl->rx_cnt - SLLIN_BUFF_DATA - 1);
+ sllin_send_tx_buff(sl);
+ clear_bit(SLF_MSGEVENT, &sl->flags);
+ kfree_skb(sl->tx_req_skb);
+ netif_wake_queue(sl->dev);
- if (sllin_rx_validate(sl) == -1) {
- pr_debug("sllin: RX validation failed.\n");
- sllin_report_error(sl, LIN_ERR_CHECKSUM);
+ sl->lin_state = SLSTATE_RESPONSE_SENT;
+ goto slstate_response_sent;
+ }
} else {
- /* Send CAN non-RTR frame with data */
- pr_debug("sllin: sending NON-RTR CAN"
- "frame with LIN payload.");
- sll_bump(sl); /* send packet to the network layer */
+ sl->lin_state = SLSTATE_RESPONSE_WAIT_BUS;
}
+ }
- sl->id_to_send = false;
- sl->lin_state = SLSTATE_IDLE;
- break;
+ /* Be aware, no BREAK here */
+ case SLSTATE_RESPONSE_WAIT_BUS:
+ if (sl->rx_cnt < sl->rx_expect)
+ continue;
- case SLSTATE_RESPONSE_SENT:
- slstate_response_sent:
- if (sl->rx_cnt < sl->tx_lim)
- continue;
+ hrtimer_cancel(&sl->rx_timer);
+ pr_debug("sllin: response received ID %d len %d\n",
+ sl->rx_buff[SLLIN_BUFF_ID], sl->rx_cnt - SLLIN_BUFF_DATA - 1);
- hrtimer_cancel(&sl->rx_timer);
+ if (sllin_rx_validate(sl) == -1) {
+ pr_debug("sllin: RX validation failed.\n");
+ sllin_report_error(sl, LIN_ERR_CHECKSUM);
+ } else {
+ /* Send CAN non-RTR frame with data */
+ pr_debug("sllin: sending NON-RTR CAN"
+ "frame with LIN payload.");
sll_bump(sl); /* send packet to the network layer */
- pr_debug("sllin: 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;
+ sl->id_to_send = false;
+ sl->lin_state = SLSTATE_IDLE;
+ break;
+
+ 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 */
+ pr_debug("sllin: 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;
}
}
projects / linux-lin.git / commitdiff