#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/errno.h>
-#include <linux/string.h> /* used in new tty drivers */
-#include <linux/signal.h> /* used in new tty drivers */
+#include <linux/string.h> /* used in new tty drivers */
+#include <linux/signal.h> /* used in new tty drivers */
#include <linux/ioctl.h>
#include <linux/n_r3964.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <asm/uaccess.h>
-
-//#define DEBUG_QUEUE
+/*#define DEBUG_QUEUE*/
/* Log successful handshake and protocol operations */
-//#define DEBUG_PROTO_S
+/*#define DEBUG_PROTO_S*/
/* Log handshake and protocol errors: */
-//#define DEBUG_PROTO_E
+/*#define DEBUG_PROTO_E*/
/* Log Linediscipline operations (open, close, read, write...): */
-//#define DEBUG_LDISC
+/*#define DEBUG_LDISC*/
/* Log module and memory operations (init, cleanup; kmalloc, kfree): */
-//#define DEBUG_MODUL
+/*#define DEBUG_MODUL*/
/* Macro helpers for debug output: */
-#define TRACE(format, args...) printk("r3964: " format "\n" , ## args);
+#define TRACE(format, args...) printk("r3964: " format "\n" , ## args)
#ifdef DEBUG_MODUL
-#define TRACE_M(format, args...) printk("r3964: " format "\n" , ## args);
+#define TRACE_M(format, args...) printk("r3964: " format "\n" , ## args)
#else
-#define TRACE_M(fmt, arg...) /**/
+#define TRACE_M(fmt, arg...) do {} while (0)
#endif
-
#ifdef DEBUG_PROTO_S
-#define TRACE_PS(format, args...) printk("r3964: " format "\n" , ## args);
+#define TRACE_PS(format, args...) printk("r3964: " format "\n" , ## args)
#else
-#define TRACE_PS(fmt, arg...) /**/
+#define TRACE_PS(fmt, arg...) do {} while (0)
#endif
-
#ifdef DEBUG_PROTO_E
-#define TRACE_PE(format, args...) printk("r3964: " format "\n" , ## args);
+#define TRACE_PE(format, args...) printk("r3964: " format "\n" , ## args)
#else
-#define TRACE_PE(fmt, arg...) /**/
+#define TRACE_PE(fmt, arg...) do {} while (0)
#endif
-
#ifdef DEBUG_LDISC
-#define TRACE_L(format, args...) printk("r3964: " format "\n" , ## args);
+#define TRACE_L(format, args...) printk("r3964: " format "\n" , ## args)
#else
-#define TRACE_L(fmt, arg...) /**/
+#define TRACE_L(fmt, arg...) do {} while (0)
#endif
-
#ifdef DEBUG_QUEUE
-#define TRACE_Q(format, args...) printk("r3964: " format "\n" , ## args);
+#define TRACE_Q(format, args...) printk("r3964: " format "\n" , ## args)
#else
-#define TRACE_Q(fmt, arg...) /**/
+#define TRACE_Q(fmt, arg...) do {} while (0)
#endif
-
static void add_tx_queue(struct r3964_info *, struct r3964_block_header *);
static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code);
static void put_char(struct r3964_info *pInfo, unsigned char ch);
static void receive_error(struct r3964_info *pInfo, const char flag);
static void on_timeout(unsigned long priv);
static int enable_signals(struct r3964_info *pInfo, struct pid *pid, int arg);
-static int read_telegram(struct r3964_info *pInfo, struct pid *pid, unsigned char __user *buf);
+static int read_telegram(struct r3964_info *pInfo, struct pid *pid,
+ unsigned char __user * buf);
static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg,
- int error_code, struct r3964_block_header *pBlock);
-static struct r3964_message* remove_msg(struct r3964_info *pInfo,
- struct r3964_client_info *pClient);
-static void remove_client_block(struct r3964_info *pInfo,
- struct r3964_client_info *pClient);
+ int error_code, struct r3964_block_header *pBlock);
+static struct r3964_message *remove_msg(struct r3964_info *pInfo,
+ struct r3964_client_info *pClient);
+static void remove_client_block(struct r3964_info *pInfo,
+ struct r3964_client_info *pClient);
-static int r3964_open(struct tty_struct *tty);
+static int r3964_open(struct tty_struct *tty);
static void r3964_close(struct tty_struct *tty);
static ssize_t r3964_read(struct tty_struct *tty, struct file *file,
- unsigned char __user *buf, size_t nr);
-static ssize_t r3964_write(struct tty_struct * tty, struct file * file,
- const unsigned char * buf, size_t nr);
-static int r3964_ioctl(struct tty_struct * tty, struct file * file,
- unsigned int cmd, unsigned long arg);
-static void r3964_set_termios(struct tty_struct *tty, struct ktermios * old);
-static unsigned int r3964_poll(struct tty_struct * tty, struct file * file,
- struct poll_table_struct *wait);
+ unsigned char __user * buf, size_t nr);
+static ssize_t r3964_write(struct tty_struct *tty, struct file *file,
+ const unsigned char *buf, size_t nr);
+static int r3964_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg);
+static void r3964_set_termios(struct tty_struct *tty, struct ktermios *old);
+static unsigned int r3964_poll(struct tty_struct *tty, struct file *file,
+ struct poll_table_struct *wait);
static void r3964_receive_buf(struct tty_struct *tty, const unsigned char *cp,
- char *fp, int count);
+ char *fp, int count);
static struct tty_ldisc tty_ldisc_N_R3964 = {
- .owner = THIS_MODULE,
- .magic = TTY_LDISC_MAGIC,
- .name = "R3964",
- .open = r3964_open,
- .close = r3964_close,
- .read = r3964_read,
- .write = r3964_write,
- .ioctl = r3964_ioctl,
+ .owner = THIS_MODULE,
+ .magic = TTY_LDISC_MAGIC,
+ .name = "R3964",
+ .open = r3964_open,
+ .close = r3964_close,
+ .read = r3964_read,
+ .write = r3964_write,
+ .ioctl = r3964_ioctl,
.set_termios = r3964_set_termios,
- .poll = r3964_poll,
+ .poll = r3964_poll,
.receive_buf = r3964_receive_buf,
};
-
-
static void dump_block(const unsigned char *block, unsigned int length)
{
- unsigned int i,j;
- char linebuf[16*3+1];
-
- for(i=0;i<length;i+=16)
- {
- for(j=0;(j<16) && (j+i<length);j++)
- {
- sprintf(linebuf+3*j,"%02x ",block[i+j]);
- }
- linebuf[3*j]='\0';
- TRACE_PS("%s",linebuf);
- }
+ unsigned int i, j;
+ char linebuf[16 * 3 + 1];
+
+ for (i = 0; i < length; i += 16) {
+ for (j = 0; (j < 16) && (j + i < length); j++) {
+ sprintf(linebuf + 3 * j, "%02x ", block[i + j]);
+ }
+ linebuf[3 * j] = '\0';
+ TRACE_PS("%s", linebuf);
+ }
}
-
-
-
/*************************************************************
* Driver initialisation
*************************************************************/
-
/*************************************************************
* Module support routines
*************************************************************/
static void __exit r3964_exit(void)
{
- int status;
-
- TRACE_M ("cleanup_module()");
-
- status=tty_unregister_ldisc(N_R3964);
-
- if(status!=0)
- {
- printk(KERN_ERR "r3964: error unregistering linediscipline: %d\n", status);
- }
- else
- {
- TRACE_L("linediscipline successfully unregistered");
- }
-
+ int status;
+
+ TRACE_M("cleanup_module()");
+
+ status = tty_unregister_ldisc(N_R3964);
+
+ if (status != 0) {
+ printk(KERN_ERR "r3964: error unregistering linediscipline: "
+ "%d\n", status);
+ } else {
+ TRACE_L("linediscipline successfully unregistered");
+ }
}
static int __init r3964_init(void)
{
- int status;
-
- printk ("r3964: Philips r3964 Driver $Revision: 1.10 $\n");
-
- /*
- * Register the tty line discipline
- */
-
- status = tty_register_ldisc (N_R3964, &tty_ldisc_N_R3964);
- if (status == 0)
- {
- TRACE_L("line discipline %d registered", N_R3964);
- TRACE_L("flags=%x num=%x", tty_ldisc_N_R3964.flags,
- tty_ldisc_N_R3964.num);
- TRACE_L("open=%p", tty_ldisc_N_R3964.open);
- TRACE_L("tty_ldisc_N_R3964 = %p", &tty_ldisc_N_R3964);
- }
- else
- {
- printk (KERN_ERR "r3964: error registering line discipline: %d\n", status);
- }
- return status;
+ int status;
+
+ printk("r3964: Philips r3964 Driver $Revision: 1.10 $\n");
+
+ /*
+ * Register the tty line discipline
+ */
+
+ status = tty_register_ldisc(N_R3964, &tty_ldisc_N_R3964);
+ if (status == 0) {
+ TRACE_L("line discipline %d registered", N_R3964);
+ TRACE_L("flags=%x num=%x", tty_ldisc_N_R3964.flags,
+ tty_ldisc_N_R3964.num);
+ TRACE_L("open=%p", tty_ldisc_N_R3964.open);
+ TRACE_L("tty_ldisc_N_R3964 = %p", &tty_ldisc_N_R3964);
+ } else {
+ printk(KERN_ERR "r3964: error registering line discipline: "
+ "%d\n", status);
+ }
+ return status;
}
module_init(r3964_init);
module_exit(r3964_exit);
-
/*************************************************************
* Protocol implementation routines
*************************************************************/
-static void add_tx_queue(struct r3964_info *pInfo, struct r3964_block_header *pHeader)
+static void add_tx_queue(struct r3964_info *pInfo,
+ struct r3964_block_header *pHeader)
{
- unsigned long flags;
-
- spin_lock_irqsave(&pInfo->lock, flags);
-
- pHeader->next = NULL;
-
- if(pInfo->tx_last == NULL)
- {
- pInfo->tx_first = pInfo->tx_last = pHeader;
- }
- else
- {
- pInfo->tx_last->next = pHeader;
- pInfo->tx_last = pHeader;
- }
-
- spin_unlock_irqrestore(&pInfo->lock, flags);
-
- TRACE_Q("add_tx_queue %p, length %d, tx_first = %p",
- pHeader, pHeader->length, pInfo->tx_first );
+ unsigned long flags;
+
+ spin_lock_irqsave(&pInfo->lock, flags);
+
+ pHeader->next = NULL;
+
+ if (pInfo->tx_last == NULL) {
+ pInfo->tx_first = pInfo->tx_last = pHeader;
+ } else {
+ pInfo->tx_last->next = pHeader;
+ pInfo->tx_last = pHeader;
+ }
+
+ spin_unlock_irqrestore(&pInfo->lock, flags);
+
+ TRACE_Q("add_tx_queue %p, length %d, tx_first = %p",
+ pHeader, pHeader->length, pInfo->tx_first);
}
static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code)
{
- struct r3964_block_header *pHeader;
- unsigned long flags;
+ struct r3964_block_header *pHeader;
+ unsigned long flags;
#ifdef DEBUG_QUEUE
- struct r3964_block_header *pDump;
+ struct r3964_block_header *pDump;
#endif
-
- pHeader = pInfo->tx_first;
- if(pHeader==NULL)
- return;
+ pHeader = pInfo->tx_first;
+
+ if (pHeader == NULL)
+ return;
#ifdef DEBUG_QUEUE
- printk("r3964: remove_from_tx_queue: %p, length %u - ",
- pHeader, pHeader->length );
- for(pDump=pHeader;pDump;pDump=pDump->next)
- printk("%p ", pDump);
- printk("\n");
+ printk("r3964: remove_from_tx_queue: %p, length %u - ",
+ pHeader, pHeader->length);
+ for (pDump = pHeader; pDump; pDump = pDump->next)
+ printk("%p ", pDump);
+ printk("\n");
#endif
+ if (pHeader->owner) {
+ if (error_code) {
+ add_msg(pHeader->owner, R3964_MSG_ACK, 0,
+ error_code, NULL);
+ } else {
+ add_msg(pHeader->owner, R3964_MSG_ACK, pHeader->length,
+ error_code, NULL);
+ }
+ wake_up_interruptible(&pInfo->read_wait);
+ }
+
+ spin_lock_irqsave(&pInfo->lock, flags);
+
+ pInfo->tx_first = pHeader->next;
+ if (pInfo->tx_first == NULL) {
+ pInfo->tx_last = NULL;
+ }
+
+ spin_unlock_irqrestore(&pInfo->lock, flags);
+
+ kfree(pHeader);
+ TRACE_M("remove_from_tx_queue - kfree %p", pHeader);
- if(pHeader->owner)
- {
- if(error_code)
- {
- add_msg(pHeader->owner, R3964_MSG_ACK, 0,
- error_code, NULL);
- }
- else
- {
- add_msg(pHeader->owner, R3964_MSG_ACK, pHeader->length,
- error_code, NULL);
- }
- wake_up_interruptible (&pInfo->read_wait);
- }
-
- spin_lock_irqsave(&pInfo->lock, flags);
-
- pInfo->tx_first = pHeader->next;
- if(pInfo->tx_first==NULL)
- {
- pInfo->tx_last = NULL;
- }
-
- spin_unlock_irqrestore(&pInfo->lock, flags);
-
- kfree(pHeader);
- TRACE_M("remove_from_tx_queue - kfree %p",pHeader);
-
- TRACE_Q("remove_from_tx_queue: tx_first = %p, tx_last = %p",
- pInfo->tx_first, pInfo->tx_last );
+ TRACE_Q("remove_from_tx_queue: tx_first = %p, tx_last = %p",
+ pInfo->tx_first, pInfo->tx_last);
}
-static void add_rx_queue(struct r3964_info *pInfo, struct r3964_block_header *pHeader)
+static void add_rx_queue(struct r3964_info *pInfo,
+ struct r3964_block_header *pHeader)
{
- unsigned long flags;
-
- spin_lock_irqsave(&pInfo->lock, flags);
-
- pHeader->next = NULL;
-
- if(pInfo->rx_last == NULL)
- {
- pInfo->rx_first = pInfo->rx_last = pHeader;
- }
- else
- {
- pInfo->rx_last->next = pHeader;
- pInfo->rx_last = pHeader;
- }
- pInfo->blocks_in_rx_queue++;
-
- spin_unlock_irqrestore(&pInfo->lock, flags);
-
- TRACE_Q("add_rx_queue: %p, length = %d, rx_first = %p, count = %d",
- pHeader, pHeader->length,
- pInfo->rx_first, pInfo->blocks_in_rx_queue);
+ unsigned long flags;
+
+ spin_lock_irqsave(&pInfo->lock, flags);
+
+ pHeader->next = NULL;
+
+ if (pInfo->rx_last == NULL) {
+ pInfo->rx_first = pInfo->rx_last = pHeader;
+ } else {
+ pInfo->rx_last->next = pHeader;
+ pInfo->rx_last = pHeader;
+ }
+ pInfo->blocks_in_rx_queue++;
+
+ spin_unlock_irqrestore(&pInfo->lock, flags);
+
+ TRACE_Q("add_rx_queue: %p, length = %d, rx_first = %p, count = %d",
+ pHeader, pHeader->length,
+ pInfo->rx_first, pInfo->blocks_in_rx_queue);
}
static void remove_from_rx_queue(struct r3964_info *pInfo,
- struct r3964_block_header *pHeader)
+ struct r3964_block_header *pHeader)
{
- unsigned long flags;
- struct r3964_block_header *pFind;
-
- if(pHeader==NULL)
- return;
-
- TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d",
- pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue );
- TRACE_Q("remove_from_rx_queue: %p, length %u",
- pHeader, pHeader->length );
-
- spin_lock_irqsave(&pInfo->lock, flags);
-
- if(pInfo->rx_first == pHeader)
- {
- /* Remove the first block in the linked list: */
- pInfo->rx_first = pHeader->next;
-
- if(pInfo->rx_first==NULL)
- {
- pInfo->rx_last = NULL;
- }
- pInfo->blocks_in_rx_queue--;
- }
- else
- {
- /* Find block to remove: */
- for(pFind=pInfo->rx_first; pFind; pFind=pFind->next)
- {
- if(pFind->next == pHeader)
- {
- /* Got it. */
- pFind->next = pHeader->next;
- pInfo->blocks_in_rx_queue--;
- if(pFind->next==NULL)
- {
- /* Oh, removed the last one! */
- pInfo->rx_last = pFind;
- }
- break;
- }
- }
- }
-
- spin_unlock_irqrestore(&pInfo->lock, flags);
-
- kfree(pHeader);
- TRACE_M("remove_from_rx_queue - kfree %p",pHeader);
-
- TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d",
- pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue );
+ unsigned long flags;
+ struct r3964_block_header *pFind;
+
+ if (pHeader == NULL)
+ return;
+
+ TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d",
+ pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue);
+ TRACE_Q("remove_from_rx_queue: %p, length %u",
+ pHeader, pHeader->length);
+
+ spin_lock_irqsave(&pInfo->lock, flags);
+
+ if (pInfo->rx_first == pHeader) {
+ /* Remove the first block in the linked list: */
+ pInfo->rx_first = pHeader->next;
+
+ if (pInfo->rx_first == NULL) {
+ pInfo->rx_last = NULL;
+ }
+ pInfo->blocks_in_rx_queue--;
+ } else {
+ /* Find block to remove: */
+ for (pFind = pInfo->rx_first; pFind; pFind = pFind->next) {
+ if (pFind->next == pHeader) {
+ /* Got it. */
+ pFind->next = pHeader->next;
+ pInfo->blocks_in_rx_queue--;
+ if (pFind->next == NULL) {
+ /* Oh, removed the last one! */
+ pInfo->rx_last = pFind;
+ }
+ break;
+ }
+ }
+ }
+
+ spin_unlock_irqrestore(&pInfo->lock, flags);
+
+ kfree(pHeader);
+ TRACE_M("remove_from_rx_queue - kfree %p", pHeader);
+
+ TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d",
+ pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue);
}
static void put_char(struct r3964_info *pInfo, unsigned char ch)
{
- struct tty_struct *tty = pInfo->tty;
+ struct tty_struct *tty = pInfo->tty;
- if(tty==NULL)
- return;
+ if (tty == NULL)
+ return;
- if(tty->driver->put_char)
- {
- tty->driver->put_char(tty, ch);
- }
- pInfo->bcc ^= ch;
+ if (tty->driver->put_char) {
+ tty->driver->put_char(tty, ch);
+ }
+ pInfo->bcc ^= ch;
}
static void flush(struct r3964_info *pInfo)
{
- struct tty_struct *tty = pInfo->tty;
+ struct tty_struct *tty = pInfo->tty;
- if(tty==NULL)
- return;
+ if (tty == NULL)
+ return;
- if(tty->driver->flush_chars)
- {
- tty->driver->flush_chars(tty);
- }
+ if (tty->driver->flush_chars) {
+ tty->driver->flush_chars(tty);
+ }
}
static void trigger_transmit(struct r3964_info *pInfo)
{
- unsigned long flags;
-
+ unsigned long flags;
- spin_lock_irqsave(&pInfo->lock, flags);
+ spin_lock_irqsave(&pInfo->lock, flags);
- if((pInfo->state == R3964_IDLE) && (pInfo->tx_first!=NULL))
- {
- pInfo->state = R3964_TX_REQUEST;
- pInfo->nRetry=0;
- pInfo->flags &= ~R3964_ERROR;
- mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
+ if ((pInfo->state == R3964_IDLE) && (pInfo->tx_first != NULL)) {
+ pInfo->state = R3964_TX_REQUEST;
+ pInfo->nRetry = 0;
+ pInfo->flags &= ~R3964_ERROR;
+ mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
- spin_unlock_irqrestore(&pInfo->lock, flags);
+ spin_unlock_irqrestore(&pInfo->lock, flags);
- TRACE_PS("trigger_transmit - sent STX");
+ TRACE_PS("trigger_transmit - sent STX");
- put_char(pInfo, STX);
- flush(pInfo);
+ put_char(pInfo, STX);
+ flush(pInfo);
- pInfo->bcc = 0;
- }
- else
- {
- spin_unlock_irqrestore(&pInfo->lock, flags);
- }
+ pInfo->bcc = 0;
+ } else {
+ spin_unlock_irqrestore(&pInfo->lock, flags);
+ }
}
static void retry_transmit(struct r3964_info *pInfo)
{
- if(pInfo->nRetry<R3964_MAX_RETRIES)
- {
- TRACE_PE("transmission failed. Retry #%d",
- pInfo->nRetry);
- pInfo->bcc = 0;
- put_char(pInfo, STX);
- flush(pInfo);
- pInfo->state = R3964_TX_REQUEST;
- pInfo->nRetry++;
- mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
- }
- else
- {
- TRACE_PE("transmission failed after %d retries",
- R3964_MAX_RETRIES);
-
- remove_from_tx_queue(pInfo, R3964_TX_FAIL);
-
- put_char(pInfo, NAK);
- flush(pInfo);
- pInfo->state = R3964_IDLE;
-
- trigger_transmit(pInfo);
- }
+ if (pInfo->nRetry < R3964_MAX_RETRIES) {
+ TRACE_PE("transmission failed. Retry #%d", pInfo->nRetry);
+ pInfo->bcc = 0;
+ put_char(pInfo, STX);
+ flush(pInfo);
+ pInfo->state = R3964_TX_REQUEST;
+ pInfo->nRetry++;
+ mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
+ } else {
+ TRACE_PE("transmission failed after %d retries",
+ R3964_MAX_RETRIES);
+
+ remove_from_tx_queue(pInfo, R3964_TX_FAIL);
+
+ put_char(pInfo, NAK);
+ flush(pInfo);
+ pInfo->state = R3964_IDLE;
+
+ trigger_transmit(pInfo);
+ }
}
-
static void transmit_block(struct r3964_info *pInfo)
{
- struct tty_struct *tty = pInfo->tty;
- struct r3964_block_header *pBlock = pInfo->tx_first;
- int room=0;
-
- if((tty==NULL) || (pBlock==NULL))
- {
- return;
- }
-
- if(tty->driver->write_room)
- room=tty->driver->write_room(tty);
-
- TRACE_PS("transmit_block %p, room %d, length %d",
- pBlock, room, pBlock->length);
-
- while(pInfo->tx_position < pBlock->length)
- {
- if(room<2)
- break;
-
- if(pBlock->data[pInfo->tx_position]==DLE)
- {
- /* send additional DLE char: */
- put_char(pInfo, DLE);
- }
- put_char(pInfo, pBlock->data[pInfo->tx_position++]);
-
- room--;
- }
-
- if((pInfo->tx_position == pBlock->length) && (room>=3))
- {
- put_char(pInfo, DLE);
- put_char(pInfo, ETX);
- if(pInfo->flags & R3964_BCC)
- {
- put_char(pInfo, pInfo->bcc);
- }
- pInfo->state = R3964_WAIT_FOR_TX_ACK;
- mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
- }
- flush(pInfo);
+ struct tty_struct *tty = pInfo->tty;
+ struct r3964_block_header *pBlock = pInfo->tx_first;
+ int room = 0;
+
+ if ((tty == NULL) || (pBlock == NULL)) {
+ return;
+ }
+
+ if (tty->driver->write_room)
+ room = tty->driver->write_room(tty);
+
+ TRACE_PS("transmit_block %p, room %d, length %d",
+ pBlock, room, pBlock->length);
+
+ while (pInfo->tx_position < pBlock->length) {
+ if (room < 2)
+ break;
+
+ if (pBlock->data[pInfo->tx_position] == DLE) {
+ /* send additional DLE char: */
+ put_char(pInfo, DLE);
+ }
+ put_char(pInfo, pBlock->data[pInfo->tx_position++]);
+
+ room--;
+ }
+
+ if ((pInfo->tx_position == pBlock->length) && (room >= 3)) {
+ put_char(pInfo, DLE);
+ put_char(pInfo, ETX);
+ if (pInfo->flags & R3964_BCC) {
+ put_char(pInfo, pInfo->bcc);
+ }
+ pInfo->state = R3964_WAIT_FOR_TX_ACK;
+ mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
+ }
+ flush(pInfo);
}
static void on_receive_block(struct r3964_info *pInfo)
{
- unsigned int length;
- struct r3964_client_info *pClient;
- struct r3964_block_header *pBlock;
-
- length=pInfo->rx_position;
-
- /* compare byte checksum characters: */
- if(pInfo->flags & R3964_BCC)
- {
- if(pInfo->bcc!=pInfo->last_rx)
- {
- TRACE_PE("checksum error - got %x but expected %x",
- pInfo->last_rx, pInfo->bcc);
- pInfo->flags |= R3964_CHECKSUM;
- }
- }
-
- /* check for errors (parity, overrun,...): */
- if(pInfo->flags & R3964_ERROR)
- {
- TRACE_PE("on_receive_block - transmission failed error %x",
- pInfo->flags & R3964_ERROR);
-
- put_char(pInfo, NAK);
- flush(pInfo);
- if(pInfo->nRetry<R3964_MAX_RETRIES)
- {
- pInfo->state=R3964_WAIT_FOR_RX_REPEAT;
- pInfo->nRetry++;
- mod_timer(&pInfo->tmr, jiffies + R3964_TO_RX_PANIC);
- }
- else
- {
- TRACE_PE("on_receive_block - failed after max retries");
- pInfo->state=R3964_IDLE;
- }
- return;
- }
-
-
- /* received block; submit DLE: */
- put_char(pInfo, DLE);
- flush(pInfo);
- del_timer_sync(&pInfo->tmr);
- TRACE_PS(" rx success: got %d chars", length);
-
- /* prepare struct r3964_block_header: */
- pBlock = kmalloc(length+sizeof(struct r3964_block_header), GFP_KERNEL);
- TRACE_M("on_receive_block - kmalloc %p",pBlock);
-
- if(pBlock==NULL)
- return;
-
- pBlock->length = length;
- pBlock->data = ((unsigned char*)pBlock)+sizeof(struct r3964_block_header);
- pBlock->locks = 0;
- pBlock->next = NULL;
- pBlock->owner = NULL;
-
- memcpy(pBlock->data, pInfo->rx_buf, length);
-
- /* queue block into rx_queue: */
- add_rx_queue(pInfo, pBlock);
-
- /* notify attached client processes: */
- for(pClient=pInfo->firstClient; pClient; pClient=pClient->next)
- {
- if(pClient->sig_flags & R3964_SIG_DATA)
- {
- add_msg(pClient, R3964_MSG_DATA, length, R3964_OK, pBlock);
- }
- }
- wake_up_interruptible (&pInfo->read_wait);
-
- pInfo->state = R3964_IDLE;
-
- trigger_transmit(pInfo);
-}
+ unsigned int length;
+ struct r3964_client_info *pClient;
+ struct r3964_block_header *pBlock;
+
+ length = pInfo->rx_position;
+
+ /* compare byte checksum characters: */
+ if (pInfo->flags & R3964_BCC) {
+ if (pInfo->bcc != pInfo->last_rx) {
+ TRACE_PE("checksum error - got %x but expected %x",
+ pInfo->last_rx, pInfo->bcc);
+ pInfo->flags |= R3964_CHECKSUM;
+ }
+ }
+
+ /* check for errors (parity, overrun,...): */
+ if (pInfo->flags & R3964_ERROR) {
+ TRACE_PE("on_receive_block - transmission failed error %x",
+ pInfo->flags & R3964_ERROR);
+
+ put_char(pInfo, NAK);
+ flush(pInfo);
+ if (pInfo->nRetry < R3964_MAX_RETRIES) {
+ pInfo->state = R3964_WAIT_FOR_RX_REPEAT;
+ pInfo->nRetry++;
+ mod_timer(&pInfo->tmr, jiffies + R3964_TO_RX_PANIC);
+ } else {
+ TRACE_PE("on_receive_block - failed after max retries");
+ pInfo->state = R3964_IDLE;
+ }
+ return;
+ }
+
+ /* received block; submit DLE: */
+ put_char(pInfo, DLE);
+ flush(pInfo);
+ del_timer_sync(&pInfo->tmr);
+ TRACE_PS(" rx success: got %d chars", length);
+
+ /* prepare struct r3964_block_header: */
+ pBlock = kmalloc(length + sizeof(struct r3964_block_header),
+ GFP_KERNEL);
+ TRACE_M("on_receive_block - kmalloc %p", pBlock);
+
+ if (pBlock == NULL)
+ return;
+
+ pBlock->length = length;
+ pBlock->data = ((unsigned char *)pBlock) +
+ sizeof(struct r3964_block_header);
+ pBlock->locks = 0;
+ pBlock->next = NULL;
+ pBlock->owner = NULL;
+
+ memcpy(pBlock->data, pInfo->rx_buf, length);
+
+ /* queue block into rx_queue: */
+ add_rx_queue(pInfo, pBlock);
+
+ /* notify attached client processes: */
+ for (pClient = pInfo->firstClient; pClient; pClient = pClient->next) {
+ if (pClient->sig_flags & R3964_SIG_DATA) {
+ add_msg(pClient, R3964_MSG_DATA, length, R3964_OK,
+ pBlock);
+ }
+ }
+ wake_up_interruptible(&pInfo->read_wait);
+ pInfo->state = R3964_IDLE;
+
+ trigger_transmit(pInfo);
+}
static void receive_char(struct r3964_info *pInfo, const unsigned char c)
{
- switch(pInfo->state)
- {
- case R3964_TX_REQUEST:
- if(c==DLE)
- {
- TRACE_PS("TX_REQUEST - got DLE");
-
- pInfo->state = R3964_TRANSMITTING;
- pInfo->tx_position = 0;
-
- transmit_block(pInfo);
- }
- else if(c==STX)
- {
- if(pInfo->nRetry==0)
- {
- TRACE_PE("TX_REQUEST - init conflict");
- if(pInfo->priority == R3964_SLAVE)
- {
- goto start_receiving;
- }
- }
- else
- {
- TRACE_PE("TX_REQUEST - secondary init conflict!?"
- " Switching to SLAVE mode for next rx.");
- goto start_receiving;
- }
- }
- else
- {
- TRACE_PE("TX_REQUEST - char != DLE: %x", c);
- retry_transmit(pInfo);
- }
- break;
- case R3964_TRANSMITTING:
- if(c==NAK)
- {
- TRACE_PE("TRANSMITTING - got NAK");
- retry_transmit(pInfo);
- }
- else
- {
- TRACE_PE("TRANSMITTING - got invalid char");
-
- pInfo->state = R3964_WAIT_ZVZ_BEFORE_TX_RETRY;
- mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
- }
- break;
- case R3964_WAIT_FOR_TX_ACK:
- if(c==DLE)
- {
- TRACE_PS("WAIT_FOR_TX_ACK - got DLE");
- remove_from_tx_queue(pInfo, R3964_OK);
-
- pInfo->state = R3964_IDLE;
- trigger_transmit(pInfo);
- }
- else
- {
- retry_transmit(pInfo);
- }
- break;
- case R3964_WAIT_FOR_RX_REPEAT:
- /* FALLTROUGH */
- case R3964_IDLE:
- if(c==STX)
- {
- /* Prevent rx_queue from overflow: */
- if(pInfo->blocks_in_rx_queue >= R3964_MAX_BLOCKS_IN_RX_QUEUE)
- {
- TRACE_PE("IDLE - got STX but no space in rx_queue!");
- pInfo->state=R3964_WAIT_FOR_RX_BUF;
- mod_timer(&pInfo->tmr, jiffies + R3964_TO_NO_BUF);
- break;
- }
+ switch (pInfo->state) {
+ case R3964_TX_REQUEST:
+ if (c == DLE) {
+ TRACE_PS("TX_REQUEST - got DLE");
+
+ pInfo->state = R3964_TRANSMITTING;
+ pInfo->tx_position = 0;
+
+ transmit_block(pInfo);
+ } else if (c == STX) {
+ if (pInfo->nRetry == 0) {
+ TRACE_PE("TX_REQUEST - init conflict");
+ if (pInfo->priority == R3964_SLAVE) {
+ goto start_receiving;
+ }
+ } else {
+ TRACE_PE("TX_REQUEST - secondary init "
+ "conflict!? Switching to SLAVE mode "
+ "for next rx.");
+ goto start_receiving;
+ }
+ } else {
+ TRACE_PE("TX_REQUEST - char != DLE: %x", c);
+ retry_transmit(pInfo);
+ }
+ break;
+ case R3964_TRANSMITTING:
+ if (c == NAK) {
+ TRACE_PE("TRANSMITTING - got NAK");
+ retry_transmit(pInfo);
+ } else {
+ TRACE_PE("TRANSMITTING - got invalid char");
+
+ pInfo->state = R3964_WAIT_ZVZ_BEFORE_TX_RETRY;
+ mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
+ }
+ break;
+ case R3964_WAIT_FOR_TX_ACK:
+ if (c == DLE) {
+ TRACE_PS("WAIT_FOR_TX_ACK - got DLE");
+ remove_from_tx_queue(pInfo, R3964_OK);
+
+ pInfo->state = R3964_IDLE;
+ trigger_transmit(pInfo);
+ } else {
+ retry_transmit(pInfo);
+ }
+ break;
+ case R3964_WAIT_FOR_RX_REPEAT:
+ /* FALLTROUGH */
+ case R3964_IDLE:
+ if (c == STX) {
+ /* Prevent rx_queue from overflow: */
+ if (pInfo->blocks_in_rx_queue >=
+ R3964_MAX_BLOCKS_IN_RX_QUEUE) {
+ TRACE_PE("IDLE - got STX but no space in "
+ "rx_queue!");
+ pInfo->state = R3964_WAIT_FOR_RX_BUF;
+ mod_timer(&pInfo->tmr,
+ jiffies + R3964_TO_NO_BUF);
+ break;
+ }
start_receiving:
- /* Ok, start receiving: */
- TRACE_PS("IDLE - got STX");
- pInfo->rx_position = 0;
- pInfo->last_rx = 0;
- pInfo->flags &= ~R3964_ERROR;
- pInfo->state=R3964_RECEIVING;
- mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
- pInfo->nRetry = 0;
- put_char(pInfo, DLE);
- flush(pInfo);
- pInfo->bcc = 0;
- }
- break;
- case R3964_RECEIVING:
- if(pInfo->rx_position < RX_BUF_SIZE)
- {
- pInfo->bcc ^= c;
-
- if(c==DLE)
- {
- if(pInfo->last_rx==DLE)
- {
- pInfo->last_rx = 0;
- goto char_to_buf;
- }
- pInfo->last_rx = DLE;
- break;
- }
- else if((c==ETX) && (pInfo->last_rx==DLE))
- {
- if(pInfo->flags & R3964_BCC)
- {
- pInfo->state = R3964_WAIT_FOR_BCC;
- mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
- }
- else
- {
- on_receive_block(pInfo);
- }
- }
- else
- {
- pInfo->last_rx = c;
+ /* Ok, start receiving: */
+ TRACE_PS("IDLE - got STX");
+ pInfo->rx_position = 0;
+ pInfo->last_rx = 0;
+ pInfo->flags &= ~R3964_ERROR;
+ pInfo->state = R3964_RECEIVING;
+ mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
+ pInfo->nRetry = 0;
+ put_char(pInfo, DLE);
+ flush(pInfo);
+ pInfo->bcc = 0;
+ }
+ break;
+ case R3964_RECEIVING:
+ if (pInfo->rx_position < RX_BUF_SIZE) {
+ pInfo->bcc ^= c;
+
+ if (c == DLE) {
+ if (pInfo->last_rx == DLE) {
+ pInfo->last_rx = 0;
+ goto char_to_buf;
+ }
+ pInfo->last_rx = DLE;
+ break;
+ } else if ((c == ETX) && (pInfo->last_rx == DLE)) {
+ if (pInfo->flags & R3964_BCC) {
+ pInfo->state = R3964_WAIT_FOR_BCC;
+ mod_timer(&pInfo->tmr,
+ jiffies + R3964_TO_ZVZ);
+ } else {
+ on_receive_block(pInfo);
+ }
+ } else {
+ pInfo->last_rx = c;
char_to_buf:
- pInfo->rx_buf[pInfo->rx_position++] = c;
- mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
- }
- }
- /* else: overflow-msg? BUF_SIZE>MTU; should not happen? */
- break;
- case R3964_WAIT_FOR_BCC:
- pInfo->last_rx = c;
- on_receive_block(pInfo);
- break;
- }
+ pInfo->rx_buf[pInfo->rx_position++] = c;
+ mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
+ }
+ }
+ /* else: overflow-msg? BUF_SIZE>MTU; should not happen? */
+ break;
+ case R3964_WAIT_FOR_BCC:
+ pInfo->last_rx = c;
+ on_receive_block(pInfo);
+ break;
+ }
}
static void receive_error(struct r3964_info *pInfo, const char flag)
{
- switch (flag)
- {
- case TTY_NORMAL:
- break;
- case TTY_BREAK:
- TRACE_PE("received break")
- pInfo->flags |= R3964_BREAK;
- break;
- case TTY_PARITY:
- TRACE_PE("parity error")
- pInfo->flags |= R3964_PARITY;
- break;
- case TTY_FRAME:
- TRACE_PE("frame error")
- pInfo->flags |= R3964_FRAME;
- break;
- case TTY_OVERRUN:
- TRACE_PE("frame overrun")
- pInfo->flags |= R3964_OVERRUN;
- break;
- default:
- TRACE_PE("receive_error - unknown flag %d", flag);
- pInfo->flags |= R3964_UNKNOWN;
- break;
- }
+ switch (flag) {
+ case TTY_NORMAL:
+ break;
+ case TTY_BREAK:
+ TRACE_PE("received break");
+ pInfo->flags |= R3964_BREAK;
+ break;
+ case TTY_PARITY:
+ TRACE_PE("parity error");
+ pInfo->flags |= R3964_PARITY;
+ break;
+ case TTY_FRAME:
+ TRACE_PE("frame error");
+ pInfo->flags |= R3964_FRAME;
+ break;
+ case TTY_OVERRUN:
+ TRACE_PE("frame overrun");
+ pInfo->flags |= R3964_OVERRUN;
+ break;
+ default:
+ TRACE_PE("receive_error - unknown flag %d", flag);
+ pInfo->flags |= R3964_UNKNOWN;
+ break;
+ }
}
static void on_timeout(unsigned long priv)
{
- struct r3964_info *pInfo = (void *)priv;
-
- switch(pInfo->state)
- {
- case R3964_TX_REQUEST:
- TRACE_PE("TX_REQUEST - timeout");
- retry_transmit(pInfo);
- break;
- case R3964_WAIT_ZVZ_BEFORE_TX_RETRY:
- put_char(pInfo, NAK);
- flush(pInfo);
- retry_transmit(pInfo);
- break;
- case R3964_WAIT_FOR_TX_ACK:
- TRACE_PE("WAIT_FOR_TX_ACK - timeout");
- retry_transmit(pInfo);
- break;
- case R3964_WAIT_FOR_RX_BUF:
- TRACE_PE("WAIT_FOR_RX_BUF - timeout");
- put_char(pInfo, NAK);
- flush(pInfo);
- pInfo->state=R3964_IDLE;
- break;
- case R3964_RECEIVING:
- TRACE_PE("RECEIVING - timeout after %d chars",
- pInfo->rx_position);
- put_char(pInfo, NAK);
- flush(pInfo);
- pInfo->state=R3964_IDLE;
- break;
- case R3964_WAIT_FOR_RX_REPEAT:
- TRACE_PE("WAIT_FOR_RX_REPEAT - timeout");
- pInfo->state=R3964_IDLE;
- break;
- case R3964_WAIT_FOR_BCC:
- TRACE_PE("WAIT_FOR_BCC - timeout");
- put_char(pInfo, NAK);
- flush(pInfo);
- pInfo->state=R3964_IDLE;
- break;
- }
+ struct r3964_info *pInfo = (void *)priv;
+
+ switch (pInfo->state) {
+ case R3964_TX_REQUEST:
+ TRACE_PE("TX_REQUEST - timeout");
+ retry_transmit(pInfo);
+ break;
+ case R3964_WAIT_ZVZ_BEFORE_TX_RETRY:
+ put_char(pInfo, NAK);
+ flush(pInfo);
+ retry_transmit(pInfo);
+ break;
+ case R3964_WAIT_FOR_TX_ACK:
+ TRACE_PE("WAIT_FOR_TX_ACK - timeout");
+ retry_transmit(pInfo);
+ break;
+ case R3964_WAIT_FOR_RX_BUF:
+ TRACE_PE("WAIT_FOR_RX_BUF - timeout");
+ put_char(pInfo, NAK);
+ flush(pInfo);
+ pInfo->state = R3964_IDLE;
+ break;
+ case R3964_RECEIVING:
+ TRACE_PE("RECEIVING - timeout after %d chars",
+ pInfo->rx_position);
+ put_char(pInfo, NAK);
+ flush(pInfo);
+ pInfo->state = R3964_IDLE;
+ break;
+ case R3964_WAIT_FOR_RX_REPEAT:
+ TRACE_PE("WAIT_FOR_RX_REPEAT - timeout");
+ pInfo->state = R3964_IDLE;
+ break;
+ case R3964_WAIT_FOR_BCC:
+ TRACE_PE("WAIT_FOR_BCC - timeout");
+ put_char(pInfo, NAK);
+ flush(pInfo);
+ pInfo->state = R3964_IDLE;
+ break;
+ }
}
-static struct r3964_client_info *findClient(
- struct r3964_info *pInfo, struct pid *pid)
+static struct r3964_client_info *findClient(struct r3964_info *pInfo,
+ struct pid *pid)
{
- struct r3964_client_info *pClient;
-
- for(pClient=pInfo->firstClient; pClient; pClient=pClient->next)
- {
- if(pClient->pid == pid)
- {
- return pClient;
- }
- }
- return NULL;
+ struct r3964_client_info *pClient;
+
+ for (pClient = pInfo->firstClient; pClient; pClient = pClient->next) {
+ if (pClient->pid == pid) {
+ return pClient;
+ }
+ }
+ return NULL;
}
static int enable_signals(struct r3964_info *pInfo, struct pid *pid, int arg)
{
- struct r3964_client_info *pClient;
- struct r3964_client_info **ppClient;
- struct r3964_message *pMsg;
-
- if((arg & R3964_SIG_ALL)==0)
- {
- /* Remove client from client list */
- for(ppClient=&pInfo->firstClient; *ppClient; ppClient=&(*ppClient)->next)
- {
- pClient = *ppClient;
-
- if(pClient->pid == pid)
- {
- TRACE_PS("removing client %d from client list", pid_nr(pid));
- *ppClient = pClient->next;
- while(pClient->msg_count)
- {
- pMsg=remove_msg(pInfo, pClient);
- if(pMsg)
- {
- kfree(pMsg);
- TRACE_M("enable_signals - msg kfree %p",pMsg);
- }
- }
- put_pid(pClient->pid);
- kfree(pClient);
- TRACE_M("enable_signals - kfree %p",pClient);
- return 0;
- }
- }
- return -EINVAL;
- }
- else
- {
- pClient=findClient(pInfo, pid);
- if(pClient)
- {
- /* update signal options */
- pClient->sig_flags=arg;
- }
- else
- {
- /* add client to client list */
- pClient=kmalloc(sizeof(struct r3964_client_info), GFP_KERNEL);
- TRACE_M("enable_signals - kmalloc %p",pClient);
- if(pClient==NULL)
- return -ENOMEM;
-
- TRACE_PS("add client %d to client list", pid_nr(pid));
- spin_lock_init(&pClient->lock);
- pClient->sig_flags=arg;
- pClient->pid = get_pid(pid);
- pClient->next=pInfo->firstClient;
- pClient->first_msg = NULL;
- pClient->last_msg = NULL;
- pClient->next_block_to_read = NULL;
- pClient->msg_count = 0;
- pInfo->firstClient=pClient;
- }
- }
-
- return 0;
+ struct r3964_client_info *pClient;
+ struct r3964_client_info **ppClient;
+ struct r3964_message *pMsg;
+
+ if ((arg & R3964_SIG_ALL) == 0) {
+ /* Remove client from client list */
+ for (ppClient = &pInfo->firstClient; *ppClient;
+ ppClient = &(*ppClient)->next) {
+ pClient = *ppClient;
+
+ if (pClient->pid == pid) {
+ TRACE_PS("removing client %d from client list",
+ pid_nr(pid));
+ *ppClient = pClient->next;
+ while (pClient->msg_count) {
+ pMsg = remove_msg(pInfo, pClient);
+ if (pMsg) {
+ kfree(pMsg);
+ TRACE_M("enable_signals - msg "
+ "kfree %p", pMsg);
+ }
+ }
+ put_pid(pClient->pid);
+ kfree(pClient);
+ TRACE_M("enable_signals - kfree %p", pClient);
+ return 0;
+ }
+ }
+ return -EINVAL;
+ } else {
+ pClient = findClient(pInfo, pid);
+ if (pClient) {
+ /* update signal options */
+ pClient->sig_flags = arg;
+ } else {
+ /* add client to client list */
+ pClient = kmalloc(sizeof(struct r3964_client_info),
+ GFP_KERNEL);
+ TRACE_M("enable_signals - kmalloc %p", pClient);
+ if (pClient == NULL)
+ return -ENOMEM;
+
+ TRACE_PS("add client %d to client list", pid_nr(pid));
+ spin_lock_init(&pClient->lock);
+ pClient->sig_flags = arg;
+ pClient->pid = get_pid(pid);
+ pClient->next = pInfo->firstClient;
+ pClient->first_msg = NULL;
+ pClient->last_msg = NULL;
+ pClient->next_block_to_read = NULL;
+ pClient->msg_count = 0;
+ pInfo->firstClient = pClient;
+ }
+ }
+
+ return 0;
}
-static int read_telegram(struct r3964_info *pInfo, struct pid *pid, unsigned char __user *buf)
+static int read_telegram(struct r3964_info *pInfo, struct pid *pid,
+ unsigned char __user * buf)
{
- struct r3964_client_info *pClient;
- struct r3964_block_header *block;
-
- if(!buf)
- {
- return -EINVAL;
- }
-
- pClient=findClient(pInfo,pid);
- if(pClient==NULL)
- {
- return -EINVAL;
- }
-
- block=pClient->next_block_to_read;
- if(!block)
- {
- return 0;
- }
- else
- {
- if (copy_to_user (buf, block->data, block->length))
- return -EFAULT;
-
- remove_client_block(pInfo, pClient);
- return block->length;
- }
-
- return -EINVAL;
+ struct r3964_client_info *pClient;
+ struct r3964_block_header *block;
+
+ if (!buf) {
+ return -EINVAL;
+ }
+
+ pClient = findClient(pInfo, pid);
+ if (pClient == NULL) {
+ return -EINVAL;
+ }
+
+ block = pClient->next_block_to_read;
+ if (!block) {
+ return 0;
+ } else {
+ if (copy_to_user(buf, block->data, block->length))
+ return -EFAULT;
+
+ remove_client_block(pInfo, pClient);
+ return block->length;
+ }
+
+ return -EINVAL;
}
static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg,
- int error_code, struct r3964_block_header *pBlock)
+ int error_code, struct r3964_block_header *pBlock)
{
- struct r3964_message *pMsg;
- unsigned long flags;
-
- if(pClient->msg_count<R3964_MAX_MSG_COUNT-1)
- {
+ struct r3964_message *pMsg;
+ unsigned long flags;
+
+ if (pClient->msg_count < R3964_MAX_MSG_COUNT - 1) {
queue_the_message:
- pMsg = kmalloc(sizeof(struct r3964_message),
- error_code?GFP_ATOMIC:GFP_KERNEL);
- TRACE_M("add_msg - kmalloc %p",pMsg);
- if(pMsg==NULL) {
- return;
- }
-
- spin_lock_irqsave(&pClient->lock, flags);
-
- pMsg->msg_id = msg_id;
- pMsg->arg = arg;
- pMsg->error_code = error_code;
- pMsg->block = pBlock;
- pMsg->next = NULL;
-
- if(pClient->last_msg==NULL)
- {
- pClient->first_msg=pClient->last_msg=pMsg;
- }
- else
- {
- pClient->last_msg->next = pMsg;
- pClient->last_msg=pMsg;
- }
-
- pClient->msg_count++;
-
- if(pBlock!=NULL)
- {
- pBlock->locks++;
- }
- spin_unlock_irqrestore(&pClient->lock, flags);
- }
- else
- {
- if((pClient->last_msg->msg_id == R3964_MSG_ACK)
- && (pClient->last_msg->error_code==R3964_OVERFLOW))
- {
- pClient->last_msg->arg++;
- TRACE_PE("add_msg - inc prev OVERFLOW-msg");
- }
- else
- {
- msg_id = R3964_MSG_ACK;
- arg = 0;
- error_code = R3964_OVERFLOW;
- pBlock = NULL;
- TRACE_PE("add_msg - queue OVERFLOW-msg");
- goto queue_the_message;
- }
- }
- /* Send SIGIO signal to client process: */
- if(pClient->sig_flags & R3964_USE_SIGIO)
- {
- kill_pid(pClient->pid, SIGIO, 1);
- }
+ pMsg = kmalloc(sizeof(struct r3964_message),
+ error_code ? GFP_ATOMIC : GFP_KERNEL);
+ TRACE_M("add_msg - kmalloc %p", pMsg);
+ if (pMsg == NULL) {
+ return;
+ }
+
+ spin_lock_irqsave(&pClient->lock, flags);
+
+ pMsg->msg_id = msg_id;
+ pMsg->arg = arg;
+ pMsg->error_code = error_code;
+ pMsg->block = pBlock;
+ pMsg->next = NULL;
+
+ if (pClient->last_msg == NULL) {
+ pClient->first_msg = pClient->last_msg = pMsg;
+ } else {
+ pClient->last_msg->next = pMsg;
+ pClient->last_msg = pMsg;
+ }
+
+ pClient->msg_count++;
+
+ if (pBlock != NULL) {
+ pBlock->locks++;
+ }
+ spin_unlock_irqrestore(&pClient->lock, flags);
+ } else {
+ if ((pClient->last_msg->msg_id == R3964_MSG_ACK)
+ && (pClient->last_msg->error_code == R3964_OVERFLOW)) {
+ pClient->last_msg->arg++;
+ TRACE_PE("add_msg - inc prev OVERFLOW-msg");
+ } else {
+ msg_id = R3964_MSG_ACK;
+ arg = 0;
+ error_code = R3964_OVERFLOW;
+ pBlock = NULL;
+ TRACE_PE("add_msg - queue OVERFLOW-msg");
+ goto queue_the_message;
+ }
+ }
+ /* Send SIGIO signal to client process: */
+ if (pClient->sig_flags & R3964_USE_SIGIO) {
+ kill_pid(pClient->pid, SIGIO, 1);
+ }
}
static struct r3964_message *remove_msg(struct r3964_info *pInfo,
- struct r3964_client_info *pClient)
+ struct r3964_client_info *pClient)
{
- struct r3964_message *pMsg=NULL;
- unsigned long flags;
-
- if(pClient->first_msg)
- {
- spin_lock_irqsave(&pClient->lock, flags);
-
- pMsg = pClient->first_msg;
- pClient->first_msg = pMsg->next;
- if(pClient->first_msg==NULL)
- {
- pClient->last_msg = NULL;
- }
-
- pClient->msg_count--;
- if(pMsg->block)
- {
- remove_client_block(pInfo, pClient);
- pClient->next_block_to_read = pMsg->block;
- }
- spin_unlock_irqrestore(&pClient->lock, flags);
- }
- return pMsg;
+ struct r3964_message *pMsg = NULL;
+ unsigned long flags;
+
+ if (pClient->first_msg) {
+ spin_lock_irqsave(&pClient->lock, flags);
+
+ pMsg = pClient->first_msg;
+ pClient->first_msg = pMsg->next;
+ if (pClient->first_msg == NULL) {
+ pClient->last_msg = NULL;
+ }
+
+ pClient->msg_count--;
+ if (pMsg->block) {
+ remove_client_block(pInfo, pClient);
+ pClient->next_block_to_read = pMsg->block;
+ }
+ spin_unlock_irqrestore(&pClient->lock, flags);
+ }
+ return pMsg;
}
-static void remove_client_block(struct r3964_info *pInfo,
- struct r3964_client_info *pClient)
+static void remove_client_block(struct r3964_info *pInfo,
+ struct r3964_client_info *pClient)
{
- struct r3964_block_header *block;
-
- TRACE_PS("remove_client_block PID %d", pid_nr(pClient->pid));
-
- block=pClient->next_block_to_read;
- if(block)
- {
- block->locks--;
- if(block->locks==0)
- {
- remove_from_rx_queue(pInfo, block);
- }
- }
- pClient->next_block_to_read = NULL;
-}
+ struct r3964_block_header *block;
+
+ TRACE_PS("remove_client_block PID %d", pid_nr(pClient->pid));
+ block = pClient->next_block_to_read;
+ if (block) {
+ block->locks--;
+ if (block->locks == 0) {
+ remove_from_rx_queue(pInfo, block);
+ }
+ }
+ pClient->next_block_to_read = NULL;
+}
/*************************************************************
* Line discipline routines
static int r3964_open(struct tty_struct *tty)
{
- struct r3964_info *pInfo;
-
- TRACE_L("open");
- TRACE_L("tty=%p, PID=%d, disc_data=%p",
- tty, current->pid, tty->disc_data);
-
- pInfo=kmalloc(sizeof(struct r3964_info), GFP_KERNEL);
- TRACE_M("r3964_open - info kmalloc %p",pInfo);
-
- if(!pInfo)
- {
- printk(KERN_ERR "r3964: failed to alloc info structure\n");
- return -ENOMEM;
- }
-
- pInfo->rx_buf = kmalloc(RX_BUF_SIZE, GFP_KERNEL);
- TRACE_M("r3964_open - rx_buf kmalloc %p",pInfo->rx_buf);
-
- if(!pInfo->rx_buf)
- {
- printk(KERN_ERR "r3964: failed to alloc receive buffer\n");
- kfree(pInfo);
- TRACE_M("r3964_open - info kfree %p",pInfo);
- return -ENOMEM;
- }
-
- pInfo->tx_buf = kmalloc(TX_BUF_SIZE, GFP_KERNEL);
- TRACE_M("r3964_open - tx_buf kmalloc %p",pInfo->tx_buf);
-
- if(!pInfo->tx_buf)
- {
- printk(KERN_ERR "r3964: failed to alloc transmit buffer\n");
- kfree(pInfo->rx_buf);
- TRACE_M("r3964_open - rx_buf kfree %p",pInfo->rx_buf);
- kfree(pInfo);
- TRACE_M("r3964_open - info kfree %p",pInfo);
- return -ENOMEM;
- }
-
- spin_lock_init(&pInfo->lock);
- pInfo->tty = tty;
- init_waitqueue_head (&pInfo->read_wait);
- pInfo->priority = R3964_MASTER;
- pInfo->rx_first = pInfo->rx_last = NULL;
- pInfo->tx_first = pInfo->tx_last = NULL;
- pInfo->rx_position = 0;
- pInfo->tx_position = 0;
- pInfo->last_rx = 0;
- pInfo->blocks_in_rx_queue = 0;
- pInfo->firstClient=NULL;
- pInfo->state=R3964_IDLE;
- pInfo->flags = R3964_DEBUG;
- pInfo->nRetry = 0;
-
- tty->disc_data = pInfo;
- tty->receive_room = 65536;
-
- init_timer(&pInfo->tmr);
- pInfo->tmr.data = (unsigned long)pInfo;
- pInfo->tmr.function = on_timeout;
-
- return 0;
+ struct r3964_info *pInfo;
+
+ TRACE_L("open");
+ TRACE_L("tty=%p, PID=%d, disc_data=%p",
+ tty, current->pid, tty->disc_data);
+
+ pInfo = kmalloc(sizeof(struct r3964_info), GFP_KERNEL);
+ TRACE_M("r3964_open - info kmalloc %p", pInfo);
+
+ if (!pInfo) {
+ printk(KERN_ERR "r3964: failed to alloc info structure\n");
+ return -ENOMEM;
+ }
+
+ pInfo->rx_buf = kmalloc(RX_BUF_SIZE, GFP_KERNEL);
+ TRACE_M("r3964_open - rx_buf kmalloc %p", pInfo->rx_buf);
+
+ if (!pInfo->rx_buf) {
+ printk(KERN_ERR "r3964: failed to alloc receive buffer\n");
+ kfree(pInfo);
+ TRACE_M("r3964_open - info kfree %p", pInfo);
+ return -ENOMEM;
+ }
+
+ pInfo->tx_buf = kmalloc(TX_BUF_SIZE, GFP_KERNEL);
+ TRACE_M("r3964_open - tx_buf kmalloc %p", pInfo->tx_buf);
+
+ if (!pInfo->tx_buf) {
+ printk(KERN_ERR "r3964: failed to alloc transmit buffer\n");
+ kfree(pInfo->rx_buf);
+ TRACE_M("r3964_open - rx_buf kfree %p", pInfo->rx_buf);
+ kfree(pInfo);
+ TRACE_M("r3964_open - info kfree %p", pInfo);
+ return -ENOMEM;
+ }
+
+ spin_lock_init(&pInfo->lock);
+ pInfo->tty = tty;
+ init_waitqueue_head(&pInfo->read_wait);
+ pInfo->priority = R3964_MASTER;
+ pInfo->rx_first = pInfo->rx_last = NULL;
+ pInfo->tx_first = pInfo->tx_last = NULL;
+ pInfo->rx_position = 0;
+ pInfo->tx_position = 0;
+ pInfo->last_rx = 0;
+ pInfo->blocks_in_rx_queue = 0;
+ pInfo->firstClient = NULL;
+ pInfo->state = R3964_IDLE;
+ pInfo->flags = R3964_DEBUG;
+ pInfo->nRetry = 0;
+
+ tty->disc_data = pInfo;
+ tty->receive_room = 65536;
+
+ init_timer(&pInfo->tmr);
+ pInfo->tmr.data = (unsigned long)pInfo;
+ pInfo->tmr.function = on_timeout;
+
+ return 0;
}
static void r3964_close(struct tty_struct *tty)
{
- struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data;
- struct r3964_client_info *pClient, *pNext;
- struct r3964_message *pMsg;
- struct r3964_block_header *pHeader, *pNextHeader;
- unsigned long flags;
-
- TRACE_L("close");
-
- /*
- * Make sure that our task queue isn't activated. If it
- * is, take it out of the linked list.
- */
- del_timer_sync(&pInfo->tmr);
-
- /* Remove client-structs and message queues: */
- pClient=pInfo->firstClient;
- while(pClient)
- {
- pNext=pClient->next;
- while(pClient->msg_count)
- {
- pMsg=remove_msg(pInfo, pClient);
- if(pMsg)
- {
- kfree(pMsg);
- TRACE_M("r3964_close - msg kfree %p",pMsg);
- }
- }
- put_pid(pClient->pid);
- kfree(pClient);
- TRACE_M("r3964_close - client kfree %p",pClient);
- pClient=pNext;
- }
- /* Remove jobs from tx_queue: */
- spin_lock_irqsave(&pInfo->lock, flags);
- pHeader=pInfo->tx_first;
- pInfo->tx_first=pInfo->tx_last=NULL;
+ struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
+ struct r3964_client_info *pClient, *pNext;
+ struct r3964_message *pMsg;
+ struct r3964_block_header *pHeader, *pNextHeader;
+ unsigned long flags;
+
+ TRACE_L("close");
+
+ /*
+ * Make sure that our task queue isn't activated. If it
+ * is, take it out of the linked list.
+ */
+ del_timer_sync(&pInfo->tmr);
+
+ /* Remove client-structs and message queues: */
+ pClient = pInfo->firstClient;
+ while (pClient) {
+ pNext = pClient->next;
+ while (pClient->msg_count) {
+ pMsg = remove_msg(pInfo, pClient);
+ if (pMsg) {
+ kfree(pMsg);
+ TRACE_M("r3964_close - msg kfree %p", pMsg);
+ }
+ }
+ put_pid(pClient->pid);
+ kfree(pClient);
+ TRACE_M("r3964_close - client kfree %p", pClient);
+ pClient = pNext;
+ }
+ /* Remove jobs from tx_queue: */
+ spin_lock_irqsave(&pInfo->lock, flags);
+ pHeader = pInfo->tx_first;
+ pInfo->tx_first = pInfo->tx_last = NULL;
spin_unlock_irqrestore(&pInfo->lock, flags);
-
- while(pHeader)
- {
- pNextHeader=pHeader->next;
- kfree(pHeader);
- pHeader=pNextHeader;
+
+ while (pHeader) {
+ pNextHeader = pHeader->next;
+ kfree(pHeader);
+ pHeader = pNextHeader;
}
- /* Free buffers: */
- wake_up_interruptible(&pInfo->read_wait);
- kfree(pInfo->rx_buf);
- TRACE_M("r3964_close - rx_buf kfree %p",pInfo->rx_buf);
- kfree(pInfo->tx_buf);
- TRACE_M("r3964_close - tx_buf kfree %p",pInfo->tx_buf);
- kfree(pInfo);
- TRACE_M("r3964_close - info kfree %p",pInfo);
+ /* Free buffers: */
+ wake_up_interruptible(&pInfo->read_wait);
+ kfree(pInfo->rx_buf);
+ TRACE_M("r3964_close - rx_buf kfree %p", pInfo->rx_buf);
+ kfree(pInfo->tx_buf);
+ TRACE_M("r3964_close - tx_buf kfree %p", pInfo->tx_buf);
+ kfree(pInfo);
+ TRACE_M("r3964_close - info kfree %p", pInfo);
}
static ssize_t r3964_read(struct tty_struct *tty, struct file *file,
- unsigned char __user *buf, size_t nr)
+ unsigned char __user * buf, size_t nr)
{
- struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data;
- struct r3964_client_info *pClient;
- struct r3964_message *pMsg;
- struct r3964_client_message theMsg;
- DECLARE_WAITQUEUE (wait, current);
-
- int count;
-
- TRACE_L("read()");
-
- pClient=findClient(pInfo, task_pid(current));
- if(pClient)
- {
- pMsg = remove_msg(pInfo, pClient);
- if(pMsg==NULL)
- {
- /* no messages available. */
- if (file->f_flags & O_NONBLOCK)
- {
- return -EAGAIN;
- }
- /* block until there is a message: */
- add_wait_queue(&pInfo->read_wait, &wait);
+ struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
+ struct r3964_client_info *pClient;
+ struct r3964_message *pMsg;
+ struct r3964_client_message theMsg;
+ DECLARE_WAITQUEUE(wait, current);
+
+ int count;
+
+ TRACE_L("read()");
+
+ pClient = findClient(pInfo, task_pid(current));
+ if (pClient) {
+ pMsg = remove_msg(pInfo, pClient);
+ if (pMsg == NULL) {
+ /* no messages available. */
+ if (file->f_flags & O_NONBLOCK) {
+ return -EAGAIN;
+ }
+ /* block until there is a message: */
+ add_wait_queue(&pInfo->read_wait, &wait);
repeat:
- current->state = TASK_INTERRUPTIBLE;
- pMsg = remove_msg(pInfo, pClient);
- if (!pMsg && !signal_pending(current))
- {
- schedule();
- goto repeat;
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&pInfo->read_wait, &wait);
- }
-
- /* If we still haven't got a message, we must have been signalled */
-
- if (!pMsg) return -EINTR;
-
- /* deliver msg to client process: */
- theMsg.msg_id = pMsg->msg_id;
- theMsg.arg = pMsg->arg;
- theMsg.error_code = pMsg->error_code;
- count = sizeof(struct r3964_client_message);
-
- kfree(pMsg);
- TRACE_M("r3964_read - msg kfree %p",pMsg);
-
- if (copy_to_user(buf,&theMsg, count))
- return -EFAULT;
-
- TRACE_PS("read - return %d", count);
- return count;
- }
- return -EPERM;
+ current->state = TASK_INTERRUPTIBLE;
+ pMsg = remove_msg(pInfo, pClient);
+ if (!pMsg && !signal_pending(current)) {
+ schedule();
+ goto repeat;
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&pInfo->read_wait, &wait);
+ }
+
+ /* If we still haven't got a message, we must have been signalled */
+
+ if (!pMsg)
+ return -EINTR;
+
+ /* deliver msg to client process: */
+ theMsg.msg_id = pMsg->msg_id;
+ theMsg.arg = pMsg->arg;
+ theMsg.error_code = pMsg->error_code;
+ count = sizeof(struct r3964_client_message);
+
+ kfree(pMsg);
+ TRACE_M("r3964_read - msg kfree %p", pMsg);
+
+ if (copy_to_user(buf, &theMsg, count))
+ return -EFAULT;
+
+ TRACE_PS("read - return %d", count);
+ return count;
+ }
+ return -EPERM;
}
-static ssize_t r3964_write(struct tty_struct * tty, struct file * file,
+static ssize_t r3964_write(struct tty_struct *tty, struct file *file,
const unsigned char *data, size_t count)
{
- struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data;
- struct r3964_block_header *pHeader;
- struct r3964_client_info *pClient;
- unsigned char *new_data;
-
- TRACE_L("write request, %d characters", count);
+ struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
+ struct r3964_block_header *pHeader;
+ struct r3964_client_info *pClient;
+ unsigned char *new_data;
+
+ TRACE_L("write request, %d characters", count);
/*
* Verify the pointers
*/
- if(!pInfo)
- return -EIO;
+ if (!pInfo)
+ return -EIO;
/*
* Ensure that the caller does not wish to send too much.
*/
- if (count > R3964_MTU)
- {
- if (pInfo->flags & R3964_DEBUG)
- {
- TRACE_L (KERN_WARNING
- "r3964_write: truncating user packet "
- "from %u to mtu %d", count, R3964_MTU);
- }
- count = R3964_MTU;
- }
+ if (count > R3964_MTU) {
+ if (pInfo->flags & R3964_DEBUG) {
+ TRACE_L(KERN_WARNING "r3964_write: truncating user "
+ "packet from %u to mtu %d", count, R3964_MTU);
+ }
+ count = R3964_MTU;
+ }
/*
* Allocate a buffer for the data and copy it from the buffer with header prepended
*/
- new_data = kmalloc (count+sizeof(struct r3964_block_header), GFP_KERNEL);
- TRACE_M("r3964_write - kmalloc %p",new_data);
- if (new_data == NULL) {
- if (pInfo->flags & R3964_DEBUG)
- {
- printk (KERN_ERR
- "r3964_write: no memory\n");
- }
- return -ENOSPC;
- }
-
- pHeader = (struct r3964_block_header *)new_data;
- pHeader->data = new_data + sizeof(struct r3964_block_header);
- pHeader->length = count;
- pHeader->locks = 0;
- pHeader->owner = NULL;
-
- pClient=findClient(pInfo, task_pid(current));
- if(pClient)
- {
- pHeader->owner = pClient;
- }
-
- memcpy(pHeader->data, data, count); /* We already verified this */
-
- if(pInfo->flags & R3964_DEBUG)
- {
- dump_block(pHeader->data, count);
- }
+ new_data = kmalloc(count + sizeof(struct r3964_block_header),
+ GFP_KERNEL);
+ TRACE_M("r3964_write - kmalloc %p", new_data);
+ if (new_data == NULL) {
+ if (pInfo->flags & R3964_DEBUG) {
+ printk(KERN_ERR "r3964_write: no memory\n");
+ }
+ return -ENOSPC;
+ }
+
+ pHeader = (struct r3964_block_header *)new_data;
+ pHeader->data = new_data + sizeof(struct r3964_block_header);
+ pHeader->length = count;
+ pHeader->locks = 0;
+ pHeader->owner = NULL;
+
+ pClient = findClient(pInfo, task_pid(current));
+ if (pClient) {
+ pHeader->owner = pClient;
+ }
+
+ memcpy(pHeader->data, data, count); /* We already verified this */
+
+ if (pInfo->flags & R3964_DEBUG) {
+ dump_block(pHeader->data, count);
+ }
/*
* Add buffer to transmit-queue:
*/
- add_tx_queue(pInfo, pHeader);
- trigger_transmit(pInfo);
-
- return 0;
+ add_tx_queue(pInfo, pHeader);
+ trigger_transmit(pInfo);
+
+ return 0;
}
-static int r3964_ioctl(struct tty_struct * tty, struct file * file,
- unsigned int cmd, unsigned long arg)
+static int r3964_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg)
{
- struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data;
- if(pInfo==NULL)
- return -EINVAL;
- switch(cmd)
- {
- case R3964_ENABLE_SIGNALS:
- return enable_signals(pInfo, task_pid(current), arg);
- case R3964_SETPRIORITY:
- if(arg<R3964_MASTER || arg>R3964_SLAVE)
- return -EINVAL;
- pInfo->priority = arg & 0xff;
- return 0;
- case R3964_USE_BCC:
- if(arg)
- pInfo->flags |= R3964_BCC;
- else
- pInfo->flags &= ~R3964_BCC;
- return 0;
- case R3964_READ_TELEGRAM:
- return read_telegram(pInfo, task_pid(current), (unsigned char __user *)arg);
- default:
- return -ENOIOCTLCMD;
- }
+ struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
+ if (pInfo == NULL)
+ return -EINVAL;
+ switch (cmd) {
+ case R3964_ENABLE_SIGNALS:
+ return enable_signals(pInfo, task_pid(current), arg);
+ case R3964_SETPRIORITY:
+ if (arg < R3964_MASTER || arg > R3964_SLAVE)
+ return -EINVAL;
+ pInfo->priority = arg & 0xff;
+ return 0;
+ case R3964_USE_BCC:
+ if (arg)
+ pInfo->flags |= R3964_BCC;
+ else
+ pInfo->flags &= ~R3964_BCC;
+ return 0;
+ case R3964_READ_TELEGRAM:
+ return read_telegram(pInfo, task_pid(current),
+ (unsigned char __user *)arg);
+ default:
+ return -ENOIOCTLCMD;
+ }
}
-static void r3964_set_termios(struct tty_struct *tty, struct ktermios * old)
+static void r3964_set_termios(struct tty_struct *tty, struct ktermios *old)
{
- TRACE_L("set_termios");
+ TRACE_L("set_termios");
}
/* Called without the kernel lock held - fine */
-static unsigned int r3964_poll(struct tty_struct * tty, struct file * file,
- struct poll_table_struct *wait)
+static unsigned int r3964_poll(struct tty_struct *tty, struct file *file,
+ struct poll_table_struct *wait)
{
- struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data;
- struct r3964_client_info *pClient;
- struct r3964_message *pMsg=NULL;
- unsigned long flags;
- int result = POLLOUT;
-
- TRACE_L("POLL");
-
- pClient=findClient(pInfo, task_pid(current));
- if(pClient)
- {
- poll_wait(file, &pInfo->read_wait, wait);
- spin_lock_irqsave(&pInfo->lock, flags);
- pMsg=pClient->first_msg;
- spin_unlock_irqrestore(&pInfo->lock, flags);
- if(pMsg)
- result |= POLLIN | POLLRDNORM;
- }
- else
- {
- result = -EINVAL;
- }
- return result;
+ struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
+ struct r3964_client_info *pClient;
+ struct r3964_message *pMsg = NULL;
+ unsigned long flags;
+ int result = POLLOUT;
+
+ TRACE_L("POLL");
+
+ pClient = findClient(pInfo, task_pid(current));
+ if (pClient) {
+ poll_wait(file, &pInfo->read_wait, wait);
+ spin_lock_irqsave(&pInfo->lock, flags);
+ pMsg = pClient->first_msg;
+ spin_unlock_irqrestore(&pInfo->lock, flags);
+ if (pMsg)
+ result |= POLLIN | POLLRDNORM;
+ } else {
+ result = -EINVAL;
+ }
+ return result;
}
static void r3964_receive_buf(struct tty_struct *tty, const unsigned char *cp,
- char *fp, int count)
+ char *fp, int count)
{
- struct r3964_info *pInfo=(struct r3964_info*)tty->disc_data;
- const unsigned char *p;
- char *f, flags = 0;
- int i;
-
- for (i=count, p = cp, f = fp; i; i--, p++) {
- if (f)
- flags = *f++;
- if(flags==TTY_NORMAL)
- {
- receive_char(pInfo, *p);
- }
- else
- {
- receive_error(pInfo, flags);
- }
-
- }
+ struct r3964_info *pInfo = (struct r3964_info *)tty->disc_data;
+ const unsigned char *p;
+ char *f, flags = 0;
+ int i;
+
+ for (i = count, p = cp, f = fp; i; i--, p++) {
+ if (f)
+ flags = *f++;
+ if (flags == TTY_NORMAL) {
+ receive_char(pInfo, *p);
+ } else {
+ receive_error(pInfo, flags);
+ }
+
+ }
}
MODULE_LICENSE("GPL");
projects / linux-2.6 / commitdiff