static unsigned int n_tty_poll(struct tty_struct *tty, struct file *file,
poll_table *wait)
{
unsigned int mask = 0;
poll_wait(file, &tty->read_wait, wait);
poll_wait(file, &tty->write_wait, wait);
if (input_available_p(tty, TIME_CHAR(tty) ? 0 : MIN_CHAR(tty)))
mask |= POLLIN | POLLRDNORM;
if (tty->packet && tty->link->ctrl_status)
mask |= POLLPRI | POLLIN | POLLRDNORM;
if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
mask |= POLLHUP;
if (tty_hung_up_p(file))
mask |= POLLHUP;
if (!(mask & (POLLHUP | POLLIN | POLLRDNORM))) {
if (MIN_CHAR(tty) && !TIME_CHAR(tty))
tty->minimum_to_wake = MIN_CHAR(tty);
else
tty->minimum_to_wake = 1;
}
if (tty->ops->write && !tty_is_writelocked(tty) &&
tty_chars_in_buffer(tty) < WAKEUP_CHARS &&
tty_write_room(tty) > 0)
mask |= POLLOUT | POLLWRNORM;
return mask;
}
static ssize_t process_output_block(struct tty_struct *tty,
const unsigned char *buf, unsigned int nr)
{
int space;
int i;
const unsigned char *cp;
mutex_lock(&tty->output_lock);
space = tty_write_room(tty);
if (!space) {
mutex_unlock(&tty->output_lock);
return 0;
}
if (nr > space)
nr = space;
for (i = 0, cp = buf; i < nr; i++, cp++) {
unsigned char c = *cp;
switch (c) {
case '\n':
if (O_ONLRET(tty))
tty->column = 0;
if (O_ONLCR(tty))
goto break_out;
tty->canon_column = tty->column;
break;
case '\r':
if (O_ONOCR(tty) && tty->column == 0)
goto break_out;
if (O_OCRNL(tty))
goto break_out;
tty->canon_column = tty->column = 0;
break;
case '\t':
goto break_out;
case '\b':
if (tty->column > 0)
tty->column--;
break;
default:
if (!iscntrl(c)) {
if (O_OLCUC(tty))
goto break_out;
if (!is_continuation(c, tty))
tty->column++;
}
break;
}
}
break_out:
i = tty->ops->write(tty, buf, i);
mutex_unlock(&tty->output_lock);
return i;
}
const char *spk_ttyio_synth_immediate(struct spk_synth *synth, const char *buff)
{
u_char ch;
while ((ch = *buff)) {
if (ch == '\n')
ch = synth->procspeech;
if (tty_write_room(speakup_tty) < 1 || !synth->io_ops->synth_out(synth, ch))
return buff;
buff++;
}
return NULL;
}
static int process_output(unsigned char c, struct tty_struct *tty)
{
int space, retval;
mutex_lock(&tty->output_lock);
space = tty_write_room(tty);
retval = do_output_char(c, tty, space);
mutex_unlock(&tty->output_lock);
if (retval < 0)
return -1;
else
return 0;
}
int es705_uart_write(struct es705_priv *es705, const void *buf, int len)
{
int rc = 0;
int count_remain = len;
int bytes_wr = 0;
mm_segment_t oldfs;
loff_t pos = 0;
dev_dbg(es705->dev, "%s(): size %d\n", __func__, len);
/*
* we may call from user context via char dev, so allow
* read buffer in kernel address space
*/
oldfs = get_fs();
set_fs(KERNEL_DS);
while (count_remain > 0) {
/* block until tx buffer space is available */
while (tty_write_room(es705->uart_dev.tty) < UART_TTY_WRITE_SZ)
usleep_range(2000, 2000);
rc = vfs_write(es705->uart_dev.file, buf + bytes_wr,
min(UART_TTY_WRITE_SZ, count_remain), &pos);
if (rc < 0) {
bytes_wr = rc;
goto err_out;
}
bytes_wr += rc;
count_remain -= rc;
}
err_out:
/* restore old fs context */
set_fs(oldfs);
dev_dbg(es705->dev, "%s(): write bytes %d\n", __func__, bytes_wr);
return bytes_wr;
}
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;
}
room = tty_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 int ld_pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ld_phonet *ld_pn;
u8 *ptr;
BUG_ON(dev == NULL);
ld_pn = netdev_priv(dev);
/* Add special Pattern before each ISI message */
ptr = skb_push(skb, 6);
ptr[0] = 0xdd;
ptr[1] = 0x7f;
ptr[2] = 0x21;
ptr[3] = 0x9a;
ptr[4] = skb->data[10];
ptr[5] = skb->data[11];
if (ld_pn->link_up == true) {
skb_queue_tail(&ld_pn->head, skb);
return ld_pn_handle_tx(ld_pn);
} else {
if (tty_write_room(ld_pn->tty)) {
/* link is up again */
ld_pn->link_up = true;
ld_pn->nb_try_to_tx = 0;
skb_queue_tail(&ld_pn->head, skb);
return ld_pn_handle_tx(ld_pn);
} else {
if (in_interrupt())
dev_kfree_skb_irq(skb);
else
kfree_skb(skb);
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
}
}
static void process_echoes(struct tty_struct *tty)
{
int space, nr;
unsigned char c;
unsigned char *cp, *buf_end;
if (!tty->echo_cnt)
return;
mutex_lock(&tty->output_lock);
mutex_lock(&tty->echo_lock);
space = tty_write_room(tty);
buf_end = tty->echo_buf + N_TTY_BUF_SIZE;
cp = tty->echo_buf + tty->echo_pos;
nr = tty->echo_cnt;
while (nr > 0) {
c = *cp;
if (c == ECHO_OP_START) {
unsigned char op;
unsigned char *opp;
int no_space_left = 0;
opp = cp + 1;
if (opp == buf_end)
opp -= N_TTY_BUF_SIZE;
op = *opp;
switch (op) {
unsigned int num_chars, num_bs;
case ECHO_OP_ERASE_TAB:
if (++opp == buf_end)
opp -= N_TTY_BUF_SIZE;
num_chars = *opp;
if (!(num_chars & 0x80))
num_chars += tty->canon_column;
num_bs = 8 - (num_chars & 7);
if (num_bs > space) {
no_space_left = 1;
break;
}
space -= num_bs;
while (num_bs--) {
tty_put_char(tty, '\b');
if (tty->column > 0)
tty->column--;
}
cp += 3;
nr -= 3;
break;
case ECHO_OP_SET_CANON_COL:
tty->canon_column = tty->column;
cp += 2;
nr -= 2;
break;
case ECHO_OP_MOVE_BACK_COL:
if (tty->column > 0)
tty->column--;
cp += 2;
nr -= 2;
break;
case ECHO_OP_START:
if (!space) {
no_space_left = 1;
break;
}
tty_put_char(tty, ECHO_OP_START);
tty->column++;
space--;
cp += 2;
nr -= 2;
break;
default:
if (space < 2) {
no_space_left = 1;
break;
}
tty_put_char(tty, '^');
tty_put_char(tty, op ^ 0100);
tty->column += 2;
space -= 2;
cp += 2;
nr -= 2;
}
if (no_space_left)
break;
} else {
if (O_OPOST(tty) &&
!(test_bit(TTY_HW_COOK_OUT, &tty->flags))) {
int retval = do_output_char(c, tty, space);
if (retval < 0)
break;
space -= retval;
} else {
if (!space)
break;
tty_put_char(tty, c);
space -= 1;
}
cp += 1;
nr -= 1;
}
if (cp >= buf_end)
cp -= N_TTY_BUF_SIZE;
}
if (nr == 0) {
tty->echo_pos = 0;
tty->echo_cnt = 0;
tty->echo_overrun = 0;
} else {
int num_processed = tty->echo_cnt - nr;
tty->echo_pos += num_processed;
tty->echo_pos &= N_TTY_BUF_SIZE - 1;
tty->echo_cnt = nr;
if (num_processed > 0)
tty->echo_overrun = 0;
}
mutex_unlock(&tty->echo_lock);
mutex_unlock(&tty->output_lock);
if (tty->ops->flush_chars)
tty->ops->flush_chars(tty);
}
static int ld_pn_handle_tx(struct ld_phonet *ld_pn)
{
struct tty_struct *tty = ld_pn->tty;
struct sk_buff *skb;
int tty_wr, len, room, i;
PN_PRINTK("Write Data in tty\n");
if (tty == NULL)
return 0;
/* Enter critical section */
if (test_and_set_bit(PHONET_SENDING, &ld_pn->state))
return 0;
/* skb_peek is safe because handle_tx is called after skb_queue_tail */
while ((skb = skb_peek(&ld_pn->head)) != NULL) {
/* Make sure you don't write too much */
len = skb->len;
room = tty_write_room(tty);
if (!room) {
if (ld_pn->nb_try_to_tx++ > 40) {
ld_pn->link_up = false;
/* Flush TX queue */
while ((skb = \
skb_dequeue(&ld_pn->head)) != NULL) {
skb->dev->stats.tx_dropped++;
if (in_interrupt())
dev_kfree_skb_irq(skb);
else
kfree_skb(skb);
}
}
break;
}
/* Get room => reset nb_try_to_tx counter */
ld_pn->nb_try_to_tx = 0;
if (room > MAX_WRITE_CHUNK)
room = MAX_WRITE_CHUNK;
if (len > room)
len = room;
tty_wr = tty->ops->write(tty, skb->data, len);
ld_pn->dev->stats.tx_packets++;
ld_pn->dev->stats.tx_bytes += tty_wr;
PN_DATA_PRINTK("PHONET: write data in tty\n");
for (i = 1; i <= len; i++) {
PN_DATA_PRINTK(" %02x", skb->data[i-1]);
if ((i%8) == 0)
PN_DATA_PRINTK("\n");
}
PN_DATA_PRINTK("\n");
/* Error on TTY ?! */
if (tty_wr < 0)
goto error;
/* Reduce buffer written, and discard if empty */
skb_pull(skb, tty_wr);
if (skb->len == 0) {
struct sk_buff *tmp = skb_dequeue(&ld_pn->head);
BUG_ON(tmp != skb);
if (in_interrupt())
dev_kfree_skb_irq(skb);
else
kfree_skb(skb);
}
}
/* Send flow off if queue is empty */
clear_bit(PHONET_SENDING, &ld_pn->state);
return 0;
error:
clear_bit(PHONET_SENDING, &ld_pn->state);
return tty_wr;
}