/* internal functions */
static void send_ll_cmd(unsigned char cmd)
{
ST_LL_DBG("%s: writing %x", __func__, cmd);
st_int_write(&cmd, 1);
return;
}
/* internal functions */
static void send_ll_cmd(struct st_data_s *st_data,
unsigned char cmd)
{
pr_debug("%s: writing %x", __func__, cmd);
st_int_write(st_data, &cmd, 1);
return;
}
/*
* internal wakeup function
* called from either
* - TTY layer when write's finished
* - st_write (in context of the protocol stack)
*/
void st_tx_wakeup(struct st_data_s *st_data)
{
struct sk_buff *skb;
unsigned long flags; /* for irq save flags */
pr_debug("%s", __func__);
/* check for sending & set flag sending here */
if (test_and_set_bit(ST_TX_SENDING, &st_data->tx_state)) {
pr_debug("ST already sending");
/* keep sending */
set_bit(ST_TX_WAKEUP, &st_data->tx_state);
return;
/* TX_WAKEUP will be checked in another
* context
*/
}
pm_runtime_get_sync(st_data->tty_dev);
do { /* come back if st_tx_wakeup is set */
/* woke-up to write */
clear_bit(ST_TX_WAKEUP, &st_data->tx_state);
while ((skb = st_int_dequeue(st_data))) {
int len;
spin_lock_irqsave(&st_data->lock, flags);
/* enable wake-up from TTY */
set_bit(TTY_DO_WRITE_WAKEUP, &st_data->tty->flags);
len = st_int_write(st_data, skb->data, skb->len);
skb_pull(skb, len);
/* if skb->len = len as expected, skb->len=0 */
if (skb->len) {
/* would be the next skb to be sent */
st_data->tx_skb = skb;
spin_unlock_irqrestore(&st_data->lock, flags);
break;
}
kfree_skb(skb);
spin_unlock_irqrestore(&st_data->lock, flags);
}
/* if wake-up is set in another context- restart sending */
} while (test_bit(ST_TX_WAKEUP, &st_data->tx_state));
pm_runtime_put(st_data->tty_dev);
/* clear flag sending */
clear_bit(ST_TX_SENDING, &st_data->tx_state);
}