#include "sir-dev.h"
-
-static struct workqueue_struct *irda_sir_wq;
-
-/* STATE MACHINE */
-
-/* substate handler of the config-fsm to handle the cases where we want
- * to wait for transmit completion before changing the port configuration
- */
-
-static int sirdev_tx_complete_fsm(struct sir_dev *dev)
-{
- struct sir_fsm *fsm = &dev->fsm;
- unsigned next_state, delay;
- unsigned bytes_left;
-
- do {
- next_state = fsm->substate; /* default: stay in current substate */
- delay = 0;
-
- switch(fsm->substate) {
-
- case SIRDEV_STATE_WAIT_XMIT:
- if (dev->drv->chars_in_buffer)
- bytes_left = dev->drv->chars_in_buffer(dev);
- else
- bytes_left = 0;
- if (!bytes_left) {
- next_state = SIRDEV_STATE_WAIT_UNTIL_SENT;
- break;
- }
-
- if (dev->speed > 115200)
- delay = (bytes_left*8*10000) / (dev->speed/100);
- else if (dev->speed > 0)
- delay = (bytes_left*10*10000) / (dev->speed/100);
- else
- delay = 0;
- /* expected delay (usec) until remaining bytes are sent */
- if (delay < 100) {
- udelay(delay);
- delay = 0;
- break;
- }
- /* sleep some longer delay (msec) */
- delay = (delay+999) / 1000;
- break;
-
- case SIRDEV_STATE_WAIT_UNTIL_SENT:
- /* block until underlaying hardware buffer are empty */
- if (dev->drv->wait_until_sent)
- dev->drv->wait_until_sent(dev);
- next_state = SIRDEV_STATE_TX_DONE;
- break;
-
- case SIRDEV_STATE_TX_DONE:
- return 0;
-
- default:
- IRDA_ERROR("%s - undefined state\n", __FUNCTION__);
- return -EINVAL;
- }
- fsm->substate = next_state;
- } while (delay == 0);
- return delay;
-}
-
-/*
- * Function sirdev_config_fsm
- *
- * State machine to handle the configuration of the device (and attached dongle, if any).
- * This handler is scheduled for execution in kIrDAd context, so we can sleep.
- * however, kIrDAd is shared by all sir_dev devices so we better don't sleep there too
- * long. Instead, for longer delays we start a timer to reschedule us later.
- * On entry, fsm->sem is always locked and the netdev xmit queue stopped.
- * Both must be unlocked/restarted on completion - but only on final exit.
- */
-
-static void sirdev_config_fsm(void *data)
-{
- struct sir_dev *dev = data;
- struct sir_fsm *fsm = &dev->fsm;
- int next_state;
- int ret = -1;
- unsigned delay;
-
- IRDA_DEBUG(2, "%s(), <%ld>\n", __FUNCTION__, jiffies);
-
- do {
- IRDA_DEBUG(3, "%s - state=0x%04x / substate=0x%04x\n",
- __FUNCTION__, fsm->state, fsm->substate);
-
- next_state = fsm->state;
- delay = 0;
-
- switch(fsm->state) {
-
- case SIRDEV_STATE_DONGLE_OPEN:
- if (dev->dongle_drv != NULL) {
- ret = sirdev_put_dongle(dev);
- if (ret) {
- fsm->result = -EINVAL;
- next_state = SIRDEV_STATE_ERROR;
- break;
- }
- }
-
- /* Initialize dongle */
- ret = sirdev_get_dongle(dev, fsm->param);
- if (ret) {
- fsm->result = ret;
- next_state = SIRDEV_STATE_ERROR;
- break;
- }
-
- /* Dongles are powered through the modem control lines which
- * were just set during open. Before resetting, let's wait for
- * the power to stabilize. This is what some dongle drivers did
- * in open before, while others didn't - should be safe anyway.
- */
-
- delay = 50;
- fsm->substate = SIRDEV_STATE_DONGLE_RESET;
- next_state = SIRDEV_STATE_DONGLE_RESET;
-
- fsm->param = 9600;
-
- break;
-
- case SIRDEV_STATE_DONGLE_CLOSE:
- /* shouldn't we just treat this as success=? */
- if (dev->dongle_drv == NULL) {
- fsm->result = -EINVAL;
- next_state = SIRDEV_STATE_ERROR;
- break;
- }
-
- ret = sirdev_put_dongle(dev);
- if (ret) {
- fsm->result = ret;
- next_state = SIRDEV_STATE_ERROR;
- break;
- }
- next_state = SIRDEV_STATE_DONE;
- break;
-
- case SIRDEV_STATE_SET_DTR_RTS:
- ret = sirdev_set_dtr_rts(dev,
- (fsm->param&0x02) ? TRUE : FALSE,
- (fsm->param&0x01) ? TRUE : FALSE);
- next_state = SIRDEV_STATE_DONE;
- break;
-
- case SIRDEV_STATE_SET_SPEED:
- fsm->substate = SIRDEV_STATE_WAIT_XMIT;
- next_state = SIRDEV_STATE_DONGLE_CHECK;
- break;
-
- case SIRDEV_STATE_DONGLE_CHECK:
- ret = sirdev_tx_complete_fsm(dev);
- if (ret < 0) {
- fsm->result = ret;
- next_state = SIRDEV_STATE_ERROR;
- break;
- }
- if ((delay=ret) != 0)
- break;
-
- if (dev->dongle_drv) {
- fsm->substate = SIRDEV_STATE_DONGLE_RESET;
- next_state = SIRDEV_STATE_DONGLE_RESET;
- }
- else {
- dev->speed = fsm->param;
- next_state = SIRDEV_STATE_PORT_SPEED;
- }
- break;
-
- case SIRDEV_STATE_DONGLE_RESET:
- if (dev->dongle_drv->reset) {
- ret = dev->dongle_drv->reset(dev);
- if (ret < 0) {
- fsm->result = ret;
- next_state = SIRDEV_STATE_ERROR;
- break;
- }
- }
- else
- ret = 0;
- if ((delay=ret) == 0) {
- /* set serial port according to dongle default speed */
- if (dev->drv->set_speed)
- dev->drv->set_speed(dev, dev->speed);
- fsm->substate = SIRDEV_STATE_DONGLE_SPEED;
- next_state = SIRDEV_STATE_DONGLE_SPEED;
- }
- break;
-
- case SIRDEV_STATE_DONGLE_SPEED:
- if (dev->dongle_drv->reset) {
- ret = dev->dongle_drv->set_speed(dev, fsm->param);
- if (ret < 0) {
- fsm->result = ret;
- next_state = SIRDEV_STATE_ERROR;
- break;
- }
- }
- else
- ret = 0;
- if ((delay=ret) == 0)
- next_state = SIRDEV_STATE_PORT_SPEED;
- break;
-
- case SIRDEV_STATE_PORT_SPEED:
- /* Finally we are ready to change the serial port speed */
- if (dev->drv->set_speed)
- dev->drv->set_speed(dev, dev->speed);
- dev->new_speed = 0;
- next_state = SIRDEV_STATE_DONE;
- break;
-
- case SIRDEV_STATE_DONE:
- /* Signal network layer so it can send more frames */
- netif_wake_queue(dev->netdev);
- next_state = SIRDEV_STATE_COMPLETE;
- break;
-
- default:
- IRDA_ERROR("%s - undefined state\n", __FUNCTION__);
- fsm->result = -EINVAL;
- /* fall thru */
-
- case SIRDEV_STATE_ERROR:
- IRDA_ERROR("%s - error: %d\n", __FUNCTION__, fsm->result);
-
-#if 0 /* don't enable this before we have netdev->tx_timeout to recover */
- netif_stop_queue(dev->netdev);
-#else
- netif_wake_queue(dev->netdev);
-#endif
- /* fall thru */
-
- case SIRDEV_STATE_COMPLETE:
- /* config change finished, so we are not busy any longer */
- sirdev_enable_rx(dev);
- up(&fsm->sem);
- return;
- }
- fsm->state = next_state;
- } while(!delay);
-
- queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay));
-}
-
-/* schedule some device configuration task for execution by kIrDAd
- * on behalf of the above state machine.
- * can be called from process or interrupt/tasklet context.
- */
-
-int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param)
-{
- struct sir_fsm *fsm = &dev->fsm;
-
- IRDA_DEBUG(2, "%s - state=0x%04x / param=%u\n", __FUNCTION__, initial_state, param);
-
- if (down_trylock(&fsm->sem)) {
- if (in_interrupt() || in_atomic() || irqs_disabled()) {
- IRDA_DEBUG(1, "%s(), state machine busy!\n", __FUNCTION__);
- return -EWOULDBLOCK;
- } else
- down(&fsm->sem);
- }
-
- if (fsm->state == SIRDEV_STATE_DEAD) {
- /* race with sirdev_close should never happen */
- IRDA_ERROR("%s(), instance staled!\n", __FUNCTION__);
- up(&fsm->sem);
- return -ESTALE; /* or better EPIPE? */
- }
-
- netif_stop_queue(dev->netdev);
- atomic_set(&dev->enable_rx, 0);
-
- fsm->state = initial_state;
- fsm->param = param;
- fsm->result = 0;
-
- INIT_WORK(&fsm->work, sirdev_config_fsm, dev);
- queue_work(irda_sir_wq, &fsm->work);
- return 0;
-}
-
-
/***************************************************************************/
void sirdev_enable_rx(struct sir_dev *dev)
spin_lock_init(&dev->tx_lock);
init_MUTEX(&dev->fsm.sem);
+ INIT_LIST_HEAD(&dev->fsm.rq.lh_request);
+ dev->fsm.rq.pending = 0;
+ init_timer(&dev->fsm.rq.timer);
+
dev->drv = drv;
dev->netdev = ndev;
}
EXPORT_SYMBOL(sirdev_put_instance);
-static int __init sir_wq_init(void)
-{
- irda_sir_wq = create_singlethread_workqueue("irda_sir_wq");
- if (!irda_sir_wq)
- return -ENOMEM;
- return 0;
-}
-
-static void __exit sir_wq_exit(void)
-{
- destroy_workqueue(irda_sir_wq);
-}
-
-module_init(sir_wq_init);
-module_exit(sir_wq_exit);
-
-MODULE_AUTHOR("Martin Diehl <info@mdiehl.de>");
-MODULE_DESCRIPTION("IrDA SIR core");
-MODULE_LICENSE("GPL");
git://git.onelab.eu / linux-2.6.git / blobdiff