![Harvey Harrison](/assets/img/avatar_default.png)
__FUNCTION__ is gcc-specific, use __func__ Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
990 lines
24 KiB
C
990 lines
24 KiB
C
/*********************************************************************
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*
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* sir_dev.c: irda sir network device
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*
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* Copyright (c) 2002 Martin Diehl
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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********************************************************************/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <net/irda/irda.h>
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#include <net/irda/wrapper.h>
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#include <net/irda/irda_device.h>
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#include "sir-dev.h"
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static struct workqueue_struct *irda_sir_wq;
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/* STATE MACHINE */
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/* substate handler of the config-fsm to handle the cases where we want
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* to wait for transmit completion before changing the port configuration
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*/
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static int sirdev_tx_complete_fsm(struct sir_dev *dev)
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{
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struct sir_fsm *fsm = &dev->fsm;
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unsigned next_state, delay;
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unsigned bytes_left;
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do {
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next_state = fsm->substate; /* default: stay in current substate */
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delay = 0;
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switch(fsm->substate) {
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case SIRDEV_STATE_WAIT_XMIT:
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if (dev->drv->chars_in_buffer)
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bytes_left = dev->drv->chars_in_buffer(dev);
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else
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bytes_left = 0;
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if (!bytes_left) {
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next_state = SIRDEV_STATE_WAIT_UNTIL_SENT;
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break;
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}
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if (dev->speed > 115200)
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delay = (bytes_left*8*10000) / (dev->speed/100);
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else if (dev->speed > 0)
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delay = (bytes_left*10*10000) / (dev->speed/100);
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else
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delay = 0;
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/* expected delay (usec) until remaining bytes are sent */
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if (delay < 100) {
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udelay(delay);
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delay = 0;
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break;
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}
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/* sleep some longer delay (msec) */
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delay = (delay+999) / 1000;
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break;
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case SIRDEV_STATE_WAIT_UNTIL_SENT:
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/* block until underlaying hardware buffer are empty */
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if (dev->drv->wait_until_sent)
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dev->drv->wait_until_sent(dev);
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next_state = SIRDEV_STATE_TX_DONE;
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break;
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case SIRDEV_STATE_TX_DONE:
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return 0;
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default:
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IRDA_ERROR("%s - undefined state\n", __func__);
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return -EINVAL;
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}
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fsm->substate = next_state;
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} while (delay == 0);
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return delay;
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}
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/*
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* Function sirdev_config_fsm
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*
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* State machine to handle the configuration of the device (and attached dongle, if any).
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* This handler is scheduled for execution in kIrDAd context, so we can sleep.
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* however, kIrDAd is shared by all sir_dev devices so we better don't sleep there too
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* long. Instead, for longer delays we start a timer to reschedule us later.
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* On entry, fsm->sem is always locked and the netdev xmit queue stopped.
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* Both must be unlocked/restarted on completion - but only on final exit.
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*/
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static void sirdev_config_fsm(struct work_struct *work)
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{
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struct sir_dev *dev = container_of(work, struct sir_dev, fsm.work.work);
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struct sir_fsm *fsm = &dev->fsm;
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int next_state;
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int ret = -1;
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unsigned delay;
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IRDA_DEBUG(2, "%s(), <%ld>\n", __func__, jiffies);
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do {
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IRDA_DEBUG(3, "%s - state=0x%04x / substate=0x%04x\n",
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__func__, fsm->state, fsm->substate);
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next_state = fsm->state;
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delay = 0;
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switch(fsm->state) {
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case SIRDEV_STATE_DONGLE_OPEN:
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if (dev->dongle_drv != NULL) {
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ret = sirdev_put_dongle(dev);
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if (ret) {
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fsm->result = -EINVAL;
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next_state = SIRDEV_STATE_ERROR;
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break;
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}
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}
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/* Initialize dongle */
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ret = sirdev_get_dongle(dev, fsm->param);
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if (ret) {
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fsm->result = ret;
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next_state = SIRDEV_STATE_ERROR;
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break;
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}
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/* Dongles are powered through the modem control lines which
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* were just set during open. Before resetting, let's wait for
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* the power to stabilize. This is what some dongle drivers did
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* in open before, while others didn't - should be safe anyway.
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*/
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delay = 50;
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fsm->substate = SIRDEV_STATE_DONGLE_RESET;
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next_state = SIRDEV_STATE_DONGLE_RESET;
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fsm->param = 9600;
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break;
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case SIRDEV_STATE_DONGLE_CLOSE:
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/* shouldn't we just treat this as success=? */
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if (dev->dongle_drv == NULL) {
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fsm->result = -EINVAL;
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next_state = SIRDEV_STATE_ERROR;
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break;
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}
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ret = sirdev_put_dongle(dev);
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if (ret) {
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fsm->result = ret;
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next_state = SIRDEV_STATE_ERROR;
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break;
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}
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next_state = SIRDEV_STATE_DONE;
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break;
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case SIRDEV_STATE_SET_DTR_RTS:
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ret = sirdev_set_dtr_rts(dev,
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(fsm->param&0x02) ? TRUE : FALSE,
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(fsm->param&0x01) ? TRUE : FALSE);
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next_state = SIRDEV_STATE_DONE;
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break;
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case SIRDEV_STATE_SET_SPEED:
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fsm->substate = SIRDEV_STATE_WAIT_XMIT;
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next_state = SIRDEV_STATE_DONGLE_CHECK;
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break;
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case SIRDEV_STATE_DONGLE_CHECK:
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ret = sirdev_tx_complete_fsm(dev);
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if (ret < 0) {
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fsm->result = ret;
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next_state = SIRDEV_STATE_ERROR;
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break;
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}
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if ((delay=ret) != 0)
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break;
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if (dev->dongle_drv) {
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fsm->substate = SIRDEV_STATE_DONGLE_RESET;
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next_state = SIRDEV_STATE_DONGLE_RESET;
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}
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else {
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dev->speed = fsm->param;
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next_state = SIRDEV_STATE_PORT_SPEED;
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}
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break;
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case SIRDEV_STATE_DONGLE_RESET:
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if (dev->dongle_drv->reset) {
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ret = dev->dongle_drv->reset(dev);
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if (ret < 0) {
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fsm->result = ret;
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next_state = SIRDEV_STATE_ERROR;
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break;
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}
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}
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else
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ret = 0;
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if ((delay=ret) == 0) {
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/* set serial port according to dongle default speed */
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if (dev->drv->set_speed)
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dev->drv->set_speed(dev, dev->speed);
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fsm->substate = SIRDEV_STATE_DONGLE_SPEED;
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next_state = SIRDEV_STATE_DONGLE_SPEED;
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}
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break;
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case SIRDEV_STATE_DONGLE_SPEED:
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if (dev->dongle_drv->reset) {
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ret = dev->dongle_drv->set_speed(dev, fsm->param);
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if (ret < 0) {
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fsm->result = ret;
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next_state = SIRDEV_STATE_ERROR;
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break;
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}
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}
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else
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ret = 0;
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if ((delay=ret) == 0)
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next_state = SIRDEV_STATE_PORT_SPEED;
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break;
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case SIRDEV_STATE_PORT_SPEED:
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/* Finally we are ready to change the serial port speed */
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if (dev->drv->set_speed)
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dev->drv->set_speed(dev, dev->speed);
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dev->new_speed = 0;
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next_state = SIRDEV_STATE_DONE;
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break;
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case SIRDEV_STATE_DONE:
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/* Signal network layer so it can send more frames */
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netif_wake_queue(dev->netdev);
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next_state = SIRDEV_STATE_COMPLETE;
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break;
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default:
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IRDA_ERROR("%s - undefined state\n", __func__);
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fsm->result = -EINVAL;
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/* fall thru */
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case SIRDEV_STATE_ERROR:
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IRDA_ERROR("%s - error: %d\n", __func__, fsm->result);
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#if 0 /* don't enable this before we have netdev->tx_timeout to recover */
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netif_stop_queue(dev->netdev);
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#else
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netif_wake_queue(dev->netdev);
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#endif
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/* fall thru */
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case SIRDEV_STATE_COMPLETE:
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/* config change finished, so we are not busy any longer */
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sirdev_enable_rx(dev);
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up(&fsm->sem);
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return;
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}
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fsm->state = next_state;
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} while(!delay);
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queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay));
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}
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/* schedule some device configuration task for execution by kIrDAd
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* on behalf of the above state machine.
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* can be called from process or interrupt/tasklet context.
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*/
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int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param)
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{
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struct sir_fsm *fsm = &dev->fsm;
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IRDA_DEBUG(2, "%s - state=0x%04x / param=%u\n", __func__,
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initial_state, param);
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if (down_trylock(&fsm->sem)) {
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if (in_interrupt() || in_atomic() || irqs_disabled()) {
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IRDA_DEBUG(1, "%s(), state machine busy!\n", __func__);
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return -EWOULDBLOCK;
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} else
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down(&fsm->sem);
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}
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if (fsm->state == SIRDEV_STATE_DEAD) {
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/* race with sirdev_close should never happen */
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IRDA_ERROR("%s(), instance staled!\n", __func__);
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up(&fsm->sem);
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return -ESTALE; /* or better EPIPE? */
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}
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netif_stop_queue(dev->netdev);
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atomic_set(&dev->enable_rx, 0);
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fsm->state = initial_state;
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fsm->param = param;
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fsm->result = 0;
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INIT_DELAYED_WORK(&fsm->work, sirdev_config_fsm);
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queue_delayed_work(irda_sir_wq, &fsm->work, 0);
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return 0;
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}
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/***************************************************************************/
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void sirdev_enable_rx(struct sir_dev *dev)
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{
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if (unlikely(atomic_read(&dev->enable_rx)))
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return;
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/* flush rx-buffer - should also help in case of problems with echo cancelation */
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dev->rx_buff.data = dev->rx_buff.head;
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dev->rx_buff.len = 0;
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dev->rx_buff.in_frame = FALSE;
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dev->rx_buff.state = OUTSIDE_FRAME;
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atomic_set(&dev->enable_rx, 1);
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}
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static int sirdev_is_receiving(struct sir_dev *dev)
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{
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if (!atomic_read(&dev->enable_rx))
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return 0;
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return (dev->rx_buff.state != OUTSIDE_FRAME);
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}
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int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
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{
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int err;
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IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __func__, type);
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err = sirdev_schedule_dongle_open(dev, type);
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if (unlikely(err))
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return err;
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down(&dev->fsm.sem); /* block until config change completed */
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err = dev->fsm.result;
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up(&dev->fsm.sem);
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return err;
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}
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EXPORT_SYMBOL(sirdev_set_dongle);
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/* used by dongle drivers for dongle programming */
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int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
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{
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unsigned long flags;
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int ret;
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if (unlikely(len > dev->tx_buff.truesize))
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return -ENOSPC;
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spin_lock_irqsave(&dev->tx_lock, flags); /* serialize with other tx operations */
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while (dev->tx_buff.len > 0) { /* wait until tx idle */
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spin_unlock_irqrestore(&dev->tx_lock, flags);
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msleep(10);
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spin_lock_irqsave(&dev->tx_lock, flags);
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}
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dev->tx_buff.data = dev->tx_buff.head;
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memcpy(dev->tx_buff.data, buf, len);
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dev->tx_buff.len = len;
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ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
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if (ret > 0) {
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IRDA_DEBUG(3, "%s(), raw-tx started\n", __func__);
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dev->tx_buff.data += ret;
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dev->tx_buff.len -= ret;
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dev->raw_tx = 1;
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ret = len; /* all data is going to be sent */
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}
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spin_unlock_irqrestore(&dev->tx_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(sirdev_raw_write);
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/* seems some dongle drivers may need this */
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int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
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{
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int count;
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if (atomic_read(&dev->enable_rx))
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return -EIO; /* fail if we expect irda-frames */
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count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
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if (count > 0) {
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memcpy(buf, dev->rx_buff.data, count);
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dev->rx_buff.data += count;
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dev->rx_buff.len -= count;
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}
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/* remaining stuff gets flushed when re-enabling normal rx */
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return count;
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}
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EXPORT_SYMBOL(sirdev_raw_read);
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int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
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{
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int ret = -ENXIO;
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if (dev->drv->set_dtr_rts)
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ret = dev->drv->set_dtr_rts(dev, dtr, rts);
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return ret;
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}
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EXPORT_SYMBOL(sirdev_set_dtr_rts);
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/**********************************************************************/
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/* called from client driver - likely with bh-context - to indicate
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* it made some progress with transmission. Hence we send the next
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* chunk, if any, or complete the skb otherwise
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*/
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void sirdev_write_complete(struct sir_dev *dev)
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{
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unsigned long flags;
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struct sk_buff *skb;
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int actual = 0;
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int err;
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spin_lock_irqsave(&dev->tx_lock, flags);
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IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
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__func__, dev->tx_buff.len);
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if (likely(dev->tx_buff.len > 0)) {
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/* Write data left in transmit buffer */
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actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
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if (likely(actual>0)) {
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dev->tx_buff.data += actual;
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dev->tx_buff.len -= actual;
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}
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else if (unlikely(actual<0)) {
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/* could be dropped later when we have tx_timeout to recover */
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IRDA_ERROR("%s: drv->do_write failed (%d)\n",
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__func__, actual);
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if ((skb=dev->tx_skb) != NULL) {
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dev->tx_skb = NULL;
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dev_kfree_skb_any(skb);
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dev->stats.tx_errors++;
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dev->stats.tx_dropped++;
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}
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dev->tx_buff.len = 0;
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}
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if (dev->tx_buff.len > 0)
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goto done; /* more data to send later */
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}
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if (unlikely(dev->raw_tx != 0)) {
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/* in raw mode we are just done now after the buffer was sent
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* completely. Since this was requested by some dongle driver
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* running under the control of the irda-thread we must take
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* care here not to re-enable the queue. The queue will be
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* restarted when the irda-thread has completed the request.
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*/
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IRDA_DEBUG(3, "%s(), raw-tx done\n", __func__);
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dev->raw_tx = 0;
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goto done; /* no post-frame handling in raw mode */
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}
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/* we have finished now sending this skb.
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* update statistics and free the skb.
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* finally we check and trigger a pending speed change, if any.
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* if not we switch to rx mode and wake the queue for further
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* packets.
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* note the scheduled speed request blocks until the lower
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* client driver and the corresponding hardware has really
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* finished sending all data (xmit fifo drained f.e.)
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* before the speed change gets finally done and the queue
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* re-activated.
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*/
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IRDA_DEBUG(5, "%s(), finished with frame!\n", __func__);
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if ((skb=dev->tx_skb) != NULL) {
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dev->tx_skb = NULL;
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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dev_kfree_skb_any(skb);
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}
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if (unlikely(dev->new_speed > 0)) {
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IRDA_DEBUG(5, "%s(), Changing speed!\n", __func__);
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err = sirdev_schedule_speed(dev, dev->new_speed);
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if (unlikely(err)) {
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/* should never happen
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* forget the speed change and hope the stack recovers
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*/
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IRDA_ERROR("%s - schedule speed change failed: %d\n",
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__func__, err);
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netif_wake_queue(dev->netdev);
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}
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/* else: success
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* speed change in progress now
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* on completion dev->new_speed gets cleared,
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* rx-reenabled and the queue restarted
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*/
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}
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else {
|
|
sirdev_enable_rx(dev);
|
|
netif_wake_queue(dev->netdev);
|
|
}
|
|
|
|
done:
|
|
spin_unlock_irqrestore(&dev->tx_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(sirdev_write_complete);
|
|
|
|
/* called from client driver - likely with bh-context - to give us
|
|
* some more received bytes. We put them into the rx-buffer,
|
|
* normally unwrapping and building LAP-skb's (unless rx disabled)
|
|
*/
|
|
|
|
int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count)
|
|
{
|
|
if (!dev || !dev->netdev) {
|
|
IRDA_WARNING("%s(), not ready yet!\n", __func__);
|
|
return -1;
|
|
}
|
|
|
|
if (!dev->irlap) {
|
|
IRDA_WARNING("%s - too early: %p / %zd!\n",
|
|
__func__, cp, count);
|
|
return -1;
|
|
}
|
|
|
|
if (cp==NULL) {
|
|
/* error already at lower level receive
|
|
* just update stats and set media busy
|
|
*/
|
|
irda_device_set_media_busy(dev->netdev, TRUE);
|
|
dev->stats.rx_dropped++;
|
|
IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __func__, count);
|
|
return 0;
|
|
}
|
|
|
|
/* Read the characters into the buffer */
|
|
if (likely(atomic_read(&dev->enable_rx))) {
|
|
while (count--)
|
|
/* Unwrap and destuff one byte */
|
|
async_unwrap_char(dev->netdev, &dev->stats,
|
|
&dev->rx_buff, *cp++);
|
|
} else {
|
|
while (count--) {
|
|
/* rx not enabled: save the raw bytes and never
|
|
* trigger any netif_rx. The received bytes are flushed
|
|
* later when we re-enable rx but might be read meanwhile
|
|
* by the dongle driver.
|
|
*/
|
|
dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
|
|
|
|
/* What should we do when the buffer is full? */
|
|
if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
|
|
dev->rx_buff.len = 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(sirdev_receive);
|
|
|
|
/**********************************************************************/
|
|
|
|
/* callbacks from network layer */
|
|
|
|
static struct net_device_stats *sirdev_get_stats(struct net_device *ndev)
|
|
{
|
|
struct sir_dev *dev = ndev->priv;
|
|
|
|
return (dev) ? &dev->stats : NULL;
|
|
}
|
|
|
|
static int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
|
|
{
|
|
struct sir_dev *dev = ndev->priv;
|
|
unsigned long flags;
|
|
int actual = 0;
|
|
int err;
|
|
s32 speed;
|
|
|
|
IRDA_ASSERT(dev != NULL, return 0;);
|
|
|
|
netif_stop_queue(ndev);
|
|
|
|
IRDA_DEBUG(3, "%s(), skb->len = %d\n", __func__, skb->len);
|
|
|
|
speed = irda_get_next_speed(skb);
|
|
if ((speed != dev->speed) && (speed != -1)) {
|
|
if (!skb->len) {
|
|
err = sirdev_schedule_speed(dev, speed);
|
|
if (unlikely(err == -EWOULDBLOCK)) {
|
|
/* Failed to initiate the speed change, likely the fsm
|
|
* is still busy (pretty unlikely, but...)
|
|
* We refuse to accept the skb and return with the queue
|
|
* stopped so the network layer will retry after the
|
|
* fsm completes and wakes the queue.
|
|
*/
|
|
return 1;
|
|
}
|
|
else if (unlikely(err)) {
|
|
/* other fatal error - forget the speed change and
|
|
* hope the stack will recover somehow
|
|
*/
|
|
netif_start_queue(ndev);
|
|
}
|
|
/* else: success
|
|
* speed change in progress now
|
|
* on completion the queue gets restarted
|
|
*/
|
|
|
|
dev_kfree_skb_any(skb);
|
|
return 0;
|
|
} else
|
|
dev->new_speed = speed;
|
|
}
|
|
|
|
/* Init tx buffer*/
|
|
dev->tx_buff.data = dev->tx_buff.head;
|
|
|
|
/* Check problems */
|
|
if(spin_is_locked(&dev->tx_lock)) {
|
|
IRDA_DEBUG(3, "%s(), write not completed\n", __func__);
|
|
}
|
|
|
|
/* serialize with write completion */
|
|
spin_lock_irqsave(&dev->tx_lock, flags);
|
|
|
|
/* Copy skb to tx_buff while wrapping, stuffing and making CRC */
|
|
dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize);
|
|
|
|
/* transmission will start now - disable receive.
|
|
* if we are just in the middle of an incoming frame,
|
|
* treat it as collision. probably it's a good idea to
|
|
* reset the rx_buf OUTSIDE_FRAME in this case too?
|
|
*/
|
|
atomic_set(&dev->enable_rx, 0);
|
|
if (unlikely(sirdev_is_receiving(dev)))
|
|
dev->stats.collisions++;
|
|
|
|
actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
|
|
|
|
if (likely(actual > 0)) {
|
|
dev->tx_skb = skb;
|
|
ndev->trans_start = jiffies;
|
|
dev->tx_buff.data += actual;
|
|
dev->tx_buff.len -= actual;
|
|
}
|
|
else if (unlikely(actual < 0)) {
|
|
/* could be dropped later when we have tx_timeout to recover */
|
|
IRDA_ERROR("%s: drv->do_write failed (%d)\n",
|
|
__func__, actual);
|
|
dev_kfree_skb_any(skb);
|
|
dev->stats.tx_errors++;
|
|
dev->stats.tx_dropped++;
|
|
netif_wake_queue(ndev);
|
|
}
|
|
spin_unlock_irqrestore(&dev->tx_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* called from network layer with rtnl hold */
|
|
|
|
static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
|
|
{
|
|
struct if_irda_req *irq = (struct if_irda_req *) rq;
|
|
struct sir_dev *dev = ndev->priv;
|
|
int ret = 0;
|
|
|
|
IRDA_ASSERT(dev != NULL, return -1;);
|
|
|
|
IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __func__, ndev->name, cmd);
|
|
|
|
switch (cmd) {
|
|
case SIOCSBANDWIDTH: /* Set bandwidth */
|
|
if (!capable(CAP_NET_ADMIN))
|
|
ret = -EPERM;
|
|
else
|
|
ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
|
|
/* cannot sleep here for completion
|
|
* we are called from network layer with rtnl hold
|
|
*/
|
|
break;
|
|
|
|
case SIOCSDONGLE: /* Set dongle */
|
|
if (!capable(CAP_NET_ADMIN))
|
|
ret = -EPERM;
|
|
else
|
|
ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
|
|
/* cannot sleep here for completion
|
|
* we are called from network layer with rtnl hold
|
|
*/
|
|
break;
|
|
|
|
case SIOCSMEDIABUSY: /* Set media busy */
|
|
if (!capable(CAP_NET_ADMIN))
|
|
ret = -EPERM;
|
|
else
|
|
irda_device_set_media_busy(dev->netdev, TRUE);
|
|
break;
|
|
|
|
case SIOCGRECEIVING: /* Check if we are receiving right now */
|
|
irq->ifr_receiving = sirdev_is_receiving(dev);
|
|
break;
|
|
|
|
case SIOCSDTRRTS:
|
|
if (!capable(CAP_NET_ADMIN))
|
|
ret = -EPERM;
|
|
else
|
|
ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
|
|
/* cannot sleep here for completion
|
|
* we are called from network layer with rtnl hold
|
|
*/
|
|
break;
|
|
|
|
case SIOCSMODE:
|
|
#if 0
|
|
if (!capable(CAP_NET_ADMIN))
|
|
ret = -EPERM;
|
|
else
|
|
ret = sirdev_schedule_mode(dev, irq->ifr_mode);
|
|
/* cannot sleep here for completion
|
|
* we are called from network layer with rtnl hold
|
|
*/
|
|
break;
|
|
#endif
|
|
default:
|
|
ret = -EOPNOTSUPP;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------------- */
|
|
|
|
#define SIRBUF_ALLOCSIZE 4269 /* worst case size of a wrapped IrLAP frame */
|
|
|
|
static int sirdev_alloc_buffers(struct sir_dev *dev)
|
|
{
|
|
dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
|
|
dev->rx_buff.truesize = IRDA_SKB_MAX_MTU;
|
|
|
|
/* Bootstrap ZeroCopy Rx */
|
|
dev->rx_buff.skb = __dev_alloc_skb(dev->rx_buff.truesize, GFP_KERNEL);
|
|
if (dev->rx_buff.skb == NULL)
|
|
return -ENOMEM;
|
|
skb_reserve(dev->rx_buff.skb, 1);
|
|
dev->rx_buff.head = dev->rx_buff.skb->data;
|
|
|
|
dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
|
|
if (dev->tx_buff.head == NULL) {
|
|
kfree_skb(dev->rx_buff.skb);
|
|
dev->rx_buff.skb = NULL;
|
|
dev->rx_buff.head = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev->tx_buff.data = dev->tx_buff.head;
|
|
dev->rx_buff.data = dev->rx_buff.head;
|
|
dev->tx_buff.len = 0;
|
|
dev->rx_buff.len = 0;
|
|
|
|
dev->rx_buff.in_frame = FALSE;
|
|
dev->rx_buff.state = OUTSIDE_FRAME;
|
|
return 0;
|
|
};
|
|
|
|
static void sirdev_free_buffers(struct sir_dev *dev)
|
|
{
|
|
if (dev->rx_buff.skb)
|
|
kfree_skb(dev->rx_buff.skb);
|
|
kfree(dev->tx_buff.head);
|
|
dev->rx_buff.head = dev->tx_buff.head = NULL;
|
|
dev->rx_buff.skb = NULL;
|
|
}
|
|
|
|
static int sirdev_open(struct net_device *ndev)
|
|
{
|
|
struct sir_dev *dev = ndev->priv;
|
|
const struct sir_driver *drv = dev->drv;
|
|
|
|
if (!drv)
|
|
return -ENODEV;
|
|
|
|
/* increase the reference count of the driver module before doing serious stuff */
|
|
if (!try_module_get(drv->owner))
|
|
return -ESTALE;
|
|
|
|
IRDA_DEBUG(2, "%s()\n", __func__);
|
|
|
|
if (sirdev_alloc_buffers(dev))
|
|
goto errout_dec;
|
|
|
|
if (!dev->drv->start_dev || dev->drv->start_dev(dev))
|
|
goto errout_free;
|
|
|
|
sirdev_enable_rx(dev);
|
|
dev->raw_tx = 0;
|
|
|
|
netif_start_queue(ndev);
|
|
dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
|
|
if (!dev->irlap)
|
|
goto errout_stop;
|
|
|
|
netif_wake_queue(ndev);
|
|
|
|
IRDA_DEBUG(2, "%s - done, speed = %d\n", __func__, dev->speed);
|
|
|
|
return 0;
|
|
|
|
errout_stop:
|
|
atomic_set(&dev->enable_rx, 0);
|
|
if (dev->drv->stop_dev)
|
|
dev->drv->stop_dev(dev);
|
|
errout_free:
|
|
sirdev_free_buffers(dev);
|
|
errout_dec:
|
|
module_put(drv->owner);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static int sirdev_close(struct net_device *ndev)
|
|
{
|
|
struct sir_dev *dev = ndev->priv;
|
|
const struct sir_driver *drv;
|
|
|
|
// IRDA_DEBUG(0, "%s\n", __func__);
|
|
|
|
netif_stop_queue(ndev);
|
|
|
|
down(&dev->fsm.sem); /* block on pending config completion */
|
|
|
|
atomic_set(&dev->enable_rx, 0);
|
|
|
|
if (unlikely(!dev->irlap))
|
|
goto out;
|
|
irlap_close(dev->irlap);
|
|
dev->irlap = NULL;
|
|
|
|
drv = dev->drv;
|
|
if (unlikely(!drv || !dev->priv))
|
|
goto out;
|
|
|
|
if (drv->stop_dev)
|
|
drv->stop_dev(dev);
|
|
|
|
sirdev_free_buffers(dev);
|
|
module_put(drv->owner);
|
|
|
|
out:
|
|
dev->speed = 0;
|
|
up(&dev->fsm.sem);
|
|
return 0;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------------- */
|
|
|
|
struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
|
|
{
|
|
struct net_device *ndev;
|
|
struct sir_dev *dev;
|
|
|
|
IRDA_DEBUG(0, "%s - %s\n", __func__, name);
|
|
|
|
/* instead of adding tests to protect against drv->do_write==NULL
|
|
* at several places we refuse to create a sir_dev instance for
|
|
* drivers which don't implement do_write.
|
|
*/
|
|
if (!drv || !drv->do_write)
|
|
return NULL;
|
|
|
|
/*
|
|
* Allocate new instance of the device
|
|
*/
|
|
ndev = alloc_irdadev(sizeof(*dev));
|
|
if (ndev == NULL) {
|
|
IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __func__);
|
|
goto out;
|
|
}
|
|
dev = ndev->priv;
|
|
|
|
irda_init_max_qos_capabilies(&dev->qos);
|
|
dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
|
|
dev->qos.min_turn_time.bits = drv->qos_mtt_bits;
|
|
irda_qos_bits_to_value(&dev->qos);
|
|
|
|
strncpy(dev->hwname, name, sizeof(dev->hwname)-1);
|
|
|
|
atomic_set(&dev->enable_rx, 0);
|
|
dev->tx_skb = NULL;
|
|
|
|
spin_lock_init(&dev->tx_lock);
|
|
init_MUTEX(&dev->fsm.sem);
|
|
|
|
dev->drv = drv;
|
|
dev->netdev = ndev;
|
|
|
|
/* Override the network functions we need to use */
|
|
ndev->hard_start_xmit = sirdev_hard_xmit;
|
|
ndev->open = sirdev_open;
|
|
ndev->stop = sirdev_close;
|
|
ndev->get_stats = sirdev_get_stats;
|
|
ndev->do_ioctl = sirdev_ioctl;
|
|
|
|
if (register_netdev(ndev)) {
|
|
IRDA_ERROR("%s(), register_netdev() failed!\n", __func__);
|
|
goto out_freenetdev;
|
|
}
|
|
|
|
return dev;
|
|
|
|
out_freenetdev:
|
|
free_netdev(ndev);
|
|
out:
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(sirdev_get_instance);
|
|
|
|
int sirdev_put_instance(struct sir_dev *dev)
|
|
{
|
|
int err = 0;
|
|
|
|
IRDA_DEBUG(0, "%s\n", __func__);
|
|
|
|
atomic_set(&dev->enable_rx, 0);
|
|
|
|
netif_carrier_off(dev->netdev);
|
|
netif_device_detach(dev->netdev);
|
|
|
|
if (dev->dongle_drv)
|
|
err = sirdev_schedule_dongle_close(dev);
|
|
if (err)
|
|
IRDA_ERROR("%s - error %d\n", __func__, err);
|
|
|
|
sirdev_close(dev->netdev);
|
|
|
|
down(&dev->fsm.sem);
|
|
dev->fsm.state = SIRDEV_STATE_DEAD; /* mark staled */
|
|
dev->dongle_drv = NULL;
|
|
dev->priv = NULL;
|
|
up(&dev->fsm.sem);
|
|
|
|
/* Remove netdevice */
|
|
unregister_netdev(dev->netdev);
|
|
|
|
free_netdev(dev->netdev);
|
|
|
|
return 0;
|
|
}
|
|
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");
|