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linux/drivers/net/irda/irport.c
Jeff Garzik c31f28e778 drivers/net: eliminate irq handler impossible checks, needless casts 
- Eliminate check for irq handler 'dev_id==NULL' where the
  condition never occurs.

- Eliminate needless casts to/from void*

Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-10-06 14:56:04 -04:00

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/*********************************************************************
*
* Filename: irport.c
* Version: 1.0
* Description: Half duplex serial port SIR driver for IrDA.
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Sun Aug 3 13:49:59 1997
* Modified at: Fri Jan 28 20:22:38 2000
* Modified by: Dag Brattli <dagb@cs.uit.no>
* Sources: serial.c by Linus Torvalds
*
* Copyright (c) 1997, 1998, 1999-2000 Dag Brattli, All Rights Reserved.
* Copyright (c) 2000-2003 Jean Tourrilhes, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* This driver is ment to be a small half duplex serial driver to be
* used for IR-chipsets that has a UART (16550) compatibility mode.
* Eventually it will replace irtty, because of irtty has some
* problems that is hard to get around when we don't have control
* over the serial driver. This driver may also be used by FIR
* drivers to handle SIR mode for them.
*
********************************************************************/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/serial_reg.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/rtnetlink.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/io.h>
#include <net/irda/irda.h>
#include <net/irda/wrapper.h>
#include "irport.h"
#define IO_EXTENT 8
/*
* Currently you'll need to set these values using insmod like this:
* insmod irport io=0x3e8 irq=11
*/
static unsigned int io[] = { ~0, ~0, ~0, ~0 };
static unsigned int irq[] = { 0, 0, 0, 0 };
static unsigned int qos_mtt_bits = 0x03;
static struct irport_cb *dev_self[] = { NULL, NULL, NULL, NULL};
static char *driver_name = "irport";
static inline void irport_write_wakeup(struct irport_cb *self);
static inline int irport_write(int iobase, int fifo_size, __u8 *buf, int len);
static inline void irport_receive(struct irport_cb *self);
static int irport_net_ioctl(struct net_device *dev, struct ifreq *rq,
int cmd);
static inline int irport_is_receiving(struct irport_cb *self);
static int irport_set_dtr_rts(struct net_device *dev, int dtr, int rts);
static int irport_raw_write(struct net_device *dev, __u8 *buf, int len);
static struct net_device_stats *irport_net_get_stats(struct net_device *dev);
static int irport_change_speed_complete(struct irda_task *task);
static void irport_timeout(struct net_device *dev);
static irqreturn_t irport_interrupt(int irq, void *dev_id);
static int irport_hard_xmit(struct sk_buff *skb, struct net_device *dev);
static void irport_change_speed(void *priv, __u32 speed);
static int irport_net_open(struct net_device *dev);
static int irport_net_close(struct net_device *dev);
static struct irport_cb *
irport_open(int i, unsigned int iobase, unsigned int irq)
{
struct net_device *dev;
struct irport_cb *self;
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
/* Lock the port that we need */
if (!request_region(iobase, IO_EXTENT, driver_name)) {
IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
__FUNCTION__, iobase);
goto err_out1;
}
/*
* Allocate new instance of the driver
*/
dev = alloc_irdadev(sizeof(struct irport_cb));
if (!dev) {
IRDA_ERROR("%s(), can't allocate memory for "
"irda device!\n", __FUNCTION__);
goto err_out2;
}
self = dev->priv;
spin_lock_init(&self->lock);
/* Need to store self somewhere */
dev_self[i] = self;
self->priv = self;
self->index = i;
/* Initialize IO */
self->io.sir_base = iobase;
self->io.sir_ext = IO_EXTENT;
self->io.irq = irq;
self->io.fifo_size = 16; /* 16550A and compatible */
/* Initialize QoS for this device */
irda_init_max_qos_capabilies(&self->qos);
self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
IR_115200;
self->qos.min_turn_time.bits = qos_mtt_bits;
irda_qos_bits_to_value(&self->qos);
/* Bootstrap ZeroCopy Rx */
self->rx_buff.truesize = IRDA_SKB_MAX_MTU;
self->rx_buff.skb = __dev_alloc_skb(self->rx_buff.truesize,
GFP_KERNEL);
if (self->rx_buff.skb == NULL) {
IRDA_ERROR("%s(), can't allocate memory for "
"receive buffer!\n", __FUNCTION__);
goto err_out3;
}
skb_reserve(self->rx_buff.skb, 1);
self->rx_buff.head = self->rx_buff.skb->data;
/* No need to memset the buffer, unless you are really pedantic */
/* Finish setup the Rx buffer descriptor */
self->rx_buff.in_frame = FALSE;
self->rx_buff.state = OUTSIDE_FRAME;
self->rx_buff.data = self->rx_buff.head;
/* Specify how much memory we want */
self->tx_buff.truesize = 4000;
/* Allocate memory if needed */
if (self->tx_buff.truesize > 0) {
self->tx_buff.head = (__u8 *) kmalloc(self->tx_buff.truesize,
GFP_KERNEL);
if (self->tx_buff.head == NULL) {
IRDA_ERROR("%s(), can't allocate memory for "
"transmit buffer!\n", __FUNCTION__);
goto err_out4;
}
memset(self->tx_buff.head, 0, self->tx_buff.truesize);
}
self->tx_buff.data = self->tx_buff.head;
self->netdev = dev;
/* Keep track of module usage */
SET_MODULE_OWNER(dev);
/* May be overridden by piggyback drivers */
self->interrupt = irport_interrupt;
self->change_speed = irport_change_speed;
/* Override the network functions we need to use */
dev->hard_start_xmit = irport_hard_xmit;
dev->tx_timeout = irport_timeout;
dev->watchdog_timeo = HZ; /* Allow time enough for speed change */
dev->open = irport_net_open;
dev->stop = irport_net_close;
dev->get_stats = irport_net_get_stats;
dev->do_ioctl = irport_net_ioctl;
/* Make ifconfig display some details */
dev->base_addr = iobase;
dev->irq = irq;
if (register_netdev(dev)) {
IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
goto err_out5;
}
IRDA_MESSAGE("IrDA: Registered device %s (irport io=0x%X irq=%d)\n",
dev->name, iobase, irq);
return self;
err_out5:
kfree(self->tx_buff.head);
err_out4:
kfree_skb(self->rx_buff.skb);
err_out3:
free_netdev(dev);
dev_self[i] = NULL;
err_out2:
release_region(iobase, IO_EXTENT);
err_out1:
return NULL;
}
static int irport_close(struct irport_cb *self)
{
IRDA_ASSERT(self != NULL, return -1;);
/* We are not using any dongle anymore! */
if (self->dongle)
irda_device_dongle_cleanup(self->dongle);
self->dongle = NULL;
/* Remove netdevice */
unregister_netdev(self->netdev);
/* Release the IO-port that this driver is using */
IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
__FUNCTION__, self->io.sir_base);
release_region(self->io.sir_base, self->io.sir_ext);
kfree(self->tx_buff.head);
if (self->rx_buff.skb)
kfree_skb(self->rx_buff.skb);
self->rx_buff.skb = NULL;
/* Remove ourselves */
dev_self[self->index] = NULL;
free_netdev(self->netdev);
return 0;
}
static void irport_stop(struct irport_cb *self)
{
int iobase;
iobase = self->io.sir_base;
/* We can't lock, we may be called from a FIR driver - Jean II */
/* We are not transmitting any more */
self->transmitting = 0;
/* Reset UART */
outb(0, iobase+UART_MCR);
/* Turn off interrupts */
outb(0, iobase+UART_IER);
}
static void irport_start(struct irport_cb *self)
{
int iobase;
iobase = self->io.sir_base;
irport_stop(self);
/* We can't lock, we may be called from a FIR driver - Jean II */
/* Initialize UART */
outb(UART_LCR_WLEN8, iobase+UART_LCR); /* Reset DLAB */
outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase+UART_MCR);
/* Turn on interrups */
outb(UART_IER_RLSI | UART_IER_RDI |UART_IER_THRI, iobase+UART_IER);
}
/*
* Function irport_get_fcr (speed)
*
* Compute value of fcr
*
*/
static inline unsigned int irport_get_fcr(__u32 speed)
{
unsigned int fcr; /* FIFO control reg */
/* Enable fifos */
fcr = UART_FCR_ENABLE_FIFO;
/*
* Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
* almost 1,7 ms at 19200 bps. At speeds above that we can just forget
* about this timeout since it will always be fast enough.
*/
if (speed < 38400)
fcr |= UART_FCR_TRIGGER_1;
else
//fcr |= UART_FCR_TRIGGER_14;
fcr |= UART_FCR_TRIGGER_8;
return(fcr);
}
/*
* Function irport_change_speed (self, speed)
*
* Set speed of IrDA port to specified baudrate
*
* This function should be called with irq off and spin-lock.
*/
static void irport_change_speed(void *priv, __u32 speed)
{
struct irport_cb *self = (struct irport_cb *) priv;
int iobase;
unsigned int fcr; /* FIFO control reg */
unsigned int lcr; /* Line control reg */
int divisor;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(speed != 0, return;);
IRDA_DEBUG(1, "%s(), Setting speed to: %d - iobase=%#x\n",
__FUNCTION__, speed, self->io.sir_base);
/* We can't lock, we may be called from a FIR driver - Jean II */
iobase = self->io.sir_base;
/* Update accounting for new speed */
self->io.speed = speed;
/* Turn off interrupts */
outb(0, iobase+UART_IER);
divisor = SPEED_MAX/speed;
/* Get proper fifo configuration */
fcr = irport_get_fcr(speed);
/* IrDA ports use 8N1 */
lcr = UART_LCR_WLEN8;
outb(UART_LCR_DLAB | lcr, iobase+UART_LCR); /* Set DLAB */
outb(divisor & 0xff, iobase+UART_DLL); /* Set speed */
outb(divisor >> 8, iobase+UART_DLM);
outb(lcr, iobase+UART_LCR); /* Set 8N1 */
outb(fcr, iobase+UART_FCR); /* Enable FIFO's */
/* Turn on interrups */
/* This will generate a fatal interrupt storm.
* People calling us will do that properly - Jean II */
//outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
}
/*
* Function __irport_change_speed (instance, state, param)
*
* State machine for changing speed of the device. We do it this way since
* we cannot use schedule_timeout() when we are in interrupt context
*
*/
static int __irport_change_speed(struct irda_task *task)
{
struct irport_cb *self;
__u32 speed = (__u32) task->param;
unsigned long flags = 0;
int wasunlocked = 0;
int ret = 0;
IRDA_DEBUG(2, "%s(), <%ld>\n", __FUNCTION__, jiffies);
self = (struct irport_cb *) task->instance;
IRDA_ASSERT(self != NULL, return -1;);
/* Locking notes : this function may be called from irq context with
* spinlock, via irport_write_wakeup(), or from non-interrupt without
* spinlock (from the task timer). Yuck !
* This is ugly, and unsafe is the spinlock is not already acquired.
* This will be fixed when irda-task get rewritten.
* Jean II */
if (!spin_is_locked(&self->lock)) {
spin_lock_irqsave(&self->lock, flags);
wasunlocked = 1;
}
switch (task->state) {
case IRDA_TASK_INIT:
case IRDA_TASK_WAIT:
/* Are we ready to change speed yet? */
if (self->tx_buff.len > 0) {
task->state = IRDA_TASK_WAIT;
/* Try again later */
ret = msecs_to_jiffies(20);
break;
}
if (self->dongle)
irda_task_next_state(task, IRDA_TASK_CHILD_INIT);
else
irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
break;
case IRDA_TASK_CHILD_INIT:
/* Go to default speed */
self->change_speed(self->priv, 9600);
/* Change speed of dongle */
if (irda_task_execute(self->dongle,
self->dongle->issue->change_speed,
NULL, task, (void *) speed))
{
/* Dongle need more time to change its speed */
irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
/* Give dongle 1 sec to finish */
ret = msecs_to_jiffies(1000);
} else
/* Child finished immediately */
irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
break;
case IRDA_TASK_CHILD_WAIT:
IRDA_WARNING("%s(), changing speed of dongle timed out!\n", __FUNCTION__);
ret = -1;
break;
case IRDA_TASK_CHILD_DONE:
/* Finally we are ready to change the speed */
self->change_speed(self->priv, speed);
irda_task_next_state(task, IRDA_TASK_DONE);
break;
default:
IRDA_ERROR("%s(), unknown state %d\n",
__FUNCTION__, task->state);
irda_task_next_state(task, IRDA_TASK_DONE);
ret = -1;
break;
}
/* Put stuff in the state we found them - Jean II */
if(wasunlocked) {
spin_unlock_irqrestore(&self->lock, flags);
}
return ret;
}
/*
* Function irport_change_speed_complete (task)
*
* Called when the change speed operation completes
*
*/
static int irport_change_speed_complete(struct irda_task *task)
{
struct irport_cb *self;
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
self = (struct irport_cb *) task->instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->netdev != NULL, return -1;);
/* Finished changing speed, so we are not busy any longer */
/* Signal network layer so it can try to send the frame */
netif_wake_queue(self->netdev);
return 0;
}
/*
* Function irport_timeout (struct net_device *dev)
*
* The networking layer thinks we timed out.
*
*/
static void irport_timeout(struct net_device *dev)
{
struct irport_cb *self;
int iobase;
int iir, lsr;
unsigned long flags;
self = (struct irport_cb *) dev->priv;
IRDA_ASSERT(self != NULL, return;);
iobase = self->io.sir_base;
IRDA_WARNING("%s: transmit timed out, jiffies = %ld, trans_start = %ld\n",
dev->name, jiffies, dev->trans_start);
spin_lock_irqsave(&self->lock, flags);
/* Debug what's happening... */
/* Get interrupt status */
lsr = inb(iobase+UART_LSR);
/* Read interrupt register */
iir = inb(iobase+UART_IIR);
IRDA_DEBUG(0, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
__FUNCTION__, iir, lsr, iobase);
IRDA_DEBUG(0, "%s(), transmitting=%d, remain=%d, done=%d\n",
__FUNCTION__, self->transmitting, self->tx_buff.len,
self->tx_buff.data - self->tx_buff.head);
/* Now, restart the port */
irport_start(self);
self->change_speed(self->priv, self->io.speed);
/* This will re-enable irqs */
outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
dev->trans_start = jiffies;
spin_unlock_irqrestore(&self->lock, flags);
netif_wake_queue(dev);
}
/*
* Function irport_wait_hw_transmitter_finish ()
*
* Wait for the real end of HW transmission
*
* The UART is a strict FIFO, and we get called only when we have finished
* pushing data to the FIFO, so the maximum amount of time we must wait
* is only for the FIFO to drain out.
*
* We use a simple calibrated loop. We may need to adjust the loop
* delay (udelay) to balance I/O traffic and latency. And we also need to
* adjust the maximum timeout.
* It would probably be better to wait for the proper interrupt,
* but it doesn't seem to be available.
*
* We can't use jiffies or kernel timers because :
* 1) We are called from the interrupt handler, which disable softirqs,
* so jiffies won't be increased
* 2) Jiffies granularity is usually very coarse (10ms), and we don't
* want to wait that long to detect stuck hardware.
* Jean II
*/
static void irport_wait_hw_transmitter_finish(struct irport_cb *self)
{
int iobase;
int count = 1000; /* 1 ms */
iobase = self->io.sir_base;
/* Calibrated busy loop */
while((count-- > 0) && !(inb(iobase+UART_LSR) & UART_LSR_TEMT))
udelay(1);
if(count == 0)
IRDA_DEBUG(0, "%s(): stuck transmitter\n", __FUNCTION__);
}
/*
* Function irport_hard_start_xmit (struct sk_buff *skb, struct net_device *dev)
*
* Transmits the current frame until FIFO is full, then
* waits until the next transmitt interrupt, and continues until the
* frame is transmitted.
*/
static int irport_hard_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct irport_cb *self;
unsigned long flags;
int iobase;
s32 speed;
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
IRDA_ASSERT(dev != NULL, return 0;);
self = (struct irport_cb *) dev->priv;
IRDA_ASSERT(self != NULL, return 0;);
iobase = self->io.sir_base;
netif_stop_queue(dev);
/* Make sure tests & speed change are atomic */
spin_lock_irqsave(&self->lock, flags);
/* Check if we need to change the speed */
speed = irda_get_next_speed(skb);
if ((speed != self->io.speed) && (speed != -1)) {
/* Check for empty frame */
if (!skb->len) {
/*
* We send frames one by one in SIR mode (no
* pipelining), so at this point, if we were sending
* a previous frame, we just received the interrupt
* telling us it is finished (UART_IIR_THRI).
* Therefore, waiting for the transmitter to really
* finish draining the fifo won't take too long.
* And the interrupt handler is not expected to run.
* - Jean II */
irport_wait_hw_transmitter_finish(self);
/* Better go there already locked - Jean II */
irda_task_execute(self, __irport_change_speed,
irport_change_speed_complete,
NULL, (void *) speed);
dev->trans_start = jiffies;
spin_unlock_irqrestore(&self->lock, flags);
dev_kfree_skb(skb);
return 0;
} else
self->new_speed = speed;
}
/* Init tx buffer */
self->tx_buff.data = self->tx_buff.head;
/* Copy skb to tx_buff while wrapping, stuffing and making CRC */
self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
self->tx_buff.truesize);
self->stats.tx_bytes += self->tx_buff.len;
/* We are transmitting */
self->transmitting = 1;
/* Turn on transmit finished interrupt. Will fire immediately! */
outb(UART_IER_THRI, iobase+UART_IER);
dev->trans_start = jiffies;
spin_unlock_irqrestore(&self->lock, flags);
dev_kfree_skb(skb);
return 0;
}
/*
* Function irport_write (driver)
*
* Fill Tx FIFO with transmit data
*
* Called only from irport_write_wakeup()
*/
static inline int irport_write(int iobase, int fifo_size, __u8 *buf, int len)
{
int actual = 0;
/* Fill FIFO with current frame */
while ((actual < fifo_size) && (actual < len)) {
/* Transmit next byte */
outb(buf[actual], iobase+UART_TX);
actual++;
}
return actual;
}
/*
* Function irport_write_wakeup (tty)
*
* Called by the driver when there's room for more data. If we have
* more packets to send, we send them here.
*
* Called only from irport_interrupt()
* Make sure this function is *not* called while we are receiving,
* otherwise we will reset fifo and loose data :-(
*/
static inline void irport_write_wakeup(struct irport_cb *self)
{
int actual = 0;
int iobase;
unsigned int fcr;
IRDA_ASSERT(self != NULL, return;);
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
iobase = self->io.sir_base;
/* Finished with frame? */
if (self->tx_buff.len > 0) {
/* Write data left in transmit buffer */
actual = irport_write(iobase, self->io.fifo_size,
self->tx_buff.data, self->tx_buff.len);
self->tx_buff.data += actual;
self->tx_buff.len -= actual;
} else {
/*
* Now serial buffer is almost free & we can start
* transmission of another packet. But first we must check
* if we need to change the speed of the hardware
*/
if (self->new_speed) {
irport_wait_hw_transmitter_finish(self);
irda_task_execute(self, __irport_change_speed,
irport_change_speed_complete,
NULL, (void *) self->new_speed);
self->new_speed = 0;
} else {
/* Tell network layer that we want more frames */
netif_wake_queue(self->netdev);
}
self->stats.tx_packets++;
/*
* Reset Rx FIFO to make sure that all reflected transmit data
* is discarded. This is needed for half duplex operation
*/
fcr = irport_get_fcr(self->io.speed);
fcr |= UART_FCR_CLEAR_RCVR;
outb(fcr, iobase+UART_FCR);
/* Finished transmitting */
self->transmitting = 0;
/* Turn on receive interrupts */
outb(UART_IER_RDI, iobase+UART_IER);
IRDA_DEBUG(1, "%s() : finished Tx\n", __FUNCTION__);
}
}
/*
* Function irport_receive (self)
*
* Receive one frame from the infrared port
*
* Called only from irport_interrupt()
*/
static inline void irport_receive(struct irport_cb *self)
{
int boguscount = 0;
int iobase;
IRDA_ASSERT(self != NULL, return;);
iobase = self->io.sir_base;
/*
* Receive all characters in Rx FIFO, unwrap and unstuff them.
* async_unwrap_char will deliver all found frames
*/
do {
async_unwrap_char(self->netdev, &self->stats, &self->rx_buff,
inb(iobase+UART_RX));
/* Make sure we don't stay here too long */
if (boguscount++ > 32) {
IRDA_DEBUG(2,"%s(), breaking!\n", __FUNCTION__);
break;
}
} while (inb(iobase+UART_LSR) & UART_LSR_DR);
}
/*
* Function irport_interrupt (irq, dev_id)
*
* Interrupt handler
*/
static irqreturn_t irport_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct irport_cb *self;
int boguscount = 0;
int iobase;
int iir, lsr;
int handled = 0;
self = dev->priv;
spin_lock(&self->lock);
iobase = self->io.sir_base;
/* Cut'n'paste interrupt routine from serial.c
* This version try to minimise latency and I/O operations.
* Simplified and modified to enforce half duplex operation.
* - Jean II */
/* Check status even is iir reg is cleared, more robust and
* eliminate a read on the I/O bus - Jean II */
do {
/* Get interrupt status ; Clear interrupt */
lsr = inb(iobase+UART_LSR);
/* Are we receiving or transmitting ? */
if(!self->transmitting) {
/* Received something ? */
if (lsr & UART_LSR_DR)
irport_receive(self);
} else {
/* Room in Tx fifo ? */
if (lsr & (UART_LSR_THRE | UART_LSR_TEMT))
irport_write_wakeup(self);
}
/* A bit hackish, but working as expected... Jean II */
if(lsr & (UART_LSR_THRE | UART_LSR_TEMT | UART_LSR_DR))
handled = 1;
/* Make sure we don't stay here to long */
if (boguscount++ > 10) {
IRDA_WARNING("%s() irq handler looping : lsr=%02x\n",
__FUNCTION__, lsr);
break;
}
/* Read interrupt register */
iir = inb(iobase+UART_IIR);
/* Enable this debug only when no other options and at low
* bit rates, otherwise it may cause Rx overruns (lsr=63).
* - Jean II */
IRDA_DEBUG(6, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
__FUNCTION__, iir, lsr, iobase);
/* As long as interrupt pending... */
} while ((iir & UART_IIR_NO_INT) == 0);
spin_unlock(&self->lock);
return IRQ_RETVAL(handled);
}
/*
* Function irport_net_open (dev)
*
* Network device is taken up. Usually this is done by "ifconfig irda0 up"
*
*/
static int irport_net_open(struct net_device *dev)
{
struct irport_cb *self;
int iobase;
char hwname[16];
unsigned long flags;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
IRDA_ASSERT(dev != NULL, return -1;);
self = (struct irport_cb *) dev->priv;
iobase = self->io.sir_base;
if (request_irq(self->io.irq, self->interrupt, 0, dev->name,
(void *) dev)) {
IRDA_DEBUG(0, "%s(), unable to allocate irq=%d\n",
__FUNCTION__, self->io.irq);
return -EAGAIN;
}
spin_lock_irqsave(&self->lock, flags);
/* Init uart */
irport_start(self);
/* Set 9600 bauds per default, including at the dongle */
irda_task_execute(self, __irport_change_speed,
irport_change_speed_complete,
NULL, (void *) 9600);
spin_unlock_irqrestore(&self->lock, flags);
/* Give self a hardware name */
sprintf(hwname, "SIR @ 0x%03x", self->io.sir_base);
/*
* Open new IrLAP layer instance, now that everything should be
* initialized properly
*/
self->irlap = irlap_open(dev, &self->qos, hwname);
/* Ready to play! */
netif_start_queue(dev);
return 0;
}
/*
* Function irport_net_close (self)
*
* Network device is taken down. Usually this is done by
* "ifconfig irda0 down"
*/
static int irport_net_close(struct net_device *dev)
{
struct irport_cb *self;
int iobase;
unsigned long flags;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(dev != NULL, return -1;);
self = (struct irport_cb *) dev->priv;
IRDA_ASSERT(self != NULL, return -1;);
iobase = self->io.sir_base;
/* Stop device */
netif_stop_queue(dev);
/* Stop and remove instance of IrLAP */
if (self->irlap)
irlap_close(self->irlap);
self->irlap = NULL;
spin_lock_irqsave(&self->lock, flags);
irport_stop(self);
spin_unlock_irqrestore(&self->lock, flags);
free_irq(self->io.irq, dev);
return 0;
}
/*
* Function irport_is_receiving (self)
*
* Returns true is we are currently receiving data
*
*/
static inline int irport_is_receiving(struct irport_cb *self)
{
return (self->rx_buff.state != OUTSIDE_FRAME);
}
/*
* Function irport_set_dtr_rts (tty, dtr, rts)
*
* This function can be used by dongles etc. to set or reset the status
* of the dtr and rts lines
*/
static int irport_set_dtr_rts(struct net_device *dev, int dtr, int rts)
{
struct irport_cb *self = dev->priv;
int iobase;
IRDA_ASSERT(self != NULL, return -1;);
iobase = self->io.sir_base;
if (dtr)
dtr = UART_MCR_DTR;
if (rts)
rts = UART_MCR_RTS;
outb(dtr|rts|UART_MCR_OUT2, iobase+UART_MCR);
return 0;
}
static int irport_raw_write(struct net_device *dev, __u8 *buf, int len)
{
struct irport_cb *self = (struct irport_cb *) dev->priv;
int actual = 0;
int iobase;
IRDA_ASSERT(self != NULL, return -1;);
iobase = self->io.sir_base;
/* Tx FIFO should be empty! */
if (!(inb(iobase+UART_LSR) & UART_LSR_THRE)) {
IRDA_DEBUG( 0, "%s(), failed, fifo not empty!\n", __FUNCTION__);
return -1;
}
/* Fill FIFO with current frame */
while (actual < len) {
/* Transmit next byte */
outb(buf[actual], iobase+UART_TX);
actual++;
}
return actual;
}
/*
* Function irport_net_ioctl (dev, rq, cmd)
*
* Process IOCTL commands for this device
*
*/
static int irport_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct if_irda_req *irq = (struct if_irda_req *) rq;
struct irport_cb *self;
dongle_t *dongle;
unsigned long flags;
int ret = 0;
IRDA_ASSERT(dev != NULL, return -1;);
self = dev->priv;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, dev->name, cmd);
switch (cmd) {
case SIOCSBANDWIDTH: /* Set bandwidth */
if (!capable(CAP_NET_ADMIN))
ret = -EPERM;
else
irda_task_execute(self, __irport_change_speed, NULL,
NULL, (void *) irq->ifr_baudrate);
break;
case SIOCSDONGLE: /* Set dongle */
if (!capable(CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
/* Locking :
* irda_device_dongle_init() can't be locked.
* irda_task_execute() doesn't need to be locked.
* Jean II
*/
/* Initialize dongle */
dongle = irda_device_dongle_init(dev, irq->ifr_dongle);
if (!dongle)
break;
dongle->set_mode = NULL;
dongle->read = NULL;
dongle->write = irport_raw_write;
dongle->set_dtr_rts = irport_set_dtr_rts;
/* Now initialize the dongle! */
dongle->issue->open(dongle, &self->qos);
/* Reset dongle */
irda_task_execute(dongle, dongle->issue->reset, NULL, NULL,
NULL);
/* Make dongle available to driver only now to avoid
* race conditions - Jean II */
self->dongle = dongle;
break;
case SIOCSMEDIABUSY: /* Set media busy */
if (!capable(CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
irda_device_set_media_busy(self->netdev, TRUE);
break;
case SIOCGRECEIVING: /* Check if we are receiving right now */
irq->ifr_receiving = irport_is_receiving(self);
break;
case SIOCSDTRRTS:
if (!capable(CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
/* No real need to lock... */
spin_lock_irqsave(&self->lock, flags);
irport_set_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
spin_unlock_irqrestore(&self->lock, flags);
break;
default:
ret = -EOPNOTSUPP;
}
return ret;
}
static struct net_device_stats *irport_net_get_stats(struct net_device *dev)
{
struct irport_cb *self = (struct irport_cb *) dev->priv;
return &self->stats;
}
static int __init irport_init(void)
{
int i;
for (i=0; (io[i] < 2000) && (i < ARRAY_SIZE(dev_self)); i++) {
if (irport_open(i, io[i], irq[i]) != NULL)
return 0;
}
/*
* Maybe something failed, but we can still be usable for FIR drivers
*/
return 0;
}
/*
* Function irport_cleanup ()
*
* Close all configured ports
*
*/
static void __exit irport_cleanup(void)
{
int i;
IRDA_DEBUG( 4, "%s()\n", __FUNCTION__);
for (i=0; i < ARRAY_SIZE(dev_self); i++) {
if (dev_self[i])
irport_close(dev_self[i]);
}
}
module_param_array(io, int, NULL, 0);
MODULE_PARM_DESC(io, "Base I/O addresses");
module_param_array(irq, int, NULL, 0);
MODULE_PARM_DESC(irq, "IRQ lines");
MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
MODULE_DESCRIPTION("Half duplex serial driver for IrDA SIR mode");
MODULE_LICENSE("GPL");
module_init(irport_init);
module_exit(irport_cleanup);
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