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path: root/drivers/net/irda/irport.c
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Diffstat (limited to 'drivers/net/irda/irport.c')
-rw-r--r--drivers/net/irda/irport.c1146
1 files changed, 1146 insertions, 0 deletions
diff --git a/drivers/net/irda/irport.c b/drivers/net/irda/irport.c
new file mode 100644
index 000000000000..5971315f3fa0
--- /dev/null
+++ b/drivers/net/irda/irport.c
@@ -0,0 +1,1146 @@
+/*********************************************************************
+ *
+ * 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,
+ struct pt_regs *regs);
+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);
+
+ if (self->tx_buff.head)
+ 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_probe (void)
+ *
+ * Start IO port
+ *
+ */
+int irport_probe(int iobase)
+{
+ IRDA_DEBUG(4, "%s(), iobase=%#x\n", __FUNCTION__, iobase);
+
+ return 0;
+}
+
+/*
+ * 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
+ *
+ */
+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 aquired.
+ * 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, regs)
+ *
+ * Interrupt handler
+ */
+static irqreturn_t irport_interrupt(int irq, void *dev_id,
+ struct pt_regs *regs)
+{
+ struct net_device *dev = (struct net_device *) dev_id;
+ struct irport_cb *self;
+ int boguscount = 0;
+ int iobase;
+ int iir, lsr;
+ int handled = 0;
+
+ if (!dev) {
+ IRDA_WARNING("%s() irq %d for unknown device.\n", __FUNCTION__, irq);
+ return IRQ_NONE;
+ }
+ self = (struct irport_cb *) 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 < 4); 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 < 4; i++) {
+ if (dev_self[i])
+ irport_close(dev_self[i]);
+ }
+}
+
+MODULE_PARM(io, "1-4i");
+MODULE_PARM_DESC(io, "Base I/O addresses");
+MODULE_PARM(irq, "1-4i");
+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);
+