Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 642 insertions, 0 deletions

diff --git a/drivers/net/irda/irtty-sir.c b/drivers/net/irda/irtty-sir.c
new file mode 100644
index 000000000000..7d23aa375908
--- /dev/null
+++ b/drivers/net/irda/irtty-sir.c
@@ -0,0 +1,642 @@
+/*********************************************************************
+ *                
+ * Filename:      irtty-sir.c
+ * Version:       2.0
+ * Description:   IrDA line discipline implementation
+ * Status:        Experimental.
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Tue Dec  9 21:18:38 1997
+ * Modified at:   Sun Oct 27 22:13:30 2002
+ * Modified by:   Martin Diehl <mad@mdiehl.de>
+ * Sources:       slip.c by Laurence Culhane,   <loz@holmes.demon.co.uk>
+ *                          Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
+ * 
+ *     Copyright (c) 1998-2000 Dag Brattli,
+ *     Copyright (c) 2002 Martin Diehl,
+ *     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.
+ *  
+ *     Neither Dag Brattli nor University of Tromsų admit liability nor
+ *     provide warranty for any of this software. This material is 
+ *     provided "AS-IS" and at no charge.
+ *     
+ ********************************************************************/    
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/tty.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <linux/smp_lock.h>
+#include <linux/delay.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irda_device.h>
+
+#include "sir-dev.h"
+#include "irtty-sir.h"
+
+static int qos_mtt_bits = 0x03;      /* 5 ms or more */
+
+module_param(qos_mtt_bits, int, 0);
+MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
+
+/* ------------------------------------------------------- */
+
+/* device configuration callbacks always invoked with irda-thread context */
+
+/* find out, how many chars we have in buffers below us
+ * this is allowed to lie, i.e. return less chars than we
+ * actually have. The returned value is used to determine
+ * how long the irdathread should wait before doing the
+ * real blocking wait_until_sent()
+ */
+
+static int irtty_chars_in_buffer(struct sir_dev *dev)
+{
+        struct sirtty_cb *priv = dev->priv;
+
+        IRDA_ASSERT(priv != NULL, return -1;);
+        IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
+
+        return priv->tty->driver->chars_in_buffer(priv->tty);
+}
+
+/* Wait (sleep) until underlaying hardware finished transmission
+ * i.e. hardware buffers are drained
+ * this must block and not return before all characters are really sent
+ *
+ * If the tty sits on top of a 16550A-like uart, there are typically
+ * up to 16 bytes in the fifo - f.e. 9600 bps 8N1 needs 16.7 msec
+ *
+ * With usbserial the uart-fifo is basically replaced by the converter's
+ * outgoing endpoint buffer, which can usually hold 64 bytes (at least).
+ * With pl2303 it appears we are safe with 60msec here.
+ *
+ * I really wish all serial drivers would provide
+ * correct implementation of wait_until_sent()
+ */
+
+#define USBSERIAL_TX_DONE_DELAY 60
+
+static void irtty_wait_until_sent(struct sir_dev *dev)
+{
+        struct sirtty_cb *priv = dev->priv;
+        struct tty_struct *tty;
+
+        IRDA_ASSERT(priv != NULL, return;);
+        IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
+
+        tty = priv->tty;
+        if (tty->driver->wait_until_sent) {
+                lock_kernel();
+                tty->driver->wait_until_sent(tty, msecs_to_jiffies(100));
+                unlock_kernel();
+        }
+        else {
+                msleep(USBSERIAL_TX_DONE_DELAY);
+        }
+}
+
+/* 
+ *  Function irtty_change_speed (dev, speed)
+ *
+ *    Change the speed of the serial port.
+ *
+ * This may sleep in set_termios (usbserial driver f.e.) and must
+ * not be called from interrupt/timer/tasklet therefore.
+ * All such invocations are deferred to kIrDAd now so we can sleep there.
+ */
+
+static int irtty_change_speed(struct sir_dev *dev, unsigned speed)
+{
+        struct sirtty_cb *priv = dev->priv;
+        struct tty_struct *tty;
+        struct termios old_termios;
+        int cflag;
+
+        IRDA_ASSERT(priv != NULL, return -1;);
+        IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
+
+        tty = priv->tty;
+
+        lock_kernel();
+        old_termios = *(tty->termios);
+        cflag = tty->termios->c_cflag;
+
+        cflag &= ~CBAUD;
+
+        IRDA_DEBUG(2, "%s(), Setting speed to %d\n", __FUNCTION__, speed);
+
+        switch (speed) {
+        case 1200:
+                cflag |= B1200;
+                break;
+        case 2400:
+                cflag |= B2400;
+                break;
+        case 4800:
+                cflag |= B4800;
+                break;
+        case 19200:
+                cflag |= B19200;
+                break;
+        case 38400:
+                cflag |= B38400;
+                break;
+        case 57600:
+                cflag |= B57600;
+                break;
+        case 115200:
+                cflag |= B115200;
+                break;
+        case 9600:
+        default:
+                cflag |= B9600;
+                break;
+        }       
+
+        tty->termios->c_cflag = cflag;
+        if (tty->driver->set_termios)
+                tty->driver->set_termios(tty, &old_termios);
+        unlock_kernel();
+
+        priv->io.speed = speed;
+
+        return 0;
+}
+
+/*
+ * Function irtty_set_dtr_rts (dev, dtr, rts)
+ *
+ *    This function can be used by dongles etc. to set or reset the status
+ *    of the dtr and rts lines
+ */
+
+static int irtty_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
+{
+        struct sirtty_cb *priv = dev->priv;
+        int set = 0;
+        int clear = 0;
+
+        IRDA_ASSERT(priv != NULL, return -1;);
+        IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
+
+        if (rts)
+                set |= TIOCM_RTS;
+        else
+                clear |= TIOCM_RTS;
+        if (dtr)
+                set |= TIOCM_DTR;
+        else
+                clear |= TIOCM_DTR;
+
+        /*
+         * We can't use ioctl() because it expects a non-null file structure,
+         * and we don't have that here.
+         * This function is not yet defined for all tty driver, so
+         * let's be careful... Jean II
+         */
+        IRDA_ASSERT(priv->tty->driver->tiocmset != NULL, return -1;);
+        priv->tty->driver->tiocmset(priv->tty, NULL, set, clear);
+
+        return 0;
+}
+
+/* ------------------------------------------------------- */
+
+/* called from sir_dev when there is more data to send
+ * context is either netdev->hard_xmit or some transmit-completion bh
+ * i.e. we are under spinlock here and must not sleep.
+ */
+
+static int irtty_do_write(struct sir_dev *dev, const unsigned char *ptr, size_t len)
+{
+        struct sirtty_cb *priv = dev->priv;
+        struct tty_struct *tty;
+        int writelen;
+
+        IRDA_ASSERT(priv != NULL, return -1;);
+        IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
+
+        tty = priv->tty;
+        if (!tty->driver->write)
+                return 0;
+        tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
+        if (tty->driver->write_room) {
+                writelen = tty->driver->write_room(tty);
+                if (writelen > len)
+                        writelen = len;
+        }
+        else
+                writelen = len;
+        return tty->driver->write(tty, ptr, writelen);
+}
+
+/* ------------------------------------------------------- */
+
+/* irda line discipline callbacks */
+
+/* 
+ *  Function irtty_receive_buf( tty, cp, count)
+ *
+ *    Handle the 'receiver data ready' interrupt.  This function is called
+ *    by the 'tty_io' module in the kernel when a block of IrDA data has
+ *    been received, which can now be decapsulated and delivered for
+ *    further processing 
+ *
+ * calling context depends on underlying driver and tty->low_latency!
+ * for example (low_latency: 1 / 0):
+ * serial.c:    uart-interrupt / softint
+ * usbserial:   urb-complete-interrupt / softint
+ */
+
+static void irtty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
+                              char *fp, int count) 
+{
+        struct sir_dev *dev;
+        struct sirtty_cb *priv = tty->disc_data;
+        int     i;
+
+        IRDA_ASSERT(priv != NULL, return;);
+        IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
+
+        if (unlikely(count==0))         /* yes, this happens */
+                return;
+
+        dev = priv->dev;
+        if (!dev) {
+                IRDA_WARNING("%s(), not ready yet!\n", __FUNCTION__);
+                return;
+        }
+
+        for (i = 0; i < count; i++) {
+                /* 
+                 *  Characters received with a parity error, etc?
+                 */
+                if (fp && *fp++) { 
+                        IRDA_DEBUG(0, "Framing or parity error!\n");
+                        sirdev_receive(dev, NULL, 0);   /* notify sir_dev (updating stats) */
+                        return;
+                }
+        }
+
+        sirdev_receive(dev, cp, count);
+}
+
+/*
+ * Function irtty_receive_room (tty)
+ *
+ *    Used by the TTY to find out how much data we can receive at a time
+ * 
+*/
+static int irtty_receive_room(struct tty_struct *tty) 
+{
+        struct sirtty_cb *priv = tty->disc_data;
+
+        IRDA_ASSERT(priv != NULL, return 0;);
+        IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return 0;);
+
+        return 65536;  /* We can handle an infinite amount of data. :-) */
+}
+
+/*
+ * Function irtty_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.
+ *
+ */
+static void irtty_write_wakeup(struct tty_struct *tty) 
+{
+        struct sirtty_cb *priv = tty->disc_data;
+
+        IRDA_ASSERT(priv != NULL, return;);
+        IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
+
+        tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
+
+        if (priv->dev)
+                sirdev_write_complete(priv->dev);
+}
+
+/* ------------------------------------------------------- */
+
+/*
+ * Function irtty_stop_receiver (tty, stop)
+ *
+ */
+
+static inline void irtty_stop_receiver(struct tty_struct *tty, int stop)
+{
+        struct termios old_termios;
+        int cflag;
+
+        lock_kernel();
+        old_termios = *(tty->termios);
+        cflag = tty->termios->c_cflag;
+        
+        if (stop)
+                cflag &= ~CREAD;
+        else
+                cflag |= CREAD;
+
+        tty->termios->c_cflag = cflag;
+        if (tty->driver->set_termios)
+                tty->driver->set_termios(tty, &old_termios);
+        unlock_kernel();
+}
+
+/*****************************************************************/
+
+/* serialize ldisc open/close with sir_dev */
+static DECLARE_MUTEX(irtty_sem);
+
+/* notifier from sir_dev when irda% device gets opened (ifup) */
+
+static int irtty_start_dev(struct sir_dev *dev)
+{
+        struct sirtty_cb *priv;
+        struct tty_struct *tty;
+
+        /* serialize with ldisc open/close */
+        down(&irtty_sem);
+
+        priv = dev->priv;
+        if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) {
+                up(&irtty_sem);
+                return -ESTALE;
+        }
+
+        tty = priv->tty;
+
+        if (tty->driver->start)
+                tty->driver->start(tty);
+        /* Make sure we can receive more data */
+        irtty_stop_receiver(tty, FALSE);
+
+        up(&irtty_sem);
+        return 0;
+}
+
+/* notifier from sir_dev when irda% device gets closed (ifdown) */
+
+static int irtty_stop_dev(struct sir_dev *dev)
+{
+        struct sirtty_cb *priv;
+        struct tty_struct *tty;
+
+        /* serialize with ldisc open/close */
+        down(&irtty_sem);
+
+        priv = dev->priv;
+        if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) {
+                up(&irtty_sem);
+                return -ESTALE;
+        }
+
+        tty = priv->tty;
+
+        /* Make sure we don't receive more data */
+        irtty_stop_receiver(tty, TRUE);
+        if (tty->driver->stop)
+                tty->driver->stop(tty);
+
+        up(&irtty_sem);
+
+        return 0;
+}
+
+/* ------------------------------------------------------- */
+
+static struct sir_driver sir_tty_drv = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "sir_tty",
+        .start_dev              = irtty_start_dev,
+        .stop_dev               = irtty_stop_dev,
+        .do_write               = irtty_do_write,
+        .chars_in_buffer        = irtty_chars_in_buffer,
+        .wait_until_sent        = irtty_wait_until_sent,
+        .set_speed              = irtty_change_speed,
+        .set_dtr_rts            = irtty_set_dtr_rts,
+};
+
+/* ------------------------------------------------------- */
+
+/*
+ * Function irtty_ioctl (tty, file, cmd, arg)
+ *
+ *     The Swiss army knife of system calls :-)
+ *
+ */
+static int irtty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
+{
+        struct irtty_info { char name[6]; } info;
+        struct sir_dev *dev;
+        struct sirtty_cb *priv = tty->disc_data;
+        int err = 0;
+
+        IRDA_ASSERT(priv != NULL, return -ENODEV;);
+        IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -EBADR;);
+
+        IRDA_DEBUG(3, "%s(cmd=0x%X)\n", __FUNCTION__, cmd);
+
+        dev = priv->dev;
+        IRDA_ASSERT(dev != NULL, return -1;);
+
+        switch (cmd) {
+        case TCGETS:
+        case TCGETA:
+                err = n_tty_ioctl(tty, file, cmd, arg);
+                break;
+
+        case IRTTY_IOCTDONGLE:
+                /* this call blocks for completion */
+                err = sirdev_set_dongle(dev, (IRDA_DONGLE) arg);
+                break;
+
+        case IRTTY_IOCGET:
+                IRDA_ASSERT(dev->netdev != NULL, return -1;);
+
+                memset(&info, 0, sizeof(info)); 
+                strncpy(info.name, dev->netdev->name, sizeof(info.name)-1);
+
+                if (copy_to_user((void __user *)arg, &info, sizeof(info)))
+                        err = -EFAULT;
+                break;
+        default:
+                err = -ENOIOCTLCMD;
+                break;
+        }
+        return err;
+}
+
+
+/* 
+ *  Function irtty_open(tty)
+ *
+ *    This function is called by the TTY module when the IrDA line
+ *    discipline is called for.  Because we are sure the tty line exists,
+ *    we only have to link it to a free IrDA channel.  
+ */
+static int irtty_open(struct tty_struct *tty) 
+{
+        struct sir_dev *dev;
+        struct sirtty_cb *priv;
+        int ret = 0;
+
+        /* Module stuff handled via irda_ldisc.owner - Jean II */
+
+        /* First make sure we're not already connected. */
+        if (tty->disc_data != NULL) {
+                priv = tty->disc_data;
+                if (priv && priv->magic == IRTTY_MAGIC) {
+                        ret = -EEXIST;
+                        goto out;
+                }
+                tty->disc_data = NULL;          /* ### */
+        }
+
+        /* stop the underlying  driver */
+        irtty_stop_receiver(tty, TRUE);
+        if (tty->driver->stop)
+                tty->driver->stop(tty);
+
+        if (tty->driver->flush_buffer)
+                tty->driver->flush_buffer(tty);
+        
+        /* apply mtt override */
+        sir_tty_drv.qos_mtt_bits = qos_mtt_bits;
+
+        /* get a sir device instance for this driver */
+        dev = sirdev_get_instance(&sir_tty_drv, tty->name);
+        if (!dev) {
+                ret = -ENODEV;
+                goto out;
+        }
+
+        /* allocate private device info block */
+        priv = kmalloc(sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                goto out_put;
+        memset(priv, 0, sizeof(*priv));
+
+        priv->magic = IRTTY_MAGIC;
+        priv->tty = tty;
+        priv->dev = dev;
+
+        /* serialize with start_dev - in case we were racing with ifup */
+        down(&irtty_sem);
+
+        dev->priv = priv;
+        tty->disc_data = priv;
+
+        up(&irtty_sem);
+
+        IRDA_DEBUG(0, "%s - %s: irda line discipline opened\n", __FUNCTION__, tty->name);
+
+        return 0;
+
+out_put:
+        sirdev_put_instance(dev);
+out:
+        return ret;
+}
+
+/* 
+ *  Function irtty_close (tty)
+ *
+ *    Close down a IrDA channel. This means flushing out any pending queues,
+ *    and then restoring the TTY line discipline to what it was before it got
+ *    hooked to IrDA (which usually is TTY again).  
+ */
+static void irtty_close(struct tty_struct *tty) 
+{
+        struct sirtty_cb *priv = tty->disc_data;
+
+        IRDA_ASSERT(priv != NULL, return;);
+        IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
+
+        /* Hm, with a dongle attached the dongle driver wants
+         * to close the dongle - which requires the use of
+         * some tty write and/or termios or ioctl operations.
+         * Are we allowed to call those when already requested
+         * to shutdown the ldisc?
+         * If not, we should somehow mark the dev being staled.
+         * Question remains, how to close the dongle in this case...
+         * For now let's assume we are granted to issue tty driver calls
+         * until we return here from the ldisc close. I'm just wondering
+         * how this behaves with hotpluggable serial hardware like
+         * rs232-pcmcia card or usb-serial...
+         *
+         * priv->tty = NULL?;
+         */
+
+        /* we are dead now */
+        tty->disc_data = NULL;
+
+        sirdev_put_instance(priv->dev);
+
+        /* Stop tty */
+        irtty_stop_receiver(tty, TRUE);
+        tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
+        if (tty->driver->stop)
+                tty->driver->stop(tty);
+
+        kfree(priv);
+
+        IRDA_DEBUG(0, "%s - %s: irda line discipline closed\n", __FUNCTION__, tty->name);
+}
+
+/* ------------------------------------------------------- */
+
+static struct tty_ldisc irda_ldisc = {
+        .magic          = TTY_LDISC_MAGIC,
+        .name           = "irda",
+        .flags          = 0,
+        .open           = irtty_open,
+        .close          = irtty_close,
+        .read           = NULL,
+        .write          = NULL,
+        .ioctl          = irtty_ioctl,
+        .poll           = NULL,
+        .receive_buf    = irtty_receive_buf,
+        .receive_room   = irtty_receive_room,
+        .write_wakeup   = irtty_write_wakeup,
+        .owner          = THIS_MODULE,
+};
+
+/* ------------------------------------------------------- */
+
+static int __init irtty_sir_init(void)
+{
+        int err;
+
+        if ((err = tty_register_ldisc(N_IRDA, &irda_ldisc)) != 0)
+                IRDA_ERROR("IrDA: can't register line discipline (err = %d)\n",
+                           err);
+        return err;
+}
+
+static void __exit irtty_sir_cleanup(void) 
+{
+        int err;
+
+        if ((err = tty_register_ldisc(N_IRDA, NULL))) {
+                IRDA_ERROR("%s(), can't unregister line discipline (err = %d)\n",
+                           __FUNCTION__, err);
+        }
+}
+
+module_init(irtty_sir_init);
+module_exit(irtty_sir_cleanup);
+
+MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
+MODULE_DESCRIPTION("IrDA TTY device driver");
+MODULE_ALIAS_LDISC(N_IRDA);
+MODULE_LICENSE("GPL");
+