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, 1184 insertions, 0 deletions

diff --git a/drivers/net/irda/stir4200.c b/drivers/net/irda/stir4200.c
new file mode 100644
index 000000000000..83c605e8824c
--- /dev/null
+++ b/drivers/net/irda/stir4200.c
@@ -0,0 +1,1184 @@
+/*****************************************************************************
+*
+* Filename:      stir4200.c
+* Version:       0.4
+* Description:   Irda SigmaTel USB Dongle
+* Status:        Experimental
+* Author:        Stephen Hemminger <shemminger@osdl.org>
+*
+*       Based on earlier driver by Paul Stewart <stewart@parc.com>
+*
+*       Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
+*       Copyright (C) 2001, Dag Brattli <dag@brattli.net>
+*       Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
+*       Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
+*
+*       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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*
+*****************************************************************************/
+
+/*
+ * This dongle does no framing, and requires polling to receive the
+ * data.  The STIr4200 has bulk in and out endpoints just like
+ * usr-irda devices, but the data it sends and receives is raw; like
+ * irtty, it needs to call the wrap and unwrap functions to add and
+ * remove SOF/BOF and escape characters to/from the frame.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/usb.h>
+#include <linux/crc32.h>
+#include <net/irda/irda.h>
+#include <net/irda/irlap.h>
+#include <net/irda/irda_device.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/crc.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+
+MODULE_AUTHOR("Stephen Hemminger <shemminger@osdl.org>");
+MODULE_DESCRIPTION("IrDA-USB Dongle Driver for SigmaTel STIr4200");
+MODULE_LICENSE("GPL");
+
+static int qos_mtt_bits = 0x07; /* 1 ms or more */
+module_param(qos_mtt_bits, int, 0);
+MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
+
+static int rx_sensitivity = 1;  /* FIR 0..4, SIR 0..6 */
+module_param(rx_sensitivity, int, 0);
+MODULE_PARM_DESC(rx_sensitivity, "Set Receiver sensitivity (0-6, 0 is most sensitive)");
+
+static int tx_power = 0;        /* 0 = highest ... 3 = lowest */
+module_param(tx_power, int, 0);
+MODULE_PARM_DESC(tx_power, "Set Transmitter power (0-3, 0 is highest power)");
+
+#define STIR_IRDA_HEADER        4
+#define CTRL_TIMEOUT            100        /* milliseconds */
+#define TRANSMIT_TIMEOUT        200        /* milliseconds */
+#define STIR_FIFO_SIZE          4096
+#define FIFO_REGS_SIZE          3
+
+enum FirChars {
+        FIR_CE   = 0x7d,
+        FIR_XBOF = 0x7f,
+        FIR_EOF  = 0x7e,
+};
+
+enum StirRequests {
+        REQ_WRITE_REG =         0x00,
+        REQ_READ_REG =          0x01,
+        REQ_READ_ROM =          0x02,
+        REQ_WRITE_SINGLE =      0x03,
+};
+
+/* Register offsets */
+enum StirRegs {
+        REG_RSVD=0,
+        REG_MODE,
+        REG_PDCLK,
+        REG_CTRL1,
+        REG_CTRL2,
+        REG_FIFOCTL,
+        REG_FIFOLSB,
+        REG_FIFOMSB,
+        REG_DPLL,
+        REG_IRDIG,
+        REG_TEST=15,
+};
+
+enum StirModeMask {
+        MODE_FIR = 0x80,
+        MODE_SIR = 0x20,
+        MODE_ASK = 0x10,
+        MODE_FASTRX = 0x08,
+        MODE_FFRSTEN = 0x04,
+        MODE_NRESET = 0x02,
+        MODE_2400 = 0x01,
+};
+
+enum StirPdclkMask {
+        PDCLK_4000000 = 0x02,
+        PDCLK_115200 = 0x09,
+        PDCLK_57600 = 0x13,
+        PDCLK_38400 = 0x1D,
+        PDCLK_19200 = 0x3B,
+        PDCLK_9600 = 0x77,
+        PDCLK_2400 = 0xDF,
+};
+
+enum StirCtrl1Mask {
+        CTRL1_SDMODE = 0x80,
+        CTRL1_RXSLOW = 0x40,
+        CTRL1_TXPWD = 0x10,
+        CTRL1_RXPWD = 0x08,
+        CTRL1_SRESET = 0x01,
+};
+
+enum StirCtrl2Mask {
+        CTRL2_SPWIDTH = 0x08,
+        CTRL2_REVID = 0x03,
+};
+
+enum StirFifoCtlMask {
+        FIFOCTL_EOF = 0x80,
+        FIFOCTL_UNDER = 0x40,
+        FIFOCTL_OVER = 0x20,
+        FIFOCTL_DIR = 0x10,
+        FIFOCTL_CLR = 0x08,
+        FIFOCTL_EMPTY = 0x04,
+        FIFOCTL_RXERR = 0x02,
+        FIFOCTL_TXERR = 0x01,
+};
+
+enum StirDiagMask {
+        IRDIG_RXHIGH = 0x80,
+        IRDIG_RXLOW = 0x40,
+};
+
+enum StirTestMask {
+        TEST_PLLDOWN = 0x80,
+        TEST_LOOPIR = 0x40,
+        TEST_LOOPUSB = 0x20,
+        TEST_TSTENA = 0x10,
+        TEST_TSTOSC = 0x0F,
+};
+
+struct stir_cb {
+        struct usb_device *usbdev;      /* init: probe_irda */
+        struct net_device *netdev;      /* network layer */
+        struct irlap_cb   *irlap;       /* The link layer we are binded to */
+        struct net_device_stats stats;  /* network statistics */
+        struct qos_info   qos;
+        unsigned          speed;        /* Current speed */
+
+        wait_queue_head_t thr_wait;     /* transmit thread wakeup */
+        struct completion thr_exited;
+        pid_t             thr_pid;
+
+        struct sk_buff    *tx_pending;
+        void              *io_buf;      /* transmit/receive buffer */
+        __u8              *fifo_status;
+
+        iobuff_t          rx_buff;      /* receive unwrap state machine */
+        struct timeval    rx_time;
+        int               receiving;
+        struct urb       *rx_urb;
+};
+
+
+/* These are the currently known USB ids */
+static struct usb_device_id dongles[] = {
+    /* SigmaTel, Inc,  STIr4200 IrDA/USB Bridge */
+    { USB_DEVICE(0x066f, 0x4200) },
+    { }
+};
+
+MODULE_DEVICE_TABLE(usb, dongles);
+
+/* Send control message to set dongle register */
+static int write_reg(struct stir_cb *stir, __u16 reg, __u8 value)
+{
+        struct usb_device *dev = stir->usbdev;
+
+        pr_debug("%s: write reg %d = 0x%x\n",
+                 stir->netdev->name, reg, value);
+        return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+                               REQ_WRITE_SINGLE,
+                               USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_DEVICE,
+                               value, reg, NULL, 0,
+                               CTRL_TIMEOUT);
+}
+
+/* Send control message to read multiple registers */
+static inline int read_reg(struct stir_cb *stir, __u16 reg,
+                    __u8 *data, __u16 count)
+{
+        struct usb_device *dev = stir->usbdev;
+
+        return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+                               REQ_READ_REG,
+                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+                               0, reg, data, count,
+                               CTRL_TIMEOUT);
+}
+
+static inline int isfir(u32 speed)
+{
+        return (speed == 4000000);
+}
+
+/*
+ * Prepare a FIR IrDA frame for transmission to the USB dongle.  The
+ * FIR transmit frame is documented in the datasheet.  It consists of
+ * a two byte 0x55 0xAA sequence, two little-endian length bytes, a
+ * sequence of exactly 16 XBOF bytes of 0x7E, two BOF bytes of 0x7E,
+ * then the data escaped as follows:
+ *
+ *    0x7D -> 0x7D 0x5D
+ *    0x7E -> 0x7D 0x5E
+ *    0x7F -> 0x7D 0x5F
+ *
+ * Then, 4 bytes of little endian (stuffed) FCS follow, then two
+ * trailing EOF bytes of 0x7E.
+ */
+static inline __u8 *stuff_fir(__u8 *p, __u8 c)
+{
+        switch(c) {
+        case 0x7d:
+        case 0x7e:
+        case 0x7f:
+                *p++ = 0x7d;
+                c ^= IRDA_TRANS;
+                /* fall through */
+        default:
+                *p++ = c;
+        }
+        return p;
+}
+
+/* Take raw data in skb and put it wrapped into buf */
+static unsigned wrap_fir_skb(const struct sk_buff *skb, __u8 *buf)
+{
+        __u8 *ptr = buf;
+        __u32 fcs = ~(crc32_le(~0, skb->data, skb->len));
+        __u16 wraplen;
+        int i;
+
+        /* Header */
+        buf[0] = 0x55;
+        buf[1] = 0xAA;
+
+        ptr = buf + STIR_IRDA_HEADER;
+        memset(ptr, 0x7f, 16);
+        ptr += 16;
+
+        /* BOF */
+        *ptr++  = 0x7e;
+        *ptr++  = 0x7e;
+
+        /* Address / Control / Information */
+        for (i = 0; i < skb->len; i++)
+                ptr = stuff_fir(ptr, skb->data[i]);
+
+        /* FCS */
+        ptr = stuff_fir(ptr, fcs & 0xff);
+        ptr = stuff_fir(ptr, (fcs >> 8) & 0xff);
+        ptr = stuff_fir(ptr, (fcs >> 16) & 0xff);
+        ptr = stuff_fir(ptr, (fcs >> 24) & 0xff);
+
+        /* EOFs */
+        *ptr++ = 0x7e;
+        *ptr++ = 0x7e;
+
+        /* Total length, minus the header */
+        wraplen = (ptr - buf) - STIR_IRDA_HEADER;
+        buf[2] = wraplen & 0xff;
+        buf[3] = (wraplen >> 8) & 0xff;
+
+        return wraplen + STIR_IRDA_HEADER;
+}
+
+static unsigned wrap_sir_skb(struct sk_buff *skb, __u8 *buf)
+{
+        __u16 wraplen;
+
+        wraplen = async_wrap_skb(skb, buf + STIR_IRDA_HEADER,
+                                 STIR_FIFO_SIZE - STIR_IRDA_HEADER);
+        buf[0] = 0x55;
+        buf[1] = 0xAA;
+        buf[2] = wraplen & 0xff;
+        buf[3] = (wraplen >> 8) & 0xff;
+
+        return wraplen + STIR_IRDA_HEADER;
+}
+
+/*
+ * Frame is fully formed in the rx_buff so check crc
+ * and pass up to irlap
+ * setup for next receive
+ */
+static void fir_eof(struct stir_cb *stir)
+{
+        iobuff_t *rx_buff = &stir->rx_buff;
+        int len = rx_buff->len - 4;
+        struct sk_buff *skb, *nskb;
+        __u32 fcs;
+
+        if (unlikely(len <= 0)) {
+                pr_debug("%s: short frame len %d\n",
+                         stir->netdev->name, len);
+
+                ++stir->stats.rx_errors;
+                ++stir->stats.rx_length_errors;
+                return;
+        }
+
+        fcs = ~(crc32_le(~0, rx_buff->data, len));
+        if (fcs != le32_to_cpu(get_unaligned((u32 *)(rx_buff->data+len)))) {
+                pr_debug("crc error calc 0x%x len %d\n", fcs, len);
+                stir->stats.rx_errors++;
+                stir->stats.rx_crc_errors++;
+                return;
+        }
+
+        /* if frame is short then just copy it */
+        if (len < IRDA_RX_COPY_THRESHOLD) {
+                nskb = dev_alloc_skb(len + 1);
+                if (unlikely(!nskb)) {
+                        ++stir->stats.rx_dropped;
+                        return;
+                }
+                skb_reserve(nskb, 1);
+                skb = nskb;
+                memcpy(nskb->data, rx_buff->data, len);
+        } else {
+                nskb = dev_alloc_skb(rx_buff->truesize);
+                if (unlikely(!nskb)) {
+                        ++stir->stats.rx_dropped;
+                        return;
+                }
+                skb_reserve(nskb, 1);
+                skb = rx_buff->skb;
+                rx_buff->skb = nskb;
+                rx_buff->head = nskb->data;
+        }
+
+        skb_put(skb, len);
+
+        skb->mac.raw  = skb->data;
+        skb->protocol = htons(ETH_P_IRDA);
+        skb->dev = stir->netdev;
+
+        netif_rx(skb);
+
+        stir->stats.rx_packets++;
+        stir->stats.rx_bytes += len;
+
+        rx_buff->data = rx_buff->head;
+        rx_buff->len = 0;
+}
+
+/* Unwrap FIR stuffed data and bump it to IrLAP */
+static void stir_fir_chars(struct stir_cb *stir,
+                            const __u8 *bytes, int len)
+{
+        iobuff_t *rx_buff = &stir->rx_buff;
+        int     i;
+
+        for (i = 0; i < len; i++) {
+                __u8    byte = bytes[i];
+
+                switch(rx_buff->state) {
+                case OUTSIDE_FRAME:
+                        /* ignore garbage till start of frame */
+                        if (unlikely(byte != FIR_EOF))
+                                continue;
+                        /* Now receiving frame */
+                        rx_buff->state = BEGIN_FRAME;
+
+                        /* Time to initialize receive buffer */
+                        rx_buff->data = rx_buff->head;
+                        rx_buff->len = 0;
+                        continue;
+
+                case LINK_ESCAPE:
+                        if (byte == FIR_EOF) {
+                                pr_debug("%s: got EOF after escape\n",
+                                         stir->netdev->name);
+                                goto frame_error;
+                        }
+                        rx_buff->state = INSIDE_FRAME;
+                        byte ^= IRDA_TRANS;
+                        break;
+
+                case BEGIN_FRAME:
+                        /* ignore multiple BOF/EOF */
+                        if (byte == FIR_EOF)
+                                continue;
+                        rx_buff->state = INSIDE_FRAME;
+                        rx_buff->in_frame = TRUE;
+
+                        /* fall through */
+                case INSIDE_FRAME:
+                        switch(byte) {
+                        case FIR_CE:
+                                rx_buff->state = LINK_ESCAPE;
+                                continue;
+                        case FIR_XBOF:
+                                /* 0x7f is not used in this framing */
+                                pr_debug("%s: got XBOF without escape\n",
+                                         stir->netdev->name);
+                                goto frame_error;
+                        case FIR_EOF:
+                                rx_buff->state = OUTSIDE_FRAME;
+                                rx_buff->in_frame = FALSE;
+                                fir_eof(stir);
+                                continue;
+                        }
+                        break;
+                }
+
+                /* add byte to rx buffer */
+                if (unlikely(rx_buff->len >= rx_buff->truesize)) {
+                        pr_debug("%s: fir frame exceeds %d\n",
+                                 stir->netdev->name, rx_buff->truesize);
+                        ++stir->stats.rx_over_errors;
+                        goto error_recovery;
+                }
+
+                rx_buff->data[rx_buff->len++] = byte;
+                continue;
+
+        frame_error:
+                ++stir->stats.rx_frame_errors;
+
+        error_recovery:
+                ++stir->stats.rx_errors;
+                rx_buff->state = OUTSIDE_FRAME;
+                rx_buff->in_frame = FALSE;
+        }
+}
+
+/* Unwrap SIR stuffed data and bump it up to IrLAP */
+static void stir_sir_chars(struct stir_cb *stir,
+                            const __u8 *bytes, int len)
+{
+        int i;
+
+        for (i = 0; i < len; i++)
+                async_unwrap_char(stir->netdev, &stir->stats,
+                                  &stir->rx_buff, bytes[i]);
+}
+
+static inline void unwrap_chars(struct stir_cb *stir,
+                                const __u8 *bytes, int length)
+{
+        if (isfir(stir->speed))
+                stir_fir_chars(stir, bytes, length);
+        else
+                stir_sir_chars(stir, bytes, length);
+}
+
+/* Mode parameters for each speed */
+static const struct {
+        unsigned speed;
+        __u8 pdclk;
+} stir_modes[] = {
+        { 2400,    PDCLK_2400 },
+        { 9600,    PDCLK_9600 },
+        { 19200,   PDCLK_19200 },
+        { 38400,   PDCLK_38400 },
+        { 57600,   PDCLK_57600 },
+        { 115200,  PDCLK_115200 },
+        { 4000000, PDCLK_4000000 },
+};
+
+
+/*
+ * Setup chip for speed.
+ *  Called at startup to initialize the chip
+ *  and on speed changes.
+ *
+ * Note: Write multiple registers doesn't appear to work
+ */
+static int change_speed(struct stir_cb *stir, unsigned speed)
+{
+        int i, err;
+        __u8 mode;
+
+        for (i = 0; i < ARRAY_SIZE(stir_modes); ++i) {
+                if (speed == stir_modes[i].speed)
+                        goto found;
+        }
+
+        warn("%s: invalid speed %d", stir->netdev->name, speed);
+        return -EINVAL;
+
+ found:
+        pr_debug("speed change from %d to %d\n", stir->speed, speed);
+
+        /* Reset modulator */
+        err = write_reg(stir, REG_CTRL1, CTRL1_SRESET);
+        if (err)
+                goto out;
+
+        /* Undocumented magic to tweak the DPLL */
+        err = write_reg(stir, REG_DPLL, 0x15);
+        if (err)
+                goto out;
+
+        /* Set clock */
+        err = write_reg(stir, REG_PDCLK, stir_modes[i].pdclk);
+        if (err)
+                goto out;
+
+        mode = MODE_NRESET | MODE_FASTRX;
+        if (isfir(speed))
+                mode |= MODE_FIR | MODE_FFRSTEN;
+        else
+                mode |= MODE_SIR;
+
+        if (speed == 2400)
+                mode |= MODE_2400;
+
+        err = write_reg(stir, REG_MODE, mode);
+        if (err)
+                goto out;
+
+        /* This resets TEMIC style transceiver if any. */
+        err = write_reg(stir, REG_CTRL1,
+                        CTRL1_SDMODE | (tx_power & 3) << 1);
+        if (err)
+                goto out;
+
+        err = write_reg(stir, REG_CTRL1, (tx_power & 3) << 1);
+        if (err)
+                goto out;
+
+        /* Reset sensitivity */
+        err = write_reg(stir, REG_CTRL2, (rx_sensitivity & 7) << 5);
+ out:
+        stir->speed = speed;
+        return err;
+}
+
+/*
+ * Called from net/core when new frame is available.
+ */
+static int stir_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
+{
+        struct stir_cb *stir = netdev_priv(netdev);
+
+        netif_stop_queue(netdev);
+
+        /* the IRDA wrapping routines don't deal with non linear skb */
+        SKB_LINEAR_ASSERT(skb);
+
+        skb = xchg(&stir->tx_pending, skb);
+        wake_up(&stir->thr_wait);
+        
+        /* this should never happen unless stop/wakeup problem */
+        if (unlikely(skb)) {
+                WARN_ON(1);
+                dev_kfree_skb(skb);
+        }
+
+        return 0;
+}
+
+/*
+ * Wait for the transmit FIFO to have space for next data
+ *
+ * If space < 0 then wait till FIFO completely drains.
+ * FYI: can take up to 13 seconds at 2400baud.
+ */
+static int fifo_txwait(struct stir_cb *stir, int space)
+{
+        int err;
+        unsigned long count, status;
+
+        /* Read FIFO status and count */
+        for(;;) {
+                err = read_reg(stir, REG_FIFOCTL, stir->fifo_status, 
+                                   FIFO_REGS_SIZE);
+                if (unlikely(err != FIFO_REGS_SIZE)) {
+                        warn("%s: FIFO register read error: %d", 
+                             stir->netdev->name, err);
+
+                        return err;
+                }
+
+                status = stir->fifo_status[0];
+                count = (unsigned)(stir->fifo_status[2] & 0x1f) << 8 
+                        | stir->fifo_status[1];
+
+                pr_debug("fifo status 0x%lx count %lu\n", status, count);
+
+                /* error when receive/transmit fifo gets confused */
+                if (status & FIFOCTL_RXERR) {
+                        stir->stats.rx_fifo_errors++;
+                        stir->stats.rx_errors++;
+                        break;
+                }
+
+                if (status & FIFOCTL_TXERR) {
+                        stir->stats.tx_fifo_errors++;
+                        stir->stats.tx_errors++;
+                        break;
+                }
+
+                /* is fifo receiving already, or empty */
+                if (!(status & FIFOCTL_DIR)
+                    || (status & FIFOCTL_EMPTY))
+                        return 0;
+
+                if (signal_pending(current))
+                        return -EINTR;
+
+                /* shutting down? */
+                if (!netif_running(stir->netdev)
+                    || !netif_device_present(stir->netdev))
+                        return -ESHUTDOWN;
+
+                /* only waiting for some space */
+                if (space >= 0 && STIR_FIFO_SIZE - 4 > space + count)
+                        return 0;
+
+                /* estimate transfer time for remaining chars */
+                msleep((count * 8000) / stir->speed);
+        }
+                        
+        err = write_reg(stir, REG_FIFOCTL, FIFOCTL_CLR);
+        if (err) 
+                return err;
+        err = write_reg(stir, REG_FIFOCTL, 0);
+        if (err)
+                return err;
+
+        return 0;
+}
+
+
+/* Wait for turnaround delay before starting transmit.  */
+static void turnaround_delay(const struct stir_cb *stir, long us)
+{
+        long ticks;
+        struct timeval now;
+
+        if (us <= 0)
+                return;
+
+        do_gettimeofday(&now);
+        if (now.tv_sec - stir->rx_time.tv_sec > 0)
+                us -= USEC_PER_SEC;
+        us -= now.tv_usec - stir->rx_time.tv_usec;
+        if (us < 10)
+                return;
+
+        ticks = us / (1000000 / HZ);
+        if (ticks > 0) {
+                current->state = TASK_INTERRUPTIBLE;
+                schedule_timeout(1 + ticks);
+        } else
+                udelay(us);
+}
+
+/*
+ * Start receiver by submitting a request to the receive pipe.
+ * If nothing is available it will return after rx_interval.
+ */
+static int receive_start(struct stir_cb *stir)
+{
+        /* reset state */
+        stir->receiving = 1;
+
+        stir->rx_buff.in_frame = FALSE;
+        stir->rx_buff.state = OUTSIDE_FRAME;
+
+        stir->rx_urb->status = 0;
+        return usb_submit_urb(stir->rx_urb, GFP_KERNEL);
+}
+
+/* Stop all pending receive Urb's */
+static void receive_stop(struct stir_cb *stir)
+{
+        stir->receiving = 0;
+        usb_kill_urb(stir->rx_urb);
+
+        if (stir->rx_buff.in_frame) 
+                stir->stats.collisions++;
+}
+/*
+ * Wrap data in socket buffer and send it.
+ */
+static void stir_send(struct stir_cb *stir, struct sk_buff *skb)
+{
+        unsigned wraplen;
+        int first_frame = 0;
+
+        /* if receiving, need to turnaround */
+        if (stir->receiving) {
+                receive_stop(stir);
+                turnaround_delay(stir, irda_get_mtt(skb));
+                first_frame = 1;
+        }
+
+        if (isfir(stir->speed))
+                wraplen = wrap_fir_skb(skb, stir->io_buf);
+        else
+                wraplen = wrap_sir_skb(skb, stir->io_buf);
+                
+        /* check for space available in fifo */
+        if (!first_frame)
+                fifo_txwait(stir, wraplen);
+
+        stir->stats.tx_packets++;
+        stir->stats.tx_bytes += skb->len;
+        stir->netdev->trans_start = jiffies;
+        pr_debug("send %d (%d)\n", skb->len, wraplen);
+
+        if (usb_bulk_msg(stir->usbdev, usb_sndbulkpipe(stir->usbdev, 1),
+                         stir->io_buf, wraplen,
+                         NULL, TRANSMIT_TIMEOUT))
+                stir->stats.tx_errors++;
+}
+
+/*
+ * Transmit state machine thread
+ */
+static int stir_transmit_thread(void *arg)
+{
+        struct stir_cb *stir = arg;
+        struct net_device *dev = stir->netdev;
+        struct sk_buff *skb;
+
+        daemonize("%s", dev->name);
+        allow_signal(SIGTERM);
+
+        while (netif_running(dev)
+               && netif_device_present(dev)
+               && !signal_pending(current))
+        {
+#ifdef CONFIG_PM
+                /* if suspending, then power off and wait */
+                if (unlikely(current->flags & PF_FREEZE)) {
+                        if (stir->receiving)
+                                receive_stop(stir);
+                        else
+                                fifo_txwait(stir, -1);
+
+                        write_reg(stir, REG_CTRL1, CTRL1_TXPWD|CTRL1_RXPWD);
+
+                        refrigerator(PF_FREEZE);
+
+                        if (change_speed(stir, stir->speed))
+                                break;
+                }
+#endif
+
+                /* if something to send? */
+                skb = xchg(&stir->tx_pending, NULL);
+                if (skb) {
+                        unsigned new_speed = irda_get_next_speed(skb);
+                        netif_wake_queue(dev);
+
+                        if (skb->len > 0)
+                                stir_send(stir, skb);
+                        dev_kfree_skb(skb);
+
+                        if ((new_speed != -1) && (stir->speed != new_speed)) {
+                                if (fifo_txwait(stir, -1) ||
+                                    change_speed(stir, new_speed))
+                                        break;
+                        }
+                        continue;
+                }
+
+                /* nothing to send? start receiving */
+                if (!stir->receiving 
+                    && irda_device_txqueue_empty(dev)) {
+                        /* Wait otherwise chip gets confused. */
+                        if (fifo_txwait(stir, -1))
+                                break;
+
+                        if (unlikely(receive_start(stir))) {
+                                if (net_ratelimit())
+                                        info("%s: receive usb submit failed",
+                                             stir->netdev->name);
+                                stir->receiving = 0;
+                                msleep(10);
+                                continue;
+                        }
+                }
+
+                /* sleep if nothing to send */
+                wait_event_interruptible(stir->thr_wait, stir->tx_pending);
+        }
+
+        complete_and_exit (&stir->thr_exited, 0);
+}
+
+
+/*
+ * USB bulk receive completion callback.
+ * Wakes up every ms (usb round trip) with wrapped 
+ * data.
+ */
+static void stir_rcv_irq(struct urb *urb, struct pt_regs *regs)
+{
+        struct stir_cb *stir = urb->context;
+        int err;
+
+        /* in process of stopping, just drop data */
+        if (!netif_running(stir->netdev))
+                return;
+
+        /* unlink, shutdown, unplug, other nasties */
+        if (urb->status != 0) 
+                return;
+
+        if (urb->actual_length > 0) {
+                pr_debug("receive %d\n", urb->actual_length);
+                unwrap_chars(stir, urb->transfer_buffer,
+                             urb->actual_length);
+                
+                stir->netdev->last_rx = jiffies;
+                do_gettimeofday(&stir->rx_time);
+        }
+
+        /* kernel thread is stopping receiver don't resubmit */
+        if (!stir->receiving)
+                return;
+
+        /* resubmit existing urb */
+        err = usb_submit_urb(urb, GFP_ATOMIC);
+
+        /* in case of error, the kernel thread will restart us */
+        if (err) {
+                warn("%s: usb receive submit error: %d",
+                        stir->netdev->name, err);
+                stir->receiving = 0;
+                wake_up(&stir->thr_wait);
+        }
+}
+
+/*
+ * Function stir_net_open (dev)
+ *
+ *    Network device is taken up. Usually this is done by "ifconfig irda0 up"
+ */
+static int stir_net_open(struct net_device *netdev)
+{
+        struct stir_cb *stir = netdev_priv(netdev);
+        int err;
+        char hwname[16];
+
+        err = usb_clear_halt(stir->usbdev, usb_sndbulkpipe(stir->usbdev, 1));
+        if (err)
+                goto err_out1;
+        err = usb_clear_halt(stir->usbdev, usb_rcvbulkpipe(stir->usbdev, 2));
+        if (err)
+                goto err_out1;
+
+        err = change_speed(stir, 9600);
+        if (err)
+                goto err_out1;
+
+        err = -ENOMEM;
+
+        /* Initialize for SIR/FIR to copy data directly into skb.  */
+        stir->receiving = 0;
+        stir->rx_buff.truesize = IRDA_SKB_MAX_MTU;
+        stir->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
+        if (!stir->rx_buff.skb) 
+                goto err_out1;
+
+        skb_reserve(stir->rx_buff.skb, 1);
+        stir->rx_buff.head = stir->rx_buff.skb->data;
+        do_gettimeofday(&stir->rx_time);
+
+        stir->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+        if (!stir->rx_urb) 
+                goto err_out2;
+
+        stir->io_buf = kmalloc(STIR_FIFO_SIZE, GFP_KERNEL);
+        if (!stir->io_buf)
+                goto err_out3;
+
+        usb_fill_bulk_urb(stir->rx_urb, stir->usbdev,
+                          usb_rcvbulkpipe(stir->usbdev, 2),
+                          stir->io_buf, STIR_FIFO_SIZE,
+                          stir_rcv_irq, stir);
+
+        stir->fifo_status = kmalloc(FIFO_REGS_SIZE, GFP_KERNEL);
+        if (!stir->fifo_status) 
+                goto err_out4;
+                
+        /*
+         * Now that everything should be initialized properly,
+         * Open new IrLAP layer instance to take care of us...
+         * Note : will send immediately a speed change...
+         */
+        sprintf(hwname, "usb#%d", stir->usbdev->devnum);
+        stir->irlap = irlap_open(netdev, &stir->qos, hwname);
+        if (!stir->irlap) {
+                err("stir4200: irlap_open failed");
+                goto err_out5;
+        }
+
+        /** Start kernel thread for transmit.  */
+        stir->thr_pid = kernel_thread(stir_transmit_thread, stir,
+                                      CLONE_FS|CLONE_FILES);
+        if (stir->thr_pid < 0) {
+                err = stir->thr_pid;
+                err("stir4200: unable to start kernel thread");
+                goto err_out6;
+        }
+
+        netif_start_queue(netdev);
+
+        return 0;
+
+ err_out6:
+        irlap_close(stir->irlap);
+ err_out5:
+        kfree(stir->fifo_status);
+ err_out4:
+        kfree(stir->io_buf);
+ err_out3:
+        usb_free_urb(stir->rx_urb);
+ err_out2:
+        kfree_skb(stir->rx_buff.skb);
+ err_out1:
+        return err;
+}
+
+/*
+ * Function stir_net_close (stir)
+ *
+ *    Network device is taken down. Usually this is done by
+ *    "ifconfig irda0 down"
+ */
+static int stir_net_close(struct net_device *netdev)
+{
+        struct stir_cb *stir = netdev_priv(netdev);
+
+        /* Stop transmit processing */
+        netif_stop_queue(netdev);
+
+        /* Kill transmit thread */
+        kill_proc(stir->thr_pid, SIGTERM, 1);
+        wait_for_completion(&stir->thr_exited);
+        kfree(stir->fifo_status);
+
+        /* Mop up receive urb's */
+        usb_kill_urb(stir->rx_urb);
+        
+        kfree(stir->io_buf);
+        usb_free_urb(stir->rx_urb);
+        kfree_skb(stir->rx_buff.skb);
+
+        /* Stop and remove instance of IrLAP */
+        if (stir->irlap)
+                irlap_close(stir->irlap);
+
+        stir->irlap = NULL;
+
+        return 0;
+}
+
+/*
+ * IOCTLs : Extra out-of-band network commands...
+ */
+static int stir_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
+{
+        struct if_irda_req *irq = (struct if_irda_req *) rq;
+        struct stir_cb *stir = netdev_priv(netdev);
+        int ret = 0;
+
+        switch (cmd) {
+        case SIOCSBANDWIDTH: /* Set bandwidth */
+                if (!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+
+                /* Check if the device is still there */
+                if (netif_device_present(stir->netdev))
+                        ret = change_speed(stir, irq->ifr_baudrate);
+                break;
+
+        case SIOCSMEDIABUSY: /* Set media busy */
+                if (!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+
+                /* Check if the IrDA stack is still there */
+                if (netif_running(stir->netdev))
+                        irda_device_set_media_busy(stir->netdev, TRUE);
+                break;
+
+        case SIOCGRECEIVING:
+                /* Only approximately true */
+                irq->ifr_receiving = stir->receiving;
+                break;
+
+        default:
+                ret = -EOPNOTSUPP;
+        }
+
+        return ret;
+}
+
+/*
+ * Get device stats (for /proc/net/dev and ifconfig)
+ */
+static struct net_device_stats *stir_net_get_stats(struct net_device *netdev)
+{
+        struct stir_cb *stir = netdev_priv(netdev);
+        return &stir->stats;
+}
+
+/*
+ * This routine is called by the USB subsystem for each new device
+ * in the system. We need to check if the device is ours, and in
+ * this case start handling it.
+ * Note : it might be worth protecting this function by a global
+ * spinlock... Or not, because maybe USB already deal with that...
+ */
+static int stir_probe(struct usb_interface *intf,
+                      const struct usb_device_id *id)
+{
+        struct usb_device *dev = interface_to_usbdev(intf);
+        struct stir_cb *stir = NULL;
+        struct net_device *net;
+        int ret = -ENOMEM;
+
+        /* Allocate network device container. */
+        net = alloc_irdadev(sizeof(*stir));
+        if(!net)
+                goto err_out1;
+
+        SET_MODULE_OWNER(net);
+        SET_NETDEV_DEV(net, &intf->dev);
+        stir = netdev_priv(net);
+        stir->netdev = net;
+        stir->usbdev = dev;
+
+        ret = usb_reset_configuration(dev);
+        if (ret != 0) {
+                err("stir4200: usb reset configuration failed");
+                goto err_out2;
+        }
+
+        printk(KERN_INFO "SigmaTel STIr4200 IRDA/USB found at address %d, "
+                "Vendor: %x, Product: %x\n",
+               dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
+               le16_to_cpu(dev->descriptor.idProduct));
+
+        /* Initialize QoS for this device */
+        irda_init_max_qos_capabilies(&stir->qos);
+
+        /* That's the Rx capability. */
+        stir->qos.baud_rate.bits       &= IR_2400 | IR_9600 | IR_19200 |
+                                         IR_38400 | IR_57600 | IR_115200 |
+                                         (IR_4000000 << 8);
+        stir->qos.min_turn_time.bits   &= qos_mtt_bits;
+        irda_qos_bits_to_value(&stir->qos);
+
+        init_completion (&stir->thr_exited);
+        init_waitqueue_head (&stir->thr_wait);
+
+        /* Override the network functions we need to use */
+        net->hard_start_xmit = stir_hard_xmit;
+        net->open            = stir_net_open;
+        net->stop            = stir_net_close;
+        net->get_stats       = stir_net_get_stats;
+        net->do_ioctl        = stir_net_ioctl;
+
+        ret = register_netdev(net);
+        if (ret != 0)
+                goto err_out2;
+
+        info("IrDA: Registered SigmaTel device %s", net->name);
+
+        usb_set_intfdata(intf, stir);
+
+        return 0;
+
+err_out2:
+        free_netdev(net);
+err_out1:
+        return ret;
+}
+
+/*
+ * The current device is removed, the USB layer tell us to shut it down...
+ */
+static void stir_disconnect(struct usb_interface *intf)
+{
+        struct stir_cb *stir = usb_get_intfdata(intf);
+
+        if (!stir)
+                return;
+
+        unregister_netdev(stir->netdev);
+        free_netdev(stir->netdev);
+
+        usb_set_intfdata(intf, NULL);
+}
+
+#ifdef CONFIG_PM
+/* Power management suspend, so power off the transmitter/receiver */
+static int stir_suspend(struct usb_interface *intf, u32 state)
+{
+        struct stir_cb *stir = usb_get_intfdata(intf);
+
+        netif_device_detach(stir->netdev);
+        return 0;
+}
+
+/* Coming out of suspend, so reset hardware */
+static int stir_resume(struct usb_interface *intf)
+{
+        struct stir_cb *stir = usb_get_intfdata(intf);
+
+        netif_device_attach(stir->netdev);
+
+        /* receiver restarted when send thread wakes up */
+        return 0;
+}
+#endif
+
+/*
+ * USB device callbacks
+ */
+static struct usb_driver irda_driver = {
+        .owner          = THIS_MODULE,
+        .name           = "stir4200",
+        .probe          = stir_probe,
+        .disconnect     = stir_disconnect,
+        .id_table       = dongles,
+#ifdef CONFIG_PM
+        .suspend        = stir_suspend,
+        .resume         = stir_resume,
+#endif
+};
+
+/*
+ * Module insertion
+ */
+static int __init stir_init(void)
+{
+        return usb_register(&irda_driver);
+}
+module_init(stir_init);
+
+/*
+ * Module removal
+ */
+static void __exit stir_cleanup(void)
+{
+        /* Deregister the driver and remove all pending instances */
+        usb_deregister(&irda_driver);
+}
+module_exit(stir_cleanup);