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path: root/drivers/net/irda/stir4200.c
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Diffstat (limited to 'drivers/net/irda/stir4200.c')
-rw-r--r--drivers/net/irda/stir4200.c1134
1 files changed, 0 insertions, 1134 deletions
diff --git a/drivers/net/irda/stir4200.c b/drivers/net/irda/stir4200.c
deleted file mode 100644
index ee2cb70b688d..000000000000
--- a/drivers/net/irda/stir4200.c
+++ /dev/null
@@ -1,1134 +0,0 @@
-/*****************************************************************************
-*
-* 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.
-*
-* 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/sched/signal.h>
-#include <linux/ktime.h>
-#include <linux/types.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 <linux/kthread.h>
-#include <linux/freezer.h>
-#include <net/irda/irda.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@linux-foundation.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_DIR = 0x10,
- FIFOCTL_CLR = 0x08,
- FIFOCTL_EMPTY = 0x04,
-};
-
-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 qos_info qos;
- unsigned speed; /* Current speed */
-
- struct task_struct *thread; /* transmit thread */
-
- struct sk_buff *tx_pending;
- void *io_buf; /* transmit/receive buffer */
- __u8 *fifo_status;
-
- iobuff_t rx_buff; /* receive unwrap state machine */
- ktime_t rx_time;
- int receiving;
- struct urb *rx_urb;
-};
-
-
-/* These are the currently known USB ids */
-static const 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->netdev->stats.rx_errors;
- ++stir->netdev->stats.rx_length_errors;
- return;
- }
-
- fcs = ~(crc32_le(~0, rx_buff->data, len));
- if (fcs != get_unaligned_le32(rx_buff->data + len)) {
- pr_debug("crc error calc 0x%x len %d\n", fcs, len);
- stir->netdev->stats.rx_errors++;
- stir->netdev->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->netdev->stats.rx_dropped;
- return;
- }
- skb_reserve(nskb, 1);
- skb = nskb;
- skb_copy_to_linear_data(nskb, rx_buff->data, len);
- } else {
- nskb = dev_alloc_skb(rx_buff->truesize);
- if (unlikely(!nskb)) {
- ++stir->netdev->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_reset_mac_header(skb);
- skb->protocol = htons(ETH_P_IRDA);
- skb->dev = stir->netdev;
-
- netif_rx(skb);
-
- stir->netdev->stats.rx_packets++;
- stir->netdev->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->netdev->stats.rx_over_errors;
- goto error_recovery;
- }
-
- rx_buff->data[rx_buff->len++] = byte;
- continue;
-
- frame_error:
- ++stir->netdev->stats.rx_frame_errors;
-
- error_recovery:
- ++stir->netdev->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->netdev->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;
- }
-
- dev_warn(&stir->netdev->dev, "invalid speed %d\n", 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 netdev_tx_t 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_process(stir->thread);
-
- /* this should never happen unless stop/wakeup problem */
- if (unlikely(skb)) {
- WARN_ON(1);
- dev_kfree_skb(skb);
- }
-
- return NETDEV_TX_OK;
-}
-
-/*
- * 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;
- unsigned long prev_count = 0x1fff;
-
- /* Read FIFO status and count */
- for (;; prev_count = count) {
- err = read_reg(stir, REG_FIFOCTL, stir->fifo_status,
- FIFO_REGS_SIZE);
- if (unlikely(err != FIFO_REGS_SIZE)) {
- dev_warn(&stir->netdev->dev,
- "FIFO register read error: %d\n", 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);
-
- /* 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;
-
- /* queue confused */
- if (prev_count < count)
- break;
-
- /* 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;
-
- if (us <= 0)
- return;
-
- us -= ktime_us_delta(ktime_get(), stir->rx_time);
-
- if (us < 10)
- return;
-
- ticks = us / (1000000 / HZ);
- if (ticks > 0)
- schedule_timeout_interruptible(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->netdev->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->netdev->stats.tx_packets++;
- stir->netdev->stats.tx_bytes += skb->len;
- netif_trans_update(stir->netdev);
- 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->netdev->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;
-
- while (!kthread_should_stop()) {
-#ifdef CONFIG_PM
- /* if suspending, then power off and wait */
- if (unlikely(freezing(current))) {
- if (stir->receiving)
- receive_stop(stir);
- else
- fifo_txwait(stir, -1);
-
- write_reg(stir, REG_CTRL1, CTRL1_TXPWD|CTRL1_RXPWD);
-
- try_to_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())
- dev_info(&dev->dev,
- "%s: receive usb submit failed\n",
- stir->netdev->name);
- stir->receiving = 0;
- msleep(10);
- continue;
- }
- }
-
- /* sleep if nothing to send */
- set_current_state(TASK_INTERRUPTIBLE);
- schedule();
-
- }
- return 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 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->rx_time = ktime_get();
- }
-
- /* 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) {
- dev_warn(&stir->netdev->dev, "usb receive submit error: %d\n",
- err);
- stir->receiving = 0;
- wake_up_process(stir->thread);
- }
-}
-
-/*
- * 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;
- stir->rx_time = ktime_get();
-
- 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) {
- dev_err(&stir->usbdev->dev, "irlap_open failed\n");
- goto err_out5;
- }
-
- /** Start kernel thread for transmit. */
- stir->thread = kthread_run(stir_transmit_thread, stir,
- "%s", stir->netdev->name);
- if (IS_ERR(stir->thread)) {
- err = PTR_ERR(stir->thread);
- dev_err(&stir->usbdev->dev, "unable to start kernel thread\n");
- 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 */
- kthread_stop(stir->thread);
- 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;
-}
-
-static const struct net_device_ops stir_netdev_ops = {
- .ndo_open = stir_net_open,
- .ndo_stop = stir_net_close,
- .ndo_start_xmit = stir_hard_xmit,
- .ndo_do_ioctl = stir_net_ioctl,
-};
-
-/*
- * 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_NETDEV_DEV(net, &intf->dev);
- stir = netdev_priv(net);
- stir->netdev = net;
- stir->usbdev = dev;
-
- ret = usb_reset_configuration(dev);
- if (ret != 0) {
- dev_err(&intf->dev, "usb reset configuration failed\n");
- 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);
-
- /* Override the network functions we need to use */
- net->netdev_ops = &stir_netdev_ops;
-
- ret = register_netdev(net);
- if (ret != 0)
- goto err_out2;
-
- dev_info(&intf->dev, "IrDA: Registered SigmaTel device %s\n",
- 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
-/* USB suspend, so power off the transmitter/receiver */
-static int stir_suspend(struct usb_interface *intf, pm_message_t message)
-{
- 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 = {
- .name = "stir4200",
- .probe = stir_probe,
- .disconnect = stir_disconnect,
- .id_table = dongles,
-#ifdef CONFIG_PM
- .suspend = stir_suspend,
- .resume = stir_resume,
-#endif
-};
-
-module_usb_driver(irda_driver);