/***************************************************************************** * * 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/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 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);