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authorSamuel Ortiz <samuel@sortiz.org>2006-05-25 16:19:22 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-17 21:26:18 -0700
commitc6ae522e3a50fc1ec483d7f03ece9c7a25e6de95 (patch)
tree98a67649b473bfc64751458283aeb3bb47e76703 /drivers/net/irda/mcs7780.c
parent15986e1aadbbf40a331cddd0470bb434d156431d (diff)
[IRDA]: Initial support for MCS7780 based dongles
The MosChip MCS7780 chipset is an IrDA USB bridge that doesn't conform with the IrDA-USB standard and thus needs its separate driver. Tested on an actual MCS7780 based dongle. Original implementation by Brian Pugh <bpugh@cs.pdx.edu> Signed-off-by: Samuel Ortiz <samuel@sortiz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/irda/mcs7780.c')
-rw-r--r--drivers/net/irda/mcs7780.c1009
1 files changed, 1009 insertions, 0 deletions
diff --git a/drivers/net/irda/mcs7780.c b/drivers/net/irda/mcs7780.c
new file mode 100644
index 00000000000..754297fc8f2
--- /dev/null
+++ b/drivers/net/irda/mcs7780.c
@@ -0,0 +1,1009 @@
+/*****************************************************************************
+*
+* Filename: mcs7780.c
+* Version: 0.4-alpha
+* Description: Irda MosChip USB Dongle Driver
+* Authors: Lukasz Stelmach <stlman@poczta.fm>
+* Brian Pugh <bpugh@cs.pdx.edu>
+* Judy Fischbach <jfisch@cs.pdx.edu>
+*
+* Based on stir4200 driver, but some things done differently.
+* 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>
+* Copyright (C) 2005, Lukasz Stelmach <stlman@poczta.fm>
+* Copyright (C) 2005, Brian Pugh <bpugh@cs.pdx.edu>
+* Copyright (C) 2005, Judy Fischbach <jfisch@cs.pdx.edu>
+*
+* 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.
+*
+*****************************************************************************/
+
+/*
+ * MCS7780 is a simple USB to IrDA bridge by MosChip. It is neither
+ * compatibile with irda-usb nor with stir4200. Although it is quite
+ * similar to the later as far as general idea of operation is concerned.
+ * That is it requires the software to do all the framing job at SIR speeds.
+ * The hardware does take care of the framing at MIR and FIR speeds.
+ * It supports all speeds from 2400 through 4Mbps
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kref.h>
+#include <linux/usb.h>
+#include <linux/device.h>
+#include <linux/crc32.h>
+
+#include <asm/unaligned.h>
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/crc.h>
+
+#include "mcs7780.h"
+
+#define MCS_VENDOR_ID 0x9710
+#define MCS_PRODUCT_ID 0x7780
+
+static struct usb_device_id mcs_table[] = {
+ /* MosChip Corp., MCS7780 FIR-USB Adapter */
+ {USB_DEVICE(MCS_VENDOR_ID, MCS_PRODUCT_ID)},
+ {},
+};
+
+MODULE_AUTHOR("Brian Pugh <bpugh@cs.pdx.edu>");
+MODULE_DESCRIPTION("IrDA-USB Dongle Driver for MosChip MCS7780");
+MODULE_VERSION("0.3alpha");
+MODULE_LICENSE("GPL");
+
+MODULE_DEVICE_TABLE(usb, mcs_table);
+
+static int qos_mtt_bits = 0x07 /* > 1ms */ ;
+module_param(qos_mtt_bits, int, 0);
+MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
+
+static int receive_mode = 0x1;
+module_param(receive_mode, int, 0);
+MODULE_PARM_DESC(receive_mode,
+ "Receive mode of the device (1:fast, 0:slow, default:1)");
+
+static int sir_tweak = 1;
+module_param(sir_tweak, int, 0444);
+MODULE_PARM_DESC(sir_tweak,
+ "Default pulse width (1:1.6us, 0:3/16 bit, default:1).");
+
+static int transceiver_type = MCS_TSC_VISHAY;
+module_param(transceiver_type, int, 0444);
+MODULE_PARM_DESC(transceiver_type, "IR transceiver type, see mcs7780.h.");
+
+struct usb_driver mcs_driver = {
+ .name = "mcs7780",
+ .probe = mcs_probe,
+ .disconnect = mcs_disconnect,
+ .id_table = mcs_table,
+};
+
+/* speed flag selection by direct addressing.
+addr = (speed >> 8) & 0x0f
+
+0x1 57600 0x2 115200 0x4 1152000 0x5 9600
+0x6 38400 0x9 2400 0xa 576000 0xb 19200
+
+4Mbps (or 2400) must be checked separately. Since it also has
+to be programmed in a different manner that is not a big problem.
+*/
+static __u16 mcs_speed_set[16] = { 0,
+ MCS_SPEED_57600,
+ MCS_SPEED_115200,
+ 0,
+ MCS_SPEED_1152000,
+ MCS_SPEED_9600,
+ MCS_SPEED_38400,
+ 0, 0,
+ MCS_SPEED_2400,
+ MCS_SPEED_576000,
+ MCS_SPEED_19200,
+ 0, 0, 0,
+};
+
+/* Set given 16 bit register with a 16 bit value. Send control message
+ * to set dongle register. */
+static int mcs_set_reg(struct mcs_cb *mcs, __u16 reg, __u16 val)
+{
+ struct usb_device *dev = mcs->usbdev;
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
+ MCS_WR_RTYPE, val, reg, NULL, 0,
+ msecs_to_jiffies(MCS_CTRL_TIMEOUT));
+}
+
+/* Get 16 bit register value. Send contol message to read dongle register. */
+static int mcs_get_reg(struct mcs_cb *mcs, __u16 reg, __u16 * val)
+{
+ struct usb_device *dev = mcs->usbdev;
+ int ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
+ MCS_RD_RTYPE, 0, reg, val, 2,
+ msecs_to_jiffies(MCS_CTRL_TIMEOUT));
+
+ return ret;
+}
+
+/* Setup a communication between mcs7780 and TFDU chips. It is described
+ * in more detail in the data sheet. The setup sequence puts the the
+ * vishay tranceiver into high speed mode. It will also receive SIR speed
+ * packets but at reduced sensitivity.
+ */
+
+/* 0: OK 1:ERROR */
+static inline int mcs_setup_transceiver_vishay(struct mcs_cb *mcs)
+{
+ int ret = 0;
+ __u16 rval;
+
+ /* mcs_get_reg should read exactly two bytes from the dongle */
+ ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval);
+ if (unlikely(ret != 2)) {
+ ret = -EIO;
+ goto error;
+ }
+
+ /* The MCS_XCVR_CONF bit puts the transceiver into configuration
+ * mode. The MCS_MODE0 bit must start out high (1) and then
+ * transition to low and the MCS_STFIR and MCS_MODE1 bits must
+ * be low.
+ */
+ rval |= (MCS_MODE0 | MCS_XCVR_CONF);
+ rval &= ~MCS_STFIR;
+ rval &= ~MCS_MODE1;
+ ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
+ if (unlikely(ret))
+ goto error;
+
+ rval &= ~MCS_MODE0;
+ ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
+ if (unlikely(ret))
+ goto error;
+
+ rval &= ~MCS_XCVR_CONF;
+ ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
+ if (unlikely(ret))
+ goto error;
+
+ ret = 0;
+ error:
+ return ret;
+}
+
+/* Setup a communication between mcs7780 and agilent chip. */
+static inline int mcs_setup_transceiver_agilent(struct mcs_cb *mcs)
+{
+ IRDA_WARNING("This transceiver type is not supported yet.");
+ return 1;
+}
+
+/* Setup a communication between mcs7780 and sharp chip. */
+static inline int mcs_setup_transceiver_sharp(struct mcs_cb *mcs)
+{
+ IRDA_WARNING("This transceiver type is not supported yet.");
+ return 1;
+}
+
+/* Common setup for all transceivers */
+static inline int mcs_setup_transceiver(struct mcs_cb *mcs)
+{
+ int ret = 0;
+ __u16 rval;
+ char *msg;
+
+ msg = "Basic transceiver setup error.";
+
+ /* read value of MODE Register, set the DRIVER and RESET bits
+ * and write value back out to MODE Register
+ */
+ ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
+ if(unlikely(ret != 2))
+ goto error;
+ rval |= MCS_DRIVER; /* put the mcs7780 into configuration mode. */
+ ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
+ if(unlikely(ret))
+ goto error;
+
+ rval = 0; /* set min pulse width to 0 initially. */
+ ret = mcs_set_reg(mcs, MCS_MINRXPW_REG, rval);
+ if(unlikely(ret))
+ goto error;
+
+ ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
+ if(unlikely(ret != 2))
+ goto error;
+
+ rval &= ~MCS_FIR; /* turn off fir mode. */
+ if(mcs->sir_tweak)
+ rval |= MCS_SIR16US; /* 1.6us pulse width */
+ else
+ rval &= ~MCS_SIR16US; /* 3/16 bit time pulse width */
+
+ /* make sure ask mode and back to back packets are off. */
+ rval &= ~(MCS_BBTG | MCS_ASK);
+
+ rval &= ~MCS_SPEED_MASK;
+ rval |= MCS_SPEED_9600; /* make sure initial speed is 9600. */
+ mcs->speed = 9600;
+ mcs->new_speed = 0; /* new_speed is set to 0 */
+ rval &= ~MCS_PLLPWDN; /* disable power down. */
+
+ /* make sure device determines direction and that the auto send sip
+ * pulse are on.
+ */
+ rval |= MCS_DTD | MCS_SIPEN;
+
+ ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
+ if(unlikely(ret))
+ goto error;
+
+ msg = "transceiver model specific setup error.";
+ switch (mcs->transceiver_type) {
+ case MCS_TSC_VISHAY:
+ ret = mcs_setup_transceiver_vishay(mcs);
+ break;
+
+ case MCS_TSC_SHARP:
+ ret = mcs_setup_transceiver_sharp(mcs);
+ break;
+
+ case MCS_TSC_AGILENT:
+ ret = mcs_setup_transceiver_agilent(mcs);
+ break;
+
+ default:
+ IRDA_WARNING("Unknown transceiver type: %d",
+ mcs->transceiver_type);
+ ret = 1;
+ }
+ if (unlikely(ret))
+ goto error;
+
+ /* If transceiver is not SHARP, then if receive mode set
+ * on the RXFAST bit in the XCVR Register otherwise unset it
+ */
+ if (mcs->transceiver_type != MCS_TSC_SHARP) {
+
+ ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval);
+ if (unlikely(ret != 2))
+ goto error;
+ if (mcs->receive_mode)
+ rval |= MCS_RXFAST;
+ else
+ rval &= ~MCS_RXFAST;
+ ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
+ if (unlikely(ret))
+ goto error;
+ }
+
+ msg = "transceiver reset.";
+
+ ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
+ if (unlikely(ret != 2))
+ goto error;
+
+ /* reset the mcs7780 so all changes take effect. */
+ rval &= ~MCS_RESET;
+ ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
+ if (unlikely(ret))
+ goto error;
+ else
+ return ret;
+
+error:
+ IRDA_ERROR("%s", msg);
+ return ret;
+}
+
+/* Wraps the data in format for SIR */
+static inline int mcs_wrap_sir_skb(struct sk_buff *skb, __u8 * buf)
+{
+ int wraplen;
+
+ /* 2: full frame length, including "the length" */
+ wraplen = async_wrap_skb(skb, buf + 2, 4094);
+
+ wraplen += 2;
+ buf[0] = wraplen & 0xff;
+ buf[1] = (wraplen >> 8) & 0xff;
+
+ return wraplen;
+}
+
+/* Wraps the data in format for FIR */
+static unsigned mcs_wrap_fir_skb(const struct sk_buff *skb, __u8 *buf)
+{
+ unsigned int len = 0;
+ __u32 fcs = ~(crc32_le(~0, skb->data, skb->len));
+
+ /* add 2 bytes for length value and 4 bytes for fcs. */
+ len = skb->len + 6;
+
+ /* The mcs7780 requires that the first two bytes are the packet
+ * length in little endian order. Note: the length value includes
+ * the two bytes for the length value itself.
+ */
+ buf[0] = len & 0xff;
+ buf[1] = (len >> 8) & 0xff;
+ /* copy the data into the tx buffer. */
+ memcpy(buf+2, skb->data, skb->len);
+ /* put the fcs in the last four bytes in little endian order. */
+ buf[len - 4] = fcs & 0xff;
+ buf[len - 3] = (fcs >> 8) & 0xff;
+ buf[len - 2] = (fcs >> 16) & 0xff;
+ buf[len - 1] = (fcs >> 24) & 0xff;
+
+ return len;
+}
+
+/* Wraps the data in format for MIR */
+static unsigned mcs_wrap_mir_skb(const struct sk_buff *skb, __u8 *buf)
+{
+ __u16 fcs = 0;
+ int len = skb->len + 4;
+
+ fcs = ~(irda_calc_crc16(~fcs, skb->data, skb->len));
+ /* put the total packet length in first. Note: packet length
+ * value includes the two bytes that hold the packet length
+ * itself.
+ */
+ buf[0] = len & 0xff;
+ buf[1] = (len >> 8) & 0xff;
+ /* copy the data */
+ memcpy(buf+2, skb->data, skb->len);
+ /* put the fcs in last two bytes in little endian order. */
+ buf[len - 2] = fcs & 0xff;
+ buf[len - 1] = (fcs >> 8) & 0xff;
+
+ return len;
+}
+
+/* Unwrap received packets at MIR speed. A 16 bit crc_ccitt checksum is
+ * used for the fcs. When performed over the entire packet the result
+ * should be GOOD_FCS = 0xf0b8. Hands the unwrapped data off to the IrDA
+ * layer via a sk_buff.
+ */
+static void mcs_unwrap_mir(struct mcs_cb *mcs, __u8 *buf, int len)
+{
+ __u16 fcs;
+ int new_len;
+ struct sk_buff *skb;
+
+ /* Assume that the frames are going to fill a single packet
+ * rather than span multiple packets.
+ */
+
+ new_len = len - 2;
+ if(unlikely(new_len <= 0)) {
+ IRDA_ERROR("%s short frame length %d\n",
+ mcs->netdev->name, new_len);
+ ++mcs->stats.rx_errors;
+ ++mcs->stats.rx_length_errors;
+ return;
+ }
+ fcs = 0;
+ fcs = irda_calc_crc16(~fcs, buf, len);
+
+ if(fcs != GOOD_FCS) {
+ IRDA_ERROR("crc error calc 0x%x len %d\n",
+ fcs, new_len);
+ mcs->stats.rx_errors++;
+ mcs->stats.rx_crc_errors++;
+ return;
+ }
+
+ skb = dev_alloc_skb(new_len + 1);
+ if(unlikely(!skb)) {
+ ++mcs->stats.rx_dropped;
+ return;
+ }
+
+ skb_reserve(skb, 1);
+ memcpy(skb->data, buf, new_len);
+ skb_put(skb, new_len);
+ skb->mac.raw = skb->data;
+ skb->protocol = htons(ETH_P_IRDA);
+ skb->dev = mcs->netdev;
+
+ netif_rx(skb);
+
+ mcs->stats.rx_packets++;
+ mcs->stats.rx_bytes += new_len;
+
+ return;
+}
+
+/* Unwrap received packets at FIR speed. A 32 bit crc_ccitt checksum is
+ * used for the fcs. Hands the unwrapped data off to the IrDA
+ * layer via a sk_buff.
+ */
+static void mcs_unwrap_fir(struct mcs_cb *mcs, __u8 *buf, int len)
+{
+ __u32 fcs;
+ int new_len;
+ struct sk_buff *skb;
+
+ /* Assume that the frames are going to fill a single packet
+ * rather than span multiple packets. This is most likely a false
+ * assumption.
+ */
+
+ new_len = len - 4;
+ if(unlikely(new_len <= 0)) {
+ IRDA_ERROR("%s short frame length %d\n",
+ mcs->netdev->name, new_len);
+ ++mcs->stats.rx_errors;
+ ++mcs->stats.rx_length_errors;
+ return;
+ }
+
+ fcs = ~(crc32_le(~0, buf, new_len));
+ if(fcs != le32_to_cpu(get_unaligned((u32 *)(buf+new_len)))) {
+ IRDA_ERROR("crc error calc 0x%x len %d\n", fcs, new_len);
+ mcs->stats.rx_errors++;
+ mcs->stats.rx_crc_errors++;
+ return;
+ }
+
+ skb = dev_alloc_skb(new_len + 1);
+ if(unlikely(!skb)) {
+ ++mcs->stats.rx_dropped;
+ return;
+ }
+
+ skb_reserve(skb, 1);
+ memcpy(skb->data, buf, new_len);
+ skb_put(skb, new_len);
+ skb->mac.raw = skb->data;
+ skb->protocol = htons(ETH_P_IRDA);
+ skb->dev = mcs->netdev;
+
+ netif_rx(skb);
+
+ mcs->stats.rx_packets++;
+ mcs->stats.rx_bytes += new_len;
+
+ return;
+}
+
+
+/* Allocates urbs for both receive and transmit.
+ * If alloc fails return error code 0 (fail) otherwise
+ * return error code 1 (success).
+ */
+static inline int mcs_setup_urbs(struct mcs_cb *mcs)
+{
+ mcs->rx_urb = NULL;
+
+ mcs->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!mcs->tx_urb)
+ return 0;
+
+ mcs->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!mcs->rx_urb)
+ return 0;
+
+ return 1;
+}
+
+/* Sets up state to be initially outside frame, gets receive urb,
+ * sets status to successful and then submits the urb to start
+ * receiving the data.
+ */
+static inline int mcs_receive_start(struct mcs_cb *mcs)
+{
+ mcs->rx_buff.in_frame = FALSE;
+ mcs->rx_buff.state = OUTSIDE_FRAME;
+
+ usb_fill_bulk_urb(mcs->rx_urb, mcs->usbdev,
+ usb_rcvbulkpipe(mcs->usbdev, mcs->ep_in),
+ mcs->in_buf, 4096, mcs_receive_irq, mcs);
+
+ mcs->rx_urb->status = 0;
+ return usb_submit_urb(mcs->rx_urb, GFP_KERNEL);
+}
+
+/* Finds the in and out endpoints for the mcs control block */
+static inline int mcs_find_endpoints(struct mcs_cb *mcs,
+ struct usb_host_endpoint *ep, int epnum)
+{
+ int i;
+ int ret = 0;
+
+ /* If no place to store the endpoints just return */
+ if (!ep)
+ return ret;
+
+ /* cycle through all endpoints, find the first two that are DIR_IN */
+ for (i = 0; i < epnum; i++) {
+ if (ep[i].desc.bEndpointAddress & USB_DIR_IN)
+ mcs->ep_in = ep[i].desc.bEndpointAddress;
+ else
+ mcs->ep_out = ep[i].desc.bEndpointAddress;
+
+ /* MosChip says that the chip has only two bulk
+ * endpoints. Find one for each direction and move on.
+ */
+ if ((mcs->ep_in != 0) && (mcs->ep_out != 0)) {
+ ret = 1;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void mcs_speed_work(void *arg)
+{
+ struct mcs_cb *mcs = arg;
+ struct net_device *netdev = mcs->netdev;
+
+ mcs_speed_change(mcs);
+ netif_wake_queue(netdev);
+}
+
+/* Function to change the speed of the mcs7780. Fully supports SIR,
+ * MIR, and FIR speeds.
+ */
+static int mcs_speed_change(struct mcs_cb *mcs)
+{
+ int ret = 0;
+ int rst = 0;
+ int cnt = 0;
+ __u16 nspeed;
+ __u16 rval;
+
+ nspeed = mcs_speed_set[(mcs->new_speed >> 8) & 0x0f];
+
+ do {
+ mcs_get_reg(mcs, MCS_RESV_REG, &rval);
+ } while(cnt++ < 100 && (rval & MCS_IRINTX));
+
+ if(cnt >= 100) {
+ IRDA_ERROR("unable to change speed");
+ ret = -EIO;
+ goto error;
+ }
+
+ mcs_get_reg(mcs, MCS_MODE_REG, &rval);
+
+ /* MINRXPW values recomended by MosChip */
+ if (mcs->new_speed <= 115200) {
+ rval &= ~MCS_FIR;
+
+ if ((rst = (mcs->speed > 115200)))
+ mcs_set_reg(mcs, MCS_MINRXPW_REG, 0);
+
+ } else if (mcs->new_speed <= 1152000) {
+ rval &= ~MCS_FIR;
+
+ if ((rst = !(mcs->speed == 576000 || mcs->speed == 1152000)))
+ mcs_set_reg(mcs, MCS_MINRXPW_REG, 5);
+
+ } else {
+ rval |= MCS_FIR;
+
+ if ((rst = (mcs->speed != 4000000)))
+ mcs_set_reg(mcs, MCS_MINRXPW_REG, 5);
+
+ }
+
+ rval &= ~MCS_SPEED_MASK;
+ rval |= nspeed;
+
+ ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
+ if (unlikely(ret))
+ goto error;
+
+ if (rst)
+ switch (mcs->transceiver_type) {
+ case MCS_TSC_VISHAY:
+ ret = mcs_setup_transceiver_vishay(mcs);
+ break;
+
+ case MCS_TSC_SHARP:
+ ret = mcs_setup_transceiver_sharp(mcs);
+ break;
+
+ case MCS_TSC_AGILENT:
+ ret = mcs_setup_transceiver_agilent(mcs);
+ break;
+
+ default:
+ ret = 1;
+ IRDA_WARNING("Unknown transceiver type: %d",
+ mcs->transceiver_type);
+ }
+ if (unlikely(ret))
+ goto error;
+
+ mcs_get_reg(mcs, MCS_MODE_REG, &rval);
+ rval &= ~MCS_RESET;
+ ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
+
+ mcs->speed = mcs->new_speed;
+ error:
+ mcs->new_speed = 0;
+ return ret;
+}
+
+/* Ioctl calls not supported at this time. Can be an area of future work. */
+static int mcs_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
+{
+ /* struct if_irda_req *irq = (struct if_irda_req *)rq; */
+ /* struct mcs_cb *mcs = netdev_priv(netdev); */
+ int ret = 0;
+
+ switch (cmd) {
+ default:
+ ret = -EOPNOTSUPP;
+ }
+
+ return ret;
+}
+
+/* Network device is taken down, done by "ifconfig irda0 down" */
+static int mcs_net_close(struct net_device *netdev)
+{
+ int ret = 0;
+ struct mcs_cb *mcs = netdev_priv(netdev);
+
+ /* Stop transmit processing */
+ netif_stop_queue(netdev);
+
+ /* kill and free the receive and transmit URBs */
+ usb_kill_urb(mcs->rx_urb);
+ usb_free_urb(mcs->rx_urb);
+ usb_kill_urb(mcs->tx_urb);
+ usb_free_urb(mcs->tx_urb);
+
+ /* Stop and remove instance of IrLAP */
+ if (mcs->irlap)
+ irlap_close(mcs->irlap);
+
+ mcs->irlap = NULL;
+ return ret;
+}
+
+/* Network device is taken up, done by "ifconfig irda0 up" */
+static int mcs_net_open(struct net_device *netdev)
+{
+ struct mcs_cb *mcs = netdev_priv(netdev);
+ char hwname[16];
+ int ret = 0;
+
+ ret = usb_clear_halt(mcs->usbdev,
+ usb_sndbulkpipe(mcs->usbdev, mcs->ep_in));
+ if (ret)
+ goto error1;
+ ret = usb_clear_halt(mcs->usbdev,
+ usb_rcvbulkpipe(mcs->usbdev, mcs->ep_out));
+ if (ret)
+ goto error1;
+
+ ret = mcs_setup_transceiver(mcs);
+ if (ret)
+ goto error1;
+
+ ret = -ENOMEM;
+
+ /* Initialize for SIR/FIR to copy data directly into skb. */
+ mcs->receiving = 0;
+ mcs->rx_buff.truesize = IRDA_SKB_MAX_MTU;
+ mcs->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
+ if (!mcs->rx_buff.skb)
+ goto error1;
+
+ skb_reserve(mcs->rx_buff.skb, 1);
+ mcs->rx_buff.head = mcs->rx_buff.skb->data;
+ do_gettimeofday(&mcs->rx_time);
+
+ /*
+ * 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", mcs->usbdev->devnum);
+ mcs->irlap = irlap_open(netdev, &mcs->qos, hwname);
+ if (!mcs->irlap) {
+ IRDA_ERROR("mcs7780: irlap_open failed");
+ goto error2;
+ }
+
+ if (!mcs_setup_urbs(mcs))
+ goto error3;
+
+ ret = mcs_receive_start(mcs);
+ if (ret)
+ goto error3;
+
+ netif_start_queue(netdev);
+ return 0;
+
+ error3:
+ irlap_close(mcs->irlap);
+ error2:
+ kfree_skb(mcs->rx_buff.skb);
+ error1:
+ return ret;
+}
+
+
+/* Get device stats for /proc/net/dev and ifconfig */
+static struct net_device_stats *mcs_net_get_stats(struct net_device *netdev)
+{
+ struct mcs_cb *mcs = netdev_priv(netdev);
+ return &mcs->stats;
+}
+
+/* Receive callback function. */
+static void mcs_receive_irq(struct urb *urb, struct pt_regs *regs)
+{
+ __u8 *bytes;
+ struct mcs_cb *mcs = urb->context;
+ int i;
+ int ret;
+
+ if (!netif_running(mcs->netdev))
+ return;
+
+ if (urb->status)
+ return;
+
+ if (urb->actual_length > 0) {
+ bytes = urb->transfer_buffer;
+
+ /* MCS returns frames without BOF and EOF
+ * I assume it returns whole frames.
+ */
+ /* SIR speed */
+ if(mcs->speed < 576000) {
+ async_unwrap_char(mcs->netdev, &mcs->stats,
+ &mcs->rx_buff, 0xc0);
+
+ for (i = 0; i < urb->actual_length; i++)
+ async_unwrap_char(mcs->netdev, &mcs->stats,
+ &mcs->rx_buff, bytes[i]);
+
+ async_unwrap_char(mcs->netdev, &mcs->stats,
+ &mcs->rx_buff, 0xc1);
+ }
+ /* MIR speed */
+ else if(mcs->speed == 576000 || mcs->speed == 1152000) {
+ mcs_unwrap_mir(mcs, urb->transfer_buffer,
+ urb->actual_length);
+ }
+ /* FIR speed */
+ else {
+ mcs_unwrap_fir(mcs, urb->transfer_buffer,
+ urb->actual_length);
+ }
+ mcs->netdev->last_rx = jiffies;
+ do_gettimeofday(&mcs->rx_time);
+ }
+
+ ret = usb_submit_urb(urb, GFP_ATOMIC);
+}
+
+/* Transmit callback funtion. */
+static void mcs_send_irq(struct urb *urb, struct pt_regs *regs)
+{
+ struct mcs_cb *mcs = urb->context;
+ struct net_device *ndev = mcs->netdev;
+
+ if (unlikely(mcs->new_speed))
+ schedule_work(&mcs->work);
+ else
+ netif_wake_queue(ndev);
+}
+
+/* Transmit callback funtion. */
+static int mcs_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+ unsigned long flags;
+ struct mcs_cb *mcs;
+ int wraplen;
+ int ret = 0;
+
+
+ if (skb == NULL || ndev == NULL)
+ return -EINVAL;
+
+ netif_stop_queue(ndev);
+ mcs = netdev_priv(ndev);
+
+ spin_lock_irqsave(&mcs->lock, flags);
+
+ mcs->new_speed = irda_get_next_speed(skb);
+ if (likely(mcs->new_speed == mcs->speed))
+ mcs->new_speed = 0;
+
+ /* SIR speed */
+ if(mcs->speed < 576000) {
+ wraplen = mcs_wrap_sir_skb(skb, mcs->out_buf);
+ }
+ /* MIR speed */
+ else if(mcs->speed == 576000 || mcs->speed == 1152000) {
+ wraplen = mcs_wrap_mir_skb(skb, mcs->out_buf);
+ }
+ /* FIR speed */
+ else {
+ wraplen = mcs_wrap_fir_skb(skb, mcs->out_buf);
+ }
+ usb_fill_bulk_urb(mcs->tx_urb, mcs->usbdev,
+ usb_sndbulkpipe(mcs->usbdev, mcs->ep_out),
+ mcs->out_buf, wraplen, mcs_send_irq, mcs);
+
+ if ((ret = usb_submit_urb(mcs->tx_urb, GFP_ATOMIC))) {
+ IRDA_ERROR("failed tx_urb: %d", ret);
+ switch (ret) {
+ case -ENODEV:
+ case -EPIPE:
+ break;
+ default:
+ mcs->stats.tx_errors++;
+ netif_start_queue(ndev);
+ }
+ } else {
+ mcs->stats.tx_packets++;
+ mcs->stats.tx_bytes += skb->len;
+ }
+
+ dev_kfree_skb(skb);
+ spin_unlock_irqrestore(&mcs->lock, flags);
+ return ret;
+}
+
+/*
+ * This function is called by the USB subsystem for each new device in the
+ * system. Need to verify the device and if it is, then start handling it.
+ */
+static int mcs_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct usb_device *udev = interface_to_usbdev(intf);
+ struct net_device *ndev = NULL;
+ struct mcs_cb *mcs;
+ int ret = -ENOMEM;
+
+ ndev = alloc_irdadev(sizeof(*mcs));
+ if (!ndev)
+ goto error1;
+
+ IRDA_DEBUG(1, "MCS7780 USB-IrDA bridge found at %d.", udev->devnum);
+
+ /* what is it realy for? */
+ SET_MODULE_OWNER(ndev);
+ SET_NETDEV_DEV(ndev, &intf->dev);
+
+ ret = usb_reset_configuration(udev);
+ if (ret != 0) {
+ IRDA_ERROR("mcs7780: usb reset configuration failed");
+ goto error2;
+ }
+
+ mcs = netdev_priv(ndev);
+ mcs->usbdev = udev;
+ mcs->netdev = ndev;
+ spin_lock_init(&mcs->lock);
+
+ /* Initialize QoS for this device */
+ irda_init_max_qos_capabilies(&mcs->qos);
+
+ /* That's the Rx capability. */
+ mcs->qos.baud_rate.bits &=
+ IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200
+ | IR_576000 | IR_1152000 | (IR_4000000 << 8);
+
+
+ mcs->qos.min_turn_time.bits &= qos_mtt_bits;
+ irda_qos_bits_to_value(&mcs->qos);
+
+ /* Speed change work initialisation*/
+ INIT_WORK(&mcs->work, mcs_speed_work, mcs);
+
+ /* Override the network functions we need to use */
+ ndev->hard_start_xmit = mcs_hard_xmit;
+ ndev->open = mcs_net_open;
+ ndev->stop = mcs_net_close;
+ ndev->get_stats = mcs_net_get_stats;
+ ndev->do_ioctl = mcs_net_ioctl;
+
+ if (!intf->cur_altsetting)
+ goto error2;
+
+ ret = mcs_find_endpoints(mcs, intf->cur_altsetting->endpoint,
+ intf->cur_altsetting->desc.bNumEndpoints);
+ if (!ret) {
+ ret = -ENODEV;
+ goto error2;
+ }
+
+ ret = register_netdev(ndev);
+ if (ret != 0)
+ goto error2;
+
+ IRDA_DEBUG(1, "IrDA: Registered MosChip MCS7780 device as %s",
+ ndev->name);
+
+ mcs->transceiver_type = transceiver_type;
+ mcs->sir_tweak = sir_tweak;
+ mcs->receive_mode = receive_mode;
+
+ usb_set_intfdata(intf, mcs);
+ return 0;
+
+ error2:
+ free_netdev(ndev);
+
+ error1:
+ return ret;
+}
+
+/* The current device is removed, the USB layer tells us to shut down. */
+static void mcs_disconnect(struct usb_interface *intf)
+{
+ struct mcs_cb *mcs = usb_get_intfdata(intf);
+
+ if (!mcs)
+ return;
+
+ flush_scheduled_work();
+
+ unregister_netdev(mcs->netdev);
+ free_netdev(mcs->netdev);
+
+ usb_set_intfdata(intf, NULL);
+ IRDA_DEBUG(0, "MCS7780 now disconnected.");
+}
+
+/* Module insertion */
+static int __init mcs_init(void)
+{
+ int result;
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&mcs_driver);
+ if (result)
+ IRDA_ERROR("usb_register failed. Error number %d", result);
+
+ return result;
+}
+module_init(mcs_init);
+
+/* Module removal */
+static void __exit mcs_exit(void)
+{
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&mcs_driver);
+}
+module_exit(mcs_exit);
+