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cxacru.c

/******************************************************************************
 *  cxacru.c  -  driver for USB ADSL modems based on
 *               Conexant AccessRunner chipset
 *
 *  Copyright (C) 2004 David Woodhouse, Duncan Sands, Roman Kagan
 *  Copyright (C) 2005 Duncan Sands, Roman Kagan (rkagan % mail ! ru)
 *  Copyright (C) 2007 Simon Arlott
 *
 *  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., 59
 *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 ******************************************************************************/

/*
 *  Credit is due for Josep Comas, who created the original patch to speedtch.c
 *  to support the different padding used by the AccessRunner (now generalized
 *  into usbatm), and the userspace firmware loading utility.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/mutex.h>

#include "usbatm.h"

#define DRIVER_AUTHOR   "Roman Kagan, David Woodhouse, Duncan Sands, Simon Arlott"
#define DRIVER_VERSION  "0.3"
#define DRIVER_DESC     "Conexant AccessRunner ADSL USB modem driver"

static const char cxacru_driver_name[] = "cxacru";

#define CXACRU_EP_CMD         0x01  /* Bulk/interrupt in/out */
#define CXACRU_EP_DATA        0x02  /* Bulk in/out */

#define CMD_PACKET_SIZE       64    /* Should be maxpacket(ep)? */

/* Addresses */
#define PLLFCLK_ADDR    0x00350068
#define PLLBCLK_ADDR    0x0035006c
#define SDRAMEN_ADDR    0x00350010
#define FW_ADDR         0x00801000
#define BR_ADDR         0x00180600
#define SIG_ADDR  0x00180500
#define BR_STACK_ADDR   0x00187f10

/* Values */
#define SDRAM_ENA 0x1

#define CMD_TIMEOUT     2000  /* msecs */
#define POLL_INTERVAL   1     /* secs */

/* commands for interaction with the modem through the control channel before
 * firmware is loaded  */
enum cxacru_fw_request {
      FW_CMD_ERR,
      FW_GET_VER,
      FW_READ_MEM,
      FW_WRITE_MEM,
      FW_RMW_MEM,
      FW_CHECKSUM_MEM,
      FW_GOTO_MEM,
};

/* commands for interaction with the modem through the control channel once
 * firmware is loaded  */
enum cxacru_cm_request {
      CM_REQUEST_UNDEFINED = 0x80,
      CM_REQUEST_TEST,
      CM_REQUEST_CHIP_GET_MAC_ADDRESS,
      CM_REQUEST_CHIP_GET_DP_VERSIONS,
      CM_REQUEST_CHIP_ADSL_LINE_START,
      CM_REQUEST_CHIP_ADSL_LINE_STOP,
      CM_REQUEST_CHIP_ADSL_LINE_GET_STATUS,
      CM_REQUEST_CHIP_ADSL_LINE_GET_SPEED,
      CM_REQUEST_CARD_INFO_GET,
      CM_REQUEST_CARD_DATA_GET,
      CM_REQUEST_CARD_DATA_SET,
      CM_REQUEST_COMMAND_HW_IO,
      CM_REQUEST_INTERFACE_HW_IO,
      CM_REQUEST_CARD_SERIAL_DATA_PATH_GET,
      CM_REQUEST_CARD_SERIAL_DATA_PATH_SET,
      CM_REQUEST_CARD_CONTROLLER_VERSION_GET,
      CM_REQUEST_CARD_GET_STATUS,
      CM_REQUEST_CARD_GET_MAC_ADDRESS,
      CM_REQUEST_CARD_GET_DATA_LINK_STATUS,
      CM_REQUEST_MAX,
};

/* reply codes to the commands above */
enum cxacru_cm_status {
      CM_STATUS_UNDEFINED,
      CM_STATUS_SUCCESS,
      CM_STATUS_ERROR,
      CM_STATUS_UNSUPPORTED,
      CM_STATUS_UNIMPLEMENTED,
      CM_STATUS_PARAMETER_ERROR,
      CM_STATUS_DBG_LOOPBACK,
      CM_STATUS_MAX,
};

/* indices into CARD_INFO_GET return array */
enum cxacru_info_idx {
      CXINF_DOWNSTREAM_RATE,
      CXINF_UPSTREAM_RATE,
      CXINF_LINK_STATUS,
      CXINF_LINE_STATUS,
      CXINF_MAC_ADDRESS_HIGH,
      CXINF_MAC_ADDRESS_LOW,
      CXINF_UPSTREAM_SNR_MARGIN,
      CXINF_DOWNSTREAM_SNR_MARGIN,
      CXINF_UPSTREAM_ATTENUATION,
      CXINF_DOWNSTREAM_ATTENUATION,
      CXINF_TRANSMITTER_POWER,
      CXINF_UPSTREAM_BITS_PER_FRAME,
      CXINF_DOWNSTREAM_BITS_PER_FRAME,
      CXINF_STARTUP_ATTEMPTS,
      CXINF_UPSTREAM_CRC_ERRORS,
      CXINF_DOWNSTREAM_CRC_ERRORS,
      CXINF_UPSTREAM_FEC_ERRORS,
      CXINF_DOWNSTREAM_FEC_ERRORS,
      CXINF_UPSTREAM_HEC_ERRORS,
      CXINF_DOWNSTREAM_HEC_ERRORS,
      CXINF_LINE_STARTABLE,
      CXINF_MODULATION,
      CXINF_ADSL_HEADEND,
      CXINF_ADSL_HEADEND_ENVIRONMENT,
      CXINF_CONTROLLER_VERSION,
      /* dunno what the missing two mean */
      CXINF_MAX = 0x1c,
};

enum cxacru_poll_state {
      CXPOLL_STOPPING,
      CXPOLL_STOPPED,
      CXPOLL_POLLING,
      CXPOLL_SHUTDOWN
};

struct cxacru_modem_type {
      u32 pll_f_clk;
      u32 pll_b_clk;
      int boot_rom_patch;
};

struct cxacru_data {
      struct usbatm_data *usbatm;

      const struct cxacru_modem_type *modem_type;

      int line_status;
      struct mutex adsl_state_serialize;
      int adsl_status;
      struct delayed_work poll_work;
      u32 card_info[CXINF_MAX];
      struct mutex poll_state_serialize;
      enum cxacru_poll_state poll_state;

      /* contol handles */
      struct mutex cm_serialize;
      u8 *rcv_buf;
      u8 *snd_buf;
      struct urb *rcv_urb;
      struct urb *snd_urb;
      struct completion rcv_done;
      struct completion snd_done;
};

static int cxacru_cm(struct cxacru_data *instance, enum cxacru_cm_request cm,
      u8 *wdata, int wsize, u8 *rdata, int rsize);
static void cxacru_poll_status(struct work_struct *work);

/* Card info exported through sysfs */
#define CXACRU__ATTR_INIT(_name) \
static DEVICE_ATTR(_name, S_IRUGO, cxacru_sysfs_show_##_name, NULL)

#define CXACRU_CMD_INIT(_name) \
static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, \
      cxacru_sysfs_show_##_name, cxacru_sysfs_store_##_name)

#define CXACRU_ATTR_INIT(_value, _type, _name) \
static ssize_t cxacru_sysfs_show_##_name(struct device *dev, \
      struct device_attribute *attr, char *buf) \
{ \
      struct usb_interface *intf = to_usb_interface(dev); \
      struct usbatm_data *usbatm_instance = usb_get_intfdata(intf); \
      struct cxacru_data *instance = usbatm_instance->driver_data; \
      return cxacru_sysfs_showattr_##_type(instance->card_info[_value], buf); \
} \
CXACRU__ATTR_INIT(_name)

#define CXACRU_ATTR_CREATE(_v, _t, _name) CXACRU_DEVICE_CREATE_FILE(_name)
#define CXACRU_CMD_CREATE(_name)          CXACRU_DEVICE_CREATE_FILE(_name)
#define CXACRU__ATTR_CREATE(_name)        CXACRU_DEVICE_CREATE_FILE(_name)

#define CXACRU_ATTR_REMOVE(_v, _t, _name) CXACRU_DEVICE_REMOVE_FILE(_name)
#define CXACRU_CMD_REMOVE(_name)          CXACRU_DEVICE_REMOVE_FILE(_name)
#define CXACRU__ATTR_REMOVE(_name)        CXACRU_DEVICE_REMOVE_FILE(_name)

static ssize_t cxacru_sysfs_showattr_u32(u32 value, char *buf)
{
      return snprintf(buf, PAGE_SIZE, "%u\n", value);
}

static ssize_t cxacru_sysfs_showattr_s8(s8 value, char *buf)
{
      return snprintf(buf, PAGE_SIZE, "%d\n", value);
}

static ssize_t cxacru_sysfs_showattr_dB(s16 value, char *buf)
{
      return snprintf(buf, PAGE_SIZE, "%d.%02u\n",
                              value / 100, abs(value) % 100);
}

static ssize_t cxacru_sysfs_showattr_bool(u32 value, char *buf)
{
      static char *str[] = { "no", "yes" };
      if (unlikely(value >= ARRAY_SIZE(str)))
            return snprintf(buf, PAGE_SIZE, "%u\n", value);
      return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
}

static ssize_t cxacru_sysfs_showattr_LINK(u32 value, char *buf)
{
      static char *str[] = { NULL, "not connected", "connected", "lost" };
      if (unlikely(value >= ARRAY_SIZE(str) || str[value] == NULL))
            return snprintf(buf, PAGE_SIZE, "%u\n", value);
      return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
}

static ssize_t cxacru_sysfs_showattr_LINE(u32 value, char *buf)
{
      static char *str[] = { "down", "attempting to activate",
            "training", "channel analysis", "exchange", "up",
            "waiting", "initialising"
      };
      if (unlikely(value >= ARRAY_SIZE(str)))
            return snprintf(buf, PAGE_SIZE, "%u\n", value);
      return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
}

static ssize_t cxacru_sysfs_showattr_MODU(u32 value, char *buf)
{
      static char *str[] = {
                  NULL,
                  "ANSI T1.413",
                  "ITU-T G.992.1 (G.DMT)",
                  "ITU-T G.992.2 (G.LITE)"
      };
      if (unlikely(value >= ARRAY_SIZE(str) || str[value] == NULL))
            return snprintf(buf, PAGE_SIZE, "%u\n", value);
      return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
}

/*
 * This could use MAC_ADDRESS_HIGH and MAC_ADDRESS_LOW, but since
 * this data is already in atm_dev there's no point.
 *
 * MAC_ADDRESS_HIGH = 0x????5544
 * MAC_ADDRESS_LOW  = 0x33221100
 * Where 00-55 are bytes 0-5 of the MAC.
 */
static ssize_t cxacru_sysfs_show_mac_address(struct device *dev,
      struct device_attribute *attr, char *buf)
{
      struct usb_interface *intf = to_usb_interface(dev);
      struct usbatm_data *usbatm_instance = usb_get_intfdata(intf);
      struct atm_dev *atm_dev = usbatm_instance->atm_dev;

      return snprintf(buf, PAGE_SIZE, "%02x:%02x:%02x:%02x:%02x:%02x\n",
                  atm_dev->esi[0], atm_dev->esi[1], atm_dev->esi[2],
                  atm_dev->esi[3], atm_dev->esi[4], atm_dev->esi[5]);
}

static ssize_t cxacru_sysfs_show_adsl_state(struct device *dev,
      struct device_attribute *attr, char *buf)
{
      struct usb_interface *intf = to_usb_interface(dev);
      struct usbatm_data *usbatm_instance = usb_get_intfdata(intf);
      struct cxacru_data *instance = usbatm_instance->driver_data;
      u32 value = instance->card_info[CXINF_LINE_STARTABLE];

      static char *str[] = { "running", "stopped" };
      if (unlikely(value >= ARRAY_SIZE(str)))
            return snprintf(buf, PAGE_SIZE, "%u\n", value);
      return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
}

static ssize_t cxacru_sysfs_store_adsl_state(struct device *dev,
      struct device_attribute *attr, const char *buf, size_t count)
{
      struct usb_interface *intf = to_usb_interface(dev);
      struct usbatm_data *usbatm_instance = usb_get_intfdata(intf);
      struct cxacru_data *instance = usbatm_instance->driver_data;
      int ret;
      int poll = -1;
      char str_cmd[8];
      int len = strlen(buf);

      if (!capable(CAP_NET_ADMIN))
            return -EACCES;

      ret = sscanf(buf, "%7s", str_cmd);
      if (ret != 1)
            return -EINVAL;
      ret = 0;

      if (mutex_lock_interruptible(&instance->adsl_state_serialize))
            return -ERESTARTSYS;

      if (!strcmp(str_cmd, "stop") || !strcmp(str_cmd, "restart")) {
            ret = cxacru_cm(instance, CM_REQUEST_CHIP_ADSL_LINE_STOP, NULL, 0, NULL, 0);
            if (ret < 0) {
                  atm_err(usbatm_instance, "change adsl state:"
                        " CHIP_ADSL_LINE_STOP returned %d\n", ret);

                  ret = -EIO;
            } else {
                  ret = len;
                  poll = CXPOLL_STOPPED;
            }
      }

      /* Line status is only updated every second
       * and the device appears to only react to
       * START/STOP every second too. Wait 1.5s to
       * be sure that restart will have an effect. */
      if (!strcmp(str_cmd, "restart"))
            msleep(1500);

      if (!strcmp(str_cmd, "start") || !strcmp(str_cmd, "restart")) {
            ret = cxacru_cm(instance, CM_REQUEST_CHIP_ADSL_LINE_START, NULL, 0, NULL, 0);
            if (ret < 0) {
                  atm_err(usbatm_instance, "change adsl state:"
                        " CHIP_ADSL_LINE_START returned %d\n", ret);

                  ret = -EIO;
            } else {
                  ret = len;
                  poll = CXPOLL_POLLING;
            }
      }

      if (!strcmp(str_cmd, "poll")) {
            ret = len;
            poll = CXPOLL_POLLING;
      }

      if (ret == 0) {
            ret = -EINVAL;
            poll = -1;
      }

      if (poll == CXPOLL_POLLING) {
            mutex_lock(&instance->poll_state_serialize);
            switch (instance->poll_state) {
            case CXPOLL_STOPPED:
                  /* start polling */
                  instance->poll_state = CXPOLL_POLLING;
                  break;

            case CXPOLL_STOPPING:
                  /* abort stop request */
                  instance->poll_state = CXPOLL_POLLING;
            case CXPOLL_POLLING:
            case CXPOLL_SHUTDOWN:
                  /* don't start polling */
                  poll = -1;
            }
            mutex_unlock(&instance->poll_state_serialize);
      } else if (poll == CXPOLL_STOPPED) {
            mutex_lock(&instance->poll_state_serialize);
            /* request stop */
            if (instance->poll_state == CXPOLL_POLLING)
                  instance->poll_state = CXPOLL_STOPPING;
            mutex_unlock(&instance->poll_state_serialize);
      }

      mutex_unlock(&instance->adsl_state_serialize);

      if (poll == CXPOLL_POLLING)
            cxacru_poll_status(&instance->poll_work.work);

      return ret;
}

/*
 * All device attributes are included in CXACRU_ALL_FILES
 * so that the same list can be used multiple times:
 *     INIT   (define the device attributes)
 *     CREATE (create all the device files)
 *     REMOVE (remove all the device files)
 *
 * With the last two being defined as needed in the functions
 * they are used in before calling CXACRU_ALL_FILES()
 */
#define CXACRU_ALL_FILES(_action) \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_RATE,           u32,  downstream_rate); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_RATE,             u32,  upstream_rate); \
CXACRU_ATTR_##_action(CXINF_LINK_STATUS,               LINK, link_status); \
CXACRU_ATTR_##_action(CXINF_LINE_STATUS,               LINE, line_status); \
CXACRU__ATTR_##_action(                                      mac_address); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_SNR_MARGIN,       dB,   upstream_snr_margin); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_SNR_MARGIN,     dB,   downstream_snr_margin); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_ATTENUATION,      dB,   upstream_attenuation); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_ATTENUATION,    dB,   downstream_attenuation); \
CXACRU_ATTR_##_action(CXINF_TRANSMITTER_POWER,         s8,   transmitter_power); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_BITS_PER_FRAME,   u32,  upstream_bits_per_frame); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_BITS_PER_FRAME, u32,  downstream_bits_per_frame); \
CXACRU_ATTR_##_action(CXINF_STARTUP_ATTEMPTS,          u32,  startup_attempts); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_CRC_ERRORS,       u32,  upstream_crc_errors); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_CRC_ERRORS,     u32,  downstream_crc_errors); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_FEC_ERRORS,       u32,  upstream_fec_errors); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_FEC_ERRORS,     u32,  downstream_fec_errors); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_HEC_ERRORS,       u32,  upstream_hec_errors); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_HEC_ERRORS,     u32,  downstream_hec_errors); \
CXACRU_ATTR_##_action(CXINF_LINE_STARTABLE,            bool, line_startable); \
CXACRU_ATTR_##_action(CXINF_MODULATION,                MODU, modulation); \
CXACRU_ATTR_##_action(CXINF_ADSL_HEADEND,              u32,  adsl_headend); \
CXACRU_ATTR_##_action(CXINF_ADSL_HEADEND_ENVIRONMENT,  u32,  adsl_headend_environment); \
CXACRU_ATTR_##_action(CXINF_CONTROLLER_VERSION,        u32,  adsl_controller_version); \
CXACRU_CMD_##_action(                                        adsl_state);

CXACRU_ALL_FILES(INIT);

/* the following three functions are stolen from drivers/usb/core/message.c */
static void cxacru_blocking_completion(struct urb *urb)
{
      complete((struct completion *)urb->context);
}

static void cxacru_timeout_kill(unsigned long data)
{
      usb_unlink_urb((struct urb *) data);
}

static int cxacru_start_wait_urb(struct urb *urb, struct completion *done,
                         int* actual_length)
{
      struct timer_list timer;

      init_timer(&timer);
      timer.expires = jiffies + msecs_to_jiffies(CMD_TIMEOUT);
      timer.data = (unsigned long) urb;
      timer.function = cxacru_timeout_kill;
      add_timer(&timer);
      wait_for_completion(done);
      del_timer_sync(&timer);

      if (actual_length)
            *actual_length = urb->actual_length;
      return urb->status; /* must read status after completion */
}

static int cxacru_cm(struct cxacru_data *instance, enum cxacru_cm_request cm,
                 u8 *wdata, int wsize, u8 *rdata, int rsize)
{
      int ret, actlen;
      int offb, offd;
      const int stride = CMD_PACKET_SIZE - 4;
      u8 *wbuf = instance->snd_buf;
      u8 *rbuf = instance->rcv_buf;
      int wbuflen = ((wsize - 1) / stride + 1) * CMD_PACKET_SIZE;
      int rbuflen = ((rsize - 1) / stride + 1) * CMD_PACKET_SIZE;

      if (wbuflen > PAGE_SIZE || rbuflen > PAGE_SIZE) {
            if (printk_ratelimit())
                  usb_err(instance->usbatm, "requested transfer size too large (%d, %d)\n",
                        wbuflen, rbuflen);
            ret = -ENOMEM;
            goto fail;
      }

      mutex_lock(&instance->cm_serialize);

      /* submit reading urb before the writing one */
      init_completion(&instance->rcv_done);
      ret = usb_submit_urb(instance->rcv_urb, GFP_KERNEL);
      if (ret < 0) {
            if (printk_ratelimit())
                  usb_err(instance->usbatm, "submit of read urb for cm %#x failed (%d)\n",
                        cm, ret);
            goto fail;
      }

      memset(wbuf, 0, wbuflen);
      /* handle wsize == 0 */
      wbuf[0] = cm;
      for (offb = offd = 0; offd < wsize; offd += stride, offb += CMD_PACKET_SIZE) {
            wbuf[offb] = cm;
            memcpy(wbuf + offb + 4, wdata + offd, min_t(int, stride, wsize - offd));
      }

      instance->snd_urb->transfer_buffer_length = wbuflen;
      init_completion(&instance->snd_done);
      ret = usb_submit_urb(instance->snd_urb, GFP_KERNEL);
      if (ret < 0) {
            if (printk_ratelimit())
                  usb_err(instance->usbatm, "submit of write urb for cm %#x failed (%d)\n",
                        cm, ret);
            goto fail;
      }

      ret = cxacru_start_wait_urb(instance->snd_urb, &instance->snd_done, NULL);
      if (ret < 0) {
            if (printk_ratelimit())
                  usb_err(instance->usbatm, "send of cm %#x failed (%d)\n", cm, ret);
            goto fail;
      }

      ret = cxacru_start_wait_urb(instance->rcv_urb, &instance->rcv_done, &actlen);
      if (ret < 0) {
            if (printk_ratelimit())
                  usb_err(instance->usbatm, "receive of cm %#x failed (%d)\n", cm, ret);
            goto fail;
      }
      if (actlen % CMD_PACKET_SIZE || !actlen) {
            if (printk_ratelimit())
                  usb_err(instance->usbatm, "invalid response length to cm %#x: %d\n",
                        cm, actlen);
            ret = -EIO;
            goto fail;
      }

      /* check the return status and copy the data to the output buffer, if needed */
      for (offb = offd = 0; offd < rsize && offb < actlen; offb += CMD_PACKET_SIZE) {
            if (rbuf[offb] != cm) {
                  if (printk_ratelimit())
                        usb_err(instance->usbatm, "wrong cm %#x in response to cm %#x\n",
                              rbuf[offb], cm);
                  ret = -EIO;
                  goto fail;
            }
            if (rbuf[offb + 1] != CM_STATUS_SUCCESS) {
                  if (printk_ratelimit())
                        usb_err(instance->usbatm, "response to cm %#x failed: %#x\n",
                              cm, rbuf[offb + 1]);
                  ret = -EIO;
                  goto fail;
            }
            if (offd >= rsize)
                  break;
            memcpy(rdata + offd, rbuf + offb + 4, min_t(int, stride, rsize - offd));
            offd += stride;
      }

      ret = offd;
      dbg("cm %#x", cm);
fail:
      mutex_unlock(&instance->cm_serialize);
      return ret;
}

static int cxacru_cm_get_array(struct cxacru_data *instance, enum cxacru_cm_request cm,
                         u32 *data, int size)
{
      int ret, len;
      u32 *buf;
      int offb, offd;
      const int stride = CMD_PACKET_SIZE / (4 * 2) - 1;
      int buflen =  ((size - 1) / stride + 1 + size * 2) * 4;

      buf = kmalloc(buflen, GFP_KERNEL);
      if (!buf)
            return -ENOMEM;

      ret = cxacru_cm(instance, cm, NULL, 0, (u8 *) buf, buflen);
      if (ret < 0)
            goto cleanup;

      /* len > 0 && len % 4 == 0 guaranteed by cxacru_cm() */
      len = ret / 4;
      for (offb = 0; offb < len; ) {
            int l = le32_to_cpu(buf[offb++]);
            if (l > stride || l > (len - offb) / 2) {
                  if (printk_ratelimit())
                        usb_err(instance->usbatm, "invalid data length from cm %#x: %d\n",
                              cm, l);
                  ret = -EIO;
                  goto cleanup;
            }
            while (l--) {
                  offd = le32_to_cpu(buf[offb++]);
                  if (offd >= size) {
                        if (printk_ratelimit())
                              usb_err(instance->usbatm, "wrong index #%x in response to cm #%x\n",
                                    offd, cm);
                        ret = -EIO;
                        goto cleanup;
                  }
                  data[offd] = le32_to_cpu(buf[offb++]);
            }
      }

      ret = 0;

cleanup:
      kfree(buf);
      return ret;
}

static int cxacru_card_status(struct cxacru_data *instance)
{
      int ret = cxacru_cm(instance, CM_REQUEST_CARD_GET_STATUS, NULL, 0, NULL, 0);
      if (ret < 0) {          /* firmware not loaded */
            dbg("cxacru_adsl_start: CARD_GET_STATUS returned %d", ret);
            return ret;
      }
      return 0;
}

static void cxacru_remove_device_files(struct usbatm_data *usbatm_instance,
            struct atm_dev *atm_dev)
{
      struct usb_interface *intf = usbatm_instance->usb_intf;

      #define CXACRU_DEVICE_REMOVE_FILE(_name) \
            device_remove_file(&intf->dev, &dev_attr_##_name);
      CXACRU_ALL_FILES(REMOVE);
      #undef CXACRU_DEVICE_REMOVE_FILE
}

static int cxacru_atm_start(struct usbatm_data *usbatm_instance,
            struct atm_dev *atm_dev)
{
      struct cxacru_data *instance = usbatm_instance->driver_data;
      struct usb_interface *intf = usbatm_instance->usb_intf;
      /*
      struct atm_dev *atm_dev = usbatm_instance->atm_dev;
      */
      int ret;
      int start_polling = 1;

      dbg("cxacru_atm_start");

      /* Read MAC address */
      ret = cxacru_cm(instance, CM_REQUEST_CARD_GET_MAC_ADDRESS, NULL, 0,
                  atm_dev->esi, sizeof(atm_dev->esi));
      if (ret < 0) {
            atm_err(usbatm_instance, "cxacru_atm_start: CARD_GET_MAC_ADDRESS returned %d\n", ret);
            return ret;
      }

      #define CXACRU_DEVICE_CREATE_FILE(_name) \
            ret = device_create_file(&intf->dev, &dev_attr_##_name); \
            if (unlikely(ret)) \
                  goto fail_sysfs;
      CXACRU_ALL_FILES(CREATE);
      #undef CXACRU_DEVICE_CREATE_FILE

      /* start ADSL */
      mutex_lock(&instance->adsl_state_serialize);
      ret = cxacru_cm(instance, CM_REQUEST_CHIP_ADSL_LINE_START, NULL, 0, NULL, 0);
      if (ret < 0)
            atm_err(usbatm_instance, "cxacru_atm_start: CHIP_ADSL_LINE_START returned %d\n", ret);

      /* Start status polling */
      mutex_lock(&instance->poll_state_serialize);
      switch (instance->poll_state) {
      case CXPOLL_STOPPED:
            /* start polling */
            instance->poll_state = CXPOLL_POLLING;
            break;

      case CXPOLL_STOPPING:
            /* abort stop request */
            instance->poll_state = CXPOLL_POLLING;
      case CXPOLL_POLLING:
      case CXPOLL_SHUTDOWN:
            /* don't start polling */
            start_polling = 0;
      }
      mutex_unlock(&instance->poll_state_serialize);
      mutex_unlock(&instance->adsl_state_serialize);

      if (start_polling)
            cxacru_poll_status(&instance->poll_work.work);
      return 0;

fail_sysfs:
      usb_err(usbatm_instance, "cxacru_atm_start: device_create_file failed (%d)\n", ret);
      cxacru_remove_device_files(usbatm_instance, atm_dev);
      return ret;
}

static void cxacru_poll_status(struct work_struct *work)
{
      struct cxacru_data *instance =
            container_of(work, struct cxacru_data, poll_work.work);
      u32 buf[CXINF_MAX] = {};
      struct usbatm_data *usbatm = instance->usbatm;
      struct atm_dev *atm_dev = usbatm->atm_dev;
      int keep_polling = 1;
      int ret;

      ret = cxacru_cm_get_array(instance, CM_REQUEST_CARD_INFO_GET, buf, CXINF_MAX);
      if (ret < 0) {
            if (ret != -ESHUTDOWN)
                  atm_warn(usbatm, "poll status: error %d\n", ret);

            mutex_lock(&instance->poll_state_serialize);
            if (instance->poll_state != CXPOLL_SHUTDOWN) {
                  instance->poll_state = CXPOLL_STOPPED;

                  if (ret != -ESHUTDOWN)
                        atm_warn(usbatm, "polling disabled, set adsl_state"
                                    " to 'start' or 'poll' to resume\n");
            }
            mutex_unlock(&instance->poll_state_serialize);
            goto reschedule;
      }

      memcpy(instance->card_info, buf, sizeof(instance->card_info));

      if (instance->adsl_status != buf[CXINF_LINE_STARTABLE]) {
            instance->adsl_status = buf[CXINF_LINE_STARTABLE];

            switch (instance->adsl_status) {
            case 0:
                  atm_printk(KERN_INFO, usbatm, "ADSL state: running\n");
                  break;

            case 1:
                  atm_printk(KERN_INFO, usbatm, "ADSL state: stopped\n");
                  break;

            default:
                  atm_printk(KERN_INFO, usbatm, "Unknown adsl status %02x\n", instance->adsl_status);
                  break;
            }
      }

      if (instance->line_status == buf[CXINF_LINE_STATUS])
            goto reschedule;

      instance->line_status = buf[CXINF_LINE_STATUS];
      switch (instance->line_status) {
      case 0:
            atm_dev->signal = ATM_PHY_SIG_LOST;
            atm_info(usbatm, "ADSL line: down\n");
            break;

      case 1:
            atm_dev->signal = ATM_PHY_SIG_LOST;
            atm_info(usbatm, "ADSL line: attempting to activate\n");
            break;

      case 2:
            atm_dev->signal = ATM_PHY_SIG_LOST;
            atm_info(usbatm, "ADSL line: training\n");
            break;

      case 3:
            atm_dev->signal = ATM_PHY_SIG_LOST;
            atm_info(usbatm, "ADSL line: channel analysis\n");
            break;

      case 4:
            atm_dev->signal = ATM_PHY_SIG_LOST;
            atm_info(usbatm, "ADSL line: exchange\n");
            break;

      case 5:
            atm_dev->link_rate = buf[CXINF_DOWNSTREAM_RATE] * 1000 / 424;
            atm_dev->signal = ATM_PHY_SIG_FOUND;

            atm_info(usbatm, "ADSL line: up (%d kb/s down | %d kb/s up)\n",
                 buf[CXINF_DOWNSTREAM_RATE], buf[CXINF_UPSTREAM_RATE]);
            break;

      case 6:
            atm_dev->signal = ATM_PHY_SIG_LOST;
            atm_info(usbatm, "ADSL line: waiting\n");
            break;

      case 7:
            atm_dev->signal = ATM_PHY_SIG_LOST;
            atm_info(usbatm, "ADSL line: initializing\n");
            break;

      default:
            atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
            atm_info(usbatm, "Unknown line state %02x\n", instance->line_status);
            break;
      }
reschedule:

      mutex_lock(&instance->poll_state_serialize);
      if (instance->poll_state == CXPOLL_STOPPING &&
                        instance->adsl_status == 1 && /* stopped */
                        instance->line_status == 0) /* down */
            instance->poll_state = CXPOLL_STOPPED;

      if (instance->poll_state == CXPOLL_STOPPED)
            keep_polling = 0;
      mutex_unlock(&instance->poll_state_serialize);

      if (keep_polling)
            schedule_delayed_work(&instance->poll_work,
                        round_jiffies_relative(POLL_INTERVAL*HZ));
}

static int cxacru_fw(struct usb_device *usb_dev, enum cxacru_fw_request fw,
                 u8 code1, u8 code2, u32 addr, u8 *data, int size)
{
      int ret;
      u8 *buf;
      int offd, offb;
      const int stride = CMD_PACKET_SIZE - 8;

      buf = (u8 *) __get_free_page(GFP_KERNEL);
      if (!buf)
            return -ENOMEM;

      offb = offd = 0;
      do {
            int l = min_t(int, stride, size - offd);
            buf[offb++] = fw;
            buf[offb++] = l;
            buf[offb++] = code1;
            buf[offb++] = code2;
            *((u32 *) (buf + offb)) = cpu_to_le32(addr);
            offb += 4;
            addr += l;
            if(l)
                  memcpy(buf + offb, data + offd, l);
            if (l < stride)
                  memset(buf + offb + l, 0, stride - l);
            offb += stride;
            offd += stride;
            if ((offb >= PAGE_SIZE) || (offd >= size)) {
                  ret = usb_bulk_msg(usb_dev, usb_sndbulkpipe(usb_dev, CXACRU_EP_CMD),
                                 buf, offb, NULL, CMD_TIMEOUT);
                  if (ret < 0) {
                        dbg("sending fw %#x failed", fw);
                        goto cleanup;
                  }
                  offb = 0;
            }
      } while(offd < size);
      dbg("sent fw %#x", fw);

      ret = 0;

cleanup:
      free_page((unsigned long) buf);
      return ret;
}

static void cxacru_upload_firmware(struct cxacru_data *instance,
                           const struct firmware *fw,
                           const struct firmware *bp,
                           const struct firmware *cf)
{
      int ret;
      int off;
      struct usbatm_data *usbatm = instance->usbatm;
      struct usb_device *usb_dev = usbatm->usb_dev;
      u16 signature[] = { usb_dev->descriptor.idVendor, usb_dev->descriptor.idProduct };
      u32 val;

      dbg("cxacru_upload_firmware");

      /* FirmwarePllFClkValue */
      val = cpu_to_le32(instance->modem_type->pll_f_clk);
      ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, PLLFCLK_ADDR, (u8 *) &val, 4);
      if (ret) {
            usb_err(usbatm, "FirmwarePllFClkValue failed: %d\n", ret);
            return;
      }

      /* FirmwarePllBClkValue */
      val = cpu_to_le32(instance->modem_type->pll_b_clk);
      ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, PLLBCLK_ADDR, (u8 *) &val, 4);
      if (ret) {
            usb_err(usbatm, "FirmwarePllBClkValue failed: %d\n", ret);
            return;
      }

      /* Enable SDRAM */
      val = cpu_to_le32(SDRAM_ENA);
      ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, SDRAMEN_ADDR, (u8 *) &val, 4);
      if (ret) {
            usb_err(usbatm, "Enable SDRAM failed: %d\n", ret);
            return;
      }

      /* Firmware */
      ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, FW_ADDR, fw->data, fw->size);
      if (ret) {
            usb_err(usbatm, "Firmware upload failed: %d\n", ret);
            return;
      }

      /* Boot ROM patch */
      if (instance->modem_type->boot_rom_patch) {
            ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, BR_ADDR, bp->data, bp->size);
            if (ret) {
                  usb_err(usbatm, "Boot ROM patching failed: %d\n", ret);
                  return;
            }
      }

      /* Signature */
      ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, SIG_ADDR, (u8 *) signature, 4);
      if (ret) {
            usb_err(usbatm, "Signature storing failed: %d\n", ret);
            return;
      }

      if (instance->modem_type->boot_rom_patch) {
            val = cpu_to_le32(BR_ADDR);
            ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, BR_STACK_ADDR, (u8 *) &val, 4);
      }
      else {
            ret = cxacru_fw(usb_dev, FW_GOTO_MEM, 0x0, 0x0, FW_ADDR, NULL, 0);
      }
      if (ret) {
            usb_err(usbatm, "Passing control to firmware failed: %d\n", ret);
            return;
      }

      /* Delay to allow firmware to start up. */
      msleep_interruptible(1000);

      usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, CXACRU_EP_CMD));
      usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, CXACRU_EP_CMD));
      usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, CXACRU_EP_DATA));
      usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, CXACRU_EP_DATA));

      ret = cxacru_cm(instance, CM_REQUEST_CARD_GET_STATUS, NULL, 0, NULL, 0);
      if (ret < 0) {
            usb_err(usbatm, "modem failed to initialize: %d\n", ret);
            return;
      }

      /* Load config data (le32), doing one packet at a time */
      if (cf)
            for (off = 0; off < cf->size / 4; ) {
                  u32 buf[CMD_PACKET_SIZE / 4 - 1];
                  int i, len = min_t(int, cf->size / 4 - off, CMD_PACKET_SIZE / 4 / 2 - 1);
                  buf[0] = cpu_to_le32(len);
                  for (i = 0; i < len; i++, off++) {
                        buf[i * 2 + 1] = cpu_to_le32(off);
                        memcpy(buf + i * 2 + 2, cf->data + off * 4, 4);
                  }
                  ret = cxacru_cm(instance, CM_REQUEST_CARD_DATA_SET,
                              (u8 *) buf, len, NULL, 0);
                  if (ret < 0) {
                        usb_err(usbatm, "load config data failed: %d\n", ret);
                        return;
                  }
            }

      msleep_interruptible(4000);
}

static int cxacru_find_firmware(struct cxacru_data *instance,
                        char* phase, const struct firmware **fw_p)
{
      struct usbatm_data *usbatm = instance->usbatm;
      struct device *dev = &usbatm->usb_intf->dev;
      char buf[16];

      sprintf(buf, "cxacru-%s.bin", phase);
      dbg("cxacru_find_firmware: looking for %s", buf);

      if (request_firmware(fw_p, buf, dev)) {
            usb_dbg(usbatm, "no stage %s firmware found\n", phase);
            return -ENOENT;
      }

      usb_info(usbatm, "found firmware %s\n", buf);

      return 0;
}

static int cxacru_heavy_init(struct usbatm_data *usbatm_instance,
                       struct usb_interface *usb_intf)
{
      const struct firmware *fw, *bp, *cf;
      struct cxacru_data *instance = usbatm_instance->driver_data;

      int ret = cxacru_find_firmware(instance, "fw", &fw);
      if (ret) {
            usb_warn(usbatm_instance, "firmware (cxacru-fw.bin) unavailable (system misconfigured?)\n");
            return ret;
      }

      if (instance->modem_type->boot_rom_patch) {
            ret = cxacru_find_firmware(instance, "bp", &bp);
            if (ret) {
                  usb_warn(usbatm_instance, "boot ROM patch (cxacru-bp.bin) unavailable (system misconfigured?)\n");
                  release_firmware(fw);
                  return ret;
            }
      }

      if (cxacru_find_firmware(instance, "cf", &cf))        /* optional */
            cf = NULL;

      cxacru_upload_firmware(instance, fw, bp, cf);

      if (cf)
            release_firmware(cf);
      if (instance->modem_type->boot_rom_patch)
            release_firmware(bp);
      release_firmware(fw);

      ret = cxacru_card_status(instance);
      if (ret)
            dbg("modem initialisation failed");
      else
            dbg("done setting up the modem");

      return ret;
}

static int cxacru_bind(struct usbatm_data *usbatm_instance,
                   struct usb_interface *intf, const struct usb_device_id *id)
{
      struct cxacru_data *instance;
      struct usb_device *usb_dev = interface_to_usbdev(intf);
      int ret;

      /* instance init */
      instance = kzalloc(sizeof(*instance), GFP_KERNEL);
      if (!instance) {
            dbg("cxacru_bind: no memory for instance data");
            return -ENOMEM;
      }

      instance->usbatm = usbatm_instance;
      instance->modem_type = (struct cxacru_modem_type *) id->driver_info;
      memset(instance->card_info, 0, sizeof(instance->card_info));

      mutex_init(&instance->poll_state_serialize);
      instance->poll_state = CXPOLL_STOPPED;
      instance->line_status = -1;
      instance->adsl_status = -1;

      mutex_init(&instance->adsl_state_serialize);

      instance->rcv_buf = (u8 *) __get_free_page(GFP_KERNEL);
      if (!instance->rcv_buf) {
            dbg("cxacru_bind: no memory for rcv_buf");
            ret = -ENOMEM;
            goto fail;
      }
      instance->snd_buf = (u8 *) __get_free_page(GFP_KERNEL);
      if (!instance->snd_buf) {
            dbg("cxacru_bind: no memory for snd_buf");
            ret = -ENOMEM;
            goto fail;
      }
      instance->rcv_urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!instance->rcv_urb) {
            dbg("cxacru_bind: no memory for rcv_urb");
            ret = -ENOMEM;
            goto fail;
      }
      instance->snd_urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!instance->snd_urb) {
            dbg("cxacru_bind: no memory for snd_urb");
            ret = -ENOMEM;
            goto fail;
      }

      usb_fill_int_urb(instance->rcv_urb,
                  usb_dev, usb_rcvintpipe(usb_dev, CXACRU_EP_CMD),
                  instance->rcv_buf, PAGE_SIZE,
                  cxacru_blocking_completion, &instance->rcv_done, 1);

      usb_fill_int_urb(instance->snd_urb,
                  usb_dev, usb_sndintpipe(usb_dev, CXACRU_EP_CMD),
                  instance->snd_buf, PAGE_SIZE,
                  cxacru_blocking_completion, &instance->snd_done, 4);

      mutex_init(&instance->cm_serialize);

      INIT_DELAYED_WORK(&instance->poll_work, cxacru_poll_status);

      usbatm_instance->driver_data = instance;

      usbatm_instance->flags = (cxacru_card_status(instance) ? 0 : UDSL_SKIP_HEAVY_INIT);

      return 0;

 fail:
      free_page((unsigned long) instance->snd_buf);
      free_page((unsigned long) instance->rcv_buf);
      usb_free_urb(instance->snd_urb);
      usb_free_urb(instance->rcv_urb);
      kfree(instance);

      return ret;
}

static void cxacru_unbind(struct usbatm_data *usbatm_instance,
            struct usb_interface *intf)
{
      struct cxacru_data *instance = usbatm_instance->driver_data;
      int is_polling = 1;

      dbg("cxacru_unbind entered");

      if (!instance) {
            dbg("cxacru_unbind: NULL instance!");
            return;
      }

      mutex_lock(&instance->poll_state_serialize);
      BUG_ON(instance->poll_state == CXPOLL_SHUTDOWN);

      /* ensure that status polling continues unless
       * it has already stopped */
      if (instance->poll_state == CXPOLL_STOPPED)
            is_polling = 0;

      /* stop polling from being stopped or started */
      instance->poll_state = CXPOLL_SHUTDOWN;
      mutex_unlock(&instance->poll_state_serialize);

      if (is_polling)
            cancel_rearming_delayed_work(&instance->poll_work);

      usb_kill_urb(instance->snd_urb);
      usb_kill_urb(instance->rcv_urb);
      usb_free_urb(instance->snd_urb);
      usb_free_urb(instance->rcv_urb);

      free_page((unsigned long) instance->snd_buf);
      free_page((unsigned long) instance->rcv_buf);

      kfree(instance);

      usbatm_instance->driver_data = NULL;
}

static const struct cxacru_modem_type cxacru_cafe = {
      .pll_f_clk = 0x02d874df,
      .pll_b_clk = 0x0196a51a,
      .boot_rom_patch = 1,
};

static const struct cxacru_modem_type cxacru_cb00 = {
      .pll_f_clk = 0x5,
      .pll_b_clk = 0x3,
      .boot_rom_patch = 0,
};

static const struct usb_device_id cxacru_usb_ids[] = {
      { /* V = Conexant             P = ADSL modem (Euphrates project)  */
            USB_DEVICE(0x0572, 0xcafe),   .driver_info = (unsigned long) &cxacru_cafe
      },
      { /* V = Conexant             P = ADSL modem (Hasbani project)    */
            USB_DEVICE(0x0572, 0xcb00),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Conexant             P = ADSL modem                      */
            USB_DEVICE(0x0572, 0xcb01),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Conexant             P = ADSL modem (Well PTI-800) */
            USB_DEVICE(0x0572, 0xcb02),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Conexant             P = ADSL modem                      */
            USB_DEVICE(0x0572, 0xcb06),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Conexant             P = ADSL modem (ZTE ZXDSL 852)            */
            USB_DEVICE(0x0572, 0xcb07),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Olitec                     P = ADSL modem version 2            */
            USB_DEVICE(0x08e3, 0x0100),   .driver_info = (unsigned long) &cxacru_cafe
      },
      { /* V = Olitec                     P = ADSL modem version 3            */
            USB_DEVICE(0x08e3, 0x0102),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Trust/Amigo Technology Co. P = AMX-CA86U                       */
            USB_DEVICE(0x0eb0, 0x3457),   .driver_info = (unsigned long) &cxacru_cafe
      },
      { /* V = Zoom                       P = 5510                      */
            USB_DEVICE(0x1803, 0x5510),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Draytek              P = Vigor 318                       */
            USB_DEVICE(0x0675, 0x0200),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Zyxel                      P = 630-C1 aka OMNI ADSL USB (Annex A)    */
            USB_DEVICE(0x0586, 0x330a),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Zyxel                      P = 630-C3 aka OMNI ADSL USB (Annex B)    */
            USB_DEVICE(0x0586, 0x330b),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Aethra                     P = Starmodem UM1020                */
            USB_DEVICE(0x0659, 0x0020),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Aztech Systems             P = ? AKA Pirelli AUA-010           */
            USB_DEVICE(0x0509, 0x0812),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Netopia              P = Cayman 3341(Annex A)/3351(Annex B)    */
            USB_DEVICE(0x100d, 0xcb01),   .driver_info = (unsigned long) &cxacru_cb00
      },
      { /* V = Netopia              P = Cayman 3342(Annex A)/3352(Annex B)    */
            USB_DEVICE(0x100d, 0x3342),   .driver_info = (unsigned long) &cxacru_cb00
      },
      {}
};

MODULE_DEVICE_TABLE(usb, cxacru_usb_ids);

static struct usbatm_driver cxacru_driver = {
      .driver_name      = cxacru_driver_name,
      .bind       = cxacru_bind,
      .heavy_init = cxacru_heavy_init,
      .unbind           = cxacru_unbind,
      .atm_start  = cxacru_atm_start,
      .atm_stop   = cxacru_remove_device_files,
      .bulk_in    = CXACRU_EP_DATA,
      .bulk_out   = CXACRU_EP_DATA,
      .rx_padding = 3,
      .tx_padding = 11,
};

static int cxacru_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
      return usbatm_usb_probe(intf, id, &cxacru_driver);
}

static struct usb_driver cxacru_usb_driver = {
      .name       = cxacru_driver_name,
      .probe            = cxacru_usb_probe,
      .disconnect = usbatm_usb_disconnect,
      .id_table   = cxacru_usb_ids
};

static int __init cxacru_init(void)
{
      return usb_register(&cxacru_usb_driver);
}

static void __exit cxacru_cleanup(void)
{
      usb_deregister(&cxacru_usb_driver);
}

module_init(cxacru_init);
module_exit(cxacru_cleanup);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);

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