Quelle  cxacru.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0+
/******************************************************************************
 *  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
 *  Copyright (C) 2009 Simon Arlott
 ******************************************************************************/

/*
 *  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/device.h>
#include <linux/firmware.h>
#include <linux/mutex.h>
#include <linux/unaligned.h>

#include "usbatm.h"

#define DRIVER_AUTHOR "Roman Kagan, David Woodhouse, Duncan Sands, Simon Arlott"
#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)? */
#define CMD_MAX_CONFIG  ((CMD_PACKET_SIZE / 4 - 1) / 2)

/* 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,
};

/* commands for interaction with the flash memory
 *
 * read:  response is the contents of the first 60 bytes of flash memory
 * write: request contains the 60 bytes of data to write to flash memory
 *        response is the contents of the first 60 bytes of flash memory
 *
 * layout: PP PP VV VV  MM MM MM MM  MM MM ?? ??  SS SS SS SS  SS SS SS SS
 *         SS SS SS SS  SS SS SS SS  00 00 00 00  00 00 00 00  00 00 00 00
 *         00 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00
 *
 *   P: le16  USB Product ID
 *   V: le16  USB Vendor ID
 *   M: be48  MAC Address
 *   S: le16  ASCII Serial Number
 */
enum cxacru_cm_flash {
 CM_FLASH_READ = 0xa1,
 CM_FLASH_WRITE = 0xa2
};

/* 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;

 /* control 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_RO(_name)

#define CXACRU_CMD_INIT(_name) \
static DEVICE_ATTR_RW(_name)

#define CXACRU_SET_INIT(_name) \
static DEVICE_ATTR_WO(_name)

#define CXACRU_ATTR_INIT(_value, _type, _name) \
static ssize_t _name##_show(struct device *dev, \
 struct device_attribute *attr, char *buf) \
{ \
 struct cxacru_data *instance = to_usbatm_driver_data(\
  to_usb_interface(dev)); \
\
 if (instance == NULL) \
  return -ENODEV; \
\
 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_SET_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_SET_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 sprintf(buf, "%u\n", value);
}

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

static ssize_t cxacru_sysfs_showattr_dB(s16 value, char *buf)
{
 if (likely(value >= 0)) {
  return snprintf(buf, PAGE_SIZE, "%u.%02u\n",
     value / 100, value % 100);
 } else {
  value = -value;
  return snprintf(buf, PAGE_SIZE, "-%u.%02u\n",
     value / 100, 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 sprintf(buf, "%u\n", value);
 return sprintf(buf, "%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 sprintf(buf, "%u\n", value);
 return sprintf(buf, "%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 sprintf(buf, "%u\n", value);
 return sprintf(buf, "%s\n", str[value]);
}

static ssize_t cxacru_sysfs_showattr_MODU(u32 value, char *buf)
{
 static char *str[] = {
   "",
   "ANSI T1.413",
   "ITU-T G.992.1 (G.DMT)",
   "ITU-T G.992.2 (G.LITE)"
 };
 if (unlikely(value >= ARRAY_SIZE(str)))
  return sprintf(buf, "%u\n", value);
 return sprintf(buf, "%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 mac_address_show(struct device *dev,
 struct device_attribute *attr, char *buf)
{
 struct cxacru_data *instance = to_usbatm_driver_data(
   to_usb_interface(dev));

 if (instance == NULL || instance->usbatm->atm_dev == NULL)
  return -ENODEV;

 return sprintf(buf, "%pM\n", instance->usbatm->atm_dev->esi);
}

static ssize_t adsl_state_show(struct device *dev,
 struct device_attribute *attr, char *buf)
{
 static char *str[] = { "running", "stopped" };
 struct cxacru_data *instance = to_usbatm_driver_data(
   to_usb_interface(dev));
 u32 value;

 if (instance == NULL)
  return -ENODEV;

 value = instance->card_info[CXINF_LINE_STARTABLE];
 if (unlikely(value >= ARRAY_SIZE(str)))
  return sprintf(buf, "%u\n", value);
 return sprintf(buf, "%s\n", str[value]);
}

static ssize_t adsl_state_store(struct device *dev,
 struct device_attribute *attr, const char *buf, size_t count)
{
 struct cxacru_data *instance = to_usbatm_driver_data(
   to_usb_interface(dev));
 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 (instance == NULL)
  return -ENODEV;

 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(instance->usbatm, "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(instance->usbatm, "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;
   fallthrough;
  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;
}

/* CM_REQUEST_CARD_DATA_GET times out, so no show attribute */

static ssize_t adsl_config_store(struct device *dev,
 struct device_attribute *attr, const char *buf, size_t count)
{
 struct cxacru_data *instance = to_usbatm_driver_data(
   to_usb_interface(dev));
 int len = strlen(buf);
 int ret, pos, num;
 __le32 data[CMD_PACKET_SIZE / 4];

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

 if (instance == NULL)
  return -ENODEV;

 pos = 0;
 num = 0;
 while (pos < len) {
  int tmp;
  u32 index;
  u32 value;

  ret = sscanf(buf + pos, "%x=%x%n", &index, &value, &tmp);
  if (ret < 2)
   return -EINVAL;
  if (index > 0x7f)
   return -EINVAL;
  if (tmp < 0 || tmp > len - pos)
   return -EINVAL;
  pos += tmp;

  /* skip trailing newline */
  if (buf[pos] == '\n' && pos == len-1)
   pos++;

  data[num * 2 + 1] = cpu_to_le32(index);
  data[num * 2 + 2] = cpu_to_le32(value);
  num++;

  /* send config values when data buffer is full
 * or no more data
 */
  if (pos >= len || num >= CMD_MAX_CONFIG) {
   char log[CMD_MAX_CONFIG * 12 + 1]; /* %02x=%08x */

   data[0] = cpu_to_le32(num);
   ret = cxacru_cm(instance, CM_REQUEST_CARD_DATA_SET,
    (u8 *) data, 4 + num * 8, NULL, 0);
   if (ret < 0) {
    atm_err(instance->usbatm,
     "set card data returned %d\n", ret);
    return -EIO;
   }

   for (tmp = 0; tmp < num; tmp++)
    snprintf(log + tmp*12, 13, " %02x=%08x",
     le32_to_cpu(data[tmp * 2 + 1]),
     le32_to_cpu(data[tmp * 2 + 2]));
   atm_info(instance->usbatm, "config%s\n", log);
   num = 0;
  }
 }

 return len;
}

/*
 * 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_SET_##_action(                                        adsl_config);

CXACRU_ALL_FILES(INIT);

static struct attribute *cxacru_attrs[] = {
 &dev_attr_adsl_config.attr,
 &dev_attr_adsl_state.attr,
 &dev_attr_adsl_controller_version.attr,
 &dev_attr_adsl_headend_environment.attr,
 &dev_attr_adsl_headend.attr,
 &dev_attr_modulation.attr,
 &dev_attr_line_startable.attr,
 &dev_attr_downstream_hec_errors.attr,
 &dev_attr_upstream_hec_errors.attr,
 &dev_attr_downstream_fec_errors.attr,
 &dev_attr_upstream_fec_errors.attr,
 &dev_attr_downstream_crc_errors.attr,
 &dev_attr_upstream_crc_errors.attr,
 &dev_attr_startup_attempts.attr,
 &dev_attr_downstream_bits_per_frame.attr,
 &dev_attr_upstream_bits_per_frame.attr,
 &dev_attr_transmitter_power.attr,
 &dev_attr_downstream_attenuation.attr,
 &dev_attr_upstream_attenuation.attr,
 &dev_attr_downstream_snr_margin.attr,
 &dev_attr_upstream_snr_margin.attr,
 &dev_attr_mac_address.attr,
 &dev_attr_line_status.attr,
 &dev_attr_link_status.attr,
 &dev_attr_upstream_rate.attr,
 &dev_attr_downstream_rate.attr,
 NULL,
};
ATTRIBUTE_GROUPS(cxacru);

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

struct cxacru_timer {
 struct timer_list timer;
 struct urb *urb;
};

static void cxacru_timeout_kill(struct timer_list *t)
{
 struct cxacru_timer *timer = timer_container_of(timer, t, timer);

 usb_unlink_urb(timer->urb);
}

static int cxacru_start_wait_urb(struct urb *urb, struct completion *done,
     int *actual_length)
{
 struct cxacru_timer timer = {
  .urb = urb,
 };

 timer_setup_on_stack(&timer.timer, cxacru_timeout_kill, 0);
 mod_timer(&timer.timer, jiffies + msecs_to_jiffies(CMD_TIMEOUT));
 wait_for_completion(done);
 timer_delete_sync(&timer.timer);
 timer_destroy_on_stack(&timer.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 err;
 }

 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;
 usb_dbg(instance->usbatm, "cm %#x\n", cm);
fail:
 mutex_unlock(&instance->cm_serialize);
err:
 return ret;
}

static int cxacru_cm_get_array(struct cxacru_data *instance, enum cxacru_cm_request cm,
          u32 *data, int size)
{
 int ret, len;
 __le32 *buf;
 int offb;
 unsigned int 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 < 0 || 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 */
  usb_dbg(instance->usbatm, "cxacru_adsl_start: CARD_GET_STATUS returned %d\n", ret);
  return ret;
 }
 return 0;
}

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;
 int ret;
 int start_polling = 1;

 dev_dbg(&intf->dev, "%s\n", __func__);

 /* 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;
 }

 /* 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;
  fallthrough;
 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;
}

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_info(usbatm, "ADSL state: running\n");
   break;

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

  default:
   atm_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_change(atm_dev, ATM_PHY_SIG_LOST);
  atm_info(usbatm, "ADSL line: down\n");
  break;

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

 case 2:
  atm_dev_signal_change(atm_dev, ATM_PHY_SIG_LOST);
  atm_info(usbatm, "ADSL line: training\n");
  break;

 case 3:
  atm_dev_signal_change(atm_dev, ATM_PHY_SIG_LOST);
  atm_info(usbatm, "ADSL line: channel analysis\n");
  break;

 case 4:
  atm_dev_signal_change(atm_dev, 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_change(atm_dev, 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_change(atm_dev, ATM_PHY_SIG_LOST);
  atm_info(usbatm, "ADSL line: waiting\n");
  break;

 case 7:
  atm_dev_signal_change(atm_dev, ATM_PHY_SIG_LOST);
  atm_info(usbatm, "ADSL line: initializing\n");
  break;

 default:
  atm_dev_signal_change(atm_dev, 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, const 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;
  put_unaligned(cpu_to_le32(addr), (__le32 *)(buf + offb));
  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) {
    dev_dbg(&usb_dev->dev, "sending fw %#x failed\n", fw);
    goto cleanup;
   }
   offb = 0;
  }
 } while (offd < size);
 dev_dbg(&usb_dev->dev, "sent fw %#x\n", fw);

 ret = 0;

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


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);
 usb_dbg(usbatm, "cxacru_find_firmware: looking for %s\n", 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;
 struct cxacru_data *instance = usbatm_instance->driver_data;
 struct usbatm_data *usbatm = instance->usbatm;
 struct usb_device *usb_dev = usbatm->usb_dev;
 __le16 signature[] = { usb_dev->descriptor.idVendor,
          usb_dev->descriptor.idProduct };
 __le32 val;
 int ret;

 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;
  }
 }

 /* 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);
  goto done;
 }

 /* 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);
  goto done;
 }

 /* 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);
  goto done;
 }

 /* Firmware */
 usb_info(usbatm, "loading firmware\n");
 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);
  goto done;
 }

 /* Boot ROM patch */
 if (instance->modem_type->boot_rom_patch) {
  usb_info(usbatm, "loading boot ROM patch\n");
  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);
   goto done;
  }
 }

 /* 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);
  goto done;
 }

 usb_info(usbatm, "starting device\n");
 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);
  goto done;
 }

 /* 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);
  goto done;
 }

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

 ret = cxacru_card_status(instance);
 if (ret)
  usb_dbg(usbatm_instance, "modem initialisation failed\n");
 else
  usb_dbg(usbatm_instance, "done setting up the modem\n");

 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);
 struct usb_host_endpoint *cmd_ep = usb_dev->ep_in[CXACRU_EP_CMD];
 static const u8 ep_addrs[] = {
  CXACRU_EP_CMD + USB_DIR_IN,
  CXACRU_EP_CMD + USB_DIR_OUT,
  0};
 int ret;

 /* instance init */
 instance = kzalloc(sizeof(*instance), GFP_KERNEL);
 if (!instance)
  return -ENOMEM;

 instance->usbatm = usbatm_instance;
 instance->modem_type = (struct cxacru_modem_type *) id->driver_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) {
  usb_dbg(usbatm_instance, "cxacru_bind: no memory for rcv_buf\n");
  ret = -ENOMEM;
  goto fail;
 }
 instance->snd_buf = (u8 *) __get_free_page(GFP_KERNEL);
 if (!instance->snd_buf) {
  usb_dbg(usbatm_instance, "cxacru_bind: no memory for snd_buf\n");
  ret = -ENOMEM;
  goto fail;
 }
 instance->rcv_urb = usb_alloc_urb(0, GFP_KERNEL);
 if (!instance->rcv_urb) {
  ret = -ENOMEM;
  goto fail;
 }
 instance->snd_urb = usb_alloc_urb(0, GFP_KERNEL);
 if (!instance->snd_urb) {
  ret = -ENOMEM;
  goto fail;
 }

 if (!cmd_ep) {
  usb_dbg(usbatm_instance, "cxacru_bind: no command endpoint\n");
  ret = -ENODEV;
  goto fail;
 }

 if (usb_endpoint_xfer_int(&cmd_ep->desc))
  ret = usb_check_int_endpoints(intf, ep_addrs);
 else
  ret = usb_check_bulk_endpoints(intf, ep_addrs);

 if (!ret) {
  usb_err(usbatm_instance, "cxacru_bind: interface has incorrect endpoints\n");
  ret = -ENODEV;
  goto fail;
 }

 if ((cmd_ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
   == USB_ENDPOINT_XFER_INT) {
  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);
 } else {
  usb_fill_bulk_urb(instance->rcv_urb,
   usb_dev, usb_rcvbulkpipe(usb_dev, CXACRU_EP_CMD),
   instance->rcv_buf, PAGE_SIZE,
   cxacru_blocking_completion, &instance->rcv_done);

  usb_fill_bulk_urb(instance->snd_urb,
   usb_dev, usb_sndbulkpipe(usb_dev, CXACRU_EP_CMD),
   instance->snd_buf, PAGE_SIZE,
   cxacru_blocking_completion, &instance->snd_done);
 }

 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;

 usb_dbg(usbatm_instance, "cxacru_unbind entered\n");

 if (!instance) {
  usb_dbg(usbatm_instance, "cxacru_unbind: NULL instance!\n");
  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_delayed_work_sync(&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,
 .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)
{
 struct usb_device *usb_dev = interface_to_usbdev(intf);
 char buf[15];

 /* Avoid ADSL routers (cx82310_eth).
 * Abort if bDeviceClass is 0xff and iProduct is "USB NET CARD".
 */
 if (usb_dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC
   && usb_string(usb_dev, usb_dev->descriptor.iProduct,
    buf, sizeof(buf)) > 0) {
  if (!strcmp(buf, "USB NET CARD")) {
   dev_info(&intf->dev, "ignoring cx82310_eth device\n");
   return -ENODEV;
  }
 }

 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,
 .dev_groups = cxacru_groups,
};

module_usb_driver(cxacru_usb_driver);

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