Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1378 insertions, 0 deletions

diff --git a/drivers/usb/atm/cxacru.c b/drivers/usb/atm/cxacru.c
new file mode 100644
index 000000000..4ce7cba2b
--- /dev/null
+++ b/drivers/usb/atm/cxacru.c
@@ -0,0 +1,1378 @@
+// 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 <asm/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 = from_timer(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);
+	del_timer_sync(&timer.timer);
+	destroy_timer_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 void cxacru_upload_firmware(struct cxacru_data *instance,
+				   const struct firmware *fw,
+				   const struct firmware *bp)
+{
+	int ret;
+	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;
+
+	usb_dbg(usbatm, "%s\n", __func__);
+
+	/* 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 */
+	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);
+		return;
+	}
+
+	/* 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);
+			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;
+	}
+
+	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);
+		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;
+	}
+}
+
+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;
+	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;
+		}
+	}
+
+	cxacru_upload_firmware(instance, fw, bp);
+
+	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];
+	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 ((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");