[PATCH] USB ATM: driver for the Conexant AccessRunner chipset cxacru

Driver for modems based on the Conexant AccessRunner chipset.
Original patch by Josep Comas, much reworked by Roman Kagan.

Signed-off-by: Duncan Sands <baldrick@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 878 insertions, 0 deletions

diff --git a/drivers/usb/atm/cxacru.c b/drivers/usb/atm/cxacru.c
new file mode 100644
index 0000000..cbd4a7d
--- /dev/null
+++ b/drivers/usb/atm/cxacru.c
@@ -0,0 +1,878 @@
+/******************************************************************************
+ *  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)
+ *
+ *  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>	/* FIXME: linux/firmware.h should include it itself */
+#include <linux/firmware.h>
+
+#include "usbatm.h"
+
+#define DRIVER_AUTHOR	"Roman Kagan, David Woodhouse, Duncan Sands"
+#define DRIVER_VERSION	"0.2"
+#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	5000	/* msecs */
+
+/* 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,
+};
+
+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 work_struct poll_work;
+
+	/* contol handles */
+	struct semaphore cm_serialize;
+	u8 *rcv_buf;
+	u8 *snd_buf;
+	struct urb *rcv_urb;
+	struct urb *snd_urb;
+	struct completion rcv_done;
+	struct completion snd_done;
+};
+
+/* the following three functions are stolen from drivers/usb/core/message.c */
+static void cxacru_blocking_completion(struct urb *urb, struct pt_regs *regs)
+{
+	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;
+	int status;
+
+	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);
+	status = urb->status;
+	if (status == -ECONNRESET)
+		status = -ETIMEDOUT;
+	del_timer_sync(&timer);
+
+	if (actual_length)
+		*actual_length = urb->actual_length;
+	return status;
+}
+
+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) {
+		dbg("too big transfer requested");
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	down(&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) {
+		dbg("submitting read urb for cm %#x failed", cm);
+		ret = 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) {
+		dbg("submitting write urb for cm %#x failed", cm);
+		ret = ret;
+		goto fail;
+	}
+
+	ret = cxacru_start_wait_urb(instance->snd_urb, &instance->snd_done, NULL);
+	if (ret < 0) {
+		dbg("sending cm %#x failed", cm);
+		ret = ret;
+		goto fail;
+	}
+
+	ret = cxacru_start_wait_urb(instance->rcv_urb, &instance->rcv_done, &actlen);
+	if (ret < 0) {
+		dbg("receiving cm %#x failed", cm);
+		ret = ret;
+		goto fail;
+	}
+	if (actlen % CMD_PACKET_SIZE || !actlen) {
+		dbg("response is not a positive multiple of %d: %#x",
+				CMD_PACKET_SIZE, 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) {
+			dbg("wrong cm %#x in response", rbuf[offb]);
+			ret = -EIO;
+			goto fail;
+		}
+		if (rbuf[offb + 1] != CM_STATUS_SUCCESS) {
+			dbg("response failed: %#x", 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:
+	up(&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) {
+			dbg("wrong data length %#x in response", l);
+			ret = -EIO;
+			goto cleanup;
+		}
+		while (l--) {
+			offd = le32_to_cpu(buf[offb++]);
+			if (offd >= size) {
+				dbg("wrong index %#x in response", offd);
+				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_poll_status(struct cxacru_data *instance);
+
+static int cxacru_atm_start(struct usbatm_data *usbatm_instance,
+		struct atm_dev *atm_dev)
+{
+	struct cxacru_data *instance = usbatm_instance->driver_data;
+	struct device *dev = &usbatm_instance->usb_intf->dev;
+	/*
+	struct atm_dev *atm_dev = usbatm_instance->atm_dev;
+	*/
+	int ret;
+
+	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) {
+		dev_err(dev, "cxacru_atm_start: CARD_GET_MAC_ADDRESS returned %d\n", ret);
+		return ret;
+	}
+
+	/* start ADSL */
+	ret = cxacru_cm(instance, CM_REQUEST_CHIP_ADSL_LINE_START, NULL, 0, NULL, 0);
+	if (ret < 0) {
+		dev_err(dev, "cxacru_atm_start: CHIP_ADSL_LINE_START returned %d\n", ret);
+		return ret;
+	}
+
+	/* Start status polling */
+	cxacru_poll_status(instance);
+	return 0;
+}
+
+static void cxacru_poll_status(struct cxacru_data *instance)
+{
+	u32 buf[CXINF_MAX] = {};
+	struct device *dev = &instance->usbatm->usb_intf->dev;
+	struct atm_dev *atm_dev = instance->usbatm->atm_dev;
+	int ret;
+
+	ret = cxacru_cm_get_array(instance, CM_REQUEST_CARD_INFO_GET, buf, CXINF_MAX);
+	if (ret < 0) {
+		dev_warn(dev, "poll status: error %d\n", ret);
+		goto reschedule;
+	}
+
+	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;
+		dev_info(dev, "ADSL line: down\n");
+		break;
+
+	case 1:
+		atm_dev->signal = ATM_PHY_SIG_LOST;
+		dev_info(dev, "ADSL line: attemtping to activate\n");
+		break;
+
+	case 2:
+		atm_dev->signal = ATM_PHY_SIG_LOST;
+		dev_info(dev, "ADSL line: training\n");
+		break;
+
+	case 3:
+		atm_dev->signal = ATM_PHY_SIG_LOST;
+		dev_info(dev, "ADSL line: channel analysis\n");
+		break;
+
+	case 4:
+		atm_dev->signal = ATM_PHY_SIG_LOST;
+		dev_info(dev, "ADSL line: exchange\n");
+		break;
+
+	case 5:
+		atm_dev->link_rate = buf[CXINF_DOWNSTREAM_RATE] * 1000 / 424;
+		atm_dev->signal = ATM_PHY_SIG_FOUND;
+
+		dev_info(dev, "ADSL line: up (%d Kib/s down | %d Kib/s up)\n",
+		     buf[CXINF_DOWNSTREAM_RATE], buf[CXINF_UPSTREAM_RATE]);
+		break;
+
+	case 6:
+		atm_dev->signal = ATM_PHY_SIG_LOST;
+		dev_info(dev, "ADSL line: waiting\n");
+		break;
+
+	case 7:
+		atm_dev->signal = ATM_PHY_SIG_LOST;
+		dev_info(dev, "ADSL line: initializing\n");
+		break;
+
+	default:
+		atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
+		dev_info(dev, "Unknown line state %02x\n", instance->line_status);
+		break;
+	}
+reschedule:
+	schedule_delayed_work(&instance->poll_work, msecs_to_jiffies(POLL_INTERVAL));
+}
+
+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 usb_device *usb_dev = instance->usbatm->usb_dev;
+	struct device *dev = &instance->usbatm->usb_intf->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) {
+		dev_err(dev, "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) {
+		dev_err(dev, "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) {
+		dev_err(dev, "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) {
+		dev_err(dev, "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) {
+			dev_err(dev, "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) {
+		dev_err(dev, "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) {
+		dev_err(dev, "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) {
+		dev_err(dev, "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) {
+				dev_err(dev, "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 device *dev = &instance->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)) {
+		dev_dbg(dev, "no stage %s firmware found\n", phase);
+		return -ENOENT;
+	}
+
+	dev_info(dev, "found firmware %s\n", buf);
+
+	return 0;
+}
+
+static int cxacru_heavy_init(struct usbatm_data *usbatm_instance,
+			     struct usb_interface *usb_intf)
+{
+	struct device *dev = &usbatm_instance->usb_intf->dev;
+	const struct firmware *fw, *bp, *cf;
+	struct cxacru_data *instance = usbatm_instance->driver_data;
+
+	int ret = cxacru_find_firmware(instance, "fw", &fw);
+	if (ret) {
+		dev_warn(dev, "firmware (cxacru-fw.bin) unavailable (hotplug misconfiguration?)\n");
+		return ret;
+	}
+
+	if (instance->modem_type->boot_rom_patch) {
+		ret = cxacru_find_firmware(instance, "bp", &bp);
+		if (ret) {
+			dev_warn(dev, "boot ROM patch (cxacru-bp.bin) unavailable (hotplug misconfiguration?)\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,
+		       int *need_heavy_init)
+{
+	struct cxacru_data *instance;
+	struct usb_device *usb_dev = interface_to_usbdev(intf);
+	int ret;
+
+	/* instance init */
+	instance = kmalloc(sizeof(*instance), GFP_KERNEL);
+	if (!instance) {
+		dbg("cxacru_bind: no memory for instance data");
+		return -ENOMEM;
+	}
+
+	memset(instance, 0, sizeof(*instance));
+
+	instance->usbatm = usbatm_instance;
+	instance->modem_type = (struct cxacru_modem_type *) id->driver_info;
+
+	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);
+	instance->rcv_urb->transfer_flags |= URB_ASYNC_UNLINK;
+
+	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);
+	instance->snd_urb->transfer_flags |= URB_ASYNC_UNLINK;
+
+	init_MUTEX(&instance->cm_serialize);
+
+	INIT_WORK(&instance->poll_work, (void *)cxacru_poll_status, instance);
+
+	usbatm_instance->driver_data = instance;
+
+	*need_heavy_init = cxacru_card_status(instance);
+
+	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;
+
+	dbg("cxacru_unbind entered");
+
+	if (!instance) {
+		dbg("cxacru_unbind: NULL instance!");
+		return;
+	}
+
+	while (!cancel_delayed_work(&instance->poll_work))
+	       flush_scheduled_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				*/
+		USB_DEVICE(0x0572, 0xcb06),	.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 = {
+	.owner		= THIS_MODULE,
+	.driver_name	= cxacru_driver_name,
+	.bind		= cxacru_bind,
+	.heavy_init	= cxacru_heavy_init,
+	.unbind		= cxacru_unbind,
+	.atm_start	= cxacru_atm_start,
+	.in		= CXACRU_EP_DATA,
+	.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 = {
+	.owner		= THIS_MODULE,
+	.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);