wireless: add plfxlc driver for pureLiFi X, XL, XC devices

This is a driver for pureLiFi X, XL, XC devices which use light to transmit
data, so they are not compatible with normal Wi-Fi devices. The driver uses
separate NL80211_BAND_LC band to distinguish from Wi-Fi.  The driver is based
on 802.11 softMAC Architecture and uses native 802.11 for configuration and
management. Station and Ad-Hoc modes are supported.

The driver is compiled and tested in ARM, x86 architectures and compiled in
powerpc architecture. This driver implementation has been based on the zd1211rw
driver.
Signed-off-by: Srinivasan Raju <srini.raju@purelifi.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220224182042.132466-3-srini.raju@purelifi.com

MAINTAINERS

@@ -15970,6 +15970,12 @@ T:	git git://linuxtv.org/media_tree.git
 F:	Documentation/admin-guide/media/pulse8-cec.rst
 F:	drivers/media/cec/usb/pulse8/
 
+PURELIFI PLFXLC DRIVER
+M:	Srinivasan Raju <srini.raju@purelifi.com>
+L:	linux-wireless@vger.kernel.org
+S:	Supported
+F:	drivers/net/wireless/purelifi/plfxlc/
+
 PVRUSB2 VIDEO4LINUX DRIVER
 M:	Mike Isely <isely@pobox.com>
 L:	pvrusb2@isely.net	(subscribers-only)

drivers/net/wireless/Kconfig

@@ -28,6 +28,7 @@ source "drivers/net/wireless/intersil/Kconfig"
 source "drivers/net/wireless/marvell/Kconfig"
 source "drivers/net/wireless/mediatek/Kconfig"
 source "drivers/net/wireless/microchip/Kconfig"
+source "drivers/net/wireless/purelifi/Kconfig"
 source "drivers/net/wireless/ralink/Kconfig"
 source "drivers/net/wireless/realtek/Kconfig"
 source "drivers/net/wireless/rsi/Kconfig"

drivers/net/wireless/Makefile

@@ -13,6 +13,7 @@ obj-$(CONFIG_WLAN_VENDOR_INTERSIL) += intersil/
 obj-$(CONFIG_WLAN_VENDOR_MARVELL) += marvell/
 obj-$(CONFIG_WLAN_VENDOR_MEDIATEK) += mediatek/
 obj-$(CONFIG_WLAN_VENDOR_MICROCHIP) += microchip/
+obj-$(CONFIG_WLAN_VENDOR_PURELIFI) += purelifi/
 obj-$(CONFIG_WLAN_VENDOR_RALINK) += ralink/
 obj-$(CONFIG_WLAN_VENDOR_REALTEK) += realtek/
 obj-$(CONFIG_WLAN_VENDOR_RSI) += rsi/

drivers/net/wireless/purelifi/Kconfig

+# SPDX-License-Identifier: GPL-2.0-only
+config WLAN_VENDOR_PURELIFI
+	bool "pureLiFi devices"
+	default y
+	help
+	  If you have a pureLiFi device, say Y.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all the
+	  questions about these cards. If you say Y, you will be asked for
+	  your specific card in the following questions.
+
+if WLAN_VENDOR_PURELIFI
+
+source "drivers/net/wireless/purelifi/plfxlc/Kconfig"
+
+endif # WLAN_VENDOR_PURELIFI

drivers/net/wireless/purelifi/Makefile

+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_PLFXLC)		:= plfxlc/

drivers/net/wireless/purelifi/plfxlc/Kconfig

+# SPDX-License-Identifier: GPL-2.0-only
+config PLFXLC
+	tristate "pureLiFi X, XL, XC device support"
+	depends on CFG80211 && MAC80211 && USB
+	help
+	   This option adds support for pureLiFi LiFi wireless USB
+	   adapters. The pureLiFi X, XL, XC USB devices are based on
+	   802.11 OFDM PHY but uses light as the transmission medium.
+	   The driver supports common 802.11 encryption/authentication
+	   methods including Open, WPA, WPA2-Personal and
+	   WPA2-Enterprise (802.1X).
+
+	   To compile this driver as a module, choose m here. The module will
+	   be called plfxlc.

drivers/net/wireless/purelifi/plfxlc/Makefile

+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_PLFXLC)	:= plfxlc.o
+plfxlc-objs 		+= chip.o firmware.o usb.o mac.o

drivers/net/wireless/purelifi/plfxlc/chip.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 pureLiFi
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+
+#include "chip.h"
+#include "mac.h"
+#include "usb.h"
+
+void plfxlc_chip_init(struct plfxlc_chip *chip,
+		      struct ieee80211_hw *hw,
+		      struct usb_interface *intf)
+{
+	memset(chip, 0, sizeof(*chip));
+	mutex_init(&chip->mutex);
+	plfxlc_usb_init(&chip->usb, hw, intf);
+}
+
+void plfxlc_chip_release(struct plfxlc_chip *chip)
+{
+	plfxlc_usb_release(&chip->usb);
+	mutex_destroy(&chip->mutex);
+}
+
+int plfxlc_set_beacon_interval(struct plfxlc_chip *chip, u16 interval,
+			       u8 dtim_period, int type)
+{
+	if (!interval ||
+	    (chip->beacon_set &&
+	     le16_to_cpu(chip->beacon_interval) == interval))
+		return 0;
+
+	chip->beacon_interval = cpu_to_le16(interval);
+	chip->beacon_set = true;
+	return plfxlc_usb_wreq(chip->usb.ez_usb,
+			       &chip->beacon_interval,
+			       sizeof(chip->beacon_interval),
+			       USB_REQ_BEACON_INTERVAL_WR);
+}
+
+int plfxlc_chip_init_hw(struct plfxlc_chip *chip)
+{
+	unsigned char *addr = plfxlc_mac_get_perm_addr(plfxlc_chip_to_mac(chip));
+	struct usb_device *udev = interface_to_usbdev(chip->usb.intf);
+
+	pr_info("plfxlc chip %04x:%04x v%02x %pM %s\n",
+		le16_to_cpu(udev->descriptor.idVendor),
+		le16_to_cpu(udev->descriptor.idProduct),
+		le16_to_cpu(udev->descriptor.bcdDevice),
+		addr,
+		plfxlc_speed(udev->speed));
+
+	return plfxlc_set_beacon_interval(chip, 100, 0, 0);
+}
+
+int plfxlc_chip_switch_radio(struct plfxlc_chip *chip, u16 value)
+{
+	int r;
+	__le16 radio_on = cpu_to_le16(value);
+
+	r = plfxlc_usb_wreq(chip->usb.ez_usb, &radio_on,
+			    sizeof(value), USB_REQ_POWER_WR);
+	if (r)
+		dev_err(plfxlc_chip_dev(chip), "POWER_WR failed (%d)\n", r);
+	return r;
+}
+
+int plfxlc_chip_enable_rxtx(struct plfxlc_chip *chip)
+{
+	plfxlc_usb_enable_tx(&chip->usb);
+	return plfxlc_usb_enable_rx(&chip->usb);
+}
+
+void plfxlc_chip_disable_rxtx(struct plfxlc_chip *chip)
+{
+	u8 value = 0;
+
+	plfxlc_usb_wreq(chip->usb.ez_usb,
+			&value, sizeof(value), USB_REQ_RXTX_WR);
+	plfxlc_usb_disable_rx(&chip->usb);
+	plfxlc_usb_disable_tx(&chip->usb);
+}
+
+int plfxlc_chip_set_rate(struct plfxlc_chip *chip, u8 rate)
+{
+	int r;
+
+	if (!chip)
+		return -EINVAL;
+
+	r = plfxlc_usb_wreq(chip->usb.ez_usb,
+			    &rate, sizeof(rate), USB_REQ_RATE_WR);
+	if (r)
+		dev_err(plfxlc_chip_dev(chip), "RATE_WR failed (%d)\n", r);
+	return r;
+}

drivers/net/wireless/purelifi/plfxlc/chip.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021 pureLiFi
+ */
+
+#ifndef PLFXLC_CHIP_H
+#define PLFXLC_CHIP_H
+
+#include <net/mac80211.h>
+
+#include "usb.h"
+
+enum unit_type {
+	STA = 0,
+	AP = 1,
+};
+
+enum {
+	PLFXLC_RADIO_OFF = 0,
+	PLFXLC_RADIO_ON = 1,
+};
+
+struct plfxlc_chip {
+	struct plfxlc_usb usb;
+	struct mutex mutex; /* lock to protect chip data */
+	enum unit_type unit_type;
+	u16 link_led;
+	u8 beacon_set;
+	u16 beacon_interval;
+};
+
+struct plfxlc_mc_hash {
+	u32 low;
+	u32 high;
+};
+
+#define plfxlc_chip_dev(chip) (&(chip)->usb.intf->dev)
+
+void plfxlc_chip_init(struct plfxlc_chip *chip,
+		      struct ieee80211_hw *hw,
+		      struct usb_interface *intf);
+
+void plfxlc_chip_release(struct plfxlc_chip *chip);
+
+void plfxlc_chip_disable_rxtx(struct plfxlc_chip *chip);
+
+int plfxlc_chip_init_hw(struct plfxlc_chip *chip);
+
+int plfxlc_chip_enable_rxtx(struct plfxlc_chip *chip);
+
+int plfxlc_chip_set_rate(struct plfxlc_chip *chip, u8 rate);
+
+int plfxlc_set_beacon_interval(struct plfxlc_chip *chip, u16 interval,
+			       u8 dtim_period, int type);
+
+int plfxlc_chip_switch_radio(struct plfxlc_chip *chip, u16 value);
+
+static inline struct plfxlc_chip *plfxlc_usb_to_chip(struct plfxlc_usb
+							 *usb)
+{
+	return container_of(usb, struct plfxlc_chip, usb);
+}
+
+static inline void plfxlc_mc_add_all(struct plfxlc_mc_hash *hash)
+{
+	hash->low  = 0xffffffff;
+	hash->high = 0xffffffff;
+}
+
+#endif /* PLFXLC_CHIP_H */

drivers/net/wireless/purelifi/plfxlc/firmware.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 pureLiFi
+ */
+
+#include <linux/firmware.h>
+#include <linux/bitrev.h>
+
+#include "mac.h"
+#include "usb.h"
+
+static int send_vendor_request(struct usb_device *udev, int request,
+			       unsigned char *buffer, int buffer_size)
+{
+	return usb_control_msg(udev,
+			       usb_rcvctrlpipe(udev, 0),
+			       request, 0xC0, 0, 0,
+			       buffer, buffer_size, PLF_USB_TIMEOUT);
+}
+
+static int send_vendor_command(struct usb_device *udev, int request,
+			       unsigned char *buffer, int buffer_size)
+{
+	return usb_control_msg(udev,
+			       usb_sndctrlpipe(udev, 0),
+			       request, USB_TYPE_VENDOR /*0x40*/, 0, 0,
+			       buffer, buffer_size, PLF_USB_TIMEOUT);
+}
+
+int plfxlc_download_fpga(struct usb_interface *intf)
+{
+	struct usb_device *udev = interface_to_usbdev(intf);
+	unsigned char *fpga_dmabuff = NULL;
+	const struct firmware *fw = NULL;
+	int blk_tran_len = PLF_BULK_TLEN;
+	unsigned char *fw_data;
+	const char *fw_name;
+	int r, actual_length;
+	int fw_data_i = 0;
+
+	if ((le16_to_cpu(udev->descriptor.idVendor) ==
+				PURELIFI_X_VENDOR_ID_0) &&
+	    (le16_to_cpu(udev->descriptor.idProduct) ==
+				PURELIFI_X_PRODUCT_ID_0)) {
+		fw_name = "plfxlc/lifi-x.bin";
+		dev_dbg(&intf->dev, "bin file for X selected\n");
+
+	} else if ((le16_to_cpu(udev->descriptor.idVendor)) ==
+					PURELIFI_XC_VENDOR_ID_0 &&
+		   (le16_to_cpu(udev->descriptor.idProduct) ==
+					PURELIFI_XC_PRODUCT_ID_0)) {
+		fw_name = "plfxlc/lifi-xc.bin";
+		dev_dbg(&intf->dev, "bin file for XC selected\n");
+
+	} else {
+		r = -EINVAL;
+		goto error;
+	}
+
+	r = request_firmware(&fw, fw_name, &intf->dev);
+	if (r) {
+		dev_err(&intf->dev, "request_firmware failed (%d)\n", r);
+		goto error;
+	}
+	fpga_dmabuff = kmalloc(PLF_FPGA_STATUS_LEN, GFP_KERNEL);
+
+	if (!fpga_dmabuff) {
+		r = -ENOMEM;
+		goto error_free_fw;
+	}
+	send_vendor_request(udev, PLF_VNDR_FPGA_SET_REQ,
+			    fpga_dmabuff, PLF_FPGA_STATUS_LEN);
+
+	send_vendor_command(udev, PLF_VNDR_FPGA_SET_CMD, NULL, 0);
+
+	if (fpga_dmabuff[0] != PLF_FPGA_MG) {
+		dev_err(&intf->dev, "fpga_dmabuff[0] is wrong\n");
+		r = -EINVAL;
+		goto error_free_fw;
+	}
+
+	for (fw_data_i = 0; fw_data_i < fw->size;) {
+		int tbuf_idx;
+
+		if ((fw->size - fw_data_i) < blk_tran_len)
+			blk_tran_len = fw->size - fw_data_i;
+
+		fw_data = kmemdup(&fw->data[fw_data_i], blk_tran_len,
+				  GFP_KERNEL);
+		if (!fw_data) {
+			r = -ENOMEM;
+			goto error_free_fw;
+		}
+
+		for (tbuf_idx = 0; tbuf_idx < blk_tran_len; tbuf_idx++) {
+			/* u8 bit reverse */
+			fw_data[tbuf_idx] = bitrev8(fw_data[tbuf_idx]);
+		}
+		r = usb_bulk_msg(udev,
+				 usb_sndbulkpipe(interface_to_usbdev(intf),
+						 fpga_dmabuff[0] & 0xff),
+				 fw_data,
+				 blk_tran_len,
+				 &actual_length,
+				 2 * PLF_USB_TIMEOUT);
+
+		if (r)
+			dev_err(&intf->dev, "Bulk msg failed (%d)\n", r);
+
+		kfree(fw_data);
+		fw_data_i += blk_tran_len;
+	}
+
+	kfree(fpga_dmabuff);
+	fpga_dmabuff = kmalloc(PLF_FPGA_STATE_LEN, GFP_KERNEL);
+	if (!fpga_dmabuff) {
+		r = -ENOMEM;
+		goto error_free_fw;
+	}
+	memset(fpga_dmabuff, 0xff, PLF_FPGA_STATE_LEN);
+
+	send_vendor_request(udev, PLF_VNDR_FPGA_STATE_REQ, fpga_dmabuff,
+			    PLF_FPGA_STATE_LEN);
+
+	dev_dbg(&intf->dev, "%*ph\n", 8, fpga_dmabuff);
+
+	if (fpga_dmabuff[0] != 0) {
+		r = -EINVAL;
+		goto error_free_fw;
+	}
+
+	send_vendor_command(udev, PLF_VNDR_FPGA_STATE_CMD, NULL, 0);
+
+	msleep(PLF_MSLEEP_TIME);
+
+error_free_fw:
+	kfree(fpga_dmabuff);
+	release_firmware(fw);
+error:
+	return r;
+}
+
+int plfxlc_download_xl_firmware(struct usb_interface *intf)
+{
+	struct usb_device *udev = interface_to_usbdev(intf);
+	const struct firmware *fwp = NULL;
+	struct plfxlc_firmware_file file = {0};
+	const char *fw_pack;
+	int s, r;
+	u8 *buf;
+	u32 i;
+
+	r = send_vendor_command(udev, PLF_VNDR_XL_FW_CMD, NULL, 0);
+	msleep(PLF_MSLEEP_TIME);
+
+	if (r) {
+		dev_err(&intf->dev, "vendor command failed (%d)\n", r);
+		return -EINVAL;
+	}
+	/* Code for single pack file download */
+
+	fw_pack = "plfxlc/lifi-xl.bin";
+
+	r = request_firmware(&fwp, fw_pack, &intf->dev);
+	if (r) {
+		dev_err(&intf->dev, "Request_firmware failed (%d)\n", r);
+		return -EINVAL;
+	}
+	file.total_files = get_unaligned_le32(&fwp->data[0]);
+	file.total_size = get_unaligned_le32(&fwp->size);
+
+	dev_dbg(&intf->dev, "XL Firmware (%d, %d)\n",
+		file.total_files, file.total_size);
+
+	buf = kzalloc(PLF_XL_BUF_LEN, GFP_KERNEL);
+	if (!buf) {
+		release_firmware(fwp);
+		return -ENOMEM;
+	}
+
+	if (file.total_files > 10) {
+		dev_err(&intf->dev, "Too many files (%d)\n", file.total_files);
+		release_firmware(fwp);
+		kfree(buf);
+		return -EINVAL;
+	}
+
+	/* Download firmware files in multiple steps */
+	for (s = 0; s < file.total_files; s++) {
+		buf[0] = s;
+		r = send_vendor_command(udev, PLF_VNDR_XL_FILE_CMD, buf,
+					PLF_XL_BUF_LEN);
+
+		if (s < file.total_files - 1)
+			file.size = get_unaligned_le32(&fwp->data[4 + ((s + 1) * 4)])
+				    - get_unaligned_le32(&fwp->data[4 + (s) * 4]);
+		else
+			file.size = file.total_size -
+				    get_unaligned_le32(&fwp->data[4 + (s) * 4]);
+
+		if (file.size > file.total_size || file.size > 60000) {
+			dev_err(&intf->dev, "File size is too large (%d)\n", file.size);
+			break;
+		}
+
+		file.start_addr = get_unaligned_le32(&fwp->data[4 + (s * 4)]);
+
+		if (file.size % PLF_XL_BUF_LEN && s < 2)
+			file.size += PLF_XL_BUF_LEN - file.size % PLF_XL_BUF_LEN;
+
+		file.control_packets = file.size / PLF_XL_BUF_LEN;
+
+		for (i = 0; i < file.control_packets; i++) {
+			memcpy(buf,
+			       &fwp->data[file.start_addr + (i * PLF_XL_BUF_LEN)],
+			       PLF_XL_BUF_LEN);
+			r = send_vendor_command(udev, PLF_VNDR_XL_DATA_CMD, buf,
+						PLF_XL_BUF_LEN);
+		}
+		dev_dbg(&intf->dev, "fw-dw step=%d,r=%d size=%d\n", s, r,
+			file.size);
+	}
+	release_firmware(fwp);
+	kfree(buf);
+
+	/* Code for single pack file download ends fw download finish */
+
+	r = send_vendor_command(udev, PLF_VNDR_XL_EX_CMD, NULL, 0);
+	dev_dbg(&intf->dev, "Download fpga (4) (%d)\n", r);
+
+	return 0;
+}
+
+int plfxlc_upload_mac_and_serial(struct usb_interface *intf,
+				 unsigned char *hw_address,
+				 unsigned char *serial_number)
+{
+	struct usb_device *udev = interface_to_usbdev(intf);
+	unsigned long long firmware_version;
+	unsigned char *dma_buffer = NULL;
+
+	dma_buffer = kmalloc(PLF_SERIAL_LEN, GFP_KERNEL);
+	if (!dma_buffer)
+		return -ENOMEM;
+
+	BUILD_BUG_ON(ETH_ALEN > PLF_SERIAL_LEN);
+	BUILD_BUG_ON(PLF_FW_VER_LEN > PLF_SERIAL_LEN);
+
+	send_vendor_request(udev, PLF_MAC_VENDOR_REQUEST, dma_buffer,
+			    ETH_ALEN);
+
+	memcpy(hw_address, dma_buffer, ETH_ALEN);
+
+	send_vendor_request(udev, PLF_SERIAL_NUMBER_VENDOR_REQUEST,
+			    dma_buffer, PLF_SERIAL_LEN);
+
+	send_vendor_request(udev, PLF_SERIAL_NUMBER_VENDOR_REQUEST,
+			    dma_buffer, PLF_SERIAL_LEN);
+
+	memcpy(serial_number, dma_buffer, PLF_SERIAL_LEN);
+
+	memset(dma_buffer, 0x00, PLF_SERIAL_LEN);
+
+	send_vendor_request(udev, PLF_FIRMWARE_VERSION_VENDOR_REQUEST,
+			    (unsigned char *)dma_buffer, PLF_FW_VER_LEN);
+
+	memcpy(&firmware_version, dma_buffer, PLF_FW_VER_LEN);
+
+	dev_info(&intf->dev, "Firmware Version: %llu\n", firmware_version);
+	kfree(dma_buffer);
+
+	dev_dbg(&intf->dev, "Mac: %pM\n", hw_address);
+
+	return 0;
+}
+

drivers/net/wireless/purelifi/plfxlc/intf.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021 pureLiFi
+ */
+
+#define PURELIFI_BYTE_NUM_ALIGNMENT 4
+#define ETH_ALEN 6
+#define AP_USER_LIMIT 8
+
+#define PLF_VNDR_FPGA_STATE_REQ 0x30
+#define PLF_VNDR_FPGA_SET_REQ 0x33
+#define PLF_VNDR_FPGA_SET_CMD 0x34
+#define PLF_VNDR_FPGA_STATE_CMD 0x35
+
+#define PLF_VNDR_XL_FW_CMD 0x80
+#define PLF_VNDR_XL_DATA_CMD 0x81
+#define PLF_VNDR_XL_FILE_CMD 0x82
+#define PLF_VNDR_XL_EX_CMD 0x83
+
+#define PLF_MAC_VENDOR_REQUEST 0x36
+#define PLF_SERIAL_NUMBER_VENDOR_REQUEST 0x37
+#define PLF_FIRMWARE_VERSION_VENDOR_REQUEST 0x39
+#define PLF_SERIAL_LEN 14
+#define PLF_FW_VER_LEN 8
+
+struct rx_status {
+	__be16 rssi;
+	u8     rate_idx;
+	u8     pad;
+	__be64 crc_error_count;
+} __packed;
+
+enum plf_usb_req_enum {
+	USB_REQ_TEST_WR            = 0,
+	USB_REQ_MAC_WR             = 1,
+	USB_REQ_POWER_WR           = 2,
+	USB_REQ_RXTX_WR            = 3,
+	USB_REQ_BEACON_WR          = 4,
+	USB_REQ_BEACON_INTERVAL_WR = 5,
+	USB_REQ_RTS_CTS_RATE_WR    = 6,
+	USB_REQ_HASH_WR            = 7,
+	USB_REQ_DATA_TX            = 8,
+	USB_REQ_RATE_WR            = 9,
+	USB_REQ_SET_FREQ           = 15
+};
+
+struct plf_usb_req {
+	__be32         id; /* should be plf_usb_req_enum */
+	__be32	       len;
+	u8             buf[512];
+};
+

drivers/net/wireless/purelifi/plfxlc/mac.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 pureLiFi
+ */
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/gpio.h>
+#include <linux/jiffies.h>
+#include <net/ieee80211_radiotap.h>
+
+#include "chip.h"
+#include "mac.h"
+#include "usb.h"
+
+static const struct ieee80211_rate plfxlc_rates[] = {
+	{ .bitrate = 10,
+		.hw_value = PURELIFI_CCK_RATE_1M,
+		.flags = 0 },
+	{ .bitrate = 20,
+		.hw_value = PURELIFI_CCK_RATE_2M,
+		.hw_value_short = PURELIFI_CCK_RATE_2M
+			| PURELIFI_CCK_PREA_SHORT,
+		.flags = IEEE80211_RATE_SHORT_PREAMBLE },
+	{ .bitrate = 55,
+		.hw_value = PURELIFI_CCK_RATE_5_5M,
+		.hw_value_short = PURELIFI_CCK_RATE_5_5M
+			| PURELIFI_CCK_PREA_SHORT,
+		.flags = IEEE80211_RATE_SHORT_PREAMBLE },
+	{ .bitrate = 110,
+		.hw_value = PURELIFI_CCK_RATE_11M,
+		.hw_value_short = PURELIFI_CCK_RATE_11M
+			| PURELIFI_CCK_PREA_SHORT,
+		.flags = IEEE80211_RATE_SHORT_PREAMBLE },
+	{ .bitrate = 60,
+		.hw_value = PURELIFI_OFDM_RATE_6M,
+		.flags = 0 },
+	{ .bitrate = 90,
+		.hw_value = PURELIFI_OFDM_RATE_9M,
+		.flags = 0 },
+	{ .bitrate = 120,
+		.hw_value = PURELIFI_OFDM_RATE_12M,
+		.flags = 0 },
+	{ .bitrate = 180,
+		.hw_value = PURELIFI_OFDM_RATE_18M,
+		.flags = 0 },
+	{ .bitrate = 240,
+		.hw_value = PURELIFI_OFDM_RATE_24M,
+		.flags = 0 },
+	{ .bitrate = 360,
+		.hw_value = PURELIFI_OFDM_RATE_36M,
+		.flags = 0 },
+	{ .bitrate = 480,
+		.hw_value = PURELIFI_OFDM_RATE_48M,
+		.flags = 0 },
+	{ .bitrate = 540,
+		.hw_value = PURELIFI_OFDM_RATE_54M,
+		.flags = 0 }
+};
+
+static const struct ieee80211_channel plfxlc_channels[] = {
+	{ .center_freq = 2412, .hw_value = 1 },
+	{ .center_freq = 2417, .hw_value = 2 },
+	{ .center_freq = 2422, .hw_value = 3 },
+	{ .center_freq = 2427, .hw_value = 4 },
+	{ .center_freq = 2432, .hw_value = 5 },
+	{ .center_freq = 2437, .hw_value = 6 },
+	{ .center_freq = 2442, .hw_value = 7 },
+	{ .center_freq = 2447, .hw_value = 8 },
+	{ .center_freq = 2452, .hw_value = 9 },
+	{ .center_freq = 2457, .hw_value = 10 },
+	{ .center_freq = 2462, .hw_value = 11 },
+	{ .center_freq = 2467, .hw_value = 12 },
+	{ .center_freq = 2472, .hw_value = 13 },
+	{ .center_freq = 2484, .hw_value = 14 },
+};
+
+int plfxlc_mac_preinit_hw(struct ieee80211_hw *hw, const u8 *hw_address)
+{
+	SET_IEEE80211_PERM_ADDR(hw, hw_address);
+	return 0;
+}
+
+int plfxlc_mac_init_hw(struct ieee80211_hw *hw)
+{
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+	struct plfxlc_chip *chip = &mac->chip;
+	int r;
+
+	r = plfxlc_chip_init_hw(chip);
+	if (r) {
+		dev_warn(plfxlc_mac_dev(mac), "init hw failed (%d)\n", r);
+		return r;
+	}
+
+	dev_dbg(plfxlc_mac_dev(mac), "irq_disabled (%d)\n", irqs_disabled());
+	regulatory_hint(hw->wiphy, "00");
+	return r;
+}
+
+void plfxlc_mac_release(struct plfxlc_mac *mac)
+{
+	plfxlc_chip_release(&mac->chip);
+	lockdep_assert_held(&mac->lock);
+}
+
+int plfxlc_op_start(struct ieee80211_hw *hw)
+{
+	plfxlc_hw_mac(hw)->chip.usb.initialized = 1;
+	return 0;
+}
+
+void plfxlc_op_stop(struct ieee80211_hw *hw)
+{
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+
+	clear_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);
+}
+
+int plfxlc_restore_settings(struct plfxlc_mac *mac)
+{
+	int beacon_interval, beacon_period;
+	struct sk_buff *beacon;
+
+	spin_lock_irq(&mac->lock);
+	beacon_interval = mac->beacon.interval;
+	beacon_period = mac->beacon.period;
+	spin_unlock_irq(&mac->lock);
+
+	if (mac->type != NL80211_IFTYPE_ADHOC)
+		return 0;
+
+	if (mac->vif) {
+		beacon = ieee80211_beacon_get(mac->hw, mac->vif);
+		if (beacon) {
+			/*beacon is hardcoded in firmware */
+			kfree_skb(beacon);
+			/* Returned skb is used only once and lowlevel
+			 * driver is responsible for freeing it.
+			 */
+		}
+	}
+
+	plfxlc_set_beacon_interval(&mac->chip, beacon_interval,
+				   beacon_period, mac->type);
+
+	spin_lock_irq(&mac->lock);
+	mac->beacon.last_update = jiffies;
+	spin_unlock_irq(&mac->lock);
+
+	return 0;
+}
+
+static void plfxlc_mac_tx_status(struct ieee80211_hw *hw,
+				 struct sk_buff *skb,
+				 int ackssi,
+				 struct tx_status *tx_status)
+{
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	int success = 1;
+
+	ieee80211_tx_info_clear_status(info);
+	if (tx_status)
+		success = !tx_status->failure;
+
+	if (success)
+		info->flags |= IEEE80211_TX_STAT_ACK;
+	else
+		info->flags &= ~IEEE80211_TX_STAT_ACK;
+
+	info->status.ack_signal = 50;
+	ieee80211_tx_status_irqsafe(hw, skb);
+}
+
+void plfxlc_mac_tx_to_dev(struct sk_buff *skb, int error)
+{
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct ieee80211_hw *hw = info->rate_driver_data[0];
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+	struct sk_buff_head *q = NULL;
+
+	ieee80211_tx_info_clear_status(info);
+	skb_pull(skb, sizeof(struct plfxlc_ctrlset));
+
+	if (unlikely(error ||
+		     (info->flags & IEEE80211_TX_CTL_NO_ACK))) {
+		ieee80211_tx_status_irqsafe(hw, skb);
+		return;
+	}
+
+	q = &mac->ack_wait_queue;
+
+	skb_queue_tail(q, skb);
+	while (skb_queue_len(q)/* > PURELIFI_MAC_MAX_ACK_WAITERS*/) {
+		plfxlc_mac_tx_status(hw, skb_dequeue(q),
+				     mac->ack_pending ?
+				     mac->ack_signal : 0,
+				     NULL);
+		mac->ack_pending = 0;
+	}
+}
+
+static int plfxlc_fill_ctrlset(struct plfxlc_mac *mac, struct sk_buff *skb)
+{
+	unsigned int frag_len = skb->len;
+	struct plfxlc_ctrlset *cs;
+	u32 temp_payload_len = 0;
+	unsigned int tmp;
+	u32 temp_len = 0;
+
+	if (skb_headroom(skb) < sizeof(struct plfxlc_ctrlset)) {
+		dev_dbg(plfxlc_mac_dev(mac), "Not enough hroom(1)\n");
+		return 1;
+	}
+
+	cs = (void *)skb_push(skb, sizeof(struct plfxlc_ctrlset));
+	temp_payload_len = frag_len;
+	temp_len = temp_payload_len +
+		  sizeof(struct plfxlc_ctrlset) -
+		  sizeof(cs->id) - sizeof(cs->len);
+
+	/* Data packet lengths must be multiple of four bytes and must
+	 * not be a multiple of 512 bytes. First, it is attempted to
+	 * append the data packet in the tailroom of the skb. In rare
+	 * occasions, the tailroom is too small. In this case, the
+	 * content of the packet is shifted into the headroom of the skb
+	 * by memcpy. Headroom is allocated at startup (below in this
+	 * file). Therefore, there will be always enough headroom. The
+	 * call skb_headroom is an additional safety which might be
+	 * dropped.
+	 */
+	/* check if 32 bit aligned and align data */
+	tmp = skb->len & 3;
+	if (tmp) {
+		if (skb_tailroom(skb) < (3 - tmp)) {
+			if (skb_headroom(skb) >= 4 - tmp) {
+				u8 len;
+				u8 *src_pt;
+				u8 *dest_pt;
+
+				len = skb->len;
+				src_pt = skb->data;
+				dest_pt = skb_push(skb, 4 - tmp);
+				memmove(dest_pt, src_pt, len);
+			} else {
+				return -ENOBUFS;
+			}
+		} else {
+			skb_put(skb, 4 - tmp);
+		}
+		temp_len += 4 - tmp;
+	}
+
+	/* check if not multiple of 512 and align data */
+	tmp = skb->len & 0x1ff;
+	if (!tmp) {
+		if (skb_tailroom(skb) < 4) {
+			if (skb_headroom(skb) >= 4) {
+				u8 len = skb->len;
+				u8 *src_pt = skb->data;
+				u8 *dest_pt = skb_push(skb, 4);
+
+				memmove(dest_pt, src_pt, len);
+			} else {
+				/* should never happen because
+				 * sufficient headroom was reserved
+				 */
+				return -ENOBUFS;
+			}
+		} else {
+			skb_put(skb, 4);
+		}
+		temp_len += 4;
+	}
+
+	cs->id = cpu_to_be32(USB_REQ_DATA_TX);
+	cs->len = cpu_to_be32(temp_len);
+	cs->payload_len_nw = cpu_to_be32(temp_payload_len);
+
+	return 0;
+}
+
+static void plfxlc_op_tx(struct ieee80211_hw *hw,
+			 struct ieee80211_tx_control *control,
+			 struct sk_buff *skb)
+{
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct plfxlc_header *plhdr = (void *)skb->data;
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+	struct plfxlc_usb *usb = &mac->chip.usb;
+	unsigned long flags;
+	int r;
+
+	r = plfxlc_fill_ctrlset(mac, skb);
+	if (r)
+		goto fail;
+
+	info->rate_driver_data[0] = hw;
+
+	if (plhdr->frametype  == IEEE80211_FTYPE_DATA) {
+		u8 *dst_mac = plhdr->dmac;
+		u8 sidx;
+		bool found = false;
+		struct plfxlc_usb_tx *tx = &usb->tx;
+
+		for (sidx = 0; sidx < MAX_STA_NUM; sidx++) {
+			if (!(tx->station[sidx].flag & STATION_CONNECTED_FLAG))
+				continue;
+			if (memcmp(tx->station[sidx].mac, dst_mac, ETH_ALEN))
+				continue;
+			found = true;
+			break;
+		}
+
+		/* Default to broadcast address for unknown MACs */
+		if (!found)
+			sidx = STA_BROADCAST_INDEX;
+
+		/* Stop OS from sending packets, if the queue is half full */
+		if (skb_queue_len(&tx->station[sidx].data_list) > 60)
+			ieee80211_stop_queues(plfxlc_usb_to_hw(usb));
+
+		/* Schedule packet for transmission if queue is not full */
+		if (skb_queue_len(&tx->station[sidx].data_list) > 256)
+			goto fail;
+		skb_queue_tail(&tx->station[sidx].data_list, skb);
+		plfxlc_send_packet_from_data_queue(usb);
+
+	} else {
+		spin_lock_irqsave(&usb->tx.lock, flags);
+		r = plfxlc_usb_wreq_async(&mac->chip.usb, skb->data, skb->len,
+					  USB_REQ_DATA_TX, plfxlc_tx_urb_complete, skb);
+		spin_unlock_irqrestore(&usb->tx.lock, flags);
+		if (r)
+			goto fail;
+	}
+	return;
+
+fail:
+	dev_kfree_skb(skb);
+}
+
+static int plfxlc_filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr,
+			     struct ieee80211_rx_status *stats)
+{
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+	struct sk_buff_head *q;
+	int i, position = 0;
+	unsigned long flags;
+	struct sk_buff *skb;
+	bool found = false;
+
+	if (!ieee80211_is_ack(rx_hdr->frame_control))
+		return 0;
+
+	dev_dbg(plfxlc_mac_dev(mac), "ACK Received\n");
+
+	/* code based on zy driver, this logic may need fix */
+	q = &mac->ack_wait_queue;
+	spin_lock_irqsave(&q->lock, flags);
+
+	skb_queue_walk(q, skb) {
+		struct ieee80211_hdr *tx_hdr;
+
+		position++;
+
+		if (mac->ack_pending && skb_queue_is_first(q, skb))
+			continue;
+		if (mac->ack_pending == 0)
+			break;
+
+		tx_hdr = (struct ieee80211_hdr *)skb->data;
+		if (likely(ether_addr_equal(tx_hdr->addr2, rx_hdr->addr1))) {
+			found = 1;
+			break;
+		}
+	}
+
+	if (found) {
+		for (i = 1; i < position; i++)
+			skb = __skb_dequeue(q);
+		if (i == position) {
+			plfxlc_mac_tx_status(hw, skb,
+					     mac->ack_pending ?
+					     mac->ack_signal : 0,
+					     NULL);
+			mac->ack_pending = 0;
+		}
+
+		mac->ack_pending = skb_queue_len(q) ? 1 : 0;
+		mac->ack_signal = stats->signal;
+	}
+
+	spin_unlock_irqrestore(&q->lock, flags);
+	return 1;
+}
+
+int plfxlc_mac_rx(struct ieee80211_hw *hw, const u8 *buffer,
+		  unsigned int length)
+{
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+	struct ieee80211_rx_status stats;
+	const struct rx_status *status;
+	unsigned int payload_length;
+	struct plfxlc_usb_tx *tx;
+	struct sk_buff *skb;
+	int need_padding;
+	__le16 fc;
+	int sidx;
+
+	/* Packet blockade during disabled interface. */
+	if (!mac->vif)
+		return 0;
+
+	status = (struct rx_status *)buffer;
+
+	memset(&stats, 0, sizeof(stats));
+
+	stats.flag     = 0;
+	stats.freq     = 2412;
+	stats.band     = NL80211_BAND_LC;
+	mac->rssi      = -15 * be16_to_cpu(status->rssi) / 10;
+
+	stats.signal   = mac->rssi;
+
+	if (status->rate_idx > 7)
+		stats.rate_idx = 0;
+	else
+		stats.rate_idx = status->rate_idx;
+
+	mac->crc_errors = be64_to_cpu(status->crc_error_count);
+
+	/* TODO bad frame check for CRC error*/
+	if (plfxlc_filter_ack(hw, (struct ieee80211_hdr *)buffer, &stats) &&
+	    !mac->pass_ctrl)
+		return 0;
+
+	buffer += sizeof(struct rx_status);
+	payload_length = get_unaligned_be32(buffer);
+
+	if (payload_length > 1560) {
+		dev_err(plfxlc_mac_dev(mac), " > MTU %u\n", payload_length);
+		return 0;
+	}
+	buffer += sizeof(u32);
+
+	fc = get_unaligned((__le16 *)buffer);
+	need_padding = ieee80211_is_data_qos(fc) ^ ieee80211_has_a4(fc);
+
+	tx = &mac->chip.usb.tx;
+
+	for (sidx = 0; sidx < MAX_STA_NUM - 1; sidx++) {
+		if (memcmp(&buffer[10], tx->station[sidx].mac, ETH_ALEN))
+			continue;
+		if (tx->station[sidx].flag & STATION_CONNECTED_FLAG) {
+			tx->station[sidx].flag |= STATION_HEARTBEAT_FLAG;
+			break;
+		}
+	}
+
+	if (sidx == MAX_STA_NUM - 1) {
+		for (sidx = 0; sidx < MAX_STA_NUM - 1; sidx++) {
+			if (tx->station[sidx].flag & STATION_CONNECTED_FLAG)
+				continue;
+			memcpy(tx->station[sidx].mac, &buffer[10], ETH_ALEN);
+			tx->station[sidx].flag |= STATION_CONNECTED_FLAG;
+			tx->station[sidx].flag |= STATION_HEARTBEAT_FLAG;
+			break;
+		}
+	}
+
+	switch (buffer[0]) {
+	case IEEE80211_STYPE_PROBE_REQ:
+		dev_dbg(plfxlc_mac_dev(mac), "Probe request\n");
+		break;
+	case IEEE80211_STYPE_ASSOC_REQ:
+		dev_dbg(plfxlc_mac_dev(mac), "Association request\n");
+		break;
+	case IEEE80211_STYPE_AUTH:
+		dev_dbg(plfxlc_mac_dev(mac), "Authentication req\n");
+		break;
+	case IEEE80211_FTYPE_DATA:
+		dev_dbg(plfxlc_mac_dev(mac), "802.11 data frame\n");
+		break;
+	}
+
+	skb = dev_alloc_skb(payload_length + (need_padding ? 2 : 0));
+	if (!skb)
+		return -ENOMEM;
+
+	if (need_padding)
+		/* Make sure that the payload data is 4 byte aligned. */
+		skb_reserve(skb, 2);
+
+	skb_put_data(skb, buffer, payload_length);
+	memcpy(IEEE80211_SKB_RXCB(skb), &stats, sizeof(stats));
+	ieee80211_rx_irqsafe(hw, skb);
+	return 0;
+}
+
+static int plfxlc_op_add_interface(struct ieee80211_hw *hw,
+				   struct ieee80211_vif *vif)
+{
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+	static const char * const iftype80211[] = {
+		[NL80211_IFTYPE_STATION]	= "Station",
+		[NL80211_IFTYPE_ADHOC]		= "Adhoc"
+	};
+
+	if (mac->type != NL80211_IFTYPE_UNSPECIFIED)
+		return -EOPNOTSUPP;
+
+	if (vif->type == NL80211_IFTYPE_ADHOC ||
+	    vif->type == NL80211_IFTYPE_STATION) {
+		dev_dbg(plfxlc_mac_dev(mac), "%s %s\n", __func__,
+			iftype80211[vif->type]);
+		mac->type = vif->type;
+		mac->vif = vif;
+		return 0;
+	}
+	dev_dbg(plfxlc_mac_dev(mac), "unsupported iftype\n");
+	return -EOPNOTSUPP;
+}
+
+static void plfxlc_op_remove_interface(struct ieee80211_hw *hw,
+				       struct ieee80211_vif *vif)
+{
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+
+	mac->type = NL80211_IFTYPE_UNSPECIFIED;
+	mac->vif = NULL;
+}
+
+static int plfxlc_op_config(struct ieee80211_hw *hw, u32 changed)
+{
+	return 0;
+}
+
+#define SUPPORTED_FIF_FLAGS \
+	(FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \
+	 FIF_OTHER_BSS | FIF_BCN_PRBRESP_PROMISC)
+static void plfxlc_op_configure_filter(struct ieee80211_hw *hw,
+				       unsigned int changed_flags,
+				       unsigned int *new_flags,
+				       u64 multicast)
+{
+	struct plfxlc_mc_hash hash = {
+		.low = multicast,
+		.high = multicast >> 32,
+	};
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+	unsigned long flags;
+
+	/* Only deal with supported flags */
+	*new_flags &= SUPPORTED_FIF_FLAGS;
+
+	/* If multicast parameter
+	 * (as returned by plfxlc_op_prepare_multicast)
+	 * has changed, no bit in changed_flags is set. To handle this
+	 * situation, we do not return if changed_flags is 0. If we do so,
+	 * we will have some issue with IPv6 which uses multicast for link
+	 * layer address resolution.
+	 */
+	if (*new_flags & (FIF_ALLMULTI))
+		plfxlc_mc_add_all(&hash);
+
+	spin_lock_irqsave(&mac->lock, flags);
+	mac->pass_failed_fcs = !!(*new_flags & FIF_FCSFAIL);
+	mac->pass_ctrl = !!(*new_flags & FIF_CONTROL);
+	mac->multicast_hash = hash;
+	spin_unlock_irqrestore(&mac->lock, flags);
+
+	/* no handling required for FIF_OTHER_BSS as we don't currently
+	 * do BSSID filtering
+	 */
+	/* FIXME: in future it would be nice to enable the probe response
+	 * filter (so that the driver doesn't see them) until
+	 * FIF_BCN_PRBRESP_PROMISC is set. however due to atomicity here, we'd
+	 * have to schedule work to enable prbresp reception, which might
+	 * happen too late. For now we'll just listen and forward them all the
+	 * time.
+	 */
+}
+
+static void plfxlc_op_bss_info_changed(struct ieee80211_hw *hw,
+				       struct ieee80211_vif *vif,
+				       struct ieee80211_bss_conf *bss_conf,
+				       u32 changes)
+{
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+	int associated;
+
+	dev_dbg(plfxlc_mac_dev(mac), "changes: %x\n", changes);
+
+	if (mac->type != NL80211_IFTYPE_ADHOC) { /* for STATION */
+		associated = is_valid_ether_addr(bss_conf->bssid);
+		goto exit_all;
+	}
+	/* for ADHOC */
+	associated = true;
+	if (changes & BSS_CHANGED_BEACON) {
+		struct sk_buff *beacon = ieee80211_beacon_get(hw, vif);
+
+		if (beacon) {
+			/*beacon is hardcoded in firmware */
+			kfree_skb(beacon);
+			/*Returned skb is used only once and
+			 * low-level driver is
+			 * responsible for freeing it.
+			 */
+		}
+	}
+
+	if (changes & BSS_CHANGED_BEACON_ENABLED) {
+		u16 interval = 0;
+		u8 period = 0;
+
+		if (bss_conf->enable_beacon) {
+			period = bss_conf->dtim_period;
+			interval = bss_conf->beacon_int;
+		}
+
+		spin_lock_irq(&mac->lock);
+		mac->beacon.period = period;
+		mac->beacon.interval = interval;
+		mac->beacon.last_update = jiffies;
+		spin_unlock_irq(&mac->lock);
+
+		plfxlc_set_beacon_interval(&mac->chip, interval,
+					   period, mac->type);
+	}
+exit_all:
+	spin_lock_irq(&mac->lock);
+	mac->associated = associated;
+	spin_unlock_irq(&mac->lock);
+}
+
+static int plfxlc_get_stats(struct ieee80211_hw *hw,
+			    struct ieee80211_low_level_stats *stats)
+{
+	stats->dot11ACKFailureCount = 0;
+	stats->dot11RTSFailureCount = 0;
+	stats->dot11FCSErrorCount   = 0;
+	stats->dot11RTSSuccessCount = 0;
+	return 0;
+}
+
+static const char et_strings[][ETH_GSTRING_LEN] = {
+	"phy_rssi",
+	"phy_rx_crc_err"
+};
+
+static int plfxlc_get_et_sset_count(struct ieee80211_hw *hw,
+				    struct ieee80211_vif *vif, int sset)
+{
+	if (sset == ETH_SS_STATS)
+		return ARRAY_SIZE(et_strings);
+
+	return 0;
+}
+
+static void plfxlc_get_et_strings(struct ieee80211_hw *hw,
+				  struct ieee80211_vif *vif,
+				  u32 sset, u8 *data)
+{
+	if (sset == ETH_SS_STATS)
+		memcpy(data, *et_strings, sizeof(et_strings));
+}
+
+static void plfxlc_get_et_stats(struct ieee80211_hw *hw,
+				struct ieee80211_vif *vif,
+				struct ethtool_stats *stats, u64 *data)
+{
+	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
+
+	data[0] = mac->rssi;
+	data[1] = mac->crc_errors;
+}
+
+static int plfxlc_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
+{
+	return 0;
+}
+
+static const struct ieee80211_ops plfxlc_ops = {
+	.tx = plfxlc_op_tx,
+	.start = plfxlc_op_start,
+	.stop = plfxlc_op_stop,
+	.add_interface = plfxlc_op_add_interface,
+	.remove_interface = plfxlc_op_remove_interface,
+	.set_rts_threshold = plfxlc_set_rts_threshold,
+	.config = plfxlc_op_config,
+	.configure_filter = plfxlc_op_configure_filter,
+	.bss_info_changed = plfxlc_op_bss_info_changed,
+	.get_stats = plfxlc_get_stats,
+	.get_et_sset_count = plfxlc_get_et_sset_count,
+	.get_et_stats = plfxlc_get_et_stats,
+	.get_et_strings = plfxlc_get_et_strings,
+};
+
+struct ieee80211_hw *plfxlc_mac_alloc_hw(struct usb_interface *intf)
+{
+	struct ieee80211_hw *hw;
+	struct plfxlc_mac *mac;
+
+	hw = ieee80211_alloc_hw(sizeof(struct plfxlc_mac), &plfxlc_ops);
+	if (!hw) {
+		dev_dbg(&intf->dev, "out of memory\n");
+		return NULL;
+	}
+	set_wiphy_dev(hw->wiphy, &intf->dev);
+
+	mac = plfxlc_hw_mac(hw);
+	memset(mac, 0, sizeof(*mac));
+	spin_lock_init(&mac->lock);
+	mac->hw = hw;
+
+	mac->type = NL80211_IFTYPE_UNSPECIFIED;
+
+	memcpy(mac->channels, plfxlc_channels, sizeof(plfxlc_channels));
+	memcpy(mac->rates, plfxlc_rates, sizeof(plfxlc_rates));
+	mac->band.n_bitrates = ARRAY_SIZE(plfxlc_rates);
+	mac->band.bitrates = mac->rates;
+	mac->band.n_channels = ARRAY_SIZE(plfxlc_channels);
+	mac->band.channels = mac->channels;
+	hw->wiphy->bands[NL80211_BAND_LC] = &mac->band;
+	hw->conf.chandef.width = NL80211_CHAN_WIDTH_20;
+
+	ieee80211_hw_set(hw, RX_INCLUDES_FCS);
+	ieee80211_hw_set(hw, SIGNAL_DBM);
+	ieee80211_hw_set(hw, HOST_BROADCAST_PS_BUFFERING);
+	ieee80211_hw_set(hw, MFP_CAPABLE);
+
+	hw->wiphy->interface_modes =
+		BIT(NL80211_IFTYPE_STATION) |
+		BIT(NL80211_IFTYPE_ADHOC);
+	hw->max_signal = 100;
+	hw->queues = 1;
+	/* 4 for 32 bit alignment if no tailroom */
+	hw->extra_tx_headroom = sizeof(struct plfxlc_ctrlset) + 4;
+	/* Tell mac80211 that we support multi rate retries */
+	hw->max_rates = IEEE80211_TX_MAX_RATES;
+	hw->max_rate_tries = 18;   /* 9 rates * 2 retries/rate */
+
+	skb_queue_head_init(&mac->ack_wait_queue);
+	mac->ack_pending = 0;
+
+	plfxlc_chip_init(&mac->chip, hw, intf);
+
+	SET_IEEE80211_DEV(hw, &intf->dev);
+	return hw;
+}

drivers/net/wireless/purelifi/plfxlc/mac.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021 pureLiFi
+ */
+
+#ifndef PLFXLC_MAC_H
+#define PLFXLC_MAC_H
+
+#include <linux/kernel.h>
+#include <net/mac80211.h>
+
+#include "chip.h"
+
+#define PURELIFI_CCK                  0x00
+#define PURELIFI_OFDM                 0x10
+#define PURELIFI_CCK_PREA_SHORT       0x20
+
+#define PURELIFI_OFDM_PLCP_RATE_6M	0xb
+#define PURELIFI_OFDM_PLCP_RATE_9M	0xf
+#define PURELIFI_OFDM_PLCP_RATE_12M	0xa
+#define PURELIFI_OFDM_PLCP_RATE_18M	0xe
+#define PURELIFI_OFDM_PLCP_RATE_24M	0x9
+#define PURELIFI_OFDM_PLCP_RATE_36M	0xd
+#define PURELIFI_OFDM_PLCP_RATE_48M	0x8
+#define PURELIFI_OFDM_PLCP_RATE_54M	0xc
+
+#define PURELIFI_CCK_RATE_1M	(PURELIFI_CCK | 0x00)
+#define PURELIFI_CCK_RATE_2M	(PURELIFI_CCK | 0x01)
+#define PURELIFI_CCK_RATE_5_5M	(PURELIFI_CCK | 0x02)
+#define PURELIFI_CCK_RATE_11M	(PURELIFI_CCK | 0x03)
+#define PURELIFI_OFDM_RATE_6M	(PURELIFI_OFDM | PURELIFI_OFDM_PLCP_RATE_6M)
+#define PURELIFI_OFDM_RATE_9M	(PURELIFI_OFDM | PURELIFI_OFDM_PLCP_RATE_9M)
+#define PURELIFI_OFDM_RATE_12M	(PURELIFI_OFDM | PURELIFI_OFDM_PLCP_RATE_12M)
+#define PURELIFI_OFDM_RATE_18M	(PURELIFI_OFDM | PURELIFI_OFDM_PLCP_RATE_18M)
+#define PURELIFI_OFDM_RATE_24M	(PURELIFI_OFDM | PURELIFI_OFDM_PLCP_RATE_24M)
+#define PURELIFI_OFDM_RATE_36M	(PURELIFI_OFDM | PURELIFI_OFDM_PLCP_RATE_36M)
+#define PURELIFI_OFDM_RATE_48M	(PURELIFI_OFDM | PURELIFI_OFDM_PLCP_RATE_48M)
+#define PURELIFI_OFDM_RATE_54M	(PURELIFI_OFDM | PURELIFI_OFDM_PLCP_RATE_54M)
+
+#define PURELIFI_RX_ERROR		0x80
+#define PURELIFI_RX_CRC32_ERROR		0x10
+
+#define PLF_REGDOMAIN_FCC	0x10
+#define PLF_REGDOMAIN_IC	0x20
+#define PLF_REGDOMAIN_ETSI	0x30
+#define PLF_REGDOMAIN_SPAIN	0x31
+#define PLF_REGDOMAIN_FRANCE	0x32
+#define PLF_REGDOMAIN_JAPAN_2	0x40
+#define PLF_REGDOMAIN_JAPAN	0x41
+#define PLF_REGDOMAIN_JAPAN_3	0x49
+
+#define PLF_RX_ERROR		0x80
+#define PLF_RX_CRC32_ERROR	0x10
+
+enum {
+	MODULATION_RATE_BPSK_1_2 = 0,
+	MODULATION_RATE_BPSK_3_4,
+	MODULATION_RATE_QPSK_1_2,
+	MODULATION_RATE_QPSK_3_4,
+	MODULATION_RATE_QAM16_1_2,
+	MODULATION_RATE_QAM16_3_4,
+	MODULATION_RATE_QAM64_1_2,
+	MODULATION_RATE_QAM64_3_4,
+	MODULATION_RATE_AUTO,
+	MODULATION_RATE_NUM
+};
+
+#define plfxlc_mac_dev(mac) plfxlc_chip_dev(&(mac)->chip)
+
+#define PURELIFI_MAC_STATS_BUFFER_SIZE 16
+#define PURELIFI_MAC_MAX_ACK_WAITERS 50
+
+struct plfxlc_ctrlset {
+	/* id should be plf_usb_req_enum */
+	__be32		id;
+	__be32		len;
+	u8		modulation;
+	u8		control;
+	u8		service;
+	u8		pad;
+	__le16		packet_length;
+	__le16		current_length;
+	__le16		next_frame_length;
+	__le16		tx_length;
+	__be32		payload_len_nw;
+} __packed;
+
+/* overlay */
+struct plfxlc_header {
+	struct plfxlc_ctrlset plf_ctrl;
+	u32    frametype;
+	u8    *dmac;
+} __packed;
+
+struct tx_status {
+	u8 type;
+	u8 id;
+	u8 rate;
+	u8 pad;
+	u8 mac[ETH_ALEN];
+	u8 retry;
+	u8 failure;
+} __packed;
+
+struct beacon {
+	struct delayed_work watchdog_work;
+	struct sk_buff *cur_beacon;
+	unsigned long last_update;
+	u16 interval;
+	u8 period;
+};
+
+enum plfxlc_device_flags {
+	PURELIFI_DEVICE_RUNNING,
+};
+
+struct plfxlc_mac {
+	struct ieee80211_hw *hw;
+	struct ieee80211_vif *vif;
+	struct beacon beacon;
+	struct work_struct set_rts_cts_work;
+	struct work_struct process_intr;
+	struct plfxlc_mc_hash multicast_hash;
+	struct sk_buff_head ack_wait_queue;
+	struct ieee80211_channel channels[14];
+	struct ieee80211_rate rates[12];
+	struct ieee80211_supported_band band;
+	struct plfxlc_chip chip;
+	spinlock_t lock; /* lock for mac data */
+	u8 intr_buffer[USB_MAX_EP_INT_BUFFER];
+	char serial_number[PURELIFI_SERIAL_LEN];
+	unsigned char hw_address[ETH_ALEN];
+	u8 default_regdomain;
+	unsigned long flags;
+	bool pass_failed_fcs;
+	bool pass_ctrl;
+	bool ack_pending;
+	int ack_signal;
+	int associated;
+	u8 regdomain;
+	u8 channel;
+	int type;
+	u64 crc_errors;
+	u64 rssi;
+};
+
+static inline struct plfxlc_mac *
+plfxlc_hw_mac(struct ieee80211_hw *hw)
+{
+	return hw->priv;
+}
+
+static inline struct plfxlc_mac *
+plfxlc_chip_to_mac(struct plfxlc_chip *chip)
+{
+	return container_of(chip, struct plfxlc_mac, chip);
+}
+
+static inline struct plfxlc_mac *
+plfxlc_usb_to_mac(struct plfxlc_usb *usb)
+{
+	return plfxlc_chip_to_mac(plfxlc_usb_to_chip(usb));
+}
+
+static inline u8 *plfxlc_mac_get_perm_addr(struct plfxlc_mac *mac)
+{
+	return mac->hw->wiphy->perm_addr;
+}
+
+struct ieee80211_hw *plfxlc_mac_alloc_hw(struct usb_interface *intf);
+void plfxlc_mac_release(struct plfxlc_mac *mac);
+
+int plfxlc_mac_preinit_hw(struct ieee80211_hw *hw, const u8 *hw_address);
+int plfxlc_mac_init_hw(struct ieee80211_hw *hw);
+
+int plfxlc_mac_rx(struct ieee80211_hw *hw, const u8 *buffer,
+		  unsigned int length);
+void plfxlc_mac_tx_failed(struct urb *urb);
+void plfxlc_mac_tx_to_dev(struct sk_buff *skb, int error);
+int plfxlc_op_start(struct ieee80211_hw *hw);
+void plfxlc_op_stop(struct ieee80211_hw *hw);
+int plfxlc_restore_settings(struct plfxlc_mac *mac);
+
+#endif /* PLFXLC_MAC_H */

drivers/net/wireless/purelifi/plfxlc/usb.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 pureLiFi
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/usb.h>
+#include <linux/workqueue.h>
+#include <linux/proc_fs.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <net/mac80211.h>
+#include <asm/unaligned.h>
+#include <linux/version.h>
+#include <linux/sysfs.h>
+
+#include "mac.h"
+#include "usb.h"
+#include "chip.h"
+
+static const struct usb_device_id usb_ids[] = {
+	{ USB_DEVICE(PURELIFI_X_VENDOR_ID_0, PURELIFI_X_PRODUCT_ID_0),
+	  .driver_info = DEVICE_LIFI_X },
+	{ USB_DEVICE(PURELIFI_XC_VENDOR_ID_0, PURELIFI_XC_PRODUCT_ID_0),
+	  .driver_info = DEVICE_LIFI_XC },
+	{ USB_DEVICE(PURELIFI_XL_VENDOR_ID_0, PURELIFI_XL_PRODUCT_ID_0),
+	  .driver_info = DEVICE_LIFI_XL },
+	{}
+};
+
+void plfxlc_send_packet_from_data_queue(struct plfxlc_usb *usb)
+{
+	struct plfxlc_usb_tx *tx = &usb->tx;
+	struct sk_buff *skb = NULL;
+	unsigned long flags;
+	u8 last_served_sidx;
+
+	spin_lock_irqsave(&tx->lock, flags);
+	last_served_sidx = usb->sidx;
+	do {
+		usb->sidx = (usb->sidx + 1) % MAX_STA_NUM;
+		if (!(tx->station[usb->sidx].flag & STATION_CONNECTED_FLAG))
+			continue;
+		if (!(tx->station[usb->sidx].flag & STATION_FIFO_FULL_FLAG))
+			skb = skb_peek(&tx->station[usb->sidx].data_list);
+	} while ((usb->sidx != last_served_sidx) && (!skb));
+
+	if (skb) {
+		skb = skb_dequeue(&tx->station[usb->sidx].data_list);
+		plfxlc_usb_wreq_async(usb, skb->data, skb->len, USB_REQ_DATA_TX,
+				      plfxlc_tx_urb_complete, skb);
+		if (skb_queue_len(&tx->station[usb->sidx].data_list) <= 60)
+			ieee80211_wake_queues(plfxlc_usb_to_hw(usb));
+	}
+	spin_unlock_irqrestore(&tx->lock, flags);
+}
+
+static void handle_rx_packet(struct plfxlc_usb *usb, const u8 *buffer,
+			     unsigned int length)
+{
+	plfxlc_mac_rx(plfxlc_usb_to_hw(usb), buffer, length);
+}
+
+static void rx_urb_complete(struct urb *urb)
+{
+	struct plfxlc_usb_tx *tx;
+	struct plfxlc_usb *usb;
+	unsigned int length;
+	const u8 *buffer;
+	u16 status;
+	u8 sidx;
+	int r;
+
+	if (!urb) {
+		pr_err("urb is NULL\n");
+		return;
+	}
+	if (!urb->context) {
+		pr_err("urb ctx is NULL\n");
+		return;
+	}
+	usb = urb->context;
+
+	if (usb->initialized != 1) {
+		pr_err("usb is not initialized\n");
+		return;
+	}
+
+	tx = &usb->tx;
+	switch (urb->status) {
+	case 0:
+		break;
+	case -ESHUTDOWN:
+	case -EINVAL:
+	case -ENODEV:
+	case -ENOENT:
+	case -ECONNRESET:
+	case -EPIPE:
+		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
+		return;
+	default:
+		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
+		if (tx->submitted_urbs++ < PURELIFI_URB_RETRY_MAX) {
+			dev_dbg(plfxlc_urb_dev(urb), "urb %p resubmit %d", urb,
+				tx->submitted_urbs++);
+			goto resubmit;
+		} else {
+			dev_dbg(plfxlc_urb_dev(urb), "urb %p  max resubmits reached", urb);
+			tx->submitted_urbs = 0;
+			return;
+		}
+	}
+
+	buffer = urb->transfer_buffer;
+	length = le32_to_cpu(*(__le32 *)(buffer + sizeof(struct rx_status)))
+		 + sizeof(u32);
+
+	if (urb->actual_length != (PLF_MSG_STATUS_OFFSET + 1)) {
+		if (usb->initialized && usb->link_up)
+			handle_rx_packet(usb, buffer, length);
+		goto resubmit;
+	}
+
+	status = buffer[PLF_MSG_STATUS_OFFSET];
+
+	switch (status) {
+	case STATION_FIFO_ALMOST_FULL_NOT_MESSAGE:
+		dev_dbg(&usb->intf->dev,
+			"FIFO full not packet receipt\n");
+		tx->mac_fifo_full = 1;
+		for (sidx = 0; sidx < MAX_STA_NUM; sidx++)
+			tx->station[sidx].flag |= STATION_FIFO_FULL_FLAG;
+		break;
+	case STATION_FIFO_ALMOST_FULL_MESSAGE:
+		dev_dbg(&usb->intf->dev, "FIFO full packet receipt\n");
+
+		for (sidx = 0; sidx < MAX_STA_NUM; sidx++)
+			tx->station[sidx].flag &= STATION_ACTIVE_FLAG;
+
+		plfxlc_send_packet_from_data_queue(usb);
+		break;
+	case STATION_CONNECT_MESSAGE:
+		usb->link_up = 1;
+		dev_dbg(&usb->intf->dev, "ST_CONNECT_MSG packet receipt\n");
+		break;
+	case STATION_DISCONNECT_MESSAGE:
+		usb->link_up = 0;
+		dev_dbg(&usb->intf->dev, "ST_DISCONN_MSG packet receipt\n");
+		break;
+	default:
+		dev_dbg(&usb->intf->dev, "Unknown packet receipt\n");
+		break;
+	}
+
+resubmit:
+	r = usb_submit_urb(urb, GFP_ATOMIC);
+	if (r)
+		dev_dbg(plfxlc_urb_dev(urb), "urb %p resubmit fail (%d)\n", urb, r);
+}
+
+static struct urb *alloc_rx_urb(struct plfxlc_usb *usb)
+{
+	struct usb_device *udev = plfxlc_usb_to_usbdev(usb);
+	struct urb *urb;
+	void *buffer;
+
+	urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!urb)
+		return NULL;
+
+	buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
+				    &urb->transfer_dma);
+	if (!buffer) {
+		usb_free_urb(urb);
+		return NULL;
+	}
+
+	usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
+			  buffer, USB_MAX_RX_SIZE,
+			  rx_urb_complete, usb);
+	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+	return urb;
+}
+
+static void free_rx_urb(struct urb *urb)
+{
+	if (!urb)
+		return;
+	usb_free_coherent(urb->dev, urb->transfer_buffer_length,
+			  urb->transfer_buffer, urb->transfer_dma);
+	usb_free_urb(urb);
+}
+
+static int __lf_x_usb_enable_rx(struct plfxlc_usb *usb)
+{
+	struct plfxlc_usb_rx *rx = &usb->rx;
+	struct urb **urbs;
+	int i, r;
+
+	r = -ENOMEM;
+	urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
+	if (!urbs)
+		goto error;
+
+	for (i = 0; i < RX_URBS_COUNT; i++) {
+		urbs[i] = alloc_rx_urb(usb);
+		if (!urbs[i])
+			goto error;
+	}
+
+	spin_lock_irq(&rx->lock);
+
+	dev_dbg(plfxlc_usb_dev(usb), "irq_disabled %d\n", irqs_disabled());
+
+	if (rx->urbs) {
+		spin_unlock_irq(&rx->lock);
+		r = 0;
+		goto error;
+	}
+	rx->urbs = urbs;
+	rx->urbs_count = RX_URBS_COUNT;
+	spin_unlock_irq(&rx->lock);
+
+	for (i = 0; i < RX_URBS_COUNT; i++) {
+		r = usb_submit_urb(urbs[i], GFP_KERNEL);
+		if (r)
+			goto error_submit;
+	}
+
+	return 0;
+
+error_submit:
+	for (i = 0; i < RX_URBS_COUNT; i++)
+		usb_kill_urb(urbs[i]);
+	spin_lock_irq(&rx->lock);
+	rx->urbs = NULL;
+	rx->urbs_count = 0;
+	spin_unlock_irq(&rx->lock);
+error:
+	if (urbs) {
+		for (i = 0; i < RX_URBS_COUNT; i++)
+			free_rx_urb(urbs[i]);
+	}
+	return r;
+}
+
+int plfxlc_usb_enable_rx(struct plfxlc_usb *usb)
+{
+	struct plfxlc_usb_rx *rx = &usb->rx;
+	int r;
+
+	mutex_lock(&rx->setup_mutex);
+	r = __lf_x_usb_enable_rx(usb);
+	if (!r)
+		usb->rx_usb_enabled = 1;
+
+	mutex_unlock(&rx->setup_mutex);
+
+	return r;
+}
+
+static void __lf_x_usb_disable_rx(struct plfxlc_usb *usb)
+{
+	struct plfxlc_usb_rx *rx = &usb->rx;
+	unsigned long flags;
+	unsigned int count;
+	struct urb **urbs;
+	int i;
+
+	spin_lock_irqsave(&rx->lock, flags);
+	urbs = rx->urbs;
+	count = rx->urbs_count;
+	spin_unlock_irqrestore(&rx->lock, flags);
+
+	if (!urbs)
+		return;
+
+	for (i = 0; i < count; i++) {
+		usb_kill_urb(urbs[i]);
+		free_rx_urb(urbs[i]);
+	}
+	kfree(urbs);
+	rx->urbs = NULL;
+	rx->urbs_count = 0;
+}
+
+void plfxlc_usb_disable_rx(struct plfxlc_usb *usb)
+{
+	struct plfxlc_usb_rx *rx = &usb->rx;
+
+	mutex_lock(&rx->setup_mutex);
+	__lf_x_usb_disable_rx(usb);
+	usb->rx_usb_enabled = 0;
+	mutex_unlock(&rx->setup_mutex);
+}
+
+void plfxlc_usb_disable_tx(struct plfxlc_usb *usb)
+{
+	struct plfxlc_usb_tx *tx = &usb->tx;
+	unsigned long flags;
+
+	clear_bit(PLF_BIT_ENABLED, &tx->enabled);
+
+	/* kill all submitted tx-urbs */
+	usb_kill_anchored_urbs(&tx->submitted);
+
+	spin_lock_irqsave(&tx->lock, flags);
+	WARN_ON(!skb_queue_empty(&tx->submitted_skbs));
+	WARN_ON(tx->submitted_urbs != 0);
+	tx->submitted_urbs = 0;
+	spin_unlock_irqrestore(&tx->lock, flags);
+
+	/* The stopped state is ignored, relying on ieee80211_wake_queues()
+	 * in a potentionally following plfxlc_usb_enable_tx().
+	 */
+}
+
+void plfxlc_usb_enable_tx(struct plfxlc_usb *usb)
+{
+	struct plfxlc_usb_tx *tx = &usb->tx;
+	unsigned long flags;
+
+	spin_lock_irqsave(&tx->lock, flags);
+	set_bit(PLF_BIT_ENABLED, &tx->enabled);
+	tx->submitted_urbs = 0;
+	ieee80211_wake_queues(plfxlc_usb_to_hw(usb));
+	tx->stopped = 0;
+	spin_unlock_irqrestore(&tx->lock, flags);
+}
+
+void plfxlc_tx_urb_complete(struct urb *urb)
+{
+	struct ieee80211_tx_info *info;
+	struct plfxlc_usb *usb;
+	struct sk_buff *skb;
+
+	skb = urb->context;
+	info = IEEE80211_SKB_CB(skb);
+	/* grab 'usb' pointer before handing off the skb (since
+	 * it might be freed by plfxlc_mac_tx_to_dev or mac80211)
+	 */
+	usb = &plfxlc_hw_mac(info->rate_driver_data[0])->chip.usb;
+
+	switch (urb->status) {
+	case 0:
+		break;
+	case -ESHUTDOWN:
+	case -EINVAL:
+	case -ENODEV:
+	case -ENOENT:
+	case -ECONNRESET:
+	case -EPIPE:
+		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
+		break;
+	default:
+		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
+		return;
+	}
+
+	plfxlc_mac_tx_to_dev(skb, urb->status);
+	plfxlc_send_packet_from_data_queue(usb);
+	usb_free_urb(urb);
+}
+
+static inline void init_usb_rx(struct plfxlc_usb *usb)
+{
+	struct plfxlc_usb_rx *rx = &usb->rx;
+
+	spin_lock_init(&rx->lock);
+	mutex_init(&rx->setup_mutex);
+
+	if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH)
+		rx->usb_packet_size = 512;
+	else
+		rx->usb_packet_size = 64;
+
+	if (rx->fragment_length != 0)
+		dev_dbg(plfxlc_usb_dev(usb), "fragment_length error\n");
+}
+
+static inline void init_usb_tx(struct plfxlc_usb *usb)
+{
+	struct plfxlc_usb_tx *tx = &usb->tx;
+
+	spin_lock_init(&tx->lock);
+	clear_bit(PLF_BIT_ENABLED, &tx->enabled);
+	tx->stopped = 0;
+	skb_queue_head_init(&tx->submitted_skbs);
+	init_usb_anchor(&tx->submitted);
+}
+
+void plfxlc_usb_init(struct plfxlc_usb *usb, struct ieee80211_hw *hw,
+		     struct usb_interface *intf)
+{
+	memset(usb, 0, sizeof(*usb));
+	usb->intf = usb_get_intf(intf);
+	usb_set_intfdata(usb->intf, hw);
+	init_usb_tx(usb);
+	init_usb_rx(usb);
+}
+
+void plfxlc_usb_release(struct plfxlc_usb *usb)
+{
+	plfxlc_op_stop(plfxlc_usb_to_hw(usb));
+	plfxlc_usb_disable_tx(usb);
+	plfxlc_usb_disable_rx(usb);
+	usb_set_intfdata(usb->intf, NULL);
+	usb_put_intf(usb->intf);
+}
+
+const char *plfxlc_speed(enum usb_device_speed speed)
+{
+	switch (speed) {
+	case USB_SPEED_LOW:
+		return "low";
+	case USB_SPEED_FULL:
+		return "full";
+	case USB_SPEED_HIGH:
+		return "high";
+	default:
+		return "unknown";
+	}
+}
+
+int plfxlc_usb_init_hw(struct plfxlc_usb *usb)
+{
+	int r;
+
+	r = usb_reset_configuration(plfxlc_usb_to_usbdev(usb));
+	if (r) {
+		dev_err(plfxlc_usb_dev(usb), "cfg reset failed (%d)\n", r);
+		return r;
+	}
+	return 0;
+}
+
+static void get_usb_req(struct usb_device *udev, void *buffer,
+			u32 buffer_len, enum plf_usb_req_enum usb_req_id,
+			struct plf_usb_req *usb_req)
+{
+	__be32 payload_len_nw = cpu_to_be32(buffer_len + FCS_LEN);
+	const u8 *buffer_src_p = buffer;
+	u8 *buffer_dst = usb_req->buf;
+	u32 temp_usb_len = 0;
+
+	usb_req->id = cpu_to_be32(usb_req_id);
+	usb_req->len  = cpu_to_be32(0);
+
+	/* Copy buffer length into the transmitted buffer, as it is important
+	 * for the Rx MAC to know its exact length.
+	 */
+	if (usb_req->id == cpu_to_be32(USB_REQ_BEACON_WR)) {
+		memcpy(buffer_dst, &payload_len_nw, sizeof(payload_len_nw));
+		buffer_dst += sizeof(payload_len_nw);
+		temp_usb_len += sizeof(payload_len_nw);
+	}
+
+	memcpy(buffer_dst, buffer_src_p, buffer_len);
+	buffer_dst += buffer_len;
+	buffer_src_p += buffer_len;
+	temp_usb_len +=  buffer_len;
+
+	/* Set the FCS_LEN (4) bytes as 0 for CRC checking. */
+	memset(buffer_dst, 0, FCS_LEN);
+	buffer_dst += FCS_LEN;
+	temp_usb_len += FCS_LEN;
+
+	/* Round the packet to be transmitted to 4 bytes. */
+	if (temp_usb_len % PURELIFI_BYTE_NUM_ALIGNMENT) {
+		memset(buffer_dst, 0, PURELIFI_BYTE_NUM_ALIGNMENT -
+		       (temp_usb_len %
+			PURELIFI_BYTE_NUM_ALIGNMENT));
+		buffer_dst += PURELIFI_BYTE_NUM_ALIGNMENT -
+				(temp_usb_len %
+				PURELIFI_BYTE_NUM_ALIGNMENT);
+		temp_usb_len += PURELIFI_BYTE_NUM_ALIGNMENT -
+				(temp_usb_len % PURELIFI_BYTE_NUM_ALIGNMENT);
+	}
+
+	usb_req->len = cpu_to_be32(temp_usb_len);
+}
+
+int plfxlc_usb_wreq_async(struct plfxlc_usb *usb, const u8 *buffer,
+			  int buffer_len, enum plf_usb_req_enum usb_req_id,
+			  usb_complete_t complete_fn,
+			  void *context)
+{
+	struct usb_device *udev = interface_to_usbdev(usb->ez_usb);
+	struct urb *urb = usb_alloc_urb(0, GFP_ATOMIC);
+	int r;
+
+	usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
+			  (void *)buffer, buffer_len, complete_fn, context);
+
+	r = usb_submit_urb(urb, GFP_ATOMIC);
+	if (r)
+		dev_err(&udev->dev, "Async write submit failed (%d)\n", r);
+
+	return r;
+}
+
+int plfxlc_usb_wreq(struct usb_interface *ez_usb, void *buffer, int buffer_len,
+		    enum plf_usb_req_enum usb_req_id)
+{
+	struct usb_device *udev = interface_to_usbdev(ez_usb);
+	unsigned char *dma_buffer = NULL;
+	struct plf_usb_req usb_req;
+	int usb_bulk_msg_len;
+	int actual_length;
+	int r;
+
+	get_usb_req(udev, buffer, buffer_len, usb_req_id, &usb_req);
+	usb_bulk_msg_len = sizeof(__le32) + sizeof(__le32) +
+			   be32_to_cpu(usb_req.len);
+
+	dma_buffer = kmemdup(&usb_req, usb_bulk_msg_len, GFP_KERNEL);
+
+	if (!dma_buffer) {
+		r = -ENOMEM;
+		goto error;
+	}
+
+	r = usb_bulk_msg(udev,
+			 usb_sndbulkpipe(udev, EP_DATA_OUT),
+			 dma_buffer, usb_bulk_msg_len,
+			 &actual_length, USB_BULK_MSG_TIMEOUT_MS);
+	kfree(dma_buffer);
+error:
+	if (r) {
+		r = -ENOMEM;
+		dev_err(&udev->dev, "usb_bulk_msg failed (%d)\n", r);
+	}
+
+	return r;
+}
+
+static void slif_data_plane_sap_timer_callb(struct timer_list *t)
+{
+	struct plfxlc_usb *usb = from_timer(usb, t, tx.tx_retry_timer);
+
+	plfxlc_send_packet_from_data_queue(usb);
+	timer_setup(&usb->tx.tx_retry_timer,
+		    slif_data_plane_sap_timer_callb, 0);
+	mod_timer(&usb->tx.tx_retry_timer, jiffies + TX_RETRY_BACKOFF_JIFF);
+}
+
+static void sta_queue_cleanup_timer_callb(struct timer_list *t)
+{
+	struct plfxlc_usb *usb = from_timer(usb, t, sta_queue_cleanup);
+	struct plfxlc_usb_tx *tx = &usb->tx;
+	int sidx;
+
+	for (sidx = 0; sidx < MAX_STA_NUM - 1; sidx++) {
+		if (!(tx->station[sidx].flag & STATION_CONNECTED_FLAG))
+			continue;
+		if (tx->station[sidx].flag & STATION_HEARTBEAT_FLAG) {
+			tx->station[sidx].flag ^= STATION_HEARTBEAT_FLAG;
+		} else {
+			memset(tx->station[sidx].mac, 0, ETH_ALEN);
+			tx->station[sidx].flag = 0;
+		}
+	}
+	timer_setup(&usb->sta_queue_cleanup,
+		    sta_queue_cleanup_timer_callb, 0);
+	mod_timer(&usb->sta_queue_cleanup, jiffies + STA_QUEUE_CLEANUP_JIFF);
+}
+
+static int probe(struct usb_interface *intf,
+		 const struct usb_device_id *id)
+{
+	u8 serial_number[PURELIFI_SERIAL_LEN];
+	struct ieee80211_hw *hw = NULL;
+	struct plfxlc_usb_tx *tx;
+	struct plfxlc_chip *chip;
+	struct plfxlc_usb *usb;
+	u8 hw_address[ETH_ALEN];
+	unsigned int i;
+	int r = 0;
+
+	hw = plfxlc_mac_alloc_hw(intf);
+
+	if (!hw) {
+		r = -ENOMEM;
+		goto error;
+	}
+
+	chip = &plfxlc_hw_mac(hw)->chip;
+	usb = &chip->usb;
+	usb->ez_usb = intf;
+	tx = &usb->tx;
+
+	r = plfxlc_upload_mac_and_serial(intf, hw_address, serial_number);
+	if (r) {
+		dev_err(&intf->dev, "MAC and Serial upload failed (%d)\n", r);
+		goto error;
+	}
+
+	chip->unit_type = STA;
+	dev_err(&intf->dev, "Unit type is station");
+
+	r = plfxlc_mac_preinit_hw(hw, hw_address);
+	if (r) {
+		dev_err(&intf->dev, "Init mac failed (%d)\n", r);
+		goto error;
+	}
+
+	r = ieee80211_register_hw(hw);
+	if (r) {
+		dev_err(&intf->dev, "Register device failed (%d)\n", r);
+		goto error;
+	}
+
+	if ((le16_to_cpu(interface_to_usbdev(intf)->descriptor.idVendor) ==
+				PURELIFI_XL_VENDOR_ID_0) &&
+	    (le16_to_cpu(interface_to_usbdev(intf)->descriptor.idProduct) ==
+				PURELIFI_XL_PRODUCT_ID_0)) {
+		r = plfxlc_download_xl_firmware(intf);
+	} else {
+		r = plfxlc_download_fpga(intf);
+	}
+	if (r != 0) {
+		dev_err(&intf->dev, "FPGA download failed (%d)\n", r);
+		goto error;
+	}
+
+	tx->mac_fifo_full = 0;
+	spin_lock_init(&tx->lock);
+
+	msleep(PLF_MSLEEP_TIME);
+	r = plfxlc_usb_init_hw(usb);
+	if (r < 0) {
+		dev_err(&intf->dev, "usb_init_hw failed (%d)\n", r);
+		goto error;
+	}
+
+	msleep(PLF_MSLEEP_TIME);
+	r = plfxlc_chip_switch_radio(chip, PLFXLC_RADIO_ON);
+	if (r < 0) {
+		dev_dbg(&intf->dev, "chip_switch_radio_on failed (%d)\n", r);
+		goto error;
+	}
+
+	msleep(PLF_MSLEEP_TIME);
+	r = plfxlc_chip_set_rate(chip, 8);
+	if (r < 0) {
+		dev_dbg(&intf->dev, "chip_set_rate failed (%d)\n", r);
+		goto error;
+	}
+
+	msleep(PLF_MSLEEP_TIME);
+	r = plfxlc_usb_wreq(usb->ez_usb,
+			    hw_address, ETH_ALEN, USB_REQ_MAC_WR);
+	if (r < 0) {
+		dev_dbg(&intf->dev, "MAC_WR failure (%d)\n", r);
+		goto error;
+	}
+
+	plfxlc_chip_enable_rxtx(chip);
+
+	/* Initialise the data plane Tx queue */
+	for (i = 0; i < MAX_STA_NUM; i++) {
+		skb_queue_head_init(&tx->station[i].data_list);
+		tx->station[i].flag = 0;
+	}
+
+	tx->station[STA_BROADCAST_INDEX].flag |= STATION_CONNECTED_FLAG;
+	for (i = 0; i < ETH_ALEN; i++)
+		tx->station[STA_BROADCAST_INDEX].mac[i] = 0xFF;
+
+	timer_setup(&tx->tx_retry_timer, slif_data_plane_sap_timer_callb, 0);
+	tx->tx_retry_timer.expires = jiffies + TX_RETRY_BACKOFF_JIFF;
+	add_timer(&tx->tx_retry_timer);
+
+	timer_setup(&usb->sta_queue_cleanup,
+		    sta_queue_cleanup_timer_callb, 0);
+	usb->sta_queue_cleanup.expires = jiffies + STA_QUEUE_CLEANUP_JIFF;
+	add_timer(&usb->sta_queue_cleanup);
+
+	plfxlc_mac_init_hw(hw);
+	usb->initialized = true;
+	return 0;
+error:
+	if (hw) {
+		plfxlc_mac_release(plfxlc_hw_mac(hw));
+		ieee80211_unregister_hw(hw);
+		ieee80211_free_hw(hw);
+	}
+	dev_err(&intf->dev, "pureLifi:Device error");
+	return r;
+}
+
+static void disconnect(struct usb_interface *intf)
+{
+	struct ieee80211_hw *hw = plfxlc_intf_to_hw(intf);
+	struct plfxlc_mac *mac;
+	struct plfxlc_usb *usb;
+
+	/* Either something really bad happened, or
+	 * we're just dealing with a DEVICE_INSTALLER.
+	 */
+	if (!hw)
+		return;
+
+	mac = plfxlc_hw_mac(hw);
+	usb = &mac->chip.usb;
+
+	del_timer_sync(&usb->tx.tx_retry_timer);
+	del_timer_sync(&usb->sta_queue_cleanup);
+
+	ieee80211_unregister_hw(hw);
+
+	plfxlc_chip_disable_rxtx(&mac->chip);
+
+	/* If the disconnect has been caused by a removal of the
+	 * driver module, the reset allows reloading of the driver. If the
+	 * reset will not be executed here, the upload of the firmware in the
+	 * probe function caused by the reloading of the driver will fail.
+	 */
+	usb_reset_device(interface_to_usbdev(intf));
+
+	plfxlc_mac_release(mac);
+	ieee80211_free_hw(hw);
+}
+
+static void plfxlc_usb_resume(struct plfxlc_usb *usb)
+{
+	struct plfxlc_mac *mac = plfxlc_usb_to_mac(usb);
+	int r;
+
+	r = plfxlc_op_start(plfxlc_usb_to_hw(usb));
+	if (r < 0) {
+		dev_warn(plfxlc_usb_dev(usb),
+			 "Device resume failed (%d)\n", r);
+
+		if (usb->was_running)
+			set_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);
+
+		usb_queue_reset_device(usb->intf);
+		return;
+	}
+
+	if (mac->type != NL80211_IFTYPE_UNSPECIFIED) {
+		r = plfxlc_restore_settings(mac);
+		if (r < 0) {
+			dev_dbg(plfxlc_usb_dev(usb),
+				"Restore failed (%d)\n", r);
+			return;
+		}
+	}
+}
+
+static void plfxlc_usb_stop(struct plfxlc_usb *usb)
+{
+	plfxlc_op_stop(plfxlc_usb_to_hw(usb));
+	plfxlc_usb_disable_tx(usb);
+	plfxlc_usb_disable_rx(usb);
+
+	usb->initialized = false;
+}
+
+static int pre_reset(struct usb_interface *intf)
+{
+	struct ieee80211_hw *hw = usb_get_intfdata(intf);
+	struct plfxlc_mac *mac;
+	struct plfxlc_usb *usb;
+
+	if (!hw || intf->condition != USB_INTERFACE_BOUND)
+		return 0;
+
+	mac = plfxlc_hw_mac(hw);
+	usb = &mac->chip.usb;
+
+	usb->was_running = test_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);
+
+	plfxlc_usb_stop(usb);
+
+	return 0;
+}
+
+static int post_reset(struct usb_interface *intf)
+{
+	struct ieee80211_hw *hw = usb_get_intfdata(intf);
+	struct plfxlc_mac *mac;
+	struct plfxlc_usb *usb;
+
+	if (!hw || intf->condition != USB_INTERFACE_BOUND)
+		return 0;
+
+	mac = plfxlc_hw_mac(hw);
+	usb = &mac->chip.usb;
+
+	if (usb->was_running)
+		plfxlc_usb_resume(usb);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static struct plfxlc_usb *get_plfxlc_usb(struct usb_interface *intf)
+{
+	struct ieee80211_hw *hw = plfxlc_intf_to_hw(intf);
+	struct plfxlc_mac *mac;
+
+	/* Either something really bad happened, or
+	 * we're just dealing with a DEVICE_INSTALLER.
+	 */
+	if (!hw)
+		return NULL;
+
+	mac = plfxlc_hw_mac(hw);
+	return &mac->chip.usb;
+}
+
+static int suspend(struct usb_interface *interface,
+		   pm_message_t message)
+{
+	struct plfxlc_usb *pl = get_plfxlc_usb(interface);
+	struct plfxlc_mac *mac = plfxlc_usb_to_mac(pl);
+
+	if (!pl || !plfxlc_usb_dev(pl))
+		return -ENODEV;
+	if (pl->initialized == 0)
+		return 0;
+	pl->was_running = test_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);
+	plfxlc_usb_stop(pl);
+	return 0;
+}
+
+static int resume(struct usb_interface *interface)
+{
+	struct plfxlc_usb *pl = get_plfxlc_usb(interface);
+
+	if (!pl || !plfxlc_usb_dev(pl))
+		return -ENODEV;
+	if (pl->was_running)
+		plfxlc_usb_resume(pl);
+	return 0;
+}
+
+#endif
+
+static struct usb_driver driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = usb_ids,
+	.probe = probe,
+	.disconnect = disconnect,
+	.pre_reset = pre_reset,
+	.post_reset = post_reset,
+#ifdef CONFIG_PM
+	.suspend = suspend,
+	.resume = resume,
+#endif
+	.disable_hub_initiated_lpm = 1,
+};
+
+static int __init usb_init(void)
+{
+	int r;
+
+	r = usb_register(&driver);
+	if (r) {
+		pr_err("%s usb_register() failed %d\n", driver.name, r);
+		return r;
+	}
+
+	pr_debug("Driver initialized :%s\n", driver.name);
+	return 0;
+}
+
+static void __exit usb_exit(void)
+{
+	usb_deregister(&driver);
+	pr_debug("%s %s\n", driver.name, __func__);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("USB driver for pureLiFi devices");
+MODULE_AUTHOR("pureLiFi");
+MODULE_VERSION("1.0");
+MODULE_FIRMWARE("plfxlc/lifi-x.bin");
+MODULE_DEVICE_TABLE(usb, usb_ids);
+
+module_init(usb_init);
+module_exit(usb_exit);

drivers/net/wireless/purelifi/plfxlc/usb.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021 pureLiFi
+ */
+
+#ifndef PLFXLC_USB_H
+#define PLFXLC_USB_H
+
+#include <linux/completion.h>
+#include <linux/netdevice.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/usb.h>
+
+#include "intf.h"
+
+#define USB_BULK_MSG_TIMEOUT_MS 2000
+
+#define PURELIFI_X_VENDOR_ID_0   0x16C1
+#define PURELIFI_X_PRODUCT_ID_0  0x1CDE
+#define PURELIFI_XC_VENDOR_ID_0  0x2EF5
+#define PURELIFI_XC_PRODUCT_ID_0 0x0008
+#define PURELIFI_XL_VENDOR_ID_0  0x2EF5
+#define PURELIFI_XL_PRODUCT_ID_0 0x000A /* Station */
+
+#define PLF_FPGA_STATUS_LEN 2
+#define PLF_FPGA_STATE_LEN 9
+#define PLF_BULK_TLEN 16384
+#define PLF_FPGA_MG 6 /* Magic check */
+#define PLF_XL_BUF_LEN 64
+#define PLF_MSG_STATUS_OFFSET 7
+
+#define PLF_USB_TIMEOUT 1000
+#define PLF_MSLEEP_TIME 200
+
+#define PURELIFI_URB_RETRY_MAX 5
+
+#define plfxlc_usb_dev(usb) (&(usb)->intf->dev)
+
+/* Tx retry backoff timer (in milliseconds) */
+#define TX_RETRY_BACKOFF_MS 10
+#define STA_QUEUE_CLEANUP_MS 5000
+
+/* Tx retry backoff timer (in jiffies) */
+#define TX_RETRY_BACKOFF_JIFF ((TX_RETRY_BACKOFF_MS * HZ) / 1000)
+#define STA_QUEUE_CLEANUP_JIFF ((STA_QUEUE_CLEANUP_MS * HZ) / 1000)
+
+/* Ensures that MAX_TRANSFER_SIZE is even. */
+#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
+#define plfxlc_urb_dev(urb) (&(urb)->dev->dev)
+
+#define STATION_FIFO_ALMOST_FULL_MESSAGE     0
+#define STATION_FIFO_ALMOST_FULL_NOT_MESSAGE 1
+#define STATION_CONNECT_MESSAGE              2
+#define STATION_DISCONNECT_MESSAGE           3
+
+int plfxlc_usb_wreq(struct usb_interface *ez_usb, void *buffer, int buffer_len,
+		    enum plf_usb_req_enum usb_req_id);
+void plfxlc_tx_urb_complete(struct urb *urb);
+
+enum {
+	USB_MAX_RX_SIZE       = 4800,
+	USB_MAX_EP_INT_BUFFER = 64,
+};
+
+struct plfxlc_usb_interrupt {
+	spinlock_t lock; /* spin lock for usb interrupt buffer */
+	struct urb *urb;
+	void *buffer;
+	int interval;
+};
+
+#define RX_URBS_COUNT 5
+
+struct plfxlc_usb_rx {
+	spinlock_t lock; /* spin lock for rx urb */
+	struct mutex setup_mutex; /* mutex lockt for rx urb */
+	u8 fragment[2 * USB_MAX_RX_SIZE];
+	unsigned int fragment_length;
+	unsigned int usb_packet_size;
+	struct urb **urbs;
+	int urbs_count;
+};
+
+struct plf_station {
+   /*  7...3    |    2      |     1     |     0	    |
+    * Reserved  | Heartbeat | FIFO full | Connected |
+    */
+	unsigned char flag;
+	unsigned char mac[ETH_ALEN];
+	struct sk_buff_head data_list;
+};
+
+struct plfxlc_firmware_file {
+	u32 total_files;
+	u32 total_size;
+	u32 size;
+	u32 start_addr;
+	u32 control_packets;
+} __packed;
+
+#define STATION_CONNECTED_FLAG 0x1
+#define STATION_FIFO_FULL_FLAG 0x2
+#define STATION_HEARTBEAT_FLAG 0x4
+#define STATION_ACTIVE_FLAG    0xFD
+
+#define PURELIFI_SERIAL_LEN 256
+#define STA_BROADCAST_INDEX (AP_USER_LIMIT)
+#define MAX_STA_NUM         (AP_USER_LIMIT + 1)
+
+struct plfxlc_usb_tx {
+	unsigned long enabled;
+	spinlock_t lock; /* spinlock for USB tx */
+	u8 mac_fifo_full;
+	struct sk_buff_head submitted_skbs;
+	struct usb_anchor submitted;
+	int submitted_urbs;
+	bool stopped;
+	struct timer_list tx_retry_timer;
+	struct plf_station station[MAX_STA_NUM];
+};
+
+/* Contains the usb parts. The structure doesn't require a lock because intf
+ * will not be changed after initialization.
+ */
+struct plfxlc_usb {
+	struct timer_list sta_queue_cleanup;
+	struct plfxlc_usb_rx rx;
+	struct plfxlc_usb_tx tx;
+	struct usb_interface *intf;
+	struct usb_interface *ez_usb;
+	u8 req_buf[64]; /* plfxlc_usb_iowrite16v needs 62 bytes */
+	u8 sidx; /* store last served */
+	bool rx_usb_enabled;
+	bool initialized;
+	bool was_running;
+	bool link_up;
+};
+
+enum endpoints {
+	EP_DATA_IN  = 2,
+	EP_DATA_OUT = 8,
+};
+
+enum devicetype {
+	DEVICE_LIFI_X  = 0,
+	DEVICE_LIFI_XC  = 1,
+	DEVICE_LIFI_XL  = 1,
+};
+
+enum {
+	PLF_BIT_ENABLED = 1,
+	PLF_BIT_MAX = 2,
+};
+
+int plfxlc_usb_wreq_async(struct plfxlc_usb *usb, const u8 *buffer,
+			  int buffer_len, enum plf_usb_req_enum usb_req_id,
+			  usb_complete_t complete_fn, void *context);
+
+static inline struct usb_device *
+plfxlc_usb_to_usbdev(struct plfxlc_usb *usb)
+{
+	return interface_to_usbdev(usb->intf);
+}
+
+static inline struct ieee80211_hw *
+plfxlc_intf_to_hw(struct usb_interface *intf)
+{
+	return usb_get_intfdata(intf);
+}
+
+static inline struct ieee80211_hw *
+plfxlc_usb_to_hw(struct plfxlc_usb *usb)
+{
+	return plfxlc_intf_to_hw(usb->intf);
+}
+
+void plfxlc_usb_init(struct plfxlc_usb *usb, struct ieee80211_hw *hw,
+		     struct usb_interface *intf);
+void plfxlc_send_packet_from_data_queue(struct plfxlc_usb *usb);
+void plfxlc_usb_release(struct plfxlc_usb *usb);
+void plfxlc_usb_disable_rx(struct plfxlc_usb *usb);
+void plfxlc_usb_enable_tx(struct plfxlc_usb *usb);
+void plfxlc_usb_disable_tx(struct plfxlc_usb *usb);
+int plfxlc_usb_tx(struct plfxlc_usb *usb, struct sk_buff *skb);
+int plfxlc_usb_enable_rx(struct plfxlc_usb *usb);
+int plfxlc_usb_init_hw(struct plfxlc_usb *usb);
+const char *plfxlc_speed(enum usb_device_speed speed);
+
+/* Firmware declarations */
+int plfxlc_download_xl_firmware(struct usb_interface *intf);
+int plfxlc_download_fpga(struct usb_interface *intf);
+
+int plfxlc_upload_mac_and_serial(struct usb_interface *intf,
+				 unsigned char *hw_address,
+				 unsigned char *serial_number);
+
+#endif /* PLFXLC_USB_H */