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

@@ -0,0 +1,17 @@
+# 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

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_PLFXLC)		:= plfxlc/

drivers/net/wireless/purelifi/plfxlc/Kconfig

@@ -0,0 +1,14 @@
+# 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

@@ -0,0 +1,3 @@
+# 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

@@ -0,0 +1,99 @@
+// 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

@@ -0,0 +1,70 @@
+/* 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 */