Won Kang from gct contributed the driver in 2013.

The following reasons lead to the removal:
- This driver generates maintenance workload
- The manufacturer is not interested and does not care as Emails or
  inquiries, to support or involved persons of gct, got unanswered.
- Did not find a possibility to buy the chips.
- Did not find minimal documentation on the web.
- Did not find a device where it is build in and the user is able to
  install any Linux. Therefore it is not possible to do any testing of
  the driver from the community.
- No blog entries about anyone using the gdmtty and gdmulte.
- No response about usage of this drivers to the Email from April 2024

Link: https://lore.kernel.org/linux-staging/2024100910-smoky-condiment-2298@gregkh/T/#u
Link: https://lore.kernel.org/all/78b521eb-4e89-4c01-8dfc-1fb990e6887d@gmail.com/
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
---
Checked for artifacts of gdm724x in MAINTAINERS.
Removed artifacts in Makefile and Kconfig.
---
 drivers/staging/Kconfig              |    2 -
 drivers/staging/Makefile             |    1 -
 drivers/staging/gdm724x/Kconfig      |   16 -
 drivers/staging/gdm724x/Makefile     |    8 -
 drivers/staging/gdm724x/TODO         |   15 -
 drivers/staging/gdm724x/gdm_endian.c |   37 -
 drivers/staging/gdm724x/gdm_endian.h |   30 -
 drivers/staging/gdm724x/gdm_lte.c    |  937 ------------------------
 drivers/staging/gdm724x/gdm_lte.h    |   71 --
 drivers/staging/gdm724x/gdm_mux.c    |  668 -----------------
 drivers/staging/gdm724x/gdm_mux.h    |   85 ---
 drivers/staging/gdm724x/gdm_tty.c    |  316 --------
 drivers/staging/gdm724x/gdm_tty.h    |   60 --
 drivers/staging/gdm724x/gdm_usb.c    | 1014 --------------------------
 drivers/staging/gdm724x/gdm_usb.h    |   99 ---
 drivers/staging/gdm724x/hci.h        |   45 --
 drivers/staging/gdm724x/hci_packet.h |   82 ---
 drivers/staging/gdm724x/netlink_k.c  |  128 ----
 drivers/staging/gdm724x/netlink_k.h  |   16 -
 19 files changed, 3630 deletions(-)
 delete mode 100644 drivers/staging/gdm724x/Kconfig
 delete mode 100644 drivers/staging/gdm724x/Makefile
 delete mode 100644 drivers/staging/gdm724x/TODO
 delete mode 100644 drivers/staging/gdm724x/gdm_endian.c
 delete mode 100644 drivers/staging/gdm724x/gdm_endian.h
 delete mode 100644 drivers/staging/gdm724x/gdm_lte.c
 delete mode 100644 drivers/staging/gdm724x/gdm_lte.h
 delete mode 100644 drivers/staging/gdm724x/gdm_mux.c
 delete mode 100644 drivers/staging/gdm724x/gdm_mux.h
 delete mode 100644 drivers/staging/gdm724x/gdm_tty.c
 delete mode 100644 drivers/staging/gdm724x/gdm_tty.h
 delete mode 100644 drivers/staging/gdm724x/gdm_usb.c
 delete mode 100644 drivers/staging/gdm724x/gdm_usb.h
 delete mode 100644 drivers/staging/gdm724x/hci.h
 delete mode 100644 drivers/staging/gdm724x/hci_packet.h
 delete mode 100644 drivers/staging/gdm724x/netlink_k.c
 delete mode 100644 drivers/staging/gdm724x/netlink_k.h

diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 5fbb0bc53308..2493e150fbbd 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -42,8 +42,6 @@ source "drivers/staging/nvec/Kconfig"
 
 source "drivers/staging/media/Kconfig"
 
-source "drivers/staging/gdm724x/Kconfig"
-
 source "drivers/staging/fbtft/Kconfig"
 
 source "drivers/staging/most/Kconfig"
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 797dcd192a33..add5e887e451 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -11,7 +11,6 @@ obj-$(CONFIG_VME_BUS)		+= vme_user/
 obj-$(CONFIG_IIO)		+= iio/
 obj-$(CONFIG_FB_SM750)		+= sm750fb/
 obj-$(CONFIG_MFD_NVEC)		+= nvec/
-obj-$(CONFIG_LTE_GDM724X)	+= gdm724x/
 obj-$(CONFIG_FB_TFT)		+= fbtft/
 obj-$(CONFIG_MOST)		+= most/
 obj-$(CONFIG_GREYBUS)		+= greybus/
diff --git a/drivers/staging/gdm724x/Kconfig b/drivers/staging/gdm724x/Kconfig
deleted file mode 100644
index 1f403ecd9608..000000000000
--- a/drivers/staging/gdm724x/Kconfig
+++ /dev/null
@@ -1,16 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# GCT GDM724x LTE driver configuration
-#
-
-config LTE_GDM724X
-	tristate "GCT GDM724x LTE support"
-	depends on NET && USB && TTY && m
-	help
-	  This driver supports GCT GDM724x LTE chip based USB modem devices.
-	  It exposes 4 network devices to be used per PDN and 2 tty devices to be
-	  used for AT commands and DM monitoring applications.
-	  The modules will be called gdmulte.ko and gdmtty.ko
-
-	  GCT-ATCx can be used for AT Commands
-	  GCT-DMx can be used for LTE protocol monitoring
diff --git a/drivers/staging/gdm724x/Makefile b/drivers/staging/gdm724x/Makefile
deleted file mode 100644
index e61b95788c9f..000000000000
--- a/drivers/staging/gdm724x/Makefile
+++ /dev/null
@@ -1,8 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_LTE_GDM724X) := gdmulte.o
-gdmulte-y += gdm_lte.o netlink_k.o
-gdmulte-y += gdm_usb.o gdm_endian.o
-
-obj-$(CONFIG_LTE_GDM724X) += gdmtty.o
-gdmtty-y := gdm_tty.o gdm_mux.o
-
diff --git a/drivers/staging/gdm724x/TODO b/drivers/staging/gdm724x/TODO
deleted file mode 100644
index 56a415b9dcbe..000000000000
--- a/drivers/staging/gdm724x/TODO
+++ /dev/null
@@ -1,15 +0,0 @@
-TODO:
-- Clean up coding style to meet kernel standard. (80 line limit, netdev_err)
-- Remove test for host endian
-- Remove confusing macros (endian, hci_send, sdu_send, rcv_with_cb)
-- Check for skb->len in gdm_lte_emulate_arp()
-- Use ALIGN() macro for dummy_cnt in up_to_host()
-- Error handling in init_usb()
-- Explain reason for multiples of 512 bytes in alloc_tx_struct()
-- Review use of atomic allocation for tx structs
-- No error checking for alloc_tx_struct in do_tx()
-- fix up static tty port allocation to be dynamic
-
-Patches to:
-	Jonathan Kim <jonathankim@gctsemi.com>
-	Dean ahn <deanahn@gctsemi.com>
diff --git a/drivers/staging/gdm724x/gdm_endian.c b/drivers/staging/gdm724x/gdm_endian.c
deleted file mode 100644
index ae39e59daf70..000000000000
--- a/drivers/staging/gdm724x/gdm_endian.c
+++ /dev/null
@@ -1,37 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#include <linux/kernel.h>
-#include "gdm_endian.h"
-
-__dev16 gdm_cpu_to_dev16(u8 dev_ed, u16 x)
-{
-	if (dev_ed == ENDIANNESS_LITTLE)
-		return (__force __dev16)cpu_to_le16(x);
-	else
-		return (__force __dev16)cpu_to_be16(x);
-}
-
-u16 gdm_dev16_to_cpu(u8 dev_ed, __dev16 x)
-{
-	if (dev_ed == ENDIANNESS_LITTLE)
-		return le16_to_cpu((__force __le16)x);
-	else
-		return be16_to_cpu((__force __be16)x);
-}
-
-__dev32 gdm_cpu_to_dev32(u8 dev_ed, u32 x)
-{
-	if (dev_ed == ENDIANNESS_LITTLE)
-		return (__force __dev32)cpu_to_le32(x);
-	else
-		return (__force __dev32)cpu_to_be32(x);
-}
-
-u32 gdm_dev32_to_cpu(u8 dev_ed, __dev32 x)
-{
-	if (dev_ed == ENDIANNESS_LITTLE)
-		return le32_to_cpu((__force __le32)x);
-	else
-		return be32_to_cpu((__force __be32)x);
-}
diff --git a/drivers/staging/gdm724x/gdm_endian.h b/drivers/staging/gdm724x/gdm_endian.h
deleted file mode 100644
index f373dc3a19bf..000000000000
--- a/drivers/staging/gdm724x/gdm_endian.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#ifndef __GDM_ENDIAN_H__
-#define __GDM_ENDIAN_H__
-
-#include <linux/types.h>
-
-/*
- * For data in "device-endian" byte order (device endianness is model
- * dependent).  Analogous to __leXX or __beXX.
- */
-typedef __u32 __bitwise __dev32;
-typedef __u16 __bitwise __dev16;
-
-enum {
-	ENDIANNESS_MIN = 0,
-	ENDIANNESS_UNKNOWN,
-	ENDIANNESS_LITTLE,
-	ENDIANNESS_BIG,
-	ENDIANNESS_MIDDLE,
-	ENDIANNESS_MAX
-};
-
-__dev16 gdm_cpu_to_dev16(u8 dev_ed, u16 x);
-u16 gdm_dev16_to_cpu(u8 dev_ed, __dev16 x);
-__dev32 gdm_cpu_to_dev32(u8 dev_ed, u32 x);
-u32 gdm_dev32_to_cpu(u8 dev_ed, __dev32 x);
-
-#endif /*__GDM_ENDIAN_H__*/
diff --git a/drivers/staging/gdm724x/gdm_lte.c b/drivers/staging/gdm724x/gdm_lte.c
deleted file mode 100644
index eb754b231429..000000000000
--- a/drivers/staging/gdm724x/gdm_lte.c
+++ /dev/null
@@ -1,937 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/etherdevice.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <linux/udp.h>
-#include <linux/in.h>
-#include <linux/if_arp.h>
-#include <linux/if_ether.h>
-#include <linux/if_vlan.h>
-#include <linux/in6.h>
-#include <linux/tcp.h>
-#include <linux/icmp.h>
-#include <linux/icmpv6.h>
-#include <linux/uaccess.h>
-#include <linux/errno.h>
-#include <net/ndisc.h>
-
-#include "gdm_lte.h"
-#include "netlink_k.h"
-#include "hci.h"
-#include "hci_packet.h"
-#include "gdm_endian.h"
-
-/*
- * Netlink protocol number
- */
-#define NETLINK_LTE 30
-
-/*
- * Default MTU Size
- */
-#define DEFAULT_MTU_SIZE 1500
-
-#define IP_VERSION_4	4
-#define IP_VERSION_6	6
-
-static struct {
-	int ref_cnt;
-	struct sock *sock;
-} lte_event;
-
-static const struct device_type wwan_type = {
-	.name   = "wwan",
-};
-
-static int gdm_lte_open(struct net_device *dev)
-{
-	netif_start_queue(dev);
-	return 0;
-}
-
-static int gdm_lte_close(struct net_device *dev)
-{
-	netif_stop_queue(dev);
-	return 0;
-}
-
-static int gdm_lte_set_config(struct net_device *dev, struct ifmap *map)
-{
-	if (dev->flags & IFF_UP)
-		return -EBUSY;
-	return 0;
-}
-
-static void tx_complete(void *arg)
-{
-	struct nic *nic = arg;
-
-	if (netif_queue_stopped(nic->netdev))
-		netif_wake_queue(nic->netdev);
-}
-
-static int gdm_lte_rx(struct sk_buff *skb, struct nic *nic, int nic_type)
-{
-	int ret, len;
-
-	len = skb->len + ETH_HLEN;
-	ret = netif_rx(skb);
-	if (ret == NET_RX_DROP) {
-		nic->stats.rx_dropped++;
-	} else {
-		nic->stats.rx_packets++;
-		nic->stats.rx_bytes += len;
-	}
-
-	return 0;
-}
-
-static int gdm_lte_emulate_arp(struct sk_buff *skb_in, u32 nic_type)
-{
-	struct nic *nic = netdev_priv(skb_in->dev);
-	struct sk_buff *skb_out;
-	struct ethhdr eth;
-	struct vlan_ethhdr vlan_eth;
-	struct arphdr *arp_in;
-	struct arphdr *arp_out;
-	struct arpdata {
-		u8 ar_sha[ETH_ALEN];
-		u8 ar_sip[4];
-		u8 ar_tha[ETH_ALEN];
-		u8 ar_tip[4];
-	};
-	struct arpdata *arp_data_in;
-	struct arpdata *arp_data_out;
-	u8 arp_temp[60];
-	void *mac_header_data;
-	u32 mac_header_len;
-
-	/* Check for skb->len, discard if empty */
-	if (skb_in->len == 0)
-		return -ENODATA;
-
-	/* Format the mac header so that it can be put to skb */
-	if (ntohs(((struct ethhdr *)skb_in->data)->h_proto) == ETH_P_8021Q) {
-		memcpy(&vlan_eth, skb_in->data, sizeof(struct vlan_ethhdr));
-		mac_header_data = &vlan_eth;
-		mac_header_len = VLAN_ETH_HLEN;
-	} else {
-		memcpy(&eth, skb_in->data, sizeof(struct ethhdr));
-		mac_header_data = &eth;
-		mac_header_len = ETH_HLEN;
-	}
-
-	/* Get the pointer of the original request */
-	arp_in = (struct arphdr *)(skb_in->data + mac_header_len);
-	arp_data_in = (struct arpdata *)(skb_in->data + mac_header_len +
-					sizeof(struct arphdr));
-
-	/* Get the pointer of the outgoing response */
-	arp_out = (struct arphdr *)arp_temp;
-	arp_data_out = (struct arpdata *)(arp_temp + sizeof(struct arphdr));
-
-	/* Copy the arp header */
-	memcpy(arp_out, arp_in, sizeof(struct arphdr));
-	arp_out->ar_op = htons(ARPOP_REPLY);
-
-	/* Copy the arp payload: based on 2 bytes of mac and fill the IP */
-	arp_data_out->ar_sha[0] = arp_data_in->ar_sha[0];
-	arp_data_out->ar_sha[1] = arp_data_in->ar_sha[1];
-	memcpy(&arp_data_out->ar_sha[2], &arp_data_in->ar_tip[0], 4);
-	memcpy(&arp_data_out->ar_sip[0], &arp_data_in->ar_tip[0], 4);
-	memcpy(&arp_data_out->ar_tha[0], &arp_data_in->ar_sha[0], 6);
-	memcpy(&arp_data_out->ar_tip[0], &arp_data_in->ar_sip[0], 4);
-
-	/* Fill the destination mac with source mac of the received packet */
-	memcpy(mac_header_data, mac_header_data + ETH_ALEN, ETH_ALEN);
-	/* Fill the source mac with nic's source mac */
-	memcpy(mac_header_data + ETH_ALEN, nic->src_mac_addr, ETH_ALEN);
-
-	/* Alloc skb and reserve align */
-	skb_out = dev_alloc_skb(skb_in->len);
-	if (!skb_out)
-		return -ENOMEM;
-	skb_reserve(skb_out, NET_IP_ALIGN);
-
-	skb_put_data(skb_out, mac_header_data, mac_header_len);
-	skb_put_data(skb_out, arp_out, sizeof(struct arphdr));
-	skb_put_data(skb_out, arp_data_out, sizeof(struct arpdata));
-
-	skb_out->protocol = ((struct ethhdr *)mac_header_data)->h_proto;
-	skb_out->dev = skb_in->dev;
-	skb_reset_mac_header(skb_out);
-	skb_pull(skb_out, ETH_HLEN);
-
-	gdm_lte_rx(skb_out, nic, nic_type);
-
-	return 0;
-}
-
-static __sum16 icmp6_checksum(struct ipv6hdr *ipv6, u16 *ptr, int len)
-{
-	unsigned short *w;
-	__wsum sum = 0;
-	int i;
-	u16 pa;
-
-	union {
-		struct {
-			u8 ph_src[16];
-			u8 ph_dst[16];
-			u32 ph_len;
-			u8 ph_zero[3];
-			u8 ph_nxt;
-		} ph __packed;
-		u16 pa[20];
-	} pseudo_header;
-
-	memset(&pseudo_header, 0, sizeof(pseudo_header));
-	memcpy(&pseudo_header.ph.ph_src, &ipv6->saddr.in6_u.u6_addr8, 16);
-	memcpy(&pseudo_header.ph.ph_dst, &ipv6->daddr.in6_u.u6_addr8, 16);
-	pseudo_header.ph.ph_len = be16_to_cpu(ipv6->payload_len);
-	pseudo_header.ph.ph_nxt = ipv6->nexthdr;
-
-	for (i = 0; i < ARRAY_SIZE(pseudo_header.pa); i++) {
-		pa = pseudo_header.pa[i];
-		sum = csum_add(sum, csum_unfold((__force __sum16)pa));
-	}
-
-	w = ptr;
-	while (len > 1) {
-		sum = csum_add(sum, csum_unfold((__force __sum16)*w++));
-		len -= 2;
-	}
-
-	return csum_fold(sum);
-}
-
-static int gdm_lte_emulate_ndp(struct sk_buff *skb_in, u32 nic_type)
-{
-	struct nic *nic = netdev_priv(skb_in->dev);
-	struct sk_buff *skb_out;
-	struct ethhdr eth;
-	struct vlan_ethhdr vlan_eth;
-	struct neighbour_advertisement {
-		u8 target_address[16];
-		u8 type;
-		u8 length;
-		u8 link_layer_address[6];
-	};
-	struct neighbour_advertisement na;
-	struct neighbour_solicitation {
-		u8 target_address[16];
-	};
-	struct neighbour_solicitation *ns;
-	struct ipv6hdr *ipv6_in;
-	struct ipv6hdr ipv6_out;
-	struct icmp6hdr *icmp6_in;
-	struct icmp6hdr icmp6_out;
-
-	void *mac_header_data;
-	u32 mac_header_len;
-
-	/* Format the mac header so that it can be put to skb */
-	if (ntohs(((struct ethhdr *)skb_in->data)->h_proto) == ETH_P_8021Q) {
-		memcpy(&vlan_eth, skb_in->data, sizeof(struct vlan_ethhdr));
-		if (ntohs(vlan_eth.h_vlan_encapsulated_proto) != ETH_P_IPV6)
-			return -EPROTONOSUPPORT;
-		mac_header_data = &vlan_eth;
-		mac_header_len = VLAN_ETH_HLEN;
-	} else {
-		memcpy(&eth, skb_in->data, sizeof(struct ethhdr));
-		if (ntohs(eth.h_proto) != ETH_P_IPV6)
-			return -EPROTONOSUPPORT;
-		mac_header_data = &eth;
-		mac_header_len = ETH_HLEN;
-	}
-
-	/* Check if this is IPv6 ICMP packet */
-	ipv6_in = (struct ipv6hdr *)(skb_in->data + mac_header_len);
-	if (ipv6_in->version != 6 || ipv6_in->nexthdr != IPPROTO_ICMPV6)
-		return -EPROTONOSUPPORT;
-
-	/* Check if this is NDP packet */
-	icmp6_in = (struct icmp6hdr *)(skb_in->data + mac_header_len +
-					sizeof(struct ipv6hdr));
-	if (icmp6_in->icmp6_type == NDISC_ROUTER_SOLICITATION) { /* Check RS */
-		return -EPROTONOSUPPORT;
-	} else if (icmp6_in->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
-		/* Check NS */
-		u8 icmp_na[sizeof(struct icmp6hdr) +
-			sizeof(struct neighbour_advertisement)];
-		u8 zero_addr8[16] = {0,};
-
-		if (memcmp(ipv6_in->saddr.in6_u.u6_addr8, zero_addr8, 16) == 0)
-			/* Duplicate Address Detection: Source IP is all zero */
-			return 0;
-
-		icmp6_out.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
-		icmp6_out.icmp6_code = 0;
-		icmp6_out.icmp6_cksum = 0;
-		/* R=0, S=1, O=1 */
-		icmp6_out.icmp6_dataun.un_data32[0] = htonl(0x60000000);
-
-		ns = (struct neighbour_solicitation *)
-			(skb_in->data + mac_header_len +
-			 sizeof(struct ipv6hdr) + sizeof(struct icmp6hdr));
-		memcpy(&na.target_address, ns->target_address, 16);
-		na.type = 0x02;
-		na.length = 1;
-		na.link_layer_address[0] = 0x00;
-		na.link_layer_address[1] = 0x0a;
-		na.link_layer_address[2] = 0x3b;
-		na.link_layer_address[3] = 0xaf;
-		na.link_layer_address[4] = 0x63;
-		na.link_layer_address[5] = 0xc7;
-
-		memcpy(&ipv6_out, ipv6_in, sizeof(struct ipv6hdr));
-		memcpy(ipv6_out.saddr.in6_u.u6_addr8, &na.target_address, 16);
-		memcpy(ipv6_out.daddr.in6_u.u6_addr8,
-		       ipv6_in->saddr.in6_u.u6_addr8, 16);
-		ipv6_out.payload_len = htons(sizeof(struct icmp6hdr) +
-				sizeof(struct neighbour_advertisement));
-
-		memcpy(icmp_na, &icmp6_out, sizeof(struct icmp6hdr));
-		memcpy(icmp_na + sizeof(struct icmp6hdr), &na,
-		       sizeof(struct neighbour_advertisement));
-
-		icmp6_out.icmp6_cksum = icmp6_checksum(&ipv6_out,
-						       (u16 *)icmp_na,
-						       sizeof(icmp_na));
-	} else {
-		return -EINVAL;
-	}
-
-	/* Fill the destination mac with source mac of the received packet */
-	memcpy(mac_header_data, mac_header_data + ETH_ALEN, ETH_ALEN);
-	/* Fill the source mac with nic's source mac */
-	memcpy(mac_header_data + ETH_ALEN, nic->src_mac_addr, ETH_ALEN);
-
-	/* Alloc skb and reserve align */
-	skb_out = dev_alloc_skb(skb_in->len);
-	if (!skb_out)
-		return -ENOMEM;
-	skb_reserve(skb_out, NET_IP_ALIGN);
-
-	skb_put_data(skb_out, mac_header_data, mac_header_len);
-	skb_put_data(skb_out, &ipv6_out, sizeof(struct ipv6hdr));
-	skb_put_data(skb_out, &icmp6_out, sizeof(struct icmp6hdr));
-	skb_put_data(skb_out, &na, sizeof(struct neighbour_advertisement));
-
-	skb_out->protocol = ((struct ethhdr *)mac_header_data)->h_proto;
-	skb_out->dev = skb_in->dev;
-	skb_reset_mac_header(skb_out);
-	skb_pull(skb_out, ETH_HLEN);
-
-	gdm_lte_rx(skb_out, nic, nic_type);
-
-	return 0;
-}
-
-static s32 gdm_lte_tx_nic_type(struct net_device *dev, struct sk_buff *skb)
-{
-	struct nic *nic = netdev_priv(dev);
-	struct ethhdr *eth;
-	struct vlan_ethhdr *vlan_eth;
-	struct iphdr *ip;
-	struct ipv6hdr *ipv6;
-	int mac_proto;
-	void *network_data;
-	u32 nic_type;
-
-	/* NIC TYPE is based on the nic_id of this net_device */
-	nic_type = 0x00000010 | nic->nic_id;
-
-	/* Get ethernet protocol */
-	eth = (struct ethhdr *)skb->data;
-	if (ntohs(eth->h_proto) == ETH_P_8021Q) {
-		vlan_eth = skb_vlan_eth_hdr(skb);
-		mac_proto = ntohs(vlan_eth->h_vlan_encapsulated_proto);
-		network_data = skb->data + VLAN_ETH_HLEN;
-		nic_type |= NIC_TYPE_F_VLAN;
-	} else {
-		mac_proto = ntohs(eth->h_proto);
-		network_data = skb->data + ETH_HLEN;
-	}
-
-	/* Process packet for nic type */
-	switch (mac_proto) {
-	case ETH_P_ARP:
-		nic_type |= NIC_TYPE_ARP;
-		break;
-	case ETH_P_IP:
-		nic_type |= NIC_TYPE_F_IPV4;
-		ip = network_data;
-
-		/* Check DHCPv4 */
-		if (ip->protocol == IPPROTO_UDP) {
-			struct udphdr *udp =
-					network_data + sizeof(struct iphdr);
-			if (ntohs(udp->dest) == 67 || ntohs(udp->dest) == 68)
-				nic_type |= NIC_TYPE_F_DHCP;
-		}
-		break;
-	case ETH_P_IPV6:
-		nic_type |= NIC_TYPE_F_IPV6;
-		ipv6 = network_data;
-
-		if (ipv6->nexthdr == IPPROTO_ICMPV6) /* Check NDP request */ {
-			struct icmp6hdr *icmp6 =
-					network_data + sizeof(struct ipv6hdr);
-			if (icmp6->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
-				nic_type |= NIC_TYPE_ICMPV6;
-		} else if (ipv6->nexthdr == IPPROTO_UDP) /* Check DHCPv6 */ {
-			struct udphdr *udp =
-					network_data + sizeof(struct ipv6hdr);
-			if (ntohs(udp->dest) == 546 || ntohs(udp->dest) == 547)
-				nic_type |= NIC_TYPE_F_DHCP;
-		}
-		break;
-	default:
-		break;
-	}
-
-	return nic_type;
-}
-
-static netdev_tx_t gdm_lte_tx(struct sk_buff *skb, struct net_device *dev)
-{
-	struct nic *nic = netdev_priv(dev);
-	u32 nic_type;
-	void *data_buf;
-	int data_len;
-	int idx;
-	int ret = 0;
-
-	nic_type = gdm_lte_tx_nic_type(dev, skb);
-	if (nic_type == 0) {
-		netdev_err(dev, "tx - invalid nic_type\n");
-		return -EMEDIUMTYPE;
-	}
-
-	if (nic_type & NIC_TYPE_ARP) {
-		if (gdm_lte_emulate_arp(skb, nic_type) == 0) {
-			dev_kfree_skb(skb);
-			return 0;
-		}
-	}
-
-	if (nic_type & NIC_TYPE_ICMPV6) {
-		if (gdm_lte_emulate_ndp(skb, nic_type) == 0) {
-			dev_kfree_skb(skb);
-			return 0;
-		}
-	}
-
-	/*
-	 * Need byte shift (that is, remove VLAN tag) if there is one
-	 * For the case of ARP, this breaks the offset as vlan_ethhdr+4
-	 * is treated as ethhdr	However, it shouldn't be a problem as
-	 * the response starts from arp_hdr and ethhdr is created by this
-	 * driver based on the NIC mac
-	 */
-	if (nic_type & NIC_TYPE_F_VLAN) {
-		struct vlan_ethhdr *vlan_eth = skb_vlan_eth_hdr(skb);
-
-		nic->vlan_id = ntohs(vlan_eth->h_vlan_TCI) & VLAN_VID_MASK;
-		data_buf = skb->data + (VLAN_ETH_HLEN - ETH_HLEN);
-		data_len = skb->len - (VLAN_ETH_HLEN - ETH_HLEN);
-	} else {
-		nic->vlan_id = 0;
-		data_buf = skb->data;
-		data_len = skb->len;
-	}
-
-	/* If it is a ICMPV6 packet, clear all the other bits :
-	 * for backward compatibility with the firmware
-	 */
-	if (nic_type & NIC_TYPE_ICMPV6)
-		nic_type = NIC_TYPE_ICMPV6;
-
-	/* If it is not a dhcp packet, clear all the flag bits :
-	 * original NIC, otherwise the special flag (IPVX | DHCP)
-	 */
-	if (!(nic_type & NIC_TYPE_F_DHCP))
-		nic_type &= NIC_TYPE_MASK;
-
-	ret = sscanf(dev->name, "lte%d", &idx);
-	if (ret != 1) {
-		dev_kfree_skb(skb);
-		return -EINVAL;
-	}
-
-	ret = nic->phy_dev->send_sdu_func(nic->phy_dev->priv_dev,
-					  data_buf, data_len,
-					  nic->pdn_table.dft_eps_id, 0,
-					  tx_complete, nic, idx,
-					  nic_type);
-
-	if (ret == TX_NO_BUFFER || ret == TX_NO_SPC) {
-		netif_stop_queue(dev);
-		if (ret == TX_NO_BUFFER)
-			ret = 0;
-		else
-			ret = -ENOSPC;
-	} else if (ret == TX_NO_DEV) {
-		ret = -ENODEV;
-	}
-
-	/* Updates tx stats */
-	if (ret) {
-		nic->stats.tx_dropped++;
-	} else {
-		nic->stats.tx_packets++;
-		nic->stats.tx_bytes += data_len;
-	}
-	dev_kfree_skb(skb);
-
-	return 0;
-}
-
-static struct net_device_stats *gdm_lte_stats(struct net_device *dev)
-{
-	struct nic *nic = netdev_priv(dev);
-
-	return &nic->stats;
-}
-
-static int gdm_lte_event_send(struct net_device *dev, char *buf, int len)
-{
-	struct phy_dev *phy_dev = ((struct nic *)netdev_priv(dev))->phy_dev;
-	struct hci_packet *hci = (struct hci_packet *)buf;
-	int length;
-	int idx;
-	int ret;
-
-	ret = sscanf(dev->name, "lte%d", &idx);
-	if (ret != 1)
-		return -EINVAL;
-
-	length = gdm_dev16_to_cpu(phy_dev->get_endian(phy_dev->priv_dev),
-				  hci->len) + HCI_HEADER_SIZE;
-	return netlink_send(lte_event.sock, idx, 0, buf, length, dev);
-}
-
-static void gdm_lte_event_rcv(struct net_device *dev, u16 type,
-			      void *msg, int len)
-{
-	struct nic *nic = netdev_priv(dev);
-
-	nic->phy_dev->send_hci_func(nic->phy_dev->priv_dev, msg, len, NULL,
-				    NULL);
-}
-
-int gdm_lte_event_init(void)
-{
-	if (lte_event.ref_cnt == 0)
-		lte_event.sock = netlink_init(NETLINK_LTE, gdm_lte_event_rcv);
-
-	if (lte_event.sock) {
-		lte_event.ref_cnt++;
-		return 0;
-	}
-
-	pr_err("event init failed\n");
-	return -ENODATA;
-}
-
-void gdm_lte_event_exit(void)
-{
-	if (lte_event.sock && --lte_event.ref_cnt == 0) {
-		sock_release(lte_event.sock->sk_socket);
-		lte_event.sock = NULL;
-	}
-}
-
-static int find_dev_index(u32 nic_type)
-{
-	u8 index;
-
-	index = (u8)(nic_type & 0x0000000f);
-	if (index >= MAX_NIC_TYPE)
-		return -EINVAL;
-
-	return index;
-}
-
-static void gdm_lte_netif_rx(struct net_device *dev, char *buf,
-			     int len, int flagged_nic_type)
-{
-	u32 nic_type;
-	struct nic *nic;
-	struct sk_buff *skb;
-	struct ethhdr eth;
-	struct vlan_ethhdr vlan_eth;
-	void *mac_header_data;
-	u32 mac_header_len;
-	char ip_version = 0;
-
-	nic_type = flagged_nic_type & NIC_TYPE_MASK;
-	nic = netdev_priv(dev);
-
-	if (flagged_nic_type & NIC_TYPE_F_DHCP) {
-		/* Change the destination mac address
-		 * with the one requested the IP
-		 */
-		if (flagged_nic_type & NIC_TYPE_F_IPV4) {
-			struct dhcp_packet {
-				u8 op;      /* BOOTREQUEST or BOOTREPLY */
-				u8 htype;   /* hardware address type.
-					     * 1 = 10mb ethernet
-					     */
-				u8 hlen;    /* hardware address length */
-				u8 hops;    /* used by relay agents only */
-				u32 xid;    /* unique id */
-				u16 secs;   /* elapsed since client began
-					     * acquisition/renewal
-					     */
-				u16 flags;  /* only one flag so far: */
-				#define BROADCAST_FLAG 0x8000
-				/* "I need broadcast replies" */
-				u32 ciaddr; /* client IP (if client is in
-					     * BOUND, RENEW or REBINDING state)
-					     */
-				u32 yiaddr; /* 'your' (client) IP address */
-				/* IP address of next server to use in
-				 * bootstrap, returned in DHCPOFFER,
-				 * DHCPACK by server
-				 */
-				u32 siaddr_nip;
-				u32 gateway_nip; /* relay agent IP address */
-				u8 chaddr[16];   /* link-layer client hardware
-						  * address (MAC)
-						  */
-				u8 sname[64];    /* server host name (ASCIZ) */
-				u8 file[128];    /* boot file name (ASCIZ) */
-				u32 cookie;      /* fixed first four option
-						  * bytes (99,130,83,99 dec)
-						  */
-			} __packed;
-			int offset = sizeof(struct iphdr) +
-				     sizeof(struct udphdr) +
-				     offsetof(struct dhcp_packet, chaddr);
-			if (offset + ETH_ALEN > len)
-				return;
-			ether_addr_copy(nic->dest_mac_addr, buf + offset);
-		}
-	}
-
-	if (nic->vlan_id > 0) {
-		mac_header_data = (void *)&vlan_eth;
-		mac_header_len = VLAN_ETH_HLEN;
-	} else {
-		mac_header_data = (void *)&eth;
-		mac_header_len = ETH_HLEN;
-	}
-
-	/* Format the data so that it can be put to skb */
-	ether_addr_copy(mac_header_data, nic->dest_mac_addr);
-	memcpy(mac_header_data + ETH_ALEN, nic->src_mac_addr, ETH_ALEN);
-
-	vlan_eth.h_vlan_TCI = htons(nic->vlan_id);
-	vlan_eth.h_vlan_proto = htons(ETH_P_8021Q);
-
-	if (nic_type == NIC_TYPE_ARP) {
-		/* Should be response: Only happens because
-		 * there was a request from the host
-		 */
-		eth.h_proto = htons(ETH_P_ARP);
-		vlan_eth.h_vlan_encapsulated_proto = htons(ETH_P_ARP);
-	} else {
-		ip_version = buf[0] >> 4;
-		if (ip_version == IP_VERSION_4) {
-			eth.h_proto = htons(ETH_P_IP);
-			vlan_eth.h_vlan_encapsulated_proto = htons(ETH_P_IP);
-		} else if (ip_version == IP_VERSION_6) {
-			eth.h_proto = htons(ETH_P_IPV6);
-			vlan_eth.h_vlan_encapsulated_proto = htons(ETH_P_IPV6);
-		} else {
-			netdev_err(dev, "Unknown IP version %d\n", ip_version);
-			return;
-		}
-	}
-
-	/* Alloc skb and reserve align */
-	skb = dev_alloc_skb(len + mac_header_len + NET_IP_ALIGN);
-	if (!skb)
-		return;
-	skb_reserve(skb, NET_IP_ALIGN);
-
-	skb_put_data(skb, mac_header_data, mac_header_len);
-	skb_put_data(skb, buf, len);
-
-	skb->protocol = ((struct ethhdr *)mac_header_data)->h_proto;
-	skb->dev = dev;
-	skb_reset_mac_header(skb);
-	skb_pull(skb, ETH_HLEN);
-
-	gdm_lte_rx(skb, nic, nic_type);
-}
-
-static void gdm_lte_multi_sdu_pkt(struct phy_dev *phy_dev, char *buf, int len)
-{
-	struct net_device *dev;
-	struct multi_sdu *multi_sdu = (struct multi_sdu *)buf;
-	struct sdu *sdu = NULL;
-	u8 endian = phy_dev->get_endian(phy_dev->priv_dev);
-	u8 *data = (u8 *)multi_sdu->data;
-	int copied;
-	u16 i = 0;
-	u16 num_packet;
-	u16 hci_len;
-	u16 cmd_evt;
-	u32 nic_type;
-	int index;
-
-	num_packet = gdm_dev16_to_cpu(endian, multi_sdu->num_packet);
-
-	for (i = 0; i < num_packet; i++) {
-		copied = data - multi_sdu->data;
-		if (len < copied + sizeof(*sdu)) {
-			pr_err("rx prevent buffer overflow");
-			return;
-		}
-
-		sdu = (struct sdu *)data;
-
-		cmd_evt  = gdm_dev16_to_cpu(endian, sdu->cmd_evt);
-		hci_len  = gdm_dev16_to_cpu(endian, sdu->len);
-		nic_type = gdm_dev32_to_cpu(endian, sdu->nic_type);
-
-		if (cmd_evt != LTE_RX_SDU) {
-			pr_err("rx sdu wrong hci %04x\n", cmd_evt);
-			return;
-		}
-		if (hci_len < 12 ||
-		    len < copied + sizeof(*sdu) + (hci_len - 12)) {
-			pr_err("rx sdu invalid len %d\n", hci_len);
-			return;
-		}
-
-		index = find_dev_index(nic_type);
-		if (index < 0) {
-			pr_err("rx sdu invalid nic_type :%x\n", nic_type);
-			return;
-		}
-		dev = phy_dev->dev[index];
-		gdm_lte_netif_rx(dev, (char *)sdu->data,
-				 (int)(hci_len - 12), nic_type);
-
-		data += ((hci_len + 3) & 0xfffc) + HCI_HEADER_SIZE;
-	}
-}
-
-static void gdm_lte_pdn_table(struct net_device *dev, char *buf, int len)
-{
-	struct nic *nic = netdev_priv(dev);
-	struct hci_pdn_table_ind *pdn_table = (struct hci_pdn_table_ind *)buf;
-	u8 ed = nic->phy_dev->get_endian(nic->phy_dev->priv_dev);
-
-	if (!pdn_table->activate) {
-		memset(&nic->pdn_table, 0x00, sizeof(struct pdn_table));
-		netdev_info(dev, "pdn deactivated\n");
-
-		return;
-	}
-
-	nic->pdn_table.activate = pdn_table->activate;
-	nic->pdn_table.dft_eps_id = gdm_dev32_to_cpu(ed, pdn_table->dft_eps_id);
-	nic->pdn_table.nic_type = gdm_dev32_to_cpu(ed, pdn_table->nic_type);
-
-	netdev_info(dev, "pdn activated, nic_type=0x%x\n",
-		    nic->pdn_table.nic_type);
-}
-
-static int gdm_lte_receive_pkt(struct phy_dev *phy_dev, char *buf, int len)
-{
-	struct hci_packet *hci = (struct hci_packet *)buf;
-	struct hci_pdn_table_ind *pdn_table = (struct hci_pdn_table_ind *)buf;
-	struct sdu *sdu;
-	struct net_device *dev;
-	u8 endian = phy_dev->get_endian(phy_dev->priv_dev);
-	int ret = 0;
-	u16 cmd_evt;
-	u32 nic_type;
-	int index;
-
-	if (!len)
-		return ret;
-
-	cmd_evt = gdm_dev16_to_cpu(endian, hci->cmd_evt);
-
-	dev = phy_dev->dev[0];
-	if (!dev)
-		return 0;
-
-	switch (cmd_evt) {
-	case LTE_RX_SDU:
-		sdu = (struct sdu *)hci->data;
-		nic_type = gdm_dev32_to_cpu(endian, sdu->nic_type);
-		index = find_dev_index(nic_type);
-		if (index < 0)
-			return index;
-		dev = phy_dev->dev[index];
-		gdm_lte_netif_rx(dev, hci->data, len, nic_type);
-		break;
-	case LTE_RX_MULTI_SDU:
-		gdm_lte_multi_sdu_pkt(phy_dev, buf, len);
-		break;
-	case LTE_LINK_ON_OFF_INDICATION:
-		netdev_info(dev, "link %s\n",
-			    ((struct hci_connect_ind *)buf)->connect
-			    ? "on" : "off");
-		break;
-	case LTE_PDN_TABLE_IND:
-		pdn_table = (struct hci_pdn_table_ind *)buf;
-		nic_type = gdm_dev32_to_cpu(endian, pdn_table->nic_type);
-		index = find_dev_index(nic_type);
-		if (index < 0)
-			return index;
-		dev = phy_dev->dev[index];
-		gdm_lte_pdn_table(dev, buf, len);
-		fallthrough;
-	default:
-		ret = gdm_lte_event_send(dev, buf, len);
-		break;
-	}
-
-	return ret;
-}
-
-static int rx_complete(void *arg, void *data, int len, int context)
-{
-	struct phy_dev *phy_dev = arg;
-
-	return gdm_lte_receive_pkt(phy_dev, data, len);
-}
-
-void start_rx_proc(struct phy_dev *phy_dev)
-{
-	int i;
-
-	for (i = 0; i < MAX_RX_SUBMIT_COUNT; i++)
-		phy_dev->rcv_func(phy_dev->priv_dev,
-				rx_complete, phy_dev, USB_COMPLETE);
-}
-
-static const struct net_device_ops gdm_netdev_ops = {
-	.ndo_open			= gdm_lte_open,
-	.ndo_stop			= gdm_lte_close,
-	.ndo_set_config			= gdm_lte_set_config,
-	.ndo_start_xmit			= gdm_lte_tx,
-	.ndo_get_stats			= gdm_lte_stats,
-};
-
-static u8 gdm_lte_macaddr[ETH_ALEN] = {0x00, 0x0a, 0x3b, 0x00, 0x00, 0x00};
-
-static void form_mac_address(u8 *dev_addr, u8 *nic_src, u8 *nic_dest,
-			     u8 *mac_address, u8 index)
-{
-	/* Form the dev_addr */
-	if (!mac_address)
-		ether_addr_copy(dev_addr, gdm_lte_macaddr);
-	else
-		ether_addr_copy(dev_addr, mac_address);
-
-	/* The last byte of the mac address
-	 * should be less than or equal to 0xFC
-	 */
-	dev_addr[ETH_ALEN - 1] += index;
-
-	/* Create random nic src and copy the first
-	 * 3 bytes to be the same as dev_addr
-	 */
-	eth_random_addr(nic_src);
-	memcpy(nic_src, dev_addr, 3);
-
-	/* Copy the nic_dest from dev_addr*/
-	ether_addr_copy(nic_dest, dev_addr);
-}
-
-static void validate_mac_address(u8 *mac_address)
-{
-	/* if zero address or multicast bit set, restore the default value */
-	if (is_zero_ether_addr(mac_address) || (mac_address[0] & 0x01)) {
-		pr_err("MAC invalid, restoring default\n");
-		memcpy(mac_address, gdm_lte_macaddr, 6);
-	}
-}
-
-int register_lte_device(struct phy_dev *phy_dev,
-			struct device *dev, u8 *mac_address)
-{
-	struct nic *nic;
-	struct net_device *net;
-	char pdn_dev_name[16];
-	u8 addr[ETH_ALEN];
-	int ret = 0;
-	u8 index;
-
-	validate_mac_address(mac_address);
-
-	for (index = 0; index < MAX_NIC_TYPE; index++) {
-		/* Create device name lteXpdnX */
-		sprintf(pdn_dev_name, "lte%%dpdn%d", index);
-
-		/* Allocate netdev */
-		net = alloc_netdev(sizeof(struct nic), pdn_dev_name,
-				   NET_NAME_UNKNOWN, ether_setup);
-		if (!net) {
-			ret = -ENOMEM;
-			goto err;
-		}
-		net->netdev_ops = &gdm_netdev_ops;
-		net->flags &= ~IFF_MULTICAST;
-		net->mtu = DEFAULT_MTU_SIZE;
-
-		nic = netdev_priv(net);
-		memset(nic, 0, sizeof(struct nic));
-		nic->netdev = net;
-		nic->phy_dev = phy_dev;
-		nic->nic_id = index;
-
-		form_mac_address(addr,
-				 nic->src_mac_addr,
-				 nic->dest_mac_addr,
-				 mac_address,
-				 index);
-		eth_hw_addr_set(net, addr);
-
-		SET_NETDEV_DEV(net, dev);
-		SET_NETDEV_DEVTYPE(net, &wwan_type);
-
-		ret = register_netdev(net);
-		if (ret)
-			goto err;
-
-		netif_carrier_on(net);
-
-		phy_dev->dev[index] = net;
-	}
-
-	return 0;
-
-err:
-	unregister_lte_device(phy_dev);
-
-	return ret;
-}
-
-void unregister_lte_device(struct phy_dev *phy_dev)
-{
-	struct net_device *net;
-	int index;
-
-	for (index = 0; index < MAX_NIC_TYPE; index++) {
-		net = phy_dev->dev[index];
-		if (!net)
-			continue;
-
-		unregister_netdev(net);
-		free_netdev(net);
-	}
-}
diff --git a/drivers/staging/gdm724x/gdm_lte.h b/drivers/staging/gdm724x/gdm_lte.h
deleted file mode 100644
index f2143a6e0e99..000000000000
--- a/drivers/staging/gdm724x/gdm_lte.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#ifndef _GDM_LTE_H_
-#define _GDM_LTE_H_
-
-#include <linux/netdevice.h>
-#include <linux/types.h>
-
-#include "gdm_endian.h"
-
-#define MAX_NIC_TYPE		4
-#define MAX_RX_SUBMIT_COUNT	3
-#define DRIVER_VERSION		"3.7.17.0"
-
-enum TX_ERROR_CODE {
-	TX_NO_ERROR = 0,
-	TX_NO_DEV,
-	TX_NO_SPC,
-	TX_NO_BUFFER,
-};
-
-enum CALLBACK_CONTEXT {
-	KERNEL_THREAD = 0,
-	USB_COMPLETE,
-};
-
-struct pdn_table {
-	u8 activate;
-	u32 dft_eps_id;
-	u32 nic_type;
-} __packed;
-
-struct nic;
-
-struct phy_dev {
-	void	*priv_dev;
-	struct net_device *dev[MAX_NIC_TYPE];
-	int	(*send_hci_func)(void *priv_dev, void *data, int len,
-				 void (*cb)(void *cb_data), void *cb_data);
-	int	(*send_sdu_func)(void *priv_dev, void *data, int len,
-				 unsigned int dft_eps_id, unsigned int eps_id,
-				 void (*cb)(void *cb_data), void *cb_data,
-				 int dev_idx, int nic_type);
-	int	(*rcv_func)(void *priv_dev,
-			    int (*cb)(void *cb_data, void *data, int len,
-				      int context),
-			    void *cb_data, int context);
-	u8 (*get_endian)(void *priv_dev);
-};
-
-struct nic {
-	struct net_device *netdev;
-	struct phy_dev *phy_dev;
-	struct net_device_stats stats;
-	struct pdn_table pdn_table;
-	u8 dest_mac_addr[ETH_ALEN];
-	u8 src_mac_addr[ETH_ALEN];
-	u32 nic_id;
-	u16 vlan_id;
-};
-
-int gdm_lte_event_init(void);
-void gdm_lte_event_exit(void);
-
-void start_rx_proc(struct phy_dev *phy_dev);
-int register_lte_device(struct phy_dev *phy_dev, struct device *dev,
-			u8 *mac_address);
-void unregister_lte_device(struct phy_dev *phy_dev);
-
-#endif /* _GDM_LTE_H_ */
diff --git a/drivers/staging/gdm724x/gdm_mux.c b/drivers/staging/gdm724x/gdm_mux.c
deleted file mode 100644
index 82302c6266eb..000000000000
--- a/drivers/staging/gdm724x/gdm_mux.c
+++ /dev/null
@@ -1,668 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/usb.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/tty.h>
-#include <linux/tty_driver.h>
-#include <linux/tty_flip.h>
-#include <linux/slab.h>
-#include <linux/usb/cdc.h>
-
-#include "gdm_mux.h"
-
-static u16 packet_type_for_tty_index[TTY_MAX_COUNT] = {0xF011, 0xF010};
-
-#define USB_DEVICE_CDC_DATA(vid, pid) \
-	.match_flags = \
-		USB_DEVICE_ID_MATCH_DEVICE |\
-		USB_DEVICE_ID_MATCH_INT_CLASS |\
-		USB_DEVICE_ID_MATCH_INT_SUBCLASS,\
-	.idVendor = vid,\
-	.idProduct = pid,\
-	.bInterfaceClass = USB_CLASS_COMM,\
-	.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM
-
-static const struct usb_device_id id_table[] = {
-	{ USB_DEVICE_CDC_DATA(0x1076, 0x8000) }, /* GCT GDM7240 */
-	{ USB_DEVICE_CDC_DATA(0x1076, 0x8f00) }, /* GCT GDM7243 */
-	{ USB_DEVICE_CDC_DATA(0x1076, 0x9000) }, /* GCT GDM7243 */
-	{ USB_DEVICE_CDC_DATA(0x1d74, 0x2300) }, /* LGIT Phoenix */
-	{}
-};
-
-MODULE_DEVICE_TABLE(usb, id_table);
-
-static int packet_type_to_tty_index(u16 packet_type)
-{
-	int i;
-
-	for (i = 0; i < TTY_MAX_COUNT; i++) {
-		if (packet_type_for_tty_index[i] == packet_type)
-			return i;
-	}
-
-	return -ENOENT;
-}
-
-static struct mux_tx *alloc_mux_tx(int len)
-{
-	struct mux_tx *t;
-
-	t = kzalloc(sizeof(*t), GFP_ATOMIC);
-	if (!t)
-		return NULL;
-
-	t->urb = usb_alloc_urb(0, GFP_ATOMIC);
-	t->buf = kmalloc(MUX_TX_MAX_SIZE, GFP_ATOMIC);
-	if (!t->urb || !t->buf) {
-		usb_free_urb(t->urb);
-		kfree(t->buf);
-		kfree(t);
-		return NULL;
-	}
-
-	return t;
-}
-
-static void free_mux_tx(struct mux_tx *t)
-{
-	if (t) {
-		usb_free_urb(t->urb);
-		kfree(t->buf);
-		kfree(t);
-	}
-}
-
-static struct mux_rx *alloc_mux_rx(void)
-{
-	struct mux_rx *r;
-
-	r = kzalloc(sizeof(*r), GFP_KERNEL);
-	if (!r)
-		return NULL;
-
-	r->urb = usb_alloc_urb(0, GFP_KERNEL);
-	r->buf = kmalloc(MUX_RX_MAX_SIZE, GFP_KERNEL);
-	if (!r->urb || !r->buf) {
-		usb_free_urb(r->urb);
-		kfree(r->buf);
-		kfree(r);
-		return NULL;
-	}
-
-	return r;
-}
-
-static void free_mux_rx(struct mux_rx *r)
-{
-	if (r) {
-		usb_free_urb(r->urb);
-		kfree(r->buf);
-		kfree(r);
-	}
-}
-
-static struct mux_rx *get_rx_struct(struct rx_cxt *rx)
-{
-	struct mux_rx *r;
-	unsigned long flags;
-
-	spin_lock_irqsave(&rx->free_list_lock, flags);
-
-	if (list_empty(&rx->rx_free_list)) {
-		spin_unlock_irqrestore(&rx->free_list_lock, flags);
-		return NULL;
-	}
-
-	r = list_entry(rx->rx_free_list.prev, struct mux_rx, free_list);
-	list_del(&r->free_list);
-
-	spin_unlock_irqrestore(&rx->free_list_lock, flags);
-
-	return r;
-}
-
-static void put_rx_struct(struct rx_cxt *rx, struct mux_rx *r)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&rx->free_list_lock, flags);
-	list_add_tail(&r->free_list, &rx->rx_free_list);
-	spin_unlock_irqrestore(&rx->free_list_lock, flags);
-}
-
-static int up_to_host(struct mux_rx *r)
-{
-	struct mux_dev *mux_dev = r->mux_dev;
-	struct mux_pkt_header *mux_header;
-	unsigned int start_flag;
-	unsigned int payload_size;
-	unsigned short packet_type;
-	int total_len;
-	u32 packet_size_sum = r->offset;
-	int index;
-	int ret = TO_HOST_INVALID_PACKET;
-	int len = r->len;
-
-	while (1) {
-		mux_header = (struct mux_pkt_header *)(r->buf +
-						       packet_size_sum);
-		start_flag = __le32_to_cpu(mux_header->start_flag);
-		payload_size = __le32_to_cpu(mux_header->payload_size);
-		packet_type = __le16_to_cpu(mux_header->packet_type);
-
-		if (start_flag != START_FLAG) {
-			pr_err("invalid START_FLAG %x\n", start_flag);
-			break;
-		}
-
-		total_len = ALIGN(MUX_HEADER_SIZE + payload_size, 4);
-
-		if (len - packet_size_sum < total_len) {
-			pr_err("invalid payload : %d %d %04x\n",
-			       payload_size, len, packet_type);
-			break;
-		}
-
-		index = packet_type_to_tty_index(packet_type);
-		if (index < 0) {
-			pr_err("invalid index %d\n", index);
-			break;
-		}
-
-		ret = r->callback(mux_header->data,
-				payload_size,
-				index,
-				mux_dev->tty_dev,
-				RECV_PACKET_PROCESS_CONTINUE
-				);
-		if (ret == TO_HOST_BUFFER_REQUEST_FAIL) {
-			r->offset += packet_size_sum;
-			break;
-		}
-
-		packet_size_sum += total_len;
-		if (len - packet_size_sum <= MUX_HEADER_SIZE + 2) {
-			ret = r->callback(NULL,
-					0,
-					index,
-					mux_dev->tty_dev,
-					RECV_PACKET_PROCESS_COMPLETE
-					);
-			break;
-		}
-	}
-
-	return ret;
-}
-
-static void do_rx(struct work_struct *work)
-{
-	struct mux_dev *mux_dev =
-		container_of(work, struct mux_dev, work_rx.work);
-	struct mux_rx *r;
-	struct rx_cxt *rx = &mux_dev->rx;
-	unsigned long flags;
-	int ret = 0;
-
-	while (1) {
-		spin_lock_irqsave(&rx->to_host_lock, flags);
-		if (list_empty(&rx->to_host_list)) {
-			spin_unlock_irqrestore(&rx->to_host_lock, flags);
-			break;
-		}
-		r = list_entry(rx->to_host_list.next, struct mux_rx,
-			       to_host_list);
-		list_del(&r->to_host_list);
-		spin_unlock_irqrestore(&rx->to_host_lock, flags);
-
-		ret = up_to_host(r);
-		if (ret == TO_HOST_BUFFER_REQUEST_FAIL)
-			pr_err("failed to send mux data to host\n");
-		else
-			put_rx_struct(rx, r);
-	}
-}
-
-static void remove_rx_submit_list(struct mux_rx *r, struct rx_cxt *rx)
-{
-	unsigned long flags;
-	struct mux_rx	*r_remove, *r_remove_next;
-
-	spin_lock_irqsave(&rx->submit_list_lock, flags);
-	list_for_each_entry_safe(r_remove, r_remove_next, &rx->rx_submit_list,
-				 rx_submit_list) {
-		if (r == r_remove)
-			list_del(&r->rx_submit_list);
-	}
-	spin_unlock_irqrestore(&rx->submit_list_lock, flags);
-}
-
-static void gdm_mux_rcv_complete(struct urb *urb)
-{
-	struct mux_rx *r = urb->context;
-	struct mux_dev *mux_dev = r->mux_dev;
-	struct rx_cxt *rx = &mux_dev->rx;
-	unsigned long flags;
-
-	remove_rx_submit_list(r, rx);
-
-	if (urb->status) {
-		if (mux_dev->usb_state == PM_NORMAL)
-			dev_err(&urb->dev->dev, "%s: urb status error %d\n",
-				__func__, urb->status);
-		put_rx_struct(rx, r);
-	} else {
-		r->len = r->urb->actual_length;
-		spin_lock_irqsave(&rx->to_host_lock, flags);
-		list_add_tail(&r->to_host_list, &rx->to_host_list);
-		schedule_work(&mux_dev->work_rx.work);
-		spin_unlock_irqrestore(&rx->to_host_lock, flags);
-	}
-}
-
-static int gdm_mux_recv(void *priv_dev,
-			int (*cb)(void *data, int len, int tty_index,
-				  struct tty_dev *tty_dev, int complete))
-{
-	struct mux_dev *mux_dev = priv_dev;
-	struct usb_device *usbdev = mux_dev->usbdev;
-	struct mux_rx *r;
-	struct rx_cxt *rx = &mux_dev->rx;
-	unsigned long flags;
-	int ret;
-
-	if (!usbdev) {
-		pr_err("device is disconnected\n");
-		return -ENODEV;
-	}
-
-	r = get_rx_struct(rx);
-	if (!r) {
-		pr_err("get_rx_struct fail\n");
-		return -ENOMEM;
-	}
-
-	r->offset = 0;
-	r->mux_dev = (void *)mux_dev;
-	r->callback = cb;
-	mux_dev->rx_cb = cb;
-
-	usb_fill_bulk_urb(r->urb,
-			  usbdev,
-			  usb_rcvbulkpipe(usbdev, 0x86),
-			  r->buf,
-			  MUX_RX_MAX_SIZE,
-			  gdm_mux_rcv_complete,
-			  r);
-
-	spin_lock_irqsave(&rx->submit_list_lock, flags);
-	list_add_tail(&r->rx_submit_list, &rx->rx_submit_list);
-	spin_unlock_irqrestore(&rx->submit_list_lock, flags);
-
-	ret = usb_submit_urb(r->urb, GFP_KERNEL);
-
-	if (ret) {
-		spin_lock_irqsave(&rx->submit_list_lock, flags);
-		list_del(&r->rx_submit_list);
-		spin_unlock_irqrestore(&rx->submit_list_lock, flags);
-
-		put_rx_struct(rx, r);
-
-		pr_err("usb_submit_urb ret=%d\n", ret);
-	}
-
-	usb_mark_last_busy(usbdev);
-
-	return ret;
-}
-
-static void gdm_mux_send_complete(struct urb *urb)
-{
-	struct mux_tx *t = urb->context;
-
-	if (urb->status == -ECONNRESET) {
-		dev_info(&urb->dev->dev, "CONNRESET\n");
-		free_mux_tx(t);
-		return;
-	}
-
-	if (t->callback)
-		t->callback(t->cb_data);
-
-	free_mux_tx(t);
-}
-
-static int gdm_mux_send(void *priv_dev, void *data, int len, int tty_index,
-			void (*cb)(void *data), void *cb_data)
-{
-	struct mux_dev *mux_dev = priv_dev;
-	struct usb_device *usbdev = mux_dev->usbdev;
-	struct mux_pkt_header *mux_header;
-	struct mux_tx *t = NULL;
-	static u32 seq_num = 1;
-	int total_len;
-	int ret;
-	unsigned long flags;
-
-	if (mux_dev->usb_state == PM_SUSPEND) {
-		ret = usb_autopm_get_interface(mux_dev->intf);
-		if (!ret)
-			usb_autopm_put_interface(mux_dev->intf);
-	}
-
-	spin_lock_irqsave(&mux_dev->write_lock, flags);
-
-	total_len = ALIGN(MUX_HEADER_SIZE + len, 4);
-
-	t = alloc_mux_tx(total_len);
-	if (!t) {
-		pr_err("alloc_mux_tx fail\n");
-		spin_unlock_irqrestore(&mux_dev->write_lock, flags);
-		return -ENOMEM;
-	}
-
-	mux_header = (struct mux_pkt_header *)t->buf;
-	mux_header->start_flag = __cpu_to_le32(START_FLAG);
-	mux_header->seq_num = __cpu_to_le32(seq_num++);
-	mux_header->payload_size = __cpu_to_le32((u32)len);
-	mux_header->packet_type = __cpu_to_le16(packet_type_for_tty_index[tty_index]);
-
-	memcpy(t->buf + MUX_HEADER_SIZE, data, len);
-	memset(t->buf + MUX_HEADER_SIZE + len, 0,
-	       total_len - MUX_HEADER_SIZE - len);
-
-	t->len = total_len;
-	t->callback = cb;
-	t->cb_data = cb_data;
-
-	usb_fill_bulk_urb(t->urb,
-			  usbdev,
-			  usb_sndbulkpipe(usbdev, 5),
-			  t->buf,
-			  total_len,
-			  gdm_mux_send_complete,
-			  t);
-
-	ret = usb_submit_urb(t->urb, GFP_ATOMIC);
-
-	spin_unlock_irqrestore(&mux_dev->write_lock, flags);
-
-	if (ret)
-		pr_err("usb_submit_urb Error: %d\n", ret);
-
-	usb_mark_last_busy(usbdev);
-
-	return ret;
-}
-
-static int gdm_mux_send_control(void *priv_dev, int request, int value,
-				void *buf, int len)
-{
-	struct mux_dev *mux_dev = priv_dev;
-	struct usb_device *usbdev = mux_dev->usbdev;
-	int ret;
-
-	ret = usb_control_msg(usbdev,
-			      usb_sndctrlpipe(usbdev, 0),
-			      request,
-			      USB_RT_ACM,
-			      value,
-			      2,
-			      buf,
-			      len,
-			      5000
-			     );
-
-	if (ret < 0)
-		pr_err("usb_control_msg error: %d\n", ret);
-
-	return min(ret, 0);
-}
-
-static void release_usb(struct mux_dev *mux_dev)
-{
-	struct rx_cxt		*rx = &mux_dev->rx;
-	struct mux_rx		*r, *r_next;
-	unsigned long		flags;
-
-	cancel_delayed_work(&mux_dev->work_rx);
-
-	spin_lock_irqsave(&rx->submit_list_lock, flags);
-	list_for_each_entry_safe(r, r_next, &rx->rx_submit_list,
-				 rx_submit_list) {
-		spin_unlock_irqrestore(&rx->submit_list_lock, flags);
-		usb_kill_urb(r->urb);
-		spin_lock_irqsave(&rx->submit_list_lock, flags);
-	}
-	spin_unlock_irqrestore(&rx->submit_list_lock, flags);
-
-	spin_lock_irqsave(&rx->free_list_lock, flags);
-	list_for_each_entry_safe(r, r_next, &rx->rx_free_list, free_list) {
-		list_del(&r->free_list);
-		free_mux_rx(r);
-	}
-	spin_unlock_irqrestore(&rx->free_list_lock, flags);
-
-	spin_lock_irqsave(&rx->to_host_lock, flags);
-	list_for_each_entry_safe(r, r_next, &rx->to_host_list, to_host_list) {
-		if (r->mux_dev == (void *)mux_dev) {
-			list_del(&r->to_host_list);
-			free_mux_rx(r);
-		}
-	}
-	spin_unlock_irqrestore(&rx->to_host_lock, flags);
-}
-
-static int init_usb(struct mux_dev *mux_dev)
-{
-	struct mux_rx *r;
-	struct rx_cxt *rx = &mux_dev->rx;
-	int ret = 0;
-	int i;
-
-	spin_lock_init(&mux_dev->write_lock);
-	INIT_LIST_HEAD(&rx->to_host_list);
-	INIT_LIST_HEAD(&rx->rx_submit_list);
-	INIT_LIST_HEAD(&rx->rx_free_list);
-	spin_lock_init(&rx->to_host_lock);
-	spin_lock_init(&rx->submit_list_lock);
-	spin_lock_init(&rx->free_list_lock);
-
-	for (i = 0; i < MAX_ISSUE_NUM * 2; i++) {
-		r = alloc_mux_rx();
-		if (!r) {
-			ret = -ENOMEM;
-			break;
-		}
-
-		list_add(&r->free_list, &rx->rx_free_list);
-	}
-
-	INIT_DELAYED_WORK(&mux_dev->work_rx, do_rx);
-
-	return ret;
-}
-
-static int gdm_mux_probe(struct usb_interface *intf,
-			 const struct usb_device_id *id)
-{
-	struct mux_dev *mux_dev;
-	struct tty_dev *tty_dev;
-	u16 idVendor, idProduct;
-	int bInterfaceNumber;
-	int ret;
-	int i;
-	struct usb_device *usbdev = interface_to_usbdev(intf);
-
-	bInterfaceNumber = intf->cur_altsetting->desc.bInterfaceNumber;
-
-	idVendor = __le16_to_cpu(usbdev->descriptor.idVendor);
-	idProduct = __le16_to_cpu(usbdev->descriptor.idProduct);
-
-	pr_info("mux vid = 0x%04x pid = 0x%04x\n", idVendor, idProduct);
-
-	if (bInterfaceNumber != 2)
-		return -ENODEV;
-
-	mux_dev = kzalloc(sizeof(*mux_dev), GFP_KERNEL);
-	if (!mux_dev)
-		return -ENOMEM;
-
-	tty_dev = kzalloc(sizeof(*tty_dev), GFP_KERNEL);
-	if (!tty_dev) {
-		ret = -ENOMEM;
-		goto err_free_mux;
-	}
-
-	mux_dev->usbdev = usbdev;
-	mux_dev->control_intf = intf;
-
-	ret = init_usb(mux_dev);
-	if (ret)
-		goto err_free_usb;
-
-	tty_dev->priv_dev = (void *)mux_dev;
-	tty_dev->send_func = gdm_mux_send;
-	tty_dev->recv_func = gdm_mux_recv;
-	tty_dev->send_control = gdm_mux_send_control;
-
-	ret = register_lte_tty_device(tty_dev, &intf->dev);
-	if (ret)
-		goto err_unregister_tty;
-
-	for (i = 0; i < TTY_MAX_COUNT; i++)
-		mux_dev->tty_dev = tty_dev;
-
-	mux_dev->intf = intf;
-	mux_dev->usb_state = PM_NORMAL;
-
-	usb_get_dev(usbdev);
-	usb_set_intfdata(intf, tty_dev);
-
-	return 0;
-
-err_unregister_tty:
-	unregister_lte_tty_device(tty_dev);
-err_free_usb:
-	release_usb(mux_dev);
-	kfree(tty_dev);
-err_free_mux:
-	kfree(mux_dev);
-
-	return ret;
-}
-
-static void gdm_mux_disconnect(struct usb_interface *intf)
-{
-	struct tty_dev *tty_dev;
-	struct mux_dev *mux_dev;
-	struct usb_device *usbdev = interface_to_usbdev(intf);
-
-	tty_dev = usb_get_intfdata(intf);
-
-	mux_dev = tty_dev->priv_dev;
-
-	release_usb(mux_dev);
-	unregister_lte_tty_device(tty_dev);
-
-	kfree(mux_dev);
-	kfree(tty_dev);
-
-	usb_put_dev(usbdev);
-}
-
-static int gdm_mux_suspend(struct usb_interface *intf, pm_message_t pm_msg)
-{
-	struct tty_dev *tty_dev;
-	struct mux_dev *mux_dev;
-	struct rx_cxt *rx;
-	struct mux_rx *r, *r_next;
-	unsigned long flags;
-
-	tty_dev = usb_get_intfdata(intf);
-	mux_dev = tty_dev->priv_dev;
-	rx = &mux_dev->rx;
-
-	cancel_work_sync(&mux_dev->work_rx.work);
-
-	if (mux_dev->usb_state != PM_NORMAL) {
-		dev_err(intf->usb_dev, "usb suspend - invalid state\n");
-		return -EINVAL;
-	}
-
-	mux_dev->usb_state = PM_SUSPEND;
-
-	spin_lock_irqsave(&rx->submit_list_lock, flags);
-	list_for_each_entry_safe(r, r_next, &rx->rx_submit_list,
-				 rx_submit_list) {
-		spin_unlock_irqrestore(&rx->submit_list_lock, flags);
-		usb_kill_urb(r->urb);
-		spin_lock_irqsave(&rx->submit_list_lock, flags);
-	}
-	spin_unlock_irqrestore(&rx->submit_list_lock, flags);
-
-	return 0;
-}
-
-static int gdm_mux_resume(struct usb_interface *intf)
-{
-	struct tty_dev *tty_dev;
-	struct mux_dev *mux_dev;
-	u8 i;
-
-	tty_dev = usb_get_intfdata(intf);
-	mux_dev = tty_dev->priv_dev;
-
-	if (mux_dev->usb_state != PM_SUSPEND) {
-		dev_err(intf->usb_dev, "usb resume - invalid state\n");
-		return -EINVAL;
-	}
-
-	mux_dev->usb_state = PM_NORMAL;
-
-	for (i = 0; i < MAX_ISSUE_NUM; i++)
-		gdm_mux_recv(mux_dev, mux_dev->rx_cb);
-
-	return 0;
-}
-
-static struct usb_driver gdm_mux_driver = {
-	.name = "gdm_mux",
-	.probe = gdm_mux_probe,
-	.disconnect = gdm_mux_disconnect,
-	.id_table = id_table,
-	.supports_autosuspend = 1,
-	.suspend = gdm_mux_suspend,
-	.resume = gdm_mux_resume,
-	.reset_resume = gdm_mux_resume,
-};
-
-static int __init gdm_usb_mux_init(void)
-{
-	int ret;
-
-	ret = register_lte_tty_driver();
-	if (ret)
-		return ret;
-
-	return usb_register(&gdm_mux_driver);
-}
-
-static void __exit gdm_usb_mux_exit(void)
-{
-	usb_deregister(&gdm_mux_driver);
-	unregister_lte_tty_driver();
-}
-
-module_init(gdm_usb_mux_init);
-module_exit(gdm_usb_mux_exit);
-
-MODULE_DESCRIPTION("GCT LTE TTY Device Driver");
-MODULE_LICENSE("GPL");
diff --git a/drivers/staging/gdm724x/gdm_mux.h b/drivers/staging/gdm724x/gdm_mux.h
deleted file mode 100644
index 87b8d921fdc8..000000000000
--- a/drivers/staging/gdm724x/gdm_mux.h
+++ /dev/null
@@ -1,85 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#ifndef _GDM_MUX_H_
-#define _GDM_MUX_H_
-
-#include <linux/types.h>
-#include <linux/usb.h>
-#include <linux/list.h>
-
-#include "gdm_tty.h"
-
-#define PM_NORMAL 0
-#define PM_SUSPEND 1
-
-#define USB_RT_ACM          (USB_TYPE_CLASS | USB_RECIP_INTERFACE)
-
-#define START_FLAG 0xA512485A
-#define MUX_HEADER_SIZE 14
-#define MUX_TX_MAX_SIZE (1024 * 10)
-#define MUX_RX_MAX_SIZE (1024 * 30)
-#define AT_PKT_TYPE 0xF011
-#define DM_PKT_TYPE 0xF010
-
-#define RETRY_TIMER 30 /* msec */
-
-struct mux_pkt_header {
-	__le32 start_flag;
-	__le32 seq_num;
-	__le32 payload_size;
-	__le16 packet_type;
-	unsigned char data[];
-};
-
-struct mux_tx {
-	struct urb *urb;
-	u8 *buf;
-	int  len;
-	void (*callback)(void *cb_data);
-	void *cb_data;
-};
-
-struct mux_rx {
-	struct list_head free_list;
-	struct list_head rx_submit_list;
-	struct list_head to_host_list;
-	struct urb *urb;
-	u8 *buf;
-	void *mux_dev;
-	u32 offset;
-	u32 len;
-	int (*callback)(void *data,
-			int len,
-			int tty_index,
-			struct tty_dev *tty_dev,
-			int complete);
-};
-
-struct rx_cxt {
-	struct list_head to_host_list;
-	struct list_head rx_submit_list;
-	struct list_head rx_free_list;
-	spinlock_t to_host_lock;
-	spinlock_t submit_list_lock;
-	spinlock_t free_list_lock;
-};
-
-struct mux_dev {
-	struct usb_device *usbdev;
-	struct usb_interface *control_intf;
-	struct usb_interface *data_intf;
-	struct rx_cxt	rx;
-	struct delayed_work work_rx;
-	struct usb_interface *intf;
-	int usb_state;
-	int (*rx_cb)(void *data,
-		     int len,
-		     int tty_index,
-		     struct tty_dev *tty_dev,
-		     int complete);
-	spinlock_t write_lock;
-	struct tty_dev *tty_dev;
-};
-
-#endif /* _GDM_MUX_H_ */
diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
deleted file mode 100644
index 15c246d3b1a3..000000000000
--- a/drivers/staging/gdm724x/gdm_tty.c
+++ /dev/null
@@ -1,316 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/tty.h>
-#include <linux/tty_driver.h>
-#include <linux/tty_flip.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/usb/cdc.h>
-#include <linux/serial.h>
-#include "gdm_tty.h"
-
-#define GDM_TTY_MAJOR 0
-#define GDM_TTY_MINOR 32
-
-#define WRITE_SIZE 2048
-
-#define MUX_TX_MAX_SIZE 2048
-
-static inline bool gdm_tty_ready(struct gdm *gdm)
-{
-	return gdm && gdm->tty_dev && gdm->port.count;
-}
-
-static struct tty_driver *gdm_driver[TTY_MAX_COUNT];
-static struct gdm *gdm_table[TTY_MAX_COUNT][GDM_TTY_MINOR];
-static DEFINE_MUTEX(gdm_table_lock);
-
-static const char *DRIVER_STRING[TTY_MAX_COUNT] = {"GCTATC", "GCTDM"};
-static char *DEVICE_STRING[TTY_MAX_COUNT] = {"GCT-ATC", "GCT-DM"};
-
-static void gdm_port_destruct(struct tty_port *port)
-{
-	struct gdm *gdm = container_of(port, struct gdm, port);
-
-	mutex_lock(&gdm_table_lock);
-	gdm_table[gdm->index][gdm->minor] = NULL;
-	mutex_unlock(&gdm_table_lock);
-
-	kfree(gdm);
-}
-
-static const struct tty_port_operations gdm_port_ops = {
-	.destruct = gdm_port_destruct,
-};
-
-static int gdm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
-{
-	struct gdm *gdm = NULL;
-	int ret;
-
-	ret = match_string(DRIVER_STRING, TTY_MAX_COUNT,
-			   tty->driver->driver_name);
-	if (ret < 0)
-		return -ENODEV;
-
-	mutex_lock(&gdm_table_lock);
-	gdm = gdm_table[ret][tty->index];
-	if (!gdm) {
-		mutex_unlock(&gdm_table_lock);
-		return -ENODEV;
-	}
-
-	tty_port_get(&gdm->port);
-
-	ret = tty_standard_install(driver, tty);
-	if (ret) {
-		tty_port_put(&gdm->port);
-		mutex_unlock(&gdm_table_lock);
-		return ret;
-	}
-
-	tty->driver_data = gdm;
-	mutex_unlock(&gdm_table_lock);
-
-	return 0;
-}
-
-static int gdm_tty_open(struct tty_struct *tty, struct file *filp)
-{
-	struct gdm *gdm = tty->driver_data;
-
-	return tty_port_open(&gdm->port, tty, filp);
-}
-
-static void gdm_tty_cleanup(struct tty_struct *tty)
-{
-	struct gdm *gdm = tty->driver_data;
-
-	tty_port_put(&gdm->port);
-}
-
-static void gdm_tty_hangup(struct tty_struct *tty)
-{
-	struct gdm *gdm = tty->driver_data;
-
-	tty_port_hangup(&gdm->port);
-}
-
-static void gdm_tty_close(struct tty_struct *tty, struct file *filp)
-{
-	struct gdm *gdm = tty->driver_data;
-
-	tty_port_close(&gdm->port, tty, filp);
-}
-
-static int gdm_tty_recv_complete(void *data,
-				 int len,
-				 int index,
-				 struct tty_dev *tty_dev,
-				 int complete)
-{
-	struct gdm *gdm = tty_dev->gdm[index];
-
-	if (!gdm_tty_ready(gdm)) {
-		if (complete == RECV_PACKET_PROCESS_COMPLETE)
-			gdm->tty_dev->recv_func(gdm->tty_dev->priv_dev,
-						gdm_tty_recv_complete);
-		return TO_HOST_PORT_CLOSE;
-	}
-
-	if (data && len) {
-		if (tty_buffer_request_room(&gdm->port, len) == len) {
-			tty_insert_flip_string(&gdm->port, data, len);
-			tty_flip_buffer_push(&gdm->port);
-		} else {
-			return TO_HOST_BUFFER_REQUEST_FAIL;
-		}
-	}
-
-	if (complete == RECV_PACKET_PROCESS_COMPLETE)
-		gdm->tty_dev->recv_func(gdm->tty_dev->priv_dev,
-					gdm_tty_recv_complete);
-
-	return 0;
-}
-
-static void gdm_tty_send_complete(void *arg)
-{
-	struct gdm *gdm = arg;
-
-	if (!gdm_tty_ready(gdm))
-		return;
-
-	tty_port_tty_wakeup(&gdm->port);
-}
-
-static ssize_t gdm_tty_write(struct tty_struct *tty, const u8 *buf, size_t len)
-{
-	struct gdm *gdm = tty->driver_data;
-	size_t remain = len;
-	size_t sent_len = 0;
-
-	if (!gdm_tty_ready(gdm))
-		return -ENODEV;
-
-	while (remain) {
-		size_t sending_len = min_t(size_t, MUX_TX_MAX_SIZE, remain);
-
-		gdm->tty_dev->send_func(gdm->tty_dev->priv_dev,
-					(void *)(buf + sent_len),
-					sending_len,
-					gdm->index,
-					gdm_tty_send_complete,
-					gdm);
-		sent_len += sending_len;
-		remain -= sending_len;
-	}
-
-	return len;
-}
-
-static unsigned int gdm_tty_write_room(struct tty_struct *tty)
-{
-	struct gdm *gdm = tty->driver_data;
-
-	if (!gdm_tty_ready(gdm))
-		return 0;
-
-	return WRITE_SIZE;
-}
-
-int register_lte_tty_device(struct tty_dev *tty_dev, struct device *device)
-{
-	struct gdm *gdm;
-	int i;
-	int j;
-
-	for (i = 0; i < TTY_MAX_COUNT; i++) {
-		gdm = kmalloc(sizeof(*gdm), GFP_KERNEL);
-		if (!gdm)
-			return -ENOMEM;
-
-		mutex_lock(&gdm_table_lock);
-		for (j = 0; j < GDM_TTY_MINOR; j++) {
-			if (!gdm_table[i][j])
-				break;
-		}
-
-		if (j == GDM_TTY_MINOR) {
-			kfree(gdm);
-			mutex_unlock(&gdm_table_lock);
-			return -EINVAL;
-		}
-
-		gdm_table[i][j] = gdm;
-		mutex_unlock(&gdm_table_lock);
-
-		tty_dev->gdm[i] = gdm;
-		tty_port_init(&gdm->port);
-
-		gdm->port.ops = &gdm_port_ops;
-		gdm->index = i;
-		gdm->minor = j;
-		gdm->tty_dev = tty_dev;
-
-		tty_port_register_device(&gdm->port, gdm_driver[i],
-					 gdm->minor, device);
-	}
-
-	for (i = 0; i < MAX_ISSUE_NUM; i++)
-		gdm->tty_dev->recv_func(gdm->tty_dev->priv_dev,
-					gdm_tty_recv_complete);
-
-	return 0;
-}
-
-void unregister_lte_tty_device(struct tty_dev *tty_dev)
-{
-	struct gdm *gdm;
-	struct tty_struct *tty;
-	int i;
-
-	for (i = 0; i < TTY_MAX_COUNT; i++) {
-		gdm = tty_dev->gdm[i];
-		if (!gdm)
-			continue;
-
-		mutex_lock(&gdm_table_lock);
-		gdm_table[gdm->index][gdm->minor] = NULL;
-		mutex_unlock(&gdm_table_lock);
-
-		tty = tty_port_tty_get(&gdm->port);
-		if (tty) {
-			tty_vhangup(tty);
-			tty_kref_put(tty);
-		}
-
-		tty_unregister_device(gdm_driver[i], gdm->minor);
-		tty_port_put(&gdm->port);
-	}
-}
-
-static const struct tty_operations gdm_tty_ops = {
-	.install =	gdm_tty_install,
-	.open =		gdm_tty_open,
-	.close =	gdm_tty_close,
-	.cleanup =	gdm_tty_cleanup,
-	.hangup =	gdm_tty_hangup,
-	.write =	gdm_tty_write,
-	.write_room =	gdm_tty_write_room,
-};
-
-int register_lte_tty_driver(void)
-{
-	struct tty_driver *tty_driver;
-	int i;
-	int ret;
-
-	for (i = 0; i < TTY_MAX_COUNT; i++) {
-		tty_driver = tty_alloc_driver(GDM_TTY_MINOR,
-				TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV);
-		if (IS_ERR(tty_driver))
-			return PTR_ERR(tty_driver);
-
-		tty_driver->owner = THIS_MODULE;
-		tty_driver->driver_name = DRIVER_STRING[i];
-		tty_driver->name = DEVICE_STRING[i];
-		tty_driver->major = GDM_TTY_MAJOR;
-		tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
-		tty_driver->subtype = SERIAL_TYPE_NORMAL;
-		tty_driver->init_termios = tty_std_termios;
-		tty_driver->init_termios.c_cflag = B9600 | CS8 | HUPCL | CLOCAL;
-		tty_driver->init_termios.c_lflag = ISIG | ICANON | IEXTEN;
-		tty_set_operations(tty_driver, &gdm_tty_ops);
-
-		ret = tty_register_driver(tty_driver);
-		if (ret) {
-			tty_driver_kref_put(tty_driver);
-			return ret;
-		}
-
-		gdm_driver[i] = tty_driver;
-	}
-
-	return ret;
-}
-
-void unregister_lte_tty_driver(void)
-{
-	struct tty_driver *tty_driver;
-	int i;
-
-	for (i = 0; i < TTY_MAX_COUNT; i++) {
-		tty_driver = gdm_driver[i];
-		if (tty_driver) {
-			tty_unregister_driver(tty_driver);
-			tty_driver_kref_put(tty_driver);
-		}
-	}
-}
-
diff --git a/drivers/staging/gdm724x/gdm_tty.h b/drivers/staging/gdm724x/gdm_tty.h
deleted file mode 100644
index afec97ced476..000000000000
--- a/drivers/staging/gdm724x/gdm_tty.h
+++ /dev/null
@@ -1,60 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#ifndef _GDM_TTY_H_
-#define _GDM_TTY_H_
-
-#include <linux/types.h>
-#include <linux/tty.h>
-
-#define TTY_MAX_COUNT		2
-
-#define MAX_ISSUE_NUM 3
-
-enum TO_HOST_RESULT {
-	TO_HOST_BUFFER_REQUEST_FAIL = 1,
-	TO_HOST_PORT_CLOSE = 2,
-	TO_HOST_INVALID_PACKET = 3,
-};
-
-enum RECV_PACKET_PROCESS {
-	RECV_PACKET_PROCESS_COMPLETE = 0,
-	RECV_PACKET_PROCESS_CONTINUE = 1,
-};
-
-struct gdm {
-	struct tty_dev *tty_dev;
-	struct tty_port port;
-	unsigned int index;
-	unsigned int minor;
-};
-
-struct tty_dev {
-	void *priv_dev;
-	int (*send_func)(void *priv_dev,
-			 void *data,
-			 int len,
-			 int tty_index,
-			 void (*cb)(void *cb_data),
-			 void *cb_data);
-	int (*recv_func)(void *priv_dev,
-			 int (*cb)(void *data,
-				   int len,
-				   int tty_index,
-				   struct tty_dev *tty_dev,
-				   int complete));
-	int (*send_control)(void *priv_dev,
-			    int request,
-			    int value,
-			    void *data,
-			    int len);
-	struct gdm *gdm[2];
-};
-
-int register_lte_tty_driver(void);
-void unregister_lte_tty_driver(void);
-int register_lte_tty_device(struct tty_dev *tty_dev, struct device *dev);
-void unregister_lte_tty_device(struct tty_dev *tty_dev);
-
-#endif /* _GDM_USB_H_ */
-
diff --git a/drivers/staging/gdm724x/gdm_usb.c b/drivers/staging/gdm724x/gdm_usb.c
deleted file mode 100644
index f666fbeeb44c..000000000000
--- a/drivers/staging/gdm724x/gdm_usb.c
+++ /dev/null
@@ -1,1014 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/usb.h>
-#include <linux/sched.h>
-#include <linux/kthread.h>
-#include <linux/usb/cdc.h>
-#include <linux/wait.h>
-#include <linux/if_ether.h>
-#include <linux/pm_runtime.h>
-
-#include "gdm_usb.h"
-#include "gdm_lte.h"
-#include "hci.h"
-#include "hci_packet.h"
-#include "gdm_endian.h"
-
-#define USB_DEVICE_CDC_DATA(vid, pid) \
-	.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
-		USB_DEVICE_ID_MATCH_INT_CLASS | \
-		USB_DEVICE_ID_MATCH_INT_SUBCLASS,\
-	.idVendor = vid,\
-	.idProduct = pid,\
-	.bInterfaceClass = USB_CLASS_COMM,\
-	.bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET
-
-#define USB_DEVICE_MASS_DATA(vid, pid) \
-	.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
-		USB_DEVICE_ID_MATCH_INT_INFO,\
-	.idVendor = vid,\
-	.idProduct = pid,\
-	.bInterfaceSubClass = USB_SC_SCSI, \
-	.bInterfaceClass = USB_CLASS_MASS_STORAGE,\
-	.bInterfaceProtocol = USB_PR_BULK
-
-static const struct usb_device_id id_table[] = {
-	{ USB_DEVICE_CDC_DATA(VID_GCT, PID_GDM7240) }, /* GCT GDM7240 */
-	{ USB_DEVICE_CDC_DATA(VID_GCT, PID_GDM7243) }, /* GCT GDM7243 */
-	{ }
-};
-
-MODULE_DEVICE_TABLE(usb, id_table);
-
-static void do_tx(struct work_struct *work);
-static void do_rx(struct work_struct *work);
-
-static int gdm_usb_recv(void *priv_dev,
-			int (*cb)(void *cb_data,
-				  void *data, int len, int context),
-			void *cb_data,
-			int context);
-
-static int request_mac_address(struct lte_udev *udev)
-{
-	struct hci_packet *hci;
-	struct usb_device *usbdev = udev->usbdev;
-	int actual;
-	int ret = -1;
-
-	hci = kmalloc(struct_size(hci, data, 1), GFP_KERNEL);
-	if (!hci)
-		return -ENOMEM;
-
-	hci->cmd_evt = gdm_cpu_to_dev16(udev->gdm_ed, LTE_GET_INFORMATION);
-	hci->len = gdm_cpu_to_dev16(udev->gdm_ed, 1);
-	hci->data[0] = MAC_ADDRESS;
-
-	ret = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 2), hci, 5,
-			   &actual, 1000);
-
-	udev->request_mac_addr = 1;
-	kfree(hci);
-
-	return ret;
-}
-
-static struct usb_tx *alloc_tx_struct(int len)
-{
-	struct usb_tx *t = NULL;
-	int ret = 0;
-
-	t = kzalloc(sizeof(*t), GFP_ATOMIC);
-	if (!t) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	t->urb = usb_alloc_urb(0, GFP_ATOMIC);
-	if (!(len % 512))
-		len++;
-
-	t->buf = kmalloc(len, GFP_ATOMIC);
-	if (!t->urb || !t->buf) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-out:
-	if (ret < 0) {
-		if (t) {
-			usb_free_urb(t->urb);
-			kfree(t->buf);
-			kfree(t);
-		}
-		return NULL;
-	}
-
-	return t;
-}
-
-static struct usb_tx_sdu *alloc_tx_sdu_struct(void)
-{
-	struct usb_tx_sdu *t_sdu;
-
-	t_sdu = kzalloc(sizeof(*t_sdu), GFP_KERNEL);
-	if (!t_sdu)
-		return NULL;
-
-	t_sdu->buf = kmalloc(SDU_BUF_SIZE, GFP_KERNEL);
-	if (!t_sdu->buf) {
-		kfree(t_sdu);
-		return NULL;
-	}
-
-	return t_sdu;
-}
-
-static void free_tx_struct(struct usb_tx *t)
-{
-	if (t) {
-		usb_free_urb(t->urb);
-		kfree(t->buf);
-		kfree(t);
-	}
-}
-
-static void free_tx_sdu_struct(struct usb_tx_sdu *t_sdu)
-{
-	if (t_sdu) {
-		kfree(t_sdu->buf);
-		kfree(t_sdu);
-	}
-}
-
-static struct usb_tx_sdu *get_tx_sdu_struct(struct tx_cxt *tx, int *no_spc)
-{
-	struct usb_tx_sdu *t_sdu;
-
-	if (list_empty(&tx->free_list))
-		return NULL;
-
-	t_sdu = list_entry(tx->free_list.next, struct usb_tx_sdu, list);
-	list_del(&t_sdu->list);
-
-	tx->avail_count--;
-
-	*no_spc = list_empty(&tx->free_list) ? 1 : 0;
-
-	return t_sdu;
-}
-
-static void put_tx_struct(struct tx_cxt *tx, struct usb_tx_sdu *t_sdu)
-{
-	list_add_tail(&t_sdu->list, &tx->free_list);
-	tx->avail_count++;
-}
-
-static struct usb_rx *alloc_rx_struct(void)
-{
-	struct usb_rx *r = NULL;
-	int ret = 0;
-
-	r = kmalloc(sizeof(*r), GFP_KERNEL);
-	if (!r) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	r->urb = usb_alloc_urb(0, GFP_KERNEL);
-	r->buf = kmalloc(RX_BUF_SIZE, GFP_KERNEL);
-	if (!r->urb || !r->buf) {
-		ret = -ENOMEM;
-		goto out;
-	}
-out:
-
-	if (ret < 0) {
-		if (r) {
-			usb_free_urb(r->urb);
-			kfree(r->buf);
-			kfree(r);
-		}
-		return NULL;
-	}
-
-	return r;
-}
-
-static void free_rx_struct(struct usb_rx *r)
-{
-	if (r) {
-		usb_free_urb(r->urb);
-		kfree(r->buf);
-		kfree(r);
-	}
-}
-
-static struct usb_rx *get_rx_struct(struct rx_cxt *rx, int *no_spc)
-{
-	struct usb_rx *r;
-	unsigned long flags;
-
-	spin_lock_irqsave(&rx->rx_lock, flags);
-
-	if (list_empty(&rx->free_list)) {
-		spin_unlock_irqrestore(&rx->rx_lock, flags);
-		return NULL;
-	}
-
-	r = list_entry(rx->free_list.next, struct usb_rx, free_list);
-	list_del(&r->free_list);
-
-	rx->avail_count--;
-
-	*no_spc = list_empty(&rx->free_list) ? 1 : 0;
-
-	spin_unlock_irqrestore(&rx->rx_lock, flags);
-
-	return r;
-}
-
-static void put_rx_struct(struct rx_cxt *rx, struct usb_rx *r)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&rx->rx_lock, flags);
-
-	list_add_tail(&r->free_list, &rx->free_list);
-	rx->avail_count++;
-
-	spin_unlock_irqrestore(&rx->rx_lock, flags);
-}
-
-static void release_usb(struct lte_udev *udev)
-{
-	struct rx_cxt	*rx = &udev->rx;
-	struct tx_cxt	*tx = &udev->tx;
-	struct usb_tx	*t, *t_next;
-	struct usb_rx	*r, *r_next;
-	struct usb_tx_sdu	*t_sdu, *t_sdu_next;
-	unsigned long flags;
-
-	spin_lock_irqsave(&tx->lock, flags);
-	list_for_each_entry_safe(t_sdu, t_sdu_next, &tx->sdu_list, list) {
-		list_del(&t_sdu->list);
-		free_tx_sdu_struct(t_sdu);
-	}
-
-	list_for_each_entry_safe(t, t_next, &tx->hci_list, list) {
-		list_del(&t->list);
-		free_tx_struct(t);
-	}
-
-	list_for_each_entry_safe(t_sdu, t_sdu_next, &tx->free_list, list) {
-		list_del(&t_sdu->list);
-		free_tx_sdu_struct(t_sdu);
-	}
-	spin_unlock_irqrestore(&tx->lock, flags);
-
-	spin_lock_irqsave(&rx->submit_lock, flags);
-	list_for_each_entry_safe(r, r_next, &rx->rx_submit_list,
-				 rx_submit_list) {
-		spin_unlock_irqrestore(&rx->submit_lock, flags);
-		usb_kill_urb(r->urb);
-		spin_lock_irqsave(&rx->submit_lock, flags);
-	}
-	spin_unlock_irqrestore(&rx->submit_lock, flags);
-
-	spin_lock_irqsave(&rx->rx_lock, flags);
-	list_for_each_entry_safe(r, r_next, &rx->free_list, free_list) {
-		list_del(&r->free_list);
-		free_rx_struct(r);
-	}
-	spin_unlock_irqrestore(&rx->rx_lock, flags);
-
-	spin_lock_irqsave(&rx->to_host_lock, flags);
-	list_for_each_entry_safe(r, r_next, &rx->to_host_list, to_host_list) {
-		if (r->index == (void *)udev) {
-			list_del(&r->to_host_list);
-			free_rx_struct(r);
-		}
-	}
-	spin_unlock_irqrestore(&rx->to_host_lock, flags);
-}
-
-static int init_usb(struct lte_udev *udev)
-{
-	int ret = 0;
-	int i;
-	struct tx_cxt *tx = &udev->tx;
-	struct rx_cxt *rx = &udev->rx;
-	struct usb_tx_sdu *t_sdu = NULL;
-	struct usb_rx *r = NULL;
-
-	udev->send_complete = 1;
-	udev->tx_stop = 0;
-	udev->request_mac_addr = 0;
-	udev->usb_state = PM_NORMAL;
-
-	INIT_LIST_HEAD(&tx->sdu_list);
-	INIT_LIST_HEAD(&tx->hci_list);
-	INIT_LIST_HEAD(&tx->free_list);
-	INIT_LIST_HEAD(&rx->rx_submit_list);
-	INIT_LIST_HEAD(&rx->free_list);
-	INIT_LIST_HEAD(&rx->to_host_list);
-	spin_lock_init(&tx->lock);
-	spin_lock_init(&rx->rx_lock);
-	spin_lock_init(&rx->submit_lock);
-	spin_lock_init(&rx->to_host_lock);
-
-	tx->avail_count = 0;
-	rx->avail_count = 0;
-
-	udev->rx_cb = NULL;
-
-	for (i = 0; i < MAX_NUM_SDU_BUF; i++) {
-		t_sdu = alloc_tx_sdu_struct();
-		if (!t_sdu) {
-			ret = -ENOMEM;
-			goto fail;
-		}
-
-		list_add(&t_sdu->list, &tx->free_list);
-		tx->avail_count++;
-	}
-
-	for (i = 0; i < MAX_RX_SUBMIT_COUNT * 2; i++) {
-		r = alloc_rx_struct();
-		if (!r) {
-			ret = -ENOMEM;
-			goto fail;
-		}
-
-		list_add(&r->free_list, &rx->free_list);
-		rx->avail_count++;
-	}
-	INIT_DELAYED_WORK(&udev->work_tx, do_tx);
-	INIT_DELAYED_WORK(&udev->work_rx, do_rx);
-	return 0;
-fail:
-	release_usb(udev);
-	return ret;
-}
-
-static int set_mac_address(u8 *data, void *arg)
-{
-	struct phy_dev *phy_dev = arg;
-	struct lte_udev *udev = phy_dev->priv_dev;
-	struct tlv *tlv = (struct tlv *)data;
-	u8 mac_address[ETH_ALEN] = {0, };
-
-	if (tlv->type == MAC_ADDRESS && udev->request_mac_addr) {
-		memcpy(mac_address, tlv->data, tlv->len);
-
-		if (register_lte_device(phy_dev,
-					&udev->intf->dev, mac_address) < 0)
-			pr_err("register lte device failed\n");
-
-		udev->request_mac_addr = 0;
-
-		return 1;
-	}
-
-	return 0;
-}
-
-static void do_rx(struct work_struct *work)
-{
-	struct lte_udev *udev =
-		container_of(work, struct lte_udev, work_rx.work);
-	struct rx_cxt *rx = &udev->rx;
-	struct usb_rx *r;
-	struct hci_packet *hci;
-	struct phy_dev *phy_dev;
-	u16 cmd_evt;
-	int ret;
-	unsigned long flags;
-
-	while (1) {
-		spin_lock_irqsave(&rx->to_host_lock, flags);
-		if (list_empty(&rx->to_host_list)) {
-			spin_unlock_irqrestore(&rx->to_host_lock, flags);
-			break;
-		}
-		r = list_entry(rx->to_host_list.next,
-			       struct usb_rx, to_host_list);
-		list_del(&r->to_host_list);
-		spin_unlock_irqrestore(&rx->to_host_lock, flags);
-
-		phy_dev = r->cb_data;
-		udev = phy_dev->priv_dev;
-		hci = (struct hci_packet *)r->buf;
-		cmd_evt = gdm_dev16_to_cpu(udev->gdm_ed, hci->cmd_evt);
-
-		switch (cmd_evt) {
-		case LTE_GET_INFORMATION_RESULT:
-			if (set_mac_address(hci->data, r->cb_data) == 0) {
-				r->callback(r->cb_data,
-					    r->buf,
-					    r->urb->actual_length,
-					    KERNEL_THREAD);
-			}
-			break;
-
-		default:
-			if (r->callback) {
-				ret = r->callback(r->cb_data,
-						  r->buf,
-						  r->urb->actual_length,
-						  KERNEL_THREAD);
-
-				if (ret == -EAGAIN)
-					pr_err("failed to send received data\n");
-			}
-			break;
-		}
-
-		put_rx_struct(rx, r);
-
-		gdm_usb_recv(udev,
-			     r->callback,
-			     r->cb_data,
-			     USB_COMPLETE);
-	}
-}
-
-static void remove_rx_submit_list(struct usb_rx *r, struct rx_cxt *rx)
-{
-	unsigned long flags;
-	struct usb_rx	*r_remove, *r_remove_next;
-
-	spin_lock_irqsave(&rx->submit_lock, flags);
-	list_for_each_entry_safe(r_remove, r_remove_next,
-				 &rx->rx_submit_list, rx_submit_list) {
-		if (r == r_remove) {
-			list_del(&r->rx_submit_list);
-			break;
-		}
-	}
-	spin_unlock_irqrestore(&rx->submit_lock, flags);
-}
-
-static void gdm_usb_rcv_complete(struct urb *urb)
-{
-	struct usb_rx *r = urb->context;
-	struct rx_cxt *rx = r->rx;
-	unsigned long flags;
-	struct lte_udev *udev = container_of(r->rx, struct lte_udev, rx);
-	struct usb_device *usbdev = udev->usbdev;
-
-	remove_rx_submit_list(r, rx);
-
-	if (!urb->status && r->callback) {
-		spin_lock_irqsave(&rx->to_host_lock, flags);
-		list_add_tail(&r->to_host_list, &rx->to_host_list);
-		schedule_work(&udev->work_rx.work);
-		spin_unlock_irqrestore(&rx->to_host_lock, flags);
-	} else {
-		if (urb->status && udev->usb_state == PM_NORMAL)
-			dev_err(&urb->dev->dev, "%s: urb status error %d\n",
-				__func__, urb->status);
-
-		put_rx_struct(rx, r);
-	}
-
-	usb_mark_last_busy(usbdev);
-}
-
-static int gdm_usb_recv(void *priv_dev,
-			int (*cb)(void *cb_data,
-				  void *data, int len, int context),
-			void *cb_data,
-			int context)
-{
-	struct lte_udev *udev = priv_dev;
-	struct usb_device *usbdev = udev->usbdev;
-	struct rx_cxt *rx = &udev->rx;
-	struct usb_rx *r;
-	int no_spc;
-	int ret;
-	unsigned long flags;
-
-	if (!udev->usbdev) {
-		pr_err("invalid device\n");
-		return -ENODEV;
-	}
-
-	r = get_rx_struct(rx, &no_spc);
-	if (!r) {
-		pr_err("Out of Memory\n");
-		return -ENOMEM;
-	}
-
-	udev->rx_cb = cb;
-	r->callback = cb;
-	r->cb_data = cb_data;
-	r->index = (void *)udev;
-	r->rx = rx;
-
-	usb_fill_bulk_urb(r->urb,
-			  usbdev,
-			  usb_rcvbulkpipe(usbdev, 0x83),
-			  r->buf,
-			  RX_BUF_SIZE,
-			  gdm_usb_rcv_complete,
-			  r);
-
-	spin_lock_irqsave(&rx->submit_lock, flags);
-	list_add_tail(&r->rx_submit_list, &rx->rx_submit_list);
-	spin_unlock_irqrestore(&rx->submit_lock, flags);
-
-	if (context == KERNEL_THREAD)
-		ret = usb_submit_urb(r->urb, GFP_KERNEL);
-	else
-		ret = usb_submit_urb(r->urb, GFP_ATOMIC);
-
-	if (ret) {
-		spin_lock_irqsave(&rx->submit_lock, flags);
-		list_del(&r->rx_submit_list);
-		spin_unlock_irqrestore(&rx->submit_lock, flags);
-
-		pr_err("usb_submit_urb failed (%p)\n", r);
-		put_rx_struct(rx, r);
-	}
-
-	return ret;
-}
-
-static void gdm_usb_send_complete(struct urb *urb)
-{
-	struct usb_tx *t = urb->context;
-	struct tx_cxt *tx = t->tx;
-	struct lte_udev *udev = container_of(tx, struct lte_udev, tx);
-	unsigned long flags;
-
-	if (urb->status == -ECONNRESET) {
-		dev_info(&urb->dev->dev, "CONNRESET\n");
-		return;
-	}
-
-	if (t->callback)
-		t->callback(t->cb_data);
-
-	free_tx_struct(t);
-
-	spin_lock_irqsave(&tx->lock, flags);
-	udev->send_complete = 1;
-	schedule_work(&udev->work_tx.work);
-	spin_unlock_irqrestore(&tx->lock, flags);
-}
-
-static int send_tx_packet(struct usb_device *usbdev, struct usb_tx *t, u32 len)
-{
-	int ret = 0;
-
-	if (!(len % 512))
-		len++;
-
-	usb_fill_bulk_urb(t->urb,
-			  usbdev,
-			  usb_sndbulkpipe(usbdev, 2),
-			  t->buf,
-			  len,
-			  gdm_usb_send_complete,
-			  t);
-
-	ret = usb_submit_urb(t->urb, GFP_ATOMIC);
-
-	if (ret)
-		dev_err(&usbdev->dev, "usb_submit_urb failed: %d\n",
-			ret);
-
-	usb_mark_last_busy(usbdev);
-
-	return ret;
-}
-
-static u32 packet_aggregation(struct lte_udev *udev, u8 *send_buf)
-{
-	struct tx_cxt *tx = &udev->tx;
-	struct usb_tx_sdu *t_sdu = NULL;
-	struct multi_sdu *multi_sdu = (struct multi_sdu *)send_buf;
-	u16 send_len = 0;
-	u16 num_packet = 0;
-	unsigned long flags;
-
-	multi_sdu->cmd_evt = gdm_cpu_to_dev16(udev->gdm_ed, LTE_TX_MULTI_SDU);
-
-	while (num_packet < MAX_PACKET_IN_MULTI_SDU) {
-		spin_lock_irqsave(&tx->lock, flags);
-		if (list_empty(&tx->sdu_list)) {
-			spin_unlock_irqrestore(&tx->lock, flags);
-			break;
-		}
-
-		t_sdu = list_entry(tx->sdu_list.next, struct usb_tx_sdu, list);
-		if (send_len + t_sdu->len > MAX_SDU_SIZE) {
-			spin_unlock_irqrestore(&tx->lock, flags);
-			break;
-		}
-
-		list_del(&t_sdu->list);
-		spin_unlock_irqrestore(&tx->lock, flags);
-
-		memcpy(multi_sdu->data + send_len, t_sdu->buf, t_sdu->len);
-
-		send_len += (t_sdu->len + 3) & 0xfffc;
-		num_packet++;
-
-		if (tx->avail_count > 10)
-			t_sdu->callback(t_sdu->cb_data);
-
-		spin_lock_irqsave(&tx->lock, flags);
-		put_tx_struct(tx, t_sdu);
-		spin_unlock_irqrestore(&tx->lock, flags);
-	}
-
-	multi_sdu->len = gdm_cpu_to_dev16(udev->gdm_ed, send_len);
-	multi_sdu->num_packet = gdm_cpu_to_dev16(udev->gdm_ed, num_packet);
-
-	return send_len + offsetof(struct multi_sdu, data);
-}
-
-static void do_tx(struct work_struct *work)
-{
-	struct lte_udev *udev =
-		container_of(work, struct lte_udev, work_tx.work);
-	struct usb_device *usbdev = udev->usbdev;
-	struct tx_cxt *tx = &udev->tx;
-	struct usb_tx *t = NULL;
-	int is_send = 0;
-	u32 len = 0;
-	unsigned long flags;
-
-	if (!usb_autopm_get_interface(udev->intf))
-		usb_autopm_put_interface(udev->intf);
-
-	if (udev->usb_state == PM_SUSPEND)
-		return;
-
-	spin_lock_irqsave(&tx->lock, flags);
-	if (!udev->send_complete) {
-		spin_unlock_irqrestore(&tx->lock, flags);
-		return;
-	}
-	udev->send_complete = 0;
-
-	if (!list_empty(&tx->hci_list)) {
-		t = list_entry(tx->hci_list.next, struct usb_tx, list);
-		list_del(&t->list);
-		len = t->len;
-		t->is_sdu = 0;
-		is_send = 1;
-	} else if (!list_empty(&tx->sdu_list)) {
-		if (udev->tx_stop) {
-			udev->send_complete = 1;
-			spin_unlock_irqrestore(&tx->lock, flags);
-			return;
-		}
-
-		t = alloc_tx_struct(TX_BUF_SIZE);
-		if (!t) {
-			spin_unlock_irqrestore(&tx->lock, flags);
-			return;
-		}
-		t->callback = NULL;
-		t->tx = tx;
-		t->is_sdu = 1;
-		is_send = 1;
-	}
-
-	if (!is_send) {
-		udev->send_complete = 1;
-		spin_unlock_irqrestore(&tx->lock, flags);
-		return;
-	}
-	spin_unlock_irqrestore(&tx->lock, flags);
-
-	if (t->is_sdu)
-		len = packet_aggregation(udev, t->buf);
-
-	if (send_tx_packet(usbdev, t, len)) {
-		pr_err("send_tx_packet failed\n");
-		t->callback = NULL;
-		gdm_usb_send_complete(t->urb);
-	}
-}
-
-#define SDU_PARAM_LEN 12
-static int gdm_usb_sdu_send(void *priv_dev, void *data, int len,
-			    unsigned int dft_eps_ID, unsigned int eps_ID,
-			    void (*cb)(void *data), void *cb_data,
-			    int dev_idx, int nic_type)
-{
-	struct lte_udev *udev = priv_dev;
-	struct tx_cxt *tx = &udev->tx;
-	struct usb_tx_sdu *t_sdu;
-	struct sdu *sdu = NULL;
-	unsigned long flags;
-	int no_spc = 0;
-	u16 send_len;
-
-	if (!udev->usbdev) {
-		pr_err("sdu send - invalid device\n");
-		return TX_NO_DEV;
-	}
-
-	spin_lock_irqsave(&tx->lock, flags);
-	t_sdu = get_tx_sdu_struct(tx, &no_spc);
-	spin_unlock_irqrestore(&tx->lock, flags);
-
-	if (!t_sdu) {
-		pr_err("sdu send - free list empty\n");
-		return TX_NO_SPC;
-	}
-
-	sdu = (struct sdu *)t_sdu->buf;
-	sdu->cmd_evt = gdm_cpu_to_dev16(udev->gdm_ed, LTE_TX_SDU);
-	if (nic_type == NIC_TYPE_ARP) {
-		send_len = len + SDU_PARAM_LEN;
-		memcpy(sdu->data, data, len);
-	} else {
-		send_len = len - ETH_HLEN;
-		send_len += SDU_PARAM_LEN;
-		memcpy(sdu->data, data + ETH_HLEN, len - ETH_HLEN);
-	}
-
-	sdu->len = gdm_cpu_to_dev16(udev->gdm_ed, send_len);
-	sdu->dft_eps_ID = gdm_cpu_to_dev32(udev->gdm_ed, dft_eps_ID);
-	sdu->bearer_ID = gdm_cpu_to_dev32(udev->gdm_ed, eps_ID);
-	sdu->nic_type = gdm_cpu_to_dev32(udev->gdm_ed, nic_type);
-
-	t_sdu->len = send_len + HCI_HEADER_SIZE;
-	t_sdu->callback = cb;
-	t_sdu->cb_data = cb_data;
-
-	spin_lock_irqsave(&tx->lock, flags);
-	list_add_tail(&t_sdu->list, &tx->sdu_list);
-	schedule_work(&udev->work_tx.work);
-	spin_unlock_irqrestore(&tx->lock, flags);
-
-	if (no_spc)
-		return TX_NO_BUFFER;
-
-	return 0;
-}
-
-static int gdm_usb_hci_send(void *priv_dev, void *data, int len,
-			    void (*cb)(void *data), void *cb_data)
-{
-	struct lte_udev *udev = priv_dev;
-	struct tx_cxt *tx = &udev->tx;
-	struct usb_tx *t;
-	unsigned long flags;
-
-	if (!udev->usbdev) {
-		pr_err("hci send - invalid device\n");
-		return -ENODEV;
-	}
-
-	t = alloc_tx_struct(len);
-	if (!t) {
-		pr_err("hci_send - out of memory\n");
-		return -ENOMEM;
-	}
-
-	memcpy(t->buf, data, len);
-	t->callback = cb;
-	t->cb_data = cb_data;
-	t->len = len;
-	t->tx = tx;
-	t->is_sdu = 0;
-
-	spin_lock_irqsave(&tx->lock, flags);
-	list_add_tail(&t->list, &tx->hci_list);
-	schedule_work(&udev->work_tx.work);
-	spin_unlock_irqrestore(&tx->lock, flags);
-
-	return 0;
-}
-
-static u8 gdm_usb_get_endian(void *priv_dev)
-{
-	struct lte_udev *udev = priv_dev;
-
-	return udev->gdm_ed;
-}
-
-static int gdm_usb_probe(struct usb_interface *intf,
-			 const struct usb_device_id *id)
-{
-	int ret = 0;
-	struct phy_dev *phy_dev = NULL;
-	struct lte_udev *udev = NULL;
-	u16 idVendor, idProduct;
-	int bInterfaceNumber;
-	struct usb_device *usbdev = interface_to_usbdev(intf);
-
-	bInterfaceNumber = intf->cur_altsetting->desc.bInterfaceNumber;
-	idVendor = __le16_to_cpu(usbdev->descriptor.idVendor);
-	idProduct = __le16_to_cpu(usbdev->descriptor.idProduct);
-
-	pr_info("net vid = 0x%04x pid = 0x%04x\n", idVendor, idProduct);
-
-	if (bInterfaceNumber > NETWORK_INTERFACE) {
-		pr_info("not a network device\n");
-		return -ENODEV;
-	}
-
-	phy_dev = kzalloc(sizeof(*phy_dev), GFP_KERNEL);
-	if (!phy_dev)
-		return -ENOMEM;
-
-	udev = kzalloc(sizeof(*udev), GFP_KERNEL);
-	if (!udev) {
-		ret = -ENOMEM;
-		goto err_udev;
-	}
-
-	phy_dev->priv_dev = (void *)udev;
-	phy_dev->send_hci_func = gdm_usb_hci_send;
-	phy_dev->send_sdu_func = gdm_usb_sdu_send;
-	phy_dev->rcv_func = gdm_usb_recv;
-	phy_dev->get_endian = gdm_usb_get_endian;
-
-	udev->usbdev = usbdev;
-	ret = init_usb(udev);
-	if (ret < 0) {
-		dev_err(intf->usb_dev, "init_usb func failed\n");
-		goto err_init_usb;
-	}
-	udev->intf = intf;
-
-	intf->needs_remote_wakeup = 1;
-	usb_enable_autosuspend(usbdev);
-	pm_runtime_set_autosuspend_delay(&usbdev->dev, AUTO_SUSPEND_TIMER);
-
-	/* List up hosts with big endians, otherwise,
-	 * defaults to little endian
-	 */
-	if (idProduct == PID_GDM7243)
-		udev->gdm_ed = ENDIANNESS_BIG;
-	else
-		udev->gdm_ed = ENDIANNESS_LITTLE;
-
-	ret = request_mac_address(udev);
-	if (ret < 0) {
-		dev_err(intf->usb_dev, "request Mac address failed\n");
-		goto err_mac_address;
-	}
-
-	start_rx_proc(phy_dev);
-	usb_get_dev(usbdev);
-	usb_set_intfdata(intf, phy_dev);
-
-	return 0;
-
-err_mac_address:
-	release_usb(udev);
-err_init_usb:
-	kfree(udev);
-err_udev:
-	kfree(phy_dev);
-
-	return ret;
-}
-
-static void gdm_usb_disconnect(struct usb_interface *intf)
-{
-	struct phy_dev *phy_dev;
-	struct lte_udev *udev;
-	struct usb_device *usbdev;
-
-	usbdev = interface_to_usbdev(intf);
-	phy_dev = usb_get_intfdata(intf);
-
-	udev = phy_dev->priv_dev;
-	unregister_lte_device(phy_dev);
-
-	release_usb(udev);
-
-	kfree(udev);
-	udev = NULL;
-
-	kfree(phy_dev);
-	phy_dev = NULL;
-
-	usb_put_dev(usbdev);
-}
-
-static int gdm_usb_suspend(struct usb_interface *intf, pm_message_t pm_msg)
-{
-	struct phy_dev *phy_dev;
-	struct lte_udev *udev;
-	struct rx_cxt *rx;
-	struct usb_rx *r;
-	struct usb_rx *r_next;
-	unsigned long flags;
-
-	phy_dev = usb_get_intfdata(intf);
-	udev = phy_dev->priv_dev;
-	rx = &udev->rx;
-	if (udev->usb_state != PM_NORMAL) {
-		dev_err(intf->usb_dev, "usb suspend - invalid state\n");
-		return -EINVAL;
-	}
-
-	udev->usb_state = PM_SUSPEND;
-
-	spin_lock_irqsave(&rx->submit_lock, flags);
-	list_for_each_entry_safe(r, r_next, &rx->rx_submit_list,
-				 rx_submit_list) {
-		spin_unlock_irqrestore(&rx->submit_lock, flags);
-		usb_kill_urb(r->urb);
-		spin_lock_irqsave(&rx->submit_lock, flags);
-	}
-	spin_unlock_irqrestore(&rx->submit_lock, flags);
-
-	cancel_work_sync(&udev->work_tx.work);
-	cancel_work_sync(&udev->work_rx.work);
-
-	return 0;
-}
-
-static int gdm_usb_resume(struct usb_interface *intf)
-{
-	struct phy_dev *phy_dev;
-	struct lte_udev *udev;
-	struct tx_cxt *tx;
-	struct rx_cxt *rx;
-	unsigned long flags;
-	int issue_count;
-	int i;
-
-	phy_dev = usb_get_intfdata(intf);
-	udev = phy_dev->priv_dev;
-	rx = &udev->rx;
-
-	if (udev->usb_state != PM_SUSPEND) {
-		dev_err(intf->usb_dev, "usb resume - invalid state\n");
-		return -EINVAL;
-	}
-	udev->usb_state = PM_NORMAL;
-
-	spin_lock_irqsave(&rx->rx_lock, flags);
-	issue_count = rx->avail_count - MAX_RX_SUBMIT_COUNT;
-	spin_unlock_irqrestore(&rx->rx_lock, flags);
-
-	if (issue_count >= 0) {
-		for (i = 0; i < issue_count; i++)
-			gdm_usb_recv(phy_dev->priv_dev,
-				     udev->rx_cb,
-				     phy_dev,
-				     USB_COMPLETE);
-	}
-
-	tx = &udev->tx;
-	spin_lock_irqsave(&tx->lock, flags);
-	schedule_work(&udev->work_tx.work);
-	spin_unlock_irqrestore(&tx->lock, flags);
-
-	return 0;
-}
-
-static struct usb_driver gdm_usb_lte_driver = {
-	.name = "gdm_lte",
-	.probe = gdm_usb_probe,
-	.disconnect = gdm_usb_disconnect,
-	.id_table = id_table,
-	.supports_autosuspend = 1,
-	.suspend = gdm_usb_suspend,
-	.resume = gdm_usb_resume,
-	.reset_resume = gdm_usb_resume,
-};
-
-static int __init gdm_usb_lte_init(void)
-{
-	int ret = gdm_lte_event_init();
-
-	if (ret < 0) {
-		pr_err("error creating event\n");
-		return ret;
-	}
-
-	return usb_register(&gdm_usb_lte_driver);
-}
-
-static void __exit gdm_usb_lte_exit(void)
-{
-	gdm_lte_event_exit();
-
-	usb_deregister(&gdm_usb_lte_driver);
-}
-
-module_init(gdm_usb_lte_init);
-module_exit(gdm_usb_lte_exit);
-
-MODULE_VERSION(DRIVER_VERSION);
-MODULE_DESCRIPTION("GCT LTE USB Device Driver");
-MODULE_LICENSE("GPL");
diff --git a/drivers/staging/gdm724x/gdm_usb.h b/drivers/staging/gdm724x/gdm_usb.h
deleted file mode 100644
index db689b091c4f..000000000000
--- a/drivers/staging/gdm724x/gdm_usb.h
+++ /dev/null
@@ -1,99 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#ifndef _GDM_USB_H_
-#define _GDM_USB_H_
-
-#include <linux/types.h>
-#include <linux/usb.h>
-#include <linux/list.h>
-#include <linux/time.h>
-
-#include "gdm_endian.h"
-#include "hci_packet.h"
-
-#define PM_NORMAL 0
-#define PM_SUSPEND 1
-#define AUTO_SUSPEND_TIMER 5000 /* ms */
-
-#define RX_BUF_SIZE		(1024 * 32)
-#define TX_BUF_SIZE		(1024 * 32)
-#define SDU_BUF_SIZE	2048
-#define MAX_SDU_SIZE	(1024 * 30)
-#define MAX_PACKET_IN_MULTI_SDU	256
-
-#define VID_GCT			0x1076
-#define PID_GDM7240		0x8000
-#define PID_GDM7243		0x9000
-
-#define NETWORK_INTERFACE 1
-#define USB_SC_SCSI 0x06
-#define USB_PR_BULK 0x50
-
-#define MAX_NUM_SDU_BUF	64
-
-struct usb_tx {
-	struct list_head list;
-	struct urb *urb;
-	u8 *buf;
-	u32 len;
-	void (*callback)(void *cb_data);
-	void *cb_data;
-	struct tx_cxt *tx;
-	u8 is_sdu;
-};
-
-struct usb_tx_sdu {
-	struct list_head list;
-	u8 *buf;
-	u32 len;
-	void (*callback)(void *cb_data);
-	void *cb_data;
-};
-
-struct usb_rx {
-	struct list_head to_host_list;
-	struct list_head free_list;
-	struct list_head rx_submit_list;
-	struct rx_cxt	*rx;
-	struct urb *urb;
-	u8 *buf;
-	int (*callback)(void *cb_data, void *data, int len, int context);
-	void *cb_data;
-	void *index;
-};
-
-struct tx_cxt {
-	struct list_head sdu_list;
-	struct list_head hci_list;
-	struct list_head free_list;
-	u32 avail_count;
-	spinlock_t lock;
-};
-
-struct rx_cxt {
-	struct list_head to_host_list;
-	struct list_head rx_submit_list;
-	struct list_head free_list;
-	u32	avail_count;
-	spinlock_t to_host_lock;
-	spinlock_t rx_lock;
-	spinlock_t submit_lock;
-};
-
-struct lte_udev {
-	struct usb_device *usbdev;
-	struct tx_cxt tx;
-	struct rx_cxt rx;
-	struct delayed_work work_tx;
-	struct delayed_work work_rx;
-	u8 gdm_ed;
-	u8 send_complete;
-	u8 tx_stop;
-	struct usb_interface *intf;
-	int (*rx_cb)(void *cb_data, void *data, int len, int context);
-	int usb_state;
-	u8 request_mac_addr;
-};
-
-#endif /* _GDM_USB_H_ */
diff --git a/drivers/staging/gdm724x/hci.h b/drivers/staging/gdm724x/hci.h
deleted file mode 100644
index b30945daf3a5..000000000000
--- a/drivers/staging/gdm724x/hci.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#ifndef _HCI_H_
-#define _HCI_H_
-
-#define LTE_GET_INFORMATION		0x3002
-#define LTE_GET_INFORMATION_RESULT	0xB003
-	#define MAC_ADDRESS		0xA2
-
-#define LTE_LINK_ON_OFF_INDICATION	0xB133
-#define LTE_PDN_TABLE_IND		0xB143
-
-#define LTE_TX_SDU			0x3200
-#define LTE_RX_SDU			0xB201
-#define LTE_TX_MULTI_SDU		0x3202
-#define LTE_RX_MULTI_SDU		0xB203
-
-#define LTE_DL_SDU_FLOW_CONTROL		0x3305
-#define LTE_UL_SDU_FLOW_CONTROL		0xB306
-
-#define LTE_AT_CMD_TO_DEVICE		0x3307
-#define LTE_AT_CMD_FROM_DEVICE		0xB308
-
-#define LTE_SDIO_DM_SEND_PKT		0x3312
-#define LTE_SDIO_DM_RECV_PKT		0xB313
-
-#define LTE_NV_RESTORE_REQUEST		0xB30C
-#define LTE_NV_RESTORE_RESPONSE		0x330D
-#define LTE_NV_SAVE_REQUEST		0xB30E
-	#define NV_TYPE_LTE_INFO	0x00
-	#define NV_TYPE_BOARD_CONFIG	0x01
-	#define NV_TYPE_RF_CAL		0x02
-	#define NV_TYPE_TEMP		0x03
-	#define NV_TYPE_NET_INFO	0x04
-	#define NV_TYPE_SAFETY_INFO	0x05
-	#define NV_TYPE_CDMA_CAL	0x06
-	#define NV_TYPE_VENDOR		0x07
-	#define NV_TYPE_ALL		0xff
-#define LTE_NV_SAVE_RESPONSE		0x330F
-
-#define LTE_AT_CMD_TO_DEVICE_EXT	0x3323
-#define LTE_AT_CMD_FROM_DEVICE_EXT	0xB324
-
-#endif /* _HCI_H_ */
diff --git a/drivers/staging/gdm724x/hci_packet.h b/drivers/staging/gdm724x/hci_packet.h
deleted file mode 100644
index 3bb01e94f3b5..000000000000
--- a/drivers/staging/gdm724x/hci_packet.h
+++ /dev/null
@@ -1,82 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#ifndef _HCI_PACKET_H_
-#define _HCI_PACKET_H_
-
-#define HCI_HEADER_SIZE 4
-
-/*
- * The NIC type definition:
- * For backward compatibility, lower 16 bits used as they were.
- * Lower 16 bit: NIC_TYPE values
- * Uppoer 16 bit: NIC_TYPE Flags
- */
-#define NIC_TYPE_NIC0		0x00000010
-#define NIC_TYPE_NIC1		0x00000011
-#define NIC_TYPE_NIC2		0x00000012
-#define NIC_TYPE_NIC3		0x00000013
-#define NIC_TYPE_ARP		0x00000100
-#define NIC_TYPE_ICMPV6		0x00000200
-#define NIC_TYPE_MASK		0x0000FFFF
-#define NIC_TYPE_F_IPV4		0x00010000
-#define NIC_TYPE_F_IPV6		0x00020000
-#define NIC_TYPE_F_DHCP		0x00040000
-#define NIC_TYPE_F_NDP		0x00080000
-#define NIC_TYPE_F_VLAN		0x00100000
-
-struct hci_packet {
-	__dev16 cmd_evt;
-	__dev16 len;
-	u8 data[];
-} __packed;
-
-struct tlv {
-	u8 type;
-	u8 len;
-	u8 *data[];
-} __packed;
-
-struct sdu_header {
-	__dev16 cmd_evt;
-	__dev16 len;
-	__dev32 dft_eps_id;
-	__dev32 bearer_ID;
-	__dev32 nic_type;
-} __packed;
-
-struct sdu {
-	__dev16 cmd_evt;
-	__dev16 len;
-	__dev32 dft_eps_ID;
-	__dev32 bearer_ID;
-	__dev32 nic_type;
-	u8 data[];
-} __packed;
-
-struct multi_sdu {
-	__dev16 cmd_evt;
-	__dev16 len;
-	__dev16 num_packet;
-	__dev16 reserved;
-	u8 data[];
-} __packed;
-
-struct hci_pdn_table_ind {
-	__dev16 cmd_evt;
-	__dev16 len;
-	u8 activate;
-	__dev32 dft_eps_id;
-	__dev32 nic_type;
-	u8 pdn_type;
-	u8 ipv4_addr[4];
-	u8 ipv6_intf_id[8];
-} __packed;
-
-struct hci_connect_ind {
-	__dev16 cmd_evt;
-	__dev16 len;
-	__dev32 connect;
-} __packed;
-
-#endif /* _HCI_PACKET_H_ */
diff --git a/drivers/staging/gdm724x/netlink_k.c b/drivers/staging/gdm724x/netlink_k.c
deleted file mode 100644
index 8f39cc5617aa..000000000000
--- a/drivers/staging/gdm724x/netlink_k.c
+++ /dev/null
@@ -1,128 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/export.h>
-#include <linux/mutex.h>
-#include <linux/etherdevice.h>
-#include <linux/netlink.h>
-#include <asm/byteorder.h>
-#include <net/sock.h>
-
-#include "netlink_k.h"
-
-static DEFINE_MUTEX(netlink_mutex);
-
-#define ND_MAX_GROUP		30
-#define ND_IFINDEX_LEN		sizeof(int)
-#define ND_NLMSG_SPACE(len)	(NLMSG_SPACE(len) + ND_IFINDEX_LEN)
-#define ND_NLMSG_DATA(nlh)	((void *)((char *)NLMSG_DATA(nlh) + \
-						  ND_IFINDEX_LEN))
-#define ND_NLMSG_S_LEN(len)	((len) + ND_IFINDEX_LEN)
-#define ND_NLMSG_R_LEN(nlh)	((nlh)->nlmsg_len - ND_IFINDEX_LEN)
-#define ND_NLMSG_IFIDX(nlh)	NLMSG_DATA(nlh)
-#define ND_MAX_MSG_LEN		(1024 * 32)
-
-static void (*rcv_cb)(struct net_device *dev, u16 type, void *msg, int len);
-
-static void netlink_rcv_cb(struct sk_buff *skb)
-{
-	struct nlmsghdr	*nlh;
-	struct net_device *dev;
-	u32 mlen;
-	void *msg;
-	int ifindex;
-
-	if (!rcv_cb) {
-		pr_err("nl cb - unregistered\n");
-		return;
-	}
-
-	if (skb->len < NLMSG_HDRLEN) {
-		pr_err("nl cb - invalid skb length\n");
-		return;
-	}
-
-	nlh = (struct nlmsghdr *)skb->data;
-
-	if (skb->len < nlh->nlmsg_len || nlh->nlmsg_len > ND_MAX_MSG_LEN) {
-		pr_err("nl cb - invalid length (%d,%d)\n",
-		       skb->len, nlh->nlmsg_len);
-		return;
-	}
-
-	memcpy(&ifindex, ND_NLMSG_IFIDX(nlh), ND_IFINDEX_LEN);
-	msg = ND_NLMSG_DATA(nlh);
-	mlen = ND_NLMSG_R_LEN(nlh);
-
-	dev = dev_get_by_index(&init_net, ifindex);
-	if (dev) {
-		rcv_cb(dev, nlh->nlmsg_type, msg, mlen);
-		dev_put(dev);
-	} else {
-		pr_err("nl cb - dev (%d) not found\n", ifindex);
-	}
-}
-
-static void netlink_rcv(struct sk_buff *skb)
-{
-	mutex_lock(&netlink_mutex);
-	netlink_rcv_cb(skb);
-	mutex_unlock(&netlink_mutex);
-}
-
-struct sock *netlink_init(int unit,
-			  void (*cb)(struct net_device *dev, u16 type,
-				     void *msg, int len))
-{
-	struct sock *sock;
-	struct netlink_kernel_cfg cfg = {
-		.input  = netlink_rcv,
-	};
-
-	sock = netlink_kernel_create(&init_net, unit, &cfg);
-
-	if (sock)
-		rcv_cb = cb;
-
-	return sock;
-}
-
-int netlink_send(struct sock *sock, int group, u16 type, void *msg, int len,
-		 struct net_device *dev)
-{
-	static u32 seq;
-	struct sk_buff *skb = NULL;
-	struct nlmsghdr *nlh;
-	int ret = 0;
-
-	if (group > ND_MAX_GROUP)
-		return -EINVAL;
-
-	if (!netlink_has_listeners(sock, group + 1))
-		return -ESRCH;
-
-	skb = alloc_skb(NLMSG_SPACE(len), GFP_ATOMIC);
-	if (!skb)
-		return -ENOMEM;
-
-	seq++;
-
-	nlh = nlmsg_put(skb, 0, seq, type, len, 0);
-	memcpy(NLMSG_DATA(nlh), msg, len);
-	NETLINK_CB(skb).portid = 0;
-	NETLINK_CB(skb).dst_group = 0;
-
-	ret = netlink_broadcast(sock, skb, 0, group + 1, GFP_ATOMIC);
-	if (!ret)
-		return len;
-
-	if (ret != -ESRCH)
-		netdev_err(dev, "nl broadcast g=%d, t=%d, l=%d, r=%d\n",
-			   group, type, len, ret);
-	else if (netlink_has_listeners(sock, group + 1))
-		return -EAGAIN;
-
-	return ret;
-}
diff --git a/drivers/staging/gdm724x/netlink_k.h b/drivers/staging/gdm724x/netlink_k.h
deleted file mode 100644
index d42eea9bea3e..000000000000
--- a/drivers/staging/gdm724x/netlink_k.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
-
-#ifndef _NETLINK_K_H
-#define _NETLINK_K_H
-
-#include <linux/netdevice.h>
-#include <net/sock.h>
-
-struct sock *netlink_init(int unit,
-			  void (*cb)(struct net_device *dev,
-				     u16 type, void *msg, int len));
-int netlink_send(struct sock *sock, int group, u16 type, void *msg, int len,
-		 struct net_device *dev);
-
-#endif /* _NETLINK_K_H_ */
-- 
2.43.0