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// 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[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_index(u16 packetType)
{
int i;
for (i = 0; i < TTY_MAX_COUNT; i++) {
if (packet_type[i] == packetType)
return i;
}
return -1;
}
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_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[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 -1;
}
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 -1;
}
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");
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