// 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 ACM_CTRL_DTR 0x01
|
#define ACM_CTRL_RTS 0x02
|
#define ACM_CTRL_DSR 0x02
|
#define ACM_CTRL_RI 0x08
|
#define ACM_CTRL_DCD 0x01
|
|
#define WRITE_SIZE 2048
|
|
#define MUX_TX_MAX_SIZE 2048
|
|
#define GDM_TTY_READY(gdm) (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 int gdm_tty_write(struct tty_struct *tty, const unsigned char *buf,
|
int len)
|
{
|
struct gdm *gdm = tty->driver_data;
|
int remain = len;
|
int sent_len = 0;
|
int sending_len = 0;
|
|
if (!GDM_TTY_READY(gdm))
|
return -ENODEV;
|
|
if (!len)
|
return 0;
|
|
while (1) {
|
sending_len = min(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;
|
if (remain <= 0)
|
break;
|
}
|
|
return len;
|
}
|
|
static int gdm_tty_write_room(struct tty_struct *tty)
|
{
|
struct gdm *gdm = tty->driver_data;
|
|
if (!GDM_TTY_READY(gdm))
|
return -ENODEV;
|
|
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 = alloc_tty_driver(GDM_TTY_MINOR);
|
if (!tty_driver)
|
return -ENOMEM;
|
|
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->flags = TTY_DRIVER_REAL_RAW |
|
TTY_DRIVER_DYNAMIC_DEV;
|
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) {
|
put_tty_driver(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);
|
put_tty_driver(tty_driver);
|
}
|
}
|
}
|
