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/*
* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/version.h>
#include <linux/kernel.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/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_send(n, d, l, i, c, b) (\
n->tty_dev->send_func(n->tty_dev->priv_dev, d, l, i, c, b))
#define gdm_tty_recv(n, c) (\
n->tty_dev->recv_func(n->tty_dev->priv_dev, c))
#define gdm_tty_send_control(n, r, v, d, l) (\
n->tty_dev->send_control(n->tty_dev->priv_dev, r, v, d, l))
#define acm_set_comm_feature(n, v) \
gdm_tty_send_control(n, 0x02, v, NULL, 0)
#define GDM_TTY_READY(tty_str) (tty_str && tty_str->tty_dev && tty_str->port.count)
struct tty_driver *g_tty_drv[TTY_MAX_COUNT] = {NULL, };
struct tty_str *g_tty_str[TTY_MAX_COUNT][GDM_TTY_MINOR] = {{NULL, }, };
static char *DRIVER_STRING[TTY_MAX_COUNT] = {"GCTATC", "GCTDM"};
static char *DEVICE_STRING[TTY_MAX_COUNT] = {"GCT-ATC", "GCT-DM"};
static DEFINE_MUTEX(open_mutex);
static struct tty_port_operations gdm_tty_port_ops = {
};
static int gdm_tty_open(struct tty_struct *tty, struct file *filp)
{
struct tty_str *tty_str = NULL;
int i;
int ret = 0;
mutex_lock(&open_mutex);
for (i = 0; i < TTY_MAX_COUNT; i++) {
if (!strcmp(tty->driver->driver_name, DRIVER_STRING[i])) {
tty_str = g_tty_str[i][tty->index];
break;
}
}
if (!tty_str) {
printk(KERN_INFO "glte: no tty device\n");
mutex_unlock(&open_mutex);
return -ENODEV;
}
set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
tty->driver_data = tty_str;
tty_port_tty_set(&tty_str->port, tty);
tty_str->port.count++;
set_bit(ASYNCB_INITIALIZED, &tty_str->port.flags);
ret = tty_port_block_til_ready(&tty_str->port, tty, filp);
mutex_unlock(&open_mutex);
return ret;
}
static void gdm_tty_close(struct tty_struct *tty, struct file *filp)
{
struct tty_str *tty_str = tty->driver_data;
int i;
if (!tty_str) {
printk(KERN_INFO "glte: tty device already close\n");
return;
}
if (tty_str->port.count != 0) {
tty_port_close_start(&tty_str->port, tty, filp);
tty_port_close_end(&tty_str->port, tty);
if (tty_str->port.count == 0)
tty_port_tty_set(&tty_str->port, NULL);
tty_str->port.tty = NULL;
}
if (!tty_str->tty_dev) {
for (i = 0; i < TTY_MAX_COUNT; i++) {
if (!strcmp(tty->driver->driver_name, DRIVER_STRING[i]))
break;
}
if (i < TTY_MAX_COUNT) {
tty_unregister_device(g_tty_drv[i], tty->index);
tty_port_tty_set(&tty_str->port, NULL);
kfree(tty_str);
g_tty_str[i][tty->index] = NULL;
}
}
}
static int gdm_tty_recv_complete(void *data, int len, int index, int minor, int complete)
{
struct tty_str *tty_str = g_tty_str[index][minor];
struct tty_port *tty_port;
if (!GDM_TTY_READY(tty_str)) {
if (complete == RECV_PACKET_PROCESS_COMPLETE)
gdm_tty_recv(tty_str, gdm_tty_recv_complete);
return TO_HOST_PORT_CLOSE;
}
if (!data || !len)
goto complete_routine;
tty_port = &tty_str->port;
if (tty_buffer_request_room(tty_port, len) == len) {
tty_insert_flip_string(tty_port, data, len);
tty_flip_buffer_push(tty_port);
} else {
return TO_HOST_BUFFER_REQUEST_FAIL;
}
complete_routine:
if (complete == RECV_PACKET_PROCESS_COMPLETE)
gdm_tty_recv(tty_str, gdm_tty_recv_complete);
return TO_HOST_SUCCESS;
}
static void gdm_tty_send_complete(void *arg)
{
struct tty_str *tty_str = (struct tty_str *)arg;
struct tty_struct *tty;
if (!GDM_TTY_READY(tty_str))
return;
tty = tty_port_tty_get(&tty_str->port);
tty_wakeup(tty);
tty_kref_put(tty);
}
static int gdm_tty_write(struct tty_struct *tty, const unsigned char *buf, int len)
{
struct tty_str *tty_str = tty->driver_data;
int remain = len;
int sent_len = 0;
int sending_len = 0;
if (!GDM_TTY_READY(tty_str))
return -ENODEV;
if (!len)
return 0;
while (1) {
sending_len = remain > MUX_TX_MAX_SIZE ? MUX_TX_MAX_SIZE : remain;
gdm_tty_send(tty_str,
(void *)(buf+sent_len),
sending_len,
tty_str->tty_drv_index,
gdm_tty_send_complete,
tty_str
);
sent_len += sending_len;
remain -= sending_len;
if (remain <= 0)
break;
}
return len;
}
static int gdm_tty_write_room(struct tty_struct *tty)
{
struct tty_str *tty_str = tty->driver_data;
if (!GDM_TTY_READY(tty_str))
return -ENODEV;
return WRITE_SIZE;
}
static int gdm_tty_tiocmget(struct tty_struct *tty)
{
struct tty_str *tty_str = tty->driver_data;
if (!GDM_TTY_READY(tty_str))
return -ENODEV;
return (0 & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
(0 & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
(0 & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
(0 & ACM_CTRL_RI ? TIOCM_RI : 0) |
(0 & ACM_CTRL_DCD ? TIOCM_CD : 0) |
TIOCM_CTS;
}
static int gdm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
{
struct tty_str *tty_str = tty->driver_data;
if (!GDM_TTY_READY(tty_str))
return -ENODEV;
return 1;
}
int register_lte_tty_device(struct tty_dev *tty_dev, struct device *dev)
{
struct tty_str *tty_str;
int i, j;
for (i = 0; i < TTY_MAX_COUNT; i++) {
for (j = 0; j < GDM_TTY_MINOR; j++) {
if (!g_tty_str[i][j])
break;
}
if (j == GDM_TTY_MINOR) {
tty_dev->minor[i] = j;
return -1;
}
tty_str = kmalloc(sizeof(struct tty_str), GFP_KERNEL);
if (!tty_str)
return -ENOMEM;
g_tty_str[i][j] = tty_str;
tty_str->tty_dev = tty_dev;
tty_str->tty_drv_index = i;
tty_dev->minor[i] = j;
tty_port_init(&tty_str->port);
tty_str->port.ops = &gdm_tty_port_ops;
if (strcmp(DEVICE_STRING[i], "GCT-ATC") != 0)
dev = NULL;
tty_register_device(g_tty_drv[i], j, dev);
}
acm_set_comm_feature(tty_str, 1);
for (i = 0; i < MAX_ISSUE_NUM; i++)
gdm_tty_recv(tty_str, gdm_tty_recv_complete);
return 0;
}
void unregister_lte_tty_device(struct tty_dev *tty_dev)
{
struct tty_str *tty_str;
int i;
for (i = 0; i < TTY_MAX_COUNT; i++) {
if (tty_dev->minor[i] >= GDM_TTY_MINOR)
continue;
tty_str = g_tty_str[i][tty_dev->minor[i]];
if (!tty_str)
continue;
tty_str->tty_dev = NULL;
if (!tty_str->port.count) {
tty_unregister_device(g_tty_drv[i], tty_dev->minor[i]);
tty_port_tty_set(&tty_str->port, NULL);
kfree(tty_str);
g_tty_str[i][tty_dev->minor[i]] = NULL;
}
}
}
static void gdm_tty_set_termios(struct tty_struct *tty, struct ktermios *termios_old)
{
return;
}
static const struct tty_operations gdm_tty_ops = {
.open = gdm_tty_open,
.close = gdm_tty_close,
.write = gdm_tty_write,
.write_room = gdm_tty_write_room,
.tiocmget = gdm_tty_tiocmget,
.tiocmset = gdm_tty_tiocmset,
.set_termios = gdm_tty_set_termios,
};
int register_lte_tty_driver(void)
{
struct tty_driver *tty_driver = NULL;
int i;
int ret;
for (i = 0; i < TTY_MAX_COUNT; i++) {
tty_driver = alloc_tty_driver(GDM_TTY_MINOR);
if (!tty_driver) {
printk(KERN_ERR "glte: alloc_tty_driver fail\n");
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);
g_tty_drv[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 = g_tty_drv[i];
if (tty_driver) {
tty_unregister_driver(tty_driver);
put_tty_driver(tty_driver);
}
}
}
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