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// SPDX-License-Identifier: GPL-2.0
/*
* IPWireless 3G PCMCIA Network Driver
*
* Original code
* by Stephen Blackheath <stephen@blacksapphire.com>,
* Ben Martel <benm@symmetric.co.nz>
*
* Copyrighted as follows:
* Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
*
* Various driver changes and rewrites, port to new kernels
* Copyright (C) 2006-2007 Jiri Kosina
*
* Misc code cleanups and updates
* Copyright (C) 2007 David Sterba
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/ppp_defs.h>
#include <linux/if.h>
#include <linux/ppp-ioctl.h>
#include <linux/sched.h>
#include <linux/serial.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/uaccess.h>
#include "tty.h"
#include "network.h"
#include "hardware.h"
#include "main.h"
#define IPWIRELESS_PCMCIA_START (0)
#define IPWIRELESS_PCMCIA_MINORS (24)
#define IPWIRELESS_PCMCIA_MINOR_RANGE (8)
#define TTYTYPE_MODEM (0)
#define TTYTYPE_MONITOR (1)
#define TTYTYPE_RAS_RAW (2)
struct ipw_tty {
struct tty_port port;
int index;
struct ipw_hardware *hardware;
unsigned int channel_idx;
unsigned int secondary_channel_idx;
int tty_type;
struct ipw_network *network;
unsigned int control_lines;
struct mutex ipw_tty_mutex;
int tx_bytes_queued;
int closing;
};
static struct ipw_tty *ttys[IPWIRELESS_PCMCIA_MINORS];
static struct tty_driver *ipw_tty_driver;
static char *tty_type_name(int tty_type)
{
static char *channel_names[] = {
"modem",
"monitor",
"RAS-raw"
};
return channel_names[tty_type];
}
static struct ipw_tty *get_tty(int index)
{
/*
* The 'ras_raw' channel is only available when 'loopback' mode
* is enabled.
* Number of minor starts with 16 (_RANGE * _RAS_RAW).
*/
if (!ipwireless_loopback && index >=
IPWIRELESS_PCMCIA_MINOR_RANGE * TTYTYPE_RAS_RAW)
return NULL;
return ttys[index];
}
static int ipw_open(struct tty_struct *linux_tty, struct file *filp)
{
struct ipw_tty *tty = get_tty(linux_tty->index);
if (!tty)
return -ENODEV;
mutex_lock(&tty->ipw_tty_mutex);
if (tty->port.count == 0)
tty->tx_bytes_queued = 0;
tty->port.count++;
tty->port.tty = linux_tty;
linux_tty->driver_data = tty;
tty->port.low_latency = 1;
if (tty->tty_type == TTYTYPE_MODEM)
ipwireless_ppp_open(tty->network);
mutex_unlock(&tty->ipw_tty_mutex);
return 0;
}
static void do_ipw_close(struct ipw_tty *tty)
{
tty->port.count--;
if (tty->port.count == 0) {
struct tty_struct *linux_tty = tty->port.tty;
if (linux_tty != NULL) {
tty->port.tty = NULL;
linux_tty->driver_data = NULL;
if (tty->tty_type == TTYTYPE_MODEM)
ipwireless_ppp_close(tty->network);
}
}
}
static void ipw_hangup(struct tty_struct *linux_tty)
{
struct ipw_tty *tty = linux_tty->driver_data;
if (!tty)
return;
mutex_lock(&tty->ipw_tty_mutex);
if (tty->port.count == 0) {
mutex_unlock(&tty->ipw_tty_mutex);
return;
}
do_ipw_close(tty);
mutex_unlock(&tty->ipw_tty_mutex);
}
static void ipw_close(struct tty_struct *linux_tty, struct file *filp)
{
ipw_hangup(linux_tty);
}
/* Take data received from hardware, and send it out the tty */
void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
unsigned int length)
{
int work = 0;
mutex_lock(&tty->ipw_tty_mutex);
if (!tty->port.count) {
mutex_unlock(&tty->ipw_tty_mutex);
return;
}
mutex_unlock(&tty->ipw_tty_mutex);
work = tty_insert_flip_string(&tty->port, data, length);
if (work != length)
printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
": %d chars not inserted to flip buffer!\n",
length - work);
if (work)
tty_flip_buffer_push(&tty->port);
}
static void ipw_write_packet_sent_callback(void *callback_data,
unsigned int packet_length)
{
struct ipw_tty *tty = callback_data;
/*
* Packet has been sent, so we subtract the number of bytes from our
* tally of outstanding TX bytes.
*/
tty->tx_bytes_queued -= packet_length;
}
static int ipw_write(struct tty_struct *linux_tty,
const unsigned char *buf, int count)
{
struct ipw_tty *tty = linux_tty->driver_data;
int room, ret;
if (!tty)
return -ENODEV;
mutex_lock(&tty->ipw_tty_mutex);
if (!tty->port.count) {
mutex_unlock(&tty->ipw_tty_mutex);
return -EINVAL;
}
room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
if (room < 0)
room = 0;
/* Don't allow caller to write any more than we have room for */
if (count > room)
count = room;
if (count == 0) {
mutex_unlock(&tty->ipw_tty_mutex);
return 0;
}
ret = ipwireless_send_packet(tty->hardware, IPW_CHANNEL_RAS,
buf, count,
ipw_write_packet_sent_callback, tty);
if (ret == -1) {
mutex_unlock(&tty->ipw_tty_mutex);
return 0;
}
tty->tx_bytes_queued += count;
mutex_unlock(&tty->ipw_tty_mutex);
return count;
}
static int ipw_write_room(struct tty_struct *linux_tty)
{
struct ipw_tty *tty = linux_tty->driver_data;
int room;
/* FIXME: Exactly how is the tty object locked here .. */
if (!tty)
return -ENODEV;
if (!tty->port.count)
return -EINVAL;
room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
if (room < 0)
room = 0;
return room;
}
static int ipwireless_get_serial_info(struct tty_struct *linux_tty,
struct serial_struct *ss)
{
struct ipw_tty *tty = linux_tty->driver_data;
if (!tty)
return -ENODEV;
if (!tty->port.count)
return -EINVAL;
ss->type = PORT_UNKNOWN;
ss->line = tty->index
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