[deliverable/linux.git] / drivers / tty / ipwireless / tty.c

/*
 * 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 ipw_tty *tty,
				      struct serial_struct __user *retinfo)
{
	struct serial_struct tmp;

	memset(&tmp, 0, sizeof(tmp));
	tmp.type = PORT_UNKNOWN;
	tmp.line = tty->index;
	tmp.baud_base = 115200;

	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
		return -EFAULT;

	return 0;
}

static int ipw_chars_in_buffer(struct tty_struct *linux_tty)
{
	struct ipw_tty *tty = linux_tty->driver_data;

	if (!tty)
		return 0;

	if (!tty->port.count)
		return 0;

	return tty->tx_bytes_queued;
}

static int get_control_lines(struct ipw_tty *tty)
{
	unsigned int my = tty->control_lines;
	unsigned int out = 0;

	if (my & IPW_CONTROL_LINE_RTS)
		out |= TIOCM_RTS;
	if (my & IPW_CONTROL_LINE_DTR)
		out |= TIOCM_DTR;
	if (my & IPW_CONTROL_LINE_CTS)
		out |= TIOCM_CTS;
	if (my & IPW_CONTROL_LINE_DSR)
		out |= TIOCM_DSR;
	if (my & IPW_CONTROL_LINE_DCD)
		out |= TIOCM_CD;

	return out;
}

static int set_control_lines(struct ipw_tty *tty, unsigned int set,
			     unsigned int clear)
{
	int ret;

	if (set & TIOCM_RTS) {
		ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 1);
		if (ret)
			return ret;
		if (tty->secondary_channel_idx != -1) {
			ret = ipwireless_set_RTS(tty->hardware,
					  tty->secondary_channel_idx, 1);
			if (ret)
				return ret;
		}
	}
	if (set & TIOCM_DTR) {
		ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 1);
		if (ret)
			return ret;
		if (tty->secondary_channel_idx != -1) {
			ret = ipwireless_set_DTR(tty->hardware,
					  tty->secondary_channel_idx, 1);
			if (ret)
				return ret;
		}
	}
	if (clear & TIOCM_RTS) {
		ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 0);
		if (tty->secondary_channel_idx != -1) {
			ret = ipwireless_set_RTS(tty->hardware,
					  tty->secondary_channel_idx, 0);
			if (ret)
				return ret;
		}
	}
	if (clear & TIOCM_DTR) {
		ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 0);
		if (tty->secondary_channel_idx != -1) {
			ret = ipwireless_set_DTR(tty->hardware,
					  tty->secondary_channel_idx, 0);
			if (ret)
				return ret;
		}
	}
	return 0;
}

static int ipw_tiocmget(struct tty_struct *linux_tty)
{
	struct ipw_tty *tty = linux_tty->driver_data;
	/* FIXME: Exactly how is the tty object locked here .. */

	if (!tty)
		return -ENODEV;

	if (!tty->port.count)
		return -EINVAL;

	return get_control_lines(tty);
}

static int
ipw_tiocmset(struct tty_struct *linux_tty,
	     unsigned int set, unsigned int clear)
{
	struct ipw_tty *tty = linux_tty->driver_data;
	/* FIXME: Exactly how is the tty object locked here .. */

	if (!tty)
		return -ENODEV;

	if (!tty->port.count)
		return -EINVAL;

	return set_control_lines(tty, set, clear);
}

static int ipw_ioctl(struct tty_struct *linux_tty,
		     unsigned int cmd, unsigned long arg)
{
	struct ipw_tty *tty = linux_tty->driver_data;

	if (!tty)
		return -ENODEV;

	if (!tty->port.count)
		return -EINVAL;

	/* FIXME: Exactly how is the tty object locked here .. */

	switch (cmd) {
	case TIOCGSERIAL:
		return ipwireless_get_serial_info(tty, (void __user *) arg);

	case TIOCSSERIAL:
		return 0;	/* Keeps the PCMCIA scripts happy. */
	}

	if (tty->tty_type == TTYTYPE_MODEM) {
		switch (cmd) {
		case PPPIOCGCHAN:
			{
				int chan = ipwireless_ppp_channel_index(
							tty->network);

				if (chan < 0)
					return -ENODEV;
				if (put_user(chan, (int __user *) arg))
					return -EFAULT;
			}
			return 0;

		case PPPIOCGUNIT:
			{
				int unit = ipwireless_ppp_unit_number(
						tty->network);

				if (unit < 0)
					return -ENODEV;
				if (put_user(unit, (int __user *) arg))
					return -EFAULT;
			}
			return 0;

		case FIONREAD:
			{
				int val = 0;

				if (put_user(val, (int __user *) arg))
					return -EFAULT;
			}
			return 0;
		case TCFLSH:
			return tty_perform_flush(linux_tty, arg);
		}
	}
	return -ENOIOCTLCMD;
}

static int add_tty(int j,
		    struct ipw_hardware *hardware,
		    struct ipw_network *network, int channel_idx,
		    int secondary_channel_idx, int tty_type)
{
	ttys[j] = kzalloc(sizeof(struct ipw_tty), GFP_KERNEL);
	if (!ttys[j])
		return -ENOMEM;
	ttys[j]->index = j;
	ttys[j]->hardware = hardware;
	ttys[j]->channel_idx = channel_idx;
	ttys[j]->secondary_channel_idx = secondary_channel_idx;
	ttys[j]->network = network;
	ttys[j]->tty_type = tty_type;
	mutex_init(&ttys[j]->ipw_tty_mutex);
	tty_port_init(&ttys[j]->port);

	tty_port_register_device(&ttys[j]->port, ipw_tty_driver, j, NULL);
	ipwireless_associate_network_tty(network, channel_idx, ttys[j]);

	if (secondary_channel_idx != -1)
		ipwireless_associate_network_tty(network,
						 secondary_channel_idx,
						 ttys[j]);
	/* check if we provide raw device (if loopback is enabled) */
	if (get_tty(j))
		printk(KERN_INFO IPWIRELESS_PCCARD_NAME
		       ": registering %s device ttyIPWp%d\n",
		       tty_type_name(tty_type), j);

	return 0;
}

struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hardware,
				      struct ipw_network *network)
{
	int i, j;

	for (i = 0; i < IPWIRELESS_PCMCIA_MINOR_RANGE; i++) {
		int allfree = 1;

		for (j = i; j < IPWIRELESS_PCMCIA_MINORS;
				j += IPWIRELESS_PCMCIA_MINOR_RANGE)
			if (ttys[j] != NULL) {
				allfree = 0;
				break;
			}

		if (allfree) {
			j = i;

			if (add_tty(j, hardware, network,
					IPW_CHANNEL_DIALLER, IPW_CHANNEL_RAS,
					TTYTYPE_MODEM))
				return NULL;

			j += IPWIRELESS_PCMCIA_MINOR_RANGE;
			if (add_tty(j, hardware, network,
					IPW_CHANNEL_DIALLER, -1,
					TTYTYPE_MONITOR))
				return NULL;

			j += IPWIRELESS_PCMCIA_MINOR_RANGE;
			if (add_tty(j, hardware, network,
					IPW_CHANNEL_RAS, -1,
					TTYTYPE_RAS_RAW))
				return NULL;

			return ttys[i];
		}
	}
	return NULL;
}

/*
 * Must be called before ipwireless_network_free().
 */
void ipwireless_tty_free(struct ipw_tty *tty)
{
	int j;
	struct ipw_network *network = ttys[tty->index]->network;

	for (j = tty->index; j < IPWIRELESS_PCMCIA_MINORS;
			j += IPWIRELESS_PCMCIA_MINOR_RANGE) {
		struct ipw_tty *ttyj = ttys[j];

		if (ttyj) {
			mutex_lock(&ttyj->ipw_tty_mutex);
			if (get_tty(j))
				printk(KERN_INFO IPWIRELESS_PCCARD_NAME
				       ": deregistering %s device ttyIPWp%d\n",
				       tty_type_name(ttyj->tty_type), j);
			ttyj->closing = 1;
			if (ttyj->port.tty != NULL) {
				mutex_unlock(&ttyj->ipw_tty_mutex);
				tty_vhangup(ttyj->port.tty);
				/* FIXME: Exactly how is the tty object locked here
				   against a parallel ioctl etc */
				/* FIXME2: hangup does not mean all processes
				 * are gone */
				mutex_lock(&ttyj->ipw_tty_mutex);
			}
			while (ttyj->port.count)
				do_ipw_close(ttyj);
			ipwireless_disassociate_network_ttys(network,
							     ttyj->channel_idx);
			tty_unregister_device(ipw_tty_driver, j);
			tty_port_destroy(&ttyj->port);
			ttys[j] = NULL;
			mutex_unlock(&ttyj->ipw_tty_mutex);
			kfree(ttyj);
		}
	}
}

static const struct tty_operations tty_ops = {
	.open = ipw_open,
	.close = ipw_close,
	.hangup = ipw_hangup,
	.write = ipw_write,
	.write_room = ipw_write_room,
	.ioctl = ipw_ioctl,
	.chars_in_buffer = ipw_chars_in_buffer,
	.tiocmget = ipw_tiocmget,
	.tiocmset = ipw_tiocmset,
};

int ipwireless_tty_init(void)
{
	int result;

	ipw_tty_driver = alloc_tty_driver(IPWIRELESS_PCMCIA_MINORS);
	if (!ipw_tty_driver)
		return -ENOMEM;

	ipw_tty_driver->driver_name = IPWIRELESS_PCCARD_NAME;
	ipw_tty_driver->name = "ttyIPWp";
	ipw_tty_driver->major = 0;
	ipw_tty_driver->minor_start = IPWIRELESS_PCMCIA_START;
	ipw_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
	ipw_tty_driver->subtype = SERIAL_TYPE_NORMAL;
	ipw_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
	ipw_tty_driver->init_termios = tty_std_termios;
	ipw_tty_driver->init_termios.c_cflag =
	    B9600 | CS8 | CREAD | HUPCL | CLOCAL;
	ipw_tty_driver->init_termios.c_ispeed = 9600;
	ipw_tty_driver->init_termios.c_ospeed = 9600;
	tty_set_operations(ipw_tty_driver, &tty_ops);
	result = tty_register_driver(ipw_tty_driver);
	if (result) {
		printk(KERN_ERR IPWIRELESS_PCCARD_NAME
		       ": failed to register tty driver\n");
		put_tty_driver(ipw_tty_driver);
		return result;
	}

	return 0;
}

void ipwireless_tty_release(void)
{
	int ret;

	ret = tty_unregister_driver(ipw_tty_driver);
	put_tty_driver(ipw_tty_driver);
	if (ret != 0)
		printk(KERN_ERR IPWIRELESS_PCCARD_NAME
			": tty_unregister_driver failed with code %d\n", ret);
}

int ipwireless_tty_is_modem(struct ipw_tty *tty)
{
	return tty->tty_type == TTYTYPE_MODEM;
}

void
ipwireless_tty_notify_control_line_change(struct ipw_tty *tty,
					  unsigned int channel_idx,
					  unsigned int control_lines,
					  unsigned int changed_mask)
{
	unsigned int old_control_lines = tty->control_lines;

	tty->control_lines = (tty->control_lines & ~changed_mask)
		| (control_lines & changed_mask);

	/*
	 * If DCD is de-asserted, we close the tty so pppd can tell that we
	 * have gone offline.
	 */
	if ((old_control_lines & IPW_CONTROL_LINE_DCD)
			&& !(tty->control_lines & IPW_CONTROL_LINE_DCD)
			&& tty->port.tty) {
		tty_hangup(tty->port.tty);
	}
}
Commit	Line	Data
099dc4fb DS	1	/*
	2	* IPWireless 3G PCMCIA Network Driver
	3	*
	4	* Original code
	5	* by Stephen Blackheath <stephen@blacksapphire.com>,
	6	* Ben Martel <benm@symmetric.co.nz>
	7	*
	8	* Copyrighted as follows:
	9	* Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
	10	*
	11	* Various driver changes and rewrites, port to new kernels
	12	* Copyright (C) 2006-2007 Jiri Kosina
	13	*
	14	* Misc code cleanups and updates
	15	* Copyright (C) 2007 David Sterba
	16	*/
	17
099dc4fb DS	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/mutex.h>
	21	#include <linux/ppp_defs.h>
	22	#include <linux/if.h>
4b32da2b	23	#include <linux/ppp-ioctl.h>
099dc4fb DS	24	#include <linux/sched.h>
	25	#include <linux/serial.h>
	26	#include <linux/slab.h>
	27	#include <linux/tty.h>
	28	#include <linux/tty_driver.h>
	29	#include <linux/tty_flip.h>
	30	#include <linux/uaccess.h>
099dc4fb DS	31
	32	#include "tty.h"
	33	#include "network.h"
	34	#include "hardware.h"
	35	#include "main.h"
	36
	37	#define IPWIRELESS_PCMCIA_START (0)
	38	#define IPWIRELESS_PCMCIA_MINORS (24)
	39	#define IPWIRELESS_PCMCIA_MINOR_RANGE (8)
	40
	41	#define TTYTYPE_MODEM (0)
	42	#define TTYTYPE_MONITOR (1)
	43	#define TTYTYPE_RAS_RAW (2)
	44
	45	struct ipw_tty {
7393af80	46	struct tty_port port;
099dc4fb DS	47	int index;
	48	struct ipw_hardware *hardware;
	49	unsigned int channel_idx;
	50	unsigned int secondary_channel_idx;
	51	int tty_type;
	52	struct ipw_network *network;
099dc4fb DS	53	unsigned int control_lines;
	54	struct mutex ipw_tty_mutex;
	55	int tx_bytes_queued;
	56	int closing;
	57	};
	58
	59	static struct ipw_tty *ttys[IPWIRELESS_PCMCIA_MINORS];
	60
	61	static struct tty_driver *ipw_tty_driver;
	62
	63	static char *tty_type_name(int tty_type)
	64	{
	65	static char *channel_names[] = {
	66	"modem",
	67	"monitor",
	68	"RAS-raw"
	69	};
	70
	71	return channel_names[tty_type];
	72	}
	73
ecaa3bda	74	static struct ipw_tty *get_tty(int index)
099dc4fb	75	{
ecaa3bda JS	76	/*
	77	* The 'ras_raw' channel is only available when 'loopback' mode
	78	* is enabled.
	79	* Number of minor starts with 16 (_RANGE * _RAS_RAW).
	80	*/
	81	if (!ipwireless_loopback && index >=
	82	IPWIRELESS_PCMCIA_MINOR_RANGE * TTYTYPE_RAS_RAW)
099dc4fb	83	return NULL;
ecaa3bda JS	84
ecaa3bda JS	85	return ttys[index];
099dc4fb DS	86	}
	87
	88	static int ipw_open(struct tty_struct linux_tty, struct file filp)
	89	{
ecaa3bda	90	struct ipw_tty *tty = get_tty(linux_tty->index);
099dc4fb DS	91
	92	if (!tty)
	93	return -ENODEV;
	94
	95	mutex_lock(&tty->ipw_tty_mutex);
7393af80	96	if (tty->port.count == 0)
099dc4fb DS	97	tty->tx_bytes_queued = 0;
099dc4fb DS	98
7393af80	99	tty->port.count++;
099dc4fb	100
19ef1b71	101	tty->port.tty = linux_tty;
099dc4fb	102	linux_tty->driver_data = tty;
d6c53c0e	103	tty->port.low_latency = 1;
099dc4fb DS	104
	105	if (tty->tty_type == TTYTYPE_MODEM)
	106	ipwireless_ppp_open(tty->network);
	107
	108	mutex_unlock(&tty->ipw_tty_mutex);
	109
	110	return 0;
	111	}
	112
	113	static void do_ipw_close(struct ipw_tty *tty)
	114	{
7393af80	115	tty->port.count--;
099dc4fb	116
7393af80	117	if (tty->port.count == 0) {
19ef1b71	118	struct tty_struct *linux_tty = tty->port.tty;
099dc4fb DS	119
099dc4fb DS	120	if (linux_tty != NULL) {
19ef1b71	121	tty->port.tty = NULL;
099dc4fb DS	122	linux_tty->driver_data = NULL;
	123
	124	if (tty->tty_type == TTYTYPE_MODEM)
	125	ipwireless_ppp_close(tty->network);
	126	}
	127	}
	128	}
	129
	130	static void ipw_hangup(struct tty_struct *linux_tty)
	131	{
	132	struct ipw_tty *tty = linux_tty->driver_data;
	133
	134	if (!tty)
	135	return;
	136
	137	mutex_lock(&tty->ipw_tty_mutex);
7393af80	138	if (tty->port.count == 0) {
099dc4fb DS	139	mutex_unlock(&tty->ipw_tty_mutex);
	140	return;
	141	}
	142
	143	do_ipw_close(tty);
	144
	145	mutex_unlock(&tty->ipw_tty_mutex);
	146	}
	147
	148	static void ipw_close(struct tty_struct linux_tty, struct file filp)
	149	{
	150	ipw_hangup(linux_tty);
	151	}
	152
	153	/* Take data received from hardware, and send it out the tty */
	154	void ipwireless_tty_received(struct ipw_tty tty, unsigned char data,
	155	unsigned int length)
	156	{
099dc4fb DS	157	int work = 0;
	158
	159	mutex_lock(&tty->ipw_tty_mutex);
099dc4fb	160
7393af80	161	if (!tty->port.count) {
099dc4fb DS	162	mutex_unlock(&tty->ipw_tty_mutex);
	163	return;
	164	}
	165	mutex_unlock(&tty->ipw_tty_mutex);
	166
05c7cd39	167	work = tty_insert_flip_string(&tty->port, data, length);
099dc4fb DS	168
	169	if (work != length)
	170	printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
	171	": %d chars not inserted to flip buffer!\n",
	172	length - work);
	173
099dc4fb	174	if (work)
2e124b4a	175	tty_flip_buffer_push(&tty->port);
099dc4fb DS	176	}
	177
	178	static void ipw_write_packet_sent_callback(void *callback_data,
	179	unsigned int packet_length)
	180	{
	181	struct ipw_tty *tty = callback_data;
	182
	183	/*
	184	* Packet has been sent, so we subtract the number of bytes from our
	185	* tally of outstanding TX bytes.
	186	*/
	187	tty->tx_bytes_queued -= packet_length;
	188	}
	189
	190	static int ipw_write(struct tty_struct *linux_tty,
	191	const unsigned char *buf, int count)
	192	{
	193	struct ipw_tty *tty = linux_tty->driver_data;
	194	int room, ret;
	195
	196	if (!tty)
	197	return -ENODEV;
	198
	199	mutex_lock(&tty->ipw_tty_mutex);
7393af80	200	if (!tty->port.count) {
099dc4fb DS	201	mutex_unlock(&tty->ipw_tty_mutex);
	202	return -EINVAL;
	203	}
	204
	205	room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
	206	if (room < 0)
	207	room = 0;
	208	/* Don't allow caller to write any more than we have room for */
	209	if (count > room)
	210	count = room;
	211
	212	if (count == 0) {
	213	mutex_unlock(&tty->ipw_tty_mutex);
	214	return 0;
	215	}
	216
	217	ret = ipwireless_send_packet(tty->hardware, IPW_CHANNEL_RAS,
ff3e990e	218	buf, count,
099dc4fb DS	219	ipw_write_packet_sent_callback, tty);
	220	if (ret == -1) {
	221	mutex_unlock(&tty->ipw_tty_mutex);
	222	return 0;
	223	}
	224
	225	tty->tx_bytes_queued += count;
	226	mutex_unlock(&tty->ipw_tty_mutex);
	227
	228	return count;
	229	}
	230
	231	static int ipw_write_room(struct tty_struct *linux_tty)
	232	{
	233	struct ipw_tty *tty = linux_tty->driver_data;
	234	int room;
	235
5aaa70a8	236	/* FIXME: Exactly how is the tty object locked here .. */
099dc4fb DS	237	if (!tty)
	238	return -ENODEV;
	239
7393af80	240	if (!tty->port.count)
099dc4fb DS	241	return -EINVAL;
	242
	243	room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
	244	if (room < 0)
	245	room = 0;
	246
	247	return room;
	248	}
	249
	250	static int ipwireless_get_serial_info(struct ipw_tty *tty,
	251	struct serial_struct __user *retinfo)
	252	{
	253	struct serial_struct tmp;
	254
099dc4fb DS	255	memset(&tmp, 0, sizeof(tmp));
	256	tmp.type = PORT_UNKNOWN;
	257	tmp.line = tty->index;
099dc4fb	258	tmp.baud_base = 115200;
fec4daec	259
099dc4fb DS	260	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
	261	return -EFAULT;
	262
	263	return 0;
	264	}
	265
	266	static int ipw_chars_in_buffer(struct tty_struct *linux_tty)
	267	{
	268	struct ipw_tty *tty = linux_tty->driver_data;
	269
	270	if (!tty)
23198fda	271	return 0;
099dc4fb	272
7393af80	273	if (!tty->port.count)
23198fda	274	return 0;
099dc4fb DS	275
	276	return tty->tx_bytes_queued;
	277	}
	278
	279	static int get_control_lines(struct ipw_tty *tty)
	280	{
	281	unsigned int my = tty->control_lines;
	282	unsigned int out = 0;
	283
	284	if (my & IPW_CONTROL_LINE_RTS)
	285	out \|= TIOCM_RTS;
	286	if (my & IPW_CONTROL_LINE_DTR)
	287	out \|= TIOCM_DTR;
	288	if (my & IPW_CONTROL_LINE_CTS)
	289	out \|= TIOCM_CTS;
	290	if (my & IPW_CONTROL_LINE_DSR)
	291	out \|= TIOCM_DSR;
	292	if (my & IPW_CONTROL_LINE_DCD)
	293	out \|= TIOCM_CD;
	294
	295	return out;
	296	}
	297
	298	static int set_control_lines(struct ipw_tty *tty, unsigned int set,
	299	unsigned int clear)
	300	{
	301	int ret;
	302
	303	if (set & TIOCM_RTS) {
	304	ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 1);
	305	if (ret)
	306	return ret;
	307	if (tty->secondary_channel_idx != -1) {
	308	ret = ipwireless_set_RTS(tty->hardware,
	309	tty->secondary_channel_idx, 1);
	310	if (ret)
	311	return ret;
	312	}
	313	}
	314	if (set & TIOCM_DTR) {
	315	ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 1);
	316	if (ret)
	317	return ret;
	318	if (tty->secondary_channel_idx != -1) {
	319	ret = ipwireless_set_DTR(tty->hardware,
	320	tty->secondary_channel_idx, 1);
	321	if (ret)
	322	return ret;
	323	}
	324	}
	325	if (clear & TIOCM_RTS) {
	326	ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 0);
	327	if (tty->secondary_channel_idx != -1) {
	328	ret = ipwireless_set_RTS(tty->hardware,
	329	tty->secondary_channel_idx, 0);
	330	if (ret)
	331	return ret;
	332	}
	333	}
	334	if (clear & TIOCM_DTR) {
	335	ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 0);
	336	if (tty->secondary_channel_idx != -1) {
	337	ret = ipwireless_set_DTR(tty->hardware,
	338	tty->secondary_channel_idx, 0);
339	if (ret)
340	return ret;
341	}
342	}
343	return 0;
344	}
345
60b33c13	346	static int ipw_tiocmget(struct tty_struct *linux_tty)
099dc4fb DS	347	{
099dc4fb DS	348	struct ipw_tty *tty = linux_tty->driver_data;
5aaa70a8	349	/* FIXME: Exactly how is the tty object locked here .. */
099dc4fb DS	350
	351	if (!tty)
	352	return -ENODEV;
	353
7393af80	354	if (!tty->port.count)
099dc4fb DS	355	return -EINVAL;
	356
	357	return get_control_lines(tty);
	358	}
	359
	360	static int
20b9d177	361	ipw_tiocmset(struct tty_struct *linux_tty,
099dc4fb DS	362	unsigned int set, unsigned int clear)
	363	{
	364	struct ipw_tty *tty = linux_tty->driver_data;
5aaa70a8	365	/* FIXME: Exactly how is the tty object locked here .. */
099dc4fb DS	366
	367	if (!tty)
	368	return -ENODEV;
	369
7393af80	370	if (!tty->port.count)
099dc4fb DS	371	return -EINVAL;
	372
	373	return set_control_lines(tty, set, clear);
	374	}
	375
6caa76b7	376	static int ipw_ioctl(struct tty_struct *linux_tty,
099dc4fb DS	377	unsigned int cmd, unsigned long arg)
	378	{
	379	struct ipw_tty *tty = linux_tty->driver_data;
	380
	381	if (!tty)
	382	return -ENODEV;
	383
7393af80	384	if (!tty->port.count)
099dc4fb DS	385	return -EINVAL;
099dc4fb DS	386
5aaa70a8 AC	387	/* FIXME: Exactly how is the tty object locked here .. */
5aaa70a8 AC	388
099dc4fb DS	389	switch (cmd) {
	390	case TIOCGSERIAL:
	391	return ipwireless_get_serial_info(tty, (void __user *) arg);
	392
	393	case TIOCSSERIAL:
	394	return 0; /* Keeps the PCMCIA scripts happy. */
	395	}
	396
	397	if (tty->tty_type == TTYTYPE_MODEM) {
	398	switch (cmd) {
	399	case PPPIOCGCHAN:
	400	{
	401	int chan = ipwireless_ppp_channel_index(
	402	tty->network);
	403
	404	if (chan < 0)
	405	return -ENODEV;
	406	if (put_user(chan, (int __user *) arg))
	407	return -EFAULT;
	408	}
	409	return 0;
	410
	411	case PPPIOCGUNIT:
	412	{
	413	int unit = ipwireless_ppp_unit_number(
	414	tty->network);
	415
	416	if (unit < 0)
	417	return -ENODEV;
	418	if (put_user(unit, (int __user *) arg))
	419	return -EFAULT;
	420	}
	421	return 0;
	422
099dc4fb DS	423	case FIONREAD:
	424	{
	425	int val = 0;
	426
	427	if (put_user(val, (int __user *) arg))
	428	return -EFAULT;
	429	}
	430	return 0;
5aaa70a8 AC	431	case TCFLSH:
5aaa70a8 AC	432	return tty_perform_flush(linux_tty, arg);
099dc4fb DS	433	}
099dc4fb DS	434	}
6caa76b7	435	return -ENOIOCTLCMD;
099dc4fb DS	436	}
099dc4fb DS	437
b498ada6	438	static int add_tty(int j,
099dc4fb DS	439	struct ipw_hardware *hardware,
	440	struct ipw_network *network, int channel_idx,
	441	int secondary_channel_idx, int tty_type)
	442	{
	443	ttys[j] = kzalloc(sizeof(struct ipw_tty), GFP_KERNEL);
	444	if (!ttys[j])
	445	return -ENOMEM;
	446	ttys[j]->index = j;
	447	ttys[j]->hardware = hardware;
	448	ttys[j]->channel_idx = channel_idx;
	449	ttys[j]->secondary_channel_idx = secondary_channel_idx;
	450	ttys[j]->network = network;
	451	ttys[j]->tty_type = tty_type;
	452	mutex_init(&ttys[j]->ipw_tty_mutex);
7393af80	453	tty_port_init(&ttys[j]->port);
099dc4fb	454
734cc178	455	tty_port_register_device(&ttys[j]->port, ipw_tty_driver, j, NULL);
099dc4fb DS	456	ipwireless_associate_network_tty(network, channel_idx, ttys[j]);
	457
	458	if (secondary_channel_idx != -1)
	459	ipwireless_associate_network_tty(network,
	460	secondary_channel_idx,
	461	ttys[j]);
e6df3cce JS	462	/* check if we provide raw device (if loopback is enabled) */
	463	if (get_tty(j))
	464	printk(KERN_INFO IPWIRELESS_PCCARD_NAME
	465	": registering %s device ttyIPWp%d\n",
	466	tty_type_name(tty_type), j);
	467
099dc4fb DS	468	return 0;
	469	}
	470
	471	struct ipw_tty ipwireless_tty_create(struct ipw_hardware hardware,
b498ada6	472	struct ipw_network *network)
099dc4fb DS	473	{
	474	int i, j;
	475
	476	for (i = 0; i < IPWIRELESS_PCMCIA_MINOR_RANGE; i++) {
	477	int allfree = 1;
	478
	479	for (j = i; j < IPWIRELESS_PCMCIA_MINORS;
	480	j += IPWIRELESS_PCMCIA_MINOR_RANGE)
	481	if (ttys[j] != NULL) {
	482	allfree = 0;
	483	break;
	484	}
	485
	486	if (allfree) {
	487	j = i;
	488
b498ada6	489	if (add_tty(j, hardware, network,
099dc4fb DS	490	IPW_CHANNEL_DIALLER, IPW_CHANNEL_RAS,
	491	TTYTYPE_MODEM))
	492	return NULL;
	493
	494	j += IPWIRELESS_PCMCIA_MINOR_RANGE;
b498ada6	495	if (add_tty(j, hardware, network,
099dc4fb DS	496	IPW_CHANNEL_DIALLER, -1,
	497	TTYTYPE_MONITOR))
	498	return NULL;
	499
	500	j += IPWIRELESS_PCMCIA_MINOR_RANGE;
b498ada6	501	if (add_tty(j, hardware, network,
099dc4fb DS	502	IPW_CHANNEL_RAS, -1,
	503	TTYTYPE_RAS_RAW))
	504	return NULL;
	505
099dc4fb DS	506	return ttys[i];
	507	}
	508	}
	509	return NULL;
	510	}
	511
	512	/*
	513	* Must be called before ipwireless_network_free().
	514	*/
	515	void ipwireless_tty_free(struct ipw_tty *tty)
	516	{
	517	int j;
	518	struct ipw_network *network = ttys[tty->index]->network;
	519
	520	for (j = tty->index; j < IPWIRELESS_PCMCIA_MINORS;
	521	j += IPWIRELESS_PCMCIA_MINOR_RANGE) {
	522	struct ipw_tty *ttyj = ttys[j];
	523
	524	if (ttyj) {
	525	mutex_lock(&ttyj->ipw_tty_mutex);
e6df3cce JS	526	if (get_tty(j))
	527	printk(KERN_INFO IPWIRELESS_PCCARD_NAME
	528	": deregistering %s device ttyIPWp%d\n",
	529	tty_type_name(ttyj->tty_type), j);
099dc4fb	530	ttyj->closing = 1;
19ef1b71	531	if (ttyj->port.tty != NULL) {
099dc4fb	532	mutex_unlock(&ttyj->ipw_tty_mutex);
19ef1b71	533	tty_vhangup(ttyj->port.tty);
5aaa70a8 AC	534	/* FIXME: Exactly how is the tty object locked here
5aaa70a8 AC	535	against a parallel ioctl etc */
de3a60a3 JS	536	/* FIXME2: hangup does not mean all processes
de3a60a3 JS	537	* are gone */
099dc4fb DS	538	mutex_lock(&ttyj->ipw_tty_mutex);
099dc4fb DS	539	}
7393af80	540	while (ttyj->port.count)
099dc4fb DS	541	do_ipw_close(ttyj);
	542	ipwireless_disassociate_network_ttys(network,
	543	ttyj->channel_idx);
	544	tty_unregister_device(ipw_tty_driver, j);
191c5f10	545	tty_port_destroy(&ttyj->port);
099dc4fb DS	546	ttys[j] = NULL;
	547	mutex_unlock(&ttyj->ipw_tty_mutex);
	548	kfree(ttyj);
	549	}
	550	}
	551	}
	552
1cceefd3	553	static const struct tty_operations tty_ops = {
099dc4fb DS	554	.open = ipw_open,
	555	.close = ipw_close,
	556	.hangup = ipw_hangup,
	557	.write = ipw_write,
	558	.write_room = ipw_write_room,
	559	.ioctl = ipw_ioctl,
	560	.chars_in_buffer = ipw_chars_in_buffer,
	561	.tiocmget = ipw_tiocmget,
	562	.tiocmset = ipw_tiocmset,
	563	};
	564
	565	int ipwireless_tty_init(void)
	566	{
	567	int result;
	568
	569	ipw_tty_driver = alloc_tty_driver(IPWIRELESS_PCMCIA_MINORS);
	570	if (!ipw_tty_driver)
	571	return -ENOMEM;
	572
099dc4fb DS	573	ipw_tty_driver->driver_name = IPWIRELESS_PCCARD_NAME;
	574	ipw_tty_driver->name = "ttyIPWp";
	575	ipw_tty_driver->major = 0;
	576	ipw_tty_driver->minor_start = IPWIRELESS_PCMCIA_START;
	577	ipw_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
	578	ipw_tty_driver->subtype = SERIAL_TYPE_NORMAL;
	579	ipw_tty_driver->flags = TTY_DRIVER_REAL_RAW \| TTY_DRIVER_DYNAMIC_DEV;
	580	ipw_tty_driver->init_termios = tty_std_termios;
	581	ipw_tty_driver->init_termios.c_cflag =
	582	B9600 \| CS8 \| CREAD \| HUPCL \| CLOCAL;
	583	ipw_tty_driver->init_termios.c_ispeed = 9600;
	584	ipw_tty_driver->init_termios.c_ospeed = 9600;
	585	tty_set_operations(ipw_tty_driver, &tty_ops);
	586	result = tty_register_driver(ipw_tty_driver);
	587	if (result) {
	588	printk(KERN_ERR IPWIRELESS_PCCARD_NAME
	589	": failed to register tty driver\n");
	590	put_tty_driver(ipw_tty_driver);
	591	return result;
	592	}
	593
	594	return 0;
	595	}
	596
	597	void ipwireless_tty_release(void)
	598	{
	599	int ret;
	600
	601	ret = tty_unregister_driver(ipw_tty_driver);
	602	put_tty_driver(ipw_tty_driver);
	603	if (ret != 0)
	604	printk(KERN_ERR IPWIRELESS_PCCARD_NAME
	605	": tty_unregister_driver failed with code %d\n", ret);
	606	}
	607
	608	int ipwireless_tty_is_modem(struct ipw_tty *tty)
	609	{
	610	return tty->tty_type == TTYTYPE_MODEM;
	611	}
	612
	613	void
	614	ipwireless_tty_notify_control_line_change(struct ipw_tty *tty,
	615	unsigned int channel_idx,
	616	unsigned int control_lines,
	617	unsigned int changed_mask)
	618	{
	619	unsigned int old_control_lines = tty->control_lines;
	620
	621	tty->control_lines = (tty->control_lines & ~changed_mask)
	622	\| (control_lines & changed_mask);
	623
	624	/*
	625	* If DCD is de-asserted, we close the tty so pppd can tell that we
	626	* have gone offline.
	627	*/
	628	if ((old_control_lines & IPW_CONTROL_LINE_DCD)
	629	&& !(tty->control_lines & IPW_CONTROL_LINE_DCD)
19ef1b71 JS	630	&& tty->port.tty) {
19ef1b71 JS	631	tty_hangup(tty->port.tty);
099dc4fb DS	632	}
	633	}
	634