--- /dev/null
+/*
+ * 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;
+
+ if (!retinfo)
+ return (-EFAULT);
+
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.type = PORT_UNKNOWN;
+ tmp.line = tty->index;
+ tmp.port = 0;
+ tmp.irq = 0;
+ tmp.flags = 0;
+ tmp.baud_base = 115200;
+ tmp.close_delay = 0;
+ tmp.closing_wait = 0;
+ tmp.custom_divisor = 0;
+ tmp.hub6 = 0;
+ 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);
+ }
+}
+
Code Review / kvmfornfv.git / blobdiff