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![Jiri Slaby](/assets/img/avatar_default.png)
In ipwireless_get_serial_info, struct serial_struct is memset to 0 and then some members set to 0 explicitly. Remove the latter as it is obviously superfluous. And remove the retinfo check against NULL. copy_to_user will take care of that. Part of hub6 cleanup series. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Jiri Kosina <jikos@kernel.org> Acked-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
634 lines
14 KiB
C
634 lines
14 KiB
C
/*
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* IPWireless 3G PCMCIA Network Driver
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*
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* Original code
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* by Stephen Blackheath <stephen@blacksapphire.com>,
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* Ben Martel <benm@symmetric.co.nz>
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*
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* Copyrighted as follows:
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* Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
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*
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* Various driver changes and rewrites, port to new kernels
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* Copyright (C) 2006-2007 Jiri Kosina
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*
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* Misc code cleanups and updates
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* Copyright (C) 2007 David Sterba
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/ppp_defs.h>
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#include <linux/if.h>
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#include <linux/ppp-ioctl.h>
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#include <linux/sched.h>
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#include <linux/serial.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/uaccess.h>
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#include "tty.h"
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#include "network.h"
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#include "hardware.h"
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#include "main.h"
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#define IPWIRELESS_PCMCIA_START (0)
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#define IPWIRELESS_PCMCIA_MINORS (24)
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#define IPWIRELESS_PCMCIA_MINOR_RANGE (8)
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#define TTYTYPE_MODEM (0)
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#define TTYTYPE_MONITOR (1)
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#define TTYTYPE_RAS_RAW (2)
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struct ipw_tty {
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struct tty_port port;
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int index;
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struct ipw_hardware *hardware;
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unsigned int channel_idx;
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unsigned int secondary_channel_idx;
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int tty_type;
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struct ipw_network *network;
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unsigned int control_lines;
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struct mutex ipw_tty_mutex;
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int tx_bytes_queued;
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int closing;
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};
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static struct ipw_tty *ttys[IPWIRELESS_PCMCIA_MINORS];
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static struct tty_driver *ipw_tty_driver;
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static char *tty_type_name(int tty_type)
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{
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static char *channel_names[] = {
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"modem",
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"monitor",
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"RAS-raw"
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};
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return channel_names[tty_type];
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}
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static struct ipw_tty *get_tty(int index)
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{
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/*
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* The 'ras_raw' channel is only available when 'loopback' mode
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* is enabled.
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* Number of minor starts with 16 (_RANGE * _RAS_RAW).
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*/
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if (!ipwireless_loopback && index >=
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IPWIRELESS_PCMCIA_MINOR_RANGE * TTYTYPE_RAS_RAW)
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return NULL;
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return ttys[index];
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}
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static int ipw_open(struct tty_struct *linux_tty, struct file *filp)
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{
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struct ipw_tty *tty = get_tty(linux_tty->index);
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if (!tty)
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return -ENODEV;
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mutex_lock(&tty->ipw_tty_mutex);
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if (tty->port.count == 0)
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tty->tx_bytes_queued = 0;
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tty->port.count++;
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tty->port.tty = linux_tty;
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linux_tty->driver_data = tty;
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tty->port.low_latency = 1;
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if (tty->tty_type == TTYTYPE_MODEM)
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ipwireless_ppp_open(tty->network);
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mutex_unlock(&tty->ipw_tty_mutex);
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return 0;
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}
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static void do_ipw_close(struct ipw_tty *tty)
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{
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tty->port.count--;
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if (tty->port.count == 0) {
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struct tty_struct *linux_tty = tty->port.tty;
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if (linux_tty != NULL) {
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tty->port.tty = NULL;
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linux_tty->driver_data = NULL;
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if (tty->tty_type == TTYTYPE_MODEM)
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ipwireless_ppp_close(tty->network);
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}
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}
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}
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static void ipw_hangup(struct tty_struct *linux_tty)
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{
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struct ipw_tty *tty = linux_tty->driver_data;
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if (!tty)
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return;
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mutex_lock(&tty->ipw_tty_mutex);
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if (tty->port.count == 0) {
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mutex_unlock(&tty->ipw_tty_mutex);
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return;
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}
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do_ipw_close(tty);
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mutex_unlock(&tty->ipw_tty_mutex);
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}
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static void ipw_close(struct tty_struct *linux_tty, struct file *filp)
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{
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ipw_hangup(linux_tty);
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}
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/* Take data received from hardware, and send it out the tty */
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void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
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unsigned int length)
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{
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int work = 0;
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mutex_lock(&tty->ipw_tty_mutex);
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if (!tty->port.count) {
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mutex_unlock(&tty->ipw_tty_mutex);
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return;
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}
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mutex_unlock(&tty->ipw_tty_mutex);
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work = tty_insert_flip_string(&tty->port, data, length);
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if (work != length)
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printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
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": %d chars not inserted to flip buffer!\n",
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length - work);
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if (work)
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tty_flip_buffer_push(&tty->port);
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}
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static void ipw_write_packet_sent_callback(void *callback_data,
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unsigned int packet_length)
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{
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struct ipw_tty *tty = callback_data;
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/*
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* Packet has been sent, so we subtract the number of bytes from our
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* tally of outstanding TX bytes.
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*/
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tty->tx_bytes_queued -= packet_length;
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}
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static int ipw_write(struct tty_struct *linux_tty,
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const unsigned char *buf, int count)
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{
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struct ipw_tty *tty = linux_tty->driver_data;
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int room, ret;
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if (!tty)
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return -ENODEV;
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mutex_lock(&tty->ipw_tty_mutex);
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if (!tty->port.count) {
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mutex_unlock(&tty->ipw_tty_mutex);
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return -EINVAL;
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}
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room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
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if (room < 0)
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room = 0;
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/* Don't allow caller to write any more than we have room for */
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if (count > room)
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count = room;
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if (count == 0) {
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mutex_unlock(&tty->ipw_tty_mutex);
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return 0;
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}
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ret = ipwireless_send_packet(tty->hardware, IPW_CHANNEL_RAS,
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buf, count,
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ipw_write_packet_sent_callback, tty);
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if (ret == -1) {
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mutex_unlock(&tty->ipw_tty_mutex);
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return 0;
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}
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tty->tx_bytes_queued += count;
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mutex_unlock(&tty->ipw_tty_mutex);
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return count;
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}
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static int ipw_write_room(struct tty_struct *linux_tty)
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{
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struct ipw_tty *tty = linux_tty->driver_data;
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int room;
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/* FIXME: Exactly how is the tty object locked here .. */
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if (!tty)
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return -ENODEV;
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if (!tty->port.count)
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return -EINVAL;
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room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
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if (room < 0)
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room = 0;
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return room;
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}
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static int ipwireless_get_serial_info(struct ipw_tty *tty,
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struct serial_struct __user *retinfo)
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{
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struct serial_struct tmp;
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memset(&tmp, 0, sizeof(tmp));
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tmp.type = PORT_UNKNOWN;
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tmp.line = tty->index;
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tmp.baud_base = 115200;
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if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
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return -EFAULT;
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return 0;
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}
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static int ipw_chars_in_buffer(struct tty_struct *linux_tty)
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{
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struct ipw_tty *tty = linux_tty->driver_data;
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if (!tty)
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return 0;
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if (!tty->port.count)
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return 0;
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return tty->tx_bytes_queued;
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}
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static int get_control_lines(struct ipw_tty *tty)
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{
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unsigned int my = tty->control_lines;
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unsigned int out = 0;
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if (my & IPW_CONTROL_LINE_RTS)
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out |= TIOCM_RTS;
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if (my & IPW_CONTROL_LINE_DTR)
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out |= TIOCM_DTR;
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if (my & IPW_CONTROL_LINE_CTS)
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out |= TIOCM_CTS;
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if (my & IPW_CONTROL_LINE_DSR)
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out |= TIOCM_DSR;
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if (my & IPW_CONTROL_LINE_DCD)
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out |= TIOCM_CD;
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return out;
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}
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static int set_control_lines(struct ipw_tty *tty, unsigned int set,
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unsigned int clear)
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{
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int ret;
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if (set & TIOCM_RTS) {
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ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 1);
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if (ret)
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return ret;
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if (tty->secondary_channel_idx != -1) {
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ret = ipwireless_set_RTS(tty->hardware,
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tty->secondary_channel_idx, 1);
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if (ret)
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return ret;
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}
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}
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if (set & TIOCM_DTR) {
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ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 1);
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if (ret)
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return ret;
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if (tty->secondary_channel_idx != -1) {
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ret = ipwireless_set_DTR(tty->hardware,
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tty->secondary_channel_idx, 1);
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if (ret)
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return ret;
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}
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}
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if (clear & TIOCM_RTS) {
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ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 0);
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if (tty->secondary_channel_idx != -1) {
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ret = ipwireless_set_RTS(tty->hardware,
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tty->secondary_channel_idx, 0);
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if (ret)
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return ret;
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}
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}
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if (clear & TIOCM_DTR) {
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ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 0);
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if (tty->secondary_channel_idx != -1) {
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ret = ipwireless_set_DTR(tty->hardware,
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tty->secondary_channel_idx, 0);
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if (ret)
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return ret;
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}
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}
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return 0;
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}
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static int ipw_tiocmget(struct tty_struct *linux_tty)
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{
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struct ipw_tty *tty = linux_tty->driver_data;
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/* FIXME: Exactly how is the tty object locked here .. */
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if (!tty)
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return -ENODEV;
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if (!tty->port.count)
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return -EINVAL;
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return get_control_lines(tty);
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}
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static int
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ipw_tiocmset(struct tty_struct *linux_tty,
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unsigned int set, unsigned int clear)
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{
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struct ipw_tty *tty = linux_tty->driver_data;
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/* FIXME: Exactly how is the tty object locked here .. */
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if (!tty)
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return -ENODEV;
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if (!tty->port.count)
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return -EINVAL;
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return set_control_lines(tty, set, clear);
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}
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static int ipw_ioctl(struct tty_struct *linux_tty,
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unsigned int cmd, unsigned long arg)
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{
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struct ipw_tty *tty = linux_tty->driver_data;
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if (!tty)
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return -ENODEV;
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if (!tty->port.count)
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return -EINVAL;
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/* FIXME: Exactly how is the tty object locked here .. */
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switch (cmd) {
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case TIOCGSERIAL:
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return ipwireless_get_serial_info(tty, (void __user *) arg);
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case TIOCSSERIAL:
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return 0; /* Keeps the PCMCIA scripts happy. */
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}
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if (tty->tty_type == TTYTYPE_MODEM) {
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switch (cmd) {
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case PPPIOCGCHAN:
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{
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int chan = ipwireless_ppp_channel_index(
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tty->network);
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if (chan < 0)
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return -ENODEV;
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if (put_user(chan, (int __user *) arg))
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return -EFAULT;
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}
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return 0;
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case PPPIOCGUNIT:
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{
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int unit = ipwireless_ppp_unit_number(
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tty->network);
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if (unit < 0)
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return -ENODEV;
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if (put_user(unit, (int __user *) arg))
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return -EFAULT;
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}
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return 0;
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case FIONREAD:
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{
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int val = 0;
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if (put_user(val, (int __user *) arg))
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return -EFAULT;
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}
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return 0;
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case TCFLSH:
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return tty_perform_flush(linux_tty, arg);
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}
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}
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return -ENOIOCTLCMD;
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}
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static int add_tty(int j,
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struct ipw_hardware *hardware,
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struct ipw_network *network, int channel_idx,
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int secondary_channel_idx, int tty_type)
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{
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ttys[j] = kzalloc(sizeof(struct ipw_tty), GFP_KERNEL);
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if (!ttys[j])
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return -ENOMEM;
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ttys[j]->index = j;
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ttys[j]->hardware = hardware;
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ttys[j]->channel_idx = channel_idx;
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ttys[j]->secondary_channel_idx = secondary_channel_idx;
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ttys[j]->network = network;
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ttys[j]->tty_type = tty_type;
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mutex_init(&ttys[j]->ipw_tty_mutex);
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tty_port_init(&ttys[j]->port);
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tty_port_register_device(&ttys[j]->port, ipw_tty_driver, j, NULL);
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ipwireless_associate_network_tty(network, channel_idx, ttys[j]);
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if (secondary_channel_idx != -1)
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ipwireless_associate_network_tty(network,
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secondary_channel_idx,
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ttys[j]);
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/* check if we provide raw device (if loopback is enabled) */
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if (get_tty(j))
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printk(KERN_INFO IPWIRELESS_PCCARD_NAME
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": registering %s device ttyIPWp%d\n",
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tty_type_name(tty_type), j);
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return 0;
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}
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struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hardware,
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struct ipw_network *network)
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{
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int i, j;
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for (i = 0; i < IPWIRELESS_PCMCIA_MINOR_RANGE; i++) {
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int allfree = 1;
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for (j = i; j < IPWIRELESS_PCMCIA_MINORS;
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j += IPWIRELESS_PCMCIA_MINOR_RANGE)
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if (ttys[j] != NULL) {
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allfree = 0;
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break;
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}
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if (allfree) {
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j = i;
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if (add_tty(j, hardware, network,
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IPW_CHANNEL_DIALLER, IPW_CHANNEL_RAS,
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TTYTYPE_MODEM))
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return NULL;
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j += IPWIRELESS_PCMCIA_MINOR_RANGE;
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if (add_tty(j, hardware, network,
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IPW_CHANNEL_DIALLER, -1,
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TTYTYPE_MONITOR))
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return NULL;
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j += IPWIRELESS_PCMCIA_MINOR_RANGE;
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if (add_tty(j, hardware, network,
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IPW_CHANNEL_RAS, -1,
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TTYTYPE_RAS_RAW))
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return NULL;
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return ttys[i];
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}
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}
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return NULL;
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}
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/*
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* Must be called before ipwireless_network_free().
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*/
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void ipwireless_tty_free(struct ipw_tty *tty)
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{
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int j;
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struct ipw_network *network = ttys[tty->index]->network;
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for (j = tty->index; j < IPWIRELESS_PCMCIA_MINORS;
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j += IPWIRELESS_PCMCIA_MINOR_RANGE) {
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struct ipw_tty *ttyj = ttys[j];
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if (ttyj) {
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mutex_lock(&ttyj->ipw_tty_mutex);
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if (get_tty(j))
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printk(KERN_INFO IPWIRELESS_PCCARD_NAME
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": deregistering %s device ttyIPWp%d\n",
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tty_type_name(ttyj->tty_type), j);
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ttyj->closing = 1;
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if (ttyj->port.tty != NULL) {
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mutex_unlock(&ttyj->ipw_tty_mutex);
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tty_vhangup(ttyj->port.tty);
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/* FIXME: Exactly how is the tty object locked here
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against a parallel ioctl etc */
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/* FIXME2: hangup does not mean all processes
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* are gone */
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mutex_lock(&ttyj->ipw_tty_mutex);
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}
|
|
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);
|
|
}
|
|
}
|
|
|