/******************************************************************************
*
* Driver for Option High Speed Mobile Devices.
*
* Copyright (C) 2008 Option International
* Filip Aben <f.aben@option.com>
* Denis Joseph Barrow <d.barow@option.com>
* Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
* <ajb@spheresystems.co.uk>
* Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
* Copyright (C) 2008 Novell, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*
*****************************************************************************/
/******************************************************************************
*
* Description of the device:
*
* Interface 0: Contains the IP network interface on the bulk end points.
* The multiplexed serial ports are using the interrupt and
* control endpoints.
* Interrupt contains a bitmap telling which multiplexed
* serialport needs servicing.
*
* Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
* port is opened, as this have a huge impact on the network port
* throughput.
*
* Interface 2: Standard modem interface - circuit switched interface, this
* can be used to make a standard ppp connection however it
* should not be used in conjunction with the IP network interface
* enabled for USB performance reasons i.e. if using this set
* ideally disable_net=1.
*
*****************************************************************************/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/module.h>
#include <linux/ethtool.h>
#include <linux/usb.h>
#include <linux/timer.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/kmod.h>
#include <linux/rfkill.h>
#include <linux/ip.h>
#include <linux/uaccess.h>
#include <linux/usb/cdc.h>
#include <net/arp.h>
#include <asm/byteorder.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#define DRIVER_VERSION "1.2"
#define MOD_AUTHOR "Option Wireless"
#define MOD_DESCRIPTION "USB High Speed Option driver"
#define MOD_LICENSE "GPL"
#define HSO_MAX_NET_DEVICES 10
#define HSO__MAX_MTU 2048
#define DEFAULT_MTU 1500
#define DEFAULT_MRU 1500
#define CTRL_URB_RX_SIZE 1024
#define CTRL_URB_TX_SIZE 64
#define BULK_URB_RX_SIZE 4096
#define BULK_URB_TX_SIZE 8192
#define MUX_BULK_RX_BUF_SIZE HSO__MAX_MTU
#define MUX_BULK_TX_BUF_SIZE HSO__MAX_MTU
#define MUX_BULK_RX_BUF_COUNT 4
#define USB_TYPE_OPTION_VENDOR 0x20
/* These definitions are used with the struct hso_net flags element */
/* - use *_bit operations on it. (bit indices not values.) */
#define HSO_NET_RUNNING 0
#define HSO_NET_TX_TIMEOUT (HZ*10)
#define HSO_SERIAL_MAGIC 0x48534f31
/* Number of ttys to handle */
#define HSO_SERIAL_TTY_MINORS 256
#define MAX_RX_URBS 2
static inline struct hso_serial *get_serial_by_tty(struct tty_struct *tty)
{
if (tty)
return tty->driver_data;
return NULL;
}
/*****************************************************************************/
/* Debugging functions */
/*****************************************************************************/
#define D__(lvl_, fmt, arg...) \
do { \
printk(lvl_ "[%d:%s]: " fmt "\n", \
__LINE__, __func__, ## arg); \
} while (0)
#define D_(lvl, args...) \
do { \
if (lvl & debug) \
D__(KERN_INFO, args); \
} while (0)
#define D1(args...) D_(0x01, ##args)
#define D2(args...) D_(0x02, ##args)
#define D3(args...) D_(0x04, ##args)
#define D4(args...) D_(0x08, ##args)
#define D5(args...) D_(0x10, ##args)
/*****************************************************************************/
/* Enumerators */
/*****************************************************************************/
enum pkt_parse_state {
WAIT_IP,
WAIT_DATA,
WAIT_SYNC
};
/*****************************************************************************/
/* Structs */
/*****************************************************************************/
struct hso_shared_int {
struct usb_endpoint_descriptor *intr_endp;
void *shared_intr_buf;
struct urb *shared_intr_urb;
struct usb_device *usb;
int use_count;
int ref_count;
struct mutex shared_int_lock;
};
struct hso_net {
struct hso_device *parent;
struct net_device *net;
struct rfkill *rfkill;
struct usb_endpoint_descriptor *in_endp;
struct usb_endpoint_descriptor *out_endp;
struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
struct urb *mux_bulk_tx_urb;
void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
void *mux_bulk_tx_buf;
struct sk_buff *skb_rx_buf;
struct sk_buff *skb_tx_buf;
enum pkt_parse_state rx_parse_state;
spinlock_t net_lock;
unsigned short rx_buf_size;
unsigned short rx_buf_missing;
struct iphdr rx_ip_hdr;
unsigned long flags;
};
enum rx_ctrl_state{
RX_IDLE,
RX_SENT,
RX_PENDING
};
#define BM_REQUEST_TYPE (0xa1)
#define B_NOTIFICATION (0x20)
#define W_VALUE (0x0)
#define W_INDEX (0x2)
#define W_LENGTH (0x2)
#define B_OVERRUN (0x1<<6)
#define B_PARITY (0x1<<5)
#define B_FRAMING (0x1<<4)
#define B_RING_SIGNAL (0x1<<3)
#define B_BREAK (0x1<<2)
#define B_TX_CARRIER (0x1<<1)
#define B_RX_CARRIER (0x1<<0)
struct hso_serial_state_notification {
u8 bmRequestType;
u8 bNotification;
u16 wValue;
u16 wIndex;
u16 wLength;
u16 UART_state_bitmap;
} __attribute__((packed));
struct hso_tiocmget {
struct mutex mutex;
wait_queue_head_t waitq;
int intr_completed;
struct usb_endpoint_descriptor *endp;
struct urb *urb;
struct hso_serial_state_notification serial_state_notification;
u16 prev_UART_state_bitmap;
struct uart_icount icount;
};
struct hso_serial {
struct hso_device *parent;
int magic;
u8 minor;
struct hso_shared_int *shared_int;
/* rx/tx urb could be either a bulk urb or a control urb depending
on which serial port it is used on. */
struct urb *rx_urb[MAX_RX_URBS];
u8 num_rx_urbs;
u8 *rx_data[MAX_RX_URBS];
u16 rx_data_length; /* should contain allocated length */
struct urb *tx_urb;
u8 *tx_data;
u8 *tx_buffer;
u16 tx_data_length; /* should contain allocated length */
u16 tx_data_count;
u16 tx_buffer_count;
struct usb_ctrlrequest ctrl_req_tx;
struct usb_ctrlrequest ctrl_req_rx;
struct usb_endpoint_descriptor *in_endp;
struct usb_endpoint_descriptor *out_endp;
enum rx_ctrl_state rx_state;
u8 rts_state;
u8 dtr_state;
unsigned tx_urb_used:1;
/* from usb_serial_port */
struct tty_struct *tty;
int open_count;
spinlock_t serial_lock;
int (*write_data) (struct hso_serial *serial);
struct hso_tiocmget *tiocmget;
/* Hacks required to get flow control
* working on the serial receive buffers
* so as not to drop characters on the floor.
*/
int curr_rx_urb_idx;
u16 curr_rx_urb_offset;
u8 rx_urb_filled[MAX_RX_URBS];
struct tasklet_struct unthrottle_tasklet;
struct work_struct retry_unthrottle_workqueue;
};
struct hso_device {
union {
struct hso_serial *dev_serial;
struct hso_net *dev_net;
} port_data;
u32 port_spec;
u8 is_active;
u8 usb_gone;
struct work_struct async_get_intf;
struct work_struct async_put_intf;
struct usb_device *usb;
struct usb_interface *interface;
struct device *dev;
struct kref ref;
struct mutex mutex;
};
/* Type of interface */
#define HSO_INTF_MASK 0xFF00
#define HSO_INTF_MUX 0x0100
#define HSO_INTF_BULK 0x0200
/* Type of port */
#define HSO_PORT_MASK 0xFF
#define HSO_PORT_NO_PORT 0x0
#define HSO_PORT_CONTROL 0x1
#define HSO_PORT_APP 0x2
#define HSO_PORT_GPS 0x3
#define HSO_PORT_PCSC 0x4
#define HSO_PORT_APP2 0x5
#define HSO_PORT_GPS_CONTROL 0x6
#define HSO_PORT_MSD 0x7
#define HSO_PORT_VOICE 0x8
#define HSO_PORT_DIAG2 0x9
#define HSO_PORT_DIAG 0x10
#define HSO_PORT_MODEM 0x11
#define HSO_PORT_NETWORK 0x12
/* Additional device info */
#define HSO_INFO_MASK 0xFF000000
#define HSO_INFO_CRC_BUG 0x01000000
/*****************************************************************************/
/* Prototypes */
/*****************************************************************************/
/* Serial driver functions */
static int hso_serial_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear);
static void ctrl_callback(struct urb *urb);
static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
static void hso_kick_transmit(struct hso_serial *serial);
/* Helper functions */
static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
struct usb_device *usb, gfp_t gfp);
static void log_usb_status(int status, const char *function);
static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
int type, int dir);
static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
static void hso_free_interface(struct usb_interface *intf);
static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
static int hso_stop_serial_device(struct hso_device *hso_dev);
static int hso_start_net_device(struct hso_device *hso_dev);
static void hso_free_shared_int(struct hso_shared_int *shared_int);
static int hso_stop_net_device(struct hso_device *hso_dev);
static void hso_serial_ref_free(struct kref *ref);
static void hso_std_serial_read_bulk_callback(struct urb *urb);
static int hso_mux_serial_read(struct hso_serial *serial);
static void async_get_intf(struct work_struct *data);
static void async_put_intf(struct work_struct *data);
static int hso_put_activity(struct hso_device *hso_dev);
static int hso_get_activity(struct hso_device *hso_dev);
static void tiocmget_intr_callback(struct urb *urb);
/*****************************************************************************/
/* Helping functions */
/*****************************************************************************/
/* #define DEBUG */
static inline struct hso_net *dev2net(struct hso_device *hso_dev)
{
return hso_dev->port_data.dev_net;
}
static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
{
return hso_dev->port_data.dev_serial;
}
/* Debugging functions */
#ifdef DEBUG
static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
unsigned int len)
{
static char name[255];
sprintf(name, "hso[%d:%s]", line_count, func_name);
print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
}
#define DUMP(buf_, len_) \
dbg_dump(__LINE__, __func__, buf_, len_)
#define DUMP1(buf_, len_) \
do { \
if (0x01 & debug) \
DUMP(buf_, len_); \
} while (0)
#else
#define DUMP(buf_, len_)
#define DUMP1(buf_, len_)
#endif
/* module parameters */
static int debug;
static int tty_major;
static int disable_net;
/* driver info */
static const char driver_name[] = "hso";
static const char tty_filename[] = "ttyHS";
static const char *version = __FILE__ ": " DRIVER_VERSION " " MOD_AUTHOR;
/* the usb driver itself (registered in hso_init) */
static struct usb_driver hso_driver;
/* serial structures */
static struct tty_driver *tty_drv;
static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
static spinlock_t serial_table_lock;
static const s32 default_port_spec[] = {
HSO_INTF_MUX | HSO_PORT_NETWORK,
HSO_INTF_BULK | HSO_PORT_DIAG,
HSO_INTF_BULK | HSO_PORT_MODEM,
0
};
static const s32 icon321_port_spec[] = {
HSO_INTF_MUX | HSO_PORT_NETWORK,
HSO_INTF_BULK | HSO_PORT_DIAG2,
HSO_INTF_BULK | HSO_PORT_MODEM,
HSO_INTF_BULK | HSO_PORT_DIAG,
0
};
#define default_port_device(vendor, product) \
USB_DEVICE(vendor, product), \
.driver_info = (kernel_ulong_t)default_port_spec
#define icon321_port_device(vendor, product) \
USB_DEVICE(vendor, product), \
.driver_info = (kernel_ulong_t)icon321_port_spec
/* list of devices we support */
static const struct usb_device_id hso_ids[] = {
{default_port_device(0x0af0, 0x6711)},
{default_port_device(0x0af0, 0x6731)},
{default_port_device(0x0af0, 0x6751)},
{default_port_device(0x0af0, 0x6771)},
{default_port_device(0x0af0, 0x6791)},
{default_port_device(0x0af0, 0x6811)},
{default_port_device(0x0af0, 0x6911)},
{default_port_device(0x0af0, 0x6951)},
{default_port_device(0x0af0, 0x6971)},
{default_port_device(0x0af0, 0x7011)},
{default_port_device(0x0af0, 0x7031)},
{default_port_device(0x0af0, 0x7051)},
{default_port_device(0x0af0, 0x7071)},
{default_port_device(0x0af0, 0x7111)},
{default_port_device(0x0af0, 0x7211)},
{default_port_device(0x0af0, 0x7251)},
{default_port_device(0x0af0, 0x7271)},
{default_port_device(0x0af0, 0x7311)},
{default_port_device(0x0af0, 0xc031)}, /* Icon-Edge */
{icon321_port_device(0x0af0, 0xd013)}, /* Module HSxPA */
{icon321_port_device(0x0af0, 0xd031)}, /* Icon-321 */
{icon321_port_device(0x0af0, 0xd033)}, /* Icon-322 */
{USB_DEVICE(0x0af0, 0x7301)}, /* GE40x */
{USB_DEVICE(0x0af0, 0x7361)}, /* GE40x */
{USB_DEVICE(0x0af0, 0x7401)}, /* GI 0401 */
{USB_DEVICE(0x0af0, 0x7501)}, /* GTM 382 */
{USB_DEVICE(0x0af0, 0x7601)}, /* GE40x */
{USB_DEVICE(0x0af0, 0x7701)},
{USB_DEVICE(0x0af0, 0x7801)},
{USB_DEVICE(0x0af0, 0x7901)},
{USB_DEVICE(0x0af0, 0x7361)},
{icon321_port_device(0x0af0, 0xd051)},
{}
};
MODULE_DEVICE_TABLE(usb, hso_ids);
/* Sysfs attribute */
static ssize_t hso_sysfs_show_porttype(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hso_device *hso_dev = dev->driver_data;
char *port_name;
if (!hso_dev)
return 0;
switch (hso_dev->port_spec & HSO_PORT_MASK) {
case HSO_PORT_CONTROL:
port_name = "Control";
break;
case HSO_PORT_APP:
port_name = "Application";
break;
case HSO_PORT_APP2:
port_name = "Application2";
break;
case HSO_PORT_GPS:
port_name = "GPS";
break;
case HSO_PORT_GPS_CONTROL:
port_name = "GPS Control";
break;
case HSO_PORT_PCSC:
port_name = "PCSC";
break;
case HSO_PORT_DIAG:
port_name = "Diagnostic";
break;
case HSO_PORT_DIAG2:
port_name = "Diagnostic2";
break;
case HSO_PORT_MODEM:
port_name = "Modem";
break;
case HSO_PORT_NETWORK:
port_name = "Network";
break;
default:
port_name = "Unknown";
break;
}
return sprintf(buf, "%s\n", port_name);
}
static DEVICE_ATTR(hsotype, S_IRUGO, hso_sysfs_show_porttype, NULL);
static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
{
int idx;
for (idx = 0; idx < serial->num_rx_urbs; idx++)
if (serial->rx_urb[idx] == urb)
return idx;
dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
return -1;
}
/* converts mux value to a port spec value */
static u32 hso_mux_to_port(int mux)
{
u32 result;
switch (mux) {
case 0x1:
result = HSO_PORT_CONTROL;
break;
case 0x2:
result = HSO_PORT_APP;
break;
case 0x4:
result = HSO_PORT_PCSC;
break;
case 0x8:
result = HSO_PORT_GPS;
break;
case 0x10:
result = HSO_PORT_APP2;
break;
default:
result = HSO_PORT_NO_PORT;
}
return result;
}
/* converts port spec value to a mux value */
static u32 hso_port_to_mux(int port)
{
u32 result;
switch (port & HSO_PORT_MASK) {
case HSO_PORT_CONTROL:
result = 0x0;
break;
case HSO_PORT_APP:
result = 0x1;
break;
case HSO_PORT_PCSC:
result = 0x2;
break;
case HSO_PORT_GPS:
result = 0x3;
break;
case HSO_PORT_APP2:
result = 0x4;
break;
default:
result = 0x0;
}
return result;
}
static struct hso_serial *get_serial_by_shared_int_and_type(
struct hso_shared_int *shared_int,
int mux)
{
int i, port;
port = hso_mux_to_port(mux);
for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
if (serial_table[i]
&& (dev2ser(serial_table[i])->shared_int == shared_int)
&& ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
return dev2ser(serial_table[i]);
}
}
return NULL;
}
static struct hso_serial *get_serial_by_index(unsigned index)
{
struct hso_serial *serial = NULL;
unsigned long flags;
spin_lock_irqsave(&serial_table_lock, flags);
if (serial_table[index])
serial = dev2ser(serial_table[index]);
spin_unlock_irqrestore(&serial_table_lock, flags);
return serial;
}
static int get_free_serial_index(void)
{
int index;
unsigned long flags;
spin_lock_irqsave(&serial_table_lock, flags);
for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
if (serial_table[index] == NULL) {
spin_unlock_irqrestore(&serial_table_lock, flags);
return index;
}
}
spin_unlock_irqrestore(&serial_table_lock, flags);
printk(KERN_ERR "%s: no free serial devices in table\n", __func__);
return -1;
}
static void set_serial_by_index(unsigned index, struct hso_serial *serial)
{
unsigned long flags;
spin_lock_irqsave(&serial_table_lock, flags);
if (serial)
serial_table[index] = serial->parent;
else
serial_table[index] = NULL;
spin_unlock_irqrestore(&serial_table_lock, flags);
}
/* log a meaningful explanation of an USB status */
static void log_usb_status(int status, const char *function)
{
char *explanation;
switch (status) {
case -ENODEV:
explanation = "no device";
break;
case -ENOENT:
explanation = "endpoint not enabled";
break;
case -EPIPE:
explanation = "endpoint stalled";
break;
case -ENOSPC:
explanation = "not enough bandwidth";
break;
case -ESHUTDOWN:
explanation = "device disabled";
break;
case -EHOSTUNREACH:
explanation = "device suspended";
break;
case -EINVAL:
case -EAGAIN:
case -EFBIG:
case -EMSGSIZE:
explanation = "internal error";
break;
default:
explanation = "unknown status";
break;
}
D1("%s: received USB status - %s (%d)", function, explanation, status);
}
/* Network interface functions */
/* called when net interface is brought up by ifconfig */
static int hso_net_open(struct net_device *net)
{
struct hso_net *odev = netdev_priv(net);
unsigned long flags = 0;
if (!odev) {
dev_err(&net->dev, "No net device !\n");
return -ENODEV;
}
odev->skb_tx_buf = NULL;
/* setup environment */
spin_lock_irqsave(&odev->net_lock, flags);
odev->rx_parse_state = WAIT_IP;
odev->rx_buf_size = 0;
odev->rx_buf_missing = sizeof(struct iphdr);
spin_unlock_irqrestore(&odev->net_lock, flags);
/* We are up and running. */
set_bit(HSO_NET_RUNNING, &odev->flags);
hso_start_net_device(odev->parent);
/* Tell the kernel we are ready to start receiving from it */
netif_start_queue(net);
return 0;
}
/* called when interface is brought down by ifconfig */
static int hso_net_close(struct net_device *net)
{
struct hso_net *odev = netdev_priv(net);
/* we don't need the queue anymore */
netif_stop_queue(net);
/* no longer running */
clear_bit(HSO_NET_RUNNING, &odev->flags);
hso_stop_net_device(odev->parent);
/* done */
return 0;
}
/* USB tells is xmit done, we should start the netqueue again */
static void write_bulk_callback(struct urb *urb)
{
struct hso_net *odev = urb->context;
int status = urb->status;
/* Sanity check */
if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
return;
}
/* Do we still have a valid kernel network device? */
if (!netif_device_present(odev->net)) {
dev_err(&urb->dev->dev, "%s: net device not present\n",
__func__);
return;
}
/* log status, but don't act on it, we don't need to resubmit anything
* anyhow */
if (status)
log_usb_status(status, __func__);
hso_put_activity(odev->parent);
/* Tell the network interface we are ready for another frame */
netif_wake_queue(odev->net);
}
/* called by kernel when we need to transmit a packet */
static int hso_net_start_xmit(struct sk_buff *skb, struct net_device *net)
{
struct hso_net *odev = netdev_priv(net);
int result;
/* Tell the kernel, "No more frames 'til we are done with this one." */
netif_stop_queue(net);
if (hso_get_activity(odev->parent) == -EAGAIN) {
odev->skb_tx_buf = skb;
return 0;
}
/* log if asked */
DUMP1(skb->data, skb->len);
/* Copy it from kernel memory to OUR memory */
memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
D1("len: %d/%d", skb->len, MUX_BULK_TX_BUF_SIZE);
/* Fill in the URB for shipping it out. */
usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
odev->parent->usb,
usb_sndbulkpipe(odev->parent->usb,
odev->out_endp->
bEndpointAddress & 0x7F),
odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
odev);
/* Deal with the Zero Length packet problem, I hope */
odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
/* Send the URB on its merry way. */
result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
if (result) {
dev_warn(&odev->parent->interface->dev,
"failed mux_bulk_tx_urb %d", result);
net->stats.tx_errors++;
netif_start_queue(net);
} else {
net->stats.tx_packets++;
net->stats.tx_bytes += skb->len;
/* And tell the kernel when the last transmit started. */
net->trans_start = jiffies;
}
dev_kfree_skb(skb);
/* we're done */
return result;
}
static void hso_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
{
struct hso_net *odev = netdev_priv(net);
strncpy(info->driver, driver_name, ETHTOOL_BUSINFO_LEN);
strncpy(info->version, DRIVER_VERSION, ETHTOOL_BUSINFO_LEN);
usb_make_path(odev->parent->usb, info->bus_info, sizeof info->bus_info);
}
static struct ethtool_ops ops = {
.get_drvinfo = hso_get_drvinfo,
.get_link = ethtool_op_get_link
};
/* called when a packet did not ack after watchdogtimeout */
static void hso_net_tx_timeout(struct net_device *net)
{
struct hso_net *odev = netdev_priv(net);
if (!odev)
return;
/* Tell syslog we are hosed. */
dev_warn(&net->dev, "Tx timed out.\n");
/* Tear the waiting frame off the list */
if (odev->mux_bulk_tx_urb
&& (odev->mux_bulk_tx_urb->status == -EINPROGRESS))
usb_unlink_urb(odev->mux_bulk_tx_urb);
/* Update statistics */
net->stats.tx_errors++;
}
/* make a real packet from the received USB buffer */
static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
unsigned int count, unsigned char is_eop)
{
unsigned short temp_bytes;
unsigned short buffer_offset = 0;
unsigned short frame_len;
unsigned char *tmp_rx_buf;
/* log if needed */
D1("Rx %d bytes", count);
DUMP(ip_pkt, min(128, (int)count));
while (count) {
switch (odev->rx_parse_state) {
case WAIT_IP:
/* waiting for IP header. */
/* wanted bytes - size of ip header */
temp_bytes =
(count <
odev->rx_buf_missing) ? count : odev->
rx_buf_missing;
memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
odev->rx_buf_size, ip_pkt + buffer_offset,
temp_bytes);
odev->rx_buf_size += temp_bytes;
buffer_offset += temp_bytes;
odev->rx_buf_missing -= temp_bytes;
count -= temp_bytes;
if (!odev->rx_buf_missing) {
/* header is complete allocate an sk_buffer and
* continue to WAIT_DATA */
frame_len = ntohs(odev->rx_ip_hdr.tot_len);
if ((frame_len > DEFAULT_MRU) ||
(frame_len < sizeof(struct iphdr))) {
dev_err(&odev->net->dev,
"Invalid frame (%d) length\n",
frame_len);
odev->rx_parse_state = WAIT_SYNC;
continue;
}
/* Allocate an sk_buff */
odev->skb_rx_buf = dev_alloc_skb(frame_len);
if (!odev->skb_rx_buf) {
/* We got no receive buffer. */
D1("could not allocate memory");
odev->rx_parse_state = WAIT_SYNC;
return;
}
/* Here's where it came from */
odev->skb_rx_buf->dev = odev->net;
/* Copy what we got so far. make room for iphdr
* after tail. */
tmp_rx_buf =
skb_put(odev->skb_rx_buf,
sizeof(struct iphdr));
memcpy(tmp_rx_buf, (char *)&(odev->rx_ip_hdr),
sizeof(struct iphdr));
/* ETH_HLEN */
odev->rx_buf_size = sizeof(struct iphdr);
/* Filip actually use .tot_len */
odev->rx_buf_missing =
frame_len - sizeof(struct iphdr);
odev->rx_parse_state = WAIT_DATA;
}
break;
case WAIT_DATA:
temp_bytes = (count < odev->rx_buf_missing)
? count : odev->rx_buf_missing;
/* Copy the rest of the bytes that are left in the
* buffer into the waiting sk_buf. */
/* Make room for temp_bytes after tail. */
tmp_rx_buf = skb_put(odev->skb_rx_buf, temp_bytes);
memcpy(tmp_rx_buf, ip_pkt + buffer_offset, temp_bytes);
odev->rx_buf_missing -= temp_bytes;
count -= temp_bytes;
buffer_offset += temp_bytes;
odev->rx_buf_size += temp_bytes;
if (!odev->rx_buf_missing) {
/* Packet is complete. Inject into stack. */
/* We have IP packet here */
odev->skb_rx_buf->protocol =
__constant_htons(ETH_P_IP);
/* don't check it */
odev->skb_rx_buf->ip_summed =
CHECKSUM_UNNECESSARY;
skb_reset_mac_header(odev->skb_rx_buf);
/* Ship it off to the kernel */
netif_rx(odev->skb_rx_buf);
/* No longer our buffer. */
odev->skb_rx_buf = NULL;
/* update out statistics */
odev->net->stats.rx_packets++;
odev->net->stats.rx_bytes += odev->rx_buf_size;
odev->rx_buf_size = 0;
odev->rx_buf_missing = sizeof(struct iphdr);
odev->rx_parse_state = WAIT_IP;
}
break;
case WAIT_SYNC:
D1(" W_S");
count = 0;
break;
default:
D1(" ");
count--;
break;
}
}
/* Recovery mechanism for WAIT_SYNC state. */
if (is_eop) {
if (odev->rx_parse_state == WAIT_SYNC) {
odev->rx_parse_state = WAIT_IP;
odev->rx_buf_size = 0;
odev->rx_buf_missing = sizeof(struct iphdr);
}
}
}
/* Moving data from usb to kernel (in interrupt state) */
static void read_bulk_callback(struct urb *urb)
{
struct hso_net *odev = urb->context;
struct net_device *net;
int result;
int status = urb->status;
/* is al ok? (Filip: Who's Al ?) */
if (status) {
log_usb_status(status, __func__);
return;
}
/* Sanity check */
if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
D1("BULK IN callback but driver is not active!");
return;
}
usb_mark_last_busy(urb->dev);
net = odev->net;
if (!netif_device_present(net)) {
/* Somebody killed our network interface... */
return;
}
if (odev->parent->port_spec & HSO_INFO_CRC_BUG) {
u32 rest;
u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
rest = urb->actual_length % odev->in_endp->wMaxPacketSize;
if (((rest == 5) || (rest == 6))
&& !memcmp(((u8 *) urb->transfer_buffer) +
urb->actual_length - 4, crc_check, 4)) {
urb->actual_length -= 4;
}
}
/* do we even have a packet? */
if (urb->actual_length) {
/* Handle the IP stream, add header and push it onto network
* stack if the packet is complete. */
spin_lock(&odev->net_lock);
packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
(urb->transfer_buffer_length >
urb->actual_length) ? 1 : 0);
spin_unlock(&odev->net_lock);
}
/* We are done with this URB, resubmit it. Prep the USB to wait for
* another frame. Reuse same as received. */
usb_fill_bulk_urb(urb,
odev->parent->usb,
usb_rcvbulkpipe(odev->parent->usb,
odev->in_endp->
bEndpointAddress & 0x7F),
urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
read_bulk_callback, odev);
/* Give this to the USB subsystem so it can tell us when more data
* arrives. */
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result)
dev_warn(&odev->parent->interface->dev,
"%s failed submit mux_bulk_rx_urb %d", __func__,
result);
}
/* Serial driver functions */
static void hso_init_termios(struct ktermios *termios)
{
/*
* The default requirements for this device are:
*/
termios->c_iflag &=
~(IGNBRK /* disable ignore break */
| BRKINT /* disable break causes interrupt */
| PARMRK /* disable mark parity errors */
| ISTRIP /* disable clear high bit of input characters */
| INLCR /* disable translate NL to CR */
| IGNCR /* disable ignore CR */
| ICRNL /* disable translate CR to NL */
| IXON); /* disable enable XON/XOFF flow control */
/* disable postprocess output characters */
termios->c_oflag &= ~OPOST;
termios->c_lflag &=
~(ECHO /* disable echo input characters */
| ECHONL /* disable echo new line */
| ICANON /* disable erase, kill, werase, and rprnt
special characters */
| ISIG /* disable interrupt, quit, and suspend special
characters */
| IEXTEN); /* disable non-POSIX special characters */
termios->c_cflag &=
~(CSIZE /* no size */
| PARENB /* disable parity bit */
| CBAUD /* clear current baud rate */
| CBAUDEX); /* clear current buad rate */
termios->c_cflag |= CS8; /* character size 8 bits */
/* baud rate 115200 */
tty_termios_encode_baud_rate(termios, 115200, 115200);
}
static void _hso_serial_set_termios(struct tty_struct *tty,
struct ktermios *old)
{
struct hso_serial *serial = get_serial_by_tty(tty);
struct ktermios *termios;
if (!serial) {
printk(KERN_ERR "%s: no tty structures", __func__);
return;
}
D4("port %d", serial->minor);
/*
* Fix up unsupported bits
*/
termios = tty->termios;
termios->c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
termios->c_cflag &=
~(CSIZE /* no size */
| PARENB /* disable parity bit */
| CBAUD /* clear current baud rate */
| CBAUDEX); /* clear current buad rate */
termios->c_cflag |= CS8; /* character size 8 bits */
/* baud rate 115200 */
tty_encode_baud_rate(tty, 115200, 115200);
}
static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
{
int result;
#ifdef CONFIG_HSO_AUTOPM
usb_mark_last_busy(urb->dev);
#endif
/* We are done with this URB, resubmit it. Prep the USB to wait for
* another frame */
usb_fill_bulk_urb(urb, serial->parent->usb,
usb_rcvbulkpipe(serial->parent->usb,
serial->in_endp->
bEndpointAddress & 0x7F),
urb->transfer_buffer, serial->rx_data_length,
hso_std_serial_read_bulk_callback, serial);
/* Give this to the USB subsystem so it can tell us when more data
* arrives. */
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result) {
dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
__func__, result);
}
}
static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
{
int count;
struct urb *curr_urb;
while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
count = put_rxbuf_data(curr_urb, serial);
if (count == -1)
return;
if (count == 0) {
serial->curr_rx_urb_idx++;
if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
serial->curr_rx_urb_idx = 0;
hso_resubmit_rx_bulk_urb(serial, curr_urb);
}
}
}
static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
{
int count = 0;
struct urb *urb;
urb = serial->rx_urb[0];
if (serial->open_count > 0) {
count = put_rxbuf_data(urb, serial);
if (count == -1)
return;
}
/* Re issue a read as long as we receive data. */
if (count == 0 && ((urb->actual_length != 0) ||
(serial->rx_state == RX_PENDING))) {
serial->rx_state = RX_SENT;
hso_mux_serial_read(serial);
} else
serial->rx_state = RX_IDLE;
}
/* read callback for Diag and CS port */
static void hso_std_serial_read_bulk_callback(struct urb *urb)
{
struct hso_serial *serial = urb->context;
int status = urb->status;
/* sanity check */
if (!serial) {
D1("serial == NULL");
return;
} else if (status) {
log_usb_status(status, __func__);
return;
}
D4("\n--- Got serial_read_bulk callback %02x ---", status);
D1("Actual length = %d\n", urb->actual_length);
DUMP1(urb->transfer_buffer, urb->actual_length);
/* Anyone listening? */
if (serial->open_count == 0)
return;
if (status == 0) {
if (serial->parent->port_spec & HSO_INFO_CRC_BUG) {
u32 rest;
u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
rest =
urb->actual_length %
serial->in_endp->wMaxPacketSize;
if (((rest == 5) || (rest == 6))
&& !memcmp(((u8 *) urb->transfer_buffer) +
urb->actual_length - 4, crc_check, 4)) {
urb->actual_length -= 4;
}
}
/* Valid data, handle RX data */
spin_lock(&serial->serial_lock);
serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
put_rxbuf_data_and_resubmit_bulk_urb(serial);
spin_unlock(&serial->serial_lock);
} else if (status == -ENOENT || status == -ECONNRESET) {
/* Unlinked - check for throttled port. */
D2("Port %d, successfully unlinked urb", serial->minor);
spin_lock(&serial->serial_lock);
serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
hso_resubmit_rx_bulk_urb(serial, urb);
spin_unlock(&serial->serial_lock);
} else {
D2("Port %d, status = %d for read urb", serial->minor, status);
return;
}
}
/*
* This needs to be a tasklet otherwise we will
* end up recursively calling this function.
*/
void hso_unthrottle_tasklet(struct hso_serial *serial)
{
unsigned long flags;
spin_lock_irqsave(&serial->serial_lock, flags);
if ((serial->parent->port_spec & HSO_INTF_MUX))
put_rxbuf_data_and_resubmit_ctrl_urb(serial);
else
put_rxbuf_data_and_resubmit_bulk_urb(serial);
spin_unlock_irqrestore(&serial->serial_lock, flags);
}
static void hso_unthrottle(struct tty_struct *tty)
{
struct hso_serial *serial = get_serial_by_tty(tty);
tasklet_hi_schedule(&serial->unthrottle_tasklet);
}
void hso_unthrottle_workfunc(struct work_struct *work)
{
struct hso_serial *serial =
container_of(work, struct hso_serial,
retry_unthrottle_workqueue);
hso_unthrottle_tasklet(serial);
}
/* open the requested serial port */
static int hso_serial_open(struct tty_struct *tty, struct file *filp)
{
struct hso_serial *serial = get_serial_by_index(tty->index);
int result;
/* sanity check */
if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
WARN_ON(1);
tty->driver_data = NULL;
D1("Failed to open port");
return -ENODEV;
}
mutex_lock(&serial->parent->mutex);
result = usb_autopm_get_interface(serial->parent->interface);
if (result < 0)
goto err_out;
D1("Opening %d", serial->minor);
kref_get(&serial->parent->ref);
/* setup */
spin_lock_irq(&serial->serial_lock);
tty->driver_data = serial;
serial->tty = tty_kref_get(tty);
spin_unlock_irq(&serial->serial_lock);
/* check for port already opened, if not set the termios */
serial->open_count++;
if (serial->open_count == 1) {
tty->low_latency = 1;
serial->rx_state = RX_IDLE;
/* Force default termio settings */
_hso_serial_set_termios(tty, NULL);
tasklet_init(&serial->unthrottle_tasklet,
(void (*)(unsigned long))hso_unthrottle_tasklet,
(unsigned long)serial);
INIT_WORK(&serial->retry_unthrottle_workqueue,
hso_unthrottle_workfunc);
result = hso_start_serial_device(serial->parent, GFP_KERNEL);
if (result) {
hso_stop_serial_device(serial->parent);
serial->open_count--;
kref_put(&serial->parent->ref, hso_serial_ref_free);
}
} else {
D1("Port was already open");
}
usb_autopm_put_interface(serial->parent->interface);
/* done */
if (result)
hso_serial_tiocmset(tty, NULL, TIOCM_RTS | TIOCM_DTR, 0);
err_out:
mutex_unlock(&serial->parent->mutex);
return result;
}
/* close the requested serial port */
static void hso_serial_close(struct tty_struct *tty, struct file *filp)
{
struct hso_serial *serial = tty->driver_data;
u8 usb_gone;
D1("Closing serial port");
/* Open failed, no close cleanup required */
if (serial == NULL)
return;
mutex_lock(&serial->parent->mutex);
usb_gone = serial->parent->usb_gone;
if (!usb_gone)
usb_autopm_get_interface(serial->parent->interface);
/* reset the rts and dtr */
/* do the actual close */
serial->open_count--;
kref_put(&serial->parent->ref, hso_serial_ref_free);
if (serial->open_count <= 0) {
serial->open_count = 0;
spin_lock_irq(&serial->serial_lock);
if (serial->tty == tty) {
serial->tty->driver_data = NULL;
serial->tty = NULL;
tty_kref_put(tty);
}
spin_unlock_irq(&serial->serial_lock);
if (!usb_gone)
hso_stop_serial_device(serial->parent);
tasklet_kill(&serial->unthrottle_tasklet);
cancel_work_sync(&serial->retry_unthrottle_workqueue);
}
if (!usb_gone)
usb_autopm_put_interface(serial->parent->interface);
mutex_unlock(&serial->parent->mutex);
}
/* close the requested serial port */
static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
int count)
{
struct hso_serial *serial = get_serial_by_tty(tty);
int space, tx_bytes;
unsigned long flags;
/* sanity check */
if (serial == NULL) {
printk(KERN_ERR "%s: serial is NULL\n", __func__);
return -ENODEV;
}
spin_lock_irqsave(&serial->serial_lock, flags);
space = serial->tx_data_length - serial->tx_buffer_count;
tx_bytes = (count < space) ? count : space;
if (!tx_bytes)
goto out;
memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
serial->tx_buffer_count += tx_bytes;
out:
spin_unlock_irqrestore(&serial->serial_lock, flags);
hso_kick_transmit(serial);
/* done */
return tx_bytes;
}
/* how much room is there for writing */
static int hso_serial_write_room(struct tty_struct *tty)
{
struct hso_serial *serial = get_serial_by_tty(tty);
int room;
unsigned long flags;
spin_lock_irqsave(&serial->serial_lock, flags);
room = serial->tx_data_length - serial->tx_buffer_count;
spin_unlock_irqrestore(&serial->serial_lock, flags);
/* return free room */
return room;
}
/* setup the term */
static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
{
struct hso_serial *serial = get_serial_by_tty(tty);
unsigned long flags;
if (old)
D5("Termios called with: cflags new[%d] - old[%d]",
tty->termios->c_cflag, old->c_cflag);
/* the actual setup */
spin_lock_irqsave(&serial->serial_lock, flags);
if (serial->open_count)
_hso_serial_set_termios(tty, old);
else
tty->termios = old;
spin_unlock_irqrestore(&serial->serial_lock, flags);
/* done */
return;
}
/* how many characters in the buffer */
static int hso_serial_chars_in_buffer(struct tty_struct *tty)
{
struct hso_serial *serial = get_serial_by_tty(tty);
int chars;
unsigned long flags;
/* sanity check */
if (serial == NULL)
return 0;
spin_lock_irqsave(&serial->serial_lock, flags);
chars = serial->tx_buffer_count;
spin_unlock_irqrestore(&serial->serial_lock, flags);
return chars;
}
int tiocmget_submit_urb(struct hso_serial *serial,
struct hso_tiocmget *tiocmget,
struct usb_device *usb)
{
int result;
if (serial->parent->usb_gone)
return -ENODEV;
usb_fill_int_urb(tiocmget->urb, usb,
usb_rcvintpipe(usb,
tiocmget->endp->
bEndpointAddress & 0x7F),
&tiocmget->serial_state_notification,
sizeof(struct hso_serial_state_notification),
tiocmget_intr_callback, serial,
tiocmget->endp->bInterval);
result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
if (result) {
dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
result);
}
return result;
}
static void tiocmget_intr_callback(struct urb *urb)
{
struct hso_serial *serial = urb->context;
struct hso_tiocmget *tiocmget;
int status = urb->status;
u16 UART_state_bitmap, prev_UART_state_bitmap;
struct uart_icount *icount;
struct hso_serial_state_notification *serial_state_notification;
struct usb_device *usb;
/* Sanity checks */
if (!serial)
return;
if (status) {
log_usb_status(status, __func__);
return;
}
tiocmget = serial->tiocmget;
if (!tiocmget)
return;
usb = serial->parent->usb;
serial_state_notification = &tiocmget->serial_state_notification;
if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
serial_state_notification->bNotification != B_NOTIFICATION ||
le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
le16_to_cpu(serial_state_notification->wIndex) != W_INDEX ||
le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
dev_warn(&usb->dev,
"hso received invalid serial state notification\n");
DUMP(serial_state_notification,
sizeof(hso_serial_state_notifation))
} else {
UART_state_bitmap = le16_to_cpu(serial_state_notification->
UART_state_bitmap);
prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
icount = &tiocmget->icount;
spin_lock(&serial->serial_lock);
if ((UART_state_bitmap & B_OVERRUN) !=
(prev_UART_state_bitmap & B_OVERRUN))
icount->parity++;
if ((UART_state_bitmap & B_PARITY) !=
(prev_UART_state_bitmap & B_PARITY))
icount->parity++;
if ((UART_state_bitmap & B_FRAMING) !=
(prev_UART_state_bitmap & B_FRAMING))
icount->frame++;
if ((UART_state_bitmap & B_RING_SIGNAL) &&
!(prev_UART_state_bitmap & B_RING_SIGNAL))
icount->rng++;
if ((UART_state_bitmap & B_BREAK) !=
(prev_UART_state_bitmap & B_BREAK))
icount->brk++;
if ((UART_state_bitmap & B_TX_CARRIER) !=
(prev_UART_state_bitmap & B_TX_CARRIER))
icount->dsr++;
if ((UART_state_bitmap & B_RX_CARRIER) !=
(prev_UART_state_bitmap & B_RX_CARRIER))
icount->dcd++;
tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
spin_unlock(&serial->serial_lock);
tiocmget->intr_completed = 1;
wake_up_interruptible(&tiocmget->waitq);
}
memset(serial_state_notification, 0,
sizeof(struct hso_serial_state_notification));
tiocmget_submit_urb(serial,
tiocmget,
serial->parent->usb);
}
/*
* next few functions largely stolen from drivers/serial/serial_core.c
*/
/* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
* - mask passed in arg for lines of interest
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
* Caller should use TIOCGICOUNT to see which one it was
*/
static int
hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
{
DECLARE_WAITQUEUE(wait, current);
struct uart_icount cprev, cnow;
struct hso_tiocmget *tiocmget;
int ret;
tiocmget = serial->tiocmget;
if (!tiocmget)
return -ENOENT;
/*
* note the counters on entry
*/
spin_lock_irq(&serial->serial_lock);
memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
spin_unlock_irq(&serial->serial_lock);
add_wait_queue(&tiocmget->waitq, &wait);
for (;;) {
spin_lock_irq(&serial->serial_lock);
memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
spin_unlock_irq(&serial->serial_lock);
set_current_state(TASK_INTERRUPTIBLE);
if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd))) {
ret = 0;
break;
}
schedule();
/* see if a signal did it */
if (signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
cprev = cnow;
}
current->state = TASK_RUNNING;
remove_wait_queue(&tiocmget->waitq, &wait);
return ret;
}
/*
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
* Return: write counters to the user passed counter struct
* NB: both 1->0 and 0->1 transitions are counted except for
* RI where only 0->1 is counted.
*/
static int hso_get_count(struct hso_serial *serial,
struct serial_icounter_struct __user *icnt)
{
struct serial_icounter_struct icount;
struct uart_icount cnow;
struct hso_tiocmget *tiocmget = serial->tiocmget;
if (!tiocmget)
return -ENOENT;
spin_lock_irq(&serial->serial_lock);
memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
spin_unlock_irq(&serial->serial_lock);
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;
icount.dcd = cnow.dcd;
icount.rx = cnow.rx;
icount.tx = cnow.tx;
icount.frame = cnow.frame;
icount.overrun = cnow.overrun;
icount.parity = cnow.parity;
icount.brk = cnow.brk;
icount.buf_overrun = cnow.buf_overrun;
return copy_to_user(icnt, &icount, sizeof(icount)) ? -EFAULT : 0;
}
static int hso_serial_tiocmget(struct tty_struct *tty, struct file *file)
{
int retval;
struct hso_serial *serial = get_serial_by_tty(tty);
struct hso_tiocmget *tiocmget;
u16 UART_state_bitmap;
/* sanity check */
if (!serial) {
D1("no tty structures");
return -EINVAL;
}
spin_lock_irq(&serial->serial_lock);
retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
((serial->dtr_state) ? TIOCM_DTR : 0);
tiocmget = serial->tiocmget;
if (tiocmget) {
UART_state_bitmap = le16_to_cpu(
tiocmget->prev_UART_state_bitmap);
if (UART_state_bitmap & B_RING_SIGNAL)
retval |= TIOCM_RNG;
if (UART_state_bitmap & B_RX_CARRIER)
retval |= TIOCM_CD;
if (UART_state_bitmap & B_TX_CARRIER)
retval |= TIOCM_DSR;
}
spin_unlock_irq(&serial->serial_lock);
return retval;
}
static int hso_serial_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
int val = 0;
unsigned long flags;
int if_num;
struct hso_serial *serial = get_serial_by_tty(tty);
/* sanity check */
if (!serial) {
D1("no tty structures");
return -EINVAL;
}
if_num = serial->parent->interface->altsetting->desc.bInterfaceNumber;
spin_lock_irqsave(&serial->serial_lock, flags);
if (set & TIOCM_RTS)
serial->rts_state = 1;
if (set & TIOCM_DTR)
serial->dtr_state = 1;
if (clear & TIOCM_RTS)
serial->rts_state = 0;
if (clear & TIOCM_DTR)
serial->dtr_state = 0;
if (serial->dtr_state)
val |= 0x01;
if (serial->rts_state)
val |= 0x02;
spin_unlock_irqrestore(&serial->serial_lock, flags);
return usb_control_msg(serial->parent->usb,
usb_rcvctrlpipe(serial->parent->usb, 0), 0x22,
0x21, val, if_num, NULL, 0,
USB_CTRL_SET_TIMEOUT);
}
static int hso_serial_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct hso_serial *serial = get_serial_by_tty(tty);
void __user *uarg = (void __user *)arg;
int ret = 0;
D4("IOCTL cmd: %d, arg: %ld", cmd, arg);
if (!serial)
return -ENODEV;
switch (cmd) {
case TIOCMIWAIT:
ret = hso_wait_modem_status(serial, arg);
break;
case TIOCGICOUNT:
ret = hso_get_count(serial, uarg);
break;
default:
ret = -ENOIOCTLCMD;
break;
}
return ret;
}
/* starts a transmit */
static void hso_kick_transmit(struct hso_serial *serial)
{
u8 *temp;
unsigned long flags;
int res;
spin_lock_irqsave(&serial->serial_lock, flags);
if (!serial->tx_buffer_count)
goto out;
if (serial->tx_urb_used)
goto out;
/* Wakeup USB interface if necessary */
if (hso_get_activity(serial->parent) == -EAGAIN)
goto out;
/* Switch pointers around to avoid memcpy */
temp = serial->tx_buffer;
serial->tx_buffer = serial->tx_data;
serial->tx_data = temp;
serial->tx_data_count = serial->tx_buffer_count;
serial->tx_buffer_count = 0;
/* If temp is set, it means we switched buffers */
if (temp && serial->write_data) {
res = serial->write_data(serial);
if (res >= 0)
serial->tx_urb_used = 1;
}
out:
spin_unlock_irqrestore(&serial->serial_lock, flags);
}
/* make a request (for reading and writing data to muxed serial port) */
static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
struct urb *ctrl_urb,
struct usb_ctrlrequest *ctrl_req,
u8 *ctrl_urb_data, u32 size)
{
int result;
int pipe;
/* Sanity check */
if (!serial || !ctrl_urb || !ctrl_req) {
printk(KERN_ERR "%s: Wrong arguments\n", __func__);
return -EINVAL;
}
/* initialize */
ctrl_req->wValue = 0;
ctrl_req->wIndex = hso_port_to_mux(port);
ctrl_req->wLength = size;
if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
/* Reading command */
ctrl_req->bRequestType = USB_DIR_IN |
USB_TYPE_OPTION_VENDOR |
USB_RECIP_INTERFACE;
ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
} else {
/* Writing command */
ctrl_req->bRequestType = USB_DIR_OUT |
USB_TYPE_OPTION_VENDOR |
USB_RECIP_INTERFACE;
ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
pipe = usb_sndctrlpipe(serial->parent->usb, 0);
}
/* syslog */
D2("%s command (%02x) len: %d, port: %d",
type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
ctrl_req->bRequestType, ctrl_req->wLength, port);
/* Load ctrl urb */
ctrl_urb->transfer_flags = 0;
usb_fill_control_urb(ctrl_urb,
serial->parent->usb,
pipe,
(u8 *) ctrl_req,
ctrl_urb_data, size, ctrl_callback, serial);
/* Send it on merry way */
result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
if (result) {
dev_err(&ctrl_urb->dev->dev,
"%s failed submit ctrl_urb %d type %d", __func__,
result, type);
return result;
}
/* done */
return size;
}
/* called by intr_callback when read occurs */
static int hso_mux_serial_read(struct hso_serial *serial)
{
if (!serial)
return -EINVAL;
/* clean data */
memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
/* make the request */
if (serial->num_rx_urbs != 1) {
dev_err(&serial->parent->interface->dev,
"ERROR: mux'd reads with multiple buffers "
"not possible\n");
return 0;
}
return mux_device_request(serial,
USB_CDC_GET_ENCAPSULATED_RESPONSE,
serial->parent->port_spec & HSO_PORT_MASK,
serial->rx_urb[0],
&serial->ctrl_req_rx,
serial->rx_data[0], serial->rx_data_length);
}
/* used for muxed serial port callback (muxed serial read) */
static void intr_callback(struct urb *urb)
{
struct hso_shared_int *shared_int = urb->context;
struct hso_serial *serial;
unsigned char *port_req;
int status = urb->status;
int i;
usb_mark_last_busy(urb->dev);
/* sanity check */
if (!shared_int)
return;
/* status check */
if (status) {
log_usb_status(status, __func__);
return;
}
D4("\n--- Got intr callback 0x%02X ---", status);
/* what request? */
port_req = urb->transfer_buffer;
D4(" port_req = 0x%.2X\n", *port_req);
/* loop over all muxed ports to find the one sending this */
for (i = 0; i < 8; i++) {
/* max 8 channels on MUX */
if (*port_req & (1 << i)) {
serial = get_serial_by_shared_int_and_type(shared_int,
(1 << i));
if (serial != NULL) {
D1("Pending read interrupt on port %d\n", i);
spin_lock(&serial->serial_lock);
if (serial->rx_state == RX_IDLE) {
/* Setup and send a ctrl req read on
* port i */
if (!serial->rx_urb_filled[0]) {
serial->rx_state = RX_SENT;
hso_mux_serial_read(serial);
} else
serial->rx_state = RX_PENDING;
} else {
D1("Already pending a read on "
"port %d\n", i);
}
spin_unlock(&serial->serial_lock);
}
}
}
/* Resubmit interrupt urb */
hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
}
/* called for writing to muxed serial port */
static int hso_mux_serial_write_data(struct hso_serial *serial)
{
if (NULL == serial)
return -EINVAL;
return mux_device_request(serial,
USB_CDC_SEND_ENCAPSULATED_COMMAND,
serial->parent->port_spec & HSO_PORT_MASK,
serial->tx_urb,
&serial->ctrl_req_tx,
serial->tx_data, serial->tx_data_count);
}
/* write callback for Diag and CS port */
static void hso_std_serial_write_bulk_callback(struct urb *urb)
{
struct hso_serial *serial = urb->context;
int status = urb->status;
struct tty_struct *tty;
/* sanity check */
if (!serial) {
D1("serial == NULL");
return;
}
spin_lock(&serial->serial_lock);
serial->tx_urb_used = 0;
tty = tty_kref_get(serial->tty);
spin_unlock(&serial->serial_lock);
if (status) {
log_usb_status(status, __func__);
tty_kref_put(tty);
return;
}
hso_put_activity(serial->parent);
if (tty) {
tty_wakeup(tty);
tty_kref_put(tty);
}
hso_kick_transmit(serial);
D1(" ");
return;
}
/* called for writing diag or CS serial port */
static int hso_std_serial_write_data(struct hso_serial *serial)
{
int count = serial->tx_data_count;
int result;
usb_fill_bulk_urb(serial->tx_urb,
serial->parent->usb,
usb_sndbulkpipe(serial->parent->usb,
serial->out_endp->
bEndpointAddress & 0x7F),
serial->tx_data, serial->tx_data_count,
hso_std_serial_write_bulk_callback, serial);
result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
if (result) {
dev_warn(&serial->parent->usb->dev,
"Failed to submit urb - res %d\n", result);
return result;
}
return count;
}
/* callback after read or write on muxed serial port */
static void ctrl_callback(struct urb *urb)
{
struct hso_serial *serial = urb->context;
struct usb_ctrlrequest *req;
int status = urb->status;
struct tty_struct *tty;
/* sanity check */
if (!serial)
return;
spin_lock(&serial->serial_lock);
serial->tx_urb_used = 0;
tty = tty_kref_get(serial->tty);
spin_unlock(&serial->serial_lock);
if (status) {
log_usb_status(status, __func__);
tty_kref_put(tty);
return;
}
/* what request? */
req = (struct usb_ctrlrequest *)(urb->setup_packet);
D4("\n--- Got muxed ctrl callback 0x%02X ---", status);
D4("Actual length of urb = %d\n", urb->actual_length);
DUMP1(urb->transfer_buffer, urb->actual_length);
if (req->bRequestType ==
(USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
/* response to a read command */
serial->rx_urb_filled[0] = 1;
spin_lock(&serial->serial_lock);
put_rxbuf_data_and_resubmit_ctrl_urb(serial);
spin_unlock(&serial->serial_lock);
} else {
hso_put_activity(serial->parent);
if (tty)
tty_wakeup(tty);
/* response to a write command */
hso_kick_transmit(serial);
}
tty_kref_put(tty);
}
/* handle RX data for serial port */
static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
{
struct tty_struct *tty;
int write_length_remaining = 0;
int curr_write_len;
/* Sanity check */
if (urb == NULL || serial == NULL) {
D1("serial = NULL");
return -2;
}
spin_lock(&serial->serial_lock);
tty = tty_kref_get(serial->tty);
spin_unlock(&serial->serial_lock);
/* Push data to tty */
if (tty) {
write_length_remaining = urb->actual_length -
serial->curr_rx_urb_offset;
D1("data to push to tty");
while (write_length_remaining) {
if (test_bit(TTY_THROTTLED, &tty->flags))
return -1;
curr_write_len = tty_insert_flip_string
(tty, urb->transfer_buffer +
serial->curr_rx_urb_offset,
write_length_remaining);
serial->curr_rx_urb_offset += curr_write_len;
write_length_remaining -= curr_write_len;
tty_flip_buffer_push(tty);
}
}
if (write_length_remaining == 0) {
serial->curr_rx_urb_offset = 0;
serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
}
tty_kref_put(tty);
return write_length_remaining;
}
/* Base driver functions */
static void hso_log_port(struct hso_device *hso_dev)
{
char *port_type;
char port_dev[20];
switch (hso_dev->port_spec & HSO_PORT_MASK) {
case HSO_PORT_CONTROL:
port_type = "Control";
break;
case HSO_PORT_APP:
port_type = "Application";
break;
case HSO_PORT_GPS:
port_type = "GPS";
break;
case HSO_PORT_GPS_CONTROL:
port_type = "GPS control";
break;
case HSO_PORT_APP2:
port_type = "Application2";
break;
case HSO_PORT_PCSC:
port_type = "PCSC";
break;
case HSO_PORT_DIAG:
port_type = "Diagnostic";
break;
case HSO_PORT_DIAG2:
port_type = "Diagnostic2";
break;
case HSO_PORT_MODEM:
port_type = "Modem";
break;
case HSO_PORT_NETWORK:
port_type = "Network";
break;
default:
port_type = "Unknown";
break;
}
if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
} else
sprintf(port_dev, "/dev/%s%d", tty_filename,
dev2ser(hso_dev)->minor);
dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
port_type, port_dev);
}
static int hso_start_net_device(struct hso_device *hso_dev)
{
int i, result = 0;
struct hso_net *hso_net = dev2net(hso_dev);
if (!hso_net)
return -ENODEV;
/* send URBs for all read buffers */
for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
/* Prep a receive URB */
usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
hso_dev->usb,
usb_rcvbulkpipe(hso_dev->usb,
hso_net->in_endp->
bEndpointAddress & 0x7F),
hso_net->mux_bulk_rx_buf_pool[i],
MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
hso_net);
/* Put it out there so the device can send us stuff */
result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
GFP_NOIO);
if (result)
dev_warn(&hso_dev->usb->dev,
"%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
i, result);
}
return result;
}
static int hso_stop_net_device(struct hso_device *hso_dev)
{
int i;
struct hso_net *hso_net = dev2net(hso_dev);
if (!hso_net)
return -ENODEV;
for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
if (hso_net->mux_bulk_rx_urb_pool[i])
usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
}
if (hso_net->mux_bulk_tx_urb)
usb_kill_urb(hso_net->mux_bulk_tx_urb);
return 0;
}
static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
{
int i, result = 0;
struct hso_serial *serial = dev2ser(hso_dev);
if (!serial)
return -ENODEV;
/* If it is not the MUX port fill in and submit a bulk urb (already
* allocated in hso_serial_start) */
if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
for (i = 0; i < serial->num_rx_urbs; i++) {
usb_fill_bulk_urb(serial->rx_urb[i],
serial->parent->usb,
usb_rcvbulkpipe(serial->parent->usb,
serial->in_endp->
bEndpointAddress &
0x7F),
serial->rx_data[i],
serial->rx_data_length,
hso_std_serial_read_bulk_callback,
serial);
result = usb_submit_urb(serial->rx_urb[i], flags);
if (result) {
dev_warn(&serial->parent->usb->dev,
"Failed to submit urb - res %d\n",
result);
break;
}
}
} else {
mutex_lock(&serial->shared_int->shared_int_lock);
if (!serial->shared_int->use_count) {
result =
hso_mux_submit_intr_urb(serial->shared_int,
hso_dev->usb, flags);
}
serial->shared_int->use_count++;
mutex_unlock(&serial->shared_int->shared_int_lock);
}
if (serial->tiocmget)
tiocmget_submit_urb(serial,
serial->tiocmget,
serial->parent->usb);
return result;
}
static int hso_stop_serial_device(struct hso_device *hso_dev)
{
int i;
struct hso_serial *serial = dev2ser(hso_dev);
struct hso_tiocmget *tiocmget;
if (!serial)
return -ENODEV;
for (i = 0; i < serial->num_rx_urbs; i++) {
if (serial->rx_urb[i]) {
usb_kill_urb(serial->rx_urb[i]);
serial->rx_urb_filled[i] = 0;
}
}
serial->curr_rx_urb_idx = 0;
serial->curr_rx_urb_offset = 0;
if (serial->tx_urb)
usb_kill_urb(serial->tx_urb);
if (serial->shared_int) {
mutex_lock(&serial->shared_int->shared_int_lock);
if (serial->shared_int->use_count &&
(--serial->shared_int->use_count == 0)) {
struct urb *urb;
urb = serial->shared_int->shared_intr_urb;
if (urb)
usb_kill_urb(urb);
}
mutex_unlock(&serial->shared_int->shared_int_lock);
}
tiocmget = serial->tiocmget;
if (tiocmget) {
wake_up_interruptible(&tiocmget->waitq);
usb_kill_urb(tiocmget->urb);
}
return 0;
}
static void hso_serial_common_free(struct hso_serial *serial)
{
int i;
if (serial->parent->dev)
device_remove_file(serial->parent->dev, &dev_attr_hsotype);
tty_unregister_device(tty_drv, serial->minor);
for (i = 0; i < serial->num_rx_urbs; i++) {
/* unlink and free RX URB */
usb_free_urb(serial->rx_urb[i]);
/* free the RX buffer */
kfree(serial->rx_data[i]);
}
/* unlink and free TX URB */
usb_free_urb(serial->tx_urb);
kfree(serial->tx_data);
}
static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
int rx_size, int tx_size)
{
struct device *dev;
int minor;
int i;
minor = get_free_serial_index();
if (minor < 0)
goto exit;
/* register our minor number */
serial->parent->dev = tty_register_device(tty_drv, minor,
&serial->parent->interface->dev);
dev = serial->parent->dev;
dev->driver_data = serial->parent;
i = device_create_file(dev, &dev_attr_hsotype);
/* fill in specific data for later use */
serial->minor = minor;
serial->magic = HSO_SERIAL_MAGIC;
spin_lock_init(&serial->serial_lock);
serial->num_rx_urbs = num_urbs;
/* RX, allocate urb and initialize */
/* prepare our RX buffer */
serial->rx_data_length = rx_size;
for (i = 0; i < serial->num_rx_urbs; i++) {
serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
if (!serial->rx_urb[i]) {
dev_err(dev, "Could not allocate urb?\n");
goto exit;
}
serial->rx_urb[i]->transfer_buffer = NULL;
serial->rx_urb[i]->transfer_buffer_length = 0;
serial->rx_data[i] = kzalloc(serial->rx_data_length,
GFP_KERNEL);
if (!serial->rx_data[i]) {
dev_err(dev, "%s - Out of memory\n", __func__);
goto exit;
}
}
/* TX, allocate urb and initialize */
serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!serial->tx_urb) {
dev_err(dev, "Could not allocate urb?\n");
goto exit;
}
serial->tx_urb->transfer_buffer = NULL;
serial->tx_urb->transfer_buffer_length = 0;
/* prepare our TX buffer */
serial->tx_data_count = 0;
serial->tx_buffer_count = 0;
serial->tx_data_length = tx_size;
serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
if (!serial->tx_data) {
dev_err(dev, "%s - Out of memory", __func__);
goto exit;
}
serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
if (!serial->tx_buffer) {
dev_err(dev, "%s - Out of memory", __func__);
goto exit;
}
return 0;
exit:
hso_serial_common_free(serial);
return -1;
}
/* Frees a general hso device */
static void hso_free_device(struct hso_device *hso_dev)
{
kfree(hso_dev);
}
/* Creates a general hso device */
static struct hso_device *hso_create_device(struct usb_interface *intf,
int port_spec)
{
struct hso_device *hso_dev;
hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
if (!hso_dev)
return NULL;
hso_dev->port_spec = port_spec;
hso_dev->usb = interface_to_usbdev(intf);
hso_dev->interface = intf;
kref_init(&hso_dev->ref);
mutex_init(&hso_dev->mutex);
INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
return hso_dev;
}
/* Removes a network device in the network device table */
static int remove_net_device(struct hso_device *hso_dev)
{
int i;
for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
if (network_table[i] == hso_dev) {
network_table[i] = NULL;
break;
}
}
if (i == HSO_MAX_NET_DEVICES)
return -1;
return 0;
}
/* Frees our network device */
static void hso_free_net_device(struct hso_device *hso_dev)
{
int i;
struct hso_net *hso_net = dev2net(hso_dev);
if (!hso_net)
return;
/* start freeing */
for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
kfree(hso_net->mux_bulk_rx_buf_pool[i]);
}
usb_free_urb(hso_net->mux_bulk_tx_urb);
kfree(hso_net->mux_bulk_tx_buf);
remove_net_device(hso_net->parent);
if (hso_net->net) {
unregister_netdev(hso_net->net);
free_netdev(hso_net->net);
}
hso_free_device(hso_dev);
}
/* initialize the network interface */
static void hso_net_init(struct net_device *net)
{
struct hso_net *hso_net = netdev_priv(net);
D1("sizeof hso_net is %d", (int)sizeof(*hso_net));
/* fill in the other fields */
net->open = hso_net_open;
net->stop = hso_net_close;
net->hard_start_xmit = hso_net_start_xmit;
net->tx_timeout = hso_net_tx_timeout;
net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
net->type = ARPHRD_NONE;
net->mtu = DEFAULT_MTU - 14;
net->tx_queue_len = 10;
SET_ETHTOOL_OPS(net, &ops);
/* and initialize the semaphore */
spin_lock_init(&hso_net->net_lock);
}
/* Adds a network device in the network device table */
static int add_net_device(struct hso_device *hso_dev)
{
int i;
for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
if (network_table[i] == NULL) {
network_table[i] = hso_dev;
break;
}
}
if (i == HSO_MAX_NET_DEVICES)
return -1;
return 0;
}
static int hso_radio_toggle(void *data, enum rfkill_state state)
{
struct hso_device *hso_dev = data;
int enabled = (state == RFKILL_STATE_ON);
int rv;
mutex_lock(&hso_dev->mutex);
if (hso_dev->usb_gone)
rv = 0;
else
rv = usb_control_msg(hso_dev->usb, usb_rcvctrlpipe(hso_dev->usb, 0),
enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
USB_CTRL_SET_TIMEOUT);
mutex_unlock(&hso_dev->mutex);
return rv;
}
/* Creates and sets up everything for rfkill */
static void hso_create_rfkill(struct hso_device *hso_dev,
struct usb_interface *interface)
{
struct hso_net *hso_net = dev2net(hso_dev);
struct device *dev = &hso_net->net->dev;
char *rfkn;
hso_net->rfkill = rfkill_allocate(&interface_to_usbdev(interface)->dev,
RFKILL_TYPE_WWAN);
if (!hso_net->rfkill) {
dev_err(dev, "%s - Out of memory\n", __func__);
return;
}
rfkn = kzalloc(20, GFP_KERNEL);
if (!rfkn) {
rfkill_free(hso_net->rfkill);
hso_net->rfkill = NULL;
dev_err(dev, "%s - Out of memory\n", __func__);
return;
}
snprintf(rfkn, 20, "hso-%d",
interface->altsetting->desc.bInterfaceNumber);
hso_net->rfkill->name = rfkn;
hso_net->rfkill->state = RFKILL_STATE_ON;
hso_net->rfkill->data = hso_dev;
hso_net->rfkill->toggle_radio = hso_radio_toggle;
if (rfkill_register(hso_net->rfkill) < 0) {
kfree(rfkn);
hso_net->rfkill->name = NULL;
rfkill_free(hso_net->rfkill);
hso_net->rfkill = NULL;
dev_err(dev, "%s - Failed to register rfkill\n", __func__);
return;
}
}
/* Creates our network device */
static struct hso_device *hso_create_net_device(struct usb_interface *interface)
{
int result, i;
struct net_device *net;
struct hso_net *hso_net;
struct hso_device *hso_dev;
hso_dev = hso_create_device(interface, HSO_INTF_MUX | HSO_PORT_NETWORK);
if (!hso_dev)
return NULL;
/* allocate our network device, then we can put in our private data */
/* call hso_net_init to do the basic initialization */
net = alloc_netdev(sizeof(struct hso_net), "hso%d", hso_net_init);
if (!net) {
dev_err(&interface->dev, "Unable to create ethernet device\n");
goto exit;
}
hso_net = netdev_priv(net);
hso_dev->port_data.dev_net = hso_net;
hso_net->net = net;
hso_net->parent = hso_dev;
hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
USB_DIR_IN);
if (!hso_net->in_endp) {
dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
goto exit;
}
hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
USB_DIR_OUT);
if (!hso_net->out_endp) {
dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
goto exit;
}
SET_NETDEV_DEV(net, &interface->dev);
/* registering our net device */
result = register_netdev(net);
if (result) {
dev_err(&interface->dev, "Failed to register device\n");
goto exit;
}
/* start allocating */
for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
if (!hso_net->mux_bulk_rx_urb_pool[i]) {
dev_err(&interface->dev, "Could not allocate rx urb\n");
goto exit;
}
hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
GFP_KERNEL);
if (!hso_net->mux_bulk_rx_buf_pool[i]) {
dev_err(&interface->dev, "Could not allocate rx buf\n");
goto exit;
}
}
hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!hso_net->mux_bulk_tx_urb) {
dev_err(&interface->dev, "Could not allocate tx urb\n");
goto exit;
}
hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
if (!hso_net->mux_bulk_tx_buf) {
dev_err(&interface->dev, "Could not allocate tx buf\n");
goto exit;
}
add_net_device(hso_dev);
hso_log_port(hso_dev);
hso_create_rfkill(hso_dev, interface);
return hso_dev;
exit:
hso_free_net_device(hso_dev);
return NULL;
}
static void hso_free_tiomget(struct hso_serial *serial)
{
struct hso_tiocmget *tiocmget = serial->tiocmget;
if (tiocmget) {
kfree(tiocmget);
if (tiocmget->urb) {
usb_free_urb(tiocmget->urb);
tiocmget->urb = NULL;
}
serial->tiocmget = NULL;
}
}
/* Frees an AT channel ( goes for both mux and non-mux ) */
static void hso_free_serial_device(struct hso_device *hso_dev)
{
struct hso_serial *serial = dev2ser(hso_dev);
if (!serial)
return;
set_serial_by_index(serial->minor, NULL);
hso_serial_common_free(serial);
if (serial->shared_int) {
mutex_lock(&serial->shared_int->shared_int_lock);
if (--serial->shared_int->ref_count == 0)
hso_free_shared_int(serial->shared_int);
else
mutex_unlock(&serial->shared_int->shared_int_lock);
}
hso_free_tiomget(serial);
kfree(serial);
hso_free_device(hso_dev);
}
/* Creates a bulk AT channel */
static struct hso_device *hso_create_bulk_serial_device(
struct usb_interface *interface, int port)
{
struct hso_device *hso_dev;
struct hso_serial *serial;
int num_urbs;
struct hso_tiocmget *tiocmget;
hso_dev = hso_create_device(interface, port);
if (!hso_dev)
return NULL;
serial = kzalloc(sizeof(*serial), GFP_KERNEL);
if (!serial)
goto exit;
serial->parent = hso_dev;
hso_dev->port_data.dev_serial = serial;
if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
num_urbs = 2;
serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
GFP_KERNEL);
/* it isn't going to break our heart if serial->tiocmget
* allocation fails don't bother checking this.
*/
if (serial->tiocmget) {
tiocmget = serial->tiocmget;
tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
if (tiocmget->urb) {
mutex_init(&tiocmget->mutex);
init_waitqueue_head(&tiocmget->waitq);
tiocmget->endp = hso_get_ep(
interface,
USB_ENDPOINT_XFER_INT,
USB_DIR_IN);
} else
hso_free_tiomget(serial);
}
}
else
num_urbs = 1;
if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
BULK_URB_TX_SIZE))
goto exit;
serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
USB_DIR_IN);
if (!serial->in_endp) {
dev_err(&interface->dev, "Failed to find BULK IN ep\n");
goto exit2;
}
if (!
(serial->out_endp =
hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
dev_err(&interface->dev, "Failed to find BULK IN ep\n");
goto exit2;
}
serial->write_data = hso_std_serial_write_data;
/* and record this serial */
set_serial_by_index(serial->minor, serial);
/* setup the proc dirs and files if needed */
hso_log_port(hso_dev);
/* done, return it */
return hso_dev;
exit2:
hso_serial_common_free(serial);
exit:
hso_free_tiomget(serial);
kfree(serial);
hso_free_device(hso_dev);
return NULL;
}
/* Creates a multiplexed AT channel */
static
struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
int port,
struct hso_shared_int *mux)
{
struct hso_device *hso_dev;
struct hso_serial *serial;
int port_spec;
port_spec = HSO_INTF_MUX;
port_spec &= ~HSO_PORT_MASK;
port_spec |= hso_mux_to_port(port);
if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
return NULL;
hso_dev = hso_create_device(interface, port_spec);
if (!hso_dev)
return NULL;
serial = kzalloc(sizeof(*serial), GFP_KERNEL);
if (!serial)
goto exit;
hso_dev->port_data.dev_serial = serial;
serial->parent = hso_dev;
if (hso_serial_common_create
(serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
goto exit;
serial->tx_data_length--;
serial->write_data = hso_mux_serial_write_data;
serial->shared_int = mux;
mutex_lock(&serial->shared_int->shared_int_lock);
serial->shared_int->ref_count++;
mutex_unlock(&serial->shared_int->shared_int_lock);
/* and record this serial */
set_serial_by_index(serial->minor, serial);
/* setup the proc dirs and files if needed */
hso_log_port(hso_dev);
/* done, return it */
return hso_dev;
exit:
if (serial) {
tty_unregister_device(tty_drv, serial->minor);
kfree(serial);
}
if (hso_dev)
hso_free_device(hso_dev);
return NULL;
}
static void hso_free_shared_int(struct hso_shared_int *mux)
{
usb_free_urb(mux->shared_intr_urb);
kfree(mux->shared_intr_buf);
mutex_unlock(&mux->shared_int_lock);
kfree(mux);
}
static
struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
{
struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
if (!mux)
return NULL;
mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
USB_DIR_IN);
if (!mux->intr_endp) {
dev_err(&interface->dev, "Can't find INT IN endpoint\n");
goto exit;
}
mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!mux->shared_intr_urb) {
dev_err(&interface->dev, "Could not allocate intr urb?");
goto exit;
}
mux->shared_intr_buf = kzalloc(mux->intr_endp->wMaxPacketSize,
GFP_KERNEL);
if (!mux->shared_intr_buf) {
dev_err(&interface->dev, "Could not allocate intr buf?");
goto exit;
}
mutex_init(&mux->shared_int_lock);
return mux;
exit:
kfree(mux->shared_intr_buf);
usb_free_urb(mux->shared_intr_urb);
kfree(mux);
return NULL;
}
/* Gets the port spec for a certain interface */
static int hso_get_config_data(struct usb_interface *interface)
{
struct usb_device *usbdev = interface_to_usbdev(interface);
u8 config_data[17];
u32 if_num = interface->altsetting->desc.bInterfaceNumber;
s32 result;
if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
0x86, 0xC0, 0, 0, config_data, 17,
USB_CTRL_SET_TIMEOUT) != 0x11) {
return -EIO;
}
switch (config_data[if_num]) {
case 0x0:
result = 0;
break;
case 0x1:
result = HSO_PORT_DIAG;
break;
case 0x2:
result = HSO_PORT_GPS;
break;
case 0x3:
result = HSO_PORT_GPS_CONTROL;
break;
case 0x4:
result = HSO_PORT_APP;
break;
case 0x5:
result = HSO_PORT_APP2;
break;
case 0x6:
result = HSO_PORT_CONTROL;
break;
case 0x7:
result = HSO_PORT_NETWORK;
break;
case 0x8:
result = HSO_PORT_MODEM;
break;
case 0x9:
result = HSO_PORT_MSD;
break;
case 0xa:
result = HSO_PORT_PCSC;
break;
case 0xb:
result = HSO_PORT_VOICE;
break;
default:
result = 0;
}
if (result)
result |= HSO_INTF_BULK;
if (config_data[16] & 0x1)
result |= HSO_INFO_CRC_BUG;
return result;
}
/* called once for each interface upon device insertion */
static int hso_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
int mux, i, if_num, port_spec;
unsigned char port_mask;
struct hso_device *hso_dev = NULL;
struct hso_shared_int *shared_int;
struct hso_device *tmp_dev = NULL;
if_num = interface->altsetting->desc.bInterfaceNumber;
/* Get the interface/port specification from either driver_info or from
* the device itself */
if (id->driver_info)
port_spec = ((u32 *)(id->driver_info))[if_num];
else
port_spec = hso_get_config_data(interface);
if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
dev_err(&interface->dev, "Not our interface\n");
return -ENODEV;
}
/* Check if we need to switch to alt interfaces prior to port
* configuration */
if (interface->num_altsetting > 1)
usb_set_interface(interface_to_usbdev(interface), if_num, 1);
interface->needs_remote_wakeup = 1;
/* Allocate new hso device(s) */
switch (port_spec & HSO_INTF_MASK) {
case HSO_INTF_MUX:
if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
/* Create the network device */
if (!disable_net) {
hso_dev = hso_create_net_device(interface);
if (!hso_dev)
goto exit;
tmp_dev = hso_dev;
}
}
if (hso_get_mux_ports(interface, &port_mask))
/* TODO: de-allocate everything */
goto exit;
shared_int = hso_create_shared_int(interface);
if (!shared_int)
goto exit;
for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
if (port_mask & i) {
hso_dev = hso_create_mux_serial_device(
interface, i, shared_int);
if (!hso_dev)
goto exit;
}
}
if (tmp_dev)
hso_dev = tmp_dev;
break;
case HSO_INTF_BULK:
/* It's a regular bulk interface */
if (((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK)
&& !disable_net)
hso_dev = hso_create_net_device(interface);
else
hso_dev =
hso_create_bulk_serial_device(interface, port_spec);
if (!hso_dev)
goto exit;
break;
default:
goto exit;
}
usb_driver_claim_interface(&hso_driver, interface, hso_dev);
/* save our data pointer in this device */
usb_set_intfdata(interface, hso_dev);
/* done */
return 0;
exit:
hso_free_interface(interface);
return -ENODEV;
}
/* device removed, cleaning up */
static void hso_disconnect(struct usb_interface *interface)
{
hso_free_interface(interface);
/* remove reference of our private data */
usb_set_intfdata(interface, NULL);
usb_driver_release_interface(&hso_driver, interface);
}
static void async_get_intf(struct work_struct *data)
{
struct hso_device *hso_dev =
container_of(data, struct hso_device, async_get_intf);
usb_autopm_get_interface(hso_dev->interface);
}
static void async_put_intf(struct work_struct *data)
{
struct hso_device *hso_dev =
container_of(data, struct hso_device, async_put_intf);
usb_autopm_put_interface(hso_dev->interface);
}
static int hso_get_activity(struct hso_device *hso_dev)
{
if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
if (!hso_dev->is_active) {
hso_dev->is_active = 1;
schedule_work(&hso_dev->async_get_intf);
}
}
if (hso_dev->usb->state != USB_STATE_CONFIGURED)
return -EAGAIN;
usb_mark_last_busy(hso_dev->usb);
return 0;
}
static int hso_put_activity(struct hso_device *hso_dev)
{
if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
if (hso_dev->is_active) {
hso_dev->is_active = 0;
schedule_work(&hso_dev->async_put_intf);
return -EAGAIN;
}
}
hso_dev->is_active = 0;
return 0;
}
/* called by kernel when we need to suspend device */
static int hso_suspend(struct usb_interface *iface, pm_message_t message)
{
int i, result;
/* Stop all serial ports */
for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
if (serial_table[i] && (serial_table[i]->interface == iface)) {
result = hso_stop_serial_device(serial_table[i]);
if (result)
goto out;
}
}
/* Stop all network ports */
for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
if (network_table[i] &&
(network_table[i]->interface == iface)) {
result = hso_stop_net_device(network_table[i]);
if (result)
goto out;
}
}
out:
return 0;
}
/* called by kernel when we need to resume device */
static int hso_resume(struct usb_interface *iface)
{
int i, result = 0;
struct hso_net *hso_net;
/* Start all serial ports */
for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
if (serial_table[i] && (serial_table[i]->interface == iface)) {
if (dev2ser(serial_table[i])->open_count) {
result =
hso_start_serial_device(serial_table[i], GFP_NOIO);
hso_kick_transmit(dev2ser(serial_table[i]));
if (result)
goto out;
}
}
}
/* Start all network ports */
for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
if (network_table[i] &&
(network_table[i]->interface == iface)) {
hso_net = dev2net(network_table[i]);
if (hso_net->flags & IFF_UP) {
/* First transmit any lingering data,
then restart the device. */
if (hso_net->skb_tx_buf) {
dev_dbg(&iface->dev,
"Transmitting"
" lingering data\n");
hso_net_start_xmit(hso_net->skb_tx_buf,
hso_net->net);
hso_net->skb_tx_buf = NULL;
}
result = hso_start_net_device(network_table[i]);
if (result)
goto out;
}
}
}
out:
return result;
}
static void hso_serial_ref_free(struct kref *ref)
{
struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
hso_free_serial_device(hso_dev);
}
static void hso_free_interface(struct usb_interface *interface)
{
struct hso_serial *hso_dev;
struct tty_struct *tty;
int i;
for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
if (serial_table[i]
&& (serial_table[i]->interface == interface)) {
hso_dev = dev2ser(serial_table[i]);
spin_lock_irq(&hso_dev->serial_lock);
tty = tty_kref_get(hso_dev->tty);
spin_unlock_irq(&hso_dev->serial_lock);
if (tty)
tty_hangup(tty);
mutex_lock(&hso_dev->parent->mutex);
tty_kref_put(tty);
hso_dev->parent->usb_gone = 1;
mutex_unlock(&hso_dev->parent->mutex);
kref_put(&serial_table[i]->ref, hso_serial_ref_free);
}
}
for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
if (network_table[i]
&& (network_table[i]->interface == interface)) {
struct rfkill *rfk = dev2net(network_table[i])->rfkill;
/* hso_stop_net_device doesn't stop the net queue since
* traffic needs to start it again when suspended */
netif_stop_queue(dev2net(network_table[i])->net);
hso_stop_net_device(network_table[i]);
cancel_work_sync(&network_table[i]->async_put_intf);
cancel_work_sync(&network_table[i]->async_get_intf);
if (rfk)
rfkill_unregister(rfk);
hso_free_net_device(network_table[i]);
}
}
}
/* Helper functions */
/* Get the endpoint ! */
static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
int type, int dir)
{
int i;
struct usb_host_interface *iface = intf->cur_altsetting;
struct usb_endpoint_descriptor *endp;
for (i = 0; i < iface->desc.bNumEndpoints; i++) {
endp = &iface->endpoint[i].desc;
if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
(usb_endpoint_type(endp) == type))
return endp;
}
return NULL;
}
/* Get the byte that describes which ports are enabled */
static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
{
int i;
struct usb_host_interface *iface = intf->cur_altsetting;
if (iface->extralen == 3) {
*ports = iface->extra[2];
return 0;
}
for (i = 0; i < iface->desc.bNumEndpoints; i++) {
if (iface->endpoint[i].extralen == 3) {
*ports = iface->endpoint[i].extra[2];
return 0;
}
}
return -1;
}
/* interrupt urb needs to be submitted, used for serial read of muxed port */
static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
struct usb_device *usb, gfp_t gfp)
{
int result;
usb_fill_int_urb(shared_int->shared_intr_urb, usb,
usb_rcvintpipe(usb,
shared_int->intr_endp->bEndpointAddress & 0x7F),
shared_int->shared_intr_buf,
shared_int->intr_endp->wMaxPacketSize,
intr_callback, shared_int,
shared_int->intr_endp->bInterval);
result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
if (result)
dev_warn(&usb->dev, "%s failed mux_intr_urb %d", __func__,
result);
return result;
}
/* operations setup of the serial interface */
static const struct tty_operations hso_serial_ops = {
.open = hso_serial_open,
.close = hso_serial_close,
.write = hso_serial_write,
.write_room = hso_serial_write_room,
.ioctl = hso_serial_ioctl,
.set_termios = hso_serial_set_termios,
.chars_in_buffer = hso_serial_chars_in_buffer,
.tiocmget = hso_serial_tiocmget,
.tiocmset = hso_serial_tiocmset,
.unthrottle = hso_unthrottle
};
static struct usb_driver hso_driver = {
.name = driver_name,
.probe = hso_probe,
.disconnect = hso_disconnect,
.id_table = hso_ids,
.suspend = hso_suspend,
.resume = hso_resume,
.reset_resume = hso_resume,
.supports_autosuspend = 1,
};
static int __init hso_init(void)
{
int i;
int result;
/* put it in the log */
printk(KERN_INFO "hso: %s\n", version);
/* Initialise the serial table semaphore and table */
spin_lock_init(&serial_table_lock);
for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
serial_table[i] = NULL;
/* allocate our driver using the proper amount of supported minors */
tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS);
if (!tty_drv)
return -ENOMEM;
/* fill in all needed values */
tty_drv->magic = TTY_DRIVER_MAGIC;
tty_drv->owner = THIS_MODULE;
tty_drv->driver_name = driver_name;
tty_drv->name = tty_filename;
/* if major number is provided as parameter, use that one */
if (tty_major)
tty_drv->major = tty_major;
tty_drv->minor_start = 0;
tty_drv->num = HSO_SERIAL_TTY_MINORS;
tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
tty_drv->subtype = SERIAL_TYPE_NORMAL;
tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
tty_drv->init_termios = tty_std_termios;
hso_init_termios(&tty_drv->init_termios);
tty_set_operations(tty_drv, &hso_serial_ops);
/* register the tty driver */
result = tty_register_driver(tty_drv);
if (result) {
printk(KERN_ERR "%s - tty_register_driver failed(%d)\n",
__func__, result);
return result;
}
/* register this module as an usb driver */
result = usb_register(&hso_driver);
if (result) {
printk(KERN_ERR "Could not register hso driver? error: %d\n",
result);
/* cleanup serial interface */
tty_unregister_driver(tty_drv);
return result;
}
/* done */
return 0;
}
static void __exit hso_exit(void)
{
printk(KERN_INFO "hso: unloaded\n");
tty_unregister_driver(tty_drv);
/* deregister the usb driver */
usb_deregister(&hso_driver);
}
/* Module definitions */
module_init(hso_init);
module_exit(hso_exit);
MODULE_AUTHOR(MOD_AUTHOR);
MODULE_DESCRIPTION(MOD_DESCRIPTION);
MODULE_LICENSE(MOD_LICENSE);
MODULE_INFO(Version, DRIVER_VERSION);
/* change the debug level (eg: insmod hso.ko debug=0x04) */
MODULE_PARM_DESC(debug, "Level of debug [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
module_param(debug, int, S_IRUGO | S_IWUSR);
/* set the major tty number (eg: insmod hso.ko tty_major=245) */
MODULE_PARM_DESC(tty_major, "Set the major tty number");
module_param(tty_major, int, S_IRUGO | S_IWUSR);
/* disable network interface (eg: insmod hso.ko disable_net=1) */
MODULE_PARM_DESC(disable_net, "Disable the network interface");
module_param(disable_net, int, S_IRUGO | S_IWUSR);
