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acrn-kernel/drivers/usb/serial/ipw.c

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/*
* IPWireless 3G UMTS TDD Modem driver (USB connected)
*
* Copyright (C) 2004 Roelf Diedericks <roelfd@inet.co.za>
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* All information about the device was acquired using SnoopyPro
* on MSFT's O/S, and examing the MSFT drivers' debug output
* (insanely left _on_ in the enduser version)
*
* It was written out of frustration with the IPWireless USB modem
* supplied by Axity3G/Sentech South Africa not supporting
* Linux whatsoever.
*
* Nobody provided any proprietary information that was not already
* available for this device.
*
* The modem adheres to the "3GPP TS 27.007 AT command set for 3G
* User Equipment (UE)" standard, available from
* http://www.3gpp.org/ftp/Specs/html-info/27007.htm
*
* The code was only tested the IPWireless handheld modem distributed
* in South Africa by Sentech.
*
* It may work for Woosh Inc in .nz too, as it appears they use the
* same kit.
*
* There is still some work to be done in terms of handling
* DCD, DTR, RTS, CTS which are currently faked.
* It's good enough for PPP at this point. It's based off all kinds of
* code found in usb/serial and usb/class
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <asm/uaccess.h>
#include "usb-serial.h"
/*
* Version Information
*/
#define DRIVER_VERSION "v0.3"
#define DRIVER_AUTHOR "Roelf Diedericks"
#define DRIVER_DESC "IPWireless tty driver"
#define IPW_TTY_MAJOR 240 /* real device node major id, experimental range */
#define IPW_TTY_MINORS 256 /* we support 256 devices, dunno why, it'd be insane :) */
#define USB_IPW_MAGIC 0x6d02 /* magic number for ipw struct */
/* Message sizes */
#define EVENT_BUFFER_SIZE 0xFF
#define CHAR2INT16(c1,c0) (((u32)((c1) & 0xff) << 8) + (u32)((c0) & 0xff))
#define NUM_BULK_URBS 24
#define NUM_CONTROL_URBS 16
/* vendor/product pairs that are known work with this driver*/
#define IPW_VID 0x0bc3
#define IPW_PID 0x0001
/* Vendor commands: */
/* baud rates */
enum {
ipw_sio_b256000 = 0x000e,
ipw_sio_b128000 = 0x001d,
ipw_sio_b115200 = 0x0020,
ipw_sio_b57600 = 0x0040,
ipw_sio_b56000 = 0x0042,
ipw_sio_b38400 = 0x0060,
ipw_sio_b19200 = 0x00c0,
ipw_sio_b14400 = 0x0100,
ipw_sio_b9600 = 0x0180,
ipw_sio_b4800 = 0x0300,
ipw_sio_b2400 = 0x0600,
ipw_sio_b1200 = 0x0c00,
ipw_sio_b600 = 0x1800
};
/* data bits */
#define ipw_dtb_7 0x700
#define ipw_dtb_8 0x810 // ok so the define is misleading, I know, but forces 8,n,1
// I mean, is there a point to any other setting these days? :)
/* usb control request types : */
#define IPW_SIO_RXCTL 0x00 // control bulk rx channel transmissions, value=1/0 (on/off)
#define IPW_SIO_SET_BAUD 0x01 // set baud, value=requested ipw_sio_bxxxx
#define IPW_SIO_SET_LINE 0x03 // set databits, parity. value=ipw_dtb_x
#define IPW_SIO_SET_PIN 0x03 // set/clear dtr/rts value=ipw_pin_xxx
#define IPW_SIO_POLL 0x08 // get serial port status byte, call with value=0
#define IPW_SIO_INIT 0x11 // initializes ? value=0 (appears as first thing todo on open)
#define IPW_SIO_PURGE 0x12 // purge all transmissions?, call with value=numchar_to_purge
#define IPW_SIO_HANDFLOW 0x13 // set xon/xoff limits value=0, and a buffer of 0x10 bytes
#define IPW_SIO_SETCHARS 0x13 // set the flowcontrol special chars, value=0, buf=6 bytes,
// last 2 bytes contain flowcontrol chars e.g. 00 00 00 00 11 13
/* values used for request IPW_SIO_SET_PIN */
#define IPW_PIN_SETDTR 0x101
#define IPW_PIN_SETRTS 0x202
#define IPW_PIN_CLRDTR 0x100
#define IPW_PIN_CLRRTS 0x200 // unconfirmed
/* values used for request IPW_SIO_RXCTL */
#define IPW_RXBULK_ON 1
#define IPW_RXBULK_OFF 0
/* various 16 byte hardcoded transferbuffers used by flow control */
#define IPW_BYTES_FLOWINIT { 0x01, 0, 0, 0, 0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
/* Interpretation of modem status lines */
/* These need sorting out by individually connecting pins and checking
* results. FIXME!
* When data is being sent we see 0x30 in the lower byte; this must
* contain DSR and CTS ...
*/
#define IPW_DSR ((1<<4) | (1<<5))
#define IPW_CTS ((1<<5) | (1<<4))
#define IPW_WANTS_TO_SEND 0x30
//#define IPW_DTR /* Data Terminal Ready */
//#define IPW_CTS /* Clear To Send */
//#define IPW_CD /* Carrier Detect */
//#define IPW_DSR /* Data Set Ready */
//#define IPW_RxD /* Receive pin */
//#define IPW_LE
//#define IPW_RTS
//#define IPW_ST
//#define IPW_SR
//#define IPW_RI /* Ring Indicator */
static struct usb_device_id usb_ipw_ids[] = {
{ USB_DEVICE(IPW_VID, IPW_PID) },
{ },
};
MODULE_DEVICE_TABLE(usb, usb_ipw_ids);
static struct usb_driver usb_ipw_driver = {
.name = "ipwtty",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = usb_ipw_ids,
.no_dynamic_id = 1,
};
static int debug;
static void ipw_read_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
struct usb_serial_port *port = urb->context;
unsigned char *data = urb->transfer_buffer;
struct tty_struct *tty;
int result;
dbg("%s - port %d", __FUNCTION__, port->number);
if (urb->status) {
dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
return;
}
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
tty = port->tty;
if (tty && urb->actual_length) {
tty_buffer_request_room(tty, urb->actual_length);
tty_insert_flip_string(tty, data, urb->actual_length);
tty_flip_buffer_push(tty);
}
/* Continue trying to always read */
usb_fill_bulk_urb (port->read_urb, port->serial->dev,
usb_rcvbulkpipe(port->serial->dev,
port->bulk_in_endpointAddress),
port->read_urb->transfer_buffer,
port->read_urb->transfer_buffer_length,
ipw_read_bulk_callback, port);
result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
if (result)
dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
return;
}
static int ipw_open(struct usb_serial_port *port, struct file *filp)
{
struct usb_device *dev = port->serial->dev;
u8 buf_flow_static[16] = IPW_BYTES_FLOWINIT;
u8 *buf_flow_init;
int result;
dbg("%s", __FUNCTION__);
buf_flow_init = kmalloc(16, GFP_KERNEL);
if (!buf_flow_init)
return -ENOMEM;
memcpy(buf_flow_init, buf_flow_static, 16);
if (port->tty)
port->tty->low_latency = 1;
/* --1: Tell the modem to initialize (we think) From sniffs this is always the
* first thing that gets sent to the modem during opening of the device */
dbg("%s: Sending SIO_INIT (we guess)",__FUNCTION__);
result = usb_control_msg(dev, usb_sndctrlpipe(dev,0),
IPW_SIO_INIT,
USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
0,
0, /* index */
NULL,
0,
100000);
if (result < 0)
dev_err(&port->dev, "Init of modem failed (error = %d)", result);
/* reset the bulk pipes */
usb_clear_halt(dev, usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress));
usb_clear_halt(dev, usb_sndbulkpipe(dev, port->bulk_out_endpointAddress));
/*--2: Start reading from the device */
dbg("%s: setting up bulk read callback",__FUNCTION__);
usb_fill_bulk_urb(port->read_urb, dev,
usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
port->bulk_in_buffer,
port->bulk_in_size,
ipw_read_bulk_callback, port);
result = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (result < 0)
dbg("%s - usb_submit_urb(read bulk) failed with status %d", __FUNCTION__, result);
/*--3: Tell the modem to open the floodgates on the rx bulk channel */
dbg("%s:asking modem for RxRead (RXBULK_ON)",__FUNCTION__);
result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
IPW_SIO_RXCTL,
USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
IPW_RXBULK_ON,
0, /* index */
NULL,
0,
100000);
if (result < 0)
dev_err(&port->dev, "Enabling bulk RxRead failed (error = %d)", result);
/*--4: setup the initial flowcontrol */
dbg("%s:setting init flowcontrol (%s)",__FUNCTION__,buf_flow_init);
result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
IPW_SIO_HANDFLOW,
USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
0,
0,
buf_flow_init,
0x10,
200000);
if (result < 0)
dev_err(&port->dev, "initial flowcontrol failed (error = %d)", result);
/*--5: raise the dtr */
dbg("%s:raising dtr",__FUNCTION__);
result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
IPW_SIO_SET_PIN,
USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
IPW_PIN_SETDTR,
0,
NULL,
0,
200000);
if (result < 0)
dev_err(&port->dev, "setting dtr failed (error = %d)", result);
/*--6: raise the rts */
dbg("%s:raising rts",__FUNCTION__);
result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
IPW_SIO_SET_PIN,
USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
IPW_PIN_SETRTS,
0,
NULL,
0,
200000);
if (result < 0)
dev_err(&port->dev, "setting dtr failed (error = %d)", result);
kfree(buf_flow_init);
return 0;
}
static void ipw_close(struct usb_serial_port *port, struct file * filp)
{
struct usb_device *dev = port->serial->dev;
int result;
if (tty_hung_up_p(filp)) {
dbg("%s: tty_hung_up_p ...", __FUNCTION__);
return;
}
/*--1: drop the dtr */
dbg("%s:dropping dtr",__FUNCTION__);
result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
IPW_SIO_SET_PIN,
USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
IPW_PIN_CLRDTR,
0,
NULL,
0,
200000);
if (result < 0)
dev_err(&port->dev, "dropping dtr failed (error = %d)", result);
/*--2: drop the rts */
dbg("%s:dropping rts",__FUNCTION__);
result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
IPW_SIO_SET_PIN, USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
IPW_PIN_CLRRTS,
0,
NULL,
0,
200000);
if (result < 0)
dev_err(&port->dev, "dropping rts failed (error = %d)", result);
/*--3: purge */
dbg("%s:sending purge",__FUNCTION__);
result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
IPW_SIO_PURGE, USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
0x03,
0,
NULL,
0,
200000);
if (result < 0)
dev_err(&port->dev, "purge failed (error = %d)", result);
/* send RXBULK_off (tell modem to stop transmitting bulk data on rx chan) */
result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
IPW_SIO_RXCTL,
USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
IPW_RXBULK_OFF,
0, /* index */
NULL,
0,
100000);
if (result < 0)
dev_err(&port->dev, "Disabling bulk RxRead failed (error = %d)", result);
/* shutdown any in-flight urbs that we know about */
usb_kill_urb(port->read_urb);
usb_kill_urb(port->write_urb);
}
static void ipw_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
struct usb_serial_port *port = urb->context;
dbg("%s", __FUNCTION__);
if (urb->status)
dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
usb_serial_port_softint(port);
}
static int ipw_write(struct usb_serial_port *port, const unsigned char *buf, int count)
{
struct usb_device *dev = port->serial->dev;
int ret;
dbg("%s: TOP: count=%d, in_interrupt=%ld", __FUNCTION__,
count, in_interrupt() );
if (count == 0) {
dbg("%s - write request of 0 bytes", __FUNCTION__);
return 0;
}
spin_lock(&port->lock);
if (port->write_urb_busy) {
spin_unlock(&port->lock);
dbg("%s - already writing", __FUNCTION__);
return 0;
}
port->write_urb_busy = 1;
spin_unlock(&port->lock);
count = min(count, port->bulk_out_size);
memcpy(port->bulk_out_buffer, buf, count);
dbg("%s count now:%d", __FUNCTION__, count);
usb_fill_bulk_urb(port->write_urb, dev,
usb_sndbulkpipe(dev, port->bulk_out_endpointAddress),
port->write_urb->transfer_buffer,
count,
ipw_write_bulk_callback,
port);
ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (ret != 0) {
port->write_urb_busy = 0;
dbg("%s - usb_submit_urb(write bulk) failed with error = %d", __FUNCTION__, ret);
return ret;
}
dbg("%s returning %d", __FUNCTION__, count);
return count;
}
static int ipw_probe(struct usb_serial_port *port)
{
return 0;
}
static int ipw_disconnect(struct usb_serial_port *port)
{
usb_set_serial_port_data(port, NULL);
return 0;
}
static struct usb_serial_driver ipw_device = {
.driver = {
.owner = THIS_MODULE,
.name = "ipw",
},
.description = "IPWireless converter",
.id_table = usb_ipw_ids,
.num_interrupt_in = NUM_DONT_CARE,
.num_bulk_in = 1,
.num_bulk_out = 1,
.num_ports = 1,
.open = ipw_open,
.close = ipw_close,
.port_probe = ipw_probe,
.port_remove = ipw_disconnect,
.write = ipw_write,
.write_bulk_callback = ipw_write_bulk_callback,
.read_bulk_callback = ipw_read_bulk_callback,
};
static int usb_ipw_init(void)
{
int retval;
retval = usb_serial_register(&ipw_device);
if (retval)
return retval;
retval = usb_register(&usb_ipw_driver);
if (retval) {
usb_serial_deregister(&ipw_device);
return retval;
}
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;
}
static void usb_ipw_exit(void)
{
usb_deregister(&usb_ipw_driver);
usb_serial_deregister(&ipw_device);
}
module_init(usb_ipw_init);
module_exit(usb_ipw_exit);
/* Module information */
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
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