/*
* USB driver for Gigaset 307x base via direct USB connection.
*
* Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
* Tilman Schmidt <tilman@imap.cc>,
* Stefan Eilers <Eilers.Stefan@epost.de>.
*
* Based on usb-gigaset.c.
*
* =====================================================================
* 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.
* =====================================================================
* ToDo: ...
* =====================================================================
* Version: $Id: bas-gigaset.c,v 1.52.4.19 2006/02/04 18:28:16 hjlipp Exp $
* =====================================================================
*/
#include "gigaset.h"
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/usb.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
/* Version Information */
#define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers <Eilers.Stefan@epost.de>"
#define DRIVER_DESC "USB Driver for Gigaset 307x"
/* Module parameters */
static int startmode = SM_ISDN;
static int cidmode = 1;
module_param(startmode, int, S_IRUGO);
module_param(cidmode, int, S_IRUGO);
MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
MODULE_PARM_DESC(cidmode, "Call-ID mode");
#define GIGASET_MINORS 1
#define GIGASET_MINOR 16
#define GIGASET_MODULENAME "bas_gigaset"
#define GIGASET_DEVFSNAME "gig/bas/"
#define GIGASET_DEVNAME "ttyGB"
#define IF_WRITEBUF 256 //FIXME
/* Values for the Gigaset 307x */
#define USB_GIGA_VENDOR_ID 0x0681
#define USB_GIGA_PRODUCT_ID 0x0001
#define USB_4175_PRODUCT_ID 0x0002
#define USB_SX303_PRODUCT_ID 0x0021
#define USB_SX353_PRODUCT_ID 0x0022
/* table of devices that work with this driver */
static struct usb_device_id gigaset_table [] = {
{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_GIGA_PRODUCT_ID) },
{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_4175_PRODUCT_ID) },
{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, gigaset_table);
/* Get a minor range for your devices from the usb maintainer */
#define USB_SKEL_MINOR_BASE 200
/*======================= local function prototypes =============================*/
/* This function is called if a new device is connected to the USB port. It
* checks whether this new device belongs to this driver.
*/
static int gigaset_probe(struct usb_interface *interface,
const struct usb_device_id *id);
/* Function will be called if the device is unplugged */
static void gigaset_disconnect(struct usb_interface *interface);
/*==============================================================================*/
struct bas_cardstate {
struct usb_device *udev; /* USB device pointer */
struct usb_interface *interface; /* interface for this device */
unsigned char minor; /* starting minor number */
struct urb *urb_ctrl; /* control pipe default URB */
struct usb_ctrlrequest dr_ctrl;
struct timer_list timer_ctrl; /* control request timeout */
struct timer_list timer_atrdy; /* AT command ready timeout */
struct urb *urb_cmd_out; /* for sending AT commands */
struct usb_ctrlrequest dr_cmd_out;
int retry_cmd_out;
struct urb *urb_cmd_in; /* for receiving AT replies */
struct usb_ctrlrequest dr_cmd_in;
struct timer_list timer_cmd_in; /* receive request timeout */
unsigned char *rcvbuf; /* AT reply receive buffer */
struct urb *urb_int_in; /* URB for interrupt pipe */
unsigned char int_in_buf[3];
spinlock_t lock; /* locks all following */
atomic_t basstate; /* bitmap (BS_*) */
int pending; /* uncompleted base request */
int rcvbuf_size; /* size of AT receive buffer */
/* 0: no receive in progress */
int retry_cmd_in; /* receive req retry count */
};
/* status of direct USB connection to 307x base (bits in basstate) */
#define BS_ATOPEN 0x001
#define BS_B1OPEN 0x002
#define BS_B2OPEN 0x004
#define BS_ATREADY 0x008
#define BS_INIT 0x010
#define BS_ATTIMER 0x020
static struct gigaset_driver *driver = NULL;
static struct cardstate *cardstate = NULL;
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver gigaset_usb_driver = {
.name = GIGASET_MODULENAME,
.probe = gigaset_probe,
.disconnect = gigaset_disconnect,
.id_table = gigaset_table,
};
/* get message text for USB status code
*/
static char *get_usb_statmsg(int status)
{
static char unkmsg[28];
switch (status) {
case 0:
return "success";
case -ENOENT:
return "canceled";
case -ECONNRESET:
return "canceled (async)";
case -EINPROGRESS:
return "pending";
case -EPROTO:
return "bit stuffing or unknown USB error";
case -EILSEQ:
return "Illegal byte sequence (CRC mismatch)";
case -EPIPE:
return "babble detect or endpoint stalled";
case -ENOSR:
return "buffer error";
case -ETIMEDOUT:
return "timed out";
case -ENODEV:
return "device not present";
case -EREMOTEIO:
return "short packet detected";
case -EXDEV:
return "partial isochronous transfer";
case -EINVAL:
return "invalid argument";
case -ENXIO:
return "URB already queued";
case -EAGAIN:
return "isochronous start frame too early or too much scheduled";
case -EFBIG:
return "too many isochronous frames requested";
case -EMSGSIZE:
return "endpoint message size zero";
case -ESHUTDOWN:
return "endpoint shutdown";
case -EBUSY:
return "another request pending";
default:
snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", status);
return unkmsg;
}
}
/* usb_pipetype_str
* retrieve string representation of USB pipe type
*/
static inline char *usb_pipetype_str(int pipe)
{
if (usb_pipeisoc(pipe))
return "Isoc";
if (usb_pipeint(pipe))
return "Int";
if (usb_pipecontrol(pipe))
return "Ctrl";
if (usb_pipebulk(pipe))
return "Bulk";
return "?";
}
/* dump_urb
* write content of URB to syslog for debugging
*/
static inline void dump_urb(enum debuglevel level, const char *tag,
struct urb *urb)
{
#ifdef CONFIG_GIGASET_DEBUG
int i;
IFNULLRET(tag);
dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
if (urb) {
dbg(level,
" dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
"status=%d, hcpriv=0x%08lx, transfer_flags=0x%x,",
(unsigned long) urb->dev,
usb_pipetype_str(urb->pipe),
usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
usb_pipein(urb->pipe) ? "in" : "out",
urb->status, (unsigned long) urb->hcpriv,
urb->transfer_flags);
dbg(level,
" transfer_buffer=0x%08lx[%d], actual_length=%d, "
"bandwidth=%d, setup_packet=0x%08lx,",
(unsigned long) urb->transfer_buffer,
urb->transfer_buffer_length, urb->actual_length,
urb->bandwidth, (unsigned long) urb->setup_packet);
dbg(level,
" start_frame=%d, number_of_packets=%d, interval=%d, "
"error_count=%d,",
urb->start_frame, urb->number_of_packets, urb->interval,
urb->error_count);
dbg(level,
" context=0x%08lx, complete=0x%08lx, iso_frame_desc[]={",
(unsigned long) urb->context,
(unsigned long) urb->complete);
for (i = 0; i < urb->number_of_packets; i++) {
struct usb_iso_packet_descriptor *pifd = &urb->iso_frame_desc[i];
dbg(level,
" {offset=%u, length=%u, actual_length=%u, "
"status=%u}",
pifd->offset, pifd->length, pifd->actual_length,
pifd->status);
}
}
dbg(level, "}}");
#endif
}
/* read/set modem control bits etc. (m10x only) */
static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
unsigned new_state)
{
return -EINVAL;
}
static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
{
return -EINVAL;
}
static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
{
return -EINVAL;
}
/* error_hangup
* hang up any existing connection because of an unrecoverable error
* This function may be called from any context and takes care of scheduling
* the necessary actions for execution outside of interrupt context.
* argument:
* B channel control structure
*/
static inline void error_hangup(struct bc_state *bcs)
{
struct cardstate *cs = bcs->cs;
dbg(DEBUG_ANY,
"%s: scheduling HUP for channel %d", __func__, bcs->channel);
if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL)) {
//FIXME what should we do?
return;
}
gigaset_schedule_event(cs);
}
/* error_reset
* reset Gigaset device because of an unrecoverable error
* This function may be called from any context and takes care of scheduling
* the necessary actions for execution outside of interrupt context.
* argument:
* controller state structure
*/
static inline void error_reset(struct cardstate *cs)
{
//FIXME try to recover without bothering the user
err("unrecoverable error - please disconnect the Gigaset base to reset");
}
/* check_pending
* check for completion of pending control request
* parameter:
* urb USB request block of completed request
* urb->context = hardware specific controller state structure
*/
static void check_pending(struct bas_cardstate *ucs)
{
unsigned long flags;
IFNULLRET(ucs);
IFNULLRET(cardstate);
spin_lock_irqsave(&ucs->lock, flags);
switch (ucs->pending) {
case 0:
break;
case HD_OPEN_ATCHANNEL:
if (atomic_read(&ucs->basstate) & BS_ATOPEN)
ucs->pending = 0;
break;
case HD_OPEN_B1CHANNEL:
if (atomic_read(&ucs->basstate) & BS_B1OPEN)
ucs->pending = 0;
break;
case HD_OPEN_B2CHANNEL:
if (atomic_read(&ucs->basstate) & BS_B2OPEN)
ucs->pending = 0;
break;
case HD_CLOSE_ATCHANNEL:
if (!(atomic_read(&ucs->basstate) & BS_ATOPEN))
ucs->pending = 0;
//wake_up_interruptible(cs->initwait);
//FIXME need own wait queue?
break;
case HD_CLOSE_B1CHANNEL:
if (!(atomic_read(&ucs->basstate) & BS_B1OPEN))
ucs->pending = 0;
break;
case HD_CLOSE_B2CHANNEL:
if (!(atomic_read(&ucs->basstate) & BS_B2OPEN))
ucs->pending = 0;
break;
case HD_DEVICE_INIT_ACK: /* no reply expected */
ucs->pending = 0;
break;
/* HD_READ_ATMESSAGE, HD_WRITE_ATMESSAGE, HD_RESET_INTERRUPTPIPE
* are handled separately and should never end up here
*/
default:
warn("unknown pending request 0x%02x cleared", ucs->pending);
ucs->pending = 0;
}
if (!ucs->pending)
del_timer(&ucs->timer_ctrl);
spin_unlock_irqrestore(&ucs->lock, flags);
}
/* cmd_in_timeout
* timeout routine for command input request
* argument:
* controller state structure
*/
static void cmd_in_timeout(unsigned long data)
{
struct cardstate *cs = (struct cardstate *) data;
struct bas_cardstate *ucs;
unsigned long flags;
IFNULLRET(cs);
ucs = cs->hw.bas;
IFNULLRET(ucs);
spin_lock_irqsave(&cs->lock, flags);
if (!atomic_read(&cs->connected)) {
dbg(DEBUG_USBREQ, "%s: disconnected", __func__);
spin_unlock_irqrestore(&cs->lock, flags);
return;
}
if (!ucs->rcvbuf_size) {
dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
spin_unlock_irqrestore(&cs->lock, flags);
return;
}
spin_unlock_irqrestore(&cs->lock, flags);
err("timeout reading AT response");
error_reset(cs); //FIXME retry?
}
static void read_ctrl_callback(struct urb *urb, struct pt_regs *regs);
/* atread_submit
* submit an HD_READ_ATMESSAGE command URB
* parameters:
* cs controller state structure
* timeout timeout in 1/10 sec., 0: none
* return value:
* 0 on success
* -EINVAL if a NULL pointer is encountered somewhere
* -EBUSY if another request is pending
* any URB submission error code
*/
static int atread_submit(struct cardstate *cs, int timeout)
{
struct bas_cardstate *ucs;
int ret;
IFNULLRETVAL(cs, -EINVAL);
ucs = cs->hw.bas;
IFNULLRETVAL(ucs, -EINVAL);
IFNULLRETVAL(ucs->urb_cmd_in, -EINVAL);
dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)", ucs->rcvbuf_size);
if (ucs->urb_cmd_in->status == -EINPROGRESS) {
err("could not submit HD_READ_ATMESSAGE: URB busy");
return -EBUSY;
}
ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
ucs->dr_cmd_in.wValue = 0;
ucs->dr_cmd_in.wIndex = 0;
ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
usb_rcvctrlpipe(ucs->udev, 0),
(unsigned char*) & ucs->dr_cmd_in,
ucs->rcvbuf, ucs->rcvbuf_size,
read_ctrl_callback, cs->inbuf);
if ((ret = usb_submit_urb(ucs->urb_cmd_in, SLAB_ATOMIC)) != 0) {
err("could not submit HD_READ_ATMESSAGE: %s",
get_usb_statmsg(ret));
return ret;
}
if (timeout > 0) {
dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
ucs->timer_cmd_in.data = (unsigned long) cs;
ucs->timer_cmd_in.function = cmd_in_timeout;
add_timer(&ucs->timer_cmd_in);
}
return 0;
}
static void stopurbs(struct bas_bc_state *);
static int start_cbsend(struct cardstate *);
/* set/clear bits in base connection state
*/
inline static void update_basstate(struct bas_cardstate *ucs,
int set, int clear)
{
unsigned long flags;
int state;
spin_lock_irqsave(&ucs->lock, flags);
state = atomic_read(&ucs->basstate);
state &= ~clear;
state |= set;
atomic_set(&ucs->basstate, state);
spin_unlock_irqrestore(&ucs->lock, flags);
}
/* read_int_callback
* USB completion handler for interrupt pipe input
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block
* urb->context = controller state structure
*/
static void read_int_callback(struct urb *urb, struct pt_regs *regs)
{
struct cardstate *cs;
struct bas_cardstate *ucs;
struct bc_state *bcs;
unsigned long flags;
int status;
unsigned l;
int channel;
IFNULLRET(urb);
cs = (struct cardstate *) urb->context;
IFNULLRET(cs);
ucs = cs->hw.bas;
IFNULLRET(ucs);
if (unlikely(!atomic_read(&cs->connected))) {
warn("%s: disconnected", __func__);
return;
}
switch (urb->status) {
case 0: /* success */
break;
case -ENOENT: /* canceled */
case -ECONNRESET: /* canceled (async) */
case -EINPROGRESS: /* pending */
/* ignore silently */
dbg(DEBUG_USBREQ,
"%s: %s", __func__, get_usb_statmsg(urb->status));
return;
default: /* severe trouble */
warn("interrupt read: %s", get_usb_statmsg(urb->status));
//FIXME corrective action? resubmission always ok?
goto resubmit;
}
l = (unsigned) ucs->int_in_buf[1] +
(((unsigned) ucs->int_in_buf[2]) << 8);
dbg(DEBUG_USBREQ,
"<-------%d: 0x%02x (%u [0x%02x 0x%02x])", urb->actual_length,
(int)ucs->int_in_buf[0], l,
(int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
channel = 0;
switch (ucs->int_in_buf[0]) {
case HD_DEVICE_INIT_OK:
update_basstate(ucs, BS_INIT, 0);
break;
case HD_READY_SEND_ATDATA:
del_timer(&ucs->timer_atrdy);
update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
start_cbsend(cs);
break;
case HD_OPEN_B2CHANNEL_ACK:
++channel;
case HD_OPEN_B1CHANNEL_ACK:
bcs = cs->bcs + channel;
update_basstate(ucs, BS_B1OPEN << channel, 0);
gigaset_bchannel_up(bcs);
break;
case HD_OPEN_ATCHANNEL_ACK:
update_basstate(ucs, BS_ATOPEN, 0);
start_cbsend(cs);
break;
case HD_CLOSE_B2CHANNEL_ACK:
++channel;
case HD_CLOSE_B1CHANNEL_ACK:
bcs = cs->bcs + channel;
update_basstate(ucs, 0, BS_B1OPEN << channel);
stopurbs(bcs->hw.bas);
gigaset_bchannel_down(bcs);
break;
case HD_CLOSE_ATCHANNEL_ACK:
update_basstate(ucs, 0, BS_ATOPEN);
break;
case HD_B2_FLOW_CONTROL:
++channel;
case HD_B1_FLOW_CONTROL:
bcs = cs->bcs + channel;
atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
&bcs->hw.bas->corrbytes);
dbg(DEBUG_ISO,
"Flow control (channel %d, sub %d): 0x%02x => %d",
channel, bcs->hw.bas->numsub, l,
atomic_read(&bcs->hw.bas->corrbytes));
break;
case HD_RECEIVEATDATA_ACK: /* AT response ready to be received */
if (!l) {
warn("HD_RECEIVEATDATA_ACK with length 0 ignored");
break;
}
spin_lock_irqsave(&cs->lock, flags);
if (ucs->rcvbuf_size) {
spin_unlock_irqrestore(&cs->lock, flags);
err("receive AT data overrun, %d bytes lost", l);
error_reset(cs); //FIXME reschedule
break;
}
if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
spin_unlock_irqrestore(&cs->lock, flags);
err("%s: out of memory, %d bytes lost", __func__, l);
error_reset(cs); //FIXME reschedule
break;
}
ucs->rcvbuf_size = l;
ucs->retry_cmd_in = 0;
if ((status = atread_submit(cs, BAS_TIMEOUT)) < 0) {
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
error_reset(cs); //FIXME reschedule
}
spin_unlock_irqrestore(&cs->lock, flags);
break;
case HD_RESET_INTERRUPT_PIPE_ACK:
dbg(DEBUG_USBREQ, "HD_RESET_INTERRUPT_PIPE_ACK");
break;
case HD_SUSPEND_END:
dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
break;
default:
warn("unknown Gigaset signal 0x%02x (%u) ignored",
(int) ucs->int_in_buf[0], l);
}
check_pending(ucs);
resubmit:
status = usb_submit_urb(urb, SLAB_ATOMIC);
if (unlikely(status)) {
err("could not resubmit interrupt URB: %s",
get_usb_statmsg(status));
error_reset(cs);
}
}
/* read_ctrl_callback
* USB completion handler for control pipe input
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block
* urb->context = inbuf structure for controller state
*/
static void read_ctrl_callback(struct urb *urb, struct pt_regs *regs)
{
struct cardstate *cs;
struct bas_cardstate *ucs;
unsigned numbytes;
unsigned long flags;
struct inbuf_t *inbuf;
int have_data = 0;
IFNULLRET(urb);
inbuf = (struct inbuf_t *) urb->context;
IFNULLRET(inbuf);
cs = inbuf->cs;
IFNULLRET(cs);
ucs = cs->hw.bas;
IFNULLRET(ucs);
spin_lock_irqsave(&cs->lock, flags);
if (!atomic_read(&cs->connected)) {
warn("%s: disconnected", __func__);
spin_unlock_irqrestore(&cs->lock, flags);
return;
}
if (!ucs->rcvbuf_size) {
warn("%s: no receive in progress", __func__);
spin_unlock_irqrestore(&cs->lock, flags);
return;
}
del_timer(&ucs->timer_cmd_in);
switch (urb->status) {
case 0: /* normal completion */
numbytes = urb->actual_length;
if (unlikely(numbytes == 0)) {
warn("control read: empty block received");
goto retry;
}
if (unlikely(numbytes != ucs->rcvbuf_size)) {
warn("control read: received %d chars, expected %d",
numbytes, ucs->rcvbuf_size);
if (numbytes > ucs->rcvbuf_size)
numbytes = ucs->rcvbuf_size;
}
/* copy received bytes to inbuf */
have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
if (unlikely(numbytes < ucs->rcvbuf_size)) {
/* incomplete - resubmit for remaining bytes */
ucs->rcvbuf_size -= numbytes;
ucs->retry_cmd_in = 0;
goto retry;
}
break;
case -ENOENT: /* canceled */
case -ECONNRESET: /* canceled (async) */
case -EINPROGRESS: /* pending */
/* no action necessary */
dbg(DEBUG_USBREQ,
"%s: %s", __func__, get_usb_statmsg(urb->status));
break;
default: /* severe trouble */
warn("control read: %s", get_usb_statmsg(urb->status));
retry:
if (ucs->retry_cmd_in++ < BAS_RETRY) {
notice("control read: retry %d", ucs->retry_cmd_in);
if (atread_submit(cs, BAS_TIMEOUT) >= 0) {
/* resubmitted - bypass regular exit block */
spin_unlock_irqrestore(&cs->lock, flags);
return;
}
} else {
err("control read: giving up after %d tries",
ucs->retry_cmd_in);
}
error_reset(cs);
}
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
spin_unlock_irqrestore(&cs->lock, flags);
if (have_data) {
dbg(DEBUG_INTR, "%s-->BH", __func__);
gigaset_schedule_event(cs);
}
}
/* read_iso_callback
* USB completion handler for B channel isochronous input
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block of completed request
* urb->context = bc_state structure
*/
static void read_iso_callback(struct urb *urb, struct pt_regs *regs)
{
struct bc_state *bcs;
struct bas_bc_state *ubc;
unsigned long flags;
int i, rc;
IFNULLRET(urb);
IFNULLRET(urb->context);
IFNULLRET(cardstate);
/* status codes not worth bothering the tasklet with */
if (unlikely(urb->status == -ENOENT || urb->status == -ECONNRESET ||
urb->status == -EINPROGRESS)) {
dbg(DEBUG_ISO,
"%s: %s", __func__, get_usb_statmsg(urb->status));
return;
}
bcs = (struct bc_state *) urb->context;
ubc = bcs->hw.bas;
IFNULLRET(ubc);
spin_lock_irqsave(&ubc->isoinlock, flags);
if (likely(ubc->isoindone == NULL)) {
/* pass URB to tasklet */
ubc->isoindone = urb;
tasklet_schedule(&ubc->rcvd_tasklet);
} else {
/* tasklet still busy, drop data and resubmit URB */
ubc->loststatus = urb->status;
for (i = 0; i < BAS_NUMFRAMES; i++) {
ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
if (unlikely(urb->iso_frame_desc[i].status != 0 &&
urb->iso_frame_desc[i].status != -EINPROGRESS)) {
ubc->loststatus = urb->iso_frame_desc[i].status;
}
urb->iso_frame_desc[i].status = 0;
urb->iso_frame_desc[i].actual_length = 0;
}
if (likely(atomic_read(&ubc->running))) {
urb->dev = bcs->cs->hw.bas->udev; /* clobbered by USB subsystem */
urb->transfer_flags = URB_ISO_ASAP;
urb->number_of_packets = BAS_NUMFRAMES;
dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit", __func__);
rc = usb_submit_urb(urb, SLAB_ATOMIC);
if (unlikely(rc != 0)) {
err("could not resubmit isochronous read URB: %s",
get_usb_statmsg(rc));
dump_urb(DEBUG_ISO, "isoc read", urb);
error_hangup(bcs);
}
}
}
spin_unlock_irqrestore(&ubc->isoinlock, flags);
}
/* write_iso_callback
* USB completion handler for B channel isochronous output
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block of completed request
* urb->context = isow_urbctx_t structure
*/
static void write_iso_callback(struct urb *urb, struct pt_regs *regs)
{
struct isow_urbctx_t *ucx;
struct bas_bc_state *ubc;
unsigned long flags;
IFNULLRET(urb);
IFNULLRET(urb->context);
IFNULLRET(cardstate);
/* status codes not worth bothering the tasklet with */
if (unlikely(urb->status == -ENOENT || urb->status == -ECONNRESET ||
urb->status == -EINPROGRESS)) {
dbg(DEBUG_ISO,
"%s: %s", __func__, get_usb_statmsg(urb->status));
return;
}
/* pass URB context to tasklet */
ucx = (struct isow_urbctx_t *) urb->context;
IFNULLRET(ucx->bcs);
ubc = ucx->bcs->hw.bas;
IFNULLRET(ubc);
spin_lock_irqsave(&ubc->isooutlock, flags);
ubc->isooutovfl = ubc->isooutdone;
ubc->isooutdone = ucx;
spin_unlock_irqrestore(&ubc->isooutlock, flags);
tasklet_schedule(&ubc->sent_tasklet);
}
/* starturbs
* prepare and submit USB request blocks for isochronous input and output
* argument:
* B channel control structure
* return value:
* 0 on success
* < 0 on error (no URBs submitted)
*/
static int starturbs(struct bc_state *bcs)
{
struct urb *urb;
struct bas_bc_state *ubc;
int j, k;
int rc;
IFNULLRETVAL(bcs, -EFAULT);
ubc = bcs->hw.bas;
IFNULLRETVAL(ubc, -EFAULT);
/* initialize L2 reception */
if (bcs->proto2 == ISDN_PROTO_L2_HDLC)
bcs->inputstate |= INS_flag_hunt;
/* submit all isochronous input URBs */
atomic_set(&ubc->running, 1);
for (k = 0; k < BAS_INURBS; k++) {
urb = ubc->isoinurbs[k];
if (!urb) {
err("isoinurbs[%d]==NULL", k);
rc = -EFAULT;
goto error;
}
urb->dev = bcs->cs->hw.bas->udev;
urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
urb->transfer_flags = URB_ISO_ASAP;
urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
urb->transfer_buffer_length = BAS_INBUFSIZE;
urb->number_of_packets = BAS_NUMFRAMES;
urb->interval = BAS_FRAMETIME;
urb->complete = read_iso_callback;
urb->context = bcs;
for (j = 0; j < BAS_NUMFRAMES; j++) {
urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
urb->iso_frame_desc[j].length = BAS_MAXFRAME;
urb->iso_frame_desc[j].status = 0;
urb->iso_frame_desc[j].actual_length = 0;
}
dump_urb(DEBUG_ISO, "Initial isoc read", urb);
if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) {
err("could not submit isochronous read URB %d: %s",
k, get_usb_statmsg(rc));
goto error;
}
}
/* initialize L2 transmission */
gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
/* set up isochronous output URBs for flag idling */
for (k = 0; k < BAS_OUTURBS; ++k) {
urb = ubc->isoouturbs[k].urb;
if (!urb) {
err("isoouturbs[%d].urb==NULL", k);
rc = -EFAULT;
goto error;
}
urb->dev = bcs->cs->hw.bas->udev;
urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
urb->transfer_flags = URB_ISO_ASAP;
urb->transfer_buffer = ubc->isooutbuf->data;
urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
urb->number_of_packets = BAS_NUMFRAMES;
urb->interval = BAS_FRAMETIME;
urb->complete = write_iso_callback;
urb->context = &ubc->isoouturbs[k];
for (j = 0; j < BAS_NUMFRAMES; ++j) {
urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
urb->iso_frame_desc[j].length = BAS_NORMFRAME;
urb->iso_frame_desc[j].status = 0;
urb->iso_frame_desc[j].actual_length = 0;
}
ubc->isoouturbs[k].limit = -1;
}
/* submit two URBs, keep third one */
for (k = 0; k < 2; ++k) {
dump_urb(DEBUG_ISO, "Initial isoc write", urb);
rc = usb_submit_urb(ubc->isoouturbs[k].urb, SLAB_ATOMIC);
if (rc != 0) {
err("could not submit isochronous write URB %d: %s",
k, get_usb_statmsg(rc));
goto error;
}
}
dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
ubc->isooutfree = &ubc->isoouturbs[2];
ubc->isooutdone = ubc->isooutovfl = NULL;
return 0;
error:
stopurbs(ubc);
return rc;
}
/* stopurbs
* cancel the USB request blocks for isochronous input and output
* errors are silently ignored
* argument:
* B channel control structure
*/
static void stopurbs(struct bas_bc_state *ubc)
{
int k, rc;
IFNULLRET(ubc);
atomic_set(&ubc->running, 0);
for (k = 0; k < BAS_INURBS; ++k) {
rc = usb_unlink_urb(ubc->isoinurbs[k]);
dbg(DEBUG_ISO, "%s: isoc input URB %d unlinked, result = %d",
__func__, k, rc);
}
for (k = 0; k < BAS_OUTURBS; ++k) {
rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
dbg(DEBUG_ISO, "%s: isoc output URB %d unlinked, result = %d",
__func__, k, rc);
}
}
/* Isochronous Write - Bottom Half */
/* =============================== */
/* submit_iso_write_urb
* fill and submit the next isochronous write URB
* parameters:
* bcs B channel state structure
* return value:
* number of frames submitted in URB
* 0 if URB not submitted because no data available (isooutbuf busy)
* error code < 0 on error
*/
static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
{
struct urb *urb;
struct bas_bc_state *ubc;
struct usb_iso_packet_descriptor *ifd;
int corrbytes, nframe, rc;
IFNULLRETVAL(ucx, -EFAULT);
urb = ucx->urb;
IFNULLRETVAL(urb, -EFAULT);
IFNULLRETVAL(ucx->bcs, -EFAULT);
ubc = ucx->bcs->hw.bas;
IFNULLRETVAL(ubc, -EFAULT);
urb->dev = ucx->bcs->cs->hw.bas->udev; /* clobbered by USB subsystem */
urb->transfer_flags = URB_ISO_ASAP;
urb->transfer_buffer = ubc->isooutbuf->data;
urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
ifd = &urb->iso_frame_desc[nframe];
/* compute frame length according to flow control */
ifd->length = BAS_NORMFRAME;
if ((corrbytes = atomic_read(&ubc->corrbytes)) != 0) {
dbg(DEBUG_ISO, "%s: corrbytes=%d", __func__, corrbytes);
if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
ifd->length += corrbytes;
atomic_add(-corrbytes, &ubc->corrbytes);
}
//dbg(DEBUG_ISO, "%s: frame %d length=%d", __func__, nframe, ifd->length);
/* retrieve block of data to send */
ifd->offset = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
if (ifd->offset < 0) {
if (ifd->offset == -EBUSY) {
dbg(DEBUG_ISO, "%s: buffer busy at frame %d",
__func__, nframe);
/* tasklet will be restarted from gigaset_send_skb() */
} else {
err("%s: buffer error %d at frame %d",
__func__, ifd->offset, nframe);
return ifd->offset;
}
break;
}
ucx->limit = atomic_read(&ubc->isooutbuf->nextread);
ifd->status = 0;
ifd->actual_length = 0;
}
if ((urb->number_of_packets = nframe) > 0) {
if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) {
err("could not submit isochronous write URB: %s",
get_usb_statmsg(rc));
dump_urb(DEBUG_ISO, "isoc write", urb);
return rc;
}
++ubc->numsub;
}
return nframe;
}
/* write_iso_tasklet
* tasklet scheduled when an isochronous output URB from the Gigaset device
* has completed
* parameter:
* data B channel state structure
*/
static void write_iso_tasklet(unsigned long data)
{
struct bc_state *bcs;
struct bas_bc_state *ubc;
struct cardstate *cs;
struct isow_urbctx_t *done, *next, *ovfl;
struct urb *urb;
struct usb_iso_packet_descriptor *ifd;
int offset;
unsigned long flags;
int i;
struct sk_buff *skb;
int len;
bcs = (struct bc_state *) data;
IFNULLRET(bcs);
ubc = bcs->hw.bas;
IFNULLRET(ubc);
cs = bcs->cs;
IFNULLRET(cs);
/* loop while completed URBs arrive in time */
for (;;) {
if (unlikely(!atomic_read(&cs->connected))) {
warn("%s: disconnected", __func__);
return;
}
if (unlikely(!(atomic_read(&ubc->running)))) {
dbg(DEBUG_ISO, "%s: not running", __func__);
return;
}
/* retrieve completed URBs */
spin_lock_irqsave(&ubc->isooutlock, flags);
done = ubc->isooutdone;
ubc->isooutdone = NULL;
ovfl = ubc->isooutovfl;
ubc->isooutovfl = NULL;
spin_unlock_irqrestore(&ubc->isooutlock, flags);
if (ovfl) {
err("isochronous write buffer underrun - buy a faster machine :-)");
error_hangup(bcs);
break;
}
if (!done)
break;
/* submit free URB if available */
spin_lock_irqsave(&ubc->isooutlock, flags);
next = ubc->isooutfree;
ubc->isooutfree = NULL;
spin_unlock_irqrestore(&ubc->isooutlock, flags);
if (next) {
if (submit_iso_write_urb(next) <= 0) {
/* could not submit URB, put it back */
spin_lock_irqsave(&ubc->isooutlock, flags);
if (ubc->isooutfree == NULL) {
ubc->isooutfree = next;
next = NULL;
}
spin_unlock_irqrestore(&ubc->isooutlock, flags);
if (next) {
/* couldn't put it back */
err("losing isochronous write URB");
error_hangup(bcs);
}
}
}
/* process completed URB */
urb = done->urb;
switch (urb->status) {
case 0: /* normal completion */
break;
case -EXDEV: /* inspect individual frames */
/* assumptions (for lack of documentation):
* - actual_length bytes of the frame in error are successfully sent
* - all following frames are not sent at all
*/
dbg(DEBUG_ISO, "%s: URB partially completed", __func__);
offset = done->limit; /* just in case */
for (i = 0; i < BAS_NUMFRAMES; i++) {
ifd = &urb->iso_frame_desc[i];
if (ifd->status ||
ifd->actual_length != ifd->length) {
warn("isochronous write: frame %d: %s, "
"only %d of %d bytes sent",
i, get_usb_statmsg(ifd->status),
ifd->actual_length, ifd->length);
offset = (ifd->offset +
ifd->actual_length)
% BAS_OUTBUFSIZE;
break;
}
}
#ifdef CONFIG_GIGASET_DEBUG
/* check assumption on remaining frames */
for (; i < BAS_NUMFRAMES; i++) {
ifd = &urb->iso_frame_desc[i];
if (ifd->status != -EINPROGRESS
|| ifd->actual_length != 0) {
warn("isochronous write: frame %d: %s, "
"%d of %d bytes sent",
i, get_usb_statmsg(ifd->status),
ifd->actual_length, ifd->length);
offset = (ifd->offset +
ifd->actual_length)
% BAS_OUTBUFSIZE;
break;
}
}
#endif
break;
case -EPIPE: //FIXME is this the code for "underrun"?
err("isochronous write stalled");
error_hangup(bcs);
break;
default: /* severe trouble */
warn("isochronous write: %s",
get_usb_statmsg(urb->status));
}
/* mark the write buffer area covered by this URB as free */
if (done->limit >= 0)
atomic_set(&ubc->isooutbuf->read, done->limit);
/* mark URB as free */
spin_lock_irqsave(&ubc->isooutlock, flags);
next = ubc->isooutfree;
ubc->isooutfree = done;
spin_unlock_irqrestore(&ubc->isooutlock, flags);
if (next) {
/* only one URB still active - resubmit one */
if (submit_iso_write_urb(next) <= 0) {
/* couldn't submit */
error_hangup(bcs);
}
}
}
/* process queued SKBs */
while ((skb = skb_dequeue(&bcs->squeue))) {
/* copy to output buffer, doing L2 encapsulation */
len = skb->len;
if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
/* insufficient buffer space, push back onto queue */
skb_queue_head(&bcs->squeue, skb);
dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
__func__, skb_queue_len(&bcs->squeue));
break;
}
skb_pull(skb, len);
gigaset_skb_sent(bcs, skb);
dev_kfree_skb_any(skb);
}
}
/* Isochronous Read - Bottom Half */
/* ============================== */
/* read_iso_tasklet
* tasklet scheduled when an isochronous input URB from the Gigaset device
* has completed
* parameter:
* data B channel state structure
*/
static void read_iso_tasklet(unsigned long data)
{
struct bc_state *bcs;
struct bas_bc_state *ubc;
struct cardstate *cs;
struct urb *urb;
char *rcvbuf;
unsigned long flags;
int totleft, numbytes, offset, frame, rc;
bcs = (struct bc_state *) data;
IFNULLRET(bcs);
ubc = bcs->hw.bas;
IFNULLRET(ubc);
cs = bcs->cs;
IFNULLRET(cs);
/* loop while more completed URBs arrive in the meantime */
for (;;) {
if (!atomic_read(&cs->connected)) {
warn("%s: disconnected", __func__);
return;
}
/* retrieve URB */
spin_lock_irqsave(&ubc->isoinlock, flags);
if (!(urb = ubc->isoindone)) {
spin_unlock_irqrestore(&ubc->isoinlock, flags);
return;
}
ubc->isoindone = NULL;
if (unlikely(ubc->loststatus != -EINPROGRESS)) {
warn("isochronous read overrun, dropped URB with status: %s, %d bytes lost",
get_usb_statmsg(ubc->loststatus), ubc->isoinlost);
ubc->loststatus = -EINPROGRESS;
}
spin_unlock_irqrestore(&ubc->isoinlock, flags);
if (unlikely(!(atomic_read(&ubc->running)))) {
dbg(DEBUG_ISO, "%s: channel not running, dropped URB with status: %s",
__func__, get_usb_statmsg(urb->status));
return;
}
switch (urb->status) {
case 0: /* normal completion */
break;
case -EXDEV: /* inspect individual frames (we do that anyway) */
dbg(DEBUG_ISO, "%s: URB partially completed", __func__);
break;
case -ENOENT:
case -ECONNRESET:
dbg(DEBUG_ISO, "%s: URB canceled", __func__);
continue; /* -> skip */
case -EINPROGRESS: /* huh? */
dbg(DEBUG_ISO, "%s: URB still pending", __func__);
continue; /* -> skip */
case -EPIPE:
err("isochronous read stalled");
error_hangup(bcs);
continue; /* -> skip */
default: /* severe trouble */
warn("isochronous read: %s",
get_usb_statmsg(urb->status));
goto error;
}
rcvbuf = urb->transfer_buffer;
totleft = urb->actual_length;
for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
if (unlikely(urb->iso_frame_desc[frame].status)) {
warn("isochronous read: frame %d: %s",
frame, get_usb_statmsg(urb->iso_frame_desc[frame].status));
break;
}
numbytes = urb->iso_frame_desc[frame].actual_length;
if (unlikely(numbytes > BAS_MAXFRAME)) {
warn("isochronous read: frame %d: numbytes (%d) > BAS_MAXFRAME",
frame, numbytes);
break;
}
if (unlikely(numbytes > totleft)) {
warn("isochronous read: frame %d: numbytes (%d) > totleft (%d)",
frame, numbytes, totleft);
break;
}
offset = urb->iso_frame_desc[frame].offset;
if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
warn("isochronous read: frame %d: offset (%d) + numbytes (%d) > BAS_INBUFSIZE",
frame, offset, numbytes);
break;
}
gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
totleft -= numbytes;
}
if (unlikely(totleft > 0))
warn("isochronous read: %d data bytes missing",
totleft);
error:
/* URB processed, resubmit */
for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
urb->iso_frame_desc[frame].status = 0;
urb->iso_frame_desc[frame].actual_length = 0;
}
urb->dev = bcs->cs->hw.bas->udev; /* clobbered by USB subsystem */
urb->transfer_flags = URB_ISO_ASAP;
urb->number_of_packets = BAS_NUMFRAMES;
if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) {
err("could not resubmit isochronous read URB: %s",
get_usb_statmsg(rc));
dump_urb(DEBUG_ISO, "resubmit iso read", urb);
error_hangup(bcs);
}
}
}
/* Channel Operations */
/* ================== */
/* req_timeout
* timeout routine for control output request
* argument:
* B channel control structure
*/
static void req_timeout(unsigned long data)
{
struct bc_state *bcs = (struct bc_state *) data;
struct bas_cardstate *ucs;
int pending;
unsigned long flags;
IFNULLRET(bcs);
IFNULLRET(bcs->cs);
ucs = bcs->cs->hw.bas;
IFNULLRET(ucs);
check_pending(ucs);
spin_lock_irqsave(&ucs->lock, flags);
pending = ucs->pending;
ucs->pending = 0;
spin_unlock_irqrestore(&ucs->lock, flags);
switch (pending) {
case 0: /* no pending request */
dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
break;
case HD_OPEN_ATCHANNEL:
err("timeout opening AT channel");
error_reset(bcs->cs);
break;
case HD_OPEN_B2CHANNEL:
case HD_OPEN_B1CHANNEL:
err("timeout opening channel %d", bcs->channel + 1);
error_hangup(bcs);
break;
case HD_CLOSE_ATCHANNEL:
err("timeout closing AT channel");
//wake_up_interruptible(cs->initwait);
//FIXME need own wait queue?
break;
case HD_CLOSE_B2CHANNEL:
case HD_CLOSE_B1CHANNEL:
err("timeout closing channel %d", bcs->channel + 1);
break;
default:
warn("request 0x%02x timed out, clearing", pending);
}
}
/* write_ctrl_callback
* USB completion handler for control pipe output
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block of completed request
* urb->context = hardware specific controller state structure
*/
static void write_ctrl_callback(struct urb *urb, struct pt_regs *regs)
{
struct bas_cardstate *ucs;
unsigned long flags;
IFNULLRET(urb);
IFNULLRET(urb->context);
IFNULLRET(cardstate);
ucs = (struct bas_cardstate *) urb->context;
spin_lock_irqsave(&ucs->lock, flags);
if (urb->status && ucs->pending) {
err("control request 0x%02x failed: %s",
ucs->pending, get_usb_statmsg(urb->status));
del_timer(&ucs->timer_ctrl);
ucs->pending = 0;
}
/* individual handling of specific request types */
switch (ucs->pending) {
case HD_DEVICE_INIT_ACK: /* no reply expected */
ucs->pending = 0;
break;
}
spin_unlock_irqrestore(&ucs->lock, flags);
}
/* req_submit
* submit a control output request without message buffer to the Gigaset base
* and optionally start a timeout
* parameters:
* bcs B channel control structure
* req control request code (HD_*)
* val control request parameter value (set to 0 if unused)
* timeout timeout in seconds (0: no timeout)
* return value:
* 0 on success
* -EINVAL if a NULL pointer is encountered somewhere
* -EBUSY if another request is pending
* any URB submission error code
*/
static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
{
struct bas_cardstate *ucs;
int ret;
unsigned long flags;
IFNULLRETVAL(bcs, -EINVAL);
IFNULLRETVAL(bcs->cs, -EINVAL);
ucs = bcs->cs->hw.bas;
IFNULLRETVAL(ucs, -EINVAL);
IFNULLRETVAL(ucs->urb_ctrl, -EINVAL);
dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
spin_lock_irqsave(&ucs->lock, flags);
if (ucs->pending) {
spin_unlock_irqrestore(&ucs->lock, flags);
err("submission of request 0x%02x failed: request 0x%02x still pending",
req, ucs->pending);
return -EBUSY;
}
if (ucs->urb_ctrl->status == -EINPROGRESS) {
spin_unlock_irqrestore(&ucs->lock, flags);
err("could not submit request 0x%02x: URB busy", req);
return -EBUSY;
}
ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
ucs->dr_ctrl.bRequest = req;
ucs->dr_ctrl.wValue = cpu_to_le16(val);
ucs->dr_ctrl.wIndex = 0;
ucs->dr_ctrl.wLength = 0;
usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
usb_sndctrlpipe(ucs->udev, 0),
(unsigned char*) &ucs->dr_ctrl, NULL, 0,
write_ctrl_callback, ucs);
if ((ret = usb_submit_urb(ucs->urb_ctrl, SLAB_ATOMIC)) != 0) {
err("could not submit request 0x%02x: %s",
req, get_usb_statmsg(ret));
spin_unlock_irqrestore(&ucs->lock, flags);
return ret;
}
ucs->pending = req;
if (timeout > 0) {
dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
ucs->timer_ctrl.data = (unsigned long) bcs;
ucs->timer_ctrl.function = req_timeout;
add_timer(&ucs->timer_ctrl);
}
spin_unlock_irqrestore(&ucs->lock, flags);
return 0;
}
/* gigaset_init_bchannel
* called by common.c to connect a B channel
* initialize isochronous I/O and tell the Gigaset base to open the channel
* argument:
* B channel control structure
* return value:
* 0 on success, error code < 0 on error
*/
static int gigaset_init_bchannel(struct bc_state *bcs)
{
int req, ret;
IFNULLRETVAL(bcs, -EINVAL);
if ((ret = starturbs(bcs)) < 0) {
err("could not start isochronous I/O for channel %d",
bcs->channel + 1);
error_hangup(bcs);
return ret;
}
req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0) {
err("could not open channel %d: %s",
bcs->channel + 1, get_usb_statmsg(ret));
stopurbs(bcs->hw.bas);
error_hangup(bcs);
}
return ret;
}
/* gigaset_close_bchannel
* called by common.c to disconnect a B channel
* tell the Gigaset base to close the channel
* stopping isochronous I/O and LL notification will be done when the
* acknowledgement for the close arrives
* argument:
* B channel control structure
* return value:
* 0 on success, error code < 0 on error
*/
static int gigaset_close_bchannel(struct bc_state *bcs)
{
int req, ret;
IFNULLRETVAL(bcs, -EINVAL);
if (!(atomic_read(&bcs->cs->hw.bas->basstate) &
(bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
/* channel not running: just signal common.c */
gigaset_bchannel_down(bcs);
return 0;
}
req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0)
err("could not submit HD_CLOSE_BxCHANNEL request: %s",
get_usb_statmsg(ret));
return ret;
}
/* Device Operations */
/* ================= */
/* complete_cb
* unqueue first command buffer from queue, waking any sleepers
* must be called with cs->cmdlock held
* parameter:
* cs controller state structure
*/
static void complete_cb(struct cardstate *cs)
{
struct cmdbuf_t *cb;
IFNULLRET(cs);
cb = cs->cmdbuf;
IFNULLRET(cb);
/* unqueue completed buffer */
cs->cmdbytes -= cs->curlen;
dbg(DEBUG_TRANSCMD | DEBUG_LOCKCMD,
"write_command: sent %u bytes, %u left",
cs->curlen, cs->cmdbytes);
if ((cs->cmdbuf = cb->next) != NULL) {
cs->cmdbuf->prev = NULL;
cs->curlen = cs->cmdbuf->len;
} else {
cs->lastcmdbuf = NULL;
cs->curlen = 0;
}
if (cb->wake_tasklet)
tasklet_schedule(cb->wake_tasklet);
kfree(cb);
}
static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len);
/* write_command_callback
* USB completion handler for AT command transmission
* called by the USB subsystem in interrupt context
* parameter:
* urb USB request block of completed request
* urb->context = controller state structure
*/
static void write_command_callback(struct urb *urb, struct pt_regs *regs)
{
struct cardstate *cs;
unsigned long flags;
struct bas_cardstate *ucs;
IFNULLRET(urb);
cs = (struct cardstate *) urb->context;
IFNULLRET(cs);
ucs = cs->hw.bas;
IFNULLRET(ucs);
/* check status */
switch (urb->status) {
case 0: /* normal completion */
break;
case -ENOENT: /* canceled */
case -ECONNRESET: /* canceled (async) */
case -EINPROGRESS: /* pending */
/* ignore silently */
dbg(DEBUG_USBREQ,
"%s: %s", __func__, get_usb_statmsg(urb->status));
return;
default: /* any failure */
if (++ucs->retry_cmd_out > BAS_RETRY) {
warn("command write: %s, giving up after %d retries",
get_usb_statmsg(urb->status), ucs->retry_cmd_out);
break;
}
if (cs->cmdbuf == NULL) {
warn("command write: %s, cannot retry - cmdbuf gone",
get_usb_statmsg(urb->status));
break;
}
notice("command write: %s, retry %d",
get_usb_statmsg(urb->status), ucs->retry_cmd_out);
if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
/* resubmitted - bypass regular exit block */
return;
/* command send failed, assume base still waiting */
update_basstate(ucs, BS_ATREADY, 0);
}
spin_lock_irqsave(&cs->cmdlock, flags);
if (cs->cmdbuf != NULL)
complete_cb(cs);
spin_unlock_irqrestore(&cs->cmdlock, flags);
}
/* atrdy_timeout
* timeout routine for AT command transmission
* argument:
* controller state structure
*/
static void atrdy_timeout(unsigned long data)
{
struct cardstate *cs = (struct cardstate *) data;
struct bas_cardstate *ucs;
IFNULLRET(cs);
ucs = cs->hw.bas;
IFNULLRET(ucs);
warn("timeout waiting for HD_READY_SEND_ATDATA");
/* fake the missing signal - what else can I do? */
update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
start_cbsend(cs);
}
/* atwrite_submit
* submit an HD_WRITE_ATMESSAGE command URB
* parameters:
* cs controller state structure
* buf buffer containing command to send
* len length of command to send
* return value:
* 0 on success
* -EFAULT if a NULL pointer is encountered somewhere
* -EBUSY if another request is pending
* any URB submission error code
*/
static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
{
struct bas_cardstate *ucs;
int ret;
IFNULLRETVAL(cs, -EFAULT);
ucs = cs->hw.bas;
IFNULLRETVAL(ucs, -EFAULT);
IFNULLRETVAL(ucs->urb_cmd_out, -EFAULT);
dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
if (ucs->urb_cmd_out->status == -EINPROGRESS) {
err("could not submit HD_WRITE_ATMESSAGE: URB busy");
return -EBUSY;
}
ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
ucs->dr_cmd_out.wValue = 0;
ucs->dr_cmd_out.wIndex = 0;
ucs->dr_cmd_out.wLength = cpu_to_le16(len);
usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
usb_sndctrlpipe(ucs->udev, 0),
(unsigned char*) &ucs->dr_cmd_out, buf, len,
write_command_callback, cs);
if ((ret = usb_submit_urb(ucs->urb_cmd_out, SLAB_ATOMIC)) != 0) {
err("could not submit HD_WRITE_ATMESSAGE: %s",
get_usb_statmsg(ret));
return ret;
}
/* submitted successfully */
update_basstate(ucs, 0, BS_ATREADY);
/* start timeout if necessary */
if (!(atomic_read(&ucs->basstate) & BS_ATTIMER)) {
dbg(DEBUG_OUTPUT,
"setting ATREADY timeout of %d/10 secs", ATRDY_TIMEOUT);
ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
ucs->timer_atrdy.data = (unsigned long) cs;
ucs->timer_atrdy.function = atrdy_timeout;
add_timer(&ucs->timer_atrdy);
update_basstate(ucs, BS_ATTIMER, 0);
}
return 0;
}
/* start_cbsend
* start transmission of AT command queue if necessary
* parameter:
* cs controller state structure
* return value:
* 0 on success
* error code < 0 on error
*/
static int start_cbsend(struct cardstate *cs)
{
struct cmdbuf_t *cb;
struct bas_cardstate *ucs;
unsigned long flags;
int rc;
int retval = 0;
IFNULLRETVAL(cs, -EFAULT);
ucs = cs->hw.bas;
IFNULLRETVAL(ucs, -EFAULT);
/* check if AT channel is open */
if (!(atomic_read(&ucs->basstate) & BS_ATOPEN)) {
dbg(DEBUG_TRANSCMD | DEBUG_LOCKCMD, "AT channel not open");
rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
if (rc < 0) {
err("could not open AT channel");
/* flush command queue */
spin_lock_irqsave(&cs->cmdlock, flags);
while (cs->cmdbuf != NULL)
complete_cb(cs);
spin_unlock_irqrestore(&cs->cmdlock, flags);
}
return rc;
}
/* try to send first command in queue */
spin_lock_irqsave(&cs->cmdlock, flags);
while ((cb = cs->cmdbuf) != NULL &&
atomic_read(&ucs->basstate) & BS_ATREADY) {
ucs->retry_cmd_out = 0;
rc = atwrite_submit(cs, cb->buf, cb->len);
if (unlikely(rc)) {
retval = rc;
complete_cb(cs);
}
}
spin_unlock_irqrestore(&cs->cmdlock, flags);
return retval;
}
/* gigaset_write_cmd
* This function is called by the device independent part of the driver
* to transmit an AT command string to the Gigaset device.
* It encapsulates the device specific method for transmission over the
* direct USB connection to the base.
* The command string is added to the queue of commands to send, and
* USB transmission is started if necessary.
* parameters:
* cs controller state structure
* buf command string to send
* len number of bytes to send (max. IF_WRITEBUF)
* wake_tasklet tasklet to run when transmission is completed (NULL if none)
* return value:
* number of bytes queued on success
* error code < 0 on error
*/
static int gigaset_write_cmd(struct cardstate *cs,
const unsigned char *buf, int len,
struct tasklet_struct *wake_tasklet)
{
struct cmdbuf_t *cb;
unsigned long flags;
int status;
gigaset_dbg_buffer(atomic_read(&cs->mstate) != MS_LOCKED ?
DEBUG_TRANSCMD : DEBUG_LOCKCMD,
"CMD Transmit", len, buf, 0);
if (!atomic_read(&cs->connected)) {
err("%s: not connected", __func__);
return -ENODEV;
}
if (len <= 0)
return 0; /* nothing to do */
if (len > IF_WRITEBUF)
len = IF_WRITEBUF;
if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
err("%s: out of memory", __func__);
return -ENOMEM;
}
memcpy(cb->buf, buf, len);
cb->len = len;
cb->offset = 0;
cb->next = NULL;
cb->wake_tasklet = wake_tasklet;
spin_lock_irqsave(&cs->cmdlock, flags);
cb->prev = cs->lastcmdbuf;
if (cs->lastcmdbuf)
cs->lastcmdbuf->next = cb;
else {
cs->cmdbuf = cb;
cs->curlen = len;
}
cs->cmdbytes += len;
cs->lastcmdbuf = cb;
spin_unlock_irqrestore(&cs->cmdlock, flags);
status = start_cbsend(cs);
return status < 0 ? status : len;
}
/* gigaset_write_room
* tty_driver.write_room interface routine
* return number of characters the driver will accept to be written via gigaset_write_cmd
* parameter:
* controller state structure
* return value:
* number of characters
*/
static int gigaset_write_room(struct cardstate *cs)
{
return IF_WRITEBUF;
}
/* gigaset_chars_in_buffer
* tty_driver.chars_in_buffer interface routine
* return number of characters waiting to be sent
* parameter:
* controller state structure
* return value:
* number of characters
*/
static int gigaset_chars_in_buffer(struct cardstate *cs)
{
unsigned long flags;
unsigned bytes;
spin_lock_irqsave(&cs->cmdlock, flags);
bytes = cs->cmdbytes;
spin_unlock_irqrestore(&cs->cmdlock, flags);
return bytes;
}
/* gigaset_brkchars
* implementation of ioctl(GIGASET_BRKCHARS)
* parameter:
* controller state structure
* return value:
* -EINVAL (unimplemented function)
*/
static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
{
return -EINVAL;
}
/* Device Initialization/Shutdown */
/* ============================== */
/* Free hardware dependent part of the B channel structure
* parameter:
* bcs B channel structure
* return value:
* !=0 on success
*/
static int gigaset_freebcshw(struct bc_state *bcs)
{
if (!bcs->hw.bas)
return 0;
if (bcs->hw.bas->isooutbuf)
kfree(bcs->hw.bas->isooutbuf);
kfree(bcs->hw.bas);
bcs->hw.bas = NULL;
return 1;
}
/* Initialize hardware dependent part of the B channel structure
* parameter:
* bcs B channel structure
* return value:
* !=0 on success
*/
static int gigaset_initbcshw(struct bc_state *bcs)
{
int i;
struct bas_bc_state *ubc;
bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
if (!ubc) {
err("could not allocate bas_bc_state");
return 0;
}
atomic_set(&ubc->running, 0);
atomic_set(&ubc->corrbytes, 0);
spin_lock_init(&ubc->isooutlock);
for (i = 0; i < BAS_OUTURBS; ++i) {
ubc->isoouturbs[i].urb = NULL;
ubc->isoouturbs[i].bcs = bcs;
}
ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
ubc->numsub = 0;
if (!(ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL))) {
err("could not allocate isochronous output buffer");
kfree(ubc);
bcs->hw.bas = NULL;
return 0;
}
tasklet_init(&ubc->sent_tasklet,
&write_iso_tasklet, (unsigned long) bcs);
spin_lock_init(&ubc->isoinlock);
for (i = 0; i < BAS_INURBS; ++i)
ubc->isoinurbs[i] = NULL;
ubc->isoindone = NULL;
ubc->loststatus = -EINPROGRESS;
ubc->isoinlost = 0;
ubc->seqlen = 0;
ubc->inbyte = 0;
ubc->inbits = 0;
ubc->goodbytes = 0;
ubc->alignerrs = 0;
ubc->fcserrs = 0;
ubc->frameerrs = 0;
ubc->giants = 0;
ubc->runts = 0;
ubc->aborts = 0;
ubc->shared0s = 0;
ubc->stolen0s = 0;
tasklet_init(&ubc->rcvd_tasklet,
&read_iso_tasklet, (unsigned long) bcs);
return 1;
}
static void gigaset_reinitbcshw(struct bc_state *bcs)
{
struct bas_bc_state *ubc = bcs->hw.bas;
atomic_set(&bcs->hw.bas->running, 0);
atomic_set(&bcs->hw.bas->corrbytes, 0);
bcs->hw.bas->numsub = 0;
spin_lock_init(&ubc->isooutlock);
spin_lock_init(&ubc->isoinlock);
ubc->loststatus = -EINPROGRESS;
}
static void gigaset_freecshw(struct cardstate *cs)
{
struct bas_cardstate *ucs = cs->hw.bas;
del_timer(&ucs->timer_ctrl);
del_timer(&ucs->timer_atrdy);
del_timer(&ucs->timer_cmd_in);
kfree(cs->hw.bas);
}
static int gigaset_initcshw(struct cardstate *cs)
{
struct bas_cardstate *ucs;
cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
if (!ucs)
return 0;
ucs->urb_cmd_in = NULL;
ucs->urb_cmd_out = NULL;
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
spin_lock_init(&ucs->lock);
ucs->pending = 0;
atomic_set(&ucs->basstate, 0);
init_timer(&ucs->timer_ctrl);
init_timer(&ucs->timer_atrdy);
init_timer(&ucs->timer_cmd_in);
return 1;
}
/* freeurbs
* unlink and deallocate all URBs unconditionally
* caller must make sure that no commands are still in progress
* parameter:
* cs controller state structure
*/
static void freeurbs(struct cardstate *cs)
{
struct bas_cardstate *ucs;
struct bas_bc_state *ubc;
int i, j;
IFNULLRET(cs);
ucs = cs->hw.bas;
IFNULLRET(ucs);
for (j = 0; j < 2; ++j) {
ubc = cs->bcs[j].hw.bas;
IFNULLCONT(ubc);
for (i = 0; i < BAS_OUTURBS; ++i)
if (ubc->isoouturbs[i].urb) {
usb_kill_urb(ubc->isoouturbs[i].urb);
dbg(DEBUG_INIT,
"%s: isoc output URB %d/%d unlinked",
__func__, j, i);
usb_free_urb(ubc->isoouturbs[i].urb);
ubc->isoouturbs[i].urb = NULL;
}
for (i = 0; i < BAS_INURBS; ++i)
if (ubc->isoinurbs[i]) {
usb_kill_urb(ubc->isoinurbs[i]);
dbg(DEBUG_INIT,
"%s: isoc input URB %d/%d unlinked",
__func__, j, i);
usb_free_urb(ubc->isoinurbs[i]);
ubc->isoinurbs[i] = NULL;
}
}
if (ucs->urb_int_in) {
usb_kill_urb(ucs->urb_int_in);
dbg(DEBUG_INIT, "%s: interrupt input URB unlinked", __func__);
usb_free_urb(ucs->urb_int_in);
ucs->urb_int_in = NULL;
}
if (ucs->urb_cmd_out) {
usb_kill_urb(ucs->urb_cmd_out);
dbg(DEBUG_INIT, "%s: command output URB unlinked", __func__);
usb_free_urb(ucs->urb_cmd_out);
ucs->urb_cmd_out = NULL;
}
if (ucs->urb_cmd_in) {
usb_kill_urb(ucs->urb_cmd_in);
dbg(DEBUG_INIT, "%s: command input URB unlinked", __func__);
usb_free_urb(ucs->urb_cmd_in);
ucs->urb_cmd_in = NULL;
}
if (ucs->urb_ctrl) {
usb_kill_urb(ucs->urb_ctrl);
dbg(DEBUG_INIT, "%s: control output URB unlinked", __func__);
usb_free_urb(ucs->urb_ctrl);
ucs->urb_ctrl = NULL;
}
}
/* gigaset_probe
* This function is called when a new USB device is connected.
* It checks whether the new device is handled by this driver.
*/
static int gigaset_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_host_interface *hostif;
struct usb_device *udev = interface_to_usbdev(interface);
struct cardstate *cs = NULL;
struct bas_cardstate *ucs = NULL;
struct bas_bc_state *ubc;
struct usb_endpoint_descriptor *endpoint;
int i, j;
int ret;
IFNULLRETVAL(udev, -ENODEV);
dbg(DEBUG_ANY,
"%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
__func__, le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct));
/* See if the device offered us matches what we can accept */
if ((le16_to_cpu(udev->descriptor.idVendor) != USB_GIGA_VENDOR_ID) ||
(le16_to_cpu(udev->descriptor.idProduct) != USB_GIGA_PRODUCT_ID &&
le16_to_cpu(udev->descriptor.idProduct) != USB_4175_PRODUCT_ID &&
le16_to_cpu(udev->descriptor.idProduct) != USB_SX303_PRODUCT_ID &&
le16_to_cpu(udev->descriptor.idProduct) != USB_SX353_PRODUCT_ID)) {
dbg(DEBUG_ANY, "%s: unmatched ID - exiting", __func__);
return -ENODEV;
}
/* set required alternate setting */
hostif = interface->cur_altsetting;
if (hostif->desc.bAlternateSetting != 3) {
dbg(DEBUG_ANY,
"%s: wrong alternate setting %d - trying to switch",
__func__, hostif->desc.bAlternateSetting);
if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3) < 0) {
warn("usb_set_interface failed, device %d interface %d altsetting %d",
udev->devnum, hostif->desc.bInterfaceNumber,
hostif->desc.bAlternateSetting);
return -ENODEV;
}
hostif = interface->cur_altsetting;
}
/* Reject application specific interfaces
*/
if (hostif->desc.bInterfaceClass != 255) {
warn("%s: bInterfaceClass == %d",
__func__, hostif->desc.bInterfaceClass);
return -ENODEV;
}
info("%s: Device matched (Vendor: 0x%x, Product: 0x%x)",
__func__, le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct));
cs = gigaset_getunassignedcs(driver);
if (!cs) {
err("%s: no free cardstate", __func__);
return -ENODEV;
}
ucs = cs->hw.bas;
ucs->udev = udev;
ucs->interface = interface;
/* allocate URBs:
* - one for the interrupt pipe
* - three for the different uses of the default control pipe
* - three for each isochronous pipe
*/
ucs->urb_int_in = usb_alloc_urb(0, SLAB_KERNEL);
if (!ucs->urb_int_in) {
err("No free urbs available");
goto error;
}
ucs->urb_cmd_in = usb_alloc_urb(0, SLAB_KERNEL);
if (!ucs->urb_cmd_in) {
err("No free urbs available");
goto error;
}
ucs->urb_cmd_out = usb_alloc_urb(0, SLAB_KERNEL);
if (!ucs->urb_cmd_out) {
err("No free urbs available");
goto error;
}
ucs->urb_ctrl = usb_alloc_urb(0, SLAB_KERNEL);
if (!ucs->urb_ctrl) {
err("No free urbs available");
goto error;
}
for (j = 0; j < 2; ++j) {
ubc = cs->bcs[j].hw.bas;
for (i = 0; i < BAS_OUTURBS; ++i) {
ubc->isoouturbs[i].urb =
usb_alloc_urb(BAS_NUMFRAMES, SLAB_KERNEL);
if (!ubc->isoouturbs[i].urb) {
err("No free urbs available");
goto error;
}
}
for (i = 0; i < BAS_INURBS; ++i) {
ubc->isoinurbs[i] =
usb_alloc_urb(BAS_NUMFRAMES, SLAB_KERNEL);
if (!ubc->isoinurbs[i]) {
err("No free urbs available");
goto error;
}
}
}
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
/* Fill the interrupt urb and send it to the core */
endpoint = &hostif->endpoint[0].desc;
usb_fill_int_urb(ucs->urb_int_in, udev,
usb_rcvintpipe(udev,
(endpoint->bEndpointAddress) & 0x0f),
ucs->int_in_buf, 3, read_int_callback, cs,
endpoint->bInterval);
ret = usb_submit_urb(ucs->urb_int_in, SLAB_KERNEL);
if (ret) {
err("could not submit interrupt URB: %s", get_usb_statmsg(ret));
goto error;
}
/* tell the device that the driver is ready */
if ((ret = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0)) != 0)
goto error;
/* tell common part that the device is ready */
if (startmode == SM_LOCKED)
atomic_set(&cs->mstate, MS_LOCKED);
if (!gigaset_start(cs))
goto error;
/* save address of controller structure */
usb_set_intfdata(interface, cs);
/* set up device sysfs */
gigaset_init_dev_sysfs(interface);
return 0;
error:
freeurbs(cs);
gigaset_unassign(cs);
return -ENODEV;
}
/* gigaset_disconnect
* This function is called when the Gigaset base is unplugged.
*/
static void gigaset_disconnect(struct usb_interface *interface)
{
struct cardstate *cs;
struct bas_cardstate *ucs;
/* clear device sysfs */
gigaset_free_dev_sysfs(interface);
cs = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
IFNULLRET(cs);
ucs = cs->hw.bas;
IFNULLRET(ucs);
info("disconnecting GigaSet base");
gigaset_stop(cs);
freeurbs(cs);
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
atomic_set(&ucs->basstate, 0);
gigaset_unassign(cs);
}
static struct gigaset_ops gigops = {
gigaset_write_cmd,
gigaset_write_room,
gigaset_chars_in_buffer,
gigaset_brkchars,
gigaset_init_bchannel,
gigaset_close_bchannel,
gigaset_initbcshw,
gigaset_freebcshw,
gigaset_reinitbcshw,
gigaset_initcshw,
gigaset_freecshw,
gigaset_set_modem_ctrl,
gigaset_baud_rate,
gigaset_set_line_ctrl,
gigaset_isoc_send_skb,
gigaset_isoc_input,
};
/* bas_gigaset_init
* This function is called after the kernel module is loaded.
*/
static int __init bas_gigaset_init(void)
{
int result;
/* allocate memory for our driver state and intialize it */
if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
GIGASET_MODULENAME, GIGASET_DEVNAME,
GIGASET_DEVFSNAME, &gigops,
THIS_MODULE)) == NULL)
goto error;
/* allocate memory for our device state and intialize it */
cardstate = gigaset_initcs(driver, 2, 0, 0, cidmode, GIGASET_MODULENAME);
if (!cardstate)
goto error;
/* register this driver with the USB subsystem */
result = usb_register(&gigaset_usb_driver);
if (result < 0) {
err("usb_register failed (error %d)", -result);
goto error;
}
info(DRIVER_AUTHOR);
info(DRIVER_DESC);
return 0;
error: if (cardstate)
gigaset_freecs(cardstate);
cardstate = NULL;
if (driver)
gigaset_freedriver(driver);
driver = NULL;
return -1;
}
/* bas_gigaset_exit
* This function is called before the kernel module is unloaded.
*/
static void __exit bas_gigaset_exit(void)
{
gigaset_blockdriver(driver); /* => probe will fail
* => no gigaset_start any more
*/
gigaset_shutdown(cardstate);
/* from now on, no isdn callback should be possible */
if (atomic_read(&cardstate->hw.bas->basstate) & BS_ATOPEN) {
dbg(DEBUG_ANY, "closing AT channel");
if (req_submit(cardstate->bcs,
HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT) >= 0) {
/* successfully submitted - wait for completion */
//wait_event_interruptible(cs->initwait, !cs->hw.bas->pending);
//FIXME need own wait queue? wakeup?
}
}
/* deregister this driver with the USB subsystem */
usb_deregister(&gigaset_usb_driver);
/* this will call the disconnect-callback */
/* from now on, no disconnect/probe callback should be running */
gigaset_freecs(cardstate);
cardstate = NULL;
gigaset_freedriver(driver);
driver = NULL;
}
module_init(bas_gigaset_init);
module_exit(bas_gigaset_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
