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    Subject[PATCH 7/9] isdn4linux: Siemens Gigaset drivers - direct USB connection
    From: Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>

    This patch adds the main source file of the connection-specific module
    "bas_gigaset", the hardware driver for Gigaset base stations connected
    directly to the computer via USB. It contains the code for handling
    probe/disconnect, AT command/response transmission, and call setup and
    termination.

    Signed-off-by: Hansjoerg Lipp <hjlipp@web.de>
    Signed-off-by: Tilman Schmidt <tilman@imap.cc>
    ---

    drivers/isdn/gigaset/bas-gigaset.c | 2365 +++++++++++++++++++++++++++++++++++++
    1 files changed, 2365 insertions(+)

    --- linux-2.6.16-rc2/drivers/isdn/gigaset/bas-gigaset.c 1970-01-01 01:00:00.000000000 +0100
    +++ linux-2.6.16-rc2-gig/drivers/isdn/gigaset/bas-gigaset.c 2006-02-11 15:20:26.000000000 +0100
    @@ -0,0 +1,2365 @@
    +/*
    + * 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");
    -
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      Last update: 2006-02-11 16:08    [W:0.183 / U:59.176 seconds]
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