bas-gigaset.c 63.5 KB
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/*
 * USB driver for Gigaset 307x base via direct USB connection.
 *
 * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
 *                       Tilman Schmidt <tilman@imap.cc>,
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 *                       Stefan Eilers.
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 *
 * =====================================================================
 *	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.
 * =====================================================================
 */

#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 */
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#define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
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#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"

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/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
#define IF_WRITEBUF 264
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/* Values for the Gigaset 307x */
#define USB_GIGA_VENDOR_ID      0x0681
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#define USB_3070_PRODUCT_ID     0x0001
#define USB_3075_PRODUCT_ID     0x0002
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#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 [] = {
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	{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
	{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
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	{ 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);

/*======================= 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);

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static void read_ctrl_callback(struct urb *, struct pt_regs *);
static void stopurbs(struct bas_bc_state *);
static int atwrite_submit(struct cardstate *, unsigned char *, int);
static int start_cbsend(struct cardstate *);
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/*==============================================================================*/

struct bas_cardstate {
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	struct usb_device	*udev;		/* USB device pointer */
	struct usb_interface	*interface;	/* interface for this device */
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	unsigned char		minor;		/* starting minor number */

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	struct urb		*urb_ctrl;	/* control pipe default URB */
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	struct usb_ctrlrequest	dr_ctrl;
	struct timer_list	timer_ctrl;	/* control request timeout */

	struct timer_list	timer_atrdy;	/* AT command ready timeout */
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	struct urb		*urb_cmd_out;	/* for sending AT commands */
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	struct usb_ctrlrequest	dr_cmd_out;
	int			retry_cmd_out;

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	struct urb		*urb_cmd_in;	/* for receiving AT replies */
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	struct usb_ctrlrequest	dr_cmd_in;
	struct timer_list	timer_cmd_in;	/* receive request timeout */
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	unsigned char		*rcvbuf;	/* AT reply receive buffer */
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	struct urb		*urb_int_in;	/* URB for interrupt pipe */
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	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) */
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#define BS_ATOPEN	0x001	/* AT channel open */
#define BS_B1OPEN	0x002	/* B channel 1 open */
#define BS_B2OPEN	0x004	/* B channel 2 open */
#define BS_ATREADY	0x008	/* base ready for AT command */
#define BS_INIT		0x010	/* base has signalled INIT_OK */
#define BS_ATTIMER	0x020	/* waiting for HD_READY_SEND_ATDATA */
#define BS_ATRDPEND	0x040	/* urb_cmd_in in use */
#define BS_ATWRPEND	0x080	/* urb_cmd_out in use */
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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,
};

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/* get message text for usb_submit_urb return code
 */
static char *get_usb_rcmsg(int rc)
{
	static char unkmsg[28];

	switch (rc) {
	case 0:
		return "success";
	case -ENOMEM:
		return "out of memory";
	case -ENODEV:
		return "device not present";
	case -ENOENT:
		return "endpoint not present";
	case -ENXIO:
		return "URB type not supported";
	case -EINVAL:
		return "invalid argument";
	case -EAGAIN:
		return "start frame too early or too much scheduled";
	case -EFBIG:
		return "too many isochronous frames requested";
	case -EPIPE:
		return "endpoint stalled";
	case -EMSGSIZE:
		return "invalid packet size";
	case -ENOSPC:
		return "would overcommit USB bandwidth";
	case -ESHUTDOWN:
		return "device shut down";
	case -EPERM:
		return "reject flag set";
	case -EHOSTUNREACH:
		return "device suspended";
	default:
		snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
		return unkmsg;
	}
}

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/* 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:
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		return "unlinked (sync)";
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	case -EINPROGRESS:
		return "pending";
	case -EPROTO:
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		return "bit stuffing error, timeout, or unknown USB error";
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	case -EILSEQ:
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		return "CRC mismatch, timeout, or unknown USB error";
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	case -ETIMEDOUT:
		return "timed out";
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	case -EPIPE:
		return "endpoint stalled";
	case -ECOMM:
		return "IN buffer overrun";
	case -ENOSR:
		return "OUT buffer underrun";
	case -EOVERFLOW:
		return "too much data";
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	case -EREMOTEIO:
		return "short packet detected";
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	case -ENODEV:
		return "device removed";
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	case -EXDEV:
		return "partial isochronous transfer";
	case -EINVAL:
		return "invalid argument";
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	case -ECONNRESET:
		return "unlinked (async)";
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	case -ESHUTDOWN:
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		return "device shut down";
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	default:
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		snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
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		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,
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			    struct urb *urb)
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{
#ifdef CONFIG_GIGASET_DEBUG
	int i;
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	gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
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	if (urb) {
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		gig_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);
		gig_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);
		gig_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);
		gig_dbg(level,
			"  context=0x%08lx, complete=0x%08lx, "
			"iso_frame_desc[]={",
			(unsigned long) urb->context,
			(unsigned long) urb->complete);
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		for (i = 0; i < urb->number_of_packets; i++) {
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			struct usb_iso_packet_descriptor *pifd
				= &urb->iso_frame_desc[i];
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			gig_dbg(level,
				"    {offset=%u, length=%u, actual_length=%u, "
				"status=%u}",
				pifd->offset, pifd->length, pifd->actual_length,
				pifd->status);
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		}
	}
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	gig_dbg(level, "}}");
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#endif
}

/* read/set modem control bits etc. (m10x only) */
static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
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				  unsigned new_state)
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{
	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;

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	gig_dbg(DEBUG_ANY, "%s: scheduling HUP for channel %d",
		__func__, bcs->channel);
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	if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL))
		dev_err(cs->dev, "event queue full\n");
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	gigaset_schedule_event(cs);
}

/* error_reset
 * reset Gigaset device because of an unrecoverable error
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 * This function may be called from any context, and should take care of
 * scheduling the necessary actions for execution outside of interrupt context.
 * Right now, it just generates a kernel message calling for help.
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 * argument:
 *	controller state structure
 */
static inline void error_reset(struct cardstate *cs)
{
	//FIXME try to recover without bothering the user
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	dev_err(cs->dev,
	    "unrecoverable error - please disconnect Gigaset base to reset\n");
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}

/* check_pending
 * check for completion of pending control request
 * parameter:
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 *	ucs	hardware specific controller state structure
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 */
static void check_pending(struct bas_cardstate *ucs)
{
	unsigned long flags;

	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;
		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:
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		dev_warn(&ucs->interface->dev,
			 "unknown pending request 0x%02x cleared\n",
			 ucs->pending);
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		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;
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	struct bas_cardstate *ucs = cs->hw.bas;
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	if (!ucs->rcvbuf_size) {
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		gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
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		return;
	}

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	dev_err(cs->dev, "timeout reading AT response\n");
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	error_reset(cs);	//FIXME retry?
}

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/* set/clear bits in base connection state, return previous state
 */
inline static int update_basstate(struct bas_cardstate *ucs,
				  int set, int clear)
{
	unsigned long flags;
	int state;
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	spin_lock_irqsave(&ucs->lock, flags);
	state = atomic_read(&ucs->basstate);
	atomic_set(&ucs->basstate, (state & ~clear) | set);
	spin_unlock_irqrestore(&ucs->lock, flags);
	return state;
}
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/* atread_submit
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 * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
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 * parameters:
 *	cs	controller state structure
 *	timeout	timeout in 1/10 sec., 0: none
 * return value:
 *	0 on success
 *	-EBUSY if another request is pending
 *	any URB submission error code
 */
static int atread_submit(struct cardstate *cs, int timeout)
{
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	struct bas_cardstate *ucs = cs->hw.bas;
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	int ret;

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	gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
		ucs->rcvbuf_size);
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	if (update_basstate(ucs, BS_ATRDPEND, 0) & BS_ATRDPEND) {
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		dev_err(cs->dev,
			"could not submit HD_READ_ATMESSAGE: URB busy\n");
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		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,
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			     usb_rcvctrlpipe(ucs->udev, 0),
			     (unsigned char*) & ucs->dr_cmd_in,
			     ucs->rcvbuf, ucs->rcvbuf_size,
			     read_ctrl_callback, cs->inbuf);
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	if ((ret = usb_submit_urb(ucs->urb_cmd_in, SLAB_ATOMIC)) != 0) {
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		update_basstate(ucs, 0, BS_ATRDPEND);
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		dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
			get_usb_statmsg(ret));
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		return ret;
	}

	if (timeout > 0) {
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		gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
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		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;
}

/* 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)
{
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	struct cardstate *cs = urb->context;
	struct bas_cardstate *ucs = cs->hw.bas;
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	struct bc_state *bcs;
	unsigned long flags;
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	int rc;
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	unsigned l;
	int channel;

	switch (urb->status) {
	case 0:			/* success */
		break;
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	case -ENOENT:			/* cancelled */
	case -ECONNRESET:		/* cancelled (async) */
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	case -EINPROGRESS:		/* pending */
		/* ignore silently */
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		gig_dbg(DEBUG_USBREQ, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
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		return;
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	case -ENODEV:			/* device removed */
	case -ESHUTDOWN:		/* device shut down */
		//FIXME use this as disconnect indicator?
		gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
		return;
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	default:		/* severe trouble */
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		dev_warn(cs->dev, "interrupt read: %s\n",
			 get_usb_statmsg(urb->status));
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		//FIXME corrective action? resubmission always ok?
		goto resubmit;
	}

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	/* drop incomplete packets even if the missing bytes wouldn't matter */
	if (unlikely(urb->actual_length < 3)) {
		dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
			 urb->actual_length);
		goto resubmit;
	}

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	l = (unsigned) ucs->int_in_buf[1] +
	    (((unsigned) ucs->int_in_buf[2]) << 8);

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	gig_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]);
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	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,
580
581
582
583
584
			   &bcs->hw.bas->corrbytes);
		gig_dbg(DEBUG_ISO,
			"Flow control (channel %d, sub %d): 0x%02x => %d",
			channel, bcs->hw.bas->numsub, l,
			atomic_read(&bcs->hw.bas->corrbytes));
585
586
587
588
		break;

	case HD_RECEIVEATDATA_ACK:	/* AT response ready to be received */
		if (!l) {
589
590
			dev_warn(cs->dev,
				"HD_RECEIVEATDATA_ACK with length 0 ignored\n");
591
592
593
594
			break;
		}
		spin_lock_irqsave(&cs->lock, flags);
		if (ucs->rcvbuf_size) {
595
			/* throw away previous buffer - we have no queue */
596
			dev_err(cs->dev,
597
598
599
600
				"receive AT data overrun, %d bytes lost\n",
				ucs->rcvbuf_size);
			kfree(ucs->rcvbuf);
			ucs->rcvbuf_size = 0;
601
602
603
		}
		if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
			spin_unlock_irqrestore(&cs->lock, flags);
604
605
			dev_err(cs->dev, "out of memory receiving AT data\n");
			error_reset(cs);
606
607
608
609
			break;
		}
		ucs->rcvbuf_size = l;
		ucs->retry_cmd_in = 0;
610
		if ((rc = atread_submit(cs, BAS_TIMEOUT)) < 0) {
611
612
613
			kfree(ucs->rcvbuf);
			ucs->rcvbuf = NULL;
			ucs->rcvbuf_size = 0;
614
615
616
			if (rc != -ENODEV)
				//FIXME corrective action?
				error_reset(cs);
617
618
619
620
621
		}
		spin_unlock_irqrestore(&cs->lock, flags);
		break;

	case HD_RESET_INTERRUPT_PIPE_ACK:
622
		gig_dbg(DEBUG_USBREQ, "HD_RESET_INTERRUPT_PIPE_ACK");
623
624
625
		break;

	case HD_SUSPEND_END:
626
		gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
627
628
629
		break;

	default:
630
631
632
		dev_warn(cs->dev,
			 "unknown Gigaset signal 0x%02x (%u) ignored\n",
			 (int) ucs->int_in_buf[0], l);
633
634
635
636
637
	}

	check_pending(ucs);

resubmit:
638
639
	rc = usb_submit_urb(urb, SLAB_ATOMIC);
	if (unlikely(rc != 0 && rc != -ENODEV)) {
640
		dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
641
			get_usb_rcmsg(rc));
642
643
644
645
646
647
648
649
650
651
652
653
654
		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)
{
655
656
657
658
	struct inbuf_t *inbuf = urb->context;
	struct cardstate *cs = inbuf->cs;
	struct bas_cardstate *ucs = cs->hw.bas;
	int have_data = 0;
659
	unsigned numbytes;
660
	int rc;
661

662
	update_basstate(ucs, 0, BS_ATRDPEND);
663
664

	if (!ucs->rcvbuf_size) {
665
		dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
666
667
668
669
670
671
672
673
674
		return;
	}

	del_timer(&ucs->timer_cmd_in);

	switch (urb->status) {
	case 0:				/* normal completion */
		numbytes = urb->actual_length;
		if (unlikely(numbytes == 0)) {
675
676
			dev_warn(cs->dev,
				 "control read: empty block received\n");
677
678
679
			goto retry;
		}
		if (unlikely(numbytes != ucs->rcvbuf_size)) {
680
681
682
			dev_warn(cs->dev,
			       "control read: received %d chars, expected %d\n",
				 numbytes, ucs->rcvbuf_size);
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
			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;

698
699
	case -ENOENT:			/* cancelled */
	case -ECONNRESET:		/* cancelled (async) */
700
	case -EINPROGRESS:		/* pending */
701
702
	case -ENODEV:			/* device removed */
	case -ESHUTDOWN:		/* device shut down */
703
		/* no action necessary */
704
705
		gig_dbg(DEBUG_USBREQ, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
706
707
708
		break;

	default:			/* severe trouble */
709
710
		dev_warn(cs->dev, "control read: %s\n",
			 get_usb_statmsg(urb->status));
711
712
	retry:
		if (ucs->retry_cmd_in++ < BAS_RETRY) {
713
714
			dev_notice(cs->dev, "control read: retry %d\n",
				   ucs->retry_cmd_in);
715
716
717
718
			rc = atread_submit(cs, BAS_TIMEOUT);
			if (rc >= 0 || rc == -ENODEV)
				/* resubmitted or disconnected */
				/* - bypass regular exit block */
719
720
				return;
		} else {
721
722
723
			dev_err(cs->dev,
				"control read: giving up after %d tries\n",
				ucs->retry_cmd_in);
724
725
726
727
728
729
730
731
		}
		error_reset(cs);
	}

	kfree(ucs->rcvbuf);
	ucs->rcvbuf = NULL;
	ucs->rcvbuf_size = 0;
	if (have_data) {
732
		gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
		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;

	/* status codes not worth bothering the tasklet with */
752
753
754
755
756
	if (unlikely(urb->status == -ENOENT ||
		     urb->status == -ECONNRESET ||
		     urb->status == -EINPROGRESS ||
		     urb->status == -ENODEV ||
		     urb->status == -ESHUTDOWN)) {
757
758
		gig_dbg(DEBUG_ISO, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
759
760
761
		return;
	}

762
	bcs = urb->context;
763
764
765
766
767
768
769
770
771
772
773
774
775
	ubc = bcs->hw.bas;

	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 &&
776
777
				     urb->iso_frame_desc[i].status !=
								-EINPROGRESS))
778
779
780
781
782
				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))) {
783
784
			/* urb->dev is clobbered by USB subsystem */
			urb->dev = bcs->cs->hw.bas->udev;
785
786
			urb->transfer_flags = URB_ISO_ASAP;
			urb->number_of_packets = BAS_NUMFRAMES;
787
788
			gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
				__func__);
789
			rc = usb_submit_urb(urb, SLAB_ATOMIC);
790
			if (unlikely(rc != 0 && rc != -ENODEV)) {
791
792
				dev_err(bcs->cs->dev,
					"could not resubmit isochronous read "
793
					"URB: %s\n", get_usb_rcmsg(rc));
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
				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;

	/* status codes not worth bothering the tasklet with */
816
817
818
819
820
	if (unlikely(urb->status == -ENOENT ||
		     urb->status == -ECONNRESET ||
		     urb->status == -EINPROGRESS ||
		     urb->status == -ENODEV ||
		     urb->status == -ESHUTDOWN)) {
821
822
		gig_dbg(DEBUG_ISO, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
823
824
825
826
		return;
	}

	/* pass URB context to tasklet */
827
	ucx = urb->context;
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
	ubc = ucx->bcs->hw.bas;

	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)
{
847
	struct bas_bc_state *ubc = bcs->hw.bas;
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
	struct urb *urb;
	int j, k;
	int rc;

	/* 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) {
			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);
882
		if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0)
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
			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) {
			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);
918
		if (rc != 0)
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
			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;

	atomic_set(&ubc->running, 0);

	for (k = 0; k < BAS_INURBS; ++k) {
		rc = usb_unlink_urb(ubc->isoinurbs[k]);
944
		gig_dbg(DEBUG_ISO,
945
946
			"%s: isoc input URB %d unlinked, result = %s",
			__func__, k, get_usb_rcmsg(rc));
947
948
949
950
	}

	for (k = 0; k < BAS_OUTURBS; ++k) {
		rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
951
		gig_dbg(DEBUG_ISO,
952
953
			"%s: isoc output URB %d unlinked, result = %s",
			__func__, k, get_usb_rcmsg(rc));
954
955
956
957
958
959
960
961
962
	}
}

/* Isochronous Write - Bottom Half */
/* =============================== */

/* submit_iso_write_urb
 * fill and submit the next isochronous write URB
 * parameters:
963
 *	ucx	context structure containing URB
964
965
966
967
968
969
970
 * 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)
{
971
972
	struct urb *urb = ucx->urb;
	struct bas_bc_state *ubc = ucx->bcs->hw.bas;
973
974
975
	struct usb_iso_packet_descriptor *ifd;
	int corrbytes, nframe, rc;

976
977
	/* urb->dev is clobbered by USB subsystem */
	urb->dev = ucx->bcs->cs->hw.bas->udev;
978
979
980
981
982
983
984
985
986
987
	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) {
988
989
			gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
				__func__, corrbytes);
990
991
992
993
994
995
996
997
998
			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);
		}

		/* retrieve block of data to send */
999
1000
		ifd->offset = gigaset_isowbuf_getbytes(ubc->isooutbuf,
						       ifd->length);
1001
1002
		if (ifd->offset < 0) {
			if (ifd->offset == -EBUSY) {
1003
1004
1005
1006
1007
				gig_dbg(DEBUG_ISO,
					"%s: buffer busy at frame %d",
					__func__, nframe);
				/* tasklet will be restarted from
				   gigaset_send_skb() */
1008
			} else {
1009
1010
1011
				dev_err(ucx->bcs->cs->dev,
					"%s: buffer error %d at frame %d\n",
					__func__, ifd->offset, nframe);
1012
1013
1014
1015
1016
1017
1018
1019
				return ifd->offset;
			}
			break;
		}
		ucx->limit = atomic_read(&ubc->isooutbuf->nextread);
		ifd->status = 0;
		ifd->actual_length = 0;
	}
1020
1021
1022
	if (unlikely(nframe == 0))
		return 0;	/* no data to send */
	urb->number_of_packets = nframe;
1023

1024
1025
1026
1027
1028
1029
	rc = usb_submit_urb(urb, SLAB_ATOMIC);
	if (unlikely(rc)) {
		if (rc == -ENODEV)
			/* device removed - give up silently */
			gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
		else
1030
1031
			dev_err(ucx->bcs->cs->dev,
				"could not submit isochronous write URB: %s\n",
1032
1033
				get_usb_rcmsg(rc));
		return rc;
1034
	}
1035
	++ubc->numsub;
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
	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)
{
1047
1048
1049
	struct bc_state *bcs = (struct bc_state *) data;
	struct bas_bc_state *ubc = bcs->hw.bas;
	struct cardstate *cs = bcs->cs;
1050
1051
1052
1053
1054
1055
1056
1057
	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;
1058
	int rc;
1059
1060
1061
1062

	/* loop while completed URBs arrive in time */
	for (;;) {
		if (unlikely(!(atomic_read(&ubc->running)))) {
1063
			gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
			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) {
1075
			dev_err(cs->dev, "isochronous write buffer underrun\n");
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
			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) {
1088
1089
			rc = submit_iso_write_urb(next);
			if (unlikely(rc <= 0 && rc != -ENODEV)) {
1090
1091
1092
1093
1094
1095
1096
1097
1098
				/* 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 */
1099
1100
					dev_err(cs->dev,
					      "losing isochronous write URB\n");
1101
1102
1103
1104
1105
1106
1107
1108
					error_hangup(bcs);
				}
			}
		}

		/* process completed URB */
		urb = done->urb;
		switch (urb->status) {
1109
1110
1111
1112
		case -EXDEV:			/* partial completion */
			gig_dbg(DEBUG_ISO, "%s: URB partially completed",
				__func__);
			/* fall through - what's the difference anyway? */
1113
		case 0:				/* normal completion */
1114
1115
1116
			/* inspect individual frames
			 * assumptions (for lack of documentation):
			 * - actual_length bytes of first frame in error are
1117
			 *   successfully sent
1118
1119
			 * - all following frames are not sent at all
			 */
1120
			offset = done->limit;	/* default (no error) */
1121
1122
1123
1124
			for (i = 0; i < BAS_NUMFRAMES; i++) {
				ifd = &urb->iso_frame_desc[i];
				if (ifd->status ||
				    ifd->actual_length != ifd->length) {
1125
1126
1127
					dev_warn(cs->dev,
					     "isochronous write: frame %d: %s, "
					     "only %d of %d bytes sent\n",
1128
1129
1130
					     i, get_usb_statmsg(ifd->status),
					     ifd->actual_length, ifd->length);
					offset = (ifd->offset +
1131
1132
						  ifd->actual_length)
						 % BAS_OUTBUFSIZE;
1133
1134
1135
1136
1137
1138
1139
1140
1141
					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) {
1142
1143
1144
					dev_warn(cs->dev,
					     "isochronous write: frame %d: %s, "
					     "%d of %d bytes sent\n",
1145
1146
1147
					     i, get_usb_statmsg(ifd->status),
					     ifd->actual_length, ifd->length);
					offset = (ifd->offset +
1148
1149
						  ifd->actual_length)
						 % BAS_OUTBUFSIZE;
1150
1151
1152
1153
1154
					break;
				}
			}
#endif
			break;
1155
		case -EPIPE:			/* stall - probably underrun */
1156
			dev_err(cs->dev, "isochronous write stalled\n");
1157
1158
1159
			error_hangup(bcs);
			break;
		default:			/* severe trouble */
1160
1161
			dev_warn(cs->dev, "isochronous write: %s\n",
				 get_usb_statmsg(urb->status));
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
		}

		/* 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 */
1175
1176
			rc = submit_iso_write_urb(next);
			if (unlikely(rc <= 0 && rc != -ENODEV)) {
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
				/* 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);
1190
1191
			gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
				__func__, skb_queue_len(&bcs->squeue));
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
			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)
{
1211
1212
1213
	struct bc_state *bcs = (struct bc_state *) data;
	struct bas_bc_state *ubc = bcs->hw.bas;
	struct cardstate *cs = bcs->cs;
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
	struct urb *urb;
	char *rcvbuf;
	unsigned long flags;
	int totleft, numbytes, offset, frame, rc;

	/* loop while more completed URBs arrive in the meantime */
	for (;;) {
		/* 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)) {
1229
1230
1231
1232
1233
			dev_warn(cs->dev,
				 "isochronous read overrun, "
				 "dropped URB with status: %s, %d bytes lost\n",
				 get_usb_statmsg(ubc->loststatus),
				 ubc->isoinlost);
1234
1235
1236
1237
1238
			ubc->loststatus = -EINPROGRESS;
		}
		spin_unlock_irqrestore(&ubc->isoinlock, flags);

		if (unlikely(!(atomic_read(&ubc->running)))) {
1239
1240
1241
1242
			gig_dbg(DEBUG_ISO,
				"%s: channel not running, "
				"dropped URB with status: %s",
				__func__, get_usb_statmsg(urb->status));
1243
1244
1245
1246
1247
1248
			return;
		}

		switch (urb->status) {
		case 0:				/* normal completion */
			break;
1249
1250
		case -EXDEV:			/* inspect individual frames
						   (we do that anyway) */
1251
1252
			gig_dbg(DEBUG_ISO, "%s: URB partially completed",
				__func__);
1253
1254
1255
			break;
		case -ENOENT:
		case -ECONNRESET:
1256
1257
1258
		case -EINPROGRESS:
			gig_dbg(DEBUG_ISO, "%s: %s",
				__func__, get_usb_statmsg(urb->status));
1259
1260
			continue;		/* -> skip */
		case -EPIPE:
1261
			dev_err(cs->dev, "isochronous read stalled\n");
1262
1263
1264
			error_hangup(bcs);
			continue;		/* -> skip */
		default:			/* severe trouble */
1265
1266
			dev_warn(cs->dev, "isochronous read: %s\n",
				 get_usb_statmsg(urb->status));
1267
1268
1269
1270
1271
1272
1273
			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)) {
1274
1275
1276
1277
1278
				dev_warn(cs->dev,
					 "isochronous read: frame %d: %s\n",
					 frame,
					 get_usb_statmsg(
					    urb->iso_frame_desc[frame].status));
1279
1280
1281
1282
				break;
			}
			numbytes = urb->iso_frame_desc[frame].actual_length;
			if (unlikely(numbytes > BAS_MAXFRAME)) {
1283
1284
1285
1286
				dev_warn(cs->dev,
					 "isochronous read: frame %d: "
					 "numbytes (%d) > BAS_MAXFRAME\n",
					 frame, numbytes);
1287
1288
1289
				break;
			}
			if (unlikely(numbytes > totleft)) {
1290
1291
1292
1293
				dev_warn(cs->dev,
					 "isochronous read: frame %d: "
					 "numbytes (%d) > totleft (%d)\n",
					 frame, numbytes, totleft);
1294
1295
1296
1297
				break;
			}
			offset = urb->iso_frame_desc[frame].offset;
			if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1298
1299
1300
1301
1302
				dev_warn(cs->dev,
					 "isochronous read: frame %d: "
					 "offset (%d) + numbytes (%d) "
					 "> BAS_INBUFSIZE\n",
					 frame, offset, numbytes);
1303
1304
1305
1306
1307
1308
				break;
			}
			gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
			totleft -= numbytes;
		}
		if (unlikely(totleft > 0))
1309
1310
1311
			dev_warn(cs->dev,
				 "isochronous read: %d data bytes missing\n",
				 totleft);
1312
1313
1314
1315
1316
1317
1318

	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;
		}
1319
1320
		/* urb->dev is clobbered by USB subsystem */
		urb->dev = bcs->cs->hw.bas->udev;
1321
1322
		urb->transfer_flags = URB_ISO_ASAP;
		urb->number_of_packets = BAS_NUMFRAMES;
1323
1324
		rc = usb_submit_urb(urb, SLAB_ATOMIC);
		if (unlikely(rc != 0 && rc != -ENODEV)) {
1325
1326
			dev_err(cs->dev,
				"could not resubmit isochronous read URB: %s\n",
1327
				get_usb_rcmsg(rc));
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
			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;
1345
	struct bas_cardstate *ucs = bcs->cs->hw.bas;
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
	int pending;
	unsigned long flags;

	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 */
1358
		gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1359
1360
1361
		break;

	case HD_OPEN_ATCHANNEL:
1362
		dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1363
1364
1365
1366
1367
		error_reset(bcs->cs);
		break;

	case HD_OPEN_B2CHANNEL:
	case HD_OPEN_B1CHANNEL:
1368
1369
		dev_err(bcs->cs->dev, "timeout opening channel %d\n",
			bcs->channel + 1);
1370
1371
1372
1373
		error_hangup(bcs);
		break;

	case HD_CLOSE_ATCHANNEL:
1374
		dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1375
1376
1377
1378
		break;

	case HD_CLOSE_B2CHANNEL:
	case HD_CLOSE_B1CHANNEL:
1379
1380
		dev_err(bcs->cs->dev, "timeout closing channel %d\n",
			bcs->channel + 1);
1381
1382
1383
		break;

	default:
1384
1385
		dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
			 pending);
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
	}
}

/* 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)
{
1398
	struct bas_cardstate *ucs = urb->context;
1399
1400
1401
1402
	unsigned long flags;

	spin_lock_irqsave(&ucs->lock, flags);
	if (urb->status && ucs->pending) {
1403
1404
1405
		dev_err(&ucs->interface->dev,
			"control request 0x%02x failed: %s\n",
			ucs->pending, get_usb_statmsg(urb->status));
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430