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,
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			   &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));
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		break;

	case HD_RECEIVEATDATA_ACK:	/* AT response ready to be received */
		if (!l) {
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			dev_warn(cs->dev,
				"HD_RECEIVEATDATA_ACK with length 0 ignored\n");
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			break;
		}
		spin_lock_irqsave(&cs->lock, flags);
		if (ucs->rcvbuf_size) {
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			/* throw away previous buffer - we have no queue */
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			dev_err(cs->dev,
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				"receive AT data overrun, %d bytes lost\n",
				ucs->rcvbuf_size);
			kfree(ucs->rcvbuf);
			ucs->rcvbuf_size = 0;
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		}
		if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
			spin_unlock_irqrestore(&cs->lock, flags);
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			dev_err(cs->dev, "out of memory receiving AT data\n");
			error_reset(cs);
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			break;
		}
		ucs->rcvbuf_size = l;
		ucs->retry_cmd_in = 0;
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		if ((rc = atread_submit(cs, BAS_TIMEOUT)) < 0) {
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			kfree(ucs->rcvbuf);
			ucs->rcvbuf = NULL;
			ucs->rcvbuf_size = 0;
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			if (rc != -ENODEV)
				//FIXME corrective action?
				error_reset(cs);
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		}
		spin_unlock_irqrestore(&cs->lock, flags);
		break;

	case HD_RESET_INTERRUPT_PIPE_ACK:
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		gig_dbg(DEBUG_USBREQ, "HD_RESET_INTERRUPT_PIPE_ACK");
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		break;

	case HD_SUSPEND_END:
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		gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
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		break;

	default:
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		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)
{
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	struct bc_state *bcs = (struct bc_state *) data;
	struct bas_bc_state *ubc = bcs->hw.bas;
	struct cardstate *cs = bcs->cs;
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	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)) {
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			dev_warn(cs->dev,
				 "isochronous read overrun, "
				 "dropped URB with status: %s, %d bytes lost\n",
				 get_usb_statmsg(ubc->loststatus),
				 ubc->isoinlost);
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			ubc->loststatus = -EINPROGRESS;
		}
		spin_unlock_irqrestore(&ubc->isoinlock, flags);

		if (unlikely(!(atomic_read(&ubc->running)))) {
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			gig_dbg(DEBUG_ISO,
				"%s: channel not running, "
				"dropped URB with status: %s",
				__func__, get_usb_statmsg(urb->status));
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			return;
		}

		switch (urb->status) {
		case 0:				/* normal completion */
			break;