A simpler key

Just the same structure from my previous post with all the optional components removed.

struct zt_span {
spinlock_t lock;
void *pvt; /* Private stuff */
char name[40]; /* Span name */
char desc[80]; /* Span description */
const char *spantype; /* span type in text form */
const char *manufacturer; /* span's device manufacturer */
char devicetype[80]; /* span's device type */
char location[40]; /* span device's location in system */
int deflaw; /* Default law (ZT_MULAW or ZT_ALAW) */
int alarms; /* Pending alarms on span */
int flags;
int irq; /* IRQ for this span's hardware */
int lbo; /* Span Line-Buildout */
int lineconfig; /* Span line configuration */
int linecompat; /* Span line compatibility */
int channels; /* Number of channels in span */
int txlevel; /* Tx level */
int rxlevel; /* Rx level */
int syncsrc; /* current sync src (gets copied here) */
unsigned int bpvcount; /* BPV counter */
unsigned int crc4count; /* CRC4 error counter */
unsigned int ebitcount; /* current E-bit error count */
unsigned int fascount; /* current FAS error count */

int maintstat; /* Maintenance state */
wait_queue_head_t maintq; /* Maintenance queue */
int mainttimer; /* Maintenance timer */

int irqmisses; /* Interrupt misses */

int timingslips; /* Clock slips */

struct zt_chan *chans; /* Member channel structures */

/* ==== Span Callback Operations ==== */
/* Req: Set the requested chunk size. This is the unit in which you must
report results for conferencing, etc */
int (*setchunksize)(struct zt_span *span, int chunksize);

/* ==== Channel Callback Operations ==== */

int (*echocan_with_params)(struct zt_chan *chan, struct zt_echocanparams *ecp, struct zt_echocanparam *p);

/* Okay, now we get to the signalling. You have several options: */

/* Option 1: If you're a T1 like interface, you can just provide a
rbsbits function and we'll assert robbed bits for you. Be sure to
set the ZT_FLAG_RBS in this case. */

/* Opt: If the span uses A/B bits, set them here */
int (*rbsbits)(struct zt_chan *chan, int bits);


/* Used by zaptel only -- no user servicable parts inside */
int spanno; /* Span number for zaptel */
int offset; /* Offset within a given card */
int lastalarms; /* Previous alarms */

#ifdef CONFIG_DEVFS_FS
devfs_handle_t dhandle; /* Directory name */
#endif
/* If the watchdog detects no received data, it will call the
watchdog routine */
int (*watchdog)(struct zt_span *span, int cause);
#ifdef CONFIG_ZAPTEL_WATCHDOG
int watchcounter;
int watchstate;
#endif
};