path: root/drivers/isdn/hisax/st5481_d.c

/*
 * Driver for ST5481 USB ISDN modem
 *
 * Author       Frode Isaksen
 * Copyright    2001 by Frode Isaksen      <fisaksen@bewan.com>
 *              2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/usb.h>
#include <linux/netdevice.h>
#include "st5481.h"

static void ph_connect(struct st5481_adapter *adapter);
static void ph_disconnect(struct st5481_adapter *adapter);

static struct Fsm l1fsm;

static char *strL1State[] =
{
	"ST_L1_F3",
	"ST_L1_F4",
	"ST_L1_F6",
	"ST_L1_F7",
	"ST_L1_F8",
};

static char *strL1Event[] =
{
	"EV_IND_DP",
	"EV_IND_1",
	"EV_IND_2",
	"EV_IND_3",
	"EV_IND_RSY",
	"EV_IND_5",
	"EV_IND_6",
	"EV_IND_7",
	"EV_IND_AP",
	"EV_IND_9",
	"EV_IND_10",
	"EV_IND_11",
	"EV_IND_AI8",
	"EV_IND_AI10",
	"EV_IND_AIL",
	"EV_IND_DI",
	"EV_PH_ACTIVATE_REQ",
	"EV_PH_DEACTIVATE_REQ",
	"EV_TIMER3",
};

static inline void D_L1L2(struct st5481_adapter *adapter, int pr, void *arg)
{
	struct hisax_if *ifc = (struct hisax_if *) &adapter->hisax_d_if;

	ifc->l1l2(ifc, pr, arg);
}

static void
l1_go_f3(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	if (fi->state == ST_L1_F7)
		ph_disconnect(adapter);

	FsmChangeState(fi, ST_L1_F3);
	D_L1L2(adapter, PH_DEACTIVATE | INDICATION, NULL);
}

static void
l1_go_f6(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	if (fi->state == ST_L1_F7)
		ph_disconnect(adapter);

	FsmChangeState(fi, ST_L1_F6);
}

static void
l1_go_f7(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	FsmDelTimer(&adapter->timer, 0);
	ph_connect(adapter);
	FsmChangeState(fi, ST_L1_F7);
	D_L1L2(adapter, PH_ACTIVATE | INDICATION, NULL);
}

static void
l1_go_f8(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	if (fi->state == ST_L1_F7)
		ph_disconnect(adapter);

	FsmChangeState(fi, ST_L1_F8);
}

static void
l1_timer3(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	st5481_ph_command(adapter, ST5481_CMD_DR);
	FsmChangeState(fi, ST_L1_F3);
	D_L1L2(adapter, PH_DEACTIVATE | INDICATION, NULL);
}

static void
l1_ignore(struct FsmInst *fi, int event, void *arg)
{
}

static void
l1_activate(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	st5481_ph_command(adapter, ST5481_CMD_DR);
	st5481_ph_command(adapter, ST5481_CMD_PUP);
	FsmRestartTimer(&adapter->timer, TIMER3_VALUE, EV_TIMER3, NULL, 2);
	st5481_ph_command(adapter, ST5481_CMD_AR8);
	FsmChangeState(fi, ST_L1_F4);
}

static struct FsmNode L1FnList[] __initdata =
{
	{ST_L1_F3, EV_IND_DP,            l1_ignore},
	{ST_L1_F3, EV_IND_AP,            l1_go_f6},
	{ST_L1_F3, EV_IND_AI8,           l1_go_f7},
	{ST_L1_F3, EV_IND_AI10,          l1_go_f7},
	{ST_L1_F3, EV_PH_ACTIVATE_REQ,   l1_activate},

	{ST_L1_F4, EV_TIMER3,            l1_timer3},
	{ST_L1_F4, EV_IND_DP,            l1_go_f3},
	{ST_L1_F4, EV_IND_AP,            l1_go_f6},
	{ST_L1_F4, EV_IND_AI8,           l1_go_f7},
	{ST_L1_F4, EV_IND_AI10,          l1_go_f7},

	{ST_L1_F6, EV_TIMER3,            l1_timer3},
	{ST_L1_F6, EV_IND_DP,            l1_go_f3},
	{ST_L1_F6, EV_IND_AP,            l1_ignore},
	{ST_L1_F6, EV_IND_AI8,           l1_go_f7},
	{ST_L1_F6, EV_IND_AI10,          l1_go_f7},
	{ST_L1_F7, EV_IND_RSY,           l1_go_f8},

	{ST_L1_F7, EV_IND_DP,            l1_go_f3},
	{ST_L1_F7, EV_IND_AP,            l1_go_f6},
	{ST_L1_F7, EV_IND_AI8,           l1_ignore},
	{ST_L1_F7, EV_IND_AI10,          l1_ignore},
	{ST_L1_F7, EV_IND_RSY,           l1_go_f8},

	{ST_L1_F8, EV_TIMER3,            l1_timer3},
	{ST_L1_F8, EV_IND_DP,            l1_go_f3},
	{ST_L1_F8, EV_IND_AP,            l1_go_f6},
	{ST_L1_F8, EV_IND_AI8,           l1_go_f8},
	{ST_L1_F8, EV_IND_AI10,          l1_go_f8},
	{ST_L1_F8, EV_IND_RSY,           l1_ignore},
};

static __printf(2, 3)
	void l1m_debug(struct FsmInst *fi, char *fmt, ...)
{
	va_list args;
	char buf[256];

	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	DBG(8, "%s", buf);
	va_end(args);
}

/* ======================================================================
 * D-Channel out
 */

/*
  D OUT state machine:
  ====================

  Transmit short frame (< 16 bytes of encoded data):

  L1 FRAME    D_OUT_STATE           USB                  D CHANNEL
  --------    -----------           ---                  ---------

  FIXME

  -> [xx..xx]  SHORT_INIT            -> [7Exx..xxC1C27EFF]
  SHORT_WAIT_DEN        <> OUT_D_COUNTER=16

  END_OF_SHORT          <- DEN_EVENT         -> 7Exx
  xxxx
  xxxx
  xxxx
  xxxx
  xxxx
  C1C1
  7EFF
  WAIT_FOR_RESET_IDLE   <- D_UNDERRUN        <- (8ms)
  IDLE                  <> Reset pipe



  Transmit long frame (>= 16 bytes of encoded data):

  L1 FRAME    D_OUT_STATE           USB                  D CHANNEL
  --------    -----------           ---                  ---------

  -> [xx...xx] IDLE
  WAIT_FOR_STOP         <> OUT_D_COUNTER=0
  WAIT_FOR_RESET        <> Reset pipe
  STOP
  INIT_LONG_FRAME       -> [7Exx..xx]
  WAIT_DEN              <> OUT_D_COUNTER=16
  OUT_NORMAL            <- DEN_EVENT       -> 7Exx
  END_OF_FRAME_BUSY     -> [xxxx]             xxxx
  END_OF_FRAME_NOT_BUSY -> [xxxx]             xxxx
  -> [xxxx]		  xxxx
  -> [C1C2]		  xxxx
  -> [7EFF]		  xxxx
  xxxx
  xxxx
  ....
  xxxx
  C1C2
  7EFF
  <- D_UNDERRUN      <- (> 8ms)
  WAIT_FOR_STOP         <> OUT_D_COUNTER=0
  WAIT_FOR_RESET        <> Reset pipe
  STOP

*/

static struct Fsm dout_fsm;

static char *strDoutState[] =
{
	"ST_DOUT_NONE",

	"ST_DOUT_SHORT_INIT",
	"ST_DOUT_SHORT_WAIT_DEN",

	"ST_DOUT_LONG_INIT",
	"ST_DOUT_LONG_WAIT_DEN",
	"ST_DOUT_NORMAL",

	"ST_DOUT_WAIT_FOR_UNDERRUN",
	"ST_DOUT_WAIT_FOR_NOT_BUSY",
	"ST_DOUT_WAIT_FOR_STOP",
	"ST_DOUT_WAIT_FOR_RESET",
};

static char *strDoutEvent[] =
{
	"EV_DOUT_START_XMIT",
	"EV_DOUT_COMPLETE",
	"EV_DOUT_DEN",
	"EV_DOUT_RESETED",
	"EV_DOUT_STOPPED",
	"EV_DOUT_COLL",
	"EV_DOUT_UNDERRUN",
};

static __printf(2, 3)
	void dout_debug(struct FsmInst *fi, char *fmt, ...)
{
	va_list args;
	char buf[256];

	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	DBG(0x2, "%s", buf);
	va_end(args);
}

static void dout_stop_event(void *context)
{
	struct st5481_adapter *adapter = context;

	FsmEvent(&adapter->d_out.fsm, EV_DOUT_STOPPED, NULL);
}

/*
 * Start the transfer of a D channel frame.
 */
static void usb_d_out(struct st5481_adapter *adapter, int buf_nr)
{
	struct st5481_d_out *d_out = &adapter->d_out;
	struct urb *urb;
	unsigned int num_packets, packet_offset;
	int len, buf_size, bytes_sent;
	struct sk_buff *skb;
	struct usb_iso_packet_descriptor *desc;

	if (d_out->fsm.state != ST_DOUT_NORMAL)
		return;

	if (test_and_set_bit(buf_nr, &d_out->busy)) {
		DBG(2, "ep %d urb %d busy %#lx", EP_D_OUT, buf_nr, d_out->busy);
		return;
	}
	urb = d_out->urb[buf_nr];

	skb = d_out->tx_skb;

	buf_size = NUM_ISO_PACKETS_D * SIZE_ISO_PACKETS_D_OUT;

	if (skb) {
		len = isdnhdlc_encode(&d_out->hdlc_state,
				      skb->data, skb->len, &bytes_sent,
				      urb->transfer_buffer, buf_size);
		skb_pull(skb, bytes_sent);
	} else {
		// Send flags or idle
		len = isdnhdlc_encode(&d_out->hdlc_state,
				      NULL, 0, &bytes_sent,
				      urb->transfer_buffer, buf_size);
	}

	if (len < buf_size) {
		FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_UNDERRUN);
	}
	if (skb && !skb->len) {
		d_out->tx_skb = NULL;
		D_L1L2(adapter, PH_DATA | CONFIRM, NULL);
		dev_kfree_skb_any(skb);
	}

	// Prepare the URB
	urb->transfer_buffer_length = len;
	num_packets = 0;
	packet_offset = 0;
	while (packet_offset < len) {
		desc = &urb->iso_frame_desc[num_packets];
		desc->offset = packet_offset;
		desc->length = SIZE_ISO_PACKETS_D_OUT;
		if (len - packet_offset < desc->length)
			desc->length = len - packet_offset;
		num_packets++;
		packet_offset += desc->length;
	}
	urb->number_of_packets = num_packets;

	// Prepare the URB
	urb->dev = adapter->usb_dev;
	// Need to transmit the next buffer 2ms after the DEN_EVENT
	urb->transfer_flags = 0;
	urb->start_frame = usb_get_current_frame_number(adapter->usb_dev) + 2;

	DBG_ISO_PACKET(0x20, urb);

	if (usb_submit_urb(urb, GFP_KERNEL) < 0) {
		// There is another URB queued up
		urb->transfer_flags = URB_ISO_ASAP;
		SUBMIT_URB(urb, GFP_KERNEL);
	}
}

static void fifo_reseted(void *context)
{
	struct st5481_adapter *adapter = context;

	FsmEvent(&adapter->d_out.fsm, EV_DOUT_RESETED, NULL);
}

static void usb_d_out_complete(struct urb *urb)
{
	struct st5481_adapter *adapter = urb->context;
	struct st5481_d_out *d_out = &adapter->d_out;
	long buf_nr;

	DBG(2, "");

	buf_nr = get_buf_nr(d_out->urb, urb);
	test_and_clear_bit(buf_nr, &d_out->busy);

	if (unlikely(urb->status < 0)) {
		switch (urb->status) {
		case -ENOENT:
		case -ESHUTDOWN:
		case -ECONNRESET:
			DBG(1, "urb killed status %d", urb->status);
			break;
		default:
			WARNING("urb status %d", urb->status);
			if (d_out->busy == 0) {
				st5481_usb_pipe_reset(adapter, EP_D_OUT | USB_DIR_OUT, fifo_reseted, adapter);
			}
			break;
		}
		return; // Give up
	}

	FsmEvent(&adapter->d_out.fsm, EV_DOUT_COMPLETE, (void *) buf_nr);
}

/* ====================================================================== */

static void dout_start_xmit(struct FsmInst *fsm, int event, void *arg)
{
	// FIXME unify?
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;
	struct urb *urb;
	int len, bytes_sent;
	struct sk_buff *skb;
	int buf_nr = 0;

	skb = d_out->tx_skb;

	DBG(2, "len=%d", skb->len);

	isdnhdlc_out_init(&d_out->hdlc_state, HDLC_DCHANNEL | HDLC_BITREVERSE);

	if (test_and_set_bit(buf_nr, &d_out->busy)) {
		WARNING("ep %d urb %d busy %#lx", EP_D_OUT, buf_nr, d_out->busy);
		return;
	}
	urb = d_out->urb[buf_nr];

	DBG_SKB(0x10, skb);
	len = isdnhdlc_encode(&d_out->hdlc_state,
			      skb->data, skb->len, &bytes_sent,
			      urb->transfer_buffer, 16);
	skb_pull(skb, bytes_sent);

	if (len < 16)
		FsmChangeState(&d_out->fsm, ST_DOUT_SHORT_INIT);
	else
		FsmChangeState(&d_out->fsm, ST_DOUT_LONG_INIT);

	if (skb->len == 0) {
		d_out->tx_skb = NULL;
		D_L1L2(adapter, PH_DATA | CONFIRM, NULL);
		dev_kfree_skb_any(skb);
	}

// Prepare the URB
	urb->transfer_buffer_length = len;

	urb->iso_frame_desc[0].offset = 0;
	urb->iso_frame_desc[0].length = len;
	urb->number_of_packets = 1;

	// Prepare the URB
	urb->dev = adapter->usb_dev;
	urb->transfer_flags = URB_ISO_ASAP;

	DBG_ISO_PACKET(0x20, urb);
	SUBMIT_URB(urb, GFP_KERNEL);
}

static void dout_short_fifo(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_SHORT_WAIT_DEN);
	st5481_usb_device_ctrl_msg(adapter, OUT_D_COUNTER, 16, NULL, NULL);
}

static void dout_end_short_frame(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_UNDERRUN);
}

static void dout_long_enable_fifo(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	st5481_usb_device_ctrl_msg(adapter, OUT_D_COUNTER, 16, NULL, NULL);
	FsmChangeState(&d_out->fsm, ST_DOUT_LONG_WAIT_DEN);
}

static void dout_long_den(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_NORMAL);
	usb_d_out(adapter, 0);
	usb_d_out(adapter, 1);
}

static void dout_reset(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_RESET);
	st5481_usb_pipe_reset(adapter, EP_D_OUT | USB_DIR_OUT, fifo_reseted, adapter);
}

static void dout_stop(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_STOP);
	st5481_usb_device_ctrl_msg(adapter, OUT_D_COUNTER, 0, dout_stop_event, adapter);
}

static void dout_underrun(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	if (test_bit(0, &d_out->busy) || test_bit(1, &d_out->busy)) {
		FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_NOT_BUSY);
	}  else {
		dout_stop(fsm, event, arg);
	}
}

static void dout_check_busy(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	if (!test_bit(0, &d_out->busy) && !test_bit(1, &d_out->busy))
		dout_stop(fsm, event, arg);
}

static void dout_reseted(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_NONE);
	// FIXME locking
	if (d_out->tx_skb)
		FsmEvent(&d_out->fsm, EV_DOUT_START_XMIT, NULL);
}

static void dout_complete(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	long buf_nr = (long) arg;

	usb_d_out(adapter, buf_nr);
}

static void dout_ignore(struct FsmInst *fsm, int event, void *arg)
{
}

static struct FsmNode DoutFnList[] __initdata =
{
	{ST_DOUT_NONE,                   EV_DOUT_START_XMIT,   dout_start_xmit},

	{ST_DOUT_SHORT_INIT,             EV_DOUT_COMPLETE,     dout_short_fifo},

	{ST_DOUT_SHORT_WAIT_DEN,         EV_DOUT_DEN,          dout_end_short_frame},
	{ST_DOUT_SHORT_WAIT_DEN,         EV_DOUT_UNDERRUN,     dout_underrun},

	{ST_DOUT_LONG_INIT,              EV_DOUT_COMPLETE,     dout_long_enable_fifo},

	{ST_DOUT_LONG_WAIT_DEN,          EV_DOUT_DEN,          dout_long_den},
	{ST_DOUT_LONG_WAIT_DEN,          EV_DOUT_UNDERRUN,     dout_underrun},

	{ST_DOUT_NORMAL,                 EV_DOUT_UNDERRUN,     dout_underrun},
	{ST_DOUT_NORMAL,                 EV_DOUT_COMPLETE,     dout_complete},

	{ST_DOUT_WAIT_FOR_UNDERRUN,      EV_DOUT_UNDERRUN,     dout_underrun},
	{ST_DOUT_WAIT_FOR_UNDERRUN,      EV_DOUT_COMPLETE,     dout_ignore},

	{ST_DOUT_WAIT_FOR_NOT_BUSY,      EV_DOUT_COMPLETE,     dout_check_busy},

	{ST_DOUT_WAIT_FOR_STOP,          EV_DOUT_STOPPED,      dout_reset},

	{ST_DOUT_WAIT_FOR_RESET,         EV_DOUT_RESETED,      dout_reseted},
};

void st5481_d_l2l1(struct hisax_if *hisax_d_if, int pr, void *arg)
{
	struct st5481_adapter *adapter = hisax_d_if->priv;
	struct sk_buff *skb = arg;

	switch (pr) {
	case PH_ACTIVATE | REQUEST:
		FsmEvent(&adapter->l1m, EV_PH_ACTIVATE_REQ, NULL);
		break;
	case PH_DEACTIVATE | REQUEST:
		FsmEvent(&adapter->l1m, EV_PH_DEACTIVATE_REQ, NULL);
		break;
	case PH_DATA | REQUEST:
		DBG(2, "PH_DATA REQUEST len %d", skb->len);
		BUG_ON(adapter->d_out.tx_skb);
		adapter->d_out.tx_skb = skb;
		FsmEvent(&adapter->d_out.fsm, EV_DOUT_START_XMIT, NULL);
		break;
	default:
		WARNING("pr %#x\n", pr);
		break;
	}
}

/* ======================================================================
 */

/*
 * Start receiving on the D channel since entered state F7.
 */
static void ph_connect(struct st5481_adapter *adapter)
{
	struct st5481_d_out *d_out = &adapter->d_out;
	struct st5481_in *d_in = &adapter->d_in;

	DBG(8, "");

	FsmChangeState(&d_out->fsm, ST_DOUT_NONE);

	//	st5481_usb_device_ctrl_msg(adapter, FFMSK_D, OUT_UNDERRUN, NULL, NULL);
	st5481_usb_device_ctrl_msg(adapter, FFMSK_D, 0xfc, NULL, NULL);
	st5481_in_mode(d_in, L1_MODE_HDLC);

#ifdef LOOPBACK
	// Turn loopback on (data sent on B and D looped back)
	st5481_usb_device_ctrl_msg(cs, LBB, 0x04, NULL, NULL);
#endif

	st5481_usb_pipe_reset(adapter, EP_D_OUT | USB_DIR_OUT, NULL, NULL);

	// Turn on the green LED to tell that we are in state F7
	adapter->leds |= GREEN_LED;
	st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL);
}

/*
 * Stop receiving on the D channel since not in state F7.
 */
static void ph_disconnect(struct st5481_adapter *adapter)
{
	DBG(8, "");

	st5481_in_mode(&adapter->d_in, L1_MODE_NULL);

	// Turn off the green LED to tell that we left state F7
	adapter->leds &= ~GREEN_LED;
	st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL);
}

static int st5481_setup_d_out(struct st5481_adapter *adapter)
{
	struct usb_device *dev = adapter->usb_dev;
	struct usb_interface *intf;
	struct usb_host_interface *altsetting = NULL;
	struct usb_host_endpoint *endpoint;
	struct st5481_d_out *d_out = &adapter->d_out;

	DBG(2, "");

	intf = usb_ifnum_to_if(dev, 0);
	if (intf)
		altsetting = usb_altnum_to_altsetting(intf, 3);
	if (!altsetting)
		return -ENXIO;

	// Allocate URBs and buffers for the D channel out
	endpoint = &altsetting->endpoint[EP_D_OUT-1];

	DBG(2, "endpoint address=%02x,packet size=%d",
	    endpoint->desc.bEndpointAddress, le16_to_cpu(endpoint->desc.wMaxPacketSize));

	return st5481_setup_isocpipes(d_out->urb, dev,
				      usb_sndisocpipe(dev, endpoint->desc.bEndpointAddress),
				      NUM_ISO_PACKETS_D, SIZE_ISO_PACKETS_D_OUT,
				      NUM_ISO_PACKETS_D * SIZE_ISO_PACKETS_D_OUT,
				      usb_d_out_complete, adapter);
}

static void st5481_release_d_out(struct st5481_adapter *adapter)
{
	struct st5481_d_out *d_out = &adapter->d_out;

	DBG(2, "");

	st5481_release_isocpipes(d_out->urb);
}

int st5481_setup_d(struct st5481_adapter *adapter)
{
	int retval;

	DBG(2, "");

	retval = st5481_setup_d_out(adapter);
	if (retval)
		goto err;
	adapter->d_in.bufsize = MAX_DFRAME_LEN_L1;
	adapter->d_in.num_packets = NUM_ISO_PACKETS_D;
	adapter->d_in.packet_size = SIZE_ISO_PACKETS_D_IN;
	adapter->d_in.ep = EP_D_IN | USB_DIR_IN;
	adapter->d_in.counter = IN_D_COUNTER;
	adapter->d_in.adapter = adapter;
	adapter->d_in.hisax_if = &adapter->hisax_d_if.ifc;
	retval = st5481_setup_in(&adapter->d_in);
	if (retval)
		goto err_d_out;

	adapter->l1m.fsm = &l1fsm;
	adapter->l1m.state = ST_L1_F3;
	adapter->l1m.debug = st5481_debug & 0x100;
	adapter->l1m.userdata = adapter;
	adapter->l1m.printdebug = l1m_debug;
	FsmInitTimer(&adapter->l1m, &adapter->timer);

	adapter->d_out.fsm.fsm = &dout_fsm;
	adapter->d_out.fsm.state = ST_DOUT_NONE;
	adapter->d_out.fsm.debug = st5481_debug & 0x100;
	adapter->d_out.fsm.userdata = adapter;
	adapter->d_out.fsm.printdebug = dout_debug;

	return 0;

err_d_out:
	st5481_release_d_out(adapter);
err:
	return retval;
}

void st5481_release_d(struct st5481_adapter *adapter)
{
	DBG(2, "");

	st5481_release_in(&adapter->d_in);
	st5481_release_d_out(adapter);
}

/* ======================================================================
 * init / exit
 */

int __init st5481_d_init(void)
{
	int retval;

	l1fsm.state_count = L1_STATE_COUNT;
	l1fsm.event_count = L1_EVENT_COUNT;
	l1fsm.strEvent = strL1Event;
	l1fsm.strState = strL1State;
	retval = FsmNew(&l1fsm, L1FnList, ARRAY_SIZE(L1FnList));
	if (retval)
		goto err;

	dout_fsm.state_count = DOUT_STATE_COUNT;
	dout_fsm.event_count = DOUT_EVENT_COUNT;
	dout_fsm.strEvent = strDoutEvent;
	dout_fsm.strState = strDoutState;
	retval = FsmNew(&dout_fsm, DoutFnList, ARRAY_SIZE(DoutFnList));
	if (retval)
		goto err_l1;

	return 0;

err_l1:
	FsmFree(&l1fsm);
err:
	return retval;
}

// can't be __exit
void st5481_d_exit(void)
{
	FsmFree(&l1fsm);
	FsmFree(&dout_fsm);
}