linux/drivers/isdn/hisax/st5481_b.c
Karsten Keil c38fc3bc2e ISDN: Add support for none reverse bitstreams to isdnhdc
The original isdnhdlc code was developed for devices which had
reversed bitorder in the byte stream. Adding code to handle normal
bitstreams as well.

Signed-off-by: Karsten Keil <keil@b1-systems.de>
2009-07-25 20:16:01 +02:00

381 lines
9.7 KiB
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/usb.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/bitrev.h>
#include "st5481.h"
static inline void B_L1L2(struct st5481_bcs *bcs, int pr, void *arg)
{
struct hisax_if *ifc = (struct hisax_if *) &bcs->b_if;
ifc->l1l2(ifc, pr, arg);
}
/*
* Encode and transmit next frame.
*/
static void usb_b_out(struct st5481_bcs *bcs,int buf_nr)
{
struct st5481_b_out *b_out = &bcs->b_out;
struct st5481_adapter *adapter = bcs->adapter;
struct urb *urb;
unsigned int packet_size,offset;
int len,buf_size,bytes_sent;
int i;
struct sk_buff *skb;
if (test_and_set_bit(buf_nr, &b_out->busy)) {
DBG(4,"ep %d urb %d busy",(bcs->channel+1)*2,buf_nr);
return;
}
urb = b_out->urb[buf_nr];
// Adjust isoc buffer size according to flow state
if(b_out->flow_event & (OUT_DOWN | OUT_UNDERRUN)) {
buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST;
packet_size = SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST;
DBG(4,"B%d,adjust flow,add %d bytes",bcs->channel+1,B_FLOW_ADJUST);
} else if(b_out->flow_event & OUT_UP){
buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT - B_FLOW_ADJUST;
packet_size = SIZE_ISO_PACKETS_B_OUT - B_FLOW_ADJUST;
DBG(4,"B%d,adjust flow,remove %d bytes",bcs->channel+1,B_FLOW_ADJUST);
} else {
buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT;
packet_size = 8;
}
b_out->flow_event = 0;
len = 0;
while (len < buf_size) {
if ((skb = b_out->tx_skb)) {
DBG_SKB(0x100, skb);
DBG(4,"B%d,len=%d",bcs->channel+1,skb->len);
if (bcs->mode == L1_MODE_TRANS) {
bytes_sent = buf_size - len;
if (skb->len < bytes_sent)
bytes_sent = skb->len;
{ /* swap tx bytes to get hearable audio data */
register unsigned char *src = skb->data;
register unsigned char *dest = urb->transfer_buffer+len;
register unsigned int count;
for (count = 0; count < bytes_sent; count++)
*dest++ = bitrev8(*src++);
}
len += bytes_sent;
} else {
len += isdnhdlc_encode(&b_out->hdlc_state,
skb->data, skb->len, &bytes_sent,
urb->transfer_buffer+len, buf_size-len);
}
skb_pull(skb, bytes_sent);
if (!skb->len) {
// Frame sent
b_out->tx_skb = NULL;
B_L1L2(bcs, PH_DATA | CONFIRM, (void *)(unsigned long) skb->truesize);
dev_kfree_skb_any(skb);
/* if (!(bcs->tx_skb = skb_dequeue(&bcs->sq))) { */
/* st5481B_sched_event(bcs, B_XMTBUFREADY); */
/* } */
}
} else {
if (bcs->mode == L1_MODE_TRANS) {
memset(urb->transfer_buffer+len, 0xff, buf_size-len);
len = buf_size;
} else {
// Send flags
len += isdnhdlc_encode(&b_out->hdlc_state,
NULL, 0, &bytes_sent,
urb->transfer_buffer+len, buf_size-len);
}
}
}
// Prepare the URB
for (i = 0, offset = 0; offset < len; i++) {
urb->iso_frame_desc[i].offset = offset;
urb->iso_frame_desc[i].length = packet_size;
offset += packet_size;
packet_size = SIZE_ISO_PACKETS_B_OUT;
}
urb->transfer_buffer_length = len;
urb->number_of_packets = i;
urb->dev = adapter->usb_dev;
DBG_ISO_PACKET(0x200,urb);
SUBMIT_URB(urb, GFP_NOIO);
}
/*
* Start transfering (flags or data) on the B channel, since
* FIFO counters has been set to a non-zero value.
*/
static void st5481B_start_xfer(void *context)
{
struct st5481_bcs *bcs = context;
DBG(4,"B%d",bcs->channel+1);
// Start transmitting (flags or data) on B channel
usb_b_out(bcs,0);
usb_b_out(bcs,1);
}
/*
* If the adapter has only 2 LEDs, the green
* LED will blink with a rate depending
* on the number of channels opened.
*/
static void led_blink(struct st5481_adapter *adapter)
{
u_char leds = adapter->leds;
// 50 frames/sec for each channel
if (++adapter->led_counter % 50) {
return;
}
if (adapter->led_counter % 100) {
leds |= GREEN_LED;
} else {
leds &= ~GREEN_LED;
}
st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, leds, NULL, NULL);
}
static void usb_b_out_complete(struct urb *urb)
{
struct st5481_bcs *bcs = urb->context;
struct st5481_b_out *b_out = &bcs->b_out;
struct st5481_adapter *adapter = bcs->adapter;
int buf_nr;
buf_nr = get_buf_nr(b_out->urb, urb);
test_and_clear_bit(buf_nr, &b_out->busy);
if (unlikely(urb->status < 0)) {
switch (urb->status) {
case -ENOENT:
case -ESHUTDOWN:
case -ECONNRESET:
DBG(4,"urb killed status %d", urb->status);
return; // Give up
default:
WARNING("urb status %d",urb->status);
if (b_out->busy == 0) {
st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2 | USB_DIR_OUT, NULL, NULL);
}
break;
}
}
usb_b_out(bcs,buf_nr);
if (adapter->number_of_leds == 2)
led_blink(adapter);
}
/*
* Start or stop the transfer on the B channel.
*/
static void st5481B_mode(struct st5481_bcs *bcs, int mode)
{
struct st5481_b_out *b_out = &bcs->b_out;
struct st5481_adapter *adapter = bcs->adapter;
DBG(4,"B%d,mode=%d", bcs->channel + 1, mode);
if (bcs->mode == mode)
return;
bcs->mode = mode;
// Cancel all USB transfers on this B channel
usb_unlink_urb(b_out->urb[0]);
usb_unlink_urb(b_out->urb[1]);
b_out->busy = 0;
st5481_in_mode(&bcs->b_in, mode);
if (bcs->mode != L1_MODE_NULL) {
// Open the B channel
if (bcs->mode != L1_MODE_TRANS) {
u32 features = HDLC_BITREVERSE;
if (bcs->mode == L1_MODE_HDLC_56K)
features |= HDLC_56KBIT;
isdnhdlc_out_init(&b_out->hdlc_state, features);
}
st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2, NULL, NULL);
// Enable B channel interrupts
st5481_usb_device_ctrl_msg(adapter, FFMSK_B1+(bcs->channel*2),
OUT_UP+OUT_DOWN+OUT_UNDERRUN, NULL, NULL);
// Enable B channel FIFOs
st5481_usb_device_ctrl_msg(adapter, OUT_B1_COUNTER+(bcs->channel*2), 32, st5481B_start_xfer, bcs);
if (adapter->number_of_leds == 4) {
if (bcs->channel == 0) {
adapter->leds |= B1_LED;
} else {
adapter->leds |= B2_LED;
}
}
} else {
// Disble B channel interrupts
st5481_usb_device_ctrl_msg(adapter, FFMSK_B1+(bcs->channel*2), 0, NULL, NULL);
// Disable B channel FIFOs
st5481_usb_device_ctrl_msg(adapter, OUT_B1_COUNTER+(bcs->channel*2), 0, NULL, NULL);
if (adapter->number_of_leds == 4) {
if (bcs->channel == 0) {
adapter->leds &= ~B1_LED;
} else {
adapter->leds &= ~B2_LED;
}
} else {
st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL);
}
if (b_out->tx_skb) {
dev_kfree_skb_any(b_out->tx_skb);
b_out->tx_skb = NULL;
}
}
}
static int st5481_setup_b_out(struct st5481_bcs *bcs)
{
struct usb_device *dev = bcs->adapter->usb_dev;
struct usb_interface *intf;
struct usb_host_interface *altsetting = NULL;
struct usb_host_endpoint *endpoint;
struct st5481_b_out *b_out = &bcs->b_out;
DBG(4,"");
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 B channel out
endpoint = &altsetting->endpoint[EP_B1_OUT - 1 + bcs->channel * 2];
DBG(4,"endpoint address=%02x,packet size=%d",
endpoint->desc.bEndpointAddress, le16_to_cpu(endpoint->desc.wMaxPacketSize));
// Allocate memory for 8000bytes/sec + extra bytes if underrun
return st5481_setup_isocpipes(b_out->urb, dev,
usb_sndisocpipe(dev, endpoint->desc.bEndpointAddress),
NUM_ISO_PACKETS_B, SIZE_ISO_PACKETS_B_OUT,
NUM_ISO_PACKETS_B * SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST,
usb_b_out_complete, bcs);
}
static void st5481_release_b_out(struct st5481_bcs *bcs)
{
struct st5481_b_out *b_out = &bcs->b_out;
DBG(4,"");
st5481_release_isocpipes(b_out->urb);
}
int st5481_setup_b(struct st5481_bcs *bcs)
{
int retval;
DBG(4,"");
retval = st5481_setup_b_out(bcs);
if (retval)
goto err;
bcs->b_in.bufsize = HSCX_BUFMAX;
bcs->b_in.num_packets = NUM_ISO_PACKETS_B;
bcs->b_in.packet_size = SIZE_ISO_PACKETS_B_IN;
bcs->b_in.ep = (bcs->channel ? EP_B2_IN : EP_B1_IN) | USB_DIR_IN;
bcs->b_in.counter = bcs->channel ? IN_B2_COUNTER : IN_B1_COUNTER;
bcs->b_in.adapter = bcs->adapter;
bcs->b_in.hisax_if = &bcs->b_if.ifc;
retval = st5481_setup_in(&bcs->b_in);
if (retval)
goto err_b_out;
return 0;
err_b_out:
st5481_release_b_out(bcs);
err:
return retval;
}
/*
* Release buffers and URBs for the B channels
*/
void st5481_release_b(struct st5481_bcs *bcs)
{
DBG(4,"");
st5481_release_in(&bcs->b_in);
st5481_release_b_out(bcs);
}
/*
* st5481_b_l2l1 is the entry point for upper layer routines that want to
* transmit on the B channel. PH_DATA | REQUEST is a normal packet that
* we either start transmitting (if idle) or queue (if busy).
* PH_PULL | REQUEST can be called to request a callback message
* (PH_PULL | CONFIRM)
* once the link is idle. After a "pull" callback, the upper layer
* routines can use PH_PULL | INDICATION to send data.
*/
void st5481_b_l2l1(struct hisax_if *ifc, int pr, void *arg)
{
struct st5481_bcs *bcs = ifc->priv;
struct sk_buff *skb = arg;
long mode;
DBG(4, "");
switch (pr) {
case PH_DATA | REQUEST:
BUG_ON(bcs->b_out.tx_skb);
bcs->b_out.tx_skb = skb;
break;
case PH_ACTIVATE | REQUEST:
mode = (long) arg;
DBG(4,"B%d,PH_ACTIVATE_REQUEST %ld", bcs->channel + 1, mode);
st5481B_mode(bcs, mode);
B_L1L2(bcs, PH_ACTIVATE | INDICATION, NULL);
break;
case PH_DEACTIVATE | REQUEST:
DBG(4,"B%d,PH_DEACTIVATE_REQUEST", bcs->channel + 1);
st5481B_mode(bcs, L1_MODE_NULL);
B_L1L2(bcs, PH_DEACTIVATE | INDICATION, NULL);
break;
default:
WARNING("pr %#x\n", pr);
}
}