patch-2.4.10 linux/drivers/isdn/hisax/st5481_b.c

• Lines: 368
• Date: Sun Sep 9 10:45:43 2001
• Orig file: v2.4.9/linux/drivers/isdn/hisax/st5481_b.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.9/linux/drivers/isdn/hisax/st5481_b.c linux/drivers/isdn/hisax/st5481_b.c
@@ -0,0 +1,367 @@
+/*
+ * 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/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/usb.h>
+#include <linux/slab.h>
+#include <linux/netdevice.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;
+
+				memcpy(urb->transfer_buffer+len, skb->data, bytes_sent);
+				
+				len += bytes_sent;
+			} else {
+				len += hdlc_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 *) 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 += hdlc_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);
+}
+
+/*
+ * 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 (urb->status < 0) {
+		if (urb->status != USB_ST_URB_KILLED) {
+			WARN("urb status %d",urb->status);
+			if (b_out->busy == 0) {
+				st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2 | USB_DIR_OUT, NULL, NULL);
+			}
+		} else {
+			DBG(1,"urb killed"); 
+			return; // Give up
+		}
+	}
+
+	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) {
+			hdlc_out_init(&b_out->hdlc_state, 0, bcs->mode == L1_MODE_HDLC_56K);
+		}
+		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 __devinit st5481_setup_b_out(struct st5481_bcs *bcs)
+{
+	struct usb_device *dev = bcs->adapter->usb_dev;
+	struct usb_interface_descriptor *altsetting;
+	struct usb_endpoint_descriptor *endpoint;
+  	struct st5481_b_out *b_out = &bcs->b_out;
+
+	DBG(4,"");
+
+	altsetting = &(dev->config->interface[0].altsetting[3]);
+
+	// 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->bEndpointAddress,endpoint->wMaxPacketSize);
+
+	// Allocate memory for 8000bytes/sec + extra bytes if underrun
+	return st5481_setup_isocpipes(b_out->urb, dev, 
+				      usb_sndisocpipe(dev, endpoint->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 __devexit 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 __devinit 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 __devexit 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;
+	int mode;
+
+	DBG(4, "");
+
+	switch (pr) {
+	case PH_DATA | REQUEST:
+		if (bcs->b_out.tx_skb)
+			BUG();
+		
+		bcs->b_out.tx_skb = skb;
+		break;
+	case PH_ACTIVATE | REQUEST:
+		mode = (int) arg;
+		DBG(4,"B%d,PH_ACTIVATE_REQUEST %d", 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:
+		WARN("pr %#x\n", pr);
+	}
+}