--- /dev/null
+/*
+ * 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 <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 transferring (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);
+ }
+}
Code Review / kvmfornfv.git / blobdiff