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   1 /*
   2  * Driver for ST5481 USB ISDN modem
   3  *
   4  * Author       Frode Isaksen
   5  * Copyright    2001 by Frode Isaksen      <fisaksen@bewan.com>
   6  *              2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
   7  *
   8  * This software may be used and distributed according to the terms
   9  * of the GNU General Public License, incorporated herein by reference.
  10  *
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/gfp.h>
  15 #include <linux/usb.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/bitrev.h>
  18 #include "st5481.h"
  19
  20 static inline void B_L1L2(struct st5481_bcs *bcs, int pr, void *arg)
  21 {
  22         struct hisax_if *ifc = (struct hisax_if *) &bcs->b_if;
  23
  24         ifc->l1l2(ifc, pr, arg);
  25 }
  26
  27 /*
  28  * Encode and transmit next frame.
  29  */
  30 static void usb_b_out(struct st5481_bcs *bcs,int buf_nr)
  31 {
  32         struct st5481_b_out *b_out = &bcs->b_out;
  33         struct st5481_adapter *adapter = bcs->adapter;
  34         struct urb *urb;
  35         unsigned int packet_size,offset;
  36         int len,buf_size,bytes_sent;
  37         int i;
  38         struct sk_buff *skb;
  39
  40         if (test_and_set_bit(buf_nr, &b_out->busy)) {
  41                 DBG(4,"ep %d urb %d busy",(bcs->channel+1)*2,buf_nr);
  42                 return;
  43         }
  44         urb = b_out->urb[buf_nr];
  45
  46         // Adjust isoc buffer size according to flow state
  47         if(b_out->flow_event & (OUT_DOWN | OUT_UNDERRUN)) {
  48                 buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST;
  49                 packet_size = SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST;
  50                 DBG(4,"B%d,adjust flow,add %d bytes",bcs->channel+1,B_FLOW_ADJUST);
  51         } else if(b_out->flow_event & OUT_UP){
  52                 buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT - B_FLOW_ADJUST;
  53                 packet_size = SIZE_ISO_PACKETS_B_OUT - B_FLOW_ADJUST;
  54                 DBG(4,"B%d,adjust flow,remove %d bytes",bcs->channel+1,B_FLOW_ADJUST);
  55         } else {
  56                 buf_size = NUM_ISO_PACKETS_B*SIZE_ISO_PACKETS_B_OUT;
  57                 packet_size = 8;
  58         }
  59         b_out->flow_event = 0;
  60
  61         len = 0;
  62         while (len < buf_size) {
  63                 if ((skb = b_out->tx_skb)) {
  64                         DBG_SKB(0x100, skb);
  65                         DBG(4,"B%d,len=%d",bcs->channel+1,skb->len);
  66
  67                         if (bcs->mode == L1_MODE_TRANS) {
  68                                 bytes_sent = buf_size - len;
  69                                 if (skb->len < bytes_sent)
  70                                         bytes_sent = skb->len;
  71                                 {       /* swap tx bytes to get hearable audio data */
  72                                         register unsigned char *src  = skb->data;
  73                                         register unsigned char *dest = urb->transfer_buffer+len;
  74                                         register unsigned int count;
  75                                         for (count = 0; count < bytes_sent; count++)
  76                                                 *dest++ = bitrev8(*src++);
  77                                 }
  78                                 len += bytes_sent;
  79                         } else {
  80                                 len += isdnhdlc_encode(&b_out->hdlc_state,
  81                                                        skb->data, skb->len, &bytes_sent,
  82                                                        urb->transfer_buffer+len, buf_size-len);
  83                         }
  84
  85                         skb_pull(skb, bytes_sent);
  86
  87                         if (!skb->len) {
  88                                 // Frame sent
  89                                 b_out->tx_skb = NULL;
  90                                 B_L1L2(bcs, PH_DATA | CONFIRM, (void *)(unsigned long) skb->truesize);
  91                                 dev_kfree_skb_any(skb);
  92
  93 /*                              if (!(bcs->tx_skb = skb_dequeue(&bcs->sq))) { */
  94 /*                                      st5481B_sched_event(bcs, B_XMTBUFREADY); */
  95 /*                              } */
  96                         }
  97                 } else {
  98                         if (bcs->mode == L1_MODE_TRANS) {
  99                                 memset(urb->transfer_buffer+len, 0xff, buf_size-len);
 100                                 len = buf_size;
 101                         } else {
 102                                 // Send flags
 103                                 len += isdnhdlc_encode(&b_out->hdlc_state,
 104                                                        NULL, 0, &bytes_sent,
 105                                                        urb->transfer_buffer+len, buf_size-len);
 106                         }
 107                 }
 108         }
 109
 110         // Prepare the URB
 111         for (i = 0, offset = 0; offset < len; i++) {
 112                 urb->iso_frame_desc[i].offset = offset;
 113                 urb->iso_frame_desc[i].length = packet_size;
 114                 offset += packet_size;
 115                 packet_size = SIZE_ISO_PACKETS_B_OUT;
 116         }
 117         urb->transfer_buffer_length = len;
 118         urb->number_of_packets = i;
 119         urb->dev = adapter->usb_dev;
 120
 121         DBG_ISO_PACKET(0x200,urb);
 122
 123         SUBMIT_URB(urb, GFP_NOIO);
 124 }
 125
 126 /*
 127  * Start transfering (flags or data) on the B channel, since
 128  * FIFO counters has been set to a non-zero value.
 129  */
 130 static void st5481B_start_xfer(void *context)
 131 {
 132         struct st5481_bcs *bcs = context;
 133
 134         DBG(4,"B%d",bcs->channel+1);
 135
 136         // Start transmitting (flags or data) on B channel
 137
 138         usb_b_out(bcs,0);
 139         usb_b_out(bcs,1);
 140 }
 141
 142 /*
 143  * If the adapter has only 2 LEDs, the green
 144  * LED will blink with a rate depending
 145  * on the number of channels opened.
 146  */
 147 static void led_blink(struct st5481_adapter *adapter)
 148 {
 149         u_char leds = adapter->leds;
 150
 151         // 50 frames/sec for each channel
 152         if (++adapter->led_counter % 50) {
 153                 return;
 154         }
 155
 156         if (adapter->led_counter % 100) {
 157                 leds |= GREEN_LED;
 158         } else {
 159                 leds &= ~GREEN_LED;
 160         }
 161
 162         st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, leds, NULL, NULL);
 163 }
 164
 165 static void usb_b_out_complete(struct urb *urb)
 166 {
 167         struct st5481_bcs *bcs = urb->context;
 168         struct st5481_b_out *b_out = &bcs->b_out;
 169         struct st5481_adapter *adapter = bcs->adapter;
 170         int buf_nr;
 171
 172         buf_nr = get_buf_nr(b_out->urb, urb);
 173         test_and_clear_bit(buf_nr, &b_out->busy);
 174
 175         if (unlikely(urb->status < 0)) {
 176                 switch (urb->status) {
 177                         case -ENOENT:
 178                         case -ESHUTDOWN:
 179                         case -ECONNRESET:
 180                                 DBG(4,"urb killed status %d", urb->status);
 181                                 return; // Give up
 182                         default:
 183                                 WARNING("urb status %d",urb->status);
 184                                 if (b_out->busy == 0) {
 185                                         st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2 | USB_DIR_OUT, NULL, NULL);
 186                                 }
 187                                 break;
 188                 }
 189         }
 190
 191         usb_b_out(bcs,buf_nr);
 192
 193         if (adapter->number_of_leds == 2)
 194                 led_blink(adapter);
 195 }
 196
 197 /*
 198  * Start or stop the transfer on the B channel.
 199  */
 200 static void st5481B_mode(struct st5481_bcs *bcs, int mode)
 201 {
 202         struct st5481_b_out *b_out = &bcs->b_out;
 203         struct st5481_adapter *adapter = bcs->adapter;
 204
 205         DBG(4,"B%d,mode=%d", bcs->channel + 1, mode);
 206
 207         if (bcs->mode == mode)
 208                 return;
 209
 210         bcs->mode = mode;
 211
 212         // Cancel all USB transfers on this B channel
 213         usb_unlink_urb(b_out->urb[0]);
 214         usb_unlink_urb(b_out->urb[1]);
 215         b_out->busy = 0;
 216
 217         st5481_in_mode(&bcs->b_in, mode);
 218         if (bcs->mode != L1_MODE_NULL) {
 219                 // Open the B channel
 220                 if (bcs->mode != L1_MODE_TRANS) {
 221                         u32 features = HDLC_BITREVERSE;
 222                         if (bcs->mode == L1_MODE_HDLC_56K)
 223                                 features |= HDLC_56KBIT;
 224                         isdnhdlc_out_init(&b_out->hdlc_state, features);
 225                 }
 226                 st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2, NULL, NULL);
 227
 228                 // Enable B channel interrupts
 229                 st5481_usb_device_ctrl_msg(adapter, FFMSK_B1+(bcs->channel*2),
 230                                     OUT_UP+OUT_DOWN+OUT_UNDERRUN, NULL, NULL);
 231
 232                 // Enable B channel FIFOs
 233                 st5481_usb_device_ctrl_msg(adapter, OUT_B1_COUNTER+(bcs->channel*2), 32, st5481B_start_xfer, bcs);
 234                 if (adapter->number_of_leds == 4) {
 235                         if (bcs->channel == 0) {
 236                                 adapter->leds |= B1_LED;
 237                         } else {
 238                                 adapter->leds |= B2_LED;
 239                         }
 240                 }
 241         } else {
 242                 // Disble B channel interrupts
 243                 st5481_usb_device_ctrl_msg(adapter, FFMSK_B1+(bcs->channel*2), 0, NULL, NULL);
 244
 245                 // Disable B channel FIFOs
 246                 st5481_usb_device_ctrl_msg(adapter, OUT_B1_COUNTER+(bcs->channel*2), 0, NULL, NULL);
 247
 248                 if (adapter->number_of_leds == 4) {
 249                         if (bcs->channel == 0) {
 250                                 adapter->leds &= ~B1_LED;
 251                         } else {
 252                                 adapter->leds &= ~B2_LED;
 253                         }
 254                 } else {
 255                         st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL);
 256                 }
 257                 if (b_out->tx_skb) {
 258                         dev_kfree_skb_any(b_out->tx_skb);
 259                         b_out->tx_skb = NULL;
 260                 }
 261
 262         }
 263 }
 264
 265 static int st5481_setup_b_out(struct st5481_bcs *bcs)
 266 {
 267         struct usb_device *dev = bcs->adapter->usb_dev;
 268         struct usb_interface *intf;
 269         struct usb_host_interface *altsetting = NULL;
 270         struct usb_host_endpoint *endpoint;
 271         struct st5481_b_out *b_out = &bcs->b_out;
 272
 273         DBG(4,"");
 274
 275         intf = usb_ifnum_to_if(dev, 0);
 276         if (intf)
 277                 altsetting = usb_altnum_to_altsetting(intf, 3);
 278         if (!altsetting)
 279                 return -ENXIO;
 280
 281         // Allocate URBs and buffers for the B channel out
 282         endpoint = &altsetting->endpoint[EP_B1_OUT - 1 + bcs->channel * 2];
 283
 284         DBG(4,"endpoint address=%02x,packet size=%d",
 285             endpoint->desc.bEndpointAddress, le16_to_cpu(endpoint->desc.wMaxPacketSize));
 286
 287         // Allocate memory for 8000bytes/sec + extra bytes if underrun
 288         return st5481_setup_isocpipes(b_out->urb, dev,
 289                                       usb_sndisocpipe(dev, endpoint->desc.bEndpointAddress),
 290                                       NUM_ISO_PACKETS_B, SIZE_ISO_PACKETS_B_OUT,
 291                                       NUM_ISO_PACKETS_B * SIZE_ISO_PACKETS_B_OUT + B_FLOW_ADJUST,
 292                                       usb_b_out_complete, bcs);
 293 }
 294
 295 static void st5481_release_b_out(struct st5481_bcs *bcs)
 296 {
 297         struct st5481_b_out *b_out = &bcs->b_out;
 298
 299         DBG(4,"");
 300
 301         st5481_release_isocpipes(b_out->urb);
 302 }
 303
 304 int st5481_setup_b(struct st5481_bcs *bcs)
 305 {
 306         int retval;
 307
 308         DBG(4,"");
 309
 310         retval = st5481_setup_b_out(bcs);
 311         if (retval)
 312                 goto err;
 313         bcs->b_in.bufsize = HSCX_BUFMAX;
 314         bcs->b_in.num_packets = NUM_ISO_PACKETS_B;
 315         bcs->b_in.packet_size = SIZE_ISO_PACKETS_B_IN;
 316         bcs->b_in.ep = (bcs->channel ? EP_B2_IN : EP_B1_IN) | USB_DIR_IN;
 317         bcs->b_in.counter = bcs->channel ? IN_B2_COUNTER : IN_B1_COUNTER;
 318         bcs->b_in.adapter = bcs->adapter;
 319         bcs->b_in.hisax_if = &bcs->b_if.ifc;
 320         retval = st5481_setup_in(&bcs->b_in);
 321         if (retval)
 322                 goto err_b_out;
 323
 324
 325         return 0;
 326
 327  err_b_out:
 328         st5481_release_b_out(bcs);
 329  err:
 330         return retval;
 331 }
 332
 333 /*
 334  * Release buffers and URBs for the B channels
 335  */
 336 void st5481_release_b(struct st5481_bcs *bcs)
 337 {
 338         DBG(4,"");
 339
 340         st5481_release_in(&bcs->b_in);
 341         st5481_release_b_out(bcs);
 342 }
 343
 344 /*
 345  * st5481_b_l2l1 is the entry point for upper layer routines that want to
 346  * transmit on the B channel.  PH_DATA | REQUEST is a normal packet that
 347  * we either start transmitting (if idle) or queue (if busy).
 348  * PH_PULL | REQUEST can be called to request a callback message
 349  * (PH_PULL | CONFIRM)
 350  * once the link is idle.  After a "pull" callback, the upper layer
 351  * routines can use PH_PULL | INDICATION to send data.
 352  */
 353 void st5481_b_l2l1(struct hisax_if *ifc, int pr, void *arg)
 354 {
 355         struct st5481_bcs *bcs = ifc->priv;
 356         struct sk_buff *skb = arg;
 357         long mode;
 358
 359         DBG(4, "");
 360
 361         switch (pr) {
 362         case PH_DATA | REQUEST:
 363                 BUG_ON(bcs->b_out.tx_skb);
 364                 bcs->b_out.tx_skb = skb;
 365                 break;
 366         case PH_ACTIVATE | REQUEST:
 367                 mode = (long) arg;
 368                 DBG(4,"B%d,PH_ACTIVATE_REQUEST %ld", bcs->channel + 1, mode);
 369                 st5481B_mode(bcs, mode);
 370                 B_L1L2(bcs, PH_ACTIVATE | INDICATION, NULL);
 371                 break;
 372         case PH_DEACTIVATE | REQUEST:
 373                 DBG(4,"B%d,PH_DEACTIVATE_REQUEST", bcs->channel + 1);
 374                 st5481B_mode(bcs, L1_MODE_NULL);
 375                 B_L1L2(bcs, PH_DEACTIVATE | INDICATION, NULL);
 376                 break;
 377         default:
 378                 WARNING("pr %#x\n", pr);
 379         }
 380 }