drivers/isdn/hisax/st5481_b.c

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