drivers/serial/usbtty.c

   1 /*
   2  * (C) Copyright 2003
   3  * Gerry Hamel, geh@ti.com, Texas Instruments
   4  *
   5  * (C) Copyright 2006
   6  * Bryan O'Donoghue, bodonoghue@codehermit.ie
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <common.h>
  25
  26 #include <circbuf.h>
  27 #include <devices.h>
  28 #include "usbtty.h"
  29 #include "usb_cdc_acm.h"
  30 #include "usbdescriptors.h"
  31 #include <config.h>             /* If defined, override Linux identifiers with
  32                                  * vendor specific ones */
  33
  34 #if 0
  35 #define TTYDBG(fmt,args...)\
  36         serial_printf("[%s] %s %d: "fmt, __FILE__,__FUNCTION__,__LINE__,##args)
  37 #else
  38 #define TTYDBG(fmt,args...) do{}while(0)
  39 #endif
  40
  41 #if 1
  42 #define TTYERR(fmt,args...)\
  43         serial_printf("ERROR![%s] %s %d: "fmt, __FILE__,__FUNCTION__,\
  44         __LINE__,##args)
  45 #else
  46 #define TTYERR(fmt,args...) do{}while(0)
  47 #endif
  48
  49 /*
  50  * Defines
  51  */
  52 #define NUM_CONFIGS    1
  53 #define MAX_INTERFACES 2
  54 #define NUM_ENDPOINTS  3
  55 #define ACM_TX_ENDPOINT 3
  56 #define ACM_RX_ENDPOINT 2
  57 #define GSERIAL_TX_ENDPOINT 2
  58 #define GSERIAL_RX_ENDPOINT 1
  59 #define NUM_ACM_INTERFACES 2
  60 #define NUM_GSERIAL_INTERFACES 1
  61 #define CONFIG_USBD_DATA_INTERFACE_STR "Bulk Data Interface"
  62 #define CONFIG_USBD_CTRL_INTERFACE_STR "Control Interface"
  63
  64 /*
  65  * Buffers to hold input and output data
  66  */
  67 #define USBTTY_BUFFER_SIZE 256
  68 static circbuf_t usbtty_input;
  69 static circbuf_t usbtty_output;
  70
  71
  72 /*
  73  * Instance variables
  74  */
  75 static device_t usbttydev;
  76 static struct usb_device_instance device_instance[1];
  77 static struct usb_bus_instance bus_instance[1];
  78 static struct usb_configuration_instance config_instance[NUM_CONFIGS];
  79 static struct usb_interface_instance interface_instance[MAX_INTERFACES];
  80 static struct usb_alternate_instance alternate_instance[MAX_INTERFACES];
  81 /* one extra for control endpoint */
  82 static struct usb_endpoint_instance endpoint_instance[NUM_ENDPOINTS+1];
  83
  84 /*
  85  * Global flag
  86  */
  87 int usbtty_configured_flag = 0;
  88
  89 /*
  90  * Serial number
  91  */
  92 static char serial_number[16];
  93
  94
  95 /*
  96  * Descriptors, Strings, Local variables.
  97  */
  98
  99 /* defined and used by usbdcore_ep0.c */
 100 extern struct usb_string_descriptor **usb_strings;
 101
 102 /* Indicies, References */
 103 static unsigned short rx_endpoint = 0;
 104 static unsigned short tx_endpoint = 0;
 105 static unsigned short interface_count = 0;
 106 static struct usb_string_descriptor *usbtty_string_table[STR_COUNT];
 107
 108 /* USB Descriptor Strings */
 109 static u8 wstrLang[4] = {4,USB_DT_STRING,0x9,0x4};
 110 static u8 wstrManufacturer[2 + 2*(sizeof(CONFIG_USBD_MANUFACTURER)-1)];
 111 static u8 wstrProduct[2 + 2*(sizeof(CONFIG_USBD_PRODUCT_NAME)-1)];
 112 static u8 wstrSerial[2 + 2*(sizeof(serial_number) - 1)];
 113 static u8 wstrConfiguration[2 + 2*(sizeof(CONFIG_USBD_CONFIGURATION_STR)-1)];
 114 static u8 wstrDataInterface[2 + 2*(sizeof(CONFIG_USBD_DATA_INTERFACE_STR)-1)];
 115 static u8 wstrCtrlInterface[2 + 2*(sizeof(CONFIG_USBD_DATA_INTERFACE_STR)-1)];
 116
 117 /* Standard USB Data Structures */
 118 static struct usb_interface_descriptor interface_descriptors[MAX_INTERFACES];
 119 static struct usb_endpoint_descriptor *ep_descriptor_ptrs[NUM_ENDPOINTS];
 120 static struct usb_configuration_descriptor      *configuration_descriptor = 0;
 121 static struct usb_device_descriptor device_descriptor = {
 122         .bLength = sizeof(struct usb_device_descriptor),
 123         .bDescriptorType =      USB_DT_DEVICE,
 124         .bcdUSB =               cpu_to_le16(USB_BCD_VERSION),
 125         .bDeviceSubClass =      0x00,
 126         .bDeviceProtocol =      0x00,
 127         .bMaxPacketSize0 =      EP0_MAX_PACKET_SIZE,
 128         .idVendor =             cpu_to_le16(CONFIG_USBD_VENDORID),
 129         .bcdDevice =            cpu_to_le16(USBTTY_BCD_DEVICE),
 130         .iManufacturer =        STR_MANUFACTURER,
 131         .iProduct =             STR_PRODUCT,
 132         .iSerialNumber =        STR_SERIAL,
 133         .bNumConfigurations =   NUM_CONFIGS
 134 };
 135
 136
 137 /*
 138  * Static CDC ACM specific descriptors
 139  */
 140
 141 struct acm_config_desc {
 142         struct usb_configuration_descriptor configuration_desc;
 143
 144         /* Master Interface */
 145         struct usb_interface_descriptor interface_desc;
 146
 147         struct usb_class_header_function_descriptor usb_class_header;
 148         struct usb_class_call_management_descriptor usb_class_call_mgt;
 149         struct usb_class_abstract_control_descriptor usb_class_acm;
 150         struct usb_class_union_function_descriptor usb_class_union;
 151         struct usb_endpoint_descriptor notification_endpoint;
 152
 153         /* Slave Interface */
 154         struct usb_interface_descriptor data_class_interface;
 155         struct usb_endpoint_descriptor
 156                 data_endpoints[NUM_ENDPOINTS-1] __attribute__((packed));
 157 } __attribute__((packed));
 158
 159 static struct acm_config_desc acm_configuration_descriptors[NUM_CONFIGS] = {
 160         {
 161                 .configuration_desc ={
 162                         .bLength =
 163                                 sizeof(struct usb_configuration_descriptor),
 164                         .bDescriptorType = USB_DT_CONFIG,
 165                         .wTotalLength =
 166                                 cpu_to_le16(sizeof(struct acm_config_desc)),
 167                         .bNumInterfaces = NUM_ACM_INTERFACES,
 168                         .bConfigurationValue = 1,
 169                         .iConfiguration = STR_CONFIG,
 170                         .bmAttributes =
 171                                 BMATTRIBUTE_SELF_POWERED|BMATTRIBUTE_RESERVED,
 172                         .bMaxPower = USBTTY_MAXPOWER
 173                 },
 174                 /* Interface 1 */
 175                 .interface_desc = {
 176                         .bLength  = sizeof(struct usb_interface_descriptor),
 177                         .bDescriptorType = USB_DT_INTERFACE,
 178                         .bInterfaceNumber = 0,
 179                         .bAlternateSetting = 0,
 180                         .bNumEndpoints = 0x01,
 181                         .bInterfaceClass =
 182                                 COMMUNICATIONS_INTERFACE_CLASS_CONTROL,
 183                         .bInterfaceSubClass = COMMUNICATIONS_ACM_SUBCLASS,
 184                         .bInterfaceProtocol = COMMUNICATIONS_V25TER_PROTOCOL,
 185                         .iInterface = STR_CTRL_INTERFACE,
 186                 },
 187                 .usb_class_header = {
 188                         .bFunctionLength        =
 189                                 sizeof(struct usb_class_header_function_descriptor),
 190                         .bDescriptorType        = CS_INTERFACE,
 191                         .bDescriptorSubtype     = USB_ST_HEADER,
 192                         .bcdCDC = cpu_to_le16(110),
 193                 },
 194                 .usb_class_call_mgt = {
 195                         .bFunctionLength        =
 196                                 sizeof(struct usb_class_call_management_descriptor),
 197                         .bDescriptorType        = CS_INTERFACE,
 198                         .bDescriptorSubtype     = USB_ST_CMF,
 199                         .bmCapabilities         = 0x00,
 200                         .bDataInterface         = 0x01,
 201                 },
 202                 .usb_class_acm = {
 203                         .bFunctionLength        =
 204                                 sizeof(struct usb_class_abstract_control_descriptor),
 205                         .bDescriptorType        = CS_INTERFACE,
 206                         .bDescriptorSubtype     = USB_ST_ACMF,
 207                         .bmCapabilities         = 0x00,
 208                 },
 209                 .usb_class_union = {
 210                         .bFunctionLength        =
 211                                 sizeof(struct usb_class_union_function_descriptor),
 212                         .bDescriptorType        = CS_INTERFACE,
 213                         .bDescriptorSubtype     = USB_ST_UF,
 214                         .bMasterInterface       = 0x00,
 215                         .bSlaveInterface0       = 0x01,
 216                 },
 217                 .notification_endpoint = {
 218                         .bLength =
 219                                 sizeof(struct usb_endpoint_descriptor),
 220                         .bDescriptorType        = USB_DT_ENDPOINT,
 221                         .bEndpointAddress       = 0x01 | USB_DIR_IN,
 222                         .bmAttributes           = USB_ENDPOINT_XFER_INT,
 223                         .wMaxPacketSize
 224                                 = cpu_to_le16(CONFIG_USBD_SERIAL_INT_PKTSIZE),
 225                         .bInterval              = 0xFF,
 226                 },
 227
 228                 /* Interface 2 */
 229                 .data_class_interface = {
 230                         .bLength                =
 231                                 sizeof(struct usb_interface_descriptor),
 232                         .bDescriptorType        = USB_DT_INTERFACE,
 233                         .bInterfaceNumber       = 0x01,
 234                         .bAlternateSetting      = 0x00,
 235                         .bNumEndpoints          = 0x02,
 236                         .bInterfaceClass        =
 237                                 COMMUNICATIONS_INTERFACE_CLASS_DATA,
 238                         .bInterfaceSubClass     = DATA_INTERFACE_SUBCLASS_NONE,
 239                         .bInterfaceProtocol     = DATA_INTERFACE_PROTOCOL_NONE,
 240                         .iInterface             = STR_DATA_INTERFACE,
 241                 },
 242                 .data_endpoints = {
 243                         {
 244                                 .bLength                =
 245                                         sizeof(struct usb_endpoint_descriptor),
 246                                 .bDescriptorType        = USB_DT_ENDPOINT,
 247                                 .bEndpointAddress       = 0x02 | USB_DIR_OUT,
 248                                 .bmAttributes           =
 249                                         USB_ENDPOINT_XFER_BULK,
 250                                 .wMaxPacketSize         =
 251                                         cpu_to_le16(CONFIG_USBD_SERIAL_BULK_PKTSIZE),
 252                                 .bInterval              = 0xFF,
 253                         },
 254                         {
 255                                 .bLength                =
 256                                         sizeof(struct usb_endpoint_descriptor),
 257                                 .bDescriptorType        = USB_DT_ENDPOINT,
 258                                 .bEndpointAddress       = 0x03 | USB_DIR_IN,
 259                                 .bmAttributes           =
 260                                         USB_ENDPOINT_XFER_BULK,
 261                                 .wMaxPacketSize         =
 262                                         cpu_to_le16(CONFIG_USBD_SERIAL_BULK_PKTSIZE),
 263                                 .bInterval              = 0xFF,
 264                         },
 265                 },
 266         },
 267 };
 268
 269 static struct rs232_emu rs232_desc={
 270                 .dter           =       115200,
 271                 .stop_bits      =       0x00,
 272                 .parity         =       0x00,
 273                 .data_bits      =       0x08
 274 };
 275
 276
 277 /*
 278  * Static Generic Serial specific data
 279  */
 280
 281
 282 struct gserial_config_desc {
 283
 284         struct usb_configuration_descriptor configuration_desc;
 285         struct usb_interface_descriptor
 286                 interface_desc[NUM_GSERIAL_INTERFACES] __attribute__((packed));
 287         struct usb_endpoint_descriptor
 288                 data_endpoints[NUM_ENDPOINTS] __attribute__((packed));
 289
 290 } __attribute__((packed));
 291
 292 static struct gserial_config_desc
 293 gserial_configuration_descriptors[NUM_CONFIGS] ={
 294         {
 295                 .configuration_desc ={
 296                         .bLength = sizeof(struct usb_configuration_descriptor),
 297                         .bDescriptorType = USB_DT_CONFIG,
 298                         .wTotalLength =
 299                                 cpu_to_le16(sizeof(struct gserial_config_desc)),
 300                         .bNumInterfaces = NUM_GSERIAL_INTERFACES,
 301                         .bConfigurationValue = 1,
 302                         .iConfiguration = STR_CONFIG,
 303                         .bmAttributes =
 304                                 BMATTRIBUTE_SELF_POWERED|BMATTRIBUTE_RESERVED,
 305                         .bMaxPower = USBTTY_MAXPOWER
 306                 },
 307                 .interface_desc = {
 308                         {
 309                                 .bLength  =
 310                                         sizeof(struct usb_interface_descriptor),
 311                                 .bDescriptorType = USB_DT_INTERFACE,
 312                                 .bInterfaceNumber = 0,
 313                                 .bAlternateSetting = 0,
 314                                 .bNumEndpoints = NUM_ENDPOINTS,
 315                                 .bInterfaceClass =
 316                                         COMMUNICATIONS_INTERFACE_CLASS_VENDOR,
 317                                 .bInterfaceSubClass =
 318                                         COMMUNICATIONS_NO_SUBCLASS,
 319                                 .bInterfaceProtocol =
 320                                         COMMUNICATIONS_NO_PROTOCOL,
 321                                 .iInterface = STR_DATA_INTERFACE
 322                         },
 323                 },
 324                 .data_endpoints  = {
 325                         {
 326                                 .bLength =
 327                                         sizeof(struct usb_endpoint_descriptor),
 328                                 .bDescriptorType =      USB_DT_ENDPOINT,
 329                                 .bEndpointAddress =     0x01 | USB_DIR_OUT,
 330                                 .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 331                                 .wMaxPacketSize =
 332                                         cpu_to_le16(CONFIG_USBD_SERIAL_OUT_PKTSIZE),
 333                                 .bInterval=             0xFF,
 334                         },
 335                         {
 336                                 .bLength =
 337                                         sizeof(struct usb_endpoint_descriptor),
 338                                 .bDescriptorType =      USB_DT_ENDPOINT,
 339                                 .bEndpointAddress =     0x02 | USB_DIR_IN,
 340                                 .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 341                                 .wMaxPacketSize =
 342                                         cpu_to_le16(CONFIG_USBD_SERIAL_IN_PKTSIZE),
 343                                 .bInterval =            0xFF,
 344                         },
 345                         {
 346                                 .bLength =
 347                                         sizeof(struct usb_endpoint_descriptor),
 348                                 .bDescriptorType =      USB_DT_ENDPOINT,
 349                                 .bEndpointAddress =     0x03 | USB_DIR_IN,
 350                                 .bmAttributes =         USB_ENDPOINT_XFER_INT,
 351                                 .wMaxPacketSize =
 352                                         cpu_to_le16(CONFIG_USBD_SERIAL_INT_PKTSIZE),
 353                                 .bInterval =            0xFF,
 354                         },
 355                 },
 356         },
 357 };
 358
 359 /*
 360  * Static Function Prototypes
 361  */
 362
 363 static void usbtty_init_strings (void);
 364 static void usbtty_init_instances (void);
 365 static void usbtty_init_endpoints (void);
 366 static void usbtty_init_terminal_type(short type);
 367 static void usbtty_event_handler (struct usb_device_instance *device,
 368                                 usb_device_event_t event, int data);
 369 static int usbtty_cdc_setup(struct usb_device_request *request,
 370                                 struct urb *urb);
 371 static int usbtty_configured (void);
 372 static int write_buffer (circbuf_t * buf);
 373 static int fill_buffer (circbuf_t * buf);
 374
 375 void usbtty_poll (void);
 376
 377 /* utility function for converting char* to wide string used by USB */
 378 static void str2wide (char *str, u16 * wide)
 379 {
 380         int i;
 381         for (i = 0; i < strlen (str) && str[i]; i++){
 382                 #if defined(__LITTLE_ENDIAN)
 383                         wide[i] = (u16) str[i];
 384                 #elif defined(__BIG_ENDIAN)
 385                         wide[i] = ((u16)(str[i])<<8);
 386                 #else
 387                         #error "__LITTLE_ENDIAN or __BIG_ENDIAN undefined"
 388                 #endif
 389         }
 390 }
 391
 392 /*
 393  * Test whether a character is in the RX buffer
 394  */
 395
 396 int usbtty_tstc (void)
 397 {
 398         struct usb_endpoint_instance *endpoint =
 399                 &endpoint_instance[rx_endpoint];
 400
 401         /* If no input data exists, allow more RX to be accepted */
 402         if(usbtty_input.size <= 0){
 403                 udc_unset_nak(endpoint->endpoint_address&0x03);
 404         }
 405
 406         usbtty_poll ();
 407         return (usbtty_input.size > 0);
 408 }
 409
 410 /*
 411  * Read a single byte from the usb client port. Returns 1 on success, 0
 412  * otherwise. When the function is succesfull, the character read is
 413  * written into its argument c.
 414  */
 415
 416 int usbtty_getc (void)
 417 {
 418         char c;
 419         struct usb_endpoint_instance *endpoint =
 420                 &endpoint_instance[rx_endpoint];
 421
 422         while (usbtty_input.size <= 0) {
 423                 udc_unset_nak(endpoint->endpoint_address&0x03);
 424                 usbtty_poll ();
 425         }
 426
 427         buf_pop (&usbtty_input, &c, 1);
 428         udc_set_nak(endpoint->endpoint_address&0x03);
 429
 430         return c;
 431 }
 432
 433 /*
 434  * Output a single byte to the usb client port.
 435  */
 436 void usbtty_putc (const char c)
 437 {
 438         buf_push (&usbtty_output, &c, 1);
 439         /* If \n, also do \r */
 440         if (c == '\n')
 441                 buf_push (&usbtty_output, "\r", 1);
 442
 443         /* Poll at end to handle new data... */
 444         if ((usbtty_output.size + 2) >= usbtty_output.totalsize) {
 445                 usbtty_poll ();
 446         }
 447 }
 448
 449 /* usbtty_puts() helper function for finding the next '\n' in a string */
 450 static int next_nl_pos (const char *s)
 451 {
 452         int i;
 453
 454         for (i = 0; s[i] != '\0'; i++) {
 455                 if (s[i] == '\n')
 456                         return i;
 457         }
 458         return i;
 459 }
 460
 461 /*
 462  * Output a string to the usb client port - implementing flow control
 463  */
 464
 465 static void __usbtty_puts (const char *str, int len)
 466 {
 467         int maxlen = usbtty_output.totalsize;
 468         int space, n;
 469
 470         /* break str into chunks < buffer size, if needed */
 471         while (len > 0) {
 472                 usbtty_poll ();
 473
 474                 space = maxlen - usbtty_output.size;
 475                 /* Empty buffer here, if needed, to ensure space... */
 476                 if (space) {
 477                         write_buffer (&usbtty_output);
 478
 479                         n = MIN (space, MIN (len, maxlen));
 480                         buf_push (&usbtty_output, str, n);
 481
 482                         str += n;
 483                         len -= n;
 484                 }
 485         }
 486 }
 487
 488 void usbtty_puts (const char *str)
 489 {
 490         int n;
 491         int len = strlen (str);
 492
 493         /* add '\r' for each '\n' */
 494         while (len > 0) {
 495                 n = next_nl_pos (str);
 496
 497                 if (str[n] == '\n') {
 498                         __usbtty_puts (str, n + 1);
 499                         __usbtty_puts ("\r", 1);
 500                         str += (n + 1);
 501                         len -= (n + 1);
 502                 } else {
 503                         /* No \n found.  All done. */
 504                         __usbtty_puts (str, n);
 505                         break;
 506                 }
 507         }
 508
 509         /* Poll at end to handle new data... */
 510         usbtty_poll ();
 511 }
 512
 513 /*
 514  * Initialize the usb client port.
 515  *
 516  */
 517 int drv_usbtty_init (void)
 518 {
 519         int rc;
 520         char * sn;
 521         char * tt;
 522         int snlen;
 523
 524         /* Ger seiral number */
 525         if (!(sn = getenv("serial#"))) {
 526                 sn = "000000000000";
 527         }
 528         snlen = strlen(sn);
 529         if (snlen > sizeof(serial_number) - 1) {
 530                 printf ("Warning: serial number %s is too long (%d > %lu)\n",
 531                         sn, snlen, (ulong)(sizeof(serial_number) - 1));
 532                 snlen = sizeof(serial_number) - 1;
 533         }
 534         memcpy (serial_number, sn, snlen);
 535         serial_number[snlen] = '\0';
 536
 537         /* Decide on which type of UDC device to be.
 538          */
 539
 540         if(!(tt = getenv("usbtty"))) {
 541                 tt = "generic";
 542         }
 543         usbtty_init_terminal_type(strcmp(tt,"cdc_acm"));
 544
 545         /* prepare buffers... */
 546         buf_init (&usbtty_input, USBTTY_BUFFER_SIZE);
 547         buf_init (&usbtty_output, USBTTY_BUFFER_SIZE);
 548
 549         /* Now, set up USB controller and infrastructure */
 550         udc_init ();            /* Basic USB initialization */
 551
 552         usbtty_init_strings ();
 553         usbtty_init_instances ();
 554
 555         udc_startup_events (device_instance);/* Enable dev, init udc pointers */
 556         udc_connect ();         /* Enable pullup for host detection */
 557
 558         usbtty_init_endpoints ();
 559
 560         /* Device initialization */
 561         memset (&usbttydev, 0, sizeof (usbttydev));
 562
 563         strcpy (usbttydev.name, "usbtty");
 564         usbttydev.ext = 0;      /* No extensions */
 565         usbttydev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_OUTPUT;
 566         usbttydev.tstc = usbtty_tstc;   /* 'tstc' function */
 567         usbttydev.getc = usbtty_getc;   /* 'getc' function */
 568         usbttydev.putc = usbtty_putc;   /* 'putc' function */
 569         usbttydev.puts = usbtty_puts;   /* 'puts' function */
 570
 571         rc = device_register (&usbttydev);
 572
 573         return (rc == 0) ? 1 : rc;
 574 }
 575
 576 static void usbtty_init_strings (void)
 577 {
 578         struct usb_string_descriptor *string;
 579
 580         usbtty_string_table[STR_LANG] =
 581                 (struct usb_string_descriptor*)wstrLang;
 582
 583         string = (struct usb_string_descriptor *) wstrManufacturer;
 584         string->bLength = sizeof(wstrManufacturer);
 585         string->bDescriptorType = USB_DT_STRING;
 586         str2wide (CONFIG_USBD_MANUFACTURER, string->wData);
 587         usbtty_string_table[STR_MANUFACTURER]=string;
 588
 589
 590         string = (struct usb_string_descriptor *) wstrProduct;
 591         string->bLength = sizeof(wstrProduct);
 592         string->bDescriptorType = USB_DT_STRING;
 593         str2wide (CONFIG_USBD_PRODUCT_NAME, string->wData);
 594         usbtty_string_table[STR_PRODUCT]=string;
 595
 596
 597         string = (struct usb_string_descriptor *) wstrSerial;
 598         string->bLength = sizeof(serial_number);
 599         string->bDescriptorType = USB_DT_STRING;
 600         str2wide (serial_number, string->wData);
 601         usbtty_string_table[STR_SERIAL]=string;
 602
 603
 604         string = (struct usb_string_descriptor *) wstrConfiguration;
 605         string->bLength = sizeof(wstrConfiguration);
 606         string->bDescriptorType = USB_DT_STRING;
 607         str2wide (CONFIG_USBD_CONFIGURATION_STR, string->wData);
 608         usbtty_string_table[STR_CONFIG]=string;
 609
 610
 611         string = (struct usb_string_descriptor *) wstrDataInterface;
 612         string->bLength = sizeof(wstrDataInterface);
 613         string->bDescriptorType = USB_DT_STRING;
 614         str2wide (CONFIG_USBD_DATA_INTERFACE_STR, string->wData);
 615         usbtty_string_table[STR_DATA_INTERFACE]=string;
 616
 617         string = (struct usb_string_descriptor *) wstrCtrlInterface;
 618         string->bLength = sizeof(wstrCtrlInterface);
 619         string->bDescriptorType = USB_DT_STRING;
 620         str2wide (CONFIG_USBD_CTRL_INTERFACE_STR, string->wData);
 621         usbtty_string_table[STR_CTRL_INTERFACE]=string;
 622
 623         /* Now, initialize the string table for ep0 handling */
 624         usb_strings = usbtty_string_table;
 625 }
 626
 627 static void usbtty_init_instances (void)
 628 {
 629         int i;
 630
 631         /* initialize device instance */
 632         memset (device_instance, 0, sizeof (struct usb_device_instance));
 633         device_instance->device_state = STATE_INIT;
 634         device_instance->device_descriptor = &device_descriptor;
 635         device_instance->event = usbtty_event_handler;
 636         device_instance->cdc_recv_setup = usbtty_cdc_setup;
 637         device_instance->bus = bus_instance;
 638         device_instance->configurations = NUM_CONFIGS;
 639         device_instance->configuration_instance_array = config_instance;
 640
 641         /* initialize bus instance */
 642         memset (bus_instance, 0, sizeof (struct usb_bus_instance));
 643         bus_instance->device = device_instance;
 644         bus_instance->endpoint_array = endpoint_instance;
 645         bus_instance->max_endpoints = 1;
 646         bus_instance->maxpacketsize = 64;
 647         bus_instance->serial_number_str = serial_number;
 648
 649         /* configuration instance */
 650         memset (config_instance, 0,
 651                 sizeof (struct usb_configuration_instance));
 652         config_instance->interfaces = interface_count;
 653         config_instance->configuration_descriptor = configuration_descriptor;
 654         config_instance->interface_instance_array = interface_instance;
 655
 656         /* interface instance */
 657         memset (interface_instance, 0,
 658                 sizeof (struct usb_interface_instance));
 659         interface_instance->alternates = 1;
 660         interface_instance->alternates_instance_array = alternate_instance;
 661
 662         /* alternates instance */
 663         memset (alternate_instance, 0,
 664                 sizeof (struct usb_alternate_instance));
 665         alternate_instance->interface_descriptor = interface_descriptors;
 666         alternate_instance->endpoints = NUM_ENDPOINTS;
 667         alternate_instance->endpoints_descriptor_array = ep_descriptor_ptrs;
 668
 669         /* endpoint instances */
 670         memset (&endpoint_instance[0], 0,
 671                 sizeof (struct usb_endpoint_instance));
 672         endpoint_instance[0].endpoint_address = 0;
 673         endpoint_instance[0].rcv_packetSize = EP0_MAX_PACKET_SIZE;
 674         endpoint_instance[0].rcv_attributes = USB_ENDPOINT_XFER_CONTROL;
 675         endpoint_instance[0].tx_packetSize = EP0_MAX_PACKET_SIZE;
 676         endpoint_instance[0].tx_attributes = USB_ENDPOINT_XFER_CONTROL;
 677         udc_setup_ep (device_instance, 0, &endpoint_instance[0]);
 678
 679         for (i = 1; i <= NUM_ENDPOINTS; i++) {
 680                 memset (&endpoint_instance[i], 0,
 681                         sizeof (struct usb_endpoint_instance));
 682
 683                 endpoint_instance[i].endpoint_address =
 684                         ep_descriptor_ptrs[i - 1]->bEndpointAddress;
 685
 686                 endpoint_instance[i].rcv_attributes =
 687                         ep_descriptor_ptrs[i - 1]->bmAttributes;
 688
 689                 endpoint_instance[i].rcv_packetSize =
 690                         le16_to_cpu(ep_descriptor_ptrs[i - 1]->wMaxPacketSize);
 691
 692                 endpoint_instance[i].tx_attributes =
 693                         ep_descriptor_ptrs[i - 1]->bmAttributes;
 694
 695                 endpoint_instance[i].tx_packetSize =
 696                         le16_to_cpu(ep_descriptor_ptrs[i - 1]->wMaxPacketSize);
 697
 698                 endpoint_instance[i].tx_attributes =
 699                         ep_descriptor_ptrs[i - 1]->bmAttributes;
 700
 701                 urb_link_init (&endpoint_instance[i].rcv);
 702                 urb_link_init (&endpoint_instance[i].rdy);
 703                 urb_link_init (&endpoint_instance[i].tx);
 704                 urb_link_init (&endpoint_instance[i].done);
 705
 706                 if (endpoint_instance[i].endpoint_address & USB_DIR_IN)
 707                         endpoint_instance[i].tx_urb =
 708                                 usbd_alloc_urb (device_instance,
 709                                                 &endpoint_instance[i]);
 710                 else
 711                         endpoint_instance[i].rcv_urb =
 712                                 usbd_alloc_urb (device_instance,
 713                                                 &endpoint_instance[i]);
 714         }
 715 }
 716
 717 static void usbtty_init_endpoints (void)
 718 {
 719         int i;
 720
 721         bus_instance->max_endpoints = NUM_ENDPOINTS + 1;
 722         for (i = 1; i <= NUM_ENDPOINTS; i++) {
 723                 udc_setup_ep (device_instance, i, &endpoint_instance[i]);
 724         }
 725 }
 726
 727 /* usbtty_init_terminal_type
 728  *
 729  * Do some late binding for our device type.
 730  */
 731 static void usbtty_init_terminal_type(short type)
 732 {
 733         switch(type){
 734                 /* CDC ACM */
 735                 case 0:
 736                         /* Assign endpoint descriptors */
 737                         ep_descriptor_ptrs[0] =
 738                                 &acm_configuration_descriptors[0].notification_endpoint;
 739                         ep_descriptor_ptrs[1] =
 740                                 &acm_configuration_descriptors[0].data_endpoints[0];
 741                         ep_descriptor_ptrs[2] =
 742                                 &acm_configuration_descriptors[0].data_endpoints[1];
 743
 744                         /* Enumerate Device Descriptor */
 745                         device_descriptor.bDeviceClass =
 746                                 COMMUNICATIONS_DEVICE_CLASS;
 747                         device_descriptor.idProduct =
 748                                 cpu_to_le16(CONFIG_USBD_PRODUCTID_CDCACM);
 749
 750                         /* Assign endpoint indices */
 751                         tx_endpoint = ACM_TX_ENDPOINT;
 752                         rx_endpoint = ACM_RX_ENDPOINT;
 753
 754                         /* Configuration Descriptor */
 755                         configuration_descriptor =
 756                                 (struct usb_configuration_descriptor*)
 757                                 &acm_configuration_descriptors;
 758
 759                         /* Interface count */
 760                         interface_count = NUM_ACM_INTERFACES;
 761                 break;
 762
 763                 /* BULK IN/OUT & Default */
 764                 case 1:
 765                 default:
 766                         /* Assign endpoint descriptors */
 767                         ep_descriptor_ptrs[0] =
 768                                 &gserial_configuration_descriptors[0].data_endpoints[0];
 769                         ep_descriptor_ptrs[1] =
 770                                 &gserial_configuration_descriptors[0].data_endpoints[1];
 771                         ep_descriptor_ptrs[2] =
 772                                 &gserial_configuration_descriptors[0].data_endpoints[2];
 773
 774                         /* Enumerate Device Descriptor */
 775                         device_descriptor.bDeviceClass = 0xFF;
 776                         device_descriptor.idProduct =
 777                                 cpu_to_le16(CONFIG_USBD_PRODUCTID_GSERIAL);
 778
 779                         /* Assign endpoint indices */
 780                         tx_endpoint = GSERIAL_TX_ENDPOINT;
 781                         rx_endpoint = GSERIAL_RX_ENDPOINT;
 782
 783                         /* Configuration Descriptor */
 784                         configuration_descriptor =
 785                                 (struct usb_configuration_descriptor*)
 786                                 &gserial_configuration_descriptors;
 787
 788                         /* Interface count */
 789                         interface_count = NUM_GSERIAL_INTERFACES;
 790                 break;
 791         }
 792 }
 793
 794 /******************************************************************************/
 795
 796 static struct urb *next_urb (struct usb_device_instance *device,
 797                              struct usb_endpoint_instance *endpoint)
 798 {
 799         struct urb *current_urb = NULL;
 800         int space;
 801
 802         /* If there's a queue, then we should add to the last urb */
 803         if (!endpoint->tx_queue) {
 804                 current_urb = endpoint->tx_urb;
 805         } else {
 806                 /* Last urb from tx chain */
 807                 current_urb =
 808                         p2surround (struct urb, link, endpoint->tx.prev);
 809         }
 810
 811         /* Make sure this one has enough room */
 812         space = current_urb->buffer_length - current_urb->actual_length;
 813         if (space > 0) {
 814                 return current_urb;
 815         } else {                /* No space here */
 816                 /* First look at done list */
 817                 current_urb = first_urb_detached (&endpoint->done);
 818                 if (!current_urb) {
 819                         current_urb = usbd_alloc_urb (device, endpoint);
 820                 }
 821
 822                 urb_append (&endpoint->tx, current_urb);
 823                 endpoint->tx_queue++;
 824         }
 825         return current_urb;
 826 }
 827
 828 static int write_buffer (circbuf_t * buf)
 829 {
 830         if (!usbtty_configured ()) {
 831                 return 0;
 832         }
 833
 834         struct usb_endpoint_instance *endpoint =
 835                         &endpoint_instance[tx_endpoint];
 836         struct urb *current_urb = NULL;
 837
 838         current_urb = next_urb (device_instance, endpoint);
 839         /* TX data still exists - send it now
 840          */
 841         if(endpoint->sent < current_urb->actual_length){
 842                 if(udc_endpoint_write (endpoint)){
 843                         /* Write pre-empted by RX */
 844                         return -1;
 845                 }
 846         }
 847
 848         if (buf->size) {
 849                 char *dest;
 850
 851                 int space_avail;
 852                 int popnum, popped;
 853                 int total = 0;
 854
 855                 /* Break buffer into urb sized pieces,
 856                  * and link each to the endpoint
 857                  */
 858                 while (buf->size > 0) {
 859
 860                         if (!current_urb) {
 861                                 TTYERR ("current_urb is NULL, buf->size %d\n",
 862                                         buf->size);
 863                                 return total;
 864                         }
 865
 866                         dest = (char*)current_urb->buffer +
 867                                 current_urb->actual_length;
 868
 869                         space_avail =
 870                                 current_urb->buffer_length -
 871                                 current_urb->actual_length;
 872                         popnum = MIN (space_avail, buf->size);
 873                         if (popnum == 0)
 874                                 break;
 875
 876                         popped = buf_pop (buf, dest, popnum);
 877                         if (popped == 0)
 878                                 break;
 879                         current_urb->actual_length += popped;
 880                         total += popped;
 881
 882                         /* If endpoint->last == 0, then transfers have
 883                          * not started on this endpoint
 884                          */
 885                         if (endpoint->last == 0) {
 886                                 if(udc_endpoint_write (endpoint)){
 887                                         /* Write pre-empted by RX */
 888                                         return -1;
 889                                 }
 890                         }
 891
 892                 }/* end while */
 893                 return total;
 894         }
 895
 896         return 0;
 897 }
 898
 899 static int fill_buffer (circbuf_t * buf)
 900 {
 901         struct usb_endpoint_instance *endpoint =
 902                 &endpoint_instance[rx_endpoint];
 903
 904         if (endpoint->rcv_urb && endpoint->rcv_urb->actual_length) {
 905                 unsigned int nb = 0;
 906                 char *src = (char *) endpoint->rcv_urb->buffer;
 907                 unsigned int rx_avail = buf->totalsize - buf->size;
 908
 909                 if(rx_avail >= endpoint->rcv_urb->actual_length){
 910
 911                         nb = endpoint->rcv_urb->actual_length;
 912                         buf_push (buf, src, nb);
 913                         endpoint->rcv_urb->actual_length = 0;
 914
 915                 }
 916                 return nb;
 917         }
 918         return 0;
 919 }
 920
 921 static int usbtty_configured (void)
 922 {
 923         return usbtty_configured_flag;
 924 }
 925
 926 /******************************************************************************/
 927
 928 static void usbtty_event_handler (struct usb_device_instance *device,
 929                                   usb_device_event_t event, int data)
 930 {
 931         switch (event) {
 932         case DEVICE_RESET:
 933         case DEVICE_BUS_INACTIVE:
 934                 usbtty_configured_flag = 0;
 935                 break;
 936         case DEVICE_CONFIGURED:
 937                 usbtty_configured_flag = 1;
 938                 break;
 939
 940         case DEVICE_ADDRESS_ASSIGNED:
 941                 usbtty_init_endpoints ();
 942
 943         default:
 944                 break;
 945         }
 946 }
 947
 948 /******************************************************************************/
 949
 950 int usbtty_cdc_setup(struct usb_device_request *request, struct urb *urb)
 951 {
 952         switch (request->bRequest){
 953
 954                 case ACM_SET_CONTROL_LINE_STATE:        /* Implies DTE ready */
 955                         break;
 956                 case ACM_SEND_ENCAPSULATED_COMMAND :    /* Required */
 957                         break;
 958                 case ACM_SET_LINE_ENCODING :            /* DTE stop/parity bits
 959                                                          * per character */
 960                         break;
 961                 case ACM_GET_ENCAPSULATED_RESPONSE :    /* request response */
 962                         break;
 963                 case ACM_GET_LINE_ENCODING :            /* request DTE rate,
 964                                                          * stop/parity bits */
 965                         memcpy (urb->buffer , &rs232_desc, sizeof(rs232_desc));
 966                         urb->actual_length = sizeof(rs232_desc);
 967
 968                         break;
 969                 default:
 970                         return 1;
 971         }
 972         return 0;
 973 }
 974
 975 /******************************************************************************/
 976
 977 /*
 978  * Since interrupt handling has not yet been implemented, we use this function
 979  * to handle polling.  This is called by the tstc,getc,putc,puts routines to
 980  * update the USB state.
 981  */
 982 void usbtty_poll (void)
 983 {
 984         /* New interrupts? */
 985         udc_irq();
 986
 987         /* Write any output data to host buffer
 988          * (do this before checking interrupts to avoid missing one)
 989          */
 990         if (usbtty_configured ()) {
 991                 write_buffer (&usbtty_output);
 992         }
 993
 994         /* New interrupts? */
 995         udc_irq();
 996
 997         /* Check for new data from host..
 998          * (do this after checking interrupts to get latest data)
 999          */
1000         if (usbtty_configured ()) {
1001                 fill_buffer (&usbtty_input);
1002         }
1003
1004         /* New interrupts? */
1005         udc_irq();
1006
1007 }