hw/usb-serial.c

   1 /*
   2  * FTDI FT232BM Device emulation
   3  *
   4  * Copyright (c) 2006 CodeSourcery.
   5  * Copyright (c) 2008 Samuel Thibault <samuel.thibault@ens-lyon.org>
   6  * Written by Paul Brook, reused for FTDI by Samuel Thibault
   7  *
   8  * This code is licenced under the LGPL.
   9  */
  10
  11 #include "qemu-common.h"
  12 #include "qemu-error.h"
  13 #include "usb.h"
  14 #include "usb-desc.h"
  15 #include "qemu-char.h"
  16
  17 //#define DEBUG_Serial
  18
  19 #ifdef DEBUG_Serial
  20 #define DPRINTF(fmt, ...) \
  21 do { printf("usb-serial: " fmt , ## __VA_ARGS__); } while (0)
  22 #else
  23 #define DPRINTF(fmt, ...) do {} while(0)
  24 #endif
  25
  26 #define RECV_BUF 384
  27
  28 /* Commands */
  29 #define FTDI_RESET              0
  30 #define FTDI_SET_MDM_CTRL       1
  31 #define FTDI_SET_FLOW_CTRL      2
  32 #define FTDI_SET_BAUD           3
  33 #define FTDI_SET_DATA           4
  34 #define FTDI_GET_MDM_ST         5
  35 #define FTDI_SET_EVENT_CHR      6
  36 #define FTDI_SET_ERROR_CHR      7
  37 #define FTDI_SET_LATENCY        9
  38 #define FTDI_GET_LATENCY        10
  39
  40 #define DeviceOutVendor ((USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
  41 #define DeviceInVendor  ((USB_DIR_IN |USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
  42
  43 /* RESET */
  44
  45 #define FTDI_RESET_SIO  0
  46 #define FTDI_RESET_RX   1
  47 #define FTDI_RESET_TX   2
  48
  49 /* SET_MDM_CTRL */
  50
  51 #define FTDI_DTR        1
  52 #define FTDI_SET_DTR    (FTDI_DTR << 8)
  53 #define FTDI_RTS        2
  54 #define FTDI_SET_RTS    (FTDI_RTS << 8)
  55
  56 /* SET_FLOW_CTRL */
  57
  58 #define FTDI_RTS_CTS_HS         1
  59 #define FTDI_DTR_DSR_HS         2
  60 #define FTDI_XON_XOFF_HS        4
  61
  62 /* SET_DATA */
  63
  64 #define FTDI_PARITY     (0x7 << 8)
  65 #define FTDI_ODD        (0x1 << 8)
  66 #define FTDI_EVEN       (0x2 << 8)
  67 #define FTDI_MARK       (0x3 << 8)
  68 #define FTDI_SPACE      (0x4 << 8)
  69
  70 #define FTDI_STOP       (0x3 << 11)
  71 #define FTDI_STOP1      (0x0 << 11)
  72 #define FTDI_STOP15     (0x1 << 11)
  73 #define FTDI_STOP2      (0x2 << 11)
  74
  75 /* GET_MDM_ST */
  76 /* TODO: should be sent every 40ms */
  77 #define FTDI_CTS  (1<<4)        // CTS line status
  78 #define FTDI_DSR  (1<<5)        // DSR line status
  79 #define FTDI_RI   (1<<6)        // RI line status
  80 #define FTDI_RLSD (1<<7)        // Receive Line Signal Detect
  81
  82 /* Status */
  83
  84 #define FTDI_DR   (1<<0)        // Data Ready
  85 #define FTDI_OE   (1<<1)        // Overrun Err
  86 #define FTDI_PE   (1<<2)        // Parity Err
  87 #define FTDI_FE   (1<<3)        // Framing Err
  88 #define FTDI_BI   (1<<4)        // Break Interrupt
  89 #define FTDI_THRE (1<<5)        // Transmitter Holding Register
  90 #define FTDI_TEMT (1<<6)        // Transmitter Empty
  91 #define FTDI_FIFO (1<<7)        // Error in FIFO
  92
  93 typedef struct {
  94     USBDevice dev;
  95     uint8_t recv_buf[RECV_BUF];
  96     uint16_t recv_ptr;
  97     uint16_t recv_used;
  98     uint8_t event_chr;
  99     uint8_t error_chr;
 100     uint8_t event_trigger;
 101     QEMUSerialSetParams params;
 102     int latency;        /* ms */
 103     CharDriverState *cs;
 104 } USBSerialState;
 105
 106 enum {
 107     STR_MANUFACTURER = 1,
 108     STR_PRODUCT_SERIAL,
 109     STR_PRODUCT_BRAILLE,
 110     STR_SERIALNUMBER,
 111 };
 112
 113 static const USBDescStrings desc_strings = {
 114     [STR_MANUFACTURER]    = "QEMU " QEMU_VERSION,
 115     [STR_PRODUCT_SERIAL]  = "QEMU USB SERIAL",
 116     [STR_PRODUCT_BRAILLE] = "QEMU USB BRAILLE",
 117     [STR_SERIALNUMBER]    = "1",
 118 };
 119
 120 static const USBDescIface desc_iface0 = {
 121     .bInterfaceNumber              = 0,
 122     .bNumEndpoints                 = 2,
 123     .bInterfaceClass               = 0xff,
 124     .bInterfaceSubClass            = 0xff,
 125     .bInterfaceProtocol            = 0xff,
 126     .eps = (USBDescEndpoint[]) {
 127         {
 128             .bEndpointAddress      = USB_DIR_IN | 0x01,
 129             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 130             .wMaxPacketSize        = 64,
 131         },{
 132             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 133             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 134             .wMaxPacketSize        = 64,
 135         },
 136     }
 137 };
 138
 139 static const USBDescDevice desc_device = {
 140     .bcdUSB                        = 0x0200,
 141     .bMaxPacketSize0               = 8,
 142     .bNumConfigurations            = 1,
 143     .confs = (USBDescConfig[]) {
 144         {
 145             .bNumInterfaces        = 1,
 146             .bConfigurationValue   = 1,
 147             .bmAttributes          = 0x80,
 148             .bMaxPower             = 50,
 149             .nif = 1,
 150             .ifs = &desc_iface0,
 151         },
 152     },
 153 };
 154
 155 static const USBDesc desc_serial = {
 156     .id = {
 157         .idVendor          = 0x0403,
 158         .idProduct         = 0x6001,
 159         .bcdDevice         = 0x0400,
 160         .iManufacturer     = STR_MANUFACTURER,
 161         .iProduct          = STR_PRODUCT_SERIAL,
 162         .iSerialNumber     = STR_SERIALNUMBER,
 163     },
 164     .full = &desc_device,
 165     .str  = desc_strings,
 166 };
 167
 168 static const USBDesc desc_braille = {
 169     .id = {
 170         .idVendor          = 0x0403,
 171         .idProduct         = 0xfe72,
 172         .bcdDevice         = 0x0400,
 173         .iManufacturer     = STR_MANUFACTURER,
 174         .iProduct          = STR_PRODUCT_BRAILLE,
 175         .iSerialNumber     = STR_SERIALNUMBER,
 176     },
 177     .full = &desc_device,
 178     .str  = desc_strings,
 179 };
 180
 181 static void usb_serial_reset(USBSerialState *s)
 182 {
 183     /* TODO: Set flow control to none */
 184     s->event_chr = 0x0d;
 185     s->event_trigger = 0;
 186     s->recv_ptr = 0;
 187     s->recv_used = 0;
 188     /* TODO: purge in char driver */
 189 }
 190
 191 static void usb_serial_handle_reset(USBDevice *dev)
 192 {
 193     USBSerialState *s = (USBSerialState *)dev;
 194
 195     DPRINTF("Reset\n");
 196
 197     usb_serial_reset(s);
 198     /* TODO: Reset char device, send BREAK? */
 199 }
 200
 201 static uint8_t usb_get_modem_lines(USBSerialState *s)
 202 {
 203     int flags;
 204     uint8_t ret;
 205
 206     if (qemu_chr_ioctl(s->cs, CHR_IOCTL_SERIAL_GET_TIOCM, &flags) == -ENOTSUP)
 207         return FTDI_CTS|FTDI_DSR|FTDI_RLSD;
 208
 209     ret = 0;
 210     if (flags & CHR_TIOCM_CTS)
 211         ret |= FTDI_CTS;
 212     if (flags & CHR_TIOCM_DSR)
 213         ret |= FTDI_DSR;
 214     if (flags & CHR_TIOCM_RI)
 215         ret |= FTDI_RI;
 216     if (flags & CHR_TIOCM_CAR)
 217         ret |= FTDI_RLSD;
 218
 219     return ret;
 220 }
 221
 222 static int usb_serial_handle_control(USBDevice *dev, USBPacket *p,
 223                int request, int value, int index, int length, uint8_t *data)
 224 {
 225     USBSerialState *s = (USBSerialState *)dev;
 226     int ret;
 227
 228     DPRINTF("got control %x, value %x\n",request, value);
 229     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 230     if (ret >= 0) {
 231         return ret;
 232     }
 233
 234     ret = 0;
 235     switch (request) {
 236     case DeviceRequest | USB_REQ_GET_INTERFACE:
 237         data[0] = 0;
 238         ret = 1;
 239         break;
 240     case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
 241         ret = 0;
 242         break;
 243     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 244         ret = 0;
 245         break;
 246
 247         /* Class specific requests.  */
 248     case DeviceOutVendor | FTDI_RESET:
 249         switch (value) {
 250         case FTDI_RESET_SIO:
 251             usb_serial_reset(s);
 252             break;
 253         case FTDI_RESET_RX:
 254             s->recv_ptr = 0;
 255             s->recv_used = 0;
 256             /* TODO: purge from char device */
 257             break;
 258         case FTDI_RESET_TX:
 259             /* TODO: purge from char device */
 260             break;
 261         }
 262         break;
 263     case DeviceOutVendor | FTDI_SET_MDM_CTRL:
 264     {
 265         static int flags;
 266         qemu_chr_ioctl(s->cs,CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
 267         if (value & FTDI_SET_RTS) {
 268             if (value & FTDI_RTS)
 269                 flags |= CHR_TIOCM_RTS;
 270             else
 271                 flags &= ~CHR_TIOCM_RTS;
 272         }
 273         if (value & FTDI_SET_DTR) {
 274             if (value & FTDI_DTR)
 275                 flags |= CHR_TIOCM_DTR;
 276             else
 277                 flags &= ~CHR_TIOCM_DTR;
 278         }
 279         qemu_chr_ioctl(s->cs,CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
 280         break;
 281     }
 282     case DeviceOutVendor | FTDI_SET_FLOW_CTRL:
 283         /* TODO: ioctl */
 284         break;
 285     case DeviceOutVendor | FTDI_SET_BAUD: {
 286         static const int subdivisors8[8] = { 0, 4, 2, 1, 3, 5, 6, 7 };
 287         int subdivisor8 = subdivisors8[((value & 0xc000) >> 14)
 288                                      | ((index & 1) << 2)];
 289         int divisor = value & 0x3fff;
 290
 291         /* chip special cases */
 292         if (divisor == 1 && subdivisor8 == 0)
 293             subdivisor8 = 4;
 294         if (divisor == 0 && subdivisor8 == 0)
 295             divisor = 1;
 296
 297         s->params.speed = (48000000 / 2) / (8 * divisor + subdivisor8);
 298         qemu_chr_ioctl(s->cs, CHR_IOCTL_SERIAL_SET_PARAMS, &s->params);
 299         break;
 300     }
 301     case DeviceOutVendor | FTDI_SET_DATA:
 302         switch (value & FTDI_PARITY) {
 303             case 0:
 304                 s->params.parity = 'N';
 305                 break;
 306             case FTDI_ODD:
 307                 s->params.parity = 'O';
 308                 break;
 309             case FTDI_EVEN:
 310                 s->params.parity = 'E';
 311                 break;
 312             default:
 313                 DPRINTF("unsupported parity %d\n", value & FTDI_PARITY);
 314                 goto fail;
 315         }
 316         switch (value & FTDI_STOP) {
 317             case FTDI_STOP1:
 318                 s->params.stop_bits = 1;
 319                 break;
 320             case FTDI_STOP2:
 321                 s->params.stop_bits = 2;
 322                 break;
 323             default:
 324                 DPRINTF("unsupported stop bits %d\n", value & FTDI_STOP);
 325                 goto fail;
 326         }
 327         qemu_chr_ioctl(s->cs, CHR_IOCTL_SERIAL_SET_PARAMS, &s->params);
 328         /* TODO: TX ON/OFF */
 329         break;
 330     case DeviceInVendor | FTDI_GET_MDM_ST:
 331         data[0] = usb_get_modem_lines(s) | 1;
 332         data[1] = 0;
 333         ret = 2;
 334         break;
 335     case DeviceOutVendor | FTDI_SET_EVENT_CHR:
 336         /* TODO: handle it */
 337         s->event_chr = value;
 338         break;
 339     case DeviceOutVendor | FTDI_SET_ERROR_CHR:
 340         /* TODO: handle it */
 341         s->error_chr = value;
 342         break;
 343     case DeviceOutVendor | FTDI_SET_LATENCY:
 344         s->latency = value;
 345         break;
 346     case DeviceInVendor | FTDI_GET_LATENCY:
 347         data[0] = s->latency;
 348         ret = 1;
 349         break;
 350     default:
 351     fail:
 352         DPRINTF("got unsupported/bogus control %x, value %x\n", request, value);
 353         ret = USB_RET_STALL;
 354         break;
 355     }
 356     return ret;
 357 }
 358
 359 static int usb_serial_handle_data(USBDevice *dev, USBPacket *p)
 360 {
 361     USBSerialState *s = (USBSerialState *)dev;
 362     int ret = 0;
 363     uint8_t devep = p->devep;
 364     uint8_t *data = p->data;
 365     int len = p->len;
 366     int first_len;
 367
 368     switch (p->pid) {
 369     case USB_TOKEN_OUT:
 370         if (devep != 2)
 371             goto fail;
 372         qemu_chr_write(s->cs, data, len);
 373         break;
 374
 375     case USB_TOKEN_IN:
 376         if (devep != 1)
 377             goto fail;
 378         first_len = RECV_BUF - s->recv_ptr;
 379         if (len <= 2) {
 380             ret = USB_RET_NAK;
 381             break;
 382         }
 383         *data++ = usb_get_modem_lines(s) | 1;
 384         /* We do not have the uart details */
 385         /* handle serial break */
 386         if (s->event_trigger && s->event_trigger & FTDI_BI) {
 387             s->event_trigger &= ~FTDI_BI;
 388             *data = FTDI_BI;
 389             ret = 2;
 390             break;
 391         } else {
 392             *data++ = 0;
 393         }
 394         len -= 2;
 395         if (len > s->recv_used)
 396             len = s->recv_used;
 397         if (!len) {
 398             ret = USB_RET_NAK;
 399             break;
 400         }
 401         if (first_len > len)
 402             first_len = len;
 403         memcpy(data, s->recv_buf + s->recv_ptr, first_len);
 404         if (len > first_len)
 405             memcpy(data + first_len, s->recv_buf, len - first_len);
 406         s->recv_used -= len;
 407         s->recv_ptr = (s->recv_ptr + len) % RECV_BUF;
 408         ret = len + 2;
 409         break;
 410
 411     default:
 412         DPRINTF("Bad token\n");
 413     fail:
 414         ret = USB_RET_STALL;
 415         break;
 416     }
 417
 418     return ret;
 419 }
 420
 421 static void usb_serial_handle_destroy(USBDevice *dev)
 422 {
 423     USBSerialState *s = (USBSerialState *)dev;
 424
 425     qemu_chr_close(s->cs);
 426 }
 427
 428 static int usb_serial_can_read(void *opaque)
 429 {
 430     USBSerialState *s = opaque;
 431     return RECV_BUF - s->recv_used;
 432 }
 433
 434 static void usb_serial_read(void *opaque, const uint8_t *buf, int size)
 435 {
 436     USBSerialState *s = opaque;
 437     int first_size, start;
 438
 439     /* room in the buffer? */
 440     if (size > (RECV_BUF - s->recv_used))
 441         size = RECV_BUF - s->recv_used;
 442
 443     start = s->recv_ptr + s->recv_used;
 444     if (start < RECV_BUF) {
 445         /* copy data to end of buffer */
 446         first_size = RECV_BUF - start;
 447         if (first_size > size)
 448             first_size = size;
 449
 450         memcpy(s->recv_buf + start, buf, first_size);
 451
 452         /* wrap around to front if needed */
 453         if (size > first_size)
 454             memcpy(s->recv_buf, buf + first_size, size - first_size);
 455     } else {
 456         start -= RECV_BUF;
 457         memcpy(s->recv_buf + start, buf, size);
 458     }
 459     s->recv_used += size;
 460 }
 461
 462 static void usb_serial_event(void *opaque, int event)
 463 {
 464     USBSerialState *s = opaque;
 465
 466     switch (event) {
 467         case CHR_EVENT_BREAK:
 468             s->event_trigger |= FTDI_BI;
 469             break;
 470         case CHR_EVENT_FOCUS:
 471             break;
 472         case CHR_EVENT_OPENED:
 473             usb_serial_reset(s);
 474             /* TODO: Reset USB port */
 475             break;
 476     }
 477 }
 478
 479 static int usb_serial_initfn(USBDevice *dev)
 480 {
 481     USBSerialState *s = DO_UPCAST(USBSerialState, dev, dev);
 482
 483     usb_desc_init(dev);
 484
 485     if (!s->cs) {
 486         error_report("Property chardev is required");
 487         return -1;
 488     }
 489
 490     qemu_chr_add_handlers(s->cs, usb_serial_can_read, usb_serial_read,
 491                           usb_serial_event, s);
 492     usb_serial_handle_reset(dev);
 493     return 0;
 494 }
 495
 496 static USBDevice *usb_serial_init(const char *filename)
 497 {
 498     USBDevice *dev;
 499     CharDriverState *cdrv;
 500     uint32_t vendorid = 0, productid = 0;
 501     char label[32];
 502     static int index;
 503
 504     while (*filename && *filename != ':') {
 505         const char *p;
 506         char *e;
 507         if (strstart(filename, "vendorid=", &p)) {
 508             vendorid = strtol(p, &e, 16);
 509             if (e == p || (*e && *e != ',' && *e != ':')) {
 510                 error_report("bogus vendor ID %s", p);
 511                 return NULL;
 512             }
 513             filename = e;
 514         } else if (strstart(filename, "productid=", &p)) {
 515             productid = strtol(p, &e, 16);
 516             if (e == p || (*e && *e != ',' && *e != ':')) {
 517                 error_report("bogus product ID %s", p);
 518                 return NULL;
 519             }
 520             filename = e;
 521         } else {
 522             error_report("unrecognized serial USB option %s", filename);
 523             return NULL;
 524         }
 525         while(*filename == ',')
 526             filename++;
 527     }
 528     if (!*filename) {
 529         error_report("character device specification needed");
 530         return NULL;
 531     }
 532     filename++;
 533
 534     snprintf(label, sizeof(label), "usbserial%d", index++);
 535     cdrv = qemu_chr_open(label, filename, NULL);
 536     if (!cdrv)
 537         return NULL;
 538
 539     dev = usb_create(NULL /* FIXME */, "usb-serial");
 540     if (!dev) {
 541         return NULL;
 542     }
 543     qdev_prop_set_chr(&dev->qdev, "chardev", cdrv);
 544     if (vendorid)
 545         qdev_prop_set_uint16(&dev->qdev, "vendorid", vendorid);
 546     if (productid)
 547         qdev_prop_set_uint16(&dev->qdev, "productid", productid);
 548     qdev_init_nofail(&dev->qdev);
 549
 550     return dev;
 551 }
 552
 553 static USBDevice *usb_braille_init(const char *unused)
 554 {
 555     USBDevice *dev;
 556     CharDriverState *cdrv;
 557
 558     cdrv = qemu_chr_open("braille", "braille", NULL);
 559     if (!cdrv)
 560         return NULL;
 561
 562     dev = usb_create(NULL /* FIXME */, "usb-braille");
 563     qdev_prop_set_chr(&dev->qdev, "chardev", cdrv);
 564     qdev_init_nofail(&dev->qdev);
 565
 566     return dev;
 567 }
 568
 569 static struct USBDeviceInfo serial_info = {
 570     .product_desc   = "QEMU USB Serial",
 571     .qdev.name      = "usb-serial",
 572     .qdev.size      = sizeof(USBSerialState),
 573     .usb_desc       = &desc_serial,
 574     .init           = usb_serial_initfn,
 575     .handle_packet  = usb_generic_handle_packet,
 576     .handle_reset   = usb_serial_handle_reset,
 577     .handle_control = usb_serial_handle_control,
 578     .handle_data    = usb_serial_handle_data,
 579     .handle_destroy = usb_serial_handle_destroy,
 580     .usbdevice_name = "serial",
 581     .usbdevice_init = usb_serial_init,
 582     .qdev.props     = (Property[]) {
 583         DEFINE_PROP_CHR("chardev", USBSerialState, cs),
 584         DEFINE_PROP_END_OF_LIST(),
 585     },
 586 };
 587
 588 static struct USBDeviceInfo braille_info = {
 589     .product_desc   = "QEMU USB Braille",
 590     .qdev.name      = "usb-braille",
 591     .qdev.size      = sizeof(USBSerialState),
 592     .usb_desc       = &desc_braille,
 593     .init           = usb_serial_initfn,
 594     .handle_packet  = usb_generic_handle_packet,
 595     .handle_reset   = usb_serial_handle_reset,
 596     .handle_control = usb_serial_handle_control,
 597     .handle_data    = usb_serial_handle_data,
 598     .handle_destroy = usb_serial_handle_destroy,
 599     .usbdevice_name = "braille",
 600     .usbdevice_init = usb_braille_init,
 601     .qdev.props     = (Property[]) {
 602         DEFINE_PROP_CHR("chardev", USBSerialState, cs),
 603         DEFINE_PROP_END_OF_LIST(),
 604     },
 605 };
 606
 607 static void usb_serial_register_devices(void)
 608 {
 609     usb_qdev_register(&serial_info);
 610     usb_qdev_register(&braille_info);
 611 }
 612 device_init(usb_serial_register_devices)