hw/usb/dev-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 licensed under the LGPL.
   9  */
  10
  11 #include "qemu/osdep.h"
  12 #include "qapi/error.h"
  13 #include "qemu-common.h"
  14 #include "qemu/cutils.h"
  15 #include "qemu/error-report.h"
  16 #include "hw/usb.h"
  17 #include "desc.h"
  18 #include "chardev/char-serial.h"
  19 #include "chardev/char-fe.h"
  20
  21 //#define DEBUG_Serial
  22
  23 #ifdef DEBUG_Serial
  24 #define DPRINTF(fmt, ...) \
  25 do { printf("usb-serial: " fmt , ## __VA_ARGS__); } while (0)
  26 #else
  27 #define DPRINTF(fmt, ...) do {} while(0)
  28 #endif
  29
  30 #define RECV_BUF 384
  31
  32 /* Commands */
  33 #define FTDI_RESET              0
  34 #define FTDI_SET_MDM_CTRL       1
  35 #define FTDI_SET_FLOW_CTRL      2
  36 #define FTDI_SET_BAUD           3
  37 #define FTDI_SET_DATA           4
  38 #define FTDI_GET_MDM_ST         5
  39 #define FTDI_SET_EVENT_CHR      6
  40 #define FTDI_SET_ERROR_CHR      7
  41 #define FTDI_SET_LATENCY        9
  42 #define FTDI_GET_LATENCY        10
  43
  44 #define DeviceOutVendor ((USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
  45 #define DeviceInVendor  ((USB_DIR_IN |USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
  46
  47 /* RESET */
  48
  49 #define FTDI_RESET_SIO  0
  50 #define FTDI_RESET_RX   1
  51 #define FTDI_RESET_TX   2
  52
  53 /* SET_MDM_CTRL */
  54
  55 #define FTDI_DTR        1
  56 #define FTDI_SET_DTR    (FTDI_DTR << 8)
  57 #define FTDI_RTS        2
  58 #define FTDI_SET_RTS    (FTDI_RTS << 8)
  59
  60 /* SET_FLOW_CTRL */
  61
  62 #define FTDI_RTS_CTS_HS         1
  63 #define FTDI_DTR_DSR_HS         2
  64 #define FTDI_XON_XOFF_HS        4
  65
  66 /* SET_DATA */
  67
  68 #define FTDI_PARITY     (0x7 << 8)
  69 #define FTDI_ODD        (0x1 << 8)
  70 #define FTDI_EVEN       (0x2 << 8)
  71 #define FTDI_MARK       (0x3 << 8)
  72 #define FTDI_SPACE      (0x4 << 8)
  73
  74 #define FTDI_STOP       (0x3 << 11)
  75 #define FTDI_STOP1      (0x0 << 11)
  76 #define FTDI_STOP15     (0x1 << 11)
  77 #define FTDI_STOP2      (0x2 << 11)
  78
  79 /* GET_MDM_ST */
  80 /* TODO: should be sent every 40ms */
  81 #define FTDI_CTS  (1<<4)        // CTS line status
  82 #define FTDI_DSR  (1<<5)        // DSR line status
  83 #define FTDI_RI   (1<<6)        // RI line status
  84 #define FTDI_RLSD (1<<7)        // Receive Line Signal Detect
  85
  86 /* Status */
  87
  88 #define FTDI_DR   (1<<0)        // Data Ready
  89 #define FTDI_OE   (1<<1)        // Overrun Err
  90 #define FTDI_PE   (1<<2)        // Parity Err
  91 #define FTDI_FE   (1<<3)        // Framing Err
  92 #define FTDI_BI   (1<<4)        // Break Interrupt
  93 #define FTDI_THRE (1<<5)        // Transmitter Holding Register
  94 #define FTDI_TEMT (1<<6)        // Transmitter Empty
  95 #define FTDI_FIFO (1<<7)        // Error in FIFO
  96
  97 typedef struct {
  98     USBDevice dev;
  99     uint8_t recv_buf[RECV_BUF];
 100     uint16_t recv_ptr;
 101     uint16_t recv_used;
 102     uint8_t event_chr;
 103     uint8_t error_chr;
 104     uint8_t event_trigger;
 105     QEMUSerialSetParams params;
 106     int latency;        /* ms */
 107     CharBackend cs;
 108 } USBSerialState;
 109
 110 #define TYPE_USB_SERIAL "usb-serial-dev"
 111 #define USB_SERIAL_DEV(obj) OBJECT_CHECK(USBSerialState, (obj), TYPE_USB_SERIAL)
 112
 113 enum {
 114     STR_MANUFACTURER = 1,
 115     STR_PRODUCT_SERIAL,
 116     STR_PRODUCT_BRAILLE,
 117     STR_SERIALNUMBER,
 118 };
 119
 120 static const USBDescStrings desc_strings = {
 121     [STR_MANUFACTURER]    = "QEMU",
 122     [STR_PRODUCT_SERIAL]  = "QEMU USB SERIAL",
 123     [STR_PRODUCT_BRAILLE] = "QEMU USB BAUM BRAILLE",
 124     [STR_SERIALNUMBER]    = "1",
 125 };
 126
 127 static const USBDescIface desc_iface0 = {
 128     .bInterfaceNumber              = 0,
 129     .bNumEndpoints                 = 2,
 130     .bInterfaceClass               = 0xff,
 131     .bInterfaceSubClass            = 0xff,
 132     .bInterfaceProtocol            = 0xff,
 133     .eps = (USBDescEndpoint[]) {
 134         {
 135             .bEndpointAddress      = USB_DIR_IN | 0x01,
 136             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 137             .wMaxPacketSize        = 64,
 138         },{
 139             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 140             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 141             .wMaxPacketSize        = 64,
 142         },
 143     }
 144 };
 145
 146 static const USBDescDevice desc_device = {
 147     .bcdUSB                        = 0x0200,
 148     .bMaxPacketSize0               = 8,
 149     .bNumConfigurations            = 1,
 150     .confs = (USBDescConfig[]) {
 151         {
 152             .bNumInterfaces        = 1,
 153             .bConfigurationValue   = 1,
 154             .bmAttributes          = USB_CFG_ATT_ONE,
 155             .bMaxPower             = 50,
 156             .nif = 1,
 157             .ifs = &desc_iface0,
 158         },
 159     },
 160 };
 161
 162 static const USBDesc desc_serial = {
 163     .id = {
 164         .idVendor          = 0x0403,
 165         .idProduct         = 0x6001,
 166         .bcdDevice         = 0x0400,
 167         .iManufacturer     = STR_MANUFACTURER,
 168         .iProduct          = STR_PRODUCT_SERIAL,
 169         .iSerialNumber     = STR_SERIALNUMBER,
 170     },
 171     .full = &desc_device,
 172     .str  = desc_strings,
 173 };
 174
 175 static const USBDesc desc_braille = {
 176     .id = {
 177         .idVendor          = 0x0403,
 178         .idProduct         = 0xfe72,
 179         .bcdDevice         = 0x0400,
 180         .iManufacturer     = STR_MANUFACTURER,
 181         .iProduct          = STR_PRODUCT_BRAILLE,
 182         .iSerialNumber     = STR_SERIALNUMBER,
 183     },
 184     .full = &desc_device,
 185     .str  = desc_strings,
 186 };
 187
 188 static void usb_serial_reset(USBSerialState *s)
 189 {
 190     /* TODO: Set flow control to none */
 191     s->event_chr = 0x0d;
 192     s->event_trigger = 0;
 193     s->recv_ptr = 0;
 194     s->recv_used = 0;
 195     /* TODO: purge in char driver */
 196 }
 197
 198 static void usb_serial_handle_reset(USBDevice *dev)
 199 {
 200     USBSerialState *s = (USBSerialState *)dev;
 201
 202     DPRINTF("Reset\n");
 203
 204     usb_serial_reset(s);
 205     /* TODO: Reset char device, send BREAK? */
 206 }
 207
 208 static uint8_t usb_get_modem_lines(USBSerialState *s)
 209 {
 210     int flags;
 211     uint8_t ret;
 212
 213     if (qemu_chr_fe_ioctl(&s->cs,
 214                           CHR_IOCTL_SERIAL_GET_TIOCM, &flags) == -ENOTSUP) {
 215         return FTDI_CTS|FTDI_DSR|FTDI_RLSD;
 216     }
 217
 218     ret = 0;
 219     if (flags & CHR_TIOCM_CTS)
 220         ret |= FTDI_CTS;
 221     if (flags & CHR_TIOCM_DSR)
 222         ret |= FTDI_DSR;
 223     if (flags & CHR_TIOCM_RI)
 224         ret |= FTDI_RI;
 225     if (flags & CHR_TIOCM_CAR)
 226         ret |= FTDI_RLSD;
 227
 228     return ret;
 229 }
 230
 231 static void usb_serial_handle_control(USBDevice *dev, USBPacket *p,
 232                int request, int value, int index, int length, uint8_t *data)
 233 {
 234     USBSerialState *s = (USBSerialState *)dev;
 235     int ret;
 236
 237     DPRINTF("got control %x, value %x\n",request, value);
 238     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 239     if (ret >= 0) {
 240         return;
 241     }
 242
 243     switch (request) {
 244     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 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_fe_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_fe_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_fe_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_fe_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         p->actual_length = 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         p->actual_length = 1;
 349         break;
 350     default:
 351     fail:
 352         DPRINTF("got unsupported/bogus control %x, value %x\n", request, value);
 353         p->status = USB_RET_STALL;
 354         break;
 355     }
 356 }
 357
 358 static void usb_serial_handle_data(USBDevice *dev, USBPacket *p)
 359 {
 360     USBSerialState *s = (USBSerialState *)dev;
 361     uint8_t devep = p->ep->nr;
 362     struct iovec *iov;
 363     uint8_t header[2];
 364     int i, first_len, len;
 365
 366     switch (p->pid) {
 367     case USB_TOKEN_OUT:
 368         if (devep != 2)
 369             goto fail;
 370         for (i = 0; i < p->iov.niov; i++) {
 371             iov = p->iov.iov + i;
 372             /* XXX this blocks entire thread. Rewrite to use
 373              * qemu_chr_fe_write and background I/O callbacks */
 374             qemu_chr_fe_write_all(&s->cs, iov->iov_base, iov->iov_len);
 375         }
 376         p->actual_length = p->iov.size;
 377         break;
 378
 379     case USB_TOKEN_IN:
 380         if (devep != 1)
 381             goto fail;
 382         first_len = RECV_BUF - s->recv_ptr;
 383         len = p->iov.size;
 384         if (len <= 2) {
 385             p->status = USB_RET_NAK;
 386             break;
 387         }
 388         header[0] = usb_get_modem_lines(s) | 1;
 389         /* We do not have the uart details */
 390         /* handle serial break */
 391         if (s->event_trigger && s->event_trigger & FTDI_BI) {
 392             s->event_trigger &= ~FTDI_BI;
 393             header[1] = FTDI_BI;
 394             usb_packet_copy(p, header, 2);
 395             break;
 396         } else {
 397             header[1] = 0;
 398         }
 399         len -= 2;
 400         if (len > s->recv_used)
 401             len = s->recv_used;
 402         if (!len) {
 403             p->status = USB_RET_NAK;
 404             break;
 405         }
 406         if (first_len > len)
 407             first_len = len;
 408         usb_packet_copy(p, header, 2);
 409         usb_packet_copy(p, s->recv_buf + s->recv_ptr, first_len);
 410         if (len > first_len)
 411             usb_packet_copy(p, s->recv_buf, len - first_len);
 412         s->recv_used -= len;
 413         s->recv_ptr = (s->recv_ptr + len) % RECV_BUF;
 414         break;
 415
 416     default:
 417         DPRINTF("Bad token\n");
 418     fail:
 419         p->status = USB_RET_STALL;
 420         break;
 421     }
 422 }
 423
 424 static int usb_serial_can_read(void *opaque)
 425 {
 426     USBSerialState *s = opaque;
 427
 428     if (!s->dev.attached) {
 429         return 0;
 430     }
 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_OPENED:
 471             if (!s->dev.attached) {
 472                 usb_device_attach(&s->dev, &error_abort);
 473             }
 474             break;
 475         case CHR_EVENT_CLOSED:
 476             if (s->dev.attached) {
 477                 usb_device_detach(&s->dev);
 478             }
 479             break;
 480     }
 481 }
 482
 483 static void usb_serial_realize(USBDevice *dev, Error **errp)
 484 {
 485     USBSerialState *s = USB_SERIAL_DEV(dev);
 486     Error *local_err = NULL;
 487
 488     usb_desc_create_serial(dev);
 489     usb_desc_init(dev);
 490     dev->auto_attach = 0;
 491
 492     if (!qemu_chr_fe_backend_connected(&s->cs)) {
 493         error_setg(errp, "Property chardev is required");
 494         return;
 495     }
 496
 497     usb_check_attach(dev, &local_err);
 498     if (local_err) {
 499         error_propagate(errp, local_err);
 500         return;
 501     }
 502
 503     qemu_chr_fe_set_handlers(&s->cs, usb_serial_can_read, usb_serial_read,
 504                              usb_serial_event, NULL, s, NULL, true);
 505     usb_serial_handle_reset(dev);
 506
 507     if (qemu_chr_fe_backend_open(&s->cs) && !dev->attached) {
 508         usb_device_attach(dev, &error_abort);
 509     }
 510 }
 511
 512 static USBDevice *usb_braille_init(USBBus *bus, const char *unused)
 513 {
 514     USBDevice *dev;
 515     Chardev *cdrv;
 516
 517     cdrv = qemu_chr_new("braille", "braille");
 518     if (!cdrv)
 519         return NULL;
 520
 521     dev = usb_create(bus, "usb-braille");
 522     qdev_prop_set_chr(&dev->qdev, "chardev", cdrv);
 523     return dev;
 524 }
 525
 526 static const VMStateDescription vmstate_usb_serial = {
 527     .name = "usb-serial",
 528     .unmigratable = 1,
 529 };
 530
 531 static Property serial_properties[] = {
 532     DEFINE_PROP_CHR("chardev", USBSerialState, cs),
 533     DEFINE_PROP_END_OF_LIST(),
 534 };
 535
 536 static void usb_serial_dev_class_init(ObjectClass *klass, void *data)
 537 {
 538     DeviceClass *dc = DEVICE_CLASS(klass);
 539     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 540
 541     uc->realize        = usb_serial_realize;
 542     uc->handle_reset   = usb_serial_handle_reset;
 543     uc->handle_control = usb_serial_handle_control;
 544     uc->handle_data    = usb_serial_handle_data;
 545     dc->vmsd = &vmstate_usb_serial;
 546     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 547 }
 548
 549 static const TypeInfo usb_serial_dev_type_info = {
 550     .name = TYPE_USB_SERIAL,
 551     .parent = TYPE_USB_DEVICE,
 552     .instance_size = sizeof(USBSerialState),
 553     .abstract = true,
 554     .class_init = usb_serial_dev_class_init,
 555 };
 556
 557 static void usb_serial_class_initfn(ObjectClass *klass, void *data)
 558 {
 559     DeviceClass *dc = DEVICE_CLASS(klass);
 560     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 561
 562     uc->product_desc   = "QEMU USB Serial";
 563     uc->usb_desc       = &desc_serial;
 564     dc->props = serial_properties;
 565 }
 566
 567 static const TypeInfo serial_info = {
 568     .name          = "usb-serial",
 569     .parent        = TYPE_USB_SERIAL,
 570     .class_init    = usb_serial_class_initfn,
 571 };
 572
 573 static Property braille_properties[] = {
 574     DEFINE_PROP_CHR("chardev", USBSerialState, cs),
 575     DEFINE_PROP_END_OF_LIST(),
 576 };
 577
 578 static void usb_braille_class_initfn(ObjectClass *klass, void *data)
 579 {
 580     DeviceClass *dc = DEVICE_CLASS(klass);
 581     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 582
 583     uc->product_desc   = "QEMU USB Braille";
 584     uc->usb_desc       = &desc_braille;
 585     dc->props = braille_properties;
 586 }
 587
 588 static const TypeInfo braille_info = {
 589     .name          = "usb-braille",
 590     .parent        = TYPE_USB_SERIAL,
 591     .class_init    = usb_braille_class_initfn,
 592 };
 593
 594 static void usb_serial_register_types(void)
 595 {
 596     type_register_static(&usb_serial_dev_type_info);
 597     type_register_static(&serial_info);
 598     type_register_static(&braille_info);
 599     usb_legacy_register("usb-braille", "braille", usb_braille_init);
 600 }
 601
 602 type_init(usb_serial_register_types)