common/usb_kbd.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter, MPL AG Switzerland
   4  *
   5  * Part of this source has been derived from the Linux USB
   6  * project.
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <errno.h>
  13 #include <malloc.h>
  14 #include <stdio_dev.h>
  15 #include <asm/byteorder.h>
  16
  17 #include <usb.h>
  18
  19 /*
  20  * If overwrite_console returns 1, the stdin, stderr and stdout
  21  * are switched to the serial port, else the settings in the
  22  * environment are used
  23  */
  24 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
  25 extern int overwrite_console(void);
  26 #else
  27 int overwrite_console(void)
  28 {
  29         return 0;
  30 }
  31 #endif
  32
  33 /* Keyboard sampling rate */
  34 #define REPEAT_RATE     40              /* 40msec -> 25cps */
  35 #define REPEAT_DELAY    10              /* 10 x REPEAT_RATE = 400msec */
  36
  37 #define NUM_LOCK        0x53
  38 #define CAPS_LOCK       0x39
  39 #define SCROLL_LOCK     0x47
  40
  41 /* Modifier bits */
  42 #define LEFT_CNTR       (1 << 0)
  43 #define LEFT_SHIFT      (1 << 1)
  44 #define LEFT_ALT        (1 << 2)
  45 #define LEFT_GUI        (1 << 3)
  46 #define RIGHT_CNTR      (1 << 4)
  47 #define RIGHT_SHIFT     (1 << 5)
  48 #define RIGHT_ALT       (1 << 6)
  49 #define RIGHT_GUI       (1 << 7)
  50
  51 /* Size of the keyboard buffer */
  52 #define USB_KBD_BUFFER_LEN      0x20
  53
  54 /* Device name */
  55 #define DEVNAME                 "usbkbd"
  56
  57 /* Keyboard maps */
  58 static const unsigned char usb_kbd_numkey[] = {
  59         '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
  60         '\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
  61         '\\', '#', ';', '\'', '`', ',', '.', '/'
  62 };
  63 static const unsigned char usb_kbd_numkey_shifted[] = {
  64         '!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
  65         '\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
  66         '|', '~', ':', '"', '~', '<', '>', '?'
  67 };
  68
  69 static const unsigned char usb_kbd_num_keypad[] = {
  70         '/', '*', '-', '+', '\r',
  71         '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
  72         '.', 0, 0, 0, '='
  73 };
  74
  75 /*
  76  * map arrow keys to ^F/^B ^N/^P, can't really use the proper
  77  * ANSI sequence for arrow keys because the queuing code breaks
  78  * when a single keypress expands to 3 queue elements
  79  */
  80 static const unsigned char usb_kbd_arrow[] = {
  81         0x6, 0x2, 0xe, 0x10
  82 };
  83
  84 /*
  85  * NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
  86  *       order. See usb_kbd_setled() function!
  87  */
  88 #define USB_KBD_NUMLOCK         (1 << 0)
  89 #define USB_KBD_CAPSLOCK        (1 << 1)
  90 #define USB_KBD_SCROLLLOCK      (1 << 2)
  91 #define USB_KBD_CTRL            (1 << 3)
  92
  93 #define USB_KBD_LEDMASK         \
  94         (USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)
  95
  96 /*
  97  * USB Keyboard reports are 8 bytes in boot protocol.
  98  * Appendix B of HID Device Class Definition 1.11
  99  */
 100 #define USB_KBD_BOOT_REPORT_SIZE 8
 101
 102 struct usb_kbd_pdata {
 103         unsigned long   intpipe;
 104         int             intpktsize;
 105         int             intinterval;
 106         unsigned long   last_report;
 107         struct int_queue *intq;
 108
 109         uint32_t        repeat_delay;
 110
 111         uint32_t        usb_in_pointer;
 112         uint32_t        usb_out_pointer;
 113         uint8_t         usb_kbd_buffer[USB_KBD_BUFFER_LEN];
 114
 115         uint8_t         *new;
 116         uint8_t         old[USB_KBD_BOOT_REPORT_SIZE];
 117
 118         uint8_t         flags;
 119 };
 120
 121 extern int __maybe_unused net_busy_flag;
 122
 123 /* The period of time between two calls of usb_kbd_testc(). */
 124 static unsigned long __maybe_unused kbd_testc_tms;
 125
 126 /* Puts character in the queue and sets up the in and out pointer. */
 127 static void usb_kbd_put_queue(struct usb_kbd_pdata *data, char c)
 128 {
 129         if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
 130                 /* Check for buffer full. */
 131                 if (data->usb_out_pointer == 0)
 132                         return;
 133
 134                 data->usb_in_pointer = 0;
 135         } else {
 136                 /* Check for buffer full. */
 137                 if (data->usb_in_pointer == data->usb_out_pointer - 1)
 138                         return;
 139
 140                 data->usb_in_pointer++;
 141         }
 142
 143         data->usb_kbd_buffer[data->usb_in_pointer] = c;
 144 }
 145
 146 /*
 147  * Set the LEDs. Since this is used in the irq routine, the control job is
 148  * issued with a timeout of 0. This means, that the job is queued without
 149  * waiting for job completion.
 150  */
 151 static void usb_kbd_setled(struct usb_device *dev)
 152 {
 153         struct usb_interface *iface = &dev->config.if_desc[0];
 154         struct usb_kbd_pdata *data = dev->privptr;
 155         ALLOC_ALIGN_BUFFER(uint32_t, leds, 1, USB_DMA_MINALIGN);
 156
 157         *leds = data->flags & USB_KBD_LEDMASK;
 158         usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 159                 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 160                 0x200, iface->desc.bInterfaceNumber, leds, 1, 0);
 161 }
 162
 163 #define CAPITAL_MASK    0x20
 164 /* Translate the scancode in ASCII */
 165 static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
 166                                 unsigned char modifier, int pressed)
 167 {
 168         uint8_t keycode = 0;
 169
 170         /* Key released */
 171         if (pressed == 0) {
 172                 data->repeat_delay = 0;
 173                 return 0;
 174         }
 175
 176         if (pressed == 2) {
 177                 data->repeat_delay++;
 178                 if (data->repeat_delay < REPEAT_DELAY)
 179                         return 0;
 180
 181                 data->repeat_delay = REPEAT_DELAY;
 182         }
 183
 184         /* Alphanumeric values */
 185         if ((scancode > 3) && (scancode <= 0x1d)) {
 186                 keycode = scancode - 4 + 'a';
 187
 188                 if (data->flags & USB_KBD_CAPSLOCK)
 189                         keycode &= ~CAPITAL_MASK;
 190
 191                 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
 192                         /* Handle CAPSLock + Shift pressed simultaneously */
 193                         if (keycode & CAPITAL_MASK)
 194                                 keycode &= ~CAPITAL_MASK;
 195                         else
 196                                 keycode |= CAPITAL_MASK;
 197                 }
 198         }
 199
 200         if ((scancode > 0x1d) && (scancode < 0x3a)) {
 201                 /* Shift pressed */
 202                 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
 203                         keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
 204                 else
 205                         keycode = usb_kbd_numkey[scancode - 0x1e];
 206         }
 207
 208         /* Arrow keys */
 209         if ((scancode >= 0x4f) && (scancode <= 0x52))
 210                 keycode = usb_kbd_arrow[scancode - 0x4f];
 211
 212         /* Numeric keypad */
 213         if ((scancode >= 0x54) && (scancode <= 0x67))
 214                 keycode = usb_kbd_num_keypad[scancode - 0x54];
 215
 216         if (data->flags & USB_KBD_CTRL)
 217                 keycode = scancode - 0x3;
 218
 219         if (pressed == 1) {
 220                 if (scancode == NUM_LOCK) {
 221                         data->flags ^= USB_KBD_NUMLOCK;
 222                         return 1;
 223                 }
 224
 225                 if (scancode == CAPS_LOCK) {
 226                         data->flags ^= USB_KBD_CAPSLOCK;
 227                         return 1;
 228                 }
 229                 if (scancode == SCROLL_LOCK) {
 230                         data->flags ^= USB_KBD_SCROLLLOCK;
 231                         return 1;
 232                 }
 233         }
 234
 235         /* Report keycode if any */
 236         if (keycode) {
 237                 debug("%c", keycode);
 238                 usb_kbd_put_queue(data, keycode);
 239         }
 240
 241         return 0;
 242 }
 243
 244 static uint32_t usb_kbd_service_key(struct usb_device *dev, int i, int up)
 245 {
 246         uint32_t res = 0;
 247         struct usb_kbd_pdata *data = dev->privptr;
 248         uint8_t *new;
 249         uint8_t *old;
 250
 251         if (up) {
 252                 new = data->old;
 253                 old = data->new;
 254         } else {
 255                 new = data->new;
 256                 old = data->old;
 257         }
 258
 259         if ((old[i] > 3) &&
 260             (memscan(new + 2, old[i], USB_KBD_BOOT_REPORT_SIZE - 2) ==
 261                         new + USB_KBD_BOOT_REPORT_SIZE)) {
 262                 res |= usb_kbd_translate(data, old[i], data->new[0], up);
 263         }
 264
 265         return res;
 266 }
 267
 268 /* Interrupt service routine */
 269 static int usb_kbd_irq_worker(struct usb_device *dev)
 270 {
 271         struct usb_kbd_pdata *data = dev->privptr;
 272         int i, res = 0;
 273
 274         /* No combo key pressed */
 275         if (data->new[0] == 0x00)
 276                 data->flags &= ~USB_KBD_CTRL;
 277         /* Left or Right Ctrl pressed */
 278         else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
 279                 data->flags |= USB_KBD_CTRL;
 280
 281         for (i = 2; i < USB_KBD_BOOT_REPORT_SIZE; i++) {
 282                 res |= usb_kbd_service_key(dev, i, 0);
 283                 res |= usb_kbd_service_key(dev, i, 1);
 284         }
 285
 286         /* Key is still pressed */
 287         if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
 288                 res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);
 289
 290         if (res == 1)
 291                 usb_kbd_setled(dev);
 292
 293         memcpy(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE);
 294
 295         return 1;
 296 }
 297
 298 /* Keyboard interrupt handler */
 299 static int usb_kbd_irq(struct usb_device *dev)
 300 {
 301         if ((dev->irq_status != 0) ||
 302             (dev->irq_act_len != USB_KBD_BOOT_REPORT_SIZE)) {
 303                 debug("USB KBD: Error %lX, len %d\n",
 304                       dev->irq_status, dev->irq_act_len);
 305                 return 1;
 306         }
 307
 308         return usb_kbd_irq_worker(dev);
 309 }
 310
 311 /* Interrupt polling */
 312 static inline void usb_kbd_poll_for_event(struct usb_device *dev)
 313 {
 314 #if defined(CONFIG_SYS_USB_EVENT_POLL)
 315         struct usb_kbd_pdata *data = dev->privptr;
 316
 317         /* Submit a interrupt transfer request */
 318         usb_submit_int_msg(dev, data->intpipe, &data->new[0], data->intpktsize,
 319                            data->intinterval);
 320
 321         usb_kbd_irq_worker(dev);
 322 #elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) || \
 323       defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
 324 #if defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
 325         struct usb_interface *iface;
 326         struct usb_kbd_pdata *data = dev->privptr;
 327         iface = &dev->config.if_desc[0];
 328         usb_get_report(dev, iface->desc.bInterfaceNumber,
 329                        1, 0, data->new, USB_KBD_BOOT_REPORT_SIZE);
 330         if (memcmp(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE)) {
 331                 usb_kbd_irq_worker(dev);
 332 #else
 333         struct usb_kbd_pdata *data = dev->privptr;
 334         if (poll_int_queue(dev, data->intq)) {
 335                 usb_kbd_irq_worker(dev);
 336                 /* We've consumed all queued int packets, create new */
 337                 destroy_int_queue(dev, data->intq);
 338                 data->intq = create_int_queue(dev, data->intpipe, 1,
 339                                       USB_KBD_BOOT_REPORT_SIZE, data->new,
 340                                       data->intinterval);
 341 #endif
 342                 data->last_report = get_timer(0);
 343         /* Repeat last usb hid report every REPEAT_RATE ms for keyrepeat */
 344         } else if (data->last_report != -1 &&
 345                    get_timer(data->last_report) > REPEAT_RATE) {
 346                 usb_kbd_irq_worker(dev);
 347                 data->last_report = get_timer(0);
 348         }
 349 #endif
 350 }
 351
 352 /* test if a character is in the queue */
 353 static int usb_kbd_testc(struct stdio_dev *sdev)
 354 {
 355         struct stdio_dev *dev;
 356         struct usb_device *usb_kbd_dev;
 357         struct usb_kbd_pdata *data;
 358
 359 #ifdef CONFIG_CMD_NET
 360         /*
 361          * If net_busy_flag is 1, NET transfer is running,
 362          * then we check key-pressed every second (first check may be
 363          * less than 1 second) to improve TFTP booting performance.
 364          */
 365         if (net_busy_flag && (get_timer(kbd_testc_tms) < CONFIG_SYS_HZ))
 366                 return 0;
 367         kbd_testc_tms = get_timer(0);
 368 #endif
 369         dev = stdio_get_by_name(DEVNAME);
 370         usb_kbd_dev = (struct usb_device *)dev->priv;
 371         data = usb_kbd_dev->privptr;
 372
 373         usb_kbd_poll_for_event(usb_kbd_dev);
 374
 375         return !(data->usb_in_pointer == data->usb_out_pointer);
 376 }
 377
 378 /* gets the character from the queue */
 379 static int usb_kbd_getc(struct stdio_dev *sdev)
 380 {
 381         struct stdio_dev *dev;
 382         struct usb_device *usb_kbd_dev;
 383         struct usb_kbd_pdata *data;
 384
 385         dev = stdio_get_by_name(DEVNAME);
 386         usb_kbd_dev = (struct usb_device *)dev->priv;
 387         data = usb_kbd_dev->privptr;
 388
 389         while (data->usb_in_pointer == data->usb_out_pointer)
 390                 usb_kbd_poll_for_event(usb_kbd_dev);
 391
 392         if (data->usb_out_pointer == USB_KBD_BUFFER_LEN - 1)
 393                 data->usb_out_pointer = 0;
 394         else
 395                 data->usb_out_pointer++;
 396
 397         return data->usb_kbd_buffer[data->usb_out_pointer];
 398 }
 399
 400 /* probes the USB device dev for keyboard type. */
 401 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
 402 {
 403         struct usb_interface *iface;
 404         struct usb_endpoint_descriptor *ep;
 405         struct usb_kbd_pdata *data;
 406
 407         if (dev->descriptor.bNumConfigurations != 1)
 408                 return 0;
 409
 410         iface = &dev->config.if_desc[ifnum];
 411
 412         if (iface->desc.bInterfaceClass != 3)
 413                 return 0;
 414
 415         if (iface->desc.bInterfaceSubClass != 1)
 416                 return 0;
 417
 418         if (iface->desc.bInterfaceProtocol != 1)
 419                 return 0;
 420
 421         if (iface->desc.bNumEndpoints != 1)
 422                 return 0;
 423
 424         ep = &iface->ep_desc[0];
 425
 426         /* Check if endpoint 1 is interrupt endpoint */
 427         if (!(ep->bEndpointAddress & 0x80))
 428                 return 0;
 429
 430         if ((ep->bmAttributes & 3) != 3)
 431                 return 0;
 432
 433         debug("USB KBD: found set protocol...\n");
 434
 435         data = malloc(sizeof(struct usb_kbd_pdata));
 436         if (!data) {
 437                 printf("USB KBD: Error allocating private data\n");
 438                 return 0;
 439         }
 440
 441         /* Clear private data */
 442         memset(data, 0, sizeof(struct usb_kbd_pdata));
 443
 444         /* allocate input buffer aligned and sized to USB DMA alignment */
 445         data->new = memalign(USB_DMA_MINALIGN,
 446                 roundup(USB_KBD_BOOT_REPORT_SIZE, USB_DMA_MINALIGN));
 447
 448         /* Insert private data into USB device structure */
 449         dev->privptr = data;
 450
 451         /* Set IRQ handler */
 452         dev->irq_handle = usb_kbd_irq;
 453
 454         data->intpipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
 455         data->intpktsize = min(usb_maxpacket(dev, data->intpipe),
 456                                USB_KBD_BOOT_REPORT_SIZE);
 457         data->intinterval = ep->bInterval;
 458         data->last_report = -1;
 459
 460         /* We found a USB Keyboard, install it. */
 461         usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
 462
 463         debug("USB KBD: found set idle...\n");
 464 #if !defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) && \
 465     !defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
 466         usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE / 4, 0);
 467 #else
 468         usb_set_idle(dev, iface->desc.bInterfaceNumber, 0, 0);
 469 #endif
 470
 471         debug("USB KBD: enable interrupt pipe...\n");
 472 #ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
 473         data->intq = create_int_queue(dev, data->intpipe, 1,
 474                                       USB_KBD_BOOT_REPORT_SIZE, data->new,
 475                                       data->intinterval);
 476         if (!data->intq) {
 477 #else
 478         if (usb_submit_int_msg(dev, data->intpipe, data->new, data->intpktsize,
 479                                data->intinterval) < 0) {
 480 #endif
 481                 printf("Failed to get keyboard state from device %04x:%04x\n",
 482                        dev->descriptor.idVendor, dev->descriptor.idProduct);
 483                 /* Abort, we don't want to use that non-functional keyboard. */
 484                 return 0;
 485         }
 486
 487         /* Success. */
 488         return 1;
 489 }
 490
 491 static int probe_usb_keyboard(struct usb_device *dev)
 492 {
 493         char *stdinname;
 494         struct stdio_dev usb_kbd_dev;
 495         int error;
 496
 497         /* Try probing the keyboard */
 498         if (usb_kbd_probe(dev, 0) != 1)
 499                 return -ENOENT;
 500
 501         /* Register the keyboard */
 502         debug("USB KBD: register.\n");
 503         memset(&usb_kbd_dev, 0, sizeof(struct stdio_dev));
 504         strcpy(usb_kbd_dev.name, DEVNAME);
 505         usb_kbd_dev.flags =  DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 506         usb_kbd_dev.getc = usb_kbd_getc;
 507         usb_kbd_dev.tstc = usb_kbd_testc;
 508         usb_kbd_dev.priv = (void *)dev;
 509         error = stdio_register(&usb_kbd_dev);
 510         if (error)
 511                 return error;
 512
 513         stdinname = getenv("stdin");
 514 #ifdef CONFIG_CONSOLE_MUX
 515         error = iomux_doenv(stdin, stdinname);
 516         if (error)
 517                 return error;
 518 #else
 519         /* Check if this is the standard input device. */
 520         if (strcmp(stdinname, DEVNAME))
 521                 return 1;
 522
 523         /* Reassign the console */
 524         if (overwrite_console())
 525                 return 1;
 526
 527         error = console_assign(stdin, DEVNAME);
 528         if (error)
 529                 return error;
 530 #endif
 531
 532         return 0;
 533 }
 534
 535 /* Search for keyboard and register it if found. */
 536 int drv_usb_kbd_init(void)
 537 {
 538         int error, i;
 539
 540         debug("%s: Probing for keyboard\n", __func__);
 541 #ifdef CONFIG_DM_USB
 542         /*
 543          * TODO: We should add U_BOOT_USB_DEVICE() declarations to each USB
 544          * keyboard driver and then most of this file can be removed.
 545          */
 546         struct udevice *bus;
 547         struct uclass *uc;
 548         int ret;
 549
 550         ret = uclass_get(UCLASS_USB, &uc);
 551         if (ret)
 552                 return ret;
 553         uclass_foreach_dev(bus, uc) {
 554                 for (i = 0; i < USB_MAX_DEVICE; i++) {
 555                         struct usb_device *dev;
 556
 557                         dev = usb_get_dev_index(bus, i); /* get device */
 558                         debug("i=%d, %p\n", i, dev);
 559                         if (!dev)
 560                                 break; /* no more devices available */
 561
 562                         error = probe_usb_keyboard(dev);
 563                         if (!error)
 564                                 return 1;
 565                         if (error && error != -ENOENT)
 566                                 return error;
 567                 } /* for */
 568         }
 569 #else
 570         /* Scan all USB Devices */
 571         for (i = 0; i < USB_MAX_DEVICE; i++) {
 572                 struct usb_device *dev;
 573
 574                 /* Get USB device. */
 575                 dev = usb_get_dev_index(i);
 576                 if (!dev)
 577                         break;
 578
 579                 if (dev->devnum == -1)
 580                         continue;
 581
 582                 error = probe_usb_keyboard(dev);
 583                 if (!error)
 584                         return 1;
 585                 if (error && error != -ENOENT)
 586                         return error;
 587         }
 588 #endif
 589
 590         /* No USB Keyboard found */
 591         return -1;
 592 }
 593
 594 /* Deregister the keyboard. */
 595 int usb_kbd_deregister(int force)
 596 {
 597 #ifdef CONFIG_SYS_STDIO_DEREGISTER
 598         struct stdio_dev *dev;
 599         struct usb_device *usb_kbd_dev;
 600         struct usb_kbd_pdata *data;
 601
 602         dev = stdio_get_by_name(DEVNAME);
 603         if (dev) {
 604                 usb_kbd_dev = (struct usb_device *)dev->priv;
 605                 data = usb_kbd_dev->privptr;
 606                 if (stdio_deregister_dev(dev, force) != 0)
 607                         return 1;
 608 #ifdef CONFIG_CONSOLE_MUX
 609                 if (iomux_doenv(stdin, getenv("stdin")) != 0)
 610                         return 1;
 611 #endif
 612 #ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
 613                 destroy_int_queue(usb_kbd_dev, data->intq);
 614 #endif
 615                 free(data->new);
 616                 free(data);
 617         }
 618
 619         return 0;
 620 #else
 621         return 1;
 622 #endif
 623 }