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 <memalign.h>
  15 #include <stdio_dev.h>
  16 #include <asm/byteorder.h>
  17
  18 #include <usb.h>
  19
  20 /*
  21  * If overwrite_console returns 1, the stdin, stderr and stdout
  22  * are switched to the serial port, else the settings in the
  23  * environment are used
  24  */
  25 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
  26 extern int overwrite_console(void);
  27 #else
  28 int overwrite_console(void)
  29 {
  30         return 0;
  31 }
  32 #endif
  33
  34 /* Keyboard sampling rate */
  35 #define REPEAT_RATE     40              /* 40msec -> 25cps */
  36 #define REPEAT_DELAY    10              /* 10 x REPEAT_RATE = 400msec */
  37
  38 #define NUM_LOCK        0x53
  39 #define CAPS_LOCK       0x39
  40 #define SCROLL_LOCK     0x47
  41
  42 /* Modifier bits */
  43 #define LEFT_CNTR       (1 << 0)
  44 #define LEFT_SHIFT      (1 << 1)
  45 #define LEFT_ALT        (1 << 2)
  46 #define LEFT_GUI        (1 << 3)
  47 #define RIGHT_CNTR      (1 << 4)
  48 #define RIGHT_SHIFT     (1 << 5)
  49 #define RIGHT_ALT       (1 << 6)
  50 #define RIGHT_GUI       (1 << 7)
  51
  52 /* Size of the keyboard buffer */
  53 #define USB_KBD_BUFFER_LEN      0x20
  54
  55 /* Device name */
  56 #define DEVNAME                 "usbkbd"
  57
  58 /* Keyboard maps */
  59 static const unsigned char usb_kbd_numkey[] = {
  60         '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
  61         '\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
  62         '\\', '#', ';', '\'', '`', ',', '.', '/'
  63 };
  64 static const unsigned char usb_kbd_numkey_shifted[] = {
  65         '!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
  66         '\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
  67         '|', '~', ':', '"', '~', '<', '>', '?'
  68 };
  69
  70 static const unsigned char usb_kbd_num_keypad[] = {
  71         '/', '*', '-', '+', '\r',
  72         '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
  73         '.', 0, 0, 0, '='
  74 };
  75
  76 /*
  77  * map arrow keys to ^F/^B ^N/^P, can't really use the proper
  78  * ANSI sequence for arrow keys because the queuing code breaks
  79  * when a single keypress expands to 3 queue elements
  80  */
  81 static const unsigned char usb_kbd_arrow[] = {
  82         0x6, 0x2, 0xe, 0x10
  83 };
  84
  85 /*
  86  * NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
  87  *       order. See usb_kbd_setled() function!
  88  */
  89 #define USB_KBD_NUMLOCK         (1 << 0)
  90 #define USB_KBD_CAPSLOCK        (1 << 1)
  91 #define USB_KBD_SCROLLLOCK      (1 << 2)
  92 #define USB_KBD_CTRL            (1 << 3)
  93
  94 #define USB_KBD_LEDMASK         \
  95         (USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)
  96
  97 /*
  98  * USB Keyboard reports are 8 bytes in boot protocol.
  99  * Appendix B of HID Device Class Definition 1.11
 100  */
 101 #define USB_KBD_BOOT_REPORT_SIZE 8
 102
 103 struct usb_kbd_pdata {
 104         unsigned long   intpipe;
 105         int             intpktsize;
 106         int             intinterval;
 107         unsigned long   last_report;
 108         struct int_queue *intq;
 109
 110         uint32_t        repeat_delay;
 111
 112         uint32_t        usb_in_pointer;
 113         uint32_t        usb_out_pointer;
 114         uint8_t         usb_kbd_buffer[USB_KBD_BUFFER_LEN];
 115
 116         uint8_t         *new;
 117         uint8_t         old[USB_KBD_BOOT_REPORT_SIZE];
 118
 119         uint8_t         flags;
 120 };
 121
 122 extern int __maybe_unused net_busy_flag;
 123
 124 /* The period of time between two calls of usb_kbd_testc(). */
 125 static unsigned long __maybe_unused kbd_testc_tms;
 126
 127 /* Puts character in the queue and sets up the in and out pointer. */
 128 static void usb_kbd_put_queue(struct usb_kbd_pdata *data, char c)
 129 {
 130         if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
 131                 /* Check for buffer full. */
 132                 if (data->usb_out_pointer == 0)
 133                         return;
 134
 135                 data->usb_in_pointer = 0;
 136         } else {
 137                 /* Check for buffer full. */
 138                 if (data->usb_in_pointer == data->usb_out_pointer - 1)
 139                         return;
 140
 141                 data->usb_in_pointer++;
 142         }
 143
 144         data->usb_kbd_buffer[data->usb_in_pointer] = c;
 145 }
 146
 147 /*
 148  * Set the LEDs. Since this is used in the irq routine, the control job is
 149  * issued with a timeout of 0. This means, that the job is queued without
 150  * waiting for job completion.
 151  */
 152 static void usb_kbd_setled(struct usb_device *dev)
 153 {
 154         struct usb_interface *iface = &dev->config.if_desc[0];
 155         struct usb_kbd_pdata *data = dev->privptr;
 156         ALLOC_ALIGN_BUFFER(uint32_t, leds, 1, USB_DMA_MINALIGN);
 157
 158         *leds = data->flags & USB_KBD_LEDMASK;
 159         usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 160                 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 161                 0x200, iface->desc.bInterfaceNumber, leds, 1, 0);
 162 }
 163
 164 #define CAPITAL_MASK    0x20
 165 /* Translate the scancode in ASCII */
 166 static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
 167                                 unsigned char modifier, int pressed)
 168 {
 169         uint8_t keycode = 0;
 170
 171         /* Key released */
 172         if (pressed == 0) {
 173                 data->repeat_delay = 0;
 174                 return 0;
 175         }
 176
 177         if (pressed == 2) {
 178                 data->repeat_delay++;
 179                 if (data->repeat_delay < REPEAT_DELAY)
 180                         return 0;
 181
 182                 data->repeat_delay = REPEAT_DELAY;
 183         }
 184
 185         /* Alphanumeric values */
 186         if ((scancode > 3) && (scancode <= 0x1d)) {
 187                 keycode = scancode - 4 + 'a';
 188
 189                 if (data->flags & USB_KBD_CAPSLOCK)
 190                         keycode &= ~CAPITAL_MASK;
 191
 192                 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
 193                         /* Handle CAPSLock + Shift pressed simultaneously */
 194                         if (keycode & CAPITAL_MASK)
 195                                 keycode &= ~CAPITAL_MASK;
 196                         else
 197                                 keycode |= CAPITAL_MASK;
 198                 }
 199         }
 200
 201         if ((scancode > 0x1d) && (scancode < 0x3a)) {
 202                 /* Shift pressed */
 203                 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
 204                         keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
 205                 else
 206                         keycode = usb_kbd_numkey[scancode - 0x1e];
 207         }
 208
 209         /* Arrow keys */
 210         if ((scancode >= 0x4f) && (scancode <= 0x52))
 211                 keycode = usb_kbd_arrow[scancode - 0x4f];
 212
 213         /* Numeric keypad */
 214         if ((scancode >= 0x54) && (scancode <= 0x67))
 215                 keycode = usb_kbd_num_keypad[scancode - 0x54];
 216
 217         if (data->flags & USB_KBD_CTRL)
 218                 keycode = scancode - 0x3;
 219
 220         if (pressed == 1) {
 221                 if (scancode == NUM_LOCK) {
 222                         data->flags ^= USB_KBD_NUMLOCK;
 223                         return 1;
 224                 }
 225
 226                 if (scancode == CAPS_LOCK) {
 227                         data->flags ^= USB_KBD_CAPSLOCK;
 228                         return 1;
 229                 }
 230                 if (scancode == SCROLL_LOCK) {
 231                         data->flags ^= USB_KBD_SCROLLLOCK;
 232                         return 1;
 233                 }
 234         }
 235
 236         /* Report keycode if any */
 237         if (keycode) {
 238                 debug("%c", keycode);
 239                 usb_kbd_put_queue(data, keycode);
 240         }
 241
 242         return 0;
 243 }
 244
 245 static uint32_t usb_kbd_service_key(struct usb_device *dev, int i, int up)
 246 {
 247         uint32_t res = 0;
 248         struct usb_kbd_pdata *data = dev->privptr;
 249         uint8_t *new;
 250         uint8_t *old;
 251
 252         if (up) {
 253                 new = data->old;
 254                 old = data->new;
 255         } else {
 256                 new = data->new;
 257                 old = data->old;
 258         }
 259
 260         if ((old[i] > 3) &&
 261             (memscan(new + 2, old[i], USB_KBD_BOOT_REPORT_SIZE - 2) ==
 262                         new + USB_KBD_BOOT_REPORT_SIZE)) {
 263                 res |= usb_kbd_translate(data, old[i], data->new[0], up);
 264         }
 265
 266         return res;
 267 }
 268
 269 /* Interrupt service routine */
 270 static int usb_kbd_irq_worker(struct usb_device *dev)
 271 {
 272         struct usb_kbd_pdata *data = dev->privptr;
 273         int i, res = 0;
 274
 275         /* No combo key pressed */
 276         if (data->new[0] == 0x00)
 277                 data->flags &= ~USB_KBD_CTRL;
 278         /* Left or Right Ctrl pressed */
 279         else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
 280                 data->flags |= USB_KBD_CTRL;
 281
 282         for (i = 2; i < USB_KBD_BOOT_REPORT_SIZE; i++) {
 283                 res |= usb_kbd_service_key(dev, i, 0);
 284                 res |= usb_kbd_service_key(dev, i, 1);
 285         }
 286
 287         /* Key is still pressed */
 288         if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
 289                 res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);
 290
 291         if (res == 1)
 292                 usb_kbd_setled(dev);
 293
 294         memcpy(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE);
 295
 296         return 1;
 297 }
 298
 299 /* Keyboard interrupt handler */
 300 static int usb_kbd_irq(struct usb_device *dev)
 301 {
 302         if ((dev->irq_status != 0) ||
 303             (dev->irq_act_len != USB_KBD_BOOT_REPORT_SIZE)) {
 304                 debug("USB KBD: Error %lX, len %d\n",
 305                       dev->irq_status, dev->irq_act_len);
 306                 return 1;
 307         }
 308
 309         return usb_kbd_irq_worker(dev);
 310 }
 311
 312 /* Interrupt polling */
 313 static inline void usb_kbd_poll_for_event(struct usb_device *dev)
 314 {
 315 #if defined(CONFIG_SYS_USB_EVENT_POLL)
 316         struct usb_kbd_pdata *data = dev->privptr;
 317
 318         /* Submit a interrupt transfer request */
 319         usb_submit_int_msg(dev, data->intpipe, &data->new[0], data->intpktsize,
 320                            data->intinterval);
 321
 322         usb_kbd_irq_worker(dev);
 323 #elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) || \
 324       defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
 325 #if defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
 326         struct usb_interface *iface;
 327         struct usb_kbd_pdata *data = dev->privptr;
 328         iface = &dev->config.if_desc[0];
 329         usb_get_report(dev, iface->desc.bInterfaceNumber,
 330                        1, 0, data->new, USB_KBD_BOOT_REPORT_SIZE);
 331         if (memcmp(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE)) {
 332                 usb_kbd_irq_worker(dev);
 333 #else
 334         struct usb_kbd_pdata *data = dev->privptr;
 335         if (poll_int_queue(dev, data->intq)) {
 336                 usb_kbd_irq_worker(dev);
 337                 /* We've consumed all queued int packets, create new */
 338                 destroy_int_queue(dev, data->intq);
 339                 data->intq = create_int_queue(dev, data->intpipe, 1,
 340                                       USB_KBD_BOOT_REPORT_SIZE, data->new,
 341                                       data->intinterval);
 342 #endif
 343                 data->last_report = get_timer(0);
 344         /* Repeat last usb hid report every REPEAT_RATE ms for keyrepeat */
 345         } else if (data->last_report != -1 &&
 346                    get_timer(data->last_report) > REPEAT_RATE) {
 347                 usb_kbd_irq_worker(dev);
 348                 data->last_report = get_timer(0);
 349         }
 350 #endif
 351 }
 352
 353 /* test if a character is in the queue */
 354 static int usb_kbd_testc(struct stdio_dev *sdev)
 355 {
 356         struct stdio_dev *dev;
 357         struct usb_device *usb_kbd_dev;
 358         struct usb_kbd_pdata *data;
 359
 360 #ifdef CONFIG_CMD_NET
 361         /*
 362          * If net_busy_flag is 1, NET transfer is running,
 363          * then we check key-pressed every second (first check may be
 364          * less than 1 second) to improve TFTP booting performance.
 365          */
 366         if (net_busy_flag && (get_timer(kbd_testc_tms) < CONFIG_SYS_HZ))
 367                 return 0;
 368         kbd_testc_tms = get_timer(0);
 369 #endif
 370         dev = stdio_get_by_name(DEVNAME);
 371         usb_kbd_dev = (struct usb_device *)dev->priv;
 372         data = usb_kbd_dev->privptr;
 373
 374         usb_kbd_poll_for_event(usb_kbd_dev);
 375
 376         return !(data->usb_in_pointer == data->usb_out_pointer);
 377 }
 378
 379 /* gets the character from the queue */
 380 static int usb_kbd_getc(struct stdio_dev *sdev)
 381 {
 382         struct stdio_dev *dev;
 383         struct usb_device *usb_kbd_dev;
 384         struct usb_kbd_pdata *data;
 385
 386         dev = stdio_get_by_name(DEVNAME);
 387         usb_kbd_dev = (struct usb_device *)dev->priv;
 388         data = usb_kbd_dev->privptr;
 389
 390         while (data->usb_in_pointer == data->usb_out_pointer)
 391                 usb_kbd_poll_for_event(usb_kbd_dev);
 392
 393         if (data->usb_out_pointer == USB_KBD_BUFFER_LEN - 1)
 394                 data->usb_out_pointer = 0;
 395         else
 396                 data->usb_out_pointer++;
 397
 398         return data->usb_kbd_buffer[data->usb_out_pointer];
 399 }
 400
 401 /* probes the USB device dev for keyboard type. */
 402 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
 403 {
 404         struct usb_interface *iface;
 405         struct usb_endpoint_descriptor *ep;
 406         struct usb_kbd_pdata *data;
 407
 408         if (dev->descriptor.bNumConfigurations != 1)
 409                 return 0;
 410
 411         iface = &dev->config.if_desc[ifnum];
 412
 413         if (iface->desc.bInterfaceClass != 3)
 414                 return 0;
 415
 416         if (iface->desc.bInterfaceSubClass != 1)
 417                 return 0;
 418
 419         if (iface->desc.bInterfaceProtocol != 1)
 420                 return 0;
 421
 422         if (iface->desc.bNumEndpoints != 1)
 423                 return 0;
 424
 425         ep = &iface->ep_desc[0];
 426
 427         /* Check if endpoint 1 is interrupt endpoint */
 428         if (!(ep->bEndpointAddress & 0x80))
 429                 return 0;
 430
 431         if ((ep->bmAttributes & 3) != 3)
 432                 return 0;
 433
 434         debug("USB KBD: found set protocol...\n");
 435
 436         data = malloc(sizeof(struct usb_kbd_pdata));
 437         if (!data) {
 438                 printf("USB KBD: Error allocating private data\n");
 439                 return 0;
 440         }
 441
 442         /* Clear private data */
 443         memset(data, 0, sizeof(struct usb_kbd_pdata));
 444
 445         /* allocate input buffer aligned and sized to USB DMA alignment */
 446         data->new = memalign(USB_DMA_MINALIGN,
 447                 roundup(USB_KBD_BOOT_REPORT_SIZE, USB_DMA_MINALIGN));
 448
 449         /* Insert private data into USB device structure */
 450         dev->privptr = data;
 451
 452         /* Set IRQ handler */
 453         dev->irq_handle = usb_kbd_irq;
 454
 455         data->intpipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
 456         data->intpktsize = min(usb_maxpacket(dev, data->intpipe),
 457                                USB_KBD_BOOT_REPORT_SIZE);
 458         data->intinterval = ep->bInterval;
 459         data->last_report = -1;
 460
 461         /* We found a USB Keyboard, install it. */
 462         usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
 463
 464         debug("USB KBD: found set idle...\n");
 465 #if !defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) && \
 466     !defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
 467         usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE / 4, 0);
 468 #else
 469         usb_set_idle(dev, iface->desc.bInterfaceNumber, 0, 0);
 470 #endif
 471
 472         debug("USB KBD: enable interrupt pipe...\n");
 473 #ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
 474         data->intq = create_int_queue(dev, data->intpipe, 1,
 475                                       USB_KBD_BOOT_REPORT_SIZE, data->new,
 476                                       data->intinterval);
 477         if (!data->intq) {
 478 #else
 479         if (usb_submit_int_msg(dev, data->intpipe, data->new, data->intpktsize,
 480                                data->intinterval) < 0) {
 481 #endif
 482                 printf("Failed to get keyboard state from device %04x:%04x\n",
 483                        dev->descriptor.idVendor, dev->descriptor.idProduct);
 484                 /* Abort, we don't want to use that non-functional keyboard. */
 485                 return 0;
 486         }
 487
 488         /* Success. */
 489         return 1;
 490 }
 491
 492 static int probe_usb_keyboard(struct usb_device *dev)
 493 {
 494         char *stdinname;
 495         struct stdio_dev usb_kbd_dev;
 496         int error;
 497
 498         /* Try probing the keyboard */
 499         if (usb_kbd_probe(dev, 0) != 1)
 500                 return -ENOENT;
 501
 502         /* Register the keyboard */
 503         debug("USB KBD: register.\n");
 504         memset(&usb_kbd_dev, 0, sizeof(struct stdio_dev));
 505         strcpy(usb_kbd_dev.name, DEVNAME);
 506         usb_kbd_dev.flags =  DEV_FLAGS_INPUT;
 507         usb_kbd_dev.getc = usb_kbd_getc;
 508         usb_kbd_dev.tstc = usb_kbd_testc;
 509         usb_kbd_dev.priv = (void *)dev;
 510         error = stdio_register(&usb_kbd_dev);
 511         if (error)
 512                 return error;
 513
 514         stdinname = getenv("stdin");
 515 #ifdef CONFIG_CONSOLE_MUX
 516         error = iomux_doenv(stdin, stdinname);
 517         if (error)
 518                 return error;
 519 #else
 520         /* Check if this is the standard input device. */
 521         if (strcmp(stdinname, DEVNAME))
 522                 return 1;
 523
 524         /* Reassign the console */
 525         if (overwrite_console())
 526                 return 1;
 527
 528         error = console_assign(stdin, DEVNAME);
 529         if (error)
 530                 return error;
 531 #endif
 532
 533         return 0;
 534 }
 535
 536 /* Search for keyboard and register it if found. */
 537 int drv_usb_kbd_init(void)
 538 {
 539         int error, i;
 540
 541         debug("%s: Probing for keyboard\n", __func__);
 542 #ifdef CONFIG_DM_USB
 543         /*
 544          * TODO: We should add U_BOOT_USB_DEVICE() declarations to each USB
 545          * keyboard driver and then most of this file can be removed.
 546          */
 547         struct udevice *bus;
 548         struct uclass *uc;
 549         int ret;
 550
 551         ret = uclass_get(UCLASS_USB, &uc);
 552         if (ret)
 553                 return ret;
 554         uclass_foreach_dev(bus, uc) {
 555                 for (i = 0; i < USB_MAX_DEVICE; i++) {
 556                         struct usb_device *dev;
 557
 558                         dev = usb_get_dev_index(bus, i); /* get device */
 559                         debug("i=%d, %p\n", i, dev);
 560                         if (!dev)
 561                                 break; /* no more devices available */
 562
 563                         error = probe_usb_keyboard(dev);
 564                         if (!error)
 565                                 return 1;
 566                         if (error && error != -ENOENT)
 567                                 return error;
 568                 } /* for */
 569         }
 570 #else
 571         /* Scan all USB Devices */
 572         for (i = 0; i < USB_MAX_DEVICE; i++) {
 573                 struct usb_device *dev;
 574
 575                 /* Get USB device. */
 576                 dev = usb_get_dev_index(i);
 577                 if (!dev)
 578                         break;
 579
 580                 if (dev->devnum == -1)
 581                         continue;
 582
 583                 error = probe_usb_keyboard(dev);
 584                 if (!error)
 585                         return 1;
 586                 if (error && error != -ENOENT)
 587                         return error;
 588         }
 589 #endif
 590
 591         /* No USB Keyboard found */
 592         return -1;
 593 }
 594
 595 /* Deregister the keyboard. */
 596 int usb_kbd_deregister(int force)
 597 {
 598 #ifdef CONFIG_SYS_STDIO_DEREGISTER
 599         struct stdio_dev *dev;
 600         struct usb_device *usb_kbd_dev;
 601         struct usb_kbd_pdata *data;
 602
 603         dev = stdio_get_by_name(DEVNAME);
 604         if (dev) {
 605                 usb_kbd_dev = (struct usb_device *)dev->priv;
 606                 data = usb_kbd_dev->privptr;
 607                 if (stdio_deregister_dev(dev, force) != 0)
 608                         return 1;
 609 #ifdef CONFIG_CONSOLE_MUX
 610                 if (iomux_doenv(stdin, getenv("stdin")) != 0)
 611                         return 1;
 612 #endif
 613 #ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
 614                 destroy_int_queue(usb_kbd_dev, data->intq);
 615 #endif
 616                 free(data->new);
 617                 free(data);
 618         }
 619
 620         return 0;
 621 #else
 622         return 1;
 623 #endif
 624 }