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