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