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  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  *
  26  */
  27 #include <common.h>
  28 #include <malloc.h>
  29 #include <stdio_dev.h>
  30 #include <asm/byteorder.h>
  31
  32 #include <usb.h>
  33
  34 #ifdef  USB_KBD_DEBUG
  35 #define USB_KBD_PRINTF(fmt, args...)    printf(fmt, ##args)
  36 #else
  37 #define USB_KBD_PRINTF(fmt, args...)
  38 #endif
  39
  40 /*
  41  * If overwrite_console returns 1, the stdin, stderr and stdout
  42  * are switched to the serial port, else the settings in the
  43  * environment are used
  44  */
  45 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
  46 extern int overwrite_console(void);
  47 #else
  48 int overwrite_console(void)
  49 {
  50         return 0;
  51 }
  52 #endif
  53
  54 /* Keyboard sampling rate */
  55 #define REPEAT_RATE     (40 / 4)        /* 40msec -> 25cps */
  56 #define REPEAT_DELAY    10              /* 10 x REPEAT_RATE = 400msec */
  57
  58 #define NUM_LOCK        0x53
  59 #define CAPS_LOCK       0x39
  60 #define SCROLL_LOCK     0x47
  61
  62 /* Modifier bits */
  63 #define LEFT_CNTR       (1 << 0)
  64 #define LEFT_SHIFT      (1 << 1)
  65 #define LEFT_ALT        (1 << 2)
  66 #define LEFT_GUI        (1 << 3)
  67 #define RIGHT_CNTR      (1 << 4)
  68 #define RIGHT_SHIFT     (1 << 5)
  69 #define RIGHT_ALT       (1 << 6)
  70 #define RIGHT_GUI       (1 << 7)
  71
  72 /* Size of the keyboard buffer */
  73 #define USB_KBD_BUFFER_LEN      0x20
  74
  75 /* Device name */
  76 #define DEVNAME                 "usbkbd"
  77
  78 /* Keyboard maps */
  79 static const unsigned char usb_kbd_numkey[] = {
  80         '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
  81         '\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
  82         '\\', '#', ';', '\'', '`', ',', '.', '/'
  83 };
  84 static const unsigned char usb_kbd_numkey_shifted[] = {
  85         '!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
  86         '\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
  87         '|', '~', ':', '"', '~', '<', '>', '?'
  88 };
  89
  90 static const unsigned char usb_kbd_num_keypad[] = {
  91         '/', '*', '-', '+', '\r',
  92         '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
  93         '.', 0, 0, 0, '='
  94 };
  95
  96 /*
  97  * map arrow keys to ^F/^B ^N/^P, can't really use the proper
  98  * ANSI sequence for arrow keys because the queuing code breaks
  99  * when a single keypress expands to 3 queue elements
 100  */
 101 static const unsigned char usb_kbd_arrow[] = {
 102         0x6, 0x2, 0xe, 0x10
 103 };
 104
 105 /*
 106  * NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
 107  *       order. See usb_kbd_setled() function!
 108  */
 109 #define USB_KBD_NUMLOCK         (1 << 0)
 110 #define USB_KBD_CAPSLOCK        (1 << 1)
 111 #define USB_KBD_SCROLLLOCK      (1 << 2)
 112 #define USB_KBD_CTRL            (1 << 3)
 113
 114 #define USB_KBD_LEDMASK         \
 115         (USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)
 116
 117 struct usb_kbd_pdata {
 118         uint32_t        repeat_delay;
 119
 120         uint32_t        usb_in_pointer;
 121         uint32_t        usb_out_pointer;
 122         uint8_t         usb_kbd_buffer[USB_KBD_BUFFER_LEN];
 123
 124         uint8_t         *new;
 125         uint8_t         old[8];
 126
 127         uint8_t         flags;
 128 };
 129
 130 /* Generic keyboard event polling. */
 131 void usb_kbd_generic_poll(void)
 132 {
 133         struct stdio_dev *dev;
 134         struct usb_device *usb_kbd_dev;
 135         struct usb_kbd_pdata *data;
 136         struct usb_interface *iface;
 137         struct usb_endpoint_descriptor *ep;
 138         int pipe;
 139         int maxp;
 140
 141         /* Get the pointer to USB Keyboard device pointer */
 142         dev = stdio_get_by_name(DEVNAME);
 143         usb_kbd_dev = (struct usb_device *)dev->priv;
 144         data = usb_kbd_dev->privptr;
 145         iface = &usb_kbd_dev->config.if_desc[0];
 146         ep = &iface->ep_desc[0];
 147         pipe = usb_rcvintpipe(usb_kbd_dev, ep->bEndpointAddress);
 148
 149         /* Submit a interrupt transfer request */
 150         maxp = usb_maxpacket(usb_kbd_dev, pipe);
 151         usb_submit_int_msg(usb_kbd_dev, pipe, data->new,
 152                         maxp > 8 ? 8 : maxp, ep->bInterval);
 153 }
 154
 155 /* Puts character in the queue and sets up the in and out pointer. */
 156 static void usb_kbd_put_queue(struct usb_kbd_pdata *data, char c)
 157 {
 158         if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
 159                 /* Check for buffer full. */
 160                 if (data->usb_out_pointer == 0)
 161                         return;
 162
 163                 data->usb_in_pointer = 0;
 164         } else {
 165                 /* Check for buffer full. */
 166                 if (data->usb_in_pointer == data->usb_out_pointer - 1)
 167                         return;
 168
 169                 data->usb_in_pointer++;
 170         }
 171
 172         data->usb_kbd_buffer[data->usb_in_pointer] = c;
 173 }
 174
 175 /*
 176  * Set the LEDs. Since this is used in the irq routine, the control job is
 177  * issued with a timeout of 0. This means, that the job is queued without
 178  * waiting for job completion.
 179  */
 180 static void usb_kbd_setled(struct usb_device *dev)
 181 {
 182         struct usb_interface *iface = &dev->config.if_desc[0];
 183         struct usb_kbd_pdata *data = dev->privptr;
 184         uint32_t leds = data->flags & USB_KBD_LEDMASK;
 185
 186         usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 187                 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 188                 0x200, iface->desc.bInterfaceNumber, (void *)&leds, 1, 0);
 189 }
 190
 191 #define CAPITAL_MASK    0x20
 192 /* Translate the scancode in ASCII */
 193 static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
 194                                 unsigned char modifier, int pressed)
 195 {
 196         uint8_t keycode = 0;
 197
 198         /* Key released */
 199         if (pressed == 0) {
 200                 data->repeat_delay = 0;
 201                 return 0;
 202         }
 203
 204         if (pressed == 2) {
 205                 data->repeat_delay++;
 206                 if (data->repeat_delay < REPEAT_DELAY)
 207                         return 0;
 208
 209                 data->repeat_delay = REPEAT_DELAY;
 210         }
 211
 212         /* Alphanumeric values */
 213         if ((scancode > 3) && (scancode <= 0x1d)) {
 214                 keycode = scancode - 4 + 'a';
 215
 216                 if (data->flags & USB_KBD_CAPSLOCK)
 217                         keycode &= ~CAPITAL_MASK;
 218
 219                 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
 220                         /* Handle CAPSLock + Shift pressed simultaneously */
 221                         if (keycode & CAPITAL_MASK)
 222                                 keycode &= ~CAPITAL_MASK;
 223                         else
 224                                 keycode |= CAPITAL_MASK;
 225                 }
 226         }
 227
 228         if ((scancode > 0x1d) && (scancode < 0x3a)) {
 229                 /* Shift pressed */
 230                 if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
 231                         keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
 232                 else
 233                         keycode = usb_kbd_numkey[scancode - 0x1e];
 234         }
 235
 236         /* Arrow keys */
 237         if ((scancode >= 0x4f) && (scancode <= 0x52))
 238                 keycode = usb_kbd_arrow[scancode - 0x4f];
 239
 240         /* Numeric keypad */
 241         if ((scancode >= 0x54) && (scancode <= 0x67))
 242                 keycode = usb_kbd_num_keypad[scancode - 0x54];
 243
 244         if (data->flags & USB_KBD_CTRL)
 245                 keycode = scancode - 0x3;
 246
 247         if (pressed == 1) {
 248                 if (scancode == NUM_LOCK) {
 249                         data->flags ^= USB_KBD_NUMLOCK;
 250                         return 1;
 251                 }
 252
 253                 if (scancode == CAPS_LOCK) {
 254                         data->flags ^= USB_KBD_CAPSLOCK;
 255                         return 1;
 256                 }
 257                 if (scancode == SCROLL_LOCK) {
 258                         data->flags ^= USB_KBD_SCROLLLOCK;
 259                         return 1;
 260                 }
 261         }
 262
 263         /* Report keycode if any */
 264         if (keycode) {
 265                 USB_KBD_PRINTF("%c", keycode);
 266                 usb_kbd_put_queue(data, keycode);
 267         }
 268
 269         return 0;
 270 }
 271
 272 static uint32_t usb_kbd_service_key(struct usb_device *dev, int i, int up)
 273 {
 274         uint32_t res = 0;
 275         struct usb_kbd_pdata *data = dev->privptr;
 276         uint8_t *new;
 277         uint8_t *old;
 278
 279         if (up) {
 280                 new = data->old;
 281                 old = data->new;
 282         } else {
 283                 new = data->new;
 284                 old = data->old;
 285         }
 286
 287         if ((old[i] > 3) && (memscan(new + 2, old[i], 6) == new + 8))
 288                 res |= usb_kbd_translate(data, old[i], data->new[0], up);
 289
 290         return res;
 291 }
 292
 293 /* Interrupt service routine */
 294 static int usb_kbd_irq_worker(struct usb_device *dev)
 295 {
 296         struct usb_kbd_pdata *data = dev->privptr;
 297         int i, res = 0;
 298
 299         /* No combo key pressed */
 300         if (data->new[0] == 0x00)
 301                 data->flags &= ~USB_KBD_CTRL;
 302         /* Left or Right Ctrl pressed */
 303         else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
 304                 data->flags |= USB_KBD_CTRL;
 305
 306         for (i = 2; i < 8; i++) {
 307                 res |= usb_kbd_service_key(dev, i, 0);
 308                 res |= usb_kbd_service_key(dev, i, 1);
 309         }
 310
 311         /* Key is still pressed */
 312         if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
 313                 res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);
 314
 315         if (res == 1)
 316                 usb_kbd_setled(dev);
 317
 318         memcpy(data->old, data->new, 8);
 319
 320         return 1;
 321 }
 322
 323 /* Keyboard interrupt handler */
 324 static int usb_kbd_irq(struct usb_device *dev)
 325 {
 326         if ((dev->irq_status != 0) || (dev->irq_act_len != 8)) {
 327                 USB_KBD_PRINTF("USB KBD: Error %lX, len %d\n",
 328                                 dev->irq_status, dev->irq_act_len);
 329                 return 1;
 330         }
 331
 332         return usb_kbd_irq_worker(dev);
 333 }
 334
 335 /* Interrupt polling */
 336 static inline void usb_kbd_poll_for_event(struct usb_device *dev)
 337 {
 338 #if     defined(CONFIG_SYS_USB_EVENT_POLL)
 339         struct usb_interface *iface;
 340         struct usb_endpoint_descriptor *ep;
 341         struct usb_kbd_pdata *data;
 342         int pipe;
 343         int maxp;
 344
 345         /* Get the pointer to USB Keyboard device pointer */
 346         data = dev->privptr;
 347         iface = &dev->config.if_desc[0];
 348         ep = &iface->ep_desc[0];
 349         pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
 350
 351         /* Submit a interrupt transfer request */
 352         maxp = usb_maxpacket(dev, pipe);
 353         usb_submit_int_msg(dev, pipe, &data->new[0],
 354                         maxp > 8 ? 8 : maxp, ep->bInterval);
 355
 356         usb_kbd_irq_worker(dev);
 357 #elif   defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
 358         struct usb_interface *iface;
 359         struct usb_kbd_pdata *data = dev->privptr;
 360         iface = &dev->config.if_desc[0];
 361         usb_get_report(dev, iface->desc.bInterfaceNumber,
 362                         1, 0, data->new, sizeof(data->new));
 363         if (memcmp(data->old, data->new, sizeof(data->new)))
 364                 usb_kbd_irq_worker(dev);
 365 #endif
 366 }
 367
 368 /* test if a character is in the queue */
 369 static int usb_kbd_testc(void)
 370 {
 371         struct stdio_dev *dev;
 372         struct usb_device *usb_kbd_dev;
 373         struct usb_kbd_pdata *data;
 374
 375         dev = stdio_get_by_name(DEVNAME);
 376         usb_kbd_dev = (struct usb_device *)dev->priv;
 377         data = usb_kbd_dev->privptr;
 378
 379         usb_kbd_poll_for_event(usb_kbd_dev);
 380
 381         return !(data->usb_in_pointer == data->usb_out_pointer);
 382 }
 383
 384 /* gets the character from the queue */
 385 static int usb_kbd_getc(void)
 386 {
 387         struct stdio_dev *dev;
 388         struct usb_device *usb_kbd_dev;
 389         struct usb_kbd_pdata *data;
 390
 391         dev = stdio_get_by_name(DEVNAME);
 392         usb_kbd_dev = (struct usb_device *)dev->priv;
 393         data = usb_kbd_dev->privptr;
 394
 395         while (data->usb_in_pointer == data->usb_out_pointer)
 396                 usb_kbd_poll_for_event(usb_kbd_dev);
 397
 398         if (data->usb_out_pointer == USB_KBD_BUFFER_LEN - 1)
 399                 data->usb_out_pointer = 0;
 400         else
 401                 data->usb_out_pointer++;
 402
 403         return data->usb_kbd_buffer[data->usb_out_pointer];
 404 }
 405
 406 /* probes the USB device dev for keyboard type. */
 407 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
 408 {
 409         struct usb_interface *iface;
 410         struct usb_endpoint_descriptor *ep;
 411         struct usb_kbd_pdata *data;
 412         int pipe, maxp;
 413
 414         if (dev->descriptor.bNumConfigurations != 1)
 415                 return 0;
 416
 417         iface = &dev->config.if_desc[ifnum];
 418
 419         if (iface->desc.bInterfaceClass != 3)
 420                 return 0;
 421
 422         if (iface->desc.bInterfaceSubClass != 1)
 423                 return 0;
 424
 425         if (iface->desc.bInterfaceProtocol != 1)
 426                 return 0;
 427
 428         if (iface->desc.bNumEndpoints != 1)
 429                 return 0;
 430
 431         ep = &iface->ep_desc[0];
 432
 433         /* Check if endpoint 1 is interrupt endpoint */
 434         if (!(ep->bEndpointAddress & 0x80))
 435                 return 0;
 436
 437         if ((ep->bmAttributes & 3) != 3)
 438                 return 0;
 439
 440         USB_KBD_PRINTF("USB KBD: found set protocol...\n");
 441
 442         data = malloc(sizeof(struct usb_kbd_pdata));
 443         if (!data) {
 444                 printf("USB KBD: Error allocating private data\n");
 445                 return 0;
 446         }
 447
 448         /* Clear private data */
 449         memset(data, 0, sizeof(struct usb_kbd_pdata));
 450
 451         /* allocate input buffer aligned and sized to USB DMA alignment */
 452         data->new = memalign(USB_DMA_MINALIGN, roundup(8, USB_DMA_MINALIGN));
 453
 454         /* Insert private data into USB device structure */
 455         dev->privptr = data;
 456
 457         /* Set IRQ handler */
 458         dev->irq_handle = usb_kbd_irq;
 459
 460         pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
 461         maxp = usb_maxpacket(dev, pipe);
 462
 463         /* We found a USB Keyboard, install it. */
 464         usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
 465
 466         USB_KBD_PRINTF("USB KBD: found set idle...\n");
 467         usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE, 0);
 468
 469         USB_KBD_PRINTF("USB KBD: enable interrupt pipe...\n");
 470         usb_submit_int_msg(dev, pipe, data->new, maxp > 8 ? 8 : maxp,
 471                                 ep->bInterval);
 472
 473         /* Success. */
 474         return 1;
 475 }
 476
 477 /* Search for keyboard and register it if found. */
 478 int drv_usb_kbd_init(void)
 479 {
 480         struct stdio_dev usb_kbd_dev, *old_dev;
 481         struct usb_device *dev;
 482         char *stdinname = getenv("stdin");
 483         int error, i;
 484
 485         /* Scan all USB Devices */
 486         for (i = 0; i < USB_MAX_DEVICE; i++) {
 487                 /* Get USB device. */
 488                 dev = usb_get_dev_index(i);
 489                 if (!dev)
 490                         return -1;
 491
 492                 if (dev->devnum == -1)
 493                         continue;
 494
 495                 /* Try probing the keyboard */
 496                 if (usb_kbd_probe(dev, 0) != 1)
 497                         continue;
 498
 499                 /* We found a keyboard, check if it is already registered. */
 500                 USB_KBD_PRINTF("USB KBD: found set up device.\n");
 501                 old_dev = stdio_get_by_name(DEVNAME);
 502                 if (old_dev) {
 503                         /* Already registered, just return ok. */
 504                         USB_KBD_PRINTF("USB KBD: is already registered.\n");
 505                         return 1;
 506                 }
 507
 508                 /* Register the keyboard */
 509                 USB_KBD_PRINTF("USB KBD: register.\n");
 510                 memset(&usb_kbd_dev, 0, sizeof(struct stdio_dev));
 511                 strcpy(usb_kbd_dev.name, DEVNAME);
 512                 usb_kbd_dev.flags =  DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 513                 usb_kbd_dev.putc = NULL;
 514                 usb_kbd_dev.puts = NULL;
 515                 usb_kbd_dev.getc = usb_kbd_getc;
 516                 usb_kbd_dev.tstc = usb_kbd_testc;
 517                 usb_kbd_dev.priv = (void *)dev;
 518                 error = stdio_register(&usb_kbd_dev);
 519                 if (error)
 520                         return error;
 521
 522 #ifdef CONFIG_CONSOLE_MUX
 523                 error = iomux_doenv(stdin, stdinname);
 524                 if (error)
 525                         return error;
 526 #else
 527                 /* Check if this is the standard input device. */
 528                 if (strcmp(stdinname, DEVNAME))
 529                         return 1;
 530
 531                 /* Reassign the console */
 532                 if (overwrite_console())
 533                         return 1;
 534
 535                 error = console_assign(stdin, DEVNAME);
 536                 if (error)
 537                         return error;
 538 #endif
 539
 540                 return 1;
 541         }
 542
 543         /* No USB Keyboard found */
 544         return -1;
 545 }
 546
 547 /* Deregister the keyboard. */
 548 int usb_kbd_deregister(void)
 549 {
 550 #ifdef CONFIG_SYS_STDIO_DEREGISTER
 551         return stdio_deregister(DEVNAME);
 552 #else
 553         return 1;
 554 #endif
 555 }