board/lwmon5/kbd.c

   1 /*
   2  * (C) Copyright 2007
   3  * Stefan Roese, DENX Software Engineering, sr@denx.de.
   4  *
   5  * (C) Copyright 2001, 2002
   6  * DENX Software Engineering
   7  * Wolfgang Denk, wd@denx.de
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 /* define DEBUG for debugging output (obviously ;-)) */
  26 #if 0
  27 #define DEBUG
  28 #endif
  29
  30 #include <common.h>
  31 #include <i2c.h>
  32 #include <command.h>
  33 #include <post.h>
  34 #include <serial.h>
  35 #include <malloc.h>
  36
  37 #include <linux/types.h>
  38 #include <linux/string.h>       /* for strdup */
  39
  40 DECLARE_GLOBAL_DATA_PTR;
  41
  42 static void kbd_init (void);
  43 static int compare_magic (uchar *kbd_data, uchar *str);
  44
  45 /*--------------------- Local macros and constants --------------------*/
  46 #define _NOT_USED_      0xFFFFFFFF
  47
  48 /*------------------------- dspic io expander -----------------------*/
  49 #define DSPIC_PON_STATUS_REG    0x80A
  50 #define DSPIC_PON_INV_STATUS_REG 0x80C
  51 #define DSPIC_PON_KEY_REG       0x810
  52 /*------------------------- Keyboard controller -----------------------*/
  53 /* command codes */
  54 #define KEYBD_CMD_READ_KEYS     0x01
  55 #define KEYBD_CMD_READ_VERSION  0x02
  56 #define KEYBD_CMD_READ_STATUS   0x03
  57 #define KEYBD_CMD_RESET_ERRORS  0x10
  58
  59 /* status codes */
  60 #define KEYBD_STATUS_MASK       0x3F
  61 #define KEYBD_STATUS_H_RESET    0x20
  62 #define KEYBD_STATUS_BROWNOUT   0x10
  63 #define KEYBD_STATUS_WD_RESET   0x08
  64 #define KEYBD_STATUS_OVERLOAD   0x04
  65 #define KEYBD_STATUS_ILLEGAL_WR 0x02
  66 #define KEYBD_STATUS_ILLEGAL_RD 0x01
  67
  68 /* Number of bytes returned from Keyboard Controller */
  69 #define KEYBD_VERSIONLEN        2       /* version information */
  70
  71 /*
  72  * This is different from the "old" lwmon dsPIC kbd controller
  73  * implementation. Now the controller still answers with 9 bytes,
  74  * but the last 3 bytes are always "0x06 0x07 0x08". So we just
  75  * set the length to compare to 6 instead of 9.
  76  */
  77 #define KEYBD_DATALEN           6       /* normal key scan data */
  78
  79 /* maximum number of "magic" key codes that can be assigned */
  80
  81 static uchar kbd_addr = CONFIG_SYS_I2C_KEYBD_ADDR;
  82 static uchar dspic_addr = CONFIG_SYS_I2C_DSPIC_IO_ADDR;
  83
  84 static uchar *key_match (uchar *);
  85
  86 #define KEYBD_SET_DEBUGMODE     '#'     /* Magic key to enable debug output */
  87
  88 /***********************************************************************
  89 F* Function:     int board_postclk_init (void) P*A*Z*
  90  *
  91 P* Parameters:   none
  92 P*
  93 P* Returnvalue:  int
  94 P*                - 0 is always returned.
  95  *
  96 Z* Intention:    This function is the board_postclk_init() method implementation
  97 Z*               for the lwmon board.
  98  *
  99  ***********************************************************************/
 100 int board_postclk_init (void)
 101 {
 102         kbd_init();
 103
 104         return (0);
 105 }
 106
 107 static void kbd_init (void)
 108 {
 109         uchar kbd_data[KEYBD_DATALEN];
 110         uchar tmp_data[KEYBD_DATALEN];
 111         uchar val, errcd;
 112         int i;
 113
 114         i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 115
 116         gd->kbd_status = 0;
 117
 118         /* Forced by PIC. Delays <= 175us loose */
 119         udelay(1000);
 120
 121         /* Read initial keyboard error code */
 122         val = KEYBD_CMD_READ_STATUS;
 123         i2c_write (kbd_addr, 0, 0, &val, 1);
 124         i2c_read (kbd_addr, 0, 0, &errcd, 1);
 125         /* clear unused bits */
 126         errcd &= KEYBD_STATUS_MASK;
 127         /* clear "irrelevant" bits. Recommended by Martin Rajek, LWN */
 128         errcd &= ~(KEYBD_STATUS_H_RESET|KEYBD_STATUS_BROWNOUT);
 129         if (errcd) {
 130                 gd->kbd_status |= errcd << 8;
 131         }
 132         /* Reset error code and verify */
 133         val = KEYBD_CMD_RESET_ERRORS;
 134         i2c_write (kbd_addr, 0, 0, &val, 1);
 135         udelay(1000);   /* delay NEEDED by keyboard PIC !!! */
 136
 137         val = KEYBD_CMD_READ_STATUS;
 138         i2c_write (kbd_addr, 0, 0, &val, 1);
 139         i2c_read (kbd_addr, 0, 0, &val, 1);
 140
 141         val &= KEYBD_STATUS_MASK;       /* clear unused bits */
 142         if (val) {                      /* permanent error, report it */
 143                 gd->kbd_status |= val;
 144                 return;
 145         }
 146
 147         /*
 148          * Read current keyboard state.
 149          *
 150          * After the error reset it may take some time before the
 151          * keyboard PIC picks up a valid keyboard scan - the total
 152          * scan time is approx. 1.6 ms (information by Martin Rajek,
 153          * 28 Sep 2002). We read a couple of times for the keyboard
 154          * to stabilize, using a big enough delay.
 155          * 10 times should be enough. If the data is still changing,
 156          * we use what we get :-(
 157          */
 158
 159         memset (tmp_data, 0xFF, KEYBD_DATALEN); /* impossible value */
 160         for (i=0; i<10; ++i) {
 161                 val = KEYBD_CMD_READ_KEYS;
 162                 i2c_write (kbd_addr, 0, 0, &val, 1);
 163                 i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
 164
 165                 if (memcmp(kbd_data, tmp_data, KEYBD_DATALEN) == 0) {
 166                         /* consistent state, done */
 167                         break;
 168                 }
 169                 /* remeber last state, delay, and retry */
 170                 memcpy (tmp_data, kbd_data, KEYBD_DATALEN);
 171                 udelay (5000);
 172         }
 173 }
 174
 175
 176 /* Read a register from the dsPIC. */
 177 int _dspic_read(ushort reg, ushort *data)
 178 {
 179         uchar buf[sizeof(*data)];
 180         int rval;
 181
 182         if (i2c_read(dspic_addr, reg, 2, buf, 2))
 183                 return -1;
 184
 185         rval = i2c_read(dspic_addr, reg, sizeof(reg), buf, sizeof(*data));
 186         *data = (buf[0] << 8) | buf[1];
 187
 188         return rval;
 189 }
 190
 191
 192 /***********************************************************************
 193 F* Function:     int misc_init_r (void) P*A*Z*
 194  *
 195 P* Parameters:   none
 196 P*
 197 P* Returnvalue:  int
 198 P*                - 0 is always returned, even in the case of a keyboard
 199 P*                    error.
 200  *
 201 Z* Intention:    This function is the misc_init_r() method implementation
 202 Z*               for the lwmon board.
 203 Z*               The keyboard controller is initialized and the result
 204 Z*               of a read copied to the environment variable "keybd".
 205 Z*               If KEYBD_SET_DEBUGMODE is defined, a check is made for
 206 Z*               this key, and if found display to the LCD will be enabled.
 207 Z*               The keys in "keybd" are checked against the magic
 208 Z*               keycommands defined in the environment.
 209 Z*               See also key_match().
 210  *
 211 D* Design:       wd@denx.de
 212 C* Coding:       wd@denx.de
 213 V* Verification: dzu@denx.de
 214  ***********************************************************************/
 215 int misc_init_r_kbd (void)
 216 {
 217         uchar kbd_data[KEYBD_DATALEN];
 218         char keybd_env[2 * KEYBD_DATALEN + 1];
 219         uchar kbd_init_status = gd->kbd_status >> 8;
 220         uchar kbd_status = gd->kbd_status;
 221         uchar val;
 222         ushort data, inv_data;
 223         char *str;
 224         int i;
 225
 226         if (kbd_init_status) {
 227                 printf ("KEYBD: Error %02X\n", kbd_init_status);
 228         }
 229         if (kbd_status) {               /* permanent error, report it */
 230                 printf ("*** Keyboard error code %02X ***\n", kbd_status);
 231                 sprintf (keybd_env, "%02X", kbd_status);
 232                 setenv ("keybd", keybd_env);
 233                 return 0;
 234         }
 235
 236         /*
 237          * Now we know that we have a working  keyboard,  so  disable
 238          * all output to the LCD except when a key press is detected.
 239          */
 240
 241         if ((console_assign (stdout, "serial") < 0) ||
 242                 (console_assign (stderr, "serial") < 0)) {
 243                 printf ("Can't assign serial port as output device\n");
 244         }
 245
 246         /* Read Version */
 247         val = KEYBD_CMD_READ_VERSION;
 248         i2c_write (kbd_addr, 0, 0, &val, 1);
 249         i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_VERSIONLEN);
 250         printf ("KEYBD: Version %d.%d\n", kbd_data[0], kbd_data[1]);
 251
 252         /* Read current keyboard state */
 253         val = KEYBD_CMD_READ_KEYS;
 254         i2c_write (kbd_addr, 0, 0, &val, 1);
 255         i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
 256
 257         /* read out start key from bse01 received via can */
 258         _dspic_read(DSPIC_PON_STATUS_REG, &data);
 259         /* check highbyte from status register */
 260         if (data > 0xFF) {
 261                 _dspic_read(DSPIC_PON_INV_STATUS_REG, &inv_data);
 262
 263                 /* check inverse data */
 264                 if ((data+inv_data) == 0xFFFF) {
 265                         /* don't overwrite local key */
 266                         if (kbd_data[1] == 0) {
 267                                 /* read key value */
 268                                 _dspic_read(DSPIC_PON_KEY_REG, &data);
 269                                 str = (char *)&data;
 270                                 /* swap bytes */
 271                                 kbd_data[1] = str[1];
 272                                 kbd_data[2] = str[0];
 273                                 printf("CAN received startkey: 0x%X\n", data);
 274                         }
 275                 }
 276         }
 277
 278         for (i = 0; i < KEYBD_DATALEN; ++i) {
 279                 sprintf (keybd_env + i + i, "%02X", kbd_data[i]);
 280         }
 281
 282         setenv ("keybd", keybd_env);
 283
 284         str = strdup ((char *)key_match (kbd_data));    /* decode keys */
 285 #ifdef KEYBD_SET_DEBUGMODE
 286         if (kbd_data[0] == KEYBD_SET_DEBUGMODE) {       /* set debug mode */
 287                 if ((console_assign (stdout, "lcd") < 0) ||
 288                         (console_assign (stderr, "lcd") < 0)) {
 289                         printf ("Can't assign LCD display as output device\n");
 290                 }
 291         }
 292 #endif /* KEYBD_SET_DEBUGMODE */
 293 #ifdef CONFIG_PREBOOT   /* automatically configure "preboot" command on key match */
 294         setenv ("preboot", str);        /* set or delete definition */
 295 #endif /* CONFIG_PREBOOT */
 296         if (str != NULL) {
 297                 free (str);
 298         }
 299         return (0);
 300 }
 301
 302 #ifdef CONFIG_PREBOOT
 303
 304 static uchar kbd_magic_prefix[] = "key_magic";
 305 static uchar kbd_command_prefix[] = "key_cmd";
 306
 307 static int compare_magic (uchar *kbd_data, uchar *str)
 308 {
 309         uchar compare[KEYBD_DATALEN-1];
 310         char *nxt;
 311         int i;
 312
 313         /* Don't include modifier byte */
 314         memcpy (compare, kbd_data+1, KEYBD_DATALEN-1);
 315
 316         for (; str != NULL; str = (*nxt) ? (uchar *)(nxt+1) : (uchar *)nxt) {
 317                 uchar c;
 318                 int k;
 319
 320                 c = (uchar) simple_strtoul ((char *)str, (char **) (&nxt), 16);
 321
 322                 if (str == (uchar *)nxt) {      /* invalid character */
 323                         break;
 324                 }
 325
 326                 /*
 327                  * Check if this key matches the input.
 328                  * Set matches to zero, so they match only once
 329                  * and we can find duplicates or extra keys
 330                  */
 331                 for (k = 0; k < sizeof(compare); ++k) {
 332                         if (compare[k] == '\0') /* only non-zero entries */
 333                                 continue;
 334                         if (c == compare[k]) {  /* found matching key */
 335                                 compare[k] = '\0';
 336                                 break;
 337                         }
 338                 }
 339                 if (k == sizeof(compare)) {
 340                         return -1;              /* unmatched key */
 341                 }
 342         }
 343
 344         /*
 345          * A full match leaves no keys in the `compare' array,
 346          */
 347         for (i = 0; i < sizeof(compare); ++i) {
 348                 if (compare[i])
 349                 {
 350                         return -1;
 351                 }
 352         }
 353
 354         return 0;
 355 }
 356
 357 /***********************************************************************
 358 F* Function:     static uchar *key_match (uchar *kbd_data) P*A*Z*
 359  *
 360 P* Parameters:   uchar *kbd_data
 361 P*                - The keys to match against our magic definitions
 362 P*
 363 P* Returnvalue:  uchar *
 364 P*                - != NULL: Pointer to the corresponding command(s)
 365 P*                     NULL: No magic is about to happen
 366  *
 367 Z* Intention:    Check if pressed key(s) match magic sequence,
 368 Z*               and return the command string associated with that key(s).
 369 Z*
 370 Z*               If no key press was decoded, NULL is returned.
 371 Z*
 372 Z*               Note: the first character of the argument will be
 373 Z*                     overwritten with the "magic charcter code" of the
 374 Z*                     decoded key(s), or '\0'.
 375 Z*
 376 Z*               Note: the string points to static environment data
 377 Z*                     and must be saved before you call any function that
 378 Z*                     modifies the environment.
 379  *
 380 D* Design:       wd@denx.de
 381 C* Coding:       wd@denx.de
 382 V* Verification: dzu@denx.de
 383  ***********************************************************************/
 384 static uchar *key_match (uchar *kbd_data)
 385 {
 386         char magic[sizeof (kbd_magic_prefix) + 1];
 387         uchar *suffix;
 388         char *kbd_magic_keys;
 389
 390         /*
 391          * The following string defines the characters that can pe appended
 392          * to "key_magic" to form the names of environment variables that
 393          * hold "magic" key codes, i. e. such key codes that can cause
 394          * pre-boot actions. If the string is empty (""), then only
 395          * "key_magic" is checked (old behaviour); the string "125" causes
 396          * checks for "key_magic1", "key_magic2" and "key_magic5", etc.
 397          */
 398         if ((kbd_magic_keys = getenv ("magic_keys")) == NULL)
 399                 kbd_magic_keys = "";
 400
 401         /* loop over all magic keys;
 402          * use '\0' suffix in case of empty string
 403          */
 404         for (suffix=(uchar *)kbd_magic_keys; *suffix || suffix==(uchar *)kbd_magic_keys; ++suffix) {
 405                 sprintf (magic, "%s%c", kbd_magic_prefix, *suffix);
 406                 debug ("### Check magic \"%s\"\n", magic);
 407                 if (compare_magic(kbd_data, (uchar *)getenv(magic)) == 0) {
 408                         char cmd_name[sizeof (kbd_command_prefix) + 1];
 409                         char *cmd;
 410
 411                         sprintf (cmd_name, "%s%c", kbd_command_prefix, *suffix);
 412
 413                         cmd = getenv (cmd_name);
 414                         debug ("### Set PREBOOT to $(%s): \"%s\"\n",
 415                                         cmd_name, cmd ? cmd : "<<NULL>>");
 416                         *kbd_data = *suffix;
 417                         return ((uchar *)cmd);
 418                 }
 419         }
 420         debug ("### Delete PREBOOT\n");
 421         *kbd_data = '\0';
 422         return (NULL);
 423 }
 424 #endif /* CONFIG_PREBOOT */
 425
 426 /***********************************************************************
 427 F* Function:     int do_kbd (cmd_tbl_t *cmdtp, int flag,
 428 F*                           int argc, char * const argv[]) P*A*Z*
 429  *
 430 P* Parameters:   cmd_tbl_t *cmdtp
 431 P*                - Pointer to our command table entry
 432 P*               int flag
 433 P*                - If the CMD_FLAG_REPEAT bit is set, then this call is
 434 P*                  a repetition
 435 P*               int argc
 436 P*                - Argument count
 437 P*               char * const argv[]
 438 P*                - Array of the actual arguments
 439 P*
 440 P* Returnvalue:  int
 441 P*                - 0 is always returned.
 442  *
 443 Z* Intention:    Implement the "kbd" command.
 444 Z*               The keyboard status is read.  The result is printed on
 445 Z*               the console and written into the "keybd" environment
 446 Z*               variable.
 447  *
 448 D* Design:       wd@denx.de
 449 C* Coding:       wd@denx.de
 450 V* Verification: dzu@denx.de
 451  ***********************************************************************/
 452 int do_kbd (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 453 {
 454         uchar kbd_data[KEYBD_DATALEN];
 455         char keybd_env[2 * KEYBD_DATALEN + 1];
 456         uchar val;
 457         int i;
 458
 459 #if 0 /* Done in kbd_init */
 460         i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 461 #endif
 462
 463         /* Read keys */
 464         val = KEYBD_CMD_READ_KEYS;
 465         i2c_write (kbd_addr, 0, 0, &val, 1);
 466         i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
 467
 468         puts ("Keys:");
 469         for (i = 0; i < KEYBD_DATALEN; ++i) {
 470                 sprintf (keybd_env + i + i, "%02X", kbd_data[i]);
 471                 printf (" %02x", kbd_data[i]);
 472         }
 473         putc ('\n');
 474         setenv ("keybd", keybd_env);
 475         return 0;
 476 }
 477
 478 U_BOOT_CMD(
 479         kbd,    1,      1,      do_kbd,
 480         "read keyboard status",
 481         ""
 482 );
 483
 484 /*----------------------------- Utilities -----------------------------*/
 485
 486 #ifdef CONFIG_POST
 487 /*
 488  * Returns 1 if keys pressed to start the power-on long-running tests
 489  * Called from board_init_f().
 490  */
 491 int post_hotkeys_pressed(void)
 492 {
 493         uchar kbd_data[KEYBD_DATALEN];
 494         uchar val;
 495
 496         /* Read keys */
 497         val = KEYBD_CMD_READ_KEYS;
 498         i2c_write (kbd_addr, 0, 0, &val, 1);
 499         i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
 500
 501         return (compare_magic(kbd_data, (uchar *)CONFIG_POST_KEY_MAGIC) == 0);
 502 }
 503 #endif