board/liebherr/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  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 /* define DEBUG for debugging output (obviously ;-)) */
  13 #if 0
  14 #define DEBUG
  15 #endif
  16
  17 #include <common.h>
  18 #include <i2c.h>
  19 #include <command.h>
  20 #include <console.h>
  21 #include <post.h>
  22 #include <serial.h>
  23 #include <malloc.h>
  24
  25 #include <linux/types.h>
  26 #include <linux/string.h>       /* for strdup */
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 static void kbd_init (void);
  31 static int compare_magic (uchar *kbd_data, uchar *str);
  32
  33 /*--------------------- Local macros and constants --------------------*/
  34 #define _NOT_USED_      0xFFFFFFFF
  35
  36 /*------------------------- dspic io expander -----------------------*/
  37 #define DSPIC_PON_STATUS_REG    0x80A
  38 #define DSPIC_PON_INV_STATUS_REG 0x80C
  39 #define DSPIC_PON_KEY_REG       0x810
  40 /*------------------------- Keyboard controller -----------------------*/
  41 /* command codes */
  42 #define KEYBD_CMD_READ_KEYS     0x01
  43 #define KEYBD_CMD_READ_VERSION  0x02
  44 #define KEYBD_CMD_READ_STATUS   0x03
  45 #define KEYBD_CMD_RESET_ERRORS  0x10
  46
  47 /* status codes */
  48 #define KEYBD_STATUS_MASK       0x3F
  49 #define KEYBD_STATUS_H_RESET    0x20
  50 #define KEYBD_STATUS_BROWNOUT   0x10
  51 #define KEYBD_STATUS_WD_RESET   0x08
  52 #define KEYBD_STATUS_OVERLOAD   0x04
  53 #define KEYBD_STATUS_ILLEGAL_WR 0x02
  54 #define KEYBD_STATUS_ILLEGAL_RD 0x01
  55
  56 /* Number of bytes returned from Keyboard Controller */
  57 #define KEYBD_VERSIONLEN        2       /* version information */
  58
  59 /*
  60  * This is different from the "old" lwmon dsPIC kbd controller
  61  * implementation. Now the controller still answers with 9 bytes,
  62  * but the last 3 bytes are always "0x06 0x07 0x08". So we just
  63  * set the length to compare to 6 instead of 9.
  64  */
  65 #define KEYBD_DATALEN           6       /* normal key scan data */
  66
  67 /* maximum number of "magic" key codes that can be assigned */
  68
  69 static uchar kbd_addr = CONFIG_SYS_I2C_KEYBD_ADDR;
  70 static uchar dspic_addr = CONFIG_SYS_I2C_DSPIC_IO_ADDR;
  71
  72 static uchar *key_match (uchar *);
  73
  74 #define KEYBD_SET_DEBUGMODE     '#'     /* Magic key to enable debug output */
  75
  76 /***********************************************************************
  77 F* Function:     int board_postclk_init (void) P*A*Z*
  78  *
  79 P* Parameters:   none
  80 P*
  81 P* Returnvalue:  int
  82 P*                - 0 is always returned.
  83  *
  84 Z* Intention:    This function is the board_postclk_init() method implementation
  85 Z*               for the lwmon board.
  86  *
  87  ***********************************************************************/
  88 int board_postclk_init (void)
  89 {
  90         kbd_init();
  91
  92         return (0);
  93 }
  94
  95 static void kbd_init (void)
  96 {
  97         uchar kbd_data[KEYBD_DATALEN];
  98         uchar tmp_data[KEYBD_DATALEN];
  99         uchar val, errcd;
 100         int i;
 101
 102         i2c_set_bus_num(0);
 103
 104         gd->arch.kbd_status = 0;
 105
 106         /* Forced by PIC. Delays <= 175us loose */
 107         udelay(1000);
 108
 109         /* Read initial keyboard error code */
 110         val = KEYBD_CMD_READ_STATUS;
 111         i2c_write (kbd_addr, 0, 0, &val, 1);
 112         i2c_read (kbd_addr, 0, 0, &errcd, 1);
 113         /* clear unused bits */
 114         errcd &= KEYBD_STATUS_MASK;
 115         /* clear "irrelevant" bits. Recommended by Martin Rajek, LWN */
 116         errcd &= ~(KEYBD_STATUS_H_RESET|KEYBD_STATUS_BROWNOUT);
 117         if (errcd) {
 118                 gd->arch.kbd_status |= errcd << 8;
 119         }
 120         /* Reset error code and verify */
 121         val = KEYBD_CMD_RESET_ERRORS;
 122         i2c_write (kbd_addr, 0, 0, &val, 1);
 123         udelay(1000);   /* delay NEEDED by keyboard PIC !!! */
 124
 125         val = KEYBD_CMD_READ_STATUS;
 126         i2c_write (kbd_addr, 0, 0, &val, 1);
 127         i2c_read (kbd_addr, 0, 0, &val, 1);
 128
 129         val &= KEYBD_STATUS_MASK;       /* clear unused bits */
 130         if (val) {                      /* permanent error, report it */
 131                 gd->arch.kbd_status |= val;
 132                 return;
 133         }
 134
 135         /*
 136          * Read current keyboard state.
 137          *
 138          * After the error reset it may take some time before the
 139          * keyboard PIC picks up a valid keyboard scan - the total
 140          * scan time is approx. 1.6 ms (information by Martin Rajek,
 141          * 28 Sep 2002). We read a couple of times for the keyboard
 142          * to stabilize, using a big enough delay.
 143          * 10 times should be enough. If the data is still changing,
 144          * we use what we get :-(
 145          */
 146
 147         memset (tmp_data, 0xFF, KEYBD_DATALEN); /* impossible value */
 148         for (i=0; i<10; ++i) {
 149                 val = KEYBD_CMD_READ_KEYS;
 150                 i2c_write (kbd_addr, 0, 0, &val, 1);
 151                 i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
 152
 153                 if (memcmp(kbd_data, tmp_data, KEYBD_DATALEN) == 0) {
 154                         /* consistent state, done */
 155                         break;
 156                 }
 157                 /* remeber last state, delay, and retry */
 158                 memcpy (tmp_data, kbd_data, KEYBD_DATALEN);
 159                 udelay (5000);
 160         }
 161 }
 162
 163
 164 /* Read a register from the dsPIC. */
 165 int _dspic_read(ushort reg, ushort *data)
 166 {
 167         uchar buf[sizeof(*data)];
 168         int rval;
 169
 170         if (i2c_read(dspic_addr, reg, 2, buf, 2))
 171                 return -1;
 172
 173         rval = i2c_read(dspic_addr, reg, sizeof(reg), buf, sizeof(*data));
 174         *data = (buf[0] << 8) | buf[1];
 175
 176         return rval;
 177 }
 178
 179
 180 /***********************************************************************
 181 F* Function:     int misc_init_r (void) P*A*Z*
 182  *
 183 P* Parameters:   none
 184 P*
 185 P* Returnvalue:  int
 186 P*                - 0 is always returned, even in the case of a keyboard
 187 P*                    error.
 188  *
 189 Z* Intention:    This function is the misc_init_r() method implementation
 190 Z*               for the lwmon board.
 191 Z*               The keyboard controller is initialized and the result
 192 Z*               of a read copied to the environment variable "keybd".
 193 Z*               If KEYBD_SET_DEBUGMODE is defined, a check is made for
 194 Z*               this key, and if found display to the LCD will be enabled.
 195 Z*               The keys in "keybd" are checked against the magic
 196 Z*               keycommands defined in the environment.
 197 Z*               See also key_match().
 198  *
 199 D* Design:       wd@denx.de
 200 C* Coding:       wd@denx.de
 201 V* Verification: dzu@denx.de
 202  ***********************************************************************/
 203 int misc_init_r_kbd (void)
 204 {
 205         uchar kbd_data[KEYBD_DATALEN];
 206         char keybd_env[2 * KEYBD_DATALEN + 1];
 207         uchar kbd_init_status = gd->arch.kbd_status >> 8;
 208         uchar kbd_status = gd->arch.kbd_status;
 209         uchar val;
 210         ushort data, inv_data;
 211         char *str;
 212         int i;
 213
 214         if (kbd_init_status) {
 215                 printf ("KEYBD: Error %02X\n", kbd_init_status);
 216         }
 217         if (kbd_status) {               /* permanent error, report it */
 218                 printf ("*** Keyboard error code %02X ***\n", kbd_status);
 219                 sprintf (keybd_env, "%02X", kbd_status);
 220                 setenv ("keybd", keybd_env);
 221                 return 0;
 222         }
 223
 224         /*
 225          * Now we know that we have a working  keyboard,  so  disable
 226          * all output to the LCD except when a key press is detected.
 227          */
 228
 229         if ((console_assign (stdout, "serial") < 0) ||
 230                 (console_assign (stderr, "serial") < 0)) {
 231                 printf ("Can't assign serial port as output device\n");
 232         }
 233
 234         /* Read Version */
 235         val = KEYBD_CMD_READ_VERSION;
 236         i2c_write (kbd_addr, 0, 0, &val, 1);
 237         i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_VERSIONLEN);
 238         printf ("KEYBD: Version %d.%d\n", kbd_data[0], kbd_data[1]);
 239
 240         /* Read current keyboard state */
 241         val = KEYBD_CMD_READ_KEYS;
 242         i2c_write (kbd_addr, 0, 0, &val, 1);
 243         i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
 244
 245         /* read out start key from bse01 received via can */
 246         _dspic_read(DSPIC_PON_STATUS_REG, &data);
 247         /* check highbyte from status register */
 248         if (data > 0xFF) {
 249                 _dspic_read(DSPIC_PON_INV_STATUS_REG, &inv_data);
 250
 251                 /* check inverse data */
 252                 if ((data+inv_data) == 0xFFFF) {
 253                         /* don't overwrite local key */
 254                         if (kbd_data[1] == 0) {
 255                                 /* read key value */
 256                                 _dspic_read(DSPIC_PON_KEY_REG, &data);
 257                                 str = (char *)&data;
 258                                 /* swap bytes */
 259                                 kbd_data[1] = str[1];
 260                                 kbd_data[2] = str[0];
 261                                 printf("CAN received startkey: 0x%X\n", data);
 262                         }
 263                 }
 264         }
 265
 266         for (i = 0; i < KEYBD_DATALEN; ++i) {
 267                 sprintf (keybd_env + i + i, "%02X", kbd_data[i]);
 268         }
 269
 270         setenv ("keybd", keybd_env);
 271
 272         str = strdup ((char *)key_match (kbd_data));    /* decode keys */
 273 #ifdef KEYBD_SET_DEBUGMODE
 274         if (kbd_data[0] == KEYBD_SET_DEBUGMODE) {       /* set debug mode */
 275                 if ((console_assign (stdout, "lcd") < 0) ||
 276                         (console_assign (stderr, "lcd") < 0)) {
 277                         printf ("Can't assign LCD display as output device\n");
 278                 }
 279         }
 280 #endif /* KEYBD_SET_DEBUGMODE */
 281 #ifdef CONFIG_PREBOOT   /* automatically configure "preboot" command on key match */
 282         setenv ("preboot", str);        /* set or delete definition */
 283 #endif /* CONFIG_PREBOOT */
 284         if (str != NULL) {
 285                 free (str);
 286         }
 287         return (0);
 288 }
 289
 290 #ifdef CONFIG_PREBOOT
 291
 292 static uchar kbd_magic_prefix[] = "key_magic";
 293 static uchar kbd_command_prefix[] = "key_cmd";
 294
 295 static int compare_magic (uchar *kbd_data, uchar *str)
 296 {
 297         uchar compare[KEYBD_DATALEN-1];
 298         char *nxt;
 299         int i;
 300
 301         /* Don't include modifier byte */
 302         memcpy (compare, kbd_data+1, KEYBD_DATALEN-1);
 303
 304         for (; str != NULL; str = (*nxt) ? (uchar *)(nxt+1) : (uchar *)nxt) {
 305                 uchar c;
 306                 int k;
 307
 308                 c = (uchar) simple_strtoul ((char *)str, (char **) (&nxt), 16);
 309
 310                 if (str == (uchar *)nxt) {      /* invalid character */
 311                         break;
 312                 }
 313
 314                 /*
 315                  * Check if this key matches the input.
 316                  * Set matches to zero, so they match only once
 317                  * and we can find duplicates or extra keys
 318                  */
 319                 for (k = 0; k < sizeof(compare); ++k) {
 320                         if (compare[k] == '\0') /* only non-zero entries */
 321                                 continue;
 322                         if (c == compare[k]) {  /* found matching key */
 323                                 compare[k] = '\0';
 324                                 break;
 325                         }
 326                 }
 327                 if (k == sizeof(compare)) {
 328                         return -1;              /* unmatched key */
 329                 }
 330         }
 331
 332         /*
 333          * A full match leaves no keys in the `compare' array,
 334          */
 335         for (i = 0; i < sizeof(compare); ++i) {
 336                 if (compare[i])
 337                 {
 338                         return -1;
 339                 }
 340         }
 341
 342         return 0;
 343 }
 344
 345 /***********************************************************************
 346 F* Function:     static uchar *key_match (uchar *kbd_data) P*A*Z*
 347  *
 348 P* Parameters:   uchar *kbd_data
 349 P*                - The keys to match against our magic definitions
 350 P*
 351 P* Returnvalue:  uchar *
 352 P*                - != NULL: Pointer to the corresponding command(s)
 353 P*                     NULL: No magic is about to happen
 354  *
 355 Z* Intention:    Check if pressed key(s) match magic sequence,
 356 Z*               and return the command string associated with that key(s).
 357 Z*
 358 Z*               If no key press was decoded, NULL is returned.
 359 Z*
 360 Z*               Note: the first character of the argument will be
 361 Z*                     overwritten with the "magic charcter code" of the
 362 Z*                     decoded key(s), or '\0'.
 363 Z*
 364 Z*               Note: the string points to static environment data
 365 Z*                     and must be saved before you call any function that
 366 Z*                     modifies the environment.
 367  *
 368 D* Design:       wd@denx.de
 369 C* Coding:       wd@denx.de
 370 V* Verification: dzu@denx.de
 371  ***********************************************************************/
 372 static uchar *key_match (uchar *kbd_data)
 373 {
 374         char magic[sizeof (kbd_magic_prefix) + 1];
 375         uchar *suffix;
 376         char *kbd_magic_keys;
 377
 378         /*
 379          * The following string defines the characters that can pe appended
 380          * to "key_magic" to form the names of environment variables that
 381          * hold "magic" key codes, i. e. such key codes that can cause
 382          * pre-boot actions. If the string is empty (""), then only
 383          * "key_magic" is checked (old behaviour); the string "125" causes
 384          * checks for "key_magic1", "key_magic2" and "key_magic5", etc.
 385          */
 386         if ((kbd_magic_keys = getenv ("magic_keys")) == NULL)
 387                 kbd_magic_keys = "";
 388
 389         /* loop over all magic keys;
 390          * use '\0' suffix in case of empty string
 391          */
 392         for (suffix=(uchar *)kbd_magic_keys; *suffix || suffix==(uchar *)kbd_magic_keys; ++suffix) {
 393                 sprintf (magic, "%s%c", kbd_magic_prefix, *suffix);
 394                 debug ("### Check magic \"%s\"\n", magic);
 395                 if (compare_magic(kbd_data, (uchar *)getenv(magic)) == 0) {
 396                         char cmd_name[sizeof (kbd_command_prefix) + 1];
 397                         char *cmd;
 398
 399                         sprintf (cmd_name, "%s%c", kbd_command_prefix, *suffix);
 400
 401                         cmd = getenv (cmd_name);
 402                         debug ("### Set PREBOOT to $(%s): \"%s\"\n",
 403                                         cmd_name, cmd ? cmd : "<<NULL>>");
 404                         *kbd_data = *suffix;
 405                         return ((uchar *)cmd);
 406                 }
 407         }
 408         debug ("### Delete PREBOOT\n");
 409         *kbd_data = '\0';
 410         return (NULL);
 411 }
 412 #endif /* CONFIG_PREBOOT */
 413
 414 /***********************************************************************
 415 F* Function:     int do_kbd (cmd_tbl_t *cmdtp, int flag,
 416 F*                           int argc, char * const argv[]) P*A*Z*
 417  *
 418 P* Parameters:   cmd_tbl_t *cmdtp
 419 P*                - Pointer to our command table entry
 420 P*               int flag
 421 P*                - If the CMD_FLAG_REPEAT bit is set, then this call is
 422 P*                  a repetition
 423 P*               int argc
 424 P*                - Argument count
 425 P*               char * const argv[]
 426 P*                - Array of the actual arguments
 427 P*
 428 P* Returnvalue:  int
 429 P*                - 0 is always returned.
 430  *
 431 Z* Intention:    Implement the "kbd" command.
 432 Z*               The keyboard status is read.  The result is printed on
 433 Z*               the console and written into the "keybd" environment
 434 Z*               variable.
 435  *
 436 D* Design:       wd@denx.de
 437 C* Coding:       wd@denx.de
 438 V* Verification: dzu@denx.de
 439  ***********************************************************************/
 440 int do_kbd (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 441 {
 442         uchar kbd_data[KEYBD_DATALEN];
 443         char keybd_env[2 * KEYBD_DATALEN + 1];
 444         uchar val;
 445         int i;
 446
 447 #if 0 /* Done in kbd_init */
 448         i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 449 #endif
 450
 451         /* Read keys */
 452         val = KEYBD_CMD_READ_KEYS;
 453         i2c_write (kbd_addr, 0, 0, &val, 1);
 454         i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
 455
 456         puts ("Keys:");
 457         for (i = 0; i < KEYBD_DATALEN; ++i) {
 458                 sprintf (keybd_env + i + i, "%02X", kbd_data[i]);
 459                 printf (" %02x", kbd_data[i]);
 460         }
 461         putc ('\n');
 462         setenv ("keybd", keybd_env);
 463         return 0;
 464 }
 465
 466 U_BOOT_CMD(
 467         kbd,    1,      1,      do_kbd,
 468         "read keyboard status",
 469         ""
 470 );
 471
 472 /*----------------------------- Utilities -----------------------------*/
 473
 474 #ifdef CONFIG_POST
 475 /*
 476  * Returns 1 if keys pressed to start the power-on long-running tests
 477  * Called from board_init_f().
 478  */
 479 int post_hotkeys_pressed(void)
 480 {
 481         uchar kbd_data[KEYBD_DATALEN];
 482         uchar val;
 483
 484         /* Read keys */
 485         val = KEYBD_CMD_READ_KEYS;
 486         i2c_write (kbd_addr, 0, 0, &val, 1);
 487         i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
 488
 489         return (compare_magic(kbd_data, (uchar *)CONFIG_POST_KEY_MAGIC) == 0);
 490 }
 491 #endif