arch/powerpc/kernel/rtas-proc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *   Copyright (C) 2000 Tilmann Bitterberg
   4  *   (tilmann@bitterberg.de)
   5  *
   6  *   RTAS (Runtime Abstraction Services) stuff
   7  *   Intention is to provide a clean user interface
   8  *   to use the RTAS.
   9  *
  10  *   TODO:
  11  *   Split off a header file and maybe move it to a different
  12  *   location. Write Documentation on what the /proc/rtas/ entries
  13  *   actually do.
  14  */
  15
  16 #include <linux/errno.h>
  17 #include <linux/sched.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/stat.h>
  20 #include <linux/ctype.h>
  21 #include <linux/time.h>
  22 #include <linux/string.h>
  23 #include <linux/init.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/bitops.h>
  26 #include <linux/rtc.h>
  27 #include <linux/of.h>
  28
  29 #include <linux/uaccess.h>
  30 #include <asm/processor.h>
  31 #include <asm/io.h>
  32 #include <asm/rtas.h>
  33 #include <asm/machdep.h> /* for ppc_md */
  34 #include <asm/time.h>
  35
  36 /* Token for Sensors */
  37 #define KEY_SWITCH              0x0001
  38 #define ENCLOSURE_SWITCH        0x0002
  39 #define THERMAL_SENSOR          0x0003
  40 #define LID_STATUS              0x0004
  41 #define POWER_SOURCE            0x0005
  42 #define BATTERY_VOLTAGE         0x0006
  43 #define BATTERY_REMAINING       0x0007
  44 #define BATTERY_PERCENTAGE      0x0008
  45 #define EPOW_SENSOR             0x0009
  46 #define BATTERY_CYCLESTATE      0x000a
  47 #define BATTERY_CHARGING        0x000b
  48
  49 /* IBM specific sensors */
  50 #define IBM_SURVEILLANCE        0x2328 /* 9000 */
  51 #define IBM_FANRPM              0x2329 /* 9001 */
  52 #define IBM_VOLTAGE             0x232a /* 9002 */
  53 #define IBM_DRCONNECTOR         0x232b /* 9003 */
  54 #define IBM_POWERSUPPLY         0x232c /* 9004 */
  55
  56 /* Status return values */
  57 #define SENSOR_CRITICAL_HIGH    13
  58 #define SENSOR_WARNING_HIGH     12
  59 #define SENSOR_NORMAL           11
  60 #define SENSOR_WARNING_LOW      10
  61 #define SENSOR_CRITICAL_LOW      9
  62 #define SENSOR_SUCCESS           0
  63 #define SENSOR_HW_ERROR         -1
  64 #define SENSOR_BUSY             -2
  65 #define SENSOR_NOT_EXIST        -3
  66 #define SENSOR_DR_ENTITY        -9000
  67
  68 /* Location Codes */
  69 #define LOC_SCSI_DEV_ADDR       'A'
  70 #define LOC_SCSI_DEV_LOC        'B'
  71 #define LOC_CPU                 'C'
  72 #define LOC_DISKETTE            'D'
  73 #define LOC_ETHERNET            'E'
  74 #define LOC_FAN                 'F'
  75 #define LOC_GRAPHICS            'G'
  76 /* reserved / not used          'H' */
  77 #define LOC_IO_ADAPTER          'I'
  78 /* reserved / not used          'J' */
  79 #define LOC_KEYBOARD            'K'
  80 #define LOC_LCD                 'L'
  81 #define LOC_MEMORY              'M'
  82 #define LOC_NV_MEMORY           'N'
  83 #define LOC_MOUSE               'O'
  84 #define LOC_PLANAR              'P'
  85 #define LOC_OTHER_IO            'Q'
  86 #define LOC_PARALLEL            'R'
  87 #define LOC_SERIAL              'S'
  88 #define LOC_DEAD_RING           'T'
  89 #define LOC_RACKMOUNTED         'U' /* for _u_nit is rack mounted */
  90 #define LOC_VOLTAGE             'V'
  91 #define LOC_SWITCH_ADAPTER      'W'
  92 #define LOC_OTHER               'X'
  93 #define LOC_FIRMWARE            'Y'
  94 #define LOC_SCSI                'Z'
  95
  96 /* Tokens for indicators */
  97 #define TONE_FREQUENCY          0x0001 /* 0 - 1000 (HZ)*/
  98 #define TONE_VOLUME             0x0002 /* 0 - 100 (%) */
  99 #define SYSTEM_POWER_STATE      0x0003
 100 #define WARNING_LIGHT           0x0004
 101 #define DISK_ACTIVITY_LIGHT     0x0005
 102 #define HEX_DISPLAY_UNIT        0x0006
 103 #define BATTERY_WARNING_TIME    0x0007
 104 #define CONDITION_CYCLE_REQUEST 0x0008
 105 #define SURVEILLANCE_INDICATOR  0x2328 /* 9000 */
 106 #define DR_ACTION               0x2329 /* 9001 */
 107 #define DR_INDICATOR            0x232a /* 9002 */
 108 /* 9003 - 9004: Vendor specific */
 109 /* 9006 - 9999: Vendor specific */
 110
 111 /* other */
 112 #define MAX_SENSORS              17  /* I only know of 17 sensors */
 113 #define MAX_LINELENGTH          256
 114 #define SENSOR_PREFIX           "ibm,sensor-"
 115 #define cel_to_fahr(x)          ((x*9/5)+32)
 116
 117 struct individual_sensor {
 118         unsigned int token;
 119         unsigned int quant;
 120 };
 121
 122 struct rtas_sensors {
 123         struct individual_sensor sensor[MAX_SENSORS];
 124         unsigned int quant;
 125 };
 126
 127 /* Globals */
 128 static struct rtas_sensors sensors;
 129 static struct device_node *rtas_node = NULL;
 130 static unsigned long power_on_time = 0; /* Save the time the user set */
 131 static char progress_led[MAX_LINELENGTH];
 132
 133 static unsigned long rtas_tone_frequency = 1000;
 134 static unsigned long rtas_tone_volume = 0;
 135
 136 /* ****************************************************************** */
 137 /* Declarations */
 138 static int ppc_rtas_sensors_show(struct seq_file *m, void *v);
 139 static int ppc_rtas_clock_show(struct seq_file *m, void *v);
 140 static ssize_t ppc_rtas_clock_write(struct file *file,
 141                 const char __user *buf, size_t count, loff_t *ppos);
 142 static int ppc_rtas_progress_show(struct seq_file *m, void *v);
 143 static ssize_t ppc_rtas_progress_write(struct file *file,
 144                 const char __user *buf, size_t count, loff_t *ppos);
 145 static int ppc_rtas_poweron_show(struct seq_file *m, void *v);
 146 static ssize_t ppc_rtas_poweron_write(struct file *file,
 147                 const char __user *buf, size_t count, loff_t *ppos);
 148
 149 static ssize_t ppc_rtas_tone_freq_write(struct file *file,
 150                 const char __user *buf, size_t count, loff_t *ppos);
 151 static int ppc_rtas_tone_freq_show(struct seq_file *m, void *v);
 152 static ssize_t ppc_rtas_tone_volume_write(struct file *file,
 153                 const char __user *buf, size_t count, loff_t *ppos);
 154 static int ppc_rtas_tone_volume_show(struct seq_file *m, void *v);
 155 static int ppc_rtas_rmo_buf_show(struct seq_file *m, void *v);
 156
 157 static int poweron_open(struct inode *inode, struct file *file)
 158 {
 159         return single_open(file, ppc_rtas_poweron_show, NULL);
 160 }
 161
 162 static const struct proc_ops ppc_rtas_poweron_proc_ops = {
 163         .proc_open      = poweron_open,
 164         .proc_read      = seq_read,
 165         .proc_lseek     = seq_lseek,
 166         .proc_write     = ppc_rtas_poweron_write,
 167         .proc_release   = single_release,
 168 };
 169
 170 static int progress_open(struct inode *inode, struct file *file)
 171 {
 172         return single_open(file, ppc_rtas_progress_show, NULL);
 173 }
 174
 175 static const struct proc_ops ppc_rtas_progress_proc_ops = {
 176         .proc_open      = progress_open,
 177         .proc_read      = seq_read,
 178         .proc_lseek     = seq_lseek,
 179         .proc_write     = ppc_rtas_progress_write,
 180         .proc_release   = single_release,
 181 };
 182
 183 static int clock_open(struct inode *inode, struct file *file)
 184 {
 185         return single_open(file, ppc_rtas_clock_show, NULL);
 186 }
 187
 188 static const struct proc_ops ppc_rtas_clock_proc_ops = {
 189         .proc_open      = clock_open,
 190         .proc_read      = seq_read,
 191         .proc_lseek     = seq_lseek,
 192         .proc_write     = ppc_rtas_clock_write,
 193         .proc_release   = single_release,
 194 };
 195
 196 static int tone_freq_open(struct inode *inode, struct file *file)
 197 {
 198         return single_open(file, ppc_rtas_tone_freq_show, NULL);
 199 }
 200
 201 static const struct proc_ops ppc_rtas_tone_freq_proc_ops = {
 202         .proc_open      = tone_freq_open,
 203         .proc_read      = seq_read,
 204         .proc_lseek     = seq_lseek,
 205         .proc_write     = ppc_rtas_tone_freq_write,
 206         .proc_release   = single_release,
 207 };
 208
 209 static int tone_volume_open(struct inode *inode, struct file *file)
 210 {
 211         return single_open(file, ppc_rtas_tone_volume_show, NULL);
 212 }
 213
 214 static const struct proc_ops ppc_rtas_tone_volume_proc_ops = {
 215         .proc_open      = tone_volume_open,
 216         .proc_read      = seq_read,
 217         .proc_lseek     = seq_lseek,
 218         .proc_write     = ppc_rtas_tone_volume_write,
 219         .proc_release   = single_release,
 220 };
 221
 222 static int ppc_rtas_find_all_sensors(void);
 223 static void ppc_rtas_process_sensor(struct seq_file *m,
 224         struct individual_sensor *s, int state, int error, const char *loc);
 225 static char *ppc_rtas_process_error(int error);
 226 static void get_location_code(struct seq_file *m,
 227         struct individual_sensor *s, const char *loc);
 228 static void check_location_string(struct seq_file *m, const char *c);
 229 static void check_location(struct seq_file *m, const char *c);
 230
 231 static int __init proc_rtas_init(void)
 232 {
 233         if (!machine_is(pseries))
 234                 return -ENODEV;
 235
 236         rtas_node = of_find_node_by_name(NULL, "rtas");
 237         if (rtas_node == NULL)
 238                 return -ENODEV;
 239
 240         proc_create("powerpc/rtas/progress", 0644, NULL,
 241                     &ppc_rtas_progress_proc_ops);
 242         proc_create("powerpc/rtas/clock", 0644, NULL,
 243                     &ppc_rtas_clock_proc_ops);
 244         proc_create("powerpc/rtas/poweron", 0644, NULL,
 245                     &ppc_rtas_poweron_proc_ops);
 246         proc_create_single("powerpc/rtas/sensors", 0444, NULL,
 247                         ppc_rtas_sensors_show);
 248         proc_create("powerpc/rtas/frequency", 0644, NULL,
 249                     &ppc_rtas_tone_freq_proc_ops);
 250         proc_create("powerpc/rtas/volume", 0644, NULL,
 251                     &ppc_rtas_tone_volume_proc_ops);
 252         proc_create_single("powerpc/rtas/rmo_buffer", 0400, NULL,
 253                         ppc_rtas_rmo_buf_show);
 254         return 0;
 255 }
 256
 257 __initcall(proc_rtas_init);
 258
 259 static int parse_number(const char __user *p, size_t count, u64 *val)
 260 {
 261         char buf[40];
 262
 263         if (count > 39)
 264                 return -EINVAL;
 265
 266         if (copy_from_user(buf, p, count))
 267                 return -EFAULT;
 268
 269         buf[count] = 0;
 270
 271         return kstrtoull(buf, 10, val);
 272 }
 273
 274 /* ****************************************************************** */
 275 /* POWER-ON-TIME                                                      */
 276 /* ****************************************************************** */
 277 static ssize_t ppc_rtas_poweron_write(struct file *file,
 278                 const char __user *buf, size_t count, loff_t *ppos)
 279 {
 280         struct rtc_time tm;
 281         time64_t nowtime;
 282         int error = parse_number(buf, count, &nowtime);
 283         if (error)
 284                 return error;
 285
 286         power_on_time = nowtime; /* save the time */
 287
 288         rtc_time64_to_tm(nowtime, &tm);
 289
 290         error = rtas_call(rtas_function_token(RTAS_FN_SET_TIME_FOR_POWER_ON), 7, 1, NULL,
 291                           tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
 292                           tm.tm_hour, tm.tm_min, tm.tm_sec, 0 /* nano */);
 293         if (error)
 294                 printk(KERN_WARNING "error: setting poweron time returned: %s\n",
 295                                 ppc_rtas_process_error(error));
 296         return count;
 297 }
 298 /* ****************************************************************** */
 299 static int ppc_rtas_poweron_show(struct seq_file *m, void *v)
 300 {
 301         if (power_on_time == 0)
 302                 seq_printf(m, "Power on time not set\n");
 303         else
 304                 seq_printf(m, "%lu\n",power_on_time);
 305         return 0;
 306 }
 307
 308 /* ****************************************************************** */
 309 /* PROGRESS                                                           */
 310 /* ****************************************************************** */
 311 static ssize_t ppc_rtas_progress_write(struct file *file,
 312                 const char __user *buf, size_t count, loff_t *ppos)
 313 {
 314         unsigned long hex;
 315
 316         if (count >= MAX_LINELENGTH)
 317                 count = MAX_LINELENGTH -1;
 318         if (copy_from_user(progress_led, buf, count)) { /* save the string */
 319                 return -EFAULT;
 320         }
 321         progress_led[count] = 0;
 322
 323         /* Lets see if the user passed hexdigits */
 324         hex = simple_strtoul(progress_led, NULL, 10);
 325
 326         rtas_progress ((char *)progress_led, hex);
 327         return count;
 328
 329         /* clear the line */
 330         /* rtas_progress("                   ", 0xffff);*/
 331 }
 332 /* ****************************************************************** */
 333 static int ppc_rtas_progress_show(struct seq_file *m, void *v)
 334 {
 335         if (progress_led[0])
 336                 seq_printf(m, "%s\n", progress_led);
 337         return 0;
 338 }
 339
 340 /* ****************************************************************** */
 341 /* CLOCK                                                              */
 342 /* ****************************************************************** */
 343 static ssize_t ppc_rtas_clock_write(struct file *file,
 344                 const char __user *buf, size_t count, loff_t *ppos)
 345 {
 346         struct rtc_time tm;
 347         time64_t nowtime;
 348         int error = parse_number(buf, count, &nowtime);
 349         if (error)
 350                 return error;
 351
 352         rtc_time64_to_tm(nowtime, &tm);
 353         error = rtas_call(rtas_function_token(RTAS_FN_SET_TIME_OF_DAY), 7, 1, NULL,
 354                           tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
 355                           tm.tm_hour, tm.tm_min, tm.tm_sec, 0);
 356         if (error)
 357                 printk(KERN_WARNING "error: setting the clock returned: %s\n",
 358                                 ppc_rtas_process_error(error));
 359         return count;
 360 }
 361 /* ****************************************************************** */
 362 static int ppc_rtas_clock_show(struct seq_file *m, void *v)
 363 {
 364         int ret[8];
 365         int error = rtas_call(rtas_function_token(RTAS_FN_GET_TIME_OF_DAY), 0, 8, ret);
 366
 367         if (error) {
 368                 printk(KERN_WARNING "error: reading the clock returned: %s\n",
 369                                 ppc_rtas_process_error(error));
 370                 seq_printf(m, "0");
 371         } else {
 372                 unsigned int year, mon, day, hour, min, sec;
 373                 year = ret[0]; mon  = ret[1]; day  = ret[2];
 374                 hour = ret[3]; min  = ret[4]; sec  = ret[5];
 375                 seq_printf(m, "%lld\n",
 376                                 mktime64(year, mon, day, hour, min, sec));
 377         }
 378         return 0;
 379 }
 380
 381 /* ****************************************************************** */
 382 /* SENSOR STUFF                                                       */
 383 /* ****************************************************************** */
 384 static int ppc_rtas_sensors_show(struct seq_file *m, void *v)
 385 {
 386         int i,j;
 387         int state, error;
 388         int get_sensor_state = rtas_function_token(RTAS_FN_GET_SENSOR_STATE);
 389
 390         seq_printf(m, "RTAS (RunTime Abstraction Services) Sensor Information\n");
 391         seq_printf(m, "Sensor\t\tValue\t\tCondition\tLocation\n");
 392         seq_printf(m, "********************************************************\n");
 393
 394         if (ppc_rtas_find_all_sensors() != 0) {
 395                 seq_printf(m, "\nNo sensors are available\n");
 396                 return 0;
 397         }
 398
 399         for (i=0; i<sensors.quant; i++) {
 400                 struct individual_sensor *p = &sensors.sensor[i];
 401                 char rstr[64];
 402                 const char *loc;
 403                 int llen, offs;
 404
 405                 sprintf (rstr, SENSOR_PREFIX"%04d", p->token);
 406                 loc = of_get_property(rtas_node, rstr, &llen);
 407
 408                 /* A sensor may have multiple instances */
 409                 for (j = 0, offs = 0; j <= p->quant; j++) {
 410                         error = rtas_call(get_sensor_state, 2, 2, &state,
 411                                           p->token, j);
 412
 413                         ppc_rtas_process_sensor(m, p, state, error, loc);
 414                         seq_putc(m, '\n');
 415                         if (loc) {
 416                                 offs += strlen(loc) + 1;
 417                                 loc += strlen(loc) + 1;
 418                                 if (offs >= llen)
 419                                         loc = NULL;
 420                         }
 421                 }
 422         }
 423         return 0;
 424 }
 425
 426 /* ****************************************************************** */
 427
 428 static int ppc_rtas_find_all_sensors(void)
 429 {
 430         const unsigned int *utmp;
 431         int len, i;
 432
 433         utmp = of_get_property(rtas_node, "rtas-sensors", &len);
 434         if (utmp == NULL) {
 435                 printk (KERN_ERR "error: could not get rtas-sensors\n");
 436                 return 1;
 437         }
 438
 439         sensors.quant = len / 8;      /* int + int */
 440
 441         for (i=0; i<sensors.quant; i++) {
 442                 sensors.sensor[i].token = *utmp++;
 443                 sensors.sensor[i].quant = *utmp++;
 444         }
 445         return 0;
 446 }
 447
 448 /* ****************************************************************** */
 449 /*
 450  * Builds a string of what rtas returned
 451  */
 452 static char *ppc_rtas_process_error(int error)
 453 {
 454         switch (error) {
 455                 case SENSOR_CRITICAL_HIGH:
 456                         return "(critical high)";
 457                 case SENSOR_WARNING_HIGH:
 458                         return "(warning high)";
 459                 case SENSOR_NORMAL:
 460                         return "(normal)";
 461                 case SENSOR_WARNING_LOW:
 462                         return "(warning low)";
 463                 case SENSOR_CRITICAL_LOW:
 464                         return "(critical low)";
 465                 case SENSOR_SUCCESS:
 466                         return "(read ok)";
 467                 case SENSOR_HW_ERROR:
 468                         return "(hardware error)";
 469                 case SENSOR_BUSY:
 470                         return "(busy)";
 471                 case SENSOR_NOT_EXIST:
 472                         return "(non existent)";
 473                 case SENSOR_DR_ENTITY:
 474                         return "(dr entity removed)";
 475                 default:
 476                         return "(UNKNOWN)";
 477         }
 478 }
 479
 480 /* ****************************************************************** */
 481 /*
 482  * Builds a string out of what the sensor said
 483  */
 484
 485 static void ppc_rtas_process_sensor(struct seq_file *m,
 486         struct individual_sensor *s, int state, int error, const char *loc)
 487 {
 488         /* Defined return vales */
 489         const char * key_switch[]        = { "Off\t", "Normal\t", "Secure\t",
 490                                                 "Maintenance" };
 491         const char * enclosure_switch[]  = { "Closed", "Open" };
 492         const char * lid_status[]        = { " ", "Open", "Closed" };
 493         const char * power_source[]      = { "AC\t", "Battery",
 494                                                 "AC & Battery" };
 495         const char * battery_remaining[] = { "Very Low", "Low", "Mid", "High" };
 496         const char * epow_sensor[]       = {
 497                 "EPOW Reset", "Cooling warning", "Power warning",
 498                 "System shutdown", "System halt", "EPOW main enclosure",
 499                 "EPOW power off" };
 500         const char * battery_cyclestate[]  = { "None", "In progress",
 501                                                 "Requested" };
 502         const char * battery_charging[]    = { "Charging", "Discharging",
 503                                                 "No current flow" };
 504         const char * ibm_drconnector[]     = { "Empty", "Present", "Unusable",
 505                                                 "Exchange" };
 506
 507         int have_strings = 0;
 508         int num_states = 0;
 509         int temperature = 0;
 510         int unknown = 0;
 511
 512         /* What kind of sensor do we have here? */
 513
 514         switch (s->token) {
 515                 case KEY_SWITCH:
 516                         seq_printf(m, "Key switch:\t");
 517                         num_states = sizeof(key_switch) / sizeof(char *);
 518                         if (state < num_states) {
 519                                 seq_printf(m, "%s\t", key_switch[state]);
 520                                 have_strings = 1;
 521                         }
 522                         break;
 523                 case ENCLOSURE_SWITCH:
 524                         seq_printf(m, "Enclosure switch:\t");
 525                         num_states = sizeof(enclosure_switch) / sizeof(char *);
 526                         if (state < num_states) {
 527                                 seq_printf(m, "%s\t",
 528                                                 enclosure_switch[state]);
 529                                 have_strings = 1;
 530                         }
 531                         break;
 532                 case THERMAL_SENSOR:
 533                         seq_printf(m, "Temp. (C/F):\t");
 534                         temperature = 1;
 535                         break;
 536                 case LID_STATUS:
 537                         seq_printf(m, "Lid status:\t");
 538                         num_states = sizeof(lid_status) / sizeof(char *);
 539                         if (state < num_states) {
 540                                 seq_printf(m, "%s\t", lid_status[state]);
 541                                 have_strings = 1;
 542                         }
 543                         break;
 544                 case POWER_SOURCE:
 545                         seq_printf(m, "Power source:\t");
 546                         num_states = sizeof(power_source) / sizeof(char *);
 547                         if (state < num_states) {
 548                                 seq_printf(m, "%s\t",
 549                                                 power_source[state]);
 550                                 have_strings = 1;
 551                         }
 552                         break;
 553                 case BATTERY_VOLTAGE:
 554                         seq_printf(m, "Battery voltage:\t");
 555                         break;
 556                 case BATTERY_REMAINING:
 557                         seq_printf(m, "Battery remaining:\t");
 558                         num_states = sizeof(battery_remaining) / sizeof(char *);
 559                         if (state < num_states)
 560                         {
 561                                 seq_printf(m, "%s\t",
 562                                                 battery_remaining[state]);
 563                                 have_strings = 1;
 564                         }
 565                         break;
 566                 case BATTERY_PERCENTAGE:
 567                         seq_printf(m, "Battery percentage:\t");
 568                         break;
 569                 case EPOW_SENSOR:
 570                         seq_printf(m, "EPOW Sensor:\t");
 571                         num_states = sizeof(epow_sensor) / sizeof(char *);
 572                         if (state < num_states) {
 573                                 seq_printf(m, "%s\t", epow_sensor[state]);
 574                                 have_strings = 1;
 575                         }
 576                         break;
 577                 case BATTERY_CYCLESTATE:
 578                         seq_printf(m, "Battery cyclestate:\t");
 579                         num_states = sizeof(battery_cyclestate) /
 580                                         sizeof(char *);
 581                         if (state < num_states) {
 582                                 seq_printf(m, "%s\t",
 583                                                 battery_cyclestate[state]);
 584                                 have_strings = 1;
 585                         }
 586                         break;
 587                 case BATTERY_CHARGING:
 588                         seq_printf(m, "Battery Charging:\t");
 589                         num_states = sizeof(battery_charging) / sizeof(char *);
 590                         if (state < num_states) {
 591                                 seq_printf(m, "%s\t",
 592                                                 battery_charging[state]);
 593                                 have_strings = 1;
 594                         }
 595                         break;
 596                 case IBM_SURVEILLANCE:
 597                         seq_printf(m, "Surveillance:\t");
 598                         break;
 599                 case IBM_FANRPM:
 600                         seq_printf(m, "Fan (rpm):\t");
 601                         break;
 602                 case IBM_VOLTAGE:
 603                         seq_printf(m, "Voltage (mv):\t");
 604                         break;
 605                 case IBM_DRCONNECTOR:
 606                         seq_printf(m, "DR connector:\t");
 607                         num_states = sizeof(ibm_drconnector) / sizeof(char *);
 608                         if (state < num_states) {
 609                                 seq_printf(m, "%s\t",
 610                                                 ibm_drconnector[state]);
 611                                 have_strings = 1;
 612                         }
 613                         break;
 614                 case IBM_POWERSUPPLY:
 615                         seq_printf(m, "Powersupply:\t");
 616                         break;
 617                 default:
 618                         seq_printf(m,  "Unknown sensor (type %d), ignoring it\n",
 619                                         s->token);
 620                         unknown = 1;
 621                         have_strings = 1;
 622                         break;
 623         }
 624         if (have_strings == 0) {
 625                 if (temperature) {
 626                         seq_printf(m, "%4d /%4d\t", state, cel_to_fahr(state));
 627                 } else
 628                         seq_printf(m, "%10d\t", state);
 629         }
 630         if (unknown == 0) {
 631                 seq_printf(m, "%s\t", ppc_rtas_process_error(error));
 632                 get_location_code(m, s, loc);
 633         }
 634 }
 635
 636 /* ****************************************************************** */
 637
 638 static void check_location(struct seq_file *m, const char *c)
 639 {
 640         switch (c[0]) {
 641                 case LOC_PLANAR:
 642                         seq_printf(m, "Planar #%c", c[1]);
 643                         break;
 644                 case LOC_CPU:
 645                         seq_printf(m, "CPU #%c", c[1]);
 646                         break;
 647                 case LOC_FAN:
 648                         seq_printf(m, "Fan #%c", c[1]);
 649                         break;
 650                 case LOC_RACKMOUNTED:
 651                         seq_printf(m, "Rack #%c", c[1]);
 652                         break;
 653                 case LOC_VOLTAGE:
 654                         seq_printf(m, "Voltage #%c", c[1]);
 655                         break;
 656                 case LOC_LCD:
 657                         seq_printf(m, "LCD #%c", c[1]);
 658                         break;
 659                 case '.':
 660                         seq_printf(m, "- %c", c[1]);
 661                         break;
 662                 default:
 663                         seq_printf(m, "Unknown location");
 664                         break;
 665         }
 666 }
 667
 668
 669 /* ****************************************************************** */
 670 /*
 671  * Format:
 672  * ${LETTER}${NUMBER}[[-/]${LETTER}${NUMBER} [ ... ] ]
 673  * the '.' may be an abbreviation
 674  */
 675 static void check_location_string(struct seq_file *m, const char *c)
 676 {
 677         while (*c) {
 678                 if (isalpha(*c) || *c == '.')
 679                         check_location(m, c);
 680                 else if (*c == '/' || *c == '-')
 681                         seq_printf(m, " at ");
 682                 c++;
 683         }
 684 }
 685
 686
 687 /* ****************************************************************** */
 688
 689 static void get_location_code(struct seq_file *m, struct individual_sensor *s,
 690                 const char *loc)
 691 {
 692         if (!loc || !*loc) {
 693                 seq_printf(m, "---");/* does not have a location */
 694         } else {
 695                 check_location_string(m, loc);
 696         }
 697         seq_putc(m, ' ');
 698 }
 699 /* ****************************************************************** */
 700 /* INDICATORS - Tone Frequency                                        */
 701 /* ****************************************************************** */
 702 static ssize_t ppc_rtas_tone_freq_write(struct file *file,
 703                 const char __user *buf, size_t count, loff_t *ppos)
 704 {
 705         u64 freq;
 706         int error = parse_number(buf, count, &freq);
 707         if (error)
 708                 return error;
 709
 710         rtas_tone_frequency = freq; /* save it for later */
 711         error = rtas_call(rtas_function_token(RTAS_FN_SET_INDICATOR), 3, 1, NULL,
 712                           TONE_FREQUENCY, 0, freq);
 713         if (error)
 714                 printk(KERN_WARNING "error: setting tone frequency returned: %s\n",
 715                                 ppc_rtas_process_error(error));
 716         return count;
 717 }
 718 /* ****************************************************************** */
 719 static int ppc_rtas_tone_freq_show(struct seq_file *m, void *v)
 720 {
 721         seq_printf(m, "%lu\n", rtas_tone_frequency);
 722         return 0;
 723 }
 724 /* ****************************************************************** */
 725 /* INDICATORS - Tone Volume                                           */
 726 /* ****************************************************************** */
 727 static ssize_t ppc_rtas_tone_volume_write(struct file *file,
 728                 const char __user *buf, size_t count, loff_t *ppos)
 729 {
 730         u64 volume;
 731         int error = parse_number(buf, count, &volume);
 732         if (error)
 733                 return error;
 734
 735         if (volume > 100)
 736                 volume = 100;
 737
 738         rtas_tone_volume = volume; /* save it for later */
 739         error = rtas_call(rtas_function_token(RTAS_FN_SET_INDICATOR), 3, 1, NULL,
 740                           TONE_VOLUME, 0, volume);
 741         if (error)
 742                 printk(KERN_WARNING "error: setting tone volume returned: %s\n",
 743                                 ppc_rtas_process_error(error));
 744         return count;
 745 }
 746 /* ****************************************************************** */
 747 static int ppc_rtas_tone_volume_show(struct seq_file *m, void *v)
 748 {
 749         seq_printf(m, "%lu\n", rtas_tone_volume);
 750         return 0;
 751 }
 752
 753 /**
 754  * ppc_rtas_rmo_buf_show() - Describe RTAS-addressable region for user space.
 755  * @m: seq_file output target.
 756  * @v: Unused.
 757  *
 758  * Base + size description of a range of RTAS-addressable memory set
 759  * aside for user space to use as work area(s) for certain RTAS
 760  * functions. User space accesses this region via /dev/mem. Apart from
 761  * security policies, the kernel does not arbitrate or serialize
 762  * access to this region, and user space must ensure that concurrent
 763  * users do not interfere with each other.
 764  */
 765 static int ppc_rtas_rmo_buf_show(struct seq_file *m, void *v)
 766 {
 767         seq_printf(m, "%016lx %x\n", rtas_rmo_buf, RTAS_USER_REGION_SIZE);
 768         return 0;
 769 }