drivers/sbus/char/envctrl.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
envtrl_i2c_test_pin
envctrl_i2c_test_bb
envctrl_i2c_read_addr
envctrl_i2c_write_addr
envctrl_i2c_read_data
envctrl_i2c_write_data
envctrl_i2c_stop
envctrl_i2c_read_8591
envctrl_i2c_read_8574
envctrl_i2c_data_translate
envctrl_read_cpu_info
envctrl_read_noncpu_info
envctrl_i2c_fan_status
envctrl_i2c_globaladdr
envctrl_i2c_voltage_status
envctrl_read
envctrl_ioctl
envctrl_open
envctrl_release
envctrl_set_mon
envctrl_init_adc
envctrl_init_fanstat
envctrl_init_globaladdr
envctrl_init_voltage_status
envctrl_init_i2c_child
envctrl_get_i2c_child
envctrl_do_shutdown
kenvctrld
envctrl_probe
envctrl_remove
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* envctrl.c: Temperature and Fan monitoring on Machines providing it.
   3  *
   4  * Copyright (C) 1998  Eddie C. Dost  (ecd@skynet.be)
   5  * Copyright (C) 2000  Vinh Truong    (vinh.truong@eng.sun.com)
   6  * VT - The implementation is to support Sun Microelectronics (SME) platform
   7  *      environment monitoring.  SME platforms use pcf8584 as the i2c bus 
   8  *      controller to access pcf8591 (8-bit A/D and D/A converter) and 
   9  *      pcf8571 (256 x 8-bit static low-voltage RAM with I2C-bus interface).
  10  *      At board level, it follows SME Firmware I2C Specification. Reference:
  11  *      http://www-eu2.semiconductors.com/pip/PCF8584P
  12  *      http://www-eu2.semiconductors.com/pip/PCF8574AP
  13  *      http://www-eu2.semiconductors.com/pip/PCF8591P
  14  *
  15  * EB - Added support for CP1500 Global Address and PS/Voltage monitoring.
  16  *              Eric Brower <ebrower@usa.net>
  17  *
  18  * DB - Audit every copy_to_user in envctrl_read.
  19  *              Daniele Bellucci <bellucda@tiscali.it>
  20  */
  21 
  22 #include <linux/module.h>
  23 #include <linux/kthread.h>
  24 #include <linux/delay.h>
  25 #include <linux/ioport.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/kmod.h>
  28 #include <linux/reboot.h>
  29 #include <linux/slab.h>
  30 #include <linux/of.h>
  31 #include <linux/of_device.h>
  32 
  33 #include <linux/uaccess.h>
  34 #include <asm/envctrl.h>
  35 #include <asm/io.h>
  36 
  37 #define DRIVER_NAME     "envctrl"
  38 #define PFX             DRIVER_NAME ": "
  39 
  40 #define ENVCTRL_MINOR   162
  41 
  42 #define PCF8584_ADDRESS 0x55
  43 
  44 #define CONTROL_PIN     0x80
  45 #define CONTROL_ES0     0x40
  46 #define CONTROL_ES1     0x20
  47 #define CONTROL_ES2     0x10
  48 #define CONTROL_ENI     0x08
  49 #define CONTROL_STA     0x04
  50 #define CONTROL_STO     0x02
  51 #define CONTROL_ACK     0x01
  52 
  53 #define STATUS_PIN      0x80
  54 #define STATUS_STS      0x20
  55 #define STATUS_BER      0x10
  56 #define STATUS_LRB      0x08
  57 #define STATUS_AD0      0x08
  58 #define STATUS_AAB      0x04
  59 #define STATUS_LAB      0x02
  60 #define STATUS_BB       0x01
  61 
  62 /*
  63  * CLK Mode Register.
  64  */
  65 #define BUS_CLK_90      0x00
  66 #define BUS_CLK_45      0x01
  67 #define BUS_CLK_11      0x02
  68 #define BUS_CLK_1_5     0x03
  69 
  70 #define CLK_3           0x00
  71 #define CLK_4_43        0x10
  72 #define CLK_6           0x14
  73 #define CLK_8           0x18
  74 #define CLK_12          0x1c
  75 
  76 #define OBD_SEND_START  0xc5    /* value to generate I2c_bus START condition */
  77 #define OBD_SEND_STOP   0xc3    /* value to generate I2c_bus STOP condition */
  78 
  79 /* Monitor type of i2c child device.
  80  * Firmware definitions.
  81  */
  82 #define PCF8584_MAX_CHANNELS            8
  83 #define PCF8584_GLOBALADDR_TYPE                 6  /* global address monitor */
  84 #define PCF8584_FANSTAT_TYPE            3  /* fan status monitor */
  85 #define PCF8584_VOLTAGE_TYPE            2  /* voltage monitor    */
  86 #define PCF8584_TEMP_TYPE                       1  /* temperature monitor*/
  87 
  88 /* Monitor type of i2c child device.
  89  * Driver definitions.
  90  */
  91 #define ENVCTRL_NOMON                           0
  92 #define ENVCTRL_CPUTEMP_MON                     1    /* cpu temperature monitor */
  93 #define ENVCTRL_CPUVOLTAGE_MON          2    /* voltage monitor         */
  94 #define ENVCTRL_FANSTAT_MON             3    /* fan status monitor      */
  95 #define ENVCTRL_ETHERTEMP_MON           4    /* ethernet temperature */
  96                                              /* monitor                     */
  97 #define ENVCTRL_VOLTAGESTAT_MON         5    /* voltage status monitor  */
  98 #define ENVCTRL_MTHRBDTEMP_MON          6    /* motherboard temperature */
  99 #define ENVCTRL_SCSITEMP_MON            7    /* scsi temperature */
 100 #define ENVCTRL_GLOBALADDR_MON          8    /* global address */
 101 
 102 /* Child device type.
 103  * Driver definitions.
 104  */
 105 #define I2C_ADC                         0    /* pcf8591 */
 106 #define I2C_GPIO                        1    /* pcf8571 */
 107 
 108 /* Data read from child device may need to decode
 109  * through a data table and a scale.
 110  * Translation type as defined by firmware.
 111  */
 112 #define ENVCTRL_TRANSLATE_NO            0
 113 #define ENVCTRL_TRANSLATE_PARTIAL       1
 114 #define ENVCTRL_TRANSLATE_COMBINED      2
 115 #define ENVCTRL_TRANSLATE_FULL          3     /* table[data] */
 116 #define ENVCTRL_TRANSLATE_SCALE         4     /* table[data]/scale */
 117 
 118 /* Driver miscellaneous definitions. */
 119 #define ENVCTRL_MAX_CPU                 4
 120 #define CHANNEL_DESC_SZ                 256
 121 
 122 /* Mask values for combined GlobalAddress/PowerStatus node */
 123 #define ENVCTRL_GLOBALADDR_ADDR_MASK    0x1F
 124 #define ENVCTRL_GLOBALADDR_PSTAT_MASK   0x60
 125 
 126 /* Node 0x70 ignored on CompactPCI CP1400/1500 platforms 
 127  * (see envctrl_init_i2c_child)
 128  */
 129 #define ENVCTRL_CPCI_IGNORED_NODE               0x70
 130 
 131 #define PCF8584_DATA    0x00
 132 #define PCF8584_CSR     0x01
 133 
 134 /* Each child device can be monitored by up to PCF8584_MAX_CHANNELS.
 135  * Property of a port or channel as defined by the firmware.
 136  */
 137 struct pcf8584_channel {
 138         unsigned char chnl_no;
 139         unsigned char io_direction;
 140         unsigned char type;
 141         unsigned char last;
 142 };
 143 
 144 /* Each child device may have one or more tables of bytes to help decode
 145  * data. Table property as defined by the firmware.
 146  */ 
 147 struct pcf8584_tblprop {
 148         unsigned int type;
 149         unsigned int scale;  
 150         unsigned int offset; /* offset from the beginning of the table */
 151         unsigned int size;
 152 };
 153 
 154 /* i2c child */
 155 struct i2c_child_t {
 156         /* Either ADC or GPIO. */
 157         unsigned char i2ctype;
 158         unsigned long addr;    
 159         struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS];
 160 
 161         /* Channel info. */ 
 162         unsigned int total_chnls;       /* Number of monitor channels. */
 163         unsigned char fan_mask;         /* Byte mask for fan status channels. */
 164         unsigned char voltage_mask;     /* Byte mask for voltage status channels. */
 165         struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS];
 166 
 167         /* Properties of all monitor channels. */
 168         unsigned int total_tbls;        /* Number of monitor tables. */
 169         char *tables;                   /* Pointer to table(s). */
 170         char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */
 171         char mon_type[PCF8584_MAX_CHANNELS];
 172 };
 173 
 174 static void __iomem *i2c;
 175 static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2];
 176 static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
 177 static unsigned int warning_temperature = 0;
 178 static unsigned int shutdown_temperature = 0;
 179 static char read_cpu;
 180 
 181 /* Forward declarations. */
 182 static struct i2c_child_t *envctrl_get_i2c_child(unsigned char);
 183 
 184 /* Function Description: Test the PIN bit (Pending Interrupt Not) 
 185  *                       to test when serial transmission is completed .
 186  * Return : None.
 187  */
 188 static void envtrl_i2c_test_pin(void)
 189 {
 190         int limit = 1000000;
 191 
 192         while (--limit > 0) {
 193                 if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN)) 
 194                         break;
 195                 udelay(1);
 196         } 
 197 
 198         if (limit <= 0)
 199                 printk(KERN_INFO PFX "Pin status will not clear.\n");
 200 }
 201 
 202 /* Function Description: Test busy bit.
 203  * Return : None.
 204  */
 205 static void envctrl_i2c_test_bb(void)
 206 {
 207         int limit = 1000000;
 208 
 209         while (--limit > 0) {
 210                 /* Busy bit 0 means busy. */
 211                 if (readb(i2c + PCF8584_CSR) & STATUS_BB)
 212                         break;
 213                 udelay(1);
 214         } 
 215 
 216         if (limit <= 0)
 217                 printk(KERN_INFO PFX "Busy bit will not clear.\n");
 218 }
 219 
 220 /* Function Description: Send the address for a read access.
 221  * Return : 0 if not acknowledged, otherwise acknowledged.
 222  */
 223 static int envctrl_i2c_read_addr(unsigned char addr)
 224 {
 225         envctrl_i2c_test_bb();
 226 
 227         /* Load address. */
 228         writeb(addr + 1, i2c + PCF8584_DATA);
 229 
 230         envctrl_i2c_test_bb();
 231 
 232         writeb(OBD_SEND_START, i2c + PCF8584_CSR);
 233 
 234         /* Wait for PIN. */
 235         envtrl_i2c_test_pin();
 236 
 237         /* CSR 0 means acknowledged. */
 238         if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) {
 239                 return readb(i2c + PCF8584_DATA);
 240         } else {
 241                 writeb(OBD_SEND_STOP, i2c + PCF8584_CSR);
 242                 return 0;
 243         }
 244 }
 245 
 246 /* Function Description: Send the address for write mode.  
 247  * Return : None.
 248  */
 249 static void envctrl_i2c_write_addr(unsigned char addr)
 250 {
 251         envctrl_i2c_test_bb();
 252         writeb(addr, i2c + PCF8584_DATA);
 253 
 254         /* Generate Start condition. */
 255         writeb(OBD_SEND_START, i2c + PCF8584_CSR);
 256 }
 257 
 258 /* Function Description: Read 1 byte of data from addr 
 259  *                       set by envctrl_i2c_read_addr() 
 260  * Return : Data from address set by envctrl_i2c_read_addr().
 261  */
 262 static unsigned char envctrl_i2c_read_data(void)
 263 {
 264         envtrl_i2c_test_pin();
 265         writeb(CONTROL_ES0, i2c + PCF8584_CSR);  /* Send neg ack. */
 266         return readb(i2c + PCF8584_DATA);
 267 }
 268 
 269 /* Function Description: Instruct the device which port to read data from.  
 270  * Return : None.
 271  */
 272 static void envctrl_i2c_write_data(unsigned char port)
 273 {
 274         envtrl_i2c_test_pin();
 275         writeb(port, i2c + PCF8584_DATA);
 276 }
 277 
 278 /* Function Description: Generate Stop condition after last byte is sent.
 279  * Return : None.
 280  */
 281 static void envctrl_i2c_stop(void)
 282 {
 283         envtrl_i2c_test_pin();
 284         writeb(OBD_SEND_STOP, i2c + PCF8584_CSR);
 285 }
 286 
 287 /* Function Description: Read adc device.
 288  * Return : Data at address and port.
 289  */
 290 static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port)
 291 {
 292         /* Send address. */
 293         envctrl_i2c_write_addr(addr);
 294 
 295         /* Setup port to read. */
 296         envctrl_i2c_write_data(port);
 297         envctrl_i2c_stop();
 298 
 299         /* Read port. */
 300         envctrl_i2c_read_addr(addr);
 301 
 302         /* Do a single byte read and send stop. */
 303         envctrl_i2c_read_data();
 304         envctrl_i2c_stop();
 305 
 306         return readb(i2c + PCF8584_DATA);
 307 }
 308 
 309 /* Function Description: Read gpio device.
 310  * Return : Data at address.
 311  */
 312 static unsigned char envctrl_i2c_read_8574(unsigned char addr)
 313 {
 314         unsigned char rd;
 315 
 316         envctrl_i2c_read_addr(addr);
 317 
 318         /* Do a single byte read and send stop. */
 319         rd = envctrl_i2c_read_data();
 320         envctrl_i2c_stop();
 321         return rd;
 322 }
 323 
 324 /* Function Description: Decode data read from an adc device using firmware
 325  *                       table.
 326  * Return: Number of read bytes. Data is stored in bufdata in ascii format.
 327  */
 328 static int envctrl_i2c_data_translate(unsigned char data, int translate_type,
 329                                       int scale, char *tbl, char *bufdata)
 330 {
 331         int len = 0;
 332 
 333         switch (translate_type) {
 334         case ENVCTRL_TRANSLATE_NO:
 335                 /* No decode necessary. */
 336                 len = 1;
 337                 bufdata[0] = data;
 338                 break;
 339 
 340         case ENVCTRL_TRANSLATE_FULL:
 341                 /* Decode this way: data = table[data]. */
 342                 len = 1;
 343                 bufdata[0] = tbl[data];
 344                 break;
 345 
 346         case ENVCTRL_TRANSLATE_SCALE:
 347                 /* Decode this way: data = table[data]/scale */
 348                 sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale));
 349                 len = strlen(bufdata);
 350                 bufdata[len - 1] = bufdata[len - 2];
 351                 bufdata[len - 2] = '.';
 352                 break;
 353 
 354         default:
 355                 break;
 356         }
 357 
 358         return len;
 359 }
 360 
 361 /* Function Description: Read cpu-related data such as cpu temperature, voltage.
 362  * Return: Number of read bytes. Data is stored in bufdata in ascii format.
 363  */
 364 static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild,
 365                                  char mon_type, unsigned char *bufdata)
 366 {
 367         unsigned char data;
 368         int i;
 369         char *tbl, j = -1;
 370 
 371         /* Find the right monitor type and channel. */
 372         for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
 373                 if (pchild->mon_type[i] == mon_type) {
 374                         if (++j == cpu) {
 375                                 break;
 376                         }
 377                 }
 378         }
 379 
 380         if (j != cpu)
 381                 return 0;
 382 
 383         /* Read data from address and port. */
 384         data = envctrl_i2c_read_8591((unsigned char)pchild->addr,
 385                                      (unsigned char)pchild->chnl_array[i].chnl_no);
 386 
 387         /* Find decoding table. */
 388         tbl = pchild->tables + pchild->tblprop_array[i].offset;
 389 
 390         return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
 391                                           pchild->tblprop_array[i].scale,
 392                                           tbl, bufdata);
 393 }
 394 
 395 /* Function Description: Read noncpu-related data such as motherboard 
 396  *                       temperature.
 397  * Return: Number of read bytes. Data is stored in bufdata in ascii format.
 398  */
 399 static int envctrl_read_noncpu_info(struct i2c_child_t *pchild,
 400                                     char mon_type, unsigned char *bufdata)
 401 {
 402         unsigned char data;
 403         int i;
 404         char *tbl = NULL;
 405 
 406         for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
 407                 if (pchild->mon_type[i] == mon_type)
 408                         break;
 409         }
 410 
 411         if (i >= PCF8584_MAX_CHANNELS)
 412                 return 0;
 413 
 414         /* Read data from address and port. */
 415         data = envctrl_i2c_read_8591((unsigned char)pchild->addr,
 416                                      (unsigned char)pchild->chnl_array[i].chnl_no);
 417 
 418         /* Find decoding table. */
 419         tbl = pchild->tables + pchild->tblprop_array[i].offset;
 420 
 421         return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
 422                                           pchild->tblprop_array[i].scale,
 423                                           tbl, bufdata);
 424 }
 425 
 426 /* Function Description: Read fan status.
 427  * Return : Always 1 byte. Status stored in bufdata.
 428  */
 429 static int envctrl_i2c_fan_status(struct i2c_child_t *pchild,
 430                                   unsigned char data,
 431                                   char *bufdata)
 432 {
 433         unsigned char tmp, ret = 0;
 434         int i, j = 0;
 435 
 436         tmp = data & pchild->fan_mask;
 437 
 438         if (tmp == pchild->fan_mask) {
 439                 /* All bits are on. All fans are functioning. */
 440                 ret = ENVCTRL_ALL_FANS_GOOD;
 441         } else if (tmp == 0) {
 442                 /* No bits are on. No fans are functioning. */
 443                 ret = ENVCTRL_ALL_FANS_BAD;
 444         } else {
 445                 /* Go through all channels, mark 'on' the matched bits.
 446                  * Notice that fan_mask may have discontiguous bits but
 447                  * return mask are always contiguous. For example if we
 448                  * monitor 4 fans at channels 0,1,2,4, the return mask
 449                  * should be 00010000 if only fan at channel 4 is working.
 450                  */
 451                 for (i = 0; i < PCF8584_MAX_CHANNELS;i++) {
 452                         if (pchild->fan_mask & chnls_mask[i]) {
 453                                 if (!(chnls_mask[i] & tmp))
 454                                         ret |= chnls_mask[j];
 455 
 456                                 j++;
 457                         }
 458                 }
 459         }
 460 
 461         bufdata[0] = ret;
 462         return 1;
 463 }
 464 
 465 /* Function Description: Read global addressing line.
 466  * Return : Always 1 byte. Status stored in bufdata.
 467  */
 468 static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild,
 469                                   unsigned char data,
 470                                   char *bufdata)
 471 {
 472         /* Translatation table is not necessary, as global
 473          * addr is the integer value of the GA# bits.
 474          *
 475          * NOTE: MSB is documented as zero, but I see it as '1' always....
 476          *
 477          * -----------------------------------------------
 478          * | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 |
 479          * -----------------------------------------------
 480          * GA0 - GA4    integer value of Global Address (backplane slot#)
 481          * DEG                  0 = cPCI Power supply output is starting to degrade
 482          *                              1 = cPCI Power supply output is OK
 483          * FAL                  0 = cPCI Power supply has failed
 484          *                              1 = cPCI Power supply output is OK
 485          */
 486         bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK);
 487         return 1;
 488 }
 489 
 490 /* Function Description: Read standard voltage and power supply status.
 491  * Return : Always 1 byte. Status stored in bufdata.
 492  */
 493 static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild,
 494                                                 unsigned char data,
 495                                                 char *bufdata)
 496 {
 497         unsigned char tmp, ret = 0;
 498         int i, j = 0;
 499 
 500         tmp = data & pchild->voltage_mask;
 501 
 502         /* Two channels are used to monitor voltage and power supply. */
 503         if (tmp == pchild->voltage_mask) {
 504                 /* All bits are on. Voltage and power supply are okay. */
 505                 ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD;
 506         } else if (tmp == 0) {
 507                 /* All bits are off. Voltage and power supply are bad */
 508                 ret = ENVCTRL_VOLTAGE_POWERSUPPLY_BAD;
 509         } else {
 510                 /* Either voltage or power supply has problem. */
 511                 for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
 512                         if (pchild->voltage_mask & chnls_mask[i]) {
 513                                 j++;
 514 
 515                                 /* Break out when there is a mismatch. */
 516                                 if (!(chnls_mask[i] & tmp))
 517                                         break; 
 518                         }
 519                 }
 520 
 521                 /* Make a wish that hardware will always use the
 522                  * first channel for voltage and the second for
 523                  * power supply.
 524                  */
 525                 if (j == 1)
 526                         ret = ENVCTRL_VOLTAGE_BAD;
 527                 else
 528                         ret = ENVCTRL_POWERSUPPLY_BAD;
 529         }
 530 
 531         bufdata[0] = ret;
 532         return 1;
 533 }
 534 
 535 /* Function Description: Read a byte from /dev/envctrl. Mapped to user read().
 536  * Return: Number of read bytes. 0 for error.
 537  */
 538 static ssize_t
 539 envctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 540 {
 541         struct i2c_child_t *pchild;
 542         unsigned char data[10];
 543         int ret = 0;
 544 
 545         /* Get the type of read as decided in ioctl() call.
 546          * Find the appropriate i2c child.
 547          * Get the data and put back to the user buffer.
 548          */
 549 
 550         switch ((int)(long)file->private_data) {
 551         case ENVCTRL_RD_WARNING_TEMPERATURE:
 552                 if (warning_temperature == 0)
 553                         return 0;
 554 
 555                 data[0] = (unsigned char)(warning_temperature);
 556                 ret = 1;
 557                 if (copy_to_user(buf, data, ret))
 558                         ret = -EFAULT;
 559                 break;
 560 
 561         case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
 562                 if (shutdown_temperature == 0)
 563                         return 0;
 564 
 565                 data[0] = (unsigned char)(shutdown_temperature);
 566                 ret = 1;
 567                 if (copy_to_user(buf, data, ret))
 568                         ret = -EFAULT;
 569                 break;
 570 
 571         case ENVCTRL_RD_MTHRBD_TEMPERATURE:
 572                 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON)))
 573                         return 0;
 574                 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data);
 575                 if (copy_to_user(buf, data, ret))
 576                         ret = -EFAULT;
 577                 break;
 578 
 579         case ENVCTRL_RD_CPU_TEMPERATURE:
 580                 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON)))
 581                         return 0;
 582                 ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data);
 583 
 584                 /* Reset cpu to the default cpu0. */
 585                 if (copy_to_user(buf, data, ret))
 586                         ret = -EFAULT;
 587                 break;
 588 
 589         case ENVCTRL_RD_CPU_VOLTAGE:
 590                 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON)))
 591                         return 0;
 592                 ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data);
 593 
 594                 /* Reset cpu to the default cpu0. */
 595                 if (copy_to_user(buf, data, ret))
 596                         ret = -EFAULT;
 597                 break;
 598 
 599         case ENVCTRL_RD_SCSI_TEMPERATURE:
 600                 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON)))
 601                         return 0;
 602                 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data);
 603                 if (copy_to_user(buf, data, ret))
 604                         ret = -EFAULT;
 605                 break;
 606 
 607         case ENVCTRL_RD_ETHERNET_TEMPERATURE:
 608                 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON)))
 609                         return 0;
 610                 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data);
 611                 if (copy_to_user(buf, data, ret))
 612                         ret = -EFAULT;
 613                 break;
 614 
 615         case ENVCTRL_RD_FAN_STATUS:
 616                 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON)))
 617                         return 0;
 618                 data[0] = envctrl_i2c_read_8574(pchild->addr);
 619                 ret = envctrl_i2c_fan_status(pchild,data[0], data);
 620                 if (copy_to_user(buf, data, ret))
 621                         ret = -EFAULT;
 622                 break;
 623         
 624         case ENVCTRL_RD_GLOBALADDRESS:
 625                 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
 626                         return 0;
 627                 data[0] = envctrl_i2c_read_8574(pchild->addr);
 628                 ret = envctrl_i2c_globaladdr(pchild, data[0], data);
 629                 if (copy_to_user(buf, data, ret))
 630                         ret = -EFAULT;
 631                 break;
 632 
 633         case ENVCTRL_RD_VOLTAGE_STATUS:
 634                 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON)))
 635                         /* If voltage monitor not present, check for CPCI equivalent */
 636                         if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
 637                                 return 0;
 638                 data[0] = envctrl_i2c_read_8574(pchild->addr);
 639                 ret = envctrl_i2c_voltage_status(pchild, data[0], data);
 640                 if (copy_to_user(buf, data, ret))
 641                         ret = -EFAULT;
 642                 break;
 643 
 644         default:
 645                 break;
 646 
 647         }
 648 
 649         return ret;
 650 }
 651 
 652 /* Function Description: Command what to read.  Mapped to user ioctl().
 653  * Return: Gives 0 for implemented commands, -EINVAL otherwise.
 654  */
 655 static long
 656 envctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 657 {
 658         char __user *infobuf;
 659 
 660         switch (cmd) {
 661         case ENVCTRL_RD_WARNING_TEMPERATURE:
 662         case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
 663         case ENVCTRL_RD_MTHRBD_TEMPERATURE:
 664         case ENVCTRL_RD_FAN_STATUS:
 665         case ENVCTRL_RD_VOLTAGE_STATUS:
 666         case ENVCTRL_RD_ETHERNET_TEMPERATURE:
 667         case ENVCTRL_RD_SCSI_TEMPERATURE:
 668         case ENVCTRL_RD_GLOBALADDRESS:
 669                 file->private_data = (void *)(long)cmd;
 670                 break;
 671 
 672         case ENVCTRL_RD_CPU_TEMPERATURE:
 673         case ENVCTRL_RD_CPU_VOLTAGE:
 674                 /* Check to see if application passes in any cpu number,
 675                  * the default is cpu0.
 676                  */
 677                 infobuf = (char __user *) arg;
 678                 if (infobuf == NULL) {
 679                         read_cpu = 0;
 680                 }else {
 681                         get_user(read_cpu, infobuf);
 682                 }
 683 
 684                 /* Save the command for use when reading. */
 685                 file->private_data = (void *)(long)cmd;
 686                 break;
 687 
 688         default:
 689                 return -EINVAL;
 690         }
 691 
 692         return 0;
 693 }
 694 
 695 /* Function Description: open device. Mapped to user open().
 696  * Return: Always 0.
 697  */
 698 static int
 699 envctrl_open(struct inode *inode, struct file *file)
 700 {
 701         file->private_data = NULL;
 702         return 0;
 703 }
 704 
 705 /* Function Description: Open device. Mapped to user close().
 706  * Return: Always 0.
 707  */
 708 static int
 709 envctrl_release(struct inode *inode, struct file *file)
 710 {
 711         return 0;
 712 }
 713 
 714 static const struct file_operations envctrl_fops = {
 715         .owner =                THIS_MODULE,
 716         .read =                 envctrl_read,
 717         .unlocked_ioctl =       envctrl_ioctl,
 718 #ifdef CONFIG_COMPAT
 719         .compat_ioctl =         envctrl_ioctl,
 720 #endif
 721         .open =                 envctrl_open,
 722         .release =              envctrl_release,
 723         .llseek =               noop_llseek,
 724 };      
 725 
 726 static struct miscdevice envctrl_dev = {
 727         ENVCTRL_MINOR,
 728         "envctrl",
 729         &envctrl_fops
 730 };
 731 
 732 /* Function Description: Set monitor type based on firmware description.
 733  * Return: None.
 734  */
 735 static void envctrl_set_mon(struct i2c_child_t *pchild,
 736                             const char *chnl_desc,
 737                             int chnl_no)
 738 {
 739         /* Firmware only has temperature type.  It does not distinguish
 740          * different kinds of temperatures.  We use channel description
 741          * to disinguish them.
 742          */
 743         if (!(strcmp(chnl_desc,"temp,cpu")) ||
 744             !(strcmp(chnl_desc,"temp,cpu0")) ||
 745             !(strcmp(chnl_desc,"temp,cpu1")) ||
 746             !(strcmp(chnl_desc,"temp,cpu2")) ||
 747             !(strcmp(chnl_desc,"temp,cpu3")))
 748                 pchild->mon_type[chnl_no] = ENVCTRL_CPUTEMP_MON;
 749 
 750         if (!(strcmp(chnl_desc,"vddcore,cpu0")) ||
 751             !(strcmp(chnl_desc,"vddcore,cpu1")) ||
 752             !(strcmp(chnl_desc,"vddcore,cpu2")) ||
 753             !(strcmp(chnl_desc,"vddcore,cpu3")))
 754                 pchild->mon_type[chnl_no] = ENVCTRL_CPUVOLTAGE_MON;
 755 
 756         if (!(strcmp(chnl_desc,"temp,motherboard")))
 757                 pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON;
 758 
 759         if (!(strcmp(chnl_desc,"temp,scsi")))
 760                 pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON;
 761 
 762         if (!(strcmp(chnl_desc,"temp,ethernet")))
 763                 pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON;
 764 }
 765 
 766 /* Function Description: Initialize monitor channel with channel desc,
 767  *                       decoding tables, monitor type, optional properties.
 768  * Return: None.
 769  */
 770 static void envctrl_init_adc(struct i2c_child_t *pchild, struct device_node *dp)
 771 {
 772         int i = 0, len;
 773         const char *pos;
 774         const unsigned int *pval;
 775 
 776         /* Firmware describe channels into a stream separated by a '\0'. */
 777         pos = of_get_property(dp, "channels-description", &len);
 778 
 779         while (len > 0) {
 780                 int l = strlen(pos) + 1;
 781                 envctrl_set_mon(pchild, pos, i++);
 782                 len -= l;
 783                 pos += l;
 784         }
 785 
 786         /* Get optional properties. */
 787         pval = of_get_property(dp, "warning-temp", NULL);
 788         if (pval)
 789                 warning_temperature = *pval;
 790 
 791         pval = of_get_property(dp, "shutdown-temp", NULL);
 792         if (pval)
 793                 shutdown_temperature = *pval;
 794 }
 795 
 796 /* Function Description: Initialize child device monitoring fan status.
 797  * Return: None.
 798  */
 799 static void envctrl_init_fanstat(struct i2c_child_t *pchild)
 800 {
 801         int i;
 802 
 803         /* Go through all channels and set up the mask. */
 804         for (i = 0; i < pchild->total_chnls; i++)
 805                 pchild->fan_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no];
 806 
 807         /* We only need to know if this child has fan status monitored.
 808          * We don't care which channels since we have the mask already.
 809          */
 810         pchild->mon_type[0] = ENVCTRL_FANSTAT_MON;
 811 }
 812 
 813 /* Function Description: Initialize child device for global addressing line.
 814  * Return: None.
 815  */
 816 static void envctrl_init_globaladdr(struct i2c_child_t *pchild)
 817 {
 818         int i;
 819 
 820         /* Voltage/PowerSupply monitoring is piggybacked 
 821          * with Global Address on CompactPCI.  See comments
 822          * within envctrl_i2c_globaladdr for bit assignments.
 823          *
 824          * The mask is created here by assigning mask bits to each
 825          * bit position that represents PCF8584_VOLTAGE_TYPE data.
 826          * Channel numbers are not consecutive within the globaladdr
 827          * node (why?), so we use the actual counter value as chnls_mask
 828          * index instead of the chnl_array[x].chnl_no value.
 829          *
 830          * NOTE: This loop could be replaced with a constant representing
 831          * a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK).
 832          */
 833         for (i = 0; i < pchild->total_chnls; i++) {
 834                 if (PCF8584_VOLTAGE_TYPE == pchild->chnl_array[i].type) {
 835                         pchild->voltage_mask |= chnls_mask[i];
 836                 }
 837         }
 838 
 839         /* We only need to know if this child has global addressing 
 840          * line monitored.  We don't care which channels since we know 
 841          * the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK).
 842          */
 843         pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON;
 844 }
 845 
 846 /* Initialize child device monitoring voltage status. */
 847 static void envctrl_init_voltage_status(struct i2c_child_t *pchild)
 848 {
 849         int i;
 850 
 851         /* Go through all channels and set up the mask. */
 852         for (i = 0; i < pchild->total_chnls; i++)
 853                 pchild->voltage_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no];
 854 
 855         /* We only need to know if this child has voltage status monitored.
 856          * We don't care which channels since we have the mask already.
 857          */
 858         pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON;
 859 }
 860 
 861 /* Function Description: Initialize i2c child device.
 862  * Return: None.
 863  */
 864 static void envctrl_init_i2c_child(struct device_node *dp,
 865                                    struct i2c_child_t *pchild)
 866 {
 867         int len, i, tbls_size = 0;
 868         const void *pval;
 869 
 870         /* Get device address. */
 871         pval = of_get_property(dp, "reg", &len);
 872         memcpy(&pchild->addr, pval, len);
 873 
 874         /* Get tables property.  Read firmware temperature tables. */
 875         pval = of_get_property(dp, "translation", &len);
 876         if (pval && len > 0) {
 877                 memcpy(pchild->tblprop_array, pval, len);
 878                 pchild->total_tbls = len / sizeof(struct pcf8584_tblprop);
 879                 for (i = 0; i < pchild->total_tbls; i++) {
 880                         if ((pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset) > tbls_size) {
 881                                 tbls_size = pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset;
 882                         }
 883                 }
 884 
 885                 pchild->tables = kmalloc(tbls_size, GFP_KERNEL);
 886                 if (pchild->tables == NULL){
 887                         printk(KERN_ERR PFX "Failed to allocate table.\n");
 888                         return;
 889                 }
 890                 pval = of_get_property(dp, "tables", &len);
 891                 if (!pval || len <= 0) {
 892                         printk(KERN_ERR PFX "Failed to get table.\n");
 893                         return;
 894                 }
 895                 memcpy(pchild->tables, pval, len);
 896         }
 897 
 898         /* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04)
 899          * sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is
 900          * "For Factory Use Only."
 901          *
 902          * We ignore the node on these platforms by assigning the
 903          * 'NULL' monitor type.
 904          */
 905         if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) {
 906                 struct device_node *root_node;
 907                 int len;
 908 
 909                 root_node = of_find_node_by_path("/");
 910                 if (of_node_name_eq(root_node, "SUNW,UltraSPARC-IIi-cEngine")) {
 911                         for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) {
 912                                 pchild->mon_type[len] = ENVCTRL_NOMON;
 913                         }
 914                         of_node_put(root_node);
 915                         return;
 916                 }
 917                 of_node_put(root_node);
 918         }
 919 
 920         /* Get the monitor channels. */
 921         pval = of_get_property(dp, "channels-in-use", &len);
 922         memcpy(pchild->chnl_array, pval, len);
 923         pchild->total_chnls = len / sizeof(struct pcf8584_channel);
 924 
 925         for (i = 0; i < pchild->total_chnls; i++) {
 926                 switch (pchild->chnl_array[i].type) {
 927                 case PCF8584_TEMP_TYPE:
 928                         envctrl_init_adc(pchild, dp);
 929                         break;
 930 
 931                 case PCF8584_GLOBALADDR_TYPE:
 932                         envctrl_init_globaladdr(pchild);
 933                         i = pchild->total_chnls;
 934                         break;
 935 
 936                 case PCF8584_FANSTAT_TYPE:
 937                         envctrl_init_fanstat(pchild);
 938                         i = pchild->total_chnls;
 939                         break;
 940 
 941                 case PCF8584_VOLTAGE_TYPE:
 942                         if (pchild->i2ctype == I2C_ADC) {
 943                                 envctrl_init_adc(pchild,dp);
 944                         } else {
 945                                 envctrl_init_voltage_status(pchild);
 946                         }
 947                         i = pchild->total_chnls;
 948                         break;
 949 
 950                 default:
 951                         break;
 952                 }
 953         }
 954 }
 955 
 956 /* Function Description: Search the child device list for a device.
 957  * Return : The i2c child if found. NULL otherwise.
 958  */
 959 static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type)
 960 {
 961         int i, j;
 962 
 963         for (i = 0; i < ENVCTRL_MAX_CPU*2; i++) {
 964                 for (j = 0; j < PCF8584_MAX_CHANNELS; j++) {
 965                         if (i2c_childlist[i].mon_type[j] == mon_type) {
 966                                 return (struct i2c_child_t *)(&(i2c_childlist[i]));
 967                         }
 968                 }
 969         }
 970         return NULL;
 971 }
 972 
 973 static void envctrl_do_shutdown(void)
 974 {
 975         static int inprog = 0;
 976 
 977         if (inprog != 0)
 978                 return;
 979 
 980         inprog = 1;
 981         printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n");
 982         orderly_poweroff(true);
 983 }
 984 
 985 static struct task_struct *kenvctrld_task;
 986 
 987 static int kenvctrld(void *__unused)
 988 {
 989         int poll_interval;
 990         int whichcpu;
 991         char tempbuf[10];
 992         struct i2c_child_t *cputemp;
 993 
 994         if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) {
 995                 printk(KERN_ERR  PFX
 996                        "kenvctrld unable to monitor CPU temp-- exiting\n");
 997                 return -ENODEV;
 998         }
 999 
1000         poll_interval = 5000; /* TODO env_mon_interval */
1001 
1002         printk(KERN_INFO PFX "%s starting...\n", current->comm);
1003         for (;;) {
1004                 msleep_interruptible(poll_interval);
1005 
1006                 if (kthread_should_stop())
1007                         break;
1008                 
1009                 for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) {
1010                         if (0 < envctrl_read_cpu_info(whichcpu, cputemp,
1011                                                       ENVCTRL_CPUTEMP_MON,
1012                                                       tempbuf)) {
1013                                 if (tempbuf[0] >= shutdown_temperature) {
1014                                         printk(KERN_CRIT 
1015                                                 "%s: WARNING: CPU%i temperature %i C meets or exceeds "\
1016                                                 "shutdown threshold %i C\n", 
1017                                                 current->comm, whichcpu, 
1018                                                 tempbuf[0], shutdown_temperature);
1019                                         envctrl_do_shutdown();
1020                                 }
1021                         }
1022                 }
1023         }
1024         printk(KERN_INFO PFX "%s exiting...\n", current->comm);
1025         return 0;
1026 }
1027 
1028 static int envctrl_probe(struct platform_device *op)
1029 {
1030         struct device_node *dp;
1031         int index, err;
1032 
1033         if (i2c)
1034                 return -EINVAL;
1035 
1036         i2c = of_ioremap(&op->resource[0], 0, 0x2, DRIVER_NAME);
1037         if (!i2c)
1038                 return -ENOMEM;
1039 
1040         index = 0;
1041         dp = op->dev.of_node->child;
1042         while (dp) {
1043                 if (of_node_name_eq(dp, "gpio")) {
1044                         i2c_childlist[index].i2ctype = I2C_GPIO;
1045                         envctrl_init_i2c_child(dp, &(i2c_childlist[index++]));
1046                 } else if (of_node_name_eq(dp, "adc")) {
1047                         i2c_childlist[index].i2ctype = I2C_ADC;
1048                         envctrl_init_i2c_child(dp, &(i2c_childlist[index++]));
1049                 }
1050 
1051                 dp = dp->sibling;
1052         }
1053 
1054         /* Set device address. */
1055         writeb(CONTROL_PIN, i2c + PCF8584_CSR);
1056         writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA);
1057 
1058         /* Set system clock and SCL frequencies. */ 
1059         writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR);
1060         writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA);
1061 
1062         /* Enable serial interface. */
1063         writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR);
1064         udelay(200);
1065 
1066         /* Register the device as a minor miscellaneous device. */
1067         err = misc_register(&envctrl_dev);
1068         if (err) {
1069                 printk(KERN_ERR PFX "Unable to get misc minor %d\n",
1070                        envctrl_dev.minor);
1071                 goto out_iounmap;
1072         }
1073 
1074         /* Note above traversal routine post-incremented 'i' to accommodate 
1075          * a next child device, so we decrement before reverse-traversal of
1076          * child devices.
1077          */
1078         printk(KERN_INFO PFX "Initialized ");
1079         for (--index; index >= 0; --index) {
1080                 printk("[%s 0x%lx]%s", 
1081                         (I2C_ADC == i2c_childlist[index].i2ctype) ? "adc" : 
1082                         ((I2C_GPIO == i2c_childlist[index].i2ctype) ? "gpio" : "unknown"), 
1083                         i2c_childlist[index].addr, (0 == index) ? "\n" : " ");
1084         }
1085 
1086         kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld");
1087         if (IS_ERR(kenvctrld_task)) {
1088                 err = PTR_ERR(kenvctrld_task);
1089                 goto out_deregister;
1090         }
1091 
1092         return 0;
1093 
1094 out_deregister:
1095         misc_deregister(&envctrl_dev);
1096 out_iounmap:
1097         of_iounmap(&op->resource[0], i2c, 0x2);
1098         for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++)
1099                 kfree(i2c_childlist[index].tables);
1100 
1101         return err;
1102 }
1103 
1104 static int envctrl_remove(struct platform_device *op)
1105 {
1106         int index;
1107 
1108         kthread_stop(kenvctrld_task);
1109 
1110         of_iounmap(&op->resource[0], i2c, 0x2);
1111         misc_deregister(&envctrl_dev);
1112 
1113         for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++)
1114                 kfree(i2c_childlist[index].tables);
1115 
1116         return 0;
1117 }
1118 
1119 static const struct of_device_id envctrl_match[] = {
1120         {
1121                 .name = "i2c",
1122                 .compatible = "i2cpcf,8584",
1123         },
1124         {},
1125 };
1126 MODULE_DEVICE_TABLE(of, envctrl_match);
1127 
1128 static struct platform_driver envctrl_driver = {
1129         .driver = {
1130                 .name = DRIVER_NAME,
1131                 .of_match_table = envctrl_match,
1132         },
1133         .probe          = envctrl_probe,
1134         .remove         = envctrl_remove,
1135 };
1136 
1137 module_platform_driver(envctrl_driver);
1138 
1139 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/sbus/char/envctrl.c

DEFINITIONS
