drivers/hwmon/it87.c

   1 /*
   2     it87.c - Part of lm_sensors, Linux kernel modules for hardware
   3              monitoring.
   4
   5     The IT8705F is an LPC-based Super I/O part that contains UARTs, a
   6     parallel port, an IR port, a MIDI port, a floppy controller, etc., in
   7     addition to an Environment Controller (Enhanced Hardware Monitor and
   8     Fan Controller)
   9
  10     This driver supports only the Environment Controller in the IT8705F and
  11     similar parts.  The other devices are supported by different drivers.
  12
  13     Supports: IT8705F  Super I/O chip w/LPC interface
  14               IT8712F  Super I/O chip w/LPC interface
  15               IT8716F  Super I/O chip w/LPC interface
  16               IT8718F  Super I/O chip w/LPC interface
  17               IT8726F  Super I/O chip w/LPC interface
  18               Sis950   A clone of the IT8705F
  19
  20     Copyright (C) 2001 Chris Gauthron
  21     Copyright (C) 2005-2007 Jean Delvare <khali@linux-fr.org>
  22
  23     This program is free software; you can redistribute it and/or modify
  24     it under the terms of the GNU General Public License as published by
  25     the Free Software Foundation; either version 2 of the License, or
  26     (at your option) any later version.
  27
  28     This program is distributed in the hope that it will be useful,
  29     but WITHOUT ANY WARRANTY; without even the implied warranty of
  30     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  31     GNU General Public License for more details.
  32
  33     You should have received a copy of the GNU General Public License
  34     along with this program; if not, write to the Free Software
  35     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  36 */
  37
  38 #include <linux/module.h>
  39 #include <linux/init.h>
  40 #include <linux/slab.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/platform_device.h>
  43 #include <linux/hwmon.h>
  44 #include <linux/hwmon-sysfs.h>
  45 #include <linux/hwmon-vid.h>
  46 #include <linux/err.h>
  47 #include <linux/mutex.h>
  48 #include <linux/sysfs.h>
  49 #include <linux/string.h>
  50 #include <linux/dmi.h>
  51 #include <asm/io.h>
  52
  53 #define DRVNAME "it87"
  54
  55 enum chips { it87, it8712, it8716, it8718 };
  56
  57 static unsigned short force_id;
  58 module_param(force_id, ushort, 0);
  59 MODULE_PARM_DESC(force_id, "Override the detected device ID");
  60
  61 static struct platform_device *pdev;
  62
  63 #define REG     0x2e    /* The register to read/write */
  64 #define DEV     0x07    /* Register: Logical device select */
  65 #define VAL     0x2f    /* The value to read/write */
  66 #define PME     0x04    /* The device with the fan registers in it */
  67 #define GPIO    0x07    /* The device with the IT8718F VID value in it */
  68 #define DEVID   0x20    /* Register: Device ID */
  69 #define DEVREV  0x22    /* Register: Device Revision */
  70
  71 static inline int
  72 superio_inb(int reg)
  73 {
  74         outb(reg, REG);
  75         return inb(VAL);
  76 }
  77
  78 static int superio_inw(int reg)
  79 {
  80         int val;
  81         outb(reg++, REG);
  82         val = inb(VAL) << 8;
  83         outb(reg, REG);
  84         val |= inb(VAL);
  85         return val;
  86 }
  87
  88 static inline void
  89 superio_select(int ldn)
  90 {
  91         outb(DEV, REG);
  92         outb(ldn, VAL);
  93 }
  94
  95 static inline void
  96 superio_enter(void)
  97 {
  98         outb(0x87, REG);
  99         outb(0x01, REG);
 100         outb(0x55, REG);
 101         outb(0x55, REG);
 102 }
 103
 104 static inline void
 105 superio_exit(void)
 106 {
 107         outb(0x02, REG);
 108         outb(0x02, VAL);
 109 }
 110
 111 /* Logical device 4 registers */
 112 #define IT8712F_DEVID 0x8712
 113 #define IT8705F_DEVID 0x8705
 114 #define IT8716F_DEVID 0x8716
 115 #define IT8718F_DEVID 0x8718
 116 #define IT8726F_DEVID 0x8726
 117 #define IT87_ACT_REG  0x30
 118 #define IT87_BASE_REG 0x60
 119
 120 /* Logical device 7 registers (IT8712F and later) */
 121 #define IT87_SIO_PINX2_REG      0x2c    /* Pin selection */
 122 #define IT87_SIO_VID_REG        0xfc    /* VID value */
 123
 124 /* Update battery voltage after every reading if true */
 125 static int update_vbat;
 126
 127 /* Not all BIOSes properly configure the PWM registers */
 128 static int fix_pwm_polarity;
 129
 130 /* Many IT87 constants specified below */
 131
 132 /* Length of ISA address segment */
 133 #define IT87_EXTENT 8
 134
 135 /* Length of ISA address segment for Environmental Controller */
 136 #define IT87_EC_EXTENT 2
 137
 138 /* Offset of EC registers from ISA base address */
 139 #define IT87_EC_OFFSET 5
 140
 141 /* Where are the ISA address/data registers relative to the EC base address */
 142 #define IT87_ADDR_REG_OFFSET 0
 143 #define IT87_DATA_REG_OFFSET 1
 144
 145 /*----- The IT87 registers -----*/
 146
 147 #define IT87_REG_CONFIG        0x00
 148
 149 #define IT87_REG_ALARM1        0x01
 150 #define IT87_REG_ALARM2        0x02
 151 #define IT87_REG_ALARM3        0x03
 152
 153 /* The IT8718F has the VID value in a different register, in Super-I/O
 154    configuration space. */
 155 #define IT87_REG_VID           0x0a
 156 /* The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b
 157    for fan divisors. Later IT8712F revisions must use 16-bit tachometer
 158    mode. */
 159 #define IT87_REG_FAN_DIV       0x0b
 160 #define IT87_REG_FAN_16BIT     0x0c
 161
 162 /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
 163
 164 static const u8 IT87_REG_FAN[]          = { 0x0d, 0x0e, 0x0f, 0x80, 0x82 };
 165 static const u8 IT87_REG_FAN_MIN[]      = { 0x10, 0x11, 0x12, 0x84, 0x86 };
 166 static const u8 IT87_REG_FANX[]         = { 0x18, 0x19, 0x1a, 0x81, 0x83 };
 167 static const u8 IT87_REG_FANX_MIN[]     = { 0x1b, 0x1c, 0x1d, 0x85, 0x87 };
 168 #define IT87_REG_FAN_MAIN_CTRL 0x13
 169 #define IT87_REG_FAN_CTL       0x14
 170 #define IT87_REG_PWM(nr)       (0x15 + (nr))
 171
 172 #define IT87_REG_VIN(nr)       (0x20 + (nr))
 173 #define IT87_REG_TEMP(nr)      (0x29 + (nr))
 174
 175 #define IT87_REG_VIN_MAX(nr)   (0x30 + (nr) * 2)
 176 #define IT87_REG_VIN_MIN(nr)   (0x31 + (nr) * 2)
 177 #define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
 178 #define IT87_REG_TEMP_LOW(nr)  (0x41 + (nr) * 2)
 179
 180 #define IT87_REG_VIN_ENABLE    0x50
 181 #define IT87_REG_TEMP_ENABLE   0x51
 182
 183 #define IT87_REG_CHIPID        0x58
 184
 185 #define IN_TO_REG(val)  (SENSORS_LIMIT((((val) + 8)/16),0,255))
 186 #define IN_FROM_REG(val) ((val) * 16)
 187
 188 static inline u8 FAN_TO_REG(long rpm, int div)
 189 {
 190         if (rpm == 0)
 191                 return 255;
 192         rpm = SENSORS_LIMIT(rpm, 1, 1000000);
 193         return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
 194                              254);
 195 }
 196
 197 static inline u16 FAN16_TO_REG(long rpm)
 198 {
 199         if (rpm == 0)
 200                 return 0xffff;
 201         return SENSORS_LIMIT((1350000 + rpm) / (rpm * 2), 1, 0xfffe);
 202 }
 203
 204 #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
 205 /* The divider is fixed to 2 in 16-bit mode */
 206 #define FAN16_FROM_REG(val) ((val)==0?-1:(val)==0xffff?0:1350000/((val)*2))
 207
 208 #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
 209                                         ((val)+500)/1000),-128,127))
 210 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
 211
 212 #define PWM_TO_REG(val)   ((val) >> 1)
 213 #define PWM_FROM_REG(val) (((val)&0x7f) << 1)
 214
 215 static int DIV_TO_REG(int val)
 216 {
 217         int answer = 0;
 218         while (answer < 7 && (val >>= 1))
 219                 answer++;
 220         return answer;
 221 }
 222 #define DIV_FROM_REG(val) (1 << (val))
 223
 224 static const unsigned int pwm_freq[8] = {
 225         48000000 / 128,
 226         24000000 / 128,
 227         12000000 / 128,
 228         8000000 / 128,
 229         6000000 / 128,
 230         3000000 / 128,
 231         1500000 / 128,
 232         750000 / 128,
 233 };
 234
 235
 236 struct it87_sio_data {
 237         enum chips type;
 238         /* Values read from Super-I/O config space */
 239         u8 revision;
 240         u8 vid_value;
 241         /* Values set based on DMI strings */
 242         u8 skip_pwm;
 243 };
 244
 245 /* For each registered chip, we need to keep some data in memory.
 246    The structure is dynamically allocated. */
 247 struct it87_data {
 248         struct device *hwmon_dev;
 249         enum chips type;
 250         u8 revision;
 251
 252         unsigned short addr;
 253         const char *name;
 254         struct mutex update_lock;
 255         char valid;             /* !=0 if following fields are valid */
 256         unsigned long last_updated;     /* In jiffies */
 257
 258         u8 in[9];               /* Register value */
 259         u8 in_max[8];           /* Register value */
 260         u8 in_min[8];           /* Register value */
 261         u8 has_fan;             /* Bitfield, fans enabled */
 262         u16 fan[5];             /* Register values, possibly combined */
 263         u16 fan_min[5];         /* Register values, possibly combined */
 264         u8 temp[3];             /* Register value */
 265         u8 temp_high[3];        /* Register value */
 266         u8 temp_low[3];         /* Register value */
 267         u8 sensor;              /* Register value */
 268         u8 fan_div[3];          /* Register encoding, shifted right */
 269         u8 vid;                 /* Register encoding, combined */
 270         u8 vrm;
 271         u32 alarms;             /* Register encoding, combined */
 272         u8 fan_main_ctrl;       /* Register value */
 273         u8 fan_ctl;             /* Register value */
 274         u8 manual_pwm_ctl[3];   /* manual PWM value set by user */
 275 };
 276
 277 static inline int has_16bit_fans(const struct it87_data *data)
 278 {
 279         /* IT8705F Datasheet 0.4.1, 3h == Version G.
 280            IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J.
 281            These are the first revisions with 16bit tachometer support. */
 282         return (data->type == it87 && data->revision >= 0x03)
 283             || (data->type == it8712 && data->revision >= 0x08)
 284             || data->type == it8716
 285             || data->type == it8718;
 286 }
 287
 288 static int it87_probe(struct platform_device *pdev);
 289 static int __devexit it87_remove(struct platform_device *pdev);
 290
 291 static int it87_read_value(struct it87_data *data, u8 reg);
 292 static void it87_write_value(struct it87_data *data, u8 reg, u8 value);
 293 static struct it87_data *it87_update_device(struct device *dev);
 294 static int it87_check_pwm(struct device *dev);
 295 static void it87_init_device(struct platform_device *pdev);
 296
 297
 298 static struct platform_driver it87_driver = {
 299         .driver = {
 300                 .owner  = THIS_MODULE,
 301                 .name   = DRVNAME,
 302         },
 303         .probe  = it87_probe,
 304         .remove = __devexit_p(it87_remove),
 305 };
 306
 307 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 308                 char *buf)
 309 {
 310         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 311         int nr = sensor_attr->index;
 312
 313         struct it87_data *data = it87_update_device(dev);
 314         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
 315 }
 316
 317 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 318                 char *buf)
 319 {
 320         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 321         int nr = sensor_attr->index;
 322
 323         struct it87_data *data = it87_update_device(dev);
 324         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
 325 }
 326
 327 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 328                 char *buf)
 329 {
 330         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 331         int nr = sensor_attr->index;
 332
 333         struct it87_data *data = it87_update_device(dev);
 334         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
 335 }
 336
 337 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 338                 const char *buf, size_t count)
 339 {
 340         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 341         int nr = sensor_attr->index;
 342
 343         struct it87_data *data = dev_get_drvdata(dev);
 344         unsigned long val = simple_strtoul(buf, NULL, 10);
 345
 346         mutex_lock(&data->update_lock);
 347         data->in_min[nr] = IN_TO_REG(val);
 348         it87_write_value(data, IT87_REG_VIN_MIN(nr),
 349                         data->in_min[nr]);
 350         mutex_unlock(&data->update_lock);
 351         return count;
 352 }
 353 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 354                 const char *buf, size_t count)
 355 {
 356         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 357         int nr = sensor_attr->index;
 358
 359         struct it87_data *data = dev_get_drvdata(dev);
 360         unsigned long val = simple_strtoul(buf, NULL, 10);
 361
 362         mutex_lock(&data->update_lock);
 363         data->in_max[nr] = IN_TO_REG(val);
 364         it87_write_value(data, IT87_REG_VIN_MAX(nr),
 365                         data->in_max[nr]);
 366         mutex_unlock(&data->update_lock);
 367         return count;
 368 }
 369
 370 #define show_in_offset(offset)                                  \
 371 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 372                 show_in, NULL, offset);
 373
 374 #define limit_in_offset(offset)                                 \
 375 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 376                 show_in_min, set_in_min, offset);               \
 377 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 378                 show_in_max, set_in_max, offset);
 379
 380 show_in_offset(0);
 381 limit_in_offset(0);
 382 show_in_offset(1);
 383 limit_in_offset(1);
 384 show_in_offset(2);
 385 limit_in_offset(2);
 386 show_in_offset(3);
 387 limit_in_offset(3);
 388 show_in_offset(4);
 389 limit_in_offset(4);
 390 show_in_offset(5);
 391 limit_in_offset(5);
 392 show_in_offset(6);
 393 limit_in_offset(6);
 394 show_in_offset(7);
 395 limit_in_offset(7);
 396 show_in_offset(8);
 397
 398 /* 3 temperatures */
 399 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 400                 char *buf)
 401 {
 402         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 403         int nr = sensor_attr->index;
 404
 405         struct it87_data *data = it87_update_device(dev);
 406         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 407 }
 408 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 409                 char *buf)
 410 {
 411         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 412         int nr = sensor_attr->index;
 413
 414         struct it87_data *data = it87_update_device(dev);
 415         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
 416 }
 417 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 418                 char *buf)
 419 {
 420         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 421         int nr = sensor_attr->index;
 422
 423         struct it87_data *data = it87_update_device(dev);
 424         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
 425 }
 426 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 427                 const char *buf, size_t count)
 428 {
 429         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 430         int nr = sensor_attr->index;
 431
 432         struct it87_data *data = dev_get_drvdata(dev);
 433         int val = simple_strtol(buf, NULL, 10);
 434
 435         mutex_lock(&data->update_lock);
 436         data->temp_high[nr] = TEMP_TO_REG(val);
 437         it87_write_value(data, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
 438         mutex_unlock(&data->update_lock);
 439         return count;
 440 }
 441 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 442                 const char *buf, size_t count)
 443 {
 444         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 445         int nr = sensor_attr->index;
 446
 447         struct it87_data *data = dev_get_drvdata(dev);
 448         int val = simple_strtol(buf, NULL, 10);
 449
 450         mutex_lock(&data->update_lock);
 451         data->temp_low[nr] = TEMP_TO_REG(val);
 452         it87_write_value(data, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
 453         mutex_unlock(&data->update_lock);
 454         return count;
 455 }
 456 #define show_temp_offset(offset)                                        \
 457 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \
 458                 show_temp, NULL, offset - 1);                           \
 459 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
 460                 show_temp_max, set_temp_max, offset - 1);               \
 461 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
 462                 show_temp_min, set_temp_min, offset - 1);
 463
 464 show_temp_offset(1);
 465 show_temp_offset(2);
 466 show_temp_offset(3);
 467
 468 static ssize_t show_sensor(struct device *dev, struct device_attribute *attr,
 469                 char *buf)
 470 {
 471         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 472         int nr = sensor_attr->index;
 473
 474         struct it87_data *data = it87_update_device(dev);
 475         u8 reg = data->sensor; /* In case the value is updated while we use it */
 476
 477         if (reg & (1 << nr))
 478                 return sprintf(buf, "3\n");  /* thermal diode */
 479         if (reg & (8 << nr))
 480                 return sprintf(buf, "4\n");  /* thermistor */
 481         return sprintf(buf, "0\n");      /* disabled */
 482 }
 483 static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
 484                 const char *buf, size_t count)
 485 {
 486         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 487         int nr = sensor_attr->index;
 488
 489         struct it87_data *data = dev_get_drvdata(dev);
 490         int val = simple_strtol(buf, NULL, 10);
 491
 492         mutex_lock(&data->update_lock);
 493
 494         data->sensor &= ~(1 << nr);
 495         data->sensor &= ~(8 << nr);
 496         if (val == 2) { /* backwards compatibility */
 497                 dev_warn(dev, "Sensor type 2 is deprecated, please use 4 "
 498                          "instead\n");
 499                 val = 4;
 500         }
 501         /* 3 = thermal diode; 4 = thermistor; 0 = disabled */
 502         if (val == 3)
 503             data->sensor |= 1 << nr;
 504         else if (val == 4)
 505             data->sensor |= 8 << nr;
 506         else if (val != 0) {
 507                 mutex_unlock(&data->update_lock);
 508                 return -EINVAL;
 509         }
 510         it87_write_value(data, IT87_REG_TEMP_ENABLE, data->sensor);
 511         mutex_unlock(&data->update_lock);
 512         return count;
 513 }
 514 #define show_sensor_offset(offset)                                      \
 515 static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR,       \
 516                 show_sensor, set_sensor, offset - 1);
 517
 518 show_sensor_offset(1);
 519 show_sensor_offset(2);
 520 show_sensor_offset(3);
 521
 522 /* 3 Fans */
 523 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 524                 char *buf)
 525 {
 526         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 527         int nr = sensor_attr->index;
 528
 529         struct it87_data *data = it87_update_device(dev);
 530         return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr],
 531                                 DIV_FROM_REG(data->fan_div[nr])));
 532 }
 533 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 534                 char *buf)
 535 {
 536         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 537         int nr = sensor_attr->index;
 538
 539         struct it87_data *data = it87_update_device(dev);
 540         return sprintf(buf,"%d\n",
 541                 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])));
 542 }
 543 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 544                 char *buf)
 545 {
 546         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 547         int nr = sensor_attr->index;
 548
 549         struct it87_data *data = it87_update_device(dev);
 550         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 551 }
 552 static ssize_t show_pwm_enable(struct device *dev, struct device_attribute *attr,
 553                 char *buf)
 554 {
 555         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 556         int nr = sensor_attr->index;
 557
 558         struct it87_data *data = it87_update_device(dev);
 559         return sprintf(buf,"%d\n", (data->fan_main_ctrl & (1 << nr)) ? 1 : 0);
 560 }
 561 static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
 562                 char *buf)
 563 {
 564         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 565         int nr = sensor_attr->index;
 566
 567         struct it87_data *data = it87_update_device(dev);
 568         return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]);
 569 }
 570 static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr,
 571                 char *buf)
 572 {
 573         struct it87_data *data = it87_update_device(dev);
 574         int index = (data->fan_ctl >> 4) & 0x07;
 575
 576         return sprintf(buf, "%u\n", pwm_freq[index]);
 577 }
 578 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 579                 const char *buf, size_t count)
 580 {
 581         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 582         int nr = sensor_attr->index;
 583
 584         struct it87_data *data = dev_get_drvdata(dev);
 585         int val = simple_strtol(buf, NULL, 10);
 586         u8 reg;
 587
 588         mutex_lock(&data->update_lock);
 589         reg = it87_read_value(data, IT87_REG_FAN_DIV);
 590         switch (nr) {
 591         case 0: data->fan_div[nr] = reg & 0x07; break;
 592         case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break;
 593         case 2: data->fan_div[nr] = (reg & 0x40) ? 3 : 1; break;
 594         }
 595
 596         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 597         it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
 598         mutex_unlock(&data->update_lock);
 599         return count;
 600 }
 601 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 602                 const char *buf, size_t count)
 603 {
 604         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 605         int nr = sensor_attr->index;
 606
 607         struct it87_data *data = dev_get_drvdata(dev);
 608         unsigned long val = simple_strtoul(buf, NULL, 10);
 609         int min;
 610         u8 old;
 611
 612         mutex_lock(&data->update_lock);
 613         old = it87_read_value(data, IT87_REG_FAN_DIV);
 614
 615         /* Save fan min limit */
 616         min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
 617
 618         switch (nr) {
 619         case 0:
 620         case 1:
 621                 data->fan_div[nr] = DIV_TO_REG(val);
 622                 break;
 623         case 2:
 624                 if (val < 8)
 625                         data->fan_div[nr] = 1;
 626                 else
 627                         data->fan_div[nr] = 3;
 628         }
 629         val = old & 0x80;
 630         val |= (data->fan_div[0] & 0x07);
 631         val |= (data->fan_div[1] & 0x07) << 3;
 632         if (data->fan_div[2] == 3)
 633                 val |= 0x1 << 6;
 634         it87_write_value(data, IT87_REG_FAN_DIV, val);
 635
 636         /* Restore fan min limit */
 637         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 638         it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
 639
 640         mutex_unlock(&data->update_lock);
 641         return count;
 642 }
 643 static ssize_t set_pwm_enable(struct device *dev,
 644                 struct device_attribute *attr, const char *buf, size_t count)
 645 {
 646         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 647         int nr = sensor_attr->index;
 648
 649         struct it87_data *data = dev_get_drvdata(dev);
 650         int val = simple_strtol(buf, NULL, 10);
 651
 652         mutex_lock(&data->update_lock);
 653
 654         if (val == 0) {
 655                 int tmp;
 656                 /* make sure the fan is on when in on/off mode */
 657                 tmp = it87_read_value(data, IT87_REG_FAN_CTL);
 658                 it87_write_value(data, IT87_REG_FAN_CTL, tmp | (1 << nr));
 659                 /* set on/off mode */
 660                 data->fan_main_ctrl &= ~(1 << nr);
 661                 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
 662         } else if (val == 1) {
 663                 /* set SmartGuardian mode */
 664                 data->fan_main_ctrl |= (1 << nr);
 665                 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
 666                 /* set saved pwm value, clear FAN_CTLX PWM mode bit */
 667                 it87_write_value(data, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
 668         } else {
 669                 mutex_unlock(&data->update_lock);
 670                 return -EINVAL;
 671         }
 672
 673         mutex_unlock(&data->update_lock);
 674         return count;
 675 }
 676 static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
 677                 const char *buf, size_t count)
 678 {
 679         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 680         int nr = sensor_attr->index;
 681
 682         struct it87_data *data = dev_get_drvdata(dev);
 683         int val = simple_strtol(buf, NULL, 10);
 684
 685         if (val < 0 || val > 255)
 686                 return -EINVAL;
 687
 688         mutex_lock(&data->update_lock);
 689         data->manual_pwm_ctl[nr] = val;
 690         if (data->fan_main_ctrl & (1 << nr))
 691                 it87_write_value(data, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
 692         mutex_unlock(&data->update_lock);
 693         return count;
 694 }
 695 static ssize_t set_pwm_freq(struct device *dev,
 696                 struct device_attribute *attr, const char *buf, size_t count)
 697 {
 698         struct it87_data *data = dev_get_drvdata(dev);
 699         unsigned long val = simple_strtoul(buf, NULL, 10);
 700         int i;
 701
 702         /* Search for the nearest available frequency */
 703         for (i = 0; i < 7; i++) {
 704                 if (val > (pwm_freq[i] + pwm_freq[i+1]) / 2)
 705                         break;
 706         }
 707
 708         mutex_lock(&data->update_lock);
 709         data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL) & 0x8f;
 710         data->fan_ctl |= i << 4;
 711         it87_write_value(data, IT87_REG_FAN_CTL, data->fan_ctl);
 712         mutex_unlock(&data->update_lock);
 713
 714         return count;
 715 }
 716
 717 #define show_fan_offset(offset)                                 \
 718 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,         \
 719                 show_fan, NULL, offset - 1);                    \
 720 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 721                 show_fan_min, set_fan_min, offset - 1);         \
 722 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 723                 show_fan_div, set_fan_div, offset - 1);
 724
 725 show_fan_offset(1);
 726 show_fan_offset(2);
 727 show_fan_offset(3);
 728
 729 #define show_pwm_offset(offset)                                         \
 730 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,      \
 731                 show_pwm_enable, set_pwm_enable, offset - 1);           \
 732 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,               \
 733                 show_pwm, set_pwm, offset - 1);                         \
 734 static DEVICE_ATTR(pwm##offset##_freq,                                  \
 735                 (offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO),            \
 736                 show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));
 737
 738 show_pwm_offset(1);
 739 show_pwm_offset(2);
 740 show_pwm_offset(3);
 741
 742 /* A different set of callbacks for 16-bit fans */
 743 static ssize_t show_fan16(struct device *dev, struct device_attribute *attr,
 744                 char *buf)
 745 {
 746         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 747         int nr = sensor_attr->index;
 748         struct it87_data *data = it87_update_device(dev);
 749         return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan[nr]));
 750 }
 751
 752 static ssize_t show_fan16_min(struct device *dev, struct device_attribute *attr,
 753                 char *buf)
 754 {
 755         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 756         int nr = sensor_attr->index;
 757         struct it87_data *data = it87_update_device(dev);
 758         return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan_min[nr]));
 759 }
 760
 761 static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr,
 762                 const char *buf, size_t count)
 763 {
 764         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 765         int nr = sensor_attr->index;
 766         struct it87_data *data = dev_get_drvdata(dev);
 767         int val = simple_strtol(buf, NULL, 10);
 768
 769         mutex_lock(&data->update_lock);
 770         data->fan_min[nr] = FAN16_TO_REG(val);
 771         it87_write_value(data, IT87_REG_FAN_MIN[nr],
 772                          data->fan_min[nr] & 0xff);
 773         it87_write_value(data, IT87_REG_FANX_MIN[nr],
 774                          data->fan_min[nr] >> 8);
 775         mutex_unlock(&data->update_lock);
 776         return count;
 777 }
 778
 779 /* We want to use the same sysfs file names as 8-bit fans, but we need
 780    different variable names, so we have to use SENSOR_ATTR instead of
 781    SENSOR_DEVICE_ATTR. */
 782 #define show_fan16_offset(offset) \
 783 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \
 784         = SENSOR_ATTR(fan##offset##_input, S_IRUGO,             \
 785                 show_fan16, NULL, offset - 1);                  \
 786 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \
 787         = SENSOR_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,     \
 788                 show_fan16_min, set_fan16_min, offset - 1)
 789
 790 show_fan16_offset(1);
 791 show_fan16_offset(2);
 792 show_fan16_offset(3);
 793 show_fan16_offset(4);
 794 show_fan16_offset(5);
 795
 796 /* Alarms */
 797 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 798 {
 799         struct it87_data *data = it87_update_device(dev);
 800         return sprintf(buf, "%u\n", data->alarms);
 801 }
 802 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 803
 804 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 805                 char *buf)
 806 {
 807         int bitnr = to_sensor_dev_attr(attr)->index;
 808         struct it87_data *data = it87_update_device(dev);
 809         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 810 }
 811 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 8);
 812 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 9);
 813 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 10);
 814 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 11);
 815 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 12);
 816 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 13);
 817 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 14);
 818 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 15);
 819 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 0);
 820 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 1);
 821 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 2);
 822 static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 3);
 823 static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 6);
 824 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 16);
 825 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 17);
 826 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 18);
 827
 828 static ssize_t
 829 show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
 830 {
 831         struct it87_data *data = dev_get_drvdata(dev);
 832         return sprintf(buf, "%u\n", data->vrm);
 833 }
 834 static ssize_t
 835 store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 836 {
 837         struct it87_data *data = dev_get_drvdata(dev);
 838         u32 val;
 839
 840         val = simple_strtoul(buf, NULL, 10);
 841         data->vrm = val;
 842
 843         return count;
 844 }
 845 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
 846
 847 static ssize_t
 848 show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
 849 {
 850         struct it87_data *data = it87_update_device(dev);
 851         return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
 852 }
 853 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
 854
 855 static ssize_t show_name(struct device *dev, struct device_attribute
 856                          *devattr, char *buf)
 857 {
 858         struct it87_data *data = dev_get_drvdata(dev);
 859         return sprintf(buf, "%s\n", data->name);
 860 }
 861 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 862
 863 static struct attribute *it87_attributes[] = {
 864         &sensor_dev_attr_in0_input.dev_attr.attr,
 865         &sensor_dev_attr_in1_input.dev_attr.attr,
 866         &sensor_dev_attr_in2_input.dev_attr.attr,
 867         &sensor_dev_attr_in3_input.dev_attr.attr,
 868         &sensor_dev_attr_in4_input.dev_attr.attr,
 869         &sensor_dev_attr_in5_input.dev_attr.attr,
 870         &sensor_dev_attr_in6_input.dev_attr.attr,
 871         &sensor_dev_attr_in7_input.dev_attr.attr,
 872         &sensor_dev_attr_in8_input.dev_attr.attr,
 873         &sensor_dev_attr_in0_min.dev_attr.attr,
 874         &sensor_dev_attr_in1_min.dev_attr.attr,
 875         &sensor_dev_attr_in2_min.dev_attr.attr,
 876         &sensor_dev_attr_in3_min.dev_attr.attr,
 877         &sensor_dev_attr_in4_min.dev_attr.attr,
 878         &sensor_dev_attr_in5_min.dev_attr.attr,
 879         &sensor_dev_attr_in6_min.dev_attr.attr,
 880         &sensor_dev_attr_in7_min.dev_attr.attr,
 881         &sensor_dev_attr_in0_max.dev_attr.attr,
 882         &sensor_dev_attr_in1_max.dev_attr.attr,
 883         &sensor_dev_attr_in2_max.dev_attr.attr,
 884         &sensor_dev_attr_in3_max.dev_attr.attr,
 885         &sensor_dev_attr_in4_max.dev_attr.attr,
 886         &sensor_dev_attr_in5_max.dev_attr.attr,
 887         &sensor_dev_attr_in6_max.dev_attr.attr,
 888         &sensor_dev_attr_in7_max.dev_attr.attr,
 889         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 890         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 891         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 892         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 893         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 894         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 895         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 896         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 897
 898         &sensor_dev_attr_temp1_input.dev_attr.attr,
 899         &sensor_dev_attr_temp2_input.dev_attr.attr,
 900         &sensor_dev_attr_temp3_input.dev_attr.attr,
 901         &sensor_dev_attr_temp1_max.dev_attr.attr,
 902         &sensor_dev_attr_temp2_max.dev_attr.attr,
 903         &sensor_dev_attr_temp3_max.dev_attr.attr,
 904         &sensor_dev_attr_temp1_min.dev_attr.attr,
 905         &sensor_dev_attr_temp2_min.dev_attr.attr,
 906         &sensor_dev_attr_temp3_min.dev_attr.attr,
 907         &sensor_dev_attr_temp1_type.dev_attr.attr,
 908         &sensor_dev_attr_temp2_type.dev_attr.attr,
 909         &sensor_dev_attr_temp3_type.dev_attr.attr,
 910         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 911         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 912         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 913
 914         &dev_attr_alarms.attr,
 915         &dev_attr_name.attr,
 916         NULL
 917 };
 918
 919 static const struct attribute_group it87_group = {
 920         .attrs = it87_attributes,
 921 };
 922
 923 static struct attribute *it87_attributes_opt[] = {
 924         &sensor_dev_attr_fan1_input16.dev_attr.attr,
 925         &sensor_dev_attr_fan1_min16.dev_attr.attr,
 926         &sensor_dev_attr_fan2_input16.dev_attr.attr,
 927         &sensor_dev_attr_fan2_min16.dev_attr.attr,
 928         &sensor_dev_attr_fan3_input16.dev_attr.attr,
 929         &sensor_dev_attr_fan3_min16.dev_attr.attr,
 930         &sensor_dev_attr_fan4_input16.dev_attr.attr,
 931         &sensor_dev_attr_fan4_min16.dev_attr.attr,
 932         &sensor_dev_attr_fan5_input16.dev_attr.attr,
 933         &sensor_dev_attr_fan5_min16.dev_attr.attr,
 934
 935         &sensor_dev_attr_fan1_input.dev_attr.attr,
 936         &sensor_dev_attr_fan1_min.dev_attr.attr,
 937         &sensor_dev_attr_fan1_div.dev_attr.attr,
 938         &sensor_dev_attr_fan2_input.dev_attr.attr,
 939         &sensor_dev_attr_fan2_min.dev_attr.attr,
 940         &sensor_dev_attr_fan2_div.dev_attr.attr,
 941         &sensor_dev_attr_fan3_input.dev_attr.attr,
 942         &sensor_dev_attr_fan3_min.dev_attr.attr,
 943         &sensor_dev_attr_fan3_div.dev_attr.attr,
 944
 945         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 946         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 947         &sensor_dev_attr_fan3_alarm.dev_attr.attr,
 948         &sensor_dev_attr_fan4_alarm.dev_attr.attr,
 949         &sensor_dev_attr_fan5_alarm.dev_attr.attr,
 950
 951         &sensor_dev_attr_pwm1_enable.dev_attr.attr,
 952         &sensor_dev_attr_pwm2_enable.dev_attr.attr,
 953         &sensor_dev_attr_pwm3_enable.dev_attr.attr,
 954         &sensor_dev_attr_pwm1.dev_attr.attr,
 955         &sensor_dev_attr_pwm2.dev_attr.attr,
 956         &sensor_dev_attr_pwm3.dev_attr.attr,
 957         &dev_attr_pwm1_freq.attr,
 958         &dev_attr_pwm2_freq.attr,
 959         &dev_attr_pwm3_freq.attr,
 960
 961         &dev_attr_vrm.attr,
 962         &dev_attr_cpu0_vid.attr,
 963         NULL
 964 };
 965
 966 static const struct attribute_group it87_group_opt = {
 967         .attrs = it87_attributes_opt,
 968 };
 969
 970 /* SuperIO detection - will change isa_address if a chip is found */
 971 static int __init it87_find(unsigned short *address,
 972         struct it87_sio_data *sio_data)
 973 {
 974         int err = -ENODEV;
 975         u16 chip_type;
 976         const char *board_vendor, *board_name;
 977
 978         superio_enter();
 979         chip_type = force_id ? force_id : superio_inw(DEVID);
 980
 981         switch (chip_type) {
 982         case IT8705F_DEVID:
 983                 sio_data->type = it87;
 984                 break;
 985         case IT8712F_DEVID:
 986                 sio_data->type = it8712;
 987                 break;
 988         case IT8716F_DEVID:
 989         case IT8726F_DEVID:
 990                 sio_data->type = it8716;
 991                 break;
 992         case IT8718F_DEVID:
 993                 sio_data->type = it8718;
 994                 break;
 995         case 0xffff:    /* No device at all */
 996                 goto exit;
 997         default:
 998                 pr_debug(DRVNAME ": Unsupported chip (DEVID=0x%x)\n",
 999                          chip_type);
1000                 goto exit;
1001         }
1002
1003         superio_select(PME);
1004         if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
1005                 pr_info("it87: Device not activated, skipping\n");
1006                 goto exit;
1007         }
1008
1009         *address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
1010         if (*address == 0) {
1011                 pr_info("it87: Base address not set, skipping\n");
1012                 goto exit;
1013         }
1014
1015         err = 0;
1016         sio_data->revision = superio_inb(DEVREV) & 0x0f;
1017         pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
1018                 chip_type, *address, sio_data->revision);
1019
1020         /* Read GPIO config and VID value from LDN 7 (GPIO) */
1021         if (chip_type != IT8705F_DEVID) {
1022                 int reg;
1023
1024                 superio_select(GPIO);
1025                 if (chip_type == it8718)
1026                         sio_data->vid_value = superio_inb(IT87_SIO_VID_REG);
1027
1028                 reg = superio_inb(IT87_SIO_PINX2_REG);
1029                 if (reg & (1 << 0))
1030                         pr_info("it87: in3 is VCC (+5V)\n");
1031                 if (reg & (1 << 1))
1032                         pr_info("it87: in7 is VCCH (+5V Stand-By)\n");
1033         }
1034
1035         /* Disable specific features based on DMI strings */
1036         board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
1037         board_name = dmi_get_system_info(DMI_BOARD_NAME);
1038         if (board_vendor && board_name) {
1039                 if (strcmp(board_vendor, "nVIDIA") == 0
1040                  && strcmp(board_name, "FN68PT") == 0) {
1041                         /* On the Shuttle SN68PT, FAN_CTL2 is apparently not
1042                            connected to a fan, but to something else. One user
1043                            has reported instant system power-off when changing
1044                            the PWM2 duty cycle, so we disable it.
1045                            I use the board name string as the trigger in case
1046                            the same board is ever used in other systems. */
1047                         pr_info("it87: Disabling pwm2 due to "
1048                                 "hardware constraints\n");
1049                         sio_data->skip_pwm = (1 << 1);
1050                 }
1051         }
1052
1053 exit:
1054         superio_exit();
1055         return err;
1056 }
1057
1058 static int __devinit it87_probe(struct platform_device *pdev)
1059 {
1060         struct it87_data *data;
1061         struct resource *res;
1062         struct device *dev = &pdev->dev;
1063         struct it87_sio_data *sio_data = dev->platform_data;
1064         int err = 0;
1065         int enable_pwm_interface;
1066         static const char *names[] = {
1067                 "it87",
1068                 "it8712",
1069                 "it8716",
1070                 "it8718",
1071         };
1072
1073         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1074         if (!request_region(res->start, IT87_EC_EXTENT, DRVNAME)) {
1075                 dev_err(dev, "Failed to request region 0x%lx-0x%lx\n",
1076                         (unsigned long)res->start,
1077                         (unsigned long)(res->start + IT87_EC_EXTENT - 1));
1078                 err = -EBUSY;
1079                 goto ERROR0;
1080         }
1081
1082         if (!(data = kzalloc(sizeof(struct it87_data), GFP_KERNEL))) {
1083                 err = -ENOMEM;
1084                 goto ERROR1;
1085         }
1086
1087         data->addr = res->start;
1088         data->type = sio_data->type;
1089         data->revision = sio_data->revision;
1090         data->name = names[sio_data->type];
1091
1092         /* Now, we do the remaining detection. */
1093         if ((it87_read_value(data, IT87_REG_CONFIG) & 0x80)
1094          || it87_read_value(data, IT87_REG_CHIPID) != 0x90) {
1095                 err = -ENODEV;
1096                 goto ERROR2;
1097         }
1098
1099         platform_set_drvdata(pdev, data);
1100
1101         mutex_init(&data->update_lock);
1102
1103         /* Check PWM configuration */
1104         enable_pwm_interface = it87_check_pwm(dev);
1105
1106         /* Initialize the IT87 chip */
1107         it87_init_device(pdev);
1108
1109         /* Register sysfs hooks */
1110         if ((err = sysfs_create_group(&dev->kobj, &it87_group)))
1111                 goto ERROR2;
1112
1113         /* Do not create fan files for disabled fans */
1114         if (has_16bit_fans(data)) {
1115                 /* 16-bit tachometers */
1116                 if (data->has_fan & (1 << 0)) {
1117                         if ((err = device_create_file(dev,
1118                              &sensor_dev_attr_fan1_input16.dev_attr))
1119                          || (err = device_create_file(dev,
1120                              &sensor_dev_attr_fan1_min16.dev_attr))
1121                          || (err = device_create_file(dev,
1122                              &sensor_dev_attr_fan1_alarm.dev_attr)))
1123                                 goto ERROR4;
1124                 }
1125                 if (data->has_fan & (1 << 1)) {
1126                         if ((err = device_create_file(dev,
1127                              &sensor_dev_attr_fan2_input16.dev_attr))
1128                          || (err = device_create_file(dev,
1129                              &sensor_dev_attr_fan2_min16.dev_attr))
1130                          || (err = device_create_file(dev,
1131                              &sensor_dev_attr_fan2_alarm.dev_attr)))
1132                                 goto ERROR4;
1133                 }
1134                 if (data->has_fan & (1 << 2)) {
1135                         if ((err = device_create_file(dev,
1136                              &sensor_dev_attr_fan3_input16.dev_attr))
1137                          || (err = device_create_file(dev,
1138                              &sensor_dev_attr_fan3_min16.dev_attr))
1139                          || (err = device_create_file(dev,
1140                              &sensor_dev_attr_fan3_alarm.dev_attr)))
1141                                 goto ERROR4;
1142                 }
1143                 if (data->has_fan & (1 << 3)) {
1144                         if ((err = device_create_file(dev,
1145                              &sensor_dev_attr_fan4_input16.dev_attr))
1146                          || (err = device_create_file(dev,
1147                              &sensor_dev_attr_fan4_min16.dev_attr))
1148                          || (err = device_create_file(dev,
1149                              &sensor_dev_attr_fan4_alarm.dev_attr)))
1150                                 goto ERROR4;
1151                 }
1152                 if (data->has_fan & (1 << 4)) {
1153                         if ((err = device_create_file(dev,
1154                              &sensor_dev_attr_fan5_input16.dev_attr))
1155                          || (err = device_create_file(dev,
1156                              &sensor_dev_attr_fan5_min16.dev_attr))
1157                          || (err = device_create_file(dev,
1158                              &sensor_dev_attr_fan5_alarm.dev_attr)))
1159                                 goto ERROR4;
1160                 }
1161         } else {
1162                 /* 8-bit tachometers with clock divider */
1163                 if (data->has_fan & (1 << 0)) {
1164                         if ((err = device_create_file(dev,
1165                              &sensor_dev_attr_fan1_input.dev_attr))
1166                          || (err = device_create_file(dev,
1167                              &sensor_dev_attr_fan1_min.dev_attr))
1168                          || (err = device_create_file(dev,
1169                              &sensor_dev_attr_fan1_div.dev_attr))
1170                          || (err = device_create_file(dev,
1171                              &sensor_dev_attr_fan1_alarm.dev_attr)))
1172                                 goto ERROR4;
1173                 }
1174                 if (data->has_fan & (1 << 1)) {
1175                         if ((err = device_create_file(dev,
1176                              &sensor_dev_attr_fan2_input.dev_attr))
1177                          || (err = device_create_file(dev,
1178                              &sensor_dev_attr_fan2_min.dev_attr))
1179                          || (err = device_create_file(dev,
1180                              &sensor_dev_attr_fan2_div.dev_attr))
1181                          || (err = device_create_file(dev,
1182                              &sensor_dev_attr_fan2_alarm.dev_attr)))
1183                                 goto ERROR4;
1184                 }
1185                 if (data->has_fan & (1 << 2)) {
1186                         if ((err = device_create_file(dev,
1187                              &sensor_dev_attr_fan3_input.dev_attr))
1188                          || (err = device_create_file(dev,
1189                              &sensor_dev_attr_fan3_min.dev_attr))
1190                          || (err = device_create_file(dev,
1191                              &sensor_dev_attr_fan3_div.dev_attr))
1192                          || (err = device_create_file(dev,
1193                              &sensor_dev_attr_fan3_alarm.dev_attr)))
1194                                 goto ERROR4;
1195                 }
1196         }
1197
1198         if (enable_pwm_interface) {
1199                 if (!(sio_data->skip_pwm & (1 << 0))) {
1200                         if ((err = device_create_file(dev,
1201                              &sensor_dev_attr_pwm1_enable.dev_attr))
1202                          || (err = device_create_file(dev,
1203                              &sensor_dev_attr_pwm1.dev_attr))
1204                          || (err = device_create_file(dev,
1205                              &dev_attr_pwm1_freq)))
1206                                 goto ERROR4;
1207                 }
1208                 if (!(sio_data->skip_pwm & (1 << 1))) {
1209                         if ((err = device_create_file(dev,
1210                              &sensor_dev_attr_pwm2_enable.dev_attr))
1211                          || (err = device_create_file(dev,
1212                              &sensor_dev_attr_pwm2.dev_attr))
1213                          || (err = device_create_file(dev,
1214                              &dev_attr_pwm2_freq)))
1215                                 goto ERROR4;
1216                 }
1217                 if (!(sio_data->skip_pwm & (1 << 2))) {
1218                         if ((err = device_create_file(dev,
1219                              &sensor_dev_attr_pwm3_enable.dev_attr))
1220                          || (err = device_create_file(dev,
1221                              &sensor_dev_attr_pwm3.dev_attr))
1222                          || (err = device_create_file(dev,
1223                              &dev_attr_pwm3_freq)))
1224                                 goto ERROR4;
1225                 }
1226         }
1227
1228         if (data->type == it8712 || data->type == it8716
1229          || data->type == it8718) {
1230                 data->vrm = vid_which_vrm();
1231                 /* VID reading from Super-I/O config space if available */
1232                 data->vid = sio_data->vid_value;
1233                 if ((err = device_create_file(dev,
1234                      &dev_attr_vrm))
1235                  || (err = device_create_file(dev,
1236                      &dev_attr_cpu0_vid)))
1237                         goto ERROR4;
1238         }
1239
1240         data->hwmon_dev = hwmon_device_register(dev);
1241         if (IS_ERR(data->hwmon_dev)) {
1242                 err = PTR_ERR(data->hwmon_dev);
1243                 goto ERROR4;
1244         }
1245
1246         return 0;
1247
1248 ERROR4:
1249         sysfs_remove_group(&dev->kobj, &it87_group);
1250         sysfs_remove_group(&dev->kobj, &it87_group_opt);
1251 ERROR2:
1252         platform_set_drvdata(pdev, NULL);
1253         kfree(data);
1254 ERROR1:
1255         release_region(res->start, IT87_EC_EXTENT);
1256 ERROR0:
1257         return err;
1258 }
1259
1260 static int __devexit it87_remove(struct platform_device *pdev)
1261 {
1262         struct it87_data *data = platform_get_drvdata(pdev);
1263
1264         hwmon_device_unregister(data->hwmon_dev);
1265         sysfs_remove_group(&pdev->dev.kobj, &it87_group);
1266         sysfs_remove_group(&pdev->dev.kobj, &it87_group_opt);
1267
1268         release_region(data->addr, IT87_EC_EXTENT);
1269         platform_set_drvdata(pdev, NULL);
1270         kfree(data);
1271
1272         return 0;
1273 }
1274
1275 /* Must be called with data->update_lock held, except during initialization.
1276    We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1277    would slow down the IT87 access and should not be necessary. */
1278 static int it87_read_value(struct it87_data *data, u8 reg)
1279 {
1280         outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
1281         return inb_p(data->addr + IT87_DATA_REG_OFFSET);
1282 }
1283
1284 /* Must be called with data->update_lock held, except during initialization.
1285    We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1286    would slow down the IT87 access and should not be necessary. */
1287 static void it87_write_value(struct it87_data *data, u8 reg, u8 value)
1288 {
1289         outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
1290         outb_p(value, data->addr + IT87_DATA_REG_OFFSET);
1291 }
1292
1293 /* Return 1 if and only if the PWM interface is safe to use */
1294 static int __devinit it87_check_pwm(struct device *dev)
1295 {
1296         struct it87_data *data = dev_get_drvdata(dev);
1297         /* Some BIOSes fail to correctly configure the IT87 fans. All fans off
1298          * and polarity set to active low is sign that this is the case so we
1299          * disable pwm control to protect the user. */
1300         int tmp = it87_read_value(data, IT87_REG_FAN_CTL);
1301         if ((tmp & 0x87) == 0) {
1302                 if (fix_pwm_polarity) {
1303                         /* The user asks us to attempt a chip reconfiguration.
1304                          * This means switching to active high polarity and
1305                          * inverting all fan speed values. */
1306                         int i;
1307                         u8 pwm[3];
1308
1309                         for (i = 0; i < 3; i++)
1310                                 pwm[i] = it87_read_value(data,
1311                                                          IT87_REG_PWM(i));
1312
1313                         /* If any fan is in automatic pwm mode, the polarity
1314                          * might be correct, as suspicious as it seems, so we
1315                          * better don't change anything (but still disable the
1316                          * PWM interface). */
1317                         if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
1318                                 dev_info(dev, "Reconfiguring PWM to "
1319                                          "active high polarity\n");
1320                                 it87_write_value(data, IT87_REG_FAN_CTL,
1321                                                  tmp | 0x87);
1322                                 for (i = 0; i < 3; i++)
1323                                         it87_write_value(data,
1324                                                          IT87_REG_PWM(i),
1325                                                          0x7f & ~pwm[i]);
1326                                 return 1;
1327                         }
1328
1329                         dev_info(dev, "PWM configuration is "
1330                                  "too broken to be fixed\n");
1331                 }
1332
1333                 dev_info(dev, "Detected broken BIOS "
1334                          "defaults, disabling PWM interface\n");
1335                 return 0;
1336         } else if (fix_pwm_polarity) {
1337                 dev_info(dev, "PWM configuration looks "
1338                          "sane, won't touch\n");
1339         }
1340
1341         return 1;
1342 }
1343
1344 /* Called when we have found a new IT87. */
1345 static void __devinit it87_init_device(struct platform_device *pdev)
1346 {
1347         struct it87_data *data = platform_get_drvdata(pdev);
1348         int tmp, i;
1349
1350         /* initialize to sane defaults:
1351          * - if the chip is in manual pwm mode, this will be overwritten with
1352          *   the actual settings on the chip (so in this case, initialization
1353          *   is not needed)
1354          * - if in automatic or on/off mode, we could switch to manual mode,
1355          *   read the registers and set manual_pwm_ctl accordingly, but currently
1356          *   this is not implemented, so we initialize to something sane */
1357         for (i = 0; i < 3; i++) {
1358                 data->manual_pwm_ctl[i] = 0xff;
1359         }
1360
1361         /* Some chips seem to have default value 0xff for all limit
1362          * registers. For low voltage limits it makes no sense and triggers
1363          * alarms, so change to 0 instead. For high temperature limits, it
1364          * means -1 degree C, which surprisingly doesn't trigger an alarm,
1365          * but is still confusing, so change to 127 degrees C. */
1366         for (i = 0; i < 8; i++) {
1367                 tmp = it87_read_value(data, IT87_REG_VIN_MIN(i));
1368                 if (tmp == 0xff)
1369                         it87_write_value(data, IT87_REG_VIN_MIN(i), 0);
1370         }
1371         for (i = 0; i < 3; i++) {
1372                 tmp = it87_read_value(data, IT87_REG_TEMP_HIGH(i));
1373                 if (tmp == 0xff)
1374                         it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127);
1375         }
1376
1377         /* Check if temperature channnels are reset manually or by some reason */
1378         tmp = it87_read_value(data, IT87_REG_TEMP_ENABLE);
1379         if ((tmp & 0x3f) == 0) {
1380                 /* Temp1,Temp3=thermistor; Temp2=thermal diode */
1381                 tmp = (tmp & 0xc0) | 0x2a;
1382                 it87_write_value(data, IT87_REG_TEMP_ENABLE, tmp);
1383         }
1384         data->sensor = tmp;
1385
1386         /* Check if voltage monitors are reset manually or by some reason */
1387         tmp = it87_read_value(data, IT87_REG_VIN_ENABLE);
1388         if ((tmp & 0xff) == 0) {
1389                 /* Enable all voltage monitors */
1390                 it87_write_value(data, IT87_REG_VIN_ENABLE, 0xff);
1391         }
1392
1393         /* Check if tachometers are reset manually or by some reason */
1394         data->fan_main_ctrl = it87_read_value(data, IT87_REG_FAN_MAIN_CTRL);
1395         if ((data->fan_main_ctrl & 0x70) == 0) {
1396                 /* Enable all fan tachometers */
1397                 data->fan_main_ctrl |= 0x70;
1398                 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
1399         }
1400         data->has_fan = (data->fan_main_ctrl >> 4) & 0x07;
1401
1402         /* Set tachometers to 16-bit mode if needed */
1403         if (has_16bit_fans(data)) {
1404                 tmp = it87_read_value(data, IT87_REG_FAN_16BIT);
1405                 if (~tmp & 0x07 & data->has_fan) {
1406                         dev_dbg(&pdev->dev,
1407                                 "Setting fan1-3 to 16-bit mode\n");
1408                         it87_write_value(data, IT87_REG_FAN_16BIT,
1409                                          tmp | 0x07);
1410                 }
1411                 /* IT8705F only supports three fans. */
1412                 if (data->type != it87) {
1413                         if (tmp & (1 << 4))
1414                                 data->has_fan |= (1 << 3); /* fan4 enabled */
1415                         if (tmp & (1 << 5))
1416                                 data->has_fan |= (1 << 4); /* fan5 enabled */
1417                 }
1418         }
1419
1420         /* Set current fan mode registers and the default settings for the
1421          * other mode registers */
1422         for (i = 0; i < 3; i++) {
1423                 if (data->fan_main_ctrl & (1 << i)) {
1424                         /* pwm mode */
1425                         tmp = it87_read_value(data, IT87_REG_PWM(i));
1426                         if (tmp & 0x80) {
1427                                 /* automatic pwm - not yet implemented, but
1428                                  * leave the settings made by the BIOS alone
1429                                  * until a change is requested via the sysfs
1430                                  * interface */
1431                         } else {
1432                                 /* manual pwm */
1433                                 data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
1434                         }
1435                 }
1436         }
1437
1438         /* Start monitoring */
1439         it87_write_value(data, IT87_REG_CONFIG,
1440                          (it87_read_value(data, IT87_REG_CONFIG) & 0x36)
1441                          | (update_vbat ? 0x41 : 0x01));
1442 }
1443
1444 static struct it87_data *it87_update_device(struct device *dev)
1445 {
1446         struct it87_data *data = dev_get_drvdata(dev);
1447         int i;
1448
1449         mutex_lock(&data->update_lock);
1450
1451         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
1452             || !data->valid) {
1453
1454                 if (update_vbat) {
1455                         /* Cleared after each update, so reenable.  Value
1456                           returned by this read will be previous value */
1457                         it87_write_value(data, IT87_REG_CONFIG,
1458                            it87_read_value(data, IT87_REG_CONFIG) | 0x40);
1459                 }
1460                 for (i = 0; i <= 7; i++) {
1461                         data->in[i] =
1462                             it87_read_value(data, IT87_REG_VIN(i));
1463                         data->in_min[i] =
1464                             it87_read_value(data, IT87_REG_VIN_MIN(i));
1465                         data->in_max[i] =
1466                             it87_read_value(data, IT87_REG_VIN_MAX(i));
1467                 }
1468                 /* in8 (battery) has no limit registers */
1469                 data->in[8] =
1470                     it87_read_value(data, IT87_REG_VIN(8));
1471
1472                 for (i = 0; i < 5; i++) {
1473                         /* Skip disabled fans */
1474                         if (!(data->has_fan & (1 << i)))
1475                                 continue;
1476
1477                         data->fan_min[i] =
1478                             it87_read_value(data, IT87_REG_FAN_MIN[i]);
1479                         data->fan[i] = it87_read_value(data,
1480                                        IT87_REG_FAN[i]);
1481                         /* Add high byte if in 16-bit mode */
1482                         if (has_16bit_fans(data)) {
1483                                 data->fan[i] |= it87_read_value(data,
1484                                                 IT87_REG_FANX[i]) << 8;
1485                                 data->fan_min[i] |= it87_read_value(data,
1486                                                 IT87_REG_FANX_MIN[i]) << 8;
1487                         }
1488                 }
1489                 for (i = 0; i < 3; i++) {
1490                         data->temp[i] =
1491                             it87_read_value(data, IT87_REG_TEMP(i));
1492                         data->temp_high[i] =
1493                             it87_read_value(data, IT87_REG_TEMP_HIGH(i));
1494                         data->temp_low[i] =
1495                             it87_read_value(data, IT87_REG_TEMP_LOW(i));
1496                 }
1497
1498                 /* Newer chips don't have clock dividers */
1499                 if ((data->has_fan & 0x07) && !has_16bit_fans(data)) {
1500                         i = it87_read_value(data, IT87_REG_FAN_DIV);
1501                         data->fan_div[0] = i & 0x07;
1502                         data->fan_div[1] = (i >> 3) & 0x07;
1503                         data->fan_div[2] = (i & 0x40) ? 3 : 1;
1504                 }
1505
1506                 data->alarms =
1507                         it87_read_value(data, IT87_REG_ALARM1) |
1508                         (it87_read_value(data, IT87_REG_ALARM2) << 8) |
1509                         (it87_read_value(data, IT87_REG_ALARM3) << 16);
1510                 data->fan_main_ctrl = it87_read_value(data,
1511                                 IT87_REG_FAN_MAIN_CTRL);
1512                 data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL);
1513
1514                 data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE);
1515                 /* The 8705 does not have VID capability.
1516                    The 8718 does not use IT87_REG_VID for the same purpose. */
1517                 if (data->type == it8712 || data->type == it8716) {
1518                         data->vid = it87_read_value(data, IT87_REG_VID);
1519                         /* The older IT8712F revisions had only 5 VID pins,
1520                            but we assume it is always safe to read 6 bits. */
1521                         data->vid &= 0x3f;
1522                 }
1523                 data->last_updated = jiffies;
1524                 data->valid = 1;
1525         }
1526
1527         mutex_unlock(&data->update_lock);
1528
1529         return data;
1530 }
1531
1532 static int __init it87_device_add(unsigned short address,
1533                                   const struct it87_sio_data *sio_data)
1534 {
1535         struct resource res = {
1536                 .start  = address + IT87_EC_OFFSET,
1537                 .end    = address + IT87_EC_OFFSET + IT87_EC_EXTENT - 1,
1538                 .name   = DRVNAME,
1539                 .flags  = IORESOURCE_IO,
1540         };
1541         int err;
1542
1543         pdev = platform_device_alloc(DRVNAME, address);
1544         if (!pdev) {
1545                 err = -ENOMEM;
1546                 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
1547                 goto exit;
1548         }
1549
1550         err = platform_device_add_resources(pdev, &res, 1);
1551         if (err) {
1552                 printk(KERN_ERR DRVNAME ": Device resource addition failed "
1553                        "(%d)\n", err);
1554                 goto exit_device_put;
1555         }
1556
1557         err = platform_device_add_data(pdev, sio_data,
1558                                        sizeof(struct it87_sio_data));
1559         if (err) {
1560                 printk(KERN_ERR DRVNAME ": Platform data allocation failed\n");
1561                 goto exit_device_put;
1562         }
1563
1564         err = platform_device_add(pdev);
1565         if (err) {
1566                 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
1567                        err);
1568                 goto exit_device_put;
1569         }
1570
1571         return 0;
1572
1573 exit_device_put:
1574         platform_device_put(pdev);
1575 exit:
1576         return err;
1577 }
1578
1579 static int __init sm_it87_init(void)
1580 {
1581         int err;
1582         unsigned short isa_address=0;
1583         struct it87_sio_data sio_data;
1584
1585         memset(&sio_data, 0, sizeof(struct it87_sio_data));
1586         err = it87_find(&isa_address, &sio_data);
1587         if (err)
1588                 return err;
1589         err = platform_driver_register(&it87_driver);
1590         if (err)
1591                 return err;
1592
1593         err = it87_device_add(isa_address, &sio_data);
1594         if (err){
1595                 platform_driver_unregister(&it87_driver);
1596                 return err;
1597         }
1598
1599         return 0;
1600 }
1601
1602 static void __exit sm_it87_exit(void)
1603 {
1604         platform_device_unregister(pdev);
1605         platform_driver_unregister(&it87_driver);
1606 }
1607
1608
1609 MODULE_AUTHOR("Chris Gauthron, "
1610               "Jean Delvare <khali@linux-fr.org>");
1611 MODULE_DESCRIPTION("IT8705F/8712F/8716F/8718F/8726F, SiS950 driver");
1612 module_param(update_vbat, bool, 0);
1613 MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
1614 module_param(fix_pwm_polarity, bool, 0);
1615 MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
1616 MODULE_LICENSE("GPL");
1617
1618 module_init(sm_it87_init);
1619 module_exit(sm_it87_exit);